CN207366187U - A kind of wireless frequency measurement special fixture of steam turbine blade - Google Patents

A kind of wireless frequency measurement special fixture of steam turbine blade Download PDF

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Publication number
CN207366187U
CN207366187U CN201721237631.0U CN201721237631U CN207366187U CN 207366187 U CN207366187 U CN 207366187U CN 201721237631 U CN201721237631 U CN 201721237631U CN 207366187 U CN207366187 U CN 207366187U
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CN
China
Prior art keywords
folder
vibration pickup
vibration
steam turbine
turbine blade
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Active
Application number
CN201721237631.0U
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Chinese (zh)
Inventor
晏涛
万忠海
鲁锦
陈文�
蔡文
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Priority to CN201721237631.0U priority Critical patent/CN207366187U/en
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Abstract

The utility model discloses a kind of wireless frequency measurement special fixture of steam turbine blade, including the first folder and the second folder, the middle part of first folder carries out hinge-connection with the middle part of the second folder, the upper inner of first folder and the second folder is provided with connecting spring, latex chuck is both provided with the collet of first folder and the second folder, vibration pickup box is provided with the outside of first folder, mounting hole is provided with the vibration pickup box edge, the vibration pickup is fixed on vibration pickup box by velcro.The utility model is simple in structure, easy to use, does not influence the accuracy of test vibration in the course of work, and substantially increases the speed of measurement, improves work efficiency, substantially reduces time of measuring.

Description

A kind of wireless frequency measurement special fixture of steam turbine blade
Technical field
The utility model category steam turbine experimental technique apparatus field, and in particular to one kind is consolidated for testing steam turbine blade There is the special fixture in frequency.
Background technology
The intrinsic frequency of blade is to reflect the important parameter of vibration characteristic of turbine moving blade.Measure the static frequency of blade Rate, is the installation quality for checking steam turbine blade, finds hidden danger present in blade, and carry out safety evaluatio to blade Important means.Traditional automobile movable blade static frequency test method is by the output power of Regulate signal generator, is made The Lissajou's figure of oscillograph(Be by two frequencies in mutually perpendicular direction into simple integer than simple harmonic oscillation closed Into it is regular, stablize closed curve)For steady and audible circle or ellipse, at this time, the output frequency value of signal generator is To be tested the intrinsic frequency of blade.The method of the measurement Natural Frequency of Blade is widely used, but in measurement process In there are the shortcomings of measurement accuracy is low, human error is big, time of measuring is long and measurement result can not be stored and printed.It is another Aspect, uses wired connection between vibration pickup and frequency measuring device, at Steam Turbine overhaul scene, progress test job is extremely inconvenient, And connecting line easily snaps off.
2016, we researched and developed and have applied for a kind of portable mobile wireless vibration pickup device of utility model patent, Patent No. 201620815071.11 a kind of portable mobile wireless vibration pickup device, including encapsulation vibration frequency measuring cell inside the shell, Vibration frequency measuring circuit, microcontroller, wireless transport module and power supply, it is characterised in that the vibration frequency measuring cell Signal end connects vibration frequency measuring circuit, and the sound end of the vibration frequency measuring cell is placed in outside shell;The microcontroller It is connected between wireless transport module and vibration frequency measuring circuit, vibration frequency is measured member by the vibration frequency measuring circuit The analog signal of part is converted to digital signal and exports to microcontroller, and the microcontroller is responsible for handling and stores vibration frequency measurement electricity The number of road output
Word signal;The wireless transport module is responsible for the data transfer by microcontroller storage into computer;The power supply Vibration frequency measuring circuit, microcontroller, wireless transport module are connected respectively and are powered.During traditional measurement, often Vibration pickup is fixed using hand-held, and such a fixed form is once only capable of one group of blade of measurement, measures multigroup blade at the same time, needs A kind of special fixture is wanted to carry out steam turbine blade natural frequency measurement,.
Utility model content
The utility model aims to solve the problem that the intrinsic frequency of steam turbine blade in the prior art is traditional in measurement process Fixed form can not measure the problem of multigroup blade at the same time, there is provided a kind of wireless frequency measurement special fixture of steam turbine blade.
In order to solve the above technical problems, the utility model adopts the following technical solution:
Design a kind of wireless frequency measurement special fixture of steam turbine blade, including the first folder and the second folder, described first The middle part of folder and the middle part of the second folder carry out hinge-connection, are provided with and are connected with the upper inner of the second folder in the first folder Spring, is both provided with latex chuck at the collet of first folder and the second folder, is provided with the outside of first folder Vibration pickup box, is provided with mounting hole on the vibration pickup box edge, the vibration pickup is fixed on vibration pickup box by velcro.
Further, first folder and the second folder are right angle ladder body structure.
Further, first folder is made with the second folder of light plastic, the side height of the vibration pickup box Less than the height of vibration pickup, vibration pickup is anchored on fixture by velcro.
Further, for the coefficient of elasticity of the connecting spring in 0.6-1.5 N/mm, coefficient of elasticity is too big, causes fixture grip force It is excessive, blade is easily damaged, coefficient of elasticity is too small, and easily the vibration damping in blade vibration, influences accuracy of measurement.
The beneficial effects of the utility model are:The utility model is simple in structure, easy to use, does not influence to survey in the course of work The accuracy of vibration is tried, and substantially increases the speed of measurement, improves work efficiency, substantially reduces time of measuring.
Brief description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality New embodiment is used to explain the utility model together, does not form the limitation to the utility model.In the accompanying drawings:
Fig. 1 the utility model clamp structure schematic diagrames;
Wherein, 1 is the first folder;2 be the second folder;3 be hinged component;4 be connecting spring, and 5 be latex chuck, and 6 be to pick up Shake device box, and 7 be mounting hole, and 8 be velcro.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment, based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the utility model discloses a kind of technical solution:A kind of wireless frequency measurement exclusive clamps of steam turbine blade The middle part of tool, including the first folder 1 and the second folder 2, the middle part of first folder 1 and the second folder 2 by hinged component 3 into Row hinge-connection, 1 and second folder 2 of the first folder are right angle ladder body structure, wherein, the water of the first folder 1 and the second folder 2 Plane side is located at outside, and the upper inner of the first folder 1 and the second folder 2 is provided with connecting spring 4, first folder 1 With being both provided with latex chuck 5 at the collet of the second folder 2, the outside of first folder 1 is provided with vibration pickup box 6, described Vibration pickup box 6 is fit for square, and size is slightly larger than the volume of vibration pickup, and mounting hole 7 is provided with 6 edge of vibration pickup box, The vibration pickup is fixed on vibration pickup box 6 by velcro 8.
More specifically, first folder 1 is made with the second folder 2 of light plastic, the side of the vibration pickup box 6 Highly it is less than the height of vibration pickup, vibration pickup is anchored on fixture by velcro 8, and do not stay seam among fixture and vibration pickup Gap.
More specifically, the coefficient of elasticity of the connecting spring is in 0.6-1.5 N/mm, it is preferred that the elasticity system of connecting spring Number is 1.2 N/mm, and coefficient of elasticity is too big, causes fixture grip force excessive, is easily damaged blade, coefficient of elasticity is too small, easily in leaf Vibration damping in piece vibration, influences accuracy of measurement.
Finally it should be noted that:It these are only the preferred embodiment of the utility model, be not limited to this practicality It is new, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, It can still modify the technical solution described in foregoing embodiments, or which part technical characteristic is carried out etc. With replacing, where within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on, should all include Within the scope of protection of the utility model.

