Overload protection and anti-blocking device for mud scraping equipment of sand-adding sedimentation tank

Abstract

The invention relates to the technical field of sewage treatment equipment, in particular to an overload protection and anti-blocking device for mud scraping equipment of a sand-adding sedimentation tank, which comprises a flushing mechanism and an overload moment protection mechanism, and the overload moment protection mechanism comprises a pressure sensor and a shaft power protector; the pressure sensor is mounted on a support at the top of the transmission case, the transmission case is fixedly mounted in the center of a working bridge at the top of the sedimentation tank, the gas-liquid adapter and the driving motor are mounted at the center and the edge of the top of the transmission case respectively, a torque plate is fixedly mounted on a shell of the driving motor, and a connecting rod is hinged to the tail end of the torque plate. One end of the connecting rod away from the torque plate is connected with the pressure sensor; and the flushing mechanism comprises an air inlet pipe, a hollow rotating shaft, a gas-liquid nozzle, a hollow slag plate cantilever and a flushing nozzle. The problems that a traditional mud scraper is rough in overload protection and difficult to maintain due to blockage are effectively solved, the fault probability is reduced, and the full-automatic management quality of sewage treatment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment equipment, in particular to an overload protection and anti-clogging device for sludge scraping equipment in a sand-added sedimentation tank. Background Art

[0002] With the rapid development of the national economy, water pollution is becoming increasingly serious. In underground sewage treatment plants, thickening scrapers are crucial equipment in sand-adding sedimentation tanks. Their primary function is to separate mud and water, using scrapers to gradually scrape mud and sand from the sides to a hopper in the center. During operation, a large amount of sediment accumulates at the bottom of the sand-adding sedimentation tank. When the sediment load exceeds the scraper's rated capacity, the machine risks overload damage. Therefore, the scraper must be equipped with an appropriate overload protection device.

[0003] Traditional scraper overload protection uses pins or elastic limit switches installed on the drive sprocket. This protection measure is inefficient and has poor precision. In addition, when the overload shutdown is not reset in time or cannot be reset, the mud collecting trough at the bottom of the sedimentation tank is easily blocked due to excessive sludge. The tank needs to be emptied during maintenance, which is time-consuming and labor-intensive. It is also impossible to judge the amount of sludge to start the residual sludge pump, sludge return pump, etc., which is not conducive to process production.

[0004] Therefore, there is an urgent need for a new type of overload protection and anti-clogging device for the sand-added sedimentation tank scraper equipment to ensure the long-term, stable and reliable operation of the sand-added sedimentation tank. Summary of the Invention

[0005] The object of the present invention is to provide an overload protection and anti-clogging device for a sludge scraping device in a sand-added sedimentation tank, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An overload protection and anti-clogging device for a sand-added sedimentation tank scraper includes a flushing mechanism and an overload torque protection mechanism: the overload torque protection mechanism includes a pressure sensor and a shaft power protector; the pressure sensor is mounted on a support on the top of a transmission box, the transmission box is fixedly mounted at the center of a working bridge on the top of the sedimentation tank, a gas-liquid adapter and a drive motor are respectively mounted at the center and edge of the top of the transmission box, a torque wrench is fixedly mounted on the housing of the drive motor, a connecting rod is hinged at the end of the torque wrench, and the end of the connecting rod away from the torque wrench is connected to the pressure sensor; the flushing mechanism includes an air inlet pipe, a hollow rotating shaft, a gas-liquid nozzle, an air Core slag plate cantilever and flushing nozzle; the hollow shaft is rotatably installed in the center of the sedimentation tank and driven by a drive motor, the lower end of the hollow shaft is located in the mud discharge bucket at the bottom of the sedimentation tank, and the gas-liquid nozzles are distributed on the part of the hollow shaft extending into the mud discharge bucket. The hollow slag plate cantilever is provided with at least one pair and is parallel to the bottom cone surface of the sedimentation tank. The scraper is installed on the hollow slag plate cantilever and the lower end is close to the bottom cone surface of the sedimentation tank. The flushing nozzle is also installed on the hollow slag plate cantilever and the nozzle is facing the scraper; one end of the air inlet pipe extends into the gas-liquid adapter and is rotatably sealed with the hollow shaft through a rotary joint, and the other end is connected to the air compressor. A water supply pipe is also connected between the two ends.

