Ultrasonic C scanning device with U-shaped structure

Abstract

The invention relates to the technical field of ultrasonic C scanning, and discloses an ultrasonic C scanning device of a U-shaped structure, the ultrasonic C scanning device comprises two nozzles arranged oppositely and corresponding mounting seats, a U-shaped supporting unit is formed by connecting two rigid supporting arms through a flexible connecting pipe, and a pipeline channel is formed in the U-shaped supporting unit; the locking structure comprises a ball head assembly, a column head assembly and a locking assembly. The ball head assembly and the column head assembly each comprise a sliding spring bolt, an inner supporting rod, a connector and a joint arm with a radial lock hole and an axial lock hole. A connector of the ball head assembly can rotate in multiple directions and is fixed to one rigid supporting arm, and a connector of the column head assembly can rotate in one direction and is fixed to the other rigid supporting arm. The locking assembly comprises a locking lead screw with the two ends opposite in rotating direction and two locking nuts, when the locking lead screw is rotated, the inner supporting rod is driven to abut against the locking tongue so as to fix the connector, and the two assemblies can be attached and locked. The three rotating joints are locked through single rotating action, the relative postures of the two nozzles are directly fixed, the operation action is simplified, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasound C-scan technology, and more specifically, to an ultrasound C-scan device with a U-shaped structure. Background Technology

[0002] Ultrasonic C-scan inspection is one of the key technologies for detecting internal defects in materials in the industrial field. Among them, the ultrasonic penetration method uses one probe to emit ultrasonic waves and another probe to receive the signal that penetrates the workpiece under inspection. It has significant advantages for detecting composite materials with large attenuation coefficients (such as aerospace composite components) and can effectively assess defects such as delamination, debonding, and porosity inside the material.

[0003] To meet the needs of automated inspection, a mechanical scanning arm with a dual-nozzle structure is commonly used to achieve through-hole inspection: one nozzle is equipped with an ultrasonic transmitting probe, and the other nozzle is equipped with an ultrasonic receiving probe. The two nozzles are placed on both sides of the workpiece being inspected, and an ultrasonic coupling channel is formed by spraying water jets. This, combined with the movement of the mechanical scanning arm, completes full-area C-scan imaging.

[0004] Existing ultrasonic C-scanning devices suffer from significant efficiency limitations in nozzle attitude locking. Specifically, to ensure the accuracy of the detection signal and image quality, the two probes must maintain precise alignment (i.e., coaxiality of the two nozzles), and the probe spacing must be flexibly adjusted according to the workpiece thickness. Currently, the mainstream approach involves mounting the two nozzles on independent adjustment mechanisms, typically allowing only movement and adjustment in two vertical directions. This structure requires separate positioning and securing of each nozzle to indirectly lock their relative attitude, resulting in low operational efficiency and hindering the overall efficiency of the inspection operation. Summary of the Invention

[0005] The purpose of this invention is to provide a U-shaped ultrasonic C-scanning device to overcome the above-mentioned deficiencies of the prior art.

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

[0007] An ultrasonic C-scanning device with a U-shaped structure includes two nozzles arranged opposite each other, the two nozzles being respectively connected to corresponding mounting bases, and also includes a U-shaped support unit and a locking structure; The U-shaped support unit consists of two hollow rigid support arms connected by a flexible connecting pipe, with each end connected to a corresponding mounting base, and its interior serving as a pipeline channel. The locking structure includes a ball head assembly, a column head assembly, and a locking assembly; both the ball head assembly and the column head assembly include: The articulated arm has a radial locking hole at one end and an axial locking hole at the other end. The locking tongue is slidably positioned within the axial locking hole; An inner strut is inserted into the articulated arm, with one end abutting against the locking tongue and the other end extending into the radial locking hole; The connector is limited by the latch and the cover fixed to the end of the axial lock hole; in the ball head assembly, one end of the connector is fixedly connected to one of the rigid support arms, and the other end cooperates with the latch and the cover to form a multi-directional rotation joint; in the column head assembly, one end of the connector is fixedly connected to another rigid support arm, and the other end cooperates with the latch and the cover to form a unidirectional rotation joint. The locking assembly includes a locking screw with opposite threads at both ends and two locking nuts. Each of the two locking nuts is slidably disposed in a radial locking hole of one of the joint arms and engages with the locking screw. The locking nut and the corresponding inner support rod abut against each other through an inclined surface, so that when the screw is rotated to move the two locking nuts toward each other, the two inner support rods are driven to tighten the locking tongue to fix the connector and make the ball head assembly and the column head assembly fit together and lock.

