JPH0576803A - Cyclone type dust collector and dust collecting method - Google Patents

Abstract

PURPOSE:To simplify the work of removing dust stuck to a dust collecting filter and carry out said dust removing work during the operation of a dust collector. CONSTITUTION:A dust collecting filter 9 is arranged almost concentrically in a cyclone cylinder 1 provided with a gas introduction inlet 3 communicating with a dust removing gas suction hose 5 and a discharge outlet 6 communicating with a discharge hose 8. In the dust collector 50, a pulse jetting pipe 13 for feeding intermittently pressurized gas for removing dust stuck to the surface 9a of a dust collecting filter 9 is arranged in a space 11 in the dust collecting filter 9. The pulse jetting pipe 13 or the dust collecting filter 9 can be installed rotatably, and the site where the pulse jetting pipe 13 and the dust collector 9 facing each other can be changed. When the pressurized gas is jetted from the pulse jetting pipe 13 to the inner face of the dust collecting filter 9, the dust stuck to said surface 9a can be brushed off and dust collecting operation can be restored without discontinuing the operation of the dust collector 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cyclone type dust collecting apparatus and a dust collecting method, and more specifically, it includes, for example, so-called spatters and smoke-like fumes having various particle sizes generated during work such as welding and cutting. Dust gas is sucked into the cyclone cylinder, coarse dust is separated and removed from the dust gas by the cyclone effect, and fine dust is collected by the dust collection filter installed in the cyclone cylinder. The present invention relates to a dust collecting device and a dust collecting method capable of quickly and surely removing dust adhered to a dust gas even during a dust gas suction operation.

[0002]

2. Description of the Related Art As shown in FIG. 8, a cyclone cylinder 3 is used as a dust collecting device which has been used conventionally.
In some cases, a discharge port 30a and a gas introduction port 30b are provided at the center of the top and the upper peripheral portion of 0, and a cyclone cylinder 30 is provided with a dust collecting filter 31 formed in a cylindrical shape concentrically. A lead-out hose 32 connected to a suction device (not shown) on the downstream side is connected to the lead-out port 30a, while a dust gas suction hose 33 is connected to the gas inlet port 30b.
Is attached. When the suction device operates, the dust collector enters an operating state, and when the inside of the cyclone cylinder 30 becomes a negative pressure, for example, from the openings 33a and 33b on the tip side of the dust gas suction hose 33 facing the vicinity of the welding work site. The dust gas is sucked and becomes a swirling flow along the inner wall of the cyclone cylinder 30. The coarse dust in the dust gas is separated and settled by the cyclone effect and gravity due to the centrifugal force acting during the swirling, and the dust collection bag 34 attached to the lower part of the dust collector.
Will be collected. On the other hand, fine dust or the like in the dust gas is collected on the surface of the dust collection filter 31 in which the internal space has a large negative pressure, and clean air is discharged from the discharge hose 3
It is discharged to the 2 side. When the collection of dust and the like by the dust collecting filter 31 progresses in this way, the dust collecting filter 31 is clogged, the suction force of the dust collecting device is reduced, and the cyclone effect is reduced. In order to recover the reduced suction force and the reduced dust collecting action as described above, the operation of the dust collecting device is stopped, the dust collecting filter 31 is periodically taken out to remove dust, or a new prepared dust is prepared. Must be exchanged for something. On the other hand, as an example in which dust adhering to the dust collecting filter is mechanically removed, there is disclosed in Japanese Patent Laid-Open No.
There is a filter cleaning device described in 0-261522 and a dust collecting device as shown in FIG. In both cases, the cylindrical dust collecting filter 31 is rotated after the dust collecting function is stopped, and the attached dust is scraped off by the vibration of the claw 40 having the folds 31a formed on the surface thereof. .. In the example of FIG. 9, the cyclone cylinder 3
A gear 35 is provided above the dust collecting filter 31 housed in 0.
Is attached, a pinion 36 meshing with the gear 35 is provided, and a manual handle 37 for rotation is attached to a pinion shaft that penetrates the top of the cyclone cylinder 30. Further, in the annular space formed between the inner peripheral surface of the cyclone cylinder 30 and the dust collecting filter 31, the shaft 3
8 and a plurality of dust removing plates 3 attached to the shaft 38 thereof
9A and 39B are installed. The dust removing plate 39 has an inner surface 39a on which the dust removing claws 4 extending in the vertical direction extend.
0 is molded, and each claw 40 is in a state of being constantly in contact with the fold 31a of the dust collecting filter 31. And
When a large amount of dust adheres to the dust collecting filter 31 as the dust collector operates, a manual handle 37 is provided to remove the dust.
Is turned. The claw 40 is the fold 31a of the dust collecting filter.
By sequentially repelling, the dust adhering to the folds 31a of the dust collecting filter is brushed off. In this way, dust is removed over the entire circumference of the dust collecting filter 31.

