Hydraulic oil cylinder sealing assembly with anti-leakage early warning function

Abstract

The hydraulic oil cylinder sealing assembly with the anti-leakage early warning function comprises an oil cylinder shell, a hydraulic piston is slidably connected into the oil cylinder shell, a driving rod is fixedly mounted at the top of the hydraulic piston and penetrates through the top wall of the oil cylinder shell, a movable mounting ring is fixedly mounted at the top of the driving rod, and the movable mounting ring is fixedly mounted at the top of the hydraulic piston and penetrates through the top wall of the oil cylinder shell. The inner sealing ring is fixedly mounted at the bottom of the middle sealing ring, the outer sealing ring is fixedly mounted at the top of the middle sealing ring, and the driving rod penetrates through the interiors of the inner sealing ring, the middle sealing ring and the outer sealing ring. According to the hydraulic oil cylinder sealing assembly with the leakage-proof early warning function, through the double leakage-proof design of the leakage-proof assembly, when the inner wall leaks, hydraulic oil pushes the elastic rubber ring to expand and seal, and when the outer wall leaks, the hydraulic oil drives the movable sealing ring to press and seal, automatic compensation sealing after leakage is achieved, leakage expansion is effectively prevented, and the sealing reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic cylinder sealing, in particular to a hydraulic cylinder sealing assembly with anti-leakage early warning function. BACKGROUND

[0002] As the core executive element in hydraulic systems, hydraulic cylinders are widely used in engineering machinery, industrial production, transportation and other fields. The sealing assembly is a key component of the hydraulic cylinder, and its sealing performance directly affects the working efficiency and service life of the hydraulic cylinder.

[0003] The current market hydraulic cylinder sealing assembly mostly adopts single or double sealing ring structure, and the sealing form is relatively simple. In the long-term high pressure, high frequency reciprocating motion working environment, the sealing assembly is easy to appear the problems such as wear and aging, which leads to hydraulic oil leakage. Once the leakage occurs, not only will cause the pressure loss of hydraulic system, the working efficiency is reduced, but also may cause a series of problems such as equipment failure, environmental pollution.

[0004] At the same time, the existing sealing assembly lacks effective anti-leakage compensation mechanism, and cannot prevent the leakage from expanding in time after the leakage occurs. And most of the sealing assemblies are not equipped with leakage early warning function, so it is difficult for the workers to detect the signs of sealing failure in advance, and they can only find out the problem after the leakage is serious, at this time, it has caused certain economic loss and safety hidden trouble. In addition, the installation and maintenance of the traditional sealing assembly are not convenient, and more structures need to be disassembled when replacing the sealing parts, which affects the normal use of the equipment.

[0005] Therefore, the present application provides a hydraulic cylinder sealing assembly with anti-leakage early warning function to solve the above problems. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a hydraulic cylinder sealing assembly with anti-leakage early warning function to solve the above problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic cylinder sealing assembly with a leak-proof early warning function, comprising a cylinder housing, a hydraulic piston slidably connected inside the cylinder housing, a drive rod fixedly mounted on the top of the hydraulic piston, the drive rod passing through the top wall of the cylinder housing, a movable mounting ring fixedly mounted on the top of the drive rod, a fixed mounting ring fixedly mounted on the bottom of the cylinder housing, a sealing assembly disposed on the top of the cylinder housing and outside the drive rod, and an leak-proof component and an early warning component disposed inside the sealing assembly. The assembly includes an inner sealing ring, a middle sealing ring, and an outer sealing ring. The inner sealing ring is fixedly installed at the bottom of the middle sealing ring, and the outer sealing ring is fixedly installed at the top of the middle sealing ring. The drive rod passes through the interior of the inner sealing ring, the middle sealing ring, and the outer sealing ring. The middle sealing ring is fixedly installed inside the top wall of the cylinder housing. The inner sealing ring is attached to the inner top wall of the cylinder housing, and the outer sealing ring is attached to the outer top of the cylinder housing. Two hydraulic oil connectors are fixedly installed on the side of the drive rod, with the upper and lower hydraulic oil connectors located on the upper and lower sides of the hydraulic piston, respectively.

[0008] Preferably, the leak-proof component includes a first groove, which is formed on the inner wall of the central sealing ring and penetrates the inner wall of the central sealing ring. A first annular groove is formed inside the outer sealing ring and penetrates the inner wall of the outer sealing ring. A first connecting pipe is formed between the first groove and the first annular groove and connects the interior of the first groove and the first annular groove.

