Automatic suction device for sludge in a disinfection tank

Abstract

The utility model relates to sewage treatment technical field discloses a kind of automatic suction of disinfection pool mud device, including the suction of mud component that reciprocating walks on disinfection pool body, suction of mud component includes suction of mud pump, truss component and the mud scraping frame connected to the bottom of truss component, the bottom of mud scraping frame is closely attached to the bottom wall surface of disinfection pool body, and mud scraping frame and the bottom wall surface of disinfection pool body form the cavity of sludge collection between, the inlet end of suction of mud pump is communicated with cavity, continuously discharge sludge in cavity;The utility model passes through the suction of mud component that reciprocating walks on disinfection pool body, to form the cavity of sludge collection at the bottom of disinfection pool body, so that sludge is more concentratedly sucked, reaches good adsorption effect, simultaneously, through the suction of mud component that reciprocating walks, underwater sludge removal can also be executed under normal operating condition of disinfection pool, disinfection pool is not empty again, improve work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an automatic sludge suction device for a disinfection tank. Background Art

[0002] In conventional process design, the front end of the contact disinfection tank is usually equipped with a high-density tank or a filter cloth filter tank for pretreating the effluent from the secondary sedimentation tank. However, due to the limited interception capacity of the high-density tank and the filter cloth filter tank for suspended solids in the wastewater, complete removal cannot be achieved. As a result, during the long-term operation of the contact disinfection tank, the un-intercepted suspended solids are continuously deposited at the bottom of the tank, forming sludge accumulation, which further affects the final effluent quality.

[0003] At present, sewage treatment plants mainly adopt two methods for desilting contact disinfection tanks: First, after switching the inlet water to a bypass to interrupt the treatment process, personnel enter the tank for manual desilting. This method not only requires the normal operation of the disinfection tank to be suspended, affecting the continuity of wastewater treatment, but also easily leads to safety accidents due to the possible presence of toxic gases (such as residual chlorine) in the tank and confined space operation risks when personnel work inside the tank. Meanwhile, the desilting process is time-consuming, labor-intensive and inefficient. Second, some sewage plants install spray washing devices on the top of the contact disinfection tank. Although this can replace part of the manual operations, it is still necessary to switch the inlet water to the bypass, making continuous operation impossible. In addition, the spray method has a limited removal effect on the sludge deposited at the bottom of the tank, and manual assistance is still required to clean the residual sludge, resulting in incomplete desilting, difficulty in avoiding the risk of effluent quality exceeding standards, and safety hazards still exist in the manual assistance link.

[0004] In view of the problems of the existing desilting methods, such as operation interruption, high safety risk, low efficiency, incomplete desilting and water quality risk, the present invention aims to realize real-time and continuous removal of sludge at the bottom of the contact disinfection tank, avoid interference of the desilting process on the treatment flow, and reduce environmental protection and safety risks. Contents of the Invention

[0005] The purpose of the utility model is to provide an automatic sludge suction device for a disinfection tank. Through the sludge suction assembly that reciprocates on the disinfection tank body, a cavity for collecting sludge is formed at the bottom of the disinfection tank body, so that the sludge can be sucked away in a more concentrated manner, achieving a good adsorption effect. At the same time, the reciprocating sludge suction assembly can also perform underwater sediment removal during the normal operation of the disinfection tank, without emptying the disinfection tank, which improves the working efficiency. In addition, no personnel are arranged to enter the tank for further desilting work, which also reduces the work burden, and lowers the manual input cost of the enterprise and the safety risk of personnel operation.

[0006] The utility model is realized through the following technical solution: An automatic sludge suction device for a disinfection tank comprises a sludge suction assembly that reciprocates on the disinfection tank body, wherein the sludge suction assembly comprises a sludge suction pump, a truss assembly, and a mud scraping frame connected to the bottom of the truss assembly; The bottom of the sludge scraper is in close contact with the bottom wall of the disinfection tank body, and a sludge collection cavity is formed between the sludge scraper and the bottom wall of the disinfection tank body. The inlet end of the sludge suction pump is connected to the cavity to continuously discharge the sludge from the cavity.

