Ultrasonic detection equipment for high-temperature special equipment component

Abstract

The invention relates to ultrasonic detection equipment for high-temperature special equipment components, and belongs to the technical field of ultrasonic detection of special equipment, a spiral coil for heating is coaxially and vertically mounted in a heat insulation barrel, and the outer side of the top end of the spiral coil is in vertical sliding contact with a sliding guide block; a plurality of telescopic rods are further arranged on the outer side of the heat insulation barrel, the top end of a guide column of each telescopic rod is fixed to a synchronous driving mechanism, clamping arms of the synchronous driving mechanism are vertically installed in a sliding mode relative to the corresponding guide columns, and the clamping arms are arranged in an annular array mode in the axial direction of the spiral coil; in the initial state, the sliding guide block is located on the side wall of the top of the spiral coil, after the telescopic rods retract to the limit, the synchronous driving mechanism starts to drive all the telescopic rods to be close to each other and stretch downwards into the spiral coil, and if the downward moving distance of the sliding guide block is H, the telescopic rods can correspondingly move downwards by H / 2. The test block can be rapidly heated, and special equipment component detection in a high-temperature environment can be accurately simulated.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic testing technology for special equipment, and specifically to an ultrasonic testing device for components of high-temperature special equipment. Background Technology

[0002] Most current ultrasonic testing is conducted at room temperature. However, for some specialized equipment operating in high-temperature environments, the test results for certain components remain unknown. Furthermore, given the significant impact of high temperatures on the stability and penetration of ultrasonic waves, simulating the ambient temperature during testing is crucial. Currently, research on the application of ultrasonic testing technology in high-temperature environments is in a phase of gradual deepening, with domestic scholars actively engaged in related research. However, the application of ultrasonic testing technology to specialized equipment under high-temperature conditions remains a blank area.

[0003] With the updating of a series of special equipment testing standards, such as those for pressure vessels, the difference between the testing system settings and calibration and the actual testing temperature should be controlled within 15℃. This indicates that the standard requires temperature stability of the performance of special components in actual use. However, for the aforementioned reasons, the test results obtained under normal temperature conditions may not be consistent with the conclusions obtained under high temperature conditions. To ensure the accuracy and reliability of testing, and to make the testing more realistic and reliable, it is essential to optimize the ultrasonic testing system, especially to add a high-temperature environment simulation function, to improve testing accuracy and efficiency while meeting temperature control requirements. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an ultrasonic testing device for components of high-temperature special equipment, so as to solve the problems mentioned in the background art.

[0005] This invention is achieved through the following technical solution: An ultrasonic testing device for components in high-temperature special equipment includes a heating device for heating a test block. The heating device includes a spiral coil for eddy current heating, which is coaxially and vertically mounted inside a heat-insulated container. The heat-insulated container is closed at the bottom and open at the top. A sliding guide block is provided on the outer side of the top of the spiral coil, making vertical sliding contact with it. The spiral coil forms a heating area on its inner side after being energized by connecting the bottom end of the metal wire of the spiral coil and the sliding guide block to a power supply circuit. The test block is placed in this heating area and heated. When the sliding guide block slides downwards, the number of turns of the spiral coil connected to the power supply circuit decreases. Several telescopic rods are also provided on the outer side of the heat-insulated container, with the top end of each telescopic rod fixed. There is a guide post, the top of which is fixed to a synchronous drive mechanism. The synchronous drive mechanism includes a number of clamping arms matching the number of telescopic rods. The bottom of each clamping arm has a clamping plate for clamping the middle of the test block. The clamping arms are vertically slidably mounted relative to their corresponding guide post, and the clamping arms are arranged in a circular array around the axial direction of the spiral coil. In the initial state, the sliding guide block is located on the top side wall of the spiral coil. After the telescopic rod is retracted to its limit, the synchronous drive mechanism starts to drive all the telescopic rods to move closer together and extend downward into the spiral coil, so that the clamping plate clamps the test block, which is pre-positioned at the vertical center of the spiral coil, and places it coaxially within the spiral coil. If the sliding guide block moves downward a distance H, the telescopic rod can move downward a distance of H / 2 accordingly.