[0003]

By the way, also in the cleaning device of Japanese Patent Laid-Open No. 60-261522 and the example of FIG. 9, the dust collecting device is stopped to remove the dust adhering to the dust collecting filter. There is a problem that the operation rate of the dust collector is significantly reduced because it will be performed later. The separated dust that does not fall completely adheres to the dust collection filter 31 again when the suction device is restarted, so the dust removal is smooth and time consuming. There is a problem that it is difficult to do. In addition, the dust plate 39
Is disposed in the passage of the swirling flow of the dust gas, the swirling flow of the dust gas is likely to be disturbed during the dust collection operation, and the cyclone effect is reduced, so that the dust collection is hindered. The present invention has been made in view of the above problems, and an object thereof is that dust removal can be performed quickly and smoothly over the entire circumference of the dust collection filter, and dust removal work of the dust collection filter is possible even during operation of the dust collection device. Therefore, it is possible to maintain a high operation rate of the dust collector, the swirling flow of dust gas in the cyclone cylinder is not disturbed, and the cyclone effect is constantly maintained.
It is an object of the present invention to provide a cyclone-type dust collecting apparatus and a dust collecting method that can efficiently collect and collect dust with various particle sizes during dust collection.

[0004]

According to the present invention, the gas inlet connected to the dust gas suction hose is opened facing the tangential direction of the cyclone cylinder, while the outlet connected to the discharge hose connected to the suction machine is provided. , A top of the cyclone cylinder is opened, and a cylindrical dust collecting filter is concentrically arranged in the cyclone cylinder to form an annular space between the cyclone cylinder and the inner peripheral surface of the cyclone cylinder. Applied to dust equipment. The feature is that referring to FIG. 1, a pressure gas for removing dust adhering to the surface of the dust collecting filter 9 is supplied to the internal space 11 of the dust collecting filter 9, for example, compressed air supply. The air tube 13 for use is inserted. The pressure gas supply pipe 13 is
Of the switching valve, such as the solenoid valve 14, that is arranged on the upstream side of the
It is advisable to use a pulse jet tube in which the pressure gas is intermittently supplied in the off operation. As shown in FIG. 4, the pressure gas supply pipe 18 may be rotatably attached to the cyclone cylinder 1. As shown in FIG. 6, the dust collecting filter 21 may be rotatably attached to the cyclone cylinder 1. In the invention of the method, the suction device connected to the outlet hose sucks the internal air of the cyclone cylinder from the top of the cyclone cylinder, and the dust gas introduced from the tangential direction of the cyclone cylinder is introduced into the cyclone cylinder. In the annular space formed between the cyclone cylinder and the cylindrical dust collecting filter provided inside the cyclone cylinder, by swirling the dust gas, centrifugally separating the coarse dust to collect the dust. It is applied to a dust collection method that collects fine dust with a dust collection filter. The feature is that, with reference to FIG. 1, during the suction operation of the dust gas, pressure gas is supplied from the inside of the dust collection filter 9 to remove the dust adhering to the surface 9a of the dust collection filter 9. That is to remove it. Note that the pressure gas can be intermittently supplied during the suction operation of the dust gas. During the suction operation of the dust gas, the pressure gas supply pipe 18 arranged in the internal space 11 of the dust collection filter 9 (see FIG. 4).
The supply pipe 18 can be rotated with respect to the dust collecting filter 9 when the pressurized gas is supplied from On the contrary, when the pressure gas is supplied from the pressure gas supply pipe 13 arranged in the internal space 11 of the dust collecting filter 21 (see FIG. 6) during the dust gas suction operation, the gas is collected to the supply pipe 13. The dust filter 21 may be rotated.

