CN101149370B - Timber drying stress detection device and method - Google Patents
Timber drying stress detection device and method Download PDFInfo
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- CN101149370B CN101149370B CN2007101445214A CN200710144521A CN101149370B CN 101149370 B CN101149370 B CN 101149370B CN 2007101445214 A CN2007101445214 A CN 2007101445214A CN 200710144521 A CN200710144521 A CN 200710144521A CN 101149370 B CN101149370 B CN 101149370B
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Abstract
Stress detection equipment and method in wood dryness process. It relates to a kind of wood detection equipment and method. Aim to the problem that the laminar section-cutting method, the hackle method, the tile bend method can not detect directly and continuously, and it can not fix quantify test directly, its test accuracy is hard to assure. The instrument is: the tension stress sensor is fixedin the clamp, the tension stress sensor links with the modules convertor, the modules convertor links with the computer; the method is: fixes the wood sample in the clamp and dries it, when the wood sample shrinks and distorts, it produces shrink stress because of being restrained, and inputs it in the modules convertor to convert into digital signals through the analog signals of the tension stress sensor, then inputs in the computer test the stress in the dry process of the wood sample updating and continuously. Using the instrument and method in this invention can test the shrink stress inthe dry process of the wood directly, updating and continuously.
Description
Technical field
The present invention relates to a kind of kind of wood detection equipment.
Background technology
Drying of wood stress is research and major parameter and the foundation of formulating the Wood drying technique benchmark, but because the polytrope of timber itself and complicacy have brought many difficulties and inconvenience for the test of drying of wood stress, cause up to the present, how to test drying of wood stress fast and accurately and be still a great problem that is perplexing the timber scientific worker.The fifties has proposed to measure method---the hierarchy slicing method of drying of wood stress the earliest by Mc.Millen, and this method principle is reliable, be convenient to the drying stress Strain Distribution rule of lumber thickness direction is analysed in depth; Subsequently, propose the interdigitated electrode structure method again, drying stress has been carried out qualitative examination, be mainly used in dry practice.Xi Weimao has proposed to measure with watt curved method the method for drying of wood stress in 1972.Recent two decades comes, and along with some new testing tools and technology are introduced drying of wood research field, has occurred some new drying of wood stress test methods again.Shaar has inquired into the possibility with acoustic-emission indirect monitoring high level stress.People such as Chang Jianmin have carried out the research of Non-contact Method for Measuring Drying Stresses of Wood on the basis of watt curved method, obtain preliminary achievement in research.In addition, people such as Willam has also inquired into by measuring the possibility that DIELECTRIC CONSTANTS OF WOOD is come indirect Estimation drying of wood stress; Perry utilization grid touch sensor has carried out on-line determination to drying of wood stress, this device can not only be quantitative the size that obtains compression stress, can also show the development and change of compressive stress mode with image from the monitor, but powerless to the mensuration of tension.
Although above method has been brought into play certain effect in research drying of wood stress and formulation drying process baseline process, also exist such or such deficiency.Hierarchy slicing method, interdigitated electrode structure method principle are fairly simple, grasp easily, but program are loaded down with trivial details, and measured value is discontinuous, and testing time is limited; And quantitatively directly all be difficult to be guaranteed on test and the measuring accuracy, especially these two kinds of methods all can not realize in good time online detection.The subject matter of watt curved method is how to revise the difference of test specimen warpage amount of deflection and actual conditions, and the online intensity of variation that receives, handles and show the test specimen amount of deflection easily how in good time.The acoustic emission method research in drying of wood field abroad is many, but is a kind of very indirect measuring method strictly speaking, and it measures on-line continuous or infers that drying of wood stress becomes possibility, but technology is still immature, still is in the exploratory stage.
In addition, the method of utilizing water percentage monitoring timber drying that generally adopts for a long time is mainly to carry out according to the drying process benchmark of being set up between the drying stress of test determination and the water percentage, actual is to utilize water percentage to infer drying stress, belongs to indirect measurement; Add on-line continuous test water percentage technology and still well thoroughly do not solve so far, the process control that makes it the drying of wood still has empirical significantly.