Claims (3)

1. a kind of wireless frequency measurement special fixture of steam turbine blade, it is characterised in that described including the first folder and the second folder The middle part of first folder and the middle part of the second folder carry out hinge-connection, are provided with the upper inner of the first folder and the second folder Connecting spring, is both provided with latex chuck at the collet of first folder and the second folder, is set on the outside of first folder Vibration pickup box is equipped with, mounting hole is provided with the vibration pickup box edge, vibration pickup is fixed on vibration pickup box by velcro.
A kind of 2. wireless frequency measurement special fixture of steam turbine blade according to claim 1, it is characterised in that the pick-up Device box is square box body structure, its side is highly less than the height of vibration pickup, vibration pickup is anchored on fixture by velcro.
A kind of 3. wireless frequency measurement special fixture of steam turbine blade according to claim 2, it is characterised in that the connection The coefficient of elasticity of spring is in 0.6-1.5 N/mm.
CN201721237631.0U 2017-09-26 2017-09-26 A kind of wireless frequency measurement special fixture of steam turbine blade Active CN207366187U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721237631.0U CN207366187U (en) 2017-09-26 2017-09-26 A kind of wireless frequency measurement special fixture of steam turbine blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721237631.0U CN207366187U (en) 2017-09-26 2017-09-26 A kind of wireless frequency measurement special fixture of steam turbine blade

Publications (1)

Publication Number Publication Date
CN207366187U true CN207366187U (en) 2018-05-15

Family

ID=62350020

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721237631.0U Active CN207366187U (en) 2017-09-26 2017-09-26 A kind of wireless frequency measurement special fixture of steam turbine blade

Country Status (1)

Country Link
CN (1) CN207366187U (en)

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