A foreign object detection device and method for the heating surface of a boiler furnace in a thermal power plant.

Abstract

This invention relates to the field of pipeline inspection technology, and discloses a foreign object detection device and method for the heating surface of a boiler furnace in a thermal power plant. The device includes a base plate and a detection pipe mounted on its surface, with a manifold at the end of the detection pipe. The invention achieves precise adjustment of the injection angle by pulling a push rod, which in turn drives a swing rod to rotate, and the swing rod drives an ultrasonic transducer to rotate flexibly around a positioning seat. Simultaneously, the positioning column can rotate under the action of the push rod, causing the ultrasonic transducer to adjust its radial position within the detection pipe, adapting to the inspection needs of pipes of different diameters. The angle adjustment and radial position adjustment work together, combined with multiple multi-angle inspection operations, to comprehensively scan every area inside the detection pipe, eliminating blind spots caused by single-angle inspection. It also solves problems such as ambiguity and easy ball jamming in traditional ball-passing tests, and difficulty and jamming in complex pipes with endoscope inspection methods, thus improving the detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of pipeline inspection technology, specifically, it relates to a foreign object detection device and method for the heating surface of a boiler furnace in a thermal power plant. Background Technology

[0002] In the operation of thermal power plants, the safe and stable operation of the boiler furnace heating surfaces is crucial. However, due to factors in various stages such as manufacturing, installation, and operation, foreign objects often appear inside the heating surface pipes, such as debris left over from manufacturing and installation, and oxide scale generated during operation. These foreign objects can not only cause pipe blockage, leading to abnormal increases in pipe wall temperature and reducing the service life of the boiler tubes, but in severe cases, they can even cause boiler tube rupture, resulting in unplanned unit shutdowns and causing huge economic losses to the power plant, but also affect the stability of the power supply.

[0003] Currently, there are many challenges in detecting foreign objects on the heating surfaces of boiler furnaces. Traditional ball-passing test devices can inspect pipes to some extent, but they rely solely on the smoothness of the ball as it passes through the pipe to determine foreign objects, resulting in a vague assessment that fails to provide a clear visual representation of the foreign object's condition within the pipe. For example, in pipes with long runs and numerous right-angle bends, the ball may not be able to pass through the entire pipeline smoothly, making foreign object detection difficult and posing a risk of the ball becoming stuck inside the pipe. While endoscope inspection is suitable for pipes with short runs and no right-angle bends, the endoscope cannot pass through complex pipes and is prone to becoming stuck inside.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A foreign object detection device for the furnace heating surface of a thermal power plant boiler includes a base plate and a detection pipe mounted on its surface, with a header provided at the end of the detection pipe.

[0007] A pressure plate is slidably disposed on the base plate, and three pairs of insert rods are inserted into the pressure plate. Each pair of insert rods corresponds to the end face of the detection pipe. A corresponding swing arm is rotatably installed on the inner side wall of the pressure plate, and an outer expansion plate is installed at the end of the swing arm. A rocker arm is rotatably installed at the bottom of the outer expansion plate. A pull rod that moves synchronously with the insert rod is rotatably installed on the rocker arm. The movement of the insert rod drives the pull rod to move synchronously, and the rocker arm drives the outer expansion plate to press against the inner wall of the detection pipe for adjusting the concentric position.

[0008] A positioning column is rotatably mounted on the pressure plate, and an ultrasonic transducer with a built-in ultrasonic sensor is rotatably mounted on the positioning column. A push rod is inserted into the positioning column, and the push rod drives the ultrasonic transducer to change its angle through the positioning column. The end of the push rod is slidably connected to a swing rod installed at the rotation center of the ultrasonic transducer, which is used to adjust the incident angle of the ultrasonic transducer.

[0009] In a preferred embodiment of the present invention, a base is mounted on the bottom of the substrate. The base is in the shape of a boss. Adjusting rods are screwed onto the four corners of the base. A support plate is mounted on the bottom of the adjusting rods. The substrate is adjusted to be in a horizontal state by adjusting the adjusting rods.

[0010] In a preferred embodiment of the present invention, a pair of mounting plates are mounted on the substrate, a vertical plate is mounted on the pair of mounting plates, and an arc-shaped clamping plate is mounted on the vertical plate. The mounting plates, vertical plates, and arc-shaped clamping plates are integrally cast. An arc-shaped cover plate is bolted to the arc-shaped clamping plate. The arc-shaped cover plate and the arc-shaped clamping plate are used to clamp the detection pipe. The arc shape of the inner sidewall of the arc-shaped cover plate and the arc-shaped clamping plate is the same.

