CN207689411U - A kind of plastic grain moisture transducer - Google Patents
A kind of plastic grain moisture transducer Download PDFInfo
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- CN207689411U CN207689411U CN201820117118.6U CN201820117118U CN207689411U CN 207689411 U CN207689411 U CN 207689411U CN 201820117118 U CN201820117118 U CN 201820117118U CN 207689411 U CN207689411 U CN 207689411U
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Abstract
The utility model discloses a kind of plastic grain moisture transducers, including：Signal transmitter unit comprising transmitter plate and square-wave generator；Signal gathering unit is connect with the transmitting terminal of the square-wave generator；Signal conversion unit, input terminal are connect with the signal output end of the signal gathering unit；Signal processing unit, it includes detecting circuit, operational amplification circuit and controlled constant-current source circuit, the input terminal of detecting circuit and the output end of signal conversion unit connect, the input terminal of operational amplification circuit and the output end of detecting circuit connect, and the output end of operational amplification circuit and the input terminal of controlled constant-current source circuit connect.Plastic grain moisture transducer provided by the utility model overcomes the interference of external device, and ac voltage signal caused by plastic grain moisture is changed into d. c. voltage signal by detection techniques, and realize current signal output, it can determine the water content of plastics by current value, it is simple in structure, simple to operation, at low cost.
Description
Technical field
The utility model is related to sensor technical fields, and more specifically, the utility model is related to a kind of to plastic grain
The plastic grain moisture transducer that is detected of moisture.
Background technology
Plastic grain is the raw material of many production plastic products and processing enterprise, needs to detect supplied materials when producing product
Moisture, the adjustment produced by moisture data so as to technology and production division.Workshop is by taking feasible measure
And scheme, produce the product for meeting national standard and requirement.The water content of plastic grain is in 0.03%-0.5% ranges, difference
Plastic particles raw materials water content be also not quite similar.Currently, being looked forward to plastic products and processing using plastic grains moisture teller
The raw material of industry carries out moisture measurement, but complicated for operation, and cost is higher, and reliability is not good enough, and can not achieve online monitoring method, unfavorable
In promoting the use of.Domestic industry is caused with automobile making to be prominent example, Shooting Technique level is unable to catch up with external first intaking always
It is flat.Traditional weighing measurement method measures the moisture of plastic grain and lacks there is the precision of measurement and accuracy are undesirable
It falls into, cannot satisfy the use demand.
Utility model content
One purpose of the utility model is to solve at least the above, and provide the advantages of at least will be described later.
There are one purposes for the utility model there is provided a kind of plastic grain moisture transducer, novelty simple in structure,
It is easy to operate, it is of low cost, external interference can be effectively avoided, ensure that the accuracy of plastic grain moisture measurement.
To achieve the goals above, the utility model provides a kind of plastic grain moisture transducer, including：
Signal transmitter unit comprising transmitter plate and the square-wave generator being placed on the transmitter plate；
Signal gathering unit is connect with the transmitting terminal of the square-wave generator, and the signal of the signal gathering unit
Collection terminal is for contacting plastic grain；
Signal conversion unit, input terminal are connect with the signal output end of the signal gathering unit；
Signal processing unit is placed on the transmitter plate, and the signal processing unit includes that detecting circuit, operation are put
Big circuit and controlled constant-current source circuit, the input terminal of the detecting circuit are connect with the output end of the signal conversion unit,
The input terminal of the operational amplification circuit is connect with the output end of the detecting circuit, the output end of the operational amplification circuit with
The input terminal of the controlled constant-current source circuit connects.
Preferably, the plastic grain moisture transducer, the signal gathering unit include occurring with the square wave
The preceding segment electrode of the transmitting terminal connection of device and what is connect with the preceding segment electrode second be dielectrically separated from section.
