300 TPH Stone Crushing Production Line Configuration: Crushing of the Jaw Crusher + Cone Crusher Closed-Circuit Flowchart

200-300 TPH Stone Crushing Line

The core framework of this 300 TPH stone crushing production line consists of just five main units: Hopper (LC3000×4000) → Grizzly Feeder (ZSW1100×4200) → Jaw Crusher (C110) → Cone Crusher (CS250) or Impact Crusher (PFW1320) → Four-deck Circular Vibrating Screen (4YK2470). Supplemented by five belt conveyors (total length: 133 m), the line produces four finished aggregate sizes in a single pass: 0–5 mm, 5–10 mm, 10–20 mm, and 20–40 mm. The true technical core of this line lies not in the selection of the main machines, but in the secondary-stage closed-circuit material return system; this determines both the shape of the finished product and the load on the screen deck.

I. Standard Configuration for 300 TPH Stone Crushing Line: Five Main Units + Five Belt Conveyors

Based on the process flow chart, the main equipment configuration is as follows:

There are two configuration logics here that are easily overlooked.

First, belt width allocation: The main process flow utilizes B1000 belts (B-1, B-2); the material return line steps down to B800 (B-3); the finished product line steps down further to B650 (B-4); and only the bypass waste discharge line (B-5) uses B500. Belt width is determined by material throughput rather than by what "looks robust," thereby avoiding wasted investment across the entire conveyor system.

Second, total belt length: 15 + 23 + 25 + (15 × 4) + 10 = 133 m. Of this, the finished product discharge belts account for 60 m (4 × 15 m), or 45% of the total. A longer finished product line indicates that the screening process employs a "discharge-near-source" strategy to eliminate the need for secondary material handling. This 60-meter section represents the part of the 300 TPH stone crushing line where belt investment costs are most likely to exceed the budget.

II. Closed-loop circulation in the 300 TPH stone crushing line: B-2 and B-3 determine finished product particle shape

The material flow path is as follows: Discharge from hopper A-1 → Grizzly feeder A-2 (which also performs pre-screening, discharging fines and debris via B-5) → Primary crushing in jaw crusher A-3 → B-1 conveys material to secondary crusher A-4 → B-2 conveys material to the 4YK2470 screen → Oversized material retained on the screen is returned to A-4 via B-3, forming a closed loop.

Why use a return loop instead of simply enlarging the screen apertures to allow everything to pass through in a single pass?

There are three reasons:

1. Particle shape refinement. Jaw crushing involves single-layer compression, resulting in a high proportion of flaky and elongated particles. By returning oversized material to the secondary crusher for a second round of inter-particle (layer) crushing, the content of flaky and elongated particles in the final product is significantly reduced. This is a critical factor, as concrete mixing plants are particularly sensitive to the shape characteristics of 5–10 mm and 10–20 mm graded aggregates.

2. Elimination of oversized material. The closed-loop system continuously reprocesses oversized material. This shifts the determinant of the product pass rate from "screen aperture size" to "number of circulation cycles," allowing screen apertures to be adjusted to meet target gradation requirements without the risk of oversized particles slipping through in specific size fractions.

3. The trade-off is the load on the screen deck. Since the recirculating load is added to the raw feed, the actual load on the screen surface is approximately 20%–35% higher than in an open-circuit configuration. Consequently, the screen area must be oversized to accommodate this; the use of the 4YK2470 model for a 200–300 TPH capacity range is based on this logic.

Conveyor B-2 (B1000, 23m) serves as the forward feed line from the secondary crushing stage to the screen, while B-3 (B800, 25m) acts as the closed-loop return line for oversize material (retained on the screen) back to the secondary stage. Together, this feed-and-return arrangement creates a complete closed-loop cycle between units A-4 and A-5. These two lines are the most likely to be shortened or compromised during site layout planning due to space constraints; however, reducing their length extends the circulation cycle and risks material pile-ups on the return conveyor. The difference in belt widths—B1000 for the forward line and B800 for the return line—reflects the difference in material flow: the forward line carries the entire discharge from the secondary stage, whereas the return line carries only the oversize fraction.

Four-deck screening yields four product grades

The 4YK2470 is a four-deck circular vibrating screen; its four decks produce four distinct product grades, which are transported to four separate stockpiles via four B650 product conveyors:

Using a single four-deck screen instead of two three-deck screens in series saves not only on equipment costs but also on intermediate transfer conveyors, foundations, and electrical control circuits. Each product conveyor is intentionally kept short—at just 15 meters—allowing material passing through the screen to drop directly onto the stockpile without an extra transfer step; this minimizes both dust generation points and product segregation. For a 300 TPH stone crushing production line, a four-deck screen is the key to "eliminating one transfer point while adding an extra product size."

