Non-circular section hydraulic stretcher oil cylinder

Abstract

The utility model relates to the technical field of stretcher oil cylinders, and discloses a non-circular-section hydraulic stretcher oil cylinder which is characterized in that a movable inner cylinder is of an oval structure, the movable inner cylinder is movably installed in an outer cylinder base, a fastening tooth column is installed on the side of a fastening sleeve in a meshed mode under driving of a driving shaft column, and the fastening sleeve is sleeved with a fastening sleeve. The movable inner cylinder is of an oval structure, the oval face side of the movable inner cylinder right faces a mounting gap of a bolt, the oval structure is adopted under the same interval, the cross section area of the oil cylinder can be increased, the oil pressure in an oil way can be reduced by increasing the end face area of the movable inner cylinder during working, and a tooth column type fastening driving structure is adopted. The fastening tooth column is arranged on the side of the support cylinder base, the fastening tooth column and the peripheral side of the fastening cylinder sleeve are installed in a meshed mode, after bolt stretching is completed, tightening installation of the nut can be completed only by screwing the driving shaft column, driving is driven through axial screwing, and the nut is not limited by a notch and a working structure; the operation is more convenient; and the tightening working efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of stretcher oil cylinders, and specifically relates to a non-circular-section hydraulic stretcher oil cylinder. Background Technique

[0002] Nuts and bolts are indispensable combined parts in the industrial field and are the most commonly used and firm combined parts. The hydraulic bolt stretcher is a tool used to tighten or disassemble large-diameter bolts that bear large acting forces. It includes a support frame, an oil cylinder, a piston slidably fitted in the oil cylinder, and a tubing joint provided on the piston. During operation, the oil pressure generated by a high-pressure oil pump is used to push the piston, which serves as a stretching body, to stretch the bolt, providing a tensile force in the axial direction of the bolt, so as to facilitate the loosening or tightening operation of the nut. It is an important auxiliary tool for bolt installation.

[0003] The operation of the stretcher relies on the inner cylinder plug column to provide driving force. The working oil pressure of the oil cylinder is related to the end area of the plug column. Under the same external pressure, the larger the area of the plug column, the smaller the oil pressure in the pipeline. A smaller oil pressure environment is beneficial to the service life and working stability of the pipeline. The plug columns of traditional stretchers are mostly circularly arranged. Limited by the installation spacing of bolts, the diameter of the plug column cannot be designed to be large. Due to the diameter limitation, the working oil pressure of existing stretchers is generally high. And when tightening the nut, existing stretchers mostly adopt the method of alternately tightening through a clamping wrench with a side opening. Limited by the opening, the single rotation angle is small, and multiple rotations are required to complete the nut tightening, which is very inconvenient to use. Therefore, a non-circular-section hydraulic stretcher oil cylinder is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a non-circular-section hydraulic stretcher oil cylinder to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A non-circular-section hydraulic stretcher oil cylinder includes a cylinder body mechanism and a fastening mechanism for the stretching and installation of the bolt body. The cylinder body mechanism is used for the stretching drive of the bolt body. The cylinder body mechanism includes an external cylinder seat, a movable inner cylinder, and a support cylinder seat. The movable inner cylinder is arranged in an oval structure, the movable inner cylinder is movably installed inside the external cylinder seat, and the support cylinder seat is installed at the lower part of the external cylinder seat;

[0006] The fastening mechanism is used for the fastening drive of the nut on the upper part of the bolt body. The fastening mechanism includes a connecting sleeve, a fastening sleeve, fastening tooth columns, and a driving shaft column. The connecting sleeve is movably installed at the upper part of the external cylinder seat, the fastening sleeve is rotatably and fittingly installed inside the support cylinder seat, and the fastening tooth columns are meshingly installed on the side of the fastening sleeve under the drive of the driving shaft column.

[0007] Preferably, an elliptical sliding cavity is provided inside the external cylinder seat, the elliptical sliding cavity is adapted to the movable inner cylinder, the movable inner cylinder is slidably mounted on the inner side of the elliptical sliding cavity, and a sealing ring is provided on the lower circumference of the movable inner cylinder.

[0008] Preferably, an oil supply interface is provided on the side of the external cylinder seat, and the oil supply interface is communicated with the lower part of the elliptical sliding cavity.

[0009] Preferably, a circular through hole is provided in the middle of the movable inner cylinder, an annular groove is provided on the upper opening side of the circular through hole, a positioning convex ring is provided at the lower part of the connecting sleeve, the positioning convex ring is aligned with the annular groove, a connecting screw hole is provided in the middle part of the connecting sleeve, and the connecting sleeve is threadedly connected to the upper part of the bolt body through the connecting screw hole.

