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:
0 ?4 g: ~( E# w" p
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.
% G7 p" }0 ~3 k# U9 jThe 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
/ ?- @" w+ ~! W" a7 W8 [extend at least 45° from the axis of the handle on the side where the cutting element is
; w; N, z  B: I4 ?, Omoving away from the operator and at least 90° from the axis of the handle on the side where
. O/ x- X7 s. j: _the cutting element is moving towards the operator. The vertices of these angles lie on the
3 q* t$ Z$ U( m# U! _axis of the cutting head spindle.
4 m# i8 d; @) ~0 @If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
) P- n/ A0 x0 I' d; U- D" v9 Ishall be marked on the lawn trimmer.
. G: x( k- u' k/ S8 d, D8 W6 n* ACompliance 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.
- o; }. e  E% r# D8 k" V, l* q4 M2 RCompliance 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
* e; w3 E0 x# w6 r0 E5 [required for the test of 15.3 before carrying out the test and measurement.
For the purposes of this standard, the kinetic energy shall be determined by means of the
# _6 c/ v! f: }) sfollowing formula:
/ o0 Z6 ^* s3 K3 Z7 K; C0 E* ^8 @! {kinetic energy = ½ mv2 (J)
where
; n0 G/ R- h9 V1 n4 B0 ]& q1 Mm 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
- ^& p9 Q; t7 ?# Y. O) Y8 mcutting element, in metres per second.
" D! K; G# q3 x: Q8 X- g# sTherefore: v = 0,1047 n ( r– (L/2))
% Z1 F# J  @# Q" gwhere
n is the maximum rotational speed with a full length of line or a new cutter fitted, in
revolutions per minute;
" K; k4 P4 ^$ [r is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
$ h# j9 n4 j4 E7 ^* N+ F, [5 smeans, in metres;
& E0 ^8 g. k; N& }: oL is the measured length of the cutting element, in metres.
2 u+ H2 r+ \, I# F
- x( i, ^- `' k7 M# A+ j3 Q: r

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。
8 m# v+ L( [4 e8 F% _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。
# _" f/ i5 s# ]' d2.客户操作的方向是否正确