A sealing dustproof structure of a rotary oil cylinder

Abstract

The utility model discloses a sealed dustproof structure of rotary oil cylinder, the right side of sealed assembly no.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary cylinders, and in particular to a sealing and dustproof structure for rotary cylinders. Background Technology

[0002] The rotary cylinder is a core component in a hydraulic system that enables rotary motion and is widely used in the boom rotation mechanism of equipment such as excavators and cranes. Because the piston rod of the cylinder needs to repeatedly extend and retract and withstand rotational torque, its sealing structure must simultaneously meet the requirements of dynamic sealing and dust prevention.

[0003] Existing rotary cylinders use a single-layer sealing ring to prevent dust from the outside of the rotary cylinder from entering the cylinder.

[0004] However, when using a single-layer seal ring to seal a rotary cylinder, the single-layer seal ring is prone to wear due to the high speed of the rotary oil or high temperature environment, resulting in hydraulic oil leakage; secondly, external dust can easily enter the cylinder through the gap between the piston rod and the cylinder body, accelerating the aging of the seal. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, this utility model proposes a sealing and dustproof structure for a rotary cylinder. When it is necessary to seal and prevent dust from the piston rod of the rotary cylinder body, a sealing ring can be fitted onto the piston rod. When hydraulic oil leaks from inside the rotary cylinder body, the sealing ring forms a first seal, and a small amount of leaked hydraulic oil is discharged into the rotary cylinder body through the lip, preventing oil accumulation. Then, a dustproof ring is fitted onto the piston rod and located to the right of the sealing ring. When external dust enters with the extension and retraction of the piston rod, the serrated dustproof texture of the dustproof ring scrapes away large dust particles, while small dust particles are discharged through the groove. Finally, a spring is installed on the right side of the dustproof ring. The spring applies axial preload to the dustproof ring through the mounting seat, compensating for the gap caused by wear of the seal and ensuring that the dustproof ring and piston rod are in close contact for a long time.

[0007] To achieve the above objectives, this utility model proposes a sealing and dustproof structure for a rotary cylinder, comprising a rotary cylinder body, a dustproof device for sealing and preventing dust from the rotary cylinder body at its right end, a piston rod for extension and retraction at the right end of the rotary cylinder body, and a sealing component one fitted inside the rotary cylinder body for sealing the piston rod, a sealing component two for cooperating with the sealing component one to seal and prevent dust from the piston rod at its right side, a spring for pressing the sealing component two at its right side, and a protective component for cooperating with the spring to press the sealing component two at the left end of the rotary cylinder body.

[0008] In addition, the sealing and dustproof structure of the rotary cylinder proposed in this application may also have the following additional technical features:

[0009] Specifically, a motor for driving the piston rod to extend and retract is provided at the left end of the rotary cylinder body.

[0010] Specifically, the top of the motor is provided with two terminals for connecting the motor to power.

[0011] Specifically, the protective assembly includes a mounting base disposed on the right side of the rotary cylinder body for penetrating the piston rod, and four mounting plates are fixedly mounted on the left end of the mounting base.

[0012] Specifically, the four mounting plates are provided with bolts for threaded connection with the rotary cylinder body to mount the mounting base on the right end of the rotary cylinder body.

[0013] Specifically, the sealing assembly includes a sealing ring inserted into the rotary cylinder body for sealing the piston rod, and the left end of the sealing ring has a lip.

[0014] Specifically, the second sealing component includes a dustproof ring disposed on the right side of the sealing ring, and the right end of the dustproof ring has dustproof grooves for cleaning dust from the piston rod.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] By incorporating a protective assembly, a sealing assembly one, a sealing assembly two, and a spring, a sealing ring can be fitted onto the piston rod of the rotary cylinder body when dust sealing is required. When hydraulic oil leaks from inside the rotary cylinder body, the sealing ring forms the first seal, allowing a small amount of leaked hydraulic oil to drain into the rotary cylinder body through the lip, preventing oil accumulation. A dustproof ring is then fitted onto the piston rod, positioned to the right of the sealing ring. As external dust enters with the piston rod's extension and retraction, the serrated dustproof grooves of the dustproof ring scrape away large dust particles, while small dust particles are discharged through the grooves. Finally, a spring is installed to the right of the dustproof ring. The spring applies axial preload to the dustproof ring through the mounting base, compensating for gaps caused by wear in the seals and ensuring a long-term tight fit between the dustproof ring and the piston rod.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the overall structure of a sealing and dustproof structure for a rotary cylinder according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a dustproof device structure for a rotary hydraulic cylinder's sealing and dustproof structure, according to one embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the protective component structure of a sealing and dustproof structure for a rotary cylinder according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of a sealing component of a rotary hydraulic cylinder's sealing and dustproof structure according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the sealing component two of a sealing and dustproof structure for a rotary hydraulic cylinder according to one embodiment of the present invention.

