Cotter pin installation tool and method

Abstract

The invention relates to the technical field of electric power overhaul tools, in particular to a cotter pin installation tool and method.The cotter pin installation tool comprises a connecting rod, a limiting pipe, a pin storage device, a first elastic reset piece and a second elastic reset piece, and a through hole is formed in the center of the connecting rod and comprises a connecting section, a limiting section, a sliding section and a fixed section which are sequentially communicated from left to right; the section of the fixed section is in a regular hexagon shape. The structure is reasonable and compact, the lower end of the cotter pin enables the lower side of the switch plate to abut against the outer side of the upper portion of the limiting pipe under the action of the second elastic reset piece, so that the limiting pipe, the switch plate and the connecting rod can synchronously rotate, or a left-right through sliding groove is formed in the outer side of the upper portion of the limiting pipe corresponding to the position of the limiting groove; the lower portion of the switch plate is slidably mounted in the sliding groove, the switch plate can be in a U shape with a downward opening, in this way, the limiting pipe slides left and right on the inner side of the switch plate, the movement distance of the limiting pipe is prevented from being too large, and in order to rapidly communicate the communicating hole of the switch plate with the upper mounting hole, the communicating hole is a notch with a rightward opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power maintenance tools, and is an open pin installation tool and method. BACKGROUND

[0002] An open pin is a mechanical part processed from high-quality steel, which is widely distributed in various machinery and power places as a fixing device for connecting power transmission and transformation line fittings, and is an important element for ensuring various high-voltage power facilities and mechanical facilities. However, the open pin is prone to deformation and falling off due to being exposed to rain, wind sand and other harsh outdoor environments for many years. Currently, open pin defects account for more than 60% of the total defect library of power transmission lines. To eliminate such defects, a great deal of effort is consumed by maintenance personnel.

[0003] Traditional mechanical open pin replacement devices mainly rely on manpower to fix the open pin on a rod device for installation, which has problems such as inconvenience to carry, limitation by tower angle, and easy falling off during installation. The installation process greatly depends on personnel experience and physical strength. At the same time, due to the limitation of high-altitude operation and narrow live working space, once the physical strength is insufficient or the safety distance is insufficient during operation, the life safety of the operator will be threatened. SUMMARY

[0004] The present application provides an open pin installation tool and method, which overcomes the shortcomings of the prior art and effectively solves the problems of low utilization rate and poor economic benefit of existing boilers.

[0005] One of the technical solutions of the present application is implemented through the following measures: an open pin installation tool and method, comprising a connecting rod, a limiting tube, a pin storage device, a first elastic return member and a second elastic return member. The connecting rod is provided with a through hole, and the through hole comprises a connecting section, a limiting section, a sliding section and a fixed section which are sequentially connected from left to right. The cross section of the fixed section is a regular hexagon. The limiting tube is sleeved in the sliding section. The upper and lower installation holes are symmetrically distributed on the outer side of the limiting tube. The limiting groove with an opening to the right is arranged on the inner side of the upper part of the sliding section corresponding to the position of the upper installation hole. The switch plate is slidably installed in the limiting groove. The right end of the switch plate is located to the right of the limiting tube. The first elastic return member is arranged between the left end of the switch plate and the left part of the sliding section. The communication hole penetrating upward and downward is arranged on the upper side of the switch plate corresponding to the right position of the upper installation hole. The feeding hole is arranged on the outer side of the connecting rod corresponding to the position of the feeding hole. The pin storage device for storing open pins is fixedly installed on the outer side of the connecting rod corresponding to the position of the feeding hole. The second elastic return member is arranged in the pin storage device for pushing the open pins in the pin storage device inward and passing through the upper installation hole and the lower installation hole.

[0006] The following is a further optimization or / and improvement of one of the above-mentioned technical solutions: The cross sections of the limiting section and the sliding section can both be circular, and the inner diameter of the limiting section is smaller than that of the sliding section.

[0007] The right side of the upper mounting hole and the right side of the lower mounting hole can extend to the right end of the limiting tube.

[0008] The outer side of the limiting tube corresponding to the left side of the lower mounting hole can be fixed with a guide plate, which is arc-shaped with the opening facing upward. The right part of the upper end of the guide plate is fixed with a guide head inside the left part of the lower mounting hole. The guide head is conical with the upper end being smaller than the lower end.

