CN108204887A - A kind of crop leaf measuring platform - Google Patents

Abstract

The invention provides a blade detection platform, comprising: a motor, a blade, an optical fiber sensor, a photoelectric converter, a laser transmitter, and a processor; there is a counterweight hole on the blade, which is used to install a counterweight to change the load and natural frequency; the motor is connected to the blade to drive the blade to rotate; the photoelectric converter is connected to the processor; the laser emitter is used to emit to the blade tip of the blade when the blade rotates Laser; optical fiber sensor, used to receive the light signal reflected by the blade tip, convert the received light signal into a modulated light signal, and then transmit the modulated light signal to the photoelectric converter; processor, used to receive the light signal sent by the photoelectric converter The electric signal is analyzed, and the operation status of the blade under the current load is determined by analyzing the electric signal. The embodiments of the present invention adopt blades with counterweight holes to achieve the effect of changing the natural vibration frequency of the blades and simulating blades with different parameters and different excitation loads without disassembling the entire blade.

Description

A blade detection platform

technical field

The invention relates to a blade detection platform.

Background technique

The blade is the working part of the turbine, known as the heart of the large rotating unit, its operating condition directly determines the efficient, safe and stable operation of the unit, therefore, it is necessary to test the operating condition of the blade. By testing blades with different load parameters, suitable blades can be selected for production or use. However, in actual operation, it is impossible to test the working blades, and the actual operation of the blades can only be simulated through the blade detection platform.

The current blade testing platform is difficult to adjust the blade excitation load and change the detuning state of the blade. Therefore, when it is necessary to test blades with different excitation load parameters, the experiment can only be continued by replacing the blade. However, it is cumbersome to replace the blades on the blade testing platform. Moreover, if the blades with different load parameters have not been produced, the test cannot be carried out. If the test is required, the blades with new load parameters need to be remade, or the existing blades must be processed and improved. .

Apparently, the existing blade detection platform has high operational complexity, low efficiency, and high test cost for blade operation detection.

Contents of the invention

In view of this, an embodiment of the present invention provides a blade testing platform for improving testing efficiency and reducing testing costs.

In the first aspect, a blade detection platform is provided, including a motor, a blade, an optical fiber sensor, a photoelectric converter, a laser transmitter, and a processor;

There are counterweight holes on the blades for installing counterweights; the motor is connected to the blades to drive the blades to rotate; the photoelectric converter is connected to the processor;

The laser emitter is used to emit laser light to the blade tip of the blade when the blade rotates, and the number of channels of the laser emitter is not less than four; generally, in the non-contact detection method, The vibration information obtained by receiving the information of more than four reflected lights is more accurate.

The optical fiber sensor is connected with the photoelectric converter, and is used to receive the light signal reflected by the blade tip, convert the received light signal into a modulated signal light, and then transmit the modulated light signal to the photoelectric converter ;

The photoelectric converter is used to receive the modulated optical signal, convert the received modulated optical signal into an electrical signal, and transmit the electrical signal to the processor;

The processor is configured to receive the electrical signal sent by the photoelectric converter, and determine the operating status of the blade under the current load by analyzing the electrical signal.

Optionally, an electromagnetic exciter is also included;

The electromagnetic exciter is composed of a coil and a silicon steel sheet, placed on the periphery of the blade, and is used to apply an alternating load to the blade when the blade rotates;

Optionally, a permanent magnetic exciter is also included, and the permanent magnetic exciter is placed on the periphery of the blade for applying a constant excitation force to the blade when the blade rotates.

Optionally, the counterweight is a magnetic counterweight, which can be used to adjust the magnitude of the exciting force. At the same time, it also has the function of changing the natural frequency of the blade by the general counterweight, and adjusts the detuning state of the blade by changing the natural frequency of the blade.

Optionally, a power amplifier power supply is also included;

The power amplifier power supply is connected to the electromagnetic exciter for supplying power to the electromagnetic exciter;

The processor is connected with the power amplifier power supply, and is used for controlling the current output from the power amplifier power supply to the electromagnetic exciter.

Optionally, a blade guard covering the blade is also included.

Optionally, a frequency converter is also included, and the frequency converter is used to adjust the frequency of the current input to the motor.

Optionally, a control cabinet is also included. The control cabinet houses the display, the frequency converter, the laser transmitter, and the processor.

In the second aspect, a blade testing platform is provided, including a motor, a blade, a strain gauge and a processor;

There are counterweight holes on the blades for installing counterweights; the motor is connected to the blades to drive the blades to rotate; the strain gauges are installed on both sides of the tip of the blades; the A connection wire is connected to the strain gauge; the connection wire is connected to the processor through the slip ring;

The processor is configured to receive the electrical signal transmitted by the connecting wire, and determine the operating status of the blade under the current load by analyzing the electrical signal.

