Installation tool for high-locking bolt and high-locking nut

Abstract

The invention relates to the technical field of aviation assembly, in particular to a mounting tool for a high-locking bolt and a high-locking nut. The mounting tool for the high-locking bolt and the high-locking nut comprises a barrel, a hexagonal sleeve used for being matched with the high-locking nut is rotationally assembled at one end of the barrel, a rotation stopping shaft used for being matched with a hexagonal groove in the end of the high-locking bolt is assembled in the barrel in a rotation stopping mode, and the inner end of the hexagonal sleeve is in transmission connection with a wrenching sleeve through a one-way transmission structure. The pulling and twisting sleeve is provided with a pulling and twisting arm, a hydraulic cylinder is further fixedly installed on the outer side of the barrel body, and the pulling and twisting arm is in transmission connection with the hydraulic cylinder and can be driven by the hydraulic cylinder to swing in a reciprocating mode. According to the mounting tool for the high-locking bolt and the high-locking nut, the high-locking nut is tightened through hydraulic transmission, higher tightening force can be provided, meanwhile, the high-locking bolt can be fixed and prevented from rotating under the condition that no external force is used, the mounting efficiency is high, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of aviation assembly, in particular to an installation tool for high-lock bolts and high-lock nuts. Background Art

[0002] Bolt connection is one of the most important connection methods in aircraft assembly and manufacturing. Bolt connection is widely used in many joints on aircraft with high stress. Bolt connections on aircraft are usually connected with high-lock bolts and high-lock nuts. Commonly used high-lock bolts usually have a hexagonal hole at the tail end. During installation, the external anti-rotation shaft is inserted into the hexagonal hole of the high-lock bolt to prevent the high-lock bolt from rotating during installation. Commonly used high-lock nuts usually consist of a process section and a working section, with a diameter-breaking groove provided between the two. When installing high-lock bolts and high-lock nuts, the purpose of fixed torque installation is achieved by twisting off the diameter-breaking groove, thereby keeping the preload force of the bolt connection within a controllable range.

[0003] With the development of aerospace technology, in order to meet the requirements of weight reduction and high-reliability connection of new large-scale equipment, large-scale, high-strength, high-locking bolts and high-locking nuts are usually used when connecting joints with large stresses. The installation torque of large-scale, high-strength, high-locking bolts and high-locking nuts is greatly increased. During installation, due to the lack of special installation tools, the installation process is cumbersome and inefficient. When using ordinary torque wrenches to manually apply tightening force for installation, 3-5 workers are required. The labor intensity is high and the installation efficiency is low. It is very difficult to install in a small space. At the same time, there are safety hazards during installation. When the high-locking nut is twisted off, the tool will fall out and there will be a risk of injuring parts or workers. Therefore, a special installation tool is needed to install large-scale, high-strength, high-locking bolts and high-locking nuts.

[0004] Currently, most commonly used installation tools for high-lock bolts and high-lock nuts are pneumatic tools. For example, a Chinese invention patent application with application publication number CN118024181A and application publication date May 14, 2024 discloses an installation tool for high-lock bolts and high-lock nuts. The installation tool includes an air trigger, a sleeve, a core rod and a spring connecting pin. The air trigger is provided with a threaded hole, one end of the sleeve is provided with an external thread, and the other end is provided with an internal hexagonal hole that cooperates with the hexagonal end of the high-lock nut. The sleeve is connected to the air trigger through the external threaded end, and one end of the core rod is provided with a hexagonal head that cooperates with the high-lock nut, and the other end is provided with a radial through hole. The spring connecting pin passes through the radial through hole and is connected to the air trigger. The installation tool drives the sleeve and the high-lock nut to rotate synchronously by rotating the air trigger to achieve the installation of the high-lock nut and the high-lock bolt. The core rod and the high-lock nut rotate synchronously. During the rotation process, a reaction force is applied to the core rod by the spring connecting pin to prevent the core rod from breaking. The installation tool does not have a structure for fixing the high-locking bolt. When in use, the high-locking bolt needs to be fixed with external force to prevent it from rotating. Summary of the Invention

[0005] The object of the present invention is to provide an installation tool for a high-locking bolt and a high-locking nut, so as to solve the problem that the existing installation tool needs to use external force to fix the high-locking bolt to prevent the high-locking bolt from rotating.

