CN105784062A - Method and device for detecting material level in material bin - Google Patents

Method and device for detecting material level in material bin Download PDF

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Publication number
CN105784062A
CN105784062A CN201610228127.8A CN201610228127A CN105784062A CN 105784062 A CN105784062 A CN 105784062A CN 201610228127 A CN201610228127 A CN 201610228127A CN 105784062 A CN105784062 A CN 105784062A
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China
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material bin
cable
instrument
primary instrument
resistance
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CN201610228127.8A
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Chinese (zh)
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CN105784062B (en
Inventor
汪玉坤
赫健
徐少川
刘宇
娄莹
王玉昆
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University of Science and Technology Liaoning USTL
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University of Science and Technology Liaoning USTL
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/48—Arrangements of indicating or measuring devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The invention relates to a method and device for detecting the material level in a material bin. The device is characterized in that a measuring cable is arranged at the central axis of the circular metal material bin and is parallel with and insulated from the metal bin wall, the measuring cable and the metal bin wall form a parallel plate capacitor, and the capacitance of the parallel plate capacitor is the total capacitance CX of a material bin capacitive sensor; an electronic oscillating circuit is used to form a primary instrument, an RS-485 bus differential drive function is used to transmit a pulse sequence signal between the primary instrument and a secondary instrument, the change of the CX is converted into the corresponding pulse sequence signal and remotely transmitted to the secondary instrument, and the second instrument measures the cycle T of the pulse sequence signal; the material level L1 is obtained. The device is simple in overall structure, easy to implement, fast in detection, high in accuracy, simple to mount, low in cost, convenient for a user to use, free of a mechanical moving device, small in primary instrument size, light, and long in service life.

Description

The detection method of thing position height and device in a kind of material bin
Technical field
The present invention relates to material storage for field, particularly relate to detection method and the device of thing position height in a kind of material bin.
Background technology
In industrial and agricultural production activity, under many circumstances can spent material reserving chamber, such as the various liquid of chemical industry Or solids feed bin, the crude stockpile storehouse in petroleum recovering factory, bulk cement storage bin etc. during concrete production.These things Material has solid, powder, liquid, also has that conduct electricity and non-conductive.In process of production, it is desirable to grasp thing at any time The number of material in feed bin, the most simple method is exactly can the height of thing position in detectable substance feed bin at any time.Conventional thing position Detecting instrument chattering type, ultrasonic type, Weight type, float-ball type etc..The shortcoming of contact level meter is to detect continuous print Thing position；Although ultrasonic type level meter energy continuous detecting thing position, but its accuracy of detection is by material top surface shape in material bin Impact, the foam of liquid surface also influences whether its accuracy of detection；Weight type level meter is only suitable for measuring the height of solids position, And having mechanical movement means, structure is complicated, runs noise big, the shortcomings such as energy consumption is big；Float-ball type level meter is only applicable to measure The height of liquids position.
Summary of the invention
For overcoming the deficiencies in the prior art, it is an object of the invention to provide the detection method of thing position height in a kind of material bin And device, improve detection speed, accuracy, easy to use.
