jaw crusher pe1200×1500
The PE1200×1500 Jaw Crusher: A Workhorse for High-Capacity Primary Crushing
The PE1200×1500 jaw crusher is a large-format primary crushing machine designed for the most demanding mining and quarrying applications. With a feed opening of 1200 mm by 1500 mm, this unit is engineered to handle run-of-mine material with top sizes up to approximately 1000 mm, delivering throughput capacities ranging from 300 to 800 tons per hour depending on the closed side setting (CSS) and material characteristics. This article provides a technical overview of the PE1200×1500, including its structural design, operational parameters, comparative advantages over smaller models, and practical considerations for installation and maintenance. We will also address common operational questions and provide a real-world application case to illustrate its performance in the field.
1. Core Specifications and Design Philosophy
The PE1200×1500 belongs to the classic PE series, which utilizes a simple pendulum (single-toggle) motion. The eccentric shaft drives the movable jaw plate in an elliptical path, creating a compressive force that crushes the material against the fixed jaw plate. Key specifications for this model are typically as follows:
| Parameter | PE1200×1500 Typical Value |
|---|---|
| Feed Opening (W x L) | 1200 mm × 1500 mm |
| Max. Feed Size | 900 – 1000 mm |
| Eccentric Shaft Speed | 180 – 220 RPM |
| Closed Side Setting (CSS) Range | 150 – 300 mm |
| Theoretical Capacity | 300 – 800 t/h |
| Motor Power | 180 – 220 kW (typically 200 kW) |
| Machine Weight (without motor) | ~ 100.9 tons |
The design emphasizes a heavy-duty frame, typically fabricated from welded steel plates with reinforced ribs to withstand high impact loads. The toggle plate acts as a safety device; if uncrushable material (e.g., a steel bar) enters the chamber, the toggle plate breaks, protecting the main frame and eccentric shaft from catastrophic damage. The discharge opening is adjusted mechanically or hydraulically (depending on the manufacturer) by shims or a wedge system, allowing operators to fine-tune the product size.
2. Comparative Analysis: PE1200×1500 vs. Smaller PE Models
To understand the value proposition of the PE1200×1500, it is useful to compare it against its smaller siblings, such as the PE750×1060 or PE900×1200. The primary differences are not just in size, but in the application scope and operational economics.
| Feature | PE750×1060 | PE900×1200 | PE1200×1500 |
|---|---|---|---|
| Max. Feed Size (mm) | 630 | 750 | 1000 |
| Motor Power (kW) | 110 | 132 | 200 |
| Capacity (t/h) @ CSS 150mm | 150-250 | 220-450 | 400-800 |
| Primary Application | Small/Medium Quarries | Medium/Large Mines | Large Mines, High Tonnage |
| Downstream Equipment | Secondary cone (≤ 200mm feed) | Secondary cone (≤ 250mm feed) | Secondary gyratory or large cone (≤ 300mm feed) |
Key Insight: The PE1200×1500 is not simply a "bigger" crusher; it is a primary reduction stage that eliminates the need for a separate primary gyratory crusher in many medium-scale operations. While a gyratory crusher may have a higher capital cost, the PE1200×1500 offers a lower initial investment and simpler maintenance for operations that do not require the absolute highest uptime of a gyratory. However, its power consumption per ton of product is generally higher than that of a gyratory, making it a trade-off between CAPEX and OPEX..jpg)
3. Real-World Application Case: Limestone Quarry in Southeast Asia
Background: A cement plant in Vietnam required a new primary crushing line to process hard limestone (compressive strength: 150-180 MPa) with a feed size of up to 900 mm. The target throughput was 600 tons per hour, with a final product of 0-200 mm for the secondary crushing stage.
Solution: The plant selected a PE1200×1500 jaw crusher as the primary unit, paired with a vibrating grizzly feeder (ZSW 600×150) to remove fines (<100 mm) before the crusher. The crusher was set with a CSS of 200 mm..jpg)
Performance Data (after 6 months of operation):
- Actual Throughput: 620-650 t/h (slightly above the design capacity due to good blasting practices).
