A power-assisted mechanical device for inspecting hollow vehicle axles

Abstract

The application discloses a power-assisted mechanical device for hollow axle flaw detection and relates to the technical field of hollow axle ultrasonic flaw detection, which comprises a moving table, a lifting rod is installed on the moving table, an ultrasonic probe is hung on the lifting rod, a power-assisted assembly is arranged on the lifting rod, the power-assisted assembly is used for assisting the ultrasonic probe in moving, the power-assisted assembly comprises a top rotating shaft and a side rotating shaft, the top rotating shaft is fixedly connected to the bottom surface of the top end of the lifting rod, and the bottom of the top rotating shaft is provided with the side rotating shaft; through the operation of the power-assisted assembly, a tension structure at the four corners and the middle part of the ultrasonic probe is designed, always providing upward tension, although the ultrasonic probe cannot be pulled upward, the weight of the ultrasonic probe is greatly offset, the ultrasonic probe can share gravity, and the user does not need to bear the whole weight when moving the ultrasonic probe, so that the problems of heavy hand feeling and laborious operation are solved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic flaw detection technology for hollow axles, specifically to an auxiliary mechanical device for flaw detection of hollow axles. Background Technology

[0002] The mobile ultrasonic flaw detection system for hollow axles of high-speed trains is a type of non-destructive testing equipment designed for flexible operation at high-speed train maintenance sites. It typically uses ultrasonic technology as its core, integrated onto a movable support platform, and utilizes a assisted robotic arm to control the movement of the ultrasonic probe, such as its advancement and rotation. This system performs non-destructive testing on hollow axles using ultrasonic probes.

[0003] However, the existing ultrasonic flaw detection system for hollow shafts of mobile EMU trains still has the following prominent problems in actual use:

[0004] Currently, most equipment uses rigid rods or simple suspension structures to support ultrasonic probes. Due to the probe's significant weight, users must overcome its weight to push and pull it during movement, resulting in a heavy feel and strenuous operation. When performing precise alignment, such as when aiming at a specific detection area on the inner wall of an axle, it is difficult to achieve minute and stable position adjustments, easily leading to wobbling or overshoot, affecting detection accuracy.

[0005] Furthermore, in traditional suspension methods, once the ultrasonic probe is moved to the target inspection position, it is prone to displacement due to its own weight or slight external disturbances if there is no dedicated locking mechanism for fixation. Maintaining its position is particularly difficult when inspecting at an angle or horizontal position. This not only requires the operator to hold the probe for extended periods but may also necessitate assistance from others, significantly impacting the inspection efficiency and single-person operability of ultrasonic flaw detection for hollow axles.

[0006] Therefore, an auxiliary mechanical device for flaw detection of hollow axles is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide an auxiliary mechanical device for flaw detection of hollow axles, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an assistive mechanical device for flaw detection of hollow axles, comprising a movable platform, a lifting rod mounted on the movable platform, an ultrasonic probe suspended on the lifting rod, an assistive component provided on the lifting rod, the assistive component being used to assist the movement of the ultrasonic probe, the assistive component including a top rotating shaft and a side rotating shaft, the top rotating shaft being fixedly connected to the lower surface of the top end of the lifting rod, the side rotating shaft being provided at the bottom of the top rotating shaft, the top rotating shaft and the side rotating shaft being used to provide the ultrasonic probe with rotational freedom, a telescopic rod being fixedly connected to the side rotating shaft, the telescopic rod being used to provide the ultrasonic probe with horizontal movement freedom, a connecting block being rotatably connected to the telescopic shaft end of the telescopic rod, the connecting block being detachably connected to the top surface of the ultrasonic probe, the connecting block being located at the center of the top of the ultrasonic probe, and a connecting rope being provided at each of the four corners of the side wall of the ultrasonic probe, the connecting rope being used to provide the ultrasonic probe with an upward pulling force.

