A gravity energy storage multi-stage pressure hydraulic control system

Abstract

The application discloses a kind of gravity energy storage multistage pressure hydraulic control systems, it is related to hydraulic control technical field, including oil tank, oil tank is connected to oil pump, the oil outlet end of oil pump is connected to low pressure circuit and high pressure circuit, low pressure circuit connects first pressure reducing valve, the outlet end of first pressure reducing valve is connected at least two low pressure branch, high pressure circuit is connected with each low pressure branch and is connected with the branch valve for control opening and closing, branch valve other end is connected to corresponding branch proportional pressure valve, branch proportional pressure valve is connected to the oil inlet of corresponding working oil cylinder;The oil inlet of corresponding working oil cylinder is also connected throttle valve, throttle valve other end is also connected for control opening and closing circuit valve, circuit valve other end is connected to oil tank.The effect that it is achieved that multiple oil cylinders are simultaneously controlled under different pressures, and the working pressure of each oil cylinder can be accurately controlled, pressure reaches target value in short time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, in particular to a gravity energy storage multi-stage pressure hydraulic control system. BACKGROUND

[0002] In the gravity energy storage power generation system, there is a demand for lifting and carrying heavy objects. In order to realize the lifting of large-scale heavy objects from low to high positions and the orderly placement, a lifting system is needed. The system can lift / descend heavy objects, and can place the heavy objects on the high / low load beam through the horizontal moving system. The system requires the functions of lifting / descending heavy objects, horizontal moving of heavy objects and horizontal precise positioning.

[0003] For example, patent CN201820620050.3 "Unloading machine hydraulic system" discloses an unloading machine hydraulic system, which comprises an oil tank, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, a fifth reversing valve, a first hydraulic cylinder, a second hydraulic cylinder and a hydraulic cylinder. The unloading machine hydraulic system can open the warehouse door to send the goods into the warehouse while weighing, reducing the error caused by the intermediate link, saving time, and achieving the integration of taking goods, weighing and entering the warehouse; but the working pressure of each oil cylinder in the system is the same, and multiple oil cylinders cannot work at different pressures, nor does it have a pressure maintaining function.

[0004] In the gravity energy storage power generation system, the main generator is connected to the elevator equipment through a transmission shaft system, which includes a hydraulic clutch and a hydraulic brake. These devices are controlled by multiple oil cylinders for power transmission;

[0005] Since the gravity energy storage system requires high-speed vertical lifting of heavy objects weighing dozens of tons, the hydraulic clutch and the hydraulic brake need to move simultaneously and work in a certain time sequence to achieve the disconnection of the power clutch between the lifting equipment and the main generator, hydraulic braking and hydraulic brake release-closing of the clutch, and the working period of each oil cylinder is within 0.5s;

[0006] In addition, since the working pressure of the hydraulic clutch oil cylinder is usually only 0.4MPa-1.1Mpa, while the working pressure of the hydraulic brake oil cylinder reaches 10-15MPa, both oil cylinders need to work normally in the same hydraulic system, and the hydraulic system needs to accurately supply hydraulic oil of different pressure levels;

[0007] Finally, the capacity of the hydraulic clutch and the hydraulic brake is small, both within 0.5L, so the conventional flow control system will cause the oil cylinder pressure to be too high in a very short time, damaging the seal of the low-pressure oil cylinder. Therefore, a hydraulic system is needed to realize the simultaneous and independent control of multiple oil cylinders at different pressures. SUMMARY

[0008] The application aims to provide a gravity energy storage multi-stage pressure hydraulic control system, which can realize simultaneous and independent control of multiple oil cylinders under different pressures, and can accurately control the working pressure of each oil cylinder to reach the target value in a short time.

