GB496190A - Electrically operated volumetric weighing apparatus for granular materials - Google Patents

Abstract

496,190. Automatic - feed weighers. SOC. DES COMPTEURS VOLUMETRIQUES. May 26, 1938, No. 15707. Convention date, Nov. 4, 1937. [Class 143] An apparatus for determining automatically the volume and weight of granular material comprises a weigh hopper carried by a lever system connected to an automatic steelyard, a supply hopper from which the weigh hopper is always filled to a constant extent, a shutter separating the supply and weigh hopper, a discharge door at the base of the weigh hopper and electrical means set in action through the initial impulse of an electric motor for releasing the automatic steelyard and for operating the shutter and discharge door The material is delivered to a supply hopper 12 having a volume greater than that of the weigh hopper 3. The material accumulating in the supply hopper ultimately presses upon and closes an electric contact 13 thereby starting a motor 15 which rotates a contact-bearing distributer 18 and opens and closes a shutter 14, sufficient time being allowed for the weigh hopper 3 to fill, the flow being arrested by choking at the mouth of the weigh hopper. A constant volume is thus ensured in the hopper and the number of volumes discharged may be registered on a counter. When the shutter 14 has completely closed, the distributer 18 energizes an electromagnet 5 and also stops the motor 15. The electromagnet 5 releases an automatic steelyard of known kind, and the weight in the weigh hopper 3 is indicated and added to a totalizer. A motor 29 then starts up and returns the steelyard poise to its starting point, the consequent upsetting of the equilibrium causing closure of a contact 6 to start a motor 8. The motor 8 drives a second contact-bearing distributer 11 and opens and closes a discharge gate 7. As the discharge gate closes after liberation of the material, the distributer 11 energizes the motor 15 to reset the same in readiness for the next closure of the contact 13. If, at the end of a series of operations, the material has not risen to the contact 13, a partial load may be weighed by manual operation of a contact associated with a time-delayed relay device which retards the starting of the weighing cycle by much longer than the normal time of filling. The material from the weigh hopper 3 is discharged into a lower hopper. If choking occurs in the lower hopper, an electric contact therein is closed by the pressure and causes the discharge gate 7 to remain open and arrest further operation until the choking has sufficiently diminished. Specification 409,629, [Group XXIX], is referred to.