Device and method for locking, positioning, pressing and locking cotter pin

Abstract

The invention discloses a cotter pin locking, positioning, press-fitting and locking device and method, and belongs to the technical field of aero-engine assembly.The cotter pin locking, positioning, press-fitting and locking device comprises a left plier handle, a right plier handle, a left jaw, a right jaw and fixing parts, the left plier handle and the right plier handle are fixed to the corresponding jaws through the fixing parts, and the left plier handle and the right plier handle are hinged through the fixing parts; a notch is formed in the force application face of the right jaw to stop the head of the cotter pin, and the width of the left jaw is matched with the linkage ring to limit tail locking. The method comprises the steps that the cotter pin penetrates into a linkage ring pin hole, a right jaw notch of the device is used for stopping the head of the cotter pin, a left jaw abuts against the tail to exert force for locking, the direction is adjusted, operation is repeated, and locking of the other side is completed. The cotter pin press-fitting and locking device can achieve one-time in-place locking and press-fitting and locking of the cotter pin, guarantees the assembling quality, improves the efficiency, reduces the labor intensity, and can also be used for assembling cotter pins of similar structures.

Description

Technical Field

[0001] This application belongs to the technical field of aero-engine assembly, and specifically relates to a cotter pin stop positioning press-fit locking device and method. Background Technology

[0002] In the field of compressor stator assembly for aero-engines, blades at each stage are connected to the linkage ring via rocker arms and linkage ring blade pins. Cotter pins are key components for stopping the linkage ring blade pins, and their assembly quality directly determines the reliability of the adjustment mechanism. If the cotter pins are improperly assembled, causing the linkage ring blade pins to come off, it can lead to the rocker arms falling off or even the entire adjustment mechanism failing.

[0003] The current cotter pin assembly process suffers from three major problems due to the lack of specialized equipment and reliance on hammers, mandrels, and needle-nose pliers: First, the cotter pin head stop is unreliable. The serrated cross-section of the needle-nose pliers cannot be properly fitted to the cotter pin head, easily causing the head to slip or even be damaged during force application, directly destroying the stop mechanism. Second, the locking limit at the cotter pin tail is missing. The width of the needle-nose pliers does not match the width of the cotter pin locking trajectory on the linkage ring. Insufficient force will not lock it in one go, while excessive force will damage the cotter pin tail. Furthermore, accidental detachment of the needle-nose pliers can scratch the linkage ring. Third, the operation is inefficient and carries a high risk of damage. With a large number of cotter pins, traditional tools require repeated adjustments, and cotter pins that are not properly assembled require secondary processing with hammers and mandrels, which is time-consuming and laborious, and further increases the probability of damage to the cotter pin tail and linkage ring. Summary of the Invention

[0004] The purpose of this application is to provide a cotter pin stop positioning press-fit locking device and method. This addresses the problems mentioned in the background art where, when assembling cotter pins using a hammer, mandrel, and needle-nose pliers, the cotter pin head stop is unreliable, the tail locking lacks precise positioning, and the operation is time-consuming, laborious, and prone to damaging the cotter pin and linkage ring.

[0005] To achieve the above objectives, this application adopts the following technical solution: In one aspect, a cotter pin stop positioning press-fit locking device is provided, including a left clamp handle, a right clamp handle, a left jaw, a right jaw and a fixing component; The left pliers handle and the left jaw are connected by a fastener, the right pliers handle and the right jaw are connected by a fastener, and the left pliers handle and the right jaw are hinged by a fastener. The force-applying surface of the right jaw is provided with a groove for stopping the head of the cotter pin. The width of the left jaw is adapted to the width of the linkage ring, and is used to limit the locking process of the cotter pin tail.

[0006] In one possible implementation, the inner wall of the slot of the right jaw is a circular arc transition structure, and the radius of the arc is adapted to the radius of the cotter pin head.

[0007] In one possible implementation, the working ends of the left and right jaws are made of a high-hardness alloy material, and the surfaces of the working ends are polished.

[0008] In one possible implementation, the outer surfaces of the left and right clamp handles are covered with anti-slip rubber sleeves, and the surface of the anti-slip rubber sleeves is provided with anti-slip texture.

[0009] In one possible implementation, the fastener is made of a corrosion-resistant material and has a protective structure on its surface.

