Eddy current detection device of variable-diameter shaft

Abstract

The utility model provides an eddy current testing device for a variable-diameter shaft, which comprises a probe movement control mechanism, a probe clamping mechanism, a probe library, a sample block library and a workpiece rotating table, and the probe library, the sample block library and the workpiece rotating table are arranged corresponding to the movement track of the probe movement control mechanism; the probe library is provided with a plurality of probe fixing rings for storing eddy current probes, the sample block library comprises a mounting vertical plate and a plurality of profiling test blocks assembled on the mounting vertical plate, and the workpiece rotating table comprises a first rotating table and a workpiece clamp mounted on the first rotating table; and the probe movement control mechanism is connected with the probe clamping mechanism so as to drive the probe clamping mechanism to be switched among the probe library, the sample block library and the workpiece rotating table. And the mechanical detection of the variable-diameter shaft can be realized.

Description

Technical Field

[0001] This utility model relates to the field of eddy current testing of variable diameter shafts, and specifically to an eddy current testing device for variable diameter shafts. Background Technology

[0002] Eddy current testing is a non-destructive testing method that utilizes the principle of electromagnetic induction to non-destructively evaluate certain properties of conductive materials and workpieces, or to detect defects, by measuring changes in induced eddy currents within the workpiece under inspection. It is one of the more commonly used testing methods. Existing technologies also include schemes for performing eddy current testing on workpieces using mechanized equipment. In the field of eddy current testing for aero-engines, existing automatic eddy current testing technology is limited to the automatic inspection of aero-engine disks and blades. However, for the inspection of variable-diameter shafts (i.e., shafts with varying inner or outer diameters), it is necessary to inspect different positions on the variable-diameter shaft. Therefore, different eddy current probes need to be replaced, and the sensitivity needs to be calibrated each time a probe is replaced. Currently, there is no mechanized eddy current testing device specifically for variable-diameter shafts. Utility Model Content

[0003] To address the aforementioned problems, this invention provides an eddy current detection device for a variable diameter shaft.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] An eddy current testing device for a variable diameter shaft includes a probe movement control mechanism, a probe clamping mechanism, a probe library, a sample block library, and a workpiece rotary table. The probe library, sample block library, and workpiece rotary table are configured to correspond to the movement trajectory of the probe movement control mechanism. The probe library has multiple probe fixing rings for storing eddy current probes. The sample block library includes a mounting plate and multiple contoured test blocks mounted on the mounting plate. The workpiece rotary table includes a first rotary table and a workpiece clamp mounted on the first rotary table. The probe movement control mechanism is connected to the probe clamping mechanism to drive the probe clamping mechanism to switch between the probe library, sample block library, and workpiece rotary table.

[0006] Furthermore, the probe movement control mechanism is a three-axis movement mechanism capable of moving in the XYZ three-axis directions. The probe library, sample library, and workpiece rotary table are located below the probe movement control mechanism and are arranged sequentially along the X-axis horizontal movement direction of the three-axis movement mechanism. The probe clamping mechanism is installed on the Z-axis lifting unit of the three-axis movement mechanism.

[0007] Furthermore, the Z-axis lifting unit of the three-axis moving mechanism includes a vertically arranged vertical slide rail, a slider that can be slidably fitted on the vertical slide rail, a lifting driver installed on the upper end of the vertical slide rail and connected to the slider, and a guide sleeve installed on the lower end of the vertical slide rail. The probe clamping mechanism includes a vertical rod and a clamping device installed on the lower end of the vertical rod. The vertical rod is sleeved in the guide sleeve, and its upper end is connected to the slider.

[0008] Furthermore, the probe magazine also includes a second rotating stage and a mounting plate mounted on the second rotating stage, with multiple probe retaining rings fixed to the outer periphery of the mounting plate.

[0009] Furthermore, the eddy current probe has a mounting head, and at least three support rods are provided on the outer periphery of the mounting head. At least three positioning grooves are provided on the upper surface of the probe fixing ring. The support rods of the mounting head are positioned in the positioning grooves of the probe fixing ring, thereby storing the eddy current probe.

