JP5361968B2 - Liquid supply dispersion device - Google Patents

Description

  The present invention relates to a liquid supply / dispersion device for producing granules such as granular foods and pharmaceuticals from raw materials prepared in a liquid, slurry, or paste form, and more specifically, a cylindrical vacuum container with sealed ends. The present invention relates to a liquid supply dispersion device including an endless transfer belt placed inside, a supply nozzle for uniformly supplying the raw material onto the transfer belt, and the like.

  The raw material prepared in a liquid, slurry, or paste form is dried to produce a porous strip-shaped solid, and the strip-shaped solid is cut into a plate-shaped solid having an appropriate size. Various types of liquid supply / dispersion devices that produce granules by grinding solids are provided.

  For example, as shown in FIG. 5, a liquid supply / dispersing device described in Patent Document 1 includes a vacuum container 101 that seals both ends of a horizontal cylindrical body and maintains a vacuum degree of about 10 torr, and a vacuum container 101. An endless transport belt 102 made of resin placed inside, and a discharge pipe 103 disposed on the upstream side of the transport belt 102 and having a small hole for supplying (discharging) the raw material 1 onto the transport belt 102. A vacuum drying means 104 for drying the raw material 1 on the conveyor belt 102 to produce a strip-shaped solid 2, a pre-crusher 105 for cutting the strip-shaped solid 2 into a plate-shaped solid 3 having an appropriate size, and a vacuum A discharge port 106 for discharging the plate-like solid 3 to the outside of the vacuum vessel 101 while maintaining the inside of the container 101 in a vacuum, and a main crusher (not shown) for pulverizing the discharged plate-like solid 3 into granules. ing.

  The vacuum drying means 104 is provided with a first constant rate drying zone 104a, a second constant rate drying zone 104b, a decreasing rate drying zone 104c, and a cooling zone 104d from the upstream side to the downstream side of the conveyor belt 102. The raw material 1 on the conveyor belt 102 is gradually dried.

  That is, the raw material 1 is supplied over the entire width from the discharge pipe 103 onto the conveying belt 102, and the raw material 1 travels through the zones 104 a to 104 d of the vacuum drying means 104, so 2. The strip-shaped solid 2 is cut by the pre-crusher 105 to generate a plate-shaped solid 3, and after the plate-shaped solid 3 is discharged out of the vacuum vessel 101 from the discharge port, it is pulverized by the main crusher. As a result, granules are produced.

  In addition, although not shown in the drawing, the liquid supply dispersion device is provided with a liquid supply nozzle attached to the tip of the liquid supply arm that reciprocally swings instead of the discharge pipe 103, and the liquid supply nozzle is swung in an arc shape above the transport belt. There are also models that can be moved. In this liquid supply dispersion device, the liquid supply nozzle reciprocally swings while drawing an arc-shaped locus above the conveyance belt, and the conveyance belt is conveyed at a constant speed, so that the raw material is fed over almost the entire width of the conveyance belt. To be liquidated.

  The liquid supply nozzle that reciprocally swings while drawing an arcuate locus moves in an arc shape at a constant speed in the width direction of the conveyor belt, decelerates at each end of the conveyor belt, temporarily stops, and then turns back. When reciprocating, the raw material is applied more on both sides of the conveyor belt than on the central portion. Then, since the raw material on a conveyance belt is not dried uniformly in the width direction of a conveyance belt, it cannot produce | generate a uniform strip-like solid substance and by extension, a homogeneous granule.

  Therefore, Patent Document 2 discloses a liquid supply dispersion apparatus and method that can uniformly distribute and supply raw materials onto a conveyor belt. In this liquid supply dispersing device, the base end portion of the liquid supply arm is attached to a swing shaft that is erected in a vertical posture in the vacuum vessel, and the lower end portion of the swing shaft protrudes from the outer bottom portion of the vacuum vessel. A reciprocating drive mechanism is connected to the lower end portion of the protruding swing shaft. The reciprocating drive mechanism is configured by combining a worm gear integrally fixed to the lower end portion of the swing shaft, a worm shaft meshed with the worm gear, a motor coaxially connected to the worm shaft, and the like.

