Screw type air compressor rotor flaw detection device

Abstract

The invention discloses a screw type air compressor rotor flaw detection device, and relates to the technical field of air compressor rotor detection, the screw type air compressor rotor flaw detection device comprises a workbench, a rotating shaft and a plurality of spiral tooth surfaces arranged on the side wall of the rotating shaft, and further comprises a detection assembly arranged on the workbench and used for carrying out flaw detection on each spiral tooth surface, the flaw detection assembly comprises a detection ring connected to the two workbenches in a sliding mode, a plurality of detection pipes are connected to the side, close to the spiral tooth surfaces, of the detection ring in a sliding mode, and an ultrasonic flaw detection head is arranged at the end, close to the spiral tooth surfaces, of each mounting frame. According to the flaw detection device for the rotor of the screw-type air compressor, through the arrangement of the detection assembly, synchronous flaw detection testing on a plurality of spiral tooth surfaces is realized, and meanwhile, under the action of the control assembly, the ultrasonic flaw detection head moves on the surfaces of the spiral tooth surfaces in a path with the same distance with tooth roots; therefore, the conditions of the tooth surface and the interior can be reflected more accurately.

Description

Technical Field

[0001] This invention relates to the field of air compressor rotor testing technology, specifically to a screw air compressor rotor flaw detection device. Background Technology

[0002] In existing technologies, flaw detection and testing of screw air compressor rotors mainly employs magnetic particle testing or ultrasonic testing. Ultrasonic testing can detect extremely small defects inside the screw air compressor rotor, such as cracks, pores, and inclusions. Generally, it can detect defects at the millimeter level or even smaller, which is crucial for the early detection of potential safety hazards in the rotor. At the same time, the propagation time and reflection position of ultrasonic waves in the rotor can accurately determine the location, depth, and size of defects. This helps maintenance personnel accurately assess the condition of defects and provides a reliable basis for subsequent repair or replacement work.

[0003] In the process of ultrasonic flaw detection of screw air compressor rotor, the surface of the screw air compressor rotor is first uniformly coated with a coupling agent. Then, an ultrasonic probe is moved on the surface of the screw air compressor rotor. When the ultrasonic wave propagates inside the rotor, the echo signal generated when the ultrasonic wave encounters a defect is received by the probe, converted into an electrical signal and transmitted to the computer. The computer analyzes and processes the signal and displays the defect location and depth information on the display screen.

[0004] The overall shape of a screw air compressor rotor is a multi-headed helical curved surface, which is complex. During the ultrasonic testing of the helical tooth surface of the screw air compressor rotor, the movement control of the ultrasonic probe is difficult due to parameters such as the screw pitch and helix angle. In actual movement, it is difficult to control the distance between the ultrasonic probe and the tooth root. The unstable distance will cause the ultrasonic waves to be reflected and refracted on the tooth surface in a complex and variable manner, generating messy reflected waves that interfere with the normal defect signals. This makes the waveform displayed by the flaw detector difficult to interpret, affecting the identification and judgment of small defects on the tooth surface, thus increasing the error of the screw air compressor rotor test results. To address this, we propose a flaw detection device for screw air compressor rotors. Summary of the Invention

[0005] The purpose of this invention is to provide a screw air compressor rotor flaw detection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a screw air compressor rotor flaw detection device, comprising a worktable, a rotating shaft, and multiple helical tooth surfaces disposed on the side wall of the rotating shaft. The worktable is provided with two center tailstocks for positioning the rotating shaft, and also includes a detection component disposed on the worktable for flaw detection of each helical tooth surface.

[0007] The flaw detection assembly includes a detection ring slidably connected to two workbenches. The detection ring is concentrically arranged with the rotation shaft. Multiple detection tubes are slidably connected to the side of the detection ring near each helical tooth surface. The detection ring is provided with an adjustment component for adjusting the height of each detection tube. Each detection tube has a mounting frame at the end near the helical tooth surface. Each mounting frame has an ultrasonic flaw detector head at the end near the helical tooth surface. Each detection tube has a control component for controlling the flaw detection path of the ultrasonic flaw detector head. Each detection tube is connected to an ultrasonic flaw detector via a strip support plate at the end away from the helical tooth surface. Each ultrasonic flaw detector head is electrically connected to the ultrasonic flaw detector via connecting wires. Each connecting wire passes through the detection tube. The workbenches are provided with a moving component for moving each ultrasonic flaw detector head on the surface of the helical tooth surface.

