CN115111209A - A high-energy-efficiency accumulator with integrated telescopic device, hydraulic system and control method - Google Patents

Abstract

The invention discloses a high-energy-efficiency accumulator integrated with a telescopic device, a hydraulic system and a control method, comprising an accumulator cylinder and a telescopic device. The accumulator cylinder is a sealed structure with a hollow inside. The inner cavity is divided into an oil storage cavity and an air storage cavity by the accumulator piston. The upper end of the accumulator cylinder is provided with an oil port, and the oil port is communicated with the oil storage cavity of the accumulator cylinder. The lower end of the accumulator cylinder There is an inflating port, the inflating port is communicated with the air storage cavity of the accumulator cylinder, the expansion device is integrated in the air storage cavity of the accumulator cylinder, and the lower end of the expansion device is fixedly connected with the bottom wall of the accumulator cylinder, The upper end of the telescopic device is fixedly connected with the accumulator piston, which has the advantages of high energy utilization rate, energy saving and environmental protection, small volume and weight, and high integration. The hydraulic system and control system have the advantages of simple operation process.

Description

A high-energy-efficiency accumulator with integrated telescopic device, hydraulic system and control method

technical field

The present invention relates to the technical field of hydraulic accumulators, and more specifically, the present invention relates to a high-energy-efficiency accumulator integrated with a telescopic device, a hydraulic system and a control method.

Background technique

As an auxiliary component of the hydraulic system, the piston accumulator is used to store and release the pressure energy in the hydraulic system. One of its chambers is high-pressure gas, and the other chamber is hydraulic oil. The middle is sealed by a piston-type structure to prevent oil and gas. mix. Its basic operating principle is: when the pressure of the hydraulic system is higher than the pressure of the oil cavity in the accumulator, the oil of the hydraulic system is charged into the oil cavity of the accumulator, compressing the air cavity, so that the pressure of the two cavities of oil and gas increases gradually. Until the pressure inside and outside the accumulator is equal; on the contrary, when the pressure of the hydraulic system is lower than the pressure of the oil chamber in the accumulator, the liquid in the oil chamber will be released into the system, and the air chamber will increase, so that the pressure of the oil and gas chambers is gradually reduced. Until the pressure inside and outside the accumulator is equal.

Because the volume of liquid that the accumulator can release is related to the initial pressure and the final pressure, the higher the initial pressure and the lower the final pressure, the more oil can be released; conversely, the lower the initial pressure and the higher the final pressure, the more oil can be released. less oil.

The problem of this kind of accumulator is as follows: in order to push the load to do work, the hydraulic system must establish a certain pressure, so it is difficult to completely release the oil in the oil chamber of the accumulator, and there must be residuals. As a result, the volume of the accumulator oil cavity must be much larger than the actual required oil volume during the calculation and selection, resulting in a larger volume of the accumulator and an increase in the volume weight of the accumulator; the final pressure of pushing the load to do work cannot be reduced. , In order to release more oil, generally can only rely on the method of increasing the initial pre-charge pressure, high pressure will lead to the increase of the pressure resistance level of the entire hydraulic system, the system safety requirements will be higher, and the overall quality will increase.

SUMMARY OF THE INVENTION

In order to solve the technical problems that the oil of the existing piston accumulator cannot be completely released, resulting in a large volume and weight of the hydraulic system, and an increase in the pressure resistance level, the present invention innovatively provides a high-efficiency accumulator integrated with a telescopic device. The expansion device is integrated into the air storage cavity of the accumulator, and the expansion device is used to release or store more oil in the accumulator, which has the advantages of high energy utilization rate, energy saving and environmental protection, small volume and weight, simple operation process and high integration. The advantages.

In order to achieve the above technical purpose, the embodiment of the present invention discloses a high-efficiency accumulator integrated with a telescopic device, including an accumulator cylinder and a telescopic device. The inner cavity of the accumulator cylinder is divided into an oil storage cavity and an air storage cavity by the accumulator piston. The oil cavity is connected, the lower end of the accumulator cylinder is provided with an inflating port, the inflating port is communicated with the air storage cavity of the accumulator cylinder, and the expansion device is integrated in the air storage cavity of the accumulator cylinder The lower end of the expansion device is fixedly connected with the bottom wall of the accumulator cylinder, and the upper end of the expansion device is fixedly connected with the accumulator piston.