For achieving the above object, the present invention is achieved through the following technical solutions:
The detection method of thing position height in a kind of material bin, comprises the following steps:
A is provided with a measurement cable at the central axis of circular metal material bin, measures cable parallel with metal silo wall, and Insulating with metal silo wall, measure cable and form a parallel plate capacitor with metal silo wall, the capacitance of parallel plate capacitor is material Storehouse capacitance sensor total capacitance CX；
B utilize electronic oscillating circuit form primary instrument, utilize RS-485 bus differential drive function, primary instrument with Transmission pulse sequence signal between secondary meter, by CXChange be converted into corresponding pulse sequence signal teletransmission to secondary instrument Table, the cycle T of pulse sequence signal measured by secondary meter；
C calculates material bin capacitance sensor total capacitance Cx:
c x = c 0 + c 1 + c 2
= C 0 + 2 π [ ϵ 0 L 0 + ( ϵ 1 - ϵ 0 ) L 1 ] ln D d - - - ( 1 )
In formula (1): C0The fixing stray capacitance not changed with the change of material in storehouse for capacitance；C1For material top Electric capacity with air as medium；C2For the electric capacity with material as medium；L0Height within material bin, is definite value；D is feed bin Diameter, d be measure cable diameter, L1Height for thing position；ε0It is dielectric constant of air, ε1It it is material dielectric constant；L1Send out During changing, CXChange therewith, L1With CXIt is directly proportional linear relationship, records CXValue, the height L of available thing position1；
L 1 = L 0 * ( T - T e ) T f - T e - - - ( 2 )
In formula (2): L0 is the height within material bin, it it is definite value；Te is pulse period during material bin hole capital after selling all securities, by hole capital after selling all securities Time adjust and obtain, be the lower limit of pulse period；Tf is material bin material pulse period when buying securities with all one's capital, material adjust when buying securities with all one's capital Arrive, be the upper limit of pulse period；T is the cycle of the pulse train of detection in real time, Te≤T≤Tf, as T=Te, and L1=0, thing Feed bin is empty, and as T=Tf, L1=L0, material bin is full；
D sets material lower limit alarming value, material upper limit alarm value and material bin completely protection value, by RS-232 interface and upper Position machine exchange data；After recording thing position height, by numeral method thing place value.
The detection device of thing position height in a kind of material bin, including measure cable, mounting flange, primary instrument circuit board, Primary instrument, the signal is far passed cable, tensioner, insulator, secondary meter, set primary instrument circuit board, once in primary instrument Instrument is connected with mounting flange, and the center of mounting flange is fixed one and measured cable, measures cable and insulate with mounting flange, surveys Amount cable and metal silo wall one capacitance sensor of composition of material bin, measure a cable pole plate as capacitance sensor, Connecting primary instrument circuit board by wire, the metal silo wall of material bin is as another pole plate of capacitance sensor, by leading Line connects primary instrument circuit board, and the lower end connection measuring cable has insulator, insulator to be connected with tensioner one end, tensioner The other end is fixed on material bin bottom center；Primary instrument is connected by the signal is far passed cable with secondary meter.
Described measurement cable surface, with insulating barrier, uses when measuring conductive material thing position.
Described primary instrument circuit board is made up of electronic multivibrator and driver U2, and electronic multivibrator includes Gate circuit U1A, gate circuit U1B, resistance R1, resistance R2, resistance R1 mono-terminates the input of gate circuit U1A, and gate circuit U1A's is defeated Go out end to be connected with resistance R2 one end, the input of gate circuit U1B, the output termination capacitance sensor CX input of gate circuit U1B End, the 3 input DI selecting the common port of 1 switch SW3_1, driver U2,3 select 1 switch SW3_1 to select to compensate electric capacity C1 or compensation Electric capacity C2 or do not select, in order to control the scope of primary instrument output signal frequency；The resistance R1 other end, the resistance R2 other end, Capacitor CX outfan, the compensation electric capacity C1 other end, the other end of compensation electric capacity C2 connect together, and form electronics multi-harmonic-oscillations Device, its output signal frequency is:
