CN112673772A

CN112673772A - Agricultural seeding device

Info

Publication number: CN112673772A
Application number: CN202011514911.8A
Authority: CN
Inventors: 杨成良
Original assignee: Individual
Current assignee: Ningxia Wanzhong Agricultural Mechanization Service Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-20
Anticipated expiration: 2040-12-21
Also published as: CN112673772B

Abstract

The invention discloses an agricultural seeding device, and relates to the technical field of agricultural seeding. This agricultural seeder includes the device main part, both sides are run through by the pivot and are connected with the pivot rotation around the device main part, the equal fixed mounting in pivot both ends has the gyro wheel, the pivot is passed through the chain and is connected with the transmission of seeding plectane, seeding plectane top and the laminating of storage silo bottom both sides. According to the agricultural seeding device, the seeding circular plate can rotate in the moving process of the device main body, soybean seeds in the storage bin can be fed by arranging the arc-shaped material distribution channel in the seeding circular plate, so that the soybean seeds can be uniformly fed, and in the feeding process, the seeds with smaller volume pass through the arc-shaped material distribution channel and are moved out of the seeding circular plate, and finally are stored in the device main body; seeds with larger volume can stay in the arc-shaped material distribution channel and rotate along with the seeding circular plate, and are finally discharged from the discharge pipe; so as to realize screening out the soybean seeds with smaller volume in the sowing process.

Description

Agricultural seeding device

Technical Field

The invention relates to the technical field of agricultural seeding, in particular to an agricultural seeding device.

Background

Agriculture is an industry for obtaining products by artificial cultivation by utilizing growth and development rules of animals and plants. Agriculture belongs to the first industry, and the science for researching agriculture is agriculture. The agricultural working object is living animals and plants, and the obtained products are the animals and plants. Agriculture is a fundamental industry for supporting national economic construction and development. One of crop cultivation measures in sowing. The seeding material is timely sowed into a soil layer with a certain depth according to a certain quantity and mode. Whether sowing is proper or not directly influences the growth and the yield of crops. In order to improve the seeding quality, seed treatment, preparation for labor, animal power, seeding machines and the like are required in addition to fine soil preparation before seeding.

Soybeans are commonly known as soybeans. Is an annual herb of Dicotyledoneae, Leguminosae and Glycine, and has a height of 30-90 cm. The stem is thick, upright and densely covered by brown long bristles. The leaves typically have 3 leaflets; the leaves have veins and are soft yellow; the leaf stalk is 2-20 cm long; lobular wide oval, paper; the total inflorescence is short and has few flowers and many flowers; the total peduncle usually has 5-8 tightly squeezed flowers without stalks; wrapping bract in needle shape, and coating with coarse hair; the small bract is wrapped in a needle shape and is wrapped with seta; the calyx is in the shape of a needle, the flower is purple, light purple or white, the base part is provided with a petal handle, and the petal is in the shape of a castor. In order to improve soybean seeding efficiency among the prior art, soybean seeding accessible agricultural machine sows, but current soybean seeder can't screen out the less seed of volume, and various nutrition uneven seeds are sowed by seeder, and then cause the uneven growth of soybean, have also reduced the output of soybean. And the soybean seeds are only screened by the screen, so that the screening is laborious, and all the seeds with smaller volume cannot be screened out, and the screening effect is poor.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an agricultural seeding device, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: an agricultural seeding device comprises a device main body, wherein the front side and the rear side of the device main body are penetrated by a rotating shaft and are rotationally connected with the rotating shaft, the two ends of the rotating shaft are both fixedly provided with rollers, the rotating shaft is in transmission connection with the seeding circular plate through a chain, the top of the seeding circular plate is attached to two sides of the bottom of the storage bin, the top of the storage bin is communicated with the outside, the bottom of the seeding circular plate is provided with a discharge pipe, the bottom end of the discharge pipe is arranged at the bottom of the device main body, the device main body is communicated with the outside through the discharge pipe, the right side of the discharge pipe is provided with a guide block which is fixed inside the device main body, an arc-shaped material distribution channel is hollowed inside the seeding circular plate, the seeding circular plate is communicated with the inside of the device main body through the arc-shaped material distribution channel, the quantity of the arc-shaped material distribution channels is two, and the two arc-shaped material distribution channels are symmetrically arranged inside the seeding circular plate.