[0011] In a preferred embodiment of the present invention, a pair of fixed seats are mounted on the base plate, and a lead screw shaft is screwed between the pair of fixed seats. An internal hexagonal knob is mounted at the end of the lead screw shaft, and a sliding plate is screwed onto the lead screw shaft. A side plate is mounted on the sliding plate, and the side plate is movably inserted into the bottom of the pressure plate. The pressure plate slides on the side plate to adjust the height of the pressure plate. Guide rods are installed through both ends of the sliding plate, and the two ends of the guide rods are connected to the side walls of the fixed seats.

[0012] In a preferred embodiment of the present invention, each of the insert rods is provided with an insert plate at its end, and a storage spring is sleeved on the insert rod. One end of the storage spring is snapped into the side wall of the pressure plate, and the other end of the storage spring is snapped into the insert plate. A connecting frame is installed on the insert plate, and the end of the connecting frame is connected to the pull rod, and the pull rod and the pressure plate are movably connected through each other. A synchronization frame is installed on the connecting frame.

[0013] In a preferred embodiment of the present invention, a connecting seat is rotatably mounted at the end of the swing arm, the end of the connecting seat is mounted on the inner side wall of the pressure plate, and an auxiliary arm is rotatably mounted on the connecting seat. The end of the auxiliary arm is rotatably connected to the outer expansion plate. The auxiliary arm and the swing arm are parallel to each other and have the same length. The auxiliary arm is used to ensure that the outer expansion plate is always in a parallel state. A fixing block is mounted at the end of the pull rod, and the end of the fixing block is rotatably connected to the rocker arm.

[0014] In a preferred embodiment of the present invention, a through groove is provided on the pressure plate, and a positioning post is inserted into the through groove. A sliding groove is installed on the inner side wall of the through groove, and a sliding rail is installed on the side wall of the positioning post. The sliding rail is slidably disposed in the sliding groove. A positioning seat is installed at the end of the positioning post, and a housing is rotatably installed on the positioning seat. The housing is connected to an ultrasonic transducer, and a signal line is connected to the ultrasonic transducer. The signal line is connected to a data processing system. The ultrasonic transducer is a transceiver integrated ultrasonic transducer.

[0015] In a preferred embodiment of the present invention, a top plate is installed at one end of the top rod, a compression spring is sleeved on the top rod, one end of the compression spring is snapped onto the top plate, the other end of the compression spring is snapped onto the positioning post, and a pull ring is installed at the end of the top plate, and the surface of the pull ring is knurled.

[0016] In a preferred embodiment of the present invention, a positioning plate is installed at the other end of the top rod, and sliding rods are installed at both ends of the positioning plate. The swing rod forms a 90-degree angle with the ultrasonic transducer. A strip groove is provided on the swing rod, and the sliding rod is slidably disposed in the strip groove.

[0017] As a preferred embodiment of the present invention, the method for detecting foreign objects on the heating surface of a thermal power plant boiler furnace comprises the following steps:

[0018] Step 1: Place the test pipe between the arc-shaped clamp and the arc-shaped cover plate, and tighten the arc-shaped cover plate with bolts to complete the fixing of the test pipe;

[0019] Step 2: Turn the hexagonal knob to drive the lead screw shaft to rotate, causing the slide to move along the guide rod. The side plate drives the pressure plate to approach the detection pipe until the insertion rod contacts and presses against the end face of the detection pipe. At this time, the insertion rod moves inward to the pressure plate, driving the connecting frame, synchronous frame and pull rod to move synchronously. The pull rod causes the outer expansion plate to press against the inner wall of the detection pipe through the rocker arm, completing the concentric position adjustment.

[0020] Step 3: Pull the top rod with the pull ring. Under the action of the compression spring, the positioning plate at the end of the top rod drives the slide rod to slide in the strip groove of the swing rod, so that the swing rod drives the ultrasonic transducer to rotate around the positioning seat and adjust its injection angle; at the same time, rotate the top rod to drive the positioning column to slide along the slide groove in the through groove and adjust the radial position of the ultrasonic transducer in the detection pipeline.

[0021] Step 4: Repeat the angle adjustment operation in Step 3, adjusting the incident angle of the ultrasonic transducer to multiple different positions. At each angle, fine-tune the radial position to ensure a comprehensive scan of different areas inside the detection pipe.

