Fastening device

Abstract

The utility model provides a fastening device which comprises a bolt, a nut and a movable part, the bolt comprises a meshing part, and the meshing part extends in the axial direction of the bolt; the nut comprises a protruding part, and the protruding part protrudes outwards from the surface of the nut. The movable part is rotationally connected with the convex part; wherein one end of the bolt is sleeved with the nut, the meshing part is connected with the nut in a meshing mode, and the nut can move in the axial direction of the meshing part. According to the fastening device, the height of the product is adjusted by adjusting the meshing position of the nut and the bolt, the angle of the product is adjusted by adjusting the connecting angle of the nut and the movable part, the fastening device is simple in structure, the number of single finished products is small, and the angle and the height of the product can be adjusted at the same time.

Description

Technical Field

[0001] The utility model relates to the field of mechanical connection, in particular to a fastening device. Background Art

[0002] With the development of technology, mechanical equipment has become an indispensable part of life, and fastening devices have the function of connecting two or more parts and are widely used in mechanical equipment. Bolts are one of the most common fastening devices in life. They are cylindrical threaded fastening devices equipped with nuts. Bolts consist of a head and a screw (a cylinder with external threads). They need to cooperate with nuts to fasten and connect two parts with through holes. Unscrewing the nut from the bolt can separate the two parts, so the connection between the bolt and the nut is a detachable connection. At present, with the improvement of production technology, especially in the field of automobile production technology, the requirements for product installation and adjustment are getting higher and higher. Simple and firm installation methods are increasingly recognized by engineers. However, bolts at this stage only have a single fixing function. When engineers adjust the angle and height of the product, they need to use other fasteners or other structural parts. This method makes the structure between parts complicated, installation and disassembly complicated, and reduces work efficiency. Utility Model Content

[0003] The embodiment of the utility model provides a fastening device, which has a simple structure and can adjust the height and angle of a product.

[0004] The utility model provides a fastening device, which comprises:

[0005] The bolt comprises a bite portion, wherein the bite portion is extended along the axial direction of the bolt;

[0006] The nut comprises a protrusion, wherein the protrusion is protruded outward from the surface of the nut;

[0007] A movable member, the movable member being rotatably connected to the raised portion;

[0008] Wherein, the nut is sleeved on one end of the bolt, the engaging portion is engaged with the nut, and the nut can move along the axial direction of the engaging portion.

[0009] In the fastening device provided by the utility model, the nut also includes a connecting groove and an opening, the connecting groove and the opening are both extended along the axial direction of the nut, the opening connects the connecting groove and the outside, and one end of the bolt is located in the connecting groove.

[0010] In the fastening device provided by the utility model, the protrusion includes a plurality of first protrusions, and the plurality of first protrusions are correspondingly arranged on both sides of the opening. The movable part includes a plurality of through holes, and each of the first protrusions is respectively embedded in each of the through holes and rotatably connected to the through holes.

[0011] In the fastening device provided by the utility model, the protrusion also includes a second protrusion, which is arranged on the other side of the nut relative to the opening and protrudes in a direction away from the opening. The movable part also includes a fixing groove, which is formed by an inward depression on one side of the movable part. The second protrusion is embedded in the fixing groove and is rotatably connected to the fixing groove.

[0012] In the fastening device provided by the utility model, the second protrusion is provided with a fixing protrusion, and the fixing protrusion is protruded outwardly from one side of the second protrusion. The fixing groove includes a fixing part, and the fixing part is formed by the groove wall of the fixing groove being recessed inwardly. The fixing protrusion is embedded in the fixing part and is rotatably connected to the fixing part.

[0013] In the fastening device provided by the utility model, the other end of the bolt includes a clamping portion, and the clamping portion is arranged to protrude outward along the circumference of the bolt; the fastening device also includes a fixing piece, and the fixing piece includes an opening, and one end of the bolt passes through the opening to enable the clamping portion to be clamped with the fixing piece.

