1. Flotation tail coal ash content on-line measuring device based on photoelectric effect, its characterized in that: including test probe casing (1) and signal processing case (2), the fixed photoelectric sensor (11) and light source (12) that are provided with of central point in test probe casing (1), light source (12) set up in photoelectric sensor (11) top, the inside bottom mounting of test probe casing (1) is provided with wear-resisting quartz glass diaphragm (13), test probe casing (1) top is provided with binding post (14), be provided with control circuit board in signal processing case (2), be provided with the display screen on the box of signal processing case (2), photoelectric sensor (11) loop through binding post (14), control circuit board and display screen electricity and are connected.

2. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the test probe shell (1) is fixed on the overflowing component (4) of the flotation tailings through the support piece (3).

3. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the flow-through member (4) comprises a vessel and a pipe.

4. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the control circuit board comprises a photoelectric conversion circuit (21), a filter circuit (22), an I-V conversion circuit (23), an A/D conversion circuit (24), a single chip microcomputer U1, a display circuit (25) and a power supply circuit (26), the wiring terminal (14) is connected with the input end of the photoelectric conversion circuit (21), the output end of the photoelectric conversion circuit (21) is connected with the input end of the single chip microcomputer U1 sequentially through the filter circuit (22), the I-V conversion circuit (23) and the A/D conversion circuit (24), the output end of the single chip microcomputer U1 is connected with a display screen through the display circuit (25), and the power supply circuit (26) supplies power for the single chip microcomputer and peripheral circuits.

5. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the photoelectric conversion circuit (21) comprises a photoelectric sensor M1 and an amplifier P1, the reverse input end of the amplifier P1 is connected with the photoelectric sensor M1 in series and then grounded, the reverse input end of the amplifier P1 is connected with a resistor R2 in series and then connected with the output end of an amplifier P1, a capacitor C2 is connected with two ends of a resistor R2 in parallel, the homodromous input end of an amplifier P1 is connected with the resistor R1 in series and then grounded, a capacitor C1 is connected with two ends of the resistor R1 in parallel, and the output end of the amplifier P1 is connected with the input end of a filter circuit (22) in series and then connected with a capacitor C3.

6. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the filter circuit (22) comprises an amplifier P2 and an amplifier P3, wherein the non-inverting input end of the amplifier P2 is connected with the output end of the photoelectric conversion circuit after being connected with a resistor R5 and a resistor R3 in series in sequence, a connecting line between the resistor R5 and the resistor R3 is connected with the output end of the photoelectric conversion circuit in series and then grounded, a series circuit formed by the capacitor C3 and the capacitor C3 is connected with both ends of the series circuit formed by the resistor R3 and the resistor R3 in parallel, a connecting line between the capacitor C3 and the capacitor C3 is connected with the non-inverting input end of the amplifier P3 in series and then connected with the non-inverting input end of the amplifier P3, a connecting line between the inverting input end of the capacitor C3 and the resistor R3 is connected with the output end of the amplifier P3 in series, the connecting line between the inverting input end of the amplifier P3 and the non-inverting input end of the amplifier P3 is connected with the connecting line of the amplifier P3 in series and then connected with the output end of the amplifier P3 in series, the connecting line between the inverting input end of the amplifier P3 and then connected with the amplifier P3, the inverting input end of the amplifier P3 is connected with the output end of the amplifier P3 and the connection terminal a after being connected with the resistor R9 in series, and the capacitor C6 is connected with the two ends of the resistor R9 in parallel.

7. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the I-V conversion circuit (23) comprises an amplifier A1, and the model of the amplifier A1 is AD549 JH; the output end of the filter circuit (22) is connected with a connection terminal b, the connection terminal b is respectively connected with one end of a capacitor C7, one end of a resistor R10 and the inverting input end of an amplifier A1, the other end of the capacitor C7 is respectively connected with one end of a resistor R11, one end of a resistor R12 and the output end of an amplifier A1, the other end of a resistor R11 is connected with the other end of a resistor R10, the other end of a resistor R12 is respectively connected with one end of a capacitor C10 and the input end of an A/D conversion circuit (24), the other end of a capacitor C10 is connected with the negative power supply end of the amplifier A1 after being connected with the capacitor C9 in series, a connection line between the capacitor C10 and the capacitor C9 is connected with the non-inverting input end of the amplifier A1, the positive power supply end of the amplifier A1 is connected with a 5V power supply end, and a connection line between the positive power supply end of the amplifier A1 and the 5V power supply end is connected with the capacitor C8 in series and then grounded.

8. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the A/D conversion circuit (24) comprises an A/D conversion chip U2, the model of the A/D conversion chip U2 is ADC0804, and the model of the singlechip U1 is AT89C 51; the WR end of the A/D conversion chip U2 is connected with the P3.4 end of the singlechip U1, the RD end of the A/D conversion chip U2 is connected with the P3.3 end of the singlechip U1, the CS end of the A/D conversion chip U2 is connected with the P3.2 end of the singlechip U1, the CLKIN end of the A/D conversion chip U2 is connected with a capacitor C11 IN series and is respectively connected with the IN-end of the A/D conversion chip U2, the AGND end of the A/D conversion chip U2 and the DGND end of the A/D conversion chip U2 and then is grounded, a connecting line between the DGND end of the A/D conversion chip U2 and the grounding end is sequentially connected with a resistor R15 IN series, a resistor R14 and then is connected with a 5V power supply end, a connecting line between the resistor R15 and the resistor R14 is connected with the REF end of the A/D conversion chip U2, the IN + end of the A/D conversion chip U2 is connected with the output end of the I-V conversion circuit, and the DB 467 end of the singlechip U467, the DB6 end of the A/D conversion chip U2 is connected with the P1.6 end of the single chip microcomputer U1, the DB5 end of the A/D conversion chip U2 is connected with the P1.5 end of the single chip microcomputer U1, the DB4 end of the A/D conversion chip U2 is connected with the P1.4 end of the single chip microcomputer U1, the DB3 end of the A/D conversion chip U2 is connected with the P1.3 end of the single chip microcomputer U1, the DB2 end of the A/D conversion chip U2 is connected with the P1.2 end of the single chip microcomputer U1, the DB1 end of the A/D conversion chip U2 is connected with the P1.1 end of the single chip microcomputer U1, the DB0 end of the A/D conversion chip U2 is connected with the P1.0 end of the single chip microcomputer U1, and the INTR end of the A/D conversion chip U2 is connected with the P3.5 end of the single chip microcomputer U1.

9. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the power supply circuit (26) comprises a transformer U3, a diode D2, a diode D3, a diode D4, a diode D5, a voltage stabilizer IC1, a voltage stabilizer IC2 and a voltage stabilizer IC3, wherein the types of the voltage stabilizer IC1 are LM317, the types of the voltage stabilizer IC2 are LM7809, and the types of the voltage stabilizer IC3 are LM 7805; the 220V power supply is reduced in voltage through a transformer U1 in sequence, rectified by a bridge circuit consisting of diodes D2-D5, filtered by a capacitor C15 and then connected with a Vin end of a voltage stabilizer IC1, a GND end of the voltage stabilizer IC1 is grounded, a Vout end of a voltage stabilizer IC1 is respectively connected with a +12V power supply end, one end of an electrolytic capacitor C16, one end of a capacitor C17, a Vin end of a voltage stabilizer IC2, one end of an electrolytic capacitor C19, one end of a capacitor C20 and a Vin end of a voltage stabilizer IC3, the other end of an electrolytic capacitor C16 is respectively connected with the other end of a capacitor C17, the GND end of a voltage stabilizer IC2, one end of a capacitor C18, the other end of an electrolytic capacitor C18, the other end of a capacitor C20, the GND end of a voltage stabilizer IC3 and one end of a capacitor C21 and then grounded, the other end of a capacitor C18 is respectively connected with a Vout and a +9V power supply end of an IC 874.

10. The flotation tail coal ash online detection device based on the photoelectric effect is characterized in that: the test probe shell (1) is a hollow tube made of glass fiber reinforced polyester material.

Background

Flotation is a method widely applied to sorting fine coal slime, flotation tailing ash is an important index for judging the effect of the flotation process, and operators judge the loss condition of clean coal in the flotation tailing and the flotation tailing ash by observing the color of the flotation tailing ash so as to adjust the flotation process. In the flotation automatic control process, the ash content of the flotation tail coal is used as an important control target and feedback information, and is an important decision basis for closed-loop intelligent control of the flotation process, and at present, no on-line detection method and instrument equipment capable of timely and accurately detecting the ash content of the flotation tail coal exist, and the method becomes a bottleneck for restricting the development of the intelligent control technology of the flotation process.

