电动打草机线头飞溅伤脚问题

terrywong

广东安规检测
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IEC60335试验指甲

我们一款打草机,在国外遭投诉, 原因是打草线自动切断后,线头飞出,打疼用户的脚趾头.
问题产品在国外, 看不到, 我觉得原因是如下两点, 请各位帮忙分析对不对:
- J# E$ ^) k7 R& _9 w' F5 G
1 a: X, k+ L: m; ~, m第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.1
20.101.1 Lawn trimmers
. E, m- u2 Y  z  m: VLawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
& d/ ~+ c: h/ k9 k9 T; Kin Figure 101.
* N9 `. V0 c$ ]4 aThe radius X of the guard shall not be smaller than the major swept radius of the cutting
0 @! J' |* T- d( K& L2 ~- a9 mhead and the guard shall extend beyond the plane of the cutting element by at least 3 mm
* T6 u6 F  \: }' R# Q! J6 afor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
6 K. s, t; o" G# M: B# p4 mextend at least 45° from the axis of the handle on the side where the cutting element is
moving away from the operator and at least 90° from the axis of the handle on the side where
the cutting element is moving towards the operator. The vertices of these angles lie on the
1 V! b" W" N' r2 M8 aaxis of the cutting head spindle.
If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
" N% A( a) z9 L7 [0 L# U$ O8 T" xshall be marked on the lawn trimmer.
Compliance is checked by inspection and measurement.
0 }5 E& h) a  ?# v
第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
+ F2 T/ ?. t" R% x22.103 A cutting element shall have a kinetic energy of not more than 10 J.
  o) J6 n" z8 f% {+ K8 ]; u8 o* b) |Compliance is checked by inspection, measurement and test. Polyamide cutting elements
are stored for at least seven days in a humidity cabinet under the same conditions as those
1 w! q6 e7 H# [& i* irequired for the test of 15.3 before carrying out the test and measurement.
9 l6 t8 a6 k% a- h- RFor the purposes of this standard, the kinetic energy shall be determined by means of the
following formula:
kinetic energy = ½ mv2 (J)
where
7 x. f4 o3 Z8 ^m is the mass of the length L of the cutting element, in kilograms (see Figure 105);
v is the maximum attainable velocity of point Z which is half-way along the length L of the
& W: ~* C) u* r+ o0 Scutting element, in metres per second.
' G# {1 I4 c4 f+ sTherefore: v = 0,1047 n ( r– (L/2))
; S, U# r( w  w" V6 B0 Cwhere
2 V' P' f4 _! d9 D0 |  o7 u- Pn is the maximum rotational speed with a full length of line or a new cutter fitted, in
" H* h6 `, c8 V3 Z# t: G& Mrevolutions per minute;
! }" i2 l* d" n, B- @r is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
means, in metres;
. i7 V+ W- S6 ~) m2 K3 A+ fL is the measured length of the cutting element, in metres.
, T0 s3 ~; t+ I+ l- G6 L% F! G9 f, J

noangelrain

关键你们认证的这不满足 ，是如何拿到证书的

terrywong

CE-LVD/MD 测试都通过, 也拿到了某机构的GS证书.  但还是有投诉, 证书的严肃性我们暂且不谈, 只想单纯谈论问题, 和解决问题的方法. 不知道我的上述分析对不对, 如果对, 可否告知解决方案, 请各位不吝指教. 谢谢啦

lianhuatang

认证的产品也不能肯定解决实际使用中的可能遭遇。
5 d- v% B' U, v6 O/ v确定是纯的尼龙线吧？直径应该在2.3mm以内吧？

kongyezi

是的可能的，护罩导向问题，以及客户如何操作是否手持方向不对？？

zjfxw

这种现象偶然比较大吧，

kgdihcel123

没看到贵司产品的护罩图片，也不能给出准确的信息：
% e+ H, T: L% O1.防护罩是否存在变形，防护角度是否符合要求，4.6.2（附录2a、2b） 4.6.3（附录 3a、3b），因为护罩变形了，它的底部防护就有可能不密实，尼龙线会飞出来的。
' g- m% X) t" |2.客户操作的方向是否正确