Control system for storing energy and releasing high-flow pressure oil

Abstract

The utility model relates to the field of hydraulic systems, in particular to a control system for storing energy and releasing high-flow pressure oil. Comprising a power source unit, a pressure oil control unit, an energy storage control unit, an energy release control unit, an execution unit, a first oil way, a system oil way, an energy storage oil way, an execution oil way and an energy accumulator. The power source unit is connected with the energy accumulator through a first oil way, a system oil way and an energy storage oil way, and a pressure oil control unit, an energy storage control unit, an energy release control unit and an execution unit which are used for controlling the flow direction of pressure oil are correspondingly arranged on the first oil way, the energy storage oil way, the energy release oil way and the execution oil way. And the power source unit, the pressure oil control unit, the energy storage control unit, the energy release control unit and the execution unit are controlled. The purpose of controlling storage and release of pressure oil can be achieved, and the requirement for providing high-flow pressure oil for an execution unit is met.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic systems, in particular to a control system for storing and releasing large-flow pressure oil. Background Art

[0002] Due to the rapid development of industrial machinery, accumulators have also been widely used in hydraulic systems. In order to adapt to different working conditions, the control of accumulators has become crucial. Some accumulator applications are only suitable for small-flow hydraulic systems and are not suitable for large-flow scenarios. Ordinary accumulators are directly connected in parallel to the system, and the accumulator is directly connected to the system oil circuit. There is no valve group to control the energy storage and release of the accumulator, and the demand for a large amount of flow cannot be met; while in some hydraulic systems with accumulators, the energy storage and energy release are two independent oil circuits, resulting in a relatively large number of pipeline layouts in the hydraulic system.

[0003] Therefore, aiming at the defect problems of the above technologies, the utility model proposes a control system for storing and releasing large-flow pressure oil, which can not only achieve the purpose of controlling the storage and release of pressure oil and meeting the demand for providing large-flow pressure oil to the actuator, but also reduce the pipeline layout, thereby reducing the production cost. Summary of the Invention

[0004] The purpose of the utility model is to solve the problems existing in the prior art, and to propose a control system for storing and releasing large-flow pressure oil.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A control system for storing and releasing large-flow pressure oil, including a hydraulic transmission system: the hydraulic transmission system includes a power source unit, a pressure oil control unit, an energy storage control unit, an energy release control unit, an execution unit, a first oil circuit, a system oil circuit, an energy storage oil circuit, an execution oil circuit and an accumulator;

[0007] Further, the power source unit is connected to the accumulator through the first oil circuit, the system oil circuit, the energy storage oil circuit to provide pressure oil for the accumulator. The pressure oil control unit, the energy storage control unit, the energy release control unit and the execution unit for controlling the flow direction of pressure oil are correspondingly arranged on the first oil circuit, the energy storage oil circuit, the energy release oil circuit and the execution oil circuit. Electromagnetic reversing valves and valve cores are arranged in the pressure oil control unit, the energy storage control unit, the energy release control unit and the execution unit; among them, the energy storage control unit and the energy release control unit share the energy storage oil circuit;

[0008] The system further includes a controller, and the controller controls the power source unit, the pressure oil control unit, the energy storage control unit, the energy release control unit and the execution unit.

[0009] Further, the power source unit includes a motor, an oil pump group, and an oil tank. The output shaft of the motor is connected to the oil pump group, and the inlet of the oil pump group is connected to the oil tank to provide power for the entire hydraulic transmission system.

[0010] The pressure oil control unit is connected by a first oil circuit and includes a first electromagnetic directional control valve and a first spool. The inlet of the first spool is connected to the outlet of the oil pump group, and the outlet of the first spool is connected to the T port of the first electromagnetic directional control valve. The first spool is controlled by the first electromagnetic directional control valve.

[0011] A second spool is connected between the first oil circuit and the system oil circuit. The system oil circuit is connected to the energy storage oil circuit.