[0009] Preferably, an elastic rubber ring is fixedly installed on the inner wall of the first annular groove. The elastic rubber ring is attached to the outer side of the drive rod. When the inner wall of the sealing assembly leaks, the hydraulic oil enters the first annular groove through the first groove and the first connecting pipe and squeezes the elastic rubber ring outward to ensure that the hydraulic oil does not leak through the inner wall of the sealing assembly.

[0010] Preferably, the outer sealing ring has a second annular groove inside, a movable sealing ring is slidably connected inside the second annular groove, a spring is fixedly installed between the top of the movable sealing ring and the inner top of the second annular groove, and the bottom of the movable sealing ring is attached to the top of the cylinder housing.

[0011] Preferably, the middle sealing ring has a second groove inside, the second groove is formed inside the outer wall of the middle sealing ring, the outside of the second groove penetrates the outer wall of the middle sealing ring, and a second connecting pipe is formed between the second groove and the second annular groove, the second connecting pipe connecting the inside of the second groove and the second annular groove.

[0012] Preferably, when the outer wall of the sealing assembly leaks, the hydraulic oil enters the second groove and then enters the second annular groove through the second connecting pipe, pressing down on the moving sealing ring. The moving sealing ring presses down on the top of the cylinder housing to ensure that the hydraulic oil does not leak through the outer wall of the sealing assembly.

[0013] Preferably, the early warning component includes a hydraulic sensor, which is fixedly installed on the top of the external sealing ring. A detection tube is fixedly installed at the detection end of the hydraulic sensor, and an external tube is fixedly installed at the front end of the detection tube, with the external tube communicating with the detection tube.

[0014] Preferably, the external tube is divided into two parts, left and right, both of which are inserted into the outer sealing ring. The outer external tube communicates with the inside of the second annular groove, and the inner external tube communicates with the inside of the first annular groove.

[0015] Beneficial effects

[0016] This invention provides a hydraulic cylinder sealing assembly with a leak prevention and early warning function. Compared with the prior art, it has the following advantages:

[0017] 1. This hydraulic cylinder sealing assembly with leakage prevention and early warning function uses a dual leakage prevention design. When the inner wall leaks, the hydraulic oil pushes the elastic rubber ring to expand and seal. When the outer wall leaks, the hydraulic oil drives the moving sealing ring to press and seal, thus achieving automatic compensation sealing after leakage, effectively preventing leakage from expanding and improving sealing reliability.

[0018] 2. This hydraulic cylinder sealing assembly with leakage prevention and early warning function uses a hydraulic sensor to detect the hydraulic pressure changes in the two annular grooves in real time. It can issue an early warning signal when there is a slight leak in the sealing assembly, so that staff can check and maintain it in advance and avoid serious losses caused by leakage.

[0019] 3. The hydraulic cylinder sealing assembly with anti-leakage warning function adopts a three-section splicing structure of internal, middle and external sections. During installation, the middle sealing ring is directly embedded into the top wall of the cylinder shell, and the internal and external sealing rings are fixedly connected to the middle sealing ring. Disassembly and replacement are convenient, reducing maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1This is a perspective view of the external structure of the present invention;

[0022] Figure 2 This is a three-dimensional view of the internal overall structure of the present invention;

[0023] Figure 3 This is the invention Figure 2 Enlarged view of the structure at point A in the middle;

[0024] Figure 4 This is a perspective view of the internal cross-sectional structure of the present invention;

[0025] Figure 5 This is the invention Figure 4 Enlarged view of the structure at point B.

[0026] In the diagram: 1. Cylinder housing; 2. Sealing assembly; 21. Inner sealing ring; 22. Middle sealing ring; 23. Outer sealing ring; 3. Leakage prevention assembly; 31. First groove; 32. First connecting pipe; 33. First annular groove; 34. Elastic rubber ring; 35. Second groove; 36. Second connecting pipe; 37. Second annular groove; 38. Movable sealing ring; 39. Spring; 4. Warning assembly; 41. Outer pipe; 42. Detection pipe; 43. Hydraulic sensor; 5. Drive rod; 6. Movable mounting ring; 7. Fixed mounting ring; 8. Hydraulic oil connector; 9. Hydraulic piston. Detailed Implementation

