Medical waste friction heat treatment device

Abstract

The invention relates to the field of waste treatment, in particular to a medical waste friction heat treatment device which comprises a tank seat, a tank body is fixedly mounted on one side of the upper end of the tank seat, a cutter head is mounted in the center of the bottom of the inner side of the tank body, and two bearing frames are symmetrically and fixedly mounted at the upper end of the cutter head; an L-shaped auxiliary tool apron is rotationally installed between the two ends of the two bearing frames, the vertical sections of the two auxiliary tool aprons are sleeved with auxiliary tool bodies, the two auxiliary tool bodies are oppositely arranged, a main adjusting shaft is rotationally installed below the inner side of the cutter head, the two ends of the main adjusting shaft penetrate out of the two sides of the cutter head, and the main adjusting shaft is rotationally installed on the lower portion of the inner side of the cutter head. The two ends of the main adjusting shaft are each fixedly provided with a main tool apron, and the edge of the upper end of each main tool apron is provided with a main tool body. The grinding and smashing efficiency is improved, the angle of the auxiliary cutter body and the angle of the main cutter body can be rapidly adjusted, and meanwhile maintenance is convenient.

Description

Technical Field

[0001] This invention relates to the field of waste treatment, and more particularly to a friction heat treatment device for medical waste. Background Technology

[0002] Solid medical waste refers to the solid waste generated by medical and health institutions at all levels during their medical, preventive, healthcare, rehabilitation, teaching, and research activities. This solid medical waste is often treated using a friction heat treatment device. During treatment, the main and auxiliary blades inside the container rotate, thoroughly grinding and breaking down the solid medical waste and generating frictional heat to evenly heat the waste. This causes protein denaturation and coagulation of pathogenic microorganisms in the waste, leading to their death and achieving the harmless treatment of medical waste.

[0003] However, in existing friction heat treatment devices, the main blade and the auxiliary blade, which are the core components, are mostly designed as a single piece. This design completely limits the angle of the blade and makes it impossible to make flexible adjustments according to the type of medical waste, such as plastic, fabric, and metal sharps. As a result, it is difficult to achieve the best cutting and crushing effect during operation, resulting in low grinding and crushing efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a frictional heat treatment device for medical waste.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a friction heat treatment device for medical waste, comprising a tank base, a tank body fixedly installed on one side of the upper end of the tank base, a cutter disc installed at the center of the bottom inner side of the tank body, two support frames symmetrically fixedly installed on the upper end of the cutter disc, and auxiliary cutter seats rotatably installed between the two ends of the two support frames, the auxiliary cutter seats being L-shaped, and auxiliary cutter bodies sleeved on the vertical sections of the two auxiliary cutter seats, the two auxiliary cutter bodies being arranged in opposite directions, a main adjusting shaft rotatably installed on the lower inner side of the cutter disc, the two ends of the main adjusting shaft extending through the two sides of the cutter disc, and a main cutter seat fixedly installed at both ends of the main adjusting shaft, a main cutter body being provided at the upper edge of the main cutter seat, a pushing member installed on the upper end of the two support frames, the pushing member being connected to the auxiliary cutter seat and the main adjusting shaft respectively, and a driving member being provided on the other side of the upper end of the tank base, the driving member being connected to the cutter disc.

[0006] Preferably, a secondary adjustment shaft is rotatably mounted through the corner of the secondary blade holder, and the two ends of the secondary adjustment shaft are respectively fixed through the ends of the two support frames. The secondary blade body and the secondary blade holder, as well as the main blade holder and the main blade body, are fixed by bolts.

[0007] Preferably, the pusher includes a threaded rod, which is rotatably connected to two support frames. The upper and lower threads of the threaded rod are arranged in opposite directions. A pusher seat is screwed onto the upper part of the outer surface of the threaded rod. A secondary control tool holder is rotatably mounted on both ends of the pusher seat. The two secondary control tool holders are symmetrically arranged, and the ends of the two secondary control tool holders are rotatably connected to the opposite ends of the two secondary tool holders, respectively. A threaded sleeve is screwed onto the lower part of the outer surface of the threaded rod. The threaded sleeve extends into the interior of the tool disc and slides with the tool disc. A main control tool holder is connected between the threaded sleeve and the main adjustment shaft. The main control tool holder is inclined.

