There are mainly mechanical (common for the roller belt scale) and electronic two categories. Later appeared TTS type belt scale (three technology scale).
The scale frame structure of electronic belt scale bearing device mainly has double levers multi roller type, single roller type, cantilever and suspension 4. Double levers multi roller and suspension type belt scale shelf measuring long, generally 2 to 8 sets of rollers, high precision, suitable for large flow, the measurement accuracy requirements of high places. Belt speed single roller and cantilever belt scale shelf can be determined by the manufacturer, suitable for small flow or local flow control with local ingredients.
The roller belt scale is composed of a gravity transmission system, a roller, a counter and a speed disc. Speed disc speed is proportional to the belt speed. The angular velocity of the roller is proportional to the amount of material passed through the belt. The position of the roller in the speed disc is adjusted by the gravity of the material. When there is no material on the belt, roller speed close to the center of the disc, the speed is zero, the counter does not cumulative; when material belt, roller with gravity becomes larger to the surrounding mobile, and drives the counter material through the belt on the total record of.