Large-size bolt installation locking device

Abstract

The utility model provides a large-size bolt installation locking device which comprises a fixing body, the fixing body comprises two parallel and connected clamping parts, the clamping parts are used for clamping the opposite faces of a nut head of a to-be-fixed bolt, and the extending direction of the clamping parts is perpendicular to the axis of the bolt; the stopping structure is a structure which is formed by outwards extending at least one end part of the two clamping parts and is used for abutting against an adjacent fixing element, and the adjacent fixing element comprises a nut head or a pipe body, adjacent to the to-be-fixed bolt, of the hydrostatic clamp. The opposite faces of the bolt heads are clamped through the parallel structures, the stopping structures extend to the adjacent elements, multi-point rigid supporting is formed, when a tightening tool applies force, the bolt heads are self-locked through the combined effect of the clamping parts and the stopping structures, and extra manual fixing is not needed; the clamping part and the bolt head are tightly clamped, shearing force under high torque can be dispersed, a stable counter-acting force transmission path is formed in combination with abutting connection of the stopping structure to adjacent elements, and the risk of tool collapse is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe hydrostatic testing, and particularly relates to a large-size bolt mounting anti-loosening device. BACKGROUND

[0002] In pipe hydrostatic testing, a hydrostatic clamp is used to fix both ends of a pipe body, and a bolt pair is used to lock the clamp. In traditional operation, two people are needed to tighten a large-size bolt: one uses a wrench to tighten the nut, and the other needs to use a tool to fix the bolt head on the other side to prevent it from rotating with the nut. However, this method has significant problems: first, the person fixing the bolt head needs to bear a large torque brought by the force lever, and the tool is easy to break due to uneven force, causing personal danger; and second, the stability is insufficient: the locking force of a large-size bolt is very large, and an ordinary fixing tool (such as a conventional wrench) cannot provide stable counterforce, which easily leads to dispersion of the pre-tightening force and affects the sealing performance. CONTENT OF THE UTILITY MODEL

[0003] In view of the above defects or deficiencies in the prior art, the present application aims to provide a large-size bolt mounting anti-loosening device to realize a bolt anti-loosening device that is specifically used in the scene of hydrostatic testing and has safety and stability. The device comprises:

[0004] A fixing body, which comprises two parallel and connected clamping portions, the clamping portions being used to clamp opposite surfaces of a nut head of a bolt to be fixed, and the extension direction of the clamping portions being perpendicular to the bolt axis.

[0005] A blocking structure, which is formed by outward extension of at least one end of each of the two clamping portions, and is used to abut an adjacent fixing element, the adjacent fixing element comprising a nut head of a hydrostatic clamp adjacent to the bolt to be fixed or a pipe body.

[0006] According to the technical scheme provided by the embodiments of the present application, the blocking structure has a first state and a second state. In the first state, the end of the blocking structure abuts the adjacent fixing element, and forms a rigid constraint through the contact surface of the adjacent fixing element, thereby preventing the nut head of the bolt to be fixed from rotating with the bolt when the bolt is tightened. In the second state, the end of the blocking structure is out of contact with the adjacent fixing element, and the nut head of the bolt to be fixed rotates synchronously with the bolt.

[0007] According to the technical scheme provided by the embodiments of the present application, one end of each of the two clamping portions extends towards the other to form a first limiting portion, and the opening end of each of the two clamping portions is formed to clamp the fixing body into the nut head of the bolt to be fixed, and the opening end of each of the two clamping portions extends outward to form the blocking structure.

[0008] The technical scheme provided by the embodiment of the present application further comprises an adjusting assembly, which is used for adjusting the vertical distance between the two clamping portions to adapt to the nut head of the bolt to be fixed with different sizes.

[0009] The adjusting assembly comprises a threaded rod and threaded holes respectively arranged on the two clamping portions, the threaded rod penetrates through the threaded holes on the two clamping portions, the two threaded holes have opposite rotation directions, and by rotating the threaded rod, the two clamping portions produce displacement in the direction perpendicular to the bolt axis.

[0010] The inner side wall of the clamping portion is provided with an anti-skid structure matched with the profile of the nut head, and the anti-skid structure is at least one of sawtooth, convex point array or elastic friction pad.

[0011] The technical scheme provided by the embodiment of the present application further comprises an auxiliary fixing assembly, which is arranged on the outer side of the clamping portion and is used for connecting the anti-loose device with the surface of the pipe body.

[0012] The auxiliary fixing assembly is a magnetic piece or a clamp buckle, which is used for adsorbing or clamping the anti-loose device on the surface of the pipe body.

