JP5380640B2 - Weighing device - Google Patents

Description

  The present invention relates to a container accommodated in a sealed case and a weighing device capable of measuring the weight of the contents accommodated in the container.

  In this type of conventional measuring device, the measuring instrument is arranged in a sealed case (for example, see Patent Documents 1 and 2).

JP 2005-345314 A (paragraph [0016], FIG. 1) JP 10-253236 A (paragraph [0013], FIG. 1)

  However, in the above-described conventional measuring device, when the temperature and pressure in the sealed case are significantly different from normal temperature or normal pressure, or when the sealed case is in a corrosive gas atmosphere, it is affected by those effects. There was a possibility that the operation of the measuring instrument would become unstable.

  The present invention has been made in view of the above circumstances, and is a weighing device capable of measuring the weight of a container disposed in a sealed case and its contents while ensuring the stability of operation of the weighing instrument. The purpose is to provide.

In order to achieve the above object, a measuring device according to the invention of claim 1 includes a sealed case having an internal space isolated from the outside on the inside, a measuring instrument provided on the outside of the sealed case, and a measuring instrument. Between the container and the container accommodated in the sealed case through a wall portion constituting the sealed case, and the weight of the entire container including the liquid, powder and other contained items contained in the container, With a magnetic coupling that can be transmitted to the measuring instrument and a fixed base that is fixed outside the sealed case and partially or entirely located above the sealed case, the container can be moved up and down from the ceiling wall of the sealed case The magnet coupling is fixed to the container and the outer magnet that is suspended from the fixed base and placed outside the ceiling wall. It consists of an inner magnet that is magnetically coupled to the outer magnet in a non-contact state with the ceiling wall in between, and transmits the weight of the entire container to the outer magnet, and the weighing instrument is placed between the outer magnet and the fixed base. This is characterized in that the change in the weight of the entire container applied to the outer magnet can be measured.

Here, the phrase “with the measuring instrument disposed between the outer magnet and the fixed base” in claim 1 means that the “measuring instrument” is disposed in the “space” “between the outer magnet and the fixed base”. This means that a “meter” is arranged “in the middle of the load transmission path” between “the outer magnet and the fixed base”.

According to a second aspect of the present invention, there is provided the weighing apparatus according to the first aspect , wherein the outer horizontal plate is suspended from the fixed base and is opposed to the upper side of the ceiling wall of the sealed case; An inner horizontal plate facing the outer horizontal plate with a wall in between, a measuring instrument is placed between the outer horizontal plate and the fixed base, and the inner magnet is attached to the container of the inner horizontal plate It is characterized in that it is fixed at a plurality of positions that are point-symmetric, and a plurality of outer magnets are fixed at positions facing the plurality of inner magnets in the vertical direction on the outer horizontal board, and are magnetically coupled to the inner magnets.

In this case, “disposing the measuring instrument between the outer horizontal plate and the fixed base” in claim 2 means that “the measuring device” is arranged in the “space” between “the outer horizontal plate and the fixed base”. This does not mean that the “meter” is placed “in the middle of the load transmission path” between “the outer horizontal plate and the fixed base”.

According to a third aspect of the present invention, in the weighing device according to the second aspect , a plurality of magnet rings in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction are coaxially stacked, and different magnetic poles in the axial direction are adjacent to each other. A cylindrical first coupling magnet in which the phases of the magnet rings are fixed so as to fit with each other, and a columnar shape or a cylindrical shape loosely fitted inside the first coupling magnet are formed in the circumferential direction. A second coupling magnet in which a plurality of magnet disks in which S magnetic poles and N magnetic poles are alternately arranged are stacked on the same axis, and the phases of the magnetic disks are fixed so that different magnetic poles are adjacent in the axial direction. And either one of the first coupling magnet and the second coupling magnet is an outer magnet and the other is an inner magnet. A magnet isolation cylindrical wall is formed by projecting a part of the ceiling wall of the case in a cylindrical shape with a tip toward the inside or the outside, and the second coupling magnet is loosely fitted inside the magnet isolation cylinder wall. In addition, the first coupling magnet is characterized by being loosely fitted to the outside of the magnet isolation cylinder wall.

[Invention of Claim 1]
According to the first aspect of the present invention, the weight of the entire container including the liquid, the granular material, and other contained items contained in the container is obtained by the magnetic coupling magnetically coupled through the wall portion constituting the sealed case. It can be transmitted to a measuring instrument arranged outside the sealed case. Accordingly, it is possible to ensure the stability of the operation of the measuring instrument and to measure the weight of the container and the contents accommodated in the sealed case.

Furthermore, the outer magnet and the inner magnet are magnetically coupled, so that the container is suspended from the ceiling wall in the sealed case, and the weight of the entire container including the contents is changed from the inner magnet fixed to the container to the outer magnet. Communicated. Then, by placing the measuring instrument between the outer magnet and the fixed base, the change in the weight of the entire container applied to the outer magnet, that is, the weight of the contents discharged from the container to the receiving part is measured. It becomes possible to do.

[Invention of claim 2 ]
According to invention of Claim 2 , the upper limit of the weight which can be measured can be enlarged by performing a magnetic connection with a some magnet coupling. Alternatively, the magnetic coupling force per magnet coupling can be kept small.

[Invention of claim 3 ]
According to invention of Claim 3 , each magnet disk which comprises the 2nd coupling magnet is arrange | positioned inside each magnet ring which comprises the 1st coupling magnet, and these are each magnetically coupled. By doing so, a change in the weight of the entire container can be transmitted between the first coupling magnet and the second coupling magnet, that is, between the outer magnet and the inner magnet.

  Further, since the second coupling magnet is loosely fitted inside the magnet isolation cylinder wall formed on the ceiling wall of the sealed case, and the first coupling magnet is loosely fitted outside the magnet isolation cylinder wall, Relative rotation between the outer horizontal plate and the inner horizontal plate can be prohibited. As a result, it is possible to prevent a situation in which the outer horizontal plate and the inner horizontal plate are rotated relative to each other so that the positions of the inner magnet and the outer magnet are laterally shifted and the magnetic coupling of the magnet coupling is eliminated.

1 is a front view of a weighing device according to a first embodiment of the present invention. Perspective view of weighing device viewed from above Side view of supply drum Cross-sectional perspective view of supply drum Top view of the supply rotating member housed in the supply drum Perspective view of supply rotation member Cross-sectional perspective view at the lower end of the supply drum Plan view of supply rotating member and screen plate The figure showing the state which the 1st turning leg part has broken the granular material arch The figure showing the state which the 1st and 2nd turning leg part has broken the granular material arch (A) Side sectional view of magnet coupling, (B) Side sectional view according to modification Top view of inner and outer magnets Front view of the weighing device according to the first reference example Side view of magnet coupling Side sectional view of rotation transmission linear motion magnet coupling according to the second embodiment Top view of inner magnet and outer magnet Side sectional view of magnet coupling according to second reference example Side sectional view of magnet coupling according to modification

[First Embodiment]
Hereinafter, the weighing device 100 according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the weighing device 100 includes a sealed case 400 having an internal space isolated from the outside, and a receiver 130 (corresponding to the “receiving portion” of the present invention) accommodated in the sealed case 400. ), For example, a supply device 10 for supplying powder particles and a measuring device 300 for measuring the weight of the powder particles discharged from the supply device 10 toward the receiver 130 are provided.

  The sealed case 400 has, for example, a box structure having a loading / unloading port 401 on one side surface thereof, and includes a door 402 that can close the loading / unloading port 401 and an intake / exhaust pipe 403. The intake / exhaust pipe 403 communicates with the inside and outside of the sealed case 400 and protrudes to the side, so that a pump or a gas supply source (not shown) can be connected. The internal space of the sealed case 400 can be sealed in an airtight state, prevents intrusion of gas and foreign matter from the outside, and the sealed case 400 has a special atmosphere (for example, a large atmosphere, a constant temperature / humidity state or different from the atmosphere). It is possible to maintain a predetermined pressure different from the atmospheric pressure or a gas atmosphere different from the atmosphere.

