Differential control system of hydraulic energy accumulator

Abstract

The invention relates to the technical field of hydraulic transmission, in particular to a hydraulic accumulator differential control system which comprises a hydraulic cylinder, an electromagnetic reversing valve, a transition block, a differential counterbalance valve, a hydraulic control reversing valve, a working oil way A cavity, a working oil way B cavity, a control oil way X1 and a control oil way X2. The electromagnetic directional valve comprises an oil port P, an oil port T, an oil port A and an oil port B. The oil supply way is connected with the oil port P, and the oil return way is connected with the oil port T. Through application of specially manufactured valves and special loop design, the function that a single control loop meets various complex control requirements is achieved, the system operation performance is improved, and the production and manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission, and in particular to a hydraulic accumulator differential control system. Background Art

[0002] The hydraulic cylinder is one of the important components of engineering machinery and equipment. It plays the role of an actuator and can convert hydraulic energy into mechanical energy to achieve the extension and retraction of the actuator. When used, the control method and principle of the hydraulic pump as a power source to drive the hydraulic cylinder have become increasingly mature.

[0003] In actual use, each hydraulic system is composed of some basic circuits. The so-called basic circuit is composed of some hydraulic components and is an oil circuit structure used to complete specific functions. However, for complex multi-function control, it is generally completed by combining multiple single-function control circuits, which is complicated to operate, has high production and manufacturing costs, and low application efficiency. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a hydraulic accumulator differential control system, which, through the application of specially manufactured valve components and special circuit design, realizes the function of a single control circuit meeting multiple complex control requirements, improves system operating performance and reduces production costs.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is a hydraulic accumulator differential control system, including a hydraulic cylinder, an electromagnetic reversing valve, a transition block, a differential counterbalance valve, a hydraulically controlled reversing valve, a working oil circuit A cavity, a working oil circuit B cavity, a control oil circuit X1 and a control oil circuit X2, the hydraulic cylinder is provided with a rod cavity and a rodless cavity; the electromagnetic reversing valve includes an oil port P, an oil port T, an oil port A and an oil port B, the oil supply circuit is connected to the oil port P, and the oil return circuit is connected to the oil port T; the transition block provides control oil for the hydraulically controlled reversing valve; the electromagnetic reversing valve, the transition block and the differential counterbalance valve are stacked and installed, and the transition block is arranged between the battery reversing valve and the differential counterbalance valve; the hydraulically controlled reversing valve includes an oil port A1, an oil port T, an oil port A and an oil port B. B1 and oil port P1; one end of the working oil circuit A chamber is connected to the oil port A, and the other end is connected to the oil port A1 and the rodless chamber in sequence through the transition block and the differential counter-balancing valve; one end of the working oil circuit B chamber is connected to the oil port B, and the other end is connected to the oil port P1, the oil port B1, the pressure relay, the accumulator and the rod chamber in sequence through the transition block and the differential counter-balancing 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 oil port of the hydraulically controlled reversing 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 oil port of the hydraulically controlled reversing valve.

[0006] Furthermore, the differential counterbalancing valve includes a counterbalancing valve, a one-way valve and a control oil circuit X3, the counterbalancing valve is arranged in the working oil circuit A chamber, the one-way valve is arranged 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 between the control oil circuit X3 and the working oil circuit B chamber is located in front of the differential counterbalancing valve.

[0008] Furthermore, the working oil circuit A chamber draws out control oil through the transition block to act on the control oil port on the right side of the hydraulically controlled reversing valve, and the working oil circuit B chamber draws out control oil through the transition block to act on the control oil port on the left side of the hydraulically controlled reversing valve.

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

[0010] Furthermore, when the electromagnetic reversing valve is working in the left position, the working oil circuit B chamber is under high pressure, the control oil circuit X3 is under high pressure, the counterbalancing valve is opened, and the high-pressure oil simultaneously pushes the hydraulically controlled reversing valve to work in the left position through the control oil circuit X1, the oil port B1 is connected with 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 retracts.

