A boiler superheater stress detector

Abstract

The application discloses a boiler superheater stress detector and relates to the technical field of stress detection, which comprises a superheater pipeline and a side plate, the side plate is arranged on the side of the superheater pipeline, a connecting shaft is rotatably connected to the side plate, a connecting plate is fixedly connected to the side of the connecting shaft, a fixing block is installed on the connecting plate, a screw rod is installed around the fixing block, a closing assembly is arranged on the screw rod, a first connecting plate is fixedly arranged on the closing assembly, a first outer sleeve is fixedly connected to the first connecting plate, a second outer sleeve is arranged on the outer side of the first outer sleeve, a second connecting plate is fixedly connected to the second outer sleeve, a strain gauge is arranged on the inner sides of the second connecting plate and the first connecting plate, and a connecting block is fixedly arranged on the strain gauge. The application solves the problem that the existing stress detector cannot provide heat insulation effect while ensuring normal work of the strain gauge, and cannot simultaneously adapt to stress detection and calibration of multiple groups of superheater pipelines.

Description

Technical Field

[0001] This invention relates to the field of stress detection technology, specifically a stress detector for boiler superheaters. Background Technology

[0002] High-efficiency and energy-saving boilers are an important direction for industrial development. Boiler energy saving and consumption reduction not only depend on improvements in combustion efficiency and heat exchange technology, but are also closely related to the long-term safe and stable operation of the equipment. As the component in an energy-saving boiler operating under the most severe conditions, the superheater's deformation and fatigue cracking caused by stress are the main reasons for the decline in boiler thermal efficiency. Therefore, it is necessary to detect superheater stress; however, existing stress detection equipment still has some shortcomings.

[0003] Patent CN116481679B discloses a stress monitoring device and method for the fire-facing side of a power plant boiler water-cooled wall. The device includes: a distance-measuring heat collector and a temperature-measuring heat collector; a distance-measuring blind hole on the distance-measuring heat collector and a temperature-measuring blind hole on the temperature-measuring heat collector; a distance measuring instrument for detecting the depth of the distance-measuring blind hole and obtaining its depth value; a distance-measuring optical fiber for transmitting the depth value of the distance-measuring blind hole via a depth light signal; a temperature-sensing probe at the temperature-measuring end of the temperature-measuring optical fiber for detecting the temperature inside the temperature-measuring blind hole and obtaining its temperature value; the temperature-measuring optical fiber for transmitting the temperature value of the temperature-measuring blind hole via a temperature light signal; and a monitoring processor for processing the depth and temperature light signals to obtain the corresponding depth value L1 and temperature value T1. This invention solves the problem that existing detection instruments cannot operate in harsh environments to detect stress in water-cooled walls. Although the above-mentioned device can be used in harsh environments, the thermal insulation performance of the existing stress detection structure is insufficient during use, which affects the detection accuracy and cannot provide thermal insulation while ensuring the normal operation of the strain gauge.

