{"id":25625,"date":"2020-03-12T10:00:34","date_gmt":"2020-03-12T09:00:34","guid":{"rendered":"https:\/\/www.lesjoforsab.com\/teknologi\/gasfjedre\/"},"modified":"2025-02-13T11:44:42","modified_gmt":"2025-02-13T10:44:42","slug":"gasfjedre","status":"publish","type":"page","link":"https:\/\/www.lesjoforsab.com\/da\/teknologi\/gasfjedre\/","title":{"rendered":"Gasfjedre"},"content":{"rendered":"\t\t
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Typiske anvendelsesomr\u00e5der omfatter kontrolleret \u00e5bning og lukning af luger og l\u00e5g. Men de kan v\u00e6re lige s\u00e5 dygtige til at kontrollere komplet udstyr s\u00e5som ventilation \u00e5bninger, stole, senge, vinduer, v\u00e6rkt\u00f8j og maskiner osv.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Forside<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Tekniske oplysninger om gasfjedre<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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De vigtigste komponenter i en gasfjeder er en cylinder, en stempelstang med stempelhoved, en forsegling og en guide.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Cylinderen er fyldt med komprimeret nitrogengas, som l\u00e6gger samme tryk p\u00e5 begge sider af stemplet. Overfladen af stempelstangen side af stemplet er mindre end p\u00e5 den modsatte side, der producerer en skubbekraft. I enkle vendinger bestemmes drivkraftens st\u00f8rrelse af tv\u00e6rsnitsomr\u00e5det af produktets stempelstang og det indre tryk inde i cylinderen.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tL\u00e6s mere om vores komplette sortiment af gasfjedre<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Egenskaber for gasfjeder<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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I mods\u00e6tning til de fleste andre typer af fjedre, gasfjedre har en indbygget pre-sp\u00e6nding kraft og en flad fjeder karakteristisk. Det betyder, at der kun er en lille forskel i kraft mellem fuld udvidelse og fuld kompression.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Efterh\u00e5nden som stempel- og stempelstangen presses ind i cylinderen, reduceres volumentrykket, og trykket \u00f8ges. Dette for\u00e5rsager skubbe kraft til at stige. I konventionelle gasfjedre er denne stigning normalt omkring 30% ved fuld kompression. Diagrammet illustrerer, i enkle vendinger, kr\u00e6fter F3, F4, F2 og F1 langs slagtilf\u00e6lde, n\u00e5r gasfjederen er fuldt komprimeret og derefter frigivet. F1 angiver kraften lige f\u00f8r fuld forl\u00e6ngelse.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Det er denne statiske F1 kraft, vi henviser til, n\u00e5r vi taler om kraften i en gasfjeder. Forskellen mellem kraftparf3\/F1 og F4\/F2 varierer alt efter friktionsm\u00e6ngden.<\/p>\n

Den skubbende fjederbev\u00e6gelse er langsom og kontrolleret. Det er afh\u00e6ngig af gasstr\u00f8mmen mellem stempelsiderne f\u00e5r lov til at passere gennem kanaler i stemplet under slagtilf\u00e6ldet.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Konventionelle gasfjedre bruger ‘hydraulisk d\u00e6mpning’, som indeb\u00e6rer en lille m\u00e6ngde olie, der s\u00e6nker hastigheden af slagtilf\u00e6ldet umiddelbart f\u00f8r fjederen n\u00e5r fuld forl\u00e6ngelse. Dette giver bev\u00e6gelsen en bremsekarakter i endepositionen, forudsat at stempelstangen er i nedadg\u00e5ende retning.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Kraftberegninger af gasfjedre<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Ved hj\u00e6lp af en softwarepakke udviklet internt, Lesj\u00f6fors er i stand til at simulere enhver form for anvendelse t\u00e6nkelige, s\u00e5 vi hurtigt hj\u00e6lpe med at beregne kraftkravet for netop dit design af dine gasfjedre.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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I enklere tilf\u00e6lde kan den kr\u00e6vede gasfjederkraft beregnes ved at indtaste relevante v\u00e6rdier i f\u00f8lgende formel:<\/p>\n