Optionally, slip rings are also included;

The slip ring is mounted on the motor shaft of the motor;

The connecting wires of the strain gauges are led out through the slip ring and connected to the processor.

Based on the blade detection platform provided by the first aspect or the second aspect above, when it is necessary to test blades with different loads, it is only necessary to install counterweights of different weights through the counterweight holes on the blades, so that the blades can be tested without replacing the blades. Different types of blades are tested, which improves the test efficiency.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 shows an overall view of a blade detection platform provided by an embodiment of the present invention;

Fig. 2 shows a blade structure diagram of a blade inspection platform provided by an embodiment of the present invention;

Fig. 3 shows a schematic structural view of an electromagnetic exciter of a blade inspection platform provided by an embodiment of the present invention;

Fig. 4 shows a schematic structural diagram of a blade detection platform provided by an embodiment of the present invention;

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

Referring to FIG. 1 , an embodiment of the present invention provides a blade detection platform, including a motor 1, a blade 2, a photoelectric converter 3, a laser transmitter 4, a processor 5, and an optical fiber sensor 6;

There is a counterweight hole on the blade 2 for installing a counterweight; the motor 1 is connected to the blade 2 to drive the blade 2 to rotate; the photoelectric converter 3 is electrically connected to the processor 5;

The laser transmitter 4 is used to emit laser light to the blade tip of the blade 2 when the blade 2 rotates;

The optical fiber sensor 6 is connected with the photoelectric converter 3, and is used to receive the light signal reflected by the blade tip, modulate the received light signal into a modulated light signal, and transmit the modulated light signal to the photoelectric converter 3;

The photoelectric converter 3 is used to receive the modulated optical signal from the optical fiber sensor 6, convert the modulated optical signal into an electrical signal, and transmit it to the processor.

The processor 5 is configured to receive the electrical signal sent by the photoelectric converter 3 and analyze the electrical signal to determine the operating status of the blade 2 under the current load. The operating conditions include the frequency at which the blades vibrate and the amplitude of the blade vibrations.

Referring to Fig. 2, in the embodiment of the present invention, in practical applications, due to the difference in shape and size of the blades, the loads of different blades during rotation may be different. The embodiment of the present invention provides a blade with a counterweight hole, by installing a counterweight 21 can artificially change the applied load and natural frequency of the blade. So as to achieve the effect of one blade simulating blades with different natural frequencies and different applied loads.

In the embodiment of the present invention, the laser transmitter 4 and the photoelectric converter 3 use a non-contact detection method to detect the vibration of the blade, and the number of receiving channels of the optical fiber sensor 6 is not less than the number of channels of the laser transmitter, so as to ensure the laser transmitter 4. The light of each working channel is received by the corresponding optical fiber sensor 6 . Since the vibration information of the blade cannot be determined by a pure optical signal, the optical signal needs to be modulated by the optical fiber sensor 6 , and the modulated optical signal can be used to interpret the vibration information of the blade 2 .

The blade 2 starts to rotate under the drive of the motor 1 . The processor 5 receives the modulated optical signal sent by the optical fiber sensor 6, and analyzes the electrical signal to determine the operating status of the blade 2 under the current applied load. When the applied load or natural frequency of the blade 2 needs to be adjusted, an appropriate counterweight is installed in the counterweight hole so that the applied load or natural frequency of the blade 2 after the counterweight is installed is consistent with that of the blade to be tested.

As an implementation, the above-mentioned blade detection platform may also include an electromagnetic exciter 7;

The electromagnetic exciter 7 is composed of a coil, placed on the periphery of the blade 2, and is used to apply an alternating load to the blade 2 when the blade 2 rotates;

Applying alternating loads can be used in the blade fracture test to detect what kind of load the blade will break under, so as to obtain the applicable working environment of the blade.

Referring to FIG. 3 , in the embodiment of the present invention, the electromagnetic exciter 7 is composed of multiple sets of coils 22 and silicon steel sheets 23 , and the coils 22 generate electromagnetic force to act on the blade 2 after electrification. Controlled by the processor 5, the processor 5 can only energize a certain number of coils 22 and control the current passing through the coils 22 according to the experimental needs.

As an embodiment, a permanent magnetic exciter 8 is also included, and the permanent magnetic exciter 8 is placed on the periphery of the blade 2 for applying a constant excitation force to the blade 2 when the blade 2 rotates.

Optionally, the counterweight 21 is a magnetic counterweight.

In this embodiment, a magnetic counterweight is used to enhance the excitation force of the electromagnetic exciter 7 or the permanent magnetic exciter 8 on the blade 2 . Different magnetic counterweights are installed on the tip of each blade, so that the excitation force of each tip is different, so as to conduct a control experiment.

