Die-casting control system for removing proportional valve

Abstract

The embodiment of the utility model discloses a pressure casting control system without a proportional valve. The pressure casting control system comprises a pressure casting machine system oil way, a pressure relief electromagnetic valve, a pressure casting machine oil tank, a power source set, a pressure casting machine oil pressure sensing module and a driver. The pressure relief electromagnetic valve, the die-casting machine oil tank, the power source set and the die-casting machine oil pressure sensing module are connected with an oil way of the die-casting machine system. The pressure relief electromagnetic valve and the die-casting machine oil pressure sensing module are connected with the driver, and the power source set is connected with the driver. By implementing the system provided by the embodiment of the utility model, the energy-saving rate of the die-casting machine can be improved, the cost is reduced, the overshoot phenomenon of the die-casting machine is effectively inhibited, the overall overshoot and operation noise of the system are reduced, the service life of the die-casting machine is prolonged, and the control effect of the die-casting machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die-casting control systems, in particular to a die-casting control system with a proportional valve removed. Background Art

[0002] Die casting machine is a machine used for pressure casting. It includes hot press chamber and cold press chamber. Later, it was divided into two types: vertical and horizontal. The die casting machine hydraulically injects molten metal into the mold under pressure and cools it into shape. After the mold is opened, a solid metal casting can be obtained. It was originally used for die casting lead type.

[0003] The existing die-casting machine control system generally has the following three modes. The first is to use proportional valves and current valves for pressure control in a mains power environment. The second is to use proportional valves, encoders, pressure sensors, etc. for joint pressure control when the frequency converter and servo drive control the synchronous motor. The third is to use proportional valves, pressure sensors, etc. for joint pressure control when the frequency converter and servo drive control the asynchronous motor. However, the above three modes each have certain disadvantages. The first mode has low energy saving rate, high noise, high motor and oil temperature, and high motor damage rate; the second mode has high cost, complex synchronous motor supporting system, and difficult debugging; the third mode requires the use of proportional valve joint control to remove the high overshoot of the proportional valve, which is easy to damage the machine; generally, a single-stage PID (Proportional Integral Derivative) is used for pressure increase and voltage stabilization, which has poor control effect and is easy to overshoot.

[0004] Therefore, it is necessary to design a new system to improve the energy saving rate of the die-casting machine, reduce costs, effectively suppress the overshoot phenomenon of the die-casting machine, reduce the overall overshoot and operating noise of the system, and improve the service life and control effect of the die-casting machine. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a die-casting control system without a proportional valve.

[0006] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions: providing a die-casting control system that removes a proportional valve, including: a die-casting machine system oil circuit, a pressure relief solenoid valve, a die-casting machine oil tank, a power source group, a die-casting machine oil pressure sensing module and a driver; the pressure relief solenoid valve, the die-casting machine oil tank, the power source group and the die-casting machine oil pressure sensing module are respectively connected to the die-casting machine system oil circuit; the pressure relief solenoid valve and the die-casting machine oil pressure sensing module are respectively connected to the driver, and the power source group is connected to the driver.

[0007] A further technical solution is as follows: the pressure relief solenoid valve comprises a solenoid valve and a return pipe; the solenoid valve is connected to the driver, and the return pipe is connected to the oil circuit of the die-casting machine system.

[0008] A further technical solution is: the power source group includes an oil pump motor group.

[0009] Its further technical solution is: the oil pump motor group includes a high-pressure pump motor group, a high-pressure oil pump group, a low-pressure pump motor group and a low-pressure oil pump group; the high-pressure pump motor group and the low-pressure pump motor group are respectively connected to the driver; the high-pressure oil pump group and the low-pressure oil pump group are respectively connected to the oil circuit of the die-casting machine system.

[0010] A further technical solution is: the driver includes an asynchronous servo driver.

[0011] A further technical solution is: the asynchronous servo driver is provided with a control terminal, and the control terminal is connected to the solenoid valve.

