A cell transfection device

Abstract

The present invention provides a cell transfection device, which relates to the technical field of cell transfection equipment and includes: an upper swing seat, a lower connecting slide column frame, a different-tooth driving wheel, and a middle scissors frame. A lower connecting slide column frame is arranged below the upper swing seat, a different-tooth driving wheel is arranged inside the lower connecting slide column frame, a middle scissors frame is arranged above the different-tooth driving wheel, a middle threaded rod rotates at the lower part of the lower connecting slide column frame, a lower rotating frame slides at the lower part of the lower connecting slide column frame, a lower gear is fixed to the lower part of the lower rotating frame, and the lower rotating frame is screwed to the middle threaded rod. By expanding or shortening the distance between the lower connecting slide column frame and the lower rotating frame, the adjustment of the reciprocating movement distance of the chute frame driven by the lower connecting slide column frame is realized, and the adjustment of the shaking amplitude of the upper swing seat is realized, so as to solve the problem that too large a displacement distance will cause the solution in the culture medium to move too far and attach to the inner vertical wall of the culture medium, and the solution cannot be evenly distributed at the bottom of the culture medium.

Description

Technical Field

[0001] The present invention relates to the technical field of cell transfection equipment, and in particular to a cell transfection device. Background Art

[0002] Cell transfection is to introduce exogenous molecules such as DNA, RNA, etc. into eukaryotic cells. During the cell transfection process, cells need to be mixed with a mixture of configured siRNA and transfection reagent and mixed evenly.

[0003] In order to ensure the final effect of cell transfection, the siRNA and transfection reagent mixture and cells need to be evenly mixed. Existing devices move reciprocally at a fixed distance and can only adjust the moving frequency during mixing by the rotation frequency of the motor. However, when mixing a culture medium with a smaller diameter, due to the small diameter of the culture medium, the large fixed distance of the device will cause the internal movement distance of the culture medium to be too large, and the solution will adhere to the inner side wall of the culture medium, and the solution cannot be evenly distributed at the bottom of the culture medium, reducing the mixing effect of cell transfection. Summary of the Invention

[0004] Embodiments of the present disclosure relate to a cell transfection device. The different-tooth drive wheel meshes alternately to drive the lower gears on both sides to rotate, realizing the cross-method shaking and mixing operation of the upper swing seat and the culture medium related to cell transfection synchronously in the horizontal front, back, left, and right directions. By expanding or shortening the distance through the lower connecting slide column frame and the lower rotating frame, the reciprocating movement distance of the lower connecting slide column frame driving the lower chute frame is adjusted, and the shaking amplitude of the upper swing seat is adjusted. Different shaking amplitudes are adjusted according to needs to ensure that the cell solution is evenly distributed at the bottom of the culture medium.

[0005] In the first aspect of the present invention, a cell transfection device is provided, which specifically includes an upper swing seat, a lower connecting slide column frame, a different-tooth drive wheel, and a middle scissors frame. The lower connecting slide column frame is arranged below the upper swing seat, the different-tooth drive wheel is arranged inside the lower connecting slide column frame, the middle scissors frame is arranged above the different-tooth drive wheel, and the middle scissors frame is located below the upper swing seat. Side connecting slide frames slide horizontally on the four sides of the upper swing seat. A lower chute frame is arranged at the bottom of the upper swing seat. An outer support spring is fixed outside the side connecting slide frame. The cylinder on the back of the side connecting slide frame is horizontally slidably connected to the upper part of the outer support slide frame. The lower part of the outer support slide frame is horizontally slidably connected to the lower fixed base. A lower connecting rack is fixed at the end of the outer support slide frame. The lower connecting rack meshes with the middle transmission gear. When the upper swing seat moves back and forth, the middle eccentric cam at the lower part of the lower connecting slide column frame pushes the right outer support slide frame to move. The outer support slide frames on the left and right sides move closer to the outer support spring, and the outer support spring increases the supporting force on the side connecting slide frames of the upper swing seat on the left and right sides.

[0006] In at least some embodiments, a middle threaded rod rotates at the lower part of the lower connecting sliding post frame. A lower rotating frame with an L-shaped structure slides in a square tube at the lower part of the lower connecting sliding post frame, and a lower gear is fixed to the lower part of the lower rotating frame.

