Dividing device of automatic conveyor

Abstract

The utility model relates to the technical field of packaging equipment, in particular to a separation device of an automatic conveyor, which comprises a mounting frame, a cylinder, a steering shaft and a conveying mechanism, one end of the conveying mechanism is hinged on the mounting frame, the top end of the conveying mechanism is connected with a bearing at the output end of the cylinder, and the top end of the cylinder is rotatably connected with the mounting frame. A plurality of second conveying mechanisms are longitudinally mounted on the mounting frame, the other ends of the conveying mechanisms face the input ends of the second conveying mechanisms, the second conveying mechanisms and the conveying mechanisms are of the same structure, and products are conveyed into the second conveying mechanisms by arranging the ends of the conveying mechanisms to be hinged to the mounting frame and enabling an air cylinder to move upwards or downwards. And the space occupied by the separation device is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging equipment, in particular to a lane dividing device of an automatic conveyor. Background Art

[0002] The lane divider is an important part of the conveyor, mainly used to evenly distribute multiple materials to their respective conveyor belts or tracks to ensure that the materials can enter the conveyor smoothly and accurately. The performance of the lane divider directly affects the working efficiency and operating stability of the conveyor.

[0003] However, the prior art still has shortcomings. For example, the patent number is: CN201921934892.7, which is a lane dividing device, including a lane dividing mechanism, a servo motor, a conveying channel, an active same-speed gear, a driven same-speed gear, a transmission belt, the lane dividing mechanism and the conveying channel share a fixed plate, the servo motor is connected to the driving shaft through a fixed bearing, the active same-speed gear and the driven same-speed gear are installed on the driving shaft, the transmission belt and the driven same-speed gear are chain driven, the lane dividing mechanism is also provided with a peripheral detection device, the peripheral detection device is installed under the first lane, the lane dividing mechanism is provided with a lane dividing baffle, and sliders are provided at both ends of the lane dividing baffle, the slider is integrated with the lane dividing baffle, and the slider is connected to the transmission belt. When the device is used to classify and collect products, the lane dividing mechanism occupies a large space at the work site. Utility Model Content

[0004] The purpose of the utility model is to provide a lane dividing device for an automatic conveyor to solve the problem raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a lane dividing device for an automatic conveyor, comprising: a mounting frame, a cylinder, a steering shaft and a conveying mechanism, wherein one end of the conveying mechanism is hinged on the mounting frame, the top end of the conveying mechanism is plugged into and matched with the bearing of the cylinder output end, the top end of the cylinder is rotatably connected to the mounting frame, a plurality of second conveying mechanisms are longitudinally mounted on the mounting frame, the other end of the conveying mechanism is arranged toward the input end of the second conveying mechanism, and the second conveying mechanism and the conveying mechanism have the same structure.

[0006] Preferably, the conveying mechanism comprises: a crossbeam and a longitudinal beam, the mounting frame is provided with a second steering shaft, two bearing seats are hinged on the second steering shaft, one end of the crossbeam is provided on the top surface of the bearing seat, and a plurality of longitudinal beams are provided between the two crossbeams.

[0007] Preferably, the conveying mechanism also includes: a U-shaped frame, the bottom surface of the beam is connected to the bottom wall of the U-shaped frame, the top of the U-shaped frame placed on the beam is equipped with a steering shaft, a plurality of arc plates are installed on the steering shaft, the plurality of arc plates form an auxiliary shaft, and the inner wall of the bearing is plugged into the auxiliary shaft.

[0008] Preferably, the conveying mechanism also includes: a motor, a roller and a tensioning assembly, the motor is mounted on the beam, one end of a rotating shaft is mounted on the output end of the motor, the other end of the rotating shaft is rotatably connected to another beam, two rollers are mounted on the rotating shaft, each roller is coupled to a second roller through a belt transmission, the second roller is arranged on the tensioning assembly, and the tensioning assembly is slidably connected to the beam.

[0009] Preferably, a guide beam is mounted on the inner wall of the beam, and the top surface of the guide beam is in sliding friction with the belt.