[0006] To achieve the above objectives, the installation tool for high-lock bolts and high-lock nuts of the present invention adopts the following technical solutions: The installation tool for high-locking bolts and high-locking nuts includes a cylinder, one end of which is rotatably equipped with a hexagonal sleeve for cooperating with the high-locking nut, and a stop shaft is anti-rotatably equipped in the cylinder for cooperating with the hexagonal groove at the end of the high-locking bolt. The inner end of the hexagonal sleeve is connected to a wrench sleeve through a one-way transmission structure, and the wrench sleeve is equipped with a wrench arm. A hydraulic cylinder is also fixedly installed on the outside of the cylinder, and the wrench arm is transmission-connected to the hydraulic cylinder and can swing back and forth under the drive of the hydraulic cylinder.

[0007] Furthermore, a rotation-stopping block is provided in the cylinder body for stopping rotation relative to the cylinder body, and a one-way rotation-stopping structure is provided between the rotation-stopping block and the inner end of the rotation-stopping shaft.

[0008] Furthermore, the stop block is movably matched with the sleeve along the axial direction of the sleeve and is rotationally matched with the sleeve along the circumference of the sleeve. A stop block spring is installed between the end of the stop block away from the stop shaft and the cylinder body.

[0009] Furthermore, the wrench sleeve is an external gear sleeve, and the wrench arm is provided with an internal gear ring engaged with the external gear sleeve, and the wrench sleeve and the internal gear ring are movably matched along the axial direction of the cylinder.

[0010] Furthermore, a sleeve spring is mounted on the top of one end of the wrench sleeve facing away from the hexagonal sleeve.

[0011] Furthermore, an inner stop is provided at one end of the wrench sleeve away from the hexagonal sleeve, and the sleeve spring cooperates with the inner stop.

[0012] Furthermore, a radial groove is provided on the piston of the hydraulic cylinder between two ends, and the wrench arm extends into the radial groove.

[0013] Furthermore, piston bosses are respectively provided on both sides of the radial groove, and the handle of the wrench arm is located between the piston bosses.

[0014] Furthermore, the one-way transmission structure includes helical teeth provided at the end of the hexagonal sleeve and helical teeth provided at the end of the wrench sleeve.

[0015] Furthermore, the one-way anti-rotation structure includes helical teeth provided at the end of the anti-rotation shaft and helical teeth provided at the end of the anti-rotation block.

[0016] Beneficial Effects: The present invention's high-lock bolt and high-lock nut installation tool is a groundbreaking invention. Under the action of a hydraulic cylinder, the wrench arm of the present invention drives the wrench sleeve to swing back and forth. The wrench sleeve and the hexagonal sleeve transmit one-way transmission, achieving a one-way tightening operation on the high-lock nut. Using a hydraulic cylinder as a driving force can increase the tightening force. The anti-rotation shaft cooperates with the hexagonal hole at the rear of the high-lock bolt, securing the high-lock bolt without external force and preventing the high-lock bolt from rotating during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a tool for installing a high-lock bolt and a high-lock nut according to the present invention; Figure 2 for Figure 1 A schematic diagram of the cooperation between the cylinder and the hydraulic cylinder of the embodiment; Figure 3 for Figure 2 sectional view of Figure 4 for Figure 2 A top view of Figure 5 for Figure 1 A schematic structural diagram of a wrench arm according to an embodiment; Figure 6 for Figure 5 Cross-sectional view of the wrench arm; Figure 7 for Figure 5 Top view of the wrench arm; Figure 8 for Figure 1 A schematic structural diagram of a piston of an embodiment; Figure 9 for Figure 8 a cross-sectional view of the piston; Figure 10 Schematic diagram of the cooperation between the wrench arm and the piston; Figure 11 for Figure 1 A schematic structural diagram of a wrench sleeve according to an embodiment; Figure 12 for Figure 11 Cross-sectional view of the wrench sleeve; Figure 13 for Figure 11 Right side view of the wrench sleeve; Figure 14 for Figure 1 A schematic structural diagram of a hexagonal sleeve in an embodiment; Figure 15 for Figure 14 Rear view of the hexagonal sleeve; Figure 16 for Figure 14Cross-sectional view of the hexagonal sleeve; Figure 17 It is a structural diagram of the drive component; Figure 18 This is a schematic diagram of the structure of the drive assembly and the high lock nut; Figure 19 It is a structural diagram of the sensor fixing seat; Figure 20 for Figure 19 Front view of the sensor mount; Figure 21 for Figure 19 A cross-sectional view of the sensor mount; Figure 22 This is a structural diagram of the sensor mounting base; Figure 23 for Figure 22 A cross-sectional view of the sensor mount; Figure 24 for Figure 22 Right side view of the sensor mount; Figure 25 A schematic diagram of the structure of the anti-rotation block; Figure 26 for Figure 25 A cross-sectional view of the anti-rotation block; Figure 27 for Figure 25 The main view of the anti-rotation block; Figure 28 A schematic diagram of the structure of the anti-rotation shaft; Figure 29 for Figure 28 Right side view of the anti-rotation shaft; Figure 30 Schematic diagram of the structure of the reaction arm assembly; Figure 31 It is a structural diagram of the reaction arm assembly and the high-lock bolt; Figure 32 for Figure 1 A top view of an embodiment; Figure 33 It is a structural diagram of a high locking bolt; Figure 34 It is a structural diagram of a high lock nut; Figure 35 This is a schematic diagram of the structure after the high-lock bolts and high-lock nuts are installed.

