Crop marker

Abstract

The invention discloses a crop row marker which comprises a mounting plate, a plurality of first movable sleeves are arranged on the outer side wall of the mounting plate, mounting cavities are formed in the bottom ends of the first movable sleeves, inserting blocks are inserted into the bottom ends of the mounting cavities, connecting blocks are mounted at the bottom ends of the inserting blocks, movable cavities are formed in the bottom ends of the connecting blocks, and the movable cavities are communicated with the first movable sleeves. In the using process, the semi-gear, the driving plate and the clamping teeth are matched to drive the advancing plate to circularly move, so that through the movement of the advancing plate, the guide block can be circularly pushed to move in the movable cavity, and the movement of the moving plate is facilitated; according to the soil paddling device, the paddling block is pushed to move towards the front end of the whole device, so that the paddling block circularly moves, the soil can be broken, meanwhile, more labor is saved when the device is used for paddling the soil, and the practicability and convenience of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of rowing device technology, specifically to a crop rowing device. Background Technology

[0002] Before conducting field trials, row marking is a necessary and routine procedure; it ensures both the accuracy and aesthetics of the trial. However, for different crops, different planting spacing and row spacing need to be selected based on the crop's specific characteristics.

[0003] Existing crop row markers are limited by soil characteristics, which lead to variations in plant spacing and row spacing, as well as different plant species used in field trials. As a result, traditional crop row markers can only mark rows according to specified specifications, leading to strong limitations and poor applicability.

[0004] A search revealed a portable crop field experiment rowing device (publication number: CN114793574A) in Chinese patent literature. This invention discloses a portable crop field experiment rowing device, comprising a horizontal rowing rod with multiple sliding and locking teeth. A pull handle is fixed to the rod at its center for propulsion. Positioning wheels at both ends of the rowing rod are designed to press against the rowing line. The positioning wheels have grooves on their annular surfaces to accommodate the rowing line, and the rowing teeth protrude downwards from the positioning wheels. The device moves along the guide line by pressing the positioning wheels against it, thus reducing guide line deviation caused by contact between the rowing teeth and the guide line, ensuring near-straight rowing and experimental accuracy. However, the following drawbacks still exist:

[0005] While the aforementioned rowing device achieves the goal of pressing the positioning wheel onto the guide rope and then pushing the rowing device along the direction of the guide rope, reducing the contact between the rowing teeth and the guide rope and causing the guide rope to deviate, thus ensuring that the rowing is nearly straight and the accuracy of the experiment, it still has limitations. Due to the characteristics of the soil, the planting spacing and row spacing are different, and the plants used in field trials are also different. Therefore, traditional crop rowing devices can only achieve rowing according to the specified specifications, resulting in strong limitations and poor applicability. Summary of the Invention

[0006] The purpose of this invention is to provide a crop row marker to solve the problems mentioned in the background art, which are that due to the characteristics of the soil, the planting spacing and row spacing are different, and the plants planted in field trials are also different. As a result, traditional crop row markers can only mark rows according to the specified specifications, which leads to strong limitations and poor applicability.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a crop rowing device, comprising a mounting plate, wherein a plurality of first movable sleeves are provided on the outer side wall of the mounting plate, and each of the first movable sleeves has a mounting cavity at its bottom end. A connecting block is inserted into the bottom end of the mounting cavity, and a connecting block is installed at the bottom end of the connecting block. A movable cavity is installed at the bottom end of the connecting block, and a guide block is movably connected through the movable cavity. A rowing block is installed at one end of the guide block. Side plates are symmetrically mounted on the rear end of the mounting plate, and a second movable sleeve is provided on the outer side wall of each side plate. A traveling plate is connected to the second movable sleeve. A driving plate is installed at one end of the traveling plate, and a locking tooth is installed at equal intervals on the top end of the driving plate. The top end of the driving plate meshes with the bottom end of a half gear through the locking tooth.

[0008] Preferably, the top of the mounting plate has equally spaced snap-fit ​​grooves, and the snap-fit ​​grooves are inlaid with magnetic blocks.

