Two-stage anti-loosening expansion bolt

Abstract

The utility model relates to the technical field of bolts, in particular to a two-stage anti-loosening expansion bolt which comprises a screw rod and the like. A thread is arranged at one end of the screw rod, the spring gasket is movably arranged on the screw rod, the end, provided with the thread, of the screw rod penetrates through the spring gasket and is in threaded connection with the nut, and the nut and the screw rod are detachable. The first-stage expansion sleeve and the second-stage self-locking ring are rotationally connected to the end, away from the nut, of the screw rod. Through the design of the second-stage self-locking ring and the first-stage expansion sleeve, multiple fixing means, clamping teeth of the second-stage self-locking ring and the expansion function of the first-stage expansion sleeve are achieved, strong road holding force is provided, it is ensured that the expansion bolt is firmly fixed in a hole, and the problem that a traditional expansion bolt is unstable in anchoring force is effectively solved. Therefore, loosening caused by factors such as vibration is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt technical field especially relates to a two-stage anti-loose expansion bolt. BACKGROUND

[0002] Expansion bolts are fasteners used to secure objects to concrete, brick walls, or other solid substrates. They achieve fixation through a specially designed sleeve and screw rod structure: when the screw rod is screwed in, the sleeve expands outward and presses against the hole wall, forming a stable anchoring point. Expansion bolts are widely used in fields such as building decoration, installation engineering, and are suitable for hanging heavy objects or situations requiring firm fixation.

[0003] Traditional expansion bolts have a simple structure, consisting only of a nut, expansion sleeve, and screw rod. The design relies solely on the expansion sleeve for fixation, which makes the anchoring force dependent on the hardness of the substrate. When faced with low-strength substrates, the device may experience unstable anchoring force, affecting installation effectiveness. Additionally, the simple structure lacks necessary pre-tightening force compensation, making the device prone to loosening and falling out when shaken.

[0004] Therefore, there is a need to design a two-stage anti-loose expansion bolt. SUMMARY

[0005] To overcome the problems of simple structure, unstable anchoring force, and lack of necessary pre-tightening force compensation in traditional expansion bolts, the utility model aims to provide a two-stage anti-loose expansion bolt.

[0006] The technical solution of the utility model is a two-stage anti-loose expansion bolt, which includes a screw rod, a primary expansion sleeve, a secondary self-locking ring, a spring washer, and a nut. The screw rod has a threaded end, and the spring washer is movably arranged on the screw rod. The threaded end of the screw rod passes through the spring washer and is connected with the nut by threading. The nut and the screw rod are detachable. The end of the screw rod away from the nut is rotationally connected with the primary expansion sleeve and the secondary self-locking ring.

[0007] Further, the central axes of the screw rod, the primary expansion sleeve, and the secondary self-locking ring are on the same straight line.

[0008] Further, a clamping groove is provided on the primary expansion sleeve.

[0009] Further, the end of the primary expansion sleeve after expansion is radially arranged.

[0010] Further, a clamping tooth is provided on the secondary self-locking ring.

[0011] Further illustrate that the tooth of the secondary self-locking ring is in contact with the hole wall.

[0012] Further illustrate that the spring washer is butterfly-shaped, and the spring washer is used for providing pre-tightening force.

[0013] Further illustrate that the number of the spring washers is not less than 2, and the spring washers are arranged in a mirror image arrangement.

[0014] Further illustrate that the screw rod is provided with a slope near the primary expansion sleeve and the secondary self-locking ring.

[0015] Further illustrate that the spring washer and the nut are provided with a flat washer.

[0016] The beneficial effects of the utility model are as follows: 1. The utility model discloses a secondary self-locking ring and a primary expansion sleeve, which realize multiple fixing means, the tooth of the secondary self-locking ring and the expansion effect of the primary expansion sleeve provide strong grip, ensure the firm fixing of the expansion bolt in the hole, and effectively solve the problem of unstable anchoring force of the traditional expansion bolt. Thus, loosening caused by vibration and other factors is effectively prevented.

[0017] 2. The utility model discloses a spring washer, which can continuously provide axial pre-tightening force during the operation of the device, can maintain sufficient fastening force even when being used for a long time or being impacted by external force, and not only enhances the stability of the device, but also further improves the anti-loosening capability.

[0018] 3. The utility model discloses a flat washer, which provides necessary protection for the spring washer, prevents the spring washer from being damaged due to excessive extrusion of the nut, prolongs the service life of the spring washer, and indirectly improves the durability and reliability of the entire expansion bolt device. DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0020] Figure 2 It is a three-dimensional structure schematic view of the screw rod and the secondary self-locking ring of the utility model.

[0021] Figure 3 It is a three-dimensional structure schematic view of the screw rod, the primary expansion sleeve and the secondary self-locking ring of the utility model.

[0022] Figure 4 It is a three-dimensional structure schematic view of the spring washer, the flat washer and the nut of the utility model.