[0012] The energy storage control unit is connected by the energy storage oil circuit and includes a second electromagnetic directional control valve, a third spool, and a fourth spool. The third spool and the fourth spool are sequentially connected between the second electromagnetic directional control valve and the accumulator. The third spool is controlled by the second electromagnetic directional control valve.

[0013] The energy release control unit is connected by the energy storage oil circuit and includes a third electromagnetic directional control valve, a third spool, and a fourth spool. The accumulator is connected to the fourth spool, and a third electromagnetic directional control valve is connected between the fourth spool and the accumulator. The fourth spool is controlled by the third electromagnetic directional control valve.

[0014] The execution unit is connected by an execution oil circuit. The execution oil circuit is connected to the system oil circuit and includes a fourth electromagnetic directional control valve, a fifth spool, and a sixth spool. The fourth electromagnetic directional control valve is connected to the fifth spool, the fifth spool is connected to the sixth spool, and the fifth spool is controlled by the fourth electromagnetic directional control valve.

[0015] Further, a first pressure sensor is connected to the system oil circuit, and the first pressure sensor is connected to an external display screen.

[0016] Further, a first safety relief valve is connected between the first spool and the first electromagnetic directional control valve, and the outlet of the first safety relief valve is connected to the oil tank.

[0017] Further, a second pressure sensor is connected between the accumulator and the third electromagnetic directional control valve, and the second pressure sensor is connected to a controller.

[0018] Further, a second safety relief valve is connected between the second pressure sensor and the accumulator, and the outlet of the second safety relief valve is connected to the oil tank.

[0019] Further, a pressure relief valve is connected between the accumulator and the third electromagnetic directional control valve, and the outlet of the pressure relief valve is connected to the oil tank.

[0020] Further, an adjusting rod is further provided at the tail of the fourth spool for adjusting the flow rate of the pressure oil.

[0021] Compared with the existing technology, the advantages of the present utility model are as follows:

[0022] 1. By using an electromagnetic reversing valve to control the opening and closing of the spool, the energy storage of the accumulator and the release of pressure oil are carried out.

[0023] 2. The energy storage oil circuit and the energy release oil circuit are the same oil circuit, reducing the pipeline layout.

[0024] 3. The accumulator can store pressure oil to meet the large flow demand required by the actuator.

[0025] 4. There are three oil supply methods: the accumulator supplies oil alone, the oil pump group supplies oil, and the accumulator and the oil pump group supply oil together to meet the diverse needs of the actuator. Description of the Drawings

[0026] Figure 1 It is the hydraulic control schematic diagram of the present utility model;

[0027] Figure 1 In the figure: 1. Power source unit, 21. Electromagnetic reversing valve 1, 22. Electromagnetic reversing valve 2, 23. Electromagnetic reversing valve 3, 24. Electromagnetic reversing valve 4, 31. Spool 1, 32. Spool 2, 33. Spool 3, 34. Spool 4, 35. Spool 5, 36. Spool 6, 4. Accumulator, 51. Pressure sensor 1, 52. Pressure sensor 2, 61. Safety relief valve 1, 62. Safety relief valve 2, 7. Pressure relief valve, 8. Adjusting rod. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0029] Embodiment 1, as Figure 1 shown, a control system for energy storage and release of large-flow pressure oil, characterized in that it includes a hydraulic transmission system: the hydraulic transmission system includes a power source unit 1, a pressure oil control unit, an energy storage control unit, an energy release control unit, an execution unit, a first oil circuit, a system oil circuit, an energy storage oil circuit, an execution oil circuit, and an accumulator 4;

[0030] The power source unit 1 is connected through a first oil circuit, a system oil circuit, an energy storage oil circuit and an accumulator 4 to supply pressurized oil to the accumulator 4. Pressure oil control units, energy storage control units, energy release control units and actuator units for controlling the flow direction of the pressurized oil are correspondingly arranged on the first oil circuit, the energy storage oil circuit, the energy release oil circuit and the actuator oil circuit. Electromagnetic directional control valves and valve cores are arranged in the pressure oil control unit, the energy storage control unit, the energy release control unit and the actuator unit. Among them, the energy storage control unit and the energy release control unit share the energy storage oil circuit;

[0031] It further includes a controller, and the controller controls the power source unit 1, the pressure oil control unit, the energy storage control unit, the energy release control unit and the actuator unit.

