RU1770886C - Device for electromagnetically checking geometrical parameters of complex-structure objects - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the geometric parameters of elements of complex structures with periodically repeating structures. The goal is to provide selective express control of the protruding structural elements of the object. One of the ECP 2 is installed in the control zone, and the other so that the structural element of the control object does not change its parameters. The power supply unit 1, the frequency voltage frequency control unit 9 and the frequency recorder 8 of the occurrence of structural elements of the object in the control zone provide the ratio t3 -Ј-, Тп - the period of the supply voltage pulses, Хе - the passage time of one protruding structural element of the object in the converter zone . The pulse shaper 10 generates a delay pulse and locks HE 12 and the supply voltage is not applied to the ECPs 2 and 3, and the phase-shifting unit 11 shifts the time interval Tz coming from the shaper 10 to control the first structural element for the time xs. 2 ill. with

Description

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The invention relates to a control and measuring technique and can be used to automatically control the geometric parameters of elements of complex structures with periodically repeating structures (for example, blades of turbine plants, etc.).

A measuring transducer is known for converting active resistances and inductances into voltage, operating on the principle of using integrating commutative circuits.

Also known is a two-dimensional transducer for measuring the imbalance of active resistances and inductances, comprising two inductive type sensors, an integrator connected via a ring switch, an uncontrolled source of rectangular supply voltage, connected to the sensors and a pulse counter, and an output voltage converter into code connected to an integrator.

The closest in technical essence to the claimed device is a device for electromagnetic monitoring of objects selected as a prototype, containing two eddy-current sensors powered by a frequency-controlled power source, the outputs of which are connected to one diagonal of a ring switch, the other diagonal of which is connected with an integrator, the output of which is connected to the measuring unit and with the control input of the pulse counter, the working input of which is connected to the output of a frequency-controlled source Itani, which provides a rectangular voltage of varying frequency, the power supply control unit is realized for the frequency control voltage power source, whose input is connected with the registrar frequency of occurrence of the element structure of the object in the control area ..

However, in the described device, the parameters of only one protruding element are periodically appearing in the control zone.

The aim of the invention is to provide selective express control of the protruding structural elements of the object.

This goal is achieved by the fact that the device for electromagnetic control of the geometric parameters of objects of complex construction, containing two identical eddy current transducers, an integrator, a measuring unit and a pulse counter connected to its output, a ring switch, to which both eddy current transducers are connected to one diagonal, and to the other diagonal - an integrator is connected, and a frequency recorder connected in series to the occurrence of an object structural element in the control zone, the frequency control unit voltage supply and a frequency-controlled power supply output connected to the second input of the pulse meter pulse is equipped with a serially connected time interval shaper, the control input of which is connected to the second output of the frequency-controlling power supply, and the information input is connected to the second output of the frequency recorder by the appearance of the structural element of the object in the control zone, the phase-shifting unit and the logical element NOT, the output of which is connected to the inputs of the eddy current sensors, and the second stroke - connected to the third output of a frequency-controlled power supply.

In FIG. 1 is a functional diagram of a device for electromagnetic control of geometric parameters of objects of complex design; in FIG. 2 shows time diagrams of the peocess control.

A device for electromagnetic control of the geometric parameters of objects of complex construction (Fig. 1) contains a frequency-controlled power supply 1, two identical eddy current transducers 2 and 3, a ring commutator 4, the outputs of eddy current transducers 2 and 3, respectively, are connected to two points of the same diagonal, and the integrator 5 is connected to the other diagonal. A pulse counter 6 and a measurement unit 7 (for example, a digital voltmeter) are connected to the output of the integrator 5, and the frequency recorder 8 is connected in series by the appearance of the structural element of the object in the control zone, the power frequency frequency control unit 9, the output of which is connected to the control input of the power supply 1, as well as the time interval shaper 10, the information inputs of which are connected to the power source 1 to the frequency recorder 8 element of the design of the object in the control zone, the phase shifting unit 11, the input of which is connected to the shaper 10 of the time interval, and the logic element 12 is NOT, the control input of which is connected to the power supply 1, control The developing input to a phase shifter unit 11, and an output connected to an eddy current transducer 2iZ m.

The device operates as follows.

One of the eddy current transducers, for example 2, is installed in the zone at the appearance of the protruding element of the construction of the object, i.e. in the control zone. When an element passes through zone 2, the parameters of this converter change and take values according to the active resistance Г2 go + А g, and according to the inductance 1 + A L, where go is the active resistance of the converter coils, А г - introduced imbalance of resistances; LO - inductance of the converter coils, AL- introduced imbalance of inductance. Another eddy-current transducer 3 is installed in the same temperature and vibration zone so that the structural element of the control object does not change its parameters, i.e. gz go and s LO. Integrator 5 contains two integrating capacities.

