Sealed hydraulic oil cylinder for hydraulic machine

Abstract

The utility model relates to a sealed hydraulic oil cylinder for a hydraulic machine. The sealed hydraulic oil cylinder is provided with an oil cylinder body and a piston rod, a bearing block allowing a piston rod to pass through and capable of mutually sliding is arranged in the oil cylinder body close to one end communicated with the outside, the interior of the oil cylinder body is divided into a sealed space and a hydraulic space by the bearing block, the sealing piece is located in the sealed space, and an oil inlet pipe and an oil outlet pipe on the oil cylinder body are communicated with the hydraulic space. The sealing piece comprises an annular sealing ring and a sealing plate, the annular sealing ring comprises a pressing ring, a pressed ring and a sliding ring, and the inner wall of the sliding ring and the piston rod can slide. The sealing plate comprises an annular plate which is fixedly arranged on the oil cylinder body and is used for sealing the sealed space, and an extension plate of which one end is fixedly arranged on the annular plate and the other end extends into the sealed space; according to the sealing piece, the sealing effect is enhanced, and oil leakage is avoided.

Description

Technical Field

[0001] The utility model relates to a sealed hydraulic oil cylinder for a hydraulic machine. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are indispensable.

[0003] Existing sealing devices are usually made of polyurethane materials. Because the telescopic rod here performs piston motion for a long time, the wear on the sealing ring here is relatively large. After long-term use, the possibility of deformation and damage of the sealing ring increases, increasing the risk of falling and affecting the sealing effect. Utility Model Content

[0004] The utility model aims to provide a sealed hydraulic oil cylinder for a hydraulic machine, which can enhance the sealing effect and avoid oil leakage.

[0005] The technical solution for achieving the purpose of the utility model is as follows: the utility model comprises a cylinder body with one end connected to the outside and a piston rod slidably arranged in the cylinder body; a sealing member is also provided, and a bearing block through which the piston rod can pass and can slide with each other is provided inside the cylinder body near the end connected to the outside, and the inside of the cylinder body is divided into a sealed space and a hydraulic space by the bearing block, the sealing member is located in the sealed space, and the oil inlet pipe and the oil outlet pipe on the cylinder body are both connected to the hydraulic space;

[0006] The sealing member comprises an annular sealing ring and a sealing plate, wherein the annular sealing ring comprises a pressure ring, a pressure ring and a sliding ring whose inner wall can slide with the piston rod, the outer wall of the pressure ring is fixedly connected to the pressure ring, the inner wall of the pressure ring is fixedly connected to the sliding ring, both sides of the pressure ring are bent in the radial direction of the annular sealing ring, and a ring groove for the pressure ring to be embedded is provided on the side wall of the sealing space; the sealing plate comprises a ring plate fixedly arranged on the cylinder body and used for closing the sealing space, and an extension plate fixedly arranged on the ring plate at one end and extending to the inside of the sealing space at the other end, a through hole for the piston rod to pass through and form a sliding hole is provided in the middle of the ring plate, and the extension plate can squeeze the pressure ring as the ring plate is fixed.

[0007] Further, a plurality of coaxially arranged fin grooves are provided on both sides of the pressing ring. Both sides of the pressing ring are separated by the fin grooves into a plurality of coaxially arranged fin blocks for increasing the friction between the pressing ring and the ring groove. The fin blocks can abut against the side wall of the ring groove when the extension plate presses the pressure ring.

[0008] Further, a positioning groove communicating with the ring groove is provided on the cylinder body, and a positioning rod that can be inserted into the positioning groove to form a plug-in fit is fixedly provided on the ring plate; corresponding screw holes are provided on the ring plate and the cylinder body. After the positioning rod and the positioning groove form a plug-in fit, the screw holes on the ring plate correspond to the screws on the cylinder body, and the ring plate is fixedly arranged on the cylinder body through bolts.

[0009] Further, arc-shaped convex edges are provided on both sides of the pressure ring. The middle of the arc-shaped convex edge protrudes outward, and both sides of the arc-shaped convex edge are recessed inward.