[0009] The above technical purpose of the application is achieved by the following technical scheme:

[0010] A gravity energy storage multi-stage pressure hydraulic control system comprises an oil tank, the oil tank is connected to an oil pump, the oil outlet end of the oil pump is connected to a low-pressure circuit and a high-pressure circuit,

[0011] The low-pressure circuit is connected to a first pressure reducing valve, the outlet end of the first pressure reducing valve is connected to at least two low-pressure branches, the high-pressure circuit is connected to a branch valve for controlling opening and closing, the other end of the branch valve is connected to a corresponding branch proportional pressure valve, and the branch proportional pressure valve is connected to the oil inlet of a corresponding working oil cylinder.

[0012] The oil inlet of the corresponding working oil cylinder is also connected to a throttle valve, the other end of the throttle valve is also connected to a circuit valve for controlling opening and closing, and the other end of the circuit valve is connected to the oil tank.

[0013] Further, the oil outlet end of the oil pump is connected to a one-way valve, the other end of the one-way valve is connected to a high-pressure filter, and the low-pressure circuit and the high-pressure circuit are both connected to the outlet end of the high-pressure filter.

[0014] Further, the oil outlet end of the oil pump is connected to a first branch and a second branch, the second branch is connected to the low-pressure circuit and the high-pressure circuit, and the first branch is connected to a supplementary oil switch valve for controlling opening and closing, and the other end of the supplementary oil switch valve is connected to an energy accumulator.

[0015] Further, a gas pressure sensor is installed on the energy accumulator.

[0016] Further, the oil inlets of the working oil cylinders and the oil tank are connected and controlled by unloading valves.

[0017] Further, a second overflow valve is connected between the branch proportional pressure valve in the high-pressure circuit and the oil cylinder.

[0018] Further, the circuit valve in the high-pressure circuit is connected to a return oil filter away from the throttle valve, and the oil tank is connected to the other end of the return oil filter.

[0019] Further, one end of the overflow valve is connected to the branch proportional pressure valve in the high-pressure circuit, and the other end is connected to the inlet end of the return oil filter.

[0020] Further, the outlet end of the high-pressure filter is also connected in parallel with a hand pump, and the other end of the hand pump is connected to the oil tank.

[0021] Further, the oil inlet of the working oil cylinder is also connected with a pressure sensor to monitor the working pressure at the oil inlet of the oil cylinder.

[0022] In summary, the present application has the following advantages:

[0023] 1. The present application uses the first pressure reducing valve to realize the simultaneous work of two-stage oil pressure in the system, and the working pressure of the first branch and the second branch oil cylinder can be set according to the needs, and the number of oil cylinders is not limited.

[0024] 2. In the high-pressure circuit and the low-pressure circuit, the first branch proportional pressure valve, the second branch proportional pressure valve and the third branch proportional pressure reducing valve are used for proportional fine adjustment of the working pressure, realizing accurate pressure control, and the cooperative control of devices such as clutches and brakes that require accurate control of output can be realized.

[0025] 3. Through the combination of the first circuit valve and the first throttle valve, when the first branch valve and the first branch proportional pressure valve are turned on, the first circuit valve is opened synchronously, so that the oil pressure entering the oil cylinder is further reduced by discharging oil through the first throttle valve, and the overloading of the oil cylinder is prevented.

[0026] The flow capacity of the first throttle valve can be set in advance, so that the system can quickly establish appropriate pressure during operation; similarly, the second throttle valve and the third throttle valve also have similar effects, and are respectively used for oil cylinders under different working pressures to realize accurate pressure control of different pressure levels.

[0027] 4. The hydraulic oil is directly connected back to the oil tank through the first unloading valve, which can realize rapid pressure unloading of the system and ensure that the equipment can quickly act under special circumstances.

[0028] 5. The accumulator can provide power oil for the system; when used, first connect the oil supplementing switch valve (solenoid valve), supplement the accumulator with the oil pump, and when the set working pressure is reached, the oil pump can stop working, and the accumulator provides pressure to the system. Since the present system is a pressure control system, it does not require a large amount of oil, so the use of the accumulator can save energy consumption; the gas pressure relay can detect the gas pressure in the accumulator and alarm when the gas pressure is insufficient, realizing automatic control of the entire system.

