Small support arm type ultrasonic C scanning device for C-shaped part

Abstract

The invention relates to the technical field of ultrasonic C-scanning, and provides a small support arm type ultrasonic C-scanning device for a C-shaped part, which comprises a driving assembly, a small support arm structure, a rotating shaft carrying an ultrasonic probe and a nozzle, a wire harness retaining spring coaxially arranged with the rotating shaft, and a wire harness retaining spring arranged on the small support arm structure, one end of the wire harness retaining spring is fixedly arranged, the other end of the wire harness retaining spring is fixedly connected with the rotating shaft, and a signal wire of the ultrasonic probe is wound on the wire harness retaining spring along a spiral path of the wire harness retaining spring, so that the signal wire of the ultrasonic probe generates compliant space deformation along with torsion of the wire harness retaining spring. According to the invention, a preset low-stress strain path is provided for the signal line by utilizing the spiral structure of the wire harness retaining spring, and concentrated stress which is originally concentrated at the root of the signal line and possibly causes fatigue fracture is dispersed to the length of the whole spring, so that the electrical characteristics of the signal line are thoroughly prevented from being influenced by local excessive bending and repeated distortion.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic C-scan technology, and more specifically, to a small-arm ultrasonic C-scan device for C-shaped components. Background Technology

[0002] Ultrasonic C-scan imaging technology is one of the main methods for assessing the internal quality of parts. Among these methods, the penetration method is a classic and effective inspection technique. Its principle is as follows: An ultrasonic transmitting probe is placed on one side of the component, and a receiving probe is placed at a corresponding position on the other side. The ultrasonic beam emitted by the transmitting probe penetrates the component under inspection and is received by the receiving probe. When the ultrasonic waves propagate inside the component, if they encounter defects such as delamination or separation, the sound waves will be scattered, reflected, or undergo mode conversion, causing the acoustic energy penetrating the component to attenuate. By scanning the entire area and recording and imaging the amplitude changes of the received signal, the distribution of defects inside the component can be visually displayed.

[0003] To meet the demands of automated inspection, water-jet ultrasonic C-scanning devices are widely used. This device uses a mechanical scanning arm to carry the probe, which rotates precisely along the workpiece's surface, utilizing a stable water jet as the ultrasonic coupling medium. However, when dealing with typical C-shaped (or U-shaped) components in the aerospace field (such as the leading edges of aircraft wings and tail fins), some C-shaped components have small openings, and the mechanical scanning arms of conventional ultrasonic C-scanning equipment are relatively large, making it difficult to insert the probe inside the C-shaped component.

[0004] To address these challenges, existing technologies typically employ a small structure (referred to in the industry as a small support arm) attached to a robotic arm, capable of carrying a probe and nozzle, to extend into the C-shaped component for inspection. For example, Chinese patent document CN115856086A utilizes a specially designed small support arm for this purpose. However, because the ultrasonic probe requires rotation, its signal cable twists and bends. Excessive bending of the signal cable directly damages its electrical characteristics, leading to severe signal attenuation, distortion, or even failure. Furthermore, the ultrasonic probe's signal cable requires extremely high precision; commonly used slip rings introduce contact resistance changes and impedance mismatches, making them unsuitable for managing ultrasonic probe signal cables. Therefore, overcoming the contradiction between ultrasonic probe rotation and ultrasonic signal cable bending is a pressing issue in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a small-arm ultrasonic C-scanning device for C-shaped components to resolve the contradiction between the rotation of the ultrasonic probe and the bending of the ultrasonic signal line.

[0006] This invention is achieved through the following technical solution:

[0007] A C-type support arm ultrasonic C-scanning device includes a drive assembly, a support arm structure, and a rotating shaft carrying an ultrasonic probe and a nozzle. The rotating shaft is rotatably mounted on the support arm structure. The drive assembly drives the rotating shaft to rotate. The device also includes a wire harness holding spring arranged coaxially with the rotating shaft, with one end fixedly mounted and the other end fixedly connected to the rotating shaft. The signal line of the ultrasonic probe is wound around the wire harness holding spring along the helical path of the wire harness holding spring, so that the signal line of the ultrasonic probe undergoes compliant spatial deformation following the torsion of the wire harness holding spring.

