Mulching film laying device for agricultural planting

Abstract

The invention relates to the technical field of mulching film laying, and discloses an agricultural planting mulching film laying device which comprises a vehicle body and a mulching film roll installed on one side of the vehicle body, a box body is fixedly installed on the vehicle body, a fixing cylinder is fixedly installed at the lower end of the box body, sliding cylinders are slidably arranged on the two sides of the fixing cylinder, and feeding ports are formed in the outer sides of the sliding cylinders; a feeding shell is rotationally installed on one side of the upper end of the box body, a spring rotating shaft rotationally connected with the feeding shell is rotationally installed in a containing cavity, the lower end of an L-shaped push plate in the containing cavity abuts against an inclined plate on one side of the spring rotating shaft, a circular ring is driven to rotate when a motor works, and the feeding shell is driven to rotate; the circular ring pushes the L-shaped push plate to move downwards during rotation, so that the feeding shell rotates, soil is supplemented into the box body, the feeding shell can rotate repeatedly through cooperation of the spring and the rotating shaft, the soil can be continuously supplemented into the box body, and work does not need to be stopped in the whole laying process for supplementing the soil.

Description

Technical Field

[0001] The present invention relates to the technical field of metal composite material production equipment, and particularly to a film laying device for agricultural planting land. Background Art

[0002] In agricultural planting, in order to provide an excellent environment for seed germination, a film is generally laid. During the film laying process, devices such as a trolley are generally used to place the film to facilitate the laying work. An existing film laying device, such as a film laying device disclosed in the authorized publication number CN220965816U, includes a support plate; a telescopic adjustable mounting frame provided on the support plate for assembling the film; a placement box assembled on the support plate; a corrugated pipe installed on one side of the placement box, and a discharge pipe is installed on the corrugated pipe, and the discharge pipe is located on one side of the telescopic adjustable mounting frame; a film guiding mechanism provided on the support plate for guiding the film. The provided film laying device can fix the film while laying the film, thereby ensuring that the film will not be blown disorderly by the wind, and at the same time has the advantage of not requiring multiple people to operate.

[0003] When laying the film, first lay the film on the ridge, and then cover the soil on both sides of the film to fix the film. Similar to the above prior art, the soil in the placement box is poured onto the film through the discharge pipe. However, the amount of soil in the placement box is limited, and since the film laid during farmland planting is relatively long and more soil is required, after the soil in the placement box is used up, the laying work needs to be stopped to add soil to the placement box. During the entire laying process, the work needs to be repeatedly stopped to add soil, which reduces the work efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a film laying device for agricultural planting that can automatically add soil to fix the film.

[0005] To achieve the above object, the present invention provides the following technical solution: A device for laying plastic film on agricultural planting land, including a vehicle body and a plastic film roll installed on one side of the vehicle body. A box body is fixedly installed on the vehicle body. A fixed cylinder is fixedly installed at the lower end of the box body. Slide cylinders are slidably arranged on both sides of the fixed cylinder. A feed inlet is opened on the outer side of the slide cylinder. An outlet communicating with the feed inlet is opened at the lower end of the box body. A feeding component is rotatably installed in the slide cylinder. A feed housing is rotatably installed on one side at the upper end of the box body. A mounting member for installing the plastic film roll is slidably arranged on the vehicle body. A connecting member is arranged between the mounting member and the feeding component. A rotating component for controlling the rotation of the feeding component is rotatably installed in the slide cylinder. A mounting plate is fixedly installed on the box body. A motor is fixedly installed at the upper end of the mounting plate. A stirring component for controlling the rotation of the rotating component is fixedly installed at the output end of the motor. A pushing component for controlling the rotation of the feed housing is arranged inside the mounting plate. The motor also works to control the movement of the pushing component.

[0006] Preferably, the feeding component includes a round rod rotatably connected to the slide cylinder. A spiral feeding plate is fixedly sleeved on the outer side of the round rod. A round plate is fixedly installed on one side of the inside of the slide cylinder where the feed inlet is located. The round rod is rotatably connected to the round plate.

