A desertified grassland vegetation restoration device

Abstract

The present invention belongs to the technical field of desertification control, and provides a desertification grassland vegetation restoration device, including two groups of walking mechanisms; two groups of working boxes, the two groups of working boxes are slidably connected between the two groups of walking mechanisms, and a discharge cavity is arranged in the working box; a conversion working component includes a rocker arm, the rocker arm is arranged at the bottom of the working box through a direction adjustment member, the direction adjustment member is used to adjust the rocker arm to be at the front or rear of the working box, and a conversion head is arranged at one end of the rocker arm away from the working box, and the conversion head includes two working modes of rolling and furrowing; a discharge conversion component includes a material guide channel arranged at the bottom of the discharge cavity, a tubular discharge part is arranged between the material guide channel and the working box, the material guide channel is arranged correspondingly to the rolling mode of the conversion head, and the tubular discharge part is arranged correspondingly to the furrowing mode of the conversion head. The present invention can realize the simultaneous laying of grass grids and furrowing sowing.

Description

Technical Field

[0001] The invention belongs to the technical field of desertification control, and in particular relates to a device for restoring vegetation in desertified grasslands. Background Art

[0002] Desertification grassland vegetation restoration equipment plays a vital role in the field of ecological restoration. Faced with my country's vast desertified land and increasingly serious grassland degradation problems, these equipment have significantly improved the efficiency and quality of vegetation restoration through efficient mechanized operations. They can not only quickly cover exposed sand and effectively prevent wind and sand erosion, but also promote the regeneration and growth of grassland vegetation through precise sowing and soil improvement technology.

[0003] Existing methods of restoring vegetation in desertified grasslands include: weaving prepared plant straw into a mesh structure according to certain specifications (such as 1 meter × 1 meter), and laying the prepared mesh structure of plant straw on the land that needs to be restored to form grass grids to prevent further land loss; digging trenches in the formed grass grids and sowing plant seeds, and reducing the progress of desertification through the soil-fixing effect of plant roots, thereby achieving restoration and control effects.

[0004] However, the existing available equipment has a single function and can only carry out trenching and sowing work after laying grass grids. It requires a lot of equipment and the work efficiency is also slow. Summary of the invention

[0005] The purpose of the present invention is to provide a desertified grassland vegetation restoration device to solve the above-mentioned problem and achieve the purpose of simultaneously carrying out grass grid laying and furrowing sowing.

[0006] To achieve the above object, the present invention provides the following solution: a desertified grassland vegetation restoration device, comprising:

[0007] Two sets of walking mechanisms, the two sets of walking mechanisms are arranged in parallel;

[0008] Two groups of working boxes, the two groups of working boxes are slidably connected between the two groups of walking mechanisms, the sliding direction of the two groups of working boxes is perpendicular to the walking direction of the walking mechanism, and a discharge cavity is arranged in the working box;

[0009] A conversion working assembly includes a rocker arm, which is arranged at the bottom of the working box through a direction adjusting member, and the direction adjusting member is used to adjust the rocker arm to be at the front or rear of the working box. A conversion head is arranged at one end of the rocker arm away from the working box, and the conversion head includes two working modes: rolling and ditching.

[0010] The material discharging conversion component includes a material guiding channel arranged at the bottom of the material discharging cavity, a tubular material discharging portion is arranged between the material guiding channel and the working box body, the material guiding channel is arranged correspondingly to the crushing mode of the conversion head, and the tubular material discharging portion is arranged correspondingly to the ditching mode of the conversion head.

[0011] Preferably, the direction adjustment member includes a rotating ring rotatably connected to the bottom of the working box body, the top of the rotating ring is coaxially fixedly connected to a ring gear, a third motor is fixedly connected to the working box body, a second gear is coaxially sleeved on the output shaft of the third motor, and the second gear is meshed with the ring gear.

[0012] Preferably, the bottom of the rotating ring is fixedly connected to a support, one end of the rocker arm is hinged on the support, the conversion head is arranged at the other end of the rocker arm, and a torsion spring is arranged between the support and the rocker arm, and the torsion spring is used to lift the rocker arm off the ground.

