A tool and method for installing a clearance fit high lock bolt assembly

Abstract

This invention discloses an installation tool and method for a clearance-fit high-strength bolt assembly, comprising: a winch, a sleeve, a core rod, and a spring connecting pin; the winch has a threaded hole, one end of the sleeve has an external thread, and the other end has an internal hexagonal hole. The sleeve is screwed onto the winch via its external thread end, and the internal hexagonal hole at its other end is used to fit onto the hexagonal end of a high-strength nut; the hexagonal end of the high-strength nut has a hexagonal groove at its center, one end of the core rod has a hexagonal boss at its central axis position, and the other end has a radially penetrating through hole. The core rod is entirely fitted inside the sleeve, and its hexagonal boss is inserted into the hexagonal groove of the high-strength nut; the spring connecting pin passes through the radial through hole at the other end of the core rod, and both ends of the spring connecting pin are fixedly connected to the winch. This invention solves the problem that existing high-strength bolt installation tools and methods are difficult to achieve the clearance-fit installation requirements between high-strength bolts and composite materials.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of electric system technology for distributed electric propulsion aircraft, and particularly to an installation tool and method for a clearance-fit high-lock bolt assembly. Background Technology

[0002] A large number of high-strength bolts were used as fasteners for connection during the aircraft assembly process.

[0003] For aircraft products involving composite materials, clearance-fit high-strength bolts are typically used in the design to ensure that the tightening force during installation does not damage the composite materials. Currently, most high-strength bolt installation tools do not differentiate between clearance fit and interference fit when assembling the bolt with the product. Common installation tools and methods only address interference fits between the high-strength bolt and the product, making it difficult to meet the installation requirements for clearance fits between the high-strength bolt and the composite material product. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides an installation tool and method for a clearance-fit high-strength bolt assembly, which addresses the problem that existing high-strength bolt installation tools and methods are insufficient for achieving the clearance fit between the high-strength bolt and the product composite material, especially when the installation method involves interference fit between the high-strength bolt and the product.

[0005] The technical solution of the present invention: The present invention provides an installation tool for a clearance fit high-lock bolt assembly. The high-lock bolt assembly to be installed by clearance fit screwing includes a high-lock nut 6 and a high-lock bolt 7. The installation tool includes: a wind wrench 1, a sleeve 2, a core rod 3 and a spring connecting pin 4.

[0006] The wind trigger 1 is provided with a threaded hole, one end of the sleeve 2 is provided with an external thread, and the other end is provided with an internal hexagonal hole. The sleeve 2 is screwed onto the wind trigger 1 through its external threaded end, and the internal hexagonal hole at its other end is used to fit onto the hexagonal end of the high-lock nut 6.

[0007] The high-lock nut 6 has a hexagonal groove at the center of its hexagonal end. The core rod 3 has a hexagonal boss at the central axis of one end and a radial through hole at the other end. The core rod 3 is fitted inside the sleeve 2, and its hexagonal boss is inserted into the hexagonal groove of the high-lock nut 6.

[0008] The spring connecting pin 4 passes through the radial through hole at the other end of the core rod 3, and both ends of the spring connecting pin 4 are fixedly connected to the wind trigger 1.

[0009] Optionally, in the installation tool of the clearance fit high-lock bolt assembly as described above,

[0010] The installation tool is used to apply tightening force by rotating the air wrench 1, driving the sleeve 2 and the high-lock nut 6 to rotate synchronously, thereby realizing the screw connection between the high-lock nut 6 and the high-lock bolt 7; wherein, during the screw connection installation process of the high-lock nut 6 and the high-lock bolt 7, it is also used to drive the core rod 3 to rotate synchronously with it by rotating the high-lock nut 6, and during the synchronous rotation of the core rod 3 and the high-lock nut 6, the spring connecting pin 4 applies a reverse force to the core rod 3, thereby preventing the core rod 3 from breaking during rotation.