[0009] The pin storage device can include a storage tube and a sealing cover. The lower end of the storage tube is fixedly installed in the feed hole. The upper end of the storage tube is screwed with the sealing cover. The upper end of the second elastic return member is fixedly installed with the lower end of the sealing cover.

[0010] The second technical solution of the present application is realized by the following measures: an open pin installation method, including the following steps: Step one, open the sealing cover, install the open pin in the storage tube, and screw the sealing cover on the upper end of the storage tube; Step two, tighten the sealing cover, so that the straight foot end of the open pin abuts against the upper side of the switch plate; Step three, connect the connecting rod with the dismounting tool, and put the fixed section of the connecting rod outside the nut of the screw rod to be repaired, and the head of the screw rod is inside the right part of the limiting tube; Step four, press and rotate the connecting rod through the dismounting tool. After the connecting rod is rotated, the nut is tightened; Step five, when the connecting rod is pressed, the right end of the switch plate moves to the left, the communication hole on the switch plate is communicated with the upper mounting hole, and the straight foot end of the open pin abuts against the outer side of the screw rod after passing through the upper mounting hole; Step six, rotate the connecting rod, when the pin hole on the outer side of the screw rod corresponds to the upper mounting hole, the straight foot end of the open pin is pressed by the second elastic return member and passes through the lower mounting hole; Step seven, the straight foot end of the open pin is separated by the guide head and is bent; Step eight, move the connecting rod to the left through the dismounting tool, and the open pin is separated from the limiting tube after exiting from the upper mounting hole and the lower mounting hole.

[0011] The structure of the present application is reasonable and compact. The lower end of the open pin is pressed by the second elastic return member, so that the lower side of the switch plate abuts against the outer side of the upper part of the limiting tube. In this way, the limiting tube, the switch plate and the connecting rod can rotate synchronously. Alternatively, the outer side of the upper part of the limiting tube corresponding to the position of the limiting groove is provided with a left-right through sliding groove, and the lower part of the switch plate is slidingly installed in the sliding groove. The switch plate can be V-shaped with the opening facing downward. In this way, the limiting tube slides left and right inside the switch plate, avoiding the movement distance of the limiting tube being too large. In order to quickly correspond the communication hole of the switch plate with the upper mounting hole, the communication hole is a notch with the opening facing right.

[0012] In use, the split pin is placed in the storage, the upper end of the split pin abuts against the second elastic reset member, the lower end of the split pin abuts against the upper side of the switch plate, at this time the communication hole of the switch plate and the upper mounting hole are mutually dislocated, then the fixed section of the connecting rod is sleeved outside the nut of the to-be-repaired pin screw, the end surface of the nut abuts against the right side of the switch plate, after the switch plate is moved to the left, the communication hole and the upper mounting hole are mutually corresponding and communicated, the lower end of the split pin abuts against the outside of the screw after passing through the communication hole and the upper mounting hole under the action of the second elastic reset member, then the connecting rod is rotated through the dismounting tool, after the connecting rod is rotated, on one hand, the nut is fastened, on the other hand, the end of the split pin is rotated outside the screw along with the limiting tube, when the upper mounting hole and the pin hole on the screw are mutually corresponding and communicated, the lower end of the split pin is located in the lower mounting hole after passing through the pin hole under the action of the second elastic reset member, then the connecting rod is pulled out, the limiting tube and the screw are mutually dislocated, and the end of the split pin can be bent, so that the split pin is quickly installed. BRIEF DESCRIPTION OF DRAWINGS

[0013] FIG. 1 is a schematic diagram of the front view of the structure of the embodiment one of the present application. Figure 1 FIG. 2 is a schematic diagram of the right view of the structure of the embodiment one of the present application.

[0014] FIG. 3 is a schematic diagram of the top view of the structure of the limiting tube in the embodiment one of the present application. Figure 2 FIG. 4 is a schematic diagram of the front view of the structure of the embodiment two of the present application.

[0015] FIG. 5 is a schematic diagram of the front view of the structure of the embodiment three of the present application. Figure 3 FIG. 6 is a schematic diagram of the front view of the structure of the embodiment four of the present application.

[0016] FIG. 7 is a schematic diagram of the front view of the structure of the embodiment five of the present application. Figure 4 FIG. 8 is a schematic diagram of the front view of the structure of the embodiment one of the present application in use.

