Detailed Specification of 20m-Long × 1m-Wide Tunnel Drying Oven (Effective Oven Length: 18m)

This specification document provides a comprehensive analysis of the THL-2010 tunnel drying oven. Featuring core dimensional characteristics of "20m total length, 18m effective oven length, and 1000mm internal width", the equipment adopts a modular design and an intelligent control system, which can meet the continuous drying needs in various fields such as food processing, hardware coating, and electronic component curing. Its structural design not only balances the stability and efficiency of large-sized equipment but also realizes customized drying of different materials through precise parameter adjustment, making it a core supporting equipment for medium and large production lines.

I. Core Technical Parameters

Equipment parameters are the core basis for reflecting its performance and application scenarios. The key parameters of this type of tunnel drying oven have been optimized through multiple rounds of working condition tests to ensure that while meeting the needs of large-sized processing, it also takes into account energy consumption and precision control:

II. Structural Design Based on Dimensional Characteristics

The structural design of this equipment takes "20m total length, 18m effective oven length, and 1000mm internal width" as the core constraints. While ensuring structural stability, it maximizes drying efficiency and uniformity. The design of each core system is as follows:

1. Tunnel Body and Frame: Stability Guarantee for Large Size

The tunnel body adopts a segmented modular structure, with each segment being 2m long. A total of 10 segments are spliced to form a total length of 20m, among which segments 1-9 are heating working sections (18m effective oven length), and the 10th segment is a cooling transition section. The oven shell is welded with 3mm-thick Q235 steel plates, the inner wall is made of 1.5mm-thick 304 stainless steel plates, and the middle is filled with 100mm-thick aluminum silicate insulation cotton, which has excellent thermal insulation performance. The external surface temperature of the oven is ≤45℃ (at an ambient temperature of 25℃), effectively reducing energy consumption.

As the "load-bearing skeleton" of the large-sized equipment, the frame is welded with 16# I-steel and 8# channel steel. A set of load-bearing columns is arranged every 2m, and 16 adjustable anchor bolts (diameter φ30mm) are equipped at the bottom. The levelness of the oven body can be calibrated with a level, and the error is controlled within 0.5mm/m to avoid conveying deviation caused by the large length-diameter ratio of the equipment. Shock-absorbing pads are also added at the bottom of the frame to reduce vibration transmission during operation and protect the workshop floor and surrounding equipment.

Aiming at the 1000mm internal width design, each segment on the side of the oven body is equipped with a double-opening access door (size: 800mm × 600mm), and a long strip observation window (1000mm × 150mm) is set on the top. High-temperature resistant quartz glass is used, which is convenient for operators to monitor the drying status of wide-width materials from multiple angles and provides sufficient space for equipment maintenance.

2. Conveying System: Adaptive Optimization for Wide Width and Long Distance

Combined with the 1000mm internal width and 18m long drying path, the conveying system provides two configuration options to adapt to different material characteristics:

• Mesh Belt Conveying (for light and thin materials): A 1000mm-wide 304 stainless steel mesh belt is adopted, with mesh size of φ2 × 5mm and wire diameter of 1.2mm. Its tensile strength is ≥50MPa, which can prevent the wide-width mesh belt from loosening or deviating during 18m long-distance operation. The driving end of the mesh belt is equipped with double sprockets for synchronous transmission, and a tensioning device is used to adjust the mesh belt tension in real-time. The conveying speed is controlled by an 11kW variable frequency motor, with an adjustment precision of 0.1m/min, ensuring that the residence time of materials in the 18m-long oven is accurately controllable.

• Chain Plate Conveying (for heavy workpieces): Composed of 1000mm-wide stainless steel chain plates spliced together, the chain plate thickness is 3mm, and each chain plate is reinforced with stiffeners, increasing the load capacity to 100kg/㎡. The conveying mechanism adopts a modular chain link design, which is convenient for replacing and maintaining individual chain plates. The driving system uses a 15kW reducer motor to ensure stable operation even when carrying heavy materials and avoid jamming during long-distance conveying.

Both conveying methods are equipped with guide plates at the inlet and outlet. The inlet guide plate can adjust the angle to guide materials to accurately enter the center of the conveying surface, avoiding the deviation of wide-width materials in the 1000mm width direction and ensuring drying uniformity.

3. Heating System: Uniform Temperature Control Scheme for Long Ovens

To meet the heating needs of the 18m effective oven length, this equipment adopts a "sectional heating + multi-point temperature measurement" design to ensure uniform temperature inside the oven:

The electric heating version is divided into 5 heating sections (3.6m per section) within the 18m effective oven length. Each section is equipped with 6 φ50mm stainless steel heating tubes on the top and both sides, with a single power of 2kW, and each section independently controls the power output. The temperature sensor adopts PT100 platinum resistor, and 2 temperature measurement points (one at the front and one at the back) are set in each section to collect the temperature data inside the oven in real-time and feed it back to the controller, realizing independent temperature adjustment of each section and solving the "front-back temperature difference" problem that is prone to occur in long ovens.

The gas heating version is equipped with low-nitrogen burners (NOx emission ≤30mg/m³) on the side of each section of the oven body. Hot air is introduced into the oven through a heat exchanger, and each section is equipped with an independent air volume control valve to adjust the hot air input. The heat exchanger adopts a finned structure to increase the heat exchange area, ensuring that the hot air in the 1000mm-wide oven can be evenly distributed and avoiding the difference in drying effect on both sides of the wide-width materials.

Regardless of the heating method, a temperature compensation device is installed at the end of the heating section. When the outlet temperature is detected to be lower than the set value, the heating power of the final section is automatically increased to ensure that the materials meet the drying requirements when leaving the oven.

