1、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 381-1 February 1993 UDC 614.897.1 : 687.175 : 621.936.6 : 620.17 Descriptors: Personal protective equipment, work clothing, accident prevention, protective clothing, legs, chain saws, shock resistance, test benches, specifications English version
2、Protective clothing for users of hand-held chain saws - Part 1 : Test rig for testing resistance to cutting by a chain saw Vetements de protection pour utilisateurs de scies chaine tenues la main - Partie 1 : Banc dessai pour les essais de rsistance la coupure par une scie chaine Schutzkleidung fr d
3、ie Benutzer von handgefhrten Kettensgen - %il 1 : Prfstand zur Prfung des Widerstandes gegen Kettensgen-Schnitte This European Standard was approved by CEN on 1993-02-20. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European
4、 Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, Fr
5、ench, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland,
6、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B- 1050 Bruss
7、els 0 1993 Copyright reserved to CEN members Ref. No. EN 381-1 : 1993 E CEN EN*38L-L 93 = 3404589 004L89L Tb4 Page 2 EN 381-1 : 1993 Foreword This European Standard was prepared by the technical committee CEN/TC 162 Protective clothing including hand and arm protection and lifejackets, of which the
8、secretariat is held by DIN. This European Standard has been prepared under a mandate given to CEN by the Commission of the European Communities and the European Free Trade Association, and supports essential requirements of the EC Directive(s). This European Standard shall be given the status of a n
9、ational standard, either by publication of an identical text or by endorsement, at the latest by August 1993, and conflicting national standards shall be withdrawn at the latest by August 1993. The Standard was approved and in accordance with the CENKENELEC Internal Regulations, the following countr
10、ies are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Foreword O Introduction 1 Scope 2 Normative references 3 Definition
11、s 3.1 Chain saw 3.2 Resistance of cutting 3.3 Cut-through 3.4 Chain stopping time 3.5 Free-running stopping time 3.6 Threshold chain speed 3.7 Chain slipping 3.8 Clogging 3.9 Chain braking 3.10 Cutting line 4 Principles 5 Apparatus 5.1 Major components of test rig 5.2 Power unit and connecting devic
12、e 5.3 Saw unit 5.4 Moment of inertia 5.5 Calibration pad mount 6 Calibration materials 6.1 Calibration pads 6.2 Control of calibration pads 6.3 Other calibration 7 7.1 Introduction 7.2 Starting up the rig 7.3 Free-running stopping time 7.4 Measurement of chain speed 7.5 Calibration with clogging mat
13、erial Annex A (informative) Supplementary information on calibration pads Annex B (informative) Cutting in Dlastic bar Calibration of the test rig (pads) PwZe 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 5 6 6 7 7 7 7 7 7 7 7 7 8 10 10 CEN ENx38L-II 93 = 3404587 0043892 9TO M O Introduction This European Sta
14、ndard forms part of a series concerned with personal protective equipment designed to protect against the risks arising from the use of hand-held chain saws. No protective equipment can ensure 100 % protection against cutting from a hand-held chain saw. Nevertheless, experience has shown that it is
15、possible to design protective equipment which offers a certain degree of protection. Different functional principles may be applied in order to give protection. These include: - chain slipping: on contact the chain does not cut the material; - clogging: fibres are drawn with the chain into the drive
16、 sprocket and block chain movement; - chain braking: fibres have a high resistance to cutting and absorb rotational energy, thereby reducing the chain speed. Often more than one principle is applied. 1 Scope This first Part of this European Standard specifies the test rig to be used to assess the re
17、sistance of personal protective equipment to cutting by hand-held chain saws. This Part also describes the calibration procedure. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the
18、appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the p
19、ublication referred to applies. prEN 381-2 prEN 381-3 prEN 381-4 prEN 381-5 prEN 381-6 prEN 381-7 prEN 381-8 prEN 381-9 IS0 4915 : 1991 IS0 3386-1 : 1986 Page 3 EN 381-1 : 1993 Protective clothing for users of hand-held chainsaws - Part 2 : Dst method for leg protection Part 3 : Dst method for boots
