Energy storage and release oil circuit system

Abstract

The invention discloses an energy storage and energy discharge oil circuit system, comprising a motor pump group, an accumulator group, an actuator and an oil tank connected to the motor pump group; the motor pump group is connected to the accumulator group to store energy for the accumulator group; the accumulator group is connected to the actuator to supply energy for the actuator; the motor pump group is connected to the actuator to supply energy for the actuator; compared with the prior art, when the accumulator group starts to store energy, the energy storage control valve group connects the oil circuit between the motor pump group and the accumulator group, and the energy discharge control valve group disconnects the oil circuit between the accumulator group and the actuator, so as to avoid interference of the energy discharge oil circuit with the energy storage oil circuit during energy storage; when the accumulator group starts to discharge energy, the energy discharge control valve group connects the oil circuit between the accumulator group and the actuator to supply oil to the actuator in one direction, and the oil circuit between the motor pump group and the accumulator group can also supply energy to the actuator in one direction, so as to reduce the pressure drop of the accumulator oil supply process on the one hand, and provide pressurized oil through the motor pump group on the other hand when the accumulator pressure is lower than the load.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to an energy storage and release oil circuit system. Background Art

[0002] High-pressure casting generally refers to a casting process in which liquid or semi-solid metal is injected into the mold cavity at high pressure and speed, and the liquid or semi-solid metal is solidified and formed by cooling under pressure. The mold used for high-pressure casting is often arranged with a core. The die-casting machine for high-pressure casting needs to be equipped with a core-pulling mechanism and a core-pulling cylinder to perform core-pulling operations on the core. When performing high-pressure casting operations, due to the poor working conditions of the core-pulling cylinder during the production process, the oil in the core-pulling cylinder is easily dirty, affecting the core-pulling speed of the die-casting machine and the quality of the die-casting products. Therefore, large-scale die-casting machines generally use an independent oil system to supply energy to the core-pulling mechanism. When the core-pulling mechanism performs core-pulling operations, it is necessary to store energy in the accumulator in the independent oil system in advance, and then provide high-pressure oil to the core-pulling mechanism through the accumulator in the independent oil system to help the core-pulling mechanism perform core-pulling operations. In actual working process, sometimes the core pulling mechanism includes multiple core pulling cylinders. Since the pressure of the accumulator is continuously reduced during the oil supply process, and the core pulling cylinder is affected by the product holding force when starting, the starting force is large. The starting pressure required by the core pulling cylinder to be started later is greater than the accumulator pressure, resulting in slow acceleration or failure to start the core pulling cylinder, which in turn slows down the production rhythm of the whole machine and affects production efficiency. Therefore, an oil circuit system is needed in which the energy storage and energy supply processes of the accumulator do not affect each other and can assist the accumulator in providing oil for the core pulling mechanism. Utility Model Content

[0003] The utility model aims to overcome the defects in the prior art and provides an energy storage and energy release oil circuit system in which the energy storage and energy supply processes of the accumulator do not affect each other and can assist the accumulator in providing oil for the core pulling mechanism.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme: an energy storage and release oil circuit system, including a motor pump group, an accumulator group, an actuator and an oil tank connected to the motor pump group; the motor pump group is connected to the accumulator group to store energy for the accumulator group; the accumulator group is connected to the actuator to supply energy to the actuator; the motor pump group is connected to the actuator to supply energy to the actuator.

[0005] As a preferred solution of the utility model, the accumulator group includes an accumulator, an accumulator pressure sensor and an oil drain valve; the accumulator is connected to the accumulator pressure sensor and the oil drain valve respectively.

[0006] As a preferred solution of the utility model, an energy storage control valve group is connected between the motor pump group and the accumulator group, and the energy storage control valve group includes a first cartridge valve, a first pilot reversing valve and a shuttle valve; the first cartridge valve is connected to the first pilot reversing valve through a first control branch, the first pilot reversing valve is connected to the shuttle valve through a second control branch, the shuttle valve is connected to the first pilot reversing valve through a third control branch, and the shuttle valve is connected to the third oil circuit through a fourth control branch.

