A hydraulic accumulator differential control system

Abstract

The present application relates to the technical field of hydraulic transmission, in particular to a kind of hydraulic accumulator differential control system, including hydraulic cylinder, electromagnetic reversing valve, transition block, differential counterweight valve, hydraulic control reversing valve, working oil circuit A cavity, working oil circuit B cavity, control oil circuit X1 and control oil circuit X2, the hydraulic cylinder is equipped with rod cavity and rodless cavity;The electromagnetic reversing valve includes oil port P, oil port T, oil port A and oil port B, oil supply line is connected with the oil port P, and oil return line is connected with the oil port T.It realizes the function that single control circuit satisfies multiple complex control requirements by the application of special manufacturing valve and special circuit design, improves system operating performance, reduces production manufacturing cost.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic transmission, specifically to a differential control system for a hydraulic accumulator. Background Technology

[0002] Hydraulic cylinders are one of the important components of engineering machinery and equipment, playing the role of actuators. They can convert hydraulic energy into mechanical energy to realize the extension and retraction of actuators. In application, the control method and principle of using hydraulic pumps as power sources to drive the hydraulic cylinders have become increasingly mature.

[0003] In practical applications, every hydraulic system is composed of some basic circuits. A basic circuit is a hydraulic circuit structure composed of some hydraulic components to complete a specific function. However, for complex multi-function control, it is generally accomplished by combining multiple single-function control circuits, which is complicated to operate, has high manufacturing costs, and low application efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a differential control system for a hydraulic accumulator, which achieves the function of a single control loop meeting multiple complex control requirements through the application of specially manufactured valves and special circuit design, thereby improving system operating performance and reducing production and manufacturing costs.

[0005] To achieve the above objectives, the present invention provides a differential control system for a hydraulic accumulator, comprising a hydraulic cylinder, an electromagnetic directional valve, a transition block, a differential counterbalancing valve, a hydraulically controlled directional valve, a working oil circuit A chamber, a working oil circuit B chamber, a control oil circuit X1, and a control oil circuit X2. The hydraulic cylinder has a rod-side chamber and a rodless chamber. The electromagnetic directional valve includes ports P, T, A, and B, with a supply oil circuit connected to port P and a return oil circuit connected to port T. The transition block provides control oil to the hydraulically controlled directional valve. The electromagnetic directional valve, the transition block, and the differential counterbalancing valve are stacked together, with the transition block positioned between the accumulator directional valve and the differential counterbalancing valve. The hydraulically controlled directional valve includes port A1, port... B1 and port P1; one end of the working oil circuit A chamber is connected to port A, and the other end is connected to port A1 and the rodless chamber in sequence through the transition block and the differential counterbalancing valve; one end of the working oil circuit B chamber is connected to port B, and the other end is connected to port P1, port B1, pressure relay, accumulator and rod chamber in sequence through the transition block and the differential counterbalancing valve; one end of the control oil circuit X1 is connected to the working oil circuit B chamber through the transition block, and the other end is connected to the control port of the hydraulic directional valve; and one end of the control oil circuit X2 is connected to the working oil circuit A chamber through the transition block, and the other end is connected to the control port of the hydraulic directional valve.

[0006] Furthermore, the differential counterbalancing valve includes a counterbalancing valve, a check valve, and a control oil circuit X3. The counterbalancing valve is disposed in the working oil circuit A chamber, the check valve is disposed in the working oil circuit B chamber, one end of the control oil circuit X3 is connected to the working oil circuit B chamber, and the other end is connected to the control oil port of the counterbalancing valve.

[0007] Furthermore, the connection point between the control oil circuit X3 and the working oil circuit B chamber is located upstream of the differential counterbalancing valve.

[0008] Furthermore, the working oil circuit A chamber leads out control oil through the transition block and acts on the control oil port on the right side of the hydraulic directional valve, and the working oil circuit B chamber leads out control oil through the transition block and acts on the control oil port on the left side of the hydraulic directional valve.

[0009] Furthermore, the transition block is an independently stacked valve block.

[0010] Furthermore, when the solenoid directional valve is in the left position, the working oil circuit B chamber is under high pressure, the control oil circuit X3 is under high pressure, the counterbalance valve is open, and the high-pressure oil simultaneously pushes the hydraulic directional valve to the left position through the control oil circuit X1. The oil port B1 is connected to the oil port P1, the working oil circuit A chamber and the working oil circuit B chamber are not connected, so that the rod chamber is under high pressure and the rodless chamber is under low pressure, and the hydraulic cylinder performs a retraction movement.

