A locking mechanism

Abstract

The utility model discloses a locking mechanism, which relates to the field of machine locking, and overcomes the problem in the prior art that the machine cannot be locked when folded or unfolded. The technical solution to solve the problem is mainly a locking mechanism, including a bearing shell, characterized in that the bearing shell is slidably connected with a limit pin that can partially extend out of the bearing shell, and the bearing shell is rotatably connected with a fixed plate outside, and at least two first limit grooves are arranged in the fixed plate at intervals in the circumferential direction. When the limit pin partially enters the first limit groove, the fixed plate and the bearing shell are circumferentially fixed, and the limit pin is provided with an elastic member for pushing the limit pin into the first limit groove, and the bearing shell is movably connected with a movable rod, and when the movable rod moves relative to the bearing shell, the movable rod abuts and lifts the limit pin, and the limit pin can be separated from the first limit groove. The utility model realizes the effect of locking the machine when it is folded or unfolded.

Description

Technical Field

[0001] The utility model relates to the field of machine locking, in particular to a locking mechanism. Background Art

[0002] Faced with the growing market for foldable storage products, consumers are increasingly paying attention to the precise performance of the machine during folding and unfolding operations, including reliable locking functions to ensure safe fixation, and smooth damping experience to control the rhythm of the movement and avoid rapid or accidental detachment of the device during switching, thereby meeting users' functional demands for smooth and safe transitions.

[0003] Furthermore, under the existing technical framework, most machine storage solutions rely on the process of disassembly and reassembly, and fail to achieve real instant storage. Although the pursuit of a one-step storage mode improves convenience, the lack of a locking function when folding or unfolding significantly increases the risk of damage to the machine structure, threatening its overall stability and service life. Therefore, the development of innovative storage technology that can ensure storage efficiency while taking into account machine safety has become a key issue that the industry urgently needs to solve. Utility Model Content

[0004] In order to overcome the problem in the prior art that a machine cannot be locked when folded or unfolded, the present invention provides a locking mechanism to achieve the effect of locking the machine when folded or unfolded.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a locking mechanism, including a bearing shell and a fixed plate, the bearing shell is slidably connected with a limit pin that can partially extend out of the bearing shell, the bearing shell is rotatably mounted on the fixed plate, at least two first limit grooves are provided in the fixed plate, and the at least two first limit grooves are circumferentially spaced on the fixed plate, when the limit pin partially enters the first limit groove, the fixed plate and the bearing shell are circumferentially fixed, the limit pin is provided with an elastic member for pushing the limit pin into the first limit groove, and the bearing shell is movably connected with a movable rod, when the movable rod moves relative to the bearing shell, the movable rod abuts and lifts the limit pin, and the limit pin can be disengaged from the first limit groove.

[0006] After adopting the above technical scheme, the utility model has the following advantages: by using a movable rod to lift the limit pin and disengage it from the first limit groove, the supporting shell and the fixed plate can rotate relative to each other, thereby realizing the smooth folding and unfolding of the machine connected to the supporting shell; once the machine reaches a predetermined folding or unfolding angle, the limit pin is embedded in another first limit groove due to the elastic force of the elastic part, and immediately reaches a locked state, thereby ensuring the safe and stable operation of the machine; the parts used in this design are simple in structure and small in number, which not only greatly reduces the production cost, but also simplifies the equipment adjustment process, achieving dual optimization of cost and efficiency.

[0007] Furthermore, the movable rod includes a body and a top plate, and the movable rod is rotatably connected to the bearing shell. When the movable rod rotates, the top plate can abut against and lift up the limiting pin, so that the limiting pin is separated from the first limiting groove.

[0008] By adopting the above-mentioned technical solution, the movable rod is rotated so that the top plate on the movable rod can lift the limit pin and make the limit pin disengage from the first limit groove. This method does not require reserving a sliding groove for the movable rod, nor does it require a large movement of the arm during operation. Compared with the method of moving the movable rod to lift the limit pin, the manufacturing cost is lower and the operation is more convenient.

[0009] Using the above technical solution,

[0010] Furthermore, the top plate (51) is a circular arc surface with an arc angle greater than 180° connected to a straight surface, the straight surface and the circular arc surface are transitionally connected via an arc surface, the center of the circular arc surface coincides with the axis of the movable rod, and the radius of the circular arc surface is greater than the unidirectional moving distance of the limit pin (2).

