High-capacity solid-liquid efficient separation device for chemical industry

Abstract

The high-capacity chemical solid-liquid efficient separation device comprises a cylindrical shell, a filtering layer and a stirring mechanism, a discharging opening is formed in the middle of the horizontal side of the cylindrical shell, and a sealing cover for sealing the discharging opening is arranged on the discharging opening; the material collecting mechanism comprises two sliding rails, material collecting plates connected to the sliding rails in a sliding mode and a driving mechanism for driving the two material collecting plates to be close to or away from each other. The two sliding rails are arranged on the two sides of the inner wall of the cylindrical shell, one sliding rail is located on the side close to the discharging port, the other sliding rail is arranged on the side away from the discharging port, and the length direction of the sliding rails is parallel to the axis of the cylindrical shell; the two material collecting plates are located at the two axial ends in the cylindrical shell, the two ends of the material collecting plates are slidably connected to the two sliding rails, and the bottom ends of the material collecting plates abut against the top face of the filtering layer. According to the scheme, solid components are concentrated at the position right opposite to the discharging opening through the material collecting plate and then discharged, workers do not need to enter the cylindrical shell for operation, the solid components are conveniently concentrated, discharging is convenient, and harm of solvents to the workers is reduced.

Description

Technical Field

[0001] The present application relates to the field of separation equipment, and in particular to a large-capacity chemical solid-liquid high-efficiency separation device. Background Art

[0002] For a long time, solid-liquid separation has been a frequent operation in chemical production. Therefore, filtration equipment is very important in this operation. Zeolite is a special porous silicate mineral with a regular network channel system. This structure gives zeolite catalysts excellent catalytic properties. Zeolite and liquid components need to be separated when zeolite is recovered.

[0003] Therefore, a solid-liquid separation device was developed, including a horizontally arranged cylindrical shell, a filter layer horizontally arranged in the shell, a stirring paddle arranged above the filter layer, a discharge port arranged below the filter layer in the cylindrical shell, and a discharge port for the solid component to be discharged at a position above the filter layer on the side wall of the cylindrical shell. During separation, the solid-liquid mixture is placed in the cylindrical shell, the liquid component is discharged through the discharge port, and then a solvent is added for washing. The stirring paddle is turned on to wash the reaction product remaining on the zeolite, and then discharged into the reaction stock solution through the discharge port to improve the yield. The stirring paddle stirs to make the reaction product remaining on the zeolite more fully washed, and the zeolite component is located on the filter layer, thereby achieving solid-liquid separation.

[0004] However, the zeolite is laid flat on the filter layer and the laying area is large. When unloading, the zeolite on the filter layer needs to be manually concentrated at the discharge port, which requires workers to partially enter the cylindrical shell from the discharge port to operate, resulting in inconvenience in unloading. Solvents are usually corrosive liquids with pungent odors, which affect the health of workers. Summary of the invention

[0005] In order to facilitate the discharge of solid components, the present application provides a large-capacity chemical solid-liquid high-efficiency separation device.

[0006] The present application provides a large-capacity chemical solid-liquid efficient separation device, which adopts the following technical solution: A high-efficiency solid-liquid separation device for large-capacity chemical industry, comprising a horizontally arranged cylindrical shell, a filter layer in the cylindrical shell and a stirring mechanism above the filter layer, a discharge port is arranged in the middle of a horizontal side of the cylindrical shell, and a sealing cover for closing the discharge port is arranged on the discharge port; it also comprises a collection mechanism, the collection mechanism comprises two slide rails, a collection plate slidably connected to the slide rails and a driving mechanism for driving the two collection plates to approach or move away from each other; the two slide rails are arranged on both sides of the inner wall of the cylindrical shell, one slide rail is located on the side close to the discharge port, and the other is arranged on the side away from the discharge port, and the length direction of the slide rail is parallel to the axis of the cylindrical shell; the two collection plates are located at the two axial ends of the cylindrical shell, and the two ends of the collection plates are slidably connected to the two slide rails, and the bottom end of the collection plate abuts against the top surface of the filter layer; A discharge pipe is provided at the bottom of the cylindrical shell, and the discharge pipe is located below the filter layer.

