Among the core components of a jaw crusher, the moving jaw is known as the "crushing execution center", and its design rationality directly determines the crushing efficiency, stability and service life of the equipment. As a jaw crusher suitable for medium and large-scale primary crushing scenarios, the SHILONG CL200 integrates high-strength structural design and precise transmission logic in its moving jaw, demonstrating outstanding performance in heavy-duty crushing operations in industries such as mining and building materials. This article will comprehensively analyze the professional characteristics of the moving jaw from four dimensions: structural composition, core technology, performance advantages and maintenance points.
1. Structural Composition: Heavy-duty Designed "Force-bearing Framework"
The moving jaw of the SHILONG CL200 adopts an integral high-strength welded steel structure, with the main material being Q345B low-alloy high-strength steel. This material has excellent weldability and impact toughness, which can effectively withstand the periodic extrusion force of thousands of kilonewtons during the crushing process. The welding process strictly complies with the GB/T 985.1-2008 standard, and all load-bearing welds must pass JB/T 5000.3-2007 Class Ⅱ or above non-destructive testing to ensure the weld penetration rate and internal defect control meet the standards. The whole body undergoes annealing heat treatment after welding, with the temperature controlled at 600-650℃, which effectively eliminates welding residual stress and avoids cracking risks caused by stress concentration during long-term operation.
The front of the moving jaw fixes the manganese steel movable jaw plate (ZGMn13 material) through a wedge pressing mechanism. After water toughening treatment, the jaw plate can reach a hardness of 200-250HB and an impact toughness of ≥196J/cm², showing excellent wear resistance when crushing hard rocks such as granite and basalt. The upper inner hole is equipped with double-row self-aligning roller bearings, which form a precise fit with the eccentric shaft processed by heavy forging billet. The bearing seal adopts a labyrinth dust-proof structure, which can effectively block the invasion of dust; the lower part is hinged with the wedge adjustment mechanism on the rear wall of the frame through the toggle plate, forming a complete crank-rocker transmission system. It is worth noting that the overall weight of the moving jaw reaches 32 tons, and the heavy-duty design provides a basic guarantee for its stable load-bearing.
2. Core Technology: Dual Guarantee of Crushing Efficiency and Safety Protection
1. Precise Transmission and Energy Optimization
The driving of the moving jaw relies on the eccentric shaft-flywheel combination system. The eccentric shaft is made of 42CrMo forged steel, with a hardness of 220-250HB after quenching and tempering treatment, and a surface roughness of ≤Ra1.6μm, ensuring smooth operation. The large cast steel flywheels configured at both ends not only play the role of inertial energy storage but also balance the motor load. They release the stored energy when the moving jaw is in the working stroke (approaching the fixed jaw) and absorb energy during the idle stroke (moving away from the fixed jaw), effectively reducing the fluctuation range of motor power and adapting to the production capacity requirement of 300-800 tons per hour.
2. Hierarchical Protection and Overload Emergency
In view of the uncrushable foreign objects (such as scrap steel and iron blocks) that may appear in the crushing operation, the moving jaw integrates a toggle plate fracture protection mechanism. A low-strength alloy toggle plate is used as a mechanical safety component, and its fracture strength is set to 1.2 times the allowable load of the moving jaw. When foreign objects enter the crushing cavity and cause overload, the toggle plate will break first, cutting off the power transmission path and avoiding damage to core components such as the moving jaw and eccentric shaft due to overloading. At the same time, the wedge adjustment mechanism can change the relative position of the moving jaw and the fixed jaw through adjusting bolts, flexibly adjusting the discharge port size (usually in the range of 150-300mm) to adapt to different particle size requirements.
3. Performance Advantages: Key Characteristics for Heavy-duty Working Conditions
In practical applications, the CL200 moving jaw shows three core advantages: First, strong structural stability. The integrated welding-annealing process controls the deformation of the moving jaw within 0.1mm/m during continuous operation, ensuring the stable gap of the crushing cavity; Second, high crushing efficiency. The moving jaw swing frequency is set to 280 times per minute, and the stroke characteristic is optimized to "small upper and large lower", which not only ensures smooth feeding in the upper part but also enhances the discharging capacity in the lower part. The product particle shape is cubic, with the content of needle and flake particles ≤15%; Third, low maintenance cost. The manganese steel movable jaw plate can be turned around for use, with a service life of 800-1200 hours. The bearing lubrication adopts a centralized lubrication system, and the grease replacement cycle is extended to 500 hours, effectively reducing the downtime for maintenance.
4. Maintenance Points: Practical Suggestions for Extending Service Life
To give full play to the performance of the moving jaw, three points should be paid attention to in daily maintenance: First, regularly check the fit gap between the toggle plate and the bushing, and replace it in time when the gap exceeds 0.5mm to avoid increasing the impact load; Second, monitor the wear condition of the movable jaw plate, and turn it around or replace it when the plate thickness wear reaches 1/3 of the original size to ensure crushing efficiency; Third, disassemble and inspect the bearing every 1000 working hours, measure the radial clearance, and replace the bearing in time when the clearance exceeds 0.2mm. In addition, it is recommended to conduct surface flaw detection on the moving jaw welds every 3 months, focusing on checking the stress concentration areas to prevent crack expansion.
3、Conclusion
The moving jaw of the SHILONG CL200 jaw crusher integrates heavy-duty structural design, precise transmission technology and hierarchical protection mechanism, constructing an operation system of "efficient crushing - safety protection - low consumption maintenance". Its overall weight of 32 tons, integrated welding-annealing process and toggle plate safety design make it an ideal choice for medium and large-scale primary crushing working conditions. In practical applications, standardized maintenance management is required to fully release its performance potential, providing reliable guarantee for the continuous production of mining, building materials and other industries.