JPH053192U - Powder bridging prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a hopper that stores powder having a caking property, to prevent the formation of a bridge of the powder and to facilitate the collapse. [Structure] A flexible diaphragm 3 is laid on the inner wall of a hopper 1 provided with a discharge port 2 on an inverted truncated cone-shaped truncated head, and
A cylinder 4 that expands and contracts inside the diaphragm 3.
In a powder bridge prevention device having a plurality of cylinders 4a, 4b, ..., Cylinders 4a, 4b, ..
4b ... causes a displacement in the direction of the pressing force due to expansion and contraction, and facilitates formation and collapse of the bridge 6. [Effect] Since the displacement of the pressing force due to the expansion and contraction of the cylinders 4a, 4b ... Is not only effectively prevented from forming the bridge, but also the bridge once formed can be easily collapsed. It was

Description

[Detailed description of the device]

[0001]

[Technical field of invention]

 The present invention relates to a powder bridge prevention device, and more particularly to a powder bridge prevention device that effectively collapses bridges generated in a powder storage hopper and enables smooth discharge.

[0002]

[Prior art]

 As shown in FIGS. 3 and 4, a hopper for discharging powder conventionally stored in a hopper 1 having an arbitrary shape such as a conical shape or a pyramid shape from a discharge port 2 provided at a cutting head of the hopper 1. In the apparatus, the inner wall of the hopper 1 is provided with a diaphragm 3 made of a flexible and abrasion-resistant material, for example, rubberized cloth, and inside the diaphragm 3, a cylinder 4 that expands and contracts by the action of gas is provided. The structure is provided.

The diaphragm 3 and the cylinder 4 as described above collapse the bridge 6 formed by the powder 5 formed near the discharge port 2 of the hopper 1 so that the powder 5 can be smoothly discharged from the discharge port 2. By expanding and contracting the cylinder 4, the diaphragm 3 is vibrated to prevent the bridge 6 from being formed, and the powder 5 is smoothly discharged from the discharge port 2.

[0004]

[Problems solved by the device]

 In the powder bridge preventing device in the hopper device as described above, the same cylinders 4 are evenly and oppositely arranged in the hopper 1, and the adjacent cylinders 4 are alternately expanded and contracted to thereby reduce the powder. It was intended to prevent the collapse or formation of body bridges.

Generally, dry powder can exert sufficient effect in the powder bridge preventing device having the above-mentioned structure, but it has a large content of water, oil, etc. In the case of the powder 5, the bridge 6 tends to become stronger by tightening the powder portion near the discharge port 2.

It is an object of the present invention to solve the above-mentioned problems, and more specifically to provide a powder bridge preventing device that can effectively prevent powder bridge even in powder having a large caking property. And

[0007]

[Means for solving problems]

 In order to achieve the above object, the powder bridge prevention device according to the present invention lays a flexible diaphragm on the inner wall of a hopper having an inverted truncated cone-shaped truncated head with a discharge port, and expands and contracts inside the diaphragm. In a powder bridge prevention device having a plurality of cylinders, the distance from the lower end of at least one of the plurality of cylinders to the discharge port is different from the distance from the lower end of the other cylinder to the discharge port. It is characterized by having done.

That is, by providing a difference of ΔH between the lower ends of the adjacent cylinders, the pressure caused by the expansion and contraction of the powder bridge is displaced, and a fault is formed to prevent collapse and formation of the bridge. Is better performed.

[0009]

【Example】

 FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of the above plan view. As is clear from this figure, an outlet 2 is provided in the truncated head of the inverted truncated cone-shaped hopper 1, and the inner wall of the hopper 1 is a diaphragm made of a flexible material. 3 is provided. The cylinders 4a and 4b are provided between the inner wall of the diaphragm 3 and the inner wall of the hopper 1.

