A sludge cleaning device for the bottom of an automobile accessory electroplating wastewater comprehensive treatment tank

Abstract

The present application belongs to sewage treatment technical field, especially relate to a kind of pool bottom sludge cleaning device of automobile parts electroplating sewage comprehensive treatment pool, including treatment pool body, the treatment pool body is rectangular structure, its bottom is set as arc groove structure, the bottom of the treatment pool body is set as arc groove structure in the present application, sludge is settled under the action of gravity and automatically collected to the lowest sludge collecting groove along smooth arc surface, passive initial enrichment is realized, and favorable conditions are provided for mud scraping operation, on this basis, by setting the longitudinal section of serpentine bending mud scraping plate, first reset spring rod and hanging strip, the problem of poor adhesion of traditional scraper and hardening layer difficult to break is solved. The wave crest of serpentine bending first cuts into hardening layer to generate local high pressure, then the wave trough and subsequent wave crest cut in turn, tearing the dense sludge layer into pieces; the elastic expansion mechanism makes the mud scraping plate automatically retreat and avoid obstacles when encountering pool bottom concave-convex or hard protrusions, and then resets and adheres, avoiding jamming or missing scraping.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a device for cleaning sludge at the bottom of a comprehensive treatment tank for electroplating wastewater from automotive parts. Background Technology

[0002] In the electroplating production of automotive parts, various electroplating processes are often involved, such as zinc-nickel alloy plating, copper plating, and chromium plating. Wastewater generated from different processes is typically collected in a comprehensive wastewater treatment pond for centralized treatment. To ensure effective removal of heavy metal ions, the treatment system is usually equipped with a pH adjustment unit, an oxidation reaction unit, and a coagulation and sedimentation unit. By adding alkali, oxidants, and flocculants, heavy metal ions are converted into insoluble hydroxides or complex precipitates, which then settle to the bottom of the pond. However, the composition of automotive parts electroplating wastewater is complex, containing various complexing agents, surfactants, and oils, resulting in precipitates that are highly viscous, fine-grained, and prone to caking. After long-term operation, a large amount of dense mixed sludge layer accumulates at the bottom of the wastewater pond. This not only significantly reduces the effective volume and sedimentation efficiency of the sedimentation pond but may also clog sludge discharge pipes, jam agitators, and damage pump seals, posing a serious threat to the stable operation of subsequent treatment systems.

[0003] Currently, the main mechanical cleaning methods for sludge at the bottom of wastewater ponds include the following: First, using a bridge-type sludge scraper or chain-type sludge scraper to continuously or intermittently scrape the sludge to collect it in a sludge hopper, and then pumping it to dewatering equipment; second, using a submersible sludge suction device in conjunction with a high-pressure water flushing system to first break up the compacted sludge, and then removing it through negative pressure suction at the suction port; third, under conditions of shutdown or emptying, manually operating small excavators or high-pressure cleaning trucks to enter the pond for targeted cleaning. The above mechanical methods can complete the sludge cleaning task to a certain extent, but they show obvious limitations in the case of wastewater from electroplating of automotive parts.

[0004] The primary problem with existing mechanical cleaning technologies is the difficulty in maintaining a constant fit between the scraper blade and the bottom of the pool, resulting in incomplete cleaning and severe local residue. Specifically, the scraper blades of bridge-type scrapers or chain-type scrapers are usually rigid or semi-rigid connections. However, after long-term operation, the bottom of automotive parts electroplating wastewater pools often has uneven hardened layers, hard lumps, and local unevenness left over from the construction of the pool. When the scraper blade encounters a raised or hardened area, it will be forced to lift upwards, thus creating a suspension in the subsequent low or recessed areas, which cannot effectively contact the bottom of the pool. Conversely, if the scraper blade is forced to fit with greater pressure, it is easy to get stuck, deform, or even break at the hard lumps. Traditional bridge-type or chain-type sludge scrapers have low sludge removal efficiency in a single cleaning process due to poor adhesion between the scraper and the bottom of the pool. The residual sludge accumulates at the bottom of the pool for a long time, further aging, hardening, and thickening, forming a hard, lumpy layer that is more difficult to clean. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for cleaning sludge at the bottom of an automotive parts electroplating wastewater comprehensive treatment tank.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: This invention discloses a sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank, comprising a treatment tank body, the treatment tank body having a rectangular structure and an arc-shaped bottom; the interior of the treatment tank body is divided into an upper supernatant zone and a lower sludge settling zone along the height direction; the left and right ends of the treatment tank body are respectively connected to a waste liquid pipe for inputting automotive parts electroplating wastewater and an outlet pipe for discharging purified water; a sludge collection trough extending axially from the bottom of the treatment tank body is provided, the sludge collection trough is equipped with a rotatable screw rod; a sludge collection pipe connected to the outer wall of the treatment tank body and cooperating with an external sludge pump is installed for pumping and transporting the electroplating sludge collected inside the sludge collection trough outward; The bottom sludge scraping mechanism is installed at the top of the treatment tank body. It can reciprocate and slide relative to the inner wall of the treatment tank body and the arc-shaped bottom of the tank body. It is used to thoroughly clean the electroplating sludge attached to the inner wall of the treatment tank body and settled at the bottom of the tank. The top two sides of the treatment tank body are provided with guide structures for the reciprocating movement of the bottom sludge scraping mechanism. A driving device is used to provide power to the bottom sludge scraping mechanism, driving the bottom sludge scraping mechanism to reciprocate and slide along the bottom of the pool towards the sludge collection trough from the arc-shaped top of the treatment pool body. The high-pressure jetting assembly is installed on the bottom sludge scraping mechanism and is used to spray high-pressure liquid into the cleaning area during the cleaning operation of the bottom sludge scraping mechanism on the inner wall and bottom of the treatment tank.

[0007] Furthermore, the pool bottom sludge scraping mechanism includes: Two sludge scraper seats are arranged in an L-shape and are symmetrically positioned on the top guide structure of the treatment tank body. A movable seat is located below the horizontal end of the scraper seat; Several movable slots are arranged in a linear array at the horizontal end of the scraper seat; Several movable plates are fixedly installed on the top of the movable base, and one end of each movable plate slides through the movable groove; Several first reset spring rods, one end of which is fixedly mounted on the top of the movable plate, and the other end of which slides through the vertical end of the scraper seat; The sludge scraper has a C-shaped cross-section and a gap between its bottom end and the inner wall of the treatment tank body. A connecting plate is installed at the end of the movable seat away from the scraper seat and is positioned above the scraper plate; The hanging strip is fixedly installed below the connecting plate.