[0011] Furthermore, when the electromagnetic reversing valve is working in the right position, the working oil circuit A chamber is under high pressure, and the high-pressure oil simultaneously pushes the hydraulically controlled reversing valve to work in the right position through the control oil circuit X2. The oil port A1 and the oil port P1 are connected through the hydraulically controlled reversing valve, and 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, and the effective area of ​​the rodless chamber is larger than the effective area of ​​the rod chamber. The hydraulic cylinder performs an extension movement under the action of the differential force.

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

[0013] Furthermore, after the hydraulic cylinder stops moving under the action of an 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 the present invention are as follows: through the application of specially manufactured valve parts and special circuit design, a single control circuit can meet the function of multiple complex control requirements, improve system operation performance, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a hydraulic principle diagram of the electromagnetic reversing valve of the present invention working in the left position; Figure 2 It is a hydraulic principle diagram of the electromagnetic reversing valve of the present invention working in the right position; In the figure: 100, hydraulic cylinder, 110, rod chamber, 120, rodless chamber, 200, electromagnetic reversing valve, 210, working oil circuit A chamber, 220, working oil circuit B chamber, 300, transition block, 310, control oil circuit X1, 320, control oil circuit X2, 400, differential counterbalance valve, 410, counterbalance valve, 420, check valve, 430, control oil circuit X3, 500, hydraulically controlled reversing valve, 600, accumulator, 700. Pressure relay. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0017] like Figure 1 , Figure 2As shown, the hydraulic cylinder 100 is an actuator of the hydraulic transmission system. A hydraulic accumulator differential control system according to an embodiment of the present invention includes the hydraulic cylinder 100, an electromagnetic reversing valve 200, a transition block 300, a differential counterbalance valve 400, a hydraulic control reversing valve 500, a working oil circuit A cavity 210, a working oil circuit B cavity 220, a control oil circuit X1 310 and a control oil circuit X2 320, the hydraulic cylinder 100 is provided with a rod chamber 110 and a rodless chamber 120; the electromagnetic reversing valve 200 includes an oil port P, an oil port T, an oil port A and an oil port B, the oil supply circuit is connected to the oil port P, and the oil return circuit is connected to the oil port T; the transition block 300 provides control oil for the hydraulic control reversing valve 500; the electromagnetic reversing valve 200, the transition block 300 and the differential counterbalance valve 400 are superimposed and installed, and the transition block 300 is arranged between the electromagnetic reversing valve 200 and the differential counterbalance valve 400; the hydraulic control reversing valve 500 includes an oil port A1, an oil port B1 and an oil port P1; the working oil circuit A chamber 210, one end of which is connected to the oil port A, and the other end is connected to the oil port A through the transition block 300 and The differential counterbalancing valve 400 is connected to the oil port A1 and the rodless chamber 120; the working oil circuit B chamber 220 is connected to the oil port B at one end, and the other end is connected to the oil port P1, the oil port B1, the pressure relay 700, the accumulator 600 and the rod chamber 110 in sequence through the transition block 300 and the differential counterbalancing valve 400; one end of the control oil circuit X1310 is connected to the working oil circuit B chamber 220 through the transition block 300, and the other end is connected to the control oil port of the hydraulically controlled reversing valve 500; and one end of the control oil circuit X2320 is connected to the working oil circuit A chamber 210 through the transition block 300, and the other end is connected to the control oil port of the hydraulically controlled reversing valve 500.

[0018] It should be noted that in the above-mentioned hydraulic accumulator differential control system: the electromagnetic reversing valve 200 controls the movement direction of the hydraulic cylinder 100 according to the instruction; the transition block 300 provides control oil for the hydraulic control reversing valve 500; the hydraulic control reversing valve 500 has two functions, one is to build a differential circuit under the action of the hydraulic control signal when the hydraulic cylinder 100 extends, and the other is to switch the accumulator 600 pressure compensation chamber according to the hydraulic control signal to maintain the hydraulic system pressure stable and ensure the output force of the hydraulic cylinder 100 is stable; the accumulator 600 provides an auxiliary power source for the system when the hydraulic cylinder 100 moves, thereby increasing the running speed of the hydraulic cylinder 100. After the hydraulic cylinder 100 stops moving under the action of the external load, the accumulator 600 is used to compensate for the system leakage to maintain the hydraulic system pressure stable and ensure the output force of the hydraulic cylinder 100 is stable, and the pressure relay 700 is used to monitor the pressure of the accumulator 600 and control the start and stop of the hydraulic pump.

