Detection device for boiler dissimilar steel welding seam detection

Abstract

The invention relates to a detection device for boiler dissimilar steel welding seam detection, which comprises a box body, a support, an inertial sensor, a probe, a control system and a probe posture adjusting device, the probe, the inertial sensor, the control system and the probe posture adjusting device are arranged in the box body, the box body is arranged above the support, and the support is arranged above the support. The output end of the probe posture adjusting device is connected with the probe, the probe, the inertial sensor and the probe posture adjusting device are connected with the control system, and the control system controls the action of the probe posture adjusting device based on data transmitted by the inertial sensor. By arranging the inertial sensor and the controller, the shaking direction generated when a worker holds the device by hand can be detected through the inertial sensor, an electric signal is transmitted to the controller through a wire, and the controller transmits information to the first telescopic rod and the second telescopic rod through the electric signal as well; it is ensured that the probe can be stably attached to the to-be-detected area.

Description

Technical Field

[0001] The present invention relates to the technical field of nondestructive testing, and in particular to a testing device for testing boiler heterogeneous steel welds. Background Art

[0002] Steel used in thermal power units is mainly divided into two categories: ferritic steel (including pearlite, bainite, martensite and dual-phase steel) and austenitic steel. In order to ensure the safe operation of the unit, the high-temperature section of the boiler convection tube bundle mainly uses austenitic heat-resistant steel, but these steels are expensive, so from an economic point of view, generally the boiler heating surface tubes with a wall temperature exceeding 580°C use austenitic heat-resistant steel, while the parts below 580°C use ferritic heat-resistant steel. Therefore, in the superheater and reheater structure of the power station boiler, a large number of dissimilar steel joints are inevitably present.

[0003] Due to the mismatch of linear expansion coefficients of austenitic stainless steel and ferritic steel, the residual stress in the welded joint is difficult to eliminate even after heat treatment; carbon migration occurs under high temperature conditions, which is very easy to cause cracks; at the same time, the presence of the transition layer will also lead to reduced plasticity and increased brittleness in the fusion zone. Different service environments, such as low-nitrogen transformation, forced ventilation, frequent start-stop, structural stress, over-temperature operation, peak-shaving operation, etc., will cause early failure of dissimilar steel welds, leading to unplanned shutdown of power plants and huge economic losses.

[0004] The existing inspection teams regularly perform flaw detection on equipment using handheld ultrasonic testing instruments. However, for thermal power boilers, boilers on higher floors need to be inspected by climbing scaffolding. In addition, some boiler sections are not regular-shaped walls, and flaw detection on such walls requires adjusting the angle, which, combined with the higher detection height, poses a safety hazard to the inspection personnel. Summary of the invention

[0005] In accordance with the technical problems raised above, a detection device for detecting welds of dissimilar steels in boilers is provided.

[0006] The technical means adopted by the present invention are as follows:

[0007] A detection device for detecting heterogeneous steel welds of boilers comprises: a box, a bracket, an inertial sensor, a probe, a control system and a probe attitude adjustment device, wherein the probe, the inertial sensor, the control system and the probe attitude adjustment device are arranged in the box, and the box is arranged above the bracket. The output end of the probe attitude adjustment device is connected to the probe, and the probe, the inertial sensor and the probe attitude adjustment device are connected to the control system. Based on data transmitted by the inertial sensor, the control system controls the action of the probe attitude adjustment device.

[0008] Furthermore, the probe posture adjustment device includes a first telescopic rod and a second telescopic rod, the bottom surface of the first telescopic rod is fixedly connected to the inner wall of the box body, the telescopic end of the first telescopic rod is fixedly connected to a push plate, a fixed block is arranged above the push plate, the inner wall of the fixed block is connected to the probe, and the bottom surface of the fixed block is connected to the upper surface of the push plate; a slideway is provided on the box body, the second telescopic rod is installed on the sliding block, the output end of the second telescopic rod is connected to the fixed block, and the sliding block can move up and down along the slide.

[0009] Furthermore, an inner frame is arranged inside the box body, the inertial sensor and the control system are both mounted on a vertical plate, and the vertical plate is mounted on the inner frame.

