{"id":4638,"date":"2024-10-31T23:35:21","date_gmt":"2024-10-31T15:35:21","guid":{"rendered":"https:\/\/www.hnhlcrane.com\/?post_type=product&#038;p=4638"},"modified":"2026-03-04T13:59:37","modified_gmt":"2026-03-04T05:59:37","slug":"polia-de-ponte-rolante","status":"publish","type":"product","link":"https:\/\/www.hnhlcrane.com\/pt\/product\/polia-de-ponte-rolante\/","title":{"rendered":"Polia de ponte rolante"},"content":{"rendered":"<h6><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 18pt;\">A composi\u00e7\u00e3o da polia da ponte rolante<\/span><\/strong><\/h6>\n<p>O <strong>polia de ponte rolante<\/strong> \u00e9 um componente essencial da maquinaria de eleva\u00e7\u00e3o, que desempenha v\u00e1rias fun\u00e7\u00f5es atrav\u00e9s da utiliza\u00e7\u00e3o combinada de roldanas fixas e m\u00f3veis, incluindo a eleva\u00e7\u00e3o de objectos pesados, a altera\u00e7\u00e3o da dire\u00e7\u00e3o da for\u00e7a e a redu\u00e7\u00e3o do esfor\u00e7o necess\u00e1rio. Estas roldanas s\u00e3o normalmente fabricadas utilizando diferentes materiais e processos, tais como ferro fundido, a\u00e7o fundido ou chapa de a\u00e7o laminada, para satisfazer requisitos espec\u00edficos de for\u00e7a, resist\u00eancia ao desgaste e propriedades de leveza, dependendo das condi\u00e7\u00f5es de trabalho.<\/p>\n<ul>\n<li><strong>Polia fixa<\/strong>: Serve principalmente para mudar a dire\u00e7\u00e3o da for\u00e7a sem reduzir o esfor\u00e7o. O princ\u00edpio da polia fixa baseia-se numa alavanca de bra\u00e7o igual, em que o bra\u00e7o de pot\u00eancia e o bra\u00e7o de resist\u00eancia s\u00e3o iguais, o que significa que n\u00e3o poupa nem necessita de for\u00e7a suplementar para funcionar. Em situa\u00e7\u00f5es em que o peso do cabo e o atrito entre o cabo e a polia s\u00e3o insignificantes, a polia fixa pode manter a dire\u00e7\u00e3o da for\u00e7a do cabo constante, o que \u00e9 fundamental para a eleva\u00e7\u00e3o est\u00e1vel de objectos.<\/li>\n<li><strong>Polia m\u00f3vel<\/strong>: Instalado no <a href=\"https:\/\/www.hnhlcrane.com\/pt\/product\/gancho_de_guindaste\/\" target=\"_blank\" rel=\"noopener\"><strong>gancho de guindaste<\/strong><\/a>. Ao elevar uma carga com uma polia m\u00f3vel, pode poupar metade do esfor\u00e7o, mas requer puxar o dobro da dist\u00e2ncia do cabo de a\u00e7o. O princ\u00edpio subjacente \u00e0 polia m\u00f3vel \u00e9 que a carga \u00e9 suportada por dois segmentos de cabo, sendo que cada segmento suporta apenas metade do peso, proporcionando assim um efeito de poupan\u00e7a de esfor\u00e7o.<\/li>\n<li><strong>Bloco de polias<\/strong>: Composto por v\u00e1rias roldanas fixas e m\u00f3veis, permite uma combina\u00e7\u00e3o da vantagem de poupan\u00e7a de for\u00e7a da roldana m\u00f3vel e da mudan\u00e7a de dire\u00e7\u00e3o proporcionada pela roldana fixa. Isto permite a redu\u00e7\u00e3o da for\u00e7a e a altera\u00e7\u00e3o da dire\u00e7\u00e3o, possibilitando uma eleva\u00e7\u00e3o mais eficiente de cargas pesadas. O princ\u00edpio de funcionamento do bloco de roldanas baseia-se na combina\u00e7\u00e3o da carater\u00edstica de poupan\u00e7a de esfor\u00e7o da roldana m\u00f3vel e da capacidade de mudan\u00e7a de dire\u00e7\u00e3o da roldana fixa.<\/li>\n<\/ul>\n<h6><strong><span style=\"font-size: 18pt; font-family: arial, helvetica, sans-serif;\">Normas de descarte de polias de pontes rolantes:<\/span><\/strong><\/h6>\n<ul>\n<li><strong>Desgaste<\/strong>: Se o desgaste da polia exceder 10% as suas dimens\u00f5es originais ou afetar o bom funcionamento do cabo de a\u00e7o.<\/li>\n<li><strong>Fissuras<\/strong>: A presen\u00e7a de fissuras, especialmente em zonas cr\u00edticas como a ranhura ou o flange.<\/li>\n<li><strong>Deforma\u00e7\u00e3o<\/strong>: Deforma\u00e7\u00e3o percet\u00edvel, por exemplo na ranhura ou na flange, que afecta o funcionamento normal.<\/li>\n<li><strong>Fratura por fadiga<\/strong>: Ocorr\u00eancia de fracturas por fadiga em qualquer parte da polia.