[0008] Furthermore, in the ball head assembly, the connector has a spherical connecting portion, and the latch and the cover are provided with ball holes that mate with the spherical connecting portion; in the column head assembly, the connector has a circular connecting portion, and the latch and the cover are provided with flat holes that mate with the circular connecting portion, and the axis of the circular connecting portion is perpendicular to the axis of the latch.

[0009] Furthermore, the end of the latch is provided with an eccentric locking hole whose axis is off-center, and the inner support rod abuts against the bottom of the eccentric locking hole.

[0010] Furthermore, the locking assembly also includes a locking knob, one end of the locking screw is provided with a hexagonal head, and the locking knob is sleeved on the locking screw and is provided with a hexagonal hole that mates with the hexagonal head.

[0011] Furthermore, the nozzle and the mounting base are connected by a quick-change structure, which includes a locking disc, a pawl, and a locking pin. The locking pin is fixed to the nozzle, and the locking disc is rotatably connected to the mounting base. One side of the locking disc has a spiral-shaped locking groove with a notch that communicates with the outer peripheral surface, so that the locking pin can be inserted into the locking groove. When the locking disc rotates in one direction, it can press the locking pin tightly. The outer peripheral surface of the locking disc has ratchet teeth, and the pawl is located on one side of the locking disc and connected to the mounting base, so that when the locking pin is pressed tightly, the pawl and ratchet teeth cooperate to restrict the reverse rotation of the locking disc.

[0012] Furthermore, the ratchet covers part of the outer peripheral surface of the lock disc, and the portion of the outer peripheral surface of the lock disc without the ratchet is provided with a limiting block that can abut against both ends of the pawl.

[0013] Furthermore, a rotating shaft is fixed on the mounting base, and the locking disc is sleeved on the rotating shaft; two annular grooves are spaced apart along the axial direction on the rotating shaft, and a spring plunger that can cooperate with the annular groove is provided inside the locking disc; when the spring plunger extends into one of the annular grooves, the ratchet tooth and the pawl cooperate; when the spring plunger extends into the other annular groove, the ratchet tooth and the pawl are misaligned.

[0014] Furthermore, the nozzle is provided with an anti-collision ring at its front end.

[0015] Furthermore, a universal bamboo-joint tube for blowing air is connected to one side of the nozzle.

[0016] Furthermore, the flexible connecting pipe is a corrugated pipe.

[0017] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. In this invention, two nozzles are respectively fixed to both ends of a U-shaped support unit consisting of a rigid support arm and a flexible connecting tube, forming an integral frame. The U-shaped support unit is hollow inside, serving as a channel for pipelines (e.g., pipelines for ultrasonic coupling media). In actual use, the entire assembly is mounted on a mechanical scanning arm via a quick-change disc.

[0018] The ball joint assembly and the stud assembly can rotate relative to each other around the axis of the locking screw, forming a one-way rotary joint; the connector of the ball joint assembly, together with the latch and the cover, forms a multi-way rotary joint; the connector of the stud assembly, together with the latch and the cover, forms a one-way rotary joint. In practical applications, the connectors of the ball joint assembly and the stud assembly are each connected to one of the nozzles. When not locked, the three rotary joints can effectively accommodate the alignment and distance adjustment of the two nozzles.

[0019] After adjustment, rotating the locking screw drives the two locking nuts to move towards each other within the radial locking holes of the joint arms. This action produces two key and synchronous mechanical effects: First, the inclined surfaces between the locking nuts and the inner support rods abut against each other, driving the two inner support rods to tighten the locking tongues. This instantly locks and fixes the multi-directional rotational freedom of the connector in the ball joint assembly and the unidirectional rotational freedom of the connector in the column joint assembly. Second, the opposing movement of the two locking nuts simultaneously pulls the two joint arms closer together, ultimately causing the ball joint assembly and the column joint assembly to fit tightly together, forming a rigid whole. This directly and rigidly locks the relative spatial orientation and distance between the two nozzles. In other words, this invention can lock the three rotating joints in the locking structure with a single rotating locking screw, achieving direct locking of the relative orientation of the two nozzles, simplifying the operation and improving operational efficiency.