[0024] As shown in the figure: 100, rotary cylinder body; 101, piston rod; 102, terminal block; 103, motor; 200, dustproof device; 210, protective component; 211, mounting base; 212, mounting plate; 213, bolt; 220, sealing component one; 221, sealing ring; 222, lip; 230, sealing component two; 231, dustproof ring; 232, dustproof texture; 240, spring. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0026] The following description, in conjunction with the accompanying drawings, describes a sealing and dustproof structure for a rotary hydraulic cylinder according to an embodiment of the present invention.

[0027] like Figures 1-5As shown, a sealing and dustproof structure for a rotary cylinder according to an embodiment of the present invention may include a rotary cylinder body 100, a dustproof device 200 for sealing and preventing dust from the rotary cylinder body 100 at its right end, and a piston rod 101 for extension and retraction at the right end of the rotary cylinder body 100. The dustproof device 200 includes a sealing component 220 fitted inside the rotary cylinder body 100 for sealing the piston rod 101, a sealing component 230 for cooperating with the sealing component 220 to seal and prevent dust from the piston rod 101 at its right side, a spring 240 for pressing the sealing component 230 at its right side, and a protective component 210 for cooperating with the spring 240 to press the sealing component 230 at the left end of the rotary cylinder body 100. When it is necessary to seal and prevent dust from the piston rod 101 of the rotary cylinder body 100, a sealing ring 221 can be fitted onto the piston rod 101. When hydraulic oil leaks from inside the rotary cylinder body 100, the sealing ring 221 can form a first seal. A small amount of leaked hydraulic oil is discharged into the rotary cylinder body 100 through the lip 222, preventing oil accumulation. Then, a dustproof ring 231 is fitted onto the piston rod 101 and located to the right of the sealing ring 221. When external dust enters with the extension and retraction of the piston rod 101, the serrated dustproof texture 232 of the dustproof ring 231 scrapes away large dust particles, and small dust particles are discharged through the groove. Finally, a spring 240 is installed on the right side of the dustproof ring 231. The spring 240 applies axial preload to the dustproof ring 231 through the mounting seat 211 to compensate for the gap caused by wear of the seal and ensure that the dustproof ring 231 and the piston rod 101 are in close contact for a long time.

[0028] In one embodiment of this utility model, such as Figure 2 As shown, a motor 103 for driving the piston rod 101 to extend and retract is provided at the left end of the rotary cylinder body 100; therefore, when the motor 103 is working, it can drive the piston rod 101 to rotate.

[0029] Furthermore, the top of the motor 103 is provided with two terminals 102 for connecting the motor 103 to power. The two terminals 102 are symmetrically distributed at the top of the motor 103, so an external power source can be used to connect the two terminals 102. Thus, when the external power source is energized, the motor 103 can control the piston rod 101 inside the rotary cylinder body 100 to perform telescopic movement.

[0030] In one embodiment of this utility model, such as Figure 3 , Figure 4 and Figure 5As shown, the protective assembly 210 includes a mounting base 211 located on the right side of the rotary cylinder body 100 for penetrating the piston rod 101. Four mounting plates 212 are fixedly mounted on the left end of the mounting base 211, and the four mounting plates 212 are welded in a rectangular array at the four corners of the mounting base 211.

[0031] Furthermore, the four mounting plates 212 are provided with bolts 213 for threaded connection with the rotary cylinder body 100 to install the mounting seat 211 on the right end of the rotary cylinder body 100. Therefore, the mounting seat 211 can be installed on the right end of the rotary cylinder body 100 by using the threaded connection between the bolts 213 through the four mounting plates 212 and the right end of the rotary cylinder body 100.

[0032] Furthermore, the sealing assembly 220 includes a sealing ring 221 inserted into the rotary cylinder body 100 for sealing the piston rod 101. The sealing ring 221 is made of PTFE material, and a lip 222 is provided at the left end of the sealing ring 221. The lip 222 is inclined to allow a small amount of leaked hydraulic oil to be discharged. A metal skeleton is embedded in the inner wall of the sealing ring 221, and the metal skeleton is made of copper alloy to enhance the rigidity and wear resistance of the lip 222.

