Variable frequency anchor winch safety protection mechanism

Abstract

The application relates to the technical field of anchor winches, and discloses a variable-frequency anchor winch safety protection mechanism, which comprises a base, a fixing seat is fixedly connected to the upper end of the base, a first rotating shaft is rotationally connected to the upper end of the fixing seat through a first supporting seat, two winding rollers are fixedly connected to the side wall of the first rotating shaft, a second rotating shaft is rotationally connected to the upper end of the fixing seat through a second supporting seat, two pinions are fixedly connected to the side wall of the second rotating shaft, two gear wheels are fixedly connected to the side wall of the first rotating shaft, and the two pinions are in mesh with the two gear wheels respectively. In the emergency working condition of power failure, motor failure or electrical brake failure, the locking of the winding roller can be manually completed by the operator, the friction force directly acts on the roller body, the braking is reliable and the response is rapid, the anchor chain is prevented from slipping or reversing due to load impact, the defect that the traditional electrical braking is poor in reliability is made up, and the safety accident risk of equipment out of control is reduced.

Description

Technical Field

[0001] This invention relates to the field of anchor winch technology, and in particular to a safety protection mechanism for a variable frequency anchor winch. Background Technology

[0002] Anchor winches are key deck machinery in the field of shipbuilding and marine engineering, mainly used for the raising and lowering of anchor chains, ship mooring and towing operations.

[0003] Currently, most anchor winches use electric braking to lock and limit the anchor chain winding and unwinding. However, the offshore operating environment is humid and highly corrosive with salt spray, making electrical components prone to aging and damage. Power outages or circuit failures can easily lead to brake failure, causing safety accidents such as chain slippage and roller reversal, seriously threatening the safety of ships and personnel. Furthermore, anchor chains are constantly immersed in seawater and frequently come into contact with mud, sand, and reefs, making their surfaces highly susceptible to the adhesion of corrosive salts, mud, and marine organisms. Currently, the anchor chain winding process simply involves rinsing with water, without any surface maintenance, which accelerates the corrosion, wear, and even breakage of the anchor chain. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantages of safety accidents such as chain slippage and roller reversal, as well as the need for maintenance of the anchor chain surface. To this end, we propose a safety protection mechanism for variable frequency anchor winches.

[0005] To achieve the above objectives, this application adopts the following technical solution: a safety protection mechanism for a variable frequency anchor winch, comprising a base, a fixed seat fixedly connected to the upper end of the base, a first rotating shaft rotatably connected to the upper end of the fixed seat via a first support seat, two winding rollers fixedly connected to the side wall of the first rotating shaft, a second rotating shaft rotatably connected to the upper end of the fixed seat via a second support seat, two small gears fixedly connected to the side wall of the second rotating shaft, two large gears fixedly connected to the side wall of the first rotating shaft, the two small gears meshing with the two large gears respectively, a first motor for driving the small gears to rotate fixedly connected to the side wall of one of the second support seats, and a protective mechanism provided on the winding rollers; The protective mechanism includes a friction ring sleeved on the side wall of the winding roller, a pull plate rotatably connected to the upper end of the fixed seat, a pull rod rotatably connected to the side wall of the pull plate, a threaded rod threadedly connected to the side wall of the pull rod, the side walls of both ends of the friction ring being threadedly connected to the side walls of the threaded rod, a handle being fixedly connected to the upper end of the threaded rod, and anchor chains being provided on both winding rollers.

[0006] Preferably, the base is provided with a processing mechanism for the anchor chain. The processing mechanism includes a cleaning box fixedly connected to the upper end of the base. Two opening slots are symmetrically opened on the upper part of the inner wall of the cleaning box. Two first conveying rollers are installed on the upper part of the inner wall of the cleaning box, and two second conveying rollers are installed on the lower part of the inner wall of the cleaning box. A third conveying roller is installed on the upper end of the fixed seat. The two side walls of the anchor chain pass through the two opening slots respectively, and the two side walls of the anchor chain are respectively attached to the side walls of the first conveying roller, the second conveying roller and the third conveying roller.

