Bolt connection structure

Abstract

The utility model discloses a bolt connecting structure, which relates to the technical field of mechanical engineering and comprises a base plate, a connecting plate, a gasket and a high-strength friction type bolt. The substrate is provided with a first through hole; the connecting plate is arranged on the base plate, and a second through hole is formed in the connecting plate; the gasket is arranged on the side, back to the connecting plate, of the base plate and provided with a third through hole. The high-strength friction type bolt sequentially penetrates through the second through hole, the first through hole and the second through hole, and an extrusion sleeve of the high-strength friction type bolt abuts against the gasket; according to the technical scheme provided by the utility model, the stability and safety of connection can be improved, and the pre-tightening force of the high-strength bolt is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical engineering technical field, especially a bolt connection structure. BACKGROUND

[0002] High-strength friction type bolt is the bolt of performance grade above 8.8 level, can bear greater load, is often used between the connection and fixation of board, in prior art, the extrusion sleeve of high-strength friction type bolt is directly contacted with board directly in actual use, this direct contact mode lacks the effect of buffering and stress dispersion, leading to uneven distribution of pre-tightening force or insufficient pre-tightening force, under the working condition of bearing greater load or vibration, high-strength friction type bolt is prone to looseness, and then leading to connection failure. Meanwhile, the extrusion sleeve is directly contacted with board, and the stress concentration phenomenon of contact surface is more serious, and local damage of board is easily caused, which influences the stability and safety of the whole connection structure. CONTENT OF UTILITY MODEL

[0003] The utility model discloses a bolt connection structure, which aims to improve the stability and safety of connection.

[0004] To achieve the above object, the utility model provides a bolt connection structure, which comprises:

[0005] A base plate is provided with a first through hole;

[0006] A connecting plate is arranged on the base plate, and the connecting plate is provided with a second through hole;

[0007] A gasket is arranged on the side of the base plate away from the connecting plate, and the gasket is provided with a third through hole; and

[0008] A high-strength friction type bolt is sequentially arranged in the second through hole, the first through hole and the third through hole, and the extrusion sleeve of the high-strength friction type bolt abuts against the gasket.

[0009] In an embodiment, an inclined abutting surface is formed at the end of the hole wall of the third through hole away from the base plate, and the extrusion sleeve of the high-strength friction type bolt abuts against the inclined abutting surface.

[0010] In an embodiment, the included angle between the inclined abutting surface and the axis of the third through hole is α, and 45°≤α≤60°.

[0011] In an embodiment, a groove is formed on the inclined abutting surface.

[0012] In an embodiment, a plurality of grooves are formed on the inclined abutting surface, and the grooves are arranged at intervals.

[0013] In an embodiment, the gasket is welded to the base plate.

[0014] In an embodiment, the first through hole, the second through hole and the third through hole are coaxially arranged.

[0015] In an embodiment, the first through hole, the second through hole and the third through hole are coaxially arranged.

[0016] In an embodiment, the gasket is made of stainless steel or carbon steel.

[0017] In an embodiment, the high-strength friction bolt comprises a screw rod and a nut, the screw rod is sequentially arranged in the second through hole, the first through hole and the third through hole, the nut is threadedly sleeved on the screw rod and abuts against the connecting plate, and the extrusion sleeve is arranged at an end of the screw rod away from the nut.

[0018] In the technical scheme of the utility model, the gasket is arranged on the side of the base plate away from the connecting plate, so that the extrusion sleeve abuts against the gasket instead of directly abutting against the plate material, stress is effectively dispersed, pre-tightening force is more evenly distributed, damage caused by local stress concentration of the plate material is avoided, and the stability and safety of the connection are significantly improved. Meanwhile, this structure can better adapt to changes in working conditions, reduce loosening caused by vibration or impact, enhance the reliability of the connection, reduce the risk of connection failure, and prolong the service life of the connection structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creative labor.

[0020] Figure 1 The cross-sectional view of the bolt connection structure according to an embodiment of the utility model.

[0021] EXPLANATION OF REFERENCE NUMBERS

[0022] 100, bolt connection structure; 1, base plate; 2, connecting plate; 3, gasket; 31, inclined abutting surface; 4, high-strength friction bolt; 41, extrusion sleeve.

[0023] The implementation, functional characteristics and advantages of the utility model will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0025] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0026] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0027] The utility model provides a bolt connection structure 100.

[0028] Please refer to Figure 1 In an embodiment of the present application, the bolt connection structure 100 includes a base plate 1, a connecting plate 2, a gasket 3 and a high-strength friction type bolt 4; the base plate 1 is provided with a first through hole; the connecting plate 2 is arranged on the base plate 1, and the connecting plate 2 is provided with a second through hole; the gasket 3 is arranged on one side of the base plate 1 away from the connecting plate 2, and the gasket 3 is provided with a third through hole; the high-strength friction type bolt 4 is sequentially arranged in the second through hole, the first through hole and the third through hole, and the extrusion sleeve 41 of the high-strength friction type bolt 4 abuts against the gasket 3.

