JPH0355540Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a cutting device that allows powder and granular material to be smoothly transported to a suction wheel or the like in a hopper.

[Prior Art] FIG. 4 is a sectional view showing an example of a conventional powder hopper cutting device, and FIG. 5 is a sectional view showing another example of a conventional powder hopper cutting device. be.

In FIG. 4, 1 is a cut-out part provided at the lower part of the hopper 9, and 20 is a cylindrical casing (nozzle) provided protruding from the front and rear of the lower part of the cut-out part 1.
20-1 is the front part of the casing, 20-2 is the rear part of the casing, 20A is the suction port at the front end of the front part 20-1 of the casing, and 30 is the rear part of the casing 20-2.
5 is a support member for supporting the cylinder 30 coaxially with the casing 20, and 9 is a dust collector. A hopper stores powder and granular materials such as dust collected in a chamber, 10 is a hopper 9
11 is an on-off valve provided at the front end of the casing front part 20-1; 13 is an on-off damper provided at the lower part of the casing;
is the suction tube, and D is the dust.

Next, the operation of the conventional powder hopper cutting device shown in FIG. 4 will be described.

First, the suction port 20A of the casing 20 is connected to the suction wheel via the suction pipe 13.

Next, the on-off valve 11 is opened to start the suction operation of the suction wheel, and when the on-off damper 10 is gradually opened, the dust D in the hopper 9 falls into the cut-out part 1 at the bottom of the hopper 9, where the air inlet 2E is opened. The air flowing out from the cylindrical body 30 through the cylindrical body 30 is mixed at the tip of the cylindrical body 30 to increase fluidity, and the air flowing out from the casing front part 20-1 and the suction pipe 1 is mixed.
3 and is sucked into the suction wheel.

The device shown in FIG. 5 is a screw-type cutting device for pneumatic transportation of powder and granules using pressurized air, which is described in Japanese Utility Model Application Publication No. 59-95026. In the figure, 21 is a screw whose screw blades become smaller from the middle toward the tip, 21A is a screw shaft, and 2
2 is a casing whose rear part is cylindrical and is provided at the lower part of the hopper 28, and whose diameter increases at the middle part and decreases toward the tip, forming a conical shape; 23 is the conical shape of the casing 22; The outer ring portion 24 is formed between the inner wall of the shaped portion and the tip portion of the screw 21, and 24 is the outer ring portion 23.
A guide vane is fixed to the inner wall of the casing 22 in a spiral shape, 25 is a suction pipe, 26 is an air inlet provided at the maximum diameter part of the casing 22, and 27 is provided near the air inlet 26. A water jet that spouts water, and D is dust. Next, the operation of the screw-type cutting device shown in FIG. 5 will be explained.

First, the suction wheel is connected to the suction wheel through the suction pipe 25, and the suction wheel starts suction. Next, the screw shaft 21A is rotated by a motor (not shown). As a result, the dust D accumulated in the hopper 28 is It falls into the casing 22 and is continuously conveyed forward by the screw 21 until it reaches the conical portion. At this time, since the suction operation of the suction wheel has already been performed, the inside of the casing 22 has a negative pressure, and the outside air is flowing in vigorously from the air introduction port 26. The dust D is agitated by the inflowing air and the guide vanes 24, mixed with air to increase fluidity, and is smoothly air-transported to the suction wheel via the suction pipe 25.

[Problems to be solved by the invention] Since the conventional powder hopper cutting device shown in FIG. Dust D is caused by frequent shelf hanging or intermittent dust D.
When it is accommodated, it does not fall into the cutting section 1 in small amounts continuously, but sometimes a large amount may fall discontinuously at once. For this reason, the inside of the casing front part 20-1 and the inside of the cylinder 30 are clogged with dust, and the cutout part 1
The inside of the casing 20 is often clogged with dust D, and the dust D is smooth and continuous.
It was extremely difficult to maintain the transportation of For this reason, once the above-mentioned dust blockage occurs in the cut-out device of the hopper that accommodates the dust D generated from a factory that operates continuously day and night, it is not possible to directly connect the suction wheel to suction and discharge the dust D. However, there is a concern that the factory's dust generating equipment, which is connected to the dust hopper and discharges dust, may have to be temporarily shut down, so a spare hopper must be provided for storage. Therefore, a large amount of cost and space is required to install the above-mentioned spare storage hopper, dust switching conveyor, and the like.