[0006] Furthermore, the synchronous drive mechanism includes a lower mounting plate that is vertically fixed to the top of the guide post. A planar threaded disk is coaxially rotatably provided inside the lower mounting plate. The planar threaded disk is threadedly engaged with a plurality of threaded blocks arranged in a ring on the mounting plate, so that when the planar threaded disk rotates, all the threaded blocks slide synchronously along a plurality of radial directions of the mounting plate.

[0007] Furthermore, a screw that can rotate on its end face is coaxially provided at one end of the threaded block that protrudes from the lower mounting plate. A cylindrical gear is coaxially fixed at the bottom end of the screw. The cylindrical gear meshes with a rack fixed on the lower mounting plate on one side, so that when the threaded block moves, the screw rotates with the cylindrical gear.

[0008] Furthermore, a threaded sleeve is coaxially threaded onto the screw, and the threaded sleeve is fixedly connected to the clamping arm. The clamping arm extends radially along the lower mounting plate to its outer side, then extends vertically downward, and then extends radially towards the inner side of the lower mounting plate before extending vertically downward again. The clamping plate is fixed at the bottom end of the clamping arm. The portion of the clamping arm extending radially towards the inner side of the lower mounting plate slides through a vertical sliding hole on the column, so that the clamping arm moves downward when the screw rotates.

[0009] Furthermore, the radially extending portion of the inner side of the downward-facing mounting plate of the clamping arm is an elastic telescopic rod, so that after the clamping plate clamps the test block, the planar threaded disc can still rotate, allowing the screw to continue rotating.

[0010] Furthermore, a stud is detachably installed at the center of the bottom of the heat insulation barrel. The top of the stud is used to pre-place the test block, so that the test block is in the middle position of the axial direction inside the spiral coil. When it is necessary to adjust the sliding guide block to slide downward, the stud is screwed out to a position where the top surface is flush with the bottom surface inside the heat insulation barrel.

[0011] Furthermore, a connecting pipe is vertically fixed to the center of the upper surface of the lower mounting plate, and an upper mounting plate is fixed to the top of the connecting pipe. A flat threaded disc is rotatably mounted inside the upper mounting plate. The two flat threaded discs in the two mounting plates are coaxially fixed by a rotating shaft rotatably mounted inside the connecting pipe, and the top of the rotating shaft protrudes outside the upper mounting plate to drive an adjusting motor.

[0012] Furthermore, a limit plate is fixed to the top of the telescopic rod. When the limit plate contacts the top surface of the heat insulation barrel, the telescopic rod retracts to its limit.

[0013] Furthermore, the sliding guide block includes a mounting sleeve threaded onto the lead screw, and a sliding tongue elastically extended and retracted on one side of the mounting sleeve by a pressure-resistant spring, the sliding tongue slidingly contacting the outer wall of the helical coil.

[0014] Furthermore, the sliding guide block also includes a sleeve block, which is slidably sleeved on a metal rod. The metal rod is installed parallel to the lead screw and is vertically fixed to the inner wall of the heat insulation barrel.

[0015] The beneficial effects of this invention are as follows: This ultrasonic testing device for high-temperature special equipment components utilizes electromagnetic eddy current heating of the test block. Compared to traditional heating methods, eddy current heating offers key advantages: internal heating, precise temperature control, and minimal interference, making it highly suitable for testing special equipment components. It rapidly raises the surface temperature and facilitates rapid and uniform heat distribution. It can be paired with a high-precision infrared temperature sensor and a PID control system to monitor the component surface temperature in real time, controlling temperature fluctuations within ±2℃ and accurately reproducing the actual temperature environment under different operating conditions. Existing eddy current coils, through spiral arrangement and segmented design, and with the addition of shielding structures such as copper mesh shielding layers, can effectively reduce the interference of alternating magnetic fields on ultrasonic testing signals, enabling the ultrasonic probe to stably receive defect reflection signals. The heating process does not require direct contact with the component, preventing scratches and contamination of the component surface, and eliminating the need for additional heating media (such as oil or gas), thus avoiding the influence of residual media on the test results. Furthermore, it is not limited by the shape of the component; whether it is a flat plate (such as a flange) or a pipe (such as a nuclear power plant main pipeline), uniform heating can be achieved. Therefore, eddy current heating is highly suitable for ultrasonic testing of special equipment in high-temperature environments.

