CN2300751Y - Buffer cylinder series extended range hydraulic oscillation cylinder - Google Patents

Abstract

A special hydraulic oscillating cylinder device is composed of two piston rods moving independently and connected in series with piston group, two cylinders fixed together, and upper main cylinder and lower buffering cylinder. The hydraulic oil source only provides power for the main oil cylinder, and the reversing control signal comes from the buffer cavity of the main oil cylinder. When the upward working stroke of the main oil cylinder reaches the terminal, the inertial kinetic energy of the load can push the piston and the cylinder barrel of the main oil cylinder to move upwards for a small distance delta L, so that the stroke of the buffer oil cylinder is additionally increased, and the downward working conditions of the main piston are the same.

Description

Buffer cylinder series extended range hydraulic oscillation cylinder

The utility model is related to the recovery and utilization of kinetic energy when a hydraulic transmission reciprocating mechanism changes direction.

A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy for linear motion. The working pressure, working flow, output force and output speed of the hydraulic cylinder are the main performance parameters of the hydraulic cylinder. Because the piston rod of the hydraulic cylinder is generally used to drag the load to do work. Therefore, when the piston rod runs to the end of the stroke, the cylinder end cover will prevent the piston rod from continuing to move. At this time, the mass and speed of the load constitute an equivalent load (referring to all moving parts such as the piston and the piston rod and the pushed load. The kinetic energy of the abbreviation of sum of mass) can be measured by (1/2)MVV. This kinetic energy is very unfavorable to the reversing of the system. It will cause hydraulic shock and mechanical vibration in the hydraulic system at the moment of reversing, and directly damage the piston rod and the end cover of the cylinder barrel. worsen working conditions.

In order to overcome the above shortcomings, the general hydraulic system uses a flow control valve to control the working flow, or adds a buffer device at the end of the oil cylinder, and uses the damping hole of the hydraulic buffer to convert the kinetic energy of the equivalent load of the system into the pressure energy of the hydraulic oil in the buffer chamber to slow down. The impact energy is finally converted into heat energy and dissipated into the atmosphere. For a hydraulic transmission system with frequent reversing, the heat energy converted by the kinetic energy of the equivalent load through the buffer device will not be dissipated into the atmosphere immediately, which will cause the oil temperature of the hydraulic oil to rise rapidly, and even make the hydraulic system abnormal. Work.

The purpose of the utility model is to provide a special hydraulic oscillating oil cylinder device connected in series by two oil cylinders. The total stroke is the stroke of the main cylinder plus the stroke of the buffer cylinder, and the oil source only provides power for the main cylinder; the power of the buffer cylinder comes from the kinetic energy of the pushed load. Therefore, the stroke of the buffer cylinder of the hydraulic oscillating cylinder of the present invention has an additional stroke of the buffer cylinder compared with the main cylinder powered by the hydraulic oil source, so it is called an extended-range hydraulic oscillating cylinder. Among them, the oil cylinder with a longer stroke is the main oil cylinder, and its working stroke depends on the specific requirements of the working object. Another cylinder with a shorter stroke is the buffer cylinder, and its stroke depends on the kinetic energy of the work object. The oil inlet and outlet of the buffer oil cylinder are respectively connected to the oil return port of the main oil circuit system or the oil tank and the accumulator.

The utility model is made up of five parts, altogether 15 parts.

1. Oil source part:

The oil source is to convert the rotational mechanical energy of the power machine into the pressure energy of the liquid.

2. Control system part:

The control system is to distribute the hydraulic energy provided by the oil source to the corresponding working chamber of the actuator according to the working needs.

3. Main oil cylinder:

The master cylinder is an actuator that converts hydraulic energy into mechanical energy.

4. Buffer cylinder:

The buffer cylinder is a conversion element that converts the kinetic energy of the moving parts into hydraulic pressure energy during reversing, and it compresses and boosts the hydraulic oil and sends it to the accumulator.

5. Buffer energy control part:

It consists of eleven elements. It mainly completes the storage and controlled release of the buffer energy. It uses the buffer energy as the power source to help the main oil circuit push the load to start and work.

