Tunnel Furnace

Technical overview

Designed around the complete thermal process.

Tunnel Furnace is a HuanYu tunnel furnaces system for continuous drying, air firing, continuous sintering, production heat treatment. Published configuration references include 800 / 700 °C configurations and Controlled atmosphere. Final selection depends on the material, workload, process window and selected configuration.

Key technical facts

• +Temperature reference: 800 / 700 °C configurations
• +Environment reference: Controlled atmosphere
• +I. Equipment Overview Chain belt tunnel furnace is a continuous air atmosphere heat treatment pipeline equipment, belonging to the mainstream category of tunnel furnace. This introduction of 800 standard models, relying on stainless steel mesh belt continuous delivery of workpieces, sectional temperature control to complete the drying, transition, high temperature sintering process, the whole process of automatic continuous production, suitable for large quantities, standardized drying and air sintering process, widely adapted to ceramics, electronic components, powder materials, metal coatings and other industries mass production heat treatment. Core uses: low-temperature dehydration, glue drying, coating curing of all kinds of workpieces; high-temperature sintering of ceramic and powder components under air atmosphere; pretreatment of parts surface, baking, degreasing and curing. II. Workflow Principle: The workpiece is placed on the feeding platform 310S stainless steel mesh belt, which is continuously transported forward at a uniform speed with the mesh belt, and then processed in a complete temperature zone: transition section: the air curtain isolates the external cold air and buffers the temperature; drying zone (1-4 temperature zone): low-temperature drying to remove moisture and solvent from the workpiece; transition temperature zone (5th temperature zone): gently heating to avoid sharp heating and cracking of the workpiece; high-temperature sintering zone (6-20 temperature zone): constant temperature sintering to complete material crystallization and densification; cooling zone: natural slow cooling first, then external air cooling and rapid cooling; discharging platform: continuous discharging of finished products to achieve 24-hour uninterrupted assembly line production. through the compressed air atmosphere,
• +The volatile water vapor and exhaust gas in the furnace are discharged through multiple sets of exhaust pipes at the top. III. Core technical parameters (Type 800) High temperature index Operating temperature: 800 ℃, conventional production temperature 700 ℃; empty furnace heating time < 120min; 20 independent temperature control zones, each zone independent K-type thermocouple temperature measurement; PID intelligent temperature control, temperature control accuracy ± 1 ℃. Conveyor belt system mesh belt material: 310S high-temperature stainless steel, width 650mm; load-bearing 100kg/m ², wire diameter 2.5mm, threading 3mm; operating speed 300 ~ 600mm/min frequency conversion stepless speed regulation, commonly used 500mm/min; furnace opening height 400mm, table height 800mm from the ground, easy to operate; entrance and exit equipped with deviation correction device, mesh belt emergency stop switch to prevent deviation, stuck material. Heating and electrical heating elements: resistance wire heating, corrosion resistance, rapid temperature rise, easy replacement; total heating power 200kW, empty furnace insulation power ≤ 120kW; power supply: three-phase five-wire AC380V ± 10%, 50Hz; heating control: solid-state relay zero-crossing trigger, partition contactor power supply, reduce power grid impact. Atmosphere and exhaust cooling Atmosphere medium: compressed air, air supply pressure 0.2~0.5MPa; 8 independent air intakes, single flow rate 10 ~ 120L/min,
• +The float flowmeter is precisely adjusted; 4 sets of Φ89mm exhaust manifolds collect the smoke from the furnace top header; cooling: 1m natural cooling section + 5m external air forced cooling section. Equipment dimensions The total length of the furnace body is 26500mm, the width is 2400mm, and the height is 1500mm; the whole machine is equipped with casters + height-adjusting feet, and the integrated milky white high-temperature plastic spray housing. Fourth, the total length of the furnace sectional structure layout is 28500mm, and the sectional function is clear: feeding platform 1000mm (feeding station) transition section 1000mm (air curtain seal) drying section 5000mm (5 temperature zones, total power 30kW) sintering section 15000mm (15 temperature zones, total power 100kW) cooling zone 6000mm (natural cooling + air cooling) discharge platform 1000mm (blanking station) Thermal insulation adopts corrosion-resistant refractory brick + insulation cotton composite structure, silicon carbide roller support mesh belt, reducing high temperature deformation. 5. Control system functions Human-computer interaction: touch screen operation, built-in multiple sets of process program storage, one-click call; real-time display of temperature, operating speed, and fault alarms in each area; support for data storage and report printing. Protect the acousto-optic alarm of breaking coupling, over-temperature, and overload; automatically cut off the heating in the single-zone over-temperature without affecting the operation of other temperature zones; protect both ends of the mesh with emergency stop and power failure.
• +Expanded communication: It can be equipped with a host computer to achieve centralized remote monitoring of multiple devices. VI. Standard configuration list of the whole machine: 1 set of 800-type chain belt tunnel furnace host; Chinese operation and maintenance manual (including electrical drawings), equipment certificate; spare wearing parts such as infrared heating pipes and solid-state relays; full set of intake, exhaust, temperature control and transmission components. 7. Equipment core advantages: continuous mass production, high production capacity: uninterrupted operation of the assembly line, different from the box-type intermittent furnace, suitable for mass industrial production; segmental accurate temperature control: independent temperature control in 20 zones, drying, heating, sintering zoning technology does not interfere with each other, high product consistency; stable air atmosphere: multi-channel adjustable intake + centralized exhaust, exhaust water vapor, volatiles, to avoid workpiece yellowing and foaming; stable and durable operation: 310S high-temperature resistant mesh belt, silicon carbide support, resistance wire heating and maintenance replacement is simple; stable frequency conversion transmission, not easy to run off; multiple protection: zone over-temperature protection, thermocouple fault alarm, mesh belt emergency stop, reduce production accidents; convenient operation: integrated whole machine with adjustable level, touch screen storage multiple sets of technology, no need to recommission.