[0007] In this solution, the sludge collection cavity formed by the scraper and the bottom wall of the disinfection tank can forcibly collect the suspended sludge dispersed and deposited at the bottom of the tank, effectively preventing the sludge from spreading with the water flow. This ensures that the sludge can be accurately and continuously discharged after the sludge suction pump inlet is connected to the cavity, significantly improving the thoroughness of sludge removal. This solves the problem that traditional spray flushing can only remove surface sludge and requires manual cleaning of residues. At the same time, the sludge suction component can move back and forth along the body of the disinfection tank without switching the inlet water to a bypass or emptying the tank. It can simultaneously complete the sludge removal process while the disinfection tank is carrying out normal sewage treatment and disinfection operations. The dredging process ensures the continuity of the wastewater treatment process and avoids the drawbacks of traditional manual dredging, which requires interruption of operation. In addition, the entire dredging process relies on the automatic movement of the sludge suction components and the continuous operation of the sludge suction pump, eliminating the need for personnel to enter the confined space of the tank. This completely eliminates the safety risks of manual contact with potentially residual toxic gases (such as chlorine) in the tank, reducing the workload of staff, lowering the labor input costs for enterprises, and avoiding the risk of effluent water quality exceeding standards due to untimely or incomplete manual cleaning. This achieves high efficiency, automation, and safety in disinfection tank dredging.

[0008] As a further embodiment of the sludge suction device, the sludge suction assembly includes a walking assembly, which includes rollers, a support frame, and a drive assembly; The support frames are arranged in pairs on both sides of the truss assembly. The rollers are connected to the end of each support frame, and each roller is connected to the output end of the drive assembly. The drive assembly drives the rollers to move along the guide rail on the disinfection tank body. In this way, on the one hand, it replaces the traditional method of manually pushing or carrying the sludge removal equipment, which greatly reduces the intensity of manual labor and reduces the cost of manual operation. On the other hand, the guiding effect of the guide rail can strictly limit the movement path of the rollers, prevent the sludge suction assembly from deviating during movement, and ensure that the sludge suction assembly can fully cover the length of the disinfection tank without missing any sludge removal area.

[0009] As a further embodiment of the sludge suction device, the walking component also includes a limit switch. The limit switch is connected to the support frame and located in the direction of movement of the sludge suction component. The limit switch is also electrically connected to the drive component. When the sludge suction component moves along the guide rail of the disinfection tank body towards one end of the tank body under the drive component, until the limit switch touches the end of the tank body or the preset limit structure, the limit switch will immediately transmit an electrical signal to the drive component, triggering the drive component to change its running direction, thereby driving the sludge suction component to automatically turn and move towards the other end of the tank body. The entire reversing process does not require manual monitoring and operation, eliminating the dependence on manual intervention for reversing in traditional sludge removal methods. It realizes unattended reciprocating sludge removal along the length of the disinfection tank by the sludge suction component, greatly reducing the cost of manual management.

[0010] As a further embodiment of the sludge suction device, the truss assembly includes an upper truss and a connecting frame. One end of the connecting frame is connected to the upper truss, and the other end of the connecting frame is connected to the sludge scraper. A reinforcing rod is connected to the outer diagonal direction of the connecting frame. By utilizing the mechanical characteristics of diagonal support, the torsional resistance and overall structural strength of the connecting frame are significantly enhanced, which can effectively resist the lateral impact force generated when the sludge suction assembly moves along the guide rail.

[0011] As a further embodiment of the sludge suction device, the sludge scraper includes a cover plate and a scraper plate. The scraper plate is arranged in an X-shape at the bottom of the truss assembly, forming a gradually expanding structure. During the movement of the sludge suction assembly, it can gradually gather the sludge from both sides towards the center of the disinfection tank. Compared with the traditional sludge scraping structure with a single direction or fixed range, this significantly expands the coverage area of ​​a single scraping. The cover plate covers the upper part of the gradually expanding structure to form the cavity, which can stably confine the sludge guided by the scraper plate within the cavity, preventing the sludge from spreading with the water flow in the disinfection tank before being adsorbed. This solves the problem of incomplete adsorption and some sludge residue at the bottom of the tank caused by the dispersion of sludge in traditional sludge removal. The inlet end of the sludge suction pump is connected to the central cavity of the gradually expanding structure. Utilizing the concentrated suction advantage at the central position, the sludge collected in the cavity is efficiently and centrally adsorbed and discharged, avoiding the accumulation of sludge in some areas due to the dispersion of adsorption points, and further improving the sludge adsorption efficiency.

[0012] As a further solution to the sludge suction device, in order to further improve the sludge adsorption efficiency, multiple sets of scraper frames are provided, all of which are close to the bottom of the truss assembly.

