Working principle of fruit and vegetable weight sorting scale
Fruit and vegetable weight sorting scale is an automated equipment that integrates conveying, weighing, and sorting. Its core goal is to quickly and accurately classify fruits and vegetables into different categories according to a predetermined weight range.
The workflow can be decomposed into the following core steps:
1. Loading and arrangement
Purpose: To transport individual fruits and vegetables that are haphazardly stacked in an orderly and single row manner to the weighing area.
Implementation method: Usually achieved through vibrating feeders or belt conveyors. The vibrating feeder uses micro amplitude vibration to move fruits and vegetables forward and naturally disperse, forming a single layer; Subsequent arrangement devices (such as single row belts or rollers) will organize them into evenly spaced single rows, ensuring that only one fruit or vegetable enters the weighing station at a time.
2. Dynamic weighing
Objective: To quickly and accurately measure the weight of fruits and vegetables during their movement.
core components
Weighing sensor: This is the "heart" of the device, usually using high-precision strain gauge sensors. When fruits and vegetables pass through the weighing area (an independent, very short weighing belt or scale pan), their weight will cause the strain gauges inside the sensor to deform, resulting in an electrical signal proportional to the weight.
Speed sensor: simultaneously detects the speed of the conveyor belt.
Technical difficulties and solutions: Due to the movement of objects, various interferences (such as vibration and impact) may occur. Advanced sorting scales use digital signal processing technology to accurately extract stable weight signals from noisy signals through high-speed sampling and algorithmic filtering, and calculate the true weight in a very short time (millisecond level).
3. Data processing and judgment
Purpose: To compare the measured weight with the preset weight grade and issue sorting instructions.
Implementation method: The industrial computer or PLC controller receives signals from the weighing sensor, compares them with the weight range pre-set by the operator (e.g. 100-120g is Class A, 120-140g is Class B, etc.), and instantly determines which grade the fruit or vegetable belongs to.
4. Sorting execution
Purpose: According to the instructions of the controller, push or import fruits and vegetables into the corresponding collection area.
Common executing agencies:
Push rod type: the most commonly used. When the fruits and vegetables reach their corresponding level of feeding port, a pneumatic or electric push rod quickly moves to push them into the collection box or conveyor belt below.
Paddle type/swing arm type: suitable for fragile fruits and vegetables (such as strawberries and tomatoes), use a soft paddle to gently move them to the corresponding channel.
Barrier type: A reversible barrier is installed at the sorting channel to guide fruits and vegetables into different areas by changing the direction of the barrier.
Belt horizontal movement: The entire weighing belt can move horizontally to directly transport fruits and vegetables to the corresponding outlet.
5. Human computer interaction and data statistics
Purpose: To facilitate operation and monitoring.
Implementation method: Through the touch screen human-machine interface, operators can easily set weight levels, calibrate scales, and view production data (such as total output, quantity per level, average weight, efficiency, etc.), which are crucial for production management and cost accounting.