[0008] Preferably, the control assembly includes two symmetrically arranged control plates slidably connected to one end of the detection tube near the ultrasonic flaw detector head. A control rod is fixedly connected to the side of the two control plates that is far apart from each other. One of the two control plates is provided with an adjustment assembly for adjusting the flaw detection angle of the ultrasonic flaw detector head. The detection tube is provided with a drive assembly for driving the two control plates.

[0009] Preferably, the ends of the two control levers that are far apart from each other are provided with protective pads, and the two protective pads are made of a material with a hardness less than that of the helical tooth surface.

[0010] Preferably, the driving assembly includes two symmetrically arranged driving rods fixedly connected to the inner wall of the detection tube, two control plates slidably connected to the driving rods, a double-ended threaded rod rotatably connected between the two driving rods, the two ends of the double-ended threaded rod being rotatably connected to the inner wall of the detection tube, and the two control plates being threadedly connected to two threaded strips with different directions of rotation on the side wall of the double-ended threaded rod.

[0011] Preferably, a mounting base plate is fixedly connected to the side wall of the detection tube, and a first motor is fixedly connected to the side of the mounting base plate away from the detection tube. The output end of the first motor is connected to a double-threaded rod.

[0012] Preferably, the adjustment assembly includes a strip plate disposed on the side of the control board near the ultrasonic flaw detector head, one end of the strip plate being connected to the mounting frame, and a second motor being fixedly connected to the side of the control board near the ultrasonic flaw detector head, the output end of the second motor being connected to the strip plate.

[0013] Preferably, the adjustment assembly includes adjustment holes opened on the side of the detection ring near each detection tube, each adjustment hole is slidably connected to an adjustment plate, the end of each adjustment plate away from the bottom wall of the adjustment hole is respectively connected to each detection tube, a rotating threaded rod is rotatably connected between the two opposite inner walls of each adjustment hole, each adjustment plate is threadedly connected to the rotating threaded rod, and the detection ring is provided with a rotation assembly for synchronously rotating each rotating threaded rod.

[0014] Preferably, the rotating assembly includes a rotating ring rotatably connected to the side wall of the detection ring. A plurality of arc-shaped gear rings are fixedly connected to the side of the rotating ring near the rotating threaded rod. A connecting rod is fixedly connected to the end of each rotating threaded rod near the rotating ring. The end of each connecting rod away from the rotating threaded rod passes through the detection ring and is fixedly connected to a gear. Each gear meshes with each arc-shaped gear ring.

[0015] Preferably, an L-shaped plate is fixedly connected to the side of the detection ring near the rotating ring, and a third motor is fixedly connected to the side of the L-shaped plate away from the detection ring. The output end of the third motor is connected to the rotating threaded rod.

[0016] Preferably, the moving assembly includes two symmetrically arranged fixed plates fixedly connected to the worktable near the center tailstock. A guide rod is fixedly connected between the two fixed plates, and a first moving plate is slidably connected between the two guide rods. One end of the two first moving plates is connected to a detection ring. A lead screw is rotatably connected between the two fixed plates. The lead screw is located between the two guide rods and has a second moving plate threaded to its side wall. One end of the second moving plate is connected to the detection ring. A fourth motor is fixedly connected to one of the two fixed plates on the side away from the second moving plate, and the output end of the fourth motor is connected to the lead screw.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The screw air compressor rotor flaw detection device of the present invention, through the setting of the detection components, realizes simultaneous flaw detection and testing of multiple helical tooth surfaces by using multiple ultrasonic flaw detectors and ultrasonic flaw detection heads. Under the cooperation of the control components, drive components and adjustment components, the ultrasonic flaw detection head moves on the surface of the helical tooth surface along a path equal to the tooth root distance, thereby ensuring that the ultrasonic beam is incident on the tooth surface and interior at a relatively fixed angle and path. This helps to reduce the uncertainty of sound beam refraction, scattering and attenuation, making the propagation of ultrasonic waves in the helical tooth surface more stable, thus more accurately reflecting the condition of the tooth surface and interior, improving the identification and judgment of small defects on the tooth surface, and thus improving the accuracy of flaw detection of screw air compressor rotors.