The basic structure and working principle of the buffer cylinder series extended range hydraulic oscillating cylinder are shown in the attached figure:

(1) fuel tank

(2) Constant power variable pump

(3) Servo control valve

(4) Master oil cylinder

(5) Buffer cylinder

(6) Oil replenishment check valve in the upper chamber of the buffer cylinder

(7) Oil supplement check valve in the lower chamber of the buffer cylinder

(8) Oil discharge one-way valve in the upper chamber of the buffer cylinder

(9) Oil discharge check valve in the lower chamber of the buffer cylinder

(10) Accumulator oil discharge check valve

(11) Accumulator

(12) Speed control valve

(13) Three-position three-way hydraulic control reversing valve

(14) Adjustable one-way throttle valve in the lower cavity of the main oil cylinder

(15) Adjustable one-way throttle valve in the upper cavity of the main oil cylinder

(16) Equivalent load

(17) Ball hinge earring set

The whole working process can be divided into five working conditions:

1. Starting energy conversion conditions:

When the servo control valve (3) distributes the high-pressure hydraulic oil from the oil pump (2) to the lower cavity of the main oil cylinder (4), the high-pressure hydraulic oil entering the lower cavity of the main oil cylinder (4) causes the piston of the main oil cylinder (4) to be subjected to a The upward thrust forces the equivalent load (16) to move upward; at the same time, the high-pressure oil also generates a downward thrust on the end cover B of the main oil cylinder (4). Since the piston rod of the buffer cylinder (5) is hinged to the foundation, the buffer The hydraulic oil in the closed cavity between the cylinder piston and the end cover C is pressed out of the C cavity. There are only two passages between chamber C and the outside world, which are respectively equipped with an oil replenishment check valve (6) in the upper chamber of the buffer cylinder and an oil discharge check valve (8) in the upper chamber of the buffer cylinder. Therefore, the hydraulic oil that is pressed out of the C chamber can only enter the accumulator (11) through the check valve (8) to compress the inert gas in the accumulator (11). In the above-mentioned physical process, the displacement (potential energy) of the equivalent load (16) is changed into the pressure energy of the liquid in the C cavity due to the displacement of the buffer oil cylinder (5), and then into the gas elastic potential energy. Under the suction of the negative pressure in the D chamber of the buffer cylinder (5), the hydraulic oil is supplemented into the D chamber through the oil replenishment check valve (7) in the lower chamber of the buffer cylinder, which prepares the conditions for the next buffering.

2. Working condition of energy storage and release:

The hydraulic oil stored in the accumulator (11) has only three passages, two of which have been blocked by the one-way valves (8) and (9) and cannot flow in reverse, so it can only pass through the one-way valve (10) and the regulating valve. The speed valve (12) and the three-position three-way hydraulic control reversing valve (13) enter the main circuit and merge with the hydraulic oil output by the constant power variable pump (2) to provide high-pressure hydraulic oil to the main oil circuit. Since the three-position three-way hydraulic control reversing valve (13) is controlled by the main oil cylinder (4), the pressure oil in chamber B of the main oil cylinder enters the three-position three-way hydraulic control reversing valve ( 13) in the lower control chamber, the hydraulic control reversing valve (13) just works in the working condition of the lower block and the accumulator (11) is communicated with the main oil circuit through the speed regulating valve (12). The hydraulic oil released by the elastic potential energy of the gas enters the main oil circuit, and together with the hydraulic oil in the main oil circuit, pushes the piston of the main oil cylinder (4) to do work. The displacement ΔL lost by the equivalent load (16) during starting is compensated in the upward process of the master oil cylinder because of the energy work done by the accumulator.

3. Terminal buffer braking working conditions:

When the piston runs to the end and touches the end cover, the stroke of the main cylinder (4) has been completed, and the buffer chamber of chamber A outputs the reversing control signal, which is transmitted to the servo control valve (3), and the servo control valve (3) receives Immediately after the reversing control signal from the piston to the terminal, the reversing is responded to, so that the B chamber is communicated with the oil tank (1), the A chamber is communicated with the oil pump (2), and the piston of the main oil cylinder (4) starts to move downward. The load (16) will continue to move upward under the action of inertial force. At this moment, the high-pressure oil has entered the A cavity, and in addition to acting on the piston to generate a downward force, it will also act on the end cover A to generate an upward force. Since the main oil cylinder (4) and the buffer cylinder (5) are fixed together in series, the force is transmitted to the end cover D of the buffer cylinder to compress the hydraulic oil in the chamber D, and the pressurized hydraulic oil passes through the one-way valve (9) Entering the accumulator (11), the inert gas in the compressed accumulator (11) becomes the elastic potential energy of the gas and stores it. The volume of chamber C increases to form a negative pressure, and hydraulic oil is replenished through the oil replenishment check valve (7). As the air pressure in the accumulator (11) rises, the pressure in the buffer cylinder (5) D cavity also increases until a certain balance point is reached, and at this moment the upward velocity of the equivalent load (16) is zero. Under the effect of the main circuit pressure of the A cavity, the piston of the main oil cylinder (4) is forced to move downward. The commutation condition is completed.

