A heat exchanger tube bundle eddy current detection device

Abstract

An eddy current testing device for heat exchanger tube bundles includes a frame with a coil mounted on it. A motor drives the coil, and a testing wire is wound around it. A guide wheel is positioned below the coil, and a rotating shaft is mounted on the guide wheel. A coil counter is positioned beside the rotating shaft. A probe is attached to the front end of the testing wire, and a rigid rod is sleeved on the testing wire. A fixing frame is mounted on the rigid rod. Through the cooperation of the coil counter and the guide wheel, the movement length of the testing wire is accurately measured, thereby accurately determining the position of the probe within the heat exchanger tube bundle. Compared to the traditional method of determining defect location by marking the length of the rigid tube, this significantly improves the accuracy of defect localization. During the testing process, the device can acquire defect location information simultaneously with the detection of the defect signal through the cooperation of the coil counter and the eddy current testing host, eliminating the need to wait for the probe to be completely removed before marking and measuring, thus improving testing efficiency and saving time.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger testing, and in particular to a heat exchanger tube bundle eddy current testing device. Background Technology

[0002] Heat exchangers are static equipment widely used in oil refining and chemical plants. Common heat exchanger failures mainly occur in the heat exchange tubes. During the use of heat exchange tubes, liquid enters and causes wear. Eddy current testing has been widely used in the field of heat exchanger tube testing. It is a rapid testing method based on electromagnetic principles. When a coil carrying alternating current is placed on a metal plate or inside a metal tube, an alternating magnetic field is generated in and around the coil, causing eddy currents to form in the test piece. Since the eddy current signal changes with the defects in the workpiece, the condition of the defects can be judged by the changes in the eddy current signal of the coil.

[0003] Existing eddy current testing devices for heat exchanger tube bundles involve inserting a rigid tube with a probe into the heat exchanger tube bundle and then manually pulling it outwards. After detecting an internal defect, the device marks the location of the defect based on the length of the tube inserted into the heat exchanger tube. However, this structure leads to errors in the marked length during testing, and the exact length can only be determined from the marking after the probe is completely removed. Furthermore, the probes wear out after long-term use, and existing probes are inconvenient to replace. To address these issues, a new eddy current testing device for heat exchanger tube bundles is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems of errors in the length of the markings in existing detection structures and the inconvenience of replacing worn probes.

[0005] The present invention adopts the following technical solution:

[0006] A heat exchanger tube bundle eddy current detection device includes a frame, a coil is mounted on the frame, a motor drives the coil, a detection wire is wound on the coil, a guide wheel is mounted below the coil, a rotating shaft is mounted on the guide wheel, a coil counter is mounted next to the rotating shaft, a probe is mounted at the front end of the detection wire, a rigid rod is sleeved on the detection wire, and a fixing frame is mounted on the rigid rod;

[0007] Furthermore, one end of the detection wire on the coil is threaded with a probe, and the other end is connected to the eddy current detection host. The middle part of the detection wire passes around the guide wheel and drives the guide wheel to rotate. The guide wheel has a fixedly connected rotating shaft, and the rotating shaft has an induction connector for use with the coil counter. The coil counter is electrically connected to the eddy current detection host.

[0008] Furthermore, one end of the probe has a circular threaded slot for threaded connection with the detection wire, and the outer wall of the slot is also threaded for threaded connection with a rigid rod.

[0009] Furthermore, the rigid rod is a hollow through-hole structure, with threads on the inner wall of one end for connection to the threads on the outer wall of the probe slot, and a connecting joint on the other end. The outer wall of the connecting joint is threaded for connection to another rigid rod.

[0010] Furthermore, the threads on the inner wall of the rigid rod are used to connect with the threads on the outer wall of the connecting joint of another rigid rod;

[0011] Furthermore, the guide wheel is mounted on the frame and has anti-slip rubber for contact with the detection wire;

[0012] Furthermore, the fixing frame is mounted on the machine frame, and the fixing frame includes a slide groove. A screw is mounted on the slide groove and controlled by an external motor. A slider is mounted inside the slide groove and is connected to the screw by a thread. An electric push rod is mounted on the slider, and a support frame is mounted on the upper end of the electric push rod. The support frame has two sets of drive wheels, and the rigid rod is located between the two sets of drive wheels.

[0013] The beneficial effects of this utility model are:

[0014] By using a coil counter in conjunction with a guide wheel, the movement length of the detection wire is accurately measured, thereby accurately determining the position of the probe within the heat exchanger tube bundle. Compared to the traditional method of determining the defect location by marking the length of rigid tubes, this method greatly improves the accuracy of defect location and reduces errors.

