Metal products pre-embedded bolt anti-loosening structure

Abstract

This utility model belongs to the field of pre-embedded bolt anti-loosening technology, and discloses a pre-embedded bolt anti-loosening structure for metal products. It includes a nut rotatably mounted on the lower outer side of the bolt body, grooves on both sides of the nut, a cotter pin fitted inside the grooves and inserted into the bolt body, a locking washer fixed to the upper surface of the nut, and a shape memory alloy spring washer fixed to the lower surface of the nut. Through the cotter pin, shape memory alloy spring washer, and locking washer, the cotter pin prevents relative rotation of the bolt, nut, and other connecting parts under vibration or external force, ensuring a stable and safe connection. The shape memory alloy spring washer can increase the pressure at the connection point, reduce contact resistance, and suppress heat generation by deforming under temperature changes and other environmental conditions. It can also absorb some energy to reduce vibration amplitude and ensure connection stability. The locking washer restricts the rotation of the nut and bolt.

Description

Technical Field

[0001] This utility model belongs to the field of pre-embedded bolt anti-loosening technology, specifically the pre-embedded bolt anti-loosening structure for metal products. Background Technology

[0002] The background technology of the anti-loosening structure for embedded bolts in metal products is introduced as follows: In many fields such as construction, machinery, and bridges, embedded bolts are widely used to connect metal products with concrete structures or other foundation structures to achieve the functions of fixing and supporting. However, in actual use, embedded bolts are often affected by various factors such as vibration, impact, temperature changes, and load fluctuations, which can cause the bolts to gradually loosen. Loosening of bolts will reduce the strength and stability of the connection, affect the safety and reliability of the entire structure, and may even cause serious safety accidents.

[0003] Meanwhile, a pre-embedded bolt is disclosed (announcement number CN207878663U), comprising a pre-embedded bolt body, one end of which is bent at 90°, and the other end of which is fitted with two spaced-apart positioning plates. An adjusting nut is also installed on the pre-embedded bolt body on the opposite side of the positioning plates. This utility model has a simple structure and is easy to operate and install.

[0004] The aforementioned type of pre-embedded bolt can only improve the reliability and flexibility of bolt force application, but it cannot prevent bolt loosening. As a result, the bolt often loosens gradually due to various factors such as vibration, impact, temperature changes, and load fluctuations, which reduces the strength and stability of the connection and affects the safety and reliability of the entire structure during use.

[0005] Therefore, a structure for preventing loosening of pre-embedded bolts in metal products is proposed to address the above problems. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides a pre-embedded bolt anti-loosening structure for metal products. It features a cotter pin to prevent relative rotation of bolts, nuts, and other connecting parts under vibration or external force, ensuring a stable and safe connection; a shape memory alloy spring washer that can increase the pressure at the connection point, reduce contact resistance, and suppress heat generation through deformation under temperature changes and other environments; it can also absorb some energy to reduce vibration amplitude and ensure connection stability; and a locking washer to restrict the rotation of nuts and bolts.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pre-embedded bolt anti-loosening structure for metal products, including a nut rotatably provided on the lower outer side of the bolt body, grooves opened on the left and right sides of the nut, a cotter pin fitted inside the grooves and inserted through the bolt body, a stop washer fixedly provided on the upper end face of the nut, and a memory alloy spring washer fixedly provided on the lower end face of the nut.

[0008] Preferably, a fixing plate is fixedly provided on the lower end face of the bolt body, and a memory alloy spring washer is fixed to the fixing plate, and a groove is provided on the upper end of the nut.

[0009] By adopting the above technical solutions, the connection stability between bolts and connectors can be enhanced, the shape memory alloy spring washers can better play their anti-loosening role, and the grooves also provide positioning for subsequent component installation.

[0010] Preferably, the outer front and rear ends of the stop washer are fixedly provided with external stop ears, and a total of six external stop ears are provided.

[0011] By adopting the above technical solution, the rotation of the stop washer and nut can be further restricted, the anti-loosening effect can be enhanced, and the reliability of the bolt connection can be ensured.

[0012] Preferably, the inner front and rear sides of the stop washer are fixedly provided with inner stop ears, and the inner stop ears are fixed inside the groove.

[0013] By adopting the above technical solution, the locking washer and the nut can be tightly connected to prevent relative rotation between them and improve the overall anti-loosening performance.

[0014] Preferably, the outer side of the bolt body is provided with a sleeve, and the lower side of the sleeve is in contact with the upper side of the locking washer. The sleeve has a threaded groove inside, and the bolt body rotates inside the threaded groove. A rubber layer is fixedly provided on the outer side of the sleeve.