As an implementation manner, it also includes a power amplifier power supply 15;

The power amplifier power supply 15 is connected with the electromagnetic exciter 7, and is used to supply power to the electromagnetic exciter 7;

The processor 5 is connected to the power amplifier power supply 15 for controlling the current output from the power amplifier power supply 15 to the electromagnetic exciter 7 .

The power amplifier power supply 15 is connected to the electromagnetic exciter 7 and is used to supply power to the electromagnetic exciter 7 . The electromagnetic exciter 7 needs to rely on an external DC power supply, and cannot directly use a general 220V AC power supply as a power supply. The magnitude of the output current of the power amplifier power supply 15 in this embodiment is controllable, it can be directly controlled by the processor 5, and the output current can also be adjusted by installing a power amplifier.

In one embodiment, a display 9 is also included, and the display 9 is electrically connected to the processor 5 for receiving and displaying the operating status information of the blade 2 determined by the processor 5 under the current load;

The operating status information is mainly the vibration of the blade 2, such as vibration frequency, vibration amplitude, etc. Through this information, the appropriate load and the most suitable speed of the blade 2 can be known, which can be used to improve the blade 2.

As an embodiment, the blade guard 10 is also included. In the experiment, the blade 2 may fall off during high-speed rotation and cause an experimental accident. The blade guard 10 is used to reduce the damage caused by the accident. Especially in the leaf fracture experiment. The blade guard can prevent the blade from flying out and causing injury.

As an embodiment, it also includes a base 11 and a motor housing 12 , and the motor housing 12 is installed on the base 11 through a fixing nut 13 .

As an implementation manner, a display 9 may also be included, and the display 9 is electrically connected to the processor 5 for receiving and displaying the operating status information of the blade 2 determined by the processor 5 under the current load.

As an embodiment, a frequency converter 14 may also be equipped to adjust the frequency of the AC power externally connected to the motor 1 .

Changing the frequency of the external alternating current can change the speed of the motor 1, thereby controlling the speed of the blade 2, so that the speed of the blade 2 is stable throughout the experiment, and the error of the experimental results is smaller.

As an embodiment, it also includes a control cabinet 16 for placing the processor 5 , the laser transmitter 4 , the frequency converter 14 , and the power amplifier power supply 15 . In addition, the display 8 and the photoelectric converter 3 can also be placed in the control cabinet 16 , and the display 9 and the photoelectric converter 3 can also be placed outside the control cabinet 16 .

Example 2

Referring to FIG. 1 and referring to FIG. 4 , an embodiment of the present invention provides a blade detection platform, including a motor 1, a blade 2, a strain gauge 19 and a processor 5;

There is a counterweight hole on the blade 2 for installing the counterweight 21; the motor 1 is connected to the blade 2 to drive the blade to rotate; the strain gauge 19 is installed on both sides of the blade tip of the blade 2; the strain gauge 19 is connected with a connecting wire 20; the connecting wire is connected to the processor 5;

The processor 5 is configured to receive the electrical signal transmitted by the connecting wire, and analyze the electrical signal to determine the operating status of the blade 2 under the current load.

In the embodiment of the present invention, the detection method of the experimental platform is a contact type, specifically, the signal is transmitted to the processor 5 through the vibration of the strain gauge.

As an embodiment, a slip ring 17 is also included;

The slip ring 17 is mounted on the shaft of the motor 1;

The connecting wires of the strain gauges are drawn out through the slip ring 17 and connected to the processor 5 .

In the embodiment of the present invention, the slip ring 17 is used to lead out the connecting wires of the strain gauges, so as to prevent the connecting wires of the strain gauges from being entangled with the wires when the blade rotates.

In the embodiment of the present invention, there may also be a bracket 18 for supporting the slip ring.

All technical solutions in the embodiments of the present invention can be combined with the technical solutions in embodiment 1, and this embodiment is only different from embodiment 1 in the detection device caused by the detection method. That is, the strain gauges in Embodiment 2 have the same functions as the laser emitter 4 , optical fiber sensor 6 , and photoelectric converter 3 in Embodiment 1, and can be replaced with each other.

Specifically, the following experimental functions can be provided in the embodiment of the present invention:

(1) The vibration test experiment of the uniform rotation of the blade, the blade is controlled by the frequency converter to run stably at the test speed, and the vibration signal during the uniform rotation of the blade is collected by using photoelectric converters, processors and other equipment, and can be fitted after analysis by the data post-processing algorithm The vibration displacement curve of each blade is obtained. The vibration displacement curve can be used to know various parameters of the blade, which is helpful to improve the shape of the blade and help in material selection.

