A temperature sensor-based in-situ non-destructive testing device for steam turbine blades

Abstract

The application provides a kind of turbine blade in-situ nondestructive testing device based on temperature sensor, including: machine body, a pair of caterpillar, detector, sliding mechanism and heating mechanism, a pair of caterpillar is located in the opposite sides of machine body, detector is located in the bottom of machine body, sliding mechanism is located in the front end of machine body in a retractable manner along the direction of travel of machine body, heating mechanism is located in the bottom of machine body and heating mechanism is connected to sliding mechanism, along the direction of travel of machine body, heating mechanism is located in front of detector, sliding mechanism has extended state and contracted state, when sliding mechanism is in extended state, part of sliding mechanism and heating mechanism are located outside of machine body, when sliding mechanism is in contracted state, sliding mechanism and heating mechanism are located inside of machine body. By setting sliding mechanism, heating mechanism can be stored inside of machine body, so that caterpillar can climb up the steps, so that the distance between detector at the rear end of machine body and blade step is closer, improve the detection accuracy of device.

Description

Technical Field

[0001] This invention belongs to the field of steam turbine testing technology, specifically relating to an in-situ non-destructive testing device for steam turbine blades based on a temperature sensor. Background Technology

[0002] As a core power component of steam turbines, turbine blades traditionally require disassembly for inspection. Current in-situ inspections of steam turbine blades, even when the entire turbine is in place, typically employ borehole inspection. However, due to the complex internal structure of steam turbines, borehole inspection has limited accessibility, resulting in insufficient accessibility and low accuracy for in-situ inspection technology. A new approach involves using a mobile small robot to penetrate the steam turbine for in-situ inspection. The robot is equipped with a low-power infrared heater that provides localized thermal excitation, raising the blade surface temperature to a certain extent. Due to the thermal barrier effect, defective areas on the blades create a significant temperature difference compared to normal areas. By utilizing the difference in thermal conductivity between the defective and normal areas, temperature monitoring is performed, thereby detecting the location of blade defects.

[0003] The root of the blade is a high-frequency area prone to structural defects. When a mobile small robot moves along the surface of the blade, the infrared heating lamp mounted on the front side of its movement direction can perform thermal excitation treatment on the root of the blade. However, the infrared temperature measurement probe installed on the rear side of the robot is blocked by the overall structure of the detection device, making it difficult to directly target the heated area at the root of the blade to collect temperature signals, which in turn causes the detection data to be deviated. Summary of the Invention

[0004] The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide an in-situ non-destructive testing device for turbine blades based on a temperature sensor.

[0005] This invention provides an in-situ non-destructive testing device for turbine blades based on a temperature sensor, comprising: a body, a pair of tracks, a detector, a sliding mechanism, and a heating mechanism. The pair of tracks are located on opposite sides of the body, the detector is located at the bottom of the body, the sliding mechanism is retractably located at the front end of the body along the traveling direction of the body, and the heating mechanism is located at the bottom of the body and connected to the sliding mechanism. Along the traveling direction of the body, the heating mechanism is located in front of the detector. The sliding mechanism has an extended state and a retracted state. When the sliding mechanism is in the extended state, part of the sliding mechanism and the heating mechanism are located outside the body; when the sliding mechanism is in the retracted state, the sliding mechanism and the heating mechanism are located inside the body.

[0006] In some embodiments of the present invention, the sliding mechanism includes: a spring, an L-shaped sliding plate, and a movable plate. The two ends of the spring are respectively connected to the short plate of the L-shaped sliding plate and the machine body. The L-shaped sliding plate is connected to the machine body in a reciprocating manner along the traveling direction of the machine body. The short plate of the L-shaped sliding plate extends toward the bottom of the machine body. The movable plate is rotatably connected to the short plate of the L-shaped sliding plate. The movable plate is rotatably connected to the heating mechanism. When the sliding mechanism is in the extended state, the angle between the long plate of the L-shaped sliding plate and the movable plate is less than 90 degrees. When the sliding mechanism is in the retracted state, the long plate of the L-shaped sliding plate is parallel to the movable plate.

[0007] In some embodiments of the present invention, the heating mechanism includes a support plate and an infrared heating lamp, the support plate being rotatably connected to the movable plate, the infrared heating lamp being disposed on the support plate, and when the sliding mechanism is in a retracted state, the long plate of the L-shaped sliding plate is parallel to the support plate.

