Anti-loose u-bolt

Abstract

The utility model discloses a kind of anti-loose U-shaped bolts, including U-shaped bolt body and fixed plate, the lower side of fixed plate is provided with extension inner tube outside U-shaped bolt body column foot, extension inner tube is provided with extension outer tube at outside interval, annular cavity is formed between extension inner tube and extension outer tube, spring is vertically provided in annular cavity, pressure plate is provided on spring, nut is provided on U-shaped bolt body column foot, nut is abutted on pressure plate.The utility model cooperates by spring pre-tightening and reverse thread interlocking, constructs dynamic compensation and mechanical blocking double protection system.Spring continuously exerts axial pressure to offset the back tendency caused by vibration;Extension outer tube reverse thread makes two-way resistance moment to be overcome for loosening, significantly improves anti-vibration performance, reduces the risk of equipment failure due to loosening.

Description

Technical Field

[0001] This utility model relates to a U-shaped bolt that prevents loosening. Background Technology

[0002] U-bolts are widely used in mechanical connections, such as pipe fixing, shaft component positioning, and steel structure node fastening. Their core function is to achieve radial constraint on the clamped component through the threaded ends and nuts. However, under dynamic loads, temperature changes, or long-term alternating stress, traditional U-bolts are prone to loosening and failure due to fretting wear and preload decay, leading to equipment displacement and even safety accidents. Utility Model Content

[0003] The main purpose of this utility model is to provide a U-bolt that prevents loosening, so as to solve the problems mentioned in the background art.

[0004] The objective of this utility model can be achieved by adopting the following technical solution:

[0005] A U-bolt designed to prevent loosening includes a U-bolt body and a fixing plate. An extended inner tube is provided on the outside of the base of the U-bolt body below the fixing plate. Extended outer tubes are provided at intervals on the outside of the extended inner tube. An annular cavity is formed between the extended inner tube and the extended outer tube. A spring is vertically arranged inside the annular cavity. A pressure plate is provided on the spring. A nut is provided on the base of the U-bolt body and abuts against the pressure plate.

[0006] Preferably, the free length of the spring is greater than the depth of the annular cavity, so that the pressure plate extends out of the annular cavity.

[0007] Preferably, the inner wall of the extended outer tube is provided with a plurality of guide grooves, and the pressure plate is provided with guide blocks that cooperate with the guide grooves.

[0008] Preferably, four guide grooves are provided, and the four guide grooves are evenly distributed on the inner wall of the extended outer tube along its circumference.

[0009] Preferably, the outer wall of the extended outer tube is provided with external threads, the outer side of the extended outer tube is provided with a protective sleeve, and the inner wall of the protective sleeve is provided with internal threads.

[0010] Preferably, the inner bottom surface of the protective sleeve abuts against the outer side of the nut.

[0011] Preferably, the outer wall of the protective sleeve has a hexagonal structure.

[0012] Preferably, the external thread on the extended outer tube has the opposite direction of rotation to the thread on the U-bolt body column.

[0013] The beneficial technical effects of this utility model are as follows:

[0014] This invention constructs a dual protection system of dynamic compensation and mechanical resistance through the synergistic effect of spring preload and reverse thread interlocking. The spring continuously applies axial pressure to counteract the tendency to recoil caused by vibration; the extended reverse thread of the outer tube requires overcoming a bidirectional resistance torque when loosening, significantly improving vibration resistance and reducing the risk of equipment failure due to loosening. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the U-shaped bolt structure according to an embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of a U-shaped bolt according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the U-bolt (without the protective sleeve) structure according to an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of the U-bolt (without nut) structure according to an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the fixing plate structure of an embodiment of the present utility model.

[0020] In the diagram: 1. U-bolt body; 2. Fixing plate; 3. Extended inner tube; 4. Extended outer tube; 5. Annular cavity; 6. Spring; 7. Pressure plate; 8. Nut; 9. Guide groove; 10. Guide block; 11. Protective sleeve. Detailed Implementation

[0021] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0022] like Figures 1-5 As shown, the anti-loosening U-bolt provided in this embodiment includes a U-bolt body 1 and a fixing plate 2. An extended inner tube 3 is provided on the outside of the column foot of the U-bolt body 1 below the fixing plate 2. An extended outer tube 4 is provided at intervals on the outside of the extended inner tube 3. An annular cavity 5 is formed between the extended inner tube 3 and the extended outer tube 4. A spring 6 is vertically arranged inside the annular cavity 5. A pressure plate 7 is provided on the spring 6. A nut 8 is provided on the column foot of the U-bolt body 1. The nut 8 abuts against the pressure plate 7.

[0023] When nut 8 is tightened, it compresses spring 6. At this time, spring 6 stores elastic potential energy and generates a reaction force that acts on the back of nut 8, reducing the possibility of nut 8 loosening due to external vibration or impact.