[0008] Preferably, an upper connector is rotatably mounted on the upper end of the main control tool holder, the upper end of the upper connector is fixed to the lower end of the threaded sleeve, a lower connector is fixedly mounted through the middle of the main adjustment shaft, and the lower end of the main control tool holder is rotatably mounted inside the lower connector.

[0009] Preferably, a rod seat is rotatably mounted on the outer surface of the threaded rod near its upper edge, and the two ends of the rod seat are respectively fixed to the upper middle part of the two support frames.

[0010] Preferably, the driving component includes a motor platform, which is slidably connected to the other side of the upper end of the tank base. A drive motor is fixedly installed through the middle of the upper end of the motor platform. A main shaft is fixedly installed coaxially at the lower end of the cutter head. The main shaft extends through the lower end of the tank body and the lower end of the tank base. The main shaft is rotatably engaged with the tank body and the tank base. A large pulley is fixedly installed coaxially at the lower end of the main shaft. A small pulley is fixedly installed coaxially at the output end of the drive motor. Multiple belts are connected between the small pulley and the large pulley.

[0011] Preferably, a first protrusion is fixedly installed at the lower edge of the motor platform, a pusher stud is rotatably installed through the side of the first protrusion, a second protrusion is screwed onto the outer surface of the pusher stud, the second protrusion is fixed to the tank seat, a locking base is fixedly installed at the upper edge of the motor platform, a rotating rod is elastically installed at the upper edge of the tank seat, a locking lug is fixedly installed at the end of the rotating rod, and the locking lug engages inside the locking base.

[0012] Preferably, a handwheel is coaxially fixedly installed at the end of the pusher stud; a locking frame is rotatably installed on the outer surface of the rotating rod; the lower end of the locking frame is fixed to the can seat; a convex ring is coaxially fixedly installed on the outer surface of the rotating rod near the locking frame; a torsion spring is installed between the convex ring and the locking frame; the rotating rod passes through the inside of the torsion spring; a bushing is rotatably installed on the outer surface of the main shaft; the upper end of the bushing is fixed to the can seat; guide seats are provided at both the front and rear of the motor platform; the guide seats are fixed to the can seat; a slider is slidably installed inside the guide seat; and the end of the slider is fixed to the motor platform.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By rotating the secondary blade holder and the main adjustment shaft, the secondary blade body and the main blade body can be rotated respectively to change the angle of the blade body. This allows for adjustment of the blade body angle according to the type of medical waste, such as plastic, fabric, and metal sharps, thereby improving the efficiency of grinding and crushing.

[0014] 2. By rotating the threaded rod, the push seat can be moved upward, which in turn moves the secondary control tool holder, causing the secondary tool holder to rotate around the secondary adjustment shaft. This causes the secondary tool body to turn outward, adjusting its angle. Simultaneously, the rotating threaded rod also causes the threaded sleeve to move downward, driving the main control tool holder to rotate the main adjustment shaft, which in turn rotates the main tool body, adjusting its angle. The process only requires rotating the threaded rod to simultaneously adjust the angles of the secondary and main tool bodies. The operation is simple, and the threaded rod can be rotated from above the tank using a lever-shaped wrench, thus achieving the purpose of quickly adjusting the secondary and main tool bodies.

[0015] 3. By rotating the lever, the locking lug is rotated out of the locking base. Then, the pusher stud is rotated to drive the motor platform to move towards the tank, thereby reducing the gap between the small pulley and the large pulley. This loosens the multiple belts that are being tensioned between them, allowing the belts to be removed for maintenance. This process avoids the problem of belts being difficult to remove due to tension, effectively facilitating maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a friction heat treatment device for medical waste according to the present invention; Figure 2 This is a schematic diagram from another perspective of a frictional heat treatment device for medical waste according to the present invention. Figure 3 This is a bottom view of a friction heat treatment device for medical waste according to the present invention; Figure 4 This invention relates to a friction heat treatment device for medical waste. Figure 2 Enlarged view of A in the middle; Figure 5 This is a schematic diagram of the inner bottom surface of the tank of a friction heat treatment device for medical waste according to the present invention; Figure 6 This invention relates to a friction heat treatment device for medical waste. Figure 5 Enlarged view of B in the middle; Figure 7 This is an internal view of the cutter head of a friction heat treatment device for medical waste according to the present invention. Figure 8 This invention relates to a friction heat treatment device for medical waste. Figure 7 A magnified view of C.

