SCREEN SHAKER Russian patent published in 2006 - IPC B07B1/40 B07B1/42 

FIELD: petroleum industry; natural gas industry; production of devices for drilling mud fluid cleaning.

SUBSTANCE: the invention is pertaining to the field of petroleum industry and natural gas industry, in particular, to production of devices for drilling mud fluid cleaning. The screen shaker consists of: a base; a frame mounted with the help of dampers; screen plates fixed on the frame; a device of changing a tilt angle of the frame; a feeding chute; a vibration exciter mounted on the beam fixed to the frame. The beam is made in the form of a resilient construction, the stiffness of which together with the stiffness of the dampers in a direction of a vector of the vibrations of the frame and the mass of the frame are defined by the following: ratio C + Ca·n/M = ω² , where C is the stiffness of the beam in respect to the frame, in H/m; Ca is stiffness of one damper, in H/m; n is a quantity of dampers, in pieces; M is the mass of the frame, in kg; ω is a resonance angular frequency of the frame vibrations, in radians/s; at that the beam is connected to the frame in its lower part by means of the vertical poles having heightened stiffness in a direction of vector of vibrations of the frame and made with a capability of being deformed in a horizontal direction together with the ends of the beam, the vibration exciter is connected to the mains supply through a frequency converter made with a capability of the electric current frequency change. On the frame there is a vibrations sensor connected to a device for control over a frequency converter, the output of which is connected to the channel of control of the frequency converter and the device for control over the frequency converter is made with a capability of operation in two modes: the mode of a manual adjustment of the frame vibrations and the mode of an automatic keeping of the preset values of the frame vibrations. The technical result of the invention is an increased stability of maintenance of a preset value of vibration acceleration of the frame of the resonance screen shaker.

EFFECT: the invention ensures an increased stability of maintenance of the resonance screen shaker frame preset values of vibration acceleration.

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