JP2009006221A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector suited to collect fume produced in arc welding work and dry dust produced in cutting or grinding work of a metal or plastic. <P>SOLUTION: In the dust collector composed of a collection unit collecting fume or dust produced by welding and a Roots blower discharging air having passed through the collection unit to the outside, the collection unit 10 has a rotary filter 31 using a filter material made of nonwoven fabric with given roughness attached to the rotary shaft 26 of a motor device 23, to discharge air filtered by the rotary filter to the suction side of the Roots blower, and to supply compressed air of an amount of air of 30-35% of suction air volume of the collection unit by an air supply means to an air blow nozzle 51 disposed in a casing of the collection unit, to clean the filter by always blowing compressed air to the outer periphery of the rotary filter 31 from the air blow nozzle 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dust collecting apparatus for dry dust having a relatively small amount of oil and moisture generated during cutting or polishing of fume, metal or plastic generated during arc welding work.

  As for conventional dust collectors, those having various structures such as a filter system, a flushing system with a collision plate, and an electric dust collection system are known. For example, Patent Document 1 discloses a suction drive unit that sucks dust by a suction force of a fan that is driven and rotated by a motor, a silencer unit that is vertically connected to the suction drive unit, and an upper portion that is orthogonal to the silencer unit. Disclosed is a dust collector that has a main body base for fixing the suction drive unit and a dust collection base on which the dust collection bag is placed separately provided with a cyclone part to which the upper bag is attached and a dust collection bag is attached to the lower part. Has been. This dust collector has the convenience that the dust collection bag can be carried out while being placed on the dust collection table, but the height of the device increases due to the structure in which the upper bag and the dust collection bag are arranged vertically, There may be restrictions on the place of use.

  In a general filter type dust collector, a filter having a mesh of 0.1 μm to 0.5 μm is used, but clogging is likely to occur. Therefore, a method has been developed for removing dust adhering to the collecting surface by injecting pressure air onto the collecting surface of the filter.

Patent Document 2 describes “a filter cleaning device in a fume recovery machine”. This device relates to the applicant of the present application. While rotating a rotary nozzle disposed inside the filter by air generated by a reverse rotation operation by a Roots-type blower, pressure air is applied to the back side of the collection surface of the filter. It is set as the structure (so-called "backwashing") which wash | cleans a filter by ejecting. However, depending on the type of fumes, fumes may adhere to the periphery of the check valve provided at the discharge port that discharges the air in the recovery machine to the atmosphere side during backwashing. The inconvenience of erupting to the person side occurred.
JP-A-11-333232 Japanese Patent No. 3316476

  An object of the present invention is to provide a dust collecting apparatus suitable for collecting dust having dry properties generated during cutting or polishing of fume, metal or plastic generated during arc welding work.

In order to achieve the above object, the invention described in claim 1 includes a collecting unit that sucks and collects fumes and dusts generated by welding together with the surrounding air, and the inside of the case of the collecting unit is negative. In a dust collector composed of a Roots-type blower that discharges air that has passed through the unit to the outside,
The collection unit is a rotation in which a filter material using a non-woven fabric of a predetermined roughness is attached to the outer periphery of a cylindrical body having a large number of air passage openings on a rotation shaft of a motor device arranged so as to face the case. A rotary filter is provided, the rotary filter is rotatably provided at a predetermined rotational speed by a motor device, and the air filtered by the rotary filter is provided to be discharged to the suction side of the roots blower, and the case An air blow nozzle disposed in the air blow nozzle is provided so as to supply pressure air having an air amount of 30 to 35% with respect to the intake air amount of the collection unit by an air supply means, and the outer periphery of the rotary filter from the air blow nozzle The filter is cleaned by always blowing pressure air onto the surface.

In order to achieve the same object, the invention described in claim 2 is the dust collector according to claim 1,
When the fumes and dusts contain moisture and oil, the intake air amount of the dust collecting unit is about 50 to 60%, and the air blow air amount is also reduced to about 50% of the intake air amount. It is configured as described above.

(Invention of Claim 1)
This dust collector has a compact combination of a collection unit using a rotary filter and a Roots-type blower, and is a dry unit that is generated when cutting or polishing fume, metal, or plastic that occurs during arc welding. It is possible to efficiently collect the dust of properties. Furthermore, by always blowing pressure air from the air blow nozzle to the rotary filter, the filter can be maintained in a good state. In the conventional dust collector, the collection operation has to be interrupted in order to obtain air for air blowing by rotating the Roots-type blower in the reverse direction. On the other hand, in the device of the present invention, since the constantly rotating filter is configured to air blow, the collection operation can be continuously performed. Moreover, since it is not the structure which cleans a rotary filter using the pressure air by backwashing, the problem that the fume adhering in piping spouts to an operator side does not arise.

