CN103185745A - Device for board length detection - Google Patents
Device for board length detection Download PDFInfo
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- CN103185745A CN103185745A CN2011104511515A CN201110451151A CN103185745A CN 103185745 A CN103185745 A CN 103185745A CN 2011104511515 A CN2011104511515 A CN 2011104511515A CN 201110451151 A CN201110451151 A CN 201110451151A CN 103185745 A CN103185745 A CN 103185745A
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Abstract
The invention discloses a device for board length detection. The device comprises a test board consisting of a support frame and a board table, the board table is disposed on the support frame; a rotary encoder is installed on one side of the board length motion direction by a fixing device arranged on the board table; the rotary encoder is connected to a signal regulating module; and the signal regulating module is connected to a computer through an acquisition card. The detection means meets the requirements for the length detection in nondestructive detection of woods, has significant meaning for nondestructive on-line detection of the strength of artificial boards, and is a very important means for increasing utilization rate of the artificial boards.
Description
Technical field
The present invention relates to fields of measurement, particularly relate to a kind of device of sheet material length detection.
Background technology
With the raising of timber demand amount, adopt wood-based plate to replace the log sawn timber to become one of effective ways that efficiently utilize timber resources.The advantage of wood-based plate is: breadth is big, and is structural good, easy construction; The expansion shrinkage factor is low, dimensionally stable, and material is even than sawn timber, is difficult for strain cracking; Be easy to dipping as the veneer of raw material of artifical plate and various particle, thereby can make various functional processing (as fire-retardant, anticorrosion, nonshrink, wear-resisting etc.); Thickness level and the densimetric fraction applicability of wider range are strong; The brake forming performance is better than sawn timber.The shortcoming of wood-based plate is that glue-line can wear out, and the long-time bearing ability has great importance so wood-based plate intensity be can't harm online detection, also is means of crucial importance that improve the wood-based plate utilization factor.Timber detects inconvenience in the prior art, and the defective that detection efficiency is low at present, does not also have the online real-time checkout equipment of timber mechanics intensity in China.
Summary of the invention
Technical matters to be solved by this invention provides the sheet material length detection in a kind of sheet material lossless detection method and the device, this sheet material lossless detection method has solved the existing timber of prior art and has detected inconvenient, the defective that detection efficiency is low, and can carry out the division of grade to its detected sheet material.The present invention utilizes ultrasound wave and the realization of other detection meanss to the Non-Destructive Testing of timber, and there is important value in timber Non-Destructive Testing field.
Principle of work:
According to " through transmission technique " or be transmission beam method, namely with transmitting transducer emission pulsed ultrasonic wave, allow ultrasound wave in the timber that detects, propagate, received by receiving transducer then.The ultrasonic signal that is received is converted into electric signal, carries out sending in the single-chip microcomputer after signal is handled through the ultrasound wave receiving circuit again, can calculate the time of ultrasound wave in sheet material, in basis
V
Speed=L/T (1)
The length of L---sheet material in the formula (1)
The travel-time of T--ultrasound wave in sheet material
V
Speed--the velocity of propagation of ultrasound wave in sheet material
Ev=ρ V
Speed 2, (2)
The Ev--sheet material dynamic modulus of elasticity in the formula (2)
ρ--sheet material average density
ρ=M/V
Body(3)
The quality of M--sheet material in the formula (3)
V
BodyThe volume of one sheet material
V
Body=L*W*H (4)
The length of L one sheet material in the formula (4)
The width of W one sheet material
The thickness of H one sheet material
Draw the dynamic modulus of elasticity of sheet material according to (1), (2), (3), (4):
Again because the positive correlation of the mechanical strength of elastic modulus and sheet material is being divided different plates corresponding grade.
Be the sheet material length detection in achieving the above object, the present invention is achieved through the following technical solutions:
The invention discloses a kind of device of sheet material length detection, this device comprises:
By the test board that bracing frame and table top constitute, bracing frame is provided with table top;
The stationary installation that rotary encoder is provided with by the table top side is installed in a side of sheet material length direction of motion;
The signal condition module that rotary encoder is connected to, this signal condition module is connected to computing machine through capture card.
