Welding waste gas treatment system and filtering mechanism thereof

Abstract

The utility model belongs to the field of waste gas treatment equipment, and particularly relates to a welding waste gas treatment system and a filtering mechanism thereof, the filtering mechanism comprises a box body, a collecting mechanism is arranged at the bottom of an inner cavity of the box body, a filtering assembly is arranged at the upper part of the inner cavity of the box body, and an air inlet is formed in the side wall of the box body between the collecting mechanism and the filtering assembly; an exhaust port is formed above the filtering assembly; the filtering assembly comprises a horizontal rotating disc, a plurality of filter screens which are circumferentially and uniformly distributed around the center of the rotating disc are arranged on the rotating disc, and the rotating disc is connected with a rotation driving mechanism; and an air inlet cylinder is arranged above one filter screen and is connected with an air supply mechanism. According to the utility model, each filter screen can be washed in sequence to prevent the filter screens from being blocked; and when the filter screen is washed, other filter screens can work normally, shutdown is not needed, and the treatment efficiency is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment equipment, and in particular to a welding waste gas treatment system and its filtration mechanism. Background Technology

[0002] The welding process of metal parts generates waste gas, the main pollutants of which include metal particles and harmful gases. The metal particles originate from the high-temperature evaporation or oxidation of the welding rod and base material, and include oxides of metals such as iron, manganese, aluminum, chromium, nickel, and lead. Harmful gases include ozone, nitrogen oxides, and carbon monoxide. Currently, filtration mechanisms are typically used to separate the metal particles. However, traditional filtration mechanisms suffer from problems such as easy clogging of the filter screen, requiring frequent cleaning and replacement, making maintenance inconvenient.

[0003] Existing welding exhaust gas treatment equipment can be referenced from the utility model patent application number CN202321771630.X, which describes a welding exhaust gas cleaning device. This device uses a reciprocating vibrating filter to shake off smaller dust particles accumulated on the filter screen into a drawer below, thus collecting the particles and reducing the risk of filter clogging. Then, an activated carbon filter is used to adsorb harmful gases. While this treatment equipment reduces the risk of filter clogging, the eccentric wheel's rotation drives the filter screen to vibrate up and down, creating friction between the eccentric wheel and the filter screen, which affects the filter's lifespan. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a welding exhaust gas treatment system and its filtration mechanism, which can prevent the filter screen from being blocked, reduce the frequency of filter screen cleaning and replacement, and at the same time ensure the service life of the filter screen.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: a filter mechanism, including a box, a collection mechanism is provided at the bottom of the inner cavity of the box, a filter assembly is provided at the upper part of the inner cavity of the box, an air inlet is provided on the side wall of the box between the collection mechanism and the filter assembly, and an exhaust port is provided above the filter assembly.

[0006] The filter assembly includes a horizontal turntable with multiple filter screens evenly distributed in a circular pattern around the center of the turntable. The turntable is connected to a rotation drive mechanism. An air inlet is located above one of the filter screens and is connected to an air supply mechanism.

[0007] Furthermore, the rotation drive mechanism is disposed on the upper surface of the housing, and the rotation drive mechanism is connected to the turntable via a vertical transmission shaft.

[0008] Furthermore, a horizontal support ring plate is provided on the inner wall of the box, the edge of the turntable is supported by the support ring plate, and an elastic sealing gasket is provided between the turntable and the support ring plate.

[0009] Furthermore, the air supply mechanism is an air pump.

[0010] Furthermore, the lower part of the box is conical, and the outer wall of the box is provided with multiple support legs.

[0011] Furthermore, the collection mechanism is an L-shaped collection tube, one end of which is detachably connected to the lower end of the box, and the other end of which is provided with a detachable end cap.

[0012] Furthermore, activated carbon adsorption packing is provided inside the exhaust port.

[0013] The welding exhaust gas treatment system includes a gas collection hood and the aforementioned filtration mechanism. The gas collection hood is connected to the air inlet via a pipe, and the exhaust port is connected to an air intake fan.