F O = 1 2.2 R 1 ( C X + C ) - - - ( 3 )
In formula (3), C is for compensating electric capacity, and signal is exported by the outfan of gate circuit U1B, and sends into the input of driver U2 DI, through the AB bus of driver U2, delivers to secondary meter by output conversion socket Jout by electrical pulse sequence signal, transmission Distance is less than 1200 meters；
Described secondary meter includes CPU U1, input socket JIN, pulsed signal device U4, display driver U2, shows Showing device U3, power supply, Simple key board, CPU U1, under the driving of software, receives the pulse signal that primary instrument transmits, it is achieved data Gather, data process, data show, Keyboard management, and bound is reported to the police, material fills it up with protection and communication function；
Particular circuit configurations is: the accessory power outlet Jout of primary instrument is by the input socket JIN of bus with secondary meter Being connected, the input socket JIN of secondary meter is connected in the AB bus of pulsed signal device U4, pulsed signal device U4's Output RO is connected to the P35 pin of CPU U1, data acquisition function；P10, P11, P12 pin of CPU U1 is coupled with On the pin of LOAD, CLK and DIN of display driver U2, DG0, DG1, DG2, DG3 pin of display driver U2 is coupled with On DG1, DG2, DG3, DG4 pin of display U3, the position completing display drives；The SGA of display driver U2, SGB, SGC, SGD, SGE, SGF, SGG, SGP, Iset pin is received on power supply through 10K resistance R2, completes display function；The P14 of CPU U1, P15, P16, P17 pin is coupled with on the Simple key board of tetra-buttons of MODE, RL, SET, OK composition, completes alert data, whole Given data function is set；The P00 pin of CPU U1 receives one end of resistance R3, the base of another termination audion Q1 of resistance R3 Pole, is driven buzzer BEEP by audion Q1, completes sound alarm function；The P01 pin of CPU U1 receives one end of resistance R5, The other end of resistance R5 receives the base stage of audion Q2, audion Q2 drive relay R AY1, and the normally closed of relay R AY1 is touched Point SW1 and SW2 No. 5 and No. 6 contact pins extractions by socket J-SP, seal in charging control circuit, complete material and fill it up with protection Function；P30, P31 of CPU U1 receives R1OUT, T1IN pin of communication level translator U5, and T1OUT, R1IN of U5 receive The 2 of socket communication JCOM, on 3 pins, the communication function with host computer is completed.
Compared with prior art, the invention has the beneficial effects as follows:
1. device overall structure is simply easily achieved, and speed is fast, accuracy is high, installation is simple, low cost in detection, and user makes With convenient.
2. mechanical telecontrol equipment, primary instrument volume is little, lightweight, and service life is long.
3. in secondary meter, use CPU, belong to an intelligent embedded system, be possible not only to detection, display Work, it is also possible to bound alarming value is set flexibly, storehouse completely protection value is set, it is also possible to complete the communication with host computer, real Existing data exchange work.
4. the algorithm that the data handling procedure of the inventive method uses is simple, calculates speed fast, and accuracy is high.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the detection method of thing position height in material bin.
Fig. 2 is primary instrument electrical schematic diagram.
Fig. 3 is secondary meter electrical schematic diagram.
Fig. 4 is the detection device application schematic diagram in the non-conductive material of powdery of thing position height in material bin.
Fig. 5 is the detection device application schematic diagram in liquid conduction material of thing position height in material bin.
Fig. 6 is secondary meter control flow chart.
In Fig. 4, Fig. 5: 1-measures cable 2-mounting flange 3-primary instrument circuit board 4-primary instrument shell 5-the signal is far passed cable 6-tensioner 7-insulator 8-insulating barrier.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is described in detail, it should be noted that the enforcement of the present invention does not limits In following embodiment.