[0011] Optionally, in the installation tool of the clearance fit high-lock bolt assembly as described above,

[0012] The torque applied by the wind wrench 1 is higher than the breaking torque of the high-lock nut 6 in the high-lock bolt assembly.

[0013] Optionally, in the installation tool of the clearance fit high-lock bolt assembly as described above: retainer 5;

[0014] The fixture 5 is configured as a U-shaped structure with connecting ends on both sides. Its U-shaped open end is completely covered on the end of the core rod 3 where the spring connecting pin 4 is located, and it is fixedly connected to the wind trigger 1 through the connecting ends on both sides; so that the inner end face of the fixture 5 presses against the end face of the core rod 3 to apply a downward force to the core rod 3.

[0015] Optionally, in the installation tool of the clearance fit high-lock bolt assembly as described above,

[0016] The high-lock nut 6 has a hexagonal end that is fitted to the sleeve 2, and the other end is an internal threaded connection end for connecting with the high-lock bolt 7. An annular fracture groove is provided circumferentially between the hexagonal end and the internal threaded connection end of the high-lock nut 6, so that the high-lock nut 6 will break under force during the installation of the high-lock nut 6 and the high-lock bolt 7 by screwing them together with an installation tool, thus completing the installation.

[0017] This invention also provides a method for installing a clearance-fit high-strength bolt assembly, wherein the high-strength bolt assembly with clearance fit to the product is installed using the installation tool for the clearance-fit high-strength bolt assembly as described in any of the above embodiments, and the installation method includes:

[0018] Step 1: Place the high-strength bolt 7 into the clearance-fit bolt hole on the product, and fit the internal threaded end of the high-strength nut 6 onto the threaded end of the high-strength bolt 7.

[0019] Step 2, install the high-lock nut 6 and the installation tool;

[0020] Step 3: Using the pneumatic wrench 1 as an installation tool, a tightening force is applied by rotation, which drives the sleeve 2 and the high-lock nut 6 to rotate synchronously, thereby screwing the high-lock nut 6 and the high-lock bolt 7 together.

[0021] Optionally, in the installation method of the clearance fit high-lock bolt assembly as described above, step 2 includes:

[0022] Step 21: Screw the wind trigger 1 to one end of the sleeve 2, and fit the inner hexagonal hole of the other end of the sleeve 2 onto the hexagonal end of the high-lock nut 6.

[0023] Step 22: Insert the core rod 3 into the sleeve 2 with one end having a hexagonal boss, so that the hexagonal boss is inserted into the hexagonal groove of the high-lock nut 6, and the other end of the core rod 3 extends out of the end face of the blower 1.

[0024] Step 23: Pass the spring connecting pin 4 through the radial through hole at the other end of the core rod 3, and fix both ends of the spring connecting pin 4 to the wind trigger 1.

[0025] Optionally, in the installation method of the clearance fit high-lock bolt assembly as described above, the installation tool further includes: a retainer 5; step 2 further includes:

[0026] Step 24: The retainer 5 is placed over the end of the core rod 3 with the spring connecting pin 4 at its U-shaped open end, and is fixedly connected to the wind trigger 1 through the connecting ends on both sides, with the inner end face of the retainer 5 pressing against the end face of the core rod 3.

[0027] Optionally, in the installation method of the clearance fit high-lock bolt assembly as described above,

[0028] In step 3, during the screw connection of the high-lock nut 6 and the high-lock bolt 7, the rotation of the high-lock nut 6 drives the core rod 3 to rotate synchronously with it. During the synchronous rotation of the core rod 3 and the high-lock nut 6, the spring connecting pin 4 applies a reverse force to the core rod 3 to prevent the core rod 3 from breaking during rotation.