In the powder bridge prevention apparatus according to the present invention, the cylinders 4a and 4b adjacent to each other among the cylinders are not the same size but different in size, and the lower end portions of the cylinders 4a and 4b are different from each other. Of the cylinders 4a and 4b adjacent to each other so that a difference of ΔH is formed. In the above-described embodiment, the cylinders 4a and 4b are large and small as is clear from FIG. 1, but it is also possible to arrange them so that ΔH is generated with the same size. Further, in the above embodiment, the large and small cylinders 4a and 4b are arranged adjacent to each other and the cylinders of the same size are arranged to face each other, but it is clear that this arrangement is not restrictive. Is.

This ΔH is preferably 0.1 L to 0..L, based on the overall height L of the hopper 1. The difference is preferably about 5 L. If it is less than 0.2 L, the difference between the lower ends of the cylinders 4a and 4b is small and the displacement in the direction of the pressing force due to expansion and contraction is small, and the action to prevent the bridge from breaking and forming is reduced, while 0.5 L If it is larger, the difference will be too large and the effect of the face-to-face arrangement will be weakened.

The powder bridge prevention device according to the present invention is preferably applied to powder having a caking property. In other words, it is not necessary to use the structure of the present invention if it has no caking property and the conventional powder bridge preventing device is sufficient. Considering the above, the powder bridge prevention device of the present invention has a high caking property. For example, it is preferable to use powder such as titanium oxide, silicon oxide, and pigment.

Although the pyramid shape of the hopper has been shown as an example in the above-mentioned embodiment, the shape of the hopper is not limited to this in the present invention, and any other pyramidal shape such as a cone shape is basically used. It may have any shape.

Also, the number of cylinders is not limited in the present invention, and may be any number as long as the lower ends of the cylinders are positioned differently.

[0015]

[Action]

 As described above, the diaphragm 3 vibrates by alternately expanding and contracting the cylinders 4a and 4b having the difference of ΔH at the lower end. At this time, the direction of the pressing force generated by the vibration of the diaphragm 3 is such that the lower end portions are at different heights, so that a deviation occurs as shown in FIG. 2 and the bridge 6 is easily collapsed. Therefore, not only the formation of the bridge 6 is prevented but also the bridge 6 once formed can be collapsed.

At this time, for example, the opposed cylinders 4a and 4a in FIG. 1 are expanded and contracted at the same cycle, and the adjacent small-sized cylinders 4b and 4b are different from the cylinders 4a and 4a at the same cycle. It is effective to expand and contract in a cycle. That is, when the small-sized cylinders 4b and 4b are expanded, it is preferable to expand and contract so that the large-sized cylinders 4a and 4a are contracted.

Further, it has been found that it is also effective to expand and contract the cylinder sequentially in the clockwise or counterclockwise direction.

[0018]

[Effect of the device]

 According to the powder bridge prevention device of the present invention, since the distances to the discharge ports at the lower ends of the plurality of cylinders are made different, a displacement occurs in the direction of the pressing force due to the expansion and contraction of the cylinders, which makes the bridge less than the conventional one. Collapse easily. Therefore, it is possible to effectively prevent the formation of bridges, and it is possible to easily collapse the bridges once formed.

[Brief description of drawings]

FIG. 1 is a plan view of a powder bridge prevention device according to the present invention.

FIG. 2 is a sectional view of the powder bridge prevention device taken along the line AA.

FIG. 3 is a plan view of a conventional powder bridge prevention device.

FIG. 4 is a cross-sectional view of the powder bridge prevention device taken along the line BB.

[Explanation of symbols]

 1 Hopper 2 Discharge port 3 Diaphragm 4, 4a, 4b Cylinder 5 Powder 6 Bridge

Claims (1)

[Claims for utility model registration] [Claim 1] A flexible diaphragm is laid on the inner wall of a hopper provided with a discharge port on the inverted truncated cone-shaped truncated head, and a cylinder that expands and contracts inside the diaphragm is provided. In a plurality of powder bridge prevention devices provided, the distance from the lower end of at least one of the plurality of cylinders to the discharge port is different from the distance from the lower end of the other cylinder to the discharge port. A powder bridge prevention device.