[0004] Patent CN118129956B discloses a method and device for stress testing of high-temperature components in power plant boilers. The method includes an adjustment component and a testing component. The adjustment component comprises multiple support blocks, each with a vertically formed receiving groove. Limiting blocks are symmetrically arranged at both ends of the receiving groove. An elastic element, a first connecting rod, and a second connecting rod are disposed within the receiving groove. One end of each connecting rod is fixedly connected to a limiting plate. By adjusting the length of the first and second connecting rods extending beyond the receiving groove, the device can be adjusted according to the diameter of the power plant boiler pipes, thereby expanding its applicability. The elastic element applies tension to the first and second connecting rods according to the diameter of the power plant boiler pipes, ensuring the substrate adheres to the surface of the power plant boiler pipes. This allows the device to test the power plant boiler pipes without welding the substrate to the pipe surface. While the device can adapt to different pipe diameters, it lacks heat insulation functionality and cannot simultaneously perform stress detection and calibration on multiple sets of pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a boiler superheater stress detector to address the problems that existing stress detectors cannot provide heat insulation while ensuring the normal operation of strain gauges, and cannot simultaneously adapt to stress detection and calibration of multiple superheater pipes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a boiler superheater stress detector, comprising a superheater pipe and a side plate, wherein the side plate is disposed on the side of the superheater pipe, a connecting shaft is rotatably connected to the side plate, a connecting plate is fixedly connected to the side of the connecting shaft, a fixing block is mounted on the connecting plate, screws are mounted around the fixing block, a closing assembly is disposed on the screws, a first connecting plate is fixedly disposed on the closing assembly, a first outer bushing is fixedly connected to the first connecting plate, a second outer bushing is disposed on the outside of the first outer bushing, a second connecting plate is fixedly connected to the second outer bushing, strain gauges are disposed on the inner sides of the second connecting plate and the first connecting plate, a connecting block is fixedly disposed on the strain gauge, a base is disposed on the connecting block, the base is fixedly connected to the superheater pipe, an opening is disposed on the side of the second outer bushing, a mounting plate is disposed in the opening, and a movable plate is disposed on the side of the mounting plate.

[0007] As a further embodiment of the present invention: the connecting shaft, the connecting plate and the fixing block are fixedly connected as an integral structure, and the side plate, the connecting shaft and the connecting plate are symmetrically distributed on both sides of the fixing block.

[0008] As a further aspect of the present invention: the screw and the fixing block are connected by a thread, and the position and number of the screws correspond one-to-one with the position and number of the strain gauges.

[0009] As a further embodiment of the present invention: the screw passes through the movable plate and is rotatably connected to the strain gauge; the movable plate and the mounting plate are slidably connected; and the mounting plate and the second outer bushing are slidably connected.

[0010] As a further embodiment of the present invention: a first traction steel rope and a second traction steel rope are fixedly connected to the screw, and the first traction steel rope and the second traction steel rope are wound in opposite directions on the screw.

[0011] As a further embodiment of the present invention: the substrate and the connecting block are symmetrically distributed on both sides of the strain gauge, and the connection between the substrate and the superheater pipe is welding.

[0012] As a further embodiment of the present invention: the substrate, the connecting block and the strain gauge are fixedly connected as an integral structure, and there are gaps between the outer wall of the strain gauge and the inner wall of the first connecting plate and the first outer bushing.

[0013] As a further embodiment of the present invention: the first connecting plate, the first outer bushing, the second connecting plate and the second outer bushing are all made of ceramic material, the first outer bushing and the second outer bushing are both arc-shaped, and there is a gap between the outer wall of the first outer bushing and the inner wall of the second outer bushing.

[0014] As a further embodiment of the present invention: the closing component includes a first connecting pipe fixedly connected to the upper and lower sides of the first connecting plate, a first connecting cover fixedly connected to the first connecting pipe, and a second connecting pipe fixedly connected to both the upper and lower sides of the second connecting plate, a second connecting cover fixedly connected to the second connecting pipe.

[0015] As a further embodiment of the present invention: the first connecting tube, the first connecting cover, the second connecting tube and the second connecting cover are all made of ceramic material, the first connecting cover and the second connecting cover are both hemispherical structures with a cross-section on the side, and wire holes are opened on the first connecting cover and the second connecting cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a base, a first connecting plate, a second connecting plate, and a closing assembly, the influence of the superheater's high temperature on the strain gauge is reduced. When the superheater pipe is working, the base and the first and second connecting plates on the outside of the strain gauge can reduce heat transfer, ensuring that the strain gauge can accurately detect the stress changes in the superheater pipe and enhancing the accuracy of the device's strain detection. 2. The device is equipped with a first outer bushing and a second outer bushing. When the superheater pipe deforms due to heat load, the material of the superheater pipe resists the deformation, thereby generating stress. This causes the strain gauge to deform in tandem with the pipe, and the strain gauge will be stretched or compressed slightly. In order to avoid the compression affecting the heat insulation structure on the outside of the strain gauge, the gap between the first outer bushing and the second outer bushing ensures that the strain gauge will not be blocked when stretched or compressed. At the same time, the first connecting cover and the second connecting cover can ensure the overall heat insulation effect of the device, which solves the problem that existing stress detectors cannot provide heat insulation while ensuring the normal operation of the strain gauge. This device can improve the detection accuracy without affecting the stress detection.