[0019] Furthermore, the transition block 300 is an independent stacked valve block.

[0020] In one embodiment, the differential counterbalancing valve 400 includes a counterbalancing valve 410, a one-way valve 420 and a control oil circuit X3 430. The counterbalancing valve 410 is arranged in the working oil circuit A chamber 210, and the one-way valve 420 is arranged 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 oil port of the counterbalancing valve 410. The differential counterbalancing valve 400 is a specially manufactured valve component. First, it builds a differential control circuit together with the hydraulically controlled reversing valve 500, and second, it is a safety pressure relief protection. The counterbalancing valve 410 on the working oil circuit A chamber 210 has the dual functions of pressure maintaining and safety pressure relief valve, and the one-way valve 420 on the working oil circuit B chamber 220 prevents pressure relief.

[0021] Furthermore, the connection between the control oil circuit X3 430 and the working oil circuit B chamber 220 is located before the differential counterbalance valve 400 .

[0022] In one embodiment, the working oil circuit A chamber 210 draws out control oil through the transition block 300 to act on the control oil port on the right side of the hydraulically controlled reversing valve 500, and the working oil circuit B chamber 220 draws out control oil through the transition block 300 to act on the control oil port on the left side of the hydraulically controlled reversing valve 500.

[0023] 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, the accumulator 600 is used to compensate for system leakage and maintain the stability of the hydraulic system pressure, thereby 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.

[0024] The working principle of the above-mentioned hydraulic accumulator differential control system: the bidirectional pressure-maintaining differential control circuit of the hydraulic accumulator 600 can realize the cylinder differential control and maintain the stable output force of the hydraulic cylinder 100.

[0025] like Figure 1 As shown, in one embodiment, when the electromagnetic reversing valve 200 is switched to the left position according to the instruction, high-pressure oil enters the working oil circuit B chamber 220, the control oil circuit X3 430 is high pressure, the counterbalance valve is opened, and the high-pressure oil simultaneously pushes the hydraulic control reversing valve 500 to the left position through the control oil circuit X1 310, the oil port B1 is connected with the oil port P1, the working oil circuit A chamber 210 and the working oil circuit B chamber 220 are not connected, the accumulator 600 is connected with the rod chamber 110 of the hydraulic cylinder 100, the rod chamber 110 of the hydraulic cylinder 100 is high pressure, and the rodless chamber 120 is low pressure, the hydraulic cylinder 100 retracts, and after the hydraulic cylinder 100 retracts to the bottom, the pressure in the rod chamber 110 increases, and after reaching the set pressure of the pressure relay 700, the pressure relay 700 sends a signal, the equipment stops working, and the accumulator 600 and the pressure relay 700 cooperate to stabilize the output force of the hydraulic cylinder 100.

[0026] like Figure 2 As shown, in another embodiment, when the electromagnetic reversing valve 200 is switched to the right position according to the instruction, the high-pressure oil enters the working oil circuit A chamber 210, and the high-pressure oil simultaneously pushes the hydraulic control reversing valve 500 to the right position through the control oil circuit X2 320, the oil port A1 and the oil port P1 are connected through the hydraulic control reversing valve 500, the working oil circuit A chamber 210 and the working oil circuit B chamber 220 are connected, the accumulator 600 is connected with the two working chambers of the hydraulic cylinder 100, the pressure is equal, the force area of ​​the rodless chamber 120 is larger than the force area 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 the differential force, and the cylinder rod contacts the load After the pressure increases and reaches the set pressure of the pressure relay 700, the pressure relay 700 sends a signal, the equipment stops working, and the accumulator 600 and the pressure relay 700 cooperate to stabilize the output force of the hydraulic cylinder 100; since the one-way valve 420 is installed in the working oil circuit B chamber 220, the return oil of the rod chamber 110 cannot return to the T port, and flows to the working oil circuit A chamber 210 through the hydraulically controlled reversing valve 500, increasing the oil inlet amount of the working oil circuit A chamber 210 and improving the movement speed of the cylinder.

[0027] 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.

