Swing cylinder leak-proof sealing structure

Abstract

The utility model discloses a swing oil cylinder leak protection oil seal structure relates to hydraulic cylinder technical field, and it is including: cylinder barrel, rotor shaft, end cover, sealing assembly. Form the hydraulic cavity in cylinder barrel, and rotor shaft is rotatoryly installed in cylinder barrel, and end cover fixed connection is in rotor shaft end, and the outer periphery side of end cover is with the inner wall of cylinder barrel and is in contact, and the one end of end cover is connected with magnetic ring close to the hydraulic cavity, and the lateral wall of cylinder barrel is provided with the blow-off portion of communication with the hydraulic cavity, and sealing assembly is around and is set up in the outer peripheral wall of end cover, and sealing assembly is used for sealing the clearance between end cover and the inner wall of cylinder barrel. The utility model can prevent metal scrap with hydraulic oil and enter sealing assembly, and prolong the service life of sealing assembly.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a leak-proof sealing structure for a swing cylinder. Background Technology

[0002] A swing cylinder is an actuator that converts hydraulic energy into reciprocating rotary motion at a limited angle, widely used in engineering machinery, agricultural equipment, and industrial automation. In the field of aerial work platforms, swing cylinders are generally used for swinging the work platform. The cylinder barrel is typically fixed to the main boom or jib of the aerial work platform, while the intermediate rotor is connected to the work platform. The swing cylinder must withstand both axial and radial loads. Existing swing cylinder sealing structures generally consist of a dumbbell dust seal, a support pad, a main seal, and a support ring. The dumbbell dust seal prevents external water and impurities from entering the cylinder, the support pad bears the axial load, the main seal prevents leakage of internal high-pressure media, and the support ring bears the radial load. In existing technology, metal debris generated during the swing cylinder's operation accumulates at the main seal, causing abnormal wear and leading to oil leakage. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a leak-proof sealing structure for a swing cylinder, which can prevent metal debris from entering the sealing assembly with the hydraulic oil, thereby extending the service life of the sealing assembly.

[0004] A leak-proof sealing structure for a swing cylinder according to a first aspect of this utility model includes: a cylinder barrel, a rotor shaft, an end cover, and a sealing assembly. A hydraulic chamber is formed within the cylinder barrel; the rotor shaft is rotatably mounted within the cylinder barrel; the end cover is fixedly connected to the end of the rotor shaft, with its outer periphery abutting against the inner wall of the cylinder barrel; a magnetic ring is connected to one end of the end cover near the hydraulic chamber; a drain portion communicating with the hydraulic chamber is provided on the side wall of the cylinder barrel; the sealing assembly is arranged around the outer periphery of the end cover, and the sealing assembly is used to seal the gap between the end cover and the inner wall of the cylinder barrel.

[0005] According to an embodiment of the present invention, a leak-proof sealing structure for a swing cylinder has at least the following beneficial effects: the sealing assembly seals the gap between the end cap and the inner wall of the cylinder. The magnetic ring attracts metal debris in the hydraulic chamber, preventing hard, sharp-edged metal debris from entering the sealing assembly with the hydraulic oil, thus avoiding metal debris embedding and wear on the sealing assembly and extending its service life. It protects the sealing assembly from damage by metal debris in the hydraulic oil, ensuring effective sealing of the gap between the end cap and the cylinder, and preventing hydraulic oil leakage.

[0006] According to some embodiments of the present invention, the sealing assembly includes a first support ring, a main seal, and a second support ring arranged sequentially from the inside to the outside.

[0007] According to some embodiments of the present invention, a grease injection channel is provided on the side of the end cap away from the hydraulic chamber, and the grease injection channel is used to provide grease to the second support ring.

[0008] According to some embodiments of the present invention, one end of the end cap extending out of the cylinder is connected to a cover plate portion, and a support pad is provided between the cover plate portion and the end of the cylinder.

[0009] According to some embodiments of the present invention, the grease injection channel can also provide grease to the support pad.

[0010] According to some embodiments of the present invention, an annular dustproof cylinder is further provided at the end of the cylinder, and a dumbbell-shaped dustproof ring is provided between the inner wall of the annular dustproof cylinder and the cover plate.

[0011] According to some embodiments of the present invention, the sealing assembly further includes a dirt-collecting ring, which is located between the magnetic ring and the first support ring.

[0012] According to some embodiments of the present invention, the drain section includes a drain hole and a plug. The drain hole is opened on the side wall of the cylinder and communicates with the hydraulic chamber. The plug is detachably connected to the drain hole and is used to seal the drain hole.

