Lateral-force-resistant tensioning hydraulic cylinder

Abstract

The lateral-force-resistant tensioning hydraulic cylinder comprises a cylinder barrel, a piston rod and a sealing piece, a cylindrical hole used for installing the piston rod is formed in the center of the cylinder barrel, an oil inlet and outlet hole used for being communicated with the cylindrical hole is formed in the side wall of the cylinder barrel, a groove used for installing the sealing piece is formed in the inner wall of the cylindrical hole, and the width of the groove is larger than that of the sealing piece. The sealing piece is installed in the groove, copper rings are arranged in gaps between the two sides of the sealing piece and the groove in a surfacing mode, the piston rod is installed in the cylindrical hole with the sealing piece and the copper rings in a sliding mode, the copper rings make contact with the piston rod and serve as sliding supports, the cylinder barrel is of a square structure, and the cylinder barrel can bear larger bending moment and lateral force in appearance. In the installation process, the cylinder barrel can be directly pushed into a main engine structural part, an anti-rotation limiting plate does not need to be designed for a main engine, the cylinder barrel is suitable for being used in a narrow installation space, lateral force in the movement process of the rod body can be counteracted through the arrangement of the copper ring, and installation and maintenance are easy.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic devices, and in particular relates to a lateral force-resisting tensioning hydraulic cylinder. Background Art

[0002] The built-in tensioning hydraulic cylinder installed in the crawler structure often encounters the problem of dust extrusion. Analysis shows that the original hydraulic cylinder is insufficient to resist lateral force during use, resulting in excessive gap on one side of the dustproof and extrusion. At the same time, the original hydraulic cylinder has a complex structure and faces the problem of insufficient space when installed in the narrow space of the main machine.

[0003] The existing oil cylinder structure is a conventional plunger hydraulic cylinder, such as Figure 1 As shown, the cylinder barrel has a circular shape, and the main engine needs to be installed through the pin hole at the bottom of the cylinder barrel fixed with the pin shaft. There is only one supporting ring on the inside of the cylinder barrel as a support to resist the lateral force. At the same time, when the track structure is installed, the welding space of the external oil pipe and the flange is small, and it is not easy to ensure the welding quality. Under high-frequency vibration and oil impact conditions, weld oil leakage is likely to occur. When subjected to lateral force, the weld is a weak point, which affects the weld life, thereby resulting in a low service life of the conventional plunger hydraulic cylinder. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a lateral force tensioning hydraulic cylinder, which is installed on the inner side of the track structure to play the role of track tensioning. By reasonably designing the hydraulic cylinder structure, the purposes of lateral force resistance, high reliability, and easy installation and maintenance are achieved. The lateral force tensioning hydraulic cylinder comprises: a cylinder barrel, a piston rod, a seal, a limit plate, and a lifting ear screw. The cylinder barrel design with an inner circle and an outer square increases the outer side's bending moment and lateral force resistance capabilities, and the inner side welding forms a copper ring to increase the inner side rod body's lateral force resistance capabilities. By optimizing the design of the process hole structure on the cylinder barrel, a threaded process plug is screwed in, and the internal oil pressure acts on the threaded process plug, so that the outer welding part of the process plug is only used as a seal, without oil pressure shock, thereby improving reliability. The anti-blowout limit lifting structure can realize the function of limiting the extension of the piston rod when the cylinder is fully retracted, and the lifting ear screw can realize the transfer lifting function.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hydraulic cylinder for resisting lateral force tensioning, comprising: a cylinder barrel, a piston rod, and a seal, wherein a cylindrical hole for installing the piston rod is provided in the center of the cylinder barrel, and an oil inlet and outlet hole for connecting with the cylindrical hole is provided on the side wall of the cylinder barrel, and a groove for installing the seal is provided on the inner wall of the cylindrical hole, wherein the width of the groove is greater than the width of the seal, the seal is installed in the groove, and a copper ring is welded on both sides of the seal and the gap between the groove, and the piston rod is slidably installed in the cylindrical hole with the seal and the copper ring, and the copper ring contacts the piston rod and serves as a sliding support.

