We supply butterfly valves of carbon steel and stainless steel, pneumatic, electric or hydraulic as drive method, central, single, double or triple seal structure, low, medium, high and ultra high operation temperature. According to connection types, there are wafer type butterfly valve, ear type butterfly valve, flange type and weld type butterfly valves. In terms of sealing, we have force sealing butterfly valve, pressure sealing butterfly valve, automatic sealing butterfly valve. Soft sealing and metal hard sealing.
Butterfly Valve Price,Butterfly Check Valve,Pneumatic Butterfly Valve,Stainless Steel Butterfly Valve Botou Ever Lucky Environmental Protection Machinery Co., LTD , https://www.dustcontrolling.com
Reason Analysis The locomotive commutation is to move the reversing handle to the forward or reverse position with the main controller zero position and the standby car is stopped. Then raise the main handle to advance or retreat the locomotive. When the reversing electric control valve is energized, the control wind first passes through the reversing restriction valve on the hydraulic transmission box, and then to the Zhou Yanxue, the operating air cylinder pushes the operating mechanism to make the Z24 and Z32 or Z34 mesh to complete the reversing. When the tooth tip condition occurs, the microcharger must be activated to switch direction. If the reversing control mechanism adjusts the tolerance or the eccentric wear of the cast copper block, the Z24 and Z32 or Z34 cannot mesh, so that the clutch is in an abnormally restrained state; if the reverse interlock circuit is disabled or the driver misuses, the diesel engine is started. The blast speed is generated between the pump impeller and the turbine. Will cause the Z24 to be toothed with Z32 or Z34. Mistakenly mentioning the position of the main hand to the torque converter can increase the degree of toothing. For these factors that cause the locomotive to commutate, we can eliminate the assembly parts to the driver's operation and change the structure.
Objectively, most of the factory repairs of Dongfanghong 3 and Dongfanghong 5 locomotives have exceeded the second factory repair period, and the transmission parts are damaged more seriously. The commutation of the locomotive is completed by the internal gear of the reversing gear meshing with the external teeth of the toothed clutch. The inner and outer tooth shapes are displacement gears and have 15 self-locking angles. The technical requirements are HRC5863, round head carburizing layer 115. Tooth clutch material 20Cr, section frame repair and factory repair are required to be replaced. The reversing gear material is 20CrMnTi, and the Z32 and Z34 teeth of the external helical gear Mn7 are basically in good condition, and the internal tooth damage is difficult to overhaul. The factory repair should be repaired and used, otherwise it will leave hidden dangers for the use of the locomotive.
The actual condition of the factory repair locomotive is that the internal gear round head of the reversing gear has different degrees of damage, and some carburized layers have been worn away. Most of the reversing gears that are available for inspection have R3 and R5 corresponding to the inner tooth ends, and the collision wear shapes are different. The use of loading can give the locomotive commutation more chances of tooth tips. Locomotive reversing operations are frequent, and the internal gears of the reversing gear and the external teeth of the toothed clutch collide with each other frequently. The reversing gear whose end is worn and which forms a sharp edge engages with the new toothed clutch, which also exacerbates the damage of the inner and outer tooth ends. Even in the normal tooth top tooth condition, the driver presses the micro-charge button several times to start the micro-charger action, and the locomotive can not be normally reversed, resulting in a faulty commutation fault of the Z32 and Z24 round heads. Therefore, it is necessary to study the inspection standard and repair process of the internal gear end of the reversing gear to ensure the reversing performance of the locomotive.
Calibration internal gear internal tooth parameters: m = 6, Z = 24, = 20, = 30, ha = 05, hc = 09, R3 = 3. The internal gear of the reversing gear is as shown. The internal gear of the reversing gear can be obtained: P/2=m/2=3, ha=mha=3, b=hatg=3tg20, H=P/2-2b=724. Thus the following relation is derived: L= 2{(R3-X)tg [R3-(R3-X)/cos]/sin} where L is the wear plane width of the inner end of the reversing gear, and X is the wear length of the inner end of the reversing gear. Corresponding calculation results are listed.
The wear flat width and wear length of the internal gear end of the reversing gear can be seen from the above analysis: when X < 372, that is, L < 724, the meshing area of ​​the internal gear of the reversing gear and the external teeth of the toothed clutch is not reduced. We used a portable hardness tester to randomly sample the HRC hardness of the internal end of the eight-piece reversing gear as listed. The average value of the HRC hardness L (mm) 123 of the inner end of the reversing gear was identified, and the hardness of 5 pieces of L = 2071 mm met the requirements. However, at the end of L5mm, the inner tooth end has a large flat surface and has no value for repair. It is determined through discussion that the wear surface width L<5mm of the internal gear end of the reversing gear can be repaired and utilized (the wear length of the inner end of the reversing gear is not more than 1mm).
Test our special RDJ-77 and CM891 professional milling machines, and check 10 reversing gears according to the standard. The end of the inner tooth is cleaned by sharp edges and edges, the milling is smooth, and the flaw detection cleaning process is complete. It is assembled in the hydraulic transmission box, and after being tested by the bench, it is installed on 7 Dongfanghong 5 locomotives. Its tracking assessment records are listed.
Conclusion The 10 reversing gears tested on 7 sets of Dongfanghong 5 locomotives operate normally during the inspection period, ensuring the commutation performance of the locomotive. Through the analysis and test of the gear change of the Dongfanghong 5 locomotive reversing gear, the problem of commutation and toothing of the hydraulic transmission diesel locomotive is solved. At present, we have over 262 Dongfanghong 3 locomotives and Dongfanghong 2, Dongfanghong 5 and GK locomotives. According to the above test conclusions, more than 500 pieces have been repaired for the internal tooth end of the locomotive reversing gear, which not only reduces the maintenance cost, but also makes the locomotive reversing smoothly, thus ensuring the reliability of the locomotive operation.