[0020] 2. In this invention, the spiral locking groove on the locking disc cooperates with the locking pin on the nozzle. When the locking disc rotates in one direction, the locking pin is continuously pressed by the side wall of the locking groove, thus achieving rapid locking between the nozzle and the mounting base. At the same time, combined with the cooperation between the ratchet teeth on the outer periphery of the locking disc and the pawl on the mounting base, the reverse rotation of the locking disc is automatically restricted in the locked state. This effectively solves the problems of cumbersome disassembly and assembly and long time consumption in the traditional screw connection method, ensuring connection stability and significantly improving the efficiency of nozzle replacement in the testing operation. Attached Figure Description

[0021] Figure 1 This invention provides a schematic diagram of the structure of a U-shaped ultrasonic C-scanning device. Figure 2 A schematic diagram of another U-shaped ultrasonic C-scanning device provided by the present invention; Figure 3 This is a schematic diagram of the locking structure; Figure 4 This is a top view of the locking structure; Figure 5 for Figure 4 AA section view; Figure 6 for Figure 4 BB section view; Figure 7 for Figure 4 CC section view; Figure 8 This is an enlarged schematic diagram of the locking nut. Figure 9 This is a schematic diagram of the structure of the first joint arm; Figure 10 This is a schematic diagram of the connection structure of the first locking tongue, the first inner support rod, and the first connector. Figure 11 This is a schematic diagram of the structure of the first locking tongue; Figure 12 This is a schematic diagram of the structure of the first connector; Figure 13 This is a schematic diagram of the structure of the first cover. Figure 14 This is a schematic diagram of the connection structure of the second locking tongue, the second inner support rod, and the second connector. Figure 15 This is a schematic diagram of the second locking tongue; Figure 16 This is a schematic diagram of the second connector. Figure 17 This is a schematic diagram of the structure of the second cover. Figure 18 A schematic diagram of the structure of a nozzle is provided for the present technology; Figure 19This is a structural diagram of the quick-change structure; Figure 20 This is a schematic diagram of the installation structure of the locking pin and the rotating shaft; Figure 21 This is a schematic diagram of the front structure of the lock disc; Figure 22 This is a schematic diagram of the back structure of the lock disc; Figure 23 This is a schematic diagram of the connection structure between the rotating shaft and the locking disc; Figure 24 This is a schematic diagram of the installation structure of the anti-collision ring and the universal bamboo joint tube; Reference numerals: 1-Nozzle, 101-Main structure, 1011-Nozzle body, 1012-Card holder, 1013-Filter element, 102-Nozzle assembly, 1021-Nozzle head, 1022-Connecting flange, 2-Mounting base, 3-Rigid support arm, 4-Flexible connecting pipe, 5-Ball head assembly, 501-First articulated arm, 5011-Radial locking hole, 5012-Axial locking hole, 502-First locking tongue, 5021-Ball hole, 503-First inner support rod, 504-First cover, 5041-First positioning groove, 505-First connector, 5051-Spherical connection part, 6-Column head assembly, 601-Second articulated arm 602-Second locking tongue, 6021-Flat hole, 603-Second inner support rod, 604-Second cover, 6041-Second positioning groove, 605-Second connector, 6051-Circular connecting part, 7-Locking assembly, 701-Screw rod, 702-Locking nut, 7021-Locking bevel, 703-Locking knob, 8-Locking disc, 801-Locking groove, 8011-Notch, 802-Ratchet, 803-Limiting block, 804-Mounting through hole, 9-Pawl, 10-Locking pin, 11-Rotating shaft, 12-Spring plunger, 13-Pawl seat, 14-Quick change knob, 15-Quick change disc, 16-Anti-collision ring, 17-Universal bamboo tube. Detailed Implementation

[0022] refer to Figure 1 An ultrasonic C-scanning device with a U-shaped structure includes a U-shaped support unit, a locking structure, and two nozzles 1 arranged opposite each other. The two nozzles 1 are respectively connected to corresponding mounting bases 2. The U-shaped support unit is formed by two hollow rigid support arms 3 connected by a flexible connecting tube 4, with each end connected to a corresponding mounting base 2. That is, the two nozzles 1 are respectively fixed to both ends of the U-shaped support unit composed of rigid support arms 3 and flexible connecting tubes 4, forming an integral frame. The U-shaped support unit is hollow inside, serving as a channel for pipelines (such as pipelines for ultrasonic coupling media). In actual use, the whole device is mounted on a mechanical scanning arm (not shown) via a quick-change disc 15.

