A dust removal device for steel plate pretreatment line

Abstract

The utility model relates to the technical field of steel plate pretreatment lines, in particular to a dust removal device for steel plate pretreatment lines, which not only cleans up dust generated after grinding and dust brought by the steel plates themselves, thereby preventing dust from clogging the dust removal device, but also purifies and utilizes waste gas generated during painting, thereby reducing pollution emissions; the utility model comprises a conveying mechanism; a water delivery mechanism, two groups of cleaning mechanisms, a drying mechanism and an exhaust mechanism, wherein the water delivery mechanism is installed on the conveying mechanism and delivers clean water to the two groups of cleaning mechanisms, the two groups of cleaning mechanisms are both installed on the conveying mechanism and clean the steel plates, the drying mechanism is installed on the conveying mechanism and dries the steel plates, and the exhaust mechanism is installed on the water delivery mechanism and exhausts waste gas generated by painting.

Description

Technical Field

[0001] The utility model relates to the technical field of steel plate pretreatment lines, in particular to a dust removal device for steel plate pretreatment lines. Background Art

[0002] Steel plates and profiles need to be pretreated before use, that is, the oil, rust and oxide layer on the surface of the steel plate must be cleaned before processing, and a layer of protective primer must be applied. Pretreatment of steel plates can improve the corrosion resistance of mechanical products and metal components.

[0003] Existing dust removal devices, such as the steel plate pretreatment line dust removal system disclosed in the utility model patent with application number 200920231063.2, mainly include a sand collector, a shot blasting chamber body, and a dust collecting main pipe. The sand collector is connected to the bottom of the shot blasting chamber body through a first pipe. Three suction pipes are connected to the side walls at both ends of the shot blasting chamber body. The suction pipes on the side walls at both ends are connected to the suction ports provided at one end of the dust collecting main pipe. A bag dust collector is connected to the other end of the dust collecting main pipe. The dust collecting main pipe is connected to one end of a second pipe provided, and the other end of the second pipe is connected to the sand collector. When in use, a second pipe is provided between the dust collecting main pipe and the sand collector, through which dust in the sand collector is removed. The other end of the dust collecting main pipe is directly connected to the bag dust collector, thereby reducing pipe resistance.

[0004] However, most of the existing dust removal systems can only remove the dust generated during the sandblasting and grinding process, and it is difficult to clean the exhaust gas powder generated during the subsequent painting process. Moreover, the dust removal device is easily clogged after long-term use, and manual cleaning is required. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a steel plate pretreatment line dust removal device which not only cleans the dust generated after grinding and the dust brought by the steel plate, thereby preventing the dust from clogging the dust removal device, but also purifies and utilizes the exhaust gas generated during painting, thereby reducing pollution emissions.

[0006] The utility model discloses a dust removal device for a steel plate pretreatment line, comprising a conveying mechanism; a water delivery mechanism, two groups of cleaning mechanisms, a drying mechanism and an exhaust mechanism, wherein the water delivery mechanism is installed on the conveying mechanism and delivers clean water to the two groups of cleaning mechanisms, the two groups of cleaning mechanisms are both installed on the conveying mechanism and clean the steel plates, the drying mechanism is installed on the conveying mechanism and dries the steel plates, the exhaust mechanism is installed on the water delivery mechanism and extracts waste gas generated by spraying paint; the steel plates are conveyed to the conveying mechanism after being sandblasted and polished, the water delivery mechanism cleans the lower surface of the steel plates and delivers clean water to the two groups of cleaning mechanisms, the two groups of cleaning mechanisms clean the upper surface of the steel plates, the drying mechanism cleans the water stains on the surface of the steel plates and dries the steel plates at the same time, and the exhaust mechanism extracts and purifies the waste gas at the spraying paint location and accelerates the evaporation of water stains on the surface of the steel plates.