[0022] Step 4: At each adjusted angle and position, activate the ultrasonic transducer. Its built-in ultrasonic sensor emits ultrasonic waves, which propagate within the detection pipe. Upon encountering a foreign object, the waves are reflected, and the reflected signal is transmitted to the data processing system via a signal line. The system comprehensively analyzes and processes the detection data from multiple angles and positions to determine the presence and specific location of the foreign object, thus completing the detection.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention achieves precise adjustment of the injection angle by pulling a top rod, which in turn drives a swing rod to rotate, and the swing rod in turn drives the ultrasonic transducer to rotate flexibly around the positioning seat. This allows for coverage of multiple angular directions from the pipe axis to the inner wall. Simultaneously, the positioning column can rotate under the action of the top rod, causing the ultrasonic transducer to adjust its radial position within the tested pipe, adapting to the testing needs of pipes with different diameters. The angle adjustment and radial position adjustment work together, combined with multiple multi-angle testing operations, to comprehensively scan and test every area inside the pipe, eliminating blind spots caused by single-angle or fixed-position testing. It also solves problems such as ambiguity and easy ball jamming in traditional ball-passing tests, and difficulty and jamming in complex pipes with endoscope inspection methods, thus improving the accuracy of testing and ensuring the safe and stable operation of the heating surfaces of boiler furnaces in thermal power plants.

[0025] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0026] In the attached diagram:

[0027] Figure 1 A three-dimensional diagram of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant.

[0028] Figure 2 This is an overall diagram of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant.

[0029] Figure 3 This is a diagram showing the connection of an arc-shaped clamping plate for a foreign object detection device on the heating surface of a boiler furnace in a thermal power plant.

[0030] Figure 4 A partial view of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 1 ;

[0031] Figure 5 A cross-sectional view of the pressure plate of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 1 ;

[0032] Figure 6 A partial view of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 2 ;

[0033] Figure 7 A cross-sectional view of the pressure plate of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 2 ;

[0034] Figure 8 A partial view of a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 3 ;

[0035] Figure 9 A foreign object detection device for the heating surface of a boiler furnace in a thermal power plant. Figure 8 Enlarged view of point A in the middle.

[0036] In the picture:

[0037] 1. Base plate; 11. Base; 111. Adjusting rod; 112. Support plate; 12. Arc-shaped clamp; 121. Arc-shaped cover plate; 122. Vertical plate; 123. Mounting plate; 13. Fixed seat; 131. Lead screw shaft; 132. Guide rod; 133. Hexagonal knob; 134. Slide plate; 135. Side plate; 14. Inspection pipe; 141. Manifold;

[0038] 2. Pressure plate; 21. Insert rod; 211. Insert plate; 212. Storage spring; 213. Connecting frame; 214. Synchronizing frame; 22. Outer expansion plate; 221. Swing arm; 222. Connecting seat; 223. Auxiliary arm; 23. Pull rod; 231. Fixing block; 232. Rocker arm;

[0039] 3. Positioning pin; 31. Slide rail; 311. Slide groove; 312. Through groove; 32. Top rod; 321. Top plate; 322. Compression spring; 323. Pull ring; 33. Ultrasonic transducer; 331. Housing; 332. Signal line; 333. Positioning seat; 34. Swing rod; 341. Strip groove; 342. Slide rod; 343. Positioning plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention. Example 1:

[0041] like Figures 1 to 9 As shown, a foreign object detection device for the heating surface of a boiler furnace in a thermal power plant includes a base plate 1 and a detection pipe 14 mounted on its surface, with a header 141 provided at the end of the detection pipe 14.

[0042] A pressure plate 2 is slidably mounted on the base plate 1. Three pairs of insert rods 21 are inserted into the pressure plate 2, each pair of insert rods 21 corresponding to the end face of the detection pipe 14. A corresponding swing arm 221 is rotatably mounted on the inner wall of the pressure plate 2, and an outer expansion plate 22 is mounted at the end of the swing arm 221. A rocker arm 232 is rotatably mounted at the bottom of the outer expansion plate 22. A pull rod 23 that moves synchronously with the insert rod 21 is rotatably mounted on the rocker arm 232. The movement of the insert rod 21 drives the pull rod 23 to move synchronously, and the rocker arm 232 drives the outer expansion plate 22 to press against the inner wall of the detection pipe 14 to adjust the concentric position. Through the linkage of the insert rod 21, pull rod 23, rocker arm 232 and outer expansion plate 22, the concentric adjustment of the device and the detection pipe 14 can be quickly realized, ensuring that the detection reference is consistent and improving the detection accuracy. The swing arm 221 can stably support the outer expansion plate 22 to avoid deviation during the adjustment process.

