High-sealing-performance multi-stage hydraulic oil cylinder

Abstract

The utility model discloses a multi-stage hydraulic oil cylinder with high sealing performance, which relates to the technical field of hydraulic oil cylinders, and comprises a cylinder body, a first piston barrel is arranged above the cylinder body, a second piston barrel is arranged in the first piston barrel, a piston rod is arranged in the second piston barrel, and a piston rod is arranged in the piston rod. The cylinder body, the first piston barrel, the second piston barrel and the piston rod are sequentially connected in an inserted mode, piston heads are arranged at the bottoms of the first piston barrel, the second piston barrel and the piston rod, sealing gaskets are installed on the surfaces of the piston heads, pressing frames are installed at the rear ends of the sealing gaskets, and the pressing frames are elastically connected with the interiors of the piston heads. According to the scheme, the problems that in the prior art, when a multi-stage hydraulic oil cylinder adapts to different working temperature, pressure and medium conditions, hydraulic oil is prone to leakage due to the sealing performance of a sealing ring, the normal working pressure of the oil cylinder cannot be guaranteed, and use of the oil cylinder is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a high-sealing multi-stage hydraulic oil cylinder. Background Art

[0002] A multi-stage hydraulic cylinder is a type of hydraulic cylinder consisting of two or more pistons, usually consisting of a cylinder head, cylinder barrel, sleeve, piston and other parts. Its working principle is to push the piston out through hydraulic pressure, and then use the weight of the piston rod or other external force to reset it.

[0003] For example, the Chinese authorized patent with announcement number CN217481664U (multi-stage hydraulic cylinder) includes a cylinder body, at least one pair of support mechanisms are symmetrically provided on the outer wall of the cylinder body, and the support mechanism includes a fixed sleeve, a slider and a support rod. The fixed sleeve is fixedly provided on the outer wall of the cylinder body, and an internal threaded hole extending along the axis is provided in the fixed sleeve. A through groove communicating with the internal threaded hole is provided on the side of the fixed sleeve away from the cylinder body. One end of the slider is located in the internal threaded hole, and the other end extends to the outside of the fixed sleeve through the through groove; the other end of the slider is movably connected to the upper end of the support rod through a first rotating shaft, and an adjusting screw is adaptively rotated in the fixed sleeve. The adjusting screw presses against the top of one end of the slider. Before the cylinder body moves, the adjusting screw is rotated downward so that the adjusting screw pushes the slider to slide downward. During the downward movement of the slider, the support rod is manually rotated to form a stable triangular structure between the support rod, the cylinder body and the ground, effectively preventing the cylinder body from tipping over during operation. The reasonable structure can improve the operating stability of the cylinder body.

[0004] However, the multi-stage hydraulic cylinder in the above-mentioned prior art is prone to leakage of hydraulic oil due to the sealing of the sealing ring when adapting to different working temperatures, pressures and medium conditions, thereby failing to ensure the normal working pressure of the cylinder and affecting its use; therefore, it does not meet the existing needs. In this regard, we propose a high-sealing multi-stage hydraulic cylinder. Utility Model Content

[0005] The purpose of the present utility model is to provide a high-sealing multi-stage hydraulic cylinder to solve the problem in the prior art proposed in the above background art that the multi-stage hydraulic cylinder is prone to leakage of hydraulic oil due to the sealing of the sealing ring when adapting to different working temperatures, pressures and medium conditions, thereby failing to ensure the normal working pressure of the cylinder and affecting its use.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a highly sealed multi-stage hydraulic cylinder, comprising a cylinder body, a first piston cylinder being provided above the cylinder body, a second piston cylinder being provided inside the first piston cylinder, a piston rod being installed inside the second piston cylinder, the cylinder body, the first piston cylinder, the second piston cylinder and the piston rod being plugged into and connected to each other in sequence, piston heads being provided at the bottoms of the first piston cylinder, the bottoms of the second piston cylinder and the piston rod, sealing gaskets being installed on the surfaces of the piston heads, a pressing frame being installed at the rear end of the sealing gasket, and the pressing frame being elastically connected to the interior of the piston head.

[0007] Preferably, the bottom ends of the cylinder body, the first piston cylinder and the second piston cylinder are all provided with limiting seats, and the limiting grooves are provided inside the limiting seats.

[0008] Preferably, a limiting block is provided at the bottom of the piston head, and the limiting block is plug-connected with the limiting groove inside the limiting seat.

[0009] Preferably, a first connecting plate is provided at the bottom of the cylinder body, and a second connecting plate is provided at the top of the cylinder body.

[0010] Preferably, protective rods are installed at the four corners between the first connecting plate and the second connecting plate, and a connecting port is provided at the top of the second connecting plate.

