Magnetic flux leakage flaw detection device for axial microcracks on inner wall of quenched cylindrical workpiece
A magnetic flux leakage probe system for quenched steel pipes enables accurate defect detection by rotating and temperature-controlled cooling, addressing the limitations of ultrasonic probes and preventing cracking.
Patent Information
- Application Number
- CN202421428459.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-06-20
AI Technical Summary
In the prior art, ultrasonic flaw detection probes are not suitable for flaw detection of the inner surface of steel pipes after quenching, and the cooling process may expand the risk of quenching and cracking. A device that can accurately detect axial microcracks in the inner wall of the steel pipe at high temperatures is needed.
A magnetic leakage detection device for the inner wall of a quenched cylindrical workpiece is designed, including a rotating tug, a magnetic leakage probe, a temperature measurement mechanism and a cooling mechanism. The magnetic leakage probe is used to detect the inner wall of the steel pipe at high temperature, and the probe is ensured to be safe and prevent damage through the temperature measurement and cooling mechanism.
It realizes accurate identification of microcracks on the inner wall of the quenched steel pipe at high temperatures, avoids batch quenching and cracking, reduces the impact of production rhythm caused by frequent specification replacement, and improves flaw detection efficiency and accuracy.
Smart Images
Figure CN223107710U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical manufacturing, and particularly relates to a magnetic flux leakage detection device for axial microcracks on the inner wall of a cylindrical workpiece after quenching. Background Art
[0002] Medium carbon alloy steel pipes are prone to quenching cracking, mainly showing longitudinal defects on the inner wall. When formulating heat treatment processes, measures such as increasing the steel temperature after quenching water outlet, controlling the inner water spray flow rate and pressure during quenching are often taken to reduce the cracking tendency on the premise of ensuring tissue transformation. Under the same control conditions of inner water spray flow rate and pressure, the water outlet steel temperature is generally controlled at 100 - 200°C.
[0003] In the prior art, ultrasonic flaw detectors are usually used to detect steel pipes. Since the working temperature of ultrasonic flaw detectors is below 100°C, if an ultrasonic flaw detector is used to detect the inner surface of a steel pipe, water or coupling agent needs to be added at the contact part between the ultrasonic flaw detector and the steel pipe. Water or coupling agent is easy to evaporate at high temperatures, and the steel pipe can only be cooled to room temperature before flaw detection. Cooling the steel pipe to room temperature will further increase the risk of quenching cracking. Therefore, ultrasonic flaw detection is not suitable for steel pipes after quenching.
[0004] Therefore, a magnetic flux leakage detection device for axial microcracks on the inner wall of a cylindrical workpiece after quenching is needed. Content of the Utility Model
[0005] The purpose of the utility model is to provide a magnetic flux leakage detection device for axial microcracks on the inner wall of a cylindrical workpiece after quenching, which can accurately detect longitudinal inner wall defects that occur after quenching of the steel pipe and avoid batch quenching cracking.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] A magnetic flux leakage detection device for axial microcracks on the inner wall of a cylindrical workpiece after quenching, comprising:
[0008] A rotating drag wheel, on which the cylindrical workpiece is placed, and the rotating drag wheel can drive the cylindrical workpiece to rotate.
[0009] A magnetic flux leakage probe, which can enter the inside of the cylindrical workpiece for flaw detection.
[0010] A temperature measuring mechanism, which is placed at the front end of the magnetic flux leakage probe, and the temperature measuring mechanism can detect the temperature of the inner wall of the cylindrical workpiece before flaw detection.
[0011] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, the magnetic flux leakage probe can open during flaw detection, so that the magnetic flux leakage probe can contact the inner wall of the cylindrical workpiece. The magnetic flux leakage probe can move axially along the cylindrical workpiece, and flaw detection of the cylindrical workpiece is carried out while the magnetic flux leakage probe moves axially.
[0012] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, a cooling mechanism is further included. The cylindrical workpiece can be placed on the cooling mechanism, and the cylindrical workpiece can rotate on the cooling mechanism. The cooling mechanism is used to cool the cylindrical workpiece.
[0013] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, a turning hook is further included, and the turning hook can turn the cylindrical workpiece onto the rotating drag wheel.
[0014] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, before flaw detection, the temperature measuring mechanism is used to detect the temperature of the inner wall of the cylindrical workpiece. When the temperature of the inner wall of the cylindrical workpiece does not meet the flaw detection requirements, the turning hook is used to turn the cylindrical workpiece on the rotating drag wheel onto the cooling mechanism, the cooling mechanism is turned on to cool the cylindrical workpiece, and the turning hook is used to turn the cooled cylindrical workpiece onto the rotating drag wheel.
