Anti-thread-slipping expansion bolt

Abstract

The utility model discloses an anti-thread-slipping expansion bolt which comprises an expansion sleeve and a countersunk bolt, a plurality of openings are formed in the tail of the expansion sleeve, a reinforcing sleeve is installed on the inner wall of the expansion sleeve and located above the openings, guide sliding rods are installed on the periphery of the bottom of the reinforcing sleeve, the countersunk bolt is connected with a limiting circular ring, and the limiting circular ring is connected with the countersunk bolt. Guide through holes are formed in the periphery of the limiting circular ring, the limiting circular ring is in sliding connection with the guide sliding rods through the guide through holes, a screw is arranged in the reinforcing sleeve, the top end of the screw extends out of the expansion sleeve, a fixing bearing is installed at the top end of the countersunk bolt, and a fixing rod is installed at the bottom end of the screw. The end, away from the screw, of the fixing rod is connected with the fixing bearing, and the screw is in threaded connection with a nut. The expansion sleeve has the beneficial effects that the phenomenon of thread slipping caused by overlarge torsion is avoided, the service life is prolonged, the strength of the expansion sleeve is increased, the countersunk bolt and the screw rod are prevented from shaking, and the expansion sleeve is prevented from loosening caused by shaking.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion bolts, in particular to an expansion bolt with anti-slip threads. Background Art

[0002] An expansion bolt is composed of a countersunk head bolt, an expansion tube, a flat washer, a spring washer and a hexagon nut. When in use, a hole with a corresponding size is drilled in a fixed body with an impact electric drill, and then the bolt and the expansion tube are inserted into the hole, and the nut is tightened to make the bolt, the expansion tube, the installation part and the fixed body expand and tighten into one body.

[0003] The utility model with the application number CN202223264938.3 discloses an expansion bolt with anti-slip threads. By setting an active pressing component, when disassembling the expansion bolt main body, only need to rotate the built-in bolt counterclockwise, and then the expansion bolt main body can be taken out from the inside of the hole. Through the setting of the active pressing component, it replaces the existing fixing method of forcing the tube to deform with a large head, and can effectively relieve the pressure between the threads, prevent the problem of thread slipping, and greatly improve the practicability of the expansion bolt main body.

[0004] The above device drives the threaded sleeve to move downward by rotating the built-in bolt, and the threaded sleeve makes the movable clamping plate move outward and fit tightly with the inner wall of the hole. After the movable clamping plate fits with the inner wall of the hole, the threaded sleeve cannot move downward anymore. If the bolt is screwed at this time, it is easy to cause the bolt and the threaded sleeve to slip threads, reducing the service life, and it is not easy to disassemble after thread slipping. The built-in bolt is in direct contact with the expansion bolt main body, and the expansion bolt main body is easy to be damaged when the torque is too large.

[0005] It should be noted that the above content belongs to the technical cognition scope of the inventor and does not necessarily constitute the prior art. Content of the Utility Model

[0006] The purpose of the utility model is to solve the above problems and design an expansion bolt with anti-slip threads.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An expansion bolt with anti-slip threads, comprising an expansion sleeve and a countersunk head bolt. The countersunk head bolt is located at the tail of the expansion sleeve. The tail of the expansion sleeve is provided with multiple openings. A reinforcing sleeve is installed on the inner wall of the expansion sleeve. The reinforcing sleeve is located above the openings. Guide sliding rods are installed around the bottom of the reinforcing sleeve. A limiting ring is connected to the countersunk head bolt. Guide through holes are provided around the limiting ring. The limiting ring is slidably connected to the guide sliding rods through the guide through holes. A screw rod is provided inside the reinforcing sleeve. The top end of the screw rod extends out of the expansion sleeve. A fixed bearing is installed at the top end of the countersunk head bolt. A fixed rod is installed at the bottom end of the screw rod. One end of the fixed rod away from the screw rod is connected to the fixed bearing. A nut is threadedly connected to the screw rod.

[0009] Further, a fixed ring is installed on the screw rod. The fixed ring is located above the reinforcing sleeve. A telescopic spring is sleeved on the screw rod. The bottom end of the telescopic spring is connected to the fixed ring. A flat washer is provided between the upper end of the telescopic spring and the nut.

[0010] Further, serrated bumps are provided around the tail of the expansion sleeve. The serrated bumps are located between adjacent openings.

[0011] Further, the outer diameters of the fixed ring and the limiting ring are the same as the inner diameter of the expansion sleeve. The inner ring of the fixed ring is fixedly connected to the screw rod. The inner ring of the limiting ring is fixedly connected to the countersunk head bolt. The inner diameter of the reinforcing sleeve is the same as the diameter of the countersunk head bolt.

