High-strength anti-abrasion bolt surface strengthening protection structure

Abstract

The utility model discloses a high -strength anti -erosion bolt surface strengthening protection structure belongs to fastener auxiliary equipment technical field. Including protection shell, stud, locking mechanism and spring no. 2. Protection shell is tubular structure, and the stud is contained in it. Locking mechanism sets up at the open end of protection shell, is by the groove that distributes along the circumference, is through the jaw that rotates and is connected in the groove of pivot and is connected in the spring between the jaw and protection shell and is composed. Spring no. 1 provides pre -tightening force drive jaw contraction, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2 sets up at the bottom end of protection shell, and the head of clamping stud, spring no. 2

Description

Technical Field

[0001] This utility model relates to the field of fastener auxiliary equipment technology, and in particular to a high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure. Background Technology

[0002] High-strength, wear-resistant, and corrosion-resistant bolts are widely used in harsh environments such as heavy machinery, chemical equipment, and marine engineering, where extremely high connection strength and corrosion resistance are required. These bolts typically undergo precise surface heat treatment and special anti-corrosion coating processes; the integrity of their surface directly determines their service life and safety performance in harsh environments. Therefore, effective protection is crucial during the storage, logistics, and on-site preparation stages of these bolts after production.

[0003] Current conventional protective measures often involve simply wrapping the threaded portion with a plastic mesh sleeve or directly stacking them in a container. However, this simple protective method has significant drawbacks: firstly, simply wrapping the threads cannot protect the bolt head and shank surface. During transport, the bolts are prone to colliding with each other or rubbing against the container wall, leading to the peeling off of the expensive anti-corrosion coating or stress-concentrated scratches; secondly, existing tubular protective sleeves typically rely solely on the interference fit (friction) between the inner wall and the bolt for fixation, a passive method with poor reliability.

[0004] Specifically, with increased usage or changes in ambient temperature, the plastic deformation of the protective sleeve leads to a decrease in clamping force. When subjected to continuous vibration during transport, the heavy, high-strength bolts can easily slip out of the sleeve, losing their protective function. Conversely, if the fit tolerance is designed to be too tight to prevent slippage, it makes bolt removal extremely difficult, especially when the bolt is completely submerged within the sleeve for comprehensive protection. Operators often struggle to pull it out, severely impacting on-site assembly efficiency. In summary, existing technologies lack a device that provides comprehensive physical isolation protection while also ensuring reliable transport locking and ease of retrieval. Therefore, a high-strength, wear-resistant, corrosion-resistant bolt surface-reinforced protective structure is proposed to address these issues. Utility Model Content

[0005] In view of the problems in the existing high-strength wear-resistant and corrosion-resistant bolt surface strengthening and protection structure, such as unreliable fixing of the protective sleeve, easy loosening during transportation vibration, and difficulty in quickly removing the bolt after it is completely sunk into the sleeve, this utility model aims to provide a high-strength wear-resistant and corrosion-resistant bolt surface strengthening and protection structure with improved structure that can effectively solve the above problems.

[0006] This utility model provides a high-strength wear-resistant and corrosion-resistant bolt surface strengthening and protection structure, including: a protective shell, a stud, a locking mechanism, and a second spring.

[0007] The protective shell is a hollow tubular structure used to completely house the stud within the cavity. The second spring is located at the bottom of the inner part of the protective shell. The end of the stud abuts against and compresses the second spring, using the preload generated by the second spring to eliminate the axial movement gap of the stud and provide a buffering and ejection function.

[0008] The locking mechanism is located at the opening end of the protective shell. The locking mechanism is the core innovative component of this utility model, and it includes a groove, a gripper, a rotating shaft, and a spring.

[0009] The groove is evenly opened circumferentially along the opening end of the protective shell. The gripper is set in the groove. The rotating shaft passes through the middle of the gripper and is fixedly connected to the inner wall of the groove. The gripper is rotatably connected to the protective shell through the rotating shaft, forming a lever structure that can swing around the rotating shaft.