[0006] Furthermore, the cylindrical hole is a stepped cylindrical hole, and the diameter of the cylindrical hole near the cylinder bottom in the stepped cylindrical hole is larger than the diameter of the cylindrical hole far from the cylinder bottom.

[0007] Furthermore, the oil inlet and outlet holes are connected to the cylindrical hole of the stepped cylindrical hole near the cylinder bottom through the oil channel in the cylinder barrel.

[0008] Furthermore, the oil passage in the cylinder is composed of two intersecting gun-drilled holes and a plug with a thread. The two intersecting gun-drilled holes are gun-drilled hole A and gun-drilled hole B. Gun-drilled hole A is a hole directly connected to the cylindrical hole of the stepped cylindrical hole near the bottom of the cylinder from the outer wall of the cylinder, and gun-drilled hole B is a hole directly connected to gun-drilled hole A from the opening of the cylinder, and the oil inlet and outlet holes are directly connected to gun-drilled hole B from the outer wall of the cylinder; the openings of gun-drilled hole A and gun-drilled hole B are designed with countersunk threads, and the plug with a thread is installed at the thread, and the countersunk position is filled with welding wire.

[0009] Furthermore, the groove is arranged on the cylindrical hole at a position of the stepped cylindrical hole away from the cylinder bottom.

[0010] Furthermore, the piston rod is a cylinder, and a protrusion is provided at one end of the cylinder close to the cylinder bottom, and a milling flattened portion is provided at one end away from the cylinder bottom for fixing to the main machine structure.

[0011] Furthermore, the diameter of the cylindrical hole in the stepped cylindrical hole close to the cylinder bottom is greater than the diameter of the piston rod.

[0012] Furthermore, the length of the cylinder in the piston rod plus the length of the protrusion is less than or equal to the length of the cylindrical hole in the cylinder barrel for mounting the piston rod.

[0013] Furthermore, the anti-lateral force tensioning hydraulic cylinder also includes: a limit plate and a lifting ear screw. The limit plate is installed next to the opening of the cylindrical hole of the cylinder barrel through the lifting ear screw as needed, so that the limit plate blocks the piston rod when the piston rod is fully retracted. The limit plate is used to limit the extension of the piston rod when the piston rod is fully retracted, and the lifting ear screw is used for transportation and lifting.

[0014] Furthermore, the cylinder barrel is a square structure, and a cylindrical hole for mounting the piston rod is arranged at the center of the cylinder barrel.

[0015] The beneficial effects of the present invention are: (1) To resist lateral force, the square cylinder shape allows the cylinder to be directly pushed into the mainframe structure during installation, without the need for a limit plate to prevent rotation. The square surface has a larger contact area with the mainframe structure and can withstand greater bending moments and lateral forces. A copper ring is welded on the inside of the cylinder, which contacts the piston rod and acts as a sliding support to offset the lateral force during the movement of the rod. (2) High reliability. The gun-drilled holes in the oil channel are sealed with threaded plugs. The internal oil pressure acts on the threaded plugs. The welded part filled with welding wire on the outside of the threaded plugs is only used as a seal. There is no oil pressure shock in and out of the oil holes, which improves reliability. (3) Easy to install and maintain. There are no protruding welding parts on the outside of the cylinder to avoid bumps during assembly. At the same time, the structure is simple and does not require guide sleeves or small piston parts, making assembly and maintenance easy; (4) The limit lifting structure can limit the extension of the piston rod when the cylinder is fully retracted through the limit plate and the lifting eye screw. At the same time, the lifting eye screw can realize the transfer lifting function. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prior art; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 It is a side view structural schematic diagram of the present invention; Figure 4 for Figure 2 Schematic diagram of partial enlarged structure; In the figure: 1. Cylinder; 2. Piston rod; 3. Seal; 4. Limit plate; 5. Lifting ear screw; 6. Gun drill hole A; 7. Gun drill hole B; 8. Oil inlet and outlet holes; 9. Plug. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] like Figure 2-4 As shown, a lateral force-resistant tensioning hydraulic cylinder comprises: a cylinder barrel 1, a piston rod 2, and a sealing member 3. A cylindrical hole is provided at the center of the cylinder barrel 1 for installing the piston rod 2. An oil inlet and outlet hole 8 for communicating with the cylindrical hole is provided on the side wall of the cylinder barrel 1. A groove is provided on the inner wall of the cylindrical hole for installing the sealing member 3, wherein the width of the groove is greater than the width of the sealing member 3. The sealing member 3 is installed in the groove. Copper rings are welded on both sides of the sealing member 3 and the gap between the groove. The piston rod 2 is slidably installed in the cylindrical hole with the seal 3 and the copper ring. The copper ring contacts the piston rod 2 and serves as a sliding support to offset the lateral force during the movement of the rod body.

