A self-locking lock needle structure

Abstract

The present application relates to the field of medical devices, and in particular to a self-locking lock needle structure, comprising a lock rod, the lock rod is provided with a support rod, one end of the support rod is fixedly installed with a support seat, the support seat is provided with a cylindrical countersunk hole, a push block is installed inside the inlet end of the cylindrical countersunk hole, the push block is provided with a conical countersunk hole, the outlet end of the cylindrical countersunk hole and the outlet end of the conical countersunk hole face opposite directions, a first sleeve and a second sleeve connected to each other are installed inside the conical countersunk hole, a plurality of spheres are embedded in the outer wall of the second sleeve along the circumferential direction, a support block is fixedly installed on one side of the support seat located at the outlet end of the cylindrical countersunk hole, a spring is provided between the support block and the second sleeve, the lock rod is slidably penetrated through the support block, the first sleeve and the second sleeve, the spring is used to drive the support block and the second sleeve away from each other, and the sphere is used to press against the inner wall of the outlet end of the conical countersunk hole and the rod body of the lock rod. The present application has the effect of reducing the occurrence of the lock rod being squeezed and bent.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a self-locking needle structure. Background Art

[0002] External fixation devices are one of the important tools for the clinical treatment of fractures and bone cracks, mainly including plate screw fixation, intramedullary nail fixation, external fixator, etc. Among them, external fixator is particularly commonly used in the treatment of complex fractures due to its adjustability and flexibility.

[0003] The external fixator is usually composed of a plurality of ring seats that are placed on the fracture site, and these ring seats are connected by connecting rods. At the same time, a locking rod is passed through the bone and fixed by a clamping mechanism. This device can effectively stabilize the fracture site, promote fracture healing, reduce surgical trauma, and improve the patient's recovery speed. In actual applications, in order to ensure that the locking rod can be firmly fixed on the bone, the common clamping mechanism adopts a screw rod and a support block. The specific operation is that the support block is connected to the ring seat, the locking rod passes through the support block, and then the screw rod is screwed into the support block to tighten the locking rod.

[0004] When fixing the two ends of the locking rod, there is a range of clamping force required for fixing the two ends of the locking rod. If the clamping force of the screw on the locking rod is greater than the clamping force range, the screw and the locking rod are squeezed against each other and easily deformed and damaged; if the clamping force of the screw on the locking rod is less than the clamping force range, the fixing effect of the locking rod is poor, thereby affecting the treatment effect of the fracture. However, after the screw is pressed against the locking rod and before the screw compresses the locking rod to reach the required clamping force, a slight rotation of the screw will cause the clamping force of the screw squeezing the locking rod to change dramatically, making it difficult for the doctor to control the clamping force of the screw on the locking rod within the clamping force range. Summary of the invention

[0005] In order to facilitate doctors to control the clamping force applied to the two ends of the locking rod for fixation, the present application provides a self-locking locking needle structure.

[0006] The present application provides a self-locking lock needle structure, which adopts the following technical solution:

[0007] The lock pin structure of claim 1, wherein the locking rod is provided with a support block, the support block having a cylindrical hole formed therein, and a push block is installed inside the inlet end of the cylindrical hole, the push block having a conical countersunk hole and an outlet end of the cylindrical hole facing in opposite directions. The outlet end of the cylindrical hole is provided with a first sleeve installed inside the inlet end of the cylindrical hole, and a second sleeve is installed inside the inlet end of the tapered countersunk hole. The first sleeve is fixedly connected to the second sleeve, and a plurality of balls are embedded in the outer wall of the second sleeve along the circumference of the second sleeve. The support seat is located at one side of the outlet end of the cylindrical hole and is fixedly installed with a support block, the support block and the second sleeve are provided with a spring between the support block and the second sleeve, the locking rod is slidably penetrated by the support block, the first sleeve and the second sleeve, the spring is used to drive the support block and the second sleeve to move away from each other, and the ball is used to tightly abut against the inner wall of the outlet end of the tapered countersunk hole and the rod body of the locking rod.

[0008] By adopting the above technical solution, after the locking rod passes through the bone, both ends of the locking rod pass through a support block and a support seat. Then, the push block, the first sleeve, the second sleeve, and the spring are installed on the support seat, and the spring drives the support block and the second sleeve to move away from each other, so that the ball is tightly pressed against the inner wall of the outlet end of the conical countersunk hole and the rod body of the locking rod. When the push block is installed inside the cylindrical countersunk hole, the elastic force of the spring on the second sleeve is controlled by controlling the distance between the push block and the support block, thereby controlling the pressing force of the ball on the locking rod. The doctor can observe the depth of the push block entering the cylindrical countersunk hole, so that it is convenient for the doctor to judge the pressing force on the two ends of the locking rod for fixing. Multiple balls are tightly pressed against the peripheral side of the locking rod, and the locking rod is evenly stressed. After the two ends of the locking rod are fixed, if the locking rod slides axially, the ball at one end of the locking rod will be further pressed, thereby playing a self-locking role.