[0013] According to some embodiments of the present invention, a plurality of drain holes are uniformly arranged along the radial direction of the cylinder.

[0014] According to some embodiments of this utility model, the distance between the drain hole and the magnetic ring does not exceed 5mm.

[0015] 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

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a cross-sectional schematic diagram of the installation structure according to an embodiment of the present utility model; Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0017] Icon labels: Cylinder 100, hydraulic chamber 110, annular dustproof sleeve 120, dumbbell dustproof ring 121; Rotor shaft 200; End cap 300, grease injection channel 310, cover plate 320, support pad 321; Magnetic ring 400; Sewage discharge section 500, sewage discharge hole 510, plug 520; Sealing assembly 600, first support ring 610, main seal 620, second support ring 630, and dirt-collecting ring 640. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0020] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 and Figure 2As shown, an embodiment of the present invention provides an oil leakage prevention and sealing structure for a swing cylinder, comprising: a cylinder 100, a rotor shaft 200, an end cover 300, and a sealing assembly 600. A hydraulic chamber 110 is formed within the cylinder 100; the rotor shaft 200 is rotatably mounted within the cylinder 100; the end cover 300 is fixedly connected to the end of the rotor shaft 200, with its outer periphery abutting against the inner wall of the cylinder 100. A magnetic ring 400 is connected to one end of the end cover 300 near the hydraulic chamber 110, and the magnetic ring 400 is bolted inside the end cover 300. The outer diameter of the magnetic ring 400 matches the inner diameter of the cylinder 100, ensuring that the distance between the magnetic ring 400 and the inner wall of the cylinder 100 does not exceed 1 mm. During operation of the oscillating cylinder, the internal helical components, such as screws, nuts, or ball screws, inevitably rub against each other, generating metal debris. The magnetic ring 400 adsorbs this metal debris generated during operation within the hydraulic chamber 110. A drain section 500, communicating with the hydraulic chamber 110, is provided on the side wall of the cylinder 100. After a fixed service life of the oscillating cylinder, it is not necessary to disassemble the entire cylinder or end cap 300. The metal debris adsorbed by the magnetic ring 400 is discharged through the drain section 500 using the flow of hydraulic oil. This simplifies the maintenance process of cleaning metal debris from the magnetic ring 400, saving maintenance time and costs. A sealing assembly 600 is arranged around the outer peripheral wall of the end cap 300. The sealing assembly 600 seals the gap between the end cap 300 and the inner wall of the cylinder 100. Movement and friction occur between the end cap 300 and the cylinder 100; therefore, the sealing assembly 600 is used to seal and prevent hydraulic oil leakage. The magnetic ring 400 attracts metal debris, preventing hard, sharp-edged metal debris from entering the sealing assembly 600 with the hydraulic oil. This avoids metal debris embedding and wear on the sealing assembly 600, extending its service life. It also protects the sealing assembly 600 from damage by metal debris in the hydraulic oil, ensuring an effective seal between the end cap 300 and the cylinder 100, preventing hydraulic oil leakage. The continuous attraction of metal debris by the magnetic ring 400 also prevents metal debris from entering the hydraulic pump, control valves, and other sealing systems, improving the overall service life of the hydraulic system.

[0023] Reference Figure 1 and Figure 2As shown, the sealing assembly 600 includes a first support ring 610, a main seal 620, and a second support ring 630 arranged sequentially from the inside out. The first support ring 610 and the second support ring 630 are made of materials with self-lubricating properties, such as polytetrafluoroethylene or polyimide. The first support ring 610 and the second support ring 630 directly contact the inner wall of the cylinder 100, bearing the radial friction during the rotation of the end cap 300. The function of the first support ring 610 and the second support ring 630 is to radially support the end cap 300 and reduce the frictional force during the rotation of the end cap 300. The material hardness of the second support ring 630 is higher than that of the first support ring 610. The first support ring 610 preferentially contacts the inner wall of the cylinder 100 to deform and utilize its own lubrication to reduce friction, while the stronger second support ring 630 can withstand greater radial loads. Compared to using a single support ring, the combination of the first support ring 610 and the second support ring 630 improves the radial positioning accuracy and stability of the end cap 300 within the cylinder 100, reduces radial runout or sway of the end cap 300 during rotation, and thus enhances the ability of the oscillating cylinder to withstand radial loads. The main seal 620 is made of rubber and serves to prevent hydraulic oil leakage. It is foreseeable that multiple annular grooves will be provided around the end cap 300 to accommodate the installation of the first support ring 610, the main seal 620, and the second support ring 630.