[0007] As a preferred solution of the utility model, an energy release control valve group is connected between the accumulator group and the actuator, and the energy release control valve group includes a second cartridge valve and a second pilot reversing valve; the second cartridge valve is connected to the second pilot reversing valve through a fifth control branch, the second pilot reversing valve is connected to the third oil circuit through a sixth control branch, and is connected to the oil tank through a seventh control branch.

[0008] As a preferred solution of the utility model, it also includes a pump port stop valve, which is arranged at the connection between the first oil circuit, the second oil circuit and the seventh oil circuit.

[0009] As a preferred solution of the utility model, it also includes an energy release one-way valve, and the energy release one-way valve is arranged between the fifth oil circuit and the sixth oil circuit.

[0010] As a preferred solution of the utility model, a branch oil circuit is formed on the first oil circuit, and an overflow valve is arranged on the branch oil circuit.

[0011] As a preferred solution of the utility model, the accumulator pressure sensor is electrically connected to the first pilot reversing valve.

[0012] As a preferred solution of the utility model, the oil drain valve, the first pilot reversing valve and the overflow valve are all connected to the oil tank.

[0013] As a preferred solution of the utility model, the first pilot reversing valve and the second pilot reversing valve are two-position four-way solenoid valves.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. When the accumulator group starts to store energy, the oil circuit between the motor pump group and the accumulator group is connected through the energy storage control valve group, and at the same time, the energy discharge control valve group disconnects the oil circuit between the accumulator group and the actuator, so that when storing energy, the energy discharge oil circuit does not interfere with the energy storage oil circuit, thereby improving the energy storage efficiency;

[0016] 2. When the accumulator group starts to discharge energy, the high-pressure oil in the accumulator reaches the actuator through the discharge control valve group and the discharge check valve to supply energy to the actuator; at the same time, the motor pump group is connected to the accumulator group and the actuator through the oil circuit. When the actuator contains multiple core-pulling cylinders and requires more oil, on the one hand, the auxiliary oil supply of the motor pump group can slow down the pressure drop when the accumulator is supplied with energy. On the other hand, when the oil pressure of the accumulator is close to or lower than the load of the actuator, the motor pump group can provide starting force for the actuator alone.

[0017] 3. Both the one-way valve and the pump port stop valve are one-way valves, and the oil can only flow from the oil inlet end to the oil outlet end. The pump port stop valve can prevent the high-pressure oil from the accumulator and the actuator from flowing back to the motor pump unit through the oil circuit when the motor pump unit suddenly stops working, causing the motor pump unit to reverse and damage the motor pump unit; the discharge one-way valve can prevent the starting oil provided by the motor pump unit to the actuator from entering the accumulator due to the decrease of the accumulator pressure during the accumulator discharge process, thereby reducing the impact on the action of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an energy storage and release oil circuit system provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of the accumulator group provided in the embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of the energy storage control valve group provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of the energy release control valve group provided in an embodiment of the present application;

[0022] Figure numerals: motor pump group 1, accumulator group 2, accumulator 2-1, accumulator pressure sensor 2-2, oil drain valve 2-3, actuator 3, oil tank 4, first oil circuit 5-1, second oil circuit 5-2, third oil circuit 5-3, fourth oil circuit 5-4, fifth oil circuit 5-5, sixth oil circuit 5-6, seventh oil circuit 5-7, energy storage control valve group 6, first cartridge valve 6-1, first pilot reversing valve 6-2, shuttle valve 6-3, energy release control valve group 7, second cartridge valve 7-1, second pilot reversing valve 7-2, first control branch 8-1, second control branch 8-2, third control branch 8-3, fourth control branch 8-4, fifth control branch 8-5, sixth control branch 8-6, seventh control branch 8-7, pump port stop valve 9, energy release check valve 10, branch oil circuit 11, overflow valve 12. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0024] See also Figure 1 , Figure 1 A structural schematic diagram of an energy storage and release oil circuit system provided in an embodiment of the present application is shown.

[0025] like Figure 1 As shown, an energy storage and release oil circuit system includes a motor pump group 1, an accumulator group 2, an actuator 3 and an oil tank 4 connected to the motor pump group 1; the motor pump group 1 is connected to the accumulator group 2 to store energy for the accumulator group 2, the accumulator group 2 is connected to the actuator 3 to supply energy to the actuator 3, and the motor pump group 1 is connected to the actuator 3 to supply energy to the actuator 3.

