SU1257418A1 - Device for measuring static torques of rotor blades of turbine-driven machine - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in measuring the static moments of rotor blades of turbomachines. . The aim of the invention is to improve the accuracy and performance of the output by (reducing the time of transitional processes, eliminating non-linearity in the measurement system, and subjective processing errors. The oily damper associated with the rocker arm 5 reduces the installation time, which also contributes b an input of a power amplifier 28 with an output of an operational amplifier. The presence of a data transmission unit in a computer makes it possible to increase the productivity by eliminating a number of manual operations and the accuracy by excluding the subjective 's errors. Lineariziruyuscha coil contributes povsheniyu measuring accuracy since compensates nonlinearity of current in the solenoid in a wide range the measured static moments. 1 yl. On "(A 4i IND ate 4 00

Description

The invention relates to mechanical engineering and to be used in measuring the static moments of rotor blades of turbomachines.

The aim of the invention is to improve the accuracy and performance by reducing the time of transient processes, eliminating nonlinearity in the measurement system and subjective errors in processing the results.

The drawing shows a diagram of a device for measuring the static moments of rotor blades, turboma 11INA.

A device for measuring the static moments of rotor blades of a turbomachine comprises a base 1; placed on it by means of balls 2 supports 3; placed on the flask 1 through racks 21, and the limit switch 22, interacting through the rod 18 with the eccentric 15; a mismatch sensor made5 in the form of a primary winding 23 connected to an alternating current source (not shown) connected to the core Syllah 5 of the core 24 and the secondary winding 25; measuring system

iO made in the form of serially connected operational amplifier 26. two mutually inverse inputs of which through counter-connected diodes 27 are simultaneously connected to both outputs of the secondary winding 25, and 7 of the heater 28 and power adder 29, the second input of which is connected to the output of the operating amplifier Lite. 26, and the output with the input of the solenoors 3, using tant 4, is performed on the 13, additional linearizing from the non-magnetic material of the bobbing coil 30, placed on the symbol 5, equipped with regulators 6 ite and 14 connected and 7 positions the center of mass enshrined in series to the solenoid 13, and

HbiNjH on the shoulders of the rocker arm 5 support bar 8 and the additional prism 9, the axis of the additional prism 9 coincides with the axis of symmetry of the short-shell 5 | placed in the plane of swing of the yoke 5, a mass damper, made in the form of a piston 10, rigidly fixed on the box 1 after 5, and the body 11, fixed on the base 1 by means of an electrically insulating gasket 12; to the Shenzhen system, watered in the form of a microcomputer fixed to the ground by the microcomputer 34, a two-sided thought 5 of the solenoid 13 and a post-magnet 14 fixed coaxially with the solenoid 13 on the base 1; knot of fixing and orientation of the anvil 5, made in the form of stirring on the basis of I with the capacity; turn in the plane, on the hyperendular base of the eccentric 15, drilled along the axis of the rod 16 ,. interacting at the moment of fixation, ai and orientors 45 and 36 and inverse output

Orienting simultaneously with the eccentric 15 by means of the working edge ppm.Sshl 4 of the ball 17 with the rocker 5. second subloading a little along the axis of the rod 18 interacting with the axler 15 and two of the stops 19 with a spherical bearing surface interacting with the supporting bar 8 , an emphasis 20 with the conic surface interacting with an additional prism 9, an emphasis 19 and 20 are made of non-magnetic material and are rigidly told from the foundation 2374182

cue 1 through racks 21, and limit switch 22, interacting through the rod 18 with the eccentric 15; a mismatch sensor made5 in the form of a primary winding 23 connected to an alternating current source (not shown) connected to the core Syllah 5 of the core 24 and the secondary winding 25; measuring system

iO made in the form of serially connected operational amplifier 26. two mutually inverse inputs of which through counter-connected diodes 27 are simultaneously connected to both outputs of the secondary winding 25, and 7 of the heater 28 and power adder 29, the second input of which is connected to the output of the operating amplifier 26 and the output with the input of the salt-connected with the linearizing coil 30 in parallel is X measuring-; i; i; ibHoro of resistor 31, analog-digital converter 32 and dial gauge 33; The data transmission unit in the ICEBM 34, made in the form of a 1 1 multiplexer 35 j inputs, which are connected to the output ;: am 1 of an anapy-digital converter 32, and the outputs - c) with microcomputer 34, two decoder 36 and 37. - whose entrances are connected

The comparator 38 ,, one of the inputs of which is connected to the output of the operational amplifier 26, and the second through the adjustable variable divider 39 - with a stabilized power source (not shown)., two triggers 40 and 41 of the RS type, S-trigger input 40 is connected to the outputs of a two-way comparator 38, a decoder 41, the R-input of the trigger 40 is connected to the output of the NMKpo3BM 34s S-input of the trigger 41 is connected to the output of the trigger 40, and the R-input of the trigger 41 connects the terminal with the end switch 22, the logic element 42 Ш1И-ИЕ, input, which of sv. The outputs are from the decoders 36 and 37 and the trigger 40, and the output is from the input of the microcomputer 34, which are connected in parallel to the logic element 43 AND, VHO, which is connected to the outputs of the decoder 37 and the trigger 41, l of the signal lamp 44.