[0015] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, the cooling mechanism can cool multiple cylindrical workpieces simultaneously. The cooling mechanism uses an aerosol cooling method, and the cooling speed is between air cooling and water cooling.
[0016] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, a roller path is further included for transporting the cylindrical workpiece, and the turning hook turns the cylindrical workpiece from the roller path onto the rotating drag wheel.
[0017] Furthermore, in the above-mentioned magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of the quenched cylindrical workpiece, when the temperature measuring mechanism detects that the temperature of the inner wall of the cylindrical workpiece is higher than the maximum temperature that the magnetic flux leakage probe can withstand, the temperature measuring mechanism can give an alarm and the magnetic flux leakage probe withdraws from the cylindrical workpiece.
[0018] Analysis shows that a magnetic flux leakage detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece. This device uses a magnetic flux leakage probe to detect the inner wall of the quenched cylindrical workpiece. The cylindrical workpiece rotates in place, and after the magnetic flux leakage probe opens, it fits with the inner wall of the cylindrical workpiece. During operation, the magnetic flux leakage probe moves axially inside the cylindrical workpiece to accurately identify defects on the inner wall of the cylindrical workpiece. The cooling mechanism cools the cylindrical workpiece that does not meet the temperature requirements to ensure that the temperature of the inner wall of the cylindrical workpiece is lower than the maximum temperature that the magnetic flux leakage probe can withstand, preventing damage to the magnetic flux leakage probe. The magnetic flux leakage probe adapts to the inner hole of the cylindrical workpiece, reducing the impact on the production rhythm caused by frequent replacement of specifications during production. Description of the Drawings
[0019] The schematic drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:
[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.
[0021] Description of the reference numerals: 1 cylindrical workpiece; 2 rotating idler wheel; 3 magnetic flux leakage probe; 4 cooling mechanism. Detailed Embodiment
[0022] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present utility model rather than a limitation thereof. In fact, those skilled in the art will clearly understand that modifications and variations can be made to the present utility model without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Therefore, it is desirable that the present utility model includes such modifications and variations that fall within the scope of the appended claims and their equivalents.
[0023] In the description of the present utility model, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The terms "connected", "connected to", and "arranged" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component; it can be a wired connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0024] One or more examples of the present utility model are shown in the accompanying drawings. The detailed description uses numerical and alphabetical markings to refer to features in the drawings. Similar or like markings in the drawings and the description have been used to refer to similar or like parts of the present utility model. As used herein, terms such as "first", "second", and "third" are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.
[0025] As Figure 1 shown, according to an embodiment of the present utility model, there is provided a magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a cylindrical workpiece after quenching, comprising:
[0026] A rotating drag wheel 2, on which the cylindrical workpiece 1 is placed, and the rotating drag wheel 2 can drive the cylindrical workpiece 1 to rotate.
[0027] A magnetic flux leakage probe 3, which can enter the interior of the cylindrical workpiece 1 for flaw detection.
[0028] A temperature measuring mechanism, which is placed at the front end of the magnetic flux leakage probe 3 and can detect the temperature of the inner wall of the cylindrical workpiece 1 before flaw detection.
[0029] In an embodiment of the present utility model, the cylindrical workpiece 1 is a steel pipe. Before flaw detection of the cylindrical workpiece 1, first, the temperature measuring mechanism is used to detect the temperature of the inner wall of the cylindrical workpiece 1 to ensure that the temperature of the inner wall of the cylindrical workpiece 1 is lower than the maximum temperature that the magnetic flux leakage probe 3 can withstand. When flaw detecting the cylindrical workpiece 1, the rotating drag wheel 2 drives the cylindrical workpiece 1 to rotate in place, the magnetic flux leakage probe 3 enters the interior of the cylindrical workpiece 1, the magnetic flux leakage probe 3 does not rotate, and the magnetic flux leakage probe 3 is used to flaw detect the inner wall of the cylindrical workpiece 1 to accurately identify inner wall defects.
