Brushing Units for Cleaning Conveyor Belts

Cleaning system for conveyor belts with engine and brushing unit UST
The belts that convey every type of material require a frequent maintenance because, if the residues are not removed immediately after the point of discharge, these will accumulate on the pulleys and on the guide rollers causing wearing and damages to the belts themselves. The Brushing Unit are designed and manufactured by SIT to obtain a radical cleaning of the belts, to avoid the inconveniences verified with cleaners of traditional type. These patented systems for belts cleaning have assembled as brushing gear a special cylindrical shaped brush with helical segments (strip) (see constructive form Master Rollers).

Brushing Unit for Conveyor Belts

Brushing Unit mounted on rubbered conveyor belt

Brushing Unit are made of a modular frame on which are mounted the brush and the engine. The frame can be fit to the conveyor belt’s structure by means of bolts
The engines usually mounted are asynchronous three-phased engine, 3 PH 220-380 V. Tension, 50Hz, closed construction, external ventilation and rotor. Protection IP44. B5 construction forms for UST type and B3 for USLT. The brush is operated by an electrical engine by means of a driving belt (USLT) or a geared-engine with helical coaxial gears with elastic joints (UST).

Lateral view	of brushing unit

The brush pressure regulation can be adjusted by the lateral eye pulling rods. The body of the brush consists of a steel shaft carrying turned cast iron disks, on which the Strip brushes are mounted using aluminum dowels screwed on them.

Brushing Unit UST

Brushing Unit Light USLT

The standard Brushing Unit in production standard differ for construction methods, for the way the engine is cantilevered-fitted on the motor shaft, and for the way the brushes are are fixed to the frame. In particular there are 2 types:

  • Type standard UST Brushing Unit (with driving gear motor in axis with the rotation axis of the brush). They are indicated for cleaning large conveyor belts and for harder working conditions for the transportation of gummy and humid materials.
    External diameter standard Ø 300 mm. On demand Ø 270-350 mm.

  • Type Light USLT Brushing Unit (the engine is not in axis with the brush, fastening system lighter but it is more complicated to change the brushes). They are indicated for smaller conveyor belts, for light jobs and when there are difficulties of installing.
    External diameter standard Ø 200 mm. On demand Ø 180-260 mm.
Brushing Unit customized with bevel brush and non linear strip

On demand we can manufacture also Brushing Unit with special size and special power supply, using specific types of filament and of structure to satisfy the brushing and mounting needs of the customer.

Adjustment of Belt and Brushing Unit

The Brushing Units must be mounted in parallel with the conveyor belt (pls. see picture), exactly where the belt leaves the head-drum or immediately behind the vertical of the drum axle making sure that the supports are aligned. If the Brushing Units are mounted in any other positions, an idle roll must be placed against the other side of the belt, so that the brush operates where the belt is tight. The power supply must be provided so as to start and stop both brush and conveyor belt at the same time. It is recommended to bear in mind that the wires tips are constantly under working stress, therefore an excessive pressure would reduce the brushing effectiveness of the whole unit and accelerate the brush wear-out. The picture shows the correct bending of the filaments and the correct pressure between the brush and the belt.

Detail of the assembling of the brushing unit
Detail of Brushing Unit

For adjusting the pressure it is sufficient to operate upon both side tension rods: this operation is important, because it allows to reduce the strip’s wear-out and without affecting thand cleaning operation of the conveyor belt. The strip brushes replacement is very simple and does not require disassembling the metal body. It is sufficient to screw-out the wedges held by a set of screws, then pull the brushes out either side ways or radial ways, depending on how you can grab them best. The rotation speed of the brush must be carefully selected in accordance with both the conveyor belt’s speed and the type of the material to be removed. The rotation direction of the Brush and of the conveyor belt must be opposite.

Table for the selection of the Standard Brushing Unit UST

Giri Brush 200 ÷ 400 / 1’
TypeBelt widthAØDØdI MaxXHPBCE
UST 4004003803528601000153724073
UST 5005004803528601000153724073
UST 6006005803528601000153724073
UST 7007006803528601000153724073
UST 80080078040388013251,560424275
UST 90090088040388013251,560424275
UST 1000100098040388013251,560424275
UST 11001100108050421101880262925083
UST 12001200115050421101880262925083
UST 13001300125050421101880262925083
UST 14001400135050421101880368525083
UST 15001500145050421101880368525083

Brush RPM > 400 / 1’
1,560424073UST 400
1,560424073UST 500
1,560424073UST 600
1,560424073UST 700
262924275UST 800
262924275UST 900
262924275UST 1000
368525083UST 1100
368525083UST 1200
368525083UST 1300
470625083UST 1400
470625083UST 1500

Request for Offer

For the Request for Offer of the Brushing Unit you need to indicate:

  • Type of Brushing Unit – Conveyor Belt Width
  • Dimension X (the foot support’s interaxis tied up to the conveyor)
  • Rotation speed of the brush (see attached chart)
  • Technical characteristics of the electrical engine
  • Type and nature of the material to be removed and speed in m./sec.

Example: a Brushing Unit type UST 700/900 x 388 rounds (i.e. an UST type 700, “X”=900 mm., rotating speed=388 round/min.), electrical three-phased engine 220-380 V., 50 Hz. The hypothesis expects the conveyor to carry carbon particles at 2m./sec.

All the Brushing Units supplied by S.I.T. comply with the machinery coarse 89/392/EEC.
Every Brushing Unit is provided with a User Manual, the Test certificate and the “Incorporation’s declaration”.
Every Brushing Unit on demand can be provided with joint protection properly fitted on the UST as flexible coupling; on the USLT for protecting the belt cone pulley.

Graphic RPM - Speed - Material

Graphic for the choice of the brush speed depending on the type of material chosen

Below is a diagram showing how to choose the correct speed when using a 300 mm external diameter brush, depending on the conveyed material. In abscissa: speed of the conveyor belt m./sec. In ordinate: round/min. of the brush. In order to determine the speed reducer, it is suggested to round the speed reading off up to the closest reading available in the market.

Table for the selection of Light Brushing Unit USLT

TypeBelt widthAX MaxRPMHP
USLT 4004003806005600,75
USLT 5005004807255600,75
ULST 6006005808505601
ULST 7007006809505601

TypeStripNo. StripØ Standard
P.P.L Wire*
H StripTrim

* On demand SIT offers different section diameters and filament type.

Have you seen what type of Brushing Unit could be interesting to you? Contact Us and the experts of our Technical Office will help you identify the product that suits your needs best!