Hollow hydraulic stretcher

Abstract

The utility model relates to the technical field of hydraulic stretchers, and discloses a hollow type hydraulic stretchers, a connecting sleeve and a bottom sleeve are detachably installed on the upper side and the lower side of an outer sleeve base respectively, sleeve structures of different types can be replaced according to using requirements, and the connecting requirements of bolts of different types can be met. The driving ring seat is rotationally mounted in the bottom sleeve under the driving of the driving worm, the fastening sleeve is mounted on the lower portion of the driving ring seat in an embedded mode, and the fastening sleeve is mounted on the lower portion of the driving ring seat in an embedded mode through a notch. The installation and use requirements of different bolts can be met only by replacing the fastening sleeve, the bottom sleeve does not need to be integrally replaced, the use convenience of the device is greatly improved, fastening driving is conducted on the fastening sleeve through the driving worm, the driving structure is simple, operation is labor-saving, and due to the axial rotation type driving mode, the installation and use requirements of different bolts can be met. The working space of the fastening tool can be reduced, and fastening operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic tensioners, and particularly relates to a hollow hydraulic tensioner. Background Art

[0002] Bolts and nuts are indispensable parts in the assembly of the mechanical field. The fixing method of bolts and nuts is firmer and more reliable than other fixing methods, so it has become the most commonly used method to fix two or more parts together. For some large equipment, since the bolts used at the connection are relatively thick, the pre-tightening force for bolt tightening is very large, and it is very laborious to tighten and install the bolts. In order to reduce the difficulty of bolt tightening and installation, when installing and tightening bolts, a hydraulic tensioner is often used to assist in stretching the bolts. The hydraulic tensioner is connected to the bolt through its internal thread, and the pre-tightening tension is provided by stretching the hydraulic inner cylinder to assist in the installation and tightening of the bolts, which is an important auxiliary tool for bolt tightening and installation.

[0003] The hydraulic tensioner is installed and connected to the bolt through a barrel sleeve structure. Since there are many specifications and types of bolts, in order to stretch and install different bolts, different barrel sleeve structures need to be replaced during use. The barrel sleeve structure is installed and connected to the tensioner through a disassembly structure, and the whole barrel sleeve structure needs to be disassembled and assembled to complete the replacement, which is very inconvenient to use. Therefore, a hollow hydraulic tensioner is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a hollow hydraulic tensioner to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A hollow hydraulic tensioner, including a stretching mechanism and a connecting mechanism. The stretching mechanism includes an external barrel seat, a movable inner cylinder and a spring. The movable inner cylinder is movably installed inside the external barrel seat, and the spring is abutted and installed on the upper part of the movable inner cylinder.

[0006] The connecting mechanism includes a connecting barrel sleeve and a bottom barrel sleeve. The connecting barrel sleeve and the bottom barrel sleeve are respectively detachably installed on the upper and lower sides of the external barrel seat. A driving worm, a driving ring seat and a fastening barrel sleeve are arranged inside the bottom barrel sleeve. The driving ring seat is rotatably installed inside the bottom barrel sleeve under the drive of the driving worm, and the fastening barrel sleeve is fitted and installed on the lower part of the driving ring seat.

[0007] Preferably, a lifting belt is installed on the upper part of the external barrel seat. An inner cylinder installation cavity is arranged inside the external barrel seat. The movable inner cylinder is slidably installed inside the inner cylinder installation cavity, and a sealing oil ring is arranged on the peripheral side of the lower part of the movable inner cylinder.

[0008] Preferably, an oil supply interface is provided on the side of the above-mentioned external cylinder seat, and the oil supply interface is connected with the lower part of the inner cylinder mounting cavity, the spring is sleeved on the upper part of the movable inner cylinder, and a resistance ring seat is provided at the lower part of the movable inner cylinder, and the spring is installed in resistance to the upper part of the resistance ring seat.

[0009] Preferably, the upper portion of the outer cylinder seat is provided with an alignment groove, the lower portion of the connecting cylinder sleeve is fitted in the alignment groove, and the lower portion of the connecting cylinder sleeve is in contact with and fits against the top of the movable inner cylinder.

[0010] Preferably, a sleeve mounting groove is provided at the lower portion of the external sleeve seat, the upper portion of the external sleeve seat is aligned and embedded in the inner side of the sleeve mounting groove, the side of the sleeve mounting groove is evenly provided with mounting screws in a circular shape, and the bottom sleeve is fixedly installed at the lower portion of the external sleeve seat by the mounting screws.

[0011] Preferably, a ring seat mounting groove is provided inside the bottom sleeve, the drive ring seat is rotatably installed on the inner side of the ring seat mounting groove, the upper part of the drive ring seat is slidingly fitted with the ring seat inside the ring seat mounting groove, the lower part of the ring seat mounting groove is threadedly connected to the limiting ring seat, the lower part of the drive ring seat is slidingly fitted with the top side of the limiting ring seat, the lower part of the drive ring seat is provided with a mounting groove, and the fastening sleeve is mounted on the inner side of the mounting groove.

