A splitting cotter pin device and method

Abstract

This invention discloses a device and method for splitting cotter pins. A fixed wrench has a groove containing a positioning shaft. An arc-shaped recess is located on the end side of the fixed wrench, with an opening communicating with the groove. A cotter pin is placed in the groove, and the positioning shaft passes through the inner hole of the cotter pin. The opening allows a first and a second cotter pin to extend out. The arc-shaped recess abuts against the peripheral wall of the connecting pin shaft. A tightening wrench has a first limiting slot and a first notch at its end. The tail of the first cotter pin extends into the first limiting slot, and the tail of the second cotter pin is located in the first notch. The tightening wrench rotates away from the second cotter pin to split the cotter pin. A limiting seat is connected to the fixed wrench and has an angle marking area. The limiting seat abuts against the tightening wrench to limit the rotation angle of the tightening wrench. An angle indicator is connected to the limiting seat and displays the rotation angle of the tightening wrench. This invention effectively avoids damage to the cotter pin, controls the splitting angle, and reduces workload and time.

Description

Technical Field

[0001] This invention relates to the field of installation tool technology, and in particular to a splitting cotter pin device and method. Background Technology

[0002] Cotter pins, commonly used anti-loosening safety parts in the field of mechanical assembly, are widely used in the anti-loosening and locking processes of various pins and fasteners. They are key standard parts that ensure the reliability of mechanical structure connections and operational safety. In the conventional assembly process of cotter pins, after the cotter pin is inserted and positioned, its tail needs to be split and bent to make it fit against the workpiece surface to form an anti-loosening structure, thereby achieving long-term locking of the fastener.

[0003] Currently, the industry standard for splitting cotter pins generally employs a purely manual method using simple tools. The specific procedure involves the worker holding a hammer and chisel, striking the end of the chisel with the hammer to split the cotter pin into its final shape using the impact force. This traditional method relies on manual control of force and angle, lacking specialized tooling for positioning and force application, resulting in low efficiency and the following problems: On the one hand, the instantaneous impact force generated by the hammer is difficult to control, and local stress concentration is prone to occur at the contact point between the chisel and the cotter pin. This can easily cause structural damage such as scratches, bending deformation, tail cracking, or even breakage of the cotter pin, increasing assembly costs and material waste. On the other hand, during manual operation, the splitting angle relies entirely on the operator's experience for control, without a unified positioning benchmark or angle constraint. This can easily lead to problems such as splitting angles that are too large or too small, or asymmetry on both sides. This cannot meet the precision requirements of the assembly process for the cotter pin bending angle, thus affecting the reliability of the fastener's anti-loosening mechanism and creating potential safety hazards in mechanical operation.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In view of the problems pointed out in the background art, the present invention proposes a device and method for splitting cotter pins, which can effectively control the damage to cotter pins during the splitting process, effectively control the angle of splitting cotter pins, and reduce the workload and operation time.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a split cotter pin device is provided. The cotter pin includes a pin head, a first pin rod, and a second pin rod. The length of the first pin rod is greater than the length of the second pin rod. The cotter pin passes through a connecting pin shaft. The split cotter pin device includes: A fixed wrench has a groove, a positioning shaft is disposed in the groove, and an arc-shaped recess is disposed on the end side of the fixed wrench. An opening communicating with the groove is provided on the arc-shaped recess. The groove is configured to place the pin head, the positioning shaft is configured to pass through the inner hole of the pin head to position the pin head, the opening is configured to allow the first pin and the second pin to extend out, and the arc-shaped recess is configured to abut against the peripheral wall of the connecting pin shaft. A fastening wrench, wherein the end of the fastening wrench is provided with a first limiting slot and a first notch, the tail of the first pin extends into the first limiting slot, the tail of the second pin is located in the first notch, and the fastening wrench is configured to rotate in a direction away from the second pin to drive the first pin away from the second pin in order to split the cotter pin; A limiting seat is connected to the fixed wrench. The limiting seat is provided with an angle marking area. The limiting seat is configured to abut against the fastening wrench to limit the rotation angle of the fastening wrench. An angle indicator needle is connected to the limit seat and is configured to cooperate with the angle marking area to display the rotation angle of the tightening wrench.

