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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.
( S4 M- d* M+ x5 v" ~+ O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:
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9 n3 O3 u v' W8 {6 k0 u8 y第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.1
3 v. Y8 N! h, g+ r1 f. X20.101.1 Lawn trimmers2 r" b1 N& |/ t( r
Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown& r& Y8 ~- c4 a4 {% e% w& r
in Figure 101.1 Q z6 N5 n# B! Q1 |& N& U* r
The radius X of the guard shall not be smaller than the major swept radius of the cutting
+ k. |6 ?2 E$ s2 c% ehead and the guard shall extend beyond the plane of the cutting element by at least 3 mm7 N9 ~% x! B( U& H0 z+ T
for walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall/ P C+ J' @; M$ h
extend at least 45° from the axis of the handle on the side where the cutting element is
( Z& d+ ~# o4 [- g+ xmoving away from the operator and at least 90° from the axis of the handle on the side where
) ?4 G. f* q, {/ N! k* Tthe cutting element is moving towards the operator. The vertices of these angles lie on the$ O3 C! R' w5 q- \
axis of the cutting head spindle.
( n: X2 W+ F1 v8 X5 lIf the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)" }. ~! u* A" Z" X2 [
shall be marked on the lawn trimmer.
; n; k7 H9 e$ eCompliance is checked by inspection and measurement.- o9 o- d* d1 a, R! o8 M+ f
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第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
+ O' d7 K) z. @22.103 A cutting element shall have a kinetic energy of not more than 10 J.
3 a3 d- x v0 i6 iCompliance is checked by inspection, measurement and test. Polyamide cutting elements% e, P3 _+ f8 `0 x) `( T8 a
are stored for at least seven days in a humidity cabinet under the same conditions as those8 A4 T0 [; _+ F1 @# U* Y, v+ E
required for the test of 15.3 before carrying out the test and measurement.# [% Q7 p( F5 @8 O/ _
For the purposes of this standard, the kinetic energy shall be determined by means of the4 s# h7 L+ Q$ y
following formula:
7 ?2 j0 T: V% Z: L. [kinetic energy = ½ mv2 (J)+ P2 V' \! f, y, G0 E. d9 \
where0 E8 [, o% y: r+ V0 p9 _
m is the mass of the length L of the cutting element, in kilograms (see Figure 105);
: b1 w. X) ^' F) t! \v is the maximum attainable velocity of point Z which is half-way along the length L of the
% W0 p. {* R$ x# F5 E; Ucutting element, in metres per second.
$ o' E1 h; B! U8 r4 WTherefore: v = 0,1047 n ( r– (L/2))2 _& x6 G; X V4 v
where
6 X6 I8 d0 {( X$ C$ j% _2 C& cn is the maximum rotational speed with a full length of line or a new cutter fitted, in
. M3 H. R4 I+ R5 _: F, ^% Orevolutions per minute;
! ?; T- V* l" Pr is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
2 ~# ~" p$ B0 v& U5 P6 Z1 Jmeans, in metres;
" z$ |5 m0 k' t3 uL is the measured length of the cutting element, in metres.
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