[0011] By adopting the above-mentioned technical solution, since the arc angle of the arc surface is greater than 180°, the straight surface can always abut against the limit pin. Since the radius of the arc surface is greater than the unidirectional moving distance of the limit pin, that is, the distance moved from when the limit pin is stuck in the first limit groove to when it moves out of the first limit groove, when the movable rod drives the top plate to rotate, the circumferential surface of the arc surface is prevented from abutting against the limit pin, making it impossible for the limit pin to be reset.

[0012] Furthermore, the top plate is connected by two arc surfaces with different radii and a straight surface, the arc angles of the two arc surfaces add up to greater than 180°, the arc surface and the straight surface are connected by an arc-shaped surface transition, the centers of the two arc surfaces coincide with the axis of the movable rod, the radius of one of the arc surfaces is greater than the unidirectional moving distance of the limit pin, and the radius of the other arc surface is smaller than the unidirectional moving distance of the limit pin.

[0013] By adopting the above-mentioned technical solution, the radius of one arc surface is larger than the unidirectional movement range of the limit pin, so that when the movable rod rotates in the direction of the arc surface, the arc surface can just abut and lift the limit pin, thereby allowing the limit pin to disengage from the first limit groove, and the circumferential surface of the arc surface itself avoids direct contact with the limit pin, so that after the operator releases the movable rod, the limit pin has a tendency to be stuck in the first limit groove, and the radius of another arc surface is smaller than the unidirectional movement distance of the limit pin, so that when the movable rod rotates in the direction of the arc surface, the circumferential surface of the arc surface can abut and lift the limit pin, thereby allowing the limit pin to disengage from the first limit groove. At this time, without the aid of external force, the limit pin will not have a tendency to be stuck in the first limit groove, so that the supporting shell is in a long-term unlocked state.

[0014] Furthermore, a knob is fixedly provided at one end of the movable rod.

[0015] By adopting the above technical solution, the user can control the rotation of the movable rod by rotating the knob.

[0016] Furthermore, the elastic member is installed between the movable rod and the limiting pin, and the abutment portion between the elastic member and the movable rod is an arc.

[0017] By adopting the above-mentioned technical solution, the elastic part is installed between the movable rod and the limit pin, making the installation of the elastic part more convenient. It is only necessary to place the elastic part on the limit pin first, and then press the elastic part between the movable rod and the limit pin. Since the abutment between the elastic part and the movable rod is an arc, the elastic part is not easy to pop out during installation.

[0018] Furthermore, a sliding groove is provided in the limit pin, the movable rod can pass through the sliding groove, and the limit pin moves radially in the movable rod. One side of the limit block is provided with a first platform facing the top plate, and the other side is provided with a second platform facing the elastic member. The top plate drives the limit pin to slide by lifting the first platform, and the elastic member is installed between the second platform and the movable rod.

[0019] By adopting the above-mentioned technical solution, the installation of the limit pin, the movable rod and the elastic member on the supporting shell is as follows: the movable rod is first rotated and connected to the supporting shell, and then the limit pin is slid through the groove sleeve on the movable rod to make the first platform and the top plate axially correspond, and then one end of the elastic member is placed on the second platform, and the other end is easier to be installed between the second platform and the movable rod because it is an arc.

[0020] Furthermore, an abutment block is provided on the side of the supporting shell, and a second limiting groove is provided in the fixing plate for limiting the rotation of the abutment block to a certain angle. When the abutment block abuts against one of the side walls of the second limiting groove, the limiting pin is aligned with the first limiting groove, and the limiting pin can enter the corresponding first limiting groove under the elastic force of the elastic member.

[0021] By adopting the above-mentioned technical solution, the cooperation between the abutment block and the second limit groove can prevent the supporting shell from turning too far during rotation, causing the limit pin and the first limit groove to be misaligned. When the abutment block on the supporting shell rotates around the axis of the supporting shell and abuts against the side wall of the second limit groove, the limit pin and the first limit groove correspond to each other, so that the limit pin is stuck in the first limit groove.

[0022] Furthermore, the bearing shell is axially provided with a shaft shoulder, an axial fixing piece is sleeved on the shaft shoulder, and the axial fixing piece presses the fixing plate against the shaft shoulder.

[0023] By adopting the above-mentioned technical solution, the fixing plate is pressed against the shaft shoulder through the axial fixing member, so that the friction between the load-bearing shell and the fixing plate can be increased, so that the machine will not be folded or unfolded too quickly, avoiding injuries to operators.

