As a two-stage suspension for locomotives, metal laminated springs have been widely used in the world. They can not only attenuate the high-frequency vibration transmitted from the wheels, but also achieve different stiffness values ​​in different directions, such as left and right and front and rear. It satisfies the deflection and recovery between the car body and the bogie, and improves the force state when the locomotive passes the curve. The rubber metal laminated spring is used on the locomotive and the like, and has achieved good results. It is a structural schematic diagram of the rubber metal laminated spring, which is formed by vulcanization of the upper and lower end plates, the partition plate and the rubber. As one of the vehicle body supporting devices, the rubber metal laminated spring is installed between the bogie and the vehicle body, the lower end surface is located on the bogie, and the upper end surface carries the vehicle body, and the mass of the vehicle body is elastically and evenly distributed in the steering. On the frame of the frame. When the locomotive passes the curve, it can generate corresponding displacement between the car body and the bogie, so that the locomotive can smoothly pass the curve. When the locomotive passes the curve, it can restore the original balance between the bogie and the car body. And through it to pass a variety of additional forces. The stress of the laminated spring is more complicated. The vibration generated between the wheel and the rail, the vibration generated by the locomotive itself, the longitudinal impact of the locomotive acceleration and braking, and the lateral deflection when the locomotive passes the curve will be the anchor section of the rubber metal stack 318. Insulated anchor joints are provided at both ends of the joint new station, and the sections are non-insulated joints except for the relevant sections.
The turnout positioning method of the new Qinshen Passenger Dedicated Line section of the turnout is temporarily based on the crossover positioning method of the German Re200. The turnout model is the No. 38 speed-increasing turnout. There is no harmful space in the turnout, which is more conducive to the passage of high-speed trains.
Prospects Qinshen Passenger Dedicated Line is a landmark project for cross-century railway construction after China introduced the Re200 technology from Guangzhou to Shenzhen quasi-high-speed railway and Harbin to Dalian. No matter from design or construction, the electrified railway design speed is up to 300km/h. The first use of magnesium-copper alloy contact wire, the first use of the anti-corrosion performance of the font and font diameter steel column, the lower part of the contact net The foundation shall be constructed by the subgrade construction unit along with the roadbed construction, and the contact wire shall be erected with rated tension. It is believed that through the construction of the Qinshen Passenger Dedicated Line, especially the comprehensive test section, a road to electrification construction that promotes the combination of high technology and engineering will be explored, and a dual reserve of technology and talents will be made for the high-speed electrified railway. The layer springs have an influence, and these stress factors are comprehensively considered. The most important one is the dynamic compression fatigue of the laminated spring, which is the main cause of the failure of the laminated spring. We mainly studied the improvement of the fatigue resistance of the rubber. . The ordinary vulcanization system and the semi-effective vulcanization system have better flex crack resistance, but the fatigue heat generation is larger, the fatigue residual deformation and compression set are higher, and the stress relaxation coefficient is lower. The peroxide vulcanization system and peroxygen are effectively combined with the vulcanization system to form a crosslinked network mainly composed of single bond and monosulfide bond, which has the characteristics of low heat generation, small fatigue residual deformation, small compression set and high stress relaxation coefficient. Resistance to flex cracking is not good. The crosslinked network formed by the effective vulcanization system and the sulfur carrier vulcanization system is not particularly outstanding in performance, and the stress relaxation coefficient is low. Comprehensive evaluation, preliminary selection of peroxygen) effective use of the vulcanization system. The choice of different reinforcing systems lists the effects of several different carbon blacks on the properties of the rubber compound. It can be seen from the table that the three high-structure carbon blacks with high wear resistance, gas mixing and super wear resistance have superior reinforcing performance. However, the heat generation is too high, and the rubber has poor resilience and high compression set. Semi-reinforcing, spray, general-purpose three carbon blacks with low heat generation, low impact elasticity, especially semi-reinforcing carbon black, the best comprehensive performance, selected semi-reinforcing carbon black and spray carbon black as reinforcement Agent.
Conclusion The peroxide vulcanization system is combined with the effective vulcanization system. The addition of semi-reinforcing carbon black and spray carbon black can make the rubber compound have better comprehensive performance and outstanding fatigue characteristics, which can make the rubber) metal laminated spring have a good Compressive heat generation performance. In addition to the shape of the product itself, the hardness of the compound and the thermal history of the process have a direct impact on the static stiffness of the product. For thick products like laminated springs, it is advisable to use low temperature and long time vulcanization. The time directly affects the dynamic performance of the product. The vulcanization time of the laminated springs for SS3 and SS4 locomotives can be determined to be 120 min. The compression fatigue heat generation performance of rubber It directly affects the service life of the product. On the basis of ensuring other properties of the rubber compound, the fatigue temperature rise of the rubber is as small as possible.
It take a compressed gas as the power to form a high-speed jet to shoot glass beads on surface of work-piece that causes changes on surface and shape of the work-piece. Due to the glass beads` impact to surface, it makes the surface a certain of cleanliness and different roughness.
• It improves the mechanical properties of surface so as to enhance the fatigue-resistance of work-piece.
• It provides with parts-surface a controllable rough-surface to increase the adhesion with the paints, to extend the durability of the paints and it is also benefit to the flow and decoration of paints.
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
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