[0008] Furthermore, one end of the wire harness retaining spring is sleeved on the rotating shaft, and the other end is sleeved on the fixedly installed wire harness retaining plug; both ends of the wire harness retaining spring are provided with straightening portions, and the side walls of the rotating shaft and the wire harness retaining plug are provided with insertion holes that cooperate with the straightening portions.

[0009] Furthermore, the wire harness retaining spring is provided with a wire harness protective cover, which is fixedly connected to the small support arm structure. The wire harness protective cover is provided with a receiving hole, and the wire harness retaining plug is disposed in the receiving hole.

[0010] Furthermore, a wire harness retaining spring is fitted with a wire harness fixing ring at one end of the shaft connection, and a first limiting screw is provided on the side wall of the wire harness fixing ring to prevent the wire harness retaining spring from disengaging from the shaft. The wire harness protective cover is provided with a second limiting screw to prevent the wire harness retaining spring from disengaging from the wire harness retaining plug.

[0011] Furthermore, the small support arm structure includes a support arm and a sealing seat. The rotating shaft is rotatably connected inside the support arm. A sealed annular cavity is provided between the sealing seat and the rotating shaft. The rotating shaft has a coupling medium flow channel connecting the annular cavity and the nozzle inside. The sealing seat has a coupling medium inlet connecting the annular cavity.

[0012] Furthermore, the support arm and the rotating shaft are connected by a bearing; the first end of the outer ring of the bearing is limited by a step on the support arm, and the first end of the inner ring of the bearing is limited by a shoulder on the rotating shaft; the second end of the outer ring of the bearing is limited by a cover, which is connected to the support arm by fasteners, and the second end of the inner ring of the bearing is limited by a limiting assembly, which includes an inner locking nut, an outer locking nut, and a locking screw. The inner locking nut and the outer locking nut are both threaded onto the rotating shaft. One side of the inner locking nut abuts against the second end of the inner ring of the bearing, and the locking screw is connected to the outer locking nut to abut against the other side of the inner locking nut.

[0013] Furthermore, one end of the rotating shaft is provided with a sinking groove, the ultrasonic probe is located at the bottom of the sinking groove, the nozzle is located at the top of the sinking groove and the sinking groove forms a closed space, and the sinking groove is connected to the annular cavity through the coupling medium flow channel.

[0014] Furthermore, the coupling medium flow channel includes an inlet section, a first axial section, a second axial section, and a sectional section. The outer end of the inlet section is connected to the annular cavity. One end of the first axial section penetrates the end face of the rotating shaft, and the middle part of the first axial section is connected to the inner end of the inlet section. One end of the sectional section penetrates the side wall of the rotating shaft, and the middle part of the sectional section is connected to the inner end of the first axial section. One end of the second axial section penetrates the end face of the rotating shaft, and the second axial section is connected to the nozzle and its middle part is connected to the inner end of the sectional section. The outer ends of the first axial section, the second axial section, and the sectional section are all provided with plugs.

[0015] Furthermore, sealing rings are provided at both ends of the annular cavity between the sealing seat and the rotating shaft.

[0016] Furthermore, the drive assembly includes a drive pulley, a driven pulley, a transmission belt, and a geared motor. The geared motor is mounted on the small support arm structure, the drive pulley is connected to the geared motor, the driven pulley is fixed on the rotating shaft, and the transmission belt connects the drive pulley and the driven pulley.

[0017] The technical solution of this invention has at least the following advantages and beneficial effects: This invention uses a coaxial wire harness holding spring between the rotating shaft and the fixed end, and winds the ultrasonic probe signal line along its helical path. When the rotating shaft rotates, each turn of the wire harness holding spring evenly distributes the rotation angle, generating a continuous and controllable torsional deformation. During this process, the signal line wound on it is no longer rigidly bent at a fixed point, but rather, guided by the helical shape of each turn of the wire harness holding spring, it smoothly changes its spatial shape in conjunction with the spring. That is, by utilizing the helical structure of the wire harness holding spring, a preset, low-stress strain path is provided for the signal line, distributing the concentrated stress that might otherwise cause fatigue fracture at the root of the signal line to the entire length of the spring. This completely avoids damage to the internal conductor, insulation layer destruction, or signal attenuation caused by excessive local bending or repeated twisting of the signal line. It ensures the detection requirements for free probe rotation while avoiding the contact resistance changes and impedance mismatch problems introduced by traditional conductive slip rings, significantly improving the stability of signal transmission and detection accuracy. It is particularly suitable for automated ultrasonic C-scan detection scenarios inside C-shaped components with limited space. Attached Figure Description