[0026] Specifically, when the oil circuit system starts the energy storage action, the motor pump group 1 outputs high-pressure oil, which passes through the first oil circuit 5-1, the second oil circuit 5-2, the third oil circuit 5-3 and the fourth oil circuit 5-4 in turn to reach the accumulator group 2, and the accumulator group 2 receives the high-pressure oil to store energy. When the oil circuit system starts the energy supply action, the accumulator group 2 outputs high-pressure oil, which passes through the fourth oil circuit 5-4, the fifth oil circuit 5-5 and the sixth oil circuit 5-6 in turn to reach the actuator 3, and the actuator 3 receives the high-pressure oil to perform the core pulling operation; at the same time, the motor pump group 1 also outputs high-pressure oil, and the high-pressure oil output by the motor pump group 1 passes through the first oil circuit 5-1 and the seventh oil circuit 5-7 in turn to reach the actuator 3, providing auxiliary pressure to help the actuator 3 perform the core pulling operation.

[0027] Furthermore, a storage control valve group 6 for controlling the connection state between the motor pump group 1 and the accumulator group 2 is provided between the motor pump group 1 and the accumulator group 2, and the storage control valve group 6 is provided between the second oil circuit 5-2 and the third oil circuit 5-3; an energy release control valve group 7 for controlling the connection state between the accumulator group 2 and the actuator 3 is provided between the accumulator group 2 and the actuator 3, and the energy release control valve group 7 is provided between the fourth oil circuit 5-4 and the fifth oil circuit 5-5.

[0028] As an option in the embodiment of the present application, the accumulator group 2 includes an accumulator 2-1, an accumulator pressure sensor 2-2 and an oil drain valve 2-3, and the accumulator 2-1 is connected to the accumulator pressure sensor 2-2 and the oil drain valve 2-3 respectively.

[0029] See here Figure 2 The schematic diagram of the structure of the accumulator group provided in the embodiment of the present application is shown; Figure 2As shown, specifically, the accumulator 2-1 is used to store and output high-pressure oil. The high-pressure oil output by the motor pump group 1 is stored, and the high-pressure oil is output to the actuator 3 when the actuator 3 performs a core pulling operation; the accumulator pressure sensor 2-2 is used to detect the pressure in the accumulator 2-1, and sends an electrical signal when the pressure in the accumulator 2-1 reaches a limit; the oil drain valve 2-3 is used to drain the high-pressure oil in the accumulator 2-1 when the oil circuit system is in a shutdown state, so as to avoid safety hazards in the maintenance process due to the accumulator 2-1 still being in a high-pressure state in the shutdown state.

[0030] As an optional embodiment of the present application, a storage control valve group 6 is connected between the motor pump group 1 and the accumulator group 2, and the storage control valve group 6 includes a first cartridge valve 6-1, a first pilot reversing valve 6-2 and a shuttle valve 6-3; the first cartridge valve 6-1 is connected to the first pilot reversing valve 6-2 through a first control branch 8-1, the first pilot reversing valve 6-2 is connected to the shuttle valve 6-3 through a second control branch 8-2, the shuttle valve 6-3 is connected to the first pilot reversing valve 6-2 through a third control branch 8-3, and the shuttle valve 6-3 is connected to the third oil circuit 5-3 through a fourth control branch 8-4.

[0031] See here Figure 1 and Figure 3 Specifically, the shuttle valve 6-3 is used to compare the oil pressures in the second control branch 8-2 ​​and the fourth control branch 8-4, and input the oil with higher pressure in the second control branch 8-2 ​​and the fourth control branch 8-4 to the third control branch 8-3. The first pilot reversing valve 6-2 cooperates with the shuttle valve 6-3 to control the switch of the first cartridge valve 6-1. When the first pilot reversing valve 6-2 is energized and is in the left position, the oil pressure in the third control branch 8-3 is less than the oil pressure in the second oil circuit 5-2, and the first pilot reversing valve 6-2 is in the left position. When a cartridge valve 6-1 is opened, high-pressure oil flows from the second oil circuit 5-2 into the third oil circuit 5-3 through the first cartridge valve 6-1; when the first pilot reversing valve 6-2 is de-energized and in the right position, the oil pressure in the second oil circuit 5-2 is less than the oil pressure in the third control branch 8-3, the oil action valve core area in the third control branch 8-3 is larger than the oil action area in the second oil circuit 5-2, the first cartridge valve 6-1 is closed, the second oil circuit 5-2 and the third oil circuit 5-3 are not interconnected, and the high-pressure oil cannot flow from here.

