Anti-loosening device for standard knot connecting bolt of tower crane

Abstract

The utility model provides a tower crane standard knot connecting bolt anti-loosing device and relates to the technical field of connecting bolts, a connecting bolt is arranged on the outer wall of a connecting body, a nut is connected to the top of the connecting bolt in a sleeved mode, the anti-loosing device comprises a stress arm and a hollow connecting ring, and the nut is arranged in the connecting ring. A plurality of anti-retreat clamping grooves are formed in the connecting ring, the sharp corner of the nut can be clamped in the anti-retreat clamping grooves, and the stress arm can abut against the outer wall of the connecting body so that the nut can be prevented from retreating and displacing. By arranging the stress arm and the connecting ring, the hexagonal nut at the top of the bolt is arranged in the connecting ring, so that the tip of the hexagonal nut can be clamped in the anti-retreat clamping groove, the hexagonal nut cannot loosen at will, in addition, the stress arm can further make contact with the outer wall of the connecting body, the contact area is increased, the stress can be improved, and the service life of the bolt is prolonged. And the nut, the bolt and the like are further prevented from loosening.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting bolts, in particular to a tower crane standard section connecting bolt anti-loosening device. Background Art

[0002] Due to the frequent tower crane accidents in recent years, the mass deaths and injuries have had a huge impact, bringing instability to society and causing adverse social impacts.

[0003] Domestic and foreign units have continuously optimized and updated the safety supervision system of tower cranes, using comprehensive new technologies such as Internet technology, sensor technology, data acquisition and storage technology, etc., to improve the management level to a certain extent. However, in the actual operation process, it only plays a warning and supervision role, and fails to truly prevent the loosening of the connection bolts of the tower crane standard section.

[0004] In actual inspection, it was found that in the standard section fixed connection bolts, flat washers were not installed at the nuts and bolts. Some added a spring washer on the nut side to prevent the nut from loosening. Some used spring washers, but the spring washers themselves could not withstand strong pre-tightening force. Long-term torque changes would directly crush them. Not only could they not prevent loosening, but they would also cause high-strength bolts with insufficient pre-tightening force to loosen, and even bring safety hazards after the connection fails. In different environments and working conditions, according to the actual operating conditions of the equipment, it is necessary to add a tower crane standard section connection bolt anti-loosening device, which can effectively ensure the safe operation of the tower crane standard section connection bolts under the nominal tightening torque. Utility Model Content

[0005] The utility model aims to provide a tower crane standard section connecting bolt anti-loosening device, which is used to improve the fastening force of the connecting bolts during the connection process, prevent the bolts from loosening, and thus ensure the normal operation of the equipment and extend the service life.

[0006] The utility model is achieved through the following technical scheme: a connecting bolt is arranged on the outer wall of the connecting body, a nut is sleeved on the top of the connecting bolt, an anti-loosening device comprises a force-bearing arm and a hollow connecting ring, the nut is placed in the connecting ring, a plurality of anti-backward slots are arranged in the connecting ring, the sharp corners of the nut can be clamped in the anti-backward slot, and the force-bearing arm can abut against the outer wall of the connecting body to prevent the nut from backing out and displacement.

[0007] In order to better realize the utility model, further, the force-bearing arm and the connecting ring are integrally formed, and the force-bearing arm extends outward along the tangent direction of both sides of the connecting ring to form a water drop shape.

[0008] In order to better realize the utility model, further, the inner wall of the connecting ring is provided with a plurality of anti-backward protrusions, and the plurality of anti-backward protrusions are arranged adjacent to each other on the inner wall of the connecting ring, and an anti-backward groove is formed between two of the anti-backward protrusions.

[0009] In order to better implement the utility model, further, the angle of the anti-backwarding slot is 15 to 25 degrees.

[0010] In order to better realize the utility model, further, there are 18 anti-backward protrusions in the connecting ring, and the angle of the anti-backward slot is 20°.

[0011] In order to better realize the utility model, further, the anti-backwarding protrusion is a semicircular structure.

[0012] In order to better realize the utility model, further, a through hole is provided on the connecting ring, and a fastener is provided on the through hole.

