JP6849752B2 - Foreign matter separation jig and powder flow device equipped with it - Google Patents

Description

The present invention relates to a foreign matter separating jig for separating foreign matter from powder flowing in a fluidizing tank, and a powder fluidizing device including the jig.

A coating process is known in which a coating target portion of a work is immersed in powder flowing in a flow tank, and the powder is fused to the coating target portion to form a coating film. Here, if foreign matter is mixed in the powder, the coating film may contain this foreign matter. When such a situation occurs, for example, a portion of the coating film containing a foreign substance swells, making it difficult to make the thickness substantially uniform. Further, when the foreign matter falls off from the coating film, a dropout mark is formed on the coating film.

Patent Document 1 proposes to provide a filter in the flow tank in order to avoid causing such a defect. That is, when the powder is flowed from the lower end to the upper end of the inclined filter, foreign matter is trapped on the filter during this flow, while the powder having a particle size smaller than the size of the filter passes through the filter. To do. The powder from which the foreign matter has been separated in this way rises in the flow tank and is used for painting.

According to the description of Patent Document 1, the captured foreign matter is discharged to the outside of the flow tank by overflow.

Japanese Unexamined Patent Publication No. 2018-23957 (see in particular, paragraphs [0021] to [0026] and FIGS. 1 to 3).

In the technique described in Patent Document 1, when foreign matter or large-diameter powder is deposited on the filter, small-diameter powder suitable for coating is deposited on the foreign matter or large-diameter powder. As described above, since the foreign matter and the like on the filter are discharged by the overflow, the small-diameter powder is discharged together with the foreign matter and the large-diameter powder. This amount results in powder loss.

In addition, since the filter is arranged at the bottom of the flow tank, the flow status of the powder is affected, for example, the flow of the powder becomes unstable while foreign matter or the like is being conveyed due to overflow. It reaches.

Furthermore, the filter does not have a structure that orbits the entire circumference of the flow tank. Since foreign matter cannot be captured in the portion where the filter does not exist, it is necessary to flow the powder so as to sequentially pass through the filter in order to remove the foreign matter from the entire powder. Therefore, it takes a long time to remove the foreign matter.

The present invention has been made to solve the above-mentioned problems, and includes a foreign matter separating jig capable of efficiently removing foreign matter and avoiding loss of powder, and a jig for separating the foreign matter. It is an object of the present invention to provide a powder flow device.

In order to achieve the above object, according to one embodiment of the present invention, from a powder that is provided in a flow tank having a substantially cylindrical shape and an open end in the height direction and flowing in the flow tank. A foreign matter separation jig that separates foreign matter.
A powder passage through which the foreign matter and the powder can pass is formed on the inner peripheral side.
While the powder can pass through, the foreign matter is captured, and a trapping portion that circulates around the powder passage is provided on the outer peripheral side.
Moreover, a foreign matter separating jig provided with a held portion held in the flow tank is provided.

According to another embodiment of the present invention, there is provided a powder flow device including a flow tank provided with the above-mentioned foreign matter separation jig.

According to the present invention, a powder passage is formed on the inner peripheral side, and a catching portion that orbits the powder passage so as to surround the powder passage is provided on the outer peripheral side of the powder passage. Therefore, in the flow tank, for example, the powder and the foreign matter that have passed through the powder passage are flown by flowing the powder so as to rise from the lower side of the inner peripheral side toward the opening end side and further toward the outer peripheral side. Can be easily flowed (moved) to the catching portion on the outer peripheral side.

Then, since the foreign matter is trapped by the trapping portion, the powder and the foreign matter are separated. That is, foreign matter can be removed from the powder without overflowing the powder. Since the catching portion is provided so as to go around, the foreign matter is removed at the same time over substantially the entire foreign matter separating jig. Therefore, the loss of the powder can be avoided and the foreign matter can be efficiently removed.

