A hydraulic control system for a lift cylinder of a stripper

Abstract

The application discloses a demolding machine lifting oil cylinder and a hydraulic control system thereof, which is applied to the field of hydraulic control of demolding machines and comprises a demolding machine and a hydraulic control component. The demolding machine comprises multiple groups of lifting oil cylinders, the hydraulic control component comprises an oil tank module and a circuit module, the circuit module is connected with the lifting oil cylinders and the oil tank module, the oil tank module comprises an oil tank, temperature sensor one and viscosity sensor one are arranged in the oil tank, a pump body one is arranged outside the oil tank, an oil inlet end of the pump body one is connected with the oil tank pipeline, an oil outlet end of the pump body one is connected with the circuit module, a pump body two, a temperature control component and an oil pressure component are arranged on one side of the oil tank, and the circuit module comprises a main oil pipe one, a main oil pipe two, an oil pipe one, an oil pipe two, an oil inlet pipe and an oil outlet pipe. The application has the characteristics of realizing combined regulation and control of hydraulic oil.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology for demolding machines, specifically a hydraulic control system for the lifting cylinder of a demolding machine. Background Technology

[0002] Demolding machines are key automated equipment in industry that enables the automatic separation of molded products from molds. Their core function is to smoothly and safely remove solidified products from the mold cavity. The lifting cylinder is the core actuator of the demolding machine. It uses the extension and retraction of the lifting cylinder to provide linear thrust and pull force to achieve product demolding.

[0003] During the process of conveying hydraulic oil, the viscosity and oil pressure fluctuate due to the loss of hydraulic oil temperature, which further affects the working stroke of the lifting cylinder. In the current technology, the regulation of hydraulic oil is still at the level of simple temperature control, which only focuses on the temperature value and does not take into account viscosity and oil pressure. This makes the control method of the hydraulic system cumbersome and affects production efficiency.

[0004] Therefore, a hydraulic control system for the lifting cylinder of the demolding machine is designed to realize the combined regulation of hydraulic oil and improve the working stability of the demolding machine. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic control system for the lifting cylinder of a demolding machine to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydraulic control system for lifting cylinders of a demolding machine, comprising a demolding machine and a hydraulic control component, wherein the demolding machine comprises multiple sets of lifting cylinders, and the hydraulic control component comprises an oil tank module and a circuit module;

[0007] The circuit module connects the oil tank module to the lifting cylinder. The oil tank module includes an oil tank, inside which a temperature sensor and a viscosity sensor are installed. A pump body is installed outside the oil tank. The oil inlet of the pump body is connected to the oil tank pipeline, and the oil outlet of the pump body is connected to the circuit module.

[0008] The oil tank is equipped with a pump body, a temperature control component, and an oil pressure component on one side.

[0009] The circuit module includes main oil pipe one, main oil pipe two, oil pipe one, oil pipe two, oil inlet pipe and oil outlet pipe.

[0010] According to the above technical solution, the temperature control component includes an electromagnetic reversing valve, a heater, and an oil cooler. The two ends of the pump body are respectively connected to the electromagnetic reversing valve and the oil tank pipeline. The inlet ends of the heater and the oil cooler are respectively connected to the electromagnetic reversing valve pipeline. The outlet ends of the heater and the oil cooler are both connected to the oil tank.

[0011] According to the above technical solution, the output end of the pump body one is connected to the inlet end of the main oil pipe one. A temperature sensor two, a viscosity sensor two, and a filter are connected to the main oil pipe one near the pump body one. Multiple flow control valves are installed on the main oil pipe one to branch multiple branch pipes. Each branch pipe is connected to the inlet end of a different group of oil inlet pipes. The outlet end of the oil inlet pipe is inserted into the interior of the demolding machine. A solenoid directional valve two is connected to the outlet end of the oil inlet pipe. A temperature sensor three and a viscosity sensor three are connected to the oil inlet pipe near the solenoid directional valve two.

[0012] According to the above technical solution, the outlet end of the electromagnetic reversing valve two is respectively connected to the electromagnetic reversing valve three and the return box. The return box is located outside the demolding machine, and the pump body four is installed inside the return box. The return box is connected to the electromagnetic reversing valve one via a pipeline.

[0013] According to the above technical solution, both the second electromagnetic reversing valve and the third electromagnetic reversing valve are installed inside the demolding machine, and the output end of the third electromagnetic reversing valve is connected to the first oil pipe and the second oil pipe.

[0014] An oil port one is provided on the shaft away from the output end of the lifting cylinder, and an oil port two is provided on the shaft close to the output end of the lifting cylinder. The oil pipe one and the oil pipe two are respectively connected to the oil port one and the oil port two pipelines.

[0015] According to the above technical solution, the electromagnetic reversing valve three is connected to an oil outlet pipe, and multiple groups of flow valves are installed on the main oil pipe two to branch multiple branch pipes. Each group of branch pipes is connected to the oil outlet pipe. The output end of the main oil pipe two is connected to the oil tank. The oil pressure assembly includes an oil pressure sensor one, an overflow valve, an accumulator, a throttle valve, an oil pressure sensor two, an oil pressure sensor three, an oil pressure sensor four, and an oil pressure sensor five.

