Anti-loosening fastening component

Abstract

The present invention relates to the field of fasteners, and discloses an anti-loosening fastening assembly, comprising a bolt and a nut, wherein the bolt comprises a head and a screw rod, the head rod is provided with a dustproof driving part, the dustproof driving part comprises a driving groove with a non-circular cross-section arranged on the head rod, and a dustproof block which is elastically and telescopically arranged and can block the driving groove and be flush with the end face of the head rod or expose the driving groove, a containing groove is arranged inside the screw rod, and a matching groove which is recessed along the axial direction of the screw rod side wall and is connected with the containing groove, a telescopic part which is elastically and telescopically arranged in the containing groove and is plugged and matched with the matching groove, a plurality of limit blocks are elastically and telescopically arranged at intervals along the axial direction of the screw rod at one end of the telescopic part away from the containing groove, a linkage mechanism which can realize synchronous extension and contraction of the telescopic part with the contraction of the dustproof block and can realize extension and reset of the telescopic part with extension and reset of the dustproof block is arranged between the telescopic part and the dustproof block, the fastening assembly has dustproof and anti-loosening functions, and is convenient for disassembly, assembly and operation.

Description

Technical Field

[0001] The invention relates to the field of fasteners, and in particular to an anti-loosening fastening assembly. Background Art

[0002] Bolts and nuts are common fastening components, which are generally relatively stable after being tightened. However, if the fastened workpiece is in vibration for a long time, there will be a difference in vibration frequency between the connecting parts, which will cause a certain displacement of the connecting parts in the connection structure, causing the nuts and bolts to loosen. For example, when a train passes over the track at a certain speed, the fastening bolts and nuts on the track will vibrate, causing both to loosen, requiring maintenance personnel to perform regular maintenance and inspections.

[0003] The Chinese patent with announcement number CN112879415A discloses a card-type anti-loosening fastening component, including a screw, a nut and a card-tooth seat, the screw is provided with an external thread and a tooth groove, the inner ring wall of the nut is provided with an internal thread and a card seat groove, the card seat groove is arranged at the non-edge position of the inner ring wall, the card-tooth seat is composed of a card tooth and a card seat plate, the card tooth is fixedly installed or directly generated on the card seat plate to form a card-tooth seat, and the card seat plate is connected to the groove bottom of the card seat groove by an elastic material. When the nut is screwed into the screw, due to the action of the elastic material and the front inclined side surface of the card tooth top position, the card tooth seat will move toward the inside of the card seat groove after being squeezed, so that the card tooth is separated from the tooth groove, and then the nut is screwed in smoothly. When the nut is screwed out in the opposite direction, due to the action of the vertical side surface at the rear side of the card tooth top position combined with the elastic material, the card tooth seat will move toward the outside of the card seat groove after being squeezed, so that the card tooth is inserted into the tooth groove and cannot be separated, so that the nut cannot be screwed out.

[0004] In the above patent, the nut can only be tightened in one direction and cannot be loosened. Although it can achieve the effect of preventing loosening, if the fastening component needs to be replaced after a long period of use or the fastening object needs to be replaced, the fastening component needs to be violently destroyed to drive the fastening component to loosen, which causes the problem of inconvenience in disassembly. Summary of the invention

[0005] The present invention aims at the disadvantage that the prior art anti-loosening fastening assembly cannot be loosened after being fastened, and provides an anti-loosening fastening assembly which can be both anti-loosening and quickly disassembled.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] An anti-loosening fastening assembly comprises a bolt and a nut, wherein the bolt comprises a head and a screw rod, and is characterized in that: the head rod is provided with a dustproof driving part, the dustproof driving part comprises a driving groove with a non-circular cross section provided on the head rod and a dustproof block which is elastically and telescopically arranged and can block the driving groove and be flush with the end face of the head rod or expose the driving groove, a receiving groove is provided inside the screw rod, and a matching groove which is connected to the receiving groove is recessed along the axial direction of the screw rod side wall, a telescopic part which is plugged and matched with the matching groove is elastically and telescopically arranged in the receiving groove, a plurality of limit blocks are elastically and telescopically arranged at intervals along the axial direction of the screw rod at one end of the telescopic part away from the receiving groove, and a linkage mechanism is arranged between the telescopic part and the dustproof block;

[0008] When the dust block shrinks toward the inside of the driving groove, the linkage mechanism drives the telescopic part to shrink, and the limit block moves with the telescopic part until the nut can reciprocate in the axial direction of the screw; when the dust block is reset to be flush with the end face of the head, the telescopic part is reset, and the telescopic part extends toward the matching groove, and the limit block moves with the telescopic part and the limit blocks located at both ends of the nut limit the axial reciprocating movement of the nut on the screw, and the limit block facing the inner wall of the nut elastically abuts against the inner wall of the nut.

