A waste gas treatment device for an electrophoretic coating production line

Abstract

The application belongs to the technical field of waste gas treatment, and particularly relates to a waste gas treatment device for an electrophoretic coating production line, which comprises a first-stage treatment tank, one end of the first-stage treatment tank is provided with an input pipe, the other end of the first-stage treatment tank is connected with a grading box through a first conveying pipe, one side of the grading box is connected with a third-stage treatment tank through a third conveying pipe, the other side of the grading box is connected with a second-stage treatment tank through a second conveying pipe, the upper parts of the second-stage treatment tank and the third-stage treatment tank are communicated through a fourth conveying pipe, and the second-stage treatment tank and the third-stage treatment tank are both connected with an output pipe for gas discharge. The device communicates the second-stage treatment tank and the third-stage treatment tank, and the waste gas can be discharged only after passing through the detection of an acid-base degree detector, and the unqualified waste gas is conveyed to another treatment tank through the fourth conveying pipe for further treatment, so that the treatment effect is effectively ensured, and the waste gas is fully treated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of waste gas treatment, and particularly relates to a waste gas treatment device for an electrophoretic coating production line. BACKGROUND

[0002] Electrophoretic coating is a coating method in which pigments and resins suspended in an electrophoretic liquid are made to migrate and deposit on the surface of a substrate of one of the electrodes by using an applied electric field. Electrophoretic coating has the characteristics of water solubility, non-toxicity, and easy automation control, and is rapidly applied in the automobile, building material, hardware, and home appliance industries. The resin contained in cathode electrophoretic paint has alkaline groups, and is dissolved in water after being neutralized by an acid to form a salt.

[0003] A waste gas treatment device for an electrophoretic coating production line is disclosed in a patent document (CN218573107U), which comprises a filter chamber and a neutralization chamber, and an alkaline solution is arranged in the neutralization chamber. The disclosed document has the effect of improving the problem that waste gas generated in the production process of the electrophoretic coating production line pollutes the environment if not treated.

[0004] During electrophoretic coating, the acidic gas generated needs to be treated in time. When the treatment is performed, the impurities in the gas often need to be removed by various treatment equipment. However, after the waste gas directly passes through one single treatment equipment, it cannot be ensured that the impurities in the gas are cleaned up, and the effect of the single equipment on the treatment of the gas is very limited. SUMMARY

[0005] Based on the technical problem in the background art that during electrophoretic coating, the acidic gas generated needs to be treated in time, and when the treatment is performed, the impurities in the gas often need to be removed by various treatment equipment, but after the waste gas directly passes through one single treatment equipment, it cannot be ensured that the impurities in the gas are cleaned up, and the effect of the single equipment on the treatment of the gas is very limited, the application provides a waste gas treatment device for an electrophoretic coating production line.

[0006] The application provides a waste gas treatment device for an electrophoretic coating production line, which comprises a first-stage treatment tank, an input pipe is arranged at one end of the first-stage treatment tank, a grading box is communicated with the other end of the first-stage treatment tank through a first conveying pipe, a third-stage treatment tank is connected to one side of the grading box through a third conveying pipe, a second-stage treatment tank is connected to the other side of the grading box through a second conveying pipe, the second-stage treatment tank and the third-stage treatment tank are communicated together through a fourth conveying pipe at the top, and output pipes for discharging gas are connected to one side of the second-stage treatment tank and the third-stage treatment tank.

[0007] Preferably, the partition frame comprises two sliding rings fixedly connected together, the sliding rings slide along the inner wall of the first-stage treatment tank, a plurality of vertical guide rods are arranged on the sliding rings, vertical grooves are formed in the surface of the guide rods, a connecting rod is fixedly connected to one side of each of the two partition frames, a sliding groove is fixedly connected to one end of the connecting rod, the back-and-forth sliding mechanism comprises a rotating disc, a first motor is fixedly installed on the surface of the first-stage treatment tank, the first motor is fixedly connected to the rotating disc through a driving end, two cylindrical limiting blocks are fixedly connected to the rotating disc, the limiting blocks are slidingly installed in the sliding groove, a plurality of horizontal rods are further fixedly connected to the two sides of the connecting rod, and a plurality of vertical rods are further fixedly connected below the horizontal rods.