[0013] As a further embodiment of the sludge suction device, the inner wall of the scraper is provided with a slope, which can efficiently guide the sludge scraped to the inner side of the scraper, guiding the dispersed sludge into the cavity of the scraper frame. This ensures that the scraped sludge is quickly and centrally gathered into the core adsorption area corresponding to the inlet end of the sludge suction pump, improving the sludge gathering efficiency into the cavity and avoiding the situation of vacuum suction or uneven adsorption caused by the sludge being dispersed inside the scraper.

[0014] As a further improvement to the sludge suction device, to further enhance the continuity and thoroughness of dredging, the inclination angle of the slope is 45° to 60°.

[0015] As a further embodiment of the sludge suction device, an arc plate is connected between adjacent scraper blades. The arc plate is tangent to the slope, creating a smooth transition path from the slope to the arc plate. The scraped sludge can smoothly slide along the slope to the surface of the arc plate, and then flow continuously towards the center of the sludge scraper's cavity through the arc-shaped guide of the arc plate. There is no jamming or stagnation throughout the process, which improves the sludge collection efficiency and ensures that each scraped sludge can be accurately and quickly collected into the core area of ​​the cavity.

[0016] As a further embodiment of the sludge suction device, the sludge scraper also includes a sludge suction plate. The sludge inlet at the bottom of the sludge suction plate is divided into several small compartments. Each small compartment has an independent channel connected to the inlet of the sludge suction pump. The independent channel can ensure that the sludge suction pressure of each small compartment is stable, avoid suction loss caused by sharing the channel, and further improve the sludge suction efficiency.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. This utility model can move smoothly along the guide rail on the body of the disinfection tank through the sludge suction component, and simultaneously complete the sludge removal while the disinfection tank is normally filled with water and the disinfection operation is carried out. There is no need to empty the tank or interrupt the treatment process, which effectively ensures the continuity of sewage treatment and avoids the interruption of effluent supply or water quality fluctuations caused by sludge removal. 2. This utility model achieves fully automatic reciprocating movement of the sludge suction component through the linkage of the limit switch and the drive component. No human intervention is required throughout the process, and no personnel are required to enter the pool to work. This eliminates the risk of working in confined spaces and contact with toxic gases, while reducing the workload of workers and lowering the company's labor management costs and safety accident prevention costs. 3. The sludge scraper of this utility model adopts an X-shaped gradually expanding scraper plate and cover cavity design, which can force the dispersed sludge at the bottom of the pool to gather into the central cavity. The inner slope of the scraper plate guides the sludge to slide smoothly into the cavity. The tangential arc plate between adjacent scraper plates eliminates dead corners in sludge removal. Multiple sets of closely adjacent scraper frames expand the coverage area. Combined with the compartmentalized independent channel design of the sludge suction plate, it can not only avoid the spread of sludge, but also ensure that the sludge in each area of ​​the cavity is evenly adsorbed, with no residue and no blind spots. It solves the problems of incomplete surface cleaning and local residue accumulation in traditional sludge removal, and effectively reduces the risk of the effluent water quality exceeding the standard. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a structural diagram of the present invention in use. Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 for Figure 2 A schematic diagram of the structure marked A in the middle; Figure 4 This is a bottom view of the structure of this utility model; Figure 5 This is a schematic diagram of the rear view structure of this utility model; Figure 6 This is a structural schematic diagram from another perspective of the present invention; Figure 7 for Figure 6 A schematic diagram of the structure marked B.

[0019] The attached diagram shows the markings and corresponding component names: 1-Disinfection tank body, 2-Guide rail, 3-Sludge suction assembly, 30-Walking assembly, 301-Limit switch, 302-Roller, 303-Support frame, 304-Drive assembly, 31-First pipe, 311-Second pipe, 32-Water inlet tank, 33-Sludge suction pump, 34-Sludge discharge pipe, 35-Connecting frame, 36-Reinforcing rod, 37-Sludge scraper, 371-Cover plate, 372-Sludge suction disc, 373-Sludge scraper, 374-Arc plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model. Example