  A fixed base 310 is fixedly placed on the upper surface of the ceiling wall 408 (hereinafter referred to as “case ceiling wall 408”) of the sealed case 400. The fixed base 310 has a table shape in which a pair of side plates hang down from both side edges of the horizontal top plate 311 toward the case ceiling wall 408, and the measuring device 300 according to the present invention is formed on the top surface of the top plate 311. (For example, an electronic balance or a platform scale) is placed (see FIG. 2).

  A movable base 320 that can move up and down in a state of being separated from the case ceiling wall 408 is provided above the outside of the sealed case 400. The movable base 320 has a vertically long frame structure. Specifically, the movable base 320 connects the upper ends of the pair of side plates 321 and 321 extending in the vertical direction with the upper horizontal plate 322A extending in the horizontal direction, and the lower ends of the pair of side plates 321 and 321. The parts are connected by a lower horizontal plate 322B extending in the horizontal direction.

  The central portion in the horizontal direction of the upper horizontal plate 322A is placed on the weighing table 301 provided on the upper surface of the weighing device 300, and the pair of side plates 321 and 321 penetrates the top plate 311 in a non-contact manner ( (See FIG. 2) The upper surface of the case ceiling wall 408 has been reached. The lower horizontal plate 322 </ b> B faces the case ceiling wall 408 from above and is disposed in parallel with the case ceiling wall 408.

  The supply machine 10 is housed in the internal space of the sealed case 400 and suspended from the case ceiling wall 408, and more specifically, outside the sealed case 400, more specifically. And a motor 50 disposed vertically above the supply drum 11 with a case ceiling wall 408 interposed therebetween.

  The supply drum 11 can accommodate the granular material and can discharge downward. As shown in FIG. 3, the supply drum 11 includes a large-diameter cylindrical portion 12 and a small-diameter cylindrical portion 13, and an intermediate step wall 14 between the lower end portion of the large-diameter cylindrical portion 12 and the upper end portion of the small-diameter cylindrical portion 13. Are connected by The small-diameter cylindrical portion 13 protrudes vertically downward from the center of the intermediate stepped wall 14, and the powder particles accommodated in the large-diameter cylindrical portion 12 are discharged downward through the inside of the small-diameter cylindrical portion 13.

  The upper end of the large diameter cylindrical portion 12 is open and is closed by a large diameter cap 15. The large diameter cap 15 is screwed onto the outer peripheral surface of the upper end of the large diameter cylindrical portion 12.

  The large-diameter cap 15 is formed with a supply port 15A that is always open facing upward. The replenishing port 15A is provided unevenly at a position deviated from the center of the large-diameter cap 15, and the granular material can be received from a replenisher 200 described later via the replenishing port 15A.

  A center hole 15 </ b> B is formed through the center of the large-diameter cap 15. A bearing 16 is fitted in the center hole 15B so as not to rotate, and the in-container rotation shaft 20 is rotatably supported by the bearing 16. The bearing 16 is, for example, a “sliding bearing”, and has a cylindrical structure in which an axial center portion thereof is slidably contacted by the in-container rotation shaft 20, and a flange projecting laterally from the upper end portion is a center hole. It is locked to the opening edge of 15B. The bearing 16 is made of resin (specifically, PTFE resin) having a small frictional resistance on the entire surface or the sliding surface with the in-container rotation shaft 20. The bearing 16 may be a thrust bearing.

  A cylindrical screwing wall 15C stands on the upper surface of the large-diameter cap 15 from a side position of the center hole 15B. A male spiral is formed on the outer peripheral surface of the cylindrical screwing wall 15C, and a cylindrical joint 17 is screwed into the male spiral. The cylindrical joint 17 has a flat cylindrical structure with both ends open.

  Pins 17 </ b> P and 17 </ b> P are erected at positions that are 180 degrees apart from each other in the circumferential direction on the upper surface of the cylindrical joint 17. On the other hand, a pair of pin holes 408P and 408P are formed on the inner surface of the case ceiling wall 408 corresponding to the pins 17P and 17P. The pins 17P and the pin holes 408P are uneven in the vertical direction. Match. Accordingly, relative rotation and horizontal movement of the supply drum 11 with respect to the case ceiling wall 408 are prohibited in a state where the vertical movement of the supply drum 11 with respect to the case ceiling wall 408 is permitted. A pair of pins 17P, 17P and a pair of pin holes 408P, 408P are engaged with each other in a concave-convex manner so that a replenishment pipe 213 provided in a replenisher 200, which will be described later, and a replenishment port 15A of the large-diameter cap 15 are coaxial. Can be positioned on the line.

  The in-container rotation shaft 20 extends along the central axis of the large diameter cylindrical portion 12. The upper end portion of the in-container rotation shaft 20 passes through the large-diameter cap 15 and protrudes upward from the cylindrical joint 17. The lower end portion of the in-container rotation shaft 20 is supplied in the large-diameter tube portion 12. The rotating member 21 is fixed.

  In addition to the supply rotation member 21, an in-container disk 30 and an upper surface standby guide 31 are accommodated inside the large diameter cylindrical portion 12. The in-container disk 30 is disposed in the center of the lower end portion of the large diameter cylindrical portion 12 and is loosely fitted inside the large diameter cylindrical portion 12. That is, the container inner disk 30 is a flat disk having a diameter smaller than the inner diameter of the large-diameter cylindrical portion 12 and larger than the inner diameter of the small-diameter cylindrical portion 13, and above the intermediate step wall 14 and the supply rotating member 21. It is mounted horizontally at a slight distance. The in-container disk 30 is fixed to the in-container rotation shaft 20 and rotates integrally with the supply rotation member 21 in the large diameter cylindrical portion 12.

  The upper surface standby guide 31 scrapes the granular material deposited on the container inner disk 30 into an annular space 38 (see FIG. 3) formed between the container inner disk 30 and the side wall of the large-diameter cylindrical portion 12. It is provided for. The upper surface standby guide 31 has an L shape as a whole. That is, the vertical plate 31A hanging from the upper end wall of the large-diameter cap 15 toward the intermediate step wall 14, and the upper surface of the inner disc 30 extending from the lower end of the vertical plate 31A toward the center of the large-diameter cylindrical portion 12 It is comprised from the horizontal board 31B arrange | positioned adjacent to.

  As shown in FIG. 4, the horizontal plate 31 </ b> B is attached to the side surface of the in-container rotation shaft 20 so as to be attached to the horizontal plate 31 </ b> B with respect to the rotation direction of the in-container disc 30 (the direction of the solid arrow in FIG. 4). Is inclined, and the granular material on the inner disc 30 is guided by the horizontal plate 31B and pushed out toward the edge of the inner disc 30. The horizontal plate 31 </ b> B extends to a position adjacent to the side wall of the large diameter cylindrical portion 12, and causes the extruded powder particles to flow down from the annular space 38 onto the intermediate step wall 14. Furthermore, since the container disc 30 and the upper surface standby guide 31 cooperate to stir the powder in the large-diameter cylindrical portion 12, the granular material is hardened or clogged in the large-diameter cylindrical portion 12. Can be prevented.

  The granular material deposited on the intermediate step wall 14 forms a slope with a predetermined angle of repose between the outer edge of the inner disc 30 and the intermediate step wall 14 and stops. Thereby, in the state which the supply rotation member 21 stopped, a granular material is not supplied to the small diameter cylinder part 13 from the intermediate | middle step difference wall 14. FIG.

  When the supply rotating member 21 rotates, the portion of the inclined surface having the predetermined angle of repose is scraped off and sent into the small-diameter cylindrical portion 13 among the granular material deposited on the intermediate stepped wall 14.

  As shown in FIGS. 5 and 6, the supply rotating member 21 has cantilever-shaped powder collecting blades 23 and dusting blades 24 extending laterally from a central plate portion 25 through which the container rotation shaft 20 passes. The dust collection blades 23 and the dust distribution blades 24 rotate in a horizontal plane while being in sliding contact with the upper surface of the intermediate step wall 14.

