Girth Gear

ZM INDUSTRY CO.,LTD：Your Leading Girth Gear Supplier

ZM INDUSTRY CO.,LTD established in 2003, is an international company dedicated to providing comprehensive manufacturing and services of metallurgical equipment for the mining and metallurgy industry. Our products mainly include grinding mill, girth gear, mill liner, manganese steel casting, excavator spare parts, crusher spare parts and custom products.

Worm Gear
High Torque – Designed for stable transmission under heavy load and high reduction ratios.
Custom Design – Gear module, ratio, and worm shaft fully customized to applications.
Material...
read more
Integral Pinion Shaft
One-piece pinion gear and shaft design eliminates assembly failure risks
Optimized for gear reducers, internal gear drives, and girth gear systems
Custom-manufactured strictly to drawing...
read more
Ball Mill Gear
Material Strength: Manufactured from BS3100:1976 Grade BT-1 cast steel, delivering high load capacity and fatigue resistance.
Large Gear Accuracy: Precision gear cutting ensures stable meshing...
read more
Bevel Pinion
Material: AISI 4340 alloy steel, normalized, quenched and tempered to 300HB, delivering excellent strength and impact resistance for industrial gears.
Precision: Optimized bevel gear cutting...
read more
Double Helical Gear
Material: Manufactured from BS3100 BT1 cast steel, delivering excellent strength, fatigue resistance, and structural stability for heavy-duty gear manufacturing.
Load Capacity: Double helical...
read more
Output Gear
Heavy-duty output gear manufactured from high-strength alloy steel for extreme load conditions
Precision-machined gear teeth ensure smooth power transmission and reduced efficiency...
read more
Bell Housing
Material Strength: Manufactured from S355 JR structural steel, delivering excellent rigidity, fatigue resistance, and long-term dimensional stability.
Precision Alignment: Ensures accurate...
read more
Gearbox Housing
Material: Manufactured from SG50 nodular cast iron, offering high strength and excellent fatigue resistance.
Performance: High compressive strength, wear resistance, and impact resistance,...
read more
Hollow Shaft
Material: S355J2H / C45E
Structure: Shaft hollow, customized inner diameter
Application: Hollow shaft motor, shaft coupling, gear motor
Machining: CNC precision...
read more
Helical Gear
Controlled Tooth Accuracy – Helical gear teeth manufactured with tightly controlled profile deviation for smooth, low-backlash meshing.
Stable Helix Geometry – Optimized helix angle improves...
read more
Gear Rack
High Precision – Engineered gear rack with controlled tolerances for accurate rack and pinion motion.
High Strength – Manufactured from 42CrMo alloy steel for demanding industrial...
read more
Pinion Gear
Precision – High-accuracy pinion gear with tight tolerances for stable transmission.
Durability – Carburized & ground teeth ensure long fatigue life.
Strength – Engineered for heavy-load...
read more

First 12 3 Last

Why choose us?

Quality Control

In addition to equipment manufacturing, ZMI also focuses on the production of spare parts for mining equipment. Our spare parts undergo strict quality control to ensure their reliability and durability.

Rich Experience

After more than 20 years of unwavering dedication, ZMI has achieved remarkable success, evolving from a startup to an international company with an annual production value of 8000 tons.

High Quality

The company has consistently upheld high standards and principles of quality. Through continuous innovation and improvement, ZMI has risen to become a leading service provider in the international mining industry.

Facilities And Expertise

Through its integrated operational processing system, world-class facilities and expertise, as well as the principles of integrity and cost control, ZMI has emerged as a standout player in the mineral industry, offering clients perfect solutions.

Benefits of Girth Gear

01/

Outstanding Processing Capabilities
Our hobbing machines are capable of machining large gears with diameters of up to 12,000 mm and SAG Mill Girth Gear with a module of 40 and an accuracy class in accordance with AGMA10.

02/

Customizable
We understand that different industries and machinery require different Ball Mill Girth Gear, we offer customized gears that can be customized to fit the customer's specific needs based on drawings.

03/

High Quality
The quality of the gears depends largely on the materials used in their manufacture. We use higher quality raw materials than other options on the market, which results in higher quality gears that are able to carry high loads and higher shock loads and have a longer service life, at a good price/performance ratio.

04/

Strict Quality Inspection
Our products undergo rigorous quality testing before leaving the factory, including chemical, mechanical and microstructure testing by an independent laboratory, NDT tests including UT, RT, MT and PT,and German GS-1000 direct-reading spectrograph.

