Gearbox gear shaft flaw detection device

Abstract

The invention relates to the technical field of flaw detection devices for shaft workpieces, in particular to a flaw detection device for a gearbox gear shaft. Comprising a mounting shell, and a detection host is arranged on one side of the mounting shell; the ultrasonic probe is mounted in the mounting shell; the two sets of positioning frames are symmetrically distributed and rotationally connected to the mounting shell, the number of the positioning frames in each set is two, the two positioning frames are distributed in a central symmetry mode, and the positioning frames are rotationally connected with fixing shafts; the two first liquid storage shells are symmetrically distributed and fixedly connected to the adjacent fixing shafts correspondingly. Through mutual cooperation of the symmetrically-distributed positioning frames, the stability of the mounting shell is jointly maintained, namely the stability of the position of the ultrasonic probe is maintained, and the situation that the ultrasonic probe deviates from the center line of the to-be-detected shaft due to shaking in the moving process of the mounting shell, even if the propagation path of sound waves is changed, the accuracy of a detection result is affected is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of flaw detection devices for shaft workpieces, and in particular to a flaw detection device for a gear shaft of a transmission case. Background Art

[0002] The gear shaft of the gearbox is one of the key components of the vehicle gearbox, which is used to transmit power and realize the conversion of different gears. The gear shaft needs to be inspected after a period of use (to detect the wear of the gear shaft surface, whether there are defects inside the gear shaft, and whether the gear shaft is corroded, etc.) to ensure that the gear shaft can be used normally. Commonly used flaw detection methods include magnetic particle testing, penetrant testing, ultrasonic testing and X-ray testing, among which ultrasonic testing is usually performed by staff using ultrasonic detectors to detect the gear shaft.

[0003] When using an ultrasonic detector, a worker needs to hold a detection probe, place the detection probe on the surface of the gear shaft, and point the detection probe toward the axis of the shaft to be measured. The detection probe is then continuously moved to change the detection position. However, the contact area between the current detection probe and the gear shaft is usually flat, which causes the detection probe to easily deflect during movement, causing the sound waves to be unable to propagate along the expected path, thereby changing the detection range of the detection probe, making the actual position of the defect inconsistent with the position displayed by the detection system, resulting in inaccurate defect positioning. Summary of the invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a gearbox gear shaft flaw detection device.

[0005] The technical solution of the present invention is: a gearbox gear shaft flaw detection device, comprising: An installation shell, a detection host is arranged on one side of the installation shell; An ultrasonic probe is installed inside the installation shell, and the ultrasonic probe is electrically connected to the detection host; The positioning frames have two groups that are symmetrically distributed and are both rotatably connected to the mounting shell. There are two positioning frames in each group. The two positioning frames are centrally symmetrically distributed and are rotatably connected to a fixed shaft. The first liquid storage shell has two symmetrically distributed shells, which are respectively fixed to the adjacent fixed shafts. The interior of the first liquid storage shell is slidably connected to a connecting shell, and the connecting shell is fixed to the adjacent fixed shafts. The first piston rod has two symmetrically distributed first liquid storage shells, each of which is slidably connected to the first liquid storage shells. The first piston rod slides in the adjacent connecting shells. The first piston rod and the adjacent connecting shells are both provided with symmetrically distributed arc through holes. The symmetrically distributed arc through holes on the first piston rod are connected and matched with the adjacent arc through holes on the adjacent connecting shells. The driving components are provided with two symmetrically distributed ones, which are respectively arranged on different connecting shells. The driving components are used to change the flow area of ​​the symmetrically distributed arc-shaped through holes on the connecting shells.

[0006] Furthermore, the driving assembly includes: A driving ring, threadedly connected to one end of the adjacent connecting shell close to the adjacent fixed shaft; A connecting ring is rotatably connected to the driving ring, a limiting pin is fixed inside the connecting ring, the connecting shell is provided with a sliding groove, the limiting pin on the connecting ring slides in the sliding groove of the adjacent connecting shell, a limiting groove is provided at one end of the first piston rod close to the adjacent fixed shaft, and the limiting pin on the connecting ring slides in the adjacent limiting groove.

[0007] Furthermore, the contact portion between the limit pin on the connecting ring and the adjacent first piston rod is configured as a curved surface, so as to reduce the friction between the limit pin and the first piston rod.

[0008] Furthermore, the limiting groove is arc-shaped, and the angle corresponding to its projection on the adjacent first piston rod is not less than the angle of the arc-shaped through hole on the first piston rod.

[0009] Furthermore, the angle of the symmetrically distributed arc-shaped through holes on the connecting shell and the angle of the symmetrically distributed arc-shaped through holes on the first piston rod are both no greater than 90°.