[0032] Through this control system, the pressurized oil in the fuel tank is stored in the accumulator 4 through the power source unit 1 via the first oil circuit, the system oil circuit and the energy storage oil circuit. When the actuator unit requires a large flow of pressurized oil, the pressurized oil in the accumulator 4 can be quickly released for the actuator to work.

[0033] In Embodiment 2, the power source unit 1 includes a motor, an oil pump group and a fuel tank. The output shaft of the motor is connected to the oil pump group, and the inlet of the oil pump group is connected to the fuel tank to provide power for the entire hydraulic transmission system. The output shaft of the motor drives the oil pump group to work, outputs the oil in the fuel tank, and flows into the accumulator 4 for energy storage.

[0034] The pressure oil control unit is connected by the first oil circuit and includes an electromagnetic directional control valve 1 - 21 and a valve core 1 - 31. The inlet of the valve core 1 - 31 is connected to the outlet of the oil pump group, and the outlet of the valve core 1 - 31 is connected to the T port of the electromagnetic directional control valve 1 - 21. The tail of the valve core 1 - 31 is connected to the P port of the electromagnetic directional control valve 1 - 21, and the valve core 1 - 31 is controlled by the electromagnetic directional control valve 1 - 21.

[0035] The electromagnetic directional control valve 1 - 21 can control the on - off of the pressurized oil in the power source unit 1. It is not energized under normal conditions. When the oil pump group supplies pressurized oil, the pressurized oil enters the pressure oil control unit. Since the electromagnetic directional control valve 1 - 21 is in the normal position, the P port, A port and T port of the electromagnetic directional control valve 1 - 21 are connected, and the T port is the oil return port. Therefore, the control oil at the tail of the valve core 1 - 31 returns to the fuel tank. At this time, the valve core 1 - 31 is affected by the pressurized oil and overcomes the spring force at the tail of the valve core 1 - 31, and the pressurized oil is unloaded through the valve core 1 - 31 and returns to the fuel tank.

[0036] When the electromagnetic directional control valve 1 - 21 is energized, the P port and B port of the solenoid valve are connected, and the B port is not supplied with oil. Therefore, the pressurized oil at the tail of the valve core 1 - 31 cannot be depressurized, the valve core 1 - 31 is locked, and no longer unloads pressure, establishing a stable system pressure. The system pressure is determined by the load (the system pressure can reach 31 MPa). The pressurized oil passes through the valve core 2 - 32 and enters the system oil circuit or waits for the accumulator 4 to store energy. Therefore, a stable pressure can be established after the electromagnetic directional control valve 1 - 21 is energized.

[0037] A safety overflow valve 61 is connected between the first spool 31 and the first electromagnetic directional control valve 21, and the outlet of the safety overflow valve 61 is connected to the oil tank.

[0038] When the system is working normally, the valve of the safety overflow valve 61 is closed. It only opens for overflow when the load exceeds the specified limit (the system pressure exceeds the set pressure) to provide overload protection, allowing excessive pressure oil to flow into the oil tank and preventing the system pressure from increasing further (usually making the set pressure of the overflow valve 10% - 20% higher than the maximum working pressure of the system). The safety overflow valve 61 plays a safety protection role.

[0039] A second spool 32 is connected between the first oil circuit and the system oil circuit; the system oil circuit is connected to the energy storage oil circuit; the second spool 32 is used to cut off the pressure oil in the system oil circuit and prevent the pressure oil in the accumulator 4 from entering the oil pump and causing damage to the oil pump.

[0040] A first pressure sensor 51 is connected to the system oil circuit, and the first pressure sensor 51 is connected to an external display screen. The first pressure sensor 51 can monitor the magnitude of the pressure oil in the system oil circuit, and the externally connected display screen can directly read the data.

