CN102590293A - Device for detecting moisture content of plates and sorting plates - Google Patents
Device for detecting moisture content of plates and sorting plates Download PDFInfo
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- CN102590293A CN102590293A CN2012100280605A CN201210028060A CN102590293A CN 102590293 A CN102590293 A CN 102590293A CN 2012100280605 A CN2012100280605 A CN 2012100280605A CN 201210028060 A CN201210028060 A CN 201210028060A CN 102590293 A CN102590293 A CN 102590293A
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Abstract
A device for detecting moisture content of plates and sorting plates belongs to the field of plate manufacture and aims at solving the problem that at present continuous online detecting of the moisture content under the condition of high moisture content can not be achieved. The device for detecting the moisture content of plates and sorting plates comprises a program logic controller (PLC), a plate state detecting unit, a plate moisture content detecting unit, a signal processor, a counter, an industrial personal computer, a driving circuit, a sorting kicking unit and a conveying mechanism unit. The plate state detecting unit detects whether the plates enter a detecting area, the plate moisture content detecting unit detects the moisture content of the plates, signals processed through the signal processor are transmitted to the PLC through the counter, the PLC controls the sorting kicking unit and the conveying mechanism unit to conduct sorting and conveying by driving the driving circuit, the PLC uploads data to an upper computer, and the upper computer controls setting of kicking threshold.
Description
Technical field
The present invention relates to online detection of a kind of sheet material water percentage and plate sorting devices, belong to the saw lumber field.
Background technology
The sheet material water percentage is one of important indicator that detects board quality, and physics, the mechanical property of sheet material had material impact, and the sheet material water percentage is the important evidence of sheet material being carried out sorting.Online detection of sheet material water percentage that water percentage, especially the saw lumber production line log of mensuration sheet material is processed into and sorting are the important technique measure of rationally utilizing sheet material, practicing thrift sheet material, are the important procedures in the saw lumber processing.The order of accuarcy of the online detection of sheet material water percentage directly influences follow-up sheet material dry quality, volume recovery, the production cost in drying and the process, production efficiency etc.; The robotization of realization saw lumber production line online detection of sheet material water percentage and sorting and visual; Be follow-up sheet material classification drying; Reach energy-saving and cost-reducing, improve dry mass and production efficiency is laid a good foundation; For reasonable, saving utilize the limited forest reserves of China, keep ecological balance, realize that sustainable development has very important significance.
At present, the measuring method that detects the sheet material water percentage is a lot, mainly contains weight method, electric-resistivity method, capacitance method, infra-red sepectrometry, rays method, supercritical ultrasonics technology etc., adopts electric-resistivity method in the actual production mostly.But electric-resistivity method is more accurate generally between 6%～30% the time, and when the sheet material water percentage surpassed 30%, electric conductivity changed very little, so can't be implemented in the water percentage continuous on-line detection under the high-moisture percentage.
Summary of the invention
The present invention seeks to provides online detection of a kind of sheet material water percentage and plate sorting devices in order to solve the problem of the sheet material water percentage continuous on-line detection that can't be implemented at present under the high-moisture percentage.
Online detection of a kind of sheet material water percentage according to the invention and plate sorting devices; It comprises PLC controller, sheet material state detection unit, sheet material water percentage detecting unit, signal processor, counter, industrial computer, driving circuit, sorting kicking unit and connecting gear unit
The sheet material of sheet material state detection unit gets into the detection zone signal output part and links to each other with the sheet material entering detection zone signal input part of PLC controller;
The sheet material water percentage signal output part of sheet material water percentage detecting unit links to each other with the input end of signal processor, and the output terminal of signal processor links to each other with the input end of counter, and the output terminal of counter links to each other with the sheet material water percentage signal input part of PLC controller;
The sorting order output terminal of PLC controller links to each other with the input end of driving circuit, and the sorting signals output terminal of driving circuit links to each other with the input end of sorting kicking unit, and the transmission order output terminal of driving circuit links to each other with the input end of connecting gear unit;
The data input/output terminal of PLC controller links to each other with the input/output terminal of industrial computer.
Advantage of the present invention:
Sheet material water content on-line testing device according to the invention is to efficiently solve the principal element that influences the sheet material water percentage---the one-to-one relationship between the specific inductive capacity sheet material water percentage of sheet material.Overcome electric-resistivity method and can only be used for the sheet material water percentage in limitation below 30% and the defective that can not carry out online contactless detection to sheet material.It is to detect core that the present invention adopts single planar capacitance sensor; In conjunction with PLC S7-200 as main control unit; Realized the high-moisture percentage sheet material of water percentage more than fibre saturated point is carried out online detection,, improved production efficiency for follow-up sheet material drying has reduced production cost; Help saving energy and reduce the cost in the production run, improved the dry mass and the volume recovery of sheet material.
Description of drawings
Fig. 1 is the structural representation of sheet material water content on-line testing device according to the invention.
Embodiment
Embodiment one: this embodiment is described below in conjunction with Fig. 1; Online detection of said a kind of sheet material water percentage of this embodiment and plate sorting devices; It comprises PLC controller 1, sheet material state detection unit 2, sheet material water percentage detecting unit 3, signal processor 4, counter 5, industrial computer 8, driving circuit 9, sorting kicking unit 10 and connecting gear unit 11
The sheet material of sheet material state detection unit 2 gets into the detection zone signal output part and links to each other with the sheet material entering detection zone signal input part of PLC controller 1;
The sheet material water percentage signal output part of sheet material water percentage detecting unit 3 links to each other with the input end of signal processor 4; The output terminal of signal processor 4 links to each other with the input end of counter 5, and the output terminal of counter 5 links to each other with the sheet material water percentage signal input part of PLC controller 1;
The sorting order output terminal of PLC controller 1 links to each other with the input end of driving circuit 9, and the sorting signals output terminal of driving circuit 9 links to each other with the input end of sorting kicking unit 10, and the transmission order output terminal of driving circuit 9 links to each other with the input end of connecting gear unit 11;
The data input/output terminal of PLC controller 1 links to each other with the input/output terminal of industrial computer 8.
PLC controller 1 selection model is that the controller of PLC S7-200 is realized.
Sheet material state detection unit 2 adopts the E3Z-R61 of Omron Corp type photoelectric sensor to realize.
Sheet material water percentage detecting unit 3 adopts single planar capacitance sensor to realize.
Signal processor 4 adopts the AD654 voltage-frequency converter to realize that the model of counter 5 is HSC1, and signal processor 4 sum counters 5 are the expanding element of PLC controller 1.
Whether sheet material state detection unit 2 is used to detect sheet material online, differentiates sheet material whether in detection zone.When sheet material entering detection zone, the output state of photoelectric sensor becomes 0 by 1, and sheet material water percentage detecting unit 3 begins to detect the water percentage of sheet material at this moment; When sheet material leaves detection zone, photoelectric sensor output becomes 1, sheet material water percentage detecting unit 3 detection of end by 0.The light source of this photoelectric sensor adopts red light emitting diodes as detecting light, and principle of work is similar with the LED displacement transducer.Detect distance and can reach 400mm, maximum response time 1ms.Through its with cable, detection signal can directly be imported the I/O end of main control unit PLC S7-200, by the PLC query State, gets into detection zone thereby test the sheet material test specimen exactly, operates in the detection zone and three kinds of states that leave detection zone.
Sheet material water percentage detecting unit 3 is used to detect the sheet material water percentage, is the core of whole detection device.Its principle is that the specific inductive capacity of sheet material under certain conditions can be only definite by its water percentage; And the corresponding relation of specific inductive capacity and water percentage also is one to one; So when other condition does not change; Can utilize single planar capacitance sensor to measure the specific inductive capacity of sheet material earlier, obtain the water percentage of sheet material again according to the corresponding relation of specific inductive capacity and water percentage.
Single planar capacitance sensor produces a two-frequency electromagnetic field, when tested sheet material is surperficial through sensor single plane electrode top, causes the variation of sensor capacitance, changes according to this that records, and can calculate the water percentage of tested sheet material.This sensor is contactless fully with tested sheet material in when work, and requirement sheet material will pass through in sensor upper outside surfaces 30mm distance during work, this sensor can guarantee efficiently, at a high speed, sheet material measurement water percentage contactlessly continuously.
What the single plane capacitor sensor produced is voltage signal, can not be by PLC controller 1 Direct Recognition.So need to convert voltage signal to pulse duration frequency signal that PLC controller 1 can be discerned through counter 5.
The sheet material that sorting kicking unit 10 will have the same sector water percentage sorts out, for the classification drying of next step sheet material lays the foundation.
The connecting gear unit 11 of sheet material adopts AC motor as power source, drives travelling belt, carries sheet material.The speed of feed of travelling belt is controlled through frequency control.
The function of signal processing unit 4 is that the signal to sheet material water percentage detecting unit 3 output amplifies, the voltage-frequency conversion; Analyze through PLC controller 1 then; Send control signal; Behind driving circuit 9, executive component is moved control, said executive component comprises the executive component of sorting kicking unit 10 and the executive component AC motor of connecting gear unit 11.
PLC controller 1 as slave computer in this embodiment adopts PLC S7-200; Major function is to be responsible for the collection water percentage signal of field high-speed data; Realize logic, regularly, function such as contrast, transmit PLC duty and relevant data through serial communication interface to industrial computer 8 and computing machine, industrial computer 8 receives instruction simultaneously; Send instruction to driving circuit 9 and peripherals, the action of control separation system.
PLC S7-200 has expanded the AD654V/F voltage-frequency converter, a high-speed counter HSC 1 and a multifunctional communication unit.What the single plane capacitor sensor produced is voltage signal, can not be by PLC controller 1 Direct Recognition.So need to convert voltage signal to pulse duration frequency signal that high-speed counter can be discerned.A kind of low cost that adopts ADI to produce in this embodiment; The electric voltage frequency V/F converter AD654 of 8 pin encapsulation; It is made up of low drift input amplifying circuit, precision oscillator system and out drive stage, only needs a RC network during use, can constitute application circuit.AD654 both can use single power supply, also can use dual power supply, and operating voltage range is very wide.Be output as frequency controlled square wave in input voltage.Can be used for signal source, signal modulation, separate mediation A/D conversion etc.The signal of single planar capacitance sensor emission can directly be transferred to and be carried out control and treatment in the high-speed counter 5, and be kept in the storage element of appointment after converting pulse duration frequency signal into through voltage-frequency, waits to be calculated calling.Host computer adopts computing machine that the data that PLC gathered are shown in real time and the sorting kick is set; And carry out serial communication through the RS-485 communications protocol; Handled easily person makes amendment to technological parameter under the situation of not changing the PLC program, thereby realizes the man-machine communication.
The various signals of 8 pairs of collections of industrial computer carry out analyzing and processing and reality output.Adopt PLC S7-200 as the core that detects control,, simultaneously, transmit data through the RS485 communications protocol to computing machine (host computer), to treat further processing.
The major function of computing machine (host computer) is monitoring, demonstration, prints, changes and played threshold parameter.
Played the rule that is provided with of threshold value: concrete threshold value will be set according to the seeds of sheet material, and it is also different that the quilt that different seeds set is played threshold value.For example, the employing seeds are Korean pine, and being played threshold setting is 45%, and the sheet material water percentage is kicked out of more than or equal to 45%, sees windrow off through travelling belt, and the underproof sheet material of this water percentage is eliminated; If the sheet material water percentage is lower than at 45% o'clock, through, sorting kicking unit 10 falls, and delivers to next travelling belt to sheet material by the heap classification.
Sorting kicking unit 10 has the function that the sheet material with water percentage in the certain limit sorts out; Be that sheet material is divided into many heaps, the water percentage of every heap sheet material is more or less the same, and generally differing 15% with water percentage is the boundary; The heap of classifying is hided; The example water percentage is assigned to a pile at 0%～15% sheet material, and water percentage is that 15%～30% sheet material is divided into a pile, for the classification drying of next step sheet material lays the foundation.Played the sheet material that falls and can further be carried out secondary sorting or three sortings, method for separating with above-mentioned first time sorting schemes identical, repeat no more here.
Played threshold value and divide the rule of heap to carry out real time modifying according to the not equal actual conditions of seeds by computing machine (host computer).
Embodiment two: this embodiment further specifies embodiment one, and it also comprises display screen 6, and the demonstration output terminal of PLC controller 1 links to each other with the input end of display screen 6.Display screen 6 is used to show the water percentage data of sheet material presence and sheet material.
Embodiment three: this embodiment further specifies embodiment one, and it also comprises storer 7, and the storage output terminal of PLC controller 1 links to each other with the input end of storer 7.Storer 7 is used to store the water percentage data of sheet material.
Claims (7)
1. online detection of sheet material water percentage and plate sorting devices; It is characterized in that; It comprises PLC controller (1), sheet material state detection unit (2), sheet material water percentage detecting unit (3), signal processor (4), counter (5), industrial computer (8), driving circuit (9), sorting kicking unit (10) and connecting gear unit (11)
The sheet material of sheet material state detection unit (2) gets into the detection zone signal output part and links to each other with the sheet material entering detection zone signal input part of PLC controller (1);
The sheet material water percentage signal output part of sheet material water percentage detecting unit (3) links to each other with the input end of signal processor (4); The output terminal of signal processor (4) links to each other with the input end of counter (5), and the output terminal of counter (5) links to each other with the sheet material water percentage signal input part of PLC controller (1);
The sorting order output terminal of PLC controller (1) links to each other with the input end of driving circuit (9); The sorting signals output terminal of driving circuit (9) links to each other with the input end of sorting kicking unit (10), and the transmission order output terminal of driving circuit (9) links to each other with the input end of connecting gear unit (11);
The data input/output terminal of PLC controller (1) links to each other with the input/output terminal of industrial computer (8).
2. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices, it is characterized in that it also comprises display screen (6), the demonstration output terminal of PLC controller (1) links to each other with the input end of display screen (6).
3. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices, it is characterized in that it also comprises storer (7), the storage output terminal of PLC controller (1) links to each other with the input end of storer (7).
4. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices, it is characterized in that PLC controller (1) selection model is that the controller of PLC S7-200 is realized.
5. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices, it is characterized in that sheet material state detection unit (2) adopts the E3Z-R61 of Omron Corp type photoelectric sensor to realize.
6. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices, it is characterized in that sheet material water percentage detecting unit (3) adopts single planar capacitance sensor to realize.
7. according to claim 1 online detection of said a kind of sheet material water percentage and plate sorting devices; It is characterized in that; Signal processor (4) adopts the AD654 voltage-frequency converter to realize; The model of counter (5) is HSC1, and signal processor (4) sum counter (5) is the expanding element of PLC controller (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100280605A CN102590293A (en) | 2012-02-07 | 2012-02-07 | Device for detecting moisture content of plates and sorting plates |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100280605A CN102590293A (en) | 2012-02-07 | 2012-02-07 | Device for detecting moisture content of plates and sorting plates |
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| CN102590293A true CN102590293A (en) | 2012-07-18 |
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| CN2012100280605A Pending CN102590293A (en) | 2012-02-07 | 2012-02-07 | Device for detecting moisture content of plates and sorting plates |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104555477A (en) * | 2013-10-17 | 2015-04-29 | 航天信息股份有限公司 | Automatic grain warehousing system and automatic grain warehousing method |
| CN104670839A (en) * | 2013-11-29 | 2015-06-03 | 航天信息股份有限公司 | Material conveying device |
| CN105032779A (en) * | 2015-07-15 | 2015-11-11 | 大连理工大学 | Accurate fishery organism detecting, counting and grading device |
| CN107014836A (en) * | 2017-05-19 | 2017-08-04 | 四川莱源科技有限公司 | The method that moisture is measured using microwave technology |
| CN111906042A (en) * | 2020-06-03 | 2020-11-10 | 安徽钜将家具制造有限公司 | Timber moisture content detection device for furniture production |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104555477A (en) * | 2013-10-17 | 2015-04-29 | 航天信息股份有限公司 | Automatic grain warehousing system and automatic grain warehousing method |
| CN104555477B (en) * | 2013-10-17 | 2017-05-10 | 航天信息股份有限公司 | Automatic grain warehousing system and automatic grain warehousing method |
| CN104670839A (en) * | 2013-11-29 | 2015-06-03 | 航天信息股份有限公司 | Material conveying device |
| CN105032779A (en) * | 2015-07-15 | 2015-11-11 | 大连理工大学 | Accurate fishery organism detecting, counting and grading device |
| CN107014836A (en) * | 2017-05-19 | 2017-08-04 | 四川莱源科技有限公司 | The method that moisture is measured using microwave technology |
| CN111906042A (en) * | 2020-06-03 | 2020-11-10 | 安徽钜将家具制造有限公司 | Timber moisture content detection device for furniture production |
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