JP2000126710A - Method and apparatus for duct collection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance of a filter in bag filter type dust collector, while dust is efficiently collected by a simple mechanism. SOLUTION: In the dust collector 31, dust generated in working of a work by a machine tool together is sucked with air into the dust collector main body 37, and the dust is collected to discharge clean air. In this case, a conductor 57 is stretched around along the inner wall surface of the dust collector main body 37, and a magnetic field is generated in the conductor 57 by energizing the conductor 57. When minute fumes comprising a magnetic substance generated in working by thermal cutting pass through the dust collector main body 37, and they are attracted to the conductor 57 due to the magnetic field. Further, when an electric current of the conductor 57 is interrupted, the dust attracted to the conductor 57 drops easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collector for sucking dust generated during the processing of a workpiece with air by a thermal cutting machine such as a plasma processing machine or a laser machine, or a machine tool such as a punch press together with air. The present invention relates to a dust method and a dust device.

[0002]

2. Description of the Related Art Conventionally, there are a bag filter type dust collecting apparatus and a mechanical filter type dust collecting apparatus such as an inertial dust collecting type and a cyclone type.

As shown in FIG. 6, in a bag filter type dust collecting apparatus 101A, a dust collecting chamber 105 for separating dust from air and dust and collecting the dust is provided in a lower part of the inside of a dust collecting apparatus main body 103. In the upper part, an exhaust chamber 107 for discharging the clean air to the outside is provided.

The dust collecting chamber 105 is provided with a suction port 109 for sucking air containing dust.
A plurality of filters 113 are provided in a communication port 111 between the air conditioner and the exhaust chamber 107. A dust box 115 is disposed below the dust collection chamber 105 for discarding dust that has fallen and accumulated.

[0005] In the upper part of the exhaust chamber 107, an exhaust port 117 for exhausting air and an exhaust fan 123 composed of an exhaust fan 121 rotated by a motor 119 are provided. Further, a pulsed air valve unit 125 (air injection device) that periodically and instantaneously injects compressed air into the plurality of filters 113 is provided in the exhaust chamber 107.

Therefore, when the exhaust fan 121 rotates, a negative pressure is generated inside the dust collecting device main body 103, so that air containing dust is sucked from a processing table of, for example, a plasma processing machine as a machine tool, and an unillustrated collection is performed. The dust flows into the dust collecting chamber 105 from the suction port 109 via the dust duct, and the air in the dust collecting chamber 105 flows into the exhaust chamber 107 through the plurality of filters 113. At this time, dust adheres to the outer surfaces of the plurality of filters 113 and is separated from air. Exhaust chamber 10
The clean air in 7 is exhausted from the exhaust port 117 to the outside.

[0007] When compressed air is periodically and instantaneously injected into each of the plurality of filters 113 by the pulsed air valve unit 125, dust adhering to the outer surface of the filter 113 is removed by the compressed air. Since the dust contains fumes generated during the plasma processing, a precoat material such as calcium carbonate is applied to the outer surface of each filter 113 in advance so that the fumes are not directly attached.

Although not shown as an inertial dust collecting type dust collecting apparatus, an ultra-thin filter laminated in a multilayer structure is provided in the main body of the dust collecting apparatus, and when air containing dust passes through the ultra-thin filter. Dust having a large mass collides with the wall surface of the ultra-thin filter and falls downward, and small dust passes through the gap of the ultra-thin filter and is discharged to the outside.

As the cyclone type dust collector 101B,
As shown in FIG. 7, the cross section of the cyclone chamber 127 provided in the dust collector main body 103 has a substantially circular cross section, and a discharge duct 129 projecting inward is provided substantially in the center of the upper wall surface. ing. In addition, a suction duct 131 protruding outward from the side wall surface is provided above the side wall surface of the cyclone chamber 127 so that the air flow flows in along the circumferential side wall surface.

From the suction duct 131 to the cyclone chamber 127
The airflow that has flowed into the inside becomes a rotating airflow and descends while rotating along the inner wall surface due to centrifugal force, and the dust descends on the airflow. The air current changes its direction near the bottom of the cyclone chamber 127 and rises as a rising air current while slightly rotating around the center of the cyclone chamber 127, and flows outward from the upper discharge duct 129. At this time, among the dust that has fallen near the bottom along with the rotating airflow, the heavy dust separates from the rotating airflow and falls to the bottom, but the small dust rises along with the rising airflow and moves outward from the discharge duct 129. Is discharged.