A trigger pulse is supplied from the supply voltage frequency control unit 9, which is a voltage to frequency converter. The voltage to block 9 is supplied from the frequency recorder 8 by the appearance of an object structural element in the control zone, which for rotating objects is built on the basis of a tachogenerator. The joint operation of the power source 1, the power frequency frequency control unit 9 and the frequency recorder 8 upon the appearance of the structural element of the object in the control zone provides the following ratio of time intervals:

-.

where Tn is the period of the supply voltage pulses;

ts is the travel time of one protruding structural member of the object in the transducer area. The time at which protruding structural members appear in the transducer zone is shown in Fig. 2a. where Te is the period of passage of the same element along the transducer. M is the number of these elements in a circle. The timing diagram of the supply voltage is shown in FIG. 26. The shaper of the time interval 10 generates a pulse of duration Ts Te

Ja M

which is shown in

FIG. 2c. When this pulse is applied to the control input of the logic circuit NOT 12, the circuit is NOT locked and the supply voltage is not applied to eddy current transducers 2 and 3. Phase shifting unit 11.

either controlled by the operator or automatically, shifts the time interval Tk coming from the driver 10. to control the first structural member by time t3i.

so that ts t31. (figv).

In this case, the eddy current transducers 2 and 3 during the time t3. power is supplied (Fig. 2e) and in the measuring circuit of the device (blocks 2, 3, 4, 5, 6, 7), output parameters are generated in the following manner. After Te, the process is repeated and the formation of output parameters continues until they reach steady-state values.

To control the parameters of the second structural element, the phase-shifting unit 11 provides a shift of the time interval

la at the time of 1zd t3 (

M

(Fig.2-g). In that

In the case similar processes occur, but during this period of time, when the second protruding structural element is in the control zone (Fig. 2-e). For any 1st structural element, it is necessary to provide a shift of the time interval Tk by time.

, + (i- 1)

Jl

M

The formation of the output parameters is as follows. The current And flowing through the circuit of the eddy current transducer 2 and determined by the inductance L LO + AL and the resistance Г2 of the t + А g during the positive pulse of the supply voltage through the circuit through the spear switch 4 charges the first and discharges the second storage capacitance of the integrator 5, and the current la through the winding of the eddy current transducer 3, determined by the inductance Ln and the resistance r, discharges the first and charges the second capacitance of the integrator 5.

Claims (1)

With negative supply voltage pulses, the reverse process occurs. The charge mode of the first storage capacity of the integrator 5 is caused by currents I. 2. and also the voltage Uk-1, where k is the pulse number) formed on this capacity at the beginning of the period under consideration, and the charge of the second capacity of the integrator 5 is caused by the currents b and I. as well as voltage Uk-1. formed on this tank at the beginning of the period under consideration. Impulses of the supply voltage corresponding to the absence of a protruding structural element of the object in the zone of the eddy current transducer 2 do not introduce an imbalance of parameters, since in this case G2 gz, L.2 La Lo the currents li and g are the same, they do not change the voltage by storage capacities of the integrator 5. The transitional mode lasts until the integral values of the charge and discharge currents of the storage capacities of the integrator 5 become equal. After the transition period, the voltage of UU + U is established at the output of integrator 4, where L) is the steady-state voltage at the first storage capacitor, and U1 is the steady-state voltage at the second storage capacitor of integrator 5, Formula of the Invention A device for electromagnetic control of geometric parameters of complex objects a design containing two identical eddy current transducers, an integrator, a measuring unit and a pulse counter connected to its output, a ring switch, to one diagonal of which both eddy current a converter, and an integrator is connected to another diagonal, and a frequency recorder connected in series with the appearance of an object structural element in the zone a control unit for controlling the frequency of the power supply voltage and a frequency-controlled power supply output connected to the second input of the pulse counter, characterized in that, in order to ensure selective express control of the protruding structural elements of the object, it is equipped with series-connected shaper time interval, the control input of which is connected with a second output of a frequency-controlled power source, and the information input is connected to a second output of the frequency recorder by the appearance of an object in the control zone, phase-shifting unit and logic element NOT, the output of which is connected to the inputs of eddy current sensors, and the second input is connected to the third output of a frequency-controlled power supply. a 1 L s d Tz / H t