[0016] According to the above technical solution, the first oil pressure sensor is installed inside the oil tank, the overflow valve is connected to the output end of the first pump body through the first main oil pipe, the accumulator is connected in parallel on the first main oil pipe between the overflow valve and the second viscosity sensor, and the third oil pressure sensor is connected in the pipeline of the first main oil pipe downstream of the parallel interface of the accumulator.

[0017] The throttle valve and the second oil pressure sensor are connected in series between the second and third electromagnetic directional valves. Two sets of the fourth oil pressure sensor are provided, and the two sets of the fourth oil pressure sensor are symmetrically arranged on the first and second oil pipes respectively. The fifth oil pressure sensor is connected in series on the outlet pipe.

[0018] According to the above technical solution, the hydraulic control system includes the following usage methods:

[0019] Method 1: When the demolding machine is working, the hydraulic control component is activated, thereby driving the output end of the lifting cylinder to perform lifting and lowering movements to achieve demolding;

[0020] Method 2: Use various viscosity sensors and temperature sensors to detect the state of the hydraulic oil and ensure stable hydraulic oil pressure;

[0021] Method 3: The load of the demolding machine varies with the different specifications of the product. Based on Method 1 and Method 2, the working conditions and hydraulic oil parameters of the demolding machine are dynamically adjusted.

[0022] According to the above technical solution, method two includes the following steps:

[0023] Step 1: Use the temperature sensor 1 and the viscosity sensor 1 to detect the temperature and viscosity of the hydraulic oil inside the oil tank, and use the temperature control component to regulate the temperature of the hydraulic oil inside the oil tank;

[0024] Step 2: The viscosity changes of hydraulic oil during the process of being transported from the oil tank to the lifting cylinder are detected by various temperature sensors and viscosity sensors installed outside the oil tank. The oil temperature is adjusted by the return box and temperature control components to compensate for the temperature loss during the transportation of hydraulic oil, thereby ensuring that the viscosity fluctuation is within the ideal range.

[0025] Step 3: Based on Step 2, the hydraulic oil pressure in the circuit module is adjusted by the hydraulic component to establish a combined control system for oil temperature, viscosity and oil pressure, further ensuring the thrust stability of the lifting cylinder and the safety of the oil circuit;

[0026] Step 4: The heat loss of hydraulic oil during the transportation process was detected in Step 2. In Step 3, a combined control system for oil temperature, viscosity and oil pressure was established. The data from each group of sensors were integrated to ensure that the oil temperature, viscosity and oil pressure were all within the qualified range.

[0027] Step 5: When the electromagnetic reversing valve switches the oil circuit, the change in the flow direction of the hydraulic oil will cause instantaneous fluctuations in the main oil pipe 1 and the main oil pipe 2. The accumulator absorbs and compensates for the fluctuations to ensure the stability of the oil pressure, further improve the smoothness of the lifting cylinder's operation, and improve the working accuracy of the demolding machine.

[0028] According to the above technical solution, method three includes the following steps:

[0029] Step 1: Working condition identification. By checking the switching state of the electromagnetic reversing valve three, the extension and retraction of the lifting cylinder is determined to avoid misjudgment. Combined with the actual detection data of the hydraulic pressure sensor two and the hydraulic pressure sensor four in Step 3, the load status of the demolding machine is determined.

[0030] Step 2: Based on the working condition detection results in Step 1, combined with the temperature compensation in Step 2 of Method 2, the oil pressure regulation in Step 3 of Method 2, and the accumulator fluctuation compensation in Step 5, adjust the hydraulic oil parameters within a reasonable range.

[0031] Step 3: During the working condition adaptation and adjustment process, the real-time data obtained from the detection in Steps 2 and 3 of Method 2 is compared with the standard parameters of the current working condition. If a deviation occurs, dynamic adjustment is performed using the return box, temperature control component, overflow valve, and throttle valve to quickly restore the hydraulic oil parameters to the standard range, forming a closed-loop control system from detection to adjustment to feedback to detection to adjustment, further improving the working efficiency of the hydraulic control system.

[0032] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, by setting up a hydraulic control component, realizes the detection of temperature, viscosity and oil pressure of hydraulic oil during transportation; by setting up a temperature control component, it realizes the regulation of oil temperature, thereby adjusting viscosity; by setting up various detection components and valves, it establishes a combined regulation system of oil temperature, viscosity and oil pressure, further improving the working efficiency of the demolding machine. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a schematic diagram of the hydraulic system of the present invention;

[0035] Figure 2 This is the present invention. Figure 1 Schematic diagram of area A;

[0036] Figure 3 This is the present invention. Figure 1 Schematic diagram of area B;

[0037] Figure 4 This is the present invention. Figure 1 Schematic diagram of region C;

[0038] Figure 5This is a schematic diagram of the lifting cylinder structure of the present invention;