The invention provides an ore pulp ash online detection device and a detection method, the method disclosed by the patent comprises the steps of shunting, sampling and filtering flotation tailings, and then detecting the ash content of a sample by adopting an X-ray detection assembly for a filter cake, the method is an offline sampling detection method, the flow is complex, a certain time period for sample collection, treatment and detection is required, the ash content information of flotation tail coal cannot be reflected immediately, certain hysteresis is realized, the adopted X-ray detection assembly device is complex in structure, the manufacturing cost is high, and the radiation safety hidden danger is caused if the shielding is improper. The invention patent CN201811038931.5 provides a method for detecting ash content, concentration and coarse particle content of flotation tailing based on images, the method disclosed by the patent is also an off-line sampling detection method, and the ash content of the flotation tailing is obtained through split-flow sampling, sample container cleaning and sample introduction, then a camera is used for collecting images, and image gray level analysis and a mathematical model; the method has the defects of insufficient sampling representativeness, low identification accuracy of the flotation tailing gray level, complex calculation process and the like. The methods and devices disclosed in the above two patents are off-line sampling detection methods, and have certain time period lag, complex device system, low precision, and potential safety hazard problems such as ray radiation. Therefore, a method and a device for timely and accurate online detection of the ash content of the flotation tailing coal are urgently needed to be developed, and the demand of the flotation intelligent control process on real-time, accurate and online detection of the ash content of the flotation tailing coal is met.

Disclosure of Invention

The invention overcomes the defects of the prior art, and solves the technical problems that: the utility model provides a flotation tailing ash content on-line measuring device based on photoelectric effect can carry out science, in good time, accurate on-line measuring to the ore pulp ash content in flotation tailing ore pulp stream.

In order to solve the technical problems, the invention adopts the technical scheme that: flotation tail coal ash content on-line measuring device based on photoelectric effect, including test probe casing and signal processing case, the fixed photoelectric sensor and the light source that is provided with in central point in the test probe casing, the light source sets up in the photoelectric sensor top, the fixed wear-resisting quartz glass diaphragm that is provided with in the inside bottom of test probe casing, test probe casing top is provided with binding post, the in-box control circuit board that is provided with of signal processing, be provided with the display screen on the box of signal processing case, photoelectric sensor loops through binding post, control circuit board and is connected with the display screen electricity.

The test probe shell is fixed on the flow passing member of the flotation tailings through the support.

Further, the flow passage member includes a container and a pipe.

Furthermore, the control circuit board comprises a photoelectric conversion circuit, a filter circuit, an I-V conversion circuit, an A/D conversion circuit, a single chip microcomputer U1, a display circuit and a power supply circuit, the wiring terminal is connected with the input end of the photoelectric conversion circuit, the output end of the photoelectric conversion circuit is connected with the input end of the single chip microcomputer U1 sequentially through the filter circuit, the I-V conversion circuit and the A/D conversion circuit, the output end of the single chip microcomputer U1 is connected with the display screen through the display circuit, and the power supply circuit supplies power to the single chip microcomputer and peripheral circuits.

Preferably, the photoelectric conversion circuit comprises a photoelectric sensor M1 and an amplifier P1, an inverting input terminal of the amplifier P1 is connected in series with the photoelectric sensor M1 and then grounded, an inverting input terminal of the amplifier P1 is connected in series with a resistor R2 and then connected with an output terminal of an amplifier P1, a capacitor C2 is connected in parallel with two ends of a resistor R2, a homodromous input terminal of the amplifier P1 is connected in series with the resistor R1 and then grounded, a capacitor C1 is connected in parallel with two ends of the resistor R1, and an output terminal of the amplifier P1 is connected in series with a capacitor C3 and then connected with an input terminal of the filter circuit.

