KENDRIONS shutting-speed regulators of the LINNIG brand offer a secure and compact possibility for actuation and regulation of your fire-protection closures, in line with statutory provisions.
The regulation of the shutting speed is based on an eddy current system. In this system, a copper disc as well as a steel disc behind it, are brought into rotation in front of circularly arranged permanent magnets. The poles of the permanent magnets are arranged alternatingly. The resulting eddy current in the copper disc results as a braking torque on the drive shaft.
By adjusting the air gap between the copper disc and the permanent magnets, the braking power can be changed. A smaller air gap corresponds with a higher braking torque, whereas a larger air gap leads to a reduction of the braking force. To achieve the required speed for effective operation of an eddy current system, all Kendrion shutting-speed regulators are equipped with a reduction gear with hardened gear wheels. This enables maximized service life of at least 200,000 shutting cycles to be achieved.
The gate is to be opened here manually by means of a free-wheel in the deflection pulley or in the chain wheel. As the brake is decoupled in the opening direction, merely the mass of the gate as well as the counterweight are to be moved.
Requirements on fire protection gates
Fire protection gates have the task to ensure that the fire does not interfuse through wall openings in fire-resistant or fire-proof walls. In case of fire the fire doors have to close without extra energy source. Counter weights or spring brakes trigger the closing force. According to internationally valid fire protection standards, shutting-speed regulators are applied to attain a permanent and selected shutting speed. Furthermore sliding doors/gates have to be equipped with automatically activating locking devices.In case of emergency the closing-offs at building openings have to lock automatically. Upon actuation of a locking device, a once initiated shutting procedure may be interrupted only for the purpose of protecting persons. The shutting process must automatically continue after the shutting area has been freed. All of this is achieved by our shutting-speed regulators.
Functionality of shutting-speed regulators
Shutting-speed regulators (SB) of the LINNIG brand cause a regulation of velocity for sliding doors or similarly moved masses. The door can be kept open due to the electro-magnetic locking device. If it switches off with a manual pushbutton or smoke alarm the door closes automatically. The closing occurs by a shutting weight or a feather-cable-roll which is connected by a rope with the door. The shutting speed is adjustable. The Eddy current equipment works without abrasion.
Specifications and technical data
| Max. shaft loading | 750 – 8,500 N |
|---|---|
| Max. shutting force in wire cable | 150 – 680 N |
| Voltage, holding element | 24 V |
| Max. holding torque | 8.9 – 43 Nm |
| Power rating of locking device | 2.15 - 5 W +/- 10% |
| Power rating of opening aid | 0.07 – 0.23 kW |
| Drive torque of opening aid | 20 – 45 Nm |
| Degree of protection, unit (IP) | IP 54 |
| Degree of protection, connection (IP) | IP 50 |
| Permitted braking power | 40 – 200 W |
| Permitted operating temperature range | -15 C to +40°C |
| Adjustable shutting speed | 0.08 - 0.2 m/s |
