Dustproof hydraulic cylinder with high sealing performance

Abstract

This utility model discloses a high-sealing dustproof hydraulic cylinder, including a cylinder body, an inner dustproof cover, an outer protective cover, and a piston rod placed inside the cylinder body. A guide sleeve is provided between the end of the piston rod and the cylinder body. The guide sleeve consists of an inner guide sleeve and an outer guide sleeve, which are integrally connected, with an insertion gap between them. The inner guide sleeve is placed between the cylinder body and the piston rod, with its outer wall abutting against the inner wall of the cylinder body and its inner wall abutting against the outer wall of the piston rod. The inner wall of the outer guide sleeve abuts against the outer wall of the cylinder body. A limiting step is machined on the exposed section of the piston rod. The outer protective cover is located at the exposed end of the piston rod, with its inner wall abutting against the outer wall of the outer guide sleeve. An inner dustproof cover is provided on the piston rod located inside the outer protective cover and exposed outside the cylinder body. This utility model has a double protective structure, which greatly improves dustproof performance while achieving the protection of the inner dustproof cover.

Description

Technical Field

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

[0002] Existing dustproof sealing technologies for hydraulic cylinders mostly employ a single-layer dustproof structure, resulting in incomplete protection. Large particles of impurities can easily seep in through the gap between the piston rod and the guide sleeve, exacerbating wear on internal components. Furthermore, these dustproof structures often use bellows structures, which are prone to damage from external sand and gravel splashes during actual use, leading to frequent maintenance and replacement. In addition, in traditional structures, the dustproof ring is located inside the guide sleeve, requiring the removal of the guide sleeve for replacement, making maintenance procedures complex and inefficient. Utility Model Content

[0003] The purpose of this invention is to provide a highly sealed dustproof hydraulic cylinder with dual protection functions.

[0004] The purpose of this utility model is achieved as follows: a high-sealing dustproof hydraulic cylinder, including a cylinder body, an inner dustproof cover, an outer protective cover, and a piston rod placed inside the cylinder body;

[0005] A guide sleeve is provided between the piston rod and the end of the cylinder body; the guide sleeve is composed of an inner guide sleeve and an outer guide sleeve, which are integrally connected, and an insertion gap is left between the inner guide sleeve and the outer guide sleeve; the inner guide sleeve is placed between the cylinder body and the piston rod, the outer wall of the inner guide sleeve abuts against the inner wall of the cylinder body, and the inner wall of the inner guide sleeve abuts against the outer wall of the piston rod; the inner wall of the outer guide sleeve abuts against the outer wall of the cylinder body; a limit step is machined on the exposed section of the piston rod;

[0006] The outer protective cover is located at the exposed end of the piston rod, and the inner wall of the outer protective cover abuts against the outer wall of the outer guide sleeve; an inner dust cover is provided on the piston rod located inside the outer protective cover and exposed outside the cylinder body.

[0007] Preferably, multiple sets of dustproof rings are provided on both the outer and inner walls of the outer guide sleeve.

[0008] Preferably, the outer protective cover is a cylindrical structure with one end open, and a through hole is provided at the center of the bottom of the outer protective cover. After the through hole is inserted and engaged with the piston rod, it is fixedly connected to the limiting step by bolts.

[0009] Preferably, the left end of the inner dust cover is provided with a left fixing ring, which is connected to the guide sleeve by bolts. The other end of the inner dust cover is provided with a right fixing ring, which is inserted and connected to the piston rod and abuts against the limiting step, and is then pressed by the outer protective cover.

[0010] Preferably, the piston rod on the right side of the limiting step is threaded, and the outer protective cover is pressed together by a sleeve.

[0011] Compared with the prior art, the advantages of this utility model are:

[0012] 1. This utility model combines an outer protective cover and an inner dust cover. The outer protective cover first intercepts large particles of impurities and resists external collisions, while the inner dust cover provides secondary sealing for the gap between the piston rod and the guide sleeve. The dual protection forms a three-dimensional dust barrier, effectively reducing the entry of dust into the hydraulic cylinder, reducing the risk of wear on the guide sleeve and piston rod, and improving sealing reliability.

[0013] 2. The dustproof ring is located on the outside of the guide sleeve, making maintenance and replacement more convenient and quick. The dustproof ring on the inner wall of the outer guide sleeve, together with the dustproof ring on the outer wall of the inner guide sleeve and the sealing ring, form a multiple seal, which can divert dustproof pressure, reduce the wear rate of a single set of dustproof rings, significantly reduce the replacement frequency, and extend the service life of sealing components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] The components include: 1. Cylinder block; 2. Inner dust cover; 201. Left fixing ring; 202. Right fixing ring; 3. Outer protective cover; 4. Piston rod; 401. Limiting step; 5. Guide sleeve; 501. Inner guide sleeve; 502. Outer guide sleeve; 503. Insertion gap; 6. Dust cover; 7. Sleeve. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] 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.

