Sewage anti-blocking primary treatment equipment

Abstract

The utility model provides sewage anti-blocking primary treatment equipment which comprises a pretreatment tank for sewage filtration, a water inlet communicated with a sewage inlet pipe is formed in one end of the pretreatment tank, a water outlet communicated with a sewage discharge pipe is formed in the other end of the pretreatment tank, and the diameter of the end, close to the water inlet, of the pretreatment tank is smaller than that of the end, close to the water outlet, of the pretreatment tank. According to the sewage anti-blocking primary treatment equipment, sewage penetrates through the crushing assembly and enters the sewage discharge pipe through the water outlet, the large-particle impurities in the sewage are crushed into small-particle impurities through the crushing assembly, the small-particle impurities enter the sewage discharge pipe, and the small-particle impurities enter the sewage discharge pipe; and the possibility that the sewage discharge pipe is blocked is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage blocking prevention primary treatment device. Background Art

[0002] Sewage treatment refers to the process of purifying sewage so that it meets the water quality requirements for discharge into a water body or reuse. A large amount of sewage is generated every day, whether in industrial production or residential life. In order to avoid environmental pollution caused by sewage discharge, sewage treatment plants are generally set up in various places to filter and process sewage at multiple levels to meet discharge standards.

[0003] In the process of sewage treatment, various large solid impurities often appear in the sewage. The residues after existing sewage treatment are mostly transported by sewage pumps. If they are directly transported to the sewage treatment tank for filtration, it is easy to cause blockage of the screen and equipment, making it difficult to clean. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the utility model proposes a sewage primary treatment equipment for preventing blockage, including a pretreatment tank for sewage filtration, wherein a water inlet connected to a sewage inlet pipe is provided at one end of the pretreatment tank, and a water outlet connected to a sewage discharge pipe is provided at the other end, the diameter of the pretreatment tank near the water inlet is smaller than the diameter of the pretreatment tank near the water outlet, and a crushing component is provided in the pretreatment tank near the water outlet to prevent large particles of impurities in the sewage from clogging the pipeline.

[0005] To achieve the above purpose, the sewage in the sewage entering the pipe enters the pretreatment tank through the water inlet. Since the diameter of the pretreatment tank near the water inlet is smaller than the diameter of the pretreatment tank near the water outlet, the flow rate of the sewage entering the pretreatment tank is slowed down, reducing the impact of the sewage on the crushing component and increasing the service life of the crushing component. The sewage passes through the crushing component and enters the sewage discharge pipe through the water outlet. The large particles of impurities in the sewage are crushed into small particles of impurities by the crushing component and enter the sewage discharge pipe, reducing the possibility of the sewage discharge pipe being blocked.

[0006] Furthermore, the crushing component includes a casing in a fixing device pretreatment tank, the inner cavity of the casing is hollow and opens toward one side of the water inlet, a plurality of filter holes for small particles of impurities and sewage to pass through the casing are opened on the rear side, two relatively arranged and axially arranged rotating shafts are rotatably connected to the center position of the inner cavity of the casing, a plurality of array-arranged crushing blades are fixed to the circumferential outer wall of the rotating shaft, and the crushing blades outside the two rotating shafts are close to each other and arranged alternately, inclined filter screens are fixed on both sides of the inner cavity of the casing, and each of the filter screens is located next to the crushing blade, and a driving component for driving the rotating shaft to rotate is provided on the casing.

[0007] Through the above technical scheme, the sewage flows from the water inlet toward the water outlet, and the sewage entering the casing passes through the filter hole, out of the casing and flows toward the water outlet. The driving component provides power to drive the crushing blade to rotate. The large particles of impurities in the sewage are crushed by the rotation of the crushing blade, and the crushed small particles of impurities are discharged through the filter hole. Through the action of the filter, large particles of impurities cannot enter between the filter and the crushing blade, and the filter is inclined to guide the large particles of impurities without affecting the normal flow of sewage.

[0008] Furthermore, a plurality of grooves are formed on the crushing blade, and the plurality of grooves are arranged in an array with the center line of the rotating shaft as the center of the circle.

[0009] Through the above technical solution, by setting grooves on the crushing blades, the crushing blades can push large particles of impurities during rotation. When large particles of impurities enter between the two crushing blades, they are cut and crushed by the two crushing blades, thereby improving the crushing efficiency of the device.