[0007] In some embodiments of this application, the fixed wrench includes a wrench body and a wrench handle. The wrench body is fixedly disposed at the end of the wrench handle, and the wrench body is symmetrically provided with the groove and the arc-shaped recess on the left and right sides.

[0008] In some embodiments of this application, the main body of the wrench is provided with a first mounting hole, which passes through the wall surrounding the arc-shaped recess. The limiting seat is provided with a second mounting hole, which is an elongated hole. A connecting member passes through the first mounting hole and the second mounting hole to fix the limiting seat to the main body of the wrench.

[0009] In some embodiments of this application, the upper surface of the limiting seat is provided with the angle marking area, and the angle indicator is configured to rotate relative to the limiting seat to adjust the indicating angle of the angle indicator.

[0010] In some embodiments of this application, the angle indicator includes an indicator protrusion and an indicator extension, wherein the indicator protrusion is configured to point to the angle scale line within the angle marking area; The end of the limiting seat is provided with a cylindrical body, the upper surface of the cylindrical body is provided with the angle marking area, the center line of the indicator extension is tangent to the outer circle of the cylindrical body, and the tail of the indicator extension points to the bending position of the first pin.

[0011] In some embodiments of this application, the angle range of the angle marking area is 20-90 degrees.

[0012] In some embodiments of this application, a method for splitting cotter pins is provided, using the cotter pin splitting device described above, the method comprising: According to the required splitting angle of the cotter pin, first adjust the angle indicator to the required angle position, and then fix the angle indicator to the limiting seat; Fix the limiting seat to the fixing wrench, and adjust the position of the limiting seat so that the tail of the indicator extension of the angle indicator needle points to the bent position of the first pin. The fixing wrench is reversed and fastened to the head of the cotter pin, the positioning shaft passes through the positioning hole of the head of the pin, and the arc-shaped groove abuts against the peripheral wall of the connecting pin. Insert the tightening wrench into the position to be split on the cotter pin, insert the first pin into the first limiting slot, and place the second pin in the first notch. Rotate the tightening wrench toward the limiting seat to move the first pin away from the second pin, thereby splitting the cotter pin. The tightening wrench abuts against the cylindrical body of the limiting seat, splitting the cotter pin to the desired angle.

[0013] In some embodiments of this application, the fixing wrench is symmetrically provided with the groove and the arc-shaped recess, so that the tightening wrench can be operated clockwise or counterclockwise.

[0014] In some embodiments of this application, the fixing wrench and the tightening wrench operate in the same plane.

[0015] In some embodiments of this application, the fixed wrench remains in a fixed position during operation, and the cotter pin splitting operation is performed by rotating the tightening wrench in the same plane as the fixed wrench.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: The cotter pin splitting device disclosed in this application positions the cotter pin head through a positioning shaft, and achieves stable clamping of the cotter pin by using a fixed wrench to abut and limit the contact of the connecting pin shaft. It replaces hammering with the method of splitting by rotating the tightening wrench, eliminating instantaneous impact stress and fundamentally avoiding structural damage such as scratches, deformation, and breakage of the cotter pin, thereby reducing the scrap rate of parts.

[0017] By utilizing a limit seat to restrict the rotational stroke of the tightening wrench, combined with the coordination of the angle indicator and the angle marking area, the splitting angle of the cotter pin can be visualized and adjusted. The positions of the limit seat and the angle indicator can be pre-adjusted according to assembly requirements to ensure a uniform splitting angle, solving the problems of uncontrolled angle and asymmetry on both sides in traditional manual operation, and improving the reliability of fastener anti-loosening.

[0018] The lever-operated structure, which uses a wrench, simplifies the work process and reduces manual labor intensity. A single operation is sufficient to split the cotter pin, shortening the operation time per station.

[0019] By directionally splitting the first and second pins, which are of different lengths, and using a fixed wrench to position the connecting pin shaft, it is ensured that the cotter pin fits tightly against the workpiece after splitting, effectively preventing the cotter pin from falling off the connecting pin shaft.

