CN113311007A - Moisture detection device and method for wood - Google Patents
Moisture detection device and method for wood Download PDFInfo
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- 239000002023 wood Substances 0.000 title claims abstract description 154
- 238000001514 detection method Methods 0.000 title claims abstract description 85
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- 230000000903 blocking effect Effects 0.000 claims description 18
- 230000004888 barrier function Effects 0.000 claims description 16
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Abstract
The invention discloses a moisture detection device for wood, which comprises a wood conveying mechanism, a moisture detection mechanism and a supporting mechanism, wherein the wood conveying mechanism comprises a conveying mechanism body and a supporting mechanism body, and the supporting mechanism body comprises: the wood conveying mechanism comprises a conveying belt, a first rotating shaft, a second rotating shaft, a third rotating shaft and a first driving motor, wherein the first rotating shaft, the second rotating shaft, the third rotating shaft and the first driving motor are arranged on the supporting mechanism; the moisture detection mechanism comprises a spectrum emission probe, a spectrum receiving probe and a spectrum analyzer which are fixed on the supporting mechanism. The invention also provides a moisture detection method for the xylophyta. By adopting the invention, the water content of the wood is automatically detected, and the measurement precision of the water content is improved.
Description
Technical Field
The invention relates to the field of moisture detection, in particular to a moisture detection device and method for wood.
Background
The floor, especially the solid wood floor, is a preferable material for indoor and even outdoor ground decoration because of the functions of difficult heat conduction, warm in winter and cool in summer, comfortable foot feeling and beautiful texture. Wherein, when people chose for use solid wood floor, all can regard the moisture content of solid wood floor as an especially important selection for use index usually, if the moisture content of solid wood floor is higher than service environment's balanced moisture content, then the condition of shrink will appear in the solid wood floor, otherwise, the expanded condition will appear in the solid wood floor, and these two kinds of conditions all can influence the life of solid wood floor.
However, the existing detection instrument for the solid wood floor is generally simple and crude, has low precision, and cannot correctly reflect the real water content of the solid wood floor, so that the water content marked on the solid wood floor is different from the correct water content when the solid wood floor is sold, and the expansion or contraction of the solid wood floor still occurs after a user purchases the solid wood floor marked with the proper water content, thereby greatly influencing the user experience. In addition, most of the existing detection instruments are used for manual measurement, so that the measurement error is further increased.
Disclosure of Invention
The invention aims to provide a device and a method for detecting moisture of wood, which can automatically detect the moisture content of the wood and improve the measurement precision of the moisture content.
In order to solve the technical problem, the invention provides a moisture detection device for wood, which comprises a wood conveying mechanism, a moisture detection mechanism and a support mechanism, wherein the wood conveying mechanism comprises: the wood conveying mechanism comprises a conveying belt, a first rotating shaft, a second rotating shaft, a third rotating shaft and a first driving motor, wherein the first rotating shaft, the second rotating shaft, the third rotating shaft and the first driving motor are arranged on the supporting mechanism; the moisture detection mechanism comprises a spectrum emission probe, a spectrum receiving probe and a spectrum analyzer which are fixed on the supporting mechanism, the spectrum receiving probe is arranged above the third rotating shaft and below the conveyor belt, and the spectrum emission probe is arranged right above the spectrum receiving probe and above the conveyor belt; the first driving motor is connected with the first rotating shaft and used for driving the first rotating shaft to rotate so as to convey wood to be detected arranged on the conveying belt to the moisture detection mechanism, the spectrum receiving probe is used for receiving a spectrum signal transmitted by the spectrum transmitting probe and transmitting the spectrum signal to the spectrum analyzer, and the spectrum analyzer is used for calculating the integral moisture content of the wood to be detected according to the spectrum signal.
Preferably, the wood conveying mechanism further comprises a conveyor belt supporting plate, the conveyor belt supporting plate is fixed on the supporting mechanism and used for supporting the conveyor belt, and a through hole is formed in the position, right opposite to the frequency spectrum receiving probe, of the conveyor belt supporting plate.
