A crab claw type positioning mechanism

Abstract

This application relates to a crab-claw type positioning mechanism, comprising: a mounting part; a clamping part symmetrically hinged to both sides of the mounting part; a positioning part fixedly connected to one end of the clamping part, with outwardly extending positioning pins respectively provided on their inwardly facing sides; a support part fixedly connected to the mounting part and located between the two positioning parts; and a first driving member, with its two ends respectively hinged to the ends of the clamping part away from the positioning part. By extending or retracting the output shaft of the first driving member, the clamping part hinged to both ends of the first driving member is driven to rotate clockwise or counterclockwise, causing the positioning part at the end of the clamping part to clamp or release the workpiece. Only one driving member is needed to realize the movement of the clamping parts on both sides. Through the positioning part and positioning pins, the workpiece can be positioned and clamped, occupying a small volume and facilitating welding torch operation.

Description

Technical Field

[0001] This application relates to the field of positioning welding technology, and in particular to a crab claw-type positioning mechanism. Background Technology

[0002] In the automotive manufacturing industry, the precision of the chassis welding process directly affects the structural strength and assembly reliability of the entire vehicle. During chassis production, numerous small bracket components need to be welded to the main structure, such as the chassis longitudinal beams. Currently, there is a type of U-shaped bracket, such as... Figure 1 As shown, during welding, the U-shaped bracket needs to be positioned and clamped to ensure the positioning accuracy of the bracket on the frame and to resist the influence of some arc welding heat deformation.

[0003] In traditional processes, a positioning mechanism is used to position the bracket, and another clamping mechanism is used to clamp the bracket. Positioning and clamping are achieved through multiple sets of independent drive components, resulting in a large volume. In the narrow space around the longitudinal beam of the vehicle frame, the complex structure seriously occupies the welding torch's working space, forcing the arc welding posture to deviate from the ideal angle, causing quality problems such as poor weld formation and insufficient welding strength. Summary of the Invention

[0004] This application provides a crab claw-type positioning mechanism to solve the problems of complex positioning and clamping mechanisms, large space occupation, and unfavorable conditions for welding torch operation in related technologies.

[0005] Firstly, a crab-claw-type positioning mechanism is provided, comprising:

[0006] Installation Department

[0007] The clamping part is symmetrically hinged to both sides of the mounting part;

[0008] The positioning part is fixedly connected to one end of the clamping part, and each of its inner sides is provided with outwardly protruding positioning pins.

[0009] A support portion is fixedly connected to the mounting portion and is located between the two positioning portions;

[0010] The first driving member has its two ends hinged to the end of the clamping part away from the positioning part.

[0011] In some embodiments, the mounting portion is provided with a first limiting block, which is located on the same side of the hinge point between the clamping portion and the mounting plate, and close to the positioning portion.

[0012] In some embodiments, the clamping part is provided with a second limiting block, which is located on the same side of the hinge point between the clamping part and the mounting plate, and close to the first driving member.

[0013] In some embodiments, the projection of the positioning pin onto the positioning portion is elliptical;

[0014] The positioning parts are provided with grooves on one side close to each other.

[0015] In some embodiments, the mounting portion includes:

[0016] Base

[0017] The flap is rotatably connected to the base via a hinge shaft;

[0018] The mounting plate is fixedly connected to the free end of the flip plate, and the clamping part is symmetrically hinged to both sides of the mounting plate;

[0019] The second driving component is hinged at one end to the base, and its output shaft is hinged to the flap.

[0020] In some embodiments, a limiting member is provided between the flap and the base, and the limiting member is located away from the hinge point between the flap and the base.

[0021] In some embodiments, the limiting member includes:

[0022] A limiting recess is fixedly installed at the bottom of the flap or the top of the base;

[0023] The limiting protrusion is a raised structure adapted to the limiting concave block, and is fixedly installed on the top of the base or the bottom of the flip plate.

[0024] In some embodiments, the clamping part is provided with a handle.

[0025] In some embodiments, the support portion is provided with a limiting groove that matches the position and shape of the positioning pin.

[0026] In some embodiments, the positioning part and the clamping part are fixedly connected by a connecting seat.