[0039] In the diagram: 1. Demolding machine; 2. Lifting cylinder; 3. Oil tank; 4. Temperature sensor 1; 5. Viscosity sensor 1; 6. Pump body 1; 7. Pump body 2; 8. Filter; 9. Solenoid directional valve 1; 10. Heater; 11. Oil cooler; 12. Main oil pipe 1; 13. Main oil pipe 2; 14. Temperature sensor 2; 15. Viscosity sensor 2; 16. Oil pipe 1; 17. Oil pipe 2; 18. Oil inlet pipe; 19. Oil outlet pipe; 20. Solenoid directional valve 2; 21. Temperature sensor 3; 22. Viscosity sensor 3; 23. Solenoid directional valve 3; 24. Return box; 25. Oil port 1; 26. Oil port 2; 27. Oil pressure sensor 1; 28. Overflow valve; 29. ​​Accumulator; 30. Throttle valve; 31. Oil pressure sensor 2; 32. Oil pressure sensor 3; 33. Oil pressure sensor 4; 34. Oil pressure sensor 5. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-4 The present invention provides a technical solution: a hydraulic control system for lifting cylinders of a demolding machine, including a demolding machine 1 and a hydraulic control component. The demolding machine 1 is the prior art. The demolding machine 1 includes multiple sets of lifting cylinders 2. The hydraulic control component includes an oil tank module and a circuit module.

[0042] The circuit module connects the oil tank module to the lifting cylinder 2. The oil tank module includes an oil tank 3. The oil tank 3 is equipped with a temperature sensor 4 and a viscosity sensor 5. A pump body 6 is installed on the outside of the oil tank 3. The oil inlet of the pump body 6 is connected to the pipeline of the oil tank 3, and the oil outlet of the pump body 6 is connected to the circuit module.

[0043] Pump body 2 7, temperature control component and hydraulic component are installed on one side of oil tank 3.

[0044] The temperature control assembly includes a solenoid directional valve 9, a heater 10, and an oil cooler 11. The two ends of the pump body 7 are respectively connected to the solenoid directional valve 9 and the oil tank 3. The inlet ends of the heater 10 and the oil cooler 11 are respectively connected to the solenoid directional valve 9. The outlet ends of the heater 10 and the oil cooler 11 are both connected to the oil tank 3.

[0045] The line module includes main oil pipe 12, main oil pipe 2 13, oil pipe 16, oil pipe 2 17, oil inlet pipe 18, and oil outlet pipe 19.

[0046] The output end of pump body 6 is connected to the inlet end of main oil pipe 12. Temperature sensor 2 14, viscosity sensor 2 15 and filter 8 are connected to the main oil pipe 12 near pump body 6. The sensors are used to detect the viscosity and temperature of hydraulic oil when it leaves oil tank 3. Filter 8 is used to filter impurities in hydraulic oil to prevent impurities from damaging the pipes and lifting cylinder 2.

[0047] Multiple flow control valves are installed on the main oil pipe 12 to branch multiple branch pipes. Each branch pipe is connected to the inlet end of a different oil inlet pipe 18. The outlet end of the oil inlet pipe 18 is inserted into the interior of the demolding machine 1. The outlet end of the oil inlet pipe 18 is connected to a solenoid directional valve 20. Temperature sensor 3 21 and viscosity sensor 3 22 are connected to the oil inlet pipe 18 near the solenoid directional valve 20.

[0048] The outlet end of the electromagnetic reversing valve 20 is connected to the electromagnetic reversing valve 23 and the return box 24 respectively. The return box 24 is located outside the demolding machine 1. The pump body 4 (not shown in the figure) is installed inside the return box 24. The return box 24 is connected to the electromagnetic reversing valve 9 via pipeline.

[0049] Solenoid directional valve 20 and solenoid directional valve 23 are both installed inside the demolding machine 1. The output end of solenoid directional valve 23 is connected to oil pipe 16 and oil pipe 27.

[0050] Oil port 25 is provided on the shaft away from the output end of lifting cylinder 2, and oil port 26 is provided on the shaft near the output end of lifting cylinder 2. Oil pipe 16 and oil pipe 27 are respectively connected to oil port 25 and oil port 26 to deliver hydraulic oil into the cylinder.

[0051] The electromagnetic directional valve 23 is connected to the oil outlet pipe 19. Multiple diversion valves are installed on the main oil pipe 23 to divide the main oil pipe 23 into multiple branch pipes. Each branch pipe is connected to the oil outlet pipe 19. The output end of the main oil pipe 23 is connected to the oil tank 3. The diversion valves are used to ensure that the flow rate of hydraulic oil in each branch pipe of the main oil pipe 12 and the main oil pipe 23 is the same.

[0052] The hydraulic assembly includes hydraulic pressure sensor 1 27, overflow valve 28, accumulator 29, throttle valve 30, hydraulic pressure sensor 2 31, hydraulic pressure sensor 32, hydraulic pressure sensor 4 33, and hydraulic pressure sensor 5 34.

[0053] Oil pressure sensor 27 is installed inside oil tank 3. Overflow valve 28 is connected to the output end of pump body 6 through main oil pipe 12. Accumulator 29 is connected in parallel on the main oil pipe 12 between overflow valve 28 and viscosity sensor 15. Oil pressure sensor 32 is connected to the downstream main oil pipe 12 of the parallel interface of accumulator 29. Accumulator 29 is used to absorb and compensate for instantaneous fluctuations in oil pressure. The working principle is based on existing technology.