[0012] A further technical solution is that the asynchronous servo driver is also connected to a braking resistor.

[0013] A further technical solution is: the die-casting machine oil pressure sensing module includes an oil pressure sensor.

[0014] The beneficial effects of the utility model compared with the prior art are as follows: the utility model adopts an asynchronous servo driver to reduce the proportional valve by setting the die-casting machine system oil circuit, pressure relief solenoid valve, die-casting machine oil tank, power source group, die-casting machine oil pressure sensor module and driver, thereby reducing the cost; and adopts a two-stage PID control method to replace the proportional valve for pressure control, thereby effectively suppressing the overshoot phenomenon of the die-casting machine; when the pressure rises and approaches the corresponding set pressure, the oil pump motor group decelerates through PID switching to reduce the overshoot and operating noise of the whole system, thereby improving the service life and control effect of the die-casting machine.

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic block diagram of a die-casting control system without a proportional valve provided in an embodiment of the utility model;

[0018] Description of the symbols in the figure:

[0019] 1. Die-casting machine system oil circuit; 2. Pressure relief solenoid valve; 3. Die-casting machine oil tank; 4. Power source group; 5. Die-casting machine oil pressure sensor module; 6. Driver. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0022] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0023] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] See also Figure 1 , Figure 1 A schematic block diagram of a die-casting control system without a proportional valve provided in an embodiment of the utility model can be used in the use scenarios of a die-casting machine to improve the energy saving rate of the die-casting machine, reduce costs, effectively suppress the overshoot phenomenon of the die-casting machine, reduce the overall overshoot and operating noise of the system, and improve the service life and control effect of the die-casting machine.

[0025] See also Figure 1The above-mentioned die-casting control system without a proportional valve includes: a die-casting machine system oil circuit 1, a pressure relief solenoid valve 2, a die-casting machine oil tank 3, a power source group 4, a die-casting machine oil pressure sensing module 5 and a driver 6; the pressure relief solenoid valve 2, the die-casting machine oil tank 3, the power source group 4 and the die-casting machine oil pressure sensing module 5 are respectively connected to the die-casting machine system oil circuit 1; the pressure relief solenoid valve 2 and the die-casting machine oil pressure sensing module 5 are respectively connected to the driver 6, and the power source group 4 is connected to the driver 6.

[0026] In this embodiment, the driver 6 mentioned above includes an asynchronous servo driver 6 .

[0027] The above die casting control system has the following four working modes:

[0028] The first mode: When the system has no set pressure and flow, and the current oil pump pressure is zero, the die-casting machine system oil circuit 1, the die-casting machine oil tank 3, the pressure relief solenoid valve 2, and the oil pump motor unit are not working, the asynchronous servo driver 6 is powered on and operates to maintain the bottom flow state, the oil pressure sensor module feedback voltage signal is basically zero, and no pressure relief signal is given in the system.

[0029] The second mode: when the system has no set pressure and flow, and the current oil pump pressure is not zero, the die-casting machine system oil circuit 1, the die-casting machine oil tank 3, and the oil pump motor unit are not working, and the oil pressure sensor module has a certain amount of voltage feedback signal output to the control terminal of the asynchronous servo driver 6, sending out a pressure relief signal, and the pressure relief solenoid valve 2 operates. The oil in the die-casting machine system oil circuit 1 is depressurized through the return oil pipe, and the actual system pressure drops to zero.

[0030] The third mode: when the system sets the pressure and flow, and the current oil pump pressure is zero or lower than the set pressure, the asynchronous servo driver 6 controls the oil pump motor group according to the feedback pressure of the oil pressure sensor module and the target pressure, and the speed regulation strategy is the joint control of the flow and the two-stage PID to achieve a rapid increase in pressure. After reaching the stable pressure, PID is used for voltage stabilization control. At this time, when the die-casting machine system oil circuit 1 is connected to the high-pressure oil pump group, the die-casting machine is in the stroke state to realize the opening and closing of the mold. When the die-casting machine system oil circuit 1 is connected to the low-pressure oil pump group, the die-casting machine is in the injection state to realize the injection of the injection machine.