F1 = (G x L) \/ (W x n) + 10 – 15% fejlmargin<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Variabel<\/div><\/div><\/div><\/th>
Beskrivelse<\/div><\/div><\/div><\/th><\/tr><\/thead>\n\t\t\t\t\t\t\t\t
kr.<\/div><\/div><\/div><\/td>
Gasfjeder kraft i Newton<\/div><\/div><\/div><\/td><\/tr>
G<\/div><\/div><\/div><\/td>
Gravitationel tr\u00e6k i Newton af den bev\u00e6gelige del<\/div><\/div><\/div><\/td><\/tr>
C<\/div><\/div><\/div><\/td>
Forbindelsespunkt p\u00e5 den bev\u00e6gelige del<\/div><\/div><\/div><\/td><\/tr>
D<\/div><\/div><\/div><\/td>
Forbindelsespunkt p\u00e5 den faste del<\/div><\/div><\/div><\/td><\/tr>
E<\/div><\/div><\/div><\/td>
Drejeligt punkt<\/div><\/div><\/div><\/td><\/tr>
S<\/div><\/div><\/div><\/td>
Tyngdepunkt<\/div><\/div><\/div><\/td><\/tr>
L<\/div><\/div><\/div><\/td>
Vandret afstand fra E til S i \u00e5ben position<\/div><\/div><\/div><\/td><\/tr>
W<\/div><\/div><\/div><\/td>
Mindste afstand til E<\/div><\/div><\/div><\/td><\/tr>
N<\/div><\/div><\/div><\/td>
Antal gasfjedre<\/div><\/div><\/div><\/td><\/tr><\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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For hurtig og effektiv hj\u00e6lp, bedes du udfylde dette design ans\u00f8gninger formular og sende os<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Hent PDF<\/span><\/span>762 KB<\/small><\/span><\/a>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Krafttolerancer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tolerancer ved opladning med gas og andre faktorer betyder, at der kan v\u00e6re variationer i den kraft, der ud\u00f8ves af gasfjedre med samme nominelle F1-v\u00e6rdi. Tolerancerne i tabellen nedenfor er for h\u00f8je. de faktiske kr\u00e6fter er normalt meget t\u00e6t p\u00e5 den nominelle specifikation.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Krafttolerancer (N) <\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Kraft (N)<\/div><\/div><\/div><\/th>
Tolerance<\/div><\/div><\/div><\/th><\/tr><\/thead>\n\t\t\t\t\t\t\t\t
F1 \u2264 100<\/div><\/div><\/div><\/td>
+\/- 10<\/div><\/div><\/div><\/td><\/tr>
100 < F1 \u2264 200<\/div><\/div><\/div><\/td>
+\/- 20<\/div><\/div><\/div><\/td><\/tr>
200 < F1 \u2264 600<\/div><\/div><\/div><\/td>
+\/- 30<\/div><\/div><\/div><\/td><\/tr>
600 < F1 \u2264 1200<\/div><\/div><\/div><\/td>
+\/- 50<\/div><\/div><\/div><\/td><\/tr>
F1 > 1200 <\/div><\/div><\/div><\/td>
+\/- 100<\/div><\/div><\/div><\/td><\/tr><\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Krafttolerancer (N) 12-4<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Kraft (N)<\/div><\/div><\/div><\/th>
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F1 \u2264 50<\/div><\/div><\/div><\/td>
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50 < F1 \u2264 100<\/div><\/div><\/div><\/td>
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F1 > 100<\/div><\/div><\/div><\/td>
+\/- 15<\/div><\/div><\/div><\/td><\/tr><\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Bem\u00e6rk, at hvis den omgivende temperatur stiger eller falder, stiger eller falder gasfjederens kraft afh\u00e6ngigt af tryk\u00e6ndringer i cylinderen.<\/em><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Temperaturer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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De nominelle F1-v\u00e6rdier g\u00e6lder ved 20\u00b0C, som er den temperatur, hvor gasopladningen udf\u00f8res. Som tommelfingerregel stiger gasfjederkraften med ca. 3,5 % pr. 10 \u00b0C temperaturstigning og reduceres tilsvarende, n\u00e5r temperaturen falder.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Levetid for en gasfjeder <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Lesj\u00f6fors gasfjedre er generelt tilladt at have et maksimalt krafttab p\u00e5 10% efter 40000 cyklusser ved h\u00f8jst fem cyklusser i minuttet ved stuetemperatur og i ideelle monteringsforhold.<\/p>\n

