CN112783055B - Online soft measurement method and device for suspension point load of beam-pumping unit - Google Patents
Online soft measurement method and device for suspension point load of beam-pumping unit Download PDFInfo
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Abstract
The invention relates to a method and a device for online soft measurement of a suspension point load of a beam pumping unit. The measuring method comprises the steps of collecting input active power of a pumping unit system by a measuring and controlling device, and establishing a mathematical model among input electric parameters of a driving motor, fixed parameters of four connecting rods of the pumping unit and a horsehead suspension load of the pumping unit, so that soft measurement of the suspension load of the beam pumping unit is realized. The measurement and control device comprises three working units, namely a beam pumping unit driving motor electrical parameter acquisition unit, a beam pumping unit driving motor electrical parameter processing unit and an output execution unit. The invention can accurately monitor the suspension point load of the beam-pumping unit and effectively overcome the defects of easy interference of working environment, low accuracy of measurement result, additional sensor, inconvenient installation and maintenance and the like in the conventional measurement method.
Description
Technical Field
The invention belongs to the technical field of state monitoring and mechanical recovery efficiency improvement control in an oil field oil recovery production process, and relates to an online soft measurement method and device for a beam pumping unit suspension point load.
Background
The online accurate measurement of the suspension point load of the beam-pumping unit is an important measure for guaranteeing the drawing of a well pump indicator diagram, the analysis of working conditions, the efficiency improvement of a mechanical mining system and the effectiveness of fault diagnosis.
The existing measurement method in the field is a load sensor method, the method has the defects of increasing material and construction cost, increasing operation and maintenance workload and the like due to the fact that a load sensor needs to be additionally arranged on a rack or a polished rod of the oil pumping unit, and is limited by factors such as service life aging of the load sensor and performance coefficient distortion, and the method is poor in stability and low in accuracy.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an online soft measurement method and device for the suspension point load of a beam pumping unit.
The invention relates to an online soft measurement method for suspension point load of a beam-pumping unit, which comprises the following implementation steps:
step one, acquiring an instantaneous voltage value u of a beam pumping unit driving motor through a three-phase voltage detection module and a three-phase current detection module of a beam pumping unit suspension point load soft measurement devicea(t)、ub(t)、uc(t) and instantaneous Current value ia(t)、ib(t)、ic(t), subscripts a, b and c respectively represent a phase a, b phase and c phase electricity in a three-phase alternating current system, after amplification, amplitude limiting, filtering and I/V conversion are carried out by an analog signal conditioning circuit module of a beam pumping unit suspension point load soft measuring device, a real-time phase-combining active power value P (t) input by a driving motor is obtained by calculation of a DSP system module of the beam pumping unit suspension point load soft measuring device according to an instantaneous reactive power theory formula or an instantaneous power definition formula, and then an average active power value P input by the driving motor is obtained by average active power definition calculation1When the driving motor runs, the internal loss is required to be overcome to do work, the efficiency of the driving motor is eta, and the active power P output on the rotating shaft of the driving motor can be calculated by utilizing the formula (1)2，
P2＝ηP1 (1)
Calculating the torque M of the output shaft of the driving motor according to the formula (2)d，
In the formula (2), omega is the angular velocity of the driving motor, nmTo drive the motor shaft rotation speed.
