JP4897646B2 - Dust collector - Google Patents

Description

  The present invention relates to a dust collector for collecting viscous fumes generated when arc welding is performed on oil-coated or painted welding materials.

  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. The filter system is simple and the equipment cost is low for collecting fumes generated during arc welding work. However, research and experiments have confirmed that fume granulates immediately when there is a turbulent flow or collision phenomenon, and causes a phenomenon that adheres to the back side (downstream side) of a valve or the like provided in a suction pipe that sucks air containing fume ing.

  In a general filter type dust collector, a filter having a mesh of 0.1 μm to 0.5 μm is used. However, a viscous fume generated from oiled or painted welding material is likely to clog the filter. . Therefore, a method has been developed for removing fumes and dust adhering to the collecting surface by injecting pressure air onto the collecting surface of the filter.

The “fume dust collecting machine” described in Patent Document 1 performs an operation of switching the rotation direction of the drive motor of the roots type blower when fume dust adheres to the filter and clogs are generated. In this structure, the filter media is vibrated by the pressure fluctuation action generated in the filter to promote the separation of fume dust. However, the recovery machine does not have the function of granulating viscous fumes generated from oiled or painted welding materials and separating and removing them from the sucked air. was there.
JP 11-276832 A

  An object of the present invention is to provide a dust collecting apparatus suitable for collecting viscous fumes generated when arc welding is performed on an oil-coated or painted welding material.

In order to achieve the above object, the invention described in claim 1 is directed to a collecting unit that sucks and collects viscous fumes generated by arc welding together with surrounding air, and an inside of the case of the collecting unit. In a dust collector composed of a Roots-type blower that discharges air that has passed through the unit to a negative pressure,
The collection unit fixes a filter holder having a suction port on a front surface to a rotation shaft of a motor device arranged so as to face the case, and fixes a rotary filter cylinder to the front surface of the filter holder. A filter material in which a large number of wrinkles are continuously formed in a zigzag manner by a non-woven fabric having a predetermined roughness is attached to the outer peripheral portion of the cylinder having a large number of air passage openings, and the center of the tip of the cylinder is Is provided with a disk-shaped wire brush, the rotary filter and the wire brush are rotated at a predetermined rotational speed by a motor device, and the fume removed by the rotary filter is provided in a discharge pipe provided in the case. When a tank for collecting dust is detachably provided, and the viscous fume flowing into the case is granulated by the striking action by the rotation of the wire brush. The rotary filter separates and removes fumes and exhausts the filtered air to the suction side of the Roots-type blower. Pressure air is supplied from the air blow nozzle disposed in the case to the outer peripheral surface of the rotary filter. It is characterized by having comprised so that the filter can be cleaned by spraying.

  This dust collector uses a collection unit that uses a rotary filter and a wire brush, and rotates the wire brush to remove the viscous fumes that occur when arc welding welded or painted welding materials. It is possible to efficiently carry out separation and removal by a rotary filter by granulating by a striking action that can be called a hitting operation by. Furthermore, by forcibly removing fumes adhering to the rotary filter by the air blow nozzle, a stable collection function can be maintained for a long time.

  The best mode of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a dust collector according to the present invention, FIG. 2 is a longitudinal sectional view of a main part of a collection unit, FIG. 3 is a perspective view of a wire brush, and FIG. 4 is arc welding the dust collector according to the present invention. It is explanatory drawing in the case of using for work.

  The dust collector C according to the present invention includes a collection unit 10 that sucks and collects viscous fumes that are generated when arc welding an oiled or painted welding material together with the surrounding air; The suction side of the collection unit 10 is made into a negative pressure state, and is composed of a Roots type blower 67 that discharges air that has passed through the collection unit to the outside.