Preferably, the filter circuit includes an amplifier P2 and an amplifier P3, a non-inverting input terminal of the amplifier P2 is connected in series with a resistor R5 and a resistor R3 in sequence and then connected to an output terminal of the photoelectric conversion circuit, a connection line between the resistor R5 and the resistor R3 is connected in series with a capacitor C3 and then grounded, a series circuit composed of the capacitor C3 and the capacitor C3 is connected in parallel with both ends of the series circuit composed of the resistor R3 and the resistor R3, a connection line between the capacitor C3 and the capacitor C3 is connected in series with the non-inverting input terminal of the amplifier P3 and then connected to an output terminal of the amplifier P3, an inverting input terminal of the amplifier P3 is connected in series with the resistor R3 and then connected to ground, a connection line between the inverting input terminal of the amplifier P3 and the resistor R3 is connected to an output terminal of the amplifier P3 and then connected to the non-inverting input terminal of the amplifier P3 and then connected to the connection line of the amplifier P3 and then connected to the non-inverting input terminal of the amplifier P3 and then connected to the amplifier P3, the inverting input end of the amplifier P3 is connected with the output end of the amplifier P3 and the connection terminal a after being connected with the resistor R9 in series, and the capacitor C6 is connected with the two ends of the resistor R9 in parallel.

Preferably, the I-V conversion circuit comprises an amplifier a1, the amplifier a1 being of the type AD549 JH; the output end of the filter circuit is connected with a connection terminal b, the connection terminal b is respectively connected with one end of a capacitor C7, one end of a resistor R10 and the inverting input end of an amplifier A1, the other end of the capacitor C7 is respectively connected with one end of a resistor R11, one end of a resistor R12 and the output end of an amplifier A1, the other end of the resistor R11 is connected with the other end of a resistor R10, the other end of a resistor R12 is respectively connected with one end of a capacitor C10 and the input end of an A/D conversion circuit, the other end of a capacitor C10 is connected with the negative power supply end of the amplifier A1 after being connected with the capacitor C9 in series, a connection line between the capacitor C10 and the capacitor C9 is connected with the non-inverting input end of the amplifier A1, the positive power supply end of the amplifier A1 is connected with a 5V power supply end, and a connection line between the positive power supply end of the amplifier A1 and the 5V power supply end is connected with the capacitor C8 in series and then grounded.

Preferably, the a/D conversion circuit comprises an a/D conversion chip U2, the model of the a/D conversion chip U2 is ADC0804, and the model of the single chip microcomputer U1 is AT89C 51; the WR end of the A/D conversion chip U2 is connected with the P3.4 end of the singlechip U1, the RD end of the A/D conversion chip U2 is connected with the P3.3 end of the singlechip U1, the CS end of the A/D conversion chip U2 is connected with the P3.2 end of the singlechip U1, the CLKIN end of the A/D conversion chip U2 is connected with a capacitor C11 IN series and is respectively connected with the IN-end of the A/D conversion chip U2, the AGND end of the A/D conversion chip U2 and the DGND end of the A/D conversion chip U2 and then is grounded, a connecting line between the DGND end of the A/D conversion chip U2 and the grounding end is sequentially connected with a resistor R15 IN series, a resistor R14 and then is connected with a 5V power supply end, a connecting line between the resistor R15 and the resistor R14 is connected with the REF end of the A/D conversion chip U2, the IN + end of the A/D conversion chip U2 is connected with the output end of the I-V conversion circuit, and the DB 467 end of the singlechip U467, the DB6 end of the A/D conversion chip U2 is connected with the P1.6 end of the single chip microcomputer U1, the DB5 end of the A/D conversion chip U2 is connected with the P1.5 end of the single chip microcomputer U1, the DB4 end of the A/D conversion chip U2 is connected with the P1.4 end of the single chip microcomputer U1, the DB3 end of the A/D conversion chip U2 is connected with the P1.3 end of the single chip microcomputer U1, the DB2 end of the A/D conversion chip U2 is connected with the P1.2 end of the single chip microcomputer U1, the DB1 end of the A/D conversion chip U2 is connected with the P1.1 end of the single chip microcomputer U1, the DB0 end of the A/D conversion chip U2 is connected with the P1.0 end of the single chip microcomputer U1, and the INTR end of the A/D conversion chip U2 is connected with the P3.5 end of the single chip microcomputer U1.