Preferably, the moisture detection device for the wood further comprises a limiting mechanism, the limiting mechanism comprises a first limiting module and a second limiting module, and the first limiting module and the second limiting module are respectively arranged at two sides of the frequency spectrum emission probe and are connected with the frequency spectrum emission probe; the first limiting module is used for acquiring a first limiting signal and transmitting the first limiting signal to the spectrum emission probe to start the spectrum emission probe, wherein the first limiting signal is an incoming signal; the second limit module is used for acquiring a second limit signal and transmitting the second limit signal to the spectrum emission probe to close the spectrum emission probe, wherein the second limit signal is a leaving signal.
Preferably, the moisture detection device for wood further comprises a guide mechanism, the guide mechanism comprises a first guide plate, a second guide plate, a first telescopic module and a second telescopic module, the first guide plate is fixed on the support mechanism through the first telescopic module, the second guide plate is fixed on the support mechanism through the second telescopic module, the first guide plate and the second guide plate are symmetrically arranged on two sides of the frequency spectrum emission probe and are perpendicular to the first rotating shaft, and the distance between the first guide plate and the second guide plate is adjusted simultaneously by the first telescopic module and the second telescopic module according to the width of wood to be detected.
Preferably, a reader is arranged on the first guide plate, an electronic tag is arranged on the wood to be detected, the electronic tag is used for storing ID information of the wood to be detected, the ID information comprises wood type information and wood density information, the reader is connected with the spectrum analyzer and is used for acquiring the ID information of the electronic tag and transmitting the ID information to the spectrum analyzer, and the spectrum analyzer calculates the whole moisture content of the wood to be detected according to the ID information and the spectrum signals.
Preferably, the moisture detection device for wood further comprises a blocking mechanism, the blocking mechanism comprises a third limiting module, a second driving motor and a blocking plate connected with the second driving motor, the second driving motor is fixedly arranged at the tail end of the first guide plate, the third limiting module is fixedly arranged at the tail end of the second guide plate, and the second driving motor is connected with the second limiting module and the third limiting module and used for driving the blocking plate to lift.
Preferably, the aperture of the through hole is 10-30 CM.
Preferably, the conveyor support plate is made of a plastic material.
Preferably, the vertical distances between the spectrum emission probe and the spectrum receiving probe and the wood to be detected are both 4-6 CM.
The invention also provides a moisture detection method for wood, which comprises the following steps: the first driving motor drives the first rotating shaft to rotate so as to convey the wood to be detected on the conveying belt to the moisture detection mechanism; acquiring ID information of an electronic tag arranged on the wood to be detected through a reader arranged on a first guide plate, wherein the ID information comprises wood type information and wood density information; the first guide plate is fixed on the supporting mechanism through a first telescopic module; judging whether the wood to be detected enters the moisture detection mechanism or not through the first limiting module, if so, starting the spectrum emission probe, and otherwise, keeping the spectrum emission probe closed; the first limiting module and the second limiting module are respectively arranged on two sides of the frequency spectrum emission probe and are connected with the frequency spectrum emission probe; judging whether the wood to be detected leaves the guide mechanism or not through the third limiting module, if so, driving the barrier plate to descend through the second driving motor, and otherwise, keeping the barrier plate to ascend; the third limiting module is fixedly arranged at the tail end of a second guide plate, the second guide plate is fixed on the supporting mechanism through a second telescopic module, the second driving motor is fixedly arranged at the tail end of the first guide plate, and the blocking plate is connected with the second driving motor; judging whether the wood to be detected leaves the moisture detection mechanism or not through a second limiting module, if so, closing the spectrum emission probe and driving the barrier plate to ascend through a second driving motor, otherwise, keeping the spectrum emission probe open and the barrier plate to descend; in the conveying process, a spectrum receiving probe receives a spectrum signal transmitted by the spectrum transmitting probe and transmits the spectrum signal to a spectrum analyzer; and calculating the whole moisture content of the wood to be detected according to the frequency spectrum signal and the ID information through a spectrum analyzer.
