CN109579942A - Detect the capacitance sensor of foodstuff drying device material position - Google Patents
Detect the capacitance sensor of foodstuff drying device material position Download PDFInfo
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- CN109579942A CN109579942A CN201811611635.XA CN201811611635A CN109579942A CN 109579942 A CN109579942 A CN 109579942A CN 201811611635 A CN201811611635 A CN 201811611635A CN 109579942 A CN109579942 A CN 109579942A
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- 239000000463 material Substances 0.000 title claims abstract description 53
- 238000001035 drying Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000009434 installation Methods 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000005684 electric field Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 235000012550 Pimpinella anisum Nutrition 0.000 description 1
- 240000004760 Pimpinella anisum Species 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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
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Abstract
The invention discloses a kind of capacitance sensors for detecting foodstuff drying device material position, mainly include circuit board, metallic cable, the anode of mutual capacitive sensing and the cathode positioned at positive two sides；It is connected between the positive electrode and negative electrode by connector, the two sides of cathode pass through left fixing piece respectively, right fixing piece is fixed；The metallic cable sequentially passes through left fixing piece, cathode, connector, anode, connector, cathode, right fixing piece；The circuit board is located on left fixing piece or right fixing piece, is connected by conducting wire with anode, two cathode.Structure of the invention is a cylindrical capacitor, by measuring each sensor position grain whether there is or not determining material position, can real time on-line monitoring, detect the state of buying securities with all one's capital in time；Multiple sensors finally connect plastic packaging in PVC crust, are made into the form of flexible cable, will not get rusty, and surface is smooth not to press from both sides powder, and zonal cooling measurement, measuring accuracy is high, and structure is simple, easy for installation, the influence of not material feeding chamber structure and installation environment.
Description
Technical field
The present invention relates to measuring instrument fields, more particularly to a kind of capacitance sensor for detecting foodstuff drying device material position.
Background technique
Grasp of the foodstuff drying device for material position state at present, mostly only by being mounted on the Anti-rotation type material level switch of silo roof
To determine whether buying securities with all one's capital, once level switch goes wrong, being easy loading excessively leads to mechanical disorder, when grain is not filled,
Also it is difficult to grain material position situation in control storehouse.
Capacitor material position sensor (level sensor) based on capacitive measuring principle is to be widely used in material position survey
One of sensor of amount.Using material in feed bin as dielectric, the inspection to material in high aniseed library is realized using capacitance type sensor
Survey is one of means more convenient, practical at present.There are many level sensors, including electrode and tested feed bin both at home and abroad at present
Bulkhead constitute sectional capacitance sensor, measurement result is directly by the installation of the shape size, sensor of each tested feed bin
The factors such as position influence, and sensor position when changing with the movement of material in storehouse, and measurement result is also therewith
It changes；The sectional capacitance sensor of " string sugarcoated haws " formula, structure is complicated, is easy to be limited by height of materials parameter, in quilt
Measurement accuracy in the non-uniform situation of material is surveyed to be more difficult to meet user's requirement；Tubular type level sensor, the height according to material
The proportional principle of the capacitance signal exported with it, as long as detecting the end capacitor output valve, so that it may determine the height of material,
Being responsible for due to metal concentrates between pole and split pole gap to be limited by field condition, may cause material folding phenomenon, influences detector
Testing result and normal work.
Therefore it is urgent to provide a kind of novel level sensors to solve the above problems.
Summary of the invention
A kind of technical problem to be solved by the invention is to provide structures detection foodstuff drying device material simple, easy for installation
Position capacitance sensor, can real time on-line monitoring, detect the state of buying securities with all one's capital in time.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of detection foodstuff drying device is provided
The capacitance sensor of material position mainly includes circuit board, metallic cable, the anode of mutual capacitive sensing and bearing positioned at positive two sides
Pole；
It is connected between the positive electrode and negative electrode by connector, the two sides of cathode pass through left fixing piece, right fixing piece respectively
It is fixed；
The metallic cable sequentially passes through left fixing piece, cathode, connector, anode, connector, cathode, right fixing piece；
The circuit board is located on left fixing piece or right fixing piece, is connected by conducting wire with anode, two cathode.
