JP2017109828A - Granule discharge valve, granule storage device, and weighing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a granule discharge valve which can efficiently discharge a granule when opened, and can prevent bite of the granule when closed.SOLUTION: A granule discharge valve 30 includes an annular valve seat 31 formed of an elastic body, and a valve element 32 of which a diameter is reduced toward an upper side. When the valve element 32 is arranged in a descending position, at least an inner circumference edge 311 of the valve seat 31 turns downward. Therefore, the granule can be discharged efficiently. On the other hand, when the valve element 32 is arranged in an ascending position, the inner circumference edge 311 of the valve seat 31 reverses a direction to an upside by contact with the valve element 32. Therefore, even when the granule is bitten between the valve seat 31 and the valve element 32 in a process that the valve element 32 ascends, the bitten granule is released to an upside of the valve seat 31 by reversing the direction of the inner circumference edge 311 of the valve seat 31 to the upside. Thereby, bite of the granule can be prevented.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a powder discharge valve that switches between opening and closing of a discharge port that discharges a material consisting of powder or particles (hereinafter referred to as “powder”), and a powder storage that includes the powder discharge valve. The present invention relates to a device and a weighing device provided with the particulate storage device.

  2. Description of the Related Art Conventionally, a valve structure for switching between a state in which powder particles are discharged from a storage tank or a pipe and a state in which discharge of powder particles is stopped is known. The conventional valve structure is described in Patent Documents 1 and 2, for example.

  The valve apparatus of patent document 1 has a valve seat part and a conical valve body which moves up and down. When the valve body is lowered, the valve body is separated from the tapered valve seat (paragraph 0032, FIG. 5). On the other hand, when the valve body is raised, the tapered surface portion of the valve body contacts the tapered valve seat (paragraphs 0034 to 0035, FIG. 6). Moreover, the apparatus of patent document 2 has a ring-shaped packing which has a taper part in an inner edge, and the umbrella-shaped projection valve which contacts a taper part (paragraphs 0017-0018, FIG. 1).

JP 2003-247658 A JP 2006-289532 A

  In this type of valve structure, when the valve is closed during the discharge of the granular material, the granular material may be caught between the valve seat and the valve body. When the granular material is caught between the valve seat and the valve body, gas leakage through the valve is likely to occur, and it is difficult to maintain airtightness on the upstream side and the downstream side of the valve. In addition, it becomes difficult to keep the discharge amount of the granular material strictly constant.

  Regarding the biting of the granular material, paragraph 0035 of Patent Document 1 describes that even if powder or the like bites into the sealing surface, the deterioration of the sealing performance can be avoided by elastic deformation of the O-ring (paragraph). 0035). However, the structure of Patent Document 1 does not prevent the biting of the granular material itself. Patent Document 2 describes that biting can be prevented by inclining the upper surface of the inner peripheral edge of the packing (paragraph 0018). However, in the structure of Patent Document 2, since the entire packing is a flat disk shape, it is considered difficult to efficiently discharge the granular material.

  The present invention has been made in view of such circumstances, and provides a granular material discharge valve that can efficiently discharge granular material when opened and can prevent biting of the granular material when closed. Objective.

  The first invention of the present application includes a valve body whose diameter decreases toward the upper side, a drive mechanism for reciprocating the valve body up and down between an ascending position and a descending position, and the valve disposed at the ascending position. An annular valve seat in contact with the body, wherein the valve seat is formed of an elastic body, and an annular member having a diameter smaller than the maximum diameter of the valve body is formed at the lower center of the valve seat. When the valve body is disposed at the lowered position, the inner circumferential edge faces downward, and when the valve body is disposed at the raised position, a part of the valve body is located at the inner circumferential edge. While passing through the inside, the inner peripheral edge reverses the direction upward by contact with the valve body.

  2nd invention of this application is a granular material discharge | emission valve | bulb of 1st invention, Comprising: The said valve body has a conical outer peripheral surface where a diameter reduces as it goes upwards.

  3rd invention of this application is a granular material discharge valve of 1st invention or 2nd invention, Comprising: The said valve seat has a conical inner peripheral surface and outer peripheral surface which a diameter shrinks as it goes below.

  4th invention of this application is a granular material discharge valve of 3rd invention, Comprising: The upper internal peripheral surface of the said valve seat contacts an annular | circular rigid body.

