CN102506792B - Method and device for measuring thickness of slab of medium density fiberboard - Google Patents
Method and device for measuring thickness of slab of medium density fiberboard Download PDFInfo
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- CN102506792B CN102506792B CN201110326389.5A CN201110326389A CN102506792B CN 102506792 B CN102506792 B CN 102506792B CN 201110326389 A CN201110326389 A CN 201110326389A CN 102506792 B CN102506792 B CN 102506792B
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Abstract
The invention relates to a method and device for measuring the thickness of a slab of a medium density fiberboard. An incremental rotary encoder is arranged on an encoder bracket with an adjustable height. An oscillating bar is fixed on a rotor shaft of the rotary encoder. A roller is arranged at the other end of the oscillating bar; the oscillating bar has the length of R. An initial position of the oscillating bar is regulated to a vertical state by regulating the height of the encoder bracket; the lowermost point of the roller is just in contact with the surface of a conveyor belt; an angular displacement output by the rotary encoder in the state is set to be zero; when the roller is pushed by the slab to drive the oscillating bar to swing by an angle alpha, the rotor shaft of the rotary encoder rotates along with the oscillating bar, an angular displacement pulse signal is output, is acquired by a data acquisition card, is input into a computer and is processed by data processing software, and the thickness H of the slab is calculated by utilizing the formula H=R(1-cos alpha); and the thickness value of the slab is displayed and output in real time. The device has the advantages of high measurement accuracy and low cost and is convenient to use.
Description
Technical field
The invention belongs to object thickness field of measuring technique, relate to a kind of sheet metal thickness measuring method and device, be specially a kind of for thickness of slab of medium density fiberboard measuring method and device.
Background technology
Medium density fibre board (MDF) be utilize the raw material such as undersized log, brush wood and wood machining residues through chipping, a kind of sheet material of processing of the operation such as defibrator process, applying glue, dry, moulding, precompressed, hot pressing, cutting edge, sanding, tool has been widely used.Molding procedure is to adopt machinery or air forming method to mat formation into the continuous slab band of certain width and thickness through applying glue and dried fiber, and the slab after moulding is very fluffy, and thickness is large, density is very low, and impact transportation and slab enter hot press.Therefore, before hot pressing, need slab to carry out precompressed, increase slab density and reduce thickness, to facilitate mat conveyor and to enter hot press.And then the slab thickness after precompressed and weight are carried out to on-line measurement, prevent that underproof slab from entering hot press, density with sheet material after assurance hot pressing reaches quality requirements and avoids hot press to cause damage, particularly particularly important to continuous flat press type hot pressing machine; In addition, carry out real-time online measuring by the slab thickness to after precompressed, can, by slab thickness information Real-time Feedback to mat forming machine, shaping fiber amount be adjusted in real time.
When precompressed, conventionally slab is compressed to the thickness of production board, but due to the elasticity restitution of fiber, after precompressed, the thickness of slab has a rebound, be generally 4 times of left and right of production board thickness, according to the thickness of finished product sheet material and density requirements, after precompressed, the thickness range of slab is 10mm～200mm; Slab density is about 200kg/m
3, there is certain intensity, but its surface being very not smooth bright and clean, slab is also a kind of porous material in addition.
At present, in actual production and experimental study, the On-line Measuring Method of slab thickness after precompressed is mainly contained to the contactless measurements such as laser, ultrasound wave, X ray, and adopt the contact measurement method of Linear displacement transducer.
Contactless measurement can not cause damage to steel slab surface, and because the fiberboard slab after precompressed is a kind of porous material, and production environment exists the impact of the factors such as dust, and above-mentioned several contactless measurements all exist certain defect.
