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:

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
Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
* I; ?  g" ~# y; s% Iin 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
* U! t! z0 j( S. ?! Rfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
) z9 u& X- R- m( h. ~0 e4 Iextend 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
! X; [4 V1 x2 Y6 |1 ]* othe cutting element is moving towards the operator. The vertices of these angles lie on the
0 D* A% C! f* X+ b% daxis of the cutting head spindle.
1 [+ |: r& {, kIf the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
, u% o- ^2 Z% P; [( e4 vshall be marked on the lawn trimmer.
- R2 G- `+ W1 j% tCompliance is checked by inspection and measurement.

第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
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
are stored for at least seven days in a humidity cabinet under the same conditions as those
required for the test of 15.3 before carrying out the test and measurement.
0 R7 `7 }0 U6 [  M/ fFor the purposes of this standard, the kinetic energy shall be determined by means of the
following formula:
kinetic energy = ½ mv2 (J)
0 [% x/ G& E" F% ^1 Kwhere
# [" |/ b$ D' }$ H" K! G) Fm is the mass of the length L of the cutting element, in kilograms (see Figure 105);
4 m  j2 f+ h1 G! I5 hv is the maximum attainable velocity of point Z which is half-way along the length L of the
+ ~7 [) ?9 X% {1 ?' W2 T6 _- ocutting element, in metres per second.
& y2 F5 f3 P0 P# ]Therefore: v = 0,1047 n ( r– (L/2))
7 \4 _: _/ k0 R7 C0 p' awhere
5 }' ~) W! P5 e: J: B, s$ \6 h  ~9 Hn is the maximum rotational speed with a full length of line or a new cutter fitted, in
revolutions per minute;
r is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
means, in metres;
3 S1 j, _6 ]4 P# a9 }L is the measured length of the cutting element, in metres.

3 d5 A: D9 C( I& L, P
0 A: T! ^* C9 m

kgdihcel123

没看到贵司产品的护罩图片，也不能给出准确的信息：
- N& e: q# S, G1.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。
2.客户操作的方向是否正确

zjfxw

这种现象偶然比较大吧，

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？？

lianhuatang

认证的产品也不能肯定解决实际使用中的可能遭遇。
6 l' D' ]2 g2 A* b+ W, X+ H确定是纯的尼龙线吧？直径应该在2.3mm以内吧？

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

noangelrain

关键你们认证的这不满足 ，是如何拿到证书的