JP2004358442A - Recovery apparatus for dust - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recovery apparatus for highly efficiently capturing and recovering mist and dust containing an oil and a water, and weld fumes dusts containing the oil. <P>SOLUTION: The mist and the dust containing oil and water are sucked from a suction hose 10 into a first screen tank 20 with peripheral air by negative pressure action due to positive rolling operation of a displacement type blower (60), and a relatively heavy material included therein falls by a slewing air current generated in the tank and a decrease phenomenon of an air flow velocity due to a cyclone 26. At a second screen tank 40, the mist and the fine dust left in air, which is sucked by a demister material 50, are captured, and purified air is discharged from the exhaust port of the displacement type blower to the atmosphere side. The captured mist and dust can respectively be recovered from the discharge section of the first screen tank and the second discharge tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a recovery device for removing mist and dust containing oil and water generated in metal working / polishing and air blowing operations, and removes fume dust generated in arc welding operations, particularly fumes containing oil. It relates to a recovery device.
[0002]
[Prior art]
A blow-off method using compressed air is generally used for the work of removing dust generated in metal working / polishing work or air blow work. In addition, a mist collection device using a blower such as a turbo fan, a vacuum cleaner using an ejector that generates a vacuum by supplying compressed air, and the like are partially adopted.
For collecting fumes generated during welding, an apparatus that combines elements of various materials and an adsorption function using static electricity and collects and collects fumes using a blower such as a turbofan has been used. As a welding fume dust collecting device using a roots-type blower as a positive displacement blower, the present applicant has disclosed in Japanese Patent Nos. 3137601, 3188416, and 3316476. .
[0003]
[Problems to be solved by the invention]
In the former blowing method, dust is scattered to the surroundings, thereby contaminating the working environment and adversely affecting the worker's health. Further, in a mist collection device using a turbofan or a vacuum cleaner using an ejector, clogging of a filter frequently occurs, and the clogging significantly reduces the amount of sucked air. become worse. Regarding the collection of fume dust generated during arc welding work, fume dust is an ultrafine dust having a particle diameter of 1 to 0.01 μm, and especially fume containing oil is slightly viscous. It has been difficult. Furthermore, fume dust is harmful to the human body, and causes pneumoconiosis if workers inhale it for a long period of time. For this reason, development and provision of equipment that can prevent workers from inhaling fume dust as much as possible are also important issues from the viewpoint of occupational health and safety.
[0004]
An object of the present invention is to provide a collection device for collecting and collecting mist and dust containing oil and moisture and welding fume dust containing oil with high efficiency.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 comprises a screen tank provided with a suction hose for sucking mist or dust containing oil and water, and a positive-displacement switchable positive displacement blower. And the exhaust side of the screen tank is connected to the suction side of the positive displacement blower, and during normal operation of the positive displacement blower, mist and dust in the air sucked from the suction hose are collected, and the reverse flow is performed. It is provided so as to wash the internal filter by discharging the outside air sucked during the operation into the screen tank, and a take-out part for collecting the dust settled by the washing is provided at the bottom of the screen tank. In the collection device,
The screen tank includes a first screen tank and a second screen tank, and the first screen tank is provided with a cyclone formed in the tank body so as to expand in a trumpet shape toward the bottom, and the tank body is provided with a cyclone. The outlet of the suction pipe provided at the top of the tank is arranged in the inner circumferential direction of the body of the tank body, and the suction hose is connected to the inlet of the suction pipe. The second screen tank includes the filter And the exhaust side of the cyclone is connected to the intake side of the second screen tank.
[0006]
In order to achieve the same object, the invention described in claim 2 has a screen tank provided with a suction hose for sucking fume dust containing oil, and a positive-displacement switchable positive displacement blower on a machine base. Installed, the exhaust side of the screen tank is connected to the suction side of the positive displacement blower, and during normal operation of the positive displacement blower, fume dust in the air sucked from the suction hose is collected, and during the reverse operation. Dust collection provided by discharging the sucked outside air into the screen tank to wash the internal filter and providing a take-out unit at the bottom of the screen tank for collecting fume dust settled by the washing. In the device,
The screen tank includes a first screen tank, a second screen tank, and a third screen tank. The first screen tank includes a cyclone formed in the tank body so as to expand in a trumpet shape toward the bottom. A second screen tank provided so that an outlet portion of a suction pipe provided at an upper portion of the tank body is arranged in an inner circumferential direction of a body portion of the tank body and the suction hose is connected to an inlet portion of the suction pipe. Is provided so as to accommodate the demister material as the filter, and the third screen tank is formed of a non-woven fabric having a mesh of 0.1 to 0.5 μm with a Teflon coating on the surface and formed into a cylindrical shape. And the exhaust side of the cyclone is connected to the intake side of the second screen tank, 2 screen tank and a third screen tank is characterized in that formed by connecting in series.
