A superimposed combined hydraulic lock

Abstract

The present invention discloses a superimposed combined hydraulic lock, which includes two oil circuits, one of which is provided with a one-way valve, and cooperates with the use of a DSG01‑3C4 solenoid valve and a superimposed pressure reducing valve to achieve the pressure maintenance of hydraulic oil. The hydraulic lock cooperates with the superimposed pressure reducing valve, and a control oil pipe is connected from the oil inlet of the oil circuit A provided with a one-way valve to control the small valve core, the small valve seat and the small piston. When the system is working normally, the pressure of the oil inlet can be adjusted up and down, which solves the problem that the conventional technology of ordinary liquid lock can only adjust upward after the pressure is locked, and effectively prevents the consequences caused by the loss of pressure caused by the sudden power failure of the hydraulic system.

Description

Technical Field

[0001] The invention belongs to hydraulic system control technology, in particular to a superimposed combined hydraulic lock. Background Art

[0002] Hydraulic lock, also often called "pressure-maintaining valve", is used to maintain the stability of pressure in the hydraulic system to meet the system oil pressure to meet the working standard. For hydraulic control check valve pressure maintenance, the hydraulic lock is generally composed of two hydraulic check valves. The hydraulic lock locks the circuit and controls the return of hydraulic oil to ensure that the cylinder can maintain its position even under a certain load outside.

[0003] In conventional hydraulic locks, after the pressure is locked at the oil outlet, the pressure at the oil outlet can only be adjusted upward and cannot be reduced, making it inconvenient to achieve flexible pressure adjustment. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a hydraulic lock that can achieve flexible adjustment of pressure.

[0005] Technical solution: A superimposed combined hydraulic lock, including oil circuit A and oil circuit B. Oil circuit A is provided with a one-way valve, including a large valve seat and a large valve core connected to a spring. In the hydraulic lock, oil circuit A forms a pressure-maintaining chamber between the large valve core and the hydraulic control piston, and oil circuit B is in a connected state;

[0006] The hydraulic lock is also provided with a pressure-maintaining regulating valve, the oil inlet pipe of the pressure-maintaining regulating valve is connected to the oil inlet end of the oil circuit A, and the oil outlet pipe of the pressure-maintaining valve is connected to the oil outlet end of the oil circuit A. The pressure-maintaining regulating valve includes a small piston, a small valve seat and a small valve core, and the small valve core is connected to an adjusting spring;

[0007] When the hydraulic lock is maintaining pressure, the small piston always pushes the small valve core open, and the oil inlet and oil outlet of oil circuit A are connected, so that the pressure regulation of the oil inlet of oil circuit A is realized;

[0008] When the hydraulic lock is depressurized, the small valve core forms a sealing structure with the small valve seat under the action of the spring, thereby locking the pressure of the oil circuit A.

[0009] Furthermore, a hydraulically controlled piston is provided between the oil circuit A and the oil circuit B. In the oil circuit B, the hydraulically controlled piston presses against the end of the valve body, and the oil circuit B is a normally open oil circuit.

[0010] Furthermore, the oil circuit A includes an oil inlet A1 and an oil outlet A2, a one-way valve is arranged between the oil inlet A1 and the oil outlet A2, and the one-way valve includes a large piston, a large valve seat, a large valve core and a spring;

[0011] When oil enters the oil inlet A1 to maintain pressure, the oil pressure pushes open the large valve core and compresses the spring. When oil enters the oil inlet A1 to release pressure, the large valve core presses against the large valve seat to form a seal.

[0012] Furthermore, a control valve is provided on the oil pipe of the pressure-maintaining regulating valve and the pipeline of the oil circuit A to control its on and off; the regulating spring is provided with an adjusting device to adjust the force acting on the small valve core; the hydraulic control piston is provided with a control solenoid valve to control the sliding position.

[0013] Working principle: The superimposed combined hydraulic lock described in the present invention is provided with a one-way valve at the oil inlet, and an oil circuit is led out to enter the pressure maintaining regulating valve. The small piston of the pressure maintaining regulating valve controls the oil to connect to the oil inlet of the oil circuit A. When the oil inlet A1 is pressurized, the small piston always presses against the small valve core, and the oil inlet A1 is connected. At this time, the pressure of the oil inlet A1 can be freely adjusted up and down. When the oil inlet A1 is depressurized, the small valve core quickly presses against the small valve seat under the action of the adjusting spring, and the pressure of the oil circuit A is locked to prevent serious consequences caused by pressure loss of the oil circuit A when the hydraulic system is suddenly powered off.