20、 Part 4 : Dst method for chainsaw protective gloves Part 5 : Requirements for Leg protection Part 6 : Requirements for boots Part 7 : - a saw unit with a defined moment of inertia including shaft, flywheel, sprocket, chain and bar; - fixture for saw unit; - test piece mounts for samples; - instrumen
21、tation. The general arrangement of the test rig is shown in figure 1. Mountina for sorocketibar Chain Guide bar / f- I L IIUI ILUIIIU I Pivot Sprocket Sample Figure 1. General arrangement of test rig 5.2 Power unit and connecting device The power unit shall be able to drive the saw chain at the requ
22、ired range of chain speed. For calibration purposes the test rig shail be able to drive the chain with speeds of 19 m/s and 21 m/s. For testing purposes the test rig shall also be able to drive the chain with speeds as required in the relevant Parts of the standard at the moment: - Part 2 %st rig fo
23、r leg protection; - part 3 Test method for boots; - Part 4 Test method for chain saw protective gloves; - Part 8 Test method for chain saw protective gaiters. NOTE. For future development a higher speed possibility is recommended. CEN EN+381-1 93 = 3404589 0043894 773 = It shall be possible to disco
24、nnect the power unit from the saw unit. 5.3 Saw unit 5.3.1 Cmponents Bar: Sandvik symmetrical 11-tooth sprocket nosed, nominal groove width 1,50 mm, nominal length 330 mm (13”) Chain drive sprocket: Oregon 7-tooth rim sprocket. Flywheel: Moment of inertia of rotating parts around output shaft, inclu
25、ding shaft, flywheel and all retaining devices but excluding chain and sprocket: 0,47 x kgm2, Tolerance I 1 %. Saw chain: Oregon 8,25 mm (0,325”) pitch, 21 LP, 56 chain links Chains are to be conditioned according to 7.5.1. Clutch Lubricating system: A device shall make it possible to apply a contin
26、uous stream of oil to the guide bar and saw-chain. The rate of application shall be (2 i 0,s) ml/min. White oil Viscosity at 40 O C : 155 mm2/s Viscosity at 100 O C : 15,5 mm2/s Density at 15 O C : 880 kg/m3 Oil type: NOTE. Sandvik, Oregon, Fhgerdala Industri, Exceii, Hls Troisdorf AG, Blount UK Ltd
27、., Stihl and Eng Tex ABS articles mentioned in this standard are examples of suitable products available commercially. This information is given for the convenience of users of this standard and does not constitute an endorsement by CEN of these products. 5.3.2 Release system. A device shall make it
28、 possible to disconnect the power from the saw unit at the same moment as or momentarily before the saw unit is released and ailowed to pivot downwards. 5.3.3 Instrumntation. A tachometer for the measurement of chain speed with an accuracy 0,l m/s. It shali be possible to record the speed at the tim
29、e of release. Instrument for measuring chain stopping time, accuracy 0,l s. 5.3.4 Additional pcqications. The dimensions of the sprocket surroundings shall be as indicated in figure 2. Page 5 EN 381-1 : 1993 15 I_ 0.8 Dimensions in millimetres. Figure 2. Dimensions in sprocket surroundings The chain
30、 tension shall be adjustable. The free running stop time without chain shall exceed 25 s. Lateral stiffness of guide bar, measured by the centre of the nose wheel shall be less than 10,O mm at a lateral force of 50 N. The machine is not fitted with a cover of the chain drive sprocket. NOTE. This req
31、uirement does not preclude a guard to protect the operator. Such a guard shail not interfere with the testing. 5.3.5 Fixture for saw unit 5.3.5.1 Arrangement dimions. The arrangement shail be such that the centre of gravity of the saw unit shall be offset from the pivot of the saw unit in such a way
32、 that, at a distance of (360 f 2) mm from the pivot, the gravitational force shall be (15,O f 0,5) N. This is the contact point. The cutting line shall lie in the same horizontal plane as the centre line of the pivot (see figure 3). CEN EN*38L-L 93 = 3404589 0043895 bOT Page 6 EN 381-1 : 1993 r-. I
33、I c Dimensions in millimetres. Figure 3. Arrangement of test rig at time of cutting The horizontal distance from the centre of the pivot to the centre of the sprocket shall be (130 f 1) mm. 5.3.6.2 Saw unit turning ability. The saw unit shall be able to turn freely in the vertical plane around the h
34、orizontal pivot at least in the range: - up 20 mm, - down 100 mm, measured 360 mm from the pivot. NOTE. It is allowed to include certain stops in order to prevent the saw chain damaging the test piece mount. 5.4 Moment of inertia. The moment of inertia of the saw unit around the pivot shall be (0,30
35、 f 0,05) kgm2. 5.5 Calibration pad mount 5.5.1 hsition The sample mounts shall be horizontally positioned with a specified angle to the guide bar. The horizontal distance from the centre line of the pivot to the centre line of the sample mounts shall be (360 f 2) mm. The centre line of the pivot and
