JP2024044137A - Powder and granular material quantitative feeder device - Google Patents

Abstract

[Problem] To provide a quantitative feeder device that allows for a high degree of freedom in line installation and easy transport of powder and granular material. [Solution] A quantitative feeder device 100 for powder and granular material, comprising a storage container 1 into which powder and granular material is input, a supply means 5 for transporting the powder and granular material from below the storage container 1, a supply plate 6 consisting of a gear-shaped disk that stores the powder and granular material transported from the supply means 5 in a metering groove 6a which is a recess of the gear and transports it by rotation, a storage section 61 that is cylindrical with a bottom in which the supply plate 6 is stored and has a discharge hole 62 formed in part of the bottom corresponding to the metering groove 6a of the supply plate 6, a plate-shaped cover 63 that covers the top of the supply plate 6 and has a through hole 64 formed in a position opposite the discharge hole 62 that penetrates the front and back of the plate shape, and an air supply pipe 201 that is connected to the through hole 64 from above and pneumatically transports the powder and granular material stored in the metering groove 6a of the supply plate 6 to the discharge hole 62. [Selected drawing] Figure 1

Description

The present invention relates to a quantitative feeder device for pneumatically transporting powdered or granular material while supplying it in a quantitative amount.

Conventionally, supplying powder or granular material in a fixed amount in a small amount range is extremely difficult because it is affected by the physical properties of the powder or granular material, such as specific gravity, particles, differences in particle size, and adhesion and cohesion caused by moisture and static electricity. This has become a difficult task.

In response to these issues, the applicant developed a quantitative powder feeder device as shown in Patent Document 1. The basic structure of this device is composed of a supply means, a supply plate, and a forced discharge plate. The supply plate and the forced discharge plate are installed at the same height, and the supply means is placed one level higher. The supply means, supply plate, and forced discharge plate are all configured to rotate.

The supply means has multiple blades, the tips of which come into sliding contact with the upper surface of the supply platen. The supply platen and the forced discharge platen are formed as gear-shaped disks with teeth formed at equal intervals on their periphery. The supply platen and the forced discharge platen are arranged so that their teeth mesh with each other.

The powder and granules sent by the blades of the rotating supply means are sequentially sent into the measuring groove of the rotating supply plate, and the measuring groove is filled with the powder and granules. A discharge chute is provided below the position where the protrusions of the forced discharge board engage with the measuring grooves of the supply board, and the powder and granules buried in the measurement grooves of the supply board are forced by the protrusions of the forced discharge board. is discharged into the discharge chute.

When it is desired to transport the powder and granular material discharged from the discharge chute, an ejector is installed horizontally below the discharge chute, and the powder and granule are supplied by falling from the discharge chute toward the receiving hopper formed above the ejector. The powder and granules are sucked in by natural suction and pumped out by air pressure.

JP 2012-41106 A

However, in this quantitative feeder device and transport means, the ejector is installed horizontally, so when powder or granular material is to be transported below the quantitative feeder device, the transport pipe must be bent 90 degrees, which reduces the degree of freedom in installing the line and causes a large pressure loss, resulting in a decrease in the speed of the powder or granular material.

The present invention has been made to address these problems, and aims to provide a quantitative feeder device that allows for a high degree of freedom in line installation and makes it easy to transport powder and granular materials.

The present invention has the following features in order to achieve the above objects.

[1] A powder/granular material quantitative feeder device comprising: a storage container into which powder/granular material is fed; a supply means for transporting the powder/granular material from below the storage container; a supply plate consisting of a gear-shaped disk that stores the powder/granular material transported from the supply means in a metering groove, which is a recess in the gear, and transports it by rotation; a cylindrical storage section having a bottom in which the supply plate is stored and in which a discharge hole is formed in part of the bottom corresponding to the metering groove of the supply plate; a plate-shaped cover that covers the top of the supply plate and has a through hole formed through the front and back of the plate shape at a position opposite the discharge hole; and an air supply pipe connected to the through hole from above and air-transporting the powder/granular material stored in the metering groove of the supply plate to the discharge hole.

