The wear-resistant liner plates of jaw crushers are worth exploring

A jaw crusher consists of a working chamber formed by a moving jaw and a fixed jaw. Both the moving and fixed jaws endure immense crushing forces and material friction, making them prone to wear. To protect the jaw plates, wear-resistant liner plates—also known as crushing plates—are typically installed on their surfaces. Lining plates are one of the main components of jaw crushers. Their service life directly impacts equipment efficiency and production costs, as they bear the full crushing force of the material.

Working Principle of Jaw Crushers:

Jaw crushers operate on a reciprocating squeezing mechanism. An electric motor drives the belt and pulley system, causing the eccentric shaft to move the movable jaw up and down. When the movable jaw rises, the angle between the toggle plate and the movable jaw increases, pushing the movable jaw plate toward the fixed jaw plate. Simultaneously, the material is crushed or split, achieving the crushing objective. As the movable jaw descends, the angle between the toggle plate and the movable jaw decreases. Under the force of the tie rod and spring, the movable jaw plate moves away from the fixed jaw plate, allowing the crushed material to discharge from the lower opening of the crushing chamber. With the continuous rotation of the motor, the movable jaw performs periodic crushing and discharging cycles, enabling batch production.

As evident from the above description, the fixed liner plates (tooth plates), movable jaw liner plates, and side liner plates of the jaw crusher are the most susceptible to wear. Severe wear on these liner plates can result in larger product particle sizes. Moreover, beyond protecting the crusher body and extending its service life, the liner plates critically influence grinding efficiency, capacity, energy consumption, wear rates of grinding media and liners, and the dynamic distribution of grinding media due to their distinct working surface geometries.

Factors Affecting Liner Wear Resistance:

1. Properties of the crushed material, though these cannot be artificially altered or selected.

2. Liner material: While material selection is possible, superior materials come at a cost. Beyond technical performance, comprehensive economic indicators are the primary basis for selection.

3. Moving jaw motion: This determines the relative movement and stress conditions between crushed material and liners during crushing and discharge.

Three Key Points to Note During Operation:

1. Liner Material Selection: Liners should be made of wear-resistant materials. Generally, white cast iron is used for small-scale applications, while high-manganese steel is employed for large-scale ones. All liners are secured with countersunk bolts and can be replaced at any time after wear. To ensure even stress distribution across the liner, a plastic spacer—such as lead plate, aluminum plate, zinc alloy plate, low-carbon steel plate, or cement mortar—is often inserted between the liner and jaw plate to guarantee a tight fit.

2. Installation Considerations: Since liner surfaces are typically cast with wavy or triangular profiles, adjacent liners' peaks and valleys interlock during installation. This configuration not only applies compressive force to the material but also induces bending and splitting actions, facilitating efficient crushing. The tooth peak angle of the liner plate is generally 90° to 120°. For coarse crushing, a wavy surface with a larger angle is recommended. The tooth pitch depends on the material particle size, typically close to the crushing size. The ratio of tooth height to tooth pitch is generally 1/2 to 1/3.

3. Preventing liner wear: Wear on jaw crusher liners is uneven, with the lower section typically wearing faster. Therefore, to extend service life, the thickness of the fixed plate should be increased. The original thickness of 70mm can be increased to 140mm. After thickening the liner plate, the angle between the movable jaw and fixed jaw of the jaw crusher is reduced by 2°, and the crushing efficiency is increased by 12%. The discharge center moves 70mm away from the machine body, aligning with the centerline of the discharge hopper, which also reduces wear on the discharge hopper liner plate.

(Technical parameters and data mentioned herein may be updated with product upgrades. Click website customer service for the latest equipment specifications.)

OCP Heavy Industry specializes in manufacturing wear-resistant crusher components. Our jaw crusher liners feature high tensile strength, toughness, plasticity, and non-magnetic properties, ensuring extended service life for the tooth plates. We welcome visits to our Luoyang facility to inspect our workshops and crushers. Consult our experts for crusher selection, production line design, and maintenance guidance—professional solutions await! Click website customer service for immediate free consultation.