[0019] like Figure 1 As shown, a high-sealing dustproof hydraulic cylinder includes a cylinder body 1, an inner dustproof cover 2, an outer protective cover 3, and a piston rod 4 placed inside the cylinder body 1;

[0020] A guide sleeve 5 is provided between the piston rod 4 and the end of the cylinder 1; the guide sleeve 5 is composed of an inner guide sleeve 501 and an outer guide sleeve 502, the inner guide sleeve 501 and the outer guide sleeve 502 are integrally connected, and an insertion gap 503 is left between the inner guide sleeve 501 and the outer guide sleeve 502; the inner guide sleeve 501 is placed between the cylinder 1 and the piston rod 4, the outer wall of the inner guide sleeve 501 abuts against the inner wall of the cylinder 1, and the inner wall of the inner guide sleeve 501 abuts against the outer wall of the piston rod 4; the inner wall of the outer guide sleeve 502 abuts against the outer wall of the cylinder 1; a limiting step 401 is machined on the exposed section of the piston rod 4;

[0021] An outer protective cover 3 is located at the exposed end of the piston rod 4, and the inner wall of the outer protective cover 3 abuts against the outer wall of the outer guide sleeve 502. An inner dust cover is provided on the piston rod located inside the outer protective cover 3 and exposed outside the cylinder body. The inner dust cover is located inside the outer protective cover, which further protects the part of the piston rod exposed outside the cylinder body from dust. The two work together to achieve double dust protection, effectively improve the dust protection performance of the hydraulic cylinder, reduce the wear of impurities on internal components, and extend the service life of the hydraulic cylinder.

[0022] like Figure 1 As shown, multiple sets of dustproof rings 6 are provided on the outer and inner walls of the outer guide sleeve 502, which can prevent larger dust particles and impurities from entering the hydraulic cylinder.

[0023] like Figure 1 As shown, the outer protective cover 3 is a cylindrical structure with one end open. The bottom center of the outer protective cover 3 has a through hole. After the through hole is inserted and fitted with the piston rod 4, it is fixedly connected to the limiting step 401 by bolts. The connection method is simple in structure and easy to disassemble and assemble.

[0024] like Figure 1As shown, the left end of the inner dust cover 2 is provided with a left fixing ring 201, which is connected to the guide sleeve 5 by bolts. The other end of the inner dust cover 2 is provided with a right fixing ring 202. The right fixing ring 202 is inserted and connected to the piston rod 4 and abuts against the limiting step, and is pressed by the outer protective cover. This ensures that the inner dust cover can remain stable during the reciprocating motion of the piston rod and will not shift or fall off. At the same time, it is easy to install and disassemble, and is convenient for later maintenance and replacement.

[0025] like Figure 1 As shown, the piston rod on the right side of the limiting step 401 is threaded, and the outer protective cover 3 is pressed by the sleeve 7; the thread on the piston rod, in conjunction with the sleeve, can further press the outer protective cover onto the limiting step, enhancing the tightness of the connection between the outer protective cover and the piston rod, and facilitating subsequent disassembly.

[0026] The working principle of this utility model is explained as follows: When the hydraulic cylinder is working, the piston rod reciprocates along the cylinder axis, and the inner guide sleeve ensures its coaxiality. The outer protective cover first intercepts large particles and impacts from the outside. Its inner wall fits against the outer wall of the outer guide sleeve, and together with the dustproof ring on the outer wall of the outer guide sleeve, it blocks impurities from entering through the gap between the two. The dustproof ring on the inner wall of the outer guide sleeve further seals the gap between the cylinder and the outer guide sleeve. At the same time, the inner dustproof cover forms secondary protection for the exposed section of the piston rod inside the protective cover. Multiple structures work together to achieve comprehensive dust protection.

[0027] 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-sealing, dustproof hydraulic cylinder, characterized in that, Includes the cylinder block, inner dust cover, outer protective cover, and piston rod placed inside the cylinder block; A guide sleeve is provided between the piston rod and the end of the cylinder body; the guide sleeve is composed of an inner guide sleeve and an outer guide sleeve, which are integrally connected, and an insertion gap is left between the inner guide sleeve and the outer guide sleeve; the inner guide sleeve is placed between the cylinder body and the piston rod, the outer wall of the inner guide sleeve abuts against the inner wall of the cylinder body, and the inner wall of the inner guide sleeve abuts against the outer wall of the piston rod; the inner wall of the outer guide sleeve abuts against the outer wall of the cylinder body; a limiting step is machined on the exposed section of the piston rod; The outer protective cover is located at the exposed end of the piston rod, and the inner wall of the outer protective cover abuts against the outer wall of the outer guide sleeve; an inner dust cover is provided on the piston rod located inside the outer protective cover and exposed outside the cylinder body.

2. The high-sealing dustproof hydraulic cylinder according to claim 1, characterized in that, Multiple dustproof rings are provided on both the outer and inner walls of the outer guide sleeve.

3. The high-sealing dustproof hydraulic cylinder according to claim 1, characterized in that, The outer protective cover is a cylindrical structure with one end open. The bottom center of the outer protective cover has a through hole. After the through hole is inserted and fitted with the piston rod, it is fixedly connected to the limiting step by bolts.

4. A high-sealing dustproof hydraulic cylinder according to claim 1, characterized in that, The inner dust cover has a left fixing ring at the left end, which is connected to the guide sleeve by bolts. The inner dust cover has a right fixing ring at the other end. The right fixing ring is inserted and connected to the piston rod and comes into contact with the limiting step, and is then pressed by the outer protective cover.

5. A high-sealing dustproof hydraulic cylinder according to claim 1, characterized in that, The piston rod on the right side of the limiting step is threaded, and the outer protective cover is pressed together by a sleeve.

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