I. Core Working Logic: Four major links operate in a closed loop
The essence of the automatic double-door goods shower is an “intelligent air lock purification system”. Through a closed-loop process of induction control → air flow purging → interlock isolation → air circulation, it efficiently removes contaminants from the surface of goods and simultaneously blocks the air convection between the clean area and the non-clean area. The specific process is as follows:
Induction trigger stage: Contactless automatic start
Trigger mechanism: The door bodies on both sides of the equipment are equipped with 2 sets of infrared sensing probes (with a detection distance of up to 1.5 meters). When forklifts, AGVs, or goods approach the entrance by about 1 meter, the probes respond quickly (triggered within 0.5 seconds), and the sliding door is driven to open to both sides through the PLC control system.
Adaptive design: The sensing range can cover large-sized goods (width ≤3 meters, height ≤4 meters). Some models support the adjustment of sensing sensitivity to prevent false triggering of small auxiliary material vehicles or missed triggering of large goods.
Interlocking isolation stage: Blocking cross-contamination
Double-door interlock logic: It adopts an electronic electromagnetic lock interlocking design, allowing only one door to be opened at a time. When the entrance door is closed, the system automatically locks the entrance door and unlocks the air shower program. Before the air shower is completed, the exit door should be kept locked to prevent unclean air from flowing directly into the clean area.
Optional operation modes:
One-way interlock: Only allows passage from non-clean areas to clean areas, suitable for strictly controlled scenarios such as food and medicine.
Two-way interlock (one-way air shower) : Supports two-way passage, but the air shower is only activated when entering non-clean areas, saving energy.
Bidirectional interlock (bidirectional air shower) : Air shower is triggered for both directions of passage, meeting the bidirectional anti-pollution requirements of biological laboratories, etc.
Safety Assurance: Equipped with emergency stop switches (distributed at 3 points), in case of abnormal situations, both doors can be manually unlocked, and at the same time, the system will trigger an alarm prompt.
Air flow purging stage: Efficiently remove pollutants
Airflow generation and purification: Centrifugal/axial flow fans (with a total power of up to 3KW) draw in ambient air, which is then filtered through two stages: a primary filter (intercepting particles ≥5μm) and a high-efficiency filter (HEPA/ULPA, intercepting particles ≥0.3μm, with an efficiency of ≥99.97%), forming a clean airflow.
Purge design: Thirty to 40 sets of stainless steel inclined nozzles (with angles ranging from 30° to 45°) are evenly distributed on the top, both sides, and bottom of the box. They spray air at a high speed of 25 to 35m/s, achieving 360° all-round purging without blind spots. The shear force of the air flow can remove contaminants such as floating dust, fibers, and metal debris from the surface of the goods. Some rotating nozzles can adjust their angles in accordance with the direction of the goods’ movement to enhance the cleaning effect.
Air shower parameters: The air shower time can be set through the control panel (5S-99S, factory default 10-15S). The remaining time is displayed in real time on the LED screen, and it is equipped with a voice prompt system (such as “Air shower start”, “Air shower countdown 3 seconds”) to standardize the operation process.
Air circulation stage: Energy conservation and cleanliness are balanced
Circulation mode: The dusty air flow after purging is recovered through the bottom return air outlet, filtered again by the primary filter, and then mixed with part of the fresh air to enter the high-efficiency filter, forming a cycle of utilization and reducing energy consumption (applicable to non-sterile areas).
Special scenario adaptation: In scenarios such as aseptic medicine and biological laboratories, a “one-time return air + partial direct exhaust” design is adopted to prevent pollutants from circulating within the system. Some models can be connected to a VHP (vaporized hydrogen peroxide) generator. During purging, sterilization gas is released simultaneously, with a sterilization efficiency of ≥6 log and the destruction of microbial cell membranes.
Pressure difference control: The internal pressure of the material shower is higher than that of the non-clean area and lower than that of the clean area, forming an “intermediate buffer pressure difference zone”, which further prevents air backflow – for example, when entering the C-level area from the D-level area, the pressure of the material shower is between the two, ensuring that contaminated air cannot seep in the reverse direction.
Ii. Compatibility of key components with principles
The essence of the automatic double-door goods shower is an “intelligent air lock purification system”. Through a closed-loop process of induction control → air flow purging → interlock isolation → air circulation, it efficiently removes contaminants from the surface of goods and simultaneously blocks the air convection between the clean area and the non-clean area. The specific process is as follows:
Induction trigger stage: Contactless automatic start
Trigger mechanism: The door bodies on both sides of the equipment are equipped with 2 sets of infrared sensing probes (with a detection distance of up to 1.5 meters). When forklifts, AGVs, or goods approach the entrance by about 1 meter, the probes respond quickly (triggered within 0.5 seconds), and the sliding door is driven to open to both sides through the PLC control system.
Adaptive design: The sensing range can cover large-sized goods (width ≤3 meters, height ≤4 meters). Some models support the adjustment of sensing sensitivity to prevent false triggering of small auxiliary material vehicles or missed triggering of large goods.