[0008] Preferably, the upper end of each of the two main pipes is fixedly connected with an elbow pipe through a rotary joint, the two elbow pipes are fixedly connected to the upper end of the second-stage treatment tank and the third-stage treatment tank respectively, a plurality of spray heads are installed on the surface of each auxiliary pipe, and rotating mechanisms are arranged on the second-stage treatment tank and the third-stage treatment tank, and the rotating mechanisms are used for driving the main pipes to rotate.

[0009] Preferably, the rotating mechanism comprises a fourth gear fixedly sleeved on the rotary joint, a third gear is arranged in meshing relationship on one side of the fourth gear, the rotating mechanism further comprises a second motor, the two second motors are fixedly installed on the surface of the second-stage treatment tank and the third-stage treatment tank respectively, a first gear is fixedly connected to the driving end of the second motor, a second gear is arranged in meshing relationship on one side of the first gear, and the second gear and the third gear are fixedly connected together through a linkage shaft.

[0010] Preferably, the adjusting mechanism comprises a swing shaft movably mounted on the surface of the grading box, two ends of the swing shaft are provided with adjusting grooves, two lifting blocks are slidably arranged in the adjusting grooves, the upper ends of the two sealing plates are provided with traction plates, the two lifting blocks are rotatably connected with the two traction plates respectively, and the swing shaft swings through the cylinder.

[0011] Preferably, a connecting block is rotatably mounted at the middle position of the swing shaft, the connecting block is mounted on the surface of the grading box, one side of the swing shaft at the connecting block is provided with a protruding block, the lower end of the cylinder is movably mounted on the grading box, the driving end of the cylinder is fixedly connected with a rotating shaft, and the rotating shaft is rotatably connected with the protruding block.

[0012] Preferably, an electric spring is fixedly connected below the connecting block, and one end of the electric spring away from the swing shaft is fixedly connected on the surface of the grading box.

[0013] Preferably, a telescopic shaft is arranged in the electric spring, one end of the telescopic shaft is fixedly connected with the connecting block, and the other end of the telescopic shaft is fixedly connected with the grading box.

[0014] Preferably, the bottom of the first treatment tank is provided with a water pipe, the bottom of the second treatment tank and the third treatment tank is also provided with a water pipe, and the water pipe is used for input and output of liquid.

[0015] Preferably, a turbine is rotatably arranged in the fourth conveying pipe, and an electromagnetic valve is arranged on the fourth conveying pipe and the output pipe, and the acid-base detector detects the acid-base degree of the gas in the second treatment tank and the third treatment tank through the acid-base detection rod.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. The device is filled with alkaline treatment liquid for absorbing acidic gas in the first treatment tank, the steam in the waste gas is condensed through the block of the first treatment tank, and the acidic liquid drops are neutralized by reacting with the treatment liquid, and the internal back sliding mechanism is started to move the block back and forth, so as to accelerate the contact reaction between the treatment liquid and the waste gas, thereby improving the treatment effect of the waste gas.

[0018] 2. The device connects the second treatment tank and the third treatment tank, and the waste gas in the second treatment tank and the third treatment tank needs to pass through the detection of the acid-base detector before being discharged, and the unqualified waste gas is transported to another treatment tank through the fourth conveying pipe for further treatment, so as to effectively ensure the final treatment effect and achieve the effect of sufficient treatment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A side view structural schematic diagram of the waste gas treatment device for the electrophoretic coating production line is provided in the present application;

[0020] Figure 2 A top view structural schematic diagram of the waste gas treatment device for the electrophoretic coating production line is provided in the present application;

[0021] Figure 3 An internal structural schematic diagram of the waste gas treatment device for the electrophoretic coating production line is provided in the present application;

[0022] Figure 4 An internal structural schematic diagram of the primary treatment tank is provided in the present application;

