Three-way expansion monitoring device for boiler

Abstract

The utility model provides a boiler three-way expansion monitoring device, which relates to the technical field of boiler monitoring, and is characterized in that one side edge of a first reflecting plate is vertically welded with one side edge of a second reflecting plate, and any two mutually vertical side edges of a third reflecting plate are respectively and vertically welded with the bottom edges of the first reflecting plate and the second reflecting plate; the angle steel is connected with the boiler frame through the connecting support and comprises a first side face and a second side face, the first side face is parallel to the first reflecting plate, the second side face is parallel to the third reflecting plate, the end, away from the connecting support, of the first side face is perpendicularly and fixedly connected with first steel bars, and the end, away from the connecting support, of the second side face is perpendicularly and fixedly connected with second steel bars. An L-shaped connecting block is arranged on the top face of the second side face, and laser displacement sensors are arranged at the end of the L-shaped connecting block, the end of the first steel bar and the end of the second steel bar. The technical problem that the reflecting plates need to be installed at three different positions and influence measurement results mutually is solved, and the technical effects of reducing space and facilitating construction and installation of field personnel are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler monitoring technical field especially is related to a boiler three -way expansion monitoring device. BACKGROUND

[0002] In the process of thermal power generation, the boiler will produce significant three-way expansion displacement when starting and stopping the boiler and in the normal operation process due to temperature change. If the expansion displacement cannot be monitored in real time and accurately, it is easy to cause leakage at the connection of the boiler pipeline, structural deformation and even equipment damage, which directly threatens the safety and stability of the unit operation.

[0003] In the existing boiler three-way expansion monitoring device, the Chinese utility model patent with the application number CN202220264481.7 discloses a "boiler expansion displacement online monitoring system based on a laser displacement sensor", which contains a three-way displacement monitoring assembly, three fixed supports, a connecting rod and a scale monitoring device. The sensor is moved by the expansion of the boiler, and the displacement monitoring and on-site viewing are realized by combining the scale disc.

[0004] However, the three scale disc reflection plates for laser reflection in the existing monitoring system need to be installed at three different positions respectively, so that the overall structure of the monitoring system is dispersed. The pipelines around the power plant boiler are dense, and the equipment layout is compact. The limited space is difficult to accommodate the dispersed supports and reflection components, which not only increases the construction workload of on-site positioning and installation, but also may affect the accuracy of laser displacement measurement due to the space between the components. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a boiler three-way expansion monitoring device to alleviate the technical problems of the existing technology that the reflection plates need to be installed at three different positions respectively, occupy a large space and affect the measurement results.

[0006] The boiler three-way expansion monitoring device provided by the utility model comprises a first reflection plate, a second reflection plate, a third reflection plate, an angle steel, a first steel strip, a second steel strip, a laser displacement sensor and a connecting support.

[0007] One side edge of the first reflection plate is perpendicularly welded with one side edge of the second reflection plate, and two side edges of the third reflection plate perpendicular to each other are perpendicularly welded with the bottom edges of the first reflection plate and the second reflection plate respectively.

[0008] The angle steel is connected with the boiler frame through the connecting support, the angle steel comprises a first side and a second side, the first side is parallel to the first reflection plate, the second side is parallel to the third reflection plate, one end of the first side away from the connecting support is perpendicularly fixed with the first steel strip, and one end of the second side away from the connecting support is perpendicularly fixed with the second steel strip.

[0009] The second side top surface is provided with an L-shaped connecting block, and the end of the L-shaped connecting block, the first steel end and the second steel end are all provided with laser displacement sensors.

[0010] Further, the connecting support comprises a connecting steel, a reinforcing beam and a clamp;

[0011] The connecting steel is extendedly welded with the angle steel, the reinforcing beam is welded at the two ends of the connecting steel, the end of the connecting steel is bolted with the clamp, and the clamp clamps the boiler support to follow the size displacement of the boiler when the boiler expands.

