A bolt tensioner

Abstract

This application discloses a bolt tensioner, relating to the field of bolt tensioning. It includes a cylinder body, a support bridge connected to the lower part of the cylinder body, a pry sleeve disposed on the lower inner side of the support bridge, and a sealing baffle installed on the upper part of the support bridge, located on the lower inner side of the cylinder body. This application utilizes the force of a compression spring to push an extension plate downwards, causing the center sleeve to move downwards and allowing the tensioning head to quickly reset. During bolt tensioning, the sealing baffle installed on the upper part of the support bridge prevents debris generated during bolt tensioning from entering the cylinder body from the connection point, thus improving the cylinder body's service life. Continuous oil injection into the oil groove pushes a piston inside the oil groove upwards, which in turn pushes an upper lifting member upwards. The upward movement of the lifting member moves the tensioning head and the center sleeve, allowing for bolt tensioning.

Description

Technical Field

[0001] This application relates to the field of bolt tensioning, and more particularly to a bolt tensioner. Background Technology

[0002] A hydraulic bolt tensioner is an industrial device that uses a hydraulic pump as a power source and high-pressure hydraulic fluid to drive a piston to achieve elastic tensioning of bolts. It is widely used in power, petrochemical, shipbuilding, wind power, and heavy machinery industries. Its working pressure range is 150-1500 BAR, and it is compatible with bolt sizes from M20 to M400. It supports simultaneous tensioning by multiple devices to improve accuracy and efficiency. The device consists of a hydraulic pump, a tensioning body, a high-pressure hose, and a pressure gauge. The tensioning body includes components such as a piston cylinder, piston, support bridge, and tensioning nut. Tightening or loosening is achieved by controlling the tension amount.

[0003] The bolt tensioners currently in use have a support bridge and a cylinder body connected, but the connection is not tight enough. During the bolt tensioning process, when the bolt deforms, small debris is generated, which can easily enter the cylinder body from the connection between the two, affecting the service life of the cylinder body. Utility Model Content

[0004] To address the issue that the connection between the support bridge and the cylinder is not tight enough, and that small debris is generated when the bolt deforms during the bolt tensioning process, which can easily enter the cylinder from the connection point, this application provides a bolt tensioner.

[0005] The bolt tensioner provided in this application adopts the following technical solution:

[0006] The device includes a cylinder body, a support bridge connected to the lower part of the cylinder body, a paddle sleeve provided on the lower inner side of the support bridge, and a sealing baffle installed on the upper part of the support bridge, the sealing baffle being located on the lower inner side of the cylinder body.

[0007] By adopting the above technical solution, during the bolt stretching process, a sealing baffle is installed at the upper position of the support bridge to prevent the debris generated by bolt stretching from entering the cylinder body from the connection point, thereby improving the service life of the cylinder body.

[0008] Preferably, an oil groove is provided on the upper inner side of the cylinder body, a piston is installed on the lower inner side of the oil groove, and a lifting member is installed on the upper part of the piston.

[0009] By adopting the above technical solution, continuous oil injection will push the piston inside the oil tank to move upward within the oil tank, and the piston will push the upper lifting component to move upward.

[0010] Preferably, a tensioning head is installed on the inner side of the cylinder, the upper extension of the tensioning head is located on the upper part of the lifting member, and the upper surface of the lifting member is in contact with the upper extension of the tensioning head.

[0011] By adopting the above technical solution, the lifting component can push the tensioning head when it moves upward, and the tensioning head can stretch the bolt when it moves upward.

[0012] Preferably, a central sleeve is installed on the inner side of the lifting member, and the stretching head is located inside the central sleeve and fits against the inner wall of the central sleeve.

[0013] By adopting the above technical solution, when the central sleeve moves, it can drive the lower extension plate to move upward.

[0014] Preferably, an extension plate is installed at the lower part of the central sleeve, the extension plate is located inside the sealing baffle, and a cavity is formed between the upper part of the extension plate and the inner side of the cylinder body.

[0015] By adopting the above technical solution, the extension plate can be moved easily. At the same time, when the central sleeve moves, it can drive the lower extension plate to move up. When the extension plate moves up, it can push the compression spring to contract.

[0016] Preferably, the cylinder body has an installation groove in the upper part of the cavity, a spring seat is installed inside the installation groove, a compression spring is installed on the spring seat, and one end of the compression spring is connected to the extension plate.