[0029] The beneficial effects of this invention are as follows: This invention provides an installation tool and method for a clearance-fit high-lock bolt assembly. During the installation process, the tool applies a tightening force by rotating the air wrench 1, causing the sleeve 2 and the high-lock nut 6 to rotate synchronously, thus achieving a screw-on connection between the high-lock nut 6 and the high-lock bolt 7. Furthermore, during the screw-on connection, the core rod 3 rotates synchronously with the high-lock nut 6. When the core rod reaches a certain rotation point, a reverse force is applied to the core rod 3 via the spring connecting pin 4, preventing the core rod 3 from breaking during rotation. Clearly, the technical solution provided by this invention not only requires tightening force on the high-lock nut 6 but also requires a reverse force from the core rod 3 during installation. This solves the problem of the high-lock nut 6 breaking due to stress during installation and avoids tool damage. The installation tool provided by this invention replaces manual tools, offering high installation efficiency and simple operation; it can be used simply by pressing the switch of the air wrench 1.

[0030] Furthermore, the technical solution of this invention solves the bolt installation problem of high-lock bolts and product clearance fit during aircraft assembly. By controlling the tightening force and reaction force of the high-lock nut during installation, combined with the working principle of the pneumatic trigger, stable force can be achieved during the tightening and breakage process of the high-lock bolt, avoiding the tool breakage problem that occurs in other installation methods, improving installation efficiency and saving installation costs. Attached Figure Description

[0031] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0032] Figure 1 This is a schematic diagram of the installation tool and assembly structure of the clearance fit high-lock bolt assembly provided in an embodiment of the present invention.

[0033] Figure 2 for Figure 1 The top view of the installation tool for the clearance fit high-lock bolt assembly provided in the illustrated embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0035] As explained in the background section above, during aircraft assembly, for composite material products, in order to ensure that the tightening force during installation will not damage the composite material products, high-strength bolts with clearance fit are selected, that is, the high-strength bolts and the composite material products are required to have a clearance fit during installation.

[0036] Currently, the commonly used methods for installing high-strength bolts are manual installation and a fixed-force pneumatic wrench. These tools are suitable for situations where there is an interference fit between the high-strength bolt and the product, because the product can exert a reverse force on the bolt during the tightening process of the pneumatic wrench. However, for situations where there is a clearance fit between the bolt and the product, the product cannot exert a reverse force on the bolt, and therefore the bolt cannot exert a reverse force on the nut. With the mandrel fixed in a conventional pneumatic wrench, all the force is concentrated on the mandrel, which can easily lead to breakage. Manual installation tools are inefficient and also prone to breakage.

[0037] To address the aforementioned problems, this invention provides an installation tool and method for a clearance-fit high-lock bolt assembly. This invention, combined with the function of a fan motor, adds a sleeve, spring connecting pin, and retainer, solving the stress problem during nut installation, avoiding tool damage, and replacing manual tools. It offers high installation efficiency, simple operation, and can be used simply by pressing a switch.

[0038] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0039] Figure 1 This is a schematic diagram of the installation tool and assembly structure of the clearance fit high-lock bolt assembly provided in an embodiment of the present invention. Figure 2 for Figure 1 The top view of the installation tool for the clearance fit high-lock bolt assembly provided in the illustrated embodiment.

[0040] The installation tool for the clearance-fit high-strength bolt assembly provided in this embodiment of the invention is used to install the high-strength bolt assembly that has a clearance fit with the product; wherein, the high-strength bolt assembly includes a high-strength nut 6 and a high-strength bolt 7. It should be noted that the high-strength bolt 7 has a clearance fit with the bolt hole on the product; in addition, the installation of the high-strength bolt assembly is completed by the breakage of the high-strength nut 6 during the installation process.

[0041] Reference Figure 1 and Figure 2 As shown, the installation tool provided in this embodiment of the invention includes: a wind wrench 1, a sleeve 2, a core rod 3, and a spring connecting pin 4.

