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引用第3楼kingfan于2009-08-18 18:45发表的 :
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& ^$ h4 J, h! C5 ~3 Y没有必要用那么复杂的方法。因为标准中对80度温度的要求是“可能”达到,而金属是优良热导体,且,10平方厘米面积也不大,温度梯度不会很大。所以,只要金属零件面积就可以了。 " a. A) p# M" h% f; Y: n
1、GB的标准很多都来源于欧盟或ISO标准。关于金属与非金属的热伤害可以参考EN563,不可以凭主观判定其是否可以接受。EN563已经考虑热传导问题和握持时间。% C% T* ]2 h4 `6 D* {, X5 @* S
2、不通过布温度监控点如何确定10平方厘米?5 b- ^+ Q: O! s4 b K) V
3、试问为什么定在80度?为什么定在10平方厘米?
: l/ g4 q9 J) L1 U& c/ h& [5 Z标准已经用数字客观化,实际操作就不应主观判定是否可以接受,否则10平方厘米在这里将成为一纸空文。
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; E, r: E- _3 ^请参考一些其它产品的同类要求:* _ x9 }1 p: P, W! _
1、prEN15503:20065.2.2 Hot parts guarding6 n9 `+ S1 q; I0 k6 i" Z
Inadvertent accessibility to hot parts shall be determined by compliance with prEN 14930:1995.( Q/ @9 |! s- G: _# b2 h
For the purposes of this test normal operation, as defined in 3.10, shall be considered as normal use and any& r% E2 M$ f1 l, r8 ], n
metallic part of the machine that has a temperature of over 80 oC or plastic part that has a temperature of3 d% F$ M$ F2 S6 Y, B/ d9 g
over 94 oC when measured according to prEN 14930:1995 shall be considered a hot part.! W+ L) n8 F# K/ O
The inside and end of the exhaust pipe shall be exempt from the requirements of this test. 2、pr EN14930:2005 Clause 7
* E; n9 a& [4 M8 Y3、EN ISO11806:1997 CL4.17/ I4 f' d% S7 Z
4、EN ISO 11681:2004 CL 5.15Silencers other than those mounted at the front of saws shall be provided with a guard as protection against contact so that the accessible area does not exceed 10 cm2. The temperature for the accessible parts of the machine as defined above, as well as the guard for the cylinder, shall not cause a hazard to the operator. |
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