Granite Twin-Rotor Sand Maker for Concrete Batching
Learn about the working principle, technical specifications, selection criteria, and maintenance tips for the Granite Twin-Rotor Sand Maker for Concrete Batching. Designed for concrete batching plants with throughput from 20 to 280 t/h. Last updated August 2026.This article is compiled by a technical editor in the concrete equipment field. The content is based on actual equipment operational data and third-party test reports. All case studies and measured data cited are from publicly verifiable project records.
What Is the Granite Twin-Rotor Sand Maker for Concrete Batching？
The Granite Twin-Rotor Sand Maker for Concrete Batching is a twin-rotor sand making machine specifically designed for aggregate production in concrete batching plants. This equipment uses a dual-rotor counter-rotating structure to crush hard materials such as granite and limestone into manufactured sand ranging from 0 to 5 millimeters in a single pass. Compared to single-rotor crushers, its crushing ratio is increased by 40%, with a single-unit throughput ranging from 20 to 280 tons per hour.
The equipment underwent its third-generation structural optimization in 2025, with rotor linear speed increased to 65 meters per second, representing an 18% improvement in crushing efficiency over the previous generation. The global sand making production line equipment market was valued at approximately $13.4 billion in 2025, with the Asia-Pacific region accounting for about 58% of the market share. ZSJ series equipment serves this continuously growing market demand.
How the Granite Twin-Rotor Sand Maker for Concrete Batching Achieves Efficient Sand Production？
Granite twin-rotor sand maker for concrete batching is primarily composed of the main frame, dual rotors, crushing plates, impact hammers, grate bars, and a hydraulic opening device. Material enters the crushing chamber where the hammers on the first rotor strike and break the material. The material gains kinetic energy and is propelled at high speed toward the second rotor. Since the second rotor moves in the opposite direction to the incoming material, the impact velocity equals the sum of both speeds. After multiple cycles of impact crushing, the material is discharged through the gaps between the grate bars.
The grate bar spacing can be flexibly adjusted according to the required finished product particle size. The horizontal rotor arrangement overcomes the natural limitation of vertical crushers where rotor size is restricted, allowing for larger capacity designs. A material distribution impact device inside the crushing chamber evenly distributes material above both rotors, maintaining balanced load between the two rotors.
Core Advantages of the Granite Twin-Rotor Sand Maker for Concrete Batching
The advantages of this equipment in terms of throughput, durability, and product quality are concentrated in six key aspects.
The dual-rotor structure significantly increases single-unit output, with one machine capable of meeting the sand and stone requirements of a medium-sized batching plant.The rock-on-rock autogenous crushing principle effectively reduces hammer wear, with a single set of hammers processing approximately 80,000 to 100,000 tons of limestone.The fully hydraulic opening housing allows for quick replacement of internal components, reducing maintenance time by 40% compared to traditional structures.The rotors are equipped with high-manganese high-chromium protective sleeves and tungsten alloy steel bushings at the hammer shaft holes for enhanced impact resistance.The finished product has a cubic particle shape, rounded edges, continuous gradation, and a fineness modulus adjustable between 2.4 and 3.2.
One machine can simultaneously produce both coarse aggregate and manufactured sand, simplifying the traditional multi-stage crushing process, and it adapts well to materials with moisture content up to 8%.
Granite Twin-Rotor Sand Maker for Concrete Batching Technical Specifications
The product offers four models to meet different capacity requirements. The technical specifications are presented in the table below.
| Model | Feed Opening mm | Feed Size mm | Motor Power kw | Capacity t/h | Dimensions mm |
|---|---|---|---|---|---|
| ZSJ-0808 | 750×220 | <30 | 2×55-75 | 20-50 | 5500×1843×1600 |
| ZSJ-1213 | 1290×240 | <30 | 2×160 | 80-120 | 3400×2587×2050 |
| ZSJ-1218 | 1800×290 | <30 | 4×132 | 180-250 | 3600×3312×1900 |
| ZSJ-1416 | 1630×260 | <30 | 4×160-200 | 210-280 | 4712×3170×2300 |
The ZSJ series twin-rotor sand maker is primarily suitable for medium-hardness materials such as limestone and bluestone. For high-hardness materials like granite and basalt, models with higher power configurations and targeted process adjustments are recommended. Final model selection should be based on material test results. The parameters above are industry standard reference values.