[0017] In the diagram: 1. Tank base; 2. Tank body; 3. Drive motor; 4. Bushing; 5. Large pulley; 6. Guide seat; 7. Small pulley; 8. Belt; 9. Main spindle; 10. Main adjusting shaft; 11. Secondary control tool holder; 12. Lower connector; 13. Main control tool holder; 14. Upper connector; 15. Threaded cam sleeve; 16. Bearing frame; 17. Rod seat; 18. Threaded rod; 19. Push seat; 20. Secondary tool holder; 21. Secondary tool body; 22. Main tool body; 23. Secondary adjusting shaft; 24. Tool disc; 25. Slider; 26. Motor platform; 27. No. 1 cam seat; 28. No. 2 cam seat; 29. ​​Pusher stud; 30. Handwheel; 31. Locking frame; 32. Rotating rod; 33. Locking ear; 34. Convex ring; 35. Torsion spring; 36. Locking base; 37. Main tool holder. Detailed Implementation

[0018] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0019] like Figures 1-8 The device for friction heat treatment of medical waste shown includes a tank base 1. A tank body 2 is fixedly installed on one side of the upper end of the tank base 1. The tank body 2 serves to contain solid medical waste. A cutter disc 24 is installed at the center of the bottom inner side of the tank body 2. Two support frames 16 are symmetrically fixedly installed on the upper end of the cutter disc 24. A secondary cutter seat 20 is rotatably installed between the two ends of the two support frames 16. The support frames 16 support the secondary cutter seats 20. The secondary cutter seats 20 are L-shaped. A secondary cutter body 21 is sleeved on the vertical section of each of the two secondary cutter seats 20. The secondary cutter seats 20 serve to install the secondary cutter bodies 21. The two secondary cutter bodies 21 are arranged opposite to each other. A main adjusting shaft 10 is rotatably installed on the lower inner side of the cutter disc 24. The two ends of the main adjusting shaft 10 pass through the two sides of the cutter disc 24. Both ends of the main adjusting shaft 10 are fixedly mounted with main blade holders 37, which serve to support the main blade holders 37. The main blade body 22 is provided at the upper edge of the main blade holder 37, which serves to mount the main blade body 22. Pushing components are installed at the upper ends of the two support frames 16, which are connected to the auxiliary blade holder 20 and the main adjusting shaft 10 respectively. A driving component is provided on the other side of the upper end of the can seat 1, which is connected to the blade disc 24. By rotating the auxiliary blade holder 20 and the main adjusting shaft 10, the auxiliary blade body 21 and the main blade body 22 can be driven to rotate respectively, thereby changing the angle of the blade body. This achieves the purpose of adjusting the blade body angle according to the adaptability of medical waste types such as plastics, fabrics, and metal sharp objects, thereby improving the grinding and crushing efficiency.

[0020] A secondary adjustment shaft 23 is rotatably mounted through the corner of the secondary tool holder 20. The two ends of the secondary adjustment shaft 23 are respectively fixed through the ends of the two support frames 16. The secondary adjustment shaft 23 can connect the secondary tool holder 20 and the support frame 16 together and ensure that the secondary tool holder 20 rotates normally. The secondary tool body 21 and the secondary tool holder 20, and the main tool holder 37 and the main tool body 22 are all fixed by bolts. The bolt fixing method can facilitate the disassembly and replacement of the secondary tool body 21 and the main tool body 22.