[0027] This application provides a crab-claw type positioning mechanism. When machining a part, a U-shaped bracket is placed on a support, with the two U-shaped sides of the bracket positioned between the support and the clamping parts. The output shaft of the first drive unit extends, driving the two clamping parts to rotate around their hinge points with the mounting part, bringing the positioning parts of the two clamping parts closer together. Positioning pins on the positioning parts are inserted into positioning holes on the U-shaped bracket. As the clamping parts continue to rotate, the positioning parts fix the U-shaped sides of the U-shaped bracket between the positioning part and the support, achieving positioning while clamping the part to be machined. After machining, the output shaft of the first drive unit shortens, driving the two clamping parts to rotate in opposite directions around their hinge points with the mounting part, moving the two clamping parts away from each other and releasing the workpiece. Only one drive unit is needed to move the clamping parts on both sides. The positioning parts and positioning pins enable positioning and clamping of the workpiece, occupying a small volume and facilitating welding torch operations. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the workpiece structure to be processed provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the crab claw-type positioning mechanism provided in the embodiments of this application;

[0031] Figure 3 This is a top view of the crab claw-type positioning mechanism provided in an embodiment of this application;

[0032] Figure 4 A schematic diagram of the state change structure of the crab claw-type positioning mechanism provided in the embodiments of this application (solid lines represent the clamped state, and dashed lines represent the loosened state).

[0033] Figure 5 This is a partially enlarged structural schematic diagram of the crab claw-type positioning mechanism provided in an embodiment of this application;

[0034] Figure 6 This is a partially enlarged structural diagram of the crab claw-type positioning mechanism used in this application embodiment when clamping a workpiece.

[0035] In the figure: 1. Mounting part; 11. First limiting block; 12. Second limiting block; 13. Base; 14. Flip plate; 15. Hinge shaft; 16. Mounting plate; 17. Second driving component; 18. Limiting component; 181. Limiting recess; 182. Limiting protrusion; 2. Clamping part; 21. Handle; 3. Positioning part; 31. Positioning pin; 4. Support part; 41. Limiting groove; 5. First driving component; 6. Connecting seat. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This application provides a crab-claw-type positioning mechanism, which can solve the problems of complex positioning and clamping mechanisms, large space occupation, and unfavorable welding torch operation in related technologies.

[0038] like Figures 2 to 6 As shown, a crab claw-type positioning mechanism includes:

[0039] Mounting part 1 has hinge shaft holes on both sides for mounting the hinge shaft of clamping part 2;

[0040] The clamping part 2 is symmetrically hinged to both sides of the mounting part 1 via a hinge axis, and can rotate around the axis to achieve opening and closing action;

[0041] The positioning part 3 is fixedly connected to one end of the clamping part 2, and each of the two parts is provided with outwardly protruding positioning pins 31 on their inner sides for insertion into the positioning holes of the workpiece.

[0042] The support part 4 is fixedly connected to the mounting part 1 and is located between the two positioning parts 3. It provides support for the workpiece while preventing the clamping part 2 from closing excessively.

[0043] The first driving member 5 has its two ends hinged to the end of the clamping part 2 away from the positioning part 3, and the clamping part 2 is rotated by the extension and retraction of the first driving member 5.

[0044] In this embodiment, the first driving component 5 is a hydraulic cylinder or a pneumatic cylinder. One end of the cylinder body is hinged to a clamping part 2, and one end of the piston rod is hinged to another clamping part 2. The piston rod is pushed to extend and retract by hydraulic or pneumatic pressure, which drives the clamping part 2 to rotate inward / outward around the hinge axis.