[0011]

By the way, in the conventional dust collecting apparatus, in the bag filter type dust collecting apparatus 101A, even when the outer surface of the plurality of filters 113 is coated with the pre-coating material, the welding fume or the heat cutting is performed. The fumes generated are very small, are easily stabbed on the filter surface, and have a problem that, since they are light, they adhere again even if they are wiped off by compressed air.

Further, in any of the inertial dust collecting type dust collecting apparatus and the cyclone type dust collecting apparatus 101B,
Because the fume to be collected is very small and light,
In the inertial dust collection type, the effect of inertia / collision is small, and in the cyclone type, it rises on the updraft.Therefore, there is a problem that the exhaust gas discharged from each dust collector still contains a lot of fumes. there were.

In the above-mentioned inertial dust collecting type and cyclone type dust collecting apparatus, since the airflow discharged from the discharge duct 129 contains small dust as described above, for example, FIG.
As shown in the figure, the small dust is removed by water spray injected from the nozzle 137 in the adjacent shower room 135 through the communication pipe 133, and the air is exhausted after being further cleaned by passing through the collision plate 139. Or a bag filter type dust collector 101A described above.
It is configured to be exhausted after passing through. as a result,
There is a problem that the whole system becomes large and expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a dust collection method which can efficiently collect dust with a simple mechanism. It is to provide a device.

[0015]

According to a first aspect of the present invention, there is provided a dust collecting method for sucking dust generated during machining of a work with a machine tool into a dust collecting device main body together with air. In a dust collector that collects the dust and discharges clean air, a magnetic field is generated in the conductor by energizing a conductor provided inside the dust collector main body,
The magnetic field adsorbs dust made of a magnetic material, and cuts off the adsorbed dust by interrupting the conduction of the conductive wire.

Therefore, fumes generated during, for example, thermal cutting are iron oxide and a magnetic substance, so that small and light dusts are generated due to a magnetic field generated by energizing a conductive wire.
The fume that is easily stabbed into the filter is easily absorbed around the conductor. The service life of the filter is improved,
Dust drops simply by making it FF, so disposal is easy and maintenance is improved.

According to a second aspect of the present invention, there is provided a dust collecting apparatus according to the first aspect, wherein the conductive wire extends around a wall surface of the dust collecting body.

Therefore, by extending the conducting wire along the wall surface of the main body of the dust collecting apparatus, a wide space for installing, for example, a filter is secured. Further, since dust generally turns along the wall surface in the airflow, the dust and fume are easily adsorbed by the conductive wire stretched along the wall surface, and the dust is collected efficiently.
In addition, since the conducting wire is stretched around the main body of the dust collecting device, a magnetic field is generated uniformly on the entire wall surface, so that the dust and fume absorbing effect is increased and the dust collecting effect is also improved.

According to a third aspect of the present invention, there is provided a dust collecting apparatus according to the present invention, wherein dust generated during machining of a workpiece by a machine tool is sucked into a dust collecting body together with air, and the dust is collected to discharge clean air. In a dust collecting device, a power generating device is provided with a conducting wire for generating a magnetic field inside the dust collecting device main body, one end and the other end of the conducting wire are connected by a connecting wire, and a current is supplied in the middle of the connecting wire. In addition to the above, a dust collection changeover switch for turning on / off the energization of the conducting wire is provided in series in the middle of the connecting wire.

Therefore, the operation is the same as that of the first aspect. For example, the fume generated during the thermal cutting is iron oxide and a magnetic material. The fume that is easily stabbed into the filter is easily absorbed around the conductor. The service life of the filter is improved, and dust is dropped simply by turning off the power supply to the conducting wire, so that disposal is easy and maintenance is improved.

According to a fourth aspect of the present invention, in the dust collecting apparatus according to the third aspect, the machine tool comprises a thermal cutting device, and the power generating device comprises a thermal cutting power source. The dust collection changeover switch is configured such that one end of the connection line is connected to a torch of a thermal cutting device and the other end of the connection line is connected to a work.