[0018] Figure 1 This invention provides a schematic diagram of the structure of a small-arm ultrasonic C-scanning device for C-type components; Figure 2 A cross-sectional view of a small-arm ultrasonic C-scanning device for C-type components provided by the present invention; Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 for Figure 3Enlarged view at point B in the middle; Figure 5 A magnified schematic diagram of the spring structure for holding the wire harness; Figure 6 This is a schematic diagram of the rotating shaft. Figure 7 Schematic diagram of the wire harness retainer Figure 1 ; Figure 8 Schematic diagram of the wire harness retainer Figure 2 ; Reference numerals: 1-Shaft, 101-Coupled medium flow channel, 1011-Inlet section, 1012-First axial section, 1013-Second axial section, 1014-Cut-off section, 102-Sink, 103-Wire passage, 2-Nozzle, 3-Ultrasonic probe, 4-Wire harness protective cover, 401-Accommodation hole, 402-Wire harness inlet hole, 403-Belt clearance groove, 5-Wire harness retaining ring, 6-Wire harness retaining plug, 7-First limiting screw, 8-Second limiting screw 9-Support arm, 10-Sealing seat, 1001-Coupling medium inlet, 11-Annular cavity, 12-Bearing, 13-Baffle, 14-Limiting assembly, 1401-Inner locking nut, 1402-Outer locking nut, 1403-Locking screw, 15-Sealing ring, 16-Drive assembly, 1601-Drive pulley, 1602-Driven pulley, 1603-Gear motor, 17-Wire harness retaining spring, 1701-Straightening section, 18-Quick change disc. Detailed Implementation

[0019] refer to Figures 1-3 A C-shaped support arm ultrasonic C-scanning device includes a wire harness holding spring 17, a drive assembly 16, a support arm structure, and a rotating shaft 1 carrying an ultrasonic probe 3 and a nozzle 2. The rotating shaft 1 is rotatably mounted on the support arm structure. The drive assembly 16 is used to drive the rotating shaft 1 to rotate. In practical applications, a quick-change plate 18 can be connected to the bottom of the support arm structure. The quick-change plate 18 can be docked and installed on a robotic arm (not shown) so that the robotic arm can carry the support arm structure. The drive assembly 16 can drive the rotating shaft 1 (and its carried ultrasonic probe 3 and nozzle 2) to deflect ±90° along the curvature of the C-shaped component. In this embodiment, the drive scheme of the drive assembly 16 is as follows: the drive assembly 16 includes a driving pulley 1601, a driven pulley 1602, a transmission belt (not shown), and a geared motor 1603. The geared motor 1603 is mounted on the small support structure. The driving pulley 1601 is connected to the geared motor 1603. The driven pulley 1602 is fixed on the rotating shaft 1. The transmission belt connects the driving pulley 1601 and the driven pulley 1602. In other embodiments, the drive assembly 16 can of course adopt other drive schemes, such as using a motor to output power and drive the rotating shaft 1 to rotate through a planetary reducer.

[0020] The wire harness retaining spring 17 is arranged coaxially with the rotating shaft 1, with one end fixedly mounted and the other end fixedly connected to the rotating shaft 1. Specifically, in this embodiment, the wire harness retaining spring 17 is installed as follows: one end of the wire harness retaining spring 17 is sleeved on the rotating shaft 1, and the other end is sleeved on the fixedly mounted wire harness retaining plug 6; both ends of the wire harness retaining spring 17 are provided with straightening portions 1701 (see reference). Figure 5 The side walls of the rotating shaft 1 and the wire harness retaining plug 6 are provided with insertion holes that mate with the straightening part 1701. It is worth noting that the straightening part 1701 mates with the insertion holes to form a simple and efficient anti-torsion connection structure. A small section of the end of the wire harness retaining spring 17 is straightened and inserted into the insertion hole, using shear force to transmit torque and prevent relative sliding between the wire harness retaining spring 17 and the connecting parts (i.e., the rotating shaft 1 and the wire harness retaining plug 6) during rotation. In other embodiments, the wire harness retaining spring 17 can of course be installed and fixed in other ways, such as by welding or bonding it to the connecting parts.

