Metal fastener with self-locking structure

Abstract

The utility model discloses a metal fastener with a self-locking structure, and belongs to the technical field of metal fasteners. A metal fastener with a self-locking structure comprises a bolt body, the bolt body is mainly composed of a rod part, a head part and a threaded part, the threaded part is fixedly installed on the rod part, a pressing edge is fixedly installed on the outer end face of the threaded part and has a preset inclination angle, and when the rod part is screwed into a hole position, the pressing edge is in press fit with the threaded end face of the hole position; an inclined surface is arranged on the head part, and pressing grains are annularly distributed on the inclined surface of the head part; the pressing piece is fixedly mounted on the end face of the rod part; according to the self-locking bolt, the pressing lines and the pressing edges are used in cooperation, the pre-tightening force after the bolt body is installed is effectively improved, meanwhile, the pressing piece can prevent the situation that the bolt body axially displaces after the pre-tightening force is reduced due to equipment vibration, and therefore the bolt body achieves the self-locking effect, and the stability and safety of equipment during working are improved.

Description

Technical Field

[0001] This utility model relates to the field of metal fastener technology, and in particular to a metal fastener with a self-locking structure. Background Technology

[0002] Metal fasteners are metal components used to connect, fix, or seal mechanical parts and structural components. They mainly achieve their function through mechanical engagement, threaded fit, or interference fit. Common categories include bolts, nuts, screws, studs, washers, pins, rivets, and snap rings / retaining rings. The specific selection needs to consider factors such as load, environmental conditions, and disassembly requirements.

[0003] The structure of a bolt mainly consists of three parts: head, shank, and threaded part. The head provides the force-bearing surface for tightening with tools, the shank is the smooth part connecting the head and the thread, and the threaded part is used to mate with a nut or internal thread. When using a bolt, it is necessary to select matching bolts, nuts, and washers. First, pass the bolt through the hole of the part to be connected, install the washer, tighten the nut, and apply the specified preload. In special environments such as vibration, anti-loosening measures such as double nuts, locking washers, or thread sealant are also required.

[0004] In existing technologies, when bolted fasteners are used to fasten mechanical equipment, the vibrations generated during equipment operation are transmitted to the bolted connection, causing the preload between the bolt and nut to decrease. This continuous decrease in preload will lead to loosening of the connection, making it difficult for the bolt to maintain an effective fastening effect on the connection of the mechanical equipment. Ultimately, this results in the technical problem of loosening and failure of the equipment connection, which poses a significant risk to the stable operation and safety performance of the equipment. Utility Model Content

[0005] The purpose of this invention is to solve the problem that when conventional bolts are used in the prior art, equipment vibration will cause the preload between the bolt and nut to decrease, resulting in loosening and failure of the equipment connection. Therefore, this invention proposes a metal fastener with a self-locking structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A metal fastener with a self-locking structure includes a bolt body, which mainly consists of a shank, a head, and a threaded portion. It further includes: a threaded portion fixedly mounted on the shank, wherein a clamping flange is fixedly mounted on the outer end face of the threaded portion, the clamping flange having a preset angle, and when the shank is screwed into a hole, the clamping flange presses against the threaded end face of the hole; an inclined surface is provided on the head, and clamping grooves are arranged in a ring on the inclined surface of the head, and when the shank is screwed into the hole, the clamping grooves press tightly against the equipment connection surface; and a clamping member fixedly mounted on the end face of the shank, which can expand outwards after the shank is screwed into the hole.

[0008] To improve the self-locking effect of the tether, preferably, the pressing component includes deformation plates arranged in a ring on the end face of the rod, with a conical movable cavity formed in the middle of the deformation plates, and the top of the deformation plates being fixedly installed with the bottom of the rod. A movable rod is slidably installed inside the rod, and a circular plate is fixedly installed in the middle of the movable rod, and the circular plate is slidably installed in the conical movable cavity. An adjusting plate is fixedly installed at the bottom of the movable rod. When the tether is installed, pulling the adjusting plate moves the movable rod and the circular plate downward and pushes the deformation plates outward.

[0009] To facilitate the outward deformation of the deformation plates, a deformation gap is reserved between adjacent deformation plates, and a push rod is slidably installed in the deformation gap. The push rod is fixedly installed on the cylindrical surface of the circular plate. When the circular plate slides downward, the push rod slides in the deformation gap.

