Uniform seeding machine

Abstract

The utility model provides a uniform seeding machine, belongs to the technical field of agricultural machinery, and aims to solve the problems that in the using process of an existing uniform seeding machine, as the distance between seeding pipes is fixed, when crop seeds need to be seeded at different distances, the seeding pipes are usually required to be detached, and the seeding cost is high. In order to solve the problems that in the prior art, sowing is carried out after sowing pipes are sequentially installed at proper positions, operation is tedious, and the sowing efficiency is affected, two sets of sliding grooves are arranged, and the two sets of sliding grooves are both formed in the inner side of the lower end of a machine body; the push rod is fixedly connected to the rear end of the machine body; the top plate is fixedly connected to the upper end of the machine body; the seeding shaft is rotationally connected to the upper end surface of the machine body; the number of the seeding shells is three, the middle seeding shell is fixedly connected to the upper end of the machine body, and the seeding shells on the two sides are slidably connected to the upper end of the machine body; through the arrangement of the seeding device, the seeding spacing can be adjusted, the working efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural machinery, and more specifically, particularly relates to a uniform seeding machine. Background Art

[0002] A seeder is a device used to sow crop seeds, and a uniform seeder can sow crop seeds evenly into the soil at a certain interval. During the use of the uniform seeder, the crop seeds are usually placed in the seeder, and the crop seeds are evenly spread out through the movement of the seeder.

[0003] According to the application number: CN201721104201.1, a seeder with uniform sowing is disclosed, including a shell, a fixed frame, wheels, a motor, a seeding box, a push rod and a battery; the lower surface of the shell is fixedly connected with a fixed frame, the side walls of the fixed frame are rotatably connected with the front axle and the rear axle respectively, the side walls of the fixed frame are fixedly connected with the motor, a punching pile is arranged on the left side of the front axle, a half gear is sleeved on the middle part of the front axle, a rack is fixedly connected to the right side wall of the punching pile, the rack is meshed with the half gear, a transmission shaft is arranged above the rear axle, and a seeding box is fixedly connected to the inside of the shell. In the process of the device moving forward, the punching pile can be used to evenly punch sowing pits on the ground, and the turntable is used to make seeds fall into the sowing pits intermittently, so as to maintain a certain sowing density, which is conducive to the growth of crops; in the sowing process, the shovel is used to push the soil into the sowing pit to bury the seeds, the water pump is started, and the liquid fertilizer is sprayed, and the sowing, burying and fertilizing are carried out simultaneously.

[0004] Based on the above, during the use of the existing uniform seeder, since the spacing between the sowing tubes is fixed, when crop seeds need to be sown at different spacings, it is usually necessary to disassemble the sowing tubes and then install them in the appropriate positions in turn before sowing. The operation is cumbersome and affects the sowing efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a uniform seeder to solve the problem that in the use of the existing uniform seeder, due to the fixed spacing between the sowing tubes, when it is necessary to sow crop seeds at different spacings, it is usually necessary to disassemble the sowing tubes and install them in appropriate positions in turn before sowing, which is cumbersome to operate and affects the sowing efficiency.

[0006] The purpose and effect of the uniform seeding machine of the utility model are achieved by the following specific technical means:

[0007] A uniform seed drill comprises a machine body, a slide, a push rod, a top plate, a seeding shaft, a seeding shell, a seeding bucket, a driving pulley, a second pulley, a second connecting belt, a third pulley, a seeding pulley, a third connecting belt, a first connecting shaft, a second connecting shaft, an adjustment mechanism and an anti-reverse mechanism; the slide is provided with two groups, and the two groups of slides are both opened on the inner side of the lower end of the machine body; the push rod is fixedly connected to the rear end of the machine body; the top plate is fixedly connected to the upper end of the machine body; the seeding shaft is rotatably connected to the upper end surface of the machine body; the seeding shell is provided with three, the middle seeding shell is fixedly connected to the upper end of the machine body, and the seeding shells on both sides are slidably connected to the upper end of the machine body; the seeding bucket is provided with three, and the three seeding buckets are respectively fixedly connected to the three seeding At the upper end of the shell, the middle sowing bucket is fixedly connected to the upper end surface of the top plate, and the sowing buckets on both sides are slidably connected to the upper end surface of the top plate; two driving pulleys are provided, and both driving pulleys rotate on the upper end of the machine body; the second pulley is rotatably connected to the upper end of the machine body; the second connecting belt is covered on the outer side of the driving pulley and the second pulley; the third pulley is rotatably connected to the upper end of the machine body; the sowing pulley is fixedly connected to the outer side of the sowing shaft; the first connecting shaft is fixedly connected to the inner side of the second pulley; the second connecting shaft is fixedly connected to the inner side of the third pulley, and the second connecting shaft is rotatably connected to the first connecting shaft; the adjusting mechanism is arranged at the upper end of the machine body; the anti-reverse mechanism is arranged on the inner side of the second connecting shaft.