[0023] refer to Figure 1In this embodiment, both rigid support arms 3 are straight, and the flexible connecting pipe 4 forms a U-shaped structure after being connected to the two rigid support arms 3. (See reference) Figure 2 In other embodiments, the rigid support arm 3 can of course be other shapes. For example, one rigid support arm 3 may be in a "J" shape, and the other rigid support arm 3 may be straight. The flexible connecting pipe 4 is straight after being connected to the two rigid support arms 3. In this embodiment, the flexible connecting pipe 4 is a corrugated pipe. In other embodiments, the flexible connecting pipe 4 can of course be other forms, such as rubber pipes (natural rubber pipes, silicone rubber pipes, neoprene rubber pipes, etc.) or plastic pipes (polyethylene pipes, polyvinyl chloride pipes, polyurethane pipes, etc.).

[0024] refer to Figure 3-8 The locking structure includes a ball joint assembly 5, a column head assembly 6, and a locking assembly 7. Both the ball joint assembly 5 and the column head assembly 6 include a joint arm, a locking tongue, an inner support rod, and a connector. One end of the joint arm has a radial locking hole 5011, and the other end has an axial locking hole 5012. It is easy to understand that the axis of the axial locking hole 5012 coincides with the axis of the joint arm, and the axis of the radial locking hole 5011 is perpendicular to the axis of the axial locking hole 5012. The locking tongue is slidably disposed within the axial locking hole 5012. The inner support rod passes through the joint arm, with one end abutting against the locking tongue and the other end extending into the radial locking hole 5011. The connector is limited by a latch and a cover fixed to the end of the axial lock hole 5012. In the ball joint assembly 5, one end of the connector, together with the latch and the cover, forms a multi-directional rotating joint, meaning the connector of the ball joint assembly 5 can rotate in any direction within the designed angle range. The other end of the connector is fixedly connected to one of the rigid support arms 3. In the column joint assembly 6, the connector, the latch, and the cover form a unidirectional rotating joint, meaning the connector of the column joint assembly 6 can only rotate in one direction. The other end of the connector is fixedly connected to another rigid support arm 3. The connection method between the connector and the rigid support arm 3 is not limited. For example, in this embodiment, a connecting seat (welded, screwed, or clamped, etc.) is connected to the rigid support arm 3, and the connector is then connected to the connecting seat by screws.

[0025] Based on the above, it can be understood that the ball joint assembly 5 and the pin joint assembly 6 can rotate relative to each other around the axis of the locking screw 701, forming a one-way rotary joint; the connector of the ball joint assembly 5 cooperates with the locking tongue and the cover to form a multi-way rotary joint; the connector of the pin joint assembly 6 cooperates with the locking tongue and the cover to form a one-way rotary joint. In practical applications, the connectors of the ball joint assembly 5 and the pin joint assembly 6 are respectively connected to one of the nozzles 1. When the three rotary joints are not locked, they can well adapt to the alignment and distance adjustment of the two nozzles 1.

[0026] The locking assembly 7 includes a locking screw 701 and two locking nuts 702. The threads at both ends of the locking screw 701 are turned in opposite directions. The two locking nuts 702 are each slidably disposed in the radial locking hole 5011 of one of the joint arms and cooperate with the locking screw 701. The locking nut 702 abuts against the end of the inner support rod via an inclined surface. With this design, after the two nozzles 1 are aligned and the distance is adjusted, the action of rotating the locking screw 701 will drive the two locking nuts 702 to move towards each other (i.e., move closer to each other) within the radial locking hole 5011 of the joint arm. This action produces two key and synchronous mechanical effects: First, the inclined surface abutment between the locking nut 702 and the inner support rod drives the two inner support rods to press against the locking tongue, which instantly locks and fixes the multi-directional rotational freedom of the connector in the ball head assembly and the unidirectional rotational freedom of the connector in the column head assembly; Second, the opposite movement of the two locking nuts 702 will simultaneously pull the two joint arms closer together, ultimately making the ball head assembly 5 and the column head assembly 6 fit tightly together to form a rigid whole, thereby directly and rigidly locking the relative spatial posture and distance between the two nozzles 1. In other words, the present invention can lock the three rotating joints in the locking structure by rotating the locking screw 701, thereby directly locking the relative posture of the two nozzles 1, simplifying the operation and improving the operation efficiency.

