Lever balance head sheave long stroke pumping unit

Abstract

The invention relates to a lever-balanced sky-wheel-type long-stroke pumping unit for pumping crude oil in an oil field. The reversing balance wheel is driven by the lower part of the frame, connected with the single crank linkage mechanism, and the single crank linkage mechanism is connected with the output shaft on the side of the reducer, and the center wheel shaft is provided on the top of the frame for carrying The sky wheel and transmission wheel of the load, the transmission wheel is connected with the driving reversing balance wheel through a flexible transmission part, and the radial direction of the driving reversing balance wheel is equipped with a lever type balance mechanism. Compared with the prior art, the machine has simple structure, easy to realize long stroke, light weight, less wearing parts, energy saving, material saving, convenient installation and maintenance.

Description

technical field [0001] The invention belongs to the technical field of mechanical oil production equipment, and relates to a lever-balanced sky-wheel type long-stroke pumping unit used for pumping crude oil in an oil field. Background technique [0002] In the known technology, the beam pumping unit usually used in the oil field has its inherent defects due to its structural characteristics, such as bulky, high energy consumption, poor load performance, especially difficult to achieve long stroke. Therefore, long-stroke, low-stroke, large-displacement, and heavy-duty pumping units have always been the research and development direction of 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. Some of the schemes use reversible electric motors or hydraulic motors to drive the drum forward and reverse to realize long-stroke pumping; The stroke of the large beam machine; the r...

AI Technical Summary

Problems solved by technology

However, while this machine has significant advantages, there are also some problems to be solved to varying degrees, such as: the extended range part has many moving components, the structure is relatively complicated, and it is subject to large forces, easily damaged, and poor in reliability. and the range-extending mechanism are set on the top of the rack, which makes it difficult to install and maintain on site, and difficult to manufacture and operate.

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 also 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, and 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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