[0008] In some embodiments of the present invention, the heating mechanism further includes a telescopic rod, the two ends of which are respectively hinged to the long plate of the L-shaped sliding plate and the support plate.

[0009] In some embodiments of the present invention, the heating mechanism further includes at least two rollers, and at least one of the rollers is provided on the side of the long plate of the L-shaped sliding plate away from the machine body, and at least one of the rollers is provided on the side of the support plate away from the machine body.

[0010] In some embodiments of the present invention, the device further includes a counterweight mechanism, which is movably connected to the body and connected to the sliding mechanism. The direction of movement of the counterweight mechanism is opposite to that of the sliding mechanism.

[0011] In some embodiments of the present invention, the counterweight mechanism includes: a fixed rod, two telescopic links and two counterweights. One end of the fixed rod is connected to the sliding mechanism, and the other end of the fixed rod is hinged to the two telescopic links respectively. The two telescopic links are rotatably connected to the machine body and rotate in opposite directions. The end of each telescopic link away from the fixed rod is connected to one of the counterweights.

[0012] In some embodiments of the present invention, the counterweight mechanism further includes: a friction block and two friction plates, the friction block being sleeved on the fixed rod and located at one end of the fixed rod near the telescopic connecting rod, the two friction plates being disposed opposite to each other on the machine body, and the friction block cooperating with the two friction plates.

[0013] In some embodiments of the present invention, the body has a first accommodating space and a second accommodating space spaced apart along the length direction of the body, the first accommodating space space having an opening facing the front end of the body, at least a portion of the sliding mechanism being located within the first accommodating space space, and the counterweight mechanism being located within the second accommodating space space.

[0014] In some embodiments of the present invention, the surface of the track is provided with an adsorption element.

[0015] This invention relates to an in-situ non-destructive testing device for turbine blades based on a temperature sensor. The device includes a body, a pair of tracks, a detector, a sliding mechanism, and a heating mechanism. The tracks, spaced apart on the body, travel on the surface of the blade. The heating mechanism heats the area to be tested at the bottom of the body. When the device reaches the root of the blade, the tracks continue to move, increasing the pressure on the contact surface between the front end of the sliding mechanism and the step of the blade. This pressure forces the sliding mechanism to move towards the rear end of the body, meaning the direction of movement of the sliding mechanism is opposite to the direction of travel of the tracks. At this point, the heating mechanism stops heating, and the sliding mechanism drives the heating mechanism to move together towards the rear end of the body. After the sliding mechanism has moved a certain distance towards the rear end of the body, most of the sliding mechanism and most of the heating mechanism are located inside the body. The tracks contact the step of the blade, continue to move, and climb the step. The entire device forms an angle with the blade, and the detector detects the temperature at the corner of the step on the blade. By setting up a sliding mechanism, the heating mechanism can move in the opposite direction of the machine's travel, allowing most of the sliding and heating mechanisms to be housed inside the machine, so that the tracks can climb the steps. At the same time, housing most of the sliding and heating mechanisms inside the machine brings the detector at the rear of the machine closer to the blade step, preventing the sliding and heating mechanisms at the front of the machine from obstructing the detector at the rear, improving the accuracy of the device's detection of the area heated by the heating mechanism, and reducing detection errors. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0017] Figure 2 This is a schematic cross-sectional view of the overall structure of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0018] Figure 3 This is a partial structural schematic diagram (first view) of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0019] Figure 4 This is a partial structural schematic diagram (second perspective) of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0020] Figure 5 This is a partial structural cross-sectional schematic diagram of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0021] Figure 6 This is a schematic diagram of the counterweight mechanism of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0022] Figure 7 This is a schematic diagram of the heating mechanism of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0023] Figure 8 This is a partial structural cross-sectional schematic diagram of the in-situ non-destructive testing device for turbine blades based on a temperature sensor according to the present invention.