[0011] Preferably, an oil inlet is provided on one side of the first connecting plate, and an oil return port is provided on one side of the second connecting plate.

[0012] Preferably, the upper surfaces of the first piston cylinder and the second piston cylinder are both provided with sealing covers, the top of the piston rod is provided with a top cover, and the upper surface of the top cover is provided with an ear plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This utility model provides two rings of sealing gaskets on the surface of the piston head, and a holding frame is provided at the rear end of the sealing gaskets. The holding frame is elastically connected to the interior of the piston head. The sealing gaskets are made of fluororubber, which has excellent high-temperature resistance and can generally be used in a temperature range of -20°C to +200°C. It has excellent tolerance to various chemical substances, and when the sealing gaskets are worn, the holding frame will push them outward, thereby automatically compensating. This solves the problem of multi-stage hydraulic cylinders in the prior art that, when adapting to different operating temperatures, pressures and media conditions, they are prone to leakage of hydraulic oil due to the sealing of the sealing rings, thereby failing to maintain the normal operating pressure of the cylinder and affecting its use.

[0015] By arranging sealing covers on the upper surfaces of the cylinder body, the first piston cylinder and the second piston cylinder, and a top cover on the top of the piston rod, the sealing between the joints is ensured. At the same time, limit seats and limit grooves are arranged inside the cylinder body, the first piston cylinder and the second piston cylinder, and a limit block is arranged at the bottom of the piston head. When returning to the position, the two are plugged in and connected to ensure the stability of the extension and retraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the multi-stage hydraulic cylinder of the utility model;

[0017] Figure 2 This is an enlarged schematic diagram of the local structure of the multi-stage hydraulic cylinder of the utility model;

[0018] Figure 3 This is an enlarged schematic diagram of the internal side cross-section of a multi-stage hydraulic cylinder of the present invention;

[0019] Figure 4 This is an enlarged schematic diagram of the internal cross-section A of the multi-stage hydraulic cylinder of the present invention;

[0020] In the figure: 1. Cylinder body; 2. First piston cylinder; 3. Sealing cover; 4. Second piston cylinder; 5. Piston rod; 6. Top cover; 7. Ear plate; 8. First connecting plate; 9. Second connecting plate; 10. Connecting port; 11. Oil inlet; 12. Oil return port; 13. Protective rod; 14. Limit seat; 15. Limit groove; 16. Limit block; 17. Piston head; 18. Sealing gasket; 19. Pressing frame. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-4, the utility model provides an embodiment: a high-sealing multi-stage hydraulic cylinder, including a cylinder body 1, a first piston cylinder 2 is arranged above the cylinder body 1, a second piston cylinder 4 is arranged inside the first piston cylinder 2, a piston rod 5 is installed inside the second piston cylinder 4, the cylinder body 1, the first piston cylinder 2, the second piston cylinder 4 and the piston rod 5 are plugged into each other in sequence, the first piston cylinder 2, the second piston cylinder 4 and the piston rod 5 are all provided with a piston head 17 at the bottom, and a sealing gasket 18 is installed on the surface of the piston head 17. A pressing frame 19 is installed at the rear end of the sealing gasket 18, and the pressing frame 19 is elastically connected to the inside of the piston head 17. When in use, two circles of sealing gaskets 18 are arranged on the surface of the piston head 17, a pressing frame 19 is arranged at the rear end of the sealing gasket 18, and the pressing frame 19 is elastically connected to the inside of the piston head 17. The material of the sealing gasket 18 is fluororubber, which has excellent high temperature resistance and can usually be used It can be used in the temperature range of -20℃ to +200℃, and has excellent tolerance to various chemical substances. When the sealing gasket 18 is worn, the pressing frame 19 will push it outward, thereby playing a role of automatic compensation, solving the problem that the multi-stage hydraulic cylinder in the prior art is easily leaked due to the sealing of the sealing ring when adapting to different working temperatures, pressures and medium conditions, thereby failing to ensure the normal working pressure of the cylinder and affecting its use. In addition, a sealing cover 3 is provided on the upper surface of the cylinder body 1, the first piston cylinder 2 and the second piston cylinder 4, and a top cover 6 is provided on the top of the piston rod 5 to ensure the sealing between the joints. At the same time, a limit seat 14 and a limit groove 15 are provided inside the cylinder body 1, the first piston cylinder 2 and the second piston cylinder 4, and a limit block 16 is provided at the bottom of the piston head 17. When returning to the position, the two are connected by plugging to ensure the stability of the extension and retraction.

[0023] See also Figure 1-Figure 4 The bottom ends of the cylinder body 1, the first piston cylinder 2 and the second piston cylinder 4 are all provided with a limiting seat 14, and a limiting groove 15 is provided inside the limiting seat 14.