Furthermore, although the screw-type cutting device shown in Fig. 5 does not have the same problems as the powder hopper cutting device shown in Fig. 4, it has a complicated mechanism, high equipment cost, and requires complicated maintenance work. In addition, power for rotating the screw 21 is also required.

This invention was devised to solve these problems, and it is a simple structure, easy to maintain, and inexpensive powder that can continuously and stably transport powder and granular materials such as dust. The purpose is to present a body hopper cutting device.

[Means for Solving the Problems] The powder hopper cutting device according to this invention includes an opening/closing damper provided in the lower part of the powder hopper, and a cylindrical damper that horizontally penetrates the bottom of the powder hopper. An air inlet is provided at the rear end of the casing, and the front end is connected to the suction pipe via an on-off valve. A plurality of inflow ports are provided for putting the body into the casing, and a core is provided in the casing to form a flow path having a donut-shaped cross section in a predetermined area within the casing. It is a composition.

[Function] That is, the powder hopper cutting device of the present invention allows the hopper to form the casing and core from the air inlet (pipe) by opening the opening/closing damper at the bottom of the hopper and the opening/closing valve on the suction pipe side. While air flows through the channel having a doughnut-shaped cross section, the powder and granules fall into the bottom of the hopper and accumulate around the casing. The air flowing inside the casing allows the body to flow into the casing almost continuously in small amounts through the inlet ports provided in the longitudinal direction, circumferential direction, etc. of the casing peripheral wall in the form of a plurality of slits or circular notches. It is sucked into the donut-shaped flow path and mixed with air, and diluted and mixed in the circular cross-sectional flow path after the front end of the donut-shaped flow path, that is, the front end of the core, to form a solid-gas two-phase flow with good fluidity. It is used for transportation.

[Example] Fig. 1 is a sectional view of the main part showing a cutting device for a powder hopper which is an embodiment of this invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1 above, and Fig. 3 FIG. 2 is a partially sectional side view showing the installed state of the cutting device for the powder hopper. The same or corresponding parts as in FIG. 4 are indicated using the same reference numerals, and detailed explanation thereof will be omitted. In the figure, reference numeral 2 denotes a cylindrical casing that extends horizontally through the vicinity of the bottom of the cut-out portion 1, and this casing 2 has a slit-shaped inlet 4 extending along the entire circumference in the peripheral wall of the penetrating portion. There are several. 2A is a suction port at the front end of the on-off valve section 2B provided at the front of the casing 2; 2C is a flange for connecting the on-off valve section 2B to the front of the casing 2;
2D is the rear part of the casing, 2E is the rear part of the casing 2
The air introduction pipe 7 is connected to the air introduction port provided at D. Reference numeral 3 denotes a cylindrical core having an outer diameter approximately half the inner diameter of the casing 2, whose front and rear ends are closed with hemispherical or dish-shaped end plates, and the cutout 1 at the bottom of the hopper. It has a length approximately twice as long as the bottom length.
5 is a support member that supports the core 3 by positioning it at the axial center inside the casing 2; 6 is the casing 2 and the core 3;
8 is a dust collection chamber equipped with, for example, a bag-type dust collection filter, and 12 is equipped with a suction device to suck out dust D. The suction wheel 13 that accommodates and transports the powder is a suction pipe that connects the powder hopper cutting device and the suction wheel 12.

Next, the operation of the powder hopper cutting device (hereinafter referred to as the cutting device), which is an embodiment of the invention shown in FIGS. 1 to 3, will be described.