<\/li>\n<li><strong>Corros\u00e3o<\/strong>: Ferrugem que excede 5% das dimens\u00f5es originais.<\/li>\n<li><strong>Folga<\/strong>: Rolamentos soltos ou danificados.<\/li>\n<\/ul>\n<p>A forma e a dimens\u00e3o da sec\u00e7\u00e3o transversal do <strong>ranhuras na polia da ponte rolante<\/strong> afectam significativamente a sua fiabilidade e a vida \u00fatil do cabo de a\u00e7o. As paredes das ranhuras devem ser lisas para evitar o emaranhamento do cabo, garantindo um funcionamento seguro.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-4661\" src=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/2c3298f754c74475b02a6f73bb33df8-300x140.png\" alt=\"Polia de ponte rolante\" width=\"1104\" height=\"515\" srcset=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/2c3298f754c74475b02a6f73bb33df8-300x140.png 300w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/2c3298f754c74475b02a6f73bb33df8-1024x479.png 1024w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/2c3298f754c74475b02a6f73bb33df8-768x359.png 768w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/2c3298f754c74475b02a6f73bb33df8-600x281.png 600w\" sizes=\"(max-width: 1104px) 100vw, 1104px\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4688\" src=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1-300x96.jpg\" alt=\"\" width=\"1100\" height=\"352\" srcset=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1-300x96.jpg 300w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1-1024x327.jpg 1024w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1-768x245.jpg 768w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1-600x192.jpg 600w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-1-1.jpg 1500w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/> <img decoding=\"async\" class=\"alignnone wp-image-4689\" src=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-2-1-300x82.jpg\" alt=\"\" width=\"1101\" height=\"301\" srcset=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-2-1-300x82.jpg 300w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-2-1-1024x279.jpg 1024w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-2-1-768x209.jpg 768w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-2-1-600x163.jpg 600w\" sizes=\"(max-width: 1101px) 100vw, 1101px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4690\" style=\"font-family: var(--global-body-font-family);\" src=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1-300x86.jpg\" alt=\"\" width=\"1102\" height=\"316\" srcset=\"https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1-300x86.jpg 300w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1-1024x294.jpg 1024w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1-768x220.jpg 768w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1-600x172.jpg 600w, https:\/\/www.hnhlcrane.com\/wp-content\/uploads\/2024\/10\/Overhead-crane-pulley-3-1.jpg 1500w\" sizes=\"(max-width: 1102px) 100vw, 1102px\" \/><span style=\"font-family: var(--global-body-font-family);\">\u00a0<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p><strong>Par\u00e2metros da polia da ponte rolante:<\/strong><\/p>\n<ul>\n<li><span style=\"font-size: 12pt;\"><strong>Especifica\u00e7\u00f5es<\/strong>: \u03a6250, \u03a6400, \u03a6500, \u03a6610, \u03a6710, \u03a6800, \u03a6900, \u03a61000, \u03a61200<\/span><\/li>\n<li><span style=\"font-size: 12pt;\"><strong>Material da polia<\/strong>: HT20-40, ZG35, Q235B, Q355B<\/span><\/li>\n<li><span style=\"font-size: 12pt;\"><strong>Processo de fabrico<\/strong>: Ferro fundido, a\u00e7o fundido, chapa de a\u00e7o laminada<\/span><\/li>\n<li><span style=\"font-size: 12pt;\"><strong>Tamanho da ranhura da polia<\/strong>: Determinado em fun\u00e7\u00e3o do di\u00e2metro do cabo de a\u00e7o<\/span><\/li>\n<li><span style=\"font-size: 12pt;\"><strong>Personaliza\u00e7\u00e3o fora do padr\u00e3o<\/strong>: Podemos fabricar de acordo com os desenhos fornecidos por