Lock bolt connecting pair

Abstract

The utility model discloses a lock bolt connecting pair which comprises a slotted bolt, a slotted nut and a lock pin. The slotted bolt is provided with more than one slot II along the axial direction along the outer circumference, and one end of each slot II extends to the end part of the rod part of the slotted bolt; the slotted nut is provided with more than one slot I along the axial direction along the inner circumference, and all the slots I extend to the same end of the slotted nut; the slotted bolt is in threaded fit with the slotted nut, during fastening, at least one slot II and one slot I are opposite in the radial direction and are communicated to form a cylindrical hole, and the axis direction of the cylindrical hole is parallel to the axis of the slotted bolt; the anti-loosing nut is arranged in the cylindrical hole in the axial direction, the rotation of the slotted nut relative to the slotted bolt is limited, and the anti-loosing nut is convenient to mount and dismount and high in anti-loosing capacity.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to an anti-loosening bolt connection pair. Background Art

[0002] Bolted connections are threaded structure connections commonly used in engineering construction and mechanical equipment. Ordinary bolted connections are used in a complex environment and are often affected by uncontrollable external environmental vibrations or the vibrations of the mechanical equipment itself, causing the threaded part of the connection to loosen. The loose threads will become looser in a vibrating environment until the threads lose their tightening effect, are subjected to shear stress, and break.

[0003] Traditional bolted joints are mainly prevented from loosening by using spring washers, regular testing and applying torque. However, spring washers themselves have risks such as expansion and hydrogen embrittlement, and repeated application of torque can easily cause thread failure of spring washers, so there are still safety hazards to varying degrees. Utility Model Content

[0004] In view of this, the utility model provides an anti-loosening bolt connection pair, which is convenient to install and disassemble and has strong anti-loosening ability.

[0005] The utility model is realized by the following technical solutions:

[0006] An anti-loosening bolt connection pair, comprising: a slotted bolt, a slotted nut and an anti-loosening pin;

[0007] The slotted bolt is provided with more than one axial slot II along the outer circumference, and one end of each slot II extends to the end of the shank of the slotted bolt;

[0008] The slotted nut is provided with one or more slots I along the axial direction along the inner circumference, and all the slots I extend to the same end of the slotted nut;

[0009] The slotted bolt and the slotted nut are threadedly matched. When tightened, at least one slot II is radially opposite to the slot I and connected to form a cylindrical hole. The axial direction of the cylindrical hole is parallel to the axial direction of the slotted bolt.

[0010] The anti-loosening pin is axially arranged in the cylindrical hole to limit the rotation of the slotted nut relative to the slotted bolt.

[0011] Beneficial effects:

[0012] (1) The utility model provides an anti-loosening bolt connection pair, wherein the slotted bolt is provided with a slot II, and the slotted nut is provided with a slot I. When tightened, the slot II and the slot I are opposite to each other and connected to form a cylindrical hole, and the anti-loosening pin is axially located in the cylindrical hole, which is convenient for installation and disassembly and has a strong anti-loosening ability.

[0013] (2) The utility model utilizes the principle of a vernier caliper. When the slotted bolt and the slotted nut are tightened, the number of slots I of the slotted nut is one more than the number of slots II. This enables at least one slot I of the slotted bolt to be aligned with slot II. It is not necessary to align all slots I with slots II, making it easier to insert the anti-loosening pin into the connected cylindrical hole to complete the installation.

[0014] (3) The anti-loosening pin in the utility model is interference fit with the cylindrical hole. Since the anti-loosening pin has tension, it will tightly clamp the slotted bolt and slotted nut connection pair, so that the threads of the slotted bolt and slotted nut will not loosen in a vibration environment.

[0015] (4) The axial length of the anti-loosening pin of the utility model is greater than the axial length of the cylindrical hole, which facilitates the subsequent removal of the anti-loosening pin and further facilitates the removal of the slotted nut.

