Test method for linear proportional control of numerical control pressure of Rexroth proportional valves

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

1. The position of the four "flow and pressure limit control" potentiometers on the CPU unit of the computer.

2. The preset parameters adjust the four-stage injection speed to 50 and the pillow pressure to 00

3. Start the oil pump motor, when the temperature of the sol barrel reaches the sol temperature, press the manual glue injection button to make the screw to the end, and see that the oil pressure gauge should indicate a pressure value lower than 20 kg. The pressure can be adjusted with a low-limit control potentiometer, and the pressure can be reduced by counterclockwise rotation.

4. The preset parameters will increase the pillow pressure step by step, and the indication of the oil pressure gauge should be increased proportionally, when the pressure numerical control value pillow pressure pressure reaches 50, 90, the oil pressure gauge should be less than 2.5 kg in error, exceeding the adjustment zui low limit potentiometer.

5. Stop inputting the injection signal, repeat the above steps 2 and 4, and use the numerical control value of injection pressure as a checkpoint. 50 and 99 are commonly used, and when one of the checkpoints 99 reaches the required pressure indication and the pressure indication error of the other checkpoint 50 does not exceed 2.5kgf/cm2 (the required pressure indication), no further adjustment is required. However, when the numerical control value of the injection pressure is 00, the pressure index of the oil pressure gauge should not be higher than 20kgf/cm2, which is generally between 5 and 15kgf/cm2.

6. In order to avoid the long time of adjusting the oil pressure indication in the pillow pressure 99 check point, which causes the oil temperature to overheat or the motor to overload, the thermal relay action and adjustment should be fast and correct. If the heat relay jumps for 2min, after the metal sheet of the heat engine electrical appliance is reset, the numerical control value of the injection pressure is lowered, and then press the reset button of the heat engine electrical appliance to continue to adjust.

7. When adjusting the pillow pressure in 05-10 and 90-99, the oil pressure gauge may not conform to the linear proportion of the pressure indication, which is normal, if the error is not higher than 6kgf/cm2, it does not need to be adjusted.

8. Different types of injection molding machines have different high system pressures. When the high system pressure is 145kgf/cm2, when the numerical control pressure reaches 50, the oil pressure gauge indicates that it should be 72.5kgf/cm2. If the error does not exceed 2.5kgf/cm2, no adjustment is required.

Test method for linear proportional control of numerical control pressure of Rexroth proportional valves

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