FI62733C - ANALYZING FOR PHYSICAL AND CHEMICAL ANALYSIS ANALYSIS OF GRANULAR ELLER POWDER FORMED AEMNE - Google Patents

Description

62733

This invention relates to an apparatus for the physical or physicochemical analysis of a granular or powdery substance, such as cement or its raw material, such as its darkness or fineness. In particular, this invention relates to a device having a chamber provided with one or more apertures covered by a film permeable to radiation emitted or emitted by a granular or powdery substance and which can be filled with a powdery or granular substance.

Numerous devices are already known for the physical or physicochemical analysis of a granular or powdery substance, either directly in the production stream or in its immediate vicinity. Generally, the granular or powdery substance to be analyzed is placed in a measuring cuvette equipped with a radiation-transmitting membrane for measurement. Devices for measuring directly from the production stream are also known. Such devices are arranged above an endless conveyor or a large-diameter cylinder to which the product flow is directed to measure its physical or physicochemical properties. To analyze sludges, there are also flow-through cuvettes equipped with a transparent window.

However, there are various drawbacks to these previously known devices which the present invention is intended to eliminate. Thus, for example, analysis performed with a measuring cuvette is difficult to automate and therefore requires a lot of labor.

t 2 62733 A flow-through cuvette, on the other hand, is not suitable as such for a powdery or granular substance, as it is difficult to achieve a uniform flow without separation phenomena in which fine or coarse granules drift to a greater extent into the measuring device. Performing a measurement on a moving conveyor or on a granular or powdery material on top of a cylinder is unreliable because it is difficult to obtain a smooth and representative surface of the powdery or granular material. The surface of the substance on the moving substrate is always slightly uneven and thus gives an unreliable measurement result.

It is therefore an object of the present invention to provide an apparatus for the physical or physicochemical analysis of a granular or powdered substance in or in the immediate vicinity of a production stream which is simple to manufacture, easy to use and gives a very reliable measurement result.

The main features of the invention appear from the appended claim 1.

The device according to the present invention makes it possible to determine the physical or physicochemical properties of a granular or powdery substance accurately and reliably when the powder is completely immobile and tightly against the measuring window at the time of measurement. Immobility ensures that no separation of fine and coarse granules occurs, but that the mixture remains homogeneous and representative. It is easy to form a surface of reproducible geometry in the device by means of a radiation-transmitting membrane and by fitting a vibrating member to ensure that the powder or granular material is tightly sealed against the measuring window and that the measuring chamber is completely emptied after measuring.

In the case of small product flows, the measuring device can be fitted directly to the product flow channel, whereby the flow is preferably cut off during the measurement.

The invention will be described in more detail below with reference to the accompanying drawing, in which Figure 1 shows a cross-sectional side view of a preferred embodiment of the invention, and Figure 2 shows the same device from the front.

In the device shown in the drawing, the measuring chamber is denoted by reference numeral 1 and is provided at its top with a filling opening 2 connected to the measuring chamber 1 by a truncated cone-shaped part 9. The lower chamber of the measuring chamber 1 has a drain opening 3 provided with a 8. A plurality of openings are formed in the measuring tray 1, which is covered with a radiation-transmitting film 4, which may be plastic, glass or another radiation-transmitting substance used for the measurement.

A vibrating member 10 is further attached to the lower truncated cone 8 to ensure that the powdered or granular substance to be analyzed is tightly compacted against the membrane 4 and that the analyzed powdered or granular substance exits the measuring chamber 1 as accurately as possible after opening the valve 5. The valve 5 may be of the type of diaphragm valve shown in Fig. 1, in which the flexible diaphragm 7 is adapted to throttle the discharge opening 3 and close it completely when pressure medium is fed from the opening 6 between the flexible diaphragm 7 and the valve 5 housing.

4,62733

In the device according to the present invention, the measuring chamber 1 is thus filled from above through the filling opening 2 with the valve 5 of the discharge opening 3 closed until the opening covered by the membrane 4 on the side of the chamber 1 is completely covered by the substance, whereby the measurement can be carried out without moving the powder or granular material during the measurement in chamber 1.

In order to ensure that no air pockets are left between the film 4 and the powdery or granular substance, the powdery or granular substance is vibrated by the vibrating member 10 before the measurement. Finally, the valve 5 is opened to empty the chamber 1, and in order to perform the emptying as accurately as possible, the vibrating member 10 can be used at the same time. The filling opening 2 is preferably connected to a separate sampling device by means of which a sufficient amount of sample is taken from the product stream to fill the chamber 1 and the emptying opening 3 is preferably connected to the product stream to return the analyzed sample to this product stream. If the product flow is relatively small, the measuring device can be fitted directly to the product flow channel, whereby its flow is preferably cut off during the measurement.

The filling opening 2 can also be provided with a valve which is opened after the measuring chamber 1 has been emptied and the valve 5 in the emptying opening 3 has closed. The powdered or granular material can be cement or a raw material for cement, from which, for example, its darkness is measured with a photometer or the degree of fineness with a fineness analyzer. An X-ray fluorescence analyzer can also be used to analyze the cement raw material.

Claims (6)

62733 Apparatus for the physical or physico-chemical analysis of cement or its raw material, comprising a chamber (1) with an opening covered with at least one radiation-transmitting film (4) reflected or emitted by the cement or its raw material, which can be filled with cement or its raw material , characterized by an opening (2) in the upper part of the chamber (1) for filling the chamber (1) for analysis and an opening (3) in the lower part for emptying the chamber (1) after analysis, the drain opening (3) having a shut-off valve (5) to keep the opening (3) closed during the filling of the chamber (1) and the analysis of the cement or its raw material, the diameter of the chamber (1) being larger than the diameter of the filling opening (2) and the emptying opening (3) and the chamber (1) joining the filling opening (2) with a truncated cone (9) and the discharge opening (3) likewise with a truncated cone-shaped portion (8), the truncated cone-shaped portions (8, 9) having a cone angle of about 20 to 40 °. Device according to claim 1, characterized by a vibrating member (10) for tightly sealing the cement to be analyzed or its raw material filling the chamber (1) against said film (4) and optionally removing it from the chamber (1) after analysis with the drain (3) valve (5) open. Device according to Claim 1 or 2, characterized in that it is arranged in the side stream of the product stream. Device according to Claim 1 or 2, characterized in that it is arranged directly in the product stream. Device according to one of the preceding claims, 6 62733, characterized in that the filling opening (2) is also provided with a shut-off valve. Device according to one of the preceding claims, characterized by an X-ray fluorescence analyzer placed against the membrane (4).