CN108844969B - Coal-feeding purity measuring system for mine conveying belt - Google Patents
Coal-feeding purity measuring system for mine conveying belt Download PDFInfo
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Abstract
The invention provides a coal purity measuring system on a mine conveyor belt, which comprises a microwave transmitting unit, a microwave receiving unit, a filtering unit, a data storage unit and a control unit, wherein the microwave transmitting unit is used for transmitting L microwaves M used for penetrating through a coal seam transmitted on the mine conveyor belt in a time-sharing mode, the microwave receiving unit is used for receiving microwaves N corresponding to L microwaves M after penetrating through the coal seam transmitted on the mine conveyor belt, the filtering unit is used for filtering each microwave N received by the microwave receiving unit, the data storage unit is used for storing data of the system, the control unit is used for calculating the coal purity y of the coal seam transmitted on the mine conveyor belt corresponding to L microwave N respectively based on each microwave N filtered by the filtering unit and corresponding information stored in the data storage unit, and the control unit is also used for calculating the average value of the L coal purity y, namely the coal purity Y of the coal seam transmitted on the mine conveyor belt.
Description
Technical Field
The invention relates to the field of coal mines, in particular to a coal purity measuring system on a mine conveying belt, which is used for detecting the coal purity of a coal bed conveyed on the coal mine conveying belt.
Background
The purity detection of coal currently comprises an X-ray coal purity detection method based on particle swarm optimization clustering, the method is high in cost and high in potential safety hazard, and the use of radioactive materials also requires a complex process of a national regulatory organization.
Based on this, the patent document with the publication number of CN201837595U discloses a microwave detection device for detecting moisture in coal on a mine conveyor belt, which not only can detect the moisture content of coal relatively quickly and accurately, but also can not be easily affected by the external environment, and is suitable for detecting the moisture in coal on the conveyor belt at a mine underground transfer point.
However, practice shows that coal transported on the mine conveyor belt sometimes contains coal gangue, and the coal purity of the coal currently transported on the mine conveyor belt cannot be directly given through the existing equipment, which is inconvenient for users to use to a certain extent.
In addition, in the actual use process, the requirement of strict alignment needs to be met between the microwave transmitting unit and the microwave receiving unit, otherwise, the final detection precision is affected. The microwave detection equipment for detecting the moisture content of the coal on the mine conveyor belt does not disclose a position adjusting mechanism of the microwave transmitting unit and the microwave receiving unit, and the microwave transmitting unit and the microwave receiving unit are not convenient to adjust and align, so that the difficulty of adjusting and aligning is increased to a certain extent, and the risk of misalignment of the microwave transmitting unit and the microwave receiving unit is also increased to a certain extent.
In addition, the prior art also has a remote alarm function, and is not convenient for remote monitoring.
This is a disadvantage of the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a coal purity measuring system on a mine conveying belt, which is used for detecting the purity of coal conveyed on the coal mine conveying belt.
In order to solve the technical problem, the invention provides a coal purity measuring system on a mine conveyer belt, which comprises:
the microwave transmitting unit is used for transmitting L microwaves M for penetrating through a coal seam conveyed on a coal mine conveyor belt in a time-sharing mode, and the frequency of the L microwaves M is different;
the microwave receiving unit is used for receiving the microwaves N corresponding to the L microwaves M after the microwaves M respectively pass through the coal bed conveyed by the coal mine conveyor belt;
the filtering unit is connected with the microwave receiving unit and is used for filtering each microwave N received by the microwave receiving unit;
a data storage unit for storing data of the system, wherein the stored data comprises power P1 and phase of each of the L microwaves M stored in advance;
the control unit is respectively connected with the filtering unit and the data storage unit and is used for respectively calculating the coal distribution purity Y of the coal bed transmitted on the coal mine conveying belt corresponding to the L microwaves N on the basis of the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance and calculating the average value of the L coal distribution purities Y, wherein the average value is the coal purity Y of the coal bed transmitted on the coal mine conveying belt;
and the touch screen display unit is connected with the control unit, is used for displaying the coal purity Y currently calculated by the control unit in real time, and is also used for modifying or setting parameters of the measurement system.
Wherein L =3, and the frequencies of the 3 microwaves M are respectively 8GHZ, 9.4GHZ and 10 GHZ.
