High-vacuum hydraulic system

Abstract

The high-vacuum hydraulic system comprises a hydraulic supply module, a control module, an oil way module and a data acquisition module, an energy accumulator is connected with an electromagnetic directional valve through an oil way, and when pressure is released, a hydraulic valve controlled by a vacuum machine is driven to act so as to close a vacuum valve body of the vacuum machine in advance; meanwhile, hydraulic supply is automatically triggered according to feedback of a pressure sensor, the action time sequence of a hydraulic valve is accurately driven through cooperative control of an energy accumulator and an electromagnetic ball valve, and valve body blockage is avoided; the oil way system is provided with an oil suction filter element, an air filter and an oil return filter, multiple filtering guarantees the cleanliness of oil liquid, and the service life of elements is prolonged; the pilot-operated type unloading valve is free of electric control self-adaptive unloading, directly senses the pressure at the tail end of the oil way, is high in response speed, avoids the delay problem of traditional electric control unloading, and ensures that the pressure of the oil way is accurately regulated and controlled in real time.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and more specifically, to a high-vacuum hydraulic system. Background Technology

[0002] In die casting, to ensure that gas inside the mold cavity can be expelled in a very short time, a vacuum machine and its dedicated vacuum valve are often installed on the die casting machine. Industry practice is to directly integrate the vacuum valve's cylinder into the die casting machine or central hydraulic station, driving it through an external hydraulic power source. This external connection method has significant drawbacks: 1. Frequent movements and large flow fluctuations in the die casting machine make it difficult to maintain a constant instantaneous pressure at the vacuum valve station, easily leading to premature or delayed valve closure. 2. The viscosity and cleanliness of the external oil do not match the cylinder diameter and cycle time of the vacuum valve; long-term impact can cause the valve core to jam, become blocked, or even burn, affecting vacuum stability. 3. Traditional systems lack independent monitoring of the dedicated oil circuit for the vacuum valve; on-site inspection relies solely on visual checks with pressure gauges, resulting in low fault location efficiency.

[0003] The closest existing technology is disclosed in patent announcement number CN220929803U, which discloses an energy-saving hydraulic system including an unloading valve, an accumulator, an oil inlet P connected to an oil supply device, and a working oil port PA for connection to a control system. The inlet of the unloading valve is connected to the oil inlet P, the unloading port of the unloading valve is connected to the return oil tank, the charging and discharging ports of the accumulator are respectively connected to the outlet of the unloading valve and the working oil port PA, and a pressure sensor is connected between the charging and discharging ports of the accumulator and the working oil port PA.

[0004] The existing system mainly focuses on energy saving. On the one hand, the working pressure is as high as 23-25MPa, far exceeding the 12-14MPa required by the die-casting vacuum valve. On the other hand, it still relies on external pumps for oil replenishment, which makes it difficult to solve the problems of inaccurate vacuum valve closing time and frequent valve blockage.

[0005] Therefore, there is an urgent need for a self-supplying, simplified hydraulic system that can be linked in a closed loop with a vacuum machine to achieve stable, efficient, and easy-to-maintain vacuum exhaust control for die casting. Utility Model Content

[0006] The purpose of this invention is to propose a self-supplying, structurally simplified high-vacuum hydraulic system.

[0007] A high-vacuum hydraulic system, characterized in that it comprises:

[0008] The hydraulic supply module adopts a self-supply method and includes an oil tank 1, a vane pump 8, a three-phase asynchronous motor 7 and an accumulator 13. The vane pump 8 is driven by the three-phase asynchronous motor 7 to draw hydraulic oil from the oil tank 1 and deliver it to the accumulator 13 for storage.

[0009] The control module includes an electromagnetic reversing valve 14, a pilot-operated unloading valve 9, and a pressure sensor 18. The electromagnetic reversing valve 14 receives the vacuum machine control signal, the pilot-operated unloading valve 9 achieves adaptive unloading based on the pressure feedback at the end of the oil circuit, and the pressure sensor 18 monitors the pressure of the accumulator 13 in real time.