[0017] By adopting the above technical solution, when the extension plate moves upward, it can push the compression spring to contract. After the stretching is completed, the hydraulic oil is discharged from the oil outlet and oil pipe. Then, by the force of the compression spring, the extension plate can be pushed downward, which will drive the center sleeve to move downward, so that the stretching head can be quickly reset.

[0018] Preferably, the cylinder body has an oil inlet and an oil outlet on its side, and a through hole is provided on the lower inner side of the oil trough on the cylinder body, the through hole being connected to the oil inlet and the oil outlet.

[0019] By adopting the above technical solution, an oil inlet pipe is connected at the oil inlet and an oil outlet pipe is connected at the oil outlet, and the pump injects hydraulic oil into the oil inlet through the oil inlet pipe.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application uses the force of the compression spring to push the extension plate downward, which in turn moves the center sleeve downward, allowing the tension head to quickly reset. During the tensioning process of the bolt, a sealing baffle is installed at the upper part of the support bridge to prevent the debris generated by the bolt tensioning from entering the interior of the cylinder from the connection point, thereby improving the service life of the cylinder.

[0022] 2. In this application, hydraulic oil is injected into the oil inlet through the oil inlet pipe. The hydraulic oil enters the oil tank through the through hole connected to the oil inlet. With continuous oil injection, the piston inside the oil tank will be pushed to move upward in the oil tank. The piston pushes the upper lifting member to move upward. When the lifting member moves upward, it can push the tension head and the center sleeve to move. When the lifting member moves upward, it can stretch the bolt. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of a bolt tensioner according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram illustrating the overall external structure of the embodiments of this application;

[0025] Figure 3 This is a schematic diagram illustrating the partial disassembly structure of the embodiments of this application;

[0026] Figure 4 This is a schematic diagram illustrating the inner assembly structure, which is the main feature of this application embodiment.

[0027] Reference numerals: 1. Cylinder block; 2. Support bridge; 3. Pulley sleeve; 4. Oil groove; 5. Piston; 6. Lifting component; 7. Pulling head; 8. Center sleeve; 9. Extension plate; 10. Cavity; 11. Mounting groove; 12. Spring seat; 13. Compression spring; 14. Oil inlet; 15. Oil outlet; 16. Through hole; 17. Sealing baffle. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] This application discloses a bolt tensioner, including a cylinder 1. A support bridge 2 is connected to the lower part of the cylinder 1. A sleeve 3 is provided on the lower inner side of the support bridge 2. A sealing baffle 17 is installed on the upper part of the support bridge 2. The sealing baffle 17 is located on the lower inner side of the cylinder 1. During the bolt tensioning process, the sealing baffle 17 installed on the upper part of the support bridge 2 can prevent the debris generated by bolt tensioning from entering the interior of the cylinder 1 from the connection.

[0030] Please refer to Figure 1 and Figure 3An oil groove 4 is provided on the upper inner side of the cylinder body 1. A piston 5 is installed on the lower inner side of the oil groove 4. A lifting member 6 is installed on the upper part of the piston 5. A tension head 7 is installed on the upper inner side of the cylinder body 1. The upper extension of the tension head 7 is located on the upper part of the lifting member 6, and the upper surface of the lifting member 6 is in contact with the upper extension of the tension head 7. A center sleeve 8 is installed on the inner side of the lifting member 6. The tension head 7 is located inside the center sleeve 8 and fits against the inner wall of the center sleeve 8. By continuously injecting oil, the piston 5 inside the oil groove 4 will be pushed to move upward in the oil groove 4. The piston 5 pushes the upper lifting member 6 to move upward. When the lifting member 6 moves upward, it can push the tension head 7 and the center sleeve 8 to move. When the lifting member 6 moves upward, it can stretch the bolt.

[0031] Please refer to Figures 1 to 4 An extension plate 9 is installed at the lower part of the central sleeve 8. The extension plate 9 is located inside the sealing baffle 17. A cavity 10 is formed between the upper part of the extension plate 9 and the inner side of the cylinder body 1. An installation groove 11 is opened at the upper part of the cavity 10 inside the cylinder body 1. A spring seat 12 is installed inside the installation groove 11. A compression spring 13 is installed on the spring seat 12. One end of the compression spring 13 is connected to the extension plate 9. When the central sleeve 8 moves, it can drive the lower extension plate 9 to move upward. When the extension plate 9 moves upward, it can push the compression spring 13 to contract. After the stretching is completed, the hydraulic oil is discharged from the oil outlet 15 and the oil outlet pipe. Then, by the force of the compression spring 13, the extension plate 9 can be pushed downward, which drives the central sleeve 8 to move downward, so that the stretching head 7 can be quickly reset.

