Firewood Processor Product

Overview

The firewood processor is a stationary or semi-mobile machine that converts logs into stove-ready firewood in a single operation. It combines a primary bandsaw or circular saw with a large hydraulic splitting wedge and an outfeed conveyor, enabling an operator to load logs at the Log Deck and collect finished billets from the discharge end in one continuous cycle. Modern processors handle logs 150–600 mm diameter and split them into pieces suitable for residential heating.

Firewood processors are widely deployed in centralized wood-processing operations, clearing services, and biomass preparation facilities. They eliminate the need for secondary manual splitting, improving labor efficiency and safety compared to chainsaw bucking and maul splitting.

How it works

The operator loads felled logs or tree sections onto the Log Deck, an inclined 2.5 m × 1.5 m platform tilted 30° to gravity. The Feed Stop is adjusted to set the desired log length (typically 300–500 mm). Powered Log Roller driven by a hydraulic motor pull the log toward the processing zone at controlled feed speed.

As the log approaches, the operator engages the Saw Unit. The Saw Blade (bi-metal bandsaw, 60 mm wide) rotates at 1200 rpm via the Saw Motor. The operator actuates the Saw Feed proportional cylinder, driving the blade downward through the log at 500 mm/min. The blade cuts the log to the desired length in 10–20 seconds depending on diameter.

Once cut, the severed log segment falls into the splitting zone where it is caught by a support plate. The operator engages the Splitting Wedge Ram system: the Wedge Cylinder (150 mm bore, 1200 mm stroke) extends at 280 bar, driving the hardened steel Wedge Blade through the log. The wedge splits the log lengthwise, and the two halves (or more pieces if the log is large) are ejected onto the Outfeed Conveyor.

The Outfeed Conveyor is a chain-and-flight conveyor inclined 45°, powered by a Conveyor Motor at 100 rpm. The wood pieces travel up the conveyor at approximately 2 m/min and are discharged into a truck bed or pile at ground level. The entire cycle from log infeed to output takes 45–60 seconds, enabling production rates of 4–8 tonnes per hour.

The diesel Diesel Engine drives a variable displacement Hydraulic Pump, which supplies all hydraulic circuits through a Valve Manifold proportional control block. The operator controls feed speed, saw descent, wedge extension, and conveyor speed from a proportional joystick mounted on the machine frame.

Log Deck and Infeed System

The Log Deck is an inclined platform fabricated from a Deck Frame welded angle-iron frame with a Deck Plate 12 mm steel surface. The 30° incline allows logs to roll naturally downhill while remaining controllable. The Feed Stop is an adjustable gate (hydraulic or mechanical) that arrests the log when it reaches the desired length.

Two Log Roller pairs (80 mm diameter elastomer-coated) are mounted transverse to the deck, powered by a single hydraulic motor via a shaft drive. The rollers grip the log and push it downslope at controlled speed, which can be adjusted via the proportional valve. For logs greater than 300 mm diameter, the rollers automatically advance the log as the bandsaw cuts, ensuring consistent feed motion.

Saw and Splitter Subsystems

The Saw Unit uses a bi-metal bandsaw rather than a circular saw in most models, as the bandsaw delivers a narrower kerf (60 mm blade width) and lower noise than a circular blade. The Saw Blade is a 1.6 mm thick bi-metal band running at 1200 rpm via the Saw Motor, a fixed-displacement 20 cc/rev unit. The blade is guided by hardened rails in the Saw Carriage cast iron frame.

The Saw Feed is a proportional pilot-operated cylinder that drives the saw head downward at a settable rate (typically 300–600 mm/min). Lowering the feed rate reduces splinters and produces a cleaner cut surface; raising it speeds processing but increases saw wear. A mechanical depth stop limits blade travel to protect the machine.

The Splitting Wedge Ram is the critical component for log splitting. The Wedge Cylinder is a tandem-piston or single-piston arrangement rated 150 mm bore at 280 bar, producing up to 52 tonne clamp force. This is sufficient to split hardwoods (oak, ash, maple) up to 400 mm diameter in a single stroke. The Wedge Blade is a hardened tool-steel wedge with a 45° cutting angle, replacing traditional axe-like splitting.

The Split Return Spring is a heavy spring or spring-loaded return cylinder that withdraws the wedge after the log is split, resetting the machine for the next cycle. Return speed is typically 2–3 seconds, allowing cycle times of 45–60 seconds.

Outfeed and Frame

The Outfeed Conveyor is a chain-and-flight system: the Conveyor Chain is a roller chain (200 mm pitch) with welded steel flight bars that carry wood pieces up the incline. The chain runs at approximately 100 rpm via the Conveyor Motor (50 cc/rev fixed-displacement unit), translating to about 3 m/min linear speed at the chain periphery.

The conveyor is mounted on a Conveyor Frame welded angle-iron structure inclined 45° to horizontal. At the top, the wood pieces are discharged into a truck bed, log deck, or pile. A rubber deflector can be added to direct wood into tight spaces.

The main Main Frame is a welded box-section structure (300×200 mm wall 10 mm) forming a sturdy base for all subsystems. Cross-bracing members prevent lateral flexing under load. Four Leveling Foot adjustable leveling feet ensure the machine sits level on uneven ground, critical for consistent sawing and splitting.

Hydraulic System and Control

The Hydraulic Pump is a bent-axis variable displacement pump (80 cc/rev) with pressure compensation and load-check relief. It supplies all circuits at up to 280 bar through the Valve Manifold, which integrates:

• Main pressure relief
• Load-check valve
• Proportional directional valve for saw feed
• Proportional directional valve for wedge motion
• Fixed-flow spool for conveyor motor

All circuits can be operated independently or synchronized via the operator's proportional joystick. The Cooler is fan-driven and maintains oil temperature below 50°C during continuous processing.

Performance and Maintenance

A modern firewood processor handles 4–8 tonnes of logs per hour, producing finished billets ready for stacking and seasoning. Production rates depend on log diameter (smaller logs process faster) and hardwood species (hardwoods require higher splitting force and thus slower cycle times than softwoods).

Key maintenance items:

• Replace bandsaw blade every 40–80 operating hours (depending on wood species).
• Replace hydraulic fluid filter every 200 hours.
• Inspect wedge blade for dulling and sharpen or replace every 500 hours.
• Check chain tension and condition quarterly.

Models from STIHL, Posch, and Pilous are industry standards, with processing capacities ranging from 2 tonnes/hour (compact 80 kW models) to 12 tonnes/hour (large 200 kW installations).