{"id":1403,"date":"2026-10-23T08:00:00","date_gmt":"2026-10-23T08:00:00","guid":{"rendered":"https:\/\/paowogroup.com\/?p=1403"},"modified":"2026-10-26T02:40:53","modified_gmt":"2026-10-26T02:40:53","slug":"uhmwpe-bushings-shaft-clearance-and-long-dwell","status":"publish","type":"post","link":"https:\/\/paowogroup.com\/vi\/uhmwpe-bushings-shaft-clearance-and-long-dwell\/","title":{"rendered":"UHMWPE Bushings: Gi\u1ea3i ph\u00f3ng m\u1eb7t b\u1eb1ng tr\u1ee5c v\u00e0 Long Dwell"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>M\u1ee5c l\u1ee5c<\/h2><nav><ul><li class=\"\"><a href=\"#shaft-clearance-and-long-dwell\">Shaft Clearance and Long Dwell<\/a><ul><li class=\"\"><a href=\"#function-before-shape\">Function before shape<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#the-inputs-that-define-uhmwpe-bushings\">The inputs that define UHMWPE bushings<\/a><ul><li class=\"\"><a href=\"#time-and-loading\">Time and loading<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#design-the-complete-interface-uhmwpe-bushings\">Design the complete interface: UHMWPE bushings<\/a><ul><li class=\"\"><a href=\"#fastening\">Fastening<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#compare-the-available-procurement-routes\">So s\u00e1nh c\u00e1c tuy\u1ebfn mua s\u1eafm c\u00f3 s\u1eb5n<\/a><ul><li class=\"\"><a href=\"#rotating-parts\">Rotating parts<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#qualify-a-representative-sample-or-trial\">Qualify a representative sample or trial<\/a><ul><li class=\"\"><a href=\"#sliding-contacts\">Sliding contacts<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#recognize-the-limits-and-stop-conditions\">Nh\u1eadn bi\u1ebft c\u00e1c gi\u1edbi h\u1ea1n v\u00e0 \u0111i\u1ec1u ki\u1ec7n d\u1eebng<\/a><ul><li class=\"\"><a href=\"#worn-references\">Worn references<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#build-a-complete-quotation-package\">X\u00e2y d\u1ef1ng g\u00f3i b\u00e1o gi\u00e1 ho\u00e0n ch\u1ec9nh<\/a><ul><li class=\"\"><a href=\"#application-chemistry\">Application chemistry<\/a><\/li><li class=\"\"><a href=\"#transfer-qualification\">Transfer qualification<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#discuss-the-reviewed-requirement-with-paowo\">Th\u1ea3o lu\u1eadn v\u1ec1 y\u00eau c\u1ea7u \u0111\u00e3 xem x\u00e9t v\u1edbi Paowo<\/a><\/li><li class=\"\"><a href=\"#frequently-asked-questions\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/a><ul><li class=\"\"><a href=\"#faq-005-1\">What is the first issue to review for UHMWPE bushings?<\/a><\/li><li class=\"\"><a href=\"#faq-005-2\">What information is needed to specify UHMWPE bushings?<\/a><\/li><li class=\"\"><a href=\"#faq-005-3\">How should a trial of UHMWPE bushings be assessed?<\/a><\/li><li class=\"\"><a href=\"#faq-005-4\">When should approval of UHMWPE bushings be held?<\/a><\/li><li class=\"\"><a href=\"#faq-005-5\">What should I send Paowo when requesting UHMWPE bushings?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">A slow-moving shaft needs a polymer bushing in a damp work area. For buyers reviewing UHMWPE bushings, the practical question is whether the offered product and its supporting evidence address this specific requirement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide examines shaft clearance and long dwell as a defined engineering and purchasing decision. It connects the duty, interface, qualification and quotation so procurement can resolve the important questions before releasing an order.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-4.jpg\" alt=\"White plastic gears and rollers on a conveyor assembly\" class=\"wp-image-306\" srcset=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-4.jpg 600w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-4-300x200.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 id=\"shaft-clearance-and-long-dwell\" class=\"wp-block-heading\">Shaft Clearance and Long Dwell<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Initial clearance can change with temperature, loading duration and the surrounding housing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Put shaft, housing and sleeve on one section drawing and identify the required operating clearance. Record speed, loading duration and temperature for the responsible designer. Inspect the released bushing and qualify the approved assembly. A bore that fits a room-temperature gauge can still leave unanswered questions about a constrained housing and long loaded dwell in service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Start by separating the observed symptom from the proposed product change. Record what happens, where it happens and the operating condition in which it matters. That makes the review of UHMWPE bushings specific enough to support a decision, rather than a comparison of broad product descriptions.<\/p>\n\n\n\n<h3 id=\"function-before-shape\" class=\"wp-block-heading\">Function before shape<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For UHMWPE bushings, describe what the component does in the assembly before optimizing its geometry. Sliding, guiding, scraping and structural support have different requirements. A successful polymer wear part does not establish suitability for every metal replacement. Identify load, temperature, stiffness and functional consequences, then retain the responsible technical owner&#8217;s approval for the proposed material and design.