Crack detection device

Abstract

The utility model discloses a crack detection device, which relates to the technical field of detection devices, and comprises a monitoring circuit, a conductive component, a signal processing component and an alarm, the tensile capacity of the conductive component is lower than that of a mechanical part, one end of the conductive component is used for being welded on a first welding spot, and the other end of the conductive component is used for being welded on a second welding spot. The other end of the conductive assembly is used for being welded to a second welding spot, the conductive assembly is connected with the monitoring circuit in series, the signal processing assembly is in signal connection with the monitoring circuit and used for monitoring the on-off state of the circuit in real time, and the alarm is in signal connection with the signal processing assembly and used for triggering alarm when the monitoring circuit is disconnected. According to the crack detection device, the conductive assembly is connected in series into the monitoring circuit, the signal processing assembly monitors whether the monitoring circuit is powered on or not, the alarm gives an alarm to achieve crack detection, the conductive assembly can select any size according to detection requirements, in this way, the detection range can be freely selected, and the detection efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection device technical field, especially relate to a crack detection device. BACKGROUND

[0002] With the increase of megawatt of wind turbine, the load that wind power component test bench structure bears is bigger and bigger, and the wind power component test bench structure has the possibility of crack due to fatigue or stress concentration. In order to avoid the harm of structure cracking to personnel and equipment, it is necessary to monitor and timely warn the crack.

[0003] In the prior art, strain gauges are generally used for detection, and the resistance change of strain gauges is used to monitor whether the wind power component test bench produces cracks. However, the size of strain gauges is generally small, so that the use of strain gauges cannot realize large-area detection, which leads to poor detection effect.

[0004] Therefore, it is necessary to provide a new crack detection device to solve the above technical problems. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a crack detection device, which aims to improve the technical problem of poor crack detection effect in the prior art.

[0006] To achieve the above purpose, the utility model provides a crack detection device for crack detection of mechanical components, the mechanical components prone to cracks are provided with first and second welding points, and the crack detection device comprises:

[0007] A monitoring circuit;

[0008] A conductive assembly, the tensile strength of the conductive assembly is lower than that of the mechanical component, one end of the conductive assembly is welded to the first welding point, the other end of the conductive assembly is welded to the second welding point, and the conductive assembly is connected in series with the monitoring circuit;

[0009] A signal processing assembly, the signal processing assembly is connected with the monitoring circuit, and the signal processing assembly is used to monitor the on-off state of the monitoring circuit in real time;

[0010] An alarm, the alarm is connected with the signal processing assembly, and the alarm is used to trigger an alarm when the monitoring circuit is disconnected.

[0011] In an embodiment, the conductive assembly is used to adhere to the outer surface of the mechanical component, and the conductive assembly extends in a wave shape or a spiral shape to prolong the effective monitoring length of the conductive assembly.

[0012] In an embodiment, the number of the electrically conductive components is plural, the number of the monitoring circuits is plural, the number of the monitoring circuits is equal to the number of the electrically conductive components, and the monitoring circuits are arranged one-to-one corresponding to the electrically conductive components, and the electrically conductive components are arranged circumferentially along the central axis of the mechanical component, and the signal processing components are respectively connected to the monitoring circuits.

[0013] In an embodiment, the electrically conductive component comprises an enameled wire and a pre-tightening adjusting component arranged at both ends of the enameled wire, and the pre-tightening adjusting components are respectively welded to the first and second welding points, and the pre-tightening adjusting components are used to apply tension to the enameled wire.

[0014] In an embodiment, each of the pre-tightening adjusting components comprises a fixing member and a telescopic rod, the fixing member is formed with a through hole, and the telescopic rod is telescopically installed in the through hole, and the fixing members are respectively welded to the first and second welding points.

[0015] In an embodiment, the hole wall of the through hole is formed with an internal thread, the outer wall of the telescopic rod is formed with an external thread, and the telescopic rod is threadedly connected to the internal thread of the through hole through the external thread.

[0016] In an embodiment, the crack detection device further comprises a fixing support, and the pre-tightening adjusting component further comprises a driving sub-component, the cylinder body of the driving sub-component is installed in the fixing support, the rotating shaft of the driving sub-component is connected to the telescopic rod, and the extension shaft of the driving sub-component can be rotated to loosen or tighten the enameled wire.

