SU658441A1 - Continuous-action viscosimeter - Google Patents

Description

I

The invention relates to instruments for monitoring the state of the technological process according to the physicomechanical parameters of the medium.

A viscosity measuring device containing a hollow cone, on the inner walls of which an electric heater is mounted, is known. The cone is fixed at the lower end of a vertically arranged rod, the upper end of which is freely suspended from a hollow float floating in a vessel with oil.

The float is provided with a sub-boom, which freely moves along a guide fastened in the center of a vessel filled with oil.

The test material is enclosed in a vessel with DOUBLE walls, serving simultaneously as a thermostat. The vessel is movably mounted in the guides and is oscillated in the vertical direction by means of an electric motor, the shaft of which is equipped with an eccentric.

When testing, the cone is lowered into the vessel with the test material, and the material properties are determined by the longitudinal movement of the rod of the cone holder.

A disadvantage of this device is the frequency of measurement, the lack of accuracy in measuring the viscosity of the vibrating systems, since the recorded movement of the float in time will be uneven due to the vibration of the system.

A device for measuring the viscosity of a vibro-fluidized and vibro-boiling layer is known. The viscometer consists of a shoe cylinder, made in the form of a horizontal ring-shaped tray vibrating conveyor, and internal, in the form of a coaxial cylindrical sector 2.

The studied bulk material loaded into the cylinder of the viscometer under the action of vibrational oscillations directed at an angle of 30 to the horizon makes a circular motion, dragging the cylindrical sector in the layer. The current acting at this time on the sector of the vortex, directed tangentially to the path of its movement, is controlled by the twisting angle of the dynamometer. The angle of twisting of the soup is about the magnitude in the box.

The disadvantage of this device is that, in essence, this viscometer is one of the varieties of electromagnetic couplings, and, therefore, stable operation of this viscometer is possible only at fairly high speeds of the viscometer's inner cylinder. The rotor rotating with a fairly large frequency itself makes changes in the structure of the layer, which will especially affect in the study of slow-moving layers. The purpose of the present invention is to eliminate the above disadvantages, as well as to improve the accuracy of measuring the viscosity (including vibration viscosity) of various substances by one device, as well as the possibility of implementing automatic control of process parameters. . The essence of the invention is that the cylinder immersed in the measured medium is connected by a shaft with a disk of non-magnetic material rotating under the action of two magnetic variable flows, one of which is formed by a U-shaped electromagnet with a coil having a relatively small number of turns from the thick wire, and the second stream is formed by a three-rod electromagnet with a coil having a large number of turns of thin wire. The drawing shows a diagram of the device of the continuous viscometer. The device includes an unbalance vibrator 1, a cup 2 with a test medium in which a measuring cone 3, connected by a shaft 4 passing through bearings 5 with a disk 6 of non-magnetic material, is placed. Magnetic fluxes pass through a U-shaped electromagnet 7 and a three-rod electromagnet 8. It is possible to vary the strength of the currents 9, the device operates as follows. Experiments were conducted with various materials. As an example of viscosity measurement, experience is given when measuring the vibration of a Lotus powder. Powder is poured into glass 2 and placed on a platform with an unbalance vibrator 1. A measuring cone is lowered into the powder and current is passed through electromagnets. When current flows through a three-rod electromagnet 8, a magnetic flux 3 arises when current 1 flows through a U-shaped electromagnet 7, an electromagnetic flux ip arises. . These variable flows induce EMF E and E lagging behind these flows by 90 in a nonmagnetic disk.

These EMFs induce in the drive the currents C and In, which are phased in with EgH E.

The instantaneous value of the P-force acting on the disk element with the current i paBHa:

ell-- - -Сс - т Л

F..K-F-3 „KF ...- 91IIik c -einCuji-l-V}. The average for the period value of the force r .:

pfV

Vf 4 "bb5m4r: l3" l.

sin {uut-t4) dt (co5h.

and

90

1 that the angle between i / jj and l (v

Taking into account, y, u1ch ,, (180-v)

Angle between (,, Angle between I qi m.v we find that the forces of interaction of magnetic fluxes Ф | and Фг with currents 1 qi and t qj create the resulting moment of disk rotation

   COS (160-4) +

C2F2 with COA; CI-C05C C-P, i.e. torque is proportional to the applied power.

Thus, the value of D «J at U -cong-t. To which it is necessary to change 3 when you change the Rdsoprivivi environment for this.

so that the speed remains constant, it is possible to promise about the magnitude of vibration.

Claims (2)

1. USSR author's certificate number 165930, cl. Q01 N 11/00, 1964. 2. USSR author's certificate number 133270, cl. G01 N11 / 16, 1960. / U /// ////////////////////,