[0020] like Figure 2 As shown, the cylindrical hole is a stepped cylindrical hole, and the diameter of the cylindrical hole near the cylinder bottom in the stepped cylindrical hole is larger than the diameter of the cylindrical hole far from the cylinder bottom.

[0021] like Figure 2-4 As shown, the oil inlet and outlet holes 8 are connected with the cylindrical hole of the stepped cylindrical hole near the bottom of the cylinder through the oil passage in the cylinder 1, wherein the oil passage in the cylinder 1 is composed of two intersecting gun drilled holes and a plug 9 with threads, the two intersecting gun drilled holes are gun drilled hole A6 and gun drilled hole B7 respectively, the gun drilled hole A6 is a hole directly connected with the cylindrical hole of the stepped cylindrical hole near the bottom of the cylinder from the outer wall of the cylinder 1, the gun drilled hole B7 is a hole directly connected with the gun drilled hole A6 from the opening of the cylinder 1, and the oil inlet and outlet holes 8 are directly connected with the gun drilled hole B7 from the outer wall of the cylinder 1; the openings of the gun drilled holes A6 and the gun drilled holes B7 are designed with countersunk threads, and the plug 9 with threads is installed at the threads, and the countersunk position is filled with welding wire. In this way, the internal oil pressure acts directly on the plug 9, and the welding part filled with welding wire on the outside is only used as a seal, so that the oil inlet and outlet holes 8 have no oil pressure shock, thereby improving reliability.

[0022] like Figure 2 As shown, the groove is arranged on the cylindrical hole at a position of the stepped cylindrical hole away from the cylinder bottom, so as to facilitate the guiding and sealing of the piston rod 2 when it is extended, thereby increasing the extension distance of the piston rod 2.

[0023] like Figure 2 As shown, the piston rod 2 is a cylinder, and a protrusion is provided at one end of the cylinder close to the cylinder bottom, and a milling flattening is provided at the end away from the cylinder bottom for fixing to the main machine structure. The protrusion is provided at one end of the cylinder close to the cylinder bottom, so that there is a gap between the cylinder and the cylinder bottom. The diameter of the cylindrical hole close to the cylinder bottom in the stepped cylindrical hole is larger than the diameter of the piston rod 2, so that there is a gap. When the hydraulic oil enters the inner side of the cylinder barrel 1, the hydraulic oil evenly fills each gap and then evenly fills the outer circle of the piston rod 2, which can increase the starting area of ​​the hydraulic cylinder and ensure that the piston rod 2 end is evenly stressed; the length of the cylinder in the piston rod 2 plus the length of the protrusion is less than or equal to the length of the cylindrical hole in the cylinder barrel 1 for installing the piston rod 2, so that the piston rod 2 can be fully retracted into the cylindrical hole, which is convenient for the use of the limit plate 4 later.

[0024] like Figure 2-3 As shown, the anti-lateral force tensioning hydraulic cylinder also includes: a limit plate 4 and a lifting ear screw 5. The limit plate 4 is installed next to the opening of the cylindrical hole of the cylinder barrel 1 through the lifting ear screw 5 as needed, so that the limit plate 4 blocks the piston rod 2 when the piston rod 2 is fully retracted. The limit plate 4 is used to limit the extension of the piston rod 2 when the piston rod 2 is fully retracted. The lifting ear screw 5 is used for transportation and lifting. A threaded hole for installing the lifting ear screw 5 is provided next to the opening of the cylindrical hole of the cylinder barrel 1.