[0017] In an embodiment, the electrically conductive component further comprises a fluorescent layer and a covering layer, the fluorescent layer is attached to the enameled wire, and the covering layer is attached to the fluorescent layer.

[0018] In an embodiment, the crack detection device further comprises a strain gauge, the strain gauge is used to be attached to the surface of the mechanical component, and the strain gauge is arranged close to the electrically conductive component, and the signal processing component is connected to the strain gauge.

[0019] In an embodiment, the crack detection device further comprises a drone, the drone is connected to the alarm, and the drone is used to take images of the crack position.

[0020] In the above scheme, the crack detection device is used for crack detection of a mechanical component, the mechanical component is provided with a first welding point and a second welding point at a position prone to crack, the crack detection device comprises a monitoring circuit, a conductive assembly, a signal processing assembly and an alarm, the tensile strength of the conductive assembly is lower than that of the mechanical component, one end of the conductive assembly is welded to the first welding point, the other end of the conductive assembly is welded to the second welding point, the conductive assembly is connected in series with the monitoring circuit, the signal processing assembly is connected in signal with the monitoring circuit, the signal processing assembly is used for monitoring the on-off state of the circuit in real time, the alarm is connected in signal with the signal processing assembly, and the alarm is used for triggering an alarm when the monitoring circuit is disconnected. The mechanical component can be a wind power component test bench or other mechanical components such as a bridge and a building. Taking the wind power component test bench as an example, the first welding point and the second welding point are marked at the crack-prone area of the wind power component test bench, that is, the stress concentration area. The interval between the first welding point and the second welding point is set according to the detection requirement. The two ends of the conductive assembly are welded to the first welding point and the second welding point respectively under the working condition of loading the rated bending moment of the wind power component test bench, so that the influence of deformation of the wind power component test bench after the bending moment is applied can be eliminated. Then, the monitoring circuit and the conductive assembly are connected in series, wherein the monitoring circuit can be a resistance circuit. Then, the monitoring circuit and the signal processing assembly are connected in signal. The alarm and the signal processing assembly are connected in signal. In this way, the installation of the crack detection device is completed. When the wind power component test bench cracks, the tensile strength of the conductive assembly is lower than that of the wind power component test bench. Thus, when the wind power component test bench cracks, the conductive assembly will be broken. Since the conductive assembly is connected in series to the monitoring circuit, when the conductive assembly is broken, the monitoring circuit will be disconnected, and the signal processing assembly will monitor the disconnection of the monitoring circuit. Then, the signal processing assembly will transmit a signal to the alarm, so that the alarm can issue an alarm to remind the operator that the wind power component test bench has a crack, thereby protecting the safety of the operator and the safety of the wind power component test bench. Meanwhile, the signal processing assembly and the wind power component test bench can be connected in signal. Thus, when the wind power component test bench cracks, the wind power component test bench can be stopped through the signal processing assembly, thereby realizing automatic shutdown. In the utility model, the crack detection is realized by connecting the conductive assembly to the monitoring circuit, monitoring whether the monitoring circuit is powered on through the signal processing assembly, and alarming through the alarm. The conductive assembly can be selected in any size according to the detection requirement, so that the detection range can be freely selected, and the detection efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained from the structures shown in the drawings without creative labor for those skilled in the art.

[0022] Figure 1 The whole structure schematic diagram of the crack detection device one embodiment provided by the utility model is shown in the figure.

[0023] Figure 2 The installation schematic diagram of the conductive assembly one embodiment provided by the utility model is shown in the figure.

[0024] Figure 3 The installation schematic diagram of the conductive assembly another embodiment provided by the utility model is shown in the figure.

[0025] Figure 4 The installation schematic diagram of the plurality of conductive assemblies one embodiment provided by the utility model is shown in the figure.

[0026] Figure 5 The structure schematic diagram of the pre-tightening adjusting part one embodiment provided by the utility model is shown in the figure.

[0027] Figure 6 The connection schematic diagram of the driving sub-part and the pre-tightening adjusting part one embodiment provided by the utility model is shown in the figure.

[0028] Figure 7 The whole structure schematic diagram of the crack detection device another embodiment provided by the utility model is shown in the figure.

