Weight Drop Scale, Weight Checking Scale, Conveyor Check Weigher/Weight Sorter, Check Weight Machine

High accuracy weight drop scale 
Feature
 
Continuous batching material for cement, coal powder, all kinds of powder, bulk material and various kinds of granular powder materials, including the small flow batching, it’s also available for liquid continuous batching.
 
Application industry / Technical feature
Continuous batching for stabilized soil and concrete of the cement concrete mixing station
Dinas and sands random batching by forklift
Quantitative feeding control of sintering
Quantitative feeding control of coal powder
All kinds of liquid batching
Suitable for all kinds of material batching control of weight drop
 
 
Accuracy: System weighing, accuracy control less than0.5%
 
System operation
Batching control by controller panel
Upper computer control material batching, material discharge rate and material flow rate.
Indicator display cumulant, instaneous value and output values.
Indicator display cumulative values of white and night shift, 2 years cumulant
Indicator display more than 20 kinds of work status and indicates error status.
Manual or automatic control function
Indicator output PID control signal and instantaneous flow current signal
Communication interface RS485
 
 
Work principle
 
The indicator of weight drop scale adjust the discharging screw machine according to velocity of the weight loss.
 
Indicator adjust the rotate speed of screw machine according to velocity of the weight loss, fixed quantitative discharging screw quickly start fast feeding device when the weight of weighing material is less than weighing lower limit, it will stop when it reach the weighing limit on time.
 
controlling discharge screw machine speed according to the material weight reduction rate in weighing hopper, in order to achieve the purpose of quantitative feeding, therefore it calls weight drop scale.
 
When the material in weighing hopper reached the lower limit, the discharge rate of the screw machine will be as it fixed, the material of silo will flow into weighing, therefore, it decreases feeding time and it also improves the control precision of the weighing accuracy.

Weight Drop Scale and Conveyor Check Weigher

A Weight Drop Scale is an industrial weighing and inspection machine designed to measure the weight of products or packages automatically as they pass through a production or conveying line. Combined with a Conveyor Check Weigher or Weight Sorter, the system can identify products that are underweight, overweight, or within a predefined target range.

The equipment is commonly used for automated quality control, production-line inspection, packaging verification, weight classification, and material sorting. It can continuously weigh products without requiring operators to stop the production line for manual measurement.

A modern Check Weight Machine typically combines a conveyor system, load cell, weighing controller, sensor, display interface, and automatic rejection or sorting mechanism. This allows manufacturers to monitor product weight in real time and automatically separate products according to programmed weight limits.

What Is a Weight Checking Scale?

A Weight Checking Scale is an online weighing system that verifies the weight of individual products during production, packaging, or material handling.

Products are transported onto the weighing conveyor, where a high-speed weighing sensor measures the product weight. The controller compares the measured value with preset upper and lower weight limits.

Depending on the result, the product can be classified as:

Underweight
Within target range
Overweight
Accepted
Rejected

An automatic rejection system can then remove products outside the specified weight range without interrupting the main production flow.

This makes the equipment useful for both quality inspection and automatic production management.

How Does a Conveyor Check Weigher Work?

The operating process normally includes product detection, weighing, data processing, and sorting.

First, products enter the conveyor through an upstream production or packaging machine. A photoelectric sensor detects the approaching product and coordinates the weighing cycle.

The product then passes over the weighing section. A load cell measures the dynamic weight while the conveyor maintains controlled movement.

The electronic controller processes the load-cell signal and calculates the product weight. The measured result is compared with the programmed target range.

If the product meets the required specification, it continues along the production line. If it is underweight or overweight, the controller activates the appropriate rejection mechanism.

Depending on the application, rejection may be performed by an air blast, push arm, drop mechanism, diverter, flap, or other sorting device.

Weight Drop Scale and Weight Sorter

A Weight Sorter combines weighing with automatic classification. Instead of simply displaying product weight, the system can assign products to different categories.

For example, products may be divided into several weight ranges:

Grade A: 900–1,000 g
Grade B: 800–899 g
Grade C: 700–799 g
Reject: Below or above specified limits

The actual weight ranges depend entirely on the production requirements.

This function is useful for agricultural products, food products, packaged goods, industrial components, parcels, and other products that need automatic weight classification.

Main Components

A typical Check Weight Machine includes:

Infeed Conveyor
Weighing Conveyor
High-Precision Load Cell
Photoelectric Sensor
Weighing Controller
Digital Display
Conveyor Drive Motor
Conveyor Belt
Automatic Rejector
Weight Sorting Device
Control Cabinet
Emergency Stop System
Communication Interface

The conveyor dimensions, load-cell capacity, belt material, motor, rejection mechanism, and control system can be selected according to product size, weight, speed, and production environment.

Online Dynamic Weighing

One of the main advantages of a Conveyor Check Weigher is its ability to perform dynamic weighing.

Traditional static scales require the operator or production system to stop a product before weighing it. An online checkweigher measures the product while it is moving through the production line.

This can significantly improve inspection efficiency in automated production environments.

Dynamic weighing is suitable for high-throughput operations where products need to be inspected without reducing conveyor speed or creating unnecessary production interruptions.

The controller can also record weight information for production analysis, process monitoring, and quality management.

Applications
Food Processing and Packaging

Checkweighers are widely used to verify the weight of packaged food, meat, seafood, vegetables, fruit, snacks, frozen foods, and other consumer products.

Pharmaceutical Packaging

Where suitable for the specific production environment, checkweighing systems can verify the weight of packaged products and identify products outside predefined limits.