[0021] This embodiment 1 provides an automatic sludge suction device for a disinfection tank, such as... Figures 1-2 As shown, the sludge suction assembly 3 reciprocates on the disinfection tank body 1. The sludge suction assembly 3 includes a sludge suction pump 33, a truss assembly, and a scraper frame 37 connected to the bottom of the truss assembly. Specifically, the truss assembly includes an upper truss, a lower truss, and a connecting frame 35. The two ends of the connecting frame 35 are respectively connected to the upper and lower trusses. The two ends of the upper truss are mounted on the upper surface of the disinfection tank body 1 via the traveling assembly 30. In this embodiment, two parallel strip guide rails 2 are laid on the upper surface of the disinfection tank body 1, extending along the length of the disinfection tank body 1 along both sides of the top edge of the tank. Figure 3 As shown, the walking assembly 30 includes rollers 302, support frames 303, and drive assembly 304. The support frames 303 are made of stainless steel square tubes and are welded in two pairs, symmetrically welded to the ends of the upper truss. One end of the support frame 303 is fixedly connected to the upper truss, and the other end is connected to the rollers 302 through bearings. The entire support frame 303 bears the weight of the truss assembly, the scraper frame 37, and the suction pump 33. The drive assembly 304 is a geared motor, which is fixed to the outside of the upper truss with bolts. The output shaft is connected to the rollers 302 through a coupling. The transmission gear meshes with the axle of the rollers 302, providing continuous power to the rollers 302, replacing manual pushing, and realizing the automated movement of the suction assembly 3. In some embodiments, the speed regulation function of the geared motor can also match different sludge removal needs, ensuring that the scraper frame 37 has enough time to scrape and collect sludge, while avoiding sludge diffusion due to excessive movement.

[0022] Meanwhile, the walking component 30 also includes limit switches 301, which are normally closed mechanical limit switches. There are two pairs, which are symmetrically installed at the front and rear ends of the sludge suction component 3 in the direction of movement (i.e., the outer ends of the support frame 303). They are electrically connected to the drive component 304 through wires, with the trigger face facing the two ends of the disinfection tank body 1. When the sludge suction component 3 moves to the end of the disinfection tank body 1, the limit switch 301 contacts the tank wall and is triggered, sending a reverse running signal to the drive component 304. The drive component 304 then drives the roller 302 to rotate in the opposite direction, realizing the fully automatic reversal of the sludge suction component 3. There is no need for manual operation to start, stop or turn, avoiding the sludge suction component 3 from colliding with the tank wall due to overtravel, while ensuring that the sludge removal covers the entire length of the disinfection tank.

[0023] In this embodiment, the upper truss is made of stainless steel square tubes welded into a rectangular frame, the length of which is adapted to the width of the disinfection tank body 1; the top of the upper truss is fixed with the water tank 32 and the sludge pump 33 by bolts, and the bottom is welded with a connecting frame 35; the connecting frame 35 is made of four stainless steel round tubes, which are distributed vertically, and the upper end of each connecting frame 35 is welded to the bottom of the upper truss and the lower end is welded to the lower truss; at the same time, a reinforcing rod 36 is also provided along the outer diagonal direction of the connecting frame 35; one end of each reinforcing rod 36 is welded to the upper end of the connecting frame 35, and the other end is welded to the lower end of the adjacent connecting frame 35. By utilizing the mechanical characteristics of diagonal support, the torsional performance and overall structural strength of the connecting frame 35 are enhanced.

[0024] In this embodiment, the sludge pump 33 is a horizontal centrifugal pump, which is fixed to the top of the upper truss by bolts. The sludge pump 33 provides negative pressure suction to suck up the sludge in the cavity and then pressurizes and transports it to the sludge discharge pipe 34 to achieve continuous discharge of sludge. The water tank 32 is a stainless steel cylindrical container, which is fixed to the top of the upper truss by a bracket and located next to the sludge pump 33. One side of the water tank 32 is connected to the first pipe 31, and the other side is connected to the inlet end of the sludge pump (33). The top of the water tank 32 is provided with a water inlet and an exhaust valve. Before the sludge pump (33) is started, clean water is injected into the water tank 32 to ensure that the sludge pump 33 can form negative pressure when it starts, so as to avoid sludge suction failure caused by dry running.

