SU1381378A1 - Device for measuring moisture content in flows of loose materials - Google Patents

Abstract

The invention relates to the field of measurement technology and m. used in mining and processing enterprises. The purpose of the invention is to improve the measurement accuracy. The device contains a conveyor 1, through which a monitored material (KM) passes through a discrete stream, a humidity sensor 3, a segment of a coaxial line 4, autogenerators 5 and 6, a mixer 7, 8, a low-pass filter 9, a frequency converter 10 for example living, registering. Pribor 13, measuring transducer 15. The key 11 is entered into the device, ADC 12, a level sensor, made in the form of a source - emissions 14. y-R ay element 16, a signal conditioner (FS) 17, a shift register (PC) 18, , r-clock clock pulses 19. With the passage of KM 2 with a thickness exceeding the minimum, the impulse signal arrives from FS-17 on FS 17, the duration of which is equal to the time of passage of KM 2 in the field of the 7-radiation source 14. Signal of the required shape enters the input of PC 18, which acts as a delay element. From the output of PC 18, through the key AND, the information about the p-value is fed to the A / D converter 12, converted into a digital code, stored until the arrival of humidity information, the trace, portions of the CM and enters the recording device 13. 1 Il. cl

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The invention relates to a measurement technique and can be used in ore-dressing plants, as well as in other fields to control the moisture content of bulk materials in streams.

The aim of the invention is to improve the measurement accuracy.

The drawing shows a block diagram of a device for measuring humidity in streams of raw materials.

A device for measuring humidity in bulk material flows contains a conveyor 1 on which a monitored material 2 is arranged with a discrete flow, a humidity sensor 3 that is connected via the coaxial line 4 to the input of the first auto-generator 5, the output of the first aBTOretiepa-pa 5 and the output of the second auto-generator 6 are connected to the first and the second inputs of the mixer 7, respectively, the output of the mixer 7 through the amplifier 8 and the filter 9 are low ;; Frequency is connected to the input of frequency converter 10 to voltage, the output of which is connected via key 11 and analog-digital converter 2 to the input of recording device 13. At a distance from sensor 3 above the flow of monitored material 2 a level sensor is installed. -radiation source 14, the radiation of which through the flow of the material being monitored 2 is received by the primary measuring transducer (5, the output of which through the relay element 6 and the signal conditioner 17 are connected (I1 with the information register B.voaorvi 18 shift input is connected to sdvmga vgho- up: A 19 clock pulse generator, the output of register 18 is connected to the control s.aviga Yu- HihM input key M.

A device for measuring humidity in bulk material flows works as follows. UN1.I.M.

La 3 moisture 3 slides Pio in controllable material 2. 2. reactive inductance, and consequently, the electrical capacitance varies from the humidity of the controlled material 2 being in. high frequency field. Thus, a detuning is introduced into the circuit of the first autogenerator 5 and a signal with a frequency of 1 | is taken from its output. From the output of the second autogen-6, the signal of a constant frequency i-2 is removed. Both signals are fed to mixer 7, the output of which removes the signal of the difference frequency At. The value of At is the metered humidity of the monitored material 2. After this, in the amplifier 8, the signal of the frequency At usi, i is detected. further, the high-frequency interferences are filtered out; in the converter 10, 4ac: toTbi conversion occurs in the At-U parameter. Dalkey-Hiee. U signal can be extracted through the key II to the analog-to-digital converter 12 only if the control input of the key 11 will be served

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The second signal is from the output of the 18 shift register. This signal must be received at the time and for the time of passage of a separate portion of the material under test 2 of the required thickness under the electrodes of the humidity sensor 3. At a distance L from the humidity sensor 3 above the flow of the monitored material 2, a source of 14 y-radiation is installed. -y-quanta, passage of the monitored material 2, arrive at the primary measuring transducer 15. the signal from the output of which is fed to the -offlay element 16. -the relay element adjusts to the required thickness of the layer of the material being controlled 2. Thus, during the passage of the monitored material 2 a thickness greater than the minimum, from the y-relay element 16, the signal shaper 17 receives an impulse signal, the duration of which is equal to the transit time of the monitored material 2 in the source field 14. The required signal f The form enters the information input of the shift register 18, which functions as a delay element. The delay time is l1 L / V where L is the distance between the level sensor and humidity sensor 3; V is the speed of movement of the controlled material 2. The required value of the delay time At is due to the required number of bits in the 18 shift register and the frequency of the following so-called, TOE: i .-; x orl-guls, nocryiiaKJiHHX from the clock gey: rator nineteen.

Thus, from the output of the shift register 18 to the control input of the key 1 i, the enabling s signal to MO.iei-; T of the passage of the monitored material 2 in the humidity area of the humidity sensor 3 is received. The il key is opened, and the humidity information is fed to the analog-to-digital converter 12. The information is converted into a digital code, recorded before the humidity information of the next portion of the monitored material is received, and enters the recording device 13.

Claims (1)

Invention Formula A device for measuring humidity in bulk material flows, comprising a series-connected humidity sensor, a first auto-oscillator, a mixer, an amplifier, a low-pass filter and a frequency to voltage converter, a second auto-oscillator, the output of which is connected to the second input of the blender, a recording device, characterized in that In order to improve the measurement accuracy, the level sensor connected in series, the relay element, the signal conditioner, the shift register, the key and the analog-digital converter, are introduced. as well as a clock generator, the output of which is connected to the shift input of the shift register, 313813784 the output of the analog-digital converter, the level sensor is made in the form of a source connected to the input of the recording radiation receiver and the primary measuring instrument, the second key input is connected to the high-voltage converter, the output of which is from the frequency converter to the current is output by the level sensor.