[0029] The hydraulic system designed in the present application is used to drive a transmission shaft system with multiple different working pressures.

[0030] The hydraulic system designed in this invention can achieve simultaneous and individual control of multiple cylinders under different pressures, and can precisely control the working pressure of each cylinder to achieve the target pressure value in a short time. The hydraulic system designed in this invention consists of a hydraulic pump, accumulator, hydraulic valve group, sensor, return oil circuit, etc., and is suitable for collaborative operation scenarios of multiple cylinders under different working pressures. This system has the advantages of high control accuracy, low cost, and simple control, and is particularly suitable for gravity energy storage, power generation, lifting and other fields. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structural principle of the present invention.

[0032] In the diagram, 1. Oil pump; 2. Oil tank; 3. Check valve; 4. High-pressure filter; 5. Return oil filter; 11. Accumulator; 14. First relief valve; 171. Pneumatic relay; 23. Replenishment switch valve; 29. ​​Branch pressure sensor; 261. Manual pump; 221. First pressure reducing valve; 201. First circuit valve; 202. Second circuit valve; 203. Third circuit valve; 211. First throttle valve; 212. Second throttle valve; 213. Third throttle valve; 241. First branch proportional pressure valve; 242. Second branch proportional pressure valve; 271. Third branch proportional pressure reducing valve.

[0033] 301, First pressure sensor; 302, Second pressure sensor; 303, Third pressure sensor; 321, First branch valve; 322, First unloading valve; 323, Second branch valve; 324, Second unloading valve; 325, Third branch valve; 326, Third unloading valve; 33, First low-pressure working cylinder; 34, Second low-pressure working cylinder; 35, Third high-pressure working cylinder; 311, Second relief valve. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on the present invention.

[0035] A gravity energy storage multi-stage pressure hydraulic control system, such as Figure 1 As shown, it includes an oil tank 2, which is connected to an oil pump 1. The oil outlet of the oil pump 1 is connected to a check valve 3, and the other end of the check valve 3 is connected to a high-pressure filter 4. The oil pump 1 delivers the hydraulic oil in the oil tank 2 through the check valve 3 and the high-pressure filter 4 in sequence.

[0036] The other end (outlet end) of the high-pressure filter 4 is connected with a first branch and a second branch, the first branch is connected with a refueling switch valve 23, the refueling switch valve 23 is a two-position two-way valve, the other end of the refueling switch valve 23 is connected with an accumulator 11, the accumulator 11 is provided with a gas pressure sensing device, in this embodiment, it is a gas pressure relay 171, in use, the refueling switch valve 23 is first turned on, the accumulator 11 is refueled by the oil pump 1, when the set working pressure is reached, the oil pump 1 stops working, the accumulator 11 provides pressure to the system, the gas pressure relay 171 detects the gas pressure in the accumulator, and when the gas pressure is insufficient, an alarm can be given, realizing automatic control of the entire system.

[0037] In this embodiment, the outlet end of the high-pressure filter 4 is also connected with a branch pressure sensor 29, the branch pressure sensor 29 is used to detect the pressure in the oil circuit, when the oil pump 1 refuels the accumulator 11, the system pressure is detected by the branch pressure sensor 29, when the branch pressure sensor 29 detects that the pressure rises to the working pressure, the oil pump 1 can stop.

