CN109932424B - Method and system for detecting wood board bulge - Google Patents
Method and system for detecting wood board bulge Download PDFInfo
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- CN109932424B CN109932424B CN201910271533.6A CN201910271533A CN109932424B CN 109932424 B CN109932424 B CN 109932424B CN 201910271533 A CN201910271533 A CN 201910271533A CN 109932424 B CN109932424 B CN 109932424B
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Abstract
The invention relates to the field of wood board detection, in particular to a wood board bulge detection method and system. The wood board bulge detection method comprises the following steps: the receiving transducer receives the signal sent by the transmitting transducer; calculating the number of echo signals which are greater than a preset threshold value in the signals; judging whether the wood board bulges or not according to the number of the echo signals larger than the first preset threshold value; the transmitting transducers are arranged on one side of the wood board production line at uniform intervals, and the receiving transducers are arranged on the other side of the wood board production line at uniform intervals. A plurality of transmitting transducers and receiving transducers are respectively arranged on two sides of a wood board production line, the receiving transducers receive signals transmitted by the transmitting transducers, and whether the wood board bulges or not can be judged by judging the number of echo signals larger than a first preset threshold value.
Description
Technical Field
The invention relates to the field of wood board detection, in particular to a wood board bulge detection method and system.
Background
In the prior art, more and more furniture is made of shaving boards, and the quality of the shaving boards has direct influence on the quality of the furniture, particularly whether the shaving boards bulge or not. At present, no good detection method exists for whether the shaving board bulges.
Disclosure of Invention
Therefore, a method for detecting wood board bulges is needed to solve the problem that the wood board bulges cannot be monitored. The specific technical scheme is as follows:
a wood board bulge detection method comprises the following steps: the receiving transducer receives the signal sent by the transmitting transducer; calculating the number of echo signals which are greater than a preset threshold value in the signals; judging whether the wood board bulges or not according to the number of the echo signals larger than the first preset threshold value; the transmitting transducers are arranged on one side of the wood board production line at uniform intervals, and the receiving transducers are arranged on the other side of the wood board production line at uniform intervals.
Further, the step of determining whether the wood board bulges according to the number of the echo signals larger than the first preset threshold value further comprises the following steps: if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through; if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges; and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
Further, the step of determining whether the wood board bulges according to the number of the echo signals larger than the first preset threshold value further comprises the following steps: and judging whether the two adjacent receiving transducers have echoes larger than a second preset threshold and smaller than a first preset threshold, and if the two adjacent receiving transducers have echoes larger than the second preset threshold and smaller than the first preset threshold, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges.
Furthermore, the distance between two adjacent transmitting transducers is set to be 3.8 cm, and the distance between two adjacent receiving transducers is set to be 3.8 cm.
Further, the number of the transmitting transducers and the number of the receiving transducers are respectively 32.
In order to solve the technical problem, the wood board bulge detection system is further provided, and the specific technical scheme is as follows:
a plank bulge detection system comprising: the device comprises a transmitting transducer, a receiving transducer and a control unit; the transmitting transducers are uniformly arranged on one side of the wood board production line at intervals, and the receiving transducers are uniformly arranged on the other side of the wood board production line at intervals; the receiving transducer is configured to: receiving a signal sent by a transmitting transducer; the control unit is used for: calculating the number of echo signals which are greater than a preset threshold value in the signals; and judging whether the wood board bulges or not according to the number of the echo signals larger than the first preset threshold value.
Further, the control unit is further configured to: if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through; if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges; and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
Further, the control unit is further configured to: and judging whether the two adjacent receiving transducers have echoes larger than a second preset threshold and smaller than a first preset threshold, and if the two adjacent receiving transducers have echoes larger than the second preset threshold and smaller than the first preset threshold, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges.
Furthermore, the distance between two adjacent transmitting transducers is 3.8 cm, and the distance between two adjacent receiving transducers is 3.8 cm.