See Fig. 1-Fig. 3, Fig. 6, the detection method of thing position height in a kind of material bin, comprise the following steps:
A is provided with a measurement cable at the central axis of circular metal material bin, measures cable parallel with metal silo wall, and Insulating with metal silo wall, measure cable and form a parallel plate capacitor with metal silo wall, the capacitance of parallel plate capacitor is material Storehouse capacitance sensor total capacitance CX；
B utilize electronic oscillating circuit form primary instrument, utilize RS-485 bus differential drive function, primary instrument with Transmission pulse sequence signal between secondary meter, by CXChange be converted into corresponding pulse sequence signal teletransmission to secondary instrument Table, the cycle T of pulse sequence signal measured by secondary meter；
C calculates material bin capacitance sensor total capacitance Cx:
c x = c 0 + c 1 + c 2 = C 0 + 2 π [ ϵ 0 L 0 + ( ϵ 1 - ϵ 0 ) L 1 ] l n D d - - - ( 1 )
In formula (1): C0The fixing stray capacitance not changed with the change of material in storehouse for capacitance；C1For material top Electric capacity with air as medium；C2For the electric capacity with material as medium；L0Height within material bin, is definite value；D is feed bin Diameter, d be measure cable diameter, L1Height for thing position；ε0It is dielectric constant of air, ε1It it is material dielectric constant；L1Send out During changing, CXChange therewith, L1With CXIt is directly proportional linear relationship, records CXValue, the height L of available thing position1；
L 1 = L 0 * ( T - T e ) T f - T e - - - ( 2 )
In formula (2): L0 is the height within material bin, it it is definite value；Te is pulse period during material bin hole capital after selling all securities, by hole capital after selling all securities Time adjust and obtain, be the lower limit of pulse period；Tf is material bin material pulse period when buying securities with all one's capital, material adjust when buying securities with all one's capital Arrive, be the upper limit of pulse period；T is the cycle of the pulse train of detection in real time, Te≤T≤Tf, as T=Te, and L1=0, thing Feed bin is empty, and as T=Tf, L1=L0, material bin is full；
D sets material lower limit alarming value, material upper limit alarm value and material bin completely protection value, by RS-232 interface and upper Position machine exchange data；After recording thing position height, by numeral method thing place value.
Seeing Fig. 4, Fig. 5, the detection device of thing position height in material bin, including measuring cable 1, mounting flange 2, primary instrument Circuit board 3, primary instrument, the signal is far passed cable 5, tensioner 6, insulator 7, secondary meter, set primary instrument in primary instrument Circuit board 3, primary instrument is connected with mounting flange 2, and the center of mounting flange 2 is fixed one and measured cable 1, measures cable 1 Insulate with mounting flange 2, measure metal silo wall one capacitance sensor of composition of cable 1 and material bin, measure cable 1 as electricity Holding a pole plate of sensor, connect primary instrument circuit board 3 by wire, the metal silo wall of material bin is as capacitance sensor Another pole plate, by wire connect primary instrument circuit board 3, measure cable 1 lower end connect have insulator 7, insulator 7 Being connected with tensioner 6 one end, tensioner 6 other end is fixed on material bin bottom center；Primary instrument and secondary meter are by letter Number teletransmission cable 5 connects.Measure cable 1 surface with insulating barrier 8, the use when measurement conductive material thing position.
Seeing that Fig. 2, primary instrument circuit board are made up of electronic multivibrator and driver U2, electronic multivibrator includes Gate circuit U1A, gate circuit U1B, resistance R1, resistance R2, resistance R1 mono-terminates the input of gate circuit U1A, and gate circuit U1A's is defeated Go out end to be connected with resistance R2 one end, the input of gate circuit U1B, the output termination capacitance sensor CX input of gate circuit U1B End, the 3 input DI selecting the common port of 1 switch SW3_1, driver U2,3 select 1 switch SW3_1 to select to compensate electric capacity C1 or compensation Electric capacity C2 or do not select, in order to control the scope of primary instrument output signal frequency；The resistance R1 other end, the resistance R2 other end, Capacitor CX outfan, the compensation electric capacity C1 other end, the other end of compensation electric capacity C2 connect together, and form electronics multi-harmonic-oscillations Device, its output signal frequency is:
F O = 1 2.2 R 1 ( C X + C ) - - - ( 3 )
In formula (3), C is for compensating electric capacity, and signal is exported by the outfan of gate circuit U1B, and sends into the input of driver U2 DI, through the AB bus of driver U2, delivers to secondary meter by output conversion socket Jout by electrical pulse sequence signal, transmission Distance is less than 1200 meters；Primary instrument electronic device detail list is listed in subordinate list 1.
