Novel spiral swing oil cylinder sealing structure

Abstract

The utility model provides a novel spiral swing oil cylinder sealing structure which comprises a piston, a piston sleeve, a cylinder body and a cylinder cover, the piston sleeve is provided with a T-shaped sealing piece and a piston sleeve guide ring, and the piston sleeve guide ring is arranged close to the piston; the cylinder cover is provided with a cylinder cover guide ring and a U-shaped combined seal, the cylinder cover guide ring is arranged close to the cylinder body, the U-shaped combined seal is arranged close to the cylinder body, the U-shaped combined seal comprises a U-shaped ring and a star-shaped rubber ring, and the U-shaped ring is matched with the star-shaped rubber ring; by adopting the arc-shaped T-shaped sealing piece and the U-shaped combined seal, the arc-shaped sliding contact surface reduces the motion friction force of the sealing piece, the sealing performance is better, the star-shaped rubber ring is embedded in the polyurethane U-shaped ring in the U-shaped combined seal, preloading on the lip part is provided, leakage of the oil cylinder at low pressure or low temperature is prevented, and reliable sealing is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing structure field, concretely relates to a novel spiral swing oil cylinder sealing structure. BACKGROUND

[0002] The spiral swing oil cylinder is converted into the swing movement form of the output shaft through the oblique spiral engagement form of the piston linear motion, and the significant feature is that it has very high efficiency, and can use hydraulic pressure in very small space and has very high torque. The spiral swing oil cylinder is applied in many fields requiring limited rotation and large torque, such as the swing of the working frame of the aerial work platform vehicle, the swing positioning of the drilling arm of the mine equipment, the steering of the tire or track of the agricultural equipment and the highway equipment, the swing of the executing mechanism of the sweeper and the fork truck, and the overturning of the garbage can of the garbage truck. Now the spiral swing oil cylinder is more and more applied to the structure with limited installation space, to realize the swing of the executing mechanism.

[0003] The spiral swing oil cylinder bears certain pressure when working, and the heavier the load is, the greater the pressure will be. Some spiral swing oil cylinders appear abnormal conditions such as oil leakage or weak swing after being used for a period of time, and the failure reasons are that the high load leads to the damage of the sealing ring due to high friction, the sealing structure is damaged or the material is aged due to high working temperature, and the leakage appears under low pressure or low temperature. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a novel spiral swing oil cylinder sealing structure, and the arc sliding contact surface reduces the movement friction of the sealing element, the sealing property is better, the star-shaped rubber ring is embedded in the polyurethane U-shaped ring in the U-shaped combined sealing, the preloading of the lip is provided, the leakage of the oil cylinder under low pressure or low temperature is prevented, and reliable sealing is realized.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme.

[0006] A novel spiral swing oil cylinder sealing structure, including piston, piston cover, cylinder and cylinder cover, the piston cover is provided with T type sealing element and piston cover guide ring, the piston cover guide ring is close to the piston setting, the cylinder cover is provided with cylinder cover guide ring and U type combined sealing, the cylinder cover guide ring is close to the cylinder setting, the U type combined sealing is close to the cylinder setting, the U type combined sealing includes U type ring and star type rubber ring, the U type ring and the star type rubber ring cooperate.

[0007] Further, the T type sealing element includes cylinder T type sealing element and piston T type sealing element, the cylinder T type sealing element is close to the cylinder setting, and the piston T type sealing element is close to the piston setting.

[0008] Further, the T-shaped sealing piece is made of nitrile rubber.

[0009] Further, the U-shaped ring is made of polyurethane.

[0010] Further, the guide ring is made of glass fiber modified reinforced nylon.

[0011] Further, the T-shaped sealing piece is further provided with a check ring.

[0012] Further, the check ring is made of polyformaldehyde.

[0013] Further, one side of the T-shaped sealing piece is arc-shaped.

