Weighing Sensor

The invention discloses a weighing sensor and an electronic scale provided with the same. The weighing sensor comprises a flat plate formed into helical shape, including successively a load-supporting portion, a strain portion and a bearing portion from the centre to the outer of this plate, with the load-supporting portion situated between and surrounded by the bearing portion and the strain portion; wherein the load-supporting portion and the bearing portion are respectively used to bear the acting force and the reaction force in opposite directions, and a strain gauge is mounted on the strain portion.

The electronic scale comprises at least three weighing sensors, wherein the bearing portion of the sensor is mounted on the scale body, the load-supporting portion directly contacts the supporting leg of the scale, which contacts the plane on which the scale is positioned. The present invention has small thickness, simple structure and low manufacturing cost.

The present utility model relates to a sensor, in particular to a self-supporting weighting sensor used in an electronic human weight scale. The present utility model also relates to a scale provided with three or more such sensors.

One object of the present utility model is to provide a sensor with low manufacturing cost, simple structure and small thickness. Another object of the present utility model is to provide a scale provided with three or more such sensors. To solve the above problems, the present utility model adopts the following technical solutions.

There is provided a weighing sensor, comprising a strain rod provided with a strain gauge, a bearing frame and a load-supporting rod located at both sides of the strain rod respectively, wherein the bearing frame and the load-supporting rod are respectively used to bear acting force and reaction force thereof which are opposite in directions, characterized in that the bearing frame, the load-supporting rod and the strain rod are formed by same piece of sheet metal; the bearing frame is in "C"-shape; and the load-supporting rod is situated between and surrounded by the bearing frame and the strain rod.

The "C"-shaped bearing frame bears the acting force from a base frame, and the load-supporting rod surrounded by the bearing frame and the stain rod bears the reaction force which is transferred by the supporting leg of the scale. As a preferred embodiment of the utility model, a spherical or conical protrusion or depression is provided on the load-supporting rod, so that the force directly acts on the top end of the protrusion or the bottom end of the depression.

There is provided an electronic scale provided with three or more such weighting sensors, characterized in that the bearing frame of the sensor is fixed on the scale body; the load-supporting rod directly contacts the supporting leg of the scale; and the supporting leg contacts the plane on which the scale is positioned.

The load-supporting rod of the sensor makes point contact with the supporting leg, and there may exist relative movement between them. The supporting leg includes a base frame; a sensor supporting plate is mounted in the base frame; and a cover plate is mounted on the base frame.

The beneficial effects of the present utility model are as follows: the load-supporting rod, the strain rod and the bearing frame of the present utility model are all formed out of the same piece of sheet metal by punching, which may directly bear the reaction force transferred by the supporting leg of the scale, no need for additionally fixing a metal support thereon. Therefore, the sensor with such a structure is simple in structure and for processing, low-cost for manufacturing, convenient for installing, and capable of making the entire electronic scale thinner and more fashionable.