Compound balanced long-stroke oil pumping machine

Abstract

The invention relates to a compound balanced long-stroke oil pumping machine which comprises a base and a frame, wherein a transmission shaft is arranged on a support, a compound balancing mechanism is arranged at the middle part of the transmission shaft, one end of the transmission shaft is connected with a wheel train hanging rope mechanism through a belt transmission part, the other end of the transmission shaft is connected with a direction-changing driving mechanism, and the direction-changing driving mechanism comprises a driving motor, a drive shaft, a connecting rod and a pair of cranks connected with the connecting rod. Through the adoption of the compound balancing structure, the weight of a counterweight can be reduced greatly; furthermore, the rated power of a motor matched with the machine is small, the steel consumption can be reduced by above 35%, and the energy consumption during the using process can be reduced by above 50%. Simultaneously, the stroke and the stroke frequency are simple and convenient to adjust, the configuration of the mechanism does not need to be changed, and the machine has a larger range of application to different oil well states and changes of the oil well states.

Description

technical field [0001] The invention belongs to the technical field of mechanical oil extraction equipment, in particular to a composite balanced long-stroke pumping unit. Background technique [0002] In the known technology, the beam pumping unit usually used in the oil field has bulky volume, high energy consumption and poor load performance due to its structure, especially it is not easy to realize long stroke. Therefore, long-stroke, low-stroke, large-displacement, and heavy-duty pumping units have always been research topics for oil production equipment at home and abroad. Since the beginning of the 21st century, various beamless pumping units have been developed at home and abroad, such as using reversible electric motors or hydraulic motors to drive the drum forward and reverse to realize long-stroke pumping; using a six-link structure to increase the beam pumping capacity Stroke; Utilize pulley block and gear transmission to increase the range and so on. Although ...

AI Technical Summary

Problems solved by technology

However, the range-extending part of the machine has many moving components, the structure is relatively complex, and it is subject to large forces, is easily damaged, and has poor reliability. At the same time, because the reversing drive and the range-extending mechanism are arranged on the top of the frame, it is difficult to install and maintain on site. Manufacturing and operation management High difficulty

Secondly, the double crank and double connecting rod structure is easy to form scissors difference, and the connecting rod is long, which requires high material and manufacturing precision of the connecting rod, which brings great difficulty to manufacturing and installation, and increases the weight of the whole machine , increasing the manufacturing cost

Third, the balance system of the machine adopts the free suspension method. Although it has a good balance effect, it relies on the relative static friction between the sky wheel and the wire rope for transmission. Under heavy load conditions, especially when starting or braking , its transmission reliability is poor, it is easy to cause fatigue and wear of the wire rope, and the service life is short

Fourth, the balance weight is in the state of free suspension, going up and down at high altitude. When the suspension end of the sucker rod loses load, the balance weight weighing several tons suddenly falls from the height, causing a strong impact on the machine base, and the steel wire rope is greatly thrown. Moving can easily lead to accidents

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