In a preferred embodiment of the present invention, the metallic cable is by being located on the left of left fixing piece and on the right side of right fixing piece
Locked clip device is placed in the middle.
In a preferred embodiment of the present invention, the material of the positive electrode and negative electrode is stainless steel, is that diameter is identical
Coaxial cylinders.
In a preferred embodiment of the present invention, it is threadedly coupled between the positive electrode and negative electrode by connector.
In a preferred embodiment of the present invention, the two sides of the left fixing piece, right fixing piece and cathode are matched by interference
Close connection.
In a preferred embodiment of the present invention, the left fixing piece, right fixing piece include centrally located center
Through-hole and several radially-arranged circular through holes of central through hole.
In a preferred embodiment of the present invention, the left fixing piece, right fixing piece material be nylon, the connector
Material be polytetrafluoroethylene (PTFE).
In a preferred embodiment of the present invention, the circuit board includes regulated power supply, single-chip microcontroller, is connected with single-chip microcontroller
Frequency detection module, RS485 communication module；
The regulated power supply, for 5V input voltage to be converted to 3.3V power supply, be single-chip microcontroller, frequency detection module,
The power supply of RS485 communication module；
The single-chip microcontroller is mainly used for receiving the external interrupt signal of frequency detection module to calculate input capacitance value and defeated
Out；
Input end capacitor is changed using RC oscillation chip and establishes function with output square wave frequency by the frequency detection module
Relationship；
The RS485 communication module, for the communication between multiple sensors in series.
Further, the circuit board further includes the digital sensor being connected with single-chip microcontroller, the temperature for detection sensor
Degree.
Further, the shape of the capacitance sensor is cylinder, using single multi-point design, is encapsulated in flexible electrical
In cable, it is vertically fixed in grain heat-drying cabin in lacing wire.
The beneficial effects of the present invention are:
(1) structure of the invention is a cylindrical capacitor, the concentration pole using metallic cable as capacitor, positive electrode and negative electrode
It is the identical coaxial cylinders of diameter, by connector and fixing piece sealed envelope in the outside of metallic cable, using single multiple spot
Design, is encapsulated in flexible cable, is vertically fixed in grain heat-drying cabin in lacing wire, by measuring each sensor position grain
Food whether there is or not determining material position, can real time on-line monitoring, detect the state of buying securities with all one's capital in time；
(2) anode is located between two cathode, electric field line projected perpendicular to positive electrode surface after perpendicular to negative terminal surface
It injects, compared with parallel-plate and interdigital electrode capacitor, electric field line can be propagated in deeper space, and it is empty not only to expand measurement
Between, also advantageously improve the capacitance sensitivity of sensor；
(3) multiple sensors finally connect plastic packaging in PVC crust, are made into the form of flexible cable, will not get rusty, surface
Smooth not press from both sides powder, zonal cooling measurement, measuring accuracy is high, and structure is simple, easy for installation, not material feeding chamber structure and installation environment
Influence, no movable member, at the same be added measurement temperature function.
Detailed description of the invention
Fig. 1 is the cross-section structure signal of one preferred embodiment of capacitance sensor of present invention detection foodstuff drying device material position
Figure；
Fig. 2 is the structural schematic diagram of the anode；
Fig. 3 is the A-A sectional view of Fig. 2；
Fig. 4 is the structural schematic diagram of the cathode；
Fig. 5 is the B-B sectional view of Fig. 4；
Fig. 6 is the structural schematic diagram of the connector；
Fig. 7 is the schematic perspective view of the left fixing piece；
Fig. 8 is the main view of Fig. 7；
Fig. 9 is the C-C sectional view of Fig. 8；
Figure 10 is the D-D sectional view of Fig. 8；
Figure 11 is the structural schematic diagram of the right fixing piece；
Figure 12 is the side view of Figure 11；
Figure 13 is the schematic illustration of the capacitance sensor；
Figure 14 is the circuit diagram of the regulated power supply；
Figure 15 is the circuit diagram of the single-chip microcontroller and peripheral circuit；
Figure 16 is the circuit diagram of the RS485 communication module；
Figure 17 is the circuit diagram of the digital temperature sensor；
Figure 18 is the circuit diagram of the frequency detection module；
Figure 19 is data point and fitting function curve synoptic diagram.