Consumer Goods

The machine can inspect packaged household products, personal-care products, containers, and other consumer goods.

Logistics and Parcel Handling

Conveyor checkweighers can be integrated into logistics systems to verify parcel weight and support automated sorting operations.

E-Commerce Fulfillment

Online weight checking can help fulfillment centers verify packages before shipping and integrate weight information with automated handling systems.

Agricultural Products

The weight sorter function can classify fruits, vegetables, poultry, fish, and other agricultural products according to weight ranges.

Industrial Manufacturing

Manufacturers can use check weight machines to inspect components, assemblies, packaged parts, and finished products.

Chemical and Bulk Packaging

The system can check the weight of bags, containers, bottles, boxes, and other packaged chemical or industrial products.

Key Advantages
Automatic Weight Checking

The machine continuously checks individual products without requiring manual weighing.

Dynamic Weighing

Products can be weighed while moving on the conveyor, supporting high-speed production.

Automatic Weight Sorting

Products can be classified according to programmed weight ranges.

Underweight and Overweight Detection

The system can identify products that fall outside acceptable weight limits.

Improved Production Efficiency

Automated inspection reduces the need for manual weighing and helps maintain continuous material flow.

Consistent Quality Control

Online weight monitoring provides a repeatable method for verifying product weight throughout production.

Easy Integration

The checkweigher can be connected to conveyors, packaging machines, filling machines, labeling equipment, PLC systems, and other production equipment.

Data Management

Depending on the control configuration, weight information can be displayed, stored, transmitted, or integrated with factory management systems.

How to Choose a Check Weight Machine

Several factors should be considered before selecting a Conveyor Check Weigher.

Product Weight: Specify minimum, average, and maximum product weights.

Product Dimensions: Provide product length, width, height, and shape.

Conveyor Speed: Required throughput and product spacing determine the appropriate weighing and conveyor configuration.

Required Accuracy: Define the acceptable weight tolerance for the application.

Product Characteristics: Wet, sticky, dusty, fragile, irregular, or unstable products may require specialized conveyor and weighing designs.

Sorting Requirements: Determine whether the system only needs pass/fail checking or multiple weight classification.

Reject Method: Air blast, pusher, drop mechanism, diverter, and other rejection methods can be selected according to the product.

Production Environment: Stainless steel and hygienic designs may be required for food or pharmaceutical applications.

Installation and Maintenance

The weighing conveyor should be installed on a stable and level structure. External vibration, mechanical interference, air movement, and contact with surrounding equipment should be minimized because these factors can affect dynamic weighing performance.

The conveyor should be properly aligned and the belt tension should be adjusted according to the manufacturer's requirements.

Routine maintenance should include inspection of load cells, conveyor belts, rollers, bearings, motors, sensors, electrical connections, and rejection mechanisms.

The weighing system should be calibrated and verified periodically. Product buildup should be removed from the weighing conveyor to prevent measurement errors.

OEM and Custom Checkweigher Solutions

As an industrial Check Weigher Manufacturer and Weight Sorting Machine Supplier, we can provide customized online weighing and sorting equipment for different products and production lines.

Customization options can include conveyor dimensions, weighing range, load-cell capacity, conveyor speed, belt material, display system, reject mechanism, number of sorting categories, control cabinet, PLC interface, data communication, and machine construction.

For food, pharmaceutical, chemical, logistics, and general industrial applications, the equipment can be configured according to the required hygiene, environmental, and production standards.

OEM branding and custom production-line integration are available for international B2B customers.

Why Choose Us?
Professional industrial checkweighing solutions
Dynamic online weight measurement
Automatic underweight and overweight detection
Weight sorting and classification options
Customized conveyor dimensions and speeds
High-precision load-cell weighing technology
Automatic rejection systems
PLC and production-line integration
OEM and custom manufacturing available
Factory-direct B2B supply and technical support
FAQs
1. What Is a Weight Drop Scale?

A Weight Drop Scale is an automated weighing device designed to measure products or materials during a production or conveying process, with configurations available for weight checking and sorting.

2. What Is a Conveyor Check Weigher?

A Conveyor Check Weigher is an online weighing machine that measures individual products while they move along a conveyor.

3. Can It Detect Underweight Products?

Yes. The controller can be programmed with minimum and maximum weight limits and identify products that fall outside the acceptable range.

4. Can It Sort Products by Weight?

Yes. A Weight Sorter can classify products into different weight ranges and automatically direct them to different discharge channels.

5. Can Products Be Weighed While Moving?

Yes. Dynamic weighing technology allows products to be weighed while traveling across the weighing conveyor.

6. What Industries Use Checkweighers?

Common applications include food, packaging, pharmaceuticals, logistics, agriculture, consumer goods, chemical products, and industrial manufacturing.

7. Can the Machine Automatically Reject Products?

Yes. Air-blast, pusher, drop, diverter, flap, and other rejection mechanisms can be configured according to product characteristics.

8. Can It Be Connected to a PLC?

Yes. The weighing controller can be configured for PLC, industrial automation, production-line communication, and data management systems.

9. Can the Check Weigher Be Customized?

Yes. Conveyor size, weighing range, speed, load cells, control system, sorting method, rejection mechanism, and machine construction can be customized.

10. What Information Is Needed for a Quotation?

Provide product weight range, product dimensions, required throughput, conveyor speed, weighing accuracy, product characteristics, number of sorting categories, and production-line layout. These parameters help determine the appropriate checkweigher configuration.