(Invention of Claim 2)
In this dust collector, the intake air amount of the dust collection unit is about 50 to 60%, and the air blow air amount is also reduced to about 50% of the intake air amount, so that fume and dust containing moisture and oil are included. Can be efficiently collected.

  The best mode of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a collecting unit of a dust collecting apparatus according to a first embodiment of the present invention, FIG. 2 is a longitudinal front view of the collecting unit, and FIG. 3 is a schematic view of the dust collecting apparatus of the first embodiment. FIG. 4 is an explanatory diagram when the dust collector of the first embodiment is used for collecting dry dust, and FIG. 5 is a diagram of the dust collector of the second embodiment according to the present invention. FIG.

(Example 1)
The dust collector A of the first embodiment according to the present invention sucks fume generated during arc welding work, dry dust or the like generated during cutting or polishing of metal or plastic together with ambient air. And a Roots type blower (not shown) that discharges air that has passed through the unit 10 to the outside while making the inside of the case 11 of the collection unit 10 have a negative pressure. .

  In FIG. 1, the case 11 of the collection unit 10 includes a cylindrical case body 12, an end cover 15 having an outlet 16, and a housing 19. The end cover 15 is attached to one open end 12 a of the case body 12. The housing 19 is attached to the other open end 12 b of the case body 12. A suction port 13 for connecting the suction pipe 1 and a dust discharge pipe 14 are provided in the body portion of the case body 12.

  In the center hole of the housing 19, an annular seal 20 and a ball bearing 21 are mounted in order on the inner side of the case main body 12 side, and a rotary shaft 26 serving as an output shaft of the motor device 23 described later is attached to the annular seal 20 and the ball bearing 21. The middle part is inserted.

  The casing 24 of the motor device 23 is attached to the small diameter flange 19 b of the housing 19. The rotating shaft 26 of the motor device 23 is rotatably supported by a ball bearing 25 built in the casing 24 and the ball bearing 21, and is arranged so that the tip end portion 26 a faces the case 11. .

  A rotary filter 31 is detachably provided on the rotary shaft 26. As shown in FIG. 2, the filter 31 has a cylindrical filter member 34 mounted on a guide member 33 attached to the outer periphery of a cylinder 32 having a large number of air passages 32a. Both ends of the member 32, the guide member 33, and the filter material 34 are provided so as to be fixed to the rotary shaft 26 while being sandwiched by face plates 38 and 40.

In the filter material 34, a large number of ridges 35 are continuously formed in a zigzag shape from a nonwoven fabric having a predetermined roughness. The filter material 34 has an outer diameter of about 200 to 500 mm and a length of about 200 to 500 mm. Regarding the roughness of the filter material 34, dry fume generated during arc welding work: mesh 0.1 to 0.3 μm, dry dust generated during metal or plastic cutting and polishing processes: About 1 to 3 μm.

  The rotary filter 31 is provided to be driven and rotated by the motor device 23 at 150 to 300 revolutions per minute.

  The face plate 40 is fixed to the rotary shaft 26 by inserting a shaft cylinder 41 formed on the back side of the center portion into the rotary shaft 26 and tightening a bolt 44. Around the shaft cylinder 41, four holes 42 are provided as shown in FIG. The cylindrical portion 43 formed on the front side of the center portion of the face plate 40 is provided in a substantially contact manner in the large diameter hole 15 a of the end cover 15. A plurality of annular grooves 17 are formed in the large diameter hole 15 a, and a labyrinth seal is formed by the annular grooves 17 and the outer peripheral surface of the cylindrical portion 43.

  The dust discharge pipe 14 is detachably provided with a collection tank (not shown) for collecting the dust removed from the rotary filter 31.

  An air blow nozzle 51 is disposed on the outer upper side of the rotary filter 31. The air blow nozzle 51 is provided with several outlets 52, and a supply hose 53 connected to an air supply means (not shown) is connected to the pressure air supply port 51a.

  The air supply means uses a Roots-type blower used for the collection unit 10 and a small Roots-type blower provided separately or a pressure air used in a factory. However, the air amount of the air supply means is about 30 to 35% with respect to the intake air amount of the collection unit 10.

A suction side of a Roots-type blower (not shown) is connected to the outlet 16 of the collection unit 10 via a suction pipe 56.
The dust collector A of 1st Embodiment which concerns on this invention is comprised by the above.

