Belt Scales

WTS2 Dual Idler Belt Weigher

Web Tech AutoWeigh manufactures a comprehensive range of conveyor belt scales for nearly all applications. Also known as weightometers and belt weighers, Web Tech has classified it’s belt scales into three categories:

• “Process” conveyor belt scales
• “Inventory” conveyor belt scales
• “Precision” conveyor belt scales

The model of conveyor belt scale required depends on the application requirements and the conveyor design. Our Belt Scale Installation Guide will provide guidelines on belt scale installation requirements.

Many belt scale applications also require a conveyor Metal Detector. Web Tech AutoWeigh can also supply these if required.

A belt scale system normally comprises of the following items:

• Weigh frame with load cells
  

  Weigh frame with idlers and Calibration Bars

• Electronic integrator/controller
• Speed sensor or digital encoder (tachometer)
• Weigh quality idlers
• Calibration equipment

Belt Scales for the Coal Industry

Should you require a proposal from us for any application you may have, please complete as much of our Belt Scale Application Data Sheet as is known, and we would be pleased to provide our recommendations.

 Process Conveyor Belt Scales

• Used in light to medium duty applications with belt loadings up to 50 kg/m
• Single idler weigh frame
• Mild steel galvanised construction, optional stainless steel
• Belt widths from 300 mm up to 1050 mm
• Conveyor belt scale kit offered complete with electronics, load cell and speed sensor
• Optional belt scale weigh frame only, to retro fit older conveyor belt scales
• Weigh quality idlers. Priced separately *
• Accuracies of ±1.00% to ±3.00 % depending on the application and material type

Inventory Conveyor Belt Scales

Used where accuracies from “process” belt scales are not achievable on processes such as the monitoring of material deposited onto a stockpile and monitoring of material deposited into trucks.

• Dual idler mild steel galvanised construction, optional stainless steel
• Available as 1000, 1200 and 1500 mm standard idler spacings. Other spacings are available as an option
• Belt widths from 450 mm up to 1200 mm
• Conveyor belt scale kit offered complete with weigh frame, electronic integrator, load cells and speed sensor
• Optional belt scale weigh frame only, to retro fit older conveyor belt scales
• Weigh quality idlers are priced separately *
• Accuracies of ±0.5% to ±1% are typical depending on the application and material type

Precision Conveyor Belt Scales

Used in applications where very accurate results are required. These could include ship loading, train loading, wheat storage and custody transfer.

• Four, six and eight idler galvanised mild steel construction
• Optional stainless steel
• Previously supplied up to 10 000 MTPH
• Belt widths up to 2400 mm
• Standard models are available for 1000, 1200 and 1500 mm idler spacing. Other spacings are available as an option
• Conveyor belt scale kit offered complete with weigh frame, electronic integrator, load cells and speed sensor
• Optional belt scale weigh frame only, to retro fit older conveyor belt scales
• Weigh quality idlers are priced separately *
• Accuracies in the order of ±0.25% are typical depending on the application, material type and belt scale type

Special Applications: Conveyor Belt Scales

• Specifically designed to suit a certain application, Applications such as mine structure conveyors
• “Sanki” type conveyors
• Complete turnkey design and manufacture using the latest technology
• Accuracies would depend on the application and material type

Electronic Integrator and Controller

Web Tech AutoWeigh also design and manufactures its own range of electronic integrators that can be used with all models of conveyor belt scales. Each of the models has different features, providing alternative solutions to the application requirements. We can retro fit any brand of belt scale or weightometer.

Standard Features:

• Automatic calibration
• Audit trail
• Control outputs
• In-built power supply
• IP66 reinforced polyester enclosure

Additional options include:

• Stainless steel enclosures
• Sunshades
• Serial communications (Profibus, Device Net & Ethernet IP/Modbus TCP)
• 12/24 VDC power supplies
• 485/232 output

The standard models for most applications are our “Masterweigh 6”, “Masterweigh 7” and “Novus”. For specialised applications the “Optimus” controller is used.

Speed Sensors/Digital Encoders

Web Tech AutoWeigh provides a wide range of speed sensors/digital encoders to accommodate most situations in providing a pulsed output for all belt scale integrators. We can also retrofit any existing system with this equipment.

Our range includes:

• Web Tech stainless steel rotary shaft encoder or tachometer speed sensor
• Magnetic pick up sensor and bolt on sprocket
• Proximity Speed sensor with weld on target
• Precision self-cleaning spiral pulleys are available using our tachometer or proximity sensor
• Trailing arm sensor

Calibration Equipment

Web Tech AutoWeigh also design and manufacture a range of different styles of calibration facilities. As maintenance time on many sites is limited, a method of applying calibration weights quickly and simply is required. Web Tech can supply calibration weights for any belt scale regardless of the manufacturer.

• Standard calibration bars are normally stored below the weigh frame for easy access
• Our “In-Situ” weights are permanently installed above or below the weigh frame and are simply wound up and down by a single person when required
• Other designs to suit other manufacturer’s belt scales are also available, such as “billet” style calibration weights
• Calibration chains are also available with electric winch and storage trough facilities

Weigh Idlers

The use of in-line weigh quality idlers is recommended for most applications with accuracies over 1%

The idler manufacturer can supply the specifications and we can manufacture them at the same time as your belt scale to suit the application.

The total amount of weigh quality idlers depends on the selected belt scale model.

Two sets of weigh quality idlers are used in the approach, and the retreat to the weigh area.

• Single idler belt scale requires 5 sets: One  (1)  plus two (2) approach and two (2) retreat sets.
• Dual idler belt scale requires 6 sets:   Two   (2)  plus two (2) approach and two (2) retreat sets.
• Four idler belt scale requires 8 sets:    Four (4)  plus (two 2) approach and two (2) retreat sets.
• Six idler  belt scale requires 10 sets:   Six   (6)  plus (two 2) approach and two (2) retreat sets

These idlers are custom built to suit the application, as inline idlers with balanced rolls to reduce vibration & Jacking screws (optional cam adjustment) to assist with onsite levelling.