Square tooth planet wheel type seedling feeding mechanism of rice transplanter
By designing a spur gear planetary wheel seedling delivery mechanism, the seedling delivery area can be adjusted using a support frame and drive module, solving the problem of space occupation by the transplanting module, achieving a more compact seedling arrangement, and improving the utilization rate of the planting field.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-03-10
AI Technical Summary
The transplanting modules in existing rice transplanters occupy space during the arrangement process, making it impossible to arrange the seedlings more compactly, which seriously wastes the utilization rate of the planting field.
The spur gear planetary wheel seedling feeding mechanism adopts a design of support frame, reciprocating drive module and linkage module, so that when the transmission component rotates, it drives the unidirectional steering component to rotate in the opposite direction, and the sliding plate moves in two directions to adjust the seedling feeding area and avoid the transplanting module occupying space.
This resulted in a more compact arrangement of seedlings, improved the utilization rate of the planting field, and made transplanting more efficient.
Smart Images

Figure CN121621093A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of rice transplanting equipment, and particularly relates to a spur planetary wheel type seedling feeding mechanism of a rice transplanter. BACKGROUND
[0002] The rice transplanter is a planting machine for transplanting rice seedlings in a paddy field, and mainly functions to improve the work efficiency and transplanting quality of the seedlings and realize reasonable planting.
[0003] In order to improve the work efficiency of the transplanter, a plurality of seedling planting tables are arranged at intervals in the transplanter, the seedling planting tables can place seedlings, and each seedling planting table is arranged with a seedling planting module, so that a plurality of seedling planting modules can be operated simultaneously to enable a row of compact seedlings to be planted in the planting field.
[0004] However, the seedling planting module occupies a certain space during arrangement, which causes the arrangement of the seedlings to be less compact and seriously wastes the utilization rate of the planting field. SUMMARY
[0005] Therefore, the present application aims to provide a spur planetary wheel type seedling feeding mechanism of a rice transplanter to solve the problem that the seedling planting module in the transplanter occupies a certain space during arrangement, which causes the arrangement of the seedlings to be less compact and seriously wastes the utilization rate of the planting field.
[0006] The present application provides a spur planetary wheel type seedling feeding mechanism of a rice transplanter, which comprises a plurality of seedling tables arranged at intervals, a seedling feeding module corresponding to each seedling table, a support frame, a reciprocating driving module and a linkage module. The support frame is used to support the plurality of seedling tables and the plurality of seedling feeding modules. The reciprocating driving module is arranged in the body of the seedling feeding mechanism, and comprises a transmission member rotatably connected to the body, and two one-way steering members in transmission connection with the transmission member, wherein the two one-way steering members are rotatably arranged on opposite sides of the transmission member, and each one-way steering member is in transmission connection with the transmission member, so that when the transmission member rotates one circle, the two one-way steering members rotate in opposite directions. The linkage module comprises a sliding plate having two steering portions, and the sliding plate is connected with the support frame, wherein the two steering portions are in transmission connection with the two one-way steering members, so as to drive the sliding plate to move in two directions when the two one-way steering members move in one direction, and the seedling feeding area of each seedling feeding module is reciprocally switched.
[0007] Further, the seedling feeding mechanism further comprises an elastic sealing module arranged between the sliding plate and the machine body, which is used to seal / unseal the sliding gap between the sliding plate and the machine body.
[0008] Further, the elastic sealing module comprises a first electromagnet, a sealing strip, a metal pushing plate and an elastic member. The first electromagnet is arranged in the machine body, the sealing strip is stacked below the metal pushing plate, and the metal pushing plate is elastically connected with the sliding gap through the elastic member. The side of the sealing strip away from the metal pushing plate is opposite to the sliding plate, so that the metal pushing plate is driven to move up and down by the first electromagnet, so that the sealing strip reciprocates between being close to the sliding plate and not being close to the sliding plate.