[0009] Furthermore, the assistive component also includes a top plate, which is rotatably connected to the bottom end of the top rotating shaft. A fixing block is fixedly connected to the lower surface of the top plate. The side rotating shaft is rotatably connected to the side wall of the fixing block. The telescopic rod includes a fixed shaft and a telescopic shaft. A spring is installed inside the telescopic rod. The two ends of the spring are fixedly connected to the fixed shaft and the telescopic shaft of the telescopic rod, respectively. A top groove is opened on the top plate. A connecting rod is slidably connected in the top groove. An insert rod is fixedly connected to each of the top and bottom ends of the connecting rod. An electric push rod is fixedly connected to the top surface of the top plate. The electric push rod is divided into a fixed shaft and a telescopic shaft. The telescopic shaft end of the electric push rod is fixedly connected to the insert rod located at the top. Four universal rotating blocks are fixedly connected in a rectangular array on the bottom surface of the top plate. A universal rotating shaft is rotatably connected to the bottom of each of the four universal rotating blocks. Four connecting ropes are fixedly connected to the bottom ends of the four universal rotating shafts, respectively.

[0010] Furthermore, the assistive component also includes four connectors, which are fixedly connected to four connecting ropes. Four guide slots are fixedly connected in a rectangular array on the side wall of the ultrasonic probe. Four hollow shafts are rotatably connected in a rectangular array on the side wall of the ultrasonic probe. A ratchet is fixedly connected to the end of each of the four hollow shafts away from the ultrasonic probe. A torsion spring is installed inside each of the four hollow shafts. The two ends of the torsion spring are fixedly connected to the ultrasonic probe and the ratchet, respectively. Four side slots are formed in a rectangular array on the side wall of the ultrasonic probe. A connecting frame is slidably connected in the four side slots. Four pawls are fixedly connected in a rectangular array on the connecting frame. Four base blocks are fixedly connected in a rectangular array on the side wall of the ultrasonic probe. A spring II is fixedly connected to the top surface of each of the four base blocks. The ends of the four spring IIs away from the base blocks are fixedly connected to the lower surface of the connecting frame.

[0011] Furthermore, the sidewalls of both the top rotating shaft and the side rotating shaft are made of toothed surfaces, and the side of the two insert rods away from the connecting rod is also made of toothed surfaces. The toothed surfaces of the two insert rods are respectively engaged with the toothed surfaces of the top rotating shaft and the side rotating shaft.

[0012] Furthermore, the connecting block is detachably connected to the ultrasonic probe via bolts.

[0013] Furthermore, the ends of the four connecting ropes furthest from their respective universal joints are fixedly connected to a hollow joint, and the connecting ropes are wound around the hollow joints.

[0014] Furthermore, the connector is divided into two threaded parts that separate the connecting rope into two sections, one of which is connected to the universal joint shaft and the other of which is connected to the hollow joint shaft.

[0015] Furthermore, the four connecting ropes slide within a corresponding guide groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] Existing equipment relies on rigid suspension rods to support the ultrasonic probe, requiring users to completely overcome the weight of the ultrasonic probe itself when pushing or pulling.

[0018] By utilizing the assistive components, a tension structure is designed at the four corners and the center of the ultrasonic probe to provide an upward pulling force. Although it cannot pull the ultrasonic probe upward, it significantly offsets the weight of the ultrasonic probe and shares the weight of the ultrasonic probe. When the user moves the ultrasonic probe, they no longer need to bear the full weight of the probe, thus solving the problems of heavy feel and difficult operation.

[0019] Existing equipment has difficulty achieving minute and smooth adjustments when aligning with the flaw detection position of hollow axles.

[0020] With the operation of the assist component, the connecting rope remains taut and under tension, preventing the ultrasonic probe from wobbling. At the same time, the telescopic rod can flexibly extend and retract with the movement of the ultrasonic probe, and the top and side rotating shafts can rotate synchronously. The coordination of extension and rotation makes the posture of the ultrasonic probe more controllable when it moves, and users can easily make slight position adjustments.

[0021] Existing equipment is prone to displacement due to its own weight or slight disturbances when the ultrasonic probe is inserted into a hollow axle for ultrasonic flaw detection.

[0022] With the operation of the assist component, the synchronous locking structure of the top and side rotating shafts works in conjunction with the four connecting ropes. After the ultrasonic probe moves to the target flaw detection position, the top and side rotating shafts are locked. In addition, the tension of the connecting ropes can firmly fix the position of the ultrasonic probe, preventing the ultrasonic probe from shifting during flaw detection. Furthermore, the user does not need to hold the ultrasonic probe for a long time, nor does it require assistance from others, thus improving convenience.