[0010] Secondly, a cotter pin stop positioning press-fit locking method is provided, employing the cotter pin stop positioning press-fit locking device described in any one of the first aspects, comprising the following steps: S1: Insert the cotter pin into the linkage ring pin hole to stop the linkage ring blade pin. S2: Insert the head of the cotter pin into the groove of the right jaw, thereby axially limiting and radially stopping the cotter pin through the groove; S3: Press the left jaw against the tail of the cotter pin, and by applying force to the left and right jaws, lock the cotter pin onto the linkage ring in one go; S4: Adjust the orientation of the device and repeat steps S2 and S3 to complete the locking of the other end of the cotter pin.

[0011] In one possible implementation, in step S1, after the cotter pin is inserted into the pin hole, the fit between the cotter pin and the pin hole needs to be checked to ensure that the cotter pin is not loose in the pin hole.

[0012] In one possible implementation, in step S3, when applying force, the left jaws are kept in complete contact with the mating surface of the cotter pin tail to avoid localized force causing deformation of the cotter pin.

[0013] In one possible implementation, in step S4, the clamp handle is loosened before adjusting the direction of the device, and the angle is adjusted only after the jaws are disengaged from the cotter pin, in order to prevent scratching the linkage ring.

[0014] In one possible implementation, after locking the tail ends of both sides of the cotter pin, check the cotter pin's locking status to ensure that the cotter pin is not loose or deformed, and that the surface of the linkage ring is free of scratches.

[0015] Compared with the prior art, this application has the following beneficial effects: This application provides a cotter pin stop positioning press-fit locking device, which achieves a stable connection between the clamp handle and the jaws and a flexible hinge between the clamp handles through a fixing component, ensuring the overall structural reliability of the device; the right jaw groove can form a precise stop on the head of the cotter pin, avoiding the head slippage and biting problems caused by traditional tools; the width of the left jaw is adapted to the linkage ring, realizing the tail of the cotter pin is locked in place in one go, avoiding damage to parts caused by improper force application; the reasonable ratio of the force arm and the resistance arm reduces the force intensity of the operator, takes into account the assembly reliability and operation convenience, and solves the problem of time-consuming and labor-intensive traditional assembly.

[0016] In one possible implementation, the arc transition structure fits more closely to the cotter pin head, further improving the head's stopping stability, while preventing the groove edge from scratching or indenting the cotter pin head, protecting the cotter pin's appearance and structural integrity, ensuring its stopping function is not damaged, and improving assembly quality consistency.

[0017] In one possible implementation, high-hardness wear-resistant materials effectively improve the wear resistance of the working end of the jaws, preventing jaw deformation and wear from causing a decrease in stopping and limiting accuracy after long-term use; nitriding treatment further enhances surface hardness and corrosion resistance, extends the service life of the device, reduces the cost of frequent tool replacements, and ensures the stability of mass cotter pin assembly.

[0018] In one possible implementation, the anti-slip sleeve and anti-slip texture increase the friction between the hand and the pliers handle, preventing the tool from slipping due to sweaty hands or excessive force during operation, thus improving grip stability and operational safety; the nitrile rubber material combines elasticity and wear resistance, improving grip comfort and further reducing fatigue during long-term operation, meeting ergonomic design requirements.

[0019] A cotter pin stop positioning press-fit locking method, through standardized operating procedures and combined with the stop and limit functions of a special device, achieves precise control of the entire process from installation to locking of the cotter pin, avoiding the problems of repeated adjustments and secondary processing required by traditional tools; a single locking operation significantly shortens the assembly time of a single cotter pin, improves assembly efficiency, and at the same time ensures consistent locking quality of each cotter pin, guarantees the stop reliability of the linkage ring blade pin, and reduces the risk of adjustment mechanism failure.

[0020] In one possible implementation, the contact surfaces are in complete contact to ensure that the cotter pin tail is subjected to uniform force, avoiding bending and deformation of the cotter pin caused by excessive local force, and ensuring the structural integrity and locking function of the cotter pin; the uniformly increasing force application method further avoids damage to parts caused by instantaneous impact force, improves assembly quality, and reduces rework and scrap costs caused by cotter pin deformation.