[0016] Furthermore, the relatively uniform distribution of eddy currents within the magnetic field coverage area avoids the problems of "localized overheating" or "large temperature gradients" that are prone to occur in traditional heating methods, ensuring that all detection parts of the component are under the same temperature conditions and improving the accuracy of the detection results. In addition, electromagnetic eddy current heating does not generate a large amount of harmful gases or dust, reducing pollution.

[0017] In addition to the advantages of eddy current heating mentioned above, the most crucial aspect of this design is its flexibility in adjusting the heating power. Even without employing the existing "segmented design," the heating power can be altered by increasing or decreasing the number of segments in the helical coil. This can be achieved directly by moving the sliding guide block to change the number of turns in the helical coil, thereby changing the power level. In practical use, the sliding guide block can be positioned at the top sidewall by default for the maximum heating power. After installing the test block as needed, the power can be lowered. This is extremely simple, requiring no complex automated electrical control, and is beneficial for simulating and testing components in high-temperature environments. Furthermore, the installation and fixing of the test block are automated, avoiding the inconvenience of high-temperature operation.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the appearance of the present invention; Figure 2 This is a front view of a partially cut-out structure of the present invention; Figure 3 The structural diagram of the present invention is shown when the telescopic rod is retracted to its limit. Figure 4 This is a schematic diagram showing the initial position of the workpiece when the clamping plate is holding it in place. Figure 5 A schematic diagram showing the corresponding movement position of the clamping arm when the sliding guide block moves down by one displacement; Figure 6 This is a schematic diagram of a cross-section above the lower mounting plate; Figure 7 This is a side view of the column; Figure 8 This is a cross-sectional view of the clamping plate at the bottom of the clamping arm; Figure 9 for Figure 7 Top view of the structure shown; Figure 10 This is a schematic diagram of the connection structure between two mounting plates; Figure 11 This is a cross-sectional view of a sliding guide block.

[0020] In the diagram: 1. Insulation barrel; 2. Telescopic rod; 3. Limiting plate; 4. Column; 5. Vertical sliding hole 401; 6. Clamping arm; 7. Lower mounting plate; 8. Threaded block; 9. Cylindrical gear; 10. Rack; 11. Screw; 12. Threaded sleeve; 13. Clamping plate; 14. Sliding guide block; 15. Mounting sleeve; 16. Slip tongue; 17. Pressure-resistant spring; 18. Sleeve block; 19. Helical coil; 20. Metal rod; 21. Lead screw; 22. Connecting pipe; 23. Upper mounting plate; 24. Rotating shaft; 25. Adjusting motor; 26. Flat threaded disc; 27. Stud; 28. Transmission gear. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] Please see Figures 1-2 This invention provides a technical solution: an ultrasonic testing device for high-temperature special equipment components, mainly comprising a heating device for heating test blocks. This heating device includes a spiral coil 14 for eddy current heating. After the spiral coil 14 is energized, the test block placed inside it is heated based on eddy current heating. For example, rotating parts such as pipes, columns, shafts, and rods can be placed inside. Specifically, the spiral coil 14 is coaxially and vertically installed inside a heat-insulating barrel 1. The heat-insulating barrel 1 isolates heat exchange with the outside environment, ensuring that the internal temperature rises quickly enough and reducing heat loss. It can be constructed of ceramic or refractory bricks, and the bottom of the heat-insulating barrel 1 is closed while the top is open, allowing the test block to be placed from the top. In this embodiment, a sliding guide block 13 is provided on the outer side of the top end of the spiral coil 14, making vertical sliding contact with it. The sliding guide block 13 is conductive. The spiral coil 14 connects the sliding guide block 13 and the bottom end of the metal wire of the spiral coil 14 to the power supply circuit, that is, the part of the metal wire between the sliding guide block 13 and the bottom end of the metal wire is connected to the circuit, so as to generate eddy currents and heat up. This results in a heating area being formed on the inner side of the corresponding section of the spiral coil 14 after being energized. This heating area is used for the test block to be placed in and heated quickly and fully. Figures 4-5 When the sliding guide block 13 slides downwards, the number of turns or coils of the spiral coil 14 connected to the power supply circuit decreases, thus reducing the heat generation and lowering the vertical center position of the heating area. Generally, the essence of eddy current heating is to induce workpiece heating by generating an alternating magnetic field through the coil. The coil spacing directly affects the uniformity of the magnetic field distribution, heating efficiency, and the degree of interference with ultrasonic testing. Therefore, since the spacing is usually positively correlated with the wire diameter, the spacing per turn is generally 1.2-2 times the wire diameter to avoid overheating of the coil or uneven magnetic field superposition. Since more turns result in greater density and higher magnetic field strength, but too small a spacing can easily lead to eddy current mutual inductance between coils, increasing losses, for temperatures below 600℃, 5-20 turns of coil are sufficient. Furthermore, the coil winding density can be dynamically adjusted by the spacing. In high-density areas, such as key inspection areas like welds, the coil spacing is minimized; however, for some low-density areas, the spacing can be increased, for example, to 1.5 times the maximum value.