First, connect the suction port 2A of the cutting device to the suction tube 1.
3 to the suction wheel 12, and after starting the suction operation of the suction wheel 12, the on-off valve 11 is opened and the on-off damper 10 is opened. The dust D collected in the dust collection chamber 8 and stored in the hopper 9 is suctioned into the casing 2 from the hopper 9 through the opening/closing damper 10 of the cutting section 1 through the slit-shaped inlet 4 arranged in parallel. . A part of the dust D that has flowed in is stirred and mixed by the air flowing in from the air introduction pipe 7 and is conveyed toward the suction port 2A. Furthermore, part of the dust D that has flowed in from the inflow port 4 is transferred to the core 3.
The air collides and scatters on the outer peripheral surface of the air, mixes with the incoming air, and is conveyed toward the suction port 2A. Furthermore, core 3
A small amount of dust D continues to flow along the outer peripheral surface of
The air is stirred and mixed with the incoming air in the casing 2 below the core 3, and then transported toward the suction port 2A.

Even if a large amount of dust D falls down and fills the bottom of the cutting section 1, while suction is being performed,
The dust D is suctioned into the donut-shaped flow path formed by the casing 2 and the core 3 little by little from the parallel slit-shaped inlets 4, and can be transported while being stirred and mixed with the air. Therefore, the donut-shaped flow path is not blocked, and the dust D is continuously and smoothly transported by air.

The partition plate 6 prevents the molded part of the inlet 4 from being deformed when a large amount of dust D falls onto the casing 2, and also improves the agitation and mixing of air and dust D within the donut-shaped channel. .

The air introduction pipe 7 may be open to the outside of the apparatus, but it may also be communicated with the upper part of the dust D accumulated on the upper part of the hopper 9 to prevent the dust D from leaking to the outside, as shown in FIG.

[Effects of the invention] As described above, in this invention, the structure of the means prevents the inside of the casing from being clogged even when a large amount of powder or granular material such as dust falls into the lower part of the hopper. Smooth air conveyance of powder and granules is performed.Therefore, there is no need to install a spare powder hopper or conveyor, and the structure is simple and has no moving parts other than the opening/closing hopper and opening/closing valve. This provides excellent effects such as being able to obtain a powder hopper cutting device that is easy, inexpensive, and easy to maintain.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main parts of a cutting device for a powder hopper which is an embodiment of this invention, Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, and Figure 3 is a cross-sectional view of the powder hopper. FIG. 4 is a cross-sectional view showing an example of a conventional powder hopper cutting device, and FIG. FIG. 7 is a sectional view showing another example of the output device. In the figure, 1...cutout part, 2, 20, 22...
...Casing, 2A, 20A...Suction port, 20
-1...Casing front part, 2B...Opening/closing valve part, 2
C...flange, 2D, 20-2...casing rear, 2E...air inlet, 3...core, 4...
Inflow port, 5... Support member, 6... Partition plate, 7...
... Air introduction pipe, 8 ... Dust collection chamber, 9, 28 ... Hopper, 10 ... Opening/closing damper, 11... Opening/closing valve, 1
2... Suction wheel, 13, 25... Suction pipe, 21...
Screw, 21A... Screw shaft, 23...
Outer ring part, 24... guide vane, 26... air inlet, 27... water jet. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] An opening/closing damper is provided in the lower part of the powder hopper, and a cylindrical casing is provided horizontally penetrating the bottom of the hopper, an air inlet is provided at the rear end of the casing, and an opening/closing valve is provided at the front end. A plurality of inlets are provided on the peripheral wall of the portion of the casing that passes through the bottom of the hopper for introducing the powder into the casing, and furthermore, a plurality of inlets are provided at the axial center of the casing. A cutting device for a powder hopper, characterized in that a core is provided in a predetermined area within the casing to form a flow path having a donut-shaped cross section.