DKN-LFT-0908 is the 900 mm mesh-belt specification in the Kunning Cryo liquid nitrogen quick-freezing tunnel line: mesh belt total length 8000 mm, width 900 mm, equipment external dimensions 8000 × 1750 × 1670 mm, operating temperature -150℃ ～ room temperature, temperature control accuracy ±2℃, no-load cooling 10℃ per minute, total power about 15 kW. Material enters continuously from the infeed end and is output from the discharge end after freezing, suitable for aquatic products, meat and poultry, prepared dishes and other continuous production occasions; the body can be lifted as a whole for easy cleaning.
Technical Parameters
| Item | Parameter |
|---|---|
| Structure type | Mesh-belt tunnel continuous production line, integral lifting type |
| Tunnel mesh belt size | 8000 mm (total length) × 900 mm (width) |
| Equipment external dimensions | 8000 mm (length) × 1750 mm (width) × 1670 mm (height) |
| Operating temperature | -150℃ ～ room temperature |
| Temperature control accuracy | ±2℃ |
| Cooling rate | No-load cooling 10℃ per minute (adjustable according to actual process) |
| Total power | About 15 kW |
| Power supply specification | 380V/50Hz |
| Refrigerant | 5-8 bar liquid nitrogen (liquid nitrogen storage tank self-provided) |
| Oxygen concentration detection | Setpoint 19.5% - 21.5% |
Processing capacity varies with material specifications and packaging methods; the specific configuration is determined according to customer materials and capacity.
Body Structure and Insulation
- Integral lifting body; during cleaning and maintenance the whole machine is raised, making the tunnel interior easy to clean hygienically.
- Inner and outer chambers are welded from SUS304 food-grade stainless steel plate, corrosion-resistant.
- 150 mm insulation layer is filled between inner and outer chambers to reduce cooling loss and shell condensation.
- Ultra-low-temperature sealing strips are used at cabinet connections; they do not harden at low temperatures and absorb the cold-shrinkage stress of the inner chamber.
- A water collection trench and drain pipe are provided at the bottom; the lifting system is equipped with a manual safety bolt in addition to automatic safety devices.
Mesh Belt Conveying System
- Mesh belt total length 8000 mm, width 900 mm, conveying continuously from the infeed end through to the discharge end.
- Mesh belt drive is variable-frequency speed-regulated; running speed can be adjusted according to on-site process and matched to the freezing cycle.
- Equipped with self-adaptive tensioning mechanism; remains tensioned after low-temperature shrinkage and long-term operation, reducing deviation.
- Emergency stop switches are provided at infeed and discharge positions and the electrical control cabinet; operating height is determined according to ergonomics.
Liquid Nitrogen Injection and Cooling
- Liquid nitrogen is fed from an external storage tank (user self-provided) through low-temperature piping, working pressure 5-8 bar.
- Utilizes the heat absorption of liquid nitrogen vaporization (latent heat) combined with the sensible heat of low-temperature nitrogen gas for superimposed heat exchange to lower food temperature; multiple sets of stainless steel nozzles are arranged on both upper and lower sides of the mesh belt, spraying bidirectionally onto the material.
- Low-temperature long-shaft motors are installed on top; the extended shaft extends into the tunnel, with external sealing to prevent cold air leakage; matched with nylon axial fans, not prone to frosting at low temperatures.
- Exhaust gas extraction ports are provided at infeed and discharge ends; vaporized nitrogen is centrally extracted, cooperating with on-site exhaust and oxygen concentration monitoring.
- Thinner products can be frozen within 5 minutes; specifics are confirmed according to material and target core temperature.
Control System and Safety Design
- Touch screen input, PLC intelligent control, with PID automatic adjustment; temperature and mesh belt speed are set according to process.
- PT100 platinum resistance temperature measurement, range 200℃ ～ -200℃; equipped with dual-channel sensors for main control and monitoring, with over-temperature alarm.
- One oxygen content measuring instrument at each of the infeed and discharge ends, setpoint 19.5%-21.5%, interlocked with the equipment.
- Electrical safety: grounding wire and circuit breakers complete, phase sequence protector provided to avoid wiring errors and reverse operation.
- Fool-proof input interface; exhaust can be designed to suit on-site conditions.
Applicable Scenarios and Selection Reference
| Scenario | Description |
|---|---|
| Aquatic processing | Continuous IQF of fish, shrimp, shellfish, rapid passage through the ice crystal formation zone |
| Meat and poultry processing | Continuous freezing of cut meat and poultry, connecting with upstream and downstream processes |
| Prepared dishes and ready meals | Multiple categories switched on the same line, speed and temperature set according to process |
| Central kitchen | Quick-freezing section linked with portioning and sealing processes |
For the choice between continuous lines and cabinets, see Liquid Nitrogen Quick-Freezing Tunnel; for matching mesh belt speed with freezing cycle, see Freezing Cycle and Mesh Belt Speed; for batch-type or larger single-piece materials, see Liquid Nitrogen Quick-Freezing Cabinet.
Installation Conditions
- Site: reserve operating and maintenance space according to external dimensions, leave infeed and discharge passages at both ends, and provide overhead clearance for lifting and cleaning.
- Power: 380V/50Hz, wire and ground according to total power about 15 kW and on-site distribution capacity.
- Medium: on-site liquid nitrogen storage tank and low-temperature delivery piping required (user self-provided), supply pressure 5-8 bar.
- Exhaust: exhaust gas extraction ports at infeed and discharge ends connected to exhaust piping, meeting oxygen concentration detection conditions.
Warranty and After-Sales
Whole machine warranty one year; after receiving the request, a solution is provided within 2 hours, arrival on site within 24 hours, fault elimination within 72 hours; one free on-site service per year, lifetime technical support.
Frequently Asked Questions
What output does the 900 mm mesh belt of DKN-LFT-0908 correspond to?
Processing capacity depends on single-piece weight, placement density, mesh belt speed and freezing time, and needs to be calculated according to target core temperature and hourly output.
How to understand the tunnel’s cooling rate and freezing time?
No-load cooling 10℃ per minute, adjustable according to process. Loaded time depends on material thickness and target core temperature; thinner products can be frozen within 5 minutes.
What capacity is needed for power distribution, and where does the liquid nitrogen come from?
Total power about 15 kW, power supply 380V/50Hz. Liquid nitrogen is supplied from the user’s on-site storage tank through low-temperature piping, working pressure 5-8 bar.
What are the oxygen content measuring instruments at the infeed and discharge ends for?
Liquid nitrogen vaporization produces a large amount of low-temperature nitrogen gas, which may cause local oxygen deficiency. One oxygen content measuring instrument is provided at each end of the equipment, setpoint 19.5%-21.5%, cooperating with exhaust gas extraction ports to support operational safety.
How to choose between tunnel-type and cabinet-type quick-freezing equipment?
Tunnel-type is suitable for continuous production, where cycle time connects with upstream and downstream processes; cabinet-type is suitable for batch production and larger single-piece materials.
To verify the model according to material and capacity, go to Contact Us and provide single-piece weight, target core temperature and shift output requirements; we will calculate according to parameters.