[0027] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0028] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Reference Figures 1 to 5This application provides a hydraulic cylinder sealing assembly with a leakage prevention and early warning function, including a cylinder housing 1. The cylinder housing 1 is made of high-strength alloy steel, which has excellent compressive strength and corrosion resistance, and can withstand the high-pressure working environment of the hydraulic system, avoiding deformation or rust after long-term use. A hydraulic piston 9 is slidably connected inside the cylinder housing 1. The hydraulic piston 9 is made of wear-resistant cast iron, and the surface is quenched, resulting in high hardness and strong wear resistance, which can reduce friction loss with the inner wall of the cylinder housing 1 and extend its service life. A drive rod 5 is fixedly installed on the top of the hydraulic piston 9 by welding. The welding is carried out by argon arc welding, and the weld is firm, ensuring a stable connection between the drive rod 5 and the hydraulic piston 9, and effectively transmitting power. The drive rod 5 passes through the top wall of the cylinder housing 1. The drive rod 5 is made of high-strength alloy round steel, which has good rigidity and toughness, and avoids bending or breakage during reciprocating motion.

[0030] A movable mounting ring 6 is bolted to the top of the drive rod 5, and a fixed mounting ring 7 is bolted to the bottom of the cylinder housing 1. Both the movable mounting ring 6 and the fixed mounting ring 7 are forged carbon steel parts with galvanized surface treatment, providing excellent rust resistance and facilitating the fixed connection of the hydraulic cylinder to external equipment. A sealing assembly 2 is located on the top of the cylinder housing 1 and outside the drive rod 5. The sealing assembly 2 contains a leak-proof assembly 3 and a warning assembly 4. The sealing assembly 2 includes an internal sealing ring 21, a middle sealing ring 22, and an external sealing ring 23. Both the internal sealing ring 21 and the external sealing ring 23 are made of fluororubber, which is resistant to high temperatures, oil, and aging, making it suitable for long-term use in hydraulic oil. The middle sealing ring 22 is made of engineering plastic, which has high mechanical strength and can provide stable support for the internal and external sealing rings 23.

[0031] The inner sealing ring 21 is fixedly installed at the bottom of the middle sealing ring 22 through a vulcanization process, and the outer sealing ring 23 is fixedly installed at the top of the middle sealing ring 22 through a vulcanization process. The connection is tight and not easy to fall off. The drive rod 5 passes through the interior of the inner sealing ring 21, the middle sealing ring 22 and the outer sealing ring 23. The middle sealing ring 22 is fixedly installed inside the top wall of the cylinder housing 1 through an interference fit. The installation is convenient and the fixation is reliable. The inner sealing ring 21 is attached to the inner top wall of the cylinder housing 1, and the outer sealing ring 23 is attached to the outer top of the cylinder housing 1, forming a double sealing structure to improve the initial sealing effect. Two hydraulic oil connectors 8 are fixedly installed on the side of the drive rod 5 through a threaded connection. The upper and lower hydraulic oil connectors 8 are located on the upper and lower sides of the hydraulic piston 9, respectively. The hydraulic oil connectors 8 are standard hydraulic connectors with good sealing performance and are easy to connect to external hydraulic pipelines.

[0032] The anti-leakage component 3 includes a first groove 31, which is formed on the inner wall of the central sealing ring 22. The inner wall of the first groove 31 penetrates the inner wall of the central sealing ring 22. A first annular groove 33 is formed inside the outer sealing ring 23. The inner wall of the first annular groove 33 penetrates the inner wall of the outer sealing ring 23. A first connecting pipe 32 is formed between the first groove 31 and the first annular groove 33. The first connecting pipe 32 connects the interior of the first groove 31 and the first annular groove 33. The first connecting pipe 32 is processed by drilling, and the channel is smooth, which facilitates the smooth flow of hydraulic oil.

[0033] An elastic rubber ring 34 is fixedly installed on the inner wall of the first annular groove 33 by adhesive. The elastic rubber ring 34 is made of polyurethane rubber, which has good elasticity and excellent wear resistance. The elastic rubber ring 34 is attached to the outside of the drive rod 5. In the initial state, it is slightly attached to the drive rod 5. When the inner wall of the sealing component 2 leaks, the hydraulic oil enters the first annular groove 33 through the first groove 31 and the first connecting pipe 32. The pressure of the hydraulic oil is used to squeeze the elastic rubber ring 34 outward and expand it, so that the elastic rubber ring 34 is tightly attached to the outside of the drive rod 5, forming a secondary seal and ensuring that the hydraulic oil will not leak through the inner wall of the sealing component 2.