Det skal dog erindres, at gasfjedre har en holdbarhed, efterh\u00e5nden som t\u00e6tningsmaterialet \u00e6ldes og slides. Der er flere faktorer, der p\u00e5virker gasfjederens levetid i en applikation.<\/p>\n

Eksterne faktorer s\u00e5som temperatur\u00e6ndringer og andre fysiske milj\u00f8m\u00e6ssige p\u00e5virkninger kan p\u00e5virke t\u00e6tning og slid og dermed fremskynde processen med krafttab.<\/p>\n

Desuden spiller tilpasning ogs\u00e5 en v\u00e6sentlig rolle. Hvis en gasfjeder i st\u00f8rstedelen af sin levetid har sin stempelstang, der peger nedad, vil t\u00e6tningerne og stempelstangen blive holdt smurt med olie, hvilket minimerer slid og l\u00e6kage.<\/p>\n

En gasfjeder vil ogs\u00e5 vare l\u00e6ngere, hvis den monteres fri for vibrationer og p\u00e5 en s\u00e5dan m\u00e5de, at der ikke kan produceres sidestyrker.<\/p>\n

En god regel for en designer er altid at v\u00e6lge en gasfjeder med den st\u00f8rst mulige cylindervolumen for den m\u00e6ngde kraft, der kr\u00e6ves.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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R\u00e5d til brug af gasfjedre<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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1.<\/strong> Gasfjedre er trykbeholdere. Fors\u00f8g aldrig at \u00e5bne en uden at f\u00f8lge instruktionerne i afsnittet “Genbrug”. Uds\u00e6t aldrig en gasfjeder for kraftig varme eller \u00e5ben ild.<\/p>\n

2.<\/strong> For at sikre den optimale funktion og levetid skal der monteres konventionelle gasfjedre, s\u00e5ledes at stempelstangen altid eller s\u00e5 ofte som muligt peger nedad under brug. Hvis stempelstangen er nede ved slagets ende, anvendes den hydrauliske d\u00e6mpning fuldt ud.<\/p>\n

3. <\/strong>Gasfjedre m\u00e5 under ingen omst\u00e6ndigheder uds\u00e6ttes for skadelige ydre p\u00e5virkninger eller voldelig h\u00e5ndtering. Lesj\u00f6fors p\u00e5tager sig intet garanti- eller returneringsansvar for f\u00f8lgende:<\/p>\n

3a.<\/strong> Synlige skader p\u00e5 stempelstangen, herunder mindre ridser, malingsst\u00f8v, b\u00f8jning eller lignende. Dette kan beskadige t\u00e6tningsfunktionen.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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3b.<\/strong> En beskadiget cylinder. Dette kan betyde, at funktionaliteten er bragt i fare og kan udg\u00f8re en direkte sikkerhedsrisiko. Fors\u00f8g aldrig at bruge en gasfjeder, der udviser sm\u00e5 buler eller b\u00f8jninger p\u00e5 sin cylinder. Tag det ud af brug og f\u00f8lg instruktionerne i afsnittet “Genbrug”.<\/p>\n

3c.<\/strong> Gasfjedre, hvor enten advarselsteksten, fremstillingsdatoen eller delnummeret er blevet fjernet ved foranstaltninger udadtil.<\/p>\n

4. Vores <\/strong>gasfjedre er designet til omgivelsestemperaturer p\u00e5 mellem -30 og +80\u00b0C. Undg\u00e5 om muligt intensiv brug i yderpunkterne af dette temperaturomr\u00e5de. Reduktion\/for\u00f8gelse af omgivelsestemperaturen betyder ogs\u00e5 en reduktion\/stigning i gasfjederkraften.<\/p>\n