For laser optical method, mainly to adopt laser displacement sensor to realize, have the advantages such as monochromaticity is good, high brightness, high directivity, strong interference immunity due to laser, measuring accuracy is higher, is to apply maximum a kind of slab thickness measuring methods during current medium density fibre board (MDF) is produced.But owing to having fiber and dust in production environment air, laser sensor surface usually can adhering fibre and dust, affects measuring accuracy, sometimes also there will be data wrong report phenomenon, affect on the contrary normally carrying out of producing.In addition, the price of laser displacement sensor is also more expensive.
For ultrasonic Method for Measuring, because fibre mat has a large amount of holes, cause hyperacoustic a large amount of scattering and energy attenuation, make to measure the slab thickness value showing and be significantly less than slab actual (real) thickness value, error is larger, even non-metering.The method is also under test at present, not yet in slab thickness is measured, obtains practical application.
For X-ray measurement method, its principle is that while penetrating slab according to X ray, the damping capacity of intensity is carried out converted measurement thickness, but X ray is in the time penetrating the medium such as different materials and dust, oil smoke, its attenuation degree also can be different, therefore its measuring accuracy is affected by environment larger, also need to carry out temperature compensation, less stable, maintenance and maintenance cost are larger.Therefore, the method be not suitable for the thickness measure of fibre mat.
For the contact measurement method that adopts Linear displacement transducer, Linear displacement transducer is installed perpendicular to tested plate surface, the displacement of measuring staff equals the thickness of sheet material, can directly measure the thickness of sheet material, because measuring staff need to contact with tested sheet material, require tested sheet material to there is larger hardness and brighter and cleaner even curface, the early stage thickness that is mainly used in measuring production board abroad, measure and be difficult to realize for slab thickness softer and that thickness is larger, also be at present the experimental study stage, not yet obtain practical application.
Summary of the invention
In order to solve the problem existing in slab thickness on-line measurement process in current medium density fibre board (MDF) production run, the invention provides a kind of simple in structure, safe and reliable, measuring accuracy is higher, cost is lower, easy to use slab thickness On-line Measuring Method and device.
The present invention solves the technical scheme that its technical matters takes:
(1) adopt incremental-rotating coder, fork, roller, scrambler support etc. to form slab thickness measurement mechanism, incremental-rotating coder is arranged on an adjustable for height scrambler support, fixedly mount a fork on the armature spindle of incremental-rotating coder, the other end of fork is installed a roller that width is larger, fork, roller adopt the light material that density is lower to make, and adopt thin-wall construction, the roller surface polytetrafluoroethylene film of applying ointment or plaster.
(2) adjust scrambler support height, make fork initial position be adjusted to vertical state, and the minimum point of roller is just contacted with conveyer belt surface, the angular displacement signal of the incremental-rotating coder output under this state is set to zero, in the time that slab moves forward with conveyer belt, on pushing rolling wheels, move, drive fork to swing simultaneously, the armature spindle of incremental-rotating coder rotates together, and angle displacement pulse signal.
(3) angular displacement signal of incremental-rotating coder output, by data collecting card Gather and input computing machine, utilizes data processing software diagonal displacement pulse signal to process, and utilizes formula (I) to calculate slab thickness,
H＝R(1-cosα) (I)
In formula (I), the thickness that H is tested slab, R is fork effective length, α is the angle (rotational angle of incremental-rotating coder rotor) that fork swings while departing from plumbness.
(4) show in real time calculating the slab thickness value obtaining, and thickness signal value is exported to hot press slab feed arrangement and mat forming machine.
Tool of the present invention has the following advantages:
(1) the present invention adopts incremental-rotating coder, fork, roller etc. to form slab thickness measurement mechanism, and good stability has overcome laser displacement sensor and has been subject to dust to affect the thickness data wrong report phenomenon of appearance.
(2) fork in the present invention, roller adopt light material to make, and adopt thin-wall construction, roller widths is also larger, simultaneously because the slab after precompressed has some strength, the decrement of pair of rollers steel slab surface is very little, and because roller is wider, measured slab thickness value is the mean value within the scope of roller widths, error is little, and precision is higher.