[0009] Preferably, the top of the first movable sleeve is hinged to a cover plate, and the bottom of the cover plate is equipped with a snap-fit ​​block. The snap-fit ​​block is made of magnetic material and is snapped into the inside of the snap-fit ​​groove and magnetically attracted to the top of the magnetic block.

[0010] Preferably, the top end of the plug-in block is inserted into the interior of the mounting cavity and is also inserted into the bottom end of the plug-in cavity. The plug-in cavity is installed at the top end of the interior of the mounting cavity. Reset springs are symmetrically installed on both sides of the mounting cavity, and one end of the reset spring is connected to the interior of one end of the limiting block. The other end of the limiting block passes through the interior of the limiting cavity, and the limiting cavity is opened on both sides of the mounting cavity.

[0011] Preferably, a connecting spring is installed on the side wall of the second movable sleeve away from the travel plate, and the other end of the connecting spring is connected to one end of the connecting block, which is installed on the outer side wall of the side plate.

[0012] Preferably, one side of the half gear is connected to the output end of the motor, and the motor is mounted on the side wall of the connecting block. The connecting block is mounted on the top of the rear plate, and the rear plate is mounted on the side plate away from the mounting plate.

[0013] Preferably, the outer side wall of the rear plate is fitted with a third movable sleeve, and the front end of the third movable sleeve is equipped with a travel wheel.

[0014] Preferably, a transmission screw sleeve is installed at the rear end of the third movable sleeve, and a connecting screw is engaged with the inner side wall of the transmission screw sleeve. The connecting screw is movably connected between two mounting blocks, and the mounting blocks are symmetrically installed at the rear end of the rear plate. An adjustment knob is connected between the connecting screws, and the teeth on the outer side walls of the connecting screws on both sides are arranged in opposite structures.

[0015] Preferably, each side panel has a rotating cavity installed on its side wall, and a rotating block is movably connected inside each rotating cavity. One end of the rotating block extends to the outside of the rotating cavity and is connected to one end of the handle. A silicone anti-slip sleeve is fitted on the upper outer side wall of the handle.

[0016] Preferably, the rotating block is provided with first limiting protrusions at equal intervals on the outer wall of the rotating cavity, and the outer wall of the first limiting protrusion abuts against the outer wall of the second limiting protrusion. The second limiting protrusions are provided with equal intervals on the inner wall of the flexible sheet, and the flexible sheet is installed inside the rotating cavity.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. During use, the marking blocks and other components used for marking soil can be quickly adjusted according to soil and plant factors. The adjusted limiting method is very convenient. At the same time, the vulnerable parts in this device are easy to disassemble and assemble, which facilitates later maintenance. This improves the practicality and convenience of the device, avoids the limitations of traditional devices, and makes the device more applicable.

[0019] 2. During use, the present invention uses a half gear, a drive plate, and a locking tooth to drive the traveling plate in a cyclical motion. The movement of the traveling plate can cyclically push the guide block inside the moving cavity and push the sliding block to the front end of the device. The cyclical movement of the sliding block can break up the soil and make the soil sliding operation more labor-saving, thus improving the practicality and convenience of the device.

[0020] 3. By incorporating the travel wheels, the device can move within the already marked furrows during the rowing process before planting crops. This makes the device more labor-saving during use and effectively prevents the travel wheels from creating new furrows due to the weight of the device, which would make it difficult to distinguish during planting. This improves the practicality and flexibility of the device, enabling it to cope with different environmental factors. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged structural diagram of part A in the diagram;

[0024] Figure 4This is a schematic diagram of the combined component structure of the first movable sleeve, cover plate, snap-fit ​​block and mounting cavity in this invention;

[0025] Figure 5 This is a schematic diagram of the combined component structure of the mounting cavity, insertion block, connecting block, movable cavity, guide block, sliding block, return spring and limiting block in this invention;

[0026] Figure 6 This is a schematic diagram of the combined components of the second movable sleeve, the traveling plate, the drive plate, the locking teeth, and the half gear in this invention.

[0027] Figure 7 This is a schematic diagram of the internal structure of the rotating cavity in this invention.

