JP3127119B2 - Powder supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder supply device, and more particularly to a powder supply device for effectively preventing powder from adhering.

[0002]

2. Description of the Related Art A hopper for storing powder and a screw feeder provided at a lower portion of the hopper and connected to a drive source are provided. The drive of the drive source rotates the screw feeder to sequentially supply the powder in the hopper. There is known a powder feeding device of a so-called screw pressure feeding system. When supplying highly adherent powder in this type of equipment, powder adheres to the screw surface of the screw feeder, powder adheres to each other in the hopper, or powder adheres to the inner wall surface of the hopper. I do.

[0003] When the powder adheres to the screw surface, the powder also rotates together with the rotation of the screw feeder, making it impossible to advance the powder, resulting in clogging.
When powders adhere to each other in the hopper or adhere to the inner wall surface of the hopper, the powder is bridged between the inner wall surfaces of the hopper to form a so-called bridge that forms a bridge. Specifically, even if the powder in the lower part of the hopper is reduced by being fed by the rotation of the screw feeder, the powder does not flow due to the friction between the powder above it and the inner wall surface of the hopper, and the powder flows to the lower part of the hopper. Bridges are created by the creation of cavities (rat holes).

Conventionally, a helical screw having no axis has been used for supplying powder having high viscosity and adhesion. This type of screw has a longer time until clogging occurs as compared with a screw having a shaft core, but eventually causes clogging of the spiral portion, making it impossible to supply powder. There is also a method of removing the powder adhering to the screw by vibrating the screw itself.However, a drive mechanism serving as a vibration source is required, which not only increases the cost but also causes the powder in the hopper to be reversed if the vibration continues. This causes a problem that the powder is compacted by being pressed, and good fluidity of the powder cannot be obtained.

In Japanese Utility Model Laid-Open No. 2-125735, a driving device is provided above a hopper, a vertically moving rod is mounted in the hopper by a driving device, and a stirrer is mounted on the vertically moving rod to form a block in the hopper. An apparatus for breaking the bridge-like powder that has become described. JP-A-5-23575 discloses that a stirring shaft is provided in a powder storage tank, a plurality of stirring blades are extended from the stirring shaft, and the stirring blade is rotated by rotating the stirring shaft to stir the powder. An apparatus for performing the above is described.

Further, in Japanese Patent Application Laid-Open No. 4-118041, a hopper is formed of a flexible material, and a hard annular body connected to a driving source and surrounding the hopper is provided. It describes an apparatus that breaks a bridge of powder by changing the shape of a conductive hopper. In addition, Shokai 60
Japanese Patent Publication No. 39333 discloses an apparatus in which ejection nozzles are arranged in a hopper and ejects air to break a bridge. ,

[0007]

However, Japanese Utility Model Application 2-1
In the devices disclosed in Japanese Patent No. 25735 and Japanese Patent Application Laid-Open No. Hei 5-23575, not only a device for driving an agitator such as a stirring member or a stirring blade is necessary, but also the powder is largely moved by the agitator. There is a drawback in that the powder located outside the drive region is compacted. In the apparatus disclosed in JP-A-4-118041,
Similarly, a drive is required, and compaction of the powder may occur. Further, the device described in Japanese Utility Model Laid-Open No. 39333/1985 requires a mechanism for air injection,
In addition, since the air flow acts on a local portion of the powder, there is a problem that the bulk density of the powder cannot be kept constant.

Accordingly, the present invention has a hopper for storing powder and a screw feeder provided below the hopper and connected to a driving source. The driving of the driving source causes the screw feeder to rotate to remove powder in the hopper. In the powder supply device that supplies sequentially, without separately providing a driving device, powder adhesion to the screw, powder adhesion in the hopper,
It is an object of the present invention to provide a powder supply device capable of effectively preventing powder from adhering to a wall of a hopper and bridging of the powder in the hopper, thereby enabling smooth powder supply.

[0009]

In order to achieve the above object, the present invention provides a hopper 10 for storing powder and a hopper 1 for storing powder.
0 and a screw feeder 21 connected to a driving source,
And the screw feeder 21 rotates.
The screw feeder 21
A vibration plate 31 that vibrates by hitting a screw surface, and the screw feeder 2 is driven by the driving source.
In sequentially supplies powder feeder is rotated a powder within the hopper 10 to 1, a support shaft 30 which is oscillatably extends into the hopper 10, the upper portion of the hopper 10 from the support shaft 30 toward comprising a vibration transmission plate which is erected, the diaphragm
31 extends from the support shaft 30 and the vibration transmission plate 33
The vibration of the moving plate 31 is transmitted through the support shaft 30
To provide a powder supply device that vibrates according to the following .