The beneficial effects of the implementation of the invention are as follows:
according to the invention, the first driving motor drives the first rotating shaft to rotate so as to convey the wood to be detected on the conveying belt to the moisture detection mechanism, the frequency spectrum receiving probe receives the frequency spectrum signal transmitted by the frequency spectrum transmitting probe and transmits the frequency spectrum signal to the spectrum analyzer, and the spectrum analyzer calculates the integral moisture content of the wood to be detected according to the frequency spectrum signal, so that the moisture content of the wood can be automatically detected; meanwhile, the frequency spectrum receiving probe is arranged above the third rotating shaft and below the conveyor belt, and the frequency spectrum transmitting probe is arranged right above the frequency spectrum receiving probe and above the conveyor belt, so that a frequency spectrum signal transmitted by the frequency spectrum transmitting probe is received by the frequency spectrum receiving probe only by penetrating through 1 layer of the conveyor belt without penetrating through a double-layer conveyor belt, the situations of microwave signal attenuation and distortion caused by the blockage of the double-layer conveyor belt and the overlarge distance between the frequency spectrum transmitting probe and the frequency spectrum receiving probe can be avoided, the optimal installation position of the frequency spectrum transmitting probe can be ensured, the frequency spectrum receiving probe is installed in the middle of the 2 layers of the conveyor belts, and the measurement precision of the water content is improved.
Drawings
FIG. 1 is a schematic front view of a moisture detecting apparatus for wood according to the present invention;
FIG. 2 is a schematic side view of a moisture detecting apparatus for wood according to the present invention;
FIG. 3 is a schematic structural view of a conveyor belt supporting plate of the moisture detecting device for wood according to the present invention;
FIG. 4 is a schematic structural diagram of a limiting mechanism of the moisture detection device for wood provided by the invention;
FIG. 5 is a schematic structural view of a guide mechanism and a blocking mechanism of the moisture detecting device for wood according to the present invention;
fig. 6 is a schematic flow chart of the method of the moisture detection device for wood provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.
As shown in fig. 1 to 2, the present invention provides a moisture detection device for wood, which comprises a wood conveying mechanism, a moisture detection mechanism and a support mechanism 3: the wood conveying mechanism comprises a conveying belt 11, a first rotating shaft 12, a second rotating shaft 13, a third rotating shaft 14 and a first driving motor 15, wherein the first rotating shaft 12, the second rotating shaft 13, the third rotating shaft 14 and the first driving motor 15 are arranged on the supporting mechanism 3, the first rotating shaft 12 and the second rotating shaft 13 are arranged on the same horizontal plane, the third rotating shaft 14 is arranged below the horizontal plane and is parallel to the first rotating shaft 12 and the second rotating shaft 13 respectively, and the conveying belt 11 is used for connecting the first rotating shaft 12, the second rotating shaft 13 and the third rotating shaft 14; the moisture detection mechanism comprises a spectrum emission probe 21, a spectrum receiving probe 22 and a spectrum analyzer 23 which are fixed on the supporting mechanism 3, the spectrum receiving probe 22 is arranged above the third rotating shaft 14 and below the conveyor belt 11, and the spectrum emission probe 21 is arranged right above the spectrum receiving probe 21 and above the conveyor belt 11; the first driving motor 15 is connected with the first rotating shaft 12 and used for driving the first rotating shaft 12 to rotate so as to convey the wood 7 to be detected arranged on the conveyor belt 11 to the moisture detection mechanism, the spectrum receiving probe 22 is used for receiving the spectrum signal transmitted by the spectrum transmitting probe 21 and transmitting the spectrum signal to the spectrum analyzer 23, and the spectrum analyzer 23 is used for calculating the whole moisture content of the wood 7 to be detected according to the spectrum signal.
According to the invention, the first driving motor 15 drives the first rotating shaft 12 to rotate so as to convey the wood 7 to be detected on the conveyor belt 11 to the moisture detection mechanism, the spectrum receiving probe 22 receives the spectrum signal transmitted by the spectrum transmitting probe 21 and transmits the spectrum signal to the spectrum analyzer 23, and the spectrum analyzer 23 calculates the integral moisture content of the wood 7 to be detected according to the spectrum signal, so that the moisture content of the wood can be automatically detected; meanwhile, the spectrum receiving probe 22 is arranged above the third rotating shaft 14 and below the conveyor belt 11, and the spectrum transmitting probe 21 is arranged right above the spectrum receiving probe 21 and above the conveyor belt 11, so that the spectrum signal transmitted by the spectrum transmitting probe 21 is received by the spectrum receiving probe 22 only by passing through 1 layer of conveyor belt without passing through a double-layer conveyor belt, the situations of microwave signal attenuation and distortion caused by the obstruction of the double-layer conveyor belt and the overlarge distance between the spectrum transmitting probe 21 and the spectrum receiving probe 22 can be avoided, the optimal installation position of the spectrum transmitting probe 21 can be ensured, and the spectrum receiving probe 22 is installed in the middle of the 2 layers of conveyor belts, thereby improving the measurement accuracy of the water content.
