Flexible deformation device suitable for narrow gap nut installation and installation method

Abstract

The invention discloses a flexible deformation device suitable for nut installation in a narrow gap and an installation method, relates to the technical field of equipment manufacturing and assembling, and aims to solve the technical problem that in the prior art, a traditional nut installation tool cannot assemble a nut in a specific gap. The bicycle comprises a front fork, a connecting block and a handle. The front fork is hinged to the connecting block through a first rotating shaft, and the connecting block is hinged to the handle through a second rotating shaft. The position relation among the front fork, the connecting block and the handle can be adjusted according to the position of a gap, and therefore the installation requirement of the small-gap nut is met.

Description

Technical Field

[0001] The invention relates to the technical field of equipment manufacturing and assembly, and in particular to a flexible deformation device and an installation method suitable for installing nuts with narrow gaps. Background Art

[0002] In the field of mechanical assembly, bolt connection, riveting and welding are very commonly used connection methods. Among them, bolt connection is popular because of its simple process. When riveting and welding methods are inconvenient to use, people mostly use bolt connection. When multiple joints are plugged into each other and fixed with bolts, due to the needs of the product structure, there is a small gap formed by the two butt plates to install nuts. At this time, the nut installation position is located in the small gap formed by the two plates, the width of the gap is only slightly larger than the thickness of the nut, the distance between the thread installation position and the plate boundary is large, and the gap between the joints is not as large as the distance between the thread installation position and the plate boundary. Therefore, traditional nut installation tools cannot complete the assembly task.

[0003] At the same time, the gap heights between multiple joints and the strip plates are not the same, which makes assembly more difficult.

[0004] Therefore, how to provide an installation tool that can solve the problem of assembling bolts and nuts in small gaps between plates is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a flexible deformation device suitable for installing nuts in narrow gaps, so as to solve the technical problem of the difficulty in installing nuts in small gaps between existing plates.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a flexible deformation device suitable for installing nuts in narrow gaps, comprising: a front fork, a connecting block, a handle and an adjusting bolt; the adjusting bolt is arranged on the front fork, and the adjusting bolt is used to adjust the distance between the lower end surface of the front fork and the head of the adjusting bolt; the front fork and the connecting block are hinged by a first rotating shaft, and the connecting block and the handle are hinged by a second rotating shaft.

[0008] Furthermore, the handle is an L-shaped structure.

[0009] Furthermore, the handle includes a vertical rod structure and a horizontal rod structure.

[0010] Furthermore, the lower end of the vertical rod structure is connected to the connecting block.

[0011] Furthermore, one end of the cross bar structure is arranged on the upper end of the vertical bar structure.

[0012] Furthermore, the other end of the crossbar structure is opposite to the installation position of the nut installed in the small gap between the plates.

[0013] Furthermore, a fixing position for fixing a nut is provided on the front fork.

[0014] Furthermore, an adhesive layer is provided on the fixing site.

[0015] Furthermore, the front fork includes a first fork body, a second fork body, a main body and a connecting rod; the first fork body and the main body are integrally formed, a first threaded hole is provided on the first fork body, a second threaded hole is provided on the second fork body at a position corresponding to the first threaded hole, and the connecting rod passes through the first threaded hole and the second threaded hole to adjust the distance between the first fork body and the second fork body.

[0016] Furthermore, a first positioning groove is provided on the first fork body, and a second positioning groove is provided on the second fork body at a position corresponding to the first positioning groove. After the connecting rod adjusts the distance between the first fork body and the second fork body, the first positioning groove and the second positioning groove serve as fixing grooves for fixing the nut to be installed.

[0017] Furthermore, the installation tool also includes a positioning assembly, which includes a first positioning rod, a second positioning rod, a fixing member and a rotating shaft; the first positioning rod is fixed to the cross bar structure, and the second positioning rod is arranged opposite to the first positioning rod; the rotating shaft is fixed to the groove of the cross beam structure, and one end of the second positioning rod can be rotatably arranged on the rotating shaft; a first groove is provided on the side wall of the first positioning rod facing the second positioning rod, and a second groove is provided at a position of the second positioning rod corresponding to the first groove, and when the first positioning rod and the second positioning rod are arranged opposite to each other, the first groove and the second groove are spliced ​​into a positioning through hole, and the positioning through hole is located directly above the fixing grooves on the first fork body and the second fork body.