[0010] Furthermore, it also includes: A detection mechanism is arranged on the mounting shell, and is used to detect the roughness of the surface of the shaft to be tested. The detection mechanism includes: The connecting seats are provided with two symmetrically distributed ones, and are respectively connected to the adjacent positioning frames by penetrating sliding mode. The positioning frame provided with the connecting seats is provided with a moving module, and the moving module is used to drive the connecting seats on the same positioning frame to move; The connecting shafts are symmetrically arranged and are respectively rotatably connected to the adjacent connecting seats. The symmetrically arranged connecting shafts are commonly wound with a transmission belt, and the connecting seats and the connecting shafts thereon are commonly provided with a torsion spring; The second liquid storage shell is fixedly connected to one of the connecting seats through a connecting piece. The interior of the second liquid storage shell is slidably connected with a second piston rod. The second piston rod is threadedly connected to the adjacent connecting shaft. The second piston rod is used to squeeze the liquid in the second liquid storage shell. A coating component is provided on one side of the mounting shell, and the coating component is used to coat a coupling agent to the surface of the shaft to be measured.

[0011] Furthermore, the coating assembly comprises: A ball valve is fixedly connected to one side of the mounting shell, and two ports of the ball valve are respectively fixedly connected to and communicated with a feed pipe and a nozzle. The feed pipe is externally connected to a conveying module, and the conveying module is used to convey the coupling agent into the feed pipe, and the nozzle is used to spray the coupling agent onto the shaft to be tested; A drive tube is fixedly connected to a side of the mounting shell close to the feed tube, a push plate is slidably connected inside the drive tube, the drive tube is connected to the second liquid storage shell via a connecting tube, and an adjustment module is provided together with the push plate and the rotating shaft of the ball valve, and the adjustment module is used to change the flow area of ​​the ball valve.

[0012] Furthermore, the thickness of the transmission belt decreases from the middle to both sides.

[0013] Furthermore, it also includes: The elastic expansion plates are provided with two symmetrically distributed plates, both of which are fixed to one side of the mounting shell close to the discharge pipe. The symmetrically distributed elastic expansion plates are respectively located on both sides of the nozzle.

[0014] Furthermore, the lower side surface of the telescopic portion of the elastic telescopic plate is located below the lower side surface of the mounting shell.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention maintains the stability of the mounting shell, that is, maintains the stability of the position of the ultrasonic probe, through the mutual cooperation of the symmetrically distributed positioning frames, and avoids the deviation of the ultrasonic probe and the center line of the axis to be measured caused by shaking during the movement of the mounting shell, even if the propagation path of the sound wave is changed, affecting the accuracy of the detection result.

[0016] The surface roughness of the shaft to be tested is detected through a transmission belt, and then the flow area of ​​the ball valve is changed, that is, the volume of coupling agent flowing out of the nozzle per unit time is changed, and the coupling agent fills the gap on the surface of the groove of the shaft to be tested, ensuring the stability of the acoustic contact between the ultrasonic probe and the shaft to be tested, thereby improving the accuracy of the test results.

[0017] The coupling agent is intercepted by the elastic telescopic plate, the flow speed of the coupling agent is reduced, and the residence time of the coupling agent is increased, so as to avoid the situation that after the coupling agent flows rapidly along the surface of the gear shaft, the mounting shell is exposed to too little coupling agent during the movement, thereby increasing the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the ultrasonic probe and the positioning frame of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the positioning frame and the first liquid storage shell of the present invention; Figure 4 is a three-dimensional structural cross-sectional view of the first liquid storage shell of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the first liquid storage shell and the connecting shell of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the connecting shell of the present invention; Figure 7 It is a three-dimensional structure explosion diagram of the driving ring and the connecting ring of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the transmission belt and the second liquid storage shell of the present invention; Fig. 9 It is a three-dimensional structural schematic diagram of the positioning frame and the connecting seat of the present invention; Fig.10 A three-dimensional structural cross-sectional view of the second liquid storage shell and the second piston rod of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the connecting seat and the connecting shaft of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the driving tube and the push plate of the present invention; Fig.13 It is a schematic diagram of the three-dimensional structure of the mounting shell and the elastic expansion plate of the present invention.

