Sensor assembly, force detection device and method, and construction machinery

A construction machinery, comprising a force detection device, wherein the force detection device comprises a force bearing device and a sensor assembly comprising a connecting part used for connecting a base to be tested and a bearing part used for bearing, wherein the bearing part is connected to the connecting part, the bearing part comprises:

• a first sensing unit;
• and
• a second sensing unit, wherein the measuring range of the first sensing unit is greater than that of the second sensing unit,
• the first sensing unit has a first initial gap b1 from the connecting part,
• the second sensing unit has a second initial gap b2 from the connecting part,
• the first initial gap b1 is smaller than the second initial gap b2, so that corresponding initial gaps are eliminated when a load applied to the bearing part reaches different extents, and
• the sensor assembly comprises an elastic gasket arranged between the second sensing unit and the connecting part, such that:
• when an acting force borne on the bearing part is lower than a preset value, the first initial gap b1 is not eliminated and the first sensing unit does not contact the connecting part and the second sensing unit contacts the connecting part via the elastic gasket, and
• when the acting force borne on the bearing part reaches a predetermined value higher than the preset value, the first initial gap b1 is eliminated and the second sensing unit contacts the connecting part via the elastic gasket.