Expansion-shrinkage type locknut

Abstract

The utility model discloses an expansion type locknut which comprises a nut body with threads, a plurality of extrusion grooves which extend downwards and penetrate through the threads are formed in the top of the nut body, extrusion strips which extend upwards are arranged at the bottoms of the extrusion grooves, and extrusion rings are arranged at the tops of the extrusion strips. A gap exists between the bottom face of the extrusion ring and the top face of the nut so that the extrusion ring can move downwards when being pressed, and when the extrusion ring is pressed to move downwards, the extrusion strips are pressed downwards so that the extrusion strips can expand towards the interior of the nut to increase friction force to the bolt. A worker only needs to normally operate the nut and the bolt, the bolt and the nut can be prevented from loosening without redundant steps, so that the use process is more convenient and faster, the rubber material of the extrusion strip can automatically expand and contract in the vibration process, and the acting force generated by vibration on the bolt and the nut is reduced.

Description

Technical Field

[0001] The utility model relates to the field of nuts, in particular to an expansion and contraction type anti-loosening nut. Background Art

[0002] Nuts and bolts are usually used to fix workpieces, especially large machinery. However, the machinery often vibrates during use, which causes the nut and bolt to vibrate synchronously. At this time, the nut and bolt will gradually shake, causing the nut and bolt to separate. Although the vibration cannot completely separate the nut and bolt, the loosened nut and bolt cannot fix the machinery, and will also cause the machinery to produce various abnormal noises during use. Therefore, it is necessary to provide a nut with an anti-loosening function. Most of the existing anti-loosening nuts play an anti-loosening role by changing the pitch of the thread so that the bolt and nut can be connected more tightly. However, the loosening of the bolt and nut is usually caused by vibration. Therefore, even if the bolt and nut are fixed more tightly, if the effect of vibration on the bolt and nut cannot be reduced, it will still cause loosening during long-term use. Utility Model Content

[0003] The utility model aims to provide an expansion and contraction anti-loosening nut to reduce the loosening of bolts and nuts caused by vibration.

[0004] In order to solve the above technical problems, the specific solution adopted by the utility model is:

[0005] An expansion and contraction anti-loosening nut comprises a nut with threaded teeth, wherein the top of the nut is provided with a plurality of extrusion grooves extending downward and penetrating the threaded teeth, the bottom of each extrusion groove is provided with an extrusion strip extending upward, the top of the extrusion strip is provided with an extrusion ring, a gap is provided between the bottom surface of the extrusion ring and the top surface of the nut to facilitate the downward movement of the extrusion ring when under pressure, and when the extrusion ring moves downward under pressure, the extrusion strip is pressed downward to expand it toward the inside of the nut to increase the friction force on the bolt.

[0006] A pressure relief groove connected to the extrusion groove is provided on the side of the nut, and a slidably connected pressure relief strip is provided in the pressure relief groove. The pressure relief strip is used to provide supporting force when the extrusion strip expands inwardly. A fixing hole penetrating the pressure relief strip is provided at the bottom of the nut, and a fixing rod for fixing the pressure relief strip is installed in the fixing hole.

[0007] The bottom of the fixing rod is provided with a protrusion for the operator to grasp conveniently, and the protrusion protrudes from the bottom surface of the nut.

[0008] The pressure relief strip is provided with a limiting block matched with the pressure relief groove, and the back surface of the limiting block is parallel to the side surface of the nut.

[0009] A connecting rope for pulling the extrusion strip out of the extrusion groove is arranged between the pressure relief strip and the extrusion strip.

[0010] The number of the connecting ropes is greater than two and the lengths of the connecting ropes gradually increase from bottom to top.

[0011] A circumferentially distributed reset pad is provided on the top of the nut, and the reset pad is located at the bottom of the extrusion ring. The reset pad is made of rubber material and is used to support the extrusion ring for rebound.

[0012] An air storage cavity is arranged inside the extruded strip, and the air storage cavity is filled with an antioxidant.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0014] 1. By applying pressure to the extrusion ring, the extrusion strip can be expanded, thereby increasing the friction force on the bolt. In this way, during use, the operator only needs to operate the nut and bolt normally, and no extra steps are required to prevent the bolt and nut from loosening, making the use process more convenient and quick. In addition, the rubber material of the extrusion strip can automatically expand and contract during vibration, thereby reducing the force exerted by vibration on the bolt and nut;

[0015] 2. The pressure relief work of the multiple extrusion strips can be completed by pulling out the fixing rod. After the extrusion strip loses the support of the pressure relief strip on the back, it will automatically rebound backwards, thereby reducing the friction on the bolt, making it easier to separate the bolt and nut.