[0007] In at least some embodiments, the lower rotating frame is screwed to the middle threaded rod, the lower rotating frame is rotatably connected to the lower fixed base, the lower sliding groove frame slides on the upper part of the lower connecting sliding post frame. The length of the sliding groove of the lower sliding groove frame is twice the moving range of the lower connecting sliding post frame. The lower sliding groove frame leaves enough redundancy for front-back movement when stopping left and right. When the lower connecting sliding post frame rotates circumferentially around the connection between the lower rotating frame and the lower fixed base, the lower sliding groove frame moves horizontally back and forth, and the upper swing seat moves back and forth or horizontally.

[0008] In at least some embodiments, middle eccentric cams are eccentrically arranged on both the upper and lower parts of the different-tooth driving wheel, and the center of the different-tooth driving wheel is fixedly connected to the main shaft of the driving motor.

[0009] In at least some embodiments, the driving motor is fixedly connected to the lower fixed base. A sector gear smaller than a semi-circle is arranged outside the different-tooth driving wheel. Lower gears and lower connecting sliding post frames are arranged on both sides of the different-tooth driving wheel. The sector gear outside the different-tooth driving wheel meshes with the lower gears on both sides alternately. The sector gear of the different-tooth driving wheel can only mesh with one lower gear at a time. The different-tooth driving wheel rotates in turn to drive the lower gears on both sides to rotate, and the sector gear of the different-tooth driving wheel produces an interval where neither of the two lower gears is meshed.

[0010] In at least some embodiments, side sliding groove frames are slidably connected to both sides of the middle scissors frame, and a middle sliding groove frame is slidably connected to one side in the middle of the middle scissors frame. The outer support sliding frames before and after in the middle realize synchronous opposite movement through the middle scissors frame, and the height of the side sliding groove frame is higher than that of the lower rotating frame.

[0011] In at least some embodiments, the center of the middle transmission gear is rotatably connected to the lower fixed base. Lower connecting racks are meshed on both sides of the middle transmission gear. The tail end of the outer support sliding frame on the right slides and fits with the middle eccentric cam at the lower part of the different-tooth driving wheel. The middle sliding groove frame slides and fits with the middle eccentric cam at the upper part of the different-tooth driving wheel. The middle eccentric cam pushes the middle sliding groove frame to move outward. The middle sliding groove frame drives the middle scissors frame to expand towards both left and right sides. The two side sliding groove frames move closer. The outer support sliding frames connected to the side sliding groove frames move closer to the outer support spring. The outer support sliding frame presses the outer support spring, and the outer support spring increases the supporting force on the side connecting sliding frame in the middle of the upper swing seat.

[0012] In at least some embodiments, the side chute frame and the outer support slide frame before and after the middle of the upper swing seat are fixedly connected, the middle eccentric cam and the sector gear on the outside of the different-tooth drive wheel are arranged in the same direction. When the different-tooth drive wheel meshes with the right lower gear, the outer support slide frames on the left and right move reciprocally, and the outer support slide frames before and after the middle move closer to the lower connecting slide column frame. The outer support slide frame presses the outer support spring, and the outer support spring increases the supporting force on the side connecting slide frame in the middle of the upper swing seat.

[0013] The present invention provides a cell transfection device, which has the following beneficial effects:

[0014] 1. The different-tooth drive wheel rotates in turn to drive the lower gears on both sides to rotate, realizing the cross-method shaking and mixing operation of the upper swing seat and the cell transfection-related culture medium synchronously in the horizontal front, back, left, and right directions. The sector gear of the different-tooth drive wheel generates a non-meshing interval for the lower gears on both sides for static operation, fully ensuring that the culture medium is evenly spread.

[0015] 2. When the upper swing seat moves left and right, the middle eccentric cam pushes the middle chute frame to move outward. The outer support slide frames before and after the middle of the upper swing seat move closer to press the outer support spring. The inertial movement in the front and back directions before the left and right movement of the upper swing seat is stopped, avoiding the simultaneous front and back movement while the upper swing seat moves left and right, and ensuring the accuracy of the cross-method shaking and mixing operation.