Material Range Suitable for the Granite Twin-Rotor Sand Maker for Concrete Batching
Granite twin-rotor sand maker for concrete batching is capable of processing a wide range of materials, from high-hardness to medium-hardness materials, and from natural stone to industrial waste.
Granite and basalt are high-hardness materials where the dual-rotor kinetic energy is sufficient, the crushing ratio is high, and the crushed sand crushing value can be controlled below 12%.
Limestone and bluestone are medium-hardness materials with outstanding fine crushing performance, cubic particle shape, and hammer service life reaching 80,000 to 100,000 tons.
River pebbles and quartz stone are used to produce high-quality manufactured sand that fully meets the aggregate standards for concrete batching plants.
Mine tailings and construction waste can be recycled, effectively reducing raw material procurement costs.
The equipment is widely used in commercial concrete batching plants, aggregate quarries, cement plants, and refractory material plants.
Selection and Maintenance Guidelines for the Granite Twin-Rotor Sand Maker for Concrete Batching
Proper model selection requires consideration of three core factors: capacity requirements, material hardness, and installation and maintenance conditions.
Capacity matching: Select ZSJ-0808 for throughput below 50 t/h, ZSJ-1213 for 50 to 150 t/h, and ZSJ-1218 or ZSJ-1416 for throughput above 150 t/h.
Material hardness: For hard materials like granite and basalt, higher-power models such as ZSJ-1416 with process adjustments are recommended. For medium-hardness materials like limestone and bluestone, the ZSJ-1213 standard configuration is sufficient.
Installation and maintenance: Adequate space must be reserved based on the equipment dimensions. The foundation weight should be approximately 8 to 10 times the equipment weight, and foundation depth must exceed the local frost depth. Routine maintenance requires checking grate bar gaps each shift, inspecting bearing lubrication monthly, and regularly testing hydraulic system seals to ensure smooth housing opening and closing.
Granite Twin-Rotor Sand Maker for Concrete Batching Performance Validation and Case Studies
The measured crushing performance data for the equipment on four common materials is presented below.
| Material Type | Feed Size mm | Output Size mm | Sand Yield Rate | Energy Consumption kWh/t | Hammer Set Throughput 10,000 t |
|---|---|---|---|---|---|
| Granite | <30 | 0-5 | 52% | 0.8 | 3-5 |
| Limestone | <30 | 0-5 | 58% | 0.6 | 8-10 |
| Basalt | <30 | 0-5 | 48% | 0.9 | 2-4 |
| River Pebble | <30 | 0-5 | 50% | 0.7 | 4-6 |
The Huafeng Quarry in Loudi, Hunan Province, commissioned a 300 t/h granite sand making production line in 2016. The line is equipped with one ZSJ1213 twin-rotor sand maker with feed size controlled below 30mm and throughput of 80 to 120 t/h. The equipment has maintained stable operation since commissioning, producing aggregates with good particle shape and high gradation quality. A 160 t/h granite crushing and sand making project in Turkey further validates the feasibility of twin-rotor sand making technology for processing high-hardness materials.
Granite Twin-Rotor Sand Maker for Concrete Batching Frequently Asked Questions
Q: How to choose between the Granite Twin-Rotor Sand Maker for Concrete Batching and a VSI sand maker?
A: The product features a horizontal twin-rotor structure that can produce both aggregate and sand simultaneously, making it suitable for batching plants with comprehensive requirements for aggregate shaping and sand yield. VSI vertical-shaft units are more specialized for sand production with relatively limited single-machine functionality.
Q: Can the finished sand from the Granite Twin-Rotor Sand Maker for Concrete Batching meet the 2025 national standards?
A: The finished granite sand has a stable crushing value within 12%. The stone powder content can be controlled below 15% by adjusting the grate gap and linear speed, meeting Class II and above requirements of GB/T 14684-2022 and the 2025 revised draft.
Q: Why do the high-capacity models of the Granite Twin-Rotor Sand Maker for Concrete Batching use four motors instead of two?
A: The ZSJ-1218 and 1416 models use four motors to distribute the load across individual motors, ensuring more balanced torque output at high linear speeds while reducing the starting current surge on each motor.
Q: How does the Granite Twin-Rotor Sand Maker for Concrete Batching handle grate bar clogging with high-moisture materials?
A: The equipment incorporates a self-cleaning device inside the crushing chamber, combined with a special anti-clogging curved grate bar profile, allowing online cleaning without stopping operation when processing materials with approximately 8% moisture content.
