A sealed hydraulic cylinder

Abstract

The utility model discloses a kind of sealing hydraulic cylinders in the technical field of hydraulic cylinder, including hydraulic cylinder body and piston rod, one end of the hydraulic cylinder body is sealing structure, the open structure of other end, one end of open structure is provided with connecting flange, the outside of connecting flange is provided with hydraulic cooperation cover, the cooperation end face of the hydraulic cylinder body, the hydraulic cooperation cover is all correspondingly provided with mounting groove, sealing ring is provided at the mounting groove, the two sides of the sealing ring are correspondingly provided with end face sealing groove, end face sealing ring is provided in the end face sealing groove. The utility model one end of hydraulic cylinder body is provided with hydraulic cooperation cover, and sealing ring, connecting sealing ring, end face sealing ring, sliding fit sealing ring are set between hydraulic cooperation cover and hydraulic cylinder body, multiple sealing structure is set, can effectively improve the sealing property of the whole hydraulic cylinder, to meet the use demand under vibration environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic cylinders, specifically, it relates to a sealed hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. Existing hydraulic cylinders can meet the requirements of normal environments, but in vibration environments, higher requirements are placed on the sealing performance of the hydraulic cylinders. During the extension and retraction of existing hydraulic cylinders, relative rotation occurs between the piston rod and the cylinder body, affecting the performance.

[0003] In view of this, this utility model is hereby proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a sealed hydraulic cylinder. The basic concept of the technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: A sealed hydraulic cylinder includes a cylinder body and a piston rod. One end of the cylinder body is a sealed structure, and the other end is an open structure. A connecting flange is provided at the open structure end. A hydraulic mating cover is provided on the outer side of the connecting flange. Mounting grooves are correspondingly provided on the mating end faces of the hydraulic mating cover and the cylinder body. A sealing ring is provided at the mounting groove. End face sealing grooves are correspondingly provided on both sides of the sealing ring. End face sealing rings are provided in the end face sealing grooves. Sliding sealing grooves are correspondingly provided on the inner walls of the cylinder body and the hydraulic mating cover on both sides of the sealing ring. Sliding mating sealing rings are installed in the sliding sealing grooves. A stroke guide groove is provided on the outer wall of the extension end of the piston rod. A stroke guide round head screw is installed on the outer side of the hydraulic mating cover. The position and specifications of the stroke guide round head screw are adapted to the stroke guide groove to axially limit the extension and retraction of the piston rod.

[0005] As a further embodiment of this utility model: the hydraulic mating cover and the hydraulic cylinder body are respectively provided with the connecting flange, the diameter of the connecting flange of the hydraulic cylinder body is larger than the diameter of the connecting flange of the hydraulic mating cover, and the hydraulic cylinder body and the connecting flange of the hydraulic mating cover are respectively provided with connecting mating holes, and connecting screws are provided in the connecting mating holes. The connecting screws are selected as internal hexagon socket head cap screws.

[0006] As a further improvement of this utility model: a connecting sealing groove is correspondingly provided on the mating surface of the hydraulic cylinder body and the hydraulic mating cover, and a connecting sealing ring is installed in the connecting sealing groove to improve the mating sealing performance between the hydraulic cylinder body and the hydraulic mating cover.

[0007] As a further improvement of this utility model: the sealing ring is made of copper, and a piston plate is provided at one end of the piston rod that mates with the inner wall of the hydraulic cylinder. A sealing groove is correspondingly provided on the outer diameter of the piston plate that mates with the inner wall of the hydraulic cylinder, and a sealing ring is correspondingly provided in the sealing groove to improve the sealing performance of the piston plate and the hydraulic cylinder.

[0008] As a further improvement of this utility model: the sealing groove is provided in two sets, and an oil inlet is provided on the outer wall of the hydraulic cylinder body at the end away from the connecting flange, and an oil outlet is provided on the outer wall of the hydraulic cylinder body at the end near the connecting flange, for the supply and discharge of hydraulic fluid.

[0009] As a further improvement of this utility model: a lubrication groove is provided on the inner wall of the hydraulic mating cover, and a straight-through pressure injection cup is installed on the outer wall of the hydraulic mating cover corresponding to the lubrication groove by means of a threaded connection, for effective lubrication of the mating position.

[0010] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0011] The present invention provides a hydraulic mating cover at one end of the hydraulic cylinder body. A sealing ring, a connecting sealing ring, an end face sealing ring, and a sliding mating sealing ring are provided between the hydraulic mating cover and the hydraulic cylinder body. The multiple sealing structure can effectively improve the overall sealing performance of the hydraulic cylinder to meet the requirements of use in vibration environments.

[0012] This invention features a stroke guide groove on the outer diameter of the piston rod extension end, and a stroke guide round head screw that matches the stroke guide groove is installed on the hydraulic mating cover. The relative rotation of the piston rod is effectively limited by the cooperation between the stroke guide groove and the stroke guide round head screw, thereby improving the stability of the piston rod during use.