[0025] In the above embodiments, several telescopic rods 2 are also provided on the outside of the heat insulation barrel 1. A guide post is fixed to the top of each telescopic rod 2, and the top of the guide post is fixed to a synchronous drive mechanism. This synchronous drive mechanism includes clamping arms 5 in the same number as the telescopic rods 2. The bottom end of the clamping arms 5 has a clamping plate 12 for clamping the middle of the test block. The clamping plate 12 is an arc-shaped plate. The general structure can be found in [reference needed]. Figures 8-9 Fabricate as shown, or adapt to the specific shape of the test block to fit snugly against the side of the test block for clamping. Also refer to... Figure 7 In this embodiment, the clamping arm 5 is vertically slidably installed relative to its corresponding guide post. Specifically, the clamping arm 5 can slide vertically and horizontally along the guide post. In the design, it is preferable that the clamping arms 5 are arranged in a circular array around the axial direction of the helical coil 14, and in the initial state, such as... Figure 2 The sliding guide block 13 is located on the top side wall of the spiral coil 14. At this time, the spiral coil 14 has the most turns, which is equivalent to the entire spiral coil 14 being fully energized, forming eddy currents, and the heating power is at its maximum. When using it, first... Figure 3 As shown, after the telescopic rod 2 is retracted to its limit, that is, when it moves down to its limit, the synchronous drive mechanism begins to drive all the telescopic rods 2 to move closer together and simultaneously extend downward into the spiral coil 14, as shown. Figure 4 The clamping plate 12 clamps the test block, which is pre-placed at the vertical center of the spiral coil 14. Due to the synchronous closing action of the clamping arms 5 of the annular array, the test block is pushed to a position coaxially placed within the spiral coil 14 to ensure sufficient heating for high-temperature simulation testing. Furthermore, during use, if the sliding guide block 13 moves downward a distance H, the telescopic rod 2 can move downward a corresponding distance H / 2. That is, assuming a reduction in heating power, the sliding guide block 13 can be moved downward, reducing the number of turns in the energized spiral coil 14 and decreasing the heating power to accommodate test blocks of different sizes or operating temperatures. Because the downward movement of the sliding guide block 13 by H causes the center of the energized spiral coil 14 to move downward by H / 2, the test block clamped by the clamping plate 12 should also move downward by H / 2 to ensure the test block remains at the center of heating.

