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CN-224214481-U - Sealing device for hydraulic cylinder

CN224214481UCN 224214481 UCN224214481 UCN 224214481UCN-224214481-U

Abstract

The utility model provides a sealing device for a hydraulic cylinder, which comprises a cylinder body, a piston rod and a cylinder cover, wherein the lower end of the piston rod is arranged in a plug-in piston base, an H-shaped piston sleeve is sleeved outside the piston rod, a sealing plate is arranged below the H-shaped piston sleeve, a buffer mechanism is arranged at the lower end of the interior of the cylinder body, the buffer mechanism comprises a sleeve, a movable column, a buffer plate and a spring, the spring is sleeved on the outer side of the movable column, one end of the spring is fixedly connected with the buffer plate, the other end of the spring is fixedly connected with the sleeve, the sleeve is fixedly arranged at the bottom of the cylinder body, the upper end of the movable column is fixedly connected with the buffer plate, and a buffer rubber layer is arranged on the upper surface of the buffer plate. The utility model can construct a double dynamic sealing system, obviously reduce the leakage risk of hydraulic oil, and effectively absorb the impact energy of the piston rod and reduce vibration and noise by utilizing the variable stiffness spring and the honeycomb damping buffer rubber layer.

Inventors

  • FAN ZHIQIANG
  • GAO GANG
  • HAN XIAOLI

Assignees

  • 沈阳华卓控制技术有限公司

Dates

Publication Date
20260508
Application Date
20250605

Claims (9)

  1. 1. The utility model provides a sealing device for pneumatic cylinder, includes cylinder body (1), piston rod (2) and cylinder cap (3), cylinder body (1) top is equipped with threaded connection portion (101), cylinder cap (3) be equipped with the internal thread of threaded connection portion (101) adaptation, piston rod (2) pass cylinder cap (3) stretch into inside cylinder body (1), its characterized in that, be equipped with grafting piston base (5) in cylinder body (1), the lower extreme of piston rod (2) is installed in grafting piston base (5), the outside cover of piston rod (2) is equipped with H type piston sleeve (10), the below of H type piston sleeve (10) is provided with closing plate (11), the inside lower extreme of cylinder body (1) is provided with buffer gear, buffer gear includes sleeve (6), movable column (7), buffer plate (8) and spring (9), spring (9) cup joint are in the outside of movable column (7), spring (9) one end with buffer plate (8) fixed connection, spring (9) are equipped with in the outside of fixed connection of sleeve (6) with cylinder body (7) bottom (7), the upper surface of the buffer plate (8) is provided with a buffer rubber layer (801).
  2. 2. The sealing device for the hydraulic cylinder according to claim 1, wherein the H-shaped piston sleeve (10) is integrally formed by adopting a high-elasticity polyurethane material, the waist of the H-shaped piston sleeve (10) is of an inward concave arc structure, the inner wall of the H-shaped piston sleeve (10) is in interference fit with the piston rod (2), and the outer wall of the H-shaped piston sleeve (10) and the inner wall of the cylinder body (1) form line contact sealing.
  3. 3. A sealing arrangement for a hydraulic cylinder according to claim 2, characterized in that the piston rod (2) is fixedly provided with a stopper (12), and that the stopper (12) is located outside the cylinder head (3).
  4. 4. A sealing arrangement for a hydraulic cylinder according to claim 3, characterized in that a sealing gasket (4) is arranged between the cylinder head (3) and the cylinder block (1).
  5. 5. A sealing arrangement for a hydraulic cylinder according to claim 4, characterized in that the sealing plate (11) is of a composite design of an elastic metal skeleton and polytetrafluoroethylene.
  6. 6. A sealing arrangement for a hydraulic cylinder according to claim 5, characterized in that the surface of the cushion rubber layer (801) is provided with a honeycomb groove, the interior of which is filled with damping material.
  7. 7. A sealing arrangement for a hydraulic cylinder according to claim 6, characterized in that the spring (9) is of a variable stiffness helical construction.
  8. 8. The sealing device for the hydraulic cylinder according to claim 7, wherein a first connecting ring plate (102) is fixedly arranged on the outer side of the cylinder body (1), a second connecting ring plate (301) is fixedly arranged on the lower end of the outer side of the cylinder cover (3), and the first connecting ring plate (102) and the second connecting ring plate (301) are fixedly connected through bolts (13).
  9. 9. A sealing arrangement for a hydraulic cylinder according to claim 8, characterized in that the surface of the bolt (13) is subjected to a dyclon coating.