Preferably, the power supply circuit comprises a transformer U3, a diode D2, a diode D3, a diode D4, a diode D5, a voltage stabilizer IC1, a voltage stabilizer IC2 and a voltage stabilizer IC3, wherein the models of the voltage stabilizer ICs 1 and 2 are LM7812, the models of the voltage stabilizer ICs 2 and 3 are LM 7805; the 220V power supply is reduced in voltage through a transformer U1 in sequence, rectified by a bridge circuit consisting of diodes D2-D5, filtered by a capacitor C15 and then connected with a Vin end of a voltage stabilizer IC1, a GND end of the voltage stabilizer IC1 is grounded, a Vout end of a voltage stabilizer IC1 is respectively connected with a +12V power supply end, one end of an electrolytic capacitor C16, one end of a capacitor C17, a Vin end of a voltage stabilizer IC2, one end of an electrolytic capacitor C19, one end of a capacitor C20 and a Vin end of a voltage stabilizer IC3, the other end of an electrolytic capacitor C16 is respectively connected with the other end of a capacitor C17, the GND end of a voltage stabilizer IC2, one end of a capacitor C18, the other end of an electrolytic capacitor C18, the other end of a capacitor C20, the GND end of a voltage stabilizer IC3 and one end of a capacitor C21 and then grounded, the other end of a capacitor C18 is respectively connected with a Vout and a +9V power supply end of an IC2 and a power supply end of a voltage stabilizer 21.

Preferably, the test probe housing is a hollow tube of glass fibre reinforced polyester material.

Compared with the prior art, the invention has the following beneficial effects:

the invention relates to a flotation tail coal ash online detection device based on photoelectric effect, which comprises a test probe shell and a signal processing box, wherein a photoelectric sensor and a light source are fixedly arranged at the central position in the test probe shell, a wear-resistant quartz glass diaphragm is fixedly arranged at the bottom end in the test probe shell, and the photoelectric sensor is electrically connected with the signal processing box through a wiring terminal; when the device is used, the test probe shell 1 is immersed in flotation tailing pulp, after the device is electrified, light emitted by a light source penetrates through the wear-resistant quartz glass membrane to be in contact with flowing flotation tailing, part of visible light radiation is absorbed by the flotation tailing pulp, the other part of visible light radiation is reflected by the flotation tailing pulp and is received by the photoelectric sensor, the reflected light ratio depends on the gray level of the flotation tailing pulp, the deeper the gray level of the flotation tailing is, the smaller the reflected light ratio is, the shallower the gray level of the flotation tailing pulp is, and the higher the reflected light ratio is; the reflected light received by the photoelectric sensor is converted into the intensity or the size of a current signal by the photoelectric sensor through the signal processing box 2, the obtained digital signal and the ash content of the flotation tailing pulp are processed, and the ash content value is displayed through a display screen; the invention carries out scientific, timely and accurate online detection on the ash content of the ore pulp in the slurry flow of the flotation tailings, effectively solves the defects of poor real-time performance, high labor intensity, complex working procedures, large errors, high requirements on professional skills and responsibility of test personnel and the like of the conventional ash content detection method, also overcomes the problems of poor representativeness of shunt sampling detection, time period hysteresis, complex device system, low precision, ray radiation and other potential safety hazards of the prior patent method, timely and accurately carries out online detection on the ash content of the flotation tailings, provides timely and accurate digital information for flotation production adjustment and an intelligent control system, and provides important technical support for improving the technical level of coal slime flotation production in China and promoting the development of flotation intelligent technology.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings;

FIG. 1 is a schematic structural diagram of a flotation tail coal ash online detection device based on a photoelectric effect;

FIG. 2 is a schematic structural diagram of a control circuit board according to the present invention;

FIG. 3 is a schematic circuit diagram of a photoelectric conversion circuit and a filter circuit according to the present invention;

FIG. 4 is a schematic circuit diagram of the I-V conversion circuit, the A/D conversion circuit, the single-chip microcomputer U1 and the display circuit of the present invention;

