Self-tightening force fastening bolt

Abstract

The utility model discloses a self-tightening force fastening bolt which comprises a bolt rod, a locking rod and a fastening block, the inside of the bolt rod is of a hollow structure, the locking rod penetrates through the inside of the bolt rod, a groove hole for inserting the fastening block is formed in the top of the bolt rod, a bolt head is arranged below the groove hole, and the outer diameter of the bolt head is larger than that of the bolt head of the bolt rod. A locking ring is arranged on the bottom face of the bolt head, manganese outer sawteeth are arranged on the surface of the locking ring, the manganese outer sawteeth are circularly distributed at the bottom of the locking ring, the locking rod is of a T-shaped structure, a positioning groove is formed in the bottom of the locking rod, and a metal spring is connected to the upper portion of the locking rod in a sleeved mode. The bolt has the advantages that the bolt can be effectively prevented from loosening under vibration or impact, and the effect of maintaining constant pre-tightening force is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, and more specifically, to an improvement of a fastening bolt. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely applied. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, molds, hydraulics, etc. Various fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical industry, meters, and supplies. They are the most widely used basic mechanical parts. Currently, for the problem of loosening of threaded fasteners, generally speaking, there are mainly several methods such as friction prevention of loosening, direct locking, destroying the kinematic pair relationship, and bonding. During long-term use of traditional bolts, due to factors such as vibration and temperature changes, the reliability of the connection part is reduced. To solve this problem, it is usually necessary to regularly check and re-tighten the bolts, which not only increases the maintenance cost but is also difficult to achieve in some cases. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the utility model provides a self-tightening force fastening bolt, which has the advantages of maintaining a constant pre-tightening force to prevent loosening caused by vibration or temperature changes, and further solves the problems of the need for regular inspection and re-tightening of bolts, which increases the maintenance cost.

[0005] (2) Technical Solutions

[0006] To achieve the above advantages of maintaining a constant pre-tightening force to prevent loosening caused by vibration or temperature changes, the specific technical solutions adopted by the utility model are as follows:

[0007] A self-tightening force fastening bolt includes a bolt rod, a locking rod, and a fastening block. The inside of the bolt rod is a hollow structure. The locking rod penetrates through the inside of the bolt rod. A slot for inserting the fastening block is opened at the top of the bolt rod. Below the slot, there is a bolt head. The outer diameter of the bolt head is larger than the bolt head part of the bolt rod. A locking ring is provided on the bottom surface of the bolt head. The surface of the locking ring is provided with manganese external serrations. The manganese external serrations are circularly distributed at the bottom of the locking ring. The locking rod is a T-shaped structure. A positioning groove is opened at the bottom of the locking rod. A metal spring is sleeved on the upper part of the locking rod.

[0008] Furthermore, a positioning platform for limiting the locking rod is provided inside the bolt rod. External threads are provided on the rod body of the bolt rod, and a chamfer is provided around the bottom of the external threads.

[0009] Further, the locking rod and the fastening block are made of one of low-alloy medium-carbon martensite strengthened ultra-high-strength steel, medium-alloy medium-carbon secondary precipitation hardening ultra-high-strength steel, high-alloy medium-carbon Ni-Co ultra-high-strength steel, and ultra-low-carbon maraging hardening ultra-high-strength steel.

[0010] Further, the fastening block is a circular, rectangular or polygonal block, and the shape of the slot is matched with that of the fastening block.

[0011] Further, the outer surfaces of the bolt rod, the locking rod and the fastening block are sprayed with an alumina ceramic coating and a tungsten carbide metal coating.

[0012] Further, at least two groups of positioning slots are provided, and the two groups of positioning slots are arranged horizontally or vertically.

[0013] Further, the spring is made of rust-proof metal material, and the spring is sleeved on the rod body of the fastening rod.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present utility model provides a self-tightening fastening bolt, which has the following beneficial effects:

[0016] By providing a locking ring on the bottom surface of the bolt head, and manganese external serrations are provided on the surface of the locking ring, and the manganese external serrations are circularly distributed at the bottom of the locking ring, the friction between the washer and the connecting member is increased, effectively preventing the bolt from loosening under vibration or impact. When used in cooperation with the fastening block, a block matching the positioning slot needs to be die-cast or stamped into the internal threaded hole of the connecting member. After the bolt head is fixed, the fastening rod is inserted into the bolt rod. Manually rotate the fastening rod until the positioning slot at the bottom of the fastening rod coincides with the block, and then insert and lock the fastening block above the fastening rod, effectively preventing the bolt from loosening under vibration or impact, so as to have the effect of maintaining a constant pre-tightening force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a structural schematic diagram of the present utility model;

[0019] Figure 2 is a bottom view of the present utility model;

[0020] Figure 3 is a top view of the present utility model;

[0021] Figure 4 It is a schematic diagram of the internal structure of the present utility model.

[0022] In the figure: bolt rod 1, locking rod 2, fastening block 3, bolt head 4, positioning groove 5, metal spring 6, slot hole 11, positioning table 12, external thread 13, locking ring 41, manganese external saw teeth 42. Specific embodiments

[0023] To further illustrate the embodiments, the present utility model provides drawings, which are part of the disclosure of the present utility model. They are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0024] According to an embodiment of the present utility model, a self-tightening force fastening bolt is provided.