The system for measuring the coal purity on the mine conveyor belt further comprises a data uploading unit, wherein the data uploading unit is connected with the control unit and is used for transmitting the coal purity Y currently calculated by the control unit to the upper computer in real time.
The data uploading unit adopts an RS485 communication module.
The upper computer is connected with an alarm and is used for sending out an alarm signal when the coal purity Y received by the upper computer is less than the preset coal purity; the alarm include transparent shell to and set up montant, the vertical fan of blowing upwards in transparent shell and can establish with sliding from top to bottom annular colored ball on the montant, the top at transparent shell is fixed at the top of montant, the bottom of montant is equipped with the spacing pin that is used for preventing annular colored ball roll-off montant, the fan be located under the montant.
The method for respectively calculating the coal separation purity y of the coal seam transmitted on the coal mine conveying belt corresponding to each of the L microwaves N by the control unit based on each microwave N filtered by the filtering unit and the power P1 and the phase of each of the L microwaves M stored in the data storage unit in advance comprises the following steps:
correspondingly receiving and respectively performing analog-to-digital conversion on each microwave N filtered by the filtering unit;
correspondingly acquiring the power spectrum and the phase spectrum of each microwave N after the analog-to-digital conversion;
correspondingly calculating the power P2 of each microwave N based on the obtained power spectrum of each microwave N;
calculating an attenuation amount A of each microwave M attenuated to the corresponding microwave N based on the calculated power P2 and the prestored power P1 of the corresponding microwave M corresponding to each microwave N;
calculating respective phase shift Ψ of each corresponding microwave M based on the obtained phase spectrum of each microwave N and a prestored phase of the corresponding microwave M corresponding to each microwave N;
calculating the content ratio X of coal to coal gangue in a coal bed currently conveyed on a coal mine conveyor belt based on the calculated phase shift Ψ of each microwave M, wherein X = К× [ (423 × Ψ) -23]/(1.57+ Ψ), wherein К is an adjustment parameter, and the value range of К is 0.5-1.5;
and calculating the coal separation purity y of the currently conveyed coal bed on the coal mine conveying belt correspondingly detected by the L microwaves M respectively based on a formula y =1-A-X, wherein A and X in the formula sequentially represent the calculated corresponding attenuation A and the content ratio of coal to coal gangue corresponding to the corresponding microwaves M corresponding to the current coal separation purity y in the formula.
Wherein, the microwave transmitting unit and the microwave receiving unit are respectively provided with a mounting seat;
the mounting seat comprises a first movable supporting plate and a second movable supporting plate which are arranged in parallel, the second movable supporting plate is positioned above the first movable supporting plate, a frame is sleeved on the periphery of the first movable supporting plate in the circumferential direction, two first guide rods are arranged on the first movable supporting plate in a penetrating way in a relatively sliding way and are distributed in parallel, and two ends of each first guide rod are respectively mounted on the frame;
the frame is provided with a guide groove, and the length direction of the guide groove is parallel to the axial direction of the first guide rod;
the second movable supporting plate is provided with a mounting hole for fixing the microwave transmitting unit or the microwave receiving unit, two second guide rods are arranged on the second movable supporting plate in a penetrating way and can slide relatively, the two second guide rods are distributed in parallel, and two ends of each second guide rod are bent downwards and then fixed on the first movable supporting plate; each second guide rod is respectively vertical to the first guide rod;
a first transmission screw hole is formed in the first transmission support plate, a first transmission screw rod is arranged in the first transmission screw hole in a matched mode, and the first transmission screw rod penetrates through the first transmission screw hole in a threaded mode; the first transmission screw rod can rotatably penetrate through the frame and is fixed on the first adjusting block; a first fastening nut is arranged at one end, adjacent to the first adjusting block, of the part, located in the frame, of the first transmission screw rod;
a second transmission screw hole is formed in the second movable support plate, and a second transmission screw rod for driving the second movable support plate to move on the second guide rod is arranged on the second transmission screw hole in a matching mode; the second transmission screw penetrates through the second transmission screw hole in a threaded manner, the second transmission screw can rotatably penetrate through the guide groove and is fixed on the second adjusting block, and the second transmission screw is in sliding fit with the guide groove; and one end of the part of the second transmission screw rod, which is positioned in the frame and is adjacent to the second adjusting block, is provided with a second fastening nut.
Wherein, the control unit adopts an MSP430FR5994 singlechip.