(2) Vibration test experiment of blade speed-up and frequency-sweeping process, set the speed range and acceleration value, and measure the vibration displacement of the blade during the speed-up and speed-down process. By changing the counterweight, the situation of vibration displacement can be obtained under which circumstances, so as to design the required blades.

(3) In the blade synchronous and asynchronous vibration test experiments, the synchronous or asynchronous vibration of the blade can be aroused by controlling the rotational speed and increasing the number of excitations to change the excitation force. When the frequency of the excitation force is an integer multiple of the frequency of the rotational speed, the excitation The resulting blade vibration is synchronous vibration, and when the frequency of the exciting force is not an integer multiple of the frequency, asynchronous vibration is aroused. The vibration information of blades with different natural frequencies is obtained through testing, so as to design blades that meet actual needs.

(4) Blade fatigue fracture experiment, the blade is rotated for a long period of time by applying excitation to change the speed, etc., until cracks appear and finally breaks, record the vibration characteristic changes of the blade during the fatigue fracture process, extract the characteristic signal, and compare with the theoretical analysis results , to obtain more realistic experimental results. The blade fatigue fracture test is dangerous, and safety protection measures must be taken. In the embodiment of the present invention, a blade shield is installed on the periphery of the blade in order to prevent experimental accidents.

(5) For the strain measurement experiment of the rotating blade, the slip ring was incorporated into the experimental system during the design of this test bench, and the installation position of the slip ring was designed on the motor shaft. The ring is led out with the wire of the strain gauge and connected to the processor to realize the measurement of the blade strain. The slip ring avoids twisting and winding of the strain gauge wire during rotation.

Based on the above analysis, compared with the blade detection platform in the related art, the blade detection platform provided by the embodiment of the present invention only needs to install different weights through the counterweight hole on the blade when testing blades with different loads. The counterweight can test different types of blades without changing the blades, which improves the test efficiency.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Finally, it should be noted that: the above-described embodiments are only specific implementations of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting them, and the scope of protection of the present invention is not limited thereto, although referring to the foregoing The embodiment has described the present invention in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention Changes can be easily imagined, or equivalent replacements can be made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A blade detection platform, characterized in that, comprises a motor, a blade, an optical fiber sensor, a photoelectric converter, a laser transmitter, and a processor; There are counterweight holes on the blades for installing counterweights; the motor is connected to the blades to drive the blades to rotate; the photoelectric converter is connected to the processor; The laser emitter is used to emit laser light to the blade tip of the blade when the blade rotates; The optical fiber sensor is connected with the photoelectric converter, and is used to receive the light signal reflected by the blade tip, convert the received light signal into a modulated signal light, and then transmit the modulated light signal to the photoelectric converter ; The photoelectric converter is used to receive the modulated optical signal, convert the received modulated optical signal into an electrical signal, and transmit the electrical signal to the processor; The processor is configured to receive the electrical signal sent by the photoelectric converter, and determine the operating status of the blade under the current load by analyzing the electrical signal. 2. The blade detection platform according to claim 1, further comprising an electromagnetic exciter; the processor is used to control the current passing through the electromagnetic exciter; The electromagnetic exciter is composed of a coil and a silicon steel sheet, and is placed on the periphery of the blade to apply alternating loads to the blade when the blade rotates. 3. The blade inspection platform according to claim 1, further comprising a permanent magnetic exciter placed on the periphery of the blade for applying a constant excitation force to the blade when the blade rotates . 4. The blade inspection platform according to claim 2 or 3, wherein the counterweight is a magnetic counterweight. 5. The blade detection platform according to claim 2, further comprising a power amplifier power supply; The power amplifier power supply is connected to the electromagnetic exciter for supplying power to the electromagnetic exciter; The processor is connected with the power amplifier power supply, and is used for controlling the current output from the power amplifier power supply to the electromagnetic exciter. 6 . The blade detection platform according to claim 1 , further comprising a blade shield covering the blade. 7. The blade inspection platform according to claim 1, further comprising a frequency converter, the frequency converter is used to adjust the frequency of the current input to the motor. 8. The blade inspection platform according to claim 7, further comprising a control cabinet for placing the frequency converter, the laser transmitter, and the processor. 9. A blade detection platform, characterized in that it includes a motor, a blade, a strain gauge and a processor; There are counterweight holes on the blades for installing counterweights; the motor is connected to the blades to drive the blades to rotate; the strain gauges are installed on both sides of the tip of the blades; the A connection wire is connected to the strain gauge; the connection wire is connected to the processor through the slip ring; The processor is configured to receive the electrical signal transmitted by the connecting wire, and determine the operating status of the blade under the current load by analyzing the electrical signal. 10. The blade inspection platform according to claim 9, further comprising a slip ring; The slip ring is mounted on the motor shaft of the motor; The connecting wires of the strain gauges are led out through the slip ring and connected to the processor.