  As shown in FIG. 5, the dust collection blade 23 has a bent structure in which a plurality of flat plates are connected so as to swell on the opposite side to the rotation direction of the supply rotation member 21 (the direction of the solid line arrow in FIG. 5). 24 extends straight from the central plate portion 25 toward the side wall of the large-diameter cylindrical portion 12 in a state inclined with respect to the rotation direction of the supply rotating member 21. Further, the dust collection blade 23 extends to a position where the tip thereof is adjacent to the side wall of the large-diameter cylindrical portion 12, and the dust collection blade 24 is shorter than that.

  When the supply rotating member 21 rotates, the granular material deposited on the intermediate step wall 14 is guided to the center side of the intermediate step wall 14 by the powder collecting blades 23 and is sent to the small diameter cylindrical portion 13. The granular material that has not entered the small diameter cylindrical portion 13 is pushed back to the outside of the intermediate stepped wall 14 by the dust wings 24 and is taken into the small diameter cylindrical portion 13 when the powder collection wings 23 pass next.

  An auxiliary guide wall 22 is formed at the root portion 25 </ b> A of the powder collection blade 23 in the central plate portion 25 of the supply rotation member 21. The auxiliary guide wall 22 is obliquely cut and raised from the central plate portion 25, and is inclined so as to gradually descend toward the direction in which the granular material is guided by the powder collection blades 23 (the direction of the dotted arrow in FIG. 5). Yes. Then, the granular material that has been guided by the powder collection blades 23 and has reached the base end portion thereof is forcibly dropped to the small diameter cylindrical portion 13 by the auxiliary guide wall 22.

  As shown in FIG. 3, a screen plate 33 is detachably attached to the lower end portion of the small diameter cylindrical portion 13 in the supply drum 11. As shown in FIGS. 7 and 8, the screen plate 33 has a structure in which a plurality of slits 33 </ b> A extending in a direction intersecting the turning direction of the supply rotation member 21 are formed through a thin circular plate. Specifically, each slit 33 </ b> A is curved and extends toward the rear in the rotation direction of the supply rotation member 21 (in the direction of the solid line arrow in FIG. 8) as it goes outward from the center of the screen plate 33.

  Each of the slits 33A is closed by a powder arch formed by adhering (crosslinking) the powder particles fed into the small-diameter cylindrical portion 13, and the powder arch is in a collapsed state. The body can pass through. Although not shown, a plurality of types of screen plates 33 having different shapes of the slits 33 </ b> A are prepared, and the screen plate 33 suitable for the granular material is arbitrarily selected and attached before using the measuring device 100. Can be done. Instead of the screen plate 33 having the slits 33A, a punching metal, an expanded metal or a woven net having a large number of holes may be used.

  As shown in FIG. 3, the screen plate 33 is fixed to the lower end portion of the small-diameter cylindrical portion 13 by a support nut 34 screwed to the outer peripheral surface of the small-diameter cylindrical portion 13. As shown in FIG. 7, the support nut 34 has a structure in which a flange wall 34B projects from the lower end portion of the threaded tube portion 34A screwed to the small diameter tube portion 13 toward the center. The outer edge portion of the screen plate 33 is sandwiched in the plate thickness direction between the step portion 13A formed on the inner peripheral edge at the lower end of the tube portion 13. Further, a bottomed discharge port cap 35 can be screwed onto the outer peripheral surface of the support nut 34, and the lower side of the screen plate 33 (the lower end opening of the small-diameter cylindrical portion 13) can be sealed by the discharge port cap 35. It has become.

  As shown in FIG. 6, the supply rotating member 21 includes first to third swivel legs 26, 27, 28 extending downward from the central plate 25 in addition to the dust collection blades 23 and the dusting feathers 24. Are provided integrally. As shown in FIG. 3, the first to third swivel legs 26, 27, and 28 are all capable of swiveling inside the small diameter cylindrical portion 13.

  As shown in FIG. 6, the first swivel legs 26 are paired and are provided side by side with a space therebetween. The 1st turning leg part 26 is extended from the base part 25B of the dust blade 24 among the center board parts 25, and has comprised the mutually parallel strip | belt plate shape. The second swivel leg portion 27 extends from the base portion 25A of the powder collection blade 23 in the central plate portion 25, and the width seen from the front in the swivel direction is wider than that of the first swivel leg portion 26. It has a strip shape (see FIG. 3). These first and second swivel legs 26 and 27 are provided at positions separated from each other by 180 degrees, and as shown in FIGS. It extends diagonally to head toward. In addition, although the inclination of the 1st and 2nd turning leg parts 26 and 27 is about 30 degree | times with respect to a perpendicular direction, you may change according to a granular material characteristic.

  As shown in FIG. 6, the third swiveling leg portion 28 hangs down from the base portion 25 </ b> B of the dust wing 24 in the central plate portion 25, and has a strip plate shape having substantially the same width as the first swiveling leg portion 26. I am doing.

  As shown in FIG. 9, the first swivel leg 26 and the second swivel leg 27 have different lengths. When the supply rotation member 21 rotates, the lower end portion of the first swivel leg portion 26 swirls in the vicinity of the upper surface of the screen plate 33 (a grazing that does not contact the upper surface of the screen plate 33). On the other hand, the lower end portion of the second turning leg portion 27 turns the upper portion of the screen plate 33 from the lower end portion of the first turning leg portion 26. When the first and second swivel legs 26 and 27 swivel above the screen plate 33, the powder arch that closes the slit 33A of the screen plate 33 is collapsed, and the powder granule is released from the slit 33A. Discharged. Similarly to the first swivel leg 26, the lower end of the third swivel leg 28 swirls in the vicinity of the upper surface of the screen plate 33, collapses the powder arch, and discharges the powder from the slit 33A.

  For example, when the rotation speed of the supply rotating member 21 is relatively low, the pressing force accompanying the movement of the second swivel leg 27 does not propagate to the granular arch, and the first swivel leg 26 and the first swivel leg 26 Only the 3 swivel legs 28 break the granular material arch (the state shown in FIG. 9).

  On the other hand, when the rotational speed of the supply rotation member 21 is relatively high, the pressing force of the second swivel leg 27 propagates to the granular arch, and the granular arch is destroyed. That is, both the 1st and 2nd turning leg parts 26 and 27 and the 3rd turning leg part 28 destroy a granular material arch (state of FIG. 10).

  Thus, by increasing the rotation speed of the supply rotation member 21, the discharge amount per rotation of the supply rotation member 21 can be increased. Further, by increasing the rotation speed of the supply rotation member 21, the discharge amount per unit time can be increased rapidly.

  Further, when the supply rotation member 21 rotates, the third turning leg portion 28 turns in the vicinity of the inner peripheral surface of the small diameter cylindrical portion 13. Thereby, the granular material adhering to the internal peripheral surface of the small diameter cylinder part 13 by static electricity etc. can be scraped off.

  By the way, the in-container rotation shaft 20 to which the supply rotation member 21 is fixed receives torque from the motor 50 and rotates. As shown in FIG. 3, the motor 50 is fixed to the movable base 320 and held in a state of being separated above the case ceiling wall 408. Specifically, a motor support base 330 having a portal structure is provided on the upper surface of the central part in the horizontal direction of the lower horizontal board 322 </ b> B of the movable base 320, and the lower horizontal board 322 </ b> B of the motor support base 330 is provided. The motor 50 is fixed to the upper surface of the motor fixing plate 330A facing from above.

  An output shaft 52 protrudes from the lower surface of the motor 50 and penetrates the motor fixing plate 330A in a loosely fitted state.

  In order to connect the output shaft 52 of the motor 50 and the in-container rotary shaft 20 while maintaining the hermeticity of the sealed case 400, the case ceiling wall 408 is provided with a magnetic fluid seal unit 60. The magnetic fluid seal unit 60 protrudes upward from the case ceiling wall 408, passes through the lower horizontal plate 322B of the movable base 320 in a loosely fitted state (non-contact state), and is located near the lower surface of the motor fixing plate 330A. Has reached.