[0019] 2. The screw air compressor rotor flaw detection device of the present invention adjusts the component settings so that the ultrasonic flaw detection head is aligned with the normal direction of the helical tooth surface, thereby enabling the ultrasonic beam to be incident more perpendicularly on the surface and interior of the helical tooth surface, reducing the refraction and scattering of the sound beam caused by angular deviation, making the propagation path of the ultrasonic wave in the helical tooth surface more stable and predictable, thereby improving the accuracy of defect location detection and testing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation structure of the detection mechanism and the helical tooth surface of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the detection mechanism, control mechanism, and drive mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the adjusting component and the rotating component of the present invention;

[0024] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 6 for Figure 4 Enlarged view at point B in the middle;

[0026] Figure 7 for Figure 5 Enlarged view at point C;

[0027] Figure 8 This is a schematic diagram showing the positional structure of the two control rods and the helical tooth surface of the present invention;

[0028] Figure 9 This is a schematic diagram of the two control levers at different positions on the helical tooth surface of the present invention;

[0029] Figure 10 This is a schematic diagram illustrating the control of the distance between the ultrasonic probe and the root of the helical tooth surface according to the present invention.

[0030] In the diagram: 101, worktable; 102, rotating shaft; 103, helical tooth surface; 104, center tailstock; 201, detection ring; 202, detection tube; 203, mounting frame; 204, ultrasonic flaw detector head; 205, ultrasonic flaw detector; 206, connecting wire; 301, control board; 302, control rod; 401, drive rod; 402, double-ended threaded rod; 403, first motor; 404, mounting base plate; 501, Strip plate; 502, Second motor; 601, Adjusting hole; 602, Adjusting plate; 603, Rotating threaded rod; 701, Rotating ring; 702, Arc-shaped gear ring; 703, Gear; 704, L-shaped plate; 705, Third motor; 706, Connecting rod; 801, Fixing plate; 802, Guide rod; 803, First moving plate; 804, Second moving plate; 805, Lead screw; 806, Fourth motor. Detailed Implementation

[0031] 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 scope of protection of the present invention.

[0032] Example 1

[0033] Please see Figures 1-10 The screw air compressor rotor flaw detection device shown in the figure includes a worktable 101, a rotating shaft 102, and a plurality of helical tooth surfaces 103 disposed on the side wall of the rotating shaft 102. The worktable 101 is provided with two center tailstocks 104 for positioning the rotating shaft 102, and also includes a detection component disposed on the worktable 101 for flaw detection of each helical tooth surface 103.

[0034] The flaw detection assembly includes a detection ring 201 slidably connected to two worktables 101. The detection ring 201 is concentrically arranged with the rotating shaft 102. Multiple detection tubes 202 are slidably connected to the side of the detection ring 201 near each helical tooth surface 103. The detection ring 201 is equipped with an adjustment assembly for adjusting the height of each detection tube 202. Each detection tube 202 has a mounting frame 203 at one end near the helical tooth surface 103, and each mounting frame 203 has an ultrasonic flaw detection head 204 at one end near the helical tooth surface 103. Each detection tube 202 is equipped with a control component for controlling the detection path of the ultrasonic flaw detector head 204. The end of each detection tube 202 away from the helical tooth surface 103 is connected to an ultrasonic flaw detector 205 through a strip support plate. Each ultrasonic flaw detector head 204 is electrically connected to the ultrasonic flaw detector 205 through a connecting wire 206. Each connecting wire 206 passes through the detection tube 202. The workbench 101 is equipped with a moving component for moving each ultrasonic flaw detector head 204 on the surface of the helical tooth surface 103.

[0035] It should be noted that, through the configuration of the detection components, multiple ultrasonic flaw detectors 205 and ultrasonic flaw detection heads 204 are used to simultaneously detect flaws on multiple helical tooth surfaces 103. Simultaneously, with the coordinated action of the control, drive, adjustment, and regulating components, the ultrasonic flaw detection head 204 moves along a path equal to the tooth root distance on the surface of the helical tooth surface 103. This ensures that the ultrasonic beam is incident on the tooth surface and interior at a relatively fixed angle and path, thus helping to reduce the uncertainty of sound beam refraction, scattering, and attenuation. This makes the propagation of ultrasonic waves in the helical tooth surface 103 more stable, thereby more accurately reflecting the condition of the tooth surface and interior, improving the identification and judgment of minor defects on the tooth surface, and ultimately improving the accuracy of flaw detection on the screw air compressor rotor.