The components in the drawings are labeled as follows: 1, circuit board, 2, metallic cable, 3, clip, 4, anode, 5, cathode, 6, connection
Part, 7, left fixing piece, 8, right fixing piece, 9, screw, 10, aperture, 11, central through hole, 12, circular through hole, 13, threaded hole, 14,
Cross section.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the present invention includes:
It is a kind of detect foodstuff drying device material position capacitance sensor, mainly include circuit board 1, metallic cable 2, clip 3, mutually
The anode 4 of capacitive sensing and cathode 5 positioned at positive 4 two sides.Connected between described positive 4 and cathode 5 by 6 screw thread of connector
It connects, the two sides of cathode 5 pass through left fixing piece 7 respectively, right fixing piece 8 passes through interference fit connection.The metallic cable 2 sequentially passes through
Left fixing piece 7, cathode 5, connector 6, positive 4, connector 6, cathode 5, right fixing piece 8, by being located at left 7 left side of fixing piece and the right side
The clip 3 on 8 right side of fixing piece is locked between two parties.The circuit board 1 is fixed on left fixing piece 7 by screw 9, respectively extraction wire
It is connected with 4, two cathode 5 of anode.
Described positive 4 with the material of cathode 5 be stainless steel, is the identical coaxial cylinders of diameter.Specifically, in conjunction with Fig. 2
And Fig. 3, described positive 4 be a cylinder, outer diameter 1.8cm, long 4cm, and both ends are equipped with internal screw thread, and middle part is equipped with an aperture 10,
For being connect with circuit board 1.In conjunction with Fig. 4 and Fig. 5, the cathode 5 is also a cylinder, length 3cm, maximum gauge 1.8cm, and one
End is equipped with internal screw thread, an aperture 10 is equipped with close to stepped part, for connecting with circuit board 1.
In conjunction with Fig. 6, the connector 6 be a rear wall cylinder, surface is stepped, both ends be equipped with external screw thread, for just
Cathode connection, it is preferred that the material of the connector 6 is polytetrafluoroethylene (PTFE).
In conjunction with Fig. 7, the left fixing piece 7 is the cylindrical body that one end has step with a cross section 14, the other end, crosscutting
Circuit board 1, is fixed on cross section 14 by threaded hole 13 there are two opening on face 14 by screw 9.It is described in conjunction with Fig. 8 to Figure 10
Left fixing piece 7 includes centrally located central through hole 11 and several the radially-arranged circular through holes 12 of central through hole 11, in
Heart through-hole 11 is used for across metallic cable 2, and circular through hole 12 is used for the conducting wire drawn across circuit board 1.
As shown in figure 11, cylindrical body of the right fixing piece 8 for one end with step also includes being located in conjunction with Figure 12
Central through hole 11 at center, with several the radially-arranged circular through holes 12 of central through hole 11, central through hole 11 be used for across
Metallic cable 2, circular through hole 12 are used for the conducting wire drawn across circuit board 1.
Preferably, wirerope, diameter 2.3mm can be used in the metallic cable 2.
Simple and clear to describe, the capacitance sensor of detection foodstuff drying device material position as described below is referred to as material position sensing
Device.
