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:

- w1 m$ u2 l6 n  z5 A第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.1
1 I9 }' w' Z3 P20.101.1 Lawn trimmers
9 P, v$ @6 R% I; oLawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
in Figure 101.
& I# u. _; A- ~8 b  i* SThe radius X of the guard shall not be smaller than the major swept radius of the cutting
/ A% P; m# a# ~' F5 \# f2 g4 yhead and the guard shall extend beyond the plane of the cutting element by at least 3 mm
+ Y" a5 E" `  Z# U' s! Vfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
- P3 R- k( ^0 ~8 K2 c+ L7 pextend 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
: O7 L6 Z3 {* vthe cutting element is moving towards the operator. The vertices of these angles lie on the
' n# r9 @3 @4 Paxis of the cutting head spindle.
. ~) D6 W* i6 O6 _' S: X& |4 J2 FIf the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
7 t; @. ^7 Y, E: P9 E9 o/ Fshall be marked on the lawn trimmer.
Compliance is checked by inspection and measurement.

# b" C# }. a* @/ ?第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
+ O8 S. J7 c* k8 e1 b22.103 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
. a; p' k5 a1 [- D# g! [0 h* wrequired for the test of 15.3 before carrying out the test and measurement.
' W( x  n, _  {6 kFor the purposes of this standard, the kinetic energy shall be determined by means of the
following formula:
5 ~2 W5 P1 t6 Gkinetic energy = ½ mv2 (J)
where
- ?3 b" k' O/ F8 r2 w3 |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
+ t& d3 x$ |# N6 _cutting element, in metres per second.
: F0 U0 j8 N# d2 T; [) J3 c1 [9 H6 MTherefore: v = 0,1047 n ( r– (L/2))
where
/ I0 O( U0 j/ a( e! _& Zn is the maximum rotational speed with a full length of line or a new cutter fitted, in
! @! \; J$ s4 j7 Z) M* B0 mrevolutions per minute;
# m. \( A2 t. X* J/ ^" a6 a, ~0 Gr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
means, in metres;
" _. R  C  e; X5 [& r( y# hL is the measured length of the cutting element, in metres.
& U* B" W2 Z; J$ ^. C0 X2 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。
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。
7 ^- Q2 ^% Z: _' L* r2.客户操作的方向是否正确