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.
9 Y4 ~$ _' o: S; s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:
7 Q8 O4 i: H. J" S; V4 W0 U
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
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
for 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
. _" V  e4 C2 G$ T2 {. Lmoving 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
' `: l* v# Y4 r6 t1 N0 ^- daxis of the cutting head spindle.
+ e$ y# {+ E1 o, U8 {0 Z. F7 J& X& hIf the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
: E: A4 Y# d2 ~shall be marked on the lawn trimmer.
3 Z3 T- O2 k+ O6 `7 K8 X0 UCompliance is checked by inspection and measurement.

第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
. I# z7 b* H: O9 `$ f) S0 F& ?" a" u22.103 A cutting element shall have a kinetic energy of not more than 10 J.
5 F: {, e4 S; H0 C. m  J5 a4 QCompliance is checked by inspection, measurement and test. Polyamide cutting elements
% L7 u7 t- z0 O8 ^3 zare stored for at least seven days in a humidity cabinet under the same conditions as those
% A- r' N  m: [9 u- k) xrequired for the test of 15.3 before carrying out the test and measurement.
8 ?  V: d1 G4 f/ f# ]$ wFor the purposes of this standard, the kinetic energy shall be determined by means of the
following formula:
: z1 A! ?! G, I3 A3 m% ?# ukinetic energy = ½ mv2 (J)
- I! J2 J% _3 V1 x7 Gwhere
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
4 r4 Q+ L! V- b5 O- P( J, ~0 Ocutting 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
revolutions per minute;
1 A9 W  R& P5 ~$ l$ gr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
means, in metres;
+ v* p/ Q" Q0 w/ R7 j+ |L is the measured length of the cutting element, in metres.
: |7 ^" r2 C% y: E& z3 D. I* k/ u
; o4 ?$ x# g$ n; F. \

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。
/ |( D: K. X6 ^; J; B$ b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：
0 q4 r8 H+ I, o  T& a6 \( g+ j1.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