Specifically, the spectrum emission probe provided by the invention is a microwave emission sensor, the spectrum receiving probe is a microwave receiving sensor, a plurality of sections of spectrums with different frequencies are simultaneously emitted to the wood to be detected through the microwave sensor, water molecules (polar molecules) in the wood to be detected can absorb energy in an electromagnetic field, and the energy absorbed by the water molecules and the content of the water molecules are in a linear relation, so that the moisture content of the medium to be detected is calculated according to the characteristics. During detection, wood to be detected passes through the space between the two microwave sensors, the spectrum analyzer outputs a measured moisture value every 100ms in a calculation mode, and after the wood to be detected leaves the microwave sensors, the system automatically outputs the mean value of all measured moisture values of the wood to be detected (for example, if the detection time of the wood to be detected is 3 seconds, the spectrum analyzer measures 30 moisture values, and then the mean value is obtained). Therefore, the invention can continuously measure in a linear scanning detection mode, a non-contact detection process and high system detection precision, and the detection deviation can be stabilized within 1 degree. Meanwhile, the device has the advantages of simple and stable structure, difficult deformation and damage of the probe, convenient replacement of accessories, continuous measurement of the system, full coverage of the solid wood floor in a measurement area and higher detection precision.
Preferably, the vertical distances between the spectrum emission probe 21 and the spectrum receiving probe 22 and the wood 7 to be detected are both 4CM to 6 CM.
It should be noted that, in order to avoid that the spectrum signal transmitted by the spectrum transmitting probe 21 can be accurately received by the spectrum receiving probe 22, the vertical distance between the spectrum transmitting probe 21 and the spectrum receiving probe 22 and the wood 7 to be detected is not more than 6CM, and meanwhile, in order to ensure the passing property (different thickness) of the wood to be detected, the vertical distance between the spectrum transmitting probe 21 and the spectrum receiving probe 22 and the wood 7 to be detected is not less than 4CM, but is not limited thereto.
As shown in fig. 3, preferably, the wood conveying mechanism 1 further includes a conveyor belt supporting plate 16, the conveyor belt supporting plate 16 is fixed on the supporting mechanism 3 and is used for supporting the conveyor belt 11, and a through hole 161 is formed in the conveyor belt supporting plate 16 at a position opposite to the spectrum receiving probe 22. Furthermore, the aperture of through-hole is 10 ~ 30CM, the conveyer belt backup pad is made by the plastic material, but all do not select here.
It should be noted that, in this embodiment, the conveyor belt is supported by the conveyor belt supporting plate 16, so that the conveyor belt can be prevented from being sunk or falling off due to an excessive stress during the transmission process, and meanwhile, in order to reduce the signal interference between the spectrum emission probe 21 and the spectrum reception probe 22, the through hole 161 is formed in the conveyor belt supporting plate 16 at the position corresponding to the spectrum reception probe 22, so that the signal emitted by the spectrum emission probe 21 can reach the spectrum reception probe 22 only through one layer of conveyor belt. In addition, the aperture of through-hole is 10 ~ 30CM, the conveyer belt backup pad is made by the plastic material, nevertheless all do not select here, the aperture of through-hole with the size of frequency spectrum emission probe 21 and frequency spectrum receiving probe 22 has the relation, and in order to improve detection efficiency, the aperture of through-hole is not less than 10CM, and in order to ensure the effect of conveyer belt backup pad, the aperture is not more than 30CM, and the conveyer belt backup pad need select for use the plastic material, forbids to use the steel sheet strictly, and the steel sheet interferes microwave signal.
As shown in fig. 4, preferably, the moisture detection device for wood further includes a limiting mechanism, the limiting mechanism includes a first limiting module 41 and a second limiting module 42, and the first limiting module 41 and the second limiting module 42 are respectively disposed at two sides of the spectrum emission probe 21 and both connected thereto; the first limit module 41 is configured to obtain a first limit signal and transmit the first limit signal to the spectrum emission probe 21 to turn on the spectrum emission probe 21, where the first limit signal is an incoming signal; the second limit module 42 is configured to acquire a second limit signal and transmit the second limit signal to the spectrum transmitting probe 21 to turn off the spectrum transmitting probe 21, where the second limit signal is a leave signal.