[0010] Preferably, a heat sink is installed at the bottom end of the guide beam, and the bottom end of the heat sink is connected to the top surface of the longitudinal beam.

[0011] Preferably, the tensioning assembly includes: a mounting block, a guide groove, a tensioning shaft and a positioning screw, the end of the beam away from the motor is provided with a guide groove, the side wall of the beam is provided with a mounting block, the second guide groove on the mounting block is concentrically arranged with the guide groove, and the size area is equal, the second guide groove and the guide groove are both slidably connected to the end of the tensioning shaft, the mounting block is threadedly connected with a positioning screw, the end of the positioning screw is placed in the second guide groove, and is threadedly connected to the screw hole on the side wall of the tensioning shaft.

[0012] Preferably, the side wall of the cross beam is connected to the inner wall of the L-shaped plate, and the top end of the L-shaped plate is arranged toward the belt.

[0013] Preferably, a mounting hole is opened at the end of the steering shaft, a driving member is rotatably connected in the mounting hole, a plurality of guide hole ends are opened on the inner wall of the mounting hole, the other end of the guide hole is opened on the side wall of the steering shaft, a guide plate is slidably connected in the guide hole, the top end of the guide plate is connected to the bottom end of the arc plate, an arc groove is opened on the end face of the guide plate facing the driving member, the arc groove is bent in the direction away from the axis of the steering shaft, and the arc groove is connected to the driving member.

[0014] Preferably, the driving member includes: a driving shaft, a torsion spring, a ratchet ring and a pawl, the mounting hole is rotatably connected to the driving shaft, an annular groove is opened on the inner wall of the mounting hole, the inner wall of the annular groove is connected to the mounting ring through a torsion spring, the mounting ring and the annular groove are rotatably matched, the mounting ring is fixed on the driving shaft, the side wall of the driving shaft outside the steering shaft is equipped with a ratchet ring, the ratchet ring is meshingly connected to the pawl, the pawl is connected to the steering shaft through an unlocking shaft, the second torsion spring end of the pawl side wall is connected to the end of the steering shaft, and a plurality of guide columns are installed at the other end of the driving shaft, and the guide columns are slidably connected to the circular arc groove.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. By setting the end of the conveying mechanism to be hinged with the mounting frame, the cylinder moves upward or downward to convey the product to the second conveying mechanism, saving the space occupied by the lane dividing device;

[0017] 2. The cylinder is used to reduce the movement stroke of the lane separation mechanism, thereby improving the efficiency of the lane separation mechanism at work;

[0018] 3. The steering shaft and conveying mechanism are driven to move through the output end of the cylinder, which improves the accuracy of movement between parts and reduces the difficulty of installation and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the main structure diagram of the utility model;

[0020] Figure 2 This is a crossbeam structure diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the installation position of the motor of the utility model;

[0022] Figure 4 For this utility model Figure 3 A partial enlarged view of the middle A;

[0023] Figure 5 For this utility model Figure 3 A partial enlarged view of point B in the middle;

[0024] Figure 6 This is a schematic diagram of the location of the guide hole of the utility model;

[0025] Figure 7 This is a schematic diagram of the arc plate structure of the utility model;

[0026] Figure 8 This is a schematic diagram of the drive shaft structure of the utility model;

[0027] Fig. 9 It is a schematic structural diagram of the ratchet ring of the utility model.

[0028] In the figure: mounting frame 1, cylinder 2, steering shaft 3, conveying mechanism 4, cross beam 5, longitudinal beam 6, U-shaped frame 7, motor 8, roller 9, tensioning assembly 10, guide cross beam 11, heat sink 12, mounting block 13, guide groove 14, tensioning shaft 15, positioning screw 16, L-shaped plate 17, guide hole 18, arc plate 19, arc groove 20, drive shaft 21, torsion spring 22, ratchet ring 23, pawl 24, guide column 25. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1: Reference Figure 1 and Figure 2 A lane dividing device for an automatic conveyor includes: a mounting frame 1, a cylinder 2, a steering shaft 3 and a conveying mechanism 4, one end of the conveying mechanism 4 is hinged on the mounting frame 1, the top of the conveying mechanism 4 is plugged into and matched with the bearing at the output end of the cylinder 2, the top of the cylinder 2 is rotatably connected to the mounting frame 1, a plurality of second conveying mechanisms are longitudinally mounted on the mounting frame 1, the other end of the conveying mechanism 4 is arranged toward the input end of the second conveying mechanism, and the second conveying mechanism and the conveying mechanism 4 have the same structure.

