Hydraulic stretcher capable of monitoring bolt stretching amount

Abstract

The utility model belongs to the technical field of bolt fastening equipment, and particularly relates to a hydraulic stretcher capable of monitoring bolt stretching amount, which comprises a bridge frame, a sleeve arranged in the bridge frame, a hollow oil cylinder arranged at the upper part of the bridge frame, a stretching piston arranged in the hollow oil cylinder, a return spring arranged on the upper surface of the piston and a cover plate fixedly connected, and a puller arranged in the cover plate, and a high-pressure oil pipe is movably connected in a support frame outside the hollow oil cylinder, and a hydraulic pump device is arranged on one side. The hydraulic pump device is internally provided with a pressure sensor and a hydraulic pull rod, the upper surface of the hydraulic pump device is provided with a pressure gauge, and the devices are matched for use, so that the reliability of bolt connection can be guaranteed through accurate bolt stretching amount control of the device, and the problems of loose connection, fatigue damage and the like caused by insufficient or excessive stretching amount are avoided; the overall quality and safety of the equipment are improved, and the equipment failure and maintenance frequency caused by the bolt connection problem are reduced by accurately controlling the bolt stretching amount, so that the maintenance cost and downtime of the equipment are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of bolt fastening equipment, specifically a hydraulic tensioner that can monitor the bolt tension. Background Technology

[0002] In the process of tightening high-strength bolts, the preload is usually controlled by the tensioning method, which typically requires the use of a hydraulic tensioning device. This device applies a certain axial force to the bolt, and after tightening the nut, the expected preload can be obtained by removing the external force. However, when there are dust, paint, metal or other particles on the machine body surface or gasket, these particles will affect the fit between the nut and the tightened surface, causing the bolt elongation to be less than the theoretical elongation, resulting in false tension, which reduces the reliability of bolt tightening.

[0003] A patent application with publication number CN202045491U discloses a hydraulic tensioner for monitoring bolt tension, including a support ring, a hollow cylinder, a nut collar, and a dial indicator. The support ring is located on the upper part of the hollow cylinder, and the dial indicator is located on the support ring. The nut collar is located on the lower part of the hollow cylinder.

[0004] The above solution still has some problems in practical application. When there are foreign objects on the surface of the machine body or the gasket, the nut will not fit well with the fastened surface, resulting in false tension. This will reduce the preload of the bolt and affect the reliability of the bolt fastening.

[0005] Therefore, this utility model provides a hydraulic tensioner that can monitor the tension of bolts. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this utility model to solve its technical problem is: the hydraulic tensioner that can monitor the bolt tension of this utility model includes a bridge frame, a sleeve is provided inside the bridge frame, and a hollow oil cylinder is provided on the upper part of the bridge frame.

[0008] The hollow cylinder is equipped with a tension piston inside. A return spring is fixedly installed on the upper surface of the tension piston. A cover plate is fixedly connected to the upper surface of the return spring. A puller is installed inside the cover plate. A support frame is installed on the outside of the hollow cylinder. A high-pressure oil pipe is movably connected inside the support frame. A hydraulic pump device is installed on one side of the high-pressure oil pipe. A pressure sensor is installed inside the hydraulic pump device. A hydraulic pull rod is installed inside the pressure sensor. A pressure gauge is installed on the upper surface of the hydraulic pump device.

[0009] Preferably, the cover plate has several locating pins connected to its internal thread, and a lifting strap is provided on the outer side of the cover plate, which is movably mounted on the cover plate by a fixing block.

[0010] Preferably, the support frame is provided with a plurality of screws, which are threadedly connected to the outer wall of the cable tray.

[0011] Preferably, a retaining ring is provided between the sleeve and the hollow oil cylinder.

[0012] Preferably, a bolt is provided inside the sleeve, and a nut is provided on the outside of the bolt.