[0018] In the figure: 1. Cylinder; 2. Hydraulic cylinder; 3. Piston; 4. Radial groove; 5. Tightening arm; 6. Tightening sleeve; 7. Hexagonal sleeve; 8. Sensor mounting seat; 9. Sensor fixing seat; 10. Stop block; 11. Stop shaft; 12. Hexagonal head; 13. Stop block spring; 14. Sleeve spring; 15. Piston boss; 16. Sensor interface; 17. Rotary joint; 18. High-lock bolt; 19. High-lock nut. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0020] The installation tool for high-locking bolts and high-locking nuts of the present invention is hydraulically driven to provide a higher tightening force for the installation of high-locking bolts and high-locking nuts. A stop shaft that cooperates with the hexagonal hole of the high-locking bolt is arranged in the cylinder body to prevent the high-locking bolt from rotating during installation without the aid of external force. While meeting the installation torque of large-specification and high-strength high-locking bolts and high-locking nuts, it can also be used for the installation of other small and medium-sized high-locking bolts and high-locking nuts.

[0021] like Figure 1-4 As shown, in a basic embodiment, the installation tool is composed of a cylinder 1 and a hydraulic cylinder 2. A drive assembly and a reaction arm assembly are installed in the cylinder 1. The drive assembly is as shown in FIG. Figure 17 、 18 As shown, a piston 3 is installed in the hydraulic cylinder 2, and the wrench arm 5 includes a head and a handle. The head of the wrench arm 5 is provided with an inner hole, and the wrench sleeve 6 is installed in the inner hole of the head of the wrench arm 5. A hexagonal sleeve 7 is connected to the bottom of the wrench sleeve 6. There is one-way transmission between the wrench sleeve 6 and the hexagonal sleeve 7. The wrench arm 6 is transmission-connected to the hydraulic cylinder 2 and can swing back and forth under the drive of the hydraulic cylinder 2, thereby driving the wrench sleeve 6 to rotate back and forth. When the wrench sleeve 6 rotates clockwise, the wrench sleeve 6 can transfer the motion and load to the hexagonal sleeve 7, thereby achieving the effect of tightening the high lock nut; when the wrench sleeve 6 rotates counterclockwise, the end face one-way bevel gears of the wrench sleeve 6 and the hexagonal sleeve 7 slide out from their inclined surfaces, so that the two are disengaged. At this time, the wrench sleeve 6 no longer transfers the motion and load to the hexagonal sleeve 7, thereby achieving one-way transmission. A stop shaft 11 is installed in the cylinder, and the stop shaft and the cylinder form a reaction arm assembly. A hexagonal head 12 is provided at the lower end of the stop shaft. The hexagonal head 12 can cooperate with the hexagonal hole of the high-locking bolt to prevent the high-locking bolt from rotating during installation and provide a reaction force.