[0023] With the operation of the assist component, the spring can assist the telescopic rod to reset the ultrasonic probe, and the tautness of the four connecting ropes can help the ultrasonic probe quickly return to its initial position. In addition, the connecting block and connecting ropes are detachable, which can quickly remove the ultrasonic probe from the lifting rod, facilitating the daily maintenance and fault replacement of the ultrasonic probe.

[0024] With the help of the components, the top and side shafts can move the ultrasonic probe in multiple directions, the telescopic rod can extend and retract flexibly, and the length of the connecting rope can be adjusted, so that the ultrasonic probe can adapt to the detection needs of hollow axles at different angles and positions. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall device of the present invention;

[0026] Figure 2 This is a schematic diagram showing the positions of the lifting rod, top rotating shaft, ultrasonic probe, and other structures of the present invention.

[0027] Figure 3 This is a cross-sectional schematic diagram of the structure of the top rotating shaft, top plate, telescopic rod, etc. of the present invention;

[0028] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0030] Figure 6 This is a cross-sectional schematic diagram of the top rotating shaft, electric push rod, and other structures of the present invention;

[0031] Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle;

[0032] Figure 8 This is a cross-sectional schematic diagram of the top rotating shaft, telescopic rod, spring, and other structures of the present invention.

[0033] Figure 9 For the present invention Figure 8 Enlarged view of point D;

[0034] Figure 10 This is a cross-sectional schematic diagram of the universal swivel block, universal swivel shaft, ratchet, and other structures of the present invention.

[0035] Figure 11 For the present invention Figure 10 Enlarged view of point E in the middle;

[0036] Figure 12 For the present invention Figure 10Enlarged diagram at point F;

[0037] Figure 13 For the present invention Figure 10 Enlarged diagram of point G in the middle.

[0038] In the picture:

[0039] 11. Moving platform; 12. Lifting rod; 13. Ultrasonic probe;

[0040] Helper Components:

[0041] 21. Top pivot; 22. Top plate; 23. Fixing block; 24. Side pivot; 25. Telescopic rod; 26. Spring 1; 27. Connecting block; 28. Top groove; 29. ​​Connecting rod; 210. Insert rod; 211. Electric push rod; 212. Universal swivel block; 213. Universal pivot; 214. Connecting rope; 215. Connecting piece; 216. Guide groove block; 217. Hollow pivot; 218. Ratchet; 219. Torsion spring; 220. Side groove; 221. Connecting frame; 222. Pawl; 223. Bottom block; 224. Spring 2. Detailed Implementation

[0042] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0043] The embodiments provided by this invention:

[0044] Please see Figures 1 to 13 As shown, an auxiliary mechanical device for flaw detection of hollow axles includes a movable platform 11, a lifting rod 12 mounted on the movable platform 11, and an ultrasonic probe 13 suspended on the lifting rod 12.

[0045] The mobile platform 11 is equipped with a control panel. The lifting rod 12, mounted on the mobile platform 11, has the following characteristics: the lifting rod 12 can freely extend and retract in height on the mobile platform 11, and it can also rotate on the mobile platform 11. The purpose is to ensure that the lifting rod 12 provides a high degree of freedom in suspending the ultrasonic probe 13, thereby assisting the ultrasonic probe 13 in moving to the hollow axle flaw detection position. One side of the ultrasonic probe 13 is the ultrasonic transmitter. In actual use, i.e., when performing ultrasonic flaw detection on the hollow axles of high-speed trains or other rail vehicles without disassembling the wheels, the ultrasonic transmitter of the ultrasonic probe 13 needs to be inserted into the inner hole of the hollow axle to perform ultrasonic scanning flaw detection. The mobile platform 11, lifting rod 12, and ultrasonic probe 13 are all existing known technologies and will not be described in detail here.

[0046] The lifting rod 12 is equipped with an assist component, which is used to assist the movement of the ultrasonic probe 13.