  As the motor rotates forward and backward, the swing shaft rotates forward and backward (oscillates in the circumferential direction) at a predetermined angle. Then, by the forward / reverse rotation of the motor, the liquid supply arm connected to the swinging shaft moves forward, decelerates at high speed, low speed, high speed, and deceleration from the forward path start point, reverses at the forward path end point, and high speed, low speed, It moves backward to decelerate at high speed and reverses at the end of the return path.

  The liquid supply arm and the liquid supply nozzle also reciprocate in accordance with the forward / reverse rotation of the motor. Then, the raw material supplied from the nozzle attached to the tip of the liquid supply arm is applied onto the conveyor belt so as to ensure a necessary application amount in the vicinity of the start and end points of the reciprocating path, and the central portion of the conveyor belt. The application amount in the vicinity is almost doubled and the liquid is supplied, so that it is applied to a uniform thickness in the width direction of the conveyor belt.

Utility Model Registration No. 2558539 JP-A-11-98975

  In the liquid supply dispersion device described in Patent Document 2, the swing shaft is swung at a predetermined angle by rotating the motor forward and backward. In addition, since a liquid supply arm is attached to the swing shaft, a large moment is applied.

  As a result, in the region where the liquid supply arm reverses, the acceleration and torque of the motor become very large, and even if inverter control is performed, it is difficult to stably control acceleration / deceleration. The raw material supplied to the top may be thick at both ends of the conveyor belt and thin at the middle, that is, it may not be possible to produce a plate-like solid having a uniform thickness. As a result, granules with non-uniform quality are produced.

  In addition, it is difficult for the liquid supply / dispersion device described in Patent Document 1 to individually set acceleration / deceleration control depending on the liquid type such as the viscosity of the raw material and the expansion rate during drying.

  In view of this, the present invention makes it possible to supply the raw material evenly in the width direction of the transport belt by accurately controlling acceleration / deceleration in the reversal region of the liquid supply arm, and also according to the characteristics of the raw material. It is an object of the present invention to provide a liquid supply dispersion device that can individually set acceleration / deceleration control.

The liquid supply / dispersion device according to the present invention includes an endless transport belt placed in a vacuum container, and an oscillating shaft having a base end projecting out of the vacuum container between the upstream end of the transport belt and the vacuum container. The base end of the liquid supply arm with the liquid supply nozzle attached to the distal end is fixed to the swing shaft, and the liquid supply arm and the liquid supply nozzle are reciprocally swung around the swing shaft as a central axis. A liquid supply / dispersing device provided at a base end portion of a swing shaft, wherein the drive source includes a motor rotating in one direction, a drive crank fixed to the rotation shaft of the motor, and the swing A driven crank fixed to the base end of the shaft, and a tie rod having a base end and a tip connected to the tip of the driving crank and the tip of the driven crank, respectively , It depends on the motor shaft rotation angle so as to accelerate the liquid supply arm in the nozzle reversal operation area. It is characterized by a servo motor which can control the rotational speed Te.

  According to this liquid supply dispersion device, the rotating shaft of the motor rotates in one direction, whereby the driving crank and the base end of the tie rod rotate in one direction, but the tip of the tie rod is connected to the driven crank. Therefore, the tip portion of the tie rod and the driven crank swing back and forth. Accordingly, the swing shaft that fixes the base end portion of the driven crank rotates forward and backward (swing motion) in the circumferential direction, and the liquid supply arm and the liquid supply nozzle that are fixed to the swing shaft reciprocally swing.

  In short, the liquid supply arm and the liquid supply nozzle swing back and forth while the acceleration / deceleration is stably controlled as the motor rotates in one direction. Further, the acceleration / deceleration control of the motor can be individually set according to the liquid type such as the viscosity of the raw material and the expansion coefficient during drying. Note that the rotation shaft of the motor to which the base end portion of the driving crank is fixed may be not only the actual rotation shaft but also a rotation shaft in which a gear is fixed to the actual rotation shaft and a gear meshing with the gear is fixed. Good.