[0018] Another aspect of the present invention provides an installation method, which uses the above-mentioned flexible deformation device suitable for installing a nut with a narrow gap, and the method comprises the following steps:

[0019] Step 1, fixing a nut on the front fork;

[0020] Step 2: The front fork and the connecting block droop naturally, downward along the installation gap, until the front end of the front fork touches the bottom plate;

[0021] Step 3: The handle moves in the opposite direction to the installation position, and the rear end of the front fork moves away from the installation position in accordance with the handle and touches the bottom plate;

[0022] Step 4: The handle moves toward the installation site so that the front fork moves the nut to just below the installation site.

[0023] Furthermore, the installation method also includes step five, wherein the screw passes through the installation through hole on the part to be fixed and is fastened to a nut arranged directly below the installation position.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] (1) The flexible deformation device provided by the present invention is suitable for installing nuts with narrow gaps, which includes a front fork, a connecting block and a handle that can rotate relative to each other. The front fork, the connecting block and the handle can be adaptively adjusted according to the gap between the plates so that their shapes can meet the installation requirements of the nuts with small gaps between the plates.

[0026] (2) The flexible deformation device suitable for installing nuts in narrow gaps provided by the present invention, when in use, utilizes the deformation characteristics between the front fork, the connecting block and the handle, so that the front fork and the connecting block can be vertically extended into the small gap between the plates. When the front end of the front fork abuts against the bottom plate of the part to be fixed, the handle is moved in the direction opposite to the installation position, and the rear end of the front fork complies with the pulling force of the handle and moves in the opposite direction to the installation position, and then drives the handle to move downward, so that the rear end of the front fork abuts against the bottom plate of the part to be fixed. At this time, the fixing position of the front fork faces the installation position, and the handle is moved toward the installation position, and the front fork drives the nut to move to the installation position. The installation position corresponds to the screw through hole of the part to be fixed, and the screw passes through the screw through hole to connect with the nut, thereby completing the installation process of the nut in the small gap between the plates.

[0027] (3) The present invention provides an installation method using a flexible deformation device suitable for installing nuts in narrow gaps. The method is simple to operate and has high positioning and installation accuracy.

[0028] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are only for the purpose of illustrating the particular invention and are not to be considered as limiting the invention. The same reference symbols denote the same components throughout the accompanying drawings.

[0030] Figure 1 A first structural schematic diagram of a flexible deformation device suitable for installing a nut with a narrow gap provided in the first embodiment of the present invention;

[0031] Figure 2A second structural schematic diagram of a flexible deformation device suitable for installing a nut in a narrow gap provided in the first embodiment of the present invention;

[0032] Figure 3 A third structural schematic diagram of the flexible deformation device suitable for installing a nut in a narrow gap provided in the first embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the structure of a front fork in a flexible deformation device suitable for installing a nut in a narrow gap provided in the first embodiment of the present invention;

[0034] Figure 5 A fourth structural schematic diagram of a flexible deformation device suitable for installing a nut in a narrow gap provided in the first embodiment of the present invention;

[0035] Figure 6 is a structural schematic diagram of the first part;

[0036] Figure 7 is a structural schematic diagram of the second part;

[0037] Figure 8 A schematic diagram of the structure of a joint of a first part being inserted into a tenon of a second part;

[0038] Fig. 9 A schematic diagram of nut installation using the flexible deformation device suitable for nut installation in a narrow gap according to an embodiment;

[0039] Fig.10 Flow chart of the installation method.