The crank output shaft torque M can be calculated by formula (3)ed，
In the formula (3), n is the stroke frequency of the oil pumping unit, i is the total transmission ratio from the driving motor to the output shaft of the speed reducer,
is the transmission efficiency of the drive motor shaft to the crankshaft, and M is an index (M)d＞0、m＝1， Md＜0、m＝-1)；
Step two, calculating the torque generated by the unit suspension point load on the crank, namely the torque factor by the singlechip system module of the soft measuring device for the suspension point load of the beam pumping unit according to the formula (4)
Wherein the content of the first and second substances,
δ＝180°-ψ-β1 (7)
ψ＝Ω+φ (10)
in the formulas (4), (5), (6), (7), (8), (9) and (10), the four-bar linkage structure is shown in FIG. 1, K is the polar distance, and the center O of the output shaft of the reducer is connected with the center O of the beam support1The distance of (d); k1A foot O from the center B of the beam bearing to the polar distance2And a beam bearing center O1The distance between them; k2A foot O from the center B of the beam bearing to the polar distance2The distance from the center O of the output shaft of the speed reducer; k3The distance from the center B of the beam bearing to the pole pitch; k is4The distance from the center B of the beam bearing to the center O of the output shaft of the reducer; a is the length of a front arm of a walking beam of the oil pumping unit; c is the length of the rear arm of the beam of the pumping unit; r is the crank radius; p is the length of the connecting rod, and the distance from the center of the beam bearing to the center of the crank pin bearing; alpha is an included angle between the connecting rod of the oil pumping unit and the crank; beta is a1The included angle between the connecting line of the center B of the beam bearing and the center O of the output shaft of the speed reducer and the polar distance; beta is a2The included angle between the connecting line of the center B of the beam bearing and the center O of the output shaft of the speed reducer and the radius of the crank; delta is an included angle between a connecting line of a beam bearing center B and a reducer output shaft center O and a rear arm of a beam of the pumping unit; phi is an included angle between the polar distance and the horizontal line; psi is the included angle between the rear arm of the beam of the pumping unit and the polar distance; omega is a walking beam inclination angle which is an included angle between a walking beam front arm and a horizontal line X, the walking beam inclination angle measurement module is used for measuring, when the walking beam front arm is below the horizontal line, the walking beam front arm is a positive value, and when the walking beam front arm is above the horizontal line, the walking beam front arm is a negative value;
step three, for the beam-balanced beam-pumping unit, the single chip system module of the beam-pumping unit suspension point load soft measuring device calculates the suspension point load W according to the formula (11),
in the formula (11), B is a structural non-balancing weight, and Ω is a beam inclination angle.
The invention relates to a soft measuring device for an online soft measuring method of a beam pumping unit suspension point load, which comprises a beam pumping unit driving motor electrical parameter acquisition unit, a beam pumping unit driving motor electrical parameter processing unit and an output execution unit; wherein
The beam-pumping unit driving motor electrical parameter acquisition unit consists of a three-phase voltage detection module, a three-phase current detection module, a beam inclination angle measurement module and a remote signaling detection and locking module;
the electric parameter processing unit of the driving motor of the beam-pumping unit consists of a singlechip system module, a DSP system module, a CPLD logic and combined system module, an analog signal conditioning circuit module, a digital signal conditioning circuit module, a serial communication module, a liquid crystal display module and a keyboard module;
the output execution unit consists of a photoelectric coupler and a control output module;
the output ends of the three-phase voltage detection module, the three-phase current detection module and the beam inclination angle measurement module are respectively connected to the input end of the analog signal conditioning circuit module in the beam pumping unit driving motor electrical parameter processing unit, and the output end of the remote signaling detection and locking module is connected to the input end of the digital signal conditioning circuit module in the beam pumping unit driving motor electrical parameter processing unit;
the output end of the analog signal conditioning circuit module is connected to the input end of the DSP system module, the output end of the digital signal conditioning circuit module is connected to the CPLD logic and combined system module, the DSP system module is connected with the single chip microcomputer system module through a standard SPI bus and is connected with the CPLD logic and combined system module through a general parallel input and output port, the single chip microcomputer system module is connected with the combined system module through a general parallel input and output port and the CPLD logic, the serial communication module is connected with a UART serial port embedded in the single chip microcomputer system module after being isolated by a first magnetic coupler module, the output end of the keyboard module is connected with the input end of the CPLD logic and combined system module after being isolated by a third magnetic coupler module, and the display output end of the CPLD logic and combined system module is isolated by a second magnetic coupler module and then connected with the input end of the liquid crystal display module The inlet ends are connected;
and the control output module is isolated by the photoelectric coupler and then connected with the output end of the CPLD logic and combined system module in the electric parameter processing unit of the driving motor of the beam oil pumping machine.
