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

由于一次性餐具設備的注入缸對模腔內的熔料實行保壓并補塑，因此只要少量油液，所以泵1卸載，泵2單獨供油，多余的油液經溢流閥4回油箱，保壓壓力由遠程調壓閥19調節。

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:

注入是指注入螺桿以一定的壓力和速度將料筒前端的熔料經噴嘴注入模腔，分慢速注入和速度注入兩種。

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通電)。泵2的壓力油經電液換向閥15左位和單向節流閥14進入注入缸右腔，左腔油液經電液換向閥11中位回油箱，注入缸活塞帶動注入螺桿慢速注入，注入速度由單向節流閥14調節，遠程調壓閥20起定壓作用。

(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通電)。泵1和泵2的壓力油經電液換向閥11右位進入注入缸右腔，左腔油液經換向閥11回油箱。由于一次性餐具設備中的兩個泵同時供油，且不經過單向節流閥14，因此注入速度加快了，此時，遠程調壓閥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、預塑(1Y、2Y、5Y1、7Y0通電)：

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

保壓完畢(時間控制)，從料斗加人的熔料隨著螺桿的轉動被帶料筒前端，進行加熱塑化，并建立一定壓力。當螺桿頭部熔料壓力到達能克服注入缸活塞退回的阻力時，螺桿開始后退。后退到預定位置，即螺桿頭部熔料達到所需注入量時，螺桿停止轉動和后退，準備下一次注入。與此同時，在模腔內的制品冷卻成形。

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.

一次性餐具設備中的螺桿轉動由預塑液壓馬達通過齒輪機構驅動。泵1和泵2的壓力油經電液換向閥15右位、旁通型調速閥13和單向閥12進入馬達，馬達的轉速由旁通型調速閥13控制，溢流閥4為閥。當螺桿頭部熔料壓力迫使注入缸后退時，注入缸右腔油液經單向節流閥14、電液換向閥15右位和背壓閥16回油箱，其背壓壓力由閥16控制。同時，注入缸左腔產生局部真空，油箱中的油液在氣壓作用下經網11中位進入其內。

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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