[0054] Throttle valve 30 and oil pressure sensor 2 31 are connected in series between solenoid directional valve 20 and solenoid directional valve 3 23 to ensure that the amount of oil flowing into each group of lifting cylinders 2 is the same, thereby ensuring that the working stroke of the lifting cylinders 2 is the same and effectively improving production accuracy. There are two sets of oil pressure sensor 4 33, which are symmetrically set on oil pipe 1 16 and oil pipe 2 17 respectively, to detect the working oil pressure of the lifting cylinder 2. Oil pressure sensor 5 34 is connected in series on the oil outlet pipe 19 to detect the oil outlet pressure.

[0055] The hydraulic control components include the following usage methods:

[0056] Method 1: When the demolding machine 1 is working, the hydraulic control component is activated, thereby driving the output end of the lifting cylinder 2 to move up and down, thus achieving demolding.

[0057] Method 2: Use various viscosity sensors and temperature sensors to detect the state of the hydraulic oil and ensure stable hydraulic oil pressure.

[0058] Method 3: The load of demolding machine 1 varies with the different specifications of the product. Based on Method 1 and Method 2, the working conditions and hydraulic oil parameters of demolding machine 1 can be dynamically adjusted.

[0059] Specifically, Method 1 includes the following steps:

[0060] Pump body 6 draws hydraulic oil from oil tank 3 and delivers it into main oil pipe 12. The hydraulic oil flows through the branch pipes of main oil pipe 12 into inlet pipe 18. Electromagnetic directional valve 20 and electromagnetic directional valve 3 23 connect inlet pipe 18 and oil pipe 16, so that hydraulic oil flows into lifting cylinder 2 through oil port 25, thereby driving the output end of lifting cylinder 2 to extend outward.

[0061] When it is necessary to control the retraction of the output end of the lifting cylinder 2, the electromagnetic reversing valve 23 connects the oil pipe 17 and the inlet pipe 18, and connects the oil pipe 16 and the outlet pipe 19. At this time, the hydraulic oil flows through the oil pipe 17 and the oil port 26 into the lifting cylinder 2, thereby pushing the output end to retract inward. The output end pushes the original hydraulic oil inside the lifting cylinder 2 to be discharged from the oil port 25, and flows through the oil pipe 16 and the electromagnetic reversing valve 23 into the outlet pipe 19. It then flows further along the outlet pipe 19 into the main oil pipe 13, and finally returns to the oil tank 3. The electromagnetic reversing valve 23 is used to switch the direction of hydraulic oil delivery, forming the hydraulic oil circuit when the demolding machine 1 is working.

[0062] Method 2 includes the following steps:

[0063] Step 1: Use temperature sensor 4 and viscosity sensor 5 to detect the temperature and viscosity of the hydraulic oil inside the oil tank 3, and use the temperature control component to regulate the temperature of the hydraulic oil inside the oil tank 3.

[0064] Specifically, in hydraulic equipment, the ideal working temperature of hydraulic oil is 45 to 55 degrees Celsius. Sensors are used to detect and ensure that the temperature and viscosity of the hydraulic oil inside the oil tank 3 are within the ideal range. When the temperature rises, the viscosity of the hydraulic oil decreases, resulting in insufficient thrust of the lifting cylinder 2, which is difficult to meet the thrust required by the demolding machine 1. When the temperature drops, the viscosity of the hydraulic oil increases, resulting in oil circuit blockage, delayed response, and reduced work efficiency. Therefore, the temperature of the hydraulic oil inside the oil tank 3 is regulated by a temperature control component.

[0065] Pump body 2 7 is started, and pump body 2 7 draws hydraulic oil from oil tank 3 into solenoid directional valve 9. Solenoid directional valve 9 determines the connection direction of the pipeline based on the detection result of temperature sensor 4. When viscosity sensor 5 detects that the viscosity of hydraulic oil is lower than the ideal range, it indicates that the oil temperature is high. Therefore, solenoid directional valve 9 connects to oil cooler 11, allowing hydraulic oil to flow into oil cooler 11 for cooling. When viscosity sensor 5 detects that the viscosity is higher than the ideal viscosity range, it indicates that the oil temperature is low. Therefore, solenoid directional valve 9 connects to heater 10, allowing low-temperature hydraulic oil to flow into heater 10 for heating, restoring the hydraulic oil viscosity to the optimal working temperature range. The hydraulic oil with restored viscosity is then transported back to oil tank 3. By regulating the hydraulic oil temperature, the viscosity of the hydraulic oil is regulated, reducing the working error of demolding machine 1 caused by viscosity.