  According to this liquid supply dispersion device, the motor can be accelerated in the reversal operation region of the liquid supply arm by using the servo motor as the motor. Therefore, the raw material supplied from the liquid supply nozzle onto the conveyor belt is reduced in the amount applied by the liquid supply nozzle moving at high speed in the reversal operation region, and is applied in duplicate. The coating amount can be made uniform over the entire width of the conveyor belt.

  Further, in the liquid supply dispersion device according to the present invention, a load means for gradually accelerating the liquid supply arm after the liquid supply arm stably decelerates and reverses in the reversal operation region of the liquid supply nozzle is provided in the driven crank. It is preferable that it is attached.

  According to this liquid supply dispersion device, since the load means is attached to the driven crank, a load is always applied to the rotation of the motor via the tie rod and the drive crank, and at the reverse position of the driven crank, The load status is reversed.

The load means is gradually extended while the driven crank rotates from one reversal position to the other position, and expands and contracts to shrink after passing the other reversal position. The backlash of the shaft gear is prevented, and the driven crank gradually decelerates and accelerates before and after the reverse position. By doing so, the liquid supply nozzle can be reversed gradually rather than instantaneously.
In the liquid supply / dispersing device according to the present invention, the rotational speed of the motor is controlled slightly faster in the region where the driven crank is reversed from the forward movement to the backward movement than in the region where the driven crank is reversed from the backward movement to the backward movement. May be.

  According to the present invention, there is provided a liquid supply dispersion device including a driving source in which a driving crank fixed to a rotating shaft of a motor and a driven crank fixed to a swinging shaft are connected by a tie rod. A thick band-like solid can be produced, and granules such as foods and pharmaceuticals with uniform quality can be produced.

1 shows an embodiment of a liquid supply / dispersing device according to the present invention, where (a) is a sectional front view of an essential part, and (b) is an enlarged sectional side view of the essential part. It is a principal part enlarged plan view which shows one Embodiment of the liquid distribution apparatus which concerns on this invention. 1 shows an embodiment of a drive source provided in a liquid supply dispersion device according to the present invention, and (a), (b), and (c) are schematic explanatory views of different states. 1 shows an embodiment of a liquid supply and dispersion device according to the present invention, where (a) is an explanatory view showing the rotational speed of a motor shaft at each angle of the driving crank, and (b) and (c) are the angle of the driving crank and motor shaft rotation. It is explanatory drawing which shows a response | compatibility with an angle. It is a schematic sectional drawing which shows an example of the conventional liquid supply dispersion | distribution apparatus.

  An embodiment of a liquid supply dispersion device according to the present invention will be described with reference to FIGS. This liquid supply dispersion device is a porous band-shaped solid that is obtained by drying raw materials prepared in a liquid, slurry or paste form in a vacuum vessel 10 that seals both ends of a cylinder and maintains a vacuum of about 10 torr. It is an apparatus for generating an object (see FIG. 5).

  In the vacuum vessel 10, an endless transport belt 11 is placed in a horizontal posture, and the raw material supplied from the liquid supply nozzle 21 is applied on the upstream side of the transport belt 11. The liquid supply nozzle 21 is attached to the tip of a liquid supply arm 22 that reciprocally swings. The liquid supply arm 22 is provided with a pipe portion through which the raw material flows in the length direction, and the tip of the pipe portion communicates with the liquid supply nozzle 21.

  The base end portion of the liquid supply arm 22 is fixed to a swinging shaft 23 erected in a vertical posture between the upstream end of the transport belt 11 and one end portion of the vacuum vessel 10. The swinging shaft 23 swings in the circumferential direction about the central axis (swing motion), so that the liquid supply arm 22 swings, and the liquid supply nozzle 21 attached to the tip of the liquid supply arm 22 is moved. It swings back and forth above the upstream end of the conveyor belt 11. The swinging shaft 23 is also provided with a pipe portion in the length direction so that the raw material can flow, and the raw material is sent from the pipe portion in the swinging shaft 23 into the pipe portion of the liquid supply arm 22.

