General test method and industry standard of caster.
1. Impact test
Any items for transport, use, preservation conditions will impact vibration may be produced but the product such as adverse even cannot be used in a certain period of time, type furniture with its big, weight and other characteristics are often vulnerable to the impact, and at the bottom to determine whether furniture placed smooth castor is more should have good impact resistance. European truckle test standard of shock test method is: will castor vertical backward installed on the ground test platform, the quality is 5 kg (+ / - 2%) of the weight from the height is 200 mm, the allowable deviation plus or minus 3 mm, the position of the free fall impact castor wheel edge, if for two rounds of two wheel should be hit at the same time. No part of the caster is allowed to separate during the whole experiment. In addition, after the experiment, the roller should be rolled, and the rotation or brake function should not be damaged.
2. Resistance performance test.
When testing the performance castor should keep dry and clean, place the caster in a piece of insulation on the metal plate with the ground, keep the wheel edge in contact with the metal plate, on the caster wheel load of 5% to 10% of the nominal load. The electrical resistance value between the caster and the metal plate is measured by the insulation resistance tester (the nominal open-circuit voltage is 500V, the measured resistance fluctuation is within 10% and the loss of the product is no more than 3W). For the conductive casters, the resistance value is not greater than 104 ohms, while the resistance of the anti-static casters should be between 105 and 107.
3. Static load test.
The caster should always run steadily on the ground, but that is almost a purely theoretical state. On uneven surfaces, or on the threshold, track and pit, the caster will briefly leave the ground. So when they are suddenly overloaded or when three of the four wheels touch the ground, they must load the entire furniture. European standard casters in static load test process is to casters in horizontal smooth steel with screws testing platform, applying force of 800 n along the gravity direction of castor keep 24 h, will force excluding check castor status after 24 hours, after the experiment measured the deformation of castor does not exceed 3% of the wheel diameter, and the experiment after the completion of the caster roll, circuition or brake function has no damage is qualified.
4. Reciprocating wear test.
Castor as the mainstay of furniture to move to and fro, wear aging is inevitable, the length of the reciprocating wear life directly affect the normal use of furniture products, there may be some once after blow-down will not easily move heavy furniture, but the swivel chair casters most frequently used but have to accept the test of rolling back and forth all day long. Castor reciprocating wear test to simulate the casters in daily use of the actual rolling, the two points with and without obstacles obstacles test test, the trundle put to the test platform is installed correctly, each test caster wheel load of 300 n, test frequency for six to eight times/min, a test cycle includes forward 1 m and 1 m back to reverse a movement back and forth, with an obstacle in high (metal barrier, 50 mm wide, 2 mm - 3 mm) on the test platform of testing 5000 (H castor) or 30000 (W casters). There are 70,000 (H casters) or 20,000 (W casters) on the unobstructed horizontal test bench. In the process of test is not allowed to have from castor or other part, at the end of the test each castor should be able to drive its normal function, test after the completion of the caster roll, circuition or brake function should not be damaged.
5. Rolling resistance and rotation resistance measurement.
When castor mobile or to control the driving direction, power must be on the object to the caster and to overcome certain resistance, resistance depends on the size of the: weight, wheel diameter, material, round face shape, castor rotating field. Tests on the rolling resistance, in the standard are three casters will be installed in a three arm of the base, according to the different levels of tests, the 300/600/900 n load test (including the quality of the base) applied to the base, put a horizontal traction made the caster wheel speeds on the test platform of 50 mm/S (deviation plus or minus 5% allowed), 10 S. Due to the large friction force and an acceleration due to the starting time of the caster, the measurement of the traction force after 5S is not more than 15% of the test load. Rotational resistance test is in linear or circular motion tester is installed on one or more casters, make its direction and driving direction to 90 °. Apply 100/200/300N test loads to each caster according to different test levels. Apply a horizontal traction force to make the caster on the test platform run at a speed of 50mm/S (allowable deviation plus or minus 5%) and rotate within 2S. Record the maximum level of traction that causes the caster to rotate, not exceeding 20% of the test load.
Caster Test Standard:
DIN EN 12527,ISO 22878:2004(en),EN 12532:1998
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