[0022] In a preferred embodiment, a stop block 10 is provided on the stop shaft 11, and the stop block 10 and the stop shaft 11 are engaged in a one-way anti-rotation manner. When engaging with the hexagonal hole of the high-locking bolt, the stop shaft 11 can be rotated to facilitate alignment between the hexagonal head and the hexagonal hole of the high-locking bolt; in other embodiments, the stop shaft 11 and the stop block 10 can be an integrated structure, and when the hexagonal head and the hexagonal hole are aligned, they can be aligned by rotating the high-locking bolt.

[0023] In a preferred embodiment, Figure 25-27 As shown, the stop block 10 is movably matched with the cylinder body 1 along the axial direction of the cylinder body 1, which can play a guiding role and prevent the stop block 10 from tilting; the stop block 10 is matched with the cylinder body 1 along the circumference of the cylinder body 1 to stop rotation, and a stop block spring 13 is installed between the stop block 10 and the cylinder body 1. The stop block spring 13 is top-mounted in the cylinder body 1. The stop block spring 13 can make the stop shaft 11 float up and down axially, which is convenient for the stop shaft 11 to be aligned and smoothly matched with the hexagonal hole of the high locking bolt 18.

[0024] In other embodiments, the stop block 10 can be engaged with the cylinder body through gears to play a positioning and guiding role. A spring can be set between the upper end surface of the stop block 10 and the end cover of the cylinder body 1 so that the stop shaft 11 can float up and down, making it easier for the stop shaft 11 to be aligned with the hexagonal hole of the high-locking bolt 18 and to fit smoothly.

[0025] like Figure 30 、 31 As shown, a sensor mounting seat 8 is also provided above the wrench sleeve 6. The sensor mounting seat 8 is as shown in FIG. Figure 22-24 As shown, the sensor mounting seat 8 is fixedly connected to the sensor fixing seat 9, and the sensor fixing seat 9 is fixedly installed in the cylinder 1. The sensor mounting seat 8 and the sensor fixing seat 9 are both cylindrical structures with a through hole in the middle. The stop block 10 and the stop shaft 11 are both installed in the sensor mounting seat 8 and the sensor fixing seat 9. An internal gear is provided in the sensor mounting seat 8, and an external gear is provided on the outer circumference of the stop block 10. The sensor mounting seat 8 and the stop block 10 are engaged with each other through gears to achieve the anti-rotation fit. During installation, the high-locking bolt 18 is fixed by the fit among the stop shaft 11, the stop block 10, the sensor mounting seat 8, and the sensor fixing seat 9, to provide a reverse torque for tightening the high-locking lock nut and to offset the impact at the moment when the high-locking nut 19 is screwed off; in other embodiments, the stop block and the stop shaft can be directly installed in the cylinder.

[0026] like Figure 19-21As shown, an internal gear is provided at the upper end of the cylinder 1, and a spur gear is provided on the outer circle of the upper end of the sensor fixing seat 9. The spur gear is engaged with the internal gear on the cylinder 1 to fix the sensor fixing seat 9 and prevent the sensor fixing seat 9 from rotating. At the same time, the use of gear meshing fixation can facilitate the installation and disassembly of the sensor fixing seat 9; in other embodiments, the sensor fixing seat 9 can be directly welded to the inner wall of the cylinder 1, which can fix the sensor fixing seat 9 and prevent the sensor fixing seat 9 from rotating. A torque sensor in the form of a strain gauge is installed on the sensor fixing seat 9, and the torque sensor can be used to collect the reaction torque of the reaction arm assembly.

[0027] The sensor fixing seat 9 and the sensor mounting seat 8 are connected by a flange. An internal threaded hole and a light hole are provided on the flange. The internal threaded hole cooperates with the screw, and the light hole cooperates with the cylindrical pin. The sensor fixing seat 9 and the sensor mounting seat 8 are connected and positioned by the screw and the cylindrical pin. At the same time, the flange connection can facilitate the installation and disassembly between the sensor fixing seat 9 and the sensor mounting seat 8; in other embodiments, the sensor fixing seat 9 and the sensor mounting seat 8 can be welded together, or they can be directly processed into an integrated structure.

[0028] In a preferred embodiment, an inner stop is provided in the wrench sleeve 6, and a sleeve spring 14 is installed in the inner stop. The sleeve spring 14 is mounted on the top of the cylinder 1. The sleeve spring 14 can make the hexagonal sleeve 7 float up and down in the axial direction, so that the hexagonal sleeve 7 and the hexagonal end of the high lock nut 19 are aligned and matched smoothly during installation, and the hexagonal sleeve can move downward synchronously with the high lock nut; in other embodiments, no spring may be provided between the wrench sleeve 6 and the sensor mounting seat 8, and it does not affect the one-way tightening of the high lock nut 19 by the hexagonal sleeve 7 under the drive of the wrench arm 5 and the wrench sleeve 6.