[0009] Optionally, the push block thread is penetrated inside the inlet end of the cylindrical countersunk hole, and the first sleeve and the second sleeve are both slidably penetrated into the conical countersunk hole.

[0010] By adopting the above technical solution, the push block is rotated in and out of the cylindrical countersunk hole, so as to facilitate the adjustment of the distance between the push block and the support block. The position of the push block limits the distance of the first sleeve and the second sleeve from the support block after being pushed by the spring, so as to facilitate the adjustment of the elastic force of the spring on the second sleeve, and further facilitate the adjustment of the pressing force of the ball on the rod body of the locking rod.

[0011] Optionally, the push block is slidably disposed inside the inlet end of the cylindrical countersunk hole, the first sleeve is threadedly disposed inside the outlet end of the conical countersunk hole, and the second sleeve is slidably disposed inside the inlet end of the conical countersunk hole.

[0012] By adopting the above technical solution, when the push block is pushed close to the support block, the push block drives the first sleeve and the second sleeve to move together, thereby compressing the spring, increasing the elastic force of the spring on the second sleeve, and then gradually increasing the resistance to the push block. The doctor judges the elastic force of the spring by the resistance of the push block, and when the elastic force of the spring on the second sleeve reaches the required level, the push block is changed from pushing to rotating, so that the ball is pressed against the shaft of the locking rod to be fixed.

[0013] Optionally, a first limit groove is formed on the inner wall of the outlet end of the cylindrical countersunk hole, a limit block is slidably arranged inside the first limit groove, a push ring is fixedly installed on the side of the spring away from the support block, the side of the limit block close to the support block is inclined for the push ring to abut against, and a limit assembly is installed on the limit block, and the limit assembly is used to limit the limit block from retracting into the first limit groove.

[0014] By adopting the above technical solution, when the push block is rotated to make the ball press against the locking rod, the limit assembly limits the limit block from retracting into the first limit groove, thereby reducing the elastic force of the spring that pushes the second sleeve to slide. After the push block is rotated to make the ball press against the locking rod, the limit assembly is unlocked, and the spring squeezes the inclined side of the limit block through the push ring, and the limit block retracts into the first limit groove. When the limit block retracts into the first limit groove, the spring drives the push ring to press against the second sleeve, thereby facilitating the spring to apply an elastic force to the second sleeve and the support block to move away from each other, thereby facilitating the straightening and tightening of the locking rod.

[0015] Optionally, the limit assembly includes a first limit rod and a second limit rod, the inner wall of the outlet end of the cylindrical countersunk hole is axially provided with a second limit groove, the opening of the second limit groove is set toward the push block, the first limit groove is connected to the second limit groove, the first limit rod is slidably passed through the second limit groove, the end of the first limit rod away from the support block is fixedly connected to one end of the second limit rod, the outer wall of the first limit rod is abutted against the inner wall of the second limit groove, and the diameter of the second limit rod is smaller than the diameter of the first limit rod.

[0016] By adopting the above technical solution, the push block is rotated to slide toward the support block. After the push block abuts against the second limit rod, the push block is continued to be rotated to slide toward the support block, and the push block squeezes the first limit rod and the second limit rod to move toward the support block. After the first limit rod and the limit block are staggered, the limit block is squeezed back into the first limit groove by the push ring, and then the spring drives the push ring to press against the second sleeve. Let the spring press against the second sleeve, and the spring drives the second sleeve away from the support block, so that the ball is pressed against the lock rod for fixation. In the process of rotating the push block to move toward the support block, the spring applies elastic force to the limit block through the push ring, so that it is convenient for the ball to loosen the lock rod, thereby reducing the resistance of rotating the push block; after the distance between the second sleeve and the support block allows the elastic force provided by the spring to meet the requirement, the limit assembly is unlocked, so that it is convenient for the ball to press against the rod body of the lock rod for fixation.

[0017] Optionally, the second sleeve is pressed against a side of the limiting block away from the supporting block, and an end of the first limiting rod close to the second limiting rod is circumferentially inclined.

[0018] By adopting the above technical solution, during the movement of the first limit rod toward the support block, the limit block is continuously squeezed by the push ring. Affected by the inclination of the end of the first limit rod close to the second limit rod, the limit block gradually retracts into the first limit groove, and the push ring gradually moves toward the second sleeve driven by the spring, and then the push ring is grounded with the second sleeve, thereby reducing the vibration caused by the push ring hitting the second sleeve.

[0019] Optionally, a support plate is provided inside the outlet end of the cylindrical countersunk hole, the spring is fixedly installed between the support plate and the second sleeve, an adjustment component is installed between the support plate and the support block, the adjustment component is used to adjust the distance between the support plate and the support block, and the locking rod slides through the support plate.

[0020] By adopting the above technical solution, in the process of tightening the push block to make the ball press against the lock rod, the adjustment component drives the support plate close to the support block, thereby reducing the thrust of the spring on the second sleeve, and then facilitating the tightening of the push block to make the ball press against the lock rod. After tightening the push block to make the ball press against the lock rod, the adjustment component drives the support plate away from the support block, thereby increasing the thrust of the spring on the second sleeve, and then facilitating the lock rod to straighten, thereby increasing the strength of the lock rod.

