Anti-leakage sealing structure for hydraulic cylinders

Abstract

The utility model relates to a liquid leakage-proof sealing structure suitable for a hydraulic oil cylinder. The sealing joint (3) also comprises a connecting section (3-1), an inner tube (3-5) and a sealing pressure head (3-7). The center of the connecting section (3-1) is fixedly connected to the inner tube (3-5). The end of the inner tube (3-5) is conical. Three or four inner tube conical head protrusions (3-10) are arranged at equal intervals on the surface of the end of the conical inner tube (3-5). Two inner tube conical head protrusions (3-10) close to the conical end of the inner tube (3-5) are arranged on the surface of the conical end of the inner tube (3-5). The surface of the inner tube (3‑5) between the sealing head (3‑10) is provided with anti-leakage corrugations (3‑9); the threaded ring (3‑2) is threadedly connected to the connecting section (3‑1), the surface of the threaded ring (3‑2) is fixedly connected to one end of the connecting rod (3‑4), the other end of the connecting rod (3‑4) is fixedly connected to the pull ring (3‑6), and the pull ring (3‑6) is movably installed in an annular groove on the side of the sealing pressure head (3‑7). The utility model can effectively prevent the leakage of hydraulic oil and realize the rapid disassembly and assembly of the hydraulic pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a liquid leakage-proof sealing structure suitable for hydraulic oil cylinders. Background Art

[0002] When the hydraulic cylinder is installed and used, the hydraulic pipeline is usually connected to the cylinder body through a threaded interface. However, due to the processing accuracy and structural problems of the threaded interface itself, there are usually gaps between the threads. In order to ensure the sealing, sealing rings must be arranged on the outside and inside of the threaded interface. However, when a single or two sealing rings are used, hydraulic oil of 20 to 30 MPa will still leak, resulting in hydraulic oil waste and affecting the normal use of the hydraulic cylinder. At the same time, since the hydraulic pipeline needs to be threaded to the cylinder, the hydraulic pipeline needs to be rotated continuously for more than ten turns. During the installation process, the hydraulic pipeline will inevitably be distorted, affecting the performance of the pipeline itself.

[0003] At present, the utility model with patent number CN217463636U discloses a leakage-proof hydraulic cylinder joint, and particularly relates to a leakage-proof hydraulic cylinder joint, comprising a joint body which is tubular as a whole and a first sealing ring arranged on the end face of the joint body, a second sealing ring is arranged on the outer side of the tail of the joint body, and a sleeve is also sleeved on the outer side of the joint body, and the inner wall of the sleeve cooperates with the outer wall of the joint body to clamp the end of the hydraulic hose. When the joint is used, the inner wall of the sleeve cooperates with the outer wall of the joint body to clamp the end of the hydraulic hose, and a sealing surface is formed between the second sealing ring and the inner wall of the hydraulic hose. The sealing performance between the joint and the hydraulic hose is good, and the cross-section of the hydraulic hose will not be immersed in the interior of the hydraulic oil, the hydraulic hose will not leak internally, and the sealing performance of the entire device is good. This application proposal achieves sealing by clamping the wall of the hydraulic oil pipe through the interaction between the joint body and the sleeve, but the joint body and the sleeve themselves are not movable, and it is difficult for the user to evenly feed the wall of the hydraulic pipe into the cavity between the joint body and the sleeve. The overall operation is relatively cumbersome and not very convenient to use. At the same time, if disassembly is required, damage is inevitable when the hydraulic pipe is pulled out. If a small amount of hydraulic pipe remains in the cavity between the joint body and the sleeve, it will affect the secondary use. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a liquid leakage-proof sealing structure suitable for a hydraulic oil cylinder, which can effectively prevent hydraulic oil leakage and realize rapid disassembly and assembly of hydraulic pipelines.