Preferably, arc divides material passageway one end to be provided with and blocks, and the inside both sides of the other end are installed guide piece one and guide piece two respectively, block piece including rotating and block piece and toper stopper, it rotates and installs inside the arc divides material passageway to rotate to block piece one end, and other end fixed mounting has the balancing weight, toper stopper fixed mounting is inside the arc divides material passageway, toper stopper endpoint department blocks the piece laminating with rotating.

Preferably, the arc divides the inside of material passageway to undercut to have a plurality of arc walls, the inside anti-reflux piece of rotating of arc wall is installed, anti-reflux piece one side is connected with the arc wall inner wall through the spring.

Preferably, the arc divides the material passageway to keep away from the one end both sides that stop piece and all is provided with cavity one, cavity one is seted up inside the seeding plectane, the part that the seeding plectane is located cavity one both sides is fixed with a shell fragment both ends respectively, the shell fragment is outside outstanding earlier on a cavity, the sunken side center department of shell fragment is fixed with two one ends of shell fragment, two other ends of shell fragment are fixed inside cavity one, two protruding side center departments of shell fragment are fixed with slide bar one end, the slide bar other end and dwang side sliding connection, dwang one end is rotated and is installed inside cavity one, and the other end welding has the bar ejector pad, storage silo bottom inner wall right side is rotated and is installed anti-clogging plate, anti-clogging plate top is passed through spring and storage silo.

Preferably, a first guide vane is fixedly mounted inside the arc-shaped material distribution channel, one end of the second guide vane is rotatably mounted inside the arc-shaped material distribution channel, the other end of the second guide vane is fixedly mounted with a first spherical plug, the first spherical plug is movably connected with one end of the second cavity, the other end of the second cavity is movably connected with the second spherical plug, the second cavity is arranged on one side of the second guide vane, which is far away from the first guide vane, a first arc-shaped positioning plate is fixedly mounted at one end of the second spherical plug, a first lug and a second lug are arranged on the arc-shaped positioning plate in a protruding mode, a through hole is formed in the part, located between the first lug and the second lug, of the second arc-shaped positioning plate, one side of the through hole is attached to.

Preferably, the part of the arc-shaped positioning plate between the through hole and the second bump is attached to one end of the positioning rod, the other end of the positioning rod is fixed to the concave side of the arc-shaped limiting block, the diameter of the positioning rod is smaller than the aperture of the through hole, the arc-shaped limiting block is rotatably installed on the seeding circular plate, the convex side of the arc-shaped limiting block is in a sawtooth shape, the concave side is connected with the seeding circular plate through a third elastic sheet, the center of the convex side of the third elastic sheet is fixed to one end of an elastic rope, the other end of the elastic rope is fixed to a transmission rod, one end of the transmission rod is slidably connected with the inner wall of the first.

(III) advantageous effects

The invention provides an agricultural seeding device. The method has the following beneficial effects:

(1) according to the agricultural seeding device, the seeding circular plate can rotate in the moving process of the device main body, soybean seeds in the storage bin can be fed through the arc-shaped material distribution channel arranged in the seeding circular plate, so that the uniform feeding of the soybean seeds is realized, and in the feeding process, the seeds with smaller volume pass through the arc-shaped material distribution channel and are moved out of the seeding circular plate, and finally are stored in the device main body; seeds with larger volume can stay in the arc-shaped material distribution channel and rotate along with the seeding circular plate, and are finally discharged from the discharge pipe; so as to realize screening out the soybean seeds with smaller volume in the sowing process.

(2) This agricultural seeder blocks through setting up and to block the soybean seed that can block in the storage silo, prevents that the soybean seed from dividing the material passageway from the arc and keeping away from that the one end of guide piece one and guide piece two enters into the arc divides the material passageway inside and influence the seeding to ensure the seeding effect of seeding plectane.

(3) This agricultural seeder can prevent through setting up anti-return piece that the less soybean seed of volume from removing the in-process backward flow in the arc divides the material passageway to prevent that the seeding plectane from rotating probably remaining soybean seed in the in-process arc divides the material passageway and producing the influence to the seeding.

