轮椅复测与整改的衔接

结论：整改前想清楚，比整改后再来一次要省得多

轮椅测试出现不合格项时，后面的流程是：分析原因 → 制定整改方案 → 实施整改 → 复测。

这个流程如果走得不顺，周期会被反复拉长： 整改不到位第二次复测又不合格；整改引出新问题；复测范围没定清楚导致遗漏；或者样机准备跟不上。

衔接顺畅的关键在于整改之前的几件事： 把原因分析清楚、把整改方案的影响想清楚、把复测范围定清楚。

不合格后的第一步

确认不合格的事实。 数据、条件、判定依据。

了解失效的现象。 在什么条件下、什么部位、什么形式失效。

索取详细信息。 照片、数据曲线、失效位置的描述。

判断是否是样品个体问题。 如果只有一个样品失效而其他正常，可能是个体缺陷。

确认测试条件正确。 排除条件设定或操作的问题。

「索取详细信息」对分析原因很重要。 只知道「静载试验不合格」不足以分析，需要知道在哪个位置、什么载荷下、以什么方式失效。

原因分析

区分直接原因与根本原因。 某个焊缝开裂是直接原因，为什么开裂才是根本原因。

可能的原因类别。 设计（结构、尺寸、材料选择）、材料（性能不达标、批次问题）、工艺（焊接、热处理、装配）、或者样品个体。

验证原因的假设。 如果可能，通过检查或试验验证。

失效位置的信息。 失效位置通常指向原因——应力集中处指向设计，焊缝指向工艺，材料内部缺陷指向材料。

「失效位置」是分析的重要线索。 如果失效发生在设计上的应力集中处，指向设计；如果发生在焊缝或热影响区，指向工艺；如果在看似正常的位置，可能指向材料。

整改方案的考虑

针对根本原因。 只处理表面现象，问题可能换个形式再出现。

留出余量。 不要做刚好达标的整改，批次差异会让刚好达标的方案再次失败。

评估副作用。 加强一处可能使载荷转移到另一处；增加壁厚可能影响装配或重量。

评估对其他项目的影响。 整改可能影响已经合格的项目。

评估可行性。 工艺上能否实现、成本是否可接受、模具是否要改。

「留出余量」是最实际的建议。 整改后自测刚好合格，复测时很可能再次失败——因为存在测量不确定度和样品差异。

复测范围的确定

必测项目。 原不合格项。

受整改影响的项目。 整改改变了什么特性，相关项目要复测。

可免测的项目。 论证不受影响。

新增项目。 如果整改引入了新的考虑。

与实验室确认。 范围应当双方确认，避免复测后发现遗漏。

「受整改影响的项目」要认真分析。 比如加强了车架某处，强度合格了，但重量增加、重心变化，稳定性和重量相关的项目可能需要复测。

样机的准备

复测用的样机必须包含整改。 确认送去的样机确实是整改后的。

数量。 按复测项目确定，考虑破坏性试验。

保留整改前的样机。 便于对比分析。

记录差异。 整改前后的差异记录清楚，便于说明。

一致性。 复测样机之间应当一致。

「确认送去的是整改后的样机」听起来多余，但实际中出现过 ——样机混淆导致复测又不合格，白白浪费一轮。

沟通上的要点

及时沟通。 出现不合格时尽快沟通，不要等完整报告。

信息完整。 提供详细的失效信息。

整改方案的说明。 改了什么、为什么这样改。

复测范围的确认。 双方明确。

时间的沟通。 整改需要多久、复测需要多久。

「及时沟通」能明显缩短整体周期，因为委托方可以在报告出来之前就开始分析和准备整改。

避免反复的做法

整改后自测。 送复测前自己验证一遍。

一次处理多个问题。 如果有多项不合格，一并整改再复测。

留足余量。 前面说过。

分析副作用。 避免解决一个问题引出另一个。

样机准备充分。 避免因样机不足而中断。

「一次处理多个问题」能省下明显的时间和成本 ——逐项整改逐次复测，每次都是完整的一轮往返。

整改类型与复测范围的对应

整改类型	通常需复测
加强结构	强度、疲劳、重量、稳定性
更换材料	相关力学、阻燃、生物相容性
改进焊接工艺	强度、疲劳
更换部件	该部件相关的项目
调整尺寸	尺寸、配合、强度、稳定性
改进电路	电气安全、EMC、温升

