Self-locking screw fastener

Abstract

The utility model discloses a self-locking type screw fastener, and particularly relates to the technical field of screw fastening, the self-locking type screw fastener mainly comprises a screw rod, a nut and a support ring, the nut is in threaded connection with the outer wall of the screw rod, the support ring is fixed at the bottom end of the nut, and the bottom end of the support ring is provided with a fitting locking mechanism; the attaching and locking mechanism comprises a plurality of supporting columns fixedly arranged at the bottom end of the supporting ring, and a heat shrink tube fixedly connected with the supporting ring is arranged in a gap defined by the supporting columns. According to the utility model, the fitting locking mechanism is adopted, after fastening, the heat shrinkable tube, the heat shrinkable fitting tube, the heat shrinkable sleeve and the wrapping heat shrinkable tube are heated by a lighter, and the wrapping heat shrinkable tube and the heat shrinkable sleeve can realize shrinkage operation in a thread gap on the outer wall of the screw rod; the heat shrink tube, the heat shrink fitting tube, the heat shrink sleeve and the wrapping heat shrink tube can be tightly attached to the outer wall of the screw, heating and automatic locking operation is firmly achieved, and locking between the screw and the nut is firmer.

Description

Technical Field

[0001] The utility model relates to the technical field of screw fastening, and more specifically, to a self-locking screw fastener. Background Art

[0002] Self-locking screw fasteners can form a tight and stable connection by engaging the internal threads of the connecting parts through their own threads without external force. This self-locking effect is achieved through the friction between the threads and the connected materials, ensuring the firmness of the connection.

[0003] After searching the existing public documents, the patent with patent announcement number CN110307235A discloses a hexagon socket screw fastener, which can flow from the oil inlet of the side wall of the screw into the inside of the oil storage chamber through the rubber cup when the lubricating oil flows out. When disassembling, the nut is loosened by pressing the pressure plate to separate from the plate, and the angle between the two connecting plates becomes smaller, the push rod moves toward the fixed block, the rubber cup is reset, and the pressure rod squeezes the oil intercepted from the inside of the oil storage chamber to the side wall of the screw for lubrication, which facilitates the disassembly of the nut; however, the fastener has the following defects;

[0004] When fasteners are in use, they need to be locked through thread engagement. However, in some bolt positions that do not require disassembly, it is difficult to fit tightly to achieve the locking operation. This makes it difficult to lock the screw fasteners firmly and the locking effect is poor. For this reason, self-locking screw fasteners are needed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a self-locking screw fastener.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-locking screw fastener, comprising a screw rod, a nut and a support ring, the nut being threadedly connected to the outer wall of the screw rod, the support ring being fixed to the bottom end of the nut, and the bottom end of the support ring being provided with a fitting locking mechanism; the fitting locking mechanism comprising a plurality of pillars fixedly arranged at the bottom end of the support ring, a heat shrinkable tube fixedly connected to the support ring being provided in a gap surrounded by the plurality of pillars, and the bottom end of the heat shrinkable tube being fixedly connected with a heat shrinkable fitting tube; a heat shrinkable sleeve being fixedly installed at the bottom end of the heat shrinkable fitting tube, and a reinforcement ring being fixedly connected to the outer wall of the heat shrinkable sleeve, a plurality of reinforcement rods being fixedly installed on the upper surface of the reinforcement ring, and a wrapped heat shrinkable tube being adhesively fixed to the bottom end of the reinforcement ring.

[0007] Preferably, the heat shrink tube, the heat shrink fitting tube and the heat shrink sleeve are all slidably connected to the outside of the screw, and the inner wall of the wrapped heat shrink tube is slidably connected to the outside of the screw, the heat shrink tube and the heat shrink fitting tube are both made of polyethylene, and the heat shrink sleeve and the wrapped heat shrink tube are both made of polyethylene. A rotating cap is fixedly installed at the top of the screw, and the cross-sectional shape of the rotating cap is polygonal.

