Anti-thread-slipping double-end bolt

Abstract

The utility model belongs to the technical field of mechanical fasteners, and particularly relates to an anti-thread-slipping double-end bolt. The anti-thread-slipping double-end bolt comprises a polished rod, threaded sections are fixedly connected to the two ends of the polished rod correspondingly, positioning assemblies used for conducting auxiliary positioning when the bolt is installed are installed on the outer sides of the two threaded sections correspondingly, each positioning assembly comprises a contact boss, and the contact bosses are arranged on the outer sides of the ends, away from the polished rod, of the threaded sections; the top of the contact boss is provided with a moving assembly used for preventing the positioning assembly from being stuck in the bolt connecting process, the positioning assembly further comprises an external connection block, the external connection block is rotationally connected to the upper surface of the polished rod, accurate contact between a stud and a nut can be achieved through the positioning assembly, it is ensured that stress is uniform during threaded connection, and the service life of the stud is prolonged. And meanwhile, the positioning assembly and the moving assembly work cooperatively, so that the dynamic matching precision is ensured, the blocking problem caused by mechanical interference is avoided, and the reliability and durability of bolt connection are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical fastener technology, specifically to an anti-slip double-ended bolt. Background Technology

[0002] Double-ended studs, also known as double-ended bolts or double-ended screws, are used for fixing and connecting machinery. Double-ended studs have threads on both ends and a threaded rod in the middle, which can be thick or thin. They are generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, cranes, large-span steel structures, and large buildings.

[0003] Chinese Patent Publication No. CN221990746U discloses an anti-slip double-ended bolt. This design includes a top screw and a bottom screw, connected by a locking mechanism. The locking mechanism includes a groove, a connecting rod, a fixing ring, several spring plates, several spring collets, a locking sleeve, and an anti-loosening mechanism. The anti-loosening mechanism includes several fixing holes, an external hexagonal head, several sets of fixing grooves, and a cotter pin. The advantages of this invention are that the connection between the top and bottom screws via the locking mechanism is a detachable structure, allowing users to adjust the length of the double-ended bolt according to installation requirements. The locking mechanism, using a locking sleeve and several spring collets, can quickly lock the connecting rod at the upper end of the bottom screw, facilitating installation. The cotter pin in the anti-loosening mechanism prevents the locking sleeve from loosening, thereby improving the stability of the double-ended bolt.

[0004] Although the above-mentioned device can adjust the length of the double-ended bolt through the detachable structure, since double-ended bolts often need to be connected to mechanical structures, connecting the bolts on both sides by disassembling the structure will significantly reduce the stability and load-bearing capacity of the double-ended bolt. Since stripping is mostly caused by tool slippage or uneven thread stress, the cooperation between the locking sleeve and the spring collet alone cannot prevent stripping during the bolt connection process. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-slip threaded double-ended bolt to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an anti-slip threaded double-ended bolt, comprising a smooth rod, both ends of which are fixedly connected to threaded sections, and positioning components for auxiliary positioning during bolt installation are installed on the outer sides of both threaded sections. The positioning components include contact bosses, which are located on the outer side of the threaded section away from the smooth rod, and a moving component for preventing the positioning components from jamming during bolt connection is installed on the top of the contact bosses.

[0007] Preferably, the positioning component further includes an external block, which is rotatably connected to the upper surface of the optical rod. Multiple springs are fixedly connected at equal intervals around the center of the external block on its outer wall, and the top of each spring is fixedly connected to the outer wall of the contact boss.

[0008] Preferably, the moving component includes an annular block, which is rotatably connected to the top of a contact boss. The top wall of the contact boss has an inner groove, and the bottom wall of the annular block has three equidistant limiting grooves. The dimensions of the inner groove and the limiting grooves are matched. A connecting rod is fixedly connected to the inner edge of each limiting groove, and a pulley group is rotatably connected to the outer wall of the connecting rod.

[0009] Preferably, the outer wall of the threaded section is provided with coarse threads and fine threads respectively from the smooth rod outward.

[0010] Preferably, the top of the outer wall of the threaded section is provided with multiple anti-slip grooves at equal intervals.