[0045] When machining parts, the U-shaped bracket is placed on the support part 4, with the two U-shaped sides of the U-shaped bracket positioned between the support part 4 and the clamping part 2. The output shaft of the first drive member 5 extends, driving the two clamping parts 2 to rotate around their hinge points with the mounting part 1, causing the positioning parts 3 of the two clamping parts 2 to move closer to each other. The positioning pins 31 on the positioning parts 3 are inserted into the positioning holes on the U-shaped bracket. As the clamping parts 2 continue to rotate, the positioning parts 3 fix the U-shaped sides of the U-shaped bracket between the positioning parts 3 and the support part 4, achieving positioning while clamping the workpiece to be machined. After machining, the output shaft of the first drive member 5 shortens, driving the two clamping parts 2 to rotate in opposite directions around their hinge points with the mounting part 1, causing the two clamping parts 2 to move away from each other and releasing the workpiece. Only one drive member is needed to realize the movement of the clamping parts 2 on both sides. Through the positioning parts 3 and the positioning pins 31, the positioning and clamping of the workpiece can be realized, occupying a small volume and facilitating welding torch operation.

[0046] In some alternative embodiments, the first driving component 5 is a motor-driven lead screw fixedly mounted on the mounting part 1. A servo motor or a stepper motor drives the bidirectional lead screw to rotate, and the linear motion of the bidirectional lead screw nut drives the clamping part 2 to move through the connecting rod.

[0047] Furthermore, such as Figure 2 As shown, the mounting part 1 includes:

[0048] The base 13, as the core support component, includes a raised base and an L-shaped support. The raised base increases the ground clearance of the overall structure, providing installation space for the second drive component 17. The L-shaped support is used to install the second drive component 17.

[0049] The flap 14 is rotatably connected to the base 13 via the hinge shaft 15, and the support part 4 can be fixedly connected to the flap 14 or the mounting plate 16.

[0050] Mounting plate 16 is fixedly connected to the free end of flip plate 14, and clamping part 2 is symmetrically hinged to both sides of mounting plate 16;

[0051] The second drive component 17 is hinged to the base 13 at one end, and its output shaft is hinged to the flap 14. The flap 14 has a protruding mounting seat on its side for mounting the second drive component 17.

[0052] In this embodiment, the first driving component 5 is a hydraulic cylinder or a pneumatic cylinder. One end of the cylinder body is hinged to a clamping part 2, and one end of the piston rod is hinged to another clamping part 2. The piston rod is pushed to extend and retract by hydraulic or pneumatic pressure, which drives the clamping part 2 to rotate inward / outward around the hinge axis.

[0053] After the positioning part 3 fixes the U-shaped edge of the U-shaped bracket between the positioning part 3 and the support part 4, thus achieving the positioning and clamping of the part to be processed, the output shaft of the second drive member 17 extends, driving the flip plate 14 to rotate around the hinge axis 15. The flip plate 14 drives the mounting plate 16 to flip together, so that the U-shaped bracket flips to a suitable position, facilitating the welding of the U-shaped bracket to the vehicle longitudinal beam. This effectively utilizes the lever principle to achieve a better torque balance. When the flip plate 14 tends to displace during operation, the end away from the hinge point can generate a larger limiting torque with a smaller force, thereby more efficiently constraining the movement of the flip plate 14.

[0054] Furthermore, a limiting member 18 is provided between the flip plate 14 and the base 13, and the limiting member 18 is away from the hinge point between the flip plate 14 and the base 13.

[0055] like Figure 2 As shown, the limiting component 18 effectively improves the stability and reliability of the flip plate 14 operation, avoids equipment failure caused by excessive displacement or deflection, and reduces maintenance frequency and cost. On the other hand, the high-precision limiting can ensure the accuracy of equipment operation. For some operation scenarios with high positional accuracy requirements, such as material flipping stations on automated production lines, it can ensure accurate material conveying and processing. Furthermore, the limiting design far from the hinge point reduces the stress on the hinge part between the flip plate 14 and the base 13, and extends the service life of the hinge component.

[0056] Furthermore, the limiting element 18 includes:

[0057] The limiting recess 181 is fixedly installed at the bottom of the flap 14 or the top of the base 13;

[0058] The limiting protrusion 182 is a protruding structure that matches the limiting concave block 181, and is fixedly installed on the top of the base 13 or the bottom of the flip plate 14.

[0059] like Figure 2 As shown in this application, the limiting recess 181 is provided with a U-shaped groove, which can provide bidirectional limiting in both horizontal and vertical directions. In some optional embodiments, the limiting recess 181 can also adopt a V-shaped groove or a stepped groove to meet the positioning accuracy requirements of the flip plate 14 under different working scenarios. The limiting protrusion 182 cooperates with the limiting recess 181 to limit the flip plate 14.