[0040] Reference numerals:

[0041] 1-front fork; 11-first fork body; 111-first positioning groove; 12-second fork body; 121-second positioning groove; 13-body; 14-connecting rod; 15-first component; 151-sliding groove; 152-opening structure; 16-second component; 161-sliding block; 162-fixing groove; 17-fixing structure; 18-first sub-component; 19-second sub-component; 20-Z-shaped rod; 21-Z-shaped groove; 211-first sub-groove; 212-second sub-groove; 213-third sub-groove; 22-first limiting rod; 23-second limiting rod; 24-action rod; 2-connecting block; 3-handle; 31-vertical rod structure; 32-horizontal rod structure; 321-storage groove; 4-positioning assembly; 41-first positioning rod; 411-first groove; 42-second positioning rod; 421-second groove; 43-fixing member; 44-rotating shaft; 45-binding member; 5-first part; 51-joint; 52-first through hole; 6-second part; 61-tenon; 62-strip plate; 63-partition; 64-second through hole 64; 7-first gap; 8-second gap; 9-adjusting bolt. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the present invention.

[0043] Embodiment 1

[0044] This embodiment provides a flexible deformation device suitable for installing nuts in narrow gaps, see Figure 1 , which comprises: a front fork 1, a connecting block 2, a handle 3 and an adjusting bolt 9; the adjusting bolt 9 is arranged on the front fork 1, and the adjusting bolt 9 is used to adjust the distance between the lower end surface of the front fork 1 and the head of the adjusting bolt 9; the front fork 1 and the connecting block 2 are hinged through a first rotating shaft, and the connecting block 2 and the handle 3 are hinged through a second rotating shaft.

[0045] like Figures 6 to 9 As shown, Figure 6 : is a schematic diagram of the structure of the first part 5, the first part 5 includes three groups of joints 51, and the joints 51 are provided with first through holes 52 for fixing screws; Figure 7 Schematic diagram of the structure of the second part 6 installed corresponding to the first part 5. Correspondingly, the second part 6 also includes three groups of tenons 61 corresponding to the joint 51. The second through hole 64 is opened at the position corresponding to the first through hole 52 on the tenon 61. Two adjacent tenons 61 on the second part 6 have a partition 63. The second part 6 also includes a strip plate 62. The strip plate 62 is located below the tenon 61, and there is a certain gap between the strip plate 62 and the tenon 61. Figure 8 and Fig. 9 As shown, the second part 6 is assembled to the first part 5, the tenon 61 of the second part 6 is inserted into the joint 51 of the first part 5, a first gap 7 is provided between the joint 51 of the first part 5 and the strip plate 62 of the second part 6, the size of the first gap 7 is larger than the thickness of the nut, a second gap 8 is provided between the joint 51 and the partition 63, the distance of the second gap 8 is larger than the thickness of the nut. The adjusting bolt 9 can adjust the height of the front fork 1 in the first gap 7, so that the nut is arranged near the first through hole 52 and the second through hole 64 of the installation site, which is more convenient for use and installation.

[0046] In the embodiment, the flexible deformation device suitable for installing a nut in a narrow gap carries the nut and moves downward from the second gap 8 to the strip plate 62, then transports the nut to the first gap 7, and then pushes the nut to the installation position corresponding to the first through hole 52 and the second through hole 64. During operation, the nut can be carried to move vertically in the second gap 8 and then move horizontally in the first gap 7 by utilizing the adaptive connection relationship between the front fork 1, the connecting block 2 and the handle 3, and finally completes the installation of the nut in the small gap between the plates.

[0047] In the embodiment, the handle 3 is an L-shaped structure.

[0048] In the embodiment, the handle 3 includes a vertical rod structure 31 and a horizontal rod structure 32 .

[0049] In the embodiment, the lower end of the vertical rod structure 31 is connected to the connecting block 2 .

[0050] The vertical rod structure 31 is connected to the connecting block 2 . When the connecting block 2 and the front fork 1 are vertically arranged, the vertical rod structure 31 can increase its vertical height. When the second gap 8 is higher, the vertical rod structure 31 helps to transport the nut to the strip plate 62 .

[0051] In the embodiment, one end of the cross bar structure 32 is arranged on the upper end of the vertical bar structure 31 .

[0052] In the embodiment, the other end of the crossbar structure 32 is opposite to the installation site.

[0053] The operator holds the crossbar structure 32 for easy operation.

[0054] In the embodiment, a fixing position for fixing a nut is provided on the front fork 1 .