[0023] Figure 5 An internal structural schematic diagram of the grading box is provided in the present application;

[0024] Figure 6 An internal three-dimensional structural schematic diagram of the secondary treatment tank and the tertiary treatment tank is provided in the present application;

[0025] Figure 7 An internal planar structural schematic diagram of the secondary treatment tank and the tertiary treatment tank is provided in the present application;

[0026] Figure 8 A structural schematic diagram of the rotating mechanism is provided in the present application;

[0027] Figure 9 A side view planar structural schematic diagram of the waste gas treatment device for the electrophoretic coating production line is provided in the present application;

[0028] Figure 10 A top view planar structural schematic diagram of the waste gas treatment device for the electrophoretic coating production line is provided in the present application.

[0029] In the figure: 1 primary treatment tank, 2 secondary treatment tank, 3 tertiary treatment tank, 4 grading box, 5 first conveying pipe, 6 third conveying pipe, 7 fourth conveying pipe, 8 output pipe, 9 water pipe, 10 second conveying pipe, 11 input pipe, 12 rotating disc, 13 limit block, 14 sliding groove, 15 connecting rod, 16 crossbar, 17 vertical rod, 18 guide rod, 19 slip ring, 20 first motor, 21 sealing plate, 22 swing shaft, 23 lifting block, 24 connecting block, 25 telescopic shaft, 26 electrified spring, 27 protruding block, 28 rotating shaft, 29 air cylinder, 30 traction plate, 31 main pipe, 32 auxiliary pipe, 33 spray head, 34 electromagnetic valve, 35 pH detector, 36 second motor, 37 first gear, 38 second gear, 39 third gear, 40 fourth gear, 41 rotating joint, 42 pH detection rod, 43 elbow. DETAILED DESCRIPTION

[0030] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Figures 1-10 An exhaust gas treatment device for an electrophoretic coating production line comprises a first-stage treatment tank 1, an input pipe 11 arranged at one end of the first-stage treatment tank 1, a grading box 4 communicated with the first-stage treatment tank 1 through a first conveying pipe 5 at the other end of the first-stage treatment tank 1, a third-stage treatment tank 3 connected with the grading box 4 through a third conveying pipe 6 at one side of the grading box 4, a second-stage treatment tank 2 connected with the grading box 4 through a second conveying pipe 10 at the other side of the grading box 4, the second-stage treatment tank 2 and the third-stage treatment tank 3 communicated together through a fourth conveying pipe 7 at the top of the second-stage treatment tank 2 and the third-stage treatment tank 3, and output pipes 8 for discharging gas connected with the second-stage treatment tank 2 and the third-stage treatment tank 3; acid-base detectors 35 are arranged on the ends of the two output pipes 8 close to the second-stage treatment tank 2 and the third-stage treatment tank 3; a partition frame is slidably arranged on the inner walls of the two ends of the first-stage treatment tank 1 and moves back and forth in the first-stage treatment tank 1 through a back-and-forth sliding mechanism, and the first-stage treatment tank 1 is filled with a treatment liquid; the surfaces of the ends of the second conveying pipe 10 and the third conveying pipe 6 inserted into the grading box 4 are provided with sealing plates 21, and an exchange mechanism is arranged on the grading box 4 to drive the two sealing plates 21 to move up and down; and main pipes 31 are rotatably arranged in the second-stage treatment tank 2 and the third-stage treatment tank 3, and a plurality of auxiliary pipes 32 for spraying neutralizing liquid are arranged on the two sides of the main pipes 31.

[0032] The partition frame comprises two sliding rings 19 fixedly connected together, the sliding rings 19 slide along the inner walls of the first-stage treatment tank 1, a plurality of vertical guide rods 18 are arranged on the sliding rings 19, and vertical grooves are formed in the surfaces of the guide rods 18. When the exhaust gas is conveyed into the first-stage treatment tank 1 through the input pipe 11, the acid liquid vaporized in the exhaust gas collides with the guide rods 18 to condense, and the condensed liquid flows into the treatment liquid along the vertical grooves for neutralization treatment.

