CN103244507A - Piston air chamber buffer controlled-release cavity arranged on cylinder piston rod - Google Patents

Abstract

A piston air chamber cushioning and slow-release chamber arranged on the piston rod of an oil cylinder, the structure of which consists of a cylinder body 1, a screw cap 2, an oil cylinder piston 3, a small piston 4, an inflation check valve 5, a piston rod 6 and a one-way valve. The throttle valve 7 is combined; it is characterized in that: a stepped blind hole is set at the left end of the piston rod 6, and the big one is an internal thread hole; the small piston 4 is installed in the small blind hole, and the small piston 4 and the small blind hole are Cooperate and provide a seal so that the small piston 4 and the small blind hole form a closed cavity; fill the closed cavity with inert gas through the inflation check valve 5; the left end of the small piston 4 passes through the screw cap 1 The one-way throttle valve 7 communicates with the rodless chamber of the oil cylinder; it is equivalent to setting an accumulator on the piston rod 6 . During the starting process of the oil cylinder, the excess flow will push the small piston 4 to divert part of the fluid to relieve the starting impact; when the impact pressure decreases, they will gradually flow back to the rodless cavity, saving energy and preventing backflow impact.

Description

A piston air chamber cushioning and slow release chamber arranged on the piston rod of the oil cylinder

1. Technical field:

The invention relates to a piston air chamber cushioning and slow-release accommodation chamber arranged on a piston rod of an oil cylinder.

2. Background technology:

With the development of my country's industry, hydraulic transmission and control have been widely used in various types of heavy machinery and equipment.

The hydraulic cylinder is the most important actuator in the hydraulic transmission system. Its performance plays a big role in the performance of the host.

With the development of hydraulic technology towards high pressure and high speed today, the start-up shock and reversing shock of the hydraulic cylinder have brought a large hydraulic shock to the main engine, causing vibration and noise of the main engine, which can easily lead to early damage to the hydraulic oil pump. . The hydraulic impact causes unnecessary consumption of energy, which makes the hydraulic system of the main engine heat up rapidly, which in turn reduces the viscosity of the working medium of the hydraulic system, and the volumetric efficiency of the system decreases.

This kind of impact is caused by the high-acceleration start and reversing with load, the coordination and cooperation of the various working devices of the main engine, and the reasonable matching of the main control components in the hydraulic system in the transition process of their dynamic response. For these reasons, people have conducted a lot of research and discussion, but these are inherent to the working nature of the mainframe, so that people's efforts to improve or alleviate this impact and energy consumption through more reasonable matching have little effect.

At present, on all kinds of high-end hydraulic equipment, the smooth start-up and energy-saving buffering of hydraulic cylinders are one of the problems that plague the industry.

3. Contents of the invention:

The purpose of the present invention is to develop a new structure for smooth starting and energy-saving buffering of a hydraulic oil cylinder with excellent performance, reliable technology, energy saving and noise reduction.

The present invention is a piston air chamber cushioning and slow-release chamber arranged on the piston rod of an oil cylinder, and its structure consists of a cylinder body 1, a screw cap 2, an oil cylinder piston 3, a small piston 4, an inflation check valve 5, and a piston rod 6 It is combined with one-way throttle valve 7; it is characterized in that: a stepped blind hole is set at the left end of piston rod 6, and the larger one is an internal thread hole; the small piston 4 is installed in the small blind hole, and the shaft of the small piston 4 The position is positioned by the screw cover 1, the small piston 4 is matched with the small blind hole, and a seal is provided, so that the small piston 4 and the small blind hole form a closed cavity; The cavity is filled with inert gas; the pressure of the inert gas is slightly higher than the working pressure of the oil cylinder, and the left end of the small piston 4 communicates with the rodless cavity of the oil cylinder through the one-way throttle valve 7 on the screw cap 1; A piston air chamber accumulator is arranged on the piston rod 6 .

In the start-up process of the oil cylinder, the speed of the oil cylinder increases from static, and the excess flow will inevitably cause the pressure in the rodless chamber of the oil cylinder to rise rapidly. When the pressure is higher than the pressure filled with inert gas, it will push The small piston 4 is further compressed and filled with inert gas, which enters the cavity between the small piston 4 and the screw cap 1, diverts part of the fluid, and relieves the starting impact of the cylinder; When increasing or decreasing, the fluid originally entering the chamber at the left end of the small piston 4 will gradually flow back to the rodless chamber under the action of the compressed inert gas, forcing the pressure oil originally to be overflowed from the overflow valve to do work again, saving energy. And prevent backflow shock.

This structure is especially useful for the long boom working device of the concrete pump truck. During the work, the dynamic load protection of the boom supporting the hydraulic cylinder caused by the elasticity of the boom and the maintenance of the original position of the boom are very useful.

effect.

4. Description of drawings:

Accompanying drawing 1 is a structural principle diagram of the present invention.

5. Specific implementation methods:

The specific implementation method of the present invention is: during the start-up process of the oil cylinder, the speed of the oil cylinder is increased from static, and the excess flow will inevitably cause the pressure in the rodless cavity of the oil cylinder to rise rapidly. When the pressure is higher than that filled with inert gas The pressure will push the small piston 4 to be further compressed and filled with inert gas, and enter the cavity between the small piston 4 and the screw cap 1, diverting part of the fluid and alleviating the starting impact of the cylinder; and when the impact in the rodless cavity of the cylinder When the pressure increases and decreases with the speed of the oil cylinder, the fluid that originally entered the chamber at the left end of the small piston 4 will gradually flow back to the rodless chamber under the action of the compressed inert gas, forcing the pressure oil originally to be overflowed from the overflow valve to re- Work is done, energy is saved, and backflow shocks are prevented.

Claims (1)

1. A piston air chamber cushioning and slow-release chamber arranged on the piston rod of the oil cylinder. It is composed of a directional valve (5), a piston rod (6) and a one-way throttle valve (7); it is characterized in that: a stepped blind hole is set at the left end of the piston rod (6), and the larger one is an internal threaded hole; The small piston (4) is installed in the small blind hole, the axial position of the small piston (4) is positioned by the screw cover (1), the small piston (4) is matched with the small blind hole, and a seal is provided to make the small The piston (4) and the small blind hole form a closed cavity; the closed cavity is filled with inert gas through the inflation check valve (5); the pressure of the inert gas filled is slightly higher than the working pressure of the oil cylinder, and the small piston (4) The left end of the cylinder is communicated with the rodless chamber of the oil cylinder through the one-way throttle valve (7) on the screw cover (1); this is equivalent to setting a piston air chamber accumulator on the piston rod (6); During the start-up process, the speed of the cylinder increases from static, and the excess flow will inevitably cause the pressure in the rodless cavity of the cylinder to rise rapidly. When the pressure is higher than the pressure filled with inert gas, it will push the small piston (4 ) is further compressed and filled with inert gas, which enters the cavity between the small piston (4) and the screw cap (1), diverts part of the fluid, and relieves the starting impact of the cylinder; When the speed increases and decreases, the fluid that originally entered the chamber at the left end of the small piston (4) will gradually flow back to the rodless chamber under the action of the compressed inert gas, forcing the pressure oil originally to be overflowed from the relief valve to do work again. Energy is saved and backflow shocks are prevented.

Images