Load cell with roberval structure having anti-offset function, and weighing device
A load cell with a Roberval structure having an anti-offset function, and a weighing device are disclosed. The load cell includes strain detection elements mounted on an elastic element, which includes a loading portion for receiving a load from a connector, a fixing portion for fixing the elastic element, a strain generation portion for converting the load into deformation, and a parallel guide beam for transferring the load and keeping the loading portion translational when loaded. The strain generation portion includes at least one hollow cavity body. The loading portion and the fixing portion are respectively located on left and right sides of the strain generation portion. The parallel guide beam is located at upper and lower portions of the strain generation portion. A center of rotation and a geometric center of the strain generation portion coincide when the load cell with the Roberval structure is loaded.
1 . A load cell with a Roberval structure having an anti-offset function, the load cell comprising:
an elastic element for bearing a load; and
a plurality of strain detection elements for detecting deformation, the strain detection elements being mounted on the elastic element;
wherein the elastic element comprises:
a loading portion for receiving a load from a connector,
a fixing portion for fixing the elastic element,
a strain generation portion for converting the load into deformation, and
a parallel guide beam for transferring the load and keeping the loading portion translational when loaded;
wherein the strain generation portion comprises at least one hollow cavity body, the loading portion and the fixing portion are respectively located on left and right sides of the strain generation portion, and the parallel guide beam is located at upper and lower portions of the strain generation portion; and
wherein:
the upper portion of the strain generation portion comprises at least two elements which extend parallelly and are biased towards the fixing portion or towards the loading portion; or
the lower portion of the strain generation portion comprises at least two elements which extend parallelly and are biased towards the loading portion or towards the fixing portion;
wherein the strain generation portion comprises three hollow cavity bodies, wherein one of the three hollow cavity bodies is a first strain generation portion, the other two cavity bodies are second strain generation portions;
wherein the first strain generation portion is disposed in a middle of the elastic element, and the second strain generation portions are respectively disposed on upper and lower sides of the first strain generation portion;
wherein the first strain generation portion is H-shaped, circular, square, of rectangular, and a centerline of the second strain generation portion is U-shaped;
wherein the strain detection elements are respectively arranged inside the second strain generation portions, and respectively correspond to the positions of the upper and lower portions of the first strain generation portion.
2 . A weighing device comprising a load cell with a Roberval structure having an anti-offset function, said load cell comprising:
an elastic element for bearing a load; and
a plurality of strain detection elements for detecting deformation, the strain detection elements being mounted on the elastic element;
wherein the elastic element comprises:
a loading portion for receiving a load from a connector,
a fixing portion for fixing the elastic element,
a strain generation portion for converting the load into deformation, and
a parallel guide beam for transferring the load and keeping the loading portion translational when loaded;
wherein the strain generation portion comprises at least one hollow cavity body, the loading portion and the fixing portion are respectively located on left and right sides of the strain generation portion, and the parallel guide beam is located at upper and lower portions of the strain generation portion; and
wherein:
the upper portion of the strain generation portion comprises at least two elements which extend parallelly and are biased towards the fixing portion or towards the loading portion; or
the lower portion of the strain generation portion comprises at least two elements which extend parallelly and are biased towards the loading portion or towards the fixing portion;
wherein the strain generation portion comprises three hollow cavity bodies, wherein one of the three hollow cavity bodies is a first strain generation portion, the other two cavity bodies are second strain generation portions, the first strain generation portion is disposed in a middle of the elastic element, and the second strain generation portions are respectively disposed on upper and lower sides of the first strain generation portion;
wherein the first strain generation portion is a circular, square, rectangular, or a unitary object having an outline shaped as two pairs of partially combined circles spaced apart from one another by a rectangle which is partially combined with each of the circles, and a centerline of the second strain generation portion is U-shaped;
wherein the strain detection elements are respectively arranged inside the second strain generation portions, and respectively correspond to the positions of the upper and lower portions of the first strain generation portion.