  The magnetic fluid seal unit 60 includes a cylindrical housing 61 that is integrally formed with the case ceiling wall 408 and extends in the vertical direction. The upper and lower ends of the rotary shaft 62 disposed at the shaft center of the housing 61 are bearings. 63 and 63 are rotatably supported by the housing 61. In addition, a fluid seal ring in which a magnetic fluid is fixed around the rotary shaft 62 is provided in a portion sandwiched between the pair of bearings 63 and 63 on the outer peripheral surface of the rotary shaft 62. The fluid seal ring is provided in a plurality of stages in the axial direction of the rotary shaft 62, and the rotation of the rotary shaft 62 is allowed by the plurality of stages of seal rings while maintaining an airtight state. Since the structure and principle of the magnetic fluid seal unit 60 are known (see, for example, Japanese Patent No. 3006780), detailed description thereof is omitted.

  In the magnetic fluid seal unit 60, connection cylinder portions 62 </ b> A and 62 </ b> B with open ends are formed at both upper and lower ends of the rotary shaft 62. The output shaft 52 of the motor 50 is inserted and connected to the upper connecting cylinder portion 62A, and the lower end portion of the in-container rotation shaft 20 is inserted and connected to the lower connecting cylinder portion 62B. Here, between the connecting cylinder part 62A and the output shaft 52, and between the connecting cylinder part 62B and the in-container rotation shaft 20, mutual linear movement in the vertical direction is allowed and rotation is transmitted. ing. Specifically, splines are respectively provided on the inner peripheral surfaces of the connecting cylinder portions 62A and 62B, the outer peripheral surface of the output shaft 52, and the upper end outer peripheral surface of the in-container rotation shaft 20, and these splines are engaged with each other. ing.

  That is, the torque of the motor 50 can be transmitted to the in-container rotation shaft 20, the vertical movement of the supply drum 11 and the movable base 320 with respect to the case ceiling wall 408 is allowed, and the airtight state of the sealed case 400 can be maintained. It is possible. The in-container rotation shaft 20 and the rotation shaft 62 can be centered by the concave and convex engagement between the pin 17P and the pin hole 408P.

  Now, in the weighing device 100 of this embodiment, the weight of the supply drum 11 and its contents (powder particles, supply rotation member 21, etc.) accommodated in the sealed case 400 are arranged outside the sealed case 400. In order to enable measurement with the measuring instrument 300, the following configuration is provided. Specifically, as shown in FIG. 1, a drum holding plate 70 is accommodated in the internal space of the sealed case 400. The drum holding plate 70 is locked to the outer peripheral surface of the supply drum 11 and protrudes laterally. The drum holding plate 70 has a donut-shaped disk structure in which a circular hole 70A (see FIG. 3) is formed through the center of the disk, and the large-diameter cylindrical portion of the supply drum 11 is inside the circular hole 70A. 12 is fitted, and the lower end of the large-diameter cap 15 is locked to the peripheral edge of the circular hole 70A.

  As shown in FIG. 1, the drum holding plate 70 faces the case ceiling wall 408 from below. Female couplers 72 and 72 are provided at positions 180 degrees apart from each other on the upper surface of the drum holding plate 70. The female coupler 72 stands from the upper surface of the drum holding plate 70 toward the case ceiling wall 408. As shown in FIG. 11A, a cylindrical wall 72 </ b> A having an open upper end is formed at the upper end of the female coupler 72. A part of the cylindrical wall 72 </ b> A is constituted by an inner magnet 71. The drum holding plate 70 corresponds to the “inner horizontal plate” of the present invention.

  As shown in FIG. 12, the inner magnet 71 has a plurality of magnet rings 71M and 71M, in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction, are stacked on the same axis, and different magnetic poles are adjacent to each other in the axial direction. (See FIG. 11A) The phase of the magnet rings 71M is fixed. The outer peripheral surface of the inner magnet 71 is exposed on the outer peripheral surface of the cylindrical wall 72A. The inner magnet 71 corresponds to the “first coupling magnet” of the present invention.

  Side hollow protrusions 415 and 415 are formed in the case ceiling wall 408 at positions corresponding to the female couplers 72 so that the female couplers 72 are freely fitted.

  The side hollow protrusions 415 and 415 are provided in pairs at positions 180 degrees apart from each other around the magnetic fluid seal unit 60 in the case ceiling wall 408. Each side hollow protrusion 415 has a cylindrical shape along the outer surface shape on the upper end side of the female coupler 72. Specifically, the upper ends of the inner cylinder wall 415A and the outer cylinder wall 415B that are erected from the case ceiling wall 408 and are concentrically closed with a donut-shaped disk 415C, and the lower end of the inner cylinder wall 415A is a disk 415D. The cylindrical wall 72A (inner magnet 71) of the female coupler 72 is loosely fitted in a cylindrical space formed between the outer cylindrical wall 415B and the inner cylindrical wall 415A so as to be linearly movable. .

  The lower horizontal plate 322B of the movable base 320 faces the drum holding plate 70 from above with the case ceiling wall 408 interposed therebetween. At the position corresponding to the female couplers 72 and 72 in the lower horizontal plate 322B, Male couplers 74, 74 are provided. Specifically, as shown in FIG. 1, cylindrical cover housings 324 and 324 are provided on both sides of the lower horizontal plate 322B with the motor support base 330 interposed therebetween. The cover housing 324 protrudes from the upper surface of the lower horizontal plate 322B and is open at the lower end and closed at the upper end, and receives the upper end of the side hollow protrusion 415 on the inside as shown in FIG.

  As shown in FIG. 11A, a male coupler 74 hangs downward from the center of the ceiling wall 324A of the cover housing 324. The male coupler 74 has a cylindrical shape and is integrated with the cover housing 324, and the lower end portion of the male coupler 74 is constituted by an outer magnet 73. The lower horizontal plate 322B corresponds to the “outer horizontal plate” of the present invention.

  As shown in FIG. 12, the outer magnet 73 overlaps a plurality of magnet disks 73M and 73M in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction on the same axis, and different magnetic poles are adjacent to each other in the axial direction. (See FIG. 11A) The phase of the magnet disks 73M is fixed. The outer peripheral surface of the outer magnet 73 is exposed on the outer peripheral surface of the male coupler 74. The outer magnet 73 corresponds to the “second coupling magnet” of the present invention.

  The male couplers 74 and 74 are loosely fitted inside the inner cylindrical walls 415A and 415A of the side hollow protrusions 415 and 415 so as to be directly movable, and the inner magnet 71 and the outer magnet 73 are connected to the inner cylindrical wall 415A. It is magnetically coupled with a pinch. Specifically, as shown in FIG. 12, each magnet disk 73 </ b> M of the outer magnet 73 is disposed inside and magnetically coupled to each magnet ring 71 </ b> M of the inner magnet 71. The inner magnet 71 and the outer magnet 73 constitute a magnet coupling MC1. The inner cylinder wall 415A of the side hollow protrusion 415 corresponds to the “magnet isolation cylinder wall” of the present invention.

  The drum holding plate 70 and the movable base 320 (lower horizontal plate 322B) are connected by a plurality of magnet couplings MC1 in a non-contact state with the case ceiling wall 408 interposed therebetween, and the supply drum 11 is gravity-coupled. It becomes possible to suspend from the ceiling wall 408 of the sealed case 400 against this. In addition, a change in the weight of the entire supply drum 11 including the contents of the supply drum 11 (powder particles, the supply rotation member 21, etc.) is transmitted from the inner magnet 71 to the outer magnet 73 and further applied to the outer magnet 73. The change in the weight of the entire supply drum 11 is transmitted to the measuring device 300 via the movable base 320. Thereby, it is possible to measure the amount of decrease in the weight measured by the measuring device 300 as the weight of the granular material discharged from the supply drum 11 toward the receiving device 130 in the sealed case 400.

  Here, as shown in FIG. 11B, an auxiliary magnet 75 in which a plurality of magnet rings 75M and 75M are overlapped is fitted to the outside of the cover housing 324, and the auxiliary magnet 75 and the inner magnet of the female coupler 72 are fitted. 71 may be magnetically coupled to reinforce the magnetic coupling force of the magnet coupling MC1.