[0009] The above scheme is adopted, in the fastening assembly of the present scheme, a dustproof driving part is provided on the head of the bolt, and in normal state, the dustproof block is flush with the end of the head, which can prevent dirt from entering the driving groove and play a dustproof role. In normal state, the telescopic part is in an extended state, and since a plurality of limit blocks are provided at the end of the telescopic part, if the nut is located at a certain position of the screw at this time, the limit blocks at both ends of the nut will limit the nut from moving along the axial direction of the screw, and the limit blocks directly facing the inner wall of the nut will elastically abut against the inner wall of the nut, thereby increasing the friction force on the rotation of the nut and reducing the probability of the rotation of the nut. Therefore, the nut is multiply limited, which significantly reduces the risk of the nut detaching. When the dustproof block is pressed to tighten or loosen the nut, the contraction of the dustproof block will drive the linkage mechanism, and then drive the telescopic part to contract, so that the limit block moves synchronously until the nut can move back and forth smoothly on the screw, thereby realizing the locking or unlocking of the workpiece. Therefore, the fastening assembly has the functions of dustproof and anti-loosening, and when rotated by a special tool, it can automatically switch from the anti-loosening mode to the unlocking mode, with a clever structure and convenient operation.

[0010] Preferably, the linkage mechanism includes a mating block protruding from a side of the telescopic part away from the mating groove, a driving bevel groove arranged on the mating block along the axial direction of the screw, and a driving rod protruding from an end of the dustproof block close to the head and mating with the driving bevel groove. As the driving rod approaches the tail of the screw, the driving rod presses against the driving bevel groove and drives the mating block to move to a side away from the mating groove. A first elastic member for driving the telescopic part to be in an extended state is arranged between the mating block and a side of the accommodating groove away from the mating groove.

[0011] By adopting the above scheme, in normal state, the telescopic part is in an extended state under the elastic action of the first elastic part, so that the limit block thereon can limit the movement of the nut; when the dustproof block is pressed, the driving rod fixed to the dustproof block slides along the inclined surface of the driving inclined groove. Since the dustproof block moves along the axial direction of the screw, it will drive the dustproof block to overcome the elastic force of the first elastic part and move in the direction perpendicular to the driving rod, thereby driving the telescopic part to shrink until the limit block and the telescopic block are retracted into the matching groove together, so that the nut can rotate back and forth on the screw.

[0012] Preferably, the cross-sectional shape of the driving groove is a right-angled trapezoid and the end close to the head is the large head end. The inclined surface of the driving groove is located on the side away from the telescopic part. When the dust block is flush with the end face of the head, the driving rod is located on the upslope of the inclined surface.

[0013] Using the above scheme, the driving groove is set into a right-angled trapezoid, the large end of the driving groove is facing the head position, and the inclined surface of the driving groove is located on the side away from the telescopic part. Combined with the above arrangement, when the dustproof block shrinks, the driving rod moves along the shrinkage direction to drive the matching block to move in the direction away from the matching groove, and the telescopic part performs a shrinkage movement.

[0014] Preferably, a plurality of first grooves are arranged at axial intervals along the screw rod on one side of the telescopic portion away from the matching block, a limit block is telescopically arranged in each first groove, and a second elastic member is arranged between the limit block and the bottom of the first groove with both ends fixed to the two.

[0015] By adopting the above scheme, multiple limit blocks are provided and each is individually controlled to extend and retract by a second elastic member. The advantage is that when the nut is in different positions on the screw, there is a limit block that can limit the nut from moving back and forth along the axial direction of the screw and there is a limit block that can elastically abut against the inner wall of the nut when facing the inner wall of the nut to increase the resistance to the rotation of the nut, thereby realizing the function of multiple limit nut deflection and significantly reducing the probability of the nut loosening.

[0016] Preferably, a limiting mechanism is provided between the driving rod and the telescopic part for limiting the telescopic part from being separated from the screw rod when the dust block is flush with the end face of the head. The limiting mechanism includes a yield block protruding from one end of the telescopic part close to the head. The yield block is provided with a yield groove for the driving rod to pass through and for the driving rod to pass through at all times as the telescopic part is extended or retracted.