[0010] Furthermore, spring one is connected between the gripper and the protective shell. Spring one is an external tension spring, which is arranged on the outside of the protective shell. Spring one provides a continuous preload force to drive the gripper to rotate around the pivot, so that the bottom end of the gripper retracts towards the central axis of the protective shell, thereby cooperating with the axial force of spring two to firmly fix the head of the stud in the inner cavity of the protective shell, achieving a double stable locking in both axial and radial directions.

[0011] Preferably, the first spring is a tension helical spring. The first spring is in a stretched state, with one end of the first spring fixedly connected to the force-applying end of the clamp located outside the protective shell, and the other end of the first spring fixedly connected to the outer wall of the protective shell, so as to provide a continuous and stable locking force by utilizing the mechanical properties of the tension spring.

[0012] Preferably, the gripper includes a force-applying end located above the rotating shaft and a holding end located below the rotating shaft. The inner side of the holding end is provided with a groove that matches the shape of the stud head. The gripper engages with the stud head through the groove to ensure the stability of the gripping and the accuracy of the alignment.

[0013] Preferably, the grooves are evenly distributed circumferentially along the opening end of the protective shell, and the number of the grippers is the same as the number of grooves. Multiple grippers are arranged circumferentially to form a multi-point uniform circumferential clamping of the stud head, effectively dispersing the clamping stress and avoiding local damage.

[0014] Preferably, the axis of the rotating shaft is perpendicular to the central axis of the protective shell, and the plane in which the gripper rotates around the rotating shaft passes through the central axis of the protective shell. This arrangement ensures that the rotation of the gripper can effectively change the radial dimension at the opening of the protective shell.

[0015] Preferably, the second spring is a cylindrical helical compression spring. The bottom of the second spring is fixedly connected to the inner bottom wall of the protective shell, and the top of the second spring is provided with a washer for supporting the end of the stud. The washer is made of wear-resistant material to avoid direct metal-to-metal contact and protect the end of the stud.

[0016] Preferably, the outer wall of the protective shell has a protrusion corresponding to the connection of the spring, and the spring is hooked on the protrusion. The protrusion plays a role in positioning and bearing force, which facilitates the installation and replacement of the spring.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model solves the problem that existing high-strength bolts are easily subjected to collisions, scratches, and corrosion from external hard objects in complex storage and transportation environments by setting a fully enclosed protective shell structure, which completely accommodates the main body of the stud in the inner cavity. It achieves the technical effect of physical isolation protection, maintaining the surface accuracy and coating integrity of the bolt, thereby significantly extending the service life of the product.

[0019] 2. This utility model solves the problem of traditional protective devices being cumbersome to fix and not secure, and prone to loosening or falling off under transportation vibration conditions by using lever-type grippers in combination with external tension springs to form an automatic locking mechanism at the opening of the protective shell. It achieves the technical effect of automatically clamping the bolt head with elastic potential energy without the need for auxiliary tools, realizing multi-point stable clamping, and ensuring safe and reliable transportation process.

[0020] 3. This utility model solves the problems of easy impact damage to the bottom when the bolt is inserted and difficulty in removal after unlocking due to being embedded in the shell by setting a compression spring arranged longitudinally on the bottom wall of the protective shell. It achieves multiple technical effects, such as providing axial flexible buffer to protect the threads when inserted, providing reverse force to eliminate axial movement gap when locked, and actively pushing the bolt outward when removed so that the operator can quickly grab it. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure proposed in this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the gripper structure of a high-strength, wear-resistant, corrosion-resistant bolt surface strengthening and protection structure proposed in this utility model.

[0024] Legend:

[0025] 1. Protective shell; 2. Stud; 3. Locking mechanism; 4. Gripper; 5. Groove; 6. Rotating shaft; 7. Spring 1; 8. Spring 2. Detailed Implementation

[0026] 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.

[0027] Example:

[0028] Reference Figures 1 to 3 This utility model provides a surface-strengthening and protective structure for high-strength wear-resistant and corrosion-resistant bolts, which aims to solve the problems in the prior art where high-strength bolts are easily damaged by collisions during storage and transportation, and where unreliable fixing structures cause bolts to shift and fall off.