[0007] Preferably, the conveying mechanism includes a workbench, a dust cover, multiple groups of conveying rollers, a dust hopper, a drain pipe and a valve. The bottom end of the workbench is connected to the ground, the bottom end of the dust cover is connected to the top end of the workbench, the multiple groups of conveying rollers are rotatably installed on the workbench, the dust hopper is installed on the workbench and is located below the multiple groups of conveying rollers, the top end of the drain pipe is internally connected to the bottom end of the dust hopper, and the valve is installed on the drain pipe; the steel plate is conveyed to the multiple groups of conveying rollers after grinding, and the rotation of the multiple groups of conveying rollers drives the steel plate to continue to be conveyed forward. The dust cover is set to prevent dust on the steel plate from flying and affecting the workers and the environment. The waste water from cleaning the steel plate is finally collected in the dust hopper. After the valve is opened, the waste water is discharged from the dust hopper through the drain pipe, preventing dust accumulation and blockage.

[0008] Preferably, the water delivery mechanism includes an electric motor, a reducer, a water pump, a connecting pipe, a water delivery pipe, a water distribution pipe and multiple groups of high-pressure nozzles. The bottom end of the electric motor is connected to the top of the dust cover, the bottom end of the reducer is connected to the top of the dust cover, the bottom end of the water pump is connected to the top of the dust cover, the connecting pipe is installed on the water pump, the water delivery pipe is installed on the water pump, the water distribution pipe is installed on the workbench and is located below the conveying roller, and the water distribution pipe is connected to the inside of the water delivery pipe, and the multiple groups of high-pressure nozzles are all installed on the water distribution pipe and connected to the inside of the water distribution pipe; the connecting pipe is connected to the water source, the electric motor is started, the electric motor drives the water pump to pump water through the reducer, the water pump delivers clean water to the water distribution pipe through the water delivery pipe, the water distribution pipe distributes the clean water to the multiple groups of high-pressure nozzles, the high-pressure nozzles spray the clean water onto the lower surface of the steel plate to clean the lower surface of the steel plate, and the dust on the lower surface of the steel plate flows into the dust collecting hopper with the clean water.

[0009] Preferably, the cleaning mechanism includes two water distribution pipes, multiple groups of two high-pressure nozzles, one bevel gear, a rotating shaft, two bevel gears and a turntable. Two groups of grooves are opened on the dust cover. The water distribution pipe two is rotatably installed in the grooves of the dust cover and is connected with the inside of the water supply pipe. The multiple groups of two high-pressure nozzles are all installed on the water distribution pipe two, the bevel gear one is installed on the water distribution pipe two, the rotating shaft is rotatably installed on the dust cover, the bevel gear two is installed on the rotating shaft and meshes with the bevel gear one for transmission, and the turntable is installed on the rotating shaft; the staff drives the rotating shaft to rotate through the turntable, the rotating shaft drives the bevel gear two to rotate, the bevel gear two and the bevel gear one are meshed for transmission, the bevel gear one drives the water distribution pipe two to rotate so as to adjust the spray angle of the high-pressure nozzle two, the water supply pipe transports clean water through the water distribution pipe two to the multiple groups of two high-pressure nozzles, and the two high-pressure nozzles spray clean water onto the upper surface of the steel plate to clean the upper surface of the steel plate.

[0010] Preferably, the drying mechanism includes two groups of hydraulic cylinders, a V-shaped wiper, a cleaning roller brush and three groups of electric thermal resistance wires. The top of the two groups of hydraulic cylinders are connected to the top of the dust cover, the top of the V-shaped wiper is connected to the bottom of the two groups of hydraulic cylinders, the cleaning roller brush is rotatably installed on the workbench, the two groups of electric thermal resistance wires are installed on the dust cover, and one group of electric thermal resistance wires is installed on the dust collector; the two groups of hydraulic cylinders push the V-shaped wiper downward, and the V-shaped wiper and the cleaning roller brush cooperate to clean the upper and lower surfaces of the steel plate. At the same time, the V-shaped wiper discharges the waste water on the upper surface of the steel plate, and then the conveying roller drives the steel plate to continue to convey forward. The three groups of electric thermal resistance wires dry the steel plate, which not only evaporates the residual water on the surface of the steel plate, but also preheats the steel plate, which is convenient for subsequent painting of the steel plate.