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a partial enlarged view of point A of this utility model.

[0015] In the diagram: 1. Hydraulic cylinder body; 2. Piston rod; 3. Hydraulic mating cover; 4. Stroke guide groove; 5. Connecting screw; 6. Straight-through pressure injection cup; 7. Stroke guide round head screw; 8. Lubrication groove; 9. Piston plate; 10. Sealing mating groove; 11. Sealing mating ring; 12. Oil inlet; 13. Oil outlet; 14. Connecting flange; 15. Connecting sealing groove; 16. Connecting sealing ring; 17. Mounting groove; 18. Sealing ring; 19. End face sealing groove; 20. End face sealing ring; 21. Connecting mating hole; 22. Sliding sealing groove; 23. Sliding mating sealing ring.

[0016] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0018] like Figures 1 to 3As shown, a sealed hydraulic cylinder includes a cylinder body 1 and a piston rod 2. One end of the cylinder body is a sealed structure, while the other end is an open structure. A connecting flange 14 is provided at the open end, and a hydraulic mating cover 3 is provided on the outside of the connecting flange 14. Mounting grooves 17 are provided on the mating end faces of the hydraulic mating cover 3 and the cylinder body 1, respectively. A sealing ring 18 is provided at the mounting groove 17, and end face sealing grooves 19 are provided on both sides of the sealing ring 18. An end face sealing ring 20 is provided in the end face sealing groove 19. Sliding sealing grooves 22 are provided on the inner walls of the cylinder body 1 and the hydraulic mating cover 3 on both sides of the sealing ring 18, respectively. Sliding mating sealing rings 23 are installed in the sliding sealing grooves 22. A stroke guide groove 4 is provided on the outer wall of the extension end of the piston rod 2, and a stroke guide round head screw 7 is installed on the outside of the hydraulic mating cover 3. The position and specifications of the stroke guide round head screw 7 are adapted to the stroke guide groove 4 to axially limit the extension and retraction of the piston rod 2.

[0019] The hydraulic mating cover 3 and the hydraulic cylinder body 1 are respectively provided with connecting flanges 14. The diameter of the connecting flange 14 of the hydraulic cylinder body 1 is larger than the diameter of the connecting flange 14 of the hydraulic mating cover 3. The connecting flanges 14 of the hydraulic cylinder body 1 and the hydraulic mating cover 3 are respectively provided with connecting mating holes 21. Connecting screws 5 are provided in the connecting mating holes 21. The connecting screws 5 are selected as internal hexagonal head screws.

[0020] A connecting sealing groove 15 is provided on the mating surface of the hydraulic cylinder body 1 and the hydraulic mating cover 3. A connecting sealing ring 16 is installed in the connecting sealing groove 15 to improve the mating sealing between the hydraulic cylinder body 1 and the hydraulic mating cover 3.

[0021] The sealing ring 18 is made of copper. A piston plate 9 is provided on one end of the piston rod 2 that mates with the inner wall of the hydraulic cylinder body 1. A sealing groove 10 is correspondingly provided on the outer diameter of the piston plate 9 that mates with the inner wall of the hydraulic cylinder body 1. A sealing ring 11 is correspondingly provided in the sealing groove 10 to improve the sealing performance of the piston plate 9 and the hydraulic cylinder body 1.

[0022] The sealing groove 10 is provided in two sets. An oil inlet 12 is provided on the outer wall of the hydraulic cylinder body 1 at the end away from the connecting flange 14, and an oil outlet 13 is provided on the outer wall of the hydraulic cylinder body 1 at the end near the connecting flange 14 for the supply and discharge of hydraulic fluid.

[0023] The inner wall of the hydraulic mating cover 3 is provided with a lubrication groove 8, and a straight-through pressure injection cup 6 is installed on the outer wall of the hydraulic mating cover 3 corresponding to the lubrication groove 8 through a threaded connection for effective lubrication of the mating position.