[0036] It is worth noting that the ultrasonic flaw detector 205 mainly consists of a transmitting circuit, a receiving circuit, an ultrasonic flaw detector head 204, a time base circuit, a display circuit, and a power supply circuit. In actual use, the ultrasonic flaw detector head 204 emits ultrasonic waves towards the surface of the helical tooth surface 103. The ultrasonic waves propagate towards the surface of the helical tooth surface 103 at a certain frequency and direction. When the ultrasonic waves encounter the surface of the helical tooth surface 103, due to the difference in acoustic impedance between the tooth surface and the surrounding medium (such as air), part of the ultrasonic waves are reflected back at the interface between the tooth surface and the medium, forming interface reflection waves. The other part of the ultrasonic waves will enter the interior of the tooth surface and continue to propagate. If there are defects inside the tooth surface, such as cracks or pores, due to the difference in acoustic impedance between the defect and the surrounding material, the ultrasonic waves will be reflected, refracted, and scattered again when they encounter the defect. Among these, the reflected waves will propagate towards the ultrasonic flaw detector head 204. After receiving the reflected ultrasonic waves, the wave probe 204 converts them into electrical signals. The receiving circuit amplifies and filters these weak electrical signals to remove interference signals and improve signal quality. The time base circuit determines the position information corresponding to the reflected signal based on the propagation time of the ultrasonic waves. The processed signal is displayed on the screen as a waveform or image through the display circuit. The operator can judge whether there are defects on the helical tooth surface 103, as well as the location, size, and nature of the defects, based on the waveform characteristics displayed, such as amplitude, wave shape, and position. For example, the waveform of a normal tooth surface is relatively regular, with only characteristic signals such as interface reflection waves. If there are defects, additional abnormal signals such as peaks or troughs will appear on the waveform. Based on the position and amplitude of these abnormal signals, the specific situation of the defect can be analyzed. As this is existing technology, it will not be elaborated further here.

[0037] Please see Figure 5 and Figure 7 The control assembly shown in the figure includes two symmetrically arranged control plates 301 that are slidably connected to one end of the detection tube 202 near the ultrasonic flaw detector head 204. A control rod 302 is fixedly connected to the side of the two control plates 301 that is far apart from each other. One of the two control plates 301 is provided with an adjustment assembly for adjusting the flaw detection angle of the ultrasonic flaw detector head 204. The detection tube 202 is provided with a drive assembly for driving the two control plates 301.

[0038] It should be noted that by setting the control components, the ultrasonic flaw detector head 204 moves on the surface of the helical tooth surface 103 along a path equal to the tooth root distance. This ensures that the ultrasonic beam is incident on the tooth surface and interior at a relatively fixed angle and path, thereby helping to reduce the uncertainty of sound beam refraction, scattering, and attenuation. This makes the propagation of ultrasonic waves in the helical tooth surface 103 more stable, thus more accurately reflecting the condition of the tooth surface and interior, improving the identification and judgment of minor defects on the tooth surface, and thus improving the accuracy of flaw detection of screw air compressor rotors.

[0039] Please see Figure 5 and Figure 7 The two control levers 302 in the figure are provided with protective pads at their far ends. The two protective pads are made of rubber or a material with a hardness less than that of the helical tooth surface 103.

[0040] It should be noted that by setting a protective pad on the side of the control lever 302 near the helical tooth surface 103, scratches on the helical tooth surface 103 can be avoided when the control lever 302 slides on the surface of the helical tooth surface 103.

[0041] Please see Figure 5 and Figure 7 The driving assembly shown in the figure includes two symmetrically arranged driving rods 401 fixedly connected to the inner wall of the detection tube 202, two control plates 301 slidably connected to the driving rods 401, and a double-threaded rod 402 rotatably connected between the two driving rods 401. The two ends of the double-threaded rod 402 are respectively rotatably connected to the inner wall of the detection tube 202, and the two control plates 301 are respectively threaded to two threaded strips with different directions of rotation on the side wall of the double-threaded rod 402.

[0042] It should be noted here that the drive assembly allows the two opposing control plates 301 to move closer or further apart, thereby adjusting the distance between the two opposing control rods 302. This allows for adjustment of the depth to which the two control rods 302 are inserted between adjacent helical tooth surfaces 103, thus achieving adjustment of the distance between the ultrasonic flaw detector head 204 and the root of the tooth surface (see reference). Figure 8 and Figure 9 This adapts to different testing needs and improves the flexibility of flaw detection on the spiral tooth surface 103.