[0011] Furthermore, when the electromagnetic directional valve is in the right position, the working oil circuit A chamber is under high pressure. The high-pressure oil simultaneously drives the hydraulic directional valve to the right position through the control oil circuit X2. The oil port A1 and oil port P1 are connected through the hydraulic directional valve. The working oil circuit A chamber and the working oil circuit B chamber are connected. The pressures of the working oil circuit A chamber and the working oil circuit B chamber are equal. The effective area of ​​the rodless chamber is larger than the effective area of ​​the rod chamber. The hydraulic cylinder extends under the action of differential force.

[0012] Furthermore, when the load on the hydraulic cylinder increases, the hydraulic cylinder moves in the retracting direction, and the pressure in the working oil circuit A chamber rises. When the pressure exceeds the set pressure of the counterbalancing valve, the counterbalancing valve opens to release pressure.

[0013] Furthermore, after the hydraulic cylinder stops moving under external load, the accumulator is used to compensate for system leakage, and the pressure relay is used to monitor the pressure of the accumulator and control the start and stop of the hydraulic pump.

[0014] The beneficial effects of this invention are: by using specially manufactured valve components and special circuit design, a single control circuit can meet the functions of multiple complex control requirements, thereby improving system performance and reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a hydraulic schematic diagram of the electromagnetic directional valve operating in the left position according to the present invention.

[0016] Figure 2 This is a hydraulic schematic diagram of the electromagnetic directional valve operating in the right position according to the present invention.

[0017] In the diagram: 100, hydraulic cylinder; 110, rod-mounted chamber; 120, rodless chamber.

[0018] 200. Solenoid directional valve; 210. Working oil circuit A chamber; 220. Working oil circuit B chamber.

[0019] 300. Transition block; 310. Control oil circuit X1; 320. Control oil circuit X2.

[0020] 400. Differential counterbalancing valve; 410. Counterbalancing valve; 420. Check valve; 430. Control oil circuit X3.

[0021] 500. Hydraulic directional valve.

[0022] 600. Accumulator

[0023] 700. Pressure relay. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] like Figure 1 , Figure 2As shown, the hydraulic cylinder 100 is the actuator of the hydraulic transmission system. An embodiment of the present invention provides a differential control system for a hydraulic accumulator, including the hydraulic cylinder 100, an electromagnetic directional valve 200, a transition block 300, a differential counterbalancing valve 400, a hydraulically controlled directional valve 500, working oil circuit A chamber 210, working oil circuit B chamber 220, control oil circuit X1 310, and control oil circuit X2. 320, the hydraulic cylinder 100 is provided with a rod chamber 110 and a rodless chamber 120; the solenoid directional valve 200 includes port P, port T, port A and port B, the oil supply line is connected to port P, and the oil return line is connected to port T; the transition block 300 provides control oil to the hydraulically controlled directional valve 500; the solenoid directional valve 200, the transition block 300 and the differential counterbalancing valve 400 are stacked together, and the transition block 300 is located between the solenoid directional valve 200 and the differential counterbalancing valve 400; the hydraulically controlled directional valve 500 includes port A1, port B1 and port P1; the working oil passage A chamber 210 is connected at one end to port A, and the other end passes through the transition block 300 and... The differential counterbalancing valve 400 is connected to port A1 and rodless chamber 120; the working oil circuit B chamber 220 is connected at one end to port B, and at the other end is connected to port P1, port B1, pressure relay 700, accumulator 600 and rod chamber 110 in sequence through transition block 300 and differential counterbalancing valve 400; one end of control oil circuit X1310 is connected to working oil circuit B chamber 220 through transition block 300, and the other end is connected to the control port of hydraulic directional valve 500; and one end of control oil circuit X2320 is connected to working oil circuit A chamber 210 through transition block 300, and the other end is connected to the control port of hydraulic directional valve 500.

[0026] It should be noted that in the above-mentioned differential control system for a hydraulic accumulator: the solenoid directional valve 200 controls the movement direction of the hydraulic cylinder 100 according to the command; the transition block 300 provides control oil to the hydraulically controlled directional valve 500; the hydraulically controlled directional valve 500 has two functions: first, when the hydraulic cylinder 100 extends, it establishes a differential circuit under the action of the hydraulic control signal; second, it switches the pressure compensation chamber of the accumulator 600 according to the hydraulic control signal to maintain the stability of the hydraulic system pressure and ensure the stability of the output force of the hydraulic cylinder 100; the accumulator 600 provides an auxiliary power source for the system when the hydraulic cylinder 100 moves, increasing the operating speed of the hydraulic cylinder 100. After the hydraulic cylinder 100 stops moving under the action of an external load, the accumulator 600 is used to compensate for system leakage and maintain the stability of the hydraulic system pressure, ensuring the stability of the output force of the hydraulic cylinder 100; the pressure relay 700 is used to monitor the pressure of the accumulator 600 and control the start and stop of the hydraulic pump.

