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Correct setting of core gap of MOOG controller
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2021-04-28

Correct setting of core gap of MOOG controller

The core gap position sensor is used to detect the core position (that is, the piston position of the wall thickness hydraulic cylinder). The effective detection stroke of the core gap position sensor should be slightly larger than the stroke of the wall thickness hydraulic cylinder, and when installed, the strokes of the two are in actual space position can correspond, that is, when the wall thickness hydraulic cylinder piston moves to the end of the hydraulic cylinder stroke, the core gap position sensor should also move to close to the end of the corresponding stroke, that is, the hydraulic cylinder stroke must be valid when the core gap position sensor detects the stroke within range. If installed incorrectly, it may cause the core gap position sensor to not correctly detect the piston position of the wall thickness hydraulic cylinder or cause damage to the core gap position sensor and other parts.

 

The basic settings of the core gap position sensor include zero point (ZERO) and range (SPAN). Zero point (ZERO) refers to the sensor voltage value when the wall thickness hydraulic cylinder is at the starting position of the stroke. Range (SPAN) usually refers to the sensor voltage value when the wall thickness hydraulic cylinder is at the end of the stroke.


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The basic setting of the core gap position sensor is very important for the normal operation of the wall thickness control system. It is the basic data of the wall thickness control system. It is necessary to appropriately lower the pressure of the oil source during the setting. During the setting process, it may be necessary to repeatedly calibrate the sensor, the position correspondence between the cylinder piston and the die gap ensures accurate correspondence and prevents damage to mechanical or electrical parts due to accidental failures. Generally speaking, when the piston of the hydraulic cylinder is at the zero point, the die gap cannot be zero, and a certain safety gap must be ensured. At the same time, the sensor detection rod keeps a certain distance from the stroke end point, so as to ensure that the entire system is in a safe state. If the die is completely sealed (the gap is zero), the accidental failure of electrical parts may cause serious damage to mechanical parts such as the die, extruder screw and barrel, and gear box. The die gap at ZERO can be adjusted by manual wall thickness adjustment mechanism to achieve the required gap for production.


After the basic setting of the core gap position sensor is completed, generally speaking, there is no need to reset it when changing the die, unless the reference plane for sensor detection and installation changes. After this setting, the basic setting of the wall thickness controller of the continuous hollow molding machine has ended. Adjust the pressure of the servo hydraulic oil source to the normal working pressure, and the wall thickness control system can enter the working state.