[0017] 3. The device is equipped with a fixed block, screws, and a movable plate. Since the screws are connected to the strain gauges, when assembling the device with the superheater pipes, the strain gauges are first connected to an external detector. By screwing in or out the screws, the stress detection of each strain gauge is calibrated. Then, the fixed screws and fixed blocks are welded on, allowing the device to be calibrated before detecting stress changes. This enhances the adaptability of the device. Furthermore, by using multiple screws in conjunction with multiple sets of closed components and strain gauges, the stress changes of four pipes can be detected simultaneously, solving the problem that existing strain detectors cannot simultaneously adapt to stress detection and calibration of multiple sets of superheater pipes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the bottom structure of the side plate of the present invention; Figure 4 This is a schematic diagram of the connection structure between the superheater pipes and the base of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the connection structure between the second outer bushing and the second connecting cover of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the closed component of the present invention; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C; Figure 9 This is a schematic diagram of the connection structure between the base and the connecting block of the present invention; Figure 10 This is a schematic diagram of the disassembled structure of the first connecting plate and the first connecting pipe of the present invention; Figure 11 for Figure 10 An enlarged schematic diagram of the structure at point D.

[0019] Reference numerals: 1. Superheater pipe; 2. Side plate; 3. Connecting shaft; 4. Connecting plate; 5. Fixing block; 6. Screw; 7. Base; 8. Connecting block; 9. Strain gauge; 10. First connecting plate; 11. First outer bushing; 12. Second connecting plate; 13. Second outer bushing; 14. Closure assembly; 1401. First connecting pipe; 1402. First connecting cover; 1403. Second connecting pipe; 1404. Second connecting cover; 1405. Wire hole; 15. Opening; 16. Mounting plate; 17. Movable plate; 18. First traction steel rope; 19. Second traction steel rope. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0022] Example 1: like Figures 1-11As shown, this embodiment proposes a boiler superheater stress detector, including a superheater pipe 1 and a side plate 2. The side plate 2 is disposed on the side of the superheater pipe 1. A connecting shaft 3 is rotatably connected to the side plate 2. A connecting plate 4 is fixedly connected to the side of the connecting shaft 3. A fixing block 5 is installed on the connecting plate 4. Screws 6 are installed around the fixing block 5. A closing assembly 14 is disposed on the screws 6. A first connecting plate 10 is fixedly disposed on the closing assembly 14. A first outer bushing 11 is fixedly connected to the first connecting plate 10. A second outer bushing 13 is disposed outside the first outer bushing 11. A second connecting plate 12 is fixedly connected to the second outer bushing 13. Strain gauges 9 are installed on the inner sides of the second connecting plate 12 and the first connecting plate 10. A connecting block 8 is fixedly installed on the strain gauge 9, and a base 7 is installed on the connecting block 8. The base 7 is fixedly connected to the superheater pipe 1. An opening 15 is provided on the side of the second outer bushing 13, and a mounting plate 16 is installed inside the opening 15. A movable plate 17 is provided on the side of the mounting plate 16. When the strain gauge 9 detects stress, the first connecting plate 10 and the second connecting plate 12 will shift, and the first outer bushing 11 will move within the second outer bushing 13. This ensures that the strain gauge 9 can work normally while insulating it from the heat, and reduces the impact of high temperature on the strain gauge 9. Four screws 6 correspond to four sets of closed components 14 and strain gauges 9, enabling the device to detect the strain of four superheater pipes 1 simultaneously, improving the working efficiency of the device. The screws 6 can calibrate the stress of the strain gauge 9 before stress detection, enhancing the stress detection accuracy of the device.