[0008] Furthermore, the overload torque protection mechanism also includes a mud plate angle adjustment device, which includes a control plate connecting rod, a turntable and a clutch structure; the control plate connecting rod is parallel to the hollow slag plate cantilever and the number corresponds one to one, and the two ends of the scraper plate are respectively hinged on the paired control plate connecting rods and the hollow slag plate cantilever, and the turntable is rotatably connected to the hollow rotating shaft through a shaft sleeve, and all the control plate connecting rods are hinged to the edge of the turntable near one end of the hollow rotating shaft; the clutch structure is installed on the hollow rotating shaft, which is used to control whether the turntable and the hollow rotating shaft are linked.

[0009] Furthermore, the clutch structure includes an electromagnetic ring and a sliding ferromagnetic ring. The electromagnetic ring is fixedly mounted on the hollow rotating shaft, and the sliding ferromagnetic ring is slidably mounted on the hollow rotating shaft. The sliding ferromagnetic ring is located above the shaft sleeve, and the electromagnetic ring is located above the sliding ferromagnetic ring. Splice teeth are distributed in an annular array on the lower end surface of the sliding ferromagnetic ring and the upper end surface of the shaft sleeve. The splice teeth on the sliding ferromagnetic ring are spliced ​​with the splice teeth on the shaft sleeve.

[0010] Furthermore, a keyway is distributed on the inner circumferential wall of the sliding ferromagnetic ring, and a convex key is distributed on the outer circumferential surface of the hollow shaft, and the convex key is slidably engaged with the keyway.

[0011] Furthermore, spring holes are distributed in a circular array on the upper end surface of the sliding ferromagnetic ring and the lower end surface of the electromagnetic ring, and springs are placed in the spring holes on the upper and lower sides.

[0012] Furthermore, a retractable sealing cover extending downward is provided on the edge of the electromagnetic ring, and the lower end of the sealing cover is connected to the edge of the sliding ferromagnetic ring.

[0013] Furthermore, the number of the flushing nozzles is twice that of the scraper, and a flushing nozzle is provided on the inner surface and the outer surface of the scraper respectively.

[0014] Furthermore, a truss perpendicular to the hollow rotating shaft is welded to the hollow rotating shaft, and the end of the truss is fixedly connected to the end of the hollow slag plate cantilever.

[0015] Furthermore, a non-elastic tensioning zipper is connected between the cantilever ends of adjacent hollow slag plates.

[0016] Furthermore, the torque wrench is installed at the chordal position of the transmission box top cover, the support and the drive motor are installed at the edge position of the transmission box top cover, and the torque wrench is close to the gas-liquid adapter to obtain the maximum length that the torque wrench can be installed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention uses the balanced force method to measure torque, monitors the resistance changes of the scraper mechanism in real time through a pressure sensor, and achieves precise overload protection in conjunction with a motor shaft power protector. Compared with traditional mechanical pin protection, it has faster dynamic response and higher precision, thus avoiding damage to the equipment due to instantaneous overload. The overload signal is linked to the control of the flushing mechanism, which can prevent compaction and blockage by stirring the deposited sludge in the sludge bucket, and spray water to the inner and outer surfaces of the scraper through the flushing nozzle to remove adhered sludge and reduce scraping resistance. The present invention effectively solves the problems of rough overload protection and difficult blockage maintenance of traditional scrapers, reduces the probability of failure, and improves the quality of fully automated management of sewage treatment.