[0009] Further, the seedling feeding mechanism further comprises a telescopic air bag, an air chamber arranged in the sliding plate, a telescopic pipe for connecting the air chamber and the telescopic air bag, and an air inlet one-way valve arranged on the telescopic air bag and an air outlet one-way valve arranged on the telescopic pipe. The upper surface of the sliding plate is provided with a plurality of water collecting grooves, which are communicated with the air chamber, when the sliding plate moves in one direction, the telescopic air bag is stretched, so that the ram air enters the telescopic air bag from the air inlet one-way valve. When the sliding plate moves in the other direction, the ram air in the telescopic air bag is output from the air outlet one-way valve to the air chamber to blow the water inlet between the water collecting groove and the air chamber.
[0010] Further, the sliding plate is further provided with a water outlet pipe with a valve, which is communicated with the air chamber, and the liquid in the air chamber is discharged from the water outlet pipe by starting the valve.
[0011] Further, one end of the telescopic air bag is fixedly connected with the machine body.
[0012] Further, a plurality of water inlets are arranged between the water collecting groove and the air chamber, and the plurality of water inlets are arranged along the length direction of the water collecting groove.
[0013] Further, the reciprocating driving module comprises a driver connected with the transmission member, which is used to drive the transmission member to rotate.
[0014] Further, the reciprocating drive module comprises a first one-way steering member and a second one-way steering member, the first one-way steering member and the second one-way steering member are respectively arranged on opposite sides of the transmission member, and the first one-way steering member and the second one-way steering member are both in transmission connection with the transmission member.
[0015] Further, the first one-way steering member is provided with a first transmission part, and the second one-way steering member is provided with a second transmission part, the first transmission part is in transmission connection with the first steering part of the sliding plate, and the second transmission part is in transmission connection with the second steering part of the sliding plate.
[0016] Compared with the prior art, the beneficial effects of the pinion planetary wheel type seedling feeding mechanism of the rice transplanter are as follows: The seedling table can provide a placing space for seedlings, and the seedling feeding module can plant seedlings. In the prior art, the seedling feeding module occupies a certain space during arrangement, which causes the arrangement of seedlings to be less compact and seriously wastes the utilization rate of the planting field. Therefore, in the present example, the reciprocating drive module, the support frame and the linkage module are arranged, so that the transmission member in the reciprocating drive module drives the two one-way steering members to rotate in opposite directions when rotating, and the two steering parts are in transmission connection with the two one-way steering members respectively, so as to drive the sliding plate to move in two directions when the two one-way steering members move in one direction respectively, so as to reciprocally switch the seedling feeding area of each seedling feeding module. That is, the movement of the sliding plate can drive the support frame to move, and the movement of the support frame can change the positions of the plurality of seedling tables and the plurality of seedling feeding modules, thereby adjusting the seedling feeding area. The arrangement of the seedling feeding module occupies a certain space, which causes the arrangement of seedlings to be less compact and seriously wastes the utilization rate of the planting field. The seedling feeding mechanism of the present application makes the seedling planting more compact. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 FIG. 1 is a perspective view of a pinion planetary wheel type seedling feeding mechanism of a rice transplanter according to an embodiment of the present application; Figure 2 FIG. 3 is a structural schematic view of a reciprocating drive module according to an embodiment of the present application; Figure 3 FIG. 4 is a half-section perspective view of a machine body according to an embodiment of the present application; Figure 1 FIG. 5 is an enlarged schematic view of A part of FIG. 4; Figure 4 Figure 3 FIG. 6 is a rear view of the machine body according to an embodiment of the present application; Figure 5 FIG. 7 is an enlarged schematic view of B part of FIG. 4; Figure 6 FIG. 8 is a schematic view of a seedling feeding module according to an embodiment of the present application; and Figure 5 FIG. 9 is a schematic view of a seedling feeding module according to another embodiment of the present application.Figure 7 Structure diagram of water inlet; Figure 8 Fig. 4 is a schematic diagram of a rice transplanter using the positive planetary wheel type seedling delivery mechanism in an embodiment of the present application.