[0038] As shown in Figure 1 , the second branch connects the low-pressure circuit and the high-pressure circuit,

[0039] Among them, the low-pressure circuit is connected with a first pressure reducing valve 221, the outlet end of the first pressure reducing valve 221 is connected with at least two low-pressure branches,

[0040] In this embodiment, the outlet end of the first pressure reducing valve 221 is connected with two low-pressure branches,

[0041] One of the low-pressure branches is connected with a first branch valve 321, the first branch valve 321 is a two-position two-way valve, the other end of the first branch valve 321 is connected with a first branch proportional pressure valve 241, the first branch proportional pressure valve 241 is connected with the oil inlet of a first low-pressure working oil cylinder 33;

[0042] The oil inlet circuit of the first low-pressure working oil cylinder 33 is also connected with a first throttle valve 211, the other end of the first throttle valve 211 is connected with a first circuit valve 201, the first circuit valve 201 is a two-position two-way valve, the other end of the first circuit valve 201 is connected to the oil tank 2;

[0043] The oil inlet circuit of the first low-pressure working oil cylinder 33 is also connected with a first pressure sensor 301 to monitor the working pressure at the oil inlet of the oil cylinder, the first low-pressure working oil cylinder 33 is a single-acting oil cylinder, provided with a restoring spring inside, connected between the oil inlet of the first low-pressure working oil cylinder 33 and the oil tank 2 through a first unloading valve 322, the first unloading valve 322 is a two-position two-way valve.

[0044] Similarly, another low-pressure branch is connected to the second branch valve 323, which is a two-position two-way valve, and the other end of the second branch valve 323 is connected to the second branch proportional pressure valve 242, which is connected to the oil inlet of the second low-pressure working oil cylinder 34.

[0045] The oil inlet circuit of the second low-pressure working oil cylinder 34 is also connected to the second throttle valve 212, and the other end of the second throttle valve 212 is connected to the second circuit valve 202, which is a two-position two-way valve, and the other end of the second circuit valve 202 is connected to the oil tank 2.

[0046] The oil inlet circuit of the second low-pressure working oil cylinder 34 is also connected to the second pressure sensor 302 to monitor the working pressure at the oil inlet of the cylinder, and the second low-pressure working oil cylinder 34 is a single-acting oil cylinder with a restoring spring inside, connected between the oil inlet of the second low-pressure working oil cylinder 34 and the oil tank 2 through the second unloading valve 324, which is a two-position two-way valve.

[0047] The high-pressure circuit is connected to the third branch valve 325, which is a two-position two-way valve, and the other end of the third branch valve 325 is connected to the third branch proportional pressure reducing valve 271, which is connected to the oil inlet of the third high-pressure working oil cylinder 35.

[0048] The oil inlet circuit of the third high-pressure working oil cylinder 35 is also connected to the third throttle valve 213, and the other end of the third throttle valve 213 is connected to the third circuit valve 203, which is a two-position two-way valve, and the other end of the third circuit valve 203 is connected to the oil return filter 5, and the other end of the oil return filter 5 is connected to the oil tank 2.

[0049] The oil inlet circuit of the third high-pressure working oil cylinder 35 is also connected to the third pressure sensor 303 to monitor the working pressure at the oil inlet of the cylinder, and the third low-pressure working oil cylinder is a single-acting oil cylinder with a restoring spring inside, connected between the oil inlet of the third low-pressure working oil cylinder and the oil tank 2 through the third unloading valve 326, which is a two-position two-way valve.

[0050] The above-mentioned pressure reducing valve used in the system has no special requirements, and in this embodiment, an electromagnetic proportional pressure reducing valve is used, which can reduce the working pressure of 20 MPa to 0.5 MPa, and is convenient for automatic control, and the oil return ports are all overflowed to the oil tank.

[0051] The second overflow valve 311 is connected to the oil return port of the third branch proportional pressure reducing valve 271, and the other end of the second overflow valve 311 is connected to the inlet end of the oil return filter 5; the second overflow valve 311 is used for safety protection, when the hydraulic pressure of the main oil circuit is too high, the second overflow valve 311 is turned on, making the oil flow back to the oil tank, and the system pressure no longer rises;

[0052] In the embodiment, the oil outlet end of the oil pump 1 is also connected to the first overflow valve 14, and the other end of the first overflow valve 14 is connected to the oil tank 2, for protecting the system pressure; when the hydraulic cylinder is deadlocked, the pressure rises to the opening pressure of the first overflow valve 14, the first overflow valve 14 is turned on, and the hydraulic oil flows back to the oil tank from the first overflow valve 14, so that the system pressure no longer rises.

