Hydraulic bolt tensioner

Abstract

The application discloses a hydraulic bolt tensioner and relates to the field of bolt tensioners, which comprises a main cylinder, a middle cylinder fixedly installed at the right end of the main cylinder, a secondary cylinder fixedly installed at the right end of the middle cylinder, an end cylinder fixedly installed at the right end of the secondary cylinder, a transmission shaft arranged in the main cylinder, and the right end of the transmission shaft penetrating the interiors of the middle cylinder, the secondary cylinder and the end cylinder; a connecting block arranged at the top of the main cylinder, a fixed support arranged at the right side of the connecting block, a sealing ring arranged between the adjusting bolt and the control valve body to form a reliable sealing structure, effectively block the hydraulic oil leakage path, avoid the hydraulic system pressure loss caused by leakage, reduce the number of operation interruptions, and significantly improve the continuous operation efficiency of the equipment; the bolt tensioner can effectively resist external impact, dust erosion and foreign matter interference, reduce the wear or damage risk of core components caused by external factors, prolong the service life of the equipment, and reduce the maintenance frequency and cost.

Description

Technical Field

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

[0002] A bolt tensioner is a device that uses a hydraulic booster pump to provide a hydraulic power source. The tension force is determined based on the tensile strength, yield coefficient, and elongation of the material. By utilizing the tensile strength generated by the ultra-high pressure oil pump, the bolt under force is stretched within its elastic deformation zone, resulting in slight deformation of the bolt diameter. This makes it easier to loosen or tighten the nut. There is no torsional shear force or lateral force, and no frictional damage to the contact surfaces of the connection. It is widely used in petrochemical, nuclear power, wind power, hydropower, thermal power, shipbuilding, railway, aerospace, mining, heavy machinery and other fields.

[0003] Traditional hydraulic bolt tensioning equipment suffers from insufficient sealing performance, leading to frequent hydraulic oil leaks. This not only affects work efficiency but also pollutes the working environment. Furthermore, the lack of protective measures makes core components susceptible to external impacts and dust corrosion, shortening their service life. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic bolt tensioner to solve the problems mentioned in the background art.

[0005] This utility model provides a hydraulic bolt tensioner, comprising:

[0006] The main cylinder has a middle cylinder fixedly installed at its right end, a secondary cylinder fixedly installed at its right end, and an end cylinder fixedly installed at its right end. A drive shaft is provided inside the main cylinder, and the right end of the drive shaft passes through the interior of the middle cylinder, the secondary cylinder, and the end cylinder.

[0007] A connecting block is provided on the top of the main cylinder. A fixed bracket is provided on the right side of the connecting block. A bearing seat is rotatably installed on one side of the fixed bracket. One end of the bearing seat extends through one side of the fixed bracket into the connecting block. A gear is sleeved inside the connecting block and on the bearing seat.

[0008] A control valve body is disposed at the top of the middle cylinder. A connecting shaft is inserted and installed at the top of the control valve body, and a connector is inserted and installed at the top of the connecting shaft.

[0009] By adopting the above technical solution, when the hydraulic bolt tensioner is working, the external power source inputs hydraulic oil through the joint and the axial control valve body. After the hydraulic oil enters, it pushes the transmission shaft to slide in the main cylinder, middle cylinder, secondary cylinder and end cylinder. The hydraulic energy is converted into mechanical energy, causing the transmission shaft to extend to the right, ready to perform the bolt tensioning operation. At the same time, the transmission structure composed of the connecting block, fixed bracket, bearing seat and gear can, when needed, achieve fine adjustment of the overall structure position or state by rotating the bearing seat and using the rotation of the gear in the connecting block, providing precise initial posture adjustment for the tensioning operation.

[0010] Preferably, the top of the secondary cylinder is provided with a rectangular box fixed to the control valve body, and a cover plate is provided on the side of the rectangular box away from the control valve body. The cover plate is fixed to the rectangular box by several bolts.

[0011] By adopting the above technical solution, the rectangular box and cover plate can protect the control valve body and surrounding components and assist in installation and fixation during this process.

[0012] Preferably, an adjusting bolt is inserted and installed on the side of the control valve body near the rectangular box, and a sealing ring is provided between the adjusting bolt and the control valve body.

[0013] By adopting the above technical solution, the sealing ring prevents hydraulic oil leakage and maintains stable hydraulic system pressure.

[0014] Preferably, an annular block is fixedly installed inside the main cylinder and at the left end of the drive shaft.

[0015] By adopting the above technical solution, the annular block limits the left end of the drive shaft, ensuring its sliding stability.

[0016] Preferably, the fixed bracket is fixed to the connecting block by a number of bolts, and the connecting block and the fixed bracket are fixed to the main cylinder by a number of bolts.

[0017] By adopting the above technical solutions, the stability of the connecting block, fixed support, and main cylinder structure is ensured.

[0018] Preferably, the main cylinder, middle cylinder, secondary cylinder and end cylinder are all slidably connected to the drive shaft.