Therefore, since the thermal cutting apparatus is provided with a power supply for thermal cutting of a large current, it can be used without providing it separately. Further, the current between the torch and the work is turned ON / OFF at the time of the thermal cutting processing and at the end of the processing, so that it functions as a dust collection changeover switch. In addition, it is turned on during the thermal cutting, and is energized to the conductor when necessary, so that a large current of the power supply for thermal cutting flows. Therefore, a large magnetic field is generated in the conductor, and the attraction effect is increased.

According to a fifth aspect of the present invention, in the dust collecting apparatus according to the third or fourth aspect, the conductive wire is provided spirally along a wall surface of the main body of the dust collecting apparatus. It is characterized by the following.

Accordingly, the operation is similar to that of the second aspect, and by extending the conducting wire along the wall surface of the main body of the dust collecting apparatus, a wide space for installing a filter, for example, is secured. In addition, since dust generally turns along the wall surface in the airflow, the dust and fume are easily adsorbed by the conductive wire stretched along the wall surface, and the dust is efficiently collected. In addition, since the conducting wire is stretched around the main body of the dust collecting device, a magnetic field is generated uniformly on the entire wall surface, so that the dust and fume absorbing effect is increased and the dust collecting effect is also improved.

According to a sixth aspect of the present invention, there is provided a dust collector according to any one of the third to fifth aspects, wherein the inside of the dust collector body has a plurality of filters. It is characterized by comprising.

Therefore, the suction effect of the conducting wire and the dust collecting action of the bag filter complement each other, and the dust having a large or small mass is efficiently collected.

According to a seventh aspect of the present invention, there is provided a dust collector according to any one of the third to fifth aspects, wherein a discharge duct is provided at an upper portion and a lower portion inside the dust collector body. A stacking chamber is provided, and a suction duct is provided on the upper side surface.

Therefore, the suction effect of the conductive wire and the dust collecting action of the cyclone type dust collecting device complement each other, so that dust having a large or small mass can be collected efficiently.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dust collecting method and a dust collecting apparatus according to the present invention will be described below with reference to the drawings, taking a plasma processing machine as an example of a machine tool.

Referring to FIG. 1, in a plasma processing machine 1 according to the present embodiment, a work table 3 on which a work W is mounted is fixed on a floor surface.
Is provided with a dust collecting tank 5 for storing dross generated during hot cutting.

The work table 3 has an open upper part.
In this opening, plate-like bars 7 for placing the work W are arranged at appropriate intervals.

On the left side of the work table 3 in FIG. 1, an X-axis carrier for driving the carrier 9 of the plasma processing machine 1 in the front-rear direction (the X-axis direction, the direction perpendicular to the front and back of FIG. 1). A frame guide body 11 having a built-in driving device (not shown) is supported on a floor by a column 13 and is extended in the X-axis direction. On the right side of the work table 3 in FIG. 1, an X-axis guide rail 15 for guiding the carrier 9 to travel in the X-axis direction is supported on a floor 17 by a column 17 and is elongated in the X-axis direction. ing.

Accordingly, the carrier 9 is supported on the guide rail (not shown) of the frame guide body 11 on the left end side in FIG. 1 so as to be able to run freely, and via the wheels 21 of the pillar 19 fixed to the right end side in FIG. X axis guide rail 1
5 is provided so as to be able to travel freely, and is provided above the work table 3 so as to be movable and positioned in the X-axis direction by an X-axis driving device.

The carrier 9 is provided with, for example, a torch head 23 as a processing head so as to be movable in the left-right direction (the Y-axis direction, the left-right direction in FIG. 1) so as to be movable. A plasma torch 25 for injecting plasma as a torch for processing is provided so as to be vertically movable (Z-axis direction). Therefore, the plasma torch 25 can be moved and positioned on the work table 3 in the X-axis direction, the Y-axis direction, and the Z-axis direction.

At the tip of the plasma torch 25, a nozzle 27 for irradiating a plasma jet toward the work W is provided.