[0008] When tightening, the present technical solution inserts the screw into the device, and the nut can be threadedly connected and extruded on the outer wall of the screw. After tightening, the heat shrink tube, the heat shrink adhesive tube, the heat shrink sleeve and the wrapped heat shrink tube are heated with a lighter, and the heat shrink tube and the heat shrink adhesive tube will shrink in the thread gap of the outer wall of the screw. The nut supports the support ring, the support ring supports multiple pillars, the heat shrink adhesive tube supports multiple reinforcement rods, the reinforcement rod supports the reinforcement ring, and the heat shrink tube, the heat shrink adhesive tube, the heat shrink sleeve and the wrapped heat shrink tube can fit tightly on the outer wall of the screw to prevent the nut from moving down.

[0009] Preferably, a protective flow guide assembly is installed on the upper surface of the nut;

[0010] The protective guide assembly includes a plurality of connecting rods installed on the upper surface of the nut, the top of the connecting rod is fixedly connected to a limiting ring, the bottom end of the limiting ring and close to its inner wall is fixedly connected to a guide limiting ring, and a limiting support ring is fixedly connected between the guide limiting ring and the nut; a wrapping sleeve is bonded and fixed to the upper surface of the limiting ring, the inner walls of the guide limiting ring and the limiting support ring are both smooth surfaces, and the guide limiting ring and the limiting support ring are both made of stainless steel, a circular gap is provided between the wrapping sleeve and the screw, and the inner wall diameter of the top end of the wrapping sleeve is larger than the inner wall diameter of the bottom end.

[0011] When the present technical solution is being tightened, the rotation of the nut will drive multiple connecting rods to move upward, the nut will drive the limit support ring to move upward, the diversion limit ring will move upward, the limit ring carries the wrapping sleeve and is squeezed on the upper surface of the object, when external rainwater contacts the object and flows down, it will be quickly diverted along the outer wall of the wrapping sleeve to prevent water from entering the gap between the screw and the nut, quickly diverting water and avoiding corrosion damage.

[0012] Technical effects and advantages of the utility model:

[0013] 1. The utility model adopts a fitting locking mechanism. After tightening, the heat shrink tube, the heat shrink fitting tube, the heat shrink sleeve and the wrapped heat shrink tube are heated with a lighter. The wrapped heat shrink tube and the heat shrink sleeve can realize the shrinkage operation in the thread gap of the outer wall of the screw. The heat shrink tube, the heat shrink fitting tube, the heat shrink sleeve and the wrapped heat shrink tube can fit tightly on the outer wall of the screw, firmly realize the heating automatic locking operation, and the locking between the screw and the nut is more firm;

[0014] 2. The utility model uses a protective diversion component. When the nut rotates, it will drive multiple connecting rods to move upward. The connecting rods carry the limit rings to move upward. The limit support rings drive the diversion limit rings to move upward. The limit rings carry the wrapping sleeve to be squeezed on the upper surface of the object. When external rainwater contacts the object and flows down, it will quickly and tiltly divert along the outer wall of the wrapping sleeve, and the waterproof and diversion effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the self-locking screw fastener of the utility model.

[0016] Figure 2 It is a schematic diagram of a partial structure of the connection between the nut and the support ring of the utility model.

[0017] Figure 3 The utility model is a schematic diagram of the structure of the self-locking screw fastener when viewed from above.

[0018] Figure 4 It is a schematic diagram of the vertical cross-section structure of the self-locking screw fastener of the utility model.

[0019] Figure 5 It is a schematic diagram of a partial structure of a vertical section of the connection between the nut and the screw rod of the utility model.

[0020] The accompanying drawings are marked as follows: 1. screw; 2. nut; 3. support ring; 4. pillar; 5. heat shrink tube; 6. heat shrink fitting tube; 7. heat shrink sleeve; 8. reinforcement ring; 9. reinforcement rod; 10. wrapped heat shrink tube; 11. rotating cap; 12. connecting rod; 13. limiting ring; 14. guide limiting ring; 15. limiting support ring; 16. wrapping sleeve. DETAILED DESCRIPTION

[0021] 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.

