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Scale for conveyors

Tensometric scale for conveyors

Type TPV – 400 . . . . . . 1400

The construction of the scale is adapted for building in belt conveyors of various types and tilts. It enables continuous monitoring of the transported quantity, both the instantaneous value and the total amount in the specified time (weight of batches). The measured values (weight, operating hours etc.) can be transferred from the evaluation electronics to the PC (notebook) by means of the supplied cable (so called local transfer) or by means of the GSM network (so called remote transfer). In the PC the data are processed by means of the "Stone Breaker" program. The conveyor scale is used especially for the following applications: check of supplied or processed quantity (wagons, crushers etc.), control of the required amount of material on the technological lines, long-term balancing of consumption or production, batching of the prescribed quantity of raw material, maintenance of the mixing proportion of two or more raw materials.

Tensometric scale for conveyors

The construction arrangement of the sensor part is on Fig. 1. The adapted set of rollers – weighing – which transfers the instantaneous load of the belt to the tensometric sensor, is built in a suitable place among the existing bearing rows of rollers of the conveyor. In some more complex cases there can be even two rows of rollers sensing the load of the belt in the measuring section. The set includes also the sensor of revolutions for evaluation of the instantaneous speed of the belt.

The electronic equipment and the weighing unit are located in a metal dustproof box of the dimensions of 250 x 300 x 210 mm (w x h x d). The industrial terminal with a four-line display and a membrane keyboard. by means of which the operator performs the operations necessary for the correct functioning of the scale (e.g. taring), is located on the front side of the box. The basic information about the weighing process is displayed continuously on the display (see Fig. 2).

Vyhodnocovací část

The sensors and the evaluation electronics enable measuring of weight with an accuracy of 0.03% (3000 division lines). As a result of various operating conditions (variable toughness of the belt, vibrations of the conveyor, bigger temperature oscillation, changes of tilt, etc.), the achievable accuracy in the operation is  1% to  2% of the transported quantity.

When utilizing the extending accessories of the evaluation electronics consisting of the technical and program equipment for the local transfer (via the cable) or remote transfer (via GSM), it is possible to transfer the information about production to the PC (notebook) with installed program "Stone Breaker". On the basis of the information the "Stone Breaker" program enables to:

  • view the currently measured values (display of the industrial terminal)
  • display the table of the hourly output of the conveyor (machine)
  • display the table of operating hours of the conveyor (if the instantaneous output of the conveyor is higher than minimum)
  • enter the minimum output of the conveyor
  • display the table of the total output of the conveyor in dependence on the order or the mobile machine
  • create a balance report for each order
  • display and print the above mentioned tables
  • further process in the EXCEL program according to individual requirements of the operator (e.g. create graphs)

Technical Parameters

  • Width of the conveyor belt: from 400 to 1400 mm   (other dimensions on request)
  • Transported quantity: up to 1000 t/hour
  • Belt speed: from 0.1 to 3 m/s
  • Scale design: one line of rollers or two lines of rollers
  • Belt tilt: 0 to 20°
  • Accuracy of sensing of the total quantity: +1,5% at loading from 20 to 100% of the conveyor’s maximum output
  • Supply voltage: 230 V / 50 Hz (or 12 VDC / 24 VDC)
  • Communication interface: RS 232 (or 485)
  • possibility of data transfer from the memory of the evaluation electronics to a portable PC (notebook):
    • locally – via a cable
    • remotely – by means of GSM network

 

Operating Conditions

Sensor part:

  • Ambient temperature: from –10 to +40°C
  • Relative humidity: up to 95%
  • Protection of sensors: IP 65
  • Vibrations: up to 0,3gn
  • Environment: common – basic (other on request)

Evaluation part:

  • Ambient temperature: from -10 to +50°C
  • Relative humidity: up to 90%
  • Protection: IP 55
  • Vibrations: up to 0.15gn
  • Environment: common – basic (other on request)

We supply the scales including the assembly and adjustment (calibration). Owing to various requirements of individual plants it is possible to provide needed construction modifications for each case. The parameters displayed on the display of the industrial terminal can be changed or supplemented according to the customer’s requirements and it is also possible to add acoustic signalling of the defined states, e.g. at overloading of the scale etc. The basic data for processing of the offer are in the attached question form – please fill in and send together with the order. Calibration of the conveyor scale is performed at putting into operation according to a special regulation. In dependence on the operating conditions and proven properties of the batching conveyor scale it is possible to issue a CERTIFICATE about the performed tests and achievable accuracy

ASK FOR THE OFFER MEETING YOUR SPECIALIZED NEEDS.

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