Further, the present invention is a high-efficiency accumulator integrated with a telescopic device, wherein the telescopic device is arranged along the axis direction of the accumulator cylinder, and when the telescopic device is fully extended, the oil storage of the accumulator cylinder is The volume of the cavity is the smallest and the volume of the air storage cavity is the largest. When the expansion device is fully retracted, the volume of the oil storage cavity of the accumulator cylinder is the largest and the volume of the air storage cavity is the smallest.

Further, the present invention provides a high-efficiency accumulator integrated with a telescopic device, wherein the telescopic device is an electric cylinder, and the cable of the electric cylinder is connected to an external power source through a cable interface provided at the lower end of the accumulator cylinder.

Further, the present invention is a high-efficiency accumulator integrated with a telescopic device, wherein the telescopic device is an electric cylinder, the cylinder of the electric cylinder is located in the accumulator cylinder, and the bottom wall of the cylinder of the electric cylinder is connected to the body of the accumulator. The bottom wall of the accumulator cylinder is integrally formed, and the push-pull rod of the electric cylinder is connected with the accumulator piston.

The embodiment of the present invention further discloses a hydraulic system, including the above-mentioned high-efficiency accumulator integrated with a telescopic device, the hydraulic system further includes an oil tank, a driving motor, a hydraulic pump, a reversing valve and a hydraulic cylinder, the The drive motor is connected to the hydraulic pump, the oil inlet of the hydraulic pump is connected to the oil tank, the reversing valve is a three-position four-way flow directional valve, and the P port of the reversing valve is connected to the oil outlet of the hydraulic pump Then, the port A of the reversing valve is connected with the rodless cavity of the hydraulic cylinder, and the rodless cavity of the hydraulic cylinder is connected with the oil port of the accumulator cylinder through the first switch valve, and the The B port is connected with the rod cavity of the hydraulic cylinder, and the T port of the reversing valve is connected with the oil tank through the second switch valve.

Further, a hydraulic system of the present invention further comprises a relief valve, the oil inlet of the relief valve is respectively connected with the oil outlet of the hydraulic pump and the P port of the reversing valve, the discharge port of the relief valve is The oil port is connected to the oil tank.

Further, the present invention provides a hydraulic system, wherein the first switch valve is a power-off normally-closed type two-position two-way electromagnetic switch valve.

Further, the present invention provides a hydraulic system, wherein the second switch valve is a power-off normally open type two-position two-way electromagnetic switch valve.

The embodiment of the present invention also discloses the above-mentioned control method of a hydraulic system, the control method includes a hydraulic cylinder extending step and a hydraulic cylinder retracting step:

The step of extending the hydraulic cylinder includes:

Start the drive motor and hydraulic pump, and the hydraulic pump builds up pressure;

The electromagnetic coil S1 of the first switch valve is energized, so that the first switch valve is turned on, and the oil in the accumulator oil storage chamber is released to the rodless chamber of the hydraulic cylinder;

The solenoid coil S2 of the reversing valve is energized, so that the P port of the reversing valve is connected to the A port and the T port is connected to the B port, so that the oil pumped by the hydraulic pump flows into the rodless cavity of the hydraulic cylinder, and at the same time makes the The oil in the rod cavity of the hydraulic cylinder flows back to the oil tank;

When the pressure of the oil storage chamber of the accumulator barrel is reduced to the pressure of the rodless chamber of the hydraulic cylinder, start the electric cylinder to push the accumulator piston to move upward and continue to supply oil into the rodless chamber of the hydraulic cylinder;

When the hydraulic cylinder is extended in place, the first switch valve and the reversing valve are de-energized and the drive motor, hydraulic pump and electric cylinder are turned off;

The hydraulic cylinder retracting step includes:

Start the drive motor and hydraulic pump, and the hydraulic pump builds up pressure;

The electromagnetic coil S1 of the first on-off valve is energized, so that the first on-off valve is turned on;