[0060] In this embodiment, the limiting recess 181 is fixedly installed at the bottom of the flap 14, and the limiting protrusion 182 is fixedly installed at the top of the base 13.

[0061] In some alternative embodiments, the limiting recess 181 may also be fixedly installed on the top of the base 13, and the limiting protrusion 182 may be fixedly installed on the bottom of the base 13.

[0062] Furthermore, the mounting part 1 is provided with a first limiting block 11, which is located on the same side of the hinge point between the clamping part 2 and the mounting plate 16, and is close to the positioning part 3.

[0063] like Figure 4 As shown, the solid line is a schematic diagram of the clamping state of the clamping part 2. When the output shaft of the first driving member 5 extends, it pushes the clamping part 2 to rotate around the pin shaft. After rotating to fit with the first limiting block 11, the output shaft of the first driving member 5 continues to move in the opposite direction to push the clamping part 2 on the other side to rotate and achieve clamping.

[0064] Furthermore, the clamping part 2 is provided with a second limiting block 12, which is located on the same side of the hinge point between the clamping part 2 and the mounting plate 16, and is close to the first driving member 5.

[0065] In this embodiment, the second limiting block 12 is a stud. The stud is installed by engaging with a pre-machined internal thread hole on the clamping part 2 via a thread. Its extension length can be precisely adjusted by rotating the stud according to actual working conditions, thus achieving fine-tuning of the rotational limiting position of the clamping part 2. When the stud is worn or the limiting position needs to be recalibrated, it can be directly disassembled, replaced, or adjusted. The operation is simple and quick, effectively reducing downtime for maintenance.

[0066] like Figure 4As shown, the dashed line represents the open state of the clamping part 2. The output shaft of the first driving member 5 retracts, driving the clamping part 2 to rotate around the pin. After the clamping part 2 is in contact with the second limiting block 12, the output shaft of the first driving member 5 continues to move in the opposite direction, driving the other side of the clamping part 2 to rotate, thus opening both sides.

[0067] In the crab-claw type double-sided pin-face positioning and clamping mechanism of this application, on the one hand, the double-sided clamping part 2 achieves synchronous and precise clamping and opening actions through the linkage design of the limiting block and the driving component, ensuring the consistency of the angle of the two clamping parts 2, effectively avoiding problems such as unstable workpiece clamping and positioning deviation caused by asynchronous clamping arms, and improving positioning accuracy and clamping reliability; on the other hand, the suspended installation of the first driving component 5, compared with the traditional installation method, reduces intermediate connecting parts, simplifies the mechanism structure, reduces energy loss in the mechanical transmission process, improves transmission efficiency, and reduces the overall weight, which facilitates equipment integration and layout; furthermore, the setting of the first limiting block 11 and the second limiting block 12 provides clear boundary constraints for the movement of the clamping part 2, which not only limits the movement range of the clamping part 2 and prevents mechanical damage caused by excessive rotation, but also enables precise control of the clamping arm angle by designing the position and shape of the limiting block, meeting the diverse needs for the clamping arm angle under different working conditions.

[0068] Furthermore, the projection of the positioning pin 31 onto the positioning part 3 is elliptical;

[0069] The positioning parts 3 have grooves on their adjacent sides.

[0070] Furthermore, the support part 4 is provided with a limiting groove 41 that matches the position and shape of the positioning pin 31.

[0071] In this embodiment, the support part 4 consists of two parallel support blocks, which are fixed on the mounting plate 16 or the flip plate 14. Each support block has a limiting groove 41 on its side wall that matches the position and shape of the positioning pin 31.

[0072] In some alternative embodiments, the support part 4 is a support block, and the two side walls of the support block are provided with limiting grooves 41 that match the position and shape of the positioning pin 31.