[0030] Furthermore, the magnetic flux leakage probe 3 can open during flaw detection, so that the magnetic flux leakage probe 3 can be in full contact with the inner wall of the cylindrical workpiece 1. The magnetic flux leakage probe 3 can move axially along the cylindrical workpiece 1, and flaw detect the cylindrical workpiece 1 while moving axially. Such a setting can make the magnetic flux leakage probe 3 adapt to the inner hole of the cylindrical workpiece 1, so that the device can be applied to cylindrical workpieces 1 of various specifications, and reduce the impact on the rhythm of continuous production caused by frequent replacement of the specifications of the cylindrical workpiece 1 during production. During the process of the magnetic flux leakage probe 3 slowly moving axially along the cylindrical workpiece 1, flaw detect the inner wall of the cylindrical workpiece 1 to accurately identify inner wall defects.
[0031] Further, it further includes a cooling mechanism 4. The cylindrical workpiece 1 can be placed on the cooling mechanism 4 and can rotate on the cooling mechanism 4. The cooling mechanism 4 is used to cool the cylindrical workpiece 1. The cooling mechanism 4 is used to cool the cylindrical workpiece 1 to ensure that the temperature of the inner wall of the cylindrical workpiece 1 is lower than the maximum temperature that the magnetic flux leakage probe 3 can withstand, preventing damage to the magnetic flux leakage probe 3.
[0032] Further, it further includes a turning hook that can turn the cylindrical workpiece 1 onto the rotating idler 2.
[0033] Further, the device is provided with a flaw detection level and a cooling level. The rotating idler 2 and the magnetic flux leakage probe 3 are both arranged at the flaw detection level, and the cooling mechanism 4 is arranged at the cooling level. The cylindrical workpiece 1 can move between the flaw detection level and the cooling level. Before flaw detection, the magnetic flux leakage probe 3 extends into the inner hole of the cylindrical workpiece 1, and the temperature measuring mechanism is used to detect the temperature of the inner wall of the cylindrical workpiece 1. When the temperature of the inner wall of the cylindrical workpiece 1 meets the flaw detection requirements, the magnetic flux leakage probe 3 is used to detect the inner wall of the cylindrical workpiece 1. When the temperature of the inner wall of the cylindrical workpiece 1 does not meet the flaw detection requirements, the turning hook is used to turn the cylindrical workpiece 1 on the rotating idler 2 onto the cooling mechanism 4, and the cooling mechanism 4 is turned on to cool the cylindrical workpiece 1 until it is cooled below the maximum temperature that the magnetic flux leakage probe 3 can withstand. Then, the turning hook is used to turn the cooled cylindrical workpiece 1 onto the rotating idler 2, and the magnetic flux leakage probe 3 is used to detect the inner wall of the cylindrical workpiece 1 again.
[0034] Further, the cooling mechanism 4 can cool multiple cylindrical workpieces 1 simultaneously. The cooling mechanism 4 uses an aerosol cooling method, and the cooling speed is between air cooling and water cooling. Such a setting can achieve high-efficiency cooling without affecting further quenching cracking.
[0035] Further, it further includes a roller path for transporting the quenched cylindrical workpiece 1. The turning hook turns the cylindrical workpiece 1 from the roller path onto the rotating idler 2.
[0036] Further, before flaw detection, the magnetic flux leakage probe 3 extends into the inner hole of the cylindrical workpiece 1, and the temperature measuring mechanism is used to detect the temperature of the inner wall of the cylindrical workpiece 1 and feedback the temperature of the inner wall of the cylindrical workpiece 1. When the temperature measuring mechanism detects that the temperature of the inner wall of the cylindrical workpiece 1 is higher than the maximum temperature that the magnetic flux leakage probe 3 can withstand, the temperature measuring mechanism can give an alarm, the magnetic flux leakage probe 3 withdraws from the cylindrical workpiece 1, and the cylindrical workpiece 1 is cooled by the cooling mechanism 4. When the temperature of the inner wall of the cylindrical workpiece 1 meets the requirements, the magnetic flux leakage probe 3 is used to detect the cylindrical workpiece 1. The rotating idler 2 is used to rotate the cylindrical workpiece 1. While the magnetic flux leakage probe 3 extends into the inner hole of the cylindrical workpiece 1, the magnetic flux leakage probe 3 is opened to make the magnetic flux leakage probe 3 contact the inner wall of the steel pipe. During the process of the magnetic flux leakage probe 3 slowly moving along the axial direction of the cylindrical workpiece 1, the inner wall of the cylindrical workpiece 1 is detected for flaws and the quality of the inner wall of the cylindrical workpiece 1 is feedback until the flaw detection is completed.