[0016] 3. By expanding or shortening the distance between the lower connecting slide column frame and the lower rotating frame, the reciprocating movement distance of the lower chute frame driven by the lower connecting slide column frame is adjusted, and the shaking amplitude of the upper swing seat is adjusted. Different shaking amplitudes can be adjusted according to needs to ensure that the cell solution is evenly distributed at the bottom of the culture medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0018] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the drawings:

[0020] Figure 1 A schematic diagram showing the overall structure of the present application is shown;

[0021] Figure 2 A schematic diagram showing the cross-sectional structure of the lower fixed base of the present application is shown;

[0022] Figure 3 A schematic diagram showing the cross-sectional structure of the upper swing seat of the present application is shown;

[0023] Figure 4Shows a schematic structural diagram of the state where the outer support carriage near the middle of the upper swing seat of the present application is close to the side connection carriage;

[0024] Figure 5 Shows a schematic structural diagram of the lower connecting rack of the present application;

[0025] Figure 6 Shows a schematic structural diagram of the cross-section of the lower connecting slide column frame of the present application;

[0026] Figure 7 Shows a schematic structural diagram of the middle scissor frame of the present application;

[0027] Figure 8 Shows a schematic structural diagram of the different-tooth drive wheel of the present application.

[0028] List of reference numerals

[0029] 1. Upper swing seat; 101. Lower chute frame; 102. Side connection carriage; 103. Outer support spring; 104. Outer support carriage; 105. Lower fixed base; 106. Lower connecting rack; 107. Middle transmission gear;

[0030] 2. Lower connecting slide column frame; 201. Middle threaded rod; 202. Lower rotating frame; 203. Lower gear;

[0031] 3. Different-tooth drive wheel; 301. Middle eccentric cam; 302. Driving motor;

[0032] 4. Middle scissor frame; 401. Side chute frame; 402. Middle chute frame. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] Embodiment 1: Please refer to Figures 1 to 8 :

[0035] The present invention provides a cell transfection device, which includes an upper swing seat 1, a lower connecting slide column frame 2, a differential tooth drive wheel 3 and a middle scissor frame 4. The middle scissor frame 4 is located below the upper swing seat 1. The top of the upper swing seat 1 is concave. Side connecting slide frames 102 are horizontally slidable on the front, rear, left and right sides of the upper swing seat 1. The side connecting slide frames 102 are symmetrically arranged left and right, and front and rear. A lower chute frame 101 is provided at the bottom of the upper swing seat 1. An external support spring 103 is fixed to the outside of the side connecting slide frame 102. The back cylinder of the side connecting slide frame 102 is horizontally slidably connected to the upper part of an external support slide frame 104. The lower part of the external support slide frame 104 is horizontally slidably connected to a lower fixed base 105. A lower connecting rack 106 is fixed to the end of the external support slide frame 104. The lower connecting rack 106 meshes with a middle transmission gear 107. When the upper swing seat 1 moves back and forth, the middle eccentric cam 301 at the lower part of the lower connecting slide column frame 2 pushes the right external support slide frame 104 to move. The external support slide frames 104 on the left and right sides move closer to the external support spring 103. The external support spring 103 increases the support force on the side connecting slide frames 102 of the upper swing seat 1 in the left and right directions, and the inertial movement of the upper swing seat 1 in the left and right directions before moving back and forth is stopped;

