Crack detection device of annular structure

Abstract

The invention discloses a crack detection device of an annular structure, which comprises a detection box, a feeding device and oil rings, and is characterized in that the feeding device is arranged above the detection box, and a plurality of oil rings are placed in the feeding device; a material receiving device and a sound signal processor are arranged in the detection box, a material falling hole is formed in the top of the detection box corresponding to the feeding device, and the feeding device can transfer the oil ring to the position above the material falling hole, so that the oil ring falls onto the material receiving device in the detection box from the material falling hole; the sound signal processor can collect sound signals generated when the oil ring collides with the material receiving device at the moment that the oil ring falls on the material receiving device, and whether cracks exist in the oil ring or not is judged through the sound signals. The continuous and ordered batch feeding of the oil rings is realized through the collaborative design of the feeding turntable and the material collecting barrel; the falling horizontal posture correction of the oil ring is realized through graded guiding of the conical pipe and the damping pipe; collision signals are accurately collected through the acoustic signal processor, and efficient and accurate detection of oil ring cracks is achieved.

Description

Technical Field

[0001] This invention belongs to the field of non-destructive testing technology for mechanical parts, and more specifically, it is a crack detection device with a ring structure. Background Technology

[0002] In the manufacturing of ring-shaped parts (such as oil rings), crack defects directly affect their assembly accuracy and safety of use. Crack detection technology based on acoustic signal recognition has become one of the mainstream detection solutions due to its advantages such as convenient operation, controllable cost, and non-destructive nature. However, existing crack detection technologies for ring parts have many shortcomings that urgently need to be addressed. The uncontrolled falling posture of the parts leads to poor detection accuracy. The material dropping structure of existing devices lacks an effective guiding and limiting design. When the oil ring falls from the material dropping port, it is easily affected by factors such as rotational inertia and uneven gravity distribution, and may collide with the detection table in an inclined or offset state. This non-standard collision state will lead to unstable contact area and force distribution, which in turn will cause acoustic signal distortion, interfere with the effective identification of crack characteristic signals, and significantly increase the false judgment rate and false negative rate, making it impossible to guarantee the reliability of the detection results. Secondly, the feeding mechanism is poorly designed, with the risk of jamming and collision, and it is difficult to achieve continuous and stable feeding. Existing feeding turntables often suffer from insufficient structural parameter matching. For example, the turntable height may not match the oil ring thickness, leading to scratching and jamming during rotation, causing feeding interruptions. Furthermore, some devices have unreasonable designs regarding the number and arrangement of turntable grooves and rotation speed, failing to achieve continuous and orderly oil ring transport. This results in either intermittent feeding with low efficiency or uneven detection intervals between oil rings, compromising the independence and consistency of detection and making it difficult to adapt to the pace of large-scale mass production. These core defects directly limit the application effect of acoustic signal recognition technology in batch crack detection of oil rings, failing to meet the core requirements of industrial production for detection accuracy, efficiency, and stability. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a ring-shaped crack detection device that achieves continuous and orderly batch feeding of oil rings through the coordinated design of the feeding turntable and the collecting cylinder; achieves horizontal posture correction of falling oil rings through the graded guidance of the tapered tube and the damping tube; and achieves efficient and accurate detection of oil ring cracks by accurately collecting collision signals through the acoustic signal processor.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a ring-shaped crack detection device, comprising a detection box, a feeding device, and an oil ring. The feeding device is positioned above the detection box, and several oil rings are placed inside the feeding device. The detection box is equipped with a receiving device and an acoustic signal processor. A drop hole is provided on the top of the detection box corresponding to the feeding device. The feeding device can transfer the oil rings above the drop hole, so that the oil rings fall from the drop hole onto the receiving device in the detection box. The acoustic signal processor can collect the sound signal emitted when the oil ring collides with the receiving device at the moment it falls onto the receiving device, and determine whether there is a crack in the oil ring by using the sound signal.