[0021] Optionally, the adjustment assembly includes a first adjustment tube, the first adjustment tube threadedly penetrates the support block, the first adjustment tube is connected to the support plate, and the locking rod is slidably disposed through the first adjustment tube.

[0022] By adopting the above technical solution, the first adjusting tube is rotated, and the first adjusting tube moves along the length direction of the locking rod, thereby conveniently driving the supporting plate to approach or move away from the supporting block.

[0023] Optionally, the adjusting assembly also includes a second adjusting tube, a first slider and a second slider, and there are multiple first adjusting tubes and first sliders, and the multiple first adjusting tubes and second adjusting tubes are threadedly sleeved in sequence from the inside to the outside, and the first slider is fixedly installed on the outer wall of the first adjusting tube, and the inner wall of the outlet end of the cylindrical countersunk hole is provided with a first sliding groove and a first annular groove for the first slider to slide, and the first sliding groove is arranged along the length direction of the locking rod, and the end of the first sliding groove close to the push block is connected to the first annular groove, and the length of the first sliding groove corresponding to the first adjusting tube decreases from the inside to the outside, and the support block is provided with a rotating hole for the second adjusting tube to pass through, and the second sliding block is fixedly installed on the outer wall of the second adjusting tube, and the inner wall of the rotating hole is provided with a second annular groove for the second sliding block to slide.

[0024] By adopting the above technical solution, the second adjusting tube is rotated, and the second adjusting tube drives the first adjusting tube to rotate. Since the first slider and the first slide groove are mutually engaged, the first adjusting tube close to the second adjusting tube cannot be rotated, so that the first adjusting tube slides toward the push block. After the first slider enters the first ring groove from the first slide groove, another first adjusting tube begins to move toward the push block. By extending the first adjusting tubes from the outside to the inside in sequence, it is convenient to adjust the pressure of the spring squeezing the second adjusting tube. By mutually sleeved multiple first adjusting tubes and second adjusting tubes, the occupied space is reduced.

[0025] Optionally, a plurality of second sliding grooves are provided on the inner wall of the outlet end of the cylindrical countersunk hole, and the second sliding grooves are arranged along the length direction of the locking rod, and the end of the second sliding groove away from the push block is connected to the first annular groove, and a card block is slidingly arranged inside the second sliding groove, and the rotation direction of the first adjusting tube toward the push block is the forward rotation direction, and the rotation direction of the first adjusting tube away from the push block is the reverse direction, and the side of the card block facing the forward rotation direction is flush with the inner wall of the first sliding groove facing the reverse direction, and the side of the card block facing the reverse direction is inclined.

[0026] By adopting the above technical solution, when the first adjusting tube needs to move away from the push block, the second adjusting tube is rotated, and the second adjusting tube drives the first adjusting tube to rotate. When the first slider squeezes the block toward the side of the forward rotation direction, the second adjusting tube cannot continue to rotate, so that the first slider returns from the annular groove to the inside of the first slide groove, thereby facilitating the first adjusting tube to move away from the push block.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] When the multiple balls are pressed and fixed on the periphery of the locking rod, the doctor adjusts the distance between the push block and the support block, thereby adjusting the length of the spring compression. By adjusting the length of the spring compression, the doctor can adjust the elastic force of the spring on the second sleeve, thereby facilitating the doctor to control the pressing force on both ends of the locking rod for fixation.

[0029] Before the ball presses against the locking rod, the limit assembly limits the limit block to retract into the first limit groove, and the limit block limits the push ring, thereby reducing the thrust of the push ring on the second sleeve, and then facilitating the tightening of the push block to make the ball press against the locking rod. After the ball presses against the locking rod, the limit assembly is unlocked, and the push ring squeezes the inclined side of the limit block, and the limit block retracts into the first limit groove. Then, the push ring is driven by the spring to press against the second sleeve, and the second sleeve is stretched and straightened through the ball to drive the locking rod, thereby improving the strength of the locking rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the structure of the locking pin structure of Example 1 of the present application installed on the human skeleton;

[0031] Figure 2 yes Figure 1 A cross-sectional view taken along the length direction of the locking rod;

[0032] Figure 3 yes Figure 2 A magnified view at point A;

[0033] Figure 4 is a schematic diagram of the structure of the locking pin structure of Example 2 of the present application installed on the human skeleton;

[0034] Figure 5 yes Figure 4 A cross-sectional view taken along the length direction of the locking rod;

[0035] Figure 6 yes Figure 5 Enlarged view at B;

[0036] Figure 7 It is a schematic diagram of the overall structure of Example 3 of the present application;

[0037] Figure 8 yes Figure 7 A cross-sectional view taken along the length direction of the locking rod;

[0038] Fig. 9 yes Figure 8 Enlarged view at C;

[0039] Fig.10 It is a schematic diagram of the overall structure of Example 4 of the present application;

[0040] Fig.11 yes Fig.10 A cross-sectional view taken along the length direction of the locking rod;

[0041] Fig.12 It is a partial structural diagram of Example 4 of the present application;

[0042] Fig.13 yes Fig.12 Sectional view at AA;

[0043] Fig.14 yes Fig.13 Enlarged view at C.