[0015] By adopting the above technical solution, the bolts can be protected, the connection stability can be increased, and the rubber layer can also absorb vibration energy and reduce the risk of bolt loosening.

[0016] Preferably, a polyvinyl chloride hollow sleeve is fixedly provided on the outer side of the rubber layer, and an anaerobic threaded adhesive filling port is opened in the middle of the front end face of the sleeve.

[0017] By adopting the above technical solution, the sleeve and rubber layer can be further protected, and the friction between the threads can be increased by injecting anaerobic thread-locking adhesive, which can effectively prevent the bolts from loosening.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model utilizes cotter pins, shape memory alloy spring washers, and locking washers. The cotter pins prevent bolts, nuts, and other connecting parts from rotating relative to each other under vibration or external force, ensuring a stable and safe connection. The shape memory alloy spring washers can increase the pressure at the connection point, reduce contact resistance, and suppress heat generation by deforming under conditions such as temperature changes. They can also absorb some energy to reduce the vibration amplitude and ensure connection stability. The locking washers can restrict the rotation of nuts and bolts.

[0020] 2. This utility model utilizes a sleeve, a hollow PVC sleeve, and a rubber layer to reduce wear and enhance corrosion resistance, thereby extending service life. It can also prevent stripping and misalignment of threads, increase the stress surface, and the PVC layer has good insulation and corrosion resistance, which can prevent the bolt from being corroded by external chemicals and reduce the risk of rust and corrosion. The rubber layer, due to its elasticity, can increase the friction between the bolt and the connecting parts, absorb vibration energy, and reduce the impact of vibration on the bolt connection. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the installation structure of the polyvinyl chloride hollow sleeve of this utility model;

[0023] Figure 3 This is a schematic diagram of the installation structure of the shape memory alloy spring washer of this utility model;

[0024] Figure 4 This is a schematic diagram of the installation structure of the column groove of this utility model;

[0025] Figure 5 This is a schematic diagram of the installation structure of the locking washer of this utility model.

[0026] In the diagram: 1. Bolt body; 2. PVC hollow sleeve; 3. Sleeve; 4. Fixing plate; 5. Cotter pin; 6. Nut; 7. Rubber layer; 8. Thread groove; 9. Locking washer; 10. Memory alloy spring washer; 11. External locking lug; 12. Column groove; 13. Groove; 14. Internal locking lug; 15. Anaerobic thread filler. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The following describes an embodiment of this utility model based on its overall structure.

[0029] like Figures 1 to 5 As shown, this utility model provides a structure for preventing loosening of pre-embedded bolts in metal products, including a nut 6 rotatably provided on the lower outer side of the bolt body 1, grooves 12 are provided on the left and right sides of the nut 6, a cotter pin 5 is fitted inside the grooves 12 and the cotter pin 5 passes through the bolt body 1, a stop washer 9 is fixedly provided on the upper end face of the nut 6, and a memory alloy spring washer 10 is fixedly provided on the lower end face of the nut 6 to play a fixing role.

[0030] A fixing plate 4 is fixedly provided on the lower end face of the bolt body 1, and the memory alloy spring washer 10 is fixed to the fixing plate 4. A groove 13 is provided on the upper end of the nut 6 to play a fixing role.

[0031] The outer front and rear ends of the retaining washer 9 are fixed with external retaining ears 11 to play a fixing role, and there are a total of six external retaining ears 11.

[0032] The inner front and rear sides of the retaining washer 9 are fixed with inner retaining ears 14 for fixing, and the inner retaining ears 14 are fixed inside the groove 13.

[0033] The bolt body 1 is provided with a sleeve 3 on the outside for protection, and the lower side of the sleeve 3 is in contact with the upper side of the stop washer 9. The sleeve 3 has a threaded groove 8 inside, and the bolt body 1 rotates inside the threaded groove 8. A rubber layer 7 is fixed on the outside of the sleeve 3 for cushioning.

[0034] A PVC hollow sleeve 2 is fixed on the outside of the rubber layer 7 for protection, and an anaerobic threaded adhesive filling port 15 is opened in the middle of the front end face of the sleeve 3 for filling into the interior.

