A screw air compressor rotor flaw detection device

Abstract

The application discloses a screw air compressor rotor flaw detection device, and relates to the technical field of air compressor rotor detection. The screw air compressor rotor flaw detection device comprises a workbench, a rotating shaft and a plurality of helical tooth surfaces arranged on the side wall of the rotating shaft, and further comprises a detection assembly arranged on the workbench and used for detecting the flaws of the helical tooth surfaces. The detection assembly comprises a detection ring slidingly connected to the two workbenches. A plurality of detection tubes are slidingly connected to one side of the detection ring close to the helical tooth surfaces. One end of each mounting frame close to the helical tooth surface is provided with an ultrasonic flaw detection head. The screw air compressor rotor flaw detection device can realize synchronous flaw detection of the plurality of helical tooth surfaces. Under the action of the control assembly, the ultrasonic flaw detection head moves on the surface of the helical tooth surface at a path equal to the tooth root spacing, so that the conditions of the tooth surface and the interior are more accurately reflected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressor rotor detection testing, in particular to a screw air compressor rotor flaw detection device. BACKGROUND

[0002] In the prior art, screw air compressor rotor flaw detection testing is mainly carried out through magnetic particle flaw detection or ultrasonic flaw detection. The ultrasonic flaw detection can detect extremely small defects inside the screw air compressor rotor, such as cracks, pores and inclusions. Generally, it can detect defects of millimeter level or even smaller size, which is very crucial for early detection of potential safety hazards of the rotor. Meanwhile, the propagation time and reflection position of ultrasonic waves in the rotor can accurately determine the position, depth and size of the defects, which helps maintenance personnel accurately judge the defect condition and provide reliable basis for subsequent repair or replacement work.

[0003] In the process of ultrasonic flaw detection of the screw air compressor rotor, the surface of the screw air compressor rotor is uniformly coated with a coupling agent, and then the 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 and converted into an electrical signal which is transmitted to the computer. The computer analyzes and processes the signal and displays the defect position and depth information on the display screen.

[0004] The overall shape of the screw air compressor rotor is a multi-start helical surface, which is complex. In the process of detecting the helical tooth surface of the screw air compressor rotor using ultrasonic waves, the movement control of the ultrasonic probe is difficult due to the existence of parameters such as screw pitch and helix angle. In the actual movement process, it is difficult to control the distance between the ultrasonic probe and the tooth root, and unstable distance will make the ultrasonic wave reflection and refraction on the tooth surface complex and changeable, producing chaotic reflection waves, interfering with the normal defect signal, making it difficult to interpret the waveform displayed by the flaw detector, affecting the identification and judgment of the tiny defects on the tooth surface, and thus increasing the error of the detection result of the screw air compressor rotor. Therefore, we propose a screw air compressor rotor flaw detection device. SUMMARY

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

[0006] To achieve the above purpose, the present application provides the following technical solution: a screw air compressor rotor flaw detection device, comprising a workbench, a rotating shaft and a plurality of helical tooth surfaces arranged on the side wall of the rotating shaft, the workbench is provided with two tailstock centers for positioning the rotating shaft, and further comprising a detection assembly arranged on the workbench for flaw detection of each helical tooth surface.

[0007] The detection assembly includes a detection ring slidably connected to two worktables. 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 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. 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 is electrically connected to the ultrasonic flaw detector via connecting wires. Each connecting wire passes through the detection tube. The worktable is provided with a moving component for moving each ultrasonic flaw detector 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 adjusting assembly comprises adjusting holes opened on the detection ring near each detection pipe, each adjusting hole is slidably connected with an adjusting plate, one end of each adjusting plate away from the bottom wall of the adjusting hole is connected with each detection pipe respectively, two inner walls of each adjusting hole are rotatably connected with a rotating threaded rod, each adjusting plate is threadedly connected with the rotating threaded rod, and the detection ring is provided with a rotating assembly for synchronously rotating each rotating threaded rod.

[0014] Preferably, the rotating assembly comprises a rotating ring rotatably connected with the side wall of the detection ring, a plurality of arc-shaped gear rings are fixedly connected with the side of the rotating ring near the rotating threaded rod, a connecting rod is fixedly connected with one end of each rotating threaded rod near the rotating ring, each connecting rod penetrates through the detection ring and is fixedly connected with a gear at an end away from the rotating threaded rod, and each gear is meshed with each arc-shaped gear ring respectively.