[0019] 2. When an overload triggers a shutdown, the electromagnetic ring is energized, the sliding ferromagnetic ring moves upward, and the splice teeth disengage. This decouples the turntable from the hollow shaft, and the scraper blade adaptively deflects around the hinge point under sludge resistance, reducing scraping resistance and preventing compacted sludge from blocking the equipment. Simultaneously, this deflected scraper blade synergizes with airlift sludge removal, enhancing sludge fluidity and discharge efficiency, further reducing the risk of clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the overload protection and anti-clogging device of the mud scraping equipment in the sand-added sedimentation tank;

[0021] Figure 2 It is a schematic diagram of the structure of the transmission box and its upper components;

[0022] Figure 3 This is a schematic diagram of the internal structure of the overload protection and anti-clogging device of the sedimentation tank after vertical sectioning of the sedimentation tank;

[0023] Figure 4 This is a schematic diagram of the structure of the air intake pipe, gas-liquid adapter, hollow shaft, and mud scraping components;

[0024] Figure 5 Schematic diagram of the structure of the hollow shaft and the scraping mud component;

[0025] Figure 6 It is a schematic diagram of the structure of the mud scraper component and the mud blade angle adjustment device;

[0026] Figure 7 A partial enlarged view of the end of the mud scraper component and mud blade angle adjustment device;

[0027] Figure 8 It is a structural diagram of the clutch structure in the linkage state;

[0028] Figure 9 Schematic diagram of the clutch structure in the separated state.

[0029] In the figure: 1. Sedimentation tank; 2. Mud discharge bucket; 3. Mud discharge pipe; 4. Working bridge; 5. Transmission box; 6. Drive motor; 7. Torque wrench; 8. Pressure sensor; 9. Support; 10. Inlet pipe; 11. Gas-liquid adapter; 12. Hollow shaft; 13. Gas-liquid nozzle; 14. Hollow slag plate cantilever; 15. Mud scraper; 16. Connecting rod; 17. Turntable; 18. Bushing; 19. Sliding ferromagnetic ring; 20. Electromagnetic ring; 22. Spring; 25. Flushing nozzle; 26. Truss; 27. Non-elastic tensioning zipper. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1 to 9, an overload protection and anti-clogging device for sand-added sedimentation tank scraping equipment, including a flushing mechanism and an overload torque protection mechanism: the overload torque protection mechanism includes a pressure sensor 8 and a shaft power protector; the pressure sensor 8 is mounted on a support 9 on the top of a transmission box 5, and the transmission box 5 is fixedly mounted at the center of the working bridge 4 on the top of the sedimentation tank 1, and a gas-liquid adapter 11 and a drive motor 6 are respectively mounted at the center and edge of the top of the transmission box 5. A torque plate 7 is fixedly mounted on the housing of the drive motor 6, and a connecting rod is hinged at the end of the torque plate 7. The end of the connecting rod away from the torque plate 7 is connected to the pressure sensor 8; the flushing mechanism includes an air inlet pipe 10, a hollow rotating shaft 12, a gas-liquid nozzle 13, a hollow slag plate cantilever 14 and a flushing mechanism. Washing nozzle 25; the hollow rotating shaft 12 is rotatably installed in the center position of the sedimentation tank 1 and is driven by the driving motor 6. The lower end of the hollow rotating shaft 12 is located in the mud discharge bucket 2 at the bottom of the sedimentation tank 1. The gas-liquid nozzle 13 is distributed in the part of the hollow rotating shaft 12 extending into the mud discharge bucket 2. The hollow slag plate cantilever 14 is provided with at least one pair and is parallel to the inner bottom conical surface of the sedimentation tank 1. The scraper 15 is installed on the hollow slag plate cantilever 14 and the lower end is close to the inner bottom conical surface of the sedimentation tank 1. The flushing nozzle 25 is also installed on the hollow slag plate cantilever 14 and the nozzle is facing the scraper 15; one end of the air inlet pipe 10 extends into the gas-liquid adapter 11 and is rotatably sealed with the hollow rotating shaft 12 through a rotary joint. The other end is connected to the air compressor, and a water supply pipe is also connected between the two ends.