[0012] Further, the laser displacement sensor is an integrated reflective sensor, and the minimum range of the laser displacement sensor is not less than 200 mm; the three laser displacement sensors are connected with the power plant control room through signal lines.

[0013] Further, the three laser displacement sensors are respectively directed to the centers of the first reflective plate, the second reflective plate and the third reflective plate, and the laser reflection routes of any two laser displacement sensors do not cross and interfere.

[0014] Further, the lengths of the angle steel, the first steel and the second steel are all 230-240 mm.

[0015] Further, the bottom of the L-shaped connecting block is provided with a first bolt hole, the top surface of the second side is provided with a second bolt hole concentric with the first bolt hole, and a bolt is inserted in the first bolt hole and the second bolt hole.

[0016] Further, the first reflective plate and the second reflective plate are hung on the steel beam through the hanging support.

[0017] Further, the side surface of the first reflective plate, the second reflective plate and the third reflective plate facing the laser displacement sensor is all provided with a reflective metal layer, and the surface flatness error is not more than 0.5 mm.

[0018] Beneficial effects:

[0019] The three-way expansion monitoring device for the boiler provided by the utility model forms an integrated structure of XYZ space coordinate system through the side vertical welding of the first reflective plate and the second reflective plate and the vertical welding of the mutually perpendicular side of the third reflective plate and the bottom edges of the first two, reduces the space occupation amount, reduces the component quantity and the assembly link, adapts to the compact environment of the dense pipeline around the power plant boiler, and reduces the difficulty of field construction arrangement; meanwhile, the first side of the angle steel is parallel to the first reflective plate, and the second side is parallel to the third reflective plate, the problem that the position of the reflective plate and the support needs to be repeatedly adjusted in the traditional dispersed structure is avoided, the installation efficiency is improved, and the alignment of the subsequent sensor and the reflective plate can be ensured.

[0020] The utility model discloses make laser displacement sensor install respectively in L type connecting block end and two strip steels end, ensure that the monitoring direction of three sensors forms three -dimensional vertical relation, and do not influence each other again, angle steel is connected with boiler frame through connecting support, drives whole support main part and sensor synchronous movement along with boiler expansion, and the relative displacement that produces can truly reflect boiler expansion, avoided the measurement deviation that caused the unstable connection of support and boiler. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will be briefly introduced the drawing needed to be used in the specific embodiment or prior art description, obviously, the drawing in the following description is some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0022] Figure 1 The structural schematic diagram of the boiler three-way expansion monitoring device provided by the embodiment of the utility model is shown in the figure.

[0023] Figure 2 The structural schematic diagram of the angle steel in the monitoring device provided by the embodiment of the utility model is shown in the figure.

[0024] Figure 3 The structural schematic diagram of the clamp in the monitoring device provided by the embodiment of the utility model is shown in the figure.

[0025] Figure 4 The reflection route map of the laser displacement sensor in the monitoring device provided by the embodiment of the utility model is shown in the figure.

[0026] Figure: 1-first reflector plate;2-second reflector plate;3-third reflector plate;4-angle steel;401-first side;402-second side;403-L type connecting block;5-first strip steel;6-second strip steel;7-laser displacement sensor;8-connecting support;801-connecting steel;802-reinforcing beam;803-clamp;9-suspension support. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantage of the embodiment of the utility model more clearly, the following will be combined with the drawing in the embodiment of the utility model, and the technical scheme in the embodiment of the utility model is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiments. The components of the embodiment of the utility model described and shown in the drawing here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are merely for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0033] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] As Figure 1 , Figure 2The utility model provides a boiler three -way expansion monitoring devices, including: first reflector plate 1, second reflector plate 2, third reflector plate 3, angle steel 4, first steel 5, second steel 6, laser displacement sensor 7 and connecting support 8,

[0035] The side of the first reflector plate 1 is perpendicular to the side of the second reflector plate 2, and the two mutually perpendicular sides of the third reflector plate 3 are respectively perpendicular to the bottom edges of the first reflector plate 1 and the second reflector plate 2.