  In addition, the measuring device 100 of this embodiment is provided with the replenisher 200 for replenishing the supply machine 10 with a granular material. The replenishing machine 200 includes a replenishing drum 211 containing powder particles, and a replenishing pipe 213 that hangs down from the replenishing drum 211 and penetrates the case ceiling wall 408 in an airtight state and is inserted into the supplying drum 11. The powder 250 is supplied into the supply drum 11 through the supply pipe 213 by the motor 250 rotating and driving a discharge rotation guide (not shown) accommodated in the drum 211. The supply drum 211 is suspended above the sealing case 400 by a suspension bracket 312 that is suspended from the top plate 311 of the fixed base 310.

  In addition, a hopper 270 and a chute 271 for supplying powder particles to the supply drum 211 are fixed to the fixed base 310. The hopper 270 and the chute 271 are integrated, and the hopper 270 is disposed above the top plate 311. In the middle of the chute 271, two valves 272 and 272 are arranged one above the other so that the inside of the supply drum 211 communicated with the inside space of the sealed case 400 through the supply pipe 213 and the supply drum 11 is airtight. It is possible to hold it.

  The configuration of the weighing device 100 of the present embodiment is as described above. An operation in the case of measuring the powder particles in the receiver 130 in the sealed case 400 using the weighing device 100 will be described.

  First, the supply drum 11 containing the powder particles is put into the sealed case 400 from the loading / unloading port 401 of the sealed case 400 and attached to the case ceiling wall 408. That is, the female couplers 72 and 72 erected from the drum holding plate 70 are inserted into the side hollow protrusions 415 and 415 of the case ceiling wall 408, and the pin 17P and the pin hole 408P are engaged with each other.

  Then, the magnetic coupling MC1 (the outer magnet 73 and the inner magnet 71) provided between the male couplers 74 and 74 and the female couplers 72 and 72 are magnetically coupled with the case ceiling wall 408 interposed therebetween, and supplied. The drum 11 is held in a state of being hung from the case ceiling wall 408 inside the sealed case 400 (see FIG. 1).

  At this time, the entire weight of the supply drum 11 including the contents of the supply drum 11 (powder particles, the supply rotation member 21, etc.) is transmitted from the inner magnet 71 to the outer magnet 73. To the measuring device 300.

  When the supply drum 11 is suspended from the case ceiling wall 408, the receiver 130 is placed immediately below the supply drum 11, the door 402 of the sealed case 400 is closed, and the internal space of the sealed case 400 is airtight. In the airtight state, the inside of the sealed case 400 is set to a predetermined atmosphere (predetermined temperature, pressure, gas atmosphere).

  When the atmosphere in the sealed case 400 is stabilized, the weight of the entire supply drum 11 including the contents (powder particles, supply rotation member 21 and the like) is weighed by the measuring device 300. Note that the setting (taring) may be performed so that the display of the measuring instrument 300 at this time becomes “0”.

  Next, the motor 50 of the feeder 10 is turned on. Then, the container rotation shaft 20 connected to the output shaft 52 via the magnetic fluid seal unit 60 rotates, and the supply rotation member 21 rotates inside the supply drum 11.

  When the supply rotating member 21 rotates, the granular material accommodated in the large diameter cylindrical portion 12 of the supply drum 11 is scraped into the small diameter cylindrical portion 13 and passes through the slit 33A of the screen plate 33, below the supply drum 11, that is, Then, the liquid is discharged toward the receiver 130 in the sealed case 400.

  As the powder particles are discharged from the supply drum 11, the weight of the entire supply drum 11 decreases, and the change in the weight is transmitted to the measuring device 300 via the inner magnet 71, the outer magnet 73 and the movable base 320. . Then, the amount of decrease in the weight of the entire supply drum 11 measured by the measuring device 300 is taken into the control device 90 as the discharge amount of the granular material from the supply drum 11 (the supply amount to the receiver 130).

  Here, the control device 90 feedback-controls the rotational speed of the motor 50 based on the detection result by the measuring instrument 300 (the amount of decrease in the weight of the entire supply drum 11). Thereby, the granular material can be supplied to the receiver 130 by a predetermined amount or a predetermined amount.

  As described above, the metering device 100 according to the present embodiment includes the female couplers 72 and 72 on the drum holding plate 70, the male couplers 74 and 74 on the movable base 320, and the female couplers 72 and 72. The inner magnets 71 and 71 and the outer magnets 73 and 73 provided in the male couplers 74 and 74 are magnetically coupled inside and outside the sealed case 400 with the case ceiling wall 408 interposed therebetween. As a result, the supply drum 11 is suspended from the case ceiling wall 408 in a state where the supply drum 11 is housed in the sealed case 400, and the weight of the entire supply drum 11 including the granular material is increased from the inner magnets 71 and 71 to the outer magnets 73 and 73. Is transmitted to. The weighing instrument 300 is connected between the movable base 320 (the lower horizontal plate 322B) to which the outer magnets 73 and 73 are fixed and the fixed base 310 (more specifically, the load between the movable base 320 and the fixed base 310). The change in the weight of the entire supply drum 11 applied to the outer magnets 73, 73, that is, the amount of powder supplied to the receiver 130 is measured by the measuring device 300. It is possible.

  As described above, according to the measuring device 100 of the present embodiment, since the measuring device 300 for measuring the supply amount of the granular material to the receiver 130 is arranged outside the sealing case 400, the sealing case The operation of the measuring device 300 does not become unstable due to the atmospheric conditions such as the temperature, pressure, gas, etc. in 400. In other words, it is possible to secure the stability of the operation of the measuring device 300 and to measure the weight of the supply drum 11 disposed in the sealed case 400 and the granular material that is contained therein.

[First Reference Example ]
Hereinafter, a weighing device 590 according to a first reference example of the present invention will be described with reference to FIGS. 13 and 14. As shown in FIG. 13, the weighing device 590 of the present reference example includes a sealed case 400 having an internal space isolated from the outside, and a container 530 that stores liquid, granular materials, and other stored items in the internal space. Can be accommodated.

  A stirrer 600 is fixed to the case ceiling wall 408 of the sealed case 400. The stirrer 600 includes a stirring blade 603 at the tip (lower end) of a shaft 602 extending downward from the motor 601, and the stirring blade 603 is rotated by being submerged in the contents in the container 530. The contents are agitated. Here, a torque transmission magnet coupling (not shown) is provided between the motor 601 and the shaft 602 so that torque can be transmitted in a non-contact manner with the case ceiling wall 408 interposed therebetween. That is, since the shaft 602 does not penetrate the case ceiling wall 408, a seal structure between the shaft 602 and the through hole is not necessary. The case ceiling wall 408 may be provided with the magnetic fluid seal unit 60 as in the first embodiment, and the shaft 602 and the motor 601 may be connected via the magnetic fluid seal unit 60.

As shown in FIG. 13, the sealing case 400 is provided apart from the installation surface of a plurality of case supporting wall 404,40 4 to thus metering device 590, outside of the sealed casing 400 bottom wall 405 (hereinafter, " In the lower space of the case bottom wall 405 ”), an upper pan scale 520 is disposed. The upper pan weighing instrument 520 includes an upper pan 521 for placing an object to be weighed in the center of the upper surface. The upper plate 521 is opposed to the case bottom wall 405 from below, and the load received by the upper plate 521 from the weighing object placed on the upper plate 521, that is, the weight of the weighing object is measured by the upper plate measuring device 520. It can be detected by a known detection unit 524 (for example, a load cell) built in.

  The upper plate 521 includes a weighing plate 522 and a flat cover plate 523 mounted on the weighing plate 522 so as to cover the entire upper surface of the weighing plate 522.