[0032] As an optional embodiment of the present application, an energy release control valve group 7 is connected between the accumulator group 2 and the actuator 3, and the energy release control valve group 7 includes a second cartridge valve 7-1 and a second pilot reversing valve 7-2; the second cartridge valve 7-1 is connected to the second pilot reversing valve 7-2 through a fifth control branch 8-5, and the second pilot reversing valve 7-2 is connected to the third oil circuit 5-3 through a sixth control branch 8-6, and is connected to the oil tank 4 through a seventh control branch 8-7.

[0033] See here Figure 1 and Figure 4 Specifically, when the second pilot reversing valve 7-2 is energized and is in the left position, the oil in the fifth control branch 8-5 flows to the oil tank through the second pilot reversing valve 7-2 and the seventh control branch 8-7. At this time, the second cartridge valve 7-1 is opened, and the high-pressure oil flows from the fourth oil circuit 5-4 through the second cartridge valve 7-1 into the fifth oil circuit 5-5; when the second pilot reversing valve 7-2 is de-energized and is in the right position, the oil pressures in the sixth control branch 8-6 and the fifth control branch 8-5 are the same, that is, the oil pressures in the fourth oil circuit 5-4 and the fifth control branch 8-5 are the same, the oil acting on the valve core area in the fifth control branch 8-5 is larger than the oil acting on the fourth oil circuit 5-4, the second cartridge valve 7-1 is closed, the fourth oil circuit 5-4 and the fifth oil circuit 5-5 are not interconnected, and the high-pressure oil cannot flow from here.

[0034] The high-pressure oil cannot flow from the fourth oil passage 5 - 4 into the fifth oil passage 5 - 5 through the second cartridge valve 7 - 1 .

[0035] As an option in the embodiment of the present application, a pump port stop valve 9 is further included, and the pump port stop valve 9 is arranged at the connection between the first oil circuit 5-1 and the second oil circuit 5-2 and the seventh oil circuit 5-7.

[0036] See here Figure 1 The structural schematic diagram of an energy storage and release oil circuit system provided by the embodiment of the present application is shown; Figure 1 As shown, specifically, the pump port stop valve 9 is a one-way valve, so that the high-pressure oil can only flow from the first oil circuit 5-1 to the second oil circuit 5-2 or the seventh oil circuit 5-7, and cannot flow from the second oil circuit 5-2 or the seventh oil circuit 5-7 to the first oil circuit 5-1, thereby preventing the high-pressure oil from flowing back, that is, preventing the high-pressure oil from flowing from the first oil circuit 5-1 to the motor pump group 1.

[0037] As an option in the embodiment of the present application, an energy release one-way valve 10 is further included, and the energy release one-way valve 10 is arranged between the fifth oil circuit 5-5 and the sixth oil circuit 5-6.

[0038] See here Figure 1 The structural schematic diagram of an energy storage and release oil circuit system provided by the embodiment of the present application is shown; Figure 1 As shown, specifically, the energy release check valve 10 is a check valve, which can prevent the oil in the sixth oil circuit 5-6 from flowing back into the accumulator group 2 through the fifth oil circuit 5-5 when the oil pressure output by the accumulator group 2 is less than the starting resistance of the actuator 3.

[0039] As an option in the embodiment of the present application, a branch oil circuit 11 is formed on the first oil circuit 5 - 1 , and a relief valve 12 is provided on the branch oil circuit 11 .

[0040] See here Figure 1 The structural schematic diagram of an energy storage and release oil circuit system provided by the embodiment of the present application is shown; Figure 1 As shown, specifically, the overflow valve 12 is a safety valve. When the oil circuit system is blocked or fails, the high-pressure oil output by the motor pump group 1 can flow into the oil tank through the overflow valve 12 to prevent excessive pressure shock from damaging the accumulator 2-1 and / or the actuator 3.