[0073] In this application, the locating pin 31 has an elliptical projection structure on the locating part 3, which, in conjunction with the groove on the locating part 3, improves positioning accuracy. The elliptical projection of the locating pin 31 breaks the limitation of traditional circular pins that can only restrict movement in two directions. The difference in size along its major and minor axes constrains the degree of freedom of the part along the major and minor axes of the ellipse to varying degrees during installation, effectively limiting the part's translation and rotation at a certain angle within the plane. Furthermore, when the groove on the locating part 3 mates with the corresponding slot on the part, it creates mechanical interference in the circumferential direction of the pin axis, further preventing the part from rotating around the pin axis. The combined effect of these two features constrains the spatial position of the part from multiple dimensions, providing more constraints compared to conventional locating pins.

[0074] In some optional embodiments, the locating pin 31 is an elastic ball-head locating pin. The body of the locating pin 31 is made of spring steel, and the end is connected to a ball head through an elastic joint. The surface of the ball head is provided with a wear-resistant coating. When the locating pin 31 is inserted into the workpiece locating hole, the ball head can adapt to the slight deviation of the workpiece hole position and automatically adjust the angle through elastic deformation to ensure that the locating pin fits tightly with the hole wall, thereby improving the positioning accuracy and fault tolerance.

[0075] Furthermore, the clamping part 2 is provided with a handle 21. The end of the handle 21 is spherical for easy gripping by the operator, and its surface is covered with non-slip rubber material.

[0076] During manual assembly, the initial positioning and pre-clamping of the parts can be quickly achieved by swinging the handle 21, without the need for additional tools or complicated operating procedures.

[0077] Optionally, the positioning part 3 and the clamping part 2 are fixedly connected by a connecting seat 6. For example... Figure 2 and Figure 3 As shown, the positioning part 3 and the clamping part 2 are fixedly connected by multiple L-shaped connecting seats 6. The connecting seats 6 are fixedly connected to the positioning part 3 and the clamping part 2 by bolts. In this way, the distance between the two positioning parts 3 can also be adjusted to adapt to the size of different parts.

[0078] How this application works:

[0079] The U-shaped edge of the U-shaped bracket is placed between the positioning part 3 and the support part 4. The clamping part 2 performs preliminary positioning and pre-clamping of the part by manually holding the handle 21 and swinging it.

[0080] The output shaft of the first driving member 5 extends out and pushes the clamping part 2 to rotate around the pin. The positioning pin 31 is inserted into the limiting groove 41 of the support part 4. After rotating to fit with the first limiting block 11, the output shaft of the first driving member 5 continues to move in the opposite direction to push the clamping part 2 on the other side to rotate. The positioning pin 31 is inserted into the limiting groove 41 of the support part 4 to limit the U-shaped bracket. At the same time, the positioning part 3 clamps the U-shaped bracket, realizing the positioning and clamping of the workpiece by the positioning part 3.

[0081] Then, the output shaft of the second drive unit 17 extends, driving the flap 14 to rotate around the hinge shaft 15. The flap 14 drives the mounting plate 16 to flip together, so that the U-shaped bracket flips to the appropriate position, which facilitates the welding of the U-shaped bracket to the vehicle longitudinal beam.

[0082] After welding is completed, the output shaft of the first drive member 5 retracts, and drives the clamping part 2 to rotate around the pin shaft. The positioning pin 31 moves away from the limiting groove 41 of the support part 4. After the clamping part 2 is in contact with the second limiting block 12, the output shaft of the first drive member 5 continues to move in the opposite direction to drive the clamping part 2 on the other side to rotate. The positioning pin 31 moves away from the limiting groove 41 of the support part 4, the clamping part 2 opens, and the positioning part 3 releases the U-shaped bracket and continues to position and clamp the next workpiece.