这张表可以作为确定复测范围的起点，具体按整改内容调整。

记录的要求

整改与复测的过程应当记录：不合格的情况与数据；原因分析的过程与结论；整改方案与理由；整改的实施记录；复测的范围与理由；以及复测结果。

这份记录在后续的变更管理和审查中会用到，因为整改本质上是一次设计变更。

整改对已有报告的影响

整改是设计变更，可能影响已经出具的报告：

原报告的适用性。 整改后的产品与原报告中的样品不同。

其他市场的报告。 如果产品已在其他市场有报告，也可能受影响。

申报义务。 整改可能构成需要申报的变更。

资料的更新。 说明书、图纸、物料清单的同步更新。

建议整改时一并评估对已有报告和注册状态的影响，而不只关注眼前的复测。

我们的做法

出现不合格项时，我们会及时沟通并提供详细的失效信息 ——失效位置、载荷、方式、照片，因为这些是委托方分析原因的基础。

整改方案由委托方决定，因为它涉及设计和生产，需要委托方评估对产品其他方面的影响。我们可以就整改方案对测试结果的可能影响提供意见。

复测范围我们会给出建议清单并说明依据，委托方如果认为某些项目可以免测，可以提供论证一起讨论。

如果你的产品测试出现不合格需要整改，可以把失效情况和整改思路发过来一起讨论，或者直接联系：132 4819 8029。检测能力见服务介绍，产品分类见手动轮椅检测与电动轮椅检测，案例见案例。

English version

Conclusion. When a wheelchair fails a test, the sequence that follows is analysing the cause, defining a remedial plan, implementing it and retesting. Where that sequence runs badly, the schedule stretches repeatedly: inadequate remediation fails a second retest, remediation introduces new problems, an unclear retest scope leaves something out, or sample preparation falls behind. Smooth handling depends on several things done before remediation: understanding the cause, understanding the consequences of the remedial plan, and settling the retest scope.

The first step after failure. Confirm the failure, covering data, conditions and the basis of judgement. Understand the failure phenomenon, covering under what conditions, at what location and in what manner. Request detailed information, including photographs, data traces and a description of the failure location. Judge whether it is an individual sample defect, where one sample failed and others did not. And confirm that test conditions were correct, excluding setup or operational problems. Detailed information matters for cause analysis: knowing only that static loading failed is insufficient, and the location, the load and the manner of failure are all needed.

Cause analysis. Distinguish immediate from root cause: a weld cracking is the immediate cause, and why it cracked is the root. Consider the categories of cause: design in structure, dimensions or material selection; material in substandard properties or batch problems; process in welding, heat treatment or assembly; or an individual sample defect. Verify the hypothesis through inspection or testing where possible. And use the failure location, which usually points to the cause: a stress concentration points to design, a weld points to process, and an internal material defect points to material. Failure location is the important clue: failure at a designed stress concentration points to design, failure at a weld or heat-affected zone points to process, and failure at an apparently ordinary location may point to material.

Considerations for the remedial plan. Address the root cause, since treating symptoms lets the problem return in another form. Leave margin rather than remediating to just meet the requirement, since batch variation will fail a marginal solution again. Assess side effects, since reinforcing one area may transfer load to another and adding thickness may affect assembly or weight. Assess effects on other items, since remediation may affect items that already passed. And assess feasibility, covering manufacturability, cost and whether tooling must change. Leaving margin is the most practical advice: remediation that just passes self-testing will very likely fail retesting, because measurement uncertainty and sample variation both intervene.

Determining the retest scope. Mandatory items include the failed item. Items affected by the remediation must be retested according to what characteristics changed. Exempt items require a justification that they are unaffected. New items may arise where remediation introduces fresh considerations. And the scope should be confirmed with the laboratory, to avoid discovering omissions after retesting. Items affected by remediation deserve careful analysis: reinforcing part of a frame may satisfy strength while increasing weight and shifting the centre of gravity, so stability and weight-related items may need retesting.

Preparing samples. Retest samples must incorporate the remediation, confirmed before dispatch. Quantity follows the retest items, allowing for destructive testing. Retain pre-remediation samples for comparative analysis. Record the differences clearly for explanation. And ensure consistency between retest samples. Confirming that the samples sent are the remediated ones sounds superfluous and has genuinely gone wrong: sample confusion has caused retests to fail again and wasted a whole cycle.

Communication. Communicate promptly when a failure occurs rather than waiting for the complete report. Provide complete information about the failure. Explain the remedial plan, covering what changed and why. Confirm the retest scope explicitly on both sides. And discuss timing, covering how long remediation and retesting will take. Prompt communication shortens the overall schedule noticeably, since the client can begin analysis and preparation before the report issues.

Avoiding repeated cycles. Self-test after remediation, verifying before submitting for retest. Address multiple problems together where several items failed. Leave adequate margin, as above. Analyse side effects to avoid solving one problem and creating another. And prepare samples adequately to avoid interruption. Addressing multiple problems together saves noticeable time and cost, since remediating item by item means a complete cycle each time.

How we handle it. When an item fails we communicate promptly and provide detailed failure information covering location, load, manner and photographs, since those underpin the client's cause analysis. The remedial plan is the client's decision, involving design and production and requiring their assessment of effects on other aspects of the product; we can comment on how the plan might affect test results. We propose a retest scope with our reasoning, and where the client believes items can be exempted we are glad to discuss a justification.

Send us the failure details and your remedial thinking and we will discuss it. Phone or WeChat: +86 132 4819 8029.