The invention has the following beneficial effects:
firstly, the method and the device realize the measurement of the suspension point load of the beam pumping unit by monitoring the electric parameters of the driving motor of the pumping unit in real time, are a typical indirect soft measurement method of replacing hard with soft, do not need to additionally add a sensor on a pumping unit system body, do not need to lay a sensor power line and a signal line, reduce the construction cost and are convenient to maintain.
And secondly, the measured performance is not easily influenced by factors such as the service life aging of the load sensor, the performance coefficient distortion and the like, and the reliability and the accuracy are good.
The beam-pumping unit suspension point load soft measurement device has the advantages of obvious functional area, perfect strong and weak current isolation and easy upgrading, is provided with a special communication and man-machine interaction link, and can be directly and seamlessly integrated into a digital oil field management and control platform.
Drawings
FIG. 1 is a four bar linkage structure of the beam pumping unit of the present invention;
the basic parameters and meanings are as follows:
a-the length (m) of the front arm of the walking beam of the oil pumping unit;
c, the length (m) of a rear arm of a walking beam of the oil pumping unit;
h, the height (m) from the center point of the beam support of the pumping unit to the lowest part of the base;
i-horizontal distance (m) from the center of the beam support to the center of the output shaft of the reducer;
k is the polar distance, and the distance (m) from the center of the output shaft of the speed reducer to the center of the beam bearing;
p is the length of the connecting rod, the distance (m) from the center of the beam bearing to the center of the crank pin bearing;
r-crank radius (m);
x-horizontal line (actually absent);
alpha is the included angle (degree) between the connecting rod and the crank of the oil pumping unit;
beta is the included angle (degree) between the rear arm of the beam of the pumping unit and the connecting rod;
θ — crank angle, measured in crank rotation direction (°) with the crank at 12 o' clock position at zero degrees;
phi is the included angle (DEG) of the polar distance and the horizontal line;
omega-inclination of the walking beam, positive when the forearm of the walking beam is below the horizon and negative when the forearm of the walking beam is above the horizon;
psi-the included angle between the rear arm of the beam-pumping unit and the polar distance (degree).
Fig. 2 is a hardware schematic diagram of the suspension point load measuring device of the beam-pumping unit according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings by taking a beam-balanced beam-pumping unit as an example.
The basic content of the online soft measurement method for the suspension point load of the beam-pumping unit is that the real-time three-phase instantaneous input voltage u of a driving motor in a beam-pumping unit system is respectively acquired by a three-phase voltage detection module 1 and a three-phase current detection module 2 of the soft measurement device for the suspension point load of the beam-pumping unita(t)、ub(t)、uc(t) and three-phase instantaneous input current ia(t)、 ib(t)、ic(t), after the amplification, amplitude limiting, filtering and I/V conversion of the analog signal conditioning circuit module 5, the real-time combined active power value P (t) input by the driving motor of the pumping unit is obtained by the calculation of a DSP system module 7 of the beam pumping unit suspension point load soft measuring device according to an instantaneous reactive power theory formula or an instantaneous power definition formula, and then the average active power value P input by the driving motor is obtained by the average active power definition calculation1Calculating the active power P output from the rotating shaft of the driving motor according to the formula (1) in the implementation step of the invention2Root of Chinese characterCalculating the torque M of the output shaft of the driving motor according to the formula (2)dCalculating the equivalent driving torque converted from the output shaft of the driving motor to the crank, namely the crank output shaft torque M by using the formula (3)ed。
The single chip system module 8 of the soft measuring device for the suspension point load of the beam pumping unit calculates the torque generated by the unit suspension point load on the crank according to the formula (4), namely the torque factor
Wherein each unknown parameter can be calculated by the equations (5), (6), (7), (8), (9) and (10), and the desired parameter and its meaning can be obtained in the four-bar linkage diagram of fig. 1.
Torque factor to be calculated
And substituting the formula (11) into a formula (11), and calculating the suspension point load W of the beam-balanced beam-pumping unit by using a single-chip microcomputer system module 8 of the suspension point load soft measuring device of the beam-pumping unit.