[0017] FIG. 9 is a schematic diagram of the enlarged structure of A in the embodiment one of the present application. Figure 5 FIG. 10 is a schematic diagram of the enlarged structure of B in the embodiment one of the present application. Figure 4 FIG. 11 is a schematic diagram of the enlarged structure of C in the embodiment one of the present application.

[0018] FIG. 12 is a schematic diagram of the enlarged structure of D in the embodiment one of the present application. Figure 6 FIG. 13 is a schematic diagram of the enlarged structure of E in the embodiment one of the present application. Figure 4 FIG. 14 is a schematic diagram of the sectional enlarged structure of the guide plate in the embodiment one of the present application.

[0019] The codes in the drawings are as follows: 1 is the connecting rod, 2 is the limiting tube, 3 is the first elastic reset member, 4 is the second elastic reset member, 5 is the connecting section, 6 is the limiting section, 7 is the sliding section, 8 is the fixed section, 9 is the upper mounting hole, 10 is the lower mounting hole, 11 is the switch plate, 12 is the communication hole, 13 is the guide plate, 14 is the guide head, 15 is the storage tube, 16 is the sealing cover, 17 is the split pin, 18 is the screw, 19 is the nut, and 20 is the guide groove. DETAILED DESCRIPTION

[0020] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical solutions of the present application and the actual situation.

[0021] In the present application, the relative position relationship of each component is described according to the layout direction of the drawings attached to the specification, such as the position relationship of front, back, up, down, left, right, etc. Figure 1 Figure 1

[0022] The present application will be further described below in conjunction with the examples and drawings: Example 1: as shown in the drawings attached Figure 1 , 2 , the open pin installation tool includes a connecting rod 1, a limiting tube 2, a pin storage device, a first elastic return member 3 and a second elastic return member 4, the connecting rod 1 is centrally provided with a through hole, the through hole includes a connecting section 5, a limiting section 6, a sliding section 7 and a fixed section 8 which are sequentially connected from left to right, the fixed section 8 is in the shape of a regular hexagon, the sliding section 7 is sleeved with the limiting tube 2, the outer side of the limiting tube 2 is symmetrically provided with an upper mounting hole 9 and a lower mounting hole 10, the upper side of the sliding section 7 corresponding to the position of the upper mounting hole 9 is provided with a limiting groove which is open to the right, the limiting groove is slidably provided with a switch plate 11, the right end of the switch plate 11 is located to the right of the limiting tube 2, the first elastic return member 3 is provided between the left end of the switch plate 11 and the left part of the sliding section 7, the upper side of the switch plate 11 corresponding to the right position of the upper mounting hole 9 is provided with a through hole 12 which is open upward and downward, the outer side of the connecting rod 1 corresponding to the position of the upper mounting hole 9 is provided with a feed hole which is connected between the inside and the outside, the outer side of the connecting rod 1 corresponding to the position of the feed hole is fixedly provided with a pin storage device for storing an open pin 17, the pin storage device is internally provided with a second elastic return member 4 for pushing the open pin 17 in the pin storage device inward and then through the upper mounting hole 9 and the lower mounting hole 10.

[0023] According to the requirements, the first elastic return member 3 and the second elastic return member 4 are both existing known technologies, such as cylindrical compression springs, in order to prevent the limiting tube 2 from rotating during the installation of the open pin 17, the lower end of the open pin 17 is under the action of the second elastic return member 4 to make the lower side of the switch plate 11 abut against the upper outer side of the limiting tube 2, so that the limiting tube 2, the switch plate 11 and the connecting rod 1 can rotate synchronously, or the upper outer side of the limiting tube 2 corresponding to the position of the limiting groove is provided with a sliding groove which is open left and right, the upper mounting hole 9 is provided on the bottom wall of the sliding groove, the lower part of the switch plate 11 is slidably installed in the sliding groove, the switch plate 11 can be in the shape of a V which is open downward, so that the limiting tube 2 slides left and right in the inner side of the switch plate 11, avoiding the movement distance of the limiting tube 2 being too large, in order to quickly correspond the through hole 12 of the switch plate 11 with the upper mounting hole 9, the through hole 12 is a gap which is open to the right, in order to quickly connect the connecting section 5 with the dismounting tool, the connecting section 5 can be a square hole or a regular hexagonal hole.