<\/p>\n\n\n\n<h2 id=\"the-inputs-that-define-uhmwpe-bushings\" class=\"wp-block-heading\">The inputs that define UHMWPE bushings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Record shaft diameter, housing fit, load, speed, temperature, dwell. Keep the units, revision and source of each input with the inquiry. Distinguish a measured value from an estimate, and identify the person responsible for resolving any critical unknown. A supplier can review an explicit assumption; an undocumented assumption is much harder to detect.<\/p>\n\n\n\n<h3 id=\"time-and-loading\" class=\"wp-block-heading\">Time and loading<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sustained load and operating temperature can affect UHMWPE bushings, particularly at thin sections or concentrated contacts. Specify duty duration and allow the responsible designer to review deformation and functional clearance. A short fit check cannot qualify long-term loaded behavior. Keep the grade-specific limits and the assembly&#8217;s replacement or adjustment criteria connected to the design.<\/p>\n\n\n\n<h2 id=\"design-the-complete-interface-uhmwpe-bushings\" class=\"wp-block-heading\">Design the complete interface: UHMWPE bushings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Review the complete bearing arrangement and grade-specific limits before defining fit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Review UHMWPE bushings in the installed arrangement. Show adjoining components, the direction of movement or load, and the space needed for installation and later removal. If the interface changes, update the released drawing and acceptance basis together so the quote and the technical approval still refer to the same requirement.<\/p>\n\n\n\n<h3 id=\"fastening\" class=\"wp-block-heading\">Fastening<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Repeated assembly and clamp load can matter in UHMWPE bushings. Review threads, inserts, through-fixings and the remaining section with the responsible designer. Include the mating hardware and assembly expectations in the specification. Do not assign a universal tightening value without a validated fastening design; inspection should verify the approved geometry and seating condition.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining.png\" alt=\"Machining a white plastic component with a CNC spindle and fixtures\" class=\"wp-image-1263\" srcset=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining.png 1536w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining-300x200.png 300w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining-1024x683.png 1024w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining-768x512.png 768w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining-18x12.png 18w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/08\/family-uhmwpe-machining-600x400.png 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n\n\n\n<h2 id=\"compare-the-available-procurement-routes\" class=\"wp-block-heading\">So s\u00e1nh c\u00e1c tuy\u1ebfn mua s\u1eafm c\u00f3 s\u1eb5n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use the comparison below to decide what must happen before purchasing UHMWPE bushings. The routes describe different scopes of work; they are not interchangeable offers. In this application, the controlling issue is shaft clearance and long dwell. An apparently cheaper route may leave that issue unresolved.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Tuy\u1ebfn \u0111\u01b0\u1eddng<\/th><th>Khi n\u00f3 \u0111\u00e1ng \u0111\u01b0\u1ee3c xem x\u00e9t<\/th><th>B\u1eb1ng ch\u1ee9ng c\u1ea7n thi\u1ebft tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh<\/th><\/tr><\/thead><tbody><tr><td>Approved drawing reproduction<\/td><td>Suitable when nominal geometry, grade and duty are established.<\/td><td>Control files, revisions, inspection and first-article acceptance.<\/td><\/tr><tr><td>Reviewed redesign<\/td><td>Appropriate when a worn sample or changed interface leaves gaps.<\/td><td>Define function and approve the reconstructed or modified design.<\/td><\/tr><tr><td>Alternative material or assembly<\/td><td>Worth review when UHMWPE cannot meet the actual duty.<\/td><td>Assess stiffness, heat, load and functional consequences with the designer.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"rotating-parts\" class=\"wp-block-heading\">Rotating parts<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For rotating applications of UHMWPE bushings, define concentricity or runout relative to the functional bore and support system. An accurate outside diameter does not establish smooth rotation. The shaft, bearings, load, speed and temperature also need review. A dimensional report and an approved representative operating trial answer different parts of the qualification question.