The structure of one embodiment of the soft measuring device for the suspension point load of the beam-pumping unit is shown in the attached figure 2, and the soft measuring device consists of three working units, namely a beam-pumping unit driving motor electric parameter acquisition unit, a beam-pumping unit driving motor electric parameter processing unit and an output execution unit, wherein the beam-pumping unit driving motor electric parameter acquisition unit and the output execution unit are respectively connected with the beam-pumping unit driving motor electric parameter processing unit through corresponding interfaces.
The beam-pumping unit driving motor electrical parameter acquisition unit is composed of a three-phase voltage detection module 1, a three-phase current detection module 2, a beam inclination angle measurement module 3 and a remote signaling detection and locking module 4, wherein the output ends of the three-phase voltage detection module 1, the three-phase current detection module 2 and the beam inclination angle measurement module 3 are connected to the input end of an analog signal conditioning circuit module 5 in a driving motor electrical parameter processing unit, and the output end of the remote signaling detection and locking module 4 is connected to the input end of a digital signal conditioning circuit module 6 in the driving motor electrical parameter processing unit.
During operation, the pumping unit distributes powerThree-line voltage in a box feed circuit (namely an electric energy input circuit of a driving motor of the pumping unit) is sent to a three-phase voltage detection module 1 in a direct acquisition mode, three-line current is sent to a three-phase current detection module 2 after being converted by an existing current transformer, a beam inclination angle of the pumping unit is sent to a beam inclination angle measurement module 3 in a direct acquisition mode, and an instantaneous voltage value u of the electric energy input circuit of the driving motor of the pumping unit is obtained after being processed by an analog signal conditioning circuit module 5 in a driving electric parameter processing unit of the beam pumping unit respectivelya(t)、ub(t)、uc(t) instantaneous Current value ia(t)、ib(t)、ic(t) and the inclination angle of the walking beam type oil pumping unit.
In the structural design of the specific example, three parallel voltage transformers (such as HPT304A and HRPT-1) are adopted in the three-phase voltage detection module 1, three parallel current transformers (such as HCT255A and HRCT-1) are adopted in the three-phase current detection module 2, a common inclination sensor is adopted in the walking beam inclination angle measurement module 3, and the remote signaling detection and locking module 4 is directly obtained from auxiliary contact signals of an air switch in the distribution box.
The electric parameter processing unit of the driving motor of the beam-pumping unit consists of a single chip microcomputer system module 8, a DSP system module 7, a CPLD logic and combined system module 9, an analog signal conditioning circuit module 5, a digital signal conditioning circuit module 6, a serial communication module 13, a liquid crystal display module 14 and a keyboard module 15, wherein the output end of the analog signal conditioning circuit module 5 is connected to the input end of the DSP system module 7, the output end of the digital signal conditioning circuit module 6 is connected to the CPLD logic and combined system module 9, the DSP system module 7 is connected with the single chip microcomputer system module 8 through a standard SPI bus and is connected with the CPLD logic and combined system module 9 through a universal parallel input and output port, the single chip microcomputer system module 8 is connected with the combined system module 9 through the universal parallel input and output port and the CPLD logic, and the serial communication module 13 is connected with a UART (universal asynchronous receiver) embedded in the single chip microcomputer system module 8 after being isolated by a first magnetic coupler module 10 The output end of the keyboard module 15 is isolated by the third magnetic coupler module 12 and then connected to the input end of the CPLD logic and combination system module 9, and the display output end of the CPLD logic and combination system module 9 is isolated by the second magnetic coupler module 11 and then connected to the input end of the liquid crystal display module 14.
IN the specific example, IN the structural design, the single chip system module 8 may adopt a digital signal processor (e.g., Dspic30F6014A) with a built-IN multi-channel a/D, the DSP system module 7 may adopt TSM320 series devices (e.g., TSM320F2812), the CPLD logic and combination system module 9 may adopt MAX7000 series devices (e.g., EPM7128), the analog signal conditioning circuit module 5 may be implemented by a filter composed of an I/V conversion and amplification circuit (e.g., RVC420, LM324 and peripheral auxiliary elements), a clamp diode (e.g., IN4148), a limiter regulator tube, and a general capacitor resistor, the digital signal conditioning circuit module 6 may be implemented by a typical limiter and anti-shake circuit composed of a clamp diode (e.g., IN4001), a limiter tube, and a general capacitor resistor, and the three magnetic couplers 10, 11, and 12 may be high-speed magnetic isolation devices (e.g., ADUM 1200).