[0008] Furthermore, the adjustment mechanism includes: a slotted member, a backfill member, a connecting rod, a rotating shaft, a traveling wheel, a first pulley, a first connecting belt, a screw slider and a bidirectional screw; the slotted members are provided with three, the middle slotted member is fixedly mounted at the lower end of the machine body, and the slotted members on both sides are slidably connected to the inner side of the slide groove; the backfill members are provided with three, the middle backfill member is fixedly mounted at the lower end of the machine body, and the backfill members on both sides are slidably connected to the inner side of the slide groove; the connecting rod is provided with two groups, one end of the two groups of connecting rods is respectively fixedly connected to the upper ends of the slotted members and the backfill members on both sides, and the other ends of the two groups of connecting rods are respectively fixedly connected to The outside of the sowing shells on both sides; the rotating shaft is rotatably connected to the inside of the machine body; the traveling wheel is fixedly connected to the outside of the rotating shaft; the first pulley is fixedly connected to the outside of the rotating shaft; the first connecting belt is covered on the outside of the driving pulley and the first pulley; the third connecting belt is covered on the outside of the third pulley and the sowing pulley; the screw sliders are provided with two groups, and the two groups of screw sliders are respectively fixedly connected to the outside of the sowing shells on both sides; the bidirectional screws are provided with two, and the two bidirectional screws are both rotatably connected to the inside of the machine body, and the two bidirectional screws are respectively threadedly connected to the inside of the two groups of screw sliders.

[0009] Furthermore, the adjustment mechanism also includes: a fixed slide rod, a seeding wheel, a seeding groove and a guide groove; the fixed slide rod is fixedly connected to the outer side of the seeding shaft; there are three seeding wheels, which are respectively rotatably connected to the inner sides of three seeding shells, and the seeding wheels on both sides are respectively slidably connected to the outer side of the seeding shaft; there are three groups of seeding grooves, which are respectively opened on the outer sides of the three seeding wheels; there are two guide grooves, which are respectively opened on the inner sides of the seeding wheels on both sides, and the seeding grooves are slidably connected to the fixed slide rod.

[0010] Furthermore, the adjustment mechanism also includes: a connecting pulley and a synchronous belt; two connecting pulleys are provided, and the two connecting pulleys are respectively fixedly connected to the outer sides of the two bidirectional screws; the synchronous belt is wrapped around the outer sides of the two connecting pulleys.

[0011] Furthermore, the adjustment mechanism also includes: a worm wheel, a worm and a handle; the worm wheel is fixedly connected to the outside of the bidirectional screw; the worm is rotatably connected to the outside of the body, and the worm is meshed with the worm wheel; the handle is fixedly connected to the outside of the worm.