[0014] Beneficial effect: Compared with the prior art, the present invention adopts a superimposed combined hydraulic lock structure. On the basis of oil circuit A and oil circuit B, a control oil circuit is led out from the oil inlet to set a pressure regulating valve. The existing hydraulic lock can only be adjusted upward after the oil outlet pressure is locked, while the present invention can achieve free up and down adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a hydraulic lock connection structure diagram based on the existing technology;

[0016] FIG. 2 is a schematic diagram of the structure of the hydraulic lock according to the present invention. DETAILED DESCRIPTION

[0017] In order to explain the technical solution disclosed by the present invention in detail, further elaboration is made below in conjunction with the accompanying drawings of the specification.

[0018] In hydraulic systems, it is often necessary to keep the pressure constant or change slightly during a short period of time when the cylinder is not working. The corresponding method is to add a liquid lock device, which is called a hydraulic lock or a pressure maintaining valve.

[0019] Existing hydraulic locks are generally composed of two parallel hydraulic one-way valves and a hydraulic piston. There are also those composed of steel balls, springs, hydraulic ports and control plungers, with corresponding oil inlet, oil return and control ports. The role of the steel ball needs to be coordinated with the gravity to achieve blocking. Further combination Figure 1 As shown, Figure 1The design shown is made under the existing technology, combined with the function of the hydraulic solenoid valve. When oil enters the oil inlet A1, under the action of pressure, the hydraulic control piston moves left, the springs on both sides are compressed, oil is discharged from the oil outlet A2, and then returned from the oil circuit B, which is also in the connected state. Another working state is that oil enters the oil inlet B1, and under the action of pressure, the oil is transmitted in the reverse direction. Figure 1 The oil inlet A1 shown in the figure realizes oil return. However, when the oil is fed into the oil outlet A2 or the oil outlet B2, the oil enters the hydraulic chamber where the spring is located, which is blocked and cannot be discharged from the oil inlet A1 and the oil inlet B2, thus realizing one-way control and a short-term pressure-maintaining effect.

[0020] compared to Figure 1 , Figure 2 What is shown is a superimposed combined hydraulic lock provided by the present invention.

[0021] The stacked combined hydraulic lock provided by the present invention includes two oil circuits, one of which is provided with a one-way valve, and cooperates with the use of the DSG01-3C4 solenoid valve and the stacked pressure reducing valve to achieve the pressure maintenance of the hydraulic oil. The hydraulic lock cooperates with the stacked pressure reducing valve, and connects a control oil pipe from the oil inlet of the oil circuit A provided with the one-way valve to control the small valve core, the small valve seat and the small piston. When the system is working normally, the pressure of the oil inlet can be adjusted up and down, which solves the problem that the conventional technology of ordinary hydraulic lock can only adjust the pressure upward after the pressure is locked, and effectively prevents the consequences of pressure loss caused by sudden power failure of the hydraulic system.

[0022] Specifically, the hydraulic lock includes two oil circuits, oil circuit A and oil circuit B. Oil circuit A includes an oil inlet A1 and an oil outlet A2. Oil circuit B is provided with an oil inlet B1 and an oil outlet B2. There is a hydraulically controlled piston between oil circuit A and oil circuit B. The hydraulically controlled piston is provided with a control solenoid valve. A large valve seat 5 and a large valve core 6 are provided on oil circuit A. A spring is provided at the rear end of the large valve core 6. When oil is fed into the oil inlet A1 to maintain pressure, the hydraulically controlled piston and the spring are both subjected to pressure under the action of pressure, the spring is compressed, and the hydraulically controlled piston presses against the end 4 of the valve body. At this time, oil circuit A is connected. When oil is fed into the oil inlet A1 to release pressure, the spring forces the large valve core 6 to press against the large valve seat 5 to form a seal, and a pressure-maintaining chamber is formed between the hydraulically controlled piston and the large valve core 5 and the large valve seat 6. Oil circuit B is always in a connected state to achieve oil return or oil inlet control.

[0023] compared to Figure 2 The structure shown is Figure 1 In the existing structure shown, the path of one-way transmission of hydraulic oil is different, and the pressure holding area formed is also different, including a control oil port T provided on the pressure holding regulating valve.

