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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.' W( L1 N: a) w. [" k- i
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:4 Q- o8 B2 V/ D
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第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.12 b% V* Z$ T) @+ Y
20.101.1 Lawn trimmers
& k- T! u: I% W0 |2 \Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
! a' _% y# M/ l! d, `in Figure 101.
3 ~! A6 A3 Y, K+ _& FThe radius X of the guard shall not be smaller than the major swept radius of the cutting
0 U5 O) _% O5 B( G `5 F S/ L0 whead and the guard shall extend beyond the plane of the cutting element by at least 3 mm
" F! N, O2 x, n: H" \for walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall
_, k [5 r( F9 E: o! I1 W% L: Lextend at least 45° from the axis of the handle on the side where the cutting element is3 u# q5 t) j' I
moving away from the operator and at least 90° from the axis of the handle on the side where B6 R. U4 o6 H# S& w
the cutting element is moving towards the operator. The vertices of these angles lie on the
* \ p0 a6 H% `8 L; U9 u: Kaxis of the cutting head spindle.
4 I, L0 m) M8 R" I7 k5 eIf the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)) W8 O) X# ]6 [6 w2 T+ Q
shall be marked on the lawn trimmer.
a4 `$ O8 u3 c. BCompliance is checked by inspection and measurement. H w- H9 r" D3 a4 \* f
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第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
; S7 z5 T- j8 b3 N3 e* w22.103 A cutting element shall have a kinetic energy of not more than 10 J.) G) G6 u! g( s" `+ |5 J5 x6 J; Y
Compliance is checked by inspection, measurement and test. Polyamide cutting elements
, J2 E ]& G( uare stored for at least seven days in a humidity cabinet under the same conditions as those& H% x4 m3 n" z- m1 e# J' b
required for the test of 15.3 before carrying out the test and measurement.+ H/ W5 {9 v0 Q4 U
For the purposes of this standard, the kinetic energy shall be determined by means of the
w# V0 ?3 U$ i! w4 _; ?following formula:
3 D3 f& b" ]6 z( n( ekinetic energy = ½ mv2 (J)
' l [$ d& t, Kwhere
" U! t* D5 @1 j2 ?4 P9 ]m is the mass of the length L of the cutting element, in kilograms (see Figure 105);
9 P( g( L r' K6 @& l cv is the maximum attainable velocity of point Z which is half-way along the length L of the
5 J# \6 N3 x! |9 _cutting element, in metres per second.% w+ ^7 F ?* o" O# c. [
Therefore: v = 0,1047 n ( r– (L/2))
5 t. r" E& j. o, Y0 a4 fwhere& T8 n' a& \* C& S8 K; U2 A
n is the maximum rotational speed with a full length of line or a new cutter fitted, in
" k% Q5 n) }" K+ Y: Xrevolutions per minute;
3 S D6 n# C" ar is the distance from the axis of rotation of the cutting head to the outer tip of the cutting
/ ?* Z. U5 l5 umeans, in metres;
% M* N/ p3 {+ M& G8 `# lL is the measured length of the cutting element, in metres.
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