[0012] Furthermore, the anti-rebound mechanism includes: a limit groove, a limit slider and a compression spring; there are multiple limit grooves, and the multiple limit grooves are all opened on the inner side of the second connecting shaft; there are two limit sliders, and the two limit sliders are both slidably connected to the inner side of the first connecting shaft, and the limit slider is inserted into the inner side of the limit groove; there are two compression springs, one end of the two compression springs is respectively fixedly connected to the outer sides of the two limit sliders, and the other ends of the two compression springs are fixedly connected to the inner side of the first connecting shaft.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model realizes the adjustment of the sowing spacing through the setting of the adjustment mechanism. The handle is rotated, and the handle drives the two-way lead screw to rotate through the meshing of the worm and the worm wheel. Through the setting of the connecting pulley and the synchronous belt, the two two-way lead screws rotate at the same time. The rotation of the two-way lead screw drives the sowing shells on both sides to slide in opposite directions under the action of the lead screw slider, so as to adjust the spacing between the sowing shells. The sliding of the sowing shells can simultaneously make the sowing wheel, the slotted part and the backfilling part slide, so as to adapt to sowing with different spacings, and the operation is convenient, the work efficiency is improved, and the labor intensity is reduced; through the setting of the anti-reverse mechanism, the sowing is stopped when the seeder moves backward, when the seeder moves backward, the first connecting shaft is reversed, and through the setting of the limiting groove and the limiting slider, the reversal of the first connecting shaft cannot drive the second connecting shaft to rotate, so the sowing is stopped at this time, the waste of crop seeds is reduced, and the economic loss is reduced; through the setting of the above-mentioned mechanism, the sowing spacing is adjusted, the work efficiency is improved, the labor intensity is reduced, and the sowing is stopped when the seeder moves backward, the waste of crop seeds is reduced, and the economic loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the main body of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the connecting pulley of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the second connecting shaft of the utility model.

[0018] Figure 4 It is a structural schematic diagram of the fixed sliding rod of the utility model.

[0019] Figure 5 It is a structural schematic diagram of a bidirectional lead screw of the utility model.

[0020] Figure 6 This utility model Figure 5 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0021] Figure 7 It is a structural schematic diagram of a limit sliding block of the utility model.

[0022] Figure 8 It is a structural schematic diagram of the first connecting shaft section of the utility model.

[0023] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0024] 1. Machine body; 101. Slide groove; 2. Push rod; 3. Top plate; 4. Seeding shaft; 401. Fixed slide rod; 5. Seeding shell; 6. Seeding bucket; 7. Slotted part; 8. Backfill part; 9. Connecting rod; 10. Driving pulley; 11. Rotating shaft; 12. Traveling wheel; 13. First pulley; 14. First connecting belt; 15. Second pulley; 16. Second connecting belt; 17. Third pulley; 18. Seeding pulley; 19. Third connecting belt; 20. First connecting shaft; 21. Second connecting shaft; 2101. Limiting groove; 22. Lead screw slider; 23. Bidirectional lead screw; 24. Seeding wheel; 2401. Seeding groove; 2402. Guide groove; 25. Connecting pulley; 26. Synchronous belt; 27. Worm wheel; 28. Worm; 29. ​​Handle; 30. Limiting slider; 31. Compression spring. DETAILED DESCRIPTION

[0025] The implementation of the utility model is further described in detail below in conjunction with the drawings and examples.

[0026] Embodiment 1:

[0027] As attached Figure 1-Figure 6 As shown:

[0028] The utility model provides a uniform seeding machine, including a machine body 1, a chute 101, a push rod 2, a top plate 3, a seeding shaft 4, a seeding shell 5, a seeding bucket 6, a driving pulley 10, a second pulley 15, a second connecting belt 16, a third pulley 17, a seeding pulley 18, a third connecting belt 19, a first connecting shaft 20, a second connecting shaft 21 and an adjusting mechanism; the chute 101 is provided with two groups, and the two groups of chute 101 are both opened on the inner side of the lower end of the machine body 1; the push rod 2 is fixedly connected to the rear end of the machine body 1; the top plate 3 is fixedly connected to the upper end of the machine body 1; the seeding shaft 4 is rotatably connected to the upper end surface of the machine body 1; there are three seeding shells 5, the middle seeding shell 5 is fixedly connected to the upper end of the machine body 1, and the seeding shells 5 on both sides are slidably connected to the upper end of the machine body 1; the seeding bucket 6 is provided with three, three The seeding buckets 6 are respectively fixedly connected to the upper ends of the three seeding shells 5, the middle seeding bucket 6 is fixedly connected to the upper end surface of the top plate 3, and the seeding buckets 6 on both sides are slidably connected to the upper end surface of the top plate 3; there are two driving pulleys 10, and the two driving pulleys 10 are rotated at the upper end of the machine body 1; the second pulley 15 is rotatably connected to the upper end of the machine body 1; the second connecting belt 16 is covered on the outer side of the driving pulley 10 and the second pulley 15; the third pulley 17 is rotatably connected to the upper end of the machine body 1; the seeding pulley 18 is fixedly connected to the outer side of the seeding shaft 4; the first connecting shaft 20 is fixedly connected to the inner side of the second pulley 15; the second connecting shaft 21 is fixedly connected to the inner side of the third pulley 17, and the second connecting shaft 21 is rotatably connected to the first connecting shaft 20; the adjusting mechanism is arranged at the upper end of the machine body 1.