[0036] A lower connecting slide column frame 2 is provided below the upper swing seat 1. A middle threaded rod 201 is rotatably arranged at the lower part of the lower connecting slide column frame 2. An inverted L-shaped lower rotating frame 202 is slidable in the square tube at the lower part of the lower connecting slide column frame 2 with an L-shaped structure. A lower gear 203 is fixed to the lower part of the lower rotating frame 202. A differential tooth drive wheel 3 is arranged inside the lower connecting slide column frame 2. Middle eccentric cams 301 are eccentrically arranged at the upper and lower parts of the differential tooth drive wheel 3. The center of the differential tooth drive wheel 3 is fixedly connected to the main shaft of a drive motor 302. A middle scissor frame 4 is arranged above the differential tooth drive wheel 3. Side chute frames 401 are slidably connected to both sides of the middle scissor frame 4. A middle chute frame 402 is slidably connected to one side of the middle part of the middle scissor frame 4. The external support slide frames 104 at the front and rear of the middle part move synchronously in opposite directions through the middle scissor frame 4. The height of the side chute frame 401 is higher than that of the lower rotating frame 202. The center of the middle transmission gear 107 is rotatably connected to the lower fixed base 105. Lower connecting racks 106 are meshed with both sides of the middle transmission gear 107. The middle transmission gear 107 drives the lower connecting racks 106 on both sides to move in opposite directions through meshing. The end of the right external support slide frame 104 is slidably fitted with the middle eccentric cam 301 at the lower part of the differential tooth drive wheel 3. The middle chute frame 402 is slidably fitted with the middle eccentric cam 301 at the upper part of the differential tooth drive wheel 3. The middle eccentric cam 301 pushes the middle chute frame 402 to move outward. The middle chute frame 402 drives the middle scissor frame 4 to expand towards the left and right sides. The two side chute frames 401 move closer. The external support slide frames 104 connected to the side chute frames 401 move closer to the external support spring 103. The external support slide frame 104 presses the external support spring 103. The external support spring 103 increases the support force on the side connecting slide frames 102 in the middle of the upper swing seat 1, and stops the inertial movement of the upper swing seat 1 in the front and rear directions.

[0037] In the embodiment of the present disclosure, the lower rotating frame 202 is screwed to the middle threaded rod 201. The lower rotating frame 202 is rotatably connected to the lower fixed base 105. The lower chute frame 101 is slidably connected to the upper part of the lower connecting slide column frame 2. The chute length of the lower chute frame 101 is twice the moving range of the lower connecting slide column frame 2. The lower chute frame 101 leaves enough redundancy for the front-back movement when stopping left and right. When the lower connecting slide column frame 2 rotates circumferentially around the connection between the lower rotating frame 202 and the lower fixed base 105, the lower chute frame 101 moves horizontally back and forth, and the upper swing seat 1 moves back and forth or horizontally, realizing the cross-method shaking and mixing operation of the upper swing seat 1 and the cell transfection-related culture medium synchronously in the horizontal front-back and left-right directions.

[0038] In the embodiment of the present disclosure, the driving motor 302 is fixedly connected to the lower fixed base 105. A sector gear smaller than a semi-circle is arranged outside the different-tooth driving wheel 3. Both sides of the different-tooth driving wheel 3 are provided with a lower gear 203 and a lower connecting slide column frame 2. The sector gear outside the different-tooth driving wheel 3 is alternately meshed with the lower gears 203 on both sides. The sector gear of the different-tooth driving wheel 3 can only mesh with one lower gear 203 at a time. The different-tooth driving wheel 3 rotates in turn to drive the lower gears 203 on both sides to rotate. The sector gear of the different-tooth driving wheel 3 generates a non-meshing interval for both lower gears 203 to perform the static standing operation of the upper swing seat 1.

[0039] In the embodiment of the present disclosure, the side chute frame 401 is fixedly connected to the outer support slide frame 104 at the front and back of the middle part of the upper swing seat 1. The middle eccentric cam 301 and the sector gear outside the different-tooth driving wheel 3 are arranged in the same direction. When the different-tooth driving wheel 3 meshes with the lower gear 203 on the right side, the outer support slide frames 104 on the left and right move back and forth. The outer support slide frame 104 at the middle front and back moves closer to the lower connecting slide column frame 2. The outer support slide frame 104 squeezes the outer support spring 103, and the outer support spring 103 increases the supporting force on the side connecting slide frame 102 in the middle of the upper swing seat 1, stopping the inertia of the just front-back movement, and also preventing the lower connecting slide column frame 2 from rotating due to inertia. The front-back movement inertia before the left-right movement of the upper swing seat 1 is stopped, and there will be no front-back movement during the left-right movement.