[0016] (5) The slot I of the slotted nut of the utility model is an axial through slot, which is easy to process and does not need to distinguish the direction during installation, so it is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation of the anti-loosening bolt connection pair of the utility model (side view);

[0018] Figure 2 This is a connection schematic diagram of the anti-loosening bolt connection pair of the utility model (top view);

[0019] Figure 3 It is a schematic diagram of the slotted nut of the utility model;

[0020] Figure 4 It is a schematic diagram of the slotted nut of the utility model;

[0021] Figure 5 This is a schematic diagram of the connection between the slotted bolt and the slotted nut of the utility model;

[0022] Figure 6 Schematic diagram of the anti-loosening pin of the utility model, wherein (a) is a front view and (b) is a side view;

[0023] Among them, 1-slotted bolt, 2-slotted nut, 3-anti-loosening pin, 4-fastened part 1, 5-fastened part II, 6-slot I, 7-slot II, 8-opening. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0025] This embodiment provides a loose-proof bolt connection pair, see attached Figure 1 and 2, comprising: a slotted bolt 1, a slotted nut 2 and a locking pin 3;

[0026] The slotted bolt 1 is provided with one or more slots II7 along the axial direction along the outer circumference, and one end of each slot II7 extends to the end of the rod of the slotted bolt 1;

[0027] The slotted nut 2 is provided with one or more slots Ⅰ6 along the axial direction along the inner circumference, and all the slots Ⅰ6 extend to the same end of the slotted nut 2;

[0028] The slotted bolt 1 and the slotted nut 2 are threadedly matched. When tightened, at least one slot II 7 and the slot I 6 are radially opposite and connected to form a cylindrical hole. The axial direction of the cylindrical hole is parallel to the axial direction of the slotted bolt 1.

[0029] The anti-loosening pin 3 is axially arranged in the cylindrical hole to limit the rotation of the slotted nut 2 relative to the slotted bolt 1, thereby achieving the anti-loosening effect.

[0030] The present embodiment provides an anti-loosening bolt connection pair, in which the slotted bolt 1 is provided with a slot II 7, and the slotted nut 2 is provided with a slot I6. When tightened, the slot II 7 and the slot I6 are opposite to each other and connected to form a cylindrical hole, and the anti-loosening pin 3 is axially located in the cylindrical hole, which is convenient for installation and disassembly and has a strong anti-loosening ability.

[0031] The number of slots II7 of the slotted bolt 1 is N (N is greater than or equal to I, and N is an integer), such as 1, 2, 3, 4, 5, 6, 7, 8, 9; the number of slots I6 of the slotted nut is N+1; in a specific embodiment, the number of slots II7 of the slotted bolt 1 is six, and the number of slots I6 of the slotted nut 2 is seven; the slots II7 are evenly distributed along the outer circumference of the slotted bolt 1; the slots I6 are evenly distributed along the inner circumference of the slotted nut; the slot I6 can be an axial through slot;

[0032] This embodiment uses the principle of a vernier caliper. When the slotted bolt 1 and the slotted nut 2 are tightened, the number of slots Ⅰ6 of the slotted nut is one more than the number of slots Ⅱ7. This allows at least one slot Ⅰ6 of the slotted bolt 1 to be opposite to slot Ⅱ7. There is no need to align all slots Ⅰ6 with slots Ⅱ, which makes it easier to insert the anti-loosening pin 3 into the connected cylindrical hole to complete the installation.