[0027] For ease of description, the joint arm, locking tongue, inner support rod, cover, and connector in ball head assembly 5 are respectively named first joint arm 501, first locking tongue 502, first inner support rod 503, first cover 504, and first connector 505; the joint arm, locking tongue, inner support rod, cover, and connector in column head assembly 6 are respectively named second joint arm 601, second locking tongue 602, second inner support rod 603, second cover 604, and second connector 605.

[0028] refer to Figure 5 , Figure 6 and Figure 13 In this embodiment, the first cover 504 and the first joint arm 501 are connected by screws, and the first cover 504 is provided with a first positioning groove 5041 that mates with the outer wall of the first joint arm 501. (See reference) Figure 5 , Figure 6 and Figure 17 Similarly, the second cover 604 is connected to the second joint arm 601 by screws, and the second cover 604 is provided with a second positioning groove 6041 that cooperates with the outer wall of the second joint arm 601.

[0029] refer to Figure 5 , Figure 6 as well as Figures 9-13In this embodiment, the first connector 505 achieves multi-directional rotation in the following way: the first connector 505 has a spherical connecting portion 5051, and the first locking tongue 502 and the first cover 504 are provided with ball holes 5021 that mate with the spherical connecting portion 5051. (See reference) Figure 5 , Figure 6 as well as Figures 14-17 In this embodiment, the second connector 605 achieves unidirectional rotation in the following way: the second connector 605 has a circular connecting portion 6051, and the second latch 602 and the second cover 604 are provided with a flat hole 6021 that mates with the circular connecting portion 6051. The axis of the circular connecting portion 6051 is perpendicular to the axis of the latch. It is easy to understand that the two sides of the flat hole 6021 are planes that mate with the two end faces of the circular connecting portion 6051, and the bottom of the flat hole 6021 is an arc-shaped surface that mates with the outer peripheral surface of the circular connecting portion 6051.

[0030] The end of the first locking tongue 502 is provided with a first eccentric locking hole (not marked in the figure, see reference) whose axis is off-center. Figure 10 The first inner support rod 503 abuts against the bottom of the first eccentric locking hole. Correspondingly, the end of the second locking tongue 602 is provided with a second eccentric locking hole (not marked in the figure, see reference) whose axis is off-center. Figure 14 The second inner support rod 603 is positioned such that it abuts against the bottom of the second eccentric locking hole. It is worth noting that this design restricts the rotation of the first and second latches 502 and 602 around their axes, and allows the first and second inner support rods 503 and 603 to better clamp the second latches 602 when tightened. In this embodiment, both the first and second latches 502 and 602 have symmetrical weight-reducing grooves on both sides to reduce their weight.

[0031] refer to Figures 5-8 In this embodiment, the locking nut 702 and the end of the inner support rod are connected by an inclined surface as follows: one end of the locking nut 702 is provided with a locking inclined surface 7021, the end of the first inner support rod 503 is provided with a first limiting inclined surface that abuts against the corresponding locking inclined surface 7021, and the end of the second inner support rod 603 is provided with a second limiting inclined surface that abuts against the corresponding locking inclined surface 7021.

[0032] It is worth noting that during the unlocking process, when the two locking nuts 702 are axially far apart, under the action of the locking inclined surface 7021 and the limiting inclined surface, the locking nuts 702 will not rotate relative to the joint arm when the locking screw is rotated. However, if the two locking nuts 702 are axially far apart (when the locking inclined surface 7021 and the limiting inclined surface are no longer in contact), the locking nuts 702 will rotate relative to the joint arm when the locking screw is rotated, which is inconvenient to operate. To solve this problem, the improvement method in this embodiment is as follows: a rotation-resistant structure (not shown in the figure) is provided between the locking nut 702 and the radial locking hole 5011 to restrict the rotation of the locking nut 702. That is, the rotation-resistant structure restricts the locking nut 702 to slide relative to the joint arm and prevents it from rotating relative to the joint arm. For example, in this embodiment, the rotation-resistant structure can be a D-shaped shaft and a D-shaped hole that cooperate with each other. That is, the locking nut 702 is designed in a D-shape, and the radial locking hole 5011 is also designed in a D-shape accordingly. In other embodiments, the anti-rotation structure can of course be other structures, such as mutual protrusions and grooves between the locking nut 702 and the radial locking hole 5011; or the anti-rotation can be achieved by a connecting key.