[0013] Preferably, the hydraulic pump device has an internal oil storage tank, and the high-pressure oil pipe has an oil sealing port on the outside.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The hydraulic tensioner for monitoring bolt tension described in this utility model uses a combination of a bridge, sleeve, hollow cylinder, return spring, tension piston, puller, high-pressure oil pipe, retaining ring, and hydraulic pump to ensure the reliability of bolt connections through precise bolt tension control. This avoids problems such as loosening and fatigue damage caused by insufficient or excessive tension, thereby improving the overall quality and safety of the equipment. By accurately controlling the bolt tension, it reduces equipment failures and maintenance frequency caused by bolt connection problems, thus lowering equipment maintenance costs and downtime, and improving production efficiency. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.

[0018] Figure 2 This is a cross-sectional view of the bolt and nut fastening device according to Embodiment 1 of this utility model.

[0019] Figure 3 This is a cross-sectional view of the hollow hydraulic cylinder according to Embodiment 1 of this utility model.

[0020] Figure 4 This is a schematic diagram of the hydraulic pump device according to Embodiment 1 of this utility model.

[0021] In the diagram: 1. Cable tray; 2. Sleeve; 3. Hollow cylinder; 4. Positioning pin; 5. Return spring; 6. Tensioning piston; 7. Screw; 8. Puller; 9. Lifting strap; 10. High-pressure oil pipe; 11. Snap ring; 12. Hydraulic pump unit; 13. Pressure sensor; 14. Pressure gauge; 15. Hydraulic tie rod; 16. Support frame; 17. Cover plate; 19. Bolt; 20. Nut. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Example 1

[0024] like Figures 1 to 3 As shown in the embodiment of this utility model, a hydraulic tensioner for monitoring bolt tension includes a cable tray 1, a sleeve 2 inside the cable tray 1, and a hollow oil cylinder 3 on the upper part of the cable tray 1.

[0025] The hollow cylinder 3 is equipped with a tension piston 6 inside. A return spring 5 is fixedly installed on the upper surface of the tension piston 6. A cover plate 17 is fixedly connected to the upper surface of the return spring 5. A puller 8 is installed inside the cover plate 17. A support frame 16 is installed on the outside of the hollow cylinder 3. A high-pressure oil pipe 10 is movably connected inside the support frame 16. A hydraulic pump device 12 is installed on one side of the high-pressure oil pipe 10. A pressure sensor 13 is installed inside the hydraulic pump device 12. A hydraulic pull rod 15 is installed inside the pressure sensor 13. A pressure gauge 14 is installed on the upper surface of the hydraulic pump device 12.

[0026] Specifically, a sleeve 2 is movably installed inside the cable tray 1. Several holes are provided on the outer side of the sleeve 2 to facilitate adjustment. A retaining ring 11 is installed between the sleeve 2 and the hollow cylinder 3, serving as a buffer and isolator. The hollow cylinder 3 has a hollow design, allowing hydraulic fluid to be input into the hollow space via the hydraulic pump 12. This causes the tension piston 6, which is movably installed inside the hollow cylinder 3, to stretch upwards with the amount of hydraulic fluid input. A return spring 5 is installed on the tension piston 6, and a cover plate 17 is fixedly connected to the upper surface of the return spring 5. The cover plate 17... Several locating pins 4 are threadedly connected to the upper part of the hollow cylinder 3. The cover plate 17 serves as a limit. The outer side of the cover plate 17 is movably mounted with a lifting strap 9 via a fixed block, facilitating the operator's movement of the device. The puller 8 has a threaded internal structure. When the oil flows back, the return spring 5 returns the tension piston 6 to a fixed position. In actual use, the sleeve 2 is installed on the bridge frame 1, with the sleeve 2 in contact with the nut 20 and the puller 8 in threaded contact with the bolt 19. The hollow cylinder 3 is mounted on the bridge frame 1 via a retaining ring 11. The support frame 16 is threadedly connected to the outer side of the bridge frame 1 via screws 7. The support frame 16 has an oil inlet and a high-pressure oil pipe 10. When the oil supply port is connected, the operator pulls the hydraulic lever 15. The reciprocating motion of the hydraulic lever 15 generates a pulling force, which is transmitted to the pressure sensor 13. The pressure sensor 13 then transmits the pulling force to the hydraulic pump device 12. The pressure gauge 14 needs to be zeroed before use. The pressure gauge 14 monitors the pressure output by the hydraulic pump device 12. The operator observes the reading on the pressure gauge 14. Oil is then transported through the high-pressure oil pipe 10 to the hollow cylinder 3. Under pressure, the stretching piston 6 in the hollow cylinder 3 moves upward, causing the nut 20 to move upward. The nut 20 is threadedly connected to the bolt 19, thus stretching the bolt 19. This device monitors the bolt 19... The final tension of bolt 19 can prevent false tension, thus ensuring the reliability of bolt 19 fastening. The structure is simple and compact, easy to use, and has a high cost performance, making it suitable for a wide range of applications. The precise control of bolt 19 tension by this device can ensure the reliability of bolt 19 connection, avoiding problems such as loosening and fatigue damage caused by insufficient or excessive tension, thereby improving the overall quality and safety of the equipment. By accurately controlling the bolt 19 tension, the number of equipment failures and repairs caused by bolt 19 connection problems is reduced, thereby reducing equipment maintenance costs and downtime, and improving production efficiency.