[0007] Preferably, the rotating component includes a connecting cylinder rotatably connected to the fixed cylinder. A rectangular opening is formed through one end of the connecting cylinder. Two rectangular rods are slidably arranged in the rectangular opening. The two rectangular rods are respectively fixedly connected to the round rods at the corresponding positions. A second bevel gear is fixedly sleeved on the outer side of the connecting cylinder.

[0008] Preferably, the stirring component includes a rotating rod fixedly connected to the output end of the motor. A plurality of stirring blades are arranged on the outer side of the rotating rod. A first bevel gear is fixedly connected to the lower end of the rotating rod inside the fixed cylinder. The first bevel gear meshes with the second bevel gear.

[0009] Preferably, a placement cavity communicating with each other is formed between the mounting plate and the box body. The pushing component includes an L-shaped push plate slidably connected to the placement cavity. A connecting spring is arranged between the L-shaped push plate and the placement cavity. A spring rotating shaft rotatably connected to the feed housing is rotatably installed in the placement cavity. An inclined plate is fixedly installed on one side of the spring rotating shaft. The lower end of the L-shaped push plate abuts against the inclined plate. A ring is fixedly sleeved on the output end of the motor inside the placement cavity. An inclined opening is formed at the lower end of the ring. The lower end of the ring is in sliding contact with the upper end of the L-shaped push plate.

[0010] Preferably, a limiting chute is formed on one side of the vehicle body. The mounting member includes two limiting sliders slidable in the limiting chute. A mounting frame is fixedly installed on the lower side of the limiting slider. A conical rotating shaft is rotatably installed on the mounting frame. The sleeve inside the plastic film roll is sleeved on the conical rotating shaft. A telescopic spring is arranged between the limiting slider and the limiting chute.

[0011] Preferably, the connecting member includes a connecting housing fixedly installed on the mounting frame. Two pulleys are rotatably installed in the connecting housing. A transmission belt is sleeved between the two pulleys. The conical rotating shaft and the round rod are respectively fixedly connected to the corresponding pulleys.

[0012] Preferably, a shovel plate is fixedly installed at the lower end of the feeding housing.

[0013] Preferably, a discharge cylinder is fixedly communicated with the outside of the sliding cylinder. Both of the two discharge cylinders are located inside both ends of the plastic film roll.

[0014] Preferably, a connecting gear is rotatably installed in the limiting chute. Tooth plates that are engaged with both sides of the connecting gear and are slidably connected to the limiting chute are provided. The tooth plates are fixedly connected to the limiting sliders.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, the feeding housing is rotatably installed on one side of the upper end of the box body, the spring rotating shaft that is rotationally connected to the feeding housing is rotatably installed in the placement cavity. The lower end of the L-shaped push plate in the placement cavity abuts against the inclined plate on one side of the spring rotating shaft. When the motor works, it drives the ring to rotate. When the ring rotates, it pushes the L-shaped push plate to move downward, so that the feeding housing rotates, and soil is replenished into the box body. Through the cooperation of the spring rotating shaft, the feeding housing can rotate repeatedly, and soil can be continuously replenished into the box body. The entire laying process does not need to stop working to replenish soil.

[0017] 2. In the present invention, a limiting slider is slidably arranged in the limiting chute of the vehicle body, a mounting frame is fixedly installed on the lower side of the limiting slider, a conical rotating shaft is rotatably installed on the mounting frame. When the plastic film roll is installed, the sleeve inside the plastic film roll is sleeved on the conical rotating shaft, and the distance between the two conical rotating shafts can be adjusted to cooperate with the installation of plastic film rolls of different widths.

[0018] 3. In the present invention, sliding cylinders are slidably arranged on both sides of the fixed cylinder, a connecting cylinder is rotatably connected in the fixed cylinder, a rectangular rod is slidably arranged in the rectangular opening of the connecting cylinder, the rectangular rod is fixedly connected to the round rod. When the motor works, through the cooperation of the first bevel gear and the second bevel gear, the soil in the box body can be poured onto the plastic film, and when installing plastic film rolls of different widths, the positions of the two discharge cylinders change with the change of the distance between the two conical rotating shafts, so as to fix plastic films of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic three-dimensional structure diagram of the whole of the present invention;

[0020] Figure 2 is a schematic three-dimensional sectional structure diagram of the whole of the present invention;