The structure of the level sensor be a cylindrical capacitor, the concentration pole using metallic cable 2 as capacitor, just
Pole 4 and cathode 5 are the identical coaxial cylinders of diameter, by connector 6 and fixing piece sealed envelope in the outside of metallic cable 2,
Multiple sensors finally connect plastic packaging in PVC crust, are encapsulated in flexible cable.It is located at two in conjunction with Figure 13, described positive 4
Between cathode 5, electric field line is injected after projecting perpendicular to positive 4 surfaces perpendicular to 5 surface of cathode, with parallel-plate and interdigital electrode electricity
Container is compared, and electric field line can be propagated in deeper space, is not only expanded measurement space, is also advantageously improved the electricity of sensor
Hold sensitivity.
The circuit board includes regulated power supply, single-chip microcontroller, the frequency detection module being connected with single-chip microcontroller, RS485 communication mould
Block, digital sensor.The circuit structure and principle of each circuit module are specifically described separately below:
Figure 14 is please referred to, the regulated power supply is used to 5V input voltage being converted to 3.3V power supply, is single-chip microcontroller, frequency inspection
Survey module, the power supply of RS485 communication module comprising voltage-stablizer D1C, capacitor C1-C3, each circuit components and connection relationship are such as
Shown in figure, voltage-stablizer D1C uses ADP1713, and capacitor C1 is connected in parallel between the input pin IN of D1C and GND pin, and connects 5V
Input voltage, one end of capacitor C2 is connect with output pin OUT and the 3.3V output voltage of voltage-stablizer D1C, the other end is grounded, electricity
One end of appearance C3 is connect with the SS pin of voltage-stablizer D1C, the other end is grounded.
The single-chip microcontroller calculates input capacitance value for receiving the external interrupt signal of frequency detection module and exports, connects
It receives the output signal of RS485 communication module and digital sensor and controls the RS485 communication module and digital sensor.In conjunction with
Figure 15, the single-chip microcontroller D1A use PIC24F16KA101, and peripheral circuit includes crystal oscillating circuit, power supply input circuit, program burning
Write port J1F, each circuit components and its connection relationship are as shown in figure 14.The of the both ends connection single-chip microcontroller D1A of crystal oscillating circuit
4,5 pin.Power circuit includes resistance R1, R2, capacitor C4, and resistance R1 and capacitor C4 form RC filter circuit, and the one of resistance R2
End connect with one end of resistance R1, the connection of the 18th pin of the other end and single-chip microcontroller D1A, after 3.3V voltage passes through RC filter circuit
Single-chip microcontroller power supply is input to through resistance R2.11st pin of the single-chip microcontroller is debugging test point tp3.
As shown in figure 16, the RS485 communication module includes communication chip MAX3485EESA, input terminal respectively with monolithic
Machine D1A the 3rd, 6, the connection of 8 pins, output end draws the port RS485_1+ and the port RS485_1- by a resistance and material position passes
The both ends of sensor connect, and realize the communication between multiple sensors in series.
The digital sensor is used for the temperature of detection sensor, and then can accurately calculate the grain under current grain temperature
Capacitor.As shown in figure 17, the digital sensor uses DS18B20, input voltage 3.3V, and the 1st pin is debugging test point
Tp1, and connect with the 13rd pin of single-chip microcontroller.
The frequency detection module, which is changed input end capacitor using RC oscillation chip, establishes function with output square wave frequency
Relationship triggers single-chip microcontroller external interrupt using output square wave failing edge, is computed by detection square-wave signal frequency defeated to measure
Enter capacitance.In conjunction with Figure 18, the RC oscillation chip D1B uses NIC1557, and peripheral circuit includes capacitor C5, C6, resistance
As shown, the 5th pin output end OUT is also as debugging test point tp2, the 1st draws for R3, R4, each component and its connection relationship
Foot draw port C+, port C+, GND1, GND2 respectively lead pass through left fixing piece three circular through holes after be welded to anode and
The middle part aperture of two cathode determines the frequency of output square wave after grain input capacitance inputs RC oscillation chip.
With temperature significant changes can occur for the aerial frequency of level sensor, and this variation cannot be ignored.At present
It is crust material PVC on the influence of the temperature drift of sensor, temperature drift influences as shown in the table.