(4) This agricultural seeder, seeding plectane rotate in-process storage silo bottom can compress cavity one to under the effect of shell fragment one, shell fragment two, slide bar and dwang, the bar ejector pad can rotate, under the cooperation of bar ejector pad and anti-clogging plate is used, can dredge the soybean seed of storage silo bottom, prevent that soybean seed from blockking up in the storage silo bottom.

(5) This agricultural seeder can fix the seeding plectane in the storage silo bottom through setting up the arc stopper to only when the arc divides the inside great full seed that exists of material passageway, the arc stopper just can break away from the storage silo bottom, thereby prevents that seeding plectane slew velocity is too fast and leads to the arc to divide the inside device main part still to move forward when not having the seed of material passageway, thereby can prevent that the device from appearing the condition of leaking kind.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an overall cutaway view of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2 according to the present invention;

FIG. 4 is a sectional view of a circular seeding plate according to the present invention;

FIG. 5 is an enlarged view of portion B of FIG. 4 according to the present invention;

FIG. 6 is an enlarged view of the portion C of FIG. 4 according to the present invention;

FIG. 7 is an enlarged view of the portion D of FIG. 4 according to the present invention;

FIG. 8 is an enlarged view of portion E of FIG. 7 according to the present invention;

FIG. 9 is an enlarged view of portion F of FIG. 7 according to the present invention;

FIG. 10 is a cut-away view of the arcuate positioning plate of the present invention.

In the figure: the device comprises a device main body 1, a rotating shaft 2, a roller 21, a seeding circular plate 3, an arc-shaped material distribution channel 31, a 311 blocking piece, a1 rotation blocking piece, a2 conical limiting block, a3 balancing weight, a 312 guide piece I, a 313 guide piece II, a 314 arc-shaped groove, a 315 backflow prevention piece, a 32 cavity I, a 321 elastic piece I, a 322 elastic piece II, a 323 sliding rod, a 324 rotating rod, a 325 strip-shaped pushing block, a 33 cavity II, a 331 spherical plug I, a 332 spherical plug II, a 34 arc-shaped positioning plate, a c1 convex block I, a c2 convex block II, a c3 through hole, a 35 positioning rod, a 36 arc-shaped limiting block, a 37 elastic piece III, a 38 elastic rope, a 39 driving rod, a 4 storage bin, a 41 anti-.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: an agricultural seeding device comprises a device main body 1, the front side and the rear side of the device main body 1 are penetrated by a rotating shaft 2 and are rotationally connected with the rotating shaft 2, both ends of the rotating shaft 2 are fixedly provided with idler wheels 21, the rotating shaft 2 is in transmission connection with a seeding circular plate 3 through a chain, the top of the seeding circular plate 3 is attached to both sides of the bottom of a storage bin 4, the top of the storage bin 4 is communicated with the outside, the bottom of the seeding circular plate 3 is provided with a discharging pipe 5, the bottom end of the discharging pipe 5 is arranged at the bottom of the device main body 1, the device main body 1 is communicated with the outside through the discharging pipe 5, the right side of the discharging pipe 5 is provided with a guide block 6, the guide block 6 is fixed inside the device main body 1, the seeding circular plate 3 is hollowed with an arc-shaped material distributing channel 31, the seeding circular plate 3 is, the seeding circular plate 3 rotates in the moving process of the device main body 1, soybean seeds in the storage bin 4 can be discharged by arranging the arc-shaped material distribution channel 31 in the seeding circular plate 3, so that the soybean seeds can be uniformly discharged, and in the discharging process, the seeds with smaller volume pass through the arc-shaped material distribution channel 31 and are moved out of the seeding circular plate 3 to be finally stored in the device main body 1; seeds with larger volume stay in the arc-shaped material distribution channel 31 and rotate along with the seeding circular plate 3, and are finally discharged from the discharge pipe 5; so as to realize screening out the soybean seeds with smaller volume in the sowing process.