[0010] Furthermore, a clearance notch is provided on the outer side of the probe fixing ring to allow the eddy current probe to move outward from the clearance notch side.

[0011] Furthermore, the eddy current probe includes a mounting head, a pneumatic telescopic device connected to the mounting head, and a detection head mounted on the pneumatic telescopic device. The mounting head has a vent hole, and the pneumatic telescopic device is connected to the vent hole of the mounting head through an air pipe. The clamping device of the probe clamping mechanism has an air passage for cooperating with the vent hole of the mounting head, and the air passage is connected to an air source device.

[0012] Furthermore, the workpiece fixture of the workpiece rotary table includes a clamp and a gripper. The clamp is located at the bottom of the gripper. The clamp is used to clamp the bottom of the workpiece, and the gripper is used to hold the waist of the workpiece so that the workpiece is placed vertically.

[0013] Furthermore, it also includes a workpiece placement rack and a material handling robot arm, which is located between the workpiece rotary table and the workpiece placement rack.

[0014] Furthermore, it also includes a control system, which is at least connected to the probe movement control mechanism, the probe clamping mechanism, the probe magazine, and the workpiece rotary table to control the coordinated operation of the above-mentioned parts.

[0015] The technical solution provided by this utility model has the following beneficial effects:

[0016] The scheme of this application uses a probe library to store various eddy current probes, a sample block library to hold different contour test blocks, and a workpiece rotary table to hold workpieces (i.e., variable diameter shafts). The probe movement control mechanism drives the probe clamping mechanism to clamp the selected eddy current probe from the probe library, and then transfers it to the sample block library for verification with a suitable contour test block. After verification, the probe is transferred to the workpiece rotary table for inspection, thus realizing mechanized operation. Attached Figure Description

[0017] Figure 1 The diagram shown is a partial structural schematic of the eddy current detection device for the variable diameter shaft in this embodiment. Figure 1 ;

[0018] Figure 2 The diagram shown is a partial structural schematic of the eddy current detection device for the variable diameter shaft in this embodiment. Figure 2 ;

[0019] Figure 3 The diagram shown is a partial structural schematic of the eddy current detection device for the variable diameter shaft in this embodiment. Figure 3 ;

[0020] Figure 4 As shown Figure 3 Enlarged view of region A in the middle;

[0021] Figure 5 The diagram shown is a partial structural schematic of the eddy current detection device for the variable diameter shaft in this embodiment. Figure 4 ;

[0022] Figure 6 The diagram shown is a structural schematic of the eddy current detection device for the variable diameter shaft in the embodiment. Detailed Implementation

[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 6 As shown, this embodiment provides an eddy current testing device for a variable diameter shaft, including a probe movement control mechanism 10, a probe clamping mechanism 30, a probe library 20, a sample library 40, and a workpiece rotary table 50. The probe library 20, the sample library 40, and the workpiece rotary table 50 are set to correspond to the movement trajectory of the probe movement control mechanism 10. The probe library 20 has multiple probe fixing rings 23 for storing eddy current probes 1, wherein one eddy current probe 1 is placed on each probe fixing ring 23. Different eddy current probes 1 have different shapes, such as the end tilting upwards or the end extending horizontally, to adapt to the detection of different positions. The sample block library 40 includes a mounting plate 41 and multiple contoured test blocks 42 mounted on the mounting plate 41. The contoured test blocks 42 are modeled after the shape of the part to be tested on the workpiece 2 and have artificially set defects for detection by the eddy current probe 1. The workpiece rotary table 50 includes a first rotary table 51 and a workpiece clamp 52 mounted on the first rotary table 51. The probe movement control mechanism 10 is connected to the probe clamping mechanism 30 to drive the probe clamping mechanism 30 to switch between the probe library 20, the sample block library 40 and the workpiece rotary table 50.

