Online boiler expansion and vibration measuring instrument

Abstract

The utility model relates to the field of daily monitoring of boilers, in particular to an online boiler expansion and vibration measuring instrument which comprises a measuring device and a target assembly, the target assembly is fixedly connected to a boiler, the measuring device is arranged on a fixing frame on the periphery of the boiler, and the fixing frame is not in contact with the boiler and the target assembly; the measuring device comprises a shell, one end of the shell is connected with a camera assembly, and the camera assembly is arranged on the side close to the target; an electrical system and a gas generating device are arranged in the shell, the gas generating device is connected with a gas nozzle arranged on the shell, and generated gas can be blown to the target assembly through the gas nozzle; the target assembly comprises a support and a measuring ball arranged on the support, and the target assembly is connected to the boiler through the support.

Description

Technical Field

[0001] The utility model relates to the technical field of daily boiler monitoring, in particular to an online boiler expansion and vibration measuring instrument. Background Art

[0002] Large power station boilers generally adopt a fully suspended structure, which allows each part of the boiler body to have a relatively sufficient thermal expansion, greatly reducing the thermal effect caused by the obstruction of thermal expansion and avoiding the damage to the boiler caused by this. By setting up guiding devices such as the boiler expansion center and the boiler rigid beam, it is hoped that expansion can be achieved starting from the expansion center and in a predetermined direction. When the expansion is obstructed or the guiding device fails, the actual expansion will deviate from the design value, and the stress conditions of the relevant load-bearing components will change significantly, which can easily lead to a significant reduction in the metal life, or even short-term failure and major accidents. [1]

[0003] At the same time, when the boiler is running under load, it will vibrate due to factors such as fatigue of the boiler installation structure. The location with a large amplitude appears in the boiler side water-cooled wall outlet pipe, and the side of the pipe is the vibration direction. There are also vibrations in the boiler upper header, side cladding and side water-cooled wall. The intensity of the vibration in the side cladding is obviously greater than that in the side water-cooled wall, which is the lateral vibration direction of the boiler. The vibration direction is consistent with the side water-cooled wall outlet pipe, and the side platform (adjacent platform) also vibrates. Vibration reduces the stability of the boiler material and has the potential for major accidents. Therefore, it is also necessary to measure the vibration of the key parts of the boiler to ensure safe and economical operation.

[0004] In the prior art, there are the following detection methods: Mechanical displacement structure: A very simple mechanical displacement structure is set on the main components of the boiler. Through a metal rod on a metal scale plate, the expansion value is obtained by manually climbing to the detection position at a high altitude and reading on the spot. Disadvantages: Only three-dimensional direction can be obtained, the accuracy is only 5 mm, other data cannot be measured, and it does not have remote transmission and real-time data collection and storage functions. The operating status of the boiler cannot be monitored in real time, and the operating personnel cannot grasp its operating dynamics in time, posing a safety hazard. Most of them are currently in this way; Three-dimensional right-angle mechanical guide rail structure: There are three linear guide rails with a length of 1 meter, which are combined together in a mutually orthogonal manner. The part to be measured is specified on the slider of the guide rail. Each guide rail has a wire encoder, and the expansion value is obtained by reading the encoder value. Disadvantages: Only the three-dimensional expansion amplitude can be measured.

[0005] It cannot measure other values; it is large in size and difficult to install on the metal frame outside the boiler; the installation is complicated, dust causes the guide rail to slide and block, the wire encoder has a limited life, and it needs to be maintained by personnel at high altitudes frequently; if it is installed improperly, the boiler and the linear guide rail will get stuck, which will restrict the free expansion of the boiler and further threaten the safe operation of the boiler.

[0006] Therefore, for such an important test involving the safe operation of power plants, how to solve the problem of the huge number of tests, multi-directional amplitude, vibration detection, harsh operating environment and installation conditions poses a severe challenge and is currently a problem that power plants urgently need to solve. Utility Model Content

[0007] The utility model aims to provide an on-line boiler expansion and vibration measuring instrument to solve the problem of unstable and inaccurate boiler expansion and vibration detection under complex working conditions in the prior art.

[0008] The technical solution of the utility model is: an online boiler expansion and vibration measuring instrument, comprising a measuring device and a target assembly, wherein the target assembly is fixedly connected to the boiler, and the measuring device is arranged on a fixing frame outside the boiler, and the fixing frame is not in contact with the boiler and the target assembly;

[0009] The measuring device comprises a housing, one end of which is connected to a camera assembly, and the camera assembly is arranged on a side close to the target; an electrical system and a gas generating device are arranged inside the housing, and the gas generating device is connected to a gas nozzle arranged on the housing, and the generated gas can be blown to the target assembly through the gas nozzle;

[0010] The target assembly comprises a supporting part and a measuring part connected to the supporting part, and the target assembly is connected to the boiler through the supporting part.

[0011] Preferably, the supporting portion is a bracket, and at least one measuring ball is arranged on the bracket.