[0024] The working principle of this utility model is as follows: Two sets of sealing grooves 10 are correspondingly opened on the outer wall of the piston plate 9 of the piston rod 2. A sealing ring 11 is installed in each sealing groove 10, ensuring good sealing between the piston plate 9 and the hydraulic cylinder body 1. A connecting sealing groove 15 and a connecting sealing ring 16 are provided between the hydraulic cylinder body 1 and the hydraulic cover 3, ensuring good sealing between the hydraulic cover 3 and the hydraulic cylinder body 1. Simultaneously, a copper sealing ring 18 is provided at the mating position between the hydraulic cylinder body 1 and the hydraulic cover 3. Copper has a low elastic modulus, making it easier to deform effectively under hydraulic pressure. This makes it easier for the sealing ring 18 to deform under hydraulic pressure. The sealing ring 18 has end face sealing grooves 19 and end face sealing rings 20 correspondingly provided between its two end faces and the hydraulic cylinder body 1 and the hydraulic mating cover 3, further improving the sealing effect. The hydraulic cylinder body 1, the hydraulic mating cover 3 and the piston rod 2 are all provided with sliding sealing grooves 22 and sliding mating sealing rings 23 correspondingly at their mating positions, so that the piston rod 2 has good mating sealing performance and meets the usage requirements of different usage environments. A lubrication groove 8 is provided on the inner side of the hydraulic mating cover 3. The lubrication groove 8 is an annular groove structure. A straight-through pressure injection cup 6 is provided in the lubrication groove 8 to effectively lubricate the extension and retraction process of the piston rod 2 and improve the working stability of the hydraulic cylinder. A stroke guide groove 4 is provided on the piston rod 2, which can accurately set the stroke of the hydraulic cylinder and, through the cooperation of the stroke guide round head screw 7 and the stroke guide groove 4, axially limit the piston rod 2 to prevent the piston rod 2 from rotating relative to the hydraulic cylinder body 1. The hydraulic cylinder body 1 of this utility model is provided with a hydraulic mating cover 3 at one end. A sealing ring 18, a connecting sealing ring 16, an end face sealing ring 20, and a sliding mating sealing ring 23 are provided between the hydraulic mating cover 3 and the hydraulic cylinder body 1. The multiple sealing structure can effectively improve the overall sealing performance of the hydraulic cylinder to meet the requirements of use in vibration environment. A stroke guide groove 4 is opened on the outer diameter of the extended end of the piston rod 2. A stroke guide round head screw 7 that is adapted to the stroke guide groove 4 is installed on the hydraulic mating cover 3. The relative rotation of the piston rod 2 is effectively limited by the cooperation of the stroke guide groove 4 and the stroke guide round head screw 7, thereby improving the stability of the piston rod 2 during use.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A sealed hydraulic cylinder, comprising a cylinder body (1) and a piston rod (2), characterized in that, One end of the hydraulic cylinder body (1) is a sealed structure, and the other end is an open structure. A connecting flange (14) is provided at one end of the open structure. A hydraulic mating cover (3) is provided on the outside of the connecting flange (14). Mounting grooves (17) are provided on the mating end faces of the hydraulic mating cover (3) and the hydraulic cylinder body (1). A sealing ring (18) is provided at the mounting groove (17). End face sealing grooves (19) are provided on both sides of the sealing ring (18). An end face sealing groove (19) is provided in the end face sealing groove (19). The end face sealing ring (20), the inner walls of the hydraulic cylinder body (1) and the hydraulic mating cover (3) on both sides of the sealing ring (18) are respectively provided with sliding sealing grooves (22), the sliding sealing grooves (22) are installed with sliding mating sealing rings (23), the outer wall of the extension end of the piston rod (2) is provided with stroke guide grooves (4), the outer side of the hydraulic mating cover (3) is provided with stroke guide round head screws (7), and the position and specifications of the stroke guide round head screws (7) are adapted to the stroke guide grooves (4).

2. A sealed hydraulic cylinder according to claim 1, characterized in that, The hydraulic mating cover (3) and the hydraulic cylinder body (1) are respectively provided with the connecting flange (14). The diameter of the connecting flange (14) of the hydraulic cylinder body (1) is larger than the diameter of the connecting flange (14) of the hydraulic mating cover (3). The hydraulic cylinder body (1) and the connecting flange (14) of the hydraulic mating cover (3) are respectively provided with connecting mating holes (21). Connecting screws (5) are provided in the connecting mating holes (21).

3. A sealed hydraulic cylinder according to claim 2, characterized in that, The hydraulic cylinder body (1) and the hydraulic mating cover (3) are respectively provided with connecting sealing grooves (15), and connecting sealing rings (16) are installed in the connecting sealing grooves (15).

4. A sealed hydraulic cylinder according to claim 3, characterized in that, The sealing ring (18) is made of copper. A piston plate (9) is provided on one end of the piston rod (2) that cooperates with the inner wall of the hydraulic cylinder body (1). A sealing groove (10) is correspondingly opened on the outer diameter of the piston plate (9) that cooperates with the inner wall of the hydraulic cylinder body (1). A sealing ring (11) is correspondingly provided in the sealing groove (10).

5. A sealed hydraulic cylinder according to claim 4, characterized in that, The sealing groove (10) is provided in two sets. An oil inlet (12) is provided on the outer wall of the hydraulic cylinder body (1) away from the connecting flange (14), and an oil outlet (13) is provided on the outer wall of the hydraulic cylinder body (1) near the connecting flange (14).

6. A sealed hydraulic cylinder according to claim 5, characterized in that, The inner wall of the hydraulic mating cover (3) is provided with a lubrication groove (8), and a straight-through pressure injection cup (6) is installed on the outer wall of the hydraulic mating cover (3) corresponding to the lubrication groove (8) by a threaded connection.

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