[0005]

When the dust collector is operated, the air in the cyclone cylinder 1 is sucked through the internal space 11 of the dust collecting filter 9, and the dust gas is sucked from the dust gas suction hose 5 facing the welding work site. It is introduced into the cyclone cylinder 1. Since the gas inlet 3 is opened facing the tangential direction of the cyclone cylinder 1, the dust gas becomes a swirling flow in the annular space 10. The dust gas contains coarse dust, fine dust, smoke-like fumes, etc., but the coarse dust is biased to the inner peripheral surface 1d of the cyclone cylinder 1 by the centrifugal force acting by the cyclone effect. And then settles due to gravity. On the other hand, a part of the swirling flow flowing through the annular space 10 passes through the dust collecting filter 9 and is sucked. When the gas permeates to the inner space 11 side, fine dust in the dust gas is collected by the dust collecting filter 9 and a clean gas is discharged. The surface 9 of the dust collecting filter 9 by the dust collecting action
When a large amount of dust adheres to a, the permeation of gas is hindered and the suction force of the suction device is reduced. When the dust collection effect is significantly reduced, in order to recover the suction force and the dust collection function, the pressure gas becomes a pulse jet from the pressure gas supply pipe 13 and is jetted toward the dust collection filter 9. This intermittent jet flow injection is repeated several times, and the dust that has adhered to the surface 9a of the dust collection filter 9 and is agglomerated into a solid state is peeled off, scattered, and dropped by the swirling flow of the cyclone cylinder 1. Settled and collected.
The pulse jet may be jetted during the operation of the dust collector 50, and the negative pressure in the cyclone cylinder 1 is lowered by the supply of the pressure gas by the pulse jet, and the suction force of the dust gas from the dust gas suction hose 5 is obtained. Will only be weakened. Therefore, it is not necessary to stop the dust collector 50 for dust removal work. As shown in FIG. 4, the pressure gas supply pipe 18 is rotated with respect to the dust collecting filter 9,
Alternatively, as shown in FIG. 6, when the dust collecting filter 21 is rotated with respect to the supply pipe 13, the dust collecting filters 9 and 21 are rotated.
It is possible to inject a pressure gas to the entire inner surface of, and the adhered dust can be removed quickly.

[0006]

