JWZL-928 Vertical Biomass Pellet Mill | Kingwood

JWZL-928 Technical Specifications

The JWZL-928 is Kingwood’s largest vertical ring die pellet mill in the standard JWZL series, rated at 6–8 t/h and engineered for continuous-duty industrial biomass pellet production. Below are the full technical parameters:

Parameter	Specification
Main Motor Power	315KW – 8-pole
Material Shifting Motor	3KW
Cooling Oil Pump	1.5KW
Pneumatic Grease System	YGP-A
Reduction Gearbox	JWKJ600-315-8.8
Gear Oil Grade	L-CKC220
Ring Die	928mm × 76mm × 2
Roller Shell	372mm × 81mm × 3
Capacity	6–8 t/h
Machine Dimensions	3,500mm × 2,300mm × 2,500mm
Base Footprint	3,100mm × 2,080mm × 2,350mm
Machine Weight	18 metric tons
Pellet Formation Rate	≥97%
Pellet Pulverization Rate	≤3%
Noise Level	≤93 dB(A)

The machine weighs 18 metric tons and is designed for permanent installation within an enclosed, dust-managed production facility — consistent with Kingwood’s Three-Standardization Framework for integrated, dust-free, and automated pellet lines.

Drive System, Structural Design, and Mechanical Reliability

The JWZL-928 prioritizes long-interval operation with minimal unplanned downtime through several interdependent mechanical design decisions.

Gearbox and gear train. The base-mounted JWKJ600-315-8.8 reduction gearbox positions the drivetrain at a low center of gravity, reducing vibration transmission to the ring die assembly. All gears are forged from 20CrMnTi alloy steel and finished with precision-ground hard-tooth surfaces. This material and process combination supports high-load continuous operation while keeping transmission noise within the ≤93 dB(A) specification.

Motor configuration. The 315KW 8-pole motor delivers high torque at low rotational speed. Compared to higher-pole-count alternatives, this configuration generates less heat per unit of torque, which directly extends winding and bearing service life. The motor connects to the gearbox via a compensating nylon pin coupling, which absorbs minor shaft misalignment and mechanical shock loads that would otherwise transmit into the gearbox input shaft.

Sealing. All critical rotating interfaces use imported fluororubber oil seals, selected for their resistance to both petroleum-based lubricants (L-CKC220 gear oil) and the elevated temperatures common at the ring die interface.

Thermal management. A water-cooled oil heat exchanger, backed by an external oil cooling circuit, keeps gearbox oil temperature within the operating range of L-CKC220 gear oil regardless of ambient conditions. This is particularly relevant for facilities operating in high-temperature climates or running extended production shifts.

Feeding, Monitoring, and Operational Control

Feeding system. The JWZL-928 uses a top-down gravity feed with a mechanical distributor that spreads incoming material evenly across the ring die surface. Even distribution is critical at 6–8 t/h throughput: uneven feeding creates differential wear across roller shells and causes pellet density variation. The distributor design accommodates mixed-moisture or mixed-species biomass feedstocks without manual adjustment between batches.

Intelligent monitoring. Real-time sensors track temperature at the main motor, gearbox bearings, and ring die bearing housings. Main shaft lubrication status is monitored continuously. When any parameter exceeds the configured threshold, the control system flags the condition before it reaches failure state. For production managers running multi-shift operations, this eliminates the reliance on scheduled manual checks as the primary failure-prevention mechanism.

Discharge system. The lower rotary support discharge mechanism provides consistent pellet exit flow and is engineered for component-level disassembly — meaning roller shells and discharge parts can be replaced without removing the entire lower assembly from the machine frame.

Energy efficiency. The permanent magnet servo motor option reduces energy draw by 10–15% relative to standard induction motors at equivalent output. At 6–8 t/h and multi-shift daily operation, this represents a measurable reduction in per-ton energy cost over the equipment’s operating life.

Integration into Industrial Biomass Pellet Production Lines

The JWZL-928 is engineered to function as the pelletizing stage within a complete wet-feed biomass pellet production line. Kingwood’s complete lines handle feedstock from initial crushing through drum chipping, drum drying, fine grinding, pelletizing, counter-flow cooling, and automated packaging — with fully enclosed processing and integrated dust removal throughout.

For buyers evaluating the JWZL-928 in a wholesale or full-line context: the machine’s 18-ton structural mass, 315KW electrical draw, and 3,500mm × 2,300mm footprint require civil foundation planning and dedicated electrical supply sizing before installation. Kingwood’s engineering team provides complete line layout documentation and utility specification sheets as part of the project design package.

The JWZL-928 is the capacity step above the JWZL-688D (3–3.5 t/h) and is frequently deployed in projects requiring 6–8 t/h per pellet mill unit, with multiple units running in parallel for lines exceeding 10 t/h. For a documented example of a high-throughput configuration, see the 24 t/h Vietnam wood chip pellet production line case study.

Kingwood — Jiangsu Kingwood Industrial Co., Ltd., NEEQ-listed (stock code: 871765), founded 1999 — has been supplying industrial pellet mill equipment to buyers across 30 countries for over 27 years. All equipment is manufactured at the company’s 25,000 m² production facility in Liyang Zhongguancun Industrial Park, Jiangsu Province, China.