More specifically, the plasma processing machine 1 has a built-in power source generator, such as a DC welding power source and a high-frequency source, for generating a plasma jet. The gas is heated to a high temperature by the arc heat generated in the plasma torch 25 by the direct current welding power source or the high frequency generation source to form a plasma, and the plasma gas, that is, the plasma jet is jetted from the nozzle 27 and formed into a desired shape. Plasma processing such as cutting is performed.

A plurality of dust collection ducts 29 are arranged at appropriate intervals in the X-axis direction at a lower portion of the side wall of the dust collection tank 5. 31
Is connected to the suction port 33 of the. The dust collector 31 is provided with an air blower 35. When the air blower 35 is operated, air in the dust collecting tank 5 is sucked to generate an air current. The generated dust such as spatter and fumes is also sucked into the dust collecting device 31 by the airflow.

Next, the dust collector 31 showing the main part of the embodiment of the present invention will be described in detail. The dust collecting device 31 includes a mechanical filter type dust collecting device such as a bag filter type, an inertial dust collecting type, and a cyclone type.

Referring to FIG. 1, a bag filter type dust collecting device 31A has a dust collecting chamber 39 in which the inside of a dust collecting device 37 separates air and dust to collect dust at a lower portion, and a clean air at an upper portion. Exhaust chamber 41 for exhausting the gas to the outside is provided.

The dust collecting chamber 39 is provided with a suction port 33 for sucking air containing dust, and a plurality of filters 45 are provided in a communication port 43 between the dust collecting chamber 39 and the exhaust chamber 41. Equipped. A dust box 47 is disposed below the dust collecting chamber 39 for discarding dust that has fallen and accumulated.

At an upper portion of the exhaust chamber 41, an exhaust port 35 for exhausting air and an exhaust fan 35 including an exhaust fan 53 rotated by a motor 51 are provided. Further, a pulsed air valve unit 55 (air injection device) for periodically and instantaneously injecting compressed air into the plurality of filters 45 is provided in the exhaust chamber 41.

In the dust collecting chamber 39, a conducting wire 57 that generates a magnetic field when energized is spirally wound along the inner wall surface, and one end of the conducting wire 57 is connected to, for example, a plasma power source 59 as a power generating device. The plasma torch 25 is electrically connected to the plasma power source 59 by a connection line 60. On the other hand, the other end of the conducting wire 57 is connected to the work W placed on the bar 7
Are electrically connected to each other.

A dust collection switch is formed between the plasma torch 25 and the work W, which is turned on (ON) during the plasma processing and is turned off (OFF) when the plasma processing is completed.

The conducting wire 57 for generating a magnetic field is connected to the dust collecting chamber 39.
Since the inside of the dust collecting chamber 39 has an effect of adsorbing dust, the installation state of the conducting wire 57 provided inside the dust collecting chamber 39 is not particularly limited.
It is desirable to stretch the wire 7 along the wall surface of the dust collector main body 37 for the following reasons.

(1) For example, a wide space for installing the filter 45 can be secured. (2) Generally, dust is swirled along the wall surface of the dust collecting chamber 39 in the airflow, so that the dust and fume are easily adsorbed by the conducting wire 57 stretched along the wall surface and the dust is collected efficiently. Will be (3) Conductor wire 5
Since the magnetic field 7 is stretched around the dust collecting chamber 39, a magnetic field is generated uniformly on the entire wall surface, so that the dust and fume adsorption effect is increased and the dust collecting effect is also improved.

With the above configuration, when the exhaust fan 53 rotates, a negative pressure is generated inside the dust collector main body 37, so that air containing dust is sucked from the work table 3 of the plasma processing machine 1 and the dust collecting duct 29 is After that, the air flows from the suction port 33 into the dust collection chamber 39, and the air in the dust collection chamber 39 passes through the plurality of filters 45 and flows into the exhaust chamber 41. At this time, dust adheres to the outer surfaces of the plurality of filters 45 and is separated from air. The clean air in the exhaust chamber 41 is discharged from the exhaust port 49 to the outside.

At this time, the plasma torch 25 and the work W
The work W side is normally (+) pole and the plasma torch 25 side is conducting (ON) as a (−) pole during plasma processing, and is stretched around the dust collection chamber 39 during plasma processing. A current flows through the conducting wire 57.