[0020] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an operating state of a splitting cotter pin device according to some embodiments; Figure 2 for Figure 1 A top view; Figure 3 for Figure 2 Sectional view along line AA; Figure 4 This is a schematic diagram of another operating state of the split cotter pin device according to some embodiments; Figure 5 For Figure 4 Enlarged view of section B in the middle; Figure 6 A cross-sectional view of a cotter pin device and a cotter pin according to some embodiments; Figure 7 This is a structural diagram of a fixed wrench according to some embodiments; Figure 8 This is yet another structural diagram of a fixed wrench according to some embodiments; Figure 9 This is a structural diagram of a fastening wrench according to some embodiments; Figure 10 A cross-sectional view of a fastening wrench according to some embodiments; Figure 11 This is a structural diagram of a fixed wrench, a limit seat, and an angle indicator according to some embodiments; Figure 12 This is a structural diagram of a fixed wrench and cotter pin according to some embodiments; Figure 13 This is a structural diagram of an angle indicator needle according to some embodiments; Figure 14 This is a structural diagram of a limiting seat according to some embodiments; Figure 15 This is a structural diagram of a cotter pin according to some embodiments; Figure 16 This is a structural diagram of a cotter pin and a fastener according to some embodiments.

[0023] Figure label: 10. Cotter pin; 11. Pin head; 12. Inner hole; 13. First pin; 14. Second pin; 21. First fastener; 22. Second fastener; 23. Connecting pin; 100. Fixed wrench; 110. Wrench body; 111. Groove; 112. Positioning shaft; 113. Arc-shaped recess; 114. Opening; 115. First mounting hole; 120. Wrench handle; 200. Fastening wrench; 210. First limit slot; 220. First notch; 300, Limit seat; 310, Second mounting hole; 320, Angle marking area; 330, Column; 340, First shaft hole; 350, Bolt; 400, Angle indicator needle; 410, Indicator protrusion; 420, Indicator extension; 430, Second shaft hole; 510. Fixing pin; 520. Nut. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0026] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly 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 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 directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0030] Reference Figure 15 The cotter pin 10 includes a pin head 11, a first pin 13, and a second pin 14, all integrally formed. The length of the first pin 13 is greater than the length of the second pin 14. The cotter pin 10 is used to fasten and prevent loosening of the two components. (Refer to...) Figure 16 The two components to be fastened are designated as the first fastener 21 and the second fastener 22, respectively, and a connecting pin 23 passes between the two fasteners. A cotter pin 10 passes through one end of the connecting pin 23 to achieve a tight and secure fastening of the two fasteners.

[0031] This application provides a cotter pin splitting device for splitting cotter pins 10 to prevent cotter pins 10 from falling off the connecting pin 23. The cotter pin splitting device includes a fixed wrench 100, a tightening wrench 200, a limit seat 300, an angle indicator 400, etc. Figure 1 and Figure 2 This is a structural diagram of the split cotter pin device in its first working position. Figure 4 This is a structural diagram of a split cotter pin device in its second working position.

[0032] Figure 7 and Figure 8 This is a structural diagram of the fixed wrench 100 viewed from different sides. The fixed wrench 100 has a circular groove 111, within which a positioning shaft 112 is disposed. An arc-shaped recess 113 is provided on the end side of the fixed wrench 100, and an opening 114 communicating with the groove 111 is provided on the arc-shaped recess 113. (Refer to...) Figure 12 The groove 111 is configured to hold the pin 11, the positioning shaft 112 is configured to pass through the inner hole 12 of the pin 11 to position the pin 11, and the opening 114 is configured to allow the first pin 13 and the second pin 14 to extend out. (Refer to...) Figure 6 The arc-shaped recess 113 is configured to abut against the peripheral wall of the connecting pin 23.

[0033] Figure 9 This is a structural diagram of a tightening wrench 200. Figure 10 This is a cross-sectional view of a fastening wrench 200. The fastening wrench 200 is a long rod-shaped structure supported by a solid steel bar or a hollow steel tube. The end of the fastening wrench 200 is provided with a first limiting slot 210 and a first notch 220. (Refer to...) Figure 6 The tail of the first pin 13 extends into the first limiting slot 210, and the tail of the second pin 14 is located in the first notch 220. The tightening wrench 200 is configured to rotate away from the second pin 14 to move the first pin 13 away from the second pin 14, thereby splitting the cotter pin 10. That is, the tightening wrench 200 is... Figure 1 The first working position shown is towards Figure 4The second working position change shown is used to split the cotter pin 10.