[0044] Explanation of the accompanying drawings: 1. locking rod; 2. supporting rod; 3. supporting seat; 4. cylindrical countersunk hole; 5. conical countersunk hole; 6. push block; 7. first sleeve; 8. second sleeve; 9. sphere; 10. supporting block; 11. spring; 12. first limiting groove; 13. limiting block; 14. push ring; 15. limiting assembly; 151. first limiting rod; 152. second limiting rod; 16. second limiting groove; 17. supporting plate; 18. adjusting assembly; 181. first adjusting tube; 182. second adjusting tube; 183. first slider; 184. second slider; 19. first slide groove; 20. first annular groove; 21. rotating hole; 22. second annular groove; 23. second slide groove; 24. clamping block. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-14 This application is described in further detail.

[0046] Example 1.

[0047] The embodiment of the present application discloses a self-locking lock needle structure.

[0048] Reference Figure 1 A self-locking lock needle structure includes a lock rod 1, and the lock rod 1 is provided with a support rod 2. In the embodiment of the present application, both ends of the lock rod 1 have support rods 2. One end of the support rod 2 is used to connect with the ring seat, and the other end of the support rod 2 is fixedly installed with a support seat 3.

[0049] Reference Figure 2 , Figure 3 The support seat 3 is provided with a cylindrical countersunk hole 4, and the support seat 3 is provided with a push block 6, and the push block 6 is provided with a conical countersunk hole 5. The end with a larger inner diameter of the cylindrical countersunk hole 4 and the conical countersunk hole 5 is the inlet end, and the end with a smaller inner diameter of the cylindrical countersunk hole 4 and the conical countersunk hole 5 is the outlet end. The outlet end of the cylindrical countersunk hole 4 and the outlet end of the conical countersunk hole 5 face opposite directions. In an embodiment of the present application, the outlet end of the conical countersunk hole 5 faces the bone. In another embodiment, the outlet end of the conical countersunk hole 5 is set away from the bone.

[0050] Reference Figure 3 , the push block 6 is threadedly penetrated at the inlet end of the cylindrical countersunk hole 4. The outlet end of the tapered countersunk hole 5 is slidably penetrated by a first sleeve 7, and the inlet end of the tapered countersunk hole 5 is slidably penetrated by a second sleeve 8. The outer diameter of the second sleeve 8 changes with the inner diameter of the outlet end of the tapered countersunk hole 5, and one end of the first sleeve 7 is fixedly connected to one end of the second sleeve 8. The locking rod 1 is penetrated by the first sleeve 7 and the second sleeve 8. The outer wall of the second sleeve 8 is embedded with a plurality of spheres 9 along the circumferential direction, and the spheres 9 are used to tightly abut against the inner wall of the outlet end of the tapered countersunk hole 5 and the rod body of the locking rod 1.

[0051] A support block 10 is fixedly installed on one side of the support seat 3 located at the outlet end of the cylindrical countersunk hole 4, and the support block 10 is located inside the outlet end of the cylindrical countersunk hole 4, and a spring 11 is fixedly installed between the support block 10 and the second sleeve 8. The spring 11 is inserted into the cylindrical countersunk hole 4, and the locking rod 1 slides through the support block 10. The spring 11 is used to drive the support block 10 and the second sleeve 8 to move away from each other.

[0052] The implementation principle of the self-locking needle locking structure of the embodiment of the present application is as follows: before the operation begins, the push block 6, the first sleeve 7, the second sleeve 8 and the spring 11 are pre-installed on the support seat 3. At the beginning of the operation, the locking rod 1 passes through the bone, and then the end of the locking rod 1 passes through the first sleeve 7, the second sleeve 8, the spring 11 and the support block 10 in sequence, and then the support rod 2 is connected to the ring seat for fixing.

[0053] After the support rod 2 is fixed to the ring seat, the push block 6 is rotated to move toward the support block 10. Due to the inclination of the outer wall of the second sleeve 8 and the inlet inner wall of the conical countersunk hole 5, the push block 6 drives the first sleeve 7 and the second sleeve 8 to move toward the support block 10 together.

[0054] As the second sleeve 8 moves toward the support block 10, the second sleeve 8 squeezes the spring 11, and the spring 11 applies elastic force to the second sleeve 8. The spring 11 applies elastic force to the second sleeve 8, and the second sleeve 8 slides away from the support block 10 inside the tapered countersunk hole 5, and the ball 9 is squeezed by the inner wall of the entrance end of the tapered countersunk hole 5, so that the ball 9 is tightly pressed against the lock rod 1, thereby facilitating the fixing of both ends of the lock rod 1. The lock rod 1 is evenly stressed by the ball 9 being pressed against the peripheral side of the lock rod 1 for fixing.