[0018] Reference signs: 100, seedling table; 200, seedling delivery module; 300, support frame; 400, reciprocating drive module; 410, transmission member; 420, first one-way turning member; 421, first transmission part; 430, second one-way turning member; 431, second transmission part; 440, driver; 500, linkage module; 510, sliding plate; 511, first turning part; 512, second turning part; 600, elastic sealing module; 610, first electromagnet; 620, sealing strip; 630, metal pushing plate; 640, elastic member; 700, telescopic air bag; 710, air chamber; 720, telescopic tube; 730, air inlet one-way valve; 740, air outlet one-way valve; 750, water collecting tank; 760, water inlet; 800, machine body; 900, water outlet pipe.
[0019] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. Several embodiments of the present application are given in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application is more thorough and complete.
[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0023] EMBODIMENTS Please refer to Figures 1 to 7The image shows a spur gear planetary wheel type seed delivery mechanism for a rice transplanter in the first embodiment of the present invention, which includes multiple seedling platforms 100 spaced apart, a seed delivery module 200 corresponding to each seedling platform 100, a support frame 300, a reciprocating drive module 400, and a linkage module 500. The support frame 300 is used to support multiple seedling trays 100 and multiple seedling delivery modules 200; The reciprocating drive module 400 is located inside the body 800 of the seedling feeding mechanism. The reciprocating drive module 400 includes a transmission component 410 rotatably connected inside the body 800 and two one-way steering components that are pulverizedly connected to the transmission component 410. The two one-way steering components are respectively rotatably located on opposite sides of the transmission component 410, and each one-way steering component is pulverizedly connected to the transmission component 410 so that when the transmission component 410 rotates one revolution, the two one-way steering components rotate in opposite directions. The linkage module 500 includes a sliding plate 510 with two steering parts. The sliding plate 510 is connected to the support frame 300. The two steering parts are respectively connected to two unidirectional steering members for driving the sliding plate 510 to move in two directions when the two unidirectional steering members move in one direction, so as to switch the seedling delivery area of each seedling delivery module 200 back and forth.
[0024] In practical implementation, the seedling platform 100 provides space for placing seedlings, and the seedling delivery module 200 can transplant the seedlings. Given that existing transplanting modules occupy space during setup, preventing compact seedling arrangement and significantly wasting the utilization rate of the planting field, this example utilizes the support frame 300, reciprocating drive module 400, and linkage module 500. This allows the transmission component 410 in the reciprocating drive module 400 to drive two one-way steering components to rotate in opposite directions when rotating. Simultaneously, the two steering components are connected to the two one-way steering components for transmission, thus enabling... When the two unidirectional steering components move in one direction, they drive the sliding plate 510 to move in both directions, so that the seedling delivery area of each seedling delivery module 200 is switched back and forth. In other words, the movement of the sliding plate 510 can drive the support frame 300 to move. The movement of the support frame 300 can change the position of multiple seedling platforms 100 and multiple seedling delivery modules 200, thereby adjusting the seedling delivery area. This avoids the seedling modules occupying a certain amount of space during the arrangement process, which would prevent the seedlings from being arranged more compactly and seriously waste the utilization rate of the planting field. The seedling delivery mechanism shown in this invention makes the seedling transplanting more compact.
[0025] For a better understanding of this case, please refer to [link / reference]. Figure 8 As shown, the areas drawn with solid lines represent the initial rice planting positions, while the areas drawn with dashed lines represent the rice planting areas corresponding to the support frame 300 after it has been moved.
[0026] It should be further noted that in this embodiment, the reciprocating drive module 400 includes a driver 440, which is connected to the transmission component 410 and is used to drive the transmission component 410 to rotate. The driver 440 can be composed of an encoder and a motor in the prior art. The encoder can control the operating state of the motor.
