OIL-PUMPING MACHINE

摘要

Disclosed is an oil-pumping machine, which is characterized in that it is composed of a secondary sheave (5) of a wheel-cylinder type driven by an electric motor. The secondary sheave has a first hole (5a) for extending a balance weight traction rope (10) therefrom and a second hole (5b) for extending an oil pumping rod suspension rope (2) therefrom which are respectively arranged in a left half and a right half of the secondary sheave, and the secondary sheave is also provided with multiple rounds of spiral grooves (29) in opposite rotating directions on the left and right parts; wherein the first hole (5a) and the second hole (5b) are spaced within the corresponding spiral grooves in such a matter that at least one part of the spiral groove is shared by both the oil pumping rod suspension rope (2) and the balance weight traction rope (10) during operation, and the oil pumping rod suspension rope (2) and the balance weight traction rope (10) wind in opposite directions and they wind around and unwind from the at least one part of the spiral groove without interfering with each other.

主权项

1. An oil-pumping machine, comprising a main frame (9), an oil pumping rod (1), a balance weight (11), a platform (8) disposed on top of the main frame, and an electric motor (27), a guide sheave (4) and a secondary sheave (5) that are disposed on the platform (8), wherein the electric motor is configured to drive the secondary sheave to rotate about a longitudinal axis of the secondary sheave, wherein the secondary sheave comprises a left half and a right half disposed along the axis, wherein a circumference of the secondary sheave (5) is provided with first holes (5a) by number of 2×n, with the n first holes arranged on the left and the n first holes arranged on right halves respectively; wherein a balance weight traction rope (10) extends from each of the first holes (5a) respectively and is connected to a fastener (16) on the balance weight (11) to constitute a balance weight operation and traction system; wherein the circumference of the secondary sheave (5) is further provided with second holes (5b) by number of 2×n, with the n second holes arranged on the left and the n first holes arranged on right halves respectively; wherein an oil pumping rod suspension rope (2) extends from each of the second holes (5b) respectively and is connected to the oil pumping rod (1) through the guide sheave (4) via a tractor (3) to constitute an oil pumping rod operation and traction system; 2×m circles of spiral grooves are formed around the circumference of the secondary sheave (5), here n and m being natural numbers and m greater than n, wherein the m circles of the spiral grooves are disposed on the left half while the other m circles of the spiral grooves are disposed on the right half, wherein the spiral grooves on the left half have a spiral direction opposite to that of the spiral grooves on the right half; and wherein the first holes (5a) and the second holes (5b) are arranged within the spiral grooves in such a spaced manner that at least part of the spiral grooves is shared by both the oil pumping rod suspension rope (2) and the balance weight traction rope (10) during operation, and thus the oil pumping rod suspension rope (2) and the balance weight traction rope (10), in opposite directions, wind around or unwind from the at least part of the spiral grooves without interfering with each other.