CN202734772U - Device for detecting the thickness of plates - Google Patents
Device for detecting the thickness of plates Download PDFInfo
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- CN202734772U CN202734772U CN 201220183284 CN201220183284U CN202734772U CN 202734772 U CN202734772 U CN 202734772U CN 201220183284 CN201220183284 CN 201220183284 CN 201220183284 U CN201220183284 U CN 201220183284U CN 202734772 U CN202734772 U CN 202734772U
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Abstract
The utility model discloses a device for detecting the thickness of plates. The device comprises: a test bench composed of a support frame and a bench top arranged on the support frame; six thickness sensors divided into three groups, wherein two thickness sensors in each group are respectively mounted on the two sides of the thickness direction of the plate and on a same straight line by a fixing device corresponding with each thickness sensor and arranged on the bench top; the thickness sensors of the groups on the same side are arranged on the direction perpendicular with the thickness direction of the plate and on the same straight line; each sensor is connected with a signal conditioning module corresponding with the sensor, the corresponding signal conditioning modules are in parallel connection with a collection card, and the data collection card is connected with a computer. The plant practice proves that: the requirement for thickness detection in the non-destructive detection of woods is realized by ultrasonic wave and other detection means, the device has important significance on non-destructive detection of the strength of man-made plates, and also is a very important means for improving the utilization rate of the man-made plates.
Description
Technical field
The present invention relates to fields of measurement, particularly relate to the device that a kind of sheet metal thickness 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 large, and is structural good, easy construction; Rate of expand to shrink 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; Brake forming Performance Ratio sawn timber is good.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 the detection, also is means of crucial importance that improve the wood-based plate utilization factor.
The present invention utilizes ultrasound wave and the realization of other detection meanss to the Non-Destructive Testing of timber, and the timber field of non destructive testing is had important reference value.
Summary of the invention
Technical matters to be solved by this invention provides a kind of sheet material lossless detection method and device, and solve the existing timber of prior art and detect inconvenience, the defective that detection efficiency is low, and can carry out the division of grade to its sheet material that detects.
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, then received by receiving transducer.The ultrasonic signal that is received is converted into electric signal, again through ultrasonic amplifier amplification, bandpass filter, automatic gain process, thresholding sends in the single-chip microcomputer after relatively, can calculate the time of ultrasound wave in sheet material, according to following formula:
V
Speed=L/T (1)
L refers to the length of sheet material in the formula (1); T refers to the travel-time of ultrasound wave in sheet material; V
SpeedRefer to the velocity of propagation of ultrasound wave in sheet material.
Ev=ρ V
Speed 2, (2)
Ev refers to the sheet material dynamic modulus of elasticity in the formula (2); ρ refers to the sheet material average density.
ρ=M/V
Body(3)
M refers to the quality of sheet material in the formula (3); V
BodyRefer to the volume of sheet material.
V
Body=L*W*H (4)
L refers to the length of sheet material in the formula (4); W refers to the width of sheet material; H refers to the thickness of sheet material.
According to (1), (2), (3), (4), draw the dynamic modulus of elasticity of sheet material:
Again because the positive correlation of the mechanical strength of elastic modulus and sheet material is being divided different plates corresponding grade.
For the sheet metal thickness in achieving the above object detects, the present invention is achieved through the following technical solutions:
The invention discloses the device that a kind of sheet metal thickness detects, this device comprises:
Test board by bracing frame and table top consist of is provided with table top on the bracing frame;
Be divided into 6 thickness transducers of three groups, stationary installation corresponding to each thickness transducer that be provided with by table top respectively of two thickness transducers in each group makes it be installed in both sides on the sheet metal thickness direction, and is positioned at same straight line; The thickness transducer of the same side is located along the same line at vertical sheet material thickness direction between group;
Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module parallel join is to capture card, and data collecting card is connected to computing machine.
