Luoyang Yujie Industry&Trade Co., Ltd is one of the most experienced manufacturers and suppliers of forged rotary kiln large girth gear in China. Please feel free to buy cheap forged rotary kiln large girth gear for sale here from our factory. All customized products are with high quality and competitive price.
rotary kiln large girth gear supplier
A rotary kiln large girth gear is an essential component of a rotary kiln. It is a large, circular gear that is mounted on the shell of the rotary kiln and meshes with a pinion gear to transmit torque from the motor to the kiln. The girth gear ring is typically made of steel and is heavily machined to ensure a precise fit and maximum strength.The large girth gear plays a critical role in the operation of a rotary kiln, as it must be able to withstand the high stresses and temperatures associated with the kiln's operation. It is also subject to wear and tear over time, due to the constant rotation and thermal expansion and contraction of the kiln.
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custom parameters to choose
| Parameter | Standard Selection Range |
| Module (M) | 20 ~ 50 mm |
| Gear ring teeth | 100 ~ 220 |
| Face width | 200 ~ 800 mm |
| Pitch diameter | Φ2000 ~ Φ14000 mm |
| Tooth form / Pressure angle | Involute spur gear; α = 20° |
| Material | ZG35CrMo, ZG42CrMo (mainstream); ZG35SiMn (economy grade) |
| Heat treatment & Hardness | Quenched & tempered, HB240 ~ 300 |
| Gear accuracy grade | GB/T10095 / ISO1328: Grade 8 ~ 10 |
| Structure type | Split cast steel gear ring; spring plate / pin connection |
| NDT | UT (ultrasonic) + MT (magnetic particle) at tooth root and critical flange areas |
processing
For the machining of large rotary kiln girth gears, we primarily rely on comprehensive specifications provided by the client-including drawings, material grades, geometric tolerances, and hardness requirements. We select appropriate CNC machine tools based on the specific dimensions and weight of the gear ring, utilizing equipment such as large vertical lathes, gantry milling machines, and floor-type boring machines. Detailed inspection reports and photographs are provided to the client for each stage of the machining process, and third-party inspections can also be arranged.
applications
●Ball Mills: The girth gear is used to drive the ball mill cylinder, which contains grinding media, to grind the material.
●Rod Mills: The girth gear is used to drive the rod mill cylinder, which contains grinding media, to grind the material.
●Sag Mills: The girth gear is used to drive the sag mill cylinder, which contains grinding media, to grind the material.
●Sugar Mills: The girth gear is used to drive the rollers in the sugar mill, which crushes the sugar cane to extract juice.
●Cement Plants: The girth gear is used in cement plants to drive the rotary kiln and ball mill.
●Mining: The girth gear is used in mining equipment, such as hoists and shovels, to transmit torque.
●Power Plants: The girth gear is used in power plants to drive the turbines and generators.
Testing
•QA DOC: Chemical Composition Report, Mechanical Properties Report, UT Report, Heat Treatment Report, Dimensions Check Report
•The data on chemical composition report and mechanical properties report are approved by third party, Luoyang Ship Material Research
Institute, CSIC.
•UT test: 100% ultrasonic test according to EN10228-3, SA388, Sep 1921 C/c etc.
•Heat Treatment Report: provide original copy of heat treatment curve/time table.
FAQ
Q: Are your girth gears outsourced or manufactured in-house? A: All girth gears are independently manufactured by our factory. We have complete sets of equipment for hobbing, gear shaping, heat treatment and gear grinding. Core gear profile processes including blanking, rough & finish machining are fully controlled internally without outsourcing.
Q: How do you control deformation for large-size / thin-walled girth gears? A: With years of girth gear manufacturing experience, we adopt multi-stage machining plus stress relief between processes. Custom tooling and fixtures are applied. Our machine tools can steadily control clamping stress to reduce deformation from heat treatment and finishing, meeting your tolerance requirements.
Q: What equipment do you use for girth gear inspection? Is the inspection equipment owned by your factory? A: We are equipped with our own gear measuring center, hardness tester, roundness gauge and other full-range inspection devices. Each batch will be sampled or fully inspected on key parameters such as tooth profile, tooth lead, total pitch deviation and span measurement. Complete inspection reports are kept on file.
Q: Will the accuracy of girth gears drop significantly after heat treatment? How do you handle it? A: We reserve proper finish machining allowance according to material and module. Post heat treatment, gear grinding is arranged to release residual stress and correct tooth profile & tooth lead deviations caused by heat treatment.
Q: What quality documents can you provide upon delivery? A: Material certificates, heat treatment reports, gear inspection reports and dimensional records are available. NDT reports can be supplied on request for critical parts, with full traceability.
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