Anti-loosening structure of bolt fastener

Abstract

The utility model discloses a kind of anti-loosening structures of bolt fastener applied to the technical field of bolt fastener, including limiting disc, chuck located below limiting disc and two clamping assemblies fixedly connected in the outer end of limiting disc, square limiting slot is opened in bolt tail along axial direction, the outer thread of bolt is connected with nut, limiting disc is threadedly connected in the outer wall of bolt, chuck is sleeved in the outer portion of bolt, limiting disc is below nut and is in contact with nut, the center of chuck is fixedly connected with boss along axis, the width of boss is same with the width of limiting slot, two clamping assemblies are symmetrical about the central axis of limiting disc, clamping assembly includes fixed base, connecting block, spring telescopic link and L type clamping block, by above-mentioned structure, preliminary improve the pretightening force of original nut, to improve the stability of nut, the adaptability of the cooperation of locking assembly and chuck to different thicknesses of connected member is improved.

Description

Technical Field

[0001] This utility model relates to the field of bolt fasteners, and in particular to an anti-loosening structure for bolt fasteners. Background Technology

[0002] Bolts are mechanical parts widely used in the field of machinery and modern industry. Their main function is to detachably connect two or more components together by means of preload.

[0003] Chinese utility model patent CN222991898U discloses a bolt structure for preventing vibration and loosening, including a regular hexagonal prism block, a screw fixedly connected to the surface of the regular hexagonal prism block, a nut threadedly connected to the side wall of the screw, a washer sleeved on the outside of the screw, a slot formed on the side wall of the screw, six rectangular blocks evenly fixedly connected to the surface of the nut, a retaining frame slidably connected inside the rectangular blocks, six baffles evenly fixedly connected to the surface of the nut, two spring pieces fixedly connected to the surface of the retaining frame, the side of the spring pieces away from the retaining frame having an arc-shaped structure, and two sliding rods slidably connected inside the screw, both of which are located inside the retaining slot.

[0004] In the above technical solution, due to the inconsistent thickness of the connected parts, the position of the locking frame cannot be aligned with the locking groove when the nut is tightened, thus failing to achieve the locking function of the nut. Utility Model Content

[0005] The core of this invention lies in its design of using a clamping assembly to press the chuck tightly to prevent it from moving along the bolt axis, thus solving the problem of nut loosening during operation in existing technologies. Simultaneously, by setting a limiting assembly on the outer wall of the chuck to further limit and fix the clamping assembly, the device can adapt to locking and fixing connected parts of different thicknesses.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] An anti-loosening structure for bolt fasteners includes a limiting disc, a chuck located below the limiting disc, and two clamping assemblies fixedly connected to the outer end of the limiting disc. A square limiting groove is provided axially at the tail of the bolt, and a nut is threaded onto the external thread of the bolt. The limiting disc is threaded onto the outer wall of the bolt, and the chuck is sleeved on the outside of the bolt. The limiting disc is located below the nut and abuts against the nut. A protrusion is fixedly connected along the axis at the center of the chuck, and the width of the protrusion is the same as the width of the limiting groove. The two clamping components are symmetrical about the central axis of the limiting disc. The clamping components include a fixed base, a connecting block, a spring telescopic rod, and an L-shaped locking block. The fixed base is fixedly connected to the outer wall of the limiting disc. The fixed base and the connecting block are rotatably connected by a torsion spring. The spring telescopic rod is fixedly connected between the connecting block and the L-shaped locking block. The upper end of the horizontal section of the L-shaped locking block abuts against the lower end face of the chuck.

[0008] Furthermore, the inner wall of the vertical section of the L-shaped card block is arc-shaped, and the inner wall of the vertical section of the L-shaped card block fits into the outer wall of the chuck.

[0009] Furthermore, when not in operation, the horizontal angle between the fixed seat and the spring telescopic rod is between 60° and 80°, and the thickness of the chuck is greater than the distance between the fixed seat and the horizontal section of the L-shaped chuck block.

