Self-locking nut

Abstract

The utility model discloses a self-locking nut, which relates to the technical field of locking pieces, and comprises a nut main body, an outer sleeve and a self-locking structure, the nut main body comprises a first nut sub-body and a second nut sub-body, the first nut sub-body and the second nut sub-body can be spliced to form the nut main body, the first nut sub-body is provided with a first part thread groove, and the second nut sub-body is provided with a second part thread groove. The first nut split body is provided with a first part thread groove, the second nut split body is provided with a second part thread groove, the first part thread groove and the second part thread groove form a thread hole of the nut main body when the first nut split body and the second nut split body are spliced, and the outer sleeve can be detachably and fixedly arranged outside the first nut split body and the second nut split body in a sleeving mode; the self-locking structure is arranged on the nut body and can allow a screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body. The self-locking nut is convenient to mount and dismount, and the service life of the self-locking nut can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of locking pieces, in particular to a self-locking nut. Background Art

[0002] Mechanical equipment often needs to be disassembled and assembled. Self-locking nuts are used in all fields. Compared with ordinary nuts, they are more widely used and have higher safety and vibration resistance and loosening resistance. In traditional self-locking nuts, in high temperature environments, the nylon melts, causing the nut to fail to self-lock. In extremely high temperatures, thermal expansion can cause thread deformation or diffusion welding, which can lock the nut and the screw and make it difficult to remove. In extremely cold environments, water vapor easily condenses into ice, causing the nut to get stuck, making it difficult or laborious to remove. Traditional self-locking nuts can only be installed by gradually rotating them into place from the bottom of the screw, which not only leads to a slower installation speed, but also causes more friction and wear between the nut and the screw, thereby reducing the life of the nut and the screw. Utility Model Content

[0003] The purpose of the utility model is to provide a self-locking nut to solve the problems existing in the above-mentioned prior art, to facilitate installation and disassembly, and to effectively prolong the service life.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a self-locking nut, including a nut body, an outer sleeve and a self-locking structure, the nut body includes a first nut split and a second nut split, the first nut split and the second nut split can be assembled to form the nut body, the first nut split has a first part of the thread groove, the second nut split has a second part of the thread groove, the first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut split and the second nut split are assembled, the outer sleeve can be detachably fixedly sleeved on the outside of the first nut split and the second nut split; the self-locking structure is arranged on the nut body, and the self-locking structure can allow a screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

[0006] Preferably, the self-locking structure includes a retaining body, a spiral mounting groove is provided on the inner surface of the threaded hole, and the spiral direction of the spiral mounting groove is the same as the thread direction of the threaded hole; the retaining body is used to be fixed in the spiral mounting groove, and a plurality of locking bodies are fixedly arranged on the retaining body, each of the locking bodies is inclined in the same direction as the screw is screwed into the nut body, and an end of each locking body close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

[0007] Preferably, the retaining body is elastic, each of the locking bodies is elastic, one end of each locking body away from the screw contacts the inner wall of the spiral mounting groove, and the distance between one end of each locking body away from the screw and one end of each locking body close to the screw is greater than the depth of the spiral mounting groove, so that the end of each locking body close to the screw can extend out of the spiral mounting groove.

[0008] Preferably, the first nut split body includes a third nut split body and a fourth nut split body, the third nut split body and the fourth nut split body can be assembled to form the first nut split body, the third nut split body is placed between the second nut split body and the fourth nut split body, the end of the third nut split body close to the second nut split body is a self-locking end, and the self-locking structure includes a plurality of piercing pieces, each of the piercing pieces is fixedly arranged on the top of the thread tooth of the self-locking end, and each of the piercing pieces can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

[0009] Preferably, a plurality of first splicing protrusions and a plurality of first splicing grooves are alternately arranged on the splicing surface of the first nut split body, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut split body. When the first nut split body and the second nut split body are spliced ​​together, each of the first splicing protrusions is embedded in each of the second splicing grooves, and each of the second splicing protrusions is embedded in each of the first splicing grooves.

[0010] Preferably, the self-locking structure includes a block, and a block installation groove is opened at the joint of the inner wall of the nut body. The block is arranged in the block installation groove, and the end of the block close to the screw can be pressed into the block installation groove by the screw when the screw is screwed into the nut body, and the end of the block close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

[0011] Preferably, the self-locking structure comprises a nylon ring, and the nylon ring is fixedly sleeved between the nut body and the screw.

[0012] Preferably, it also includes a first triangular clamp and a second triangular clamp, a first mounting hole and a second mounting hole are provided on the side surface of the outer sleeve, the first mounting hole and the second mounting hole are symmetrical about the center line of the outer sleeve, two first clamping grooves are provided on the outer side surface of the first nut split body, and two second clamping grooves are provided on the outer side surface of the second nut split body; the first triangular clamp is used to be placed in the first mounting hole, when the first triangular clamp is placed in the first mounting hole, one end of the first triangular clamp is embedded in one of the first clamping grooves, and the other end of the first triangular clamp is embedded in another of the first clamping grooves; the second triangular clamp is used to be placed in the second mounting hole, when the second triangular clamp is placed in the second mounting hole, one end of the second triangular clamp is embedded in one of the second clamping grooves, and the other end of the second triangular clamp is embedded in another of the second clamping grooves.