[0021] Figure 3 is Figure 2 The enlarged structural schematic diagram of A in

[0022] Figure 4 is Figure 2 The enlarged structural schematic diagram of C in

[0023] Figure 5 The three-dimensional sectional structural schematic diagram of the mounting plate of the present invention;

[0024] Figure 6 is Figure 5 The enlarged structural schematic diagram of B in

[0025] Figure 7 The connection structural schematic diagram of the sliding cylinder and the fixed cylinder of the present invention;

[0026] Figure 8 The three-dimensional sectional structural schematic diagram of the connection housing of the present invention;

[0027] Figure 9 is Figure 8 The enlarged structural schematic diagram of D in

[0028] Figure 10 The three-dimensional sectional structural schematic diagram of the conical rotating shaft of the present invention.

[0029] In the figure: 1, vehicle body; 2, plastic film roll; 3, feeding housing; 4, shovel plate; 5, connection housing; 6, motor; 7, mounting plate; 8, box body; 9, stirring blade; 10, discharge cylinder; 11, sliding cylinder; 12, conveyor belt; 13, belt pulley; 14, connecting gear; 15, L-shaped push plate; 16, rotating rod; 17, placement cavity; 18, ring; 19, spring rotating shaft; 20, connecting spring; 21, inclined plate; 22, telescopic spring; 23, first bevel gear; 24, round plate; 25, spiral feeding plate; 26, fixed cylinder; 27, mounting frame; 28, conical rotating shaft; 29, outlet; 30, round rod; 31, rectangular rod; 32, connecting cylinder; 33, second bevel gear; 34, feeding port; 35, limiting chute; 36, limiting slider; 37, toothed plate. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Please refer to Figures 1-10, An agricultural planting plastic film laying device, including a vehicle body 1 and a plastic film roll 2 installed on one side of the vehicle body 1 (the plastic film roll 2 includes an inner sleeve and the plastic film wound around the outer side of the sleeve). A box body 8 is fixedly installed on the vehicle body 1. A fixed cylinder 26 is fixedly installed at the lower end of the box body 8. Slide cylinders 11 are slidably arranged on both sides of the fixed cylinder 26. A feed inlet 34 is opened on the outer side of the slide cylinder 11. An outlet 29 communicating with the feed inlet 34 is opened at the lower end of the box body 8. A feeding component is rotatably installed in the slide cylinder 11. A feed housing 3 is rotatably installed on one side of the upper end of the box body 8. A shovel plate 4 is fixedly installed at the lower end of the feed housing 3, which is convenient for shoveling the soil on one side of the ridge into the feed housing 3. An installation part for installing the plastic film roll 2 is slidably arranged on the vehicle body 1. A connecting part is arranged between the installation part and the feeding component. A rotating component for controlling the rotation of the feeding component is rotatably installed in the slide cylinder 11. An installation plate 7 is fixedly installed on the box body 8. A motor 6 is fixedly installed at the upper end of the installation plate 7. A stirring component for controlling the rotation of the rotating component is fixedly installed at the output end of the motor 6. A pushing component for controlling the rotation of the feed housing 3 is arranged in the installation plate 7. The motor 6 also works to control the movement of the pushing component. A placement cavity 17 communicating with each other is opened between the installation plate 7 and the box body 8. The pushing component includes an L-shaped push plate 15 slidably connected to the placement cavity 17. A connecting spring 20 is arranged between the L-shaped push plate 15 and the placement cavity 17. A spring rotating shaft 19 rotatably connected to the feed housing 3 is rotatably installed in the placement cavity 17. An inclined plate 21 is fixedly installed on one side of the spring rotating shaft 19. The lower end of the L-shaped push plate 15 abuts against the inclined plate 21. A ring 18 is fixedly sleeved at the output end of the motor 6 located in the placement cavity 17. An inclined opening is opened at the lower end of the ring 18 (half of the lower end of the ring 18 is horizontally arranged and half is inclined). The lower end of the ring 18 is in sliding contact with the upper end of the L-shaped push plate 15. When the motor 6 works to drive the ring 18 to rotate, when the lower end of the ring 18 is in the inclined position and contacts the L-shaped push plate 15 during rotation, it will push the L-shaped push plate 15 downward, and the connecting spring 20 is compressed. The L-shaped push plate 15 pushes the inclined plate 21 to move, so that the spring rotating shaft 19 drives the feed housing 3 to rotate and replenish the soil into the box body 8. Through the cooperation of the spring rotating shaft 19, the feed housing 3 can rotate repeatedly, and the soil can be continuously replenished into the box body 8. The entire laying process does not need to stop working to replenish the soil. When the lower end of the ring 18 is in the horizontal position and contacts the L-shaped push plate 15, due to the action of the connecting spring 20, the L-shaped push plate 15 resets. After the extrusion limit is released, the spring rotating shaft 19 will drive the feed housing 3 to rotate and reset. When the L-shaped push plate 15 contacts the horizontal position of the lower end of the ring 18, it is used for the shoveling work of the shovel plate 4.