[0010] Furthermore, the bracket includes a main rod and several branch rods, the upper end of the main rod is connected to the bottom end of each branch rod, the top end of each branch rod is connected to the box body, the bottom of the main rod is provided with a mounting plate and a threaded shaft, the main rod is installed on the mounting plate through the threaded shaft, and a rubber pad is also provided between the main rod and the mounting plate.

[0011] Furthermore, the bottom of the mounting plate is connected to the bottom structure via a ball-jointed universal coupling.

[0012] Furthermore, a temperature sensor is arranged above the outer surface of the box, and the temperature sensor is connected to the control system.

[0013] Furthermore, a display is provided above the outer surface of the box, and the display is connected to the control system.

[0014] Compared with the prior art, the present invention has the following advantages: the present invention is provided with an inertial sensor and a controller, so that the inertial sensor can be used to detect the shaking direction generated when the staff holds the device, and the electrical signal is transmitted to the controller through the wire. The controller also transmits information to the first telescopic rod and the second telescopic rod through the electrical signal, so that the fixed block and the probe fixed on the inner wall of the fixed block can be pushed to move by the first telescopic rod and the second telescopic rod, so as to ensure that the probe can stably fit the area to be inspected. In addition, when it is necessary to inspect the boiler wall at a high place, the height of the bottom structure is controlled to raise the device as a whole. For the boiler wall with a certain inclination, the inertial sensor can still be used for detection, so that when the device is in a state where the height and inclination are different from the vertical wall, the degree of fit between the probe and the position to be inspected can be guaranteed, thereby increasing the accuracy of flaw detection and reducing the danger caused by the inspection personnel climbing up. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the rectangular box of the present invention;

[0018] Figure 3 It is a three-dimensional structural diagram of the controller of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of a rectangular frame of the present invention;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the first telescopic rod of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the threaded shaft of the present invention.

[0022] In the figure: 1. box body; 2. probe posture adjustment device; 201. second telescopic rod; 202. slide; 203. sliding block; 204. ultrasonic probe; 205. fixing block; 206. push plate; 207. first telescopic rod; 301. vertical plate; 303. controller (control system); 304. buckle limit plate; 305. inertial sensor; 306. internal frame; 4. temperature sensor; 5. fixing seat; 6. baffle; 7. handle; 8. bracket; 13. fixing part; 14. fixing frame; 15. rotating shaft; 16. knob; 17. display; 18. sliding groove; 19. threaded shaft; 20. rubber pad; 21. mounting plate. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] like Figures 1 to 6 As shown, an embodiment of the present invention discloses a detection device for detecting heterogeneous steel welds of boilers, comprising: a box 1, a bracket 8, an inertial sensor 305, a probe 204, a control system 303 and a probe attitude adjustment device 2, wherein the probe, the inertial sensor, the control system and the probe attitude adjustment device are arranged in the box, the box is arranged above the bracket, the output end of the probe attitude adjustment device is connected to the probe, the probe, the inertial sensor and the probe attitude adjustment device are connected to the control system, and the control system controls the action of the probe attitude adjustment device based on data transmitted by the inertial sensor.

[0031] The probe posture adjustment device includes a first telescopic rod 207 and a second telescopic rod 201, the bottom surface of the first telescopic rod is fixedly connected to the inner wall of the box body, the telescopic end of the first telescopic rod is fixedly connected to a push plate 206, a fixed block 205 is arranged above the push plate, the inner wall of the fixed block is connected to the probe, and the bottom surface of the fixed block is connected to the upper surface of the push plate; a slideway 202 is provided on the box body, the second telescopic rod is installed on the sliding block 203, the output end of the second telescopic rod is connected to the fixed block, and the sliding block can move up and down along the slide.

[0032] In order to facilitate maintenance, an internal frame 306 is provided inside the box, and the inertial sensor and control system are both installed on the vertical plate 301, and the vertical plate is installed on the internal frame. After the internal frame is installed on the box, it is installed on the box through the baffle 6 to block it, and a handle 7 is provided on the outside of the baffle. A sliding groove 18 is provided on the box, and a slider is provided on the vertical plate. The slider can move along the sliding groove, and a locking member is provided on the slider. After the vertical plate is installed inside the box, it is fixed by the locking member. Specifically, the locking member can be a bolt or a nut. A screw hole is provided on the slider, and a screw hole matching the bolt is provided on the box.