[0019] The names and serial numbers of the parts in the figure are: 1-installation shell, 2-ultrasonic probe, 3-positioning frame, 31-fixed shaft, 5-first liquid storage shell, 6-connecting shell, 7-first piston rod, 8-driving ring, 9-connecting ring, 10-limiting groove, 11-connecting seat, 12-connecting shaft, 13-transmission belt, 14-second liquid storage shell, 15-second piston rod, 171-feeding pipe, 18-ball valve, 181-spray head, 19-driving pipe, 20-push plate, 21-elastic telescopic plate. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 7As shown, the present invention proposes a gearbox gear shaft flaw detection device for flaw detection of the gear shaft, comprising: a mounting shell 1, a detection host is arranged on one side of the mounting shell 1; an ultrasonic probe 2 is mounted inside the mounting shell 1, and the ultrasonic probe 2 is electrically connected to the detection host; a positioning frame 3, having two groups of left-right symmetrical distribution, both of which are rotatably connected to the mounting shell 1, and each group of positioning frames 3 has two positioning frames 3, and the two positioning frames 3 are centrally symmetrically distributed, and the positioning frames 3 are rotatably connected to a fixed shaft 31; a first liquid storage shell 5, having two left-right symmetrical distributions, respectively fixed to adjacent fixed shafts 31, and the interior of the first liquid storage shell 5 is slidably connected to A connecting shell 6, which is fixedly connected to an adjacent fixed shaft 31; a first piston rod 7, which has two symmetrically distributed ones, which are respectively slidably connected to the adjacent first liquid storage shell 5, and the first piston rod 7 slides in the adjacent connecting shell 6. The first piston rod 7 and the adjacent connecting shell 6 are both provided with two symmetrically distributed arcuate through holes, and the two arcuate through holes on the first piston rod 7 are connected and matched with the adjacent arcuate through holes on the adjacent connecting shell 6; a driving assembly, which has two symmetrically distributed ones, which are respectively arranged on different connecting shells 6, and the driving assembly is used to change the connection relationship between the two symmetrically distributed arcuate through holes on the first piston rod 7 and the adjacent arcuate through holes on the adjacent connecting shell 6.

[0022] In the above scheme, the problem that the existing ultrasonic probe is easy to deflect during movement is solved. The gear shaft flaw detection device in this embodiment includes a mounting shell 1, and the lower side of the mounting shell 1 is a smooth surface to reduce the friction between the mounting shell 1 and the surface of the gear shaft, so as to avoid the friction between the mounting shell 1 and the surface of the gear shaft during the movement of the mounting shell 1, which causes the surface of the gear shaft to wear. The lower part of the positioning frame 3 is in contact with the surface of the gear shaft, and the contact surface between the positioning frame 3 and the gear shaft is also a smooth surface, and the function is to reduce the friction between the surface of the gear shaft. The angle between the two positioning frames 3 in the same group can be adjusted at will, and the length of the positioning frame 3 at the lower side of the hinge is greater than the length of the upper side. The interior of the first liquid storage shell 5 is filled with hydraulic oil. The fixed shaft 31 is located on the upper side of the adjacent positioning frame 3. When the angle between the upper sides of the two positioning frames 3 in the same group increases, the adjacent connecting shell 6 and the adjacent first piston rod 7 are pulled out of the adjacent first liquid storage shell 5. At the same time, when the connecting shell 6 and the first piston rod 7 move, the hydraulic oil in the first liquid storage shell 5 flows through the two arc-shaped through holes on the adjacent connecting shell 6 and the two arc-shaped through holes on the adjacent first piston rod 7.

[0023] Furthermore, the driving assembly includes: a driving ring 8, which is threadedly connected to one end of the adjacent connecting shell 6 close to the adjacent fixed shaft 31; a connecting ring 9, which is rotatably connected to the driving ring 8, and a limiting pin is fixed inside the connecting ring 9. The connecting shell 6 is provided with a slide groove, and the limiting pin on the connecting ring 9 slides in the slide groove of the adjacent connecting shell 6. A limiting groove 10 is provided at one end of the first piston rod 7 close to the adjacent fixed shaft 31, and the limiting pin on the connecting ring 9 slides in the adjacent limiting groove 10. The limiting groove 10 is arc-shaped and the angle corresponding to the projection on the adjacent first piston rod 7 is not less than the angle of the arc-shaped through hole on the first piston rod 7, ensuring that the connecting shell 6 completely blocks the symmetrically distributed arc-shaped through holes on the adjacent first piston rod 7.

[0024] In the above scheme, the drive ring 8 is provided with an internal thread, and the end of the connecting shell 6 close to the adjacent fixed shaft 31 is provided with an external thread that cooperates with the internal thread on the adjacent drive ring 8, so that the drive ring 8 drives the adjacent connecting ring 9 and the limit pin thereon to move during the rotation process, and at the same time, the limit pin squeezes the limit groove 10, thereby causing the first piston rod 7 to rotate, so as to change the relative position of the two arc-shaped through holes on the first piston rod 7 and the two arc-shaped through holes on the connecting shell 6.