[0024] The labels in the attached diagram are as follows:

[0025] 1. Sliding mechanism; 111. L-shaped sliding plate; 112. Moving plate; 121. Slide groove; 122. Spring; 13. Body; 131. First receiving space; 132. Second receiving space; 133. Partition; 134. Inclined surface; 14. Track; 15. Protective shell; 16. Detector; 17. Control panel box; 18. Traction line;

[0026] 2. Counterweight mechanism; 211. Friction block; 212. Fixed rod; 213. Friction plate; 221. Rotating shaft; 222. Telescopic connecting rod; 223. Counterweight block;

[0027] 3. Heating mechanism; 311. Support plate; 312. Infrared heating lamp; 321. Telescopic rod; 322. Roller. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the invention. The described embodiments are some, but not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0029] like Figures 1 to 8As shown, this embodiment of the invention provides an in-situ non-destructive testing device for turbine blades based on a temperature sensor, comprising: a body 13, a pair of tracks 14, a detector 16, a sliding mechanism 1, and a heating mechanism 3. The pair of tracks 14 are located on opposite sides of the body 13. The detector 16 is located at the bottom of the body 13 and is a temperature sensor-based detector, specifically an infrared probe, used to detect temperature changes after the blade is heated. The sliding mechanism 1 is located at the front end of the body 13 in a retractable manner along the traveling direction of the body 13. The heating mechanism 3 is located at the bottom of the body 13 and is connected to the sliding mechanism 1. Along the traveling direction of the body 13, the heating mechanism 3 is located in front of the detector 16. The sliding mechanism 1 has an extended state and a retracted state. When the sliding mechanism 1 is in the extended state, part of the sliding mechanism 1 and the heating mechanism 3 are located outside the body 13. When the sliding mechanism 1 is in the retracted state, the sliding mechanism 1 and the heating mechanism 3 are located inside the body 13.

[0030] According to an embodiment of the present invention, a turbine blade in-situ non-destructive testing device based on a temperature sensor includes a body 13, a pair of tracks 14, a detector 16, a sliding mechanism 1, and a heating mechanism 3. The track 14, which is spaced apart on the body 13, travels on the surface of the blade. The heating mechanism 3 heats the area to be tested at the bottom of the body 13. When the device travels to the root of the blade, the track 14 continues to move, and the pressure on the contact surface between the front end of the sliding mechanism 1 and the step of the blade increases, thereby pressing the sliding mechanism 1 to move towards the rear end of the body 13. That is, the moving direction of the sliding mechanism 1 is opposite to the traveling direction of the track 14. At this time, the heating mechanism 3 stops heating, and the sliding mechanism 1 drives the heating mechanism 3 to move together towards the rear end of the body 13. After the sliding mechanism 1 has moved a certain distance towards the rear end of the body 13, most of the sliding mechanism 1 and most of the heating mechanism 3 are located inside the body 13. The track 14 contacts the step of the blade and continues to move and climb the step. The entire device forms an angle with the blade, and the detector 16 detects the temperature at the corner of the step of the blade. By setting up a sliding mechanism 1, the heating mechanism 3 can move in the opposite direction of the traveling direction of the body 13, so that most of the sliding mechanism 1 and the heating mechanism 3 can be housed inside the body 13, so that the track 14 can climb the steps. At the same time, most of the sliding mechanism 1 and the heating mechanism 3 are housed inside the body 13, so that the distance between the detector 16 located at the rear end of the body 13 and the blade step is closer, preventing the sliding mechanism 1 and the heating mechanism 3 at the front end of the body 13 from blocking the detector 16 at the rear end, improving the detection accuracy of the device on the area heated by the heating mechanism 3, and reducing detection errors.

[0031] like Figure 1 , Figure 5As shown, the outer wall of the machine body 13 is connected to a traction line 18 for powering the entire device. The two tracks 14 on the outer wall of the machine body 13 are arranged in a mirror image and are controlled by independent motors. A control board box 17 is fixedly connected to the outer wall of the machine body 13. The control board is placed inside the control board box 17 to control the overall operation of the device.

[0032] like Figure 3 , Figure 5 , Figure 6 As shown, in some embodiments of the present invention, the body 13 has a first receiving space 131 with an opening toward the front end of the body 13. When the sliding mechanism 1 is in the extended state, the sliding mechanism 1 and the heating mechanism 3 extend from the opening of the first receiving space 131 toward the rear end of the body 13. When the sliding mechanism 1 is in the retracted state, most of the sliding mechanism 1 and most of the heating mechanism 3 are located in the first receiving space 131. When the sliding mechanism 1 changes from the extended state to the retracted state, the sliding mechanism 1 and the heating mechanism 3 move from the opening of the first receiving space 131 toward the interior of the first receiving space 131, that is, toward the rear end of the body 13. Correspondingly, when the sliding mechanism 1 changes from the retracted state to the extended state, the sliding mechanism 1 and the heating mechanism 3 move from the interior of the first receiving space 131 through its opening toward the rear end of the body 13.