[0033] The bracket includes a main rod and several support rods. The upper end of the main rod is connected to the bottom end of each support rod, and the top end of each support rod is connected to the box. A mounting plate and a threaded shaft 19 are provided at the bottom of the main rod. The main rod is installed on the mounting plate 21 through the threaded shaft. A rubber pad 20 is also provided between the main rod and the mounting plate.

[0034] The bottom of the mounting plate is connected to the bottom structure through a ball-jointed universal coupling.

[0035] The detection of the boiler wall temperature is also an important part of the inspection. Therefore, as a preferred embodiment, a temperature sensor 4 is also provided above the outer surface of the box body, and the temperature sensor is connected to the control system. The temperature sensor is installed through a fixing seat 5.

[0036] A fixing member 13 is arranged above the outer surface of the box, specifically a strip-shaped fixing member, in which a rotating shaft 15 is arranged, the rotating shaft is connected to a fixing frame 14, and a display 17 is also arranged, the display is installed in the fixing frame, and the display is connected to a control system. The end of the rotating shaft is connected to a knob 16, and the rotation angle of the display is adjusted by the knob.

[0037] As an optional implementation, the control system is packaged as a modular structure and is mounted on the vertical plate via a rotatable snap-on limit plate 304 .

[0038] In this embodiment, the bracket is in a detachable state. Specifically, screw holes are provided on the support rod, and screw holes are provided on the box body, and the two are connected by bolts. Specifically, it can be divided into a ground working state and a high-altitude continuous working state. The ground working state means that the inspector holds the device and detects the boiler wall through the probe. The inspector can adjust the angle of the display for easy observation. The high-altitude continuous working state means that the boiler wall at a higher position needs to be inspected. At this time, the inspector can install the bracket and set an extended rod under the bracket to remotely control the rotation angle of the ball-jointed universal coupling, so that the device can be raised to a high place for detection of the boiler wall. In addition, the device can be directly installed on the rod for a long time, and the boiler wall can be inspected remotely regularly.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detection device for detecting welds of dissimilar steels of boilers, characterized in that: include: A box, a bracket, an inertial sensor, a probe, a control system and a probe attitude adjustment device, wherein the probe, the inertial sensor, the control system and the probe attitude adjustment device are arranged in the box, and the box is arranged above the bracket. The output end of the probe attitude adjustment device is connected to the probe, and the probe, the inertial sensor and the probe attitude adjustment device are connected to the control system. Based on the data transmitted by the inertial sensor, the control system controls the action of the probe attitude adjustment device.

2. The detection device for detecting boiler heterogeneous steel welds according to claim 1, characterized in that: The probe posture adjustment device includes a first telescopic rod and a second telescopic rod, the bottom surface of the first telescopic rod is fixedly connected to the inner wall of the box body, the telescopic end of the first telescopic rod is fixedly connected to a push plate, a fixed block is arranged above the push plate, the inner wall of the fixed block is connected to the probe, and the bottom surface of the fixed block is connected to the upper surface of the push plate; a slideway is provided on the box body, the second telescopic rod is installed on the sliding block, the output end of the second telescopic rod is connected to the fixed block, and the sliding block can move up and down along the slide.

3. The detection device for detecting welds of dissimilar steels of boilers according to claim 1, characterized in that: An inner frame is arranged inside the box body, the inertial sensor and the control system are both mounted on a vertical plate, and the vertical plate is mounted on the inner frame.

4. The detection device for detecting welds of different types of steel in boilers according to claim 1, characterized in that: The bracket includes a main rod and several support rods. The upper end of the main rod is connected to the bottom end of each support rod, and the top end of each support rod is connected to the box. A mounting plate and a threaded shaft are provided at the bottom of the main rod. The main rod is installed on the mounting plate through the threaded shaft. A rubber pad is also provided between the main rod and the mounting plate.

5. The detection device for detecting welds of different types of steel in boilers according to claim 4, characterized in that: The bottom of the mounting plate is connected to the bottom structure through a ball-jointed universal coupling.

6. The detection device for detecting welds of different types of steel in boilers according to claim 1, characterized in that: A temperature sensor is also arranged above the outer surface of the box body, and the temperature sensor is connected to the control system.

7. The detection device for detecting welds of different types of steel in boilers according to claim 1, characterized in that: A display is also arranged above the outer surface of the box, and the display is connected to the control system.

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