[0032] The principle and effect of the above scheme are:

[0033] After the conveying mechanism 4 conveys the product to the second conveying mechanism, the output end of the cylinder 2 is started to move downward, the output end of the cylinder 2 drives the steering shaft 3 to move downward, the steering shaft 3 drives the output end of the conveying mechanism 4 to move downward around the end hinged with the mounting frame 1, the output end of the conveying mechanism 4 faces another second conveying mechanism and conveys the product. After the conveying of the product to the other second conveying mechanism is completed, the output end of the cylinder 2 is started again to move upward, the output end of the cylinder 2 drives the steering shaft 3 to move upward, the steering shaft 3 drives the output end of the conveying mechanism 4 to move upward around the end hinged with the mounting frame 1, and the reciprocating cycle is repeated;

[0034] By setting the end of the conveying mechanism 4 to be hinged with the mounting frame 1, the cylinder 2 moves upward or downward to convey the product to the second conveying mechanism, thereby saving the space occupied by the lane dividing device; at the same time, the cylinder is used to reduce the movement stroke of the lane dividing mechanism, thereby improving the efficiency of the lane dividing mechanism during operation; the steering shaft 3 and the conveying mechanism 4 are driven to move by the output end of the cylinder 2, thereby improving the accuracy of movement between components and reducing the difficulty of installation and debugging.

[0035] Example 2: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The conveying mechanism 4 includes: a crossbeam 5 and a longitudinal beam 6. A second steering shaft is installed on the mounting frame 1. Two bearing seats are hinged on the second steering shaft. One end of the crossbeam 5 is installed on the top surface of the bearing seat. Multiple longitudinal beams 6 are installed between the two crossbeams 5.

[0036] The conveying mechanism 4 also includes: a U-shaped frame 7, the bottom surface of the cross beam 5 is connected to the bottom wall of the U-shaped frame 7, the top of the U-shaped frame 7 placed on the cross beam 5 is equipped with a steering shaft 3, and the steering shaft 3 is equipped with multiple arc plates 19, and the multiple arc plates 19 form an auxiliary shaft, and the inner wall of the bearing is plugged into the auxiliary shaft.

[0037] The conveying mechanism 4 also includes: a motor 8, a roller 9 and a tensioning assembly 10. The motor 8 is installed on the beam 5. The output end of the motor 8 is equipped with one end of a rotating shaft. The other end of the rotating shaft is rotatably connected to another beam 5. Two rollers 9 are mounted on the rotating shaft. Each roller 9 is matched with a second roller through a belt transmission. The second roller is arranged on the tensioning assembly 10, and the tensioning assembly 10 is slidably connected to the beam 5.

[0038] The inner wall of the beam 5 is provided with a guide beam 11, and the top surface of the guide beam 11 is in sliding friction with the belt.

[0039] A heat sink 12 is mounted at the bottom end of the guide beam 11 , and the bottom end of the heat sink 12 is connected to the top surface of the longitudinal beam 6 .

[0040] The side wall of the cross beam 5 is connected to the inner wall of the L-shaped plate 17, and the top end of the L-shaped plate 17 is arranged toward the belt.

[0041] The principle and effect of the above scheme are:

[0042] A plurality of longitudinal beams 6 are installed between the two cross beams 5, which improves the stability between the two cross beams 5. The ends of the cross beams 5 are hinged to the second steering shaft through the bearing seat, which reduces the complexity of the device.

[0043] The bottom wall of the U-shaped frame 7 is connected to the bottom surface of the cross beam 5. The top of the U-shaped frame 7 placed on the cross beam 5 is equipped with a steering shaft 3. By setting the U-shaped frame 7 connected to the cross beam 5, sufficient space is reserved for the installation of the steering shaft 3 to avoid interference between parts.

