Piston-free oil cylinder

Abstract

The utility model discloses a piston-free type oil cylinder which comprises a cylinder body and a piston rod assembly arranged in the cylinder body. The cylinder body is of a barrel structure with two open ends, a front end cover and a rear end cover are arranged at the two ends of the cylinder body respectively, and an annular protruding wall is arranged on the rear end cover. After the annular protruding wall is inserted into the cylinder body, the rear end cover is connected with the cylinder body through bolts. The center of the rear end cover is provided with a first oil port; the right part of the cylinder body is provided with a second oil port communicated with the rod cavity; the piston rod assembly is composed of a cylinder with one open end and a piston rod. The open end of the barrel is inserted between the annular protruding wall and the cylinder body, and the other end of the piston rod penetrates through the guide sleeve and the front end cover to be exposed outside the cylinder body. The hydraulic cylinder is novel in structure, no piston is arranged in the cylinder body, the situation that the piston is damaged is avoided, meanwhile, the oil leakage observation hole is designed, the overall sealing performance of the piston can be accurately judged, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to a piston-free oil cylinder. Background Art

[0002] Traditional oil cylinders are mainly composed of cylinder barrels and cylinder heads, pistons and piston rods, sealing devices, buffer devices and exhaust devices. The pressure difference on both sides of the piston is used to achieve linear motion, so there must be a sealed piston in the middle. There must be an oil supply system on both sides of the piston, with oil entering one side and oil exiting the other side, and this repeated cycle achieves reciprocating motion. Since the middle piston is sealed with the cylinder body and rubs back and forth during movement, the precision requirements for the inner cavity of the cylinder body are very high, and it needs to be heat-resistant and friction-resistant.

[0003] In view of the above shortcomings of traditional hydraulic cylinders, the design of piston-free cylinders was proposed. This new type of cylinder eliminates the friction between the sealing piston and the cylinder body by eliminating the piston design, reducing the precision requirements for the inner cavity of the cylinder body, and also reducing energy consumption and manufacturing costs. Utility Model Content

[0004] The utility model aims to provide a piston-free oil cylinder with a novel structure.

[0005] The purpose of the utility model is achieved as follows: a piston-free oil cylinder comprises a cylinder body and a piston rod assembly arranged in the cylinder body;

[0006] The cylinder body is a cylindrical structure with openings at both ends, and a front cover and a rear cover are respectively provided at both ends of the cylinder body, and an annular convex wall is provided on the rear cover; after the annular convex wall is inserted into the cylinder body, the rear cover is connected to the cylinder body by bolts; a first oil port is provided in the center of the rear cover, and a second oil port is provided on the right part of the cylinder body to communicate with the rod chamber;

[0007] The piston rod assembly is composed of a cylinder with an opening at one end and a piston rod; the open end of the cylinder is inserted between the annular raised wall and the cylinder body, and the other end of the piston rod passes through the guide sleeve and the front end cover to expose the outside of the cylinder body.

[0008] Preferably, a plurality of sets of fixing grooves are provided on the inner wall and outer wall of the cylinder opening and on the outer wall of the cylinder bottom, and the fixing grooves are provided with O-rings, step seals, support rings and O-rings in sequence from left to right.

[0009] Preferably, a plurality of groups of raised wall grooves are provided on the outer side of the opening of the annular raised wall, and the raised wall grooves are provided with an O-ring, a step seal, a support ring, and an O-ring in sequence from left to right.

[0010] Preferably, a rubber layer is arranged around the bottom of the cylinder.

[0011] Preferably, when the rubber layer at the bottom of the cylinder body contacts the guide sleeve, the O-ring at the rightmost side of the inner wall at the opening of the cylinder body does not contact the O-ring at the leftmost side of the groove of the raised wall.

[0012] Preferably, when the bottom of the inner cavity of the cylinder body contacts the annular raised wall, the opening of the cylinder body does not contact the rear end cover and a gap is left, and an oil leakage observation hole is opened on the cylinder body located at the gap.

[0013] Compared with the prior art, the utility model is beneficial in that:

[0014] 1. The bottom of the piston rod is set as a cylinder with one end open to replace the piston, which avoids the wear of the piston. That is, the piston will not fail due to damage during use, which greatly improves the stability of operation;

[0015] 2. Multiple sets of sealing rings and supporting rings are arranged on the annular raised wall and the cylinder body, which can effectively ensure the sealing between the cylinder body and the cylinder body and the annular raised wall. At the same time, the supporting ring can provide support to ensure the stability of the piston assembly during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Among them, 1 cylinder body, 2 piston rod assembly, 201 barrel, 2011 fixed groove, 202 piston rod, 3 front end cover, 4 rear end cover, 5 annular raised wall, 501 raised wall groove, 6 first oil port, 7 second oil port, 8 O-ring, 9 step seal, 10 support ring, 11 rubber layer, 12 raised wall groove. DETAILED DESCRIPTION

[0018] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0019] It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only 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.