[0024] ​​In use, place the cotter pin 17 inside the pin reservoir. The upper end of the cotter pin 17 abuts against the second elastic reset member 4, and the lower end of the cotter pin 17 abuts against the upper side of the switch plate 11. At this time, the connecting hole 12 of the switch plate 11 is misaligned with the upper mounting hole 9. Then, the fixing section 8 of the connecting rod 1 is fitted onto the outside of the nut 19 of the screw 18 to be replaced. Using existing disassembly and assembly tools, such as a socket wrench or electric wrench, tighten the connecting rod 1. After the end face of the nut 19 abuts against the right side of the switch plate 11, the switch plate 11 moves to the left so that the connecting hole 12 and the upper mounting hole 9 are correspondingly connected. The lower end of the cotter pin 17, under the action of the second elastic reset member 4... After passing through the connecting hole 12 and the upper mounting hole 9, the connecting rod 1 abuts against the outside of the screw 18. Then, the connecting rod 1 is rotated by the disassembly and assembly tool. After the connecting rod 1 rotates, it can tighten the nut 19 on the one hand, and on the other hand, the end of the cotter pin 17 rotates outside the screw 18 with the limiting tube 2. When the upper mounting hole 9 and the pin hole on the screw 18 are connected to each other, the lower end of the cotter pin 17 continues to pass through the pin hole under the action of the second elastic reset member 4 and is located in the lower mounting hole 10. Then, the connecting rod 1 is pulled outward. After the limiting tube 2 and the screw 18 are misaligned, the end of the cotter pin 17 can be bent, thereby realizing the quick installation of the cotter pin 17.

[0025] The above-mentioned cotter pin installation tools can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 4, the cross-sections of both the limiting section 6 and the sliding section 7 are circular, and the inner diameter of the limiting section 6 is smaller than the inner diameter of the sliding section 7.

[0026] During use, this configuration facilitates the installation of the first elastic reset member 3 and the limiting tube 2. The left end of the first elastic reset member 3 is in contact with the stepped surface between the limiting section 6 and the sliding section 7, and the right end of the first elastic reset member 3 is in contact with the left side of the switch plate 11.

[0027] Example 3: As an optimization of the above examples, as shown in the appendix. Figures 1 to 4 As shown, the right side of the upper mounting hole 9 and the right side of the lower mounting hole 10 both extend to the right end of the limiting tube 2.

[0028] Both the upper mounting hole 9 and the lower mounting hole 10 extend to the right end of the limiting tube 2, meaning that both the upper mounting hole 9 and the lower mounting hole 10 are notches opening to the right. The left side wall of the connecting hole 12 is located to the right of the left side wall of the upper mounting hole 9. During use, this design allows the cotter pin 17 to be inserted into the pin hole of the screw 18. When the cotter pin installation tool is pulled out to the left, both ends of the cotter pin 17 can separate from the limiting tube 2 along the upper mounting hole 9 and the lower mounting hole 10, facilitating the disassembly of the cotter pin installation tool after installation.

[0029] Figure 4 shows the embodiment of the application as an optimization of the above-mentioned embodiments, in which the guide plate 13 is provided with a right-angled arc shape, and the guide head 14 is provided with a right-angled arc shape. Figure 1 , 2 , 4, 5, 6, the guide plate 13 is fixed outside the limiting tube 2 corresponding to the left position of the lower mounting hole 10, the guide plate 13 is provided with an arc shape with an upward opening, the guide head 14 is fixed at the upper end of the right part of the guide plate 13 and located inside the left part of the lower mounting hole 10, and the guide head 14 is provided with a tapered shape with a small upper end and a large lower end.

[0030] In use, through the setting of the guide head 14, after the straight foot end of the split pin 17 moves downward, the two straight feet of the split pin 17 are separated by the guide head 14 under the action of the second elastic reset member 4, and the straight foot on the left side is bent to the left along the guide plate 13. In order to facilitate the separation of the two straight feet of the split pin 17 from the split pin installation tool, the guide plate 13 is provided with a V-shaped shape with a high middle and low front and back, that is, the guide plate 13 is provided with a V-shaped shape after being bent at the front and back, or an arc shape, so that one of the straight feet of the split pin 17 can drive the split pin 17 to rotate when sliding along the front side or the back side of the guide plate 13, or one of the straight feet of the split pin 17 can drive the split pin 17 to rotate along the front side or the back side of the guide plate 13 when the split pin installation tool is disassembled, so that the two straight feet of the split pin 17 can pass through the guide head 14, thereby achieving smooth disassembly of the split pin installation tool. The guide plate 13 is provided with an arc shape with an upward opening, and the lower end of the guide plate 13 abuts against the inner wall of the sliding section 7, so as to limit and support the limiting tube 2, and to enable the limiting tube 2 and the connecting rod 1 to rotate synchronously.