Compared with the prior art, the invention has the advantages that:
(1) according to the coal purity measuring system on the mine conveyor belt, the control unit can respectively calculate the coal purity Y of the coal bed transmitted on the coal mine conveyor belt corresponding to the L microwaves N based on the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance, and further calculate the coal purity Y of the coal bed transmitted on the coal mine conveyor belt by calculating the average value of the L coal purity Y, so that related workers can directly know the coal purity of the coal bed transmitted on the coal mine conveyor belt, and the system is practical.
(2) The invention relates to a coal purity measuring system on a mine conveyer belt, wherein a mounting seat comprises a first movable supporting plate and a second movable supporting plate which are arranged in parallel, a mounting hole for fixing a microwave transmitting unit or a microwave receiving unit is arranged on the second movable supporting plate, a first guide rod is arranged on the first movable supporting plate in a penetrating way in a relatively sliding way, a second guide rod is arranged on the second movable supporting plate in a penetrating way in a relatively sliding way, wherein the first movable supporting plate is provided with a first transmission screw rod, the second movable supporting plate is provided with a second transmission screw rod, under the cooperative transmission action of the first transmission screw and the second transmission screw, the position of the microwave transmitting unit or the microwave receiving unit arranged on the second movable supporting plate can be adjusted, the alignment convenience of the microwave transmitting unit or the microwave receiving unit is further improved, and the use convenience of the coal purity measuring system on the mine conveyer belt is further improved to a certain extent.
(3) The coal purity measuring system on the mine conveying belt comprises the alarm, and when the coal purity Y currently received by the upper computer is smaller than the preset coal purity, the alarm can send an alarm signal, so that a monitoring end user can more obviously find out the phenomenon that the coal purity Y of the coal conveyed on the conveying belt is smaller than the preset coal purity, and the coal purity measuring system is convenient to correspondingly process and is practical.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
Fig. 1 is a schematic block diagram of a coal purity measuring system of a mine conveyor belt according to an embodiment 1 of the present invention.
Fig. 2 is a schematic block diagram of embodiments 2 and 3 of the system for measuring purity of coal on a mine conveyor belt according to the present invention.
Fig. 3 is a schematic structural view of the mounting seat in embodiment 3 of the system for measuring purity of coal on a mine conveyor belt according to the present invention.
Fig. 4 is a schematic view of the alarm shown in fig. 2.
Wherein: 1. the electric fan comprises a first movable supporting plate, a first guide rod, a first transmission screw rod, a first adjusting block, a frame, a first fastening nut, a second movable supporting plate, a second guide rod, a second adjusting screw rod, a first adjusting block, a frame, a second adjusting block, a first fastening nut, a second fastening supporting plate, a second guiding rod, a second adjusting screw rod, a guide groove, a second adjusting block, a second fastening nut, a mounting hole, a transparent shell, a second guiding rod, a second adjusting block, a second fastening nut, a.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Embodiment mode 1:
FIG. 1 is a schematic diagram of an embodiment of a system for measuring the purity of coal on a mine conveyor belt according to the present invention. In this embodiment, the system for measuring the purity of the coal on the mine conveyor belt comprises a microwave transmitting unit, a microwave receiving unit, a filtering unit, a data storage unit, a control unit, a touch screen display unit, a data uploading unit and an upper computer.
The microwave transmitting unit is used for transmitting 3 microwaves M for penetrating through a coal seam conveyed on a coal mine conveyor belt in a time-sharing mode, and the frequencies of the 3 microwaves M are different and are respectively 8GHZ, 9.4GHZ and 10 GHZ.
The microwave receiving unit is used for receiving the microwaves N corresponding to the 3 microwaves M transmitted by the microwave transmitting unit after the microwaves M respectively pass through the coal bed conveyed on the coal mine conveying belt. Wherein, each microwave M corresponds to a microwave N after passing through the coal bed conveyed on the coal mine conveying belt.
And the filtering unit is connected with the microwave receiving unit and is used for filtering each microwave N received by the microwave receiving unit.
The data storage unit is used for data storage of the system, and the stored data comprises the prestored power P1 and the prestored phase of each of the L microwaves M.
The control unit is respectively connected with the filtering unit and the data storage unit, and is used for respectively calculating the coal distribution purity Y of the coal seam transmitted on the coal mine conveying belt corresponding to the L microwaves N based on the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance, and calculating the average value of the L coal distribution purities Y, wherein the average value is the coal purity Y of the coal seam transmitted on the coal mine conveying belt.