The level sensor temperature drift Δ f of 1 PVC crust of tableBecome
Calibration operation is that level sensor is placed in air, records frequency at this time and temperature as calibration frequency fCalibration
(TCalibration) and calibration temperature TCalibration.According to the change rate of table 1, by calibration frequency fCalibration(TCalibration) it is converted into the frequency under current grain temperature
fCalibration(TGrain temperature), the calibration frequency referred to as after temperature adjustmemt.Frequency unit Khz, temperature unit DEG C.
fCalibration(TGrain temperature)=fCalibration(TCalibration)+ΔfBecome*(TCalibration-TGrain temperature) (1)
Shown in the formula such as formula (2) for being converted into capacitor using level sensor channel frequency, respectively by current sensor frequency
Rate fCurrently(TGrain temperature) and calibration frequency f after temperature adjustmemtCalibration(TGrain temperature) it is converted into Current Temperatures lower sensor capacitor CCurrently(TGrain temperature)
With the calibration capacitance C after temperature adjustmemtCalibration(TGrain temperature)。
Level sensor frequency and capacitance fitting function and factor standard are poor, the fitting function of frequency and capacitance are as follows:
Wherein, x-frequency values, unit kHz；Y-capacitance, unit pF.
The Adj.R-Square (the correction coefficient of determination) of fitting function is 0.99872, and coefficient and standard deviation are respectively as follows:
| Value | Standard Error | |
| A | 6.99956E-4 | 1.3631E-5 |
| B | 0.00373 | 4.56156E-5 |
The matched curve of frequency and capacitance is as shown in figure 19, and wherein B is data point.
According to seeking out current grain temperature lower sensor capacitor CCurrently(TGrain temperature) and calibration capacitance C after temperature adjustmemtCalibration
(TGrain temperature) after, the difference that the two is subtracted each other is the grain capacitor under Current Temperatures:
CGrain(TGrain temperature)=CCurrently(TGrain temperature)-CCalibration(TGrain temperature) (3)
Unit of capacity pF.
The working principle of the level sensor are as follows: air relative dielectric constant ε r is 1, and the dielectric constant of grain is much larger than
This value, therefore level sensor measurement range, whether there is or not grain, measured capacitance has significant difference, determines dryer with this
Grain material position situation in storehouse.The present invention uses single multi-point design, is encapsulated in flexible cable, and each sensor points are a material
Level sensor, each level sensor include a single-chip microcontroller, include multiple level sensors in every cable, each material position passes
It is communicated between sensor point using RS485 communication module.Every cable is vertically fixed in grain heat-drying cabin in lacing wire, is led to
Cross and measure each sensor position grain whether there is or not determining material position, can real time on-line monitoring, detect the state of buying securities with all one's capital in time.
In practical application, level sensor telecommunication system includes relay and relay sensor side interconnected, number
According to calculating and display end.Every foodstuff drying device has a relay, powers and inquires to sensor side downwards, upwards will sensing
Device data report to data calculating and display end.Relay includes power module, single-chip microcontroller, communication module.Power module will be outer
The direct current or 220Vac on boundary are converted to 5Vdc DC voltage, to itself and level sensor power supply.On relay is available
Row communication modes have RS485 and wireless telecommunications.Data calculate the data uploaded with display end by receiving relaying, are calculated and be shown
Current material position situation.
Level sensor surface of the present invention is smooth not to press from both sides powder, will not get rusty, zonal cooling measurement, measuring accuracy
Height, structure is simple, easy for installation, the influence of not material feeding chamber structure and installation environment, no movable member, while measurement temperature is added
Function, be suitable for wide popularization and application.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of capacitance sensor for detecting foodstuff drying device material position, which is characterized in that mainly include circuit board, metallic cable, phase
The anode that mutual capacitance incudes and the cathode positioned at positive two sides；
It is connected between the positive electrode and negative electrode by connector, the two sides of cathode pass through left fixing piece respectively, right fixing piece is fixed；
The metallic cable sequentially passes through left fixing piece, cathode, connector, anode, connector, cathode, right fixing piece；
The circuit board is located on left fixing piece or right fixing piece, is connected by conducting wire with anode, two cathode.