[0055] The opening structure 152 at the front end of the front fork 1 serves as a fixing point, and the fixing point is used to fix the nut.

[0056] In an embodiment, an adhesive layer is disposed on the fixing site.

[0057] The nut is adhered to the adhesive layer, which is a glue coated on the fixing position to which the nut can be adhered.

[0058] Embodiment 2

[0059] The flexible deformation device suitable for installing a nut with a narrow gap described in this embodiment is based on the first embodiment. Figure 2 As shown, the front fork 1 includes a first fork body 11, a second fork body 12, a main body 13 and a connecting rod 14; the first fork body 11 and the main body 13 are integrally formed, a first threaded hole is provided on the first fork body 11, a second threaded hole is provided on the second fork body 12 at a position corresponding to the first threaded hole, and the connecting rod 14 passes through the first threaded hole and the second threaded hole to adjust the distance between the first fork body 11 and the second fork body 12.

[0060] Furthermore, a receiving groove 321 is formed on the crossbar structure 32 .

[0061] Furthermore, a first positioning groove 111 is formed on the first fork body 11, and a second positioning groove 121 is formed on the second fork body 12 at a position corresponding to the first positioning groove 111. When the connecting rod 14 adjusts the distance between the first fork body 11 and the second fork body 12, the first positioning groove 111 and the second positioning groove 121 serve as fixing grooves for fixing the nut to be installed.

[0062] When different first parts 5 and second parts 6 are fixedly connected, nuts of different sizes need to be used. In this embodiment, the distance between the second fork bodies 12 and 12 is adjusted by rotating the connecting rod 14, thereby changing the distance between the first positioning groove 111 and the second positioning groove 121. Nuts of different sizes can be fixed between the first positioning groove 111 and the second positioning groove 121 to meet the installation requirements of different parts.

[0063] Embodiment 3

[0064] The flexible deformation device suitable for installing a nut with a narrow gap described in this embodiment is based on the first embodiment. Figure 3 As shown, the front fork 1 includes a first component 15, a second component 16 and a fixing structure 17; one end of the first component 15 is hinged to the connecting block 2, and the other end of the first component 15 is provided with an opening structure 152, and a sliding groove 151 is provided on the side wall of the opening structure 152; the second component 16 matches the opening structure 152, and a slider 161 is provided at a position matching the sliding groove 151 on the outer wall of the second component 16, and the slider 161 is inserted into the sliding groove 151, and the second component 16 is connected to the first component 15, and the second component 16 also includes a fixing groove 162 for clamping a nut as a fixing position for fixing the nut; the fixing structure 17 is self- Dynamic locking structure, the fixed structure 17 is hinged to the second component 16 through a first rotating shaft, the second component 16 is provided with a first column, the first column is located at the front end of the slider 161, the first column and the first rotating shaft are connected by a spring, when the second component 16 is inserted into the first component 15, the slider 161 slides to the other end of the slide groove 151, the first column contacts and rotates with the side wall of the second component 16, the first column drives the first rotating shaft to rotate through the spring, the first rotating shaft drives the rotating shaft of the fixed structure 17, the fixed structure 17 is a rectangular frame, the inner frame of the fixed structure 17 can accommodate the first component 15 and the second component 16, and the first component 15 and the second component 16 are fixedly connected.

[0065] In the embodiment, second components 16 of different sizes are included, and multiple second components 16 have the same external dimensions, that is, the external dimensions of multiple second components 16 all match the opening structure 152 of the first component 15, and the sizes of the fixing grooves 162 of different second components 16 are different, so that different second components 16 can fix nuts of different sizes and complete the installation of nuts of different sizes.

[0066] During use of this embodiment, when nuts of different sizes need to be installed, the second component 16 of an inappropriate size can be removed from the first component 15 and replaced with the second component 16 of the appropriate size to achieve the technical effect of installing nuts of different sizes.