And the touch screen display unit is connected with the control unit, is used for displaying the coal purity Y currently calculated by the control unit in real time, and is also used for modifying or setting parameters of the measurement system.
And the data uploading unit is connected with the control unit and is used for transmitting the coal purity Y currently calculated by the control unit to the upper computer in real time. The upper computer is used for remotely monitoring the coal purity Y of the coal bed conveyed on the coal mine conveying belt.
The method for respectively calculating the coal separation purity y of the coal seam transmitted on the coal mine conveying belt corresponding to the L microwaves N by the control unit based on the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance comprises the following steps:
correspondingly receiving and respectively performing analog-to-digital conversion on each microwave N filtered by the filtering unit;
correspondingly acquiring the power spectrum and the phase spectrum of each microwave N after the analog-to-digital conversion;
correspondingly calculating the power P2 of each microwave N based on the obtained power spectrum of each microwave N;
calculating an attenuation amount A of each microwave M attenuated to the corresponding microwave N based on the calculated power P2 and the prestored power P1 of the corresponding microwave M corresponding to each microwave N;
calculating respective phase shift Ψ of each corresponding microwave M based on the obtained phase spectrum of each microwave N and a prestored phase of the corresponding microwave M corresponding to each microwave N;
calculating the content ratio X of coal to coal gangue in a coal bed currently conveyed on a coal mine conveyor belt based on the calculated phase shift Ψ of each microwave M, wherein X = К× [ (423 × Ψ) -23]/(1.57+ Ψ), wherein К is an adjustment parameter, and the value range of К is 0.5-1.5;
and calculating the coal separation purity y of the currently conveyed coal bed on the coal mine conveying belt correspondingly detected by the L microwaves M respectively based on a formula y =1-A-X, wherein A and X in the formula sequentially represent the calculated corresponding attenuation A and the content ratio of coal to coal gangue corresponding to the corresponding microwaves M corresponding to the current coal separation purity y in the formula.
Specifically, taking a certain microwave N (hereinafter referred to as "microwave N1") filtered by the filtering unit as an example, the method for calculating the coal separation purity y of the coal seam conveyed on the coal mine conveying belt corresponding to the microwave N1 by the control unit based on the microwave N1 and the power P1 and the phase of the corresponding microwave M corresponding to the microwave N1 and stored in the data storage unit in advance comprises the following steps P1-P6:
step p1, the control unit receives and performs analog-to-digital conversion on the microwave N1, and then obtains the power spectrum and the phase spectrum of the microwave N1 after the analog-to-digital conversion;
step P2, the control unit calculates the power P2 of the microwave N1 after the analog-to-digital conversion based on the acquired power spectrum of the microwave N1 after the analog-to-digital conversion;
step P3, the control unit calculates the attenuation A1 of the microwave N1 from the corresponding microwave M corresponding to the microwave N1 based on the power P2 of the microwave N1 after analog-to-digital conversion and the pre-stored power P1 of the corresponding microwave M corresponding to the microwave N1;
step p4, the control unit calculates a phase shift Ψ 1 of the corresponding microwave M corresponding to the microwave N1 based on the acquired phase spectrum of the analog-to-digital converted microwave N1 and a prestored phase of the corresponding microwave M corresponding to the microwave N1;
step p5, calculating a content ratio X1 of coal and coal gangue in a currently conveyed coal seam on a coal mine conveyor belt by a control unit based on the calculated phase shift Ψ 1 of the corresponding microwave M corresponding to the microwave N1, wherein X1= К× [ (423 × Ψ 1) -23]/(1.57+ Ψ 1), К is an adjustment parameter, and the value range of К is 0.5-1.5;
and step p6, the control unit substitutes the calculated A1 and X1 into a formula y1=1-A1-X1, and further calculates the coal separation purity y1 of the currently conveyed coal seam on the coal mine conveying belt detected by the corresponding microwave M corresponding to the microwave N1.
In summary, when the system is used, the microwave transmitting unit and the microwave receiving unit are oppositely arranged on two sides of the mine conveyor belt, microwaves transmitted by the microwave transmitting unit can penetrate through the coal bed on the conveyor belt and can be received by the microwave receiving unit, then corresponding values of the adjusting parameters К are set through the touch screen display unit, and the coal purity of the coal bed on the mine conveyor belt can be detected through the system by switching on a power supply.