[0011] Preferably, the exhaust mechanism includes a transmission shaft, an air pump, an exhaust pipe and an air supply pipe. The transmission shaft is rotatably mounted on the reducer, the bottom end of the air pump is connected to the top end of the dust cover, the exhaust pipe is mounted on the air pump and is connected to the inside of the paint spraying device on the steel plate pretreatment line, and the air supply pipe is mounted on the air pump and is connected to the inside of the dust hopper; the reducer drives the transmission shaft to rotate, and the transmission shaft drives the air pump to exhaust air, and the air pump exhausts the air generated during painting through the exhaust pipe, and then transports it to the dust hopper through the air supply pipe, and the impurities in the exhaust gas are dissolved in the wastewater in the dust hopper, and the purified gas floats upward and is heated by the electric heating resistance wire, which further accelerates the evaporation of water on the surface of the steel plate and makes the steel plate heated more evenly.

[0012] Preferably, a check valve is installed on the gas pipeline; by providing the check valve, waste water in the dust collecting hopper is prevented from flowing back into the air pump to cause damage to the equipment.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the steel plate is conveyed to the conveying mechanism after being sandblasted and polished, the water supply mechanism cleans the lower surface of the steel plate and conveys the clean water to the two groups of cleaning mechanisms, the two groups of cleaning mechanisms clean the upper surface of the steel plate, the drying mechanism cleans the water stains on the surface of the steel plate and dries the steel plate at the same time, and the exhaust mechanism extracts and purifies the exhaust gas from the paint spraying area and accelerates the evaporation of water stains on the surface of the steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model from the right side;

[0015] Figure 2 It is an axonometric structural diagram of the transmission mechanism, water delivery mechanism and air extraction mechanism of the utility model;

[0016] Figure 3 It is a schematic diagram of the cross-section axonometric structure of the water delivery mechanism and the drying mechanism of the utility model;

[0017] Figure 4 It is a partially enlarged sectional axonometric structural schematic diagram of the cleaning mechanism of the utility model.

[0018] Markings in the attached drawings: 01, conveying mechanism; 11, workbench; 12, dust cover; 13, conveying roller; 14, dust hopper; 15, sewage pipe; 16, valve; 02, water delivery mechanism; 21, motor; 22, reducer; 23, water pump; 24, connecting pipe; 25, water delivery pipe; 26, water distribution pipe 1; 27, high-pressure nozzle 1; 03, cleaning mechanism; 31, water distribution pipe 2; 32, high-pressure nozzle 2; 33, bevel gear 1; 34, rotating shaft; 35, bevel gear 2; 36, turntable; 04, drying mechanism; 41, hydraulic cylinder; 42, V-shaped wiper; 43, cleaning roller brush; 44, electric thermal resistance wire; 05, exhaust mechanism; 51, transmission shaft; 52, air pump; 53, exhaust pipeline; 54, gas pipeline. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Example 1