[0007] Preferably, a U-shaped plate is slidably connected to the inner wall of the cleaning tank, and two connecting plates are symmetrically fixedly connected to the side wall of the U-shaped plate near the anchor chain. Multiple brush bristles are fixedly connected to the side walls of the two connecting plates that are close to each other, and the side walls of the multiple brush bristles are in contact with the side wall of the anchor chain.

[0008] Preferably, a water spray pipe is fixedly connected through the upper part of the inner wall of the cleaning box near the third conveyor roller. The inner wall of the water spray pipe has multiple water spray holes that are directly opposite the anchor chain. An elastic filter screen is fixedly connected to the inner wall of the cleaning box below the second conveyor roller. A water pump is fixedly connected to the bottom of the cleaning box. The output end of the water pump is fixedly connected to the inner wall of the water spray pipe through a water outlet pipe.

[0009] Preferably, permanent magnet blocks are fixedly connected to the side walls of both second conveying rollers, and two iron blocks corresponding to the two permanent magnet blocks are fixedly connected to the lower end of the elastic filter screen.

[0010] Preferably, a horizontal plate is fixedly connected to the side wall of the cleaning box near the third conveying roller. Two cylinders are rotatably connected through the side wall of the horizontal plate. The two anchor chains are located in the two cylinders respectively. The outer side walls of the two cylinders are provided with a first annular groove and a second annular groove. The inner walls of the first annular groove and the second annular groove are provided with multiple rectangular grooves.

[0011] Preferably, a sponge is fixedly connected to the inner wall of the cylinder near the second annular groove, a hot air pipe communicating with the inner walls of the two first annular grooves is fixedly connected to the upper end of the horizontal plate, and a liquid inlet pipe communicating with the inner walls of the two second annular grooves is fixedly connected to the upper end of the horizontal plate.

[0012] Preferably, the side wall of the cleaning tank is rotatably connected to a reciprocating screw via a bracket, the side wall of the reciprocating screw is threadedly connected to the side wall of the U-shaped plate, and a second motor is fixedly connected to one of the brackets, the output end of the second motor being fixedly connected to one end of the reciprocating screw.

[0013] Preferably, a first synchronous pulley is fixedly connected to both the reciprocating screw sidewall and one of the cylindrical sidewalls, a synchronous belt is connected between the two first synchronous pulleys, a second synchronous pulley is fixedly connected to both cylindrical sidewalls, and a synchronous belt is connected between the two second synchronous pulleys.

[0014] The technical effects and advantages of this invention are as follows: 1. By installing a friction ring on the winding roller and using a manual mechanical clamping mechanism consisting of a pull plate, pull rod, and threaded rod, the winding roller can be manually locked by the operator in emergency situations such as power failure, motor failure, or electrical brake failure. The braking is directly applied to the roller body through friction, which is reliable and responsive. This prevents the anchor chain from slipping or reversing due to load impact, making up for the poor reliability of traditional electrical brakes and reducing the risk of safety accidents caused by equipment loss of control.

[0015] 2. The friction ring can loosen the winding roller when not necessary, so that the motor only bears the normal winding and unwinding load, avoiding the continuous increase of the additional resistance of the first motor due to the unexpected force on the anchor chain, thus protecting the motor and improving the operating stability of the transmission system.

[0016] 3. After the anchor chain is cleaned, it enters the cylinder. At this time, hot air is introduced into the first annular groove through the hot air pipe to quickly remove residual moisture on the surface of the anchor chain and inhibit rust formation. Then, the liquid inlet pipe injects protective oil into the second annular groove. With the help of a sponge, the anchor chain surface is evenly coated with oil for maintenance, which improves the anchor chain's resistance to seawater and humid environments and extends the service life of the anchor chain.

[0017] 4. When the permanent magnet on the side wall of the second conveyor roller rotates, it periodically attracts the iron block at the lower end of the elastic filter screen. By using magnetic attraction, filter screen elasticity and the weight of the iron block, the elastic filter screen continuously generates small vibrations, automatically shaking off the attached impurities, avoiding filter screen blockage and reducing the frequency of manual cleaning. Attached Figure Description

[0018] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a structural schematic diagram of a variable frequency anchor winch safety protection mechanism according to the present invention; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 This is a vertical cross-sectional view of a safety protection mechanism for a variable frequency anchor winch according to the present invention. Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 for Figure 3 Enlarged structural diagram at point C; Figure 6 This is a vertical cross-sectional view of the water pump in a variable frequency anchor winch safety protection mechanism according to the present invention. Figure 7This is a rear-view three-dimensional structural diagram of a variable frequency anchor winch safety protection mechanism according to the present invention; Figure 8 This is a schematic diagram of the structure of the two cylinders in a variable frequency anchor winch safety protection mechanism according to the present invention.

