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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.0 M( t0 m7 Z+ a
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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2 f7 ^, I6 i% d7 B第一, 护罩尺寸及角度不对, 参见IEC 60335-2-91, 20.101.1# B% j4 U. N- _! y9 E, I9 D7 b4 w
20.101.1 Lawn trimmers* m' `) i# M2 k/ P8 R
Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown
. |# G$ D5 M) D+ o2 bin Figure 101.0 `# H: t& q& Z* `+ I/ v
The radius X of the guard shall not be smaller than the major swept radius of the cutting/ a* \% r& x) K/ P4 X6 {
head and the guard shall extend beyond the plane of the cutting element by at least 3 mm
' ^/ h9 p1 E' `: i2 _: zfor walk-behind lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall4 W" @! G% R/ F! I$ ?, [; y
extend at least 45° from the axis of the handle on the side where the cutting element is. t5 |- y& {) g0 b g& M9 p! n$ G
moving away from the operator and at least 90° from the axis of the handle on the side where" J" |: c) d8 x' A* `
the cutting element is moving towards the operator. The vertices of these angles lie on the
3 K* _( R' J6 ^0 d! {axis of the cutting head spindle., P, B: h8 _) G; Y+ _
If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s)
7 @* k, U p( A5 I& Lshall be marked on the lawn trimmer.
# |+ z3 r' A6 D- v% E2 nCompliance is checked by inspection and measurement.' [. C) d# G4 \
6 s1 _0 r& }# p' ~, r! Y! M第二, 飞出线头动能太大. 参见 IEC 60335-2-91, 22.103
3 [( ~ f7 r$ {22.103 A cutting element shall have a kinetic energy of not more than 10 J.
' h: ?4 Y- O' a" vCompliance is checked by inspection, measurement and test. Polyamide cutting elements
. [. x% y+ s# {0 w8 P" l" q: k6 ]- Lare stored for at least seven days in a humidity cabinet under the same conditions as those8 D: F; W; v- M1 M; X
required for the test of 15.3 before carrying out the test and measurement.8 M6 M' I9 l( F2 e4 {
For the purposes of this standard, the kinetic energy shall be determined by means of the
1 L4 j6 Q, D" `, T1 Ffollowing formula:2 E6 J' S8 i7 T) V
kinetic energy = ½ mv2 (J), A5 w% C' n4 q
where9 D, z$ P3 Y% n, g- p" W
m is the mass of the length L of the cutting element, in kilograms (see Figure 105);
# `# X5 N- X" |/ ]v is the maximum attainable velocity of point Z which is half-way along the length L of the" D# Y% @6 I( Q) S) z' L
cutting element, in metres per second.+ R" X; G' j/ ~$ _) H
Therefore: v = 0,1047 n ( r– (L/2))2 }6 m! U& `5 u
where
9 ^# N2 w' N9 B9 j- bn is the maximum rotational speed with a full length of line or a new cutter fitted, in
" ^ ]# q3 E+ E/ Q7 prevolutions per minute;3 i* K8 u# g+ t
r is the distance from the axis of rotation of the cutting head to the outer tip of the cutting9 [* x4 p& F& p [! ^. n$ I
means, in metres;
4 Q. B6 {5 Y& F5 L- \+ O7 ML is the measured length of the cutting element, in metres.
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