Specifically, when the device is used, 3 microwaves M are transmitted in a time-sharing mode through the microwave transmitting unit, the 3 microwaves M penetrate through a coal seam on a mine conveying belt and are received by the microwave receiving unit respectively, then the microwaves are transmitted to the filtering unit by the microwave receiving unit respectively for filtering, the microwaves are transmitted to the control unit after being filtered, and then the control unit is used for calculating the coal purity of the coal seam currently transmitted on the coal mine conveying belt by combining an adjustment parameter К value input through the touch screen display unit and corresponding power P1 and phases pre-stored in the data storage unit.
In addition, in this embodiment, the control unit employs an MSP430FR5994 single chip microcomputer, and the data uploading unit employs an RS485 communication module. The MSP430FR5994 single chip microcomputer is provided with 12-bit ADC with up to 20 input channels, so that analog-to-digital conversion of microwave signals sent by the filtering unit is facilitated, and subsequent processing of the signals by the MSP430FR5994 single chip microcomputer is facilitated.
In addition, the contents that are not described in detail in this specification are all contents that can be easily implemented by those skilled in the art according to the prior art, and are not described herein again in order to simplify the structure of the specification.
Embodiment mode 2:
fig. 2 and 4 show another embodiment of the coal purity measuring system for the mine conveyor belt according to the present invention, and compared with embodiment 1, the difference is that the coal purity measuring system for the mine conveyor belt according to the present invention has an alarm connected to an upper computer thereof. As shown in fig. 4, the alarm is configured to send an alarm signal when the coal purity Y received by the upper computer is less than a preset coal purity. This alarm include transparent housing 14 to and set up montant 17, the vertical fan of blowing upwards in transparent housing 14 and can establish with sliding from top to bottom annular colored ball 18 on the montant 17, the top at transparent housing 14 is fixed at the top of montant 17, the bottom of montant 17 is equipped with the spacing pin 16 that is used for preventing annular colored ball 18 roll-off montant 17, the fan be located under montant 17.
When the device is used, when the purity of the coal currently received by the upper computer is less than the preset coal purity, the upper computer controls the electric fan 15 to operate, the annular color balls 18 move upwards along the vertical rods 17 under the blowing of the electric fan 15 until the annular color balls move to abut against the transparent shell 14, and therefore a monitoring end user can find the phenomenon that the purity of the coal bed currently transmitted on the conveying belt is less than the preset coal purity obviously, and corresponding processing is performed conveniently.
Embodiment mode 3:
fig. 2 and 3 show another embodiment of the coal purity measuring system for a mine conveyer belt according to the present invention, which differs from embodiment 2 in that the microwave transmitting unit and the microwave receiving unit of the coal purity measuring system for a mine conveyer belt according to the present invention are each provided with a mounting seat. When in use, the microwave transmitting unit and the microwave receiving unit are respectively arranged on the corresponding mounting seats.
As shown in fig. 3, the mounting seat includes a first movable supporting plate 1 and a second movable supporting plate 7 which are arranged in parallel, the second movable supporting plate 7 is located above the first movable supporting plate 1, a frame 5 is sleeved on the periphery of the first movable supporting plate 1, two first guide rods 2 are arranged on the first movable supporting plate 1 in a penetrating manner in a relatively sliding manner, the two first guide rods 2 are distributed in parallel, and two ends of each first guide rod 2 are respectively mounted on the frame 5. The frame 5 is provided with a guide groove 10, and the length direction of the guide groove 10 is parallel to the axial direction of the first guide rod 2. The second movable supporting plate 7 is provided with a mounting hole 13 for fixing a microwave transmitting unit or a microwave receiving unit, two second guide rods 8 are arranged on the second movable supporting plate 7 in a penetrating way and can slide relatively, the two second guide rods 8 are distributed in parallel, and two ends of each second guide rod 8 are bent downwards and then fixed on the first movable supporting plate 1; each second guide bar 8 is perpendicular to the first guide bar 2. The first transmission screw hole is formed in the first transmission support plate 1, the first transmission screw hole is provided with a first transmission screw rod 3 in a matched mode, and the first transmission screw rod 3 penetrates through the first transmission screw hole in a threaded mode. The first transmission screw 3 is rotatably fixed on the first adjusting block 4 through the frame 5. A first fastening nut 6 is mounted on one end of the portion of the first transmission screw 3 located inside the frame 5, adjacent to the first adjustment block 4. The second movable supporting plate 7 is provided with a second transmission screw hole which is provided with a second transmission screw 9 for driving the second movable supporting plate 7 to move on a second guide rod 8. The second transmission screw 9 penetrates through the second transmission screw hole in a threaded manner, the second transmission screw 9 rotatably penetrates through the guide groove 10 and is fixed on the second adjusting block 11, and the second transmission screw 9 is in sliding fit with the guide groove 10. One end of the portion of the second drive screw 9 located inside the frame 5 adjacent to the second adjustment block 11 is provided with a second fastening nut 12.