(3) polytetrafluoroethylene film of having applied ointment or plaster of the roller surface in the present invention, the phenomenon that there will not be fiber to adhere to, can not affect thickness measure precision, simultaneously because roller rolls and also can not cause damage to steel slab surface in steel slab surface.
(4) the cost ratio laser displacement sensor of the incremental-rotating coder adopting in the present invention is much lower, and cost performance is good, uses also very convenient.
(5) slab thickness measuring method provided by the invention and device, can also be applied to the measurement of other sheet metal thickness.
Accompanying drawing explanation
Fig. 1 is the ultimate principle figure of slab thickness measuring method of the present invention.
Fig. 2 is the front view of slab thickness measurement mechanism of the present invention.
Fig. 3 is the side view of slab thickness measurement mechanism of the present invention.
Fig. 4 is the A-A sectional view in slab thickness measurement mechanism Fig. 2 of the present invention.
In Fig. 2, Fig. 3, Fig. 4,1-roller, 2-rolling bearing, 3-nut, 4-spring washer, 5-axle, 6-locating sleeve, 7-be elastic collar, 8-fork, 9-screw, 10-incremental-rotating coder, 11-screw, 12-scrambler support, 13-feather key, 14-screw, 15-screw, 16-adjusting screw(rod), 17-nut, 18-elastic collar, 19-screw, 20-spiro rod support, 21-vertical support frame, 22-screw, 23-base plate, 24-screw for axle for hole.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:
As shown in Figure 1, its course of work is as follows for the ultimate principle of slab thickness measuring method of the present invention:
First, adjust scrambler support height, make fork initial position be adjusted to vertical state, and the minimum point of roller is just contacted with conveyer belt surface, the angular displacement signal of the incremental-rotating coder output under this state is set to zero, in the time that slab moves forward with conveyer belt, on pushing rolling wheels, move, drive fork to swing, the armature spindle of incremental-rotating coder rotates together, and angle displacement pulse signal simultaneously.
Then, the angular displacement pulse signal of incremental-rotating coder output is by data collecting card Gather and input computing machine, utilize data processing software (as LabVIEW) the diagonal displacement pulse signal in computing machine to process, and utilize formula (I) to calculate slab thickness
H＝R(1-cosα) (I)
In formula (I), the thickness that H is tested slab, R is fork effective length, α is the angle (rotational angle of incremental-rotating coder rotor) that fork swings while departing from plumbness.
Show in real time calculating the slab thickness value obtaining by data processing software, and thickness signal value is exported to hot press slab feed arrangement and plate blank paving forming machine, prevent that defective slab from entering hot press, the shaping fiber amount of mat forming machine is adjusted simultaneously.
Slab thickness measurement mechanism of the present invention as Fig. 2, as Fig. 3, as shown in Figure 4.Its chief component comprises: incremental-rotating coder 10, fork 8, roller 1, scrambler support 12, adjusting screw(rod) 16, vertical support frame 21, base plate 23 etc.
Incremental-rotating coder 10 is arranged on scrambler support 12 by screw 9; One end of fork 8 is fixed on by screw 11 on the armature spindle of rotary encoder 10, and roller 1 is arranged on the other end of fork 8 with elastic collar 7 and axle 5 by rolling bearing 2, locating sleeve 6, hole; Fork 8 and roller 1 adopt the lower aluminium alloy plate of density to make, roller 1 adopts wider size (getting 20mm) simultaneously, to alleviate the pressure of roller 1 to steel slab surface, because the slab after precompressed has some strength, so roller 1 is very little to the decrement of steel slab surface, and because roller is wider, measured slab thickness value is the mean value within the scope of roller widths, error is little, and precision is higher; In addition the surface of roller 1 polytetrafluoroethylene film of having applied ointment or plaster, to prevent that fiber from sticking to roller surface, and affects measuring accuracy and destroys the surface of slab; The diameter of roller 1 is measured not impact to slab thickness, but in order to reduce roller 1 rotating speed, roller 1 diameter is suitably got larger, as gets 100mm.In order further to alleviate the weight of fork 8 and roller 1, under the prerequisite of proof strength and rigidity, adopt thin-walled (2mm～3mm) structure.