[0007]
Function and effect of the present invention
(Invention of claim 1)
The mist and dust containing oil and water are sucked into the first screen tank together with the surrounding air from the suction hose by the negative pressure effect of the positive rotation operation of the positive displacement blower, and the swirling airflow generated in the first screen tank is generated. A relatively heavy object falls due to a decrease in the air flow velocity due to the cyclone. Next, mist and fine dust remaining in the air sucked by the demister material of the second screen tank are collected, and the clean air is discharged to the atmosphere side from the discharge port of the positive displacement blower. Then, the collected mist and dust can be collected from the take-out portions of the first screen tank and the second screen tank, respectively.
[0008]
When dust adheres to the demister material of the second screen tank and causes clogging, the outside air is discharged into the second screen tank and the first screen tank by the backwashing action by the reverse operation of the positive displacement blower. Thereby, dust adhering to the demister material is removed. The fine dust that has been removed and settled in the tank body can be collected from the take-out part.
[0009]
(Invention of claim 2)
The fume dust containing oil is sucked into the first screen tank together with the surrounding air from the suction hose by the negative pressure effect of the positive displacement operation of the positive displacement blower, and is generated by the swirling airflow and cyclone generated in the first screen tank. A relatively heavy object falls due to a decrease in the air flow velocity. Then, minute fume dust remaining in the air sucked by the demister material of the second screen tank and the filter of the third screen tank is gradually collected, and the purified air is discharged from the discharge port of the positive displacement blower to the atmosphere. Discharged to the side. Then, the collected mist and dust can be collected from the take-out portions of the first screen tank, the second screen tank, and the third screen tank, respectively.
[0010]
When fume dust adheres to the demister material of the second screen tank and the filter of the third screen tank and causes clogging, it is possible to remove the fume dust by the backwashing operation by the reverse operation of the positive displacement blower described above. it can.
[0011]
According to this dust collecting apparatus, it is possible to collect and collect mist and dust containing oil and moisture and welding fume dust containing oil with high efficiency.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a part of a dust collection device A of the first embodiment in a cutaway view, and FIG. 2 is a view showing a part of a dust collection device B of a second embodiment in a cutaway view. FIG.
[0013]
(First Embodiment)
The dust collection device A shown in FIG. 1 is used for removing mist and dust containing oil and water generated in metal working / polishing and air blow operations. In this recovery apparatus A, the first screen tank 20 and the second screen tank 40 are arranged in series, and these and a roots-type blower 60 as a positive-displacement-type positive-displacement blower are installed on the gantry 1 with casters. It has a general configuration.
[0014]
The first screen tank 20 has an upper lid 25 attached to a cylindrical tank body 21 having an open top so as to keep the inside airtight. At the center of the upper lid 25, a curved tube portion 27 integrally formed on the small diameter side of a cyclone 26 formed to expand in a trumpet shape toward the bottom 21b of the tank body 21 so as to communicate with the inside. Provided. The size of the opening 26 a on the large diameter side of the cyclone 26 is provided to be approximately の of the inner diameter of the tank body 21.
[0015]
A discharge port 22 for discharging air at the time of back washing to the atmosphere side is formed in the body of the tank body 21, and a check valve 23 is provided in the discharge port 22. Reference numeral 24 denotes a filter provided so as to cover the periphery of the check valve 23.
[0016]
Reference numeral 30 denotes a suction pipe provided to penetrate the upper lid 25. The outlet portion 30a inside the suction pipe 30 is arranged slightly downward in the inner circumferential direction of the body of the tank body 21. The check valve 15 is attached to the inlet 30b of the suction pipe 30. The other end of the suction hose 10 having a trumpet-shaped suction port 11 at the end is connected to the check valve 15.
[0017]
Reference numeral 31 denotes a drawer-shaped collection container (take-out unit) for storing separated mist and dust, and the collection container 31 is provided to be inserted into the bottom 21b side of the tank body 21. In addition, it is also possible to use the drain cock 33 instead of this collection container 31.