[0026] In this embodiment, as shown in Figure 2, Figure 6 , Figure 10 As shown, this synchronous drive mechanism includes a lower mounting plate 6 vertically fixed to the top of the guide post. A planar threaded disk 21 is coaxially rotatable within this lower mounting plate 6. The planar threaded disk 21 is threadedly engaged with several threaded blocks 7 arranged in a ring on the mounting plate. The bottom end face of each threaded block 7 has a planar thread for meshing with the end thread of the planar threaded disk 21, allowing for transmission. This enables all threaded blocks 7 to synchronously slide along several radial directions of the mounting plate when the planar threaded disk 21 rotates, thus achieving synchronous approach or movement of all clamping arms 5. Figure 6At one end of the threaded block 7 that protrudes from the lower mounting plate 6, a screw 10 that can rotate on its end face is coaxially provided. During manufacturing, the smooth shaft section at the bottom end of the screw 10 is threadedly installed inside the top surface of the threaded block 7. A cylindrical gear 8 is coaxially fixed at the bottom end of the screw 10. This cylindrical gear 8 meshes with a rack 9 fixed on the lower mounting plate 6 on one side, so that when the threaded block 7 moves linearly, the cylindrical gear 8 rotates because it meshes with the fixed rack 9, thereby causing the screw 10 to rotate.

[0027] Based on the above structure, such as Figure 2 , Figure 10 The screw 10 is also coaxially threaded with a threaded sleeve 11. One side of the threaded sleeve 11 is fixedly connected to the clamping arm 5. Specifically, based on the structure of the mounting plate and the threaded block 7, the clamping arm 5 needs to be a special curved structure. Specifically, the clamping arm 5 extends radially along the lower mounting plate 6 to its outer side, then extends vertically downward, then extends radially along the inner side of the lower mounting plate 6, crosses the lower mounting plate 6, and finally extends vertically downward. A clamping plate 12 is fixed at the bottom end of the clamping arm 5. Based on the above design of the screw 10 and the threaded sleeve 11, in order to realize the principle of the screw 16 mechanism, the part of the clamping arm 5 extending radially along the inner side of the lower mounting plate 6 needs to slide through the vertical sliding hole 401 on the column 4 so that when the screw 10 rotates, the clamping arm 5 moves downward, preventing the clamping arm 5 and the threaded sleeve 11 from rotating together as a whole.

[0028] To ensure that the clamping arms 5 can still move downwards after all the clamping plates 12 are tightly attached to the test block, specifically, the radially extending portion of the inner side of the downward-facing mounting plate 6 of the clamping arm 5 is an elastic telescopic rod 2. This allows the flat threaded disc 21 to still rotate after the clamping plates 12 clamp the test block, so that the screw 10 can continue to rotate. Alternatively, a rod connecting the clamping plates 12 can be an elastic telescopic structure, which is vertically fixed to the bottom end of the clamping arm 5, allowing the clamping arm 5 to move downwards as... Figure 5 The position is adjusted to reduce the number of turns of the spiral coil 14, thereby reducing the heating power.

[0029] Furthermore, in the above embodiments, a stud 22 can be detachably installed at the center of the bottom of the heat insulation barrel 1. The stud 22 is designed to be of an adaptive size. The top of the stud 22 is used to pre-place the test block, and the test block is positioned in the middle of the axial direction within the spiral coil 14. That is, the stud 22 is the element for pre-placing the test block. For ease of installation, the top of the stud 22 can have an integrally formed circular plate (not shown in the figure) with a larger diameter, so that the test block can be placed on the circular plate. When the stud is screwed down, the circular plate can be submerged in the inner bottom surface of the heat insulation barrel 1. When it is necessary to adjust the sliding guide block 13 so that the sliding guide block 13 slides downward, the stud 22 is screwed out until the top surface is flush with the inner bottom surface of the heat insulation barrel 1, so as to avoid obstructing the clamping plate 12 from moving the test block down to the center of the adjusted heating area.

