安规网

标题: EN71 磁铁测试 [打印本页]
作者: peterxu    时间: 2009-12-30 15:06
标题: EN71 磁铁测试
EN 71磁铁测试的要求是不是磁通量不能超过50平方千高斯平方毫米,或者不能是小部件,两个条件必须同时不满足还是只要有一个条件不满足就可以FAIL了呢 ?谢谢& h8 v0 K6 z7 N0 R; W# u4 D% F
4.23 Magnets (see A.51)* S3 l; q) ]; y
4.23.1 General
( f) [/ Z7 a$ |) ~The requirements in 4.23.2 do not apply to functional magnets in electrical or electronic components of toys.
1 A6 J% m; W9 ?6 YThe requirement in 4.23.3 does not apply to magnetic/electrical experimental sets in which all magnets have a
8 V: W3 n9 n. m- z& j/ cmagnetic flux index less than 50 kG2mm2 (0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or
$ O" Y7 |. X2 O9 {9 m1 f3 p% Ydo not fit entirely in the cylinder when tested according to 8.2 (small parts cylinder).; c% f( k: Y/ B1 t* @8 b, U
4.23.2 Toys other than magnetic/electrical experimental sets* P, ]6 A- j1 J' C
a) Any loose as-received magnet(s) and magnetic component(s) shall either have a magnetic flux index6 ?0 c. z( _4 z  q& y
less than 50 kG2mm2 (0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or shall not fit9 z; h3 {" V+ g8 _) R) X
entirely in the cylinder when tested according to 8.2 (small parts cylinder).
; X6 T# E. z3 _6 b! Cb) Any magnet(s) and magnetic component(s) that become(s) released from a toy, or from a loose asreceived( @8 \5 E0 M; ~! v
magnetic component, when tested according to 8.3 (torque test), 8.4.2.1 (tension test,
8 \0 }: s  ~: v$ bgeneral), 8.4.2.2 (tension test, seams and materials), 8.5 (drop test), 8.7 (impact test), 8.8
$ m4 J. q0 u  m( y- |(compression test), and finally, for magnets that are accessible but not grippable (as specified in
; ]$ w) j: z9 f: U3 b# x, @8.4.2.1), 8.34 (tension test for magnets), shall either have a magnetic flux index less than 50 kG2mm2) {5 z7 D# Y# w' R9 H2 E0 ?
(0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or shall not fit entirely in the cylinder
7 {! q% y  j, f" u  q; kwhen tested according to 8.2 (small parts cylinder).$ z) j. ]- e: @2 O9 E  x2 C9 }
NOTE An example of a magnet that is accessible but not grippable could be a magnet that is recessed.  |" w8 b; c( m* Z5 C
c) Wooden toys, toys intended to be used in water, and mouth-actuated toys shall be tested according to
$ A& t  z$ z4 v8 n3 k6 [! m8.9 (soaking test) before being tested according to 4.23.2 b) above.4 ~; d% [* s4 S" F' B7 D7 D, L" b
4.23.3 Magnetic/electrical experimental sets- A  e. y0 e( _, m  D% y" b
Magnetic/electrical experimental sets intended for children over 8 years shall carry a warning (see 7.20).
作者: peterxu    时间: 2009-12-30 15:20