[0010] Further, the driving assembly includes a driving box fixed above the casing, the inner cavity of the driving box is hollow, a reducer is fixed on the driving box, the input end of the reducer is fixedly connected to the motor, the output end of the reducer is fixed to a transmission shaft, the transmission shaft passes through the driving box and is rotatably connected to the driving box, the part of the transmission shaft passing through the driving box is coaxially fixed with the adjacent rotating shaft, a driving gear located in the inner cavity of the driving box is coaxially fixed to the circumferential outer wall of the transmission shaft, a driven shaft is coaxially fixed to the other rotating shaft, one end of the driven shaft away from the rotating shaft passes through the casing and is rotatably connected to the casing, the part of the driven shaft passing through the casing passes into the inner cavity of the driving box and is rotatably connected to the inner cavity of the driving box, and a driven gear meshing with the driving gear is coaxially fixed to the circumferential outer wall of the driven shaft.

[0011] Through the above technical solution, the motor provides power to drive the transmission shaft to rotate, and the driving gear and the driven gear drive the two rotating shafts to rotate, thereby driving the crushing blades on the two rotating shafts to rotate towards each other to crush large particles of impurities.

[0012] Furthermore, a plurality of buffer components located between the casing and the water inlet are provided in the pretreatment tank.

[0013] Through the above technical solution, by arranging a buffer component at the water inlet and in the casing, the flow rate of large particles of impurities in the sewage is further slowed down, thereby reducing the possibility of large particles of impurities hitting the crushing blade and causing damage to the crushing blade, thereby increasing the service life of the device.

[0014] Furthermore, the buffer assembly includes a circular frame arranged in the pretreatment tank, and a plurality of corresponding transverse holes and axial holes are provided on the left and right sides of the circular frame. A transverse baffle bar is tightly connected in each two adjacent transverse holes in the horizontal direction, and an axial baffle bar is tightly connected in each two adjacent axial holes in the vertical direction. The transverse baffle bar is provided with a recessed groove for the axial baffle bar to pass through, and the circular frame, transverse baffle bar and axial baffle bar are fixedly connected by bolts.

[0015] Through the above technical solution, the circular frame, several transverse baffles and several axial baffles are all detachably fixedly connected by bolts, which facilitates the disassembly and assembly of the transverse baffles and the axial baffles. When one of the transverse baffles or the transverse baffles is blocked or damaged, it is convenient to disassemble, replace and clean, thereby improving the service life and use cost of the device.

[0016] Furthermore, a plurality of axially arranged ear seats are fixed to the inner groove wall of the pretreatment tank, and a mounting hole is opened on the ear seat. The ear seat is opened through the upper end of the mounting hole and the side away from the groove wall of the pretreatment tank. The two sides of the circular frame are plug-connected with adjacent ear seats through the mounting holes. The circular frame and the ear seat are fixed by bolts, and the ear seat and the groove wall of the pretreatment tank have a smooth transition in inclination.

[0017] Through the above technical solution, the ear seat and the circular frame are plug-connected and fixed by bolts to support the circular frame. Since the ear seat and the pretreatment tank wall are tilted smoothly, the possibility of the ear seat being damaged by sewage impact is reduced, thereby increasing the service life of the ear seat.

[0018] In summary, the sewage anti-blocking primary treatment equipment has the following beneficial effects:

[0019] (1) The sewage anti-blocking primary treatment equipment, the sewage in the sewage entering the sewage pipe enters the pretreatment tank through the water inlet. Since the diameter of the pretreatment tank near the water inlet is smaller than the diameter of the pretreatment tank near the water outlet, the flow rate of the sewage entering the pretreatment tank is slowed down, reducing the impact of the sewage on the crushing component and increasing the service life of the crushing component. The sewage passes through the crushing component and enters the sewage discharge pipe through the water outlet. The large particles of impurities in the sewage are crushed into small particles of impurities by the crushing component and enter the sewage discharge pipe, reducing the possibility of the sewage discharge pipe being blocked.