Preferably, in this embodiment, in order to prevent soybean seeds from entering the inside of the arc-shaped material distribution channel 31 from one end of the arc-shaped material distribution channel 31, which is far away from the first guide piece 312 and the second guide piece 313, so as to affect sowing, a blocking piece 311 is arranged at one end of the arc-shaped material distribution channel 31, the first guide piece 312 and the second guide piece 313 are respectively installed at two sides of the inside of the other end of the arc-shaped material distribution channel 31, the blocking piece 311 includes a rotating blocking piece a1 and a tapered limiting block a2, one end of the rotating blocking piece a1 is rotatably installed inside the arc-shaped material distribution channel 31, a balancing weight a3 is fixedly installed at the other end of the rotating blocking piece a1, the tapered.

Preferably, in this embodiment, in order to prevent soybean seeds with a smaller volume inside the arc-shaped material distribution channel 31 from flowing back, a plurality of arc-shaped grooves 314 are hollowed inside the arc-shaped material distribution channel 31, an anti-backflow block 315 is rotatably installed inside the arc-shaped grooves 314, and one side of the anti-backflow block 315 is connected with the inner wall of the arc-shaped grooves 314 through a spring.

Preferably, in this embodiment, in order to prevent the soybean seeds at the bottom of the storage bin 4 from being blocked, two sides of one end of the arc-shaped material distribution channel 31, which is far away from the blocking member 311, are provided with a first cavity 32, the first cavity 32 is opened inside the seeding circular plate 3, the parts of the seeding circular plate 3, which are located at two sides of the first cavity 32, are respectively fixed with two ends of a first spring piece 321, the distance between the centers of the first spring pieces 321 is equal to the inner diameter of the bottom of the storage bin 4, the first spring piece 321 protrudes out of the first cavity 32, the center of the concave side of the first spring piece 321 is fixed with one end of a second spring piece 322, the other end of the second spring piece 322 is fixed inside the first cavity 32, the center of the convex side of the second spring piece 322 is fixed with one end of a sliding rod 323, the other end of the sliding rod is slidably, the top of the anti-blocking plate 41 is connected with the inner wall of the storage bin 4 through a spring.

Preferably, in this embodiment, the first guide vane 312 is fixedly installed inside the arc-shaped material distribution channel 31, one end of the second guide vane 313 is rotatably installed inside the arc-shaped material distribution channel 31, the other end of the second guide vane is fixedly installed with the first spherical plug 331, the first spherical plug 331 is movably connected with one end of the second cavity 33, the other end of the second cavity 33 is movably connected with the second spherical plug 332, the second cavity 33 is arranged on one side of the second guide vane 313 away from the first guide vane 312, one end of the second spherical plug 332 is fixedly installed with the arc-shaped positioning plate 34, one end of the arc-shaped positioning plate 34 away from the second spherical plug 332 is protrudingly provided with the first bump 1 and the second bump 2, a through hole c3 is formed in a portion of the arc-shaped positioning plate 34 located between the first bump c1 and the second bump c2, one side of the through hole c3 is attached to the first.

Preferably, in this embodiment, in order to prevent the device body 1 from sowing when there is no soybean seed in the arc-shaped material distribution channel 31, a portion of the arc-shaped positioning plate 34 located between the through hole c3 and the second bump 2 is attached to one end of the positioning rod 35, the other end of the positioning rod 35 is fixed to the concave side of the arc-shaped limiting block 36, the diameter of the positioning rod 35 is smaller than the aperture of the through hole c3, the arc-shaped limiting block 36 is rotatably installed on the sowing circular plate 3, the convex side of the arc-shaped limiting block 36 is serrated, the concave side is connected with the sowing circular plate 3 through the third spring piece 37, the center of the convex side of the third spring piece 37 is fixed to one end of the elastic rope 38, the other end of the elastic rope 38 is fixed to the transmission rod 39, one end of the transmission rod 39 is.