[0029] A high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure includes a protective shell 1, a stud 2 disposed inside the protective shell 1, a locking mechanism 3 located at the top of the protective shell 1, and a spring 8 located at the bottom of the protective shell 1. The protective shell 1 serves as the basic support and protective carrier of the overall device. It has an overall hollow tubular column structure. The protective shell 1 is made of high-strength impact-resistant material. The inner diameter of the protective shell 1 is designed to be larger than the screw diameter of the stud 2, and the axial length of the protective shell 1 is greater than or equal to the total length of the stud 2. It is used to completely house the stud 2 in its internal cavity, thereby preventing external hard objects from scratching or colliding with the surface of the stud 2 through physical isolation, and reducing the direct contact between the environmental corrosive medium and the stud 2.

[0030] A second spring 8 is fixedly connected to the bottom of the inner part of the protective shell 1. The second spring 8 serves as an elastic buffer and auxiliary ejection component at the bottom. The second spring 8 is a cylindrical helical compression spring. The bottom end of the second spring 8 is fixed to the center of the inner bottom wall of the protective shell 1 by welding or strong adhesive. The axis of the second spring 8 coincides with the central axis of the protective shell 1. After the stud 2 is inserted into the protective shell 1, the end face of the stud 2 directly abuts against the top of the second spring 8. In order to increase the contact area and protect the thread at the end of the stud 2, a support washer is provided at the top of the second spring 8. The stud 2 compresses the second spring 8 through the support washer. The axial reaction force generated by the second spring 8 gives the stud 2 an outward pre-tightening tendency, eliminates the axial movement gap of the stud 2, and absorbs the vibration energy during transportation.

[0031] The protective shell 1 has a locking mechanism 3 at its open end. The locking mechanism 3 is used to form an openable and closable mechanical limit at the port of the protective shell 1. The locking mechanism 3 is mainly composed of a groove 5, a gripper 4, a rotating shaft 6 and a spring 7. Multiple grooves 5 are evenly opened circumferentially on the end face of the open end of the protective shell 1. The grooves 5 penetrate the thickness of the side wall of the protective shell 1, providing space for the installation and movement of the gripper 4. Each groove 5 has a corresponding gripper 4 installed in it. The gripper 4 is rotatably connected between the two inner walls of the groove 5 through the rotating shaft 6. The two ends of the rotating shaft 6 are embedded in the side wall of the protective shell 1 and fixed. The axis of the rotating shaft 6 is perpendicular to the central axis of the protective shell 1, so that the gripper 4 can swing back and forth around the rotating shaft 6 at a certain angle in the groove 5, thereby changing the diameter of the opening of the protective shell 1.

[0032] Spring 7 is connected between the gripper 4 and the protective shell 1. Spring 7 is a tension helical spring, which is arranged on the outside of the protective shell 1. One end of spring 7 is fixedly hooked on the side wall of the gripper 4 located outside the protective shell 1, and the other end of spring 7 is fixedly hooked on the corresponding protrusion or hook on the outer wall of the protective shell 1. Spring 7 is always in a stretched state. It uses its rebound tension to apply a continuous deflection torque to the gripper 4, causing the upper end of the gripper 4 to deflect outward and the lower end to contract and converge towards the central axis of the protective shell 1, thereby forming a closed locking state in a natural state.

[0033] The gripper 4 is constructed as a longitudinal lever structure with the rotating shaft 6 as the rotation center. It includes a force-applying end located above the rotating shaft 6 and a clamping end located below the rotating shaft 6. The force-applying end extends upward and protrudes beyond the outer diameter range of the protective shell 1. Its outer surface is designed with anti-slip texture to facilitate the operator's hand gripping or pressing. The clamping end is inserted into the internal cavity of the protective shell 1 through the groove 5. The inner surface of the end of the clamping end is integrally formed with a snap hook that highly matches the shape of the head of the stud 2. The snap hook is designed as an inwardly protruding right-angle step or wedge block. The specific shape depends on the standard specification of the head of the stud 2. It is designed to be embedded in the lower edge of the head of the stud 2 or close to the top edge of the head of the stud 2, thereby forming a rigid limit on the stud 2 in the axial direction.