[0019] Legend: 1. Base; 2. Fixed seat; 3. First rotating shaft; 4. Winding roller; 5. Second rotating shaft; 6. Small gear; 7. Large gear; 8. Friction ring; 9. Pull plate; 10. Pull rod; 11. Threaded rod; 12. Handle; 13. First motor; 14. Anchor chain; 15. Cleaning tank; 16. Opening slot; 17. First conveyor roller; 18. Second conveyor roller; 19. Third conveyor roller; 20. U-shaped plate; 21. Connecting plate 22. Brush bristles; 23. Water spray pipe; 24. Water spray hole; 25. Elastic filter screen; 26. Water pump; 27. Water outlet pipe; 28. Permanent magnet block; 29. ​​Iron block; 30. Horizontal plate; 31. Cylinder; 32. First annular groove; 33. Second annular groove; 34. Rectangular groove; 35. Sponge; 36. Hot air pipe; 37. Liquid inlet pipe; 38. Reciprocating lead screw; 39. Second motor; 40. First synchronous pulley; 41. Second synchronous pulley. Detailed Implementation

[0020] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0021] Reference Figures 1-8 As shown, the present invention provides a technical solution: a safety protection mechanism for a variable frequency anchor winch, including a base 1, a fixed seat 2 fixedly connected to the upper end of the base 1, a first rotating shaft 3 rotatably connected to the upper end of the fixed seat 2 via a first support seat, two winding rollers 4 fixedly connected to the side wall of the first rotating shaft 3, a second rotating shaft 5 rotatably connected to the upper end of the fixed seat 2 via a second support seat, two small gears 6 fixedly connected to the side wall of the second rotating shaft 5, two large gears 7 fixedly connected to the side wall of the first rotating shaft 3, the two small gears 6 meshing with the two large gears 7 respectively, a first motor 13 for driving the small gears 6 to rotate fixedly connected to the side wall of one of the second support seats, and anchor chains 14 provided on both winding rollers 4.

[0022] The winding roller 4 is equipped with a protective mechanism, which includes a friction ring 8 sleeved on the side wall of the winding roller 4. This friction ring acts as a braking friction component, tightening or loosening the winding roller body to achieve deceleration, braking, and locking of the winding roller 4, preventing the anchor chain 14 from accidentally slipping and reversing due to load impact, thus providing safety protection and preventing loss of control. A pull plate 9 is rotatably connected to the upper end of the fixed base 2. A pull rod 10 is coaxially rotatably connected to the side wall of the pull plate 9. A threaded rod 11 is threadedly connected to the side wall of the pull rod 10. Both ends of the friction ring 8 are threadedly connected to the side wall of the threaded rod 11. A handle 12 is fixedly connected to the upper end of the threaded rod 11. The pull plate 9 and the pull rod 10 serve as fulcrums and swing guides, converting the linear clamping force of the threaded rod 11 into a circling and tightening force on the friction ring. This adapts to the opening and closing action of the friction ring, ensuring balanced braking force. It can prevent the anchor chain 14 from getting tangled or loosened, thus reducing the load on the first motor 13. At the same time, it can still manually lock the winding roller in emergency situations such as power failure or motor failure, making up for the poor reliability of traditional electric braking and reducing safety accidents caused by the slippage of the anchor chain 14 and equipment loss of control.