[0014] In the fastening device provided by the utility model, the fastening device also includes a flat washer, which is sleeved on the bolt and clamped with the bolt. The flat washer is arranged adjacent to the fixing piece and is located on a side of the fixing piece away from the clamping portion.

[0015] In the fastening device provided by the utility model, the bolt further comprises a groove, the groove is formed by being recessed inwardly along the circumference of the bolt, and the flat washer is clamped in the groove.

[0016] In the fastening device provided by the utility model, the flat washer comprises a through hole, one end of the bolt passes through the through hole and is connected to the nut, and the through hole is serrated.

[0017] In the fastening device provided by the utility model, the fastening device further comprises a buffer member, and the buffer member is sleeved on the outside of the bolt and is located between the fixing member and the clamping portion.

[0018] The utility model provides a fastening device, which includes a bolt, a nut and a movable part, wherein the bolt includes a bite portion, which is extended along the axial direction of the bolt; the nut includes a protrusion, which is protruded outward from the surface of the nut; the movable part is rotatably connected with the protrusion; wherein the nut is sleeved at one end of the bolt, the bite portion is bite-connected with the nut, and the nut can move along the axial direction of the bite portion. The application adjusts the height of the product by adjusting the bite position of the nut and the bolt, and adjusts the angle of the product by adjusting the connection angle between the nut and the movable part. The structure of the fastening device is simple, the number of single-piece finished products is small, and the angle and height of the product can be adjusted at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a structural diagram of the fastening device in the embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of the fastening device in the embodiment of the utility model;

[0022] Figure 3 This is a structural diagram of the combination of a bolt and a nut in an embodiment of the utility model;

[0023] Figure 4 It is an exploded view of some structural parts of the fastening device in the embodiment of the utility model;

[0024] Figure 5 It is a structural diagram of the movable parts in the embodiment of the utility model;

[0025] The reference numerals in the figures are:

[0026] 100, bolt; 110, bite portion; 120, clamping portion; 130, groove; 200, nut; 210, protrusion; 211, first protrusion; 212, second protrusion; 2121, fixing protrusion; 220, connecting groove; 230, opening; 300, movable part; 310, through hole; 320, fixing groove; 321, fixing part; 330, sliding groove; 400, fixing part; 410, opening; 500, flat washer; 510, through hole; 600, buffer part. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0028] Reference Figures 1 to 5 As shown, it shows an embodiment of the fastening device of the utility model. The fastening device includes a bolt 100, a nut 200 and a movable part 300, wherein the bolt 100 includes a bite portion 110, and the bite portion 110 is arranged to extend along the axial direction of the bolt 100; the nut 200 includes a protrusion 210, and the protrusion 210 is arranged to protrude outward from the surface of the nut 200; the movable part 300 is rotatably connected to the protrusion 210; wherein the nut 200 is sleeved at one end of the bolt 100, the bite portion 110 is bite-connected with the nut 200, and the nut 200 can move along the axial direction of the bite portion 110.

[0029] Specifically, the fastening device is used to fix and connect different structural parts of the product, and the other structural parts of the product are fixedly connected by the fastening device; the fastening device includes a bolt 100, a nut 200, and a movable part 300. One end of the bolt 100 is connected to the nut 200. In this embodiment, the nut 200 is sleeved on the outside of one end of the bolt 100, and the other end of the bolt 100 is connected to the fixed part 400, and one side of the nut 200 is rotatably connected to the movable part 300. The movable part 300 is fixedly connected to the other structural parts of the product, and the movable part 300 is rotatably connected to the protrusion 210, so the movable part 300 has the function of movable adjustment, so that the angles of other structural parts of the product can be adjusted.