[0034] Meanwhile, the outer wall surface of the protective shell 1 is provided with a positioning protrusion or hanging hole corresponding to the installation position of the spring-7. The spring-7 is located on the outside of the protective shell 1 in terms of spatial layout. The bottom end of the spring-7 is fixedly hooked or connected to the positioning protrusion through a pin. The top end of the spring-7 is fixedly connected to the outer side of the force-applying end of the gripper 4. Since the free length of the spring-7 is less than the installation distance, it always maintains a stretched and stored energy state. The elastic tension it generates acts on the force-applying end of the gripper 4, which is converted into a rotational torque that drives the clamping end to tighten inward through the rotating shaft 6. This causes the clamping ends of multiple circumferentially distributed grippers 4 to form a closed loop that converges towards the center at the opening of the protective shell 1, tightly gripping the head of the stud 2. This lever-type clamping cooperation based on elastic preload ensures that even if there is severe vibration during transportation, the gripper 4 can always maintain a high-strength lock on the stud 2, preventing it from loosening or colliding with the inner wall of the protective shell 1.

[0035] In a preferred embodiment, spring 28 is preferably a cylindrical helical compression spring. The bottom end of spring 28 is fixedly connected to the center of the bottom wall of the inner cavity of the protective shell 1 by spot welding or strong adhesive bonding. A support pad is fixedly connected to the top end of spring 28. The support pad is made of wear-resistant rubber or soft metal material. The upper surface area of ​​the support pad is designed to be larger than the cross-sectional area of ​​the end of the stud 2, so that the end face of the stud 2 can completely fit on the support pad after it is inserted. The support pad is used to isolate the metal break of spring 28 from direct contact with the surface of the stud 2, preventing hard scratches.

[0036] As a preferred embodiment, a protrusion is integrally formed on the outer circumferential wall of the protective shell 1 corresponding to the position of each gripper 4. The protrusion is constructed as a hook shape that extends outward and bends upward. The pull ring at the lower end of the spring-7 is sleeved on the protrusion. A hanging hole is opened on the outer side of the force-applying end of the gripper 4. The pull ring at the upper end of the spring-7 passes through the hanging hole for connection. This hanging structure makes it easy to replace and maintain the spring-7, and maintains a stable tensile force line in the working state.

[0037] In a preferred embodiment, the groove 5 is a rectangular through groove, and the width of the groove 5 is slightly larger than the thickness of the gripper 4, forming a clearance fit between the two. The rotating shaft 6 is made of high-strength stainless steel cylindrical pin. The middle part of the rotating shaft 6 passes through the pin hole in the middle of the gripper 4 and is connected to the pin hole through a clearance fit. The two ends of the rotating shaft 6 are respectively press-fitted into the pre-made mounting holes on the side walls of the protective shell 1 on both sides of the groove 5, thereby suspending and positioning the gripper 4 in the center of the groove 5, ensuring that the gripper 4 rotates smoothly and stably around the rotating shaft 6, and will not mechanically interfere with the side walls of the protective shell 1.

[0038] The implementation principle of this application embodiment is as follows: The surface-strengthened protective structure for high-strength wear-resistant bolts is a key device for improving the safety of bolt storage and transportation. Its core structure consists of a protective shell 1 outside the stud 2 and an auxiliary locking mechanism 3, which can specifically solve the problem of high-strength bolts being susceptible to impact and corrosion. These types of bolts are often used in harsh environments such as heavy industry and chemical industry. In addition to relying on precision machining to ensure performance, the addition of a protective structure can further extend their service life.