[0034] The outer sealing ring 23 has a second annular groove 37 inside, and a movable sealing ring 38 is slidably connected inside the second annular groove 37. The movable sealing ring 38 is made of wear-resistant rubber, with a smooth surface and low sliding resistance. A spring 39 is fixedly installed between the top of the movable sealing ring 38 and the inner top of the second annular groove 37. The spring 39 is a compression spring with good elastic recovery performance. In the initial state, it pushes the bottom of the movable sealing ring 38 to fit against the top of the cylinder housing 1. The middle sealing ring 22 has a second groove 35 inside, which is located inside the outer wall of the middle sealing ring 22 and extends through the outer wall of the middle sealing ring 22. A second connecting pipe 36 is provided between the second groove 35 and the second annular groove 37, connecting the second groove 35 and the interior of the second annular groove 37. The second connecting pipe 36 has the same structure as the first connecting pipe 32 to ensure smooth flow of hydraulic oil.

[0035] When the outer wall of the sealing assembly 2 leaks, the hydraulic oil enters the second groove 35 and then enters the second annular groove 37 through the second connecting pipe 36. The pressure of the hydraulic oil presses down on the movable sealing ring 38, causing the movable sealing ring 38 to further press the top of the cylinder housing 1, enhancing the tightness of the sealing surface and ensuring that the hydraulic oil will not leak through the outer wall of the sealing assembly 2.

[0036] The warning component 4 includes a hydraulic sensor 43, which is fixedly mounted on the top of the external sealing ring 23 by bolts. The hydraulic sensor 43 is a high-precision pressure sensor with high detection sensitivity, which can accurately detect minute pressure changes. The detection end of the hydraulic sensor 43 is fixedly mounted with a detection tube 42 by threaded connection. The detection tube 42 is made of stainless steel and is corrosion resistant. An external tube 41 is welded and fixedly mounted to the front end of the detection tube 42. The external tube 41 is connected to the detection tube 42, and the connection is firm and has good sealing performance.

[0037] The external tube 41 is divided into two parts, left and right. Both external tubes 41 are inserted into the external sealing ring 23. The outer external tube 41 is connected to the inside of the second annular groove 37, and the inner external tube 41 is connected to the inside of the first annular groove 33. When hydraulic oil enters the first annular groove 33 or the second annular groove 37, the hydraulic sensor 43 detects the pressure change through the external tube 41 and the detection tube 42, and then issues a warning signal to remind the staff that the sealing component 2 has leaked and to perform maintenance in time.

[0038] Furthermore, all contents not described in detail in this specification are existing technologies known to those skilled in the art, and all electrical components mentioned in this document are powered by external power supply lines.

[0039] Working principle: When installing the hydraulic cylinder sealing assembly 2 with leakage prevention and early warning function, the middle sealing ring 22 is first embedded into the top wall of the cylinder housing 1 and fixed by interference fit. The inner sealing ring 21 and the outer sealing ring 23 are pre-fixed to the middle sealing ring 22 and do not require additional assembly. Then, the hydraulic cylinder is fixed to the external equipment by the movable mounting ring 6 and the fixed mounting ring 7.

[0040] During operation, hydraulic oil enters the cylinder housing 1 through the upper and lower hydraulic oil joints 8, pushing the hydraulic piston 9 to drive the drive rod 5 to reciprocate. The internal sealing ring 21 and the external sealing ring 23 of the sealing assembly 2 achieve initial sealing to prevent hydraulic oil leakage.

[0041] When a slight leak occurs in the inner wall of the sealing assembly 2, hydraulic oil enters the first annular groove 33 through the first groove 31 and the first connecting pipe 32, squeezing the elastic rubber ring 34 to expand and achieve secondary sealing of the inner wall; at the same time, the inner external pipe 41 detects the pressure change in the first annular groove 33, and the hydraulic sensor 43 issues a warning signal.

[0042] When a slight leak occurs on the outer wall of the sealing assembly 2, hydraulic oil enters the second annular groove 37 through the second groove 35 and the second connecting pipe 36, pushing the movable sealing ring 38 to press against the top of the cylinder housing 1, thus achieving a secondary seal on the outer wall; the outer external pipe 41 detects the pressure change in the second annular groove 37, and the hydraulic sensor 43 issues a warning signal.