[0027] Specifically, during the operation, the workpiece 2 (i.e., the variable diameter shaft) is placed on the workpiece rotary table 50. The probe movement control mechanism 10 moves the probe clamping mechanism 30 to the position of the corresponding probe magazine 20, where the probe clamping mechanism 30 clamps the corresponding eddy current probe 1. Then, the probe movement control mechanism 10 moves the probe clamping mechanism 30 to the position of the corresponding sample magazine 40, allowing the eddy current probe 1 to be calibrated against the corresponding conformal test block 42, thus verifying the sensitivity of the eddy current probe 1. Finally, the probe movement control mechanism 10 moves the probe clamping mechanism 30 to the position of the corresponding workpiece rotary table 50 to inspect the workpiece 2 on the workpiece rotary table 50. When the inspection of the current position is completed, and the inspection of the next position is required, the probe movement control mechanism 10 moves the probe clamping mechanism 30 back to the position of the corresponding probe magazine 20 to replace the corresponding eddy current probe 1. This process is repeated until all positions of the workpiece 2 have been inspected. This achieves mechanized inspection of the variable diameter shaft, offering high precision and efficiency.

[0028] Specifically, in this embodiment, the probe movement control mechanism 10 is a three-axis movement mechanism capable of moving in the XYZ axes. It specifically includes an X-axis movement unit 11 extending in the front-back direction, a Y-axis movement unit 12 extending in the left-right direction, and a Z-axis lifting unit 13 extending in the vertical direction. The drive end of the X-axis movement unit 11 is connected to the Y-axis movement unit 12 to drive the Y-axis movement unit 12 to move back and forth. The drive end of the Y-axis movement unit 12 is connected to the Z-axis lifting unit 13 to drive the Z-axis lifting unit 13 to move left and right. The probe clamping mechanism 30 is mounted on the Z-axis lifting unit 13 of the three-axis movement mechanism 10. The probe storage 20, the sample storage 40, and the workpiece rotary table 50 are located below the probe movement control mechanism 10 and are arranged sequentially along the horizontal movement direction of the X-axis (i.e., the front-back extension direction). Thus, the X-axis moving unit 11 drives the probe clamping mechanism 30 to switch between the probe magazine 20, the sample magazine 40, and the workpiece rotary table 50; the Y-axis moving unit 12 drives the probe clamping mechanism 30 to move left and right to adjust its position; the Z-axis lifting unit 13 drives the probe clamping mechanism 30 to rise and fall. This allows the probe clamping mechanism 30 to accurately complete the clamping, calibration, and testing of the eddy current probe 1. The X-axis moving unit 11 and the Y-axis moving unit 12 are existing technologies, such as using a motor, lead screw, and slider to achieve translation.

[0029] Since the eddy current probe 1 needs to be precisely inserted into the inner hole of the variable diameter shaft for detection, the Z-axis lifting unit 13 needs to be improved to achieve precise lifting. In this embodiment, the Z-axis lifting unit 13 of the three-axis moving mechanism includes a vertically arranged vertical slide rail 131, a slider 132 slidably fitted on the vertical slide rail 131, a lifting driver 133 installed on the upper end of the vertical slide rail 131 and connected to the slider 132, and a guide sleeve 134 installed on the lower end of the vertical slide rail 131. The probe clamping mechanism 30 includes a vertical rod 31 and a clamping device 32 installed on the lower end of the vertical rod 31. The clamping device 32 is used to clamp the eddy current probe 1. The vertical rod 31 is sleeved in the guide sleeve 134, and its upper end is connected to the slider 132. In this way, the Z-axis lifting unit 13 can drive the probe clamping mechanism 30 to lift stably, which can effectively prevent shaking and make the detection more accurate.

[0030] The probe storage 20 also includes a second rotating platform 21 and a mounting plate 22 mounted on the second rotating platform 21. Multiple probe fixing rings 23 are fixed to the outer periphery of the mounting plate 22. Different eddy current probes 1 are switched to a specific clamping position by rotating the mounting plate 22 driven by the second rotating platform 21. The structure is simple and the switching is precise. Of course, in other embodiments, the switching can be performed without rotation. Alternatively, the positions of the multiple probe fixing rings 23 can be fixed.