[0033] like Figures 2 to 6 As shown, in some embodiments of the present invention, the sliding mechanism 1 includes an L-shaped sliding plate 111, a moving plate 112, and a spring 122. A sliding groove 121 is provided on each of the two opposite inner walls of the first accommodating space 131 of the body 13. The two sliding grooves 121 are arranged opposite to each other. The extension direction of the sliding groove 121 is the same as the travel direction of the body 13, that is, the sliding groove 121 extends from the front end of the body 13 to the rear end of the body 13. The L-shaped sliding plate 111 is slidably connected to the sliding groove 121 of the body 13 so that the L-shaped sliding plate 111 can reciprocate linearly along the travel direction of the body 13 under the restriction of the sliding groove 121. The L-shaped sliding plate 111 is an "L"-shaped plate body, comprising a long plate and a short plate, with the included angle between the long plate and the short plate being 90 degrees. The two sides of the long plate of the L-shaped sliding plate 111 engage with two sliding grooves 121, and the short plate of the L-shaped sliding plate 111 extends towards the bottom of the body 13. A movable plate 112 is rotatably connected to the short plate of the L-shaped sliding plate 111. Specifically, one end of the movable plate 112 is rotatably connected to the short plate of the "L"-shaped plate body, and the other end of the movable plate 112 is rotatably connected to the heating mechanism 3. The two ends of the spring 122 are respectively connected to the short plate of the L-shaped sliding plate 111 and the bottom of the first receiving space 131 of the body 13.

[0034] When the L-shaped sliding plate 111 contacts the step at the root of the blade, it moves away from the step due to the force exerted by the step. That is, the L-shaped sliding plate 111 moves from the front end to the rear end of the body 13. The L-shaped sliding plate 111 drives the moving plate 112 below it to move together. The moving plate 112 drives the heating mechanism 3 connected to it to move from the front end to the rear end of the body 13. In other words, the L-shaped sliding plate 111, through the moving plate 112, drives the heating mechanism 3 to move towards the interior of the body 13, reducing the obstruction of the sliding mechanism 1 and the heating mechanism 3 on the detector 16 behind it and improving detection accuracy. When neither the L-shaped sliding plate 111 nor the heating mechanism 3 is in contact with the step, the L-shaped sliding plate 111 moves towards the front end of the body 13 under the action of the spring 122, thus resetting the sliding mechanism 1 and the heating mechanism 3.

[0035] like Figure 8 As shown, further, the opening of the first accommodating space 131 of the body 13 is provided with an inclined surface 134. The inclined surface 134 is located at the bottom edge of the opening, and the thickness of the inclined surface 134 gradually decreases from the bottom end to the front end of the body 13, so that the cross-sectional area of ​​the opening gradually increases from the rear end to the front end of the body 13. When the sliding mechanism 1 is in the extended state, the angle between the long plate of the L-shaped sliding plate 111 and the moving plate 112 is less than 90 degrees, that is, the long plate of the L-shaped sliding plate 111 and the moving plate 112 are in a non-parallel state. When the sliding mechanism 1 is in the retracted state, the long plate of the L-shaped sliding plate 111 and the moving plate 112 are parallel.

[0036] When the device reaches the root of the blade, the pressure on the contact surface between the front end of the L-shaped sliding plate 111 of the sliding mechanism 1 and the step of the blade increases, thereby pressing the L-shaped sliding plate 111 to move towards the rear end of the machine body 13. That is, the moving direction of the L-shaped sliding plate 111 is opposite to the traveling direction of the track 14. The two springs 122 change from a free state to a compressed state. The moving plate 112 is in contact with the inclined surface 134 of the machine body 13. The L-shaped sliding plate 111 continues to move towards the rear end of the machine body 13. The moving plate 112 moves along the inclined surface 134 of the machine body 13. The moving plate 112 rotates about the connection position between the L-shaped sliding plate 111 and the moving plate 112, thereby moving the side of the moving plate 112 away from the L-shaped sliding plate 111 upwards, supporting the machine. The support plate 311 of the structure moves upward with the moving plate 112. After the sliding mechanism 1 moves a certain distance to the rear end of the body 13, the moving plate 112 rotates to a state parallel to the long plate of the L-shaped sliding plate 111. The support plate 311 of the support mechanism moves to the bottom surface of the first accommodating space 131 of the body 13. The support plate 311 of the support mechanism can be parallel to the long plate of the L-shaped sliding plate 111. The moving plate 112 and the L-shaped sliding plate 111 remain parallel until the track 14 contacts the step. At this time, most of the sliding mechanism 1 and most of the heating mechanism 3 are located inside the body 13. Then the track 14 continues to operate and climbs the step. The entire device forms an angle with the blade. The detector 16 detects the temperature at the corner of the step of the blade.