[0008] Furthermore, the longitudinal section of the scraper blade has a serpentine curved structure.

[0009] Furthermore, the driving device includes: Two arc-shaped slide rails, with an overall C-shaped structure, are symmetrically fixed on both sides of the right end of the treatment tank body; The V-shaped block is rotatably connected to the outer wall of the right end of the treatment pool body; An electric actuator, the fixed end of which is rotatably connected to the right side of the treatment tank body; Two U-shaped sliders are provided, with their two ends respectively connected to the two arc-shaped slide rails through sliding engagement, and the tops of the two connecting arms of the V-shaped block are respectively fixedly connected to the U-shaped sliders; The connecting rod is fixedly installed at the other end of the U-shaped slider; A semi-circular frame, one end of which is fixedly installed on the end of the connecting rod away from the U-shaped slider, and the other end is located on the top of the scraper seat.

[0010] Furthermore, a horizontal block is installed at the end of the semi-arc frame away from the connecting rod, and the horizontal block is slidably connected to the movable seat. Vertical blocks are installed at the left and right ends of the movable seat on the horizontal block. Second return spring rods are symmetrically arranged at the left and right ends of the horizontal block, and the end of the second return spring rod away from the horizontal block slides out of the vertical block. A drive rod is installed at the right end of the movable seat, and a ball bearing is rotatably connected at the end of the drive rod away from the movable seat. A serpentine plate is installed on the right inner wall of the treatment tank body corresponding to the position of the ball bearing. The serpentine plate has an overall C-shaped structure, and the ball bearing is tightly attached to the serpentine plate.

[0011] Furthermore, the two connecting arms of the V-block form a 90° angle at the corner, one end of the V-block is located at the top of the arc-shaped slide rail, and the other end of the V-block is located at the front end of the arc-shaped slide rail.

[0012] Furthermore, the high-pressure injection assembly includes: Two vertical tubes are respectively installed at both ends of the U-shaped slider, and their other ends are inserted into the supernatant zone inside the treatment tank body; The injection pipe is installed inside the connecting rod and the semi-circular frame and is connected to the vertical pipe; A water pump is installed in the middle of the movable base, and one end of the spray pipe passes through the transverse block, the mud scraper seat and the movable base in sequence and is fixedly connected to the water inlet of the water pump. The water pump is equipped with two water outlets. A spray plate is fixedly installed below the movable base, and multiple flow channels are opened inside it. One of the water outlets of the water pump is connected through the multiple flow channels inside the spray plate. A plurality of spray nozzles are installed at one end of the movable base near the scraper plate. Each spray nozzle is connected to the end of the corresponding flow channel, and the spray direction of the spray nozzles is set downward along the arc direction of the scraper plate.

[0013] Furthermore, each of the spray nozzles is positioned at the corner of the scraper blade.

[0014] Furthermore, the bottom end of the scraper blade is provided with multiple sets of spray holes, and another water outlet of the water pump is connected to the spray holes, and the spray directions of adjacent spray holes are arranged in a crisscross pattern.

[0015] Furthermore, the movable base is equipped with limit switches for controlling the water pump at the extreme positions of the downward sludge cleaning stroke and the upward reset stroke of the scraper. When the scraper moves downward along the inside of the treatment tank body and pushes and cleans the sludge, the limit switch corresponding to the stroke is triggered, and the water pump is powered on and started. When the scraper returns to its upward reset stroke, the limit switch corresponding to the reset stroke is triggered, and the water pump is powered off and shut down.

[0016] Compared with existing technologies, the sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to the present invention has the following advantages: 1. This invention sets the bottom of the treatment tank body into an arc-shaped trough structure, allowing the sludge to settle naturally under gravity and automatically collect along the smooth arc surface to the lowest sludge collection trough, achieving passive initial enrichment and providing favorable conditions for sludge scraping operations. Based on this, by setting a scraper with a serpentine longitudinal section, a first reset spring rod, and hanging strips, the problems of poor adhesion and difficulty in breaking up the compacted layer of traditional scrapers are solved. Crucially, these features are not simply superimposed but synergistic: the sludge layer with a specific thickness and density formed by the arc surface collection precisely matches the crest-trough spacing of the serpentine scraper. When the first reset spring rod provides a constant... When pressure is transmitted to the scraper blade, its serpentine structure can dynamically and orderly cut into the sludge layer, producing a wave-like breaking effect. Traditional straight blades or single elastic scrapers cannot create this kind of regular, alternating tearing stress, thus significantly improving the breaking efficiency of highly viscous, fibrous electroplating sludge. The serpentine wave crests first cut into the hardened layer to generate local high pressure, followed by wave troughs and subsequent wave crests cutting in sequence, tearing the dense sludge layer into pieces. The elastic telescopic mechanism allows the scraper blade to automatically retreat and avoid obstacles when it encounters unevenness or hard protrusions on the bottom of the pool, and then return to its original position to avoid jamming or missed scraping. The hanging strips at the rear further wipe away the residual thin sludge, forming a two-stage cleaning process of coarse scraping and fine scraping. The arc-shaped pool bottom and the sludge scraping mechanism work together to achieve efficient sludge collection and constant effective scraping throughout the process. The single cleaning removal rate is greatly improved, effectively preventing secondary hardening of residual sludge, restoring a smooth settling surface, increasing the effective volume and settling efficiency of the sedimentation tank, and reducing the risk of blockage and damage to pipelines, mixing devices and pump seals caused by sludge hardening, thus ensuring the long-term stable operation of the subsequent treatment system.

[0017] 2. This invention uses an electric actuator, a 90° V-block, and a C-shaped arc slide rail in the drive device to drive two scraper blades in an alternating reciprocating motion. Specifically, when one scraper blade presses down to push sludge, the other scraper blade lifts up to reset. This significantly reduces the resistance of a single push, avoiding deformation, overload, or sludge overflow caused by excessive resistance in traditional single scraper blades. At any given time, one scraper blade is always in the pushing state, achieving continuous and uninterrupted sludge transport to the collection trough. This is beneficial for the stable operation of the screw rod and external sludge pump, avoiding intermittent idling or sludge volume fluctuations, and is more critical for... The key feature is that the drive device, through the cooperation of the serpentine plate on the pool wall and the ball bearings, enables the scraper to achieve a periodic left-right offset perpendicular to the sludge pushing direction while moving back and forth. This composite motion mode of back-and-forth main motion and lateral disturbance produces a unique planing and side-shoveling effect on the structure of electroplating sludge layer with high viscosity and fibrous characteristics. It can effectively break strip-shaped hard blocks from the root. Its mechanism and effect far exceed that of simple sludge pushing. It is not a simple superposition of alternating sludge pushing and left-right offset. This design significantly reduces the drive power requirement and improves the cleaning efficiency.