[0031] The fourth mode: When the system sets the pressure and flow, and the current oil pump pressure is too high, the asynchronous servo driver 6 realizes deceleration braking through the braking resistor, but the pressure relief solenoid valve 2 cannot be opened to relieve pressure. The motor of the oil pump motor group is controlled to decelerate, and the deceleration speed is controlled by the flow of the asynchronous servo driver 6 and the speed regulation strategy of the combined control of the two-stage PID.

[0032] The above-mentioned die-casting control system can accurately control the operating state of the oil pump motor group according to needs in different working modes, avoid unnecessary energy consumption, and thus achieve energy-saving effects. Through the joint control of components such as the asynchronous servo driver 6, the oil pressure sensor module and the target pressure setting, accurate control of pressure and flow can be achieved, improving the stability of the production process and product quality. The die-casting control system can quickly adjust the operating state of the oil pump motor group according to the set pressure and flow requirements, so as to achieve a rapid rise to a stable pressure and perform voltage stabilization control, thereby improving production efficiency. Through real-time monitoring and control of the oil pump pressure, the system can decelerate and brake in time, and achieve pressure relief when necessary, ensuring the safety and reliability of equipment operation.

[0033] In general, this die-casting control system without proportional valves has advantages in energy saving, precise control, efficient operation, safety and reliability, which helps to improve production efficiency and production environment.

[0034] In one embodiment, the pressure relief solenoid valve 2 comprises a solenoid valve and a return pipe; the solenoid valve is connected to the driver 6, and the return pipe is connected to the oil circuit 1 of the die casting machine system.

[0035] The driver 6 controls the opening or closing of the electromagnetic valve, thereby controlling the opening and closing of the return pipe.

[0036] In one embodiment, the power source group 4 includes an oil pump motor group.

[0037] In one embodiment, the above-mentioned oil pump motor group includes a high-pressure pump motor group, a high-pressure oil pump group, a low-pressure pump motor group and a low-pressure oil pump group; the high-pressure pump motor group and the low-pressure pump motor group are respectively connected to the driver 6; the high-pressure oil pump group and the low-pressure oil pump group are respectively connected to the die-casting machine system oil circuit 1.

[0038] Specifically, by dividing the oil pump motor group into two parts, high pressure and low pressure, the oil supply and pressure of the high pressure oil circuit and the low pressure oil circuit can be controlled respectively according to different working modes and requirements, and accurate graded oil supply can be achieved, thereby improving the flexibility and applicability of the system. The high pressure pump motor group and the low pressure pump motor group are connected to the driver 6, and the accurate speed regulation and control of the oil pump motor group can be achieved through the control of the asynchronous servo driver 6, thereby improving the stability and reliability of the system. By controlling the oil supply of the high pressure and low pressure oil pumps respectively according to the requirements, unnecessary energy waste can be avoided and the purpose of energy saving can be achieved. At the same time, through the precise control of the driver 6, energy loss can be reduced and the energy efficiency of the system can be improved. The high pressure oil pump group and the low pressure oil pump group are respectively connected to the die casting machine system oil circuit 1, and the oil supply ratio and pressure of the high pressure and low pressure can be flexibly adjusted according to the specific process and requirements to adapt to different die casting process requirements and improve production efficiency and product quality.

[0039] In one embodiment, the asynchronous servo driver 6 is provided with a control terminal, and the control terminal is connected to the solenoid valve.

[0040] In one embodiment, the asynchronous servo driver 6 is further connected to a braking resistor.

[0041] In one embodiment, the die-casting machine oil pressure sensing module 5 includes an oil pressure sensor.