[0041] The energy storage control unit, connected by the energy storage oil circuit, includes a second electromagnetic directional control valve 22, a third spool 33, and a fourth spool 34. Between the second electromagnetic directional control valve 22 and the accumulator 4, the second electromagnetic directional control valve 22, the third spool 33, and the fourth spool 34 are connected in sequence, and the second electromagnetic directional control valve 22 controls the opening and closing of the third spool 33.

[0042] In this embodiment, the second electromagnetic directional control valve 22 is the energy storage valve of the accumulator 4, which can control the opening and closing of the third spool 33, and ultimately control whether the pressure oil in the system oil circuit flows into the accumulator 4.

[0043] The second electromagnetic directional control valve 22 is not energized under normal conditions, and the pressure oil will flow back to the oil tank through the first spool 31 on the first oil circuit. When the second electromagnetic directional control valve 22 is energized, the A port and the T port of the solenoid valve are connected, and the control oil at the tail end of the third spool 33 returns to the oil tank. The pressure oil overcomes the spring force at the tail of the third spool 33. Since the pressure of the pressure oil is large enough to overcome the spring force at the tail of the fourth spool 34, the third spool 33 and the fourth spool 34 open, and the pressure oil enters the accumulator 4 through the third spool 33 and the fourth spool 34 for energy storage.

[0044] A second pressure sensor 52 is connected between the accumulator 4 and the third electromagnetic directional control valve 23, and the second pressure sensor 52 is connected to the controller.

[0045] When the pressure in pressure sensor 2 52 reaches the set value, it sends a signal to the controller, which de-energizes solenoid valve 2 22 . Ports P and A of solenoid valve 2 2 are connected, allowing pressurized oil to flow through port A into the tail end of valve core 3 3 . Valve core 3 3 resets, preventing further flow of pressurized oil into accumulator 4 , and energy storage is complete. To adjust the flow rate of pressurized oil during energy storage, the motor speed can be adjusted to alter the flow rate.

[0046] A second safety relief valve 62 is connected between the second pressure sensor 52 and the accumulator 4 , and the outlet of the second safety relief valve 62 is connected to the oil tank.

[0047] When the pressure in the accumulator 4 is too high, the second safety relief valve 62 will automatically open the valve to perform overload protection.

[0048] The energy release control unit is connected by the energy storage oil circuit and includes the electromagnetic reversing valve 3 23, the valve core 3 33, and the valve core 4 34. The accumulator 4 is connected to the valve core 4 34. The electromagnetic reversing valve 3 23 is connected between the valve core 4 34 and the accumulator 4. The electromagnetic reversing valve 3 23 controls the opening and closing of the valve core 4 34.

[0049] The energy release and energy storage circuits in the energy release control unit are the same. When solenoid reversing valve 3 (23) is energized, ports T and A in the solenoid valve connect, and the control oil at the end of valve spool 4 (34) returns to the tank. The pressurized oil in accumulator 4 flows through the energy storage circuit, overcoming the spring force of valve spools 3 (33) and 4 (34), opening these valves. The high-flow pressurized oil in accumulator 4 then flows into the system circuit, completing the energy release.

[0050] The execution unit is connected by an execution oil circuit, which is connected to the system oil circuit, and includes an electromagnetic reversing valve four 24, a valve core five 35 and a valve core six 36. The electromagnetic reversing valve four 24 is connected to the valve core five 35, and the valve core five 35 is connected to the valve core six 36. The valve core five 35 is controlled by the electromagnetic reversing valve four 24.

[0051] In this embodiment, when the electromagnetic reversing valve four 24 is energized, the T port and the A port in the electromagnetic reversing valve four 24 are connected, and the control oil at the tail end of the valve core five 35 returns to the oil tank. The pressure oil in the system oil circuit and the pressure oil released by the accumulator 4 overcome the spring force at the tail ends of the valve core five 35 and the valve core six 36 and enter the actuator unit, so that the actuator can achieve the purpose of rapid action.