<\/p>\n\n\n\n<h2 id=\"qualify-a-representative-sample-or-trial\" class=\"wp-block-heading\">Qualify a representative sample or trial<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Measure the released part and run an approved representative assembly trial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For UHMWPE bushings, write the trial objective before collecting results. Record the item or sample identity, drawing revision, conditions, observations and acceptance decision. Keep a photograph or measurement record where it helps explain the outcome. If the trial covers only one part of the duty, retain the remaining questions instead of treating a limited result as full approval.<\/p>\n\n\n\n<h3 id=\"sliding-contacts\" class=\"wp-block-heading\">Sliding contacts<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The performance of UHMWPE bushings in sliding duty depends on the paired surface, alignment and debris. Inspect the metal rail or shaft for damage before evaluating a new plastic component. Record contact marks and changes in motion under representative conditions. Replacing the polymer alone may leave a sharp counterface defect or misaligned support untouched.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-7.jpg\" alt=\"Caliper and bearing on a mechanical engineering drawing\" class=\"wp-image-736\" srcset=\"https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-7.jpg 600w, https:\/\/paowogroup.com\/wp-content\/uploads\/2026\/06\/yingyong-7-300x200.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 id=\"recognize-the-limits-and-stop-conditions\" class=\"wp-block-heading\">Nh\u1eadn bi\u1ebft c\u00e1c gi\u1edbi h\u1ea1n v\u00e0 \u0111i\u1ec1u ki\u1ec7n d\u1eebng<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Binding, excess heat or progressive deformation requires bearing-design reassessment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">X\u00e1c \u0111\u1ecbnh ai c\u00f3 th\u1ec3 \u0111\u00ecnh ch\u1ec9 ph\u00ea duy\u1ec7t v\u00e0 ai c\u00f3 th\u1ec3 \u1ee7y quy\u1ec1n s\u1eeda ch\u1eefa. b\u1ea3o qu\u1ea3n m\u1eb7t h\u00e0ng th\u1ea5t b\u1ea1i, c\u00e1c ph\u00e9p \u0111o c\u00f3 li\u00ean quan v\u00e0 chi ti\u1ebft v\u1eadn h\u00e0nh \u1edf n\u01a1i th\u1ef1c t\u1ebf. Thay \u0111\u1ed5i s\u1ea3n ph\u1ea9m v\u00e0 quy tr\u00ecnh xung quanh \u0111\u1ed3ng th\u1eddi c\u00f3 th\u1ec3 g\u00e2y kh\u00f3 kh\u0103n cho vi\u1ec7c thi\u1ebft l\u1eadp. H\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo n\u00ean gi\u1ea3i quy\u1ebft s\u1ef1 kh\u00f4ng ch\u1eafc ch\u1eafn ki\u1ec3m so\u00e1t thay v\u00ec ch\u1ec9 l\u1eb7p l\u1ea1i vi\u1ec7c mua h\u00e0ng v\u1edbi k\u00edch th\u01b0\u1edbc danh ngh\u0129a l\u1edbn h\u01a1n.<\/p>\n\n\n\n<h3 id=\"worn-references\" class=\"wp-block-heading\">Worn references<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A worn sample used to specify UHMWPE bushings can contain lost dimensions, distortion and previous repairs. Identify unworn datums and collect mating-part information before reconstructing the nominal design. Approve the resulting drawing with the equipment owner. Exact replication should refer to that approved specification, not a promise to reproduce every defect in the physical sample.<\/p>\n\n\n\n<h2 id=\"build-a-complete-quotation-package\" class=\"wp-block-heading\">X\u00e2y d\u1ef1ng g\u00f3i b\u00e1o gi\u00e1 ho\u00e0n ch\u1ec9nh<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Supply shaft and housing drawings with duty conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The quotation package for UHMWPE bushings should identify the requested quantity, delivery destination and purchased condition, together with the relevant drawing or layout. Ask suppliers to list exclusions and deviations clearly. Compare like scope: material identity, functional dimensions, inspection, packing and any first-article work should be visible beside the unit price.<\/p>\n\n\n\n<h3 id=\"application-chemistry\" class=\"wp-block-heading\">Application chemistry<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For UHMWPE bushings, identify the actual cleaner or process liquid, concentration, temperature and exposure duration. Grade-specific compatibility needs review. A general corrosion-resistant description does not approve every chemical contact. Where contact-sensitive documentation is required, ask for the applicable declaration for the supplied formulation and intended use, and retain traceability to the delivered lot.<\/p>\n\n\n\n<h3 id=\"transfer-qualification\" class=\"wp-block-heading\">Transfer qualification<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Changing the supplier of UHMWPE bushings deserves a defined transfer review. The same drawing can be produced with different material assumptions, workholding or inspection methods. Compare the new first article with the original acceptance criteria and approved duty. Keep any deviations controlled until the technical owner accepts them; a purchasing change alone does not validate interchangeability.