[0035] Working principle and process of pre-embedded bolt anti-loosening structure in metal products:

[0036] This metal product's pre-embedded bolt anti-loosening structure comprehensively utilizes the characteristics of multiple components to prevent bolt loosening from multiple dimensions. Cotter pins 5, located in the grooves 12 on both sides of the nut 6, penetrate the bolt body 1. When the nut 6 tends to rotate, the cotter pins 5 prevent it from rotating, initially limiting the nut 6's loosening in terms of rotational freedom. A shape memory alloy spring washer 10 is fixed to the lower end face of the nut 6 and connected to the fixing plate 4. Utilizing the characteristics of shape memory alloy, it undergoes elastic deformation under different environmental conditions, continuously applying axial preload to the nut 6, ensuring a tight fit between the nut 6 and the connecting parts, preventing loosening. To prevent loosening, the six outer locking ears 11 on the outer side of the locking washer 9 cooperate with the surrounding structure to further restrict the rotation of the locking washer 9 and the nut 6. The inner locking ears 14 are fixed in the groove 13 at the upper end of the nut 6, making the locking washer 9 and the nut 6 a relatively fixed whole, enhancing the anti-loosening effect. The inner locking ears 14 are fitted onto the outside of the bolt body 1, fitting snugly against the locking washer 9, increasing connection stability and protecting the bolt body 1. They are elastic and cushioning, absorbing vibration energy and reducing the impact of vibration on the bolt connection. The PVC hollow sleeve 2 is on the outside of the rubber layer 7, providing further protection and insulation. The anaerobic threadlocker is injected through the anaerobic threadlocker filling port 15 and cured in the thread groove 8 inside the sleeve 3, increasing the friction between the bolt body 1 and the thread of the sleeve 3 to prevent the bolt from loosening. The bolt body 1 is installed in the pre-embedded position, ensuring that its lower end face is firmly fixed to the fixing plate 4. The nut 6 is rotated and installed on the outer side of the lower end of the bolt body 1 and tightened to a suitable pre-tightening degree. The cotter pin 5 is placed into the groove 12 and inserted through the bolt body 1 to complete the initial anti-loosening positioning. The shape memory alloy spring washer 10 is fixed to the lower end face of the nut 6 and to the fixing plate. 4. Connect the bolt body to a pre-tightened state, fix the locking washer 9 to the upper end face of the nut 6, accurately fix the inner locking ear 14 in the groove 13, and allow the outer locking ear 11 to cooperate with the surrounding related structures. Put the sleeve 3 on the outside of the bolt body 1, so that its lower side fits against the upper side of the locking washer 9. The bolt body 1 rotates in the thread groove 8. Install the rubber layer 7 and the polyvinyl chloride hollow sleeve 2 in sequence on the outside of the sleeve 3. Inject anaerobic threading adhesive: inject anaerobic threading adhesive into the thread groove 8 through the anaerobic threading adhesive filling port 15 and wait for it to cure to further enhance the anti-loosening performance.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal product embedded bolt anti-loosening structure, comprising a bolt body (1), characterized in that: The lower outer side of the bolt body (1) is provided with a nut (6), and the left and right sides of the nut (6) are provided with grooves (12). The grooves (12) are fitted with cotter pins (5), and the cotter pins (5) are inserted into the bolt body (1). The upper end face of the nut (6) is fixed with a stop washer (9), and the lower end face of the nut (6) is fixed with a memory alloy spring washer (10).

2. The metal product lag bolt anti-loosening structure according to claim 1, characterized by: The lower end face of the bolt body (1) is fixed with a fixing plate (4), and the memory alloy spring washer (10) is fixed with the fixing plate (4). The upper end of the nut (6) is provided with a groove (13).

3. The metal product lag bolt anti-loosening structure according to claim 1, characterized by: The outer front and rear ends of the stop washer (9) are fixed with external stop ears (11), and there are a total of six external stop ears (11).

4. The metal product pre-bolted anti-loosening structure according to claim 3, characterized in that: The stop washer (9) has inner stop ears (14) fixed on both the front and rear sides inside, and the inner stop ears (14) are fixed inside the groove (13).

5. The metal article pre-bolted anti-loosening structure according to claim 1, characterized in that: The bolt body (1) is provided with a sleeve (3) on the outside, and the lower side of the sleeve (3) is in contact with the upper side of the stop washer (9). The sleeve (3) is provided with a threaded groove (8) inside, and the bolt body (1) rotates inside the threaded groove (8). A rubber layer (7) is fixedly provided on the outside of the sleeve (3).

6. The metal article pre-bolted anti-loosening structure according to claim 5, characterized in that: A polyvinyl chloride hollow sleeve (2) is fixedly provided on the outside of the rubber layer (7), and an anaerobic threaded adhesive filling port (15) is opened in the middle of the front end face of the sleeve (3).

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