[0010] The hydraulic circuit module connects the hydraulic supply module and the control module, uses anti-wear hydraulic oil, and achieves pressure adaptive unloading through a pilot-operated unloading valve 9.

[0011] The data acquisition module integrates a pressure gauge 11, a liquid level thermometer 3, and a temperature controller 5 to collect hydraulic pressure, flow rate, and oil temperature parameters in real time and generate operating data curves.

[0012] The accumulator 13 is connected to the solenoid directional valve 14 via an oil circuit. When the pressure is released, it drives the hydraulic valve controlled by the vacuum machine to close the vacuum valve body of the vacuum machine in advance. At the same time, it automatically triggers hydraulic replenishment based on the feedback from the pressure sensor 18.

[0013] In some embodiments, the vane pump 8 of the hydraulic supply module outputs a flow rate of 20 L / min and the hydraulic pressure fluctuates within a range of 120-140 bar.

[0014] In some embodiments, the pilot-operated unloading valve 9 directly unloads by sensing the pressure at the end of the oil circuit, without the need for electronic control signals, and monitors the pressure changes inside the oil circuit in real time.

[0015] In some embodiments, the hydraulic circuit module further includes a solenoid ball valve 15, which works in conjunction with the accumulator 13 to control the timing of the hydraulic valve's extension and retraction.

[0016] In some embodiments, the data acquisition module further includes an air cooler 17 for regulating the hydraulic oil temperature and for monitoring the oil tank level via a level control relay 6.

[0017] In some embodiments, the oil suction filter 2 and the air filter 4 in the oil circuit module are respectively installed at the oil inlet and the breather of the oil tank 1 to ensure the cleanliness of the oil.

[0018] In some implementations, the hydraulic supply module's manifold design parameters include matching pump power to vacuum machine requirements, optimizing flow distribution based on oil pipe cross-sectional area, and setting the unloading valve response threshold to 130 bar.

[0019] In some embodiments, the oil circuit module is provided with an overflow valve 12 and a return oil filter 16 for regulating system pressure and filtering oil impurities.

[0020] In some implementations, the anti-wear hydraulic oil is 46# anti-wear hydraulic oil.

[0021] The beneficial effects of this utility model are:

[0022] (1) Significantly improved stability: The self-supplying hydraulic system avoids dependence on external hydraulic sources and eliminates pressure fluctuations and abnormal flow rates caused by mismatch of external oil types such as 68# hydraulic oil. The system flow rate is stable at 20L / min and the pressure fluctuation range is strictly controlled within 120-140bar. The pilot-operated unloading valve 9 is an electrically controlled adaptive unloading system that directly senses the pressure at the end of the oil circuit. It has a fast response speed and avoids the delay problem of traditional electrically controlled unloading, ensuring real-time and accurate control of oil circuit pressure.

[0023] (2) Significantly reduced failure rate: The accumulator 13 and the solenoid ball valve 15 work together to control the hydraulic valve action sequence precisely, avoiding valve blockage; the oil circuit module is equipped with oil suction filter 2, air filter 4 and return oil filter 16, multiple filtration to ensure oil cleanliness and extend component life.

[0024] (3) Data acquisition and intelligent management: The data acquisition module integrates multi-sensor pressure gauge, liquid level thermometer and temperature controller to record hydraulic pressure, flow rate, oil temperature and other parameters in real time, generate dynamic curves and synchronize them to the control system, which facilitates fault warning and process optimization; the air cooler 17 intelligently controls the temperature to prevent the hydraulic oil viscosity from changing due to excessive oil temperature, and further ensures the stability of the system.

[0025] (4) Improved production efficiency: By closing the vacuum valve body in advance and controlling the pressure precisely, the residual gas in the mold cavity during the casting process is reduced, thereby improving the yield of die-cast products; reducing the system failure rate, extending the maintenance cycle, and improving production efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a high-vacuum hydraulic system according to this application.

[0027] Figure 2 This is a schematic diagram of the hydraulic supply module structure of a high vacuum hydraulic system according to this application.