A table-shaped container base 510 is disposed on the upper surface of the cover plate 523. Table type container base 510 includes a table top plate 51 2 a flat plate shape, and a plurality of table legs 513, 513 Metropolitan depending from the table top plate 512. The table ceiling plate 512 is accommodated in the internal space of the sealed case 400 and is horizontally disposed above the case bottom wall 405. A container 530 can be placed on the upper surface of the table ceiling plate 512. The table leg portion 513 connects the table ceiling plate 512 and the upper plate 521 (cover plate 523) with the case bottom wall 405 interposed therebetween, and can transmit a load from the table ceiling plate 512 to the upper plate 521. It has a configuration.

Specifically, as shown in FIG. 14, each table leg 513 includes a lower coupler 514 provided integrally with the cover plate 523 and an upper coupler provided integrally with the table ceiling plate 512 in the vertical direction. The lower coupler 514 and the upper coupler 516, which are divided into 516 and disposed with the case bottom wall 405 interposed therebetween, are magnetically coupled in a non-contact manner by the magnet coupling MC2.

  The lower coupler 514 stands vertically toward the case bottom wall 405 from positions separated from each other on the upper surface of the cover plate 523. The lower coupler 514 includes a cylindrical wall 514 </ b> A having an open upper end at the upper end portion of the columnar body, and a part of the cylindrical wall 514 </ b> A is configured by a cylindrical first linear motion magnet 515. The first linear motion magnet 515 has a plurality of magnet rings 515M and 515M in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction overlapped on the same axis, and the magnetic rings 515M so that different magnetic poles are adjacent in the axial direction. The phase between each other is fixed. The inner peripheral surface of the first linear motion magnet 515 is exposed on the inner peripheral surface of the cylindrical wall 514A.

  A plurality of side hollow protrusions 430 are formed on the case bottom wall 405 corresponding to the shape of the lower coupler 514. The side hollow protrusion 430 stands up from the case bottom wall 405 and concentrically arranges the upper ends of the inner cylinder wall 430A and the outer cylinder wall 430B with a donut-shaped disk 430C and the lower end of the inner cylinder wall 430A. The cylindrical wall 514A (first linear magnet 515) of the lower coupler 514 can be linearly moved in a cylindrical space formed between the outer cylindrical wall 430B and the inner cylindrical wall 430A. Are loosely fitted.

  On the other hand, the upper coupler 516 hangs down from the positions of the lower surface of the table ceiling plate 512 toward the case bottom wall 405 (specifically, the side hollow protrusion 430). The upper coupler 516 has a columnar shape smaller than the inner diameter of the inner cylinder wall 430 </ b> A, and the lower end portion of the upper coupler 516 is constituted by a cylindrical second linear motion magnet 517. The second linear motion magnet 517 has a plurality of magnet disks 517M and 517M in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction on the same axis, and the magnetic disks 517M so that different magnetic poles are adjacent in the axial direction. The phase between each other is fixed. The outer peripheral surface of the second linear motion magnet 517 is exposed on the outer peripheral surface of the upper coupler 516.

The upper coupler 516 (second linear motion magnet 517) is loosely fitted inside the inner cylindrical wall 430A of the side hollow protrusion 430 so as to be linearly movable, whereby the first linear motion magnet 515 and the second linear motion are moved. A magnet 517 is magnetically coupled with the inner cylinder wall 430A interposed therebetween. Specifically, the magnet disks 517M of the second linear motion magnet 517 are respectively arranged and magnetically coupled inside the magnet rings 515M of the first linear motion magnet 515. The second linear motion magnet 517 and the first linear motion magnet 515 constitute a magnet coupling MC2 .

  The load of the container 530 placed on the table ceiling plate 512 in the hermetic case 400 and the contents stored therein is the upper plate 521 of the upper plate weighing device 520 disposed outside the hermetic case 400 via the magnet coupling MC2. Is transmitted to. Further, since the cylindrical wall 514A of the lower coupler 514 is loosely fitted outside the inner cylindrical wall 430A of the case bottom wall 405 and the upper coupler 516 is loosely fitted inside the inner cylindrical wall 430A, the upper plate 521 and the table ceiling Relative movement (lateral deviation) in the horizontal direction of the plate 512 is prohibited, and the container 530 can be held so as to move up and down at a position vertically above the upper pan weighing device 520.

  Here, the case bottom wall 405 is always disposed above the upper plate 521 so that the weight of the sealed case 400 is not transmitted to the upper plate 521, and the case hollow wall 405 is formed between the side hollow protrusion 430 and the lower coupler 514. The space is always separated in the vertical direction (see FIG. 14).

  Further, the side hollow protrusion 430, the upper coupler 516, and the table ceiling plate 512 are always separated in the vertical direction so that the side hollow protrusion 430 does not receive a load applied to the table ceiling plate 512. .

  The cover plate 523 is made of a nonmagnetic material and is relatively thick. By this cover plate 523, it is possible to prevent the magnetic coupling MC2 from affecting the upper pan weighing device 520 (specifically, the weighing pan 522 and the detection unit 524).

  Reference numeral 581 in FIG. 13 denotes a lamp heater 181 (infrared lamp or halogen lamp) for heating the contents accommodated in the container 530. Reference numeral 582 denotes a temperature sensor for measuring the temperature of the contents in the container 530.

The above is a description of the configuration of the present embodiment will now be described the operation of the present embodiment. When weighing the contents stored in the container 530, the display of the upper plate weighing instrument 520 is displayed with the table-shaped container base 510 set on the upper weighing container 520 and the container 530 is not placed. It is set to “0” (tare), and then the container 530 is placed on the table ceiling plate 512.

  At this time, the weight of the container 530 including the contents (hereinafter referred to as “the entire container 530”) is weighed by the upper pan meter 520. That is, the load of the entire container 530 placed on the table ceiling plate 512 is sealed through the magnet coupling MC2 (the first linear motion magnet 515 and the second linear motion magnet 517) provided in the table leg portion 513. It is transmitted to the upper plate 521 of the upper plate weighing device 520 arranged below the outer side 400 (below the case bottom wall 405), whereby the weight of the entire container 530 is measured by the upper plate weighing device 520.

Here, the side hollow protrusion 430, the upper coupler 516, and the table ceiling board 512 are always separated in the vertical direction so that no load is applied to the side hollow protrusion 430 from the table ceiling board 512. That is, the load of the entire container 530 applied to the table ceiling plate 512 is transmitted only to the upper plate 521 of the upper plate weighing device 520. In other words, force transmission is allowed between the upper coupler 516 and the lower coupler 514, but force transmission is blocked between the sealed case 400 and the upper coupler 516 and between the sealed case 400 and the lower coupler 514. Therefore, the weight of the entire container 530 can be measured by the upper pan meter 520. Thus, the weighing device 590 of this reference example also has the same effect as the first embodiment.
In this reference example, the table leg portion 513 has an upper coupler 516 inserted inside the cylindrical lower coupler 514, and the upper side inside the cylindrical first linear motion magnet 515 provided in the lower coupler 514. Although the second linear motion magnet 517 provided in the coupler 516 is disposed and magnetically coupled in the horizontal direction (see FIG. 14), it may be configured as shown in FIG. That is, the table leg portion 513 is cut in the middle of the vertical direction at a cutting plane orthogonal to the axial direction to form a pair of leg portion structures 513A and 513B, and in the vertical direction of the leg portion structures 513A and 513B. Magnets 519 and 519 that repel each other may be disposed on the opposed surfaces. In this case, in order to restrict the horizontal displacement between the cover plate 523 and the table ceiling plate 512 constituting the upper plate 521 in the horizontal direction, for example, the leg constituent members 513A and 513B protrude from the upper and lower surfaces of the case bottom wall 405. A pair of linear motion guide cylinders 509 and 509 that are loosely fitted so as to be linearly movable are provided on the outside. Or, although not shown, instead of the linear motion guide cylinders 509 and 509, guide posts are provided on the case bottom wall 405, and the guide posts are loosely fitted in the guide holes formed in the magnets 519 and 519 so as to be linearly movable. May be.

