CN103185632A - Device for detecting weight of board - Google Patents
Device for detecting weight of board Download PDFInfo
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- CN103185632A CN103185632A CN2011104511178A CN201110451117A CN103185632A CN 103185632 A CN103185632 A CN 103185632A CN 2011104511178 A CN2011104511178 A CN 2011104511178A CN 201110451117 A CN201110451117 A CN 201110451117A CN 103185632 A CN103185632 A CN 103185632A
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Abstract
The invention discloses a device for detecting weight of a board. The device for detecting the weight of the board comprises a test platform which is composed of a supporting frame and a platform surface, wherein the platform surface is arranged on the supporting frame; four weight sensors are installed at the positions of four vertex angles of the board; the weight sensors are connected with corresponding signal conditioning modules, the corresponding signal conditioning modules are connected with acquisition cards in a parallel mode, and the data acquisition cards are connected with a computer. The detection means of the device for detecting the weight of the board achieves the requirements for weight detection in nondestructive testing of timbers, plays a role in conducting the nondestructive online detection to an artificial board, and is an extremely important means for improving a use ratio of the artificial board.
Description
Technical field
The present invention relates to fields of measurement, particularly relate to the device that a kind of panel weight detects.
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 device that panel weight detects in a kind of sheet material lossless detection method, to realize the Non-Destructive Testing of sheet material, solving the existing timber of prior art detects inconvenient, the defective that detection efficiency is low, and can carry out the division of grade to its detected sheet material.
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 one sheet material in the formula (1)
The travel-time of T one ultrasound wave in sheet material
V
SpeedThe velocity of propagation of one ultrasound wave in sheet material
Ev=ρ V
Speed 2, (2)
The Ev one sheet material dynamic modulus of elasticity in the formula (2)
ρ one sheet material average density
ρ=M/V
Body(3)
The quality of M one 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.
For the panel weight in achieving the above object detects, the present invention is achieved through the following technical solutions:
The device that a kind of panel weight detects, this device comprises:
By the test board that bracing frame and table top constitute, bracing frame is provided with table top;
4 weight sensors are installed in 4 corner positions of sheet material;
Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module is parallel to be connected to capture card, and this data collecting card is connected to computing machine.
In said apparatus, described each self-corresponding signal condition module adopts identical circuit form, comprises the pre-amplification circuit that links to each other by successively, low-pass filter circuit, voltage-current converter circuit, current-to-voltage converting circuit.
In said apparatus, described table top has the sheet material connecting gear, comprises travelling belt, motor, roller;
Wherein, described motor drives driving-belt by roller.
In said apparatus, described low-pass filter circuit comprises 4 circuit form is identical but low-pass filter that parameter is different that wherein each wave filter connects in the mode of series connection.
In said apparatus, described voltage-current converter circuit comprises two operational amplifiers and a P type field effect transistor and a N-type field effect transistor; Wherein, the positive input terminal of first operational amplifier is the input end of described voltage-current converter circuit, and the source electrode of P type field effect transistor is the output terminal of described voltage-current converter circuit;
The negative input end of first operational amplifier is connected with ground through pull down resistor with the source electrode of N-type field effect transistor, the output terminal of first operational amplifier is connected with the grid of N-type field effect transistor, the positive input terminal of second operational amplifier is connected with power supply through pull-up resistor with the drain electrode of P type field effect transistor, the negative input end of second operational amplifier is connected with power supply through pull-up resistor with the source electrode of P type field effect transistor, and the output terminal of second operational amplifier is connected with the grid of P type field effect transistor.
Therefore, the device that a kind of panel weight among the present invention detects, can realize utilizing ultrasound wave and the requirement of other detection meanss realizations to weight detecting in the Non-Destructive Testing of timber, 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 weight sensor installation site synoptic diagram in the panel weight measurement mechanism in the embodiment of the invention;
Fig. 3 is the voltage-current converter circuit figure in the embodiment of the invention;
Fig. 4 is the current/voltage 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.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.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 Weight-measuring device 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.
Embodiment is: this Weight-measuring device comprises: by the test board that bracing frame and table top constitute, bracing frame is provided with table top; 4 weight sensors, Fig. 2 are weight sensor installation site synoptic diagram in the panel weight measurement mechanism in the embodiment of the invention, as described in Figure 2, are installed in 4 corner positions of sheet material; Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module is parallel to be connected to capture card, and data collecting card is connected to computing machine.Be weighted summation by the weight that 4 sensors are collected, draw the general assembly (TW) of sheet material.
In said apparatus, described each self-corresponding signal condition module adopts identical circuit form, comprises the pre-amplification circuit that links to each other by successively, low-pass filter circuit, voltage-current converter circuit, current-to-voltage converting circuit.In said apparatus, described table top has the sheet material connecting gear, comprises travelling belt, motor, roller; Wherein, described motor drives driving-belt by roller.In said apparatus, described low-pass filter circuit comprises 4 circuit form is identical but low-pass filter that parameter is different that wherein each wave filter connects in the mode of series connection.