[0030] In this embodiment, as Figure 10 A connecting pipe 17 is vertically fixed to the center of the upper surface of the lower mounting plate 6. An upper mounting plate 18 is fixed to the top of the connecting pipe 17. A flat threaded disc 21 and a corresponding threaded block 7 are rotatably mounted inside the upper mounting plate 18. The two ends of the screw 10 are respectively rotatably mounted in two opposing threaded blocks 7. The two flat threaded discs 21 in the two mounting plates are coaxially fixed by a rotating shaft 19 rotatably mounted inside the connecting pipe 17, so that the two flat threaded discs 21 rotate synchronously, driving the screw 10 to move radially along the mounting plate. The top of the rotating shaft 19 protrudes outside the upper mounting plate 18 to drive an adjusting motor 20 for automatic adjustment.

[0031] In this embodiment, as Figures 1-5 A limiting plate 3 is fixed at the top of the telescopic rod 2. When the limiting plate 3 contacts the top surface of the heat insulation barrel 1, such as Figure 3 Telescopic rod 2 retracts to its limit.

[0032] As for the sliding guide block 13, it can be like this: Figure 11 As shown, the specific components include a mounting sleeve 1301 threaded onto the lead screw 16, and a sliding tongue 1302 elastically telescopically mounted on one side of the mounting sleeve 1301 via a pressure-resistant spring 1303. The sliding tongue 1302 slides in contact with the outer wall of the spiral coil 14, allowing it to fully contact the outer side of the spiral coil 14 and preventing jamming during rigid contact. Furthermore, to ensure the sliding guide block 13 remains energized, this embodiment also includes a sleeve block 1304, which is slidably fitted onto a metal rod 15. The metal rod 15 is energized, ensuring the sliding guide block 13 is always energized. The metal rod 15 and the lead screw 16 are installed parallel to each other and vertically fixed to the inner wall of the heat insulation barrel 1.

[0033] In actual testing, based on the different shapes of test blocks and the structural design of different ultrasonic testing equipment, those skilled in the art can install the cable connected to the ultrasonic probe of the corresponding shape in the corresponding high-temperature resistant pipe or other components, and then place the ultrasonic probe inside the spiral coil 14 for testing. This serves both as protection and also provides high-temperature resistance. The specific operation method can be incorporated into this invention by referring to the instruction manual of the corresponding ultrasonic testing equipment.

[0034] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An ultrasonic testing device for components in high-temperature special equipment, comprising a heating device for heating a test block, characterized in that: The heating device includes a spiral coil (14) for eddy current heating. The spiral coil (14) is coaxially and vertically installed inside a heat-insulating barrel (1), which is closed at the bottom and open at the top. A sliding guide block (13) is provided on the outer side of the top of the spiral coil (14) in vertical sliding contact with it. The spiral coil (14) forms a heating area on its inner side after being energized by connecting the bottom end of the metal wire of the spiral coil (14) and the sliding guide block (13) to the power supply circuit. The heating area is used for the test block to be placed and heated. When the sliding guide block (13) slides downward, the number of turns of the spiral coil (14) connected to the power supply circuit decreases. Several telescopic rods (2) are provided on the outside of the heat insulation barrel (1). Each telescopic rod (2) has a guide post fixed at its top end. The top end of the guide post is fixed on a synchronous drive mechanism. The synchronous drive mechanism includes clamping arms (5) in the same number as the telescopic rods (2). The bottom end of the clamping arm (5) has a clamping plate (12) for clamping the middle of the test block. The clamping arm (5) is vertically slidably installed relative to its corresponding guide post. The clamping arms (5) are arranged in a ring array around the axial direction of the spiral coil (14). In the initial state, the sliding guide block (13) is located on the top side wall of the spiral coil (14). After the telescopic rod (2) retracts to its limit, the synchronous drive mechanism starts to drive all the telescopic rods (2) to move closer to each other and extend downward into the spiral coil (14), so that the clamping plate (12) clamps the test block that is pre-placed in the middle of the vertical direction inside the spiral coil (14) and places it coaxially inside the spiral coil (14). If the sliding guide block (13) moves down a distance of H, the telescopic rod (2) can move down a distance of H / 2 accordingly.