[0021] The utility model discloses a steel plate pretreatment line dust removal device, comprising a conveying mechanism 01; a water delivery mechanism 02, two groups of cleaning mechanisms 03, a drying mechanism 04 and an exhaust mechanism 05, wherein the water delivery mechanism 02 is installed on the conveying mechanism 01 and delivers clean water to the two groups of cleaning mechanisms 03, the two groups of cleaning mechanisms 03 are both installed on the conveying mechanism 01 and clean the steel plates, the drying mechanism 04 is installed on the conveying mechanism 01 and dries the steel plates, the exhaust mechanism 05 is installed on the water delivery mechanism 02 and exhausts the waste gas generated by spraying paint; the conveying mechanism 01 comprises a workbench 11, a dust cover 12, a plurality of conveying rollers 13, a dust collecting hopper 14, a sewage pipe 15 and a valve 16, and the working The bottom end of the table 11 is connected to the ground, the bottom end of the dust cover 12 is connected to the top of the table 11, multiple sets of conveying rollers 13 are rotatably installed on the table 11, the dust hopper 14 is installed on the table 11 and is located below the multiple sets of conveying rollers 13, the top of the sewage pipe 15 is internally connected to the bottom end of the dust hopper 14, and the valve 16 is installed on the sewage pipe 15; the water delivery mechanism 02 includes a motor 21, a reducer 22, a water pump 23, a connecting pipe 24, a water delivery pipe 25, a water distribution pipe 26 and multiple sets of high-pressure nozzles 27, the bottom end of the motor 21 is connected to the top of the dust cover 12, the bottom end of the reducer 22 is connected to the top of the dust cover 12, the bottom end of the water pump 23 is connected to the bottom of the dust cover 12 The top is connected, the connecting pipe 24 is installed on the water pump 23, the water pipe 25 is installed on the water pump 23, the water distribution pipe 26 is installed on the workbench 11 and is located below the conveying roller 13, and the water distribution pipe 26 is connected to the inside of the water distribution pipe 25, and multiple groups of high-pressure nozzles 27 are installed on the water distribution pipe 26 and are connected to the inside of the water distribution pipe 26; the cleaning mechanism 03 includes a water distribution pipe 2 31, multiple groups of high-pressure nozzles 2 32, a bevel gear 1 33, a rotating shaft 34, a bevel gear 2 35 and a turntable 36, and two groups of grooves are opened on the dust cover 12. The water distribution pipe 2 31 is rotatably installed in the groove of the dust cover 12 and is connected to the inside of the water delivery pipe 25. Multiple groups of high-pressure nozzles 2 32 are installed on the distribution pipe 2 On the water pipe 2 31, the bevel gear 1 33 is installed on the water distribution pipe 2 31, the rotating shaft 34 is rotatably installed on the dust cover 12, the bevel gear 2 35 is installed on the rotating shaft 34 and meshes with the bevel gear 1 33 for transmission, and the turntable 36 is installed on the rotating shaft 34; the drying mechanism 04 includes two groups of hydraulic cylinders 41, a V-shaped wiper 42, a cleaning roller brush 43 and three groups of electric thermal resistance wires 44, the top of the two groups of hydraulic cylinders 41 is connected to the top of the dust cover 12, the top of the V-shaped wiper 42 is connected to the bottom of the two groups of hydraulic cylinders 41, the cleaning roller brush 43 is rotatably installed on the workbench 11, two groups of electric thermal resistance wires 44 are installed on the dust cover 12, and one group of electric thermal resistance wires 44 is installed on the dust collecting hopper 14;When it is working, first, the steel plate is polished and then transported to multiple groups of conveying rollers 13. The multiple groups of conveying rollers 13 rotate to drive the steel plate to continue to be transported forward. The dust cover 12 is set to prevent the dust on the steel plate from flying and affecting the workers and the environment. The connecting pipe 24 is connected to the water source, and the motor 21 is started. The motor 21 drives the water pump 23 to pump water through the reducer 22. The water pump 23 transports the clean water to the water distribution pipe 26 through the water pipe 25. The water distribution pipe 26 distributes the clean water to multiple groups of high-pressure nozzles 27. The high-pressure nozzle 27 sprays the clean water onto the lower surface of the steel plate to clean the lower surface of the steel plate. The dust on the lower surface of the steel plate flows into the dust collecting hopper 14 with the clean water. The staff drives the rotating shaft 34 to rotate through the turntable 36. The rotating shaft 34 drives the bevel gear 2 35 to rotate. The bevel gear 2 35 and the bevel gear 1 33 are meshed for transmission. The bevel gear 1 33 drives The water distribution pipe 2 31 rotates to adjust the spray angle of the high-pressure nozzle 2 32. The water delivery pipe 25 delivers clean water to the multiple groups of high-pressure nozzles 2 32 through the water distribution pipe 2 31. The high-pressure nozzles 2 32 spray clean water onto the upper surface of the steel plate to clean the upper surface of the steel plate. The waste water from cleaning the steel plate is finally collected in the dust collecting hopper 14. After the valve 16 is opened, the waste water is discharged from the dust collecting hopper 14 through the sewage pipe 15 to prevent the accumulation of dust and blockage. Then, the two groups of hydraulic cylinders 41 push the V-shaped wiper 42 downward. The V-shaped wiper 42 and the cleaning roller brush 43 cooperate to clean the upper and lower surfaces of the steel plate. At the same time, the V-shaped wiper 42 discharges the waste water on the upper surface of the steel plate. Then, the conveying roller 13 drives the steel plate to continue to convey forward. The three groups of electric heating resistance wires 44 dry the steel plate, which not only evaporates the residual water on the surface of the steel plate, but also preheats the steel plate, which is convenient for subsequent painting of the steel plate. ;