[0037] like Figure 5 As shown, in some embodiments of the present invention, the heating mechanism 3 includes a support plate 311 and an infrared heating lamp 312. The support plate 311 is rotatably connected to the moving plate 112. The infrared heating lamp 312 is disposed on the support plate 311 and faces away from the top of the body 13, so that the distance between the infrared heating lamp 312 and the blade is smaller, thereby improving the heating efficiency of the infrared heating lamp 312. When the sliding mechanism 1 is in the retracted state, the support plate 311 is parallel to the bottom surface of the first accommodating space 131, that is, the long plate of the L-shaped sliding plate 111 is parallel to the support plate 311. At this time, most of the support plate 311 and most of the infrared heating lamps 312 are located within the first accommodating space 131.

[0038] like Figure 7As shown, in some embodiments of the present invention, the heating mechanism 3 further includes a telescopic rod 321, the two ends of which are respectively hinged to the long plate of the L-shaped sliding plate 111 and the support plate 311. When the L-shaped sliding plate 111 moves toward the rear end of the body 13, and the moving plate 112 changes to a state parallel to the L-shaped sliding plate 111, the telescopic rod 321 moves along with the L-shaped sliding plate 111. The telescopic rod 321 is compressed as the L-shaped sliding plate 111 moves toward the rear end of the body 13. When the angle between the entire device and the blade gradually increases, the contact between the L-shaped sliding plate 111 and the blade step changes to the contact between the support plate 311 and the blade step. When the angle between the entire device and the blade changes from large to small, the support plate 311 is subjected to... As the force exerted by the blade step decreases, the force applied by the support plate 311 to the telescopic rod 321 also decreases. At this time, the force exerted on the support plate 311 in the direction of the L-shaped sliding plate 111 increases, and the support plate 311 tends to rotate around the connection position between the moving plate 112 and the support plate 311 towards the L-shaped sliding plate 111. However, this tendency is suppressed by the telescopic rod 321, preventing the support plate 311 from colliding with the L-shaped sliding plate 111 or causing other parts of the support plate 311 to impact the blade step, thus ensuring the stable operation of the device.

[0039] like Figure 7 As shown, in some embodiments of the present invention, the heating mechanism 3 further includes at least two rollers 322. At least one roller 322 is provided on the side of the L-shaped sliding plate 111 away from the machine body 13, and at least one roller 322 is provided on the side of the support plate 311 away from the machine body 13. The L-shaped sliding plate 111 contacts the step via the rollers 322 to reduce friction between the L-shaped sliding plate 111 and the step, thereby improving the service life of the L-shaped sliding plate 111. The support plate 311 contacts the step via the rollers 322 to reduce friction between the support plate 311 and the step, thereby improving the service life of the support plate 311. Specifically, the side of the L-shaped sliding plate 111 away from the machine body 13 has two spaced-apart rollers 322. The long plate of the L-shaped sliding plate 111 may also have three, four, five, six, or more than six rollers 322. The support plate 311 has two spaced rollers 322 on the side away from the body 13. The support plate 311 may also have three, four, five, six, or more rollers 322 on the side away from the body 13. Furthermore, the outer wall of the rollers 322 is covered with soft rubber to reduce damage to the blade steps caused by the L-shaped sliding plate 111 and the support plate 311.

[0040] like Figure 6As shown, in some embodiments of the present invention, the body 13 has a second accommodating space 132. The first accommodating space 131 and the second accommodating space 132 are arranged at intervals along the length direction of the body 13. The second accommodating space 132 is close to the rear end of the body 13, and most of the counterweight mechanism 2 is located in the second accommodating space 132. Specifically, the first accommodating space 131 and the second accommodating space 132 are separated by a partition 133. The two springs 122 of the sliding mechanism 1 are respectively connected to the partition 133 and the two springs 122 are arranged at intervals along the width direction of the body 13. One end of the spring 122 is connected to the partition 133, and the other end of the spring 122 is connected to the short plate of the L-shaped sliding plate 111.