  A fifth invention of the present application is the particulate discharge valve according to any one of the first to fourth inventions, wherein the drive mechanism is housed inside the valve body.

  6th invention of this application is the granular material discharge valve of any 1 invention from 1st invention to 5th invention, Comprising: The said valve seat is formed with rubber | gum.

  7th invention of this application is a granular material discharge valve of any one invention from 1st invention to 6th invention, Comprising: The said valve body is formed with a metal.

  8th invention of this application is a granular material storage apparatus, Comprising: The storage tank which stores a granular material, and the any one of Claims 1-7 provided in the lower part of the said storage tank. And a particulate discharge valve.

  A ninth invention of the present application is a weighing device, and includes the powder storage device of the eighth invention and a measurement unit that measures the weight of the powder discharged from the powder storage device.

  A tenth invention of the present application is the weighing device according to the ninth invention, wherein the weighing unit measures the weights of a plurality of types of powder particles discharged from the plurality of powder storage devices, respectively, and the weighing unit A mixing unit that mixes a plurality of types of powder particles measured by the above and a tank that stores the powder particles mixed by the mixing unit.

  According to the first to tenth inventions of the present application, even if the granular material is caught between the valve seat and the valve body in the process of raising the valve body, the inner peripheral edge of the valve seat faces upward. Is reversed to release the bitten granular material above the valve seat. Thereby, the biting of a granular material can be prevented. On the other hand, when the valve body is disposed at the lowered position, at least the inner peripheral edge of the valve seat faces downward. For this reason, a granular material can be discharged | emitted efficiently.

  In particular, according to the fourth invention of the present application, only the lower part of the valve seat can be deformed while maintaining the shape of the upper part of the valve seat.

  In particular, according to the fifth aspect of the present invention, it is possible to prevent the granular material flowing around the valve body from coming into contact with the drive mechanism.

  In particular, according to the sixth invention of the present application, when the valve body is arranged at the raised position, high sealing performance can be obtained between the valve body and the valve seat.

It is the figure which showed notionally the structure of the measuring apparatus. It is sectional drawing of a granular material storage apparatus. It is sectional drawing of a granular material storage apparatus. It is a fragmentary sectional view of a granular material storage device. It is a fragmentary sectional view of a granular material storage device. It is sectional drawing of the granular material storage apparatus which concerns on a modification. It is sectional drawing of the granular material storage apparatus which concerns on a modification. It is a fragmentary sectional view of the granular material storage device concerning a modification. It is a fragmentary sectional view of the granular material storage device concerning a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. Configuration of weighing device>
FIG. 1 is a diagram conceptually showing the configuration of a weighing device 100 according to an embodiment of the present invention. The weighing device 100 is a device that measures two types of resin pellets that are powder particles and mixes the resin pellets at a predetermined ratio. As shown in FIG. 1, the weighing device 100 includes two powder body storage devices 1, a weighing unit 2, a mixing unit 3, and a tank 4. The two granular material storage devices 1, the measuring unit 2, the mixing unit 3, and the tank 4 are fixed to a common frame.

  Different types of resin pellets are stored in the two granular material storage devices 1. The weighing device 100 first starts discharging resin pellets from the one granular material storage device 1. The measuring unit 2 measures the weight of the discharged resin pellets using a weight sensor 2a such as a load cell. And if the measurement value of the weight sensor 2a becomes a preset value, the measurement device 100 stops the discharge of the resin pellets from the one granular material storage device 1.

  Subsequently, the weighing device 100 starts discharging the resin pellets from the other granular material storage device 1. The measuring unit 2 measures the weight of the discharged resin pellets using a weight sensor 2a such as a load cell. And if the measurement value of the weight sensor 2a becomes a preset value, the measurement device 10 stops the discharge of the resin pellets from the other granular material storage device 1. Thereby, two types of resin pellets are each weighed to a desired amount.

  The two types of weighed resin pellets are sent from the weighing unit 2 to the mixing unit 3. Then, two types of resin pellets are mixed in the mixing unit 3. Thereby, a mixed material containing two kinds of resin pellets at a predetermined ratio is obtained. The obtained mixed material is stored in the tank 4.

  In addition, the two types of powder particles mixed in the weighing device 100 may not be resin pellets. For example, in the weighing device 100, resin pellets that are powder particles and additives that are powder particles may be mixed. In addition, the types of powder particles measured and mixed in the weighing device 100 may be three or more types. When three or more types of resin pellets are handled, three or more powder body storage devices may be mounted on the weighing device 100. In addition, the weighing device 100 may be a device that only measures one type of granular material.