[0043] A positioning post 3 is rotatably mounted on the pressure plate 2. An ultrasonic transducer 33 with a built-in ultrasonic sensor is rotatably mounted on the positioning post 3. A push rod 32 is inserted into the positioning post 3. The push rod 32 drives the ultrasonic transducer to change its angle through the positioning post 3. The end of the push rod 32 is slidably connected to a swing rod 34 mounted at the rotation center of the ultrasonic transducer 33, which is used to adjust the injection angle of the ultrasonic transducer. Through the sliding cooperation between the push rod 32 and the swing rod 34, the injection angle of the ultrasonic transducer 33 can be flexibly adjusted, which facilitates scanning of different directions inside the detection pipe 14 and reduces the detection blind zone. The positioning post 3 provides stable support for the ultrasonic transducer 33 and ensures structural stability during the angle adjustment process.

[0044] like Figures 1 to 9 As shown in the specific embodiment, a base 11 is mounted on the bottom of the substrate 1. The base 11 is in the shape of a boss. Adjusting rods 111 are screwed onto the four corners of the base 11. A support plate 112 is mounted on the bottom of the adjusting rods 111. The substrate 1 is adjusted to be in a horizontal state by adjusting the adjusting rods 111 and the support plate 112. By cooperating with the adjusting rods 111 and the support plate 112, the horizontality of the substrate 1 can be flexibly adjusted to ensure that the whole device is in a stable detection state and to avoid detection errors caused by the tilt of the substrate 1. The boss shape of the base 11 enhances the stability of the connection with the substrate 1.

[0045] like Figures 1 to 9 As shown, furthermore, a pair of mounting plates 123 are mounted on the base plate 1, a vertical plate 122 is mounted on the pair of mounting plates 123, and an arc-shaped clamping plate 12 is mounted on the vertical plate 122. The mounting plates 123, vertical plates 122, and arc-shaped clamping plates 12 are integrally cast. An arc-shaped cover plate 121 is bolted to the arc-shaped clamping plate 12. The arc-shaped cover plate 121 and the arc-shaped clamping plate 12 are used to clamp the detection pipe 14. The arc-shaped cover plate 121 and the arc-shaped clamping plate 12 have the same arc shape on their inner sidewalls. The integrally cast mounting plates 123, vertical plates 122, and arc-shaped clamping plates 12 have high structural strength. Together with the arc-shaped cover plate 121, they can form a stable clamp for the detection pipe 14, avoiding pipe shaking during detection and affecting the results. Moreover, the identical inner arc shape ensures a tight fit with the pipe, improving the reliability of the clamping.

[0046] like Figures 1 to 9As shown, further, a pair of fixed seats 13 are mounted on the base plate 1, and a lead screw shaft 131 is screwed between the pair of fixed seats 13. An internal hexagonal knob 133 is installed at the end of the lead screw shaft 131, and a sliding plate 134 is screwed onto the lead screw shaft 131. A side plate 135 is mounted on the sliding plate 134, and the side plate 135 is movably inserted into the bottom of the pressure plate 2, and the pressure plate 2 slides on the side plate 135 to adjust the height of the pressure plate 2. Guide rods 132 are installed through both ends of the sliding plate 134, and the two ends of the guide rods 132 are connected to the side walls of the fixed seats 13. Through the cooperation of the lead screw shaft 131, the sliding plate 134, and the guide rods 132, the height of the pressure plate 2 can be precisely adjusted. The internal hexagonal knob 133 is easy to operate, the guide rods 132 ensure the smooth movement of the sliding plate 134, and the sliding insertion of the side plate 135 into the pressure plate 2 restricts the movement trajectory of the pressure plate 2, ensuring adjustment accuracy and laying the foundation for subsequent concentric adjustment. Example 2:

[0047] The difference between the above embodiments and this embodiment is that: Figures 1 to 9 As shown, each insertion rod 21 has an insertion plate 211 installed at its end. A storage spring 212 is sleeved on the insertion rod 21. One end of the storage spring 212 is engaged with the side wall of the pressure plate 2, and the other end is engaged with the insertion plate 211. A connecting frame 213 is installed on the insertion plate 211. The end of the connecting frame 213 is connected to the pull rod 23, and the pull rod 23 passes through the pressure plate 2. A synchronization frame 214 is installed on the connecting frame 213. The storage spring 212 provides a restoring force for the insertion rod 21, ensuring that the insertion rod 21 is in close contact with the end face of the detection pipe 14. The synchronization frame 214 ensures that the three pairs of insertion rods 21 move in unison, improving the synchronicity of concentric adjustment. The connecting frame 213 realizes stable transmission between the insertion rod 21 and the pull rod 23, ensuring effective force transmission.