[0036] The angle steel 4 is connected with the boiler frame through the connecting support 8, and the angle steel 4 includes a first side 401 and a second side 402, the first side 401 is parallel to the first reflector plate 1, the second side 402 is parallel to the third reflector plate 3, and the end of the first side 401 away from the connecting support 8 is vertically fixed with the first steel 5, and the end of the second side 402 away from the connecting support 8 is vertically fixed with the second steel 6.

[0037] The second side 402 is provided with an L-shaped connecting block 403, and the end of the L-shaped connecting block 403, the end of the first steel 5 and the end of the second steel 6 are provided with laser displacement sensors 7.

[0038] Specifically, the first reflector plate 1 and the second reflector plate 2 are perpendicular to the side, and the angle between the two plates is kept at 90°; the third reflector plate 3 is also made of high-reflective metal, and the two mutually perpendicular sides thereof are respectively perpendicular to the bottom edge of the first reflector plate 1 and the bottom edge of the second reflector plate 2, forming an integrated reflector device of XYZ space coordinate system. The first side 401 of the angle steel 4, i.e. the vertical flange surface, is connected perpendicularly with the second side 402, i.e. the horizontal flange surface; one end of the connecting support 8 is fixed with the boiler frame, and the other end is welded with the intersection of the first side 401 and the second side 402 of the angle steel 4, so that the angle steel 4 moves synchronously with the expansion of the boiler; the end of the first side 401 away from the connecting support 8 is vertically fixed with the first steel 5 by welding or bolt, and the end of the second side 402 away from the connecting support 8 is fixed with the second steel 6 in the same way; the L-shaped connecting block 403 is fixed on the top surface of the second side 402 by bolts, and the extension direction of the L-shaped connecting block 403 is perpendicular to the second side 402; the three laser displacement sensors 7 are respectively fixed on the end of the L-shaped connecting block 403, the end of the first steel 5 and the end of the second steel 6, and the laser emission ends of the laser displacement sensors 7 respectively face the central regions of the first reflector plate 1, the second reflector plate 2 and the third reflector plate 3.

[0039] By vertically welding and integrating the first reflector 1, the second reflector 2, and the third reflector 3, the three reflectors that originally needed to be installed independently are integrated into one unit, reducing the space occupied by the reflector device. This is suitable for the site environment of power plant boilers with dense pipes and limited space. At the same time, it avoids measurement errors caused by the positional displacement of the reflectors. The angle steel 4 is connected to the boiler frame through the connecting bracket 8, which can drive the first steel 5, the second steel 6, the L-shaped connecting block 403, and the laser displacement sensor 7 to move synchronously with the boiler expansion. The relative displacement of the laser displacement sensor 7 can accurately reflect the three-dimensional expansion of the boiler. In addition, the three laser displacement sensors 7 form a three-dimensional vertical monitoring direction, eliminating the need for repeated on-site adjustment of the sensor angle, significantly reducing the amount of construction work, and improving installation efficiency and positioning accuracy.

[0040] In embodiments of this utility model, such as Figure 3 As shown, the connecting bracket 8 includes a connecting steel 801, a reinforcing beam 802, and a clamp 803;

[0041] The connecting steel 801 is extended and welded to the angle steel 4. The two ends of the reinforcing beam 802 are welded to the connecting steel 801. The ends of the connecting steel 801 are bolted to the clamp 803, which clamps the boiler frame and is used to follow the displacement of the boiler size when the boiler expands.

[0042] The laser displacement sensor 7 is an integrated reflective sensor, and the minimum range of the laser displacement sensor 7 is not less than 200mm; the three laser displacement sensors 7 are connected to the power plant central control room through signal lines.

[0043] The three laser displacement sensors 7 are respectively oriented towards the center of the first reflector 1, the second reflector 2 and the third reflector 3, and the laser reflection paths of any two laser displacement sensors 7 do not intersect.