[0055] When the doctor rotates the push block to approach the support block, the doctor can clearly see the change in the distance between the push block and the support block, thereby facilitating the adjustment of the elastic force of the spring on the second sleeve, and further facilitating the control of the clamping force at both ends of the locking rod.

[0056] Compared with the existing method of fixing the locking rod 1 by pressing the screw, the doctor may need to repeatedly loosen and tighten the screw during the operation to adjust the pressing force of the screw on the locking rod 1. A slight rotation of the screw will cause a large change in the pressing force, which will increase the difficulty of the doctor's adjustment and thus prolong the operation time. However, the present application rotates the push block 6, and the push block 6 moves toward the support block 10, thereby changing the compression length of the spring 11. The change in the pressing force caused by the rotation of the push block 6 of the present application is less than the change in the pressing force caused by the rotation of the screw, which is conducive to reducing the time of repeatedly loosening and tightening the push block 6, thereby reducing the operation time.

[0057] At the same time, when medical devices are produced, there may be defective products, and doctors cannot determine whether they are defective products and continue to use them. When the screw of the prior art presses the locking rod 1, if the screw is defective, and the screw is squeezed by external force, this may cause the screw to easily spin and loosen the locking rod 1. However, the push block 6 of the present application has defects. During use, when the push block 6 spins away from the support block 10, the spring 11 will continue to press the second sleeve 8, thereby playing a good fixing role on both ends of the locking rod 1. At the same time, the spring 11 applies an elastic force to the second sleeve 8 away from the support block 10 to self-lock, thereby reducing the situation where the push rod drives the second sleeve 8 to move toward the support block 10 after the locking rod 1 is pushed by an external force.

[0058] When the two ends of the locking rod 1 are fixed, generally one end is fixed first and then the other end. After one end of the locking rod 1 is fixed, when the other end of the locking rod 1 is fixed, the push block 6 is rotated to move toward the support block 10. As the elastic force of the spring 11 on the second sleeve 8 gradually increases, the pressing force of the ball 9 on the locking rod 1 also gradually increases. After the pressing force of the ball 9 on the locking rod 1 reaches the required pressing force, the doctor will stop rotating the push block 6 to move toward the support block 10. After the ball 9 is pressed against the locking rod 1 and before the doctor stops rotating the push block 6 to move toward the support block 10, the push block 6 will also drive the second sleeve 8 to move toward the support block 10. The ball 9 is pressed against the locking rod 1, so when the second sleeve 8 moves toward the support block 10, the locking rod 1 will be subjected to a tensile force, thereby straightening the locking rod 1 and improving the strength of the locking rod 1.

[0059] Generally, the fixing effect of the locking rod 1 on the bone is affected by the strength of the locking rod 1. The higher the strength of the locking rod 1, the better the fixing effect of the bone. The method to improve the strength of the locking rod 1 is generally to increase the diameter of the locking rod 1. However, after increasing the diameter of the locking rod 1, the wound caused by the locking rod 1 passing through the bone is larger and easy to be infected. The present application improves the strength of the locking rod 1 by tightening and straightening the two ends of the locking rod 1, thereby reducing the diameter of the locking rod 1, and further reducing the occurrence of infection.

[0060] At least two locking rods 1 are inserted into the bones on both sides of the fracture site, and the angle between the two locking rods 1 is less than 180°, preferably 90°, so as to reduce the occurrence of bone slippage along the length direction of the locking rods 1 due to force.

[0061] Example 2.

[0062] The embodiment of the present application discloses a self-locking lock needle structure.

[0063] Reference Figure 4 , Figure 5 , Figure 6The difference between the self-locking pin structure of the embodiment of the present application and the embodiment 1 is that the push block 6 is slidably inserted into the inlet end of the cylindrical countersunk hole 4, the first sleeve 7 is threadedly inserted into the outlet end of the conical countersunk hole 5, and the second sleeve 8 is slidably inserted into the inlet end of the conical countersunk hole 5. In the embodiment of the present application, the outlet end of the conical countersunk hole 5 is set away from the bone. The support block 10 is located outside the outlet end of the cylindrical countersunk hole 4.

[0064] The implementation principle of the self-locking lock pin structure of the embodiment of the present application is: the lock rod 1 passes through the bone, and then the spring 11, the support seat 3 and the push block 6 are sequentially inserted into the two ends of the lock rod 1. Then the support rod 2 is fixed to the ring seat.

[0065] After the support rod 2 is fixed to the ring seat, the doctor pushes the push block 6 to move toward the support block 10, and the push block 6 drives the second sleeve 8 to squeeze the spring 11. The spring 11 applies elastic force to the second sleeve 8, and the elastic force applied to the second sleeve 8 is applied to the push block 6 through the first sleeve 7, so that the doctor can understand the elastic force of the spring 11 on the second sleeve 8, and then adjust the pressing force of the ball 9 on the locking rod 1.

