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Weighbelts

Weighbelts are flat belt conveyors with weighbars beneath the belt to measure product flow. Knowing product weight and convey-rate, we use weigh-beltsto meter product into systems such as mixers that need to be fed at a certain rate. In hemp systems, we use weigh-belts between the shredder and the dryer because consistent feed-rates are critical for any continuous-flow herb drying processes to prevent burning product or leaving wet spots. They can also be used in various parts of the process to provide a number of data points such as moisture and loss-in-weight.

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Weighbelt transparent

When entire processes depend on weight-based yields, weighing throughout the process can lead to further efficiencies and greater output. Weighbelts can measure incoming product as it flows into the dryer, protecting against over or under-drying. This leads to more consistent dried product, proper temperature stabilization, and more predictable yields. Metering weight after drying can govern conveyor speeds throughout the process to ensure optimal throughput and anticipate batching outcomes.

Models with 12” and 24” belt widths, BIC (belt weight influence compensation), and accuracies of ± 0.25% to 1% of set rate sigma are available. A v-profile belt guide provides reliable tracking and minimal hardware requirements while a gravity-assist head pulley scraper and an internal plow automatically clean both sides of the belt. Weighbelts can control the flow of up to 2,660 cubic feet per hour.

Specs. And Description of an Example Weighbelt

We use different weighbelts for different applications. But for example's sake, below are the specs of the pictured weighbelt, and you can see how the weighbelt looks in real life here.

Specifications

For weighing and moving 20,000lbs/hr of leafy biomass at 35lbs/ft3 bulk density.

  • 2B finish
  • Drive Motor: 460VAC/3 Phase/60 Hz; Instrumentation: 100-240VAC/1 Phase/50-60 Hz - (350W max).
  • 82 inches centerline of head pulley to centerline of tail pulley length.
  • 24 inch belt width.
  • Left- or Right-hand belt removal.
  • 304 stainless steel frame construction with mill (2B) finish.
  • 304 stainless steel product contact surfaces with mill (2B) finish.
  • 5-inch diameter “V” groove head pulley drum with FDA approved smooth Nitrile lagging.
  • 5-inch diameter “V” groove, self-cleaning, caged tail pulley.
  • Latch operated telescoping belt take-ups.
  • FDA approved stainless steel bearings.
  • Full length product containment skirts with fixed gap gradient.
  • 24 inch wide FDA approved 2-ply cotton/polyester endless belt rated tensile strength of 28 PIW complete with white Buna-N top cover, friction bottom and “V” groove guide. Belt rated for material temperatures from 20º F to 212º F.
  • Counter-weighted UHMW blade belt scraper.
  • Blade style weigh bridge with electronic load cell.
  • Weigh Bridge alignment tool.
  • Hollow shaft velocity encoder.
  • Tail pulley guards.
  • Calibration test weight with onboard storage.
  • 200 mm H x 150 mm W x 120 mm D Type-4 / IP66 polyester powder coated mild steel enclosed Universal Junction Box (UJB) factory mounted to weigh belt frame and pre-wired to load and speed transducers.
  • 5 HP flange  mount,  right  angle  SEW  Eurodrive  helical-worm gearmotor with 6:1 constant torque speed range.
  • Gear motor drip pan.
Make

THAYER
Model MWF-OS-24
Throughput 20,000 lbs./hr.
Power 460VAC/3 Phase/60 Hz; Instrumentation: 100-240VAC/1 Phase/50-60 Hz - (350W max)
Width 24"
Made In USA

Notes

  • When standing at inlet of weigh belt, watching material move away from you, drive can be installed on the left or right side of weigh belt frame.
  • Provides an accuracy of ±½% of totalized weight based on a minimum sample of one (1) minute or two circuits of the belt, whichever is greater or ±¼% to ±1.0% of set rate at 2 sigma based on 30 consecutive one (1) minute samples. Accuracy may vary depending on material flow characteristics.
  • THAYER Scale S52i Instrumentation System (Product Code IN-S52i) system complete with: 300 mm H x 250 mm W x 150 mm D Type-4 / IP66 painted mild steel enclosure with foot mounting kit and slotted screw enclosure latch.
  • Embedded PC (EPC).
  • Operator Interface (OI).
  • Mass sensing processor.
  • Velocity sensing processor.
  • Belt Integrator Application Software.
  • Native Ethernet/IP - Modbus/TCP (field wiring to RJ45) Device Level Interface.

Instrumentation Notes:

  • S52i provides rate measurement and totalization. Rate control, if required, by user’s PLC.
  • S52i must be mounted within 1,000 feet (total wire length) of belt scale.
  • S52i provides the following discrete inputs and outputs:
  • Analog Outputs: AO 1 (User Selectable)
  • Digital Inputs: Drive Status (Factory Set)
    • DI 1 (User Selectable)
    • DI 2 (User Selectable)
    • DI 3 (User Selectable)
  • Digital Outputs: Totalizer (Factory Set)
    • DO 1 (User Selectable)
    • DO 2 (User Selectable)
    • DO 3 (User Selectable)

Tell us about your project to let us find the right weighbelt for you and integrate it into your system!