[0022] Example 2

[0023] like Figures 1 to 4As shown, a dust removal device for a steel plate pretreatment line of the utility model is based on Example 1; the exhaust mechanism 05 includes a transmission shaft 51, an air pump 52, an exhaust pipe 53 and an air supply pipe 54, the transmission shaft 51 is rotatably mounted on the reducer 22, the bottom end of the air pump 52 is connected to the top end of the dust cover 12, the exhaust pipe 53 is mounted on the air pump 52 and is connected to the inside of the paint spraying device on the steel plate pretreatment line, the air supply pipe 54 is mounted on the air pump 52 and is connected to the inside of the dust hopper 14; it also includes a check valve installed on the air supply pipe 54; when it is working, the steel plate is first polished and then transported to multiple groups of conveying rollers 13, and the multiple groups of conveying rollers 13 rotate to drive the steel plate to continue to be transported forward, and the dust cover is set 12 To prevent the dust on the steel plate from flying and affecting the workers and the environment, the connecting pipe 24 is connected to the water source, and the motor 21 is started. The motor 21 drives the water pump 23 to pump water through the reducer 22. The water pump 23 delivers clean water to the water distribution pipe 26 through the water pipe 25. The water distribution pipe 26 distributes the clean water to multiple groups of high-pressure nozzles 27. The high-pressure nozzles 27 spray the clean water onto the lower surface of the steel plate to clean the lower surface of the steel plate. The dust on the lower surface of the steel plate flows into the dust collecting hopper 14 with the clean water. The staff drives the rotating shaft 34 to rotate through the turntable 36. The rotating shaft 34 drives the bevel gear 2 35 to rotate. The bevel gear 2 35 and the bevel gear 1 33 are meshed for transmission. The bevel gear 1 33 drives The water distribution pipe 21 is driven to rotate so as to adjust the spray angle of the high-pressure nozzle 21 32. The water delivery pipe 25 delivers clean water to the multiple groups of high-pressure nozzles 21 32 through the water distribution pipe 21. The high-pressure nozzles 21 32 spray clean water onto the upper surface of the steel plate to clean the upper surface of the steel plate. The waste water from cleaning the steel plate is finally collected in the dust collecting hopper 14. After the valve 16 is opened, the waste water is discharged from the dust collecting hopper 14 through the sewage pipe 15 to prevent the dust from clogging. Then the two groups of hydraulic cylinders 41 push the V-shaped wiper 42 downward. The V-shaped wiper 42 and the cleaning roller brush 43 cooperate to clean the upper and lower surfaces of the steel plate. At the same time, the V-shaped wiper 42 discharges the waste water on the upper surface of the steel plate. Then the conveying roller 13 drives the steel plate to continue to be conveyed forward. The three groups of electric heating wires 44 dry the steel plate, which not only evaporates the residual water on the surface of the steel plate, but also preheats the steel plate to facilitate the subsequent painting of the steel plate. The reducer 22 drives the transmission shaft 51 to rotate, and the transmission shaft 51 drives the air pump 52 to extract air. The air pump 52 extracts the exhaust gas generated during painting through the exhaust pipe 53, and then transports it to the dust hopper 14 through the air pipeline 54. The impurities in the exhaust gas are dissolved in the wastewater in the dust hopper 14, and the purified gas floats upward and is heated by the electric heating wire 44, which further accelerates the evaporation of water on the surface of the steel plate, making the steel plate heated more evenly, and by setting a check valve, the wastewater in the dust hopper 14 is prevented from flowing back into the air pump 52 to cause equipment damage.

[0024] The electric motor 21, reducer 22, water pump 23 and air pump 52 of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manuals, without the need for technicians in this field to make creative efforts.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A dust removal device for a steel plate pretreatment line, comprising a conveying mechanism (01); characterized in that: The invention also comprises a water supply mechanism (02), two groups of cleaning mechanisms (03), a drying mechanism (04) and an exhaust mechanism (05). The water supply mechanism (02) is installed on the conveying mechanism (01) and supplies clean water to the two groups of cleaning mechanisms (03). The two groups of cleaning mechanisms (03) are installed on the conveying mechanism (01) and clean the steel plates. The drying mechanism (04) is installed on the conveying mechanism (01) and dries the steel plates. The exhaust mechanism (05) is installed on the water supply mechanism (02) and exhausts the waste gas generated by spraying paint.