Further, the number of the transmitting transducers and the number of the receiving transducers are respectively 32.
The invention has the beneficial effects that: a plurality of transmitting transducers and receiving transducers are respectively arranged on two sides of a wood board production line, the receiving transducers receive signals transmitted by the transmitting transducers, and whether the wood board bulges or not can be judged by judging the number of echo signals larger than a first preset threshold value.
Furthermore, in the blind area region between two adjacent transmitting transducers, the judgment can be carried out by combining the signals of two adjacent probes, namely: and judging whether the two adjacent receiving transducers have echoes larger than a second preset threshold and smaller than a first preset threshold, and if the two adjacent receiving transducers have echoes larger than the second preset threshold and smaller than the first preset threshold, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges. And then whether the bulge exists in the blind area is judged, and the zero blind area bulge detection of the wood board is achieved.
Drawings
FIG. 1 is a flowchart of a wood board bulge detection method according to an embodiment;
FIG. 2 is a schematic diagram of the positions of the receiving transducer and the transmitting transducer according to the embodiment;
FIG. 3 is a schematic diagram of a single channel sensor according to an embodiment;
FIG. 4 is a schematic diagram of input and output signals according to an embodiment;
FIG. 5 is a schematic view of an entire wood board bulge detection system according to an embodiment;
FIG. 6 is a schematic diagram of the location of two receiving transducers and a transmitting transducer according to an embodiment;
FIG. 7 is a block diagram of a wood board bulge detection system according to an embodiment.
Description of reference numerals:
700. a wood board bump detection system is provided,
701. a control unit for controlling the operation of the display unit,
702. the transmitting transducer is connected with the power supply through a power supply,
703. a receiving transducer.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
In this embodiment, a wood board bulge detection method may be applied to a wood board bulge detection system, where the wood board bulge detection system includes: the wood board production line comprises a transmitting transducer, a receiving transducer and a control unit, wherein the transmitting transducer is arranged on one side of the wood board production line at uniform intervals, the receiving transducer is arranged on the other side of the wood board production line at uniform intervals, the control unit is connected with the transmitting transducer and the receiving transducer, and in the embodiment, the control unit is preferably a single chip microcomputer.
Referring to fig. 1 to 6, in the present embodiment, a flow chart of a wood board bulge detection method is as follows:
a wood board bulge detection method comprises the following steps:
step S101: the receiving transducer receives the signal sent by the transmitting transducer.
Step S102: calculating the number of echo signals which are greater than a preset threshold value in the signals,
Step S103: judging whether the wood board bulges or not according to the number of the echo signals larger than the first preset threshold value; the transmitting transducers are arranged on one side of the wood board production line at uniform intervals, and the receiving transducers are arranged on the other side of the wood board production line at uniform intervals.
In the present embodiment, the first preset threshold is 2000 mv.
A plurality of transmitting transducers and receiving transducers are respectively arranged on two sides of a wood board production line, the receiving transducers receive signals transmitted by the transmitting transducers, and whether the wood board bulges or not can be judged by judging the number of echo signals larger than a first preset threshold value.
It should be noted first that when the particle board is not burdened, the ultrasonic waves pass through the particle board and the receiving transducer will receive a distinct sound wave signal, whereas when the particle board is burdened, the signal will become weak. And in the actual production of chipboard, the chipboard is typically 1.22 x 2.44m board, moving on an automated line at a speed of 1.2 m/s. In this embodiment, the transmitting transducer and the receiving transducer are installed on both sides of the wooden board (see fig. 2 for a specific installation diagram), and one transmits and one receives at a distance of about 20 cm. Therefore, in this embodiment, the ultrasonic waves in the transverse 32 channels are designed to be detected once in about 5 ms. Please refer to fig. 3 (in this embodiment, the control unit is a single-chip microcomputer). Referring to fig. 4, the input signal and the output signal can be implemented as follows:
the sensor detects the rising edge, starts detecting the bulge, and finishes detecting after the time T2 (the time T2 is about 2 ms). The T3 time signal is given at the output port. A low level is given if there is no plank or a good plank, and a high level of 1ms is given if there is a bumpy plank. One test is completed in about 3 ms. After the time T4 (about 1ms), the next test is started.