[0047] The assistive assembly includes a top rotating shaft 21, which is fixedly connected to the lower surface of the top end of the lifting rod 12. A top plate 22 is rotatably connected to the bottom end of the top rotating shaft 21. A fixing block 23 is fixedly connected to the lower surface of the top plate 22. A side rotating shaft 24 is rotatably connected to the side wall of the fixing block 23. A telescopic rod 25 is fixedly connected to the side rotating shaft 24. The telescopic rod 25 includes a fixed shaft and a telescopic shaft. A spring 26 is installed inside the telescopic rod 25, and both ends of the spring 26 are fixedly connected to the fixed shaft and the telescopic shaft of the telescopic rod 25, respectively. The top of the ultrasonic probe 13 is detachably connected to a connecting... Block 27 is rotatably connected to the telescopic shaft end of the telescopic rod 25. A top groove 28 is provided on the top plate 22, and a connecting rod 29 is slidably connected within the top groove 28. A plug rod 210 is fixedly connected to each of the top and bottom ends of the connecting rod 29. An electric push rod 211 is fixedly connected to the top surface of the top plate 22. The electric push rod 211 consists of a fixed shaft and a telescopic shaft. The telescopic shaft end of the electric push rod 211 is fixedly connected to the plug rod 210 located at the top. Four universal rotating blocks 212 are fixedly connected in a rectangular array on the bottom surface of the top plate 22. A rotatable rod is rotatably connected to the bottom of each of the four universal rotating blocks 212. Each universal joint 213 has a connecting rope 214 fixedly connected to its bottom, and a connector 215 fixedly connected to each connecting rope 214. Four guide slots 216 are fixedly connected in a rectangular array on the side wall of the ultrasonic probe 13. Four hollow shafts 217 are rotatably connected in a rectangular array on the side wall of the ultrasonic probe 13. A ratchet 218 is fixedly connected to the end of each hollow shaft 217 away from the ultrasonic probe 13. A torsion spring 219 is installed inside each of the four hollow shafts 217. The two ends of the torsion springs 219... The ultrasonic probe 13 and ratchet 218 are fixedly connected to the ultrasonic probe 13 respectively. Four side slots 220 are formed in a rectangular array on the side wall of the ultrasonic probe 13. A connecting frame 221 is slidably connected in the four side slots 220. Four pawls 222 are fixedly connected in a rectangular array on the connecting frame 221. Four base blocks 223 are fixedly connected in a rectangular array on the side wall of the ultrasonic probe 13. A spring 224 is fixedly connected to the top surface of each of the four base blocks 223. The ends of the four springs 224 away from the base blocks 223 are fixedly connected to the lower surface of the connecting frame 221.

[0048] Where: Reference Figure 4 , Figure 9 As shown, the sidewalls of both the top rotating shaft 21 and the side rotating shaft 24 are toothed, and the sides of the two insert rods 210 away from the connecting rod 29 are also toothed. The toothed surfaces of the two insert rods 210 engage with the toothed surfaces of the top rotating shaft 21 and the side rotating shaft 24, respectively. Their function is to completely lock and limit the top rotating shaft 21 and the side rotating shaft 24 when both insert rods 210 are simultaneously engaged with both, thus preventing them from rotating.

[0049] It should be noted that the electric actuator 211 is electrically controlled by an external remote control.

[0050] The connecting block 27 is detachably connected to the ultrasonic probe 13 by bolts, which facilitates the user to remove the ultrasonic probe 13 from the lifting rod 12.

[0051] Where: Reference Figure 11 As shown, the universal joint 213 is connected to the universal joint block 212 in an upper limit rotational manner. Its function is to prevent the universal joint 213 from falling out of the universal joint block 212 while ensuring that the universal joint 213 can rotate flexibly.

[0052] Where: Reference Figure 13 As shown, four ratchet wheels 218 are located at the four corners of the ultrasonic probe 13. The ends of four connecting ropes 214 away from the corresponding universal joints 213 are fixedly connected to a hollow shaft 217, and the connecting ropes 214 are wound around the hollow shafts 217. It should be noted that when the torsion spring 219 undergoes elastic deformation, there is a tendency to wind the connecting ropes 214 around the hollow shafts 217.

[0053] Where: Reference Figure 12 As shown, the connector 215 consists of two threaded parts that separate the connecting rope 214 into two sections. One section is connected to the universal joint 213, and the other section is connected to the hollow joint 217. The user can combine the two sections of the connecting rope 214 into a whole or separate them by tightening or loosening the threads. This facilitates the user's removal of the ultrasonic probe 13 from the lifting rod 12.

[0054] The four connecting ropes 214 slide within corresponding guide slots 216, which serve as guides. The inner diameter of the guide slots 216 is smaller than that of the connector 215. When the threads of the two parts of the connector 215 are loosened, causing the connecting rope 214 to split into two segments, the section of connecting rope 214 connected to the hollow shaft 217 is wound and wrapped around the shaft under the elastic reset action of the hollow shaft 217. Meanwhile, the connector 215 will abut against the top of the guide slot 216 and cannot move further downwards. Thus, the connector 215 serves as the end of the connecting rope 214, facilitating the connection of the two sections of the connecting rope 214 when installing the ultrasonic probe 13.