[0005] In order to achieve the above-mentioned purpose, the utility model is applicable to a leakage-proof sealing structure of a hydraulic cylinder, including a telescopic rod, a cylinder body, a sealing joint, a connecting section, a threaded ring, a handle, a connecting rod, an inner tube, a pull ring, a sealing pressure head, a pressure head inner convexity, an anti-leakage corrugation, an inner tube cone head convexity, a pressure head annular groove, a ball, a pressure ring, the cylinder body is sleeved with the telescopic rod, and the sealing joint is welded and installed on the surface of the cylinder body. The sealing joint also includes a connecting section, an inner tube and a sealing pressure head. The inner tube is fixedly connected at the center of the connecting section, the end of the inner tube is conical, and three or four inner tube cone heads are arranged at equal intervals on the surface of the conical inner tube end. The inner tube surface between the two inner tube cone head convexities near the conical end of the inner tube is provided with anti-leakage corrugations; the threaded ring is threadedly connected to the connecting section, the threaded ring surface is fixedly connected to one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the pull ring, and the pull ring is movably installed in the annular groove on the side of the sealing pressure head, and the sealing pressure head is sleeved on the inner tube through the through hole opened on the central axis. The pressure head inner convexity on the inner side of the sealing pressure head gradually enlarges toward one side of the inner tube, and a pressure head annular groove corresponding to the inner tube cone head convex is provided on the inner surface, and the slope of the pressure head annular groove toward the side of the connecting section is smaller; the outer side of the threaded ring is threadedly connected to the handle.

[0006] In addition, the anti-liquid leakage sealing structure applicable to the hydraulic oil cylinder proposed in the above embodiment of the utility model may also have the following additional technical features:

[0007] As a further improvement of the present invention, a ball bearing is provided between the pull ring and the sealing pressure head.

[0008] As a further improvement of the utility model, the inner tube is sleeved with a pressure ring near the sealing pressure head.

[0009] As a further improvement of the utility model, the surface of the pressure ring is wrapped with rubber.

[0010] As a further improvement of the present invention, the diameter of the inner convex side of the sealing pressure head gradually increases toward the outside.

[0011] Through the above scheme, the utility model has at least the following advantages: compared with the conventional hydraulic cylinder connecting head sealing structure, the distance between the sealing pressure head and the inner tube is controlled by the threaded ring, the connecting rod and the pull ring, and the sealing pressure head and the conical structure inside the inner tube are matched, so that the sealing pressure head and the inner tube can clamp the pipe wall of the hydraulic pipe to achieve sealing, which can effectively prevent the leakage of hydraulic oil and realize the rapid disassembly and assembly of the hydraulic pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of a liquid-leakage-proof sealing structure applicable to a hydraulic cylinder;

[0013] Figure 2 It is a three-dimensional diagram of a sealing joint of a liquid-leakage-proof sealing structure suitable for a hydraulic cylinder;

[0014] Figure 3 It is a top view cross-sectional view of a sealing joint of a leak-proof sealing structure suitable for a hydraulic cylinder;

[0015] Figure 4 yes Figure 3 A partial enlarged view of middle A;

[0016] Figure 5 It is a top view cross-sectional view of a sealing joint installation pressure ring of a leak-proof sealing structure suitable for a hydraulic cylinder;

[0017] In the figure: 1, telescopic rod, 2, cylinder body, 3, sealing joint, 3-1, connecting section, 3-2, threaded ring, 3-3, handle, 3-4, connecting rod, 3-5, inner tube, 3-6, pull ring, 3-7, sealing pressure head, 3-8, pressure head inner convex, 3-9, anti-leakage corrugation, 3-10, inner tube cone head convex, 3-11, pressure head annular groove, 3-12, ball, 3-13, pressure ring. DETAILED DESCRIPTION

[0018] The anti-liquid leakage sealing structure applicable to the hydraulic oil cylinder of the utility model is described below in conjunction with the accompanying drawings.

