Position: This article's content is about increasing the batching accuracy of the weigh hoppers and eliminating adhesion of materials to the working surfaces of process equipment.
It was shown that weighing hopper batching equipment with antiadhesive lining plates not only increases the batching accuracy and output of the equipment but also increases its trouble-free operation.
To ensure the required quality of the finished product at enterprises in the construction materials industry, great importanceis attributed to measures that improve the accuracyof batching raw materials and fillers. However, in operating with wet materials, they intensively adhere to the working surfaces of the weighing hopper batchers, which interferes in fulfillment of its functions of an accurate measuring instrument.
To prevent adhesion, many companies use electric vibrators,which vibrate the metal walls of the weigh hoppers. As experience has shown, the effectiveness of such vibrators is extremely low because it is difficult to subject the adhering materials to vibration cleaning. The opposite effect of thickening and even greater growth of the layer of raw materialstuck to the weigh hopper walls frequently takes place.
Hydrop hobization with polymeric antiadhesive lining plates (PALP) of different execution is currently the most effectivemeans of controlling adhesion of various raw materialsto the working surfaces of process weighing equipment [1 – 3].Basic performance characteristics of palp suppliedby As-Tik KP Ltd.
Contact angle of wetting, deg . . . . . . . . . . . . 85–90
Friction coefficient:
on steel . . . . . . . . . . . . . . . . . . . . 0.10 – 0.15
on raw materials. . . . . . . . . . . . . . . . 0.35 – 0.45
Wear resistance, rel. units:
PALP OE (ordinary execution). . . . . . . . . 400–500
PALP IWIS (increased wear resistance
and impact strength). . . . . . . . . . . . . . . . . . 200
PALP HWI (high wear resistance
and impact strength). . . . . . . . . . . . . . . . . . 100
PALP OE were introduced and are being effectively usedat Voronezh Cera mics Factory PCF Co. on the working surfaces of three weigh hopper batchers (one on a weighingtruck, two stationary); six hoppers with a volume capacity of20 m3 filled according to Sakmi plans (Italy); two domestic hoppers for clay.
As a result of the measures instituted on lining the working surfaces of the weigh hoppers, the materials did not stick to thewalls of the hoppers (Fig. 1), the vibrators were removed,manual labor used in cleaning was eliminated, the batching accuracy improved, and maintenance of the hoppers was eliminated (the use of vibrators and their impact actions onthe walls destroyed the walls and welds).
The most frequently used version of attaching PALP tothe walls of process equipment is shown in Fig. 2.
Fig. 1. Movement of material along the walls of an unlined (a) and PALP-lined weigh hopper (b ).
A. V. Malinov,1 V. N. Polukhin,1 Yu. V. Khmelev,1 V. G. Kuznetsov,1 and I. P. Kuznetsov1