[0066] After the elastic force of the spring 11 reaches the required elastic force, the two ends of the lock rod 1 are fixed successively. When fixing one end of the lock rod 1, the first sleeve 7 is pressed and fixed, so that the first sleeve 7 does not rotate or move, and then the push block 6 is rotated to move toward the support block 10, so that the ball 9 is pressed against the inner wall of the entrance end of the tapered countersunk hole 5, and then the ball 9 is pressed against the rod body of the lock rod 1. By preventing the first sleeve 7 from moving with the push block 6, the situation in which the ball 9 is pressed against the lock rod 1 and the lock rod 1 is moved together with the push block 6 is reduced.

[0067] When fixing the other end of the locking rod 1, the push block 6 is pressed and does not rotate. Then the first sleeve 7 is rotated away from the support block 10, and the ball 9 is pressed against the inner wall of the entrance end of the tapered countersunk hole 5, so that the ball 9 presses the locking rod 1, thereby fixing the other end of the locking rod 1. Since the ball 9 will gradually press against the locking rod 1, when the first sleeve 7 moves away from the support block 10, the first sleeve 7 will pull the locking rod 1. However, one end of the locking rod 1 is already fixed, and after the other end of the locking rod 1 is pulled, the locking rod 1 is straightened, thereby improving the strength of the locking rod 1.

[0068] Example 3.

[0069] The embodiment of the present application discloses a self-locking lock needle structure.

[0070] Reference Figure 7 , Figure 8 , Fig. 9The difference between the self-locking lock pin structure of the embodiment of the present application and the embodiment 1 is that the support block 10 is located outside the outlet end of the cylindrical countersunk hole 4. The inner wall of the outlet end of the cylindrical countersunk hole 4 is provided with a first limiting groove 12, and a limiting block 13 is slidably arranged inside the first limiting groove 12. A push ring 14 is fixedly installed on the side of the spring 11 away from the support block 10, and the side of the limiting block 13 close to the support block 10 is inclined for the push ring 14 to abut. The limiting block 13 is provided with a limiting assembly 15.

[0071] Reference Figure 8 , Fig. 9 The limiting assembly 15 includes a first limiting rod 151 and a second limiting rod 152, and a second limiting groove 16 is axially provided on the inner wall of the outlet end of the cylindrical countersunk hole 4. The opening of the second limiting groove 16 is arranged toward the push block 6, and the first limiting groove 12 is connected with the second limiting groove 16. The first limiting rod 151 is slidably arranged in the second limiting groove 16, and the end of the first limiting rod 151 away from the support block 10 is fixedly connected with one end of the second limiting rod 152. The outer wall of the first limiting rod 151 is pressed against the inner wall of the second limiting groove 16, and the diameter of the second limiting rod 152 is smaller than the diameter of the first limiting rod 151. The second sleeve 8 is pressed against the side of the limiting block 13 away from the support block 10, and the end of the first limiting rod 151 close to the second limiting rod 152 is circumferentially inclined.

[0072] The implementation principle of a self-locking lock pin structure in the embodiment of the present application is as follows: the spring 11 drives the push ring 14 to squeeze the inclined side of the limit block 13, and the first limit rod 151 limits the limit block 13, so that it remains extended out of the first limit groove 12, and then the second sleeve 8 is separated from the push ring 14. The push block 6 is rotated to move toward the support block 10, and the push block 6 abuts against the end of the second limit rod 152 away from the first limit rod 151. Since the ball 9 has not yet pressed against the lock rod 1, the lock rod 1 and the second sleeve 8 can still slide relative to each other, thereby reducing the resistance of the push block 6 screwing into the entrance end of the cylindrical countersunk hole 4.

[0073] After the push block 6 abuts against the end of the second limiting rod 152 away from the first limiting rod 151, the push block 6 continues to rotate toward the support block 10, and the push block 6 pushes the second limiting rod 152 to move toward the support block 10. After the first limiting rod 151 is offset from the limiting block 13, the spring 11 presses the inclined side of the limiting block 13 through the push ring 14, so that the limiting block 13 retracts into the first limiting groove 12. Then the spring 11 drives the push ring 14 to press the second sleeve 8, so that the ball 9 is tightly pressed against the rod body of the locking rod 1.

[0074] After the ball 9 is pressed against the rod of the locking rod 1 , the push block 6 is continuously rotated to move toward the support block 10 , so that the ball 9 is further pressed against the rod of the locking rod 1 .

[0075] In the process of the rotating push block 6 moving toward the support block 10, when the limit block 13 is not retracted into the first limit groove 12, the ball 9 does not abut against the lock rod 1, thereby facilitating the movement of the rotating push block 6. When the limit block 13 is retracted into the first limit groove 12, the ball 9 abuts against the lock rod 1, thereby stretching the lock rod 1 when the rotating push block 6 moves.

[0076] The embodiment of the present application can be combined with embodiment 2 to facilitate the movement of the push block 6 toward the support block 10 .

[0077] Example 4.

[0078] The embodiment of the present application discloses a self-locking lock needle structure.