[0025] Among them, such as Figures 4-7 As shown, to further improve sludge adsorption efficiency, multiple sets of the aforementioned sludge scraper 37 are provided, all adjacent to the bottom of the lower truss. The sludge scraper 37 uses a unique structure to force the dispersed sludge at the bottom of the pool to be collected into the cavity, providing conditions for concentrated adsorption by the sludge suction pump 33. Specifically, the sludge scraper 37 includes a cover plate 371 and a scraper plate 373. The scraper plate 373 is arranged in an X shape at the bottom of the lower truss, forming a gradually expanding structure. During the movement of the sludge suction assembly, it can gradually gather the sludge from both sides to the center of the disinfection pool bottom wall. The cover plate 371 covers the upper part of the gradually expanding structure to form a cavity, which can stably confine the sludge guided by the scraper plate 373 within the cavity. The inlet end of the sludge suction pump 33 is connected to the middle cavity of the gradually expanding structure through a second pipe 311. Utilizing the concentrated suction advantage at the center position, the sludge collected in the cavity is adsorbed efficiently and in a concentrated manner.

[0026] In this embodiment, the scraper blades 373 are made of stainless steel plates, and there are four of them, which are welded to the bottom of the cover plate 371 in an X shape. The four scraper blades 373 converge at the middle and extend radially in all directions to form a gradually expanding structure (the width gradually increases from the center to the edge). The inner sidewall of the scraper blades 373 is processed with a slope (inclination angle of 45° to 60°), and the bottom edge is in contact with the bottom wall of the disinfection tank body 1 (a 1mm gap can be reserved to avoid scratching the bottom of the tank). The gradually expanding structure can scrape sludge from the periphery to the center when the sludge suction assembly 3 moves, thereby expanding the coverage area of ​​a single scraping. The slope of the inner sidewall can guide the sludge to slide along the slope to the center of the cavity (the inlet end of the sludge suction pump 33), avoiding the accumulation of sludge on the inner side of the scraper blades 373.

[0027] In other embodiments, an arc plate 374 is connected between adjacent scraper blades 37. The arc plate 374 is tangent to the slope, creating a smooth transition path from the slope to the arc plate 374. The scraped sludge can smoothly slide along the slope to the surface of the arc plate 374, and then flow continuously towards the center of the cavity of the scraper frame through the arc-shaped guide of the arc plate 374. There is no jamming or stagnation throughout the process, which improves the sludge collection efficiency and ensures that each part of the scraped sludge can be accurately and quickly merged into the core area of ​​the cavity.

[0028] In other embodiments, such as Figure 4 As shown, the sludge scraper 37 also includes a sludge suction plate 372. The sludge suction plate 372 is a stainless steel disc, welded to the inlet end of the second pipe 311. The bottom of the sludge suction plate (372) has a circular sludge inlet. The sludge inlet is divided into 8 evenly distributed small grids by a stainless steel partition. Each small grid has an independent channel. The upper ends of the independent channels converge and connect to the inlet end of the second pipe 311. The independent channels can ensure that even if some small grids are blocked, the other small grids can still suction sludge normally, ensuring the continuity of sludge suction. The even distribution of the 8 small grids can ensure that the sludge in each area of ​​the cavity is adsorbed, with no blind spots in adsorption.

[0029] Working principle: First, connect to an external clean water source through the second pipe 311 and inject clean water into the water tank 32 fixed on the truss assembly. At the same time, open the air vent valve on the top of the water tank 32 to expel the air in the tank and the connecting pipe. After the water tank 32 is full of clean water and no more air bubbles are discharged from the air vent valve, close the air vent valve and the water inlet valve of the second pipe 311.

[0030] The drive component 304 of the walking component 30 is activated, which drives the roller 302 to rotate. Since the roller 302 is engaged with the guide rails 2 on both sides of the top of the disinfection tank body 1, and the roller 302 is fixed to the truss component through the support frame 303, the truss component will move smoothly along the guide rails 2 towards one end of the disinfection tank body 1 with the roller 302, and simultaneously drive the scraper frame 37 at the bottom to move. At this time, the scraper plates 373 distributed in an X shape in the scraper frame 37 are in close contact with the bottom wall of the disinfection tank body 1. During the movement, the sludge deposited at the bottom of the tank is scraped and collected towards the center. The scraped sludge is guided by the 45° to 60° slope of the inner side wall of the scraper plate 373 and slides along the slope into the cavity of the scraper frame 37. The tangent arc plate 374 between adjacent scraper plates 373 ensures that the sludge flows smoothly into the cavity.