The electromagnetic coil S4 of the second on-off valve is energized, so that the second on-off valve is disconnected;

The solenoid coil S3 of the reversing valve is energized, so that the P port of the reversing valve is connected to the B port and the T port is connected to the A port, and the oil pumped by the hydraulic pump flows into the rod cavity of the hydraulic cylinder; The T port of the valve is connected to the A port, and the oil in the rodless cavity of the hydraulic cylinder flows into the oil storage cavity of the accumulator cylinder;

When the pressure of the oil storage chamber of the accumulator cylinder rises to the pressure of the rodless chamber of the hydraulic cylinder, start the electric cylinder to pull the accumulator piston to move down, and the oil in the rodless chamber of the hydraulic cylinder continues to flow into the accumulator cylinder the oil storage chamber;

When the hydraulic cylinder is retracted in place, the first switch valve, the second switch valve and the reversing valve are de-energized, and the driving motor, the hydraulic pump and the electric cylinder are turned off.

Further, the present invention provides a control method for a hydraulic system, wherein in the step of extending the hydraulic cylinder, before the pressure of the oil storage chamber of the accumulator cylinder is reduced to the pressure of the rodless chamber of the hydraulic cylinder, the electric cylinder is in a follow-up state. state; in the step of retracting the hydraulic cylinder, before the pressure of the oil storage chamber of the accumulator cylinder rises to the pressure of the rodless chamber of the hydraulic cylinder, the electric cylinder is in a follow-up state.

The beneficial effects of the present invention are: the expansion device can completely release the oil in the oil storage cavity of the accumulator, and only the oil storage cavity of the accumulator needs to be slightly larger than the rodless cavity of the hydraulic cylinder to be acted upon, so that The volume and weight of the accumulator can be reduced; compared with the traditional accumulator, it releases more oil, which can reduce the flow and power provided by the pump source, which is more energy-saving and environmentally friendly; When the pressure of the oil storage chamber reaches the load pressure, the expansion device can further push the accumulator piston to release more oil to reduce the pressure resistance level of the hydraulic system; during the energy storage process, when the pressure of the oil storage chamber of the accumulator When the load pressure is reached, the piston of the accumulator can be further pulled by the expansion device to store more oil, eliminating the oil filling process of the traditional accumulator; the expansion device and the air storage chamber of the accumulator share the same installation space, making the overall structure of the device more compact and more integrated.

Description of drawings

FIG. 1 is a schematic structural diagram of a high-efficiency accumulator integrated with a telescopic device of the present invention;

FIG. 2 is another schematic structural diagram of a high-efficiency energy accumulator integrated with a telescopic device according to the present invention.

Detailed ways

A high-efficiency energy accumulator integrated with a telescopic device of the present invention will be explained and described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , an embodiment of the present invention discloses a high-efficiency accumulator integrated with a telescopic device, which specifically includes an accumulator cylinder 1 and a telescopic device, wherein the accumulator cylinder 1 is a sealed structure with a hollow interior , so that the inner cavity of the accumulator cylinder 1 is divided into an oil storage chamber 3 and an air storage chamber 4 by the accumulator piston 2, and an oil port 5 is provided on the upper end of the accumulator cylinder 1, so that the oil port 5 is connected with the storage chamber 4. The oil storage cavity 3 of the accumulator cylinder 1 is communicated, and an inflation port 6 is provided at the lower end of the accumulator cylinder 1, so that the inflatable port 6 is communicated with the air storage cavity 4 of the accumulator cylinder 1, and the telescopic device is integrated in the In the air storage chamber 4 of the accumulator cylinder 1 , the lower end of the expansion device is fixedly connected to the bottom wall of the accumulator cylinder 1 , and the upper end of the expansion device is fixedly connected to the accumulator piston 2 .

