CN110821938A - An anti-loosening fastening bolt - Google Patents

Abstract

An anti-loosening fastening bolt, one end of the bolt is a threaded section, the other end of the bolt is a bolt head, a transition section is arranged between the bolt head and the threaded section, the circumference of the transition section is provided with a screw hole, and the threaded section is located at one end of the transition section for installation and positioning The plate, the transition section and the positioning plate are connected and fixed by fastening screws and screw holes. The anti-loosening fastening bolt of the invention is simple to manufacture, easy to disassemble, and does not require special tools for installation; it can greatly improve the performance of the entire equipment, reduce the daily maintenance cost of the equipment, has good anti-loosening effect and high reliability; Work efficiency and easy operation.

Description

An anti-loosening fastening bolt

technical field

The invention relates to the technical field of general mechanical accessories.

Background technique

Under static load, the thread used for the connection can meet the self-locking condition, and the friction at the supporting surface such as the head of the nut or bolt also has an anti-loosening effect. Therefore, the connection generally does not automatically loosen. However, under shock, vibration or variable load, or when the temperature changes greatly, the connection will loosen, which will easily cause serious accidents to individual parts or even the entire equipment. Therefore, anti-loosening measures must be considered.

At present, there are many anti-loosening methods for general-purpose threaded fasteners. According to their anti-loosening principles, they can be roughly classified into the following three types: The first is friction-based anti-loosening. In this way, a positive pressure that does not change with the external force is generated between the thread pairs, so as to generate a friction force that can prevent the thread pairs from rotating relative to each other. This positive pressure can be achieved by pressing the thread pair axially or in both directions at the same time. Such as the use of elastic washers, double nuts, self-locking nuts and nylon insert locking nuts. This anti-loosening method is more convenient for disassembly, but in the case of shock, vibration and variable load, the preload force of the bolt will decrease due to relaxation. Causes the threaded connection to loosen and fail.

The second method is mechanical anti-loosening, which directly restricts the relative rotation of the thread pair with a stopper. Such as the use of split pins, serial wires and stop washers. This method makes assembly and disassembly inconvenient, increases the labor intensity of the work, and reduces the work efficiency.

The third method is riveting and punching to prevent loosening. After tightening, punching, welding, bonding and other methods are used to make the threaded pair lose the characteristics of the kinematic pair and the connection becomes an inseparable connection. The disadvantage of this method is that the bolt can only be used once, and the disassembly is very difficult, and the bolt pair must be destroyed before it can be disassembled.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems existing in the traditional method for preventing loosening of threaded fasteners, the present invention provides an anti-loosening fastening bolt.

The technical scheme adopted by the present invention to achieve the above purpose is: an anti-loosening fastening bolt, one end of the bolt is a threaded section, the other end of the bolt is a bolt head, a transition section is provided between the bolt head and the threaded section, and the circumference of the transition section is set There are screw holes, a positioning plate is installed on the threaded section at one end of the transition section, and the transition section and the positioning plate are connected and fixed by fastening screws and screw holes.

The bolt head is a hexagonal head structure.

The transition section has a cylindrical structure.

The fastening screw is a square head long cylindrical end fastening screw.

A gap of 2-3 mm is set between the thread segment and the positioning plate.

The anti-loosening fastening bolt of the invention is simple to manufacture, easy to disassemble, and does not require special tools for installation; it can greatly improve the performance of the entire equipment, reduce the daily maintenance cost of the equipment, has good anti-loosening effect and high reliability; Work efficiency and easy operation.

Description of drawings

FIG. 1 is a front structural view of the anti-loosening fastening bolt of the present invention.

Figure 2 is a bottom view of the structure of the anti-loosening fastening bolt of the present invention.

Fig. 3 is an assembly structure diagram of the anti-loosening fastening bolt of the present invention.

In the figure: 1. Bolt, 2. First workpiece, 3. Second workpiece, 4. Threaded section, 5. Positioning plate, 6. Fastening screw, 7. Transition section, 8. Bolt head.

Detailed ways

The structure of the anti-loosening fastening bolt of the present invention is shown in Figures 1-2. One end of the bolt 1 is a threaded section 4, the other end of the bolt 1 is a bolt head 8, and a transition section 7 is provided between the bolt head 8 and the threaded section 4. A screw hole is provided on the circumference of the segment 7, and a positioning plate 5 is installed on the threaded section 4 at one end of the transition section 7. The transition section 7 and the positioning plate 5 are connected and fixed by tightening screws 6 and screw holes.

The bolt 1 is machined from round steel, one end is machined with a threaded section 4 corresponding to the required connection size, which is used for the connection between two workpieces (the first workpiece 2 and the second workpiece 3), and one end is machined into a hexagonal bolt head 8, which is convenient for common use. The assembly of the tool requires that the cylindrical transition section 7 is machined between the hexagonal bolt head 8 and the threaded section 4, and 6 to 8 screw holes are machined in the circumferential direction of this section. The positioning plate 5 is made of ordinary steel plate and is attached to the workpiece to be fixed, so as to increase the contact area and make the bolt pre-tightening force more uniform. The fastening screw 6 is an ordinary square head long cylindrical end fastening screw, which is installed on the evenly distributed screw holes of the new type of bolt. The threaded section 4 and the positioning plate 5 are assembled to ensure a gap of 2 to 3 mm, and the positioning plate 5 and the bottom surface of the second workpiece 3 are attached. The ground pre-tightening thread segment 4 is placed on the positioning plate 5, and all the pre-tightening force and torque are evenly distributed to each set screw 6 to achieve the effect of anti-loosening and tightening. The assembly structure is shown in Figure 3.

The biggest disadvantage of threaded fasteners is that they are easy to loosen under the action of shock, vibration or variable load, so the problem of vibration loosening has always been the biggest problem for threaded fasteners. The threaded fasteners and anti-loosening methods rely on Its own structure, the workpiece is pre-connected by the threaded section 4 on the bolt and the positioning plate 5, the set screws 6 arranged circumferentially at the end of the bolt evenly pre-tighten the bolt 1, and all pre-tightening forces and torques are equally distributed to each. On the set screw, the bolt is not easy to loosen even under the action of shock, vibration or variable load, so as to achieve the purpose of preventing loosening. When disassembling, it is only necessary to loosen the set screws 6 with small diameters (6-8mm) one by one, and then remove the new bolts 1. No special tools are required, installation and disassembly are convenient, labor intensity is reduced, and work efficiency is improved.

The present invention is described through the embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, in the teachings of this invention, these features and embodiments may be modified to adapt a particular situation and material without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present invention.

Claims (5)

1. An anti-loosening fastening bolt, characterized in that: one end of the bolt (1) is a threaded section (4), the other end of the bolt (1) is a bolt head (8), the bolt head (8) and the threaded section (4) A transition section (7) is arranged between, and the circumference of the transition section (7) is provided with a screw hole, and a positioning plate (5) is installed on the threaded section (4) at one end of the transition section (7), and the transition section (7) and the positioning plate ( 5) are connected and fixed by fastening screws (6) and screw holes. 2 . The anti-loosening fastening bolt according to claim 1 , wherein the bolt head ( 8 ) has a hexagonal head structure. 3 . 3 . The anti-loosening fastening bolt according to claim 1 , wherein the transition section ( 7 ) is a cylindrical structure. 4 . 4. The anti-loose tightening bolt according to claim 1, wherein the tightening screw (6) is a set screw with a square head and a long cylindrical end. 5 . The anti-loosening fastening bolt according to claim 1 , wherein a gap of 2-3 mm is set between the thread section ( 4 ) and the positioning plate ( 5 ). 6 .

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