[0032] Furthermore, the number of the flushing nozzles 25 is twice that of the scraper blade 15 , and a flushing nozzle 25 is provided on each of the inner surface and the outer surface of the scraper blade 15 .

[0033] Furthermore, a truss 26 perpendicular to the hollow rotating shaft 12 is welded thereto, and an end of the truss 26 is fixedly connected to an end of the hollow slag plate cantilever 14 .

[0034] Furthermore, a non-elastic tensioning zipper 27 is connected between the ends of the adjacent hollow slag plate cantilevers 14 .

[0035] Furthermore, the torque wrench 7 is installed at the chordal position of the top cover of the transmission box 5, the support 9 and the drive motor 6 are installed at the edge position of the top cover of the transmission box 5, and the torque wrench 7 is close to the gas-liquid adapter 11 to obtain the maximum length that the torque wrench 7 can be installed.

[0036] Working principle of this embodiment:

[0037] like Figure 1 and Figure 3 As shown in the figure, after the raw water is settled in the sedimentation tank 1, the supernatant is discharged from the overflow weir plate, and the sludge in the raw water is settled at the bottom of the tank. Figure 2-3As shown, when the drive motor 4 rotates the hollow shaft through the transmission case 5, if the amount of sludge at the bottom of the sedimentation tank 1 increases, the resistance of the scraping mechanism to pushing the sludge increases, causing the transmission system torque to rise. At this point, the torque plate 7 of the transmission case 5, under reaction force, pushes the connecting rod, which transmits the force to the pressure sensor 8. The pressure sensor 8 indirectly calculates the real-time torque of the drive motor using the counterbalancing force exerted by the connecting rod: Torque = Force × Lever Arm. This method requires no direct contact with rotating components, avoiding dynamic measurement interference and offering high accuracy and stability. The pressure sensor 8 converts the real-time pressure value into an electrical signal, which activates the motor shaft power protector. The protector compares the current value with the pressure threshold to determine if there is an overload. In normal conditions, if the pressure value is less than or equal to the threshold, the motor continues to operate. In an overload condition, if the pressure value is greater than the threshold, the drive motor 4 is immediately powered off, scraping stops, and an alarm is triggered. The torque plate 7 is mounted chord-wise on the top cover of the transmission case 5. The support 9 and drive motor 6 are mounted at the edge of the top cover of the transmission case 5, with the torque plate 7 close to the gas-liquid adapter 11. This arrangement allows the torque plate 7 to be installed at its maximum length. As the length of the torque plate 7 increases, the lever arm increases, and when the torque remains unchanged, the end pressure decreases, thereby reducing the influence of interference factors of machine vibration on the pressure sensor 8.

[0038] like Figure 1-3 As shown, when the overload protection is triggered, the system automatically starts the air compressor and the solenoid valve, and the compressed air enters the hollow shaft 12 through the air inlet pipe 10 and is finally sprayed into the gas-liquid nozzle 13. The high-speed airflow stirs the deposited sludge in the sludge collecting bucket 2, reduces the sludge viscosity, and promotes the smooth discharge of the sludge through the sludge discharge pipe 3 to prevent compaction and blockage. In this embodiment, the air inlet pipe 10, the hollow slag plate cantilever 14 near one end of the hollow shaft, and the top of the gas-liquid nozzle 13 are provided with a solenoid valve to control the gas and liquid, which is not drawn in the figure. The air compressor delivers compressed air to the hollow shaft 12 through the air inlet pipe 10, and clean water can be injected into the water supply pipe at the same time. The gas-liquid mixture is sprayed into the sludge discharge bucket 2 at high speed through the gas-liquid nozzle 13 to stir the deposited sludge and prevent compaction and blockage. As shown Figure 3-4 As shown, the flushing nozzle 25 installed on the hollow slag plate cantilever 14 sprays water to the inner and outer surfaces of the scraper 15 to remove the adhered sludge and reduce the scraping resistance. Figure 7 As shown, the number of nozzles is twice that of scrapers, one inside and one outside, to ensure full cleaning coverage. Figure 4-5 As shown, the truss 26 and the non-elastic tensioning zipper 27 enhance the rigidity of the hollow slag plate cantilever to prevent deformation; the linkage design of the hollow shaft and the cantilever ensures that flushing and scraping are carried out synchronously.

