Long stroke rear balance pulley pumping unit

Abstract

The invention provides a long-stroke post-balanced pulley pumping unit, which includes a tower, the middle part of the beam is connected to the tower through a bearing, a donkey head is provided at one end of the beam, and the other end of the beam is hinged to one end of the connecting rod. The other end of the connecting rod is hinged with the crank driven by the driving device, and the end of the beam close to the connecting rod is hinged with the lower apex of the triangular pendulum, and the upper apex of the triangular pendulum is pivotally connected with the shaft of the balance wheel. The side apex of the side is connected to the tower through the rocker; the position near the edge of the balance wheel is connected to the tower through a tie rod; one end of the suspension rope is fixedly connected to the edge of the balance wheel, and partly goes around the balance wheel, and then around the donkey head rear overhang. Through the structure of the combination of the balance wheel, the triangular pendulum and the pull rod that doubles as the counterweight, the defects in the prior art can be overcome, and the stroke can be further increased on the basis of the prior art, and the balance of the counterweight can be used. The runner can also realize the dynamic balance of the beam.

Description

technical field [0001] The invention relates to the field of oil pumping units, in particular to a long-stroke rear balance pulley type oil 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 t...

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 CN 204511396 U discloses a rear stacked tie rod long-stroke pumping unit, which further extends the stroke, but 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 will easily cause fatigue damage to the steel wire rope and shorten the service life of the steel wire rope

And also need to add extra counterweight for balance

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