It is the schematic perspective view of the stator which is the work which forms a coating film. It is a front view of the main part of the stator in which the insulating resin layer as a coating film is formed. It is a schematic vertical sectional view of the powder flow apparatus which concerns on embodiment of this invention. It is a schematic side sectional view of the jig for separating foreign matter which constitutes a powder flow apparatus. It is a schematic plan view of the jig for separating foreign matter. It is a schematic horizontal sectional view of the flow tank which shows the flow direction of a powder. It is a schematic side view which shows typically the flow direction of the powder in the foreign matter separation jig. It is a schematic vertical sectional view which showed the state which a part of the stator was immersed in the powder in a flow tank.

Hereinafter, the foreign matter separating jig according to the present invention will be described as a suitable embodiment in relation to a powder fluidizing device provided with a fluidizing tank provided with the foreign matter separating jig, and the attached drawings will be referred to. This will be described in detail.

First, the work and the part to be painted will be described. In the present embodiment, the stator 10 whose schematic perspective view is shown in FIG. 1 is selected as the work to be coated (in other words, to form a coating film). The stator 10 constitutes a rotary electric machine used as an electric motor or a generator together with a rotor (not shown).

The stator 10 has a cylindrical core 12 and a coil 14. The core 12 in this is composed of, for example, a plurality of annular electromagnetic steel plates laminated in the height direction. Further, a plurality of slots 16 penetrating the core 12 along the height direction are formed in the core 12 at intervals in the circumferential direction. A part of the coil 14 is inserted into the slot 16.

Specifically, the coil 14 is configured by electrically connecting a plurality of segments 20 arranged in an annular shape along the circumferential direction of the core 12. Each segment 20 has a pair of leg portions 22 and a curved portion 24 that connects the leg portions 22 to each other. The pair of legs 22 are inserted into the different slots 16 from the upper end surface side of FIG. 1 of the core 12, and project from the lower end surface side.

The tip of the leg 22 protruding from one slot 16 is joined to the tip of another leg 22 protruding from another slot 16, for example, by welding. The coil 14 is formed by electrically connecting the plurality of segments 20 to each other via the joint portion 26 formed in this way.

If the joint portion 26 comes into contact with another joint portion 26 or the like, there is a concern that a short circuit may occur. In order to avoid this, as shown in FIG. 2, the joint portion 26 is coated with the insulating resin layer 28 as a coating film.

Next, the powder flow device for forming the insulating resin layer 28 will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the powder flow device 30 includes a vibration applying mechanism 32 and a flow tank 34 having an open end with an open upper end and a bottomed cylindrical shape. The vibration applying mechanism 32 in this includes a vibration motor 36 and a transmission rod 38 that transmits the vibration generated by the vibration motor 36 to the flow tank 34. The vibration motor 36 is arranged further below the support plate 40 that supports the flow tank 34. Further, the transmission rod 38 extends upward from the vibration motor 36 and abuts or separates from the radial center of the flow tank 34 through the passage hole 41 formed in the support plate 40. .. By repeating this contact or separation, the flow tank 34 vibrates in the height direction (axial direction), the radial direction, and the circumferential direction.

A rubber damper 42 is inserted between the support plate 40 and the flow tank 34. The damper 42 absorbs the vibration of the flow tank 34. Therefore, it is avoided that the support plate 40 vibrates together with the flow tank 34. The damper 42 is provided so as to surround the transmission rod 38.

A dispersion plate 44 and a perforated plate 46 are inserted along the radial direction in the middle of the flow tank 34 in the axial direction. The dispersion plate 44 and the perforated plate 46 are made of a porous material through which compressed air can pass while suppressing the passage of the resin powder 50 (powder). The dispersion plate 44 and the perforated plate 46 are positioned and fixed to the flow tank 34 in a state of being separated from each other at predetermined intervals by externally fitting the outer fitting ring 51. It is not particularly necessary to provide the dispersion plate 44, and this may be omitted.