[0027] like Figure 1 As shown, the cover plate 17 has several locating pins 4 internally threaded, and a lifting strap 9 is provided on the outer side of the cover plate 17. The lifting strap 9 is movably installed on the cover plate 17 through a fixing block.

[0028] Specifically, the cover plate 17 is threadedly connected to the hollow oil cylinder 3 by several positioning pins 4. A lifting strap 9 is provided on the outer side of the cover plate 17. The lifting strap 9 is movably installed on the cover plate 17 by a fixing block, which facilitates the operator to move the device freely.

[0029] like Figure 1 As shown, the support frame 16 is provided with a number of screws 7, which are threaded onto the outer wall of the cable tray 1.

[0030] Specifically, the support frame 16 is provided with several screws 7, which are threaded onto the outer wall of the bridge frame 1, so as to facilitate disassembly and replacement when the high-pressure oil pipe 10 is blocked.

[0031] like Figure 2 As shown, a retaining ring 11 is provided between the sleeve 2 and the hollow oil cylinder 3.

[0032] Specifically, a retaining ring 11 is provided between the sleeve 2 and the hollow oil cylinder 3. The retaining ring 11 serves to isolate and buffer the sleeve 2 and the hollow oil cylinder 3.

[0033] like Figure 2 As shown, a bolt 19 is provided inside the sleeve 2, and a nut 20 is provided on the outside of the bolt 19.

[0034] Specifically, a bolt 19 is provided inside the sleeve 2, and a nut 20 is provided on the outside of the bolt 19. The sleeve 2 contacts the bolt 19, and the puller 8 contacts the bolt 19.

[0035] Example 2

[0036] like Figures 1 to 4 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the hydraulic pump device 12 is provided with an oil storage tank inside, and the high-pressure oil pipe 10 is provided with an oil sealing port on the outside.

[0037] Specifically, the hydraulic pump device 12 has an oil storage tank inside, and the high-pressure oil pipe 10 has an oil sealing port on the outside. When the work is finished, the output oil flows back into the oil storage tank. After the high-pressure oil pipe 10 is pulled out, the oil sealing port seals the high-pressure oil pipe 10 to prevent dust contamination.