[0014] The positive effect of the novel spiral swing oil cylinder sealing structure is:

[0015] (1) The T-shaped sealing piece of the utility model adopts special section design, and the arc-shaped sliding contact surface reduces the movement friction of the sealing piece, and the sealing performance is better.

[0016] (2) The guide ring of the utility model is made of glass fiber modified reinforced nylon material, and the dynamic compressive strength is high, and the temperature resistance, wear resistance, characteristics are good, and the guide support is strong.

[0017] (3) The polyurethane U-shaped ring in the U-shaped combined sealing of the utility model inserts a star-shaped rubber ring, provides preloading to the lip, prevents the oil cylinder from leaking at low pressure or low temperature, and realizes reliable sealing. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram provided by the utility model embodiment.

[0019] The numbers in the drawing are respectively:

[0020] 1, piston; 2, piston sleeve; 3, cylinder body; 4, cylinder cover; 5, piston sleeve guide ring; 6, cylinder cover guide ring; 7, U-shaped combined sealing; 8, cylinder body T-shaped sealing piece; 9, piston T-shaped sealing piece. DETAILED DESCRIPTION

[0021] The following detailed description of the novel spiral swing oil cylinder sealing structure is given with reference to the accompanying drawings, but it should be pointed out that the detailed description is not used to limit the specific implementation of the utility model. Any similar structure and similar changes thereof using the utility model should be included in the protection scope of the utility model. The following embodiment description is referenced to the additional drawings to illustrate the specific embodiments of the utility model which can be used to implement the utility model. The directions mentioned in the embodiment, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc. are only referenced to the directions of the additional drawings. Therefore, the directions used are used to explain and understand the utility model, but not to limit the utility model.

[0022] Referring to Figure 1 A novel spiral swing oil cylinder sealing structure comprises a piston 1, a piston sleeve 2, a cylinder body 3 and a cylinder cover 4, the piston sleeve 2 is provided with a T-shaped sealing element and a piston sleeve guide ring 5, the piston sleeve guide ring 5 is arranged close to the piston 1, the cylinder cover 4 is provided with a cylinder cover guide ring 6 and a U-shaped combined sealing 7, the cylinder cover guide ring 6 is arranged close to the cylinder body 3, the U-shaped combined sealing 7 is arranged close to the cylinder body 3, the U-shaped combined sealing 7 comprises a U-shaped ring and a star-shaped rubber ring, and the U-shaped ring and the star-shaped rubber ring are matched.

[0023] The piston 1, the piston sleeve 2, the cylinder body 3 and the cylinder cover 4 are in size cooperation, the piston sleeve 2 is arranged close to the piston 1, the piston sleeve 2 is arranged between the piston 1 and the cylinder body 3, and the cylinder cover 4 is arranged close to the cylinder body 3.

[0024] The T-shaped sealing element comprises a cylinder body T-shaped sealing element 8 and a piston T-shaped sealing element 9, the cylinder body T-shaped sealing element 8 is arranged close to the cylinder body 3, and the piston T-shaped sealing element 9 is arranged close to the piston 1. One side of the T-shaped sealing element is arc-shaped, that is, in the drawings, the convex surface of the cylinder body T-shaped sealing element 8 facing upwards is arc-shaped, and the convex surface of the piston T-shaped sealing element 9 facing downwards is arc-shaped. The T-shaped sealing element adopts a butyronitrile rubber element with high elasticity and wear resistance.

[0025] The T-shaped sealing element is further provided with a check ring, and the check ring adopts a polyoxymethylene element. The check ring is arranged at the two shoulders of the T-shaped sealing element, and the high-hardness material check rings on the two sides can withstand high pressure, effectively protect the T-shaped sealing element, make the T-shaped sealing element more resistant to extrusion, and avoid the T-shaped sealing element being extruded into the gap of the oil cylinder under high pressure, thereby causing sealing failure.