[0005] Furthermore, the feeding device includes a feeding turntable, a rotating motor, and a collecting cylinder. The feeding turntable is rotatably mounted on the outer surface of the upper wall of the detection box, and a plurality of capturing holes are arranged in a circular array on the feeding turntable. The rotating motor is located on the side of the feeding turntable away from the detection box, and the drive shaft of the rotating motor is coaxially connected to the feeding turntable. The collecting cylinder is fixedly mounted on the outer surface of the upper wall of the detection box by a bracket. In the assembled state, each capturing hole on the feeding turntable moves sequentially to directly below the collecting cylinder as the feeding turntable rotates. When any one capturing hole on the feeding turntable rotates to directly below the collecting cylinder, the other capturing hole on the feeding turntable is located directly above the discharge hole.

[0006] Furthermore, the receiving device includes a sliding inclined plane, a detection platform, and a pushing device. The detection platform is fixedly installed inside the detection box by a mounting base and is located directly below the material drop hole. The sliding inclined plane is inclined on one side of the detection platform, with its higher end coplanar with the detection platform and its lower end fixedly connected to the inner surface of one side wall of the detection box. A discharge port is provided on the side wall of the detection box near the sliding inclined plane, corresponding to the lower end of the sliding inclined plane. The pushing device is located on the other side of the detection platform relative to the sliding inclined plane. The telescopic plate of the pushing device can push the oil ring that falls on the detection platform to the sliding inclined plane. The oil ring can slide along the sliding inclined plane and slide out of the detection box from the discharge port.

[0007] Furthermore, it also includes a mounting plate, which corresponds to the detection platform. The mounting plate is an "L"-shaped plate, wherein one section of the mounting plate extends along the length direction of the detection box, and the other section extends along the width direction of the detection box. In the assembled state, the mounting plate forms a semi-enclosed state with the material receiving device on the horizontal plane where it is installed. The acoustic signal processor corresponds to the detection platform and is fixed on the section of the mounting plate extending along the length direction of the detection box. The pushing device corresponds to the detection platform and is fixed on the section of the mounting plate extending along the width direction of the detection box.

[0008] Furthermore, it also includes a guide assembly, which includes an isolation plate and a guide tube. The isolation plate is disposed above the detection platform and has a through drop hole. One end of the guide tube passes coaxially through the drop hole on the side of the isolation plate near the detection platform. The guiding effect of the guide tube enables the oil ring to fall horizontally from the guide tube onto the detection platform.

[0009] Furthermore, the guide tube includes a tapered tube and a damping tube. The drive shaft of the rotating motor passes through the upper wall of the detection box and is located inside the detection box. A drive gear is coaxially sleeved on one end of the drive shaft of the rotating motor inside the detection box. A driven gear ring that can mesh with the drive gear is coaxially sleeved on the outer wall of the larger diameter end of the tapered tube. The larger diameter end of the tapered tube is coaxially rotatably mounted on the inner side of the upper wall of the detection box. The damping tube is coaxially rotatably mounted in the drop hole. One end of the damping tube is coaxially connected to the smaller diameter end of the tapered tube, and the other end passes through the drop hole to the side of the isolation plate near the detection platform.

[0010] Furthermore, the damping tube is provided with a cylindrical damping block and a connecting block. The cross-section of the connecting block is the same as the notch shape on the oil ring. The connecting block is fixedly connected to the isolation plate and is located in the drop hole along the radial direction of the drop hole. The damping block is fixed in the damping tube coaxially through the connecting block, and the radius of the damping block is equal to the inner diameter of the oil ring. A sliding space is formed between the damping block and the inner wall of the damping tube, and the oil ring slides in the sliding space along the axial direction of the damping tube.

[0011] Furthermore, the damping tube is segmented, that is, the damping tube includes a first tube segment and a second tube segment. The first tube segment is located on the side of the isolation plate near the detection platform and is fixedly connected to the isolation plate, and is coaxially arranged with the drop hole. The second tube segment is located on the side of the isolation plate away from the detection platform and is integrally connected to the end of the tapered tube with the smaller diameter on the same axis. The end of the second tube segment away from the tapered tube is rotatably fitted in the drop hole on the same axis.