[0048] like Figures 1 to 9 As shown, in a specific embodiment, a connecting seat 222 is rotatably mounted at the end of the swing arm 221. The end of the connecting seat 222 is mounted on the inner side wall of the pressure plate 2. An auxiliary arm 223 is also rotatably mounted on the connecting seat 222. The end of the auxiliary arm 223 is rotatably connected to the outer expansion plate 22. The auxiliary arm 223 and the swing arm 221 are parallel to each other and have the same length. The auxiliary arm 223 is used to ensure that the outer expansion plate 22 is always in a parallel state. A fixing block 231 is mounted at the end of the pull rod 23. The end of the fixing block 231 is rotatably connected to the rocker arm 232. The connecting seat 222 provides a stable rotation fulcrum for the swing arm 221 and the auxiliary arm 223. The parallel and equal-length auxiliary arm 223 and the swing arm 221 can ensure that the outer expansion plate 22 is always in a parallel state, ensuring uniform compression of the inner wall of the detection pipe 14. The fixing block 231 enhances the stability of the connection between the pull rod 23 and the rocker arm 232, preventing it from falling off during transmission. Example 3:

[0049] The difference between the above embodiments and this embodiment is that: Figures 1 to 9 As shown, a through groove 312 is provided on the pressure plate 2, and the positioning post 3 is inserted into the through groove 312. A sliding groove 311 is installed on the inner side wall of the through groove 312, and a sliding rail 31 is installed on the side wall of the positioning post 3. The sliding rail 31 is slidably arranged in the sliding groove 311. A positioning seat 333 is installed at the end of the positioning post 3. A housing 331 is rotatably installed on the positioning seat 333, and the housing 331 is connected to the ultrasonic transducer 33. A signal line 332 is connected to the ultrasonic transducer 33, and the signal line 332 is connected to the data processing system. The ultrasonic transducer 33 is a transceiver ultrasonic transducer. The cooperation between the through groove 312 and the slide rail 31 facilitates the adjustment of the radial position of the positioning column 3, allowing the ultrasonic transducer 33 to cover more areas inside the detection pipe 14. The positioning seat 333 provides a rotation fulcrum for the housing 331 and the ultrasonic transducer 33, ensuring smooth angle adjustment. The signal line 332 enables stable transmission of the detection signal. The integrated transceiver ultrasonic transducer 33 simplifies the structure and improves detection efficiency.

[0050] like Figures 1 to 9 As shown in the specific embodiment, a top plate 321 is installed at one end of the top rod 32. A compression spring 322 is sleeved on the top rod 32. One end of the compression spring 322 is engaged with the top plate 321, and the other end is engaged with the positioning post 3. A pull ring 323 is installed at the end of the top plate 321, and the surface of the pull ring 323 is knurled. The compression spring 322 can realize the automatic reset of the top rod 32, which facilitates the quick adjustment of the angle of the ultrasonic transducer 33. The top plate 321 enhances the contact stability between the top rod 32 and the compression spring 322. The knurled pull ring 323 increases the friction, making it easier for the operator to hold and adjust, thus improving the ease of operation.

[0051] like Figures 1 to 9 As shown, a positioning plate 343 is further installed at the other end of the top rod 32. Slide rods 342 are installed at both ends of the positioning plate 343. The swing rod 34 forms a 90-degree angle with the ultrasonic transducer 33. A strip groove 341 is formed on the swing rod 34, and the slide rod 342 is slidably disposed in the strip groove 341. The positioning plate 343 ensures that the slide rod 342 moves synchronously. The sliding cooperation between the strip groove 341 and the slide rod 342 converts the linear motion of the top rod 32 into the rotation of the swing rod 34, thereby causing the ultrasonic transducer 33 to change angle. The 90-degree angle of the swing rod 34 allows for more precise angle adjustment and improves the controllability of the ultrasonic injection angle.

[0052] This invention also discloses a method for detecting foreign objects on the heating surface of a boiler furnace in a thermal power plant, the steps of which are as follows:

[0053] Step 1: Place the test pipe 14 between the arc-shaped clamp 12 and the arc-shaped cover plate 121, and tighten the arc-shaped cover plate 121 with bolts to complete the fixing of the test pipe 14;

[0054] Step 2: Rotate the hexagonal knob 133 to drive the lead screw shaft 131 to rotate, causing the slide plate 134 to move along the guide rod 132. Through the side plate 135, the pressure plate 2 moves closer to the detection pipe 14 until the insertion rod 21 contacts and presses against the end face of the detection pipe 14. At this time, the insertion rod 21 moves inward to the pressure plate 2, driving the connecting frame 213, the synchronous frame 214 and the pull rod 23 to move synchronously. The pull rod 23 causes the outer expansion plate 22 to press against the inner wall of the detection pipe 14 through the rocker arm 232, completing the concentric position adjustment.