[0033] The two partition frame sides facing each other are fixedly connected with connecting rods 15, one end of the connecting rod 15 is fixedly connected with a sliding groove 14, the back and forth sliding mechanism comprises a rotating disc 12, the surface of the first treatment tank 1 is fixedly installed with a first motor 20, the first motor 20 is fixedly connected with the rotating disc 12 through the driving end, two cylindrical limiting blocks 13 are fixedly connected on the rotating disc 12, and the limiting blocks 13 are slidingly installed in the sliding groove 14. The first motor 20 drives the rotating disc 12 to rotate through the driving end, the rotating disc 12 drives the limiting blocks 13 to move and change positions when rotating, the limiting blocks 13 can slide along the sliding groove 14 when moving, and the position of the sliding groove 14 is changed, the sliding groove 14 drives the partition frame to move back and forth in the first treatment tank 1 through the connecting rod 15, which can accelerate the waste gas to condense into liquid and slide down along the surface of the guide rod 18, and a plurality of horizontal rods 16 are fixedly connected on the two sides of the connecting rod 15, and a plurality of vertical rods 17 are fixedly connected below the horizontal rods 16. A plurality of vertical rods 17 are arranged on the surface of the connecting rod 15, and the plurality of vertical rods 17 can accelerate the flow rate of the waste gas and accelerate the contact between the waste gas and the treatment liquid when moving back and forth in the first treatment tank 1, thereby improving the treatment effect of the waste gas.

[0034] The upper ends of the two main pipes 31 are fixedly connected with elbow pipes 43 through rotary joints 41, the two elbow pipes 43 are fixedly connected to the upper ends of the secondary treatment tank 2 and the tertiary treatment tank 3 respectively, and a plurality of spray heads 33 are installed on the surface of each auxiliary pipe 32. The secondary treatment tank 2 and the tertiary treatment tank 3 are provided with rotating mechanisms, and the rotating mechanisms are used for driving the main pipe 31 to rotate. The waste gas treated by the first treatment tank 1 is conveyed into the secondary treatment tank 2 or the tertiary treatment tank 3, when the waste gas enters the secondary treatment tank 2 or the tertiary treatment tank 3, the rotating mechanism drives the main pipe 31 to rotate, and the main pipe 31 drives the auxiliary pipe 32 to rotate when rotating, the neutralizing liquid is conveyed into the main pipe 31 through the spray head 33, the neutralizing liquid is sprayed outwards through the spray head 33, so that the neutralizing liquid can be effectively spread in the internal space, and the flow of the internal gas is accelerated with the rotation of the rotating mechanism, so that the waste gas is more effectively contacted with the neutralizing liquid, and the treatment effect of the waste gas is improved.

[0035] The rotating mechanism comprises a fourth gear 40 fixedly sleeved on the rotary joint 41, a third gear 39 arranged in mesh on one side of the fourth gear 40, and two second motors 36 fixedly installed on surfaces of the secondary treatment tank 2 and the tertiary treatment tank 3 respectively, wherein a driving end of each second motor 36 is fixedly connected with a first gear 37, a second gear 38 is arranged in mesh on one side of the first gear 37, and the second gear 38 and the third gear 39 are fixedly connected together through a linkage shaft. The second motor 36 drives the first gear 37 to rotate through the driving end, the first gear 37 drives the meshed second gear 38 to rotate, the second gear 38 rotates synchronously with the third gear 39, the third gear 39 drives the meshed fourth gear 40 to rotate, and the fourth gear 40 drives the rotary joint 41 to rotate, so that the nozzle 33 is sealingly and rotatably connected with the main pipe 31 through the rotary joint 41, thereby realizing the rotation of the main pipe 31 under the action of the rotating mechanism.