A device for measuring the static moments of the rotor blades of the turbo-psna operates as follows.

Before measuring the static moments of the blades, the microprocessor 34 loads the program for entering information and processing the measurement results, which performs averaging of several measured values of the static moments of the same blade 45 for accumulating certain values in the microelectronic memory and distributing the blades over the disc grooves, providing access to the data transfer unit in the microcomputer 34. With this, at the output of the microcomputer 34, the signal B b is set to a single state, indicating tion.

The output of the logic element 42 AND-OR-NOT is a tracking information signal (CIP), allowing the microcomputer 34 to enter information, and is formed when there is a single output of the decoder 36 and simultaneously a zero output of the decoder 37 and with a simultaneous single state of the outputs of the decoder 37 and trigger 40 .

The signal 6 b sets the zero state trigger 40, which causes the zero state of the CIP signal, indicating the absence of measurement results, while the trigger 4 is set to one state.

Simultaneously with the signal Bi at the output of the microcomputer, the byte of the information request is set, the high note of which goes to the decoder 36, and the lower one to the decoder 37, and the two junior bits of the lower tetrad simultaneously go to multiplexer 35, at the output of which, in response, sets tetrad.information from incoming to the input of the multiplexer 35 with the anapo-digital converter 32, the number of which in binary form coincides with the younger 35 bits input to the multiplexer input of the lower tetrad of the information request byte. Single values from the outputs of the decoders 36 and 37 are sent to the S input of trigger 40 and to the inputs of logic elements 42 and 43, however, since trigger 41 is in a single state, then trigger 40 is in zero and, therefore, the CIP signal is not generated, while the inputs of the logic element 43 And receive two single signal.

When two single signals arrive at the inputs of the logic element 43 And, the signal lamp 44 lights up, which is the signal for the operator to install the measuring blade 45 on the beam 5. The operator sets the measuring blade 45 and turns the eccentric 15 to release the yokes 5 from the stops 19 and 20 When the eccentric 15 rotates, the limit switch 22 closes, as a result of which the trigger 41 is set to the zero state, and the rocker 5 under the action of the static moment of the blade 45 deviates from the equilibrium position, Ultimately, a signal proportional to the deflection of the rocker arm 5 is set at the output of the secondary winding 25 of the error sensor.

The unipolar half cycles of the output voltage through the diodes 27 are supplied to the direct and inverse inputs of the operational amplifier 26, which amplifies the difference of the output voltages taking into account the sign. The magnitude and polarity of the signal depends on the magnitude and direction of the deflection of the rocker arm 5. Next, the signal enters through the integrator 28 to the power amplifier 29, where it is amplified, and to the solenoid 13 ..

Electromagnetic forces arise between the solenoid 13 and the permanent magnet 14, which tend to return the rocker arm 5 to the equilibrium position, i.e. the state in which there is no signal at the input and, accordingly, at the output of the operational amplifier 26. After the solenoid 13, the signal passes the linearizing coil 30, is fed to the measuring resistor 31 and simultaneously to the analog-to-digital converter 32, where the analog conversion takes place signal into a discrete digital code, for example, a binary-decimal code 1-2-4-8, with each digit of the measurement result represented by one tetrad, the conversion results are fed to the input of multiplexer 35.

From the output of the operational amplifier 26, the signal is also fed to the input of a two-way co.parator 28, which compares the incoming signal with

S

standard 1- {ohm, removed from resistor divider 39. As soon as the difference of the compared signals becomes less than the threshold (sensitivity) of the comparator, a single signal will be set at its output,

. A single signal from the output of the rator enters the S-input of the trigger 40s i. all four signals arriving at the S input of the trigger 40 take on a single value, with the result that the trigger 40 goes into one state. A single signal, the trigger 40 is fed to the logic element 42 I-IPI-NOT, with the result that a zero signal is set at its output, since the outputs of the decoders 36 and 37 are set to one.

The zero output of the logical element 43 AND-OR-NOT is a CIP signal, i.e. signal tracking information entered into the microcomputer, allowing data entry. According to the CIP signal, the microcomputer 34 inputs the tetrad of information that is currently installed at the output of the multiplexer 35, i.e. the first digit of the measurement result

To enter the second and subsequent digits of the measurement result, the bytes of the information request are programmatically incremented by one. In this case, the output of the decoder 37 is set to zero, since the low byte of the request information is different from zero. Available-ie simultaneously on the decoders 36 and 37, respectively, of single and zero values, automatically generates an SIP signal at the output of the AND-OR-NOT logic element 42. At the same time, the two low-order bits of each of the barggy information received by multiplexer 35 initiate the switching of the next tetrad of information after entering the multiplexer 35 from the output of analog-to-digital converter 32, the number of which coincides with the received bits.