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

[0016] Preferably, the moving assembly comprises two symmetrically arranged fixed plates fixedly connected with the side of the workbench near the tailstock center, guide rods are fixedly connected between the two fixed plates, first moving plates are slidably connected with the two guide rods, one end of each first moving plate is connected with the detection ring, a lead screw is rotatably connected between the two fixed plates, the lead screw is located between the two guide rods, and a second moving plate is threadedly connected with the side wall of the lead screw, one end of the second moving plate is connected with the detection ring, and a fourth motor is fixedly connected with one of the two fixed plates at a side away from the second moving plate, and the output end of the fourth motor is connected with the lead screw.

[0017] Compared with the prior art, the screw air compressor rotor flaw detection device has the following beneficial effects:

[0018] 1、The screw air compressor rotor flaw detection device can realize synchronous flaw detection testing of multiple helical tooth surfaces by using multiple ultrasonic flaw detectors and ultrasonic flaw heads, and under the cooperation of the control assembly, the driving assembly and the adjusting assembly, the ultrasonic flaw head moves on the surface of the helical tooth surface at a path equal to the tooth root spacing, so that the ultrasonic beam is incident on the tooth surface and the interior at a relatively fixed angle and path, thereby helping to reduce the uncertainty of refraction, scattering and attenuation of the sound beam, making the ultrasonic propagation in the helical tooth surface more stable, and more accurately reflecting the condition of the tooth surface and the interior, improving the identification and judgment of the tiny defects of the tooth surface, and improving the accuracy of the screw air compressor rotor flaw detection.

[0019] 2、The screw air compressor rotor flaw detection device of the application, through the setting of the adjusting assembly, makes the normal of the ultrasonic flaw detection head and the helical tooth surface flush, so that the ultrasonic beam can be more vertically incident to the surface and the inside of the helical tooth surface, reduces the sound beam refraction and scattering caused by angle deviation, makes the propagation path of the ultrasonic wave in the helical tooth surface more stable and predictable, and thus improves the accuracy of the defect position detection test. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structure schematic diagram of the application;

[0021] Figure 2 It is the installation structure schematic diagram of the detection mechanism and the helical tooth surface of the application;

[0022] Figure 3 It is the internal structure schematic diagram of the detection mechanism, the control mechanism and the driving mechanism of the application;

[0023] Figure 4 It is the structure schematic diagram of the adjusting assembly and the rotating assembly of the application;

[0024] Figure 5 It is Figure 3 The enlarged view of A in the figure;

[0025] Figure 6 It is Figure 4 The enlarged view of B in the figure;

[0026] Figure 7 It is Figure 5 The enlarged view of C in the figure;

[0027] Figure 8 It is the position structure schematic diagram of the two control rods and the helical tooth surface of the application;

[0028] Figure 9 It is the schematic diagram of the two control rods at different positions of the helical tooth surface of the application;

[0029] Figure 10 It is the ultrasonic probe and the helical tooth surface root distance control schematic diagram of the application.

[0030] In the figure: 101, workbench; 102, rotating shaft; 103, helical tooth surface; 104, tailstock center; 201, detection ring; 202, detection tube; 203, mounting frame; 204, ultrasonic flaw detection head; 205, ultrasonic flaw detector; 206, connecting wire; 301, control panel; 302, control rod; 401, driving rod; 402, double-end threaded rod; 403, first motor; 404, mounting base plate; 501, strip-shaped 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, fixed plate; 802, guide rod; 803, first moving plate; 804, second moving plate; 805, lead screw; 806, fourth motor. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0032] Embodiment 1

[0033] Please refer to Figures 1-10 , a screw type air compressor rotor flaw detection device shown in the figure, including workbench 101, rotating shaft 102 and a plurality of helical tooth surfaces 103 arranged on the side wall of rotating shaft 102, workbench 101 is provided with two tailstock centers 104 for positioning rotating shaft 102, further including a detection assembly arranged on workbench 101 for flaw detection of each helical tooth surface 103;