[0024] Reference Figure 1 and Figure 2 As shown, it can be understood that a grease injection channel 310 is provided on the side of the end cap 300 away from the hydraulic chamber 110. The grease injection channel 310 is used to provide grease to the second support ring 630. Since the second support ring 630 is located outside the main seal 620 and is isolated from the hydraulic chamber 110 by the main seal 620, the second support ring 630 is not lubricated by hydraulic oil. The second support ring 630 experiences greater wear than the first support ring 610. Therefore, a grease injection channel 310 is provided on the end cap 300. The grease injection channel 310 extends into the annular groove corresponding to the installation of the second support ring 630, so as to provide grease to the second support ring 630 during maintenance, avoid abnormal wear of the second support ring 630 due to dry friction, and extend the service life of the second support ring 630.

[0025] Reference Figure 1 and Figure 2As shown, it can be understood that the end of the end cap 300 extending out of the cylinder 100 is connected to a cover plate portion 320, which is integrally formed with the end cap 300. A support pad 321 is provided between the cover plate portion 320 and the end of the cylinder 100. The support pad 321 is made of a material with self-lubricating properties, such as polytetrafluoroethylene or polyimide. The cover plate portion 320 and the end of the cylinder 100 cooperate to provide axial positioning for the end cap 300. The support pad 321 between the cover plate portion 320 and the cylinder 100 reduces radial friction when the end cap 300 rotates.

[0026] Reference Figure 1 and Figure 2 As shown, it can be understood that the grease injection channel 310 can also provide grease to the support pad 321. Since the support pad 321 is located outside the main seal 620 and isolated from the hydraulic chamber 110 by the main seal 620, the support pad 321 does not have hydraulic oil for lubrication, resulting in greater wear on the support pad 321. Therefore, a grease injection channel 310 is provided on the end cover 300, extending to the support pad 321 to facilitate the supply of grease to the support pad 321 during maintenance, preventing abnormal wear of the support pad 321 due to dry friction and extending the service life of the support pad 321.

[0027] Reference Figure 1 and Figure 2 As shown, it can be understood that an annular dustproof sleeve 120 is also provided at the end of the cylinder 100, and the annular dustproof sleeve 120 is integrally formed with the cylinder 100. A dumbbell dustproof ring 121 is provided between the inner wall of the annular dustproof sleeve 120 and the cover plate portion 320. The dumbbell dustproof ring 121 is made of polyurethane material. The sealing assembly 600 may be damaged not only by internal metal debris, but also by external dust. Therefore, the annular dustproof sleeve 120 and the dumbbell dustproof ring 121 are provided to shield external dust, mud, water and other solid contaminants, prevent dust, mud and water and other solid contaminants from entering the sealing assembly 600, and improve the service life of the sealing assembly 600. It protects the sealing assembly 600 from damage by external solid contaminants and ensures that the sealing assembly 600 effectively seals the gap between the end cover 300 and the cylinder 100.

[0028] Reference Figure 1 and Figure 2As shown, the sealing assembly 600 also includes a dirt-collecting ring 640, which is made of filled polytetrafluoroethylene (PTFE) material. The specific structure of the dirt-collecting ring 640 is existing technology. The dirt-collecting ring 640 is located between the magnetic ring 400 and the first support ring 610. The dirt-collecting ring 640 has excellent adsorption capacity for metal debris and non-metallic particles generated during the operation of the helical pair of the swing cylinder, preventing metal debris from entering the main seal 620 and reducing abnormal wear of the main seal 620. The magnetic ring 400 only adsorbs ferromagnetic metal debris and is ineffective against non-metallic contaminants. Therefore, the dirt-collecting ring 640 is used to adsorb non-magnetic contaminants. The dirt-collecting ring 640 and the magnetic ring 400 form a dual adsorption effect, more effectively intercepting contaminants.

[0029] Reference Figure 1 and Figure 2 As shown, the drain section 500 includes a drain hole 510 and a plug 520. The drain hole 510 is located on the side wall of the cylinder 100 and communicates with the hydraulic chamber 110. The drain hole 510 has threads inside. The plug 520 is threaded into the drain hole 510 and is used to seal the drain hole 510. During maintenance, the plug 520 is removed, and then a flushing hose is threaded into the drain hole 510. The hose is connected to a flushing device, which uses high-flow-rate pulsed hydraulic oil to flush away the metal debris adsorbed on the magnetic ring 400. Without disassembling the cylinder 100 or end cap 300, the plug 520 can be unscrewed to flush the contaminants accumulated on the magnetic ring 400, resulting in a short operation time.