[0055] The functions of spring 26 and connecting rope 214 are to provide an upward pulling force to the ultrasonic probe 13, and the four connecting ropes 214 are located at the four corners of the ultrasonic probe 13, and the connecting block 27 is located at the top center of the ultrasonic probe 13, so that the four corners and the middle of the ultrasonic probe 13 are evenly stressed, and also to provide a stabilizing effect to the ultrasonic probe 13.

[0056] Among them, ratchet 218 and pawl 222 are existing known technologies. Ratchet 218 and pawl 222 mesh with each other, and the meshing of ratchet 218 and pawl 222 has the characteristic of unidirectional and irreversible rotation. That is, when ratchet 218 and pawl 222 are meshed, ratchet 218 can only rotate in one direction, and it can prevent ratchet 218 from rotating in the opposite direction under load. Its function is to lock the winding state of connecting rope 214 on hollow rotating shaft 217 through the meshing characteristic of ratchet 218 and pawl 222.

[0057] The function of the connecting frame 221 is to connect the four pawls 222 into a whole, so that the user can press the connecting frame 221 to make the four pawls 222 move down synchronously until they are no longer engaged with the corresponding ratchet 218, thereby simultaneously unlocking the locked state of the four connecting ropes 214.

[0058] Among them, the function of spring 224 is to help the connecting frame 221 and the pawl 222 reset.

[0059] In the initial state of the power assist assembly, i.e., when the ultrasonic probe 13 does not need to perform ultrasonic flaw detection on the hollow axle, the structural states within the power assist assembly are as follows: The telescopic shaft end of the telescopic rod 25 is vertically downward. The telescopic shaft end of the electric push rod 211 is extended, and the connecting rod 29 is located in the top groove 28 near the end of the top rotating shaft 21. The two insert rods 210 are respectively engaged with the top rotating shaft 21 and the side rotating shaft 24. The connecting block 27 is threaded onto the ultrasonic probe 13. The two parts of the connector 215 are threaded tight. The connector 215 connects the two ends of the connecting rope 214 into a whole. The spring 224 does not undergo elastic deformation. The four pawls 222 are respectively engaged with the corresponding ratchet 218.

[0060] When the assist component is running, i.e. when the ultrasonic probe 13 needs to perform ultrasonic flaw detection on the hollow axle, the user pushes the moving stage 11 to move the ultrasonic probe 13 to the vicinity of the hollow axle to be inspected, and controls the operation of the lifting rod 12, so that the lifting rod 12 drives the ultrasonic probe 13 to rise, fall and rotate, so that the ultrasonic probe 13 is close to the hollow axle to be inspected, and the ultrasonic transmitting end of the ultrasonic probe 13 faces the inner hole side of the hollow axle to be inspected.

[0061] At this point, with the cooperation of the moving stage 11 and the lifting rod 12, the ultrasonic probe 13 has completed the initial positioning of the flaw detection location. That is, the ultrasonic probe 13 still needs fine position adjustment so that the ultrasonic transmitting end of the ultrasonic probe 13 extends into the inner hole of the hollow axle to be inspected. Then, the operation of the assist component is required, as follows:

[0062] The user controls the telescopic shaft of the electric push rod 211 to retract via a remote control. The telescopic shaft of the electric push rod 211 drives the connected insertion rod 210 to move away from the top rotating shaft 21. This insertion rod 210, through the connecting rod 29, drives another insertion rod 210 to move synchronously, causing the connecting rod 29 to slide away from the top rotating shaft 21 within the top groove 28. Neither insertion rod 210 is now engaged with the top rotating shaft 21 or the side rotating shaft 24. At this point, the top rotating shaft 21 and the side rotating shaft 24 are no longer locked and limited. The top plate 22 can rotate at the bottom of the top rotating shaft 21, and the telescopic rod 25 can rotate at the bottom of the top plate 22 via the side rotating shaft 24. Therefore, the ultrasonic probe 13 can move flexibly in multiple directions via the top rotating shaft 21 and the side rotating shaft 24.