[0032] As a further technical solution of the present invention, the stirring assembly includes a rotating rod 16 fixedly connected to the output end of the motor 6. A plurality of stirring blades 9 are arranged on the outer side of the rotating rod 16. The lower end of the rotating rod 16 is fixedly connected with a first bevel gear 23 inside the fixed cylinder 26. During the operation of the motor 6, the rotating rod 16 is also driven to rotate, so that the stirring blades 9 move to break up the soil in the box body 8, avoiding too large soil blocks and making it easier to damage the plastic film.

[0033] As a further technical solution of the present invention, the feeding assembly includes a round rod 30 rotatably connected to the sliding cylinder 11. A spiral feeding plate 25 is fixedly sleeved on the outer side of the round rod 30. Inside the sliding cylinder 11, a round plate 24 is fixedly installed on one side of the feeding port 34. The round rod 30 is rotatably connected to the round plate 24. The rotating assembly includes a connecting cylinder 32 rotatably connected to the fixed cylinder 26. One end of the connecting cylinder 32 is provided with a rectangular opening. Two rectangular rods 31 are slidably arranged in the rectangular opening. The two rectangular rods 31 are respectively fixedly connected to the corresponding round rods 30. A second bevel gear 33 is fixedly sleeved on the outer side of the connecting cylinder 32. The first bevel gear 23 meshes with the second bevel gear 33. The outer side of the sliding cylinder 11 is fixedly communicated with a discharge cylinder 10. Both discharge cylinders 10 are located inside the two ends of the plastic film roll 2. During the operation of the motor 6, the first bevel gear 23 is also driven to rotate through the rotating rod 16. The connecting cylinder 32 is driven to rotate through the cooperation of the second bevel gear 33. The connecting cylinder 32 drives the rectangular rods 31 and the round rod 30 to rotate, so as to control the rotation of the spiral feeding plate 25 and transmit the soil through the discharge cylinder 10 to cover the two side edges of the plastic film.

[0034] As a further technical solution of the present invention, a limiting chute 35 is opened on one side of the vehicle body 1. The mounting member includes two limiting sliders 36 sliding in the limiting chute 35. An installation frame 27 is fixedly installed on the lower side of the limiting slider 36. A conical rotating shaft 28 is rotatably installed on the installation frame 27. The sleeve inside the plastic film roll 2 is sleeved on the conical rotating shaft 28. A telescopic spring 22 is arranged between the limiting slider 36 and the limiting chute 35. When the plastic film roll 2 is installed, the sleeve inside the plastic film roll 2 is sleeved on the conical rotating shaft 28. The distance between the two conical rotating shafts 28 is adjustable, which is used to cooperate with the installation of plastic film rolls 2 of different widths.

[0035] As a further technical solution of the present invention, the connecting member includes a connecting housing 5 fixedly installed on the mounting frame 27. Two pulleys 13 are rotatably installed in the connecting housing 5. A conveyor belt 12 is sleeved between the two pulleys 13. The conical rotating shaft 28 and the round rod 30 are respectively fixedly connected to the corresponding pulleys 13. When the motor 6 works, through the cooperation of the first conical gear 23 and the second conical gear 33, the soil in the box body 8 is poured onto the plastic film. When fixing plastic films of different widths, since the mounting frame 27 and the round rod 30 move synchronously, when adjusting the distance between the two conical rotating shafts 28, the positions of the two discharge cylinders 10 also change accordingly, so as to fix plastic films of different widths.

