Hydraulic Cylinder

Abstract

The utility model relates to a hydraulic cylinder, wherein a cylinder body is sleeved with a telescopic rod, a piston head is fixedly installed at one end of the telescopic rod in the cylinder body, and the piston head also comprises an annular sealing cover, a piston body, a sealing cover and a deformable sealing ring. The adjacent annular sealing covers, the piston body and the sealing covers are tightened by a spring, so that the outer L-shaped groove of the sealing cover of the sealing cover cooperates with the convex-shaped sealing ring installation position formed by the L-shaped groove of the piston body of the piston body to extrude the deformable sealing ring, so that when the friction layer of the deformable sealing ring is continuously worn, the friction layer can be tightly fitted to the inner side of the cylinder body by extruding the sealing ring body to ensure the sealing performance. Similarly, the outer L-shaped groove and the inner L-shaped groove of the annular sealing cover cooperate with the L-shaped groove of the piston body and the inner groove on the upper part of the piston body to extrude the deformable sealing ring and the inner ring deformable sealing ring to achieve sealing and an extremely long service life. The utility model can effectively improve the sealing performance and service life of the piston head.

Description

Technical Field

[0001] The utility model relates to an oil cylinder piston, in particular to a hydraulic oil cylinder. Background Art

[0002] Hydraulic cylinder is a common hydraulic transmission device, widely used in various mechanical equipment. The piston is one of the core components of the hydraulic cylinder. The piston uses the sealing ring to ensure that the hydraulic oil pushes the telescopic rod smoothly. However, the sealing ring of the existing hydraulic cylinder is constantly worn slowly in the cylinder during operation. After long-term use, the sealing performance will be reduced, which will affect the stability and performance of the hydraulic system.

[0003] At present, the utility model with patent number CN216278759U discloses a hydraulic oil cylinder piston rod structure, including a cylinder body and a rod body, a clearance fit is formed between the rod body and the cylinder body, an end pressure guide sleeve is arranged on the left end outer wall of the rod body, a bushing is arranged on the outer wall of the rod body, a mounting bolt is arranged on the outer edge of the end pressure guide sleeve, a dustproof oil seal is arranged on the inner ring edge of the end pressure guide sleeve, a sealing rubber ring is arranged on the right end of the end pressure guide sleeve, a buffer ring is arranged on the inner wall of the end pressure guide sleeve, a metal gasket is arranged on the right side of the buffer ring, a piston rod oil seal is arranged on the right side wall of the metal gasket, a piston head is arranged on the right end of the rod body, wear-resistant rings are arranged at both ends of the outer wall of the piston head, and a piston oil seal is arranged in the middle of the outer wall of the piston head. In the utility model, a hydraulic oil cylinder piston rod structure, the mounting bolt and the guide pin cooperate to improve the sealing performance of the end pressure guide sleeve, and the buffer ring and the wear-resistant ring can prevent the piston head from aging prematurely. This application proposal still relies on piston sealing mainly through wear-resistant rings and piston oil seals. In order to ensure that the wear-resistant rings and piston oil seals can be filled between the cylinder body and the piston, the volumes of the wear-resistant rings and piston oil seals are necessarily limited. When the wear-resistant rings and piston oil seals are directly facing the continuous friction with the inner wall of the cylinder body, they can only passively accept wear with limited thickness. The continuously worn wear-resistant rings and piston oil seals will still be damaged after long-term use, eventually leading to seal failure. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a hydraulic cylinder, which can effectively improve the sealing performance and service life of the piston head.

[0005] In order to achieve the above-mentioned purpose, the utility model comprises a hydraulic cylinder, including a telescopic rod, a cylinder body and a piston head. The cylinder body is sleeved with the telescopic rod, and the piston head is fixedly installed at one end of the telescopic rod in the cylinder body. The piston head also comprises an annular sealing cover, a piston body, a sealing cover and a deformable sealing ring. The upper surface of the piston body is connected to the annular sealing cover through a spring. The upper and lower edges of the outer side of the annular sealing cover body of the annular sealing cover are provided with outer L-shaped grooves, and the inner side of the annular sealing cover body is provided with inner L-shaped grooves at the upper and lower edges. The upper surface of the piston body is fixedly connected to one end of the telescopic rod, the annular sealing cover body is sleeved with the telescopic rod, and the upper surface of the piston body An L-shaped groove of the piston body corresponding to the outer L-shaped groove is formed on the surface, a groove corresponding to the inner L-shaped groove is formed on the upper surface of the piston body, the lower surface of the piston body is connected to the sealing cover through a spring, the outer side L-shaped grooves of the sealing cover are provided on the upper and lower sides of the outer side of the sealing cover body of the sealing cover, and an L-shaped groove of the piston body corresponding to the outer side L-shaped groove of the sealing cover is formed on the lower surface of the piston body; the L-shaped grooves of the serially connected annular sealing cover, piston body and sealing cover form a convex sealing ring installation position, and the deformable sealing ring is sleeved in the convex sealing ring installation position; the annular consumable material formed on the surface of the piston body cooperates with the inner L-shaped groove on the inner side of the annular sealing cover to install the inner ring deformable sealing ring.

