Anti-loosening self-locking type fastening bolt

Abstract

The utility model belongs to the technical field of fasteners, and particularly relates to an anti-loosening self-locking type fastening bolt which comprises a bolt body, a reducing nut, a slotted nut and a tensioning nut, the reducing nut and the slotted nut are sequentially arranged on the bolt body in a sleeved mode, and the tensioning nut is arranged on the reducing nut. The bolt comprises a nut and a screw rod, and a cross groove is formed in the screw rod in the axial direction of the screw rod. A plurality of notches are formed in one end of the slotted nut, the notches are uniformly distributed around the circle center of the slotted nut, and a plurality of tooth blocks are formed among the notches; a tensioning cone is arranged at one end of the tensioning nut, a conical groove is formed in the end face of the side, provided with the tensioning cone, of the tensioning nut, the tensioning cone can be inserted into the cross-shaped groove, and the tooth block can be sleeved with the conical groove. The fastening bolt provided by the utility model meets the connection requirements of high vibration and high strength, effectively resists impact load and alternating load, and prevents the bolt fastener from loosening or falling off under the conditions of strong vibration and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fastener, especially relates to a self-locking fastening bolt of anti-loosening. BACKGROUND

[0002] The bolt is a cylindrical fastener with a nut, which is composed of a head and a screw rod (a cylinder with external threads), and is used for fastening two parts with through holes. The self-locking bolt is particularly suitable for industries that do not allow the nut to loosen and fall off, such as construction machinery and mining machinery. In these industries, the bolt may loosen or fall off due to vibration and other reasons, which may cause serious safety accidents.

[0003] Currently, to prevent the bolt from loosening and falling off, a spring washer or double-nut locking method is usually used. However, these methods are not suitable for high-vibration and high-strength equipment. The structure of the self-locking bolt with a common self-locking nut is relatively weak, and the locking part may fail, which cannot meet the requirements of some harsh working conditions.

[0004] Therefore, the above problems need to be solved urgently. INVENTION CONTENT

[0005] The utility model discloses a self-locking fastening bolt of anti-loosening to overcome the above-mentioned defects and meet the requirements of stable connection under high strength and high vibration.

[0006] Technical scheme: In order to achieve the above-mentioned purpose, the utility model provides a self-locking fastening bolt of anti-loosening, which comprises a bolt, a variable-diameter nut, a slotted nut and a tension nut, the variable-diameter nut and the slotted nut are sequentially sleeved on the bolt, and the tension nut is arranged on the variable-diameter nut.

[0007] The bolt comprises a nut and a screw rod, and a cross groove is formed in the screw rod along the axial direction.

[0008] One end of the slotted nut is provided with a plurality of notches, the notches are uniformly distributed around the center of the slotted nut, and a plurality of tooth blocks are formed between the notches.

[0009] One end of the tension nut is provided with a tension cone, a conical groove is formed in the end face of the side provided with the tension cone, the tension cone can be inserted into the cross groove, and the conical groove can be sleeved on the tooth block.

[0010] Further, a sawtooth flange is arranged between the screw rod and the nut, the end face of the side close to the screw rod of the sawtooth flange is provided with sawteeth, and a boronized layer is arranged on the sawteeth.

[0011] Further, the tooth direction of the sawtooth is opposite to the thread direction on the screw rod.

[0012] Further, the screw rod is provided with external threads, the inner wall of the variable-diameter nut and the slotted nut is provided with internal threads, and the outer wall of the tension nut is provided with external threads.

[0013] Further, the left side of the variable-diameter nut is a small-diameter threaded hole, the right side is a large-diameter hole, the large-diameter hole is provided with internal threads near one side of the small-diameter threaded hole, the small-diameter threaded hole is matched with the screw rod threads, the large-diameter hole is matched with the tension nut threads, and the slotted nut is matched with the screw rod threads.

[0014] Further, the slotted nut is an outer hexagonal nut, and the tension nut is further provided with an inner hexagonal sleeve, which is located at the front end of the conical groove.

[0015] Further, the side top surface of the tooth block is an arc surface, the hardness of the slotted nut is lower than that of the tension nut and the slotted nut is elastic.