[0021] The signal line (not shown) of the ultrasonic probe 3 is wound around the wire harness retaining spring 17 along its helical path, allowing the signal line of the ultrasonic probe 3 to undergo compliant spatial deformation following the torsion of the wire harness retaining spring 17. When the shaft 1 rotates, each turn of the wire harness retaining spring 17 evenly distributes the rotation angle, producing a continuous and controllable torsional deformation. During this process, the signal line wound around it is no longer rigidly bent at a fixed point, but rather, guided by the helix of the wire harness retaining spring 17, smoothly changes its spatial shape in tandem with the spring. In other words, the helical structure of the wire harness retaining spring 17 provides a preset, low-stress strain path for the signal line, distributing the concentrated stress that could cause fatigue fracture at the root of the signal line to the entire length of the wire harness retaining spring 17. This completely avoids damage to the internal conductor, insulation layer, or signal attenuation caused by excessive local bending or repeated twisting of the signal line. It not only ensures the detection requirement of free probe rotation, but also avoids the contact resistance changes and impedance mismatch problems introduced by traditional conductive slip rings, significantly improving the stability of signal transmission and detection accuracy. It is particularly suitable for automated ultrasonic C-scan detection scenarios inside C-shaped parts with limited space.

[0022] It should be understood that the wire diameter of the wire harness retaining spring 17 should be much larger than the minimum bending radius of the signal line (i.e., the minimum radius to avoid bending damage to the signal line). For example, the wire diameter of the wire harness retaining spring 17 should be 5-10 times larger than the minimum bending radius of the signal line to ensure that the signal line is in a safe bending state. It is easy to understand that, with the wire harness retaining spring 17 sleeved on the rotating shaft 1 and the wire harness retaining plug 6, the signal line of the ultrasonic probe 3 is wound around the middle part of the wire harness retaining spring 17, that is, the parts of the wire harness retaining spring 17 that contact the rotating shaft 1 and the wire harness retaining plug 6 are not wrapped around the signal line of the ultrasonic probe 3. Furthermore, those skilled in the art should understand that the rotating shaft 1 should have a wire passage 103 (see reference). Figure 6 ).

[0023] The wire harness retaining spring 17 is externally provided with a wire harness protective cover 4. It is easy to understand that the wire harness protective cover 4 is provided with a belt avoidance groove 403 to avoid the drive belt (reference). Figure 8 The wire harness protective cover 4 is fixedly connected to the small support arm structure. The wire harness protective cover 4 has a receiving hole 401, and the wire harness retaining plug 6 is disposed in the receiving hole 401. It should be understood that in actual applications, the wire harness protective cover 4 has a wire harness inlet hole 402 (see reference). Figure 7 The signal line of the ultrasonic probe 3 is introduced into the wire harness protective cover 4 through the wire harness inlet hole 402. Based on this, a wire harness fixing ring 5 is fitted onto one end of the rotating shaft 1 where the wire harness retaining spring 17 is connected. The side wall of the wire harness fixing ring 5 is provided with a first limiting screw 7 to prevent the wire harness retaining spring 17 from disengaging from the rotating shaft 1. The wire harness protective cover 4 is provided with a second limiting screw 8 to prevent the wire harness retaining spring 17 from disengaging from the wire harness retaining plug 6. It is worth noting that the first limiting screw 7 and the second limiting screw 8 are tightened radially to prevent the wire harness retaining spring 17 from slipping axially. Together with the structure of the straightening part 1701 and the insertion hole, this ensures a reliable installation of the wire harness retaining spring 17. Furthermore, in this embodiment, the second limiting screw 8 also acts as a fixing screw for the wire harness retaining plug 6; that is, the second limiting screw 8 presses against the wire harness retaining plug 6, fixing the wire harness retaining plug 6 relative to the wire harness protective cover 4. Similarly, the first limiting screw 7 can also fix the wire harness fixing ring 5 relative to the rotating shaft 1 by pressing against it.

[0024] The small support arm structure includes a support arm 9 and a sealing seat 10, which are fastened together by fasteners (e.g., screws). The aforementioned wire harness protective cover 4 is fixedly connected to the sealing seat 10, preferably by screws. A rotating shaft 1 is rotatably connected inside the support arm 9. A sealed annular cavity 11 is provided between the sealing seat 10 and the rotating shaft 1. Specifically, sealing rings 15 are provided at both ends of the annular cavity 11 to ensure its sealing and prevent leakage of the coupling medium from the rotating joint gap. The rotating shaft 1 has a coupling medium flow channel 101 connecting the annular cavity 11 and the nozzle 2 inside, and the sealing seat 10 has a coupling medium inlet 1001 connecting the annular cavity 11. In practical applications, the coupling medium inlet 1001 on the sealing seat 10 is connected to an external liquid supply system. After the coupling medium (e.g., water) enters the annular cavity 11, it flows through the coupling medium flow channel 101 inside the rotating shaft 1 to the nozzle 2, and is finally ejected from the nozzle 2.