See that Fig. 3, secondary meter include CPU U1, input socket JIN, pulsed signal device U4, display driver U2, show Showing device U3, power supply, Simple key board, CPU U1, under the driving of software, receives the pulse signal that primary instrument transmits, it is achieved data Gather, data process, data show, Keyboard management, and bound is reported to the police, material fills it up with protection and communication function；
Particular circuit configurations is: the accessory power outlet Jout of primary instrument is by the input socket JIN of bus with secondary meter Being connected, the input socket JIN of secondary meter is connected in the AB bus of pulsed signal device U4, pulsed signal device U4's Output RO is connected to the P35 pin of CPU U1, data acquisition function；P10, P11, P12 pin of CPU U1 is coupled with On the pin of LOAD, CLK and DIN of display driver U2, DG0, DG1, DG2, DG3 pin of display driver U2 is coupled with On DG1, DG2, DG3, DG4 pin of display U3, the position completing display drives；The SGA of display driver U2, SGB, SGC, SGD, SGE, SGF, SGG, SGP, Iset pin is received on power supply through 10K resistance R2, completes display function；The P14 of CPU U1, P15, P16, P17 pin is coupled with on the Simple key board of tetra-buttons of MODE, RL, SET, OK composition, completes alert data, whole Given data function is set；The P00 pin of CPU U1 receives one end of resistance R3, the base of another termination audion Q1 of resistance R3 Pole, is driven buzzer BEEP by audion Q1, completes sound alarm function；The P01 pin of CPU U1 receives one end of resistance R5, The other end of resistance R5 receives the base stage of audion Q2, audion Q2 drive relay R AY1, and the normally closed of relay R AY1 is touched Point SW1 and SW2 No. 5 and No. 6 contact pins extractions by socket J-SP, seal in charging control circuit, complete material and fill it up with protection Function；P30, P31 of CPU U1 receives R1OUT, T1IN pin of communication level translator U5, and T1OUT, R1IN of U5 receive The 2 of socket communication JCOM, on 3 pins, the communication function with host computer is completed.Secondary meter electronic device detail list is at subordinate list 2 In list.
When the present invention applies, primary instrument is installed on material bin top, and material bin height is generally 15-20 rice.Secondary instrument Table is installed in night shift room or control room, uses four core shielded cables (the signal is far passed cable) between primary instrument and secondary meter Transmission power supply and signal, wherein both threads is used for transmitting power supply, and another both threads differential signal transmission, in order to ensure that instrument is reliable Work, the length connecting cable between primary instrument and secondary meter not can exceed that 1200 meters.
Seeing Fig. 4, the device that in material bin, the detection method of thing position height uses is applied to the bulk water of concrete mixing plant In hopper dredger, the thing position height of cement in monitoring material bin, detection device using method is as follows:
Scale zero is calibrated, and in the case of material bin hole capital after selling all securities, to instrument power supply, presses two buttons of MODE and OK about simultaneously About 3 seconds, then decontrol the two button simultaneously, if now secondary meter display shows " 0000 ", then zero point is adjusted successfully. Otherwise, repeat the above steps, until secondary meter display shows " 0000 ".
Full scale is calibrated, and in material bin, charging is to the height full close to storehouse, and leaves stopping charging after certain surplus, Stand about 10 minutes, press two buttons of MODE and SET about about 3 seconds simultaneously, then decontrol the two button simultaneously, now two The data that secondary instrument display shows are the actual height of thing position.Complete to the work of this meter confirmation, can normally employ. If it is required, keyboard to set up upper and lower limit alarm point data can be passed through, set storehouse and completely protect point data.
As it is shown in figure 5, the device that in a kind of material bin, the detection method of thing position height uses is applied to have conductive characteristic Liquid material bin in, monitoring conducting liquid thing position height time, owing to the material in material bin is conducting liquid, use Middle measurement cable 1 surface insulating barrier to be had 8, it is ensured that measure and can not have contacting of electricity between cable 1 and metal silo wall.
The invention have the advantage that
1. device overall structure is simply easily achieved, and speed is fast, accuracy is high, installation is simple, low cost in detection, and user makes With convenient.
2. mechanical telecontrol equipment, primary instrument volume is little, lightweight, and service life is long.