[0014] Furthermore, it also includes a wet scrubbing tower, the bottom of which is connected to an exhaust port, and the top of which is equipped with a spray head and a liquid replenishment and venting port. The spray head is connected to a spray pipe, and the spray pipe is connected to the bottom of the wet scrubbing tower through a delivery pump.

[0015] Furthermore, it also includes a base, on which the gas collection hood, filtration mechanism and wet scrubbing tower are all mounted.

[0016] The beneficial effects of this invention are as follows: When the filtration mechanism is running, the filter screen below the air inlet cylinder is basically inactive, while the remaining filters filter the welding exhaust gas. After filtration for a period of time, the turntable rotates at a certain angle, moving the next filter screen to the bottom of the air inlet cylinder. Then, air at a certain pressure is introduced into the air inlet cylinder using the air supply mechanism. The air washes over the filter screen below the air inlet cylinder, blowing particles from the filter holes into the space below, thereby alleviating filter screen clogging. Because multiple filter screens are evenly distributed in a circular shape around the center of the turntable, when the turntable rotates, it can move each filter screen sequentially to the bottom of the air inlet cylinder. Therefore, each filter screen can be washed sequentially, preventing filter screen clogging. Moreover, while washing the filter screens, the other filter screens can work normally without stopping the machine, ensuring processing efficiency. Compared with the prior art, the filter screens of this invention will not wear out, have a guaranteed service life, and do not require frequent replacement. Attached Figure Description

[0017] Figure 1 This is a front sectional view of the filtration mechanism of this utility model;

[0018] Figure 2 This is a front sectional view of the welding exhaust gas treatment system of this utility model;

[0019] Reference numerals: 1—Box body; 2—Collection mechanism; 3—Turntable; 4—Filter screen; 5—Rotation drive mechanism; 6—Air inlet cylinder; 7—Air supply mechanism; 8—Air inlet; 9—Exhaust outlet; 10—Support ring plate; 11—Drive shaft; 12—Elastic sealing gasket; 13—End cover; 14—Support leg; 15—Activated carbon adsorption packing; 100—Gas collection hood; 200—Wet scrubbing tower; 201—Spray head; 202—Spray pipe; 203—Transfer pump; 204—Liquid replenishment and drain port; 300—Base; 400—Suction fan. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] The filtration mechanism of this utility model, such as Figure 1 As shown, the device includes a housing 1. A collection mechanism 2 is located at the bottom of the inner cavity of the housing 1, and a filter assembly is located at the top of the inner cavity of the housing 1. An air inlet 8 is located on the side wall of the housing 1 between the collection mechanism 2 and the filter assembly, and an exhaust port 9 is located above the filter assembly. The housing 1 is a circular metal housing, and its inner and outer walls are coated with anti-corrosion paint to improve corrosion resistance. The air inlet 8 is used to introduce welding exhaust gas into the housing 1, the filter assembly is used to filter the welding exhaust gas, the collection mechanism 2 is used to collect the filtered metal particles, and the exhaust port 9 is used to discharge the filtered exhaust gas.

[0022] In this invention, the filter assembly includes a horizontal turntable 3. The edge of the turntable 3 has a good seal with the inner wall of the housing 1 to prevent welding fumes from passing through the gap between the edge of the turntable 3 and the inner wall of the housing 1. Multiple filter screens 4 are evenly distributed circumferentially around the center of the turntable 3 on the turntable 3. The filter screens 4 can be circular and any existing filter screen can be used, such as stainless steel wire mesh. Multiple through holes are provided on the turntable 3, and each filter screen 4 covers one through hole. The edge of the filter screen 4 can be connected to the turntable 3 with screws, allowing for easy disassembly and assembly of the filter screen 4 for later maintenance. The turntable 3 is connected to a rotation drive mechanism 5, which drives the turntable 3 to rotate. An air inlet cylinder 6 is provided above one of the filter screens 4, and the air inlet cylinder 6 is connected to an air supply mechanism 7. The air inlet cylinder 6 covers the filter screen 4 below it, and the lower end of the air inlet cylinder 6 slides in fit with the turntable 3, with a good seal between the air inlet cylinder 6 and the turntable 3.

