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The damping system provides multi-level hydraulic resistance during the free descent of the fire curtain, enabling segmented speed control. In an emergency, the curtain descends under its own weight; the damping system adjusts the opening of valves in the hydraulic circuit to ensure that the curtain first closes rapidly at the stage opening and then automatically slows down and cushions its impact as it approaches the stage surface, thereby preventing damage from collision.
First-level high-speed segment: Rapidly isolate the fire source in the early stages of a fire to shorten response time.
Secondary Medium-Speed Stage: Balancing closing efficiency and stability;
Low-speed stage three: Damping is activated when the distance from the stage surface reaches approximately 2.5 meters, to prevent injury or impact on the stage surface.
The travel-direction reversing valve is linked to the lead screw-nut impact block mechanism: As the curtain descends, the drum rotates and drives the lead screw, causing the impact block to gradually activate the reversing valve in the hydraulic circuit, switching between different throttle valve passages and thereby adjusting the flow rate of the hydraulic motor, thus achieving speed grading 1.
Pull the release cable on the inside of the stage to disengage the electric motor’s brake, allowing the curtain to descend under gravity. The hydraulic damping system activates simultaneously, requiring no external power supply.
Hydraulic motor (connected to the motor’s tail end)
Third-level throttling valve (adjusts the speed of each section)
Travel Direction Valve (Automatic Switching Circuit)
Oil reservoir (to maintain stable oil pressure)
Check valve (prevents oil from flowing backward).
By adjusting the throttle valve opening to control the oil flow rate, you can customize the speed value and duration for each stage. Adding additional throttling circuits can further expand the number of available speed levels.
If the tensile force of the steel wire rope cannot overcome the hydraulic resistance, the curtain will fail to reach its designed maximum descent speed, delaying fire isolation. It is necessary to ensure that the hydraulic fluid viscosity is appropriate, the pipelines are unobstructed, and the damping force parameters are regularly verified.
Oil Condition: Regularly check the oil level in the reservoir and the cleanliness of the oil. Using low-viscosity oil can help reduce pressure loss.
Valves and Pipelines: Prevent throttling valves from becoming clogged or pipelines from leaking;
Mechanical linkage: Ensure that the lead screw-bump block mechanism operates without jamming.
Yes. The damping system features a purely mechanical-hydraulic design. Emergency descent relies entirely on gravity and hydraulic self-regulation, requiring no electrical power.
Guide rails are installed on both sides of the curtain, and fire-resistant sealing materials are added along the edges. Once lowered into place, the curtain closes tightly against the wall to form a smoke and flame isolation barrier that meets the required fire-resistance pressure differential standards.
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Headquarters:
Hebei Evo-Tech Machinery Manufacturing Co., Ltd.
Address:
No. 1 Evo-Tech Avenue, Yuanshi Economic Development Zone, Shijiazhuang City, Hebei Province
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