Summary of the invention
The purpose of this invention is to provide stress detection in a kind of timber drying, it can solve methods such as hierarchy slicing method, interdigitated electrode structure method, watt curved method can not be directly, the problem of METHOD FOR CONTINUOUS DETERMINATION in good time, and can not quantitatively directly test with measuring accuracy on be difficult to guaranteed problem.
Pick-up unit of the present invention comprises anchor clamps; Pick-up unit of the present invention also comprises drawing stress sensor, analog to digital converter, computing machine; Described drawing stress sensor is packed on the anchor clamps, and the output terminal of described drawing stress sensor is connected with the input end of analog to digital converter, and the output terminal of analog to digital converter is connected with input end and computer; Described anchor clamps are made up of long jig plate on jig plate, weak point, short lower press plate, L shaped lower press plate, two pillars, four bolts and the base gone up; Described two pillars vertically secured in parallel on base, the upper end of described two pillars is affixed with the two ends of long upward jig plate, jig plate is positioned at long dead ahead of going up jig plate on the described weak point, the riser of described L shaped lower press plate is positioned at long below of going up jig plate, short lower press plate be positioned at short go up jig plate under, and short lower press plate is contained on the leveling board of shape lower press plate, link together by bolt respectively between the two ends of the two ends of jig plate and long upward jig plate and between the two ends of the riser of the two ends of short lower press plate and L shaped lower press plate on the weak point, the lower surface of described L shaped lower press plate is provided with inner bolt hole, the external thread rod of described drawing stress sensor upper end is contained in the inner bolt hole of L shaped lower press plate and with L shaped lower press plate and is threaded, and the lower end and the base of drawing stress sensor are affixed.
Detection method of the present invention is finished like this: the timber test specimen is fixed on the anchor clamps, the timber test specimen is carried out dried, carrying out along with timber test specimen dry run, the timber test specimen begins to shrink, when being suppressed, its drawdown deformation produces differential contraction stress, the simulating signal of this differential contraction stress by the drawing stress sensor is input to analog to digital converter and changes digital signal into, be input at last carry out in the computing machine in good time, the stress in the METHOD FOR CONTINUOUS DETERMINATION timber test specimen dry run.
The present invention has following beneficial effect: apparatus structure of the present invention is simple, installation is easy; Method of the present invention is by the drawdown deformation (certain size that keep test specimen) of the constraint of the anchor clamps in apparatus of the present invention timber test specimen in dry run, utilize the drawing stress sensor come directly, in good time, METHOD FOR CONTINUOUS DETERMINATION follows the differential contraction stress in the timber drying, and the methods such as hierarchy slicing method, interdigitated electrode structure method, watt curved method of having solved can not be directly, the problem of METHOD FOR CONTINUOUS DETERMINATION in good time, and can not quantitatively directly test with measuring accuracy on be difficult to guaranteed problem.Adopt the measured stress of method of the present invention to comprise because all stress of the stress that moisture gradient causes belong to the total stress that produces in the timber drying.This has more operability and accuracy with to measure the method or the means of stress indirectly by strain or water percentage obviously different in the past in the actual drying production run.
Description of drawings
Fig. 1 is the front view (timber test specimen 14 is housed) of device of the present invention, and Fig. 2 is the left view of Fig. 1
(not representing analog to digital converter 3 and computing machine 4), Fig. 3 is the vertical view (not representing analog to digital converter 3 and computing machine 4) of Fig. 1, and Fig. 4 is the structural representation of embodiment three.
Embodiment
Embodiment one: in conjunction with Fig. 1 present embodiment is described, the device of present embodiment is made up of anchor clamps 1, drawing stress sensor 2, analog to digital converter 3, computing machine 4; Described drawing stress sensor 2 is packed on the anchor clamps 1, and the output terminal of described drawing stress sensor 2 is connected with the input end of analog to digital converter 3, and the output terminal of analog to digital converter 3 is connected with the input end of computing machine 4.The model of the drawing stress sensor 2 in the present embodiment is TLP-2KNHS, surveys device research institute by the Tokyo and makes; The model of analog to digital converter 3 is DC-104R, surveys device research institute by the Tokyo and makes.