[0007] By adopting the above technical solution, when the solid components and the solvent are stirred, the two collecting plates are located at both ends of the inner cavity of the cylindrical shell and are close to the inner wall of the cylindrical shell, and the solid-liquid mixture rolls between the two collecting plates. When it is necessary to discharge the material, the liquid component is discharged from the bottom of the cylindrical shell, and then the discharge port is opened. The driving mechanism drives the two collecting plates to approach each other. After the collecting plates gather the solid components on the filter layer to face the discharge port, the workers take out the solid components from the discharge port.

[0008] In the present application, it is convenient to separate liquid and solid in large quantities. When a large amount of solid components are accumulated, a solvent is added to wash the solid components. The residual product on the solid components is washed into the solvent and then mixed into the separated stock solution for further reaction, thereby improving the yield of the product. The solid components are concentrated at the point opposite to the discharge port through the collecting plate and then discharged. There is no need for workers to enter the cylindrical shell for operation, which makes it convenient to concentrate the solid components, make it convenient to discharge, and reduce the harm of the solvent to the workers.

[0009] Optionally, the aggregate plate includes a main board and an abutment plate at the bottom of the main board, both ends of the main board are slidably connected to the slide rail, a sliding groove is provided at the bottom of the main board, the abutment plate is slidably arranged in the sliding groove, and the sliding direction of the abutment plate is a direction away from or close to the top surface of the filter layer; an abutment spring is provided at the bottom of the sliding groove, and the abutment spring drives the abutment plate to press against the filter layer.

[0010] By adopting the above technical solution, the abutment plate is pressed against the top of the filter layer through the abutment spring. On the one hand, the abutment plate maintains a good abutment force on the filter layer, which is convenient for scraping the solid components above the filter layer, and at the same time, it is not easy to damage the filter layer.

[0011] Optionally, edges of the bottom ends of the two abutment plates on a side away from each other are chamfered.

[0012] By adopting the above technical scheme, when the abutment plates slide away from each other and reset, if there are missed solid components on the filter layer, the solid components can easily slide up the abutment plates through the abutment chamfers, so that the solid components are not easily reset and are driven to slide and get stuck between the collecting plate and the inner wall of the cylindrical shell, resulting in a gap between the collecting plate and the inner wall of the cylindrical shell. During the next solid component recovery and stirring, more solid components will enter the gap, making it difficult to discharge the material.

[0013] Optionally, the driving mechanism includes a forward and reverse screw and a driving motor for driving the forward and reverse screw forward and reverse rotations, the two ends of the forward and reverse screw are rotatably connected to the cylindrical shell, the forward and reverse screw are parallel to the slide rail, and the two main boards are threadedly connected to the two ends of the forward and reverse screw.

[0014] By adopting the above technical solution, the gas cutting drive motor is used as a drive source to drive the two main boards to move, thereby saving energy.

[0015] Optionally, two forward and reverse threaded screws are provided, and the two ends of the top of the main board are threadedly connected to the forward and reverse threaded screws, and the two ends of the bottom of the main board are slidably connected to the slide rails.

[0016] By adopting the above technical solution, two positive and negative screws are located on both sides of the top of the two main boards, and two slide rails are located on both sides of the bottom of the two main boards, so that the sliding direction of the four corners of the main board is positioned, so that the sliding of the main board is stable. Since the positive and negative screws are located on the top of the two main boards, the bottom of the main board is easy to deviate. If the abutment plate is not set, there is a gap between the bottom of the main board and the filter layer, and the solid components are easy to leak out from the gap, resulting in poor scraping effect, so it is necessary to slide the abutment plate to keep the abutment plate abutting on the filter layer.

[0017] Optionally, the height of the positive and negative threaded rods is 30-100 cm higher than the top surface of the filter layer.

[0018] By adopting the above technical solution, the solid components can be conveniently discharged from below the positive and negative threaded screws, and the positive and negative threaded screws are not likely to block the discharge.

[0019] Optionally, the height of the forward and reverse screw rods is higher than the top of the discharge port.

[0020] By adopting the above technical solution, the material outlet will not be blocked by the positive and negative threaded screws, so that the material outlet is completely open and the positive and negative threaded screws are not likely to hinder the material outlet.