[0016] The above technical scheme can be seen, and the utility model has the following beneficial effects:

[0017] 1. The utility model provides a kind of anti-loose self-locking fastening bolt, design variable-diameter nut, slotted nut and tension nut, make slotted nut and bolt realize self-locking by tension nut, then realize locking anti-loose by slotted nut and variable-diameter nut cooperation, so that variable-diameter nut can be firmly matched with bolt, this structure can resist high-strength vibration, effectively resist impact load and alternating load, prevent bolt fastener loosening or falling off under intense vibration etc., ensure the reliability of connection.

[0018] 2. Sawtooth flange is designed on bolt, sawtooth on sawtooth flange can effectively prevent bolt from rotating in loosening direction, and boronizing layer on sawtooth can avoid sawtooth scratching connecting surface during bolt connection and corroding to affect overall connection strength. DRAWINGS

[0019] Figure 1 It is a schematic diagram of the anti-loose self-locking fastening bolt of the utility model;

[0020] Figure 2 It is a top view of the bolt of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the slotted nut of the utility model;

[0022] Figure 4 It is a top view of the tension nut of the utility model.

[0023] In the diagram: 1-bolt, 11-nut, 12-screw, 121-cross groove, 13-serrated flange, 2-reducing nut, 3-slotted nut, 31-tooth block, 4-tensioning nut, 41-tensioning cone, 42-tapered groove, 43-internal hex socket. Detailed Implementation

[0024] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] like Figures 1-4 As shown: A self-locking anti-loosening fastening bolt includes a bolt 1, a reducing nut 2, a slotted nut 3, and a tension nut 4. The reducing nut 2 and the slotted nut 3 are sequentially sleeved on the bolt 1, and the tension nut 4 is disposed on the reducing nut 2.

[0026] The bolt 1 includes a nut 11 and a screw 12, and the screw 12 has a cross groove 121 along its axial direction;

[0027] The slotted nut 3 has multiple slots at one end, which are evenly distributed around the center of the slotted nut 3, and multiple tooth blocks 31 are formed between the slots.

[0028] One end of the tensioning nut 4 is provided with a tensioning cone 41, and a conical groove 42 is provided on one side end face of the tensioning cone 41. The tensioning cone 41 can be inserted into the cross groove 121, and the conical groove 42 can be sleeved on the tooth block 31.

[0029] In this embodiment, the tensioning cone 41 is inserted into the cross groove 121 to push the screw 12, which is divided into four parts, outward, so that its outer diameter expands to better fit with the internal thread of the nut. The conical groove 42 can make the tooth block 31 move closer to the center, thereby realizing the self-locking of the slotted nut 3 and the screw 12. The slotted nut 31 plays an effective role in preventing loosening and preventing the variable diameter nut 2 from slipping.

[0030] like Figure 1 , Figure 2 A serrated flange 13 is also provided between the screw 12 and the nut 11. The end face of the serrated flange 13 near the screw 12 has serrations, and the serrations have a boron-impregnated layer. The direction of the serrations is opposite to the direction of the thread on the screw 12. As the nut on the bolt 1 is tightened, the axial force increases, and the pressure between the serrated flange 13 and the connecting surface increases. The boron-impregnated layer on the serrations is squeezed and covers the connecting surface, playing a role in corrosion prevention. At the same time, the serrations can prevent the bolt 1 from rotating slightly during vibration.

[0031] The outer thread is arranged on the screw rod 12 in length, the inner wall of the variable-diameter nut 2 and the slotted nut 3 is provided with an inner thread, the outer wall of the tension nut 4 is provided with an outer thread, the left side of the variable-diameter nut 2 is a small-diameter threaded hole, the right side is a large-diameter hole, the large-diameter hole is provided with an inner thread near the side close to the small-diameter threaded hole, the small-diameter threaded hole is screwed with the screw rod 12, the large-diameter hole is screwed with the tension nut 4, and the slotted nut 3 is screwed with the screw rod 12.

[0032] As Figure 1 , 3 , 4, the slotted nut 3 is an outer hexagonal nut, the upper portion of the tension nut 4 is further provided with an inner hexagonal sleeve 43, and the inner hexagonal sleeve 43 is located at the front end of the conical groove 42. Since the slotted nut 3 is located inside the tension nut 4, it is inconvenient to rotate the slotted nut 3, and a special tool needs to be designed again. The inner hexagonal sleeve 43 is designed on the tension nut 4 to rotate the slotted nut 3. When the slotted nut 3 is screwed into place, since the left side of the large-diameter hole of the variable-diameter nut 2 is not provided with a thread, the inner hexagonal sleeve 43 is separated from the outer hexagonal nut on the slotted nut 3 by applying a leftward force to the tension nut 4. In this way, the outer thread on the tension nut 4 can be matched with the inner thread on the left side of the large-diameter hole of the variable-diameter nut 2, and the tension nut 4 can continue to be screwed in without affecting the slotted nut 3.