Interlocking isolation stage: Blocking cross-contamination
Double-door interlock logic: It adopts an electronic electromagnetic lock interlocking design, allowing only one door to be opened at a time. When the entrance door is closed, the system automatically locks the entrance door and unlocks the air shower program. Before the air shower is completed, the exit door should be kept locked to prevent unclean air from flowing directly into the clean area.
Optional operation modes:
One-way interlock: Only allows passage from non-clean areas to clean areas, suitable for strictly controlled scenarios such as food and medicine.
Two-way interlock (one-way air shower) : Supports two-way passage, but the air shower is only activated when entering non-clean areas, saving energy.
Bidirectional interlock (bidirectional air shower) : Air shower is triggered for both directions of passage, meeting the bidirectional anti-pollution requirements of biological laboratories, etc.
Safety Assurance: Equipped with emergency stop switches (distributed at 3 points), in case of abnormal situations, both doors can be manually unlocked, and at the same time, the system will trigger an alarm prompt.
Air flow purging stage: Efficiently remove pollutants
Airflow generation and purification: Centrifugal/axial flow fans (with a total power of up to 3KW) draw in ambient air, which is then filtered through two stages: a primary filter (intercepting particles ≥5μm) and a high-efficiency filter (HEPA/ULPA, intercepting particles ≥0.3μm, with an efficiency of ≥99.97%), forming a clean airflow.
Purge design: Thirty to 40 sets of stainless steel inclined nozzles (with angles ranging from 30° to 45°) are evenly distributed on the top, both sides, and bottom of the box. They spray air at a high speed of 25 to 35m/s, achieving 360° all-round purging without blind spots. The shear force of the air flow can remove contaminants such as floating dust, fibers, and metal debris from the surface of the goods. Some rotating nozzles can adjust their angles in accordance with the direction of the goods’ movement to enhance the cleaning effect.
Air shower parameters: The air shower time can be set through the control panel (5S-99S, factory default 10-15S). The remaining time is displayed in real time on the LED screen, and it is equipped with a voice prompt system (such as “Air shower start”, “Air shower countdown 3 seconds”) to standardize the operation process.
Air circulation stage: Energy conservation and cleanliness are balanced
Circulation mode: The dusty air flow after purging is recovered through the bottom return air outlet, filtered again by the primary filter, and then mixed with part of the fresh air to enter the high-efficiency filter, forming a cycle of utilization and reducing energy consumption (applicable to non-sterile areas).
Special scenario adaptation: In scenarios such as aseptic medicine and biological laboratories, a “one-time return air + partial direct exhaust” design is adopted to prevent pollutants from circulating within the system. Some models can be connected to a VHP (vaporized hydrogen peroxide) generator. During purging, sterilization gas is released simultaneously, with a sterilization efficiency of ≥6 log and the destruction of microbial cell membranes.
Pressure difference control: The internal pressure of the material shower is higher than that of the non-clean area and lower than that of the clean area, forming an “intermediate buffer pressure difference zone”, which further prevents air backflow – for example, when entering the C-level area from the D-level area, the pressure of the material shower is between the two, ensuring that contaminated air cannot seep in the reverse direction.
Ii. Compatibility of key components with principles
| Core component | Technical principle |
Function and role |
| Infrared sensor | Infrared light reflection detection technology | Quickly identify the location of the goods, trigger the door opening and air shower program, and operate contactless to improve efficiency |
| PLC control system | Integrated circuit logical operations | Coordinate the door body opening and closing, air shower time, and interlock status, and support parameter customization and self-checking for faults |
| Primary and high-efficiency filters | Inertial collision, Brownian motion interception | Classify and purify the air to ensure that the cleanliness of the purging airflow meets the ISO 5-7 grade standards |
| High-speed fan + nozzle set | The principle of jet in fluid mechanics | High-pressure and high-speed airflow is generated, and full-dimensional purging is achieved through the design of nozzle angles |
| Sliding door + electromagnetic lock | Motor drive + electromagnetic adsorption | It can open and close the door quickly in 0.5 seconds, with excellent sealing performance. The air leakage rate is reduced by more than 50% compared with manual doors |
Iii. Core Principle: Why Can It Adapt to the Demands of Multiple Industries?
Controllable cleanliness: By adjusting the filter grade (HEPA/ULPA) and air velocity, it can adapt to the requirements of different clean areas at ISO 5-7 levels, meeting industry standards such as GB 14881 for food and GMP for pharmaceuticals.
Zero residue pollution: The contaminants after purging are recovered and filtered along with the airflow, without re-adhering to the goods, and at the same time, prevent the air in the clean area from being contaminated.
Automation adaptation: No manual operation is required throughout the process. It is compatible with continuous operation of logistics equipment such as forklifts and AGVs, improving the efficiency of workshop circulation.
Safety and compliance: Interlock design, high-efficiency filtration, materials (304 stainless steel), etc. all meet industry compliance requirements and support CE and ISO 9001 certifications.