<2. Configuration of powder storage device>
Then, the structure of the granular material storage apparatus 1 is demonstrated. 2 and 3 are cross-sectional views of the granular material storage device 1. The granular material storage device 1 is a device that stores resin pellets, which are granular materials, in the storage tank 10 and discharges the resin pellets downward as necessary. The powder storage device 1 may be mounted on the weighing device 100 as described above, or may be used for other purposes. As shown in FIGS. 2 and 3, the granular material storage device 1 includes a storage tank 10, a granular material supply unit 20, a granular material discharge valve 30, and a control unit 40.

  The storage tank 10 is a container that stores resin pellets therein. The storage tank 10 has a substantially cylindrical side wall 11, a funnel-shaped bottom part 12 that gradually converges from the lower end of the side wall 11 downward, and a top plate part 13 that covers the upper part of the storage tank 10. The storage tank 10 stores resin pellets in an internal space surrounded by the side wall 11, the bottom portion 12, and the top plate portion 13. The storage tank 10 is formed of a metal such as SUS (stainless steel), for example. As shown in FIGS. 2 and 3, the side wall 11 is provided with a supply port 51 for supplying resin pellets into the storage tank 10. In the center of the bottom portion 12, a discharge port 52 for discharging resin pellets from the storage tank 10 is provided. The top plate 13 is provided with a suction port 53 for sucking out the gas in the storage tank 10.

  The granular material supply unit 20 includes a material supply pipe 21, a gas suction pipe 22, and a filter 23. The material supply pipe 21 extends from the supply port 51 provided in the side wall 11 toward the outside of the storage tank 10. The upstream end of the material supply pipe 21 is connected to a material supply source (not shown). The gas suction tube 22 extends from the suction port 53 provided in the top plate portion 13 toward the outside of the storage tank 10. The downstream end of the gas suction pipe 22 is connected to a blower (not shown).

  When the blower is operated in a state where the discharge port 52 is closed by a granular material discharge valve 30 described later, an air flow from the suction port 53 to the blower is generated inside the gas suction pipe 22. Thereby, the gas in the storage tank 10 is sucked out from the suction port 53, and the inside of the storage tank 10 becomes a negative pressure. As a result, the resin pellets stored in the material supply source are supplied into the storage tank 10 through the material supply pipe 21. The supplied resin pellets are stored in the storage tank 10. The filter 23 prevents the resin pellet supplied into the storage tank 10 from flowing into the gas suction pipe 22. For the filter 23, for example, a punching metal plate is used.

  However, the method for supplying the resin pellets into the storage tank 10 is not necessarily limited to such suction transportation. For example, the upper part of the storage tank 10 may be opened, and the operator may directly input the resin pellets into the storage tank 10.

  The particulate discharge valve 30 is a mechanism for switching opening and closing of the discharge port 52 provided in the lower part of the storage tank 10. As shown in FIGS. 2 and 3, the particulate discharge valve 30 includes a valve seat 31, a valve body 32, and a drive mechanism 33.

  The valve seat 31 is an annular member attached to the lower part of the storage tank 10. The valve seat 31 is formed of an elastic body such as rubber. Specifically, for example, polyurethane rubber can be used as the material of the valve seat 31. The entire valve seat 31 of this embodiment is formed in a funnel shape. That is, both the inner peripheral surface and the outer peripheral surface of the valve seat 31 have a conical shape whose diameter decreases as it goes downward. The upper end portion of the valve seat 31 is fixed to the bottom portion 12 of the storage tank 10. Therefore, the inner peripheral surface of the upper part of the valve seat 31 is in surface contact with the outer peripheral surface of the bottom 12 of the storage tank 10.

  Further, the valve seat 31 has an annular inner peripheral edge 311 in the lower center. The diameter of the inner peripheral edge 311 is smaller than the maximum diameter of the valve body 32 described later. A circular hole 310 is provided inside the inner peripheral edge 311.

  The valve body 32 is a member that moves up and down below the valve seat 31. As shown in FIGS. 2 and 3, the valve body 32 of the present embodiment includes a cone portion 321 and a cylindrical portion 322. The cone part 321 has a conical outer peripheral surface whose diameter decreases as it goes upward. The cylindrical portion 322 extends in a cylindrical shape from the lower end portion of the cone portion 321 downward. A hollow portion 320 is provided inside the cone portion 321 and the cylindrical portion 322.

