Bolt hydraulic tensioner suitable for multiple specifications

Abstract

The utility model relates to the technical field of bolt hydraulic tensioners, and discloses a bolt hydraulic tensioner suitable for multiple specifications, which comprises an oil cylinder, a piston barrel is arranged in the oil cylinder, an oil cavity is arranged between the oil cylinder and the piston barrel, one side wall of the oil cylinder is provided with an oil inlet joint, the top end of the piston barrel is provided with a threaded raised head, and the threaded raised head is connected with the oil cavity. The inner wall of the piston cylinder is respectively provided with a plurality of mounting chambers, L-shaped mounting plates are movably mounted in the mounting chambers, the inclined grooves in the opening of the bottom of the internal thread cylinder synchronously and downwards extrude the inclined side lugs, the L-shaped mounting plates synchronously move in the corresponding mounting chambers towards the axial center point of the piston cylinder respectively, and the piston cylinder is fixed to the inner wall of the piston cylinder through the L-shaped mounting plates. The threaded grooves in the inner walls of one sides of the multiple L-shaped mounting plates are connected to threads of the to-be-stretched bolts in a threaded and sleeving mode, then the bolt stretching device can adapt to stretching operation of the bolts of multiple specifications, it is avoided that threaded pipes of multiple different calibers need to be arranged, and the effect of saving the accessory cost is achieved.

Description

Technical Field

[0001] This utility model relates to the field of bolt hydraulic tensioner technology, and in particular to a bolt hydraulic tensioner adaptable to multiple specifications. Background Technology

[0002] A hydraulic bolt tensioner, or simply a hydraulic tensioner, is a device that can tighten or loosen bolts. It uses hydraulic power provided by an ultra-high pressure pump to stretch the bolt within its elastic deformation range, utilizing the allowable elastic range of the material, to achieve the purpose of tightening or loosening the bolt.

[0003] There is a hydraulic bolt tensioner that can meet the needs of bolts of various specifications (authorization announcement number: CN207464643U). It separates the original piston into two parts, thus separating the original threaded part. For bolts of different specifications, threaded tubes of different diameters can be replaced. The threaded tubes are fixed by fixing bolts, making replacement very convenient.

[0004] However, this type of hydraulic bolt tensioner has some shortcomings in actual use: for bolts of different specifications, it is necessary to replace the threaded tubes of different diameters, which increases the cost of accessories. At the same time, it is also necessary to repeatedly disassemble and assemble the fixing bolts on the threaded tubes, which is also cumbersome. Therefore, we propose a hydraulic bolt tensioner that can adapt to multiple specifications to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic tensioner for bolts of various specifications, thereby solving the aforementioned problems.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A hydraulic tensioner for bolts of various sizes includes a cylinder, a piston cylinder inside the cylinder, an oil chamber between the cylinder and the piston cylinder, an oil inlet connector on one side wall of the cylinder, a threaded protrusion at the top of the piston cylinder, multiple mounting chambers on the inner wall of the piston cylinder, L-shaped mounting plates movably mounted in each mounting chamber, threaded grooves on one side inner wall of each L-shaped mounting plate, inclined side ears on one side outer wall of each L-shaped mounting plate extending beyond the threaded protrusion, a connecting chamber on one side inner wall of each mounting chamber, and a spring-loaded reset mechanism for the corresponding L-shaped mounting plate in each connecting chamber. A helical clamping mechanism for the inclined side ears is provided on the threaded protrusion.

[0008] Preferably, multiple L-shaped mounting plates are arranged in a circumferential array, and the thread directions of the threaded grooves on the multiple L-shaped mounting plates are matched. By moving the threaded grooves on one side of the inner wall of the multiple L-shaped mounting plates synchronously towards the axis center point of the piston cylinder, the threaded grooves on one side of the inner wall of the multiple L-shaped mounting plates are threaded onto the threads of the bolt to be stretched.

[0009] Preferably, the elastic reset mechanism includes a circular plate and a reset spring. The circular plate is fixedly installed on one side of the corresponding L-shaped mounting plate, and one end of the reset spring is fixedly installed on one side of the circular plate. The other end of the reset spring is fixedly installed on the inner wall of one side of the corresponding connecting chamber. Under the action of multiple sets of elastic reset mechanisms, it is convenient for multiple L-shaped mounting plates to return to their original positions.

[0010] Preferably, the spiral clamping mechanism includes an internal threaded cylinder and a slanted groove. The internal threaded cylinder is threaded onto the threaded protrusion, and a slanted groove is provided at the bottom opening of the internal threaded cylinder. The slanted groove of the internal threaded cylinder presses against multiple inclined side ears. By screwing the internal threaded cylinder downward, the slanted groove at the bottom opening of the internal threaded cylinder synchronously presses down on multiple inclined side ears, causing multiple L-shaped mounting plates to move synchronously towards the axis center point of the piston cylinder in their respective mounting chambers.