[0013] Preferably, it also includes a first set screw and a second set screw, the first set screw and the second set screw are symmetrically arranged about the center line of the outer sleeve, the first set screw can lock and fix the outer sleeve and the first nut separately, and the second set screw can lock and fix the outer sleeve and the second nut separately.

[0014] Preferably, the outer sleeve is formed by an extended sheet wound around the outer surface of the nut body.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The self-locking nut provided by the utility model comprises a nut body comprising a first nut body and a second nut body. The first nut body and the second nut body can be assembled together to form the nut body. The outer sleeve can be detachably fixedly sleeved on the outside of the first nut body and the second nut body to maintain the assembled state of the first nut body and the second nut body, which is convenient for installation and disassembly and can effectively extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of the initial nut diagonal splitting in the self-locking nut in Example 1;

[0019] Figure 2 This is a schematic diagram of the initial nut in the self-locking nut in the first embodiment being split obliquely in the middle;

[0020] Figure 3 This is a schematic diagram of the initial nut in the self-locking nut in the first embodiment being split in the middle;

[0021] Figure 4 This is a schematic diagram of a self-locking nut in Embodiment 6;

[0022] Figure 5 for Figure 4 Schematic diagram of the first set screw connection;

[0023] Figure 6 This is a schematic diagram of the self-locking nut in Embodiment 5;

[0024] Figure 7 for Figure 6 Schematic diagram of the first triangular clamp in;

[0025] Figure 8 It is a schematic diagram of the first nut split in the self-locking nut in the first embodiment;

[0026] Fig. 9 It is a schematic diagram of the split second nut in the self-locking nut in the first embodiment;

[0027] Fig.10 for Figure 6 Schematic diagram of outer sleeve in;

[0028] Fig.11 It is a schematic diagram of the holding body in the first embodiment;

[0029] Fig.12 This is a schematic diagram of the self-locking nut assembly in the first embodiment;

[0030] Fig.13 This is a schematic diagram of the self-locking nut in the first embodiment;

[0031] Fig.14 This is a schematic diagram of a self-locking nut in Embodiment 2;

[0032] Fig.15 for Fig.14 Schematic diagram of the third nut split;

[0033] Fig.16 for Fig.15 Schematic diagram of the insertion piece in;

[0034] Fig.17 This is a schematic diagram of another self-locking nut in Embodiment 2;

[0035] Fig.18 This is a schematic diagram of a card block in a first preferred implementation manner of Example 3;

[0036] Fig.19This is a schematic diagram of a V-shaped spring in a first preferred implementation manner of Example 3;

[0037] Fig. 20 This is a schematic diagram of the self-locking nut assembly in a first preferred implementation manner of Example 3;

[0038] Fig.21 This is a schematic diagram of a card block installation slot in a first preferred implementation manner of Example 3;

[0039] Fig. 22 for Fig. 20 Schematic diagram of the misalignment of the self-locking nut;

[0040] Fig.23 This is a schematic diagram of a card block installation slot in a second preferred implementation manner of Example 3;

[0041] Fig.24 for Fig.23 Enlarged view of the card block installation slot;

[0042] Fig.25 This is a schematic diagram of the assembly of a self-locking nut in a third preferred implementation manner of Example 3;

[0043] Fig.26 This is a schematic diagram of a card block in a third preferred implementation manner of Example 3;

[0044] Fig. 27 This is a schematic diagram of a support block in a third preferred implementation manner of Example 3;

[0045] Fig.28 This is a schematic diagram of the assembly of a self-locking nut in a fourth preferred implementation manner of Example 3;

[0046] Fig.29 This is a schematic diagram of a card block in a fourth preferred implementation manner of Example 3;

[0047] Fig.30 This is a schematic diagram of a card block installation slot in a fourth preferred implementation manner of Example 3;

[0048] Fig.31 This is a schematic diagram of the self-locking nut assembly in the fourth embodiment;

[0049] Fig.32 This is a schematic diagram of a nylon ring in Example 4;

[0050] In the figure: 1-first nut split, 2-second nut split, 3-outer sleeve, 4-spiral mounting groove, 5-retaining body, 6-locking body, 7-third nut split, 8-fourth nut split, 9-first splicing protrusion, 10-first splicing groove, 12-first set screw, 13-piercing sheet, 14-block, 15-V-shaped spring, 16-support block, 17-nylon ring, 18-first triangular clamp, 19-first mounting hole, 20-block mounting groove. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] The purpose of the utility model is to provide a self-locking nut to solve the problems existing in the above-mentioned prior art, to facilitate installation and disassembly, and to effectively prolong the service life.