[0020] (2) The sewage anti-blocking primary treatment equipment further slows down the flow rate of large particles of impurities in the sewage by arranging buffer components in the water inlet and the casing, thereby reducing the possibility of large particles of impurities colliding with the crushing blade and causing damage to the crushing blade, thereby increasing the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described and elaborated below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the utility model;

[0023] Figure 2 It is a side view structural schematic diagram of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the axial retaining bar of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure of the utility model for reflecting the horizontal jack;

[0026] Figure 5 It is a schematic diagram of the structure of the crushing blade of the utility model;

[0027] Figure 6 It is a schematic diagram of the cross-sectional top view of the casing of the utility model.

[0028] Figure numerals: 1. Pretreatment tank; 101. Water inlet; 102. Water outlet; 2. Crushing assembly; 201. Casing; 202. Filter hole; 203. Rotating shaft; 204. Crushing blade; 205. Filter; 206. Groove; 3. Driving assembly; 301. Driving box; 302. Reducer; 303. Motor; 4. Buffer assembly; 401. Reciprocating frame; 402. Horizontal plug hole; 403. Axial plug hole; 404. Horizontal baffle; 405. Axial baffle; 406. Recessed groove; 5. Ear seat; 501. Mounting hole. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be more clearly and completely explained below by describing the preferred embodiments of the present invention in combination with the accompanying drawings.

[0030] like Figure 1-6 As shown, a sewage blocking prevention primary treatment device according to a preferred embodiment of the utility model comprises a pretreatment tank 1 for sewage filtration, a water inlet 101 connected to a sewage inlet pipe is provided at one end of the pretreatment tank 1, a water outlet 102 connected to a sewage discharge pipe is provided at the other end, a diameter of an end of the pretreatment tank 1 close to the water inlet 101 is smaller than a diameter of an end of the pretreatment tank 1 close to the water outlet 102, and a crushing component 2 is provided in the pretreatment tank 1 close to the water outlet 102 to prevent large particles of impurities in the sewage from blocking the pipeline.

[0031] like Figure 1 and Figure 2The sewage in the sewage entering the pipe enters the pretreatment tank 1 through the water inlet 101. Since the diameter of the end of the pretreatment tank 1 close to the water inlet 101 is smaller than the diameter of the end of the pretreatment tank 1 close to the water outlet 102, the flow rate of the sewage entering the pretreatment tank 1 is slowed down, which reduces the impact of the sewage on the crushing component 2 and increases the service life of the crushing component 2. The sewage passes through the crushing component 2 and enters the sewage discharge pipe through the water outlet 102. The sewage discharge pipe is connected to the water inlet of the sewage treatment tank. The sewage treatment tank is a prior art, so it will not be described in detail here. The large particles of impurities in the sewage are crushed into small particles of impurities through the crushing component 2 and enter the sewage discharge pipe, reducing the possibility of the sewage discharge pipe being blocked.

[0032] like Figure 1 and Figure 2 and Figure 5 and Figure 6 The crushing component 2 includes a casing 201 fixed in the pretreatment tank 1. The inner cavity of the casing 201 is hollow and opens toward the water inlet 101. A plurality of filter holes 202 for small particles of impurities and sewage to pass through the casing 201 are provided on the rear side of the casing 201. The diameter of the filter hole 202 is larger than the diameter of the impurities crushed by the crushing blades 204, so as to facilitate the passage of the crushed impurities and avoid the accumulation of the crushed impurities in the casing 201. Two rotating shafts 203 arranged oppositely and axially are rotatably connected at the center of the inner cavity of the casing 201. A plurality of crushing blades 204 arranged in an array are fixed on the circumferential outer wall of the rotating shaft 203, and the crushing blades 204 outside the two rotating shafts 203 are close to each other and arranged alternately. Inclined filter screens 205 are fixed on both sides of the inner cavity of the casing 201, and each filter screen 205 is located beside the crushing blades. A driving component 3 for driving the rotating shaft 203 to rotate is provided on the casing 201.

[0033] like Figure 1 and Figure 2 and Figure 5 and Figure 6 The sewage flows from the water inlet 101 toward the water outlet 102. The sewage entering the casing 201 passes through the filter hole 202, passes through the casing 201 and flows toward the water outlet 102. The driving component 3 provides power to drive the crushing blade 204 to rotate. The large particles of impurities in the sewage are crushed under the rotation of the crushing blade 204, and the crushed small particles of impurities are discharged through the filter hole 202. By setting a filter screen 205 that is compatible with the crushing blade 204 and the casing 201, large particles of impurities cannot enter the casing 201 from between the filter screen 205 and the crushing blade 204, and cannot flow out of the filter hole 202 to block the filter hole 202. The filter screen 205 is tilted to guide the large particles of impurities without affecting the normal flow of sewage.