[0039] This embodiment solves the problems of rough overload protection and difficult blockage maintenance of traditional scrapers through a flushing mechanism and an overload torque protection mechanism, reduces the probability of failure, and improves the quality of fully automated management of sewage treatment.

[0040] Example 2: Please refer to Figures 3 to 9, an overload protection and anti-blocking device for mud scraping equipment in a sand-added sedimentation tank, which differs from Example 1 in that, further, the overload torque protection mechanism also includes a mud plate angle adjustment device, which includes a control plate connecting rod 16, a turntable 17 and a clutch structure; the control plate connecting rod 16 is parallel to the hollow slag plate cantilever 14 and the number corresponds one to one, and the two ends of the mud scraper 15 are respectively hinged on the paired control plate connecting rods 16 and the hollow slag plate cantilever 14, and the turntable 17 is rotatably connected to the hollow rotating shaft 12 through a shaft sleeve 18, and all the control plate connecting rods 16 are hinged to the edge of the turntable 17 near the hollow rotating shaft 12; the clutch structure is installed on the hollow rotating shaft 12, and is used to control whether the turntable 17 and the hollow rotating shaft 12 are linked.

[0041] Furthermore, the clutch structure includes an electromagnetic ring 20 and a sliding ferromagnetic ring 19. The electromagnetic ring 20 is fixedly mounted on the hollow rotating shaft 12, and the sliding ferromagnetic ring 19 is slidably mounted on the hollow rotating shaft 12. The sliding ferromagnetic ring 19 is located above the shaft sleeve 18. The electromagnetic ring 20 is located above the sliding ferromagnetic ring 19. Splice teeth are distributed in an annular array on the lower end surface of the sliding ferromagnetic ring 19 and the upper end surface of the shaft sleeve 18. The splice teeth on the sliding ferromagnetic ring 19 are spliced ​​with the splice teeth on the shaft sleeve 18.

[0042] Furthermore, key grooves are distributed on the inner circumferential wall of the sliding ferromagnetic ring 19, and convex keys are distributed on the outer circumferential surface of the hollow shaft 12, and the convex keys are slidably engaged with the key grooves.

[0043] Furthermore, spring holes are distributed in a circular array on the upper end surface of the sliding ferromagnetic ring 19 and the lower end surface of the electromagnetic ring 20, and springs 22 are placed in the spring holes on the upper and lower sides.

[0044] Furthermore, a retractable sealing cover extending downward is provided on the edge of the electromagnetic ring 20 , and the lower end of the sealing cover is connected to the edge of the sliding ferromagnetic ring 19 .

[0045] Working principle in this embodiment:

[0046] The torque monitoring and overload protection in this embodiment are the same as those in Example 1. The drive motor 6 rotates the hollow shaft 12, and the torque is transmitted to the pressure sensor 8 via the torque lever 7 and the connecting rod. When excessive sludge accumulation causes the torque to exceed the limit, the shaft power protector cuts off the motor power supply, stopping the scraping.

[0047] like Figure 8 As shown, in the normal scraping state, the clutch mechanism is engaged, electromagnetic ring 20 is de-energized, and spring 22 is pressed downward, causing the splice teeth at the lower end of sliding ferromagnetic ring 19 to engage with the splice teeth at the upper end of sleeve 18. At this time, hollow shaft 12 drives rotating disk 17 synchronously through the clutch mechanism, control plate connecting rod 16 maintains a fixed angle, and scraper blade 15 scrapes mud at a standard inclination angle.