[0025] Now, the present utility model will be further described in conjunction with the drawings and specific embodiments. As Figures 1-4 shown, a self-tightening force fastening bolt according to an embodiment of the present utility model includes a bolt rod 1, a locking rod 2 and a fastening block 3. The inside of the bolt rod 1 is a hollow structure. The locking rod 2 penetrates through the inside of the bolt rod 1. A slot hole 11 for inserting the fastening block 3 is opened at the top of the bolt rod 1. A bolt head 4 is arranged below the slot hole 11. The outer diameter of the bolt head 4 is larger than the bolt head part of the bolt rod 1. A locking ring 41 is provided on the bottom surface of the bolt head 4. Manganese external saw teeth 42 are opened on the surface of the locking ring 41. The manganese external saw teeth 42 are circularly distributed at the bottom of the locking ring 41. The locking rod 2 is a T-shaped structure. A positioning groove 5 is opened at the bottom of the locking rod 2. A metal spring 6 is sleeved on the upper part of the locking rod 2.

[0026] In one embodiment, a positioning table 12 for limiting the locking rod 2 is arranged inside the bolt rod 1. An external thread 13 is opened on the rod body of the bolt rod 1. A chamfer is provided around the bottom of the external thread 13.

[0027] In one embodiment, the locking rod 2 and the fastening block 3 are made of one of low-alloy medium-carbon martensite-strengthened ultra-high-strength steel, medium-alloy medium-carbon secondary precipitation-hardened ultra-high-strength steel, high-alloy medium-carbon Ni-Co type ultra-high-strength steel, and ultra-low-carbon martensite age-hardened ultra-high-strength steel. Thereby, the overall service strength of the tubing screw can be effectively improved.

[0028] In one embodiment, the fastening block 3 is a circular, rectangular or polygonal block, and the shape of the slot hole 11 matches that of the fastening block 3. The fastening block 3 is inserted and locked above the fastening rod 2, thereby effectively preventing the bolt from loosening under vibration or impact.

[0029] In one embodiment, an alumina ceramic coating and a tungsten carbide metal coating are sprayed on the outer surfaces of the bolt rod 1, the locking rod 2, and the fastening block 3. By providing the alumina ceramic coating and the tungsten carbide metal coating, they have good wear resistance and corrosion resistance, effectively improving the service life.

[0030] In one embodiment, at least two groups of positioning grooves 5 are provided, and the two groups of positioning grooves 5 are arranged horizontally or vertically. It is necessary to die-cast or stamp a block body matching the positioning groove 5 in the internal threaded hole of the connecting piece, and manually rotate the fastening rod 2 until the bottom positioning groove of the fastening rod 2 coincides with the block body.

[0031] In one embodiment, the spring 6 is made of rust-proof metal material, and the spring 6 is sleeved on the rod body of the fastening rod 2.

[0032] Working principle: When this bolt is in use, it mainly relies on the locking ring 41. The outer diameter of the bolt head 4 is larger than the bolt head of the bolt rod 1. The bottom surface of the bolt head 4 is provided with the locking ring 41. The surface of the locking ring 41 is provided with manganese external sawteeth 42. The manganese external sawteeth 42 are circularly distributed at the bottom of the locking ring 41, increasing the friction between the washer and the connecting piece, effectively preventing the bolt from loosening under vibration or impact. When used in cooperation with the fastening block 3, it is necessary to die-cast or stamp a block body matching the positioning groove 5 in the internal threaded hole of the connecting piece. After the bolt head 4 is fixed, the fastening rod 2 is inserted into the bolt rod 1. Manually rotate the fastening rod 2 until the bottom positioning groove of the fastening rod 2 coincides with the block body, and then insert and lock the fastening block 3 above the fastening rod 2, thereby effectively preventing the bolt from loosening under vibration or impact.

[0033] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "setting", "connection", "fixation", "rotation connection", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A self-tightening fastening bolt, characterized in that: It includes a bolt rod (1), a locking rod (2) and a fastening block (3). The inside of the bolt rod (1) is a hollow structure. The locking rod (2) penetrates through the inside of the bolt rod (1). A slot hole (11) for inserting the fastening block (3) is provided at the top of the bolt rod (1). Below the slot hole (11) is provided a bolt head (4). The outer diameter of the bolt head (4) is larger than the bolt head part of the bolt rod (1). A locking ring (41) is provided on the bottom surface of the bolt head (4). Outer manganese serrations (42) are provided on the surface of the locking ring (41). The outer manganese serrations (42) are circularly distributed at the bottom of the locking ring (41). The locking rod (2) is of a T-shaped structure. A positioning groove (5) is provided at the bottom of the locking rod (2). A metal spring (6) is sleeved on the upper part of the locking rod (2).

2. The self-tightening fastening bolt according to claim 1, characterized in that: A positioning platform (12) for limiting the locking rod (2) is provided inside the bolt rod (1). External threads (13) are provided on the rod body of the bolt rod (1). Chamfers are provided around the bottom of the external threads (13).

3. The self-tightening fastening bolt according to claim 1, wherein: The locking rod (2) and the fastening block (3) are made of one of low alloy medium carbon martensite strengthened ultra-high strength steel, medium alloy medium carbon secondary precipitation hardening ultra-high strength steel, high alloy medium carbon Ni-Co type ultra-high strength steel, and ultra-low carbon martensite age hardening ultra-high strength steel.

4. The self-tightening fastening bolt according to claim 1, wherein: The fastening block (3) is a circular, rectangular or polygonal block. The shape of the slot hole (11) matches that of the fastening block (3).

5. The self-tightening fastening bolt according to claim 1, characterized in that: Aluminum oxide ceramic coatings and tungsten carbide metal coatings are sprayed on the exteriors of the bolt rod (1), the locking rod (2) and the fastening block (3).

6. The self-tightening fastening bolt according to claim 1, wherein: At least two groups of positioning grooves (5) are provided. The two groups of positioning grooves (5) are arranged horizontally or vertically.

7. The self-tightening fastening bolt according to claim 1, wherein: The spring (6) is made of rust-proof metal material. The spring (6) is sleeved on the rod body of the fastening rod (2).

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