Injection molding machine referred to as an injection molding machine. The working principle is to use the thermoplastic of the plastic, heat the material to the cylinder, so that the material is melted, then at a high speed, high pressure to quickly flow into the mold cavity, after a period of time, cool, and curing the fixed shape, The mold opens the mold under the action of the composite system, and the stereotyped article is taken out from the mold by top out of the device. The top needle formation is a loop process, the first included: quantitative feeding - melt plasticization - lock mode - front shift - pressure injection molding - Removal cooling - Top Needle Back - Opening - Out of Products, take out After the plastic parts, close the mold and perform the next cycle. Since the signal acquisition and disposal of two boards are selected, the flexibility of the injection molding machine is greatly improved. In this circulating engineering, several stations of locking mode, top needle move, injection molding and topped products are needed to be accurately controlled. Total injection molding and latching mutual control play an important role in the performance and product accuracy of an injection molding machine. Injection molding machine lock mode, injection table movement, injection molding, and top-out article position control precision is controlled by the displacement sensor, injecting the molten plastic into the mold cavity by the screw, relying on the screw drive control injection molding and melt. Locking mode, injection table movement, top-out products are controlled by hydraulic control, controlled by pressure and speed, and the position is set by the injection molding machine. Although all injection molding machines are only a small part of the injection molding machine, it is crucial to control the implantation mold, injection molding station, and topped products. With the new product of the injection molding machine, the new product is emerging or widely used in the injection molding machine, the improvement of the precision of the injection molding machine has a good space, which will have important significance for improving the quality of plastic parts, and cost production costs.