[0028] Explanation of main component symbols

[0029] 1. Oil tank; 2. Oil suction filter element; 3. Liquid level thermometer; 4. Air filter; 5. Temperature controller; 6. Liquid level control relay; 7. Three-phase asynchronous motor; 8. Vane pump; 9. Pilot-operated unloading valve; 11. Pressure gauge; 12. Overflow valve; 13. Accumulator; 14. Solenoid directional valve; 15. Solenoid ball valve; 16. Return oil filter; 17. Air cooler; 18. Pressure sensor.

[0030] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0031] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0032] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0033] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.

[0034] Example 1:

[0035] like Figure 1 The diagram shown is a flowchart of a method for detecting open and short circuits in wires according to this application; Figure 2 The diagram shown is a circuit diagram of a method for detecting open and short circuits in wires according to this application.

[0036] A high-vacuum hydraulic system, characterized in that it comprises:

[0037] The hydraulic supply module adopts a self-supply method and includes an oil tank 1, a vane pump 8, a three-phase asynchronous motor 7 and an accumulator 13. The vane pump 8 is driven by the three-phase asynchronous motor 7 to draw hydraulic oil from the oil tank 1 and deliver it to the accumulator 13 for storage.

[0038] The control module includes an electromagnetic reversing valve 14, a pilot-operated unloading valve 9, and a pressure sensor 18. The electromagnetic reversing valve 14 receives the vacuum machine control signal, the pilot-operated unloading valve 9 achieves adaptive unloading based on the pressure feedback at the end of the oil circuit, and the pressure sensor 18 monitors the pressure of the accumulator 13 in real time.

[0039] The hydraulic circuit module connects the hydraulic supply module and the control module, uses anti-wear hydraulic oil, and achieves pressure adaptive unloading through a pilot-operated unloading valve 9.

[0040] The data acquisition module integrates a pressure gauge 11, a liquid level thermometer 3, and a temperature controller 5 to collect hydraulic pressure, flow rate, and oil temperature parameters in real time and generate operating data curves.

[0041] The accumulator 13 is connected to the solenoid directional valve 14 via an oil circuit. When the pressure is released, it drives the hydraulic valve controlled by the vacuum machine to close the vacuum valve body of the vacuum machine in advance. At the same time, it automatically triggers hydraulic replenishment based on the feedback from the pressure sensor 18.

[0042] The high vacuum hydraulic system is characterized in that the vane pump 8 of the hydraulic supply module has an output flow rate of 20L / min and a hydraulic pressure fluctuation range of 120-140bar.

[0043] In some embodiments, the pilot-operated unloading valve 9 directly unloads by sensing the pressure at the end of the oil circuit, without the need for electronic control signals, and monitors the pressure changes inside the oil circuit in real time.

[0044] In some embodiments, the hydraulic circuit module further includes a solenoid ball valve 15, which works in conjunction with the accumulator 13 to control the timing of the hydraulic valve's extension and retraction.

[0045] In some embodiments, the data acquisition module further includes an air cooler 17 for regulating the hydraulic oil temperature and for monitoring the oil tank level via a level control relay 6.

[0046] In some embodiments, the oil suction filter 2 and the air filter 4 in the oil circuit module are respectively installed at the oil inlet and the breather of the oil tank 1 to ensure the cleanliness of the oil.

[0047] In some implementations, the hydraulic supply module's manifold design parameters include matching pump power to vacuum machine requirements, optimizing flow distribution based on oil pipe cross-sectional area, and setting the unloading valve response threshold to 130 bar.

[0048] In some embodiments, the oil circuit module is provided with an overflow valve 12 and a return oil filter 16 for regulating system pressure and filtering oil impurities.

[0049] The working principle of this utility model:

[0050] Step 1: System Start-up: The vacuum machine sends a control signal to the solenoid directional valve 14, the hydraulic supply module starts, and the three-phase asynchronous motor 7 drives the vane pump 8 to draw 46# anti-wear hydraulic oil from the oil tank 1. After being filtered by the oil suction filter element 2, it is delivered to the accumulator 13 for storage.

[0051] Step 2: Pressure storage and monitoring: The accumulator 13 monitors the pressure in real time through the pressure sensor 18. When the pressure reaches the set threshold of 140 bar, the pilot-operated unloading valve 9 automatically unloads based on the pressure at the end of the oil circuit to prevent overpressure.