[0015] During the inspection process, the location information of the defect can be obtained in real time by cooperating with the coil counter and the eddy current detection host while detecting the defect signal. There is no need to wait for all the probes to be removed before marking and measuring, which improves the inspection efficiency and saves time.

[0016] The probe is connected to the detection wire and rigid rod by threads. This connection method makes the probe replacement very convenient. When the probe wears out, it can be quickly disassembled and replaced with a new probe, reducing equipment maintenance time and costs and improving equipment utilization efficiency.

[0017] The support frame and drive wheel can move up, down, left, and right through the action of the screw, slider, and electric push rod, which makes it easy for the rigid rod to be inserted into any tube opening of the heat exchanger tube bundle, thus improving the efficiency of use.

[0018] The guide wheel is equipped with anti-slip rubber to ensure that the detection wire fits tightly against the guide wheel during movement, ensuring stable transmission and preventing slippage. This guarantees the accuracy of the coil counter's measurement length and, consequently, the accuracy of defect location. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a heat exchanger tube bundle eddy current detection device according to a utility model.

[0020] Figure 2 This is a schematic diagram of the usage structure of a heat exchanger tube bundle eddy current detection device according to a utility model.

[0021] Figure 3 This is a partial structural schematic diagram of a heat exchanger tube bundle eddy current detection device according to a utility model.

[0022] Figure 4 This is a schematic diagram of the internal structure of a heat exchanger tube bundle eddy current detection device according to a utility model.

[0023] Figure 5 A schematic diagram of a rigid rod structure for a heat exchanger tube bundle eddy current detection device according to a utility model.

[0024] Figure 6 A schematic diagram of the fixing frame structure of a heat exchanger tube bundle eddy current detection device according to a utility model;

[0025] In the diagram: 1. Frame; 2. Wire reel; 3. Motor; 4. Detection wire; 5. Guide wheel; 6. Rotating shaft; 7. Induction connector; 8. Coil counter; 9. Probe; 10. Rigid rod; 11. Connecting connector; 12. Heat exchanger tube bundle; 13. Fixing frame; 14. Slide groove; 15. Screw; 16. Slider; 17. Electric push rod; 18. Support frame; 19. Drive wheel. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1

[0030] This utility model provides a heat exchanger tube bundle eddy current detection device, including a frame 1, a coil 2 on the frame 1, a motor 3 driving the coil 2, a detection wire 4 wound on the coil 2, a guide wheel 5 below the coil 2, a rotating shaft 6 on the guide wheel 5, a coil counter 8 next to the rotating shaft 6, a probe 9 at the front end of the detection wire 4, a rigid rod 10 sleeved on the detection wire 4, and a fixing frame 13 on the rigid rod 10;

[0031] Furthermore, one end of the detection wire 4 on the coil 2 is threaded with a probe 9, and the other end is connected to the eddy current detection host. The middle part of the detection wire 4 passes around the guide wheel 5 and drives the guide wheel 5 to rotate. The guide wheel 5 has a fixedly connected rotating shaft 6, and the rotating shaft 6 has an induction connector 7 that works with the coil counter 8. The coil counter 8 is electrically connected to the eddy current detection host.

[0032] Furthermore, one end of the probe 9 has a circular threaded slot for threaded connection with the detection wire 4, and the outer wall of the slot is also threaded for threaded connection with the rigid rod 10.

[0033] Furthermore, the rigid rod 10 has a hollow through-hole structure, with threads on the inner wall of one end for connection with the threads on the slotted outer wall of the probe 9, and a connecting joint 11 at the other end. The connecting joint 11 has threads on its outer wall for connection with another rigid rod 10.

[0034] Furthermore, the threads on the inner wall of the rigid rod 10 are used to connect with the threads on the outer wall of the connecting joint 11 of another rigid rod 10.

[0035] Furthermore, the guide wheel 5 is mounted on the frame 1, and the guide wheel 5 has anti-slip rubber for contact with the detection wire 4;

[0036] Furthermore, the fixed frame 13 is mounted on the machine frame. The fixed frame 13 includes a slide groove 14, on which a screw 15 is mounted. The screw 15 is controlled by an external motor. A slider 16 is mounted inside the slide groove 14. The slider 16 is connected to the screw 15 by a thread. An electric push rod 17 is mounted on the slider 16. A support frame 18 is mounted on the upper end of the electric push rod 17. The support frame 18 has two sets of drive wheels 19. A rigid rod 10 is located between the two sets of drive wheels 19.