[0024] Furthermore, the axial fixing member is a pressure cover, the radial surface of the pressure cover encloses the limit pin and the elastic member in the bearing shell, the axial surface of the pressure cover and the shoulder clamp the fixing plate therebetween, a friction plate is provided between the shoulder and the fixing plate, and a friction plate is provided between the fixing plate and the axial fixing member.

[0025] By adopting the above-mentioned technical solution, the fixed plate is clamped between the axial surface and the shoulder of the pressure cover, thereby increasing the friction between the load-bearing shell and the fixed plate, so that the machine will not be folded or unfolded too quickly, thereby avoiding injury to the operator. At the same time, the limit pin and the elastic part are enclosed in the load-bearing shell by the pressure cover, which facilitates the installation and disassembly of the limit pin and the elastic part. By adding friction plates on both axial sides of the fixed plate, the friction between the fixed plate and the load-bearing shell is further increased, thereby further slowing down the folding or unfolding speed of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Figure 1 This is a full cross-sectional view of a locking mechanism of the utility model;

[0028] Figure 2 It is a three-dimensional diagram of a locking mechanism of the utility model;

[0029] Figure 3 A three-dimensional schematic diagram of a locking mechanism without a gland and a knob;

[0030] Figure 4 A three-dimensional schematic diagram of a locking mechanism without a knob;

[0031] Figure 5 A three-dimensional diagram of a stop pin, a fixing plate, an elastic member, a gland, a movable rod and a knob;

[0032] Figure 6 It is a front view of another embodiment of the top sheet.

[0033] Description of the drawings: 1. Load-bearing shell; 11. Abutment block; 12. Shoulder; 2. Limit pin; 21. Sliding through groove; 22. First platform; 23. Second platform; 3. Fixed plate; 31. First limit groove; 32. Second limit groove; 4. Elastic member; 41. Contact member; 42. Abutment spring; 5. Movable rod; 51. Top plate; 6. Knob; 7. Axial fixing member; 8. Pressure cover; 81. Radial surface; 82. Axial surface; 9. Friction plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0035] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0036] The technical solution of the utility model is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be repeated in some embodiments.

[0037] Embodiment 1:

[0038] like Figures 1 to 5 As shown, the utility model provides a locking mechanism, including a bearing shell 1 and a fixed plate 3, the bearing shell 1 being slidably connected with a limit pin 2 which can partially extend out of the bearing shell 1, the bearing shell 1 being externally rotatably mounted on the fixed plate 3, at least two first limit grooves 31 being arranged in the fixed plate 3, the at least two first limit grooves 31 being circumferentially spaced apart on the fixed plate 3, when the limit pin 2 partially enters the first limit groove 31, the fixed plate 3 and the bearing shell 1 are circumferentially fixed, the limit pin 2 is provided with an elastic member 4 for pushing the limit pin 2 into the first limit groove 31, the bearing shell 1 is movably connected with a movable rod 5, when the movable rod 5 moves relative to the bearing shell 1, the limit pin 2 can be disengaged from the first limit groove 31 when the movable rod 5 abuts against and lifts the limit pin 2.

[0039] After adopting the above technical scheme, the utility model has the following advantages: by using the movable rod 5 to lift the limit pin 2 and disengage it from the first limit groove 31, the carrier shell 1 and the fixed plate 3 can rotate relative to each other, thereby realizing the smooth folding and unfolding of the machine connected to the carrier shell 1; once the machine reaches a predetermined folding or unfolding angle, the limit pin 2 is embedded in the other first limit groove 31 due to the elastic force of the elastic member 4, and immediately reaches a locked state, thereby ensuring the safe and stable operation of the machine; the parts used in this design are simple in structure and small in number, which not only greatly reduces the production cost, but also simplifies the equipment adjustment process, thereby achieving dual optimization of cost and efficiency.

[0040] Specifically, the limit pin 2, the fixing plate 3, the elastic member 4 and the movable rod 5 constitute a locking assembly, and the locking assembly is mirror-imaged at both ends of the bearing shell, and the two groups of movable rods 5 are connected by a transmission sleeve to achieve synchronous rotation of the two groups of movable rods 5.

[0041] It can be understood that the fixing plate 3 is fixedly connected to the machine and is relatively stationary with the machine, while the supporting shell 1 is relatively rotating with respect to the machine.