[0038] Working principle: A sleeve 2 is movable inside the cable tray 1. Several holes are provided on the outer side of the sleeve 2 to facilitate adjustment. A retaining ring 11 is provided between the sleeve 2 and the hollow cylinder 3, acting as a buffer and isolator. The hollow cylinder 3 has a hollow design, allowing hydraulic fluid to be input into the hollow space through the hydraulic pump 12. This causes the tension piston 6, which is movable inside the hollow cylinder 3, to stretch upwards with the amount of hydraulic fluid input. A return spring 5 is provided on the tension piston 6, and a cover plate 17 is fixedly connected to the upper surface of the return spring 5. The cover plate 17... Several locating pins 4 are threadedly connected to the upper part of the hollow cylinder 3. The cover plate 17 serves as a limit. The outer side of the cover plate 17 is movably mounted with a lifting strap 9 via a fixed block, facilitating the operator's movement of the device. The puller 8 has a threaded internal structure. When the oil flows back, the return spring 5 returns the tension piston 6 to a fixed position. In actual use, the sleeve 2 is installed on the bridge frame 1, with the sleeve 2 in contact with the nut 20 and the puller 8 in threaded contact with the bolt 19. The hollow cylinder 3 is mounted on the bridge frame 1 via a retaining ring 11. The support frame 16 is threadedly connected to the outer side of the bridge frame 1 via screws 7. The support frame 16 has an oil inlet and a high-pressure oil pipe 10. When the oil supply port is connected, the operator pulls the hydraulic lever 15. The reciprocating motion of the hydraulic lever 15 generates a pulling force, which is transmitted to the pressure sensor 13. The pressure sensor 13 then transmits the pulling force to the hydraulic pump device 12. The pressure gauge 14 needs to be zeroed before use. The pressure gauge 14 monitors the pressure output by the hydraulic pump device 12. The operator observes the reading on the pressure gauge 14. Oil is then transported through the high-pressure oil pipe 10 to the hollow cylinder 3. Under pressure, the stretching piston 6 in the hollow cylinder 3 moves upward, causing the nut 20 to move upward. The nut 20 is threadedly connected to the bolt 19, thus stretching the bolt 19. This device monitors the bolt 19... The final tension of bolt 19 can prevent false tension, thus ensuring the reliability of bolt 19 fastening. The structure is simple and compact, easy to use, and has a high cost performance, making it suitable for a wide range of applications. The precise control of bolt 19 tension by this device can ensure the reliability of bolt 19 connection, avoiding problems such as loosening and fatigue damage caused by insufficient or excessive tension, thereby improving the overall quality and safety of the equipment. By accurately controlling the bolt 19 tension, the number of equipment failures and repairs caused by bolt 19 connection problems is reduced, thereby reducing equipment maintenance costs and downtime, and improving production efficiency.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hydraulic tensioner for monitoring bolt tension, characterized in that: Includes a cable tray (1), the inside of which is provided with a sleeve (2), and the upper part of the cable tray (1) is provided with a hollow oil cylinder (3); The hollow cylinder (3) is equipped with a tension piston (6) inside. A return spring (5) is fixedly installed on the upper surface of the tension piston (6). A cover plate (17) is fixedly connected to the upper surface of the return spring (5). A puller (8) is installed inside the cover plate (17). A support frame (16) is installed on the outside of the hollow cylinder (3). A high-pressure oil pipe (10) is movably connected inside the support frame (16). A hydraulic pump device (12) is installed on one side of the high-pressure oil pipe (10). A pressure sensor (13) is installed inside the hydraulic pump device (12). A hydraulic pull rod (15) is installed inside the pressure sensor (13). A pressure gauge (14) is installed on the upper surface of the hydraulic pump device (12).

2. The hydraulic tensioner for monitoring bolt tension according to claim 1, characterized in that: The cover plate (17) has several positioning pins (4) internally threaded. The cover plate (17) is provided with a lifting strap (9) on its outer side. The lifting strap (9) is movably installed on the cover plate (17) by a fixing block.

3. A hydraulic tensioner for monitoring bolt tension according to claim 2, characterized in that: The support frame (16) is provided with a number of screws (7), which are threaded onto the outer wall of the cable tray (1).

4. A hydraulic tensioner for monitoring bolt tension according to claim 3, characterized in that: A retaining ring (11) is provided between the sleeve (2) and the hollow oil cylinder (3).

5. A hydraulic tensioner for monitoring bolt tension according to claim 4, characterized in that: The sleeve (2) is provided with a bolt (19) inside, and a nut (20) is provided on the outside of the bolt (19).

6. A hydraulic tensioner for monitoring bolt tension according to claim 5, characterized in that: The hydraulic pump device (12) is equipped with an oil storage tank inside, and the high-pressure oil pipe (10) is equipped with an oil sealing port on the outside.

Images