[ Second Embodiment]
This embodiment is a modification of the first embodiment in which the supply drum 11 is suspended from the case ceiling wall 408. In the first embodiment, the output shaft 52 of the motor 50 and the in-container rotation shaft 20 are connected via the magnetic fluid seal unit 60. However, in this embodiment, the output shaft 52 and the in-container rotation are connected. The shaft 20 is connected by a magnet coupling MC3 that is magnetically coupled with the case ceiling wall 408 interposed therebetween. Further, with the provision of the magnet coupling MC3, the magnet couplings MC1 and MC1 in the first embodiment are abolished. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and duplicate descriptions are omitted.

  As shown in FIG. 15, a female coupler 610 is fixed to an upper end portion of the in-container rotation shaft 20 protruding from the upper surface of the large-diameter cap 15 so as to be integrally rotatable. The female coupler 610 has a structure in which a cylindrical wall 612 is integrally provided on an upper portion of a columnar portion 611, and the upper end portion of the in-container rotation shaft 20 rotates in a fitting hole 611A penetrating the axis of the columnar portion 611. It is impossible to fit. A part of the cylindrical wall 612 is constituted by the inner magnet 71.

  The female coupler 610 is accommodated inside a cap-shaped joint 170 that is screwed into the cylindrical screwing wall 15 </ b> C of the large-diameter cap 15. The cap joint 170 prohibits the movement of the female coupler 610 in the axial direction (vertical direction) and allows relative rotation. The cap joint 170 has a shape corresponding to the female coupler 610.

  Specifically, the cap-shaped joint 170 includes an inner cylindrical wall 170A and an outer cylindrical wall 170B that are concentrically disposed, and upper ends of the outer cylindrical wall 170B and the inner cylindrical wall 170A are connected to each other with a donut-shaped annular wall. The structure is joined at 170C, and the lower end portion of the inner cylindrical wall 170A is closed by the disc wall 170D. Then, the cylindrical wall 612 (inner magnet 71) of the female coupler 610 is accommodated in a loosely-fitted state that allows relative rotation in a cylindrical space formed between the inner cylindrical wall 170A and the outer cylindrical wall 170B. Pins 17P and 17P are erected from the stepped surface formed on the outer peripheral surface of the cap-shaped joint 170, and are engaged with the pin holes 408P and 408P formed in the case ceiling wall 408 in an uneven manner.

  A center hollow protrusion 420 is formed in a vertically lower portion of the motor 50 in the case ceiling wall 408. As shown in FIG. 15, the center hollow protrusion 420 protrudes from the upper surface of the sealed case 400 and penetrates the lower horizontal plate 322 </ b> B of the movable base 320 in a loosely fitted state (non-contact state).

  The center hollow protrusion 420 has a shape corresponding to the female coupler 610 and the cap joint 170. Specifically, the center hollow protrusion 420 includes an inner cylindrical wall 420A and an outer cylindrical wall 420B that are concentrically disposed, and upper ends of the outer cylindrical wall 420B and the inner cylindrical wall 420A are connected to each other with a donut-shaped annular wall. While being joined by 420C, the lower end portion of the inner cylindrical wall 420A is closed by the disc wall 420C. And the cap-shaped joint 170 is loosely fitted in the inner space of the center hollow protrusion 420 in a state where it can move in the vertical direction and cannot rotate.

  A male coupler 615 is fixed to the output shaft 52 of the motor 50. While rotation can be transmitted between the output shaft 52 and the male coupler 615, direct movement in the vertical direction is prohibited. The male coupler 615 has a columnar shape in which the upper end portion fitted to the output shaft 52 has a stepped larger diameter than the lower portion thereof, and extends vertically downward from the motor 50. Yes. Further, the lower end portion of the male coupler 615 is constituted by an outer magnet 73, and the outer magnet 73 is exposed on the outer peripheral surface of the male coupler 615.

  The male coupler 615 is loosely fitted inside the inner cylindrical wall 420A of the center hollow protrusion 420 so as to be linearly movable in the vertical direction, and the inner magnet 71 and the outer magnet 73 are connected to the inner cylindrical wall of the center hollow protrusion 420. The magnetic coupling 420A and the inner cylindrical wall 170A of the cap-shaped joint 170 are sandwiched therebetween. Specifically, as shown in FIG. 16, the magnet disks 73 </ b> M of the first outer magnet 73 are respectively arranged and magnetically coupled inside the magnet rings 71 </ b> M of the inner magnet 71. These inner magnet 71 and outer magnet 73 constitute a magnet coupling MC3.

  The male coupler 615 and the female coupler 610 are connected so as to be integrally rotatable by the magnet coupling MC3, and the torque of the motor 50 disposed above the outside of the sealed case 400 is applied to the in-container rotating shaft 20 in the supply drum 11. It is possible to communicate.

  Further, the supply drum 11 can be held in a suspended state from the ceiling wall 408 of the sealed case 400 against the gravity by the magnet coupling MC3. Then, a change in the weight of the entire supply drum 11 including the contents of the supply drum 11 (powder particles, the supply rotation member 21, etc.) is transmitted from the inner magnet 71 to the outer magnet 73 and applied to the outer magnet 73. A change in the weight of the entire supply drum 11 is transmitted to the measuring device 300 via the motor 50, the motor support base 330, and the movable base 320. Therefore, it is possible to measure the weight reduction amount measured by the measuring device 300 as the weight of the granular material supplied from the supply drum 11 to the receiving device 130 in the sealed case 400. That is, the configuration of the present embodiment also has the same effect as the first embodiment.

  During rotation of the in-container rotation shaft 20, the female coupler 610 rotates relative to the cylindrical joint 17 and the bearing 16, so that the cap joint 170 and the bearing 16 are reduced in order to reduce frictional resistance therebetween. May be made of a resin having a low frictional resistance (for example, PTFE), or a sliding contact member that reduces the frictional resistance may be sandwiched between the sliding contact surfaces. Further, gaps are provided between the outer peripheral surface of the female coupler 610 and the outer cylindrical wall 170B of the cap-shaped joint 170 and between the cylindrical wall 612 of the female coupler 610 and the inner cylindrical wall 170A of the cap-shaped joint 170. May be.

[ Second Reference Example ]
The second reference example is a modification of the first reference example in which the upper pan weighing instrument 520 is disposed below the case bottom wall 405, and is shown in FIG. As shown in the figure, the weighing device of this reference example is provided with magnets 550 and 551 that repel each other in the vertical direction via the case bottom wall 405 on both the upper plate weighing device 520 and the container 530. , 551 constitute a magnet coupling MC4. Hereinafter, with respect to the same configuration as that of the first reference example , the same reference numerals are assigned, and redundant description is omitted, and only the configuration different from that of the first reference example will be described.

  A magnet holding plate 552 is placed on the weighing pan 522 of the upper pan weighing device 520. The magnet holding plate 552 holds the magnet 550 at the center of the upper surface, and the lower surface and side surfaces of the magnet holding plate 552 are covered with a magnetic shielding case 553. The magnet 550 has a flat plate shape, and is opposed to the lower side with a gap between the case bottom wall 405 and the magnet 550. The magnet 550 is an SN pole in the plate thickness direction (vertical direction).

  On the other hand, a container placement board 554 capable of placing a container 530 on the upper surface is accommodated in the internal space of the sealed case 400. The container placement board 554 holds a magnet 551 at the center thereof, and the upper surface and the side surface of the container placement board 554 are covered with a magnetic shielding case 555. Further, the magnet 551 has a flat plate shape, and is opposed to the case bottom wall 405 with a gap therebetween. The magnet 551 is an SN pole in the plate thickness direction (vertical direction).

  As shown in FIG. 17, the magnet 550 held on the magnet holding plate 552 and the magnet 551 held on the container mounting plate 554 are arranged so that the same magnetic poles (for example, S magnetic poles) face each other. And repel each other in the vertical direction across the case bottom wall 405. The container mounting board 554 is levitated above the case bottom wall 405 by the repulsive force.

  Here, a container guide is provided between the case bottom wall 405 and the container mounting board 554 in order to guide the container mounting board 554 so that it can move up and down and cannot move horizontally. More specifically, a plurality of guide pins 560 and 560 are vertically erected from the inner surface of the case bottom wall 405, and the guide pins 560 and 560 are directly connected to the guide holes 561 and 561 formed in the container mounting board 554. It is inserted movably.