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0054] Embodiment 1

[0055] like Figure 1 , Figure 2 , Figure 3 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, the present embodiment provides a self-locking nut, including a nut body, an outer sleeve 3 and a self-locking structure, the nut body includes a first nut body 1 and a second nut body 2, the first nut body 1 and the second nut body 2 can be assembled to form the nut body, the first nut body 1 has a first part of the thread groove, the second nut body 2 has a second part of the thread groove, the first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut body 1 and the second nut body 2 are assembled, the outer sleeve 3 can be detachably fixedly sleeved on the outside of the first nut body 1 and the second nut body 2; the self-locking structure is arranged on the nut body, and the self-locking structure can allow the screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

[0056] The self-locking nut provided in the present embodiment comprises a nut body including a first nut body 1 and a second nut body 2. The first nut body 1 and the second nut body 2 can be assembled together to form a nut body. An outer sleeve 3 can be detachably fixedly sleeved on the outside of the first nut body 1 and the second nut body 2 to maintain the assembled state of the first nut body 1 and the second nut body 2, which is convenient for installation and disassembly and can effectively extend the service life. Specifically, when the self-locking nut provided in the present embodiment is disassembled, the outer sleeve 3 is removed first. After the outer sleeve 3 is removed, the nut body will split from the assembled portion to separate the first nut body 1 and the second nut body 2. The two nut parts 2 can realize the quick disassembly of the nut, which can greatly reduce the time of removing the nut, improve work efficiency, and be efficient and convenient; when installing the self-locking nut provided in this embodiment, the first nut part 1 and the second nut part 2 can be directly assembled on both sides of the screw to form the nut body, without gradually rotating it into place from the bottom of the screw, which effectively improves the installation speed, has high durability and wear resistance, reduces invalid friction when positively pressing or reversely screwing out the thread, and only installs or removes at the position to be pressed, reduces the friction and wear between the nut and the screw, and can effectively extend the service life. , can maintain a tightened state for a long time; the self-locking nut provided in this embodiment has a self-locking function, which can avoid loosening under long-term vibration and impact, thereby effectively preventing the safety hazards caused by the loosening of the fastener, significantly improving the anti-loosening performance and shockproof function of the nut, and by changing the structure of the nut, the quick release, quick installation and self-locking are integrated into one, so that the multifunctionality of the nut is realized, and the production cost of the unit product and the time cost of removing the nut are significantly reduced. Since the self-locking nut provided in this embodiment has a self-locking function, the maintenance cost can be reduced. Traditional nuts need to be checked and tightened regularly to ensure that they are not loose or fall off. However, after adopting the self-locking nut provided in this embodiment, engineers can reduce the working time of daily inspections, thereby reducing maintenance costs and saving time. The self-locking nut provided in this embodiment has a self-locking function, and its strength is high, and it can withstand large tension and pressure, and is suitable for high-load application scenarios. The self-locking method of the self-locking nut provided in this embodiment will damage the screw, but the nut body is intact and can be reinstalled after disassembly, which reduces the maintenance cost. The self-locking nut provided in this embodiment has a quick release function, and its installation is simple and easy to operate, and no special tools and skills are required. The self-locking nut provided in this embodiment can be used in all fields. Compared with traditional nuts, it is more widely used and has higher safety and anti-seismic and anti-loosening properties.For example, in the fields of aviation and aerospace, the self-locking nuts provided in this embodiment can be used in the manufacture and maintenance of high-precision and high-reliability equipment such as aircraft and rockets to ensure the stability and safety of the equipment; in the automotive field, in automobile maintenance, the self-locking nuts provided in this embodiment can be used for operations such as tire replacement, transmission disassembly and maintenance, and even in various competitions, maintenance station personnel can replace spare parts more quickly; in the field of industrial equipment maintenance, the self-locking nuts provided in this embodiment can be used for loading, unloading and replacement of various fasteners; in the field of building structures, the self-locking nuts provided in this embodiment can be applied to fasteners such as various steel structures, pipelines, bridges and flood control projects. In future architectural designs, the self-locking nuts provided in this embodiment can be used for fastening in modular house buildings; in the medical and other fields, the self-locking nut products made of specific materials provided in this embodiment can be used for fixation of human fractures, and because of the quick-release function, the pain of patients during the removal process and the time for medical staff to remove the nuts can be reduced. ; In the chemical industry, the self-locking nut provided in this embodiment can be used to fasten various equipment and pipelines in chemical reaction devices to ensure sealing and stability; in the military field, since the self-locking nut provided in this embodiment has a self-locking function, it can be widely used in the assembly and maintenance of various military equipment, and can be more used in heavy equipment such as aircraft, rockets, tanks, armored vehicles and military vehicles that are subject to large impacts and vibrations; it is more convenient to use in some special environments. For example, in a cold environment, water vapor easily condenses into ice, causing the nut to get stuck. In a high temperature environment, thermal expansion can cause thread deformation or diffusion welding, thereby locking the screw and nut. In a highly corrosive environment, it is necessary to minimize the contact time between the human body and the nut. In the face of these situations, the quick-release function of the self-locking nut provided in this embodiment is needed, which is easier to remove, convenient, fast and efficient; in addition, the self-locking nut provided in this embodiment can be used in daily life, such as the maintenance of car tires, bicycles or automatic vehicle wheels, the maintenance of electrical appliances, the disassembly and assembly of furniture, and the maintenance of plumbing facilities. In short, the self-locking nut provided in this embodiment can be applied to disposable or reusable articles in medical, chemical, thermal engineering, automobile, railway, aviation, aerospace, shipbuilding, electronic equipment, molds, military, cold environment and daily life, etc. It has strong applicability and wide application. The self-locking nut provided in this embodiment is a nut that can be self-locking and quickly disassembled and installed, and can be widely used in all fields. In summary, the self-locking nut provided in this embodiment has the advantages of quick disassembly, quick disassembly and quick installation, self-locking integration, wide range of applications, high durability, reduced maintenance costs, multiple options, reusable, easy to install, stronger self-locking effect at high temperature and easy to disassemble, etc., and is a very excellent fastener.In addition, the self-locking nut provided in this embodiment has a simple structure, a mature manufacturing process, requires less material and is easy to produce automatically. It can be but is not limited to manufacturing large sizes such as M3, M4, M5, M6 and even M100, M300, and has a wide range of sizes that can be manufactured.