In said apparatus, described thickness transducer is measuring junction with guide wheel and is built-in with the displacement transducer of spring.
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, comprise with surface level in angled 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, and 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 the 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 the 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 the first operational amplifier is connected with the grid of N-type field effect transistor, the positive input terminal of the 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 the 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 the second operational amplifier is connected with the grid of P type field effect transistor.
Therefore, the device that a kind of sheet metal thickness among the present invention detects, can realize utilizing ultrasound wave and other detection meanss to realize the requirement that thickness in the Non-Destructive Testing of timber is detected, wood-based plate intensity being can't harm online the 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 device schematic diagram that the sheet metal thickness in the embodiment of the invention detects;
Fig. 2 is the voltage-current converter circuit in the embodiment of the invention;
Fig. 3 is the current-to-voltage converting circuit 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, has comprised the following aspects:
1. the device that detects of sheet metal thickness is used for the thickness of sheet material measurement.The measurement of thickness mainly is the change of detect thickness, and the thickness of every a collection 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 dividing) 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 controller, thereby carried out THICKNESS CALCULATION.In the sheet material moving process, the multiple dynamic measurement of thickness measuring system and the record of data are opened, are finished in the sudden change that arrives, leaves the thickness measuring displacement transducer that the measuring thickness device place causes by sheet material.Measure the data of many groups, remove maximum and last look, data are got average, draw the average thickness of sheet material.The signal that thickness gathers behind signal condition, directly send into data collecting card that host computer links to each other in, draw the thickness of sheet material.
Fig. 1 is the device schematic diagram that the sheet metal thickness in the embodiment of the invention detects, and as shown in Figure 1, this device comprises: the test board by bracing frame and table top consist of is provided with table top on the bracing frame; Be divided into 6 thickness transducers of three groups, stationary installation corresponding to each thickness transducer that be provided with by table top respectively of two thickness transducers in each group makes it be installed in both sides on the sheet metal thickness direction, and is positioned at same straight line; The thickness transducer of the same side is located along the same line at vertical sheet material thickness direction between group; Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module parallel join is to capture card, and data collecting card is connected to computing machine.Wherein, table top has the sheet material connecting gear, comprises travelling belt, motor, and roller, motor drives driving-belt by roller.Thickness transducer is measuring junction with guide wheel and is built-in with the displacement transducer of spring.
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.Wherein, low-pass filter circuit comprises 4 circuit form is identical but low-pass filter that parameter is different, and wherein each wave filter connects in the mode of series connection.Voltage-current converter circuit comprises two operational amplifiers and a P type field effect transistor and a N-type field effect transistor; Fig. 2 is the voltage-current converter circuit in the embodiment of the invention, as shown in Figure 2, in voltage-current converter circuit, the positive input terminal of the first operational amplifier is the input end of voltage-current converter circuit, and the source electrode of P type field effect transistor is the output terminal of voltage-current converter circuit; The negative input end of the first operational amplifier is connected with ground through pull down resistor with the source electrode of N-type field effect transistor, and output terminal is connected with the grid of N-type field effect transistor; The positive input terminal of the second operational amplifier is connected with power supply through pull-up resistor with the drain electrode of P type field effect transistor, and negative input end is connected with power supply through pull-up resistor with the source electrode of P type field effect transistor, and output terminal is connected with the grid of P type field effect transistor.
2. the device of sheet material length detection.In measurement of length, when system can travel 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.In the counting mouth and numeral mouth of the output of impulse output circuit and phase discriminator access data capture card after long line transmission.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, width of measuring device and time measurement device.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 after long line transmission, send into after directly by electric current time variant voltage modulate circuit with data collecting card that host computer links to each other in carry out data acquisition.
4. after weight measurement finishes, the measurement of beginning velocity of wave.Wherein, velocity of wave is measured and is comprised again sheet material width measure and the measurement in the hyperacoustic travel-time on Width.