In said apparatus, described table top has the sheet material connecting gear, comprise with surface level in angled travelling belt, motor, roller;
Wherein, described motor drives driving-belt by roller.
In said apparatus, described rotary encoder is two-way output, the pulse of two paths of signals phase differential 90 degree of output.
Described signal condition module comprises two input ends and two output signals;
Described two input ends connect the two paths of signals of described rotary encoder output respectively;
Described two output signals comprise a count output signal and a rotating output signal, and the parallel capture card that connects is connected to computing machine.
In said apparatus, described signal condition module comprises phase discriminator, the first conditioning circuit that counting circuit is identical with two;
Wherein, the described circuit of conditioning just comprises the photoelectric isolating circuit that connects successively and the pulse shaping circuit that is made of NAND gate circuit;
Described phase discriminator comprises d type flip flop and the power driving circuit that connects successively;
Two input ends of described signal condition module are the input ends of 2 photoelectric isolating circuits in the described circuit of conditioning just;
The output terminal of conditioning circuit connects pulse ends and the input end of d type flip flop in the described phase discriminator respectively at the beginning of described two;
Described counting circuit comprises NAND gate circuit and the power driving circuit that connects successively;
Wherein, the power driving circuit in the described counting circuit is two identical circuit with power driving circuit in the described phase discriminator;
Described phase discriminator output rotating output signal;
Described counting circuit output count output signal.
Therefore, the device of a kind of sheet material length detection among the present invention, can realize utilizing ultrasound wave and other detection meanss realize in the Non-Destructive Testing of timber to the requirement of length detection, wood-based plate intensity being can't harm online detection have great importance, also is means of crucial importance that improve the wood-based plate utilization factor.
Description of drawings
Fig. 1 is the system chart of the sheet material lossless detection method in the embodiment of the invention;
Fig. 2 is the synoptic diagram of the sheet material length-measuring appliance in the embodiment of the invention;
Fig. 3 is the signal condition module circuit diagram in the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The specific implementation of the device of sheet material Non-Destructive Testing is provided in the embodiment of the invention, and Fig. 1 is the system chart of the sheet material lossless detection method in the embodiment of the invention, as shown in Figure 1, comprises the following aspects:
1. the device 101 that detects of sheet metal thickness is used for the thickness of sheet material measurement.The measurement of thickness mainly is the subtle change amount of measuring thickness, and each batch thickness of timber in factory is all roughly the same, can be expressed as (W+ Δ w).At first this standard volume is made as W, only need to measure the variation delta w (Δ w has positive and negative branch) of each piece timber and standard value, by the fixing distance of given a pair of displacement transducer, when thickness changes, the amount of compressing into of displacement transducer changes, by signal conditioning circuit, signal is adopted in the controller, thereby carried out THICKNESS CALCULATION.
2. the device 102 of sheet material length detection.Fig. 2 is the synoptic diagram of the sheet material length-measuring appliance in the embodiment of the invention.This device comprises: by the test board that bracing frame and table top constitute, bracing frame is provided with table top, and this table top has the sheet material connecting gear, comprise with surface level in angled travelling belt, motor, roller; Wherein, motor drives driving-belt by roller; The stationary installation that rotary encoder is provided with by the table top side is installed in a side of sheet material length direction of motion; Rotary encoder 201 is connected to signal condition module 202, and this signal condition module 202 is connected to computing machine 204 through capture card 203.
This rotary encoder 201 is two-way output, the pulse of two paths of signals phase differential 90 degree of its output.Signal condition module 202 comprises two input ends and two output signals, two input ends connect the two paths of signals of described rotary encoder output respectively, two output signals comprise a count output signal and a rotating output signal, and the parallel capture card that connects is connected to computing machine.