[0057] In this embodiment, the first nut split 1 and the second nut split 2 can be made as follows: first, the initial nut is made, and then the initial nut is cut into two halves by wire cutting, one half is the first nut split 1, and the other half is the second nut split 2. In order to increase the strength, plasticity, toughness and manufacturing cost of the first nut split 1 and the second nut split 2 as much as possible, while ensuring the sharpness of the thread crest, it is preferred to use stainless steel as the raw material, and then perform quenching and high-temperature tempering treatment on the thread crest. The initial nut is divided into three splitting methods, namely diagonal splitting, middle straight splitting and middle oblique splitting. It should be noted here that the material used to make the initial nut can be the same as the nut material on the market.

[0058] Diagonal splitting: Figure 1 As shown, the initial nut is split at the diagonal part. The advantage of the diagonal split is that the thickness at the diagonal part is larger, so that the strength, bearing capacity, torque and stability of the first nut part 1 and the second nut part 2 can be maintained;

[0059] Middle oblique split: Figure 2 As shown, it refers to splitting at a certain angle at the thinnest part of the initial nut. The middle oblique splitting can effectively change the top of the initial nut from a right-angle thread to an acute-angle thread, which increases the sharpness of the thread in disguise. After such processing, the change in the angle of the thread can make the thread opening of the nut better penetrate into the screw, increasing the self-locking effect of the nut.

[0060] Splitting in the middle: Figure 3 As shown, vertical splitting is performed at the thinnest part of the initial nut. The advantage of splitting in the middle is that the processed thread in the middle is straight, not inclined, which makes it easier to quench and high-temperature temper the thread.

[0061] like Figure 11-13As shown, the self-locking structure includes a retaining body 5, and a spiral mounting groove 4 is provided on the inner surface of the threaded hole, and the spiral direction of the spiral mounting groove 4 is the same as the thread direction of the threaded hole; the retaining body 5 is used to be fixed in the spiral mounting groove 4, and a plurality of locking bodies 6 are fixedly arranged on the retaining body 5, and each locking body 6 is inclined in the same direction as the screw is screwed into the nut body, and the end of each locking body 6 close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body. Even if the retaining body 5 of the self-locking nut provided by the present invention melts at high temperature, the locking body 6 can continue to self-lock the nut and the screw, and the self-locking effect is long-lasting. Under extremely high temperatures, thermal expansion of traditional nuts will cause deformation of the threads or diffusion welding, thereby locking the screw and the nut and making them difficult to remove. The self-locking nut provided by the present invention can be quickly removed through the quick release function; in extremely cold environments, water vapor condenses into ice and expands in volume within the threads, causing the fitting gap between the threads to become smaller, causing the nut to get stuck, and even when this physical phenomenon is repeated many times, the gap between the threads may deform and expand. At this time, traditional nuts become difficult to remove or difficult to remove due to their non-quick-release characteristics, while the self-locking nut provided by the present invention has a quick release function and can be easily removed; the retaining body 5 of the self-locking nut provided by the present invention is installed in the spiral mounting groove 4 inside the nut body, and even in a high-load environment such as exposure to sunlight, corrosiveness, acidity, and humidity, the retaining body 5 will be effectively protected by the nut body, will not easily fail, and the self-locking effect will not be weakened.

[0062] In the first preferred implementation of this embodiment, the retaining body 5 is installed in the middle of the nut body, which can be installed on both sides. It can be arranged to screw in the screw on one side of the nut body, or it can be arranged to screw in the screw on the other side of the nut body.

