How does the servo gob feeder achieve precise metering and stable delivery of liquid raw materials through a high-precision servo control system?
Publish Time: 2025-08-25
In modern automated production, accurate metering and stable delivery of liquid raw materials have a crucial impact on product quality and production efficiency. This is particularly true in fields such as electronic assembly, medical devices, precision gluing, and food filling, where even slight discharge errors can lead to product defects or waste of resources. The servo gob feeder was designed to address this challenge. By integrating a high-precision servo control system, it achieves precise control of the entire liquid material process, from metering to delivery, making it an indispensable core component in high-end automated production lines.
The core of the servo gob feeder lies in its servo drive technology. Unlike traditional pneumatic or stepper motor drives, the servo system features closed-loop feedback control, enabling real-time monitoring of the motor's position, speed, and torque, and dynamically adjusting according to set parameters. During the feeding process, the servo motor drives a piston or screw through a precision lead screw or gear mechanism to achieve linear motion within the barrel, thereby evenly extruding the liquid material from the nozzle. Because the servo motor's rotational angle and speed control precision reaches micro-arc levels, combined with a high-resolution encoder, the piston's stroke and speed are highly controllable, ensuring highly consistent volume for each dispensing, with repeatability of ±1% or higher.
During the metering process, the servo control system precisely controls the piston's advance distance based on preset stroke parameters, thereby determining the volume of each single dispensing. Users can set a specific drop volume (e.g., microliters or milliliters) in the human-machine interface based on material viscosity, density, and process requirements, and the system automatically converts it into motor motion parameters. For complex processes requiring multi-stage dispensing, the device can store multiple programs, enabling automatic switching between different positions and dosages without manual intervention. Furthermore, the servo system supports stepless speed regulation, enabling a slow start at the start of dispensing to avoid splashing caused by pressure shock; a constant advance speed during the stabilization phase to ensure smooth flow; and a precise retraction at the end of the dispensing phase to prevent stringing or dripping.
To accommodate the rheological characteristics of varying materials, servo gob feeders are typically equipped with pressure sensors and adaptive control algorithms. The system monitors pressure changes within the pipeline in real time. When material viscosity fluctuations or temperature changes cause changes in flow resistance, the servo motor automatically adjusts its output torque to maintain constant propulsion force, thereby ensuring stable discharge. For high-viscosity materials, the system can also be configured with a "hold pressure" function to briefly maintain pressure after discharge, ensuring that the last drop is completely released from the nozzle and enhancing process integrity.
The servo system's responsiveness and dynamic performance are crucial during the conveying process. Traditional pneumatic systems suffer from response delays, pressure fluctuations, and high compressed air energy consumption. Servo drives, on the other hand, offer virtually zero-delay startup, reaching the set speed in milliseconds and rapidly stopping or reversing motion when needed. This rapid response is particularly useful for high-speed dispensing or continuous jetting, ensuring that no workstation is missed during high-speed production.
In addition, servo gob feeders often incorporate anti-drip and back-sucking features. At the end of discharge, the control system instructs the motor to slightly reverse, generating a brief negative pressure that draws back any remaining material from the nozzle, completely eliminating drooping after shutdown. The servo system precisely controls the re-suction stroke and speed to prevent excessive re-suction, which could lead to air bubbles being drawn in or poor discharge during the next step.
The device also supports digital communication with a host computer (such as a PLC or robot controller) for remote monitoring, parameter adjustment, and status feedback. Operators can view real-time operating data, set alarm thresholds, and perform fault diagnosis via the industrial bus, enhancing the intelligence and maintainability of the production line.
In summary, the servo gob feeder, with its high-precision servo control system, elevates the metering and delivery of liquid raw materials to micron-level accuracy. It not only achieves precise control of dosage and stable and consistent discharge, but also boasts excellent adaptability, programmability, and intelligent integration capabilities, providing solid technical support for the modern manufacturing industry's development towards high precision, high efficiency, and high reliability.