[0011] Preferably, the outer wall of the threaded section is fixedly connected with a plurality of first protrusions at equal intervals, the installation positions of the first protrusions are staggered from the anti-slip grooves, and the outer walls of the first protrusions are fixedly connected with second protrusions on both sides.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the anti-slip double-ended bolt achieves precise contact between the double-ended bolt and the nut through the positioning component, ensuring uniform force on the threaded connection, thereby improving connection stability and effectively preventing slippage. At the same time, the positioning component and the moving component work together to ensure dynamic fit accuracy, avoid jamming caused by mechanical interference, and ensure the reliability and durability of the bolt connection. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a partial structural diagram of an anti-slip threaded double-ended bolt proposed in this utility model;

[0015] Figure 3 for Figure 3 Enlarged structural diagram at point A in the diagram;

[0016] Figure 4 This is a partially disassembled structural diagram of an anti-slip threaded double-ended bolt proposed in this utility model;

[0017] Figure 5 This is a schematic diagram of the annular block structure proposed in this utility model from a bottom view.

[0018] In the diagram: 1. Smooth rod; 2. Threaded section; 3. External block; 31. Spring; 32. Contact boss; 4. Annular block; 41. Inner groove; 42. Limiting groove; 43. Connecting rod; 44. Pulley block; 5. Fine thread; 6. Coarse thread; 7. First protrusion; 8. Second protrusion; 9. Anti-slip groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 - Figure 5 This utility model provides a technical solution: an anti-slip double-ended bolt, including a smooth rod 1, both ends of which are fixedly connected to threaded sections 2. Positioning components for auxiliary positioning during bolt installation are installed on the outer sides of both threaded sections 2. Each positioning component includes a contact boss 32, located on the outer side of the threaded section 2 away from the smooth rod 1. A moving component is installed on the top of the contact boss 32 to prevent the positioning component from jamming during bolt connection. The positioning component also includes an outer block 3, rotatably connected to the upper surface of the smooth rod 1. Multiple springs 31 are fixedly connected at equal intervals around the center of the outer block 3 on its outer wall. The top ends of the springs 31 are fixedly connected to the outer wall of the contact boss 32.

[0021] Through the above technical solution, the main body of the double-ended bolt consists of an integrally welded smooth rod 1 and threaded sections 2 on both sides. The end of the threaded section 2 near the smooth rod 1 retains a smooth outer wall. The height of the outer block 3 is slightly lower than the smooth outer wall, while the diameter is slightly larger than the threaded section 2. The outer block 3 is connected to the contact boss 32 through three springs 31, so that the contact boss 32 and the annular block 4 contact the connected parts during the connection process of the bolt and the connected parts, so as to achieve uniform force during bolt installation and avoid uneven force leading to stripping.

[0022] Please see Figure 2 , Figure 4 and Figure 5 The moving component includes an annular block 4, which is rotatably connected to the top of the contact boss 32. The top wall of the contact boss 32 is provided with an inner groove 41, and the bottom wall of the annular block 4 is provided with three equidistant limiting grooves 42. The dimensions of the inner groove 41 and the limiting grooves 42 are matched. A connecting rod 43 is fixedly connected to the inner edge of the limiting groove 42. A pulley group 44 is rotatably connected to the outer wall of the connecting rod 43. The outer wall of the threaded section 2 is provided with coarse threads 5 and fine threads 6 respectively from the smooth rod 1 outward.

[0023] Through the above technical solution, the annular block 4 and the contact boss 32 are first fixed by the positioning structure, and then the fixed rotation effect is achieved by the moving component. The annular block 4 is in direct contact with the connected part. When subjected to the twisting force from the connected part, the design of the pulley block 44 can control the annular block 4 to slide in the inner groove 41 of the top wall of the contact boss 32, thereby achieving the fixed rotation effect. The moving component can convert the tightening force generated during bolt installation into rotational force, avoiding the positioning component from getting stuck. The coarse thread 6 increases the initial screwing speed, and the fine thread 5 enhances the locking force and reduces the risk of stripping.

[0024] Please see Figure 1 , Figure 2 and Figure 3 Multiple anti-slip grooves 9 are provided at equal intervals on the top of the outer wall of the threaded section 2; multiple first protrusions 7 are fixedly connected at equal intervals on the outer wall of the threaded section 2, the installation positions of the first protrusions 7 are staggered from the anti-slip grooves 9, and second protrusions 8 are fixedly connected on both sides of the outer wall of the first protrusions 7.

[0025] Through the above technical solution, the tail of the threaded section 2 is machined with an axial anti-slip groove 9, which can be inserted into the groove during disassembly to avoid slippage; the first protrusion 7 has an angle in the vertical direction, and the second protrusion 7 has angles at both ends in the horizontal direction. The design facilitates the insertion and installation with the connected parts, improves the stability of the installation process, and reduces the probability of stripping.

