SU767543A1 - Sedimentation-type balance for fine powders - Google Patents

Description

one

The invention relates to the field of weighing technology.

Devices for the sedimentation analysis of fine powders are known, j containing a rocker, a suspension vessel, a sedimentation tray 1.

The closest to the invention in its technical essence is a device containing a magnetic sub-jQ assembly node, a weighing system, a suspension vessel, a platform for sediment L2.

However, this device is not: the prosperity that the suspension is immersed in a suspension at the interface between the media and the surface tension of the liquid, and the error due to evaporation of the liquid has not been eliminated.

The purpose of the invention is to increase the accuracy of.-Q ability in the analysis of thin particles for. through the complete elimination of the surface tension forces of the hydrostatic environment.

This goal is achieved by the fact that the magnetic suspension assembly 25 is made in two parts, the upper and lower parts, with the upper part of the suspension mounted on the load-carrying arm of the weighing system, and the lower part is fully immersed in

slurry and associated with sediment pad.

FIG. 1 is a diagram of the scales; FIG. 2 is a block diagram of the next magnetic suspension.

The beam 1 on the axis of rotation 2 is equipped with a system 3 of following automatic balancing of the static type. The right shoulder of the rocker arm is equipped with a hinge 4. The magnetic suspension assembly 5 consists of two parts: upper b and lower 7.

The upper part of the suspension carries the rail 8 for the built-in weights 9, controlled by the levers of the kettlebell mechanism 10, and the lower part - the rod 11 with a fixed platform 12 for sediment. The entire lower part of the suspension 7 is completely immersed in a stack; an 13 with a suspension of 14, with double walls for pumping through the holes 15 the temperature of the agent to be glutinous. To prevent moisture from evaporating, the beaker 13 is closed with a sealing lid 16 of non-metallic material, for example, glass.

Claims (2)

The block diagram of the tracking magnetic substrate (Fig. 2) contains a high-frequency generator 17 (2-5 MHz) with a control coil 18 located on the upper open portion of the b, imey, and, in addition, an iron core 19 20 and a permanent magnet 21 All elements 18-21 are enclosed within a ferromagnetic beaker. The counterpart of the magnetic pendant contains a ferromagnetic cup 22, the upper part of which is covered by a copper lid 23 acting on the control coil 18. Inside the cup 22 a permanent magnet 24 is enclosed, having polarity on the attraction to the magnet 21. The signal of the generator 17 is rectified the detector 25 is amplified by the amplifier 26 and, in the form of direct current, through the resistance of the amplifier 27, is fed into the winding 20 of the electromagnet. Since the electromagnet is 21 pa; lays on the suspension of the balance, its heating by the current of its winding is unacceptable, therefore the Noload circuit is following; an automatic device 28, the reversing motor 29 of which introduces a second control signal to the generator 17 through the blocks of capacitors 30 so that the current in the resistor 27 is always near the zero level. In this case, the suspension of the lower part 7 of the suspension is provided only by the force of attraction of the permanent magnets, and the current in the winding 20 serves only to prevent them from sticking together or falling. The device works as follows. The bottom part 7 of the magnetic suspension 5 with the rod 11 and the platform 12 is introduced into the glass 13 with the suspension 14 and closed with the lid 16. The heat-stabilized agent is pumped through the holes 15. Then the scales are turned on, the cup 13 is brought under the part 6 of the magnetic suspension 5 and the holder is disconnected. When this occurs, part 7 is captured. Open the isolator and, after some time, the static-static system 28 will bring the static system into a state in which the direct current in the resistor 27 will be near the zero level. As the mass of sediment increases at site 12, the distance between parts 6-7 of the suspension automatically decreases. Claims Sedimentation scales for fine powders containing a weighing system, a suspension vessel, a platform for seDiment, and a magnetic suspension assembly, characterized in that, in order to improve the accuracy in analyzing fine powders, the magnetic suspension assembly is made of two parts — the upper and lower The upper part of the suspension is fixed on the load-bearing shoulder of the weighing system, and the lower part is completely immersed in the suspension and is connected with the platform for sediment. Sources of information taken into account in the examination 1.Sarakhov A. I. Libra in physicochemical studies. M., Science 1968, p. 111-115. 2. Sedimentadionny scales. Model 4601. Prospectus Sartorius, Germany (prototype).