It should be noted that, in this embodiment, a first limit signal is obtained by the first limit module 41 and is transmitted to the spectrum emission probe 21 to turn on the spectrum emission probe 21, where the first limit signal is an incoming signal; and acquiring a second limit signal through the second limit module 42 and transmitting the second limit signal to the spectrum emission probe 21 to turn off the spectrum emission probe 21, wherein the second limit signal is a leaving signal. Therefore, whether timber that awaits measuring gets into the detection zone (frequency spectrum emission probe 21 and frequency spectrum receiving probe 22 region) can be judged through first spacing module, whether timber that awaits measuring leaves the detection zone completely through the spacing module of second judgement, thereby control correspondingly the switch of frequency spectrum emission probe 21 can switch frequency spectrum emission probe 21 according to the detection demand, thereby can practice thrift electric power, and the while is accurate to acquire the complete frequency spectrum signal of timber that awaits measuring when passing through the detection zone, avoids appearing omitting, and then improves the precision that detects.
As shown in fig. 5, preferably, the moisture detection device for wood further includes a guide mechanism, the guide mechanism includes a first guide plate 51, a second guide plate 52, a first telescopic module 53 and a second telescopic module 54, the first guide plate 51 is fixed on the support mechanism 3 through the first telescopic module 53, the second guide plate 52 is fixed on the support mechanism 3 through the second telescopic module 54, the first guide plate 51 and the second guide plate 52 are symmetrically disposed on two sides of the spectrum emission probe 21 and are both perpendicular to the first rotating shaft 12, and the first telescopic module 53 and the second telescopic module 54 simultaneously adjust a distance between the first guide plate 51 and the second guide plate 52 according to a width of the wood 7 to be detected.
It should be noted that, in this embodiment, the first telescopic module 53 and the second telescopic module 54 simultaneously adjust the distance between the first guide plate 51 and the second guide plate 52 according to the width of the wood 7 to be detected, so as to meet the requirements of the wood to be detected with different widths while ensuring the correct conveying direction (deviation correction in the traveling direction) of the wood to be detected, and have the advantage of flexible adjustment.
Further, a reader 6 is arranged on the first guide plate 51, an electronic tag 8 is arranged on the wood to be detected, the electronic tag 8 is used for storing ID information of the wood 7 to be detected, the ID information includes wood species information and wood density information, the reader 6 is connected with the spectrum analyzer 23 and is used for acquiring the ID information of the electronic tag 8 and transmitting the ID information to the spectrum analyzer 23, and the spectrum analyzer 23 calculates the overall moisture content of the wood 7 to be detected according to the ID information and the spectrum signal.
It should be noted that, since the calculation rules of the water content of different types of wood are different, in order to improve the detection accuracy of the water content, it is necessary to select an appropriate calculation rule according to the type of wood. Therefore, in the embodiment, the reader 6 is arranged on the first guide plate 51, the electronic tag 8 is arranged on the wood to be detected, the electronic tag 8 is used for storing the ID information of the wood 7 to be detected, the ID information includes wood species information and wood density information, so that when the detection starts, the ID information of the wood to be detected can be acquired and sent to the spectrum analyzer 23, and when the water content is calculated, the corresponding calculation rule is selected according to the corresponding ID information, so that the detection accuracy of the water content is improved.
Preferably, the moisture detection device for wood further comprises a blocking mechanism, the blocking mechanism comprises a third limiting module 91, a second driving motor 92 and a blocking plate 93 connected with the second driving motor 92, the second driving motor 92 is fixedly arranged at the tail end of the first guide plate 51, the third limiting module 91 is fixedly arranged at the tail end of the second guide plate 52, and the second driving motor 92 is connected with the second limiting module 42 and the third limiting module 91 and is used for driving the blocking plate 93 to ascend and descend.