[0042] In this embodiment of the invention, the air wrench 1 is provided with a threaded hole, one end of the sleeve 2 is provided with an external thread, and the other end is provided with an internal hexagonal hole. The internal hexagonal hole is used to cooperate with the hexagonal end of the high-lock nut 6. The sleeve 2 is screwed onto the air wrench 1 through its external threaded end, and the internal hexagonal hole at its other end is used to fit onto the hexagonal end of the high-lock nut 6. During the installation process, the rotation of the air wrench 1 drives the sleeve 2 and the high-lock nut 6 to rotate synchronously, thereby realizing the screwed installation of the high-lock nut 6 and the high-lock bolt 7.

[0043] In this embodiment of the invention, a hexagonal groove is provided at the center of the hexagonal end of the high-lock nut 6, a hexagonal boss is provided at the central axis position of one end of the core rod 3, and a radially penetrating through hole is provided at the other end. The core rod 3 is completely fitted inside the sleeve 2, and its hexagonal boss is inserted into the hexagonal groove of the high-lock nut 6. Based on the mating assembly structure of the core rod 3 and the high-lock nut 6, the core rod 3 and the high-lock nut 6 can rotate synchronously when the high-lock nut 6 rotates.

[0044] In this embodiment of the invention, the spring connecting pin 4 passes through the radial through hole at the other end of the core rod 3, and both ends of the spring connecting pin 4 are fixedly connected to the air trigger 1. Based on the assembly structure of the core rod 3, the spring connecting pin 4 and the air trigger 1, it is possible to apply a reverse force to the core rod 3 through the spring connecting pin 4 during the synchronous rotation of the core rod 3 and the high-lock nut 6, thereby preventing the core rod 3 from breaking.

[0045] The working principle of the installation tool for the clearance fit high-lock bolt assembly provided in this embodiment of the invention is as follows:

[0046] The tightening force is applied by rotating the air wrench 1, which drives the sleeve 2 and the high-lock nut 6 to rotate synchronously, thereby realizing the screw connection between the high-lock nut 6 and the high-lock bolt 7. During the screw connection process between the high-lock nut 6 and the high-lock bolt 7, the rotation of the high-lock nut 6 also drives the core rod 3 to rotate synchronously with it. During the synchronous rotation of the core rod 3 and the high-lock nut 6, the spring connecting pin 4 applies a reverse force to the core rod 3, thereby preventing the core rod 3 from breaking during rotation.

[0047] It should be noted that during the installation of the clearance fit high-lock bolt assembly using the installation tool provided in this embodiment of the invention, the torque required to apply the tightening force by the air wrench 1 is higher than the breaking torque of the high-lock nut 6 in the high-lock bolt assembly.

[0048] In one implementation of this invention, the installation tool further includes: a retainer 5; such as Figure 1 and Figure 2 As shown.

[0049] In this implementation, the retainer 5 is configured as a U-shaped structure with connecting ends on both sides. Its U-shaped open end is completely covered on the end of the core rod 3 where the spring connecting pin 4 is located, and it is fixedly connected to the wind trigger 1 through the connecting ends on both sides. This causes the inner end face of the retainer 5 to press against the end face of the core rod 3, so as to apply a downward force to the core rod 3, causing the core rod 3 to rotate in conjunction with the high-lock nut 6.

[0050] It should be noted that, in order to facilitate the fracture-type installation of the high-lock nut 6, one end of the high-lock nut 6 has a hexagonal end that is fitted with the sleeve 2, and the other end is an internal threaded connection end for connecting with the high-lock bolt 7. An annular fracture groove is provided circumferentially between the hexagonal end and the internal threaded connection end of the high-lock nut 6, so that the high-lock nut 6 will break under force during the installation of the high-lock nut 6 and the high-lock bolt 7 by screwing them together with the installation tool, thus completing the installation.

[0051] For high-strength bolt assemblies with clearance fits, since the product itself is not subjected to stress during installation, all torsional forces are borne by the tool. This places high demands on the design of the installation tools. Existing installation tools are suitable for installing high-strength bolts with interference fits, but are prone to breakage when installing high-strength bolts with clearance fits. Manual installation tools, because the tightening force is concentrated on the hand tool, are also prone to breakage, and have low installation efficiency.