With the similar mode of thickness measure, the measurement of width also is the change 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 accesses single-chip microcomputer after by signal conditioning circuit.
Simultaneously, after single-chip microcomputer receives the ultrasonic measuring signal of transmission of host computer, to ultrasound wave transtation mission circuit transmitted signal, and start the timing chip and begin timing.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 timing chip 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 industrial computer.
5. the evaluation unit 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, 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, the device that a kind of sheet metal thickness among the present invention detects, can realize utilizing ultrasound wave and other detection meanss to realize the requirement that thickness in the Non-Destructive Testing of timber is detected, wood-based plate intensity being can't harm online the 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 (4)
1. the device that sheet metal thickness detects is characterized in that, this device comprises:
Test board by bracing frame and table top consist of is provided with table top on the bracing frame;
Be divided into 6 thickness transducers of three groups, stationary installation corresponding to each thickness transducer that two thickness transducers in each group are provided with by table top respectively is installed in the both sides on the sheet metal thickness direction, and is positioned at same straight line; The thickness transducer of the same side is located along the same line at vertical sheet material thickness direction between group;
Each sensor is connected to each self-corresponding signal condition module, and described each self-corresponding signal condition module parallel join is to capture card, and described data collecting card is connected to computing machine,
Described table top has the sheet material connecting gear, comprises travelling belt, motor, roller;
Wherein, described motor drives driving-belt by roller, and described thickness transducer is measuring junction with guide wheel and is built-in with the displacement transducer of spring.
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 2 is characterized in that, described low-pass filter circuit comprises 4 circuit form is identical but low-pass filter that parameter is different, and wherein each wave filter connects in the mode of series connection.
4. 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 the 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 the first operational amplifier is connected with ground through pull down resistor with the source electrode of N-type field effect transistor, and output terminal is connected with the grid of N-type field effect transistor; The positive input terminal of the second operational amplifier is connected with power supply through pull-up resistor with the drain electrode of P type field effect transistor, and negative input end is connected with power supply through pull-up resistor with the source electrode of P type field effect transistor, and output terminal is connected with the grid of P type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220183284 CN202734772U (en) | 2012-04-27 | 2012-04-27 | Device for detecting the thickness of plates |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220183284 CN202734772U (en) | 2012-04-27 | 2012-04-27 | Device for detecting the thickness of plates |
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| CN202734772U true CN202734772U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220183284 Expired - Fee Related CN202734772U (en) | 2012-04-27 | 2012-04-27 | Device for detecting the thickness of plates |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772348A (en) * | 2015-04-02 | 2015-07-15 | 浙江大学 | Online sheet thickness detecting and adjusting system based on laser ultrasonic |
| CN106092001A (en) * | 2016-08-16 | 2016-11-09 | 武汉华星光电技术有限公司 | The measuring method of sealed plastic box width and measurement apparatus |
| CN108168622A (en) * | 2018-03-16 | 2018-06-15 | 桂林师范高等专科学校 | Lumber quality detecting system |
-
2012
- 2012-04-27 CN CN 201220183284 patent/CN202734772U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772348A (en) * | 2015-04-02 | 2015-07-15 | 浙江大学 | Online sheet thickness detecting and adjusting system based on laser ultrasonic |
| CN104772348B (en) * | 2015-04-02 | 2017-01-04 | 浙江大学 | A kind of sheet metal thickness on-line checking based on laser-ultrasound and the system of adjustment |
| CN106092001A (en) * | 2016-08-16 | 2016-11-09 | 武汉华星光电技术有限公司 | The measuring method of sealed plastic box width and measurement apparatus |
| CN106092001B (en) * | 2016-08-16 | 2019-06-07 | 武汉华星光电技术有限公司 | The measurement method and measuring device of sealant width |
| CN108168622A (en) * | 2018-03-16 | 2018-06-15 | 桂林师范高等专科学校 | Lumber quality detecting system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20140427 |