[0010] To facilitate the insertion of the press-fit part into the hole, a fastening plate is further fixedly installed on the cylindrical surface of the deformation plate, and the ratio of the outer diameter of the fastening plate at its initial position to the outer diameter of the threaded part is 9:10.

[0011] To reduce resistance during bolt installation, preferably, the rotation direction of the clamping groove is consistent with the rotation direction of the threaded portion, and the end face of the clamping groove is provided with an inclined surface.

[0012] To increase the pre-tightening force after the bolt is installed into the hole, preferably, the angle range of the preset tilt angle of the clamping edge is 30-60 degrees.

[0013] Compared with the prior art, the present invention provides a metal fastener with a self-locking structure, which has the following advantages:

[0014] 1. This metal fastener with a self-locking structure uses a clamping flange and clamping groove on the threaded part to lock the clamping flange with the internal thread of the equipment after the bolt body is installed into the hole, thereby increasing the preload. At the same time, the clamping groove forms a tight pressing effect with the connection surface of the equipment, preventing vibration during equipment operation from reducing the bolt preload and causing the connection part of the equipment to loosen and fail, which poses a significant risk to the stable operation and safety performance of the equipment.

[0015] 2. This metal fastener with a self-locking structure works in conjunction with a deformation plate and a snap-fit ​​plate in the pressing component. By pulling the adjusting plate, the movable rod and the top rod move, which in turn pushes the deformation plate to expand outward. At this time, the snap-fit ​​plate moves and fits against the bottom surface of the hole in the equipment, preventing the bolt body from axially displacing due to equipment vibration, which could lead to loosening of the equipment connection. This effectively improves the stability and safety of the equipment during operation.

[0016] The parts not mentioned in this device are the same as or can be implemented using existing technology. This utility model uses the pressing groove and pressing edge together to effectively increase the pre-tightening force after the bolt is installed. At the same time, the pressing part can prevent the bolt from axially displacing due to the reduction of pre-tightening force caused by equipment vibration, thereby achieving a self-locking effect of the bolt and improving the stability and safety of the equipment during operation. Attached Figure Description

[0017] Figure 1 This is an isometric structural diagram of a metal fastener with a self-locking structure proposed in this utility model;

[0018] Figure 2 This is a partial structural diagram of a metal fastener with a self-locking structure proposed in this utility model;

[0019] Figure 3 This utility model proposes a metal fastener with a self-locking structure. Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 This is a bottom view of a metal fastener with a self-locking structure proposed in this utility model.

[0021] In the diagram: 1. Bolt body; 11. Rod; 12. Head; 2. Threaded part; 21. Clamping edge; 3. Clamping groove; 4. Deformation plate; 41. Fastening plate; 5. Movable rod; 51. Top rod; 52. Adjusting plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example

[0024] Reference Figures 1-4A metal fastener with a self-locking structure includes a bolt body 1, which mainly consists of a rod 11, a head 12, and a threaded portion 2. It also includes the threaded portion 2, which is fixedly mounted on the rod 11. A clamping flange 21 is fixedly mounted on the outer end face of the threaded portion 2. The clamping flange 21 has a preset angle. When the rod 11 is screwed into a hole, the clamping flange 21 presses against the threaded end face of the hole. Through the engagement of the clamping flange 21 with the thread of the equipment hole, the threaded portion 2 and the clamping flange 21 engage with the equipment thread. The tight engagement enhances the preload of the bolt body 1, preventing vibrations during equipment operation from reducing the preload and thus preventing the bolt body 1 from moving within the hole. An inclined surface is provided on the head 12, with clamping grooves 3 arranged in a ring on this surface. The rotation direction of the clamping grooves 3 is consistent with the rotation direction of the threaded portion 2, and the end faces of the clamping grooves 3 are inclined. This reduces resistance during the rotational installation of the bolt body 1, and the inclined surfaces of the clamping grooves 3 prevent the bolt body 1 from... Due to the possibility of reversal caused by vibration, the resistance to reverse rotation of bolt 1 is increased, further enhancing the locking effect after bolt 1 is installed. When rod 11 is screwed into the hole, the clamping groove 3 is tightly pressed against the equipment connection surface. When the clamping groove 3 is tightly pressed against the equipment connection surface, it can prevent the bolt from rotating circumferentially due to vibration generated by equipment operation, further enhancing the self-locking effect of bolt 1 after installation. This effectively avoids the problem of loosening or failure of equipment connection due to loosening of bolt 1. A clamping component is fixedly installed on the end face of rod 11. When rod 11 is screwed into the hole, the clamping component can expand outward. The outward expansion of the clamping component enables an interference fit between bolt 1 and equipment connection. On the other hand, after the clamping component is fitted with the equipment, it can prevent axial movement of bolt 1, thereby improving the stability of bolt 1 after installation. This avoids the problem of loosening or failure of equipment connection due to the decrease of preload caused by vibration generated by equipment operation, effectively improving the stability and safety of equipment operation.