According to the present invention, the dust removing work for removing the dust adhering to the dust collecting filter can be speeded up, and the reduced suction force of the dust collecting device can be quickly restored by saving time and labor. You can The dust removal work can be performed even while the dust collector is in operation, and the operation efficiency of the dust collector can be significantly improved compared to the conventional dust removal work that was possible only when the dust collector was stopped. .. Moreover, since the dust-dispersing plate or the like that has been conventionally used does not exist in the annular space that forms the swirling flow, the cyclone effect is constantly maintained high, and the dust collecting function of the cyclone device can be fully exerted. If a pulse jet pipe that intermittently supplies pressure gas is adopted in the opening / closing operation of the switching valve arranged on the upstream side of the pressure gas supply pipe, the impact force due to intermittent pressure gas causes
The effect of removing the dust adhering to the dust collecting filter is further enhanced. If the pressure gas supply pipe is rotatably attached to the cyclone cylinder or the dust collection filter is rotatably attached to the cyclone cylinder, dust can be sufficiently removed over the entire circumference of the dust collection filter. Therefore, the reduced suction force of the dust collector can be completely and rapidly recovered.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 shows a dust collecting filter 9
FIG. 3 is a cross-sectional view of a cyclone-type dust collecting device 50 in which the fixed pulse jet tube 13 is fixed in the cyclone cylinder 1. The cyclone cylinder 1 is composed of a cylinder body 1A and a lid body 1B. The cylinder body 1A has an upper side formed in a cylindrical shape and a lower side formed in an inverted conical shape. The short pipe 1C is integrated. The conical valve body 2 suspended by the wire 2a is accommodated in the short pipe 1C, while the valve seat 2b is formed on the inner circumference of the connecting portion between the cylinder body 1A and the short pipe 1C. When the lever 2c attached with the upper end of is operated from the outside, the valve body 2 can be raised and the valve seat 2b is closed. When the valve is lowered, a passage is opened between the valve seat 2b and the valve body 2, and the dust accumulated on the valve body 2 is collected by the dust collecting bag 1
6 can be thrown in. A gas introduction port 3 is opened in the upper peripheral portion of the cylinder body 1A so as to be tangential to the inner peripheral surface 1d on the upper side of the cyclone cylinder 1, and a gas suction pipe 4 is connected to the gas introduction port 3. Further, a dust gas suction hose 5 is connected to the gas suction pipe 4. Then, when a suction device described later is activated and the inside of the cyclone cylinder 1 becomes a negative pressure, dust gas including so-called spatter and smoke-like fumes of various particle sizes generated during work such as welding and cutting is sucked into the dust gas. Opening 5 on the tip side of hose 5
It is adapted to be sucked from a and 5b and then sucked into the cyclone cylinder 1. A lead-out port 6 is opened at the center of the top of the lid 1B, and a suction pipe 7 vertically inserted into the cyclone cylinder 1 is attached to the lead-out port 6. The lower end of the suction pipe 7 is bent toward the internal space 11 of the dust collecting filter 9 described later, while being bent in the horizontal direction.
An outlet hose 8 is attached to the upper part of the. A suction device (not shown) is installed downstream of the outlet hose 8. In the vicinity of the uppermost part of the cylindrical portion of the cylinder body 1A,
A support member 1a of an annular plate material is provided, the outer peripheral portion of the support member 1a is welded to the inner peripheral surface 1d of the cyclone cylinder 1, and a reinforcing rib material 1b is attached to a required portion below the support member 1a by welding or the like. .. On the other hand, the lid member 9A integrated with the dust collecting filter 9 is fixed to the upper surface on the inner peripheral side of the supporting member 1a, and the outer surface 9a of the cylindrical dust collecting filter 9 and the inner peripheral surface 1d of the cylinder body 1A are separated. An annular space 10 is formed therebetween and is suspended in the cyclone cylinder 1. Then, the lower end of the suction tube 7 is inserted into the opening 9b provided in the lid member 9A,
And the internal space 11 of the dust collecting filter 9 communicate with each other. The dust collecting filter 9 is a commonly used filter element such as a filter paper or a sintered metal having fine through holes, and is formed into a cylindrical body as shown in the drawing, and its surface 9a extends vertically. It has a large number of pleats 9c to increase the dust collecting area. The dust collecting filter 9 collects fine dust and oil from the dust gas, and enters the internal space 11 whose lower portion is closed by the blind lid 9B.
Only gas can pass through.
The dust gas sucked from the dust gas suction hose 5 into the cyclone cylinder 1 by the operation of the suction device flows downward in the annular space 10 as a swirling flow as indicated by a white arrow. In the meantime, coarse dust is subjected to centrifugal force and blown in the radial direction,
After that, the fine dust is collected by the outer surface 9a of the dust collecting filter 9 while being settled by gravity along the inner peripheral surface 1d of the cyclone cylinder 1. And the dust collecting filter 9
The clean gas that has passed through is discharged to the suction device side through the internal space 11. When the dust collector 50 is continuously operated at a welding site or the like and the dust collection by the dust collection filter 9 continues, the dust 9 attached causes the surface 9a to be clogged, and the dust collection effect of the dust collection filter 9 decreases. Or the suction force of the dust collector 50 is reduced. A supply pipe of pressure gas for dust removal for scattering the attached dust and recovering the suction force of the dust collector 50, for example, an air pipe 13 for supplying compressed air is provided. In this example, the air pipe 13 extends vertically through the center position of the suction pipe 7 and the center of the internal space 11 of the dust collecting filter 9. The air tube 13 is horizontally bent at a position slightly above the lid 1B and is fixed by penetrating the tube wall of the suction tube 7. In addition, a packing material (not shown) is disposed at a portion where the air tube 13 penetrates the suction tube 7,
Airtightness is maintained. A blind lid 13a is attached to the lower end of the vertical air pipe 13, and a switching valve, for example, a solenoid valve 14 is interposed in the horizontal portion of the upper end thereof.
Is connected to an air tank 15 that stores compressed air from a compressor (not shown). The solenoid valve 1
When the communication and interruption of the flow path are intermittently performed by the ON / OFF operation of 4, the compressed air in the air tank 15 is intermittently supplied to the air pipe 13. Therefore, the air pipe 1
3 functions as a pulse jet tube. Then, a plurality of pulse jets 13 for vertically ejecting a pulse jet toward the inner surface of the dust collecting filter 9 are scattered through the pulse jet tube 13 which extends vertically through the inner space 11 of the dust collecting filter 9. The injection holes 13b, 13b are provided, for example, in a vertical row. For example, when the solenoid valve 14 is operated by a command from the control panel or the like, a pulse jet is jetted from the jet hole 13b for 0.3 to 2.0 seconds, and the solenoid valve 14
When the flow of the pulse jet tube 13 is cut off, the jet flow is stopped. In addition, during operation of the dust collector 50, the valve body 2 below the cyclone cylinder 1 is lifted up as shown by a chain double-dashed line,
When the suction is stopped or the pulse jet is generated, the valve body 2 is lowered to the position indicated by the solid line to form a passage around the valve body 2 through which dust passes, and the short pipe 1
Dust can be stored in the dust collection bag 16 attached to C.