[0023] When using this filtration mechanism, welding exhaust gas enters the housing 1 through the air inlet 8. As the exhaust gas flows upward to the turntable 3, the metal particles carried in the exhaust gas are blocked by the filter screen 4 and remain inside the housing 1, gradually falling downward into the collection mechanism 2. The exhaust gas then flows through the filter screen 4 to the top of the turntable 3 and is finally discharged from the exhaust port 9. After running for a period of time, the filter screen 4 may become clogged. At this time, the air supply mechanism 7 can be activated to introduce air at a certain pressure into the air inlet cylinder 6. The air will then backwash the filter screen 4 below the air inlet cylinder 6, blowing the particles inside the filter holes below the filter screen 4. Then, the rotation drive mechanism 5 drives the turntable 3 to rotate at a specific angle, moving the next filter screen 4 to the bottom of the air inlet cylinder 6 for flushing. Because multiple filters 4 are evenly distributed in a circular pattern around the center of the turntable 3, the turntable 3 can drive each filter 4 to move sequentially to below the air intake 6, thereby flushing and cleaning all the filters 4 in turn, preventing clogging and affecting filtration efficiency. In addition, only one filter 4 is flushed at a time, while the remaining filters 4 can work normally, allowing the filtration mechanism to operate continuously without shutdown.

[0024] The rotary drive mechanism 5 can be installed inside the housing 1. To prevent various gases in the exhaust gas from corroding the rotary drive mechanism 5, the rotary drive mechanism 5 of this invention is set on the upper surface of the housing 1, and the rotary drive mechanism 5 is connected to the turntable 3 through a vertical transmission shaft 11. Specifically, the rotary drive mechanism 5 can be a stepper motor.

[0025] To improve the stability of the turntable 3, a horizontal support ring plate 10 is provided on the inner wall of the housing 1. The edge of the turntable 3 is supported by the support ring plate 10, and an elastic sealing gasket 12 is provided between the turntable 3 and the support ring plate 10. The elastic sealing gasket 12 can be made of rubber or the like, which can improve the sealing performance at the edge of the turntable 3.

[0026] In this invention, the air supply mechanism 7 is an air pump, but a fan or other equipment can also be used.

[0027] To facilitate the collection of filtered metal particles, the lower part of the housing 1 is a cone shape with the pointed end facing downwards. The metal particles gradually slide down the inner wall of the lower part of the housing 1 and gradually concentrate at the bottom of the housing 1. The outer wall of the housing 1 is provided with multiple support legs 14, which can be three or four, to provide stable support for the housing 1.

[0028] In this invention, the collecting mechanism 2 is an L-shaped collecting tube. One end of the collecting tube is detachably connected to the lower end of the housing 1, and the other end of the collecting tube is provided with a detachable end cap 13. The collecting tube can be threaded to the lower end of the housing 1, and the end cap 13 can also be threaded to the collecting tube. Every so often, the collecting tube can be removed from the housing 1, and then the end cap 13 can be opened to pour out the metal particles inside the collecting tube.

[0029] To further remove harmful gases from welding exhaust gas, activated carbon adsorption packing 15 is installed inside exhaust port 9. The activated carbon adsorption packing 15 can be installed using existing technology, is detachable and installed inside exhaust port 9, and can be replaced periodically.

[0030] The welding exhaust gas treatment system of this utility model, such as Figure 2 As shown, it includes a gas collection hood 100 and Figure 1 The filter mechanism shown has a gas collection hood 100 connected to an air inlet 8 via a pipe, and an exhaust port 9 connected to an intake fan 400. The gas collection hood 100 is located near the welding device. When the welding equipment is running, the intake fan 400 is started to draw the welding exhaust gas into the gas collection hood 100 and then transport the exhaust gas to the filter mechanism through a pipe.

[0031] When the welding workload is small and the amount of welding exhaust gas generated is small, a filtration system can be used to treat the welding exhaust gas, and the treated gas can be directly discharged into the air.

[0032] When the welding workload is large and a lot of welding fumes are generated, in order to ensure the fumes treatment effect, the welding fumes treatment system of this utility model also includes a wet scrubbing tower 200. The bottom of the wet scrubbing tower 200 is connected to the exhaust port 9. The top of the wet scrubbing tower 200 is provided with a spray head 201 and a liquid replenishment and drainage port 204. The spray head 201 is connected to a spray pipe 202. The spray pipe 202 is connected to the bottom of the wet scrubbing tower 200 through a delivery pump 203.