[0036] As a further technical solution of the present invention, a connecting gear 14 is rotatably installed in the limit chute 35. Tooth plates 37 meshing with both sides of the connecting gear 14 are arranged and are slidably connected to the limit chute 35. The tooth plates 37 are fixedly connected to the limit sliders 36, so that the sliding cylinders 11 on both sides move the same distance.

[0037] Working principle:

[0038] While pulling the vehicle body 1 to move, start the motor 6 to work. The motor 6 drives the rotating rod 16 and the ring 18 to rotate;

[0039] When the lower inclined position of the ring 18 contacts the L-shaped push plate 15 during rotation, it will push the L-shaped push plate 15 downward, and the connecting spring 20 is compressed. The L-shaped push plate 15 pushes the inclined plate 21 to move, so that the spring rotating shaft 19 drives the feeding housing 3 to rotate, and soil is replenished into the box body 8. When the lower horizontal position of the ring 18 contacts the L-shaped push plate 15, due to the action of the connecting spring 20, the L-shaped push plate 15 resets. After releasing the extrusion limit, the spring rotating shaft 19 will drive the feeding housing 3 to rotate and reset. When the L-shaped push plate 15 contacts the horizontal position at the lower end of the ring 18, it is used for the soil shoveling work of the shovel plate 4;

[0040] The rotating rod 16 rotates to drive the stirring blade 9 and the first conical gear 23 to rotate;

[0041] The stirring blade 9 moves to disperse the soil in the box body 8, preventing the soil blocks from being too large and being more likely to damage the plastic film. The soil enters the sliding cylinder 11 through the outlet 29 and the inlet 34;

[0042] The rotation of the first bevel gear 23 drives the rotation of the second bevel gear 33. The second bevel gear 33 drives the rotation of the connecting cylinder 32, and the connecting cylinder 32 drives the rotation of the rectangular rod 31 and the round rod 30 (when the round rod 30 rotates, it will drive the pulley 13 connected to it. Through the cooperation of another pulley 13 and the conveyor belt 12, the rotation of the conical rotating shaft 28 can be controlled, so that the plastic film roll 2 rotates to loosen the plastic film for laying work), which is used to control the rotation of the spiral feeding plate 25, and convey the soil out through the discharge cylinder 10 to cover the two side edges of the plastic film;

[0043] When installing the plastic film roll 2, first push the mounting frame 27 to control the limit slider 36 to slide in the limit chute 35 (when the limit slider 36 moves, it drives the toothed plate 37 to move. Through the rotation of the connecting gear 14, the moving distances of the two sliding cylinders 11 on both sides are the same), the telescopic spring 22 is compressed, and the distance between the two conical rotating shafts 28 is enlarged. Then, one end of the sleeve of the plastic film roll 2 is connected to one of the conical rotating shafts 28, and then the other conical rotating shaft 28 is controlled to be connected to the other end of the sleeve. After the plastic film roll 2 is installed, the telescopic spring 22 is also in a compressed state;

[0044] During the movement of the mounting frame 27, it will drive the connecting housing 5 and the round rod 30 to move. The round rod 30 pulls the sliding cylinder 11 to move. Therefore, when adjusting the distance between the two conical rotating shafts 28, the positions of the two discharge cylinders 10 also change accordingly, which is used to fix plastic films of different widths.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art may make equivalent replacements for its features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An agricultural planting plastic film laying device, comprising a vehicle body (1) and a plastic film roll (2) installed on one side of the vehicle body (1), characterized in that, A box body (8) is fixedly installed on the vehicle body (1). A fixed cylinder (26) is fixedly installed at the lower end of the box body (8). Slide cylinders (11) are slidably arranged on both sides of the fixed cylinder (26). A feed inlet (34) is formed on the outer side of the slide cylinder (11). An outlet (29) communicating with the feed inlet (34) is formed at the lower end of the box body (8). A feeding assembly is rotatably installed in the slide cylinder (11). A feed housing (3) is rotatably installed at one side of the upper end of the box body (8). A mounting member for mounting a plastic film roll (2) is slidably arranged on the vehicle body (1). A connecting member is arranged between the mounting member and the feeding assembly. A rotating assembly for controlling the rotation of the feeding assembly is rotatably installed in the slide cylinder (11). A mounting plate (7) is fixedly installed on the box body (8). A motor (6) is fixedly installed at the upper end of the mounting plate (7). A stirring assembly for controlling the rotation of the rotating assembly is fixedly installed at the output end of the motor (6). A pushing assembly for controlling the rotation of the feed housing (3) is arranged in the mounting plate (7). The operation of the motor (6) is also used to control the movement of the pushing assembly.