[0044] During the upward or downward movement of the output end of the conveying mechanism 4, the motor 8 is started, and the output end of the motor 8 rotates to drive the rotating shaft and the roller 9 to rotate. The two rollers 9 are connected by a belt transmission, and the belt moves relative to the crossbeam 5 to convey the product. During the movement of the belt, the bottom surface of the belt slides with the top surface of the guide crossbeam 11. The guide crossbeam 11 provides support for the belt to prevent the belt from deforming during operation, causing the product to be longitudinally displaced during transportation, and to prevent the product from being stuck inside the conveying mechanism 4. A heat sink 12 is installed at the bottom end of the guide crossbeam 11. The heat sink 12 dissipates the heat generated by the sliding friction between the belt and the guide crossbeam 11 to prevent the belt from overheating and deformation after operation; the bottom end of the heat sink 12 is connected to the top surface of the longitudinal beam 6, which improves the stability of the installation of the heat sink 12;

[0045] The side wall of the beam 5 is connected to the inner wall of the L-shaped plate 17, and the top of the L-shaped plate 17 is set toward the belt. The L-shaped plate 17 can prevent dust from falling onto the surface of the belt. At the same time, the L-shaped plate 17 can cooperate with the belt and the beam 5 to guide the product, thereby improving the stability of the product during transportation.

[0046] Example 3: Reference Figure 3 , Figure 4 and Figure 5 The tensioning assembly 10 includes: a mounting block 13, a guide groove 14, a tensioning shaft 15 and a positioning screw 16. The end of the crossbeam 5 away from the motor 8 is provided with a guide groove 14, and the side wall of the crossbeam 5 is provided with a mounting block 13. The second guide groove on the mounting block 13 is concentrically arranged with the guide groove 14 and has the same area. The second guide groove and the guide groove 14 are both slidably connected to the end of the tensioning shaft 15. The mounting block 13 is threadedly connected with a positioning screw 16. The end of the positioning screw 16 is placed in the second guide groove and is threadedly connected to the screw hole on the side wall of the tensioning shaft 15.

[0047] The principle and effect of the above scheme are:

[0048] When the tension of the belt needs to be adjusted, the positioning screw 16 is rotated forward or reversed, and the tensioning shaft 15 moves left or right along the guide groove 14 and the second guide groove, and the tensioning shaft 15 drives a roller 9 to move left or right to tighten or loosen the belt;

[0049] By rotating the positioning screw 16, the positioning screw 16 drives the tensioning shaft 15 threadedly connected thereto to move leftward or rightward in the guide groove 14 and the second guide groove, so as to quickly adjust the tension of the belt.

[0050] Example 4: Reference Figure 6-Figure 9 A mounting hole is opened at the end of the steering shaft 3, and a driving member is rotatably connected in the mounting hole. The inner wall of the mounting hole is opened with the ends of multiple guide holes 18, and the other end of the guide hole 18 is opened on the side wall of the steering shaft 3. A guide plate is slidably connected in the guide hole 18, and the top end of the guide plate is connected to the bottom end of the arc plate 19. An arc groove 20 is opened on the end surface of the guide plate facing the driving member, and the arc groove 20 is bent in the direction away from the axis of the steering shaft 3, and the arc groove 20 is connected to the driving member.

[0051] The end of the arc groove 20 close to the motor 8 is higher than the end thereof far away from the motor 8 .