[0031] The sludge suction pump 33 is started synchronously. The sludge suction pump 33 generates negative pressure through the sludge suction plate 372 connected to the inlet end. The sludge inlet at the bottom of the sludge suction plate 372 is divided into several small compartments. Each small compartment is connected to the inlet end of the sludge suction pump 33 through an independent channel. The sludge collected in the cavity will enter the independent channel through these small compartments. The small compartments can block large particles of impurities (such as flocs and foreign objects) that may exist at the bottom of the pool, so as to avoid impurities clogging the sludge suction pump 33 or the pipe. Even if some small compartments are temporarily blocked, the other small compartments can still suction sludge normally. After being pressurized by the sludge suction pump 33, the sludge is transported to the sludge treatment pool outside the disinfection pool body 1 through the sludge discharge pipe 34 connected to the outlet end, completing the entire process of sludge discharge.

[0032] When the sludge suction assembly 3 moves to the end of the disinfection tank body 1 along with the walking assembly 30, the limit switch 301 located at the front end of the movement direction on the support frame 303 will contact the tank wall and be triggered; the limit switch 301 sends an electrical signal to the drive assembly 304, and the reduction motor of the drive assembly 304 will then rotate in the opposite direction, driving the roller 302 to move along the guide rail 2 to the other end of the disinfection tank body 1. The sludge suction assembly 3 moves in the opposite direction in sync, the sludge scraper 37 continues to repeat the sludge scraping and sludge collection action, and the sludge suction pump 33 continues to suck and discharge sludge; this process is repeated until the sludge on the bottom wall of the disinfection tank is completely removed. Throughout the process, the disinfection tank always maintains a normal sewage treatment and disinfection operation state.

[0033] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An automatic sludge suction device for a disinfection tank, characterized in that, Includes a sludge suction assembly (3) that moves back and forth on the disinfection pool body (1), the sludge suction assembly (3) includes a sludge suction pump (33), a truss assembly and a sludge scraper (37) connected to the bottom of the truss assembly. The bottom of the sludge scraper (37) is in close contact with the bottom wall of the disinfection tank body (1), and a sludge collection cavity is formed between the sludge scraper (37) and the bottom wall of the disinfection tank body (1). The inlet end of the sludge suction pump (33) is connected to the cavity and continuously discharges the sludge from the cavity.

2. The automatic sludge suction device for a disinfection tank according to claim 1, characterized in that, The suction assembly (3) includes a walking assembly (30), which includes a roller (302), a support frame (303), and a drive assembly (304). The support frames (303) are arranged in pairs on both sides of the truss assembly. The rollers (302) are connected to the end of each support frame (303), and each roller (302) is connected to the output end of the drive assembly (304). The drive assembly (304) drives the rollers (302) to move along the guide rail (2) on the disinfection pool body (1).

3. The automatic sludge suction device for a disinfection tank according to claim 2, characterized in that, The walking assembly (30) also includes a limit switch (301), which is connected to the support frame (303) and located in the direction of movement of the suction assembly (3). The limit switch (301) is also electrically connected to the drive assembly (304).

4. The automatic sludge suction device for a disinfection tank according to claim 1, characterized in that, The truss assembly includes an upper truss and a connecting frame (35). One end of the connecting frame (35) is connected to the upper truss, and the other end of the connecting frame (35) is connected to the scraper frame (37). A reinforcing rod (36) is connected to the outer diagonal of the connecting frame (35).

5. The automatic sludge suction device for a disinfection tank according to claim 1, characterized in that, The sludge scraper (37) includes a cover plate (371) and a sludge scraper (373). The sludge scraper (373) is arranged in an X shape at the bottom of the truss assembly to form a gradually expanding structure. The cover plate (371) covers the upper part of the gradually expanding structure to form the cavity. The inlet end of the sludge pump (33) is connected to the middle cavity of the gradually expanding structure.

6. The automatic sludge suction device for a disinfection tank according to claim 5, characterized in that, Multiple sets of the scraper frame (37) are provided, all of which are close to the bottom of the truss assembly.

7. An automatic sludge suction device for a disinfection tank according to claim 6, characterized in that, The inner wall of the scraper (373) is provided with a slope.

8. An automatic sludge suction device for a disinfection tank according to claim 7, characterized in that, The slope has an inclination angle of 45° to 60°.

9. An automatic sludge suction device for a disinfection tank according to claim 7, characterized in that, An arc plate (374) is connected between adjacent scraper blades (373), and the arc plate (374) is tangent to the slope.

10. An automatic sludge suction device for a disinfection tank according to claim 5, characterized in that, The scraper frame (37) also includes a suction plate (372), the bottom of which is divided into several small compartments, each of which has an independent channel connected to the inlet of the suction pump (33).

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