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:
3 `( u- S3 g0 L# i: Y6 X- w! C
6 T8 W; X; y" A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
/ @- u& U5 r! |* j% [& KLawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
in Figure 101.
The radius X of the guard shall not be smaller than the major swept radius of the cutting
head and the guard shall extend beyond the plane of the cutting element by at least 3 mm
! A0 v; T" Q# {( S0 C6 j+ Dfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
extend at least 45° from the axis of the handle on the side where the cutting element is
6 v8 }. ^% u# j- Fmoving 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
8 S; k7 ~$ k. o" n7 Q( ~+ Z; yaxis of the cutting head spindle.
If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
shall be marked on the lawn trimmer.
: O: l" k' ^$ w. K$ ~, gCompliance is checked by inspection and measurement.
" C% |4 _0 @* H6 C# z& e5 e+ ]
+ _* ?$ H9 G8 Y/ C3 a9 C1 O第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
, |- f$ K7 x" o22.103 A cutting element shall have a kinetic energy of not more than 10 J.
Compliance is checked by inspection, measurement and test. Polyamide cutting elements
! W# D2 u! h4 D7 w6 [8 Rare stored for at least seven days in a humidity cabinet under the same conditions as those
1 j/ E& v* Y7 T. i2 erequired for the test of 15.3 before carrying out the test and measurement.
  _2 K' S( U: l5 Y, o5 U5 Z( xFor the purposes of this standard, the kinetic energy shall be determined by means of the
/ a* A$ t! w9 `; H2 cfollowing formula:
3 a4 F; ~% v* t5 a/ Skinetic energy = ½ mv2 (J)
where
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
cutting element, in metres per second.
* y! N. r* W. s: {% o; l( {Therefore: v = 0,1047 n ( r– (L/2))
. A2 q% E. c4 O5 g# L- \% h- zwhere
n is the maximum rotational speed with a full length of line or a new cutter fitted, in
revolutions per minute;
) h+ H6 G3 \% x- Mr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
2 S# a6 ]8 P, ~3 Nmeans, in metres;
! Q/ d4 A7 L& b- R# G! P# AL is the measured length of the cutting element, in metres.
2 }& l4 |) z- T  W* Y& K

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。
" P/ t% c6 U5 P1 v6 y2 p: s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：
1.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。
5 `9 z0 T9 I2 n# U" j3 Y2.客户操作的方向是否正确