[0026] Working distance: Threaded sections 2 are integrally welded to both the upper and lower ends of the guide rod 1. The outer wall of the threaded section 2 has fine threads 5 and coarse threads 6 respectively, extending from the end closest to the guide rod 1 outwards. The coarse thread 6 increases the initial screwing speed. Simultaneously, a first protrusion 7 is fixedly connected to the edge of the outer wall of the threaded section 2. The first protrusion 7 has an angled edge near the tail of the threaded section 2. When the threaded section 2 is first screwed in, the coarse thread 6 and the first protrusion 8 work together to ensure the stability of the double-ended bolt connection. The fine thread 5 enhances the locking force and reduces the risk of stripping. A pitch gradient transition zone is set at the connection between the fine thread 5 and the coarse thread 6 to ensure the smooth transition of the gradient thread connection. The annular block 4 is connected to the contact boss 32 through a limiting structure, ensuring that the annular block 4 and the contact boss 32 are movable. During the double-ended bolt connection, the annular block 4 can abut against the connected parts to ensure uniform force distribution, while the contact boss 32 provides support for the annular block 4. It is also connected to the outer block 3 through a spring 31. When bolts are installed with nuts or threaded rings, the connected parts gradually apply downward pressure to the contact boss 32, causing the spring 31 to continuously compress until the bolt installation is complete. Since the bolt is being tightened during installation, the connected parts also provide horizontal tightening force to the contact boss 32 and the annular block 4. This makes the spring 31 susceptible to twisting due to the tightening force, causing the positioning assembly to jam. When the annular block 4 is subjected to the tightening force from the connected parts, it drives multiple pulley sets 44 to move through the inner wall of the limiting groove 42. The pulley sets 44 enable the sliding between the annular block 4 and the contact boss 32, thereby converting the tightening force into a driving force controlling the horizontal direction of the annular block 4 and a downward pressure on the spring 31, ensuring the normal operation of the positioning assembly. During the tightening of the double-ended bolt, the second protrusion 8 ensures that the bolt can be stably embedded in the connected parts, achieving a stable connection between the bolt and the connected parts, ensuring uniform force distribution, and preventing stripping.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the scope and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-galling stud bolt comprising a smooth shank (1) characterized in that: Both ends of the polished rod (1) are fixedly connected with threaded segments (2), the outer sides of the two threaded segments (2) are both provided with positioning assemblies for assisting positioning during bolt mounting, the positioning assembly comprises a contact boss (32), the contact boss (32) is arranged on the outer side of the threaded segment (2) away from the polished rod (1), and the top of the contact boss (32) is provided with a moving assembly for avoiding the positioning assembly from being stuck during bolt connection.

2. A non-slip double end bolt according to claim 1, wherein: The positioning assembly further comprises an outer connecting block (3), the outer connecting block (3) is rotationally connected to the upper surface of the polished rod (1), a plurality of springs (31) are fixedly connected to the outer wall of the outer connecting block (3) at equal distances with the center of the outer connecting block (3) as an axis, and the top end of the spring (31) is fixedly connected to the outer wall of the contact boss (32).

3. A non-slip double end bolt according to claim 2, wherein: The moving assembly comprises an annular block (4), the annular block (4) is rotationally connected to the top of the contact boss (32), the top wall of the contact boss (32) is provided with an inner groove (41), three limiting grooves (42) are equidistantly arranged on the bottom wall of the annular block (4), the sizes of the inner groove (41) and the limiting groove (42) are matched, the inner wall edges of the limiting grooves (42) are all fixedly connected with connecting rods (43), and the outer wall of the connecting rod (43) is rotationally connected with a pulley block (44).

4. The anti-galling stud of claim 1, wherein: The outer wall of the threaded segment (2) is respectively provided with a coarse thread (5) and a fine thread (6) outward from the polished rod (1).

5. The anti-galling stud of claim 1, wherein: The outer wall top of the threaded segment (2) is equidistantly provided with a plurality of anti-skid grooves (9).

6. A non-slip double end bolt according to claim 5, wherein: The outer wall of the threaded segment (2) is equidistantly fixedly connected with a plurality of first protrusions (7), the mounting positions of the first protrusions (7) and the anti-skid grooves (9) are staggered, and the outer wall sides of the first protrusions (7) are both fixedly connected with second protrusions (8).

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