POLYGON MACHINE

Twin Shaft Asphalt Mixers

win shaft asphalt mixers are a critical component of modern asphalt production, employing two horizontal shafts with counter-rotating mixing arms to thoroughly blend aggregates, bitumen, and additives into a homogeneous asphalt mix. Polygonmachine, a leading manufacturer of asphalt plants and mixing equipment, has pioneered numerous engineering advancements in twin-shaft mixer design. With a focus on innovation, quality, and high performance, Polygonmachine’s twin shaft mixers deliver exceptional mixing efficiency, robust durability, advanced heating integration, and state-of-the-art automation – all tailored for demanding applications like road construction, large infrastructure projects, and high-volume asphalt production. In this article, we delve into the technical features and innovations that set Polygonmach’s twin shaft asphalt mixers apart in the industry.

Robust Construction and Durability

A standout feature of Polygonmachine twin-shaft mixers is their robust engineering and long-term durability. These mixers are built to withstand the rigors of continuous heavy-duty operation. The entire mixer unit is housed in a heavy-gauge steel body, and all high-wear areas are protected with special abrasion-resistant liners and coatings. Inside the mixing chamber, wear-prone surfaces are lined with hardened alloy steel (such as Hardox or similar materials) and the mixing blades and arms are made of Ni-Hard castings or wear-resistant metal, significantly prolonging the service life of the mixer even when processing abrasive aggregates and hot bitumen. The twin shafts themselves are synchronized by a rugged drive system featuring a heavy-duty gear reducer and high-torque motors, ensuring balanced, reliable rotation under full load. This robust drive assembly provides the torque needed to move large volumes of material and maintains performance over years of intensive use.

To highlight the key engineering features that enhance durability and performance, Polygonmachine incorporates several innovations in its twin shaft mixers:

Heavy-Duty Drive System:

Each mixer is equipped with a high-quality, oversized reducer and powerful motors to deliver consistent torque for continuous mixing. This heavy-duty drive ensures reliable operation even under maximum load and contributes to the mixer’s long-term performance. The robust drive components are engineered for minimal wear and are capable of sustaining high throughput over extended periods.

Abrasion-Resistant Liners:

The interior of the mixing chamber is fitted with heat- and abrasion-resistant inner liners, which protect the body of the mixer from the continuous scouring of hot aggregates and asphalt binder. These replaceable liners (often made from hardened alloy steel) significantly reduce wear and maintenance needs, ensuring the mixer maintains its efficiency and does not suffer downtime due to component erosion.

Long-Life Mixing Arms and Blades:

Polygonmachine uses extremely durable materials for the twin shafts’ mixing arms and paddles. Ni-hard cast steel arms and paddle tips provide exceptional hardness and wear resistance, giving the mixer long service life even when handling coarse aggregates and minerals. These long-life arms and paddles are designed to retain their shape and effectiveness over countless mixing cycles, thus preserving mixing quality and reducing replacement frequency.

Efficient Discharge Mechanism:

Each twin shaft mixer features a double-valved discharge system that allows rapid and controlled release of the mixed asphalt. This dual-door design ensures that the entire batch can be emptied quickly to the waiting haul truck or storage silo, minimizing cycle times. Additionally, the discharge gate is equipped with an external electric heating element. This innovative heating prevents cooling and sticking of asphalt at the gate, ensuring smooth flow of the mix and avoiding clogs during discharge – especially important when working in colder climates or with mixes that include high percentages of reclaimed asphalt.

Easy Maintenance Design:

Polygonmachine has also engineered these mixers for ease of maintenance and minimal downtime. The mixing chamber liners and paddles are typically attached using bolted connections, allowing crews to quickly replace wear parts on-site without special tools. Regular maintenance points like lubrication are centralized or even automated – for instance, an automatic grease lubrication system can be installed to ensure bearings and seals are always properly lubricated. The overall layout provides good accessibility to all key components, so that routine inspections, cleaning, and part replacements can be performed safely and efficiently. This design philosophy of maintainability means contractors can keep the mixer running reliably with short service breaks, which is vital in paving projects on tight schedules.

Advanced Heating and Temperature Control

Within the twin shaft mixer itself, temperature control features help preserve this heat and quality of the mix. The mixing chamber’s heat-resistant liners not only withstand high temperatures, but also help minimize heat loss from the hot materials during mixing. This ensures that the asphalt remains pliable and does not begin to stiffen prematurely in the mixer. Moreover, Polygonmachine includes temperature monitoring sensors as part of the mixer’s control system, measuring the input and output mix temperatures in real time. Operators can monitor these temperature readouts on the control panel to verify that the asphalt mix is within the specified temperature range, and adjustments can be made (for example, altering burner intensity or mix time) if the mix is cooling too quickly or is hotter than needed.

Seamless Integration into Asphalt Plants

Polygonmachine’s twin shaft mixers are designed as integral components of asphalt plants, engineered for seamless integration whether in a stationary batch plant or a mobile asphalt setup. The mixers come in a range of capacities and configurations so they can be matched to various plant sizes – from relatively small 60–80 TPH (tons per hour) batch plants up to high-capacity 240+ TPH facilities. Thanks to a modular design approach, these mixers can be installed with relative ease.

Mounting and alignment within the plant tower are straightforward, aided by a bolted structure that allows each module (mixer, weighing hopper, etc.) to be assembled and aligned on-site without complex welding. Polygonmachine emphasizes functional designs that facilitate transportation and installation, using bolted attachments so that major components can be broken down for transport and quickly re-assembled at the new site. This is particularly beneficial for mobile or portable asphalt plants, which may need to be relocated frequently – the twin shaft mixer unit can be mounted on a chassis or framework that is moved as a single piece, then re-attached with minimal labor at the new location.

POLYGON MACHINE

Twin Shaft Asphalt Mixers