[0021] Optionally, a slider is slidably arranged on the slide rail, the bottom end of the mainboard is arranged on the slider, and the thickness of the slider is greater than the thickness of the mainboard.

[0022] By adopting the above technical solution, the slider is thickened, so that the sliding of the slider is more stable and the aggregate plate is not easy to deviate during sliding.

[0023] Optionally, the top surface of the collecting plate is an inclined surface, and the inclined surfaces at the top ends of the two collecting plates point downward in a direction approaching each other.

[0024] By adopting the above scheme, the solid part is not easy to remain on the top of the aggregate plate when the solid-liquid mixture is stirred. If the top surface of the aggregate plate is set as a horizontal plane, solid components are likely to remain on the top of the aggregate plate, resulting in the solid components falling between the aggregate plate and the inner wall of the cylindrical shell when the aggregate plates slide close to each other. After the aggregate plates move away from each other and reset, they are stuck between the aggregate plate and the inner wall of the cylindrical shell, resulting in a gap between the aggregate plate and the inner wall of the cylindrical shell. When the solid-liquid mixture is stirred next time, more solid components enter the gap, causing difficulty in discharging.

[0025] Optionally, the drive motor drives two forward and reverse screws to rotate simultaneously by setting up a pulley structure, and the pulley structure includes two transmission wheels and a transmission belt. The transmission wheels are coaxially connected to a forward and reverse screw one by one, and the transmission belt is tensioned to connect the two transmission wheels, and the drive motor drives one of the transmission wheels to rotate.

[0026] By adopting the above technical solution, the two screw rods are driven by a pulley to rotate synchronously, which has a simple structure and ensures the consistency of the rotation of the two screw rods.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The solid components are concentrated at the place opposite to the discharge port through the collecting plate and then discharged. There is no need for workers to enter the cylindrical shell to operate, which makes it convenient to concentrate the solid components, make the discharge convenient, and reduce the harm of solvents to workers; 2. The abutment plate is pressed against the filter layer through the abutment spring. On the one hand, the abutment plate maintains a good abutment force on the filter layer, and at the same time, it is not easy to damage the filter layer; 3. When the abutment plates slide away from each other and reset, the solid components left on the filter layer slide up on the abutment plates through the abutment chamfers, so that the solid components are not easily driven to slide by the abutment plates that are reset and get stuck between the collecting plate and the inner wall of the cylindrical shell; 4. Two positive and negative screw rods are located on both sides of the top of the two main boards, and two slide rails are located on both sides of the bottom of the two main boards, so that the sliding direction of the four corners of the main board is positioned, and the two sliders are thickened to make the main board slide stably; 5. The height of the positive and negative threaded screw is higher than the top of the discharge port, so that the discharge port will not be blocked by the positive and negative threaded screw, so that the discharge port is completely open and the positive and negative threaded screw is not easy to hinder the discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of a large-capacity chemical solid-liquid efficient separation device according to an embodiment.

[0029] Figure 2 It is a diagram showing the structure inside the cylindrical shell of the embodiment.

[0030] Figure 3 It is a cross-sectional view of the aggregate plate and the filter layer of the embodiment, mainly showing the structure of the main plate and the abutment plate.

[0031] Figure 4 yes Figure 3 The enlarged view of point A mainly shows the structure of the main board and the abutment plate.

[0032] Figure 5 yes Figure 2 An enlarged view of point B.