5. <\/strong>Gasfjedre er designet til at h\u00e5ndtere aksiale belastninger. Undg\u00e5 radiale kr\u00e6fter (sidestyrker). V\u00e6lg s\u00e5 stort et tv\u00e6rsnit som muligt.<\/p>\n

6.<\/strong> Vi anbefaler altid brug af eksterne endestop i applikationen. Der m\u00e5 ikke ud\u00f8ves ydre kraft under slagtilf\u00e6ldet.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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7. <\/strong>Stempelstangen m\u00e5 ikke sm\u00f8res med fedt eller olie, og gasfjederen m\u00e5 ikke uds\u00e6ttes for olier eller opl\u00f8sningsmidler.<\/p>\n

8. <\/strong>Undg\u00e5 at bruge ikke-rustfri gaskilder i \u00e6tsende omgivelser.<\/p>\n

9. <\/strong>Uds\u00e6t ikke stempelstangen for snavs og st\u00f8v.<\/p>\n

10. <\/strong>Lange opbevaringsperioder kan f\u00e5 t\u00e6tningsmaterialet til at \u00e6ldes. Hvis opbevaring er n\u00f8dvendig, anbefaler vi, at du vedtager en “f\u00f8rst ind – f\u00f8rst ud”-politik. Hvis en gasfjeder har v\u00e6ret ubrugt i en l\u00e6ngere periode, kan det kr\u00e6ve lidt mere kraft at trykke stempelstangen ind, n\u00e5r den betjenes f\u00f8rste gang. Dette er normalt og har ikke en negativ indvirkning p\u00e5 fremtidig brug.<\/p>\n

Hvis alle disse punkter tages i betragtning, vil du v\u00e6re g\u00e5et et stykke vej i retning af sikker og velfungerende brug af gasfjedre. Lesj\u00f6fors kan dog ikke holdes ansvarlig for den endelige ans\u00f8gnings ydeevne eller sikkerhed.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Genbrug af en gasfjeder<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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De fleste gasfjedre er lavet af metal og kan derfor genbruges. Hvis du selv skal bortskaffe en gasfjeder, f.eks.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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1.<\/strong> Tryk gasfjederen ned ved at bore et 3 mm hul 20 mm fra cylinderenden med det fastgjort i lodret position og stempelstangen ned og i maksimalt forl\u00e6nget position. NB B\u00e6r beskyttelsesbriller, beskyttelsesbekl\u00e6dning og h\u00f8rev\u00e6rn, n\u00e5r du g\u00f8r dette, da fjederen vil larme, n\u00e5r den er gennemboret, og du kan blive udsat for sm\u00e5 m\u00e6ngder olie- og metalfragmenter.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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2. T\u00f8m<\/strong> olien gennem det borede hul ved at trykke p\u00e5 og tr\u00e6kke stempelstangen ud gentagne gange, hvis det er n\u00f8dvendigt. Genbrug olieaffaldet i overensstemmelse med lokale bestemmelser.<\/p>\n

3. <\/strong>Gasfjederen kan nu tages til et metalgenbrugscenter i overensstemmelse med lokale bestemmelser.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Typiske anvendelsesomr\u00e5der omfatter kontrolleret \u00e5bning og lukning af luger og l\u00e5g. Men de kan v\u00e6re lige s\u00e5 dygtige til at kontrollere komplet udstyr s\u00e5som ventilation \u00e5bninger, stole, senge, vinduer, v\u00e6rkt\u00f8j og maskiner osv. Tekniske oplysninger om gasfjedre De vigtigste komponenter i en gasfjeder er en cylinder, en stempelstang med stempelhoved, en forsegling og en guide. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":25597,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-25625","page","type-page","status-publish","hentry"],"yoast_head":"\nTekniske oplysninger om gasfjedre - Lesj\u00f6fors<\/title>\n<meta name=\"description\" content=\"F\u00e5 mere at vide om gasfjederteknologien og gasfjederegenskaberne. 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