[0052] In this embodiment, the valve core 6 36 is used to block the pressure oil of the actuator from entering the system oil circuit.

[0053] An adjusting rod 8 is also provided at the tail end of the valve core 4 34 for adjusting the flow rate of the pressure oil.

[0054] A pressure relief valve 7 is connected between the accumulator 4 and the electromagnetic reversing valve 3 23 , and the outlet of the pressure relief valve 7 is connected to the oil tank.

[0055] In this embodiment, the pressure relief valve 7 may be a manual pressure relief valve or an electric pressure relief valve, which can relieve the pressure oil in the accumulator 4 during a power outage or maintenance.

[0056] Example 3, a control method, including the above-mentioned control system for storing energy and releasing high-flow pressure oil, includes the following steps:

[0057] Step 1: The motor oil pump group is started, and the pressure oil enters the pressure oil control unit through the first oil circuit;

[0058] Step 2: The controller controls the electromagnetic reversing valve 21 to be energized, and the valve core 31 is locked to establish a stable system pressure;

[0059] In this embodiment, the system pressure is determined by the actuator. The pressure oil enters the system oil circuit through the valve core 2 32 and waits for the next action;

[0060] Step 3: The pressure oil flows into the system oil circuit and enters the actuator through the execution oil circuit.

[0061] In Example 4, the actuator is a cylinder, and there are three different control methods for supplying oil to the cylinder:

[0062] The first one is that the power source unit 1 supplies oil alone. When the pressure oil flows into the system oil circuit, the electromagnetic reversing valve 22 is in the normal position, and the P port and the A port in the electromagnetic reversing valve 22 are connected, which will control the valve core 33 to be locked. At the same time, the controller controls the electromagnetic reversing valve 4 24 to be energized, and the A port and the T port in the electromagnetic reversing valve 4 24 are connected. The pressure oil in the system oil circuit can only flow through the execution oil circuit and then enter the oil cylinder from the execution oil circuit.

[0063] In the second method, accumulator 4 supplies oil to the cylinder independently. When pressurized oil flows into the system oil circuit, the controller energizes electromagnetic reversing valve 22, allowing the pressurized oil to flow through valve core 33 and valve core 4 34 into accumulator 4 for energy storage. When pressure sensor 2 52 detects that the pressure has reached the set value, it sends a signal to the controller, de-energizing electromagnetic reversing valve 22. Pressurized oil no longer flows into accumulator 4, completing energy storage.

[0064] When energy needs to be released to supply oil to the cylinder, the controller controls the electromagnetic reversing valve three 23 to be energized, and the tail of the valve core four 34 releases the pressure oil. At the same time, the controller controls the electromagnetic reversing valve four 24 to be energized, and the A port and T port of the electromagnetic reversing valve four 24 are connected, and the pressure oil flows into the system oil circuit. Because the valve core two 32 is used to isolate the pressure oil of the system oil circuit from flowing into the oil tank, the pressure oil can only flow into the execution oil circuit and then into the cylinder.