[0033] Explanation of the reference numerals in the accompanying drawings: 1. support frame; 2. cylindrical shell; 21. discharge pipe; 22. feed port; 23. feed cover; 24. discharge port; 25. sealing cover; 3. filter layer; 4. stirring mechanism; 41. stirring paddle; 411. main shaft; 412. paddle; 42. stirring motor; 5. collection mechanism; 51. slide rail; 52. collection plate; 521. main board; 5211. slide groove; 522. abutment plate; 5221. chamfer; 523. abutment spring; 53. driving mechanism; 531. positive and negative screw rods; 532. driving motor; 533. pulley structure; 5331. transmission wheel; 5332. transmission belt; 54. slider. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] The present application discloses a large-capacity chemical solid-liquid high-efficiency separation device. Figure 1 The high-efficiency solid-liquid separation device for large-capacity chemical industry comprises a support frame 1, a horizontally arranged cylindrical shell 2, a filter layer 3 in the cylindrical shell 2, and a stirring mechanism 4 above the filter layer 3. The filter layer 3 is arranged horizontally, and the filter layer 3 divides the inner cavity of the cylindrical shell 2 into two upper and lower chambers. A discharge pipe 21 is provided at the bottom of the cylindrical shell 2, and the discharge pipe 21 is located below the filter layer 3. The discharge pipe 21 is used for discharging liquid components, and a valve (not shown in the figure) is connected to the discharge pipe 21 to control the opening and closing of the discharge pipe 21. The filter layer 3 intercepts the solid components in the upper chamber.

[0036] Reference Figure 1 A feed port 22 is provided at the top of the cylindrical housing 2, and a feed cover 23 is installed on the feed port 22. A discharge port 24 is provided in the middle of the horizontal side of the cylindrical housing 2, and a sealing cover 25 for closing the discharge port 24 is rotatably connected to the discharge port 24, and the sealing cover 25 is detachable. The bottom of the discharge port 24 is flush with the filter layer 3, which is convenient for the discharge of solid components. A fixing piece is provided on the sealing cover 25 for fixing the sealing cover 25 in a state of closing the discharge port 24.

[0037] Reference Figure 1 , Figure 2 The stirring mechanism 4 includes a stirring paddle 41 and a stirring motor 42 for driving the stirring paddle 41 to rotate. The stirring paddle 41 includes a main shaft 411 and a paddle 412. Both ends of the main shaft 411 are rotatably connected in the cylindrical shell 2. The stirring motor 42 is fixed on the support frame 1, and the motor shaft of the stirring motor 42 is coaxially fixed with the main shaft 411.

[0038] Reference Figure 1 , Figure 2The high-efficiency solid-liquid separation device for large-capacity chemical industry also includes a collection mechanism 5, which includes two slide rails 51, a collection plate 52 slidably connected to the slide rails 51, and a driving mechanism 53 that drives the two collection plates 52 to move closer to or away from each other. The two slide rails 51 are fixed to both sides of the inner wall of the cylindrical shell 2, and the length direction of the slide rails 51 is parallel to the axis of the cylindrical shell 2. One slide rail 51 is fixed to the side close to the discharge port 24, and the other is fixed to the side away from the discharge port 24. The top surface of the slide rail 51 is flush with the top surface of the filter layer 3. The two collection plates 52 are located at both ends of the axial direction in the cylindrical shell 2, and the two ends of the collection plates 52 are slidably connected to the two slide rails 51. A slider 54 is slidably connected to the slide rail 51, and the bottom end of the collection plate 52 is fixed to the slider 54. The thickness of the slider 54 is greater than the thickness of the collection plate 52.

[0039] Reference Figure 1 , Figure 3 , Figure 4 The material collecting plate 52 includes a main board 521 and an abutting plate 522 at the bottom of the main board 521. The two ends of the bottom of the main board 521 are fixed to the slider 54. The two ends of the main board 521 are slidably connected to the slide rail 51 through the slider 54. A sliding groove 5211 is provided at the bottom of the main board 521. The abutting plate 522 is slidably connected in the sliding groove 5211. The sliding direction of the abutting plate 522 is the direction away from or close to the top surface of the filter layer 3, and the sliding direction of the abutting plate 522 is the vertical direction. The two ends of the abutting plate 522 are in contact with the slider 54, so that it is not easy to leak material at the gap. An abutting spring 523 is fixed in the sliding groove 5211. The abutting spring 523 drives the abutting plate 522 to press against the top surface of the filter layer 3, so that the bottom end of the material collecting plate 52 abuts against the top surface of the filter layer 3.