[0018] 3. The high-pressure jet assembly of this invention directly draws water from the vertical pipe inserted into the supernatant zone of the pool, eliminating the need for an external water source. Importantly, the start and stop of the high-pressure jet and the stroke of the scraper achieve reliable temporal and spatial coupling. The limit switch on the moving base is only energized when the scraper moves downward to push the mud. At this time, high-pressure water is sprayed downward through the nozzle along the arc of the scraper, and a converging jet is formed by the concave corner of the serpentine bend, generating a water wedge effect to assist in breaking up hardened lumps. Simultaneously, the spray holes arranged crosswise at the bottom of the scraper generate opposing vortices in the tiny gap between the scraper and the pool bottom, peeling off the residual thin layer and forming a water pad for lubrication, significantly reducing frictional resistance. When the scraper moves upward to reset, the water pump automatically stops spraying, avoiding hydraulic disturbance of the cleaned area by the high-pressure water flow and protecting the clarity of the supernatant layer. This precise temporal and spatial coupling mechanism maximizes the effectiveness of hydraulically assisted impact under the premise of energy saving and low disturbance. The single-cycle cleaning removal rate and clarity retention effect obtained are unattainable by a simple combination of mechanical scraping and fixed, continuous high-pressure flushing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is another schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the sludge scraping mechanism at the bottom of the pool according to the present invention; Figure 4 yes Figure 3 A magnified view of part A in the image; Figure 5 This is a schematic diagram of the driving device of the present invention; Figure 6 yes Figure 3 A magnified view of part B in the image; Figure 7 yes Figure 3 A magnified view of part C; Figure 8 This is a schematic diagram of the longitudinal section of the treatment tank body of the present invention; Figure 9 This is a schematic diagram of the injection pipe of the present invention; Figure 10 This is a schematic diagram of the nozzle of the present invention.

[0020] The markings in the diagram are as follows: 1. Treatment tank body; 11. Waste liquid pipe; 12. Water outlet pipe; 13. Sludge collection tank; 14. Screw rod; 15. Sludge collection pipe; 2. Bottom sludge scraping mechanism; 21. Sludge scraper seat; 22. Movable seat; 23. Movable groove; 24. Movable plate; 25. First return spring rod; 26. Sludge scraper; 27. Connecting plate; 28. Hanging strip; 211. Horizontal block; 212. Vertical block; 213. Second return spring rod; 214. Drive rod; 215. Ball bearing; 216. Serpentine plate; 3. Drive unit; 31. Arc-shaped slide rail; 32. V-block; 33. Electric actuator; 34. U-shaped slider; 35. Connecting rod; 36. Semi-arc frame; 4. High-pressure injection assembly; 41. Vertical pipe; 42. Injection pipe; 43. Water pump; 44. Injection plate; 45. Injection nozzle; 46. Injection hole. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] See Figures 1-2 As shown, this invention provides a sludge cleaning device for the bottom of a comprehensive treatment tank for electroplating wastewater from automotive parts. The device includes a treatment tank body 1, which has a rectangular structure with an arc-shaped bottom. This arc surface smoothly transitions from the two side walls to the lowest point of the tank bottom. This structure facilitates the natural collection of sediment under gravity. The interior of the treatment tank body 1 is divided into an upper supernatant zone and a lower sludge settling zone along the height direction. Wastewater pipes 11 for inputting electroplating wastewater from automotive parts and for discharging wastewater from the left and right ends of the treatment tank body 1 are respectively connected to wastewater pipes 11 for inputting wastewater from electroplating of automotive parts and wastewater pipes 12 for discharging wastewater from the left and right ends of the treatment tank body 1. The treatment tank body 1 has an outlet pipe 12 for the purified water and a sludge collection trough 13 extending along its axial direction at the bottom. The sludge collection trough 13 is equipped with a rotatable screw rod 14. The outer wall of the treatment tank body 1 is connected to a sludge collection pipe 15 that works with an external sludge pump. This pipe is used to pump and transport the electroplating sludge collected in the sludge collection trough 13 to the outside. When the sludge is pushed into the sludge collection trough 13, the screw rod 14 rotates, forcibly transporting the sludge to the inlet end of the sludge collection pipe 15, where it is then pumped out by the external sludge pump under pressure, thus achieving the discharge and centralized treatment of the sludge. See Figures 1-4As shown, the bottom sludge scraping mechanism 2 is assembled at the top of the treatment tank body 1. It can reciprocate and slide relative to the inner wall of the treatment tank body 1 and the arc-shaped bottom of the tank. It is used to thoroughly clean the electroplating sludge adhering to the inner wall of the treatment tank body 1 and settling on the bottom of the tank. The top two sides of the treatment tank body 1 are provided with guide structures for the reciprocating movement of the bottom sludge scraping mechanism 2. The bottom sludge scraping mechanism 2 includes two scraping seats 21, which are L-shaped in shape and symmetrically arranged on the guide structure at the top of the treatment tank body 1. A movable seat 22 is set below the horizontal end of the scraping seat 21. Several movable slots 23 are linearly arrayed at the horizontal end of the scraping seat 21. Several movable plates 24 are fixedly installed on the top of the movable seat 22. One end of the moving plate 24 slides through the moving groove 23; several first reset spring rods 25, one end of which is fixedly installed on the top of the moving plate 24, and the other end of which slides through the vertical end of the scraper seat 21; the scraper plate 26 has a C-shaped cross-section, which is made of rigid material, and its bottom end has a gap with the inner wall of the treatment tank body 1; the connecting plate 27 is installed on the end of the moving seat 22 away from the scraper seat 21, and is positioned above the scraper plate 26; the hanging strip 28 is fixedly installed below the connecting plate 27; the driving device 3 is used to provide power to the bottom scraper mechanism 2, driving the bottom scraper mechanism 2 to reciprocate and slide along the bottom of the tank towards the sludge collection trough 13 from the arc-shaped top of the treatment tank body 1.

