SU124165A1 - Device for monitoring the reflection coefficient of bulk substances, in particular flour - Google Patents

Description

Existing instruments and devices for measuring the reflection coefficient of bulk substances, in particular flour, are intended for laboratory measurements and are not suitable for automatic continuous monitoring of the technological process. Their main disadvantages are: the ability to carry out only periodic monitoring of individual portions of the product taken from the stream and compacted by hand; the need to configure the measuring circuit before each measurement.

The proposed device does not have these disadvantages and provides continuous sampling from a controlled flow of bulk material (flour), its compaction and exposure in front of the measuring photovoltaic unit; the availability of a device for automatically adjusting the measuring circuit to the reference sample increases the measurement accuracy and eliminates the need for manual adjustment. In addition, the proposed device has a device for recording measurement results, as well as a device for generating command pulses that can be used for automatic adjustment; technological process.

FIG. 1 is a schematic diagram of the construction of the proposed device; in fig. 2 is a block diagram of a photovoltaic assembly and a secondary installation device.

The device consists of three main parts; sealing-exhibiting unit (PEM), photovoltaic unit (PMT) and secondary device (VP). The flow of particulate matter Q entering through the upper inlet of the casing / (Fig. 1) hits the grooved surface of the rotating roll 2. Part of the flow Qi is carried by the movement of the roll into the gradually narrowed wedge-shaped gap formed

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the grooved surface of the roll 2 and the smooth curve of the inner surface of deck 3. Another, large, part of the bulk material Q-Qi freely falls from the roll down and out of the casing through the bottom outlet. As it progresses in the wedge-shaped gap, the granular material undergoes gradual compaction and, in this compacted state, protrudes along the surface of the transparent eye 4 of the photoelectric assembly. Side cheeks 5 are provided to prevent spillage when pulling loose material. Deca 3 is connected to the body / by means of hinge 6. Cleaning the grooved surface of the roll from the compacted layer of loose material coming out from under deck 3 is done with a brush 7. The flow of bulk material Qi cleaned off the surface of the roll is combined with the flow Q-QI and removed from the device body through the lower outlet. The continuous cleaning of the inner surface of the peephole 4 is carried out by a layer of compacted bulk material moving on it itself, as a result of which sticking and sticking of the product on the peephole surface are excluded.

The basis for measuring the reflection coefficient of a friable substance in a device is a method of comparing the luminous flux reflected from the surface of the measured product with the luminous flux reflected from the surface of the reference sample. Luminous flux from a common source / (Fig. 2) falls on the reference surface 2 and on the surface 3 formed by the test product in the eye. The light fluxes reflected from these surfaces by means of photocells 4 and 5 are converted into electric currents, which are compared with each other in size and sign in a bridge circuit composed of photocells and constant resistances (s and 7. The potential difference appearing in the circuit as a result of the difference in the reflection coefficients of surfaces 2 and 3, is increased by amplifiers 8 (direct current) and 9 (alternating current). At the output of amplifier 9, there is a reversing motor Yu, which, under the influence of an enhanced potential difference starting it rotates, and the direction of rotation depends on the sign of the signal being amplified. towards alignment of the light fluxes. As soon as this alignment occurs, the potential difference in the bridge circuit disappears and the engine} 0 stops. An arrow Ci is mounted on the axis of the engine, which moves along the digitized bars. The angle of rotation of the arrow determines the reflection coefficient (whiteness) of the product. Engine 10 is also associated with a recording device Cj, which marks on the chart paper the reflectivity values of the product. A three-position control device is also associated with this engine. This device is made in the form of three disks with cavities and three contact groups. By changing the position of the valleys in relation to the zero point and in relation to each other, three-position adjustment can be made.

To eliminate errors caused by changes in the parameters of the entire device due to various uncontrolled causes (aging of photocells, illuminator lamps and amplifying lamps, changing the ambient temperature, fluctuations in voltage and frequency of the supply network, etc.), the device provides for automatic periodic adjustment of measurement parameters scheme. In order to make an automatic adjustment in the mechanism for moving the chart paper 14 on one axis, a cam is set on the axis making one revolution per hour. On the plate, carrying all the details of the paper movement mechanism, a contact group of two normally open and one normally closed contacts is strengthened on a special bracket. The cam as it approaches the contacts pushes them. In this case, the normally closed contacts J5, through which the selsins are connected, are opened and the optical wedge 13 under the action of the spring 16 becomes in the extreme position. The contact 17 is closed and thereby energizes the electromagnet 18, which, in place of the surface 3, brings the reference surface 19; the contacts 20 are closed and energize the electromagnetic coupling 21, as a result of which the axis of the engine 10 engages the slider 22 of the variable resistance amplifier 8. If the circuit parameters have not changed, then the input of amplifier 9 will not receive a signal and the engine 10 will be stationary. If, due to any reasons, the graduation of the device is broken, the engine 10 will come into rotation and will move the slider 22 until the circuit parameters are restored. Upon the release of the cam from the engagement with the contact group, the normal operation of the device is restored. The power of the photovoltaic unit and the amplifier 8 is produced from a stabilized source of the power supply unit 23.

Subject invention

1. A device for monitoring the reflection coefficient of solids, in particular flour, containing a photoelectric node comparing the light rays reflected from the measured substance and the standard, and equipped with a secondary recording and regulating device, characterized in that in order to automatically control and receive command pulses to control the reflection coefficient of a substance into a stream by changing the mode of the technological process, it uses a sealing and exposing unit containing a roll with a corrugated surface The surface and the hinged deck with a curved inner surface form a wedge-shaped gap between them in which the substance is compacted and continuously exposed through the deck's transparent eye in front of the photocell. 2 .. The apparatus according to claim 1, characterized in that, in order to preserve the stability of the measurement conditions by automatically periodically checking and adjusting the photovoltaic assembly, it is equipped with a device for periodically exposing the reference sample in front of the photocell.

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