Preferably, the plastic grain moisture transducer, the signal conversion unit include：
It plans resistance, is connected in parallel with the preceding segment electrode；
Segment electrode afterwards, the output end for being dielectrically separated from section with described second are connect；
Ground resistance is connected in parallel with the rear segment electrode.
Preferably, the plastic grain moisture transducer further includes：
Transmitter box is used to house the transmitter plate, and with output line interface；
Signal output line is connect with the output end of the controlled constant-current source circuit, and across the output line interface with
Extend the transmitter box；
Connecting flange is detachably secured to the lateral wall of the transmitter box；
Stainless steel connecting tube, one end are connect with the connecting flange；
First screwed pipe, part are embedded in the cavity of the stainless steel connecting tube from the other end of the stainless steel connecting tube
It is interior；
First is dielectrically separated from section, and one end is threadedly coupled with the remainder of first screwed pipe；
Second screwed pipe, the other end that part is dielectrically separated from section from described first are embedded in described first and are dielectrically separated from section
In cavity, the remainder of second screwed pipe is connect with the threaded one end of the rear segment electrode；
Third screwed pipe, is partially submerged into the other end of the rear segment electrode, and remainder is dielectrically separated from described second
One end connection of section；
4th screwed pipe, the other end that part is dielectrically separated from section from described second are embedded in described second and are dielectrically separated from section
In cavity, the remainder of the 4th screwed pipe is connect with the preceding segment electrode, the preceding segment electrode and the 4th screw thread
One end that pipe is connected opens up the channel that the oriented other end extends；
Riffled tube is placed in described second and is dielectrically separated from section, and respectively with the third screwed pipe and the described 4th
Screwed pipe connects；
Wherein, the position that the lateral wall of the transmitter box is connect with the connecting flange offers through hole, and described
The cavity of the channel of preceding segment electrode and the stainless steel connecting tube, the cavity of first screwed pipe, described first are dielectrically separated from
The cavity of section, the cavity of second screwed pipe, it is described after the cavity of segment electrode, the cavity of the third screwed pipe, described the
Two cavitys for being dielectrically separated from the cavity of section, the cavity of the riffled tube and the 4th screwed pipe form a wire casing after being connected to
Channel, be equipped in the wire casing channel be respectively used to connect it is described after segment electrode with the transmitter plate and for described in connecting
The electrode connecting line of preceding segment electrode and the transmitter plate.
Preferably, the plastic grain moisture transducer, first screwed pipe are connected to ground connection zero curve.
Preferably, the plastic grain moisture transducer, described first be dielectrically separated from section with it is described second insulation every
It is identical from the length of section.
The utility model includes at least following advantageous effect：
1, plastic grain moisture transducer provided by the utility model by square-wave generator, preceding segment electrode, rear segment electrode,
The combination for planning resistance, ground resistance and detecting circuit realizes produced by the water content for exporting plastic grain to be measured
Current value, and show that the water content of plastic grain is calculated in current value by Current Display, ensure that measurement result
Accuracy.
2, plastic grain moisture transducer provided by the utility model is dielectrically separated from section by first, second is dielectrically separated from section
And ground connection setting avoids the interference of outer bound pair equipment, ensure that the accuracy of measurement result.
3, plastic grain moisture transducer provided by the utility model it is simple in structure and novel, it is convenient for installation and maintenance, operation
It is simple and direct, of low cost, easy to carry, safeguard simple, good reliability, convenient for promoting the use of, filled up the blank of industry.
4, plastic grain moisture transducer high certainty of measurement provided by the utility model, fast response time, data transmission effect
Rate height, can ensure to work normally dependable performance, be suitable for substituting traditional weighing method, using simplicity.
Part is illustrated to embody by the further advantage, target and feature of the utility model by following, and part will also pass through
Research and practice to the utility model and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the structural schematic diagram of plastic grain moisture transducer described in the utility model.
Fig. 2 is the internal structure schematic diagram of plastic grain moisture transducer described in the utility model.