[0025] Furthermore, the contact portion between the limit pin on the connecting ring 9 and the adjacent first piston rod 7 is configured as a curved surface, so as to reduce the friction between the limit pin and the first piston rod 7 and facilitate the normal movement of the connecting ring 9 .

[0026] Furthermore, the angle of the two arc-shaped through holes on the connecting shell 6 and the angle of the two arc-shaped through holes on the first piston rod 7 are both no greater than 90°, so that the first piston rod 7 completely covers the two arc-shaped through holes on the connecting shell 6 .

[0027] When performing flaw detection on a gear shaft after it is put into use, the staff needs to first fix the shaft to be tested on a fixing frame (the fixing frame is an existing device, not shown in the figure, and the specific shape and type of the fixing frame can be specifically selected by the staff when using it), and then the staff adjusts the opening angles of the two sets of positioning frames 3 according to the diameter of the shaft to be tested. The following takes the adjustment process of the left set of positioning frames 3 as an example: The staff pulls the lower sides of the two positioning frames 3 on the left to open the lower sides of the two positioning frames 3 on the left, and at the same time, the upper sides of the two positioning frames 3 respectively drive the adjacent first liquid storage shell 5 and the adjacent connecting shell 6 to move synchronously. During the movement of the connecting shell 6, the drive ring 8, the connecting ring 9 and the upper limit pin on the connecting ring 9 drive the first piston rod 7 on the left to move synchronously, that is, the connecting shell 6 on the left and the first piston rod 7 on the left are pulled out of the first liquid storage shell 5 on the left. During the movement of the connecting shell 6 on the left and the first piston rod 7 on the left, the hydraulic oil in the first liquid storage shell 5 on the left flows through the arc-shaped through holes on the two.

[0028] Until the opening angle of the two left positioning frames 3 can make the two left positioning frames 3 and the left side edge of the mounting shell 1 contact with the curved surface of the shaft to be measured at the same time, the staff stops swinging the two left positioning frames 3 and rotates the left driving ring 8, so that the left driving ring 8 drives the left connecting ring 9 to move forward synchronously. At the same time, during the movement of the connecting ring 9, the limit pin on the connecting ring 9 squeezes the left limit groove 10, even if the left first piston rod 7 is rotated by the squeezing force, until the left driving ring 8 moves to the left to the limit position, the staff stops rotating the left driving ring 8. At this time, the left first piston rod 7 rotates to the limit state, and the two arc-shaped through holes on the left first piston rod 7 are misaligned with the two arc-shaped through holes on the left connecting shell 6, that is, the left first piston rod 7 completes the shielding of the two arc-shaped through holes on the left connecting shell 6, thereby fixing the left connecting shell 6 and the left first piston rod 7 at this position.

[0029] After adjusting the positions of the two left positioning frames 3 as mentioned above, the staff adjusts the positions of the two right positioning frames 3 according to the above operations. When the positions of the four positioning frames 3 are adjusted, the staff places the device on the curved surface of the axis to be measured. At this time, the four positioning frames 3 and the front and rear sides of the mounting shell 1 are tangent to the axis to be measured at the same time. Then the detection host is started, and the ultrasonic probe 2 detects the axis to be measured (in the process of detecting the axis to be measured, the staff can choose to drive the axis to be measured to rotate by the fixed frame, or choose to rotate the mounting shell 1, but when rotating the mounting shell 1, it is necessary to synchronously move the mounting shell 1 laterally along the axis to be measured. When rotating the axis to be measured, it is only necessary to move the mounting shell 1 laterally along the axis to be measured. The two methods can be specifically selected by the staff). In the process of detecting the axis to be measured, in order to ensure the accuracy of the detection result and reduce the friction of the axis surface on the mounting shell 1, the staff needs to apply an appropriate amount of coupling agent on the surface of the axis to be measured.

[0030] In the above-mentioned process of detecting the shaft to be measured, the four positioning frames 3 and the mounting shell 1 are tangent to the curved surface of the shaft to be measured. At this time, the ultrasonic probe 2 is facing the center line of the shaft to be measured, and the four positioning frames 3 cooperate with each other to maintain the stability of the mounting shell 1, that is, to maintain the stability of the position of the ultrasonic probe 2, to avoid the mounting shell 1 shaking during the detection of the shaft to be measured, causing the ultrasonic probe 2 to deviate from the center line of the shaft to be measured, even if the propagation path of the sound wave changes, affecting the accuracy of the detection result.