[0033] In this embodiment, one end of the locking screw 701 is connected to a locking knob 703, which facilitates the rotation of the locking screw 701 by applying rotational torque to the locking knob 703, making operation more convenient. Alternatively, in this embodiment, the locking knob 703 is connected as follows: one end of the locking screw 701 is provided with a hexagonal head, that is, the locking screw 701 is shaped like a bolt. The locking knob 703 is sleeved on the locking screw 701 and is provided with a hexagonal hole that mates with the hexagonal head. The relative rotation of the locking screw 701 and the locking knob 703 is restricted by the hexagonal hole and the hexagonal head.

[0034] refer to Figures 19-22 In this embodiment, the nozzle 1 and the mounting base 2 are connected by a quick-change structure. The quick-change structure includes a locking disc 8, a pawl 9, and a locking pin 10. The locking pin 10 is fixedly installed on the nozzle 1 (the fixing method is not limited, such as interference fit, bonding, etc.). The locking disc 8 is rotatably connected to the mounting base 2. A locking groove 801 is provided on one side of the locking disc 8. The locking groove 801 is spiral in shape, that is, the trajectory line of the locking groove 801 gradually approaches the center of the locking disc 8. The locking groove 801 is provided with a notch 8011 that connects to the outer peripheral surface.

[0035] In practical applications, the locking discs 8 are symmetrically arranged on both sides of the mounting base 2 to ensure installation stability. During installation, the locking discs 8 are rotated until the notch 8011 is parallel to the axis of the nozzle 1, and the nozzle 1 is placed on the mounting base 2 (while the locking pin 10 is inserted into the locking groove 801). Then, the locking discs 8 are rotated in one direction, and the spiral locking groove 801 gradually presses the locking pin 10 tightly. After the locking pin 10 is pressed tightly, the axial relative position between the nozzle 1 and the mounting base 2 is ensured.

[0036] The outer circumferential surface of the locking disc 8 is provided with ratchet teeth 802, and a pawl 9 is located on one side of the locking disc 8 and connected to the mounting base 2. When the locking pin 10 is pressed, the pawl 9 can cooperate with the ratchet teeth 802 to restrict the reverse rotation of the locking disc 8. Those skilled in the art should understand that the cooperation between the pawl 9 and the ratchet teeth 802 can only restrict the locking disc 8 to the unlocking direction. At the same time, the pawl 9 should be connected to a spring (not shown) to ensure that the locking disc 8 can rotate in the locking direction.

[0037] Based on the above, it can be seen that the present invention uses the spiral locking groove 801 provided on the locking disc 8 to cooperate with the locking post 10 on the nozzle 1. When the locking disc 8 rotates in one direction, the side wall of the locking groove 801 continuously presses the locking post 10, thereby achieving rapid locking of the nozzle 1 and the mounting base 2. At the same time, combined with the cooperation of the ratchet 802 on the outer periphery of the locking disc 8 and the pawl 9 on the mounting base 2, the reverse rotation of the locking disc 8 is automatically restricted in the locked state. This effectively solves the problem of cumbersome disassembly and assembly and long time consumption of the traditional screw connection method, which not only ensures the connection stability, but also significantly improves the efficiency of changing the nozzle 1 in the inspection operation.

[0038] The locking disc 8 is connected to a quick-change knob 14, which allows the locking disc 8 to be rotated by applying rotational torque by squeezing the quick-change knob 14. The locking disc 8 is provided with arrow markings to indicate the locking and unlocking directions, making the operation more convenient for the operator.

[0039] The mounting base 2 has a pawl seat 13 on one side of the locking disc 8. Specifically, the pawl seat 13 is fixed to the mounting base 2 by screws. The side of the pawl seat 13 near the locking disc 8 has a blind mounting hole, and the pawl 9 is located in the blind mounting hole. Those skilled in the art should understand that the toothless side of the pawl 9 is located in the blind mounting hole, and the toothed side extends out of the blind mounting hole under the action of the spring to engage with the ratchet 802.

