Industrial Fruit Grading Machine: Size, Weight, and Optical Classification
Designed for fruit wholesalers, packhouses, distributors, processors, and growers, this industrial system classifies fresh fruit into uniform commercial grades prior to packaging and distribution. By replacing manual sorting with automated mechanical and electronic classification, the system ensures consistent commercial grading, maximizes processing throughput, and significantly reduces labor dependencies while minimizing post-harvest fruit loss.
Suitable Products: Apples, oranges, lemons, pears, peaches, plums, mangoes, pomegranates, passion fruit, tomatoes, and potatoes (subject to fruit size, shape, firmness, and machine configuration).
Core Grading Methods
1. Size Grading (Roller-Type)
Function: Separates fruit by diameter or physical dimension using precision roller gaps.
Operation: As fruit moves along the grading bed, smaller fruit drops through earlier sections, while larger fruit continues to subsequent outlets.
Standard Categories: Small, Medium, Large, Extra Large, or custom millimeter intervals (e.g., 50-55 mm, 55-60 mm, 60-65 mm, 65-70 mm).
2. Weight Grading
Function: Classifies individual fruit by precise weight using high-sensitivity electronic weighing cells.
Operation: Fruit passes over weighing positions where the control system compares actual weight against preset grading ranges, routing each piece to its designated outlet.
Accuracy: Industrial systems achieve an operating accuracy of approximately +/-2 g under stable conditions. (Actual performance depends on fruit characteristics, line speed, and factory calibration).
3. Optical Grading
Function: Integrates industrial cameras and high-speed image-processing modules for advanced quality sorting.
Evaluation Metrics: Surface defects, color uniformity, shape anomalies, and external blemishes.
Technology: Utilizes multi-spectrum RGB, NIR (Near-Infrared), and UV imaging combinations to detect internal/external flaws and meet high-end retail and international export market standards.
Key Engineering Features
Adjustable Grade Outlets: Configurable from 3 to 10+ outlets depending on your sorting criteria and factory space constraints.
Variable Speed Control: Inverter-driven conveyors allow operators to match line speed with fruit ripeness and throughput requirements.
Low-Damage Transfer: Engineered with controlled feeding drops, cushioned contact surfaces, and smooth transition rollers to minimize bruising and protect fruit quality.
Modular Integration: Designed to operate as a standalone unit or integrate seamlessly into continuous washing, drying, waxing, and packing lines.
Industrial Control System: Centralized PLC touch-screen control panel manages conveyor speed, sorting parameters, real-time output data, and system diagnostics.
Technical Specifications
|
Parameter |
Specification |
|
Machine Type |
Industrial Fruit Grading Machine |
|
Grading Method |
Size / Weight / Optical / Customized Combination |
|
Applicable Fruit |
Apples, Oranges, Mangoes, etc. (Customized per sample) |
|
Capacity |
3-10 t/h (Configurable to requirements) |
|
Number of Grades |
3-10+ Outlets |
|
Weight Range |
Custom configured based on fruit variety |
|
Size Range |
Custom configured based on fruit variety |
|
Grading Accuracy |
+/-2 g (Weight) / +/-1 mm (Size) under test conditions |
|
Main Material |
304 Stainless Steel (Product-Contact Areas) / Carbon Steel Frame |
|
Conveyor Material |
Food-Grade Polyurethane / Special Rubber |
|
Motor Power |
Customized based on line length (4-11 kW) |
|
Voltage / Frequency |
380V / 220V, 50/60 Hz (Customized for local standards) |
|
Control System |
PLC with Color Touchscreen Interface |
|
Installation Support |
On-site engineering guidance / Remote technical support |
Complete Processing Line Integration
The grading machine interfaces smoothly with upstream and downstream equipment to form a continuous, high-efficiency packing line:
Fruit Receiving -> Washing -> Drying -> Inspection -> Grading -> Sorting -> Packing -> Storage
Quality Control & Factory Testing
Every machine undergoes strict multi-stage inspection before export to guarantee reliable on-site performance:
Dimensional and material verification of all mechanical parts.
Frame alignment, conveyor tension, and safety guard placement verification.
Verification of PLC logic, sensor response, motor loads, and emergency stop mechanisms.
Mechanical run test under simulated load to confirm smooth operation and stable sorting output.
Required Information for Quotation
To help our engineering team configure the optimal machine for your facility, please provide the following details when submitting an inquiry:
Fruit Type: (E.g., Apples, Oranges, Mangos)
Fruit Size / Weight: Minimum, average, and maximum dimensions or weight.
Required Capacity: Target output in kg/h or t/h.
Grading Criteria: Size (mm), weight (g), or optical defect sorting priorities.
Number of Grades: Desired number of commercial size/weight categories.
Factory Layout Constraints: Available floor space and integration requirements with existing equipment.
Frequently Asked Questions
Q: What fruits can the Fruit Grading Machine process?
A: The machine can be configured for suitable fruits such as apples, oranges, lemons, pears, peaches, plums, mangoes, pomegranates, and passion fruit. Exact configurations are tailored and validated based on customer fruit samples and physical specifications.
Q: Does the machine grade fruit by size or weight?
A: Both options are available depending on your selection. Roller-type systems classify fruit by physical size, while electronic grading systems classify individual fruit according to precise weight. Optical systems can additionally evaluate characteristics such as color, shape, and external surface defects.
Q: How accurate is the grading machine?
A: Accuracy depends on the chosen grading technology, fruit characteristics, operating speed, calibration, and required grading range. For example, our standard weight-grading systems achieve an operating accuracy of +/-2 g under specified stable test conditions.
Q: How many grades can the machine produce?
A: The number of grades depends on the machine model and outlet configuration. Standard commercial systems are available with multiple sorting outlets, while fully customized systems can be engineered to meet specific target market requirements.
Q: Can the grading size be adjusted?
A: Yes. Size-grading sections can be easily adjusted or configured according to the required fruit diameter ranges to adapt to seasonal variations or different crop harvests.
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