[0063] In the second more preferred implementation manner of this embodiment, the retaining body 5 is elastic, each locking body 6 is elastic, one end of each locking body 6 away from the screw contacts the inner wall of the spiral mounting groove 4, and the distance between the end of each locking body 6 away from the screw and the end of each locking body 6 close to the screw is greater than the depth of the spiral mounting groove 4, so that the end of each locking body 6 close to the screw can extend out of the spiral mounting groove 4. The structure is simple, and each locking body 6 is convenient for locking the screw. The locking body 6 is placed at an angle. When the screw is screwed into the nut body, due to the inclination of the locking body 6 and the elasticity of the retaining body 5, the locking body 6 is pressed and tilted a little, and the inclination angle is changed from the original inclination angle to a degree less than the original inclination angle, so that the screw can be screwed in normally. The retaining body 5 is composed of a plurality of small blades, the shape of the small blades is a straight line, and the small blades have a certain elasticity. The two ends of the small blades are connected to the locking body 6. When the screw is screwed into the nut body, the locking body 6 is bent by the screw, and the small blades are also bent by the locking body 6 due to their elasticity. The small blades play a role in straightening the locking body 6 and rebounding the locking body 6. When the screw is screwed out of the nut body, due to the inclination of the locking body 6 and the length of the locking body 6 is greater than the depth of the spiral mounting groove 4, and the locking body 6 is locked. The front end of the stop body 6 is sharp, and the front end of the locking body 6 will "bite" the screw thread, and the length of the locking body 6 is greater than the distance between the screw thread and the bottom wall of the spiral mounting groove 4, and the two ends of the small blade are connected to the locking body 6 to straighten the locking body 6, so self-locking is achieved; the material of the locking body 6 and the retaining body 5 is preferably but not limited to common materials on the market such as stainless steel, high-temperature alloy, carbon steel, ceramic, carbon-based composite material, glass, copper, aluminum, magnesium, titanium or carbon fiber, and the self-locking effect of this scheme is stronger at high temperatures, because when self-locking, the locking body 6 cuts into the screw, and the high temperature will make the locking body 6 and the screw melt together, so that they become one, so the self-locking effect is strong, and the quick release function is also retained, which is easier to remove at high temperatures.

[0064] Furthermore, the cross section of the outer sleeve 3 is a hexagonal ring, which can be consistent with the profile of the nut body and save materials.

[0065] Furthermore, a plurality of first splicing protrusions 9 and a plurality of first splicing grooves 10 are alternately arranged on the splicing surface of the first nut split body 1, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut split body 2. When the first nut split body 1 and the second nut split body 2 are spliced ​​together, each first splicing protrusion 9 is embedded in each second splicing groove, and each second splicing protrusion is embedded in each first splicing groove 10.

[0066] Furthermore, the cross-sections of the first splicing protrusion 9 and the second splicing protrusion are both rectangular, with a larger contact area, which can more effectively prevent the axial movement of the nut body and allow the nut body to be radially staggered, thus preparing the conditions for self-locking and separating the nut body from the splicing point for quick removal; as an optional implementation method of this embodiment, the cross-sections of the first splicing protrusion 9 and the second splicing protrusion can also be trapezoidal, triangular, serrated or circular arc, etc.

[0067] Embodiment 2

[0068] like Figure 14-17 As shown, different from the first embodiment, in this embodiment, the first nut body 1 includes a third nut body 7 and a fourth nut body 8, the third nut body 7 and the fourth nut body 8 can be assembled to form the first nut body 1, the third nut body 7 is placed between the second nut body 2 and the fourth nut body 8, the end of the third nut body 7 close to the second nut body 2 is a self-locking end, and the self-locking structure includes a plurality of piercing pieces 13, each piercing piece 13 is fixedly arranged on the top of the thread of the self-locking end, and each piercing piece 13 can cut into the external thread of the screw when the screw has a tendency to screw out of the nut body. That is, the nut body is cut into three parts: the third nut body 7, the fourth nut body 8 and the second nut body 2, wherein the cross section of the third nut body 7 can be either a quadrilateral or a triangle.

[0069] like Figure 14-16 As shown, the first preferred implementation of this embodiment, when the cross-section of the third nut split 7 is a quadrilateral, the outer side surface of the third nut split 7 is smooth, the inner side surface is threaded, and the remaining two side surfaces are respectively used to assemble with the second nut split 2 and the fourth nut split 8. Such a structure can ensure that the nut body is easy to disassemble quickly and can ensure the self-locking of the nut body. The piercing sheet 13 is preferably but not limited to a steel sheet, and the steel sheet is spot welded to the top of the threaded tooth of the self-locking end on the third nut split 7. Such special treatment can ensure the realization of the self-locking function of the nut body. Working principle The self-locking nut is installed first, and then when the screw is screwed in, the side of the piercing piece 13 that fits the screw thread is in the shape of an arc, the meshing degree is high, and the piercing piece 13 is small in size, so the screw can be easily screwed in. When the screw is to be screwed out, the piercing piece 13 will cut into the screw thread, and when the piercing piece 13 cuts into the screw thread, the third nut body 7 is subjected to force to apply an extrusion force to the outer sleeve 3, so that the outer sleeve 3 will tilt in the direction of the extrusion force, thereby driving the second nut body 2 to tighten the screw, so that the self-locking function will form a cycle, and self-locking is achieved.

