Oil-pumping machine

Abstract

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 ( 5 a ) for extending a balance weight traction rope ( 10 ) therefrom and a second hole ( 5 b ) 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 ( 5 a ) and the second hole ( 5 b ) 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.

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 ( 5   a ) 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 ( 5   a ) 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 ( 5   b ) 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 ( 5   b ) 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 ( 5   a ) and the second holes ( 5   b ) 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. 
     
     
         2 . The oil-pumping machine according to  claim 1 , wherein the 2×n first and/or second holes are arranged along a straight line parallel to the longitudinal axis in a spaced manner. 
     
     
         3 . The oil-pumping machine according to  claim 2 , wherein the first holes ( 5   a ) are offset from the second holes ( 5   b ) at an angle of 110-145° along the circumference of the secondary sheave. 
     
     
         4 . The oil-pumping machine according to  claim 1 , wherein the number of circles of the oil pumping rod suspension rope ( 2 ) and the balance weight traction rope ( 10 ) in the spiral grooves is determined by the stroke of the oil-pumping machine and the diameter of the secondary sheave; and the maximum winding length of the oil pumping rod suspension rope ( 2 ) and the balance weight traction rope ( 10 ) in the spiral grooves is longer than the stroke of the oil-pumping machine. 
     
     
         5 . The oil-pumping machine according to  claim 4 , wherein at least part of the balance weight traction rope still winds around the spiral grooves at a top dead center of the stroke of the oil-pumping machine, and at least part of the oil pumping rod suspension rope still winds around the spiral grooves at a bottom dead center of the stroke of the oil-pumping machine. 
     
     
         6 . The oil-pumping machine according to  claim 1 , wherein the oil pumping rod suspension rope ( 2 ) and balance weight traction rope ( 10 ) are sized in length such that, when the oil pumping rod suspension rope ( 2 ) winds around the entire span of spiral grooves extending between the one first hole and one corresponding second hole, the balance weight traction rope ( 10 ) completely leaves the spiral grooves. 
     
     
         7 . The oil-pumping machine according to  claim 1 , wherein n=2 and m=8. 
     
     
         8 . The oil-pumping machine according to  claim 1 , wherein the balance weight traction ropes ( 10 ) extending from the 2×n first holes are formed by one single main rope, one end of which is fastened in the first hole closest to one longitudinal end of the secondary sheave, and the other end of the main rope runs toward the other longitudinal end of the secondary sheave by passing through the subsequent first holes one by one alternately into or out of the secondary sheave, and finally inserted and fastened in the first hole closest to the other longitudinal end of the secondary sheave, so as to form the 2×n balance weight traction ropes ( 10 ) which are connected to each other. 
     
     
         9 . The oil-pumping machine according to  claim 1 , wherein the oil pumping rod suspension ropes ( 2 ) extending from the 2×n second holes are formed by one single main rope, one end of which is fastened in the second hole closest to one longitudinal end of the secondary sheave, and the other end of the main rope runs toward the other longitudinal end of the secondary sheave by passing through the subsequent second holes one by one alternately into or out of the secondary sheave, and finally inserted and fastened in the second hole closest to the other longitudinal end of the secondary sheave, so as to form the 2×n oil pumping rod suspension ropes which are connected to each other. 
     
     
         10 . The oil-pumping machine according to  claim 1 , wherein two flat spiral spring arrangements ( 13 ) are disposed inside the cylinder of the secondary sheave ( 5 ) with opposite directions of spiral, and at a upper or lower dead center of the stroke of the oil-pumping machine, only one of the flat spiral spring arrangements ( 13 ) is in an energy storage mode, and the extensible length of the springs is greater than the stroke of the oil pumping rod. 
     
     
         11 . The oil-pumping machine according to  claim 1 , further comprising a guide sheave support ( 20 ) with one end pivotably mounted on the platform and with another end, as a cantilever, extending beyond the platform ( 8 ) and equipped with the guide sheave; wherein the guide sheave support ( 20 ) and the guide sheave ( 4 ) are configured to pivot upwardly with respect to the platform in a plane perpendicular to the plane of the platform ( 8 ) by means of the rotation of the secondary sheave ( 5 ). 
     
     
         12 . The oil-pumping machine according to  claim 11 , further comprising a positioning tab ( 22 ) on the platform ( 8 ) for adjusting and positioning the guide sheave, wherein the positioning tab is disposed under the guide sheave support and is configured to cooperate with a recess on the bottom of the guide sheave support to position the guide sheave ( 4 ) and adjust an elevation angle of the guide sheave ( 4 ) in range of 6° to 12° with respect to the platform ( 8 ). 
     
     
         13 . The oil-pumping machine according to  claim 1 , wherein the electric motor ( 27 ) directly or via a speed reducer ( 106 ) drives the secondary sheave ( 5 ). 
     
     
         14 . The oil-pumping machine according to  claim 1 , wherein the electric motor ( 27 ) couples to and drives the secondary sheave ( 5 ) via a transmission ( 6 ); the secondary sheave ( 5 ) at one end thereof comprises an annular gear ( 7 ) and is rotatably mounted on a secondary sheave shaft ( 19 ) which is arranged along the longitudinal axis thereof; the transmission ( 6 ) comprises a sun gear ( 6   a ) coupled to an output end of the electric motor, a planet carrier ( 6   c ) fixed on the secondary sheave shaft ( 19 ), and at least two planet gears ( 6   b ) rotatably mounted on the planet carrier, wherein the planet gears mesh with the annular gear ( 7 ) and the sun gear ( 6   a ). 
     
     
         15 . The oil-pumping machine according to  claim 1 , wherein the electric motor ( 27 ) is in form of a permanent magnetic synchronous tractor. 
     
     
         16 . The oil-pumping machine according to  claim 1 , wherein the oil-pumping machine is equipped with a wind power system comprising a wind generator ( 123 ), a fan controller ( 125 ) and a storage battery ( 116 ) which are connected to each other in sequence, wherein the storage battery ( 116 ) is connected through an inverter ( 126 ) to a control, management and drive system ( 31 ) of the oil-pumping machine which is configured to manage and drive the electric motor. 
     
     
         17 . The oil-pumping machine according to  claim 16 , wherein the wind generator ( 23 ) is arranged on the platform ( 8 ) on top of the main frame, and the storage battery ( 116 ) is mounted within the balance weight ( 11 ). 
     
     
         18 . The oil-pumping machine according to  claim 1 , wherein the oil-pumping machine is equipped with a luminous energy power system comprising a photovoltaic module ( 117 ), a photovoltaic controller ( 129 ) and a storage battery ( 116 ) which are connected to each other in sequence, wherein the storage battery ( 116 ) is connected through an inverter ( 126 ) to a control, management and drive system ( 31 ) of the oil-pumping machine which is configured to manage and drive the electric motor.