[0048] like Figure 9As shown, the clutch mechanism disengages in the overload protection state. When the overload triggers a shutdown, electromagnetic ring 20 is energized, sliding ferromagnetic ring 19 moves upward, and the splice teeth disengage. Rotary disk 17 is decoupled from hollow shaft 12, and scraper blade 15 adaptively deflects around the hinge point under sludge resistance, reducing scraping resistance and preventing compacted sludge from blocking the equipment. A retractable seal around the edge of electromagnetic ring 20 prevents sewage from entering the clutch mechanism, ensuring long-term reliable operation.

[0049] This embodiment optimizes the anti-clogging mechanism of the airlift in Example 1: After an overload shutdown, the system automatically activates the air compressor 9 and solenoid valve 10. Compressed air flows through the air inlet pipe 10, the air-to-liquid adapter 11, the hollow shaft 12, and the air-to-liquid nozzle 13, creating a high-speed flow that impacts the bottom of the sludge collecting tank 21, loosening deposited sludge and assisting in unblocking the sludge discharge pipe 24. Simultaneously, the deflected scraper 15 synergizes with the airlift sludge removal mechanism, enhancing sludge fluidity and improving sludge discharge efficiency, further reducing the risk of clogging.

[0050] This embodiment automatically disengages the clutch structure when overloaded, and the scraper reduces resistance through adaptive deflection to protect the equipment; and can achieve a linkage effect with the air lift anti-blocking effect to promote blockage clearing.

Claims

1. An overload protection and anti-clogging device for a sand-added sedimentation tank scraper, characterized in that: Including flushing mechanism and overload torque protection mechanism: The overload torque protection mechanism comprises a pressure sensor (8) and a shaft power protector; the pressure sensor (8) is mounted on a support (9) on the top of a transmission box (5); the transmission box (5) is fixedly mounted at the center of a working bridge (4) on the top of a sedimentation tank (1); a gas-liquid adapter (11) and a drive motor (6) are respectively mounted at the center and edge of the top of the transmission box (5); a torque wrench (7) is fixedly mounted on the housing of the drive motor (6); a connecting rod is hinged at the end of the torque wrench (7); and the end of the connecting rod away from the torque wrench (7) is connected to the pressure sensor (8); The flushing mechanism comprises an air inlet pipe (10), a hollow rotating shaft (12), a gas-liquid nozzle (13), a hollow slag plate cantilever (14) and a flushing nozzle (25); the hollow rotating shaft (12) is rotatably mounted at the center of the sedimentation tank (1) and driven by a drive motor (6); the lower end of the hollow rotating shaft (12) is located in the mud discharge bucket (2) at the bottom of the sedimentation tank (1); the gas-liquid nozzle (13) is distributed in the portion of the hollow rotating shaft (12) extending into the mud discharge bucket (2); the hollow slag plate cantilever (14) is connected to the bottom of the sedimentation tank (1) to form a flushing nozzle (25); At least one pair of scrapers (15) are provided and are parallel to the inner bottom conical surface of the sedimentation tank (1). The scraper blades (15) are installed on the hollow slag plate cantilever (14) and the lower end is close to the inner bottom conical surface of the sedimentation tank (1). The flushing nozzle (25) is also installed on the hollow slag plate cantilever (14) and the nozzle is directed toward the scraper blades (15). One end of the air inlet pipe (10) extends into the gas-liquid adapter (11) and is rotatably sealedly connected to the hollow rotating shaft (12) through a rotary joint. The other end is connected to the air compressor. A water supply pipe is also connected between the two ends.