Through the above arrangement, the telescopic device can completely release the oil in the accumulator oil storage chamber 3, and only the oil storage chamber 3 of the accumulator needs to be slightly larger than the rodless chamber of the acting hydraulic cylinder (both The volume and weight of the accumulator can be reduced; compared with the traditional accumulator, it releases more oil, which can reduce the flow and power provided by the pump source, and is more energy-saving and environmentally friendly; During the energy release process, when the pressure of the oil storage chamber 3 of the accumulator reaches the load pressure, the accumulator piston can be further pushed through the expansion device to release more oil, thereby reducing the pressure resistance level of the hydraulic system; during the energy storage process When the pressure of the oil storage chamber 3 of the accumulator reaches the load pressure, the accumulator piston can be further pulled by the telescopic device to store more oil, eliminating the traditional accumulator refilling process; The device shares the same installation space with the gas storage chamber 4 of the accumulator, which makes the overall structure of the device more compact and the degree of integration higher.

In an embodiment of the present invention, the telescopic device is arranged along the axis direction of the accumulator cylinder 1. When the telescopic device is fully extended, the volume of the oil storage chamber 3 of the accumulator cylinder 1 is minimized, and the volume of the gas storage chamber 4 is minimized. Maximum, when the expansion device is fully retracted, the volume of the oil storage chamber 3 of the accumulator cylinder 1 is the largest, and the volume of the air storage chamber 4 is the smallest. When the accumulator releases energy, more oil can be released. When storing energy, it can store more oil, which is more in line with the operating habits, the movement is smoother, the misoperation is prevented, and the running stability is improved.

The telescopic device can use an electric cylinder 7, and the cable of the electric cylinder 7 is connected to the external power supply through the cable interface 8 provided at the lower end of the accumulator cylinder 1, which enhances the electrical operability and improves the automation level.

As shown in FIG. 2 , the electric cylinder 7 that can be used by the telescopic device is a planetary ball screw electric cylinder. The bottom wall of the body 1 is integrally formed, the push-pull rod of the electric cylinder 7 is connected to the accumulator piston 2, and the motor of the electric cylinder 7 is located outside the accumulator cylinder 1. While ensuring the overall reliability of the structure, the accumulator cylinder is 1 and the electric cylinder 7 are organically combined. Under the same working conditions, the overall capacity and volume of the accumulator can be further reduced compared to the traditional accumulator, and the cable interface 8 can be omitted at the same time, and the sealing of the accumulator cylinder 1 can be improved. Effect.

The embodiment of the present invention also discloses a hydraulic system, which applies the above-mentioned high-energy-efficiency accumulator integrated with a telescopic device. Specifically, the hydraulic system further includes an oil tank 9 , a driving motor 10 , a hydraulic pump 11 , a reversing valve 12 and a hydraulic cylinder 13 . The drive motor 10 is connected with the hydraulic pump 11, the oil inlet of the hydraulic pump 11 is connected with the oil tank 9, the reversing valve 12 is a three-position four-way flow direction valve, and the P port of the reversing valve 12 is connected with the oil outlet of the hydraulic pump 11. The port A of the reversing valve 12 is connected to the rodless cavity of the hydraulic cylinder 13, and the rodless cavity of the hydraulic cylinder 13 is connected to the oil port 5 of the accumulator cylinder 1 through the first switch valve 14. The switch valve 14 controls the connection between the accumulator and the rodless cavity of the hydraulic cylinder 13 , the B port of the reversing valve 12 is connected to the rod cavity of the hydraulic cylinder 13 , and the T port of the reversing valve 12 is connected to the fuel tank through the second switching valve 15 . 9 is connected, when the reversing valve 12 is de-energized, it remains in the neutral position, so that the hydraulic pump 11 and the hydraulic cylinder 13 are not connected.

The hydraulic system in this embodiment also includes a relief valve 16. The oil inlet of the relief valve 16 is connected to the oil outlet of the hydraulic pump 11 and the P port of the reversing valve 12 respectively. The oil outlet of the relief valve 16 is connected to the oil outlet of the hydraulic pump 11 and the P port of the reversing valve 12 respectively The oil tank 9 is connected, and the relief valve 16 is used to set the maximum pressure of the entire hydraulic system.

The first switch valve 14 is preferably a power-off normally closed two-position two-way electromagnetic switch valve, that is, when the power is off, the first switch valve 14 is in a closed state, and the pipeline does not form a passage, so as to ensure that the energy of the accumulator is not in the energy storage state. lost.

