Castor test methods and requirements

1 impact test any goods transportation, 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 smooth at the bottom to determine whether furniture placed casters are more should have a good shock 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%） Heavy objects from 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. In the process of the whole experiment don't allow any part of the caster and separation. And experiment after the completion of the caster roll, circuition 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. With the insulation resistance tester ( Nominal open circuit voltage of 500 v, determination of the resistance value of fluctuation within 10% and no more than 3 w) in the wastage of the products The electric resistance between castor and metal plate. In type conductive castor, resistance is not more than 104, and the resistance of the antistatic caster should be between 105 and 107. 3. Static load test castor should always be steady running on the ground, but it is almost a state of pure theory. On the uneven surface, or in a threshold, orbit and potholes, castor will brief off the ground. So when they suddenly overloaded or four casters in three only contact with the ground, must carry the entire load of 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 testing castor as the mainstay of furniture to move to and fro, wear aging is inevitable, the length of the reciprocating wear life directly affects 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 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 castor load of 300 n, test frequency is ( 6 - 8) Times/min, a test cycle including 1 m and 1 m back to reverse a movement back and forth, with an obstacle in ( Metal obstacles, 50 mm wide, 2 mm - 3毫米) Test platform to test 5000 times ( H castor) Or 30000 times ( W type casters) 。 At the levels of no obstacle test bench (70000 times H castor) Or 20000 times ( W type casters) 。 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. Shanghai castor plant, universal wheel, casters, wanxiang castor 5. Rolling resistance and movement of castor or rotational resistance test to control the driving direction, the 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, caster wheel rotation of field. Tests on the rolling resistance, in the standard are three casters will be installed in a three arm of the base, according to different levels of tests, the 300/600/900 n load test ( Including the quality of the base) On the base of exerting a horizontal traction made the caster wheel speeds on the test platform of 50 mm/S ( Deviation plus or minus 5% allowed) , maintain 10 s. Due to the caster wheel rolling friction when starting, and there is a large acceleration test measurement after 5 s level of traction, the size does not exceed 15% of the test load for qualified. 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 °. According to the different levels of tests, each trundle on 100/200/300 n load test. Places a traction so that the test platform of caster wheel speed of 50 mm/S ( Deviation plus or minus 5% allowed) And the rotation happens within 2 s. To rotate the castor maximum level of traction, its size does not exceed 20% of the test load for qualified. Shanghai castor plant, universal wheel, casters, universal casters