[0033] Further, the side top surface of the tooth block 31 is an arc surface, and the hardness of the slotted nut 3 is lower than that of the tension nut 4 and has elasticity. The side top surface of the tooth block 31 is an arc surface, which is more convenient to be clamped into the conical groove 42. The tooth block 31 on the slotted nut 3 is deformed and close to each other under the action of the conical groove 42, but it will not be broken.

[0034] In use, first, the small-diameter end of the variable-diameter nut 2 is screwed into the screw rod 12, then the slotted nut 3 is sleeved on the inner hexagonal sleeve 43 of the tension nut 4, the tension nut 4 is screwed into the variable-diameter nut 2, the slotted nut 3 is screwed on the screw rod 12 by rotating the tension nut 4, when the end surface of the slotted nut 3 contacts the variable-diameter end surface of the variable-diameter nut 2 and reaches the torque limit, the inner hexagonal sleeve 43 is separated from the outer hexagonal nut on the slotted nut 3 by pressing the tension nut 4, the tooth block 31 is clamped into the conical groove 42, at this time, the outer thread of the tension nut 4 can be matched with the inner thread of the variable-diameter nut 2, the tension nut 4 is continuously rotated, the tension cone 41 is clamped into the cross groove 121, the conical groove 42 presses the tooth block 31 to close to the center, and the outer thread on the screw rod 12 is tightly matched with the inner thread on the tooth block 31.

[0035] The preferred embodiments of the utility model are described above, it should be pointed out that, for ordinary technical personnel in the prior art, on the premise of not departing from the principle of the utility model, a number of improvements can be made, these improvements also should be regarded as the protection scope of the utility model.

Claims

1. A self-locking fastening bolt, characterized by comprising: It comprises a bolt (1), a variable-diameter nut (2), a slotted nut (3) and a tension nut (4), the variable-diameter nut (2) and the slotted nut (3) are sequentially sleeved on the bolt (1), and the tension nut (4) is arranged on the variable-diameter nut (2); The bolt (1) comprises a nut (11) and a screw rod (12), and a cross slot (121) is formed in the screw rod (12) in the axial direction; One end of the slotted nut (3) is provided with a plurality of notches, the notches are uniformly distributed around the center of the slotted nut (3), and a plurality of tooth blocks (31) are formed between the notches; One end of the tension nut (4) is provided with a tension cone (41), a tapered slot (42) is formed on the side end face provided with the tension cone (41), the tension cone (41) can be inserted into the cross slot (121), and the tapered slot (42) can be sleeved on the tooth block (31).

2. A self-locking fastening bolt according to claim 1, wherein A sawtooth flange (13) is further arranged between the screw rod (12) and the nut (11), the sawtooth flange (13) is provided with a sawtooth on the end face close to the screw rod (12), and the sawtooth is provided with a boronized layer.

3. A self-locking fastening bolt according to claim 2, wherein The tooth direction of the sawtooth is opposite to the rotation direction of the thread on the screw rod (12).

4. The self-locking fastening bolt according to claim 1, wherein An external thread is arranged on the screw rod (12) in the length direction, the inner wall of the variable-diameter nut (2) and the slotted nut (3) is provided with an internal thread, and the outer wall of the tension nut (4) is provided with an external thread.

5. A self-locking fastening bolt according to claim 4, wherein The left side of the variable-diameter nut (2) is a small-diameter threaded hole, the right side is a large-diameter hole, the inner wall of the large-diameter hole close to the small-diameter threaded hole is provided with an internal thread, the small-diameter threaded hole is threadedly connected with the screw rod (12), the large-diameter hole is threadedly connected with the tension nut (4), and the slotted nut (3) is threadedly connected with the screw rod (12).

6. The self-locking fastening bolt of claim 1, wherein The slotted nut (3) is an outer hexagonal nut, the tension nut (4) is further provided with an inner hexagonal sleeve (43), and the inner hexagonal sleeve (43) is located at the front end of the tapered slot (42).

7. The self-locking fastening bolt according to claim 1, wherein The side top surface of the tooth block (31) is an arc surface, the hardness of the slotted nut (3) is lower than that of the tension nut (4) and has elasticity.

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