[0021] In one possible implementation, the contact surfaces are in complete contact to ensure that the cotter pin tail is subjected to uniform force, avoiding bending and deformation of the cotter pin caused by excessive local force, and ensuring the structural integrity and locking function of the cotter pin; the uniformly increasing force application method further avoids damage to parts caused by instantaneous impact force, improves assembly quality, and reduces rework and scrap costs caused by cotter pin deformation.

[0022] In one possible implementation, visual inspection and tactile confirmation can be used to quickly verify the locking status of cotter pins, preventing loose or deformed cotter pins from being put into use and ensuring the reliability of the adjustment mechanism. Surface roughness inspection further ensures the surface quality of the linkage ring, meeting the assembly requirements of precision parts for aero-engines, reducing subsequent assembly problems caused by surface defects of parts, and improving the overall assembly quality and service life of the compressor stator assembly. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of a cotter pin assembly provided in this application; Figure 2 This is a schematic diagram of the overall structure of a cotter pin stop positioning press-fit locking device provided in this application.

[0024] The attached diagram is labeled as follows: 1. Right jaw; 2. Left jaw; 3. Left jaw; 4. Right jaw; 5. First countersunk rivet; 6. Second countersunk rivet; 7. Semi-circular head rivet; 8. Cotter pin; 9. Blade; 10. Rocker arm; 11. Linkage ring blade pin; 12. Self-locking nut. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] 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, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] In this embodiment of the application, the cotter pin 8 assembly structure corresponds to Figure 1 As shown, this structure is the core structure for the connection and stop of the linkage ring and blade 9 in the stator assembly of the compressor of an aero-engine. It mainly includes a self-locking nut 12, a cotter pin 8, a blade 9, a rocker arm 10, and a linkage ring blade 9 pin, and the width of the linkage ring is defined as L1.

[0032] Among them, the blade 9 is the adjustable stator blade 9 of the compressor stator assembly. It is connected to the linkage ring through the rocker arm 10. One end of the rocker arm 10 is hinged to the blade 9, and the other end is fixed to the linkage ring through the linkage ring blade 9 pin. The linkage ring blade 9 pin passes through the corresponding pin hole of the rocker arm 10 and the linkage ring. In order to prevent the linkage ring blade 9 pin from coming out along the pin hole axially during the operation of the adjustment mechanism, the linkage ring blade 9 pin needs to be stopped and limited by the cotter pin 8.

[0033] The specific assembly relationship is as follows: the pin body of the linkage ring blade 9 pin is provided with a pin hole that matches the cotter pin 8. After the cotter pin 8 is inserted into the pin hole, its tail needs to be bent to both sides and pressed against the surface of the linkage ring to form a mechanical stop. At the same time, the end of the linkage ring blade 9 pin is further fixed by the self-locking nut 12 to further enhance the connection stability and prevent the pin body from loosening radially.

[0034] In this structure, the stopping reliability of the cotter pin 8 directly determines the anti-detachment effect of the linkage ring blade 9 pin. If the cotter pin 8 is not properly assembled, such as the head slipping, the tail not being locked or damaged, the linkage ring blade 9 pin will come off, which will cause the rocker arm 10 to fall off, and ultimately cause the adjustment mechanism of the compressor stator assembly to fail. Therefore, the accurate assembly of the cotter pin 8 is crucial to the reliability of the entire structure.

[0035] like Figure 2 As shown, this application discloses a cotter pin stop positioning press-fit locking device, which may include a left clamp handle 2, a right clamp handle 1, a left jaw 3, a right jaw 4, and a fixing component.

[0036] The left pliers handle 2 is connected to the left jaw 3 by a fastener, and the right pliers handle 1 is connected to the right jaw 4 by a fastener. The left pliers handle 2 and the right jaw 4 are hinged by a fastener.

[0037] The fastener can be either a countersunk rivet or a semi-circular head rivet 7. When a countersunk rivet is selected, it includes a first countersunk rivet 5 and a second countersunk rivet 6. The left jaw 2 and the left jaw 3 are connected by the first countersunk rivet 5 and the second countersunk rivet 6 respectively. The right jaw 1 and the right jaw 4 are connected by the first countersunk rivet 5 and the second countersunk rivet 6. The left jaw 2 and the right jaw 1 are hinged by a semi-circular head rivet 7.