[0031] Furthermore, the eddy current probe 1 has a mounting head. In this embodiment, the eddy current probe 1 specifically includes a mounting head 3 and a detection head 4 connected to the mounting head 3. The detection head 4 of different types of eddy current probes 1 has different shapes to adapt to detection at different positions. The outer periphery of the mounting head 3 is provided with at least three support rods 5. In this embodiment, there are three support rods 5. The upper surface of the probe fixing ring 23 is provided with at least three positioning grooves 231. In this embodiment, there are three positioning grooves 231. The support rods 5 of the mounting head 3 are positioned in the positioning grooves 231 of the probe fixing ring 23, thereby storing the eddy current probe 1. This can effectively position the eddy current probe 1 and prevent it from dislodging and falling off during movement and switching. At the same time, the outer side of the probe fixing ring 23 is provided with a clearance notch 232 so that the eddy current probe 1 can be moved outward from the clearance notch 232. That is, after the clamping device 32 of the probe clamping mechanism 30 clamps the corresponding eddy current probe 1, it can be moved out from the side.

[0032] Furthermore, the clamping method of the clamping device 32 of the probe clamping mechanism 30 and the mounting head 3 of the eddy current probe 1 can be clamping and fixing with a claw clamp, snap-fit ​​fixing or magnetic attraction fixing, as long as the clamping device 32 and the mounting head 3 can be fixed.

[0033] Meanwhile, in other embodiments, the detection head 4 of the eddy current probe 1 can also be a telescopic structure. A telescopic structure is suitable for insertion into the inner hole of a variable-diameter shaft for detection. When a narrow passage is needed, the detection head 4 can be retracted; when detection is required, the detection head 4 can be extended. Specifically, one way to implement this telescopic structure is as follows: the eddy current probe 1 includes a mounting head 3, a pneumatic telescopic device (not shown) connected to the mounting head 3, and a detection head 4 mounted on the pneumatic telescopic device. The mounting head 3 has a vent hole, and the pneumatic telescopic device is connected to the vent hole of the mounting head 3 via an air pipe. The clamping device 32 of the probe clamping mechanism 30 has an air passage for cooperating with the vent hole of the mounting head 3, and the air passage is connected to an air source device. The extension and retraction of the telescopic device is controlled by charging and discharging the air from the air source device, thereby controlling the extension and retraction of the detection head 4. Of course, the method of implementing the extension and retraction of the detection head 4 is not limited to this; an electric telescopic rod can also be used for driving, etc.

[0034] Specifically, the workpiece fixture 52 of the workpiece rotary table 50 includes a clamp 53 and a gripper 54. The clamp 53 is located at the bottom of the gripper 54. The clamp 53 is used to clamp the bottom of the workpiece 2, and the gripper 54 is used to hold the waist of the workpiece 2 so that the workpiece 2 is placed vertically and the positioning effect is good. In this way, the probe movement control mechanism 10 can drive the eddy current probe 1 to extend into the inner hole of the workpiece 2 from above for detection. At the same time, the rotation of the workpiece rotary table 50 causes the workpiece to rotate, realizing 360° detection of the inner wall.

[0035] Furthermore, the system also includes a workpiece placement rack 70 and a picking and placing robotic arm 60, located between the workpiece rotary table 50 and the workpiece placement rack 70. The picking and placing robotic arm 60 loads and unloads workpieces; that is, it picks up workpiece 2 from the workpiece placement rack 70 and places it on the workpiece rotary table 50. Upon completion of inspection, it picks up workpiece 2 from the workpiece rotary table 50 and places it on the workpiece placement rack 70. Specifically, the picking and placing robotic arm 60 uses an existing robotic arm to achieve mechanized loading and unloading. Specifically, in this embodiment, the workpiece placement rack 70 is a handcart, facilitating personnel to change, load, and transfer workpiece 2. Of course, in other embodiments, the picking and placing robotic arm 60 may not be used.

[0036] More preferably, the system also includes a control system connected to the probe movement control mechanism 10, the probe clamping mechanism 30, the probe magazine 20, the workpiece rotary table 50, and the loading / unloading robotic arm 60, to control the coordinated operation of these components. Specifically, the control system can be a PLC control system from the prior art, which enables automated coordinated operation.