The dispersion plate 44 and the perforated plate 46 divide the flow tank 34 into three inner chambers 52, 54, and 56. That is, in the flow tank 34, the air introduction chamber 52, the air dispersion chamber 54, and the flow chamber 56 are defined in this order from the bottom. A compressed air supply source (for example, an air pump) (not shown) is connected to the lowermost air introduction chamber 52 via a supply pipe 58. That is, the compressed air supplied from the compressed air supply source diffuses in the air introduction chamber 52 and then rises by being pressed by the compressed air further supplied to the air introduction chamber 52. The raised compressed air passes through the holes of the dispersion plate 44 and the air dispersion chamber 54 toward the perforated plate 46 in a dispersed state, and passes through the holes of the perforated plate 46 to pass from below the flow chamber 56. It is distributed into the flow chamber 56.

The resin powder 50 as a powder is housed in the flow tank 34. The resin powder 50 is a starting material for the insulating resin layer 28.

A foreign matter separating jig 60 is detachably provided with respect to the flow tank 34 in the vicinity of the upper opening of the flow tank 34. The foreign matter separating jig 60 is for removing the foreign matter UP (see FIG. 7) in the resin powder 50, and has a substantially disk shape as shown in FIGS. 4 and 5. A tool main body 62, a sleeve 64 provided on the jig main body 62, and a mesh filter 66 (capturing portion) that circulates around the sleeve 64 are provided. Note that FIG. 4 corresponds to a cross-sectional view taken along the line IV-IV in FIG.

The jig main body 62 includes a bottom wall portion 68, a held portion 70 that rises substantially vertically from the outer peripheral edge portion of the bottom wall portion 68 and orbits, and an annular shape that is bent outward in the radial direction from the held portion 70. It has a tab portion 72. An insertion hole 74 for inserting the sleeve 64 is formed at the radial center of the bottom wall portion 68. Further, in the vicinity of the insertion hole 74, a plurality of arc-shaped passage ports 76 (in this case, four) are opened so as to surround the insertion hole 74.

A powder passage 78 is formed in the sleeve 64 along the height direction. The powder passage 78 is a through-passage that includes a lower opening 78a facing the bottom of the flow chamber 56 and an upper opening 78b facing the upper end of the opening, and has a circular cross section. As shown in FIG. 4, the inner diameter of the powder passage 78 increases in a tapered shape from the lower opening 78a toward the upper opening 78b. That is, the inner diameter (in other words, the opening width) of the lower opening 78a is set smaller than that of the upper opening 78b.

A large-diameter flange 80 is provided at the upper end of the sleeve 64. The outer diameter of the flange 80 is larger than that of the insertion hole 74, so that the flange 80 is dammed by the jig body 62. That is, the flange 80 serves as a retainer for the sleeve 64 from coming out of the insertion hole 74. Further, a bolt insertion hole 82a is formed in the flange 80, and a nut 86 is screwed into the bolt 84 passed through the bolt insertion hole 82a. As a result, the sleeve 64 is positioned and fixed to the jig body 62.

The mesh filter 66 has a ring shape, and its inner peripheral side is sandwiched between the jig body 62 and the flange 80. That is, the mesh filter 66 orbits below the flange 80 so as to surround the powder passage 78. Further, the installation depth D (see FIG. 3) of the mesh filter 66 from the open upper end of the flow tank 34 is preferably set to 10 to 20 mm.

The mesh filter 66 is supported by a portion of the bottom wall portion 68 located between the passage ports 76 and extending radially from the insertion hole 74. Further, the mesh filter 66 is covered with a holding frame body 96 having an inner annular portion 90, four linearly shaped portions 92, and an outer annular portion 94 (see FIG. 5). Since the inner ring portion 90 is sandwiched between the sleeve 64 and the mesh filter 66, it cannot be visually recognized in a plan view.