[0037] Example 1: In this example, the cylindrical workpiece 1 is a medium-carbon CrMo quenched and tempered pipe with a relatively high risk of quenching cracking. The detection results of the cylindrical workpiece 1 by this flaw detection device and a conventional ultrasonic flaw detection device are shown in Table 1, and the comparison results of the qualification rates of flaw detection after direct quenching and tempering and after quenching are shown in Table 2.
[0038] Table 1: Comparison results of flaw detection of cylindrical workpiece 1
[0039]
[0040] Table 2: Comparison results of the qualification rates of flaw detection after direct quenching and tempering and after quenching
[0041]
[0042] It can be seen from Table 1 and Table 2 that when using the technical solution of the present invention to detect the quenched steel pipe, whether using a sample pipe or a steel pipe produced on-site for flaw detection, the defect positions can be accurately found. Combined with the application of the quenching method, especially for medium-carbon CrMo series varieties, batch quenching cracking can be effectively avoided.
[0043] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
[0044] A magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece. This device uses a magnetic flux leakage probe 3 to detect the inner wall of the quenched cylindrical workpiece 1. The cylindrical workpiece 1 rotates in place, and after the magnetic flux leakage probe 3 is opened, it fits with the inner wall of the cylindrical workpiece 1. During operation, the magnetic flux leakage probe 3 moves axially inside the cylindrical workpiece 1 to accurately identify the defects on the inner wall of the cylindrical workpiece 1. The cooling mechanism 4 cools the cylindrical workpiece 1 that does not meet the temperature requirements to ensure that the temperature of the inner wall of the cylindrical workpiece 1 is lower than the maximum temperature that the magnetic flux leakage probe 3 can withstand, preventing damage to the magnetic flux leakage probe 3. The magnetic flux leakage probe 3 adapts to the inner hole of the cylindrical workpiece 1, reducing the impact on the production rhythm caused by frequent specification changes during production. This device can accurately find the defect positions and effectively avoid batch quenching cracking of the cylindrical workpiece 1.
[0045] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An axial magnetic flux leakage flaw detection device for the inner wall of a cylindrical workpiece after quenching, characterized in that, Including: A rotating pulley, on which the cylindrical workpiece is placed, and the rotating pulley can drive the cylindrical workpiece to rotate. A magnetic flux leakage probe, which can enter the interior of the cylindrical workpiece for flaw detection. A temperature measuring mechanism, which is placed at the front end of the magnetic flux leakage probe, and the temperature measuring mechanism can detect the temperature of the inner wall of the cylindrical workpiece before flaw detection.
2. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 1, characterized in that: The magnetic flux leakage probe can open during flaw detection, so that the magnetic flux leakage probe can contact the inner wall of the cylindrical workpiece, and the magnetic flux leakage probe can move axially along the cylindrical workpiece, and the magnetic flux leakage probe performs flaw detection on the cylindrical workpiece while moving axially.
3. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 1, characterized in that: It further includes a cooling mechanism, on which the cylindrical workpiece can be placed, and the cylindrical workpiece can rotate on the cooling mechanism, and the cooling mechanism is used to cool the cylindrical workpiece.
4. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 3, characterized in that: It further includes a workpiece turning hook, which can turn the cylindrical workpiece onto the rotating pulley.
5. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 4, characterized in that: Before flaw detection, the temperature measuring mechanism is used to detect the temperature of the inner wall of the cylindrical workpiece. When the temperature of the inner wall of the cylindrical workpiece does not meet the flaw detection requirements, the workpiece turning hook is used to turn the cylindrical workpiece on the rotating pulley onto the cooling mechanism, the cooling mechanism is started to cool the cylindrical workpiece, and the workpiece turning hook is used to turn the cooled cylindrical workpiece onto the rotating pulley.
6. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 3, characterized in that: The cooling mechanism can cool multiple cylindrical workpieces at the same time, and the cooling mechanism uses an aerosol cooling method, and the cooling speed is between air cooling and water cooling.
7. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 4, characterized in that: It further includes a roller path for transporting the cylindrical workpiece, and the workpiece turning hook turns the cylindrical workpiece from the roller path onto the rotating pulley.
8. The magnetic flux leakage flaw detection device for axial micro-cracks on the inner wall of a quenched cylindrical workpiece according to claim 1, characterized in that: When the temperature measuring mechanism detects that the temperature of the inner wall of the cylindrical workpiece is higher than the maximum temperature that the magnetic flux leakage probe can withstand, the temperature measuring mechanism can give an alarm, and the magnetic flux leakage probe withdraws from the cylindrical workpiece.