[0031] Alternatively, the inner wall of the lower part of the sliding section 7 corresponding to the position of the guide plate 13 is provided with a guide groove 20 with a right opening, and the lower part of the guide plate 13 is slidingly installed in the guide groove 20, so as to enable the limiting tube 2 and the connecting rod 1 to rotate synchronously.

[0032] Figure 4 shows the embodiment of the application as an optimization of the above-mentioned embodiments, in which the guide plate 13 is provided with a right-angled arc shape, and the guide head 14 is provided with a right-angled arc shape. Figure 1 , 2 , 4, the split pin storage device includes a storage tube 15 and a sealing cover 16, the lower end of the storage tube 15 is fixedly installed in the feeding hole, the upper end of the storage tube 15 is screwed with the sealing cover 16, and the upper end of the second elastic reset member 4 is fixedly installed together with the lower end of the sealing cover 16.

[0033] In use, by rotating the sealing cover 16, the compression degree between the second elastic reset member 4 and the upper end of the split pin 17 can be adjusted, so as to ensure that the split pin 17 can be separated by the guide head 14 after passing through the pin hole of the screw rod 18, thereby achieving rapid installation of the split pin 17.

[0034] Figure 4 shows the embodiment of the application as an optimization of the above-mentioned embodiments, in which the guide plate 13 is provided with a right-angled arc shape, and the guide head 14 is provided with a right-angled arc shape. Figures 1 to 6 The split pin installation method includes the following steps: Step one, open the sealing cover 16, install the open pin 17 in the storage tube 15, screw the sealing cover 16 on the upper end of the storage tube 15; Step two, tighten the sealing cover 16, so that the straight foot end of the open pin 17 abuts against the upper side of the switch plate 11; Step three, connect the connecting section 5 with the dismounting tool, put the fixing section 8 of the connecting rod 1 outside the nut 19 of the screw rod 18 to be repaired, and the head of the screw rod 18 is located inside the right part of the limiting tube 2; Step four, press and rotate the connecting rod 1 through the dismounting tool, and the connecting rod 1 is tightened after being rotated; Step five, when the connecting rod 1 is pressed, the right end of the switch plate 11 moves to the left, the communication hole 12 on the switch plate 11 communicates with the upper mounting hole 9, and the straight foot end of the open pin 17 abuts against the outside of the screw rod 18 after passing through the upper mounting hole 9; Step six, rotate the connecting rod 1, when the pin hole on the outside of the screw rod 18 corresponds to the upper mounting hole 9, the straight foot end of the open pin 17 is pressed by the second elastic reset member 4 and passes through the lower mounting hole 10; Step seven, the straight foot end of the open pin 17 is separated by the guide head 14 and is bent; Step eight, move the connecting rod 1 to the left through the dismounting tool, and the open pin 17 exits from the upper mounting hole 9 and the lower mounting hole 10 and is separated from the limiting tube 2.

[0035] After the end face of the nut 19 abuts against the right side of the switch plate 11, the switch plate 11 moves to the left to make the communication hole 12 correspond to the upper mounting hole 9, the lower end of the open pin 17 abuts against the outside of the screw rod 18 after passing through the communication hole 12 and the upper mounting hole 9 under the action of the second elastic reset member 4, then rotate the connecting rod 1 through the dismounting tool, on the one hand, the connecting rod 1 is tightened after being rotated, on the other hand, the end of the open pin 17 rotates with the limiting tube 2 outside the screw rod 18, when the upper mounting hole 9 and the pin hole on the screw rod 18 correspond to each other, the lower end of the open pin 17 continues to pass through the pin hole under the action of the second elastic reset member 4 and is located in the lower mounting hole 10, the straight foot end of the open pin 17 is bent after being separated by the guide head 14, then pull out the connecting rod 1, the straight foot of the open pin 17 is rotated along the guide plate 13, so that the guide head 14 passes through the middle of the two straight feet of the open pin 17, and finally the open pin 17 is separated from the open pin installation tool.