The linear portion 92 extends radially from the insertion hole 74 and overlaps above the mesh filter 66 at a position where one passage port 76 is substantially equally divided. A bolt insertion hole 82b is formed in the linear shape portion 92 and the outer ring portion 94, and a bolt insertion hole 82c is formed at a position of the mesh filter 66 corresponding to the position of the bolt insertion hole 82b. A nut 86 is screwed into each of the bolts 84 passed through the bolt insertion holes 82b and 82c and the bolt insertion holes 82d formed in the bottom wall portion 68 on the lower surface side of the bottom wall portion 68 to form a mesh. The filter 66 is sandwiched between the bottom wall portion 68 and the holding frame body 96.

As shown in FIG. 4, the annular tab portion 72 is provided with a bolt insertion hole 82e, and the block member 100 is held on the lower surface of the annular tab portion 72 by the bolt 84 passed through the bolt insertion hole 82e. .. A screw hole 102 is formed through the block member 100 so as to have the same axis as the diameter of the bottom wall portion 68. A stud bolt 104 as a holding body is slidably inserted into the screw hole 102. When the operator twists the stud bolt 104, the stud bolt 104 moves forward or backward. That is, the stud bolt 104 approaches or separates from the held portion 70.

The foreign matter separating jig 60 and the powder flow device 30 according to the present embodiment are basically configured as described above, and the effects thereof will be described next.

In order to coat (paint) the joint portion 26 between the segments 20 of the stator 10 with the insulating resin layer 28, first, the resin powder 50 is housed in the flow chamber 56 of the flow tank 34. After that, as shown in FIG. 3, a foreign matter separating jig 60 is attached to the upper end of the opening of the flow tank 34. At this time, the upper end of the flow tank 34 is inserted between the held portion 70 and the stud bolt 104. Specifically, the held portion 70 is attached to the inner peripheral wall of the fluidized tank 34, and the stud bolt 104 is opposed to the outer peripheral wall of the fluidized tank 34.

In this state, the stud bolt 104 is screwed to advance the stud bolt 104 toward the flow tank 34 side. As a result, the upper end of the flow tank 34 is firmly sandwiched between the stud bolt 104 and the held portion 70. As described above, in the present embodiment, the stud bolt 104 can be approached or separated from the flow tank 34. Therefore, the foreign matter separation jig 60 can be stably positioned and fixed to the flow tank 34 as compared with the case where the foreign matter separation jig 60 is simply hooked on the upper end of the flow tank 34.

Further, by adjusting the position of the stud bolt 104, the foreign matter separating jig 60 can be attached to the flow tank 34 having various thicknesses. That is, the foreign matter separating jig 60 has excellent versatility.

With the foreign matter separation jig 60 attached to the flow tank 34 in this way, the vibration motor 36 is then urged. Along with this, the transmission rod 38 repeatedly abuts and separates from the radial center of the flow tank 34. As a result, the flow tank 34 vibrates in the axial direction, the radial direction, and the circumferential direction. At this time, the damper 42 inserted between the support plate 40 and the flow tank 34 suppresses the transmission of vibration to the support plate 40. As a result, the support plate 40 is prevented from vibrating together with the flow tank 34.

Compressed air is supplied from the compressed air supply source substantially at the same time as the vibration motor 36 is urged. The compressed air circulates through the supply pipe 58 and is introduced into the air introduction chamber 52. Since the air introduction chamber 52 has a large area and a large volume as compared with the supply pipe 58, the flow velocity of the compressed air decreases. As described above, the air introduction chamber 52 is a buffer unit for adjusting the flow velocity of the compressed air. The compressed air in the air introduction chamber 52 is dispersed by passing through the holes of the dispersion plate 44, the air dispersion chamber 54, and the pores of the perforated plate 46, and is supplied into the flow chamber 56. The amount of compressed air supplied is set large enough to increase the foreign matter UP and the large-diameter powder contained in the resin powder 50.