The output execution unit consists of a photoelectric coupler module 16 and a control output module 17, and the control output module 17 is isolated by the photoelectric coupler module 16 and then connected with the output end of the CPLD logic and combined system module 9 in the drive motor electric parameter processing unit.
In a specific implementation structure, the control output module 17 may adopt a general control relay (e.g., JQX-14) or a solid state relay SSR (e.g., S310ZK), and the photocoupler module 16 needs to adopt a photocoupler (e.g., TLP127) with a large output driving capability.
In actual work, the beam-pumping unit suspension point load soft measurement device samples the electric parameters of the electric energy input loop of the driving motor of the pumping unit through the three-phase voltage detection module 1 and the three-phase current detection module 2, and sends the electric parameters to the DSP system module 7 with a built-in A/D converter for analysis and recording after the electric parameters are amplified, limited, filtered and subjected to I/V conversion through the analog signal conditioning circuit module 5 to obtain an instantaneous voltage value ua(t)、ub(t)、uc(t) and instantaneous Current value ia(t)、ib(t)、ic(t), calculating by the DSP system module 7 according to an instantaneous reactive power theory formula or an instantaneous power definition formula to obtain a real-time phase-combining active power value p (t) input by the driving motor of the pumping unit, and calculating by defining the average active power to obtain the drivingInput average active power value P of motor1And sent to the singlechip system module 8. The beam inclination angle measuring module 3 samples the beam inclination angle of the beam pumping unit, and the beam inclination angle is amplified, limited, filtered and I/V converted by the analog signal conditioning circuit module 5 and then sent to the DSP system module 7 with a built-in A/D converter for analysis, processing and recording, so that the beam inclination angle is obtained and sent to the single chip microcomputer system module 8. The single chip microcomputer system module 8 finally calculates the suspension point load W of the beam pumping unit according to the transmitted parameters and the implementation steps of the invention, and therefore soft measurement of the suspension point load of the beam pumping unit is realized by monitoring the electric parameters of the driving motor of the beam pumping unit in real time.
A keyboard module 15 in the electric parameter processing unit of the driving motor of the beam-pumping unit provides a parameter setting and function selection interface for a user, and the keyboard module and the liquid crystal display module 14 together complete a human-computer interaction function; the CPLD logic and combination system module 9 in the beam pumping unit driving motor electrical parameter processing unit receives key information generated by the keyboard module 15 after being isolated by the first magnetic coupler module 12, performs logic operation and processing to form a control instruction or a control parameter, and then directly transmits the control instruction or the control parameter to the singlechip system module 8 in the beam pumping unit driving motor electrical parameter processing unit so as to set an operation parameter of the suspension point load soft measurement system.
The auxiliary contact of the air switch in the distribution box of the oil pumping unit is directly connected to the remote signaling detection and locking module 4, so that the working state of the switch can be remotely monitored by workers.
The device of the invention carries out the process of online soft measurement of the suspension point load of the beam pumping unit as follows:
1) powering on a system, self-checking and initializing;
2) checking whether the system of the device has faults, switching to a corresponding processing program when the system has faults, giving fault diagnosis prompt information, and executing the step-down when the system has no faults;
3) continuously acquiring three-phase current and three-phase voltage instantaneous values of a feed branch of a distribution box of the pumping unit, and acquiring a beam inclination angle value omega of the beam pumping unit;
4) calculating a real-time resultant active power value p (t) fromAnd obtaining the average active electric power measured value P of the input of the driving motor1；
5) Calculating the torque M of the output shaft of the driving motordThereby calculating the torque M of the crank output shafted；
6) Calculating a torque factor
7) Calculating the suspension point load W of the beam-balanced beam-pumping unit;
8) repeating the steps 2) to 7).