[0027] Furthermore, the transition block 300 is an independently stacked valve block.

[0028] In one embodiment, the differential counterbalancing valve 400 includes a counterbalancing valve 410, a check valve 420, and a control oil circuit X3 430. The counterbalancing valve 410 is located in the working oil circuit A chamber 210, and the check valve 420 is located in the working oil circuit B chamber 220. One end of the control oil circuit X3 430 is connected to the working oil circuit B chamber 220, and the other end is connected to the control port of the counterbalancing valve 410. The differential counterbalancing valve 400 is a specially manufactured valve component. Firstly, it works together with the hydraulically controlled directional valve 500 to form a differential control circuit. Secondly, it provides safety pressure relief protection. The counterbalancing valve 410 in the working oil circuit A chamber 210 has a dual function of pressure holding and safety pressure relief valve, and the check valve 420 in the working oil circuit B chamber 220 prevents pressure relief.

[0029] Furthermore, the connection between the control oil circuit X3 430 and the working oil circuit B chamber 220 is located upstream of the differential counterbalance valve 400.

[0030] In one embodiment, the working oil circuit A chamber 210 leads out control oil through the transition block 300 to act on the control oil port on the right side of the hydraulic directional valve 500, and the working oil circuit B chamber 220 leads out control oil through the transition block 300 to act on the control oil port on the left side of the hydraulic directional valve 500.

[0031] In one embodiment, the accumulator 600 provides an auxiliary power source for the system when the hydraulic cylinder 100 moves, thereby increasing the operating speed of the hydraulic cylinder 100. After the hydraulic cylinder 100 stops moving under the action of an external load, it is used to compensate for system leakage and maintain the pressure stability of the hydraulic system, thereby ensuring the stable output force of the hydraulic cylinder 100. The pressure relay 700 is used to monitor the pressure of the accumulator 600 and control the start and stop of the hydraulic pump.

[0032] The working principle of the above-mentioned hydraulic accumulator differential control system is as follows: the hydraulic accumulator 600 bidirectional pressure-holding differential control circuit can realize the differential control of the oil cylinder and maintain the stable output force of the hydraulic cylinder 100.

[0033] like Figure 1 As shown, in one embodiment, when the electromagnetic directional valve 200 switches to the left position according to the command, high-pressure oil enters the working oil circuit B chamber 220, the control oil circuit X3 430 is under high pressure, the counterbalance valve opens, and the high-pressure oil simultaneously pushes the hydraulic directional valve 500 to the left position through the control oil circuit X1 310. Oil port B1 and oil port P1 are connected, the working oil circuit A chamber 210 and the working oil circuit B chamber 220 are not connected, the accumulator 600 is connected to the rod chamber 110 of the hydraulic cylinder 100, the rod chamber 110 of the hydraulic cylinder 100 is under high pressure, the rodless chamber 120 is under low pressure, the hydraulic cylinder 100 performs a retraction movement, after the hydraulic cylinder 100 retracts to the bottom, the pressure in the rod chamber 110 increases, and after reaching the pressure set by the pressure relay 700, the pressure relay 700 sends a signal, and the equipment stops working. The accumulator 600 and the pressure relay 700 work together to stabilize the output force of the hydraulic cylinder 100.

[0034] like Figure 2 As shown, in another embodiment, when the electromagnetic directional valve 200 switches to the right position according to the command, high-pressure oil enters the working oil circuit A chamber 210. At the same time, the high-pressure oil pushes the hydraulic directional valve 500 to the right position through the control oil circuit X2 320. Oil port A1 and oil port P1 are connected through the hydraulic directional valve 500. The working oil circuit A chamber 210 and the working oil circuit B chamber 220 are connected. The accumulator 600 and the two working chambers of the hydraulic cylinder 100 are connected and the pressure is equal. The force-bearing area of ​​the rodless chamber 120 is greater than that of the rod chamber 110. The piston rod moves in the direction of the smaller force. The hydraulic cylinder 100 extends under the action of differential force, and the cylinder rod contacts the load. After the pressure rises and reaches the set pressure of the pressure relay 700, the pressure relay 700 sends a signal and the equipment stops working. The accumulator 600 and the pressure relay 700 work together to stabilize the output force of the hydraulic cylinder 100. Since the working oil circuit B chamber 220 is equipped with a check valve 420, the oil return from the rod chamber 110 cannot return to the T port. Instead, it flows to the working oil circuit A chamber 210 through the hydraulic control directional valve 500, increasing the oil intake of the working oil circuit A chamber 210 and improving the movement speed of the cylinder.