[0070] like Fig.17As shown, the second more preferred implementation manner of this embodiment, when the cross-section of the third nut split 7 is a triangle, its working principle is basically the same as when the cross-section of the third nut split 7 is a quadrilateral. The difference is that when the cross-section of the third nut split 7 is a triangle, when the screw is screwed into the nut body, the screw thread gives the third nut split 7 a tangential force, making the third nut split 7 more unstable and squeezing the second nut split 2, so that the second nut split 2 and the third nut split 7 slip, so that the second nut split 2 will penetrate into the screw, making the self-locking ability of the nut body easy to achieve.

[0071] Embodiment 3

[0072] like Figure 18-Figure 30 As shown, different from the first embodiment, in this embodiment, the self-locking structure includes a block 14, and a block installation groove 20 is opened at the joint of the inner wall of the nut body. The block 14 is arranged in the block installation groove 20, and the end of the block 14 close to the screw can be pressed into the block installation groove 20 by the screw when the screw is screwed into the nut body, and the end of the block 14 close to the screw can cut into the external thread of the screw when the screw has a tendency to screw out of the nut body.

[0073] like Figure 18-Figure 22As shown, the first preferred implementation manner of this embodiment, the self-locking structure includes a block 14 and a V-shaped spring 15, and its structure is that a block installation groove 20 is dug inside the first nut split body 1 and the second nut split body 2, and the groove is dug at a place close to the joint seam of the inner wall of the nut body, and then the block 14 and the V-shaped spring 15 are assembled together and installed in the block installation groove 20. The working principle is that when the screw is screwed into the nut body, when it is screwed onto the block 14, since the screw is spirally screwed into the nut, the thread of the screw and the block 14 are first in point contact, and then slowly become line contact. The advantage of this is that the screw will not crush the block 14, and the screw can be smoothly screwed into the nut body. When the screw is to be unscrewed from the nut body, since the thread of the screw has been pressing the block 14, and the block 14 has been pressing the V-shaped spring 15, due to the reaction force on the V-shaped spring 15, the V-shaped The spring 15 applies a force to the block 14, causing the block 14 to bounce toward the screw direction, so that the end of the block 14 close to the screw will cut into the thread of the screw. At the same time, when the screw is unscrewed from the nut body, the screw applies a force to the block 14, and the block 14 applies a force to the nut. Moreover, due to the special position of the slot on the nut body, the first nut body 1 and the second nut body 2 are subjected to force and will be misaligned from the joint, and the first nut body 1 and the second nut body 2 will slip, and the first nut body 1 and the second nut body 2 will be staggered into the screw. In this way, under the dual action of the block 14 and the nut body, the self-locking ability is greatly improved, and the self-locking function is realized. The advantage of this structure is that it is more convenient to install the block 14 and the V-shaped spring 15, and the self-locking ability is stronger under the dual action of the block 14 and the nut body, and it is also easier to process the block 14 and the V-shaped spring 15.

[0074] like Figure 23-Figure 24 As shown, the second more preferred implementation of this embodiment is different from the first more preferred implementation of this embodiment in the position of the groove on the nut body. In the first more preferred implementation of this embodiment, there is a certain distance between the position of the groove of the block mounting groove 20 and the splicing seam, and in the second more preferred implementation of this embodiment, the position of the groove of the block mounting groove 20 is at the splicing seam. The working principle is the same as the working principle of the first more preferred implementation of this embodiment. In the second more preferred implementation of this embodiment, the reason for choosing to groove on the splicing seam is that it is easier to process the block mounting groove 20 and can be installed faster, which saves more economic cost and time cost when processing the nut.

[0075] like Figure 25-27As shown, in the third preferred implementation of the present embodiment, the position of the block installation groove 20 is the joint seam, the self-locking structure includes a block 14 and a support block 16, the block 14 has a special structure, its strength and elasticity are high, one end of the block is cut off a part, the cut part is to prevent the first nut split 1 or the second nut split 2 from sliding away from the joint seam, avoid affecting the self-locking function of the nut body, and the end face of the other end is specially treated, and the special treatment is end face quenching treatment and grinding of the sharp end face. The reason for this treatment is that the end face can cut into the screw thread when the screw is screwed out of the nut body. The support block 16 is installed in the block installation groove 20 together with the clamping block 14. The support block 16 is provided to support the clamping block 14 so that the clamping block 14 will not be crushed when the screw presses the clamping block 14. The support block 16 provides a support for the arc surface of the clamping block 14. The working principle is that when the screw is screwed into the nut body, when the screw is screwed onto the clamping block 14, since the screw is screwed into the nut body in a spiral, the thread of the screw and the clamping block 14 is first in point contact, and then slowly becomes line contact. The advantage of this is that the screw will not bend or crush the block 14. Note that the volume of the support block 16 is smaller than the block mounting groove 20, and can be completely wrapped in the block 14, so the screw thread cannot touch the support block 16, so that the screw can be smoothly screwed into the nut body. When the screw is to be screwed out of the nut body, one end of the block 14 is sharp and strong, which will cut into the screw thread. Then, the screw is screwed out, and the force on the block 14 increases. Its special structure The structure will squeeze the inner wall of the block installation groove 20, the first nut split 1 and the second nut split 2 will be misaligned from the joint due to the force, the first nut split 1 and the second nut split 2 will slip, and the first nut split 1 and the second nut split 2 will be staggered into the screw, so that under the dual action of the block 14 and the nut body, the self-locking ability is greatly improved, and the self-locking function is realized. The advantage of this embodiment is that the block installation groove 20 at the joint of the nut body is easy to process and easy to assemble, and can achieve double self-locking.