2. The overload protection and anti-clogging device for the mud scraping equipment of the sand-added sedimentation tank according to claim 1 is characterized by: The overload torque protection mechanism further comprises a mud plate rotation angle adjustment device, which comprises a control plate connecting rod (16), a rotating disk (17) and a clutch structure; the control plate connecting rod (16) is parallel to the hollow slag plate cantilever (14) and the number of the control plate connecting rods (16) corresponds to one another; the two ends of the mud scraper (15) are respectively hinged on the paired control plate connecting rods (16) and the hollow slag plate cantilever (14); the rotating disk (17) is rotatably connected to the hollow rotating shaft (12) through a shaft sleeve (18); the ends of all the control plate connecting rods (16) close to the hollow rotating shaft (12) are hinged to the edge of the rotating disk (17); the clutch structure is installed on the hollow rotating shaft (12) and is used to control whether the rotating disk (17) and the hollow rotating shaft (12) are linked.

3. The overload protection and anti-clogging device for the mud scraping equipment of the sand-added sedimentation tank according to claim 2 is characterized in that: The clutch structure comprises an electromagnetic ring (20) and a sliding ferromagnetic ring (19), wherein the electromagnetic ring (20) is fixedly mounted on the hollow rotating shaft (12), and the sliding ferromagnetic ring (19) is slidably mounted on the hollow rotating shaft (12), the sliding ferromagnetic ring (19) is located above the shaft sleeve (18), and the electromagnetic ring (20) is located above the sliding ferromagnetic ring (19), and splicing teeth are distributed in an annular array on the lower end surface of the sliding ferromagnetic ring (19) and the upper end surface of the shaft sleeve (18), and the splicing teeth on the sliding ferromagnetic ring (19) are spliced ​​and matched with the splicing teeth on the shaft sleeve (18).

4. The overload protection and anti-clogging device for the mud scraping equipment of the sand-added sedimentation tank according to claim 3 is characterized by: A keyway is distributed on the inner circumferential wall of the sliding ferromagnetic ring (19), and a convex key is distributed on the outer circumferential surface of the hollow rotating shaft (12), and the convex key is slidably matched with the keyway.

5. The overload protection and anti-clogging device for the mud scraping equipment of the sand-added sedimentation tank according to claim 3 is characterized by: Spring holes are distributed in an annular array on the upper end surface of the sliding ferromagnetic ring (19) and the lower end surface of the electromagnetic ring (20), and springs (22) are placed in the spring holes on the upper and lower sides.

6. The overload protection and anti-clogging device for the sludge scraping equipment of the sand-added sedimentation tank according to claim 5 is characterized by: The edge of the electromagnetic ring (20) is provided with a telescopic sealing cover extending downward, and the lower end of the sealing cover is connected to the edge of the sliding ferromagnetic ring (19).

7. The overload protection and anti-clogging device for the sludge scraping equipment of the sand-added sedimentation tank according to claim 1 is characterized by: The number of the flushing nozzles (25) is twice that of the scraper (15), and a flushing nozzle (25) is respectively provided on the inner surface and the outer surface of the scraper (15).

8. The overload protection and anti-clogging device for the mud scraping equipment of the sand-added sedimentation tank according to claim 1 is characterized by: A truss (26) perpendicular to the hollow rotating shaft (12) is welded thereon, and the end of the truss (26) is fixedly connected to the end of the hollow slag plate cantilever (14).

9. The overload protection and anti-clogging device for the sludge scraping equipment of the sand-added sedimentation tank according to claim 1 is characterized by: A non-elastic tensioning zipper (27) is connected between the ends of adjacent hollow slag plate cantilevers (14).

10. The overload protection and anti-clogging device for the sludge scraping equipment of the sand-added sedimentation tank according to claim 1 is characterized by: The torque wrench (7) is installed at a chordal position of the top cover of the transmission box (5), the support (9) and the drive motor (6) are installed at the edge position of the top cover of the transmission box (5), and the torque wrench (7) is close to the gas-liquid adapter (11) to obtain the maximum length that the torque wrench (7) can be installed.

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