[0013] Preferably, two groups of first electric telescopic rods are fixedly connected to the bottom of the working box body, and the two groups of first electric telescopic rods are respectively arranged at the two ends of the bottom of the working box body along the walking direction of the walking mechanism, and the first electric telescopic rods are used to press one end of the rocker arm provided with the conversion head into the ground.

[0014] Preferably, the conversion head includes a conversion block, which is rotatably connected to one end of the rocker arm away from the support, one end of the conversion block is fixedly connected to a grooving knife, the other end of the conversion block is rotatably connected to a pressure wheel, and a locking piece is provided between the conversion block and the rocker arm.

[0015] Preferably, the locking member includes a latch, two groups of first through holes provided on the conversion block, and a second through hole provided on the rocker arm, the two groups of the first through holes are symmetrically arranged on both sides of the rotating shaft of the conversion block, the second through hole is arranged corresponding to one of the first through holes, and the latch is detachably inserted between the second through hole and one of the first through holes.

[0016] Preferably, the tubular discharge part includes two groups of discharge half-tubes horizontally slidably connected in the working box body, the two groups of the discharge half-tubes are arranged correspondingly, and through grooves are respectively opened on the two opposite side walls of the guide channel, the two groups of the through grooves are used to enable the two groups of the discharge half-tubes to translate into the guide channel, the two groups of the discharge half-tubes are respectively fixedly connected with second electric telescopic rods on the sides away from each other, the two groups of the second electric telescopic rods are respectively fixedly connected to the working box body, the tops of the two groups of the discharge half-tubes are respectively fixedly connected with sealing plates, and the two groups of the sealing plates are used to seal the top opening of the guide channel.

[0017] Preferably, the two groups of walking mechanisms are fixedly connected via two groups of connecting beams, and sliding grooves are respectively provided on both sides of the working box body, and the working box body is slidably connected between the two groups of connecting beams via the two groups of sliding grooves.

[0018] Preferably, a second motor is fixedly connected in the working box, a first gear is fixedly sleeved on the output shaft of the second motor, a rack is horizontally fixedly connected on one of the connecting beams, and the first gear is meshed with the rack.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects: the main function of the working box is to carry the conversion working component and the discharge conversion component, and drive the two to adjust their positions between the two walking mechanisms; the main function of the discharge cavity is to store plant straw or seeds to be sown; the main function of the rocker arm is to adjust the height of the conversion head so that it is in contact with or out of contact with the ground; the main function of the conversion head is to press the plant straw into the soil when laying grass grids, and to pre-ditch the soil when sowing seeds; the main function of the material guide channel is to pour the plant structure pre-woven into a grid onto the ground when laying grass grids; the main function of the pipe transfer discharge part is to block the material guide channel and sow the seeds on the ground when sowing seeds. On the whole, the present invention provides a new working mode by setting up two groups of working boxes so that the two groups of working boxes can independently perform two working modes of laying grass grids or sowing. That is, laying grass grids while sowing is carried out, which effectively improves the repair efficiency. At the same time, according to the needs of the site, the two groups of working boxes can simultaneously carry out the laying operation of grass grids to speed up the laying progress. Through the diversified selection of working modes, the repair device of the present invention has a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a schematic diagram of the repair device of the present invention;

[0022] Figure 2 is another schematic diagram of the repair device of the present invention;

[0023] Figure 3 A schematic diagram of a conversion head of the present invention;

[0024] Figure 4 It is a schematic diagram of the working box of the present invention;

[0025] Figure 5 is a cross-sectional view of the working box of the present invention;

[0026] Figure 6 for Figure 5 A partial enlarged view in FIG.