The basic principle, the main characteristics and the advantages of the invention are described through the above description and the embodiments, and particularly the essence of the invention is shown, namely the torque of the crank output shaft is calculated through real-time acquisition, processing and calculation of the input active power of the pumping unit driving motor, and the torque factor is obtained through the analysis of the four-bar linkage mechanism, so that a mathematical model among the input electric parameters of the driving motor, the four-bar linkage fixed parameters of the pumping unit and the pumping unit horse head suspension point load is established, and the soft measurement of the suspension point load of the beam pumping unit is realized.
The practical application of the present invention is not limited by the above-mentioned embodiments, and the present invention may have various changes and modifications (such as a soft measurement method of the suspension point load of the compound walking beam pumping unit improved based on this method) without departing from the gist of the present invention, and these changes and modifications are all within the scope of the present invention, and the scope of protection can be defined by the claims and the equivalents thereof attached to the present application text.
Claims (9)
1. An on-line soft measurement method for a suspension point load of a beam pumping unit is characterized by comprising the following implementation steps:
step 1, collecting instantaneous voltage value u of beam-pumping unit driving motor through three-phase voltage detection module and three-phase current detection module of beam-pumping unit suspension point load soft measurement devicea(t)、ub(t)、uc(t) and instantaneous Current value ia(t)、ib(t)、ic(t), subscripts a, b and c respectively represent a phase a, b phase and c phase electricity in a three-phase alternating current system, a DSP system module of a beam pumping unit suspension point load soft measurement device calculates and obtains a real-time resultant active power value P (t) input by a driving motor, and then an average active power definition calculation is carried out to obtain an average active power value P input by the driving motor1Calculating the active power P output on the rotating shaft of the driving motor according to the formula (1)2Wherein eta in the formula (1) represents the efficiency of the driving motor,
P2＝ηP1 (1)
calculating the torque M of the output shaft of the driving motor according to the formula (2)d，
In the formula (2), ω is the angular velocity of the driving motor, nmFor driving the rotational speed of the motor shaft;
calculating the crank output shaft torque M according to the formula (3)ed，
In the formula (3), n is the stroke frequency of the oil pumping unit, i is the total transmission ratio from the driving motor to the output shaft of the speed reducer,
is the transmission efficiency of the drive motor shaft to the crankshaft, M is an index, where M is the number of revolutions per minutedWhen the value is more than 0, m is 1; when M isdWhen less than 0, m is-1;
step 2, calculating the torque generated by the unit suspension point load on the crank, namely the torque factor by the singlechip system module of the soft measuring device for the suspension point load of the beam pumping unit according to the formula (4)
Wherein, the first and the second end of the pipe are connected with each other,
δ＝180°-ψ-β1 (7)
ψ＝Ω+φ (10)
in the formulas (4), (5), (6), (7), (8), (9) and (10), K is the polar distance from the reducer output shaft center O to the walking beam bearing center O1The distance of (a); k1A foot O from the center B of the beam bearing to the polar distance2And a beam bearing center O1The distance between them; k is2A foot O from the center B of the beam bearing to the polar distance2The distance from the center O of the output shaft of the speed reducer; k3The distance from the center B of the beam bearing to the pole pitch; k4The distance from the center B of the beam bearing to the center O of the output shaft of the reducer; a is the length of the front arm of the walking beam of the oil pumping unit; c is the length of the rear arm of the beam of the pumping unit; r is the crank radius; p is the length of the connecting rod, and the distance from the center of the beam bearing to the center of the crank pin bearing; alpha is an included angle between the connecting rod of the oil pumping unit and the crank; beta is a beta1Is the center of a beam bearingB, an included angle between a connecting line of the output shaft center O of the speed reducer and the polar distance K; beta is a2The included angle between the connecting line of the center B of the beam bearing and the center O of the output shaft of the speed reducer and the radius R of the crank is formed; delta is the included angle between the connecting line of the center B of the cross beam bearing and the center O of the output shaft of the reducer and the rear arm of the walking beam of the pumping unit; phi is an included angle between the polar distance K and the horizontal line X; psi is an included angle between a rear arm of a walking beam of the pumping unit and the polar distance K; omega is a walking beam inclination angle which is an included angle between a walking beam front arm and a horizontal line X, the walking beam inclination angle is measured by a walking beam inclination angle measuring module, when the walking beam front arm is below the horizontal line X, the walking beam front arm is a positive value, and when the walking beam front arm is above the horizontal line X, the walking beam front arm is a negative value;
step 3, calculating the suspension point load W by a single chip microcomputer system module of the soft measuring device of the suspension point load of the beam pumping unit according to a formula (11),
in the formula (11), B is a structural non-balancing weight, and Ω is a beam inclination angle.