  In this embodiment, the conveyance belts 11 are arranged in six stages in the vertical direction, and the liquid supply arm 22 to which the liquid supply nozzle 21 is attached is reciprocally swung above the upstream end of each conveyance belt 11. ing. Accordingly, the five liquid supply arms 22 excluding the uppermost liquid supply nozzle 21 are sandwiched between the transport belts 11 with a space therebetween.

  A support column 24 is erected in parallel with the swing shaft 23 between the swing shaft 23 and one end of the vacuum vessel 10. The swing shaft 23 is supported by the support 24 at a plurality of positions by a holder 25 so as to be able to swing. The upper and lower ends of the support column 24 protrude from both the upper and lower sides of the vacuum vessel 10, but the swing shaft 23 protrudes from the lower side of the vacuum vessel 10 only at the lower base end portion 23 a.

  A driving source 30 is provided at the base end portion 23 a of the swing shaft 23 protruding from the lower side of the vacuum vessel 10. The driving source 30 includes a motor 31 that rotates in one direction, a gear (not shown) fixed to the rotating shaft of the motor 31, and a rotating shaft that fixes a gear (not shown) that reduces the rotational speed of the motor 31. 32 and the link mechanism 40 are combined. Here, the rotating shaft 32 to which the gear that reduces the rotational speed of the motor 31 is fixed is also referred to as the rotating shaft 32 of the motor 31.

  The motor 31 is a servo motor capable of controlling the rotation speed so as to accelerate the liquid supply arm 22 in the reversal operation region of the liquid supply nozzle 21. Specifically, it rotates at a rotation speed as shown in FIG.

  That is, as shown in FIG. 4A, the motor 31 is configured so that the liquid supply nozzle 21 moves in the intermediate portion of the transport belt 11, that is, the rotation shaft 32 of the motor 31 is about 30 ° to 160 °. Between the rotation region 32, that is, the rotation axis 32 of the motor 31 is between 0 ° and about 30 °, between about 170 ° and about 220 °, and between about 350 ° and 0 °. Rotates close to a uniform acceleration or uniform acceleration. The motor 31 is fixed on the base 33 so that the installation position can be finely adjusted.

  As shown in FIG. 3, the link mechanism 40 is connected to a driving crank 41 fixed to the rotating shaft 32, a driven crank 42 fixed to the swinging shaft 23, and the leading ends of both cranks 41 and 42. And a tie rod 43. That is, the proximal end portion of the tie rod 43 is connected to the distal end portion of the driving crank 41, and the distal end portion of the tie rod 43 is connected to the distal end portion of the driven crank 42.

  In FIG. 3, the link mechanism 40 is not seen from above, but is drawn so that the drive crank 41 can be seen above the motor 31 for easy understanding.

  Since the distal end portion of the driving crank 41 rotates in one direction due to the rotation of the motor 31, the proximal end portion of the tie rod 43 also rotates in one direction. However, since the distal end portion of the tie rod 43 is connected to the distal end portion of the driven crank 42 and the proximal end portion of the driven crank 42 is fixed to the swing shaft 23, the distal end portion of the tie rod 43 and the driven portion are driven. The tip of the crank 42 reciprocally swings at a constant angle with the swing shaft 23 as a fulcrum. Therefore, the swing shaft 23 also reciprocally swings (oscillates) at a fixed angle, and the liquid supply arm 22 also rotates at a fixed angle (70 ° between approximately 11 o'clock and 7 o'clock on the clock face in FIG. 2). Swing back and forth.

  Assume that the rotation angle of the motor shaft is set as shown in FIG. 4C at each angle as shown in FIG. In this figure, for example, when the driven crank 42 moves 35 ° forward, the motor shaft rotation angle is set to about 86 °, and when the driven crank 42 moves 70 ° forward, the motor shaft rotation angle is set to 180 °. At such a motor shaft rotation angle, the motor 31 rotates at a speed as shown in FIG.

