DK176755B1

DK176755B1 - Method of manufacturing a glulam board and plant for practicing the method

Info

Publication number: DK176755B1
Application number: DK200701482A
Authority: DK
Inventors: Stefan Krebs Jensen; Markus Hofmann
Original assignee: Obel P Automation As
Priority date: 2007-10-15
Filing date: 2007-10-15
Publication date: 2009-06-22
Also published as: DK200701482A; EP2212069A1; WO2009049623A1

Description

DK 176755 B1DK 176755 B1

Titel; Fremgangsmåde ved fremstiiiina af en limtræsplade og anlæg til udøvelse af fremgangsmådenTitle; Method of preparing a glulam board and plant for carrying out the method

Opfindelsen angår en fremgangsmåde til opretning af lameller under fremstilling 5 af en limtræsplade, idet der foran en presse er et opretterbord, hvor lamellerne akkumuleres inden indføringen i pressen.The invention relates to a method for erecting slats during manufacture 5 of a glulam board, in front of a press there is a upright table where the slats accumulate prior to introduction into the press.

Ved produktion af limtræsplader i en kontinuert presse er der ikke et O-land for opretning i lamellernes længderetning. Derved kan man som følge af variationer 10 i lamelkvalitet, dimensioner og pressens fysiske udformning risikere, at lamellerne ikke er oprettet vinkelret på transportretningen. Dette resulterer i rombe-formede plader, som ikke lever op til de kvalitetskrav, der stilles til limtræsplader ti! f.eks, møbelproduktion.In the production of glulam sheets in a continuous press, there is no O-land for longitudinal alignment of the slats. Thereby, due to variations 10 in lamina quality, dimensions and the physical design of the press, it is possible that the lamellae are not created perpendicular to the direction of transport. This results in rhombus-shaped boards that do not meet the quality requirements of glulam boards ten! for example, furniture production.

15 Formålet med opfindelsen er at anvise en fremgangsmåde til at sikre, at pladerne er retvinklede, og at begyndende rombeform (vinkelfejl) detekteres og korrigeres ved hjælp af en differentialstyring af pressens fremtræk.The object of the invention is to provide a method for ensuring that the plates are at right angles and that incipient space shape (angular error) is detected and corrected by differential control of the press forward.

Dette formål er ifølge opfindelsen opnået ved, at der med jævne mellemrum 20 skabes afstand imellem to på hinanden følgende lameller, hvorefter bagkanten af den forreste af de to lameller detekteres ved hjælp af to fotoceller, som er placeret på en linje vinkelret på fremføringsretningen og med en vis afstand i lamellernes længderetning, idet en evt. tidsforskel imellem de af fotocellerne afgivne signaler for detektion af bagkanten udnyttes til at ændre fremføringsha-25 stigheden af lamellerne i den ene side i forhold ti! den anden side, indtil tidsforskellen er elimineret.This object is achieved according to the invention by periodically creating a distance between two consecutive lamellae, after which the trailing edge of the front of the two lamellae is detected by two photocells located on a line perpendicular to the feed direction and with a certain distance in the longitudinal direction of the slats; a time difference between the photocell detectors for detecting the trailing edge is utilized to change the feed rate of the slats on one side in relation to ten! the other side until the time difference is eliminated.

Opfindelsen angår også et anlæg til opretning af lameller under fremstilling af limtræsplader omfattende en presse, idet der foran pressen er et opretterbord, 30 hvor lamellerne kan akkumuleres inden indføringen i pressen. Anlægget er ejendommeligt ved, at det har en separationsmekanisme til med jævne mellemrum at skabe en afstand mellem to på hinanden følgende lameller, og mindst to fotoceller placeret på en linje vinkelret på fremføringsretningen og med en vis 2 DK 176755 B1 afstand i iameilens længderetning, og som er indrettet til at detektere bagkanten af lamellen, og et differentialdrev til i afhængighed af en evt tidsforskel mellem de af fotocellerne afgivne signaler at variere hastigheden i den ene side i forhold til den anden side, indtil tidsforskellen er elimineret.The invention also relates to a plant for erecting slats during the production of glulam boards comprising a press, the front of the press having a set-up table 30 where the slats can be accumulated prior to introduction into the press. The plant is characterized in that it has a separation mechanism for periodically creating a distance between two consecutive slats, and at least two photocells located on a line perpendicular to the feed direction and at a certain distance in the longitudinal direction of the frame. which is adapted to detect the trailing edge of the slat, and a differential drive to vary the speed on one side relative to the other side, depending on a possible time difference between the signals emitted by the photocells, until the time difference is eliminated.

