Drives
In compliance with the general technical approval conveyor system shutters shall be self-closing. That means in the event of fire or case of failure they shall close without any extern power supply. The closing energy can be generated by means of stored energy (e.g. from a door closer, a spring rope pulley, by a closing weight or overweight of the closing element).
A distinction is made between two basic types:
| Basic type A | Basic type B | |
| manual opening |
motor-driven opening |
|
 |
 |
|
| drive SB 3 includes: |
drive SB 2.4 includes: |
|
| - hold-open device – magnetic clamp | - hold-open device – magnetic clamp | |
| - closing speed control unit | - closing speed control unit | |
| - motor for opening |
The drives shown above make use of the overweight of the closing element or a closing weight as closing energy. They are qualified for standard application. Basic type B is designed for appox. 10-100 opening cycles per day with a permanent function reliability of at least 200 000 cycles.
For specific applications further drive designs are available. To those belong:
| Lever HSD |
As basic type A with door closer as closing element. As basic type B with additional DC or three-phase drive. |
|
| Lever HSD |
The lever- high-speed drive (HSD) is suitable for conveyor system shutters, which are systematically closed during high transit frequency of the material to be conveyed. The opening and closing times are at minimum 0.4 m/s. Thereby 1.000.000 cycles are guaranteed. |
Due to the semi-circular movement the lever drives have an especially smooth start-up behavior. Conditioned by the precise guiding they are particularly suitable in the application of auxiliary units like tilting bridge with rolls, clearing devices or components for pneumatic conveyor plants.
Summary of standard drives
| drive |
Basic type |
mode of operation |
opening/ time |
closing/ time |
emergency- closing |
|
SB 3 |
A |
open |
manually |
0,20 m/s |
0,20 m/s |
|
lever |
A |
open |
manually |
0,12 m/s |
0,20 m/s |
|
SB 2.4 |
B |
open/closed |
0,14 m/s |
0,20 m/s |
0,20 m/s |
|
lever AC |
B |
closed |
0,25 m/s |
0,25 m/s |
0,20 m/s |
|
lever HSD |
B |
closed |
0,40 m/s |
0,40 m/s |
0,20 m/s |
* Please note :
According to the "special provision" in the general technical approval for conveyor system shutters of group Z-6.6-... basic type A shall be applied only if the opening action can be manually performed without any problems floor based or from a stair-head. This requirement relates to all manufacturers and for all makes. In all cases in which this requirement is not possible to meet, at least basic type B shall be applied.