[0030] Reference Figure 1 and Figure 2 As shown, it can be understood that four drain holes 510 are evenly arranged radially along the cylinder barrel 100. The radially distributed drain holes 510 cover a 360° range, corresponding to the entire circumferential adsorption area of ​​the magnetic ring 400, thus preventing debris from accumulating at the far end when draining from a single drain hole 510. This improves the debris removal efficiency.

[0031] Reference Figure 1 and Figure 2 As shown, it can be understood that the distance between the drain hole 510 and the magnetic ring 400 does not exceed 5mm. The closer the metal debris adsorbed on the magnetic ring 400 is to the drain hole 510, the easier it is to be discharged.

[0032] Working principle: During the operation of the oscillating cylinder, metal debris generated during the operation of the helical pair is adsorbed by the magnetic ring 400, forming a debris layer on the magnetic ring 400. Escaping non-magnetic particles are adsorbed by the filled PTFE nano-dirt ring 640, preventing contaminants from entering the first support ring 610 and the main seal 620. The first support ring 610 and the second support ring 630 jointly support the rotation of the end cover 300, improving the radial load bearing capacity. The drain hole 510 allows for easy connection to flushing equipment to wash the debris layer formed on the magnetic ring 400. During maintenance, grease is supplied to the second support ring 630 and the support pad 321 through the grease injection channel 310, further reducing friction.

[0033] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A leak-proof sealing structure for a swing cylinder, characterized in that, include: Cylinder (100), wherein a hydraulic chamber (110) is formed inside the cylinder (100); The rotor shaft (200) is rotatably mounted inside the cylinder (100); An end cap (300) is fixedly connected to the end of the rotor shaft (200). The outer periphery of the end cap (300) abuts against the inner wall of the cylinder (100). A magnetic ring (400) is connected to one end of the end cap (300) near the hydraulic chamber (110). A drain section (500) communicating with the hydraulic chamber (110) is provided on the side wall of the cylinder (100). A sealing assembly (600) is disposed around the outer peripheral wall of the end cap (300) for sealing the gap between the end cap (300) and the inner wall of the cylinder (100).

2. The anti-leakage sealing structure for the swing cylinder according to claim 1, characterized in that: The sealing assembly (600) includes a first support ring (610), a main seal (620), and a second support ring (630) arranged sequentially from the inside to the outside.

3. The anti-leakage sealing structure for the swing cylinder according to claim 2, characterized in that: The end cap (300) is provided with a grease injection channel (310) on the side away from the hydraulic chamber (110), the grease injection channel (310) being used to provide grease to the second support ring (630).

4. The anti-leakage sealing structure for the swing cylinder according to claim 3, characterized in that: The end cap (300) extends out of the cylinder (100) and is connected to a cover plate (320). A support pad (321) is provided between the cover plate (320) and the end of the cylinder (100).

5. The anti-leakage sealing structure for the swing cylinder according to claim 4, characterized in that: The grease injection channel (310) can also provide grease to the support pad (321).

6. The anti-leakage sealing structure for the swing cylinder according to claim 4, characterized in that: The end of the cylinder (100) is also provided with an annular dustproof cylinder (120), and a dumbbell dustproof ring (121) is provided between the inner wall of the annular dustproof cylinder (120) and the cover plate (320).

7. The anti-leakage sealing structure for the swing cylinder according to claim 1, characterized in that: The sealing assembly (600) further includes a dirt-collecting ring (640) located between the magnetic ring (400) and the first support ring (610).

8. The anti-leakage sealing structure for the swing cylinder according to claim 1, characterized in that: The drain section (500) includes a drain hole (510) and a plug (520). The drain hole (510) is opened on the side wall of the cylinder (100) and communicates with the hydraulic chamber (110). The plug (520) is detachably connected to the drain hole (510) and is used to seal the drain hole (510).

9. The anti-leakage sealing structure for the swing cylinder according to claim 8, characterized in that: Multiple drain holes (510) are evenly arranged radially along the cylinder (100).

10. The anti-leakage sealing structure for the swing cylinder according to claim 8, characterized in that: The distance between the drain hole (510) and the magnetic ring (400) shall not exceed 5 mm.

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