[0019] By adopting the above technical solution, it is ensured that the drive shaft slides within the main cylinder, middle cylinder, secondary cylinder, and end cylinder.

[0020] Preferably, the gear is rotatably connected to the connecting block, and the gear is tightly welded to the bearing housing.

[0021] By adopting the above technical solution, it is ensured that the gear can rotate within the connecting block, thus guaranteeing the stability of the gear and bearing housing structure.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting a sealing ring between the adjusting bolt and the control valve body, a reliable sealing structure is formed, which effectively blocks the hydraulic oil leakage path, avoids hydraulic system pressure loss due to leakage, reduces the number of operation interruptions, and significantly improves the continuous operation efficiency of the equipment;

[0024] 2. The rectangular box and cover plate at the top of the secondary cylinder form a closed protective space, which acts as a physical barrier for the control valve body and surrounding key components. It can effectively resist external impacts, dust erosion and foreign object interference, reduce the risk of wear or damage to core components caused by external factors, extend the service life of the equipment, and reduce the frequency and cost of maintenance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a hydraulic bolt tensioner according to an embodiment of this application. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the overall structure of a hydraulic bolt tensioner according to an embodiment of this application. Figure 2

[0027] Figure 3 This is an exploded structural diagram of the connecting block and the fixing bracket in an embodiment of this application;

[0028] Figure 4 This is a schematic cross-sectional view of the overall structure in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram illustrating a partial structure of an embodiment of this application.

[0030] Reference numerals in the attached drawings: 1. Main cylinder; 2. Middle cylinder; 3. Secondary cylinder; 4. End cylinder; 5. Drive shaft; 6. Annular block; 7. Connecting block; 8. Fixed bracket; 9. Bearing seat; 10. Gear; 11. Control valve body; 12. Connecting shaft; 13. Joint; 14. Sealing ring; 15. Adjusting bolt; 16. Rectangular box; 17. Cover plate. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0032] This application discloses a hydraulic bolt tensioner.

[0033] Reference Figures 1-3 A hydraulic bolt tensioner, comprising:

[0034] The main cylinder 1 has a middle cylinder 2 fixedly installed at the right end of the main cylinder 1, a secondary cylinder 3 fixedly installed at the right end of the middle cylinder 2, and an end cylinder 4 fixedly installed at the right end of the secondary cylinder 3. A drive shaft 5 is provided inside the main cylinder 1, and the right end of the drive shaft 5 passes through the interior of the middle cylinder 2, the secondary cylinder 3 and the end cylinder 4.

[0035] A connecting block 7 is located at the top of the main cylinder 1. A fixed bracket 8 is located on the right side of the connecting block 7. A bearing seat 9 is rotatably mounted on one side of the fixed bracket 8. One end of the bearing seat 9 extends through one side of the fixed bracket 8 into the connecting block 7. A gear 10 is fitted inside the connecting block 7 and on the bearing seat 9. At the same time, the transmission structure composed of the connecting block 7, the fixed bracket 8, the bearing seat 9, and the gear 10 can, when needed, achieve fine adjustment of the overall structural position or state by rotating the bearing seat 9 and using the rotation of the gear 10 within the connecting block 7, providing precise initial posture adjustment for the stretching operation. A control valve body 11 is located at the top of the middle cylinder 2. A connecting shaft 12 is inserted into the top of the control valve body 11, and a connector 13 is inserted into the top of the connecting shaft 12. An external power source inputs hydraulic oil to the control valve body 11 through the connector 13 and the connecting shaft 12. After the hydraulic oil enters, it pushes the drive shaft 5 to slide in the main cylinder 1, the middle cylinder 2, the secondary cylinder 3 and the end cylinder 4. The hydraulic energy is converted into mechanical energy, causing the drive shaft 5 to extend to the right, ready to perform a bolt stretching operation.

[0036] refer to Figure 5 The top of the secondary cylinder 3 is provided with a rectangular box 16 that is fixed to the control valve body 11. A cover plate 17 is provided on the side of the rectangular box 16 away from the control valve body 11. The cover plate 17 is fixed to the rectangular box 16 by several bolts. In this process, the rectangular box 16 and the cover plate 17 can protect the control valve body 11 and surrounding components and assist in the installation and fixing.

[0037] refer to Figure 5 An adjusting bolt 15 is inserted and installed on the side of the control valve body 11 near the rectangular box 16. A sealing ring 14 is provided between the adjusting bolt 15 and the control valve body 11. The sealing ring 14 prevents hydraulic oil leakage and maintains the pressure stability of the hydraulic system.

[0038] refer to Figure 4 An annular block 6 is fixedly installed inside the main cylinder 1 and at the left end of the drive shaft 5. The annular block 6 limits the left end of the drive shaft 5 to ensure its sliding stability.

[0039] refer to Figure 2 The fixed bracket 8 is fixed to the connecting block 7 by several bolts, and the connecting block 7 and the fixed bracket 8 are fixed to the main cylinder 1 by several bolts, so as to ensure the stability of the structure of the connecting block 7, the fixed bracket 8 and the main cylinder 1.