[0034] The detection assembly comprises a detection ring 201 slidably connected to the two workbenches 101, the detection ring 201 is arranged concentrically with the rotating shaft 102, a plurality of detection tubes 202 are slidably connected to one side of the detection ring 201 close to each helical tooth surface 103, the detection ring 201 is provided with an adjusting assembly for adjusting the height of each detection tube 202, each detection tube 202 is provided with a mounting frame 203 close to one end of the helical tooth surface 103, each mounting frame 203 is provided with an ultrasonic flaw detection head 204 close to one end of the helical tooth surface 103, each detection tube 202 is provided with a control assembly for controlling the flaw detection path of the ultrasonic flaw detection head 204, one end of each detection tube 202 away from the helical tooth surface 103 is connected to an ultrasonic flaw detector 205 through a strip-shaped support plate, each ultrasonic flaw detection head 204 is electrically connected to the ultrasonic flaw detector 205 through a connecting wire 206, each connecting wire 206 penetrates through the detection tube 202, and the workbench 101 is provided with a moving assembly for driving each ultrasonic flaw detection head 204 to move on the surface of the helical tooth surface 103;

[0035] It should be noted that: through the setting of the detection assembly, the synchronous flaw detection of the plurality of helical tooth surfaces 103 is realized by using the plurality of ultrasonic flaw detectors 205 and ultrasonic flaw detection heads 204, and under the cooperation of the control assembly, the driving assembly, the adjusting assembly and the adjusting assembly, the ultrasonic flaw detection head 204 moves on the surface of the helical tooth surface 103 with a path equal to the root gap, so as to ensure that the ultrasonic beam is incident to the tooth surface and the inside with a relatively fixed angle and path, thereby helping to reduce the uncertainty of refraction, scattering and attenuation of the sound beam, making the propagation of ultrasonic waves in the helical tooth surface 103 more stable, thereby more accurately reflecting the condition of the tooth surface and the inside, improving the identification and judgment of the tiny defects of the tooth surface, and thereby improving the accuracy of the flaw detection of the screw type air compressor rotor.

[0036] It is worth noting that: the ultrasonic flaw detector 205 is mainly composed of a transmitting circuit, a receiving circuit, an ultrasonic flaw detection head 204, a time base circuit, a display circuit and a power supply circuit. In actual use, the ultrasonic flaw detection head 204 emits ultrasonic waves to the surface of the helical tooth surface 103, and the ultrasonic waves propagate to 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 is reflected back at the interface between the tooth surface and the medium, forming an interface reflected wave. Another part of the ultrasonic waves will continue to propagate inside the tooth surface. If there is a defect such as a crack or a pore inside the tooth surface, 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 them, the reflected wave propagates to the ultrasonic flaw detection head 204. After the ultrasonic flaw detection head 204 receives the reflected ultrasonic wave, it is converted into an electrical signal. The receiving circuit amplifies and filters these weak electrical signals, removes interference signals, and improves signal quality. The time base circuit determines the position information corresponding to the reflected signal according to the propagation time of the ultrasonic wave. The processed signal is displayed on the screen in the form of a waveform or an image through the display circuit. The operator can determine whether the helical tooth surface 103 has a defect, as well as the location, size and nature of the defect, according to the displayed waveform characteristics such as amplitude, shape, position, etc. For example, the waveform of a normal tooth surface is regular, only with interface reflected wave and other characteristic signals. If there is a defect, additional wave peaks or troughs will appear on the waveform. According to the position and amplitude of these abnormal signals, the specific situation of the defect can be analyzed, which is prior art and will not be described in detail here.

[0037] Please refer to Figure 5 and Figure 7 , the control assembly in the figure includes two control plates 301 symmetrically arranged and connected to the detection tube 202 near the ultrasonic flaw detection head 204, the control rods 302 are fixedly connected to the sides of the two control plates 301 away from each other, one of the two control plates 301 is provided with an adjusting assembly for adjusting the detection angle of the ultrasonic flaw detection head 204, and the detection tube 202 is provided with a driving assembly for driving the two control plates 301.

[0038] It should be noted that: through the setting of the control assembly, the ultrasonic flaw detection head 204 moves on the surface of the helical tooth surface 103 along a path with a tooth root spacing equal to the tooth root spacing, ensuring that the ultrasonic beam is incident on the tooth surface and the inside at a relatively fixed angle and path, thereby helping to reduce the uncertainty of refraction, scattering and attenuation of the sound beam, making the propagation of ultrasonic waves in the helical tooth surface 103 more stable, and thus more accurately reflecting the situation of the tooth surface and the inside, improving the identification and judgment of small defects on the tooth surface, and thus improving the accuracy of the detection of the helical tooth surface 103.

