Loss-in-Weight Screw Feeder

I. Product Overview

Category: Industrial Automated Dosing and Feeding Systems / Powder Quantitative Feeder.
Applications: Widely used in industries requiring high-precision continuous or batch quantitative feeding, such as chemical, pharmaceutical, food, plastic compounding (e.g., masterbatch addition), and lithium battery materials. It is particularly suitable for fine powders or granular materials with poor flowability or those prone to bridging.
Core Function: Utilizing dynamic weighing technology, the system monitors the real-time weight loss rate of the hopper (loss-in-weight logic). The PLC system precisely controls the screw speed to achieve accurate, constant flow feeding.

High-Precision Dosing Control: Equipped with industrial-grade high-sensitivity load cells for real-time feedback on weight changes. Dosing accuracy can reach ±1% - 2%, ensuring strict consistency in mixture ratios.
304 Stainless Steel Construction: Parts in contact with materials are made of food/pharmaceutical grade S304 stainless steel. It is corrosion-resistant, easy to clean, and complies with international hygiene standards to prevent material contamination.
Active Agitation and Anti-Bridging Technology: Features an integrated internal agitation or anti-bridging mechanism to forcefully eliminate "bridging" or "rat-holing" phenomena within the hopper. This ensures smooth feeding even for sticky or ultra-fine powders.
Intelligent PLC Closed-Loop System: The system automatically adjusts the variable frequency motor speed based on the target feeding rate, requiring no manual intervention. It supports linkage with other equipment in the production line.
Modular Customization: The discharge outlet height and connection interface can be customized to match the height of your existing reactors, packaging machines, or mixers.

Material Loading: Add material into the 40L storage hopper.
Parameter Setting: Set the target feeding speed (e.g., kg/h) or single-batch dosing weight on the control panel or PLC touch screen.
Start Operation: Once the system starts, the PLC reads the initial weight from the sensors.
Loss-in-Weight Monitoring: As the screw rotates to feed, the weight in the hopper decreases. The PLC calculates the weight difference per unit of time.
Dynamic Adjustment: If the actual weight loss rate is lower than the set value, the PLC automatically increases the screw speed; otherwise, it decreases it to maintain a constant output.
Automatic Stop/Refill: Upon reaching the preset weight or triggering a low-level alarm, the system stops automatically or prompts for a refill.

Pain Point Marketing: For clients struggling with "inaccurate manual feeding" or "dust pollution," emphasize the machine's "automatic closed-loop control" and "fully enclosed structure."
Case Reference: During negotiations, refer to the 1000g test result shown in the video (actual measured 999g) to visually demonstrate its exceptional stability.

Q: Can this machine handle sticky powders?
- A: Yes. We have specifically designed an internal agitation mechanism that effectively prevents material bridging, ensuring sticky powders are fed under uniform force.
Q: Is the accuracy affected by environmental vibration?
- A: The machine base is equipped with vibration-damping supports, and the PLC algorithm includes digital filtering to minimize reading interference from industrial environmental vibrations.
Q: How is the after-sales support?
- A: We provide a one-year warranty on core components and offer remote video guidance for debugging.

Payment: 30% deposit; remaining balance to be paid after production and video inspection before shipment.
Logistics: Specialized line logistics delivery, wooden crate packaging.
After-sales: One-year full machine warranty with long-term support for wearing parts.

Payment: 30% T/T deposit, 70% balance before shipment.
Lead Time: 10-15 working days.
Packaging: Standard export-grade plywood case for maximum protection.
After-sales: 12-month warranty on key components; professional English technical support.