[0027] Figure 7 It is a schematic diagram of the discharging half pipe of the present invention;

[0028] Among them, 1. walking mechanism; 2. connecting beam; 3. working box; 4. rack; 5. discharge chamber; 6. rocker arm; 7. pressure wheel; 8. slide groove; 9. first electric telescopic rod; 10. rotating ring; 11. support; 12. material guide channel; 13. discharge half pipe; 14. through groove; 15. conversion block; 16. grooving knife; 17. first through hole; 18. second through hole; 19. latch; 20. slot; 21. first motor; 22. eccentric wheel; 23. second electric telescopic rod; 24. sealing plate; 25. second motor; 26. first gear; 27. third motor; 28. second gear; 29. ​​gear ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 7 The present invention provides a desertified grassland vegetation restoration device, comprising:

[0032] Two sets of walking mechanisms 1, the two sets of walking mechanisms 1 are arranged in parallel;

[0033] Two groups of working boxes 3, the two groups of working boxes 3 are slidably connected between the two groups of walking mechanisms 1, the sliding direction of the two groups of working boxes 3 is perpendicular to the walking direction of the walking mechanism 1, and a discharge cavity 5 is provided in the working box 3;

[0034] The conversion working assembly includes a rocker arm 6, which is arranged at the bottom of the working box 3 through a direction adjusting member, and the direction adjusting member is used to adjust the rocker arm 6 to be located at the front or rear of the working box 3. A conversion head is arranged at one end of the rocker arm 6 away from the working box 3, and the conversion head includes two working modes: rolling and ditching.

[0035] The material discharging conversion assembly includes a material guiding channel 12 arranged at the bottom of the discharging cavity 5, a tubular material discharging portion is arranged between the material guiding channel 12 and the working box 3, the material guiding channel 12 is arranged corresponding to the crushing mode of the conversion head, and the tubular material discharging portion is arranged corresponding to the ditching mode of the conversion head.

[0036] The main function of the walking mechanism 1 is to drive the repair equipment to walk; the main function of the working box 3 is to carry the conversion working component and the discharge conversion component, and drive the two to adjust their positions between the two walking mechanisms 1; the main function of the discharge chamber 5 is to store plant straw or seeds that need to be sown; the main function of the rocker arm 6 is to adjust the height of the conversion head so that it is in contact with or out of contact with the ground; the main function of the conversion head is to press the plant straw into the soil when laying grass grids, and to pre-ditch the soil when sowing seeds; the main function of the material guide channel 12 is to pour the plant structure pre-woven into a grid onto the ground when laying grass grids; the main function of the pipe transfer discharge part is to block the material guide channel 12 when sowing seeds and to sow the seeds on the ground. On the whole, the present invention provides a new working mode by setting up two groups of working boxes so that the two groups of working boxes can independently perform two working modes of laying grass grids or sowing. That is, laying grass grids while sowing is carried out, which effectively improves the repair efficiency. At the same time, according to the needs of the site, the two groups of working boxes can simultaneously carry out the laying operation of grass grids to speed up the laying progress. Through the diversified selection of working modes, the repair device of the present invention has a wider applicability.

[0037] To further optimize the solution, a control unit is further provided, and the control unit is electrically connected to the walking mechanism 1, the direction adjustment member and the tubular discharge part.

[0038] In a further optimized solution, a power system is also provided to provide working power for the repair device of the present invention. The power system can be a battery or directly connected to the power grid, and its working process will not be described in detail.

[0039] A further optimized solution is that the direction adjustment part includes a rotating ring 10 rotatably connected to the bottom of the working box body 3, the top of the rotating ring 10 is coaxially fixedly connected with a ring gear 29, a third motor 27 is fixedly connected inside the working box body 3, and a second gear 28 is coaxially sleeved on the output shaft of the third motor 27, and the second gear 28 is meshed with the ring gear 29.

[0040] like Figure 4 and Figure 6As shown, the third motor 27 is controlled to rotate by the control system. When the grass grid is to be laid, the third motor 27 can drive the rotating ring 10 to rotate, and drive the rocker arm 6 to rotate together, so that the rocker arm 6 moves to the rear of the moving direction of the working box 3. At the same time, when the trenching operation is to be performed, the controller controls the third motor 27 to drive the rotating ring 10 to rotate, and drives the rocker arm 6 to the front of the moving direction of the working box 3.