[0030] The bolt 100 includes an engaging portion 110, and the engaging portion 110 is engaged with the nut 200. The engaging portion 110 is arranged on the surface of the bolt 100 and is arranged along the axial direction of the bolt 100, that is, the engaging portion 110 has a certain height, and the nut 200 can move along the height direction of the engaging portion 110. The moving distance of the nut 200 is fixed, and the nut 200 has a certain stroke, and the stroke refers to the movement amount of the nut 200 moving up or down, so the engaging portion 110 is arranged on the surface of the bolt 100 and ... The engagement position of the engagement portion 110 and the nut 200 can be adjusted, that is, the connection position of the engagement portion 110 and the nut 200 can be adjusted along the height direction of the engagement portion 110, so that the connection position of the nut 200 and the bolt 100 can be adjusted, and then the distance between other structural parts of the product connected by the fastening device can be adjusted, that is, the connection height of other structural parts can be adjusted; in this embodiment, the engagement portion 110 is provided with a thread, and the engagement connection with the nut 200 is performed through the thread.

[0031] The nut 200 includes a protrusion 210, which is protruded outward from the surface of the nut 200, and the protrusion 210 is used to connect with the movable part 300. In this embodiment, the nut 200 is a plastic part, and the nut 200 is in a cylindrical shape. There are multiple protrusions 210, and the multiple protrusions 210 are evenly arranged on the surface of the nut 200 along the circumference of the nut 200. The surface of the nut 200 refers to the outer surface of the nut 200, so that the nut 200 can be connected with the movable part 300 on all sides, thereby improving the structural stability of the fastening device. At the same time, the nut 200 is a plastic part, so that the overall weight of the fastening device is light and the production cost is low.

[0032] Among them, when installing the fastening device, the nut 200 is sleeved on the outside of one end of the bolt 100, and the occlusal portion 110 and the nut 200 are engaged and connected, so as to achieve the fixation of the nut 200 and the bolt 100; at the same time, the nut 200 can move along the axial direction of the occlusal portion 110, that is, the staff can adjust the connection position of the nut 200 and the occlusal portion 110, so as to adjust the connection position of the nut 200 and the bolt 100; the other end of the bolt 100 is connected to other structural parts, at this time, the position of the bolt 100 is relatively fixed, and can only rotate clockwise or counterclockwise; the protrusion 210 is rotatably connected with the movable part 300, that is, the movable part 300 is sleeved on the outside of the nut 200, and the angle of the movable part 300 can be adjusted by rotating the movable part 300; thereby connecting other structural parts of the product through the fastening device, and adjusting the height and angle between the connected structural parts.

[0033] The present application provides a fastening device, which can adjust the height of a product by adjusting the engagement position of the nut 200 and the bolt 100, and can adjust the angle of the product by adjusting the connection angle between the nut 200 and the movable part 300. The fastening device has a simple structure, a small number of single-piece finished products, and can simultaneously adjust the angle and height of the product.

[0034] In one embodiment, referring to Figures 1 to 4As shown, the nut 200 further includes a connecting groove 220 and an opening 230, both of which are extended along the circumference of the nut 200, and the opening 230 connects the connecting groove 220 with the outside, and one end of the bolt 100 is located in the connecting groove 220. Specifically, the nut 200 is sleeved on the outer side of the bolt 100, and the nut 200 further includes a connecting groove 220, which is formed by one end of the nut 200 being recessed toward the other end of the nut 200 along the axial direction of the nut 200, so that one end of the bolt 100 can be inserted from one end of the nut 200 toward the direction of the connecting groove 220, and one end of the bolt 100 is located in the connecting groove 220, at which time the bite portion 110 is partially or completely located in the connecting groove 220, and the bite portion 110 is bite-connected with the connecting groove 220, thereby realizing the connection between the bolt 100 and the nut 200.