Scrambler support 12 is fixed on vertical support frame 21 by screw 14, and vertical support frame 21 is fixed on base plate 23 by screw 22, and base plate 23 is fixed on crossbeam by screw 24.
On vertical support frame 21, be installed with feather key 13 by screw 15, have the keyway matching with feather key 13 on scrambler support 12, scrambler support 12 can move up and down along feather key 13.
Spiro rod support 20 is fixed on vertical support frame 21 by screw 19, in the upper end of scrambler support 12, nut 17 is installed, and adjusting screw(rod) 16 is arranged in the hole of spiro rod support 20 in upper end, and the thread segment of bottom coordinates with nut 17; In the time unclamping screw 14, rotation adjusting screw(rod) 16, can drive 12 liftings of scrambler support, to fork 8 is adjusted to vertical state, and the minimum point of roller 1 is just contacted with conveyer belt, then screw 14 is tightened, and fixes scrambler support 12.
In the time that slab moves forward with conveyer belt, on pushing rolling wheels 1, move, drive fork 8 to swing simultaneously, the armature spindle of incremental-rotating coder 10 rotates together, rotary encoder angle displacement pulse signal.
The measuring accuracy of slab thickness measurement mechanism of the present invention, depends primarily on the resolution of incremental-rotating coder, and resolution is higher, and measuring accuracy is higher.Due to the pulse signal of rotary encoder output, so the effective length of fork and the thickness of tested slab also have impact to measuring accuracy.After the resolution of rotary encoder is determined, when fork effective length is short and when tested slab thin thickness, measuring accuracy is higher.The effective length of fork depends on the variation range of the tested slab thickness of medium-density fiberboard production line, in order not make slab and rotary encoder collide, oscillating bar length equals the thickness of tested slab, and in production, the maximum ga(u)ge of slab is 200mm, selects fork effective length R=200mm.The resolution of the incremental-rotating coder of selecting in the present invention is 3600P/R, and the angle of a pulse signal representative of every output is 0.1 °.Within the scope of common thickness of slab of medium density fiberboard 30mm～80mm, measuring accuracy is 0.183mm～0.279mm.If fork effective length R=100mm, within the scope of slab thickness 30mm～80mm, measuring accuracy is 0.087mm～0.139mm.For slab, such thickness measure precision is higher.Show by production practical application, slab thickness measuring method of the present invention can meet with device the requirement that medium density fibre board (MDF) is produced completely.
Claims (4)
1. a thickness of slab of medium density fiberboard measurement mechanism, comprises incremental-rotating coder (10), screw C (9), scrambler support (12), fork (8), screw D (11), roller (1), rolling bearing (2), locating sleeve (6), elastic collar for hole (7), axle (5), nut A (3), screw E (14), adjusting screw(rod) (16), nut B (17), screw G (19), spiro rod support (20), vertical support frame (21), screw H (22), base plate (23), screw L (24), screw F (15), feather key (13), crossbeam, it is characterized in that, incremental-rotating coder (10) is arranged on scrambler support (12) by screw C (9), one end of fork (8) is fixed on the armature spindle of rotary encoder (10) by screw D (11), and roller (1) is by rolling bearing (2), locating sleeve (6), elastic collar for hole (7), axle (5) and nut A (3) are arranged on the other end of fork (8), described scrambler support (12) is fixed on vertical support frame (21) by screw E (14), vertical support frame (21) is fixed on base plate (23) by screw H (22), base plate (23) is fixed on crossbeam by screw L (24), described vertical support frame (21) is upper is installed with feather key (13) by screw F (15), on scrambler support (12), have the keyway matching with feather key (13), and scrambler support (12) can move up and down along feather key (13), described spiro rod support (20) is fixed on vertical support frame (21) by screw G (19), in the upper end of scrambler support (12), nut B (17) is housed, the upper end of adjusting screw(rod) (16) is arranged in the hole of spiro rod support (20), the thread segment of bottom coordinates with nut B (17), in the time unclamping screw 14, rotation adjusting screw(rod) 16, can drive 12 liftings of scrambler support, to fork 8 is adjusted to vertical state, and the minimum point of roller 1 is just contacted with conveyer belt, then screw 14 is tightened, and fixes scrambler support 12, in the time that slab moves forward with conveyer belt, on pushing rolling wheels 1, move, drive fork 8 to swing simultaneously, the armature spindle of incremental-rotating coder 10 rotates together, rotary encoder angle displacement pulse signal.
