SEISMIC VIBRATION EXCITATION DEVICE Russian patent published in 2013 - IPC G01V1/135 

FIELD: measurement equipment.

SUBSTANCE: seismic vibration excitation device including a piston rod and a circuit board fixed on its lower end face is proposed. The piston rod body includes an axial through channel, and a piston of the piston rod is arranged in the housing of hydraulic cylinder equipped with upper cover plate and separated from pneumatic chamber located below, in which the circuit board is arranged, with a partition wall. The circuit board is installed so that its lower end face interacts with upper end face of cylindrical stepped waveguide, thus forming a pneumatic gripping device. In the piston stock body, and namely in the part adjacent to the circuit board, there is a local expansion of the axial through channel, which forms a cylindrical cavity connected through radial channels to the pneumatic chamber. The axial channel is provided with the stock, on the lower end face of which a sealing element is fixed, which has the possibility of interacting with a seat made on lower end face of the cylindrical cavity. Upper end of the stock is arranged in a valve body rigidly fixed on upper end face of the piston rod and formed with a plate-like base and a cover plate, and equipped with a plate spring-loaded relative to the plate-like base.

EFFECT: reduction and stabilisation of the time from the moment of control signal supply to the moment of dynamic loading of ground semi-space.

2 cl, 2 dwg