It is the equipment to control the spitting and spitting of the dispensing glue machine. Therefore, the use of the dispensing machine will inevitably affect the quality problem solving of the electric glue: the glue in the aspect of glue, the glue can not have bubbles, small bubbles will lead to a large number of pads without glue, empty phenomenon, which may lead to unqualified products.

　　所以每更换一半的胶管必须是空接头，关于胶的固化，一般厂家都给出了一个温度曲线。在实践中应尽量选择温度高的固化，使固化后的胶水达到强度要求。

　　Therefore, every half of the rubber tube to be replaced must be an empty joint. For the curing of rubber, the general manufacturer has given a temperature curve. In practice, high temperature curing should be selected as far as possible to make the cured glue meet the strength requirements.

　　胶液的粘度直接影响着胶液的质量。粘度较大时，则胶点会变小，甚出现拉丝现象;粘度小，胶点会变大，然后可能会渗透到焊盘上。在上胶过程中，应根据胶水的粘度不同，选择合理的背压和上胶速度。

　　The viscosity of glue directly affects the quality of glue. When the viscosity is large, the glue point will become smaller, or even wire drawing will occur; when the viscosity is small, the glue point will become larger, and then it may penetrate into the pad. In the process of gluing, the reasonable back pressure and gluing speed should be selected according to the viscosity of glue.

　　除去胶水对外界环境的影响，关于点胶机本身，一般企业使用的点胶机是使用螺杆泵供应点胶针。

　　To remove the impact of glue on the external environment, as for the dispensing machine itself, the general enterprise uses a screw pump to supply dispensing needles.

　　因此，需求采用恒压螺杆泵保证供胶，如果压力过大，容易造成胶水溢出，胶量过多;压力过小会出现点胶间歇、漏胶的现象，进而造成缺点。

　　Therefore, the constant pressure screw pump is required to ensure glue supply. If the pressure is too large, it is easy to cause glue overflow and excessive glue amount; if the pressure is too small, it will cause intermittent dispensing and glue leakage, which will cause defects.

　　所以应根据胶水的不同质量，点胶机工作环境的温度来选择压力。较高的环境温度会使胶水的粘度变小，流动性更好，这时需要降低背压以保证胶水的供应，反之亦然。

　　Therefore, the pressure should be selected according to the different quality of glue and the temperature of dispensing machine working environment. Higher ambient temperature will make the viscosity of glue smaller and the fluidity better. At this time, it is necessary to reduce the back pressure to ensure the supply of glue, and vice versa.

　　在实践中，我们认为针的内径应该是点胶点直径的1/2，这是更理想的点胶方式。因此，在点胶过程中，应根据PCB上焊盘的大小选择点胶针，以保证点胶点的质量，提高生产功率。

　　In practice, we think that the inner diameter of the needle should be 1 / 2 of the diameter of the dispensing point, which is the most ideal way of dispensing. Therefore, in the dispensing process, the dispensing needle should be selected according to the size of the pad on the PCB to ensure the quality of the dispensing point and improve the production power.

　　不同的点胶机选用不同的针，有些针有一定程度的停止。校正针与印刷电路板之间的距离，即， z轴高度校准，应该在每一个操作的开始，这往往是简单地忽略。

　　Different dispensing machines choose different needles, some of which stop to a certain extent. The distance between the calibration pin and the PCB, i.e. z-axis height calibration, should be at the beginning of each operation, which is often simply ignored.

　　根据操作经验，焊点的直径应该是焊盘距离的一半，贴片后的接点直径应该是接点直径的1.5倍。

　　According to the operation experience, the diameter of the welding spot should be half of the distance between the pads, and the diameter of the contact after mounting should be 1.5 times of the diameter of the contact.

　　这确保了有足够的胶水来粘合元素，并防止太多的胶水浸透垫。由螺杆泵的旋转时间多少来确定实践的长度，应根据室温、胶的粘度来选择泵的旋转时间。

　　This ensures that there is enough glue to bond the elements and prevents too much glue from soaking the pad. The practical length is determined by the rotation time of the screw pump. The rotation time of the pump should be selected according to the room temperature and the viscosity of the glue.