[0019] In the first embodiment of the present application, Figures 1 to 4As shown, the present invention is applicable to the anti-leakage sealing structure of the hydraulic oil cylinder (hereinafter referred to as "this patent"), comprising a telescopic rod 1, a cylinder body 2, a sealing joint 3, a connecting section 3-1, a threaded ring 3-2, a handle 3-3, a connecting rod 3-4, an inner tube 3-5, a pull ring 3-6, a sealing pressure head 3-7, a pressure head inner convex 3-8, an anti-leakage corrugation 3-9, an inner tube cone head convex 3-10, a pressure head annular groove 3-11, a ball 3-12, and a pressure ring 3-13. The cylinder body 2 is sleeved with the telescopic rod 1, and the sealing joint 3 is welded and installed on the surface of the cylinder body 2. The sealing joint 3 also includes a connecting section 3-1, an inner tube 3-5 and a sealing pressure head 3-7. The center of the connecting section 3-1 is fixedly connected to the inner tube 3-5. The end of the inner tube 3-5 is conical, and three or four inner tube cone head convex 3-7 are arranged on the surface of the end of the conical inner tube 3-5 at equal intervals. -10, the surface of the inner tube 3-5 between the two inner tube cone head protrusions 3-10 near the conical end of the inner tube 3-5 is provided with anti-leakage corrugations 3-9; the threaded ring 3-2 is threadedly connected to the connecting section 3-1, the surface of the threaded ring 3-2 is fixedly connected to one end of the connecting rod 3-4, and the other end of the connecting rod 3-4 is fixedly connected to the pull ring 3-6, and the pull ring 3-6 is movably installed in the annular groove on the side of the sealing pressure head 3-7, and the sealing pressure head 3-7 is sleeved on the inner tube 3-5 through the through hole opened on the central axis, and the pressure head inner protrusion 3-8 on the inner side of the sealing pressure head 3-7 gradually enlarges toward one side of the inner tube 3-5, and a pressure head annular groove 3-11 corresponding to the inner tube cone head protrusion 3-10 is provided on the inner surface, and the pressure head annular groove 3-11 has a smaller slope toward the side of the connecting section 3-1; the outer side of the threaded ring 3-2 is threadedly connected to the handle 3-3. A ball 3-12 is provided between the pull ring 3-6 and the sealing pressure head 3-7.

[0020] The utility model number is CN217463636U, which is a leak-proof hydraulic cylinder joint (hereinafter referred to as "the patent"). The patent achieves sealing by clamping the wall of the hydraulic oil pipe through the interaction between the joint body and the sleeve. However, the joint body and the sleeve themselves are not movable, and it is difficult for the user to evenly feed the wall of the hydraulic pipe into the cavity between the joint body and the sleeve. The overall operation is cumbersome and not very convenient to use. At the same time, if disassembly is required, it is inevitable to cause damage when the hydraulic pipe is pulled out. If a small amount of hydraulic pipe remains in the cavity between the joint body and the sleeve , it will affect the secondary use, while this patent uses a movable sealing pressure head 3-7 to press the inner tube 3-5, and then uses the inner convexity 3-8 and the annular groove 3-11 of the sealing pressure head 3-7 to cooperate with the anti-leakage corrugation 3-9 on the surface of the inner tube 3-5 and the inner tube cone head convexity 3-10 to squeeze the hydraulic pipe from the inside and outside to achieve complete sealing. At the same time, because the sealing pressure head 3-7 itself can control the distance between the sealing pressure head 3-7 and the inner tube 3-5 under the action of the threaded ring 3-2, the connecting rod 3-4 and the pull ring 3-6, the hydraulic pipeline can be connected or removed more flexibly according to needs.

[0021] The structure of the second embodiment is basically the same as that of the first embodiment, except that Figure 5 As shown, the inner tube 3-5 is sleeved with a pressure ring 3-13 near the sealing pressure head 3-7. The pressure ring 3-13 can further improve the sealing performance after the sealing pressure head 3-7 is in place.

[0022] In order to further optimize the working efficiency of the present application and further improve the sealing performance, the surface of the pressure ring 3-13 is wrapped with rubber. In order to facilitate the insertion of the hydraulic pipeline, the diameter of the inner convex 3-8 of the sealing pressure head 3-7 is gradually enlarged toward the outside.

[0023] When in use, install the anti-leakage sealing structure suitable for the hydraulic cylinder and the equipment can be put into use.

[0024] When the utility model is in use, the specific operations are as follows:

