When the ball bearing center of rotation coincides with the center of rotation of the upper structure, only between the ball and the spherical cap liner PTFE plate needs to happen slide, you can make the seat to rotate. But when the ball bearing and the center of rotation of the upper structure of the two do not coincide unidirectional sliding steel ball bearing, rotating bearing beam must be bound, in which case it must be on the stand with PTFE plate between, providing a second sliding surface. According to the relative position of the center of rotation of the upper structure and the spherical rotational direction may coincide with the plane opposite to the sliding direction of the living. If the two coincide with the center of rotation, the slide does not occur on a plane. Ball bearing rotational torque size and spherical and flat m friction related. Thus, the ball bearing rotation eccentricity and bearing friction coefficient μ and the spherical radius R related. According to the German measured data from the rotation of the eccentric bearing for e = μ.R. This value is less than the theoretical value of the static analysis, this is because the rotation occurs when the grid bearing steel ball bearing manufacturers slip-way, one-way corridor does not appear static friction and sliding the ball in a spherical plane while two sliding surfaces steel bearing manufacturers, first place in the rotation bearing spherical PTFE plate, and then it occurred to rotate in a plane tetrafluoride board. It should be noted here, the European standard EN1337-7 design is based on the failure limit state, the role of the load should be multiplied by the corresponding load factor, considering the dead load and live load, the load factor is about 1.35 to 1.54 of Quality, And resistance skateboard material should also be sub-divided by the material factor. Taken damage limit state design strength, much larger than the allowable stress design of press material strength values, so the design does not consider the impact of the sliding surfaces eccentric moments, without regard to skateboard bearing area reduction, directly by the vertical load of the average stress steel ball bearing steel slip-way finished, were taken in the design strength of the material should be 30MPa and 45MPa, to determine the skateboard area is somewhat safe and feasible. Currently in the domestic ball bearing Single Support continuous curved plate structure, single column supported continuous curved box girder structure, continuous support of T-post and beam structure large span cable-stayed widely used overseas. Shanghai Yangpu Bridge positive step onto the bridge with a four-way activity 15MN ball bearing, due to the positive bridge length 1178m, 1088m long bridge between the two ends of the movable carriage, due to temperature, live load and wind load and other factors at the maximum design displacement stand up to +850 and -650mm. Specially made ball bearings large displacement type PTFE wear I can experiment with vinyl sheets. After 13 group (26) block PTFE plate in grease lubrication wear long-distance performance simulation (for example wear specimens up 2KM) show large displacement ball bearings must be molded PTFE plate , the molding pressure of not less than 30MPa. PTFE plate wear liquid molding process will grease pit cracking along the reservoir, and thus should not be used. Unidirectional sliding steel ball bearings, shock damping steel unidirectional sliding ball bearings, ball bearing damping provided by Hengshui Rubber Co. Guangrun. Hengshui Guangrun Engineering Rubber Co. (www.grgcxj.cn) is specialized in the "seismic steel ball bearings, spherical steel unidirectional bidirectional slide bearing, fixed-elastic damping ball bearing hinge" of the enterprise, the company is adhering to the "integrity management , hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr. Wang.