[0028] In the diagram: 1. Mounting plate; 2. Snap-fit ​​groove; 3. Magnetic block; 4. First movable sleeve; 5. Cover plate; 6. Snap-fit ​​block; 7. Mounting cavity; 8. Insertion cavity; 9. Insertion block; 10. Connecting block; 11. Movable cavity; 12. Guide block; 13. Sliding block; 14. Return spring; 15. Limiting block; 16. Side plate; 17. Second movable sleeve; 18. Traveling plate; 19. Connecting spring; 20. Connecting block; 21. Drive plate 22. Gear; 23. Half gear; 24. Motor; 25. Rear plate; 26. Third movable sleeve; 27. Traveling wheel; 28. Transmission screw sleeve; 29. ​​Connecting screw; 30. Mounting block; 31. Adjustment knob; 32. Rotating cavity; 33. Rotating block; 34. First limiting protrusion; 35. Second limiting protrusion; 36. Flexible sheet; 37. Handle; 38. Silicone anti-slip sleeve; 39. Magnetic suction sheet; 40. Electromagnetic block. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Example 1

[0031] Please see Figure 1-7 This invention provides a crop row marker, including a mounting plate 1. The top of the mounting plate 1 has a plurality of snap-fit ​​grooves 2 at equal intervals, and the bottom of each snap-fit ​​groove 2 is inlaid with a magnetic block 3. The outer wall of the mounting plate 1 is fitted with a plurality of first movable sleeves 4 for adapting the row spacing of the movable cavity 11, guide block 12 and rowing block 13 components. The top of the first movable sleeve 4 is hinged to a cover plate 5, and the bottom of the cover plate 5 is fixedly connected to a snap-fit ​​block 6 made of magnetic material. The snap-fit ​​block 6 passes through the top of the first movable sleeve 4 and snaps into the inside of the snap-fit ​​groove 2. The bottom of the snap-fit ​​block 6 is magnetically attracted to the top of the magnetic block 3.

[0032] By setting the first movable sleeve 4, during use, the distance between the first movable sleeves 4 can be adjusted according to the soil and planting factors required for the rowing operation by moving the first movable sleeve 4 on the outer wall of the mounting plate 1. This allows the distance between the rowing blocks 13 to be adjusted according to the soil and planting factors. After the first movable sleeve 4 is adjusted, the cover plate 5 is closed by rotating the hinge at the top of the first movable sleeve 4, so that the snap-fit ​​block 6 passes through the top of the first movable sleeve 4 and snaps into the inside of the snap-fit ​​groove 2, and magnetically attracts the top of the magnetic block 3. This method allows for quick adjustment according to soil and planting factors, and the limiting method after adjustment is very convenient to operate.

[0033] The bottom end of the first movable sleeve 4 is fixedly connected to the mounting cavity 7, and the top end of the mounting cavity 7 is fixedly connected to the insertion cavity 8. The bottom end of the insertion cavity 8 is inserted into the insertion block 9, and the outer side wall dimension of the insertion block 9 is smaller than the inner side wall dimension of the mounting cavity 7. Two return springs 14 are symmetrically fixedly connected to both sides of the insertion block 9, and the other end of the return spring 14 is fixedly connected to one end of the limiting block 15. The limiting block 15 is movably inserted into the limiting cavity. The bottom end of the insertion block 9 is fixedly connected to the connecting block 10, and the bottom end of the connecting block 10 is fixedly connected to the movable cavity 11. The movable cavity 11 is movably connected to the front and back through the guide block 12, and one end of the guide block 12 is fixedly connected to the marking block 13 for marking operations.

[0034] With the installation cavity 7 in place, during use, it is unclear whether there are hard objects in the soil. Since the components used for soil marking are the movable cavity 11, guide block 12, and marking block 13, when the guide block 12 and marking block 13 are damaged, they can be directly slid out of the movable cavity 11 for replacement. The movable cavity 11, guide block 12, and marking block 13 are fixed by connecting the connecting block 10 at the top of the movable cavity 11 and inserting the plug 9 into the installation cavity 7 connected to the bottom of the first movable sleeve 4. At the same time, the top of the plug 9 is inserted into the plug cavity 8. Then, the potential energy released by the return spring 14 drives the limiting block 15 to insert into the limiting groove, thus completing the connection and fixation. By adopting this method, the vulnerable parts in this device are easy to disassemble and assemble, facilitating later maintenance.