36、 the top of the sample shall be in the same horizontal plane. Prior to testing, the saw unit shall be tilted about the pivot in such a way that the vertical distance between the lowest surface of the teeth on the saw chain and the surface of the sample at the point of contact is (3 f 1) mm as shown
37、in figure 4. 5.5.2 Shupe and materials The calibration pad mount is made up of a rigid base, covered with a layer of flexible cellular material (see figure 5). Upperside shape: cylindrical, diameter (100 f 2) mm, plus the thickness of the covering material. Base material: rigid material, e.g hardwoo
38、d. Covering material l): (14 f 2) mm thick layer of flexible cellular material of copolymer foam of ethylene vinyl acetate with a specific density of (50 f 2) kg/m3 and a compression stress value at 40 % compression (CV 40) of (75 f 10) kPa as tested in accordance with IS0 3386-1 : 1986. y-. I o m/s
39、 c I Dimensions in millimetres. Figure 4. Arrangement of test rig immediately before testing ) The covering material can be obtained from Fagerdala InduStri AB, S-139 O0 Varmd 0, Sweden with reference No. AZ 450. CEN ENx383-3 93 W 3404589 OO4l18Sb 546 W Page 7 EN 381-1 : 1993 Dimensions in millimetr
40、es. Figure 5. Example of calibration pad mount and fixture device 5.5.3 Calibration pad fixture device The device is fitted to the rigid base material of the calibration pad mount on the side furthest from the pivot. It consists of: a) a row, at least 800 mm long, of spikes with a distance of 30 mm
41、between each spike; b) a row, at least 800 mm long, of holes with a distance of 30 mm between each hole, each hole being large enough to accept a spike. An example of a fixture device is shown in figure 5. 6 Calibration materials 6.1 Calibration pads The calibration pads shall be (300 f 10) mm x (70
42、0 f 10) mm. The pads21 are produced for this test method according to the description given in annex A. Seams: 1) Straight seam 10 mm from the edge; the seam shall go around all edges of the thread i00 “/o polyester NM 8011; approximately 3 stitcheslcm; stitchtype according to IS0 4915 No. 301. 2) O
43、ne needle 3 thread overlock around edges; threads 100 % polyester NM 8011 + 150 dtex; approximately 5 stitcheslcm; stitch type according to IS0 4915 No. 504. Pad; 6.2 Control of calibration pads Each new batch of calibration pads must be compared with older batches, the lab has to keep a record of t
44、hese tests. 6.3 Other calibration Annex B contains an alternative calibration method currently being studied. 7 Calibration of the test rig 7.1 Introduction The calibration procedure consists of the following parts: a) before any cut, checking of free running stopping time; b) before each complete t
45、est of a product (see product standard parts), checking of cutting into calibration pads containing clogging material. 7.2 Starting up the rig Before starting the rig checks should be made to ensure that the guide bar chain and sprocket are clean and free of any fibres or other extraneous material.
46、The motor is started and the chain speed is increased until approximately 20 m/s. The chain is warmed up. The free-running stopping time is checked. 7.3 Free-running stopping time The free-running stopping time is checked before each cut. It shall be (4,O f 0,2) s at a chain speed of (20,O f 0,2) m/
47、s. 7.4 Measurement of chain speed The speed of the saw chain is measured at release. 2, The calibration padsa can be obtained at EngTex AB. S 56500 Mullsj, Sweden, with reference No. 027/110-5901 CEN EN+383-3 93 3404589 0043897 482 Page 8 EN 381-1 : 1993 7.5 Calibration with clogging material (pads)
48、 7.5.1 Saw chain conditioning The cutting edges of each cutter link in the saw chain are checked and restored prior to use using a commercial grinding machine3). Thii is done by lightly touching the edges X,Y and Z (see figure 6) on to the grinding wheel of the grinding machine. The grinding wheel4)
49、 shall meet the following specifications: - grit type: 60 grade M, structure 5 - radius of profile: 2,4 mm - nominal thickness of grind wheel: 4,8 mm The height of the depth gauges of each cutter link are then checked. These shall be (0,64 f 0,05) mm (see figure 7). After conditioning the mass must be (222 f 2) g. Chains failing to meet these requirements are discarded. 7.6.2 Attachment qf calibration pad The calibration pad is mounted with the long edge parallel with the axis of the mount using the fixture device. The pad is passed over the top of the mou