[0031] After the flaw detection of the shaft to be tested is completed, the staff will separate the mounting shell 1 from the gear shaft after the flaw detection, then remove the tested gear shaft from the fixing device, and fix the next gear shaft to be tested on the fixing device. The staff will then measure the shaft diameter of the second gear shaft. If it is the same as the shaft diameter of the first gear shaft, there is no need to change the positions of the four positioning frames 3. If they are different, the staff will need to adjust the positions of the four positioning frames 3 according to the above operations to perform flaw detection on the second gear shaft.

[0032] Furthermore, Figure 2 and Figure 8-Figure 12 As shown, it also includes: a detection mechanism, which is arranged on the mounting shell 1, and the detection mechanism is used to detect the roughness of the surface of the shaft to be measured. The detection mechanism includes: a connecting seat 11, which has two symmetrically distributed on the left and right, and is respectively slidably connected to the adjacent positioning frames 3. The positioning frame 3 provided with the connecting seat 11 is provided with a moving module, and the moving module is used to drive the connecting seat 11 on the same positioning frame 3 to move; a connecting shaft 12, which has two symmetrically distributed on the left and right, and is respectively rotatably connected to the adjacent connecting seats 11. The two connecting shafts 12 are jointly wound with a transmission belt 13, and the connecting seat 11 and the connecting shaft 12 thereon are jointly provided with a torsion spring; a second liquid storage shell 14, which is fixed to one of the connecting seats 11 through a connecting piece, and the second piston rod 15 is slidably connected to the inside of the second liquid storage shell 14, and the second piston rod 15 is threadedly connected to the adjacent connecting shaft 12, and the second piston rod 15 is used to squeeze the liquid in the second liquid storage shell 14, and a coating component is provided on one side of the mounting shell 1, and the coating component is used to coat the coupling agent to the surface of the shaft to be measured.

[0033] In the above scheme, the two connecting seats 11 respectively penetrate the adjacent positioning frames 3 located at the front side. In the figure, the two moving modules are selected as a combination of a threaded rod and a moving block, wherein the two threaded rods are respectively threadedly matched with the adjacent moving blocks, the two threaded rods are respectively rotatably connected to the adjacent positioning frames 3, and the two moving blocks are respectively fixed to the adjacent connecting seats 11, and the connecting seats 11 can be driven to move along the adjacent positioning frames 3 by rotating the threaded rods. The connecting seat 11 is initially located at the bottom of the adjacent positioning frames 3. The length of the left connecting shaft 12 is greater than the length of the right connecting shaft 12, and the lower side surfaces of the two connecting shafts 12 are located on the same straight line. In order to avoid the two connecting shafts 12 and the transmission belt 13 from slipping, the transmission belt 13 can be selected as a synchronous belt, and the two connecting shafts 12 can be machined with toothed grooves. The transmission belt 13 is driven by the friction between it and the gear shaft to drive the two connecting shafts 12 to rotate. The interior of the second liquid storage shell 14 is filled with hydraulic oil. The upper side of the left connecting shaft 12 is provided with an external thread, and the second piston rod 15 is provided with an internal thread. The internal thread of the second piston rod 15 is matched with the external thread on the left connecting shaft 12, and the left connecting shaft 12 drives the second piston rod 15 to move during the rotation. The above-mentioned torsion spring can be set between any connecting shaft 12 and the connecting seat 11. The figure and the text are shown as an example of being set between the left connecting shaft 12 and the left connecting seat 11, which is used to increase the resistance of the two connecting shafts 12 and the transmission belt 13 during the rotation process, so that the rotation of the connecting shaft 12 has a prerequisite, that is, when the friction between the transmission belt 13 and the gear shaft increases to a certain value, the transmission belt 13 can drive the two connecting shafts 12 to rotate.

[0034] Furthermore, the coating assembly includes: a ball valve 18, which is fixedly connected to one side of the mounting shell 1, and the two ports of the ball valve 18 are respectively fixedly connected and connected to a feed pipe 171 and a nozzle 181, the feed pipe 171 is externally connected to a conveying module, the conveying module is used to convey the coupling agent into the feed pipe 171, and the nozzle 181 is used to spray the coupling agent onto the shaft to be tested; a drive tube 19, which is fixedly connected to one side of the mounting shell 1 close to the feed pipe 171, and the inside of the drive tube 19 is slidably connected with a push plate 20, the drive tube 19 is connected to the second liquid storage shell 14 through a connecting tube, and the push plate 20 and the rotating shaft of the ball valve 18 are jointly provided with an adjustment module, and the adjustment module is used to change the flow area of ​​the ball valve 18.