[2] The quantitative powder/granular material feeder described in [1] is characterized in that it comprises a discharge tube connected to the discharge hole from below and transporting the powder/granular material contained in the metering groove of the supply board, a Venturi nozzle that connects the storage section and the discharge tube and has a nozzle side that fits into the discharge hole, and a pusher nozzle that connects the cover and the air supply pipe and faces the Venturi nozzle.

[3] A quantitative powder feeder device according to [2], characterized in that the tip of the pusher nozzle is located outside the outer periphery of a circle projected by the rotation of the feeder plate in a plan view, and the tip is inserted into the Venturi nozzle.

[4] The quantitative feeder according to [2] or [3], wherein the cover is provided with an intake hole on the opposite side of the supply plate across the through hole in plan view. quantitative feeder device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the overall configuration of a quantitative feeder device for powder and granular materials from the side according to a first embodiment of the present invention. FIG. 2 is a plan view showing the quantitative unit of the quantitative feeder device for powder and granular material according to the first embodiment of the present invention. FIG. 3 is a sectional view showing the overall configuration of a quantitative feeder device for powder and granular material from the side according to a second embodiment of the present invention. FIG. 2 is a plan view showing a quantitative part of a quantitative feeder device for powder and granular material according to a second embodiment of the present invention. 6 is a cross-sectional side view showing components of an air conveying device for a quantitative powder or granular material according to a second embodiment of the present invention; FIG. 6 is an enlarged cross-sectional side view of a part of the overall configuration of a quantitative powder/granular material feeder device according to a second embodiment of the present invention; FIG.

Hereinafter, with reference to the attached FIGS. 1 and 2, a quantitative feeder device 100 and a pneumatic transport unit for granules according to a first embodiment of the present invention (hereinafter simply referred to as "first embodiment" etc.) 200 will be explained.

FIG. 1 is a sectional view showing the overall configuration of a quantitative feeder device 100 for powder and granular materials according to a first embodiment, and an explanatory diagram showing the connection of a pneumatic transport unit 200.

This powder and granular material metering feeder 100 includes a cylindrical powder and granular material storage container (hopper) 1, a disk frame 2 in which a metering section for measuring the powder and granular material is installed, and a powder and granular material metering section. It has a motor 3 that drives the. The container 1, the disk frame 2, and the motor 3 are installed on a pedestal 4.

In FIG. 1, the container 1 has a straight cylindrical shape for the purpose of preventing bridging. Note that the storage container 1 may be shaped like a cone, the diameter of which decreases toward the bottom.

A removable disc-shaped lid 11 is attached to the upper opening of the storage container 1. The lid 11 is provided with two through holes, and a cylindrical nozzle 11a protrudes upward from the left through hole as viewed in FIG. 1 so that an air pipe 202 extending from the air transport unit 200 can be attached thereto. are connected. Note that an internal pressure gauge (not shown) is attached to the through hole on the right side as viewed in FIG.

A substantially conical stirring shaft 12 is coaxially attached within the container 1 . A stirring rod 13 made of a substantially L-shaped round bar is attached to the stirring shaft 12 as a part thereof. The stirring rod 13 is rotated in synchronization with the stirring shaft 12 by the motor 3, and functions to prevent the powder and granular material in the container 1 from adhering to the bridge or the inner side surface of the container 1. A supply means 5 is attached to the lower end of the stirring shaft 12 for supplying a fixed amount of powder to a supply plate 6, which will be described later.

Figure 2 is a plan view showing the quantification section of the powder/granular material quantification feeder device 100 according to an embodiment of the present invention. The quantification section has a supplying means 5 and a supplying plate 6. The supplying means 5 is disposed at a position one step higher than the supplying plate 6. The supplying plate 6 is accommodated in a storage section 61 having a circular shape that follows the outer circumference of the supplying plate 6 when it rotates.