2. A dust removal device for a steel plate pretreatment line according to claim 1, characterized in that: The conveying mechanism (01) comprises a workbench (11), a dust cover (12), a plurality of conveying rollers (13), a dust collecting hopper (14), a sewage discharge pipe (15) and a valve (16); the bottom end of the workbench (11) is connected to the ground, the bottom end of the dust cover (12) is connected to the top end of the workbench (11), the plurality of conveying rollers (13) are rotatably mounted on the workbench (11), the dust collecting hopper (14) is mounted on the workbench (11) and is located below the plurality of conveying rollers (13), the top end of the sewage discharge pipe (15) is internally connected to the bottom end of the dust collecting hopper (14), and the valve (16) is mounted on the sewage discharge pipe (15).

3. A dust removal device for a steel plate pretreatment line as claimed in claim 2, characterized in that: The water delivery mechanism (02) comprises a motor (21), a reducer (22), a water pump (23), a connecting pipe (24), a water delivery pipe (25), a water distribution pipe (26) and a plurality of groups of high-pressure nozzles (27). The bottom end of the motor (21) is connected to the top end of the dust cover (12), the bottom end of the reducer (22) is connected to the top end of the dust cover (12), the bottom end of the water pump (23) is connected to the top end of the dust cover (12), the connecting pipe (24) is mounted on the water pump (23), the water delivery pipe (25) is mounted on the water pump (23), the water distribution pipe (26) is mounted on the workbench (11) and is located below the conveying roller (13), and the water distribution pipe (26) is connected to the inside of the water delivery pipe (25), and the plurality of groups of high-pressure nozzles (27) are all mounted on the water distribution pipe (26) and are connected to the inside of the water distribution pipe (26).

4. A dust removal device for a steel plate pretreatment line as claimed in claim 3, characterized in that: The cleaning mechanism (03) comprises a water distribution pipe (31), a plurality of high-pressure nozzles (32), a bevel gear (33), a rotating shaft (34), a bevel gear (35) and a rotating disk (36). The dust cover (12) is provided with two groups of grooves. The water distribution pipe (31) is rotatably mounted in the groove of the dust cover (12) and is communicated with the inside of the water delivery pipe (25). The plurality of high-pressure nozzles (32) are all mounted on the water distribution pipe (31). The bevel gear (33) is mounted on the water distribution pipe (31). The rotating shaft (34) is rotatably mounted on the dust cover (12). The bevel gear (35) is mounted on the rotating shaft (34) and meshes with the bevel gear (33) for transmission. The rotating disk (36) is mounted on the rotating shaft (34).

5. A dust removal device for a steel plate pretreatment line as claimed in claim 2, characterized in that: The drying mechanism (04) comprises two groups of hydraulic cylinders (41), a V-shaped water scraper (42), a cleaning roller brush (43) and three groups of electric heat resistance wires (44). The top ends of the two groups of hydraulic cylinders (41) are connected to the top ends of the dust cover (12), the top ends of the V-shaped water scraper (42) are connected to the bottom ends of the two groups of hydraulic cylinders (41), the cleaning roller brush (43) is rotatably mounted on the workbench (11), the two groups of electric heat resistance wires (44) are mounted on the dust cover (12), and one group of electric heat resistance wires (44) is mounted on the dust collecting hopper (14).

6. A dust removal device for a steel plate pretreatment line as claimed in claim 3, characterized in that: The air extraction mechanism (05) comprises a transmission shaft (51), an air pump (52), an air extraction pipeline (53) and an air supply pipeline (54); the transmission shaft (51) is rotatably mounted on the reducer (22); the bottom end of the air pump (52) is connected to the top end of the dust cover (12); the air extraction pipeline (53) is mounted on the air pump (52) and is connected to the interior of the paint spraying device on the steel plate pretreatment line; and the air supply pipeline (54) is mounted on the air pump (52) and is connected to the interior of the dust hopper (14).

7. A dust removal device for a steel plate pretreatment line according to claim 6, characterized in that: The invention also includes a check valve installed on the gas transmission pipeline (54).

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