[0027] Specifically, in this example, the reciprocating drive module 400 includes a first one-way steering component 420 and a second one-way steering component 430. The first one-way steering component 420 and the second one-way steering component 430 are respectively disposed on opposite sides of the transmission component 410, and both the first one-way steering component 420 and the second one-way steering component 430 are connected to the transmission component 410 in a driving connection. The first one-way steering component 420 is provided with a first transmission part 421, and the second one-way steering component 430 is provided with a second transmission part 431. The first transmission part 421 is connected to the first steering part 511 of the sliding plate 510 in a driving connection, and the second transmission part 431 is connected to the second steering part 512 of the sliding plate 510 in a driving connection.
[0028] Please refer to the details. Figure 2 As shown, the transmission component 410 can be a gear. The first one-way steering component 420 and the second one-way steering component 430 both have gears that mesh with the transmission component 410. The first transmission part 421 and the second transmission part 431 are both irregular fan-shaped teeth. The first steering part 511 and the second steering part 512 are the teeth on the front and back of the sliding plate 510, respectively.
[0029] In specific implementation, the drive 440 drives the transmission component 410 to rotate. The transmission component 410 will sequentially drive the first one-way steering component 420 and the second one-way steering component 430 to rotate in opposite directions, so that the first transmission part 421 and the second transmission part 431 respectively drive the sliding plate 510 to slide in the left and right directions, thereby driving the support frame 300, the seedling platform 100 and the seedling delivery module 200 to move synchronously.
[0030] It should also be noted that, since the seedlings placed on the seedling platform 100 will generate wastewater, which is formed by the water and soil naturally present at the roots of the seedlings, in this example, to prevent the reciprocating drive module 400 from getting stuck due to the wastewater, the seedling delivery mechanism also includes an elastic sealing module 600 located between the sliding plate 510 and the machine body 800. The elastic sealing module 600 is used to seal / unseal the sliding gap between the sliding plate 510 and the machine body 800. Specifically, the elastic sealing module 600 includes a first electromagnet 610 and a sealing strip 6 20. Metal push plate 630 and elastic element 640; First electromagnet 610 is disposed inside the body 800, and sealing strip 620 is stacked under metal push plate 630. Metal push plate 630 is elastically connected to sliding gap through elastic element 640; wherein, the side of sealing strip 620 away from metal push plate 630 is opposite to sliding plate 510, so that metal push plate 630 is driven to move up and down by first electromagnet 610, so that sealing strip 620 switches back and forth between being tightly attached to sliding plate 510 and not being tightly attached to sliding plate 510.
[0031] Please see Figure 4 As shown, when placing seedlings, the first electromagnet 610 is stationary. The elastic element 640 drives the metal push plate 630 to apply downward pressure, allowing the sealing strip 620 to adhere tightly to the upper surface of the sliding plate 510. This prevents gaps between the sliding plate 510 and the machine body 800, avoiding sewage entering the machine body 800 and affecting the transmission effect of the reciprocating drive module 400. When the seedlings are being transplanted, especially during the movement of the sliding plate 510, the first electromagnet 610 is energized, generating magnetism between the metal push plate 630 and the first electromagnet 610. This creates a gap between the sealing strip 620 and the machine body 800, ensuring the normal movement of the sliding plate 510 and preventing wear on the sealing strip 620 that could affect its sealing performance.
[0032] It should be noted that the seedlings have the most sewage at their roots during placement. Therefore, during operation, the process can be paused for a period of time to allow most of the sewage to fall to the outside. In other words, the seedling delivery mechanism should be completely stopped.
[0033] However, a small amount of sewage will still seep into the interior of the machine body 800 during the operation of the seedling delivery mechanism. Therefore, in this example, the seedling delivery mechanism also includes a telescopic airbag 700, an air chamber 710 located in the sliding plate 510, a telescopic pipe 720 for connecting the air chamber 710 and the telescopic airbag 700, an air inlet check valve 730 located on the telescopic airbag 700, and an air outlet check valve 740 located on the telescopic pipe 720. The upper surface of the sliding plate 510 is provided with multiple water collection grooves 750, which are connected to the air chamber 710. When the sliding plate 510 moves in one direction, the telescopic airbag 700 is stretched, so that the rammed gas enters the telescopic airbag 700 from the air intake one-way valve 730. When the sliding plate 510 moves in another direction, the pressurized gas in the telescopic airbag 700 is output from the one-way valve 740 to the air chamber 710 to blow air into the water inlet 760 located between the water collection tank 750 and the air chamber 710.
