What Is a Belt-Type Quenching Furnace?

A belt-type quenching furnace is a continuous heat treatment equipment designed for large-batch, standardized metal parts (e.g., automotive fasteners, bearing rollers, hardware tools). Unlike batch-type furnaces (e.g., well-type furnaces), it uses a high-temperature resistant mesh belt to transport parts through sequential heating, quenching, and cooling zones-eliminating downtime for loading/unloading and ensuring consistent part quality.

Main Size Parameters

Model	Total gross output power	Total length (m)		Quench size (not including the feed table)			After-heat furnace size (excluding the feed platform)
	(KW)	Carburizing	Tempering	Network width	Net belt heating	Furnace Length	Network width	Net belt heating	Furnace Length
	(KW)	Carburizing	Tempering	Network width	Length	Furnace Length	Network width	Length	Furnace Length
TE-QM-E-1	220	28.5	30.5	400	3.5	4	600	3.5	4
TE-QM-E-2	400	32.5	34.5	600	5.5	6	800	5.5	6
TE-QM-E-3	450	36.5	38.5	600	7.5	8	800	7.5	8
TE-QM-E-4	550	36.5	38.5	800	7.5	8	1000	7.5	8
TE-QM-E-5	650	40.5	42.5	800	9.5	10	1000	9.5	10
TE-QM-G-6	76000KCAL/1H	44.5	46.5	1000	11.5	12	1200	11.5	12
	100KW
TE-QM-G-7	1250000KCAL/1H	49	57	1200	12.5	13	1400	12.5	13
	110KW
Note: When the tempering furnace is equipped with the gas blackening process, the length of the furnace body increases by 2 meters.

Product Specifications

Model	Carburizing monthly output (ton)	Tempering monthly output (tonnes)	Carburizing yield per hour (kg)	Tempering hourly output (kg)
TE-QM-E-1	58	115	80	160
TE-QM-E-2	190	270	270	380
TE-QM-E-3	210	290	300	410
TE-QM-E-4	340	440	480	620
TE-QM-E-5	540	610	760	860
TE-QM-6-G	670	790	940	1100
TE-QM-7-G	1000	1200	1380	1600

Device construction

1. Energy-Saving Mesh Belt Design
The mesh belt is supported by idlers and designed for superimposed operation in the preheating zone. The heat from the lower mesh belt is transferred to the upper belt and workpieces, effectively saving energy and reducing furnace temperature drop. Additionally, the reduced furnace door opening minimizes raw material gas consumption. The mesh belt drive combines in-furnace idler following with external rolling rollers, ensuring smooth operation without crawling, while roller adjustments allow easy correction of belt deviation.

2. Stable Furnace Zoning and Radiant Heating
Each zone in the furnace is separated by arch bricks at the top, maintaining temperature uniformity and stable atmosphere conditions for reliable heat treatment quality. Centrifugal casting radiant tubes are applied, each zone powered by an independent isolation step-down transformer for safety. The radiant tubes are connected in parallel, allowing replacement without shutting down the furnace, thus ensuring uninterrupted production and long service life.

3. Excellent Sealing and Temperature Control
The furnace structure provides excellent airtightness, with no gas leakage except at the door and oil fume discharge port, reducing fuel consumption and ensuring energy efficiency. Heating elements at the blanking port are carefully arranged to maintain the quenching temperature of workpieces, while an infrared temperature detection port enables real-time inspection of workpiece temperature before oil quenching, improving process control.

4. Efficient Oil Fume Exhaust and Atmosphere Protection
At the rear of the furnace, a micro fan generates a negative pressure difference to exhaust oil fumes beneath the oil curtain. This prevents interference with the furnace atmosphere, reduces carbon black formation, and avoids unnecessary gas waste from direct exhaust. The design ensures both environmental protection and stable furnace conditions.

5. Advanced Quenching and Cleaning System
The quenching oil tank adopts a combined mode of liquid surface jet flow and impeller stirring, ensuring full convection and consistent quenching conditions for uniform workpiece hardness. Supporting cleaning machines are designed with a double-tank structure, additional cleaning nozzles, and extended cleaning time for improved results. For products requiring dephosphorization, the first tank can be filled with dephosphorization liquid to combine cleaning and dephosphorization functions.

Safety device

Temperature Safety Control

Special thermometers and thermocouples are installed on the heating furnace to prevent overheating and to stop dripping at low temperatures, ensuring stable operation and process reliability.