[0010] Furthermore, when the clamping assembly is not in operation, the horizontal angle between the fixed seat and the spring telescopic rod is between 60° and 80°, and when the clamping assembly is in normal operation, the upper surface of the horizontal section of the L-shaped clamping block is higher than the lower surface of the chuck.

[0011] Meanwhile, the outer wall of the chuck is provided with an annular groove, and a limit component is provided in the annular groove. Multiple rectangular grooves are evenly provided on the outer wall of the chuck, and the multiple rectangular grooves are all located below the annular groove.

[0012] Furthermore, the limiting component includes a slider, a connecting seat, and a limiting block. The slider is slidably connected inside the annular groove. The slider and the connecting seat are rotatably connected by a bearing. The connecting seat and the limiting block are rotatably connected by a torsion spring. The width of the limiting block is the same as the width of the rectangular groove. Both ends of the limiting block are fixedly connected with elastic pads.

[0013] Furthermore, the included angle between the connecting seat and the limiting block is 70°-90°, and in the working state, the included angle between the connecting seat and the limiting block is 90°.

[0014] Compared with existing technologies, the advantages of this utility model are: (1) This solution improves the preload of the original bolt and nut by connecting the limiting disc thread to the outer wall of the bolt, thereby significantly increasing the friction between the nut and the bolt thread and thus resisting loosening caused by vibration.

[0015] (2) A rectangular limiting groove is opened at the tail of the bolt along the axis. A chuck is set below the limiting disc. The width of the protrusion in the center of the chuck matches the width of the limiting groove, so that the chuck cannot rotate. The clamping component fixedly connected to the outer wall of the limiting disc increases the friction of the L-shaped chuck block on the chuck through the torque of the torsion spring and the tension of the spring telescopic rod, thereby further improving the anti-loosening effect of the device.

[0016] (3) By setting an annular groove, a rectangular groove and a locking component on the outer wall of the chuck, the locking component can rotate along the annular groove. When locking, the locking component is moved to the two sides of the two clamping components respectively, and then inserted into the rectangular groove of the adjacent clamping component to further fix the clamping component and prevent it from driving the limiting disc to rotate. At the same time, elastic washers are fixedly connected on both sides of the locking component to reduce the phenomenon that the locking component is difficult to accurately lock the clamping component when it is inserted into the rectangular groove when the bolt is connected to the connected parts of different thicknesses. Attached Figure Description

[0017] Figure 1 This is an assembly drawing of the present utility model; Figure 2 This is a perspective view of the clamping assembly of this utility model; Figure 3 This is a flowchart illustrating the operation of the clamping assembly of this utility model. Figure 4 This is an assembly drawing of the second embodiment of the present utility model; Figure 5 This is a perspective view of the present utility model; Figure 6 This is a cross-sectional view of the present invention; Figure 7 This is a bottom view of the present invention; Figure 8 This is an exploded view of the locking component of this utility model.

[0018] Explanation of the labels in the diagram: 1. Limiting disc, 2. Limiting groove, 3. Protrusion, 41. Fixing seat, 42. Connecting block, 43. Spring telescopic rod, 44. L-shaped locking block, 5. Annular groove, 6. Rectangular groove, 71. Slider, 72. Connecting seat, 73. Limiting block, 74. Elastic pad, 8. Chuck. Detailed Implementation

