Three-electric motor self-synchronizing elliptical vibrating screen based on movement composition principle

Abstract

The invention relates to a tri-exciting-motor self synchronizing elliptical vibrating screen based on the principle of kinematic synthesis, belonging to the technical fields of petroleum drilling, chemical fertilizer, construction, food and pharmacy. The technical proposal adopted is that: the axes of a vibration motor (1) and a vibration motor (2) are parallel to each other, and the eccentric mass-radius products of the two motors are identical; while in operation, the two motors rotate at the same speed while in the reverse direction, the axis of a vibration motor (3) is perpendicular to those of the vibration motors (1) and (2), and the rotation speed of the vibration motor (3) is equal to those of the vibration motors (1) and (2); the rectilinear motions of the vibration motors (1) and (2) are synthesized with the circular motion produced by the vibration motor (3), so as to achieve the elliptical motion of a screen box. By adjusting the eccentric mass-radius product, the ellipticity and the amplitude of the elliptical vibration can be varied; by changing the relative position between the vibration motors and the overall center of mass of the screen box, the balance elliptical motion or variable elliptical motion of the screen box can be accomplished. By adopting the three exciting motors, the elliptical vibration screen has the advantages of generating larger vibrating force, being applicable to the vibration screens with large screening areas, and achieving elliptical, rectilinear and circular three vibration motions.

Description

technical field [0001] The invention relates to a three-motor self-synchronized elliptical vibrating screen based on the principle of motion synthesis, which is used in oil and gas drilling operations, and in industries such as chemical fertilizers, metallurgy, construction, food, pharmaceuticals, textiles, and mineral processing. Background technique [0002] Among the self-synchronizing elliptical vibrating screens proposed at home and abroad, there are mainly US patent US5265730, Chinese patents ZL02235186.8, ZL02221465.8, ZL00244620.0, ZL00259925.2, etc. [0003] The self-synchronizing elliptical vibrating screen proposed by the US patent US5265730 adopts two short excitation motors arranged in the shape of "eight" on both sides of the screen box. Torsional load and bending load, and the force condition of the screen box are complicated. When designing, to realize the balanced movement of the screen box, the connection line between the midpoints of the axes of the two mo...

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Problems solved by technology

[0003] The self-synchronizing elliptical vibrating screen proposed by the US patent US5265730 adopts two short excitation motors arranged in the shape of "eight" on both sides of the screen box. Torsional load and bending load, the force condition of the screen box is complicated, and the balanced motion of the screen box must be realized during design, and the connection line between the midpoints of the axes of the two motors must pass through the center of mass of the entire screen box, which brings great difficulty to the design

Chinese patent ZL02235186.8, on the basis of the US patent, maintains a circumferential angle between the eccentric blocks at both ends of the exciting motor shaft, so that when designing the vibrating screen, the line connecting the midpoints of the axes of the two motors does not need to pass through the entire screen The center of mass of the box can realize the balanced elliptical motion of the vibrating screen, but the circumferential angle between the eccentric blocks at both ends of the exciting motor shaft reduces the exciting force generated by the motor and reduces the performance of the vibrating screen.

Chinese patent ZL02221465.8 proposes the use of 4 or more even-numbered excitation motors to solve the problem of insufficient excitation force in the above-mentioned US patent US5265730, but the problems in design and installation have not been improved

The self-synchronizing elliptical vibrating screen proposed by Chinese patent ZL00244620.0 uses two excitation motors with different mass-diameter products to be installed horizontally above the screen box in parallel, which is very convenient in design, processing and installation, but in order to ensure a certain ellipticity, the difference between the mass-diameter products of the two motors is large, and the parameters such as the amplitude of the vibrating screen are greatly affected. Small, the vibration amplitude is difficult to meet the requirements of the screening process during design

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