Description

Sealing device for hydraulic cylinder Technical Field The utility model relates to the technical field of hydraulic cylinders, in particular to a sealing device for a hydraulic cylinder. Background The hydraulic press is used as important pressure processing equipment and is widely applied to various industrial fields such as automobile manufacturing, aerospace, hardware processing and the like. In various processing technologies, such as sheet stamping, stretch forming and the like, a hydraulic cushion ejection mechanism plays a key role and is responsible for stably ejecting a processed workpiece from a die. The prior art discloses a hydraulic cylinder sealing device with the application number 202021590434.9, which comprises a cylinder body, a piston rod movably arranged in the cylinder body and a piston arranged on the piston rod, wherein a first sealing component suitable for sealing the interior of the cylinder body is arranged on the piston, and a second sealing component suitable for sealing the exterior of the cylinder body is arranged at the joint of the cylinder body and the piston rod. The hydraulic cylinder sealing device adopts the first sealing component and the second sealing component to seal the inside and the outside of the hydraulic cylinder respectively, so that the internal leakage and the external leakage of the hydraulic cylinder are reduced, the using effect is improved, and the service life is prolonged. However, the prior art is lack of an effective buffer mechanism, a piston rod is easy to impact the bottom of a cylinder body or a piston due to inertia at the tail end of a stroke, so that a sealing element is deformed and falls off, the service life of the device is shortened, severe vibration and noise are generated, the working environment is influenced, meanwhile, a traditional sealing assembly is mostly made of a single material or structure, such as a common rubber sealing ring, and is easy to wear and age under the working conditions of high-pressure and high-frequency reciprocating motion, so that the internal leakage or the external leakage of hydraulic oil is caused, the operation efficiency and the processing precision of equipment are influenced, and even potential safety hazards are caused. To this end we propose a sealing device for a hydraulic cylinder to solve the above problems. Disclosure of utility model Aiming at the defects existing in the problems, the utility model provides the sealing device for the hydraulic cylinder, which can be used for constructing a dual dynamic sealing system through the line contact sealing of the H-shaped piston sleeve and the sealing plate made of composite materials, remarkably reducing the leakage risk of hydraulic oil, and effectively absorbing the impact energy of the piston rod and reducing vibration and noise by utilizing the variable stiffness spring and the honeycomb damping buffer rubber layer. In order to solve the problems, the technical scheme provided by the utility model is as follows: The utility model provides a sealing device for pneumatic cylinder, includes cylinder body, piston rod and cylinder cap, the cylinder body top is equipped with threaded connection portion, and the cylinder cap is equipped with the internal thread with threaded connection portion adaptation, the piston rod passes the cylinder cap stretches into inside the cylinder body, be equipped with grafting piston base in the cylinder body, the lower extreme of piston rod is installed in the grafting piston base, the outside cover of piston rod is equipped with H type piston sleeve, the below of H type piston sleeve is provided with the closing plate, the inside lower extreme of cylinder body is provided with buffer gear, buffer gear includes sleeve, movable column, buffer plate and spring, the spring cup joints the outside of movable column, the one end of spring with buffer plate fixed connection, the other end of spring with sleeve fixed connection, sleeve fixed mounting is in the bottom of cylinder body, the upper end of movable column with buffer plate fixed connection, the upper surface of buffer plate is provided with the buffer rubber layer. Further, the H-shaped piston sleeve is integrally formed by adopting a high-elasticity polyurethane material, the waist of the H-shaped piston sleeve is of an inward concave arc structure, the inner wall of the H-shaped piston sleeve is in interference fit with the piston rod, and the outer wall of the H-shaped piston sleeve and the inner wall of the cylinder body form line contact sealing. Further, a limiting block is fixedly arranged on the piston rod and located on the outer side of the cylinder cover. Further, a sealing gasket is arranged between the cylinder cover and the cylinder body. Furthermore, the sealing plate adopts a composite design of an elastic metal framework and polytetrafluoroethylene. Further, a honeycomb groove is formed in the surface of the buffer rubber layer, and damping materi