Fig. 3 is the inside cabling schematic diagram of plastic grain moisture transducer described in the utility model.
Fig. 4 is the circuit diagram of plastic grain moisture transducer described in the utility model.
Specific implementation mode
Below in conjunction with the accompanying drawings and embodiment is described in further detail the utility model, to enable people in the art
Member can implement according to this with reference to specification word.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not precluded one or more
The presence or addition of a other elements or combinations thereof.
As shown in Figure 1 to 4, the utility model discloses a kind of plastic grain moisture transducers, including：
Signal transmitter unit comprising transmitter plate 4 and the square-wave generator being placed on the transmitter plate 4；
Signal gathering unit is connect with the transmitting terminal of the square-wave generator, and the signal of the signal gathering unit
Collection terminal is for contacting plastic grain；
Signal conversion unit, input terminal are connect with the signal output end of the signal gathering unit；
Signal processing unit is placed on the transmitter plate 4, and the signal processing unit includes detecting circuit, operation
Amplifying circuit and controlled constant-current source circuit, the input terminal of the detecting circuit and the output end of the signal conversion unit connect
It connects, the input terminal of the operational amplification circuit is connect with the output end of the detecting circuit, the output of the operational amplification circuit
End is connect with the input terminal of the controlled constant-current source circuit.
Wherein, signal gathering unit include the preceding segment electrode 15 being connect with the transmitting terminal of the square-wave generator and with it is described
The second of the connection of preceding segment electrode 15 is dielectrically separated from section 13.
Signal conversion unit includes：It plans resistance, is connected in parallel with the preceding segment electrode 15；Segment electrode 11 afterwards, with
Described second is dielectrically separated from the output end connection of section 13；Ground resistance is connected in parallel with the rear segment electrode 11.
Square-wave generator is for emitting working signal and sending constant voltage signal to plastics；Preceding segment electrode 15 and second insulation every
From section 13 for receiving the working signal and acquiring reflection signal；Signal conversion unit is for converting the reflection signal to
Ac voltage signal；Detecting circuit is for receiving the ac voltage signal and being processed into d. c. voltage signal；Operation is put
Big circuit is for the d. c. voltage signal to be amplified；Controlled constant-current source circuit is used for amplified d. c. voltage signal
Be converted to standard analog current signal and 485 signals and export.And by the current value of display device display transmission, it is specified that electricity
Ranging from 4~20mA of flow valuve.
The utility model is using the water content of plastic grain sample and output current value as standard, and square-wave generator is by generation
The plastic grain of segment electrode contact before constant voltage signal is transferred to, when detecting the plastic grain of different moisture content, due to plastics
The moisture variation of grain causes conductivity to change, preceding segment electrode 15 by the ac current signal of collected plastic grain, with
The planning resistance in parallel of preceding segment electrode 15 ensures common mode input signal reference potential, and the signal after benchmark is fed back to and back segment
The ground resistance in parallel of electrode 11, ground resistance feed back to detecting circuit, detecting circuit after being transformed into ac voltage signal
Ac voltage signal is processed into d. c. voltage signal, after amplifying using operational amplification circuit high magnification numbe, through voltage controlled current source
Circuit output current signal, and by the current value of display device display transmission, it is specified that ranging from 4~20mA of current value.
The current value of the sensor measurement of the utility model and it is than the relationship between moisture content again：
Again than moisture content (W)=(A-4.7)/32%A- measured current values.