[0010] Preferably, the lower portion of the external cylinder seat is provided with a mounting groove, the upper portion of the support tube seat is provided with a mounting ring seat, the mounting ring seat is aligned and embedded in the inner side of the mounting groove, the outer peripheral side of the external cylinder seat is evenly provided with fastening bolts, and the support tube seat is fixedly installed at the lower portion of the external cylinder seat by fastening bolts.

[0011] Preferably, a sleeve installation groove is provided in the middle of the support sleeve, and the fastening sleeve is rotatably embedded in the inner side of the sleeve installation groove. A nut embedding groove is penetrated in the middle of the fastening sleeve, and the fastening sleeve is mounted on the outside of the nut of the bolt body through the nut embedding groove.

[0012] Preferably, the driving shaft column is rotatably mounted on the side of the movable inner cylinder, the fastening tooth column is fixedly mounted on the lower part of the driving shaft column, the outer peripheral side of the fastening sleeve is evenly provided with meshing tooth grooves, the fastening sleeve is meshed and connected with the fastening tooth column through the meshing tooth grooves, and the upper end of the driving shaft column 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 an elliptical oil cylinder structure and an elliptical structural setting for the movable inner cylinder. The elliptical side of the movable inner cylinder faces the installation gap of the bolt. The elliptical structure can increase the cross-sectional area of ​​the oil cylinder under the same spacing. By increasing the end surface area of ​​the movable inner cylinder, the oil pressure in the oil circuit during operation can be reduced, so that the working stability of the tensioner is greatly improved. In addition, a tooth column type fastening drive structure is adopted. A fastening tooth column is arranged on the side of the support cylinder seat. The fastening tooth column is meshed and installed with the outer peripheral side of the fastening cylinder sleeve. After the bolt is stretched, the nut can be tightened and installed by twisting the drive shaft column. The drive is driven by axial screwing and will not be restricted by the notch and the working structure. The operation is more convenient and has higher tightening work efficiency. 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 drawings required for the description of the embodiments or the prior art. Obviously, the 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 drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the overall installation structure of the present utility model;

[0017] Figure 2 Schematic diagram of the upper part of the overall split structure of the present utility model;

[0018] Figure 3 Schematic diagram of the lower part of the overall split structure of the present utility model;

[0019] Figure 4 Schematic diagram of the internal sectional structure of the cylinder seat of the present utility model;

[0020] Figure 5 Schematic diagram of the installation structure of the fastening cylinder sleeve and the fastening tooth column of the present utility model.

[0021] Explanation of the reference numerals in the drawings: 1. Bolt body; 2. External cylinder seat; 3. Movable inner cylinder; 4. Support cylinder seat; 5. Oil supply interface; 6. Connecting cylinder sleeve; 7. Fastening cylinder sleeve; 8. Fastening tooth column; 9. Driving shaft column. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the 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 of protection of the present utility model.

[0023] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are 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 a substantial technical meaning. 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 can be covered by the technical content disclosed in the present application.

[0024] Embodiment

[0025] Please refer to Figures 1-5, the present utility model provides a technical solution: a non-circular cross-section hydraulic tensioner cylinder, which includes a cylinder body mechanism and a fastening mechanism for the stretching and installation of the bolt body 1. The cylinder body mechanism is used for the stretching drive of the bolt body 1. The cylinder body mechanism includes an external cylinder seat 2, a movable inner cylinder 3, and a support cylinder seat 4. The movable inner cylinder 3 is used for the jacking and stretching drive of the bolt. As shown in the attached Figure 2 , the movable inner cylinder 3 is arranged in an oval structure. The elliptical side of the movable inner cylinder 3 faces the installation gap of the bolt. The use of an oval structure at the same spacing can increase the cross-sectional area of the cylinder. By increasing the end face area of the movable inner cylinder 3, the oil pressure in the oil circuit during operation can be reduced. At the same load pressure, the oil pressure in the oil circuit is lower, which can reduce the pressure on the oil circuit seals and the heating rate of the oil, greatly improving the working stability of the tensioner. In order to install and connect the movable inner cylinder 3, an oval sliding cavity is provided inside the external cylinder seat 2. The oval sliding cavity is adapted to the movable inner cylinder 3, and the movable inner cylinder 3 is slidably installed inside the oval sliding cavity. In order to improve the oil tightness of the oil below the movable inner cylinder 3, a sealing ring is provided on the lower peripheral side of the movable inner cylinder 3. In order to connect and install with an external oil supply device, an oil supply interface 5 is provided on the side of the external cylinder seat 2, and the oil supply interface 5 is communicated with the lower part of the oval sliding cavity.