FIG. 5 is a circuit schematic of the power supply circuit of the present invention;

in the figure: the testing device comprises a testing probe shell 1, a photoelectric sensor 11, a light source 12, a wear-resistant quartz glass membrane 13, a wiring terminal 14, a signal processing box 2, a photoelectric conversion circuit 21, a filter circuit 22, an I-V conversion circuit 23, an A/D conversion circuit 24, a display circuit 25, a power supply circuit 26, a support 3 and an overcurrent component 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the device for detecting ash content in flotation tail coal on line based on photoelectric effect comprises a test probe shell 1 and a signal processing box 2, wherein a photoelectric sensor 11 and a light source 12 are fixedly arranged at the central position in the test probe shell 1, the light source 12 is arranged above the photoelectric sensor 11, a wear-resistant quartz glass diaphragm 13 is fixedly arranged at the bottom end in the test probe shell 1, a wiring terminal 14 is arranged at the top of the test probe shell 1, a control circuit board is arranged in the signal processing box 2, a display screen is arranged on the box body of the signal processing box 2, and the photoelectric sensor 11 is electrically connected with the display screen through the wiring terminal 14 and the control circuit board in sequence; the photoelectric sensor 11 can be a photoelectric sensor such as a photodiode, a photomultiplier, a phototriode, a photoresistor, a photocell and the like;

the device for detecting the ash content of the flotation tailings on line based on the photoelectric effect further comprises a support member 3 and a flow passage member 4, the test probe shell 1 is fixed on the flow passage member 4 of the flotation tailings through the support member 3, and the flow passage member 4 comprises a container and a pipeline; the test probe shell 1 is a hollow tube made of glass fiber reinforced polyester material.

When the device works, the test probe shell 1 is immersed in flotation tailing pulp, the immersion depth is within the range of 10-50 cm below the pulp liquid level, the device can also be immersed in a pipeline or other overflow components in shapes and is immersed in the flotation tailing pulp according to actual working conditions, after the device is electrified, light emitted by the light source 12 penetrates through the wear-resistant quartz glass membrane 13 and is contacted with flowing flotation tailing, part of visible light radiation is absorbed by the flotation tailing pulp, the other part of visible light radiation is reflected by the flotation tailing pulp and is received by the photoelectric sensor 11, the reflected light ratio depends on the gray level of the flotation tailing pulp, the deeper the gray level of the flotation tailing is, the smaller the reflected light ratio is, the shallower the gray level of the flotation tailing pulp is, and the higher the reflected light ratio is; the reflected light received by the photoelectric sensor is converted into the intensity or the size of a current signal by the photoelectric sensor through the signal processing box 2, the obtained digital signal and the ash content of the flotation tailing pulp are processed, and the ash content value is displayed through a display screen.

The flotation tailing ash online detection device based on the photoelectric effect scientifically, timely and accurately detects the ash content of ore pulp in the flotation tailing slurry flow on line, effectively overcomes the defects of poor real-time performance, high labor intensity, complex working procedures, large errors, high requirements on professional skills and responsibility of an inspector and the like of the conventional ash detection method, also overcomes the problems of poor representativeness of flow-dividing sampling detection, time period hysteresis, complex device system, low precision, ray radiation and other potential safety hazards of the conventional method disclosed by the patent, timely and accurately detects the ash content of the flotation tailing on line, provides timely and accurate digital information for flotation production adjustment and an intelligent control system, and provides an important technical support for improving the technical level of coal slime flotation production in China and promoting the development of flotation intelligent technology.

As shown in fig. 2, the control circuit board includes a photoelectric conversion circuit 21, a filter circuit 22, an I-V conversion circuit 23, an a/D conversion circuit 24, a single chip microcomputer U1, a display circuit 25 and a power supply circuit 26, the connection terminal 14 is connected to an input terminal of the photoelectric conversion circuit 21, an output terminal of the photoelectric conversion circuit 21 is connected to an input terminal of the single chip microcomputer U1 sequentially through the filter circuit 22, the I-V conversion circuit 23 and the a/D conversion circuit 24, an output terminal of the single chip microcomputer U1 is connected to the display screen through the display circuit 25, and the power supply circuit 26 supplies power to the single chip microcomputer and peripheral circuits.