<\/p>\n\n\n\n<h2 id=\"discuss-the-reviewed-requirement-with-paowo\" class=\"wp-block-heading\">Th\u1ea3o lu\u1eadn v\u1ec1 y\u00eau c\u1ea7u \u0111\u00e3 xem x\u00e9t v\u1edbi Paowo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Danh s\u00e1ch Paowo <a href=\"https:\/\/paowogroup.com\/vi\/product\/custom-uhmwpe-machined-parts\/\">B\u1ed9 ph\u1eadn gia c\u00f4ng UHMWPE t\u00f9y ch\u1ec9nh<\/a> trong s\u1ed1 c\u00e1c s\u1ea3n ph\u1ea9m hi\u1ec7n t\u1ea1i c\u1ee7a n\u00f3 v\u00e0 m\u00f4 t\u1ea3 c\u00f4ng vi\u1ec7c v\u1ebd v\u00e0 d\u1ef1a tr\u00ean m\u1eabu th\u00f4ng qua n\u00f3 <a href=\"https:\/\/paowogroup.com\/vi\/oem-odm-custom\/\">OEM v\u00e0 ODM d\u1ecbch v\u1ee5 t\u00f9y ch\u1ec9nh<\/a>. \u0110\u1ed1i v\u1edbi \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn \u1edf \u0111\u00e2y, h\u00e3y g\u1eedi th\u00f4ng tin v\u1ec1 giao di\u1ec7n v\u00e0 nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3 tr\u01b0\u1edbc khi y\u00eau c\u1ea7u \u0111\u1ec1 xu\u1ea5t cu\u1ed1i c\u00f9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 xem l\u1ea1i trang web c\u1ee7a <a href=\"https:\/\/paowogroup.com\/vi\/industrial-machinery-plastic-parts\/\">khu v\u1ef1c \u1ee9ng d\u1ee5ng li\u00ean quan<\/a> v\u00e0 b\u00e0i vi\u1ebft hi\u1ec7n c\u00f3 <a href=\"https:\/\/paowogroup.com\/vi\/uhmwpe-thermal-expansion\/\">UHMWPE nhi\u1ec7t m\u1edf r\u1ed9ng: H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00f3ng m\u1eb7t b\u1eb1ng v\u00e0 Fit<\/a> for adjoining considerations. Keep the scope of this inquiry centered on shaft clearance and long dwell.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi b\u1ed1i c\u1ea3nh c\u00f3 th\u1ea9m quy\u1ec1n, xem <a href=\"https:\/\/www.nist.gov\/publications\/20-degrees-celsius-short-history-standard-reference-temperature-industrial-dimensional\" target=\"_blank\" rel=\"noopener\">NIST reference-temperature guidance<\/a>. NIST describes 20\u00b0C as the reference temperature for industrial dimensional measurement. State the agreed inspection condition and distinguish it from operating clearance; the reference does not approve any particular component tolerance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Request a review of UHMWPE bushings with your drawings, operating conditions, required outcome and delivery needs. Ask Paowo to identify the offered grade and specification, state unresolved assumptions and separate sample work from production scope. Use the inquiry form after the FAQ to share the requirement and request a quotation.<\/p>\n\n\n\n<h2 id=\"frequently-asked-questions\" class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<div id=\"faq-005-1\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">What is the first issue to review for UHMWPE bushings?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Initial clearance can change with temperature, loading duration and the surrounding housing. Start with the actual duty and the relevant interfaces rather than the product name alone.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-005-2\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">What information is needed to specify UHMWPE bushings?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Provide shaft diameter, housing fit, load, speed, temperature, dwell. Include a drawing or layout showing the complete interface and identify critical unknowns before release.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-005-3\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">How should a trial of UHMWPE bushings be assessed?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Measure the released part and run an approved representative assembly trial. Keep sample identity, representative conditions and the agreed acceptance decision in the trial record.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-005-4\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">When should approval of UHMWPE bushings be held?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Binding, excess heat or progressive deformation requires bearing-design reassessment. Resolve the cause and obtain the responsible technical approval before release or continued use.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-005-5\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">What should I send Paowo when requesting UHMWPE bushings?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Supply shaft and housing drawings with duty conditions. Add the quantity, destination, current drawing revision and required documentation so offers can be compared on equivalent scope.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class='fluentform ff-default fluentform_wrapper_3 ffs_default_wrap'><form data-form_id=\"3\" id=\"fluentform_3\" class=\"frm-fluent-form fluent_form_3 ff-el-form-top ff_form_instance_3_1 ff-form-loading ffs_default\" data-form_instance=\"ff_form_instance_3_1\" method=\"POST\" action=\"\" ><fieldset  style=\"border: none!important;margin: 0!important;padding: 0!important;background-color: transparent!important;box-shadow: none!important;outline: none!important; min-inline-size: 100%;\">\n                    <legend class=\"ff_screen_reader_title\" style=\"display: block; margin: 0!important;padding: 0!important;height: 0!important;text-indent: -999999px;width: 0!important;overflow:hidden;\">\u5b98\u7f51\u8be2ch\u1ebf \u0111\u1ed9<\/legend>        <div\n                style=\"display: none!important; 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