[0063] At this time, the user can move the ultrasonic probe 13 according to the position of the inner hole of the hollow axle to be inspected. Compared with the previous movement with the cooperation of the moving platform 11 and the lifting rod 12, the movement of the ultrasonic probe 13 at this time is a fine adjustment, the purpose of which is to smoothly insert the ultrasonic transmitting end of the ultrasonic probe 13 into the inner hole of the hollow axle.

[0064] When the height of the ultrasonic probe 13 on the lifting rod 12 changes, i.e., when the user moves the ultrasonic probe 13 up and down to fine-tune it, the tautness of the connecting ropes 214 changes synchronously. To maintain the tautness of the four connecting ropes 214, the user needs to press down on the connecting frame 221 while moving the ultrasonic probe 13. This causes the connecting frame 221 to slide downwards within the four side grooves 220, elastically compressing the four springs 224. This prevents the four pawls 222 from engaging with the corresponding ratchet 218, thus unrestricting the elastic return of the torsion spring 219. As the torsion spring 219 returns to its elastic state, it drives the hollow shaft 217 to rotate via the ratchet 218, causing the connecting ropes 214 to be wound up on the hollow shaft 217. As the connecting ropes 214 are wound up, the connection between the four connecting ropes 214 and the top plate 22 is straightened and tightened. This provides an upward pulling force to the ultrasonic probe 13, sharing the weight of the user when moving the ultrasonic probe 13.

[0065] When moving the ultrasonic probe 13, since the user only needs to move the ultrasonic probe 13 to align with the hollow axle to be inspected, the four connecting ropes 214 remain taut at all times. The four connecting ropes 214 always distribute the weight of the ultrasonic probe 13 through the deformation of the corresponding torsion springs 219, and through the connection between the connecting ropes 214 and the top plate 22, the weight of the ultrasonic probe 13 is distributed to the top plate 22. Thus, during the user's movement of the ultrasonic probe 13, the weight of the ultrasonic probe 13 is distributed by the four connecting ropes 214, which plays a role in assisting the user.

[0066] When the ultrasonic probe 13 does not need to be moved in height, the user can stop pressing the connecting frame 221, causing the connecting frame 221 to drive the four pawls 222 to reset, and the pawls 222 to re-engage with the ratchet 218, thereby limiting the tension of the connecting rope 214.

[0067] When the height of the ultrasonic probe 13 is adjusted to be flush with the hollow axle to be inspected, the user needs to horizontally insert the ultrasonic generating end of the ultrasonic probe 13 into the inner hole of the hollow axle. At this point, the ultrasonic probe 13 needs to be moved horizontally. While pressing the connecting frame 221, the user shares the weight of the ultrasonic probe 13 and then moves it horizontally, bringing it closer to the hollow axle. This horizontal movement of the ultrasonic probe 13 causes the telescopic rod 25 to deflect. The telescopic shaft of the telescopic rod 25 will extend or retract according to the tilt, causing the spring 26 to deform elastically. However, since the telescopic rod 25 is rotatably connected to the ultrasonic probe 13 via the connecting block 27, and the four corners of the ultrasonic probe 13 are evenly pulled upwards by the four connecting ropes 214, the ultrasonic probe 13 will not tilt as the telescopic rod 25 tilts. The ultrasonic probe 13 will remain horizontally inserted into the inner hole of the hollow axle, meaning the ultrasonic probe 13 has moved to the inspection position on the hollow axle.

[0068] It should be noted that spring 26 always provides an upward pulling force to the ultrasonic probe 13, in order to share the weight of the ultrasonic probe 13 and assist the user.

[0069] After completion, the user stops pressing the connecting frame 221 and re-engages the pawl 222 with the ratchet 218, thereby limiting the tension of the four connecting ropes 214. Simultaneously, the user extends the telescopic shaft of the electric push rod 211 via remote control, causing the two insert rods 210 to connect to the top rotating shaft 21 and the side rotating shaft 24 respectively, locking and limiting the top rotating shaft 21 and the side rotating shaft 24. With the top rotating shaft 21 locked, the top plate 22, ultrasonic probe 13, and other structures can no longer rotate horizontally. With the side rotating shaft 24 locked, the telescopic rod 25 cannot rotate, the ultrasonic probe 13 cannot rotate vertically, and all four connecting ropes 214 are taut. At this point, the ultrasonic probe 13 is evenly stressed at its four corners and center, and its position is locked by the two insert rods 210 connecting to the top rotating shaft 21 and the side rotating shaft 24. The ultrasonic probe 13 is now locked at the flaw detection position on the hollow axle. It can effectively prevent the ultrasonic probe 13 from shifting and causing interference during ultrasonic flaw detection.