[0055] Step 3: Pull the top rod 32 by the pull ring 323. Under the action of the compression spring 322, the positioning plate 343 at the end of the top rod 32 drives the slide rod 342 to slide in the strip groove 341 of the swing rod 34, so that the swing rod 34 drives the ultrasonic transducer 33 to rotate around the positioning seat 333 and adjust its injection angle; at the same time, rotate the top rod 32 to drive the positioning column 3 to slide along the slide groove 311 in the through groove 312 and adjust the radial position of the ultrasonic transducer 33 in the detection pipe 14.

[0056] Step 4: Repeat the angle adjustment operation in Step 3, and adjust the incident angle of the ultrasonic transducer 33 to multiple different positions. At each angle, the radial position is finely adjusted to ensure a comprehensive scan of different areas inside the detection pipe 14.

[0057] Step 4: At each adjusted angle and position, activate the ultrasonic transducer 33. Its built-in ultrasonic sensor emits ultrasonic waves, which propagate within the detection pipe 14. Upon encountering a foreign object, the ultrasonic waves are reflected, and the reflected signal is transmitted to the data processing system via signal line 332. The system performs comprehensive analysis and processing of the detection data at multiple angles and positions to determine the presence and specific location of the foreign object, thus completing the detection.

[0058] The implementation principle of the foreign object detection device for the furnace heating surface of a thermal power plant boiler according to the present invention is as follows:

[0059] When using the foreign object detection device on the heating surface of a thermal power plant boiler furnace, the support plate 112 must first be adjusted using the adjusting rod 111 at the bottom of the base 11 to ensure the base plate 1 is in a horizontal state, thus ensuring the stability of the subsequent detection process. Then, the detection pipe 14 is placed between the arc-shaped clamping plate 12 and the arc-shaped cover plate 121. The arc-shaped cover plate 121 is then tightened with bolts. The arc-shaped structure of the inner sides of the arc-shaped clamping plate 12 and the arc-shaped cover plate 121 provides a stable clamping effect on the detection pipe 14, preventing it from shaking during detection.

[0060] Next, rotating the hexagonal knob 133 drives the lead screw shaft 131 to rotate. Since the lead screw shaft 131 is threaded into the slide plate 134, and the two ends of the slide plate 134 are limited by the guide rod 132, the slide plate 134 will move smoothly along the guide rod 132, and then drive the pressure plate 2 to move synchronously through the side plate 135 connected to it. Here, the side plate 135 is movably inserted into the bottom of the pressure plate 2 to form a sliding fit structure. This fit strictly limits the movement trajectory of the pressure plate 2, avoiding horizontal deviation or tilting, and ensuring that the pressure plate 2 can accurately approach the detection pipe 14 and move to the corresponding position on its side wall. This lays the foundation for subsequent adjustment of the concentric position of the pressure plate 2 and the detection pipe 14, and ensures that when adjusting the concentricity through the insertion rod 21, pull rod 23, expansion plate 22 and other structures, the adjustment accuracy will not be affected by the positional deviation of the pressure plate 2 itself.

[0061] As the pressure plate 2 moves toward the detection pipe 14, the insertion rod 21 gradually contacts the end face of the detection pipe 14 and generates pressure. At this time, under the pressure, the insertion rod 21 moves toward the inside of the pressure plate 2, driving the connecting frame 213 and the synchronous frame 214 to move synchronously. The synchronous frame 214 ensures that the three pairs of insertion rods 21 move in unison, while the connecting frame 213 drives the pull rod 23 to move. The pull rod 23 causes the outer expansion plate 22 to rotate around the swing arm 221 through the rocker arm 232. At the same time, the auxiliary arm 223 is parallel to the swing arm 221 and of equal length, ensuring that the outer expansion plate 22 is always in a parallel state and stably pressed against the inner wall of the detection pipe 14, thereby adjusting the concentric position of the device and the detection pipe 14 and ensuring that the reference of the ultrasonic test is consistent.

[0062] Once set up, the ultrasonic transducer 33, with its built-in ultrasonic sensor, emits ultrasonic waves. The ultrasonic waves propagate within the detection pipe 14 and are reflected when they encounter foreign objects. The reflected signal is received by the ultrasonic transducer 33 and transmitted to the data processing system via the signal line 332. After system analysis and processing, it can be determined whether there are foreign objects in the detection pipe 14 and the specific location of the foreign objects, thereby completing the foreign object detection work in the detection pipe 14 of the furnace heating surface of the thermal power plant boiler.

[0063] When the position of the ultrasonic transducer 33 needs to be adjusted, the operator pulls the push rod 32 via the pull ring 323. The push rod 32, under the elastic force of the compression spring 322, can flexibly return to its original position. The positioning plate 343 at its end drives the slide rod 342 to slide within the groove 341 of the swing rod 34, thereby causing the swing rod 34 to rotate the ultrasonic transducer 33 around the positioning seat 333, thus adjusting the angle of the ultrasonic transducer 33. This angle adjustment mechanism allows ultrasonic waves to enter the detection pipe 14 from different directions, avoiding blind spots caused by a single angle and ensuring a comprehensive scan of the pipe's inner wall and internal space.