[0012] Beneficial Effects: Compared with existing technologies, the ring-shaped crack detection device of this invention achieves continuous and orderly batch feeding of oil rings through the alternating corresponding design of the circumferential array of capture holes and drop holes on the feeding turntable, combined with the clearance fit of the hole diameter settings. This solves the problems of low feeding efficiency and easy congestion in existing devices, thereby improving the efficiency of large-scale detection. The initial limiting of the tapered tube with its gradually changing diameter, combined with the dual radial limiting of the damping tube and damping block, achieves horizontal correction of the oil ring's falling posture, avoiding acoustic signal distortion caused by tilted drops. This solves the problem that the detection accuracy of existing devices is greatly affected by posture, ensuring the consistency of the detection posture. The axial force generated by the friction transmission between the damping block and the rotating damping tube drives the oil ring to slide down at a uniform speed, offsetting the initial... The speed difference ensures uniformity of the impact force of each oil ring falling, solving the problem of large signal dispersion in existing devices and improving the accuracy of acoustic signal detection. A linkage structure, where the damping tube stops rotating when the oil ring is jammed, causing the driven gear ring and drive gear to fail to mesh and the motor to stop, enables automatic identification of jammed conditions. Combined with an alarm device, this provides timely warnings, resolving the problem of delayed jamming handling in existing devices and ensuring continuous and stable equipment operation. The shape matching design of the connecting block and the oil ring notch enables directional sliding of the oil ring, while strengthening the limiting effect during jamming, solving the problem of disordered posture of annular parts with notches, and further improving detection stability and the reliability of jamming warnings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the ring-shaped crack detection device of the present invention from a frontal view.

[0014] Figure 2 This is a schematic diagram of the ring-shaped crack detection device of the present invention from a bottom-view perspective.

[0015] Figure 3 This is a structural cross-sectional view of the guide component. Detailed Implementation

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] like Figures 1-3As shown, a ring-shaped crack detection device includes a detection box 1, a feeding device 2, and oil rings 3. The feeding device 2 is positioned above the detection box 1, and several oil rings 3 are placed inside the feeding device 2. The detection box 1 is equipped with a receiving device 8 and a sound signal processor 15. The top of the detection box 1 has a drop hole 19 corresponding to the feeding device. The feeding device 2 can transfer the oil rings 3 above the drop hole 19, so that the oil rings 3 fall from the drop hole 19 onto the receiving device 8 in the detection box 1. The sound signal processor 15 can... The sound signal processor 15 can collect the sound signal emitted when the oil ring 3 collides with the receiving device 8 at the moment it falls onto the receiving device 8, and determine whether there is a crack in the oil ring 3 by using the sound signal. Since the interaction force (impact force) generated between the oil ring 3 of the same material and specifications and the receiving device 8 at almost the same speed is the same, the sound signal generated at the moment of collision is also almost the same. However, if there is a crack in the oil ring 3, it will cause the sound signal generated at the moment of collision to deviate. This is because the crack will destroy the structural integrity of the oil ring 3, resulting in uneven overall stiffness and changes in the way energy is absorbed and transmitted during the collision. Some energy will be consumed or reflected by the crack gap. Therefore, by identifying such deviations in the sound signal (such as frequency shift, amplitude fluctuation, waveform distortion, etc.) by the sound signal processor 15, it is possible to detect whether there is a crack in the oil ring 3.

[0018] The feeding device 2 includes a feeding turntable 4, a rotating motor 6, and a collecting cylinder 7. The feeding turntable 4 is rotatably mounted on the outer surface of the upper wall of the detection box 1, and a plurality of capturing holes 5 are arranged in a circular array on the feeding turntable 4. The rotating motor 6 is located on the side of the feeding turntable 4 away from the detection box 1, and the drive shaft of the rotating motor 6 is coaxially connected to the feeding turntable 4. The collecting cylinder 7 is mounted on the outer surface of the upper wall of the detection box 1 via a bracket, and a plurality of oil rings 3 are placed in the collecting cylinder 7. Inside, and in the assembled state, each capturing hole 5 on the feeding turntable 4 can move sequentially to directly below the collecting cylinder 7 as the feeding turntable 4 rotates. When any one capturing hole 5 on the feeding turntable 4 rotates to directly below the collecting cylinder 7 and is coaxially aligned with the collecting cylinder 7, another capturing hole 5 on the feeding turntable 4 with an oil ring 3 is located directly above the dropping hole 19 and is coaxially aligned with the dropping hole 19. In addition, the feeding turntable 4, the rotating motor 6, and the collecting cylinder 7 can all be detachably mounted on the detection box 1.