[0010] Further, an arc-shaped pressing block for pressing the arc-shaped protrusion on the pressure ring is fixedly provided at one end of the extension plate extending into the sealing space.

[0011] Further, the cross-section of the pressing ring is fan-shaped. The height of the pressing ring is higher than that of the pressure ring, and the height of the pressure ring is higher than that of the sliding ring.

[0012] Further, a lubricating layer for increasing the sliding with the piston rod is fixedly provided on the inner wall of the sliding ring.

[0013] The utility model has positive effects: (1) The sealing member of the utility model includes an annular sealing ring and a sealing plate. The annular sealing ring includes a pressing ring, a pressure ring, and a sliding ring whose inner wall can slide with the piston rod; the sealing plate includes a ring plate fixedly arranged on the cylinder body for closing the sealing space and an extension plate with one end fixedly arranged on the ring plate and the other end extending into the sealing space; after the pressure ring is pressed by the extension plate, the pressing ring and the sliding ring expand outward under the deformation action of the pressure ring, so that the pressing ring can fill the space in the ring groove, and the sliding ring can fit against the side wall of the piston rod, which can prevent the hydraulic oil in the hydraulic space from leaking and enhance the sealing effect.

[0014] (2) A plurality of coaxially arranged fin grooves are provided on both sides of the pressing ring of the utility model. Both sides of the pressing ring are separated by the fin grooves into a plurality of coaxially arranged fin blocks for increasing the friction between the pressing ring and the ring groove. The fin blocks can abut against the side wall of the ring groove when the extension plate presses the pressure ring; the fin blocks can further increase the friction with the ring groove after the pressing ring is deformed by the pressure ring, preventing loosening.

[0015] (3) The oil cylinder body of the present utility model is provided with a positioning groove communicating with the annular groove, and a positioning rod that can be fixed on the annular plate and embedded in the positioning groove to form a plug-in fit; corresponding screw holes are provided on the annular plate and the oil cylinder body. After the positioning rod and the positioning groove form a plug-in fit, the screw holes on the annular plate correspond to the screws on the oil cylinder body; through the plug-in connection of the positioning rod and the positioning groove, the screw holes on the annular plate and the oil cylinder body can be automatically aligned, facilitating quick installation.

[0016] (4) Both sides of the pressure-bearing ring of the present utility model are provided with arc-shaped convex edges. The middle of the arc-shaped convex edges protrudes outwards, and both sides of the arc-shaped convex edges are recessed inwards. An arc-shaped pressing block for pressing the arc-shaped convexities on the pressure-bearing ring is fixedly provided at one end of the extension plate extending into the sealing space. Under the action of the arc-shaped pressing block, the pressure-bearing ring can be pressed to the greatest extent to ensure the sealing effect.

[0017] (5) A lubricating layer for increasing the sliding with the piston rod is fixedly provided on the inner wall of the sliding ring of the present utility model, reducing the friction between the sliding ring and the piston rod, and ensuring the sliding effect of the piston rod while ensuring the sealing effect. Description of the Drawings

[0018] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in conjunction with the drawings, where

[0019] Figure 1 is a sectional view of the present utility model;

[0020] Figure 2 is a sectional view of the annular sealing ring of the present utility model;

[0021] Figure 3 is Figure 1 a partial enlarged view of A in

[0022] Figure 4 is Figure 2 a partial enlarged view of B in

[0023] Figure 5 is a structural schematic diagram of the oil cylinder body of the present utility model. Detailed Description of the Embodiment

[0024] See Figures 1 to 5 , the present utility model has an oil cylinder body 1 with one end communicating with the outside and a piston rod 2 slidably arranged in the oil cylinder body 1; a sealing member is also provided. A bearing block 11 that can be passed through by the piston rod 2 and can form a sliding with each other is provided near one end of the interior of the oil cylinder body 1 that communicates with the outside. The interior of the oil cylinder body 1 is divided into a sealing space 12 and a hydraulic space 13 by the bearing block 11. The sealing member is located in the sealing space 12, and the oil inlet pipe 14 and the oil outlet pipe 15 on the oil cylinder body 1 are both communicated with the hydraulic space 13;

