Flat type hydraulic tensioner

Abstract

A flat type hydraulic tensioner comprises a cylinder body, a first installation hole is machined in the cylinder body, a cylinder sleeve is arranged in the first installation hole, the cylinder sleeve and the cylinder body are sealed through a sealing ring, an oil inlet connector is installed on the side face of the cylinder body, the oil inlet connector is communicated with the cylinder sleeve and the cylinder body, a second installation hole is machined in the cylinder sleeve, and a stretching sleeve is arranged in the second installation hole. A shifting ring is arranged at the bottom in the cylinder body, a shifting groove is formed in the side face of the bottom of the cylinder body, an avoiding groove is reserved in the shifting ring and the side face of the cylinder body, a plurality of tension springs are arranged in the avoiding groove, one end of each tension spring is connected with the bottom of the cylinder sleeve, and the other end of each tension spring is connected with the side face of the cylinder body. A locking screw is arranged on the side face of the upper end of the cylinder body and penetrates through the cylinder body to be clamped into the annular groove. The height of the tensioner is reduced, so that the tensioner is more convenient to carry and can be suitable for installation of bolts in narrow and small areas.

Description

Technical Field

[0001] The utility model relates to the technical field of stretchers, in particular to a flat hydraulic stretcher. Background Art

[0002] Existing hydraulic stretchers mainly include a cylinder block, a cylinder liner and a stretching sleeve. The cylinder liner is arranged in the cylinder block, and the stretching sleeve is arranged in the cylinder liner. For example, a Chinese patent with the publication number CN216066324U and the name of "a bolt stretcher" includes a cylinder block. A support bridge is connected to the bottom of the cylinder block, and a piston is arranged in the cylinder block; a stretching sleeve is arranged in the piston, and a connecting disc is installed above the cylinder block. The stretching sleeve passes through the connecting disc; guide posts are evenly distributed above the piston, and the guide posts pass through the connecting disc; a return spring is sleeved on the guide posts, and the cylinder liner is reset by the return spring. The stretcher with this structure has a baffle and a return spring installed above the cylinder block, so the overall height of the stretcher is relatively high and it cannot be applied to a narrow installation space. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a flat hydraulic stretcher aiming at the above-mentioned deficiencies of the existing technology.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is:

[0005] A flat hydraulic stretcher includes a cylinder block. An installation hole one is machined in the cylinder block. A cylinder liner is arranged in the installation hole one. The cylinder liner and the cylinder block are sealed by a sealing ring. An oil inlet joint is installed on the side of the cylinder block. The oil inlet joint is communicated with the space between the cylinder liner and the cylinder block through an internal hydraulic oil pipeline. An installation hole two is machined in the cylinder liner. A stretching sleeve is arranged in the installation hole two. A shifting ring is arranged at the bottom inside the cylinder block. A shifting groove is formed on the side of the bottom of the cylinder block. A clearance groove is reserved between the shifting ring and the side of the cylinder block. A plurality of tension springs are arranged in the clearance groove. One end of the tension spring is connected to the bottom of the cylinder liner, and the other end of the tension spring is connected to the side of the cylinder block. An annular groove is machined on the upper side of the cylinder liner. A locking screw is arranged on the upper side of the cylinder block. The locking screw passes through the cylinder block and is clamped into the annular groove.

[0006] Further, a connecting ring is machined at the bottom of the cylinder liner. A connecting hole is machined on the connecting ring. One end of the tension spring is hooked in the connecting hole. Connecting screws are installed on the inner wall of the cylinder block. The other end of the tension spring is hooked on the connecting screws.

[0007] Further, both the installation hole one and the installation hole two are stepped holes.

[0008] Further, the stretching sleeve adopts a nut structure, and a rotating hole is machined on the surface of the nut.

[0009] Further, a shifting hole is machined on the side of the shifting ring.

[0010] Further, the locking screw is a knurled hand-tightening screw.

[0011] Compared with the prior art, in a flat hydraulic tensioner of the present utility model, the return spring above the cylinder block is changed to below the cylinder block, the original cover plate is cancelled, and the stretching sleeve is changed to a nut structure, reducing the height of the tensioner and making it more convenient to carry, and it can be applicable to the installation of bolts in narrow areas. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Wherein, 1. Cylinder block, 2. Cylinder sleeve, 3. Oil inlet joint, 4. Stretching sleeve, 5. Dial ring, 6. Dialing groove, 7. Pulling spring, 8. Annular groove, 9. Locking screw, 10. First sealing ring, 11. Second sealing ring, 12. Rotating hole, 13. Dialing hole, 14. Connecting ring, 15. Connecting screw. Specific Embodiments

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described.