[0016] 3. Through the gradually longer connecting rope, the extrusion strip can be pulled back more easily when the extrusion strip is aged, and the extrusion strip can be gradually separated from the thread of the bolt from bottom to top, reducing the damage to the extrusion strip caused by hard pulling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the cutaway structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the gradually increasing length of the connecting rope of the utility model;

[0020] Figure 4 It is a side view of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the pressure relief strip of the utility model;

[0022] Figure 6 This is a schematic diagram of the internal structure of the extruded strip of the utility model;

[0023] Reference numerals: nut 1; screw thread 2; extrusion ring 3; extrusion groove 4; extrusion strip 5; pressure relief groove 6; pressure relief strip 7; fixing rod 8; reset pad 9; limit block 10; connecting rope 11; air storage chamber 12. DETAILED DESCRIPTION

[0024] like Figures 1 to 6 As shown, an expansion and contraction anti-loosening nut includes a nut 1 having a thread 2, and the thread 2 is arranged inside the nut 1. Figure 1 and Figure 2 As shown, the nut 1 is provided with an extrusion groove 4 inside, which penetrates downward along the top of the nut 1 and penetrates the thread 2, but does not penetrate to the bottom of the nut 1. The extrusion groove 4 penetrates the thread 2 and does not affect the installation of the nut 1 and the bolt. Figure 1 and Figure 2 As shown, the bottom of the extrusion groove 4 is provided with an extrusion strip 5 extending upward. Figure 6 The extruded strip 5 is provided with an air storage chamber 12 inside, and the air storage chamber 12 is filled with an antioxidant, which can delay the service life of the extruded strip 5. Since the outer part of the extruded strip 5 is made of rubber, the antioxidant filled inside can not only delay the oxidation of the extruded strip 5 but also serve as a filler to increase the expansion volume of the extruded strip 5. Figure 2 and Figure 4 As shown, an extrusion ring 3 is provided at the top of the extrusion strip 5. There is a gap between the extrusion ring 3 and the top of the nut 1. The gap is the moving stroke of the extrusion ring 3 when it is under pressure. When the extrusion ring 3 moves downward, the extrusion strip 5 is squeezed from the inside of the extrusion groove 4 to the middle position of the nut 1, so that the extrusion strip 5 expands. The expanded extrusion strip 5 can generate friction on the thread of the bolt, thereby playing a role in preventing loosening.

[0025] like Figures 1 to 5 As shown, the side of the nut 1 is provided with a pressure relief groove 6 connected to the extrusion groove 4, and a slidably connected pressure relief strip 7 is provided in the pressure relief groove 6. The function of the pressure relief strip 7 is to support the back of the extrusion strip 5, so that the extrusion strip 5 will expand toward the inside of the nut 1 when it is subjected to the extrusion force. When the bolt needs to be removed, in order to relieve the pressure of the extrusion strip 5, it is only necessary to take out the pressure relief strip 7, so that the extrusion strip 5 will automatically shrink in the direction away from the bolt, thereby facilitating the removal of the bolt from the nut 1. Figure 2 and Figure 4As shown, a fixing hole penetrating the pressure relief strip 7 is provided at the bottom of the nut 1, and a fixing rod 8 for fixing the pressure relief strip 7 is installed in the fixing hole. The fixing rod 8 is used to fix the pressure relief strip 7. Since the pressure relief strip 7 is also subjected to the extrusion force of the extrusion strip 5, the fixing rod 8 is also subjected to the thrust of the pressure relief strip 7 and remains in the pressure relief groove 6. When the pressure relief strip 7 needs to be taken out, it is only necessary to pull out the fixing rod 8. A protrusion is also provided at the bottom of the fixing rod 8 for the operator to grasp conveniently, and the protrusion protrudes from the bottom surface of the nut 1.

[0026] like Figure 3 and Figure 5 As shown, the pressure relief strip 7 is provided with a limit block 10 adapted to the pressure relief groove 6. The back surface of the limit block 10 is parallel to the side surface of the nut 1. When the fixing rod 8 is pulled out, the limit block 10 will protrude from the surface of the nut 1, which can be convenient for the operator to grab. A connecting rope 11 for pulling the extrusion strip 5 out of the extrusion groove 4 is provided between the pressure relief strip 7 and the extrusion strip 5. The connecting rope 11 can assist the pressure relief strip 7 to pull the extrusion strip 5 out of the extrusion groove 4, so that the extrusion strip 5 can be pulled out when it is aged. The number of connecting ropes 11 is greater than two and the length of the connecting rope 11 gradually increases from bottom to top. If the length of the connecting rope 11 is the same, a strong pulling force will be generated. Therefore, the lower extrusion strip 5 can be pulled out first by gradually increasing the length, and then the extrusion strip 5 can be slowly pulled out from bottom to top, which can save more effort and reduce the probability of breaking the extrusion strip 5.