si<\/span><\/li>\n<\/ul>","protected":false},"featured_media":4640,"template":"","meta":{"_kad_post_transparent":"default","_kad_post_title":"","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"show","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"product_brand":[1480],"product_cat":[46],"product_tag":[671,672,668,676,92,654,786,89,643,90,639,787,793,664,645,93,658,663,673,677,790,665,674,666,788,642,71,792,641,667,655,675,659,646,670,789,91,684,650,651,648,683,653,680,678,681,685,682,687,686,679,74,657,656,652,649,644,647,669,660,791,662,661,640],"class_list":{"0":"post-4638","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-hl-crane","7":"product_cat-crane_hook","8":"product_tag-aluminum-pulley","9":"product_tag-brass-pulley","10":"product_tag-cast-iron-pulley","11":"product_tag-coated-pulley","12":"product_tag-crane-hook","13":"product_tag-crane-hook-pulley","14":"product_tag-crane-parts-manufacturer","15":"product_tag-crane-pulley","16":"product_tag-crane-pulley-block","17":"product_tag-crane-pulley-supplier","18":"product_tag-crane-sheave","19":"product_tag-crane-spare-parts-supplier","20":"product_tag-custom-crane-parts-fabrication","21":"product_tag-deep-groove-pulley","22":"product_tag-double-sheave-pulley","23":"product_tag-european-hook-pulley","24":"product_tag-fixed-pulley","25":"product_tag-flat-groove-pulley","26":"product_tag-forged-pulley","27":"product_tag-galvanized-pulley","28":"product_tag-gantry-crane-spare-parts","29":"product_tag-grooveless-pulley","30":"product_tag-heat-treated-pulley","31":"product_tag-heavy-duty-pulley","32":"product_tag-hoist-components-provider","33":"product_tag-hoisting-pulley","34":"product_tag-hook-pulley","35":"product_tag-industrial-crane-parts-exporter","36":"product_tag-lifting-pulley","37":"product_tag-light-duty-pulley","38":"product_tag-load-bearing-pulley","39":"product_tag-machined-pulley","40":"product_tag-movable-pulley","41":"product_tag-multiple-sheave-pulley","42":"product_tag-nylon-pulley","43":"product_tag-overhead-crane-parts-distributor","44":"product_tag-overhead-crane-pulley","45":"product_tag-pulley-alignment","46":"product_tag-pulley-axle","47":"product_tag-pulley-bearing","48":"product_tag-pulley-block-assembly","49":"product_tag-pulley-deformation","50":"product_tag-pulley-frame","51":"product_tag-pulley-inspection","52":"product_tag-pulley-load-capacity","53":"product_tag-pulley-lubrication","54":"product_tag-pulley-noise-reduction","55":"product_tag-pulley-replacement","56":"product_tag-pulley-safety-factor","57":"product_tag-pulley-tension-adjustment","58":"product_tag-pulley-wear-resistance","59":"product_tag-rolled-pulley","60":"product_tag-rope-drum-pulley","61":"product_tag-rope-guide-pulley","62":"product_tag-sheave-groove","63":"product_tag-sheave-wheel","64":"product_tag-single-sheave-pulley","65":"product_tag-snatch-block","66":"product_tag-steel-pulley","67":"product_tag-swivel-pulley","68":"product_tag-tower-crane-components-supplier","69":"product_tag-u-groove-pulley","70":"product_tag-v-groove-pulley","71":"product_tag-wire-rope-pulley","73":"first","74":"instock","75":"featured","76":"shipping-taxable","77":"product-type-simple","78":"entry","79":"content-bg","80":"loop-entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Overhead Crane Pulley Manufacturer | 300mm-1250mm Custom Sheaves<\/title>\n<meta name=\"description\" content=\"Professional overhead crane pulley manufacturer in China. Custom diameter, groove type and load capacity up to 50 ton. ISO certified factory, OEM available. Fast quotation within 24 hours.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hnhlcrane.com\/pt\/product\/polia-de-ponte-rolante\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Overhead Crane Pulley Manufacturer | 300mm-1250mm Custom Sheaves\" \/>\n<meta property=\"og:description\" content=\"Professional overhead crane pulley manufacturer in China. Custom diameter, groove type and load capacity up to 50 ton. ISO certified factory, OEM available. 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