[0036] The switching mechanism comprises a swing shaft 22 movably installed on the surface of the grading box 4, two adjusting grooves are formed at two ends of the swing shaft 22, two lifting blocks 23 are slidingly arranged in the adjusting grooves, upper ends of the two sealing plates 21 are provided with two traction plates 30, the two lifting blocks 23 are rotatably connected with the two traction plates 30 respectively, and the swing shaft 22 swings through the air cylinder 29. When the air cylinder 29 is extended and retracted, the swing shaft 22 swings, so that the two ends of the swing shaft 22 are respectively at high and low positions. The high end drives the corresponding traction plate 30 and the sealing plate 21 to move upward, so that the connected pipeline is opened. On the contrary, the low end drives the connected sealing plate 21 to be closed, the third conveying pipe 6 and the second conveying pipe 10 are used in time periods, the waste gas is effectively divided, and the working efficiency is improved.

[0037] A connecting block 24 is rotatably installed at a middle position of the swing shaft 22, the connecting block 24 is installed on the surface of the grading box 4, a protruding block 27 is arranged on one side of the swing shaft 22, the air cylinder 29 is movably installed on the grading box 4, a rotating shaft 28 is fixedly connected with a driving end of the air cylinder 29, and the rotating shaft 28 is rotatably connected with the protruding block 27. When the swing shaft 22 swings, the swing shaft 22 swings with the connecting block 24 as the center, and the swing shaft 22 swings with the connecting block 24 as the center. When the driving end of the air cylinder 29 is extended and retracted, the rotating shaft 28 drives the protruding block 27 to swing, so that the swing shaft 22 swings.

[0038] A power spring 26 is fixedly connected below the connecting block 24, and one end of the power spring 26 away from the swing shaft 22 is fixedly connected to the surface of the grading box 4. After the power spring 26 is electrified, the power spring 26 can be contracted, and after the contraction, the overall height position of the swing shaft 22 can be changed, so that the two sealing plates 21 are driven to move downward, and the ports of the third conveying pipe 6 and the second conveying pipe 10 are closed.

[0039] The telescopic shaft 25 is arranged in the energized spring 26, one end of the telescopic shaft 25 is fixedly connected with the connecting block 24, and the other end of the telescopic shaft 25 is fixedly connected with the grading box 4. The telescopic shaft 25 is arranged in the energized spring 26, which is used to keep the angle of the swing shaft 22 stable, so that the structure can be kept stable when swinging. The telescopic structure is used in cooperation with the telescopic energized spring 26.

[0040] The water pipes 9 are arranged at the bottom of the first treatment tank 1, and the water pipes 9 are also arranged at the bottom of the second treatment tank 2 and the third treatment tank 3, which are used for input and output of liquid. The treatment liquid in the first treatment tank 1 is input and output through the water pipes 9, and the neutralized liquid in the second treatment tank 2 and the third treatment tank 3 is also input and output through the connected water pipes 9.

[0041] The turbine is rotatably arranged in the fourth conveying pipe 7, and the electromagnetic valves 34 are arranged on the fourth conveying pipe 7 and the output pipe 8. The acid-base detector 35 detects the acid-base degree of the gas in the second treatment tank 2 and the third treatment tank 3 through the acid-base detection rod 42. The turbine is arranged in the fourth conveying pipe 7, and different directions of the turbine make the gas in the fourth conveying pipe 7 flow in different directions, so that the gas can flow from the second treatment tank 2 to the third treatment tank 3, or from the third treatment tank 3 to the second treatment tank 2.

[0042] The alkaline treatment liquid for absorbing acidic gas is filled in the first treatment tank 1, and the treatment liquid is in the lower part of the first treatment tank 1. The acidic waste gas generated by electrophoretic coating enters the first treatment tank 1 through the input pipe 11, is blocked by the blocking frame in the first treatment tank 1, and is condensed to make the acidic liquid droplets react and neutralize with the treatment liquid, while the internal back sliding mechanism is started to move the blocking frame back and forth in the first treatment tank 1, so as to accelerate the contact reaction between the treatment liquid and the waste gas, thereby improving the treatment effect of the waste gas.