[0019] More specifically, the diameter of the capturing hole 5 is slightly larger than the maximum outer diameter of the oil ring 3. This design ensures that when the oil ring 3 falls from the collecting cylinder 7 into the capturing hole 5, it is in a clearance fit with the capturing hole 5. This guarantees that the oil ring 3 falls into the capturing hole 5 at the instant when the capturing hole 5 and the collecting cylinder 7 are in coaxial alignment. As those skilled in the art should understand, since the feeding turntable 4 is always rotating at a constant speed under the drive of the rotating motor 6, the coaxial alignment of the capturing hole 5 and the collecting cylinder 7 only exists for a moment. Therefore, a clearance fit is required to ensure that the oil ring 3 can fall into the capturing hole 5. Of course, the rotating motor 6 can also be replaced with a stepper motor with a specific step angle. In this way, when the stepper motor receives a pulse... After the signal is received, the feeding turntable 4 will rotate at a certain angle and stop when a capture hole 5 is located directly below the collecting cylinder 7 and is coaxial with the collecting cylinder 7. Correspondingly, the diameter of the dropping hole 19 should be slightly larger than the maximum outer diameter of the oil ring 3. In the embodiment described in this scheme, the diameter of the dropping hole 19 is equal to the diameter of the capture hole 5. In addition, the thickness of the feeding turntable 4 is equal to the thickness of the oil ring 3. The feeding turntable 4 adopts a modular structure, that is, the thickness of the feeding turntable 4 and the diameter of the capture hole 5 are all corresponding to the specifications of the oil ring 3. Different specifications of oil ring 3 have corresponding feeding turntables 4. Therefore, only by replacing the feeding turntable 4 and adjusting the height of the collecting cylinder 7, a set of testing equipment can be used to perform crack inspection on oil ring 3 of different specifications.

[0020] The receiving device 8 includes a sliding inclined plane 9, a detection platform 10, and a pushing device 13. The detection platform 10 is fixedly installed inside the detection box 1 by a mounting base 11, and the detection platform 10 is located directly below the material drop hole 19. The sliding inclined plane 9 is inclined on one side of the detection platform 10, and the pushing device 13 is located on the other side of the detection platform 10 relative to the sliding inclined plane 9. The higher end of the sliding inclined plane 9 is coplanar with the detection platform 10, and the lower end is fixedly connected to the inner surface of one side wall of the detection box 1. The detection box 1 has a discharge port 16 on the side wall near the sliding inclined plane 9 corresponding to the lower end of the sliding inclined plane 9. The telescopic plate 14 of the pushing device 13 can push the oil ring 3 that falls on the detection platform 10 onto the sliding inclined plane 9. The oil ring 3 can slide along the sliding inclined plane 9 and slide out of the detection box 1 from the discharge port 16.

[0021] It also includes a mounting plate 12, which is an "L"-shaped plate. One section of the mounting plate 12 extends along the length direction of the detection box 1, and the other section extends along the width direction of the detection box 1. The mounting plate 12 is set corresponding to the detection platform 10 and is fixedly connected to the inner surface of the two side walls of the detection box 1. In the assembled state, the mounting plate 12 forms a semi-enclosed state with the material receiving device 8 on the horizontal plane where it is installed. The sound signal processor 15 is fixed to the section of the mounting plate 12 extending along the length direction of the detection box 1, corresponding to the detection platform 10. The pushing device 13 is fixed to the section of the mounting plate 12 extending along the width direction of the detection box 1, corresponding to the detection platform 10.