[0013] The outer side of the clamping portion is provided with a reinforcing rib, which is distributed along the extension direction of the clamping portion, and the cross-sectional shape is triangular or trapezoidal.

[0014] The length of the clamping portion is 1.8-2.5 times the side length of the nut head, and the extension length of the blocking structure is greater than 1.2 times the height of the nut head.

[0015] In summary, the present application provides a large-size bolt installation anti-loose device, which comprises a fixed body, the fixed body comprises two parallel and connected clamping portions, the clamping portion is used for clamping the opposite surface of the nut head of the bolt to be fixed, and the extension direction of the clamping portion is perpendicular to the bolt axis; the blocking structure is that at least one end of the two clamping portions extends outward to form a structure for abutting the adjacent fixed element, and the adjacent fixed element comprises the nut head adjacent to the bolt to be fixed or the pipe body of the hydrostatic clamp.

[0016] Compared with the prior art, the beneficial effects of the present application are that the clamping part of the present application clamps the bolt head opposite surface through parallel structure, prevents the structure from extending to the adjacent element, forms multi-point rigid support, when the tightening tool exerts force, the bolt head realizes self-locking through the combined action of the clamping part and the prevention structure, without the need for additional manpower to fix, realizing single-person operation and safety improvement; in addition, the close clamping of the clamping part and the bolt head (the direction is perpendicular to the bolt axis) can disperse the shear force under high torque, combined with the abutment of the prevention structure to the adjacent element, forming a stable reaction force transmission path, avoiding the risk of tool collapse; at the same time, the ductility design of the prevention structure can flexibly adapt to different sizes of adjacent elements (such as nuts or pipe bodies of different specifications), suitable for various hydrostatic clamp scenes, improving universality, and the device can also be reused, reducing maintenance frequency and material loss. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The large-size bolt mounting anti-loose device provided by the embodiment of the present application is provided in the structural schematic diagram of the hydrostatic clamp.

[0018] Figure 2 The large-size bolt mounting anti-loose device provided by the embodiment of the present application is provided in the structural schematic diagram of the hydrostatic clamp. Figure 1 The local structure schematic diagram of a part in the embodiment of the present application is provided.

[0019] Figure 3 The large-size bolt mounting anti-loose device provided by the embodiment of the present application is provided in the structural schematic diagram of the hydrostatic clamp.

[0020] The text annotations in the figure represent:

[0021] 1, hydrostatic clamp; 2, bolt to be fixed; 3, fixed body; 31, clamping part; 32, first limiting part; 33, threaded rod; 34, prevention structure. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0024] Embodiment 1

[0025] As mentioned in the background, in view of the problems in the prior art, the present application proposes a large-size bolt mounting anti-loose device, as shown in Figure 1 , comprising:

[0026] The fixing body 3 comprises two parallel and connected clamping portions 31 for clamping opposite surfaces of the nut head of the bolt to be fixed, and the extension direction of the clamping portions 31 is perpendicular to the bolt axis.

[0027] Specifically, at the test site, the staff aligns and precisely clamps the clamping portions 31 of the fixing body 3 to the opposite surfaces of the nut head of the bolt to be fixed. For example, when facing large-size bolts for locking the hydrostatic clamp 1, the clamping portions 31 can tightly clamp the opposite two surfaces of the nut head. The clamping portions 31 are in a long strip shape, and the extension direction thereof is strictly perpendicular to the bolt axis, so that the fixing body 3 can effectively block the rotation of the nut head due to the torsion during the tightening of the bolt.

[0028] The blocking structure 34 is an outward extension of at least one end of the two clamping portions 31, forming a structure for abutting the adjacent fixed element, which comprises the nut head or the pipe body of the hydrostatic clamp 1 adjacent to the bolt to be fixed.

[0029] Principle description: In the hydrostatic test of the pipe, when it is necessary to tighten the large-size bolt to seal the two ends of the pipe, the torsion generated during the tightening of the bolt attempts to rotate the nut head. At this time, the clamping portions 31 of the fixing body 3 fix the nut head firmly by tightly clamping the opposite surfaces of the nut head and by the special design that the clamping portions 31 are perpendicular to the bolt axis. The torsion is transmitted to the clamping portions 31 through the nut head, and the structural design of the clamping portions 31 enables them to withstand and disperse the torsion, preventing the nut head from rotating and ensuring the smooth operation of the bolt tightening.

[0030] Further, the blocking structure 34 has a first state and a second state. In the first state, the end of the blocking structure 34 abuts the adjacent fixed element and forms a rigid constraint with the contact surface of the adjacent fixed element, preventing the nut head of the bolt to be fixed from rotating with the tightening of the bolt. In the second state, the end of the blocking structure 34 is out of contact with the adjacent fixed element, and the nut head of the bolt to be fixed rotates synchronously with the tightening of the bolt.

