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　　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.

　　所以每更換一半的膠管必須是空接頭，關(guān)于膠的固化，一般廠(chǎng)家都給出了一個(gè)溫度曲線(xiàn)。在實(shí)踐中應盡量選擇溫度高的固化，使固化后的膠水達到強度要求。

　　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.

　　膠液的粘度直接影響著(zhù)膠液的質(zhì)量。粘度較大時(shí)，則膠點(diǎn)會(huì )變小，甚出現拉絲現象;粘度小，膠點(diǎn)會(huì )變大，然后可能會(huì )滲透到焊盤(pán)上。在上膠過(guò)程中，應根據膠水的粘度不同，選擇合理的背壓和上膠速度。

　　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.

　　除去膠水對外界環(huán)境的影響，關(guān)于點(diǎn)膠機本身，一般企業(yè)使用的點(diǎn)膠機是使用螺桿泵供應點(diǎn)膠針。

　　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，需求采用恒壓螺桿泵保證供膠，如果壓力過(guò)大，容易造成膠水溢出，膠量過(guò)多;壓力過(guò)小會(huì )出現點(diǎn)膠間歇、漏膠的現象，進(jìn)而造成缺點(diǎn)。

　　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.

　　所以應根據膠水的不同質(zhì)量，點(diǎn)膠機工作環(huán)境的溫度來(lái)選擇壓力。較高的環(huán)境溫度會(huì )使膠水的粘度變小，流動(dòng)性更好，這時(shí)需要降低背壓以保證膠水的供應，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.

　　在實(shí)踐中，我們認為針的內徑應該是點(diǎn)膠點(diǎn)直徑的1/2，這是更理想的點(diǎn)膠方式。因此，在點(diǎn)膠過(guò)程中，應根據PCB上焊盤(pán)的大小選擇點(diǎn)膠針，以保證點(diǎn)膠點(diǎn)的質(zhì)量，提高生產(chǎn)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.

　　不同的點(diǎn)膠機選用不同的針，有些針有一定程度的停止。校正針與印刷電路板之間的距離，即， z軸高度校準，應該在每一個(gè)操作的開(kāi)始，這往往是簡(jiǎn)單地忽略。

　　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.

　　根據操作經(jīng)驗，焊點(diǎn)的直徑應該是焊盤(pán)距離的一半，貼片后的接點(diǎn)直徑應該是接點(diǎn)直徑的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.

　　這確保了有足夠的膠水來(lái)粘合元素，并防止太多的膠水浸透墊。由螺桿泵的旋轉時(shí)間多少來(lái)確定實(shí)踐的長(cháng)度，應根據室溫、膠的粘度來(lái)選擇泵的旋轉時(shí)間。

　　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.