[0040] In this embodiment, the ratchet 802 covers part of the outer peripheral surface of the lock disc 8. The portion of the outer peripheral surface of the lock disc 8 without the ratchet 802 is provided with a limiting block 803 that abuts against both ends of the pawl 9. It is worth noting that in practical applications, the limiting block 803 can serve as an unlocking limit. Designed so that in the unlocked state, the limiting block 803 abuts against one end of the pawl 9, at which point the locking pin 10 can be removed from the notch 8011 of the lock groove 801. This design makes operation more convenient. In this embodiment, the end of the notch 8011 is provided with a guide slope for guiding purposes.

[0041] In this embodiment, the locking disc 8 is rotated as follows: a rotating shaft 11 is fixedly mounted on the mounting base 2, and the locking disc 8 is sleeved on the rotating shaft 11. In other embodiments, the locking disc 8 can of course be rotated and installed in other ways. As an alternative, the rotating shaft 11 is fixed in the following way in this embodiment: a connecting through hole is provided at the center of the rotating shaft 11, and a threaded hole is provided at the corresponding location of the connecting through hole on the mounting base 2. The connecting through hole and the threaded hole are connected by a screw (not shown in the figure) to achieve the fixed installation of the rotating shaft 11. In other embodiments, the rotating shaft 11 can of course be fixed in other ways.

[0042] refer to Figure 23 Based on the above, in this embodiment, two annular grooves are provided axially spaced on the rotating shaft 11. The locking disc 8 has a spring plunger 12 that engages with the annular grooves. Specifically, the outer circumferential surface of the locking disc 8 has a mounting through hole 804 for installing the spring plunger 12, which is installed within the mounting through hole 804. When the spring plunger 12 extends into one of the annular grooves, the ratchet 802 engages with the pawl 9. When the spring plunger 12 extends into the other annular groove, the ratchet 802 and the pawl 9 are misaligned. It is easy to understand that in practical applications, the locking disc 8 can both rotate around the rotating shaft 11 and move axially along the rotating shaft 11. With the spring plunger 12 engaged in the annular groove, the locking disc 8 will not easily move axially. Under normal use, the ratchet 802 remains engaged with the pawl 9. When unlocking is required, the locking disc 8 is pulled outwards, causing the ratchet 802 and pawl 9 to misalign (while the spring plunger 12 engages in the other annular groove), allowing the locking disc 8 to rotate in the unlocking direction.

[0043] It is worth noting that the specific structure of nozzle 1 is not limited; any structure provided by existing technology can be used, such as the structure disclosed in patent publication number "CN120515606A". Figure 18 The structure consists of a main structure 101 (i.e., nozzle body 1011, card holder 1012 and filter element 1013) and a nozzle assembly 102 (i.e. nozzle head 1021 and connecting flange 1022). The two parts are connected together and then fixed on the mounting base 2. An ultrasonic probe (not shown) is installed inside the mounting base 2.

[0044] In practical applications, the nozzle assembly 102 is often replaced to accommodate workpieces of different materials, shapes, or testing requirements. Based on this, in this embodiment, the main structure 101 and the nozzle assembly 102 are also connected using the aforementioned quick-change structure, facilitating rapid assembly and disassembly of both. It is easy to understand that when the quick-change structure is used to connect the main structure 101 and the nozzle assembly 102, the locking pin 10 is fixed to the nozzle assembly 102, and the locking disc 8 and ratchet 9 are located on the main structure 101.

[0045] refer to Figure 24In this embodiment, the nozzle 1 is provided with an anti-collision ring 16 at its front end to prevent the nozzle 1 from colliding with the workpiece during operation. In this embodiment, one side of the nozzle 1 is connected to a universal bamboo tube 17 for blowing air. Those skilled in the art should understand that in actual applications, air is blown outward into the bamboo tube through an external air supply system (the air supply pipeline is also arranged inside the U-shaped support unit). The two universal bamboo tubes 17 spray against each other, and the airflow on both sides constrains and stabilizes the shape of the jet water column, reduces turbulence and bubble mixing, keeps the water column in a laminar flow state, and makes the ultrasonic wave propagation path stable and the energy attenuation small.