[0035] In the above scheme, the delivery module is an existing device, which can be selected as a combination of a pump and a delivery pipe, and the specific situation can be specifically selected during use. The flow area of ​​the ball valve 18 is not in the maximum state at the beginning. A plurality of spray holes are arranged at the lower end of the nozzle 181. The interior of the drive tube 19 is filled with hydraulic oil, and the hydraulic oil in the second liquid storage shell 14 is squeezed into the drive tube 19 through the connecting pipe by the second piston rod 15, thereby increasing the volume of the hydraulic oil in the drive tube 19. The adjustment module is selected as a combination of a gear and a rack in the figure, wherein the gear is fixedly connected to the rotating shaft of the ball valve 18, and the rack is fixedly connected to the rear side of the push plate 20. The push plate 20 is moved by the change in the volume of the hydraulic oil in the drive tube 19, and then the push plate 20 drives the rotating shaft of the ball valve 18 to rotate through the meshing of the rack and the gear.

[0036] Furthermore, the thickness of the transmission belt 13 decreases gradually from the middle to both sides.

[0037] In the above scheme, the specific shape of the transmission belt 13 is optimized to reduce the friction between the transmission belt 13 and the shaft to be measured when it moves along the positioning frame 3, so as to avoid the upper side of the rear part of the transmission belt 13 being squeezed by the shaft to be measured and deformed after the transmission belt 13 moves to contact the shaft to be measured, thereby affecting the normal use of the transmission belt 13.

[0038] After the positions of the four positioning frames 3 are adjusted, the staff adjusts the positions of the two connecting seats 11 through two moving modules according to the tangent positions of the two front positioning frames 3 and the axis to be measured. The specific process is as follows: The staff uses the moving module to drive the adjacent connecting seats 11 to move along the adjacent positioning frame 3 toward the mounting shell 1 until the middle of the transmission belt 13 moves to a position that coincides with the tangent of the positioning frame 3 and the shaft to be measured. The staff then stops moving the two connecting seats 11. At this time, the position where the transmission belt 13 contacts the shaft to be measured is deformed by the squeezing of the shaft to be measured, thereby increasing the squeezing force between the transmission belt 13 and the surface of the shaft to be measured, and increasing the friction between the transmission belt 13 and the surface of the shaft to be measured.

[0039] After the position adjustment of the transmission belt 13 is completed, the staff starts the conveying module, and the conveying module conveys the coupling agent into the feed pipe 171, and then the coupling agent flows downward along the feed pipe 171, the ball valve 18 and the nozzle 181. When the coupling agent flows to the lower side of the nozzle 181, it is dispersed by the nozzle hole on the nozzle 181, and a sufficient amount of coupling agent is evenly sprayed on the surface of the shaft to be tested. Then the staff starts the detection host and detects the shaft to be tested according to the above operation. However, during the detection process, whether the shaft to be tested rotates or the mounting shell 1 rotates, it needs to rotate counterclockwise (with Figure 1From right to left is the reference perspective), to prevent the transmission belt 13 from coming into contact with the coupling agent attached to the surface of the shaft to be measured during movement, which would reduce the friction between the transmission belt 13 and the shaft to be measured, thereby preventing the transmission belt 13 from rotating normally.

[0040] After the gear shaft has been put into use, the degree of wear of the gear shaft gradually increases with the increase of the use time. At this time, the surface roughness of some parts of the gear shaft will gradually increase. In the process of the above-mentioned mounting shell 1 moving laterally along the shaft to be measured, when the transmission belt 13 moves to contact the smooth surface of the shaft to be measured, the friction force between the shaft to be measured and the transmission belt 13 is not enough to enable the transmission belt 13 to overcome the elastic force of the torsion spring and drive the connecting shaft 12 to rotate.

[0041] When the transmission belt 13 moves to contact the rough surface of the shaft to be measured, the friction between the transmission belt 13 and the shaft to be measured increases. When the friction increases to be greater than the elastic force of the torsion spring, the transmission belt 13 starts to drive the two connecting shafts 12 to rotate. At the same time, the connecting shaft 12 on the left side causes the torsion spring to rotate and store force during the rotation process. During the rotation process, the connecting shaft 12 on the left side drives the second piston rod 15 to move along the second liquid storage shell 14 through the external thread thereon, and squeezes the hydraulic oil in the second liquid storage shell 14 into the drive pipe 19 through the connecting pipe, thereby increasing the volume of the hydraulic oil in the drive pipe 19, and then the push plate 20 is squeezed by the hydraulic oil and moves backward along the adjacent drive pipe 19. At the same time, during the movement process, the push plate 20 drives the rotating shaft of the ball valve 18 to rotate through the adjusting module, thereby increasing the flow area of ​​the ball valve 18, that is, increasing the volume of the coupling agent flowing out of the nozzle 181 per unit time, and the gap on the rough surface of the shaft to be measured is filled with the coupling agent, thereby ensuring the acoustic contact between the ultrasonic probe 2 and the shaft to be measured, and improving the accuracy of the detection result.