[0043] Please see Figure 5 and Figure 7 The detection tube 202 in the figure is fixedly connected to the side wall of the mounting base 404. The side of the mounting base 404 away from the detection tube 202 is fixedly connected to the first motor 403. The output end of the first motor 403 is connected to the double-threaded rod 402.

[0044] It should be noted here that the first motor 403 is designed to facilitate the rotation of the double-ended threaded rod 402.

[0045] Please see Figure 5 and Figure 7The adjustment components shown in the figure include a strip plate 501 disposed on the side of the control plate 301 near the ultrasonic flaw detector head 204. One end of the strip plate 501 is connected to the mounting frame 203. A second motor 502 is fixedly connected to the side of the control plate 301 near the ultrasonic flaw detector head 204. The output end of the second motor 502 is connected to the strip plate 501.

[0046] It should be noted here that by adjusting the component settings, the ultrasonic flaw detector head 204 is aligned with the normal of the helical tooth surface 103, thereby allowing the ultrasonic beam to be incident more perpendicularly on the surface and interior of the helical tooth surface 103. This reduces the refraction and scattering of the sound beam caused by angular deviation, making the propagation path of the ultrasonic wave in the helical tooth surface 103 more stable and predictable, thus improving the accuracy of defect location detection.

[0047] Please see Figure 4 and Figure 6 The adjustment assembly shown in the figure includes adjustment holes 601 opened on the side of the detection ring 201 near each detection tube 202, adjustment plates 602 slidably connected to each adjustment hole 601, and the end of each adjustment plate 602 away from the bottom wall of the adjustment hole 601 is respectively connected to each detection tube 202. Rotary threaded rods 603 are rotatably connected between the two opposite inner walls of each adjustment hole 601, and each adjustment plate 602 is threadedly connected to the rotating threaded rods 603. The detection ring 201 is provided with a rotation assembly for synchronously rotating each rotating threaded rod 603.

[0048] It should be noted here that the settings of the components are adjusted to move each detection tube 202 closer to or further away from the helical tooth surface 103.

[0049] Please see Figure 4 and Figure 6 The rotating assembly shown in the figure includes a rotating ring 701 rotatably connected to the side wall of the detection ring 201. A plurality of arc-shaped gear rings 702 are fixedly connected to the side of the rotating ring 701 near the rotating threaded rod 603. A connecting rod 706 is fixedly connected to one end of each rotating threaded rod 603 near the rotating ring 701. The end of each connecting rod 706 away from the rotating threaded rod 603 passes through the detection ring 201 and is fixedly connected to a gear 703. Each gear 703 is respectively meshed with each arc-shaped gear ring 702.

[0050] It should be noted that the rotating component facilitates the synchronous rotation of each rotating threaded rod 603, thereby achieving synchronous adjustment of each detection tube 202.

[0051] Please see Figure 4 and Figure 6In the figure, an L-shaped plate 704 is fixedly connected to the side of the detection ring 201 near the rotating ring 701, and a third motor 705 is fixedly connected to the side of the L-shaped plate 704 away from the detection ring 201. The output end of the third motor 705 is connected to the rotating threaded rod 603.

[0052] It should be noted here that the third motor 705 is designed to facilitate the rotation of one of the gears 703.

[0053] Please see Figure 1 The movable component shown in the figure includes two symmetrically arranged fixed plates 801 fixedly connected to the worktable 101 near the center tailstock 104. A guide rod 802 is fixedly connected between the two fixed plates 801. A first movable plate 803 is slidably connected between the two guide rods 802. One end of the two first movable plates 803 is connected to the detection ring 201. A lead screw 805 is rotatably connected between the two fixed plates 801. The lead screw 805 is located between the two guide rods 802 and has a second movable plate 804 threadedly connected to its side wall. One end of the second movable plate 804 is connected to the detection ring 201. A fourth motor 806 is fixedly connected to one of the two fixed plates 801 on the side away from the second movable plate 804. The output end of the fourth motor 806 is connected to the lead screw 805.

[0054] It should be noted that the movable component facilitates the movement of the detection ring 201, which in turn moves each ultrasonic flaw detector head 204 on the surface of the helical tooth surface 103.

[0055] This solution includes a screw air compressor rotor flaw detection device, comprising the following steps:

[0056] When performing flaw detection on the rotor of a screw air compressor, the rotating shaft 102 is first placed between two center tailstocks 104. Then, the two centers are used to press against both ends of the rotating shaft 102, thereby ensuring the position of the rotating shaft 102 and maintaining its rotational characteristics. After the position of the rotating shaft 102 is defined, the position of multiple helical tooth surfaces 103 is also defined.