[0037] Furthermore, as in this embodiment, the work area is divided into a working area and an operation area. The working area consists of a probe movement control mechanism 10, a probe clamping mechanism 30, a probe storage 20, a sample storage 40, a workpiece rotary table 50, and a material handling robot arm 60. The working area is surrounded by a fence 90. The operation area is located outside the fence 90 and includes a human-machine interaction module 81 (such as an operating computer) and a power distribution cabinet 82. This isolation method ensures safe operation.

[0038] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An eddy current detection device for a variable diameter shaft, characterized in that: The device includes a probe movement control mechanism, a probe clamping mechanism, a probe library, a sample block library, and a workpiece rotary table. The probe library, sample block library, and workpiece rotary table are configured to correspond to the movement trajectory of the probe movement control mechanism. The probe library has multiple probe fixing rings for storing eddy current probes. The sample block library includes a mounting plate and multiple contoured test blocks mounted on the mounting plate. The workpiece rotary table includes a first rotary table and a workpiece fixture mounted on the first rotary table. The probe movement control mechanism is connected to the probe clamping mechanism to drive the probe clamping mechanism to switch between the probe library, sample block library, and workpiece rotary table.

2. The eddy current detection device for a variable diameter shaft according to claim 1, characterized in that: The probe movement control mechanism is a three-axis movement mechanism capable of moving in the XYZ axes. The probe library, sample library, and workpiece rotary table are located below the probe movement control mechanism and are arranged sequentially along the X-axis horizontal movement direction of the three-axis movement mechanism. The probe clamping mechanism is installed on the Z-axis lifting unit of the three-axis movement mechanism.

3. The eddy current detection device for a variable diameter shaft according to claim 2, characterized in that: The Z-axis lifting unit of the three-axis moving mechanism includes a vertically arranged vertical slide rail, a slider that can be slidably fitted on the vertical slide rail, a lifting driver installed on the upper end of the vertical slide rail and connected to the slider, and a guide sleeve installed on the lower end of the vertical slide rail. The probe clamping mechanism includes a vertical rod and a clamping device installed on the lower end of the vertical rod. The vertical rod is sleeved in the guide sleeve, and its upper end is connected to the slider.

4. The eddy current detection device for a variable diameter shaft according to claim 1, characterized in that: The probe library also includes a second rotating stage and a mounting plate mounted on the second rotating stage, with multiple probe retaining rings fixed to the outer periphery of the mounting plate.

5. The eddy current detection device for a variable diameter shaft according to claim 1 or 4, characterized in that: The eddy current probe has a mounting head with at least three support rods on its outer periphery. The upper surface of the probe fixing ring has at least three positioning grooves. The support rods of the mounting head are positioned in the positioning grooves of the probe fixing ring, thereby storing the eddy current probe.

6. The eddy current detection device for a variable diameter shaft according to claim 1 or 4, characterized in that: The outer side of the probe fixing ring is provided with a clearance notch so that the eddy current probe can be moved outward from the clearance notch side.

7. The eddy current detection device for a variable diameter shaft according to claim 1 or 4, characterized in that: The eddy current probe includes a mounting head, a pneumatic telescopic device connected to the mounting head, and a detection head mounted on the pneumatic telescopic device. The mounting head has a vent hole, and the pneumatic telescopic device is connected to the vent hole of the mounting head through an air pipe. The clamping device of the probe clamping mechanism has an air passage for cooperating with the vent hole of the mounting head, and the air passage is connected to an air source device.

8. The eddy current detection device for a variable diameter shaft according to claim 1, characterized in that: The workpiece fixture of the workpiece rotary table includes a clamp and a gripper. The clamp is located at the bottom of the gripper and is used to clamp the bottom of the workpiece. The gripper is used to hold the waist of the workpiece so that the workpiece is placed vertically.

9. The eddy current detection device for a variable diameter shaft according to claim 1, characterized in that: It also includes a workpiece placement rack and a picking and placing robotic arm, which is located between the workpiece rotary table and the workpiece placement rack.

10. The eddy current detection device for a variable diameter shaft according to claim 1, characterized in that: It also includes a control system, which is at least connected to the probe movement control mechanism, the probe clamping mechanism, the probe magazine and the workpiece rotary table, in order to control the coordinated operation of the above-mentioned parts.

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