[0023] It should be noted that after the wastewater from the electroplating of automotive parts enters the treatment tank body 1 through the waste liquid pipe 11, the sludge is guided to automatically settle under gravity by the arc-shaped structure designed at the bottom of the tank and slide along the arc surface to the lowest sludge collection tank 13, thus achieving preliminary passive enrichment. When a hardened layer or hard lumps form on the bottom and inner wall of the pool, the drive device 3 is activated to drive the symmetrically arranged L-shaped sludge scraper seats 21 to reciprocate along the pool body. The hard sludge scraper plate 26 below the sludge scraper seat 21 powerfully removes and breaks up the stubborn sludge layer during the movement, and at the same time scrapes the local uneven parts left by the construction of the pool body. The hanging strip 28 that follows then wipes away the remaining thin sludge. The two form a two-stage cleaning process of coarse scraping and fine scraping. The sludge scraper seat 21 and the movable seat 22 are connected by an elastic mechanism consisting of a movable plate 24 and a first reset spring rod 25, which allows the sludge scraper 26 to automatically retreat and avoid obstacles when it encounters abnormal protrusions, and then reset and fit back together. This ensures both rigid scraping force and prevents equipment overload or damage. The sludge cleaned from the pool wall and bottom eventually flows into the sludge collection trough 13, and is forcibly pushed axially to the inlet of the sludge collection pipe 15 by the rotating spiral rod 14 inside the trough. Then, it is pressurized and pumped out by an external sludge pump to achieve fully automatic centralized treatment.

[0024] The function of the bottom sludge scraping mechanism 2 in this invention is as follows: Through a two-stage cleaning structure consisting of a rigid scraper 26 and a hanging strip 28, it first powerfully breaks down and removes the dense, hardened layer and clumps, and then cleans away the remaining thin layer of sludge, thus solving the defects of traditional scraper 26 which cannot scrape cleanly and leaves severe local residue. Simultaneously, the elastic telescopic mechanism formed between the scraper seat 21 and the movable seat 22 by the movable plate 24 and the first return spring rod 25 allows the scraper 26 to adaptively float up and down to avoid obstacles such as unevenness or hard protrusions on the bottom of the pool, and automatically return to its original position after overcoming obstacles, thus avoiding jamming caused by forced rigid contact. The scraper blades 26 and 14 are designed to prevent sludge from accumulating, deforming, or breaking, thus avoiding missed areas due to suspension after lifting. This ensures constant and effective contact between the scraper blades 26 and the bottom of the tank throughout the process, significantly improving the sludge removal efficiency of a single cleaning and preventing the residual sludge from aging and hardening into a layer of clumps that are more difficult to remove. In addition, the combination of gravity guidance from the arc-shaped bottom of the tank and forced conveying by the screw rod 14 restores a smooth settling surface to the cleaned tank bottom, increasing the effective volume and settling efficiency of the sedimentation tank. It also reduces the risk of sludge clogging the sludge discharge pipes, jamming the mixing device, and damaging the pump seals due to sludge clumps, ensuring the long-term stable operation of the subsequent treatment system.

[0025] See Figure 3 As shown, the longitudinal section of the scraper blade 26 has a serpentine curved structure.

[0026] During operation, the scraper blade 26 possesses both two-stage motion and deformation capabilities, thereby achieving dynamic contact with the pool bottom throughout the entire process. The macroscopic elastic extension stroke formed by the first reset spring rod 25 and the moving plate 24 is compressed when the entire scraper blade 26 encounters a hard protrusion, nodular blockage or excessive plate layer on the bottom of the pool, so that the entire scraper blade 26 avoids it and prevents the scraper blade or drive mechanism from being overloaded and damaged. This stroke is on the order of centimeters.

[0027] The serpentine bending structure of the scraper blade 26 provides microscopic local contouring and breaking capabilities. Under normal cleaning conditions, the first return spring rod 25 maintains its extended macroscopic stroke, applying a relatively constant downward pressure to keep the scraper blade 26 firmly attached to the bottom of the tank. At this time, the serpentine bending structure utilizes its own structural characteristics to undergo localized, elastically recovering deformation when encountering tiny millimeter-level unevenness or dense but non-rigid sludge layers on the bottom of the tank. This deformation allows its crests and troughs to dynamically and alternately adhere to and cut into the sludge layer, which is one of the core technical points of this invention. The two modes work together, with the macroscopic stroke handling large-scale obstacles and the microscopic deformation handling small-scale sludge and efficient breaking, jointly achieving full-process, dynamic, and constant effective scraping that cannot be achieved by traditional rigid scrapers or single elastic scrapers. Preferably, the scraper 26 is made of spring steel plate, composite elastic wear-resistant plate or metal material with elastic recovery capability. Its serpentine bending structure does not rely on large bending deformation of the material, but utilizes the structural flexibility formed by the crests and troughs to generate a small elastic displacement under the pre-tightening pressure applied by the first reset spring rod 25, thereby adapting to the micro-undulations of the pool bottom.

[0028] See Figure 3 and Figure 5 As shown, the drive device 3 includes two arc-shaped slide rails 31, which are C-shaped in shape and symmetrically fixed on both sides of the right end of the treatment tank body 1; a V-shaped block 32, which is rotatably connected to the outer wall of the right end of the treatment tank body 1; an electric push rod 33, whose fixed end is rotatably connected to one side of the right end of the treatment tank body 1; two U-shaped sliders 34, whose two ends are respectively connected to the two arc-shaped slide rails 31 through sliding engagement, and the tops of the two connecting arms of the V-shaped block 32 are respectively fixedly connected to the U-shaped sliders 34; a connecting rod 35, which is fixedly installed on the other end of the U-shaped sliders 34; and a semi-arc frame 36, one end of which is fixedly installed on the end of the connecting rod 35 away from the U-shaped sliders 34, and the other end is set on the top of the sludge scraper seat 21.

[0029] It should be noted that when the electric actuator 33 extends or retracts, it will push the V-shaped block 32 to rotate around its corner, thereby driving the U-shaped slider 34 to slide back and forth along the arc-shaped slide rail 31. Through the transmission of the semi-arc frame 36 and the connecting rod 35, this arc-shaped sliding is converted into a specific movement of the bottom sludge scraping mechanism 2: the two scraper seats 21 are no longer simply reciprocating horizontally, but moving horizontally while being raised and lowered, so that the front and rear scraper plates 26 alternately contact the bottom of the pool and push the sludge.