[0041] like Figure 5 , Figure 6 , Figure 8 As shown, in some embodiments of the present invention, the device further includes a counterweight mechanism 2, which is movably connected to the body 13. The counterweight mechanism 2 is movably connected to the sliding mechanism 1, and the movement direction of the counterweight mechanism 2 is opposite to that of the sliding mechanism 1. When the sliding mechanism 1 drives the heating mechanism 3 to move from the front end to the rear end of the body 13, the counterweight mechanism 2 moves from the rear end to the front end of the body 13; when the sliding mechanism 1 drives the heating mechanism 3 to move from the rear end to the front end of the body 13, the counterweight mechanism 2 moves from the front end to the rear end of the body 13. By setting a counterweight mechanism 2 with a movement direction opposite to that of the sliding mechanism 1, the center of the device is always kept in the middle position of the body 13, preventing the body 13 from falling off the blades due to changes in its center of gravity.

[0042] In some embodiments of the present invention, the counterweight mechanism 2 includes: a fixed rod 212, two telescopic connecting rods 222 and two counterweight blocks 223. The fixed rod 212 passes through the partition 133. One end of the fixed rod 212 is connected to the short plate of the L-shaped sliding plate 111 of the sliding mechanism 1. The other end of the fixed rod 212 is hinged to the two telescopic connecting rods 222 respectively. The two telescopic connecting rods 222 are rotatably connected to the body 13 and located in the second accommodating space 132. The two telescopic connecting rods 222 rotate in opposite directions. The end of each telescopic connecting rod 222 away from the fixed rod 212 is connected to a counterweight block 223. When the L-shaped sliding plate 111 moves from the front end to the rear end of the body 13, it pushes the fixed rod 212 towards the second receiving space 132. The fixed rod 212 then pushes the two telescopic connecting rods 222, which are hinged to it, to rotate. The two telescopic connecting rods 222 rotate in opposite directions. Under the action of the telescopic connecting rods 222, the counterweight 223 rotates around the pivot 221 of the telescopic connecting rods 222, so that the counterweight 223 moves from the rear end of the body 13 towards the rear end of the body 13. The L-shaped sliding plate 111 moves from the rear end to the front end of the body 13, causing the fixed rod 212 to move towards the first receiving space 131. The fixed rod 212 then drives the two telescopic connecting rods 222, which are hinged to it, to rotate in opposite directions. Under the action of the telescopic connecting rods 222, the counterweight 223 rotates around the pivot 221 of the telescopic connecting rods 222, causing the counterweight 223 to rotate from the front end of the body 13 towards the rear end. Through the cooperation of the fixed rod 212, the two telescopic connecting rods 222, and the two counterweights 223, the center of the device is always kept in the middle position of the body 13, preventing the body 13 from falling off the blades due to changes in its center of gravity.

[0043] Furthermore, the partition 133 is provided with two spaced grooves, which connect the first accommodating space 131 and the second accommodating space 132. The two grooves are provided with two counterweights 223. When the counterweights 223 rotate to the position of the partition 133, the counterweights 223 rotate from the second accommodating space 132 to the first accommodating space 131 or from the first accommodating space 131 to the second accommodating space 132 through the corresponding grooves.

[0044] In some embodiments of the present invention, the counterweight mechanism 2 further includes: a friction block 211 and two friction plates 213. The friction block 211 is sleeved on the fixed rod 212 and located at one end of the fixed rod 212 near the telescopic connecting rod 222. The two friction plates 213 are disposed opposite each other in the first accommodating space 131 of the body 13 and are respectively fixedly connected to the partition plate 133. The two friction plates 213 are spaced apart along the width direction of the body 13 and are arranged in parallel. The friction block 211 cooperates with the two friction plates 213. When the L-shaped sliding plate 111 moves, the L-shaped sliding plate 111 drives the fixed rod 212 to move. The friction block 211 sleeved on the fixed rod 212 moves relative to the two friction plates 213 on both sides. Since the friction between the friction block 211 and the friction plate 213 is relatively large, the friction generated is slightly less than the elastic force of the two springs 122. At this time, the elastic potential energy of the spring 122 is slowly released, and the L-shaped sliding plate 111 moves slowly, thereby reducing the impact. By cooperating with the friction block 211 and the two friction plates 213, the L-shaped slide can be prevented from moving rapidly due to the elastic force released by the spring 122, thus avoiding the L-shaped slide from hitting the side wall of the machine body 13 or the step of the blade, reducing the impact generated by the whole device, protecting the device and the blade, and improving the service life of the device.