[0024] Sudden impact forces are absorbed by spring 6 and converted into deformation energy, preventing instantaneous overload from being directly transmitted to the threads and causing damage. This flexible connection improves the system's impact resistance and further prevents nut 8 from loosening.

[0025] In this embodiment, as Figure 4 As shown, the free length of spring 6 is greater than the depth of the ring cavity 5, causing the pressure plate 7 to extend out of the ring cavity 5. After the nut 8 is assembled, spring 6 always maintains a certain amount of compression, which can continuously apply axial pressure to the nut 8.

[0026] In this embodiment, as Figure 5 As shown, multiple guide grooves 9 are vertically arranged on the inner wall of the extended outer tube 4, and guide blocks 10 that cooperate with the guide grooves 9 are provided on the pressure plate 7 to restrict the pressure plate 7 to move only along the axial direction, eliminate the lateral friction loss caused by the skew, and ensure that the spring force is converted into axial holding force.

[0027] In this embodiment, as Figure 5 As shown, there are four guide grooves 9. The four guide grooves 9 are evenly distributed on the inner wall of the extended outer tube 4 and along its circumference, which improves the guiding effect.

[0028] In this embodiment, as Figure 2 As shown, the outer wall of the extension tube 4 is provided with external threads, and the outer side of the extension tube 4 is provided with a protective sleeve 11. The inner wall of the protective sleeve 11 is provided with internal threads to prevent dust, moisture and other contaminants from entering the internal working area and to improve the service life of the U-bolt.

[0029] In this embodiment, as Figure 2 As shown, the inner bottom surface of the protective sleeve 11 abuts against the outer side of the nut 8, and through the physical barrier, the nut 8 cannot be axially displaced, that is, it cannot be turned, thus further improving the anti-loosening effect.

[0030] In this embodiment, as Figure 1 As shown, the outer wall of the protective sleeve 11 has a hexagonal structure, which makes it easy for workers to twist.

[0031] In this embodiment, as Figure 1 As shown, the external thread on the extension tube 4 and the thread on the U-bolt body 1 have opposite directions of rotation. Since the two threads are opposite, the frictional torque in both directions must be overcome at the same time to loosen the nut 8, which greatly increases the difficulty of loosening.

[0032] In summary, this embodiment utilizes the synergistic effect of spring 6 preload and reverse thread interlocking to construct a dual protection system of dynamic compensation and mechanical blocking. Spring 6 continuously applies axial pressure to counteract the tendency to retract due to vibration; the reverse thread of the extended outer tube 4 requires overcoming a bidirectional resistance torque before loosening, significantly improving vibration resistance and reducing the risk of equipment failure due to loosening.

[0033] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A U-bolt for preventing loosening, characterized in that: The device includes a U-bolt body (1) and a fixing plate (2). An extended inner tube (3) is provided on the outside of the column foot of the U-bolt body (1) below the fixing plate (2). An extended outer tube (4) is provided at intervals on the outside of the extended inner tube (3). An annular cavity (5) is formed between the extended inner tube (3) and the extended outer tube (4). A spring (6) is vertically provided inside the annular cavity (5). A pressure plate (7) is provided on the spring (6). A nut (8) is provided on the column foot of the U-bolt body (1). The nut (8) abuts against the pressure plate (7).

2. The anti-loosening U-bolt according to claim 1, characterized in that: The free length of the spring (6) is greater than the depth of the annular cavity (5), causing the pressure plate (7) to extend out of the annular cavity (5).

3. The anti-loosening U-bolt according to claim 1, characterized in that: Multiple guide grooves (9) are vertically arranged on the inner wall of the extended outer tube (4), and a guide block (10) is provided on the pressure plate (7) to cooperate with the guide grooves (9).

4. The anti-loosening U-bolt according to claim 3, characterized in that: The guide groove (9) is provided in four parts, and the four guide grooves (9) are evenly distributed on the inner wall of the extension tube (4) along its circumference.

5. The anti-loosening U-bolt according to claim 1, characterized in that: The outer wall of the extended outer tube (4) is provided with external threads, the outer side of the extended outer tube (4) is provided with a protective sleeve (11), and the inner wall of the protective sleeve (11) is provided with internal threads.

6. The anti-loosening U-bolt according to claim 5, characterized in that: The inner bottom surface of the protective sleeve (11) abuts against the outer side of the nut (8).

7. The anti-loosening U-bolt according to claim 5, characterized in that: The outer wall of the protective sleeve (11) has a hexagonal structure.

8. The anti-loosening U-bolt according to claim 5, characterized in that: The external thread on the extended outer tube (4) is opposite in direction to the thread on the base of the U-bolt body (1).

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