4. Hot Air Circulation and Exhaust: Airflow Control in Large Space

To solve the airflow circulation problem in the 18m-long and 1000mm-wide oven, the equipment adopts a "top supply and bottom suction + multi-fan coordination" hot air circulation system: one centrifugal fan (power 1.5kW, air volume 1500m³/h) is installed on the top of each 2m-long oven body, and a total of 9 fans work together to blow the heated hot air evenly from the top to the conveying surface. Corresponding air return outlets are set at the bottom of the oven body to form an airflow circulation path of "top supply and bottom suction". The airflow speed is controlled at about 2m/s to ensure that the hot air can penetrate the thick-layer materials or cover the surface of the wide-width materials.

The exhaust system is equipped with 4 exhaust outlets (each with a diameter of φ150mm) on the top of sections 6-9 of the oven body (i.e., the late drying stage), which are equipped with electric control valves, and the total exhaust volume can reach 1200m³/h. The exhaust outlets are designed in the late drying stage, which can not only promptly discharge the moisture evaporated from the materials but also avoid energy waste caused by early discharge of hot air. For materials containing volatile organic compounds (VOCs), the exhaust outlets can be directly connected to activated carbon adsorption devices or catalytic combustion equipment to meet environmental protection requirements.

5. Control System: Full-Process Intelligent Management and Control

Based on the large size of the equipment and the multi-section control requirements, the control system adopts a PLC + touch screen architecture to realize full-process automatic management and control: the touch screen is a 10-inch industrial touch screen, and the interface clearly displays the real-time temperature of 5 heating sections, conveying speed, fan operation status and other parameters. Operators can set the target temperature of each section (50-300℃), conveying speed (0.5-5m/min) and exhaust volume through the interface, with the parameter setting precision reaching 0.1℃ and 0.1m/min.

The system has a variety of intelligent functions: first, the data storage function, which can record the operating parameters within 3 months and support batch query and export; second, the fault alarm function, which immediately issues an acousto-optic alarm and displays the fault location on the touch screen when the temperature of a certain section exceeds the standard (±5℃), conveying jams or fan failures occur; third, the linkage control function, which automatically starts the heating system and conveying system when the inlet material detection device (optional) detects materials, and automatically enters the heat preservation standby state when there are no materials, reducing energy consumption.

III. Performance Advantages and Application Scenarios

1. Core Performance Advantages

• Efficient Drying Capacity: The 18m effective oven length extends the contact time between materials and hot air. Combined with the 2m/s hot air circulation speed, for materials with a water content of 20%, the water content after drying can be reduced to below 0.5%, and the drying efficiency is 40% higher than that of equipment with a 10m oven length.

• Wide Width Adaptability: The 1000mm internal width supports the simultaneous drying of a single wide-width material (such as 1000mm × 2000mm coated plates) or 5 rows of parallel small materials (such as φ200mm hardware parts), improving production efficiency.

• Stability and Energy Saving: The sectional heating and precise temperature control design ensure that the temperature uniformity inside the oven is ≤±2℃, avoiding energy waste caused by local overheating; the insulation layer design reduces the heat loss rate to ≤5%, saving 15%-20% energy compared with traditional equipment.

• Easy Operation: The modular structure is convenient for transportation and installation. The 18m oven body can be disassembled into 10 segments for transportation to the site for splicing, and the installation period is only 3-5 days; the intelligent control system reduces manual intervention, and a single person can complete the equipment operation and monitoring.

2. Typical Application Scenarios

With its large size and precise temperature control, this equipment is widely suitable for the following production scenarios:

• Hardware Coating Industry: Used for post-coating curing of 1000mm-wide steel plates, aluminum alloy profiles and other workpieces. The 18m oven length ensures sufficient curing of the coating, improves adhesion, and avoids defects such as sagging and pinholes.

• Food Processing Industry: Used for continuous baking of biscuits, pastries and other foods, or drying of dehydrated vegetables and Chinese medicinal materials. The wide conveying surface supports batch production, and precise temperature control ensures food taste and nutrition.

• Electronic Component Industry: Used for solder curing or moisture-proof drying of LED lamp beads, circuit boards and other components. Sectional temperature control avoids component damage caused by high temperature, and the 18m oven length ensures sufficient curing.

• Building Materials Industry: Used for drying the surface glaze of small building materials such as ceramic tiles and mosaics. The 1000mm width can support multi-row parallel conveying of ceramic tiles, improving the production capacity of the production line.

IV. Installation and Maintenance Points

1. Installation Requirements

The equipment installation requires a flat ground of 20m × 2m, and the ground load-bearing capacity should be ≥10kN/㎡ to avoid oven deformation caused by ground settlement; during installation, the levelness error of the oven body should be ensured to be ≤0.5mm/m, and the height difference between the conveying surface and the front and rear production lines should be ≤2mm; the electrical installation requires an independent 380V three-phase five-wire power supply system, and the grounding resistance should be ≤4Ω; the gas version needs to be connected to a gas pipeline that meets the pressure requirements, and a leak detection device should be installed.

2. Daily Maintenance

• Daily check the tension and cleanliness of the conveying mesh belt/chain plate, and remove residual materials on the surface to avoid jamming;

• Weekly check the working status of the heating tubes/burners, and clean the dust on the surface to ensure heating efficiency;

• Monthly calibrate the temperature sensor and pressure gauge, check whether the insulation layer is damaged, and replace aging components in time;

• Quarterly lubricate the rotating parts such as fans and motors, and check the tightness of the anchor bolts to prevent loosening.

Through precise dimensional design and system optimization, this type of tunnel drying oven not only meets the batch drying needs of medium and large-scale production but also reduces operating costs through intelligent control and energy-saving design, making it an ideal equipment that balances efficiency, quality and economy. Users can customize and adjust the heating method, conveying type and internal height according to specific material characteristics and production scale