[0034] Specifically, the sliding plate 510 is also equipped with a water outlet pipe 900 with a valve. The water outlet pipe 900 is connected to the air chamber 710. By activating the valve, the liquid in the air chamber 710 is discharged from the water outlet pipe 900.
[0035] In some other preferred embodiments, one end of the telescopic airbag 700 is fixedly connected to the body 800, and a plurality of water inlets 760 are provided between the water collection tank 750 and the air chamber 710, with the plurality of water inlets 760 spaced apart along the length of the water collection tank 750.
[0036] Please see Figure 5 and Figure 6 As shown, in this embodiment, the exhaust check valve 740 is fixed inside the air chamber 710, and one end of the telescopic tube 720 near the exhaust check valve 740 is sealed to the air chamber 710. In this example, when sewage leaks through the gap between the sliding plate 510 and the body 800, the sewage will be collected through the water collection tank 750. Using the water inlet 760, the sewage in the water collection tank 750 enters the air chamber 710 through the water inlet 760, ensuring the dryness between the sliding plate 510 and the body 800.
[0037] On the other hand, since sewage contains sludge, the inlet 760 may become clogged. In this example, when the sliding plate 510 moves to the right, the telescopic airbag 700 is stretched, and external gas enters the airbag through the inlet one-way valve 730. When the sliding plate 510 moves to the left, the telescopic airbag 700 is compressed, and the pressurized gas inside the telescopic airbag 700, which is the external gas, is output to the air chamber 710 through the outlet one-way valve 740. The pressurized gas is discharged through the inlet 760. The pressurized gas is used to flush out the sludge embedded in the inlet 760, avoiding the blockage of the inlet 760 and effectively ensuring the normal operation of the seedling delivery mechanism.
[0038] In summary, the spur gear planetary wheel seedling feeding mechanism of the rice transplanter shown in this embodiment has the following beneficial effects: The seedling platform 100 provides space for placing seedlings, and the seedling delivery module 200 can transplant the seedlings. However, in existing technologies, the transplanting module occupies space during setup, preventing a more compact seedling arrangement and severely wasting the utilization rate of the planting field. Therefore, in this example, the support frame 300, reciprocating drive module 400, and linkage module 500 are used. When the transmission component 410 in the reciprocating drive module 400 rotates, it drives two one-way steering components to rotate in opposite directions. Simultaneously, the two steering components are connected to the two one-way steering components for transmission in opposite directions. When the steering components move in one direction, they drive the sliding plate 510 to move in two directions, causing the seedling delivery area of each seedling delivery module 200 to switch back and forth. In other words, the movement of the sliding plate 510 can drive the support frame 300 to move. The movement of the support frame 300 can change the position of multiple seedling platforms 100 and multiple seedling delivery modules 200, thereby adjusting the seedling delivery area. This avoids the seedling modules occupying a certain amount of space during the arrangement process, which would prevent the seedlings from being arranged more compactly and seriously waste the utilization rate of the planting field. The seedling delivery mechanism shown in this invention can make the seedling transplanting more compact.