[0029] In a preferred embodiment, Figure 8 、 9 As shown, a radial groove 4 is opened in the middle of the piston 3, and both ends of the piston 3 are in sliding sealing cooperation with the hydraulic cylinder 2, as shown in FIG. Figure 5-7 As shown, the wrench arm 5 consists of a handle and a head. Figure 10 As shown, the handle cooperates with the radial groove 4 of the piston 3, and piston bosses 15 are provided on both sides of the radial groove 4 on the piston 3. The handle of the wrench arm 5 cooperates with the piston bosses 15 on both sides, which can reduce the wear of the wrench arm 5 on the piston 3 during movement and extend the service life of the piston 3; in other embodiments, the wrench arm 5 can be in direct contact with the piston 3, and the piston 3 can be replaced regularly during use to ensure the installation quality of the high-locking bolt 18 and the high-locking nut 19.

[0030] In a preferred embodiment, Figure 11-16As shown, the lower end face of the wrench sleeve 6 is provided with a one-way bevel gear, and the upper end face of the hexagonal sleeve 7 is provided with a one-way bevel gear. The wrench sleeve 6 and the hexagonal sleeve 7 are engaged with the one-way bevel gears on their end faces to realize one-way transmission. The lower end of the hexagonal sleeve 7 cooperates with the high lock nut 19 to play the role of wrench the high lock nut 19.

[0031] In a preferred embodiment, a one-way helical gear is provided on the lower end surface of the stop block 10, and a stop shaft 11 is provided below the stop block 10. Figure 28 、 29 As shown, a one-way bevel gear is provided on the upper end face of the stop shaft 11, and the stop block 10 and the stop shaft 11 are engaged through the one-way bevel gear on their end faces to achieve a one-way stop fit between the stop block 10 and the stop shaft 11, and a hexagonal head 12 is provided at the lower end of the stop shaft 11, which can cooperate with the hexagonal hole at the tail end of the high-locking bolt 18 to prevent the high-locking bolt 18 from rotating during installation.

[0032] like Figure 32 As shown, a rotary joint 17 is provided on the hydraulic cylinder 2, and a hydraulic pipe interface is provided on the rotary joint 17. The hydraulic pipe interface is connected to the hydraulic pump, and high-pressure hydraulic oil is introduced into the hydraulic cylinder 2 to drive the piston 3 to move. The rotary joint 17 can rotate 360°, which is convenient for adjusting the direction of the oil pipe during use; in other embodiments, the hydraulic pump can be directly connected to the hydraulic cylinder 2 through the oil pipe, and high-pressure hydraulic oil can be introduced into the hydraulic cylinder 2 to drive the piston 3 to move.