Next, the operation of the dust collector A according to the first embodiment of the present invention will be described.
(1) For example, as shown in FIG. 3, when arc welding is performed on a workpiece 62 set on a gantry 61, it is assumed that dry fume h is generated.
(2) In the dust collector A, the collection unit 10 and the suction pipe 55 are held at a negative pressure by the operation of the Roots-type blower, and the dry fume h generated in (1) by the negative pressure action is separated from the ambient air. Together, it flows into the collection unit 10 through the suction pipe 55.
(3) In the collection unit 10, the rotary filter 31 is rotationally controlled by the motor device 23 within a range of 150 to 300 revolutions per minute. Accordingly, the dry fume h contained in the air sucked into the case 11 is separated and removed by the rotary filter 31.
(4) The dry fume h separated and removed by the rotary filter 31 is accumulated in the recovery tank from the dust discharge pipe 14.
(5) The air purified by the collection unit 10 is discharged to the outside through the suction pipe 56 and the roots type blower.

  On the other hand, pressure air is constantly ejected from the outlet 52 of the air blow nozzle 51, and the rotary filter 31 is always cleaned by the pressure air.

  FIG. 4 shows a case where the dust collector A according to the first embodiment of the present invention is applied to collecting dust having dry properties generated in the machining chamber 70 of the machining center MC.

  As for the machining center MC, a column 66 provided on a bed 65 so as to be movable in the front-rear direction is provided with a spindle head 67 whose position is automatically controlled in the vertical and horizontal directions, and a spindle is drilled on a spindle that is freely supported by the spindle head 67. A cutting tool 68 such as is mounted. A workpiece w is set on the table 69 placed on the bed 65. An opening / closing door 71 is provided in the processing chamber 70 in which the inside is substantially sealed. Reference numeral 72 denotes a suction pipe having a hood 73 for sucking dust in the processing chamber 70.

  In addition, about the effect | action of the dust collector A in this case, since it applies to the collection effect | action of the dry fume which generate | occur | produces at the time of the arc welding operation mentioned above, description is abbreviate | omitted.

Embodiment 2
The dust collector B of 2nd Embodiment which concerns on this invention is the roots type blower 130 which makes the suction | inhalation side of the collection unit 82 a negative pressure state, and discharges the air which passed the collection unit to the exterior. It is suitable for collecting dust with dry properties generated during cutting or polishing of fumes, metals or plastics generated during arc welding operations.

  In FIG. 5, the casing 83 of the collection unit 82 has an exhaust port 84 formed below, a hole 85 is formed on the side, and a bottom 83 a is fixed to the gantry 81. A suction port 87 and a dust discharge port 88 are provided in the body portion of the case 86 that houses the rotary filter. The case 86 is fixed to the side portion of the casing 83 with the right open end 86 a communicating with the hole 85 of the casing 83. An end cover 89 is attached to the left open end 86 b of the case 86.

  A motor device 95 is attached to a mounting seat 83 b of the casing 83. An annular seal 91 and a ball bearing 92 are sequentially mounted in a stepped hole 83c formed at the center of the mounting seat 83b. An output shaft 98 of the motor device 95 is rotatably supported by a ball bearing 97 built in the rear portion of the motor body 96 and the ball bearing 92.

  A boss 102a of a filter holder 102 provided with a suction port 103 is inserted into the front end portion of the output shaft 98 arranged so as to face the casing 83, and the nut 104 is screwed to fix the holder 102. is doing. In the body of the filter holder 102, a plurality of through holes 105 are formed and an annular groove 106 for sealing is formed. A flange 111 a of the cylindrical body 111 of the rotary filter 110 is fastened and fixed to the suction port 103 of the filter holder 102 by a bolt 109.

  In the rotary filter 110, a large number of ridges are continuously formed in a zigzag shape on the outer periphery of a cylindrical body 111 in which a large number of air passage holes 112 are formed via a wire mesh filter reinforcing material (not shown). A filter material 115 is attached. Face plates 116 and 117 are applied to both ends of the filter material 115, respectively, and are fixed by an adhesive. Reference numeral 118 denotes a presser plate that is applied to one face plate 117 and is fixed to the cylindrical body 111 by a bolt 119.

  About the filter material 115 shown in FIG. 5, the same thing as the filter material 34 of the dust collector A of 1st Embodiment is used.

  The rotary filter 110 is provided to be driven and rotated at 150 to 300 revolutions per minute by the motor device 95.

  Reference numeral 121 denotes an air blow nozzle arranged on the outer upper side of the rotary filter 110. The air blow nozzle 121 is provided with several outlets 122, and a supply hose 123 connected to the air supply means is connected to the pressure air supply port 121a.

  The air supply means is a small Roots-type blower 125 disposed on the gantry 81 separately from the Roots-type blower 130 used for the collection unit 82. In addition, it may replace with the 2nd roots type blower 125, and you may use it, reducing the pressure air used in a factory. However, the air amount of the air supply means is about 30 to 35% with respect to the intake air amount of the collection unit 82, and the pressure is about 20 to 30 kPa.