[0035] The nut 200 also includes an opening 230, which is extended along the axial direction of the nut 200, and the opening 230 connects the connecting groove 220 and the outside, that is, the nut 200 is an unclosed structure, so that the parts of the nut 200 located at both ends of the opening 230 are elastic. When the bolt 100 is inserted into the connecting groove 220, if the size of the bolt 100 is large, the nut 200 moves in a direction away from the connecting groove 220, so that the bolt 100 can be fully inserted into the connecting groove 220, so that the nut 200 can adapt to the bolts 100 of various sizes, and has a wider applicability; and under the action of elastic force, the nut 200 clamps the bolt 100, so that the bolt 100 is fixedly connected to the nut 200, and the bite portion 110 is bite-connected with the nut 200, thereby improving the firmness of the connection between the bolt 100 and the nut 200.

[0036] In particular, in this embodiment, the nut 200 is an unclosed cylindrical structure, the connecting groove 220 passes through both ends of the nut 200, one end of the bolt 100 is a cylindrical structure, a thread with a certain height is provided on the surface of the bolt 100, and one end of the bolt 100 is embedded in the connecting groove 220 and is engaged with the nut 200.

[0037] In a specific embodiment, refer to Figures 1 to 5As shown, the protrusion 210 includes a plurality of first protrusions 211, and the plurality of first protrusions 211 are correspondingly arranged on both sides of the opening 230. The movable member 300 includes a plurality of through holes 310, and each of the first protrusions 211 is respectively embedded in each of the through holes 310 and is rotatably connected with the through holes 310. Specifically, the movable member 300 includes a mounting groove, and the mounting groove is used to mount the nut 200. In this embodiment, the mounting groove is formed by an inward depression of one end of the movable member 300, and the nut 200 is embedded in the mounting groove by one end of the movable member 300, so that the movable member 300 is sleeved on the outside of the nut 200; the protrusion 210 includes a plurality of first protrusions 211, and the plurality of first protrusions 211 are located on both sides of the opening 230 and are protruded from the surface of the nut 200 in a direction away from the connection groove 220; the movable member 300 is provided with a plurality of through holes 310, and the through holes 31 The number and position of 0 are set corresponding to the number and position of the first protrusions 211, the through hole 310 is formed by the groove wall of the mounting groove being recessed in the direction away from the mounting groove, the through hole 310 can pass through the groove wall of the mounting groove, or not pass through the groove wall of the mounting groove, which is not limited here, the first protrusion 211 is correspondingly embedded in the through hole 310, so that the nut 200 is connected to the movable part 300, and the first protrusion 211 and the through hole 310 are rotatably connected, so the movable part 300 can rotate relative to the nut 200, and the angle of the product can be adjusted by adjusting the angle between the movable part 300 and the nut 200.

[0038] In particular, in this embodiment, two first protrusions 211 are provided, and the two first protrusions 211 are arranged on two opposite sides of the opening 230, and the two first protrusions 211 are cylindrical structures adapted to the through hole 310; the through hole 310 is respectively provided on both sides of the movable part 300, and the movable part 300 is provided with a sliding groove 330 between the through hole 310 and the edge of one end of the movable part 300, and the sliding groove 330 is provided on the groove wall of the installation groove, and the sliding groove 330 extends from one end of the movable part 300 toward the through hole 310 and is connected with the through hole 310, and the first protrusion 211 slides along the groove of the sliding groove 330 from one side of the movable part 300 toward the through hole 310 until it is engaged with the through hole 310, thereby facilitating the installation of the nut 200 and the movable part 300.