2. The ultrasonic testing equipment for high-temperature special equipment components according to claim 1, characterized in that: The synchronous drive mechanism includes a lower mounting plate (6) that is vertically fixed to the top of the guide post. A planar threaded disk (21) is coaxially rotatably provided inside the lower mounting plate (6). The planar threaded disk (21) is threadedly engaged with a plurality of threaded blocks (7) arranged in a ring on the mounting plate, so that when the planar threaded disk (21) rotates, all the threaded blocks (7) slide synchronously along a plurality of radial directions of the mounting plate.

3. The ultrasonic testing equipment for high-temperature special equipment components according to claim 2, characterized in that: The threaded block (7) has a screw (10) that can rotate on its end face, which is coaxially provided at one end exposed on the lower mounting plate (6). A cylindrical gear (8) is coaxially fixed at the bottom end of the screw (10). The cylindrical gear (8) meshes with a rack (9) fixed on the lower mounting plate (6) on one side, so that when the threaded block (7) moves, the screw (10) rotates with the cylindrical gear (8).

4. The ultrasonic testing equipment for high-temperature special equipment components according to claim 3, characterized in that: The screw (10) is also coaxially threaded with a threaded sleeve (11), which is fixedly connected to the clamping arm (5). The clamping arm (5) extends radially along the lower mounting plate (6) to its outer side, then extends vertically downward, and then extends radially downward to the inner side of the lower mounting plate (6) before extending vertically downward. The clamping plate (12) is fixed at the bottom end of the clamping arm (5). The portion of the clamping arm (5) extending radially downward to the inner side of the lower mounting plate (6) slides through the vertical sliding hole (401) on the column (4) so ​​that the clamping arm (5) moves downward when the screw (10) rotates.

5. The ultrasonic testing equipment for high-temperature special equipment components according to claim 4, characterized in that: The portion of the clamping arm (5) extending radially on the inner side of the mounting plate (6) is an elastic telescopic rod (2), so that after the clamping plate (12) clamps the test block, the planar threaded disc (21) can still rotate, so that the screw (10) can continue to rotate.

6. The ultrasonic testing equipment for high-temperature special equipment components according to claim 1, characterized in that: A stud (22) is detachably installed at the center of the bottom of the heat insulation barrel (1). The top of the stud (22) is used to place a test block in advance, so that the test block is in the middle position of the spiral coil (14) in the axial direction. When it is necessary to adjust the sliding guide block (13) to slide downward, the stud (22) is screwed out to the position where the top surface is flush with the bottom surface of the heat insulation barrel (1).

7. The ultrasonic testing equipment for high-temperature special equipment components according to claim 1, characterized in that: A connecting pipe (17) is vertically fixed at the center of the upper surface of the lower mounting plate (6). An upper mounting plate (18) is fixed at the top of the connecting pipe (17). A flat threaded disc (21) is rotatably installed inside the upper mounting plate (18). The two flat threaded discs (21) inside the two mounting plates are coaxially fixed by a rotating shaft (19) rotatably installed inside the connecting pipe (17). The top of the rotating shaft (19) protrudes outside the upper mounting plate (18) to drive an adjusting motor (20).

8. The ultrasonic testing equipment for high-temperature special equipment components according to claim 1, characterized in that: The top end of the telescopic rod (2) is fixed with a limiting plate (3). When the limiting plate (3) contacts the top surface of the heat insulation barrel (1), the telescopic rod (2) retracts to its limit.

9. The ultrasonic testing equipment for high-temperature special equipment components according to claim 1, characterized in that: The sliding guide block (13) includes a mounting sleeve (1301) threadedly engaged with the lead screw (16) and a sliding tongue (1302) elastically telescopically mounted on one side of the mounting sleeve (1301) by a pressure-resistant spring (1303). The sliding tongue (1302) slides in contact with the outer wall of the spiral coil (14).

10. The ultrasonic testing equipment for high-temperature special equipment components according to claim 9, characterized in that: The sliding guide block (13) also includes a sleeve block (1304), which is slidably sleeved on a metal rod (15). The metal rod (15) is installed parallel to the lead screw (16) and is vertically fixed on the inner wall side of the heat insulation barrel (1).

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