[0057] After defining the position of each helical tooth surface 103, a coupling agent can be evenly applied to the surface of each helical tooth surface 103. After the coupling agent is applied, the fourth motor 806 (model RS-775PH-8011R, which is existing technology and will not be described in detail here) can be started, thereby driving the lead screw 805 to rotate. During the rotation of the lead screw 805, the thread meshing transmission between the lead screw 805 and the second moving plate 804 and the guiding action between the two guide rods 802 and the first moving plate 803 will drive the detection ring 201 to move closer to the helical tooth surface 103. During the movement of the detection ring 201 closer to the helical tooth surface 103, each detection tube 202 will be driven to move closer to the helical tooth surface 103 simultaneously.

[0058] When each detection tube 202 moves above the helical tooth surface 103, the fourth motor 806 is stopped and the third motor 705 (model RS-770PHF-8523R, which is existing technology and will not be described in detail here) is started, which drives the gear 703 at one end of the connecting rod 706 to rotate. During the rotation of the gear 703, the meshing transmission between the gear 703 and the arc-shaped gear ring 702 on the side wall of the rotating ring 701 drives each rotating threaded rod 603 to rotate synchronously. Then, under the thread meshing transmission between each rotating threaded rod 603 and the adjusting plate 602, each detection tube 202 is driven to move closer to the helical tooth surface 103.

[0059] As each detection tube 202 moves closer to the helical tooth surface 103, when each detection tube 202 is inserted into the groove between two adjacent helical tooth surfaces 103 (see reference). Figure 8 and Figure 9 This will cause the two control rods 302 to be inserted into the tooth groove between the two adjacent spiral tooth surfaces 103 simultaneously. As the detection tube 202 moves down, when the two control rods 302 abut against the side walls of the two adjacent spiral tooth surfaces 103 respectively, the downward movement of the detection tube 202 will stop.

[0060] When the two control levers 302 abut against the sidewalls of the two adjacent helical tooth surfaces 103, the ultrasonic flaw detector 204 that can penetrate one end of the mounting frame 203 is aligned with the normal of the helical tooth surface 103. If the ultrasonic flaw detector 204 is not aligned with the normal of the helical tooth surface 103, the second motor 502 (model RS-550PH-4559RD, which is existing technology and will not be described in detail here) can be started to drive the strip plate 501 to rotate, thereby driving the ultrasonic flaw detector 204 on one side of the mounting frame 203 to rotate, so that the ultrasonic flaw detector 204 is aligned with the normal of the helical tooth surface 103. This allows the ultrasonic beam to be incident more perpendicularly on the surface and interior of the helical tooth surface 103, reducing the refraction and scattering of the sound beam caused by the angle deviation, making the propagation path of the ultrasonic wave in the helical tooth surface 103 more stable and predictable, thereby improving the accuracy of defect location detection.

[0061] After the angle of the ultrasonic flaw detector head 204 is adjusted, the moving component can be used to move the detection ring 201 again. During the movement of the detection ring 201, the two control rods 302 will move synchronously. During the movement of the two control rods 302, the interaction force between the two control rods 302 and the two adjacent helical tooth surfaces 103 will be used to drive the helical tooth surfaces 103 to rotate. As a result, the helical tooth surfaces 103 will rotate accordingly during the lateral movement of the detection tube 202, so as not to interfere with the movement of the ultrasonic flaw detector head 204.

