Self-locking screw

Abstract

The invention discloses a self-locking screw, which belongs to the technical field of screws and comprises a bolt and a nut, threads are arranged on the outer side of the bolt and the inner side of the nut, the bolt is connected with the nut through the threads, a self-locking device is arranged at the bottom of the bolt, and the self-locking device comprises a fixing frame and a holding frame; the fixing frame is arranged at the bottom of the bolt. The holder is arranged outside the fixing frame. A limiting structure is arranged on the outer side of the fixing frame and can limit the moving direction of the retainer on the fixing frame, the retainer can limit movement of the nut, and it is guaranteed that the nut and the bolt are not loosened in connection. According to the self-locking screw, under the condition that the overall structure and the connecting mode of the bolt and the nut are not changed, the self-locking device is arranged at the bottom of the bolt, and the screw cannot be loosened due to vibration or external force in the using process. And the situation that the self-locking screw needs to be installed through large torque in the installation process, and the self-locking screw is prone to slipping in the disassembly process is avoided.

Description

Technical Field

[0001] The invention relates to a self-locking screw and belongs to the technical field of screws. Background Art

[0002] Screws, also known as screws, screws or screw rods, are a type of fastener that uses the principle of circular rotation of an object's inclined surface and friction to fasten objects and parts. They are widely used in daily life and industrial production. Screws can fix two or more parts together to form a whole. In modern industrial society, most of the scenes that need to be connected or fastened can be fixed with screws.

[0003] Traditional screws may loosen due to vibration or external force during use after being tightened, leading to accidents. In order to avoid the above situation, self-locking screws are usually used for fixing. Self-locking screws are fasteners that can maintain a tightened state without the need for additional anti-loosening measures. Usually, the bolt and nut bodies are improved to increase the tightening force between the bolt and the nut. When the tightening force between the bolt and the nut is too strong; due to its special anti-loosening design, self-locking screws may require greater torque to tighten, which may make it easier to cause thread damage on certain materials (such as cork or plastic); disassembly requires greater force, which can easily cause damage to the screw head or stripping; in applications that require frequent disassembly and assembly, the reusability of self-locking screws may not be as good as ordinary screws, and each disassembly and assembly may affect its self-locking ability; over time, the self-locking and tightening performance of self-locking screws may decrease due to wear, corrosion or temperature changes, reducing their anti-loosening effect. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a self-locking screw, which solves the problems of large tightening torque, easy thread slippage, easy self-locking after long-term use, reduced fastening ability, and repeated disassembly and assembly affecting the self-locking ability of the self-locking screw.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: a self-locking screw, comprising a bolt and a nut, wherein threads are arranged on the outer side of the bolt and the inner side of the nut, the bolt and the nut are connected through the threads, a self-locking device is arranged at the bottom of the bolt, and the self-locking device comprises a fixing frame and a retaining frame; the fixing frame is arranged at the bottom of the bolt, and the retaining frame is arranged at the outer side of the fixing frame; a limiting structure is arranged at the outer side of the fixing frame, the limiting structure can limit the moving direction of the retaining frame on the fixing frame, and the retaining frame can limit the movement of the nut to ensure that the connection between the nut and the bolt is not loose.

[0006] Preferably, a buckle is provided at the bottom of the fixing frame, a slot for accommodating the buckle is provided at the bottom of the bolt, and the fixing frame is fixed to the bottom of the bolt through the buckle.

[0007] Preferably, the number of the buckles is at least 2.

[0008] Preferably, the limiting structure comprises arranged oblique teeth, and the inclined surfaces of the oblique teeth face the top of the fixing frame.

[0009] Preferably, the retaining frame can enter the limiting structure unidirectionally and maintain the position of the retaining frame in the limiting structure.

[0010] Preferably, a removal device is also included.

[0011] Preferably, the dismantling device is provided with dismantling feet at the bottom, and the number of the dismantling feet is the same as the number of the buckles.

[0012] Preferably, a dismantling frame is provided on the back of the buckle, and the dismantling frame can cooperate with the dismantling foot to release the connection between the fixing frame and the bolt.

[0013] The beneficial effects of the present invention are:

[0014] (1) Through the present invention, a self-locking device is provided at the bottom of the bolt, and the self-locking device includes a fixing frame and a retaining frame. The fixing frame can be fixed at the bottom of the bolt; the retaining frame can be connected to the fixing frame, and the top of the retaining frame can be connected to the nut to limit the rotation of the nut. Without changing the overall structure and connection method of the bolt and nut, by providing a self-locking device at the bottom of the bolt, it is achieved that the screw will not loosen due to vibration or external force during use. It avoids the need to use a large torque for the installation of the self-locking screw during the installation process, which may easily cause the self-locking screw to slip during the disassembly process.

