CN202533055U - Plate width detection device - Google Patents
Plate width detection device Download PDFInfo
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- CN202533055U CN202533055U CN2012201832425U CN201220183242U CN202533055U CN 202533055 U CN202533055 U CN 202533055U CN 2012201832425 U CN2012201832425 U CN 2012201832425U CN 201220183242 U CN201220183242 U CN 201220183242U CN 202533055 U CN202533055 U CN 202533055U
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Abstract
The utility model discloses a plate width detection device. The plate width detection device comprises: a test table which is composed of a fixing seat and a table top, and four width sensors which are divided into two groups, wherein the table top is arranged in the front of the fixing seat, two width sensors in each group are respectively mounted at both sides in a plate width direction through fixing devices corresponding to each width sensor arranged on the table top and are on a line, the width sensors at a same side between two groups are located on a line in a vertical plate width direction, each width sensor is connected with a corresponding signal conditioning module, the corresponding signal conditioning modules are connected with a single chip microcomputer in parallel, and the single chip microcomputer is connected with a computer through serial ports. Approved by factory practices, the plate width detection device can meet width detection requirements in a nondestructive plate detection process by utilizing ultrasonic wave detection means and other detection means, has great importance to nondestructive on-line detection of man-made plate strength and is a greatly important tool for improving a utilization rate of man-made plates.
Description
Technical field
The present invention relates to field of measurement, particularly relate to a kind of device of sheet material width 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.); The 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 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 timber mechanics intensity online in real time checkout equipment in China.
Summary of the invention
Technical matters to be solved by this invention provides the device of sheet material width detection 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, promptly, let ultrasound wave in the timber that is detected, propagate with transmitting transducer emission pulsed ultrasonic wave, receive by receiving transducer then.The ultrasonic signal that is received is converted into electric signal, after the ultrasound wave receiving circuit carries out signal Processing, sends in the single-chip microcomputer 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.
Be the detection of the sheet material width in achieving the above object, the present invention realizes through following technical scheme:
The invention discloses a kind of device of sheet material width detection, this device comprises:
Test board by holder and table top constitute is provided with table top before the holder;
Be divided into 4 width sensors of two groups, two width sensors in each group are installed in the both sides on the sheet material Width through the corresponding stationary installation of each width sensor that table top is provided with respectively, and are positioned at same straight line; The thickness transducer of the same side is positioned on the same straight line on vertical sheet material width degree direction between group;
Each sensor is connected to each self-corresponding signal condition module, and said each self-corresponding signal condition module is parallel to be connected to single-chip microcomputer, and single-chip microcomputer is connected to computing machine through serial ports again.
In said apparatus, said width sensor is the displacement transducer that is built-in with spring.
In said apparatus, said each self-corresponding signal condition module adopts identical circuit form, comprises the preposition instrument amplifying circuit that links to each other successively; Eight rank low-pass filter circuits; Voltage-current converter circuit, current-to-voltage converting circuit, A/D convertor circuit, single-chip microcomputer Acquisition Circuit.
In said apparatus, the stationary installation of said each width sensor correspondence on the sheet material Width, can deviate from the sheet material motion by air cylinder driven.
In said apparatus, described eight rank low-pass filter circuits comprise 4 circuit form are identical but low-pass filter that parameter is different that wherein each wave filter connects with the mode of series connection.
In said apparatus, described 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 said 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.
In said apparatus, described current-to-voltage converting circuit adopts the form of three amplifier differential amplifier circuits.
Therefore; The device of a kind of sheet material width 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 width 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 sensor installation site synoptic diagram of the sheet material width of measuring device in the embodiment of the invention;
Fig. 3 is one group of width measure system schematic in the sheet material width of measuring device in the embodiment of the invention;
Fig. 4 is the voltage-current converter circuit figure in the embodiment of the invention;
Fig. 5 is the current/voltage circuit diagram in the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
The concrete realization 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, and is 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 a 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, through the fixing distance of given a pair of displacement transducer, when thickness changes; The amount of compressing into of displacement transducer changes; Through signal conditioning circuit, signal is adopted in the controller, thereby carried out THICKNESS CALCULATION.
2. the device 102 of sheet material length detection.In measurement of length, when system can travel forward through sheet material and the motion that comes the driven rotary scrambler of the friction force of rotary encoder, the number of turns of driven rotary scrambler motion obtains the length of sheet material when walking through sheet material measurement.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 through 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 thickness measuring finished with survey length, arrival was 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, begin the weighing-up wave of sampling by photoelectric sensor.Repeatedly measure the precision of averaging and measuring to improve.Because of the signal of LOAD CELLS collection is a current signal, thus through long line transmission back direct send into after through electrorheological 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 a subtle change amount of measuring width.Through 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 through signal conditioning circuit.