[0062] Furthermore, during the movement of the two control levers 302 on the surfaces of two adjacent helical tooth surfaces 103, the ultrasonic flaw detector head 204 moves along a path equal to the tooth root distance on the surface of the helical tooth surface 103 due to the mutual resistance between the two control levers 302 and the two adjacent helical tooth surfaces 103. During this movement, the ultrasonic flaw detector head 204 emits ultrasonic waves onto the surface of the helical tooth surface 103. The ultrasonic waves propagate towards the surface of the helical tooth surface 103 at a certain frequency and direction. When the ultrasonic waves encounter the surface of the helical tooth surface 103, due to the difference in acoustic impedance between the tooth surface and the surrounding medium (such as air), part of the ultrasonic waves are reflected back at the interface between the tooth surface and the medium, forming an interface reflection wave. The other part of the ultrasonic waves will enter the interior of the tooth surface and continue to propagate. If there are defects inside the tooth surface, such as cracks or pores, due to the difference in acoustic impedance between the defects and the surrounding material, the ultrasonic waves will re-emerge upon encountering the defects. The ultrasonic wave is reflected, refracted, and scattered. The reflected wave propagates towards the ultrasonic flaw detector head 204. After receiving the reflected ultrasonic wave, the ultrasonic flaw detector head 204 converts it into an electrical signal. The receiving circuit amplifies and filters these weak electrical signals to remove interference signals and improve signal quality. The time base circuit determines the position information corresponding to the reflected signal based on the propagation time of the ultrasonic wave. The processed signal is displayed on the screen in the form of a waveform or image through the display circuit. The operator can judge whether there is a defect in the helical tooth surface 103, as well as the location, size, and nature of the defect, based on the waveform characteristics displayed, such as amplitude, wave shape, and position. For example, the waveform of a normal tooth surface is relatively regular and only has characteristic signals such as interface reflection waves. If there is a defect, additional abnormal signals such as peaks or troughs will appear on the waveform. Based on the position and amplitude of these abnormal signals, the specific situation of the defect can be analyzed.

[0063] During the movement of the ultrasonic flaw detector head 204, the two control rods 302, through their interaction with the adjacent two helical tooth surfaces 103, allow the ultrasonic flaw detector head 204 to move along a path equal to the tooth root distance on the surface of the helical tooth surface 103. This ensures that the ultrasonic beam is incident on the tooth surface and interior at a relatively fixed angle and path, thereby helping to reduce the uncertainty of sound beam refraction, scattering, and attenuation, making the propagation of ultrasonic waves in the helical tooth surface 103 more stable, thus more accurately reflecting the condition of the tooth surface and interior, improving the identification and judgment of minute defects on the tooth surface, and thus improving the accuracy of flaw detection of screw air compressor rotors.

[0064] Furthermore, when adjusting the distance between the ultrasonic flaw detector head 204 and the root of the helical tooth surface 103, the first motor 403 (model RS-550PHF-6537GY, existing technology, will not be elaborated upon here) can be started to drive the double-ended threaded rod 402 to rotate. Then, under the threaded engagement transmission between the double-ended threaded rod 402 and the two control plates 301, and the guiding action of the drive rod 401, the two control plates 301 are driven to move away from or towards each other, thereby driving the two control rods 302 to move away from or towards each other. This adjusts the distance between the two opposing control rods 302, allowing for adjustment of the depth to which the two control rods 302 are inserted between adjacent helical tooth surfaces 103, thus achieving the adjustment of the distance between the ultrasonic flaw detector head 204 and the root of the tooth surface (see reference). Figure 8 and Figure 9 This adapts to different testing needs and improves the flexibility of flaw detection on the spiral tooth surface 103.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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.

[0066] 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 flaw detection device for a screw air compressor rotor, comprising: The worktable (101), the rotating shaft (102), and a plurality of helical tooth surfaces (103) provided on the side wall of the rotating shaft (102) are provided. The worktable (101) is provided with two center tailstocks (104) for positioning the rotating shaft (102). Its characteristic is that it further includes: A detection component installed on the workbench (101) for performing flaw detection on each helical tooth surface (103); The flaw detection assembly includes a detection ring (201) slidably connected to two worktables (101). The detection ring (201) is concentrically arranged with the rotating shaft (102). Multiple detection tubes (202) are slidably connected to the side of the detection ring (201) near each helical tooth surface (103). The detection ring (201) is provided with an adjustment assembly for adjusting the height of each detection tube (202). Each detection tube (202) has a mounting frame (203) at one end near the helical tooth surface (103), and each mounting frame (203) has an ultrasonic flaw detection head (204) at one end near the helical tooth surface (103). Each of the detection tubes (202) is provided with a control component for controlling the detection path of the ultrasonic flaw detector head (204). The end of each detection tube (202) away from the helical tooth surface (103) is connected to an ultrasonic flaw detector (205) through a strip support plate. Each of the ultrasonic flaw detector heads (204) is electrically connected to the ultrasonic flaw detector (205) through a connecting wire (206). Each of the connecting wires (206) is set through the detection tube (202). The workbench (101) is provided with a moving component for driving each ultrasonic flaw detector head (204) to move on the surface of the helical tooth surface (103). The control component includes an adjustment component for adjusting the inspection angle of the ultrasonic flaw detector head (204). By setting the adjustment component, the ultrasonic flaw detector head (204) is aligned with the normal direction of the helical tooth surface (103).