[0026] The U-shaped ring adopts a wear-resistant and high-elastic polyurethane element, and a star-shaped rubber ring is embedded in the inside, and has very good sealing performance and service life. In the drawings, the opening direction of the U-shaped ring is to the left, and the star-shaped rubber ring is arranged at the left side of the U-shaped ring. The star-shaped rubber ring improves the sealing performance under low pressure and low temperature, compensates for the wear or deformation of the U-shaped ring, and prolongs the sealing life.

[0027] The guide ring is made of glass fiber modified reinforced nylon, which provides guiding support force for the reciprocating and rotating movement of the oil cylinder. The glass fiber modified reinforced nylon has high dynamic compressive strength, good temperature resistance and wear resistance, and strong guiding support for the piston rod. The piston sleeve guide ring 5 is arranged in the inner hole of the piston sleeve 2, and the sizes are matched with each other, that is, the downward part of the piston sleeve 2 in the drawing. The cylinder cover guide ring 6 is arranged on the outer ring groove of the cylinder cover 4, that is, the upward part of the cylinder cover 4 in the drawing.

[0028] In the installation, the T-shaped sealing element is first arranged in the outer ring (i.e., the cylinder body T-shaped sealing element 8) and the groove of the inner hole (i.e., the piston T-shaped sealing element 9) of the piston sleeve 2, and then the two side retaining rings are arranged; then the guide ring is arranged on the piston sleeve 2 and the cylinder cover 4, and the U-shaped combined sealing 7 is arranged on the outer ring of the cylinder cover 4. The guide ring prevents direct contact and friction between the metal matching elements, and plays a supporting and guiding role for the spiral swing oil cylinder during reciprocating and rotating movement. When the oil cylinder is under high load, high pressure occurs, and the polyformaldehyde retaining ring of the T-shaped sealing element protects the elastomer from being squeezed into the gap and damaged. When the U-shaped combined sealing 7 is worn out after long-term work, the star-shaped rubber ring provides compensation and improves the sealing life.

[0029] The T-shaped sealing element of the utility model adopts special cross-section design, and the arc-shaped sliding contact surface reduces the movement friction force of the sealing element and has better sealing performance. The guide ring of the utility model is made of glass fiber modified reinforced nylon material, has high dynamic compressive strength, good temperature resistance and wear resistance, and strong guiding support. The star-shaped rubber ring is embedded in the polyurethane U-shaped ring in the U-shaped combined sealing 7 of the utility model, which provides preloading for the lip part, prevents leakage of the oil cylinder under low pressure or low temperature, and realizes reliable sealing.

Claims

1. A novel seal structure for a helical oscillating cylinder, characterized by, The piston, the piston sleeve, the cylinder body and the cylinder cover are included, the piston sleeve is provided with a T-shaped sealing element and a piston sleeve guide ring, the piston sleeve guide ring is arranged close to the piston, the cylinder cover is provided with a cylinder cover guide ring and a U-shaped combined sealing element, the cylinder cover guide ring is arranged close to the cylinder body, the U-shaped combined sealing element is arranged close to the cylinder body, the U-shaped combined sealing element includes a U-shaped ring and a star-shaped rubber ring, and the U-shaped ring and the star-shaped rubber ring are matched.

2. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein The T-shaped sealing element includes a cylinder body T-shaped sealing element and a piston T-shaped sealing element, the cylinder body T-shaped sealing element is arranged close to the cylinder body, and the piston T-shaped sealing element is arranged close to the piston.

3. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein The T-shaped sealing element is made of butyronitrile rubber.

4. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein The U-shaped ring is made of polyurethane.

5. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein The guide ring is made of glass fiber modified reinforced nylon.

6. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein The T-shaped sealing element is further provided with a check ring.

7. The novel seal structure for the helical oscillating cylinder as claimed in claim 6, wherein The check ring is made of polyformaldehyde.

8. The novel seal structure for the helical oscillating cylinder as claimed in claim 1, wherein One side of the T-shaped sealing element is arc-shaped.

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