The supply means 5 has a plurality of blade bodies 5a, 5a provided at equal intervals with respect to the center of the stirring shaft 12. The supply means 5 is arranged so as to partially overlap the periphery of the supply board 6 in plan view, and is arranged so that the tips of the blade bodies 5a, 5a of the supply means 5 are in sliding contact with the upper surface of the supply board 6. ing. By rotating, the supply means 5 promotes the falling of the powder from the storage container 1 disposed on the upper part of the supply means 5, and transfers the powder to the measuring grooves 6a, 6a formed in the supply plate 6. Send it in. The supply means 5 and the supply board 6 are driven by the motor 3. The supply means 5 and the supply board 6 can be made of metal.

The supply disk 6 is constituted by a gear-shaped disk having teeth formed at equal intervals on its periphery. The supply board 6 has metering grooves 6a, 6a continuously formed at equal pitches on the periphery. The powder and granules sent by the blades 5a and 5a of the supply means 5 are sequentially sent into the measuring grooves 6a and 6a which are recesses of the supply board 6, and these recesses (measuring grooves 6a and 6a) are filled with powder and granules. It's being buried.

As shown in FIG. 2, a discharge hole 62 is formed in the bottom of the accommodating portion 61 on the opposite side of the supply means 5 with respect to the supply plate 6 at a position corresponding to the measuring grooves 6a, 6a. A discharge chute 7 is connected to the discharge hole 62 . The discharge chute 7 is a cylindrical nozzle, and is fitted inside the disk frame 2 from below to the upper end of the discharge hole 62 .

As shown in FIG. 1, a thin plate-shaped cover 63 is installed on the top surface of the storage section 61 in which the supply board 6 is stored. The cover 63 is configured to cover the top of the top part of the supply board 6 where the supply means 5 is not provided. The cover 63 has a through hole 64 formed in a position opposite the discharge hole 62.

A nozzle 64a is fitted into the through hole 64 from above to the bottom end of the cover 63, and an air supply pipe 201 extending from the air transport unit 200 is attached to this nozzle 64a.

A conveying pipe 71 is connected to the lower end of the discharge chute 7. The conveying pipe 71 can also be connected in the middle by a bellows tube (not shown). Normally, the quantitative feeder device 100 is placed on a scale, and the flow rate is detected from the weight loss per unit time. The supply amount (discharge amount) is automatically controlled so that it matches the set value (so-called loss-in method). In this case, when transporting powder discharged from the discharge chute, if there is not a gap between the discharge chute and the receiving hopper of the ejector, an unbalanced load will be applied to the scale and the powder cannot be measured. However, with this configuration, by attaching a bellows tube in the middle, the flow rate can be detected by the measuring instrument while directly transporting the powder.

The air transport unit 200 is attached to the cover 63 via an air supply pipe 201, and air from the air transport unit 200 is supplied through the air supply pipe 201 to the through hole 64. At this time, the through hole 64, the metering grooves 6a, 6a, and the discharge hole 62 are arranged so as to overlap in the vertical direction, so that the powder remaining in the metering grooves 6a, 6a is pushed out to the discharge hole 62 (discharge chute 7) by the air blown downward through the through hole 64, and is air-transported to the outlet by the conveying pipe 71.

Furthermore, the air transport unit 200 is attached to the storage container 1 via an air pipe 202. As a result, depending on the properties of the powder and the pressure of the air supplied to the through hole 64, the inside of the container 1 may become negative pressure, and if there is a risk that the powder or the like may be injected backwards, the air can be moved to a slightly positive pressure. By supplying air with air, the inside of the storage container 1 can be made to have the same pressure as the outside air. Note that if there is no risk of back injection, such as when the pressure of the air supplied to the through hole 64 is low, attachment of the air supply pipe 202 and the internal pressure gauge to the storage container 1 can be omitted.

