Injection molding machine is a kind of large-scale equipment of compact instrument. Displacement control is an important part of the whole equipment. It not only directly affects the quality of plastic products, but also relates to the quality of products and the efficiency of production.

During operation, it is used to control the displacement of the pellet screw to control the amount of molten material to ensure the accuracy of injection molding. Precise control of the locking mold is also a necessary condition for precision injection molding. If the position is not accurate enough, incomplete molding may occur and cannot be completed. Injection molding. In addition,   also need to strictly control the speed of injection molding to meet different density distribution problems. Therefore, effective control of injection position and molding speed is very important for precision injection molding.

In this development cycle system project, the different positions of mold clamping, injection table movement, injection molding and ejection of products need to be precisely managed and controlled. In the past applications, the potentiometer ruler has been widely used in injection molding machinery, but its accuracy, reliability, stroke and life are far lower than that of the magnetostrictive displacement sensor, because it is a contact type and is used repeatedly for a long time. Carbon brushes will inevitably wear out, causing them to fail.

Therefore, in this type of industry, the control system is technically indispensable for non-contact, durable and durable displacement sensors that can be connected to the field bus. The inductive linear displacement sensor is a displacement sensor developed from the summary of avoiding harm and benefiting from previous types of sensors. It has the characteristics of anti-magnetic field interference, anti-vibration, compact appearance, and good feedback effect on injection molding machines.

Since the signal acquisition and processing design is divided into two circuit boards, the flexibility of the sensor output type is greatly improved, and the output type of the sensor can be changed by changing different signal processing circuit boards, which reduces the product cost.

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