[0022] To ensure that the oil ring 3 is in a horizontal position when it falls onto the detection platform 10, a guide assembly is also included. The guide assembly includes an isolation plate 17 and a guide tube 18. The isolation plate 17 is disposed above the detection platform 10 and has a through drop hole 20. One end of the guide tube 18 passes coaxially through the drop hole 20 on the side of the isolation plate 17 near the detection platform 10. The guiding effect of the guide tube 18 enables the oil ring 3 to fall horizontally from the guide tube 18 onto the detection platform 10.

[0023] The guide tube 18 includes a tapered tube 21 and a damping tube 22. The drive shaft of the rotating motor 6 passes through the upper wall of the detection box 1 inside the detection box 1. A drive gear 23 is coaxially sleeved on one end of the drive shaft of the rotating motor 6 inside the detection box 1. A driven gear ring 24 that can mesh with the drive gear is coaxially sleeved on the outer wall of the larger diameter end of the tapered tube 21. The larger diameter end of the tapered tube 21 is coaxially rotatably mounted on the inner side of the upper wall of the detection box 1. The damping tube 22 is coaxially rotatably mounted in the drop hole 20. One end of the damping tube 22 is connected to the smaller diameter end of the tapered tube 21. One end is coaxially connected, and the other end passes through the drop hole 20 on the side of the isolation plate 17 near the detection platform 10; more specifically, the diameter of the larger diameter end of the tapered tube 21 is the same as the diameter of the drop hole 19, and the diameter of the smaller diameter end of the tapered tube 21 is equal to the maximum outer diameter of the oil ring 3. In this way, when the oil ring 3 slides in the tapered tube 21, it can be initially adjusted horizontally under the limiting action of the inner wall of the tapered tube 21. The diameter of the damping tube 22 is equal to the diameter of the smaller diameter end of the tapered tube 21. The damping tube 22 can reduce the drop speed of the oil ring 3 located inside it and further adjust the horizontal level of the oil ring 3.

[0024] A cylindrical damping block 25 and a connecting block 26 are coaxially arranged in the damping tube 22. The cross-section of the connecting block 26 is the same as the notch shape on the oil ring 3. The connecting block 26 is fixedly connected to the isolation plate 17 and is located in the drop hole 20 along the radial direction of the drop hole 20. The damping block 25 is coaxially fixed in the damping tube 22 through the connecting block 26, and the radius of the damping block 25 is equal to the inner ring diameter of the oil ring 3. A sliding space 27 is formed between the damping block 25 and the inner wall of the damping tube 22. The oil ring 3 slides in the sliding space 27 along the axial direction of the damping tube 22.

[0025] The damping tube 22 is segmented, comprising a first segment 28 and a second segment 29. The first segment 28 is located on the side of the isolation plate 17 near the detection platform 10 and is fixedly connected to the isolation plate 17, and is coaxially arranged with the drop hole 20. The second segment 29 is located on the side of the isolation plate 17 away from the detection platform 10 and is coaxially integrally connected to the end of the tapered tube 21 with the smaller diameter. The end of the second segment 29 away from the tapered tube 21 is coaxially rotated within the drop hole 20. This not only ensures that the second segment 29 can rotate synchronously with the tapered tube 21, thus achieving the same effect as described above, but also further ensures that the oil ring 3 is in a horizontal state when it slides out of the damping tube 22 through the first segment 28.

[0026] When the oil ring 3 falls from the discharge hole 19 into the tapered tube 21 under the drive of the feeding turntable 4, the gradually changing diameter of the tapered tube 21 radially limits the oil ring 3, thus performing preliminary horizontal correction. When the oil ring 3 slides from the tapered tube 21 into the damping tube 22, under the action of the cylindrical damping block 25, the oil ring 3 will temporarily be in a semi-locked state in the damping tube 22. This semi-locked state is because at this time, the outer ring wall of the oil ring 3 and the inner wall of the damping tube 22, and the inner ring wall of the oil ring 3 and the outer wall of the damping block 25 are in frictional contact. It does not mean that the oil ring 3 is stuck in the damping tube 22 and cannot move. In the above state, due to the drive of the rotating motor 6 As the shaft continues to rotate, the drive gear 23 rotates synchronously with the rotating motor 6 and drives the driven gear ring 24 to mesh and transmit power, thereby driving the tapered tube 21 to drive the damping tube 22 to rotate around the axis. Since the damping block 25 is fixedly connected to the isolation plate 17 through the connecting block 26, the damping tube 22 will form a stable relative rotation with the damping block 25 when it rotates. Therefore, the circumferential friction between the inner wall of the damping tube 22 and the outer wall of the oil ring 3 will decompose into an axial component. The circumferential friction between the inner ring wall of the oil ring 3 and the outer wall of the damping block 25 will also decompose into an axial component. The above-mentioned axial component can enable the oil ring 3 to overcome the frictional damping between itself and the damping block 25, thereby driving the oil ring 3 to slide slowly along the axial direction of the damping tube 22.