[0013] In order to better implement the utility model, further, it also includes a protective cap, a groove is arranged in the protective cap, the protective cap is arranged on the top of the connecting ring, and the top of the bolt is placed in the groove.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a force-bearing arm and a connecting ring, and the hexagonal nut on the top of the bolt is arranged in the connecting ring, so that part of the sharp corners of the hexagonal nut can be stuck in the anti-backward groove, so that the hexagonal nut will not loosen at will. In addition, the force-bearing arm can also contact the outer wall of the connecting body and increase the contact area, so that it can increase the force, thereby further preventing the nuts, bolts, etc. from loosening. In addition, a through hole and a fastener are provided on the connecting ring. After the connecting ring is sleeved on the hexagonal nut, the connection strength between the connecting ring and the hexagonal nut is further strengthened by the fastener, thereby once again strengthening the effect of preventing loosening. The utility model has a simple structure, is easy to use, and has a significant effect, and has a good market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the present invention. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A disassembly diagram of the anti-loosening device provided by the utility model;

[0018] Figure 2 The structure diagram of the anti-loosening device provided by the utility model Figure 2 ;

[0019] Figure 3 A cross-sectional view of the anti-loosening device provided by the utility model;

[0020] Figure 4 A schematic diagram of the structure of the protective cap provided by the utility model;

[0021] Figure 5 A schematic diagram of the installation portion of the anti-loosening and retreating device provided by the utility model;

[0022] icon:

[0023] 10-load-bearing arm, 20-connecting ring, 21-anti-backwarding slot, 22-anti-backwarding protrusion, 30-fastener, 40-protective cap, 50-nut. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described below in conjunction with the accompanying drawings of the present invention.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Please see Figures 1 to 5 The utility model provides a tower crane standard section connecting bolt anti-loosening device. In the prior art, in the standard section fixed connecting bolt, no flat washers are installed at the bolts and the nut 50. Some of them add a spring washer on the nut 50 side to prevent the nut 50 from loosening and other wrong methods. Some use spring washers, but the spring washers themselves cannot withstand strong pre-tightening forces, and will be directly crushed by long-term torque changes. Not only can they not play a role in preventing loosening, but they will cause high-strength bolts with insufficient pre-tightening forces to loosen, and will also bring safety hazards after connection failure. In order to solve the above technical problems, the utility model sets a standard section connecting bolt anti-loosening device to prevent the bolts from loosening, thereby effectively ensuring the safe operation of the tower crane standard section connecting bolts under the nominal tightening torque.

[0027] This embodiment is explained by taking the application of the connecting bolt anti-loosening device on the connecting bolts of the standard section of a tower crane as an example. In addition to the above application scenarios, it can also be applied to other equipment that requires bolt anti-loosening, and is not limited to the scenarios listed in this embodiment.

[0028] The tower crane standard section connecting bolts are installed on the outer wall of the connecting body, and the outer wall of the connecting body can be the standard section main chord rod. The standard section connecting bolts are arranged on the outer side wall of the standard section main chord rod, such as Figure 5 As shown, a nut 50 is arranged on the top of the connecting bolt, and the nut 50 is selected as a hexagonal nut 50. The anti-loosening device mainly includes a load-bearing arm 10 and a hollow connecting ring 20. During use, the nut 50 is placed in the connecting ring 20, and a plurality of anti-retraction grooves 21 are arranged in the connecting ring 20. Some sharp corners of the nut 50 can be clamped in the anti-retraction grooves 21, so that the nut 50 cannot rotate arbitrarily in the connecting ring 20. In addition, the load-bearing arm 10 is arranged outside the connecting ring 20, and the side wall of the load-bearing arm 10 is horizontal and can fit with the outer side of the main chord, thereby increasing the contact area between the load-bearing arm 10 and the main chord of the standard section, reducing the pressure between the load-bearing arm 10 and the main chord, preventing the load-bearing point of the standard section bolt from being squeezed and deformed, and further preventing the nut 50 from being displaced and withdrawn, ensuring that the preload force is continuously effective, and through the joint action of the connecting ring 20 and the load-bearing arm 10, the nut 50 can be effectively prevented from loosening, thereby tightening the overall connection.

[0029] like Figures 1 to 4 As shown in the figure, the force arm 10 and the connecting ring 20 are integrally formed, and the force arm 10 extends outward along the tangent direction of both sides of the connecting ring 20 to form a water drop shape. During the processing, ordinary steel plates with a length of 80mm*80mm and a thickness of 20mm and above can be selected, and operations such as hole opening and cutting can be performed to form them, and then punching and tapping are performed to remove burrs, etc. The final product has a yield strength of 345Mpa, a tensile strength of 490-620Mpa, and can withstand a maximum torque of 250N.M, which fully meets the tightening torque requirements of the standard section bolts of the tower crane.