4. Working condition of downlink energy release:

Contrary to the second working condition, at this time, chamber A of the main oil cylinder (4) becomes a high-pressure chamber, and the high-pressure oil in chamber A enters the upper port of the three-position three-way hydraulic control directional valve (13) through the adjustable flow valve (15). In the control chamber, the hydraulic control reversing valve (13) just works in the working condition of the upper block, and the accumulator (11) is communicated with the main oil circuit through the speed regulating valve (12). The hydraulic oil released by the gas elastic potential energy in the accumulator (11) just enters the main oil circuit, and promotes the equivalent load (16) to work downward together with the hydraulic oil in the main oil circuit.

5. Downlink terminal buffer braking working conditions:

This working condition is similar to the buffer braking working condition of the uplink terminal. When the piston of the main oil cylinder (4) runs to the terminal, the hydraulic oil in the cavity C of the buffer oil cylinder (5) is pressed into the accumulator (11) by the kicking kinetic energy of the equivalent load (16) to store it, and the main oil cylinder ( 4) When the piston moves upward, under the control of the buffer energy control device, the hydraulic oil entering the main oil circuit and the main oil circuit pushes the equivalent load (16) upward to perform work.

The utility model uses a special buffer oil cylinder to realize the buffer function of the general hydraulic oil cylinder. Therefore, the working function of the main cylinder is separated from the reversing buffer braking function. For the equivalent load, the buffer cylinder series extended range hydraulic oscillation cylinder has two pistons and piston rods. One side is connected to the load, and the other side is fixed. The pistons move separately. The commutation has been completed while the equivalent load continues to decelerate.

A variety of transition processes can be formed by matching the area ratio of different main cylinders to buffer cylinders and the capacity of the accumulator. A variety of options are available for different work organization needs. But one of the basic characteristics is that the effective working area of the main oil cylinder is larger than the effective working area of the corresponding buffer oil cylinder.

In the utility model, a buffer oil cylinder is adopted to replace the buffer cavity in the general oil cylinder. The buffer hydraulic energy is not released through the damping gap or the damping hole; instead, it is fully stored by the accumulator, and is used to work on the anti-phase acceleration motion of the load in the next starting condition. If the conversion efficiency is 90%, Then, when the equivalent load moves at a speed of 1 m/s in the positive direction; after reversing, the equivalent load can obtain a moving speed of 0.9 m/s in the reverse direction, and the designer can choose a smaller power machine to meet the hydraulic pressure requirements. The working requirement of the transmission system to push the load to do work. Therefore, the utility model is an energy-saving hydraulic transmission device.

Claims (6)

1. A buffer cylinder series extended-range hydraulic oscillating cylinder connected in series by two oil cylinders, which is characterized in that: there are two pistons, two piston rods and two cylinder barrels, one of which is connected to the load, and the other piston The rod is fixed to the base, the two oil cylinders are connected in series, and the two pistons can move separately, forming two major parts of the main oil cylinder and the buffer oil cylinder. 2. The buffer cylinder series extended-range hydraulic oscillation cylinder according to claim 1, characterized in that: the rodless chamber end of the main cylinder and the rodless chamber end of the buffer cylinder are connected in series back to back. 3. The buffer cylinder series extended range hydraulic oscillating oil cylinder according to claim 1, characterized in that: the main oil cylinder has four external oil ports, two of which are working oil ports, which are respectively connected to the high-pressure working oil of the main oil circuit and the oil return pipe The other two oil ports connect the two buffer chambers of the main cylinder with the reversing device to provide the reversing control signal. 4. The buffer cylinder series extended range hydraulic oscillating cylinder according to claim 1, characterized in that: four oil inlet and outlet check valves are installed on the inlet and outlet ports of the two working chambers of the buffer cylinder, and the hydraulic oil can only be sent from the oil return pipe. The fuel tank enters the buffer cylinder and discharges to the accumulator. 5. According to claims 1 and 4, the buffer cylinder series extended-range hydraulic oscillation cylinder is characterized in that three check valves are installed at the oil inlet and outlet of the accumulator, and after the hydraulic oil enters the accumulator, it can only be controlled by The valve discharges to the oil pump supply system and cannot reverse flow. 6. The buffer cylinder series extended-range hydraulic oscillation cylinder according to claim 1, characterized in that: the effective working area of the main cylinder is larger than the effective working area of the corresponding buffer cylinder.

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