[0052] The principle and effect of the above scheme are:

[0053] After the bearing is sleeved on the steering shaft 3, when the bearing needs to be installed and tightened, the driving member is rotated counterclockwise, the end of the driving member is slidably connected with the arc groove 20, the guide plate moves outward along the guide hole 18, and the guide plate drives the arc plate 19 to move upward, and the top surface of the arc plate 19 contacts and cooperates with the inner wall of the bearing to clamp the bearing;

[0054] When the bearing needs to be disassembled, the driving member is rotated clockwise, the end of the driving member is slidably connected with the arc groove 20, the guide plate moves inward along the guide hole 18, and the guide plate drives the arc plate 19 to move downward, and the top surface of the arc plate 19 is out of contact with the inner wall of the bearing, so that the bearing can be removed easily;

[0055] An arc groove 20 is provided on the guide plate, and the arc groove 20 is slidably matched with the end of the driving member, so that the internal space of the component is fully utilized; the arc plate 19 is provided so that it can move outward or inward relative to the side wall of the steering shaft 3, so as to facilitate the clamping of bearings with different inner diameters; after the arc plate 19 clamps the bearing, a plurality of arc plates 19 are arranged at intervals, so that air can easily enter the inner wall of the bearing, and when the bearing works for a long time, it is convenient to quickly dissipate heat through the gaps between the arc plates 19.

[0056] Example 5: Reference Figure 6-Figure 9 The driving member includes: a driving shaft 21, a torsion spring 22, a ratchet ring 23 and a pawl 24. The mounting hole is rotatably connected to the driving shaft 21. An annular groove is opened on the inner wall of the mounting hole. The inner wall of the annular groove is connected to the mounting ring through the torsion spring 22. The mounting ring rotates with the annular groove and is fixed on the driving shaft 21. The side wall of the driving shaft 21 outside the steering shaft 3 is provided with a ratchet ring 23. The ratchet ring 23 is meshed with the pawl 24. The pawl 24 is connected to the steering shaft 3 through an unlocking shaft. The end of the second torsion spring on the side wall of the pawl 24 is connected to the end of the steering shaft 3. A plurality of guide columns 25 are provided on the other end of the driving shaft 21. The guide columns 25 are slidably connected to the circular arc groove 20.

[0057] The ratchet ring 23 is provided with a plurality of ratchet teeth, and the height of the top surface of the ratchet teeth facing the tensioning shaft 15 is lower than the height of the top surface of the ratchet teeth facing the motor 8 .

[0058] The principle and effect of the above scheme are:

[0059] The drive shaft 21 is rotated counterclockwise, and the drive shaft 21 drives the torsion spring 22 to twist and store elastic potential energy. The rotation of the drive shaft 21 drives the guide column 25 to rotate, and the guide column 25 is slidably connected with the circular arc groove 20. The guide plate drives the arc plate 19 to rise, and the ratchet ring 23 is meshed with the pawl 24. The pawl 24 prevents the ratchet ring 23 and the drive shaft 21 from resetting under the action of the second torsion spring.

[0060] The pawl 24 is rotated to disengage the pawl 24 from the ratchet ring 23. The ratchet ring 23 and the drive shaft 21 are reset synchronously under the elastic force of the torsion spring 22. The guide column 25 is rotated clockwise synchronously, and the guide plate drives the arc plate 19 to descend.

[0061] A pawl 24 is provided to be meshed with the ratchet ring 23, and a second torsion spring is connected between the pawl 24 and the steering shaft 3 to facilitate positioning of the drive shaft 21. The mounting ring on the drive shaft 21 is connected to the inner wall of the annular groove through the torsion spring 22 to facilitate rapid lowering of the arc plate 19 through the guide column 25.

[0062] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A lane dividing device for an automatic conveyor, characterized in that: include: A mounting frame (1), one end of a conveying mechanism (4) is hingedly connected to the mounting frame (1), the top end of the conveying mechanism (4) is plugged into and matched with a bearing at the output end of the cylinder (2), the top end of the cylinder (2) is rotatably connected to the mounting frame (1), a plurality of second conveying mechanisms are longitudinally mounted on the mounting frame (1), the other end of the conveying mechanism (4) is arranged toward the input end of the second conveying mechanism, and the second conveying mechanism and the conveying mechanism (4) have the same structure.

2. A lane dividing device for an automatic conveyor according to claim 1, characterized in that: The conveying mechanism (4) comprises a cross beam (5), a second steering shaft is mounted on the mounting frame (1), two bearing seats are hingedly connected to the second steering shaft, one end of the cross beam (5) is mounted on the top surface of the bearing seat, and a plurality of longitudinal beams (6) are mounted between the two cross beams (5).