[0032] Please refer to Figure 2 The cylinder body 1 has an oil inlet 14 and an oil outlet 15 on its side. The cylinder body 1 has a through hole 16 located on the lower inner side of the oil groove 4. The through hole 16 is connected to the oil inlet 14 and the oil outlet 15. An oil inlet pipe is connected to the oil inlet 14 and an oil outlet pipe is connected to the oil outlet 15. The pump injects hydraulic oil into the oil inlet 14 through the oil inlet pipe. After the stretching is completed, the hydraulic oil is discharged from the oil outlet 15 and the oil outlet pipe.

[0033] The implementation principle of a bolt tensioner according to an embodiment of this application is as follows: First, the bolt is fixed inside the tension head 7. Then, an oil inlet pipe is connected to the oil inlet 14, and an oil outlet pipe is connected to the oil outlet 15. The pump injects hydraulic oil into the oil inlet 14 through the oil inlet pipe. The hydraulic oil enters the oil tank 4 through the through hole 16 connected to the oil inlet 14. With continuous oil injection, the piston 5 inside the oil tank 4 is pushed upward. The piston 5 pushes the upper lifting member 6 upward. When the lifting member 6 moves upward, it can push the tension head 7 and the center sleeve 8 to move. When the tension head 7 moves upward, it can... When the bolt is stretched, the movement of the central sleeve 8 can drive the lower extension plate 9 to move upward. When the extension plate 9 moves upward, it can push the compression spring 13 to contract. After the stretching is completed, the hydraulic oil is discharged from the oil outlet 15 and the oil outlet pipe. Then, the force of the compression spring 13 can push the extension plate 9 to move downward, causing the central sleeve 8 to move downward, so that the stretching head 7 can quickly return to its original position. During the bolt stretching process, a sealing baffle 17 is installed at the upper position of the support bridge 2, which can prevent the debris generated by the bolt stretching from entering the interior of the cylinder 1 from the connection point, thereby improving the service life of the cylinder 1.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bolt tensioner, characterized in that: Includes a cylinder body (1), the lower part of which is connected to a support bridge (2), the lower inner side of which is provided with a paddle sleeve (3), and a sealing baffle (17) is installed on the upper part of the support bridge (2), the sealing baffle (17) being located on the lower inner side of the cylinder body (1).

2. A bolt tensioner according to claim 1, characterized in that: An oil groove (4) is provided on the upper inner side of the cylinder (1), a piston (5) is installed on the lower inner side of the oil groove (4), and a lifting member (6) is installed on the upper part of the piston (5).

3. A bolt tensioner according to claim 2, characterized in that: A tension head (7) is installed on the inner side of the cylinder (1). The upper extension of the tension head (7) is located on the upper part of the lifting member (6), and the upper surface of the lifting member (6) is in contact with the upper extension of the tension head (7).

4. A bolt tensioner according to claim 3, characterized in that: A central sleeve (8) is installed on the inner side of the lifting member (6), and the stretching head (7) is located inside the central sleeve (8) and fits against the inner wall of the central sleeve (8).

5. A bolt tensioner according to claim 4, characterized in that: An extension plate (9) is installed on the lower part of the central sleeve (8). The extension plate (9) is located inside the sealing baffle (17). A cavity (10) is formed between the upper part of the extension plate (9) and the inner side of the cylinder body (1).

6. A bolt tensioner according to claim 5, characterized in that: The cylinder body (1) has an installation groove (11) located at the upper part of the cavity (10). A spring seat (12) is installed inside the installation groove (11). A compression spring (13) is installed on the spring seat (12). One end of the compression spring (13) is connected to the extension plate (9).

7. A bolt tensioner according to claim 6, characterized in that: The cylinder body (1) has an oil inlet (14) and an oil outlet (15) on its side. A through hole (16) is provided on the lower inner side of the oil groove (4) of the cylinder body (1). The through hole (16) is connected to the oil inlet (14) and the oil outlet (15).

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