2. The agricultural planting ground film laying device according to claim 1, characterized in that, The feeding assembly includes a round rod (30) rotatably connected to the slide cylinder (11). A spiral feeding plate (25) is fixedly sleeved on the outer side of the round rod (30). A round plate (24) is fixedly installed inside the slide cylinder (11) on one side of the feed inlet (34). The round rod (30) is rotatably connected to the round plate (24).

3. The agricultural planting ground film laying device according to claim 2, characterized in that, The rotating assembly includes a connecting cylinder (32) rotatably connected to the fixed cylinder (26). A rectangular opening is formed through one end of the connecting cylinder (32). Two rectangular rods (31) are slidably arranged in the rectangular opening. The two rectangular rods (31) are respectively fixedly connected to the corresponding round rods (30). A second bevel gear (33) is fixedly sleeved on the outer side of the connecting cylinder (32).

4. The agricultural planting ground film laying device according to claim 3, characterized in that, The stirring assembly includes a rotating rod (16) fixedly connected to the output end of the motor (6). A plurality of stirring blades (9) are arranged on the outer side of the rotating rod (16). A first bevel gear (23) is fixedly connected to the lower end of the rotating rod (16) inside the fixed cylinder (26). The first bevel gear (23) meshes with the second bevel gear (33).

5. The agricultural planting ground film laying device according to claim 4, characterized in that, A placement cavity (17) communicating with each other is formed between the mounting plate (7) and the box body (8). The pushing assembly includes an L-shaped push plate (15) slidably connected to the placement cavity (17). A connecting spring (20) is arranged between the L-shaped push plate (15) and the placement cavity (17). A spring rotating shaft (19) rotatably connected to the feed housing (3) is rotatably installed in the placement cavity (17). An inclined plate (21) is fixedly installed on one side of the spring rotating shaft (19). The lower end of the L-shaped push plate (15) abuts against the inclined plate (21). A ring (18) is fixedly sleeved on the output end of the motor (6) inside the placement cavity (17). An inclined opening is formed at the lower end of the ring (18). The lower end of the ring (18) is in sliding contact with the upper end of the L-shaped push plate (15).

6. The agricultural planting ground film laying device according to claim 5, characterized in that, A limiting chute (35) is provided on one side of the vehicle body (1). The mounting member includes two limiting sliders (36) that slide in the limiting chute (35). An installation frame (27) is fixedly installed on the lower side of the limiting slider (36). A conical rotating shaft (28) is rotatably installed on the installation frame (27). The sleeve inside the plastic film roll (2) is sleeved on the conical rotating shaft (28). A telescopic spring (22) is provided between the limiting slider (36) and the limiting chute (35).

7. The agricultural planting ground film laying device according to claim 6, characterized in that, The connecting member includes a connecting housing (5) fixedly installed on the installation frame (27). Two belt pulleys (13) are rotatably installed in the connecting housing (5). A transmission belt (12) is sleeved between the two belt pulleys (13). The conical rotating shaft (28) and the round rod (30) are respectively fixedly connected to the corresponding belt pulleys (13).

8. The agricultural planting ground film laying device according to claim 7, characterized in that, A shovel plate (4) is fixedly installed at the lower end of the feeding housing (3).

9. The agricultural planting ground film laying device according to claim 8, characterized in that, An outlet cylinder (10) is fixedly communicated with the outside of the sliding cylinder (11). Both of the two outlet cylinders (10) are located inside both ends of the plastic film roll (2).

10. The mulch film laying device for agricultural planting according to claim 9, characterized in that, A connecting gear (14) is rotatably installed in the limiting chute (35). Tooth plates (37) that are slidably connected to the limiting chute (35) are meshed on both sides of the connecting gear (14). The tooth plates (37) are fixedly connected to the limiting sliders (36).

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