[0025] The seal includes an annular sealing ring 3 and a sealing plate 4. The annular sealing ring 3 includes a pressing ring 31, a pressed ring 32, and a sliding ring 33 whose inner wall can slide with the piston rod 2. The outer wall of the pressed ring 32 is fixedly connected to the pressing ring 31, and the inner wall of the pressed ring 32 is fixedly connected to the sliding ring 33. Both sides of the pressing ring 31 are bent towards the radial direction of the annular sealing ring 3, and a ring groove 121 for the pressing ring 31 to be embedded is provided on the side wall of the sealing space 12; The sealing plate 4 includes an annular plate 41 fixedly arranged on the oil cylinder body 1 and used to close the sealing space 12, and an extension plate 42 with one end fixedly arranged on the annular plate 41 and the other end extending into the sealing space 12. A through hole for the piston rod 2 to pass through and form a sliding connection is provided in the middle of the annular plate 41, and the extension plate 42 can squeeze the pressed ring 32 as the annular plate 41 is fixed.

[0026] A plurality of coaxially arranged fin grooves 311 are provided on both sides of the pressing ring 31. Both sides of the pressing ring 31 are separated by the fin grooves 311 into a plurality of coaxially arranged fin blocks 312 for increasing the friction between the pressing ring 31 and the ring groove 121. The fin blocks 312 can lean against the side wall of the groove of the pressing ring 31 when the extension plate 42 squeezes the pressed ring 32.

[0027] When the extension plate 42 squeezes the pressed ring 32, the pressing ring 31 located in the ring groove 121 will further fill the space in the ring groove 121 after the pressed ring 32 deforms. At this time, the fin blocks 312 will be squeezed and closely adhere to the groove wall of the ring groove 121, increasing the friction, so as to better fill the sliding groove space and enhance the sealing effect.

[0028] A positioning groove 16 communicating with the ring groove 121 is provided on the oil cylinder body 1, and a positioning rod that can be embedded in the positioning groove 16 to form a plug-in fit is also fixedly arranged on the annular plate 41; Corresponding screw holes are provided on the annular plate 41 and the oil cylinder body 1. After the positioning rod and the positioning groove 16 form a plug-in fit, the screw holes on the annular plate 41 correspond to the screws on the oil cylinder body 1, and the annular plate 41 is fixedly arranged on the oil cylinder body 1 through bolts.

[0029] Through the plug-in connection of the positioning rod and the positioning groove 16, the screw holes on the annular plate 41 and the oil cylinder body 1 can be automatically aligned, facilitating quick installation.

[0030] Arc-shaped convex edges 321 are provided on both sides of the pressed ring 32. The middle of the arc-shaped convex edges 321 bulges outwards, and both sides of the arc-shaped convex edges 321 are recessed inwards.

[0031] An arc-shaped pressing block 421 for pressing the arc-shaped protrusion on the pressed ring 32 is fixedly arranged at one end of the extension plate 42 extending into the sealing space 12; Under the action of the arc-shaped pressing block 421, the pressed ring 32 can be squeezed to the greatest extent to ensure the sealing effect.

[0032] When the middle of the arc-shaped convex edge 321 is squeezed by the arc-shaped pressing block, the two sides of the arc-shaped convex edge 321 change from the original indentation to protrusion, increasing the extrusion on the pressing ring 31 and making it fit more closely to the annular groove 121.

[0033] The cross-section of the pressing ring 31 is fan-shaped. The height of the pressing ring 31 is higher than that of the pressed ring 32, and the height of the pressed ring 32 is higher than that of the sliding ring 33.

[0034] A lubricating layer 331 for increasing the sliding with the piston rod 2 is fixedly provided on the inner wall of the sliding ring 33; the friction between the sliding ring 33 and the piston rod 2 is reduced, and while ensuring the sealing effect, the sliding effect of the piston rod 2 can also be ensured.