[0030] The specific timing sequence is as follows: when the electric actuator 33 retracts, the front scraper 26 pushes the sludge downwards toward the sludge collection trough 13, while the rear scraper 26 lifts upwards and resets backwards. When the electric actuator 33 extends, the front scraper 26 lifts up and the rear scraper 26 pushes the sludge down. This process is repeated, with the two scraper 26 taking turns to push the sludge continuously and in stages towards the sludge collection tank 13. If a single long-stroke scraper blade 26 is used, pushing the sludge from the bottom of the pool to the sludge collection trough 13 from the far end in one go requires overcoming huge friction and sludge accumulation pressure, which can easily lead to deformation of the scraper blade 26, drive overload or inability to push. By having two scraper blades 26 work alternately, with each blade only responsible for one stroke, that is, pushing from the middle to the sludge collection trough 13, the resistance of pushing sludge in one go is greatly reduced, so that the electric push rod 33 can complete the cleaning of the entire bottom of the pool with a smaller power. At the same time, it avoids the phenomenon that the sludge accumulates more and more in front of the scraper blade 26 and falls back to the bottom of the pool after passing the scraper blade 26. Because the two scraper blades 26 work alternately, at any given time one scraper blade 26 is always in the sludge pushing state while the other scraper blade 26 is in the reset state. This ensures that the sludge is continuously pushed to the sludge collection tank 13 without interruption of the cleaning process. The sludge conveying of this device is continuous or quasi-continuous, which is beneficial for the screw rod 14 in the sludge collection tank 13 to always have sludge to be delivered, avoiding the intermittent idling of the sludge pump or fluctuations in the amount of sludge.

[0031] It is worth noting that the bottom of the treatment tank body 1 is arc-shaped, and the movement trajectory of the scraper 26 is an approximately concentric arc, thus ensuring that the gap between the scraper 26 and the bottom of the tank is uniform. The radius of curvature of the arc-shaped slide rail 31 in this device is designed to match the arc surface of the bottom of the tank, so that the scraper 26 always contacts the bottom of the tank at the best tangential angle during the pushing process. It will not damage the bottom of the tank due to the excessive angle, nor will it slip due to the excessive angle. In addition, the length of the C-shaped arc-shaped slide rail 31 limits the maximum sludge pushing stroke of the scraper 26, preventing the scraper 26 from exceeding the sludge collection trough 13 or hitting the tank wall.

[0032] See Figure 5 As shown, the two connecting arms of the V-block 32 form a 90° angle at the corner. One end of the V-block 32 is set at the top of the arc-shaped slide rail 31, and the other end of the V-block 32 is set at the front end of the arc-shaped slide rail 31.

[0033] The two connecting arms of the V-shaped block 32 are set at 90°. Combined with the radius and installation position of the arc-shaped slide rail 31, when one scraper 26 completes its sludge pushing stroke and reaches the vicinity of the sludge collection trough 13, the other scraper 26 moves to the middle position of the maximum sludge pushing stroke in the middle of the pool, thereby ensuring effective coverage for each push and avoiding large-area missed pushes or overlapping empty pushes. The design parameter of 90° corner of V-block 32 ensures that when electric actuator 33 drives V-block 32 to swing at an angle, the displacement phase difference between the front and rear scraper blades 26 is close to 90°. As a result, when one scraper blade 26 just reaches the end of the sludge pushing and begins to lift, the other scraper blade 26 moves to the middle of the pool, rather than at the starting or ending point. This avoids blind spots where both scraper blades 26 are in ineffective positions at the same time, and also avoids material blockage or interference caused by both scraper blades 26 pressing down at the same time. This phase optimization ensures that the entire bottom of the pool is effectively covered by at least one scraper blade 26 at any time, achieving seamless relay. Moreover, a single electric actuator 33 can drive two sets of scraper blades 26 to complete complex alternating movements, simplifying the control system and reducing energy consumption.

[0034] See Figure 3 , Figure 6 and Figure 7 As shown, a horizontal block 211 is installed at the end of the semi-arc frame 36 away from the connecting rod 35, and the horizontal block 211 is connected to the movable seat 22 by a sliding fit. Vertical blocks 212 are installed at the left and right ends of the movable seat 22 located on the horizontal block 211. Second reset spring rods 213 are symmetrically arranged at the left and right ends of the horizontal block 211, and the end of the second reset spring rod 213 away from the horizontal block 211 slides out of the outside of the vertical block 212. A drive rod 214 is installed at the right end of the movable seat 22, and a ball bearing 215 is rotatably connected at the end of the drive rod 214 away from the movable seat 22. A serpentine plate 216 is installed on the right inner wall of the treatment tank body 1 corresponding to the position of the ball bearing 215. The serpentine plate 216 has an overall C-shaped structure, and the ball bearing 215 is tightly attached to the serpentine plate 216.

[0035] It should be noted that when the drive device 3 drives the entire bottom sludge scraping mechanism 2 to move alternately and reciprocally along the internal direction of the treatment tank body 1, the moving seat 22 also moves accordingly. Since the ball bearings 215 are always in close contact with the C-shaped wave profile of the serpentine plate 216, during the back-and-forth movement of the moving seat 22, the ball bearings 215 will roll along the undulating trajectory of the serpentine plate 216, thereby forcing the drive rod 214 to drive the moving seat 22 to reciprocate left and right relative to the transverse block 211. Specifically, the crests of the serpentine plate 216 push the ball bearings 215 to move left or right, which is transmitted to the moving seat 22 via the drive rod 214; and the moving seat 22... The seat 22 and the transverse block 211 are elastically constrained by the second return spring rod 213. When the moving seat 22 is pushed to one side by the serpentine plate 216, the second return spring rod 213 on that side is compressed and the other side is stretched, thereby allowing the moving seat 22 to slide left and right relative to the transverse block 211. At the same time, the spring force always keeps the ball 215 in close contact with the serpentine plate 216 to ensure follow-up. Finally, the transverse block 211 is connected to the scraper seat 21 and the scraper plate 26 through the semi-arc frame 36. Therefore, while the scraper plate 26 moves back and forth, it also obtains a periodic left and right reciprocating offset controlled by the contour of the serpentine plate 216.

[0036] This invention utilizes a scraper blade 26 that periodically shifts left and right. When the scraper blade 26 contacts the bottom of the tank, its movement trajectory is a composite trajectory of forward and backward movement and left and right shifting. This makes the force applied by the scraper blade 26 to the sludge no longer unidirectional, but rather an alternating lateral force. This effectively breaks down the adhesion interface between the sludge and the bottom of the tank, making it particularly suitable for peeling off sticky precipitates containing oils, surfactants, and complexes. It also helps to expand the effective coverage width of a single scraping and reduce blind spots in cleaning.

