Expansion bolt with adjustable pre-tightening force

Abstract

The utility model discloses an expansion bolt capable of adjusting pretightening force, which relates to the technical field of bolts and comprises a threaded rod, the middle of the threaded rod is in threaded connection with an adjusting nut, the bottom of the threaded rod is sleeved with an expansion pipe, the top of the expansion pipe is sleeved with a limiting ring, one side of the limiting ring is provided with a scale plate, and the other side of the limiting ring is provided with a screw rod. An arc-shaped positioning plate is fixedly arranged on one side of the threaded rod, a limiting assembly for limiting the adjusting nut is arranged at the top of the threaded rod, a conical head is fixedly arranged at the bottom end of the threaded rod, and the maximum outer diameter of the conical head is larger than the inner diameter of the expansion pipe; the utility model has the beneficial effects that the expansion amount of the expansion pipe can be accurately controlled by observing the moving distance of the arc-shaped positioning plate on the surface of the threaded rod and combining with the arranged scale plate, so that the pretightening force is adjusted, the condition of insufficient or interference pretightening force is avoided, and the use of a user is facilitated.

Description

Technical Field

[0001] This utility model relates to a bolt, and more particularly to an expansion bolt with adjustable preload, belonging to the field of bolt technology. Background Technology

[0002] Expansion bolts are a commonly used fastener, widely used in construction, machinery, power and other fields, to fix objects to concrete, walls and other substrates.

[0003] Traditional expansion bolts typically consist of a threaded rod, an expansion tube, and a nut. During installation, tightening the nut pushes the threaded rod forward, causing the tapered head to expand the expansion tube. The degree of expansion of the expansion tube determines the magnitude of the preload. However, it is difficult to precisely control the preload of traditional expansion bolts during installation, relying entirely on the operator's experience. This can easily lead to insufficient or excessive preload, making them inconvenient to use. Utility Model Content

[0004] The purpose of this utility model is to provide an expansion bolt with adjustable preload to solve the problems mentioned in the background art, such as the difficulty in accurately controlling the preload during installation of traditional expansion bolts, the tendency to rely on experience to result in insufficient or excessive preload, and the inconvenience of use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable preload expansion bolt, comprising a threaded rod, an adjusting nut threadedly connected to the middle of the threaded rod, an expansion tube sleeved at the bottom of the threaded rod, a limiting ring sleeved at the top of the expansion tube, a scale plate on one side of the limiting ring, an arc-shaped positioning plate fixedly provided on one side of the threaded rod, a limiting component for limiting the adjustment nut at the top of the threaded rod, and a tapered head fixedly provided at the bottom end of the threaded rod, the maximum outer diameter of the tapered head being larger than the inner diameter of the expansion tube.

[0006] As a preferred embodiment of this utility model, a first washer is provided between the adjusting nut and the expansion tube, and the first washer is sleeved on the outside of the threaded rod.

[0007] As a preferred embodiment of this utility model, a support plate is fixedly provided on one side of the limiting ring, a vertical plate is fixedly provided on one side of the top of the support plate, and one side of the scale plate is fixedly connected to the middle of one side of the vertical plate.

[0008] As a preferred embodiment of this utility model, the surface of the expansion tube is provided with a plurality of evenly spaced arc-shaped grooves.

[0009] As a preferred embodiment of this utility model, the limiting component includes a limiting nut, which is threadedly connected to the top of the threaded rod, and a support ring is fixedly provided at the bottom of the limiting nut.

[0010] As a preferred embodiment of this utility model, a second washer is provided between the limiting nut and the adjusting nut. The second washer is sleeved on the outside of the threaded rod and is a disc spring washer.

[0011] As a preferred embodiment of this utility model, the surface of the threaded rod and the surface of the expansion tube are both plated with zinc, and the surface of the threaded rod is provided with a positioning groove that moves and cooperates with the arc-shaped positioning plate.

[0012] Compared with related technologies, the adjustable preload expansion bolt provided by this utility model has the following beneficial effects:

[0013] 1. By observing the movement distance of the arc-shaped positioning plate on the surface of the threaded rod, and in conjunction with the set scale plate, the expansion amount of the expansion tube can be precisely controlled, thereby adjusting the magnitude of the preload and avoiding insufficient or excessive preload, making it convenient for users.

[0014] 2. The locking assembly, which uses a disc spring washer in the second washer, has a good anti-loosening effect and can maintain the stability of the preload under conditions such as vibration and temperature changes, thus ensuring the reliability of the connection. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0016] Figure 2 This is the second structural schematic diagram of the present invention;

[0017] Figure 3 This is an exploded structural diagram of the threaded rod of this utility model;

[0018] Figure 4 This is a cross-sectional structural diagram of the expansion tube of this utility model;

[0019] Figure 5 This is an exploded structural diagram of the scale plate of this utility model.

[0020] In the diagram: 1. Threaded rod; 2. Adjusting nut; 3. Expansion tube; 4. Limiting ring; 5. Scale plate; 6. Arc-shaped positioning plate; 7. Limiting assembly; 701. Limiting nut; 702. Support ring; 703. Second washer; 8. Support plate; 9. Vertical plate; 10. First washer; 11. Conical head; 12. Arc-shaped groove. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-5 This utility model provides an adjustable preload expansion bolt, including a threaded rod 1, an adjusting nut 2 threadedly connected to the middle of the threaded rod 1, an expansion tube 3 sleeved at the bottom of the threaded rod 1, a limiting ring 4 sleeved at the top of the expansion tube 3, and a scale plate 5 on one side of the limiting ring 4. By using an arc-shaped positioning plate 6 and the scale plate 5, the expansion amount of the expansion tube 3 can be precisely controlled by observing the movement distance of the arc-shaped positioning plate 6 on the surface of the threaded rod 1, thereby adjusting the magnitude of the preload. An arc-shaped positioning plate 6 is fixedly provided on one side of the threaded rod 1, a limiting component 7 for limiting the adjusting nut 2 is provided at the top of the threaded rod 1, and a conical head 11 is fixedly provided at the bottom end of the threaded rod 1. The maximum outer diameter of the conical head 11 is larger than the inner diameter of the expansion tube 3. By rotating the threaded rod 1, the conical head 11 is moved, thereby compressing and expanding the expansion tube 3.