[0035] The working principle of the present utility model: Place the annular sealing ring 3 on the bearing block 11. At this time, the pressing block is embedded in the annular groove 121, and the sliding ring 33 is sleeved on the piston rod 2; through the plug-in fit of the positioning rod and the positioning groove 16, when the extension plate 42 extends into the sealing space 12 and squeezes the pressed ring 32, the screw holes on the ring plate 41 correspond to the screw holes on the oil cylinder body 1, and the ring plate 41 and the oil cylinder body 1 are fixed by the threaded fit of the bolts and the screw holes to complete the installation;

[0036] After the pressed ring 32 of the annular sealing ring 3 is deformed by extrusion, the pressing ring 31 can fill the space of the annular groove 121, increasing the sealing effect and ensuring the stability of the annular sealing ring 3 in the sealing space 12.

[0037] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealed hydraulic cylinder for a hydraulic press, comprising a cylinder body (1) with one end communicating with the outside and a piston rod (2) slidably disposed within the cylinder body (1); characterized in that: A seal is also provided. A bearing block (11) through which the piston rod (2) can pass and which can form a sliding fit with each other is provided at one end of the interior of the cylinder body (1) close to the outside communication. The interior of the cylinder body (1) is divided into a sealed space (12) and a hydraulic space (13) by the bearing block (11). The seal is located in the sealed space (12). The oil inlet pipe (14) and the oil outlet pipe (15) on the cylinder body (1) are both communicated with the hydraulic space (13). The seal includes an annular seal ring (3) and a sealing plate (4). The annular seal ring (3) includes a pressing ring (31), a pressed ring (32), and a sliding ring (33) whose inner wall can form a sliding fit with the piston rod (2). The outer wall of the pressed ring (32) is fixedly connected to the pressing ring (31), and the inner wall of the pressed ring (32) is fixedly connected to the sliding ring (33). The two sides of the pressing ring (31) are bent in the radial direction of the annular seal ring (3). A ring groove (121) for the pressing ring (31) to be embedded is provided on the side wall of the sealed space (12). The sealing plate (4) includes an annular plate (41) fixedly provided on the cylinder body (1) and used to close the sealed space (12), and an extension plate (42) with one end fixedly provided on the annular plate (41) and the other end extending into the interior of the sealed space (12). A through hole through which the piston rod (2) can pass and form a sliding fit is provided in the middle of the annular plate (41). The extension plate (42) can press the pressed ring (32) as the annular plate (41) is fixed.

2. A sealed hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: A plurality of coaxially arranged fin grooves (311) are provided on both sides of the pressing ring (31). Both sides of the pressing ring (31) are separated by the fin grooves (311) into a plurality of coaxially arranged fin blocks (312) for increasing the friction between the pressing ring (31) and the ring groove (121). The fin blocks (312) can lean against the side wall of the groove of the pressing ring (31) when the extension plate (42) presses the pressed ring (32).

3. A sealed hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: A positioning groove (16) communicated with the ring groove (121) is provided on the cylinder body (1). A positioning rod that can be embedded in the positioning groove (16) to form a plug-in fit is also fixedly provided on the annular plate (41). Corresponding screw holes are provided on the annular plate (41) and the cylinder body (1). After the positioning rod and the positioning groove (16) form a plug-in fit, the screw hole on the annular plate (41) corresponds to the screw on the cylinder body (1). The annular plate (41) is fixedly provided on the cylinder body (1) by bolts.

4. A sealed hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: Arc-shaped convex edges (321) are provided on both sides of the pressed ring (32). The middle of the arc-shaped convex edges (321) bulges outwards, and both sides of the arc-shaped convex edges (321) are recessed inwards.

5. The sealed hydraulic cylinder for a hydraulic press according to claim 4, characterized in that: An arc-shaped pressing block (421) for pressing the arc-shaped protrusion on the pressed ring (32) is fixedly provided at one end of the extension plate (42) extending into the sealed space (12).

6. A sealed hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: The cross-section of the pressing ring (31) is fan-shaped. The height of the pressing ring (31) is higher than the height of the pressed ring (32), and the height of the pressed ring (32) is higher than the height of the sliding ring (33).

7. A sealed hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: A lubricating layer (331) for increasing the sliding with the piston rod (2) is fixedly provided on the inner wall of the sliding ring (33).

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