According to the diligent study of the present inventor, when the flow tank 34 is vibrated as described above, the amplitude and acceleration of the radial and circumferential vibrations are substantially the same between the radial center side and the outer peripheral side. On the other hand, it was found that in the axial direction (height direction), the amplitude and acceleration of the vibration increase from the radial center side to the outer peripheral side of the flow tank 34. Under such a situation, the bulk density of the resin powder 50 on the bottom side of the outer circumference tends to be larger than that on the center side in the radial direction. That is, the bulk density of the resin powder 50 is relatively large or small on the outer peripheral side and the inner peripheral side of the flow chamber 56.

Therefore, when the amount of compressed air supplied to the flow chamber 56 via the perforated plate 46 is substantially equal, the resin powder 50 is less likely to flow on the outer peripheral side of the flow chamber 56 than on the radial center side. This is because, as described above, the bulk density of the resin powder 50 is larger on the outer peripheral side than on the radial center side. In other words, the resin powder 50 flows relatively easily on the radial center side. Therefore, as shown by the arrow P1 in FIGS. 3 and 6, the resin powder 50 in the flow chamber 56 rises from the lower side of the radial center side (inner peripheral side) toward the upper end portion opened, and then rises. It flows radially toward the outer circumference. The resin powder 50 then settles downward on the outer peripheral side (see FIG. 3).

Here, the resin powder 50 is a powder formed on the sleeve 64 constituting the foreign matter separation jig 60 in the process of rising from the lower side of the radial center side (inner peripheral side) toward the upper end portion opened. Pass through passage 78. Since the resin powder 50 rises on the radial center side, the lower opening 78a of the powder passage 78 serves as an inlet for the resin powder 50, and the upper opening 78b serves as an outlet. That is, the lower opening 78a is the opening on the upstream side of the resin powder 50 in the flow direction, while the upper opening 78b is the opening on the downstream side in the flow direction. When the resin powder 50 contains the foreign matter UP, the foreign matter UP also passes through the powder passage 78 together with the resin powder 50.

As described above, the inner diameter of the lower opening 78a is smaller than that of the upper opening 78b. That is, the opening width of the outlet on the downstream side in the flow direction of the resin powder 50 is larger than that on the inlet on the upstream side in the flow direction. Therefore, in the powder passage 78, the flow velocity of the resin powder 50 decreases from the lower opening 78a (upstream side) to the upper opening 78b (downstream side). That is, the resin powder 50 in the powder passage 78 is pressed from below by the resin powder 50 having a large flow velocity. As a result, the resin powder 50 and the foreign matter UP in the powder passage 78 are prevented from flowing back (descending).

As schematically shown in FIG. 7, the resin powder 50 and the foreign matter UP that have passed through the powder passage 78 ride on the flange 80 of the sleeve 64 and then flow down onto the upper surface of the mesh filter 66. Here, the flange 80 is located above the mesh filter 66. It is difficult for the resin powder 50 and the foreign matter UP flowing on the mesh filter 66 to get over the step with the flange 80. Therefore, it is prevented that the resin powder 50 and the foreign matter UP on the mesh filter 66 return to the powder passage 78 and further descend from the powder passage 78.

Since the foreign matter separation jig 60 is held in the flow tank 34, the foreign matter separation jig 60 vibrates integrally with the flow tank 34. The degree of vibration of the flow tank 34 increases as the distance from the damper 42 increases. Therefore, the outer edge of the upper end of the flow tank 34 separated from the damper 42 and the foreign matter separating jig 60 attached to the outer edge of the upper end vibrate greatly. Then, the resin powder 50 on the mesh filter 66 swings with this vibration.

At this time, the small-diameter powder having a small particle size passes through the mesh of the mesh filter 66 and the passage port 76 and returns to the flow tank 34. On the other hand, large-diameter powder or foreign matter UP having a particle size larger than that of the mesh filter 66 stays on the mesh filter 66. That is, the mesh filter 66 serves as a sieve and removes the large-diameter powder and the foreign matter UP from the small-diameter powder suitable for forming the insulating resin layer 28. Since the entire amount of the small-diameter powder returns to the flow chamber 56, loss of the small-diameter powder is avoided.