2. the capacitance sensor of detection foodstuff drying device material position according to claim 1, which is characterized in that the metallic cable
It is placed in the middle by the locked clip device on the left of left fixing piece and on the right side of right fixing piece.
3. it is according to claim 1 detection foodstuff drying device material position capacitance sensor, which is characterized in that it is described anode with
The material of cathode is stainless steel, is the identical coaxial cylinders of diameter.
4. it is according to claim 1 detection foodstuff drying device material position capacitance sensor, which is characterized in that it is described anode with
It is threadedly coupled between cathode by connector.
5. the capacitance sensor of detection foodstuff drying device material position according to claim 1, which is characterized in that the left fixation
The two sides of part, right fixing piece and cathode pass through interference fit connection.
6. the capacitance sensor of detection foodstuff drying device material position according to claim 1, which is characterized in that the left fixation
Part, right fixing piece include centrally located central through hole and several radially-arranged circular through holes of central through hole.
7. the capacitance sensor of detection foodstuff drying device material position according to claim 1, which is characterized in that the left fixation
Part, right fixing piece material be nylon, the material of the connector is polytetrafluoroethylene (PTFE).
8. the capacitance sensor of detection foodstuff drying device material position according to claim 1, which is characterized in that the circuit board
Including regulated power supply, single-chip microcontroller, the frequency detection module being connected with single-chip microcontroller, RS485 communication module；
The regulated power supply is logical for single-chip microcontroller, frequency detection module, RS485 for 5V input voltage to be converted to 3.3V power supply
Interrogate module for power supply；
The single-chip microcontroller is mainly used for receiving the external interrupt signal of frequency detection module to calculate input capacitance value and export；
Input end capacitor is changed using RC oscillation chip and establishes function pass with output square wave frequency by the frequency detection module
System；
The RS485 communication module, for the communication between multiple sensors in series.
9. the capacitance sensor of detection foodstuff drying device material position according to claim 8, which is characterized in that the circuit board
It further include the digital sensor being connected with single-chip microcontroller, the temperature for detection sensor.
10. the capacitance sensor of detection foodstuff drying device material position according to any one of claims 1 to 9, which is characterized in that
The shape of the capacitance sensor is cylinder, using single multi-point design, is encapsulated in flexible cable, is vertically fixed on grain
It dries in cabin in lacing wire.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649659A (en) * | 2020-05-19 | 2020-09-11 | 潘笑 | Hall sensor |
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- 2018-12-27 CN CN201811611635.XA patent/CN109579942A/en active Pending
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| CN2235113Y (en) * | 1995-07-28 | 1996-09-11 | 武汉科理技术开发公司 | Capacitance charge level limit switch |
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| CN1392396A (en) * | 2001-06-20 | 2003-01-22 | 威海海和科技有限责任公司 | Flexible quasi-sectional capacitance material level sensor |
| CN104535135A (en) * | 2015-01-22 | 2015-04-22 | 上海飞科电器股份有限公司 | Non-contact liquid level detection device and non-contact liquid level detection method |
| CN205607912U (en) * | 2016-05-17 | 2016-09-28 | 安徽博微长安信息科技有限公司 | Capacitanc moisture sensor and subassembly thereof |
| CN209148085U (en) * | 2018-12-27 | 2019-07-23 | 安徽博微长安电子有限公司 | Detect the capacitance sensor of foodstuff drying device material position |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649659A (en) * | 2020-05-19 | 2020-09-11 | 潘笑 | Hall sensor |
| CN111649659B (en) * | 2020-05-19 | 2021-12-07 | 惠州市盛德乐电子有限公司 | Hall sensor |
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