[0012] Preferably, the driving worm is rotatably mounted on the side of the bottom sleeve, the upper circumferential side of the driving ring seat is provided with meshing teeth, the upper part of the driving ring seat is meshedly connected with the worm section in the middle of the driving worm through the meshing teeth, and the end of the driving worm is provided with a hexagonal socket.

[0013] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0014] The hydraulic tensioner adopts a split structural sleeve, and the connecting sleeve and the bottom sleeve both adopt a detachable structural setting. Different types of sleeve structures can be replaced according to usage needs to meet the connection requirements of different types of bolts, and the fastening sleeve is set to be split. The fastening sleeve is installed at the lower part of the driving ring seat through a slot, and the disassembly and assembly operation is convenient. When performing tensioning installation of bolts of different sizes, only the fastening sleeve needs to be replaced to adapt to the installation and use requirements of different bolts. There is no need to replace the bottom sleeve as a whole, which eliminates the need for component disassembly and assembly, greatly improving the convenience of use of the device. The fastening sleeve is tightened and driven by a driving worm, and the driving structure is simple and labor-saving. In addition, due to the axial rotation drive method, the working space of the fastening tool can be reduced, which is conducive to the fastening operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the overall three-dimensional structure of the present utility model;

[0017] Figure 2 Schematic diagram of the overall internal sectional structure of the present utility model;

[0018] Figure 3 Schematic diagram of the overall disassembled upper structure of the present utility model;

[0019] Figure 4 Schematic diagram of the overall disassembled lower structure of the present utility model;

[0020] Figure 5 Schematic diagram of the installation structure of the fastening cylinder sleeve of the present utility model;

[0021] Figure 6 Schematic diagram of the installation structure of the driving worm and the driving ring seat of the present utility model.

[0022] Explanation of reference numerals: 1. External cylinder base; 2. Movable inner cylinder; 3. Spring; 4. Oil supply interface; 5. Lifting belt; 6. Connecting cylinder sleeve; 7. Bottom cylinder sleeve; 8. Driving worm; 9. Driving ring seat; 10. Fastening cylinder sleeve; 11. Limiting ring seat; 12. Installation screw; 13. Meshing tooth groove; 14. Installation groove. Detailed implementation manners

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than 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 efforts belong to the scope protected by the present utility model.

[0024] It should be noted that the structures, ratios, sizes, etc. shown in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present application can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed in the present application can cover.

[0025] Embodiment

[0026] Please refer to Figure 1-6 , the present utility model provides a technical solution: a hollow hydraulic tensioner, including a tensioning mechanism and a connecting mechanism. The tensioning mechanism is used for the tensile drive of bolts. The tensioning mechanism includes an external cylinder base 1, a movable inner cylinder 2 and a spring 3. For the convenience of moving and carrying the device, as shown in the appendix Figure 1 , a carrying strap 5 is installed on the upper part of the external cylinder base 1. For the installation and connection of the movable inner cylinder 2, as shown in the appendix Figure 2 , an inner cylinder installation cavity is provided inside the external cylinder base 1, and the movable inner cylinder 2 is slidably installed on the inner side of the inner cylinder installation cavity. For providing driving hydraulic fluid, as shown in the appendix Figure 1 , an oil supply interface 4 is provided on the side of the external cylinder base 1. The oil supply interface 4 is communicated with the lower part of the inner cylinder installation cavity, forming an oil cylinder type tensile drive structure. In order to improve the oil tightness of the lower part of the movable inner cylinder 2, a sealing oil ring is provided on the circumferential side of the lower part of the movable inner cylinder 2.

[0027] In order to improve the reset driving force of the movable inner cylinder 2, the spring 3 is abutted and installed on the upper part of the movable inner cylinder 2. As shown in the appendix Figure 2 , the spring 3 is sleeved on the upper part of the movable inner cylinder 2. For the convenience of the abutting installation of the spring 3, a abutting ring seat is provided on the lower part of the movable inner cylinder 2, and the spring 3 is abutted and installed on the upper part of the abutting ring seat.

[0028] The connecting mechanism is used for the connection and installation of the device and the bolt. The connecting mechanism includes a connecting sleeve 6 and a bottom sleeve 7. The connecting sleeve 6 and the bottom sleeve 7 are respectively detachably installed on the upper and lower sides of the external cylinder base 1. The connecting sleeve 6 is used for the fastening installation with the end of the bolt. An internal thread is provided in the middle of the connecting sleeve 6. For the installation and connection of the connecting sleeve 6, as shown in the appendix Figure 3 , an alignment through groove is provided on the upper part of the external cylinder base 1. The lower part of the connecting sleeve 6 is fitted and installed with the alignment through groove, and the lower part of the connecting sleeve 6 is in abutting and fitting with the top of the movable inner cylinder 2.