[0066] Furthermore, the viscosity of hydraulic oil is not only affected by temperature; oil aging and high impurity content also affect its viscosity. Therefore, based on the above working principle, combined with the detection data of temperature sensor 4, the true cause of the hydraulic oil viscosity change is determined. If the actual detection result of temperature sensor 4 matches the analysis result of viscosity sensor 5, it indicates that the temperature change causes viscosity fluctuations, and the temperature control component is used for adjustment. If the temperature sensor 4 passes the test, it indicates that the problem lies with the physical defects of the hydraulic oil itself, and the hydraulic oil should be replaced. For example, when viscosity sensor 5 detects that the viscosity is greater than the ideal viscosity range, viscosity sensor 5 analyzes that the oil temperature is low, leading to an increase in hydraulic oil viscosity. However, temperature sensor 4 detects that the oil temperature is within the normal range. The analysis result of viscosity sensor 5 conflicts with the detection result of temperature sensor 4, indicating that the increase in hydraulic oil viscosity is due to hydraulic oil aging and is unrelated to temperature. Cross-validation is achieved using viscosity sensor 5 and temperature sensor 4 to improve the accuracy of the detection results.

[0067] Step 2: Using temperature and viscosity sensors installed outside the oil tank 3, the viscosity of the hydraulic oil changes during the process of being transported from the oil tank 3 to the lifting cylinder 2. The return box 24 and temperature control components are used to adjust the oil temperature to compensate for the temperature loss during the hydraulic oil transportation, thereby ensuring that the viscosity fluctuation is within the ideal range.

[0068] Specifically, based on the hydraulic oil delivery method of Method 1, viscosity sensor 215 and temperature sensor 214 are used to detect and record the viscosity and temperature of the hydraulic oil when it is drawn from the oil tank 3. Temperature sensor 321 and viscosity sensor 322 are used to detect and record the viscosity and temperature of the hydraulic oil before it is delivered into the lifting cylinder 2. By comparing the detection data of each set of temperature sensors and each set of viscosity sensors, the heat loss and viscosity change of the hydraulic oil during the delivery process can be obtained.

[0069] Furthermore, based on the detection results of the temperature sensor 21, the second electromagnetic directional valve 20 adjusts the connection of the oil inlet pipe 18. When the viscosity of the hydraulic oil meets the requirements, the second electromagnetic directional valve 20 connects to the first oil pipe 16, allowing the hydraulic oil to be delivered into the lifting cylinder 2. If the viscosity of the hydraulic oil exceeds the ideal temperature range, in order to avoid damage to the demolding machine 1 and the product to be demolded by the unqualified hydraulic oil, the second electromagnetic directional valve 20 connects to the return box 24. The hydraulic oil flows into the return box 24 and is further delivered by the pump body 4 through the first electromagnetic directional valve 9 to enter the temperature control component for temperature regulation.

[0070] The temperature control component combines the data from temperature sensor 14 and temperature sensor 21 to perform temperature control on the returning hydraulic oil, adjust the initial temperature of the hydraulic oil in the oil tank 3, thereby adjusting the initial viscosity of the hydraulic oil, compensating for the heat loss of the hydraulic oil during the transportation process, and eliminating the viscosity change caused by temperature changes, thus ensuring that the temperature of the hydraulic oil flowing into the lifting cylinder 2 is within the ideal temperature range.

[0071] Step 3: Based on Step 2, the hydraulic oil pressure in the circuit module is adjusted by the hydraulic component to establish a combined control system for oil temperature, viscosity and oil pressure, further ensuring the thrust stability of the lifting cylinder 2 and the safety of the oil circuit.

[0072] Specifically, changes in hydraulic oil temperature primarily affect viscosity changes. Viscosity changes indirectly affect the hydraulic system's ability to build and maintain pressure. As oil temperature rises, hydraulic oil viscosity decreases, leading to increased internal leakage of hydraulic oil in pipelines and lifting cylinder 2. This makes it difficult to build system pressure, manifesting as insufficient pressure, decreased oil temperature, increased hydraulic oil viscosity, and increased difficulty in pumping and delivering hydraulic oil. This results in increased system response time and the generation of abnormally high pressure inside lifting cylinder 2 and pipelines.

[0073] Before pump body 6 starts drawing hydraulic oil, temperature sensor 4, viscosity sensor 5 and oil pressure sensor 27 are used to detect the hydraulic oil inside oil tank 3. When the viscosity and oil pressure are both qualified, pump body 6 draws the hydraulic oil into main oil pipe 12 to supply oil to lifting cylinder 2.

[0074] When the viscosity is not up to standard but the oil pressure is up to standard, the temperature of the hydraulic oil is adjusted using a temperature control component to ensure that the viscosity of the hydraulic oil is up to standard.

[0075] Furthermore, temperature changes directly affect the viscosity of hydraulic oil, which in turn indirectly affects the oil pressure. This causes the oil pressure to exceed the standard value when the viscosity returns to the standard value. At this time, the hydraulic oil is pumped into the relief valve 28 by the pump body 6, and the oil pressure is regulated by the relief valve 28 to limit the oil pressure within the standard range.

[0076] When the viscosity is within acceptable limits but the oil pressure is not, the following situations may occur.

[0077] Scenario 1: The temperature of the hydraulic oil is adjusted by using a temperature control component, thereby indirectly adjusting the oil pressure. After the temperature sensor-4, viscosity sensor-5, and oil pressure sensor-27 all pass the test, the pump body-6 is started to deliver hydraulic oil.