[0040] Embodiment 2, on the basis of Embodiment 1, the bottom of the upper swing seat 1 is slidably connected to the lower chute frame 101. A spiral spring is arranged between the upper swing seat 1 and the lower chute frame 101. The lower chute frame 101 squeezes the spiral spring to drive the upper swing seat 1 to move back and forth. The resilience of the spiral spring can also drive the upper swing seat 1 to swing more times, increasing the number of vibration swings and enhancing the mixing effect.

[0041] Embodiment 3. On the basis of Embodiment 1, the eccentric cam 301 can also be a sliding bar structure protruding in a ring shape on the upper and lower parts of the different-tooth drive wheel 3. The eccentric cam 301 of the sliding bar structure is slidably connected to the U-shaped sliding grooves provided on the middle sliding groove frame 402 and the outer support sliding frame 104. The U-shaped sliding grooves of the middle sliding groove frame 402 and the outer support sliding frame 104 ensure two-way locking with the eccentric cam 301, avoiding the situation where the eccentric cam 301 of the cam structure only pushes the middle sliding groove frame 402 and the outer support sliding frame 104 in one direction. The eccentric cam 301 of the sliding bar structure can perform two-way pushing operations on the middle sliding groove frame 402 and the outer support sliding frame 104, ensuring the stability of the positions of the middle sliding groove frame 402 and the outer support sliding frame 104.

[0042] Working principle of this embodiment: The relevant culture medium for cell transfection is placed on the top of the upper swing seat 1. When cell transfection mixing is required, the drive motor 302 is started to drive the different-tooth drive wheel 3 to rotate. The sector gear of the different-tooth drive wheel 3 can only engage one lower gear 203 at a time. The different-tooth drive wheel 3 engages in turn to drive the two side lower gears 203 to rotate. The lower gear 203 and the lower rotating frame 202 rotate synchronously in a circumferential direction. The lower rotating frame 202 and the lower connecting sliding column frame 2 rotate synchronously. The lower connecting sliding column frame 2 rotates circumferentially around the lower rotating frame 202 as the center. The lower rotating frame 202 drives the upper swing seat 1 to move back and forth or horizontally through sliding with the lower sliding groove frame 101. The upper swing seat 1 moves and compresses the outer support spring 103, realizing the cross-method shaking and mixing operation of the upper swing seat 1 and the relevant culture medium for cell transfection synchronously in the horizontal front, back, left, and right directions. The sector gear of the different-tooth drive wheel 3 produces a non-engaging interval for both side lower gears 203 for static operation, fully ensuring that the culture medium is evenly spread; when the different-tooth drive wheel 3 engages with the right lower gear 203, the outer support sliding frames 104 on both the left and right sides achieve synchronous opposite movement through the engagement of the lower connecting rack 106 and the middle transmission gear 107. The middle transmission gear 107 engages to drive the two side lower connecting racks 106 to move in opposite directions. The outer support sliding frames 104 at the front and back in the middle achieve synchronous opposite movement through the middle scissor frame 4;

[0043] When the upper swing seat 1 moves left and right, the middle eccentric cam 301 of the different-tooth drive wheel 3 contacts the middle chute frame 402 on the right side. The middle eccentric cam 301 pushes against the middle chute frame 402 to move it outward. The middle chute frame 402 drives the middle scissors frame 4 to expand towards the left and right sides. The two side chute frames 401 move closer. The outer support slide frame 104 connected to the side chute frame 401 moves closer to the outer support spring 103. The outer support slide frame 104 presses against the outer support spring 103, and the outer support spring 103 increases the supporting force on the middle side connection slide frame 102 of the upper swing seat 1, stopping the inertia of the front-back movement just before contact. The inertia of the front-back movement before the left-right movement of the upper swing seat 1 is stopped, preventing the upper swing seat 1 from moving back and forth while moving left and right, ensuring the accuracy of the cross-method shaking and leveling operation. When the upper swing seat 1 moves back and forth, the middle eccentric cam 301 at the lower part of the lower connection slide column frame 2 pushes the outer support slide frame 104 on the right side to move. The outer support slide frames 104 on the left and right sides move closer to the outer support spring 103. The outer support spring 103 increases the supporting force on the left and right side connection slide frames 102 of the upper swing seat 1. The inertia of the left-right movement before the front-back movement of the upper swing seat 1 is stopped, ensuring that the upper swing seat 1 can maintain a stationary state during the process where the different-tooth drive wheel 3 is not engaged with the lower gears 203 on the left and right sides. The short stationary state is beneficial to improving the mixing efficiency of the cell transfection-related culture medium;