[0012] Preferably, the supporting part is a flat plate, the measuring part is a reflective sheet, and there is at least one reflective sheet.

[0013] Preferably, the target assembly further comprises a light shield, which is arranged on the outside of the support portion and connected to the boiler.

[0014] Preferably, the housing comprises a front plate and a rear plate, the front plate is arranged at one end close to the target assembly and is provided with a laser emission window and a camera acquisition window.

[0015] Preferably, the laser emission windows are provided in plurality and arranged on the periphery of the camera acquisition window.

[0016] Preferably, the camera assembly includes a laser emitting device and a high-speed camera, the high-speed camera is connected to the camera acquisition window, and can collect graphic information through the camera acquisition window; the laser emitting device is connected to the laser emitting window, and can emit laser through the laser emitting window to illuminate the measuring ball to provide a target signal for the high-speed camera.

[0017] Preferably, the electrical system includes a measurement control board, and the measurement control board is electrically connected to the camera assembly and the gas generating device.

[0018] Preferably, the measuring device further comprises a power module, a wireless transmitting antenna and a display screen, and the power module, the wireless transmitting antenna and the display screen are all connected to the measuring control board.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] (1) The laser emitting device illuminates the measuring ball through multiple laser emitting windows, so that the measuring ball reflects light at different angles. The high-speed camera collects the reflected light information. Through image collection and filtering, the position of the measuring ball can be accurately calculated, and the expansion amplitude and vibration frequency can be further calculated;

[0021] (2) Compared with traditional measurement methods, optical non-contact measurement is wear-free, maintenance-free, and has high-precision and high-speed measurement. It has small dimensions and light weight, and has low load-bearing requirements for the boiler installation platform. It can be installed quickly without complex debugging, reducing the difficulty of high-altitude operations. The measurement results can be transmitted wirelessly over long distances and can be monitored in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 This is a structural schematic diagram of the online boiler expansion and vibration measuring instrument of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the measuring device of the utility model;

[0025] Figure 3 It is a schematic diagram of the internal structure of the measuring device of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of a target assembly of other structures described in the utility model.

[0027] Wherein: measuring device 1, housing 11, body 111, front plate 112, rear plate 113, power socket 114, laser emission window 115, camera acquisition window 116, camera assembly 12, laser emission device 121, high-speed camera 122, electrical system 13, measurement control board 131, gas generating device 14, gas nozzle 141;

[0028] Target assembly 2, bracket 21, measuring ball 22, light shield 23, plate 24, reflecting part 241;

[0029] Boiler 3;

[0030] Fixed frame 4. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0032] like Figure 1-3 As shown, an online boiler expansion and vibration measuring instrument includes a measuring device 1 and a target assembly 2. The target assembly 2 is fixedly connected to a boiler 3. The measuring device 1 is arranged on a fixing frame 4 outside the boiler, and the fixing frame is not in contact with the boiler and the target assembly 2. In this embodiment, the distance between the measuring device 1 and the target assembly 2 is about 1m, and the measuring device 1 and the target assembly 2 are self-checked without any obstruction; the fixing frame is always fixed and is not deformed or offset by the external environment, or the amount of deformation or offset can be ignored and does not affect the measurement result.

[0033] The measuring device 1 includes a housing 11, one end of which is connected to a camera assembly 12, which is arranged on a side close to the target assembly 2; an electrical system 13 and a gas generating device 14 are arranged inside the housing 11, and the gas generating device 14 is connected to a gas nozzle 141 arranged on the housing 11, and the generated gas can be blown to the target assembly 2 through the gas nozzle 141. In this embodiment, according to actual usage conditions, the use environment of the power plant boiler is generally serious dust, which is easy to accumulate on the optical target, resulting in weak target signal acquisition. If manual maintenance requires frequent high-altitude operations, the setting of the gas generating device 14 can regularly blow high-pressure gas to the target assembly 2 through the gas nozzle 141 to clean the target assembly 2. That is, the measurement accuracy is guaranteed and the maintenance workload is reduced.

[0034] The housing 11 is made of an aluminum alloy body, including a body 111, a front plate 112 and a rear plate 113. The housing 11 is a sealed structure as a whole and has a certain waterproof performance. An optical glass window is connected to the front end of the front plate 112 and is arranged at one end close to the target assembly 2; a laser emission window 115 and a camera acquisition window 116 are also arranged on the front plate 112, and a plurality of laser emission windows 115 are arranged and arranged on the periphery of the camera acquisition window 116. A liquid crystal display is arranged on the body 111. A power socket 114 is connected to the rear plate 113.