[0023] Example 2: The solution in Example 1 will be further described below with reference to its specific working method. like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the connecting shaft 3, the connecting plate 4, and the fixing block 5 are further fixedly connected as an integral structure. The side plate 2, the connecting shaft 3, and the connecting plate 4 are symmetrically distributed on both sides of the fixing block 5. The side plate 2 forms a rotating structure with the connecting shaft 3 and the connecting plate 4, so that the side plate 2 can be rotated in the future to insert the fixing block 5 into the center position of the four superheater pipes 1, which facilitates the subsequent calibration of the strain gauges 9 at the four positions.

[0024] like Figure 2 , Figure 4 , Figure 5 , Figure 10 and Figure 11 As shown, in a preferred embodiment, based on the above method, the screw 6 and the fixing block 5 are further connected by a thread. The position and number of screws 6 correspond one-to-one with the position and number of strain gauges 9, ensuring that each screw 6 corresponds to one strain gauge 9, so that the device can accurately calibrate the strain gauges 9 before stress detection.

[0025] like Figure 4 and Figure 5 As shown, in a preferred embodiment, based on the above method, the screw 6 passes through the movable plate 17 and is rotatably connected to the strain gauge 9. The movable plate 17 and the mounting plate 16 are slidably connected, and the mounting plate 16 and the second outer bushing 13 are slidably connected. The slidably installed movable plate 17 and mounting plate 16 avoid stress from affecting the heat insulation effect of the device and enhance the overall stability of the device.

[0026] like Figure 10 and Figure 11 As shown, in a preferred embodiment, based on the above method, a first traction steel rope 18 and a second traction steel rope 19 are fixedly connected to the screw 6. The first traction steel rope 18 and the second traction steel rope 19 are wound in opposite directions on the screw 6. By pulling the first traction steel rope 18 or the second traction steel rope 19, the rotation direction of the screw 6 is changed. By screwing the screw 6 in or out, the stress detection value around the device is calibrated.

[0027] like Figures 6-9 As shown, in a preferred embodiment, based on the above method, the base 7 and the connecting block 8 are symmetrically distributed on both sides of the strain gauge 9. The base 7 is connected to the superheater pipe 1 by welding, which ensures that the stress of the superheater pipe 1 can be stably transmitted to both sides of the strain gauge 9 when it is working, thereby performing stress detection.

[0028] like Figure 6 , Figure 7 and Figure 9 As shown, in a preferred embodiment, based on the above method, the base 7, the connecting block 8 and the strain gauge 9 are further fixedly connected as an integral structure. There are gaps between the outer wall of the strain gauge 9 and the inner wall of the first connecting plate 10 and the first outer bushing 11. The first connecting plate 10 and the first outer bushing 11 can play a heat insulation function and do not affect the normal operation of the strain gauge 9.

[0029] like Figures 6-8 As shown, in a preferred embodiment, based on the above method, the first connecting plate 10, the first outer bushing 11, the second connecting plate 12 and the second outer bushing 13 are all made of ceramic material. The first outer bushing 11 and the second outer bushing 13 are both arc-shaped. There is a gap between the outer wall of the first outer bushing 11 and the inner wall of the second outer bushing 13. The arc-shaped first outer bushing 11 and the second outer bushing 13 can play the role of hinge in a loose state, which can not only improve the heat insulation effect, but also adapt to stress changes.

[0030] like Figure 2 and Figures 6-10As shown, in a preferred embodiment, based on the above method, the closing component 14 further includes a first connecting pipe 1401 fixedly connected to the upper and lower sides of the first connecting plate 10, a first connecting cover 1402 fixedly connected to the first connecting pipe 1401, a second connecting pipe 1403 fixedly connected to both the upper and lower sides of the second connecting plate 12, and a second connecting cover 1404 fixedly connected to the second connecting pipe 1403. The first connecting pipe 1401 and the first connecting cover 1402 are used to close the two sides of the first connecting plate 10, and the second connecting pipe 1403 and the second connecting cover 1404 are used to close the two sides of the second connecting plate 12.

