Conveyor Strain Gauge Scales

VKM-2T

Purpose

The scales are designed for continuous automatic measurement and indication of flow rate and cumulative total mass of bulk and lump materials transported by belt conveyors in various production industries.

Application Area

The scales can be used in technological lines, in stone and ore quarries at processing plants of metallurgical and lime-cement production, for loading and unloading operations of trucks and railway cars.

Data Transmission Capabilities

Data to external devices (PC and displays)
Discrete signals (reception and output of 4 channels each), used in process control systems
Normalized current (0-5, 0-20 or 4-20) mA, proportional to current performance, with possibility of integration (smoothing) of this signal

Technical Specifications

1. Accuracy class of scales:
- with automatic belt tensioning device on the conveyor, absence of belt thickening at the joint and absence of adhesion
0,5; 1,0
- when the listed conditions are not met
2,0
2. Indicated parameters in operating mode:
- productivity (t/h)
- material mass by cumulative total (t)
3. Discreteness of reading for cumulative total indication
10, 100, 1000 kg
4. Time to reach steady operating mode
not more than 2,0 min
5. Compensation of unloaded belt mass
automatic
6. Range of linear densities of weighed material
up to 10000 kg/m
7. Permissible overload from maximum linear density of material
not more than 50%
8. Operating mode control
by program from keyboard
9. On call from keyboard displays:
- conveyor belt length, m
- speed control pulse price, mm
- conveyor belt speed, m/s
- linear load of empty belt and with material, kg/m
- correction coefficient
- conveyor number (address) of scales
10. AC power supply:
- voltage
(220 +33 -22) V
- frequency
(50 ±1) Hz
11. Power consumption
not more than 10 VA
12. Protection degree of scale block housings
IP53
13. Average service life of scales
not less than 10 years
Warranty
18 months

At the Customer's request, the scales can be equipped with an electrical mounting cabinet with dimensions not exceeding 800×600×350 mm, in which the signal processing unit (SPU) and auxiliary switching equipment (circuit breakers, isolation transformer, fuses, socket, terminal blocks and selector switches for choosing the connection scheme of sensors and control circuits to SPU) are installed.

The company provides services for supervision of installation and maintenance of supplied scales.

Equipment Parameters

Conveyor type
trough or flat
Transport belt width
from 400 to 3000 mm
Side roller inclination angle
up to 30 degrees
Maximum productivity
up to 10000 t/h
Conveyor belt speed
up to 5 m/s
Minimum permissible distance from conveyor loading point to unloading point
4 m

Operating Conditions

Ambient temperature
from -20 to +60 °C
Relative humidity at 35°C
up to 95%
Vibrations in frequency range
from 10 to 55 Hz
Vibration amplitude
up to 0,35 mm
Maximum distance SPU from WS
not more than 50 m