[0027] During this process, the damping block 25 reduces the sliding speed of the oil ring 3 through frictional damping, reducing the tilting of the oil ring 3 caused by excessive friction on one side. The inner wall of the damping tube 22 and the outer wall of the damping block 25 form a double radial limit on the oil ring 3 from the inside to the outside and from the outside to the inside, so that the radial force of each region of the oil ring 3 tends to be symmetrical, ensuring that the oil ring 3 always remains horizontal when sliding between the relatively rotating damping tube 22 and the stationary damping block 25, and the oil ring 3 that finally slides out of the damping tube 22 and falls to the detection platform 10 is also in a horizontal state.

[0028] Furthermore, this design also prevents subsequent oil rings 3 from entering the pipe under the action of the feeding disc 4 and the rotating motor 6 when one oil ring 3 is stuck in the pipe, thus avoiding complete blockage of the pipe. More specifically, if the oil ring 3 is not in a horizontal position, it will inevitably get stuck in the damping tube 22. Since the damping block 25 is fixed, when the oil ring 3 is stuck in the damping tube 22, the damping tube 22 and the tapered tube 21 cannot rotate. This further causes the drive gear 23 and the driven gear ring 24 to remain meshed but unable to transmit power relative to each other, which in turn causes the load on the rotating motor 6 to increase sharply and enter a stall state. Ultimately, the feeding disc 4 cannot continue to feed the oil rings 3 in the material cylinder 7 into the detection box 1. Therefore, in the above state, it is only necessary to sound an alarm through the alarm device connected to the rotating motor 6 to remind the staff to remove the oil ring 3 stuck in the damping tube 22.

[0029] More specifically, in designing the damping tube 22, damping block 25, and connecting block 26, it should be ensured that the length of the damping block 25 is consistent with the length of the second tube segment 29, while the upper surface of the connecting block 26 is lower than the upper surface of the damping block 25, and the height difference between the upper surface of the connecting block 26 and the upper surface of the damping block 25 is not less than the thickness of the oil ring 3. Thus, after the oil ring 3 enters the sliding space 27, the notch on the oil ring 3 may not be directly aligned with the connecting block 26. At this point, due to the obstruction of the connecting block 26, the oil ring 3 cannot directly enter the sliding space 27. The damping tube 22 slides within the damping tube 22, but because the damping tube 22 always rotates around its own axis, the circumferential friction between the inner wall of the damping tube 22 and the outer ring wall of the oil ring 3 will drive the oil ring 3 to rotate relative to the damping block 25 until the notch on the oil ring 3 aligns with the connecting block 26. Only then can the oil ring 3 slide along the sliding space 27. Furthermore, when the oil ring 3 is locked in the damping tube 22, there is a limiting effect between the connecting block 26 and the notch on the oil ring 3, thereby further ensuring that the second section 29 of the damping tube 22 cannot continue to rotate when the oil ring 3 is locked.