[0017] By adopting the above scheme and setting of the limiting mechanism, after the dust block is assembled with the head, the driving rod fixed to the dust block passes through the clearance groove and corresponds to the driving inclined groove of the matching block. Therefore, the telescopic part cannot completely escape from the accommodating groove due to the plug-in fit between the clearance block and the driving rod, thereby playing a limiting function.

[0018] Preferably, the matching block is located in the middle of the telescopic portion, the first elastic member is symmetrically arranged on both sides of the matching block, and a recessed groove is provided at the bottom of the driving rod for the first elastic member to pass through.

[0019] By adopting the above solution, the first elastic member is symmetrically arranged on both sides of the matching block, which can improve the telescopic stability of the telescopic part.

[0020] Preferably, the bottom of the driving rod is configured as an extrusion inclined surface that matches the inclined surface of the driving inclined groove.

[0021] By adopting the above solution, an extrusion inclined surface is provided at the bottom of the driving rod, and the extrusion inclined surface is extruded and matched with the inclined surface of the driving inclined groove, which can improve the stability of the movement of the dustproof block.

[0022] Preferably, a third elastic member is provided in the driving groove to drive the dustproof block to an extended state, and a matching structure is provided between the dustproof block and the driving groove to facilitate the introduction of the dustproof block into the driving groove and to limit the maximum extension stroke of the dustproof block to be flush with the end face of the head after the introduction.

[0023] By adopting the above solution, using the matching structure and the third elastic member, the dust block is in the maximum extension stroke under normal conditions, and the maximum extension stroke is flush with the end surface of the head, preventing the dust block from detaching from the head.

[0024] Preferably, the matching structure includes an introduction block elastically and telescopically arranged on both sides opposite the dustproof block, a fourth elastic member driving the introduction block to be in an extended state, and a guide groove recessed along the axial direction of the screw on the inner wall of the driving groove for the introduction block to be inserted and guided to slide, and the side of the introduction block close to the screw is arranged as an introduction slope for facilitating the introduction into the driving groove.

[0025] By adopting the above scheme, the guide block is elastically extended on the side wall of the dust block. During installation, the guide bevel is used to guide it into the drive groove and the second elastic member is used to maintain it in a plug-in and guiding state with the guide groove, thereby limiting the dust block from escaping from the drive groove.

[0026] Preferably, the cross section of the dust-proof block is a regular polygon or an ellipse.

[0027] The present invention has significant technical effects due to the adoption of the above technical scheme: in the anti-loosening fastening assembly, the head of the bolt is provided with a dustproof driving part, and in normal state, the dustproof block is flush with the end of the head, which can prevent dirt from entering the driving groove and play a dustproof role; at the same time, the telescopic part is in an extended state, and since a plurality of limit blocks are provided at the end of the telescopic part, if the nut is located at a certain position of the screw rod at this time, the limit blocks at both ends of the nut will limit the nut from moving along the axial direction of the screw rod, and the limit blocks directly facing the inner wall of the nut will elastically abut against the inner wall of the nut, increasing the screw rod. The friction force exerted on the nut during rotation reduces the probability of the nut rotating. Therefore, the nut is limited in multiple positions, which significantly reduces the risk of the nut detaching. When the dustproof block is pressed to tighten or loosen the nut, the contraction of the dustproof block will drive the linkage mechanism, which in turn drives the telescopic part to contract, allowing the limit block to move synchronously until the nut can move back and forth smoothly on the screw, thereby locking or unlocking the workpiece. Therefore, this fastening assembly has the functions of dustproof and anti-loosening, and when it is rotated using a special tool, it can automatically switch from anti-loosening mode to unlocking mode. It has a clever structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is an axonometric view of an anti-loosening fastening assembly of the present embodiment;

[0029] Figure 2 is a front view of an anti-loosening fastening assembly of this embodiment;

[0030] Figure 3 yes Figure 2 AA cross-sectional view;

[0031] Figure 4 yes Figure 3 A magnified image of A;

[0032] Figure 5 yes Figure 3 A magnified view of B;

[0033] Figure 6 This is a disassembled diagram of an anti-loosening fastening component of this embodiment.