[0011] Preferably, a first sealing ring and a second sealing ring are respectively provided in the oil cavity between the oil cylinder and the piston cylinder for sealing connection; the sealing of the oil cavity is achieved by the first sealing ring and the second sealing ring.

[0012] Preferably, a support ring is fixedly installed at the bottom end of the hydraulic cylinder, and the support ring has multiple side openings.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The bolt hydraulic tensioner in this case, by screwing the internal threaded cylinder downwards, causes the inclined groove at the bottom opening of the internal threaded cylinder to simultaneously press down multiple inclined side ears, causing multiple L-shaped mounting plates to move synchronously towards the axis center point of the piston cylinder in their respective mounting chambers. The threaded grooves on one side of the inner wall of the multiple L-shaped mounting plates are threaded onto the threads of the bolt to be tensioned, thus adapting to the tensioning operation of bolts of various specifications. This avoids the need to configure multiple threaded tubes of different diameters, thereby saving on parts costs. At the same time, it also avoids the need to repeatedly disassemble and assemble the fixing bolts on the threaded tube, making the operation simple and fast. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure in plan view of this utility model;

[0017] Figure 3 This is a partial cross-sectional structural diagram of the present invention;

[0018] Figure 4 This is a partial cross-sectional view of the structure of this utility model from an exploded perspective;

[0019] Figure 5 This is a structural schematic diagram of the L-shaped mounting plate of this utility model from a perspective.

[0020] In the diagram: 1. Oil cylinder; 2. Piston cylinder; 3. Oil chamber; 4. Oil inlet connector; 5. Threaded protrusion; 6. Mounting chamber; 7. L-shaped mounting plate; 8. Threaded groove; 9. Inclined side lug; 10. Connecting chamber; 11. Circular plate; 12. Return spring; 13. Internal threaded cylinder; 14. Inclined groove; 15. First sealing ring; 16. Second sealing ring; 17. Support ring; 18. Side opening. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figure 1-5 A hydraulic tensioner for bolts of various specifications includes a cylinder 1, a piston cylinder 2 inside the cylinder 1, an oil chamber 3 between the cylinder 1 and the piston cylinder 2, an oil inlet connector 4 on one side wall of the cylinder 1, a threaded protrusion 5 at the top of the piston cylinder 2, multiple mounting chambers 6 on the inner wall of the piston cylinder 2, L-shaped mounting plates 7 movably mounted in each of the multiple mounting chambers 6, threaded grooves 8 on one side inner wall of each of the multiple L-shaped mounting plates 7, inclined side ears 9 on one side outer wall of each of the multiple L-shaped mounting plates 7, the multiple inclined side ears 9 extending to the outside of the threaded protrusion 5, a connecting chamber 10 on one side inner wall of each of the multiple mounting chambers 6, an elastic reset mechanism for the corresponding L-shaped mounting plate 7 in each of the multiple connecting chambers 10, and a spiral clamping mechanism for the multiple inclined side ears 9 on the threaded protrusion 5.

[0023] Furthermore, multiple L-shaped mounting plates 7 are arranged in a circumferential array, and the thread directions of the threaded grooves 8 on the multiple L-shaped mounting plates 7 are matched. The threaded grooves 8 on one side of the multiple L-shaped mounting plates 7 move synchronously towards the axis center point of the piston cylinder 2, so that the threaded grooves 8 on one side of the multiple L-shaped mounting plates 7 are threaded onto the threads of the bolt to be stretched.

[0024] Specifically, the elastic reset mechanism includes a circular plate 11 and a reset spring 12. The circular plate 11 is fixedly installed on one side of the corresponding L-shaped mounting plate 7, and one end of the reset spring 12 is fixedly installed on one side of the circular plate 11. The other end of the reset spring 12 is fixedly installed on the inner wall of one side of the corresponding connecting chamber 10. Under the action of multiple sets of elastic reset mechanisms, multiple L-shaped mounting plates 7 can be easily restored to their original positions.

[0025] Furthermore, the spiral clamping mechanism includes an internal threaded cylinder 13 and a slanted groove 14. The internal threaded cylinder 13 is threaded onto the threaded protrusion 5. The slanted groove 14 is provided at the bottom opening of the internal threaded cylinder 13. The slanted groove 14 of the internal threaded cylinder 13 presses against multiple inclined side ears 9. By screwing the internal threaded cylinder 13 downward, the slanted groove 14 at the bottom opening of the internal threaded cylinder 13 simultaneously presses down on multiple inclined side ears 9, causing multiple L-shaped mounting plates 7 to move synchronously towards the axis center point of the piston cylinder 2 in their respective mounting chambers 6.