[0076] like Figure 28-Figure 30As shown, the fourth preferred implementation of this embodiment, the position of the block installation groove 20 is the joint seam, and the self-locking structure includes a block 14. The structure of the block 14 is relatively complex. One end is an arc, and the tip of the arc is quenched. The tip of the arc is sharp, and the tip of the arc protrudes out of the block installation groove 20, and the other end is a right-angle end. A part of the right-angle end is cut off. The reason for the cut is to avoid the thread of the first nut split 1 or the second nut split 2, and the right-angle end of the block 14 is embedded in the block installation groove 20. The self-locking principle is that when the screw is screwed into the nut body, since the screw is spirally screwed into the nut body, the thread of the screw is first in point contact with the block 14, and then slowly The clamping block 14 is pressed against the nut body 20, and the clamping block 14 is pressed against the nut body 20. The clamping block 14 is pressed against the nut body 20, and the nut body 2 is pressed against the nut body 20. The clamping block 14 is pressed against the nut body 20, and the nut body 2 is pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20, and the nut body 1 and the second nut body 2 are .... The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 20. The nut body 1 and the second nut body 2 are pressed against the nut body 2

[0077] Embodiment 4

[0078] like Figure 31-Figure 32 As shown, different from the first embodiment, in this embodiment, the self-locking structure includes a nylon ring 17, which is fixedly sleeved between the nut body and the screw. The nylon ring 17 is made of nylon and is a standard part. The self-locking principle is that when the screw is screwed into the nut body, the inner diameter of the nylon ring 17 is smaller than the inner diameter of the nut, which forces the nut body and the screw to squeeze the nylon ring 17, causing the nylon ring 17 to be squeezed into the thread by the screw. In this way, the screw thread, the nylon ring 17 and the thread of the nut body are squeezed together, increasing the friction between the nut body and the screw. When the screw is to be screwed out of the nut body, the nylon ring 17 has been crushed and squeezed into the thread, which makes it impossible for the screw to be screwed out of the nut body, thus forming a self-locking structure.

[0079] Embodiment 5

[0080] Different from the first embodiment, in this embodiment, Figure 6 , Figure 7 and Fig.10As shown, the self-locking nut provided by the present invention also includes a first triangular clamp 18 and a second triangular clamp. A first mounting hole 19 and a second mounting hole are provided on the side surface of the outer sleeve 3. The first mounting hole 19 and the second mounting hole are symmetrical about the center line of the outer sleeve 3. Two first clamping grooves are provided on the outer side surface of the first nut split body 1, and two second clamping grooves are provided on the outer side surface of the second nut split body 2; the first triangular clamp 18 is used to be placed in the first mounting hole 19. When the first triangular clamp 18 is placed in the first mounting hole 19, one end of the first triangular clamp 18 is embedded in one first clamping groove, and the other end of the first triangular clamp 18 is embedded in the other first clamping groove; the second triangular clamp is used to be placed in the second mounting hole, and the second When the triangular clamp is placed in the second mounting hole, one end of the second triangular clamp is embedded in a second slot, and the other end of the second triangular clamp is embedded in another second slot. The symmetrical clamping structure of the first triangular clamp 18 and the second triangular clamp is adopted to improve the mechanical strength of the overall structure and make the stress distribution of the parts more uniform, thereby reducing the problems of stress concentration and mechanical fatigue, effectively preventing the outer sleeve 3 from falling and extending the service life. The first triangular clamp 18 and the second triangular clamp are countersunk to facilitate installation by workers. Preferably, removal openings are reserved at the first mounting hole 19 and the second mounting hole on the outer sleeve 3 to facilitate the removal of the first triangular clamp 18 and the second triangular clamp using tools such as screwdrivers.

[0081] Embodiment 6

[0082] Different from the first embodiment, in this embodiment, Figure 4-Figure 5 As shown, the self-locking nut provided by the present invention also includes a first set screw 12 and a second set screw. The first set screw 12 and the second set screw are symmetrically arranged about the center line of the outer sleeve 3. The first set screw 12 can lock and fix the outer sleeve 3 and the first nut split 1, and the second set screw can lock and fix the outer sleeve 3 and the second nut split 2. The first set screw 12 and the second set screw can be, but are not limited to, set screws such as flat, cross, head with holes or hexagonal flange surfaces. The structure in which the first set screw 12 and the second set screw are symmetrically tightened improves the mechanical strength of the overall structure, makes the stress distribution of the parts more uniform, thereby reducing the problems of stress concentration and mechanical fatigue, effectively preventing the outer sleeve 3 from falling off and extending the service life.