[0043] The waste gas treated by the first treatment tank 1 enters the grading box 4 through the first conveying pipe 5, the swing shaft 22 of the switching mechanism swings, one end of the swing shaft 22 presses downward and the other end lifts up, when one end of the third conveying pipe 6 is sealed by the sealing plate 21, the other end of the second conveying pipe 10 is opened, and then the waste gas in the grading box 4 is conveyed to the second treatment tank 2 through the second conveying pipe 10 and reacts with the neutralizing liquid sprayed from the second treatment tank 2, when the second treatment tank 2 is conveyed with enough waste gas, the swing shaft 22 of the switching mechanism is turned over, one end of the second conveying pipe 10 is closed and the other end of the third conveying pipe 6 is opened, and then the waste gas in the grading box 4 is conveyed to the third treatment tank 3 through the third conveying pipe 6, and the second treatment tank 2 and the third treatment tank 3 alternately treat the waste gas.

[0044] When the waste gas is transported into the third treatment tank 3, the main pipe 31 in the second treatment tank 2 continuously rotates to spray the neutralizing liquid to continue the waste gas treatment, the output pipe 8 on one side of the second treatment tank 2 is provided with the pH detection rod 42, the treatment condition of the waste gas in the second treatment tank 2 is detected through the pH detection rod 42, when the gas treatment in the second treatment tank 2 meets the emission standard, the treated gas is discharged through the output pipe 8, on the contrary, when the gas treatment in the second treatment tank 2 does not meet the emission standard, the unqualified residual waste gas is transported into the third treatment tank 3 through the fourth transport pipe 7 to be treated again, and the treated waste gas in the third treatment tank 3 is discharged through the output pipe 8 when it is qualified, otherwise, the waste gas is transported into the second treatment tank 2 through the fourth transport pipe 7 to be treated again.

[0045] The second treatment tank 2 and the third treatment tank 3 are connected, and the waste gas in the second treatment tank 2 and the third treatment tank 3 needs to be detected by the pH detector 35 to be qualified before being discharged, the unqualified waste gas is transported to the other treatment tank through the fourth transport pipe 7 to be treated again, so that the final treatment effect is effectively ensured, and the treatment is sufficient.

[0046] The above is only the preferred embodiment of the present application, it should be noted that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An exhaust gas treatment device for an electrophoretic coating production line, characterized in that: The invention comprises a primary treatment tank (1), one end of the primary treatment tank (1) is provided with an input pipe (11), the other end of the primary treatment tank (1) is connected to a classification box (4) through a first delivery pipe (5), one side of the classification box (4) is connected to a tertiary treatment tank (3) through a third delivery pipe (6), the other side of the classification box (4) is connected to a secondary treatment tank (2) through a second delivery pipe (10), the upper parts of the secondary treatment tank (2) and the tertiary treatment tank (3) are connected together through a fourth delivery pipe (7), and one side of each of the secondary treatment tank (2) and the tertiary treatment tank (3) is connected to an output pipe (8) for gas discharge; the two output pipes (8) are close to the secondary treatment tank (2) and the tertiary treatment tank (3), and the output pipes (8) are close to the secondary treatment tank (2) and the tertiary treatment tank (3). A pH detector (35) is installed on one end of the treatment tank (3); a partition frame is slidably provided on the inner wall of both ends of the first treatment tank (1), and the partition frame moves back and forth in the first treatment tank (1) through a back-sliding mechanism, and the first treatment tank (1) is filled with treatment liquid; the second delivery pipe (10) and the third delivery pipe (6) are inserted into the classification box (4) and are provided with a sealing plate (21) on one end surface, and the classification box (4) is provided with a switching mechanism, and the switching mechanism drives the two sealing plates (21) to move up and down; the second treatment tank (2) and the third treatment tank (3) are both rotatably provided with a main pipe (31), and a plurality of nozzles for spraying neutralizing liquid are provided on both sides of the main pipe (31). Auxiliary pipe (32), the baffle frame includes two slip rings (19) fixedly connected together, the slip ring (19) slides along the inner wall of the primary treatment tank (1), a plurality of vertical guide rods (18) are provided on the slip ring (19), and a vertical groove is provided on the surface of the guide rod (18). The two baffle frames are fixedly connected to a connecting rod (15) on the sides facing each other, and one end of the connecting rod (15) is fixedly connected to a slide groove (14). The back-sliding mechanism includes a turntable (12), and a first motor (20) is fixedly installed on the surface of the primary treatment tank (1), and the first motor (20) is fixedly connected to the turntable (12) through the driving end. Two cylindrical limit blocks (13) are connected, and the limit blocks (13) are slidably installed in the slide groove (14). A plurality of cross bars (16) are fixedly connected to both sides of the connecting rod (15), and a plurality of vertical bars (17) are fixedly connected to the bottom of the cross bars (16). The upper ends of the two main pipes (31) are fixedly connected to the bent pipes (43) through the rotating joints (41). The two bent pipes (43) are respectively fixedly connected to the upper ends of the secondary treatment tank (2) and the tertiary treatment tank (3). A plurality of nozzles (33) are installed on the surface of each auxiliary pipe (32). The secondary treatment tank (2) and the tertiary treatment tank (3) are both provided with a rotating mechanism, and the rotating mechanism is used to drive the main pipe (31) to rotate.