[0029] The adjusting mechanism includes: a fixed slide bar 401, a slotted member 7, a backfilling member 8, a connecting rod 9, a rotating shaft 11, a traveling wheel 12, a first pulley 13, a first connecting belt 14, a lead screw slider 22, a bidirectional lead screw 23, a seeding wheel 24, a seeding groove 2401, a guide groove 2402, a connecting pulley 25, a synchronous belt 26, a worm wheel 27, a worm 28 and a handle 29; the fixed slide bar 401 is fixedly connected to the outer side of the seeding shaft 4; there are three slotted members 7, the middle slotted member 7 is fixedly installed at the lower end of the machine body 1, and the slotted members 7 on both sides are slidably connected to the inner side of the slide groove 101; the backfilling member 8 There are three, the middle backfilling piece 8 is fixedly installed at the lower end of the machine body 1, and the backfilling pieces 8 on both sides are slidably connected to the inner side of the slide groove 101; there are two groups of connecting rods 9, one end of the two groups of connecting rods 9 is respectively fixedly connected to the upper ends of the slotted pieces 7 and the backfilling pieces 8 on both sides, and the other ends of the two groups of connecting rods 9 are respectively fixedly connected to the outer sides of the sowing shells 5 on both sides; the rotating shaft 11 is rotatably connected to the inner side of the machine body 1; the traveling wheel 12 is fixedly connected to the outer side of the rotating shaft 11; the first pulley 13 is fixedly connected to the outer side of the rotating shaft 11; the first connecting belt 14 is covered on the outer side of the driving pulley 10 and the first pulley 13; the third connecting rod 9 is provided with a plurality of connecting rods 9, and the connecting rods 9 are provided with a plurality of connecting rods 9. The connecting belt 19 is covered on the outer side of the third pulley 17 and the sowing pulley 18; there are two groups of screw sliders 22, and the two groups of screw sliders 22 are respectively fixedly connected to the outer sides of the sowing shells 5 on both sides; there are two bidirectional screws 23, and the two bidirectional screws 23 are rotatably connected to the inner side of the body 1, and the two bidirectional screws 23 are respectively threadedly connected to the inner sides of the two groups of screw sliders 22; there are three sowing wheels 24, and the three sowing wheels 24 are respectively rotatably connected to the inner sides of the three sowing shells 5, and the sowing wheels 24 on both sides are respectively slidably connected to the outer sides of the sowing shaft 4; there are three groups of sowing grooves 2401, and the three groups of sowing grooves 24 01 are respectively opened on the outside of the three seeding wheels 24; there are two guide grooves 2402, and the two guide grooves 2402 are respectively opened on the inner sides of the seeding wheels 24 on both sides, and the seeding groove 2401 is slidably connected with the fixed slide rod 401; there are two connecting pulleys 25, and the two connecting pulleys 25 are respectively fixedly connected to the outside of the two bidirectional lead screws 23; the synchronous belt 26 is covered on the outside of the two connecting pulleys 25; the worm wheel 27 is fixedly connected to the outside of the bidirectional lead screw 23; the worm 28 is rotatably connected to the outside of the body 1, and the worm 28 is meshed with the worm wheel 27; the handle 29 is fixedly connected to the outside of the worm 28.

[0030] The specific usage and function of this embodiment are as follows: by rotating the handle 29, the handle 29 will drive the bidirectional lead screw 23 to rotate through the meshing of the worm 28 and the worm wheel 27, and by connecting the pulley 25 and the synchronous belt 26, the two bidirectional lead screws 23 will rotate at the same time. The rotation of the bidirectional lead screw 23 will drive the sowing shells 5 on both sides to slide in opposite directions under the action of the lead screw slider 22, thereby adjusting the spacing between the sowing shells 5. The sliding of the sowing shells 5 will simultaneously cause the sowing wheel 24, the slotted member 7 and the backfill member 8 to slide, thereby adapting to sowing at different spacings.