[0023] The limiting component 7 includes a limiting nut 701, which is threaded to the top of the threaded rod 1. A support ring 702 is fixedly provided at the bottom of the limiting nut 701. A second washer 703 is provided between the limiting nut 701 and the adjusting nut 2. The second washer 703 is sleeved on the outside of the threaded rod 1 and is a disc spring washer. By rotating the limiting nut 701 in conjunction with the second washer 703, the adjusting nut 2 can be locked and limited.

[0024] A first washer 10 is provided between the adjusting nut 2 and the expansion tube 3, and the first washer 10 is sleeved on the outside of the threaded rod 1; the first washer 10 can play the role of preventing loosening and enhancing the stability of the connection.

[0025] A support plate 8 is fixedly provided on one side of the limiting ring 4, and a vertical plate 9 is fixedly provided on one side of the top of the support plate 8. One side of the scale plate 5 is fixedly connected to the middle of one side of the vertical plate 9. The scale plate 5 can be effectively supported by the support plate 8 and the vertical plate 9.

[0026] The surface of the expansion tube 3 is provided with several evenly spaced arc-shaped grooves 12, which facilitates the uniform expansion of the expansion tube 3 under the action of the conical head 11 and ensures uniform distribution of preload.

[0027] Both the surface of the threaded rod 1 and the surface of the expansion tube 3 are coated with a zinc layer. The surface of the threaded rod 1 is fitted with a positioning groove that moves in conjunction with the arc-shaped positioning plate 6. The zinc coating on both the surface of the threaded rod 1 and the surface of the expansion tube 3 forms a dense zinc coating layer. This coating can effectively isolate the threaded rod 1 and the expansion tube 3 from direct contact with air, moisture and corrosive media, improve their corrosion resistance and oxidation resistance, and extend the overall service life of the expansion bolt.

[0028] In use, firstly, a mounting hole adapted to the expansion tube 3 is drilled on the substrate. The expansion tube 3, together with one end of the tapered head 11 of the threaded rod 1, is inserted into the mounting hole. Then, the adjusting nut 2 is rotated, and the adjusting nut 2 moves along the external thread of the threaded rod 1 towards the expansion tube 3. In conjunction with the first washer 10, the expansion tube 3 is pushed towards the tapered head 11. The tapered head 11 gradually enters the expansion tube 3, causing the expansion tube 3 to expand and fit tightly against the wall of the mounting hole, generating a preload.

[0029] During the adjustment process, by observing the movement distance of the arc-shaped positioning plate 6 on the surface of the threaded rod 1, and in conjunction with the set scale plate 5, the expansion amount of the expansion tube 3 can be precisely controlled, thereby adjusting the magnitude of the preload force; finally, tighten the limit nut 701 to cause the second washer 703 to undergo elastic deformation, generating axial preload force, locking the adjusting nut 2 to prevent it from loosening during operation.

[0030] 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. An adjustable preload expansion bolt, comprising a threaded rod (1), characterized in that, The threaded rod (1) is threaded with an adjusting nut (2) in the middle. An expansion tube (3) is fitted at the bottom of the threaded rod (1). A limiting ring (4) is fitted at the top of the expansion tube (3). A scale plate (5) is provided on one side of the limiting ring (4). An arc-shaped positioning plate (6) is fixedly provided on one side of the threaded rod (1). A limiting component (7) for limiting the adjusting nut (2) is provided at the top of the threaded rod (1). A conical head (11) is fixedly provided at the bottom end of the threaded rod (1). The maximum outer diameter of the conical head (11) is greater than the inner diameter of the expansion tube (3).

2. The adjustable preload expansion bolt according to claim 1, characterized in that: A first washer (10) is provided between the adjusting nut (2) and the expansion tube (3), and the first washer (10) is sleeved on the outside of the threaded rod (1).

3. The adjustable preload expansion bolt according to claim 1, characterized in that: A support plate (8) is fixedly provided on one side of the limiting ring (4), and a vertical plate (9) is fixedly provided on one side of the top of the support plate (8). One side of the scale plate (5) is fixedly connected to the middle of one side of the vertical plate (9).

4. The adjustable preload expansion bolt according to claim 1, characterized in that: The surface of the expansion tube (3) is provided with several evenly spaced arc-shaped grooves (12).

5. The adjustable preload expansion bolt according to claim 1, characterized in that: The limiting component (7) includes a limiting nut (701), which is threaded to the top of the threaded rod (1), and a support ring (702) is fixedly provided at the bottom of the limiting nut (701).

6. The adjustable preload expansion bolt according to claim 5, characterized in that: A second washer (703) is provided between the limiting nut (701) and the adjusting nut (2). The second washer (703) is sleeved on the outside of the threaded rod (1). The second washer (703) is a disc spring washer.

7. The adjustable preload expansion bolt according to claim 1, characterized in that: The surface of the threaded rod (1) and the surface of the expansion tube (3) are both plated with zinc. The surface of the threaded rod (1) is provided with a positioning groove that moves and cooperates with the arc-shaped positioning plate (6).

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