[0033] The working principle of the installation tool for high-lock bolts and high-lock nuts of the present invention is as follows: like Figures 33-35As shown, align the hexagonal sleeve 7 on the installation tool with the hexagonal end of the high lock nut 19 and put it on the high lock nut 19, insert the hexagonal head 12 of the anti-rotation shaft 11 into the hexagonal hole at the tail of the high lock bolt 18, start the hydraulic pump, and the hydraulic oil is transmitted to the hydraulic cylinder 2 through the oil pipe under the action of the motor power. The hydraulic oil pushes the piston 3 to make a linear reciprocating motion, and the piston 3 drives the wrench arm 5 to swing back and forth. The internal gear of the wrench arm 5 and the external gear of the wrench sleeve 6 are meshed to transmit motion and load. The wrench sleeve 6 is meshed with the one-way bevel gear on the lower end face thereof and the one-way bevel gear on the upper end face of the hexagonal sleeve 7 to provide a one-way tightening force for the high lock nut 19, thereby realizing a one-way tightening operation on the high lock nut 19 until the high lock nut 19 is tightened. The hexagonal end of the stop shaft 11 is screwed off; the stop shaft 11 is meshed with the one-way bevel gear on the lower end face of the stop block 10 through the one-way bevel gear on the upper end face, and the stop block 10 and the sensor mounting seat 8 are engaged by gears to prevent the stop block 10 from rotating. The sensor mounting seat 8 is fixedly connected to the sensor fixing seat 9, and the sensor fixing seat 9 is fixedly installed in the cylinder 1 to prevent the sensor mounting seat 8 and the sensor fixing seat 9 from rotating. Through the cooperation between the stop shaft 11, the stop block 10, the sensor mounting seat 8 and the sensor fixing seat 9, the high lock bolt 18 is prevented from rotating during the installation process and the counter torque is transmitted upward to the cylinder 1, thereby offsetting the impact of the high lock nut 19 at the moment of screwing off, ensuring safety during the installation process. When selecting a hydraulic pump, in order to match the process of tightening torque from being small in the initial stage to increasing as the friction between the high lock nut and the connector increases, the hydraulic pump needs to be able to provide low pressure and large flow in the early stage and high pressure and small flow in the later stage. Fast tightening in the early stage improves efficiency, and slow tightening in the subsequent stage improves torque acquisition accuracy. Usually, an electric plunger hydraulic pump is selected. The electric plunger hydraulic pump is driven by a servo motor. When the pressure approaches the target pressure, the motor speed is reduced to achieve the effect of precise control of pressure accuracy.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A high-lock bolt and high-lock nut installation tool, characterized in that: It includes a cylinder body, one end of which is rotatably equipped with a hexagonal sleeve for cooperating with a high-locking nut, and a stop shaft is anti-rotatably equipped in the cylinder body for cooperating with a hexagonal groove at the end of a high-locking bolt. The inner end of the hexagonal sleeve is transmission-connected with a wrench sleeve through a one-way transmission structure, and the wrench sleeve is equipped with a wrench arm. A hydraulic cylinder is also fixedly installed on the outside of the cylinder body, and the wrench arm is transmission-connected with the hydraulic cylinder and can swing back and forth under the drive of the hydraulic cylinder.

2. The installation tool for high-lock bolts and high-lock nuts according to claim 1, characterized in that: A rotation-stopping block is arranged in the cylinder body for stopping rotation relative to the cylinder body, and a one-way rotation-stopping structure is arranged between the rotation-stopping block and the inner end of the rotation-stopping shaft.

3. The installation tool for high-lock bolts and high-lock nuts according to claim 2, characterized in that: The anti-rotation block is movably matched with the cylinder along the axial direction of the cylinder and anti-rotated with the cylinder along the circumferential direction of the cylinder. A anti-rotation block spring is installed between the cylinder and one end of the anti-rotation block away from the anti-rotation shaft.

4. The installation tool for high-lock bolts and high-lock nuts according to any one of claims 1 to 3, characterized in that: The wrench sleeve is an outer gear sleeve, and the wrench arm is provided with an inner gear ring meshing with the outer gear sleeve. The wrench sleeve and the inner gear ring are movably matched along the axial direction of the cylinder.

5. The installation tool for high-lock bolts and high-lock nuts according to claim 4, characterized in that: A sleeve spring is mounted on the top of one end of the wrench sleeve facing away from the hexagonal sleeve.

6. The installation tool for high-lock bolts and high-lock nuts according to claim 5, characterized in that: An inner stop is arranged at one end of the wrench sleeve away from the hexagonal sleeve, and the sleeve spring cooperates with the inner stop.

7. The installation tool for high-lock bolts and high-lock nuts according to any one of claims 1 to 3, characterized in that: A radial groove is arranged between two ends of the piston of the hydraulic cylinder, and the wrench arm extends into the radial groove.

8. The installation tool for high-lock bolts and high-lock nuts according to claim 7, characterized in that: Piston bosses are respectively arranged on both sides of the radial groove, and the handle of the wrench arm is located between the piston bosses.

9. The installation tool for high-lock bolts and high-lock nuts according to any one of claims 1 to 3, characterized in that: The one-way transmission structure comprises a helical tooth arranged at the end of the hexagonal sleeve and a helical tooth arranged at the end of the wrench sleeve.

10. The installation tool for high-lock bolts and high-lock nuts according to claim 2 or 3, characterized in that: The one-way anti-rotation structure comprises an oblique tooth arranged at the end of the anti-rotation shaft and an oblique tooth arranged at the end of the anti-rotation block.

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