In fields such as sand and gravel aggregate production, mining, and metallurgical waste treatment, efficient crushing equipment is crucial for improving production capacity and end product quality. Dahua PLS series vertical shaft impact crushers, as industry benchmarks, redefine the efficiency and precision of crushing medium-hard and extra-hard materials with four core advantages: fast switching between dual crushing modes, enhanced performance of key components, an intelligent lubrication system, and user-friendly maintenance. They have become the equipment of choice for hundreds of companies worldwide. Vertical Impact Crusher

 

1. Fast Dual Crushing Mode Switching: One Machine Adapts to Multiple Operating Conditions

 

The Dahua vertical shaft impact crusher's dual-mode design, featuring both "rock-on-rock" and "rock-on-iron," transcends the limitations of traditional equipment with a single function. With a simple component replacement, the two crushing mechanisms can be seamlessly switched, meeting the full range of requirements, from coarse crushing and sand making to fine shaping.

 

"Stone-on-Stone" mode: Designed specifically for high-hardness materials (such as granite and basalt), it utilizes a waterfall flow distribution system to split the material into two streams: one enters the high-speed impeller, accelerated to 50-75 m/s and ejected, while the other overflows the circumference of the feed hopper, forming a "material lining." These two streams collide at high speed within the crushing chamber, utilizing the material's self-lining principle to reduce metal wear. The resulting pellets are cubic and contain less than 5% flakes, making them ideal for high-quality manufactured sand production.

 

"Stone-on-Iron" mode: Optimized for medium-hard materials (such as limestone and concrete blocks), the material enters the impeller entirely and strikes the metal impact plate. Adjusting the impact plate angle increases the crushing ratio to 1:20, achieving a sand yield exceeding 60%. This mode increases throughput by 30% compared to "Stone-on-Stone," meeting the needs of large-scale aggregate production.

 

Both modes share a common crushing chamber. Switching between these modes requires only replacing the distributor plate and impact plate, with operation time limited to under two hours, significantly improving equipment utilization.

II. Enhanced Performance of Key Components: A Double Breakthrough in Efficiency and Durability

The innovative design of core components is key to the high production capacity and low loss of Dahua vertical shaft impact crushers. Take the impeller, bearing cartridge, and lower body as an example:

 

Deep-Cavity Four-Port Impeller: Utilizing a "deep-cavity + four-port ejector" structure, the internal space is 25% larger than traditional impellers, increasing material throughput by 40%. The impeller's speed is adjustable from 500-1800 rpm, and the optimized ejector angle ensures an impact energy conversion rate of over 85%. The impeller's upper disc is protected by a wear-resistant plate and weld overlay, extending its service life to over 3,000 hours.

 

Sealed Bearing Cartridge: The unique exhaust and dust control device and labyrinth-type sealing structure control dust ingress to less than 0.01g/m³, completely eliminating the bearing oil leakage problem of traditional equipment. The bearing cartridge is forged from 42CrMo alloy steel and dynamically balanced to G2.5 accuracy, ensuring high-speed operation stability and reducing failure rates by 60%. The lower section of the "cross"-shaped machine body has been optimized to a "cross"-shaped discharge channel, increasing its cross-sectional area by 15%. This prevents clogging by wet and sticky materials (such as ore with high clay content) and improves discharge efficiency by 20%. The machine body is lined with high-chromium cast iron (Cr26), offering five times the wear resistance of ordinary steel.

 

III. Intelligent Thin Oil Lubrication System: Ensuring 24/7 Operation

 

Targeting the high-speed, heavy-load, and dusty operating conditions of crushing equipment, Dahua Heavy Industries has developed a PLC-controlled thin oil lubrication system to provide precise and reliable lubrication protection for core components.

 

The system uses a built-in oil pump to force-feed 32# extreme-pressure gear oil to key components, such as bearings and the main shaft. Combined with an air cooling system, the system intelligently controls the oil temperature (between 35°C and 55°C), eliminating the "high-temperature failure" issue associated with traditional grease lubrication. This system offers three intelligent features:

 

Real-time Monitoring: Sensors dynamically monitor feed rate, current, spindle temperature, and vibration levels, automatically shutting down the machine and issuing an alarm if an anomaly occurs.

 

On-Demand Lubrication: Automatically adjusts lubrication flow (5-20 L/min) based on speed and load, reducing lubricant consumption by 30%.

 

Extended Maintenance Cycle: The lubricant change interval is up to 8 months, reducing maintenance requirements by six times per year compared to traditional equipment, saving over 10,000 yuan in annual maintenance costs.

 

IV. User-Friendly Maintenance Design: Reduces Operation Intensity and Downtime Costs

The maintainability of equipment directly impacts the user's overall cost of ownership. Dahua Heavy Industry has reduced maintenance effort and downtime to the lowest levels in the industry through numerous innovative details:

 

Hydraulic Self-Lifting System: Equipped with a standard suspended electric hoist and hydraulic lifting mechanism, it easily lifts components such as the upper cover, impeller, and main shaft, allowing a single person to complete maintenance work, saving 50% in labor costs compared to traditional equipment.

 

Low Guardrail + Rotating Feed Hopper: The guardrail height is lowered to 1.2 meters, and combined with a hydraulically driven feed hopper rotation mechanism, the feed hopper can be rotated to the outside of the machine body during maintenance, increasing operating space by 40%.

 

Quick-Opening Inspection Door: Quick-opening inspection doors are installed on the side of the machine body, opening up to 120°. This reduces the time required to replace wearing parts (such as the impact plate and wear-resistant liner) to less than 30 minutes.

 

According to customer feedback, this design has increased the equipment's annual effective operating time to 7,200 hours and reduced overall operation and maintenance costs by 25%.

V. Extensive Application and Market Proven: Thousands of Case Studies Testify to Their Strength

 

Due to their superior performance, Dahua Heavy Industry's vertical shaft impact crushers are in use in over 50 countries worldwide:

 

Mining: At an iron ore project in Yunnan, the PLS-1200II vertical shaft impact crusher utilizes a "rock-on-iron" method to process basalt, achieving an output of 500 tons per hour and a 98% qualified aggregate yield.

 

Construction Waste: A construction waste treatment plant in Shanghai uses the PLS-850II VSI crusher, enabling a complete production process from concrete block crushing to recycled aggregate and dry-mix mortar, achieving a 95% resource recovery rate.

 

Water Conservancy Projects: At a hydropower station in Sichuan, the equipment utilizes a "rock-on-rock" method to produce C60 concrete sand, achieving a stable fineness modulus of 2.6-2.8, meeting the requirements for high-strength concrete.

 

Since the first unit rolled off the production line in 1989, Dahua Heavy Industry has sold over 5,000 vertical shaft impact crushers, maintaining the industry's leading market share for 15 consecutive years and becoming a benchmark for "Made in China" crushing equipment.

 

With its core advantages of flexible operation, reliable performance, and easy maintenance, Dahua Heavy Industry's vertical shaft impact crushers provide efficient solutions for the crushing industry. Whether meeting the extreme challenges of hard rock crushing or the delicate demands of manufactured sand shaping, this equipment, embodying 40 years of technological expertise, continues to help customers achieve their goals of cost reduction, efficiency improvement, and green production. In the future, with the in-depth development of intelligent and modular technologies, Dahua Heavy Industry will continue to lead innovation in crushing equipment, contributing Chinese wisdom to global engineering construction and resource recycling.