The cyclone type dust collector 50 thus constructed operates in the following manner to collect and collect the dust in the dust gas and remove the dust adhering to the dust collecting filter 9. be able to. When the suction device is operated with the dust collecting device 50 installed at a welding site or the like, the air in the cyclone cylinder 1 causes the air inside the cyclone cylinder 1 to be in the internal space 1 of the dust collecting filter 9.
1, sucked through the suction pipe 7 and the outlet hose 8, and the inside of the cyclone cylinder 1 becomes negative pressure. Then, the openings 5a, 5b on the tip side of the dust gas suction hose 5 facing the welding work site.
The dust gas is sucked from the inside of the cylinder main body 1A through the gas suction pipe 4 and the gas introduction port 3. Since the gas introduction port 3 is opened facing the tangential direction of the inner peripheral surface 1d of the cyclone cylinder 1, the dust gas introduced into the cylinder body 1A forms a swirling flow in the annular space 10 as shown by the white arrow. ..
The dust gas contains coarse dust and fine dust generated during welding, fumes in the form of smoke, and oil depending on the type of dust gas. A centrifugal force acts on the coarse dust by the cyclone effect, and the coarse dust is biased to the inner peripheral surface 1d of the cylinder body 1A and then settles by gravity. At this time, since the lever 2c is pulled up like the chain double-dashed line, the valve body 2 connected to the wire 2c is seated on the valve seat 2b, and dust is deposited on it. On the other hand, the annular space 1
A part of the swirling flow flowing through 0 passes through the surface 9a and is sucked upward. When the gas permeates to the inner space 11 side, the fine dust in the dust gas is collected by the dust collecting filter 9, and the clean gas is discharged to the suction device side. When the dust collection continues as described above, dust adheres to the outer surface 9a of the dust collection filter 9, which hinders gas permeation and significantly reduces the suction force of the suction device, greatly reducing the dust collection effect. To do. In order to recover the suction force and the dust collection function, press the operation button of the control panel during dust collection and the solenoid valve 1
4 is turned on and the state is maintained for 0.3 to 2.0 seconds. The compressed air supplied from the air tank 15 to the pulse jet pipe 13 becomes a pulse jet from the injection hole 13b and is jetted toward the inner surface of the dust collecting filter 9. This intermittent jet flow is repeatedly jetted several times, and the solidified dust that adheres to the surface 9a of the dust collection filter 9 and agglomerates is separated and scattered. The dust falls, is settled by the swirling flow of the cyclone cylinder 1, and is collected without adhering to the dust collecting filter 9 again. Note that the pulse jet may be performed while the operation of the dust collector 50 is stopped, but it may be performed during operation. In that case, the negative pressure in the cyclone cylinder 1 is lowered by the supply of a large amount of air by the pulse jet, and the suction from the openings 5a and 5b is only weakened, and it is not necessary to stop the dust collector 50 each time. Absent. During injection of the pulse jet, the negative pressure becomes low as described above,
The state where the valve body 2 is adsorbed on the valve seat 2b is weakened, and
You can easily lower it by operating. Therefore, even during operation of the suction device, the dust accumulated below can be stored in the dust collection bag 16 through the passage formed between the valve body 2 and the valve seat 2b. Thus, the dust removal work is performed even while the dust collector 50 is in operation, so that the operation rate of the dust collector is improved as compared with the conventional dust removal work in which the dust collector 50 is stopped one by one. be able to.