[0079] Reference Fig.10 , Fig.11 The difference between the self-locking lock pin structure of the embodiment of the present application and the embodiment 1 is that the support block 10 is located outside the outlet end of the cylindrical countersunk hole 4. A support plate 17 is provided inside the outlet end of the cylindrical countersunk hole 4, the lock rod 1 slides through the support plate 17, and the spring 11 is fixedly installed between the support plate 17 and the second sleeve 8. An adjustment component 18 is provided between the support plate 17 and the support block 10.

[0080] Reference Fig.11 , Fig.12 , Fig.13 The adjustment assembly 18 includes a first adjustment tube 181, a second adjustment tube 182, a first slider 183 and a second slider 184. There are multiple first adjustment tubes 181 and multiple first sliders 183. The multiple first adjustment tubes 181 and second adjustment tubes 182 are threadedly sleeved from the inside to the outside. The first adjustment tube 181 located in the middle is fixedly connected to the support plate 17, and the locking rod 1 slides through the first adjustment tube 181 located in the middle.

[0081] The first slider 183 is fixedly mounted on the outer wall of the first adjustment tube 181 near the push block 6, and the inner wall of the outlet end of the cylindrical countersunk hole 4 is provided with a first slide groove 19 and a first annular groove 20 for the first slider 183 to slide. The first slide groove 19 is arranged along the length direction of the locking rod 1, and the end of the first slide groove 19 near the push block 6 is connected to the first annular groove 20. The length of the first slide groove 19 corresponding to the first adjustment tube 181 decreases from the inside to the outside. The support block 10 is provided with a rotating hole 21 for the second adjustment tube 182 to pass through. The second slider 184 is fixedly mounted on the outer wall of the second adjustment tube 182, and the inner wall of the rotating hole 21 is provided with a second annular groove 22 for the second slider 184 to slide.

[0082] Reference Fig.11 , Fig.14The inner wall of the outlet end of the cylindrical countersunk hole 4 is provided with a plurality of second slide grooves 23, and the second slide grooves 23 are arranged along the length direction of the lock rod 1. The end of the second slide groove 23 away from the push block 6 is connected to the first annular groove 20, and a clamping block 24 is slidably arranged inside the second slide groove 23. The rotation direction of the first adjustment tube 181 moving toward the push block 6 is the forward rotation direction, and the rotation direction of the first adjustment tube 181 away from the push block 6 is the reverse rotation direction. The side of the clamping block 24 facing the forward rotation direction is flush with the inner wall of the first slide groove 19 facing the reverse rotation direction, and the side of the clamping block 24 facing the reverse rotation direction is inclined.

[0083] The implementation principle of a self-locking lock pin structure in the embodiment of the present application is as follows: before the ball 9 presses the lock rod 1, each first adjustment tube 181 is away from the second sleeve 8, so that the support plate 17 is away from the second sleeve 8. After the support plate 17 is away from the second sleeve 8, the elastic force of the spring 11 on the second sleeve 8 is reduced, so that it is convenient to tighten the push block 6 to make the ball 9 close to the lock rod 1.

[0084] After the ball 9 is pressed against the locking rod 1, the second adjusting tube 182 is rotated in the forward direction. As the second slider 184 moves inside the second annular groove 22, the first slider 183 and the first slide groove 19 are mutually engaged, so that the second adjusting tube 182 can rotate, while the first adjusting tube 181 cannot rotate. Then the first adjusting tube 181 moves toward the push block 6, thereby increasing the distance between the support plate 17 and the support block 10. After the first slider 183 enters the first annular groove 20 from the first slide groove 19, the second adjusting tube 182 continues to rotate in the forward direction, and the first adjusting tube 181 rotates in the forward direction along with the second adjusting tube 182.

[0085] When the first slider 183 slides inside the first annular groove 20, if the first adjusting tube 181 rotates in the forward direction with the second adjusting tube 182, the first slider 183 will squeeze the inclined side of the block 24, so that the block 24 retracts into the second slide groove 23; if the first adjusting tube 181 rotates in the reverse direction with the second adjusting tube 182, the first slider 183 will squeeze the straight side of the block 24, and the block 24 blocks the movement of the first slider 183, and then the first slider 183 enters the first slide groove 19 from the first annular groove 20, so that the first adjusting tube 181 is away from the push block 6, thereby facilitating the reduction of the distance between the support block 10 and the support plate 17.

