SU1741108A1 - Apparatus for regulation humidity of free-flowing material - Google Patents

Abstract

The invention relates to systems for controlling non-electric quantities and can be used in devices for automatically controlling the moisture content of bulk materials in a stream. The purpose of the invention is to increase the accuracy of the device for controlling the moisture content of the bulk material. The device contains a bunker 1, a conveyor 2 supplying the mixture to the bunker, a distribution conveyor 4 with a mixture 5, a pipeline with a valve 6 supplying water to the bunker, main 19 and additional 7 electrodes installed respectively in the main 20 and additional 8 insulating bushes, volume sensor 11 bulk material on a falling conveyor with a lever 9 connected to one of the sleeves 8, the first 25 and second 18 indicators, connected through amplifiers 24 and 16, respectively, with the main 19 and additional 7 electrodes. 1 hp f-ly, 5 ill. (L S 19 O 00

Description

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The invention relates to non-electric quantity control systems and can be used in devices for automatic moisture control of bulk materials in a stream.

A device for automatic moisture meters is known, which contains a measurement circuit, a capacitive sensor with forced compaction of a material.

The disadvantage of this device is low accuracy, since the readings of the moisture meters strongly depend on the degree of compaction of the material under study.

Closest to the present invention is a device for automatic control of the moisture content of bulk materials in a stream, containing a mixing bunker, a conveyor for feeding the mixture to a mixing bunker, a distribution conveyor, electrodes on an insulating sleeve, located above the distribution conveyor, measuring, amplifying, performing and indicator device, valve valve.

A disadvantage of the known device is the low accuracy of the moisture control of the material. This is due to the fact that the electrodes and the measuring device are installed above the distribution conveyor after the mixing hopper. When this happens the following. When the mixture approaches the measuring electrodes, for example, the mixture is dry, a signal is sent to the actuator to open the valve valve. The latter is opened and water flows into the mixing bin. However, due to the considerable distance from the water inlet to the measuring electrode, there is a delay in closing the valve valve, resulting in water overflow. And placing the measuring electrodes closer to the water is not possible, since the blades rotate in the mixing bin.

In addition, the valve is opened regardless of the volume of material passing through.

The aim of the invention is to improve the accuracy of the device

The goal is achieved by the fact that the device automatically controls the moisture content of bulk materials in the flow, contains a bunker located between the supply and distribution conveyors of the bulk material, a pipeline with a water supply valve to the bunker connected to the actuator, the main electrodes located in the main insulating bushings Above the distribution conveyor and connected via an amplifier to the first moisture indicator is equipped with a bulk volume sensor on the supply conveyor. Additional electrodes located in additional insulating sleeves above the feed conveyor, a second indicator connected via a summing amplifier with additional electrodes, the bulk volume sensor and additional electrodes being connected through a summing amplifier to the actuator.

In addition, the bulk volume sensor is made in the form of a rotation angle sensor mounted on the axis of rotation of the lever, the end of which is connected to one of the additional insulating bushings.

Figure 1 shows the proposed device, a general view, and a functional diagram; FIG. 2 shows the measuring device installed under the conveyor of feeding the mixture into the mixing bunker, general view, on the flash. 3 - the same, top view; FIG. 4 shows the measuring device mounted above the distribution conveyor after the mixing bunker, top view; Fig. 5 is a graph of the position of the valve valve as a function of the thickness of the material layer on the conveyor.

A device for automatic moisture control of bulk materials in the stream contains mixing bin 1, conveyor 2 supplying mixture 3 to mixing bin 1, distribution conveyor 4 with mixture 5, valve valve 6 A measuring device containing additional electrodes 7, additional insulating sleeves 8 are installed above conveyor 2 , lever 9, bracket 10, mass volume sensor 11 In a preferred embodiment of the device, it is further provided that the volume sensor 11 consists of an angle sensor, for example , induction, mounted on the axis of rotation of one of the ends of the lever, on the other end of which is fixed insulating sleeve 8 with electrodes 7. The lever 9 is mounted on axis 12 in bracket 10 On axis 12 there is installed rotor 13, angle sensor stator 14, which forms sensor 11 volume. The stator 14 is mounted on the bracket 10 through the flange 15. The signal from the volume sensor 11 and the electrodes 7 is fed to the summing amplifier 16, then to the actuator 17, which is connected to the valve 6, and as a feedback signal to the amplifier 16. With a mustache; The signal 16 also arrives at indicator 18 in the 18th. Above the distributor. conveyor 4 installed measuring

a device containing the main electrodes 19, the main insulating bushes 20, the lever 21, the bracket 22. The lever 21 is mounted on the axis 23 into the bracket 22. The signal from the electrodes 19 goes to the amplifier 24 and then to the first indicator 25.

The device works as follows.

For moving mass 3 on conveyor 2, resistance is measured by electrodes 7 and deflection angle of lever 9 is measured by volume sensor 11, which is proportional to the volume of passing mass 3. Both of these signals go to amplifier 16, then to actuator 17, which associated with the valve valve 6. Depending on the magnitude of the signals, the valve 6 opens or closes, thereby regulating the water supply to the mixing bin 1. At the same time, the amount of water enters simultaneously with the amount of mass 3 and its humidity. The feedback from the actuator 17 to the amplifier 16 does not allow operation in relay mode, i.e. valve valve 6 is fully open or fully closed. Thus, the proposed device seems to predict the required amount of water at each moment of the mass entering the mixing bin 3. The mixed mass flows to the distribution conveyor 4, over which electrodes 19 are installed, the signal from which goes to the amplifier 24 and on the indicator device 25, calibrated as a percentage of moisture. This is necessary to configure the sensors installed in front of the mixing bin 1 and to obtain the necessary information at any current time. Actual measurements provide a plot of control valve 6

(p, hail) on the thickness of the layer of mass 3 (h cm) at different moisture mass.

Thus, the information obtained about the state of mass 3 and its volume to

mixing bunker 1, allows to increase the accuracy of regulation, since the amount of water and the time of its entry into the bunker are coordinated with the arrival time of that part of the mass 3 for which it is intended.

Claims (2)

1. A device for regulating the moisture content of the bulk material containing a hopper located between the feed and bulk material distribution conveyors, a pipeline with a water supply valve to the bunker connected to the actuator, main electrodes located in the main Insulating sleeves above the distribution conveyor and connected through an amplifier to the first moisture indicator, characterized in that, in order to improve the accuracy of the device, it is equipped with a bulk volume sensor on the feed conveyor, additional electrodes located in additional isolation sleeves above the feeding conveyor, the second an indicator connected through a summing amplifier with additional electrodes, the bulk volume sensor and the additional electrodes being connected through s sum amplifier with executive mechanism. 2. The device according to claim 1, characterized in that the bulk volume sensor is made in the form of a rotation angle sensor of a lever mounted on an axis of rotation, the end of which is connected to one of the additional insulating bushings ////// X /////// G. /. , . .... - - - -sf -.-.-. ..v. . -... .. / /. ::, .. “. #. . f Fie.2 FIG. four 10 20 30 4050 60 70 in 9O of FIG. five 20 & (R.grad