Method to control vibrosieve drive system

FIELD: process engineering.

SUBSTANCE: invention relates to oil-and-gas industry and can be used to control drive system of vibrosieves with elliptical trajectory of frame oscillations, the frame being made up of two unbalanced exciters. Proposed method comprises varying phase shift between misbalance turn angles be affecting unbalanced exciter motors. Revolution cycle of first unbalanced exciter and time interval wherein exciters pass identical positions are constantly measured. Then phase shift between turn angle is calculated by mathematical relation. Thereafter, difference between obtained value and vibrosieves design rating is determined to vary acting voltage fed to one of motors of exciters so that said difference reduces to zero. If sign of obtained difference corresponds to that of rotation of the first exciter, then voltage fed to its motor is reduced. If sings do not match, voltage fed to motor of the second exciter is reduced. Further, control is performed by varying fed voltage to motors. If changed voltage reaches main voltage, then another motor actual voltage is decreased.

EFFECT: higher efficiency and capacity.

7 dwg

 

The method applies primarily to the oil and gas industry and can be used to control the drive system of drilling shale shakers with linear or elliptical trajectory oscillations of the frame, consisting of two unbalanced exciters.

Closest to the claimed method is a method of synchronization control system drives shale shakers (A.S. 1264998 the USSR, IPC7WV 1/40. The method of controlling the synchronization of a dynamical system / Trubitsyn VG, Blekhman I.I., Usenet A.S., Polotsk, VA, Pecheneg AV, Todorov B.C., Rozhkov V.A.).

The disadvantage of this method is the heterogeneity of trajectories oscillations along the length of the mesh vibrating screens, which reduces its capacity. Self-synchronization of unbalance exciters is only a necessary condition for the operation of vibrating screens. For effective screening of drilling mud requires that the trajectory oscillations in all grid points would be the same.

An object of the invention is the improvement of the capacity of vibrating screens throughout time by continuously maintaining the same trajectory oscillations of the frame at all points along the length of the grid.

The technical problem is solved by the proposed method, the control system drives the vibrating screens of the two unbalance exciters, including the non change of the phase shift between the rotation angles of the non-balances by stimulation of the motor, in which constantly measure the turnover time of the first unbalance and the time interval between the passage of the first and second non-balances the same provisions, then calculate the phase shift αandbetween the rotation angles of the non-balances according to the formula

where Δtaboutthe time of one revolution of the first unbalance; ∆ Tvarious- the time interval between the moments of passage of the non-balances of the same provisions; and then determine the difference between the value received and the value of phase shift of a given design shakers, and change the effective value of voltage applied to one of the engines of unbalance exciters so that this difference was reduced to zero. If the original sign of the received difference coincides with the sign of the direction of rotation of the first unbalance, then reduce the effective value of voltage applied to the engine, if the signs do not match, then reduce the effective value of voltage applied to a motor of the second unbalance exciter. In the future if changing the effective voltage value reaches the current value of the mains voltage, then begin to reduce the effective value of the voltage on the engine of another unbalance exciter.

Trajectory oscillations at all points of the frame when rotating the attachment of non-balances in different directions will be the same for any form of trajectories, including elliptic, if two conditions that prevent angular oscillation of the frame shakers. The first condition is in compliance with equality (see U.S. Pat. for useful model №46686)

where mi, εimass and eccentricity of the unbalance of the i-th agent (i=1, 2);

ridistance from the center of gravity librarymy Assembly to the center of the rotation unbalance of the i-th agent.

The second condition follows from the expressions for the phase shift α between the rotation angles of the non-balances (see the book of Blekhman I.I. Synchronization of mechanical systems. - M.: Nauka, 1971, formula (16.12) str)

where σ2- mark direction of rotation unbalance of the second vibration exciter;

δ1, δ2- the angles between the horizontal and the beam coming out of the center of gravity of the frame and passing through the center of rotation respectively the 1st and 2nd of unbalance exciters;

Md, MC1- motor torque and drag torque on the shaft of the first unbalance of the vibration exciter;

- vibrating moment shakers.

The minus sign introduced us to the formula (3) to reconcile the positive direction of the reference angles generally accepted in mathematics, as in the book positive direction taken clockwise, i.e. in protivopolojna the m direction.