[0029] Explanation of the figure mark:

[0030] 100, crack detection device; 101, mechanical part; 101a, first welding point; 101b, second welding point; 1, monitoring circuit; 2, conductive assembly; 3, signal processing assembly; 4, alarm; 21, enameled wire; 22, pre-tightening adjusting part; 221, fixing piece; 221a, through hole; 222, telescopic rod; 5, fixed support; 223, driving sub-part; 6, strain gauge.

[0031] The realization, functional features and advantages of the utility model will be further described by combining with the embodiments and referring to the drawings. Specific implementation

[0032] The technical scheme in the embodiments of the utility model will be clearly and completely described below by combining with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] It should be noted that if the embodiment of the utility model has the direction indication (such as up, down, left, right, front, back, etc.), the direction indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, if the certain posture changes, then the direction indication also changes accordingly.

[0034] In addition, if the embodiment of the utility model has the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

[0035] Please refer to Figure 1The utility model provides a crack detection device 100 for the crack detection of mechanical parts 101, and the first welding point 101a and the second welding point 101b are arranged at the position prone to crack of the mechanical parts 101. The crack detection device 100 comprises a monitoring circuit 1, a conductive assembly 2, a signal processing assembly 3 and an alarm 4. The tensile strength of the conductive assembly 2 is lower than that of the mechanical parts 101. One end of the conductive assembly 2 is welded to the first welding point 101a, and the other end of the conductive assembly 2 is welded to the second welding point 101b. The conductive assembly 2 is connected in series with the monitoring circuit 1. The signal processing assembly 3 is connected in signal with the monitoring circuit 1 and is used to monitor the on-off state of the monitoring circuit 1 in real time. The alarm 4 is connected in signal with the signal processing assembly 3 and is used to trigger the alarm when the monitoring circuit 1 is disconnected. The mechanical parts 101 can be a wind power component test bench or other mechanical parts 101 such as a bridge and a building. Taking the wind power component test bench as an example, the first welding point 101a and the second welding point 101b are marked at the stress concentration area of the wind power component test bench, and the interval between the first welding point 101a and the second welding point 101b is set according to the detection requirement. The two ends of the conductive assembly 2 are welded to the first welding point 101a and the second welding point 101b respectively under the working condition of loading the rated bending moment of the wind power component test bench, so that the influence of the deformation of the wind power component test bench after the bending moment is applied can be eliminated. Then, the monitoring circuit 1 is connected in series with the conductive assembly, wherein the monitoring circuit 1 can be a resistance circuit. Then, the monitoring circuit 1 is connected in signal with the signal processing assembly 3, and the alarm 4 is connected in signal with the signal processing assembly 3, so that the installation of the crack detection device 100 is completed. When the wind power component test bench appears cracks, the tensile strength of the conductive assembly 2 is lower than that of the wind power component test bench, so that the wind power component test bench appears cracks, and the conductive assembly 2 is broken. Since the conductive assembly 2 is connected in series with the monitoring circuit 1, the monitoring circuit 1 is disconnected after the conductive assembly 2 is broken, and the signal processing assembly 3 can monitor the disconnection of the monitoring circuit 1. Then, the signal processing assembly 3 transmits the signal to the alarm 4, so that the alarm 4 gives an alarm to remind the operating personnel that the wind power component test bench has cracks, and the safety of the operating personnel and the wind power component test bench is protected. Meanwhile, the signal processing assembly 3 can be connected in signal with the wind power component test bench, so that the wind power component test bench can be stopped through the signal processing assembly 3 after the wind power component test bench appears cracks, and automatic stopping is realized. In the utility model, the crack detection is realized by connecting the conductive assembly 2 in series with the monitoring circuit 1, monitoring whether the monitoring circuit 1 is powered on through the signal processing assembly 3 and giving an alarm through the alarm 4. The conductive assembly 2 can be selected in any size according to the detection requirement, so that the detection range can be freely selected, and the detection efficiency is greatly improved.

[0036] Please refer to Figure 2 and Figure 3In an embodiment, the conductive assembly 2 is used to fit on the outer surface of the mechanical component 101, and the conductive assembly 2 extends in a wavy or spiral shape to extend the effective monitoring length of the conductive assembly 2. By adopting a wavy or spiral design, the effective length of the conductive assembly 2 can be significantly increased without increasing the actual occupied space. The benefit of this is that the probability of detecting a crack is increased, because a longer conductive path means that even a small crack can cause the circuit to be broken, thereby triggering an alarm. The mechanical component 101 often has a complex geometry and different surface conditions. The wavy or spiral conductive assembly 2 design can better fit these irregular surfaces, ensuring effective crack monitoring in key stress concentration areas or complex shape areas. Such a structural conductive assembly 2 more closely follows the changes in the shape of the mechanical component 101, which means that even a slight deformation or crack can be quickly detected, improving the sensitivity and reliability of the entire system.

