DD264350A3 - Apparatus for the continuous measurement of rheological values of non-Newtonian fluids - Google Patents

Abstract

The sensor is intended in connection with the illustrated apparatus for the continuous measurement of rheological properties of non-Newtonian fluids, in particular for process measurement in the enterprises of the confectionery industry, but also the processing of liquid rubber and paint and paint production. The aim of the invention is to provide a transducer that measures integrated into a continuous rheological measuring device accurately and quickly and contributes to raw material and working time savings. The invention has for its object to provide a transducer for a continuous rheological measuring device with multi-point measurement. A gear motor drives two blade wheels at constant speed, each with five parallelepipeds. Each cuboid generates a direct or indirect torque when immersed in the material to be measured, which detect corresponding measuring devices. The successively obtained torque-proportional electrical signals are processed by the electronic evaluation unit. It carries out the calculation of the viscosity and flow limit, which are displayed and / or registered by measuring instruments.

Description

Field of application of the invention I

The invention serves for the continuous measurement of the rheological variables viscosity and yield point of liquid and i

pasty non-Newtonian liquids, in particular light and dark chocolate masses. The transducer according to the invention is provided in connection with the Theological device for process measurement in the factories of the confectionery industry, but also the liquid rubber processing and ci? R paint and paint production. !

Characteristic of the known technical solutions

From DE-PS 290987 a discontinuous rheological measuring device is known. A replaceable

The measuring body is driven by a motor at constant speed and once moved through the measuring medium. The as '

Ball trained measuring body is connected via a shaft with the force measuring device. The threat or the length

the Meßgutfahne adhering to the measuring body is a measure of the flow properties. >

This device has the defect that only a single measuring body moves on a non-closed circular path.

It can only be used for the determination of the flow properties of Newtonian media, serves the orienting '

Viscosity measurement with low accuracy on a laboratory scale and does not allow continuous data acquisition.

The device allows only single-point measurements at a long time interval. It is for use in process control

not suitable. The manufacturing process of non-Newtonian media can not be hedged by measurement. This leads to .

Production losses, not optimal use of raw materials expensive import raw materials, the non-compliance of the i

Material consumption standards and a wear increase oer processing machines.

Object of the invention

The aim of the invention is to provide a transducer which, in conjunction with other device elements, permits accurate measurement of the flow characteristics, especially of non-Newtonian fluids, thereby providing control

processing machines with optimized use of raw materials. '

Explanation of the essence of the invention

The invention has for its object to provide a transducer for a continuously operating rheological measuring device with multi-point measurement. !

According to the invention the object is achieved in that the device has a transducer, which preferably j

formed as a paddle wheel assembly and with a anti ieb directly or indirectly coupled. The transducer is j

from one or two odar several paddle wheels. Each paddle wheel is 'symmetrically' dependent on the material to be measured

staggered, not more flexible, the Meßgut displacing, preferably cuboids, of different displacement surface j

stocked. The paddle wheels have the same number but different sizes of displacement bodies in size. D ^! "!

Paddle wheels are arranged offset on a common axis, that a simultaneous immersion of the displacement body is excluded.

Furthermore, the device consists of a direct or indirect torque measuring device, electrical signal converter, j

A / D converter, temperature measuring device and microcomputer. i

A motor, preferably a synchronous geared motor, drives with dependent on the Meßgut, but constant speed!

rotatable transducer, which is preferably designed as Schaufelradanordnung and whose axis of rotation parallel to j

Meßgutoberfläche is, on. Each mounted on the impeller displacement body, preferably cuboid, generated at j

Immersion in the material under test a direct or indirect torque, the corresponding electronic measuring devices detect and convert it into a torque proportional alektricsignal. An A / D converter prepares this for the microcomputer. This takes over the evaluation of Einzelmeßwerte according to the known calculation formulas for the ι

Viscosity and yield point.

-2- 284 350 I

Exemplary embodiments j

The invention will be explained in more detail with reference to drawings. Show it

Figure 1: Schematic representation of the Meßvorrichtunp on the principle of direct torque measurement

Figure 2: Schematic representation of the measuring device according to the principle of indirect torque measurement!