Incidentally, in order to further enhance the dust removing effect in the dust collector 50, instead of providing the injection holes 13b in a single vertical line as described above, as shown in FIG. Injecting holes 13 at several places
b can be drilled. Of course, the injection holes may be arranged in a lattice pattern or a staggered pattern in a state where the pipe surface is expanded. In such cases,
Since the pulse jet can be jetted from almost the entire circumference of the pulse jet tube 13, dust can be completely removed over the entire surface of the dust collection filter 9, and the reduced suction force can be recovered reliably and promptly.

FIG. 3 shows a dust collector 60 of another example, in which the pulse jet tube 13 which is vertically passed through the suction tube 7 is shortened,
The dust collecting filter 9 is opened on the upper side, and compressed air can be jetted into the internal space 11 of the dust collecting filter 9 from the opening. In this case as well, the dust removing effect can be exhibited as in the case of the dust collector 50.

FIG. 4 shows an example of a dust collector 70 in which the pulse jet tube 18 can be rotated. The difference from the dust collector 50 described above is that the pulse jet tube 18 includes an upper fixed pipe 18A, a rotary joint 17, and a lower rotary pipe 18B. As shown in FIG. 5, the rotary joint 17 includes a flange 18a of a fixed pipe 18A, a flange 18b of a rotary pipe 18B, and both flanges 18a, 1a.
8b and a cover member 18C having a sliding function for maintaining relative connection and allowing relative rotation.
As a result, the rotary pipe 18B is favorably suspended through the flange 18b, and the flange 18b is suspended.
The upper surface 18c of the rotary pipe 18B and the lower surface 18d of the flange 18a of the fixed pipe 18A are slidable so that the rotary pipe 18B
Is allowed to rotate. Since air leakage at this portion is not preferable, it is advisable to interpose packing having good slidability between the opposed surfaces of both pipes 18A and 18B. By the way, both pipes 18A, 1
The cover member 18C is bolted with the surface 8B in surface contact. The rotary drive device for the rotary pipe 18B is shown in FIG.
Pinion 19B mounted on its outer surface as shown in FIG.
A gear 19A having a rotating shaft 19a, and a rotating shaft 19a
And a motor 20 having a built-in speed reduction mechanism connected to the. Then, the gear 19A located in the space 12 is considered to be well projected from the gap provided in the tube wall of the suction tube 7,
The rotating pipe 18B can be rotated in the suction pipe 7. The circumference of the rotary shaft 19a is designed to be airtight by using a sealing material or the like. Incidentally, the injection holes 18f provided in the pulse jet tube 18 can be arranged by selecting an arbitrary number in the same manner as described above.

In the dust collecting apparatus 70 thus constructed, when dust adheres to the dust collecting filter 9 to impede gas permeation and the suction force of the suction device is reduced, it is recovered as follows. When the operation button on the control panel is pressed while the suction device is operating, the solenoid valve 14 is turned on and the state is maintained for 2.0 seconds, which is 0.3 minutes. Then, from the air tank 15 to the pulse jet tube 1
The compressed air supplied to 8 becomes a pulse jet from the injection hole 18f and is intermittently injected to the dust collecting filter 9. On the other hand, at the same time, the motor 20 is driven and the gear 19A
And the pinion 19B is rotated, and the rotary pipe 18B via the rotary joint 17 is rotated. As a result, the pulse jet ejected from the ejection hole 18f can separate the dust adhering over the entire circumference of the surface 9a of the dust collecting filter 9 formed in a cylindrical shape. The separated dust is collected in the same manner as described with reference to FIG.

