Hydraulic weighing device

TLDR: In this article, the authors propose to provide buffers as vibration proof means in fluid passages, which are connected to cylinders containing pistons which support a weighing table, to block pressure waves transmitted from pressure reception pipes.

Abstract: PURPOSE:To assure the stability of a pointer, by providing buffers as vibration- proof means in fluid passages, which are connected to cylinders containing pistons which support a weighing table, to block pressure waves transmitted from pressure reception pipes. CONSTITUTION:Buffers 9 shaped as stepped rods are provided in fluid passages 3A-3D to prevent impulsive pressure waves from being transmitted from pressure receiving sections 1 to a load meter 7 through pressure reception pipes 4 and a connector 3. Each buffer 9 comprises a part 9A of outside diameter smaller than the diameter of a hole 3a1 and another part 9B screwed in a tapped hole 3a2. A thin passage 9b, which extends in a radial direction and communicates with another passage 9a, is opened in the peripheral surface of the part 9A. The hole 3a1 and tapped hole 3a2 of the fluid passage 3A communicate with each other only through the passages 9a, 9b. According to this constitution, strong impulsive pressure waves transmitted from the interior of the pressure reception pipe 4 are reflected on the end face of the part 9A so that the pressure waves do not enter into the passage 9b. As a result, the dynamic pressure waves are not transmitted to the interior of a pipe 5 for the meter.