ASTM F963和EN71就是有这些细微的差别....呵呵~~~
作者: hewei    时间: 2009-12-30 15:32
要同时满足" G6 ?2 l. Z' y- A( o
磁通量超过50,但不是小物件没危险性
9 b) B! b4 {( O1 v$ E是小物件,但磁通量不超过50,只有小物件危险,而没有磁铁的危险4 R- c) r& @1 `4 N* S' _8 p0 i7 {
针对磁铁的危险就必须同时满足,
作者: peterxu    时间: 2009-12-30 15:33
但EN71里用的词是OR而不是AND呀.....谢谢HEWEI
作者: yanfenghmm    时间: 2009-12-30 15:37
不是太了解这方面的东西，还请高手指点啊
作者: jackypang    时间: 2009-12-30 15:42
我覺得應該這樣理解：
2 H/ j* q) G* T& v. Z: q* w+ \0 d$ y  首先磁鐵本身不能為小物件或小物件組成部件; 如果是小物件或小物件組成部件，則磁鐵的磁通量應該小於50平方千高斯平方毫米。可能簡單地說，如果磁鐵的磁通量大於50但不是小物件的話會有危險。而如果大於50又是小物件的話就會更加危險。
& v' a2 z4 N' B- Y1 I
# V. V, D5 Q- h; p, s  \下面借用ASTM F963的定義參考一下：7 m; h' n: y6 j% n7 A
ASTM F963 definitions: 3.1.33 hazardous magnet—a magnet which has a flux index >50( b- u' p" G3 l* Y6 ~- ?
3.1.34 hazardous magnet component—any part of a toy that is a small object (refer to 4.6 and Fig. 3) and which contains an attached or imbedded magnet which has a flux density >50 as determined in accordance with the test method in 8.24.1.6 l; b) U/ ~) K( W. s* U7 }
EN71
作者: peterxu    时间: 2009-12-30 15:47
其实我的看法是和大家一样的...就是现在标准上EN71用的是or,ASTM用的是and,歧义就这样产生了..所以我想了解下大家在平时做测试时是按照什么来判PASS或者FAIL的呢?谢谢!
3 a5 H7 r2 ]# C! A7 J) p& g% j$ c我的想法是严格按照标准来做,免得别人来和你钻字眼...大家认为呢??
作者: peterxu    时间: 2009-12-30 16:54
大家有没有想过有些磁铁磁通量很大,吸力很大,但是不是小部件,在玩耍过程中互相吸引到一起打到手指而造成伤害呢??那应该是PASS还是FAIL呢??
作者: jackypang    时间: 2009-12-30 17:29
這也許是一個新的研究問題，到時標准可能又要修改了。有可能是二種趨勢：, b  o. N' j2 A6 ]& ]/ E
1. 所有標准加大小物件測試筒的尺寸。( }2 O) I2 ?/ K6 |8 Q! e7 @1 j
2. 再修改磁鐵玩具的要求。* x6 S/ W: f4 D* B- l. j) Z
  E8 {+ @) ]: D  q* {1 g2 h6 V
至少你現在上面所說的按標准說是PASS，但建議改善。
. @; m" }$ i/ r7 c' [% ?
& K8 s. a! j6 r, R5 L% @
作者: peterxu    时间: 2009-12-30 17:46
现在主要的问题是ASTM F963-08的危险磁铁的定义是必须是小部件,而EN71里却用了OR这个词,所以我有点迷糊了,现在磁通量是超过了50,但不是小部件....按照EN71的"OR"来说的话不就是说只要超过50或者是小部件就会FAIL,而不是既超过50又是小部件才会FAIL......
作者: jackypang    时间: 2009-12-30 18:49
引用第9楼peterxu于2009-12-30 17:46发表的  :
" W7 k6 p% q4 ?& g现在主要的问题是ASTM F963-08的危险磁铁的定义是必须是小部件,而EN71里却用了OR这个词,所以我有点迷糊了,现在磁通量是超过了50,但不是小部件....按照EN71的"OR"来说的话不就是说只要超过50或者是小部件就会FAIL,而不是既超过50又是小部件才会FAIL......
) n) M9 C0 C4 z- {9 `2 b/ _+ q
4.23.2 Toys other than magnetic/electrical experimental sets
& A0 F2 k, L9 P( v" K* e4 Aa) Any loose as-received magnet(s) and magnetic component(s) shall either have a magnetic flux index
0 Q: v4 E, |) V( Q+ |less than 50 kG2mm2 (0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or shall
not fit
entirely
in the cylinder when tested according to 8.2 (small parts cylinder).- c+ T4 w1 M# k

: e; W$ I5 ?% c% e7 y( _! y8 u, ?8 i, d
我認為你上面這種情況是PASS這個要求的。



欢迎光临 安规网 (http://bbs.angui.org/) Powered by Discuz! X3.4