[0037] Working principle:

[0038] In use, first connect the detection wire 4 and probe 9 through the inner thread of the slot, and then make an electrical connection to connect probe 9 to the eddy current detection host. Connect probe 9 to the rigid rod 10 through the thread on the outer end of the slot. Connect the connecting joint 11 of the rigid rod 10 to the inner wall of another rigid rod 10 through threads. Select an appropriate number of rigid rods 10 according to the specific length of the heat exchanger tube bundle 12. At this time, part of the detection wire 4 is located inside the rigid rod 10. The rotation of the screw 15 in the slide groove 14 drives the support frame 18 to move left and right within the slide groove 14. Simultaneously, control the extension and retraction of the electric push rod 17 to move the support frame 18 up and down, extending the rigid rod 10 and probe 9 between the two drive wheels 19. The two drive wheels 19 have anti-slip pads. Through the action of the drive wheels 19, the rigid rod 10 and probe 9 are extended into any tube of the heat exchanger tube bundle 12. Inside the tube bundle 12, after reaching the deepest point, the control motor 3 drives the coil 2 to rotate, causing the detection wire 4 and probe 9 to move outward. Simultaneously, probe 9 performs eddy current detection on the heat exchanger tube bundle 12, transmitting the signal to the eddy current detection host via an electrical signal. At this time, the detection wire 4 is retrieved by the coil 2 via the guide wheel 5. The guide wheel 5 has anti-slip rubber, ensuring that the moving distance of the detection wire 4 is the same as the rotation distance of the guide wheel 5. At the same time, the rotating shaft 6 on the guide wheel 5 has an induction connector 7, which receives the signal from the induction connector 7 through the coil counter 8 and transmits the distance information to the eddy current detection host. The host directly calculates the specific location of the damage to the heat exchanger tube bundle 12, making it convenient to use. When probe 9 needs to be replaced after long-term use, simply unscrew the threaded connection between probe 9 and detection wire 4 and rigid rod 10, and reinstall the new probe 9 according to the above installation method. This is convenient, quick, and improves work efficiency.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger tube bundle eddy current detection device, characterized in that, The device includes a frame (1), on which a reel (2) is mounted. A motor (3) drives the reel (2). A detection wire (4) is wound on the reel (2). A guide wheel (5) is located below the reel (2). A rotating shaft (6) is located on the guide wheel (5). A coil counter (8) is located next to the rotating shaft (6). A probe (9) is located at the front end of the detection wire (4). A rigid rod (10) is sleeved on the detection wire (4). A fixing frame (13) is located on the rigid rod (10).

2. The heat exchanger tube bundle eddy current detection device according to claim 1, characterized in that, One end of the detection wire (4) on the coil (2) is threaded with a probe (9), and the other end is connected to the eddy current detection host. The middle part of the detection wire (4) passes around the guide wheel (5) and drives the guide wheel (5) to rotate. The guide wheel (5) has a fixedly connected rotating shaft (6), and the rotating shaft (6) has an induction connector (7) that works with the coil counter (8). The coil counter (8) is electrically connected to the eddy current detection host.

3. The heat exchanger tube bundle eddy current detection device according to claim 2, characterized in that, One end of the probe (9) has a circular threaded slot for threaded connection with the detection wire (4), and the outer wall of the slot is also threaded for threaded connection with the rigid rod (10).

4. The heat exchanger tube bundle eddy current detection device according to claim 3, characterized in that, The rigid rod (10) is a hollow through structure. One end of the inner wall is threaded for connection with the thread on the slotted outer wall of the probe (9). The other end is provided with a connecting joint (11). The outer wall of the connecting joint (11) is threaded for connection with another rigid rod (10).

5. The heat exchanger tube bundle eddy current detection device according to claim 4, characterized in that, The threads on the inner wall of the rigid rod (10) are used to connect with the threads on the outer wall of the connecting joint (11) of another rigid rod (10).

6. The heat exchanger tube bundle eddy current detection device according to claim 5, characterized in that, The guide wheel (5) is mounted on the frame (1) and has anti-slip rubber for contacting the detection wire (4).

7. The heat exchanger tube bundle eddy current detection device according to claim 6, characterized in that, The fixing frame (13) is mounted on the machine frame. The fixing frame (13) includes a slide groove (14). A screw (15) is mounted on the slide groove (14). The screw (15) is controlled by an external motor. A slider (16) is mounted inside the slide groove (14). The slider (16) is connected to the screw (15) by a thread. An electric push rod (17) is mounted on the slider (16). A support frame (18) is mounted on the upper end of the electric push rod (17). Two sets of drive wheels (19) are mounted on the support frame (18). The rigid rod (10) is located between the two sets of drive wheels (19).

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