[0053] The outlet end of the high-pressure filter 4 can also be connected in parallel with a manual pump 261, and the other end of the manual pump 261 is connected to the oil tank 2, which can be controlled by a one-way valve or an electromagnetic valve to control the flow direction or opening and closing, for driving the oil pump manually to pressurize the hydraulic system when the system is maintained or the oil pump fails, so as to realize the movement of the oil cylinder and maintenance.

[0054] In the embodiment, the two-stage oil pressure in the system works through the first pressure reducing valve 221, the working pressure of the two low-pressure branches can be set according to the needs, and the working pressure of the two low-pressure branches does not affect each other, and the number of oil cylinders is not limited; in the two low-pressure branches and another high-pressure circuit, the proportional fine adjustment of the working pressure is realized through the first branch proportional pressure valve 241, the second branch proportional pressure valve 242 and the third branch proportional pressure reducing valve 271, so as to realize the precise control of the pressure.

[0055] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and the modification or equivalent replacement should also be regarded as falling within the protection scope of the technical scheme of the present application.

Claims

1. A gravity-based multi-stage pressure hydraulic control system, comprising an oil tank connected to an oil pump, characterized in that: The oil pump's outlet is connected to both the low-pressure and high-pressure circuits. The low-pressure circuit is connected to the first pressure reducing valve, the outlet end of the first pressure reducing valve is connected to at least two low-pressure branches, the high-pressure circuit and each low-pressure branch are connected to a branch valve for controlling opening and closing, the other end of the branch valve is connected to the corresponding branch proportional pressure valve, and the branch proportional pressure valve is connected to the oil inlet of the corresponding working cylinder. The oil inlet of the corresponding working cylinder is also connected to a throttle valve, and the other end of the throttle valve is connected to a circuit valve for controlling opening and closing, and the other end of the circuit valve is connected to the oil tank. The oil pump's outlet end is connected to a check valve, and the other end of the check valve is connected to a high-pressure filter. Both the low-pressure circuit and the high-pressure circuit are connected to the outlet end of the high-pressure filter. The oil pump's outlet end is connected to a first branch and a second branch. The second branch is connected to the low-pressure circuit and the high-pressure circuit. The first branch is connected to a replenishing oil switch valve for controlling the opening and closing of the circuit. The other end of the replenishing oil switch valve is connected to an accumulator.

2. The gravity energy storage multi-stage pressure hydraulic control system according to claim 1, characterized in that: A gas pressure sensor is installed on the accumulator.

3. The gravity energy storage multi-stage pressure hydraulic control system according to claim 1, characterized in that: The oil inlet of each working cylinder and the oil tank are connected and controlled by an unloading valve.

4. A gravity energy storage multi-stage pressure hydraulic control system according to claim 1 or 3, characterized in that: A second relief valve is connected between the branch proportional pressure valve and the oil cylinder in the high-pressure circuit.

5. A gravity energy storage multi-stage pressure hydraulic control system according to claim 4, characterized in that: In the high-pressure circuit, the end of the return valve furthest from the throttle valve is connected to the return oil filter, and the oil tank is connected to the other end of the return oil filter.

6. A gravity energy storage multi-stage pressure hydraulic control system according to claim 5, characterized in that: One end of the overflow valve is connected to the branch proportional pressure valve in the high-pressure circuit, and the other end is connected to the inlet end of the return oil filter.

7. The gravity energy storage multi-stage pressure hydraulic control system according to claim 1, characterized in that: A manual pump is also connected in parallel at the outlet of the high-pressure filter, and the other end of the manual pump is connected to the oil tank.

8. The gravity energy storage multi-stage pressure hydraulic control system according to claim 1, characterized in that: The oil inlet of the working cylinder is also connected to a pressure sensor to monitor the working pressure at the oil inlet of the cylinder.

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