[0025] Specifically, the clamping edge 21 and clamping groove 3 provided in the threaded part 2 work together to lock the clamping edge 21 with the internal thread of the equipment after the bolt body 1 is installed into the hole, thereby increasing the preload. At the same time, the clamping groove 3 forms a tight pressing effect with the connection surface of the equipment, preventing vibration during equipment operation, which could lead to a reduction in bolt preload and cause the connection part of the equipment to loosen and fail, posing a significant risk to the stable operation and safety performance of the equipment.

[0026] The pressing component includes deformable plates 4 arranged in a ring on the end face of the rod 11. A conical movable cavity is formed in the middle of each deformable plate 4, and the top of each deformable plate 4 is fixedly installed to the bottom of the rod 11. A movable rod 5 is slidably installed inside the rod 11. A guide groove is provided inside the rod 11 corresponding to the movable rod 5, and a limiting head is provided at the top of the movable rod 5. The limiting head is slidably installed in the guide groove. When the movable rod 5 slides in the guide groove, the limiting head contacts the bottom of the guide groove to limit the movable rod 5, effectively preventing the movable rod 5 from detaching from the rod 11, thus preventing the deformable plates 4 from being squeezed by the circular plate and losing their deformability. The effect of deformation after extrusion and interference fit with the equipment is achieved by fixing a circular plate in the middle of the movable rod 5 and sliding the circular plate in the conical movable cavity. At the same time, the upper surface of the circular plate is in contact with the bottom end of the rod 11. An adjusting plate 52 is fixedly installed at the bottom end of the movable rod 5. After the bolt 1 is installed, the adjusting plate 52 is pulled, the movable rod 5 and the circular plate move down and push the deformation plate 4 outward, so that the bottom of the deformation plate 4 expands outward, thereby making the deformation plate 4 fit with the equipment hole and achieving the interference fit effect. This increases the pre-tightening force of the bolt 1 and the equipment after installation and avoids the problem of loosening at the connection due to equipment vibration.

[0027] A deformation gap is reserved between adjacent deformation plates 4, and a top rod 51 is slidably installed in the deformation gap. The top rod 51 is fixedly installed on the cylindrical surface of the circular plate. When the circular plate slides downward, the top rod 51 slides in the deformation gap. The deformation gap facilitates the expansion of the deformation plates 4 to the outside, avoiding mutual compression between the deformation plates 4, which would make it difficult for the deformation plates 4 to move.

[0028] A fastening plate 41 is fixedly installed on the cylindrical surface of the deformation plate 4, and the ratio of the outer diameter of the fastening plate 41 at its initial position to the outer diameter of the threaded part 2 is 9:10. The initial position of the fastening plate 41 forms a cone shape with the deformation plate 4, which makes it easy for the fastening part to enter the hole, and facilitates the subsequent expansion of the deformation plate 4 to the outside, thereby making it easier for the bolt 1 to be installed into the hole of the equipment.

[0029] Specifically, the deformation plate 4 and the fastening plate 41 set by the pressing component are used together. By pulling the adjusting plate 52, the movable rod 5 and the top rod 51 are moved, which in turn pushes the deformation plate 4 to expand outward. At this time, the fastening plate 41 moves and fits against the bottom surface of the hole of the equipment, which prevents the bolt body 1 from axially displacing due to equipment vibration, thus preventing the equipment connection from becoming loose. This effectively improves the stability and safety of the equipment during operation.