[0052] To address the above problems, this invention provides an installation tool for a clearance-fit high-lock bolt assembly. During the installation of the clearance-fit high-lock bolt assembly using this tool, on one hand, a tightening force is applied by rotating the air wrench 1, causing the sleeve 2 and the high-lock nut 6 to rotate synchronously, thus achieving the screw connection between the high-lock nut 6 and the high-lock bolt 7. On the other hand, during the screw connection process, since the core rod 3 rotates synchronously with the high-lock nut 6, a reverse force is applied to the core rod 3 through the spring connecting pin 4 when it reaches a certain rotation point, thereby preventing the core rod 3 from breaking during rotation. Clearly, the technical solution provided by this invention not only requires tightening force on the high-lock nut 6 but also requires the core rod 3 to apply a reverse force to the high-lock nut 6 during installation, thus solving the problem of the high-lock nut 6 breaking due to stress during installation and avoiding tool damage. The installation tool provided by this invention replaces manual tools, has high installation efficiency, and is simple to operate; it can be used simply by pressing the switch of the air wrench 1. Furthermore, it solves the problem of bolt installation where the high-lock bolts and the product clearance fit are properly matched during aircraft assembly. By controlling the tightening force and reaction force of the high-lock nut during installation, combined with the working principle of the pneumatic trigger, stable force can be achieved during the tightening and breakage process of the high-lock bolt, avoiding the tool breakage problem that occurs in other installation methods, improving installation efficiency and saving installation costs.

[0053] Based on the installation tool for the clearance-fit high-lock bolt assembly provided in the embodiments of the present invention, the embodiments of the present invention also provide an installation method for the clearance-fit high-lock bolt assembly. The installation method involves using the installation tool provided in any of the above embodiments to install the high-lock bolt assembly that has a clearance fit with the product. The installation method includes the following steps:

[0054] Step 1: Place the high-strength bolt 7 into the clearance-fit bolt hole on the product, and fit the internal threaded end of the high-strength nut 6 onto the threaded end of the high-strength bolt 7.

[0055] In this step, the high-strength bolt 7 and the bolt hole on the product are in a clearance fit relationship, such as... Figure 1 As shown.

[0056] Step 2, install the high-lock nut 6 and the installation tool;

[0057] The installation methods in this step include:

[0058] Step 21: Screw the wind trigger 1 to one end of the sleeve 2, and fit the inner hexagonal hole of the other end of the sleeve 2 onto the hexagonal end of the high-lock nut 6.

[0059] Step 22: Insert the core rod 3 into the sleeve 2 with one end having a hexagonal boss, so that the hexagonal boss is inserted into the hexagonal groove of the high-lock nut 6, and the other end of the core rod 3 extends out of the end face of the blower 1.

[0060] Step 23: Pass the spring connecting pin 4 through the radial through hole at the other end of the core rod 3, and fix both ends of the spring connecting pin 4 to the wind trigger 1;

[0061] Step 24: The retainer 5 is placed over the end of the core rod 3 with the spring connecting pin 4 at its U-shaped open end, and is fixedly connected to the wind trigger 1 through the connecting ends on both sides, with the inner end face of the retainer 5 pressing against the end face of the core rod 3.

[0062] After assembling the high-lock nut 6 and the installation tool based on steps 21 to 24 above, the high-lock nut 6 and the high-lock bolt 7 can be installed, as shown in step 3 below.

[0063] Step 3: Using the pneumatic wrench 1 as an installation tool, a tightening force is applied by rotation, which drives the sleeve 2 and the high-lock nut 6 to rotate synchronously, thereby screwing the high-lock nut 6 and the high-lock bolt 7 together.