Embodiment two: in conjunction with Fig. 1～Fig. 3 present embodiment is described, the anchor clamps 1 of present embodiment are gone up jig plate 9 on jig plate 8, weak point, short lower press plate 7, L shaped lower press plate 15, two pillars 10, four bolts 11 and base 6 and coupling bolt 18 is formed by long; Described two pillars 10 vertically secured in parallel on base 6, the upper end of described two pillars 10 is affixed with the two ends of long upward jig plate 8, jig plate 9 is positioned at long dead ahead of going up jig plate 8 on the described weak point, the riser 16 of described L shaped lower press plate 15 is positioned at long below of going up jig plate 8, short lower press plate 7 be positioned at short go up jig plate 9 under, and short lower press plate 7 is contained on the leveling board 17 of L shaped lower press plate 15, link together by bolt 11 respectively between the two ends of the two ends of jig plate 9 and long upward jig plate 8 and between the two ends of the riser 16 of the two ends of short lower press plate 7 and L shaped lower press plate 15 on the weak point, the lower surface of described L shaped lower press plate 15 is provided with inner bolt hole, the external thread rod 12 of described drawing stress sensor 2 upper ends is contained in the inner bolt hole of L shaped lower press plate 15 and with L shaped lower press plate 15 and is threaded, and it is affixed that the lower end of drawing stress sensor 2 and base 6 pass through coupling bolt 18.Simple in structure, easy installation, reliable operation so are set.Other composition and annexation are identical with embodiment one.
Embodiment three: in conjunction with Fig. 2 and Fig. 4 present embodiment is described, on the length of present embodiment between jig plate 8 and the short riser 16 of going up jig plate 9 corresponding medial surfaces and L shaped lower press plate 15 and the short lower press plate 7 corresponding medial surface be respectively equipped with annular knurl 13.So be provided with, can increase the friction force between anchor clamps 1 and the timber test specimen 14, guarantee that timber test specimen 14 is clamped on the anchor clamps 1 firmly.Other composition and annexation are identical with embodiment two.
Embodiment four: in conjunction with Fig. 1 present embodiment is described, the anchor clamps of present embodiment 1 are made by steel material.So be provided with, can guarantee the serviceable life of anchor clamps 1.Other composition and annexation are identical with embodiment one or two.
Embodiment five: the method for present embodiment is finished like this: timber test specimen 14 is fixed on the anchor clamps 1, timber test specimen 14 is carried out dried, carrying out along with timber test specimen 14 dry runs, timber test specimen 14 begins to shrink, when being suppressed, its drawdown deformation produces differential contraction stress, the simulating signal of this differential contraction stress by drawing stress sensor 2 is input to analog to digital converter 3 and changes digital signal into, be input at last carry out in the computing machine 4 in good time, the stress (referring to accompanying drawing 1) in METHOD FOR CONTINUOUS DETERMINATION timber test specimen 14 dry runs.
Claims (3)
1. stress detection in the timber drying, it comprises anchor clamps (1); It is characterized in that it also comprises drawing stress sensor (2), analog to digital converter (3), computing machine (4); Described drawing stress sensor (2) is packed on the anchor clamps (1), and the output terminal of described drawing stress sensor (2) is connected with the input end of analog to digital converter (3), and the output terminal of analog to digital converter (3) is connected with the input end of computing machine (4); Described anchor clamps (1) are made up of long jig plate (9) on jig plate (8), the weak point, short lower press plate (7), L shaped lower press plate (15), two pillars (10), four bolts (11) and the base (6) gone up; Described two pillars (10) vertically secured in parallel on base (6), the upper end of described two pillars (10) is affixed with the two ends of long upward jig plate (8), jig plate on the described weak point (9) is positioned at long dead ahead of going up jig plate (8), the riser (16) of described L shaped lower press plate (15) is positioned at long below of going up jig plate (8), short lower press plate (7) be positioned at short go up jig plate (9) under, and (7 are contained on the leveling board (17) of L shaped lower press plate (15) short lower press plate, the two ends of jig plate on the weak point (9) and the long jig plate of going up (link together by bolt (11) respectively between 8 the two ends and between the two ends of the riser (16) of the two ends of short lower press plate (7) and L shaped lower press plate (15), the lower surface of described L shaped lower press plate (15) is provided with inner bolt hole, the external thread rod (12) of described drawing stress sensor (2) upper end is contained in the inner bolt hole of L shaped lower press plate (15) and with L shaped lower press plate (15) and is threaded, and the lower end of drawing stress sensor (2) and base (6) are affixed.