[0035] The rear end of the mounting plate 1 is symmetrically fixedly connected to two side plates 16. The outer walls of the two side plates 16 are each fitted with a symmetrically arranged second movable sleeve 17. A traveling plate 18 is fixedly connected between the second movable sleeves 17. A connecting spring 19 is fixedly connected to the side wall of the second movable sleeve 17 away from the traveling plate 18. The end of the connecting spring 19 away from the second movable sleeve 17 is fixedly connected to one end of the connecting block 20 fixedly connected to the side wall of the side plate 16. A drive plate 21 is fixedly connected above the rear outer wall of the traveling plate 18. The drive plate 21 and the traveling plate 18 are arranged in an "L" shape. Several teeth 22 are fixedly connected at equal intervals at the top of the drive plate 21. The outer wall of the top of the teeth 22 meshes with the outer wall of the bottom of the half gear 23. The side wall of the half gear 23 is fixedly connected to the output end of the motor 24.

[0036] By using the half-gear 23, when the device is performing row marking before crop planting, the motor 24 drives the half-gear 23 to rotate. When the half-gear 23 meshes with the equally spaced teeth 22 at the top of the drive plate 21, it drives the drive plate 21 to push the traveling plate 18 toward the mounting plate 1. After the half-gear 23 rotates to the other half turn, it engages with the equally spaced teeth 22 at the top of the drive plate 21. The potential energy of the retracting spring 19 drives the traveling plate 18 to reset. After the half-gear 23 continues to rotate, it meshes again. Through such a cyclical operation, the guide block 12 can be pushed to move toward one end of the moving cavity 11 during the cyclical movement of the traveling plate 18.

[0037] One end of each of the two side plates 16 is fixedly connected to the front end of the rear plate 25. The outer side wall of the rear plate 25 is symmetrically fitted with a third movable sleeve 26, and the front end of each third movable sleeve 26 is fixedly connected with a travel wheel 27 for assisting the movement of the device. The rear end of each third movable sleeve 26 is fixedly connected with a transmission screw sleeve 28, and the inner side wall of each transmission screw sleeve 28 is meshed with a connecting screw 29. The outer side wall thread structure of the two connecting screws 29 is set with opposite structures. The two connecting screws 29 are movably connected between two mounting blocks 30. The mounting blocks 30 are fixedly connected to the rear end of the rear plate 25. An adjustment knob 31 is movably connected between the two middle mounting blocks 30. The two ends of the adjustment knob 31 are fixedly connected to one end of the corresponding connecting screw 29.

[0038] By using the travel wheels 27, the device can move within the already marked furrows during the rowing operation before planting crops. This makes the device more labor-saving during use and effectively prevents the travel wheels 27 from being out of the furrows, which would create new furrows due to the weight of the device and make them difficult to distinguish during planting. The travel wheels 27 are adjusted by rotating the adjustment knob 31 in the forward or reverse direction. This adjustment knob 31 is linked to the connecting screws 29 connected at both ends, causing them to rotate. Since the connecting screws 29 and the transmission screw sleeves 28 form a screw drive, when the connecting screws 29 rotate, the transmission screw sleeves 28 on both sides move relative to each other or in opposite directions. This drives the third movable sleeve 26 to move synchronously, thus adjusting the spacing of the travel wheels 27 to match the furrows created after the rowing operation.

[0039] Two side plates 16 are fixedly connected to the outer walls of the mounting block 30 with rotating cavities 32. Each rotating cavity 32 has a flexible sheet 36 with a circular structure fixedly connected inside. The inner walls of the flexible sheet 36 are fixedly connected with several second limiting protrusions 35 at equal intervals. The outer walls of the second limiting protrusions 35 abut against the outer walls of the first limiting protrusions 34. The first limiting protrusions 34 are fixedly connected at equal intervals to the outer walls of the rotating block 33. The rotating block 33 is movably connected inside the rotating cavity 32 and within the flexible sheet 36. One end of the rotating block 33 extending outside the rotating cavity 32 is connected to one end of the handle 37. The upper outer wall of the handle 37 is fitted with a silicone anti-slip sleeve 38 for anti-slip protection. One end of the rotating block 33 has a groove, and a magnetic piece 39 is embedded inside the groove. One end of the magnetic piece 39 is magnetically attracted to an electromagnetic block 40, which is embedded inside the rotating cavity 32.