The schematic diagram of the whole system is shown in fig. 5, the single chip outputs the signals received by the corresponding receiving transducers, displays the signals, and determines whether the wood board is bulged or not by analyzing the echo signals in the output signals (wherein, in order to avoid mutual interference between the sensors, the sensors operate according to the 1,2,1,2 … … operation mode or the 1,2,3,1,2,3 … … sequence), specifically as follows:
if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through;
if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges;
and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
Wherein, for the blind area between two adjacent transmitting transducers, the judgment can be carried out by the following modes:
and judging whether the two adjacent receiving transducers have echoes larger than a second preset threshold and smaller than a first preset threshold, and if the two adjacent receiving transducers have echoes larger than the second preset threshold and smaller than the first preset threshold, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges.
Wherein a schematic diagram of adjacent transmitting transducers and receiving transducers is shown in fig. 6.
In the present embodiment, the second preset threshold is 800 mv. Therefore, when the echoes of two adjacent receiving transducers respectively have one echo between 800mv and 2000mv, the bulge in the blind area can be judged, and the bulge detection in the zero blind area is realized.
In this embodiment, it is preferable that two adjacent transmitting transducers are spaced apart by 3.8 cm, and two adjacent receiving transducers are spaced apart by 3.8 cm.
Further, in the present embodiment, it is preferable that the numbers of the transmitting transducers and the receiving transducers are 32 respectively.
Referring to fig. 7, in this embodiment, a wood board bulge detecting system 700 is implemented as follows:
a plank bulge detection system 700, comprising: a transmitting transducer 702, a receiving transducer 703 and a control unit 701;
the transmitting transducers 702 are uniformly arranged on one side of the wood board production line at intervals, and the receiving transducers 703 are uniformly arranged on the other side of the wood board production line at intervals;
the receiving transducer 703 is configured to: receiving the signal sent by the transmitting transducer 702;
the control unit 701 is configured to: calculating the number of echo signals which are greater than a preset threshold value in the signals; and judging whether the wood board bulges or not according to the number of the echo signals larger than the first preset threshold value.
Further, the control unit 701 is further configured to: if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through; if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges; and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
Further, the control unit 701 is further configured to: judging whether two adjacent receiving transducers 703 have echoes larger than a second preset threshold value and smaller than a first preset threshold value, and if two adjacent receiving transducers 703 have echoes larger than the second preset threshold value and smaller than the first preset threshold value, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers 703 is bulged.
Further, two adjacent transmitting transducers 702 are spaced apart by 3.8 cm, and two adjacent receiving transducers 703 are spaced apart by 3.8 cm.
Further, the number of the transmitting transducers 702 and the receiving transducers 703 is 32.
The receiving transducer 703 in the wood board bulge detecting system 700 receives the signal sent by the transmitting transducer 702, and whether the wood board bulges can be determined by determining the number of the echo signals which is greater than a first preset threshold value.