[0025] In this embodiment, the specific installation structure of the ultrasonic probe 3 and the nozzle 2 is as follows: a groove 102 is provided at one end of the rotating shaft 1, the ultrasonic probe 3 is located at the bottom of the groove 102, and the nozzle 2 is located at the top of the groove 102, forming a closed space. The groove 102 is connected to the annular cavity 11 through the coupling medium flow channel 101. Those skilled in the art should understand that the ultrasonic probe 3 should extend into the groove 102 to ensure that the coupling medium can completely wet the surface of the ultrasonic probe 3.

[0026] refer to Figure 6 The coupling medium flow channel 101 includes an inlet section 1011, a first axial section 1012, a second axial section 1013, and a sectional section 1014. The outer end of the inlet section 1011 is connected to the annular cavity 11. One end of the first axial section 1012 passes through the end face of the rotating shaft 1, and the middle part of the first axial section 1012 is connected to the inner end of the inlet section 1011. One end of the sectional section 1014 passes through the side wall of the rotating shaft 1, and the middle part of the sectional section 1014 is connected to the inner end of the first axial section 1012. One end of the second axial section 1013 passes through the end face of the rotating shaft 1, and the second axial section 1013 is connected to the nozzle 2 and its middle part is connected to the inner end of the sectional section 1014. The outer ends of the first axial section 1012, the second axial section 1013, and the sectional section 1014 are all provided with plugs. The coupling medium flow channel 101 inside the rotating shaft 1 is formed by multi-stage drilling and plugging. The plugs are used to seal the ends of each process hole to ensure the sealing of the flow channel.

[0027] refer to Figure 4The support arm 9 is connected to the rotating shaft 1 via bearings 12. In practical applications, multiple bearings 12 can be arranged along the axial direction, such as four bearings 12 in this embodiment. Specifically, the bearings 12 are installed as follows: the first end of the outer ring of the bearing 12 is limited by a step on the support arm 9, and the second end of the outer ring of the bearing 12 is limited by a cover 13. The cover 13 is connected to the support arm 9 by fasteners (e.g., screws), that is, the axial fixation of the outer ring of the bearing 12 is achieved by the step on the support arm 9 and the cover 13. The first end of the inner ring of bearing 12 is limited by a shoulder on the rotating shaft 1, and the second end of the inner ring of bearing 12 is limited by a limiting assembly 14. The limiting assembly 14 includes an inner locking nut 1401, an outer locking nut 1402, and a locking screw 1403. The inner locking nut 1401 and the outer locking nut 1402 are both threadedly connected to the rotating shaft 1. One side of the inner locking nut 1401 abuts against the second end of the inner ring of bearing 12, and the locking screw 1403 is connected to the outer locking nut 1402 to abut against the other side of the inner locking nut 1401.

[0028] It is worth noting that the diameter of the rotating shaft 1 is relatively small, typically around 10mm, while the maximum diameter of the inner locking nut 1401 and outer locking nut 1402 is around 30mm. Standard nuts cannot be used, and due to their small size, there are no tools available to tighten the inner locking nut 1401 and outer locking nut 1402 in practical applications, making it difficult to prevent loosening. In this embodiment, the aforementioned limiting component 14 does not require the inner locking nut 1401 and outer locking nut 1402 to be tightened very much. In actual operation, it is only necessary to manually turn the inner locking nut 1401 to make it fit against the inner ring of the bearing 12, then manually turn the outer locking nut 1402 to fit against the inner locking nut 1401, and finally tighten the locking screw 1403 with a wrench. The locking screw 1403 then tightens the inner locking nut 1401, achieving the purpose of preventing loosening.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A C-shaped support arm type ultrasonic C-scanning device, comprising a drive assembly, a support arm structure, and a rotating shaft carrying an ultrasonic probe and a nozzle, wherein the rotating shaft is rotatably mounted on the support arm structure, and the drive assembly is used to drive the rotating shaft to rotate, characterized in that, It also includes a wire harness holding spring arranged coaxially with the rotating shaft, one end of which is fixedly set and the other end is fixedly connected to the rotating shaft. The signal line of the ultrasonic probe is wound around the wire harness holding spring along the spiral path of the wire harness holding spring so that the signal line of the ultrasonic probe undergoes compliant spatial deformation as it follows the torsion of the wire harness holding spring.