When power is supplied to the conductor 57, a magnetic field is generated around the conductor 57 by electromagnetic action. Since the fume is iron oxide and is a magnetic material having a property of being attracted by a magnetic force, the fume is attracted around the conducting wire 57 by the magnetic field. In addition, the fumes adhere to each other, so that the fume particles also become large.

Although the current flowing during the plasma cutting depends on the capacity of the plasma power source 59, the current is several tens of amperes to several tens of amperes.
00 amps. The load on the filter 45 is particularly large when a large amount of dust or fume is generated when cutting a thick workpiece W when cutting with a large current.
However, when a large cutting current flows during plasma cutting, a large magnetic field is generated around the conducting wire 57, and the effect of adsorbing fumes is increased.

In the case of the plasma processing machine 1, the cutting current is turned off when moving to the next product, so that conduction between the plasma torch 25 as a dust collection changeover switch and the work W is cut off. Therefore, the conduction of the conducting wire 57 is turned off.
Therefore, the fume adsorbed by the conductive wire 57 falls downward. At this time, when compressed air is instantaneously injected into the plurality of filters 45 by the pulsed air valve unit 55, dust adhering to the outer surface of the filter 45 is removed by the compressed air and, at the same time, adsorbed on the conducting wire 57. The fumes that have been dropped also become easier to fall. Dust box 47
The dust accumulated in the garbage accumulates to some extent before being discharged.

As described above, since the plasma cutting itself uses a large current, it is necessary to newly add special devices and circuits such as a power supply device, a dust collection switch, and a control circuit. Instead, various devices of the plasma processing machine 1 can be used. Therefore, the efficiency of dust collection and maintenance can be improved.

The current is turned off by the dust collection switch.
At times, mechanical vibration (shock) is generated in the dust collecting device 31A, and the dust-off effect may be improved.

Referring to FIG. 2 and FIG. 3, the cyclone type dust collector 31B has a cyclone chamber 63 for separating air and dust at an upper part of a dust collector main body 37, and a cyclone dust collector which drops to the bottom of the cyclone chamber 63 at a lower part. An accumulation chamber 65 for storing and discharging accumulated dust is provided. An openable and closable partition plate 67 is provided between the cyclone chamber 63 and the accumulation chamber 65.

The cyclone chamber 63 has a substantially circular cross section, and a discharge duct 69 projecting inward is provided substantially at the center of the upper wall surface of the cyclone chamber 63. Also,
Above the side wall surface of the cyclone chamber 63, there is provided a suction duct 71 projecting outward from the side wall surface so that the air flow flows in along the circumferential side wall surface. The axial direction of the suction duct 71 is shown in FIG. As shown in the figure, the cyclone chamber 63 is located in the tangential direction of the inner wall surface forming a circular cross section.

In the cyclone chamber 63, similarly to the above-described bag filter type dust collector 31A, a conducting wire 57 that generates a magnetic field when energized is spirally wound along the inner wall surface. One end of the conducting wire 57 is electrically connected to, for example, a plasma power source 59 as a power source by a connection line 60, and the plasma torch 25 is electrically connected to the plasma power source 59 by a connection line 60. On the other hand, the other end of the conducting wire 57 is connected to the work W placed on the bar 7
0 is electrically connected. It is desirable to provide the conducting wire 57 also around the discharge duct 69 as shown in FIG. 2 since dust can be collected efficiently.

According to the above configuration, the axial direction of the suction duct 71 is located tangentially to the inner wall surface of the cyclone chamber 63 having a circular cross section, so that the airflow flowing from the suction duct 71 into the cyclone chamber 63 is a rotating airflow. As a result, the dust descends while rotating along the inner wall surface due to centrifugal force, and the dust descends on the air flow. At this time, similarly to the above-described bag filter type dust collecting device 31A, the conductive wire 57 in the cyclone chamber 63 is energized during the plasma processing by a function as a dust collecting switch between the plasma torch 25 and the work W, Since a magnetic field is generated around the conducting wire 57, even if the dust made of a magnetic material such as fume is minute, the dust is attracted around the conducting wire 57 by the above-described magnetic field.

