Weight Grading Machines & Multi-Level Sorters
A weight grading machine weighs each product in motion and routes it to one of multiple outlets by weight class, turning a mixed stream into uniform grades. MIQI builds four multi-level sorters. The swing-arm MQ-CW5012L2-C6 and MQ-CW4523L2-C6 cover 1-2000 g at ±0.3-2 g with 1 to 20 sorting outlets and belt speeds to 90 m/min, using air-blast, push-rod, toggle, flap, or turntable diverts as the product demands. The disc-type MQ-CW750TC6 carries small items in individual 145 × 70 mm trays through 6 to 20 grade outlets, suited to sticky or delicate pieces in the 1-200 g band. The dual-channel MQ-CW412L2S-C4 runs two parallel lanes of 4-8 grades each for crayfish and similar small aquatic products, doing the work of two grading lines in one frame. All models store 100 recipes, export data by USB, and are built in 304 stainless steel for washdown food environments.
A weight sorter, or weight grading machine, is a conveyor weighing system that classifies products into multiple weight bands and physically diverts each item to the outlet assigned to its band. Where a checkweigher makes a pass/fail decision, a weight sorter makes an N-way decision, commonly 4 to 20 grades, so that every piece ends up in a batch of uniform weight. Weight sorters are the standard tool for grading seafood, poultry portions, produce, and hardware into sellable size classes.
Multi-Grade Weight Sorter Models
Swing-Arm Weight Sorting Machine
- Weighing range: 1-2000g
- Weighing accuracy: ±0.3-2g
Dual-Layer Seafood Weighing and Sorting Machine
- Weighing range: 1-2000g
- Weighing accuracy: ±0.3-2g
Rotary Disc Weight Sorting Machine
- Weighing range: 1-200g
- Weighing accuracy: ±0.3-2g
Dual-Channel Crayfish Weight Sorter
- Weighing range: 1-200g
- Weighing accuracy: ±0.3-2g
Weight Grading Machine Comparison
| Model | Weighing Range | Accuracy | Max Speed | Grade Outlets |
|---|---|---|---|---|
| MQ-CW5012L2-C6 | 1-2000 g | ±0.3-2 g | 90 m/min belt | 1-20 optional |
| MQ-CW4523L2-C6 | 1-2000 g | ±0.3-2 g | 90 m/min belt | 1-20 optional |
| MQ-CW750TC6 | 1-200 g | ±0.3-2 g | Tray line 1-300 m/min | 6-20 optional, tip-tray discharge |
| MQ-CW412L2S-C4 | 1-200 g | ±0.3-2 g | 90 m/min belt | 4-8 grades × 2 channels |
Weight Grading Machines & Multi-Level Sorters: Working Principle
Weight Sorter Price & Quote Factors
Weight grading machine price depends mainly on weight range, real dynamic accuracy, product handling, outlet count, divert mechanism, hygiene construction and production-data requirements. Each added grade also needs conveyor length, containers and downstream handling. MIQI therefore quotes from the actual grade boundaries, product distribution, throughput and cleaning method instead of publishing an unsupported universal market range.
Weight Grading Machine Selection Topics
Fish and Seafood Grading Machines
A fish grading machine or fish grading system sorts spaced pieces into programmed weight bands. Wet, irregular products require trials for belt grip, spacing, transfer and gentle discharge.
Poultry Grader and Poultry Grading System
A poultry weight sorter can route portions into multiple commercial grades. Specify the real piece range, grade boundaries, outlet count, cleaning method and required portions per minute.
Types of Weight Sorting Machines
MIQI documents swing-arm, disc and dual-channel multi-grade machines. Choose by product handling and outlets, not by maximum advertised conveyor speed alone.
Fish, Poultry and Food Weight Grading
Crayfish and small seafood
The dual-channel MQ-CW412L2S-C4 grades crayfish into 4-8 classes per lane at ±0.3-2 g, serving processing plants, buying stations, and live-seafood e-commerce.
Poultry and meat portions
Swing-arm sorters grade portions across 1-2000 g into up to 20 classes, feeding fixed-weight packing with uniform pieces.
Produce and aquatic products
Weight-based grading standardizes size classes for items where dimension sorting fails, with gentle flap and turntable diverts protecting soft product.
Hardware and molded parts
Small components are graded or verified by weight at up to 20 outlets, separating mixed or off-spec parts from production flow.
Confectionery and small packs
The disc-type MQ-CW750TC6 carries sticky or fragile pieces in individual trays, grading the 1-200 g band into 6-20 classes without product-on-product contact.
Related Weighing Equipment
Frequently Asked Questions
What is the difference between a weight sorter and a checkweigher?+
A weight sorter classifies products into multiple weight grades and diverts each piece to its grade outlet, while a checkweigher makes a binary accept/reject decision against one tolerance. Mechanically the two share a dynamic weighing platform; the difference is downstream, where a sorter carries 4 to 20 divert stations instead of a single reject. Choose a checkweigher when the question is whether this pack complies, and a weight sorter when the question is which batch this piece belongs in. MIQI builds both on common platforms, so accuracy specifications such as ±0.3-2 g over 1-2000 g carry across, and a grading line can add checkweigher-style pass/fail logic in any grade.
How many grade outlets does a grading project need?+
Match the outlet count to the number of commercial size classes you actually sell, plus one outlet for rejects or off-spec product. Crayfish typically trade in 4-8 size classes, which is why the MQ-CW412L2S-C4 is configured at 4-8 grades per channel; portion grading for fixed-weight packs commonly uses 6-12 classes; and complex yield-optimization schemes may justify up to the 20 outlets MIQI's swing-arm sorters support. More outlets always cost more length and money, so the practical method is to price each additional grade against the margin recovered by selling that class separately. MIQI configures outlet count 1-20 at order time, and recipes let one machine run different grade schemes per product.
How is fragile or sticky product graded without damage?+
The two protective options are gentle divert mechanisms and tray-based conveying. Swing-arm sorters can be fitted with flap or turntable diverts that lower product instead of striking it, which suits soft portions and coated items. Where products would stick to belts or shed coating, the disc-type MQ-CW750TC6 places each 1-200 g piece in its own 145 × 70 mm tray; the tray travels through weighing and simply tips at the assigned outlet, so the product is never pushed, blown, or slid. Tray grading also prevents piece-on-piece contact entirely. Product trials decide the choice: run the real product at rated speed and inspect for damage before fixing the divert specification.
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