[0036] The above technical features respectively constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A cotter pin installation tool characterized by The utility model provides a kind of connecting rod, limiting pipe, storage pin, first elastic reset piece and second elastic reset piece, connecting rod central is equipped with through-hole, through-hole includes from left to right sequentially communicated connecting section, limiting section, sliding section and fixed section, the section of fixed section is regular hexagon, sliding section is equipped with limiting pipe, limiting pipe outside symmetric distribution upper installation hole and lower installation hole, corresponding upper installation hole position sliding section upper inside is equipped with the right opening limiting slot, limiting slot is slidably installed with switch board, switch board right end is located in the right of limiting pipe, first elastic reset piece is arranged between switch board left end and sliding section left part, corresponding upper installation hole right position switch board upper side is equipped with the upper and lower through hole, corresponding upper installation hole position connecting rod outside is equipped with the inlet hole of internal and external communication, corresponding inlet hole position connecting rod outside is fixedly installed with the storage pin for storing open pin of storage pin, storage pin is equipped with the second elastic reset piece for being pushed into the open pin in storage pin inwards and passing through upper installation hole and lower installation hole.

2. The cotter pin installation tool of claim 1, wherein The section of limiting section and sliding section is circular, and the inner diameter of limiting section is smaller than that of sliding section.

3. The cotter pin installation tool of claim 1 or 2, wherein The right side of upper installation hole and the right side of lower installation hole extend to the right end of limiting pipe.

4. The cotter pin installation tool of claim 1 or 2, wherein The outer side of limiting pipe corresponding to the left side of lower installation hole is fixed with a guide plate, the guide plate is arc-shaped with an opening upward, the right part of guide plate is fixed with a guide head on the upper end, and the guide head is tapered with a small upper end and a large lower end.

5. The cotter pin installation tool of claim 3 wherein The outer side of limiting pipe corresponding to the left side of lower installation hole is fixed with a guide plate, the guide plate is arc-shaped with an opening upward, the right part of guide plate is fixed with a guide head on the upper end, and the guide head is tapered with a small upper end and a large lower end.

6. The cotter pin installation tool of claim 1 or 2 or 5, wherein The storage pin comprises a storage tube and a sealing cover, the lower end of the storage tube is fixedly installed in the inlet hole, the upper end of the storage tube is screwed with the sealing cover, and the upper end of the second elastic reset piece is fixedly installed with the lower end of the sealing cover.

7. The cotter pin installation tool of claim 3 wherein The storage pin comprises a storage tube and a sealing cover, the lower end of the storage tube is fixedly installed in the inlet hole, the upper end of the storage tube is screwed with the sealing cover, and the upper end of the second elastic reset piece is fixedly installed with the lower end of the sealing cover.

8. The cotter pin installation tool of claim 4, wherein The storage pin comprises a storage tube and a sealing cover, the lower end of the storage tube is fixedly installed in the inlet hole, the upper end of the storage tube is screwed with the sealing cover, and the upper end of the second elastic reset piece is fixedly installed with the lower end of the sealing cover.

9. A method of installing a cotter pin using the cotter pin installation tool according to any one of claims 6 to 8, characterized by The steps are as follows: Step one, open the sealing cover, install the open pin in the storage tube, and screw the sealing cover on the upper end of the storage tube; Step two, tighten the sealing cover, so that the straight foot end of the open pin abuts against the upper side of the switch plate; Step three, connect the connecting section with the dismounting tool, put the fixed section of the connecting rod outside the nut of the screw rod to be repaired, and the head of the screw rod is located in the right part of the limiting pipe; Step four, press and rotate the connecting rod through the dismounting tool, and tighten the nut after the connecting rod is rotated; Step five, when the connecting rod is pressed, the right end of the switch plate moves to the left, the communication hole on the switch plate is communicated with the upper installation hole, and the straight foot end of the open pin abuts against the outside of the screw rod after passing through the upper installation hole; Step six, rotate the connecting rod, when the pin hole on the outside of the screw rod corresponds to the upper installation hole, the straight foot end of the open pin is pressed by the second elastic reset piece and passes through the lower installation hole; Step seven, the straight foot end of the open pin is separated by the guide head and is bent. Step eight, by disassembling the tool with the connecting rod to the left, the split pin from the upper mounting hole and the lower mounting hole after the exit and the limit tube from each other.

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