The total weight of the container 530 and the entire container 530 including the contents thereof, the container placement board 554 and the magnet holding board 552 is transmitted to the upper plate weighing device 520 via the magnets 550 and 551, and the upper plate weighing machine 520 It becomes possible to measure the weight. Then, the amount of change in the measured value by the upper plate weighing device 520 can be measured as the amount of change in the weight of the contents stored in the container 530. As described above, the configuration of the present reference example also achieves the same effect as that of the first embodiment.

  Here, when the frictional resistance between the guide pins 560 and 560 and the guide holes 561 and 561 is large when the container placement board 554 moves up and down, an error may occur in the measurement value by the upper pan weighing instrument 520. Therefore, a plurality of balls (not shown) held by a retainer (not shown) are allowed to roll between the outer peripheral surfaces of the guide pins 560 and 560 and the inner peripheral surfaces of the guide holes 561 and 561 so as to be linearly moved. You may reduce the frictional resistance at the time. Alternatively, a magnetic repulsive force is generated between the inner peripheral surfaces of the guide holes 561 and 561 and the outer peripheral surfaces of the guide pins 560 and 560, and the outer peripheral surfaces of the guide pins 560 and 560 and the guide holes 561 are generated by the repulsive force. , 561 may be configured to be linearly movable in a loose fitting state without contact with the inner peripheral surface.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) The weight of the granular material discharged from the supply drum 11 by combining the measurement mechanism of the supply drum 11 in the first embodiment and the measurement mechanism of the container 530 in the first or second reference example , It is good also as a structure which can measure both the weight of the granular material actually received by the receiver 130. FIG. Similarly, the metering mechanism of the supply drum 11 in the second embodiment may be combined with the metering mechanism of the container 530 in the first or second reference example .

  (2) In the first embodiment, the upper coupler 516 has a columnar shape, the cylindrical wall 514A is formed on the lower coupler 514, and the upper coupler 516 is loosely fitted on the inner side so as to be linearly movable. Alternatively, the lower coupler may be formed in a columnar shape, a cylindrical wall having an open lower end may be provided on the upper coupler, and the lower coupler may be loosely fitted on the inner side thereof so as to be directly movable.

( 3 ) In the second embodiment, the female coupler 610 is fixed to the in-container rotation shaft 20 and the male coupler 615 is fixed to the output shaft 52 of the motor 50. The coupler 615 may be fixed, and the female coupler 610 may be fixed to the output shaft 52 of the motor 50.

( 4 ) In the first and second embodiments, the replenisher 200 is provided. However, the replenisher may not be provided. Further, the supply drum 211 and the supply pipe 213 may be eliminated, and the lower end portion of the chute 271 may be directly inserted into the supply port 15 </ b> A of the supply drum 11.

( 5 ) In the said 1st and 2nd embodiment, the supply drum 11 should just be the structure which can discharge | release the accommodation accommodated in the downward direction, and is a supply rotation member which provides external force to an internal granular material. It does not have to be provided. For example, the lower end portion of the container may be conical or pyramidal to form a hopper shape, and the granular material may fall by its own weight. The supply rotation member provided in the supply drum 11 is not limited to the configuration of the first embodiment. For example, the screen plate 33 is not provided, and the lower end portion of the small-diameter cylindrical portion 13 is fully open. In this case, the first to third swivel legs 26 to 28 in the supply rotation member 21 may be eliminated, and only the dust collection blade 23 and the dusting blade 24 may be provided.

( 6 ) In the first and second embodiments described above, the granular material is supplied to one receiver 130 accommodated in the sealed case 400, but can be moved horizontally on the case bottom wall 405. A movable container holder (not shown) is provided to hold the plurality of receivers 130 on the upper surface of the movable container holder, and the plurality of receivers 130 are sequentially positioned immediately below the supply drum 11. May be distributed and supplied from the supply drum 11 to the plurality of receivers 130 by a predetermined amount. Instead of the plurality of receptacles 130, the deep well plate may be held by the movable container holder and distributed to each well.

( 7 ) Further, the movable container holder holds the plate-shaped substrate instead of the receiver 130, and the granular material is supplied to the upper surface of the plate-shaped substrate by moving the movable container holder while moving the movable container holder. You may make it draw a line.

11 Supply drum (container)
70 Drum holding plate (inner horizontal plate)
71 Inner magnet (first coupling magnet)
71M Magnet ring 73 Outer magnet (second coupling magnet)
73M Magnet disk 100 Weighing device 130 Receptor (receiving part)
300 Weigher 310 Fixed base 322B Lower horizontal plate (outer horizontal plate)
400 Sealed case 404 Case support wall 405 Case bottom wall 408 Case ceiling wall 415A Inner cylinder wall (magnet isolation cylinder wall)
430A Inner cylinder wall 509, 509 Linear motion guide cylinder (container guide)
512 Table ceiling plate 514 lower coupler La 514A cylindrical wall 515 first linear magnet 515M magnetic ring 516 upper coupler La 517 second linear magnet 517M magnet disk 519, 519 magnet 520 upper tray measuring 521 upper tray 530 container 550, 551 Magnet 560, 560 Guide pin (container guide)
561, 561 Guide hole (container guide)
590 Weighing device MC1 Magnet coupling MC2 Magnet coupling MC3 Magnet coupling MC4 Magnet coupling

Claims (3)

A sealed case with an internal space isolated from the outside,
A measuring instrument provided outside the sealed case;
The liquid containing the liquid, the granular material, and the other items contained in the container are magnetically coupled between the measuring device and the container accommodated in the sealed case through a wall portion constituting the sealed case. A magnetic coupling capable of transmitting the weight of the entire container to the weighing instrument ;
A fixed base fixed to the outside of the hermetic case and a part or the whole of the base is disposed above and outside the hermetic case;
The container is suspended from the ceiling wall of the hermetic case so as to be movable up and down, and the contents can be discharged to a receiving part arranged at the lower part of the hermetic case,
The magnet coupling is suspended from the fixed base and disposed on the outside of the ceiling wall, and is fixed to the container in a non-contact state with the ceiling wall sandwiched between the outer magnet and the outer magnet. It is magnetically coupled and consists of an inner magnet that transmits the weight of the entire container to the outer magnet,
A weighing apparatus, wherein the weighing device is arranged between the outer magnet and the fixed base so that a change in weight of the entire container applied to the outer magnet can be measured. An outer horizontal plate suspended from the fixed base and facing from above the ceiling wall of the sealed case;
An inner horizontal plate that protrudes laterally from the container and faces the outer horizontal plate from below with the ceiling wall of the sealed case interposed therebetween,
Placing the weighing instrument between the outer horizontal plate and the fixed base;
The inner magnet is fixed at a plurality of positions that are point-symmetric with respect to the container in the inner horizontal plate,
2. The measuring device according to claim 1, wherein a plurality of the outer magnets are fixed to positions on the outer horizontal plate facing the plurality of inner magnets in the vertical direction, and are magnetically coupled to the inner magnets. apparatus. A plurality of magnet rings in which S magnetic poles and N magnetic poles are alternately arranged in the circumferential direction are stacked on the same axis, and the phases of the magnet rings are fixed so that different magnetic poles are adjacent in the axial direction. A first coupling magnet;
A plurality of magnet disks having a columnar shape or a cylindrical shape loosely fitted inside the first coupling magnet and having S magnetic poles and N magnetic poles alternately arranged in the circumferential direction are coaxially stacked and the axis thereof A second coupling magnet formed by fixing the phases of the magnet disks so that different magnetic poles are adjacent to each other in a direction;
Either one of the first coupling magnet or the second coupling magnet is the outer magnet, and the other is the inner magnet.
A magnet isolation cylinder wall is formed by projecting a part of the ceiling wall of the hermetic case into a cylindrical shape with a tip toward the inside or the outside, and the second coupling magnet is connected to the inside of the magnet isolation cylinder wall. The weighing device according to claim 2, wherein the first coupling magnet is loosely fitted to the outside of the magnet isolation cylinder wall.