[0041] A further optimized solution is that the bottom of the rotating ring 10 is fixedly connected to a support 11, one end of the rocker arm 6 is hinged on the support 11, the conversion head is arranged at the other end of the rocker arm 6, and a torsion spring is arranged between the support 11 and the rocker arm 6, and the torsion spring is used to lift the rocker arm 6 off the ground.

[0042] A further optimized solution is that two sets of first electric telescopic rods 9 are fixedly connected to the bottom of the working box 3, and the two sets of first electric telescopic rods 9 are respectively arranged at the two ends of the bottom of the working box 3 along the walking direction of the walking mechanism 1, and the first electric telescopic rods 9 are used to press the end of the rocker arm 6 provided with the conversion head into the ground.

[0043] like Figure 3 and Figure 4 As shown, the rocker arm 6 can be kept lifted by a torsion spring (not shown) before receiving downward pressure, so that the conversion head is off the ground. When work is required, the control unit controls the first electric telescopic rod 9 to extend, and the telescopic end of the first electric telescopic rod 9 moves downward and presses down the rocker arm 6, so that the conversion head at the free end of the rocker arm 6 contacts the ground.

[0044] A further optimized solution is that the conversion head includes a conversion block 15, which is rotatably connected to one end of the rocker arm 6 away from the support 11, one end of the conversion block 15 is fixedly connected to a grooving knife 16, the other end of the conversion block 15 is rotatably connected to a pressure wheel 7, and a locking piece is provided between the conversion block 15 and the rocker arm 6.

[0045] Further optimization scheme, such as Figure 3 As shown, a slot 20 is formed at the free end of the rocker arm 6 , and the conversion block 15 is rotatably connected in the slot 20 .

[0046] A further optimized solution is that the locking member includes a latch 19, two groups of first through holes 17 opened on the conversion block 15, and a second through hole 18 opened on the rocker arm 6, the two groups of first through holes 17 are symmetrically arranged on both sides of the rotating shaft of the conversion block 15, the second through hole 18 is arranged corresponding to a first through hole 17, and the latch 19 is detachable and passes through the second through hole 18 and the first through hole 17.

[0047] like Figure 3As shown, when it is necessary to lay grass grids, the conversion block 15 is rotated to rotate the pressing wheel 7 out, and the first through hole 17 on the side away from the pressing wheel 7 is aligned with the second through hole 18. Thereafter, the latch 19 is inserted to limit the rotation of the conversion block 15, thereby ensuring that when the rocker arm 6 is pressed down, the pressing wheel 7 can be pressed down into the ground, thereby pressing the plant straw into the ground to form a grass grid.

[0048] Similarly, when trenching is required, the conversion block 15 is rotated to rotate the trenching knife 16 out, and at this time, the pressure wheel 7 is stored in the slot 20. After that, the latch 19 is inserted into the second through hole 18 and the other first through hole 17, so as to ensure that when the rocker arm 6 is pressed down, the trenching knife 16 can be pressed down into the ground, so as to perform trenching operation on the ground.

[0049] A further optimized solution is provided, in which the tubular discharge portion includes two groups of discharge half-tubes 13 horizontally slidably connected in the working box body 3, the two groups of discharge half-tubes 13 are correspondingly arranged, and through grooves 14 are respectively opened on the two opposite side walls of the material guide channel 12, and the two groups of through grooves 14 are used to enable the two groups of discharge half-tubes 13 to translate into the material guide channel 12, and the mutually distant sides of the two groups of discharge half-tubes 13 are respectively fixedly connected with second electric telescopic rods 23, and the two groups of second electric telescopic rods 23 are respectively fixedly connected in the working box body 3, and the tops of the two groups of discharge half-tubes 13 are respectively fixedly connected with sealing plates 24, and the two groups of sealing plates 24 are used to block the top opening of the material guide channel 12.