The second on-off valve 15 is preferably a two-position, two-way electromagnetic on-off valve of a power-off normally open type, that is, when the power is off, the second on-off valve 15 is in a conducting state, and the pipeline forms a passage. The second switch valve 15 is in a conducting state during the extension process of the hydraulic cylinder 13, and the oil in the rod cavity of the hydraulic cylinder 13 can be returned to the oil tank 9; the second switch valve 15 is in a closed state during the retraction process of the hydraulic cylinder 13 state, the oil in the rodless cavity of the hydraulic cylinder 13 is urged to flow into the oil storage cavity 3 of the accumulator cylinder 1 .

In the hydraulic system of this embodiment, the accumulator and the hydraulic pump 11 simultaneously supply oil to the rodless cavity to increase the operating speed. Under the action of the electric cylinder 7, the accumulator can release or store more oil, which improves the utilization rate of the oil. The oil supplied or recovered by the hydraulic pump 11 is reduced, the flow rate and power of the hydraulic pump 11 are reduced, the burden of the hydraulic pump 11 is reduced, and there is no need to increase the pressure level of the hydraulic system when the accumulator is added. Both the volume and weight of the accumulator and hydraulic pump 11 can be reduced. The hydraulic system in this embodiment is simple in structure, compact and highly integrated, and can be applied to a device with a narrow space or a high integration degree to achieve the purpose of reducing the volume.

The embodiment of the present invention also discloses the control method of the above-mentioned hydraulic system, the realization principle and technical effect of which are similar to those of the hydraulic system, and are not repeated here. The same is true for the following embodiments, which will not be further described.

As an optional embodiment, the control method includes the step of extending the hydraulic cylinder 13 and the step of retracting the hydraulic cylinder 13:

The step of extending the hydraulic cylinder 13 includes:

Start the drive motor 10 and the hydraulic pump 11, and the hydraulic pump 11 builds up pressure;

The electromagnetic coil S1 of the first switch valve 14 is energized, so that the first switch valve 14 is turned on, and the oil in the accumulator oil storage chamber 3 is released to the rodless chamber of the hydraulic cylinder 13;

The electromagnetic coil S2 of the reversing valve 12 is energized, so that the P port of the reversing valve 12 is connected to the A port and the T port is connected to the B port, so that the oil pumped by the hydraulic pump 11 flows into the rodless cylinder of the hydraulic cylinder 13. At the same time, the oil in the rod cavity of the hydraulic cylinder 13 flows back to the oil tank 9;

When the pressure of the oil storage cavity 3 of the accumulator cylinder 1 is reduced to the pressure of the rodless cavity of the hydraulic cylinder 13, the electric cylinder 7 is activated to push the accumulator piston 2 to move upward and continue to supply oil into the rodless cavity of the hydraulic cylinder 13. liquid;

When the hydraulic cylinder 13 is extended in place, the first switch valve 14 and the reversing valve 12 are de-energized and the drive motor 10, the hydraulic pump 11 and the electric cylinder 7 are turned off;

The step of retracting the hydraulic cylinder 13 includes:

Start the drive motor 10 and the hydraulic pump 11, and the hydraulic pump 11 builds up pressure;

The electromagnetic coil S1 of the first switch valve 14 is energized, so that the first switch valve 14 is turned on;

The electromagnetic coil S4 of the second switch valve 15 is energized, so that the second switch valve 15 is disconnected;

The electromagnetic coil S3 of the reversing valve 12 is energized, so that the P port of the reversing valve 12 is connected to the B port and the T port is connected to the A port, so that the oil pumped by the hydraulic pump 11 flows into the rod of the hydraulic cylinder 13. At the same time, the oil in the rodless cavity of the hydraulic cylinder 13 flows into the oil storage cavity 3 of the accumulator cylinder 1;

When the pressure of the oil storage chamber 3 of the accumulator cylinder 1 rises to the pressure of the rodless chamber of the hydraulic cylinder 13, the electric cylinder 7 is activated to pull the accumulator piston 2 to move downward, and the oil in the rodless chamber of the hydraulic cylinder 13 continues into the oil storage chamber 3 of the accumulator cylinder 1;

When the hydraulic cylinder 13 is retracted in place, the first switch valve 14 , the second switch valve 15 and the reversing valve 12 are de-energized, and the drive motor 10 , the hydraulic pump 11 and the electric cylinder 7 are turned off.