[0067] Embodiment 4

[0068] The flexible deformation device suitable for installing a nut with a narrow gap described in this embodiment is based on the second embodiment. The connecting block 2 includes a first sub-component, a second sub-component and a Z-shaped rod 20. Figure 4 As shown, the Z-shaped rod 20 is Z-shaped, one end of the first sub-component is hinged to the front fork, and the other end of the first sub-component is connected to one end of the Z-shaped rod 20; the second sub-component and the handle are provided with a Z-shaped groove 21 for accommodating the connecting member, and the Z-shaped groove 21 includes a first sub-groove 211, a second sub-groove 212 and a third sub-groove 213, the first sub-groove 211 is opened on the second sub-component, the second sub-groove 212 is opened on the vertical rod structure, and the third sub-groove 213 is opened on the cross bar structure, and a first limiting rod 22 is arranged on the cross bar, and the first limiting rod 22 is correspondingly arranged above the third sub-groove 213; a second limiting rod 23 is arranged on the second sub-component, and the second limiting rod 23 is correspondingly arranged on the first sub-groove 211; an action rod 24 is arranged on the Z-shaped rod 20, and the action rod 24 is located at the other end of the Z-shaped rod 20.

[0069] When the flexible deformation device suitable for installing nuts in narrow gaps described in this embodiment is in use, when the nut is transported from the second gap to the first gap, when the installation position of the nut in the small gap between the plates is larger than the length of the connecting block and the front fork, the action rod 24 is pushed on the third sub-slot 213 in the crossbar structure, so that the Z-shaped rod 20 moves toward the installation position along the third sub-slot 213, and the first sub-component connected to one end of the Z-shaped rod 20 is pushed by the action rod 24 to push the front fork toward the installation position, thereby ensuring that the nut is transported to the installation position.

[0070] Embodiment 5

[0071] The flexible deformation device suitable for installing a nut with a narrow gap described in this embodiment is based on the second embodiment. Figure 5As shown, the installation tool also includes a positioning component 4, which includes a first positioning rod 41, a second positioning rod 42, a fixing member 43 and a rotating shaft 44; the first positioning rod 41 is fixed on the cross bar structure 32, and the second positioning rod 42 is arranged opposite to the first positioning rod 41; the rotating shaft 44 is fixed at the storage groove 321 of the cross beam structure, and the rotating shaft 44 is arranged close to the second positioning rod 42, and one end of the second positioning rod 42 can be rotatably arranged on the rotating shaft 44; a first groove 411 is provided on the side wall of the first positioning rod 41 facing the second positioning rod 42, and a second groove 421 is provided at a position of the second positioning rod 42 corresponding to the first groove 411, and when the first positioning rod 41 and the second positioning rod 42 are arranged opposite to each other, the first groove 411 and the second groove 421 are spliced ​​into a positioning through hole, and the positioning through hole is located directly above the fixing position on the front fork 1.

[0072] Furthermore, the fixing member 43 is an elastic rope, which is arranged on the first positioning rod 41 . When the first positioning rod 41 and the second positioning rod 42 are arranged relatively to each other, the fixing member 43 binds and fixes the first positioning rod 41 and the second positioning rod 42 .

[0073] In the embodiment, the nut is delivered to the installation position by utilizing the structural changes of the front fork 1, the connecting block 2 and the handle 3. The installation position is located directly below the first through hole 52 of the first part 5 and the second through hole 64 of the second part 6. Figure 5 As shown, at this time, the positioning through hole formed by the first groove 411 and the second groove 421 is located directly above the installation site, and the screw passes through the positioning through hole formed by the first groove 411 and the second groove 421, the first through hole 52 and the second through hole 64 in sequence, and is positioned to the central through hole of the nut, and then the screw is fixedly connected to the nut; the binding member 45 is an elastic rope body, and the binding member 45 is removed from the first positioning rod 41 and the second positioning rod 42, and the second fixing rod is rotated, the second positioning rod 42 is separated from the first positioning rod 41, and the screw can be separated from the installation tool. The screw and the nut have completed the preliminary connection, and the installation tool can be taken out from the installation gap between the first part 5 and the second part 6, and then the screw is tightened until the fixed connection between the first part 5 and the second part 6 is completed.