[0030] In addition, the damping tube 22 can also make the impact force of each oil ring 3 when it falls onto the detection platform 10 more consistent. Since the oil ring 3 falls from the drop hole 19 during the rotation of the feeding turntable 4, if no guide component is provided, the oil ring 3 will fall obliquely downward with an initial tangential velocity under the action of rotational inertia after falling from the drop hole 19. Moreover, each oil ring 3 undergoes free fall after falling from the drop hole 19, and the distance between the drop hole 19 and the detection platform 10 is always equal. Therefore, the velocity increment of each oil ring 3 after falling from the drop hole 19 is almost the same. However, due to unavoidable factors, the velocity of each oil ring 3 after falling from the drop hole 19 is not consistent, which leads to different velocities of each oil ring 3 when it finally falls onto the detection platform 10, and the resulting impact force is also different. The cooperation between the damping tube 22 and the damping block 25 can standardize and correct the initial velocity of the oil ring 3 through frictional damping. After the oil ring 3 enters the sliding space 27, its initial velocity will be damped by the damping tube 22. The friction between the inner wall and the outer wall of the damping block 25 is quickly canceled out, thus ensuring that each oil ring 3 slides along the axial direction of the damping tube 22 almost only under the combined action of the axial component of the circumferential friction force generated between the contact surfaces of the two and the oil ring 3 and gravity. The magnitude of the axial friction force mentioned above mainly depends on the rotation speed of the second tube segment 29 in the damping tube 22. The rotation of the second tube segment 29 in the damping tube 22 is driven by the drive shaft of the rotating motor 6, so the rotation speed is relatively stable. At the same time, the oil rings 3 being tested are of the same specification and have almost the same weight. Therefore, the speed at which each oil ring 3 falls from the damping tube 21 tends to be consistent, avoiding errors in the detection results of the sound signal processor 15 due to the different impact forces of each oil ring 3 falling onto the detection platform 10.

[0031] In the embodiments described in this invention, only the oil ring 3 is used as an example for specific introduction. However, in actual production, the ring structure crack inspection device of this invention can perform crack inspection on ring structures with notches and high precision requirements, such as oil rings and piston rings. Furthermore, after simple improvements, those skilled in the art can also perform crack inspection on closed ring structures such as bearing outer rings.

[0032] The above are the preferred embodiments described in this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A crack detection device with a ring structure, characterized in that: The test box includes a test box (1), a feeding device (2), and an oil ring (3). The feeding device (2) is located above the test box (1), and several oil rings (3) are placed inside the feeding device (2). The test box (1) is equipped with a receiving device (8) and a sound signal processor (15). The top of the test box (1) is provided with a dropping hole (19) corresponding to the feeding device. The feeding device (2) can transfer the oil ring (3) to the top of the dropping hole (19), so that the oil ring (3) falls from the dropping hole (19) into the receiving device (8) in the test box (1). The sound signal processor (15) can collect the sound signal emitted when the oil ring (3) collides with the receiving device (8) at the moment the oil ring (3) falls onto the receiving device (8), and determine whether there is a crack in the oil ring (3) by the sound signal.

2. The crack detection device with an annular structure according to claim 1, characterized in that: The feeding device (2) includes a feeding turntable (4), a rotating motor (6), and a collecting cylinder (7). The feeding turntable (4) is rotatably mounted on the outer surface of the upper wall of the detection box (1), and a number of capturing holes (5) are arranged in a circular array on the feeding turntable (4). The rotating motor (6) is located on the side of the feeding turntable (4) away from the detection box (1), and the drive shaft of the rotating motor (6) is coaxially connected to the feeding turntable (4). The collecting cylinder (7) is fixedly mounted on the outer surface of the upper wall of the detection box by a bracket. In the assembled state, each capturing hole (5) on the feeding turntable (4) moves sequentially to the underside of the collecting cylinder (7) as the feeding turntable (4) rotates. When any one capturing hole (5) on the feeding turntable (4) rotates to the underside of the collecting cylinder (7), the other capturing hole (5) on the feeding turntable (4) is located directly above the dropping hole (19).