[0064] At the same time, the rotation of the top rod 32 can drive the positioning column 3 to slide along the slide groove 311 in the through groove 312, adjusting the radial position of the ultrasonic transducer 33 in the detection pipe 14. This allows the ultrasonic transducer 33 to cover different areas inside the pipe. Combined with angle adjustment, a three-dimensional detection range is formed, further eliminating detection dead angles. Foreign objects, whether near the center of the pipe or near the inner wall, can be effectively detected.

[0065] Furthermore, the coordination between angle adjustment and radial position adjustment allows the ultrasonic transducer 33 to flexibly adapt to the actual conditions of the inspection pipe 14 (such as pipe diameter, the location of possible foreign objects, etc.). This dual adjustment mechanism greatly improves the flexibility and accuracy of the inspection, ensuring that foreign objects can be accurately identified and located regardless of their position within the pipe, providing a reliable guarantee for the safe operation of the inspection pipe 14 on the heating surface of the boiler furnace in thermal power plants.

Claims

1. A foreign object detection device for the heating surface of a boiler furnace in a thermal power plant, comprising a base plate (1) and a detection pipe (14) mounted on its surface, wherein a manifold (141) is provided at the end of the detection pipe (14), characterized in that: A pressure plate (2) is slidably disposed on the substrate (1). Three pairs of insert rods (21) are inserted into the pressure plate (2). Each pair of insert rods (21) corresponds to the end face of the detection pipe (14). A corresponding swing arm (221) is rotatably installed on the inner side wall of the pressure plate (2). An outer expansion plate (22) is installed at the end of the swing arm (221). A rocker arm (232) is rotatably installed at the bottom of the outer expansion plate (22). A pull rod (23) that moves synchronously with the insert rod (21) is rotatably installed on the rocker arm (232). The movement of the insert rod (21) drives the pull rod (23) to move synchronously. The rocker arm (232) drives the outer expansion plate (22) to press against the inner wall of the detection pipe (14) to adjust the concentric position. The swing arm (221) is rotatably mounted with a connecting seat (222) at its end. The end of the connecting seat (222) is mounted on the inner side wall of the pressure plate (2). An auxiliary arm (223) is also rotatably mounted on the connecting seat (222). The end of the auxiliary arm (223) is rotatably connected to the outer expansion plate (22). The auxiliary arm (223) is parallel to the swing arm (221) and the two are of the same length. The auxiliary arm (223) is used to ensure that the outer expansion plate (22) is always in a parallel state. A fixing block (231) is mounted at the end of the pull rod (23). The end of the fixing block (231) is rotatably connected to the rocker arm (232). A positioning column (3) is rotatably mounted on the pressure plate (2). An ultrasonic transducer (33) with a built-in ultrasonic sensor is rotatably mounted on the positioning column (3). A top rod (32) is inserted into the positioning column (3). The top rod (32) drives the ultrasonic transducer to change its angle through the positioning column (3). The end of the top rod (32) is slidably connected to a swing rod (34) installed at the rotation center of the ultrasonic transducer (33) to adjust the injection angle of the ultrasonic transducer.

2. The foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, The base (1) is mounted on the bottom of the substrate (1). The base (11) is in the shape of a boss. Adjusting rods (111) are screwed on the four corners of the base (11) and a support plate (112) is mounted on the bottom of the adjusting rods (111). The substrate (1) is adjusted to be in a horizontal state by adjusting the adjusting rods (111).

3. The foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, A pair of mounting plates (123) are mounted on the substrate (1), and a vertical plate (122) is mounted on the pair of mounting plates (123). An arc-shaped clamping plate (12) is mounted on the vertical plate (122). The mounting plates (123), the vertical plate (122) and the arc-shaped clamping plate (12) are integrally cast. An arc-shaped cover plate (121) is mounted on the arc-shaped clamping plate (12) by bolts. The arc-shaped cover plate (121) and the arc-shaped clamping plate (12) are used to clamp the detection pipe (14). The arc-shaped cover plate (121) and the arc-shaped clamping plate (12) have the same arc shape on the inner sidewall.