[0031] Embodiment 2:

[0032] On the basis of the first embodiment, Figure 7-Figure 8 As shown, the anti-rebound mechanism includes: a limit groove 2101, a limit slider 30 and a compression spring 31; the anti-rebound mechanism is arranged on the inner side of the second connecting shaft 21; there are multiple limit grooves 2101, and the multiple limit grooves 2101 are all opened on the inner side of the second connecting shaft 21; there are two limit sliders 30, and the two limit sliders 30 are both slidably connected to the inner side of the first connecting shaft 20, and the limit slider 30 is inserted into the inner side of the limit groove 2101; there are two compression springs 31, one end of the two compression springs 31 is respectively fixedly connected to the outer sides of the two limit sliders 30, and the other ends of the two compression springs 31 are both fixedly connected to the inner side of the first connecting shaft 20.

[0033] The specific usage and function of this embodiment are as follows: when the seeder moves forward, the first connecting shaft 20 rotates forward. At this time, the first connecting shaft 20 will drive the second connecting shaft 21 to rotate under the action of the limiting groove 2101 and the limiting slider 30, so that the second connecting shaft 21 drives the sowing shaft 4 and the sowing wheel 24 to rotate through the third pulley 17, the sowing pulley 18 and the third connecting belt 19 to sow. When the seeder moves backward, the first connecting shaft 20 reverses. Due to the setting of the limiting groove 2101 and the limiting slider 30, the reversal of the first connecting shaft 20 cannot drive the second connecting shaft 21 to rotate, and sowing will be stopped at this time.

[0034] In this article, there are a few points to note:

[0035] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0036] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0037] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A uniform seed drill, characterized in that: The invention comprises a machine body (1), a slide groove (101), a push rod (2), a top plate (3), a sowing shaft (4), a sowing shell (5), a sowing bucket (6), a driving pulley (10), a second pulley (15), a second connecting belt (16), a third pulley (17), a sowing pulley (18), a third connecting belt (19), a first connecting shaft (20), a second connecting shaft (21), an adjustment mechanism and an anti-reverse mechanism; the slide groove (101) is provided with two groups, and the two groups of slide grooves (101) are both opened at The push rod (2) is fixedly connected to the rear end of the machine body (1); the top plate (3) is fixedly connected to the upper end of the machine body (1); the sowing shaft (4) is rotatably connected to the upper end surface of the machine body (1); three sowing shells (5) are provided, the middle sowing shell (5) is fixedly connected to the upper end of the machine body (1), and the sowing shells (5) on both sides are slidably connected to the upper end of the machine body (1); three sowing buckets (6) are provided, and the three sowing buckets (6) are respectively fixedly connected to the upper end surface of the machine body (1); At the upper ends of the three sowing shells (5), the middle sowing bucket (6) is fixedly connected to the upper end surface of the top plate (3), and the sowing buckets (6) on both sides are slidably connected to the upper end surface of the top plate (3); two driving pulleys (10) are provided, and the two driving pulleys (10) are both rotatable on the upper end of the machine body (1); the second pulley (15) is rotatably connected to the upper end of the machine body (1); the second connecting belt (16) is wrapped around the outer sides of the driving pulley (10) and the second pulley (15); the third belt The wheel (17) is rotatably connected to the upper end of the machine body (1); the sowing pulley (18) is fixedly connected to the outer side of the sowing shaft (4); the first connecting shaft (20) is fixedly connected to the inner side of the second pulley (15); the second connecting shaft (21) is fixedly connected to the inner side of the third pulley (17), and the second connecting shaft (21) is rotatably connected to the first connecting shaft (20); the adjusting mechanism is arranged at the upper end of the machine body (1); and the anti-reverse mechanism is arranged on the inner side of the second connecting shaft (21).