[0034] like Figure 1 and Figure 2 and Figure 5 and Figure 6 In order to improve the crushing efficiency of the crushing blade 204, a plurality of grooves 206 are provided on the crushing blade 204. The plurality of grooves 206 are arranged in an array with the center line of the rotating shaft 203 as the center. The crushing blade 204 promotes large particles of impurities during rotation. When large particles of impurities enter between the two crushing blades 204, they are cut and crushed by the two crushing blades 204, thereby improving the crushing efficiency of the device.

[0035] like Figure 1 and Figure 2 and Figure 5 The driving assembly 3 includes a driving box 301 fixed on the top of the casing 201. The inner cavity of the driving box 301 is hollow. A reducer 302 is fixed on the driving box 301. The input end of the reducer 302 is fixedly connected to the motor 303. The output end of the reducer 302 is fixed to a transmission shaft, which passes through the driving box 301 and is rotatably connected to the driving box 301. The part of the transmission shaft passing through the driving box 301 is coaxially fixed with the adjacent rotating shaft 203. A driving gear located in the inner cavity of the driving box 301 is coaxially fixed to the circumferential outer wall of the transmission shaft. A driven shaft is coaxially fixed to the other rotating shaft 203. One end of the driven shaft away from the rotating shaft 203 passes through the casing 201 and is rotatably connected to the casing 201. The part of the driven shaft passing through the casing 201 passes into the inner cavity of the driving box 301 and is rotatably connected to the inner cavity of the driving box 301. A driven gear meshing with the driving gear is coaxially fixed to the circumferential outer wall of the driven shaft.

[0036] like Figure 1 and Figure 2 and Figure 5 The motor 303 provides power to drive the transmission shaft to rotate, and the two rotating shafts 203 are driven to rotate through the driving gear and the driven gear, thereby driving the crushing blades 204 on the two rotating shafts 203 to rotate towards each other to crush large particles of impurities.

[0037] like Figure 1 and Figure 2 The height of the casing 201 is higher than that of the pretreatment tank 1 to prevent sewage from affecting the motor 303.

[0038] like Figure 1 and Figure 2 and Figure 3 and Figure 4 In order to further reduce the impact of sewage on the crushing blade 204, a plurality of buffer components 4 are provided in the pretreatment tank 1 between the casing 201 and the water inlet 101. By arranging the buffer components 4 in the water inlet 101 and the casing 201, the flow speed of large particles of impurities in the sewage is further slowed down, thereby reducing the possibility of large particles of impurities hitting the crushing blade 204 and causing damage to the crushing blade 204, thereby increasing the service life of the device.

[0039] like Figure 1 and Figure 2 and Figure 3 and Figure 4 The buffer assembly 4 includes a circular frame 401 arranged in the pretreatment tank 1, and a plurality of corresponding transverse plug holes 402 and axial plug holes 403 are provided on the left and right sides of the circular frame 401. A transverse baffle 404 is tightly connected in every two adjacent transverse plug holes 402 in the horizontal direction, and an axial baffle 405 is tightly connected in every two adjacent axial plug holes 403 in the vertical direction. The transverse baffle 404 is provided with a recessed groove 406 for the axial baffle 405 to pass through. The circular frame 401, the transverse baffle 404 and the axial baffle 405 are all fixedly connected by bolts.

[0040] like Figure 1 and Figure 2 and Figure 3 and Figure 4 The circular frame 401, a plurality of transverse baffles 404 and a plurality of axial baffles 405 are all detachably fixedly connected by bolts, which facilitates the disassembly and assembly of the transverse baffles 404 and the axial baffles 405. When one of the transverse baffles 404 or the transverse baffles 404 is blocked or damaged, it is convenient to disassemble, replace and clean, thereby improving the service life and use cost of the device.