[0034] Figure 14 This is a structural diagram of the limit seat 300. (Refer to...) Figure 11 The limiting seat 300 is connected to the fixed wrench 100. The limiting seat 300 is provided with an angle marking area 320. (See reference...) Figure 4 The limiting seat 300 is configured to abut against the tightening wrench 200 to limit the rotation angle of the tightening wrench 200. In other words, when the tightening wrench 200 rotates to abut against the limiting seat 300, the tightening wrench 200 is rotated into position, at which point the cotter pin 10 is split open.

[0035] Figure 13 This is a structural diagram of an angle indicator needle 400. (Refer to...) Figure 11 Angle indicator 400 is connected to limit seat 300. Angle indicator 400 is configured to cooperate with angle marking area 320 to display the rotation angle of fastening wrench 200. In other words, after fastening wrench 200 is rotated to the correct position, the rotation angle of fastening wrench 200 can be determined by angle indicator 400, and thus the splitting angle of cotter pin 10 can be determined.

[0036] Based on the required splitting angle of the cotter pin 10, the positions of the limit seat 300 and the angle indicator 400 are pre-adjusted, which allows the rotation angle of the tightening wrench 200 to be adjusted, thereby meeting the required splitting angle of the cotter pin 10.

[0037] The cotter pin splitting device disclosed in this application positions the pin head 11 through the positioning shaft 112, and cooperates with the fixed wrench 100 and the connecting pin shaft 23 to achieve stable clamping of the cotter pin 10; the method of splitting by rotating the tightening wrench 200 replaces the hammering, eliminating instantaneous impact stress, and fundamentally avoiding structural damage such as scratches, deformation, and breakage of the cotter pin 10, thereby reducing the scrap rate of parts.

[0038] By using a limit seat 300 to restrict the rotation stroke of the fastening wrench 200, and in conjunction with the angle indicator 400 and the angle marking area 320, the splitting angle of the cotter pin 10 can be visualized and adjusted. The positions of the limit seat 300 and the angle indicator 400 can be pre-adjusted according to assembly requirements to ensure a uniform splitting angle, solving the problems of uncontrolled angle and asymmetry on both sides in traditional manual operation, and improving the reliability of fastener anti-loosening.

[0039] The lever-type operating structure, which uses a wrench, simplifies the work process and reduces manual labor intensity. A single operation can complete the splitting of the cotter pin 10, shortening the single-station operation time.

[0040] By directionally splitting the first pin 13 and the second pin 14, which have different lengths, and using the fixed wrench 100 to position the connecting pin 23, it is ensured that the cotter pin 10 fits tightly against the workpiece after being split, effectively preventing the cotter pin 10 from falling off the connecting pin 23.

[0041] In some embodiments of this application, reference is made to Figure 7 and Figure 8 The fixed wrench 100 includes a wrench body 110 and a wrench handle 120, with the wrench body 110 fixedly disposed at the end of the wrench handle 120. The wrench body 110 and the wrench handle 120 are welded or otherwise fixedly connected. The wrench body 110 is a plate-like structure with a certain thickness. The wrench handle 120 is a rod structure with a certain length.

[0042] The wrench body 110 has symmetrically arranged grooves 111 and arc-shaped recesses 113 on its left and right sides. The two grooves 111 are located on the same side of the wrench body 110. The two arc-shaped recesses 113 are located at opposite ends of the wrench body 110. During operation, only one side is used, that is, the pin head 11 of the cotter pin 10 is placed in one of the grooves 111. This arrangement can adapt to different working environments, and the tightening wrench 200 can be operated clockwise or counterclockwise.

[0043] In some embodiments of this application, reference is made to Figure 7 and Figure 8 The wrench body 110 has a first mounting hole 115, which passes through the wall forming the arc-shaped recess 113. (See reference...) Figure 14 The limiting seat 300 is provided with a second mounting hole 310, which is an elongated hole that extends along the length of the limiting seat 300. A connecting piece (such as a bolt 350) is passed between the first mounting hole 115 and the second mounting hole 310 to fix the limiting seat 300 to the wrench body 110.