[0022] As attached Figure 1-5 The self-locking screw fastener shown in the figure is provided with a fitting locking mechanism. The setting of the fitting locking mechanism enables the heat shrink tube 5 and the heat shrink fitting tube 6 as well as the heat shrink sleeve 7 and the wrapped heat shrink tube 10 to fit tightly on the outer wall of the screw 1, firmly realizing the automatic locking operation by heating. The specific structural setting of the fitting locking mechanism is as follows.

[0023] In this embodiment, as shown in the attached Figure 1-4As shown, the nut 2 is threadedly connected to the outer wall of the screw 1, the support ring 3 is fixed to the bottom end of the nut 2, and the bottom end of the support ring 3 is provided with a fitting locking mechanism; the fitting locking mechanism includes a plurality of pillars 4 fixedly arranged at the bottom end of the support ring 3, a heat shrink tube 5 fixedly connected to the support ring 3 is provided in the gap surrounded by the plurality of pillars 4, and the bottom end of the heat shrink tube 5 is fixedly connected with a heat shrink fitting tube 6; a heat shrink sleeve 7 is fixedly installed at the bottom end of the heat shrink fitting tube 6, and a reinforcement ring 8 is fixedly connected to the outer wall of the heat shrink sleeve 7, a plurality of reinforcement rods 9 are fixedly installed on the upper surface of the reinforcement ring 8, and a wrapped heat shrink tube 10 is adhesively fixed to the bottom end of the reinforcement ring 8. The heat shrink tube 5, the heat shrink fitting tube 6 and the heat shrink sleeve 7 are all slidably connected to the outside of the screw 1, and the inner wall of the wrapped heat shrink tube 10 is slidably connected to the outside of the screw 1. The heat shrinkable tube 5 and the heat shrinkable adhesive tube 6 are both made of polyethylene material, and the heat shrinkable sleeve 7 and the wrapped heat shrinkable tube 10 are both made of polyethylene material.

[0024] In this embodiment, as shown in the attached Figure 1 As shown, a rotating cap 11 is fixedly installed on the top of the screw rod 1. The cross-section of the rotating cap 11 is polygonal, so that the rotating cap 11 can be easily rotated. The rotating cap 11 can carry the screw rod 1 to rotate, thereby realizing a firm self-locking operation between the screw rod 1 and the nut 2 through the thread.

[0025] When the self-locking screw fastener of this embodiment is used, the screw 1 is inserted into the device, and the nut 2 is rotated so that the nut 2 can be threadedly connected and extruded on the outer wall of the screw 1. At the same time, the rotating cap 11 is rotated, and the rotating cap 11 will carry the screw 1 to rotate, and the screw 1 and the nut 2 are meshed and rotated to realize the tightening operation. After tightening, the heat shrink tube 5 and the heat shrinkable adhesive tube 6 as well as the heat shrinkable sleeve 7 and the wrapped heat shrinkable tube 10 are heated with a lighter, and the heat shrinkable tube 5 and the heat shrinkable adhesive tube 6 will shrink in the thread gap of the outer wall of the screw 1, and the wrapped heat shrinkable tube 1 0 and the heat shrinkable tube 7 can realize the shrinking operation in the thread gap of the outer wall of the screw 1, and the nut 2 supports the support ring 3, the support ring 3 supports multiple pillars 4, the pillars 4 support the heat shrinkable fitting tube 6, the heat shrinkable fitting tube 6 supports multiple reinforcement rods 9, the reinforcement rods 9 support the reinforcement ring 8, and the reinforcement ring 8 provides support force for the outer wall of the heat shrinkable tube 7, so that the heat shrinkable tube 5 and the heat shrinkable fitting tube 6 as well as the heat shrinkable tube 7 and the wrapped heat shrinkable tube 10 can fit tightly on the outer wall of the screw 1 to prevent the nut 2 from moving down, and firmly realize stable self-locking operation on the nut 2.