[0006] In addition, the hydraulic cylinder according to the above embodiment of the utility model may also have the following additional technical features:

[0007] As a further improvement of the utility model, two or three annular sealing covers are connected in series on the upper surface of the piston body through a spring, and two or three sealing covers are connected in series on the lower surface of the piston body through a spring.

[0008] As a further improvement scheme of the utility model, the deformable sealing ring includes a sealing ring body, a fiber layer and a friction layer. The fiber layer is evenly distributed on the inner side of the sealing ring body, and a friction layer is provided on the side of the sealing ring body facing the inner wall of the cylinder body. The deformable sealing ring has the same structure as the inner ring deformable sealing ring, and the friction layer of the inner ring deformable sealing ring faces the telescopic rod.

[0009] As a further improvement of the utility model, three sealing ring installation grooves are provided on the side of the piston body.

[0010] As a further improvement of the present invention, the surfaces of the outer L-shaped groove and the inner L-shaped groove are both provided with corrugations.

[0011] Through the above scheme, the utility model has at least the following advantages: compared with the conventional oil cylinder piston head, the adjacent annular sealing cover, piston body and sealing cover are tightened by a spring, so that the outer L-shaped groove of the sealing cover of the sealing cover cooperates with the convex sealing ring installation position formed by the L-shaped groove of the piston body of the piston body to extrude the deformable sealing ring, so that when the friction layer of the deformable sealing ring is continuously worn, the friction layer can be tightly fitted to the inner side of the cylinder body by squeezing the sealing ring body to ensure the sealing performance. Similarly, the outer L-shaped groove and the inner L-shaped groove of the annular sealing cover cooperate with the L-shaped groove and the inner groove of the piston body on the upper part of the piston body to extrude the deformable sealing ring and the inner ring deformable sealing ring to achieve sealing and ultra-long service life, which can effectively improve the sealing performance and service life of the piston head. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of a hydraulic cylinder;

[0013] Figure 2 It is a three-dimensional diagram of the piston head of the hydraulic cylinder with the telescopic rod installed;

[0014] Figure 3 yes Figure 1 sectional view of

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

[0016] Figure 5 It is a three-dimensional diagram of the piston head of the hydraulic cylinder;

[0017] Figure 6 It is a side view of the piston head of the hydraulic cylinder;

[0018] Figure 7 It is a three-dimensional diagram of the annular sealing cover of the hydraulic cylinder;

[0019] Figure 8 It is a three-dimensional diagram of the sealing cover of the hydraulic cylinder;

[0020] Fig. 9 It is a cross-sectional view of a deformable sealing ring of a hydraulic cylinder;

[0021] In the figure: 1, telescopic rod, 2, cylinder body, 3, piston head, 3-1, annular sealing cover, 3-11, annular sealing cover body, 3-12, outer L-shaped groove, 3-13, inner L-shaped groove, 3-2, spring, 3-3, piston body, 3-31, sealing ring installation groove, 3-32, piston body L-shaped groove, 3-4, sealing cover, 3-41, sealing cover body, 3-42, outer L-shaped groove of sealing cover, 3-5, deformable sealing ring, 3-51, sealing ring body, 3-52, fiber layer, 3-53, friction layer, 3-6, convex sealing ring installation position. DETAILED DESCRIPTION

[0022] The hydraulic cylinder of the present utility model is described below in conjunction with the accompanying drawings.

