Girth Gear for Rotary Kiln, Half Girth Gear, Ball Mill Half Girth Gear, Custom Large Girth Ring, Ring Gear Diameter 1m-8m Circumference & AMP

We are specialized in manufacturing different type of large mechanical products according to engineer drawings.

The products include gears, pinions, sprockets, shafts, wheels, rollers, couplings, pulleys, housings ,frames, molds, nonstandard machinery parts, wear resistant parts and structural components. Such as: drive shaft, Forging Hollow Shaft, Shaft Sleeve, Eccentric shaft, Forging rod, Large bolt, Heavy Duty Hydraulic Cylinder, are widely used in coiled material, petroleum, metallurgy, mine, machinery and transportation industry. etc.

Girth Gears: Rotary kiln Girth Gear,ball mill Girth Gear
Girth Gears offered find extensive application in different industry sectors including in sponge iron plants, steel & cement industry, mining industry, wind mills as well as in other industry sectors. These are made available in module range of 10 Module to 70 Module and in minimum diameters of 100 mm to 15000 mm. Further, these comprise maximum weight of 70 MT single pieces. Here the range of hardened & ground gear boxes/gears comprise Worm gear boxes, Helical / Double helical gears/gearboxes, Helical-Bevel gearboxes, Planetary Gearboxes and others.

ZTIC Gear Cutting Machines include:
Ø16m CNC Hobbing Machine
Ø12m Gear Cutting Machine (Switzerland)
Ø10m Hobbing Machine (Germany)
Ø4m CNC High Speed Hobbing Machine (Germany)
Ø1.6m Horizontal CHC Hobbing Machine (Germany)
Ø5m CNC Profile Gear Grinding Machine (Germany)
Ø2.8m CNC Profile Gear Grinding Machine (Germany)
Ø1.25m CNC Profile Gear Grinding Machine (Germany)
Ø1m CNC Profile Gear Grinding Machine (Germany)
Ø0.8m CNC Profile Gear Grinding Machine (Germany)
Automatic positioner
Module Range:  10 Module to 70 Module.
Diameter : Min 100 mm to16000 mm.
Weight : Max 120 MT single piece.
Hardened & Ground Gear Boxes/Gears:
Worm gear boxes
Helical / Double helical gears/gearboxes
Helical-Bevel gearboxes
Planetary Gearboxes
Hardened & Ground Helical- bevel gears & Spiral-bevels gears/gearboxes.
Rack & Pinions
Ratings:
Min 3 hp to  Max 1400 hp
Splash / Forced lubrication type
Send Enquiry
With more than 1000 girth gears sold over the world CITICIC Gear is a leading supplier in the cement and mineral industry. And as member of AGMA (American Gear Manufacturers Association), we do actively take part in defining the standard for gear rating calculations and service factors. 
We provide girth gears in three different designs
Fabricated steel
- forged ring
- rolled plate
Cast steel 
Ductile (Nodular) cast iron  
Fabricated gears became more common in the past and are constructed with forged steel gear rim materials and electro welded body structure. The rings are manufactured from a whole block of high resistance alloy steel. After the rough machining of the ring, we carry out hardening and tempering heat treatment in order to improve the mechanical characteristic and therefore its relevant performance.  
Avantages of fabricated girth gears
The forged material structure excludes the risk of inclusions
Structure defects like gas holes, micro shrinkage, pin holes, hot tears, sand and slag inclusions are avoided
Hence, repair welding of the body structure and e.g. grinding of toothed areas is not required.
The fabricated manufacturing procedure excludes the need for patterns and risers
Rim material has higher hardness and higher strength than the material used for the underlying structure (i.e. web, gussets)
These features will reduce the lead time and costs. Fabricated manufacturing ensures a fast delivery.
This is especially beneficial in an emergency situation, where the existing gear rim is suffering from damage   
Features
External teeth 
Maximum diameter: 16000 mm 
Toothed face width: 1700 mm 
Maximum module: 45 by hob 
Maximum module: 65 gear finishing cutter
Internal teeth 
Maximum Diameter: 6500 mm 
Maximum module: 25.4 
Toothed face width: 400 mm
Forging material process 
Forging 
Final rolling 
Furnace cooling 
Control on production 
Water quenching 
Hardness testing 
Rough machining 
Ultrasonic testing and dimensional inspection 
Final inspection certification

Standards/Certificates 
UNI EN ISO 
AWS 
ASTM 
ASME 
DIN 
Applications 
Our girth gears are applied in the cement and minerals industries: 
Various types of horizontal mills 
Rotary dryers 
Rotary kilns 
Any other large gear ring application
Pinions
ZTIC Gear invested in significant resources and achieved many innovations with pinions. The right combination of material, hardness and finishing between pinion and gear is crucial for a long lifetime of the installed equipment. We design and manufacture pinions to match every customers need, no matter how unique the situation might be. 

Pinion design
bored
solid on shaft / integral
self aligned
spur, helical or double helical
Materialization
forged alloyed steel
through hardened, case hardened or quenched and tempered
Spur, helical or double helical
carburized
induction
nitrided
Characteristics
gear cutting with hobs
the gear quality is checked by profile tester
tooth flank modification
- profile correction 
- lead correction (straight/barrel)
designs /ratios according to ISO-DIN-A.G.M.A.
FEM/FEA simulation software
Standards/Certificates
UNI EN ISO
AWS
ASTM
ASME
DIN
Applications 
Our pinions are applied in the cement and minerals industries:
Ball - mills
ROD - mills
Semi Autogeneous Grind (SAG)
Rotary kilns/coolers/dryers
Advantages
One Source
Original Equipment Manufacture (OEM) Technical Drawings
Gearing technical expertise for kilns and grinding mills
State of the art manufacturing facilities and quality
Global sales and service support
Rotary  Kiln Girth Gears
We are leading supplier the Kiln Girth Gears for the various plants as listed below.
Sponge Iron Plants  50TPD 100TPD 300TPD350TPD,500TPD,1000TPD
Cement plants as per customer requirement
Gears for phosphate mines, Alumina plant, kaolin-bentonite
Gear Cutting Capacity:
100mm diameter to 16000mm diameter
10Module to 70Module
The Kiln girth gears are available mainly in bi-part, four parts, 8 parts or multi segments as per the requirement and suitability with the application of gear.
 
In the field of grinding mill components, We supply mill heads,feed inlet,grinding roller,cement kiln riding ring, casting gears, shaft block .Also we supply mill shell of welding structures and fabrications.
 
Quality assurance documents
The following reports are to be submitted to Quality Assurance:
a. Chemistry report
b. Physical report
c. Heat treatment documents
CITIC HMC  Q/HM 973.2-2007
Specification for Steel Castings for Grinding Mills
1 5
d. Ultrasonic inspection report (before and after repairs)
e. Magnetic particle inspection report (before and after repairs)
f. Dimensional report
g. Weld repair maps
h. Weld procedures and Procedure qualification record
i. Welder qualification
j. Nondestructive testing inspector qualification