Specifically, after the device is powered on, light emitted by the light source 12 penetrates through the wear-resistant quartz glass membrane 13 and on the contact surface of flowing flotation tailings, part of visible light radiation is reflected by flotation tailings slurry and received by the photoelectric sensor 11, the reflected light received by the photoelectric sensor is transmitted to the photoelectric conversion circuit 21 through the wiring terminal 14, a light signal received by the photoelectric sensor is converted into an electric signal, high-frequency clutter and low-frequency fluctuation are filtered by the filter circuit 22, the signal is more stable, the signal is output to the I-V conversion circuit 23, the I-V conversion circuit 23 performs resistance-capacitance filtering on the output voltage of the filter circuit 22, therefore, the next-stage circuit can obtain pure input signals, the A/D conversion circuit 24 converts the analog signals into digital signals and then sends the digital signals to the single chip microcomputer U1 for processing, and ash content values received by the photoelectric sensor are displayed on the display screen.

As shown in fig. 3, the photoelectric conversion circuit 21 includes a photosensor M1 and an amplifier P1, and the filter circuit 22 includes an amplifier P2 and an amplifier P3; the reverse input end of the amplifier P1 is connected with the photoelectric sensor M1 in series and then grounded, the reverse input end of the amplifier P1 is connected with the resistor R2 in series and then connected with the output end of the amplifier P1, the capacitor C2 is connected with the two ends of the resistor R2 in parallel, the homodromous input end of the amplifier P1 is connected with the resistor R1 in series and then grounded, the capacitor C1 is connected with the two ends of the resistor R1 in parallel, and the output end of the amplifier P1 is connected with the input end of the filter circuit 22 in series and then connected with the capacitor C3; specifically, in order to reduce the influence of noise on the output of the photoelectric conversion circuit 21 as much as possible, in the present embodiment, the capacitor C2 is connected in parallel with the resistor R2, so that the noise bandwidth is reduced, and meanwhile, the capacitor C3 is connected in series with the output terminal, so that the noise in the circuit can be removed, and the stability of the current signal in the circuit can be improved.

The non-inverting input terminal of the amplifier P2 is connected in series with the resistor R5 and the resistor R3 in sequence and then connected with the output terminal of the photoelectric conversion circuit, a connecting line between the resistor R5 and the resistor R3 is connected in series with the capacitor C5 and then grounded, a series circuit composed of the capacitor C4 and the capacitor C5 is connected in parallel with both ends of a series circuit composed of the resistor R3 and the resistor R4, a connecting line between the capacitor C4 and the capacitor C5 is connected with the non-inverting input terminal of the amplifier P5 and the series resistor R5 in series and then connected with the output terminal of the amplifier P5, an inverting input terminal of the amplifier P5 is connected in series with the resistor R5 and then grounded, a connecting line between the inverting input terminal of the amplifier P5 and the resistor R5 is connected with the output terminal of the amplifier P5 in series, an output terminal of the amplifier P5 is connected in series with the resistor R5 and then connected with the non-inverting input terminal of the amplifier P5, the inverting input end of the amplifier P3 is connected with the output end of the amplifier P3 and the wiring terminal a after being connected with the resistor R9 in series, the capacitor C6 is connected with the two ends of the resistor R9 in parallel, and the filter circuit 22 can filter out high-frequency clutter and low-frequency fluctuation, so that signals are more stable.

As shown in fig. 4, the I-V conversion circuit 23 includes an amplifier a1, the model of the amplifier a1 being AD549 JH; the output end of the filter circuit 22 is connected with a connection terminal b, the connection terminal b is respectively connected with one end of a capacitor C7, one end of a resistor R10 and the inverting input end of an amplifier a1, the other end of the capacitor C7 is respectively connected with one end of a resistor R11, one end of a resistor R12 and the output end of an amplifier a1, the other end of the resistor R11 is connected with the other end of a resistor R10, the other end of a resistor R12 is respectively connected with one end of a capacitor C10 and the input end of an a/D conversion circuit 24, the other end of the capacitor C10 is connected with the negative power supply end of the amplifier a1 after being connected with the capacitor C9 in series, a connection line between the capacitor C10 and the capacitor C9 is connected with the non-inverting input end of the amplifier a1, the positive power supply end of the amplifier a1 is connected with a 5V power supply terminal, and a connection line between the positive power supply end of the amplifier a1 and a 5V power supply terminal is connected with a capacitor C8 in series and then grounded; specifically, the capacitor C7 plays a role in filtering, the resistor R10 and the resistor R11 serve as proportional resistors for amplifying output, the capacitor C8 and the capacitor C9 play a role in power supply filtering, and the resistor R12 and the capacitor C10 perform resistance-capacitance filtering on the output voltage of the circuit, so that the next-stage circuit can obtain a pure input signal.