2. The exhaust gas treatment device for an electrophoretic coating production line according to claim 1, characterized in that: The rotating mechanism comprises a fourth gear (40) fixedly sleeved on a rotary joint (41), a third gear (39) being meshed with one side of the fourth gear (40), and the rotating mechanism further comprises a second motor (36), two second motors (36) being fixedly mounted on the surface of the secondary treatment tank (2) and the tertiary treatment tank (3), respectively, a driving end of the second motor (36) being fixedly connected to a first gear (37), a second gear (38) being meshed with one side of the first gear (37), and the second gear (38) and the third gear (39) being fixedly connected together via a linkage shaft.

3. The exhaust gas treatment device for an electrophoretic coating production line according to claim 1, characterized in that: The switching mechanism includes a swing shaft (22) movably mounted on the surface of the grading box (4), with adjustment grooves provided at both ends of the swing shaft (22), lifting blocks (23) slidably provided in the two adjustment grooves, a traction plate (30) provided at the upper ends of the two sealing plates (21), the two lifting blocks (23) being rotatably connected to the two traction plates (30) respectively, and the swing shaft (22) being swung by a cylinder (29).

4. The exhaust gas treatment device for an electrophoretic coating production line according to claim 3, characterized in that: A connecting block (24) is rotatably mounted on the middle section of the swing shaft (22), and the connecting block (24) is mounted on the surface of the grading box (4). A protrusion (27) is provided on one side of the connecting block (24) on the swing shaft (22). The lower end of the cylinder (29) is movably mounted on the grading box (4), and a rotating shaft (28) is fixedly connected to the driving end of the cylinder (29), and the rotating shaft (28) is rotatably connected to the protrusion (27).

5. The exhaust gas treatment device for an electrophoretic coating production line according to claim 4, characterized in that: An energizing spring (26) is fixedly connected below the connecting block (24), and one end of the energizing spring (26) away from the swing shaft (22) is fixedly connected to the surface of the grading box (4).

6. The exhaust gas treatment device for an electrophoretic coating production line according to claim 5, characterized in that: A telescopic shaft (25) is provided in the energized spring (26), one end of the telescopic shaft (25) is fixedly connected to the connecting block (24), and the other end of the telescopic shaft (25) is fixedly connected to the grading box (4).

7. The exhaust gas treatment device for an electrophoretic coating production line according to claim 1, characterized in that: A water pipe (9) is provided at the bottom of the primary treatment tank (1), and water pipes (9) are also provided at the bottoms of the secondary treatment tank (2) and the tertiary treatment tank (3). The water pipes (9) are used for input and output of liquid.

8. The exhaust gas treatment device for an electrophoretic coating production line according to claim 1, characterized in that: A turbine is rotatably installed in the fourth delivery pipe (7), and electromagnetic valves (34) are installed on the fourth delivery pipe (7) and the output pipe (8). The pH detector (35) detects the pH of the gas in the secondary treatment tank (2) and the tertiary treatment tank (3) through the pH detection rod (42).

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