The automatic pipette stretching machine has become an important representative equipment for automation upgrade in the field of experimental consumables manufacturing. The pipette is mainly made of polystyrene (PS) or polypropylene (PP). The initial embryo tube is obtained by injection molding, and then a conical tip is formed by heating and stretching to ensure the accuracy of liquid suction and the smoothness of liquid separation. The stretching process requires precise control of process parameters such as heating temperature, stretching speed, traction angle and cooling method, otherwise it is very easy to cause defects such as breakage, eccentricity, bubbles, and rough inner wall of the product.

　　1. Equipment composition and working principle of the automatic pipette stretching machine

　　The automatic pipette stretching machine is an intelligent equipment that integrates automatic feeding, heating control, synchronous stretching, cooling molding and automatic material collection. Its core structure includes:

　　Automatic feeding system: The directional arrangement and automatic feeding of the embryo tube are realized through a vibration plate or a manipulator, which is suitable for a variety of tube diameter specifications.

　　Heating system: An infrared heater or a hot air circulation device is used to accurately control the temperature of the heating zone to ensure uniform heating of the embryo tube.

　　Stretching system: equipped with a servo-driven clamping mechanism, the tube body is stretched synchronously through a preset program to ensure uniform taper and consistent size.

　　Cooling and shaping module: Directional cooling is performed immediately after stretching to fix the shape and prevent shrinkage or deformation.

　　Automatic material collection system: The finished product automatically falls into the material collection tray or transfer mechanism, which can be connected with subsequent testing, printing, and packaging equipment to achieve full line automation.

　　Intelligent control platform: PLC control system is adopted, with a touch screen interface, supporting parameter adjustment, program storage, fault alarm and data recording.

　　II. Technical advantages and performance highlights

　　High-precision dimensional control: The control accuracy of stretching length, angle and outer diameter of the tube mouth can reach ±0.05mm to ensure the consistency of finished product size.

　　High-efficiency production capacity: A single machine can complete the stretching operation of dozens to hundreds of pipettes per minute, greatly improving production capacity.

　　Strong stability and high yield rate: Advanced tension control and heating temperature control technology ensure high stability and high yield rate during continuous operation.

　　Strong compatibility: The device supports fast switching of various types of pipettes (such as 1mL, 5mL, 10mL, 25mL, etc.) to meet the needs of different specifications.

　　Save labor and energy consumption: Automation replaces traditional manual operations to reduce labor costs, and effectively saves energy and reduces consumption through intelligent power management systems.

　　Strong scalability: It can be integrated with automatic screen printing machines, packaging machines, and quality inspection equipment to build a complete line solution for intelligent manufacturing of pipettes.

　　The automatic pipette stretching machine is not only a technological upgrade product of experimental consumables manufacturing equipment, but also an important driving force for promoting the high-quality and intelligent development of the biomedical consumables industry. It provides manufacturing companies with more efficient, more accurate, and more reliable production solutions, and also provides laboratories and medical end users with basic consumables with better quality and more stable performance.