Platform scale and load detection unit

摘要

(Problem);To provide a high precision platform scale;(Means to Solve the Problem);A platform scale for weighing an object to be weighed by supporting it by a plurality of load detection sections, wherein the load detection section comprises a load sensor 40 having a block body 42 for transmitting an applied load to a tuning fork vibrator 41 coupled to the block body 42 by reducing the load, a circuit board having fabricated thereon circuitry for converting a signal from the tuning fork vibrator into a digital signal and a sensor case 33 for accommodating the load sensor and the circuit board. The sensor case 33 is made by casting stainless material by a lost wax process and is directly coupled to parallel base frames 20 for maintaining the distance between the base frames. The sensor case has sufficient mechanical strength and also acts as a structural member for the base frames, thereby reducing the number of components and the height of a weighing table.

主权项

1. A platform scale for weighing an object to be weighed by supporting it with one or a plurality of load detection section characterized in that the load detection section comprises:
a load sensor including a tuning fork vibrator and a block body coupled to the tuning fork vibrator for transmitting an applied load by reducing the load; a circuit board mounting thereon circuitry for converting a signal from the tuning fork vibrator into a digital signal; and a sensor case for accommodating the load sensor and the circuit board; wherein the sensor case is made of casting stainless material by a lost wax process and is directly coupled to parallel base frames in a manner to maintain the distance between the base frames, wherein said sensor case and said parallel base frames together form a substantially rigid base, with said sensor case having sufficient rigidity to serve as a structural member for maintaining the distance between the base frames; wherein the sensor case comprises a load sensor chamber for containing the load sensor, a circuit board chamber for containing the circuit board and an isolation wall for preventing air flow between the load sensor chamber and the circuit board chamber and ventilation of the load sensor chamber is carried out only through an air hole in the bottom of the load sensor chamber.