3. in secondary meter, use CPU, belong to an intelligent embedded system, be possible not only to detection, display Work, it is also possible to bound alarming value is set flexibly, storehouse completely protection value is set, it is also possible to complete the communication with host computer, real Existing data exchange work.
4. the algorithm that the data handling procedure of the inventive method uses is simple, calculates speed fast, and accuracy is high.
Subordinate list 1 primary instrument electronic device detail list
Sequence number Title Type and spec Encapsulation Code name in circuit Quantity
1 Integrated circuit HCF4009 SOIC14 U1 1
2 Integrated circuit MAX487 SOIC8 U2 1
3 Chip-R 560K 0603 R1 1
4 Chip-R 56k 0603 R2 1
5 Patch capacitor 56P 0603 C1 1
6 Patch capacitor 100p 0603 C2 1
7 3 select 1 switch DIP_4 DIP8 SW3_1 1
8 Socket JST-4 CH2.0-4 Jout 1
。
Subordinate list 2 secondary meter electronic device detail list

Claims (5)

1. the detection method of thing position height in a material bin, it is characterised in that comprise the following steps:
A is provided with one at the central axis of circular metal material bin and measures cable, measures cable parallel with metal silo wall, and with gold Belonging to bulkhead insulation, measure cable and form a parallel plate capacitor with metal silo wall, the capacitance of parallel plate capacitor is material bin electricity Hold sensor total capacitance CX；
B utilizes electronic oscillating circuit to form primary instrument, utilizes RS-485 bus differential to drive function, at primary instrument and secondary Transmission pulse sequence signal between instrument, by CXChange be converted into corresponding pulse sequence signal teletransmission to secondary meter, The cycle T of pulse sequence signal measured by secondary meter；
C calculates material bin capacitance sensor total capacitance Cx:
c x = c 0 + c 1 + c 2 = C 0 + 2 π [ ϵ 0 L 0 + ( ϵ 1 - ϵ 0 ) L 1 ] ln D d - - - ( 1 )
In formula (1): C0The fixing stray capacitance not changed with the change of material in storehouse for capacitance；C1For material top with sky Gas is the electric capacity of medium；C2For the electric capacity with material as medium；L0Height within material bin, is definite value；D is the straight of feed bin Footpath, d is the diameter measuring cable, L1Height for thing position；ε0It is dielectric constant of air, ε1It it is material dielectric constant；L1Become During change, CXChange therewith, L1With CXIt is directly proportional linear relationship, records CXValue, the height L of available thing position1；
L 1 = L 0 * ( T - T e ) T f - T e - - - ( 2 )
In formula (2): L0 is the height within material bin, it it is definite value；Te is pulse period during material bin hole capital after selling all securities, by whole during hole capital after selling all securities Determine to obtain, be the lower limit of pulse period；Tf is material bin material pulse period when buying securities with all one's capital, material adjust when buying securities with all one's capital and obtain, It it is the upper limit of pulse period；T is the cycle of the pulse train of detection in real time, Te≤T≤Tf, as T=Te, and L1=0, material bin Being empty, as T=Tf, L1=L0, material bin is full；
D sets material lower limit alarming value, material upper limit alarm value and material bin completely protection value, by RS-232 interface and host computer Exchange data；After recording thing position height, by numeral method thing place value.
2. realize the detection device of thing position height in a kind of material bin of the detection method described in claim 1, it is characterised in that Including measuring cable, mounting flange, primary instrument circuit board, primary instrument, the signal is far passed cable, tensioner, insulator, secondary Instrument, sets primary instrument circuit board in primary instrument, primary instrument is connected with mounting flange, and the center of mounting flange fixes one Bar measures cable, measures cable and insulate with mounting flange, measures metal silo wall one capacitance sensing of composition of cable and material bin Device, measures a cable pole plate as capacitance sensor, connects primary instrument circuit board, the metal warehouse of material bin by wire Wall, as another pole plate of capacitance sensor, connects primary instrument circuit board by wire, and the lower end connection measuring cable has Insulator, insulator is connected with tensioner one end, and the tensioner other end is fixed on material bin bottom center；Primary instrument and secondary Instrument is connected by the signal is far passed cable.
