JPH029902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a powder absorption device that is applied to, for example, absorbing paper powder in a paper cutting machine, and particularly relates to a powder absorption device that can save suction power.

[Background of the idea]

For example, it is well known that a paper cutting machine or the like is provided with a powder absorbing device that uses airflow to absorb paper powder immediately after the slitter (Japanese Utility Model Publication No. 134088/1988). Usually, such a device consists of a hopper body having a mortar-shaped bottom and a suction device connected to the bottom outlet of the hopper body through a duct.

However, in paper cutting machines where the top of the hopper body is brought close to the sliver or the paper to be cut,
The height of the hopper body may be restricted by a slitter or the like. Conventionally, as shown in FIG. 5, the slope of the bottom 12 of the hopper body 10 is made small to cope with the height limitation, but in this type of hopper, the powder 16 flows into the bottom outlet 14. The hopper body 10 is difficult to clean and accumulates on the bottom 12, making it necessary to periodically clean the inside of the hopper body 10, which is troublesome. In the case of production equipment such as paper cutting machines, the equipment has to be stopped every time it is cleaned, which is one of the causes of lower operating rates.

In addition, as a means of preventing deposition within the hopper body, it is possible to use a suction device with a large suction force to increase and maintain the air flow velocity within the hopper body. However, in this case, a huge amount of exhaust air is required, and the size of the blower used increases, resulting in an increase in equipment cost and energy cost.

[Purpose of invention]

The present invention was developed in view of these circumstances, and is intended to reliably take out powder, which is the absorbed material, with a small air volume when using a hopper body with a small bottom slope due to equipment height restrictions, etc. The purpose of the present invention is to propose a powder absorption device that can eliminate the need for cleaning and equipment shutdown, and reduce equipment costs and energy costs.

[Summary of the idea]

In order to achieve the above object, the present invention arranges a plurality of rod-like bodies in parallel in the lateral direction at predetermined intervals at a predetermined height above the bottom of the hopper body. That is,
In the present invention, the powder is dispersed above the bottom of the hopper body using a rod-shaped body to prevent the powder from being unevenly distributed in the hopper body and to ensure that the suction action works uniformly within the hopper body. Further, the rod-shaped body provides a baffle-like effect for the air flow along the upper surface of the bottom of the hopper, thereby inducing a scavenging air flow parallel to the upper surface of the bottom. As a result, even if the air volume of the suction device is small, powder can be sufficiently suctioned from inside the hopper body.
This can prevent accumulation and save power.

[Example of idea]

Hereinafter, preferred embodiments of the powder absorption device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the basic structure of the hopper main body.

The bottom part 22 of the hopper main body 20 is shaped like a mortar with a gentle slope, and a take-out port 24 is provided at the center of the bottom part. A suction device (not shown) is connected to the outlet 24 via a duct. Note that the bottom portion 22 of the hopper body 20 does not need to be conical, and may have a shape with flat inclined surfaces facing each other. That is, the mortar shape in the present invention refers to a cross-sectional shape having a portion that slopes downward toward the outlet 24.

Above the bottom 22 of the hopper main body 20, a plurality of rod-shaped bodies, for example pipes 26 having a circular cross section, are arranged in parallel in the lateral direction at predetermined intervals in close proximity to each other.

With this configuration, the powder 28 falling within the hopper body 20 comes into contact with the pipe 26 before reaching the bottom 22. Since the upper surface of the pipe 26 is curved in a convex manner, the amount of deposition on that portion is relatively small. In each pipe gap, the downward suction force with a constant velocity v ₁ acts uniformly on the cross section, so that the powder 28
is dispersed and falls onto the bottom 22.

Further, since the pipe 26 closes the space above the bottom 22, it functions like a baffle plate, and above the bottom 22, an airflow parallel to the bottom 22 at a constant speed _v2 is generated. When this velocity v ₂ is above a certain value, the powder 28 is moved to the bottom 2 by the air flow.
It is smoothly conveyed to the bottom outlet 24 along the direction parallel to the bottom part 22, and is not deposited or attached on the bottom part 22.

According to the experimental results, in the case of paper powder, v ₁ = 8.6 m/
It was confirmed that if suction is performed under the conditions of s, v ₂ = 3 m/s, complete suction without deposits can be achieved with approximately 1/2 the air volume compared to the hopper body without a pipe.

2 to 4 show an example of application to a paper cutting machine. Figure 2 shows its overall shape, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a cross-sectional view of the
It is a sectional view taken along the - line in the figure. In this paper cutting machine, a web 34 is stretched and fed in the longitudinal direction by guide rollers 30, 32, and is cut by a slitter 38 of a cutter unit 36 provided in the middle. A hopper main body 20a is installed at the lower part of the slitter 38 of this paper cutting machine and the lower part of the guide roller 30 on the upstream side thereof.
20b, and a suction device 41 is connected to the bottom outlet ports 24a, 24b via a duct 40.
The duct 40 is provided with a damper (or shutter) 42, a butterfly valve 44, and the like.

The butterfly valve 44 balances the left and right pressures in each hopper body 20a, 20b, and absorbs paper dust generated by the slitter 38 and the guide roller 30.

Inside each hopper body 20a, 20b, a third
As shown in FIG. 4, the bottom portions 22a and 2
Pipes 26a and 26b similar to those in Fig. 1 are installed above 2b.
has been established.

Conventionally, in such paper cutting equipment, the air volume required for complete suction was 74 m ³ /min;
It was confirmed that according to the configuration of the above-mentioned example, only 39 m ³ /min was required. In other words, complete absorption can be achieved continuously with approximately 1/2 the air volume compared to conventional methods.

In the above embodiments, the rod-shaped body is a pipe with a circular cross section, but the rod-shaped body is not limited to this, and may be any type of material as long as it is difficult to deposit powder on the top surface. For example, a rod-shaped body having a convexly curved upper surface and a flat lower surface can also produce the same effect as described above.

It goes without saying that the present invention can also be applied to various types of powder absorption other than paper cutting machines.

[Effect of idea]

As explained above, according to the powder absorption device according to the present invention, a plurality of rod-shaped bodies are disposed in parallel in the lateral direction at a predetermined interval at a predetermined height position above the bottom of the hopper main body. Even if the bottom slope is small, the suction air volume can be used effectively.
Powder can be reliably removed with a small air volume, eliminating the need for cleaning and equipment shutdown. Additionally, equipment costs and energy costs can be saved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the powder absorption device according to the present invention, Fig. 2 is a side view showing an example of its application to a paper cutting machine, and Figs.
5 is a sectional view showing a conventional example. 20, 20a, 20b...hopper body, 22,
22a, 22b... bottom, 24, 24a, 24b
...Bottom outlet, 26, 26a, 26b...Pipe (rod-shaped body).

Claims (1)

[Scope of utility model registration request] In a powder absorption device having a hopper main body having a mortar-shaped bottom with a gentle slope, and a suction device connected to the bottom outlet of the hopper main body and discharging the powder by airflow, the upper part of the bottom of the hopper main body A powder absorption device characterized in that a plurality of rod-shaped bodies are arranged in parallel in the horizontal direction at predetermined intervals at predetermined height positions.