[0031] like Figures 6-10 As shown, in a preferred embodiment, based on the above method, the first connecting pipe 1401, the first connecting cover 1402, the second connecting pipe 1403, and the second connecting cover 1404 are all made of ceramic material. The first connecting cover 1402 and the second connecting cover 1404 are both hemispherical structures with facets on their sides. The first connecting cover 1402 and the second connecting cover 1404 are each provided with wire holes 1405 to ensure that the first connecting pipe 1401 and the first connecting cover 1402 are loosely hinged with the second connecting pipe 1403 and the second connecting cover 1404, thus ensuring heat insulation performance while enabling the device to adapt to stress changes.

[0032] Example 3: The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods. Specifically, when using the superheater stress detector of this boiler: (e.g.) Figures 1-5 and Figure 11 As shown, the device can rotate the side plate 2 via the connecting shaft 3, bringing the side plate 2 into contact with the sides of the two superheater pipes 1. The connecting plate 4 supports the side plate 2. The entire device is then adjusted to... Figure 2 After reaching the specified state, the screws 6 around the fixed block 5 correspond to four sets of strain gauges 9, the first connecting plate 10, the first outer bushing 11, the second connecting plate 12, the second outer bushing 13, and the closing assembly 14. This allows the device to simultaneously detect the strain of the superheater pipe 1 in four areas. The screws 6 can calibrate the stress of the strain gauges 9 before stress detection, such as... Figure 4 , Figure 5 , Figure 10 and Figure 11As shown, since the screw 6 passes through the movable plate 17 and is rotatably connected to the strain gauge 9, the movable plate 17 and the mounting plate 16 are slidably connected, and the screw 6 and the fixed block 5 are threadedly connected, by pulling the first traction steel rope 18 or the second traction steel rope 19, the screw 6 is driven to rotate clockwise or counterclockwise. When the screw 6 is screwed into the fixed block 5, the screw 6 will indirectly pull the strain gauge 9. By precisely adjusting the screws 6 around the fixed block 5, the strain gauge 9 at the four positions is ensured to be subjected to uniform force, thereby realizing the function of calibrating the four strain gauges 9.

[0033] like Figure 2 , Figures 3-10 As shown, after calibration, when the superheater pipe 1 is in operation, the base 7 and connecting block 8 prevent the strain gauge 9 from directly contacting the superheater pipe 1, thereby reducing the impact of high temperature on the strain gauge 9. When the superheater pipe 1 deforms due to heat load, the material of the superheater pipe 1 generates stress due to resistance to deformation, causing the strain gauge 9 to deform in tandem with the pipe deformation. The strain gauge 9 will be stretched or compressed slightly, causing a change in the resistance value of the strain gauge 9. The resistance value of the strain gauge 9 is detected by an external detector, thereby enabling real-time detection of the stress in the superheater pipe 1. Since there are gaps between the outer wall of the strain gauge 9 and the inner wall of the first connecting plate 10 and the first outer bushing 11, the strain gauge 9 can be adapted to the stretching or compression of the strain gauge 9 when the stress in the superheater pipe 1 changes. The first connecting pipe 1401 and the first connecting cover 1402 are used to seal both sides of the first connecting plate 10, and the second connecting pipe 1403 and the second connecting cover 1404 are used to seal both sides of the second connecting plate 12. The first connecting pipe 1401 and the first connecting cover 1402 can maintain a loosely hinged connection with the second connecting pipe 1403 and the second connecting cover 1404, ensuring thermal insulation performance while allowing the device to adapt to stress changes. This device monitors the stress state of the superheater, providing crucial data support for boiler energy efficiency management and preventative maintenance, preventing energy waste due to component failure, and ensuring the boiler always operates at high efficiency. It is a key auxiliary device for achieving efficient and energy-saving boiler operation.