[0039] In one embodiment, referring to Figures 1 to 5As shown, the protrusion 210 also includes a second protrusion 212, which is arranged on the other side of the nut 200 relative to the opening 230 and is protruded in a direction away from the opening 230. The movable part 300 also includes a fixing groove 320, which is formed by an inward depression on one side of the movable part 300. The second protrusion 212 is embedded in the fixing groove 320 and is rotatably connected to the fixing groove 320. Specifically, the protrusion 210 also includes a second protrusion 212, which is arranged along the axial direction of the nut 200 and protrudes outward from the nut 200, and the second protrusion 212 is arranged corresponding to the position of the opening 230, that is, the second protrusion 212 and the opening 230 are correspondingly located on both sides of the nut 200, and the first protrusion 211 is located on the other two sides of the nut 200. In this embodiment, the plane where the second protrusion 212 is located is consistent with the plane where the opening 230 is located; the movable part 300 also includes a fixing groove 320, and the fixing groove 320 is formed by an inward depression on one side of the movable part 300. The fixed groove 320 is communicated with the installation groove and is formed by a depression in the groove wall of the installation groove. The fixed groove 320 is adapted to the second protrusion 212, and the second protrusion 212 is embedded in the fixed groove 320. The second protrusion 212 is rotatably connected with the fixed groove 320. The fixed groove 320 has a limiting and fixing function on the second protrusion 212, thereby further fixing the nut 200 and the movable part 300. When the movable part 300 and the nut 200 rotate, the groove wall of the fixed groove 320 can limit the second protrusion 212 to prevent the nut 200 from shaking left and right during rotation, thereby improving the structural stability of the product.

[0040] In a specific embodiment, refer to Figures 1 to 5As shown, the second protrusion 212 is provided with a fixing protrusion 2121, and the fixing protrusion 2121 is protruded outwardly from one side of the second protrusion 212. The fixing groove 320 includes a fixing portion 321, and the fixing portion 321 is formed by the groove wall of the fixing groove 320 being recessed inwardly. The fixing protrusion 2121 is embedded in the fixing portion 321 and is rotatably connected to the fixing portion 321. Specifically, the second raised portion 212 also includes a fixed protrusion 2121, and the fixed protrusion 2121 is provided with one or more, which is not limited here. The fixed protrusion 2121 is provided by a side of the second raised portion 212. In this embodiment, two fixed protrusions 2121 are provided, and the two fixed protrusions 2121 are correspondingly arranged on both sides of the second raised portion 212, and are both provided by a side surface of the second raised portion 212 in a direction perpendicular to the second raised portion 212, and the fixed protrusion 2121 is a cylindrical structure; the fixed groove 320 also includes a fixed portion 321, and the fixed portion 321 is provided by the groove wall of the fixed groove 320 away from the fixed groove 320 The fixing portion 321 is formed by being recessed in the direction of the fixing protrusion 2121, and the fixing portion 321 is adapted to the fixing protrusion 2121, so that the fixing protrusion 2121 is embedded in the fixing portion 321, so that the nut 200 is further engaged with the movable part 300, so that the connection between the nut 200 and the movable part 300 is more secure, and the structural stability of the fastening device is improved to improve the structural stability of the product; the fixing protrusion 2121 is rotatably connected with the fixing portion 321, so that the movable part 300 is rotatably connected with the nut 200, which is convenient for adjusting the angle between the movable part 300 and the nut 200 to adjust the angle of the product.

[0041] In one embodiment, referring to Figures 2 to 4As shown, the other end of the bolt 100 includes a clamping portion 120, and the clamping portion 120 is convexly arranged along the circumference of the bolt 100; the fastening device also includes a fixing member 400, and the fixing member 400 includes an opening 410, and one end of the bolt 100 passes through the opening 410 so that the clamping portion 120 is clamped with the fixing member 400. Specifically, the fastening device also includes a fixing member 400, and the fixing member 400 is used to fix other structural parts of the product; one end of the bolt 100 is connected to the nut 200, and the other end of the bolt 100 is connected to the fixing member 400. There are various ways to connect the bolt 100 and the fixing member 400. In this embodiment, a clamping portion 120 is provided on the other end of the bolt 100, and the clamping portion 120 is convexly arranged on the other end of the bolt 100 along the circumference of the bolt 100. The fixing member 400 includes an opening Hole 410, one end of the bolt 100 is passed through the opening 410 and is set in the direction of the nut 200, and is engaged with the nut 200, the nut 200 is connected to the movable part 300, so that the fixing part 400 is engaged with the clamping part 120, and the fixing part 400 and the movable part 300 are connected through the bolt 100 and the nut 200, thereby fastening and connecting two other structural parts of the product; the connection method of the bolt 100 and the fixing part 400 is simple, the operation is simple, and the production cost is low.