[0031] Specifically, as shown in FIG. 2, the blocking structure 34 is an outward extension of at least one end of the two clamping portions 31, forming a structure for abutting the adjacent fixed element, which comprises the nut head or the pipe body of the hydrostatic clamp 1 adjacent to the bolt to be fixed. Figure 2As shown, in the first state, when the operator installs the fixing body 3 to the nut head of the bolt to be fixed 2, the end of the blocking structure 34 will extend and abut against the adjacent fixed element. For example, in the working environment of the hydrostatic clamp 1, if the adjacent fixed element is a nut head that has been tightened and fixed in position, the blocking structure 34 will tightly abut against the nut head, and the contact surface of the two forms a rigid constraint. At this time, when another operator uses a wrench to tighten the nut of the bolt to be fixed 2, due to the rigid constraint of the blocking structure 34 and the adjacent fixed element, the fixing body 3 cannot rotate, and the nut head clamped by the fixing body 3 cannot rotate with the bolt tightening. In the second state, during the early preparation stage of the test, if it is necessary to preliminarily adjust the position of the bolt or to synchronize the rotation of the nut head and the bolt for installation, the operator can adjust the position of the fixing body 3 on the bolt or move the relevant components to make the end of the blocking structure 34 disengage from the adjacent fixed element. At this time, the fixing body 3 is no longer rigidly constrained by the adjacent fixed element, and the nut head of the bolt to be fixed 2 can rotate synchronously with the bolt, facilitating the early installation operation.

[0032] Further, one end of the two clamping portions 31 extends towards each other to form a first limiting portion 32, and the opening end of the two clamping portions 31 away from the first limiting portion 32 is used to clamp the fixing body 3 into the nut head of the bolt to be fixed 2, and the opening end of the two clamping portions 31 extends outward to form the blocking structure 34.

[0033] Specifically, the blocking structure 34 extends outward from the opening end and is a continuous whole structure with the clamping portion 31 and the first limiting portion 32, ensuring the stability and continuity of the structure. During the installation link of the pipe hydrostatic test, when the worker clamps the fixing body 3 into the nut head of the bolt to be fixed 2, the first limiting portion 32 first contacts the nut head. For example, at the test site, the worker holds the fixing body 3 and pushes the opening end towards the nut head, and the first limiting portion 32 will abut against the nut head at the appropriate position, determining the depth and position range of the clamping of the fixing body 3, preventing the fixing body 3 from being clamped too deeply or inaccurately. The opening end of the two clamping portions 31 away from the first limiting portion 32 is used to clamp the fixing body 3 into the nut head. The worker only needs to align the opening end with the nut head, and the fixing body 3 can be easily sleeved. The blocking structure 34 extending outward from the opening end extends to the adjacent fixed element, such as the adjacent nut head or the pipe body of the hydrostatic clamp 1, after the fixing body 3 is clamped into the nut head, and plays a role in preventing the nut head from rotating.

[0034] In a preferred embodiment, an adjusting assembly is further included for adjusting the vertical distance between the two clamping portions 31 to adapt to the nut head of the bolt to be fixed 2 of different sizes.

[0035] Further, the adjusting assembly comprises a threaded rod 33 and threaded holes respectively arranged on the two clamping portions 31, the threaded rod 33 penetrates the threaded holes on the two clamping portions 31, and the two threaded holes have opposite rotation directions. By rotating the threaded rod 33, the two clamping portions 31 are displaced towards or away from each other in a direction perpendicular to the axis of the threaded rod.

[0036] Specifically, in the manufacturing process of the pipe hydrostatic testing device, high-precision machine tools are used to process threaded holes (the positions of the threaded holes can be the parts of the clamping portions 31 away from the first limiting portions 32) on the two clamping portions 31, and the rotation directions of the two threaded holes are opposite. As shown in Figure 3 the threaded rod 33 is penetrated into the two threaded holes, and a handle is arranged at one end of the threaded rod 33 for facilitating the rotation of the threaded rod 33 by the operator in the testing site. For example, in actual production, the machining accuracy of the threaded holes is precisely controlled to ensure that the threaded rod 33 can be smoothly rotated in and out. Adjustment operation: in the pipe hydrostatic testing, when the distance between the two clamping portions 31 needs to be adjusted, the operator rotates the threaded rod 33. Due to the opposite rotation directions of the two threaded holes, according to the transmission principle of the threads, when the threaded rod 33 is rotated, the two clamping portions 31 are displaced towards or away from each other in a direction perpendicular to the axis of the threaded rod. For example, when the threaded rod 33 is rotated clockwise, one clamping portion 31 moves to the left and the other clamping portion 31 moves to the right, thereby increasing the distance between the two clamping portions 31; conversely, when the threaded rod 33 is rotated counterclockwise, the two clamping portions 31 move towards each other, thereby reducing the distance. In the testing site, the operator can quickly adjust the distance between the clamping portions 31 by rotating the threaded rod 33 according to the actual size of the nut head.