Here, it is preferable that the support shaft 30 is extended below the hopper 10. The diaphragm 31
It is preferable that the vibration transmission plate 33 is detachably fixed to the support shaft 30. Further, the present invention stores powder.
A hopper 10 and a drive source provided below the hopper 10
Having a screw feeder 21 connected thereto;
To rotate the screw feeder 21
A powder supply device for sequentially supplying the powder in the hopper 10 is provided.
A support shaft 30 extending into the hopper 10,
Between the shaft 30 and the rotation range of the screw feeder 21.
And a hopper from the support shaft 30
A vibration transmission plate 33 erected toward the top of
The support shaft 30 provides a powder supply device slidably provided in the axial direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A powder supply apparatus according to an embodiment of the present invention will be described with reference to FIGS. This powder supply device is used, for example, to supply a powdery release agent to a die casting machine.

In FIG. 1, a powder supply device 1 has a hopper 10 and a feeder section 20 provided below the hopper 10. The hopper 10 has an inverted quadrangular pyramid shape, the upper part of which forms a powder inlet 11 and accommodates the powder P therein. The inside of the hopper 10 communicates with a dryer (not shown) for drying the powder P, and an air inlet (not shown) for promoting powder discharge is formed as necessary. The hopper 10 may have an inverted conical shape.

The feeder section 20 includes a screw feeder 21 provided at a position facing the lower end opening 12 of the hopper 10, and a drive motor 22 connected to a rotation shaft 21a of the screw feeder 21 and controlled to rotate by a control box (not shown). And An electromagnetic shutter 23 is provided on the powder outlet side of the screw feeder 21, and a hose for conveying powder (not shown) is connected thereto. Since the high-pressure air flows through the hose, the electromagnetic shutter 23 prevents the powder P discharged by the screw feeder 21 from flowing back through the screw feeder 21 and entering the hopper 10 by the high-pressure air.

At a lower position in the hopper 10, a support shaft 30 extending substantially parallel to the rotation shaft 21a of the screw feeder 21 is provided. One end of each of the plurality of diaphragms 31 extending downward from the support shaft 30 is attached to the diaphragm fixing screw 3.
2 detachably attached to the support shaft 30. The free end of each diaphragm 31 is located within the rotation range of the screw feeder 21. Therefore, the free end of the diaphragm 31 is configured to be able to contact the screw feeder 21 by the rotation of the screw feeder 21.

One end of each of the plurality of vibration transmission plates 33 extending upward from the support shaft 30 is detachably attached to the support shaft 30 by a vibration transmission plate fixing screw (not shown). Therefore, the vibration transmission plate 33 is located in the powder P accommodated in the hopper 10. Here, the vibration plate 31 and the vibration transmission plate 33 are formed of an elastic material exhibiting an elastic restoring force (spring property).

In the above configuration, the powder P supplied from the powder supply port 11 is stored in the hopper 10. Drive motor 2 based on a drive signal from a control box (not shown)
When the screw feeder 21 is rotated by the drive of 2, the diaphragm 31 is repelled by the screw surface, elastically deforms and hits the screw surface, and the powder attached to the screw surface is wiped off by the impact. FIGS. 2 and 3 show only one diaphragm 31 for simplicity. However, the rotation of the screw feeder 21 causes the free end of the diaphragm 31 to abut on the crest of the screw feeder 21 and the broken line position in FIG. Swings while elastically deforming in the direction of the solid line from
At the critical point, the ball is flipped over the peak in the direction of the broken line. That is, the vibration plate 31 is repeatedly flipped between the solid line position and the broken line position, and the powder is separated from the screw surface by the vibration at that time,
As shown in FIG. 3, a state in which no powder adheres is obtained. 2 and 3 show only the powder attached to the screw, and the powder fed by the screw feeder 21 is not shown.

Further, the vibration of the vibration plate 31 accompanying the rotation of the screw feeder 21 causes the vibration transmission plate 33 to simultaneously shake as shown in FIG. Therefore, the bridge of the powder P formed in the hopper 10 is broken. Therefore, the powder can flow smoothly to the lower part of the hopper 10, and the powder P is reliably transferred by the screw feeder 21.

The present invention is not limited to the embodiment described above, and various modifications are possible. For example, various types of the vibration plate 30 and the vibration transmission plate 33 having different spring forces are prepared, and the vibration plate 30 and the vibration transmission plate 33 are selectively used according to the type and amount of the powder, and the vibration plate and the vibration transmission plate are supported. By adjusting the number of sheets attached to the shaft, a more effective powder adhesion preventing effect can be obtained. Also, if necessary, a mechanism that allows the support shaft 30 to slide in the axial direction is added, and the powder in the hopper is regenerated by reciprocating the support shaft 30 in the axial direction during the powder supply operation. Vibration can be applied to a wide range.