  That is, in the region where the driven crank 42 is reversed, around 0 ° and around 70 °, in other words, when the motor shaft rotation angle is 0 ° to about 10 ° and about 170 ° to about 200 °, the motor 31 Rotate faster than angle. Further, the motor 31 is controlled so that the region where the driven crank 42 reverses from the forward movement to the backward movement rotates slightly faster than the region where the driven crank 42 reverses from the backward movement to the backward movement.

  The driven crank 42 is attached with load means 44 for gradually accelerating the liquid supply arm 22 in the reversal region of the liquid supply nozzle 21 after the liquid supply arm 22 gradually decelerates and reverses. The load means 44 is constituted by, for example, a tension spring 44 that is stretched between the intermediate portion of the driven crank 42 and the base 33 to which the motor 31 is fixed and other portions to be hooked.

  As shown in FIG. 3A, the tension spring 44 is at one reversal position (hereinafter referred to as “top dead center”) A in which the driving crank 41 faces the 12 o'clock direction on the dial of the watch. As shown in FIG. 3 (c), it extends most and contracts most at the other reverse position (hereinafter referred to as "bottom dead center") B where the driving crank 41 faces the 6 o'clock direction on the dial of the watch. To do. However, even if the tension spring 44 contracts most at the bottom dead center B, it still has an expansion / contraction force that can contract. Such a tension spring 44 prevents backlash of the gear fixed to the rotating shaft 32 of the motor 31, and the driven crank 42 gradually decelerates and accelerates around the top dead center A and the bottom dead center B.

  In addition, in the vacuum container 10, in order to produce the raw material applied on the conveyor belt 11 into a band-like solid, constant rate drying is performed from the upstream side (right side in FIG. 1A) to the downstream side of the conveyor belt 11. A zone, a decreasing rate drying zone, and a cooling zone are sequentially arranged (see FIG. 5). Further, a pre-crusher (not shown) is provided at the downstream end of the conveyor belt 11 for cutting the strip-shaped solid material into predetermined lengths to produce a plate-shaped solid material. A main crusher (not shown) for pulverizing the cut plate-like solid material into granules is disposed in the lower vacuum vessel 10.

  This liquid supply dispersion device is configured as described above. Next, a process for producing granules from raw materials will be described.

  In this liquid supply dispersion device, raw materials are supplied onto the conveyor belt 11 from a liquid supply nozzle 21 attached to the tip of a liquid supply arm 22. As the transport belt 11 travels at a low speed and the liquid supply nozzle 21 reciprocally swings, the raw material is applied onto the transport belt 11 in a circular zigzag pattern with a width slightly narrower than the width of the transport belt 11. The

  That is, as shown in FIGS. 3A, 3B, and 3C, the driven crank 41 rotates by the tie rod 43 while the driving crank 41 rotates counterclockwise and moves forward from the top dead center to the bottom dead center. The tip end side of the driven crank 42 is pushed in an arc shape by the tie rod 43 while the tip end side is pulled in an arc shape and moved backward from the bottom dead center to the top dead center.

  The moving speed of the tip of the driving crank 41 in the direction connecting the driving crank 41 and the driven crank 42 (hereinafter referred to as “Y direction”) is assumed to be top dead center if the driving crank 41 moves at a uniform speed. Around the position of the bottom dead center, the speed in the Y direction is lower than in other positions, and the liquid supply arm 22 is decelerated in the inversion region.

  However, in this liquid supply dispersion device, a servo motor is used as the motor 31, and the liquid supply arm 22 in the reversal area is at a speed of 1/10 of the intermediate area while being at an angle of 1/10 of the intermediate area. Reverses quickly by rotating. Therefore, the driving crank 41 and the driven crank 42 move at a constant speed in the Y direction.

