Power Control Method for Vertical Pumping Unit

Abstract

The present disclosure provides a power control method for a vertical pumping unit. A whole stroke of the vertical pumping unit is divided into four running stroke sections of upper-range upward, upper-range downward, lower-range downward and lower-range upward. Every time when a motor control system receives a neutral position signal, at least one upward or downward motor running parameter is converted according to a specified stroke setting of an upper half range or a lower half range, and reversing is implemented after running according to at least one specified stroke parameter is completed or one of an upper position signal and an lower position signal is triggered. When another neutral position signal is received again, the motor control system automatically performs zero position calibration.

What is claimed is: 
     
         1 . A control method for a vertical pumping unit, a load end of the vertical pumping unit being driven by a motor of a driving system to reciprocate for an upward stroke and a downward stroke, the control method comprising:
 setting at least one initialization parameter of the motor for controlling the pumping unit load end to start running from an initial position;   when the pumping unit load end runs to a midpoint position of the upward stroke or a midpoint position of the downward stroke, generating a neutral position signal;   under triggering of the neutral position signal, clearing a numerical value of a counter configured to count running strokes of the motor, and adopting the counter to perform recounting to obtain at least one required running stroke parameter of the motor according to a preset required running distance value of the pumping unit load end; and   controlling the motor to start running according to the at least one required running stroke parameter of the motor.   
     
     
         2 . The control method as claimed in  claim 1 , further comprising: when the pumping unit load end runs to a forced reversing position at a predetermined distance away from a limit position of the upward stroke, controlling a pumping unit position sensor system to generate an upper position signal, or, when the pumping unit load end runs to a forced reversing position at the predetermined distance away from a limit position of the downward stroke, controlling the pumping unit position sensor system to generate a lower position signal. 
     
     
         3 . The control method as claimed in  claim 2 , further comprising: when controlling the motor to start running according to the at least one required running stroke parameter of the motor, determining whether the pumping unit position sensor system generates the upper position signal or the lower position signal or not. 
     
     
         4 . The control method as claimed in  claim 3 , further comprising: when determining that the pumping unit position sensor system generates the upper position signal or the lower position signal, controlling the motor to execute a forced reversing operation according to the upper position signal or the lower position signal. 
     
     
         5 . The control method as claimed in  claim 3 , further comprising: when determining that a running position of the pumping unit load end does not reach a position of the upper position signal or the lower position signal, controlling the motor to be reversed for running after completing running according to the at least one required running stroke parameter of the motor. 
     
     
         6 . The control method as claimed in  claim 2 , further comprising: after setting the at least one initialization parameter for controlling the pumping unit load end to start running from the initial position, determining whether the pumping unit position sensor system generates the upper position signal or the lower position signal or not;
 when determining that the pumping unit position sensor system does not trigger the upper position signal or the lower position signal and when the pumping unit load end runs to the midpoint position of the upward stroke or the midpoint position of the downward stroke, controlling the pumping unit position sensor system to generate a neutral position signal; and   when determining that the pumping unit position sensor system generates the upper position signal or the lower position signal, controlling the motor to execute the forced reversing operation according to the upper position signal or the lower position signal.   
     
     
         7 . The control method as claimed in  claim 2 , further comprising: when the pumping unit load end runs to the limit position of the upward stroke, controlling the pumping unit position sensor system to generate an upward limit position signal, or, when the pumping unit load end runs to the limit position of the downward stroke, controlling the pumping unit position sensor system to generate a downward limit position signal. 
     
     
         8 . The control method as claimed in  claim 7 , further comprising: controlling the vertical pumping unit to be forcibly de-energized according to the upward limit position signal or the downward limit position signal. 
     
     
         9 . The control method as claimed in  claim 1 , further comprising: dividing the upward stroke into a lower-range upward running stroke section and an upper-range upward running stroke section according to the midpoint position of the upward stroke. 
     