[0039] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0040] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A positive-tooth planetary wheel type seedling feeding mechanism of a rice transplanter, comprising a plurality of seedling tables arranged at intervals and a seedling feeding module arranged in correspondence with each seedling table, characterized in that, Also include support frame, reciprocating drive module and linkage module; The support frame is used for supporting a plurality of the seedling tables and a plurality of the seedling feeding modules; The reciprocating drive module is arranged in the machine body of the seedling feeding mechanism, and the reciprocating drive module comprises a transmission member rotatably connected in the machine body, two one-way steering members in transmission connection with the transmission member, wherein the two one-way steering members are rotatably arranged on opposite sides of the transmission member, and each one-way steering member is in transmission connection with the transmission member, so that when the transmission member rotates one circle, the two one-way steering members rotate in opposite directions respectively. The linkage module comprises a sliding plate having two steering portions, and the sliding plate is connected with the support frame, wherein the two steering portions are in transmission connection with the two one-way steering members respectively, so as to drive the sliding plate to move in two directions when the two one-way steering members move in one direction respectively, so as to switch the seedling feeding area of each seedling feeding module reciprocally.
2. The positive-tooth planetary wheel type seed delivering mechanism of a rice transplanter according to claim 1, wherein The seedling feeding mechanism further comprises an elastic sealing module arranged between the sliding plate and the machine body, which is used for sealing / unsealing the sliding gap between the sliding plate and the machine body.
3. The positive-tooth planetary wheel type seed delivering mechanism of a rice transplanter according to claim 2, wherein The elastic sealing module comprises a first electromagnet, a sealing strip, a metal push plate and an elastic member; The first electromagnet is arranged in the machine body, the sealing strip is stacked below the metal push plate, and the metal push plate is elastically connected with the sliding gap through the elastic member; Wherein, the side of the sealing strip away from the metal push plate is opposite to the sliding plate, so that the metal push plate is driven to move up and down by the first electromagnet, so that the sealing strip is switched reciprocally between being close to the sliding plate and not close to the sliding plate.
4. The positive-tooth planetary wheel type seed delivering mechanism of the rice transplanter according to claim 3, wherein The seedling feeding mechanism further comprises a telescopic air bag, an air chamber arranged in the sliding plate, a telescopic pipe for communicating the air chamber and the telescopic air bag, and an air inlet one-way valve arranged on the telescopic air bag and an air outlet one-way valve arranged on the telescopic pipe; Wherein, the upper surface of the sliding plate is provided with a plurality of water collecting grooves, and the water collecting grooves are in communication with the air chamber, when the sliding plate moves in one direction, the telescopic air bag is stretched, so that the compressed gas enters the telescopic air bag from the air inlet one-way valve; When the sliding plate moves in the other direction, the compressed gas in the telescopic air bag is output from the air outlet one-way valve to the air chamber, so as to blow the water inlet between the water collecting groove and the air chamber.
5. The positive-tooth planetary wheel type seed delivering mechanism of the rice transplanter according to claim 4, wherein The sliding plate is further provided with a water outlet pipe having a valve, the water outlet pipe is in communication with the air chamber, and the liquid in the air chamber is discharged from the water outlet pipe by starting the valve.
6. The positive-tooth planetary wheel type seed delivering mechanism of the rice transplanter according to claim 4, wherein One end of the telescopic air bag is fixedly connected with the machine body.
7. The positive-tooth planetary wheel type seed delivering mechanism of the rice transplanter according to claim 4, wherein A plurality of water inlets are arranged between the water collecting groove and the air chamber, and the plurality of water inlets are arranged along the length direction of the water collecting groove.
8. The positive-tooth planetary wheel type seed delivering mechanism of a rice transplanter according to claim 1, wherein The reciprocating drive module comprises a driver connected with the transmission member, for driving the transmission member to rotate.
9. The positive-tooth planetary wheel type seed delivering mechanism of a rice transplanter according to claim 1, wherein The reciprocating drive module comprises a first one-way steering part and a second one-way steering part, the first one-way steering part and the second one-way steering part are respectively arranged on opposite sides of the transmission part, and the first one-way steering part and the second one-way steering part are both in transmission connection with the transmission part.
10. The positive-tooth planetary wheel type seed delivering mechanism of a rice transplanter according to claim 9, wherein The first one-way steering part is provided with a first transmission part, the second one-way steering part is provided with a second transmission part, the first transmission part is in transmission connection with a first steering part of the sliding plate, and the second transmission part is in transmission connection with a second steering part of the sliding plate.