[0046] 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 U-shaped ultrasonic C-scanning device, comprising two nozzles arranged opposite each other, the two nozzles being respectively connected to corresponding mounting bases, characterized in that, It also includes a U-shaped support unit and a locking structure; The U-shaped support unit consists of two hollow rigid support arms connected by a flexible connecting pipe, with each end connected to a corresponding mounting base, and its interior serving as a pipeline channel. The locking structure includes a ball head assembly, a column head assembly, and a locking assembly; both the ball head assembly and the column head assembly include: The articulated arm has a radial locking hole at one end and an axial locking hole at the other end. The locking tongue is slidably positioned within the axial locking hole; An inner strut is inserted into the articulated arm, with one end abutting against the locking tongue and the other end extending into the radial locking hole; The connector is limited by the latch and the cover fixed to the end of the axial lock hole; in the ball head assembly, one end of the connector is fixedly connected to one of the rigid support arms, and the other end cooperates with the latch and the cover to form a multi-directional rotation joint; in the column head assembly, one end of the connector is fixedly connected to another rigid support arm, and the other end cooperates with the latch and the cover to form a unidirectional rotation joint. The locking assembly includes a locking screw with opposite threads at both ends and two locking nuts. Each of the two locking nuts is slidably disposed in a radial locking hole of one of the joint arms and engages with the locking screw. The locking nut and the corresponding inner support rod abut against each other through an inclined surface, so that when the screw is rotated to move the two locking nuts toward each other, the two inner support rods are driven to tighten the locking tongue to fix the connector and make the ball head assembly and the column head assembly fit together and lock.

2. The U-shaped ultrasonic C-scanning device according to claim 1, characterized in that, In the ball head assembly, the connector has a spherical connecting portion, and the latch and the cover are provided with ball holes that mate with the spherical connecting portion; in the column head assembly, the connector has a circular connecting portion, and the latch and the cover are provided with flat holes that mate with the circular connecting portion, and the axis of the circular connecting portion is perpendicular to the axis of the latch.

3. The U-shaped ultrasonic C-scanning device according to claim 1, characterized in that, The end of the latch is provided with an eccentric locking hole whose axis is off-center, and the inner support rod abuts against the bottom of the eccentric locking hole.

4. The U-shaped ultrasonic C-scanning device according to claim 1, characterized in that, The locking assembly also includes a locking knob, one end of the locking screw is provided with a hexagonal head, the locking knob is sleeved on the locking screw and is provided with a hexagonal hole that mates with the hexagonal head.

5. The U-shaped ultrasonic C-scanning device according to any one of claims 1-4, characterized in that, The nozzle and the mounting base are connected by a quick-change structure, which includes a locking disc, a pawl, and a locking pin. The locking pin is fixed to the nozzle, and the locking disc is rotatably connected to the mounting base. One side of the locking disc has a spiral-shaped locking groove with a notch that communicates with the outer peripheral surface, so that the locking pin can be inserted into the locking groove. When the locking disc rotates in one direction, it can press the locking pin tightly. The outer peripheral surface of the locking disc has ratchet teeth, and the pawl is located on one side of the locking disc and connected to the mounting base, so that when the locking pin is pressed tightly, the pawl and ratchet teeth cooperate to restrict the reverse rotation of the locking disc.

6. The U-shaped ultrasonic C-scanning device according to claim 5, characterized in that, The ratchet covers part of the outer peripheral surface of the lock disc, and the portion of the outer peripheral surface of the lock disc without the ratchet is provided with a limiting block that can abut against both ends of the pawl.

7. The U-shaped ultrasonic C-scanning device according to claim 5, characterized in that, A rotating shaft is fixed on the mounting base, and the locking disc is sleeved on the rotating shaft. Two annular grooves are spaced apart along the axial direction on the rotating shaft, and a spring plunger that can cooperate with the annular groove is provided inside the locking disc. When the spring plunger extends into one of the annular grooves, the ratchet tooth and the pawl cooperate. When the spring plunger extends into the other annular groove, the ratchet tooth and the pawl are misaligned.

8. The ultrasonic C-scanning device with a U-shaped structure according to any one of claims 1-4, characterized in that, The nozzle has an anti-collision ring at its front end.

9. The ultrasonic C-scanning device with a U-shaped structure according to any one of claims 1-4, characterized in that, One side of the nozzle is connected to a universal bamboo-joint tube for blowing air.

10. The ultrasonic C-scanning device with a U-shaped structure according to any one of claims 1-4, characterized in that, The flexible connecting pipe is a corrugated pipe.

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