A floating piston buffer oil cylinder

Abstract

The present invention relates to a floating piston buffer oil cylinder, which mainly consists of a moving body, a floating piston assembly and a cylinder block (300); the moving body mainly consists of a moving body cylinder block (100) and a piston end cover (110); the floating piston assembly is arranged inside the moving body cylinder block; the right end of the moving body cylinder block (100) is assembled with the piston end cover (110) with a throttle valve (111), and the inside of the moving body cylinder block (100) has an equal-diameter cylindrical cavity, which is divided into three chambers by the floating piston assembly from left to right, namely an air chamber (001), a piston compensation chamber (002) and an adjustment small chamber (003); the right part of the moving body (100) is connected to the cylinder block (300); the outer diameter of the moving body (100) is matched with the inner diameter of the cylinder block (300). The present invention can improve the airtightness of the gas in the buffer oil cylinder; the hydraulic oil in the compensation chamber can improve the lubricity of the floating piston assembly, reduce the wear of the piston body slider sealing ring and the piston body sealing ring, and improve the service life of the floating piston assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of oil cylinders, and in particular relates to a floating piston buffer oil cylinder. Background Art

[0002] Traditional oil cylinders rely on pistons to achieve gas sealing. There are air chambers and oil chambers on both sides of the piston. Usually, through structural design, when the oil cylinder is in a stable working state, the pressure of the oil in the oil chamber is greater than the pressure of the gas in the air chamber, and the gas in the air chamber can be reliably sealed.

[0003] However, when the oil chamber is in a non-working state for a long time, the hydraulic oil in the oil chamber flows back under the action of gravity, etc., gas appears in the oil chamber, the pressure decreases, and the gas sealing of the gas chamber decreases, which may cause air leakage in the gas chamber. Summary of the invention

[0004] The present invention provides a floating piston buffer oil cylinder, and aims to solve the technical problem of maintaining high sealing performance even when all hydraulic oil flows back.

[0005] In order to solve the above technical problems, the present invention provides a floating piston buffer cylinder, which is characterized in that: it is mainly composed of a moving body, a floating piston assembly and a cylinder body 300; the moving body is mainly composed of a moving body cylinder body 100 and a piston end cover 110; the floating piston assembly is arranged in the moving body cylinder body; the right end of the moving body cylinder body 100 is assembled with the piston end cover 110 with a throttle valve 111, and the moving body cylinder body 100 has an equal-diameter cylindrical cavity inside, which is divided into three chambers from left to right by the floating piston assembly, namely, an air cavity 001, a piston compensation cavity 002 and an adjustment small cavity 003; the right part of the moving body 100 is connected to the cylinder body 300; the outer diameter of the moving body 100 matches the inner diameter of the cylinder body 300.

[0006] Beneficial effects: (1) The present invention can improve the sealing of the gas in the buffer cylinder; (2) The hydraulic oil in the compensation chamber 002 can improve the lubricity of the floating piston assembly, reduce the wear of the piston body slider seal 204 and the piston body seal 202, and increase the life of the floating piston assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Structural schematic diagram of the present invention

[0008] Figure 2 Schematic diagram of the working process of the present invention. DETAILED DESCRIPTION

[0009] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below.

[0010] The present invention provides a floating piston buffer oil cylinder, which is mainly composed of a moving body, a floating piston assembly and a cylinder body 300; the moving body is mainly composed of a moving body cylinder body 100 and a piston end cover 110;

[0011] The floating piston assembly is arranged in the moving body cylinder; the floating piston assembly is composed of a floating piston body 200, a piston body pressure ring 203, a piston body sealing ring 202, a piston body slider 201, a piston body slider sealing ring 204, a piston body elastic element 205, a piston body end cover 206 and a one-way valve 208; the floating piston body 200 is composed of two coaxial cylinders, wherein the right end where the large cylinder and the small cylinder are connected has a step, a piston body sealing ring 202 is arranged on the step, and a piston body pressure ring is arranged on the right side of the sealing ring Ring 203, after assembly, the inner diameter of the piston body sealing ring 202 is reduced and the outer diameter is increased under the pressure of the floating piston body 200 step and the piston body pressure ring 203, thereby improving the sealing performance; the small cylinder has a T-shaped hole 207, and the small cylinder is provided with a piston body end cover 206, a piston body elastic element 205 and a piston body slider 201 connected in sequence, the piston body end cover is located at the right end of the small cylinder, one end of the T-shaped hole 207 is connected to the one-way valve 208 located at the right end of the small cylinder, and the other end leads to the right surface of the large cylinder.

[0012] The left end of the moving body cylinder 100 has a connecting structure 101 for connecting with an external moving mechanism, and the right end is assembled with a piston end cover 110 with a throttle valve 111. The moving body cylinder 100 has an equal-diameter cylindrical cavity inside, which is divided into three chambers from left to right by the floating piston assembly, namely, an air cavity 001, a piston compensation cavity 002 and a small adjustment cavity 003;

[0013] The space between the right end face of the piston body slider 201 and the piston end cover 110 is the small adjustment chamber 003, and the space between the left end face of the piston body slider 201 and the right end face of the large cylinder is the piston compensation chamber 002; the left end face of the large cylinder is connected to the air chamber 001; the air chamber 001 is connected to the moving body air injection nozzle 102 through the air injection channel 103. The moving body air injection nozzle 102 is connected to the air injection valve. The throttle valve 111 is used to control the flow rate of the hydraulic oil flowing into the small chamber 003.