[0033] In a specific embodiment, see the attached Figure 4 , the slot II7 of the slotted bolt 1 is a semicircular slot, and the slot I6 of the slotted nut is an arc-shaped slot;

[0034] In another specific embodiment, the slot II7 of the slotted bolt 1 may be a superior arc-shaped slot, and the slot I6 of the slotted nut 2 may be a semicircular slot;

[0035] See attached Figure 6The anti-loosening pin 3 is a circular tube structure, and an axial opening 8 is provided along the outer wall of the circular tube structure; the anti-loosening pin 3 is made of spring steel; the anti-loosening pin 3 is interference fit with the cylindrical hole;

[0036] In this embodiment, the anti-loosening pin 3 is interference fit with the cylindrical hole. Since the anti-loosening pin 3 has tension, it will tightly clamp the connection pair of the slotted bolt 1 and the slotted nut 2, so that the threads of the slotted bolt 1 and the slotted nut 2 will not loosen under a vibration environment.

[0037] In a specific embodiment, the axial length of the anti-loosening pin 3 is greater than the axial length of the cylindrical hole, which facilitates the subsequent removal of the anti-loosening pin 3 and further facilitates the disassembly of the slotted nut 2.

[0038] The slotted bolt 1 and the slotted nut 2 are both made of heat-treated high-strength carbon steel;

[0039] Working principle:

[0040] After fastening the fastener 14 and the fastener II5 by threaded connection using the slotted bolt 1 and the slotted nut 2, adjust the slotted nut 2 and the slotted bolt 1 so that a slot II7 on the slotted bolt 1 is connected with a slot I6 on the slotted nut 2 to form a cylindrical hole; pinch the anti-loosening pin 3 and insert it into the cylindrical hole, release the anti-loosening pin 3, and the anti-loosening pin 3 will have an interference fit with the cylindrical hole under the action of elastic force, thereby tightly clamping the connection pair of the slotted bolt 1 and the slotted nut 2, so that the threads of the slotted bolt 1 and the slotted nut 2 will not loosen under a vibration environment.

[0041] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A loose-proof bolt connection pair, characterized in that: include: slotted bolts, slotted nuts and locking pins; The slotted bolt is provided with more than one axial slot II along the outer circumference, and one end of each slot II extends to the end of the shank of the slotted bolt; The slotted nut is provided with one or more slots I along the axial direction along the inner circumference, and all the slots I extend to the same end of the slotted nut; The slotted bolt and the slotted nut are threadedly matched. When tightened, at least one slot II is radially opposite to the slot I and connected to form a cylindrical hole. The axial direction of the cylindrical hole is parallel to the axial direction of the slotted bolt. The anti-loosening pin is axially arranged in the cylindrical hole to limit the rotation of the slotted nut relative to the slotted bolt.

2. The anti-loosening bolt connection pair according to claim 1, characterized in that: The number of slots II of the slotted bolt is N, and the number of slots I of the slotted nut is N+1; Wherein, N is greater than or equal to Ⅰ, and N is an integer.

3. The anti-loosening bolt connection pair according to claim 2, characterized in that: The number of slots II of the slotted bolt is six, and the number of slots I of the slotted nut is seven.

4. The anti-loosening bolt connection pair according to claim 1, characterized in that: Slots II are evenly distributed along the outer circumference of the slotted bolt; slots I are evenly distributed along the inner circumference of the slotted nut.

5. The anti-loosening bolt connection pair according to claim 1, characterized in that: The slot II of the slotted bolt is a semicircular slot, and the slot I of the slotted nut is an arc-shaped slot.

6. The anti-loosening bolt connection pair according to claim 1, characterized in that: The slot II of the slotted bolt is an arc-shaped slot, and the slot I of the slotted nut is a semicircular groove.

7. An anti-loosening bolt connection pair according to any one of claims 1 to 6, characterized in that: The anti-loosening pin is a circular tube structure, and an axial opening is arranged along the outer wall surface of the circular tube structure; the material of the anti-loosening pin is spring steel; the anti-loosening pin is interference fit with the cylindrical hole.

8. The anti-loosening bolt connection pair according to any one of claims 1 to 6, characterized in that: The axial length of the anti-loosening pin is greater than the axial length of the cylindrical hole.

9. The anti-loosening bolt connection pair according to any one of claims 1 to 6, characterized in that: Slot I is an axial through slot.

Images