In the step of extending the hydraulic cylinder 13, before the pressure of the oil storage chamber 3 of the accumulator cylinder 1 is reduced to the pressure of the rodless chamber of the hydraulic cylinder 13, the electric cylinder 7 is in a follow-up state; in the step of retracting the hydraulic cylinder 13, when Before the pressure of the oil storage chamber 3 of the accumulator cylinder 1 rises to the pressure of the rodless chamber of the hydraulic cylinder 13, the electric cylinder 7 is in a follow-up state to avoid generating useless work and affecting the stability of the system.

In the description of the present 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, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and simple improvements made in the essence of the present invention should be included in the protection scope of the present invention. Inside.

Claims (10)

1. The utility model provides an energy-efficient energy storage ware of integrated telescoping device which characterized in that: including energy storage barrel (1) and telescoping device, energy storage barrel (1) is inside hollow seal structure, the inner chamber of energy storage barrel (1) passes through energy storage piston (2) to be separated for oil storage chamber (3) and gas storage chamber (4), the upper end of energy storage barrel (1) is equipped with oil port (5), oil port (5) and oil storage chamber (3) the intercommunication of energy storage barrel (1), the lower extreme of energy storage barrel (1) is equipped with inflation inlet (6), inflation inlet (6) and gas storage chamber (4) the intercommunication of energy storage barrel (1), the telescoping device is integrated in gas storage chamber (4) of energy storage barrel (1), the lower extreme of telescoping device and the diapire fixed connection of energy storage barrel (1), the upper end and the energy storage piston (2) fixed connection of telescoping device.

2. The energy efficient accumulator integrated with a telescopic device according to claim 1, wherein: the telescopic device sets up along the axis direction of energy storage barrel (1), works as the oil storage chamber (3) volume of energy storage barrel (1) is minimum when the telescopic device stretches out completely, and gas storage chamber (4) volume is the biggest, works as the oil storage chamber (3) volume of energy storage barrel (1) is the biggest when the telescopic device withdraws completely, gas storage chamber (4) volume is the minimum.

3. The energy efficient accumulator integrated with a telescopic device according to claim 2, wherein: the telescopic device is an electric cylinder (7), and a cable of the electric cylinder (7) is connected with an external power supply through a cable interface (8) arranged at the lower end of the energy accumulator cylinder (1).

4. The energy efficient accumulator integrated with a telescopic device according to claim 2, wherein: the telescopic device is an electric cylinder (7), a cylinder barrel of the electric cylinder (7) is positioned in the energy accumulator cylinder body (1), the bottom wall of the cylinder barrel of the electric cylinder (7) and the bottom wall of the energy accumulator cylinder body (1) are integrally formed, and a push-pull rod of the electric cylinder (7) is connected with the energy accumulator piston (2).

5. A hydraulic system, characterized by: an energy efficient accumulator comprising an integrated telescopic device according to any one of claims 3 to 4, the hydraulic system also comprises an oil tank (9), a driving motor (10), a hydraulic pump (11), a reversing valve (12) and a hydraulic cylinder (13), the driving motor (10) is connected with a hydraulic pump (11), an oil inlet of the hydraulic pump (11) is connected with an oil tank (9), the reversing valve (12) is a three-position four-way flow direction valve, a P port of the reversing valve (12) is connected with an oil outlet of the hydraulic pump (11), the port A of the reversing valve (12) is connected with a rodless cavity of the hydraulic cylinder (13), a rodless cavity of the hydraulic cylinder (13) is connected with an oil port (5) of the energy accumulator cylinder body (1) through a first switch valve (14), the port B of the reversing valve (12) is connected with a rod cavity of the hydraulic cylinder (13), and a T port of the reversing valve (12) is connected with the oil tank (9) through a second switch valve (15).