[0034] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A boiler superheater stress detector, comprising superheater pipes (1) and side plates (2), characterized in that, The side plate (2) is disposed on the side of the superheater pipe (1). A connecting shaft (3) is rotatably connected to the side plate (2). A connecting plate (4) is fixedly connected to the side of the connecting shaft (3). A fixing block (5) is installed on the connecting plate (4). Screws (6) are installed around the fixing block (5). A closing assembly (14) is disposed on the screws (6). A first connecting plate (10) is fixedly disposed on the closing assembly (14). A first outer bushing (11) is fixedly connected to the first connecting plate (10). A second outer bushing is disposed on the outside of the first outer bushing (11). The second outer bushing (13) is fixedly connected to a second connecting plate (12). The second connecting plate (12) and the inner side of the first connecting plate (10) are provided with strain gauges (9). A connecting block (8) is fixedly provided on the strain gauge (9). A base (7) is provided on the connecting block (8). The base (7) is fixedly connected to the superheater pipe (1). An opening (15) is provided on the side of the second outer bushing (13). An installation plate (16) is provided in the opening (15). A movable plate (17) is provided on the side of the installation plate (16).

2. A boiler superheater stress detector according to claim 1, characterized in that, The connecting shaft (3), connecting plate (4) and fixing block (5) are fixedly connected as an integral structure, and the side plate (2), connecting shaft (3) and connecting plate (4) are symmetrically distributed on both sides of the fixing block (5).

3. A boiler superheater stress detector according to claim 1, characterized in that, The screw (6) and the fixing block (5) are connected by a thread, and the position and number of the screw (6) correspond one-to-one with the position and number of the strain gauge (9).

4. A boiler superheater stress detector according to claim 1, characterized in that, The screw (6) passes through the movable plate (17) and is rotatably connected to the strain gauge (9). The movable plate (17) and the mounting plate (16) are slidably connected, and the mounting plate (16) and the second outer bushing (13) are slidably connected.

5. A boiler superheater stress detector according to claim 1, characterized in that, A first traction steel rope (18) and a second traction steel rope (19) are fixedly connected to the screw (6). The first traction steel rope (18) and the second traction steel rope (19) are wound in opposite directions on the screw (6).

6. A boiler superheater stress detector according to claim 1, characterized in that, The base (7) and the connecting block (8) are symmetrically distributed on both sides of the strain gauge (9), and the base (7) is connected to the superheater pipe (1) by welding.

7. A boiler superheater stress detector according to claim 6, characterized in that, The base (7), connecting block (8) and strain gauge (9) are fixedly connected as an integral structure, and there are gaps between the outer wall of the strain gauge (9) and the inner wall of the first connecting plate (10) and the first outer bushing (11).

8. A boiler superheater stress detector according to claim 1, characterized in that, The first connecting plate (10), the first outer bushing (11), the second connecting plate (12) and the second outer bushing (13) are all made of ceramic material. The first outer bushing (11) and the second outer bushing (13) are both arc-shaped. There is a gap between the outer wall of the first outer bushing (11) and the inner wall of the second outer bushing (13).

9. A boiler superheater stress detector according to claim 1, characterized in that, The closing assembly (14) includes a first connecting pipe (1401) fixedly connected to the upper and lower sides of the first connecting plate (10), a first connecting cover (1402) fixedly connected to the first connecting pipe (1401), a second connecting pipe (1403) fixedly connected to the upper and lower sides of the second connecting plate (12), and a second connecting cover (1404) fixedly connected to the second connecting pipe (1403).

10. A boiler superheater stress detector according to claim 9, characterized in that, The first connecting pipe (1401), the first connecting cover (1402), the second connecting pipe (1403) and the second connecting cover (1404) are all made of ceramic material. The first connecting cover (1402) and the second connecting cover (1404) are both hemispherical structures with cut surfaces on the sides. The first connecting cover (1402) and the second connecting cover (1404) are both provided with wire holes (1405).

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