[0041] As an option in the embodiment of the present application, the accumulator pressure sensor 2 - 2 is electrically connected to the first pilot reversing valve 6 - 2 .

[0042] Specifically, when the accumulator pressure sensor 2-2 detects that the oil pressure in the accumulator group 2 reaches a limit, the accumulator pressure sensor 2-2 sends an electrical signal, the first pilot reversing valve 6-2 receives the electrical signal and loses power, the first pilot reversing valve 6-2 is in the right position, the first cartridge valve 6-1 is closed, the high-pressure oil cannot flow from the second oil circuit 5-2 through the first cartridge valve 6-1 into the third oil circuit 5-3, and the accumulator group 2 stops storing oil.

[0043] As an option in the embodiment of the present application, the oil drain valve 2 - 3 , the first pilot reversing valve 6 - 2 and the overflow valve 12 are all connected to the oil tank 4 .

[0044] See here Figure 1 The structural schematic diagram of an energy storage and release oil circuit system provided by the embodiment of the present application is shown; Figure 1 As shown, specifically, the oil drain valve 2-3 is connected to the oil tank to protect the accumulator group 2 after shutdown, so that the high-pressure oil in the accumulator group 2 can be discharged after shutdown, avoiding safety hazards in the maintenance process due to the accumulator 2-1 still being in a high-pressure state in the shutdown state; the first pilot reversing valve 6-2 is connected to the oil tank 4 to facilitate adjusting the pressure of the third control branch 8-3, thereby controlling the opening and closing of the first cartridge valve 6-1; the overflow valve 12 is connected to the oil tank to protect the motor pump group 1, and prevent excessive pressure shock from causing damage to the accumulator 2-1 and / or the actuator 3.

[0045] As an option in the embodiment of the present application, the first pilot reversing valve 6 - 2 and the second pilot reversing valve 7 - 2 are two-position four-way solenoid valves.

[0046] In actual use, Example 1:

[0047] The oil circuit system first stores oil. At this time, the first pilot reversing valve 6-2 is in the energized state, the first pilot reversing valve 6-2 is in the left position, the second pilot reversing valve 7-2 is in the de-energized state, and the second pilot reversing valve 7-2 is in the right position, so the energy storage control valve group 6 is in the open state, the energy release control valve group 7 is in the closed state, the second oil circuit 5-2 is connected with the third oil circuit 5-3, that is, the motor pump group 1 is connected with the accumulator group 2, the fourth oil circuit 5-4 is not connected with the fifth oil circuit 5-5, that is, the accumulator group 2 is not connected with the actuator 3, and the motor pump group 1 supplies energy to the accumulator group 2.

[0048] When the energy storage of the accumulator group 2 is completed, the accumulator pressure sensor 2-2 sends an electrical signal, and the first pilot reversing valve 6-2 receives the electrical signal and changes to a power-off state. At this time, the first pilot reversing valve 6-2 is in the right position, and the energy storage control valve group 6 is changed to a closed state. The second oil circuit 5-2 is not connected to the third oil circuit 5-3, that is, the motor pump group 1 is not connected to the accumulator group 2.

[0049] When the oil circuit system is discharging energy, the second pilot reversing valve 7-2 is energized and is in the left position. At this time, the energy discharging control valve group 7 is in the open state, and the energy discharging check valve 10 is located between the fourth oil circuit 5-4 and the fifth oil circuit 5-5. The fourth oil circuit 5-4 is connected to the fifth oil circuit 5-5, and the fifth oil circuit 5-5 is connected to the actuator 3. The accumulator group 2 performs energy discharging operation on the actuator 3; at the same time, the motor pump group 1 is connected to the actuator structure through the first oil circuit 5-1 and the seventh oil circuit 5-7, and the auxiliary accumulator group 2 performs energy discharging operation on the actuator 3.