[0019] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0020] First implementation method: Figure 1 The diagram shows a limiting disc 1, a chuck 8 located below the limiting disc 1, and two clamping assemblies fixedly connected to the outer ends of the limiting disc 1, with bolts ( Figure 1 (represented by a) A square limiting groove 2 is provided at the tail along the axial direction. A nut is connected to the external thread of the bolt. The limiting disc 1 is threaded to the outer wall of the bolt. The chuck 8 is sleeved on the outside of the bolt. The limiting disc 1 is located below the nut and abuts against the nut. A protrusion 3 is fixedly connected to the center of the chuck 8 along the axis. The width of the protrusion 3 is the same as the width of the limiting groove 2. The two clamping components are symmetrical about the central axis of the limiting disk 1. The clamping components include a fixed base 41, a connecting block 42, a spring telescopic rod 43, and an L-shaped locking block 44. The fixed base 41 is fixedly connected to the outer wall of the limiting disk 1. The fixed base 41 and the connecting block 42 are rotatably connected by a torsion spring. The spring telescopic rod 43 is fixedly connected between the connecting block 42 and the L-shaped locking block 44. The upper end of the horizontal section of the L-shaped locking block 44 abuts against the lower end face of the chuck 8.

[0021] Figure 2 As shown, the inner wall of the vertical section of the L-shaped card block 44 is arc-shaped, and the inner wall of the vertical section of the L-shaped card block 44 fits against the outer wall of the chuck 8.

[0022] Figure 3 As shown, when not in operation, the horizontal angle between the fixed base 41 and the spring telescopic rod 43 is between 60° and 80°, and the thickness of the chuck 8 is greater than the distance between the fixed base 41 and the horizontal section of the L-shaped clamping block 44, so that when the chuck 8 is clamped, it is simultaneously subjected to the torque of the torsion spring and the tension of the spring telescopic rod 43, thereby improving the stability of the device.

[0023] Working principle: Bolt and nut to the connected parts ( Figure 1 After initial locking (represented by b), the limiting disc 1 is rotated along the thread of the bolt and pressed tightly against the lower surface of the nut. Then, the protrusion 3 of the chuck 8 is inserted into the limiting groove 2, and the chuck 8 is slid towards the limiting disc 1. The protrusion 3 being inserted into the limiting groove 2 allows the chuck 8 to slide up and down only along the bolt axis. The worker pries the L-shaped locking block 44 outward along the axis of the torsion spring and continues to push the chuck 8 until it is pressed tightly against the limiting disc 1. Then, the worker pulls the L-shaped locking block 44 downward until the upper end of the horizontal section of the L-shaped locking block 44 is lower than the lower end of the chuck 8. Then, the worker releases the L-shaped locking block 44, allowing it to automatically rebound under the action of the spring telescopic rod 43 and abut against the lower end of the chuck 8. With the torque of the torsion spring and the tension of the spring telescopic rod 43 working together, the clamping assembly fixes the chuck 8, making it difficult for the limiting disc 1 to rotate and loosen during vibration, thereby achieving the anti-loosening effect of the bolt and nut.

[0024] Second implementation method: This embodiment adds a limiting component, an annular groove, and a rectangular groove to the first embodiment, while the rest remains the same as the first embodiment.

[0025] Figure 4 As shown, the outer wall of the chuck 8 is provided with an annular groove 5, and a limit component is provided in the annular groove 5. Multiple rectangular grooves 6 are uniformly provided on the outer wall of the chuck 8, and the multiple rectangular grooves 6 are all located below the annular groove 5.

[0026] Figures 4-8As shown, the limiting assembly includes a slider 71, a connecting seat 72, and a limiting block 73. The slider 71 is slidably connected inside the annular groove 5. The slider 71 and the connecting seat 72 are rotatably connected by a bearing. The connecting seat 72 and the limiting block 73 are rotatably connected by a torsion spring. The width of the limiting block 73 is the same as the width of the rectangular groove 6, so that the limiting block 73 can be completely inserted into the rectangular groove 6, thereby making the locking assembly less prone to wobbling left and right. Both ends of the limiting block 73 are fixedly connected with elastic pads 74, which reduces the possibility that the limiting assembly cannot be accurately inserted into the rectangular groove 6 and lock the clamping assembly due to the different thicknesses of the connected parts.

[0027] Figure 6 As shown, when not in operation, the included angle between the connecting seat 72 and the limiting block 73 is 70°-90°. When in operation, the included angle between the connecting seat 72 and the limiting block 73 is 90°. Under the torque of the torsion spring 2, the limiting block 73 is not easily ejected from the rectangular groove 6.