IV. CS250 or PFW1320: How to Choose for the Secondary Crushing Stage

The flow chart lists "CS250 or PFW1320" at position A-4; this is not an arbitrary choice between two options, but rather a selection based on the specific raw material source:

CS250 Symons Cone Crusher

• CS250 Cone Crusher: Utilizes inter-particle (lamination) crushing; liner lifespan is measured in months. It is suitable for high-hardness, highly abrasive materials such as granite, basalt, and river pebbles. A secondary line using a cone crusher yields good particle shape with low flakiness/elongation and offers a lower cost per ton over the long term.

PFW1320 Impact Crusher

• PFW1320 Impact Crusher: Utilizes impact crushing; offers a high single-pass reduction ratio and produces uniformly shaped particles. It requires lower initial equipment investment and is suitable for medium-to-low hardness, brittle materials like limestone and dolomite. However, blow bars are high-wear components; when processing highly abrasive materials, the replacement cycle is measured in weeks.

The decision-making method is simple: look at the abrasiveness of the rock sample, not just its compressive strength. Compressive strength determines the motor size required, whereas quartz content and the abrasiveness index determine how much you spend on wear parts annually. Compare the "equipment price difference" against the "annual wear-part cost difference" over a three-year cycle, and the answer usually becomes clear. If the secondary crushing stage isn't finalized, the cost per ton for the entire 300 TPH production line cannot be determined.

300 TPH Stone Crushing Line - Stationary Crushing Production Line

V. FAQ (5 Items)

Q1: How do I calculate the actual operating capacity versus the nominal capacity of a 300 TPH stone crushing line?

A1: The 200–300 TPH range marked on the flow chart represents the rated capacity for this class of line, based on medium-hardness limestone (bulk density approx. 1.6 t/m³). You must apply a conversion factor when changing materials: the limestone coefficient is approx. 1.0; for high-hardness materials like granite, it is approx. 0.75–0.85; and for lightweight materials, it is even lower. The correct approach is to select the main equipment based on a rated capacity of approximately 375 t/h (calculated as 300 &pide; 0.8), while setting the acceptance target at an actual operating capacity of 300 t/h.

Q2: Should the secondary crusher be a CS250 cone crusher or a PFW1320 impact crusher?

A2: The choice depends on the abrasiveness of the material. For hard, highly abrasive materials like granite, basalt, or river pebbles, choose the CS250; it offers long liner life and excellent particle shape. For medium-to-low hardness, brittle materials like limestone or dolomite, choose the PFW1320; it requires lower investment and produces uniformly shaped finished particles. These two options are alternatives within the flow chart, not an upgrade relationship.

Q3: Can a single 4YK2470 four-deck circular vibrating screen separate four grades of finished product in one pass?

A3: Yes, that is precisely the reason for choosing a four-deck screen instead of a three-deck one. A four-deck screen can separate four grades (0–5, 5–10, 10–20, and 20–40 mm) simultaneously, eliminating the need for intermediate transfer conveyors, foundations, and electrical control circuits required when connecting two screens in series. The prerequisite is that the screen surface area must be selected based on the load *after* accounting for closed-circuit material recirculation—as recirculation increases the load on the screen surface by approximately 20%–35%.

Q4: Will a closed-circuit loop reduce the overall production line capacity?

A4: The closed-circuit configuration itself does not reduce capacity; however, it adds the recirculated material load to the screen and the secondary crusher. Therefore, both the main crusher and the screen must be selected based on "throughput" (total material passing through) rather than just "finished product output." Conveyor B-3 (B800, 25m) serves as the return path for oversized material from the screen to the secondary crusher, while B-2 (B1000, 23m) is the forward path from the secondary crusher to the screen; together, this feed-and-return setup forms the complete closed circuit. Shortening B-3 to save space on-site would lengthen the circulation cycle and cause a buildup of recirculated material.

Q5: The total length of the conveyor system is 133m; can it be shortened to fit my site?

A5: Yes, it can. The total length of the five conveyors is 133 meters (15 + 23 + 25 + 15×4 + 10); these lengths were originally customized based on the site layout. However, adjustments are subject to priorities: the finished product conveyor B-4 (4 × 15 m) and the waste discharge conveyor B-5 (10 m) can be shortened; conversely, the closed-loop return line B-3 (25 m) should retain its angle and length margins as much as possible, as extending the circulation cycle would directly impact the product pass rate. Once the site layout plan is finalized, we can provide the conveyor arrangement drawings and the closed-loop balance calculations.

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