[0040] Reference Figure 1 , Figure 3 , Figure 4 The edges of the two abutment plates 522 on the side away from each other at the bottom end are provided with chamfers 5221, so that when the collecting plates 52 slide away from each other, the abutment plates 522 pass over the solid components, making it difficult for the solid components to move with the abutment plates 522, and making it difficult for the solid components to get stuck between the collecting plates 52 and the inner wall of the cylindrical shell 2. The tops of the two main boards 521 are inclined surfaces, and the inclined surfaces of the tops of the two collecting plates 52 face downward in the direction of approaching each other, so as to prevent the materials from accumulating on the tops of the main boards 521, resulting in the solid components falling between the collecting plates 52 and the inner wall of the cylindrical shell 2 after the collecting plates 52 move. If there is a gap between the collecting plates 52 and the inner wall of the cylindrical shell 2, more solid components will enter the gap during the next solid component recovery and stirring, making it difficult to discharge the materials.

[0041] Reference Figure 5The driving mechanism 53 includes two positive and negative threaded rods 531, a driving motor 532 and a group of pulley structures 533. Both ends of the positive and negative threaded rods 531 are rotatably connected to the cylindrical housing 2, and the length direction of the positive and negative threaded rods 531 is parallel to the length direction of the slide rail 51.

[0042] Reference Figure 1 , Figure 5 The pulley structure 533 includes two transmission wheels 5331 and a transmission belt 5332. The transmission wheels 5331 are coaxially connected to the ends of the positive and negative threaded rods 531 protruding from the outer side of the cylindrical shell 2 in a one-to-one correspondence. The transmission belt 5332 is tensioned to connect the two transmission wheels 5331. The driving motor 532 is fixed to the support frame 1. The motor shaft of the driving motor 532 is coaxially fixed to one of the transmission wheels 5331 to drive one of the transmission wheels 5331 to drive, so that the driving motor 532 drives the two positive and negative threaded rods 531 to rotate simultaneously through the pulley structure 533.

[0043] Reference Figure 1 , Figure 5 , the two main boards 521 are fixed to the two ends of the length direction of the two positive and negative threaded rods 531, the two ends of the top of the main board 521 are threadedly connected to the positive and negative threaded rods 531, and the sliders 54 are fixed at the bottom of the two ends of the main board 521 to slide and connect the slide rails 51. The height of the positive and negative threaded rods 531 is 30-100cm higher than the top surface of the filter layer 3, and the height of the positive and negative threaded rods 531 is higher than the top of the discharge port 24. In the embodiment, the height of the positive and negative threaded rods 531 is 50cm higher than the top surface of the filter layer 3. When discharging, the solid components are discharged from the bottom of the positive and negative threaded rods 531 and the top of the filter layer 3, and the positive and negative threaded rods 531 will not hinder the solid components from being discharged from the discharge port 24.

[0044] The implementation principle of a large-capacity high-efficiency solid-liquid separation device for chemical use in an embodiment of the present application is as follows: after the reaction is completed, solid-liquid separation is required, the solid-liquid mixture enters the cylindrical shell 2 from the feed inlet 22, the liquid component is discharged from the discharge pipe 21, and then the solvent material is added, and the stirring motor 42 drives the stirring paddle 41 to rotate. The rotation speed of the stirring paddle should not be too fast, and the rotation speed is 45r / min, so that the reaction product remaining on the solid component is dissolved in the solvent, and then the solution component containing a certain concentration of the reaction product is discharged from the discharge pipe 21, and the other end of the discharge pipe 21 can be connected to a suction device to accelerate filtration. Then open the discharge port 24, drive the motor 532 to drive the two positive and negative screw rods 531 to rotate simultaneously through the pulley structure 533, so that the collecting plates 52 slide close to each other, and the bottom of the abutment plate 522 scrapes the solid components on the filter layer 3. Zeolite is granular, which is convenient for scraping, so that the solid materials are accumulated at the place opposite the discharge port 24. While unloading, the two collecting plates 52 are moved close to each other, so that the materials between the two collecting plates 52 are not too much, and the stress on the two collecting plates 52 is reduced. The positive and negative screw rods 531 are located above the discharge port 24 and will not hinder the discharge of materials. The solid components are conveniently unloaded from the discharge port 24. After unloading, the two collecting plates 52 are moved away from each other and reset.