Wherein, the sheet material width of measuring device comprises the test board that is made up of holder and table top, is provided with table top before the holder; Be divided into 4 width sensors of two groups; Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module is parallel to be connected to single-chip microcomputer, and single-chip microcomputer is connected to computing machine through serial ports again.Width sensor is the displacement transducer that is built-in with spring.Its corresponding stationary installation on the sheet material Width, can deviate from the sheet material motion by air cylinder driven.
Fig. 2 is the sensor installation site synoptic diagram of the sheet material width of measuring device in the embodiment of the invention; Of Fig. 2; Two width sensors in each group are installed in the both sides on the sheet material Width through the corresponding stationary installation of each width sensor that table top is provided with respectively, and are positioned at same straight line; The thickness transducer of the same side is positioned on the same straight line on vertical sheet material width degree direction between group.
Fig. 3 is one group of width measure system schematic in the sheet material width of measuring device in the embodiment of the invention, and is as shown in Figure 3, and the signal condition module that displacement transducer is corresponding separately adopts identical circuit form; Comprise the preposition instrument amplifying circuit that links to each other successively; Low-pass filter circuit, voltage-current converter circuit, current-to-voltage converting circuit; Analog switch, A/D convertor circuit, single-chip microcomputer Acquisition Circuit.Because the signal of two sensor acquisition in every group will be sent into the calculating of carrying out width in the single-chip microcomputer, therefore, need be applied to analog switching circuit and realize sampling in batches handling signal later.
Wherein, what low-pass filter circuit adopted is eight rank low-pass filter circuits, and it comprises 4 circuit form is identical but low-pass filter that parameter is different that wherein each wave filter connects with the mode of series connection.
Fig. 4 is the voltage-current converter circuit figure in the embodiment of the invention, and is 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 said 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 convert 0～20mA into through voltage-current converter circuit.What the traditional voltage current converter circuit adopted is existing integrated chip, but designed circuit among the present invention can realize electric current and voltage conversion purpose, and have better economy.
Fig. 5 is the current/voltage circuit diagram in the embodiment of the invention, and is of Fig. 5, and current-to-voltage converting circuit adopts the form of three amplifier differential amplifier circuits.
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 through reading the time data of timing chip, and simultaneously according to before the width measured data, its data measured 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 a data collecting card, and data processing unit is a host computer.Host computer carries out computing according to 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, is used 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 of a kind of sheet material width 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 width 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.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (5)
1. the device of a sheet material width detection is characterized in that, this device comprises:
Test board by holder and table top constitute is provided with table top before the holder;
Be divided into 4 width sensors of two groups, two width sensors in each group make it be installed in the both sides on the sheet material Width through the corresponding stationary installation of each width sensor that table top is provided with respectively, and are positioned at same straight line; The thickness transducer of the same side is positioned on the same straight line on vertical sheet material width degree direction between group;
Each sensor is connected to each self-corresponding signal condition module, and each self-corresponding signal condition module is parallel to be connected to single-chip microcomputer, and single-chip microcomputer is connected to computing machine through serial ports again; Said width sensor is the displacement transducer that is built-in with spring, and said each self-corresponding signal condition module adopts identical circuit form, comprises the preposition accurate amplifying circuit that links to each other successively; Eight rank low-pass filter circuits; Voltage-current converter circuit, current-to-voltage converting circuit, A/D convertor circuit, single-chip microcomputer Acquisition Circuit.
2. device according to claim 1 is characterized in that,
The stationary installation of said each width sensor correspondence on the sheet material Width, can deviate from the sheet material motion by air cylinder driven.
3. device according to claim 1 is characterized in that, described eight rank low-pass filter circuits comprise 4 circuit form is identical but low-pass filter that parameter is different that wherein each wave filter connects with the mode of series connection.
4. device according to claim 1 is characterized in that,
Described 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 said 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.
5. device according to claim 1 is characterized in that described current-to-voltage converting circuit adopts the form of three amplifier differential amplifier circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201832425U CN202533055U (en) | 2012-04-27 | 2012-04-27 | Plate width detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201832425U CN202533055U (en) | 2012-04-27 | 2012-04-27 | Plate width detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533055U true CN202533055U (en) | 2012-11-14 |
Family
ID=47134233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201832425U Expired - Fee Related CN202533055U (en) | 2012-04-27 | 2012-04-27 | Plate width detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202533055U (en) |
-
2012
- 2012-04-27 CN CN2012201832425U patent/CN202533055U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20121114 Termination date: 20130427 |