[0042] In a specific embodiment, refer to Figures 1 to 4As shown, the fastening device further includes a flat washer 500, which is sleeved on the bolt 100 and clamped with the bolt 100. The flat washer 500 is disposed adjacent to the fixing member 400 and is located on a side of the fixing member 400 away from the clamping portion 120. Specifically, the fastening device further includes a flat washer 500, which is used to prevent the bolt 100 from falling off the fixing member 400. Therefore, the flat washer 500 is sleeved on the bolt 100, and the flat washer 500 is adjacent to the fixing member 400. The flat washer 500 is located on a side of the fixing member 400 away from the clamping portion 120. In this embodiment, the flat washer 500 abuts against a side of the fixing member 400 away from the clamping portion 120. Therefore, when one end of the bolt 100 passes through the fixing member 400 and then passes through the flat washer 500, The flat washer 500 is sleeved on the bolt 100, and the flat washer 500 is located between the fixing member 400 and the bite portion 110. The flat washer 500 is engaged with the bolt 100, and the size of the flat washer 500 is larger than the diameter of the opening 410 of the fixing member 400, so that the side of the bolt 100 connected with the flat washer 500 is engaged with the side of the fixing member 400, thereby preventing the bolt 100 from falling off from the fixing member 400, improving the fastening of the bolt 100, and further improving the structural stability of the fastening device. In particular, the flat washer 500 in this embodiment is made of metal.

[0043] In one embodiment, referring to Figure 4 As shown, the bolt 100 further includes a groove 130 , which is formed by being recessed inward along the circumference of the bolt 100 , and the flat washer 500 is engaged with the groove 130 . Specifically, there are multiple ways of clamping the flat washer 500 with the bolt 100. In the present embodiment, the bolt 100 further includes a groove 130, which is disposed on the surface of the bolt 100 and is formed by the surface of the bolt 100 being recessed inwardly. The groove 130 is disposed on the surface of the bolt 100 along the circumference of the bolt 100, and the groove 130 is located on the side of the bite portion 110 close to the clamping portion 120. Therefore, when one end of the bolt 100 passes through the flat washer 500, the flat washer 500 is clamped with the groove 130, thereby clamping the flat washer 500 on the bolt 100. The flat washer 500 is a circular structure, so the flat washer 500 is sleeved on the bolt 100, thereby preventing the bolt 100 from falling off the fixing member 400. The clamping method in the present embodiment is simple and easy to assemble.

[0044] In a specific embodiment, refer to Figure 4As shown, the flat washer 500 includes a through hole 510 , one end of the bolt 100 passes through the through hole 510 to be connected with the nut 200 , and the through hole 510 is serrated. Specifically, the flat washer 500 includes a through hole 510, one end of the bolt 100 passes through the through hole 510 to be connected with the nut 200, the bolt 100 is clamped with the flat washer 500, and the through hole 510 is designed to be serrated, that is, in this embodiment, on the basis of the through hole 510 being a circular hole, a plurality of notches are evenly and spaced apart along the edge of the circular hole in a direction away from the center of the circular hole, so that the through hole 510 is serrated. Therefore, when installing the flat washer 500, the serrated through hole 510 facilitates the staff to forcefully press the flat washer 500 into the groove 130 or put the flat washer 500 on the bolt 100, thereby reducing the work intensity of the staff. At the same time, due to the serrated structure of the through hole 510, the flat washer 500 is not easy to fall off the bolt 100, thereby avoiding affecting the use of the bolt 100.