[0028] On the basis of the above-mentioned hydraulic accumulator differential control system, further, when the load of the hydraulic cylinder 100 increases, the hydraulic cylinder 100 is pushed to move in the retracting direction, and the pressure in the working oil circuit A chamber 210 increases. When it exceeds the set pressure of the counterbalance valve 410, the counterbalance valve 410 opens to release pressure, and the leaked oil returns to the oil port T.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in 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 may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. A hydraulic accumulator differential control system, characterized in that: include A hydraulic cylinder having a rod chamber and a rodless chamber; The electromagnetic reversing valve comprises an oil port P, an oil port T, an oil port A and an oil port B, wherein the oil supply circuit is connected to the oil port P, and the oil return circuit is connected to the oil port T; Transition block, providing control oil for hydraulically controlled reversing valve; A differential counterbalance valve, wherein the electromagnetic reversing valve, the transition block and the differential counterbalance valve are installed in a stacked manner, and the transition block is arranged between the battery reversing valve and the differential counterbalance valve; A hydraulically controlled reversing valve, including an oil port A1, an oil port B1 and an oil port P1; A working oil circuit A chamber, one end of which is connected to the oil port A, and the other end of which is connected to the oil port A1 and the rodless chamber through the transition block and the differential counterbalance valve in sequence; A working oil circuit B chamber, one end of which is connected to the oil port B, and the other end of which is connected to the oil port P1, the oil port B1, the pressure relay, the accumulator and the rod chamber in sequence through the transition block and the differential counterbalance valve; The control oil circuit X1 has one end connected to the working oil circuit B chamber through the transition block, and the other end connected to the control oil port of the hydraulically controlled reversing valve; The control oil circuit X2 has one end connected to the working oil circuit A cavity through the transition block, and the other end connected to the control oil port of the hydraulically controlled reversing valve.

2. A hydraulic accumulator differential control system according to claim 1, characterized in that: The differential counterbalancing valve includes a counterbalancing valve, a one-way valve and a control oil circuit X3. The counterbalancing valve is arranged in the working oil circuit A chamber, the one-way valve is arranged 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.

3. A hydraulic accumulator differential control system according to claim 2, characterized in that: The connection between the control oil circuit X3 and the working oil circuit B chamber is located in front of the differential counterbalance valve.

4. A hydraulic accumulator differential control system according to claim 1, characterized in that: The working oil circuit A chamber draws out control oil through the transition block to act on the control oil port on the right side of the hydraulically controlled reversing valve, and the working oil circuit B chamber draws out control oil through the transition block to act on the control oil port on the left side of the hydraulically controlled reversing valve.

5. A hydraulic accumulator differential control system according to claim 1, characterized in that: The transition block is an independent superimposed valve block.

6. A hydraulic accumulator differential control system according to claim 1, characterized in that: When the electromagnetic reversing valve works in the left position, the working oil circuit B chamber is under high pressure, the control oil circuit X3 is under high pressure, the counter-balancing valve is opened, and the high-pressure oil simultaneously pushes the hydraulically controlled reversing valve to work in the left position through the control oil circuit X1. The oil port B1 is connected with the oil port P1, and the working oil circuit A chamber is not connected with the working oil circuit B chamber, so that the rod chamber is under high pressure and the rodless chamber is under low pressure, and the hydraulic cylinder retracts.

7. A hydraulic accumulator differential control system according to claim 1, characterized in that: When the electromagnetic reversing valve is working in the right position, the working oil circuit A chamber is under high pressure, and the high-pressure oil simultaneously pushes the hydraulically controlled reversing valve to work in the right position through the control oil circuit X2. The oil port A1 and the oil port P1 are connected through the hydraulically controlled reversing valve, and 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, and the effective area of ​​the rodless chamber is greater than the effective area of ​​the rod chamber. The hydraulic cylinder performs an extension movement under the action of the differential force.

8. A hydraulic accumulator differential control system according to claim 7, characterized in that: When the load of the hydraulic cylinder increases, the hydraulic cylinder moves in the retracting direction, and the pressure in the chamber A of the working oil circuit increases. When the pressure exceeds the set pressure of the counterbalance valve, the counterbalance valve opens to release the pressure.

9. A hydraulic accumulator differential control system according to claim 1, characterized in that: After the hydraulic cylinder stops moving under the action of an 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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