[0037] Further, the signal processing assembly can include a current sensor for detecting the current of the monitoring circuit.

[0038] Referring to Figure 4 In an embodiment, the number of conductive assemblies 2 is multiple, the number of monitoring circuits 1 is multiple, the number of the multiple monitoring circuits 1 is equal to the number of the multiple conductive assemblies 2, and the multiple monitoring circuits 1 and the multiple conductive assemblies 2 are arranged one-to-one. The multiple conductive assemblies 2 are arranged in a circumferentially spaced manner along the central axis of the mechanical component 101, and the signal processing assembly 3 is respectively connected to the multiple monitoring circuits 1. By arranging multiple conductive assemblies 2 around the mechanical component 101 in a circumferentially spaced manner, the overall monitoring of the surface cracks of the mechanical component 101 can be achieved. Such a layout can ensure that even cracks expanding in different directions can be detected in time, improving the comprehensiveness and accuracy of the overall detection. The design of multiple conductive assemblies 2 and monitoring circuits 1 can improve the reliability of the system through redundancy, so that even if a conductive assembly 2 fails due to accidental reasons, the other assemblies can still work normally, ensuring the continuity of crack detection. Since each conductive assembly 2 is connected to an independent monitoring circuit 1, when a crack occurs in a certain area causing the corresponding conductive assembly 2 to break, the signal processing assembly 3 can accurately determine the approximate location of the crack according to which circuit is broken, which is very helpful for subsequent maintenance and repair work, and can quickly locate the problem, reducing downtime.

[0039] Referring to Figure 1In an embodiment, the conductive assembly 2 includes an enameled wire 21 and pre-tightening adjustment components 22 arranged at both ends of the enameled wire 21, and the two pre-tightening adjustment components 22 are respectively used for welding with the first welding point 101a and the second welding point 101b. The pre-tightening adjustment components 22 are used for applying tension to the enameled wire 21. The enameled wire 21 has good conductive wire, so it can be smoothly connected to the monitoring circuit 1, and the enameled wire 21 has weak tensile capacity, so that when the mechanical component 101 has a slight crack, the enameled wire 21 will break, so as to make the whole crack detection device 100 sensitive; at the same time, the pre-tightening adjustment components 22 can apply appropriate tension to the enameled wire 21, so that the enameled wire 21 can be closely attached to the surface of the mechanical component 101. This close contact also helps to improve the sensitivity of crack detection, because even a small crack can cause the circuit to break, thereby triggering an alarm. The pre-tightening adjustment components 22 can adjust the tension of the enameled wire 21 according to actual needs, so that the enameled wire 21 can adapt to mechanical components 101 of different shapes and sizes, and appropriate tension can make the enameled wire 21 more evenly distribute external stresses when subjected to external stresses, reducing the possibility of local overload, thereby prolonging the service life of the enameled wire 21 and its connection points.

[0040] Referring to Figure 1 and Figure 5 In an embodiment, each pre-tightening adjustment component 22 includes a fixing piece 221 and a telescopic rod 222, the fixing piece 221 is formed with a through hole 221a, the telescopic rod 222 is telescopically installed in the through hole 221a, and the two fixing pieces 221 are respectively welded to the first welding point 101a and the second welding point 101b. By extending or retracting the telescopic rod 222 out of the through hole 221a, the tension adjustment of the enameled wire 21 is realized, and the operator only needs to pull the telescopic rod 222 to realize the adjustment, so that the operation is convenient.

[0041] Referring to Figure 5 In an embodiment, the hole wall of the through hole 221a is formed with internal threads, the outer wall of the telescopic rod 222 is formed with external threads, and the telescopic rod 222 is threadedly connected with the internal threads of the through hole 221a through the external threads. By threadedly connecting the telescopic rod 222 and the through hole 221a, fine adjustment can be realized through the number of turns and the pitch of rotation, accurate tension adjustment can be realized, and it is ensured that the tension of the enameled wire 21 will not be too large or too small.