[0037] During the left and right offset of the scraper blade 26, the blade direction remains unchanged, and the blade only moves left and right as a whole. The composite motion trajectory formed by the offset makes the force of the scraper blade 26 on the bottom slab layer include a lateral component, which helps to pry the hard clumps from the side. Especially when the clumps extend in strips along the forward direction, the lateral force can more effectively break them from the root, producing a cleaning effect of alternating planing and side scraping.

[0038] See Figure 3 , Figure 8 and Figure 9As shown, the high-pressure jet assembly 4 is installed on the bottom sludge scraping mechanism 2 and is used to spray high-pressure liquid into the cleaning area during the cleaning operation of the bottom sludge scraping mechanism 2 on the inner wall and bottom of the treatment tank body 1. The high-pressure jet assembly 4 includes: two vertical pipes 41, which are respectively installed at both ends of the U-shaped slider 34, and their other ends are inserted into the supernatant area inside the treatment tank body 1; a jet pipe 42, which is installed inside the connecting rod 35 and the semi-arc frame 36 and is connected to the vertical pipes 41; and a water pump 43, which is installed in the middle position of the movable seat 22, and one end of the jet pipe 42 is sequentially... The water pump 43 is fixedly connected to the inlet end of the water pump 43 through the transverse block 211, the scraper seat 21, and the movable seat 22. The water pump 43 is equipped with two outlet ends. The spray plate 44 is fixedly installed below the movable seat 22 and has multiple flow grooves inside. One of the outlet ends of the water pump 43 is connected through the multiple flow grooves inside the spray plate 44. Several spray nozzles 45 are installed at one end of the movable seat 22 near the scraper 26. Each spray nozzle 45 is connected to the end of the corresponding flow groove, and the spray direction of the spray nozzle 45 is set downward along the arc direction of the scraper 26.

[0039] It should be noted that when the drive device 3 drives the sludge scraping mechanism to work and the sludge scraper 26 is pushed forward along the arc of the bottom of the pool, the vertical pipe 41 will change from a vertical posture to an inclined or nearly horizontal posture as the U-shaped slider 34 rotates. However, its inlet end extending into the supernatant zone will always remain in the supernatant below the liquid surface. After the water pump 43 starts, it will suck the supernatant through the vertical pipe 41 and the spray pipe 42, and then distribute it through the flow channel in the spray plate 44. Finally, it will be sprayed out from multiple spray nozzles 45 at high pressure and high speed. Since the direction of the spray nozzles 45 is downward along the arc of the sludge scraper 26, the sprayed high-pressure liquid jet will directly impact the sludge layer in front of the sludge scraper 26, the gap between the sludge scraper 26 and the bottom of the pool, and the surface that has just been scraped, thereby realizing the hydraulic crushing, scouring and stripping of stubborn sludge and auxiliary transportation.

[0040] While the mechanical scraping of the scraper blade 26 is effective against dense, hardened layers, it may only be able to create grooves on the surface of extremely hard or tough lumps without breaking them. The high-pressure nozzle 45 sprays downwards along the arc of the scraper blade 26, and the liquid jet impacts the hardened layer in front of the scraper blade 26 at extremely high speed, creating a water wedge effect. The high-pressure water seeps into the micro-cracks in the hardened layer, instantly generating tensile stress and causing the cracks to expand. This is equivalent to superimposing a water shock wave on top of the mechanical shearing force, which is particularly effective for hard lumps containing viscoelastic substances such as complexes and oils. The spray direction is at a certain angle to the forward direction of the scraper blade 26, so that the water flow can both impact the sludge head-on and sweep along the tangential direction of the pool bottom, washing away the broken pieces of sludge from their original position.

[0041] See Figure 10As shown, each nozzle 45 is evenly distributed at the corner of the scraper blade 26.

[0042] It should be noted that the cross-section of the scraper 26 is serpentine. The corners refer to the concave arc areas where the sludge transitions from the crest to the trough in each wave. During the advance of the scraper 26, these concave corners will naturally form sludge accumulation nodes. This is because when the sludge flows along the serpentine surface, it will be trapped and squeezed in the pits, forming corner clumps. By arranging the nozzles 45 at these positions, the design of "the place where sludge is most likely to accumulate, that is, the place where the water impact is most concentrated" is achieved. By installing the nozzles 45 inside each concave corner, the high-pressure water jet can spread and impact from inside the pit to the outside, peeling off and flushing it out as a whole. Moreover, when high-pressure water is ejected from the nozzle located at the concave corner, the water flow will flow closely along the concave wall of the serpentine surface, forming a converging wall-attached jet by utilizing the concave arc surface, which is conducive to forming a wall-attached jet and further improving the impact and cutting effect.

[0043] See Figure 10 As shown, the bottom end of the scraper blade 26 has multiple sets of spray holes 46, and the other water outlet of the water pump 43 is connected to the spray holes 46, and the spray directions of adjacent spray holes 46 are arranged in a crisscross pattern.

[0044] It should be noted that when the scraper blade 26 moves forward along the bottom of the pool under the drive of the drive device 3, high-pressure water is sprayed out from these cross-directional spray holes 46, forming a complex multi-directional jet field in the narrow gap between the scraper blade 26 and the bottom of the pool, continuously impacting and scouring the bottom surface of the pool, and peeling off the thin layer of sludge remaining after mechanical scraping, which is finally discharged with the water flow towards the sludge collection trough 13. After the mechanical scraping by the bottom scraping mechanism 2, a very thin sludge film still adheres to the bottom surface of the pool, especially highly viscous electroplating sludge. After the two jets cross each other in the direction of the adjacent spray holes 46, they collide or interfere with each other near the bottom surface of the pool, generating strong local turbulence and micro vortices. The shear direction of these vortices changes continuously in time and space, forming a multi-angle, alternating peeling force on the residual sludge, which can effectively destroy the adhesion bond between the sludge and the bottom of the pool, further enhancing the cleaning ability of the micro-uneven areas of the bottom of the pool. In this embodiment, the automatic control method of the water pump 43 is further explained. A trigger paddle (not shown) is fixedly installed on the side wall of the movable seat 22. On the right inner wall of the treatment tank body 1, a first limit switch and a second limit switch are fixedly installed respectively, corresponding to the end point of the downward sludge cleaning stroke of the scraper 26, that is, the position where the scraper 26 moves to the top of the sludge collection trough 13 and is about to be lifted, and the end point of the upward reset stroke, that is, the starting position where the scraper 26 moves to the top of the tank. The first limit switch and the second limit switch are both waterproof micro switches and are electrically connected to the control circuit of the water pump 43. When the scraper blade 26 descends to the end point for sludge removal, it triggers a lever to touch the first limit switch, closing its contacts and energizing and starting the water pump 43. After the first limit switch is triggered, the controller controls the water pump 43 to run continuously for a preset time. When the scraper blade 26 ascends to the end point, it triggers a lever to touch the second limit switch, opening its contacts and de-energizing and shutting down the water pump 43. Through the above-mentioned purely mechanical contact control, reliable linkage between the high-pressure injection component 4 and the scraper blade 26 is achieved, avoiding the risk of malfunction caused by using electronic sensors in corrosive electroplating wastewater environments.