Product Specifications

Products	Girth Gear
Module	All kinds, customer can customize
Precision grade	DIN 6, DIN 7, DIN 8, DIN 10
Pressure angle	14.5 degree, 15 degree, 20 degree
Material	Medium Carbon Steel: 35#, 45# Carburizing Steel: 20CrMnTi, 20CrMnMo, 20CrMo Alloy Steel: 40Cr, 35CrMo, 42CrMo, 40CrNiMo Cast Iron: HT250, QT400 Copper, Stainless Steel, Brass, Nylon, POM, and so on
Heat treatment	Hardening & Tempering, Surface Quenching, Integral Quenching, Carburizing Quenching, Tempering, Normalizing, Nitriding
Surface treatment	Blacking, Polishing, Anodization, Chrome Plating, Zinc Plating, Nickel Plating
Application	Rotating Kiln, Drying Equipment, Roller, Dryer, etc.
Machining process	Forging, Machining, Hobbing, Milling, Shaving, Grinding, Heat treatment...

Application of Girth Gear

Metallurgy Industry
In the metallurgy industry, girth gears are widely used in rotary kilns, ball mills, and other equipment for mineral roasting and ore grinding. The girth gear is the main transmission component of these large rotary equipment, transmitting power from the motor to the equipment's cylinder or drum, ensuring the equipment's normal operation. Girth gears with different materials and structures are used in different working environments to meet the needs of various metallurgical processes.

Construction Materials Industry
In the construction materials industry, girth gears are commonly used in cement rotary kilns, cement mills, etc. Cement rotary kilns, as the core equipment for cement clinker calcination, rely on girth gears to transmit power and rotate the cylinders. In cement mills, girth gears are used to drive the cylinders to grind the cement clinker into fine powder. The large girth gears are critical components for ensuring the efficiency and quality of cement production.

Power Generation Industry
In the power generation industry, girth gears are often used in large-scale power plant equipment such as coal mills and thermal power plant generator rotary kilns. The coal mill grinds coal into powder, which is then burned in the boiler to produce steam and drive turbines for power generation. The thermal power plant generator rotary kiln is used to dispose of coal gangue and other solid waste, and the rotary cylinder is driven by a girth gear to achieve continuous and uniform drying and disposal. Girth gears play a critical role in the stable operation of power generation equipment.

Chemical Industry
In the chemical industry, girth gears are widely used in the production equipment of chemical products, such as rotary dryers, rotary kilns, etc. The chemical industry often needs to dry and dispose of chemical materials, and the rotary equipment is used to meet the needs of various chemical production processes. Girth gears are used to transmit power in these devices, ensuring efficient and safe operation of the equipment.

Quality Control

Following tests and inspections:
1.Chemical, mechanical and microstructure testing by an independent laboratory
2.Qualification of welding procedures and specifications
3.NDT tests including UT, RT, MT and PT
4.Dimensional and geometric run-out and concentricity tests
5.German GS-1000 direct-reading spectrograph
6.Micro Scope
7.Technical data packs including all reports are delivered on completion of every project.

Packaging and Shipping

How to Cooperate With Us

productcate-751-562

FAQ

Q: What are the main materials used to make girth gears?

A: Common materials include cast steel (such as alloy cast steel), which offers good strength and wear resistance. Some girth gears may also be made of ductile iron for applications where cost - effectiveness and moderate strength requirements are considered.

Q: How is a girth gear installed?

A: Installation typically involves first ensuring proper alignment of the mating components (such as the kiln or mill). The girth gear is then carefully placed around the circumference of the main component and bolted or otherwise fastened in place. It must be precisely aligned with the pinion gear to ensure proper meshing.

Q: How are girth gears manufactured?

A: They are usually cast in a foundry to approximate the desired shape. After casting, machining processes such as turning, milling, and gear cutting are carried out to achieve the final dimensions and accurate tooth profile.

Q: What factors are considered in the design of a girth gear?

A: Factors include the torque requirements of the application, the rotational speed of the equipment it is part of, the load - bearing capacity needed, the type of material being processed (in case of mills, etc.), and the expected service life.

Q: How are the teeth of a girth gear designed?

A: The tooth design takes into account the power transmission requirements, the meshing characteristics with the pinion gear, and the load distribution. Parameters such as tooth profile (e.g., involute profile), module (a measure related to tooth size), and number of teeth are carefully determined.

Q: What is the role of the tooth profile in the performance of a girth gear?

A: The tooth profile affects how smoothly the gears mesh, the load - carrying capacity, and the efficiency of power transmission. An involute tooth profile, for example, provides a constant velocity ratio during meshing and good load - sharing characteristics.

We're well-known as one of the leading girth gear manufacturers and suppliers in China. If you're going to buy high quality girth gear, welcome to get more information from our factory. Also, customized service is available.

Internal Girth Gear, , Girth Gear for Kiln