[0045] In some embodiments of the present invention, the surface of the track 14 is provided with an adsorption element (not shown in the figure). The track 14 is adsorbed onto the surface of the blade by the adsorption element on its surface, thereby improving the adhesion of the track 14 to the blade surface, preventing the track 14 from falling off the blade surface, and improving the safety of the in-situ non-destructive testing device for turbine blades based on temperature sensors. Specifically, the adsorption element can be a magnet or an adsorption plate. The adsorption force of the adsorption element allows the track 14 to be adsorbed onto the surface of the blade. At the same time, the walking power of the track 14 is greater than the adsorption force of the adsorption element to ensure that the track 14 can move normally.

[0046] The in-situ non-destructive testing device for turbine blades based on a temperature sensor of the present invention has the following beneficial effects:

[0047] (1) The present invention utilizes the fact that when the device moves to the root of the blade, the track 14 continues to move, the pressure on the contact surface between the L-shaped sliding plate 111 and the step increases, thereby pressing the L-shaped sliding plate 111 to move along the slide groove 121. At this time, the infrared heating lamp 312 stops working. After the L-shaped sliding plate 111 moves a certain distance towards the rear end of the machine body, the moving plate 112 rotates to a state parallel to the L-shaped sliding plate 111. The moving plate 112 and the L-shaped sliding plate 111 remain parallel until the track 14 contacts the step. Then the track 14 continues to run and climbs the step. The entire device and the blade form an angle. The detector 16 detects the temperature at the corner between the blade and the step. By using the above components, the problem of the infrared heating lamp 312 mounted on the front side of the mobile small robot moving along the blade surface can be thermally excited at the root of the blade. However, the detector 16 installed on the rear side of the robot is blocked by the overall structure of the detection device, making it difficult to directly target the heating area at the root of the blade to collect temperature signals, which in turn causes the detection data to deviate.

[0048] (2) The present invention utilizes the feature that the L-shaped sliding plate 111 of the above-mentioned device moves along the slide groove 121. When the L-shaped sliding plate 111 moves, it drives the fixed rod 212 to move, thereby driving the friction block 211 to move towards the rear end of the machine body, and driving the connection position of the rotating shaft 221 and the fixed rod 212 to move towards the rear end of the machine body, so that the telescopic connecting rod 222 rotates around the axis of the rotating shaft 221 at a certain angle, and the counterweight 223 shows the feature of moving from left to right. No matter where the L-shaped sliding plate 111 is located, the counterweight 223 will adjust the center of gravity of the entire device to the center position of the device. Through the application of the above components, it effectively prevents the problem that when the L-shaped sliding plate 111 drives the infrared heating lamp 312 to move, the center of gravity of the entire device will move due to the heavy weight of the infrared heating lamp 312, causing one side of the track 14 to lift up, reducing the area of ​​the track 14 adsorbed on the blade surface, and causing the device to fall off the blade.

[0049] (3) The present invention addresses the problem of the L-shaped sliding plate 111 contacting the blade step in the above-mentioned device. When the track 14 moves continuously, the contact point between the L-shaped sliding plate 111 and the blade step also moves upward. Due to the presence of the roller 322 on the L-shaped sliding plate 111, the friction between the L-shaped sliding plate 111 and the blade step changes from sliding friction to rolling friction. Furthermore, the outer wall of the roller 322 is wrapped with soft rubber, reducing the damage of the L-shaped sliding plate 111 to the blade step. When the angle between the device as a whole and the blade changes from large to small, the support plate 311 moves around the moving plate 112 and the support plate 311. The tendency of the connecting position to rotate toward the L-shaped sliding plate 111 is suppressed by the telescopic rod 321. Through the application of the above components, the damage to the blade step caused by the continuous contact between the L-shaped sliding plate 111 and the support plate 311 and the blade step due to the elastic force of the spring 122 is effectively prevented when the track 14 climbs up the blade step. It also prevents the problem of the support plate 311 rotating and causing contact between the L-shaped sliding plate 111 and the support plate 311 when the track 14 climbs down the blade step, and the impact between other parts of the support plate 311 and the blade step.

