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1. PainPoint Driven Opening

Is inconsistent limestone feed size reducing your crusher throughput by 1218%? For contract manufacturers, every ton of material that requires rehandling or secondary crushing cuts directly into narrow margins. High silica content in limestone accelerates wear on standard tooling, leading to unscheduled downtime that can cost $8,000–$15,000 per hour in lost production and labor.

Are you struggling to meet strict spec for agricultural lime (AgLime) or cement kiln feed without excessive fines generation? Traditional impact crushers often produce 30% more minus200 mesh material than required, wasting valuable product and increasing dust suppression costs.

How do you maintain a consistent 1.5inch minus product when moisture content spikes above 6%? Wet limestone causes blinding on vibrating screens and packing in cone crushers, forcing your plant to run at 60% capacity.

This datasheet addresses these challenges directly. We present a heavyduty, modular Limestone Mining Contract Manufacturer solution designed for highwear, variablefeed environments.

2. Product Overview

Equipment Type: HeavyDuty Horizontal Shaft Impactor (HSI) with Adjustable Apron System – specifically engineered for contract limestone processing.

Operational Workflow:
1. Feed: Runofmine (ROM) limestone (up to 36" feed size) enters the crusher via a vibrating grizzly feeder, which bypasses minus2" material to reduce wear.
2. Primary Crushing: Material is struck by highinertia rotor bars, impacting the primary apron curtain. This initial breakage occurs along natural cleavage planes.
3. Secondary Reduction: Material is directed to the secondary apron curtain for further reduction. Hydraulic adjustment allows for gap changes in under 5 minutes.
4. Discharge: The crushed material exits the rotor path. A large discharge clearance prevents plugging from wet or sticky material.
5. Sizing Control: An optional third apron or grinding path can be engaged for finetuning product gradation for specific contracts (e.g., 8 stone vs. AgLime).

Application Scope:

• Primary Use: Limestone, dolomite, and mediumhard marl.
• Limitations: Not recommended for material with compressive strength exceeding 200 MPa (e.g., granite, basalt) or abrasive quartz content above 15%.

3. Core Features

HighInertia Rotor Assembly | Technical Basis: Kinetic energy storage (WR²) | Operational Benefit: Handles large feed surges without stalling, reducing motor overload trips | ROI Impact: Reduces electrical peak demand charges by 812% and eliminates jamclearing labor costs.

Hydraulic Apron Adjustment System | Technical Basis: Accumulatorbased pressure relief | Operational Benefit: Operators can change product size from 3" to 1" in under 2 minutes without tools | ROI Impact: Increases uptime by 46 hours per month during specchange contracts.



Replaceable Alloy Wear Liners (AR500 + Chrome Carbide) | Technical Basis: Highhardness overlay (550650 BHN) | Operational Benefit: Extends liner life by 40% compared to standard manganese steel in highsilica limestone | ROI Impact: Reduces annual wear parts cost by $18,000–$25,000 for a 500 TPH plant.

Open Discharge Housing Design | Technical Basis: 30% larger clearance than industry standard | Operational Benefit: Prevents material packing when moisture exceeds 8%, eliminating daily cleanout | ROI Impact: Recovers 1.5 hours of production per shift during wet season.

Modular SkidMount Frame | Technical Basis: ISO container footprint | Operational Benefit: Allows relocation to new quarry sites within 48 hours using standard flatbed trucks | ROI Impact: Reduces site mobilization costs by 60% for contract manufacturers.

4. Competitive Advantages

| Performance Metric | Industry Standard (Cone/Jaw Combo) | Our Limestone Mining Contract Manufacturer Solution | Advantage (% improvement) |
| : | : | : | : |
| Throughput (TPH) | 350400 TPH | 450550 TPH | +25% |
| Fines Generation (200 mesh) | 1822% | 812% | 50% |
| Crusher Liner Life (tons) | 180,000 tons | 260,000 tons | +44% |
| Product Cubicity (Cubical shape %) | 65% | 85% | +31% |
| Changeover Time (spec change) | 45 minutes (shims) | 4 minutes (hydraulic) | 91% |
| Moisture Handling Capacity | Up to 4% | Up to 10% | +150% |