[0021] The pusher includes a threaded rod 18, which is rotatably connected to two support frames 16. The upper and lower threads of the threaded rod 18 are arranged in opposite directions, which can drive the pusher seat 19 and the threaded sleeve 15 to move in opposite directions. The pusher seat 19 is screwed onto the upper part of the outer surface of the threaded rod 18. A secondary control tool holder 11 is rotatably mounted on both ends of the pusher seat 19. The two secondary control tool holders 11 are symmetrically arranged, and the ends of the two secondary control tool holders 11 are rotatably connected to the opposite ends of the two secondary tool seats 20, respectively. By rotating the threaded rod 18, the pusher seat 19 can be moved upward, thereby driving the secondary control tool holders 11 to move, so as to drive the secondary tool seat 20 to rotate around the secondary adjustment shaft 23, thereby causing the secondary tool body 21 to flip outward to adjust the angle of the secondary tool body 21. A threaded sleeve is screwed onto the lower part of the outer surface of the threaded rod 18. 15. The threaded sleeve 15 extends into the interior of the cutter head 24, and the threaded sleeve 15 slides in fit with the cutter head 24. A main control cutter holder 13 is connected between the threaded sleeve 15 and the main adjustment shaft 10. The main control cutter holder 13 is inclined, which facilitates pushing the main adjustment shaft 10. The rotating threaded rod 18 will also drive the threaded sleeve 15 to move downward, thereby driving the main control cutter holder 13 to move, so as to drive the main adjustment shaft 10 to rotate, thereby driving the main cutter body 22 to rotate, so as to adjust the angle of the main cutter body 22. The process only requires rotating the threaded rod 18 to simultaneously complete the angle adjustment of the auxiliary cutter body 21 and the main cutter body 22. The operation is simple, and the threaded rod 18 can be rotated from the top of the tank 2 using a rod-shaped wrench, thereby achieving the purpose of quickly adjusting the auxiliary cutter body 21 and the main cutter body 22.

[0022] An upper connector 14 is rotatably mounted on the upper end of the main control tool holder 13. The upper end of the upper connector 14 is fixed to the lower end of the threaded sleeve 15. The upper connector 14 serves to connect the main control tool holder 13 and the threaded sleeve 15. A lower connector 12 is fixedly mounted through the middle of the main adjustment shaft 10. The lower end of the main control tool holder 13 is rotatably mounted inside the lower connector 12. The lower connector 12 serves to connect the main adjustment shaft 10 and the main control tool holder 13.

[0023] A rod seat 17 is rotatably mounted on the outer surface of the threaded rod 18 near the upper edge. The two ends of the rod seat 17 are fixed to the upper middle part of the two bearing frames 16 respectively. The rod seat 17 serves to support the threaded rod 18.

[0024] The drive unit includes a motor platform 26, which is slidably connected to the other side of the upper end of the tank base 1. A drive motor 3 is fixedly mounted through the middle of the upper end of the motor platform 26, providing support for the drive motor 3. A main shaft 9 is coaxially fixedly mounted on the lower end of the cutter head 24, providing load-bearing capacity for the cutter head 24. The main shaft 9 extends from the lower end of the tank body 2 and the lower end of the tank base 1, and rotates with the tank body 2 and the tank base 1. A large pulley 5 is coaxially fixedly mounted on the lower end of the main shaft 9. A small pulley 7 is coaxially fixedly installed at the output end of the drive motor 3. Multiple belts 8 are connected between the small pulley 7 and the large pulley 5. The drive motor 3 drives the cutter disc 24 on the main shaft 9 to rotate through the belts 8, which in turn drives the auxiliary cutter body 21 and the main cutter body 22 to rotate, so as to fully grind and crush the solid medical waste in the tank 2. At the same time, the frictional heat generated between the cutter body and the solid medical waste heats the waste evenly, causing the pathogenic microorganisms in the waste to denature and coagulate, thus killing the pathogenic microorganisms and achieving the harmless treatment of medical waste.

[0025] A first boss 27 is fixedly installed at the lower edge of the motor platform 26. A pusher stud 29 is rotatably mounted through the side of the first boss 27. The first boss 27 serves to connect the pusher stud 29. A second boss 28 is screwed onto the outer surface of the pusher stud 29. The second boss 28 can engage with the thread of the pusher stud 29 to drive the motor platform 26 to move. The second boss 28 is fixed to the tank base 1. A locking base 36 is fixedly installed at the upper edge of the motor platform 26. A rotating rod 32 is elastically installed at the upper edge of the tank base 1. A locking lug 33 is fixedly installed at the end of the rotating rod 32 and engages with the locking base 36. Inside 6, the engagement between the locking base 36 and the locking ear 33 locks the motor platform 26, reducing the stress on the pusher stud 29 when the belt 8 is tensioned. By rotating the rotating rod 32, the locking ear 33 is rotated out of the locking base 36, and the pusher stud 29 is rotated further, which drives the motor platform 26 to move towards the tank 2, thereby reducing the gap between the small pulley 7 and the large pulley 5. This allows the multiple belts 8 that are tensioned between them to loosen, and the belts 8 can then be removed for maintenance. This process avoids the problem of the belts 8 being difficult to remove due to tension, effectively facilitating maintenance.