Mesh Belt Monitoring and Protection

A rotary detection device with an action detection circuit is used to monitor the operation status of the mesh belt and issue alarms when necessary. In addition, a torque limiter provides safety protection against overload, preventing belt damage.

Abnormal Height Alarm

At the front entrance of the heating furnace, a contact sensor detects abnormal transport height of workpieces. When triggered, it issues an alarm and automatically stops the preceding equipment to avoid accidents.

Interlock Safety Devices

Various interlock mechanisms are integrated into the system to prevent equipment damage and enhance overall safety during operation.

Atmosphere control

In the methanol-propane composite atmosphere system, the staged process of off-furnace gasification and in-furnace full cracking not only increases methanol cracking efficiency to over 95% (compared to approximately 80% for conventional direct in-furnace gasification and cracking), but also reduces methanol consumption per workpiece by 15%-20%. It also prevents incompletely cracked methanol vapor from condensing and forming carbon deposits in the low-temperature furnace section, reduces carbon scale adhesion on heating elements and mesh belts, and extends spare part replacement cycles by approximately 30%.

The dual-zone temperature control design of the dual oxygen probe (one for the heating and one for the insulation sections) enables real-time control of the oxygen partial pressure in both sections to an accuracy of ±0.05% O₂. Even for mixed production lines of automotive high-strength bolts (carburized layer requirement of 0.3-0.8mm) and aviation fasteners (carburized layer requirement of 0.5-1.2mm), the dynamic adjustment of the two-zone atmosphere concentration ensures a carburized layer hardness gradient deviation of ≤0.3HRC for different workpieces, fully adapting to the flexible processing requirements of diverse product categories on continuous production lines.

Application

1. Application Scope
The mesh belt furnace is suitable for the heat treatment of various fasteners and other special parts of appropriate size and weight. Its process range includes quenching, tempering (with optional gas DX blackening), carburizing, quenching and tempering, and other related processes.

2. Process Characteristics
Based on the characteristics of this furnace, the thin-layer carburizing process is the most applicable. A carburizing layer of less than 0.30mm is recommended as the most suitable.

3. Process Limitations
It is advised to avoid using the carbonitriding (cyaniding) process as much as possible, since it may shorten the service life of the mesh belt and radiant tubes.

4. Workpiece Considerations
Light, thin plate-shaped workpieces may overlap and adhere during processing, leading to unsatisfactory results or even being "lost." Unless proper preventive measures are taken, such workpieces are not recommended for production in this furnace.

Customized Options and Services

Expandable upon request:

Atmosphere control module (methanol cracking gas/nitrogen protection);

Mesh belt material upgrade (Inconel alloy for high-temperature operation);

Online hardness testing and data traceability system.

A 12-month warranty on core components, a localized spare parts inventory, and process commissioning guidance are provided to ensure rapid commissioning.

As a core equipment for continuous heat treatment, the belt quenching furnace, with its core competitiveness of "batch stabilization + process intelligence," is particularly well-suited for the large-scale production needs of the automotive and machinery industries. It complements pit-type furnaces in both "high-volume continuous processing" and "precision processing of large parts."

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FAQ:

1. How does the furnace adapt to varying production demands, and can it integrate with existing production lines?

The furnace's modular design enables flexible capacity adjustment through a stepless speed motor (0.5–5m/min belt speed) and customizable mesh belt widths (450–1000mm). For example, when processing small automotive fasteners, the 500kg/h output can be scaled up to 2000kg/h for larger batches by optimizing belt speed and heating power synchronization . It supports seamless integration with upstream cleaning machines and downstream tempering furnaces via standardized interface protocols, forming an automated "loading-quenching-tempering-unloading" workflow. The water-cooled belt return channel prevents atmosphere leakage, ensuring compatibility with continuous production environments .

2. Can the furnace be customized for specialty materials and how long is the lead time?

Customization capabilities cover:
Material-specific processes: High-temperature models (up to 1000°C) with Inconel alloy belts for heat-resistant alloys, and methanol 裂解 gas/nitrogen protection systems for stainless steel oxidation prevention ;
Atmosphere control: Dual oxygen probes for carburizing processes, ensuring carbon potential stability (±0.05%C) for aerospace components ;
Automation upgrades: Inline hardness testing (Ra≤1.6μm accuracy) and Industry 4.0 data logging integration.
Typical lead time for standard configurations is 8–10 weeks, with custom solutions (e.g., salt bath quenching modules) requiring 12–16 weeks, including factory acceptance testing (FAT) and on-site commissioning.

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