It should be noted that in this embodiment, whether the wood to be detected completely leaves the guide mechanism is detected by the third limiting module 91, and when the wood to be detected completely leaves the guide mechanism, the second driving motor 92 drives the blocking plate to descend; whether timber 7 that awaits measuring leaves moisture detection mechanism through second spacing module 42 judgement simultaneously, if yes, then close frequency spectrum emission probe 21 and rise through second driving motor 92 drive barrier plate 93 to the timber that awaits measuring of permission next gets into the detection zone, otherwise keeps the decline state of barrier plate, avoids two to wait to detect timber and overlaps at the detection zone, influences the detection precision of moisture content.
As shown in fig. 6, the present invention also provides a moisture detection method for wood, including:
s101, driving a first rotating shaft 12 to rotate through a first driving motor 15 so as to convey the wood 7 to be detected, which is arranged on a conveying belt 11, to a moisture detection mechanism;
s102, acquiring ID information of an electronic tag arranged on the wood to be detected through a reader arranged on a first guide plate, wherein the ID information comprises wood type information and wood density information; the first guide plate is fixed on the supporting mechanism through a first telescopic module;
s103, judging whether the wood to be detected enters the moisture detection mechanism or not through the first limiting module, if so, starting the frequency spectrum emission probe, and otherwise, keeping the frequency spectrum emission probe closed; the first limiting module and the second limiting module are respectively arranged on two sides of the frequency spectrum emission probe and are connected with the frequency spectrum emission probe;
s104, judging whether the wood to be detected leaves the guide mechanism or not through a third limiting module, if so, driving the barrier plate to descend through a second driving motor, and otherwise, keeping the barrier plate to ascend; the third limiting module is fixedly arranged at the tail end of a second guide plate, the second guide plate is fixed on the supporting mechanism through a second telescopic module, the second driving motor is fixedly arranged at the tail end of the first guide plate, and the blocking plate is connected with the second driving motor;
s105, judging whether the wood to be detected leaves the moisture detection mechanism or not through a second limiting module, if so, closing the spectrum emission probe and driving the barrier plate to ascend through a second driving motor, otherwise, keeping the spectrum emission probe open and the barrier plate to descend;
s106, in the conveying process, receiving the spectrum signal transmitted by the spectrum transmitting probe through the spectrum receiving probe and transmitting the spectrum signal to a spectrum analyzer;
and S107, calculating the overall moisture content of the wood to be detected according to the spectrum signal and the ID information through a spectrum analyzer.
According to the invention, the first driving motor 15 drives the first rotating shaft 12 to rotate so as to convey the wood 7 to be detected on the conveyor belt 11 to the moisture detection mechanism, the spectrum receiving probe 22 receives the spectrum signal transmitted by the spectrum transmitting probe 21 and transmits the spectrum signal to the spectrum analyzer 23, and the spectrum analyzer 23 calculates the integral moisture content of the wood 7 to be detected according to the spectrum signal, so that the moisture content of the wood can be automatically detected; meanwhile, the spectrum receiving probe 22 is arranged above the third rotating shaft 14 and below the conveyor belt 11, and the spectrum transmitting probe 21 is arranged right above the spectrum receiving probe 21 and above the conveyor belt 11, so that the spectrum signal transmitted by the spectrum transmitting probe 21 is received by the spectrum receiving probe 22 only by passing through 1 layer of conveyor belt without passing through a double-layer conveyor belt, the situations of microwave signal attenuation and distortion caused by the obstruction of the double-layer conveyor belt and the overlarge distance between the spectrum transmitting probe 21 and the spectrum receiving probe 22 can be avoided, the optimal installation position of the spectrum transmitting probe 21 can be ensured, and the spectrum receiving probe 22 is installed in the middle of the 2 layers of conveyor belts, thereby improving the measurement accuracy of the water content.
The spectrum emission probe provided by the invention is a microwave emission sensor, the spectrum receiving probe is a microwave receiving sensor, a plurality of sections of spectrums with different frequencies are simultaneously emitted to the wood to be detected through the microwave sensor, water molecules (polar molecules) in the wood to be detected can absorb energy in an electromagnetic field, and the energy absorbed by the water molecules and the water molecule content form a linear relation, so that the water content of a medium to be detected is calculated according to the characteristics. During detection, wood to be detected passes through the space between the two microwave sensors, the spectrum analyzer outputs a measured moisture value every 100ms in a calculation mode, and after the wood to be detected leaves the microwave sensors, the system automatically outputs the mean value of all measured moisture values of the wood to be detected (for example, if the detection time of the wood to be detected is 3 seconds, the spectrum analyzer measures 30 moisture values, and then the mean value is obtained). Therefore, the invention can continuously measure in a linear scanning detection mode, a non-contact detection process and high system detection precision, and the detection deviation can be stabilized within 1 degree. Meanwhile, the device has the advantages of simple and stable structure, difficult deformation and damage of the probe, convenient replacement of accessories, continuous measurement of the system, full coverage of the solid wood floor in a measurement area and higher detection precision.