[0050] like Figure 4 , Figure 5 and Figure 7 As shown, when laying grass grids, the two groups of discharge half pipes 13 are driven by the second electric telescopic rods 23 to move away from the material guide channel 12, avoiding the internal space of the material guide channel 12. When sowing is required, the two groups of second electric telescopic rods 23 are controlled by the controller to extend, and the two groups of discharge half pipes 13 are connected in the material guide channel 12 through the through grooves 14 to form a whole pipe structure. At the same time, the sealing plate 24 on the top of the discharge half pipe 13 blocks the top opening of the material guide channel 12, so that the seeds in the discharge cavity 5 can only fall into the ground through the pipeline formed by the two groups of discharge half pipes 13.

[0051] According to a further optimized solution, the two groups of walking mechanisms 1 are fixedly connected by two groups of connecting beams 2, and slide grooves 8 are respectively provided on both sides of the working box 3. The working box 3 is slidably connected between the two groups of connecting beams 2 through the two groups of slide grooves 8.

[0052] like Figure 1 and Figure 2 As shown, the two groups of working boxes 3 can be moved between the two connecting beams 2 to change the distance between them, thereby adapting to different working requirements.

[0053] According to a further optimized solution, a second motor 25 is fixedly connected in the working box 3 , a first gear 26 is fixedly sleeved on the output shaft of the second motor 25 , a rack 4 is horizontally fixedly connected to a connecting beam 2 , and the first gear 26 is meshed with the rack 4 .

[0054] When the position of the working box 3 needs to be moved, the control unit can control the second motor 25 to rotate, so that the second motor 25 drives the first gear 26 to rotate, and the working box 3 is pushed to move to the appropriate position through the meshing action between the first gear 26 and the rack 4.

[0055] According to a further optimized solution, a first motor 21 is fixedly connected to the working box 3 , and an eccentric wheel 22 is fixedly sleeved on the output shaft of the first motor 21 .

[0056] like Figure 5 As shown, during sowing operation, the control unit controls the first motor 21 to rotate, which can drive the eccentric wheel 22 to rotate, thereby causing the discharge chamber 5 to vibrate, so that the seeds are discharged to the ground more smoothly.

[0057] The working process of this embodiment is as follows: when it is necessary to lay grass grids and sow seeds at the same time, the operator can first control the two sets of second motors 25 to rotate through the control unit, and adjust the distance between the two working boxes 3 according to the size of the grass grids. Afterwards, according to work needs, control the two sets of third motors 27 to move the rocker arm 6 for laying grass grids to the rear of the working box 3, and correspondingly rotate the pressure wheel 7 out of the rocker arm 6, and at the same time, move the rocker arm 6 for trenching to the front of the working box 3, and correspondingly rotate the trenching knife 16 out of the rocker arm 6. At the same time, for the working box 3 for sowing operations, the control unit controls the second electric telescopic rod 23 to extend and connect the two discharging half pipes 13. Afterwards, plant straw and seeds are respectively placed in the two discharge chambers 5. The walking mechanism 1 is started. During the travel, the plant structure is laid on the ground through the material guide channel 12, and then the middle part of the plant structure is pressed into the ground by the pressing wheel 7. At the same time, the trenching knife 16 digs a trench on the ground. Then, the seeds fall into the trench on the ground through the two discharge half pipes 13, completing the seed sowing.

