Long-stroke oil sucking machine with rear-mounted balance pulley

Abstract

The invention provides a long-stroke oil sucking machine with a rear-mounted balance pulley. The long-stroke oil sucking machine with the rear-mounted balance pulley comprises a tower frame, wherein the middle part of a walking beam is connected with the tower frame through a bearing; one end of the walking beam is provided with a mule head; the other end of the walking beam is hinged to one end of a connecting rod; the other end of the connecting rod is hinged to a crank handle driven to rotate by a rotating device; one end, near the connecting rod, of the walking beam is hinged to the lower vertex of a triangular swinging frame; the upper vertex of the triangular swinging frame is pivoted with a shaft of a balance rotating wheel; the side vertex of the triangular swinging frame is connected with the tower frame through a rocker rod; a position, near the edge, of the balance rotating wheel is connected with the tower frame through a pull rod; and one end of a hanging rope is fixedly connected with the edge of the balance rotating wheel, partially bypasses the balance rotating wheel, bypasses the mule head and is then suspended. Through the structure which is also used as a balance weight and is formed by combining the balance rotating wheel, the triangular swinging frame and the pull rod is used, the defects in the prior art can be overcome; the stroke is further increased on the basis of the prior art; the balance rotating wheel which is also used as the balance weight is used; and the dynamic balance of the walking beam can also be realized.

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...

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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