The dust discharge port 88 is detachably provided with a tank 127 having a caster for collecting dust and the like removed from the collection unit 82. In addition, the suction side of a three-leaf roots blower 130 is connected to the exhaust port 84 of the collection unit 82. In this embodiment, the air intake portion 131 of the Roots-type blower 130 is provided integrally with the casing 83, but is not limited thereto. Reference numeral 132 denotes a silencer connected to the exhaust side of the roots type blower 130.
The dust collector B of 2nd Embodiment which concerns on this invention is comprised by the above.

  In addition, about the effect | action at the time of applying the dust collector B of 2nd Embodiment to collection of the dry fume etc. which generate | occur | produce at the time of arc welding, since it applies to the effect | action of the dust collector A of 1st Embodiment mentioned above, description Is omitted.

  When the dust to be collected contains moisture or oil, the amount of air sucked by the dust collector A of the first embodiment and the dust collector B of the second embodiment is about the same as that of dry dust. 50-60%. Further, it is preferable that the air amount for air blow is set to about 50% of the reduced amount of intake air.

(Experiment 1)
About the dust collector A of 1st Embodiment which concerns on this invention, the collection performance which collects the dry fume which generate | occur | produces at the time of arc welding in the case shown in FIG. 3, and the roots type blower from the inlet 13 of the collection unit 10 Experiments were conducted on the pressure loss (pressure loss) between the suction ports under the following conditions. The result is shown in the graph of FIG.

(Dust collector A)
Collection unit Rotary filter: Filter material Chemical synthetic nonwoven mesh 0.3μm
Rotation speed: 300rpm
Motor device output: 0.4 kW
Roots-type blower: 65 mm diameter x 1.5 kW output
Rotation speed: 2000rpm
Suction air volume: 2 m ³ / min Roots blower for air blow: caliber 32 mm x output 0.75 kW
Rotational speed: 2600 rpm
Discharged air amount: 0.65 m ³ / min. Dry fume concentration on the suction side of the collection unit 10: about 10 mg / m ³

As a result of the experiment, the fume concentration at the exhaust port of the Roots-type blower was about 0.02 mg / m ³ , and good results were obtained. The pressure loss was about -5 kPa.

(Experiment 2)
About the dust collector A of 1st Embodiment which concerns on this invention, it experimented on the following conditions about the collection performance which collects the dry dust generated in the processing chamber 70 in the case of FIG. 4, and a pressure loss. It was. The result is shown in the graph of FIG.
Dust concentration on the suction side of the collection unit 10: 4 mg / m ³

As a result of the experiment, the dust concentration at the exhaust port of the Roots type blower was about 0.02 mg / m ³ , and good results were obtained. The pressure loss was about -4 kPa.

Explanatory drawing of the collection unit of the dust collector of 1st Embodiment which concerns on this invention. Longitudinal front view of collection unit Explanatory drawing when the dust collector of the first embodiment is used for collecting dry fume Explanatory drawing when using the dust collector of the first embodiment for collecting dry dust Schematic diagram of the dust collector of the second embodiment according to the present invention Graph showing experimental results of collection performance and pressure loss in the dust collector of the present invention

Explanation of symbols

A ... Dust collector 10 ... Carrying unit 11 ... Case 23 ... Motor device 26 ... Rotary shaft 31 ... Rotary filter 34 ... Filter material 51 ... Air blow nozzle B ... Dust collector 82 ... Collection unit 86 ... Case 95 ... Motor device 110 ... Rotary filter 121- of the second embodiment of the present invention ..Air blow nozzle 125 Roots type blower (air supply means)
130 ... Roots blower

Claims (2)

A collection unit that sucks and collects fumes and dust generated by welding together with the surrounding air, and a root that discharges the air that has passed through the unit to negative pressure inside the case of the collection unit In a dust collector composed of a blower
The collection unit is a rotation in which a filter material using a non-woven fabric of a predetermined roughness is attached to the outer periphery of a cylindrical body having a large number of air passage openings on a rotation shaft of a motor device arranged so as to face the case. A rotary filter is attached, the rotary filter is provided so as to be rotatable at a predetermined rotational speed by a motor device, and the air filtered by the rotary filter is provided to be discharged to the suction side of the Roots blower. The air blow nozzle disposed in the air blow nozzle is provided so as to supply pressure air having an air amount of 30 to 35% with respect to the intake air amount of the collection unit by an air supply means, and the outer peripheral surface of the rotary filter from the air blow nozzle A dust collector, wherein the filter is cleaned by always blowing pressure air onto the filter.   When the fumes and dusts contain moisture and oil, the intake air amount of the dust collecting unit is about 50 to 60%, and the air blow air amount is also reduced to about 50% of the intake air amount. The dust collector according to claim 1, which is configured as described above.

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