Plastic Injection Clear Housing
The transparency of the plastic injection transparent shell matrix resin itself has a great influence on the transparency of PP plastic products. In order to improve PP transparency, a small amount of polyacrylate resin with good transparency and compatibility can be added.
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Calculate the torque T1 on the drive large gear, the torque T on the high speed gear is high, the low speed gear torque T is low T1=9.55×106P/n1NmmP—motor power P=1306kWn1—large gear speed (motor speed) n1=2970r/ Min so T1=9.55×106×1306/2970=4.199×106NmmT high=T1u1u1―High speed speed ratio u1=Z high/Z=34/300=0.113T high=4.199×106×0.113=4.744×105NmmT low=T1u2u2 ―low speed speed ratio u2=Z low/Z=44/300=0.147T low=4.199×106×0.147=6.173×105Nmm4.2 Tooth surface contact strength Calculate the tooth surface contact strength formula of a pair of steel standard gear transmissions, That is, δH ≤ [δH] δH - the maximum contact stress of the gear surface MPa [δH] - the contact stress of the surface contact MPa4.2.1 the driving gear contact stress [δH] = 355 (u + 1) 3KT1uba2 "MPa type: u - transmission ratio (increased Speed ​​ratio) u=Z1/Z=34/300=0.113K—loading factor K=1.5b—tooth width b=50mma—center moment a=590mmT1=4.199×106NmmδH=335(0.113+1)2×1.5×4.199× 1060.113×50×5902"=3358.68×1061966765"=703.5MPa[δH]=δHlim/δHMPaδHlim——contact fatigue limit of gears Check the table calculation = 1350MPa δH - gear contact fatigue safety factor, look up the table to calculate: 1.3 [δH] = 1350 / 1.3 = 1038.46MPa so δH = 703.93MPa < [δH] safety 4.2.2 high-speed gear contact stress δH = 355 ( U1+1)3KT high u1ba2"T high=4.744×105Nmmu1=0.113K=1.5b=50mma=590mmδH=355(0.113+1)2×1.5×4.744×1050.113×50×5902â€=355981118.4271966765â€=236.6MPa so δH=236.6 MPa<[δH] safety 4.2.3 low-speed gear contact stress δH=355(u2+1)3KT bottom u2ba2"T bottom=6.173×105N
Mmu2=0.147K=1.5b=50mma=218mmδH=355(0.147+1)3×1.5×6.173×1050.147×50×2182â€=3551397261.812349301.4â€=670MPa[δH]=δHlim/δH=1350/1.3=1038MPaδH= 670MPa<[δH] Safety 4.3 Calculation of gear bending strength by: Formula for calculating the bending strength of gear teeth δF ≤ [δF] MPa In the formula: δF - Maximum bending stress of the tooth surface MPa [δF] - Allowable bending stress of the tooth surface MPa4.3.1 Drive large gear bending stress δF=1.6kT1YFcosβ/bm2Z In the formula: K-load factor K=1.5 (table calculation) T1—large gear torque (motor output torque) YF=tooth shape coefficient YF large=2.15 (check Table calculation) β-helix angle β=8°cosβ=0.990b—tooth width 50mmm—modulus m=3.5Z—tooth number Z large=300Z high=34Z low=44δF=1.6×1.5×4.199×106×2.15×0.990 /50×(3.5)2×300=21450171.6/183750=116.74MPa[δF]=δFlim/δFδFlim—tooth root bending fatigue limit δFlim=360MPa (table calculation) δF—tooth bending fatigue safety factor δF=1.6 (check Table calculation) [δF]=360/1.6=225MPa so δF=116.74<[δF] safety 4.3.2 high
mmYF high=2.53cosβ=0.990Zhigh=34δF=1.6×1.5×4.744×105×2.53×0.990/50×(3.5)2×34=136.94MPa[δF]=225MPa so δF=136.94MPa<[δF] safety 4.3.3 Low-speed gear bending stress δF=1.6KT low YF3cosβ/bm2Z2T low=6.173×105N
mmZ low=44YF low=2.41δF=1.6×1.5×6.173×105×2.41×0.990/50×(3.5)2×44=3534758.57/26950=131.2MPa[δF]=225MPa so δF=132.2MPa<[δF] Safety 5 Conclusion Through the above analysis and analysis of the 810DA3 centrifugal air compressor speed increase and gear tooth surface contact strength and gear bending strength, 8 sets of 810DA3 centrifugal air compressor speed increase gears can meet the contact strength and bending strength. Claim. Since the operation of the air compressor for 2 years, this calculation conclusion provides a scientific basis for the inspection, analysis and processing of air compressor vibration, noise and overheating sources.
Air compressor speed increase gear box strength check and verification Tianjin Iron and Steel Company exported 12,300 tons of steel in July. In July, Tianjin Iron and Steel Company’s Foreign Economic and Trade Office seriously implemented the company’s production and operation work, and the prices in the domestic and international steel market continued to fluctuate. Under the circumstances, we adhered to the principle of maximizing the interests of the company, actively responded to market challenges, focused on various tasks, and strived to expand profit margins. We exported a total of 12,300 tons of high-line and bar stocks and earned US$4.9983 million.
(1) the inorganic nucleating agent mainly consists of ultra-fine talc powder and SiO2, and also includes calcium carbonate, mica powder, inorganic pigments and fillers, etc., which is cheap in price and rich in source, but has certain influence on the gloss and transparency of the products.
(2) organic nucleating agent organic nucleating agent is a kind of organics with low relative molecular weight, represented by sorbitol and its derivatives. It has good compatibility with matrix resin and can significantly improve product transparency and surface gloss.
(3) in the case of sorbitol, when the amount of nucleating agent exceeds 0.3%, the effect of transparency improvement is not obvious, and even decreases. However, when the dosage is less than 0.2%, the nucleation quantity is insufficient and the transparency is not increased enough. It can be seen that the amount of nucleating agent should be between 0.2-0.3%. Therefore, suitable nucleating agent content can better improve the transparency of PP.