HEM Group (HME TOP Machinery Equipment Co., Ltd.) was established in 1998 by a distinguished panel of engineering professors from Chang'an University—Asia's premier academic epicenter for highway engineering, pavement science, and mechanical design. Initially operating as Xi'an Hongda Communications Technology Co., Ltd., our organization stands as China's earliest pioneer in the independent R&D and custom fabrication of high-performance road construction machinery.
Over 25 years of continuous theoretical experimentation and field deployment have positioned HEM Group at the forefront of mechanical dynamics, engine power matching algorithms, advanced hydraulic transmission systems, and digital electronic control units (ECU). Recognized officially as a High-Tech Enterprise by the Shaanxi Provincial Department of Science and Technology in 2006, our manufacturing protocols strictly adhere to international engineering benchmarks, providing custom OEM manual bitumen sprayers and heavy maintenance equipment to over 60 countries globally.
Core Technical Authority: Grounded in Chang'an University's pavement mechanics research, our equipment bridges the gap between theoretical rheological fluid behavior and rugged field operation.
Utilizes self-priming, heavy-duty rotary gear pumps capable of delivering constant pressure (0.2–0.4 MPa) regardless of viscosity fluctuations in modified asphalt, emulsified bitumen, or heavy cutback asphalt.
Integrated automatic diesel burners coupled with high-density rock wool thermal insulation jackets keep tank temperatures stabilized between 140°C and 180°C without localized thermal degradation of asphalt binders.
Ergonomic hand-held spray lances equipped with heat-resistant quick-flushing valve loops. Features compressed air cleaning systems to instantly purge residual bitumen from nozzles post-operation.
Manual bitumen sprayers, often referred to as handheld asphalt distributors or mini bitumen sprayers, play a critical role in pavement construction where large automated spray bars cannot operate effectively. The core challenge in manual bitumen spraying lies in maintaining consistent kinematic viscosity (mm²/s) during fluid conveyance through flexible hand-wand hoses.
HEM Group’s engineering team has optimized internal flow pathways to reduce shear resistance. Our OEM designs incorporate a dual-circulating valve architecture. When spraying is temporarily suspended by the operator, the positive displacement pump shifts automatically into internal circulation mode. This maintains fluid velocity and thermal equilibrium within the tank and delivery lines, effectively preventing localized cooling and emulsion breakdown (premature breaking of cationic or anionic emulsions).
In regions across Southeast Asia, Sub-Saharan Africa, and South America, highway projects rely heavily on cost-effective maintenance equipment. OEM manual bitumen sprayers represent an essential capital expenditure due to low operational costs, ease of maintenance, and high mobility across rural road networks and municipal repair assignments.
In North America and Europe, stringent municipal standards require exact application rates for tack coats prior to overlay placement. Manual bitumen sprayers offer municipal utility crews and localized contractors surgical precision around manholes, curb gutters, bridge decks, and narrow urban alleyways where heavy machinery is impractical.
When evaluated against fully automated, truck-mounted bitumen distributors, OEM manual bitumen sprayers deliver significant economic advantages for targeted applications:
Uniform spraying of asphalt emulsion between existing pavement layers and new hot-mix asphalt (HMA) overlays to ensure structural bond integrity.
Applying low-viscosity liquid asphalt over unpaved base courses (granular materials) to seal capillary voids and prepare the base for paving.
Precise coverage of excavated trench edges and localized potholes before infilling with cold patch or hot asphalt mixtures.
Waterproofing concrete bridge decks and culverts with modified rubberized bitumen membranes prior to wear-course application.
At our 5,000 square-meter production facility, HEM Group implements rigorous quality control procedures spanning raw material procurement to final hydrostatic testing. Pressure vessels and bitumen tanks undergo automated submerged arc welding, ultrasonic flaw detection, and high-pressure leak testing to ensure absolute operational safety.
Every OEM manual bitumen sprayer leaves our factory calibrated to deliver precise spray density (L/m²). Our dedicated technical team customizes pump dimensions, engine specifications (Honda, Kohler, or diesel engines), burner capabilities, and frame geometries based on client-specific regional requirements.
Exporting to over 60 nations across Europe, Asia-Pacific, Latin America, and Africa (including Australia, India, Sri Lanka, Indonesia, Nigeria, South Africa, Ghana, Kenya, Russia, Uzbekistan, Fiji, and Bolivia).
Dedicated technical and distribution centers established in Russia, Malaysia, South Africa, Uzbekistan, Ghana, Kenya, Indonesia, and Sri Lanka to provide rapid spare parts delivery and field technical assistance.
Complete export management services including CE compliance certification, ISO9001 standards, Certificate of Origin paperwork, marine insurance, and customs clearance support.
Development of electric heating elements powered by lithium-ion battery banks to replace traditional diesel burners for indoor and urban low-emission zone (LEZ) projects.
Integrating compact digital flow rate meters and Bluetooth-enabled sensors into hand wands to provide operators with real-time feedback on L/m² application rates.
Upgrading seal materials (Viton/PTFE gaskets) and pump impellers to seamlessly handle high-percentage bio-based asphalt binders and bio-emulsions without premature degradation.
HME Machinery