[0026] The fastening mechanism is used for the fastening drive of the nut on the upper part of the bolt body 1. The fastening mechanism includes a connecting sleeve 6, a fastening sleeve 7, a fastening tooth column 8, and a driving shaft column 9. The support cylinder seat 4 is used for the installation and support of the whole device. The support cylinder seat 4 is installed at the lower part of the external cylinder seat 2. In order to install and connect the support cylinder seat 4, as shown in the attached Figure 4 , an installation groove is provided at the lower part of the external cylinder seat 2. An installation ring seat is provided at the upper part of the support cylinder seat 4. The installation ring seat is fitted and installed inside the installation groove in alignment. Fastening bolts are evenly arranged on the outer peripheral side of the external cylinder seat 2. The support cylinder seat 4 is fixedly installed at the lower part of the external cylinder seat 2 through the fastening bolts.

[0027] The connecting sleeve 6 is used for the fastening installation with the upper part of the bolt body 1. The connecting sleeve 6 is movably installed at the upper part of the external cylinder seat 2. As shown in the attached Figure 2 , a circular through hole is provided in the middle of the movable inner cylinder 3. An annular groove is provided on the upper opening side of the circular through hole. A positioning convex ring is provided at the lower part of the connecting sleeve 6. The positioning convex ring is fitted and installed in alignment with the annular groove. In order to fasten and install with the upper part of the bolt body 1, a connecting screw hole is provided in the middle of the connecting sleeve 6. The connecting sleeve 6 is threadedly connected to the upper part of the bolt body 1 through the connecting screw hole.

[0028] The fastening sleeve 7 is used for screwing and fastening the nut. In order to connect and install the fastening sleeve 7, as shown in the attached Figure 4As shown, a sleeve installation groove is provided in the middle of the support sleeve 4, and the fastening sleeve 7 is rotatably fitted and installed on the inner side of the sleeve installation groove. In order to cooperate with the nut for installation, a nut embedding groove is provided through the middle of the fastening sleeve 7. The fastening sleeve 7 is fitted on the outside of the nut of the bolt body 1 through the nut embedding groove. The fastening sleeve 7 has various specifications and can be installed in cooperation with different types of nuts.

[0029] The drive shaft column 9 is used to fasten the support installation and screw drive of the gear column 8. Figure 2 As shown, the drive shaft column 9 is rotatably mounted on the side of the movable inner cylinder 3, and the fastening tooth column 8 is fixedly mounted on the lower part of the drive shaft column 9. In order to connect and install with the fastening tooth column 8, as shown in the attached Figure 5 As shown, meshing teeth are evenly arranged on the outer peripheral side of the fastening sleeve 7, and the fastening sleeve 7 is meshed with the fastening tooth column 8 through the meshing tooth grooves. The fastening tooth column 8 is meshed and installed on the side of the fastening sleeve 7 under the drive of the driving shaft column 9. After the bolt is stretched, the nut can be tightened and installed by simply turning the driving shaft column 9. The drive is driven by axial screwing and will not be restricted by the notch and the working structure. The operation is more convenient and has higher tightening work efficiency. In order to facilitate cooperation with external fastening tools, a hexagonal socket is provided at the upper end of the driving shaft column 9.

[0030] Working principle or structural principle, when working, select the connecting sleeve 6 and the fastening sleeve 7 that match the bolt, first align and fit the fastening sleeve 7 into the inside of the fastening tooth column 8, then put the device as a whole on the outside of the bolt and align the fastening sleeve 7 with the nut of the bolt, then install the connecting sleeve 6 on the upper part of the bolt by screwing, then tighten the connecting sleeve 6 and align the lower part of the connecting sleeve 6 with the groove on the upper part of the external cylinder seat 2, then install the external oil supply pipeline on the upper part of the oil supply interface 5, then Start the external driving oil pump and drive the movable inner cylinder 3 by supplying oil. Under the lifting action of the movable inner cylinder 3, the connecting sleeve 6 pulls and stretches the upper part of the bolt. After a period of stretching, the driving shaft column 9 is screwed by the hexagonal tightening tool. The driving shaft column 9 drives the tightening tooth column 8 to rotate. Driven by the tightening tooth column 8, the tightening sleeve 7 drives the nut to rotate to complete the screwing and tightening of the nut. Through multiple stretching and tightening, the stretched and tightened installation of the bolt is completed. After that, the oil pressure is released and the device is disassembled and removed as a whole to complete the stretching operation.