[0040] By using the handle 37 in conjunction with the silicone anti-slip sleeve 38, the device can be gripped and operated during row marking operations before crop planting. Based on the operator's habits and point of force application, the rotating block 33 connected to the handle 37 moves within the rotating cavity 32, thereby changing the angle between the handle 37 and the rear plate 25. After the handle 37 angle is adjusted, the first limiting protrusion 34 and the second limiting protrusion 35 abut against each other, thus self-limiting the rotating block 33. This allows the user to initially test whether the handle 37 is comfortable to use after angle adjustment. This method allows for quick adjustment of the handle 37 angle during use, increasing the device's flexibility and improving the efficiency of row marking operations before crop planting. After the handle 37 angle is adjusted, the rotating block 33 is further limited by the electromagnetic fastener 40 using the electromagnetic attraction limiter 39.

[0041] The specific usage process in this embodiment is as follows:

[0042] First, based on the soil and plant factors required for the rowing operation, the first movable sleeve 4 moves on the outer wall of the mounting plate 1 to adjust the distance between the first movable sleeves 4, thereby adjusting the distance between the rowing blocks 13 according to the soil and plant factors. At the same time, after the first movable sleeve 4 is adjusted, the cover plate 5 is closed at the top of the first movable sleeve 4 by rotating the hinge, so that the snap-fit ​​block 6 passes through the top of the first movable sleeve 4, snaps into the inside of the snap-fit ​​groove 2, and magnetically attracts the top of the magnetic block 3.

[0043] Secondly, the traveling wheels 27 move within the already marked trenches. Before using the device, the distance between the traveling wheels 27 needs to be adjusted by rotating the adjustment knob 31 in the forward or reverse direction. This adjustment knob 31 is linked to the connecting screws 29 connected at both ends, causing them to rotate. Since the connecting screws 29 and the transmission screw sleeves 28 form a screw drive, when the connecting screws 29 rotate, the transmission screw sleeves 28 on both sides move relative to each other or in opposite directions. This drives the third movable sleeve 26 to move synchronously, thus completing the adjustment of the distance between the traveling wheels 27 and adapting it to the trenches created after the marking work.

[0044] Then, by using the handle 37 in conjunction with the silicone anti-slip sleeve 38, the operator can grip and operate the device when marking rows before planting crops. According to the operator's usage habits and the point of force application, the rotating block 33 connected to the handle 37 can move inside the rotating cavity 32, thereby changing the angle between the handle 37 and the back plate 25.

[0045] Then, when the device performs the row marking operation before planting crops, the motor 24 drives the half gear 23 to rotate. When the half gear 23 meshes with the equally spaced teeth 22 at the top of the drive plate 21, it drives the drive plate 21 to push the traveling plate 18 toward the mounting plate 1. After the half gear 23 rotates to the other half turn, it engages with the equally spaced teeth 22 at the top of the drive plate 21. The potential energy of the retracting connecting spring 19 drives the traveling plate 18 to reset. After the half gear 23 continues to rotate, it meshes again. Through such a cycle, the guide block 12 can be pushed to move toward one end of the moving cavity 11 during the cyclical movement of the traveling plate 18.

[0046] Finally, the moving plate 18 moves in a cycle, thus the moving cavity 11, guide block 12 and paving block 13 are used to pave the soil. After the paving block 13 and guide block 12 come into contact with the soil, they will retract. The moving plate 18 moves in a cycle again to complete the soil paving operation. This completes the use of a crop paving device.