[0040] refer to Figure 4The main cylinder 1, the middle cylinder 2, the secondary cylinder 3, and the end cylinder 4 are all slidably connected to the drive shaft 5, ensuring that the drive shaft 5 slides within the main cylinder 1, the middle cylinder 2, the secondary cylinder 3, and the end cylinder 4.

[0041] refer to Figure 3 Gear 10 is rotatably connected to connecting block 7, and gear 10 is tightly welded to bearing seat 9, ensuring that gear 10 can rotate within connecting block 7 and guaranteeing the stability of the structure of gear 10 and bearing seat 9.

[0042] The implementation principle of the hydraulic bolt tensioner in this application embodiment is as follows: When the hydraulic bolt tensioner is working, the external power source inputs hydraulic oil to the control valve body 11 through the connector 13 and the connecting shaft 12. After the hydraulic oil enters, it pushes the transmission shaft 5 to slide in the main cylinder 1, the middle cylinder 2, the secondary cylinder 3 and the end cylinder 4. The hydraulic energy is converted into mechanical energy, causing the transmission shaft 5 to extend to the right, ready to perform the bolt tensioning operation. At the same time, the transmission structure composed of the connecting block 7, the fixed bracket 8, the bearing seat 9 and the gear 10 can, when needed, achieve fine adjustment of the overall structure position or state by rotating the bearing seat 9 and using the rotation of the gear 10 in the connecting block 7, providing a precise initial posture adjustment for the tensioning operation. The annular block 6 limits the left end of the transmission shaft 5 to ensure its sliding stability.

[0043] When the drive shaft 5 contacts and acts on the bolt, hydraulic oil is continuously input. The axial force of the drive shaft 5 stretches the bolt, causing it to undergo elastic deformation. During this process, the rectangular box 16 and the cover plate 17 can protect the control valve body 11 and surrounding components and assist in installation and fixation. The adjusting bolt 15 and the sealing ring 14 cooperate to finely adjust the pressure, flow rate and other parameters of the hydraulic oil circuit in the control valve body 11 to ensure that the stretching force is accurate and controllable. On the other hand, the sealing ring 14 prevents hydraulic oil leakage and maintains the stability of the hydraulic system pressure. After the bolt is stretched to the specified preload, the hydraulic system is depressurized, and the drive shaft 5 retracts under its own elastic reset or external assistance, completing one bolt stretching operation. All components return to the initial or standby state to prepare for the next operation.

[0044] 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 hydraulic bolt tensioner, characterized in that: include: A main cylinder (1) is provided, a middle cylinder (2) is fixedly installed at the right end of the main cylinder (1), a secondary cylinder (3) is fixedly installed at the right end of the middle cylinder (2), an end cylinder (4) is fixedly installed at the right end of the secondary cylinder (3), and a drive shaft (5) is provided inside the main cylinder (1). The right end of the drive shaft (5) passes through the interior of the middle cylinder (2), the secondary cylinder (3), and the end cylinder (4). A connecting block (7) is provided on the top of the main cylinder (1). A fixed bracket (8) is provided on the right side of the connecting block (7). A bearing seat (9) is rotatably installed on one side of the fixed bracket (8). One end of the bearing seat (9) extends through one side of the fixed bracket (8) into the connecting block (7). A gear (10) is sleeved inside the connecting block (7) and located on the bearing seat (9). A control valve body (11) is disposed on the top of the middle cylinder (2). A connecting shaft (12) is inserted into the top of the control valve body (11), and a connector (13) is inserted into the top of the connecting shaft (12).

2. The hydraulic bolt tensioner according to claim 1, characterized in that: The top of the secondary cylinder (3) is provided with a rectangular box (16) fixed to the control valve body (11). A cover plate (17) is provided on the side of the rectangular box (16) away from the control valve body (11). The cover plate (17) is fixed to the rectangular box (16) by several bolts.

3. A hydraulic bolt tensioner according to claim 1, characterized in that: An adjusting bolt (15) is inserted and installed on the side of the control valve body (11) near the rectangular box (16), and a sealing ring (14) is provided between the adjusting bolt (15) and the control valve body (11).

4. A hydraulic bolt tensioner according to claim 1, characterized in that: An annular block (6) is fixedly installed inside the main cylinder (1) and at the left end of the drive shaft (5).

5. A hydraulic bolt tensioner according to claim 1, characterized in that: The fixed bracket (8) is fixed to the connecting block (7) by several bolts, and the connecting block (7) and the fixed bracket (8) are fixed to the main cylinder (1) by several bolts.

6. A hydraulic bolt tensioner according to claim 1, characterized in that: The main cylinder (1), middle cylinder (2), secondary cylinder (3) and end cylinder (4) are all slidably connected to the drive shaft (5).

7. A hydraulic bolt tensioner according to claim 1, characterized in that: The gear (10) is rotatably connected to the connecting block (7), and the gear (10) is tightly welded to the bearing seat (9).

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