[0038] The force-applying surface of the right jaw 4 has a groove for stopping the head of the cotter pin 8.

[0039] The width of the left jaw 3 is adapted to the width of the linkage ring, and is used to limit the locking process of the tail of the cotter pin 8.

[0040] The groove width of the force-applying surface of the right jaw 4 is set to 4mm to match the circular feature of the cotter pin 8 head; the width L2 of the left jaw 3 is equal to the width L1 of the linkage ring, and the specific dimensions are determined according to the actual specifications of the linkage ring of the compressor stator assembly.

[0041] The device has a force arm length of 200mm and a resistance arm length of 25mm, with a force arm to resistance arm ratio of 8, which meets the ergonomic requirements for force application.

[0042] In this embodiment, a fastener is used to achieve a stable connection between the pliers handle and the jaws, as well as a flexible hinge between the pliers handle, ensuring the overall structural reliability of the device. The slot of the right jaw 4 can precisely stop the head of the cotter pin 8, avoiding the head slippage and damage caused by traditional tools. The width of the left jaw 3 is adapted to the linkage ring, enabling the tail of the cotter pin 8 to be locked in place in one go, avoiding damage to parts caused by improper force application. The reasonable ratio of the force arm to the resistance arm reduces the force intensity applied by the operator, taking into account both assembly reliability and operation convenience, and solving the problem of time-consuming and labor-intensive traditional assembly.

[0043] In one possible embodiment, the inner wall of the slot of the right jaw 4 is a rounded transition structure, and the radius of the rounded arc is adapted to the radius of the head of the cotter pin 8.

[0044] Optionally, the radius of the arc transition structure on the inner wall of the right jaw 4 slot is set to 1.5mm, and the arc surface is polished to avoid sharp edges from contacting the head of the cotter pin 8.

[0045] In this embodiment, the arc transition structure fits more closely with the head of the cotter pin 8, further improving the head's stopping stability. At the same time, it avoids scratches and indentations on the head of the cotter pin 8 caused by the edge of the slot, protecting the appearance and structural integrity of the cotter pin 8, ensuring that its stopping function is not damaged, and improving the consistency of assembly quality.

[0046] In one possible embodiment, the working ends of the left jaw 3 and the right jaw 4 are made of high-hardness alloy material, and the surfaces of the working ends are polished.

[0047] Specifically, the working ends of the left jaw 3 and the right jaw 4 are made of chromium-molybdenum alloy steel with a hardness of HRC50-55. The working end surfaces are nitrided with a thickness of 0.1-0.2 mm.

[0048] In this embodiment, the high-hardness wear-resistant material effectively improves the wear resistance of the working end of the jaws, avoiding the decrease in stopping and limiting accuracy caused by jaw deformation and wear after long-term use; the nitriding treatment further enhances the surface hardness and corrosion resistance, extends the service life of the device, reduces the cost of frequent tool replacement, and ensures the stability of mass cotter pin assembly.

[0049] In one possible embodiment, the outer surfaces of the left clamp handle 2 and the right clamp handle 1 are covered with anti-slip rubber sleeves, and the surface of the anti-slip rubber sleeves is provided with anti-slip textures.

[0050] Optionally, the outer surfaces of the left clamp handle 2 and the right clamp handle 1 are covered with nitrile rubber anti-slip sleeves with a thickness of 2mm. The anti-slip sleeves have transverse anti-slip textures with a spacing of 1mm and a texture depth of 0.3mm.

[0051] In this embodiment, the anti-slip sleeve and anti-slip texture increase the friction between the hand and the pliers handle, preventing the tool from slipping due to sweaty hands or excessive force during operation, thus improving grip stability and operational safety; the nitrile rubber material combines elasticity and wear resistance, improving grip comfort and further reducing fatigue during long-term operation, meeting ergonomic design requirements.

[0052] In one possible embodiment, the fastener is made of a corrosion-resistant material and has a protective structure on its surface.

[0053] Specifically, the fastener can be configured as a countersunk rivet, a semi-circular head rivet, etc., and can be made of 304 stainless steel. The rivet surface is passivated, and the passivation film thickness is 5-10μm.