[0018]
The second screen tank 40 has an upper lid 45 attached to a cylindrical tank main body 41 having an open top so as to keep the inside airtight. An intake pipe 46 provided in the upper lid 45 and a curved pipe section 27 of the cyclone 26 are connected by a hose 47. The second screen tank 40 is provided so that the internal space of the tank main body 41 is partitioned by a mesh-like partition plate 42, a demister material 50 as a filter is accommodated in the upper portion thereof, and a collision plate 52 is placed thereon. .
[0019]
As the demister material 50, two H-types of Nippon Mesh Kogyo Co., Ltd. (density 80 kg / m ³ , space ratio 99.0%, surface area 158 m ² / m ³ , material SUS304, outer diameter 300 mm, thickness 150 mm) are stacked. used.
[0020]
Reference numeral 53 denotes a drawer-shaped collection container for storing the separated mist and dust. The collection container 53 is provided to be inserted into the bottom 41b of the tank body 41. Note that a drain cock 55 can be used instead of the collection container 53.
[0021]
The roots blower 60 uses a three-lobe roots blower, and the suction side 61 is the discharge side and the discharge side 62 is the suction side during reverse rotation. Reference numeral 65 denotes a suction pipe connecting the suction side 61 of the roots-type blower 60 and the exhaust pipe 43 of the second screen tank 40. 66 is a silencer attached to the discharge side 62 of the roots blower 60.
[0022]
As described above, the mist and dust in the air sucked from the suction hose 10 during the forward rotation operation of the roots type blower 60 are collected, and the outside air sucked during the reverse rotation operation is stored in the second screen tank 40 and the first screen tank 20. A dust collection device A provided to discharge and discharge the demister material 50, the cyclone 26, and the like is configured.
[0023]
(Second embodiment)
The dust collecting apparatus B shown in FIG. 2 is used for removing fume dust generated in an arc welding operation, particularly, fume dust containing oil. In the recovery device B, a first screen tank 120, a second screen tank 140, and a third screen tank 160 are arranged in series, and a roots-type blower 180 as a positive-displacement switchable positive displacement blower is arranged. It has a schematic configuration installed on a gantry 101 with casters.
[0024]
Regarding the dust collecting device B, since the third screen tank is further arranged in series with the second screen tank 40 of the dust collecting device A described above, The configuration will be described, and the same components as those of the dust collection device A will be denoted by the reference numerals used in the description in the drawing as hundreds, and the description of the other components will be omitted.
[0025]
The third screen tank 160 has an upper lid 175 attached to a cylindrical tank body 161 having an open top so as to keep the inside airtight. A substantially L-shaped suction pipe 162 is disposed at the center of the tank body 161, and a support plate 163 on which a fixed shaft 164 is erected is provided at an inner end of the suction pipe 162. The outer end of the suction pipe 162 is connected to the second screen tank 140 via the suction pipe 148. Further, a cylindrical rotary nozzle 166 is rotatably provided on the fixed shaft 164 via a bearing 165. A vertically long opening (not shown) is formed in the body periphery of the rotary nozzle 166 so as to be opened substantially in a tangential direction.
[0026]
Reference numeral 168 denotes a filter formed in a cylindrical shape using a nonwoven fabric having a mesh of 0.1 to 0.5 μm and having a Teflon coating (Teflon is a registered trademark) on the surface. The filter 168 is arranged outside the rotary nozzle 166. The lower end of the filter 168 is placed on the support plate 163, the upper end of the filter 168 is fitted with the cover 169, and the thumb screw 170 is fastened to the fixed shaft 164 to be fixed.
Note that such a filter structure is disclosed and known in Japanese Patent No. 3316476 of the present applicant.
[0027]
Reference numeral 176 denotes a drawer-shaped collection container for storing the separated fume dust. The collection container 176 is provided so as to be inserted into the bottom 161b of the tank body 161.
[0028]
The roots-type blower 180 uses a three-lobe roots-type blower, and the suction side 181 is the discharge side and the discharge side 182 is the suction side during reverse rotation. Reference numeral 185 denotes a suction pipe that connects the suction side 181 of the roots-type blower 180 and the exhaust pipe 172 of the third screen tank 160. 186 is a silencer attached to the discharge side 182 of the roots blower 180.