[0042] Furthermore, the movable rod 5 includes a body and a top plate 51 . The movable rod 5 is rotatably connected to the supporting shell 1 . When the movable rod 5 rotates, the top plate 51 can abut against and lift the limiting pin 2 , so that the limiting pin 2 is separated from the first limiting groove 31 .

[0043] By adopting the above-mentioned technical solution, the movable rod 5 is rotated so that the top plate 51 on the movable rod 5 can lift the limit pin 2 and make the limit pin 2 disengage from the first limit groove 31. This method does not require reserving a sliding groove for the movable rod 5, nor does it require a large movement of the arm during operation. Compared with the method of moving the movable rod 5 to lift the limit pin 2, the manufacturing cost is lower and the operation is more convenient.

[0044] It can be understood that in another embodiment, when the operator moves the movable rod 5 away from the first limiting groove 31, the movable rod 5 drives the limiting pin 2 to disengage from the first limiting groove 31, so that the fixing plate 3 and the supporting shell 1 can rotate relative to each other.

[0045] Furthermore, the top plate 51 is a circular arc surface with an arc angle greater than 180° connected to a straight surface, the straight surface and the circular arc surface are transitionally connected via an arc surface, the center of the circular arc surface coincides with the axis of the movable rod 5, and the radius of the circular arc surface is greater than the unidirectional moving distance of the limit pin 2.

[0046] By adopting the above-mentioned technical solution, since the arc angle of the arc surface is greater than 180°, the straight surface can always abut against the limit pin 2. Since the radius of the arc surface is greater than the unidirectional moving distance of the limit pin 2, that is, the distance moved from when the limit pin 2 is stuck in the first limit groove 31 to when it moves out of the first limit groove 31, when the movable rod 5 drives the top plate 51 to rotate, the circumferential surface of the arc surface is prevented from abutting against the limit pin, making it impossible for the limit pin 2 to be reset.

[0047] It can be understood that in another embodiment, Figure 6 As shown, the top sheet 51 is connected by two arc surfaces with different radii and a straight surface, the arc angles of the two arc surfaces are greater than 180°, the arc surface and the straight surface are connected by an arc surface transition, the centers of the two arc surfaces coincide with the axis of the movable rod 5, and the radius of one of the arc surfaces is greater than the unidirectional moving distance of the limit pin 2, so that when the movable rod rotates in the direction of the arc surface, the intersection of the circumferential edge of the arc surface and the radial surface can just abut and lift the limit pin 2, while the circumferential surface of the arc surface itself avoids Due to direct contact with the limit pin 2, the limit pin 2 has a tendency to get stuck in the first limit groove 31 after the operator lets go of the movable rod. The radius of the other arc surface is smaller than the unidirectional movement distance of the limit pin 2, so that when the movable rod rotates in the direction of the arc surface, the circumferential surface of the arc surface can abut and lift the limit pin 2, thereby allowing the limit pin to disengage from the first limit groove 31. At this time, without the aid of external force, the limit pin 2 will not have a tendency to get stuck in the first limit groove 31, so that the supporting shell 1 is in a long-term unlocked state.

[0048] Furthermore, a knob 6 is fixedly provided at one end of the movable rod 5 .

[0049] By adopting the above technical solution, the user can control the rotation of the movable rod 5 by rotating the knob 6 .

[0050] Furthermore, the elastic member 4 is installed between the movable rod 5 and the limiting pin 2, and the abutment portion between the elastic member 4 and the movable rod 5 is an arc.

[0051] By adopting the above-mentioned technical solution, the elastic member 4 is installed between the movable rod 5 and the limit pin 2, making the installation of the elastic member 4 more convenient. It is only necessary to place the elastic member 4 on the limit pin 2 first, and then press the elastic member 4 between the movable rod 5 and the limit pin 2. Since the abutment between the elastic member 4 and the movable rod 5 is an arc, the elastic member 4 is not easy to pop out during installation.

[0052] Specifically, the elastic member 4 is composed of an upper contact block 41 and a lower abutment spring 42 . The abutment spring 42 is sleeved on the lower end of the cylindrical contact block 41 . The upper end of the contact block 41 abuts against the movable rod 5 .