As a best embodiment of the utility model, plastic grain moisture transducer provided by the utility model,
Further include：
Transmitter box 1 is used to house transmitter plate 4, and with output line interface 3；
Signal output line 5 is connect with the controlled constant-current source circuit, and across the output line interface 3 to extend
The transmitter box 1；
Connecting flange 6 is detachably secured to the lateral wall of the transmitter box 1；
Stainless steel connecting tube 7, one end are connect with the connecting flange 6；
First screwed pipe 8, part are embedded in the stainless steel connecting tube 7 from the other end of the stainless steel connecting tube 7
In cavity；
First is dielectrically separated from section 9, and one end is threadedly coupled with the remainder of first screwed pipe 8；
Second screwed pipe 10, the other end insertion described first that part is dielectrically separated from section 9 from described first are dielectrically separated from
In the cavity of section 9, the remainder of the second screwed pipe 10 is threadedly coupled with rear segment electrode 11；
Third screwed pipe 12 is partially submerged into the other end of the rear segment electrode 11；Second be dielectrically separated from one end of section with
The remainder of the third screwed pipe 12 is threadedly coupled；
4th screwed pipe 14, the other end insertion described second that part is dielectrically separated from section 13 from described second are dielectrically separated from
In the cavity of section 13, the remainder of the 4th screwed pipe 14 is threadedly coupled with preceding segment electrode 15, preceding segment electrode 15 and the 4th screw thread
One end that pipe 14 connects opens up the channel that the oriented other end extends；
Riffled tube 16 is placed in described second and is dielectrically separated from section 13, and respectively with the third screwed pipe 12 and institute
State the connection of the 4th screwed pipe 14；
Wherein, the position that the lateral wall of the transmitter box 1 is connect with the connecting flange 6 offers through hole, and institute
State the channel of preceding segment electrode 15 and the cavity of the stainless steel connecting tube 7, the cavity of first screwed pipe 8, described first absolutely
The cavity of edge distance piece 9, the cavity of second screwed pipe 10, the cavity of the rear segment electrode 11, the third screwed pipe 12
Cavity, described second be dielectrically separated from the cavity of section 13, the cavity of the riffled tube 16 and the 4th screwed pipe 14
Cavity connection after form a wire casing channel 20, be equipped in the wire casing channel 20 for connect it is described after segment electrode 11 with it is described
Transmitter plate 4 and electrode connecting line 18 for connecting the preceding segment electrode 15 and the transmitter plate 4.
Also, the first screwed pipe 8 is connected to conducting wire 19 and is connected in 220v exchange the earth.First is dielectrically separated from section 9 and second absolutely
The length of edge distance piece 13 is identical.
Plastic grain moisture transducer in the utility model has remarkable temperature tolerance, moisture-proof, can be in -20-200
Within the scope of DEG C wider temperature, ensure high-precision, high stability, superior repeatability.It is widest be applied to modeling grain material/
Medium again than the on-line checking of moisture content.And ensure that moulding grain object feed-weight ratio moisture content outputting standard in saturation range linearizes
Signal.It can be widely used for carrying out moisture measurement to colloid material or non-porous material, and can be water to multi-level material
Divide and measures.It is especially widely used to plastics moisture measurement.For these industries product drying, storage etc. productions activity it is aqueous
Rate on-line measurement all plays an important role and advantage.
The measurement accuracy of the plastic grain moisture transducer of the utility model is ± 0.02%, the response time<1 second.
It is not only in the description and the implementation although the embodiments of the present invention have been disclosed as above
Listed utilization, it can be applied to various fields suitable for the present invention completely, for those skilled in the art,
Other modifications may be easily implemented, therefore without departing from the general concept defined in the claims and the equivalent scope, this reality
It is not limited to specific details and legend shown and described herein with novel.
Claims (6)
1. a kind of plastic grain moisture transducer, which is characterized in that including：
Signal transmitter unit comprising transmitter plate and the square-wave generator being placed on the transmitter plate；
Signal gathering unit is connect with the transmitting terminal of the square-wave generator, and the signal acquisition of the signal gathering unit
End is for contacting plastic grain；
Signal conversion unit, input terminal are connect with the signal output end of the signal gathering unit；
Signal processing unit is placed on the transmitter plate, and the signal processing unit includes detecting circuit, operation amplifier electricity
Road and controlled constant-current source circuit, the input terminal of the detecting circuit is connect with the output end of the signal conversion unit, described
The input terminal of operational amplification circuit is connect with the output end of the detecting circuit, the output end of the operational amplification circuit with it is described
The input terminal of controlled constant-current source circuit connects.
2. a kind of plastic grain moisture transducer according to claim 1, which is characterized in that the signal gathering unit packet
Second for including the preceding segment electrode being connect with the transmitting terminal of the square-wave generator and being connect with the preceding segment electrode is dielectrically separated from section.
3. a kind of plastic grain moisture transducer according to claim 2, which is characterized in that the signal conversion unit packet
It includes：
It plans resistance, is connected in parallel with the preceding segment electrode；
Segment electrode afterwards, the output end for being dielectrically separated from section with described second are connect；
Ground resistance is connected in parallel with the rear segment electrode.
4. a kind of plastic grain moisture transducer according to claim 3, which is characterized in that further include：
Transmitter box is used to house the transmitter plate, and with output line interface；
Signal output line is connect with the output end of the controlled constant-current source circuit, and across the output line interface to extend
Go out the transmitter box；
Connecting flange is detachably secured to the lateral wall of the transmitter box；
Stainless steel connecting tube, one end are connect with the connecting flange；
First screwed pipe, part is out of, the other end of the stainless steel connecting tube is embedded in the stainless steel connecting tube cavity；
First is dielectrically separated from section, and one end is threadedly coupled with the remainder of first screwed pipe；
Second screwed pipe, the other end that part is dielectrically separated from section from described first are embedded in the described first cavity for being dielectrically separated from section
Interior, the remainder of second screwed pipe is connect with the threaded one end of the rear segment electrode；
Third screwed pipe is partially submerged into the other end of the rear segment electrode, and remainder and described second is dielectrically separated from section
Threaded one end connection；
4th screwed pipe, the other end that part is dielectrically separated from section from described second are embedded in the described second cavity for being dielectrically separated from section
Interior, the remainder of the 4th screwed pipe is connect with the preceding segment electrode, the preceding segment electrode and the 4th screwed pipe phase
One end of connection opens up the channel that the oriented other end extends；
Riffled tube is placed in described second and is dielectrically separated from section, and respectively with the third screwed pipe and the 4th screw thread
Pipe connects；
Wherein, the position that the lateral wall of the transmitter box is connect with the connecting flange offers through hole, and the leading portion
The cavity of the channel of electrode and the stainless steel connecting tube, the cavity of first screwed pipe, described first are dielectrically separated from section
Cavity, the cavity of second screwed pipe, the cavity of the rear segment electrode, the cavity of the third screwed pipe, described second are absolutely
It is logical that a wire casing is formed after the cavity connection of the cavity of edge distance piece, the cavity of the riffled tube and the 4th screwed pipe
Road, be equipped in the wire casing channel be respectively used to connect it is described after segment electrode with the transmitter plate and for connect it is described before
The electrode connecting line of segment electrode and the transmitter plate.
5. a kind of plastic grain moisture transducer according to claim 4, which is characterized in that first screwed pipe is connected to
It is grounded zero curve.
6. a kind of plastic grain moisture transducer according to claim 4, which is characterized in that described first is dielectrically separated from section
It is identical it to be dielectrically separated from the length of section with described second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117118.6U CN207689411U (en) | 2018-01-23 | 2018-01-23 | A kind of plastic grain moisture transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117118.6U CN207689411U (en) | 2018-01-23 | 2018-01-23 | A kind of plastic grain moisture transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207689411U true CN207689411U (en) | 2018-08-03 |
Family
ID=62990373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820117118.6U Active CN207689411U (en) | 2018-01-23 | 2018-01-23 | A kind of plastic grain moisture transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207689411U (en) |
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2018
- 2018-01-23 CN CN201820117118.6U patent/CN207689411U/en active Active
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