[0041] like Figure 1 and Figure 2 and Figure 3 and Figure 4 In order to install the return frame 401, a plurality of axially arranged ear seats 5 are fixed to the inner groove wall of the pretreatment tank 1, and a mounting hole 501 is opened on the ear seat 5. The ear seat 5 is opened through the upper end of the mounting hole 501 and the side away from the groove wall of the pretreatment tank 1. The two sides of the return frame 401 are plugged and connected with the adjacent ear seats 5 through the mounting holes 501. The return frame 401 and the ear seat 5 are fixed by bolts. The ear seat 5 and the groove wall of the pretreatment tank 1 are tilted and smoothly transitioned. The ear seat 5 and the return frame 401 are plugged and connected, and fixed by bolts to support the return frame 401. Since the ear seat 5 and the groove wall of the pretreatment tank 1 are tilted and smoothly transitioned, the possibility of the ear seat 5 being damaged by the impact of sewage is reduced, and the service life of the ear seat 5 is increased.

[0042] When in use, turn on the power, turn on the switch, and the sewage in the sewage pipe enters the pretreatment tank 1 through the water inlet 101 and moves toward the water outlet 102. The diameter of the pretreatment tank 1 gradually increases from the water inlet 101 end to the water outlet 102 end. Therefore, after the sewage enters the pretreatment tank 1, the flow rate slows down, reducing the impact of the sewage;

[0043] When sewage and large particles of impurities in the sewage pass through the buffer assembly 4 composed of the return frame 401, a plurality of transverse baffles 404 and a plurality of axial baffles 405, the flow rate of the sewage is further slowed down, and the impact of the sewage on the buffer assembly 4 is reduced. Since the gaps between the return frame 401, the transverse baffles 404 and the axial baffles 405 are large, the possibility of being blocked by large particles of impurities is low;

[0044] After the buffer assembly 4 composed of the return frame 401, the transverse baffle 404 and the axial baffle 405 is blocked and damaged after long-term use, the staff can remove the corresponding transverse baffle 404 and the axial baffle 405 through bolts and replace or clean them. There is no need to replace or clean the entire buffer assembly 4, which reduces the device cost;

[0045] After the sewage passes through the buffer component 4 and encounters the crushing component 2, the sewage passes through the filter screen 205 and the crushing blade 204, and passes through the filter hole 202 to pass out of the housing 201 and enter the sewage discharge pipe through the water outlet 102;

[0046] Turn on the motor 303, and provide power through the motor 303. The motor 303 will drive the transmission shaft coaxially fixed with the output end of the reducer 302 to rotate. The transmission shaft is rotatably connected with the drive box 301 and the housing 201. The rotation of the transmission shaft will drive the rotating shaft 203 fixedly connected with the transmission shaft to rotate. At the same time, the rotation of the transmission shaft will drive the driving gear fixedly connected with the transmission shaft to rotate. The rotation of the driving gear will drive the driven gear meshing with the driving gear to rotate. The rotation of the driven gear will drive the driven shaft coaxially fixed with the driven gear to rotate. The driven shaft and the driving gear are connected to the driving gear. The box 301 and the housing 201 are rotatably connected, and the rotation of the driven shaft will drive the rotating shaft 203 coaxially fixed with the driven shaft to rotate. The two rotating shafts 203 rotate towards each other, driving the crushing blades 204 coaxially fixed with the rotating shaft 203 to rotate. The crushing blades 204 rotate towards each other to crush large particles of impurities entering between the two crushing blades 204. The crushed large particles of impurities pass through the two crushing blades 204 and flow out of the housing 201 through the filter hole 202 and enter the sewage discharge pipe, thereby reducing the possibility of large particles of impurities clogging the sewage discharge pipe.

[0047] The above specific implementations are only descriptions of the preferred implementations of the utility model, and do not limit the protection scope of the utility model. Under the premise of not departing from the design concept and spirit of the utility model, various deformations, substitutions and improvements made by ordinary technicians in this field to the technical solution of the utility model based on the text description and drawings provided by the utility model should all fall within the protection scope of the utility model. The protection scope of the utility model is determined by the claims.