[0015] Through the present invention, the connection between the fixing frame and the bolt is connected by means of a buckle, and a disassembly frame is provided on the back of the buckle, and a disassembly device used in conjunction with the disassembly frame is also provided. The disassembly device can be connected to the buckle on the back of the fixing frame to release the connection between the fixing frame and the bolt, replace a new fixing frame, or remove the bolt as a whole. After long-term use, some of the objects and parts fixed by the bolts are damaged, and it is necessary to remove the bolts and repair the fixed objects and parts. By using the disassembly device to remove the self-locking device provided at the bottom of the bolt, the connection between the self-locking device and the bolt and nut can be released, ensuring that the connection between the bolt and the nut does not change. After the repair of the object and part fixed by the bolt is completed, a new self-locking device can be used to install it to the bottom of the bolt, ensuring that the reinstalled self-locking bolt can be fixed and self-locking.

[0016] (2) Through the present invention, the self-locking device includes a fixing frame and a retaining frame. The retaining frame is made of two kinds of materials, the inner layer is made of rubber material, and the outer layer is made of metal material. A limiting structure is arranged on the outer side of the fixing frame. The limiting structure includes arranged bevel teeth. The rubber can cooperate with the bevel teeth. The bevel teeth can move unidirectionally on the rubber. Since the thickness of the objects and parts clamped between the bolt and the nut is inconsistent, the distance between the nut and the fixing frame is not fixed. Therefore, the limiting distance of the retaining frame is not fixed. Rubber is used for the inner layer of the retaining frame. The distance that the bevel teeth move on the rubber can be freely adjusted, and the bevel teeth can limit the movement of the retaining frame on the fixing frame, thereby ensuring that the fixing frame can adapt to the distance between the nut and the nut.

[0017] In the case of multiple disassembly and assembly of the self-locking screw, the self-locking structure can be replaced, and the new self-locking structure can ensure that the self-locking ability of the self-locking screw is maintained in a better state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the assembly structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the fixing frame of the present invention and a schematic diagram of the cross-section of the fixing frame.

[0021] Figure 4 It is a schematic diagram of the fixing frame structure of the present invention.

[0022] Figure 5 It is a schematic diagram of the bolt structure of the present invention.

[0023] Figure 6 It is a schematic structural diagram of the retaining frame of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the dismantling device of the present invention.

[0025] In the figure: 1-bolt, 11-slot, 2-nut, 3-self-locking device, 31-fixing frame, 311-removal frame, 312-oblique teeth, 32-retaining frame, 4-removal device, 41-removal foot. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0027] Example 1

[0028] like Figure 1-Figure 7As shown, a self-locking screw includes a bolt 1 and a nut 2. In this embodiment, the bolt 1 and the nut 2 are common bolts and nuts on the market. The structure of the bolt 1 includes a bolt head and a screw rod. The outer side of the bolt 1 is provided with a thread, and the inner side of the nut 2 is provided with a thread. The bolt 1 and the nut 2 are connected by threads, and the nut 2 is provided on the screw rod. A hole through which the screw rod passes is provided on the object to be fixed. The bolt 1 can pass through the hole on the fixed object, and the nut 2 cooperates with the bolt 1 from the other end of the hole to fix the object.

[0029] A self-locking device 3 is provided at the bottom of the bolt 1, and the self-locking device includes a fixing frame 31 and a retaining frame 32. The fixing frame 31 is provided at the bottom of the bolt 1; the retaining frame 32 is provided on the outside of the fixing frame 31; a limiting structure is provided on the outside of the fixing frame 31, and the limiting structure can limit the movement of the retaining frame 32 on the fixing frame 31; one end of the retaining frame 32 contacts with the nut 2 to limit the movement of the nut 2 and ensure that the connection between the nut 2 and the bolt 1 is not loose.

[0030] Reference Figure 3 , Figure 4 , Figure 5 The structure of the fixing frame 31 is a hollow cylinder, and a buckle extending toward the bottom is provided at the center of the top circle of the fixing frame 31; the outer layer of the fixing frame 31 extends toward the bottom and covers the outer surface of the bolt 1, and the length of the outer layer of the fixing frame 31 is longer than the length of the buckle of the fixing frame 31; the middle layer of the fixing frame 31 is a hollow structure, which can accommodate the bottom of the bolt 1. The outer layer of the fixing frame 31 is not a whole, and a plurality of gaps are provided on the outer layer of the fixing frame 31 to assist the installation of the bolt 1. The fixing frame 31 is connected to the bottom of the bolt 1 through the buckle. The bottom of the bolt 1 is provided with a slot 11 for accommodating the buckle at the top of the fixing frame 31, and the fixing frame 31 is fixed to the slot 11 at the bottom of the bolt 1 through the buckle, and the outer layer of the fixing frame 31 covers the surface at the bottom of the bolt 1.