[0078] Scenario 2: Based on Method 1, the indirect method of controlling oil pressure requires ensuring that the temperature and viscosity of the hydraulic oil are always within the standard range. Therefore, hydraulic oil can be pumped into the relief valve 28 through the pump body 6. The relief valve 28 is used to limit the oil pressure within the standard range. Temperature sensor 14, viscosity sensor 15, and oil pressure sensor 32 are used to detect the hydraulic oil flowing through the relief valve 28 to ensure that the data of the hydraulic oil flowing out of the relief valve 28 meets the standard values.

[0079] Step 4: The heat loss of hydraulic oil during the transportation process was detected in Step 2. In Step 3, a combined control system for oil temperature, viscosity and oil pressure was established. By integrating the data from various sensors, the oil temperature, viscosity and oil pressure were ensured to be within the qualified range.

[0080] In conjunction with the hydraulic oil temperature compensation work in step two, the temperature control component, along with data from temperature sensor 14 and temperature sensor 21, is used to control the temperature of the returning hydraulic oil, compensating for heat loss during the transportation process and ensuring the viscosity of the hydraulic oil. Following the working principle in step three, when the hydraulic oil inside tank 3 is tested using temperature sensor 4, viscosity sensor 5, and oil pressure sensor 27, if the temperature, viscosity, and oil pressure are all unqualified, the heat compensation data obtained from temperature sensor 14 and temperature sensor 21 is used to determine whether the oil temperature meets the heat compensation requirements.

[0081] If the oil temperature does not meet the heat compensation requirements, a temperature control component is used to make the oil temperature meet the heat compensation requirements.

[0082] If the heat compensation requirements are met, the hydraulic oil is delivered to the lifting cylinder 2 by the pump body 6. During this process, the viscosity sensor 22 and the temperature sensor 21 are used to detect whether the viscosity and temperature of the hydraulic oil are qualified. If the detection is not qualified, the return box 24 is connected by the solenoid reversing valve 20, so that the hydraulic oil is delivered back to the oil tank 3 for temperature regulation.

[0083] It should be noted that if the hydraulic oil pressure is directly controlled by the overflow valve 28 in method three, the oil pressure may fluctuate due to changes in temperature and viscosity during the transportation process, which may result in the oil pressure in the lifting cylinder 2 being unqualified.

[0084] If the viscosity sensor 22 and temperature sensor 21 pass the test, the solenoid directional valve 20 connects to the solenoid directional valve 23, allowing hydraulic oil to be delivered into the lifting cylinder 2. During this process, the oil pressure is detected by the oil pressure sensor 31. Ideally, when both the oil temperature and viscosity are within acceptable limits, the oil pressure is also within acceptable limits, and the hydraulic oil can smoothly enter the lifting cylinder 2 to work.

[0085] If the hydraulic pressure sensor 31 detects that the hydraulic pressure is unqualified, the flow rate of the hydraulic oil is adjusted by the throttle valve 30, thereby indirectly regulating the hydraulic pressure to ensure that the hydraulic pressure meets the working requirements.

[0086] By combining the temperature, viscosity, and oil pressure data from steps two and three, the standard temperature, viscosity, and oil pressure of the lifting cylinder 2 under the target working state can be obtained, providing real and reliable data for optimizing the hydraulic system.

[0087] Step 5: When the electromagnetic reversing valve 23 switches the oil circuit, the change in the flow direction of the hydraulic oil will cause instantaneous fluctuations in the main oil pipe 12 and the main oil pipe 23. The accumulator 29 absorbs and compensates for the fluctuations to ensure the stability of the oil pressure, further improve the smoothness of the lifting cylinder 2, and improve the working accuracy of the demolding machine 1.

[0088] Specifically, the accumulator 29 can be a bladder-type accumulator commonly used in industrial hydraulic systems. When the hydraulic system supplies oil stably, the hydraulic oil in the main oil pipe 12 squeezes the bladder of the accumulator 29, compressing the gas inside the bladder to store energy. When the oil pressure is stable, the accumulator 29 is in a balanced state. When the solenoid directional valve 23 switches the oil circuit, the flow direction of the hydraulic oil changes abruptly, and the hydraulic oil in the main oil pipe 12 and the main oil pipe 23 experiences instantaneous fluctuations. When the oil pressure is higher than the stable value, the hydraulic oil flows further into the accumulator 29, continuing to squeeze the bladder, thereby using the bladder to absorb high-pressure energy and balance the oil pressure. When the oil pressure is lower than the stable value, the bladder rebounds and expands, quickly squeezing the hydraulic oil inside the accumulator 29 back to the main oil pipe 12, instantly replenishing the oil pressure and achieving oil pressure balance.

[0089] Method 3 includes the following steps:

[0090] Step 1: Working condition identification. By checking the switching status of the electromagnetic reversing valve 23, the extension and retraction of the lifting cylinder 2 is determined to avoid misjudgment. Combined with the actual detection data of the hydraulic pressure sensor 31 and hydraulic pressure sensor 33 in Step 3, the load status of the demolding machine 1 is determined.