[0053] Furthermore, a sliding groove 21 is provided in the limit pin 2, and the movable rod 5 can pass through the sliding groove 21, and the limit pin 2 moves radially in the movable rod 5. One side of the limit block is provided with a first platform 22 facing the top plate 51, and the other side is provided with a second platform 23 facing the elastic member 4. The top plate 51 drives the limit pin 2 to slide by lifting the first platform 22, and the elastic member 4 is installed between the second platform 23 and the movable rod 5.

[0054] By adopting the above-mentioned technical scheme, the installation of the limit pin 2, the movable rod 5 and the elastic member 4 on the supporting shell 1 is as follows: the movable rod 5 is first rotatably connected to the supporting shell 1, and then the limit pin 2 is slid through the groove 21 and is sleeved on the movable rod 5, so that the first platform 22 and the top plate 51 are axially corresponding, and then one end of the elastic member 4 is placed on the second platform 23, and the other end is easier to be inserted between the second platform 23 and the movable rod 5 because it is an arc.

[0055] Furthermore, an abutment block 11 is provided on the side of the supporting shell 1, and a second limiting groove 32 is provided in the fixing plate 3 for limiting the rotation of the abutment block 11 to a certain angle. When the abutment block 11 abuts against one of the side walls of the second limiting groove 32, the limiting pin 2 is aligned with the first limiting groove 31, and the limiting pin 2 can enter the corresponding first limiting groove 31 under the elastic force of the elastic member 4.

[0056] By adopting the above-mentioned technical solution, through the cooperation between the abutment block 11 and the second limit groove 32, the supporting shell 1 is prevented from turning too far during rotation, causing the limit pin 2 and the first limit groove 31 to be misaligned. When the abutment block 11 on the supporting shell 1 rotates around the axis of the supporting shell 1 and abuts against the side wall of the second limit groove 32, the limit pin 2 and the first limit groove 31 correspond, so that the limit pin 2 is stuck in the first limit groove 31.

[0057] Furthermore, the bearing shell 1 is axially provided with a shaft shoulder 12 , and an axial fixing member 7 is sleeved on the shaft shoulder 12 . The axial fixing member 7 presses the fixing plate 3 against the shaft shoulder 12 .

[0058] By adopting the above technical solution, the fixing plate 3 is pressed against the shaft shoulder 12 through the axial fixing member 7, so that the friction between the load-bearing shell 1 and the fixing plate 3 can be increased, so that the machine will not be folded or unfolded too quickly, avoiding injuries to operators.

[0059] Furthermore, the axial fixing member 7 is a pressure cover 8, and the radial surface 81 of the pressure cover 8 encloses the limit pin 2 and the elastic member 4 in the bearing shell 1, and the axial surface 82 of the pressure cover 8 and the shoulder 12 clamp the fixing plate 3 therebetween; a friction plate 9 is provided between the shoulder 12 and the fixing plate 3, and a friction plate 9 is provided between the fixing plate 3 and the axial fixing member 7.

[0060] By adopting the above-mentioned technical solution, the fixing plate 3 is clamped between the axial surface 82 and the shoulder 12 of the pressure cover 8, thereby increasing the friction between the load-bearing shell 1 and the fixing plate 3, so that the machine will not be folded or unfolded too quickly, thereby avoiding injuries to the operator. At the same time, the limit pin 2 and the elastic member 4 are enclosed in the load-bearing shell 1 by the pressure cover 8, which facilitates the installation and disassembly of the limit pin 2 and the elastic member 4; by adding friction plates 9 on both axial sides of the fixing plate 3, the friction between the fixing plate 3 and the load-bearing shell 1 is further increased, thereby further slowing down the folding or unfolding speed of the machine.

[0061] Specifically, the pressure cover 8 is installed on the bearing shell 1 by a plurality of bolts with springs, with one end of the spring abutting against the pressure cover 8 and the other end abutting against the bolt, so that after the bolt is tightened, the spring generates a pre-tightening force on the pressure cover 8, and by screwing the bolt to different positions, the force of the spring on the pressure cover is changed, and the pressure and friction force of the friction plate 9 on the fixed plate 3 are further changed. When the axial surface 82 of the pressure cover 8 abuts against the fixed plate 3, there is a gap between the radial surface 81 of the pressure cover 8 and the limit pin 2, so that the limit pin 2 can move in the space.