  The valve body 32 of the present embodiment is made of a metal that is a rigid body. For example, SUS (stainless steel) is used as the material of the valve body 32. However, the material of the valve body 32 may be a metal other than SUS, and a resin or glass may be used instead of the metal. Moreover, instead of a rigid body, an elastic body such as rubber may be used as the material of the valve body 32.

  The drive mechanism 33 is a mechanism for reciprocating the valve body 32 up and down between a lowered position (position in FIG. 2) and a raised position (position in FIG. 3) higher than the lowered position. The drive mechanism 33 of this embodiment has an air cylinder 330. The air cylinder 330 has a cylinder body 331 and a rod 332 that protrudes upward from the cylinder body 331. The rod 332 reciprocates up and down according to the air pressure supplied to the cylinder body 331. The upper end portion of the rod 332 is fixed to the lower surface of the upper end portion of the valve body 32. Therefore, when the rod 332 reciprocates up and down, the valve body 32 reciprocates up and down together with the rod 332.

  The controller 40 is means for controlling the operation of the drive mechanism 33. As conceptually shown in FIG. 2, the control unit 40 is electrically connected to the air cylinder 330. As the control unit 40, for example, a computer or a microcomputer having an arithmetic processing unit such as a CPU or a memory is used. The control unit 40 controls the air pressure supplied to the air cylinder 330 based on a preset program and an input signal from the outside. Thereby, the rod 332 and the valve body 32 reciprocate up and down.

  When the valve body 32 is disposed at the lowered position, the valve seat 31 and the valve body 32 are separated from each other as shown in FIG. For this reason, the resin pellets stored in the storage tank 10 flow downward through the gap between the valve seat 31 and the valve body 32. That is, the discharge port 52 of the storage tank 10 is opened. The discharged resin pellets pass through the periphery of the valve body 32 and are supplied to the subsequent apparatus.

  At this time, the external force from the valve body 32 is not applied to the inner peripheral edge 311 of the valve seat 31. For this reason, the inner peripheral edge 311 of the valve seat 31 is in a state of facing downward (natural state). Therefore, the resin pellets are efficiently discharged downward from the inside of the valve seat 31 through the hole 310. In order to further increase the efficiency of discharging the resin pellets, the inner peripheral edge 311 of the valve seat 31 and the outer peripheral surface of the cone portion 321 of the valve body 32 are spaced at least twice the outer diameter of the resin pellet, It is preferable that they are separated.

  On the other hand, when the valve body 32 is disposed at the raised position, the upper end of the cone portion 321 of the valve body 32 passes inside the inner peripheral edge 311 of the valve seat 31 as shown in FIG. And the outer peripheral surface of the cone part 321 contacts the inner peripheral edge 311 of the valve seat 31. Thereby, discharge | emission of the resin pellet from the storage tank 10 is stopped. That is, the discharge port 52 of the storage tank 10 is closed. At this time, the inner peripheral edge 311 of the valve seat 31 is inverted upward by contact with the valve body 32. Thereafter, when the valve body 32 is again placed at the lowered position, the inner peripheral edge 311 of the valve seat 31 returns its direction downward by its own restoring force.

  4 and 5 are partial cross-sectional views of the vicinity of the discharge port 52 of the granular material storage device 1. FIG. 4 shows a state immediately before the valve body 32 rises from the lowered position and contacts the valve seat 31. FIG. 5 shows a state in which the upward movement of the valve body 32 is completed and the direction of the inner peripheral edge 311 of the valve seat 31 is reversed. As shown in FIG. 4, in the ascending process of the valve body 32, some resin pellets 9 may be caught between the inner peripheral edge 311 of the valve seat 31 and the cone portion 321 of the valve body 32. However, in this granular material discharge valve 30, thereafter, as shown in FIG. 5, the inner peripheral edge 311 of the valve seat 31 reverses upward. Thereby, the bitten resin pellet 9 is returned to the inside of the storage tank 10 together with the inner peripheral edge 311 of the valve seat 31. Then, the resin pellet 9 is released above the valve seat 31 from between the inner peripheral edge 311 of the valve seat 31 and the cone portion 321 of the valve body 32. Therefore, the biting of the resin pellet 9 is eliminated.