[0044] Specifically, the connecting steel 801 is L-shaped, with one end welded collinearly with the extension direction of the angle steel 4, forming a continuous rigid extension of the connecting steel 801 and the angle steel 4. The reinforcing beam 802 is arranged obliquely, with both ends welded to the connecting steel 801, reinforcing the connecting steel 801 and preventing it from bending under stress. The end of the connecting steel 801 away from the angle steel 4 is connected to the clamp 803 by bolts. The clamp 803 is a two-half structure, with its inner diameter matching the outer diameter of the boiler frame main pipe, ensuring that the connecting bracket 8 moves synchronously with the expansion of the boiler frame.

[0045] The laser displacement sensor 7 is an integrated reflector, combining laser emission and reception. Three laser displacement sensors 7 are fixed by bolts. The laser axis of the laser displacement sensor 7 at the end of the L-shaped connecting block 403 is perpendicular to the second reflector 2; the laser axis of the laser displacement sensor 7 at the end of the first steel bar 5 is perpendicular to the third reflector 3; and the laser axis of the laser displacement sensor 7 at the end of the second steel bar 6 is perpendicular to the first reflector 1. The laser emission directions of the three laser displacement sensors 7 extend along their respective axes, without spatial overlap to avoid signal interference. Each laser displacement sensor 7 is connected to the PLC monitoring module in the power plant's central control room via a shielded signal cable, which is secured with metal pipe clamps.

[0046] The extended welding of connecting steel 801 and angle steel 4 makes the force transmission path continuous. Together with the lateral support of reinforcing beam 802, it effectively resists the bending moment generated by boiler vibration and avoids deformation of connecting steel 801 due to cantilever stress. The clamp 803 is adapted to the circular cross section of the boiler frame to ensure that there is no relative sliding between the connecting bracket 8 and the boiler frame when the boiler expands and contracts thermally.

[0047] The laser paths of the three laser displacement sensors 7 do not intersect, avoiding false measurements caused by mutual interference of laser signals and reducing installation errors.

[0048] In the embodiments of this utility model, the lengths of angle steel 4, the first steel bar 5, and the second steel bar 6 are all 230mm to 240mm, preferably 240mm.

[0049] The bottom of the L-shaped connecting block 403 is provided with a first bolt hole, and the top surface of the second side 402 is provided with a second bolt hole that is concentric with the first bolt hole. Bolts are inserted into the first bolt hole and the second bolt hole.

[0050] The first reflector 1 and the second reflector 2 are suspended from the steel beam by the suspension bracket 9.

[0051] The surfaces of the first reflector 1, the second reflector 2, and the third reflector 3 facing the laser displacement sensor 7 are all provided with a reflective metal layer, and the surface flatness error is no greater than 0.5 mm.

[0052] Specifically, angle steel 4, the first steel bar 5, and the second steel bar 6 are all made of carbon steel. The first steel bar 5 is vertically fixed to the end of the first side 401 away from the connecting bracket 8, and the second steel bar 6 is vertically fixed to the end of the second side 402 away from the connecting bracket 8. The lengths of the three are adapted to the 200mm minimum range of the laser displacement sensor 7. The bottom of the L-shaped connecting block 403 has two pre-set first bolt holes, and the top surface of the second side 402 has two corresponding second bolt holes. Bolts pass through the two bolt holes to fasten the L-shaped connecting block 403 to the second side 402.

[0053] The first reflector 1, the second reflector 2, and the third reflector 3 are fixed by a suspension bracket 9: the suspension bracket 9 is fixed to the bottom surface of the power plant steel beam; the side of the first reflector 1, the second reflector 2, and the third reflector 3 facing the laser displacement sensor 7 is electroplated with a chromium plating layer with a reflectivity of ≥90%.

[0054] The lengths of angle steel 4, the first steel 5, and the second steel 6, while meeting the minimum range of the laser displacement sensor 7, also reserve measurement redundancy for the maximum expansion of the boiler, avoiding exceeding the range limit due to insufficient initial distance.

[0055] The way the suspension bracket 9 is attached prevents the first reflector 1, the second reflector 2, and the third reflector 3 from being displaced by boiler vibration when directly supported by the ground support, thus ensuring the stability of the measurement reference.