[0047] It should be noted that this invention is a crop rowing device, and all components are general standard parts or parts known to those skilled in the art. Its structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the matching monitoring computer and power supply, are connected by wires. The specific connection method should refer to the working principle above and complete the electrical connection in the order of operation between each electrical component. The detailed connection method is a well-known technology in the field.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crop row marker, comprising a mounting plate (1), characterized in that: The outer wall of the mounting plate (1) is provided with a plurality of first movable sleeves (4), and the bottom ends of the first movable sleeves (4) are all provided with mounting cavities (7), the bottom ends of the mounting cavities (7) are internally plugged with plug-in blocks (9), and the bottom ends of the plug-in blocks (9) are provided with connecting blocks (10), the bottom ends of the connecting blocks (10) are provided with movable cavities (11), and the inside of the movable cavities (11) is penetrated and movably connected with guide blocks (12), and one end of the guide blocks (12) is provided with A rowing block (13), the rear end of the mounting plate (1) is symmetrically mounted with a side plate (16), and the outer side walls of the side plates (16) are sleeved with a second movable sleeve (17), the second movable sleeve (17) is connected with a traveling plate (18), one end of the traveling plate (18) is mounted with a driving plate (21), and the top end of the driving plate (21) is evenly spaced with latch teeth (22), and the top end of the driving plate (21) is meshed with the bottom end of the half gear (23) through the latch teeth (22).

2. The crop row marker according to claim 1, characterized in that: The top of the installation plate (1) is provided with clamping grooves (2) at equal intervals, and magnetic blocks (3) are embedded inside the clamping grooves (2).

3. The crop row marker according to claim 1, characterized in that: The top end of the first movable sleeve (4) is hingedly connected to a cover plate (5) via a hinge, and a clamping block (6) is installed at the bottom end of the cover plate (5). The clamping block (6) is a magnetic material structure, and the clamping block (6) is clamped inside the clamping groove (2) and is magnetically attracted to the top end of the magnetic attraction block (3).

4. The crop row marker according to claim 1, characterized in that: The top end of the plug-in block (9) is plugged into the interior of the installation cavity (7) and is plugged into the interior of the bottom end of the plug-in cavity (8); the plug-in cavity (8) is installed at the top end of the interior of the installation cavity (7); return springs (14) are symmetrically installed on both sides of the installation cavity (7); one end of the return spring (14) is internally connected to one end of the limit block (15); the other end of the limit block (15) passes through the interior of the limit cavity; and the limit cavity is opened on both sides of the installation cavity (7).

5. The crop row marker according to claim 1, characterized in that: A connecting spring (19) is installed on the side wall of the second movable sleeve (17) away from the traveling plate (18), and the other end of the connecting spring (19) is connected to one end of a connecting block (20), and the connecting block (20) is installed on the outer side wall of the side plate (16).

6. The crop row marker according to claim 1, characterized in that: One side of the half gear (23) is connected to the output end of the motor (24), and the motor (24) is mounted on the side wall of the connecting block, the connecting block is mounted on the top of the rear plate (25), and the rear plate (25) is mounted on an end of the side plate (16) away from the mounting plate (1).

7. The crop row marker according to claim 6, characterized in that: The outer side wall of the rear plate (25) is sleeved with a third movable sleeve (26), and a travel wheel (27) is installed at the front end of the third movable sleeve (26).

8. The crop row marker according to claim 7, characterized in that: A transmission screw sleeve (28) is installed at the rear end of the third movable sleeve (26), and the inner wall of the transmission screw sleeve (28) is meshedly connected with a connecting screw (29), the connecting screw (29) is movably connected between two mounting blocks (30), and the mounting blocks (30) are symmetrically mounted at the rear end of the rear plate (25), and an adjusting knob (31) is connected between the connecting screws (29), and the outer wall teeth of the connecting screws (29) on both sides are arranged in opposite structures.

9. The crop row marker according to claim 1, characterized in that: The side walls of the side panels (16) are all provided with rotating cavities (32), and the interior of the rotating cavities (32) is movably connected with rotating blocks (33), one end of the rotating blocks (33) extends to the outside of the rotating cavities (32) and is connected to one end of a handle (37), and the upper outer wall of the handle (37) is provided with a silicone anti-slip sleeve (38).

10. The crop row marker according to claim 9, characterized in that: The rotating block (33) is provided with first limiting protrusions (34) at equal intervals on the outer side wall of the rotating cavity (32), and the outer side wall of the first limiting protrusion (34) abuts against the outer side wall of the second limiting protrusion (35), and the second limiting protrusions (35) are provided at equal intervals on the inner side wall of the flexible sheet (36), and the flexible sheet (36) is provided inside the rotating cavity (32).

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