Anti-loosening pre-tightening assembly of high-strength sectional type bolt

Abstract

The utility model discloses an anti-loosing pre-tightening assembly of a high-strength sectional type bolt, which is applied to the technical field of fastening connection, when a bolt on one side is tightened, a bolt on the other side is synchronously and reversely screwed in, so that the automatic balanced transmission of pre-tightening force on two sides is realized, the structure not only simplifies the operation process of bidirectional synchronous fastening, but also reduces the labor intensity of workers. The mechanical interlocking effect of reverse threads can be utilized, self-balancing constraint is formed under vibration or impact, overall pre-tightening force attenuation caused by single-side loosening is avoided, meanwhile, the requirement for manual repeated adjustment is reduced, and the assembly efficiency and the anti-loosening reliability are improved; the inclined plane meshing structures of the wedge-shaped locking washers on the two sides of the threaded cylinder automatically generate radial expansion force when the bolt is pre-tightened, so that the sawteeth of the washers, the threaded cylinder and the surface of a connected piece form multidirectional mechanical interlocking, and the bidirectional wedge-shaped structure can continuously compensate for pre-tightening force attenuation through the inclined plane self-tightening effect under vibration or impact.

Description

Technical Field

[0001] This utility model belongs to the field of fastening and connection technology, and specifically relates to a pre-tightening component for preventing loosening of high-strength segmented bolts. Background Technology

[0002] Bolts made of high-strength steel or requiring a large preload can be called high-strength bolts. High-strength bolts are mostly used for connections in bridges, rails, and high-voltage and ultra-high-voltage equipment. The fracture of these bolts is mostly brittle fracture. High-strength bolts used in ultra-high-voltage equipment require a large preload to ensure the sealing of the container. However, traditional high-strength segmented bolts require each side to be tightened independently, which easily leads to uneven distribution of preload and low operating efficiency. Under vibration, when the thread on one side is subjected to dynamic load, the loosening direction is consistent, the preload decay rate is accelerated, increasing the risk of assembly errors and maintenance costs. In addition, the anti-loosening ability relies entirely on the single friction force of the thread, which is easily affected by factors such as material wear and temperature changes, and it is difficult to block the linear transmission of the loosening trend. In order to solve the problems mentioned above, we propose an anti-loosening preload component for high-strength segmented bolts. Utility Model Content

[0003] The purpose of this utility model is to provide a pre-tightening assembly for preventing loosening of high-strength segmented bolts, which has the advantages of bidirectional synchronous tightening and anti-loosening structure.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-strength segmented bolt anti-loosening pre-tightening component, including a sleeve, a threaded cylinder rotatably connected inside the sleeve, cylinder openings welded on both sides of the sleeve, internal threads provided on both sides of the inner wall of the threaded cylinder and the inner wall of the cylinder opening, and an anti-loosening mechanism provided on the opposite sides of the two cylinder openings.

[0005] The above technical solution involves inserting two bolts into the openings of the cylinder on both sides. Tightening one bolt causes the threaded cylinder to rotate, and the internal threads inside the threaded cylinder are set in opposite directions. The rotation of the threaded cylinder causes the bolt on the other side to rotate and tighten. When one bolt is tightened, the other bolt is simultaneously screwed in in the opposite direction, realizing the automatic and balanced transmission of preload on both sides. This structure not only simplifies the operation process of bidirectional synchronous tightening, but also utilizes the mechanical interlocking effect of the reverse threads to form a self-balancing constraint under vibration or impact, avoiding the overall preload attenuation caused by loosening on one side. At the same time, it reduces the need for repeated manual adjustments, improving assembly efficiency and anti-loosening reliability.

[0006] The present invention is further configured such that the anti-loosening mechanism includes a washer A, the washer A is located on the side opposite to the cylinder opening, the side of the washer A away from the cylinder opening is provided with a washer B, a small inclined surface is provided on the side of the washer A and the side of the washer B away from the washer A is provided with a nut.

[0007] The above technical solution employs an anti-loosening mechanism. Bolts on both sides are inserted into the threaded holes of the nuts, and then into the holes for washers A and B. The corresponding cylinder openings are then inserted, and one side of the bolt is tightened. The small bevel engages with the nut and cylinder opening, increasing friction. The large bevels between washers A and B interlock. The wedge-shaped locking washers on both sides of the threaded cylinder automatically generate radial expansion force when the bolts are pre-tightened, causing the washer teeth to form a multi-directional mechanical interlock with the threaded cylinder and the surfaces of the connected parts. This bidirectional wedge structure not only continuously compensates for pre-tightening force attenuation under vibration or impact through the bevel's self-tightening effect, but also utilizes the misaligned engagement of the teeth to prevent the threaded pair from loosening. Simultaneously, it simplifies the repeated adjustment steps required by traditional anti-loosening components, significantly improving assembly efficiency and dynamic load stability.

