| 摘要 |
<p>The weighing apparatus (1) comprises a beam (2) which is supported by a knife edge (3) on a frame (4). A receptacle (5) is suspended from the beam (2) on a knife edge (6), and a weight box (7) is suspended from the beam (2) on a knife edge (8). The beam (2) is provided with an anchoring means (9) to which is attached a tension spring (10) carrying a slipper (11) slidably mounted on a support (12) that is part of the apparatus frame (4). In use a mechanical system moves the slipper (11) to a position between the beam (2) and the slipper support (12), and a weight (13) is added to the weight box (7). The turning moment of the weight (13) causes the beam to rotate and this in turn causes the slipper (11) to be nipped between the beam (2) and slipper support (12). The mechanical system used for moving the slipper is then removed. As the spring (10) is now extended, it provides a biassing force that biasses the slipper out of the nipped position. Flowable material is added to the receptacle (5) through an input valve and as the weight of the material in the receptacle increases so the beam-derived load on the slipper (11) - the 'nipping' load - progressively decreases until a point is reached at which the biassing force is able to remove the slipper from the nipped position. This removal is detected by sensing means which causes the addition of material to the receptacle to be stopped.</p> |