The A/D conversion circuit 24 comprises an A/D conversion chip U2, the model of the A/D conversion chip U2 is ADC0804, and the model of the singlechip U1 is AT89C 51; the WR end of the A/D conversion chip U2 is connected with the P3.4 end of the singlechip U1, the RD end of the A/D conversion chip U2 is connected with the P3.3 end of the singlechip U1, the CS end of the A/D conversion chip U2 is connected with the P3.2 end of the singlechip U1, the CLKIN end of the A/D conversion chip U2 is connected with a capacitor C11 IN series and is respectively connected with the IN-end of the A/D conversion chip U2, the AGND end of the A/D conversion chip U2 and the DGND end of the A/D conversion chip U2 and then is grounded, a connecting line between the DGND end of the A/D conversion chip U2 and the grounding end is sequentially connected with a resistor R15 IN series, a resistor R14 and then is connected with a 5V power supply end, a connecting line between the resistor R15 and the resistor R14 is connected with the REF end of the A/D conversion chip U2, the IN + end of the A/D conversion chip U2 is connected with the output end of the I-V conversion circuit, and the DB 467 end of the singlechip U467, the DB6 end of the A/D conversion chip U2 is connected with the P1.6 end of the single chip microcomputer U1, the DB5 end of the A/D conversion chip U2 is connected with the P1.5 end of the single chip microcomputer U1, the DB4 end of the A/D conversion chip U2 is connected with the P1.4 end of the single chip microcomputer U1, the DB3 end of the A/D conversion chip U2 is connected with the P1.3 end of the single chip microcomputer U1, the DB2 end of the A/D conversion chip U2 is connected with the P1.2 end of the single chip microcomputer U1, the DB1 end of the A/D conversion chip U2 is connected with the P1.1 end of the single chip microcomputer U1, and the DB0 end of the A/D conversion chip U2 is connected with the P1.0 end of the single chip microcomputer U1; the a/D conversion chip U2 in this embodiment is an 8-bit, single-channel, low-price a/D converter, and is mainly characterized in that: the analog-to-digital conversion time is about 100 us; the circuit facilitates TTL or CMOS standard interfaces, can meet differential voltage input, has a reference voltage input end, is internally provided with a clock generator, and has low price and wide application range.

As shown in fig. 5, the power supply circuit 26 includes a transformer U3, a diode D2, a diode D3, a diode D4, a diode D5, a regulator IC1, a regulator IC2, and a regulator IC3, where the models of the regulator IC1 and the regulator IC2 are both LM317, and the models of the regulator IC3 are both LM 7805; the 220V power supply is sequentially reduced in voltage through a transformer U1, rectified by a bridge circuit consisting of diodes D2-D5, filtered by a capacitor C15 and then connected with a Vin end of a voltage stabilizer IC1, a GND end of the voltage stabilizer IC1 is grounded, a Vout end of a voltage stabilizer IC1 is respectively connected with a +12V power supply end, one end of an electrolytic capacitor C16, one end of a capacitor C17, a Vin end of a voltage stabilizer IC2, one end of an electrolytic capacitor C19, one end of a capacitor C20 and a Vin end of a voltage stabilizer IC3, the other end of an electrolytic capacitor C16 is respectively connected with the other end of a capacitor C17, the GND end of a voltage stabilizer IC2, one end of a capacitor C18, the other end of an electrolytic capacitor C18, the other end of a capacitor C20, the GND end of a voltage stabilizer IC3 and one end of a capacitor C21 and then grounded, the other end of a capacitor C18 is respectively connected with a Vout and a +9V power supply end of an IC2 and a power supply end of a voltage stabilizer IC 21; specifically, power supply circuit 26 can produce three kinds of different power supplies of 5V, 9V and 24V, the work is provided to singlechip U1 to the 5V power, 9V and 12V power are used for some peripheral circuits, the stabiliser chooses LM78XX series chip and the insurance that the model is WH250 fuse F1 for use, the required voltage of stabiliser can the stable output, and fuse F1 can be at the protection circuit under the overload condition and can resume automatically, the power can reach the needs that singlechip U1 and peripheral circuit work completely, the steady operation of system provides the prerequisite.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.