Meanwhile, a first limit signal is obtained through the first limit module 41 and transmitted to the spectrum emission probe 21 to turn on the spectrum emission probe 21, wherein the first limit signal is an incoming signal; and acquiring a second limit signal through the second limit module 42 and transmitting the second limit signal to the spectrum emission probe 21 to turn off the spectrum emission probe 21, wherein the second limit signal is a leaving signal. Therefore, whether timber that awaits measuring gets into the detection zone (frequency spectrum emission probe 21 and frequency spectrum receiving probe 22 region) can be judged through first spacing module, whether timber that awaits measuring leaves the detection zone completely through the spacing module of second judgement, thereby control correspondingly the switch of frequency spectrum emission probe 21 can switch frequency spectrum emission probe 21 according to the detection demand, thereby can practice thrift electric power, and the while is accurate to acquire the complete frequency spectrum signal of timber that awaits measuring when passing through the detection zone, avoids appearing omitting, and then improves the precision that detects.
In addition, since the calculation rules of the water content of different types of wood are different, in order to improve the detection accuracy of the water content, it is necessary to select an appropriate calculation rule according to the type of wood. Therefore, in the embodiment, the reader 6 is arranged on the first guide plate 51, the electronic tag 8 is arranged on the wood to be detected, the electronic tag 8 is used for storing the ID information of the wood 7 to be detected, the ID information includes wood species information and wood density information, so that when the detection starts, the ID information of the wood to be detected can be acquired and sent to the spectrum analyzer 23, and when the water content is calculated, the corresponding calculation rule is selected according to the corresponding ID information, so that the detection accuracy of the water content is improved.
Further, whether the wood to be detected completely leaves the guide mechanism is detected through the third limiting module 91, and when the wood to be detected completely leaves the guide mechanism, the second driving motor 92 drives the blocking plate to descend; whether timber 7 that awaits measuring leaves moisture detection mechanism through second spacing module 42 judgement simultaneously, if yes, then close frequency spectrum emission probe 21 and rise through second driving motor 92 drive barrier plate 93 to the timber that awaits measuring of permission next gets into the detection zone, otherwise keeps the decline state of barrier plate, avoids two to wait to detect timber and overlaps at the detection zone, influences the detection precision of moisture content.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a moisture detection device for timber which characterized in that, includes timber conveying mechanism, moisture detection mechanism and supporting mechanism:
the wood conveying mechanism comprises a conveying belt, a first rotating shaft, a second rotating shaft, a third rotating shaft and a first driving motor, wherein the first rotating shaft, the second rotating shaft, the third rotating shaft and the first driving motor are arranged on the supporting mechanism;
the moisture detection mechanism comprises a spectrum emission probe, a spectrum receiving probe and a spectrum analyzer which are fixed on the supporting mechanism, the spectrum receiving probe is arranged above the third rotating shaft and below the conveyor belt, and the spectrum emission probe is arranged right above the spectrum receiving probe and above the conveyor belt;
the first driving motor is connected with the first rotating shaft and used for driving the first rotating shaft to rotate so as to convey wood to be detected arranged on the conveying belt to the moisture detection mechanism, the spectrum receiving probe is used for receiving a spectrum signal transmitted by the spectrum transmitting probe and transmitting the spectrum signal to the spectrum analyzer, and the spectrum analyzer is used for calculating the integral moisture content of the wood to be detected according to the spectrum signal.
2. The moisture detecting device for wood according to claim 1, wherein the wood conveying mechanism further comprises a conveyor belt supporting plate fixed to the supporting mechanism for supporting the conveyor belt, and a through hole is formed in the conveyor belt supporting plate at a position opposite to the spectrum receiving probe.