Therefore, according to the quantitative feeder device 100 of the first embodiment, it is possible to simultaneously scrape out the granular material from the measuring grooves 6a, 6a with air and to transport the scraped out granular material downward by air. Therefore, when it is desired to transport powder or granular material below the quantitative feeder 100, there is no need to install the ejector horizontally and bend the transport piping by 90 degrees, so there is a high degree of freedom in line installation, and there is no pressure loss. Since the particle size is small, the speed of the granular material is difficult to reduce, making it easy to transport the granular material.

Next, a granular quantitative feeder device 300 and an air transport unit 200 according to the second embodiment will be described with reference to the attached Figures 3 to 6. The second embodiment differs from the first embodiment only in the air transport configuration, so only the differences will be described below, and the same components as the first embodiment will be assigned the same reference numerals and will not be described again.

As shown in FIG. 4, in the quantitative portion of the second embodiment, the storage portion 361 is configured with cylindrical inner surfaces that are partially overlapped, resembling an inverted "8" shape in a plan view. The discharge hole 62 provided at the bottom of the storage portion 361 is the same as in the first embodiment.

As shown in Figures 3, 5, and 6, in the second embodiment, a Venturi nozzle 81 is fitted into the discharge hole 62 instead of the discharge chute 7. A conveying pipe 71 is connected to the lower end of the Venturi nozzle 81. In addition, in the second embodiment, a pusher nozzle 82 is attached instead of the nozzle 64a. The pusher nozzle 82 is attached to the cover 363 via a disk-shaped stopper 83 and a cylindrical mounting piece 84 with a step.

As shown in FIG. 5, a through hole 364 is drilled in the cover 363. The through hole 364 has a large diameter portion 364a and a small diameter portion 364b connected via a step portion 364c. The mounting piece 84 is attached to the cover 363 by being inserted into the large diameter portion 364a until it reaches the upper surface of the step portion 364c. The pusher nozzle 82 is fitted into the mounting piece 84 via a stopper 83. The inner diameter of the small diameter portion 364b is formed to be approximately the same as the outer diameter of the tip of the pusher nozzle 82.

Therefore, as shown in FIG. 6, the tip of the pusher nozzle 82 is inserted into the small diameter portion 364b, protrudes from the lower surface of the cover 363, and enters the vicinity of the trumpet-shaped suction port of the Venturi nozzle 81. At this time, as shown in FIG. 4, the tip of the pusher nozzle 82 is coaxial with the discharge hole 62, as shown by the imaginary line in FIG. It is placed outside the outer circumference of the circle that reflects the rotation of the board.

In addition, by preparing multiple mounting pieces 84 or stoppers 83 with different vertical lengths and replacing the mounting pieces 84 (or stoppers 83), the distance between the suction port of the Venturi nozzle 81 and the tip of the pusher nozzle 82 can be adjusted, thereby adjusting the suction strength.

As shown in Figures 3, 5, and 6, the cover 363 is provided with an intake hole 365. As shown by the imaginary line in Figure 4, the intake hole 365 is provided in a portion of the storage section 361 that is enlarged from the storage section 61 of the first embodiment, i.e., on the opposite side of the supply means 5 across the through hole 364, penetrating the front and back of the cover 363. A fitting tube 363 is inserted into the intake hole 365 from above the cover 363.

As shown in FIG. 3, the air transport unit 200 is attached to the fitting tube 366 of the cover 63 via the air pipe 203, and the air from the air transport unit 200 passes through the air pipe 203 to the housing section 361. supplied to

The air transport unit 200 is attached to the pusher nozzle 82 via an air pipe 201, and air from the air transport unit 200 is supplied to the pusher nozzle 82 through the air pipe 201.

At this time, the tip of the pusher nozzle 82 passes through the housing part 361 and reaches the venturi nozzle 81, so compressed air from the pusher nozzle 82 is not blown into the housing part 361, but due to the Venturi effect, The vicinity of the suction port of the Venturi nozzle 81 becomes negative pressure, and the powder and granules remaining in the measuring grooves 6a and 6a are sucked into the Venturi nozzle 81 and transported to the outlet by the accelerated air in the transport pipe 71. Ru.