(Measurement of the current consumption of the drive element) {

Figure 3: Representation of a paddle wheel {

FIG. 4: unrolled mantle surface of a paddle wheel {

Example 1 :

According to FIG. 1, the synchronous torque motor 1 is connected to the torsion measuring device 2 and this to the paddle wheel 3. ;

The measuring device can be extended around the paddle wheel 4, which is arranged downstream of the paddle wheel 3. Paddle wheel 3 is,. ι

according to Figure 3 with the cuboids 5 to 9 and paddle wheel 4 equipped with the cuboids 10 to 14. All cuboids are symmetrical j

mutually offset and different in their displacement. The functional elements 1 to 4 are mounted together on the plate. The measuring device further consists of the A / D converters 15,21, the temperature measuring device 20 and the microcomputer 16. The synchronous geared motor 1 drives at a constant speed about 0.1 see " ¹ , on the i

Torsionsmeßeinrichtung 2 located on a common axis of rotation paddle wheels 3 and 4 at. Each of the ten cuboids 5 to 14 generated when immersed in the Meßgut 19 a torque that detects the Torsionsmeßeinrichtung 2 and converts it into the torque-proportional voltage signals a ₆ to a ₁₄ . Oer A / D converter 15 prepares this for the microcomputer 16!

on. This calculates the viscosity c and the yield value d, whose value is displayed by known peripheral devices and / or!

be registered.

Example 2

According to FIG. 2, the synchronous geared motor 1 is connected directly to the paddle wheel 3 and the paddle wheel 4. All three

Device elements are arranged on a common axis of rotation and mounted on the plate 20. The paddle wheels 3,4 j

are also with the ten cuboids 5 bi <? 9 or 10 to 14 corresponding to Figure 3, equipped. The size and arrangement of the cuboid is analogous to the embodiment 1.De measuring device consists of the current meter 17,1 / U converter 18, A / D converter 15 and 21, temperature measuring device 20 and microcomputer 16.

The synchronous geared motor ¹ directly drives the paddlewheel 3 and 4 at a constant speed of about 0.1 sec.sup.1 Each of the ten parallelepipeds 5 to 14 causes a different current consumption of the drive element 1 when immersed in the test object 19 due to the different displacement surfaces compared to idling on ") b. The current meter 17 determines the current value b ₆ to b ₄ belonging to each cuboid. These torque-proportional St.omsignals b ₅ to bu converts the I / U converter 18 into the torque-proportional voltages b _{s to} b | ₄ um. the further processed as in the embodiment 1, the signals c and d displayed and / or registered.

The transducer according to the invention makes it possible, in conjunction with the other device elements, to measure the rheological properties viscosity and yield value of non-Newtonian media according to the principle of multipoint measurement with high accuracy. Such a theological measuring device is suitable for process and laboratory measurement. With it, small and coarse ^Hic persive measured goods can be measured. The short measurement times allow the detection of short term viscosity and yield point changes of non-Newtonian fluids. A equipped with this transducer measuring device can be used for use for formulation optimization in the chocolate mass sourcing industry.

The measurability of the viscosity and the flow rate is an essential prerequisite for the development of a fully automated chocolate mass production plant. Both theological parameters are decisive parameters in the automated manufacturing process. Saving high-quality impoft raw materials (such as cocoa beans and cocoa butter), reducing wear on processing machines, saving energy and increasing production would be the positive economic balance.

Claims (1)

Transducer for continuous measurement of theological values of non-Newtonian
Liquids with a microcomputer-based electronic evaluation unit, wherein a
constant-speed motor either indirectly or indirectly via a torsion measuring device with a rotatable
Measuring system whose axis of rotation is parallel to Meßgutoberfläche coupled, thereby
characterized in that the rotatable measuring system is designed as a Schaufelradanordnung (3,4), the
consists of one or more paddle wheels, and that each paddle wheel with at least two
not flexible, the Meßgut displacing body equipped different displacement surface
is, wherein the number of displacement body depends on the type of the measured material and this
symmetrically offset and arranged one below the other. For this 3 pages drawings