[0045] See Figures 1-3 As shown, limit switches are provided on the movable seat 22 at the limit positions of the downward sludge cleaning stroke and the upward reset stroke of the scraper 26, respectively. The water pump 43 is electrically linked with the limit switches. When the drive device 3 drives the scraper 26 to move downward along the inside of the treatment tank body 1 and pushes and cleans the sludge, triggering the limit switch corresponding to the stroke, the water pump 43 of the high-pressure jet assembly 4 is energized and starts, continuously spraying high-pressure liquid to assist in sludge removal. When the drive device 3 drives the scraper 26 to reset upward and triggers the limit switch corresponding to the reset stroke, the water pump 43 of the high-pressure jet assembly 4 is de-energized and shuts down, stopping the high-pressure jet operation, realizing the linkage operation mode of downward spraying for sludge cleaning and upward reset to stop spraying. This invention achieves upward spray stop by limit switch, which can reduce the running time of water pump 43 by half, significantly saving energy and water resources and reducing operating costs. At the same time, since the spray medium is taken from the supernatant in the pool, no excess water is pumped out during the spray stop period, thus maintaining the stability of the liquid level in the pool. When the scraper blade 26 is reset, it is lifted and moved from near the sludge collection trough 13 toward the rear end. The high-pressure jet will generate violent local water flow disturbance. If the jet continues during the reset stroke, the disturbance will spread to the entire pool and destroy the clarification state of the supernatant zone. This is to avoid secondary disturbance of the cleaned area by the high-pressure water during the reset stroke.

[0046] Working principle: After the wastewater from electroplating of automotive parts enters the treatment tank with an arc-shaped bottom, the sludge settles under gravity and automatically collects along the arc surface to the lowest sludge collection tank 13. It is then forcibly pushed to the sludge collection pipe 15 by the spiral rod 14 inside the tank, and then pumped out by an external sludge pump. When a hardened layer forms at the bottom of the pool, the drive device 3 drives two sets of L-shaped scraper seats 21 to perform alternating reciprocating motion through the electric push rod 33, V-shaped block 32 and arc-shaped slide rail 31. When one scraper 26 presses down to push the sludge, the other lifts up to reset, and the sludge is pushed to the sludge collection tank 13 in segments, which significantly reduces the resistance of pushing the sludge in a single push. At any time, there is always a scraper 26 working to ensure continuous sludge transportation. An elastic reset spring rod is provided between the scraper seat 21 and the moving seat 22 so that the scraper 26 can automatically avoid obstacles and reset to fit when it encounters hard protrusions or pits, avoiding jamming or missed scraping. The longitudinal section of the scraper 26 is serpentine. When it moves forward, the crest first contacts the hardened layer to generate high pressure and cuts in. Then the troughs tear the sludge layer in sequence. The dynamically changing scraping angle produces a kneading and peeling effect on sticky sludge. The hanging strip 28 at the rear further wipes away the residue, forming a two-stage cleaning process of coarse scraping and fine scraping. Meanwhile, through the cooperation of the serpentine plate 216 on the pool wall and the ball bearing 215, the scraper 26 will also periodically shift left and right when it moves back and forth, so that the scraping force becomes a compound direction, expanding the cleaning width and laterally scraping hard blocks. The high-pressure jet assembly 4 uses the vertical pipe 41 inserted into the supernatant zone to draw water. The water pump 43 is linked with the limit switch: it starts when pushing mud downwards, and sprays high-pressure water through the jet nozzle 45 and the jet hole 46. The jet nozzle 45 is arranged at the concave corner of the serpentine bend to form a wall-attached jet to assist in breaking up hardened agglomerates. The jet holes 46 arranged crosswise at the bottom of the scraper 26 generate opposing vortices in the tiny gaps, peel off the residual thin layer and form a water pad for lubrication and friction reduction. When the pump is reset upwards, the water pump 43 automatically shuts off to avoid disturbing the cleaned area and save energy. Through the combination of mechanical scraping, lateral offset, high-pressure flushing and elastic obstacle avoidance, the sludge at the bottom of the pool is efficiently removed and forcibly transported, ensuring stable operation of subsequent treatment.

[0047] This application integrates an arc-shaped trough-shaped guide pool bottom, an elastic floating serpentine scraping mechanism, a dual scraper blades 26 alternating sludge pushing structure, and a high-pressure jet-assisted cleaning structure. This allows settled sludge to automatically concentrate in the collection area under gravity. Simultaneously, the scraper blades 26, with obstacle avoidance and dynamic adhesion capabilities, continuously operate close to the pool bottom, maintaining stable cleaning even when encountering hardened layers, solidified clumps, and uneven areas on the pool bottom. This avoids the reduced cleaning efficiency caused by traditional rigid scrapers due to suspended incomplete scraping, jamming deformation, or localized residue. The dual scraper blades 26... The alternating sludge pushing method further reduces the resistance of a single push, enabling the sludge to be continuously transported towards the sludge collection tank 13 without accumulation or fallback. At the same time, combined with the mechanical scraping and hydraulic stripping effects formed by high-pressure jetting, it has a stronger crushing and desorption capacity for high-viscosity electroplating sludge containing oil, complexing agents, and surfactants. This achieves deep removal and continuous discharge of sludge from the bottom of the tank, reduces problems such as decrease in the effective volume of the sedimentation tank, blockage of the sludge discharge pipeline, and equipment malfunctions, and improves the long-term stable operation and maintenance economy of the automotive parts electroplating wastewater treatment system.