[0026] Furthermore, a first sealing ring 15 and a second sealing ring 16 are respectively provided in the oil chamber 3 between the oil cylinder 1 and the piston cylinder 2 for sealing connection; the sealing of the oil chamber 3 is achieved by the first sealing ring 15 and the second sealing ring 16.

[0027] Specifically, a support ring 17 is fixedly installed at the bottom of the hydraulic cylinder 1, and multiple side openings 18 are respectively opened on the support ring 17.

[0028] In use: By screwing the internal threaded cylinder 13 downwards, the inclined groove 14 at the bottom opening of the internal threaded cylinder 13 simultaneously presses down on multiple inclined side ears 9, causing multiple L-shaped mounting plates 7 to move synchronously towards the axis center point of the piston cylinder 2 in their respective mounting chambers 6. At this time, multiple return springs 12 are subjected to force and deformed, thereby driving the threaded grooves 8 on one side of the inner wall of multiple L-shaped mounting plates 7 to thread onto the threads of the bolt to be stretched. When stretching the bolt, high-pressure oil is injected into the oil chamber 3 in the oil cylinder 1 and piston cylinder 2 through the oil inlet connector 4, thereby pushing the piston cylinder 2 upwards, and stretching the bolt is achieved through the multiple L-shaped mounting plates 7 in the piston cylinder 2.

[0029] In summary, the bolt hydraulic tensioner in this case, by screwing the internal threaded cylinder 13 downwards, causes the inclined groove 14 at the bottom opening of the internal threaded cylinder 13 to simultaneously press down multiple inclined side ears 9, causing multiple L-shaped mounting plates 7 to move synchronously towards the axis center point of the piston cylinder 2 in their respective mounting chambers 6. The threaded grooves 8 on one side of the inner wall of the multiple L-shaped mounting plates 7 are threaded onto the threads of the bolt to be tensioned, thus adapting to the tensioning operation of bolts of various specifications. This avoids the need to configure multiple threaded tubes of different diameters, thereby saving on parts costs. At the same time, it also avoids the need to repeatedly disassemble and assemble the fixing bolts on the threaded tube, making the operation simple and fast.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A hydraulic tensioner for bolts of various specifications, comprising a hydraulic cylinder (1), characterized in that, The cylinder (1) is provided with a piston cylinder (2), and an oil chamber (3) is provided between the cylinder (1) and the piston cylinder (2). An oil inlet connector (4) is provided on one side wall of the cylinder (1). A threaded protrusion (5) is provided at the top of the piston cylinder (2). Multiple installation chambers (6) are provided on the inner wall of the piston cylinder (2). An L-shaped mounting plate (7) is movably installed in each of the multiple installation chambers (6). A threaded groove (8) is provided on one side inner wall of each of the multiple L-shaped mounting plates (7). An inclined side ear (9) is provided on one side outer wall of each of the multiple L-shaped mounting plates (7). The multiple inclined side ears (9) extend to the outside of the threaded protrusion (5). A connecting chamber (10) is provided on one side inner wall of each of the multiple installation chambers (6). An elastic reset mechanism for the corresponding L-shaped mounting plate (7) is provided in each of the multiple connecting chambers (10). A spiral pressing mechanism for the multiple inclined side ears (9) is provided on the threaded protrusion (5).

2. The hydraulic tensioner for bolts adaptable to multiple specifications according to claim 1, characterized in that, Multiple L-shaped mounting plates (7) are arranged in a circumferential array, and the thread directions of the threaded grooves (8) on the multiple L-shaped mounting plates (7) are matched.

3. The hydraulic tensioner for bolts adaptable to multiple specifications according to claim 2, characterized in that, The elastic reset mechanism includes a circular plate (11) and a reset spring (12). The circular plate (11) is fixedly installed on one side of the L-shaped mounting plate (7). One end of the reset spring (12) is fixedly installed on one side of the circular plate (11), and the other end of the reset spring (12) is fixedly installed on the inner wall of one side of the corresponding connecting chamber (10).

4. The hydraulic tensioner for bolts adaptable to multiple specifications according to claim 1, characterized in that, The spiral clamping mechanism includes an internal threaded cylinder (13) and a slanted groove (14). The internal threaded cylinder (13) is threaded onto the threaded protrusion (5). The slanted groove (14) is provided at the bottom opening of the internal threaded cylinder (13). The slanted groove (14) of the internal threaded cylinder (13) presses against multiple inclined side ears (9).

5. A hydraulic tensioner for bolts adaptable to multiple specifications according to claim 1, characterized in that, The oil chamber (3) between the oil cylinder (1) and the piston cylinder (2) is provided with a first sealing ring (15) and a second sealing ring (16) for sealing connection.

6. A hydraulic tensioner for bolts adaptable to multiple specifications according to claim 5, characterized in that, A support ring (17) is fixedly installed at the bottom of the oil cylinder (1), and multiple side openings (18) are respectively opened on the support ring (17).

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