[0031] In summary, the present hydraulic tensioner adopts an elliptical oil cylinder structure, and the movable inner cylinder 3 is provided with an elliptical structure. The elliptical side of the movable inner cylinder 3 faces the installation clearance of the bolt. The elliptical structure can increase the cross-sectional area of the oil cylinder at the same spacing. By increasing the end face area of the movable inner cylinder 3, the oil pressure in the oil circuit during operation can be reduced, greatly improving the working stability of the tensioner. In addition, a tooth column type fastening drive structure is adopted. A fastening tooth column 8 is arranged on the side of the support cylinder base 4. The fastening tooth column 8 is meshed and installed with the outer peripheral side of the fastening sleeve 7. After the bolt is stretched, only by turning the drive shaft column 9 can the tightening installation of the nut be completed. The drive is through axial screwing, not restricted by the notch and the working structure, and the operation is more convenient and has a higher tightening work efficiency.

[0032] Those skilled in the art can understand that the features recited in the various embodiments and / or claims of the present invention can be combined or / and combined in various ways, even if such combinations or combinations are not explicitly recited in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features recited in the various embodiments and / or claims of the present invention can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A non-circular cross-section hydraulic tensioner cylinder, comprising a cylinder mechanism and a fastening mechanism for tensioning and installing a bolt body (1), characterized in that: The cylinder mechanism is used for stretching and driving the bolt body (1), and comprises an external cylinder seat (2), a movable inner cylinder (3) and a support cylinder seat (4); the movable inner cylinder (3) is an elliptical structure, the movable inner cylinder (3) is movably mounted inside the external cylinder seat (2), and the support cylinder seat (4) is mounted on the lower part of the external cylinder seat (2); The fastening mechanism is used for fastening and driving the nut on the upper part of the bolt body (1), and comprises a connecting sleeve (6), a fastening sleeve (7), a fastening tooth column (8) and a driving shaft column (9). The connecting sleeve (6) is movably mounted on the upper part of the external cylinder seat (2), the fastening sleeve (7) is rotatably mounted in the interior of the support sleeve (4), and the fastening tooth column (8) is meshedly mounted on the side of the fastening sleeve (7) under the drive of the driving shaft column (9).

2. A non-circular cross-section hydraulic tensioner cylinder according to claim 1, characterized in that: An elliptical sliding cavity is provided inside the outer cylinder seat (2), the elliptical sliding cavity is adapted to the movable inner cylinder (3), the movable inner cylinder (3) is slidably mounted on the inner side of the elliptical sliding cavity, and a sealing ring is provided on the lower circumference of the movable inner cylinder (3).

3. A non-circular cross-section hydraulic tensioner cylinder according to claim 2, characterized in that: An oil supply interface (5) is provided on the side of the external cylinder seat (2), and the oil supply interface (5) is communicated with the lower part of the elliptical sliding cavity.

4. The non-circular cross-section hydraulic tensioner cylinder according to claim 1, characterized in that: A circular through hole is provided in the middle of the movable inner cylinder (3), an annular embedding groove is provided on the upper opening side of the circular through hole, a positioning convex ring is provided at the lower part of the connecting sleeve (6), the positioning convex ring is aligned and embedded in the annular embedding groove, a connecting screw hole is provided in the middle part of the connecting sleeve (6), and the connecting sleeve (6) is threadedly connected to the upper part of the bolt body (1) through the connecting screw hole.

5. A non-circular cross-section hydraulic tensioner cylinder according to claim 4, characterized in that: The lower part of the external cylinder seat (2) is provided with a mounting groove, the upper part of the support tube seat (4) is provided with a mounting ring seat, the mounting ring seat is mounted in alignment with the inner side of the mounting groove, the outer peripheral side of the external cylinder seat (2) is evenly provided with fastening bolts, and the support tube seat (4) is fixedly mounted on the lower part of the external cylinder seat (2) by means of the fastening bolts.

6. A non-circular cross-section hydraulic tensioner cylinder according to claim 5, characterized in that: A sleeve installation groove is provided in the middle of the support sleeve seat (4), and the fastening sleeve (7) is rotatably mounted on the inner side of the sleeve installation groove. A nut embedding groove is provided through the middle of the fastening sleeve (7), and the fastening sleeve (7) is mounted on the outside of the nut of the bolt body (1) through the nut embedding groove.

7. A non-circular cross-section hydraulic tensioner cylinder according to claim 6, characterized in that: The driving shaft column (9) is rotatably mounted on the side of the movable inner cylinder (3), the fastening tooth column (8) is fixedly mounted on the lower part of the driving shaft column (9), the outer peripheral side of the fastening sleeve (7) is evenly provided with meshing tooth grooves, the fastening sleeve (7) is meshed and connected with the fastening tooth column (8) through the meshing tooth grooves, and the upper end of the driving shaft column (9) is provided with a hexagonal socket.

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