[0044] By setting the second mounting hole 310 as an elongated hole, the position of the limit seat 300 can be adjusted, as shown in the reference. Figure 4 Since the tightening wrench 200 abuts against the limit seat 300 after rotating to the position, the rotation angle of the tightening wrench 200 can be adjusted by adjusting the position of the limit seat 300, which in turn can adjust the splitting angle of the cotter pin 10.

[0045] In some embodiments of this application, reference is made to Figure 14 The upper surface of the limit seat 300 is provided with an angle marking area 320, the angle marking area 320 having an angle range of 20-90 degrees. The angle indicator needle 400 is configured to rotate relative to the limit seat 300 to adjust the indicating angle of the angle indicator needle 400.

[0046] Specifically, the limit seat 300 is provided with a first shaft hole 340, and then refer to... Figure 13 The angle indicator 400 has a second shaft hole 430. A fixing pin 510 passes between the first shaft hole 340 and the second shaft hole 430. The end of the fixing pin 510 is locked by a nut 520 to achieve a fixed connection between the angle indicator 400 and the limit seat 300. When it is necessary to adjust the indicated angle of the angle indicator 400, first loosen the nut 520, rotate the angle indicator 400 to the position, and then tighten the nut 520 again.

[0047] In some embodiments of this application, reference is made to Figure 13 The angle indicator 400 includes an integrally formed indicator protrusion 410 and an indicator extension 420, and the angle indicator 400 has a Z-shaped structure. (See reference...) Figure 5 The indicator protrusion 410 is configured to point to the angle scale line within the angle marking area 320.

[0048] Reference Figure 14 The end of the limiting seat 300 is provided with a cylindrical body 330, and the upper surface of the cylindrical body 330 is provided with an angle marking area 320. (Refer to...) Figure 5 and Figure 13 The center line (denoted as X) of the extension 420 is tangent to the outer circle of the cylinder 330, and the tail of the extension 420 points to the bent position of the first pin 13. This configuration ensures that the tightening wrench 200 is in its final state (i.e., Figure 4 The angle at the position shown is the actual angle of the angle indicator needle at 400.

[0049] In some embodiments of this application, a method for splitting cotter pins is provided, using the cotter pin splitting device described above. The cotter pin splitting method includes: According to the splitting angle requirement of the cotter pin 10, first adjust the angle indicator 400 to the required angle position, and then fix the angle indicator 400 to the limit seat 300. Fix the limit seat 300 to the fixed wrench 100, adjust the position of the limit seat 300 so that the tail of the indicator extension 420 of the angle indicator needle 400 points to the bent position of the first pin 13. The fixing wrench 100 is reversed and placed on the pin head 11 of the cotter pin 10. The positioning shaft 112 passes through the positioning hole of the pin head 11, and the arc-shaped groove 111 abuts against the peripheral wall of the connecting pin 23. Insert the tightening wrench 200 into the position to be split in the cotter pin 10. Insert the first pin 13 into the first limiting slot 210 and the second pin 14 into the first notch 220. By applying working force to the tightening wrench 200, the tightening wrench 200 is rotated toward the limiting seat 300, so as to drive the first pin 13 away from the second pin 14. By using the lever principle, the first pin 13 is bent at the bending position to split the cotter pin 10. The tightening wrench 200 is rotated until it abuts against the cylindrical body 330 of the limit seat 300, splitting the cotter pin 10 to the required angle.

[0050] In some embodiments of this application, the fixed wrench 100 is provided with grooves 111 and arc-shaped recesses 113 symmetrically arranged on the left and right sides, so that the tightening wrench 200 can be operated clockwise or counterclockwise.

[0051] In some embodiments of this application, the fixing wrench 100 and the tightening wrench 200 operate in the same plane.

[0052] In some embodiments of this application, the fixed wrench 100 remains in a fixed position during operation, and the cotter pin 10 is split by rotating the tightening wrench 200 in the same plane as the fixed wrench 100.