The working principle is as follows: arrange soybean seed in storage silo 4 inside, thrust unit main part 1 removes, gyro wheel 21 and the equal anticlockwise rotation of pivot 2, seeding plectane 3 also can anticlockwise rotation under the effect of pivot 2, when the arc divides material passageway 31 to keep away from the one end that stops piece 311 and rotates to storage silo 4 bottom, soybean seed in the storage silo 4 enters into arc and divides material passageway 31, the less seed of volume passes arc and divides material passageway 31 and store inside device main part 1 through guide block 6, the great plump seed of volume can stop between guide vane a 312 and guide vane two 313, seeding plectane 3 continues to rotate the in-process, when the arc divides material passageway 31 to keep away from the one end that stops piece 311 and rotates to discharging pipe 5 top, the great plump seed of volume can pass discharging pipe 5 and sow.

When the seeds with small volume pass through the blocking piece 311, the seeds can push the rotating blocking piece a1 to rotate, so the discharging of the seeds can not be influenced by the rotating blocking piece a1, when the rotating blocking piece a1 rotates to be contacted with the bottom of the storage bin 4, the storage bin 4 can push the rotating blocking piece a1 to reset to be contacted with the conical limiting block a2, at the moment, the seeds can be blocked by the rotating blocking piece a1 when entering the arc-shaped material distribution channel 31 from the end, and the seeds can not enter the arc-shaped material distribution channel 31.

When the seeds with small volume move in the arc-shaped material distribution channel 31 for discharging, the seeds can push the backflow prevention block 315 to rotate, and when the seeds flow back, the backflow prevention block 315 can block the seeds so as to prevent the seeds from flowing back to the maximum extent.

Seeding plectane 3 rotates the in-process, a shell fragment 321 on the cavity 32 can be extruded by 4 bottoms of storage silo, a shell fragment 321 can be extruded two shell fragments 322 by the extrusion in-process, two shell fragments 322 can promote slide bar 323 by the extrusion in-process and remove, slide bar 323 removes the in-process and can promote bar ejector pad 325 and rotate, bar ejector pad 325 rotates the in-process and can promote anti-clogging plate 41 and rotate, anti-clogging plate 41 can promote the mediation to the soybean seed of 4 bottoms of storage silo, in order to prevent that the soybean seed of 4 bottoms of storage silo from blockking up.

When there are no full soybean seeds with large volume between the first guide piece 312 and the second guide piece 313, the position of the arc-shaped limiting block 36 is fixed by the arc-shaped positioning plate 34, the arc-shaped limiting plate 34 will contact with the bottom of the storage bin 4 during the rotation of the sowing circular plate 3, so that the sowing circular plate 3 cannot rotate, when there are full soybean seeds with large volume between the first guide piece 312 and the second guide piece 313, the soybean seeds will push the second guide piece 313 to rotate, the second guide piece 313 pushes the first spherical plug 331 to move, the first spherical plug 331 pushes the second spherical plug 332 to move through the air pressure in the second cavity 33, the second spherical plug 332 pushes the arc-shaped positioning plate 34 to move until the through hole c3 on the arc-shaped positioning plate 34 moves to the bottom of the positioning rod 35, and because the first elastic piece 321 and the second elastic piece 322 are pressed by the storage bin 4 at this time, the transmission rod 39 pulls the elastic piece 38 to deform, so that the third elastic piece 37 is pulled by the storage bin, the third spring piece 37 drives the arc-shaped limiting block 36 to rotate, the positioning rod 35 penetrates through the through hole c3, and at the moment, the arc-shaped limiting block 36 is separated from the bottom of the storage bin 4, so that the seeding circular plate 3 can rotate to achieve the effect of preventing the device from leaking seeds.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An agricultural seeding device, comprising a device main body (1), characterized in that: the device is characterized in that the front side and the rear side of the device main body (1) are penetrated through by a rotating shaft (2) and are rotationally connected with the rotating shaft (2), rollers (21) are fixedly mounted at the two ends of the rotating shaft (2), the rotating shaft (2) is in transmission connection with a seeding circular plate (3) through a chain, the top of the seeding circular plate (3) is attached to the two sides of the bottom of a storage bin (4), the top of the storage bin (4) is communicated with the outside, a discharging pipe (5) is arranged at the bottom of the seeding circular plate (3), the bottom of the discharging pipe (5) is arranged at the bottom of the device main body (1), the device main body (1) is communicated with the outside through the discharging pipe (5), a guide block (6) is arranged on the right side of the discharging pipe (5), the guide block (6) is fixed inside the device main body (1), an arc-shaped material distribution channel (31) is arranged inside the seeding circular plate (3, the number of the arc-shaped material distribution channels (31) is two, and the two arc-shaped material distribution channels (31) are symmetrically arranged inside the sowing circular plate (3).

