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:
, p7 H0 {: u, j, D( U
6 s* A* m1 \% a9 F  B0 A第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.1
/ c% T/ V' Q+ `2 w20.101.1 Lawn trimmers
Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
) h% p3 J! m( ^& ^! t$ Rin 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
( c; m" x/ m0 qfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
; P! l9 [8 T* M* ]3 e1 Eextend at least 45° from the axis of the handle on the side where the cutting element is
  e& ~" I$ y  i2 S. Cmoving away from the operator and at least 90° from the axis of the handle on the side where
1 }6 Z; H: D% W# H: p: a( f3 jthe cutting element is moving towards the operator. The vertices of these angles lie on the
axis of the cutting head spindle.
2 b1 ~* G  g: N2 PIf 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.
4 V0 _1 U2 B- KCompliance 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.
+ f1 X; Q6 b0 F+ `# _For the purposes of this standard, the kinetic energy shall be determined by means of the
) G, f! z+ a0 Kfollowing formula:
kinetic energy = ½ mv2 (J)
( ]8 G" b( ?& p4 u  jwhere
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
1 n  E+ }7 o3 I" Q* ecutting element, in metres per second.
Therefore: v = 0,1047 n ( r– (L/2))
where
n is the maximum rotational speed with a full length of line or a new cutter fitted, in
5 R+ n7 B5 d! a3 D4 G% Srevolutions per minute;
3 D# D3 l+ P! i7 B# }9 Z( U5 tr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
# v$ @' P7 T5 H  ]& s/ J' \means, in metres;
L is the measured length of the cutting element, in metres.
. [, |9 C5 V% V. ?
; \( v1 i/ F: z+ d0 e) O) P

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。
$ b9 ]6 W1 v: }3 `/ D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：
. B# N1 q% @, d8 w5 K1.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。
# U  U. n: @7 H0 d! o2.客户操作的方向是否正确