[0029] For the connection and installation of the bottom sleeve 7, as shown in the appendix Figure 4 , a sleeve installation groove is provided on the lower part of the external cylinder base 1. The upper part of the external cylinder base 1 is fitted and installed inside the sleeve installation groove. For the installation and limitation of the bottom sleeve 7, installation screws 12 are uniformly arranged in a circumferential shape on the side of the sleeve installation groove. The bottom sleeve 7 is fixedly installed on the lower part of the external cylinder base 1 through the installation screws 12. Both the connecting sleeve 6 and the bottom sleeve 7 are provided with detachable structures. Different types of sleeve structures can be replaced according to the use needs, which can meet the connection requirements of different types of bolts.

[0030] To screw and fasten the nut, a driving worm 8, a driving ring seat 9, and a fastening sleeve 10 are arranged inside the bottom barrel sleeve 7. To connect and install the driving ring seat 9, as shown in the appendix Figure 2 As shown, a ring seat installation groove is penetrated and arranged inside the bottom barrel sleeve 7. The driving ring seat 9 is rotatably installed on the inner side of the ring seat installation groove. The upper part of the driving ring seat 9 is slidably fitted with the ring seat on the inner side of the ring seat installation groove. To install and support the driving ring seat 9, a limiting ring seat 11 is threadedly connected to the lower part of the ring seat installation groove. The lower part of the driving ring seat 9 is slidably fitted with the top side of the limiting ring seat 11. To install and connect the fastening sleeve 10, an installation slot 14 is arranged at the lower part of the driving ring seat 9. The fastening sleeve 10 is fitted and installed on the inner side of the installation slot 14. The fastening sleeve 10 is fitted and installed at the lower part of the driving ring seat 9 through a notch. The disassembly and assembly operations are convenient. When stretching and installing bolts of different sizes, only the fastening sleeve 10 needs to be replaced to adapt to the installation and use requirements of different bolts. There is no need to replace the bottom barrel sleeve 7 as a whole, saving the disassembly and assembly operations of components and greatly improving the use convenience of the device.

[0031] The driving worm 8 is used for the rotational drive of the driving ring seat 9. As shown in the appendix Figure 5 As shown, the driving worm 8 is rotatably installed on the side of the bottom barrel sleeve 7. To engage and drive with the driving worm 8, as shown in the appendix Figure 6 As shown, engaging tooth grooves 13 are arranged on the peripheral side of the upper part of the driving ring seat 9. The upper part of the driving ring seat 9 is meshed and connected with the worm section in the middle of the driving worm 8 through the engaging tooth grooves 13. The driving ring seat 9 is rotatably installed inside the bottom barrel sleeve 7 under the drive of the driving worm 8. The fastening sleeve 10 is tightly driven through the driving worm 8. The driving structure is simple and the operation is labor-saving. And due to the axial rotation type of driving method, the working space of the fastening tool can be reduced, which is beneficial to the nut fastening operation. To facilitate the cooperation with external tools, a hexagonal socket is arranged at the end of the driving worm 8.

[0032] Working principle or structural principle, when in use, select the connecting sleeve 6 and the fastening sleeve 10 of appropriate specifications according to the type of bolt, and then first put the fastening sleeve 10 on the upper part of the nut of the bolt, and then put the device as a whole on the upper part of the bolt, and make the fastening sleeve 10 fit into the inner side of the installation groove 14 at the lower part of the drive ring seat 9 through alignment and fit, and after completion, install the connecting sleeve 6 on the upper part of the bolt by screwing, and then screw and tighten the connecting sleeve 6 so that the connecting sleeve 6 and the groove on the upper part of the external sleeve seat 1 are aligned and fit, and after completion, install and connect the oil supply pipeline to the upper part of the oil supply interface 4 and install the oil supply pipeline to limit and lock it, and after completion, start the hydraulic oil pump, and under the drive of the oil pump to provide oil, the inside of the external sleeve seat 1 The movable inner cylinder 2 is lifted upward to drive the connecting sleeve 6 to stretch and pull the bolt, and the tensioning force is used to complete the tensioning of the bolt connection. The nut is tightened several times during the stretching process. When tightening, the column head of the hexagonal tightening tool is inserted into the inner side of the hexagonal socket at the end of the driving worm 8. Then, the driving ring seat 9 is driven to rotate by the driving worm 8. Driven by the driving ring seat 9, the tightening sleeve 10 drives the nut to rotate to complete the tightening operation of the nut. The tightening is performed several times until the installation tensioning requirement of the bolt is met. Then, the oil pressure is released. The loss of oil pushes the movable inner cylinder 2 to move down and reset under the push of the spring 3. Then, the connecting sleeve 6 is screwed and disassembled, and the device is disassembled and removed to complete the use work.

