Automatic calibration device for conveyor belt integrating scales

An automatic calibration device (100) for an integrating conveyor belt scale having a weigh bridge (41) comprising berths (30, 31, 32, 33), the automatic calibration device (100) comprising:

• an actuator (14) comprising a cylinder plunger (14A);
• beams (1, 2) comprising rest berths (16, 17, 18, 19);
• standard weights (11, 12) respectively including rods (34, 35, 36, 37) configured to be supported on the rest berths when not in calibration;
• shafts (3, 4) cooperatively connected to the beams through respective arms (22, 23, 24, 25) bound by joints (7, 8, 9, 10);
• bearings (26, 27, 28, 29) respectively at the ends of the shafts, the bearings connecting the automatic calibration device (100) to a housing (13) of the integrating conveyor belt scale (150), the integrating conveyor belt scale being fixed by connection parts (15, 38, 39, 40) to a conveyor structure connected to the ground;
• lever arms (5, 6) connected respectively to the shafts;
• and
• a transfer mechanism configured to move the standard weights (11, 12) from the rest berths (16, 17, 18, 19) to the berths (30, 31, 32, 33) of the weigh bridge (41) upon an expansion movement of the cylinder plunger (14A), wherein the actuator (14) is connected by the joints (7, 8, 9, 10) to the lever arms (5, 6), the lever arms (5, 6) being connected to the shafts (3, 4) in complementary and opposite angles;
• wherein the expansion movement of the actuator (14) causes the lever arms (5, 6) to move apart such that the movement of the lever arms (5, 6) causes rotation of the shafts (3, 4) in the same rotational direction.