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figure 1 As shown, a pistonless oil cylinder comprises a cylinder body 1 and a piston rod assembly 2 arranged in the cylinder body 1;

[0022] The cylinder body 1 is a cylindrical structure with openings at both ends. A front cover 3 and a rear cover 4 are respectively provided at both ends of the cylinder body 1. An annular raised wall 5 is provided on the rear cover 4. After the annular raised wall 5 is inserted into the cylinder body 1, the rear cover 4 is connected to the cylinder body 1 by bolts. A first oil port 6 is provided in the center of the rear cover 4 to communicate with the inner cavity, and a second oil port 7 is provided on the right part of the cylinder body 1 to communicate with the rod cavity.

[0023] The piston rod assembly 2 is composed of a cylinder 201 with an opening at one end and a piston rod 202; the open end of the cylinder 201 is inserted between the annular raised wall 5 and the cylinder body 1, and the other end of the piston rod 202 passes through the guide sleeve and the front end cover 3 to expose the outside of the cylinder body 1, and the guide sleeve is connected to the cylinder body and the front end cover.

[0024] like Figure 1 As shown, multiple groups of fixing grooves 2011 are provided on the inner wall and outer wall of the opening of the cylinder 201 and the outer wall of the bottom of the cylinder. The fixing grooves 2011 are provided with O-rings 8, step seals 9, support rings 10, and O-rings 8 from left to right.

[0025] like Figure 1 As shown, a plurality of groups of raised wall grooves 501 are provided on the outer side of the opening of the annular raised wall 5, and the raised wall grooves 501 are provided with O-rings 8, step seals 9, support rings 10, and O-rings 8 in sequence from left to right. The plurality of sealing components are provided to improve the sealing between the annular raised wall and the cylinder body, and the support ring is used to support the cylinder body and ensure that it does not deviate or swing.

[0026] like Figure 1 As shown, a rubber layer 11 is disposed around the bottom of the cylinder 201, and the rubber layer is used to offset the hard contact between the cylinder and the guide sleeve, thereby avoiding damage to the cylinder and the guide sleeve and extending the service life.

[0027] like Figure 1 As shown, when the rubber layer at the bottom of the cylinder 201 conflicts with the guide sleeve, the O-ring 8 on the rightmost side of the inner wall at the opening of the cylinder 201 does not conflict with the O-ring 8 on the leftmost side of the groove of the raised wall, ensuring that the sealing structure between the cylinder and the annular raised wall does not conflict when the piston rod assembly is extended or retracted, thereby protecting the sealing structure and extending the service life of the sealing structure.

[0028] like Figure 1 As shown, when the bottom of the inner cavity of the cylinder 201 conflicts with the annular raised wall 5, the opening of the cylinder does not conflict with the rear end cover and a gap is left. An oil leakage observation hole 12 is opened on the cylinder body at the gap. After the front end cover and the rear end cover are connected, the entire cylinder body is in a sealed state. When oil leakage occurs in the oil leakage observation hole, it can be known that there is a problem with the sealing between the cylinder and the annular raised wall, which is convenient for operators to identify abnormal conditions of the equipment.

[0029] The working principle of the utility model is explained as follows: when in use, oil enters the first oil port and the piston rod extends; oil enters the second oil port and the piston rod retracts; the cylinder body is used as the piston, and there is no piston in the entire oil cylinder, thus avoiding the need for maintenance of the piston, which is convenient and practical; at the same time, an oil leakage observation hole is provided, and by observing this area, the overall sealing of the oil cylinder can be judged, which is very practical.

[0030] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A pistonless oil cylinder, characterized in that: It includes a cylinder body and a piston rod assembly arranged in the cylinder body; The cylinder body is a cylindrical structure with openings at both ends, and a front cover and a rear cover are respectively provided at both ends of the cylinder body, and an annular convex wall is provided on the rear cover; after the annular convex wall is inserted into the cylinder body, the rear cover is connected to the cylinder body by bolts; a first oil port is provided in the center of the rear cover, and a second oil port is provided on the right part of the cylinder body to communicate with the rod chamber; The piston rod assembly is composed of a cylinder with an opening at one end and a piston rod; the open end of the cylinder is inserted between the annular raised wall and the cylinder body, and the other end of the piston rod passes through the guide sleeve and the front end cover to expose the outside of the cylinder body.

2. The pistonless oil cylinder according to claim 1, characterized in that: A plurality of sets of fixing grooves are arranged on the inner wall and the outer wall of the cylinder opening and the outer wall of the cylinder bottom. The fixing grooves are arranged with O-rings, step seals, support rings and O-rings in sequence from left to right.

3. The pistonless oil cylinder according to claim 1, characterized in that: A plurality of groups of raised wall grooves are arranged outside the opening of the annular raised wall, and the raised wall grooves are provided with an O-ring, a step seal, a support ring and an O-ring in sequence from left to right.

4. The pistonless oil cylinder according to claim 1, characterized in that: A rubber layer is arranged around the bottom of the cylinder.

5. The pistonless oil cylinder according to claim 1, characterized in that: When the rubber layer at the bottom of the cylinder body contacts the guide sleeve, the O-ring at the rightmost side of the inner wall at the opening of the cylinder body does not contact the O-ring at the leftmost side of the groove of the raised wall.

6. The pistonless oil cylinder according to claim 1, characterized in that: When the bottom of the inner cavity of the cylinder body contacts the annular raised wall, the opening of the cylinder body does not contact the rear end cover and a gap is left. An oil leakage observation hole is opened on the cylinder body located at the gap.

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