1、 Voltage maintaining (2Y, 5y1, 7y1, 9y0 are energized)

由于一次性餐具设备的注入缸对模腔内的熔料实行保压并补塑，因此只要少量油液，所以泵1卸载，泵2单独供油，多余的油液经溢流阀4回油箱，保压压力由远程调压阀19调节。

As the injection cylinder of disposable tableware equipment maintains pressure and replenishes the molten material in the mold cavity, only a small amount of oil is needed. Therefore, pump 1 is unloaded and pump 2 is supplied with oil separately. The surplus oil is returned to the oil tank through overflow valve 4, and the pressure maintaining pressure is regulated by remote pressure regulating valve 19.

二、注入：

2、 Injection:

注入是指注入螺杆以一定的压力和速度将料筒前端的熔料经喷嘴注入模腔，分慢速注入和速度注入两种。

Injection refers to that the injection screw injects the molten material at the front end of the barrel into the mold cavity through the nozzle at a certain pressure and speed, which can be divided into slow injection and speed injection.

(1)慢速注入(2Y、5Y1、7Y1、8Y通电)。泵2的压力油经电液换向阀15左位和单向节流阀14进入注入缸右腔，左腔油液经电液换向阀11中位回油箱，注入缸活塞带动注入螺杆慢速注入，注入速度由单向节流阀14调节，远程调压阀20起定压作用。

(1) Slow injection (2Y, 5y1, 7y1, 8y power on). The pressure oil of pump 2 enters the right cavity of injection cylinder through the left position of Electro-hydraulic Directional Valve 15 and one-way throttle valve 14. The oil in left chamber returns to the oil tank through the middle position of electro-hydraulic directional valve 11. The piston of injection cylinder drives the injection screw to inject slowly. The injection speed is regulated by one-way throttle valve 14, and the remote pressure regulating valve 20 is used for constant pressure.

(2)速度注入(1Y、2Y、5Y1、6Y0、7Y1、8Y通电)。泵1和泵2的压力油经电液换向阀11右位进入注入缸右腔，左腔油液经换向阀11回油箱。由于一次性餐具设备中的两个泵同时供油，且不经过单向节流阀14，因此注入速度加快了，此时，远程调压阀20起作用。

(2) Velocity injection (1y, 2Y, 5y1, 6y0, 7y1, 8y are powered on). The pressure oil of pump 1 and pump 2 enters the right cavity of injection cylinder through the right position of electro-hydraulic directional valve 11, and the oil in left chamber returns to the oil tank through directional valve 11. Since the two pumps in the disposable tableware equipment supply oil at the same time and do not pass through the one-way throttle valve 14, the injection speed is accelerated. At this time, the remote pressure regulating valve 20 plays a safety role.

三、预塑(1Y、2Y、5Y1、7Y0通电)：

3、 Prepreg (1y, 2Y, 5y1, 7y0 electrified)

保压完毕(时间控制)，从料斗加人的熔料随着螺杆的转动被带料筒前端，进行加热塑化，并建立一定压力。当螺杆头部熔料压力到达能克服注入缸活塞退回的阻力时，螺杆开始后退。后退到预定位置，即螺杆头部熔料达到所需注入量时，螺杆停止转动和后退，准备下一次注入。与此同时，在模腔内的制品冷却成形。

After the pressure maintaining (time control), the molten material added from the hopper is brought to the front end of the barrel with the rotation of the screw, which is heated and plasticized, and a certain pressure is established. When the melt pressure at the screw head can overcome the resistance of piston returning, the screw begins to retreat. When the molten material at the screw head reaches the required injection amount, the screw stops rotating and retreats to prepare for the next injection. At the same time, the product in the die cavity is cooled to form.

一次性餐具设备中的螺杆转动由预塑液压马达通过齿轮机构驱动。泵1和泵2的压力油经电液换向阀15右位、旁通型调速阀13和单向阀12进入马达，马达的转速由旁通型调速阀13控制，溢流阀4为阀。当螺杆头部熔料压力迫使注入缸后退时，注入缸右腔油液经单向节流阀14、电液换向阀15右位和背压阀16回油箱，其背压压力由阀16控制。同时，注入缸左腔产生局部真空，油箱中的油液在气压作用下经网11中位进入其内。

The screw rotation in disposable tableware equipment is driven by the pre molding hydraulic motor through the gear mechanism. The pressure oil of pump 1 and pump 2 enters the motor through the right position of Electro-hydraulic Directional Valve 15, bypass speed regulating valve 13 and check valve 12. The speed of motor is controlled by bypass speed regulating valve 13, and relief valve 4 is safety valve. When the melt pressure at the screw head forces the injection cylinder to retreat, the oil in the right cavity of the injection cylinder returns to the oil tank through one-way throttle valve 14, right position of Electro-hydraulic Directional Valve 15 and back pressure valve 16, and the back pressure pressure pressure is controlled by valve 16. At the same time, local vacuum is generated in the left cavity of the injection cylinder, and the oil in the oil tank enters into it through the middle position of net 11 under the action of air pressure.

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