[0052] Step 3: Hydraulic valve drive: After receiving the vacuum machine command, the solenoid directional valve 14 switches the oil circuit direction, and the hydraulic energy stored in the accumulator 13 is released through the oil circuit, driving the hydraulic valve to push out or retract, and closing the vacuum valve body in advance.

[0053] Step 4: Pressure Feedback and Replenishment: Pressure sensor 18 continuously monitors the accumulator pressure. If the pressure is lower than 120 bar, vane pump 4 restarts to replenish hydraulic energy, ensuring that the system pressure is stable within the range of 120-140 bar.

[0054] Step 5: Data Acquisition and Control: The data acquisition module collects parameters such as pressure, flow rate, and oil temperature in real time through pressure gauge 11, liquid level thermometer 3, and temperature controller 5, and generates dynamic operating curves; air cooler 17 and return oil filter 16 adjust oil temperature and filter impurities respectively, and liquid level control relay 6 monitors the oil tank level to ensure continuous and stable operation of the system.

[0055] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.

Claims

1. A high-vacuum hydraulic system, characterized in that, include: The hydraulic supply module adopts a self-supply method and includes an oil tank (1), a vane pump (8), a three-phase asynchronous motor (7) and an accumulator (13). The vane pump (8) is driven by the three-phase asynchronous motor (7) to draw hydraulic oil from the oil tank (1) and deliver it to the accumulator (13) for storage. The control module includes an electromagnetic directional valve (14), a pilot-operated unloading valve (9), and a pressure sensor (18). The electromagnetic directional valve (14) receives the vacuum machine control signal, the pilot-operated unloading valve (9) achieves adaptive unloading based on the pressure feedback at the end of the oil circuit, and the pressure sensor (18) monitors the pressure of the accumulator (13) in real time. The oil circuit module connects the hydraulic supply module and the control module, uses anti-wear hydraulic oil, and achieves pressure adaptive unloading through a pilot-operated unloading valve (9). The data acquisition module integrates a pressure gauge (11), a liquid level thermometer (3), and a temperature controller (5) to collect hydraulic pressure, flow rate, and oil temperature parameters in real time and generate operating data curves. The accumulator (13) is connected to the solenoid directional valve (14) through an oil circuit. When the pressure is released, it drives the hydraulic valve controlled by the vacuum machine to close the vacuum valve body of the vacuum machine in advance. At the same time, it automatically triggers hydraulic replenishment based on the feedback from the pressure sensor (18).

2. The high-vacuum hydraulic system according to claim 1, characterized in that, The vane pump (8) of the hydraulic supply module has an output flow rate of 20L / min and a hydraulic pressure fluctuation range of 120-140bar.

3. The high-vacuum hydraulic system according to claim 1, characterized in that, The pilot-operated unloading valve (9) directly unloads by sensing the pressure at the end of the oil circuit, without the need for electrical control signals, and monitors the pressure changes inside the oil circuit in real time.

4. The high-vacuum hydraulic system according to claim 1, characterized in that, The oil circuit module also includes a solenoid ball valve (15), which works with the accumulator (13) to control the timing of the hydraulic valve's ejection and retraction.

5. The high-vacuum hydraulic system according to claim 1, characterized in that, The data acquisition module further includes an air cooler (17) for regulating the temperature of the hydraulic oil and monitoring the oil tank level through a level control relay (6).

6. The high-vacuum hydraulic system according to claim 1, characterized in that, The oil suction filter (2) and air filter (4) in the oil circuit module are respectively installed at the oil inlet and the breather of the oil tank (1) to ensure the cleanliness of the oil.

7. The high-vacuum hydraulic system according to claim 1, characterized in that, The hydraulic supply module's oil circuit design parameters include matching pump power to vacuum machine requirements, optimizing oil pipe cross-sectional area for flow distribution, and setting the unloading valve response threshold to 130 bar.

8. The high-vacuum hydraulic system according to claim 1, characterized in that, The oil circuit module is equipped with an overflow valve (12) and a return oil filter (16) for regulating system pressure and filtering oil impurities.

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