[0054] In this embodiment, because 304 stainless steel has excellent corrosion resistance, it can prevent the device from rusting in the humid and oily environment of the aero-engine assembly workshop; passivation treatment further enhances the surface protection capability, prevents the connection from loosening due to rivet corrosion, ensures the long-term stability of the device structure, avoids assembly accidents caused by fastener failure, and improves the reliability of tool use.

[0055] A cotter pin stop positioning and locking method, using the aforementioned device, includes the following steps: S1: Insert the cotter pin 8 into the 5mm diameter pin hole of the linkage ring.

[0056] S2: The head of the cotter pin 8 is inserted into the 44mm wide slot of the right jaw.

[0057] S3: Press the left jaw 3 against the tail of the cotter pin 8, and apply a force of 50-80N through the jaw handle to lock the cotter pin 8 in one go.

[0058] S4: Rotate the device 180°, repeat steps S2 and S3 to complete the locking of the other tail.

[0059] In this embodiment, through standardized operating procedures and the stop and limit functions of a dedicated device, precise control of the entire process from installation to locking of the cotter pin 8 is achieved, avoiding the problem of repeated adjustments and secondary processing required by traditional tools; a single locking operation significantly shortens the assembly time of a single cotter pin 8, improves assembly efficiency, and ensures consistent locking quality of each cotter pin 8, ensuring the stop reliability of the linkage ring blade 9 pin and reducing the risk of adjustment mechanism failure.

[0060] In one possible embodiment, in step S1, after the cotter pin 8 is inserted into the pin hole, the fit between the cotter pin 8 and the pin hole needs to be checked to ensure that the cotter pin 8 is not loose in the pin hole.

[0061] Optionally, after the cotter pin 8 is inserted into the pin hole in step S1, a plug gauge is used to check the fit clearance between the cotter pin 8 and the pin hole. The plug gauge specifications are 0.05mm and 0.1mm. It is ensured that the 0.1mm plug gauge cannot be inserted into the gap, that is, the fit clearance is not greater than 0.1mm.

[0062] In this embodiment, the fit accuracy between the cotter pin 8 and the pin hole is ensured by checking with a plug gauge. This prevents the cotter pin 8 from shifting or loosening during the subsequent locking process due to excessive fit clearance, ensuring the accuracy of the initial installation position of the cotter pin 8. This provides a stable foundation for subsequent stopping and locking, further improving the overall reliability of the cotter pin 8 assembly and avoiding stopping failure caused by initial installation defects.

[0063] In one possible embodiment, in step S3, when applying force, the left jaw 3 is kept in complete contact with the tail of the cotter pin 8 to avoid localized force causing deformation of the cotter pin 8.

[0064] Specifically, in step S3, the mating surfaces of the left jaw 3 and the tail of the cotter pin 8 are flat. When applying force, visual observation and tactile confirmation are used to ensure that the mating surfaces are in complete contact, and the applied force is increased evenly to the required strength.

[0065] In this embodiment, the complete contact of the mating surfaces ensures that the cotter pin 8 is subjected to uniform force at its tail, avoiding bending or deformation of the cotter pin 8 due to excessive local force, thus ensuring the structural integrity and stopping function of the cotter pin 8. The uniformly increasing force application method further avoids damage to the parts caused by instantaneous impact force, improves assembly quality, and reduces rework and scrap costs caused by deformation of the cotter pin 8.

[0066] In one possible embodiment, in step S4, the clamp handle is loosened before adjusting the direction of the device, and the angle is adjusted only after the jaws are disengaged from the cotter pin 8, in order to prevent scratching the linkage ring.

[0067] Specifically, when adjusting the device direction in step S4, first loosen the clamp handle so that the left jaw 3 and the right jaw 4 are separated from the surface of the cotter pin 8, with the distance controlled at 2-3mm. Then rotate the device 180° around the axis of the cotter pin 8, ensuring that the jaws do not contact the surface of the linkage ring during the rotation.

[0068] In this embodiment, after loosening the clamp handle, the direction is adjusted to avoid friction and scratching between the clamp jaws and the cotter pin 8 and the surface of the linkage ring, effectively preventing scratches and marks on the surface of the linkage ring and protecting the appearance and structural precision of precision parts such as the linkage ring; clear spacing control and rotation method ensure standardized operation, reduce the risk of damage to parts caused by human error, and improve the safety of the assembly process and the part qualification rate.