Further, since the foreign matter separating jig 60 vibrates greatly, the small-diameter powder passes through the mesh filter 66 relatively easily. Further, since the mesh filter 66 orbits the entire circumference of the flow tank 34, it is possible to process a large amount of the resin powder 50 at the same time. For the above reasons, the separation of the large-diameter powder and the foreign matter UP from the small-diameter powder proceeds efficiently.

In this way, the powder passage 78 is formed on the inner peripheral side, and the mesh filter 66 (capturing portion) that circulates around the powder passage 78 is provided on the outer peripheral side of the powder passage 78. As a result, the foreign matter UP mixed in the resin powder 50 that rises from the lower side of the radial center side (inner peripheral side) toward the upper part (opening end) side and further flows toward the outer peripheral side, and the large diameter The powder can be easily removed.

Further, when the installation depth D of the mesh filter 66 is 10 to 20 mm, the amount of the resin powder 50 that passes through the powder passage 78 and flows on the mesh filter 66 and the resin powder that passes through the mesh filter 66. The amount of 50 is roughly balanced. Therefore, it is possible to prevent the resin powder 50 from accumulating on the mesh filter 66 and the deposited resin powder 50 from overflowing from the flow chamber 56.

After a predetermined time (for example, about several minutes) has elapsed, the vibration motor 36 is temporarily defeated and the supply of compressed air is stopped. That is, the vibration of the flow tank 34 and the foreign matter separation jig 60 and the flow of the resin powder 50 by the compressed air are stopped. In this state, the stud bolt 104 is screwed in the direction retracting from the outer peripheral wall of the flow tank 34, the flow tank 34 is released from the pinch between the stud bolt 104 and the held portion 70, and the foreign matter separation jig 60 is released from the flow tank. Remove from 34.

By this removal, large-diameter powder and foreign matter UP are discharged from the fluidized tank 34. As described above, according to the present embodiment, the foreign matter UP is not transferred from the mesh filter 66 while the resin powder 50 is being sieved. Therefore, it is avoided that the smooth flow of the resin powder 50 is hindered.

While removing the foreign matter UP as described above, the stator 10 is preheated by a preheater (not shown). Further, when the preheating is completed, the vibration motor 36 is re-energized and the supply of compressed air is restarted. As a result, the resin powder 50 in the flow chamber 56 begins to reflow.

The resin powder 50 in the flow chamber 56 is a small-diameter powder from which foreign substances UP and large-diameter powder have been removed. Therefore, it is not particularly necessary to supply the compressed air in an amount sufficient to raise the foreign matter UP and the large-diameter powder. That is, the amount of compressed air supplied at this time may be set smaller than the amount of compressed air supplied when removing the foreign matter UP.

Next, the preheated stator 10 is conveyed using a suspension jig or a transfer device, and the stator 10 is immersed in the flowing resin powder 50 as shown in FIG. Of course, at this time, the joint portion 26 is set downward, and the stator 10 is lowered until the lower end surface of the core 12 is buried in the resin powder 50. At this time, the resin powder 50 in contact with the stator 10 and the resin powder 50 in the vicinity thereof are melted by transferring the heat of the stator 10. The melt covers the lower end surface of the core 12 together with the joint 26.

Next, the stator 10 is raised under the action of the suspension jig or the transport device, and the stator 10 is pulled up from the resin powder 50. After that, the melt is cooled and cured to form the insulating resin layer 28 shown in FIG.

When the foreign matter UP is, for example, a metal piece, the insulating resin layer 28 containing no metal piece can be formed by the above-mentioned foreign matter removing treatment. That is, it is possible to obtain the insulating resin layer 28 from which the concern that a short circuit may occur via the metal piece has been eliminated. Further, the thickness of the insulating resin layer 28 becomes substantially uniform because swelling due to the inclusion of foreign matter UP is avoided. Further, the concern that a dropout mark is formed due to the foreign matter UP falling off is also dispelled.

