Oil-gas two-medium damping hydraulic cylinder

Abstract

The invention discloses an oil-gas two-medium damping hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. The cylinder comprises a cylinder body, a piston rod and a piston disposed at the right end of the piston rod. An inner cavity is formed in the piston rod, a floating piston capable of sliding along the inner cavity is arranged in the inner cavity, a seal is disposed between the floating piston and the inner wall of the inner cavity, the outer end of the piston rod is provided with an air inlet communicated with an inner cavity in the left side of the floating piston, and the piston or the right end of the piston rod is provided with an oil channel communicating a rodless cavity of the hydraulic cylinder and an inner cavity in the right side of the floating piston. The cylinder is simple in external structure, the outside size of the hydraulic cylinder is not increased, and installation is facilitated; impact energy of compression of inert gas is absorbed, the cylinder is safe and reliable to use, and the service life of the hydraulic cylinder can be prolonged; by adjusting pressure of the injected inert gas, the hydraulic cylinder is suitable for different work conditions, and product quality is stable.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to an oil-air dual-media damping hydraulic cylinder. Background technique [0002] During the movement of the mechanism, due to the impact load or inertial force, when the hydraulic cylinder piston moves to the end of the stroke, it will mechanically collide with the bottom of the cylinder, resulting in great impact and noise. This causes the vibration of the whole machine, causes damage to the oil cylinder and some parts of the main engine, and affects other components in the hydraulic system. [0003] At present, most domestic hydraulic cylinders use spring devices to achieve shock absorption. like figure 1 As shown, the structure is a spring-type hydraulic cylinder with shock absorption function, which mainly includes 3 parts: spring seat, spring and hydraulic cylinder body. The spring is connected to the main body of the hydraulic cylinder through the spring seat,...

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Problems solved by technology

However, due to defects such as spring fatigue failure, the shock absorption effect is not good.

[0004] In the above scheme, since the spring needs to be fixed on the oil cylinder with a spring seat, the external shape of the entire oil cylinder is more complicated, resulting in the reduction of the external space connecting the oil cylinder and the main engine, which is not conducive to the installation of the oil cylinder and the distribution of the structural parts of the main engine; Fatigue failure is prone to occur after repeated compression, and this failure is unpredictable, resulting in fluctuations in the quality of the cylinder; due to the limited domestic spring manufacturing level, it is difficult to maintain consistent performance of each spring, resulting in uneven quality of the entire cylinder

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