[0028] Compared with the first embodiment, an annular groove 5, a rectangular groove 6, and a locking assembly are provided on the outer wall of the chuck 8. The locking assembly can rotate circumferentially along the annular groove 5. During the locking operation, the locking assembly is moved to both sides of the two clamping assemblies and then inserted into the rectangular groove 6 adjacent to the clamping assembly to further fix the clamping assembly and prevent it from driving the limiting disc 1 to rotate. At the same time, elastic washers 74 are fixedly connected to both sides of the locking assembly so that when the bolt and nut are locked to the connected parts of different thicknesses, the limiting block 73 can still be smoothly inserted into the rectangular groove 6, thereby improving the adaptability of the device to connected parts of different thicknesses and the anti-loosening effect of the device.

[0029] The above are merely preferred embodiments of this utility model, encompassing all protection scopes of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and improved concept of this utility model, should be covered within the protection scope of this utility model.

Claims

1. A bolt fastener anti-loosening structure, comprising a limiting disc (1), a chuck (8) located below the limiting disc (1), and two clamping assemblies fixedly connected to the outer end of the limiting disc (1), characterized in that: The bolt tail is provided with a square limiting groove (2) along the axial direction. The bolt is threaded with a nut. The limiting disc (1) is threaded on the outer wall of the bolt. The chuck (8) is sleeved on the outside of the bolt. The limiting disc (1) is located below the nut and abuts against the nut. The center of the chuck (8) is fixedly connected with a protrusion (3) along the axis. The width of the protrusion (3) is the same as the width of the limiting groove (2). The two clamping components are symmetrical about the central axis of the limiting disk (1). The clamping components include a fixed seat (41), a connecting block (42), a spring telescopic rod (43), and an L-shaped locking block (44). The fixed seat (41) is fixedly connected to the outer wall of the limiting disk (1). The fixed seat (41) and the connecting block (42) are rotatably connected by a torsion spring. The spring telescopic rod (43) is fixedly connected between the connecting block (42) and the L-shaped locking block (44). The upper end of the horizontal section of the L-shaped locking block (44) abuts against the lower end face of the chuck (8).

2. The anti-loosening structure for bolt fasteners according to claim 1, characterized in that: The inner wall of the vertical section of the L-shaped card block (44) is arc-shaped, and the inner wall of the vertical section of the L-shaped card block (44) is in contact with the outer wall of the chuck (8).

3. The anti-loosening structure for bolt fasteners according to claim 1, characterized in that: When not in operation, the horizontal angle between the fixed seat (41) and the spring telescopic rod (43) is between 60° and 80°, and the thickness of the chuck (8) is greater than the distance between the horizontal section of the fixed seat (41) and the L-shaped chuck block (44).

4. The anti-loosening structure for bolt fasteners according to claim 1, characterized in that: The outer wall of the chuck (8) is provided with an annular groove (5), and a limiting component is provided in the annular groove (5). The outer wall of the chuck (8) is provided with a plurality of rectangular grooves (6) evenly distributed around it, and the plurality of rectangular grooves (6) are all located below the annular groove (5).

5. The anti-loosening structure for bolt fasteners according to claim 4, characterized in that: The limiting component includes a slider (71), a connecting seat (72), and a limiting block (73). The slider (71) is slidably connected inside the annular groove (5). The slider (71) and the connecting seat (72) are rotatably connected by a bearing. The connecting seat (72) and the limiting block (73) are rotatably connected by a torsion spring. The width of the limiting block (73) is the same as the width of the rectangular groove (6). Both ends of the limiting block (73) are fixedly connected with elastic pads (74).

6. The anti-loosening structure for bolt fasteners according to claim 5, characterized in that: When not in operation, the angle between the connecting seat (72) and the limiting block (73) is 70°-90°. When in operation, the angle between the connecting seat (72) and the limiting block (73) is 90°.

Images