[0042] Specifically, the above-mentioned die-casting control system uses an asynchronous servo driver 6 for pressure control throughout the process, so the cost of the technical solution can be reduced by reducing the proportional valve, and the overshoot phenomenon of the die-casting machine is effectively suppressed by adopting a two-stage PID control method. When the pressure rises and approaches the corresponding set pressure, the motor decelerates through the PID algorithm. Compared with the solution of using a proportional valve to control the actual pressure in the prior art, the die-casting control system of this embodiment reduces the oil pressure leaked when the proportional valve regulates the pressure, so that there is basically no leakage and waste of oil pressure when the pressure of the die-casting machine rises, which improves the energy saving rate of the die-casting machine and reduces the cost of the system solution.

[0043] In this embodiment, the flow signal and two-stage PID are used for control. In the low-pressure and slow-speed stage of the die-casting machine to ensure personal safety and mechanical safety, the motor frequency will not continue to rise with the PID adjustment, but will be limited by the flow limit signal.

[0044] The die-casting control system of this embodiment can be applied to the modification and matching of some die-casting machine control systems.

[0045] In this embodiment, the die-casting control system without the proportional valve has the following safety aspects: equipment safety and personnel safety, specifically, the equipment is controlled by flow signals, the system is controlled, and the safety is strong; in terms of quality: while saving energy, the defective rate of produced products is low and the qualified finished product rate is high; in terms of efficiency: while saving energy, the production efficiency is not reduced, the production cycle is stable, and the economic benefits of equipment production are guaranteed; in terms of energy saving: there is basically no oil pressure leakage, the pressure rises quickly, the voltage stabilization frequency is low during voltage stabilization, and the energy saving effect is high.

[0046] The above-mentioned die-casting control system that removes the proportional valve, by setting the die-casting machine system oil circuit 1, the pressure relief solenoid valve 2, the die-casting machine oil tank 3, the power source group 4, the die-casting machine oil pressure sensor module 5 and the driver 6, adopts the asynchronous servo driver 6 for pressure control to reduce the proportional valve, thereby reducing the cost, and adopts the two-stage PID control method to replace the proportional valve for pressure control, thereby effectively suppressing the overshoot phenomenon of the die-casting machine. When the pressure rises and approaches the corresponding set pressure, the oil pump motor group is decelerated through PID switching to reduce the overall overshoot and operating noise of the system, thereby improving the service life and control effect of the die-casting machine.

[0047] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A die casting control system without a proportional valve, characterized in that: include: The die-casting machine system oil circuit, the pressure relief solenoid valve, the die-casting machine oil tank, the power source group, the die-casting machine oil pressure sensing module and the driver; the pressure relief solenoid valve, the die-casting machine oil tank, the power source group and the die-casting machine oil pressure sensing module are respectively connected to the die-casting machine system oil circuit; the pressure relief solenoid valve and the die-casting machine oil pressure sensing module are respectively connected to the driver, and the power source group is connected to the driver; The pressure relief solenoid valve comprises a solenoid valve and a return pipe; the solenoid valve is connected to the driver, and the return pipe is connected to the oil circuit of the die casting machine system; The power source group includes an oil pump motor group.

2. A die-casting control system without a proportional valve according to claim 1, characterized in that: The oil pump motor group includes a high-pressure pump motor group, a high-pressure oil pump group, a low-pressure pump motor group and a low-pressure oil pump group; the high-pressure pump motor group and the low-pressure pump motor group are respectively connected to the driver; the high-pressure oil pump group and the low-pressure oil pump group are respectively connected to the oil circuit of the die-casting machine system.

3. A die-casting control system without a proportional valve according to claim 1, characterized in that: The drive comprises an asynchronous servo drive.

4. A die-casting control system without a proportional valve according to claim 3, characterized in that: The asynchronous servo driver is provided with a control terminal, and the control terminal is connected to the solenoid valve.

5. A die-casting control system without a proportional valve according to claim 4, characterized in that: The asynchronous servo driver is also connected to a braking resistor.

6. A die-casting control system without a proportional valve according to claim 1, characterized in that: The die-casting machine oil pressure sensing module includes an oil pressure sensor.

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