[0012] Further, the outer ring of the fixed bearing is fixedly connected to the countersunk head bolt. The inner ring of the fixed bearing is fixedly connected to the fixed rod.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] The screw rod drives the countersunk head bolt to move upward through the fixed rod and the fixed bearing. The bottom of the countersunk head bolt presses the expansion sleeve, so that multiple openings at the tail of the expansion sleeve are opened. The expansion sleeve expands and fits tightly with the inner wall of the hole. When the countersunk head bolt moves upward, it drives the limiting ring to move upward. After the limiting ring rises and contacts the reinforcing sleeve, it limits the countersunk head bolt to prevent the expansion sleeve from over-expanding and damaging the hole.

[0015] After the countersunk head bolt and the limiting ring are in place, then rotate the nut. The nut will drive the screw rod and the fixed rod to rotate along the fixed bearing, avoiding the phenomenon of thread slipping caused by excessive torque, improving the service life. The strength of the expansion sleeve is increased through the reinforcing sleeve, preventing the expansion sleeve from bending and deforming, and increasing the service life.

[0016] When turning the nut to drive the screw rod to move upward, the screw rod drives the fixed ring to rise. The fixed ring exerts pressure on the telescopic spring. The nut does not directly exert force on the expansion sleeve. The telescopic spring plays a buffering role to prevent the expansion sleeve from expanding excessively and damaging the reserved hole.

[0017] When the countersunk bolt and the screw rod move upward along the expansion sleeve, the fixed ring and the limit ring slide along the inner wall of the expansion sleeve, avoiding the shaking of the countersunk bolt and the screw rod and preventing the expansion sleeve from loosening due to shaking. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of an anti-slip thread expansion bolt described in the present invention.

[0019] Figure 2 It is a schematic cross-sectional view of the expansion sleeve.

[0020] Figure 3 It is Figure 2 The partial enlarged view at A in

[0021] Figure 4 It is an enlarged cross-sectional view of the countersunk bolt.

[0022] Figure 5 It is an enlarged top view of the countersunk bolt.

[0023] In the figure: 1. Expansion sleeve; 2. Countersunk bolt; 3. Opening; 4. Reinforcing sleeve; 5. Guide slide bar; 6. Limit ring; 7. Guide through hole; 8. Screw rod; 9. Fixed bearing; 10. Fixed rod; 11. Nut; 12. Fixed ring; 13. Telescopic spring; 14. Flat washer; 15. Serrated convex block. Detailed Description of the Invention

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0026] The present utility model provides an expansion bolt with anti-slip threads as shown in Figures 1-5 which includes an expansion sleeve 1 and a countersunk head bolt 2. The countersunk head bolt 2 is located at the tail of the expansion sleeve 1. The tail of the expansion sleeve 1 is provided with a plurality of openings 3. A reinforcing sleeve 4 is installed on the inner wall of the expansion sleeve 1. The reinforcing sleeve 4 is located above the openings 3. Four circumferences at the bottom of the reinforcing sleeve 4 are installed with guiding slide bars 5. A limiting ring 6 is connected to the countersunk head bolt 2. Guiding through holes 7 are provided around the limiting ring 6. The limiting ring 6 is slidably connected to the guiding slide bars 5 through the guiding through holes 7. A screw rod 8 is provided inside the reinforcing sleeve 4. The top end of the screw rod 8 extends out of the expansion sleeve 1. A fixed bearing 9 is installed at the top end of the countersunk head bolt 2. A fixed rod 10 is installed at the bottom end of the screw rod 8. One end of the fixed rod 10 far from the screw rod 8 is connected to the fixed bearing 9. A nut 11 is threadedly connected to the screw rod 8.

[0027] After inserting the expansion sleeve 1 into the drilled hole, turn the nut 11. The nut 11 drives the screw rod 8 to move upward. The screw rod 8 drives the countersunk head bolt 2 to move upward through the fixed rod 10 and the fixed bearing 9. The bottom of the countersunk head bolt 2 presses the expansion sleeve 1, so that the plurality of openings 3 at the tail of the expansion sleeve 1 are expanded. The expansion sleeve 1 expands and fits tightly with the inner wall of the hole. When the countersunk head bolt 2 moves upward, it drives the limiting ring 6 to move upward. The limiting ring 6 plays a guiding role for the countersunk head bolt 2 through the guiding through holes 7 and the guiding slide bars 5, avoiding the rotation of the countersunk head bolt 2. The rotation of the screw rod 8 is not hindered by the fixed rod 10 and the fixed bearing 9. After the limiting ring 6 rises and contacts the reinforcing sleeve 4, the countersunk head bolt 2 is limited, avoiding damage to the hole caused by excessive expansion of the expansion sleeve 1. After the countersunk head bolt 2 and the limiting ring 6 are in place, rotate the nut 11 again. The nut 11 will drive the screw rod 8 and the fixed rod 10 to rotate along the fixed bearing 9, avoiding the phenomenon of thread slipping caused by excessive torque and improving the service life. The strength of the expansion sleeve 1 is increased through the reinforcing sleeve 4, avoiding bending and deformation of the expansion sleeve 1 and increasing the service life.