[0029] In the technical scheme of the utility model, the gasket 3 is arranged on the side of the base plate 1 away from the connecting plate 2, so that the extrusion sleeve 41 abuts against the gasket 3 instead of directly contacting the plate material, stress is effectively dispersed, the pre-tightening force is more evenly distributed, damage caused by local stress concentration of the plate material is avoided, and the stability and safety of the connection are significantly improved. Meanwhile, this structure can better adapt to changes in working conditions, reduce loosening caused by vibration or impact, enhance the reliability of the connection, reduce the risk of connection failure, and prolong the service life of the connection structure.

[0030] Further, in an embodiment of the utility model, please refer to Figure 1 , the hole wall of the third through hole is formed with an inclined abutting surface 31 away from one end of the base plate 1, and the extrusion sleeve 41 of the high-strength friction bolt 4 abuts against the inclined abutting surface 31. The design of the inclined abutting surface 31 makes the contact between the extrusion sleeve 41 and the gasket 3 more closely fitted when the extrusion sleeve 41 expands, and the expansion force can be more effectively and evenly transmitted to the gasket 3, and then dispersed to the base plate 1 through the gasket 3, further reducing the local concentration of the pre-tightening force, making the stress of the entire connection structure more uniform, and improving the reliability of the connection. Through the cooperation of the inclined abutting surface 31 and the extrusion sleeve 41, the pressure of the extrusion sleeve 41 on the gasket 3 can be better dispersed, and then the pressure distribution of the gasket 3 on the base plate 1 is more uniform, effectively avoiding deformation or damage of the base plate 1 caused by excessive local stress, better protecting the base plate 1, and prolonging the service life. The closer fitting between the inclined abutting surface 31 and the extrusion sleeve 41 can increase the friction to a certain extent, reduce the loosening tendency of the high-strength friction bolt 4 under vibration or impact load, enhance the stability of the connection structure, and reduce the risk of connection failure.

[0031] Specifically, in an embodiment of the utility model, the included angle between the inclined abutting surface 31 and the axis of the third through hole is α, and 45°≤α≤60°. When the included angle α is between 45° and 60°, the inclined abutting surface 31 can make the force of the extrusion sleeve 41 on the gasket 3 more reasonably decomposed in the axial and radial directions. The axial component force helps to enhance the pre-tightening effect, and the radial component force can better promote the uniform expansion of the extrusion sleeve 41, so that the pre-tightening force is evenly distributed in a larger range, further reducing the stress concentration phenomenon.

[0032] In order to increase the friction, in an embodiment of the utility model, grooves are formed on the inclined abutting surface 31. The existence of the grooves increases the friction between the inclined abutting surface 31 and the extrusion sleeve 41, so that the high-strength friction bolt 4 is less likely to loosen when subjected to vibration or impact load. The grooves can be linear, curved, helical, etc.

[0033] Further, in an embodiment of the utility model, a plurality of grooves are formed on the inclined abutting surface 31, and the plurality of grooves are arranged at intervals. The arrangement of the plurality of grooves makes the contact between the extrusion sleeve 41 and the inclined abutting surface 31 more dispersed, can more evenly distribute the pressure of the extrusion sleeve 41 on the gasket 3 to each direction, further reduces the local stress concentration, makes the pre-tightening force uniformly transmitted in a larger range, improves the reliability of the connection. And the arrangement of the plurality of grooves makes the connection structure still be able to maintain good performance under different installation angles and stress conditions. At the same time, the shape and distribution of the grooves can produce a certain self-locking effect, further enhance the stability of the connection structure, reduce the risk of connection failure.

[0034] In order to ensure the stability of the connection, in an embodiment of the utility model, the gasket 3 is welded with the base plate 1. The welding connection makes the gasket 3 and the base plate 1 become a whole, enhances the connection strength and rigidity between the two. This stable connection can more effectively transmit the pre-tightening force generated by the high-strength friction bolt 4 to the base plate 1, reduces the uneven distribution of the pre-tightening force caused by the gap or looseness between the gasket 3 and the base plate 1, further improves the reliability of the connection. The welding connection fixes the position of the gasket 3, avoids the displacement or inclination of the gasket 3 due to external force during installation or use, ensures that the extrusion sleeve 41 always maintains good contact with the inclined abutting surface 31 of the gasket 3, maintains the uniform distribution of the pre-tightening force and the stability of the connection.