[0045] In one embodiment, referring to Figures 1 to 4 As shown, the fastening device further includes a buffer 600, which is sleeved on the bolt 100 and is located between the fixing member 400 and the clamping portion 120. Specifically, the fastening device further includes a buffer 600, which is used to buffer and prevent the appearance surface of the fixing member 400 from being worn; the buffer 600 is sleeved on the bolt 100 and is located between the fixing member 400 and the clamping portion 120, and the two sides of the buffer 600 are respectively in contact with the fixing member 400 and the clamping portion 120, thereby avoiding the friction between the clamping portion 120 and the fixing member 400 to cause the appearance surface of the fixing member 400 to be worn, and at the same time, a buffering effect is provided on the fixed connection between the fixing member 400 and the bolt 100; in this embodiment, the buffer 600 is set to be made of rubber material, and The buffer 600 is an "O"-shaped structure, which facilitates the installation of the buffer 600, that is, the buffer 600 is sleeved on the bolt 100. At the same time, the size of the buffer 600 in this embodiment is larger than the diameter of the opening 410, so that the opening 410 of the fixing member 400 is smaller than the size of the buffer 600. When one end of the bolt 100 passes through the buffer 600, the fixing member 400 and the flat washer 500 respectively, the buffer 600 and the flat washer 500 are located on both sides of the fixing member 400. The buffer 600 can further prevent the fixing member 400 from falling off the bolt 100, thereby improving the structural stability of the fastening device.

[0046] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A fastening device, characterized in that: include: The bolt comprises a bite portion, wherein the bite portion is extended along the axial direction of the bolt; The nut comprises a protrusion, wherein the protrusion is protruded outward from the surface of the nut; A movable member, the movable member being rotatably connected to the raised portion; Wherein, the nut is sleeved on one end of the bolt, the engaging portion is engaged with the nut, and the nut can move along the axial direction of the engaging portion.

2. The fastening device according to claim 1, characterized in that: The nut further comprises a connecting groove and an opening, wherein the connecting groove and the opening are both extended along the axial direction of the nut, the opening connects the connecting groove and the outside, and one end of the bolt is located in the connecting groove.

3. The fastening device according to claim 2, characterized in that: The protrusion includes a plurality of first protrusions, which are correspondingly arranged on both sides of the opening. The movable member includes a plurality of through holes, and each of the first protrusions is respectively embedded in each of the through holes and is rotatably connected to the through holes.

4. The fastening device according to claim 2, characterized in that: The raised portion also includes a second raised portion, which is arranged on the other side of the nut relative to the opening and is raised in a direction away from the opening. The movable part also includes a fixing groove, which is formed by an inward depression on one side of the movable part. The second raised portion is embedded in the fixing groove and is rotatably connected to the fixing groove.

5. The fastening device according to claim 4, characterized in that: The second raised portion is provided with a fixing protrusion, which is protruded outwardly from one side of the second raised portion. The fixing groove includes a fixing portion, which is formed by the groove wall of the fixing groove being recessed inwardly. The fixing protrusion is embedded in the fixing portion and is rotatably connected to the fixing portion.

6. The fastening device according to claim 1, characterized in that: The other end of the bolt includes a clamping portion, which is convexly arranged along the circumference of the bolt; the fastening device also includes a fixing piece, which includes an opening, and one end of the bolt passes through the opening to enable the clamping portion to be clamped with the fixing piece.

7. The fastening device according to claim 6, characterized in that: The fastening device also includes a flat washer, which is sleeved on the bolt and clamped with the bolt. The flat washer is arranged adjacent to the fixing member and is located on a side of the fixing member away from the clamping portion.

8. The fastening device according to claim 7, characterized in that The bolt further comprises a groove, which is formed by being recessed inwardly along the circumference of the bolt, and the flat washer is clamped in the groove.

9. The fastening device according to any one of claims 7 to 8, characterized in that: The flat washer comprises a through hole, one end of the bolt passes through the through hole and is connected with the nut, and the through hole is serrated.

10. The fastening device according to claim 6, characterized in that The fastening device further comprises a buffer member, which is sleeved on the outer side of the bolt and located between the fixing member and the clamping portion.

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