[0050] When the oil circuit system is shut down, the second pilot reversing valve 7-2 loses power and is in the right position. At this time, the energy release control valve group 7 is in a closed state, and the fourth oil circuit 5-4 is not connected to the fifth oil circuit 5-5, that is, the accumulator group 2 is not connected to the actuator 3; at the same time, the oil drain valve 2-3 loses power and is in the left position, and the accumulator 2-1 is connected to the oil tank through the oil drain valve 2-3 to perform the oil release operation.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0052] Although this article uses more reference numerals in the figure: motor pump group 1, accumulator group 2, accumulator 2-1, accumulator pressure sensor 2-2, oil drain valve 2-3, actuator 3, oil tank 4, first oil circuit 5-1, second oil circuit 5-2, third oil circuit 5-3, fourth oil circuit 5-4, fifth oil circuit 5-5, sixth oil circuit 5-6, seventh oil circuit 5-7, energy storage control valve group 6, first cartridge valve 6-1, first pilot reversing valve 6-2, shuttle Valve 6-3, energy release control valve group 7, second cartridge valve 7-1, second pilot reversing valve 7-2, first control branch 8-1, second control branch 8-2, third control branch 8-3, fourth control branch 8-4, fifth control branch 8-5, sixth control branch 8-6, seventh control branch 8-7, pump port stop valve 9, energy release check valve 10, branch oil circuit 11, overflow valve 12 and other terms, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An energy storage and release oil circuit system, characterized in that: It comprises a motor pump group (1), an accumulator group (2), an actuator (3), and an oil tank (4) connected to the motor pump group (1); The motor pump group (1) is in communication with the accumulator group (2) to store energy in the accumulator group (2); the accumulator group (2) is in communication with the actuator (3) to supply energy to the actuator (3); the motor pump group (1) is in communication with the actuator (3) to supply energy to the actuator (3); an energy storage control valve group (6) is connected between the motor pump group (1) and the accumulator group (2), and the energy storage control valve group (6) comprises a first cartridge valve (6-1), a first pilot reversing valve (6-2) and a shuttle valve (6-3); The first cartridge valve (6-1) is connected to the first pilot reversing valve (6-2) via a first control branch (8-1), the first pilot reversing valve (6-2) is connected to the shuttle valve (6-3) via a second control branch (8-2), the shuttle valve (6-3) is connected to the first pilot reversing valve (6-2) via a third control branch (8-3), and the shuttle valve (6-3) is connected to the third oil circuit (5-3) via a fourth control branch (8-4).

2. The energy storage and release oil circuit system according to claim 1, characterized in that: The accumulator group (2) comprises an accumulator (2-1), an accumulator pressure sensor (2-2) and an oil drain valve (2-3); the accumulator (2-1) is respectively connected to the accumulator pressure sensor (2-2) and the oil drain valve (2-3).

3. The energy storage and release oil circuit system according to claim 1, characterized in that: An energy release control valve group (7) is connected between the accumulator group (2) and the actuator (3), and the energy release control valve group (7) comprises a second cartridge valve (7-1) and a second pilot reversing valve (7-2); The second cartridge valve (7-1) is connected to the second pilot reversing valve (7-2) via a fifth control branch (8-5), the second pilot reversing valve (7-2) is connected to the third oil circuit (5-3) via a sixth control branch (8-6), and is connected to the oil tank (4) via a seventh control branch (8-7).

4. An energy storage and release oil circuit system according to any one of claims 1 to 3, characterized in that: It also includes a pump port stop valve (9), which is arranged at the connection between the first oil circuit (5-1), the second oil circuit (5-2) and the seventh oil circuit (5-7).

5. An energy storage and release oil circuit system according to any one of claims 1 to 3, characterized in that: It also includes an energy release one-way valve (10), which is arranged between the fifth oil circuit (5-5) and the sixth oil circuit (5-6).

6. The energy storage and release oil circuit system according to claim 4, characterized in that: A branch oil circuit (11) is formed on the first oil circuit (5-1), and a relief valve (12) is provided on the branch oil circuit (11).

7. The energy storage and release oil circuit system according to claim 2, characterized in that: The accumulator pressure sensor (2-2) is electrically connected to the first pilot reversing valve (6-2).

8. The energy storage and release oil circuit system according to claim 2, characterized in that: The oil drain valve (2-3), the first pilot reversing valve (6-2) and the overflow valve (12) are all connected to the oil tank (4).

9. The energy storage and release oil circuit system according to claim 1, characterized in that: The first pilot reversing valve (6-2) and the second pilot reversing valve (7-2) are two-position four-way solenoid valves.

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