[0026] In this embodiment, as shown in the attached Figure 4-5As shown, a protective flow guide assembly is installed on the upper surface of the nut 2; the protective flow guide assembly includes a plurality of connecting rods 12 installed on the upper surface of the nut 2, the top of the connecting rod 12 is fixedly connected to a limit ring 13, the bottom end of the limit ring 13 and close to its inner wall is fixedly connected to a flow guide limit ring 14, and a limit support ring 15 is fixedly connected between the flow guide limit ring 14 and the nut 2; a wrapping sleeve 16 is bonded and fixed to the upper surface of the limit ring 13. The inner walls of the flow guide limit ring 14 and the limit support ring 15 are both smooth surfaces, and the flow guide limit ring 14 and the limit support ring 15 are both made of stainless steel. A circular gap is provided between the wrapping sleeve 16 and the screw 1, and the inner wall diameter of the top end of the wrapping sleeve 16 is larger than the inner wall diameter of the bottom end.

[0027] When this embodiment is in use, the nut 2 rotates to drive multiple connecting rods 12 to move upward, and the connecting rod 12 carries the limiting ring 13 to move upward. At the same time, the nut 2 drives the limiting support ring 15 to move upward, and the limiting support ring 15 drives the diversion limiting ring 14 to move upward. The limiting ring 13 carries the wrapping sleeve 16. The wrapping sleeve 16 is squeezed on the upper surface of the object. When external rainwater contacts the object and flows down, it is quickly diverted along the outer wall of the wrapping sleeve 16. This has a better waterproof effect and prevents water from entering the gap between the screw 1 and the nut 2.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-locking screw fastener, comprising a screw rod (1), a nut (2) and a support ring (3), wherein the nut (2) is threadedly connected to the outer wall of the screw rod (1), and the support ring (3) is fixed to the bottom end of the nut (2), characterized in that: The bottom end of the support ring (3) is provided with a fitting locking mechanism; The fitting and locking mechanism comprises a plurality of pillars (4) fixedly arranged at the bottom end of the support ring (3); a heat shrink tube (5) fixedly connected to the support ring (3) is arranged in a gap surrounded by the plurality of pillars (4); and a heat shrink fitting tube (6) is fixedly connected to the bottom end of the heat shrink tube (5); A heat shrink sleeve (7) is fixedly mounted on the bottom end of the heat shrink fitting tube (6), and a reinforcement ring (8) is fixedly connected to the outer wall of the heat shrink sleeve (7), a plurality of reinforcement rods (9) are fixedly mounted on the upper surface of the reinforcement ring (8), and a wrapped heat shrink tube (10) is adhesively fixed to the bottom end of the reinforcement ring (8).

2. The self-locking screw fastener according to claim 1, characterized in that: The heat shrink tube (5), the heat shrink fitting tube (6) and the heat shrink sleeve (7) are all slidably connected to the outside of the screw (1), and the inner wall of the wrapped heat shrink tube (10) is slidably connected to the outside of the screw (1).

3. The self-locking screw fastener according to claim 1, characterized in that: The heat shrinkable tube (5) and the heat shrinkable bonding tube (6) are both made of polyethylene material, and the heat shrinkable sleeve (7) and the wrapped heat shrinkable tube (10) are both made of polyethylene material.

4. The self-locking screw fastener according to claim 1, characterized in that: A rotating cap (11) is fixedly mounted on the top end of the screw rod (1), and the rotating cap (11) has a polygonal cross-sectional shape.

5. The self-locking screw fastener according to claim 1, characterized in that: A protective flow guide component is installed on the upper surface of the nut (2); The protective flow guide assembly comprises a plurality of connecting rods (12) mounted on the upper surface of the nut (2), the top end of the connecting rod (12) being fixedly connected to a limit ring (13), the bottom end of the limit ring (13) being fixedly connected to a flow guide limit ring (14) near the inner wall thereof, and a limit support ring (15) being fixedly connected between the flow guide limit ring (14) and the nut (2); A wrapping sleeve (16) is bonded and fixed to the upper surface of the limiting ring (13).

6. The self-locking screw fastener according to claim 5, characterized in that: The inner walls of the flow guide limiting ring (14) and the limiting support ring (15) are both smooth surfaces, and the flow guide limiting ring (14) and the limiting support ring (15) are both made of stainless steel.

7. The self-locking screw fastener according to claim 5, characterized in that: An annular gap is provided between the wrapping sleeve (16) and the screw (1), and the inner wall diameter at the top end of the wrapping sleeve (16) is greater than the inner wall diameter at the bottom end thereof.

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