3. The wood moisture detecting device according to claim 2, further comprising a limiting mechanism, wherein the limiting mechanism comprises a first limiting module and a second limiting module, and the first limiting module and the second limiting module are respectively arranged at two sides of the spectrum emission probe and are connected with the spectrum emission probe;
the first limiting module is used for acquiring a first limiting signal and transmitting the first limiting signal to the spectrum emission probe to start the spectrum emission probe, wherein the first limiting signal is an incoming signal;
the second limit module is used for acquiring a second limit signal and transmitting the second limit signal to the spectrum emission probe to close the spectrum emission probe, wherein the second limit signal is a leaving signal.
4. The moisture detection device for wood according to claim 3, further comprising a guide mechanism, wherein the guide mechanism comprises a first guide plate, a second guide plate, a first telescopic module and a second telescopic module, the first guide plate is fixed on the support mechanism through the first telescopic module, the second guide plate is fixed on the support mechanism through the second telescopic module, the first guide plate and the second guide plate are symmetrically arranged on two sides of the spectrum emission probe and are perpendicular to the first rotation axis, and the first telescopic module and the second telescopic module simultaneously adjust the distance between the first guide plate and the second guide plate according to the width of wood to be detected.
5. The wood moisture detecting device according to claim 4, wherein a reader is provided on the first guide plate, an electronic tag is provided on the wood to be detected, the electronic tag is used for storing ID information of the wood to be detected, the ID information includes wood species information and wood density information, the reader is connected with the spectrum analyzer and is used for acquiring the ID information of the electronic tag and transmitting the ID information to the spectrum analyzer, and the spectrum analyzer calculates the overall moisture content of the wood to be detected according to the ID information and the spectrum signals.
6. The moisture detection device for wood according to claim 5, further comprising a blocking mechanism, wherein the blocking mechanism comprises a third limiting module, a second driving motor and a blocking plate connected with the second driving motor, the second driving motor is fixedly arranged at the end of the first guide plate, the third limiting module is fixedly arranged at the end of the second guide plate, and the second driving motor is connected with the second limiting module and the third limiting module and used for driving the blocking plate to lift.
7. The moisture detecting device for wood according to claim 6, wherein the diameter of the through hole is 10 to 30 CM.
8. The moisture detecting device for wood according to claim 7, wherein the conveyor belt supporting plate is made of a plastic material.
9. The wood moisture detecting device according to claim 8, wherein the vertical distance between the spectrum transmitting probe and the spectrum receiving probe and the wood to be detected is 4-6 CM.
10. A moisture detection method based on the moisture detection device according to any one of claims 1 to 9, comprising:
the first driving motor drives the first rotating shaft to rotate so as to convey the wood to be detected on the conveying belt to the moisture detection mechanism;
acquiring ID information of an electronic tag arranged on the wood to be detected through a reader arranged on a first guide plate, wherein the ID information comprises wood type information and wood density information; the first guide plate is fixed on the supporting mechanism through a first telescopic module;
judging whether the wood to be detected enters the moisture detection mechanism or not through the first limiting module, if so, starting the spectrum emission probe, and otherwise, keeping the spectrum emission probe closed; the first limiting module and the second limiting module are respectively arranged on two sides of the frequency spectrum emission probe and are connected with the frequency spectrum emission probe;
judging whether the wood to be detected leaves the guide mechanism or not through the third limiting module, if so, driving the barrier plate to descend through the second driving motor, and otherwise, keeping the barrier plate to ascend; the third limiting module is fixedly arranged at the tail end of a second guide plate, the second guide plate is fixed on the supporting mechanism through a second telescopic module, the second driving motor is fixedly arranged at the tail end of the first guide plate, and the blocking plate is connected with the second driving motor;
judging whether the wood to be detected leaves the moisture detection mechanism or not through a second limiting module, if so, closing the spectrum emission probe and driving the barrier plate to ascend through a second driving motor, otherwise, keeping the spectrum emission probe open and the barrier plate to descend;
in the conveying process, a spectrum receiving probe receives a spectrum signal transmitted by the spectrum transmitting probe and transmits the spectrum signal to a spectrum analyzer;
and calculating the whole moisture content of the wood to be detected according to the frequency spectrum signal and the ID information through a spectrum analyzer.
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Application publication date: 20210827 |