4. The foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, A pair of fixed seats (13) are installed on the base plate (1). A lead screw shaft (131) is screwed between the pair of fixed seats (13). An internal hexagonal knob (133) is installed at the end of the lead screw shaft (131). A sliding plate (134) is screwed on the lead screw shaft (131). A side plate (135) is installed on the sliding plate (134). The side plate (135) is movably inserted into the bottom of the pressure plate (2), and the pressure plate (2) slides on the side plate (135) to adjust the height of the pressure plate (2). Guide rods (132) are installed through both ends of the sliding plate (134). Both ends of the guide rods (132) are connected to the side wall of the fixed seat (13).

5. A foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, Each of the insert rods (21) is equipped with an insert plate (211) at its end. A storage spring (212) is sleeved on the insert rod (21). One end of the storage spring (212) is snapped into the side wall of the pressure plate (2), and the other end of the storage spring (212) is snapped into the insert plate (211). A connecting frame (213) is installed on the insert plate (211). The end of the connecting frame (213) is connected to the pull rod (23), and the pull rod (23) and the pressure plate (2) are movably connected. A synchronization frame (214) is installed on the connecting frame (213).

6. A foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, The pressure plate (2) has a through groove (312) and the positioning post (3) is inserted into the through groove (312). The inner side wall of the through groove (312) is equipped with a sliding groove (311). The side wall of the positioning post (3) is equipped with a slide rail (31). The slide rail (31) is slidably arranged in the slide groove (311). The end of the positioning post (3) is equipped with a positioning seat (333). The positioning seat (333) is rotatably mounted with a housing (331). The housing (331) is connected to the ultrasonic transducer (33). The ultrasonic transducer (33) is connected with a signal line (332). The signal line (332) is connected to the data processing system. The ultrasonic transducer (33) is a transceiver ultrasonic transducer.

7. A foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, A top plate (321) is installed at one end of the top rod (32). A compression spring (322) is sleeved on the top rod (32). One end of the compression spring (322) is snapped onto the top plate (321), and the other end of the compression spring (322) is snapped onto the positioning post (3). A pull ring (323) is installed at the end of the top plate (321), and the surface of the pull ring (323) is knurled.

8. A foreign object detection device for the heating surface of a thermal power plant boiler furnace according to claim 1, characterized in that, A positioning plate (343) is installed at the other end of the top rod (32). Slide rods (342) are installed at both ends of the positioning plate (343). The swing rod (34) forms a 90-degree angle with the ultrasonic transducer (33). A strip groove (341) is opened on the swing rod (34). The slide rod (342) is slidably disposed in the strip groove (341).

9. A method for detecting foreign objects on the heating surface of a boiler furnace in a thermal power plant, characterized in that, The foreign object detection device for the heating surface of a thermal power plant boiler furnace, as described in any one of claims 1 to 8, and the method for detecting foreign objects on the heating surface of a thermal power plant boiler furnace, comprises the following steps: Step 1: Place the test pipe (14) between the arc-shaped clamp (12) and the arc-shaped cover plate (121), and tighten the arc-shaped cover plate (121) with bolts to complete the fixing of the test pipe (14); Step 2: Rotate the hexagonal knob (133) to drive the lead screw shaft (131) to rotate, causing the slide plate (134) to move along the guide rod (132). Through the side plate (135), the pressure plate (2) is driven to approach the detection pipe (14) until the insertion rod (21) contacts and presses against the end face of the detection pipe (14). At this time, the insertion rod (21) moves to the inside of the pressure plate (2), driving the connecting frame (213), the synchronous frame (214) and the pull rod (23) to move synchronously. The pull rod (23) causes the outer expansion plate (22) to press against the inner wall of the detection pipe (14) through the rocker arm (232), completing the concentric position adjustment. Step 3: Pull the top rod (32) by the pull ring (323). Under the action of the compression spring (322), the positioning plate (343) at the end of the top rod (32) drives the slide rod (342) to slide in the strip groove (341) of the swing rod (34), so that the swing rod (34) drives the ultrasonic transducer (33) to rotate around the positioning seat (333) to adjust its injection angle; at the same time, rotate the top rod (32) to drive the positioning column (3) to slide along the slide groove (311) in the through groove (312) to adjust the radial position of the ultrasonic transducer (33) in the detection pipe (14); Step 4: Repeat the angle adjustment operation in Step 3, and adjust the injection angle of the ultrasonic transducer (33) to multiple different positions. At each angle, the radial position is finely adjusted to ensure that different areas inside the detection pipe (14) are fully scanned. Step 4: At each adjusted angle and position, start the ultrasonic transducer (33), whose built-in ultrasonic sensor emits ultrasonic waves. The ultrasonic waves propagate in the detection pipe (14), and reflect after encountering foreign objects. The reflected signal is transmitted to the data processing system via the signal line (332). The system performs comprehensive analysis and processing on the detection data at multiple angles and positions to determine whether foreign objects exist and their specific locations, and completes the detection.

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