Rongjida HWJ-15 Horizontal Mortar Mixer
| Brand | Rongjida Instruments |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Region of Origin | Domestic (China) |
| Model | HWJ-15 |
| Price | USD 560 (FOB Shanghai) |
| Test Type | Mixing Performance & Homogeneity Validation |
| Loading Capacity | 18 L |
| Discharge Capacity | 15 L |
| Maximum Discharge Capacity | 20 L |
| Homogenization Time | ≤45 s |
| Mixing Shaft Speed | 45 rpm |
| Power Supply | 380 V AC, 1.5 kW |
| Dimensions (L×W×H) | 1130 × 400 × 900 mm |
| Net Weight | 110 kg |
Overview
The Rongjida HWJ-15 Horizontal Mortar Mixer is an engineered laboratory-scale mixing system designed for reproducible, high-fidelity preparation of dry-mix mortars, cementitious composites, and pre-blended construction materials. Operating on a horizontal-axis planetary-rotational principle, the unit utilizes a fixed-speed gear-driven drum with internal paddles to ensure uniform shear distribution and particle dispersion across heterogeneous powder–liquid or powder–powder systems. Unlike vertical mixers, its horizontal configuration minimizes air entrapment and segregation during batch processing—critical for ASTM C305-compliant mortar preparation and EN 196-1 standard compliance in cement testing laboratories. The mixer serves as a primary sample conditioning tool prior to rheological assessment, compressive strength testing (per ISO 679), or flow table analysis, and is widely deployed in R&D labs of building material manufacturers, third-party certification bodies, and university civil engineering departments.
Key Features
- Robust cast-iron frame and reinforced steel drum housing engineered for long-term mechanical stability under repetitive loading cycles
- Direct-coupled 1.5 kW three-phase motor with integrated thermal overload protection and IP54-rated enclosure
- Optimized gear-and-ring transmission system eliminating slippage between drum and support rollers—even under high-humidity or condensation-prone ambient conditions
- Adjustable time relay (0–120 s range) enabling precise control over mixing duration to meet standardized test protocols
- Lockable drum positioning mechanism with manual worm-gear assisted tilt for controlled, gravity-assisted discharge at angles up to 90°
- Sealed lubrication points at worm gear reducer, sliding bearings, and drive shaft supports—requiring only periodic oil replenishment per maintenance schedule
- CE-marked electrical cabinet with phase-reversal safeguard; motor wiring accommodates standard industrial 380 V / 50 Hz supply without external transformers
Sample Compatibility & Compliance
The HWJ-15 accommodates a broad spectrum of construction-related formulations, including but not limited to: Portland cement-based dry mortars, polymer-modified tile adhesives, self-leveling underlayments, grouts, and lightweight aerated concrete pre-blends. Its 15 L nominal discharge volume aligns with ASTM C109/C109M mortar cube casting requirements and EN 1015-2 standard mixing procedures. All structural components comply with GB/T 13306-2011 (Chinese national standard for labeling of industrial equipment) and incorporate corrosion-resistant surface treatments suitable for alkaline material exposure. While not certified to UL or ATEX standards, the unit meets general-purpose lab safety guidelines per IEC 61000-6-2/6-4 for electromagnetic compatibility and mechanical safety per ISO 12100.
Software & Data Management
The HWJ-15 operates as a standalone electromechanical instrument with no embedded microprocessor or digital interface. Mixing parameters—including runtime, direction, and power-on status—are manually set and verified via analog controls (mechanical timer, toggle switch, position lock lever). For traceability in GLP or ISO/IEC 17025-accredited environments, users are advised to record operational logs in laboratory notebooks or LIMS-integrated spreadsheets, noting batch ID, start/stop timestamps, observed homogeneity indicators (e.g., visual consistency, absence of streaking), and post-mixing temperature rise (<2°C typical). No firmware updates, remote diagnostics, or audit trail functionality are provided—consistent with its classification as a Class I laboratory auxiliary device under FDA 21 CFR Part 11 definitions.
Applications
- Preparation of standardized mortar specimens for compressive strength (ISO 679, ASTM C109), flexural strength (EN 1015-11), and water retention testing
- Homogenization of proprietary dry blends prior to particle size distribution analysis (laser diffraction) or XRD phase quantification
- QC/QA batch verification in pre-mixed adhesive and grout manufacturing facilities
- Teaching laboratories demonstrating aggregate–binder interaction kinetics and hydration onset behavior
- Calibration support for automated flow tables (ASTM C1437) and mini-slump testers
FAQ
What is the recommended maintenance interval for the gear reducer oil?
Oil should be replaced after the first 50 operating hours, then every 500 hours or semiannually—whichever occurs sooner—using ISO VG 220 mineral gear oil.
Can the mixer handle wet-mix concrete with coarse aggregate up to 8 mm?
No. The HWJ-15 is rated exclusively for fine-grained dry or semi-dry mixes; coarse aggregates exceed design clearance tolerances and risk jamming the paddle-drum interface.
Is the drum rotation reversible?
No. Rotation direction is fixed at manufacture and must match incoming power phase sequence; reversal requires physical rewiring of motor leads.
Does the unit include a dust collection port or fume extraction interface?
No. It is not equipped with ventilation ports or ducting adapters; users must implement external local exhaust ventilation when handling silica-containing powders per OSHA 1926.1153.
What documentation accompanies shipment?
Each unit ships with a factory calibration certificate (torque and timing verification), mechanical assembly drawing, multilingual operation manual (English/Chinese), and CE Declaration of Conformity.