[0056] Based on the above embodiments, the specific working process of the boiler three-dimensional expansion monitoring device provided by this utility model is as follows:

[0057] like Figure 1 , Figure 4 As shown, the first reflector 1 and the second reflector 2 are fixed to the steel beam by the suspension bracket 9, and the third reflector 3 is welded to the first two to form an integral unit; the bracket composed of angle steel 4, the first steel bar 5, and the second steel bar 6 clamps the boiler frame by the clamp 803 connecting the bracket 8, and the laser displacement sensor 7 is directly facing the center of the reflector.

[0058] When the boiler starts up, stops, or undergoes triaxial expansion due to temperature changes during operation, the boiler frame moves the clamp 803, connecting steel 801, and angle steel 4 synchronously, which in turn moves the laser displacement sensor 7 on the first steel 5, the second steel 6, and the L-shaped connecting block 403. The laser is continuously emitted to the corresponding reflector. Due to the relative displacement between the sensor and the reflector, the reflected light signal received by the sensor changes and is converted into displacement data in real time. When the displacement value exceeds the preset safety range, the system automatically issues an alarm to remind the staff to intervene in time.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A boiler three-dimensional expansion monitoring device, characterized in that, include: First reflector (1), second reflector (2), third reflector (3), angle steel (4), first steel bar (5), second steel bar (6), laser displacement sensor (7), and connecting bracket (8); One side of the first reflector (1) is welded perpendicularly to one side of the second reflector (2), and any two mutually perpendicular sides of the third reflector (3) are welded perpendicularly to the bottom edges of the first reflector (1) and the second reflector (2), respectively. The angle steel (4) is connected to the boiler frame through the connecting bracket (8). The angle steel (4) includes a first side (401) and a second side (402). The first side (401) is parallel to the first reflector (1), and the second side (402) is parallel to the third reflector (3). A first steel bar (5) is vertically fixed to the end of the first side (401) away from the connecting bracket (8), and a second steel bar (6) is vertically fixed to the end of the second side (402) away from the connecting bracket (8). The top surface of the second side (402) is provided with an L-shaped connecting block (403), and the laser displacement sensor (7) is provided at the end of the L-shaped connecting block (403), the end of the first steel bar (5) and the end of the second steel bar (6).

2. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The connecting bracket (8) includes a connecting steel (801), a reinforcing beam (802), and a clamp (803); The connecting steel (801) is extended and welded to the angle steel (4). The two ends of the reinforcing beam (802) are welded to the connecting steel (801). The ends of the connecting steel (801) are welded to the clamp (803) by bolts. The clamp (803) clamps the boiler frame and is used to follow the displacement of the boiler size when the boiler expands.

3. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The laser displacement sensor (7) is an integrated reflective sensor, and the minimum range of the laser displacement sensor (7) is not less than 200mm; the three laser displacement sensors (7) are connected to the power plant central control room through signal lines.

4. The boiler three-dimensional expansion monitoring device according to claim 3, characterized in that, The three laser displacement sensors (7) are respectively oriented toward the center of the first reflector (1), the second reflector (2) and the third reflector (3), and the laser reflection paths of any two laser displacement sensors (7) do not intersect.

5. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The lengths of the angle steel (4), the first steel bar (5), and the second steel bar (6) are all 230mm to 240mm.

6. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The bottom of the L-shaped connecting block (403) is provided with a first bolt hole, and the top surface of the second side (402) is provided with a second bolt hole that is concentric with the first bolt hole. Bolts are inserted into the first bolt hole and the second bolt hole.

7. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The first reflector (1) and the second reflector (2) are suspended on the steel beam by a suspension bracket (9).

8. The boiler three-dimensional expansion monitoring device according to claim 1, characterized in that, The first reflector (1), the second reflector (2) and the third reflector (3) are all provided with a reflective metal layer on the side of their surfaces facing the laser displacement sensor (7), and the surface flatness error is no greater than 0.5 mm.

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