[0031] The number of buckles of the fixing frame 31 includes at least two. In this embodiment, the number of buckles inside the fixing frame 31 is 3. The fixing frame 31 is made of ABS plastic.

[0032] A limiting structure is disposed on the outer side of the fixing frame 31. In this embodiment, the limiting structure includes oblique teeth 312 arranged in an arranged manner. Figure 3 , Figure 4 The bevel gear 312 is a right triangle, one end of the right angle is close to one end of the fixing frame 31 , and the bevel faces the top of the fixing frame 31 .

[0033] Reference Figure 6The retainer 32 is a hollow cylinder, and the diameter of the hollow part is slightly smaller than the maximum diameter of the fixed frame 31. The retainer 32 is divided into an inner layer and an outer layer. The inner layer of the retainer 32 is made of rubber material, and the outer layer of the retainer 32 is made of metal material. The outer layer of the retainer 32 ensures the overall structure of the retainer 32, and the inner layer of the retainer 32 can be fixed to the outer side of the fixed frame 31 in an interference fit manner, ensuring that the retainer 32 can only be nested from the top of the fixed frame 31 to the bottom of the fixed frame 31. The helical teeth set on the outer layer of the fixed frame 31 can make the diameter of the smaller end of the fixed frame 31 smaller than the diameter of the inner circle of the retainer 32, and make the diameter of the larger end of the fixed frame 31 larger than the diameter of the inner circle of the retainer 32, so that the retainer 32 is only nested from one end of the fixed frame 31; during the movement of the retainer 32, the helical teeth 312 can limit the moving direction of the retainer 32 to prevent the retainer 32 from retreating.

[0034] After the self-locking device 3 is fixed to the bottom of the bolt 1, when the fixed component fails due to long-term use or its own structure, it is necessary to release the fixing between the screws and maintain the fixed component. Therefore, the removal device 4 is required.

[0035] Reference Figure 7 The dismantling device 4 is provided with dismantling feet 41 at the bottom, and the number of the dismantling feet 41 is the same as the number of buckles of the fixing frame 31.

[0036] Reference Figure 4 A dismantling frame 311 is provided on the back of the buckle of the fixing frame 31 , and the dismantling frame 311 can cooperate with the dismantling foot 41 to release the connection between the fixing frame 31 and the bolt 1 .

[0037] The structure of the dismantling device 4 is a cylinder, and dismantling feet 41 are arranged at the bottom of the cylinder, the number of which is the same as the number of the buckles on the fixing frame 31. A dismantling frame 311 is arranged on the back of the buckle of the fixing frame 31 near the center of the fixing frame 31. The dismantling frame 311 is a hollow platform, one end of which fits the buckle of the fixing frame 31 in an arc shape, and the other end is a straight line. The structure of the dismantling foot 41 is the structure of the hollow part of the dismantling frame 311, and the dismantling foot 41 can be extended into the dismantling frame 311. By controlling the dismantling foot 41, the position of the dismantling frame 311 is moved, and the buckle position of the fixing frame 31 is adjusted. After the buckle of the fixing frame 31 is disengaged from the slot 11 of the bolt 1, the fixing frame 31 can be pushed to move backward, thereby releasing the connection between the fixing frame 31 and the bolt 1.

[0038] One end of the dismantling foot 41 close to the cylinder has a certain toughness, and the fixing frame 31 can be controlled by pushing the dismantling foot 41 inwardly. After the connection between the dismantling device 4 and the fixing frame 31 is released, the dismantling foot 41 can return to its original state.

[0039] In this embodiment, without changing the overall structure and connection method of the bolt and nut, a slot 11 is provided at the bottom of the bolt and a self-locking device 3 is provided. During use, the screw limits the displacement of the nut 2 due to vibration or external force during use through the retaining frame 32, so that the screw can be prevented from loosening during use and the tightening effect is reduced.

[0040] The fixing frame 31 is connected to the bolt 1 by means of a buckle, and a disassembly frame 311 is provided on the back of the buckle, and also includes a disassembly device 4 used in conjunction with the disassembly frame 311. The disassembly device 4 can be connected to the buckle on the back of the fixing frame 311 to release the connection between the fixing frame 311 and the bolt 1, replace the new fixing frame 31, or remove the bolt 1 as a whole.