[0064] It should be noted that during the installation of the high-lock nut 6 and the high-lock bolt 7, the torque applied by the air wrench 1 is higher than the breaking torque of the high-lock nut 6 in the high-lock bolt assembly. In addition, during the installation process, not only is it necessary to apply a tightening force to the high-lock nut 6, but also to use the core rod 3 to apply a reverse force to the high-lock nut 6. In specific implementation, the spring connecting pin 4 passes through both sides of the core rod 3 and is fixed to the air wrench 1. In this way, the spring connecting pin 4 can provide a reverse force when the core rod 3 is subjected to tightening force. The core rod 3 and the spring connecting pin 4 share the tightening torque, avoiding the core rod 3 from being subjected to excessive tightening torque and breaking.

[0065] The following is an illustrative description of the implementation of the installation tool and installation method for the clearance fit high-lock bolt assembly provided in this embodiment of the invention.

[0066] Implementation Example

[0067] The fairing composite panel of a certain type of aircraft is connected to the metal frame using high-strength bolts CFBL1001AG5-3. The bolts have a diameter of 4mm, the product hole diameter is 4.18mm, and the bolts and the product have a clearance fit. The installation method using the installation tools provided in the above embodiment includes the following steps.

[0068] 1. First, install the high-lock bolt 7 into the through hole of the product, with clearance fit, and then screw the high-lock nut 6 onto the high-lock bolt.

[0069] 2. Install the wind trigger 1 with sleeve 2 onto the high-lock nut 6; and insert the core rod 3 with spring connecting pin 4 and retainer 5 into sleeve 2, so that the hexagonal boss of core rod 3 is inserted into the hexagonal groove of high-lock nut 6.

[0070] 3. Securely connect the spring connecting pin 4 and the retainer 5 to the wind trigger 1 respectively.

[0071] 4. Press the fan trigger 1 switch to perform the installation.

[0072] 5. After the high-lock nut 6 breaks, the installation is complete. Remove the wind trigger 1.

[0073] The above-mentioned method for installing the clearance-fit high-lock bolt assembly allows for the rapid installation of the high-lock nut 6 and the high-lock bolt 7, improving work efficiency. Furthermore, the structural installation of the pneumatic wrench 1, sleeve 2, core rod 3, spring connecting pin 4, and retainer 5 solves the problem of uniform stress distribution during the installation process when the clearance-fit high-lock bolt breaks under stress, avoiding tool damage, saving installation costs, and replacing manual tools. It offers high installation efficiency, is easy to operate, and can be used simply by pressing and switching on / off.

[0074] The installation tools and methods for the clearance fit high-lock bolt assembly provided in this invention have been applied to the installation of clearance fit high-lock bolts on the C919 airfoil fairing, with good results. This solves the installation problem of clearance fit high-lock bolts and can be widely applied.

[0075] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An installation tool for a clearance fit high-lock bolt assembly, characterized in that, The high-lock bolt assembly to be installed with clearance fit screws includes a high-lock nut (6) and a high-lock bolt (7). The installation tools include: a wind wrench (1), a sleeve (2), a core rod (3), and a spring connecting pin (4). The wind trigger (1) is provided with a threaded hole, one end of the sleeve (2) is provided with an external thread, and the other end is provided with an internal hexagonal hole. The sleeve (2) is screwed onto the wind trigger (1) through its external thread end, and the internal hexagonal hole at its other end is used to fit onto the hexagonal end of the high-lock nut (6). The high-lock nut (6) has a hexagonal groove at the center of its hexagonal end. The core rod (3) has a hexagonal boss at the central axis of one end and a radial through hole at the other end. The core rod (3) is fitted inside the sleeve (2) and its hexagonal boss is inserted into the hexagonal groove of the high-lock nut (6). The spring connecting pin (4) passes through the radial through hole at the other end of the core rod (3), and the two ends of the spring connecting pin (4) are fixedly connected to the wind trigger (1); The installation tool is used to apply tightening force by rotating the air wrench (1), thereby driving the sleeve (2) and the high-lock nut (6) to rotate synchronously, so as to realize the screw connection between the high-lock nut (6) and the high-lock bolt (7); wherein, during the screw connection installation of the high-lock nut (6) and the high-lock bolt (7), it is also used to drive the core rod (3) to rotate synchronously with it by rotating the high-lock nut (6), and during the synchronous rotation of the core rod (3) and the high-lock nut (6), a reverse force is applied to the core rod (3) by the spring connecting pin (4), thereby preventing the core rod (3) from breaking during rotation.

