CN220863904U

CN220863904U - Stud pre-tightening device

Info

Publication number: CN220863904U
Application number: CN202322503545.1U
Authority: CN
Inventors: 倪泽炎; 罗林; 陈苏杨; 张钰华; 张殷; 瞿宏春
Original assignee: Nantong Guoxuan New Energy Technology Co Ltd
Current assignee: Nantong Guoxuan New Energy Technology Co Ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-30
Anticipated expiration: 2033-09-15

Abstract

The utility model discloses a stud pre-tightening device, which comprises: a limiting block provided with a blind hole; the nut is arranged in the blind hole of the limiting block, can move along the axial direction of the blind hole and can not rotate circumferentially; the mounting plate is fixed at the front end part of the limiting block; a spring disposed in the blind hole of the stopper, the spring being restrained between the nut and the mounting plate; the final bolt sequentially passes through the mounting plate, the spring and is screwed into the thread of the nut. The utility model discloses utilize the cooperation of nut and stopper blind hole, make the screw in-process of bolt, the nut can not follow the screw in of bolt and rotate, but do rectilinear movement along the axial of blind hole, keep compressing tightly between reaction force messenger bolt head and the mounting panel that produces after the spring compression to under the condition that does not use spring spacer, can obviously reduce the bolt not hard up, drop or lose the phenomenon emergence, effectively maintain the fail safe nature of equipment.

Description

Stud pre-tightening device

Technical Field

The utility model relates to a pre-tightening device, in particular to a bolt pre-tightening device.

Background

The pretension of a fixed torque value between the fastener and the mounting surface is typically achieved in industrial production using a spring washer and torque wrench. However, for other working conditions, such as plum blossom handle bolts, butterfly bolts and the like, working conditions needing to be frequently and manually loosened exist, so that the plum blossom handle bolts and the butterfly bolts generally cannot be loose-proof by using spring gaskets, and the bolts are often loosened, fall off or are lost due to jolt, jolt and the like in the transportation process, and equipment damage and property damage can be caused in severe cases.

Disclosure of utility model

In order to solve the defects of the technology, the utility model provides a bolt pre-tightening device.

In order to solve the technical problems, the utility model adopts the following technical scheme: a stud pretension device comprises:

the limiting block is internally provided with a blind hole;

the nut is arranged in the blind hole of the limiting block, and can move along the axial direction of the blind hole but can not rotate circumferentially;

the mounting plate is fixed at the front end part of the limiting block;

The spring is arranged in the blind hole of the limiting block and is limited between the nut and the mounting plate;

The bolts sequentially penetrate through the mounting plate, the springs and are screwed into the threads of the nuts.

Further, the nut is a polygonal nut, and the blind hole of the limiting block is a polygonal hole matched with the nut in shape.

Further, the polygonal nut adopted by the nut is: hexagonal nuts or square nuts or other polygonal nuts.

Further, a round hole through which the bolt can pass is formed in the mounting plate.

Further, the mounting plate is welded or riveted with the limiting block.

Further, the length of the bolt is between the bolt mounting surface of the mounting plate and the distance between the front end face and the rear end face of the nut.

Further, when the length of the bolt exceeds the distance from the bolt mounting surface of the mounting plate to the rear end face of the nut, a round hole corresponding to the diameter of the bolt is formed in the back face of the rear end of the limiting block.

The utility model discloses a bolt pre-tightening device, which utilizes the cooperation of a nut and a blind hole of a limiting block to ensure that the nut does not follow the rotation of the bolt in the screwing process of the bolt, but does linearly move along the axial direction of the blind hole, and the reaction force generated after the compression of a spring keeps the head of the bolt tightly pressed with a mounting plate, so that the loosening, falling or losing phenomena of the bolt can be obviously reduced under the condition of not using a spring gasket, and the safety and the reliability of equipment are effectively maintained.

Drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of the present utility model.

In the figure: 1. a limiting block; 2. a nut; 3. a spring; 4. a mounting plate; 5. and (5) a bolt.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the detailed description.

The embodiment discloses a stud pretension device, as shown in fig. 1, the device mainly comprises five parts of structures, namely a limiting block 1, a nut 2, a spring 3, a mounting plate 4 and a bolt 5.

Wherein, a blind hole suitable for placing the nut 2 is arranged in the limiting block 1, and the nut 2 adopts a polygonal nut, such as a common hexagonal nut or square nut or other polygons; and correspondingly processing the blind hole in the limiting block 1 into a polygon matched with the nut 2. After the nut 2 is placed in the blind hole, the polygonal blind hole can limit the rotation of the nut 2 in the circumferential direction, but the nut 2 can flexibly move along the axial direction of the blind hole.