3. The lane dividing device of an automatic conveyor according to claim 2, characterized in that: The conveying mechanism (4) further comprises: a U-shaped frame (7), the bottom surface of the cross beam (5) being connected to the bottom wall of the U-shaped frame (7), the top end of the U-shaped frame (7) being placed on the cross beam (5) being provided with a steering shaft (3), a plurality of arc-shaped plates (19) being provided on the steering shaft (3), the plurality of arc-shaped plates (19) forming an auxiliary shaft, and the inner wall of the bearing being plug-fitted with the auxiliary shaft.

4. The lane dividing device of an automatic conveyor according to claim 3, characterized in that: The conveying mechanism (4) also includes: a motor (8), the motor (8) is installed on the cross beam (5), one end of a rotating shaft is installed on the output end of the motor (8), the other end of the rotating shaft is rotatably connected to another cross beam (5), two rollers (9) are mounted on the rotating shaft, each roller (9) is driven by a second roller through a belt, the second roller is arranged on a tensioning assembly (10), and the tensioning assembly (10) is slidably connected to the cross beam (5).

5. The lane dividing device of an automatic conveyor according to claim 4, characterized in that: The inner wall of the cross beam (5) is provided with a guide cross beam (11), and the top surface of the guide cross beam (11) is in sliding friction with the belt.

6. The lane dividing device of an automatic conveyor according to claim 5, characterized in that: The bottom end of the guide crossbeam (11) is provided with a heat dissipation plate (12), and the bottom end of the heat dissipation plate (12) is connected to the top surface of the longitudinal beam (6).

7. The lane dividing device of an automatic conveyor according to claim 5, characterized in that: The tensioning assembly (10) comprises: a guide groove (14), the end of the cross beam (5) away from the motor (8) is provided with a guide groove (14), the side wall of the cross beam (5) is provided with a mounting block (13), the second guide groove on the mounting block (13) is concentrically arranged with the guide groove (14) and has an equal area, the second guide groove and the guide groove (14) are both slidably connected to the end of the tensioning shaft (15), a positioning screw (16) is threadedly connected to the mounting block (13), the end of the positioning screw (16) is placed in the second guide groove and is threadedly connected to the screw hole on the side wall of the tensioning shaft (15).

8. The lane dividing device of an automatic conveyor according to claim 7, characterized in that: The side wall of the cross beam (5) is connected to the inner wall of the L-shaped plate (17), and the top end of the L-shaped plate (17) is arranged toward the belt.

9. The lane dividing device of an automatic conveyor according to claim 3, characterized in that: The end of the steering shaft (3) is provided with a mounting hole, in which a driving member is rotatably connected, the inner wall of the mounting hole is provided with the ends of a plurality of guide holes (18), the other end of the guide hole (18) is provided on the side wall of the steering shaft (3), a guide plate is slidably connected in the guide hole (18), the top end of the guide plate is connected to the bottom end of the arc plate (19), an arc groove (20) is provided on the end surface of the guide plate facing the driving member, the arc groove (20) is bent in a direction away from the axis of the steering shaft (3), and the arc groove (20) is connected to the driving member.

10. The lane dividing device of an automatic conveyor according to claim 9, characterized in that: The driving member comprises: a driving shaft (21); the mounting hole is rotatably connected to the driving shaft (21); an annular groove is formed on the inner wall of the mounting hole; the inner wall of the annular groove is connected to the mounting ring via a torsion spring (22); the mounting ring is rotatably matched with the annular groove; the mounting ring is fixed on the driving shaft (21); a ratchet ring (23) is arranged on the side wall of the driving shaft (21) outside the steering shaft (3); the ratchet ring (23) is meshedly connected to a pawl (24); the pawl (24) is connected to the steering shaft (3) via an unlocking shaft; the end of a second torsion spring on the side wall of the pawl (24) is connected to the end of the steering shaft (3); a plurality of guide posts (25) are arranged on the other end of the driving shaft (21); the guide posts (25) are slidably connected to the circular arc groove (20).

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