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:
: Z6 V& n6 e0 b; v
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
3 _# \9 U- C, Z! }! H  B8 m1 WLawn 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
8 M( O. J7 e% o% b9 dfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
" H+ m/ q& Q: _, G: d. I6 U5 |extend 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
/ i. w* h! d$ a& c& Kthe cutting element is moving towards the operator. The vertices of these angles lie on the
axis of the cutting head spindle.
If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
* e9 o+ h' l: b6 j  A) Cshall be marked on the lawn trimmer.
$ }5 G' B$ D! O( HCompliance is checked by inspection and measurement.
+ D$ {" m4 ?# _! b; K* a* E
第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
2 a: _6 F* d! r( \# \22.103 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
+ n) x7 ]$ L, a2 bare stored for at least seven days in a humidity cabinet under the same conditions as those
* G+ M3 ^: y/ ~required for the test of 15.3 before carrying out the test and measurement.
& L% p  w- X; Q; n$ _6 PFor the purposes of this standard, the kinetic energy shall be determined by means of the
following formula:
% q; y0 Y7 ]( R* I5 F; Kkinetic energy = ½ mv2 (J)
3 s+ v) u( d  Fwhere
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.
Therefore: v = 0,1047 n ( r– (L/2))
3 V* U- ?5 U3 Q# Hwhere
8 {9 M" q6 X/ L+ B& w$ i' Xn is the maximum rotational speed with a full length of line or a new cutter fitted, in
revolutions per minute;
0 l, O) ], s4 ]" h7 m7 X) ~+ |5 N* Vr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
4 }1 q8 k1 D4 n, z0 q/ a( Hmeans, in metres;
/ @4 S4 Z/ P5 I( r, iL is the measured length of the cutting element, in metres.

8 |( L# K% S) [+ |: q+ c

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。
* f: o' z8 H1 [& t5 T& G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。
- h2 d+ r9 R+ y2.客户操作的方向是否正确