[0035] Specifically, in an embodiment of the utility model, the first through hole, the second through hole and the third through hole are all circular holes, and the first through hole, the second through hole and the third through hole are coaxially arranged. The coaxially arranged circular holes make the high-strength friction bolt 4 more smooth and centered during threading, ensuring that the extrusion sleeve 41 and the inclined abutting surface 31 of the gasket 3 can be uniformly stressed.

[0036] Further, in an embodiment of the utility model, the inner diameter of the first through hole, the inner diameter of the second through hole and the inner diameter of the third through hole are equal. The equal inner diameters of the through holes make the high-strength friction bolt 4 more smooth and centered during threading, ensuring that the extrusion sleeve 41 and the inclined abutting surface 31 of the gasket 3 can be uniformly stressed. This uniform force transmission can further reduce the local concentration of the pre-tightening force, make the pre-tightening force more evenly distributed between the base plate 1, the connecting plate 2 and the gasket 3, improve the reliability and stability of the connection. And the equal inner diameters of the through holes make the cooperation between the high-strength friction bolt 4 and each component more tight, reduce the relative displacement and shaking between each component under vibration or impact load, thereby effectively reducing the risk of connection loosening, enhancing the stability and anti-vibration performance of the connection structure.

[0037] In order to meet the use requirements, in an embodiment of the utility model, the material of the gasket 3 is stainless steel or carbon steel. Stainless steel has excellent corrosion resistance, can maintain good performance in humid, acid and alkali and other harsh environments, is not easy to rust and be corroded, prolongs the service life of the gasket 3, and ensures the long-term reliability of the connecting structure. Carbon steel has good mechanical processing performance and mechanical properties, and can further improve its strength and hardness through heat treatment and other methods, meet the use requirements under different working conditions, and ensure the reliability and stability of the connecting structure. Whether the gasket 3 is made of stainless steel or carbon steel, it can provide stable support and close contact for the high-strength friction type bolt 4, optimize the distribution of pre-tightening force, reduce stress concentration, and enhance the overall performance of the connecting structure.

[0038] Specifically, in an embodiment of the utility model, the high-strength friction type bolt 4 includes a screw rod and a nut, the screw rod is sequentially arranged in the second through hole, the first through hole and the third through hole, the nut is threadedly sleeved on the screw rod and abuts against the connecting plate 2, and the extrusion sleeve 41 is arranged at one end of the screw rod away from the nut. Through the threaded cooperation of the screw rod and the nut, the pre-tightening force of the high-strength friction type bolt 4 can be accurately controlled. During installation, by tightening the nut, the pre-tightening force can be gradually increased, so that uniform and sufficient pressure is achieved between the extrusion sleeve 41 and the inclined abutting surface 31 of the gasket 3, thereby optimizing the distribution of the pre-tightening force between the base plate 1, the connecting plate 2 and the gasket 3.

[0039] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A bolted joint structure, characterized by, The utility model relates to a high-strength friction type bolt connection structure, including: a substrate provided with a first through hole; a connecting plate provided on the substrate, the connecting plate being provided with a second through hole; a gasket provided on the side of the substrate away from the connecting plate, the gasket being provided with a third through hole; and a high-strength friction type bolt sequentially provided in the second through hole, the first through hole and the third through hole, the extrusion sleeve of the high-strength friction type bolt being in abutment with the gasket.

2. The bolted joint structure of claim 1, wherein An inclined abutment surface is formed on the end of the hole wall of the third through hole away from the substrate, and the extrusion sleeve of the high-strength friction type bolt is in abutment with the inclined abutment surface.

3. The bolted joint structure of claim 2, wherein, The angle between the inclined abutment surface and the axis of the third through hole is alpha, and 45°≤alpha≤60°.

4. The bolted joint structure of claim 2, wherein A groove is formed on the inclined abutment surface.

5. The bolted joint structure of claim 4, wherein, A plurality of grooves are formed on the inclined abutment surface, and the grooves are arranged at intervals.

6. The bolted joint structure of any one of claims 1 to 5, wherein, The gasket is welded to the substrate.

7. The bolted joint structure of any one of claims 1 to 5, wherein The first through hole, the second through hole and the third through hole are all circular holes, and the first through hole, the second through hole and the third through hole are coaxially arranged.

8. The bolted joint structure of claim 7, wherein, The inner diameter of the first through hole, the inner diameter of the second through hole and the inner diameter of the third through hole are equal.

9. The bolted joint structure of any one of claims 1 to 5, wherein, The material of the gasket is stainless steel or carbon steel.

10. The bolted joint structure of any one of claims 1 to 5, wherein, The high-strength friction type bolt comprises a screw rod and a nut, the screw rod is sequentially provided in the second through hole, the first through hole and the third through hole, the nut is threadedly sleeved on the screw rod and is in abutment with the connecting plate, and the extrusion sleeve is arranged on the end of the screw rod away from the nut.

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