2. The screw air compressor rotor flaw detection device according to claim 1, characterized in that: The control assembly includes two symmetrically arranged control plates (301) slidably connected to one end of the detection tube (202) near the ultrasonic flaw detector head (204). A control rod (302) is fixedly connected to the side of the two control plates (301) that is far apart from each other. One of the two control plates (301) is provided with an adjustment assembly for adjusting the flaw detection angle of the ultrasonic flaw detector head (204). The detection tube (202) is provided with a drive assembly for driving the two control plates (301).

3. The screw air compressor rotor flaw detection device according to claim 2, characterized in that: The two control levers (302) are provided with protective pads at their ends that are far apart from each other. The two protective pads are made of a material with a hardness less than that of the helical tooth surface (103).

4. The screw air compressor rotor flaw detection device according to claim 3, characterized in that: The drive assembly includes two symmetrically arranged drive rods (401) fixedly connected to the inner wall of the detection tube (202), two control plates (301) slidably connected to the drive rods (401), and a double-threaded rod (402) rotatably connected between the two drive rods (401). The two ends of the double-threaded rod (402) are respectively rotatably connected to the inner wall of the detection tube (202), and the two control plates (301) are respectively threaded to two threaded bars with different directions of rotation on the side wall of the double-threaded rod (402).

5. The screw air compressor rotor flaw detection device according to claim 4, characterized in that: The detection tube (202) is fixedly connected to a mounting base plate (404) on its side wall. A first motor (403) is fixedly connected to the side of the mounting base plate (404) away from the detection tube (202). The output end of the first motor (403) is connected to the double-ended threaded rod (402).

6. The screw air compressor rotor flaw detection device according to claim 5, characterized in that: The adjustment assembly includes a strip plate (501) disposed on the side of the control plate (301) near the ultrasonic flaw detector head (204). One end of the strip plate (501) is connected to the mounting frame (203). A second motor (502) is fixedly connected to the side of the control plate (301) near the ultrasonic flaw detector head (204). The output end of the second motor (502) is connected to the strip plate (501).

7. The screw air compressor rotor flaw detection device according to claim 6, characterized in that: The adjustment assembly includes adjustment holes (601) on the side of the detection ring (201) near each detection tube (202), each adjustment hole (601) is slidably connected to an adjustment plate (602), one end of each adjustment plate (602) away from the bottom wall of the adjustment hole (601) is respectively connected to each detection tube (202), a rotating threaded rod (603) is rotatably connected between the two opposite inner walls of each adjustment hole (601), each adjustment plate (602) is threadedly connected to the rotating threaded rod (603), and the detection ring (201) is provided with a rotation assembly for synchronously rotating each rotating threaded rod (603).

8. The screw air compressor rotor flaw detection device according to claim 7, characterized in that: The rotating assembly includes a rotating ring (701) rotatably connected to the side wall of the detection ring (201). A plurality of arc-shaped gear rings (702) are fixedly connected to the side of the rotating ring (701) near the rotating threaded rod (603). A connecting rod (706) is fixedly connected to one end of each rotating threaded rod (603) near the rotating ring (701). The end of each connecting rod (706) away from the rotating threaded rod (603) passes through the detection ring (201) and is fixedly connected to a gear (703). Each gear (703) meshes with each arc-shaped gear ring (702).

9. The screw air compressor rotor flaw detection device according to claim 8, characterized in that: An L-shaped plate (704) is fixedly connected to the side of the detection ring (201) near the rotating ring (701), and a third motor (705) is fixedly connected to the side of the L-shaped plate (704) away from the detection ring (201). The output end of the third motor (705) is connected to the rotating threaded rod (603).

10. A screw air compressor rotor flaw detection device according to claim 9, characterized in that: The moving assembly includes two symmetrically arranged fixed plates (801) fixedly connected to the worktable (101) near the center tailstock (104). A guide rod (802) is fixedly connected between the two fixed plates (801). A first moving plate (803) is slidably connected between the two guide rods (802). One end of the two first moving plates (803) is connected to a detection ring (201). A lead screw (805) is rotatably connected between the two fixed plates (801). The lead screw (805) is located between the two guide rods (802) and has a second moving plate (804) threaded to its side wall. One end of the second moving plate (804) is connected to the detection ring (201). A fourth motor (806) is fixedly connected to one of the two fixed plates (801) on the side away from the second moving plate (804). The output end of the fourth motor (806) is connected to the lead screw (805).

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