[0039] As shown in Figure 5 and Figure 7 , the two control rods 302 are provided with protective pads at the ends away from each other, and 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 the protective pads are arranged on the side of the control rod 302 close to the helical tooth surface 103, so as to avoid scratching the helical tooth surface 103 when the control rod 302 slides on the surface of the helical tooth surface 103.

[0041] As shown in Figure 5 and Figure 7 , the driving assembly includes two driving rods 401 symmetrically arranged and fixedly connected to the inner wall of the detection tube 202, the two control plates 301 are slidingly connected to the driving rods 401, and the two driving rods 401 are rotatably connected to the double-head threaded rod 402, and the two ends of the double-head threaded rod 402 are rotatably connected to the inner wall of the detection tube 202. The two control plates 301 are respectively threadedly connected to the two different screw threads on the side wall of the double-head threaded rod 402;

[0042] It should be noted that the driving assembly is arranged to facilitate the relative movement of the two control plates 301 away from or close to each other, so as to adjust the distance between the two control rods 302 and the depth of the two control rods 302 inserted between the adjacent two helical tooth surfaces 103, thereby adjusting the distance between the ultrasonic flaw detection head 204 and the tooth surface root (for reference Figure 8 and Figure 9 ), so as to adapt to different detection requirements and improve the flexibility of the helical tooth surface 103 flaw detection.

[0043] As shown in Figure 5 and Figure 7 , the detection tube 202 is fixedly connected with a mounting base plate 404, and the mounting base plate 404 is fixedly connected with a first motor 403 away from the detection tube 202, and the output end of the first motor 403 is connected with the double-head threaded rod 402;

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

[0045] As shown in Figure 5 and Figure 7The adjusting assembly in the drawing includes a strip-shaped plate 501 arranged on the control plate 301 close to the ultrasonic flaw detection head 204, one end of the strip-shaped plate 501 is connected with the mounting frame 203, the control plate 301 close to the ultrasonic flaw detection head 204 is fixedly connected with a second motor 502, and an output end of the second motor 502 is connected with the strip-shaped plate 501;

[0046] It should be noted that: through the arrangement of the adjusting assembly, the normal of the ultrasonic flaw detection head 204 is flush with the normal of the spiral tooth surface 103, so that the ultrasonic beam can be more vertically incident to the surface and the inside of the spiral tooth surface 103, the sound beam refraction and scattering caused by the angle deviation are reduced, the propagation path of the ultrasonic wave in the spiral tooth surface 103 is more stable and predictable, and the accuracy of detecting the defect position is improved.

[0047] Please refer to Figure 4 and Figure 6 The adjusting assembly in the drawing includes adjusting holes 601 arranged on the detection ring 201 close to the detection tubes 202, adjusting plates 602 are slidably connected with the adjusting holes 601, one end of each adjusting plate 602 away from the bottom wall of the adjusting hole 601 is connected with the detection tube 202, rotating threaded rods 603 are rotatably connected between the two inner walls of each adjusting hole 601, each adjusting plate 602 is threadedly connected with the rotating threaded rod 603, and the detection ring 201 is provided with a rotating assembly for synchronously rotating the rotating threaded rods 603.

[0048] It should be noted that: through the arrangement of the adjusting assembly, each detection tube 202 is driven to move close to or away from the spiral tooth surface 103.

[0049] Please refer to Figure 4 and Figure 6 The rotating assembly in the drawing includes a rotating ring 701 rotatably connected with the side wall of the detection ring 201, a plurality of arc-shaped gear rings 702 are fixedly connected to one side of the rotating ring 701 close to the rotating threaded rods 603, a connecting rod 706 is fixedly connected to one end of each rotating threaded rod 603 close to the rotating ring 701, each connecting rod 706 penetrates through the detection ring 201 and is fixedly connected with a gear 703, and each gear 703 is meshed with each arc-shaped gear ring 702.

[0050] It should be noted that: through the arrangement of the rotating assembly, each rotating threaded rod 603 is driven to synchronously rotate, so that the synchronous adjustment of each detection tube 202 is realized.

[0051] Please refer to Figure 4 and Figure 6The detection ring 201 in the drawing is fixedly connected with an L-shaped plate 704 close to one side of the rotating ring 701, the L-shaped plate 704 is fixedly connected with a third motor 705 away from the detection ring 201, and the output end of the third motor 705 is connected with the rotating screw rod 603.