[0043] Upon receiving the warning signal, staff can promptly stop the machine for inspection and maintenance to prevent the leakage from escalating and ensure the normal operation of the hydraulic cylinder.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder sealing assembly with anti-leakage early warning function, comprising a cylinder housing (1), characterized in that: A hydraulic piston (9) is slidably connected inside the cylinder housing (1). A drive rod (5) is fixedly installed on the top of the hydraulic piston (9). The drive rod (5) passes through the top wall of the cylinder housing (1). A movable mounting ring (6) is fixedly installed on the top of the drive rod (5). A fixed mounting ring (7) is fixedly installed on the bottom of the cylinder housing (1). A sealing assembly (2) is provided on the top of the cylinder housing (1) and outside the drive rod (5). An anti-leakage assembly (3) and an early warning assembly (4) are provided inside the sealing assembly (2). The sealing assembly (2) includes an internal sealing ring (21), a middle sealing ring (22), and an external sealing ring (23). The sealing ring (21) is fixedly installed at the bottom of the middle sealing ring (22), and the outer sealing ring (23) is fixedly installed at the top of the middle sealing ring (22). The drive rod (5) passes through the interior of the inner sealing ring (21), the middle sealing ring (22) and the outer sealing ring (23). The middle sealing ring (22) is fixedly installed inside the top wall of the cylinder housing (1). The inner sealing ring (21) is attached to the inner top wall of the cylinder housing (1). The outer sealing ring (23) is attached to the outer top of the cylinder housing (1). Two hydraulic oil connectors (8) are fixedly installed on the side of the drive rod (5). The upper and lower hydraulic oil connectors (8) are located on the upper and lower sides of the hydraulic piston (9) respectively.

2. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 1, characterized in that: The leak-proof component (3) includes a first groove (31), which is formed on the inner wall of the central sealing ring (22). The inner wall of the first groove (31) penetrates the inner wall of the central sealing ring (22). The outer sealing ring (23) has a first annular groove (33) inside, and the inner wall of the first annular groove (33) penetrates the inner wall of the outer sealing ring (23). A first connecting pipe (32) is formed between the first groove (31) and the first annular groove (33), and the first connecting pipe (32) connects the interior of the first groove (31) and the first annular groove (33).

3. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 2, characterized in that: An elastic rubber ring (34) is fixedly installed on the inner wall of the first annular groove (33). The elastic rubber ring (34) is attached to the outside of the drive rod (5). When the inner wall of the sealing assembly (2) leaks, the hydraulic oil enters the first annular groove (33) through the first groove (31) and the first connecting pipe (32) and squeezes the elastic rubber ring (34) outward to ensure that the hydraulic oil will not leak through the inner wall of the sealing assembly (2).

4. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 1, characterized in that: The outer sealing ring (23) has a second annular groove (37) inside, and a movable sealing ring (38) is slidably connected inside the second annular groove (37). A spring (39) is fixedly installed between the top of the movable sealing ring (38) and the inner top of the second annular groove (37), and the bottom of the movable sealing ring (38) is attached to the top of the cylinder housing (1).

5. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 4, characterized in that: The middle sealing ring (22) has a second groove (35) inside. The second groove (35) is located inside the outer wall of the middle sealing ring (22). The outer side of the second groove (35) penetrates the outer wall of the middle sealing ring (22). A second connecting pipe (36) is provided between the second groove (35) and the second annular groove (37). The second connecting pipe (36) connects the second groove (35) and the interior of the second annular groove (37).

6. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 5, characterized in that: When the outer wall of the sealing assembly (2) leaks, the hydraulic oil enters the second groove (35) and enters the second annular groove (37) through the second connecting pipe (36) and presses down on the moving sealing ring (38). The moving sealing ring (38) presses the top of the cylinder housing (1) to ensure that the hydraulic oil does not leak through the outer wall of the sealing assembly (2).

7. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 1, characterized in that: The warning component (4) includes a hydraulic sensor (43), which is fixedly installed on the top of the external sealing ring (23). A detection tube (42) is fixedly installed at the detection end of the hydraulic sensor (43), and an external tube (41) is fixedly installed at the front end of the detection tube (42). The external tube (41) is connected to the detection tube (42).

8. A hydraulic cylinder sealing assembly with anti-leakage early warning function according to claim 7, characterized in that: The external tube (41) is divided into two parts, left and right. Both external tubes (41) are inserted into the external sealing ring (23). The outer external tube (41) is connected to the inside of the second annular groove (37), and the inner external tube (41) is connected to the inside of the first annular groove (33).

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