[0070] After the ultrasonic flaw detection of the hollow axle is completed, the user controls the remote control to retract the telescopic shaft of the electric push rod 211, contacting the locked state of the ultrasonic probe 13, and moving the ultrasonic probe 13 to directly below the top plate 22, so that the telescopic rod 25 is back in a vertical state. At this time, the power assist assembly reset is completed.

[0071] In summary, by facilitating the operation of the components, the following beneficial effects can be achieved:

[0072] The existing equipment relies on rigid rods to support the ultrasonic probe 13, and the user must completely overcome the weight of the ultrasonic probe 13 to push and pull.

[0073] By using the assistive components, a tension structure is designed at the four corners and the center of the ultrasonic probe 13 to always provide an upward pulling force. Although it cannot pull the ultrasonic probe 13 up, it greatly offsets the weight of the ultrasonic probe 13 and can share the weight of the ultrasonic probe 13. When the user moves the ultrasonic probe 13, he / she no longer needs to bear the full weight of himself / herself, which solves the problems of heavy feel and difficult operation.

[0074] Existing equipment has difficulty achieving minute and smooth adjustments when aligning with the flaw detection position of hollow axles.

[0075] With the operation of the assist component, the connecting rope 214 is always kept taut, which can prevent the ultrasonic probe 13 from shaking. At the same time, the telescopic rod 25 can move and extend flexibly with the ultrasonic probe 13. The top rotating shaft 21 and the side rotating shaft 24 can rotate synchronously. The coordination of extension and rotation makes the posture of the ultrasonic probe 13 more controllable when it moves, and the user can easily make small-amplitude position adjustments.

[0076] The existing equipment is prone to displacement due to its own weight or slight disturbance when the ultrasonic probe 13 is inserted into the hollow axle for ultrasonic flaw detection.

[0077] With the operation of the assist component, the synchronous locking structure of the top rotating shaft 21 and the side rotating shaft 24 cooperates with the four connecting ropes 214. After the ultrasonic probe 13 moves to the target flaw detection position, the top rotating shaft 21 and the side rotating shaft 24 are locked. In addition, the tension of the connecting ropes 214 can firmly fix the position of the ultrasonic probe 13, which can prevent the ultrasonic probe 13 from shifting during flaw detection. Furthermore, the user does not need to hold the ultrasonic probe 13 for a long time, nor does it require assistance from others, thus improving convenience.

[0078] With the operation of the assist component, spring 26 can assist telescopic rod 25 in resetting ultrasonic probe 13, and the taut state of the four connecting ropes 214 can help ultrasonic probe 13 quickly return to its initial position. In addition, connecting block 27 and connecting ropes 214 are detachable, which can quickly remove ultrasonic probe 13 from lifting rod 12, making it convenient for daily maintenance and fault replacement of ultrasonic probe 13.

[0079] With the help of the components, the top rotating shaft 21 and the side rotating shaft 24 can move the ultrasonic probe 13 in multiple directions. The telescopic rod 25 can be extended and retracted flexibly. Combined with the length adjustment capability of the connecting rope 214, the ultrasonic probe 13 can adapt to the detection needs of different angles and positions of the hollow axle to be inspected.

[0080] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical aid for flaw detection of hollow axles, comprising a movable platform (11), a lifting rod (12) mounted on the movable platform (11), and an ultrasonic probe (13) suspended on the lifting rod (12), characterized in that: A power assist assembly is provided on the lifting rod (12) to assist the movement of the ultrasonic probe (13). The power assist assembly includes a top rotating shaft (21) and a side rotating shaft (24). The top rotating shaft (21) is fixedly connected to the lower surface of the top end of the lifting rod (12), and the side rotating shaft (24) is provided at the bottom of the top rotating shaft (21). The top rotating shaft (21) and the side rotating shaft (24) are used to provide the ultrasonic probe (13) with rotational freedom. A telescopic rod (25) is fixedly connected to the side rotating shaft (24) for telescopic movement. The rod (25) is used to provide the ultrasonic probe (13) with horizontal movement freedom. The telescopic shaft end of the telescopic rod (25) is rotatably connected to the connecting block (27). The connecting block (27) is detachably connected to the top surface of the ultrasonic probe (13). The connecting block (27) is located in the center of the top of the ultrasonic probe (13). A connecting rope (214) is provided at each of the four corners of the side wall of the ultrasonic probe (13). The connecting rope (214) is used to provide the ultrasonic probe (13) with upward tension.