[0065] Thirdly, the power source unit 1 and the accumulator 4 supply oil to the oil cylinder together. The controller controls the energization of the first electromagnetic directional valve 21, the energization of the third electromagnetic directional valve 23, and the energization of the fourth electromagnetic directional valve 24. The pressure oil in the accumulator 4 and the fuel tank flows into the system oil circuit. Since the pressure in the execution oil circuit is low, the pressure oil in the system oil circuit can only flow into the execution oil circuit and then enter the oil cylinder.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A control system for storing and releasing a large flow of pressurized oil, characterized in that, It includes a hydraulic transmission system: The hydraulic transmission system includes a power source unit (1), a pressure oil control unit, an energy storage control unit, an energy release control unit, an execution unit, a first oil circuit, a system oil circuit, an energy storage oil circuit, an execution oil circuit, and an accumulator (4); The power source unit (1) is connected through the first oil circuit, the system oil circuit, the energy storage oil circuit, and the accumulator (4), and provides pressure oil for the accumulator (4). A pressure oil control unit, an energy storage control unit, an energy release control unit, and an execution unit for controlling the flow direction of the pressure oil are correspondingly arranged on the first oil circuit, the energy storage oil circuit, the energy release oil circuit, and the execution oil circuit. An electromagnetic reversing valve and a valve core are arranged in each of the pressure oil control unit, the energy storage control unit, the energy release control unit, and the execution unit; among them, the energy storage control unit and the energy release control unit share the energy storage oil circuit; It also includes a controller, and the controller controls the power source unit (1), the pressure oil control unit, the energy storage control unit, the energy release control unit, and the execution unit; The power source unit (1) includes a motor, an oil pump group, and an oil tank. The output shaft of the motor is connected to the oil pump group, and the inlet of the oil pump group is connected to the oil tank. The power source unit provides power for the entire hydraulic transmission system; The pressure oil control unit, connected by the first oil circuit, includes an electromagnetic reversing valve I (21) and a valve core I (31). The inlet of the valve core I (31) is connected to the outlet of the oil pump group, the outlet of the valve core I (31) is connected to the T port of the electromagnetic reversing valve I (21), and the valve core I (31) is controlled by the electromagnetic reversing valve I (21); A valve core II (32) is connected between the first oil circuit and the system oil circuit; the system oil circuit is connected to the energy storage oil circuit; The energy storage control unit, connected by the energy storage oil circuit, includes an electromagnetic reversing valve II (22), a valve core III (33), and a valve core IV (34). The valve core III (33) and the valve core IV (34) are sequentially connected between the electromagnetic reversing valve II (22) and the accumulator (4), and the valve core III (33) is controlled by the electromagnetic reversing valve II (22); The energy release control unit, connected by the energy storage oil circuit, includes an electromagnetic reversing valve III (23), a valve core III (33), and a valve core IV (34). The accumulator (4) is connected to the valve core IV (34), an electromagnetic reversing valve III (23) is connected between the valve core IV (34) and the accumulator (4), and the valve core IV (34) is controlled by the electromagnetic reversing valve III (23); The execution unit, connected by the execution oil circuit, and the execution oil circuit is connected to the system oil circuit, includes an electromagnetic reversing valve IV (24), a valve core V (35), and a valve core VI (36). The electromagnetic reversing valve IV (24) is connected to the valve core V (35), the valve core V (35) is connected to the valve core VI (36), and the valve core V (35) is controlled by the electromagnetic reversing valve IV (24).

2. The control system for storing and releasing a large flow of pressurized oil according to claim 1, characterized in that, A pressure sensor I (51) is connected to the system oil circuit, and the pressure sensor I (51) is connected to an external display screen.

3. A control system for storing and releasing a large flow of pressurized oil, according to claim 1, characterized in that, A safety overflow valve I (61) is connected between the valve core I (31) and the electromagnetic directional control valve I (21), and the outlet of the safety overflow valve I (61) is connected to the oil tank.

4. A control system for storing and releasing a large flow of pressurized oil, according to claim 1, characterized in that: A pressure sensor II (52) is connected between the accumulator (4) and the electromagnetic directional control valve III (23), and the pressure sensor II (52) is connected to the controller.

5. The control system for storing and releasing a large flow of pressurized oil according to claim 4, characterized in that: A safety overflow valve II (62) is connected between the pressure sensor II (52) and the accumulator (4), and the outlet of the safety overflow valve II (62) is connected to the oil tank.

6. A control system for storing and releasing a large flow of pressurized oil, according to claim 5, characterized in that A pressure relief valve (7) is connected between the accumulator (4) and the electromagnetic directional control valve III (23), and the outlet of the pressure relief valve (7) is connected to the oil tank.

7. A control system for storing and releasing a large flow of pressurized oil, according to claim 1, characterized in that An adjusting rod (8) is further arranged on the valve core IV (34) for adjusting the flow rate of the pressure oil.

Images