[0037] The present embodiment greatly improves the universality of the anti-loosening device in the pipe hydrostatic testing scenario, so that it can adapt to the nut heads of a plurality of different sizes of large-size bolts. In the testing process, the anti-loosening device does not need to be frequently replaced due to different bolt specifications, thereby reducing the use cost and improving the testing efficiency.

[0038] When installing different specifications of bolts, the requirement can be met by simple adjustment, avoiding the installation difficulty caused by the mismatch of tools in the traditional operation, improving the work efficiency, and ensuring that the testing can be quickly and smoothly performed.

[0039] In a preferred embodiment, the inner side wall of the clamping portion 31 is provided with an anti-slip structure matching the profile of the nut head, and the anti-slip structure is at least one of a sawtooth pattern, an array of convex points, or an elastic friction pad.

[0040] Specifically, if the nut head is a common hexagon, the anti-slip structure can be designed as a corresponding hexagonal serration, or an array of uniformly distributed convex points, or a layer of elastic friction pad can be pasted. In the test site, when the fixing body 3 is clamped into the nut head, these anti-slip structures will be in close contact with the surface of the nut head. For example, the serration teeth will be embedded in the fine gap on the surface of the nut head, the convex point array will increase the friction with the surface of the nut head, and the elastic friction pad will adaptively fit according to the shape of the nut head, further increasing the friction. During the tightening process of the bolt, the anti-slip structure can effectively prevent the relative sliding between the fixing body 3 and the nut head. The anti-slip structure is arranged on the inner side wall of the clamping part 31 and is tightly connected with the clamping part 31. If it is a serration or a convex point array, it can be directly formed on the inner side wall of the clamping part 31 by machining; if it is an elastic friction pad, it is fixed on the inner side wall of the clamping part 31 by means of glue or the like, so as to ensure that the anti-slip structure does not fall off during use and always maintains close contact with the surface of the nut head.

[0041] In a preferred embodiment, an auxiliary fixing assembly is further included, which is arranged on the outer side of the clamping part 31 and is used to connect the anti-loose device with the surface of the pipe body.

[0042] Further, the auxiliary fixing assembly is a magnetic sheet or a clamp buckle, which is used to attract or clamp the anti-loose device to the surface of the pipe body.

[0043] Specifically, the auxiliary fixing assembly is used to connect the anti-loose device with the surface of the pipe body. When the bolt to be fixed 2 is used to connect the pipe body, the auxiliary fixing assembly plays a role. For example, in the hydrostatic test of the oil pipe, the pipeline is connected by large-size bolts, and the auxiliary fixing assembly can connect the anti-loose device with the surface of the pipe body. If the auxiliary fixing assembly is a magnetic sheet, when the anti-loose device approaches the pipe body (assuming that the pipe body is made of metal material), the magnetic sheet will automatically be attracted to the surface of the pipe body; if it is a clamp buckle, the worker can clamp the clamp buckle on the edge or a specific part of the pipe body, so as to fix the anti-loose device on the surface of the pipe body. In the test site, the staff can select the appropriate auxiliary fixing assembly according to the material and shape of the pipe body for installation. The connection needs to ensure that the auxiliary fixing assembly can stably fix the anti-loose device on the surface of the pipe body during use, even if the pipe body may vibrate slightly due to the internal pressure during the test, the anti-loose device can also be ensured not to be displaced.

[0044] In a preferred embodiment, the outer side of the clamping part 31 is provided with a reinforcing rib, which is distributed along the extension direction of the clamping part 31, and the cross-sectional shape is triangular or trapezoidal.

[0045] Specifically, the reinforcing ribs are located on the outer side of the clamping portion 31 and are tightly connected to it. If it is cast integrally, the reinforcing ribs and the clamping portion 31 are a single structure; if it is welded, the reinforcing ribs are firmly attached to the clamping portion 31 through the weld. This tight connection allows the reinforcing ribs to work together with the clamping portion 31 to jointly withstand external forces. The triangular and trapezoidal cross-sectional shapes have good mechanical properties. In the hydrostatic test of the pipe, when tightening large bolts, the clamping portion 31 will be subjected to large torque and pressure. The presence of the reinforcing ribs can distribute these forces over a larger area, preventing the clamping portion 31 from deforming or being damaged due to excessive local stress. The reinforcing ribs are distributed along the extension direction of the clamping portion 31, providing reinforcement along the entire length of the clamping portion 31 and ensuring that the clamping portion 31 remains stable under stress.