[0033] The wet scrubbing tower 200 stores an appropriate amount of cleaning fluid. Since the harmful components in welding exhaust gas are mostly acidic gases, an alkaline cleaning fluid can be used. The exhaust gas, after being treated by the filtration mechanism, enters the bottom of the wet scrubbing tower 200 and flows upwards. The cleaning fluid in the wet scrubbing tower 200, driven by the transfer pump 203, flows to the spray head 201 and sprays downwards to clean the exhaust gas, removing residual harmful gases and particles. The cleaned exhaust gas is discharged through the replenishment drain port 204. As the liquid is consumed, cleaning fluid can be replenished to the wet scrubbing tower 200 through the replenishment drain port 204. When the equipment is not running, the replenishment drain port 204 can be sealed with a sealing cap.

[0034] To facilitate the overall movement of this welding exhaust gas treatment system, the system also includes a base 300, a gas collection hood 100, a filter mechanism, and a wet scrubbing tower 200, all mounted on the base 300. The base 300 can be equipped with casters at its bottom and a push rod at one end, allowing operators to move the entire system to a suitable location for greater flexibility.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filtering mechanism, comprising a housing (1), wherein a collecting mechanism (2) is provided at the bottom of the inner cavity of the housing (1), a filtering assembly is provided at the upper part of the inner cavity of the housing (1), an air inlet (8) is provided on the side wall of the housing (1) between the collecting mechanism (2) and the filtering assembly, and an exhaust port (9) is provided above the filtering assembly; characterized in that: The filter assembly includes a horizontal turntable (3), on which multiple filter screens (4) are evenly distributed in a circular shape around the center of the turntable (3), and the turntable (3) is connected to a rotation drive mechanism (5); an air inlet cylinder (6) is provided above one of the filter screens (4), and the air inlet cylinder (6) is connected to an air supply mechanism (7).

2. The filtration mechanism as described in claim 1, characterized in that: The rotation drive mechanism (5) is located on the upper surface of the housing (1), and the rotation drive mechanism (5) is connected to the turntable (3) through a vertical transmission shaft (11).

3. The filtration mechanism as described in claim 1, characterized in that: The inner wall of the box (1) is provided with a horizontal support ring plate (10), the edge of the turntable (3) is supported by the support ring plate (10), and an elastic sealing gasket (12) is provided between the turntable (3) and the support ring plate (10).

4. The filtration mechanism as described in claim 1, characterized in that: The gas supply mechanism (7) is an air pump.

5. The filtration mechanism as described in claim 1, characterized in that: The lower part of the box (1) is conical, and the outer wall of the box (1) is provided with multiple support legs (14).

6. The filtration mechanism as described in claim 5, characterized in that: The collecting mechanism (2) is an L-shaped collecting tube. One end of the collecting tube is detachably connected to the lower end of the box (1), and the other end of the collecting tube is provided with a detachable end cap (13).

7. The filtration mechanism as described in claim 1, characterized in that: The exhaust port (9) is provided with activated carbon adsorption packing (15).

8. A welding exhaust gas treatment system, characterized in that: It includes a gas collection hood (100) and a filter mechanism as described in claim 1, wherein the gas collection hood (100) is connected to the air inlet (8) via a pipe and the exhaust port (9) is connected to an air intake fan (400).

9. The welding exhaust gas treatment system as described in claim 8, characterized in that: It also includes a wet scrubbing tower (200), the bottom of which is connected to an exhaust port (9), and the top of the wet scrubbing tower (200) is provided with a spray head (201) and a liquid replenishment and drainage port (204). The spray head (201) is connected to a spray pipe (202), and the spray pipe (202) is connected to the bottom of the wet scrubbing tower (200) through a transfer pump (203).

10. The welding exhaust gas treatment system as described in claim 9, characterized in that: It also includes a base (300), on which the gas collection hood (100), the filter mechanism and the wet scrubbing tower (200) are all mounted.

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