55

De af fotocellerne afgivne signaler tilføres til en styreenhed, som beregner en evt. vinkelfejl, idet der ud fra vinkelfejlen beregnes en korrektionsfaktor. Ud fra denne korrektionsfaktor kan styreenheden beregne den nødvendige hastighedsforskel mellem differentialdrevne motorer.The signals emitted by the photocells are supplied to a control unit which calculates an ev. angular error, a correction factor is calculated from the angle error. From this correction factor, the controller can calculate the required speed difference between differential driven motors.

1010

Opfindelsen skal nærmere forklares i det følgende under henvisning til tegningen, hvor fig, 1 viser et anlæg ifølge opfindelsen til opretning af lameller under fremstilling 15 af en iimtræspiade, fig 2 hele anlægget set hhv. i perspektiv og fra siden, og fig 3 en fremføringsmekanisme set fra siden.BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail below with reference to the drawing, in which: Fig. 1 shows a plant according to the invention for erecting slats during manufacture 15 of a logwood pie; in perspective and from the side, and Fig. 3 is a side elevation feeding mechanism.

2020

Det i fig. 1 viste anlæg til opretning af lameller under fremstilling af en limtræsplade omfatter en presse 20. Foran pressen 20 er der et opretterbord - se fig. 2 -, hvor lamellerne kan akkumuleres inden indføringen i pressen 20. Lamellerne transporteres ind i pressen 20 ved hjælp af underliggende kæder 1, som kører 25 kontinuerligt. I fig. 2 er der vist i alt seks kæder 1. Ved hjælp af en separationsmekanisme skabes der med jævne mellemrum luftmeilemrum mellem to på hinanden følgende lameller under fremføringen. Denne separationsmekanisme omfatter to under de fremførte lameller liggende pneumatiske cylindre 3, idet der for enden af stempelstængerne er monteret gribesko 2. Disse gribesko 2 fø-30 res op og løfter den pågældende lamel ca. 2 mm fri af kædebanen. Cylindrene 3 er ophængt i en konsol 12. Samtidigt tilføres et overtryk til en over lamellerne liggende pneumatisk cylinder 6, som er ophængt i en fast monteret plade 7.The FIG. 1, for the erection of slats during the manufacture of a glulam board including a press 20. In front of the press 20 there is a set-up table - see fig. 2 - where the slats can be accumulated prior to introduction into the press 20. The slats are transported into the press 20 by means of underlying chains 1 which run 25 continuously. In FIG. 2, a total of six chains are shown 1. By means of a separation mechanism, air miles between two successive slats are created periodically during feeding. This separating mechanism comprises two pneumatic cylinders 3 located beneath the slats, with gripper shoes 2 mounted at the end of the piston rods. These gripping shoes 2 are raised and lift the respective slat approx. 2 mm clear of the chain path. The cylinders 3 are suspended in a bracket 12. At the same time an overpressure is applied to a pneumatic cylinder 6 overlying the slats, which is suspended in a fixed mounting plate 7.

Den pneumatiske cylinder 6 er for enden udstyret med en plade med påmonte- 3 DK 176755 B1 rede gummifriktionsklodser 4. Når såvel de underliggende som de overliggende cylindre aktiveres, fastholdes de derimellem liggende lameller og stopper derved alle bagved liggende lameller, hvorimod de foranliggende lameller fortsætter og føres ind i pressen 20. Derved opstår der en afstand mellem lamellerne 5 Dette registreres ved hjælp af nogle fotoceller 11, som er monteret i nogle fastsiddende beslag 13, således at de ligger på en linje på tværs af fremføringsretningen. Disse fotoceller 11 er for det første indrettet til at detektere bagkanten af de fortsættende lameller, når der er opstået en afstand. I tilfælde af at der er en tidsforskel imellem de af fotocellerne 11 afgivne signaler, registreres dette af en 10 styreenhed 21, som beregner en evt. vinkelfejl af de fremførte lameller. Styre-enheden 21 kan derefter ud fra vinkelfejlen beregne en korrektionsfaktor og ud fra denne korrektionsfaktor beregne en ønsket hastighedsforskel imellem diffe-rentialdrevne motorer, som styrer de underliggende fremføringskæder 1. Den ene motor 22 (MASTER) kører med pressens 20 linjehastighed, medens den 15 anden motor 23 (SLAVE) kører med linjehastigheden + den af styreenheden 21 ud fra vinkelfejlen beregnede hastighedsforskel. Styringen af motorerne 22, 23 sker f eks via en PID reguleringssløjfe med negativ tilbagekobling. Reguleringssløjfen vil derved af sig selv søge mod ligevægt, således at lamellerne kommer til at stå vinkelret på fremføringsretningen.The pneumatic cylinder 6 is equipped with a plate with mounted rubber friction pads 4 at the end. When both the underlying and the overlying cylinders are actuated, the adjacent lamellae are retained thereby stopping all the underlying lamellae, whereas the preceding lamellae continue. and is introduced into the press 20. This creates a distance between the slats 5. This is recorded by some photocells 11 which are mounted in some fixed brackets 13 so that they lie on a line transverse to the feed direction. These photocells 11 are firstly arranged to detect the trailing edge of the continuing slats when a distance has occurred. In the event that there is a time difference between the signals emitted by the photocells 11, this is detected by a control unit 21 which calculates a possible angular defects of the slats carried forward. The controller 21 can then calculate a correction factor from the angular error and from this correction factor calculate a desired speed difference between differential driven motors which control the underlying feed chains 1. One motor 22 (MASTER) runs at the line speed of the press 20 while it 15 second motor 23 (SLAVE) runs at line speed + the speed difference calculated by the control unit 21 from the angular error. The motors 22, 23 are controlled, for example, via a PID control loop with negative feedback. The control loop will thereby in itself seek for equilibrium, so that the slats are perpendicular to the direction of advance.

