A high-load-bearing short-stroke hydraulic cylinder

Abstract

This utility model discloses a high-load-bearing short-stroke hydraulic cylinder, comprising an outer cylinder, a piston rod, a central tube, and an end cap. The outer cylinder is a cylindrical structure with openings at both ends. A guide sleeve is provided at the top of the outer cylinder, and an end cap is provided at the bottom. A piston rod is provided inside the outer cylinder, with its upper end protruding from the top opening of the outer cylinder and abutting against the inner diameter surface of the guide sleeve. The piston rod inside the outer cylinder has a hollow rod body. A piston body is fitted onto the outer wall of the hollow rod body, with the inner diameter surface of the piston body abutting against the outer wall of the central tube and the outer diameter surface of the piston body abutting against the inner wall of the outer cylinder. The central tube and the end cap are integrally connected. The end cap has a first oil inlet and a second oil inlet, with the first oil inlet communicating with the rodless chamber and the second oil inlet communicating with the central tube. This utility model achieves higher load-bearing capacity through two supporting oil circuits, greatly improving safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder manufacturing, and in particular to a high-load-bearing short-stroke hydraulic cylinder. Background Technology

[0002] In existing technologies, traditional short-stroke hydraulic cylinders generally rely on a single oil circuit for driving and support. On the one hand, the force-bearing area of ​​a single hydraulic oil circuit is limited, making it difficult to meet the requirements of high-load working conditions. On the other hand, a single oil circuit lacks redundancy protection. Once the oil circuit is blocked or the pressure is insufficient, it will directly lead to support failure, which can easily cause safety risks such as equipment tilting and collapse under heavy load conditions. Its reliability is difficult to adapt to high-load usage scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a high-load-bearing, short-stroke hydraulic cylinder with dual hydraulic support.

[0004] The purpose of this utility model is achieved as follows: A high-load-bearing short-stroke hydraulic cylinder includes an outer cylinder, a piston rod, a central tube, and an end cap. The outer cylinder is a cylindrical structure with openings at both ends. A guide sleeve is provided at the top of the outer cylinder, and an end cap is provided at the bottom. A piston rod is provided inside the outer cylinder, with the upper end of the piston rod protruding from the top opening of the outer cylinder and abutting against the inner diameter surface of the guide sleeve. The piston rod located inside the outer cylinder has a hollow rod body. A piston body is fitted on the outer wall of the hollow rod body, with the inner diameter surface of the piston body abutting against the outer wall of the central tube and the outer diameter surface of the piston body abutting against the inner wall of the outer cylinder. The central tube and the end cap are integrally connected. The end cap has a first oil inlet and a second oil inlet, with the first oil inlet communicating with the rodless cavity and the second oil inlet communicating with the central tube.

[0005] Preferably, a limiting groove is formed by an inward recess at one end face of the piston body, and the limiting groove is inserted into the outer wall of the hollow rod.

[0006] Preferably, a baffle is provided on the outer wall of the hollow rod, the baffle abuts against the upper plane of the piston body, the lower plane of the piston body is pressed by a pressure plate, and the pressure plate is connected to the end plane of the outer wall of the hollow rod by bolts.

[0007] Preferably, after the pressure plate abuts against the end cap, the top of the central tube does not abut against the top of the hollow rod, leaving a gap.

[0008] Preferably, the guide sleeve is provided with a third oil injection port that communicates with the rod cavity.

[0009] Compared with the prior art, the advantages of this utility model are:

[0010] 1. This utility model uses a dual oil circuit with a first oil inlet and a second oil inlet to simultaneously inject oil, which not only increases the force-bearing area of ​​the piston rod and significantly improves the high load-bearing performance to adapt to short-range heavy-load working conditions, but also forms a dual-circuit redundant support. Even if the hydraulic oil support of a single circuit is insufficient, the other circuit can still maintain the support, avoiding safety hazards caused by single circuit failure. The safety and reliability far exceed the existing single oil circuit technology.

[0011] 2. The piston body is optimized so that a single set of piston structures can realize a dual hydraulic oil supply circuit, resulting in lower costs and more convenient maintenance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] The components include: 1 outer cylinder, 2 piston rod, 201 hollow rod body, 2011 baffle, 3 center tube, 4 end cap, 401 first oil inlet, 402 second oil inlet, 5 guide sleeve, 501 third oil inlet, 6 piston body, 601 limiting groove, and 7 pressure plate. Detailed Implementation