[0030] In order to make the device have a better anti-loosening effect, a plurality of anti-backoff protrusions 22 are arranged in the connecting ring 20. The anti-backoff protrusion 22 is semicircular, and an anti-loosening groove is formed between two adjacent anti-backoff protrusions 22. The sharp corner of the hexagonal nut 50 is arranged in the anti-loosening groove. The anti-backoff protrusion 22 is preferably semicircular. Its function is to form an anti-backoff groove 21 with a relatively small angle, so that the difficulty of rotational displacement of the nut 50 is further increased. In this embodiment, it is preferred that there are 18 anti-backoff protrusions 22, and the angle of the anti-backoff groove 21 formed is 20°. If the number of anti-backoff protrusions 22 is reduced, the angle of the corresponding anti-backoff groove 21 will become larger, which is not conducive to tightening. If the number of anti-backoff protrusions 22 is large, it is not conducive to use and installation. Therefore, 18 anti-backoff protrusions 22 are the optimal implementation scheme.

[0031] In order to reinforce the anti-loosening device, a through hole is also opened on the connecting ring 20, and a fastener 30 is arranged on the through hole. The fastener 30 can be a screw or other structure to further strengthen the anti-loosening effect.

[0032] In order to enable the structure of the device to be used in a more complex environment and to have the characteristics of corrosion resistance and rainwater erosion resistance, a protective cap 40 is also provided. A groove is provided inside the protective cap 40, and the protective cap 40 is provided on the top of the connecting ring 20, and the top of the bolt is placed in the groove. The protective cap 40 is used for overall protection and shielding, so as to achieve the purpose of increasing the service life.

[0033] 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 changes or substitutions within the technical scope disclosed by the utility model, which 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 tower crane standard section connecting bolt anti-loosening device, the connecting body outer wall is provided with a connecting bolt, the top of the connecting bolt is sleeved with a nut (50), characterized in that: The anti-loosening device comprises a force-bearing arm (10) and a hollow connecting ring (20), wherein a nut (50) is placed in the connecting ring (20), wherein a plurality of anti-retraction grooves (21) are arranged in the connecting ring (20), wherein the sharp corners of the nut (50) can be retained in the anti-retraction grooves (21), and the force-bearing arm (10) can abut against the outer wall of the connecting body to prevent the nut (50) from being displaced due to thread withdrawal.

2. The tower crane standard section connecting bolt anti-loosening device according to claim 1 is characterized in that: The force-bearing arm (10) and the connecting ring (20) are integrally formed, and the force-bearing arm (10) extends outwards along the tangent direction of both sides of the connecting ring (20) to form a water drop shape.

3. The tower crane standard section connecting bolt anti-loosening device according to claim 2 is characterized in that: The inner wall of the connecting ring (20) is provided with a plurality of anti-retraction protrusions (22), the plurality of anti-retraction protrusions (22) are arranged adjacent to each other on the inner wall of the connecting ring (20), and an anti-retraction groove (21) is formed between two of the anti-retraction protrusions (22).

4. The tower crane standard section connecting bolt anti-loosening device according to claim 3 is characterized in that: The angle of the anti-retraction slot (21) is 15-25°.

5. The tower crane standard section connecting bolt anti-loosening device according to claim 4 is characterized in that: There are 18 anti-retraction protrusions (22) in the connecting ring (20), and the angle of the anti-retraction groove (21) is 20°.

6. The tower crane standard section connecting bolt anti-loosening device according to claim 5, characterized in that: The anti-recession protrusion (22) is in a semicircular structure.

7. The tower crane standard section connecting bolt anti-loosening device according to any one of claims 1 to 6, characterized in that: A through hole is also provided on the connecting ring (20), and a fastener (30) is arranged on the through hole.

8. The tower crane standard section connecting bolt anti-loosening device according to any one of claims 1 to 6, characterized in that: It also comprises a protective cap (40), wherein a groove is arranged in the protective cap (40), the protective cap (40) is arranged on the top of the connecting ring (20), and the top of the bolt is placed in the groove.

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