[0027] like Figure 4 As shown, the top surface of the nut 1 is provided with a circumferentially distributed reset pad 9, which is located at the bottom of the extrusion ring 3. The reset pad 9 is made of rubber material and is used to support the extrusion ring 3 for rebound. When the bolt needs to be taken out of the nut, when the bolt is turned, the reset pad 9 made of solid rubber material can make the extrusion ring 3 rebound, thereby resetting the extrusion strip 4 and reducing the friction on the bolt.

[0028] The following two embodiments are used to briefly describe the method of using the utility model:

[0029] Example 1

[0030] When using the nut 1, the nut 1 is placed on one side of the workpiece to be fixed, and then a bolt (not shown in the figure) is taken out, and the bolt and the nut 1 are rotated and fixed. When the bolt is rotated close to the limit, the extrusion ring 3 will contact the side of the workpiece to be fixed to generate pressure, and the generated pressure will slowly increase as the bolt is gradually tightened. When the extrusion ring 3 generates pressure, the extrusion strip 5 will expand toward the inner circle of the nut 1 under pressure, thereby generating friction with the thread of the bolt to prevent loosening, and the extrusion strip 5 will expand and contract with the pressure of the extrusion ring 3, so even in a vibrating environment, the extrusion strip 5 can still have a good anti-loosening effect on the bolt.

[0031] Example 2

[0032] When the nut 1 needs to be separated from the bolt after being used for a long time, the fixing rod 8 is pulled out. In this way, the back of the extrusion strip 5 loses its supporting force and rebounds, thereby reducing the friction on the bolt thread, making it easier to separate the bolt from the nut 1. If the extrusion strip 5 ages and cannot rebound, at this time, the pressure relief strip 5 is pulled out of the pressure relief groove 6 by pulling the limit block 10. At the same time, the connecting rope 11 will pull the extrusion strip 5 backward, thereby separating the extrusion strip 5 from the bolt thread, further facilitating their separation. In addition, the connecting rope 11, which gradually becomes longer in length, can separate the extrusion strip 5 located below from the bolt first, thereby reducing the force on the extrusion strip 5 and slowly increasing the pulling force on the extrusion strip 5, which can not only reduce the probability of the extrusion strip 5 being broken, but also make the extrusion strip 5 more labor-saving to pull out.

Claims

1. An expansion and contraction locking nut, characterized in that: The invention comprises a nut (1) having a thread (2), wherein the top of the nut (1) is provided with a plurality of extrusion grooves (4) extending downward and penetrating the thread (2), the bottom of each of the extrusion grooves (4) is provided with an extrusion strip (5) extending upward, the top of the extrusion strip (5) is provided with an extrusion ring (3), a gap is provided between the bottom surface of the extrusion ring (3) and the top surface of the nut (1) so as to facilitate the extrusion ring (3) to move downward when pressed, and when the extrusion ring (3) moves downward under pressure, the extrusion strip (5) is pressed downward to expand toward the inside of the nut (1) to increase the friction force on the bolt.

2. The expansion and contraction locking nut according to claim 1 is characterized in that: The nut (1) is provided with a pressure relief groove (6) on the side thereof and connected to the extrusion groove (4); a slidably connected pressure relief strip (7) is provided in the pressure relief groove (6); the pressure relief strip (7) is used to provide a supporting force when the extrusion strip (5) expands inwardly; a fixing hole penetrating the pressure relief strip (7) is provided at the bottom of the nut (1); a fixing rod (8) for fixing the pressure relief strip (7) is installed in the fixing hole.

3. The expansion and contraction locking nut according to claim 2 is characterized in that: The bottom of the fixing rod (8) is provided with a protrusion for easy grasping by an operator, and the protrusion protrudes from the bottom surface of the nut (1).

4. The expansion and contraction locking nut according to claim 2, characterized in that: The pressure relief strip (7) is provided with a limit block (10) matched with the pressure relief groove (6), and the back surface of the limit block (10) is parallel to the side surface of the nut (1).

5. The expansion and contraction locking nut according to claim 2, characterized in that: A connecting rope (11) for pulling the extrusion strip (5) out of the extrusion groove (4) is provided between the pressure relief strip (7) and the extrusion strip (5).

6. The expansion and contraction locking nut according to claim 5, characterized in that: The number of the connecting ropes (11) is greater than two and the length of the connecting ropes (11) gradually increases from bottom to top.

7. The expansion and contraction locking nut according to claim 1, characterized in that: A circumferentially distributed reset pad (9) is provided on the top of the nut (1); the reset pad (9) is located at the bottom of the extrusion ring (3); the reset pad (9) is made of rubber material and is used to support the extrusion ring (3) for rebound.

8. The expansion and contraction lock nut according to any one of claims 1 to 7, characterized in that: An air storage cavity (12) is provided inside the extruded strip (5), and the air storage cavity (12) is filled with an antioxidant.

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