The second condition that prevents angular oscillation of the frame shakers, is in compliance with the equality to zero of the excess torque ΔM1=Md-MC1=0 in the first unbalance vibration exciter, which automatically gives equality to zero of the excess torque on the second unbalance vibration exciter. Therefore, the phase shift between the rotation angles of the 1st and 2nd non-balances specified design shakers equal

Because direct measurement of excess very difficult task, then, after determining the current value of the phase shift between the rotation angles of the non-balances and comparing it with the value of phase shift of a given design shakers, we can indirectly measure the value of the excess moment, and then running the engine corresponding unbalance exciter to reduce it to zero.

Conditions of self-synchronization of the rotation unbalance excitersit is easier to achieve not running their motors, as described in the prototype, and the increase in the parameters r1, r2in the design of vibrating screens.

Installing even a new unbalance exciters to the vibrating requires their pairwise assignments due to the different mechanical characteristics of induction motors and different moments of resistance on their shafts. In x is de operation of the moments of resistance change significantly over time due to wear of the bearings and change the status of grease in them. The shale shakers with elliptical trajectories of unbalance exciters fundamentally have significantly different values of the parameters of the non-balances mi·εithat automatically gives different moments of resistance on their shafts, and hence a non-zero excess moments. Therefore, the proposed method control system actuators vibrating screens necessary for the efficient operation of the shale shakers.

The proposed method was tested on the experimental setup presented in figure 1, 2, 3. Figure 4 shows the functional diagram of the system created for testing the proposed method, the control system drives the vibrating screens. Figure 5 shows the locations of the 1st and 2nd non-balances at the time of passing the first position, corresponding to its zero angle. Figure 6 shows the locations of non-balances at the time of passing of the second of these provisions, corresponding to its zero angle. 7 shows the trajectory oscillations of the frame at points a, b and C, corresponding to the edges and the center of the grid, and above a horizontal straight line trajectories recorded during the shakers without control system drives shakers, below the line when the shakers management system drives shakers of the proposed method.

Experimental setup figure 1 is a vibrating screen that contains the OS is Finance 1, installed the receiver mud 2 and tray sifted solution 3. Frame shakers 4 is suspended on the spring 5, is fixed on the base 1, and has a mechanism for adjusting the angle 6. On the frame shakers 4 fixed grid 7 and installed yoke 8, which has two unbalanced the vibration exciter 9 and 10. The first 9 of them equipped with a position sensor unbalance 11, the second 10 - position sensor unbalance 12. To control the shapes of the trajectories of the oscillations on the sidewall 13 librarymy 4 marked points a, b and C, corresponding to the edges and the center of the grids. More installation of the position sensor 11 shown in figure 2 and 3. It is installed in the bore of the casing 14 of 1st unbalance of the vibration exciter 9 in the place corresponding to the zero angle of unbalance 15. On the balance weight 15 on the axis of symmetry of the pasted strip of reflective material 16. On the 2nd of unbalance vibration exciter 10, the eccentric weight which in figure 4 is indicated by position 17, position sensor 12 is installed in the same way. As position sensors used optocoupler consisting of a led and a photodiode. As position sensors non-balances also successfully tested electromagnetic contactless limit switches, for which instead of strips of reflective material on the non-balances mechanically fastened metal blinds. The output signals of the sensor is in the position of non-balances 11 and 12 in figure 4 is connected to the input port of the programmable microcontroller 18, and to the output port of the controller connected four-digit seven-segment led indicator 19. This controller is designed for continuous measurement of turnaround time 1st unbalance, the time interval between the moments of passage of the non-balances the 1st and 2nd of unbalance exciters their null positions and calculating a phase shift between the rotation angles of the non-balances according to the formula (1), and output values of the phase shift and the periodic output of measured values of the time intervals on the indicator 19. The motor 20 of 1st unbalance exciter and 21 of 2nd unbalance exciter is connected to line voltage through a non-contact actuators 22 and 23. As power switches in these starters are used Optimiser. The output port of the programmable microcontroller 24 is connected to the LEDs optimistion contactors 23 and 22 through amplifiers 25 and 26. To the input ports of the controller 24 is connected keyboard 27 and the pulse shaper beginning of the half cycles of the phase voltages of the network 28. The controller 24 and the imaging unit 28 form a software-implemented system of pulse-phase control openimscore contactors 22 and 23, and the keyboard 27 is used to select the controlled motor and the input values of the time delay opening optimistion contactors 22 and 23 relative to the imp shall sow the beginning of the half-wave phase voltage network, what is the equivalent to setting the opening angle of optoelectron.