[0083] The outer sleeve 3 is formed by an extension sheet wrapped around the outer side of the nut body. When disassembling, use a screwdriver or other sharp objects to pry up the outermost extension sheet, and untie the extension sheet from the outer side of the nut body to separate and fall off the first nut body 1 and the second nut body 2. It should be noted here that there is no specific restriction on the number of layers or turns of the extension sheet wrapped around the outer side of the nut body, and one or more layers can be used. The extension sheet is made of a material with consistent thickness and good flexibility and tensile resistance. It is preferred to use nickel, nickel-containing, chromium alloy, stainless steel sheet, carbon steel sheet or copper and other materials to cover the first nut body 1 and the second nut body 2 and fit them tightly.

[0084] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A self-locking nut, characterized in that: It includes a nut body, an outer sleeve and a self-locking structure. The nut body includes a first nut split and a second nut split. The first nut split and the second nut split can be assembled to form the nut body. The first nut split has a first part of the thread groove, and the second nut split has a second part of the thread groove. The first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut split and the second nut split are assembled. The outer sleeve can be detachably fixed on the outside of the first nut split and the second nut split. The self-locking structure is arranged on the nut body, and the self-locking structure can allow the screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

2. The self-locking nut according to claim 1, characterized in that: The self-locking structure includes a retaining body, a spiral mounting groove is provided on the inner surface of the threaded hole, and the spiral direction of the spiral mounting groove is the same as the thread direction of the threaded hole; the retaining body is used to be fixed in the spiral mounting groove, and a plurality of locking bodies are fixedly arranged on the retaining body, each of the locking bodies is inclined in the same direction as the screw is screwed into the nut body, and an end of each locking body close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

3. The self-locking nut according to claim 2, characterized in that: The retaining body is elastic, and each of the locking bodies is elastic. An end of each of the locking bodies away from the screw contacts the inner wall of the spiral mounting groove, and a distance between an end of each of the locking bodies away from the screw and an end of each of the locking bodies close to the screw is greater than the depth of the spiral mounting groove, so that an end of each of the locking bodies close to the screw can extend out of the spiral mounting groove.

4. The self-locking nut according to claim 1, characterized in that: The first nut split body includes a third nut split body and a fourth nut split body, the third nut split body and the fourth nut split body can be assembled to form the first nut split body, the third nut split body is placed between the second nut split body and the fourth nut split body, the end of the third nut split body close to the second nut split body is a self-locking end, the self-locking structure includes a plurality of piercing pieces, each of the piercing pieces is fixedly arranged on the top of the thread tooth of the self-locking end, and each of the piercing pieces can cut into the external thread of the screw when the screw has a tendency to screw out of the nut body.

5. The self-locking nut according to claim 1, characterized in that: A plurality of first splicing protrusions and a plurality of first splicing grooves are alternately arranged on the splicing surface of the first nut split body, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut split body. When the first nut split body and the second nut split body are spliced ​​together, each of the first splicing protrusions is embedded in each of the second splicing grooves, and each of the second splicing protrusions is embedded in each of the first splicing grooves.

6. The self-locking nut according to claim 5, characterized in that: The self-locking structure includes a card block, and a card block installation groove is opened at the joint of the inner wall of the nut body. The card block is arranged in the card block installation groove. The end of the card block close to the screw can be pressed into the card block installation groove by the screw when the screw is screwed into the nut body. The end of the card block close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

7. The self-locking nut according to claim 5, characterized in that: The self-locking structure comprises a nylon ring, and the nylon ring is fixedly sleeved between the nut body and the screw.

8. The self-locking nut according to claim 1, characterized in that: It also includes a first triangular clamp and a second triangular clamp, a first mounting hole and a second mounting hole are provided on the side surface of the outer sleeve, the first mounting hole and the second mounting hole are symmetrical about the center line of the outer sleeve, two first clamping grooves are provided on the outer side surface of the first nut split body, and two second clamping grooves are provided on the outer side surface of the second nut split body; the first triangular clamp is used to be placed in the first mounting hole, when the first triangular clamp is placed in the first mounting hole, one end of the first triangular clamp is embedded in one of the first clamping grooves, and the other end of the first triangular clamp is embedded in another of the first clamping grooves; the second triangular clamp is used to be placed in the second mounting hole, when the second triangular clamp is placed in the second mounting hole, one end of the second triangular clamp is embedded in one of the second clamping grooves, and the other end of the second triangular clamp is embedded in another of the second clamping grooves.

9. The self-locking nut according to claim 1, characterized in that: It also includes a first set screw and a second set screw, wherein the first set screw and the second set screw are symmetrically arranged about the center line of the outer sleeve, the first set screw can lock and fix the outer sleeve and the first nut separately, and the second set screw can lock and fix the outer sleeve and the second nut separately.

10. The self-locking nut according to claim 9, characterized in that: The outer sleeve is formed by winding an extended sheet around the outer side surface of the nut body.

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