- Product Size Distribution: Over 90% of the discharge was below 220 mm, with minimal flakiness (under 15%).
- Wear Life: The fixed jaw plate (high manganese steel, Mn13Cr2) lasted approximately 8 months (processing ~1.2 million tons) before requiring replacement. The movable plate lasted 7 months.
- Operational Issue: The initial hydraulic adjustment system experienced overheating due to frequent adjustments. The issue was resolved by switching to a manual shim adjustment for the CSS, as the setting was rarely changed in this fixed application.
Result: The crusher has operated for over 24,000 hours with a mechanical availability of 92%. The primary reason for downtime was scheduled liner changes and one bearing replacement due to contaminated grease. This case demonstrates that the PE1200×1500 can reliably replace a gyratory crusher in a fixed, high-tonnage limestone application, provided the feed is well-controlled.
4. Installation and Operational Best Practices
To maximize the lifespan of the PE1200×1500, consider the following technical points:
- Foundation Design: The crusher generates significant dynamic forces. The foundation must be isolated from the control room and other structures. Use rubber or spring dampers under the base frame to reduce vibration transmission.
- Feed Control: A Vibrating Grizzly Feeder (VGF) is mandatory. It not only regulates the feed rate but also removes fines and clay, which can cause packing in the crushing chamber. The feeder length should be at least 1.5 times the crusher feed opening length to ensure proper material distribution across the full width of the jaw.
- Lubrication: Use a forced circulation oil lubrication system for the eccentric shaft bearings. Monitor oil temperature (should be below 60°C) and pressure. A common failure is using the wrong viscosity oil in cold climates, leading to inadequate lubrication on startup.
- Toggle Plate Maintenance: Check the toggle plate and toggle seat for wear every 500 hours. A worn toggle seat will cause the toggle plate to slip, reducing crushing efficiency and increasing the risk of overloading the pitman.
5. Frequently Asked Questions (FAQ)
Q1: What is the maximum feed size for the PE1200×1500?
A: The theoretical maximum feed size is 1000 mm. However, for optimal performance and to avoid clogging, it is recommended that the feed material does not exceed 80% of the feed opening width (i.e., ~960 mm). Oversized boulders should be reduced by blasting or hydraulic breakers before entering the crusher.
Q2: Can the PE1200×1500 handle wet or sticky material?
A: It can, but with reduced efficiency. The simple pendulum design has a shorter stroke at the discharge opening compared to a complex pendulum (double-toggle) crusher, making it more prone to packing if the material has high clay content. If the material is sticky, a VGF with a larger grizzly gap (e.g., 120-150 mm) is essential to bypass the fines.
Q3: How often should the jaw plates be flipped or replaced?
A: This depends on the material's abrasiveness (AI - Abrasion Index). For medium-hard limestone (AI < 0.1), the fixed plate may last 6-9 months. For granite or basalt (AI > 0.3), expect to flip the plates every 2-3 months and replace them every 4-6 months. Always rotate the plates (top to bottom) to ensure even wear.
Q4: What is the difference between the PE1200×1500 and the PEX series?
A: The PE series is for primary crushing (large feed, large output). The PEX series is for secondary/fine crushing (smaller feed, smaller output). The PE1200×1500 has a much larger feed opening and a heavier frame, while a PEX crusher of similar weight would have a smaller feed opening but a longer stroke for finer reduction.
Q5: Is it possible to use a soft starter or VFD (Variable Frequency Drive) for the motor?
A: Yes, a soft starter is highly recommended to reduce the inrush current during startup, as the crusher often starts under load (with material in the chamber). A VFD is generally not recommended for jaw crushers because the crusher is designed to operate at a fixed speed for optimal crushing kinematics. Changing the speed alters the crushing angle and can reduce capacity and increase wear.
Conclusion
The PE1200×1500 jaw crusher remains a robust and cost-effective solution for high-capacity primary crushing. While it requires careful attention to feed control and lubrication, its simple design, ease of maintenance, and proven reliability make it a preferred choice for operators who need to process large volumes of rock without the complexity and higher cost of a gyratory crusher. When paired with the correct feeder and downstream equipment, it delivers consistent performance and a well-shaped product for further processing.