When the device is used, the first fastening nut 6 and the second fastening nut 12 are unscrewed, the first adjusting block 4 is rotationally adjusted, the first transmission screw 3 rotates, the first movable supporting plate 1 moves on the first guide rod 2 under the thread transmission action of the first transmission screw 3, the second movable supporting plate 7 and the second transmission screw 9 follow up, the second transmission screw 9 slides in the corresponding direction in the guide groove 10, and the first fastening nut 6 is fastened when the second movable supporting plate 7 is moved to the corresponding position on the first guide rod 2; then the second adjusting block 11 is adjusted in a rotating mode, the second transmission screw 9 rotates, and the second movable supporting plate 7 moves on the second guide rod 8 under the screw transmission effect of the second transmission screw 9. Therefore, after the microwave transmitting unit and the microwave receiving unit are respectively arranged on the corresponding second movable supporting plates 7, the purpose of adjusting the positions of the microwave transmitting unit and the microwave receiving unit can be achieved by adjusting the microwave transmitting unit and the microwave receiving unit, and due to the adoption of a thread adjusting mode, the convenience of adjusting the position alignment of the microwave transmitting unit and the microwave receiving unit is improved, and the microwave receiving unit is practical.
The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail 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 be modified or some 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.
Claims (7)
1. A mine conveyer belt coaling purity measurement system, comprising:
the microwave transmitting unit is used for transmitting L microwaves M for penetrating through a coal seam conveyed on a coal mine conveyor belt in a time-sharing mode, and the frequency of the L microwaves M is different;
the microwave receiving unit is used for receiving the microwaves N corresponding to the L microwaves M after the microwaves M respectively pass through the coal bed conveyed by the coal mine conveyor belt;
the filtering unit is connected with the microwave receiving unit and is used for filtering each microwave N received by the microwave receiving unit;
a data storage unit for storing data of the system, wherein the stored data comprises power P1 and phase of each of the L microwaves M stored in advance;
the control unit is respectively connected with the filtering unit and the data storage unit and is used for respectively calculating the coal distribution purity Y of the coal bed transmitted on the coal mine conveying belt corresponding to the L microwaves N on the basis of the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance and calculating the average value of the L coal distribution purities Y, wherein the average value is the coal purity Y of the coal bed transmitted on the coal mine conveying belt;
the touch screen display unit is connected with the control unit and used for displaying the coal purity Y currently calculated by the control unit in real time and modifying or setting parameters of the measurement system;
the method for respectively calculating the coal separation purity y of the coal seam transmitted on the coal mine conveying belt corresponding to the L microwaves N by the control unit based on the microwaves N filtered by the filtering unit and the power P1 and the phase of the L microwaves M stored in the data storage unit in advance comprises the following steps:
correspondingly receiving and respectively performing analog-to-digital conversion on each microwave N filtered by the filtering unit;
correspondingly acquiring the power spectrum and the phase spectrum of each microwave N after the analog-to-digital conversion;
correspondingly calculating the power P2 of each microwave N based on the obtained power spectrum of each microwave N;
calculating an attenuation amount A of each microwave M attenuated to the corresponding microwave N based on the calculated power P2 and the prestored power P1 of the corresponding microwave M corresponding to each microwave N;
calculating respective phase shift Ψ of each corresponding microwave M based on the obtained phase spectrum of each microwave N and a prestored phase of the corresponding microwave M corresponding to each microwave N;
calculating the content ratio X of coal to coal gangue in a coal bed currently conveyed on a coal mine conveyor belt based on the calculated phase shift Ψ of each microwave M, wherein X = К× [ (423 × Ψ) -23]/(1.57+ Ψ), wherein К is an adjustment parameter, and the value range of К is 0.5-1.5;
and calculating the coal separation purity y of the currently conveyed coal bed on the coal mine conveying belt correspondingly detected by the L microwaves M respectively based on a formula y =1-A-X, wherein A and X in the formula sequentially represent the calculated corresponding attenuation A and the content ratio of coal to coal gangue corresponding to the corresponding microwaves M corresponding to the current coal separation purity y in the formula.
