Recently, the China Machinery Industry Federation organized experts in Wafangdian to evaluate 9 scientific and technological achievements, including the "Key Technology Research and Application of Low Temperature Heavy duty Railway Freight Car Bearings" project of ZWZ Group. The appraisal committee unanimously believes that these 9 projects are technologically advanced and have independent intellectual property rights, and agrees to pass the appraisal.

    The appraisal committee, through project reporting, review of relevant technical materials, and on-site inspection, after questioning and discussion, believes that the overall technology of the "Key Technology Research and Application of Low Temperature Heavy Load Railway Freight Car Bearings" project, "Research and Application of Suspension Bearings for Passenger Car Shock Absorption Systems" project, "Research and Application of High Temperature Resistant Conical Roller Bearings" project, and "Research and Application of Transmission System Segmented Bearing Units for Marine Transportation Equipment" project of ZWZ Group has reached the international advanced level; The overall technology of the projects "Research and Application of Adjustable Roller Bearings for Extra Large High Pressure Roller Grinding", "Research and Application of Planetary Wheel Bearings for Wind Power Gearboxes", and "Research and Application of Planetary Transmission Bearings for Large Mining Truck Wheel Hub Drive" has reached the leading level in China; The overall technology of the "Research and Development of Double row Cylindrical Roller Bearings for Independent Spindle of High speed and Long life Machine Tools" project and the "Research and Application of Platform based Full load Cylindrical Roller Bearings for High load and Long life Wind Power Drives" project has reached the advanced level in China.

    The project "Research and Application of Key Technologies for Low Temperature Heavy Load Railway Freight Car Bearings" has developed double row tapered roller bearings for low-temperature heavy load railway freight cars. A compact unit structure, overall light contact, and low temperature deformation sealing device have been designed to improve the service life of the bearings. Based on the characteristics of low-temperature working conditions, low-temperature selection tests of lubricating grease, retaining frame, and sealing rubber materials have been conducted to ensure the application performance of bearing parts in low-temperature environments; The project of "Research and Application of Suspension Bearings for Passenger Car Shock Absorber Systems" has designed a suspension bearing consisting of a metal thrust bearing and an outer plastic shell. The outer cover and base are connected by a "reverse snap" structure, ensuring the assembly and pull-out force of the suspension bearing during operation. In addition, a metal support ring is designed outside the suspension bearing base, effectively reducing its deformation when subjected to the concentrated force of the coil spring at a single point, ensuring the rotation accuracy of the suspension bearing, and meeting the steering requirements; The project "Research and Application of High Temperature Resistant Conical Roller Bearings" studied the effects of friction torque, dynamic load, etc. on the performance and service life of high-temperature conical roller bearings, and optimized the structure and parameters to extend the service life of the bearings; The project of "Development and Application of Transmission System Split Bearing Unit for Marine Transportation Equipment" has invented an adjustable cylindrical roller split bearing unit and axial floating structure. The bearing seat of the cylindrical roller bearing is an inner spherical surface and the bearing box is an outer spherical surface structure, which can achieve the function of adjusting the center at a certain angle in any direction, solving the problems of deflection, centering and processing errors in long and straight shafts, and facilitating disassembly and assembly.

    The bearings of these 9 projects of ZWZ Group have been installed and applied by multiple customers, and it has been shown that they operate reliably, have good effects, meet the requirements of use, and have significant economic and social benefits