[0074] Embodiment 6

[0075] Another aspect of the present invention provides an installation method, such as Fig.10 As shown, the flexible deformation device suitable for installing a nut with a narrow gap is used to fix the first part 5 and the second part 6 together. The method includes the following steps:

[0076] Step 1, fixing the nut on the front fork 1; the front fork 1 is provided with an adhesive layer, and the nut is adhered to the front fork, so that the nut can move with the front fork 1 to the nut installation position of the small gap between the plates;

[0077] Step 2: The front fork 1 and the connecting block 2 droop naturally, downward along the second installation gap 8, until the front end of the front fork 1 touches the bottom plate, that is, touches the strip plate;

[0078] Step 3: The handle 3 moves in the opposite direction to the installation position, and the rear end of the front fork 1 moves away from the installation position in accordance with the handle 3 and touches the bottom plate; the front end of the front fork 1 is kept in contact with the bottom plate, and the handle 3 is gently pulled in the opposite direction to the installation position to tilt the front fork 1;

[0079] Step 4: The handle 3 moves toward the installation site so that the front fork 1 transports the nut to the bottom of the installation site. When the handle 3 is pushed toward the installation site, the front fork 1 moves along the tilt angle, and then the handle 3 moves downward so that the rear end of the front fork 1 also contacts the bottom plate, and then the handle 3 continues to be pushed toward the installation site to push the nut into the first gap 7 until the nut is transported to the bottom of the installation site.

[0080] In the embodiment, the installation method further includes step five, wherein the screw passes through the installation through hole on the part to be fixed and is fastened to a nut arranged directly below the installation position.

[0081] In this embodiment, the installation method uses the adaptive rotation of the front fork 1, the connecting block 2 and the handle 3 to set the nut fixed on the front fork on the front fork 1. The front fork 1, the connecting block 2 and the vertical rod structure 31 are vertically downward, driving the nut from the second gap 8 into between the first part and the second part. By controlling the movement direction of the handle, the nut on the front fork 1 is directed toward the installation site. Push the handle 8 to push the front fork and the nut into the first gap 7 until they move to just below the installation site. The screw is passed through the first through hole on the first part, the second through hole on the second part and connected to the center hole of the nut to complete the installation process of the small gap nut between the plates.

[0082] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A flexible deformation device suitable for installing nuts in narrow gaps, characterized in that: include: A front fork (1), a connecting block (2), a handle (3) and an adjusting bolt (9); the adjusting bolt (9) is arranged on the front fork (1); the front fork (1) and the connecting block (2) are hingedly connected via a first rotating shaft, and the connecting block (2) and the handle (3) are hingedly connected via a second rotating shaft.

2. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 1, characterized in that: The handle (3) is an L-shaped structure.

3. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 2, characterized in that: The handle (3) comprises a vertical rod structure (31) and a horizontal rod structure (32).

4. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 3, characterized in that: The lower end of the vertical rod structure (31) is connected to the connecting block (2).

5. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 4, characterized in that: One end of the crossbar structure (32) is arranged on the upper end of the vertical bar structure (31).

6. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 5, characterized in that: The other end of the crossbar structure (32) is opposite to the installation position of the nut installed in the small gap between the plates.

7. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 6, characterized in that: The front fork (1) is provided with a fixing point for fixing a nut.

8. The flexible deformation device suitable for installing nuts in narrow gaps according to claim 7, characterized in that: An adhesive layer is arranged on the fixing site.

9. An installation method, characterized in that: Using the flexible deformation device suitable for installing a nut with a narrow gap as described in any one of claims 1 to 8, the method comprises the following steps: Step 1, fixing a nut on the front fork (1); Step 2: the front fork (1) and the connecting block (2) droop naturally downward along the installation gap until the front end of the front fork (1) touches the bottom plate; Step 3: the handle (3) moves in the opposite direction to the installation position, and the rear end of the front fork (1) moves away from the installation position in accordance with the movement of the handle (3) and touches the bottom plate; Step 4: The handle (3) moves toward the installation site, so that the front fork (1) moves the nut to just below the installation site.

10. The installation method according to claim 9, characterized in that: The method further comprises step five, wherein the screw passes through the mounting through hole on the part to be fixed and is fastened to a nut arranged just below the mounting position.

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