[0052] It should be noted that: the third motor 705 is arranged to drive one of the gears 703 to rotate.

[0053] Please refer to Figure 1 The moving assembly in the drawing comprises two fixed plates 801 fixedly connected to the workbench 101 close to the tailstock center 104, a guide rod 802 fixedly connected between the two fixed plates 801, a first moving plate 803 slidably connected to the guide rod 802, one end of the two first moving plates 803 connected with the detection ring 201, a lead screw 805 rotatably connected between the two fixed plates 801, a second moving plate 804 threadedly connected to the side wall of the lead screw 805, one end of the second moving plate 804 connected with the detection ring 201, a fourth motor 806 fixedly connected to one of the two fixed plates 801 away from the second moving plate 804, and the output end of the fourth motor 806 connected with the lead screw 805.

[0054] It should be noted that: the moving assembly is arranged to drive the detection ring 201 to move, thereby driving each ultrasonic flaw detection head 204 to move on the surface of the helical tooth surface 103.

[0055] In the scheme: a screw type air compressor rotor flaw detection device comprises the following steps:

[0056] When the screw type air compressor rotor is detected, first, the rotating shaft 102 is placed between the two tailstock centers 104, and then the two tailstock centers 104 are used to abut against the two ends of the rotating shaft 102, thereby ensuring the position limitation of the rotating shaft 102 and enabling the rotating shaft 102 to maintain the rotating characteristics, and after the position of the rotating shaft 102 is limited, the position limitation of the plurality of helical tooth surfaces 103 is realized.

[0057] After the position of each helical tooth surface 103 is defined, the coupling agent is evenly applied on the surface of each helical tooth surface 103. After the application of the coupling agent is completed, the fourth motor 806 (model RS-775PH-8011R, as prior art, not described in detail here) is started to drive the screw rod 805 to rotate. During the rotation of the screw rod 805, the detection ring 201 is moved close to the helical tooth surface 103 by the threaded engagement transmission between the screw rod 805 and the second moving plate 804 and the guiding action between the two guide rods 802 and the first moving plate 803. During the movement of the detection ring 201 close to the helical tooth surface 103, each detection tube 202 is moved close to the helical tooth surface 103 synchronously;

[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, as prior art, not described in detail here) is started to drive the gear 703 at one end of the connecting rod 706 to rotate. During the rotation of the gear 703, each rotating threaded rod 603 is synchronously rotated by the meshing transmission between the gear 703 and the arc-shaped gear ring 702 on the side wall of the rotating ring 701, and then each detection tube 202 is moved close to the helical tooth surface 103 by the threaded engagement transmission between each rotating threaded rod 603 and the adjusting plate 602.

[0059] During the movement of each detection tube 202 close to the helical tooth surface 103, when each detection tube 202 is inserted into the tooth groove between the adjacent two helical tooth surfaces 103 (for reference Figure 8 and Figure 9 ), the opposite two control rods 302 are synchronously inserted into the tooth groove between the adjacent two helical tooth surfaces 103. With the continuous downward movement of the detection tube 202, when the opposite two control rods 302 respectively abut against the side walls of the adjacent two helical tooth surfaces 103, the downward movement of the detection tube 202 is stopped.

[0060] When the two control rods 302 respectively abut against the side walls of the two adjacent helical tooth surfaces 103, whether the ultrasonic flaw detection head 204 at one end of the mounting frame 203 is parallel to the normal direction of the helical tooth surface 103, if the ultrasonic flaw detection head 204 is not parallel to the normal direction of the helical tooth surface 103, the second motor 502 (model RS-550PH-4559RD, as prior art, not described in detail here) can be started to drive the strip-shaped plate 501 to rotate, and then drive the ultrasonic flaw detection head 204 at one side of the mounting frame 203 to rotate, so that the ultrasonic flaw detection head 204 is parallel to the normal direction of the helical tooth surface 103, so that the ultrasonic beam can be more vertically incident to the surface and the inside 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 detecting the defect position;

[0061] After the adjustment of the use angle of the ultrasonic flaw detection head 204 is completed, the detection ring 201 can be moved again by using the moving assembly, and in the process of moving the detection ring 201, the two control rods 302 will be moved synchronously, and in the process of moving the two control rods 302, the helical tooth surface 103 will be rotated by using the interaction force between the two control rods 302 and the two adjacent helical tooth surfaces 103, so that the helical tooth surface 103 rotates adaptively in the process of moving the detection tube 202 in the transverse direction, so as to not interfere with the movement of the ultrasonic flaw detection head 204;