[0014] The right part of the moving body 100 is connected to the cylinder body 300;

[0015] The outer diameter of the moving body 100 matches the inner diameter of the cylinder body 300, and the sealing between the two is achieved by the sealing rings 301 and 104;

[0016] Among them, the outer surface of the right end of the moving body 100 is sealed and connected to the inner wall of the cylinder body 300 through a sealing ring 104, dividing the cylinder body into two left and right cavities; the left end of the left cavity 307 of the cylinder body 300 is provided with a sealing ring 301, a movable retaining ring 302, a pressure-assisting elastic element 303 and a fixed retaining ring 304 in sequence; the fixed retaining ring 304 is fixed to the left end of the inner cavity of the cylinder body 300; a left cavity is formed between the left end of the inner cavity of the cylinder body 300 and the boss at the right end of the moving body 100, and the left cavity 307 is connected with the oil inlet 305 on the left part of the cylinder body 300; the right end of the cylinder body 300 is provided with an oil inlet 306, which is connected with the cavity 004 of the floating piston body through the right cavity.

[0017] After the oil cylinder is assembled, the oil entering through the oil inlet 305 puts the pressure-assisting elastic element 303 into a pressurized state, and squeezes the sealing ring 301 through the movable retaining ring 302 to deform it, and reduce the inner diameter to improve the sealing degree.

[0018] The working process is as follows:

[0019] The air chamber 001 on the left side of the floating piston assembly contains high-pressure gas. When the external system requires the floating piston buffer cylinder to work, the hydraulic oil flows into the floating piston buffer cylinder cavity 004 through the oil inlet 306, so that the buffer cylinder cavity 004 and the regulating small cavity 003 are filled with hydraulic oil. At this time, due to the pressure difference, the hydraulic oil will also enter the piston compensation cavity 002 through the one-way valve 208 and the T-hole 207. There is a pressure difference at both ends of the piston body slider 201, so that the piston body elastic element 205 is compressed. Finally, the system reaches mechanical balance. At this time, the hydraulic oil in the compensation cavity 002 has a higher pressure than the high-pressure gas in the air chamber 001, so it has excellent sealing performance. At this time, if the hydraulic oil in the floating piston buffer cylinder cavity 004 flows back, due to the action of the one-way valve 208, there is still hydraulic oil in the piston compensation cavity 002, and the piston body elastic element 205 is still in a compressed state. The pressure relationship on both sides of the piston assembly remains unchanged, that is, the hydraulic oil in the compensation chamber 002 has a higher pressure than the high-pressure gas in the air chamber 001, and still has excellent sealing performance.

[0020] In addition, the hydraulic oil in the compensation cavity 002 also has a lubricating effect, which can effectively extend the service life of the piston body slider seal ring 204 and the piston body seal ring 202.

[0021] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A floating piston buffer oil cylinder, characterized in that: it mainly consists of a moving body, a floating piston assembly and a cylinder block (300); the moving body mainly consists of a moving body cylinder block (100) and a piston end cover (110); the floating piston assembly is arranged inside the moving body cylinder block; the right end of the moving body cylinder block (100) is assembled with the piston end cover (110) with a throttle valve (111), and the inside of the moving body cylinder block (100) has an equal-diameter cylindrical cavity, which is divided into three chambers by the floating piston assembly from left to right, namely an air chamber (001), a piston compensation chamber (002) and an adjustment small chamber (003); the right part of the moving body (100) is connected to the cylinder block (300); the outer diameter of the moving body (100) is matched with the inner diameter of the cylinder block (300); the floating piston assembly mainly consists of a floating piston body (200), a piston body pressing ring (203), a piston body sealing ring (202), a piston body slider (201), a piston body slider sealing ring (204), a piston body elastic element (205), a piston body end cover (206) and a one-way valve (208); the floating piston body (200) consists of two coaxial cylinders, the right end where the large cylinder is connected to the small cylinder has a step, a piston body sealing ring (202) is arranged on the step, a piston body pressing ring (203) is arranged on the right side of the sealing ring, the small cylinder has a T-shaped hole (207), and a piston body end cover (206), a piston body elastic element (205) and a piston body slider (201) are sequentially connected on the small cylinder, the piston body end cover is located at the right end of the small cylinder, one end of the T-shaped hole (207) is connected to the one-way valve (208) located at the right end of the small cylinder, and the other end leads to the right surface of the large cylinder; the outer surface of the right end of the moving body (100) is hermetically connected to the inner wall of the cylinder block (300), dividing the cylinder block into two cavities on the left and right; a left cavity is formed between the left end of the inner cavity of the cylinder block (300) and the right end boss of the moving body (100); a sealing ring (301), a movable retaining ring (302), an auxiliary pressure elastic element (303) and a fixed retaining ring (304) are sequentially arranged at the left end of the left cavity of the cylinder block (300); an oil inlet (306) is arranged at the right end of the cylinder block (300), which is communicated with the cavity (004) of the floating piston body through the right cavity; the left cavity is communicated with the oil inlet (305) at the left part of the cylinder block (300).

2. A floating piston buffer oil cylinder according to claim 1, characterized in that: the air chamber (001) on the left side of the floating piston assembly is filled with high-pressure gas.

3. A floating piston buffer oil cylinder according to claim 1, characterized in that: the left end of the moving body cylinder block (100) has a connection structure (101) for connecting to an external moving mechanism.

4. A floating piston buffer oil cylinder according to claim 1, characterized in that: the air chamber (001) is connected to the moving body air injection nozzle (102) through an air injection channel (103).

5. A floating piston buffer oil cylinder according to claim 4, characterized in that: the moving body air injection nozzle (102) is connected to an air injection valve.

Images