[0045] In the present application, the collecting plate 52 collects the solid components at the position opposite to the discharge port 24 for discharge, and workers do not need to enter the cylindrical shell 2 for operation, which makes it convenient to collect the solid components, make discharge convenient, and reduce the harm of solvents to workers.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-efficiency solid-liquid separation device for large-capacity chemical industry, comprising a horizontally arranged cylindrical shell (2), a filter layer (3) in the cylindrical shell (2), and a stirring mechanism (4) above the filter layer (3), a discharge port (24) is arranged in the middle of a horizontal side of the cylindrical shell (2), and a sealing cover (25) for closing the discharge port (24) is arranged on the discharge port (24); characterized in that: It also includes a material collecting mechanism (5), the material collecting mechanism (5) including two slide rails (51), a material collecting plate (52) slidably connected to the slide rails (51), and a driving mechanism (53) for driving the two material collecting plates (52) to move closer to or farther from each other; the two slide rails (51) are arranged on both sides of the inner wall of the cylindrical shell (2), one slide rail (51) is located on the side close to the material discharge port (24), and the other is arranged on the side away from the material discharge port (24), and the length direction of the slide rail (51) is parallel to the axis of the cylindrical shell (2); the two material collecting plates (52) are located at the two axial ends inside the cylindrical shell (2), the two ends of the material collecting plates (52) are slidably connected to the two slide rails (51), and the bottom end of the material collecting plate (52) abuts against the top surface of the filter layer (3); A discharge pipe (21) is provided at the bottom of the cylindrical housing (2), and the discharge pipe (21) is located below the filter layer (3).

2. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 1, characterized in that: The collecting plate (52) comprises a main board (521) and an abutment plate (522) at the bottom of the main board (521); both ends of the main board (521) are slidably connected to the slide rail (51); a sliding groove (5211) is provided at the bottom of the main board (521); the abutment plate (522) is slidably arranged in the sliding groove (5211); the sliding direction of the abutment plate (522) is a direction away from or close to the top surface of the filter layer (3); an abutment spring (523) is provided at the bottom of the sliding groove (5211); the abutment spring (523) drives the abutment plate (522) to press against the filter layer (3).

3. A large-capacity chemical solid-liquid high-efficiency separation device according to claim 2, characterized in that: The edges of the bottom ends of the two abutting plates (522) that are away from each other are provided with chamfers (5221).

4. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 2, characterized in that: The driving mechanism (53) comprises a forward and reverse threaded rod (531) and a driving motor (532) for driving the forward and reverse threaded rod (531) to rotate forward and reverse, the two ends of the forward and reverse threaded rod (531) are rotatably connected to the cylindrical housing (2), the forward and reverse threaded rod (531) is parallel to the slide rail (51), and the two main boards (521) are threadedly connected to the two ends of the forward and reverse threaded rod (531).

5. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 4, characterized in that: Two forward and reverse threaded rods (531) are provided, and the top two ends of the main board (521) are threadedly connected to the forward and reverse threaded rods (531), and the bottom two ends of the main board (521) are slidably connected to the slide rails (51).

6. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 5, characterized in that: The height of the positive and negative threaded rods (531) is 30-100 cm higher than the top surface of the filter layer (3).

7. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 5, characterized in that: The height of the positive and negative threaded rods (531) is higher than the top of the discharge port (24).

8. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 5, characterized in that: A slider (54) is slidably arranged on the slide rail (51), the bottom end of the main board (521) is arranged on the slider (54), and the thickness of the slider (54) is greater than the thickness of the main board (521).

9. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 1, characterized in that: The top surface of the material collecting plate (52) is an inclined surface, and the inclined surfaces at the top ends of the two material collecting plates (52) point downward in a direction approaching each other.

10. A high-efficiency solid-liquid separation device for large-capacity chemical industry according to claim 4, characterized in that: The driving motor (532) drives the two forward and reverse screw rods (531) to rotate simultaneously by setting a pulley structure (533); the pulley structure (533) comprises two transmission wheels (5331) and a transmission belt (5332); the transmission wheels (5331) are coaxially connected to a forward and reverse screw rod (531) in a one-to-one correspondence; the transmission belt (5332) is tensioned to connect the two transmission wheels (5331); and the driving motor (532) drives one of the transmission wheels (5331) to rotate.

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