The detection device of thing position height in a kind of material bin the most according to claim 2, it is characterised in that described measurement Cable surface, with insulating barrier, uses when measuring conductive material thing position.
The detection device of thing position height in a kind of material bin the most according to claim 2, it is characterised in that described once Appliance circuit plate is made up of electronic multivibrator and driver U2, and electronic multivibrator includes gate circuit U1A, gate circuit U1B, resistance R1, resistance R2, resistance R1 mono-terminates the input of gate circuit U1A, the outfan of gate circuit U1A and resistance R2 mono- End, the input of gate circuit U1B are connected, and the output of gate circuit U1B termination capacitance sensor CX input, 3 select 1 switch SW3_ The common port of 1, the input DI of driver U2,3 select 1 switch SW3_1 to select compensate electric capacity C1 or compensate electric capacity C2 or do not select, In order to control the scope of primary instrument output signal frequency；The resistance R1 other end, the resistance R2 other end, capacitor CX outfan, Compensate the electric capacity C1 other end, the other end of compensation electric capacity C2 connects together, and forms electronic multivibrator, its output signal frequency Rate is:
F O = 1 2.2 R 1 ( C X + C ) - - - ( 3 )
In formula (3), C is for compensating electric capacity, and signal is exported by the outfan of gate circuit U1B, and sends into the input DI of driver U2, Through the AB bus of driver U2, by output conversion socket Jout, electrical pulse sequence signal is delivered to secondary meter, transmit away from From less than 1200 meters.
The detection device of thing position height in a kind of material bin the most according to claim 2, it is characterised in that described secondary Instrument includes CPU U1, input socket JIN, pulsed signal device U4, display driver U2, display U3, power supply, simple key Dish, CPU U1, under the driving of software, receives the pulse signal that primary instrument transmits, it is achieved data acquisition, data process, data Display, Keyboard management, bound is reported to the police, material fills it up with protection and communication function；
Particular circuit configurations is: the accessory power outlet Jout of primary instrument is connected with the input socket JIN of secondary meter by bus, The input socket JIN of secondary meter is connected in the AB bus of pulsed signal device U4, the output of pulsed signal device U4 RO is connected to the P35 pin of CPU U1, data acquisition function；P10, P11, P12 pin of CPU U1 is coupled with display On the pin of LOAD, CLK and DIN of driver U2, DG0, DG1, DG2, DG3 pin of display driver U2 is coupled with display On DG1, DG2, DG3, DG4 pin of device U3, the position completing display drives；The SGA of display driver U2, SGB, SGC, SGD, SGE, SGF, SGG, SGP, Iset pin is received on power supply through 10K resistance R2, completes display function；The P14 of CPU U1, P15, P16, P17 pin is coupled with on the Simple key board of tetra-button compositions of MODE, RL, SET, OK, completes alert data, number of adjusting According to function is set；The P00 pin of CPU U1 receives one end of resistance R3, the base stage of another termination audion Q1 of resistance R3, Driven buzzer BEEP by audion Q1, complete sound alarm function；The P01 pin of CPU U1 receives one end of resistance R5, electricity The other end of resistance R5 receives the base stage of audion Q2, audion Q2 drive relay R AY1, the normally-closed contact of relay R AY1 SW1 and SW2 No. 5 and No. 6 contact pins extractions by socket J-SP, seal in charging control circuit, complete material and fill it up with protection merit Energy；P30, P31 of CPU U1 receives R1OUT, T1IN pin of communication level translator U5, and T1OUT, R1IN of U5 receives logical On news the 2 of socket JCOM, 3 pins, complete the communication function with host computer.
CN201610228127.8A 2016-04-13 2016-04-13 The detection method and device of level height in a kind of material bin Expired - Fee Related CN105784062B (en)

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