[0034] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. head; 101. drive groove; 102. guide groove; 2. screw; 201. accommodating groove; 3. nut; 4. dust block; 401. second groove; 5. matching groove; 6. telescopic part; 601. first groove; 7. limit block; 8. drive rod; 9. clearance groove; 10. extrusion slope; 11. matching block; 12. drive slope; 13. clearance block; 14. clearance groove; 15. first elastic member; 16. third elastic member; 17. introduction block; 18. introduction slope; 19. fourth elastic member; 20. second elastic member. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0036] An anti-loosening fastening component, referring to Figure 1-Figure 6 As shown, it includes a bolt and a nut 3, the bolt includes a head 1 and a screw 2, the head 1 is provided with a dustproof driving part, the dustproof driving part includes a driving groove 101 with a non-circular cross-section arranged on the side of the head 1 away from the screw 2, and an elastically telescopically arranged dustproof block 4 that can block the driving groove 101 and be flush with the end face of the head 1 or expose the driving groove 101, the cross-section of the driving groove 101 is a regular polygon or an ellipse, and the regular hexagon is adopted in this embodiment. For the convenience of installation, a third elastic member 16 for driving the dustproof block 4 in an extended state is arranged in the driving groove 101, and the third elastic member 16 is a spring, and a matching structure is arranged between the dustproof block 4 and the driving groove 101, which is convenient for the dustproof block 4 to be introduced into the driving groove 101 and limits the maximum extension stroke of the dustproof block 4 to be flush with the end face of the head 1 after the introduction.

[0037] Specific reference Figure 3-Figure 4 As shown, the matching structure includes second grooves 401 recessed on both sides opposite to the dust block 4, an introduction block 17 elastically telescopically arranged in the second groove 401, and a fourth elastic member 19 fixed to the introduction block 17 and the bottom of the second groove 401 at both ends. The fourth elastic member 19 is a spring. A guide groove 102 is recessed along the axial direction of the screw 2 on the inner wall of the driving groove 101 for the introduction block 17 to be inserted and guided to slide. The side of the introduction block 17 close to the screw 2 is arranged as an introduction slope 18 for facilitating the introduction into the driving groove 101. The above-mentioned matching structure can quickly install the dust block 4, and use the fourth elastic member 19 to achieve the effect of flushing the dust block 4 with the end face of the head 1, thereby avoiding dust falling in the driving groove 101 and facilitating the cleaning of the surface of the head 1.

[0038] Combination Figure 3 , Figure 5 and Figure 6As shown, a receiving groove 201 is provided inside the screw 2 along the axial direction of the screw 2, and a matching groove 5 connected to the receiving groove 201 is recessed in the side wall of the screw 2 along its axial direction. A telescopic portion 6 that is plugged and matched with the matching groove 5 is elastically arranged in the receiving groove 201, and a plurality of first grooves 601 are arranged at intervals along the axial direction of the screw 2 at one end of the telescopic portion 6 away from the receiving groove 201. A limiting block 7 is elastically extended in the first groove 601, and a second elastic member 20 is provided between the limiting block 7 and the bottom of the first groove 601 with both ends fixed to the two. The second elastic member 20 is a spring. A linkage mechanism is arranged between the telescopic part 6 and the dustproof block 4. When the dustproof block contracts toward the inside of the driving groove 101, the linkage mechanism drives the telescopic part 6 to contract, and the limit block 7 moves with the telescopic part 6 until the nut 3 can reciprocate in the axial direction of the screw 2; when the dustproof block 4 is reset to be flush with the end face of the head 1, the telescopic part 6 is elastically reset synchronously, and the telescopic part 6 extends toward the matching groove 5. The limit block 7 moves with the telescopic part 6 and the limit blocks 7 located at both ends of the nut 3 limit the axial reciprocating movement of the nut 3 on the screw 2, and the limit block 7 facing the inner wall of the nut 3 elastically abuts against the inner wall of the nut 3.

[0039] Linkage mechanism specific reference Figure 3 As shown, it includes a matching block 11 protruding from the side of the telescopic portion 6 away from the matching groove 5, a driving inclined groove 12 arranged on the matching block 11 along the axial direction of the screw 2, and a driving rod 8 fixedly arranged at one end of the dust block 4 close to the head 1 and matched with the driving inclined groove 12. The cross-sectional shape of the driving groove 101 is a right-angled trapezoid and the end close to the head 1 is the large head end. The inclined surface of the driving groove 101 is located on the side away from the telescopic portion 6. The bottom of the driving rod 8 is arranged as an extrusion inclined surface 10 matched with the inclined surface of the driving inclined groove 12. When the dust block 4 is flush with the end surface of the head 1, the driving rod 8 is located at the upslope of the inclined surface. As the driving The rod 8 approaches the tail end of the screw rod 2, the driving rod 8 presses against the driving inclined groove 12 and drives the matching block 11 to move to the side away from the matching groove 5, and a first elastic member 15 for driving the telescopic part 6 to be in an extended state is arranged between the matching block 11 and the side of the accommodating groove 201 away from the matching groove 5. The first elastic member 15 is a spring, one end of the spring is fixedly connected to the matching block 11 and the other end is elastically abutted with the accommodating groove 201. The matching block 11 is located in the middle of the telescopic part 6, and the first elastic member 15 is symmetrically arranged on both sides of the matching block 11. The bottom of the driving rod 8 is recessed with a makeshift groove 9 for the first elastic member 15 to pass through.