2. The installation tool for the clearance fit high-lock bolt assembly according to claim 1, characterized in that, The torque applied by the wind wrench (1) is higher than the breaking torque of the high-lock nut (6) in the high-lock bolt assembly.

3. The installation tool for the clearance fit high-lock bolt assembly according to claim 1, characterized in that, Also includes: Fixture (5); The fixture (5) is configured as a U-shaped structure with connecting ends on both sides. Its U-shaped open end is completely covered on one end of the core rod (3) where the spring connecting pin (4) is located, and it is fixedly connected to the wind trigger (1) through the connecting ends on both sides; so that the inner end face of the fixture (5) presses against the end face of the core rod (3) to apply a downward force to the core rod (3).

4. The installation tool for the clearance fit high-lock bolt assembly according to any one of claims 1 to 3, characterized in that, The high-lock nut (6) has a hexagonal end that is fitted to the sleeve (2) and the other end is an internal threaded connection end for connecting with the high-lock bolt (7). An annular fracture groove is provided circumferentially between the hexagonal end and the internal threaded connection end of the high-lock nut (6) so that the high-lock nut (6) will break under force during the installation of the high-lock nut (6) and the high-lock bolt (7) by screwing them together with an installation tool.

5. A method for installing a clearance-fit high-lock bolt assembly, characterized in that, The high-lock bolt assembly with clearance fit is installed using the installation tool as described in any one of claims 1 to 4, wherein the installation method includes: Step 1: Place the high-lock bolt (7) into the clearance-fit bolt hole on the product, and put the internal thread connection end of the high-lock nut (6) onto the screw end of the high-lock bolt (7); Step 2, install the high-lock nut (6) and installation tools; Step 3: Using the air wrench (1) of the installation tool, a tightening force is applied by rotation, which drives the sleeve (2) and the high-lock nut (6) to rotate synchronously, thereby screwing the high-lock nut (6) and the high-lock bolt (7) together. Step 2 includes: Step 21: Screw the wind trigger (1) to one end of the sleeve (2), and fit the inner hexagonal hole of the other end of the sleeve (2) onto the hexagonal end of the high-lock nut (6); Step 22: Insert the core rod (3) into the sleeve (2) with one end having a hexagonal boss, so that the hexagonal boss is inserted into the hexagonal groove of the high-lock nut (6), and the other end of the core rod (3) extends out of the end face of the wind trigger (1); Step 23: Pass the spring connecting pin (4) through the radial through hole at the other end of the core rod (3), and fix both ends of the spring connecting pin (4) to the wind trigger (1); In step 3, during the screw connection of the high-lock nut (6) and the high-lock bolt (7), the rotation of the high-lock nut (6) drives the core rod (3) to rotate synchronously with it. During the synchronous rotation of the core rod (3) and the high-lock nut (6), the spring connecting pin (4) applies a reverse force to the core rod (3) to prevent the core rod (3) from breaking during rotation.

6. The installation method of the clearance fit high-lock bolt assembly according to claim 5, characterized in that, The installation tool further includes: a retainer (5); step 2 further includes: Step 24: The fixing device (5) is placed over the end of the core rod (3) with the spring connecting pin (4) and fixedly connected to the wind trigger (1) through the connecting ends on both sides, and the inner end face of the fixing device (5) is pressed against the end face of the core rod (3).

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