FIG. 6 shows an example of a further different dust collector 80. In this dust collecting device 80, the dust collecting filter 21 is rotated. The dust collecting filter 21 is provided with the lid member 21A integrated on the upper part thereof together with the cylinder body 1A.
It is rotatably held by an annular support member 1a extending inwardly from the inner peripheral surface 1d on the upper side. That is, the bearing body 22 shown in FIG. 7 is fixed to the outer peripheral portion of the lid member 21A and is slidably mounted on the upper surface of the inner peripheral portion of the support member 1a.
The outer peripheral surface of the lower portion thereof can also slidably contact the inner peripheral surface of the support member 1a, and the position of the dust collecting filter 21 is stably regulated. On the other hand, a motor 23 for driving the dust collecting filter 21 is provided on the upper surface of the lid 1B of the cyclone cylinder 1, and the output shaft 23a inserted into the space 12 formed inside the lid 1B has an output shaft 23a. , The pinion 24A is attached by a nut. The upper cover 21B around which a gear 24B that meshes with the pinion 24A is formed is integrated with the lid member 21A integrated with the bearing body 22 by a bolt (not shown) in a state where the lower surface 21n and the upper surface 21m of the lid member 21A are in surface contact. Has been converted. In this way, a mechanism for rotating the dust collecting filter 21 is formed, and the gas that has passed through the dust collecting filter 21 can be led out to the suction hose 8 through the hole provided in the center of the upper cover 21B. ing. By the way, when the dust collecting filter 21 is incorporated in the cylinder body 1A of the cyclone cylinder 1, first, the dust collecting filter 21 is placed on the support member 1a via the lid member 21A integral with the bearing body 22. Top cover 21
With the O-ring 25 for sealing interposed on the lower surface 21n of B, the upper portion of the bearing body 22 is fitted into the annular recess provided in the outer peripheral portion thereof, and the lid member 21A is connected to the upper cover 21B as described above. Bolt down. It is sufficient to attach the pinion 24A to the gear 24B while the pinion 24A is engaged with the motor 23. The lower part of the suction tube 7 and the upper cover 2
A short tube 7A having a flange is arranged between the top of 1B and it, and it is attached to the suction tube 7 side. The short tube 7A
With the inner surface of the, a passage that connects the internal space 11 of the dust collection filter 21 and the inside of the suction pipe 7 is formed, and
The lower surface of the short pipe 7A comes into contact with the top of the upper cover 21B, and the smooth rotation is achieved.

In such an example, the dust collecting filter 21 is rotated by the motor 23. On the other hand, since the negative pressure of the cyclone cylinder 1 is reduced while the compressed air is being jetted from the pulse jet tube 13, the negative pressure generated by the suction device pulls the cyclone 1 upward while the compressed air is not jetted. The dust filter 21 also supports the supporting member 1a by its own weight.
It can be easily rotated by a rotating mechanism using gears. If the pulse jet tube 13 is rotated in that state, the dust adhering to the entire surface 21a of the dust collecting filter 21 can be scattered. In this case, it is preferable that the pulse jet tube 13 arranged in the internal space 11 is arranged at a position eccentric to the dust collecting filter 21. This allows
There is an advantage that the distance that the jet of the pulse jet hits the inner surface of the dust collecting filter 21 is shortened and the dust removing effect is improved.

As can be seen from the above description, even if the dust gas sucked into the cyclone cylinder and swirling contains coarse dust, fine dust and welding fume, it is easy to collect dust from the dust gas. Done Then, even if no dust-dispelling plate that prevents the formation of the swirling flow is provided, and even during the dust-collecting operation in which the suction device is operating, the dust attached to the dust-collecting filter can be removed. Therefore, the dust collecting action of the dust collecting filter can be recovered quickly even during operation. In addition, if the pulse jet tube or the dust collecting filter is rotatably provided, the dust removal over the entire circumference of the dust collecting filter can be performed more efficiently.

In the above description, the dust is removed by operating the operation button, but the detector can be provided for automation. That is, a pressure detector is arranged in the internal space 11 of the dust collecting filter, and it is detected by the pressure detector that the suction force as the dust collecting device is below a predetermined state, and dust is automatically removed each time. It can also be done. Further, if the valve body 2 can be opened and closed with respect to the valve seat 2b, it is advantageous because the lower portion of the cyclone cylinder 1 can be kept airtight except when collecting the dust accumulated on the valve body 2. When the dust collector has a constant shape that does not deform, the dust collector and the lower portion of the cyclone cylinder 1 can be airtightly held, and therefore the valve body 2 may be fixed to the valve seat 2b. it can. If compressed air is supplied to remove dust, it can be used inexpensively and easily. Nevertheless, if pressure gas is used for welding or cutting work, it can be diverted. For example, in arc welding work,
Carbon dioxide gas or carbon dioxide gas mixed with oxygen is used as a so-called shield gas, but the pressure gas as the shield gas can also be used for dust removal.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a dust collecting apparatus in which a pressure gas supply pipe is arranged in order to realize the cyclone type dust collecting method of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view of a dust collector having different supply pipes.