  Further, the inner peripheral edge 311 of the valve seat 31 reverses the direction upward, thereby stirring the resin pellets 9 stored inside the valve seat 31. Thereby, aggregation (so-called bridge | bridging etc.) of the resin pellet 9 in the discharge port 52 vicinity is suppressed. Further, even if the resin pellet 9 is aggregated in the vicinity of the discharge port 52, the aggregation can be eliminated by reversing the inner peripheral edge 311 of the valve seat 31. As a result, the resin pellet 9 can be smoothly discharged from the storage tank 10 when the discharge port 52 is opened next time.

  In particular, in the granular material discharge valve 30 of the present embodiment, the inner peripheral surface of the upper portion of the valve seat 31 is in surface contact with the outer peripheral surface of the bottom 12 of the storage tank 10. For this reason, even when the valve body 32 rises and the lower portion of the valve seat 31 is deformed, the shape of the upper portion of the valve seat 31 is maintained without being deformed. Thereby, it becomes easy to repeatedly deform only the lower part of the valve seat 31 to the same state.

  If the inclination angle θ1 in the vicinity of the inner peripheral edge 311 with respect to the central axis of the valve seat 31 is too large, the discharge efficiency of the resin pellets 9 is deteriorated, and if it is too small, the direction of the inner peripheral edge 311 is not easily reversed. In order to achieve both the discharge efficiency of the resin pellets 9 and the ease of inversion of the inner peripheral edge 311, the inclination angle θ <b> 1 is preferably set to, for example, 10 ° to 45 °. Further, it is more preferable that the inclination angle θ1 is 25 ° or more and 40 ° or less.

  Further, if the inclination angle θ2 of the outer peripheral surface with respect to the central axis of the cone part 321 is too large, it becomes difficult to reverse the inner peripheral edge 311 of the valve seat 31, and if it is too small, it is necessary to lengthen the cone part 321 in the vertical direction. . In order to easily reverse the inner peripheral edge 311 and to suppress the length of the cone part 321 in the vertical direction, it is preferable that the inclination angle θ2 is, for example, not less than 10 ° and not more than 45 °. Further, it is more preferable that the inclination angle θ2 is 15 ° or more and 40 ° or less.

  The inclination angle θ1 of the valve seat 31 may be an angle corresponding to the angle of repose of the resin pellet 9, and the inclination angle θ2 of the cone portion 321 may be slightly smaller than the inclination angle θ1 of the valve seat 31.

  Moreover, in the granular material discharge valve 30 of this embodiment, the drive mechanism 33 is accommodated inside the valve body 32. If it does in this way, it can control that resin pellet 9 which flows around valve body 32 contacts drive mechanism 33. Therefore, it can be suppressed that dust adheres to the drive mechanism 33 and the drive mechanism 33 fails.

<3. Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  For example, as shown in FIG. 6, a part of the high-pressure air supplied from the air pressure source 333 to the air cylinder 330 may be blown out from the air cylinder 330 to the internal space of the valve body 32. In the example of FIG. 6, high-pressure air is blown out from the gap between the cylinder main body 331 and the rod 332 of the air cylinder 330 as indicated by the broken line arrow. In this way, since the pressure in the internal space of the valve body 32 is increased, the intrusion of the resin pellet 9 into the internal space of the valve body 32 can be suppressed. Therefore, it is possible to further suppress dust from adhering to the air cylinder 33 as the drive mechanism 33 due to static electricity or the like.

  In the above embodiment, the drive mechanism 33 of the particulate discharge valve 30 is housed inside the valve body 32. However, the drive mechanism 33 may be disposed at another position. For example, as shown in FIG. 7, the drive mechanism 33 may be disposed above the valve body 32. In the example of FIG. 7, the cylinder body 331 of the air cylinder 330 that is the drive mechanism 33 is disposed on the top plate portion 13 of the storage tank 10. The rod 332 of the air cylinder 330 extends downward from the cylinder body 331 through the inside of the storage tank 10. The lower end portion of the rod 332 is fixed to the upper end portion of the valve body 32. Even with such a structure, the rod 332 and the valve body 32 can be reciprocated up and down in accordance with the air pressure supplied to the cylinder body 331.

  In the above embodiment, the air cylinder 330 is used for the drive mechanism 33. However, the driving mechanism 33 may be realized by using another power source such as a motor instead of the air cylinder.