[0091] When the oil pressure sensor 33 detects that the oil pressure is continuously higher than the standard value, and the solenoid directional valve 23 determines that the lifting cylinder 2 is in the extended state, it is judged as a high load condition.

[0092] When the oil pressure sensor 33 detects that the oil pressure is continuously lower than the standard value and the switching frequency of the solenoid directional valve 23 is lower than the standard value, it is judged as a low load condition. The switching frequency of the solenoid directional valve 23 is determined by the specific demolding product.

[0093] The rest are normal load conditions.

[0094] Step 2: Based on the working condition test results in Step 1, combined with the temperature compensation in Step 2 of Method 2, the oil pressure regulation in Step 3 of Method 2, and the accumulator 29 fluctuation compensation in Step 5, adjust the hydraulic oil parameters within a reasonable range.

[0095] Specifically, under heavy load conditions, the working logic of the combined control system for oil temperature, viscosity and oil pressure in steps three and four of Method Two is combined to first ensure that the viscosity of the hydraulic oil is adapted to the requirements of heavy load conditions. Then, the flow rate and oil pressure of the hydraulic oil in the pipeline are adjusted to be close to the upper limit of the standard range through the overflow valve 28 and the throttle valve 30 to ensure that the lifting cylinder 2 can generate sufficient thrust.

[0096] Under light load conditions, while ensuring viscosity compatibility, and based on the data from each group of sensors, the flow rate and oil pressure of hydraulic oil in the pipeline are adjusted to be close to the lower limit of the standard range through the overflow valve 28 and the throttle valve 30, thereby reducing energy consumption.

[0097] Step 3: During the working condition adaptation and adjustment process, the real-time data obtained from the detection in Steps 2 and 3 of Method 2 is compared with the standard parameters of the current working condition. If a deviation occurs, dynamic adjustment is performed using the return box 24, temperature control component, overflow valve 28, and throttle valve 30 to quickly restore the hydraulic oil parameters to the standard range, forming a closed-loop control system from detection to adjustment to feedback to detection to adjustment, further improving the working efficiency of the hydraulic control system.

[0098] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0099] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic control system for a lifting cylinder of a demolding machine, comprising a demolding machine (1) and a hydraulic control assembly, characterized in that: The demolding machine (1) includes multiple sets of lifting cylinders (2), and the hydraulic control component includes an oil tank module and a circuit module; The circuit module connects the oil tank module to the lifting cylinder (2). The oil tank module includes an oil tank (3). The oil tank (3) is equipped with a temperature sensor (4) and a viscosity sensor (5). A pump body (6) is installed on the outside of the oil tank (3). The oil inlet of the pump body (6) is connected to the pipeline of the oil tank (3). The oil outlet of the pump body (6) is connected to the circuit module. The oil tank (3) is provided with a pump body (7), a temperature control component and an oil pressure component on one side; The line module includes main oil pipe one (12), main oil pipe two (13), oil pipe one (16), oil pipe two (17), oil inlet pipe (18) and oil outlet pipe (19). The temperature control assembly includes an electromagnetic reversing valve (9), a heater (10), and an oil cooler (11). The two ends of the pump body (7) are respectively connected to the electromagnetic reversing valve (9) and the oil tank (3) pipelines. The inlet ends of the heater (10) and the oil cooler (11) are respectively connected to the electromagnetic reversing valve (9) pipelines. The outlet ends of the heater (10) and the oil cooler (11) are both connected to the oil tank (3). The output end of the pump body (6) is connected to the inlet end of the main oil pipe (12). The main oil pipe (12) is connected to the pipe near the pump body (6) with a temperature sensor (14), a viscosity sensor (15) and a filter (8). Multiple flow valves are installed on the main oil pipe (12) to divide the main oil pipe (12) into multiple branch pipes. Each branch pipe is connected to the inlet end of a different group of oil inlet pipes (18). The outlet end of the oil inlet pipe (18) is inserted into the interior of the demolding machine (1). The outlet end of the oil inlet pipe (18) is connected to a solenoid valve (20). The oil inlet pipe (18) is connected to a temperature sensor (21) and a viscosity sensor (22) near the solenoid valve (20). The outlet end of the electromagnetic reversing valve two (20) is respectively connected to the electromagnetic reversing valve three (23) and the return box (24). The return box (24) is located outside the demolding machine (1). The return box (24) is equipped with a pump body four inside. The return box (24) is connected to the electromagnetic reversing valve one (9) via pipeline. The electromagnetic reversing valve two (20) and the electromagnetic reversing valve three (23) are both installed inside the demolding machine (1). The output end of the electromagnetic reversing valve three (23) is connected to the oil pipe one (16) and the oil pipe two (17). An oil port 1 (25) is provided on the shaft away from the output end of the lifting cylinder (2), and an oil port 2 (26) is provided on the shaft close to the output end of the lifting cylinder (2). The oil pipe 1 (16) and the oil pipe 2 (17) are respectively connected to the oil port 1 (25) and the oil port 2 (26) pipelines.