[0023] In the first embodiment of the present application, Figures 1 to 8 As shown, the hydraulic cylinder (hereinafter referred to as "this patent") includes a telescopic rod 1, a cylinder body 2, a piston head 3, an annular sealing cover 3-1, an annular sealing cover body 3-11, an outer L-shaped groove 3-12, an inner L-shaped groove 3-13, a spring 3-2, a piston body 3-3, a sealing ring installation groove 3-31, a sealing cover 3-4, a sealing cover body 3-41, a sealing cover outer L-shaped groove 3-42, a deformable sealing ring 3-5, a sealing ring body 3-51, a fiber layer 3-52, and a friction layer 3-53 , a convex sealing ring installation position 3-6, the oil cylinder body 2 is sleeved with the telescopic rod 1, and the piston head 3 is fixedly installed at one end of the telescopic rod 1 in the oil cylinder body 2. The piston head 3 also includes an annular sealing cover 3-1, a piston body 3-3, a sealing cover 3-4 and a deformable sealing ring 3-5. The upper surface of the piston body 3-3 is connected to the annular sealing cover 3-1 through a spring 3-2. The outer upper and lower edges of the annular sealing cover body 3-11 of the annular sealing cover 3-1 are both provided with outer L-shaped grooves 3-12. The annular sealing cover body 3-11 The inner side is provided with inner L-shaped groove 3-13 on the upper and lower sides, the upper surface of the piston body 3-3 is fixedly connected to one end of the telescopic rod 1, the annular sealing cover body 3-11 is sleeved with the telescopic rod 1, the upper surface of the piston body 3-3 is provided with a piston body L-shaped groove 3-32 corresponding to the outer L-shaped groove 3-12, the upper surface of the piston body 3-3 is provided with a groove corresponding to the inner L-shaped groove 3-13, the lower surface of the piston body 3-3 is connected to the sealing cover 3-4 through the spring 3-2, and the outer side of the sealing cover body 3-41 of the sealing cover 3-4 is provided with a sealing The outer L-shaped groove 3-42 of the sealing cover, the lower surface of the piston body 3-3 is provided with a piston body L-shaped groove 3-32 corresponding to the outer L-shaped groove 3-42 of the sealing cover; the L-shaped grooves of the series-connected annular sealing cover 3-1, the piston body 3-3 and the sealing cover 3-4 form a convex sealing ring installation position 3-6, and the deformable sealing ring 3-5 is sleeved in the convex sealing ring installation position 3-6; the annular consumable material provided on the surface of the piston body 3-3 cooperates with the inner L-shaped groove 3-13 on the inner side of the annular sealing cover 3-1 to install the inner ring deformable sealing ring. The upper surface of the piston body 3-3 is connected in series with two or three annular sealing covers 3-1 through a spring 3-2, and the lower surface of the piston body 3-3 is connected in series with two or three sealing covers 3-4 through a spring 3-2. By arranging multiple annular sealing covers 3-1 and sealing covers 3-4 above and below the piston body 3-3, the number of sealing layers is increased to further ensure the sealing performance.

[0024] The utility model number is CN216278759U, a hydraulic cylinder piston rod structure (hereinafter referred to as "the patent"). The patent still realizes the piston seal mainly through the wear-resistant ring and the piston oil seal. In order to ensure that the wear-resistant ring and the piston oil seal can be filled between the cylinder body and the piston, the volume of the wear-resistant ring and the piston oil seal must be limited. When the wear-resistant ring and the piston oil seal are directly facing the continuous friction of the inner wall of the cylinder body, they can only passively accept wear with a limited thickness. The wear-resistant ring and the piston oil seal that are constantly worn will still be damaged after long-term use, eventually leading to sealing failure. The patent uses an annular sealing cover 3 -1's outer L-shaped groove 3-12 and inner L-shaped groove 3-13 cooperate with the piston body L-shaped groove 3-32 and the groove of the piston body 3-3 to squeeze the deformable sealing ring 3-5 and the inner ring deformable sealing ring therein by the contraction force of the spring 3-2, and form a seal through the deformation of the deformable sealing ring 3-5 and the inner ring deformable sealing ring, and ensure that the inner wall of the cylinder and the deformable sealing ring 3-5 can maintain a long-term seal through deformation. That is to say, if a part of the friction layer 3-53 is worn away, the friction layer 3-53 that is squeezed, deformed and overflowed will fill the gap due to the extrusion overflow to ensure air tightness. The piston body 3-3 and the sealing cover 3-4 also use the contraction force of the spring 3-2 to squeeze the deformable sealing ring 3-5 in the convex sealing ring installation position 3-6 formed by the L-shaped groove 3-32 of the piston body and the L-shaped groove 3-42 on the outer side of the sealing cover. The seal is formed by the deformation of the deformable sealing ring 3-5, and the deformation ensures that a long-term seal can be maintained between the inner wall of the cylinder and the deformable sealing ring 3-5, thereby ensuring that a long-term seal can be provided both above and below the piston body 3-3.

[0025] The structure of the second embodiment is basically the same as that of the first embodiment, except that Fig. 9 As shown, the deformable sealing ring 3-5 includes a sealing ring body 3-51, a fiber layer 3-52 and a friction layer 3-53. The fiber layer 3-52 is evenly distributed on the inner side of the sealing ring body 3-51. The friction layer 3-53 is provided on the side of the sealing ring body 3-51 facing the inner wall of the cylinder body 2. The deformable sealing ring 3-5 is consistent with the inner ring deformable sealing ring structure. The friction layer of the inner ring deformable sealing ring faces the telescopic rod 1.