     
         10 . The control method as claimed in  claim 9 , further comprising: dividing the downward stroke into an upper-range downward running stroke section and a lower-range downward running stroke section according to the midpoint position of the downward stroke. 
     
     
         11 . The control method as claimed in  claim 10 , further comprising: the required running distance value of the pumping unit load end being a distance value in the upper-range upward running stroke section or a distance value in the lower-range downward running stroke section. 
     
     
         12 . The control method as claimed in  claim 11 , wherein setting the at least one initialization parameter for controlling the pumping unit load end to start running from the initial position comprises:
 setting at least one running parameter of the motor and at least one stroke parameter of the vertical pumping unit, the at least one stroke parameter comprising the distance value in the upper-range upward running stroke section and the distance value in the lower-range downward running stroke section; and   controlling the motor to run according to the at least one running parameter and driving, through a mechanical transmission device of the pumping unit, the pumping unit load end to run, the mechanical transmission device comprising a belt, a gear speed reducer and a chain transmission system.   
     
     
         13 . The control method as claimed in  claim 12 , wherein generating the neutral position signal when the pumping unit load end runs to the midpoint position of the upward stroke or the midpoint position of the downward stroke comprises one of the followings:
 when the pumping unit load end runs to the midpoint position of the upward stroke, generating an upward neutral position signal, and entering the upper-range upward running stroke section; and   when the pumping unit load end runs to the midpoint position of the downward stroke, generating a downward neutral position signal, and entering the lower-range upward running stroke section.   
     
     
         14 . The control method as claimed in  claim 13 , wherein under triggering of the neutral position signal, clearing the numerical value of the stroke counter and adopting the stroke counter to perform recounting to obtain the at least one required running stroke parameter of the motor according to the required running distance value of the pumping unit load end comprises one of the followings:
 under triggering of the upward neutral position signal, clearing the numerical value of the stroke counter and adopting the stroke counter to perform recounting to obtain the at least one required running stroke parameter of the motor according to the distance value of the pumping unit load end in the upper-range upward running stroke section; and   under triggering of the downward neutral position signal, clearing the numerical value of the stroke counter and adopting the stroke counter to perform recounting to obtain the at least one required running stroke parameter of the motor according to the distance value of the pumping unit load end in the lower-range downward running stroke section.   
     
     
         15 . The control method as claimed in  claim 14 , wherein controlling the motor to start running according to the at least one required running stroke parameter of the motor comprises one of the followings:
 controlling the motor to start running according to the at least one required running stroke parameter of the motor, and controlling the motor to be reversed to enter the upper-range downward running stroke section after completing running according to the at least one required running stroke parameter or under triggering of the upper position signal; and   controlling the motor to start running according to the at least one required running stroke parameter of the motor, and controlling the motor to be reversed to enter the lower-range upward running stroke section after completing running according to the at least one required running stroke parameter or under triggering of the lower position signal.   
     
     
         16 . The control method as claimed in  claim 2 , wherein at least one of the neutral position signal, the upper position signal and the lower position signal, an upward limit position signal and a downward limit position signal is generated through the pumping unit position sensor system. 
     
     
         17 . The control method as claimed in  claim 1 , further comprising:
 acquiring a first circumferential azimuth signal of an upper sprocket shaft of a driving system in a rotating process; and   calculating a stroke position of the pumping unit load end according to the first circumferential azimuth signal and a rotation direction of the motor.   
     
     
         18 . The control method as claimed in  claim 17 , further comprising:
 acquiring a second circumferential azimuth signal of a gear in a transmission relationship with the upper sprocket shaft in the rotating process; and   calculating the stroke position of the pumping unit load end according to the second circumferential azimuth signal and the rotation direction of the motor.   
     
     
         19 . The control method as claimed in  claim 1 , wherein the motor is a stepless speed regulation motor that is reversed for reciprocation. 
     
     
         20 . The control method as claimed in  claim 12 , wherein the at least one running parameter of the motor is transmitted, monitored and regulated through a remote communication control component.