[0008] The present invention is further configured such that the internal threads on both sides of the inner wall of the threaded cylinder are configured in opposite directions.

[0009] The above technical solution allows for tightening of bolts on one side while simultaneously tightening bolts on the other side by setting opposite directions.

[0010] The present invention is further configured such that the internal thread on the inner wall of the cylinder opening is aligned with the direction of the internal thread on the same side of the cylinder opening.

[0011] By adopting the above technical solution, the direction is consistent, so that it will not be affected when tightening bolts.

[0012] The present invention is further configured such that the shape of the opposite side of the washer A and washer B located on one side is a large inclined surface.

[0013] By adopting the above technical solution, by setting it to a large inclined plane, washer A and washer B can be locked together.

[0014] The present invention is further configured such that holes are provided through the centers of both sides of washer A and washer B.

[0015] The above technical solution allows for the insertion of bolts by creating holes.

[0016] The present invention is further configured such that threaded holes are provided through the centers of both sides of the nut.

[0017] The above technical solution allows for the insertion of bolts by providing threaded holes.

[0018] The present invention is further provided that the surface of the sleeve is provided with an anti-slip coating.

[0019] By adopting the above technical solution, the surface wear can be reduced and the service life can be extended by setting an anti-slip coating.

[0020] In summary, this utility model has the following beneficial effects:

[0021] 1. This utility model achieves automatic balanced transmission of preload on both sides by simultaneously screwing in the bolt on the other side in the opposite direction when tightening the bolt on one side. This structure not only simplifies the operation process of bidirectional synchronous tightening, but also utilizes the mechanical interlocking effect of the reverse thread to form a self-balancing constraint under vibration or impact, avoiding the overall preload attenuation caused by loosening on one side. At the same time, it reduces the need for repeated manual adjustments, improves assembly efficiency and anti-loosening reliability.

[0022] 2. This utility model utilizes the inclined interlocking structure of the wedge-shaped locking washers on both sides of the threaded cylinder to automatically generate radial expansion force when the bolt is pre-tightened. This causes the washer teeth to form a multi-directional mechanical interlock with the surface of the threaded cylinder and the connected parts. This bidirectional wedge structure can not only continuously compensate for the pre-tightening force attenuation under vibration or impact through the inclined self-tightening effect, but also use the misaligned interlocking of the teeth to block the tendency of the threaded pair to loosen. At the same time, it simplifies the repeated adjustment steps required by traditional anti-loosening components, significantly improving assembly efficiency and dynamic load stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0025] Figure 3 This is a partial structural side view of the present invention.

[0026] Reference numerals in the attached diagram: 1. Sleeve; 2. Threaded sleeve; 3. Sleeve opening; 4. Internal thread; 5. Washer A; 6. Washer B; 7. Small bevel; 8. Nut; 9. Hole; 10. Threaded hole. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1:

[0029] refer to Figure 1 , Figure 2A high-strength segmented bolt anti-loosening pre-tightening assembly includes a sleeve 1, a threaded cylinder 2 rotatably connected inside the sleeve 1, and cylinder openings 3 welded to both sides of the sleeve 1. Internal threads 4 are formed on both sides of the inner wall of the threaded cylinder 2 and the inner wall of the cylinder opening 3. Anti-loosening mechanisms are provided on opposite sides of the two cylinder openings 3. Two bolt segments are inserted into the cylinder openings 3 on both sides respectively. Tightening one side of the bolt causes the threaded cylinder 2 to rotate. The internal threads 4 inside the threaded cylinder 2 are set in opposite directions. The rotation of the threaded cylinder 2 causes the bolt on the other side to rotate and tighten. When the bolt on one side is tightened, the bolt on the other side is simultaneously screwed in in the opposite direction, realizing the automatic balanced transmission of pre-tightening force on both sides. This structure not only simplifies the operation process of bidirectional synchronous tightening.

[0030] refer to Figure 2 The internal threads 4 on both sides of the inner wall of the threaded cylinder 2 are set in opposite directions. By setting the opposite directions, the bolts on the other side can be tightened while the bolts on one side are tightened.

[0031] refer to Figure 2 The internal thread 4 on the inner wall of the cylinder opening 3 is set to be in the same direction as the internal thread 4 on the same side of the cylinder opening 3. By setting the direction to be consistent, it can be unaffected when tightening the bolt.

[0032] refer to Figure 1 The surface of sleeve 1 is coated with an anti-slip layer, which reduces surface wear and extends service life.