Increasing by one the specified number of bytes of information request programmatically, all tetrads of information are read, i.e. all the digits of the measurement result. By incrementing one of the two leading bits of the tetrade of the byte of the information request and repeating the survey of the measurement results again.

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For example, with a specified interval of time exceeding the time of converting an analog signal to a digital one, it is possible to perform a specified number of readings of the measurement result with its subsequent averaging, while reading will be carried out automatically, since the CIP signal is generated by the zero output of the decoder 37 and the unit the output of the decoder 36. After reading a specified number of times of measurement results and averaging them, the microcomputer 34 will be re-accessed to the data transfer unit at zero value

a small tetrade of the request for information, which will lead to the ignition of the signal lamp 44, indicating the need to install a new measurable blade. After measuring and entering the static moments, all the blades will be placed in the disc grooves in the optimal way.

The positive effect is

25

in terms of performance and measurement accuracy. The oil damper significantly snykat time transfer: 5 single processes before installing the rocker arm in a stable position. The tactese and the additional connection of the power amplifier adder 29 from the output of the operating power supply unit 26 contribute to a decrease in transient time, since it significantly increases the balancing current supplied to the solenoid 13 at the initial time; The linearizing coil 30, connected in series to the solenoid 13, increases the measurement accuracy, since it allows to compensate for the nonlinearity between the magnitude of the current of the solenoid and the t - force in a wide range of measured static moments characteristic of a permanent magnet magnetic system. The presence of a data transfer unit in 1-scraper computer allows to significantly increase labor productivity by eliminating such operations (provided that computers are used for blade layout), such as recording data in a measurement protocol, transferring them to computer media, for example, punched cards or punched tape further input into the computer. It is impractical to measure the static moments of the blades without using a computer to lay out them. In addition, the transmission of data in a computer provides for an increase in measurement accuracy as a result of the elimination of subjective errors associated with inaccurate readings and errors in the recording and perforation of measurement results. The decoder in the data transfer unit identifies the high tetrade of the request for information, which is the device’s conditional address, which increases labor productivity, as it allows using one microcomputer to service several devices for measuring static moments by eliminating time associated with servicing several microcomputers instead of one, the second decoder identifies the lower tetrade of the information request byte, which increases the measurement accuracy, since it allows the organization of automatic eskoe reading sleduyupschh several consecutive measurement results (with a time interval, time prevsh1ayushd1M signal conversion from analog to digital form code) Averaging the results of several measurements of one blade virtually eliminates random errors associated with the measurement circuitry and random external influences E.

Claims (1)

Invention Formula Devices for measuring the static moments of the rotor blades of a turbomachine, comprising a base, a support fixed on it, a rocker arm mounted on it by means of a prism, a compensation system including a permanent magnet and a solenoid, a measurement system and a error sensor that is different. so that, in order to achieve accuracy and performance, it is equipped with an oil damper located in the plane of the rocker arm, made in the form of a body fixed on the base by means of an electrically insulating gasket, and a piston connected to the rocker arm, the fixation and orientation unit of the rocker arm in the form of an eccentric located on the base with the possibility of rotation in the plane, perpendicular to the base, of two rods interacting with the eccentric, which are spring-loaded along the axis of the rods, the first of which is intended chen to interact simultaneously with a yoke by a ball disposed in the plane of the working prism edge, mounted on the shoulders of the rocker support bar "and an additional prism, which is located in the plane of swinging of the rocker axis, three rigidly associated with the base by abutment posts, two of which have spherical support surface and are designed to interact with the support bar, and the third has a conical bearing surface and is designed to interact with an additional prism, and a limit switch that interacts through a second rod with an eccentric, and a microelement data transfer unit made in the form of a multiplexer, the first the input of which is intended to be connected to the outputs of the microcomputer, and the output to the inputs of the microcomputer, two decoders, the inputs of which are intended to be connected to the outputs of the microcomputer, two-way comparator, one of the inputs of which is intended to be connected by means of an adjustable resistor divider with a stabilized power source two RS-flip-flops, R-input of the first is designed to connect to the microcomputer, the S-input is connected to the outputs of both decoders, two-way comparator and the inverse output of the second trigger, R input last - with limit switch, S-input - with the inverse output of the first trigger, the I-IHE logic element, the inputs of which are connected to the outputs of the decoders and the first trigger, and the output is intended for connecting to the microcomputer and serially connected logic element I, the first input of which connected to the output of the second descrambler, and the second - with the exit. the second trigger, and the signal lamp, the measurement system is made in the form of a series-connected operational amplifier, two mutually inverse inputs of which are connected via oppositely connected diodes to the two outputs of the error sensor, the integrator and the adder — the power amplifier; the input of which is connected to the output of the operational amplifier and the second input of the two-way comparator, and the output to the solenoid located at pos9125741810 This magnetic magnet of the linearizing roller of the measuring resistor, the external controller, the connected serial indicator and the analog-digital transducer of the solenoid, and connected to the linear generator, the outputs of which are connected eirting coil parallel wkpu-with the second input of the multiplexer.