Automatic dispensing machine needle selection guide

In automated production, the selection of automatic dispensing machine needles is crucial, which directly affects the dispensing effect and production efficiency. Shenzhen Xiaomao Automation Technology Co., Ltd., with its years of technical accumulation, provides you with the following detailed guide to help you easily deal with the needle selection problem.

Basic specifications and applicable scenarios of automatic dispensing machine needles
Automatic dispensing machine needles are distinguished by color codes, from Olive 14 (large) to Yellow 32 (small), forming a complete specification chain to meet different precision requirements. Stainless steel needles are widely used due to their high precision and durability. Under special working conditions, such as dispensing of special-shaped cavities, angled needles can be selected, such as spiral plastic seat needles, which can achieve ±45° angle adjustment to ensure the flexibility of dispensing.

The influence of glue properties on needle selection

1. Glue viscosity: For high-viscosity glues, such as epoxy resin AB glue, large-caliber needles, such as TT oblique needles, should be selected to avoid blockage and ensure smooth flow of glue. For low-viscosity glues, such as some glues used for electronic packaging, small-caliber needles can be selected to achieve more precise dispensing control.
2. Thixotropy of glue: For thixotropic fluids, it is recommended to configure a dynamic mixing screw valve to ensure the uniformity of the glue in the needle and avoid uneven dispensing.
3. Special glues: For example, UV glue needs to be equipped with a light-shielding needle to prevent the glue from solidifying during transportation; anaerobic glue needs to be equipped with a special syringe to ensure the stability of the glue and the dispensing effect.

Product precision requirements and needle selection
The precision requirements of the product directly affect the selection of the needle. For high-precision products, such as precision electronic chips, small-caliber, high-precision needles are required to achieve precise dispensing in tiny areas. For products with relatively low precision requirements, such as the joints of large furniture, larger-caliber needles can be selected to increase production speed.

Impacts and solutions of inappropriate needle size
1. Too large needles: excessive glue outflow, resulting in glue waste, and may affect the appearance and performance of the product. Solutions include replacing the needle with a smaller caliber and adjusting the dispensing machine parameters, such as dispensing time and pressure.
2. The needle is too small: it will cause the glue to flow out slowly and the flow rate is small, which will reduce production efficiency and may cause uneven dispensing due to insufficient glue supply. Solutions include replacing the needle with a larger caliber and appropriately increasing the pressure of the dispensing machine.

Steps and precautions for replacing the needle
1. Stop and power off: Before replacing the needle, make sure that the dispensing machine is in a stopped state and disconnect the power supply to avoid accidents.
2. Install a new needle: After selecting a suitable needle, install it according to the operating procedures to ensure that the needle and the dispensing valve are tightly connected and well sealed.
3. Debugging and testing: After installation, conduct a small batch trial production, observe the dispensing effect, and check whether the flow rate, uniformity and dispensing position of the glue meet the requirements. If necessary, fine-tune the parameters of the dispensing machine.

Shenzhen Xiaomao Automation Technology Co., Ltd. provides a full range of needles and technical support. Our technical team has extensive industry experience and can provide customers with professional needle selection suggestions and technical support. Choosing the right needle will make your production more efficient and more accurate!