[0050] (4) This invention utilizes the characteristic of the above-mentioned device spring 122 to reset the L-shaped sliding plate 111. The contact pressure between the L-shaped sliding plate 111 and the blade step continuously increases, thereby driving the L-shaped sliding plate 111 to move towards the rear end of the machine body, causing the fixed rod 212 to move towards the rear end of the machine body. When the L-shaped sliding plate 111 and the support plate 311 are no longer in contact with the blade step, the spring 122 will change from the compressed state to the free state, thereby driving the L-shaped sliding plate 111 to move, driving the fixed rod 212 to move, causing the friction block 211 to move. Since the friction force between the friction block 211 and the friction plate 213 is large, the friction force generated is slightly less than the elastic force of the two springs 122. At this time, the elastic potential energy of the spring 122 is slowly released, and the L-shaped sliding plate 111 moves slowly, thereby reducing the impact. Through the application of the above components, the problem of the L-shaped sliding plate 111 hitting one side of the slide groove 121 when the L-shaped sliding plate 111 moves rapidly under the influence of the elastic force of the spring 122 is effectively prevented, causing the detector 16 to shift and resulting in a decrease in detection accuracy.

[0051] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A non-destructive testing device for turbine blades based on a temperature sensor, characterized in that, include: The machine body comprises a pair of tracks, a detector, a sliding mechanism, and a heating mechanism. The pair of tracks are located on opposite sides of the machine body. The detector is located at the bottom of the machine body. The sliding mechanism is retractable at the front end of the machine body along the direction of travel. The heating mechanism is located at the bottom of the machine body and connected to the sliding mechanism. Along the direction of travel, the heating mechanism is located in front of the detector. The sliding mechanism has an extended state and a retracted state. When the sliding mechanism is in the extended state, part of the sliding mechanism and the heating mechanism are located outside the machine body. When the sliding mechanism is in the retracted state, the sliding mechanism and the heating mechanism are located inside the machine body. The sliding mechanism includes a spring, an L-shaped sliding plate, and a movable plate. The two ends of the spring are respectively connected to the short plate of the L-shaped sliding plate and the machine body. The L-shaped sliding plate is connected to the machine body in a reciprocating manner along the traveling direction of the machine body. The short plate of the L-shaped sliding plate extends towards the bottom of the machine body. The movable plate is rotatably connected to the short plate of the L-shaped sliding plate. The movable plate is rotatably connected to the heating mechanism. When the sliding mechanism is in the extended state, the angle between the long plate of the L-shaped sliding plate and the movable plate is less than 90 degrees. When the sliding mechanism is in the retracted state, the long plate of the L-shaped sliding plate is parallel to the movable plate.

2. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 1, characterized in that, The heating mechanism includes a support plate and an infrared heating lamp. The support plate is rotatably connected to the movable plate. The infrared heating lamp is located on the support plate. When the sliding mechanism is in the retracted state, the long plate of the L-shaped sliding plate is parallel to the support plate.

3. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 2, characterized in that, The heating mechanism further includes a telescopic rod, the two ends of which are respectively hinged to the long plate of the L-shaped sliding plate and the support plate.

4. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 2, characterized in that, The heating mechanism also includes at least two rollers, with at least one roller on the side of the long plate of the L-shaped sliding plate away from the machine body, and at least one roller on the side of the support plate away from the machine body.

5. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 1, characterized in that, The device further includes a counterweight mechanism, which is movably connected to the body and connected to the sliding mechanism. The counterweight mechanism moves in the opposite direction to the sliding mechanism.

6. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 5, characterized in that, The counterweight mechanism includes: a fixed rod, two telescopic links, and two counterweights. One end of the fixed rod is connected to the sliding mechanism, and the other end of the fixed rod is hinged to the two telescopic links respectively. The two telescopic links are rotatably connected to the machine body and rotate in opposite directions. The end of each telescopic link away from the fixed rod is connected to one of the counterweights.

7. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 6, characterized in that, The counterweight mechanism further includes: a friction block and two friction plates. The friction block is sleeved on the fixed rod and located at one end of the fixed rod near the telescopic connecting rod. The two friction plates are disposed opposite to each other on the machine body. The friction block cooperates with the two friction plates.

8. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 7, characterized in that, The body has a first accommodating space and a second accommodating space spaced apart along the length of the body. The first accommodating space has an opening facing the front end of the body. At least part of the sliding mechanism is located in the first accommodating space, and the counterweight mechanism is located in the second accommodating space.

9. The in-situ non-destructive testing device for turbine blades based on a temperature sensor according to claim 1, characterized in that, The surface of the track is equipped with an adsorption element.

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