[0015] As Figure 1 shown, a flat hydraulic tensioner includes a cylinder block 1. An installation hole one is machined in the cylinder block 1. A cylinder sleeve 2 is arranged in the installation hole one. The cylinder sleeve 2 and the cylinder block 1 are sealed through a sealing ring. An oil inlet joint 3 is installed on the side of the cylinder block 1. The oil inlet joint 3 is communicated with the area between the cylinder sleeve 2 and the cylinder block 1 through an internal hydraulic oil pipeline to inject hydraulic oil into the sealed area between the cylinder sleeve 2 and the cylinder block 1. An installation hole two is machined in the cylinder sleeve 2. A stretching sleeve 4 is arranged in the installation hole two. The stretching sleeve 4 is screwed onto the bolt. A dial ring 5 is arranged at the bottom inside the cylinder block 1. The dial ring 5 is sleeved on the installation nut. A dialing groove 6 is opened on the side of the bottom of the cylinder block 1. The dial ring 5 is dialed through a tool at the dialing groove 6. A relief groove is reserved between the dial ring 5 and the side of the cylinder block 1. A plurality of pulling springs 7 are arranged in the relief groove. One end of the pulling spring 7 is connected to the bottom of the cylinder sleeve 2, and the other end of the pulling spring 7 is connected to the side of the cylinder block 1. The cylinder sleeve 2 is reset after use through the pulling spring 7. An annular groove 8 is machined on the upper side of the cylinder sleeve 2. A locking screw 9 is arranged on the upper side of the end of the cylinder block 1. When the tensioner is not in use, the locking screw 9 passes through the cylinder block 1 and is clamped into the annular groove 8 to fix the cylinder sleeve 2.

[0016] In this embodiment, mounting hole 1 and mounting hole 2 are both stepped holes, and a first sealing ring 10 and a second sealing ring 11 are arranged between the cylinder liner 2 and the cylinder body 1. The first sealing ring 10 is located below the stepped surface of mounting hole 1, and the first sealing ring 10 is embedded in the side wall of the cylinder body 1. The second sealing ring 11 is located above the stepped surface of mounting hole 1, and the second sealing ring 11 is sleeved on the cylinder liner 2. The stretching sleeve 4 adopts a nut structure, and the stretching sleeve 4 is supported on the stepped surface of the mounting hole, and a rotating hole 12 is processed on its surface to facilitate the tool to rotate the stretching sleeve 4. The side of the shifting ring 5 is processed with a shifting hole 13 to facilitate the tool to shift the shifting ring 5. The locking screw 9 adopts a knurled hand screw to facilitate manual tightening of the locking screw 9.

[0017] In this embodiment, 6 to 8 tension springs 7 are arranged in the avoidance groove, wherein a connecting ring 14 is processed at the bottom of the cylinder liner 2, a connecting hole is processed on the connecting ring 14, one end of the tension spring 7 is hooked in the connecting hole, a connecting screw 15 is installed on the inner wall of the cylinder body 1, and the other end of the tension spring 7 is hooked on the connecting screw 15. When the tensioner is used, the cylinder liner 2 is reset under the action of the tension spring 7.

[0018] The present invention is not limited to the described embodiments. Those skilled in the art may make some modifications or changes without departing from the spirit and scope of the present invention, that is, within the scope of disclosure. Therefore, the scope of protection of the present invention shall be subject to the scope defined in the claims.

Claims

1. A flat hydraulic tensioner, comprising a cylinder body, a mounting hole 1 is processed in the cylinder body, a cylinder sleeve is arranged in the mounting hole 1, the cylinder sleeve and the cylinder body are sealed by a sealing ring, an oil inlet joint is installed on the side of the cylinder body, the oil inlet joint is connected with the cylinder sleeve and the cylinder body through an internal hydraulic oil pipeline, a mounting hole 2 is processed in the cylinder sleeve, a stretching sleeve is arranged in the mounting hole 2, a pull ring is arranged at the bottom of the cylinder body, and a pull groove is opened on the side of the bottom of the cylinder body, characterized in that: An avoidance groove is reserved between the shift ring and the side of the cylinder body, and a plurality of tension springs are arranged in the avoidance groove. One end of the tension spring is connected to the bottom of the cylinder sleeve, and the other end of the tension spring is connected to the side of the cylinder body. An annular groove is processed on the upper side of the cylinder sleeve, and a locking screw is arranged on the upper side of the cylinder body. The locking screw passes through the cylinder body and is inserted into the annular groove.

2. A flat hydraulic tensioner according to claim 1, characterized in that: A connecting ring is processed at the bottom of the cylinder sleeve, a connecting hole is processed on the connecting ring, one end of the tension spring is hooked in the connecting hole, a connecting screw is installed on the inner wall of the cylinder body, and the other end of the tension spring is hooked on the connecting screw.

3. A flat hydraulic tensioner according to claim 1, characterized in that: The mounting hole 1 and the mounting hole 2 are both step holes.

4. A flat hydraulic tensioner according to claim 1, characterized in that: The stretch sleeve adopts a nut structure, and a rotation hole is processed on the surface of the nut.

5. A flat hydraulic tensioner according to claim 1, characterized in that: A shifting hole is processed on the side surface of the shifting ring.

6. A flat hydraulic tensioner according to claim 1, characterized in that: The locking screw is a knurled thumb screw.

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