2. A uniform seed drill as claimed in claim 1, characterized in that: The adjusting mechanism comprises: a slotting member (7), a backfilling member (8), a connecting rod (9), a rotating shaft (11), a traveling wheel (12), a first pulley (13), a first connecting belt (14), a screw slider (22) and a bidirectional screw (23); the slotting members (7) are provided in three pieces, the middle slotting member (7) is fixedly mounted on the lower end of the machine body (1), and the slotting members (7) on both sides are slidably connected to the inner side of the slide groove (101); the backfilling members (8) are provided in three pieces, the middle backfilling member (8) is fixedly mounted on the lower end of the machine body (1), and the backfilling members (8) on both sides are slidably connected to the inner side of the slide groove (101); the connecting rod (9) is provided in two groups, one end of the two groups of connecting rods (9) is respectively fixedly connected to the upper ends of the slotting members (7) and the backfilling members (8) on both sides, and the other ends of the two groups of connecting rods (9) are respectively fixedly connected to the sowing members (101) on both sides. The outer side of the shell (5); characterized in that: the rotating shaft (11) is rotatably connected to the inner side of the machine body (1); the traveling wheel (12) is fixedly connected to the outer side of the rotating shaft (11); the first pulley (13) is fixedly connected to the outer side of the rotating shaft (11); the first connecting belt (14) is covered on the outer sides of the driving pulley (10) and the first pulley (13); the third connecting belt (19) is covered on the outer sides of the third pulley (17) and the sowing pulley (18); the screw slider (22) is provided with two groups, and the two groups of screw sliders (22) are respectively fixedly connected to the outer sides of the sowing shells (5) on both sides; the bidirectional screws (23) are provided with two, the two bidirectional screws (23) are both rotatably connected to the inner side of the machine body (1), and the two bidirectional screws (23) are respectively threadedly connected to the inner sides of the two groups of screw sliders (22).

3. A uniform seed drill as claimed in claim 2, characterized in that: The adjustment mechanism further comprises: a fixed slide bar (401), a seeding wheel (24), a seeding groove (2401) and a guide groove (2402); the fixed slide bar (401) is fixedly connected to the outside of the seeding shaft (4); three seeding wheels (24) are provided, the three seeding wheels (24) are respectively rotatably connected to the inside of three seeding shells (5), and the seeding wheels (24) on both sides are respectively slidably connected to the outside of the seeding shaft (4); three groups of seeding grooves (2401) are provided, and the three groups of seeding grooves (2401) are respectively opened on the outside of the three seeding wheels (24); two guide grooves (2402) are provided, and the two guide grooves (2402) are respectively opened on the inside of the seeding wheels (24) on both sides, and the seeding grooves (2401) are slidably connected to the fixed slide bar (401).

4. A uniform seed drill as claimed in claim 3, characterized in that: The adjustment mechanism further comprises: a connecting pulley (25) and a synchronous belt (26); two connecting pulleys (25) are provided, and the two connecting pulleys (25) are respectively fixedly connected to the outsides of the two bidirectional lead screws (23); and the synchronous belt (26) is wrapped around the outsides of the two connecting pulleys (25).

5. A uniform seed drill as claimed in claim 4, characterized in that: The adjustment mechanism further comprises: a worm wheel (27), a worm (28) and a handle (29); the worm wheel (27) is fixedly connected to the outside of the bidirectional lead screw (23); the worm (28) is rotatably connected to the outside of the machine body (1), and the worm (28) is meshed with the worm wheel (27); and the handle (29) is fixedly connected to the outside of the worm (28).

6. A uniform seed drill as claimed in claim 1, characterized in that: The anti-reverse mechanism comprises: a limit groove (2101), a limit slider (30) and a compression spring (31); a plurality of limit grooves (2101) are provided, and the plurality of limit grooves (2101) are all arranged on the inner side of the second connecting shaft (21); two limit sliders (30) are provided, and the two limit sliders (30) are both slidably connected to the inner side of the first connecting shaft (20), and the limit sliders (30) are inserted into the inner side of the limit groove (2101); two compression springs (31) are provided, and one end of the two compression springs (31) is respectively fixedly connected to the outer sides of the two limit sliders (30), and the other ends of the two compression springs (31) are both fixedly connected to the inner side of the first connecting shaft (20).

Images