[0030] The preset tilt angle of the clamping flange 21 is in the range of 30-60 degrees. The preferred preset tilt angle of the clamping flange 21 in this application is 45 degrees. On the one hand, the 45-degree tilt angle maximizes the engagement effect between the clamping flange 21 and the thread of the equipment hole, thereby improving the tightness of the bolt body 1 after installation. On the other hand, if the angle is too large, the engagement effect will be reduced, while if the angle is too small, the resistance of the bolt body 1 will increase during installation, resulting in the problem of inconvenient installation of the bolt body 1.

[0031] In this utility model, the bolt body 1 is first aligned with the equipment hole, and then the bolt body 1 is installed using a tool. After the bolt body 1 is installed, the clamping edge 21 provided on the threaded part 2 is tightly engaged with the thread of the equipment hole, thereby improving the warning effect of the bolt body 1. At the same time, the clamping groove 3 provided on the head 12 is tightly pressed with the equipment connection surface. The clamping groove 3 is provided with an inclined surface, which makes the resistance of the bolt body 1 during installation smaller. Conversely, when the equipment vibrates during operation, the resistance of the bolt body 1 to reverse is stronger, thereby avoiding the bolt body 1 from rotating circumferentially, which would cause the pre-tightening force to decrease and thus cause the equipment connection to loosen.

[0032] Simultaneously, after the bolt body 1 is installed, the pressing component is pulled by adjusting plate 52 to move the movable plate downward. Then, the push rod 51 moves within the deformation gap to lift the deformation plate 4. At this time, the bottom of the deformation plate 4 expands outward, thus forming an interference fit between the deformation plate 4 and the equipment. At the same time, the fastening plate 41 moves outward with the deformation plate 4. At this time, the fastening plate 41 fits against the bottom of the equipment hole. By using the fastening plate 41 in conjunction with the head 12, when the mechanical equipment vibrates during operation, it can prevent the bolt body 1 from axially moving, effectively improving the stability of the bolt body 1 after installation, thereby improving the stability and safety of the equipment during operation.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A metal fastener with a self-locking structure, comprising a bolt body (1), said bolt body (1) mainly composed of a rod portion (11), a head (12), and a threaded portion (2), characterized in that, Also includes: The threaded part (2) is fixedly installed on the rod (11). Among them, the outer end face of the threaded part (2) is fixedly installed with a clamping flange (21). The clamping flange (21) has a preset tilt angle. When the rod part (11) is screwed into the hole, the clamping flange (21) is pressed against the threaded end face of the hole. The head (12) is provided with an inclined surface. The inclined surface of the head (12) is arranged with clamping grooves (3) in a ring. When the rod part (11) is screwed into the hole, the clamping grooves (3) are pressed tightly against the equipment connection surface. The pressing component is fixedly installed on the end face of the rod (11). When the rod (11) is screwed into the hole, the pressing component can expand outward.

2. A metal fastener with a self-locking structure according to claim 1, characterized in that, The pressing component includes deformation plates (4) arranged in a ring on the end face of the rod (11), with a conical movable cavity formed in the middle of several deformation plates (4), and the top of the deformation plates (4) being fixedly installed to the bottom of the rod (11). The rod (11) has a movable rod (5) slidably installed inside it. A circular plate is fixedly installed in the middle of the movable rod (5), and the circular plate is slidably installed in the conical movable cavity. An adjusting plate (52) is fixedly installed at the bottom of the movable rod (5). When the bolt (1) is installed, the adjusting plate (52) is pulled, the movable rod (5) and the circular plate move down and push the deformation plate (4) to the outside.

3. A metal fastener with a self-locking structure according to claim 2, characterized in that, A deformation gap is reserved between adjacent deformation plates (4), and a top rod (51) is slidably installed in the deformation gap. The top rod (51) is fixedly installed on the cylindrical surface of the circular plate. When the circular plate slides downward, the top rod (51) slides in the deformation gap.

4. A metal fastener with a self-locking structure according to claim 3, characterized in that, A fastening plate (41) is fixedly installed on the cylindrical surface of the deformation plate (4), and the ratio of the outer diameter of the fastening plate (41) at its initial position to the outer diameter of the threaded part (2) is 9:

10.

5. A metal fastener with a self-locking structure according to claim 1, characterized in that, The rotation direction of the pressing groove (3) is consistent with the rotation direction of the threaded part (2), and the end face of the pressing groove (3) is provided with an inclined surface.

6. A metal fastener with a self-locking structure according to claim 1, characterized in that, The preset tilt angle of the clamping edge (21) is in the range of 30-60 degrees.

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