[0035] The camera assembly 12 includes a laser emitting device 121 and a high-speed camera 122. The high-speed camera 122 is connected to the camera acquisition window 116 and can acquire graphic information through the camera acquisition window 116. The laser emitting device 121 is connected to the laser emitting window 115 and can emit laser light through the laser emitting window 115 to illuminate the measuring ball 22 to provide a target signal for the high-speed camera 122. In this embodiment, six laser emitting windows 115 are provided and are evenly arranged at the outer circumference of the camera acquisition window 116. The laser emitted by the laser emitting device 121 is simultaneously transmitted from the six laser emitting windows 115 and illuminated on the target assembly 2.

[0036] The electrical system 13 includes a measurement control board 131, which is electrically connected to the camera assembly 12 and the gas generating device 14. The measuring device 1 also includes a power module, a wireless transmitting antenna and a display screen, which are all connected to the measurement control board 131.

[0037] The target assembly 2 includes a support portion and a measuring portion. Figure 1 As shown, the support part is a cross-shaped bracket 21, the measuring part is a measuring ball 22 arranged on the bracket 21, and the target assembly 2 is connected to the boiler through the bracket 21. The bracket 21 is cross-shaped, and the measuring ball 22 is connected to the four ends of the bracket 21. The target assembly 2 also includes a light shield 23, which is arranged on the outside of the bracket 21 and connected to the boiler. In this embodiment, the target assembly 2 can be made of aluminum alloy or other high-temperature resistant materials to reduce the impact of the heat of the boiler on it; the surface of the measuring ball 22 is coated with a coating that can enhance the reflection of infrared light to increase the signal of the measuring device 1, so that the measurement is more accurate. The setting of the light shield 23 can reduce the optical interference of external light sources on the measuring ball 22, and further increase the reliability of the measurement.

[0038] It should be noted that the target assembly 2 is not limited to the cross-shaped bracket 21 and the spherical measuring ball 22 in this embodiment, and can also be set to other structures according to actual needs, such as the attached Figure 4 The flat plate 24 and the reflector 241 disposed on the flat plate 24 are shown; in addition, one or more measuring parts such as measuring balls and reflectors can be disposed, and are not limited to symmetrical or asymmetrical arrangements.

[0039] In this embodiment, the target assembly 2 is fixedly mounted on the boiler body, and can move synchronously with the expansion of the boiler. Therefore, the movement of the target assembly 2 can be equivalent to the expansion of the components on the boiler. The measuring device 1 can collect the offset and vibration of the measuring ball 22 in multiple directions hundreds of times per second, and transmit the data to the control room or related systems in real time, monitor the boiler in real time, obtain operating indicators, and comprehensively monitor the operation of the boiler.

[0040] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

Claims

1. An online boiler expansion and vibration measuring instrument, characterized in that: It includes a measuring device and a target assembly, wherein the target assembly is fixedly connected to the boiler, and the measuring device is arranged on a fixing frame outside the boiler, and the fixing frame is not in contact with the boiler and the target assembly; The measuring device comprises a housing, one end of which is connected to a camera assembly, and the camera assembly is arranged on a side close to the target; an electrical system and a gas generating device are arranged inside the housing, and the gas generating device is connected to a gas nozzle arranged on the housing, and the generated gas can be blown to the target assembly through the gas nozzle; The target assembly comprises a supporting part and a measuring part connected to the supporting part, and the target assembly is connected to the boiler through the supporting part.

2. The on-line boiler expansion and vibration measuring instrument according to claim 1, characterized in that: The supporting part is a bracket, and at least one measuring ball is arranged on the bracket.

3. The on-line boiler expansion and vibration measuring instrument according to claim 1, characterized in that: The supporting part is a flat plate, the measuring part is a reflective sheet, and there is at least one reflective sheet.

4. The on-line boiler expansion and vibration measuring instrument according to claim 1 is characterized in that: The target assembly further comprises a light shield, which is arranged on the outside of the supporting part and connected to the boiler.

5. The on-line boiler expansion and vibration measuring instrument according to claim 1 is characterized in that: The housing comprises a front plate and a rear plate. The front plate is arranged at one end close to the target assembly and is provided with a laser emission window and a camera collection window.

6. The on-line boiler expansion and vibration measuring instrument according to claim 5 is characterized in that: The laser emission windows are provided in plurality and arranged on the periphery of the camera collection window.

7. The on-line boiler expansion and vibration measuring instrument according to claim 5 is characterized in that: The camera assembly includes a laser emitting device and a high-speed camera. The high-speed camera is connected to a camera acquisition window and can collect graphic information through the camera acquisition window. The laser emitting device is connected to a laser emitting window and can emit a laser through the laser emitting window to illuminate a measuring ball to provide a target signal for the high-speed camera.

8. The on-line boiler expansion and vibration measuring instrument according to claim 1 is characterized in that: The electrical system includes a measurement control board, which is electrically connected to the camera assembly and the gas generating device.

9. The on-line boiler expansion and vibration measuring instrument according to claim 8, characterized in that: The measuring device also includes a power module, a wireless transmitting antenna and a display screen, and the power module, the wireless transmitting antenna and the display screen are all connected to the measuring control board.

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