| 摘要 |
The invention relates to a device for trenching fixed-bar screens through which the raw coal is sorted According to the invention, the device comprises some parallely lying lamellas (1) mounted on a shaft (3) which can be rotated simultaneously with the lamellas (1) The shaft (3) is connected to some levers (5) operated by some pneumatic cylinders (b) which are linked at the bottom with a carriage (7), the lamellas (1) being secured by some side members (8) Each lamella (1) is provided with a cut-out (c), every cut-out (c) being located at the same level, a stopping element (9) can slide between the cut-outs to lock the lamellas (1) at their maximum stroke
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