Long-stroke dynamic balance type pumping unit

Abstract

The invention provides a long-stroke dynamic balance type pumping unit which comprises a tower frame. The middle of a walking beam is connected with the tower frame through a bearing. A horse head is arranged at one end of the walking beam, the other end of the walking beam is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to a crank which is driven to rotate by a driving device. The end, close to the connecting rod, of the walking beam is hinged to the lower vertex of a triangular swing frame, the upper vertex of the triangular swing frame is pivoted to a shaft of a sector turning wheel, and the side vertex of the triangular swing frame is connected with the tower frame through a rocking bar. The position close to the edge of the sector turning wheel is connected with the tower frame through a pull rod. One end of a suspension rope is fixedly connected with the edge of the sector turning wheel, and the suspension rope partially winds across the sector turning wheel and then winds across the horse head to be overhung. Due to the combined structure of the sector turning wheel serving as a balance weight at the same time, the triangular swing frame and the pull rod, the stroke can be further prolonged; the center of gravity can be changed more obviously through rotation of the sector turning wheel serving as the balance weight at the same time, and the weight borne by the entire walking beam can be lowered on the premise that the dynamic adjusting effect is improved.

Description

technical field [0001] The invention relates to the field of pumping units, in particular to a long-stroke dynamic balance type pumping unit. Background technique [0002] According to the structure, the long-stroke pumping unit can be divided into two categories: beam pumping unit and beamless pumping unit. The current beamless long-stroke pumping units mainly include tower pumping units and hydraulic pumping units. The beamless long-stroke pumping units have achieved good results in increasing the stroke, but there are some disadvantages: the tower type The reliability of the reversing mechanism of the pumping unit is not high, and the production and maintenance cost of the hydraulic pumping unit is high and the efficiency is low. So their promotion is limited. [0003] There are also many disadvantages in the existing beam-type long-stroke pumping unit: the long-stroke pumping unit with increased beam swing angle is often not well stressed; On one side of the forearm...

AI Technical Summary

Problems solved by technology

The current beamless long-stroke pumping units mainly include tower pumping units and hydraulic pumping units. The beamless long-stroke pumping units have achieved good results in increasing the stroke, but there are some disadvantages: the tower type The reliability of the reversing mechanism of the pumping unit is not high, and the production and maintenance costs of the hydraulic pumping unit are high and the efficiency is low

So their promotion is limited

[0003] There are also many disadvantages in the existing beam-type long-stroke pumping unit: the long-stroke pumping unit with increased beam swing angle is often not well stressed; On the side of the forearm, the balance weight increases, which shortens the service life of the relevant bearings; the service life of the steel wire rope is generally very short for long-stroke pumping units with movable pulleys

[0004] Chinese patent document CN201381839Y discloses a long-stroke oil pumping unit with a rear triangular swing frame. The long stroke is realized by a rear triangular swing frame and the pump efficiency is improved. The problem is that the stroke is still not long enough and an additional counterweight to balance

[0005] Chinese patent document CN204511396U discloses a rear stacked tie rod long-stroke pumping unit, the stroke is further extended through the combined structure of the front triangle pendulum type tie rod (17) and the rear triangle pendulum type tie rod (18). However, at the position where the front triangular pendulum type tie rod (17) contacts the steel wire rope (9), the steel wire rope concentrates on this position and repeatedly bends and deforms, which easily causes fatigue damage to the steel wire rope and shortens the service life of the steel wire rope.

And also need to add extra counterweight for balance

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