[0069] In one possible embodiment, after the cotter pin 8 is locked on both sides, check the stop status of the cotter pin 8 to ensure that the cotter pin 8 is not loose or deformed, and that the surface of the linkage ring is not scratched.

[0070] Specifically, after locking, visually inspect the cotter pin 8 for bending or cracks, and gently pry the cotter pin 8 by hand to confirm that it is not loose; use a surface roughness tester to check the surface of the linkage ring to ensure that the surface roughness Ra is not greater than 1.6μm and there are no obvious scratches or indentations.

[0071] In this embodiment, the stopping state of the cotter pin 8 is quickly verified by visual inspection and tactile confirmation, avoiding the use of loose or deformed cotter pins 8 and ensuring the reliability of the adjustment mechanism; surface roughness detection further ensures the surface quality of the linkage ring, which meets the assembly requirements of precision parts of aero-engines, reduces subsequent assembly problems caused by surface defects of parts, and improves the overall assembly quality and service life of the compressor stator assembly.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cotter pin stop positioning press-fit locking device, characterized in that, Includes left jaw (2), right jaw (1), left jaw (3), right jaw (4) and fasteners; The left pliers handle (2) and the left jaw (3) are connected by a fastener, the right pliers handle (1) and the right jaw (4) are connected by a fastener, and the left pliers handle (2) and the right jaw (4) are hinged by a fastener. The force-applying surface of the right jaw (4) is provided with a groove for stopping the head of the cotter pin (8); The width of the left jaw (3) is adapted to the width of the linkage ring, and is used to limit the locking process of the tail of the cotter pin (8).

2. The cotter pin stop positioning press-fit locking device according to claim 1, characterized in that, The inner wall of the slot of the right jaw (4) is a circular arc transition structure, and the radius of the circular arc is adapted to the head radius of the cotter pin (8).

3. The cotter pin stop positioning press-fit locking device according to claim 1, characterized in that, The working ends of the left jaw (3) and right jaw (4) are made of high-hardness alloy material, and the working end surfaces are polished.

4. The cotter pin stop positioning press-fit locking device according to claim 1, characterized in that, The outer surfaces of the left clamp handle (2) and the right clamp handle (1) are covered with anti-slip rubber sleeves, and the surface of the anti-slip rubber sleeves is provided with anti-slip texture.

5. The cotter pin stop positioning press-fit locking device according to claim 1, characterized in that, The fastener is made of corrosion-resistant material and has a protective structure on its surface.

6. A method for locking and positioning with a cotter pin, characterized in that, The cotter pin stop positioning press-fit locking device according to any one of claims 1-5 includes the following steps: S1: Insert the cotter pin (8) into the linkage ring pin hole and stop the linkage ring blade (9) pin through the cotter pin (8); S2: Insert the head of the cotter pin (8) into the groove of the right jaw (4) to axially limit and radially stop the cotter pin (8) through the groove; S3: Press the left jaw (3) against the tail of the cotter pin (8), and lock the cotter pin (8) onto the linkage ring by applying force to the left jaw handle (2) and the right jaw handle (1); S4: Adjust the device orientation and repeat steps S2 and S3 to complete the locking of the other side of the cotter pin (8).

7. The cotter pin stop positioning press-fit locking method according to claim 6, characterized in that, In step S1, after the cotter pin (8) is inserted into the pin hole, it is necessary to check the fit between the cotter pin (8) and the pin hole to ensure that the cotter pin (8) is not loose in the pin hole.

8. The cotter pin stop positioning press-fit locking method according to claim 6, characterized in that, In step S3, when applying force, keep the left jaw (3) in complete contact with the tail of the cotter pin (8) to avoid localized force causing deformation of the cotter pin (8).

9. The cotter pin stop positioning press-fit locking method according to claim 6, characterized in that, In step S4, before adjusting the direction of the device, loosen the clamp handle and wait for the jaws to disengage from the cotter pin (8) before adjusting the angle to prevent scratching the linkage ring.

10. The cotter pin stop positioning press-fit locking method according to claim 6, characterized in that, After locking the tails on both sides of the cotter pin (8), check the stop status of the cotter pin (8) to ensure that the cotter pin (8) is not loose or deformed, and that the surface of the linkage ring is not scratched.

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