ISO-1074-1991.pdf
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1、INTERNATIONAL STA.NDARD ES0 1074 .: -7- . Second edition 1991-03-15 1 . : Counterbalanced fork-lift trucks - Stability tests Chariots b) travelling with the mast or fork arms tilted rearwards and the load in the lowered (travelling) position on substan- tially firm, smooth and prepared surfaces; c)
2、operating with the load centre of gravity approximately on the longitudinal centre-plane of the truck. 3.2 Operating conditions other than normal When the operating conditions differ from those stated in 3.1, it is necessary to use either a) a truck complying with other International Standard(s) cov
3、ering the different specific conditions, e.g. IS0 57671); or b) a truck, the stability of which is agreed upon between the interested parties. This agreed stability shall not be less than that required by the tests specified for normal operating conditions in 3.1. 4 Stability tests for fork-lift tru
4、cks 4.1 Test requirements The stability of these trucks shall be verified by means of one of the procedures described below. For trucks with a rated ca- pacity up to and including 10 000 kg, the tilting platform test shall be used to verify stability in the event of a dispute. 4.2 Verification proce
5、dure 4.2.1 Tilting platform A test platform which can be tilted about one side shall be used. A truck being tested for stability is placed on the initially horizontal test platform, in the conditions specified in 4.3 and, successively, in each of the positions described in table 3. 1) IS0 5767 : 197
6、%. Industrial trucks operating in special condition of stacking with the mast tilted forward - Stability tests 1 -,-,- IS0 1074 : 1991 (El In each of these tests, the test platform shall be tilted slowly to the slope indicated in table 3. The truck is considered stable if it passes all tests without
7、 overturning. For the purposes of these tests, overturning is defined as the test platform slope value which, if increased, would cause over- turning of the truck. It is permissible in lateral tests for one of the load wheels to lose contact with the test platform and it is acceptable for parts of t
8、he structure or other designed features to make contact with the test platform. 4.2.2 Fixed slope Fixed slopes, with inclinations equivalent to the prescribed test slope, shall be used. The slope surface shall be smooth and capable of supporting the truck mass with no deformation likely to affect th
9、e test results. The truck under test shall be driven onto the fixed slopes with mast lowered and positioned according to table 3. For each of the laden truck positions, the load shall be elevated slowly and smoothly to the height indicated in table 3. 4.2.3 Calculation Compliance with the specified
10、values may be determined by calculation. Such calculated capacities shall take into account manufactur- ing variations and deflections of mast, tyres, etc. 4.3 Test conditions 4.3.1 Condition of truck The tests shall be carried out on an operational truck. The operator on rider-controlled trucks sha
11、ll be simulated by an object having a mass of 90 kg if the stability during a test is thereby decreased. For a truck designed for operation with a standing operator, an object having a mass of 90 kg shall be secured with its centre of gravity 1 000 mm above the floor of the operator s platform at th
12、e centre of the position normally occupied by the operator. For a truck designed for operation with a seated operator, the centre of gravity of the object shall be secured 150 mm above the seat index point (SIP) as deter- mined in accordance with IS0 5353, with the seat at the mid- point of the adju
13、stments provided. Fuel tanks of internal combustion engine trucks shall be full if stability is thereby decreased. All other tanks shall be filled to their correct operating levels, as applicable. Tyres shall be in- flated to the pressure specified by the truck manufacturer. 4.3.2 Position of truck
14、on platform For tests Nos. 1 and 2 (see table 31, the truck shall be placed on the test platform so that the load axle is parallel to the tilt axis, XY, of the test platform (see figure 9). For tests Nos. 3 and 4, the truck shall be placed on the test plat- form in a turning position with line MN pa
15、rallel to the tilt axis, XY of the test platform. In figures 10, 11 and 12, the steer wheel nearest to the tilt axis shall be parallel with it. Lateral stability tests shall be conducted to the side of the truck which is the less stable. Point N is the centrepoint of the area of contact between the
16、test platform surface and the front wheel nearest the tilting axis (see figures 10, 11 and 12). Point M is defined as follows: a) for trucks having an articulated steering axle: the pro- jection on the test platform of the intersection of the longitudinal centre-plane AB of the truck with the axis o
17、f this axle (see figure 10); b) for trucks steered by a single swivelling wheel: the centrepoint of the tread contact area between the steer wheel and the test platform surface (see figure 11); c) for trucks steered by twin swivelling wheels: the centre- point of the tread contact area between the s
18、teer wheel nearer to the axis of tilt XY, and the test platform surface (see figure 12); d) for trucks having steer wheels not connected by a common axle, but which are arranged to articulate approxi- mately about the longitudinal centre-plane of the truck, the projection on the test platform of the
19、 intersection of the longitudinal centre-plane of the truck, AB, with a line CD (see figure IO) connecting the vertical turning axes of the steer wheels. 4.3.3 Test load The test load shall have a mass equivalent to the maximum load, Q, which the truck can elevate to its maximum lift height acting t
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