[0024] See also Figure 1-Figure 4 A limiting block 16 is provided at the bottom of the piston head 17 , and the limiting block 16 is plugged into the limiting groove 15 inside the limiting seat 14 .

[0025] See also Figure 1-Figure 4 A first connecting plate 8 is provided at the bottom of the cylinder body 1, a second connecting plate 9 is provided at the top of the cylinder body 1, protective rods 13 are installed at the four corners between the first connecting plate 8 and the second connecting plate 9, and a connecting port 10 is provided at the top of the second connecting plate 9.

[0026] See also Figure 1-Figure 4 An oil inlet 11 is provided on one side of the first connecting plate 8 , and an oil return port 12 is provided on one side of the second connecting plate 9 .

[0027] See also Figure 1-Figure 4The upper surfaces of the first piston cylinder 2 and the second piston cylinder 4 are both provided with sealing covers 3, the top of the piston rod 5 is provided with a top cover 6, and the upper surface of the top cover 6 is provided with an ear plate 7 to ensure the sealing between the connections.

[0028] Working principle: When in use, two circles of sealing gaskets 18 are set on the surface of the piston head 17, and a pressing frame 19 is set at the rear end of the sealing gasket 18. The pressing frame 19 is elastically connected to the inside of the piston head 17. The sealing gasket 18 is made of fluororubber, which has excellent high temperature resistance and can usually be used in the temperature range of -20℃ to +200℃. It has excellent tolerance to various chemicals, and when the sealing gasket 18 is worn, the pressing frame 19 will push it outward, thereby playing a role of automatic compensation, solving the problem of multi-stage hydraulic cylinders in the prior art in adapting to different working temperatures. Due to the temperature, pressure and medium conditions, it is easy for the sealing ring to cause leakage of hydraulic oil, thereby failing to ensure the normal working pressure of the oil cylinder and affecting its use. In addition, a sealing cover 3 is provided on the upper surface of the cylinder body 1, the first piston cylinder 2 and the second piston cylinder 4, and a top cover 6 is provided on the top of the piston rod 5 to ensure the sealing between the joints. At the same time, a limiting seat 14 and a limiting groove 15 are provided inside the cylinder body 1, the first piston cylinder 2 and the second piston cylinder 4, and a limiting block 16 is provided at the bottom of the piston head 17. The two are connected by plugging when returning to the position to ensure the stability of the extension and retraction.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A high-sealing multi-stage hydraulic cylinder, comprising a cylinder body (1), characterized in that: A first piston cylinder (2) is provided above the cylinder body (1), a second piston cylinder (4) is provided inside the first piston cylinder (2), a piston rod (5) is installed inside the second piston cylinder (4), the cylinder body (1), the first piston cylinder (2), the second piston cylinder (4) and the piston rod (5) are plug-connected to each other in sequence, a piston head (17) is provided at the bottom of the first piston cylinder (2), the second piston cylinder (4) and the piston rod (5), a sealing gasket (18) is installed on the surface of the piston head (17), a pressing frame (19) is installed at the rear end of the sealing gasket (18), and the pressing frame (19) is elastically connected to the inside of the piston head (17).

2. A high-sealing multi-stage hydraulic cylinder according to claim 1, characterized in that: A limiting seat (14) is provided at the bottom end of the cylinder body (1), the first piston cylinder (2) and the second piston cylinder (4), and a limiting groove (15) is provided inside the limiting seat (14).

3. The high-sealing multi-stage hydraulic cylinder according to claim 2, characterized in that: A limiting block (16) is provided at the bottom of each piston head (17), and the limiting block (16) is plug-connected to the limiting groove (15) inside the limiting seat (14).

4. The high-sealing multi-stage hydraulic cylinder according to claim 3, characterized in that: A first connecting plate (8) is provided at the bottom of the cylinder body (1), and a second connecting plate (9) is provided at the top of the cylinder body (1).

5. The high-sealing multi-stage hydraulic cylinder according to claim 4, characterized in that: Protective rods (13) are installed at the four corners between the first connecting plate (8) and the second connecting plate (9), and a connecting port (10) is provided at the top of the second connecting plate (9).

6. The high-sealing multi-stage hydraulic cylinder according to claim 5, characterized in that: An oil inlet (11) is provided on one side of the first connecting plate (8), and an oil return port (12) is provided on one side of the second connecting plate (9).

7. The high-sealing multi-stage hydraulic cylinder according to claim 6, characterized in that: The upper surfaces of the first piston cylinder (2) and the second piston cylinder (4) are both provided with sealing covers (3), the top of the piston rod (5) is provided with a top cover (6), and the upper surface of the top cover (6) is provided with an ear plate (7).

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