[0058] Similarly, the operator can adjust the two working boxes 3 to a working mode for simultaneously laying grass grids or a working mode for simultaneously digging furrows and sowing according to usage requirements.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A desertified grassland vegetation restoration device, characterized in that: include: Two sets of walking mechanisms (1), the two sets of walking mechanisms (1) are arranged in parallel; Two groups of working boxes (3), the two groups of working boxes (3) are slidably connected between the two groups of walking mechanisms (1), the sliding direction of the two groups of working boxes (3) is perpendicular to the walking direction of the walking mechanism (1), and a material discharge cavity (5) is provided in the working boxes (3); A conversion working assembly comprises a rocker arm (6), wherein the rocker arm (6) is arranged at the bottom of the working box (3) through a direction adjusting member, wherein the direction adjusting member is used to adjust the rocker arm (6) to be located at the front or rear of the working box (3), and a conversion head is arranged at one end of the rocker arm (6) away from the working box (3), wherein the conversion head comprises two working modes: rolling and ditching; A material discharging conversion assembly comprises a material guiding channel (12) arranged at the bottom of the material discharging cavity (5), a tubular material discharging portion is arranged between the material guiding channel (12) and the working box (3), the material guiding channel (12) is arranged corresponding to the rolling mode of the conversion head, and the tubular material discharging portion is arranged corresponding to the trenching mode of the conversion head; The direction adjustment member comprises a rotating ring (10) rotatably connected to the bottom of the working box (3); a gear ring (29) is coaxially fixedly connected to the top of the rotating ring (10); a third motor (27) is fixedly connected inside the working box (3); a second gear (28) is coaxially sleeved on the output shaft of the third motor (27); and the second gear (28) is meshed with the gear ring (29); The bottom of the rotating ring (10) is fixedly connected to a support (11), one end of the rocker arm (6) is hinged on the support (11), the conversion head is arranged at the other end of the rocker arm (6), and a torsion spring is arranged between the support (11) and the rocker arm (6), and the torsion spring is used to lift the rocker arm (6) off the ground; The conversion head comprises a conversion block (15), the conversion block (15) is rotatably connected to one end of the rocker arm (6) away from the support (11), one end of the conversion block (15) is fixedly connected to a trenching knife (16), the other end of the conversion block (15) is rotatably connected to a pressure wheel (7), and a locking member is provided between the conversion block (15) and the rocker arm (6).

2. The desertified grassland vegetation restoration equipment according to claim 1 is characterized by: Two groups of first electric telescopic rods (9) are fixedly connected to the bottom of the working box (3), and the two groups of the first electric telescopic rods (9) are respectively arranged at two ends of the bottom of the working box (3) along the walking direction of the walking mechanism (1), and the first electric telescopic rods (9) are used to press one end of the rocker arm (6) provided with the conversion head into the ground.

3. The desertified grassland vegetation restoration equipment according to claim 1 is characterized by: The locking member comprises a latch (19), two groups of first through holes (17) provided on the conversion block (15), and a second through hole (18) provided on the rocker arm (6); the two groups of the first through holes (17) are symmetrically arranged on both sides of the rotating shaft of the conversion block (15); the second through hole (18) is arranged corresponding to one of the first through holes (17); and the latch (19) is detachably inserted between the second through hole (18) and one of the first through holes (17).

4. The desertified grassland vegetation restoration equipment according to claim 1 is characterized by: The tubular discharge portion comprises two groups of discharge half-tubes (13) horizontally slidably connected to the working box (3), the two groups of the discharge half-tubes (13) are arranged correspondingly, and two opposite side walls of the guide channel (12) are respectively provided with through grooves (14), and the two groups of the through grooves (14) are used to enable the two groups of the discharge half-tubes (13) to translate into the guide channel (12), and the two groups of the discharge half-tubes (13) are respectively fixedly connected to the mutually distant sides with second electric telescopic rods (23), and the two groups of the second electric telescopic rods (23) are respectively fixedly connected to the working box (3), and the tops of the two groups of the discharge half-tubes (13) are respectively fixedly connected with sealing plates (24), and the two groups of the sealing plates (24) are used to seal the top opening of the guide channel (12).

5. The desertified grassland vegetation restoration equipment according to claim 1 is characterized by: The two groups of walking mechanisms (1) are fixedly connected via two groups of connecting beams (2); sliding grooves (8) are respectively provided on both sides of the working box (3); and the working box (3) is slidably connected between the two groups of connecting beams (2) via the two groups of sliding grooves (8).

6. The desertified grassland vegetation restoration equipment according to claim 5 is characterized by: A second motor (25) is fixedly connected inside the working box (3), a first gear (26) is fixedly sleeved on the output shaft of the second motor (25), a rack (4) is horizontally fixedly connected to the connecting beam (2), and the first gear (26) is meshed with the rack (4).

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