[0026] In order to further optimize the working efficiency of the present application, further ensure the sealing effect of the piston body 3-3, and provide more redundancy to the entire piston mechanism, three sealing ring installation grooves 3-31 are provided on the side of the piston body 3-3. In order to ensure that the deformable sealing ring 3-5 can be stably clamped in the convex sealing ring installation position 3-6, the outer L-shaped groove 3-12 and the inner L-shaped groove 3-13 are both provided with corrugations.

[0027] When in use, install the hydraulic cylinder and connect the corresponding pipeline equipment and it can be put into use.

[0028] In summary, the hydraulic cylinder of the utility model embodiment tightens the adjacent annular sealing cover 3-1, piston body 3-3 and sealing cover 3-4 through the spring 3-2, so that the outer L-shaped groove 3-42 of the sealing cover of the sealing cover cooperates with the convex sealing ring installation position 3-6 formed by the piston body L-shaped groove 3-32 of the piston body 3-3 to extrude the deformable sealing ring 3-5, so that when the friction layer 3-53 of the deformable sealing ring 3-5 is continuously worn, the friction layer 3-53 can be tightly attached to the inner side of the cylinder body by extruding the sealing ring body 3-51 to ensure the sealing performance. Similarly, the outer L-shaped groove 3-12 and the inner L-shaped groove 3-13 of the annular sealing cover 3-1 cooperate with the piston body L-shaped groove 3-32 and the inner groove on the upper part of the piston body 3-3 to extrude the deformable sealing ring 3-5 and the inner ring deformable sealing ring to achieve sealing and ultra-long service life, which can effectively improve the sealing performance and service life of the piston head.

[0029] 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 hydraulic cylinder, comprising a telescopic rod (1), a cylinder body (2) and a piston head (3), wherein the cylinder body (2) is sleeved with the telescopic rod (1), and the piston head (3) is fixedly mounted at one end of the telescopic rod (1) in the cylinder body (2), characterized in that: The piston head (3) further comprises an annular sealing cover (3-1), a piston body (3-3), a sealing cover (3-4) and a deformable sealing ring (3-5); the upper surface of the piston body (3-3) is connected to the annular sealing cover (3-1) via a spring (3-2); the upper and lower edges of the outer sides of the annular sealing cover body (3-11) of the annular sealing cover (3-1) are both provided with outer L-shaped grooves (3-12); the upper and lower sides of the inner sides of the annular sealing cover body (3-11) are both provided with inner L-shaped grooves (3-13); the upper surface of the piston body (3-3) is fixedly connected to one end of the telescopic rod (1); the annular sealing cover body (3-11) is sleeved on the telescopic rod (1); the upper surface of the piston body (3-3) is provided with a piston body L-shaped groove (3-32) corresponding to the outer L-shaped groove (3-12); the upper surface of the piston body (3-3) is provided with a The piston body (3-3) is provided with a groove of an inner L-shaped groove (3-13); the lower surface of the piston body (3-3) is connected to the sealing cover (3-4) through a spring (3-2); the outer side of the sealing cover body (3-41) of the sealing cover (3-4) is provided with an outer L-shaped groove (3-42) of the sealing cover on the upper and lower sides; the lower surface of the piston body (3-3) is provided with an L-shaped groove (3-32) of the piston body corresponding to the outer L-shaped groove (3-42) of the sealing cover; the L-shaped grooves of the annular sealing cover (3-1), the piston body (3-3) and the sealing cover (3-4) connected in series form a convex sealing ring installation position (3-6); the deformable sealing ring (3-5) is sleeved in the convex sealing ring installation position (3-6); the annular consumable material provided on the surface of the piston body (3-3) cooperates with the inner L-shaped groove (3-13) on the inner side of the annular sealing cover (3-1) to install the inner ring deformable sealing ring.

2. The hydraulic cylinder according to claim 1, characterized in that: The upper surface of the piston body (3-3) is connected in series with two or three annular sealing covers (3-1) via a spring (3-2), and the lower surface of the piston body (3-3) is connected in series with two or three sealing covers (3-4) via a spring (3-2).

3. The hydraulic cylinder according to claim 2, characterized in that: The deformable sealing ring (3-5) comprises a sealing ring body (3-51), a fiber layer (3-52) and a friction layer (3-53); the fiber layer (3-52) is evenly distributed on the inner side of the sealing ring body (3-51); the friction layer (3-53) is provided on the side of the sealing ring body (3-51) facing the inner wall of the oil cylinder body (2); the deformable sealing ring (3-5) has the same structure as the inner ring deformable sealing ring; the friction layer of the inner ring deformable sealing ring faces the telescopic rod (1).

4. The hydraulic cylinder according to claim 1, characterized in that: Three sealing ring installation grooves (3-31) are provided on the side of the piston body (3-3).

5. The hydraulic cylinder according to claim 1 or 4, characterized in that: The surfaces of the outer L-shaped groove (3-12) and the inner L-shaped groove (3-13) are both provided with corrugations.

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