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Trunnion wheel is a wheel mounted on a trunnion, which is a cylindrical pivot. It is designed to facilitate controlled rotation and support heavy loads in various mechanical systems and machinery. Trunnion wheels are used in applications such as industrial machinery, vehicles, material handling equipment, mining equipment, and marine applications.
Core Functions and Structural Features
Idler rollers are typically used in conjunction with a "stop roller" (which prevents axial movement of the drum). Their core structure is composed of a "roller body + shaft + bearing housing":
The roller body: directly contacts the rotating drum, bearing the drum's weight and rotational friction, and requires high strength and wear resistance.
The shaft: secures the roller body and transmits load to the bearing housing, requiring sufficient rigidity and fatigue resistance.
The bearing housing: connects the shaft to the equipment frame and houses a built-in bearing (such as a spherical roller bearing) to reduce rotational resistance. It must be sealed against dust and water.
common materials
|
Part |
Commonly used materials |
Material characteristics and applicable scenarios |
|
Roller body
|
Ordinary carbon steel (Q235, 45# steel) |
Low cost, easy to process, suitable for medium and low temperature (≤300℃) and light load conditions (such as small ball mills); |
|
Alloy structural steel (40Cr, 35CrMo) |
High strength, high toughness, and fatigue resistance, suitable for medium to high temperature (300-600℃) and medium to heavy load conditions (medium-sized rotary kiln/ball mill); |
|
|
Heat-resistant steel (ZG3Cr24Ni7SiN, ZG2Cr25Ni20) |
Resistant to high temperature oxidation (≤1000℃) and high temperature creep, suitable for high temperature section of rotary kiln (such as calcining zone); |
|
|
Wear-resistant cast iron (high chromium cast iron, nickel hard cast iron) |
High hardness (HRC ≥ 50) and high wear resistance, suitable for ball mills (great wear on the rollers during material grinding); |
|
|
Axis |
Alloy structural steel (40Cr, 42CrMo) |
High hardness after quenching (HRC28-32), anti-bending/anti-torsion, ensuring support rigidity; |
|
Bearing seat |
Gray cast iron (HT200, HT250) or ductile iron (QT450-10) |
Low cost, good shock absorption, and can be used with seals (such as labyrinth seals and oil seals) to improve dust and water resistance; |
Functions
Rotation: The primary function of trunnion wheels is to facilitate the rotation of the attached component, such as a shaft or a drum.
Load Support: Trunnion wheels provide support for heavy loads, distributing the weight and minimizing friction during rotation.
Alignment: The trunnion ensures proper alignment of the wheel, preventing wobbling or misalignment during rotation.
machinery processing
Trunnion wheel processing primarily involves the roller body, shaft, and assembly processes. The roller body is first forged into a blank based on the material used. This blank undergoes rough machining, targeted heat treatment (such as quenching and tempering of alloy steel), and final finishing to an IT6-IT7 precision. The shaft is forged from round steel and subjected to rough turning, quenching and tempering, achieving IT5-IT6 precision on key surfaces. The shaft ends are optionally chrome-plated after treatment. Assembly is typically performed by press-fitting the roller body and shaft, typically using heat treatment. Simultaneously, spherical roller bearings are installed and greased, and labyrinth and oil seals are used to prevent impurities.
applications
|
Device type |
Main application industries |
Specific environmental characteristics |
|
Rotary kiln |
Building materials (cement, lime), metallurgy (non-ferrous metal smelting), chemicals (roasting) |
1. High temperature: roller working temperature 50-800℃ (the temperature at the kiln head/kiln tail is low, and the temperature of the calcining zone in the kiln is high); 2. A lot of dust: Calcination of materials produces a lot of dust (such as cement raw material powder, mineral powder); 3. Heavy load: The weight of the cylinder + material can reach hundreds of tons, and the rollers need to withstand large static and dynamic loads. |
|
Ball mill |
Mining (ore grinding), building materials (cement clinker grinding), power (desulfurization limestone grinding) |
1. Medium to low temperature: operating temperature 20-150℃ (no high temperature during the grinding process, only the motor heat dissipation slightly increases the temperature); 2. High wear: Grinding materials (such as ore, steel balls) may overflow, causing abrasive wear on the roller surface; 3. Large vibration: When the cylinder rotates, the steel balls collide with the material, generating periodic vibrations. The rollers need to resist vibration fatigue. |
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