Stone Crusher PEX 1200 x 900: A Detailed Overview of a Key Jaw Crusher Model
In the realm of mineral processing, aggregate production, and construction material recycling, jaw crushers serve as the primary workhorses for coarse and intermediate crushing. Among the various specifications, the model denoted as PEX 1200 x 900 represents a specific and widely utilized type of fine jaw crusher. This designation is not arbitrary but follows a clear industry nomenclature that describes its core characteristics.
Decoding the Model: PEX 1200 x 900
The model name provides direct technical information:
- PEX: This prefix typically identifies the crusher as a “fine jaw crusher” or “secondary jaw crusher” within many Chinese manufacturing standards (e.g., akin to specifications from former machinery industry standards like JB). It is generally characterized by a crushing chamber design optimized for producing smaller output sizes compared to primary PE series crushers. The “P” stands for crusher, “E” for jaw, and “X” for fine crushing.
- 1200: This figure refers to the feed opening width, measured in millimeters. A 1200mm wide opening indicates the maximum lump size of raw material (typically rock or concrete) that the crusher can accept. This dimension is a primary factor determining the crusher’s capacity and the maximum feed size.
- 900: This figure denotes the feed opening length or gape, also in millimeters. The 900mm measurement defines the length of the opening where material enters.
Therefore, a PEX 1200 x 900 crusher has an approximate rectangular feed opening of 1200mm by 900mm..jpg)
Key Design and Operational Features.jpg)
- Chamber Design: As a PEX-series model, the 1200 x 900 crusher features a deep “V-shaped” crushing chamber. This design increases the crushing action’s efficiency by promoting inter-particle comminution (rock-on-rock crushing) and provides a higher reduction ratio in a single pass compared to standard primary jaw designs.
- Motion Characteristics: It operates on the principle of compressive crushing via a reciprocating motion. The movable jaw plate moves in an elliptical path towards and away from the fixed jaw plate. The stroke at the bottom of the chamber is greater than at the top, which aids in discharging crushed material and minimizes choking.
- Output Adjustment: The discharge opening, which determines the final product size, is adjustable. This is achieved by mechanically adjusting the position of the toggle plate or using hydraulic systems in more modern versions. The adjustable range defines the minimum and maximum product granulometry.
- Typical Application: Given its size and PEX classification, this model is commonly employed in:
- Secondary Crushing Stage: Following a primary PE series jaw crusher or a gyratory crusher to further reduce material size (e.g., from -250mm down to -50mm).
- Aggregate Production Lines: For producing well-graded base materials, railway ballast, or concrete aggregates.
- Mining Operations: Crushing mid-hard ores and rocks.
Performance Parameters (Typical Range)
Based on published specifications from various established heavy machinery manufacturers for models of this size class:
- Maximum Feed Size: Typically around 1000mm (slightly less than the opening width).
- Discharge Opening Range: Adjustable within a common range of approximately 150mm – 300mm.
- Processing Capacity: Can vary significantly with material properties (hardness, abrasiveness, moisture) and discharge setting. For standard crushed stone, capacity often ranges between 220 to 450 metric tons per hour.
- Main Drive Power: Usually requires an electric motor in the range of 110 kW to 160 kW.
Considerations for Selection
Selecting a PEX-1200×900 crusher depends on several factors:
- Material Hardness (Abrasion Index): Directly affects wear rates on manganese steel jaw plates and required power.
- Required Product Size Distribution: Must align with what is achievable within its discharge adjustment range.
- Production Capacity Needs: Must match or exceed upstream feed rates from loaders or primary crushers.
- Overall Plant Layout: Its physical dimensions and foundation requirements must be accommodated.
In summary, the Stone Crusher PEX-1200×900 is not merely an arbitrary model number but defines a specific secondary crushing machine with identifiable dimensions—a feed opening of approximately (1.2m \times 0.9m)—and predictable performance characteristics based on established engineering principles within its category. Its design prioritizes higher reduction ratios for mid-size feed materials in quarrying, mining, and recycling applications worldwide