When the air current reaches near the bottom of the cyclone chamber 63, the air flow reverses and changes direction to become an ascending air current, while rising slightly while rotating the center of the cyclone chamber 63, and flows outward from the upper discharge duct 69. At this time, among the dust that has fallen near the bottom part along with the rotating airflow, the dust having a large mass separates from the rotating airflow and falls to the bottom part. The small dust tends to rise on the ascending airflow and be discharged outward from the discharge duct 69, but as described above, the dust made of a magnetic material such as fume is already adsorbed by the magnetic field of the conducting wire 57, From the discharge duct 69, cleaner air is discharged.

After the plasma processing is completed, the conduction of the conducting wire 57 is
Since the fumes become FF, the fumes adsorbed by the conductive wire 57 fall to the lower bottom part, and the partition plate 67 is opened later, and the stacking chamber 6 is opened.
5 are integrated.

The dust collector shown in FIG. 4 is similar to the bag filter type dust collector 31A shown in FIG. 1, and is a general power source for supplying a current to the conductor 57. 73 is specially provided and the conduction of the conducting wire 57 is turned ON /
A general changeover switch 75 can be used as the dust collection changeover switch to be turned off, and the changeover switch 75 can be adjusted in time by a timer operated by the operation of the machine tool. It is widely applied to various machine tools without being limited to the thermal cutting machine.

The dust collector shown in FIG. 5 is the same as the cyclone dust collector 31B shown in FIG.
A general power supply 73 is specially provided as a power supply for supplying a current to the conducting wire 57, and a general changeover switch 75 can also be used as a dust collection changeover switch. The time can be adjusted by an operating timer, and the present invention is widely applied to various machine tools without being limited to the above-mentioned thermal cutting machine such as the plasma machining machine.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other modes by making appropriate changes. In this embodiment, a plasma processing machine has been described as an example of a machine tool, but a thermal cutting machine such as a laser machine, a machine tool such as a punch press, and other machine tools may be used.

In the present embodiment, a bag filter type dust collector or a cyclone type dust collector has been described as an example of a dust collector, but an inertial dust type dust collector and other dust collectors may be used. Absent.

In the inertial dust collecting type dust collecting apparatus, an ultra-thin filter laminated in a multilayer structure is provided in the main body of the dust collecting apparatus, and when air containing dust passes through the ultra-thin plate filter, the mass of the air is reduced. The large dust collides with the wall surface of the filter and falls downward, and the small dust passes through the gap of the ultra-thin filter and is discharged to the outside.

Therefore, in the inertial dust collecting type and cyclone type dust collecting apparatus of the present invention, even small dust can be easily collected. Since it is not necessary to exhaust after passing through the apparatus, the cost is low.

[0065]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, the magnetic field generated by energizing the conductive wire causes the fume generated during the thermal cutting process. Such a small and light iron oxide and magnetic substance, which is easy to stick to the filter, can easily adsorb the dust around the conducting wire, so that the life of the filter can be improved. In addition, dust is dropped only by turning off the power supply to the conductive wire, so that disposal processing is easy and maintenance can be improved.

According to the second aspect of the present invention, since the conductive wire is stretched along the wall surface of the main body of the dust collector, a wide space for installing a filter can be secured, for example.
Therefore, the surface area of the filter can be increased, and the dust collecting effect can be improved.

In addition, since dust generally turns along the wall surface in the air flow, dust and fume can be easily adsorbed by the conductive wire stretched along the wall surface, and dust can be collected efficiently. . In addition, since the conducting wire is stretched around the dust collector body, a magnetic field can be generated evenly on the entire wall surface, so that the dust and fume adsorption effect can be increased,
The dust collecting effect can also be improved.

According to the third aspect of the present invention, the effect is the same as that of the first aspect, wherein the magnetic field is generated by energizing the conducting wire, and the magnetic field is an iron oxide such as fume generated at the time of thermal cutting. Dust, which is small and light, and easily sticks to the filter, can be easily absorbed around the conducting wire, so that the life of the filter can be improved. In addition, dust is dropped only by turning off the power supply to the conductive wire, so that disposal processing is easy and maintenance can be improved.