FIG. 4 is a vertical cross-sectional view of a dust collector having a rotating supply pipe.

FIG. 5 is a structural explanatory view of a rotary joint.

FIG. 6 is a vertical cross-sectional view of a dust collecting apparatus having a rotating dust collecting filter.

FIG. 7 is a partially enlarged cross-sectional view of a gear type rotating mechanism of the dust collecting filter.

FIG. 8 is a vertical cross-sectional view of a conventional dust collector.

FIG. 9 is a vertical cross-sectional view of a conventional dust collecting device including a dust removing plate.

[Explanation of symbols]

1 ... Cyclone cylinder, 1d ... Inner peripheral surface, 3 ... Gas inlet port, 5
... Dust removal gas suction hose, 6 ... Outlet port, 8 ... Outlet hose,
9, 21 ... Dust collection filter, 9a, 21a ... Surface, 10
... annular space, 11 ... internal space, 13, 18 ... pressure gas supply pipe (air pipe, pulse jet pipe), 14 ... switching valve (solenoid valve).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Iwao Komori 2-1-1, Tagawa, Yodogawa-ku, Osaka-shi, Osaka Prefecture Daihen Co., Ltd. (72) Koji Fukuba 2--1, Tagawa, Yodogawa-ku, Osaka-shi, Osaka No. 11 Daihen Co., Ltd.

Claims (8)

[Claims] 1. A gas inlet connected to the dust gas suction hose is opened facing the tangential direction of the cyclone cylinder,
A lead-out port connected to a lead-out hose connected to a suction machine is opened at the top of the cyclone cylinder, and the cyclone cylinder has
In a dust collecting device in which a cylindrical dust collecting filter is concentrically arranged with forming an annular space between the inner peripheral surface of the cyclone cylinder, the dust collecting filter is provided in the inner space of the dust collecting filter. A cyclone-type dust collector, in which a supply pipe for supplying pressure gas for removing dust adhering to the surface of the dust filter is inserted. 2. The supply pipe is a pulse jet pipe to which a pressure gas is intermittently supplied by opening / closing operation of a switching valve arranged on the upstream side of the supply pipe.
Cyclone type dust collector described in. 3. The cyclone dust collecting apparatus according to claim 1, wherein the supply pipe is rotatably attached to the cyclone cylinder. 4. The cyclone type dust collecting apparatus according to claim 1, wherein the dust collecting filter is rotatably attached to the cyclone cylinder. 5. A suction device connected to the outlet hose,
The air inside the cyclone cylinder is sucked from the top of the cyclone cylinder, and the dust gas introduced from the tangential direction of the cyclone cylinder is sucked into the cyclone cylinder, and the cyclone cylinder and the cylindrical collection provided inside the cyclone cylinder. In the annular space formed between the dust filter and the dust gas, the dust gas is swirled to collect coarse dust by centrifugal separation, while fine dust is collected by the dust filter. 3. The cyclone type dust collecting method, wherein during the suction operation of the dust gas, pressure gas is supplied from the inside of the dust collecting filter to remove the dust adhering to the surface of the dust collecting filter. 6. The cyclone type dust collecting method according to claim 5, wherein the pressure gas is intermittently supplied during the suction operation of the dust gas. 7. When the pressure gas is supplied from a supply pipe arranged in the internal space of the dust collecting filter during the suction operation of the dust gas, the supply pipe is rotated with respect to the dust collecting filter. The cyclone type dust collecting method according to claim 5 or claim 6 characterized in that. 8. When the pressure gas is supplied from a supply pipe arranged in the internal space of the dust collecting filter during suction operation of the dust gas, the dust collecting filter is rotated with respect to the supply pipe. The cyclone type dust collecting method according to claim 5 or claim 6 characterized in that.