The resin powder 50 remaining in the flow chamber 56 is the one in which the foreign matter UP and the large-diameter powder have already been removed by the above-mentioned foreign matter removing treatment. Therefore, thereafter, the work of forming the insulating resin layer 28 can be repeated using the resin powder 50 in the flow chamber 56 without performing the foreign matter removing treatment. That is, the foreign matter removing process may be carried out at regular intervals.

Moreover, the time required for one foreign matter removal process is about several minutes to a dozen minutes. Further, when removing the foreign matter separating jig 60 from the flow tank 34, only a simple operation of screwing the stud bolt 104 is performed, and the time required for this is extremely short. Therefore, the time required for forming the insulating resin layer 28 does not increase by performing the foreign matter removing treatment.

The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

For example, instead of forming the powder passage 78 in the sleeve 64, a passage hole is formed on the inner peripheral side (typically, the center in the radial direction) of the jig main body 62, and the passage hole is formed through the passage hole. The resin powder 50 may be allowed to flow toward the mesh filter 66 side.

When the diameter (opening width) of the powder passage 78 or the passage hole is larger than the diameter of the core 12, the core 12 is powdered without removing the foreign matter separation jig 60 from the flow tank 34. After passing through the passage 78 and the passage hole, it may be immersed in the resin powder 50 in the flow chamber 56.

Further, when discharging the foreign matter UP from the flow tank 34, the bolt 84 may be relaxed to remove the holding frame 96 from the mesh filter 66, and further, the mesh filter 66 may be removed from the jig body 62. By carrying out the removed mesh filter 66 from the flow tank 34, the foreign matter UP is discharged from the flow tank 34.

10 ... Stator 12 ... Core 14 ... Coil 20 ... Segment 22 ... Leg 26 ... Joint 28 ... Insulating resin layer 30 ... Powder flow device 32 ... Vibration applying mechanism 34 ... Flow tank 36 ... Vibration motor 38 ... Transmission rod 42 ... Damper 50 ... Resin powder 52 ... Air introduction chamber 54 ... Air dispersion chamber 56 ... Flow chamber 60 ... Foreign matter separation jig 62 ... Jig body 64 ... Sleeve 66 ... Mesh filter (capture part) 70 ... Holding part 76 ... Passage port 78 ... Powder passage 78a ... Lower opening 78b ... Upper opening 80 ... Flange 96 ... Holding frame 100 ... Block member 102 ... Screw hole 104 ... Stud bolt UP ... Foreign matter

Claims (8)

A foreign matter separation jig provided in a fluidized tank having a substantially cylindrical shape and having an open end at the upper end in the height direction to separate foreign matter from the powder flowing in the fluidized tank.
A powder passage through which the foreign matter and the powder can pass is formed on the inner peripheral side.
While the powder can pass through, the foreign matter is captured, and a trapping portion that circulates around the powder passage is provided on the outer peripheral side.
A foreign matter separation jig provided with a held portion held in the flow tank. In the jig according to claim 1, the powder passage has a larger opening width of the outlet on the downstream side in the flow direction than the opening width of the inlet on the upstream side in the flow direction of the powder. Ingredients. The jig according to claim 2, further comprising a sleeve having the powder passage formed at the end on the outlet side and having a flange at the end on the outlet side, and a foreign matter separation treatment in which the catching portion is located below the flange. Ingredients. The jig according to any one of claims 1 to 3, wherein the held portion is attached to the side wall portion of the open end. The jig according to claim 4 includes a holding body that can approach or separate from the held portion and that approaches the held portion and sandwiches the side wall portion together with the held portion. Foreign matter separation jig. The jig according to any one of claims 1 to 5, wherein the catching portion is arranged at a position having a depth of 10 to 20 mm from the opening end. A powder flow device including a flow tank provided with the foreign matter separation jig according to any one of claims 1 to 6. The powder flow device according to claim 7, further comprising a vibration applying mechanism that vibrates the foreign matter separation jig together with the flow tank.

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