And the springs 3 are sequentially placed in the blind holes, the springs 3 are compression springs, and then the mounting plates 4 are welded or riveted to the end parts of the limiting blocks, so that the springs 3 are limited between the nuts 2 and the mounting plates 4.

The mounting plate 4 is provided with a round hole matched with the bolt 5, and the bolt penetrates through the round hole on the mounting plate 4 and the spring 3 in the limiting block 1 to be screwed into the thread of the nut 2.

It can be seen that the nut 2 is limited by the polygonal blind hole shape, and does not follow rotation along with the screw-in of the bolt 5, but moves linearly along the blind hole axial direction in the blind hole along with the continuous screw-in of the bolt 5. The spring 3 is restrained between the nut 2 and the mounting plate 4, compressing the spring 3 by linear movement of the nut 2; after the spring 3 is compressed, a reaction force (leftward reaction force in fig. 1) is applied to the nut 2 and bolt 5 assembly by using the mounting plate 4 as a fulcrum, and the head of the bolt 5 and the mounting plate 4 are kept at a constant pressing force.

To ensure the realization of the structure, firstly, for convenience of description, the end part of the limiting block 1 connected with the mounting plate 4 is taken as a front end surface, and the other end is taken as a rear end surface; the length of the bolt 5 is required to be between the bolt mounting surface of the mounting plate 4 and the front end face and the rear end face of the nut 2, so that the bolt 5 can be screwed into the nut 2, but cannot abut against the limiting block 1. If the bolt 5 is too long, that is, the length of the bolt exceeds the distance from the bolt mounting surface of the mounting plate 4 to the rear end surface of the nut 2, a round hole with the corresponding diameter of the bolt can be processed on the rear end back surface of the limiting block 1, so that the exceeding part of the bolt penetrates out of the rear surface of the limiting block, and the stud is prevented from propping against the limiting block. The two conditions of bolt length can be used according to the demand of different operating modes.

In summary, for the stud pretensioning device disclosed in this embodiment, through the specific structural arrangement, the pressing force of the bolt 5 pressed on the mounting plate 4 is adjustable, and according to the conditions of the screw-in of the bolt 5 (or the compressed stroke of the spring 3), the rigidity of the spring 3, and the like, different and adjustable pretensioning forces are realized; therefore, the loosening, falling or losing phenomena of the bolts can be obviously reduced, and the safety and reliability of the equipment are effectively maintained.

The above embodiments are not intended to limit the present utility model, and the present utility model is not limited to the above examples, but is also intended to be limited to the following claims.

Claims

1. The utility model provides a double-screw bolt preloading device which characterized in that: it comprises the following steps:

the device comprises a limiting block (1), wherein a blind hole is formed in the limiting block (1);

The nut (2) is arranged in the blind hole of the limiting block (1), and the nut (2) can move along the axial direction of the blind hole but can not rotate circumferentially;

The mounting plate (4) is fixed at the front end part of the limiting block (1);

The spring (3) is arranged in the blind hole of the limiting block (1) and is limited between the nut (2) and the mounting plate (4);

The bolt (5) sequentially penetrates through the mounting plate (4) and the spring (3) and is screwed into the thread of the nut (2).

2. The stud pretensioning apparatus according to claim 1, wherein: the nut (2) is a polygonal nut, and the blind hole of the limiting block (1) is a polygonal hole matched with the shape of the nut (2).

3. The stud pretensioning apparatus according to claim 2, wherein: the polygonal nut adopted by the nut (2) is as follows: hexagonal nuts or square nuts or other polygonal nuts.

4. The stud pretensioning apparatus according to claim 1, wherein: a round hole through which a bolt (5) can pass is formed in the mounting plate (4).

5. The stud pretensioning apparatus according to claim 1, wherein: the mounting plate (4) is welded or riveted with the limiting block (1).

6. Stud pretensioning device according to any one of claims 1-5, characterized in that: the length of the bolt (5) is between the bolt mounting surface of the mounting plate (4) and the distance between the front end face and the rear end face of the nut (2).

7. Stud pretensioning device according to any one of claims 1-5, characterized in that: when the length of the bolt (5) exceeds the distance from the bolt mounting surface of the mounting plate (4) to the rear end face of the nut (2), a round hole corresponding to the diameter of the bolt (5) is formed in the back face of the rear end of the limiting block (1).