[0023] The base 1 is equipped with a processing mechanism for the anchor chains 14. The processing mechanism includes a cleaning tank 15 fixedly connected to the upper end of the base 1. Two opening slots 16 are symmetrically opened on the upper part of the inner wall of the cleaning tank 15. Two first conveying rollers 17 are installed on the upper part of the inner wall of the cleaning tank 15, and two second conveying rollers 18 are installed on the lower part of the inner wall of the cleaning tank 15. A third conveying roller 19 is installed on the upper end of the fixed seat 2. The side walls of the two anchor chains 14 pass through the two opening slots 16 respectively, and the side walls of the two anchor chains 14 are respectively in contact with the side walls of the first conveying rollers 17, the second conveying rollers 18 and the third conveying rollers 19 (e.g., Figure 3 (As shown).

[0024] A U-shaped plate 20 is slidably connected to the inner wall of the cleaning tank 15. Two connecting plates 21 are symmetrically fixed to the upper and lower sides of the U-shaped plate 20 near the side wall of the anchor chain 14. Multiple brush bristles 22 are fixedly connected to the side walls of the two connecting plates 21 that are close to each other. The side walls of the multiple brush bristles 22 are all in contact with the side walls of the anchor chain 14. The U-shaped plate 20 moves back and forth, so that the brush bristles 22 on the connecting plates 21 continuously brush the surface of the anchor chain 14, remove mud and dirt from the surface of the anchor chain 14, extend its service life, and prevent it from breaking during use.

[0025] A water spray pipe 23 is fixedly connected to the inner wall of the cleaning tank 15 near the third conveyor roller 19. The inner wall of the water spray pipe 23 has multiple water spray holes 24 that are directly opposite the anchor chain. An elastic filter screen 25 is fixedly connected to the inner wall of the cleaning tank 15 below the second conveyor roller 18. A water pump 26 is fixedly connected to the bottom of the cleaning tank 15. The output end of the water pump 26 is fixedly connected to the inner wall of the water spray pipe 23 through the water outlet pipe 27.

[0026] The water pump 26 draws water from the bottom of the cleaning tank 15 and delivers it to the spray pipe 23 through the water outlet pipe 27. The water is then sprayed at high pressure through the spray hole 24 to wash away stubborn impurities on the surface of the anchor chain 14.

[0027] Both second conveyor rollers 18 have permanent magnet blocks 28 fixedly connected to their side walls, and the lower end of the elastic filter screen 25 has two iron blocks 29 that correspond one-to-one with the two permanent magnet blocks 28.

[0028] During the rotation of the second conveying roller 18, the permanent magnet block 28 on its side wall continuously sweeps past the iron block 29. At this time, under the attraction of the permanent magnet block 28, the iron block 29, its own weight, and the elastic force of the elastic filter screen 25, will drive the elastic filter screen 25 to continuously vibrate up and down slightly, thus preventing the elastic filter screen 25 from becoming clogged.

[0029] A horizontal plate 30 is fixedly connected to the side wall of the cleaning box 15 near the third conveyor roller 19. Two cylinders 31 are rotatably connected through the side wall of the horizontal plate 30. Two anchor chains 14 are located in the two cylinders 31 respectively. The outer walls of the two cylinders 31 are provided with a first annular groove 32 and a second annular groove 33. The inner walls of the first annular groove 32 and the second annular groove 33 are provided with multiple rectangular grooves 34.

[0030] A sponge 35 is fixedly connected to the inner wall of the cylinder 31 near the second annular groove 33. A hot air pipe 36 communicating with the inner wall of the two first annular grooves 32 is fixedly connected to the upper end of the horizontal plate 30. An inlet pipe 37 communicating with the inner wall of the two second annular grooves 33 is fixedly connected to the upper end of the horizontal plate 30.

[0031] After the anchor chain 14 is cleaned, it enters the cylinder 31. At this time, hot air is introduced into the first annular groove 32 through the hot air pipe 37 to quickly remove residual moisture on the surface of the anchor chain and inhibit rust formation. Then, the liquid inlet pipe 37 injects protective oil into the second annular groove 33. With the help of the sponge 35, the surface of the anchor chain 14 is evenly coated with oil for maintenance, which improves the anchor chain 14's resistance to seawater and humid environments and extends the service life of the anchor chain 14.

[0032] The side wall of the cleaning tank 15 is rotatably connected to a reciprocating screw 38 via a bracket. The side wall of the reciprocating screw 38 is threadedly connected to the side wall of the U-shaped plate 20. A second motor 39 is fixedly connected to one of the brackets. The output end of the second motor 39 is fixedly connected to one end of the reciprocating screw 38.