2. The assistive mechanical device for flaw detection of hollow axles according to claim 1, characterized in that: The assistive assembly also includes a top plate (22), which is rotatably connected to the bottom end of the top rotating shaft (21). A fixing block (23) is fixedly connected to the lower surface of the top plate (22). The side rotating shaft (24) is rotatably connected to the side wall of the fixing block (23). The telescopic rod (25) includes a fixed shaft and a telescopic shaft. A spring (26) is provided inside the telescopic rod (25). The two ends of the spring (26) are fixedly connected to the fixed shaft and the telescopic shaft of the telescopic rod (25) respectively. A top groove (28) is provided on the top plate (22). A connecting rod (29) is slidably connected inside the top groove (28). 9) has a fixed rod (210) at each of its top and bottom ends. The top surface of the top plate (22) has a fixed electric push rod (211). The electric push rod (211) is divided into a fixed shaft and a telescopic shaft. The telescopic shaft end of the electric push rod (211) is fixedly connected to the rod (210) at the top. The bottom surface of the top plate (22) has four universal rotating blocks (212) fixedly connected in a rectangular array. The bottom of each of the four universal rotating blocks (212) is rotatably connected to a universal rotating shaft (213). The four connecting ropes (214) are fixedly connected to the bottom ends of the four universal rotating shafts (213) respectively.

3. The assistive mechanical device for flaw detection of hollow axles according to claim 1, characterized in that: The assistive assembly also includes four connectors (215), which are fixedly connected to four connecting ropes (214). Four guide slots (216) are fixedly connected in a rectangular array on the side wall of the ultrasonic probe (13). Four hollow shafts (217) are rotatably connected in a rectangular array on the side wall of the ultrasonic probe (13). A ratchet (218) is fixedly connected to the end of each of the four hollow shafts (217) away from the ultrasonic probe (13). A torsion spring (219) is provided inside each of the four hollow shafts (217). The two ends of the torsion springs (219) are respectively connected to the ultrasonic probe (13). The ultrasonic probe (13) is fixedly connected to the ratchet (218). Four side slots (220) are provided in a rectangular array on the side wall of the ultrasonic probe (13). A connecting frame (221) is slidably connected in the four side slots (220). Four pawls (222) are fixedly connected in a rectangular array on the connecting frame (221). Four base blocks (223) are fixedly connected in a rectangular array on the side wall of the ultrasonic probe (13). A spring II (224) is fixedly connected to the top surface of each of the four base blocks (223). The ends of the four spring IIs (224) away from the base blocks (223) are fixedly connected to the lower surface of the connecting frame (221).

4. The assistive mechanical device for flaw detection of hollow axles according to claim 1, characterized in that: The sidewalls of the top rotating shaft (21) and the side rotating shaft (24) are both set with toothed surfaces. The side of the two insert rods (210) away from the connecting rod (29) is set with toothed surfaces. The toothed surfaces of the two insert rods (210) are respectively engaged with the toothed surfaces of the top rotating shaft (21) and the side rotating shaft (24).

5. The assistive mechanical device for flaw detection of hollow axles according to claim 1, characterized in that: The connecting block (27) is detachably connected to the ultrasonic probe (13) by bolts.

6. The assistive mechanical device for flaw detection of hollow axles according to claim 1, characterized in that: The ends of the four connecting ropes (214) away from the corresponding universal joint (213) are fixedly connected to a hollow joint (217), and the connecting ropes (214) are wrapped around the hollow joint (217).

7. The assistive mechanical device for flaw detection of hollow axles according to claim 2, characterized in that: The connector (215) is divided into two threaded parts. The connector (215) divides the connecting rope (214) into two sections, one of which is connected to the universal joint (213) and the other of which is connected to the hollow joint (217).

8. The assistive mechanical device for flaw detection of hollow axles according to claim 2, characterized in that: The four connecting ropes (214) slide in a corresponding guide groove (216).

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