[0042] Until the transmission belt 13 contacts the smooth surface of the shaft to be measured again, the friction force between the transmission belt 13 and the shaft to be measured recovers to the initial value. At this time, the torsion spring drives the left connecting shaft 12 to rotate in the opposite direction, and then drives the push plate 20 to reset to the initial position through the transmission of other parts, so as to reduce the flow area of ​​the ball valve 18, reduce the volume of the coupling agent flowing out of the nozzle 181 per unit time, and avoid wasting the coupling agent.

[0043] After the inspection of the first gear is completed, the staff shuts down the inspection host and the conveying module, and performs flaw detection on the next gear shaft according to the above operation.

[0044] Furthermore, Figure 2 and Fig.13As shown, it also includes: an elastic telescopic plate 21, having two symmetrically distributed front and back, both fixed to the left side of the mounting shell 1, the two elastic telescopic plates 21 are respectively located on both sides of the nozzle 181, and the two elastic telescopic plates 21 are both squeezed and matched with the shaft to be measured, and the elastic telescopic plate 21 is used to shield the coupling agent on the shaft to be measured, reduce the flow speed of the coupling agent, and thereby increase the residence time of the coupling agent between the two elastic telescopic plates 21, and the lower side surface of the telescopic portion of the elastic telescopic plate 21 is initially located below the lower side surface of the mounting shell 1, and when the elastic telescopic plate 21 moves to contact the surface of the shaft to be measured, the mounting shell 1 does not contact the shaft to be measured, and at the same time, in the subsequent movement process, the shaft to be measured squeezes the telescopic end of the elastic telescopic plate 21, so that the telescopic end of the elastic telescopic plate 21 is squeezed and moves toward its fixed portion.

[0045] In the process of the mounting shell 1 contacting the shaft to be measured, the mounting shell 1 drives the two elastic retractable plates 21 to move synchronously, and the retractable ends of the two elastic retractable plates 21 first contact the surface of the gear shaft with the mounting shell 1. After the retractable ends of the two elastic retractable plates 21 contact the surface of the gear shaft, the gear shaft squeezes the retractable ends of the two elastic retractable plates 21, so that the retractable ends of the two elastic retractable plates 21 move into their fixed parts respectively, until the mounting shell 1 contacts the gear shaft, and the retractable ends of the two elastic retractable plates 21 stop moving synchronously.

[0046] When the nozzle 181 sprays the coupling agent onto the gear shaft, the two elastic retractable plates 21 intercept the coupling agent, reduce the flow rate of the coupling agent, and increase the residence time of the coupling agent on the left side of the mounting shell 1, so as to avoid the coupling agent flowing quickly along the surface of the gear shaft, resulting in too little volume of the coupling agent on the left side of the mounting shell 1, thereby increasing the accuracy of the detection result and preventing the coupling agent from flowing along the gear shaft to the position in contact with the transmission belt 13, thereby reducing the friction between the transmission belt 13 and the surface of the gear shaft, and thus making it impossible for the transmission belt 13 to rotate normally, even affecting the accuracy of the mounting shell 1 when detecting the rough surface of the gear shaft.

[0047] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gearbox gear shaft flaw detection device, characterized in that: include: An installation shell (1), wherein a detection host is provided on one side of the installation shell (1); An ultrasonic probe (2) is installed inside the installation shell (1), and the ultrasonic probe (2) is electrically connected to the detection host; The positioning frames (3) have two groups that are symmetrically distributed and are both rotatably connected to the mounting shell (1). The number of the positioning frames (3) in each group is two. The two positioning frames (3) are centrally symmetrically distributed. The positioning frames (3) are rotatably connected to a fixed shaft (31); The first liquid storage shell (5) has two symmetrically distributed shells, each of which is fixedly connected to the adjacent fixed shafts (31); a connecting shell (6) is slidably connected inside the first liquid storage shell (5); and the connecting shell (6) is fixedly connected to the adjacent fixed shafts (31); The first piston rod (7) has two symmetrically distributed first and second liquid storage shells (5) respectively connected in a sliding manner to different first liquid storage shells (5); the first piston rod (7) slides in the adjacent connecting shell (6); the first piston rod (7) and the adjacent connecting shell (6) are both provided with symmetrically distributed arc-shaped through holes; the symmetrically distributed arc-shaped through holes on the first piston rod (7) are connected and matched with adjacent arc-shaped through holes on the adjacent connecting shell (6); The drive components have two symmetrically distributed components, which are respectively arranged on different connecting shells (6), and the drive components are used to change the flow area of ​​the symmetrically distributed arc-shaped through holes on the connecting shell (6).