[0062] And in the process of the two opposite control rods 302 moving on the surfaces of the two adjacent spiral tooth surfaces 103, the ultrasonic flaw detection head 204 will move on the surfaces of the spiral tooth surfaces 103 with a path equal to the root clearance under the abutting action of the two control rods 302 and the two adjacent spiral tooth surfaces 103, and in the process of the ultrasonic flaw detection head 204 moving, ultrasonic waves will be emitted to the surfaces of the spiral tooth surfaces 103, and the ultrasonic waves will propagate to the surfaces of the spiral tooth surfaces 103 with a certain frequency and direction, when the ultrasonic waves meet the surfaces of the spiral tooth surfaces 103, because the acoustic impedance of the tooth surface and the surrounding medium (such as air) is different, part of the ultrasonic waves will be reflected back at the interface between the tooth surface and the medium to form interface reflected waves, and another part of the ultrasonic waves will continue to propagate inside the tooth surface, if there are defects such as cracks, pores, etc. inside the tooth surface, because the acoustic impedance of the defects and the surrounding material is different, the ultrasonic waves will be reflected, refracted and scattered again when they meet the defects, among which the reflected waves will propagate to the ultrasonic flaw detection head 204, and the ultrasonic flaw detection head 204 will convert the reflected ultrasonic waves into electrical signals after receiving them, the receiving circuit will amplify, filter and process these weak electrical signals to remove interference signals and improve signal quality, the time base circuit will determine the position information corresponding to the reflected signals according to the propagation time of the ultrasonic waves, and the processed signals will be displayed on the screen in the form of waveforms or images through the display circuit, and the operator will judge whether the spiral tooth surface 103 has defects, and the position, size and nature of the defects, etc. according to the displayed waveform characteristics such as amplitude, shape, position, etc. For example, the waveform of a normal tooth surface is relatively regular, only with interface reflected waves and other characteristic signals, if there are defects, additional wave peaks or troughs and other abnormal signals will appear on the waveform, and according to the position and amplitude of these abnormal signals, the specific situation of the defects can be analyzed;

[0063] And in the process of the ultrasonic flaw detection head 204 moving, the ultrasonic flaw detection head 204 will move on the surfaces of the spiral tooth surfaces 103 with a path equal to the root clearance under the abutting action of the two control rods 302 and the two adjacent spiral tooth surfaces 103, which ensures that the ultrasonic beam is incident to the tooth surface and the inside with a relatively fixed angle and path, thereby helping to reduce the uncertainty of refraction, scattering and attenuation of the acoustic beam, making the propagation of ultrasonic waves in the spiral tooth surface 103 more stable, and thus more accurately reflecting the situation of the tooth surface and the inside, improving the identification and judgment of small defects of the tooth surface, and thereby improving the accuracy of the ultrasonic flaw detection of the screw type air compressor rotor;

[0064] And when adjusting the distance between the ultrasonic flaw detection head 204 and the root of the spiral tooth surface 103, the first motor 403 (model RS-550PHF-6537GY, as prior art, not described in detail here) can be started to drive the double-headed threaded rod 402 to rotate, and then under the threaded meshing transmission action of the double-headed threaded rod 402 and the two control plates 301 and the guiding action of the driving rod 401, the two control plates 301 are driven to move away from each other or move close to each other, and then the two control rods 302 are driven to move away from each other or move close to each other, and then the distance between the two control rods 302 is adjusted, and the depth of the two control rods 302 inserted between the adjacent two spiral tooth surfaces 103 is adjusted, and then the adjustment of the distance between the ultrasonic flaw detection head 204 and the root of the tooth surface is realized (for reference Figure 8 and Figure 9 ), so as to adapt to different detection requirements and improve the flexibility of the spiral tooth surface 103 flaw detection.

[0065] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0066] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application 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 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 detector 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). 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). 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 strips with different directions of rotation on the side wall of the double-threaded rod (402). The adjustment assembly includes adjustment holes (601) opened 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 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); 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). 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).

2. The screw air compressor rotor flaw detection device according to claim 1, 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).

3. The screw air compressor rotor flaw detection device according to claim 1, 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).

4. The screw air compressor rotor flaw detection device according to claim 1, 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).

5. The screw air compressor rotor flaw detection device according to claim 1, 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).

Images