[0086] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-locking needle lock structure, characterized in that: The invention comprises a locking rod (1), wherein the locking rod (1) is provided with a supporting rod (2), one end of the supporting rod (2) is fixedly mounted with a supporting seat (3), the supporting seat (3) is provided with a cylindrical countersunk hole (4), a push block (6) is installed inside the inlet end of the cylindrical countersunk hole (4), the push block (6) is provided with a conical countersunk hole (5), the outlet end of the cylindrical countersunk hole (4) and the outlet end of the conical countersunk hole (5) face in opposite directions, a first sleeve (7) is installed inside the outlet end of the conical countersunk hole (5), a second sleeve (8) is installed inside the inlet end of the conical countersunk hole (5), and the first sleeve (7) is installed inside the outlet end of the conical countersunk hole (5). ) is fixedly connected to the second sleeve (8), the outer wall of the second sleeve (8) is embedded with a plurality of spheres (9) along the circumferential direction, the support seat (3) is fixedly mounted with a support block (10) on one side of the outlet end of the cylindrical countersunk hole (4), a spring (11) is arranged between the support block (10) and the second sleeve (8), the locking rod (1) is slidably arranged through the support block (10), the first sleeve (7) and the second sleeve (8), the spring (11) is used to drive the support block (10) and the second sleeve (8) to move away from each other, and the spheres (9) are used to press against the inner wall of the outlet end of the conical countersunk hole (5) and the rod body of the locking rod (1); The push block (6) is threadedly inserted into the inlet end of the cylindrical countersunk hole (4), and the first sleeve (7) and the second sleeve (8) are both slidably inserted into the conical countersunk hole (5); A first limiting groove (12) is formed on the inner wall of the outlet end of the cylindrical countersunk hole (4); a limiting block (13) is slidably arranged inside the first limiting groove (12); a push ring (14) is fixedly installed on the side of the spring (11) away from the support block (10); a side of the limiting block (13) close to the support block (10) is inclined for the push ring (14) to abut against; a limiting assembly (15) is installed on the limiting block (13); and the limiting assembly (15) is used to limit the limiting block (13) from retracting into the first limiting groove (12); The limiting assembly (15) comprises a first limiting rod (151) and a second limiting rod (152); the inner wall of the outlet end of the cylindrical countersunk hole (4) is provided with a second limiting groove (16) along the axial direction; the opening of the second limiting groove (16) is arranged toward the push block (6); the first limiting groove (12) is communicated with the second limiting groove (16); the first limiting rod (151) is slidably arranged in the second limiting groove (16); one end of the first limiting rod (151) away from the support block (10) is fixedly connected to one end of the second limiting rod (152); the outer wall of the first limiting rod (151) is in contact with the inner wall of the second limiting groove (16); the diameter of the second limiting rod (152) is smaller than the diameter of the first limiting rod (151).

2. A self-locking needle lock structure according to claim 1, characterized in that: The second sleeve (8) is in contact with a side of the limiting block (13) away from the supporting block (10), and one end of the first limiting rod (151) close to the second limiting rod (152) is circumferentially inclined.

3. A self-locking needle lock structure according to claim 1, characterized in that: A support plate (17) is provided inside the outlet end of the cylindrical countersunk hole (4); the spring (11) is fixedly installed between the support plate (17) and the second sleeve (8); an adjustment component (18) is installed between the support plate (17) and the support block (10); the adjustment component (18) is used to adjust the distance between the support plate (17) and the support block (10); and the locking rod (1) slides through the support plate (17).

4. A self-locking needle lock structure according to claim 3, characterized in that: The adjustment assembly (18) comprises a first adjustment tube (181), the first adjustment tube (181) is threadedly passed through the support block (10), the first adjustment tube (181) is connected to the support plate (17), and the locking rod (1) is slidably disposed through the first adjustment tube (181).

5. A self-locking needle lock structure according to claim 4, characterized in that: The adjustment assembly (18) further comprises a second adjustment tube (182), a first slider (183) and a second slider (184); the first adjustment tube (181) and the first slider (183) are both provided in plurality; the plurality of the first adjustment tubes (181) and the second adjustment tubes (182) are threadedly sleeved in sequence from the inside to the outside; the first slider (183) is fixedly mounted on the outer wall of the first adjustment tube (181); the inner wall of the outlet end of the cylindrical countersunk hole (4) is provided with a first slide groove (19) and a first annular groove (20) for the first slider (183) to slide; The first slide groove (19) is arranged along the length direction of the locking rod (1), and one end of the first slide groove (19) close to the push block (6) is connected to the first annular groove (20). The length of the first slide groove (19) corresponding to the first adjustment tube (181) decreases from the inside to the outside. The support block (10) is provided with a rotating hole (21) for the second adjustment tube (182) to pass through. The second sliding block (184) is fixedly installed on the outer wall of the second adjustment tube (182), and the inner wall of the rotating hole (21) is provided with a second annular groove (22) for the second sliding block (184) to slide.

6. A self-locking needle structure according to claim 5, characterized in that: A plurality of second slide grooves (23) are provided on the inner wall of the outlet end of the cylindrical countersunk hole (4). The second slide grooves (23) are arranged along the length direction of the locking rod (1). The end of the second slide groove (23) away from the push block (6) is connected to the first annular groove (20). A clamping block (24) is slidably arranged inside the second slide groove (23). The rotation direction of the first adjusting tube (181) moving toward the push block (6) is the forward rotation direction, and the rotation direction of the first adjusting tube (181) away from the push block (6) is the reverse rotation direction. The side of the clamping block (24) facing the forward rotation direction is flush with the inner wall of the first slide groove (19) facing the reverse rotation direction, and the side of the clamping block (24) facing the reverse rotation direction is inclined.

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