[0028] Refer to the attached Figure 1 and the attached Figure 2 and the attached Figure 3, a fixed ring 12 is installed on the screw rod 8. The fixed ring 12 is located above the reinforcing sleeve 4. A telescopic spring 13 is sleeved on the screw rod 8. The bottom end of the telescopic spring 13 is connected to the fixed ring 12. A flat washer 14 is provided between the upper end of the telescopic spring 13 and the nut 11.

[0029] The mounting part to be fixed is installed between the flat washer 14 and the nut 11. When the nut 11 is turned to drive the screw rod 8 to move upward, the screw rod 8 drives the fixed ring 12 to rise. The fixed ring 12 applies pressure to the telescopic spring 13, and the nut 11 does not directly apply force to the expansion sleeve 1. The telescopic spring 13 plays a buffering role to prevent the expansion sleeve 1 from being over-expanded and causing damage to the reserved hole.

[0030] Refer to the attached Figure 1 and the attached Figure 2 , serrated bumps 15 are provided around the tail of the expansion sleeve 1. The serrated bumps 15 are located between adjacent openings 3.

[0031] After the tail of the expansion sleeve 1 is expanded, the serrated bumps 15 are in contact with the inner wall of the hole, increasing the friction force, preventing the expansion sleeve 1 from rotating, and preventing the expansion sleeve 1 from loosening.

[0032] Refer to the attached Figure 2 、the attached Figure 3 and the attached Figure 4 , the outer diameters of the fixed ring 12 and the limit ring 6 are the same as the inner diameter of the expansion sleeve 1. The inner ring of the fixed ring 12 is fixedly connected to the screw rod 8. The inner ring of the limit ring 6 is fixedly connected to the countersunk head bolt 2. The inner diameter of the reinforcing sleeve 4 is the same as the diameter of the countersunk head bolt 2.

[0033] When the countersunk head bolt 2 and the screw rod 8 move upward along the expansion sleeve 1, the fixed ring 12 and the limit ring 6 slide along the inner wall of the expansion sleeve 1, avoiding the shaking of the countersunk head bolt 2 and the screw rod 8 and preventing the loosening of the expansion sleeve 1 caused by the shaking.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An expansion bolt with anti-slip threads, comprising an expansion sleeve (1) and a countersunk head bolt (2), the countersunk head bolt (2) being located at the tail of the expansion sleeve (1), and multiple openings (3) being provided at the tail of the expansion sleeve (1), characterized in that, A reinforcing sleeve (4) is installed on the inner wall of the expandable casing (1). The reinforcing sleeve (4) is located above the opening (3). Guide slide rods (5) are installed around the bottom of the reinforcing sleeve (4). A limit ring (6) is connected to the countersunk head bolt (2). Guide through holes (7) are provided around the limit ring (6). The limit ring (6) is slidably connected to the guide slide rods (5) through the guide through holes (7). A screw rod (8) is provided inside the reinforcing sleeve (4). The top end of the screw rod (8) extends out of the expandable casing (1). A fixed bearing (9) is installed at the top end of the countersunk head bolt (2). A fixed rod (10) is installed at the bottom end of the screw rod (8). One end of the fixed rod (10) away from the screw rod (8) is connected to the fixed bearing (9). A nut (11) is threadedly connected to the screw rod (8).

2. An expansion bolt with anti-slip threads according to claim 1, characterized in that, A fixed ring (12) is installed on the screw rod (8). The fixed ring (12) is located above the reinforcing sleeve (4). A telescopic spring (13) is sleeved on the screw rod (8). The bottom end of the telescopic spring (13) is connected to the fixed ring (12). A flat washer (14) is provided between the upper end of the telescopic spring (13) and the nut (11).

3. The expansion bolt with anti-slip wire according to claim 1, characterized in that, Jagged bumps (15) are provided around the tail of the expandable casing (1). The jagged bumps (15) are located between adjacent openings (3).

4. The expansion bolt with anti-slip wire according to claim 2, characterized in that, The outer diameters of the fixed ring (12) and the limit ring (6) are the same as the inner diameter of the expandable casing (1). The inner ring of the fixed ring (12) is fixedly connected to the screw rod (8). The inner ring of the limit ring (6) is fixedly connected to the countersunk head bolt (2). The inner diameter of the reinforcing sleeve (4) is the same as the diameter of the countersunk head bolt (2).

5. The expansion bolt with anti-slip wire according to claim 1, characterized in that, The outer ring of the fixed bearing (9) is fixedly connected to the countersunk head bolt (2). The inner ring of the fixed bearing (9) is fixedly connected to the fixed rod (10).

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