[0042] Referring to Figure 5 and Figure 6In an embodiment, the crack detection device 100 further comprises a fixed support 5, and the pre-tightening adjusting component 22 further comprises a driving sub-component 223, a cylinder of the driving sub-component 223 is installed on the fixed support 5, a rotating shaft of the driving sub-component 223 is connected with the telescopic rod 222, and an extending shaft of the driving sub-component 223 can rotate to loosen or tighten the enameled wire 21. Through accurate control of the driving sub-component 223, fine adjustment of the tension of the enameled wire 21 can be realized, and it is ensured that the conductive assembly 2 always maintains the best working state. Such accuracy helps to improve the sensitivity and reliability of crack detection, the driving sub-component 223 can automatically adjust the tension of the enameled wire 21 according to actual needs, without manual intervention, and the automation level and response speed of the whole system are improved.

[0043] In an embodiment, the conductive assembly 2 further comprises a fluorescent layer and a covering layer, the fluorescent layer is attached to the enameled wire 21, and the covering layer is attached to the fluorescent layer. When the wire assembly is not broken, the covering layer blocks the fluorescent layer, and the worker cannot observe the fluorescence. When the wire assembly is broken, the fluorescent layer is exposed, and the worker can obviously see it, achieving the effect of reminding the worker.

[0044] Please refer to Figure 7 In an embodiment, the crack detection device 100 further comprises a strain gauge 6, the strain gauge 6 is used to be attached to the surface of the mechanical component 101, and the strain gauge 6 is arranged close to the conductive assembly 2, and the signal processing assembly 3 is signal-connected with the strain gauge 6. When the mechanical component 101 deforms, the strain gauge 6 attached to the mechanical component 101 also deforms, and the resistance of the strain gauge 6 changes. After the signal processing assembly 3 detects the resistance change of the strain gauge 6, the signal processing assembly 3 judges that there may be a crack in the mechanical component 101, and the signal processing assembly 3 detects whether the monitoring circuit 1 is open. If there is an open circuit, it indicates that there is indeed a crack, and the alarm 4 is controlled to issue an alarm. If there is no open circuit, the signal processing assembly 3 continues to detect the resistance change of the strain gauge 6, and repeats the above steps when the change occurs, until the monitoring circuit 1 has an open circuit. Through the setting of the strain gauge 6, double detection and cross verification are realized, so as to reduce the false alarm rate.

[0045] In an embodiment, the crack detection device 100 further comprises a drone, the drone is signal-connected with the alarm 4, and the drone is used to shoot images of the crack position. When the alarm is issued, the drone starts, and the drone can quickly fly to the position suspected to have a crack and shoot it. Through high-definition images or videos, the specific position and range of the crack can be more accurately determined, and accurate information is provided for subsequent maintenance. Moreover, for some areas that are difficult to access or dangerous, using the drone instead of manual inspection can greatly reduce the risk of the worker and ensure personal safety.

[0046] The above are only exemplary embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A crack detection device for crack detection of a mechanical member provided with a first weld and a second weld at a position where a crack is likely to occur, characterized by, The crack detection device comprises a monitoring circuit, a conductive component, a signal processing component, and an alarm. The conductive component is used to be welded to the first welding point at one end and to the second welding point at the other end. The conductive component is used to be attached to the outer surface of the mechanical component and extends in a wave shape or a spiral shape to prolong the effective monitoring length of the conductive component. The crack detection device further comprises a plurality of the monitoring circuits and a plurality of the conductive components. The crack detection device further comprises a strain gauge.

2. The crack detection apparatus according to claim 1, wherein The crack detection device further comprises a UAV.

3. The crack detection apparatus of claim 1, wherein The crack detection device further comprises a strain gauge.

4. The crack detection apparatus according to any one of claims 1 to 3, characterized by, The crack detection device further comprises a UAV.

5. The crack detection apparatus of claim 4, wherein ​ 6. The crack detection apparatus of claim 5, wherein ​ 7. The crack detection apparatus of claim 6, wherein ​ 8. The crack detection apparatus of claim 4, wherein ​ 9. The crack detection apparatus according to any one of claims 1 to 3, wherein ​ 10. The crack detection apparatus according to any one of claims 1 to 3, wherein ​

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