[0033] Brief description of the usage process: After the bolts and anti-loosening pre-tightening components are assembled, the two bolts are inserted into the two cylinder openings 3 on both sides respectively. Tighten the bolt on one side, and the bolt rotation will drive the threaded cylinder 2 to rotate. The internal thread 4 inside the threaded cylinder 2 is set in the opposite direction. The rotation of the threaded cylinder 2 will drive the bolt on the other side to rotate and tighten. When the bolt on one side is tightened, the bolt on the other side is simultaneously screwed in in the opposite direction, realizing the automatic balanced transmission of pre-tightening force on both sides. This structure not only simplifies the operation process of bidirectional synchronous tightening, but also utilizes the mechanical interlocking effect of the reverse threads to form a self-balancing constraint under vibration or impact, avoiding the overall pre-tightening force attenuation caused by loosening on one side. At the same time, it reduces the need for manual repeated adjustment and improves assembly efficiency and anti-loosening reliability.

[0034] Example 2:

[0035] refer to Figure 1 , Figure 2 , Figure 3A high-strength segmented bolt anti-loosening pre-tightening assembly includes an anti-loosening mechanism comprising a washer A5 located on the opposite side of the cylinder opening 3, and a washer B6 located on the side of the washer A5 away from the cylinder opening 3. A small inclined surface 7 is provided on the opposite side of the washer A5 and washer B6 on one side, and a nut 8 is provided on the side of the washer B6 away from the washer A5. Bolts on both sides are inserted into the threaded holes 10 in the nuts 8, and then into the holes 9 of the washer A5 and washer B6, and then into the corresponding cylinder opening 3. The bolts on one side are tightened. The small inclined surface 7 engages with the nut 8 and the cylinder opening 3 to increase friction. The large inclined surface shapes between the washer A5 and washer B6 engage with each other to form an interlock. The inclined surface engagement structure of the wedge-shaped locking washers on both sides of the threaded cylinder 2 automatically generates radial expansion force when the bolt is pre-tightened, so that the washer teeth form a multi-directional mechanical interlock with the surface of the threaded cylinder 2 and the connected parts.

[0036] refer to Figure 2 The shape of the opposite side of washer A5 and washer B6 is set as a large bevel. By setting it as a large bevel, washer A5 and washer B6 can be locked together.

[0037] refer to Figure 3 Both washers A5 and B6 have holes 9 through their centers on both sides, through which bolts can be inserted.

[0038] refer to Figure 1 The nut 8 has threaded holes 10 through its center on both sides, through which bolts can be inserted.

[0039] Brief description of usage: When using high-strength segmented bolts and anti-loosening pre-tightening components for fixing, insert the bolts on both sides into the threaded holes 10 in the nuts 8, insert the holes 9 for washers A5 and B6, and then insert the corresponding cylinder openings 3. Tighten one side of the bolt. The small bevel 7 engages with the nuts 8 and cylinder openings 3 to increase friction. The large bevel shapes between washers A5 and B6 engage with each other to form an interlock. The bevel engagement structure of the wedge-shaped locking washers on both sides of the threaded cylinder 2 automatically generates radial expansion force when the bolt is pre-tightened, so that the washer teeth and the surface of the threaded cylinder 2 and the connected parts form a multi-directional mechanical interlock. This two-way wedge structure can not only continuously compensate for the pre-tightening force attenuation under vibration or impact through the bevel self-tightening effect, but also block the loosening trend of the threaded pair by utilizing the misaligned engagement of the teeth. At the same time, it simplifies the repeated adjustment steps required by traditional anti-loosening components, significantly improving assembly efficiency and dynamic load stability.

[0040] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A high-strength segmented bolt anti-loosening pre-tightening assembly comprising, characterized by: The utility model provides a sleeve (1) is characterized by: the inside rotation of sleeve (1) is connected with threaded cylinder (2), both sides of sleeve (1) are welded with cylinder mouth (3), both sides of the inner wall of threaded cylinder (2) and the inner wall of cylinder mouth (3) are provided with internal thread (4), and the opposite side of two cylinder mouth (3) is provided with anti-loosening mechanism.

2. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 1, characterized in that: The anti-loosening mechanism includes washer A (5), the washer A (5) is located in the opposite side of cylinder mouth (3), the opposite side of washer A (5) and washer B (6) is provided with small bevel (7) on one side, and the opposite side of washer B (6) away from washer A (5) is provided with nut (8).

3. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 1, characterized in that: The internal thread (4) of both sides of threaded cylinder (2) inner wall is set to opposite direction.

4. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 1, characterized in that: The internal thread (4) of the inner wall of cylinder mouth (3) is set to be consistent with the direction of the internal thread (4) of the same side cylinder mouth (3).

5. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 2, characterized in that: The shape of the opposite side of washer A (5) and washer B (6) is set to be large bevel.

6. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 2, characterized in that: The center of both sides of washer A (5) and washer B (6) is penetrated and provided with hole (9).

7. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 2, characterized in that: The center of both sides of nut (8) is penetrated and provided with threaded hole (10).

8. A high-strength segmented bolt anti-loosening pre-tightening assembly according to claim 1, characterized in that: The surface of sleeve (1) is provided with anti-skid layer paint.

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