[0033] A first synchronous pulley 40 is fixedly connected to the side wall of the reciprocating screw 38 and the side wall of one of the cylinders 31. A synchronous belt is connected between the two first synchronous pulleys 40. A second synchronous pulley 41 is fixedly connected to the side wall of the two cylinders 31. A synchronous belt is connected between the two second synchronous pulleys 41.

[0034] Working principle: Start the first motor 13 to drive the small gear 6 on the second rotating shaft 5 to rotate. The small gear 6 drives the large gear 7 that meshes with it to rotate. The large gear 7 drives the two winding rollers 4 to rotate synchronously through the first rotating shaft 3, thereby realizing the operation of raising and lowering the anchor chain 14. When emergency braking is required or to prevent the anchor chain 14 from accidentally slipping and reversing due to load impact, the operator can manually turn the handle 12 to make the threaded rod 11 move linearly within the pull rod 10. The threaded rod 11 pushes the two ends of the friction ring 8, causing it to grip the surface of the winding roller 4. Relying on friction, the winding roller 4 is decelerated, braked, and locked to prevent the anchor chain 4 from slipping uncontrollably, achieving purely mechanical safety protection. This mechanism can still be manually locked in emergency situations such as power failure or motor failure, making up for the lack of reliability of electrical braking. As the two winding rollers 4 rotate in the forward direction, the two anchor chains 14 are wound onto the two winding rollers 4 in sequence via the first conveying roller 17, the second conveying roller 18 and the third conveying roller 19. At this time, the second motor 39 is driven to rotate, which drives the reciprocating screw 38 to rotate, and drives the U-shaped plate 20 to move back and forth on the inner wall of the cleaning tank 15. This causes the connecting plate 21 to drive the brush bristles 22 to continuously brush the surface of the anchor chain 14 to remove mud and dirt. During the process of removing the anchor chain 14 from the cleaning tank 15 after brushing the side wall, the water pump 26 draws water from the bottom of the cleaning tank 15 and delivers it to the spray pipe 23 through the water outlet pipe 27. The water is sprayed at high pressure through the spray hole 24 to wash away stubborn impurities on the surface of the anchor chain 14. At this time, the filter screen 25 can filter impurities to ensure the cleanliness of the sprayed water. During the rotation of the second conveying roller 18, the permanent magnet block 28 on its side wall continuously sweeps past the iron block 29. At this time, under the attraction of the permanent magnet block 28, the iron block 29, its own weight, and the elastic force of the elastic filter screen 25, will drive the elastic filter screen 25 to continuously vibrate up and down slightly, so as to avoid the elastic filter screen 25 from being blocked. After the anchor chain 14 is cleaned, it will enter the cylinder 31. At this time, the hot air pipe 37 will introduce hot air into the first annular groove 32 to quickly remove the residual moisture on the surface of the anchor chain and inhibit the formation of rust. Then, the liquid inlet pipe 37 will inject protective oil into the second annular groove 33. With the help of the sponge 35, the surface of the anchor chain 14 will be evenly coated with oil for maintenance, which will improve the anchor chain 14's resistance to seawater and humid environment and extend the service life of the anchor chain 14. The reciprocating screw 38 rotates, which drives one of the cylinders 31 to rotate via the first synchronous pulley 40 and the synchronous belt. The cylinder 31 drives the other cylinder 31 to rotate synchronously via the second synchronous pulley 41 and the synchronous belt, so that the anchor chain 14 can be dried and oiled evenly.

[0035] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A safety protection mechanism for a variable frequency anchor winch, characterized in that, The device includes a base, a fixed seat fixedly connected to the upper end of the base, a first rotating shaft rotatably connected to the upper end of the fixed seat via a first support seat, two winding rollers fixedly connected to the side wall of the first rotating shaft, a second rotating shaft rotatably connected to the upper end of the fixed seat via a second support seat, two small gears fixedly connected to the side wall of the second rotating shaft, and two large gears fixedly connected to the side wall of the first rotating shaft. The two small gears mesh with the two large gears respectively. A first motor for driving the small gears to rotate is fixedly connected to the side wall of one of the second support seats. A protective mechanism is provided on the winding rollers. The protective mechanism includes a friction ring sleeved on the side wall of the winding roller, a pull plate rotatably connected to the upper end of the fixed seat, a pull rod rotatably connected to the side wall of the pull plate, a threaded rod threadedly connected to the side wall of the pull rod, the side walls of both ends of the friction ring being threadedly connected to the side walls of the threaded rod, a handle being fixedly connected to the upper end of the threaded rod, and anchor chains being provided on both winding rollers.