Claims

1. A sewage blocking prevention primary treatment equipment, characterized in that: The invention comprises a pretreatment tank (1) for sewage filtration, wherein one end of the pretreatment tank (1) is provided with a water inlet (101) connected to a sewage inlet pipe, and the other end is provided with a water outlet (102) connected to a sewage outlet pipe, the diameter of the end of the pretreatment tank (1) close to the water inlet (101) is smaller than the diameter of the end of the pretreatment tank (1) close to the water outlet (102), and the end of the pretreatment tank (1) close to the water outlet (102) is provided with a crushing component (2) for preventing large particles of impurities in the sewage from clogging the pipeline.

2. A sewage anti-blocking primary treatment equipment according to claim 1, characterized in that: The crushing assembly (2) comprises a casing (201) in a fixing device pretreatment tank (1); the casing (201) has a hollow inner cavity and is open toward one side of the water inlet (101); a plurality of filter holes (202) for small particles of impurities and sewage to pass through the casing (201) are provided on the rear side; two rotating shafts (203) arranged opposite to each other and axially arranged are rotatably connected at the center of the inner cavity of the casing (201); a plurality of crushing blades (204) arranged in an array are fixed to the circumferential outer walls of the rotating shafts (203); the crushing blades (204) outside the two rotating shafts (203) are close to each other and arranged alternately; obliquely arranged filter screens (205) are fixed on both sides of the inner cavity of the casing (201); each of the filter screens (205) is located beside a crushing blade; and a driving assembly (3) for driving the rotating shaft (203) to rotate is provided on the casing (201).

3. A sewage anti-blocking primary treatment equipment according to claim 2, characterized in that: The crushing blade (204) is provided with a plurality of grooves (206), and the plurality of grooves (206) are arranged in an array with the center line of the rotating shaft (203) as the center of the circle.

4. A sewage anti-blocking primary treatment equipment according to claim 2, characterized in that: The drive assembly (3) comprises a drive box (301) fixed on the upper part of the housing (201); the inner cavity of the drive box (301) is hollow; a reducer (302) is fixed on the drive box (301); an input end of the reducer (302) is fixedly connected to a motor (303); an output end of the reducer (302) is fixedly connected to a transmission shaft; the transmission shaft passes through the drive box (301) and is rotationally connected to the drive box (301); and a portion of the transmission shaft passing through the drive box (301) is connected to an adjacent rotation shaft (2 03) are coaxially fixed, and a driving gear located in the inner cavity of the drive box (301) is coaxially fixed on the circumferential outer wall of the transmission shaft, and a driven shaft is coaxially fixed on the other rotating shaft (203), and one end of the driven shaft away from the rotating shaft (203) passes through the housing (201) and is rotatably connected to the housing (201), and the part of the driven shaft that passes through the housing (201) passes into the inner cavity of the drive box (301) and is rotatably connected to the inner cavity of the drive box (301), and a driven gear meshing with the driving gear is coaxially fixed on the circumferential outer wall of the driven shaft.

5. The sewage anti-blocking primary treatment equipment according to claim 2 is characterized in that: The pretreatment tank (1) is provided with a plurality of buffer components (4) located between the casing (201) and the water inlet (101).

6. A sewage anti-blocking primary treatment equipment according to claim 5, characterized in that: The buffer assembly (4) comprises a circular frame (401) arranged in the pretreatment tank (1), and a plurality of one-to-one corresponding transverse plug holes (402) and axial plug holes (403) are provided on the left and right sides of the circular frame (401), and a transverse stop bar (404) is tightly inserted into each two adjacent transverse plug holes (402) in the horizontal direction, and an axial stop bar (405) is tightly inserted into each two adjacent axial plug holes (403) in the vertical direction, and a concave groove (406) is provided on the transverse stop bar (404) for the axial stop bar (405) to pass through, and the circular frame (401), the transverse stop bar (404) and the axial stop bar (405) are all fixedly connected by bolts.

7. A sewage anti-blocking primary treatment equipment according to claim 6, characterized in that: A plurality of axially arranged ear seats (5) are fixed to the inner groove wall of the pretreatment tank (1), and a mounting hole (501) is provided on the ear seat (5). The ear seat (5) is opened through the upper end of the mounting hole (501) and the side away from the groove wall of the pretreatment tank (1). The two sides of the return frame (401) are plug-connected with adjacent ear seats (5) through the mounting holes (501). The return frame (401) and the ear seat (5) are fixed by bolts, and the ear seat (5) and the groove wall of the pretreatment tank (1) are smoothly inclined.

Images