According to the fourth aspect of the present invention, the thermal cutting device is provided with a power supply for thermal cutting with a large current.
It can be used without separate installation. Also, the current is turned ON / OFF between the torch and the workpiece at the time of thermal cutting and at the end of processing.
So it can be used as a dust collection switch,
It is not necessary to provide separately. In addition, this dust collection changeover switch can be turned on at the time of thermal cutting and can be energized to the conductor when necessary,
Since a large current of the power supply for thermal cutting can be passed, a large magnetic field can be generated in the conductor, and the attraction force can be increased.

According to the fifth aspect of the present invention, the effect is the same as that of the second aspect, and since the conducting wire is stretched along the wall surface of the main body of the dust collecting apparatus, for example, a wide space for installing a filter. Therefore, the surface area of the filter can be increased, so that the dust collecting effect can be improved.

In addition, since dust generally turns along the wall surface in the air flow, the dust and fume can be easily absorbed by the conductive wire stretched along the wall surface, and the dust can be collected efficiently. . In addition, since the conducting wire is stretched around the dust collector body, a magnetic field can be generated evenly on the entire wall surface, so that the dust and fume adsorption effect can be increased,
The dust collecting effect can also be improved.

According to the sixth aspect of the present invention, dust having a large or small mass can be efficiently collected by the suction effect of the conductive wire and the dust collecting effect of the bag filter.

According to the seventh aspect of the invention, dust having a large or small mass can be efficiently collected by the effect of attracting the conductive wire and the effect of collecting the cyclone dust.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an overall front view including a cross section of a bag filter type dust collector provided in a plasma processing machine 1. FIG.

FIG. 2, showing an embodiment of the present invention, is a schematic explanatory view including a cross section of a cyclone type dust collecting apparatus.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 shows another embodiment of the present invention, and is a schematic explanatory view including a cross section of a bag filter type dust collector.

FIG. 5 shows another embodiment of the present invention, and is a schematic explanatory view including a cross section of a cyclone type dust collector.

FIG. 6 is a schematic explanatory view including a cross section of a conventional bag filter type dust collector.

FIG. 7 is a schematic explanatory view including a cross section of a conventional dust collector provided with a cyclone type, a shower room, and a collision plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma processing machine (thermal cutting apparatus) 3 Work table 5 Dust collecting tank 25 Plasma torch (torch) 29 Dust collecting duct 31 Dust collecting device 31A Bag filter type dust collecting device 31B Cyclone type dust collecting device 37 Dust collecting device main body 39 Dust collection chamber 45 Filter 57 Conductor 59 Plasma power supply (power generation device) 60 Connection line 63 Cyclone chamber 75 Changeover switch (Dust collection changeover switch)

Claims (7)

[Claims] 1. A dust collector for sucking dust generated during processing of a workpiece by a machine tool together with air into a dust collector main body, collecting the dust, and discharging clean air. By energizing a conducting wire provided inside the main body, a magnetic field is generated in the conducting wire, the magnetic field attracts dust made of a magnetic material, and the energizing of the conducting wire is cut off to drop the attracted dust. Characterized dust collection method. 2. The dust collecting method according to claim 1, wherein the conductive wire is stretched along a wall surface of the main body of the dust collecting device. 3. A dust collector which sucks dust generated during machining of a workpiece by a machine tool together with air into a dust collector body, collects the dust, and discharges clean air to generate a magnetic field. A conductor is provided inside the dust collector body,
One end and the other end of the conducting wire are connected by a connecting wire, and a power supply device for supplying a current is provided in the middle of the connecting wire.
A dust collector comprising a dust collection switch for N / OFF. 4. The machine tool comprises a thermal cutting device, the power generator comprises a thermal cutting power source, and the dust collection switch connects one end of the connection line to a torch of the thermal cutting device. 4. The dust collector according to claim 3, wherein the other end of the connection line is connected to a work. 5. The dust collector according to claim 3, wherein the conductive wire is provided spirally along a wall surface of the dust collector main body. 6. The dust collector according to claim 3, wherein the inside of the dust collector main body is provided with a bag filter having a plurality of filters. 7. The dust collecting apparatus according to claim 3, wherein a discharge duct and an accumulation chamber are provided in upper and lower portions inside the main body of the dust collector, and a suction duct is provided in a side surface of the upper portion.
The dust collector according to any one of the fifth to fifth aspects.