2. The small-arm ultrasonic C-scanning device for C-type components according to claim 1, characterized in that, One end of the wire harness retaining spring is sleeved on the rotating shaft, and the other end is sleeved on the fixedly installed wire harness retaining plug; both ends of the wire harness retaining spring are provided with straightening parts, and the side walls of the rotating shaft and the wire harness retaining plug are provided with insertion holes that cooperate with the straightening parts.

3. The small-arm ultrasonic C-scanning device for C-type components according to claim 2, characterized in that, The wire harness retaining spring is provided with a wire harness protective cover, which is fixedly connected to the small support arm structure. The wire harness protective cover is provided with a receiving hole, and the wire harness retaining plug is disposed in the receiving hole.

4. The small-arm ultrasonic C-scanning device for C-type components according to claim 3, characterized in that, One end of the rotating shaft connecting the wire harness retaining spring is fitted with a wire harness fixing ring. The side wall of the wire harness fixing ring is provided with a first limiting screw to prevent the wire harness retaining spring from disengaging from the rotating shaft. The wire harness protective cover is provided with a second limiting screw to prevent the wire harness retaining spring from disengaging from the wire harness retaining plug.

5. The small-arm ultrasonic C-scanning device for C-type components according to claim 1, characterized in that, The small support arm structure includes a support arm and a sealing seat. The rotating shaft is rotatably connected inside the support arm. A sealed annular cavity is provided between the sealing seat and the rotating shaft. The rotating shaft has a coupling medium flow channel connecting the annular cavity and the nozzle. The sealing seat has a coupling medium inlet connecting the annular cavity.

6. The small-arm ultrasonic C-scanning device for C-type components according to claim 5, characterized in that, The support arm and the rotating shaft are connected by a bearing; the first end of the outer ring of the bearing is limited by a step on the support arm, and the first end of the inner ring of the bearing is limited by a shoulder on the rotating shaft; the second end of the outer ring of the bearing is limited by a cover, which is connected to the support arm by fasteners, and the second end of the inner ring of the bearing is limited by a limiting assembly, which includes an inner locking nut, an outer locking nut, and a locking screw. The inner locking nut and the outer locking nut are both threaded onto the rotating shaft. One side of the inner locking nut abuts against the second end of the inner ring of the bearing, and the locking screw is connected to the outer locking nut to abut against the other side of the inner locking nut.

7. The small-arm ultrasonic C-scanning device for C-type components according to claim 5, characterized in that, One end of the rotating shaft is provided with a sinking groove, the ultrasonic probe is located at the bottom of the sinking groove, the nozzle is located at the top of the sinking groove and the sinking groove forms a closed space, and the sinking groove is connected to the annular cavity through the coupling medium flow channel.

8. The small-arm ultrasonic C-scanning device for C-type components according to claim 5, characterized in that, The coupling medium flow channel includes an inlet section, a first axial section, a second axial section, and a sectional section. The outer end of the inlet section is connected to the annular cavity. One end of the first axial section penetrates the end face of the rotating shaft, and the middle part of the first axial section is connected to the inner end of the inlet section. One end of the sectional section penetrates the side wall of the rotating shaft, and the middle part of the sectional section is connected to the inner end of the first axial section. One end of the second axial section penetrates the end face of the rotating shaft, and the second axial section is connected to the nozzle and the middle part is connected to the inner end of the sectional section. The outer ends of the first axial section, the second axial section, and the sectional section are all provided with plugs.

9. The small-arm ultrasonic C-scanning device for C-type components according to claim 5, characterized in that, A sealing ring is provided at both ends of the annular cavity between the sealing seat and the rotating shaft.

10. The small-arm ultrasonic C-scanning device for C-type components according to any one of claims 1-9, characterized in that, The drive assembly includes a drive pulley, a driven pulley, a transmission belt, and a geared motor. The geared motor is mounted on the small support arm structure. The drive pulley is connected to the geared motor. The driven pulley is fixed on the rotating shaft. The transmission belt connects the drive pulley and the driven pulley.

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