3. The crack detection device with an annular structure according to claim 1, characterized in that: The receiving device (8) includes a sliding inclined plane (9), a detection platform (10), and a pushing device (13). The detection platform (10) is fixedly installed in the detection box (1) by a mounting base (11), and the detection platform (10) is located directly below the material discharge hole (19). The sliding inclined plane (9) is inclinedly arranged on one side of the detection platform (10), and the higher end of the sliding inclined plane (9) is coplanar with the detection platform (10), while the lower end is fixedly connected to the inner surface of one side wall of the detection box (1). Next, the detection box (1) has a discharge port (16) on one side wall near the sliding inclined plane (9) corresponding to the lower end of the sliding inclined plane (9). The pushing device (13) is set on the other side of the detection platform (10) relative to the sliding inclined plane (9). The telescopic plate (14) of the pushing device (13) can push the oil ring (3) that falls on the detection platform (10) onto the sliding inclined plane (9). The oil ring (3) can slide along the sliding inclined plane (9) and slide out of the detection box (1) from the discharge port (16).

4. The crack detection device with an annular structure according to claim 1, characterized in that: It also includes a mounting plate (12), which is set to correspond to the detection platform (10). The mounting plate (12) is an "L" shaped plate, wherein one plate of the mounting plate (12) extends along the length direction of the detection box (1), and the other plate extends along the width direction of the detection box (1). In the assembled state, the mounting plate (12) forms a semi-enclosed state with the material receiving device (8) on the horizontal plane where it is installed. The sound signal processor (15) is fixed to the plate of the mounting plate (12) extending along the length direction of the detection box (1) corresponding to the detection platform (10). The pushing device (13) is fixed to the plate of the mounting plate (12) extending along the width direction of the detection box (1) corresponding to the detection platform (10).

5. The crack detection device with an annular structure according to claim 4, characterized in that: It also includes a guide assembly, which includes an isolation plate (17) and a guide tube (18). The isolation plate (17) is located above the detection platform (10), and a through drop hole (20) is provided on the isolation plate (17). One end of the guide tube (18) passes through the drop hole (20) coaxially on the side of the isolation plate (17) close to the detection platform (10). The guiding effect of the guide tube (18) enables the oil ring (3) to fall from the guide tube (18) to the detection platform (10) in a horizontal posture.

6. The crack detection device with an annular structure according to claim 5, characterized in that: The guide tube (18) includes a tapered tube (21) and a damping tube (22). The drive shaft of the rotating motor (6) passes through the upper wall of the detection box (1) and is inside the detection box (1). The drive shaft of the rotating motor (6) is coaxially fitted with a drive gear (23) at one end inside the detection box (1). A driven gear ring (24) that can mesh with the drive gear (23) is coaxially fitted on the outer wall of the tapered tube (21) with a larger diameter. The tapered tube (21) with a larger diameter is coaxially mounted on the inner side of the upper wall of the detection box (1). The damping tube (22) is coaxially mounted in the drop hole (20). One end of the damping tube (22) is coaxially connected to the tapered tube (21) with a smaller diameter. The other end passes through the drop hole (20) on the side of the isolation plate (17) near the detection platform (10).

7. The crack detection device with an annular structure according to claim 5, characterized in that: The damping tube (22) is provided with a cylindrical damping block (25) and a connecting block (26). The cross-section of the connecting block (26) is the same as the notch shape on the oil ring (3). The connecting block (26) is fixedly connected to the isolation plate (17). The connecting block (26) is in the drop hole (20) along the radial direction of the drop hole (20). The damping block (25) is fixed in the damping tube (22) coaxially through the connecting block (26). The radius of the damping block (25) is equal to the inner ring diameter of the oil ring (3). A sliding space (27) is formed between the damping block (25) and the inner wall of the damping tube (22). The oil ring (3) slides in the sliding space along the axial direction of the damping tube (22).

8. A crack detection device with an annular structure according to claim 5, characterized in that: The damping tube (22) is segmented, that is, the damping tube (22) includes a first tube segment (28) and a second tube segment (29). The first tube segment (28) is located on the side of the isolation plate (17) near the detection platform (10) and is fixedly connected to the isolation plate (17), and is coaxially arranged with the drop hole (20). The second tube segment (29) is located on the side of the isolation plate (17) away from the detection platform (10), and is coaxially integrally connected to the end of the tapered tube (21) with the smaller diameter. The end of the second tube segment (29) away from the tapered tube (21) is coaxially rotated and fitted in the drop hole (20).

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