[0062] It can be understood that in another embodiment, the axial fixing member 7 can be a nut, which is threadedly connected to the load-bearing shell 1, so that the nut and the shoulder 12 clamp the fixing plate 3, thereby increasing the friction between the load-bearing shell 1 and the fixing plate 3, making it more convenient for operators to operate.

[0063] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A locking mechanism, comprising a bearing shell (1) and a fixing plate (3), characterized in that: The bearing shell (1) is slidably connected to a limit pin (2) capable of partially extending out of the bearing shell (1); the bearing shell (1) is rotatably mounted on a fixed plate (3); at least two first limit slots (31) are arranged in the fixed plate (3); the at least two first limit slots (31) are circumferentially spaced apart on the fixed plate (3); when the limit pin (2) partially enters the first limit slot (31), the fixed plate (3) and the bearing shell (1) are circumferentially fixed; an elastic member (4) for pushing the limit pin (2) into the first limit slot (31) is arranged on the limit pin (2); a movable rod (5) is movably connected to the bearing shell (1); when the movable rod (5) moves relative to the bearing shell (1), the movable rod (5) abuts against and lifts the limit pin (2), and the limit pin (2) can be separated from the first limit slot (31).

2. A locking mechanism according to claim 1, characterized in that: The movable rod (5) comprises a main body and a top plate (51). The movable rod (5) is rotatably connected to the supporting shell (1). When the movable rod (5) rotates, the top plate (51) can abut against and lift the limiting pin (2), so that the limiting pin (2) is separated from the first limiting groove (31).

3. A locking mechanism according to claim 2, characterized in that: The top plate (51) is a circular arc surface with an arc angle greater than 180° connected to a straight surface, the straight surface and the circular arc surface are transitionally connected via an arc surface, the center of the circular arc surface coincides with the axis of the movable rod (5), and the radius of the circular arc surface is greater than the unidirectional moving distance of the limiting pin (2).

4. A locking mechanism according to claim 2, characterized in that: The top plate (51) is connected by two arc surfaces with different radii and a straight surface, the arc angles of the two arc surfaces add up to more than 180°, the arc surface and the straight surface are connected by an arc surface transition, the centers of the two arc surfaces coincide with the axis of the movable rod (5), the radius of one of the arc surfaces is greater than the unidirectional moving distance of the limit pin (2), and the radius of the other arc surface is less than the unidirectional moving distance of the limit pin (2).

5. A locking mechanism according to claim 2, characterized in that: A knob (6) is fixedly provided at one end of the movable rod (5).

6. A locking mechanism according to claim 2, characterized in that: The elastic member (4) is installed between the movable rod (5) and the limiting pin (2), and the abutment portion between the elastic member (4) and the movable rod (5) is an arc.

7. A locking mechanism according to claim 5, characterized in that: The limit pin (2) is provided with a sliding groove (21), the movable rod (5) can pass through the sliding groove (21), and the limit pin (2) moves radially of the movable rod (5). One side of the limit pin (2) is provided with a first platform (22) facing the top plate (51), and the other side is provided with a second platform (23) facing the elastic member (4). The top plate (51) drives the limit pin (2) to slide by lifting the first platform (22), and the elastic member (4) is installed between the second platform (23) and the movable rod (5).

8. The locking mechanism according to claim 1, characterized in that: The side of the bearing shell (1) is provided with an abutment block (11), and the fixing plate (3) is provided with a second limiting groove (32) for limiting the rotation of the abutment block (11) to a certain angle. When the abutment block (11) abuts against one of the side walls of the second limiting groove (32), the limiting pin (2) is aligned with the first limiting groove (31), and the limiting pin (2) can enter the corresponding first limiting groove (31) under the elastic force of the elastic member (4).

9. The locking mechanism according to claim 1, characterized in that: The bearing shell (1) is axially provided with a shaft shoulder (12), an axial fixing member (7) is sleeved on the shaft shoulder (12), and the axial fixing member (7) presses the fixing plate (3) against the shaft shoulder (12).

10. A locking mechanism according to claim 9, characterized in that: The axial fixing member (7) is a pressure cover (8), the radial surface (81) of the pressure cover (8) seals the limit pin (2) and the elastic member (4) in the bearing shell (1), and the axial surface (82) of the pressure cover (8) and the shaft shoulder (12) clamp the fixing plate (3) therebetween; a friction plate (9) is provided between the shaft shoulder (12) and the fixing plate (3), and a friction plate (9) is provided between the fixing plate (3) and the axial fixing member (7).

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