[0048] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A device for cleaning sludge from the bottom of an electroplating wastewater treatment tank for automotive parts, comprising a treatment tank body (1), characterized in that... The treatment tank body (1) has a rectangular structure and its bottom is set as an arc groove structure. The interior of the treatment tank body (1) is divided into an upper supernatant zone and a lower sludge settling zone along the height direction. The left and right ends of the treatment tank body (1) are respectively connected to a waste liquid pipe (11) for inputting electroplating wastewater of automobile parts and an outlet pipe (12) for discharging purified water. The bottom of the treatment tank body (1) is provided with a sludge collection trough (13) extending along its axial direction. The sludge collection trough (13) is equipped with a rotatable screw rod (14). The outer wall of the treatment tank body (1) is connected to a sludge collection pipe (15) that cooperates with an external sludge pump for pumping and transporting the electroplating sludge collected inside the sludge collection trough (13) to the outside. The bottom sludge scraping mechanism (2) is mounted on the top of the treatment tank body (1) and can reciprocate and slide relative to the inner wall of the treatment tank body (1) and the arc-shaped bottom of the tank. It is used to clean the electroplating sludge attached to the inner wall of the treatment tank body (1) and settled on the bottom of the tank. The top two sides of the treatment tank body (1) are provided with guide structures for the bottom sludge scraping mechanism (2) to reciprocate. The driving device (3) is used to provide power to the bottom sludge scraping mechanism (2) and drive the bottom sludge scraping mechanism (2) to reciprocate and slide along the bottom of the pool towards the sludge collection trough (13) from the arc-shaped top of the treatment pool body (1). The high-pressure jetting assembly (4) is installed on the bottom sludge scraping mechanism (2) and is used to spray high-pressure liquid into the cleaning area during the cleaning operation of the bottom sludge scraping mechanism (2) on the inner wall and bottom of the treatment tank body (1).

2. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 1, characterized in that, The bottom sludge scraping mechanism (2) includes: Two sludge scraper seats (21) are arranged in an L-shape and are symmetrically arranged on the guide structure at the top of the treatment tank body (1). The movable seat (22) is located below the horizontal end of the scraper seat (21); Several movable slots (23) are arranged in a linear array at the horizontal end of the scraper seat (21); Several movable plates (24) are fixedly installed on the top of the movable base (22), and one end of the movable plate (24) slides through the movable groove (23). Several first reset spring rods (25) are fixed at one end to the top of the movable plate (24) and at the other end slide through the vertical end of the scraper seat (21); The sludge scraper (26) has a C-shaped cross-section and its bottom end has a gap with the inner wall of the treatment tank body (1). A connecting plate (27) is installed at one end of the movable seat (22) away from the scraper seat (21) and is positioned above the scraper plate (26); Hanging strip (28) is fixedly installed below the connecting plate (27).

3. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 2, characterized in that, The longitudinal section of the scraper (26) has a serpentine curved structure.

4. The device for cleaning sludge from the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 2, characterized in that, The driving device (3) includes: Two arc-shaped slide rails (31), with an overall C-shaped structure, are symmetrically fixed on both sides of the right end of the treatment pool body (1); V-shaped block (32) is rotatably connected to the outer wall of the right end of the treatment pool body (1); An electric actuator (33) has its fixed end rotatably connected to the right side of the treatment tank body (1); Two U-shaped sliders (34) are provided, and their two ends are respectively connected to the two arc-shaped slide rails (31) through sliding fit. The tops of the two connecting arms of the V-shaped block (32) are respectively fixedly connected to the U-shaped sliders (34). A connecting rod (35) is fixedly installed at the other end of the U-shaped slider (34); A semi-arc frame (36) is fixedly installed at one end of the connecting rod (35) away from the U-shaped slider (34), and the other end is located on the top of the scraper seat (21).

5. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 4, characterized in that, A horizontal block (211) is installed at one end of the semi-arc frame (36) away from the connecting rod (35), and the horizontal block (211) is slidably connected to the movable seat (22). Vertical blocks (212) are installed at the left and right ends of the horizontal block (211), and symmetrically arranged second return spring rods (213) are installed at the left and right ends of the horizontal block (211). The second return spring rods (213) are located away from the horizontal block (211). One end of 11) slides out of the outside of the vertical block (212). A drive rod (214) is installed on the right end of the movable seat (22). A ball bearing (215) is rotatably connected to the end of the drive rod (214) away from the movable seat (22). A serpentine plate (216) is installed on the right inner wall of the treatment pool body (1) corresponding to the position of the ball bearing (215). The serpentine plate (216) is C-shaped in general. The ball bearing (215) is tightly attached to the serpentine plate (216).

6. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 5, characterized in that, The two connecting arms of the V-block (32) form a 90° angle at the corner. One end of the V-block (32) is located at the top of the arc-shaped slide rail (31), and the other end of the V-block (32) is located at the front end of the arc-shaped slide rail (31).

7. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 4, characterized in that, The high-pressure injection assembly (4) includes: Two vertical tubes (41) are respectively installed at both ends of the U-shaped slider (34), and their other ends are inserted into the supernatant zone inside the treatment tank body (1); The injection pipe (42) is installed inside the connecting rod (35) and the semi-arc frame (36) and is connected to the vertical pipe (41); A water pump (43) is installed in the middle of the movable seat (22), and one end of the jet pipe (42) passes through the interior of the transverse block (211), the mud scraper seat (21) and the movable seat (22) in sequence and is fixedly connected to the water inlet end of the water pump (43). The water pump (43) is equipped with two water outlet ends. The spray plate (44) is fixedly installed below the movable seat (22), and multiple flow channels are provided inside it. One of the water outlets of the water pump (43) is connected through the multiple flow channels inside the spray plate (44). A plurality of spray nozzles (45) are mounted on one end of the movable seat (22) near the scraper (26), each spray nozzle (45) is connected to the end of the corresponding flow channel, and the spray direction of the spray nozzle (45) is set downward along the arc direction of the scraper (26).

8. The device for cleaning sludge from the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 7, characterized in that, Each of the spray nozzles (45) is located at the corner of the scraper blade (26).

9. The sludge cleaning device for the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 8, characterized in that, The bottom end of the scraper (26) has multiple sets of spray holes (46), and the other outlet end of the water pump (43) is connected to the spray holes (46), and the spray directions of adjacent spray holes (46) are arranged in a cross pattern.

10. The device for cleaning sludge from the bottom of an automotive parts electroplating wastewater comprehensive treatment tank according to claim 9, characterized in that, The movable base (22) is equipped with limit switches for controlling the water pump (43) at the extreme positions of the downward sludge cleaning stroke and the upward reset stroke of the scraper (26). When the scraper (26) moves downward along the inside of the treatment tank body (1) and pushes and cleans the sludge, the limit switch corresponding to the stroke is triggered, and the water pump (43) is powered on and started. When the scraper (26) resets upward and returns, the limit switch corresponding to the reset stroke is triggered, and the water pump (43) is de-energized and shut down.

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