  In FIG. 1, the casing 12 of the collection unit 10 has an exhaust port 13 formed below, a hole 14 is formed on one side, and a bottom 12 a is fixed to the gantry 11. A horizontally long cylindrical case 16 that accommodates the rotary filter is fixed to the casing 12 in a state in which the right open end 16 a is in communication with the hole 14 of the casing 12. A fume dust discharge pipe 18 is integrally provided at the bottom of the case 16. An end cover 20 having a suction port 21 is attached to the left open end 16 b of the case 16.

  A motor device 25 is attached to a mounting seat 12 b on the other side of the casing 12. An annular seal 22 and a ball bearing 23 are sequentially mounted in a stepped hole formed at the center of the mounting seat 12b. The output shaft 28 of the motor device 25 is rotatably supported by a ball bearing 27 built in the rear part of the motor body 26 and the ball bearing 23.

  A boss 30a of a filter holder 30 provided with a suction port 31 is inserted into the front end portion of the output shaft 28 disposed so as to face the casing 12, and the nut 30 is screwed to fix the holder 30. is doing. In the body portion of the filter holder 30, a plurality of through holes 32 are formed and an annular groove 33 for sealing is formed. A flange 39 a of the cylindrical body 39 of the rotary filter 38 is fastened and fixed to the suction port 31 of the filter holder 30 by a bolt 36.

  As shown in FIG. 2, the rotary filter 38 has a large number of ridges 44 arranged in a zigzag manner on the outer periphery of a cylindrical body 39 having a large number of air passage holes 40 through a filter reinforcement 41 made of wire mesh. The filter material 43 formed in this way is attached. Face plates 46 and 47 are respectively attached to both ends of the filter material 43 and are fixed by an adhesive. The roughness of the filter material 43 is about 1 to 0.3 μm mesh.

  A disc-shaped wire brush 51 is fastened and fixed by a bolt 56 through a circular seat plate 49 at the center of the tip of the cylindrical body 39. As shown in FIG. 3, the wire brush 51 has a large number of thin wire brush pieces 54 implanted around the outer periphery of a shaft portion 52 in which a shaft hole 53 is formed.

  The rotary filter 38 is provided to be driven and rotated by the motor device 25 at about 300 rpm.

  A fixture 59 of an air blow nozzle 61 disposed on the outer upper side of the rotary filter 38 is attached to the upper portion of the case 16. A supply hose 60 connected to the air supply means is connected to the supply port 59a of the fixture 59. The air blow nozzle 61 is provided with several outlets 62.

The air supply means uses a Roots-type blower different from the Roots-type blower 67 used in the collection unit 10 or air of factory equipment.
However, the air amount of the air supply means is about 20 to 60% with respect to the intake air amount of the collection unit 10, and the pressure is about 20 kPa.

The fume dust discharge pipe 18 is detachably provided with a tank 65 having a caster for collecting the fume dust removed from the collection unit 10. Further, the suction side of a three-leaf rotor type Roots-type blower 67 is connected to the exhaust port 13 of the collection unit 10. In this embodiment, the intake portion 68 of the Roots-type blower 67 is provided integrally with the casing 12, but the present invention is not limited to this, and a separate structure may be used. Reference numeral 69 denotes a silencer connected to the exhaust side 67 b of the roots type blower 67.
The dust collector C which concerns on this invention is comprised by the above.

Next, the operation of the dust collector C according to the present invention will be described.
(1) As shown in FIG. 4, it is assumed that the fumes h having a viscosity are generated by performing arc welding on the oil coating or the coated work 73 set on the pedestal 72.
(2) In the dust collector C, the suction pipe 71 connected to the suction port 21 and the inside of the collection unit 10 are maintained at a negative pressure by the operation of the Roots-type blower 67. The generated hume h flows into the case 16 through the suction pipe 71 together with the surrounding air.
(3) In the collection unit 10, the rotary filter 38 and the wire brush 51 are rotated at 300 revolutions per minute by the motor device 25. The viscous fume h contained in the air sucked into the case 16 is granulated by the striking action caused by the rotation of the wire brush 51 and separated and removed by the rotary filter 38.
(4) The fume dust separated and removed by the rotary filter 38 falls through the discharge pipe 18 and is stored in the recovery tank 65.
(5) The air purified by the rotary filter 38 is discharged to the outside through the intake portion 68, the roots type blower 67, and the silencer 69.