[0033] Furthermore, the sealing assembly 230 includes a dustproof ring 231 disposed on the right side of the sealing ring 221. The dustproof ring 231 is made of rubber, such as nitrile rubber. The right end of the dustproof ring 231 has a dustproof groove 232 for cleaning dust from the piston rod 101. The cross-section of the dustproof groove 232 is toothed, the protrusion height of the dustproof groove 232 is 1mm, and the groove width is 2mm, thus it can scrape off the dust adhering to the surface of the piston rod 101. At the same time, the spring 240 is sleeved on the right side of the dustproof ring 231. The mounting base 211 passes through the four mounting plates 212 and is connected to the right end of the rotary cylinder body 100 by bolts 213. One end of the spring 240 abuts against the mounting base 211, and the other end abuts against the dustproof ring 231, applying an axial preload to the dustproof ring 231. Therefore, it can compensate for the gap caused by wear of the seal and ensure that the dustproof ring 231 and the piston rod 101 are in close contact for a long time.

[0034] In summary, the present invention provides a sealing and dustproof structure for a rotary cylinder. When it is necessary to seal and prevent dust from the piston rod 101 of the rotary cylinder body 100, a sealing ring 221 can be fitted onto the piston rod 101. When hydraulic oil leaks from inside the rotary cylinder body 100, the sealing ring 221 forms a first seal, and a small amount of leaked hydraulic oil is discharged into the rotary cylinder body 100 through the lip 222, preventing oil accumulation. Then, a dustproof ring 231 is fitted onto the piston rod 101. The piston rod 101 is located on the right side of the sealing ring 221. When external dust enters as the piston rod 101 extends and retracts, the serrated dustproof texture 232 of the dustproof ring 231 scrapes away large dust particles, and small dust particles are discharged through the groove. Finally, the spring 240 is installed on the right side of the dustproof ring 231. The spring 240 applies axial preload to the dustproof ring 231 through the mounting seat 211 to compensate for the gap caused by the wear of the seal and ensure that the dustproof ring 231 and the piston rod 101 are in close contact for a long time.

[0035] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing and dustproof structure for a rotary hydraulic cylinder, characterized in that, The system includes a rotary cylinder body (100), with a dustproof device (200) for sealing and preventing dust from the rotary cylinder body (100) at its right end; a piston rod (101) for telescopic extension is provided at the right end of the rotary cylinder body (100); the dustproof device (200) includes a sealing component one (220) fitted inside the rotary cylinder body (100) for sealing the piston rod (101); a sealing component two (230) is provided on the right side of the sealing component one (220) for cooperating with the sealing component one (220) to seal and prevent dust from the piston rod (101); a spring (240) is provided on the right side of the sealing component two (230) for pressing the sealing component two (230); and a protective component (210) is provided on the left end of the rotary cylinder body (100) for cooperating with the spring (240) to press the sealing component two (230).

2. The sealing and dustproof structure for a rotary cylinder according to claim 1, characterized in that, The left end of the rotary cylinder body (100) is provided with a motor (103) for driving the piston rod (101) to extend and retract.

3. The sealing and dustproof structure for a rotary cylinder according to claim 2, characterized in that, The top of the motor (103) is provided with two terminals (102) for connecting the motor (103) to power.

4. The sealing and dustproof structure for a rotary cylinder according to claim 1, characterized in that, The protective assembly (210) includes a mounting base (211) disposed on the right side of the rotary cylinder body (100) for penetrating the piston rod (101), and four mounting plates (212) are fixedly mounted on the left end of the mounting base (211).

5. The sealing and dustproof structure for a rotary cylinder according to claim 4, characterized in that, The four mounting plates (212) are provided with bolts (213) for threaded connection with the rotary cylinder body (100) to install the mounting base (211) on the right end of the rotary cylinder body (100).

6. The sealing and dustproof structure for a rotary cylinder according to claim 1, characterized in that, The sealing assembly (220) includes a sealing ring (221) inserted into the rotary cylinder body (100) for sealing the piston rod (101), and the left end of the sealing ring (221) has a lip (222).

7. The sealing and dustproof structure for a rotary cylinder according to claim 6, characterized in that, The second sealing component (230) includes a dustproof ring (231) disposed on the right side of the sealing ring (221), and the right end of the dustproof ring (231) has a dustproof texture (232) for cleaning dust from the piston rod (101).

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