[0040] A limiting mechanism is provided between the driving rod 8 and the telescopic portion 6 to limit the telescopic portion 6 from being separated from the screw rod 2 when the dust block 4 is flush with the end surface of the head 1, as shown in FIG. Figure 3 and Figure 6As shown, the limiting mechanism includes a yield block 13 protruding from one end of the telescopic part 6 close to the head 1, and a yield groove 14 is provided on the yield block 13 for the driving rod 8 to pass through and the driving rod 8 can always pass through it as the telescopic part 6 is extended and retracted. After the dustproof block 4 is assembled with the head 1, the driving rod 8 passes through the yield groove 14 and corresponds to the driving inclined groove 12 of the matching block 11. The telescopic part 6 cannot be completely disengaged from the accommodating groove 201 due to the plug-in cooperation between the yield block 13 and the driving rod 8, thereby playing the function of limiting the telescopic part 6 from being disengaged from the screw rod 2.

[0041] Assembly process:

[0042] 1. Accessory assembly: the limit block 7, the second elastic member 20, the telescopic portion 6, the clearance block 13, the matching block 11 and the first elastic member 15 are welded and assembled to form accessory one; the dustproof block 4, the driving rod 8, the introduction block 17 and the fourth elastic member 19 are welded and assembled to form accessory two; the bolt is accessory three; the nut 3 is accessory four; the third elastic member 16 is accessory five.

[0043] 2. Assembly: first insert the telescopic block into the matching groove 5 of the screw 2, then put the third elastic member 16 into the driving groove 101, further, align the introduction block 17 on the dustproof block 4 with the guide groove 102, and the driving rod 8 passes through the give way groove 14, press the dustproof block 4 until the introduction block 17 is inserted into the guide groove 102.

[0044] Dust-proof principle: In normal state, the dust-proof block 4 is flush with the end of the head 1, which can prevent dirt from entering the driving slot 101 and play a dust-proof role.

[0045] Anti-loosening principle: in normal state, the telescopic part 6 is in an extended state under the action of the first elastic member 15. Since a plurality of limit blocks 7 are provided at the end of the telescopic part 6, if the nut 3 is located at a certain position of the screw rod 2 at this time, the limit blocks 7 at both ends of the nut 3 will limit the nut 3 from moving along the axial direction of the screw rod 2, and the limit blocks 7 facing the inner wall of the nut 3 elastically abut against the inner wall of the nut 3, thereby increasing the friction force exerted on the nut 3 during rotation and reducing the probability of rotation of the nut 3. Therefore, the nut 3 is multiply limited, which significantly reduces the risk of the nut 3 being detached.

[0046] Principle of easy disassembly and assembly: when the dust block 4 is pressed to facilitate the insertion of the tool to tighten or loosen the nut 3, the contraction of the dust block 4 will drive the linkage mechanism, thereby driving the telescopic part 6 to contract, causing the limit block 7 to contract synchronously until the nut 3 can move back and forth smoothly on the screw 2, thereby locking or unlocking the workpiece.