5. Technical Specifications

| Parameter | Specification |
| : | : |
| Rotor Diameter | 54 inches (1,372 mm) |
| Feed Opening | 36" x 48" (914 mm x 1,219 mm) |
| Capacity Range | 300 – 600 TPH (depending on gap setting) |
| Motor Power | 350 HP (260 kW) – 500 HP (373 kW), TEFC |
| Rotor Speed | 600 – 900 RPM (variable via VFD) |
| Weight (Crusher Only) | 42,000 lbs (19,050 kg) |
| Material Specifications | Housing: A36 Plate; Liners: AR500 / Chrome Carbide Overlay; Rotor: 4140 Alloy Steel |
| Physical Dimensions (L x W x H) | 12' 6" x 8' 2" x 10' 4" (3.8m x 2.5m x 3.15m) |
| Environmental Range | Operating Temp: 20°F to 120°F; Suitable for outdoor installation with optional weather enclosure |

6. Application Scenarios

LargeScale Cement Plant Contract | Challenge: A contract manufacturer needed to supply 2.5 million tons of 1.5inch minus limestone for a new cement kiln, but the quarry had high moisture (7%) and clay content. | Solution: Deployed the HSI with open housing and hydraulic apron control. | Results: Achieved 98% uptime over 18 months. Reduced reject material from 12% to 3%. Client renewed contract for 3 additional years.

Agricultural Lime (AgLime) Production | Challenge: Producing 95% passing 60mesh AgLime from hard, highsilica limestone without excessive wear. | Solution: Utilized the third grinding path and chrome carbide liners. | Results: Liner life exceeded 200,000 tons. Power consumption dropped to 8.5 kWh/ton, compared to 11 kWh/ton with a ball mill. Profit margin increased by $0.45/ton.

Road Base Material for Highway Project | Challenge: Meeting strict LA Abrasion and cubicity specs for a state DOT project. | Solution: Set the HSI to a closed side setting of 1.25 inches with a single pass. | Results: Achieved 92% cubicity (fractured faces). Eliminated the need for a secondary cone crusher, saving $350,000 in capital expenditure.

7. Commercial Considerations

Equipment Pricing Tiers (FOB Factory):

• Base Model (300 TPH): $185,000 – $215,000 (Includes motor, Vbelt drive, standard AR liners)
• Production Model (450 TPH): $265,000 – $310,000 (Includes hydraulic apron, heavyduty rotor, chrome carbide liners)
• HighCapacity Model (600 TPH): $395,000 – $450,000 (Includes third apron, autolube system, premium bearings)

Optional Features:

• AutoLube System: $12,500 (Reduces daily maintenance by 30 minutes)
• VFD Control Package: $28,000 (Allows finetuning of rotor speed for specific contracts)
• Remote Monitoring Kit: $8,500 (Provides realtime amp draw and bearing temp data)

Service Packages:

• Standard Warranty: 12 months / 2,000 hours.
• Extended Service Plan: $15,000/year (Includes quarterly inspections, priority parts delivery, and 24/7 phone support).
• Wear Parts Management Program: Prenegotiated pricing on liners with guaranteed stock availability.

Financing Options:

• LeasetoOwn: 36 or 48month terms with $1 buyout.
• Equipment Loan: Rates starting at 6.9% APR for qualified buyers (subject to credit approval).
• Seasonal Payment Plan: Lower payments during offseason months.

8. FAQ

Q: Can this unit handle limestone with high chert or flint nodules?
A: Yes. The chrome carbide overlay liners are specifically designed to resist abrasion from hard silica inclusions. Field data shows a 35% increase in liner life compared to standard manganese in chertbearing limestone.

Q: What is the typical installation time for this skidmounted system?
A: For a prepared concrete pad with electrical supply, installation and commissioning typically takes 35 days. The modular design reduces rigging time by 60% compared to fixedbase crushers.

Q: How does the hydraulic apron system improve safety?
A: It eliminates the need for operators to enter the crusher chamber to adjust shims or change settings. All adjustments are made from a remote pendant, reducing confined space entry risks.

Q: What is the ROI timeline for the VFD package?
A: Most contract manufacturers see a payback period of 812 months. The VFD allows you to reduce rotor speed for softer stone (saving power) and increase speed for harder stone (maintaining spec), reducing overall kWh/ton by 1015%.

Q: Can this crusher be used for recycling concrete or asphalt?
A: It is optimized for limestone. While it can process concrete with rebar, the rotor design is not ideal for highrebar content. We recommend a dedicated recycling impactor for that application.

Q: What is the lead time for replacement wear parts?
A: Standard AR500 liners ship within 5 business days. Chrome carbide liners have a lead time of 34 weeks. We recommend keeping a set of primary impact aprons in stock for critical contracts.

Q: Does the equipment comply with current OSHA and MSHA noise regulations?
A: Yes. The housing is designed with sounddampening panels. At 50 feet, the unit operates at 85 dBA. We recommend operators wear hearing protection as a standard safety practice.