[0014] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0015] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0016] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1 As shown, a high-load-bearing short-stroke hydraulic cylinder includes an outer cylinder 1, a piston rod 2, a central tube 3, and an end cap 4. The outer cylinder 1 is a cylindrical structure with openings at both ends. A guide sleeve 5 is provided at the top of the outer cylinder 1, and an end cap 4 is provided at the bottom. A piston rod 2 is provided inside the outer cylinder 1. The upper end of the piston rod 2 protrudes from the top opening of the outer cylinder 1 and abuts against the inner diameter surface of the guide sleeve 5. The piston rod 2 located inside the outer cylinder 1 has a hollow rod body 201. A piston body 6 is fitted on the outer wall of the hollow rod body 201. The inner diameter surface of the piston body 6 abuts against the outer wall of the central tube 3, and the outer diameter surface of the piston body 6 abuts against the inner wall of the outer cylinder 1. The central tube 3 and the end cap 4 are integrally connected. The end cap 4 has a first oil inlet 401 and a second oil inlet 402. The first oil inlet 401 is connected to the rodless cavity, and the second oil inlet 402 is connected to the central tube 3.

[0018] like Figure 1 As shown, a limiting groove 601 is formed by an inward recess at one end face of the piston body 6. The limiting groove 601 is inserted into the outer wall of the hollow rod 201. After being embedded, the piston body can reduce the radial sway of the piston body during operation and further improve the stability of the connection between the piston body and the hollow rod.

[0019] like Figure 1 As shown, a baffle 2011 is provided on the outer wall of the hollow rod 201. The baffle 2011 abuts against the upper plane of the piston body 6. The lower plane of the piston body 6 is pressed by a pressure plate 7. The pressure plate 7 is connected to the end plane of the outer wall of the hollow rod 201 by bolts. The upper and lower end faces of the piston body are pressed together by the pressure plate and the baffle to fix the piston body and improve its resistance to deformation.

[0020] like Figure 1 As shown, after the pressure plate 7 abuts against the end cap 4, the top of the central tube 3 does not abut against the top of the hollow rod 201, leaving a gap to ensure that the internal piston rod will not abut against the central tube when the piston rod is displaced, thus avoiding hard contact between the two.

[0021] like Figure 1 As shown, the guide sleeve 5 is provided with a third oil inlet 501 that is connected to the rod chamber. The piston rod can be retracted by the gravity of an external load or by oil injection through the third oil inlet.

[0022] The working principle of this utility model is explained as follows: During use, the exposed end of the piston rod is the load-bearing end. When lifting, oil can be injected simultaneously into the first and second oil injection ports to push the piston rod out. When the piston rod is under load, it is supported by hydraulic oil through two different pipelines inside the piston rod. The dual oil circuit cooperative support design significantly improves the load-bearing capacity of the hydraulic cylinder by increasing the force-bearing area, meeting high load-bearing requirements. On the other hand, the dual-circuit redundancy can reduce the risk of support failure caused by single-circuit failure, improve the safety and reliability of equipment operation, and is especially suitable for short-range, high-load working conditions.

[0023] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A high-load-bearing, short-stroke hydraulic cylinder, characterized in that, The device includes an outer cylinder, a piston rod, a central tube, and an end cap. The outer cylinder is a cylindrical structure with openings at both ends. A guide sleeve is provided at the top of the outer cylinder, and an end cap is provided at the bottom. A piston rod is provided inside the outer cylinder, with the upper end of the piston rod protruding from the top opening of the outer cylinder and abutting against the inner diameter surface of the guide sleeve. The piston rod located inside the outer cylinder has a hollow rod body. A piston body is fitted on the outer wall of the hollow rod body, with the inner diameter surface of the piston body abutting against the outer wall of the central tube and the outer diameter surface of the piston body abutting against the inner wall of the outer cylinder. The central tube and the end cap are integrally connected. The end cap has a first oil inlet and a second oil inlet, with the first oil inlet communicating with the rodless chamber and the second oil inlet communicating with the central tube.

2. The high-load-bearing short-stroke hydraulic cylinder according to claim 1, characterized in that, A limiting groove is formed by an inward recess at one end face of the piston body, and the limiting groove is inserted into the outer wall of the hollow rod.

3. A high-load-bearing, short-stroke hydraulic cylinder according to claim 1, characterized in that, A baffle is provided on the outer wall of the hollow rod body. The baffle abuts against the upper plane of the piston body. The lower plane of the piston body is pressed by a pressure plate. The pressure plate is connected to the end plane of the outer wall of the hollow rod body by bolts.

4. A high-load-bearing short-stroke hydraulic cylinder according to claim 3, characterized in that, After the pressure plate comes into contact with the end cap, the top of the central tube does not come into contact with the top of the hollow rod, leaving a gap.

5. A high-load-bearing, short-stroke hydraulic cylinder according to claim 1, characterized in that, The guide sleeve is provided with a third oil injection port that is connected to the rod cavity.

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