2. The hydraulic control system for the lifting cylinder of a demolding machine according to claim 1, characterized in that: The electromagnetic reversing valve three (23) is connected to the oil outlet pipe (19). Multiple groups of flow valves are installed on the main oil pipe two (13) to divide the main oil pipe two (13) into multiple branch pipes. Each group of branch pipes is connected to the oil outlet pipe (19). The output end of the main oil pipe two (13) is connected to the oil tank (3). The oil pressure assembly includes oil pressure sensor one (27), overflow valve (28), accumulator (29), throttle valve (30), oil pressure sensor two (31), oil pressure sensor three (32), oil pressure sensor four (33), and oil pressure sensor five (34).

3. The hydraulic control system for the lifting cylinder of a demolding machine according to claim 2, characterized in that: The first oil pressure sensor (27) is installed inside the oil tank (3). The overflow valve (28) is connected to the output end of the first pump body (6) through the first main oil pipe (12). The accumulator (29) is connected in parallel on the first main oil pipe (12) between the overflow valve (28) and the second viscosity sensor (15). The third oil pressure sensor (32) is connected to the main oil pipe (12) downstream of the parallel interface of the accumulator (29). The throttle valve (30) and the second oil pressure sensor (31) are connected in series between the second electromagnetic reversing valve (20) and the third electromagnetic reversing valve (23). There are two sets of the fourth oil pressure sensor (33). The two sets of the fourth oil pressure sensor (33) are symmetrically arranged on the first oil pipe (16) and the second oil pipe (17), respectively. The fifth oil pressure sensor (34) is connected in series on the outlet pipe (19).

4. The hydraulic control system for the lifting cylinder of a demolding machine according to claim 3, characterized in that: The hydraulic control system includes the following usage methods: Method 1: When the demolding machine (1) is working, the hydraulic control component is activated, thereby driving the output end of the lifting cylinder (2) to perform lifting and lowering movements to achieve demolding; Method 2: Use various viscosity sensors and temperature sensors to detect the state of the hydraulic oil and ensure stable hydraulic oil pressure; Method 3: The load of the demolding machine (1) varies with the different specifications of the product. Based on Method 1 and Method 2, the working conditions and hydraulic oil parameters of the demolding machine (1) can be dynamically adjusted.

5. The hydraulic control system for the lifting cylinder of a demolding machine according to claim 4, characterized in that: Method 2 includes the following steps: Step 1: Use the temperature sensor (4) and the viscosity sensor (5) to detect the temperature and viscosity of the hydraulic oil inside the oil tank (3), and use the temperature control component to regulate the temperature of the hydraulic oil inside the oil tank (3); Step 2: Use the temperature sensors and viscosity sensors set outside the oil tank (3) to detect the viscosity change of hydraulic oil during the process of transporting hydraulic oil from the oil tank (3) to the lifting cylinder (2), and use the return box (24) and temperature control components to adjust the oil temperature to make up for the temperature loss during hydraulic oil transportation, thereby ensuring that the viscosity fluctuation is within the ideal range. Step 3: Based on Step 2, the hydraulic oil pressure in the circuit module is adjusted by the hydraulic pressure component to establish a combined control system for oil temperature, viscosity and oil pressure, so as to further ensure the thrust stability and oil circuit safety of the lifting cylinder (2); Step 4: The heat loss of hydraulic oil during the transportation process was detected in Step 2. In Step 3, a combined control system for oil temperature, viscosity and oil pressure was established. The data from each group of sensors were integrated to ensure that the oil temperature, viscosity and oil pressure were all within the qualified range. Step 5: When the electromagnetic reversing valve three (23) switches the oil circuit, the change in the flow direction of the hydraulic oil will cause instantaneous fluctuations in the main oil pipe one (12) and the main oil pipe two (13). The accumulator (29) absorbs and compensates for the fluctuations to ensure the stability of the oil pressure, further improve the smoothness of the operation of the lifting cylinder (2), and improve the working accuracy of the demolding machine (1).

6. The hydraulic control system for the lifting cylinder of a demolding machine according to claim 4, characterized in that: Method 3 includes the following steps: Step 1: Working condition identification. By checking the switching state of the electromagnetic reversing valve three (23), the extension and retraction of the lifting cylinder (2) is determined to avoid misjudgment. Combined with the real detection data of the oil pressure sensor two (31) and the oil pressure sensor four (33) in step 3, the load state of the demolding machine (1) is determined. Step 2: Based on the working condition test results in Step 1, combined with the temperature compensation in Step 2 of Method 2, the oil pressure regulation in Step 3 of Method 2, and the accumulator (29) fluctuation compensation in Step 5, adjust the parameters of the hydraulic oil within a reasonable range; Step 3: During the working condition adaptation and adjustment process, the real-time data obtained from the detection in Step 2 and Step 3 of Method 2 is compared with the standard parameters of the current working condition. If a deviation occurs, the return box (24), temperature control component, overflow valve (28) and throttle valve (30) are used for dynamic adjustment so that the parameters of the hydraulic oil can be quickly restored to the standard range, forming a closed-loop control system from detection to adjustment to feedback to detection to adjustment, further improving the working efficiency of the hydraulic control system.

Images