SU1589258A1 - Method of controlling resonance conditions of debalance vibration machine - Google Patents

Abstract

THE INVENTION IS RELATED TO VIBRATION TECHNIQUE, IN PARTICULAR TO THE METHODS OF DEVELOPMENT OF THE INSTITUTIONAL DEVELOPMENT VIBRATION MACHINES, AND CAN BE USED IN VIBRATION MACHINES DEVICES VIBRATION MACHINES, EXAMPLE VIBRATED OR ARCH DEVELOPERS, VENTIONAL DEVICES, DEVICES, DEVICES, VIBRATION MACHINES, VIBRATION FORMERS, VERSATILE ARCHAGRAPERS, VIRTUAL INGRADERS, VENTIONAL DEVICES, VIBRATION MACHINES, VIBRATION DEVICES, VENTIONAL DEVICES, VIBRATION DEVICES, VIBRATING MACHINES, VIBRATING DEVICES. PURPOSE OF THE INVENTION - ELIMINATION OF THE OPPORTUNITY OF A DRAIN OF A RESONANT REGIME. This is achieved by that the proposed method comprises MEASUREMENT ANGLE unbalanced SHAFT AND TURNING DRIVE unbalance, measure the difference between the angle of rotation of the unbalanced shaft and the DOSE VIBRATIONS OF THE BODY vibration machines, the transmission of the unbalance is switched on or left on when difference values Ξ LYING IN THE INTERVAL FROM - * 98P to И °, AND TURN OFF OR REMOVE TURNED OUT AT THE DIFFERENCE НОСТИ, LYING IN THE INTERVAL FROM Ξ ° TO * 98P, AND WHEN ЗА ° SELECTED IN THE CURRENT PLAY PROGRAMMAN MAKE PROGRAMMET MAKING PROGRAMS PLAY PROGRAMS MAKING PROGRAMS PLAY , AND THE BEGINNING OF THE COUNT OF THE PHASES IS SELECTED BY THE MATTERS UNDER THE SYNTHASE REGIME. 2 IL.

Description

The invention relates to vibration technology, in particular, to methods for controlling vibration machines, and can be used in drive devices for vibration machines, for example, vibrating screens used in the mineral processing industry, to increase their productivity. At the present-day level of the pa: the vibration technique arises the need to use

intensive resonant mode. vibrations of the working body, which implies the need to stabilize this mode.

The purpose of the invention is to eliminate the possibility of disrupting the resonant mode.

Figure 1 presents the block diagram of the device that implements the proposed method; FIG. 2 is a diagram of a model of a vibration machine equipped with

a device for implementing the method of controlling the resonant mode.

The device consists of a rotation angle sensor 1 of the unbalance shaft, a vibration sensor 2, a phase detector 3, an adder 4, a constant signal generator 5 and a power unit 6. The power unit 6 may be, for example, a thyristor unit whose output is connected to an electric motor.

The method is implemented as follows.

The electrical signals produced by the unbalanced shaft rotation angle sensor 1 and the vibration sensor 2 are fed to the inputs of the phase detector 3, where a signal j is generated proportional to the difference between the rotation phase of the unbalanced shaft and the phase of vibration that goes to the input of the adder 4. from the generator 5 constant signal. A generator 5 of a constant signal generates a predetermined electrical signal of the same voltage as the phase detector 3 if the phase difference is O If, in particular, the generator of a constant signal can generate a predetermined electrical signal corresponding to phase difference G / 2; At adder 4, the signal subtracted from the phase detector 3 and the signal from the generator 5 of the constant signal is subtracted. As a result of the subtraction, on the output of the adder 4, a positive signal is generated if the difference between the phase of rotation of the unbalanced shaft and the phase of vibration is smaller, and a negative signal if greater. From the output of the adder 4, the signal is fed to the input of the power unit 6. A negative signal at the input locks the power unit - (i.e., a zero voltage is generated at its output), and a positive one opens it (i.e., at the output of the power unit mains voltage).

The model consists of a working body 7, which is two separate masses interconnected by shock absorbers 8 and with a fixed base 9 — a system of soft vibration insulation 10, mounted on one of the masses of tray 1 and on the other and

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masses of unbalance shaft 12 connected to an asynchronous electric motor (not shown), as well as devices for controlling the resonant mode (in Fig. 2, only the angle sensor 1 of the expansion shaft and the vibration sensor 2 are shown).

The stiffness C of the shock absorbers 8 and the masses t and t of the parts of the working body 7 are selected in such a way that the natural frequency of oscillation Vc / m, + C / m approximately coincides with the nominal frequency OJ of the engine rotation.

The sensor 1 of the angle of rotation of the unbalance shaft, located on one of the masses of the working body 7, is set in such a way that the direction of the vector - eccentricity of the unbalance on the other mass of the working body 7 corresponds to a zero angle of rotation. The vibration sensor is installed in such a way that it measures the vibration of one mass of the working body 7, on which the unbalance shaft 12 is mounted, relative to the other mass, i.e. the difference between the coordinates of these masses

When the unbalance shaft 12 rotates, unbalanced forces arise that vibrate both masses of the working element 7. The unbalanced shaft rotation angle sensor 1 and the vibration sensor 2 produce electrical signals, the processing of which ultimately leads to switching off - turning on the electric motor, which causes the unbalance shaft to rotate. Thus, the mechanical system of the vibration machine closes the feedback from the final link of the device - power unit 6 to the initial links m - sensor 1 of the angle of rotation of the unbalanced shaft and the vibration sensor 2. As a result, a stable resonant mode of vibration of the working body 7 is realized, which does not break when external effects, under normal conditions leading to the breakdown of resonance: when bulk (processed) material is poured into tray 11; at short-term de-energization of the entire installation.

When the voltage of the constant signal produced by the generator 5 of the constant signal, corresponding to the detuning of 7Г / 2, the resonant amplitude is maximum. When reducing or increasing this voltage to the values of the detuning, respectively, O or I

The DG resonant amplitude decreases down to the resonance frequency.

Direct measurement of the skewing in the proposed method makes it possible to avoid a number of measurement errors, thereby increasing reliability compared with the prototype.

In the proposed method, there is no need to use electrical signals proportional to the design parameters of the circuit, which simplifies the control and increases its reliability, since errors in determining these parameters do not occur.

Claims (1)

Formula invented and The control method of the resonant mode unbalanced vibration machine, including the change of the angle nor 1589258 0 five Gate of the unbalance shaft, as well as turning on and off the debalance drive, characterized in that, in order to eliminate the possibility of disrupting the resonant mode, the oscillation phase of the operating element of the vibrating machine is measured, the difference between the angle of rotation of the unbalanced shaft and the oscillation phase of the operating element is measured. vibratory machine, while the drive unbalance include or leave included when the difference value lying in the interval the differences -G from - to, and off or left off when the difference values of P lie in the interval from  to 1G, with f being chosen in advance arbitrarily from the interval from O to a, the origin of the phases is chosen to coincide in the in-phase mode. 1 /////////////////// ///////////////// FIG. g X