[0019]

According to the powder supply device of the first aspect of the present invention, since the diaphragm extends to the rotation range of the screw feeder, the diaphragm is repelled by the rotation of the screw feeder, and the diaphragm is repelled. Vibrates, and the screw surface vibrates. Therefore, the powder adhering to the screw surface can be easily wiped off, the powder is effectively prevented from adhering to the screw surface, and the powder can be smoothly advanced. In addition, the vibration also causes the vibration transmission plate standing upright toward the upper part of the hopper to vibrate, so that the powder in the hopper is vibrated, and the flow of the powder in the hopper is promoted. Therefore, the adhesion between the powders accumulated in the hopper can be weakened, and the occurrence of bridges due to the powders can be prevented. Here, since the vibration plate and the vibration transmission plate are interlocked with the screw, they do not always vibrate, but only generate intermittent weak vibrations only during powder supply. The powder is not greatly moved in the space inside the screw or in the hopper by
No compaction of the powder in the hopper occurs, and no lump or the like due to the powder is generated. Further, it is not necessary to separately provide a driving device for vibrating the vibration plate or the vibration transmission plate.

According to the powder supply device of the second aspect of the present invention, the diaphragm can be vibrated reliably. That is, due to the weight of the deposited powder, the fluidity of the powder at the bottom of the hopper is inferior to the fluidity of the powder at the top of the hopper,
The motility of the diaphragm abutting the screw located at the lower part of the hopper tends to be impaired, but since the support shaft is provided at the lower part in the hopper, the diaphragm will be located near the screw feeder, By virtue of the contact with the rotating screw surface, the popping of the diaphragm can be ensured, and strong vibration can be generated on the diaphragm. Therefore, the powder adhering to the screw surface can be reliably removed.

According to the third aspect of the present invention, since the vibration plate and the vibration transmission plate are detachable from the support shaft, the properties of the powder, such as clumpiness, adhesion, weight, The optimum diaphragm can be used by changing the number of diaphragms or vibration transmission plates according to the amount of powder, or by changing the material to change the flexibility.

According to the powder supply device of the present invention, since the support shaft is slidable in the axial direction,
Vibration can be transmitted over the entire area in the hopper, and a sufficient powder adhesion preventing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a powder supply device according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a feeder section of the powder supply device according to the embodiment of the present invention.

FIG. 3 is a schematic side view showing a feeder section of the powder supply device according to the embodiment of the present invention, showing a state where powder is separated from a screw surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powder supply apparatus 10 Hopper 21 Screw feeder 30 Support shaft 31 Vibration plate 33 Vibration transmission plate

Continuation of the front page (72) Inventor Kazuhiko Watanabe 762, Mezaki-cho, Fuchu-shi, Hiroshima Inside Ryobi Co., Ltd. (56) References Japanese Utility Model Sho-56-92626 (JP, U) Japanese Utility Model Sho-60-47079 (JP, U) JK 49-5754 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01J 4/00-4/02 B65B 1/12 B65D 88/64 B65G 65/46

Claims (4)

(57) [Claims] 1. A hopper for storing powder, and a screw feeder provided below the hopper and connected to a driving source.
And is extended to within the rotation range of the screw feeder,
Elastic deformation due to rotation of the screw feeder
Tapping the screw surface of the screw feeder
And a vibrating plate that vibrates according to the following . A powder feeder that supplies the powder in the hopper sequentially by rotating the screw feeder by driving of the driving source, is extended in the hopper so as to vibrate . A support shaft, a vibration transmission plate erected from the support shaft toward the upper part of the hopper , the vibration plate extends from the support shaft, and the vibration transmission plate is configured such that the vibration of the vibration plate causes the support shaft to rotate. Conveyed through
A powder supply device characterized in that the powder supply device vibrates by being operated. 2. The powder supply device according to claim 1, wherein said support shaft extends at a lower portion in said hopper. 3. The powder supply device according to claim 1, wherein the vibration plate and the vibration transmission plate are detachably fixed to the support shaft. (4)A hopper for storing powder and a hopper below the hopper
Screw feeder installed in the unit and connected to the drive source
Having the screw feeder driven by the drive source
To supply powder in the hopper sequentially by rotating
In the device, A support shaft extending into the hopper, Extending from the support shaft to the rotation range of the screw feeder.
The installed diaphragm, Vibration erected from the support shaft toward the top of the hopper
Equipped with a transmission plate,  The support shaft is slidably provided in the axial direction.
A powder supply device, comprising: