CN202421117U - On-line moisture content detection device for plates - Google Patents
On-line moisture content detection device for plates Download PDFInfo
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- CN202421117U CN202421117U CN2012200412686U CN201220041268U CN202421117U CN 202421117 U CN202421117 U CN 202421117U CN 2012200412686 U CN2012200412686 U CN 2012200412686U CN 201220041268 U CN201220041268 U CN 201220041268U CN 202421117 U CN202421117 U CN 202421117U
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- sheet material
- material water
- moisture content
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Abstract
The utility model discloses an on-line moisture content detection device for plates, and belongs to the field of material manufacturing, in order to solve the problem that the continuous on-line moisture content detection for plates with high moisture content cannot be implemented at present. The on-line moisture content detection device for plates provided by the utility model comprises a PLC (programmable logic controller), a photoelectric sensor, a single plane capacitor sensor, a signal processor and a counter; a 'plate-enters-detection area' signal output end of the photoelectric sensor and a 'plate-enters-detection area' signal input end of the PLC are connected; a plate moisture content signal output end of the single plane capacitor sensor is connected with an input end of the signal processor; an output end of the signal processor is connected with an input end of the counter; and an output end of the counter is connected with a plate moisture content signal input end of the PLC. The on-line moisture content detection device for plates provided by the utility model is used for detecting the moisture contents of plates on line.
Description
Technical field
The utility model relates to a kind of sheet material water content on-line testing device, belongs 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 utility model purpose is 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, a kind of sheet material water content on-line testing device to be provided.
The said a kind of sheet material water content on-line testing device of the utility model, it comprises PLC controller, photoelectric sensor, single planar capacitance sensor, signal processor sum counter,
The sheet material of photoelectric sensor 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 single planar capacitance sensor 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 advantage of the utility model:
The said sheet material water content on-line testing device of the utility model 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.The utility model adopts single planar capacitance sensor for detecting core; 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 the said sheet material water content on-line testing device of the utility model.
Embodiment
Embodiment one: below in conjunction with Fig. 1 this embodiment is described, the said a kind of sheet material water content on-line testing device of this embodiment, it comprises PLC controller 1, photoelectric sensor 2, single planar capacitance sensor 3, signal processor 4 sum counters 5,
The sheet material of photoelectric sensor 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 single planar capacitance sensor 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.
PLC controller 1 selection model is that the controller of PLC S7-200 is realized.
Photoelectric sensor 2 adopts the E3Z-R61 of Omron Corp type photoelectric sensor to realize.
Signal processor 4 adopts the AD654 voltage-frequency converter to realize.
Whether photoelectric sensor 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 2 becomes 0 by 1, and this moment, single planar capacitance sensor 3 began to detect the water percentage of sheet material; When sheet material leaves detection zone, photoelectric sensor 2 outputs become 1, single planar capacitance sensor 3 detection of end by 0.
Single planar capacitance sensor 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 3 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 3 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.
The function of signal processing unit 4 is that the signal to single planar capacitance sensor 3 output amplifies, the voltage-frequency conversion.
What single plane capacitor sensor 3 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.
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 (6)
1. a sheet material water content on-line testing device is characterized in that, it comprises PLC controller (1), photoelectric sensor (2), single planar capacitance sensor (3), signal processor (4) sum counter (5),
The sheet material of photoelectric sensor (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 single planar capacitance sensor (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).
2. according to the said a kind of sheet material water content on-line testing device of claim 1, 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 the said a kind of sheet material water content on-line testing device of claim 1, 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 the said a kind of sheet material water content on-line testing device of claim 1, it is characterized in that PLC controller (1) selection model is that the controller of PLC S7-200 is realized.
5. according to the said a kind of sheet material water content on-line testing device of claim 1, it is characterized in that photoelectric sensor (2) adopts the E3Z-R61 of Omron Corp type photoelectric sensor to realize.
6. according to the said a kind of sheet material water content on-line testing device of claim 1, it is characterized in that signal processor (4) adopts the AD654 voltage-frequency converter to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200412686U CN202421117U (en) | 2012-02-07 | 2012-02-07 | On-line moisture content detection device for plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200412686U CN202421117U (en) | 2012-02-07 | 2012-02-07 | On-line moisture content detection device for plates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421117U true CN202421117U (en) | 2012-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200412686U Expired - Fee Related CN202421117U (en) | 2012-02-07 | 2012-02-07 | On-line moisture content detection device for plates |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202421117U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916971A (en) * | 2019-04-25 | 2019-06-21 | 云南中烟工业有限责任公司 | A kind of fast non-destructive detection method of the fresh tobacco leaves moisture based on capacitor |
| CN110208338A (en) * | 2019-07-15 | 2019-09-06 | 哈尔滨工业大学（深圳） | A kind of traction steel band non-destructive testing device and method based on micro- capacitor |
-
2012
- 2012-02-07 CN CN2012200412686U patent/CN202421117U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916971A (en) * | 2019-04-25 | 2019-06-21 | 云南中烟工业有限责任公司 | A kind of fast non-destructive detection method of the fresh tobacco leaves moisture based on capacitor |
| CN110208338A (en) * | 2019-07-15 | 2019-09-06 | 哈尔滨工业大学（深圳） | A kind of traction steel band non-destructive testing device and method based on micro- capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20150207 |
|
| EXPY | Termination of patent right or utility model |