The testing method of the synchronization control system actuators vibrating screens carried out on the vibrating screen SWAM with elliptical trajectory librarymy. The design of this vibration screen, which corresponds to condition (2) and has design parameters: δ1=1,06 rad (61°), δ2=0,86 rad (49°). The rotation of the non-balances were made in different directions, and the rotation of the 2nd unbalance occurred clockwise (σ2=-1). The phase shift between the rotation angles of the non-balances, specified by design vibrating screens with zero excess time according to the formula (4) is equal to αass=-1,92. To control the shapes of the trajectories at points a, b and C on the sidewall 13 glued the leaves of paper and working on the shaker to them has been fixed pencil.

After the end of acceleration of vibration screen using the controller 18 continuously measured turn-around time debalance 15 of 1st unbalance exciter 9 and the time interval between the moment of passing 1st eccentric weight 15 of his position sensor 11 and the passage of the 2nd eccentric weight 17 of his position sensor 12. Then by the formula (1) controller 18 was calculated measured value of phase shift and displayed on the indicator 19, which in this case was equal to αand=-2,16 of radian. The indicator 19 is periodically displayed as values in the time of the turnover of the 1st unbalance (41.5 MS) and the time interval between the moments of passing non-balances its sensors provisions (14.3 MS). The provisions of the two non-balances 15 and 17 in these moments of time are shown in figure 5 and 6. The difference between the measured value of the phase shift and the value of the phase shift, given the design of the shakers, was equal to Δα=αandαass=-0,24 of radian. Trajectory oscillations of the frame at points a, b and C recorded on paper and shown in Fig.7 above the horizontal line, where you can see a significant difference in their form. Since the sign of the difference between the phase shift Δα coincides with the sign of the direction of rotation of the 1st unbalance, in accordance with the proposed method should reduce the effective value of voltage applied to the phase windings of the motor of the 2nd unbalance exciter 21. To do this, using the keypad 27 was introduced in the microcontroller 24 number 2 corresponding to the engine 22 of 2nd unbalance exciter 10. After that the keyboard 27 in the microcontroller 24 has introduced the value of the time delay opening optimistion contactless starter 23 relative to the pulses of the beginning of the half-wave phase voltage and the indicator 19 observed measured value of phase shift. Changing the values of the time delay opening optimistion contactless starter 23, has made zero difference Δα. It failed when the value of the time delay, equal to 4.1 MS, and the current value of the phase voltage to the motor 21 of the 2nd d is balanced exciter 10 decreased from 214 to 176 C. After that was fixed with a pencil on paper trajectory oscillations of the frame at points a, b and C, which are shown in Fig.7 below the horizontal line. As can be seen in Fig.7. these trajectories are almost the same, which proves that the solution of a technical problem.

The method of controlling the drive system shakers of the two unbalance exciters, including changing the phase shift between the rotation angles of the non-balances by stimulation of the motor unbalance exciters, characterized in that constantly measure the turnover time of the first unbalance and the time interval between the moments of passage of the non-balances the same provisions, then calculate the phase shift between the rotation angles of the first and second non-balances according to the formula

where Δtaboutthe time of one revolution of the first unbalance; ∆ Tvarious- the time interval between the moments of passage of the non-balances of the same provisions; and then determine the difference between the value received and the value of the phase shift given by the design of vibrating screens and change the effective value of voltage applied to one of the engines of unbalance exciters, so that this difference was reduced to zero, and if the original sign of the received difference coincides with the sign of the direction of rotation is, I can pay tithing unbalance, then reduce the value of the voltage supplied to the engine, if the signs do not match, then reduce the value of the voltage applied to a motor of the second unbalance exciter, and further control is made by changing the value of the voltage applied to the selected engine, and if changing the voltage reaches the operating voltage value, then begin to reduce the effective value of the voltage on the engine of another unbalance exciter.



 

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