[0026] A handwheel 30 is coaxially fixed to the end of the pusher stud 29. The handwheel 30 facilitates the rotation of the pusher stud 29. A locking frame 31 is rotatably mounted on the outer surface of the rotating rod 32. The lower end of the locking frame 31 is fixed to the tank base 1. The locking frame 31 supports the rotating rod 32. A convex ring 34 is coaxially fixed to the side of the outer surface of the rotating rod 32 near the locking frame 31. A torsion spring 35 is installed between the convex ring 34 and the locking frame 31. The torsion spring 35 allows the locking lug 3 to be secured. The 3-lock mechanism 36 is engaged within the locking base 36. The rotating rod 32 passes through the inside of the torsion spring 35. The outer surface of the main shaft 9 is rotatably mounted with a bushing 4. The upper end of the bushing 4 is fixed to the tank base 1. The bushing 4 serves to strengthen the connection of the main shaft 9. Guide seats 6 are provided at both the front and rear of the motor platform 26. The guide seats 6 are fixed to the tank base 1. A slider 25 is slidably mounted inside the guide seats 6. The guide seats 6 and the slider 25 serve to guide the motor platform 26. The end of the slider 25 is fixed to the motor platform 26.

[0027] In use, the drive motor 3 drives the cutter disc 24 on the main shaft 9 to rotate via the belt 8, which in turn drives the auxiliary cutter body 21 and the main cutter body 22 to rotate, thoroughly grinding and crushing the solid medical waste in the tank 2. At the same time, the frictional heat generated between the cutter body and the solid medical waste evenly heats the waste, causing protein denaturation and coagulation of pathogenic microorganisms in the waste, thus killing the pathogenic microorganisms and achieving the harmless treatment of medical waste. Simultaneously, a rod-shaped wrench can be used to reach into the top of the tank 2 to rotate the threaded rod 18, thereby driving the push seat through the rotating threaded rod 18. The upward movement of 19 causes the secondary control blade holder 11 to move, which in turn drives the secondary blade holder 20 to rotate around the secondary adjustment shaft 23, thereby causing the secondary blade body 21 to flip outward to adjust the angle of the secondary blade body 21. At the same time, the rotating threaded rod 18 also causes the threaded sleeve 15 to move downward, which in turn drives the main control blade holder 13 to move, thereby driving the main adjustment shaft 10 to rotate, which in turn drives the main blade body 22 to rotate to adjust the angle of the main blade body 22. This allows for adjustment of the blade angle according to the adaptability of medical waste types such as plastics, fabrics, and metal sharps, thereby improving the grinding and crushing efficiency.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A friction heat treatment device for medical waste, comprising a tank base (1), characterized in that: A tank body (2) is fixedly installed on one side of the upper end of the tank base (1). A cutter head (24) is installed at the center of the bottom of the inner side of the tank body (2). Two support frames (16) are symmetrically fixedly installed on the upper end of the cutter head (24). A secondary cutter seat (20) is rotatably installed between the two ends of the two support frames (16). The secondary cutter seat (20) is L-shaped. A secondary cutter body (21) is sleeved on the vertical section of the two secondary cutter seats (20). The two secondary cutter bodies (21) are arranged opposite to each other. The inner side of the cutter head (24) rotates downwards. A main adjusting shaft (10) is installed, with both ends of the main adjusting shaft (10) extending through both sides of the cutter head (24). A main cutter holder (37) is fixedly installed at both ends of the main adjusting shaft (10). A main cutter body (22) is provided at the upper edge of the main cutter holder (37). Pushing members are installed at the upper ends of the two support frames (16). The pushing members are connected to the auxiliary cutter holder (20) and the main adjusting shaft (10) respectively. A driving member is provided on the other side of the upper end of the tank seat (1). The driving member is connected to the cutter head (24).