[0035] It should be noted that the counterbalance valve 410 is opened by high-pressure oil and has a spring force that allows it to close automatically.

[0036] Based on the above-mentioned differential control system for a hydraulic accumulator, when the load on the hydraulic cylinder 100 increases, it is pushed to move in the retraction direction, and the pressure in the working oil circuit A chamber 210 increases. When the pressure exceeds the set pressure of the counterbalancing valve 410, the counterbalancing valve 410 opens to release pressure, and the leaked oil returns to the oil port T.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A differential control system for a hydraulic accumulator, characterized in that: include The hydraulic cylinder has a rod-type chamber and a rodless chamber; The electromagnetic reversing valve includes oil port P, oil port T, oil port A and oil port B, with the oil supply line connected to oil port P and the oil return line connected to oil port T; The transition block provides control oil to the hydraulically controlled directional valve. A differential counterbalancing valve is provided, wherein the solenoid directional valve, the transition block and the differential counterbalancing valve are stacked together, and the transition block is disposed between the solenoid directional valve and the differential counterbalancing valve; The hydraulically controlled directional valve includes port A1, port B1, and port P1; The working oil circuit A chamber is connected at one end to the oil port A, and at the other end to the oil port A1 and the rodless chamber in sequence through the transition block and the differential counterbalancing valve; The working oil circuit B chamber is connected at one end to the oil port B, and at the other end to the oil port P1, oil port B1, pressure relay, accumulator and rod chamber in sequence through the transition block and the differential counterbalance valve; The control oil circuit X1 is connected at one end to the working oil circuit B chamber through the transition block, and at the other end to the control oil port of the hydraulic directional valve. The control oil circuit X2 is connected at one end to the working oil circuit A chamber through the transition block, and at the other end to the control oil port of the hydraulic directional valve. The differential counterbalancing valve includes a counterbalancing valve, a check valve, and a control oil circuit X3. The counterbalancing valve is located in the working oil circuit A chamber, the check valve is located in the working oil circuit B chamber, and one end of the control oil circuit X3 is connected to the working oil circuit B chamber, and the other end is connected to the control oil port of the counterbalancing valve. The connection point between the control oil circuit X3 and the working oil circuit B chamber is located upstream of the differential counterbalance valve.

2. The differential control system for a hydraulic accumulator according to claim 1, characterized in that: The working oil circuit A chamber leads out control oil through the transition block and acts on the control oil port on the right side of the hydraulic directional valve, while the working oil circuit B chamber leads out control oil through the transition block and acts on the control oil port on the left side of the hydraulic directional valve.

3. The differential control system for a hydraulic accumulator according to claim 1, characterized in that: The transition block is an independently stacked valve block.

4. The differential control system for a hydraulic accumulator according to claim 1, characterized in that: When the electromagnetic directional valve is in the left position, the working oil circuit B chamber is under high pressure, the control oil circuit X3 is under high pressure, the counterbalance valve is open, and the high-pressure oil simultaneously pushes the hydraulic directional valve to the left position through the control oil circuit X1. The oil port B1 is connected to the oil port P1, and the working oil circuit A chamber and the working oil circuit B chamber are not connected, so that the rod chamber is under high pressure and the rodless chamber is under low pressure, and the hydraulic cylinder performs a retraction movement.

5. A differential control system for a hydraulic accumulator according to claim 1, characterized in that: When the electromagnetic directional valve is in the right position, the working oil circuit A chamber is under high pressure. At the same time, the high-pressure oil pushes the hydraulic directional valve to the right position through the control oil circuit X2. The oil port A1 and oil port P1 are connected through the hydraulic directional valve. The working oil circuit A chamber and the working oil circuit B chamber are connected. The pressures of the working oil circuit A chamber and the working oil circuit B chamber are equal. The effective area of ​​the rodless chamber is larger than the effective area of ​​the rod chamber. The hydraulic cylinder extends under the action of differential force.

6. A differential control system for a hydraulic accumulator according to claim 5, characterized in that: When the load on the hydraulic cylinder increases, the hydraulic cylinder moves in the retracting direction, and the pressure in the working oil circuit A chamber rises. When the pressure exceeds the set pressure of the counterbalancing valve, the counterbalancing valve opens to release pressure.

7. A differential control system for a hydraulic accumulator according to claim 1, characterized in that: After the hydraulic cylinder stops moving under external load, the accumulator is used to compensate for system leakage and the pressure relay is used to monitor the pressure of the accumulator and control the start and stop of the hydraulic pump.

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