  Furthermore, when the liquid supply arm 22 is reversed, the tension spring 44 changes the state of the load on the rotary shaft 32 of the motor 31. That is, when the driven crank 42 is pushed back by the tie rod 43 at the top dead center A, the tension spring 44 is pulled and contracted, so that the driven crank 42 is forcibly returned and, conversely, the driven crank 42 When 42 is pulled back to the tie rod 43 at the bottom dead center B and then returned, the tension spring 44 contracts and then expands. Therefore, the driven crank 42 does not reverse in an instant but gradually reverses. Invert.

  In this way, the raw material flowing down from the liquid supply nozzle 21 is not supercharged on the endless belt in the reversal region. Accordingly, the raw material is applied to the transport belt 11 with a uniform thickness on both the center line side and the reverse region.

  And this raw material is shape | molded by the constant rate drying zone, a rate-of-decrease drying zone, and a cooling zone, and is shape | molded by the strip | belt-shaped solid substance of uniform thickness also in the width direction. This strip-shaped solid is cut into a predetermined length by a pre-crusher, and is formed into a plate-shaped solid part, and then pulverized by a main crusher to produce a granule. This granule has a uniform quality because the band-like solid is formed to have a uniform thickness.

  Further, when the liquid supply arm 22 is reversed, the state of the load on the rotating shaft 32 of the motor 31 is changed by the tension spring 44, so that backlash of the gear fixed to the rotating shaft 32 of the motor 31 can be prevented. . Further, since the liquid supply arm 22 reciprocally swings by the link mechanism 40 and the motor 31 rotates in a certain direction, acceleration and torque do not increase in the reverse operation region. Furthermore, the motor 31 can individually perform acceleration / deceleration control in accordance with characteristics such as the viscosity of the raw material and the expansion coefficient during drying.

  Note that the present invention can be variously modified without being limited to the above embodiment. For example, the liquid supply dispersion device according to the present invention may be configured such that the transport belt 11 is one stage and one liquid supply nozzle 21 is attached to the tip of one liquid supply arm 22. Further, the load means 44 is not limited to the tension spring 44.

DESCRIPTION OF SYMBOLS 1 ... Raw material 2 ... Solid strip 3 ... Plate-like solid 10 ... Vacuum container 11 ... Conveyor belt 21 ... Liquid supply nozzle 22 ... Liquid supply arm 23 ... Oscillating shaft 23a ... Base end portion 30 …… Drive source 31 …… Motor 32 …… Rotating shaft 41 …… Drive crank 42 …… Drive crank 43 …… Tie rod 44 …… Spring as a load means (tension spring)

Claims (3)

An endless transport belt is placed in the vacuum container, and an oscillating shaft with the base end projecting out of the vacuum container is erected between the upstream end of the transport belt and the vacuum container, and the liquid supply nozzle is at the tip. The base end of the liquid supply arm attached to the shaft is fixed to the swing shaft, and a driving source for reciprocally swinging the liquid supply arm and the liquid supply nozzle around the swing shaft is the base end of the swing shaft. A liquid supply dispersion apparatus provided,
The driving source includes a motor rotating in one direction, a driving crank fixed to a rotating shaft of the motor, a driven crank fixed to a base end portion of the swing shaft, and a leading end portion of the driving crank and a driven shaft. A tie rod having a proximal end and a distal end connected to the distal end of the crank ,
The liquid supply dispersion device, wherein the motor is a servo motor capable of controlling a rotation speed by a motor shaft rotation angle so as to accelerate the liquid supply arm in a reversal operation region of the liquid supply nozzle .   The load means for gradually accelerating after the liquid supply arm is gradually and slowly decelerated and reversed in the reversal operation region of the liquid supply nozzle is attached to the driven crank. The liquid supply dispersion apparatus as described. 3. The motor according to claim 2, wherein the rotational speed of the motor is controlled slightly faster in a region where the driven crank is reversed from the forward movement to the backward movement than in a region where the driven crank is reversed from the backward movement to the backward movement . Liquid supply dispersion device.

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