2. The mine conveyor belt coal purity measurement system of claim 1,
l =3, and the frequencies of the 3 microwaves M are 8GHZ, 9.4GHZ and 10GHZ respectively.
3. The mine conveyor belt coal purity measurement system of claim 1 or 2,
the system also comprises a data uploading unit which is connected with the control unit and used for transmitting the coal purity Y currently calculated by the control unit to the upper computer in real time.
4. The system of claim 3, wherein the data upload unit employs an RS485 communication module.
5. The mine conveyor belt coaling purity measurement system of claim 3, wherein said upper computer is connected to an alarm for sending an alarm signal when the coal purity Y received by said upper computer is less than a predetermined coal purity; the alarm include transparent housing (14) to and set up montant (17), the vertical fan of blowing upwards in transparent housing (14) and can establish with sliding from top to bottom cyclic annular colored ball (18) on montant (17), the top at transparent housing (14) is fixed at the top of montant (17), the bottom of montant (17) is equipped with spacing pin (16) that are used for preventing cyclic annular colored ball (18) roll-off montant (17), the fan be located under montant (17).
6. The mine conveyor belt coal purity measuring system of claim 1, wherein the microwave transmitting unit and the microwave receiving unit are each provided with a mounting seat;
the mounting seat comprises a first movable supporting plate (1) and a second movable supporting plate (7) which are arranged in parallel, the second movable supporting plate (7) is positioned above the first movable supporting plate (1), a frame (5) is sleeved on the periphery of the first movable supporting plate (1) in the circumferential direction, two first guide rods (2) are arranged on the first movable supporting plate (1) in a penetrating mode in a relatively sliding mode, the two first guide rods (2) are distributed in parallel, and two ends of each first guide rod (2) are respectively mounted on the frame (5);
a guide groove (10) is formed in the frame (5), and the length direction of the guide groove (10) is parallel to the axial direction of the first guide rod (2);
the second movable supporting plate (7) is provided with a mounting hole (13) for fixing the microwave transmitting unit or the microwave receiving unit, two second guide rods (8) are arranged on the second movable supporting plate (7) in a penetrating way in a relatively sliding way, the two second guide rods (8) are distributed in parallel, and two ends of each second guide rod (8) are bent downwards and then fixed on the first movable supporting plate (1); each second guide rod (8) is respectively vertical to the first guide rod (2);
a first transmission screw hole is formed in the first transmission support plate (1), a first transmission screw rod (3) is arranged on the first transmission screw hole in a matched mode, and the first transmission screw rod (3) penetrates through the first transmission screw hole in a threaded mode; the first transmission screw (3) can rotatably penetrate through the frame (5) and is fixed on the first adjusting block (4); one end of the part of the first transmission screw rod (3) positioned in the frame (5) and adjacent to the first adjusting block (4) is provided with a first fastening nut (6);
a second transmission screw hole is formed in the second movable supporting plate (7), and a second transmission screw rod (9) used for driving the second movable supporting plate (7) to move on the second guide rod (8) is arranged on the second transmission screw hole; the second transmission screw (9) penetrates through the second transmission screw hole in a threaded manner, the second transmission screw (9) can rotatably penetrate through the guide groove (10) and is fixed on the second adjusting block (11), and the second transmission screw (9) is in sliding fit with the guide groove (10); one end of the part of the second transmission screw rod (9) positioned in the frame (5) and adjacent to the second adjusting block (11) is provided with a second fastening nut (12).
7. The system of claim 1 or 2, wherein the control unit is a MSP430FR5994 single-chip microcomputer.
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| CN201810546252.2A CN108844969B (en) | 2018-05-31 | 2018-05-31 | Coal-feeding purity measuring system for mine conveying belt |
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| CN108844969B true CN108844969B (en) | 2020-07-24 |
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