[0024] Furthermore, in the hydraulic lock described in the present invention, an oil pipe is led out from the oil inlet A1 to enter the pressure-maintaining regulating valve. The pressure-maintaining regulating valve includes a small valve core 3, a small valve seat 2 and a small piston 1. An adjusting spring is also provided at the rear end of the small piston 1. The small piston 1 is used to open the small one-way valve and push open the small valve core 3 when the oil inlet A1 is pressurized. When the oil inlet A1 is pressurized, the small piston 1 always pushes open the small valve core 3. When the oil inlet A1 is filled with oil to release pressure, the small valve core 3 quickly presses against the small valve seat 2 under the action of the adjusting spring, and the oil inlet A1 is pressure-locked. In the pressure-maintaining regulating valve, the control oil is connected to the oil inlet A1, and after passing through the pressure-maintaining zone formed between the small valve core 3 and the small valve seat 2, the oil outlet pipeline is connected to the oil outlet A2 end. In the pressure-maintaining regulating valve, the hydraulic oil flows through the gap between the small piston 1 and the small valve core 3.

[0025] In this embodiment, the pressure-maintaining regulating valve is arranged on one side of the main body of the oil circuit B. For the convenience of installation and maintenance, a control valve is arranged on the pipeline from the pressure-maintaining regulating valve to the oil inlet A1. The control valve controls the on-off of the pipeline and is preferably arranged at the connection between the pressure-maintaining regulating valve and the main body of the oil circuit B. In order to better control the pressure regulation of the pressure-maintaining valve, a tension adjustment mechanism can be arranged for the regulating spring connected to the small valve core 3 to achieve better control.

[0026] Finally, in the process of implementing the present invention, the technical means that those skilled in the art should know will not be elaborated, including the improvement of sealing effect, optimization of structure, adjustment of relative position, etc. It is further pointed out that compared with the prior art, the present invention first changes the traditional liquid lock control structure, including the oil circuits for oil inlet and oil return. Second, when the existing liquid lock is locked at the oil inlet pressure, it can only adjust the pressure upward, but not downward. Under the action of the pressure-maintaining regulating valve, the present invention can achieve free up and down adjustment. Third, the prior art combines solenoid valve control for control, but it should be noted that in the existing structure, when the hydraulic system is powered off and the solenoid valve fails, the hydraulic control piston can move left and right, which can easily cause the oil inlet to lose pressure, causing serious damage to the equipment in the hydraulic system and the consequences thereof.

Claims

1. A superimposed combined hydraulic lock, comprising an oil circuit A and an oil circuit B, wherein the oil circuit A is provided with a one-way valve, the one-way valve comprising a hydraulically controlled piston, a large valve seat (5) and a large valve core (6) connected to a spring, characterized in that: In the hydraulic lock, oil circuit A forms a pressure-maintaining chamber between the hydraulic control piston, the large valve core (6) and the large valve seat (5), and oil circuit B is in a connected state; The hydraulic lock is further provided with a bypass pressure-maintaining valve, the piston control oil port of the bypass pressure-maintaining valve is connected to the oil inlet end of the oil circuit A, the oil outlet pipe of the bypass pressure-maintaining valve is connected to the oil outlet end of the oil circuit A, the bypass pressure-maintaining valve comprises a small piston (1), a small valve seat (2) and a small valve core (3), and the small valve core (3) is connected to an adjusting spring; When the hydraulic lock is normally pressurized in the pressure-maintaining chamber on the oil circuit A, the small piston (1) always pushes open the small valve core (3), and the oil inlet and the oil outlet of the oil circuit A are connected, so that the pressure of the oil inlet and the oil outlet of the oil circuit A can be adjusted up and down; When the hydraulic lock is releasing pressure, the small valve core (3) forms a sealing structure with the small valve seat (2) under the action of the regulating spring, thereby locking the pressure of the oil circuit A; The oil circuit A includes an oil inlet A1 and an oil outlet A2, and the one-way valve is arranged between the oil inlet A1 and the oil outlet A2; When oil is introduced into the oil inlet A1 to maintain pressure, the oil pressure pushes open the large valve core (6) and compresses the spring. When oil is introduced into the oil inlet A1 to release pressure, the large valve core (6) pushes against the large valve seat (5) to form a seal.

2. The superimposed combined hydraulic lock according to claim 1, characterized in that: A hydraulically controlled piston is provided between the oil circuit A and the oil circuit B. In the oil circuit B, the hydraulically controlled piston presses against the end of the valve body, and the oil circuit B is a normally open oil circuit.

3. The superimposed combined hydraulic lock according to claim 1 is characterized in that: A control valve is provided on the oil pipe of the pressure-maintaining regulating valve and the pipeline of the oil circuit A to control the on-off thereof.

4. The superimposed combined hydraulic lock according to claim 1, characterized in that: The regulating spring is provided with a tension regulating mechanism for regulating the force acting on the small valve core (3).

5. The superimposed combined hydraulic lock according to claim 2, characterized in that: The hydraulically controlled piston is provided with a control slide for controlling the electromagnetic valve.

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