2. A gearbox gear shaft flaw detection device according to claim 1, characterized in that: The drive assembly comprises: A drive ring (8) threadedly connected to one end of the adjacent connecting shell (6) close to the adjacent fixed shaft (31); A connecting ring (9) is rotatably connected to the driving ring (8), a limiting pin is fixedly connected inside the connecting ring (9), the connecting shell (6) is provided with a slide groove, the limiting pin on the connecting ring (9) slides in the slide groove of the adjacent connecting shell (6), a limiting groove (10) is provided at one end of the first piston rod (7) close to the adjacent fixed shaft (31), and the limiting pin on the connecting ring (9) slides in the adjacent limiting groove (10).

3. A gearbox gear shaft flaw detection device according to claim 2, characterized in that: The contact portion between the limit pin on the connecting ring (9) and the adjacent first piston rod (7) is arranged as a curved surface, so as to reduce the friction between the limit pin and the first piston rod (7).

4. A gearbox gear shaft flaw detection device according to claim 2, characterized in that: The limiting groove (10) is arc-shaped, and the angle corresponding to its projection on the adjacent first piston rod (7) is not less than the angle of the arc-shaped through hole on the first piston rod (7).

5. A gearbox gear shaft flaw detection device according to claim 4, characterized in that: The angle of the symmetrically distributed arc-shaped through holes on the connecting shell (6) and the angle of the symmetrically distributed arc-shaped through holes on the first piston rod (7) are both no greater than 90°.

6. The gearbox gear shaft flaw detection device according to claim 1, characterized in that: Also includes: A detection mechanism is arranged on the mounting shell (1), the detection mechanism is used to detect the roughness of the surface of the shaft to be tested, and the detection mechanism comprises: The connecting seats (11) have two symmetrically distributed ones, which are respectively connected to the adjacent positioning frames (3) in a penetrating manner. The positioning frame (3) provided with the connecting seats (11) is provided with a moving module, and the moving module is used to drive the connecting seats (11) on the same positioning frame (3) to move; The connecting shafts (12) have two symmetrically distributed ones, which are rotatably connected to adjacent connecting seats (11) respectively, the symmetrically distributed connecting shafts (12) are commonly wound with a transmission belt (13), and the connecting seat (11) and the connecting shafts (12) thereon are commonly provided with a torsion spring; The second liquid storage shell (14) is fixedly connected to one of the connecting seats (11) via a connecting piece. A second piston rod (15) is slidably connected to the interior of the second liquid storage shell (14). The second piston rod (15) is threadedly connected to the adjacent connecting shaft (12). The second piston rod (15) is used to squeeze the liquid in the second liquid storage shell (14). A coating component is provided on one side of the mounting shell (1), and the coating component is used to coat a coupling agent onto the surface of the shaft to be measured.

7. A gearbox gear shaft flaw detection device according to claim 6, characterized in that: The coating assembly comprises: A ball valve (18) is fixedly connected to one side of the mounting shell (1), and two ports of the ball valve (18) are respectively fixedly connected to and communicated with a feed pipe (171) and a nozzle (181), the feed pipe (171) is externally connected to a conveying module, the conveying module is used to convey a coupling agent into the feed pipe (171), and the nozzle (181) is used to spray the coupling agent onto the shaft to be tested; A drive tube (19) is fixedly connected to a side of the mounting shell (1) close to the feed tube (171); a push plate (20) is slidably connected inside the drive tube (19); the drive tube (19) is connected to the second liquid storage shell (14) via a connecting tube; the push plate (20) and the rotating shaft of the ball valve (18) are jointly provided with an adjustment module, and the adjustment module is used to change the flow area of ​​the ball valve (18).

8. The gearbox gear shaft flaw detection device according to claim 7, characterized in that: The thickness of the transmission belt (13) decreases gradually from the middle to both sides.

9. The gearbox gear shaft flaw detection device according to claim 7, characterized in that: Also includes: The elastic expansion plates (21) have two symmetrically distributed plates, both of which are fixed to a side of the mounting shell (1) close to the discharge pipe (171), and the symmetrically distributed elastic expansion plates (21) are respectively located on both sides of the nozzle (181).

10. A gearbox gear shaft flaw detection device according to claim 9, characterized in that: The lower side surface of the telescopic portion of the elastic telescopic plate (21) is located below the lower side surface of the mounting shell (1).

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