[0025] like Figure 2-3 As shown, the cylinder 1 is a square structure, and the cylindrical hole for installing the piston rod 2 is set at the center of the cylinder 1. The square cylinder 1 can withstand greater bending moments and lateral forces. During the installation process, this cylinder 1 can be directly pushed into the main machine structure, and there is no need to design an anti-rotation limit plate 4 for the main machine, which is suitable for use in narrow installation spaces.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder for tensioning against lateral forces, characterized in that: include: Cylinder, piston rod, seal, the center of the cylinder is provided with a cylindrical hole for installing the piston rod, the side wall of the cylinder is provided with oil inlet and outlet holes for connecting with the cylindrical hole, the inner wall of the cylindrical hole is provided with a groove for installing the seal, wherein the width of the groove is greater than the width of the seal, the seal is installed in the groove, the gap between the two sides of the seal and the groove is welded with a copper ring, the piston rod is slidably installed in the cylindrical hole with the seal and the copper ring, the copper ring is in contact with the piston rod and serves as a sliding support.

2. The anti-lateral force tensioning hydraulic cylinder according to claim 1, characterized in that: The cylindrical hole is a stepped cylindrical hole, and the diameter of the cylindrical hole near the cylinder bottom in the stepped cylindrical hole is larger than the diameter of the cylindrical hole far from the cylinder bottom.

3. The anti-lateral force tensioning hydraulic cylinder according to claim 2, characterized in that: The oil inlet and outlet holes are connected with the cylindrical hole of the stepped cylindrical hole near the cylinder bottom through the oil passage in the cylinder barrel.

4. The anti-lateral force tensioning hydraulic cylinder according to claim 3, characterized in that: The oil passage in the cylinder is composed of two intersecting gun-drilled holes and a plug with a thread. The two intersecting gun-drilled holes are gun-drilled hole A and gun-drilled hole B. Gun-drilled hole A is a hole directly connected to the cylindrical hole of the stepped cylindrical hole near the bottom of the cylinder from the outer wall of the cylinder, and gun-drilled hole B is a hole directly connected to gun-drilled hole A from the opening of the cylinder, and the inlet and outlet oil holes are directly connected to gun-drilled hole B from the outer wall of the cylinder; countersunk threads are designed at the openings of gun-drilled holes A and gun-drilled holes B, and plugs with threads are installed at the threads, and the countersunk positions are filled with welding wire.

5. The anti-lateral force tensioning hydraulic cylinder according to claim 2, characterized in that: The groove is arranged on the cylindrical hole at a position where the stepped cylindrical hole is far away from the cylinder bottom.

6. The anti-lateral force tensioning hydraulic cylinder according to claim 2, characterized in that: The piston rod is a cylinder, one end of the cylinder close to the cylinder bottom is provided with a protrusion, and the other end away from the cylinder bottom is provided with a milling flattened part for fixing to the main machine structure.

7. The anti-lateral force tensioning hydraulic cylinder according to claim 6, characterized in that: The diameter of the cylindrical hole in the stepped cylindrical hole close to the cylinder bottom is larger than the diameter of the piston rod.

8. The anti-lateral force tensioning hydraulic cylinder according to claim 6, characterized in that: The length of the cylinder in the piston rod plus the length of the protrusion is less than or equal to the length of the cylindrical hole in the cylinder barrel for installing the piston rod.

9. The anti-lateral force tensioning hydraulic cylinder according to claim 8, characterized in that: Also includes: Limit plate and lifting ear screw. Install the limit plate beside the opening of the cylindrical hole of the cylinder through the lifting ear screw as needed, so that the limit plate blocks the piston rod when the piston rod is fully retracted. The limit plate is used to limit the extension of the piston rod when the piston rod is fully retracted, and the lifting ear screw is used for transportation and lifting.

10. The anti-lateral force tensioning hydraulic cylinder according to claim 1, characterized in that: The cylinder barrel is a square structure, and a cylindrical hole for installing the piston rod is arranged at the center of the cylinder barrel.

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