  In addition, if fume adheres to the filter material 43 of the rotary filter 38, the collection performance deteriorates. Therefore, the filter material 43 is cleaned by blowing pressure air ejected from the air blow nozzle 61 to the filter material 43 every predetermined time. It is preferable to do.

(Experiment 1)
About the dust collector C according to the present invention, the collection performance for collecting viscous fumes (wet fume) generated when arc welding is performed on oil-coated or painted welding materials, and the vacuum pressure of the collection unit Experiments were conducted on the loss (pressure loss) under the following conditions. The results are shown in the graph of FIG.
In the experimental apparatus, arc welding was performed on a circular iron plate continuously rotated using a 1.5 mm welding wire to generate fumes, and the fumes were collected by a dust collector C. In addition, there were interruptions in the welding work due to nighttime breaks, welding wire replacement work, etc., but the graphs represented the data continuously.

(Dust collector C)
Collection unit Rotary filter: Filter material Chemical synthetic nonwoven mesh 0.3μm
Diameter 200mm x length 200mm
: 3 wire brushes 250mm diameter x 20mm thickness
Rotation speed: 300rpm
Motor device output: 0.4 kW
Roots-type blower: 65mm diameter x 2.2kw output
Rotation speed: 2300rpm
Suction air volume: 2.5 m ³ / min Roots blower for air blow: Diameter 32 mm x Output 0.75 kW
Rotation speed: 2500rpm
Discharged air amount: 0.50 m ³ / wet fume concentration on the suction side of the collection unit: 7 to 10 mg / m ³

As a result of the experiment, it was confirmed that the fume concentration at the exhaust port of the Roots-type blower was about 0.01 mg / m ³ , and the low concentration state could be maintained for a long time. About pressure loss, the value of about -5 kPa was shown over the long term, and the favorable result was obtained.

Schematic diagram of a dust collector according to the present invention Longitudinal section of the main part of the collection unit Perspective view of wire brush Explanatory drawing when the dust collector according to the present invention is used for arc welding work Graph showing experimental results of collection performance and pressure loss in the dust collector of the present invention

Explanation of symbols

C ... Dust collector 10 of first embodiment of the present invention ... Collecting unit 16 ... Case 25 ... Motor device 28 ... Rotating shaft 38 ... Rotating filter 43 ... Filter material 51 ... Wire brush 61 ... Air blow nozzle 67 ... Roots type blower

Claims (1)

A collecting unit that sucks and collects the viscous fumes generated by arc welding together with the surrounding air, and creates a negative pressure in the case of the collecting unit and discharges the air that has passed through the unit to the outside In a dust collector composed of a roots-type blower that
The collection unit fixes a filter holder having a suction port on a front surface to a rotation shaft of a motor device arranged so as to face the case, and fixes a rotary filter cylinder to the front surface of the filter holder. A filter material in which a large number of wrinkles are continuously formed in a zigzag manner by a non-woven fabric having a predetermined roughness is attached to the outer peripheral portion of the cylinder having a large number of air passage openings, and the center of the tip of the cylinder is Is provided with a disk-shaped wire brush, the rotary filter and the wire brush are rotated at a predetermined rotational speed by a motor device, and the fume removed by the rotary filter is provided in a discharge pipe provided in the case. When a tank for collecting dust is detachably provided, and the viscous fume flowing into the case is granulated by the striking action by the rotation of the wire brush. The rotary filter separates and removes fumes and exhausts the filtered air to the suction side of the Roots-type blower. Pressure air is supplied from the air blow nozzle disposed in the case to the outer peripheral surface of the rotary filter. A dust collector characterized by being configured to be able to clean the filter by spraying.

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