The output terminal of conditioning circuit connects pulse ends and the input end of d type flip flop in this phase discriminator respectively at the beginning of these two; This counting circuit comprises NAND gate circuit and the power driving circuit that connects successively; Wherein, the power driving circuit in this counting circuit is two identical circuit with power driving circuit in this phase discriminator; This phase discriminator output rotating output signal; This counting circuit output count output signal.
Its embodiment is: when system travels forward by sheet material and the friction force of rotary encoder come the motion of driven rotary scrambler, the number of turns of driven rotary scrambler motion obtains the length of sheet material when walking by sheet material measurement.Fig. 3 is signal condition module circuit diagram in the device of sheet material length detection in the embodiment of the invention, as shown in Figure 3,
The rotary encoder pulse is added on the switching tube base stage by resistance after photoelectricity is isolated, the switching tube grounded emitter, and collector connects and draws resistance output; Simultaneously phase discriminator mainly is made of d type flip flop, is input as the A of the rotary encoder after the processing, the B two-phase.Because of when rotary encoder just changes, A is 90 ° mutually of leading B all the time, and when rotary encoder reverses, and B is 90 ° of A phases in advance all the time, so can adopt d type flip flop to realize the effect of phase demodulation.When just changeing, phase discriminator output high level, during counter-rotating, output low level.The output of impulse output circuit and phase discriminator inserts after long line transmission in the counting mouth and numeral mouth of data collecting card.Can draw the length of sheet material by the pulse number multiplication by constants of remembering.Constant=(with the girth of the rotary encoder of sheet material touch scrolling)/rotary encoder yardage wherein.
3. after the long end of thickness measuring and survey, arrival is surveyed wide, the static measurement platform of check weighing and velocity of wave, and comprising apparatus for measuring quality 103, width of measuring device 104 and time measurement device 105.The present invention considers the correlative factors such as performance of stressed and LOAD CELLS of objective condition, the rack section of industry spot, adopted the mode of static measurement, after sheet material arrives, behind the static measurement platform, send signal by photoelectric sensor, begin the weighing-up wave of sampling.Repeatedly measure and average to improve the precision of measurement.Because the signal of LOAD CELLS collection is current signal, thus through long line transmission back direct send into after by electric current time variant voltage modulate circuit with data collecting card that host computer links to each other in carry out the collection of data.
4. after weight measurement finishes, the measurement of beginning velocity of wave.Wherein, velocity of wave is measured and is comprised sheet material width of measuring device 104 and the measurement mechanism in the hyperacoustic travel-time on Width 105 again.
With the similar mode of thickness measure, the measurement of width also is the subtle change amount of measuring width.By the fixing distance of given a pair of displacement transducer, when width changed, the amount of compressing into of displacement transducer changed.The output signal of displacement transducer inserts single-chip microcomputer after by signal conditioning circuit.
Simultaneously, after single-chip microcomputer receives the ultrasonic measuring signal of transmission of host computer, send pulse signal to the ultrasound wave transtation mission circuit, and start-up time, measurement module picked up counting.The pulse signal that sends sends ultrasound wave through excitation ultrasonic sensor behind the ultrasonic transmit circuit, penetrating sheet material is received behind the signal through ultrasound wave receiving circuit conditioned signal by the ultrasonic sensor of the other end, produce edge signal, make the time measurement module stop timing.Single-chip microcomputer is by reading the time data of timing chip, and simultaneously according to before the width data measured, the data of its measurement and the velocity amplitude that calculates are returned to computing machine.
5. the evaluation unit 106 that comprises data acquisition unit and data processing unit.Among the present invention, data acquisition unit is data collecting card, and data processing unit is host computer.Host computer carries out computing according to the data collecting card data that collect and the several data that processing obtains.According to the elastic modulus that draws sheet material of above-mentioned principle to carry out grade classification.
6. the method in the embodiment of the invention also further comprises display unit 107, be used for to show the measurement result of each measurement mechanism, and the sheet material elastic modulus that calculates according to measurement result and the grade situation of sheet material.