2020

En vis tid efter at fotocellerne 11 har registreret et luftmellemrum, gives et signal til at cylindrene 3, 6 slipper, og de bagved liggende lameller køres op imod de foran liggende lameller.A certain time after the photocells 11 have detected an air gap, a signal is given that the cylinders 3, 6 are released and the underlying slats are driven up against the slats in front.

25 For at sikre at lamellerne efter gribemekanismen ligger tæt sammen og kører stabilt, er der desuden via en i fig. 3 vist mekanisme tilført et tryk på 1-6 bar, der bevirker, at lamellerne presses ned mod kæderne 1 for derigennem at øge friktionen Denne mekanisme omfatter en pneumatisk cylinder 9, som er ophængt i en konsol 10. Cylinderen 9 presser nogle hjul 8 ned mod lamellerne Hjulene 8 30 er ophængt i et bogiesystem, hvorved hjulene 8 bliver bevægelige i vertikal retning, således at der altid er et hjul i kontakt med lamellerne, uanset om der skulle være en lille variation i lameltykkelserne.25 In order to ensure that the slats according to the gripping mechanism are close together and are stable, there is also via a device in FIG. 3 shows a pressure of 1-6 bar which causes the slats to be pressed down against the chains 1 to thereby increase the friction. This mechanism comprises a pneumatic cylinder 9 which is suspended in a bracket 10. The cylinder 9 depresses some wheels 8 against the slats The wheels 8 30 are suspended in a bogie system, whereby the wheels 8 move in a vertical direction, so that there is always a wheel in contact with the slats, whether or not there is a slight variation in the thickness of the slats.

Claims

A method of erecting slats during the manufacture of a glulam board, in front of a press (20) there is a upright table, the slats being accumulated prior to insertion into the press, characterized in that spacers are periodically spaced between two. successive lamellae, whereupon the trailing edge of the front of the two lamellae is detected by two photocells (11) located on a line perpendicular to the feed direction and at a certain distance in the longitudinal direction of the lamellae. a time difference between the signals provided by the photo cells (11) for detecting the trailing edge is utilized to change the rate of advance of the slats on one side relative to the other side until the time difference is eliminated.

A system for aligning slats during the manufacture of glulam boards including a press (20), the front of the press having an upright table where the slats can be accumulated prior to insertion into the press (20), characterized in that it has a separating mechanism ( 3, 6) to periodically create a distance between two consecutive slats, and at least two photocells (11) located on a line perpendicular to the feed direction and at a certain distance in the longitudinal direction of the slat 20, which is arranged to detect the rear edge of the slat, and a differential drive to vary the speed on one side relative to the other side, depending on a possible time difference between the signals delivered by the photocells (11), until the time difference is eliminated.

System according to claim 2, characterized in that the signals emitted by the photocells (11) are applied to a control unit (21) which calculates any angular error.

System according to claim 3, characterized in that a correction factor is calculated from the angle error. 30

4 DK 176755 B1

System according to claim 4, characterized in that the control unit (21) uses the correction factor to calculate a speed difference between differential driven motors (22, 23). 5 DK 176755 B1

System according to claim 5, characterized in that the motors (22, 23) are controlled via a PID control loop.

System according to claim 6, characterized in that one motor (22) (MASTER) runs at the line speed of the press (20), while the other motor (23) (SLAVE) runs at the line speed ± that of the control unit (21). the angular error calculated velocity difference.