2. An agricultural seed planting device as defined in claim 1, wherein: arc divides material passageway (31) one end to be provided with stops (311), and guide vane (312) and guide vane two (313) are installed respectively to the inside both sides of the other end, stop (311) including rotating block (a1) and toper stopper (a2), rotate block (a1) one end and rotate and install inside arc divides material passageway (31), and other end fixed mounting has balancing weight (a3), toper stopper (a2) fixed mounting is inside arc divides material passageway (31), toper stopper (a2) endpoint department blocks piece (a1) laminating with rotating.

3. An agricultural seed planting device as defined in claim 1, wherein: the arc divides material passageway (31) inside to be drawn in and to have a plurality of arc walls (314), arc wall (314) inside rotation installs prevents reflux block (315), prevent reflux block (315) one side through spring and arc wall (314) inner wall connection.

4. An agricultural seed planting device as defined in claim 1, wherein: the two sides of one end, far away from the blocking piece (311), of the arc-shaped material distribution channel (31) are provided with a first cavity (32), the first cavity (32) is arranged inside the seeding circular plate (3), the parts, located on the two sides of the first cavity (32), of the seeding circular plate (3) are fixed to the two ends of a first elastic sheet (321) respectively, the first elastic sheet (321) protrudes outside the first cavity (32), the center of the sunken side of the first elastic sheet (321) is fixed to one end of a second elastic sheet (322), the other end of the second elastic sheet (322) is fixed inside the first cavity (32), the center of the protruded side of the second elastic sheet (322) is fixed to one end of a sliding rod (323), the other end of the sliding rod (323) is connected with the side face of a rotating rod (324) in a sliding manner, one end of the rotating rod (324) is rotatably arranged inside the first cavity (32), the other end of the rotating rod is welded with, the top of the anti-blocking plate (41) is connected with the inner wall of the storage bin (4) through a spring.

5. An agricultural seed planting device as defined in claim 2, wherein: the guide vane I (312) is fixedly installed inside the arc-shaped material distribution channel (31), one end of the guide vane II (313) is rotatably installed inside the arc-shaped material distribution channel (31), the other end of the guide vane I (331) is fixedly installed at the other end of the guide vane II (313), the spherical plug I (331) is movably connected with one end of the cavity II (33), the other end of the cavity II (33) is movably connected with the spherical plug II (332), the cavity II (33) is arranged at one side, away from the guide vane I (312), of the guide vane II (313), one end of the spherical plug II (332) is fixedly installed with the arc-shaped positioning plate (34), one end, away from the spherical plug II (332), of the arc-shaped positioning plate (34) is convexly provided with a convex block I (c1) and a convex block II (c2), a through hole (c3) is arranged at the part, between the convex block I (c1) and the convex block II (c2), one side of the through hole (c 46, the other side is positioned at a distance equal to the aperture of the through hole (c3) from the second bump (c 2).

6. An agricultural seed planting device as defined in claim 5, wherein: the part of the arc-shaped positioning plate (34) between the through hole (c3) and the second bump (c2) is attached to one end of the positioning rod (35), the other end of the positioning rod (35) is fixed on the concave side of the arc-shaped limiting block (36), the diameter of the positioning rod (35) is smaller than the aperture of the through hole (c3), the arc-shaped limiting block (36) is rotatably arranged on the seeding circular plate (3), the convex side of the arc-shaped limiting block (36) is in a sawtooth shape, the concave side is connected with the seeding circular plate (3) through a third elastic sheet (37), the center of the convex side of the third elastic sheet (37) is fixed with one end of an elastic rope (38), the other end of the elastic rope (38) is fixed with the transmission rod (39), one end of the transmission rod (39) is connected with the inner wall of the first cavity (32) in a sliding mode, and the other end of the transmission rod is fixed with the concave side of the second elastic sheet (322) in the first cavity (32) close to the second guide sheet (313).