[0025] When in use, the handle 3-3 is screwed to the threaded ring 3-2, and then the threaded ring 3-2 is rotated by the handle 3-3, and the threaded ring 3-2 slides and rises on the thread on the surface of the connecting section 3-1, driving the connecting rod 3-4, and the connecting rod 3-4 pushes the pull ring 3-6, and finally the pull ring 3-6 pushes the sealing pressure head 3-7 away from the inner tube 3-5, so that the gap between the sealing pressure head 3-7 and the inner tube 3-5 becomes larger, which is convenient for the insertion of the hydraulic pipe, and the pipe mouth of the hydraulic pipe is aligned with the inner tube 3-5 and pushed to the inner tube 3-5, so that the hydraulic pipe is sleeved on the inner tube 3-5 until it is against the pressure ring 3-13, and then the threaded ring 3-2 is rotated in the opposite direction, and the threaded ring 3-2 slides and descends on the thread on the surface of the connecting section 3-1 , driving the connecting rod 3-4, the connecting rod 3-4 applies tension to the pull ring 3-6, and finally the pull ring 3-6 pulls the sealing pressure head 3-7 toward the inner tube 3-5, so that the gap between the sealing pressure head 3-7 and the inner tube 3-5 becomes smaller, so that the sealing pressure head 3-7 and the inner tube 3-5 clamp the hydraulic pipe wall, at this time, the inner tube cone head convex 3-10 cooperates with the pressure head annular groove 3-11 to form a first sealing surface between the pipe wall and the surface of the inner tube 3-5, the anti-leakage corrugation 3-9 can further prevent the hydraulic oil from seeping out, and when the sealing pressure head 3-7 is compressed into place, it will support the pressure ring 3-13, and a second sealing surface can be formed between the sealing pressure head 3-7 and the pressure ring 3-13, thereby further improving the sealing performance.

[0026] In summary, the leakage-proof sealing structure suitable for the hydraulic cylinder of the utility model embodiment controls the distance between the sealing pressure head 3-7 and the inner tube 3-5 through the threaded ring 3-2, the connecting rod 3-4 and the pull ring 3-6, and cooperates with the conical structure inside the sealing pressure head 3-7 and the inner tube 3-5, so that the sealing pressure head 3-7 and the inner tube 3-5 can clamp the pipe wall of the hydraulic pipe to achieve sealing, which can effectively prevent the leakage of hydraulic oil and realize the rapid disassembly and assembly of the hydraulic pipeline.

[0027] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A liquid-leakage-proof sealing structure suitable for a hydraulic oil cylinder, comprising a telescopic rod (1), a cylinder body (2) and a sealing joint (3), wherein the cylinder body (2) is sleeved with the telescopic rod (1), and the sealing joint (3) is welded and installed on the surface of the cylinder body (2), characterized in that: The sealing joint (3) further comprises a connecting section (3-1), an inner tube (3-5) and a sealing pressure head (3-7); the connecting section (3-1) is fixedly connected to the inner tube (3-5) at the center; the end of the inner tube (3-5) is conical; three or four inner tube conical head protrusions (3-10) are arranged at equal intervals on the surface of the conical end of the inner tube (3-5); and an anti-leakage corrugation (3-9) is provided on the surface of the inner tube (3-5) between two inner tube conical head protrusions (3-10) close to the conical end of the inner tube (3-5); the threaded ring (3-2) is threadedly connected to the connecting section (3-1); the surface of the threaded ring (3-2) is fixedly connected to one end of the connecting rod (3-4); The other end of the connecting rod (3-4) is fixedly connected to the pull ring (3-6), and the pull ring (3-6) is movably installed in the annular groove on the side of the sealing pressure head (3-7). The sealing pressure head (3-7) is sleeved on the inner tube (3-5) through a through hole opened on the central axis. The pressure head inner convexity (3-8) on the inner side of the sealing pressure head (3-7) gradually enlarges toward one side of the inner tube (3-5), and is provided with a pressure head annular groove (3-11) corresponding to the inner tube cone head convexity (3-10) on the inner surface. The slope of the pressure head annular groove (3-11) toward the connecting section (3-1) is smaller; the outer side of the threaded ring (3-2) is threadedly connected to the handle (3-3).

2. The anti-liquid leakage sealing structure suitable for a hydraulic cylinder according to claim 1, characterized in that: A rolling ball (3-12) is provided between the pull ring (3-6) and the sealing pressure head (3-7).

3. The anti-liquid leakage sealing structure suitable for a hydraulic cylinder according to claim 1, characterized in that: The inner tube (3-5) is sleeved with a pressure ring (3-13) near the sealing pressure head (3-7).

4. The anti-liquid leakage sealing structure suitable for a hydraulic cylinder according to claim 3, characterized in that: The surface of the pressure ring (3-13) is wrapped with rubber.

5. The anti-liquid leakage sealing structure suitable for a hydraulic cylinder according to claim 1, characterized in that: The diameter of the inner convexity (3-8) of the sealing pressure head (3-7) gradually increases toward the outside.

Images