[0046] In a preferred embodiment, the length of the clamping part 31 is 1.8-2.5 times the side length of the nut head, and the extension length of the blocking structure 34 is greater than 1.2 times the height of the nut head.

[0047] Specifically, the clamping part 31 and the blocking structure 34 are important components of the anti-loosening device, and their length design is based on the proportional relationship with the nut head size. A suitable length for the clamping part 31 ensures that the fixing body 3 stably holds the nut head. When the length of the clamping part 31 is within the range of 1.8 to 2.5 times the side length of the nut head, the contact area between the clamping part 31 and the nut head is moderate, providing sufficient clamping force while ensuring ease of installation. Sufficient extension length of the blocking structure 34 ensures that it effectively abuts against adjacent fixing elements, forming a rigid constraint. When the extension length is greater than 1.2 times the height of the nut head, the blocking structure 34 can better contact adjacent fixing elements, thereby effectively preventing the nut head from rotating as the bolt is tightened.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A device for preventing loosening of large-size bolts, characterized in that, include: The fixing body (3) includes two parallel and connected clamping parts (31), which are used to engage the opposite faces of the nut head of the bolt (2) to be fixed, and the extending direction of the clamping parts (31) is perpendicular to the bolt axis. The blocking structure (34) is a structure formed by extending outward from at least one end of the two clamping parts (31) to abut against an adjacent fixing element, the adjacent fixing element including the nut head or pipe body of the hydrostatic clamp (1) adjacent to the bolt (2) to be fixed.

2. The anti-loosening device for large-size bolts according to claim 1, characterized in that: The blocking structure (34) has a first state and a second state. In the first state, the end of the blocking structure (34) abuts against the adjacent fixing element and forms a rigid constraint with the contact surface of the adjacent fixing element, preventing the nut head of the bolt to be fixed (2) from rotating as the bolt is tightened. In the second state, the end of the blocking structure (34) disengages from the adjacent fixing element, and the nut head of the bolt to be fixed (2) rotates synchronously with the bolt.

3. The anti-loosening device for large-size bolts according to claim 1, characterized in that: One end of each of the two clamping portions (31) extends toward each other to form a first limiting portion (32). The side of each of the two clamping portions (31) away from the first limiting portion (32) forms an open end for inserting the fixing body (3) into the nut head of the bolt (2) to be fixed. The open ends of the two clamping portions (31) extend outward to form the blocking structure (34).

4. The anti-loosening device for large-size bolts according to claim 1, characterized in that: It also includes an adjustment component for adjusting the vertical distance between the two clamping parts (31) to accommodate the nut heads of bolts (2) of different sizes to be fixed.

5. The anti-loosening device for large-size bolts according to claim 4, characterized in that: The adjustment assembly includes a threaded rod (33) and threaded holes respectively provided on the two clamping parts (31). The threaded rod (33) passes through the threaded holes on the two clamping parts (31). The two threaded holes have opposite directions of rotation. By rotating the threaded rod (33), the two clamping parts (31) produce opposite or opposite displacements in a direction perpendicular to the bolt axis.

6. The anti-loosening device for large-size bolts according to claim 1, characterized in that: The inner wall of the clamping part (31) is provided with an anti-slip structure that matches the profile of the nut head. The anti-slip structure is at least one of serrated texture, convex array or elastic friction pad.

7. The anti-loosening device for large-size bolts according to claim 1, characterized in that: It also includes an auxiliary fixing component, which is disposed on the outside of the clamping part (31) for connecting the anti-loosening device to the surface of the pipe body.

8. The anti-loosening device for large-size bolts according to claim 7, characterized in that: The auxiliary fixing component is a magnetic absorbing plate or a clamping buckle, used to attract or clamp the anti-loosening device to the surface of the pipe body.

9. The anti-loosening device for large-size bolts according to claim 1, characterized in that: The clamping part (31) is provided with reinforcing ribs on the outside. The reinforcing ribs are distributed along the extension direction of the clamping part (31) and have a triangular or trapezoidal cross-sectional shape.

10. The anti-loosening device for large-size bolts according to claim 1, characterized in that: The length of the clamping part (31) is 1.8-2.5 times the side length of the nut head, and the extension length of the blocking structure (34) is greater than 1.2 times the height of the nut head.

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