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Vertical injection molding machine of vertical injection molding machine with load sensitive variable pump control system

by:Hisson     2020-09-01
Vertical injection molding machine hydraulic system in the work cycle continuously transform speed and pressure, is a typical multi-stage flow pressure control system. At present many quantitative pump + proportion in the domestic equipment flow/pressure combination valve control mode, there are more throttling and overflow loss, power loss is bigger. Vertical injection molding machine factory for the situation, the vertical injection molding machine with load sensitive variable pump control system, simulation with MATLAB/SIMULINK software, and discusses the response time of the three kinds of working conditions, adjusting time, response speed and energy saving effect, etc. 1. Load sensitive variable pump control system working principle of load sensitive variable pump control system working principle diagram. The control system is mainly composed of variable pump and proportional throttle valve, proportional pressure valve, sensitive load, load, throttle valve, two levers of plunger and several damping hole. Flow rate by the proportion of the string in the way of pump's tubing throttle valve adjustment, adjustable throttle valve differential pressure by the end of spring. Due to the power supply can maintain throttle differential pressure at the ends of the certain, so the oil stability. At the same time, because the load stress as a control signal, so the oil pressure also can meet the load requirement. The flow valve opening quantity, pressure regulating valve spring force, external load changes can cause the lever movement, sensitive load caused by the movement of the valve core, valve core displacement will cause pump eccentric quantity change, and flow rate and pressure change, pressure, flow, the change of displacement interactions, constitute a negative feedback process, when they reach the equilibrium, the system will work under steady state. By respectively adjusting input current of proportional valve, proportional pressure valve is, you can get the corresponding flow and pressure. Therefore, this system has the function of the flow, pressure and adapt to. 2. Load sensitive variable pump control system simulation in the system by power bond graph modeling, simulation using MATLAB software. In this system, to adjust the parameter are: pressure valve input current ( The equivalent of vertical injection molding machine pressure changes needed) , load flow area of the throttle valve ( The equivalent of vertical injection molding machine load flow changes needed) 。 Part of the simulation is as follows. ( 1) Input current signal and load the throttle valve flow area are constant value, the equivalent of vertical injection molding machine hydraulic system load did not change the situation. In vertical injection molding machine and mold process ( Load the required pressure and flow rate are constant value) As an example, a constant pressure valve input current value, load throttle valve flow area is a constant value. Start the simulation system, the simulation curve. Shows, the flow and pressure of the pump outlet as the load changes when the required pressure and flow rate, the rise time is about 0. 15 s, adjust the time is about 0. 5s。 ( 2) Input current signal and load the throttle valve flow area are step signal, namely, vertical injection molding machine hydraulic system load the required pressure and flow are instantaneous change. 0 to vertical injection molding machine shot into action. After the 5 s for injection ( Load the required pressure decreases the required flow) As an example, the pressure valve for current step input signal ( Positive step) , the load throttle valve flow area of negative step. Set start time step signal is 0. 5s。 Start the simulation system, the simulation curve. This kind of situation, load the required pressure and flow rate at 0. 5 s has the change, can be seen, of the pump outlet pressure and flow required flow and pressure with the load changes in 0. 5 s began to change, and faster response and adapt to the load change flow rate and pressure are required. ( 3) Input current signal is constant value, load the throttle valve flow area of step signal, the load pressure is constant and the required flow transient changes required. With vertical injection molding machine is 0. After the completion of the 5 s in the holding, for example. Constant pressure valve input current value, load throttle valve flow area of negative step. Set start time step signal is 0. 5 s, start the simulation system, the simulation curve. The variable pump outlet pressure with no major changes needed for the load pressure, pump outlet flow as needed for the load flow in 0. 5 s falling rapidly, the fall time is about 0. 15 s, fast response and adapt to the rapid changes in the required pressure constant load and traffic situation. 3. System simulation results analysis consists of three types of input signal response curve, pump output flow and pressure changing with load the required flow rate and pressure rise time is about 0. 05 ~ 0. 1 s, adjust the time is about 0. 2 to 0. 5s。 When 0. After step 5 s in the input signal, the system response speed faster. Through calculation, and PQ valve ( Quantitative pump + proportional flow/pressure composite valve) Compared to the control system, only in the process of injection molding pressure maintaining this link can be energy saving about 30%. 4. Summary in the end, vertical injection molding machine factory pointed out in this paper the load sensitive variable pump control system of the flow rate - pressure composite adjustment control way, fast response and efficiency higher than traditional control mode. MATLAB/SIMULINK software simulation of the control characteristics of hydraulic system, a module is used when the original mathematical equation, save a large number of programming jobs, and can be clearly observed that the various components in the system of the working parameters and dynamic characteristics, provide convenience for hydraulic system design and test.
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