  In the above embodiment, the entire valve seat 31 is formed in a conical shape. However, the entire valve seat 31 does not necessarily have a conical shape. For example, as shown in FIG. 8, the valve seat 31 may include an inclined portion 312 including an inner peripheral edge 311 and a flat plate portion 313 that extends horizontally outside the inclined portion 312. Even in such a shape, at least the center of the valve seat 31 is inclined downward, so that the resin pellets are opened when the valve is opened, compared to the case where the entire valve seat 31 has a horizontal flat plate shape. It can be discharged efficiently. Further, when the valve is closed, the direction of the inclined portion 312 is reversed to prevent the resin pellets from being bitten.

  Moreover, in said embodiment, the cone part 321 of the valve body 32 was formed in cone shape. However, the valve body 32 may have other shapes. For example, as shown in FIG. 9, the upper portion of the valve body 32 may have a hemispherical outer surface. In other words, the valve body 32 only needs to have an outer surface whose diameter decreases as it goes upward in a portion in contact with the valve seat 31.

  In the above embodiment, the granular material discharge valve 30 is provided in the lower part of the storage tank 10. However, the granular material discharge valve of this invention may be provided in the middle of piping which conveys a resin pellet.

  Moreover, the granular material discharge valve and granular material storage device of the present invention may be intended for granular materials other than resin pellets.

  Moreover, about the detailed structure of a granular material discharge valve and a granular material storage apparatus, you may differ from the structure shown by each figure of this application.

  Moreover, you may combine arbitrarily each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

DESCRIPTION OF SYMBOLS 1 Powder storage apparatus 2 Measuring part 3 Mixing part 4 Tank 9 Resin pellet 10 Storage tank 11 Side wall 12 Bottom part 13 Top plate part 20 Granule supply part 21 Material supply pipe 22 Gas suction pipe 23 Filter 30 Granule discharge valve DESCRIPTION OF SYMBOLS 31 Valve seat 32 Valve body 33 Drive mechanism 40 Control part 51 Supply port 52 Discharge port 53 Suction port 100 Metering device 310 Hole part 311 Inner peripheral edge 312 Inclination part 313 Flat plate part 320 Cavity part 321 Cone part 322 Cylindrical part 330 Air cylinder 331 Cylinder Body 332 Rod 333 Air pressure source θ1 Tilt angle θ2 Tilt angle

Claims (10)

A valve body whose diameter decreases toward the top,
A drive mechanism for reciprocating the valve body up and down between a raised position and a lowered position;
An annular valve seat in contact with the valve element disposed in the raised position;
A particulate discharge valve comprising:
The valve seat is formed of an elastic body, and has an annular inner peripheral edge whose diameter is smaller than the maximum diameter of the valve body at the lower center thereof,
When the valve body is disposed at the lowered position, the inner peripheral edge faces downward,
When the valve body is disposed at the raised position, a part of the valve body passes inside the inner peripheral edge, and the inner peripheral edge reverses upward by contact with the valve body. Discharge valve. It is a granular material discharge valve according to claim 1,
The said valve body is a granular material discharge | emission valve | bulb which has a conical outer peripheral surface where a diameter reduces as it goes upwards. The granular material discharge valve according to claim 1 or 2,
The said valve seat is a granular material discharge | emission valve | bulb which has a conical inner peripheral surface and an outer peripheral surface where a diameter reduces as it goes below. It is a granular material discharge valve according to claim 3,
The upper inner peripheral surface of the valve seat is a granular discharge valve that contacts an annular rigid body. It is a granular material discharge valve according to any one of claims 1 to 4,
The drive mechanism is a particulate discharge valve accommodated inside the valve body. It is a granular material discharge valve according to any one of claims 1 to 5,
The valve seat is a particulate discharge valve formed of rubber. The granular material discharge valve according to any one of claims 1 to 6,
The valve body is a particulate discharge valve formed of metal. A storage tank for storing powder particles;
The granular material discharge valve according to any one of claims 1 to 7, provided at a lower portion of the storage tank,
A granular material storage device. The granular material storage device according to claim 8,
A measuring unit for measuring the weight of the powder discharged from the powder storage device;
A weighing device. A weighing device according to claim 9,
The measuring unit measures the weight of a plurality of types of powder discharged from the plurality of powder storage devices, respectively.
A mixing unit for mixing a plurality of types of powder particles measured by the measuring unit;
A tank for storing powder particles mixed by the mixing unit;
A weighing device further comprising:

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