Therefore in technical scheme of the present invention, this device comprises: by the test board that bracing frame and table top constitute, bracing frame is provided with table top; The stationary installation that rotary encoder is provided with by the table top side is installed in a side of sheet material length direction of motion; Rotary encoder is connected to the signal condition module, and described signal condition module is connected to computing machine through capture card.This detection means has realized in the Non-Destructive Testing of timber the requirement of length detection be can't harm online detection to wood-based plate intensity and has great importance, and also is means of crucial importance that improve the wood-based plate utilization factor.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (4)
1. the device of a sheet material length detection is characterized in that, this device comprises:
By the test board that bracing frame and table top constitute, bracing frame is provided with table top;
The stationary installation that the side of rotary encoder by table top is provided with is installed in a side of sheet material length direction of motion;
Rotary encoder is connected to the signal condition module, and described signal condition module is connected to computing machine through capture card.
2. device according to claim 1 is characterized in that,
Described table top has the sheet material connecting gear, comprise with surface level in angled travelling belt, motor, roller;
Wherein, described motor drives driving-belt by roller.
3. device according to claim 1 is characterized in that,
Described rotary encoder is two-way output, the pulse of two paths of signals phase differential 90 degree of output;
Described signal condition module comprises two input ends and two output signals;
Described two input ends connect the two paths of signals of described rotary encoder output respectively;
Described two output signals comprise a count output signal and a rotating output signal, and the parallel capture card that connects is connected to computing machine.
4. device according to claim 3 is characterized in that,
Described signal condition module comprises phase discriminator, the first conditioning circuit that counting circuit is identical with two;
Wherein, the described circuit of conditioning just comprises the photoelectric isolating circuit that connects successively and the pulse shaping circuit that is made of NAND gate circuit;
Described phase discriminator comprises d type flip flop and the power driving circuit that connects successively;
Two input ends of described signal condition module are the input ends of 2 photoelectric isolating circuits in the described circuit of conditioning just;
The output terminal of conditioning circuit connects pulse ends and the input end of d type flip flop in the described phase discriminator respectively at the beginning of described two;
Described counting circuit comprises NAND gate circuit and the power driving circuit that connects successively;
Wherein, the power driving circuit in the described counting circuit is two identical circuit with power driving circuit in the described phase discriminator;
Described phase discriminator output rotating output signal;
Described counting circuit output count output signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104511515A CN103185745A (en) | 2011-12-30 | 2011-12-30 | Device for board length detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104511515A CN103185745A (en) | 2011-12-30 | 2011-12-30 | Device for board length detection |
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| CN103185745A true CN103185745A (en) | 2013-07-03 |
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| CN2011104511515A Pending CN103185745A (en) | 2011-12-30 | 2011-12-30 | Device for board length detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103472006A (en) * | 2013-08-28 | 2013-12-25 | 浙江大学 | Genetically modified rice online detection device |
| CN108298429A (en) * | 2017-12-12 | 2018-07-20 | 湖南百特随车起重机有限公司 | A kind of telescopic arm of crane length sensing device |
| CN115077337A (en) * | 2022-07-01 | 2022-09-20 | 宜春市山腾电子有限公司 | High-precision roller type metering device |
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| CN2845017Y (en) * | 2005-08-23 | 2006-12-06 | 常州潞城传感器有限公司 | Signal analyzer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472006A (en) * | 2013-08-28 | 2013-12-25 | 浙江大学 | Genetically modified rice online detection device |
| CN103472006B (en) * | 2013-08-28 | 2015-11-18 | 浙江大学 | A kind of transgenic rice on-line measuring device |
| CN108298429A (en) * | 2017-12-12 | 2018-07-20 | 湖南百特随车起重机有限公司 | A kind of telescopic arm of crane length sensing device |
| CN115077337A (en) * | 2022-07-01 | 2022-09-20 | 宜春市山腾电子有限公司 | High-precision roller type metering device |
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Application publication date: 20130703 |