Further, in the blind area between two adjacent transmitting transducers 702, the judgment can also be made by combining the signals of two adjacent probes, that is: judging whether two adjacent receiving transducers 703 have echoes larger than a second preset threshold value and smaller than a first preset threshold value, and if two adjacent receiving transducers 703 have echoes larger than the second preset threshold value and smaller than the first preset threshold value, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers 703 is bulged. And then whether the bulge exists in the blind area is judged, and the zero blind area bulge detection of the wood board is achieved.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (6)
1. A wood board bulge detection method is characterized by comprising the following steps:
the receiving transducer receives the signal sent by the transmitting transducer;
calculating the number of echo signals which are greater than a preset threshold value in the received signals;
judging whether the wood board bulges or not according to the number of the echo signals larger than a first preset threshold value;
the transmitting transducers are uniformly arranged on one side of the wood board production line at intervals, and the receiving transducers are uniformly arranged on the other side of the wood board production line at intervals;
the method comprises the following steps of determining whether the wood board bulges or not according to the number of echo signals larger than a first preset threshold value, and further comprises the following steps:
judging whether echoes which are greater than a second preset threshold value and smaller than a first preset threshold value exist in the signals received by two adjacent receiving transducers or not, and if the echoes which are greater than the second preset threshold value and smaller than the first preset threshold value exist in the signals received by two adjacent receiving transducers, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges;
the method comprises the following steps of determining whether the wood board bulges or not according to the number of echo signals larger than a first preset threshold value, and further comprises the following steps:
if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through;
if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges;
and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
2. The wood board bulge detection method according to claim 1,
the distance between two adjacent transmitting transducers is set to be 3.8 cm, and the distance between two adjacent receiving transducers is set to be 3.8 cm.
3. The wood board bulge detection method according to claim 1,
the number of transmitting transducers and receiving transducers is 32 respectively.
4. A plank bulge detection system, comprising: the device comprises a transmitting transducer, a receiving transducer and a control unit;
the transmitting transducers are uniformly arranged on one side of the wood board production line at intervals, and the receiving transducers are uniformly arranged on the other side of the wood board production line at intervals;
the receiving transducer is configured to: receiving a signal sent by a transmitting transducer;
the control unit is used for: calculating the number of echo signals which are greater than a preset threshold value in the received signals; judging whether the wood board bulges or not according to the number of the echo signals larger than a first preset threshold value;
the control unit is further configured to: judging whether echoes which are greater than a second preset threshold value and smaller than a first preset threshold value exist in the signals received by two adjacent receiving transducers or not, and if the echoes which are greater than the second preset threshold value and smaller than the first preset threshold value exist in the signals received by two adjacent receiving transducers, judging that the wood board corresponding to the blind area between the two adjacent receiving transducers has bulges;
the control unit is further configured to: if the number of the echo signals larger than the first preset threshold is larger than 2, judging that no wood board passes through; if the number of the echo signals larger than the first preset threshold is equal to 1, judging that the wood board does not have bulges; and if the number of the echo signals larger than the first preset threshold value is equal to 0, judging that the wood board has bulges.
5. The wood board bulge detection system according to claim 4,
the distance between two adjacent transmitting transducers is 3.8 cm, and the distance between two adjacent receiving transducers is 3.8 cm.
6. The wood board bulge detection system according to claim 4,
the number of transmitting transducers and receiving transducers is 32 respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910271533.6A CN109932424B (en) | 2019-04-04 | 2019-04-04 | Method and system for detecting wood board bulge |
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| CN201910271533.6A CN109932424B (en) | 2019-04-04 | 2019-04-04 | Method and system for detecting wood board bulge |
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| CN109932424A CN109932424A (en) | 2019-06-25 |
| CN109932424B true CN109932424B (en) | 2021-09-03 |
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| CN208520812U (en) * | 2018-04-18 | 2019-02-19 | 湖南诚德木结构股份有限公司 | Wood nondestructive testing device |
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2019
- 2019-04-04 CN CN201910271533.6A patent/CN109932424B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1893992B1 (en) * | 2005-06-17 | 2011-09-21 | Maquet Critical Care AB | Provision of a gas measurement chamber for ultrasound measurements with reduced temperature influence |
| CN104502455A (en) * | 2014-12-31 | 2015-04-08 | 苏州博昇科技有限公司 | Air coupling ultrasonic automatic detection system |
| CN106124625A (en) * | 2016-06-23 | 2016-11-16 | 西南大学 | Air Coupling ultrasound wave high energy detection method and system |
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