Plastic Piping Series,CPVC Tees,UPVC Tees Galaxy Valve Co., Ltd. , http://www.tjgalaxyvalve.com
After the single reducer gear is turned over, because the helical gear has an angle B, each gear has an outward axial force. Whether this axial force can change the meshing condition of the gear along the axial moving surface must be determined by calculation. . From the gear structure, the low-speed gears Z3 and Z4 are all in the normal body structure. Although there is axial force, they will not move. Only the high-speed gear Z2 may be exchanged along the axial gear, and the high-speed gear Z2 Whether or not to prevent axial movement is required, the axial force of Z2 must be verified. Calculation of axial force of gear Z2, calculation of torque output of motor M=97500Nn where N, motor power (kW), N=250kW; n, motor revolutions, r/min, n=320r/min. However, the design speed is 3201000r/min. From the motor torque calculation formula, it can be seen that the lower the output torque, the larger the output torque is. For the sake of safety, n is selected to be 320r/min.
Each gear is subjected to a torque of M1=M2=761722=3730Nm, M is the motor torque; the high-speed gear is two gears. The circumferential force acting on the radius of each gear pitch circle is P1=M1/r1=38066/811=46060N, P1 in the formula, the torque per gear, N; r1, the pitch radius of the gear, r1=Mn@(Z1/ 2) @cosB=811cm. The axial force generated by each high-speed shaft gear is Pd=P1tanB where B is, the gear helix angle is 21b20c29d. Pd=4700@0138968=17963N3 High-speed shaft and gear can withstand the axial force The high-speed shaft and the gear Z2 hole (<300D/jf) are interference fit, according to the part drawing: (1) Axis <300 0113501100, the material of the shaft is 50SiMnMoV with a surface finish of y6 (2) drum: drum diameter is <300 0105 drum outer diameter is <480 material is HT20HT40, with the finish of y6311, the minimum interference of the mating surface is calculated. The calculation method is smaller than the actual interference amount Dmin, which is Dmin=Dcmin 112 (RZ1 RZ2) where Dcmin, the minimum fit interference; RZ1, the surface roughness of the shaft; RZ2, the surface irregularity of the hole; Dmin, the minimum actual Interference.
Find RZ1=RZ2=10Lm take the minimum diameter of the shaft<300 01100 Take the large amount of holes: <300 0105Dcimn=50Lm Substitute formula is Dmin=50 112(10 10)=74Lm The calculation of the surface pressure strength when the shaft is matched with the hole is Pc=Dmind(c1/E1 C2/E2)@104 where d is the nominal diameter of the surface; E1, the elastic modulus of the shaft material E1=211@106; E2, the elastic modulus of the drum material E2=112@106 ; C1, C2, coefficient, C1=0172, C2=21532.Pc=7430@(0172/211@106 21532/112@106)@104=100168kg/cm2=9.9MPa Calculate the surface energy of the shaft and hole according to the following formula The axial force assumed is P=PcfPdL(kg) in the formula Pc, the surface pressure strength; f, the friction coefficient of the mating surface, f=011; d, the nominal diameter of the mating surface, d=30cm; l, the mating surface width cm , l=B=16cm. Substitute the formula P=100168@011@3114@30@16=148710N4 The comparison of the axial force of the high-speed shaft and the hole can be compared with the axial force generated by the gear. Condition: p>pa, that is, the axial force p that the mating surface is subjected to must be greater than the axial force pa generated by the gear. By calculating P=148710Npa=17865Npc-pa=130845N and the reliability coefficient is p/pa=148710/17865=8132, it is concluded that after the two boxes of steel belt gear 1 are exchanged, the axial force generated by the gear is much smaller than the axis assumed by the mating surface. No need to take any action. The gear can be changed and used.
The economic benefit of using the gear to change the box, the steel belt machine gear has not replaced any parts, saving the processing of the parts and shortening the production stoppage time. Saving 1097768 bearings 8 sets, 2097144 bearings 8 sets, 2330 bearings 8 sets, combined with RMB 3.12 million. Save transportation costs of 10.13 million yuan. Since the gear of the steel belt reducer on October 1st, 1992, it has been safely operated for 27 months in January 1995. It transported 3 million tons of raw coal and concurrently transported personnel to ensure the normal production of our mine. We believe that the gear of the unidirectional working reducer is implemented under the condition that the gear strength meets the requirements after the working tooth surface wears. It can be used according to the above method. The process is simple, saves time and money, and sets a gear set with two sets of gears and decelerates. The gear life of the device is doubled.