[0039] For high-strength, wear-resistant bolts, in addition to processing, they can be protected by a protective shell 1. Unused studs 2 can be placed inside the protective shell 1 for collision protection. During placement, firstly, the clamping jaws 4 are rotated around the groove 5 and connected to the rotating shaft 6, while simultaneously stretching the spring 7. At this point, the stud 2 can enter from the bottom of the protective shell 1. After the stud 2 is fully inserted, it compresses the spring 8 inward, releasing the clamping jaws 4. The spring 7 will reset under the preload, causing the clamping jaws 4 to rotate in the opposite direction around the rotating shaft 6 and retract. Finally, the bottom of the clamping jaws 4 will firmly lock the head of the stud 2, forming a stable locking effect and preventing the stud 2 from shifting during transport. This elastic fixing structure combines convenience and reliability, providing an efficient solution for the storage and protection of high-strength bolts.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-strength, wear-resistant, and corrosion-resistant bolt surface reinforcement and protection structure, characterized in that, include: Protective shell (1), stud (2), locking mechanism (3) and spring 2 (8); The protective shell (1) is a hollow tubular structure, and the stud (2) is disposed inside the protective shell (1); The second spring (8) is disposed at the bottom of the inner part of the protective shell (1), and the end of the stud (2) abuts against and compresses the second spring (8). The locking mechanism (3) is located at the open end of the protective shell (1). The locking mechanism (3) includes a groove (5), a gripper (4), a rotating shaft (6), and a spring (7). The groove (5) is formed at the end of the protective shell (1), and the groove (5) penetrates the wall thickness of the protective shell (1); The gripper (4) is disposed in the groove (5), the rotating shaft (6) passes through the middle of the gripper (4) and is fixed at both ends to the inner wall of the groove (5), and the gripper (4) is rotatably connected to the protective shell (1) through the rotating shaft (6). The first spring (7) is connected between the jaw (4) and the protective shell (1). The first spring (7) provides a preload force to drive the jaw (4) to rotate around the pivot (6), so that the bottom end of the jaw (4) clamps the head of the stud (2), and the elastic force of the second spring (8) fixes the stud (2) inside the protective shell (1).

2. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, The spring one (7) is a tension spring. One end of the spring one (7) is fixedly connected to the side of the gripper (4) located outside the protective shell (1), and the other end of the spring one (7) is fixedly connected to the outer wall of the protective shell (1). When the gripper (4) clamps the stud (2), the spring one (7) is in a tension state.

3. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, The gripper (4) includes a force-applying end located above the rotating shaft (6) and a clamping end located below the rotating shaft (6). The inner side of the clamping end is provided with a slot that is adapted to the shape of the head of the stud (2). The gripper (4) is engaged with the head of the stud (2) through the slot.

4. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, The grooves (5) are evenly distributed circumferentially along the opening end of the protective shell (1), the number of the claws (4) is the same as the number of the grooves (5), and the multiple claws (4) together form a multi-point circumferential clamping of the head of the stud (2).

5. The high-strength wear-resistant and corrosion-resistant bolt surface strengthening and protection structure according to claim 1, characterized in that, The axis of the rotating shaft (6) is perpendicular to the central axis of the protective shell (1), and the plane in which the gripper (4) rotates around the rotating shaft (6) passes through the central axis of the protective shell (1).

6. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, The second spring (8) is a compression spring. The bottom of the second spring (8) is fixed to the inner bottom wall of the protective shell (1). The top of the second spring (8) is provided with a washer for supporting the end of the stud (2).

7. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, The outer wall of the protective shell (1) is provided with a protrusion corresponding to the position of the spring (7), and the spring (7) is hooked on the protrusion.

8. The high-strength wear-resistant and corrosion-resistant bolt surface reinforcement and protection structure according to claim 1, characterized in that, When the stud (2) is not inserted, the jaw (4) is in a contracted state under the action of the spring (7), and the inner diameter formed by the bottom end of the jaw (4) is smaller than the outer diameter of the head of the stud (2); when the upper end of the jaw (4) is pried outward, the spring (7) is stretched, and the bottom end of the jaw (4) opens to allow the stud (2) to enter and exit.

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