[0044] When the size of the culture medium changes and it is necessary to adjust the moving amplitude of the upper swing seat 1, by rotating the middle threaded rod 201, the thread of the middle threaded rod 201 guides the lower frame 202 to move axially. The distance between the lower connection slide column frame 2 and the lower frame 202 is enlarged or shortened. The distance between the centers of the lower connection slide column frame 2 and the lower frame 202 is enlarged or reduced. The diameter of the circumferential rotation of the lower connection slide column frame 2 around the center of the lower frame 202 is enlarged or reduced, realizing the adjustment of the reciprocating movement distance of the lower connection slide column frame 2 driving the lower chute frame 101, and realizing the adjustment of the shaking amplitude of the upper swing seat 1. Personnel can adjust different shaking amplitudes according to the size of the culture medium to ensure that the cell solution is evenly distributed at the bottom of the culture medium.

[0045] In this article, the following points need to be noted:

[0046] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure. Other structures can refer to the general design.

[0047] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0048] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A cell transfection device, comprising an upper swing seat, a lower connecting slide frame, a different-toothed driving wheel and a middle scissor frame; characterized in that: A lower connecting sliding column frame is arranged below the upper swing seat, a different-tooth driving wheel is arranged inside the lower connecting sliding column frame, a middle scissor frame is arranged on the upper part of the different-tooth driving wheel, a middle threaded rod is rotated at the lower part of the lower connecting sliding column frame, a lower rotating frame is slidably arranged at the lower part of the lower connecting sliding column frame, a lower gear is fixed at the lower part of the lower rotating frame, and the lower rotating frame and the middle threaded rod are screwed; The four sides of the upper swing seat are all horizontally slidably provided with side connection slides, a lower slide slot frame is arranged at the bottom of the upper swing seat, an outer support spring is fixed to the outer side of the side connection slide, a back cylinder of the side connection slide is horizontally slidably connected to the upper part of the outer support slide, a lower part of the outer support slide is horizontally slidably connected to the lower fixed base, a lower connection rack is fixed to the tail end of the outer support slide, and the lower connection rack is meshed with the middle transmission gear; The lower rotating frame is rotatably connected to the lower fixed base, the lower sliding chute frame is slidably connected to the lower connecting sliding column frame, and when the lower connecting sliding column frame rotates circumferentially around the connection between the lower rotating frame and the lower fixed base, the lower sliding chute frame reciprocates horizontally; The upper and lower parts of the heterogeneous toothed driving wheel are eccentrically provided with a central eccentric cam, and the center of the heterogeneous toothed driving wheel is fixedly connected to the main shaft of the driving motor; The driving motor is fixedly connected to the lower fixed base, a fan-shaped gear smaller than a semicircle is arranged on the outer side of the heterogeneous-toothed driving wheel, lower gears and lower connecting sliding column frames are arranged on both sides of the heterogeneous-toothed driving wheel, and the fan-shaped gear on the outer side of the heterogeneous-toothed driving wheel and the lower gears on both sides are alternately meshed and connected; The two sides of the middle scissor frame are slidably connected to the side sliding groove frame, and one side of the middle part of the middle scissor frame is slidably connected to the middle sliding groove frame; The center of the middle transmission gear is rotatably connected to the lower fixed base, lower connecting racks are meshed on both sides of the middle transmission gear, the tail end of the outer support slide and the middle eccentric cam at the bottom of the hetero-toothed driving wheel are slidably fitted, and the middle slide frame and the middle eccentric cam at the top of the hetero-toothed driving wheel are slidably fitted; The side slide frame is fixedly connected to the outer support slides at the front and rear of the middle part of the upper swing seat, and the middle eccentric cam and the outer fan gear of the heterogeneous drive wheel are arranged in the same direction; when the heterogeneous drive wheel and the lower gear on the right side are engaged, the outer support slides on the left and right sides move back and forth, and the outer support slides at the front and rear of the middle part move close to the lower connecting slide frame.

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