[0029]
As described above, the fume dust in the air sucked from the suction hose 110 is collected during the forward rotation operation of the roots blower 180, and the outside air sucked during the reverse rotation operation is removed from the third screen tank 160, the second screen tank 140, A dust collection device B provided to discharge the filter 168, the demister material 150, the cyclone 126, and the like by discharging into the one screen tank 120 is configured.
[0030]
(Experiment)
With respect to the dust collection apparatus A of the present invention, an oil mist was generated using a commercially available spray gun, and a collection performance experiment was performed. The roots-type blower used had an air volume of 1.5 m ³ per minute.
[0031]
As a result of the experiment, the recovery amount was 104.7 g with respect to the generation amount of 107.4 g of oil mist, and the recovery efficiency was 97.5%. Further, when the measurement was performed using an experimental apparatus including only the second screen tank 40 except for the first screen tank 20 having the cyclone, the recovery efficiency was 91.3%.
Therefore, it was confirmed that according to the dust collection device A of the present invention, a high collection effect can be obtained. The fume dust collection performance experiment was also performed on the dust collection device B, and it was confirmed that a high collection effect of 99.9% could be obtained.
[0032]
As described above, this dust collecting apparatus has an advantage that it can collect and collect mist and dust containing oil and moisture and welding fume dust containing oil with high efficiency.
[Brief description of the drawings]
FIG. 1 is a front view showing a part of a dust collection device A cut away. FIG. 2 is a front view showing a part of a dust collection device B cut away.
A: Dust collection device 10: Suction hose 20: First screen tank 21: Tank body 26: Cyclone 27: Curved pipe section 30: Suction pipe 30a -Outlet 30b-Inlet 40-Second screen tank 41-Tank body 46-Intake pipe 50-Demister material 60-Roots-type blower (capacitive blower)
B: Dust collection device 110: Suction hose 120: First screen tank 140: Second screen tank 160: Third screen tank 161: Tank body 168: Filter 180 Roots blower (displacement blower)

Claims (2)

A screen tank equipped with a suction hose for sucking mist and dust containing oil and water, and a positive displacement blower capable of switching between forward and reverse are installed on the machine base, and the exhaust side of the screen tank is connected to the positive displacement blower. It is connected to the suction side and collects mist and dust in the air sucked from the suction hose during the normal operation of the positive displacement blower, and discharges the outside air sucked into the screen tank during the reverse operation. In the dust collection device provided to wash the filter of the, the take-out unit for collecting the dust settled by the washing is provided at the bottom of the screen tank,
The screen tank comprises a first screen tank and a second screen tank,
The first screen tank is provided with a cyclone formed in the tank main body so as to expand in a trumpet shape toward the bottom, and an outlet of a suction pipe provided at an upper part of the tank main body is formed around the inner periphery of the body of the tank main body. Arranged so as to connect the suction hose to the inlet of the suction pipe,
The second screen tank is provided so as to accommodate the demister material as the filter,
A dust collecting device, wherein an exhaust side of the cyclone is connected to an intake side of a second screen tank. A screen tank equipped with a suction hose for sucking fume dust containing oil and a positive displacement blower capable of switching between forward and reverse operation are installed on the machine base, and the exhaust side of the screen tank is set to the suction side of the positive displacement blower. To collect fume dust in the air sucked from the suction hose at the time of normal rotation operation of the positive displacement blower, and discharge the external air sucked at the time of reverse rotation operation into the screen tank, thereby forming an internal filter. In a dust collection device provided to be washed, a take-out unit for collecting fume dust settled by the washing is provided at the bottom of the screen tank,
The screen tank comprises a first screen tank, a second screen tank, and a third screen tank,
The first screen tank is provided with a cyclone formed in the tank main body so as to expand in a trumpet shape toward the bottom, and an outlet of a suction pipe provided at an upper part of the tank main body is formed around the inner periphery of the body of the tank main body. Arranged so as to connect the suction hose to the inlet of the suction pipe,
The second screen tank is provided so as to accommodate the demister material as the filter,
The third screen tank is provided so as to accommodate a filter formed in a cylindrical shape using a nonwoven fabric of 0.1 to 0.5 μm mesh with a Teflon coating on the surface,
A dust collecting device, wherein an exhaust side of the cyclone is connected to an intake side of a second screen tank, and the second screen tank and the third screen tank are connected in series.

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