2. stress detection in the timber drying according to claim 1 is characterized in that corresponding medial surface is respectively equipped with annular knurl (13) between jig plate on the described length (8) and the short riser (16) of going up corresponding medial surface of jig plate (9) and L shaped lower press plate (15) and the short lower press plate (7).
3. stress detection in the timber drying according to claim 1 is characterized in that described anchor clamps (1) are made by steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101445214A CN101149370B (en) | 2007-10-30 | 2007-10-30 | Timber drying stress detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101445214A CN101149370B (en) | 2007-10-30 | 2007-10-30 | Timber drying stress detection device and method |
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| Publication Number | Publication Date |
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| CN101149370A CN101149370A (en) | 2008-03-26 |
| CN101149370B true CN101149370B (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101445214A Expired - Fee Related CN101149370B (en) | 2007-10-30 | 2007-10-30 | Timber drying stress detection device and method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554990B (en) * | 2012-01-20 | 2015-07-15 | 汕头市宜华家具有限公司 | Wood drying method |
| CN103983391A (en) * | 2014-05-20 | 2014-08-13 | 内蒙古农业大学 | Device for measuring air shrinkage force of timber |
| CN105180640B (en) * | 2015-10-19 | 2017-07-07 | 东北林业大学 | The method for drying wood of multi-parameter monitoring |
| CN110346519A (en) * | 2019-07-30 | 2019-10-18 | 内蒙古农业大学 | A kind of online lossless detection method of timber implosion and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6308571B1 (en) * | 1998-09-02 | 2001-10-30 | Weyerhaeuser Company | Method for determining crook potential in wood |
| CN1540269A (en) * | 2003-04-24 | 2004-10-27 | 中国林业科学研究院木材工业研究所 | Method and equipment for releasing internal stress through drying wood |
| WO2007028856A1 (en) * | 2005-09-09 | 2007-03-15 | Korwensuun Konetehdas Oy | Method for the determination of the stresses occurring in wood when drying |
-
2007
- 2007-10-30 CN CN2007101445214A patent/CN101149370B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6308571B1 (en) * | 1998-09-02 | 2001-10-30 | Weyerhaeuser Company | Method for determining crook potential in wood |
| CN1540269A (en) * | 2003-04-24 | 2004-10-27 | 中国林业科学研究院木材工业研究所 | Method and equipment for releasing internal stress through drying wood |
| WO2007028856A1 (en) * | 2005-09-09 | 2007-03-15 | Korwensuun Konetehdas Oy | Method for the determination of the stresses occurring in wood when drying |
Non-Patent Citations (7)
| Title |
|---|
| H.-P. Stohr, Pretoria.Shrinkage differential as a measure for drying stressdetermination.Wood Sci. Technol.22.1988,22121-128. * |
| 程万里，刘一星，師岡敏朗，则元京.高温高压蒸汽干燥过程中木材的收缩应力特征.北京林业大学学报27 2.2005,27(2),101-106. |
| 程万里,刘一星,師岡敏朗,则元京.高温高压蒸汽干燥过程中木材的收缩应力特征.北京林业大学学报27 2.2005,27(2),101-106. * |
| 程万里，刘一星，師岡敏朗.高温高压蒸汽条件下木材的拉伸应力松弛.北京林业大学学报29 4.2007,29(4),84-89. |
| 程万里,刘一星,師岡敏朗.高温高压蒸汽条件下木材的拉伸应力松弛.北京林业大学学报29 4.2007,29(4),84-89. * |
| 高建民，余雁，刘志军.木材干燥应力连续监测方法的研究.木材工业18 3.2004,18(3),1-4. |
| 高建民,余雁,刘志军.木材干燥应力连续监测方法的研究.木材工业18 3.2004,18(3),1-4. * |
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