2. The soft measuring device of the online soft measuring method of the suspension point load of the beam pumping unit according to claim 1, characterized in that the soft measuring device comprises a beam pumping unit driving motor electrical parameter acquisition unit, a beam pumping unit driving motor electrical parameter processing unit and an output execution unit; wherein
The electric parameter acquisition unit of the driving motor of the beam-pumping unit consists of a three-phase voltage detection module, a three-phase current detection module, a beam inclination angle measurement module and a remote signaling detection and locking module;
the electric parameter processing unit of the driving motor of the beam pumping unit consists of a singlechip system module, a DSP system module, a CPLD logic and combination system module, an analog signal conditioning circuit module, a digital signal conditioning circuit module, a serial communication module, a liquid crystal display module and a keyboard module;
the output execution unit consists of a photoelectric coupler and a control output module;
the output ends of the three-phase voltage detection module, the three-phase current detection module and the beam inclination angle measurement module are respectively connected to the input end of the analog signal conditioning circuit module in the beam pumping unit driving motor electrical parameter processing unit, and the output end of the remote signaling detection and locking module is connected to the input end of the digital signal conditioning circuit module in the beam pumping unit driving motor electrical parameter processing unit;
the output end of the analog signal conditioning circuit module is connected to the input end of the DSP system module, the output end of the digital signal conditioning circuit module is connected to the CPLD logic and combined system module, the DSP system module is connected with the singlechip system module through a standard SPI bus, meanwhile, the CPLD logic and combined system module is connected with the CPLD logic and combined system module through a general parallel input/output port, the single chip microcomputer system module is connected with the combined system module through a general parallel input/output port and the CPLD logic, the serial communication module is connected with the UART serial port embedded in the singlechip system module after being isolated by the first magnetic coupler module, the output end of the keyboard module is connected with the input end of the CPLD logic and combination system module after being isolated by a third magnetic coupler module, the display output end of the CPLD logic and combination system module is connected with the input end of the liquid crystal display module after being isolated by a second magnetic coupler module;
and the control output module is isolated by the photoelectric coupler and then connected with the output end of the CPLD logic and combined system module in the electric parameter processing unit of the driving motor of the beam pumping unit.
3. The device for soft measurement of the suspension point load of the beam-pumping unit on line as claimed in claim 2, wherein the three-phase voltage detection module adopts three parallel voltage transformers, and the three-phase current detection module adopts three parallel current transformers.
4. The soft measuring device of the online soft measuring method of the suspension point load of the beam-pumping unit according to claim 2, characterized in that the analog signal conditioning circuit module is realized by a filter composed of an I/V conversion and amplification circuit, a clamping diode, a limiting voltage regulator tube and a general resistance-capacitance device.
5. The soft measuring device of the online soft measuring method of the suspension point load of the beam-pumping unit according to claim 2, characterized in that the digital signal conditioning circuit module is realized by a circuit consisting of a clamping diode, a limiting voltage regulator tube and a general capacitor resistance device.
6. The device for the on-line soft measurement of the suspension point load of the beam-pumping unit as claimed in claim 2, characterized in that the single chip microcomputer system module adopts a digital signal processor with a built-in multi-path A/D.
7. The device for the on-line soft measurement of the suspension point load of the beam-pumping unit according to claim 2, wherein the DSP system module adopts TSM320 series devices.
8. The soft measuring device of the online soft measuring method of the suspension point load of the beam-pumping unit according to claim 2, characterized in that the first magnetic coupler, the second magnetic coupler and the third magnetic coupler are high-speed magnetic isolation devices.
9. The device for the on-line soft measurement of the suspension point load of the beam-pumping unit according to claim 2, wherein the CPLD logic and combination system module employs MAX7000 series devices.
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