Claims

1. An anti-loosening fastening assembly, comprising a bolt and a nut (3), wherein the bolt comprises a head (1) and a screw rod (2), Features: The head (1) is provided with a dustproof driving part, the dustproof driving part comprising a driving groove (101) with a non-circular cross section provided on the head (1) and a dustproof block (4) which is elastically and telescopically provided and can block the driving groove (101) and is flush with the end surface of the head (1) or exposes the driving groove (101); a third elastic member (16) is provided in the driving groove (101) to drive the dustproof block (4) to be in an extended state; and a dustproof block (4) is provided between the dustproof block (4) and the driving groove (101) to facilitate the dustproof block (4) to be introduced into the driving groove (101) and to limit the dustproof block (4) after the dustproof block (4) is introduced. The maximum extension stroke is a matching structure flush with the end surface of the head (1), a receiving groove (201) is provided inside the screw (2), and a matching groove (5) connected to the receiving groove (201) is recessed along the axial direction of the side wall of the screw (2), a telescopic portion (6) plug-fitting with the matching groove (5) is elastically and telescopically provided in the receiving groove (201), a plurality of limit blocks (7) are elastically and telescopically provided at intervals along the axial direction of the screw (2) at one end of the telescopic portion (6) away from the receiving groove (201), and a linkage mechanism is provided between the telescopic portion (6) and the dustproof block (4); The linkage mechanism comprises a matching block (11) protruding from a side of the telescopic portion (6) away from the matching groove (5), a driving inclined groove (12) provided on the matching block (11) along the axial direction of the screw rod (2), and a driving rod (8) protruding from an end of the dustproof block (4) close to the head (1) and matching with the driving inclined groove (12); as the driving rod (8) approaches the rear end of the screw rod (2), the driving rod (8) presses against the driving inclined groove (12) and drives the matching block (11) to move to a side away from the matching groove (5); and a first elastic member (15) for driving the telescopic portion (6) to be in an extended state is provided between the matching block (11) and a side of the accommodating groove (201) away from the matching groove (5); When the dust block (4) contracts toward the inside of the driving groove (101), the linkage mechanism drives the telescopic part (6) to contract, and the limit block (7) moves with the telescopic part (6) until the nut (3) can reciprocate in the axial direction of the screw rod (2); when the dust block (4) is reset to be flush with the end face of the head (1), the telescopic part (6) is reset, and the telescopic part (6) extends toward the matching groove (5), and the limit block (7) moves with the telescopic part (6) and the limit blocks (7) located at both ends of the nut (3) limit the axial reciprocating movement of the nut (3) on the screw rod (2), and the limit block (7) facing the inner wall of the nut (3) elastically abuts against the inner wall of the nut (3).

2. An anti-loosening fastening assembly according to claim 1, Features: The cross-sectional shape of the driving groove (101) is a right-angled trapezoid, and the end close to the head (1) is the large end. The inclined surface of the driving groove (101) is located on the side away from the telescopic portion (6). When the dust block (4) is flush with the end surface of the head (1), the driving rod (8) is located on the upslope of the inclined surface.

3. An anti-loosening fastening assembly according to claim 2, Features: A plurality of first grooves (601) are arranged at intervals along the axial direction of the screw rod (2) on a side of the telescopic portion (6) away from the matching block (11), a limit block (7) is telescopically arranged in each first groove (601), and a second elastic member (20) is arranged between the limit block (7) and the bottom of the first groove (601) with both ends fixed to the two.

4. An anti-loosening fastening assembly according to claim 3, Features: A limiting mechanism is provided between the driving rod (8) and the telescopic part (6) for limiting the telescopic part (6) from being separated from the screw rod (2) when the dust block (4) is flush with the end surface of the head (1), the limiting mechanism comprising a stop block (13) protruding from one end of the telescopic part (6) close to the head (1), the stop block (13) being provided with a stop groove (14) through which the driving rod (8) can pass and which can always be passed through by the driving rod (8) as the telescopic part (6) is extended or retracted.

5. An anti-loosening fastening assembly according to claim 4, Features: The matching block (11) is located in the middle of the telescopic part (6), the first elastic member (15) is symmetrically arranged on both sides of the matching block (11), and a recessed groove (9) is formed at the bottom of the driving rod (8) for the first elastic member (15) to pass through.

6. An anti-loosening fastening assembly according to claim 5, Features: The bottom of the driving rod (8) is arranged to be an extrusion inclined surface (10) which matches the inclined surface of the driving inclined groove (12).

7. An anti-loosening fastening assembly according to claim 1, Features: The matching structure comprises an introduction block (17) elastically and telescopically arranged on both sides directly opposite to the dust block (4), a fourth elastic member (19) driving the introduction block (17) to be in an extended state, and a guide groove (102) recessed along the axial direction of the screw rod (2) on the inner wall of the driving groove (101) for the introduction block (17) to be inserted and guided to slide, and a side of the introduction block (17) close to the screw rod (2) is provided with an introduction inclined surface (18) for facilitating introduction into the driving groove (101).

8. An anti-loosening fastening assembly according to claim 1, Features: The cross section of the dust-proof block (4) is in the shape of a regular polygon or an ellipse.

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