2. The safety protection mechanism for a variable frequency anchor winch according to claim 1, characterized in that: The base is equipped with a processing mechanism for anchor chain treatment. The processing mechanism includes a cleaning box fixedly connected to the upper end of the base. Two opening slots are symmetrically opened on the upper part of the inner wall of the cleaning box. Two first conveying rollers are installed on the upper part of the inner wall of the cleaning box, and two second conveying rollers are installed on the lower part of the inner wall of the cleaning box. A third conveying roller is installed on the upper end of the fixed seat. The two side walls of the anchor chain pass through the two opening slots respectively, and the two side walls of the anchor chain are respectively attached to the side walls of the first conveying roller, the second conveying roller and the third conveying roller.

3. The safety protection mechanism for a variable frequency anchor winch according to claim 2, characterized in that: The inner wall of the cleaning tank is slidably connected to a U-shaped plate. Two connecting plates are symmetrically fixedly connected to the side wall of the U-shaped plate near the anchor chain. Multiple brush bristles are fixedly connected to the side walls of the two connecting plates that are close to each other. The side walls of the multiple brush bristles are all in contact with the side wall of the anchor chain.

4. The safety protection mechanism for a variable frequency anchor winch according to claim 2, characterized in that: A water spray pipe is fixedly connected through the inner wall of the cleaning box near the third conveyor roller. The inner wall of the water spray pipe has multiple water spray holes that are directly opposite the anchor chain. An elastic filter screen is fixedly connected to the inner wall of the cleaning box below the second conveyor roller. A water pump is fixedly connected to the bottom of the cleaning box. The output end of the water pump is fixedly connected to the inner wall of the water spray pipe through a water outlet pipe.

5. A safety protection mechanism for a variable frequency anchor winch according to claim 4, characterized in that: Both of the second conveying rollers are fixedly connected to permanent magnet blocks on their sidewalls, and the lower end of the elastic filter screen is fixedly connected to two iron blocks that correspond one-to-one with the two permanent magnet blocks.

6. The safety protection mechanism for a variable frequency anchor winch according to claim 3, characterized in that: A horizontal plate is fixedly connected to the side wall of the cleaning box near the third conveying roller. Two cylinders are rotatably connected through the side wall of the horizontal plate. The two anchor chains are located in the two cylinders respectively. The outer walls of the two cylinders are provided with a first annular groove and a second annular groove. The inner walls of the first annular groove and the second annular groove are provided with multiple rectangular grooves.

7. A safety protection mechanism for a variable frequency anchor winch according to claim 6, characterized in that: A sponge is fixedly connected to the inner wall of the cylinder near the second annular groove. A hot air pipe communicating with the inner walls of the two first annular grooves is fixedly connected to the upper end of the horizontal plate. An inlet pipe communicating with the inner walls of the two second annular grooves is fixedly connected to the upper end of the horizontal plate.

8. A safety protection mechanism for a variable frequency anchor winch according to claim 6, characterized in that: The side wall of the cleaning tank is rotatably connected to a reciprocating screw via a bracket. The side wall of the reciprocating screw is threadedly connected to the side wall of the U-shaped plate. One of the brackets is fixedly connected to a second motor, and the output end of the second motor is fixedly connected to one end of the reciprocating screw.

9. A safety protection mechanism for a variable frequency anchor winch according to claim 8, characterized in that: The reciprocating screw sidewall and one of the cylindrical sidewalls are fixedly connected to a first synchronous pulley, and a synchronous belt is connected between the two first synchronous pulleys. The two cylindrical sidewalls are fixedly connected to a second synchronous pulley, and a synchronous belt is connected between the two second synchronous pulleys.

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