[0041] After long-term use or when the fastened parts fail, it is necessary to remove the bolt 1 and repair the fixed parts. By using the disassembly device 4 to remove the self-locking device 3 set at the bottom of the bolt 1, the connection between the self-locking device 3 and the bolt 1 and the nut 2 can be released to ensure that the connection between the bolt 1 and the nut 2 does not change. After the repair of the parts fixed by the bolt 1 is completed, a new self-locking device 3 can be installed at the bottom of the bolt 1 to ensure that the reinstalled self-locking bolt can be fixed and self-locking.

[0042] The self-locking device 3 includes a fixing frame 31 and a retaining frame 32. The retaining frame 32 is made of two materials, the inner layer is made of rubber material, and the outer layer is made of metal material. A limiting structure is arranged on the outer side of the fixing frame 31. The limiting structure includes arranged bevel teeth 312. The rubber can cooperate with the bevel teeth 312, and the bevel teeth can move unidirectionally on the rubber. Since the thickness of the objects and parts clamped between the bolt 1 and the nut 2 is inconsistent, the distance between the nut 2 and the fixing frame 31 is not fixed, and therefore the limiting distance of the retaining frame 32 is not fixed. Rubber is used for the inner layer of the retaining frame 32, and the moving distance of the bevel teeth 312 on the rubber can be freely adjusted, and the bevel teeth 312 can limit the movement of the retaining frame 32 on the fixing frame 31, thereby ensuring that the fixing frame 31 can adapt to the distance between the nut 2.

[0043] In the case of multiple disassembly and assembly of the self-locking screw, the self-locking structure 3 can be replaced, and the new self-locking structure can ensure that the self-locking ability of the self-locking screw is maintained in a better state.

[0044] The overall installation steps of self-locking screws are:

[0045] 1. Set a hole reserved for bolt 1 on the object to be fastened;

[0046] 2. Bolt 1 passes through the reserved hole on the fastened object;

[0047] 3. Fix the nut 2 on the bolt 1, and the bolt 1 and the nut 2 are connected by threads;

[0048] 4. Fix the fixing frame 31 to the bottom of the bolt 1 by means of a buckle, and the outer layer of the fixing frame 31 covers the bottom surface of the bolt 1;

[0049] 5. Push the retaining frame 32 from the top of the fixing frame 31 to the bottom of the fixing frame 31 and stop when the retaining frame 32 contacts one side of the nut 2.

[0050] In this embodiment, the bolt 1 passes through the fixed object and is fixed using the nut 2. A distance is reserved between the end of the nut 2 away from the fixed object and the bottom of the bolt 1 for setting the self-locking device 3. This distance is longer than the distance of the fixing frame 31 set on the outside of the bolt 1, and shorter than the sum of the distance of the fixing frame 31 set on the outside of the bolt 1 and the length of the retaining frame 32 itself.

[0051] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-locking screw, comprising Bolts, nuts, The outer side of the bolt and the inner side of the nut are provided with threads, and the bolt and the nut are connected through the threads. Features: A self-locking device is provided at the bottom of the bolt, and the self-locking device includes a fixing frame and a retaining frame; the fixing frame is provided at the bottom of the bolt, and the retaining frame is provided outside the fixing frame; A limiting structure is arranged outside the fixing frame, and the limiting structure can limit the moving direction of the retaining frame on the fixing frame. The retaining frame can limit the movement of the nut, ensuring that the connection between the nut and the bolt is not loose.

2. A self-locking screw according to claim 1, characterized in that: A buckle is arranged at the bottom of the fixing frame, a slot for accommodating the buckle is arranged at the bottom of the bolt, and the fixing frame is fixed to the bottom of the bolt through the buckle.

3. A self-locking screw according to claim 2, characterized in that: The number of the buckles is at least 2.

4. A self-locking screw according to claim 1, characterized in that: The limiting structure includes arranged oblique teeth, and the inclined surfaces of the oblique teeth face the top of the fixing frame.

5. A self-locking screw according to claim 4, characterized in that: The retaining frame can enter the limiting structure in one direction and maintain the position of the retaining frame in the limiting structure.

6. A self-locking screw according to any one of claims 1 to 5, characterized in that: Also includes removal device.

7. A self-locking screw according to claim 6, characterized in that: The bottom of the dismantling device is provided with dismantling feet, and the number of the dismantling feet is the same as the number of the buckles.

8. A self-locking screw according to claim 7, characterized in that: A dismantling frame is arranged at the back of the buckle, and the dismantling frame can cooperate with the dismantling foot to release the connection between the fixing frame and the bolt.

Images