At this time, since air is supplied to the housing part 361 from the air transport unit 200 via the air pipe 203, the negative pressure in the housing part 361 by the pusher nozzle 82 is canceled out, and the air is equal to the outside air. It can be made into pressure. Note that the supply of air to the storage container 1 through the air supply pipe 202 may be performed as appropriate, and if the supply of air through the air supply pipe 203 is sufficient, the installation of the air supply pipe 202 and the internal pressure gauge to the storage container 1 can be omitted. It is.

Therefore, according to the quantitative feeder device 300 of the second embodiment, the powdered material can be scraped out of the metering grooves 6a, 6a with air while simultaneously conveying the scraped out powdered material downward by air. Therefore, when it is desired to transport powdered material below the quantitative feeder device 300, it is not necessary to bend the transport piping by 90 degrees after installing the ejector horizontally, which provides the advantageous effect of providing a high degree of freedom in installing the line and preventing the speed of the powdered material from decreasing due to small pressure loss.

In addition, according to the second embodiment of the quantitative feeder device 300, an ejector can be built in, so the speed of the powder can be increased with less air supply.

Next, we will explain modified examples of the first and second embodiments.

In the above description, the air transport unit 200 has been described using as an example a unit that sends air to a plurality of air pipes, but a plurality of independent pumps may be connected, and the invention is valid as long as air can be sent to the air pipe 201. , only one pump may be connected to the air pipe 201.

As explained above, the quantitative feeder device 100 of the first embodiment and the quantitative feeder device 300 of the second embodiment have a high degree of freedom in line installation because the ejector does not need to be installed horizontally, but the present invention does not exclude devices equipped with an ejector installed horizontally from its scope of rights. For example, air transporting a certain distance downward, and then further installing the ejector horizontally to transport horizontally also increases the degree of freedom in line installation, and is one aspect of the present invention.

1 Storage container 5 Supply means 6 Supply plate 6a Metering groove 61 Storage section 62 Discharge hole 63 Cover 64 Through hole 71 Discharge tube 81 Venturi nozzle 82 Pusher nozzle 100 Quantitative feeder device 201 Air supply pipe 300 Quantitative feeder device 361 Storage section 363 Cover 364 Through hole 365 Air intake hole

Claims (4)

A container into which powder and granular material are placed;
A supply means for conveying powder or granular material from below the storage container;
a supply plate which is a gear-shaped disk and which receives the powder or granular material from the supply means and rotates to convey the powder or granular material while storing it in a metering groove which is a recess of the gear;
a housing part having a cylindrical shape with a bottom in which the supply plate is housed, the housing part having a discharge hole formed in a part of the bottom corresponding to the metering groove of the supply plate;
A plate-shaped cover that covers an upper portion of the supply board and has a through hole that penetrates the front and back of the plate shape at a position opposite the discharge hole;
A quantitative powder/granular material feeder device comprising: an air supply pipe connected to the through hole from above, for pneumatically transporting the powder/granular material contained in the metering groove of the supply plate to the discharge hole. The quantitative feeder device for powder or granular material according to claim 1,
a discharge tube connected to the discharge hole from below and through which the powder and granular material accommodated in the measuring groove of the supply board is transported;
a Venturi nozzle that connects the housing part and the discharge tube, and whose nozzle part side is fitted into the discharge hole;
A quantitative feeder for powder and granular material, characterized in that it is equipped with a pusher nozzle that connects a cover and an air pipe and faces a venturi nozzle. The quantitative feeder device for powder or granular material according to claim 2,
A quantitative feeder for powder and granular material, wherein the tip of the pusher nozzle is located outside the outer periphery of a circle on which the rotation of the supply plate is projected in plan view, and the tip is inserted into a venturi nozzle. The powder/granular material quantitative feeder device according to claim 2 or 3,
A quantitative powder/granular material feeder device, characterized in that the cover is provided with an air intake hole on the opposite side of the supply plate across the through hole when viewed in a plan view.

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