Fig. 3 is the voltage-current converter circuit figure in the embodiment of the invention, as shown in Figure 4:
Voltage-current converter circuit comprises two operational amplifiers and a P-channel field-effect transistor (PEFT) pipe and a N channel field-effect pipe; Wherein, the positive input terminal of first operational amplifier is the input end of described voltage-current converter circuit, and the source electrode of P-channel field-effect transistor (PEFT) pipe is the output terminal of described voltage-current converter circuit;
The negative input end of first operational amplifier is connected with ground through pull down resistor with the source electrode of N channel field-effect pipe, the output terminal of first operational amplifier is connected with the grid of N channel field-effect pipe, the positive input terminal of second operational amplifier is connected with power supply through pull-up resistor with the drain electrode of P-channel field-effect transistor (PEFT) pipe, the negative input end of second operational amplifier is connected with power supply through pull-up resistor with the source electrode of P-channel field-effect transistor (PEFT) pipe, and the output terminal of second operational amplifier is connected with the grid of P-channel field-effect transistor (PEFT) pipe.Can transmit with the long line that is used for site environment gathering the current signal that voltage signal after the conversion be converted to 0～20mA by voltage-current converter circuit.What traditional voltage-current converter circuit adopted is existing integrated chip, but the circuit that designs among the present invention can be realized electric current and voltage conversion purpose, and have better economy.
Fig. 4 is the current/voltage circuit diagram in the embodiment of the invention, and as described in Figure 4, current-to-voltage converting circuit adopts the form of three amplifier differential amplifier circuits.
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, the device that a kind of panel weight detects having been proposed, this device comprises: by the test board that bracing frame and table top constitute, bracing frame is provided with table top; 4 weight sensors are installed in 4 corner positions of sheet material; Each sensor is connected to each self-corresponding signal condition module, the parallel capture card that is connected to of each self-corresponding signal condition module, data collecting card is connected to computing machine, its detection means realize in the Non-Destructive Testing of timber to the requirement of weight detecting, 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.
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 (5)
1. the device that detects of a panel weight 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;
4 weight sensors are installed in 4 corner positions of sheet material;
Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module is parallel to be connected to capture card, and described data collecting card is connected to computing machine.
2. device according to claim 1 is characterized in that, described each self-corresponding signal condition module adopts identical circuit form, comprises the pre-amplification circuit that links to each other by successively, low-pass filter circuit, voltage-current converter circuit, current-to-voltage converting circuit.
3. device according to claim 1 is characterized in that,
Described table top has the sheet material connecting gear, comprises travelling belt, motor, roller;
Described motor drives driving-belt by roller.
4. device according to claim 2 is characterized in that, described low-pass filter circuit comprises 4 circuit form is identical but low-pass filter that parameter is different that wherein each wave filter connects in the mode of series connection.
5. device according to claim 2 is characterized in that,
Described voltage-current converter circuit comprises two operational amplifiers and a P type field effect transistor and a N-type field effect transistor; Wherein, the positive input terminal of first operational amplifier is the input end of described voltage-current converter circuit, and the source electrode of P type field effect transistor is the output terminal of described voltage-current converter circuit;
The negative input end of first operational amplifier is connected with ground through pull down resistor with the source electrode of N-type field effect transistor, the output terminal of first operational amplifier is connected with the grid of N-type field effect transistor, the positive input terminal of second operational amplifier is connected with power supply through pull-up resistor with the drain electrode of P type field effect transistor, the negative input end of second operational amplifier is connected with power supply through pull-up resistor with the source electrode of P type field effect transistor, and the output terminal of second operational amplifier is connected with the grid of P type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104511178A CN103185632A (en) | 2011-12-30 | 2011-12-30 | Device for detecting weight of board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104511178A CN103185632A (en) | 2011-12-30 | 2011-12-30 | Device for detecting weight of board |
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| CN103185632A true CN103185632A (en) | 2013-07-03 |
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| CN2011104511178A Pending CN103185632A (en) | 2011-12-30 | 2011-12-30 | Device for detecting weight of board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108168622A (en) * | 2018-03-16 | 2018-06-15 | 桂林师范高等专科学校 | Lumber quality detecting system |
| CN112798087A (en) * | 2020-12-24 | 2021-05-14 | 武汉龙发包装有限公司 | Corrugated paper weighing error identification method and weighing equipment applying same |
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| CN101261851A (en) * | 2007-03-09 | 2008-09-10 | 普诚科技股份有限公司 | Control device and method for CD drive skip layer |
| CN201233548Y (en) * | 2008-07-25 | 2009-05-06 | 深圳市远望谷信息技术股份有限公司 | Voltage-current conversion circuit |
| CN201449246U (en) * | 2009-07-07 | 2010-05-05 | 苏州工业园区瑞新自动化设备有限公司 | Non-contact type silicon wafer thickness measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168622A (en) * | 2018-03-16 | 2018-06-15 | 桂林师范高等专科学校 | Lumber quality detecting system |
| CN112798087A (en) * | 2020-12-24 | 2021-05-14 | 武汉龙发包装有限公司 | Corrugated paper weighing error identification method and weighing equipment applying same |
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Application publication date: 20130703 |