[0083] In the crab-claw-type positioning mechanism of this application, firstly, the dual-sided clamping parts 2 achieve synchronous and precise clamping and opening actions through the linkage design of the limiting blocks and driving components, ensuring the consistency of the angles of the two clamping parts 2, effectively avoiding problems such as unstable workpiece clamping and positioning deviation caused by asynchronous clamping arms, and improving positioning accuracy and clamping reliability; secondly, the suspended installation of the first driving component 5, compared with the traditional installation method, reduces intermediate connecting parts, simplifies the mechanism structure, reduces energy loss in the mechanical transmission process, improves transmission efficiency, and reduces the overall weight, facilitating equipment integration and layout; thirdly, the setting of the first limiting block 11 and the second limiting block 12 provides clear boundary constraints for the movement of the clamping parts 2, not only limiting the range of movement of the clamping parts 2 and preventing mechanical damage caused by excessive rotation, but also achieving precise control of the clamping arm angle by designing the position and shape of the limiting blocks, meeting the diverse needs for the clamping arm angle under different working conditions; fourthly, the positioning pin 31 presents an elliptical projection structure on the positioning part 3, which, together with the groove on the positioning part 3, can improve positioning accuracy. The elliptical projection positioning pin 31 breaks the limitation of traditional circular pins that can only restrict movement in two directions. The dimensional difference in its major and minor axes constrains the degree of freedom of the part along the major and minor axes of the ellipse during installation, effectively limiting the part's translation and rotation at a certain angle within the plane. Furthermore, the groove on the positioning part 3, when engaging with the corresponding slot on the part, creates mechanical interference in the circumferential direction of the pin axis, further preventing the part from rotating around the pin axis. The combined effect of these two elements constrains the spatial position of the part from multiple dimensions, providing more constraints compared to conventional positioning pins. The overall structure is compact, effectively saving installation space, and is particularly suitable for the positioning and clamping needs of small bracket-type parts, creating favorable conditions for subsequent welding processes.

[0084] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0085] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0086] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A crab claw-type positioning mechanism, characterized in that, It includes: Installation section (1) The clamping part (2) is symmetrically hinged to both sides of the mounting part (1); The positioning part (3) is fixedly connected to one end of the clamping part (2), and each of the two parts is provided with outwardly extending positioning pins (31) on their respective inner sides. The support part (4) is fixedly connected to the mounting part (1) and is located between the two positioning parts (3); The first driving member (5) has its two ends hinged to the end of the clamping part (2) away from the positioning part (3).

2. The crab claw-type positioning mechanism as described in claim 1, characterized in that: The mounting part (1) includes: Base (13) The flap (14) is rotatably connected to the base (13) via a hinge shaft (15); Mounting plate (16) is fixedly connected to the free end of the flip plate (14), and the clamping part (2) is symmetrically hinged to both sides of the mounting plate (16); The second drive unit (17) is hinged at one end to the base (13), and its output shaft is hinged to the flap (14).

3. The crab claw-type positioning mechanism as described in claim 2, characterized in that: The mounting part (1) is provided with a first limiting block (11), which is located on the same side of the hinge point between the clamping part (2) and the mounting plate (16) and is close to the positioning part (3).

4. The crab claw-type positioning mechanism as described in claim 2, characterized in that: The clamping part (2) is provided with a second limiting block (12), which is located on the same side of the hinge point between the clamping part (2) and the mounting plate (16) and is close to the first driving member (5).

5. The crab claw-type positioning mechanism as described in claim 2, characterized in that: A limiting member (18) is provided between the flip plate (14) and the base (13), and the limiting member (18) is away from the hinge point between the flip plate (14) and the base (13).

6. The crab claw-type positioning mechanism as described in claim 5, characterized in that: The limiting member (18) includes: A limiting recess (181) is fixedly installed at the bottom of the flap (14) or the top of the base (13); The limiting protrusion (182) is a protruding structure adapted to the limiting concave block (181), and is fixedly set on the top of the base (13) or the bottom of the flip plate (14).

7. The crab claw-type positioning mechanism as described in claim 1, characterized in that: The projection of the positioning pin (31) on the positioning part (3) is elliptical; The positioning parts (3) have grooves on their adjacent sides.

8. The crab claw-type positioning mechanism as described in claim 1, characterized in that: The clamping part (2) is provided with a handle (21).

9. The crab claw-type positioning mechanism as described in claim 1, characterized in that: The support part (4) is provided with a limiting groove (41) that matches the position and shape of the positioning pin (31).

10. The crab claw-type positioning mechanism as described in claim 1, characterized in that: The positioning part (3) and the clamping part (2) are fixedly connected by a connecting seat (6).

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