2. thickness of slab of medium density fiberboard measurement mechanism according to claim 1, is characterized in that, fork (8) and roller (1) adopt aluminium alloy plate to make, and adopt thin-wall construction, and wall thickness is got 2mm～3mm.
3. thickness of slab of medium density fiberboard measurement mechanism according to claim 1, is characterized in that, the width of roller (1) is got 20mm, and the surface polytetrafluoroethylene film of having applied ointment or plaster.
4. a method that adopts thickness of slab of medium density fiberboard measurement mechanism as claimed in claim 1 to measure, is characterized in that, comprises the following steps:
Step 1, unclamp screw E (14), rotation adjusting screw(rod) (16), adjust the height of scrambler support (12), the initial position of fork (8) is adjusted to vertical state, and the minimum point of roller (1) is just contacted with conveyer belt, then screw E (14) is tightened, fix scrambler support (12), the angular displacement signal of the output of the incremental-rotating coder (10) under this state is simultaneously set to zero;
Step 2, in the time that slab moves forward with conveyer belt, pushing rolling wheels moves on (1), drive fork (8) to swing simultaneously, the armature spindle of incremental-rotating coder (10) rotates together, incremental-rotating coder (10) angle displacement pulse signal;
The angular displacement pulse signal of step 3, incremental-rotating coder (10) output is by data collecting card Gather and input computing machine, utilize the data processing software diagonal displacement pulse signal in computing machine to process, and utilize formula H=R (1-cos α) to calculate slab thickness, in formula, H is the thickness of tested slab, R is fork effective length, and α is the angle that fork swings while departing from plumbness, i.e. the rotational angle of incremental-rotating coder rotor;
Step 4, slab thickness value calculating being obtained by data processing software show in real time, and thickness signal value are exported to hot press slab feed arrangement and mat forming machine.
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| CN101806592A (en) * | 2010-05-06 | 2010-08-18 | 泰兴汤臣压克力有限公司 | On-line double-sided automatic thickness measuring device of organic glass |
| CN202562461U (en) * | 2011-10-25 | 2012-11-28 | 南京林业大学 | Apparatus for measuring slab thickness of medium-density fiberboard |
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| KR101081637B1 (en) * | 2010-02-17 | 2011-11-09 | 엘지엔시스(주) | Apparatus for sensing of media thickness |
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|---|---|---|---|---|
| CN101806592A (en) * | 2010-05-06 | 2010-08-18 | 泰兴汤臣压克力有限公司 | On-line double-sided automatic thickness measuring device of organic glass |
| CN202562461U (en) * | 2011-10-25 | 2012-11-28 | 南京林业大学 | Apparatus for measuring slab thickness of medium-density fiberboard |
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Effective date of registration: 20170619 Address after: 221438 Xinyi City, Jiangsu province wa Yao Zhen Ma Zhuang Cun (Guangdong furniture Park) Patentee after: XINYI DAZIRAN WOOD INDUSTRY CO., LTD. Address before: Nanjing City, Jiangsu province 210037 Longpan Road No. 159 Patentee before: Nanjing Forestry University |
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