[0023] Markings in the drawings: 1-screw rod, 2-primary expansion sleeve, 21-clamping groove, 3-secondary self-locking ring, 31-tooth, 4-spring washer, 5-flat washer, 6-nut. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0025] Example: A two-stage anti-loosening expansion bolt, such as Figures 1-4 As shown, it includes a screw 1, a primary expansion sleeve 2, a secondary self-locking ring 3, a spring washer 4, and a nut 6. One end of the screw 1 is threaded, and the spring washer 4 is movably mounted on the screw 1. The threaded end of the screw 1 passes through the spring washer 4 and is threadedly connected to the nut 6. The nut 6 is detachable from the screw 1. The end of the screw 1 away from the nut 6 is rotatably connected to the primary expansion sleeve 2 and the secondary self-locking ring 3. The central axes of the screw 1, the primary expansion sleeve 2, and the secondary self-locking ring 3 are all located on the same straight line. Here, the primary expansion sleeve 2 has a groove 21. After the primary expansion sleeve 2 expands, one end is radial. The secondary self-locking ring 3 has a locking tooth 31, which contacts the hole wall.

[0026] like Figure 1 and Figure 4 As shown, the spring washer 4 is a butterfly spring washer used to provide preload. There are no fewer than two spring washers 4, and the multiple spring washers 4 are arranged in a mirror image. Here, the design of the spring washer 4 can continuously provide axial preload during the operation of the device, prevent the expansion bolts from loosening due to vibration, and further improve the stability of the device.

[0027] like Figure 3 As shown, the screw 1 is provided with inclined surfaces near the primary expansion sleeve 2 and the secondary self-locking ring 3. The design of the inclined surfaces can more easily drive the screw 1 into the primary expansion sleeve 2 or the secondary self-locking ring 3, and provide guidance for the primary expansion sleeve 2 or the secondary self-locking ring 3, effectively improving the expansion efficiency of the primary expansion sleeve 2 or the secondary self-locking ring 3.

[0028] like Figure 4 As shown, a flat washer 5 is provided between the spring washer 4 and the nut 6. Here, the flat washer 5 is designed to protect the spring washer 4, prevent the nut 6 from excessively squeezing the spring washer 4 and causing damage to the spring washer 4, and effectively extend the service life of the device.

[0029] The device is an expansion bolt, which has the basic functions of an expansion bolt. When in use, the spring washer 4 and the nut 6 are sleeved on the threaded end of the screw rod 1, then the screw rod 1 is inserted into a predetermined hole until the spring washer 4 contacts the hole, and then the nut 6 is screwed, so that the nut 6 drives the screw rod 1 to move away from the hole through cooperation with the thread on the screw rod 1. The screw rod 1 drives the secondary self-locking ring 3 to move in the moving process. When the secondary self-locking ring 3 moves, the clamping teeth 31 on the secondary self-locking ring 3 are blocked by the hole wall, so that the clamping teeth 31 are folded under the extrusion of the screw rod 1. The clamping teeth 31 of the secondary self-locking ring 3 are clamped into the hole wall, so that the secondary self-locking ring 3 is limited and fixed. At the same time, the screw rod 1 extrudes the primary expansion sleeve 2 in the moving process, the primary expansion sleeve 2 is expanded under the force, and one end of the primary expansion sleeve 2 is radially expanded and abuts against the hole wall, so that the fixing work of the device is realized. The spring washer 4 is deformed under the extrusion of the nut 6 in the screwing process, and then the spring washer 4 continuously provides an axial pre-tightening force by relying on its own characteristics, which increases the anti-loosening ability to a certain extent. Thus, the work is completed.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A two-stage anti-loosening expansion bolt comprising a screw rod (1), characterized in that: Also include a primary expansion sleeve (2), secondary self-locking ring (3), spring washer (4) and nut (6), the screw rod (1) one end is provided with thread, the screw rod (1) on the movable spring washer (4) (4) is set, the screw rod (1) is provided with the thread one end through the spring washer (4) and is connected with the nut (6) with thread, the nut (6) and the screw rod (1) between detachable, the screw rod (1) away from the nut (6) one end rotationally connected with the primary expansion sleeve (2) and the secondary self-locking ring (3).

2. A two-stage check expansion bolt according to claim 1 wherein: The central axis of the screw rod (1), the primary expansion sleeve (2) and the secondary self-locking ring (3) are on the same straight line.

3. A two-stage check expansion bolt according to claim 2, wherein: The primary expansion sleeve (2) is provided with a clamping groove (21).

4. A two-stage check expansion bolt according to claim 3 wherein: The primary expansion sleeve (2) is provided with a clamping groove (21).

5. A two-stage check expansion bolt according to claim 4 wherein: The secondary self-locking ring (3) is provided with a clamping tooth (31).

6. A two-stage check expansion bolt according to claim 5 wherein: The secondary self-locking ring (3) is provided with a clamping tooth (31).

7. A two-stage check expansion bolt according to claim 6 wherein: The secondary self-locking ring (3) is provided with a clamping tooth (31).

8. A two-stage check expansion bolt according to claim 7 wherein: The spring washer (4) is a butterfly spring washer, which is used to provide pre-tightening force.

9. A two-stage check expansion bolt according to claim 8 wherein: The number of spring washers (4) is not less than 2, and the plurality of spring washers (4) are arranged in mirror image.

10. A two-stage check expansion bolt according to claim 9, wherein: The screw rod (1) is provided with a slope near the primary expansion sleeve (2) and the secondary self-locking ring (3). The spring washer (4) and the nut (6) are provided with a flat washer (5).

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