[0053] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cotter pin splitting device, wherein the cotter pin includes a pin head, a first pin shank, and a second pin shank, the length of the first pin shank being greater than the length of the second pin shank, and the cotter pin passing through a connecting pin shaft, characterized in that... The splitting cotter pin device includes: A fixed wrench has a groove, a positioning shaft is disposed in the groove, and an arc-shaped recess is disposed on the end side of the fixed wrench. An opening communicating with the groove is provided on the arc-shaped recess. The groove is configured to place the pin head, the positioning shaft is configured to pass through the inner hole of the pin head to position the pin head, the opening is configured to allow the first pin and the second pin to extend out, and the arc-shaped recess is configured to abut against the peripheral wall of the connecting pin shaft. A fastening wrench, wherein the end of the fastening wrench is provided with a first limiting slot and a first notch, the tail of the first pin extends into the first limiting slot, the tail of the second pin is located in the first notch, and the fastening wrench is configured to rotate in a direction away from the second pin to drive the first pin away from the second pin in order to split the cotter pin; A limiting seat is connected to the fixed wrench. The limiting seat is provided with an angle marking area. The limiting seat is configured to abut against the fastening wrench to limit the rotation angle of the fastening wrench. An angle indicator needle is connected to the limit seat and is configured to cooperate with the angle marking area to display the rotation angle of the tightening wrench.

2. The splitting cotter pin device according to claim 1, characterized in that, The fixed wrench includes a wrench body and a wrench handle. The wrench body is fixedly disposed at the end of the wrench handle. The wrench body is symmetrically provided with the groove and the arc-shaped recess on the left and right sides.

3. The splitting cotter pin device according to claim 2, characterized in that, The main body of the wrench is provided with a first mounting hole, which passes through the wall surrounding the arc-shaped recess. The limiting seat is provided with a second mounting hole, which is an elongated hole. A connecting piece passes through the first mounting hole and the second mounting hole to fix the limiting seat to the main body of the wrench.

4. The splitting cotter pin device according to claim 1, characterized in that, The upper surface of the limiting seat is provided with the angle marking area, and the angle indicator is configured to rotate relative to the limiting seat to adjust the indicating angle of the angle indicator.

5. The splitting cotter pin device according to claim 4, characterized in that, The angle indicator includes an indicator protrusion and an indicator extension, wherein the indicator protrusion is configured to point to the angle scale line within the angle marking area; The end of the limiting seat is provided with a cylindrical body, the upper surface of the cylindrical body is provided with the angle marking area, the center line of the indicator extension is tangent to the outer circle of the cylindrical body, and the tail of the indicator extension points to the bending position of the first pin.

6. The splitting cotter pin device according to any one of claims 1 to 5, characterized in that, The angle range of the angle marking area is 20-90 degrees.

7. A method for splitting cotter pins, characterized in that, The method of splitting a cotter pin, using the cotter pin splitting device as described in any one of claims 1 to 6, comprises: According to the required splitting angle of the cotter pin, first adjust the angle indicator to the required angle position, and then fix the angle indicator to the limiting seat; Fix the limiting seat to the fixing wrench, and adjust the position of the limiting seat so that the tail of the indicator extension of the angle indicator needle points to the bent position of the first pin. The fixing wrench is reversed and fastened to the head of the cotter pin, the positioning shaft passes through the positioning hole of the head of the pin, and the arc-shaped groove abuts against the peripheral wall of the connecting pin. Insert the fastening wrench into the position to be split on the cotter pin, insert the first pin into the first limiting slot, and place the second pin in the first notch. Rotate the fastening wrench toward the limiting seat to move the first pin away from the second pin, thereby splitting the cotter pin. The tightening wrench abuts against the cylindrical body of the limiting seat, splitting the cotter pin to the desired angle.

8. The method for splitting a cotter pin according to claim 7, characterized in that, The fixed wrench is symmetrically provided with the groove and the arc-shaped recess on the left and right sides, so that the tightening wrench can be operated clockwise or counterclockwise.

9. The method for splitting a cotter pin according to claim 7, characterized in that, The fixed wrench and the tightening wrench operate in the same plane.

10. The method for splitting a cotter pin according to claim 7, characterized in that, The fixed wrench remains in a fixed position during operation, and the cotter pin splitting operation is performed by rotating the tightening wrench in the same plane as the fixed wrench.

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