2. The medical waste friction heat treatment device according to claim 1, characterized in that: A secondary adjustment shaft (23) is rotatably mounted through the corner of the secondary blade holder (20). The two ends of the secondary adjustment shaft (23) are respectively fixed through the ends of the two support frames (16). The secondary blade body (21) and the secondary blade holder (20), and the main blade holder (37) and the main blade body (22) are all fixed by bolts.

3. The medical waste friction heat treatment device according to claim 1, characterized in that: The pusher includes a threaded rod (18), which is rotatably connected to two support frames (16). The upper and lower threads of the threaded rod (18) are arranged in opposite directions. A pusher seat (19) is screwed onto the upper part of the outer surface of the threaded rod (18). A secondary control tool holder (11) is rotatably installed at both ends of the pusher seat (19). The two secondary control tool holders (11) are symmetrically arranged. The ends of the two secondary control tool holders (11) are rotatably connected to the opposite ends of the two secondary tool seats (20). A threaded sleeve (15) is screwed onto the lower part of the outer surface of the threaded rod (18). The threaded sleeve (15) extends into the interior of the cutter disc (24). The threaded sleeve (15) slides with the cutter disc (24). A main control tool holder (13) is connected between the threaded sleeve (15) and the main adjustment shaft (10). The main control tool holder (13) is inclined.

4. The medical waste friction heat treatment device according to claim 3, characterized in that: The upper end of the main control tool holder (13) is rotatably mounted with an upper connector (14), the upper end of the upper connector (14) is fixed to the lower end of the threaded sleeve (15), the middle part of the main adjustment shaft (10) is fixedly mounted with a lower connector (12), and the lower end of the main control tool holder (13) is rotatably mounted inside the lower connector (12).

5. The medical waste friction heat treatment device according to claim 3, characterized in that: A rod seat (17) is rotatably mounted on the outer surface of the threaded rod (18) near the upper edge. The two ends of the rod seat (17) are respectively fixed to the upper middle part of the two support frames (16).

6. The medical waste friction heat treatment device according to claim 1, characterized in that: The drive unit includes a motor platform (26), which is slidably connected to the other side of the upper end of the tank base (1). A drive motor (3) is fixedly installed through the middle of the upper end of the motor platform (26). A main shaft (9) is fixedly installed coaxially at the lower end of the cutter head (24). The main shaft (9) extends through the lower end of the tank body (2) and the lower end of the tank base (1). The main shaft (9) rotates with the tank body (2) and the tank base (1). A large pulley (5) is fixedly installed coaxially at the lower end of the main shaft (9). A small pulley (7) is fixedly installed coaxially at the output end of the drive motor (3). Multiple belts (8) are connected between the small pulley (7) and the large pulley (5).

7. The medical waste friction heat treatment device according to claim 6, characterized in that: A first boss (27) is fixedly installed at the lower edge of the motor platform (26). A pusher stud (29) is rotatably installed through the side of the first boss (27). A second boss (28) is screwed onto the outer surface of the pusher stud (29). The second boss (28) is fixed to the tank seat (1). A locking base (36) is fixedly installed at the upper edge of the motor platform (26). A rotating rod (32) is elastically installed at the upper edge of the tank seat (1). A locking lug (33) is fixedly installed at the end of the rotating rod (32). The locking lug (33) is engaged inside the locking base (36).

8. The medical waste friction heat treatment device according to claim 7, characterized in that: A handwheel (30) is coaxially fixed to the end of the pusher stud (29). A locking frame (31) is rotatably mounted on the outer surface of the rotating rod (32). The lower end of the locking frame (31) is fixed to the tank seat (1). A convex ring (34) is coaxially fixed to the side of the rotating rod (32) near the locking frame (31). A torsion spring (35) is installed between the convex ring (34) and the locking frame (31). The rotating rod (32) passes through the inside of the torsion spring (35). A bushing (4) is rotatably mounted on the outer surface of the main shaft (9). The upper end of the bushing (4) is fixed to the tank seat (1). Guide seats (6) are provided at both the front and rear of the motor platform (26). The guide seats (6) are fixed to the tank seat (1). A slider (25) is slidably mounted inside the guide seats (6). The end of the slider (25) is fixed to the motor platform (26).

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