[0033] In summary, the hydraulic tensioner adopts a split structural sleeve, and the connecting sleeve 6 and the bottom sleeve 7 both adopt a detachable structural setting. Different types of sleeve structures can be replaced according to usage needs to meet the connection requirements of different types of bolts, and the fastening sleeve 10 is set to be split. The fastening sleeve 10 is installed at the lower part of the driving ring seat 9 through a slot, and the disassembly and assembly operation is convenient. When performing tensioning installation of bolts of different sizes, only the fastening sleeve 10 needs to be replaced to adapt to the installation and use requirements of different bolts. There is no need to replace the bottom sleeve 7 as a whole, which eliminates the need for component disassembly and assembly operations, greatly improving the convenience of use of the device. The fastening sleeve 10 is tightened and driven by driving the worm 8. The driving structure is simple and labor-saving to operate. Due to the axial rotation drive method, the working space of the fastening tool can be reduced, which is conducive to the fastening operation.

[0034] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. A hollow hydraulic stretcher, comprising a stretching mechanism and a connecting mechanism, characterized in that: The stretching mechanism comprises an external cylinder seat (1), a movable inner cylinder (2) and a spring (3); the movable inner cylinder (2) is movably mounted inside the external cylinder seat (1), and the spring (3) is mounted in abutment against the upper part of the movable inner cylinder (2); The connecting mechanism comprises a connecting sleeve (6) and a bottom sleeve (7), wherein the connecting sleeve (6) and the bottom sleeve (7) are detachably mounted on the upper and lower sides of the outer sleeve seat (1), respectively; a driving worm (8), a driving ring seat (9) and a fastening sleeve (10) are arranged inside the bottom sleeve (7); the driving ring seat (9) is rotatably mounted inside the bottom sleeve (7) under the drive of the driving worm (8); and the fastening sleeve (10) is mounted in a chimerical manner on the lower part of the driving ring seat (9).

2. A hollow hydraulic tensioner according to claim 1, characterized in that: A lifting belt (5) is installed on the upper part of the external cylinder seat (1), an inner cylinder installation cavity is provided inside the external cylinder seat (1), the movable inner cylinder (2) is slidably installed on the inner side of the inner cylinder installation cavity, and a sealing oil ring is provided on the lower circumference of the movable inner cylinder (2).

3. A hollow hydraulic tensioner according to claim 2, characterized in that: An oil supply interface (4) is provided on the side of the external cylinder seat (1), and the oil supply interface (4) is communicated with the lower part of the inner cylinder installation cavity. The spring (3) is sleeved on the upper part of the movable inner cylinder (2), and a resistance ring seat is provided at the lower part of the movable inner cylinder (2). The spring (3) is installed in resistance to the upper part of the resistance ring seat.

4. A hollow hydraulic tensioner according to claim 1, characterized in that: The upper portion of the outer cylinder seat (1) is provided with an alignment groove, the lower portion of the connecting cylinder sleeve (6) is fitted in the alignment groove, and the lower portion of the connecting cylinder sleeve (6) is in contact with and fits against the top of the movable inner cylinder (2).

5. A hollow hydraulic tensioner according to claim 4, characterized in that: A sleeve mounting groove is provided at the lower portion of the external sleeve seat (1), the upper portion of the external sleeve seat (1) is aligned and fitted into the inner side of the sleeve mounting groove, mounting screws (12) are evenly arranged on the sides of the sleeve mounting groove in a circular shape, and the bottom sleeve (7) is fixedly mounted to the lower portion of the external sleeve seat (1) by means of the mounting screws (12).

6. A hollow hydraulic tensioner according to claim 5, characterized in that: The bottom sleeve (7) is provided with a ring seat installation groove extending therethrough, the drive ring seat (9) is rotatably mounted on the inner side of the ring seat installation groove, the upper portion of the drive ring seat (9) is slidably fitted with the ring seat on the inner side of the ring seat installation groove, the lower portion of the ring seat installation groove is threadedly connected to a limiting ring seat (11), the lower portion of the drive ring seat (9) is slidably fitted with the top side of the limiting ring seat (11), the lower portion of the drive ring seat (9) is provided with a mounting groove (14), and the fastening sleeve (10) is mounted in a mounting groove (14) in a mounting manner.

7. A hollow hydraulic tensioner according to claim 6, characterized in that: The driving worm (8) is rotatably mounted on the side of the bottom sleeve (7); an engaging tooth groove (13) is provided on the upper circumference of the driving ring seat (9); the upper part of the driving ring seat (9) is meshedly connected with the worm section in the middle of the driving worm (8) via the engaging tooth groove (13); and a hexagonal socket is provided at the end of the driving worm (8).

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