6. A hydraulic system according to claim 5, wherein: the hydraulic control system is characterized by further comprising an overflow valve (16), an oil inlet of the overflow valve (16) is connected with an oil outlet of the hydraulic pump (11) and a P port of the reversing valve (12) respectively, and an oil discharge port of the overflow valve (16) is connected with the oil tank (9).

7. A hydraulic system according to claim 6, wherein: the first switch valve (14) is a power-off normally-closed two-position two-way electromagnetic switch valve.

8. A hydraulic system according to claim 7, wherein: the second switch valve (15) is a power-off normally-open two-position two-way electromagnetic switch valve.

9. A control method of a hydraulic system according to claim 8, characterized in that the control method comprises a hydraulic cylinder (13) extension step and a hydraulic cylinder (13) retraction step:

the hydraulic cylinder (13) extending step includes:

starting a driving motor (10) and a hydraulic pump (11), and building pressure for the hydraulic pump (11);

energizing an electromagnetic coil S1 of the first switch valve (14) to enable the first switch valve (14) to be conducted, and releasing oil in the accumulator oil storage chamber (3) to a rodless chamber of the hydraulic cylinder (13);

energizing an electromagnetic coil S2 of the reversing valve (12) to enable a port P of the reversing valve (12) to be communicated with a port A and a port T of the reversing valve (12) to be communicated with a port B, enabling oil pumped by the hydraulic pump (11) to flow into a rodless cavity of the hydraulic cylinder (13), and enabling the oil in a rod cavity of the hydraulic cylinder (13) to flow back to the oil tank (9);

when the pressure of an oil storage cavity (3) of the energy accumulator cylinder body (1) is reduced to the pressure of a rodless cavity of the hydraulic cylinder (13), starting the electric cylinder (7) to push the energy accumulator piston (2) to move upwards to continuously supply oil to the rodless cavity of the hydraulic cylinder (13);

when the hydraulic cylinder (13) extends to the right position, the first switch valve (14) and the reversing valve (12) are powered off, and the driving motor (10), the hydraulic pump (11) and the electric cylinder (7) are closed;

the hydraulic cylinder (13) retracting step comprises:

starting a driving motor (10) and a hydraulic pump (11), and building pressure for the hydraulic pump (11);

energizing a solenoid S1 of the first on-off valve (14) so that the first on-off valve (14) is turned on;

energizing solenoid coil S4 of second switching valve (15) so that second switching valve (15) is turned off;

energizing an electromagnetic coil S3 of the reversing valve (12) to enable a port P and a port B of the reversing valve (12) to be communicated and a port T and a port A to be communicated, so that oil pumped by the hydraulic pump (11) flows into a rod cavity of the hydraulic cylinder (13); simultaneously, oil in the rodless cavity of the hydraulic cylinder (13) flows into an oil storage cavity (3) of the energy accumulator cylinder body (1);

when the pressure of an oil storage cavity (3) of the energy accumulator cylinder body (1) is increased to the pressure of a rodless cavity of the hydraulic cylinder (13), the electric cylinder (7) is started to pull the energy accumulator piston (2) to move downwards, and oil liquid in the rodless cavity of the hydraulic cylinder (13) continuously flows into the oil storage cavity (3) of the energy accumulator cylinder body (1);

and when the hydraulic cylinder (13) is retracted to the proper position, the first switch valve (14), the second switch valve (15) and the reversing valve (12) are powered off, and the driving motor (10), the hydraulic pump (11) and the electric cylinder (7) are closed.

10. The control method of a hydraulic system according to claim 9, characterized in that: in the step of extending the hydraulic cylinder (13), before the pressure of an oil storage cavity (3) of the energy accumulator cylinder body (1) is reduced to the pressure of a rodless cavity of the hydraulic cylinder (13), the electric cylinder (7) is in a follow-up state; in the step of withdrawing the hydraulic cylinder (13), before the pressure of the oil storage cavity (3) of the energy accumulator cylinder body (1) is increased to the pressure of the rodless cavity of the hydraulic cylinder (13), the electric cylinder (7) is in a follow-up state.

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