Cable fault detector

Abstract

The invention relates to the technical field of electrical equipment fault detection, in particular to a cable fault detector which comprises a detection moving frame. An assembling bottom groove is formed in the lower end of the detection moving frame, and side edge grooves formed in the inner wall of the detection moving frame are formed in the two sides of the assembling bottom groove. According to the invention, the ground cleaning structure can remove sundries and accumulated water in soil above and around the buried cable, prevents the sundries from interfering heat conduction and the accumulated water from accelerating heat loss, enables cable heat to be more smoothly transmitted to the surface of the soil, remarkably improves the accuracy of infrared thermal imaging detection, facilitates more accurate positioning of a cable fault point, and improves the reliability of cable fault detection. The ground cleaning structure cleans sundries on soil of the buried cable at the bottom of the detection moving frame to one side, the cleaning mode further reduces the influence of the sundries on heat conduction, the accuracy of infrared thermal imaging during cable fault detection is improved from the side face, and it is guaranteed that the detection result is more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment fault detection, and in particular to a cable fault detector. Background Art

[0002] The cable fault detector is a comprehensive cable fault detection instrument that can test the high-resistance flashover fault of the cable, the high and low resistance grounding, the short circuit and the cable disconnection, the poor contact and other faults. At present, the cable fault detector for large cables is basically a cubic box, and the detection equipment is stored in the box, which can protect the machine body and is also easy to carry. The Chinese patent discloses a cable fault detector (authorization announcement number CN212693944U). The patent technology discloses a cable fault detector, including a box, a first built-in slot and a second built-in slot are respectively provided in the box, the first built-in slot is fixed with the machine body, the second built-in slot is fixed with a storage box, the storage box is filled with desiccant particles, the storage box is covered with a mesh plate, the mesh plate is fixed with a first handle, and the lower end of the box is provided with a storage box. The desiccant particles in the storage box can absorb the moisture in the box to prevent the machine body from getting damp, and the buffering effect of the spring is combined to prevent the overall body from being damaged by bumps when it is placed. This patented technology solves the problem that the current box structure is relatively simple, consisting of only a protective shell structure, which makes it easy for the body to be damaged due to collision when placed. At the same time, in humid weather, water vapor is easily accumulated in the box, causing the body to become damp.

[0003] However, when the infrared thermal imaging device in the prior art detects the fault point of the buried cable when there are weeds, puddles and other debris on the soil surface of the buried cable, it is easy to cause inaccurate detection of the fault point of the buried cable. It is necessary to solve the problem of reducing the interference of external factors when performing thermal imaging detection on the buried cable in the prior art.

[0004] Therefore, those skilled in the art provide a cable fault detector to solve the problems raised in the above background technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides:

[0006] A cable fault detector comprises: a detection moving frame; a mounting bottom groove is provided inside the lower end of the detection moving frame, and side grooves are provided on both sides of the mounting bottom groove and are provided on the inner wall of the detection moving frame;

[0007] The inner side of the assembly bottom groove of the detection moving frame is equipped with a ground cleaning structure for cleaning the soil on the surface of the buried cable;

[0008] The ground cleaning structure includes three cleaning augers rotatably arranged inside the assembly bottom groove and its side grooves, and worm wheels I are fixedly assembled on the outer walls of both ends of the three cleaning augers located in the side grooves. The worm wheel I meshes with a worm I, the worm I is fixedly assembled with a driving shaft rod, and one end of the driving shaft rod is connected with a servo motor. The servo motor drives the three cleaning augers actively through the meshing of the worm I with the worm wheel I to clean the surface of the buried cable to one side of the detection moving frame;

[0009] An infrared thermal imaging structure for thermally imaging fault detection of the buried cable is assembled on the detection moving frame.

[0010] Preferably: The ground cleaning structure includes underground temperature detection components assembled at the four corners of the detection moving frame, and the underground temperature detection components include a test assembly frame fixedly installed inside the detection moving frame, and vertical adjustment frames integrally fixed at both ends of the test assembly frame and located inside the detection moving frame;

[0011] A driven shaft rod is rotatably assembled inside the test assembly frame, and two worm bodies and a pulley II are fixed on the outer wall of the driven shaft rod. The two worm bodies are respectively fixedly installed on the outer walls of both ends of the driven shaft rod.

[0012] Preferably: A belt body is wound around the outside of the pulley II, and a pulley I is wound around the bottom of the belt body. The pulley I is integrally fixed on the outer wall of the driving shaft rod.

[0013] Preferably: An adjustment screw rod is rotatably installed inside the vertical adjustment frame, and a worm wheel body meshing with the worm body is fixedly installed on the outer wall of the bottom end of the adjustment screw rod. The top end of the adjustment screw rod is rotatably assembled with a top shaft frame plate, and the top shaft frame plate is vertically movably arranged inside the vertical adjustment frame;

[0014] A vertical rod is rotatably installed inside one end of the top shaft frame plate away from the adjustment screw rod. A bottom cone rod is integrally fixed at the bottom end of the vertical rod, and a temperature detector for detecting the temperature of the buried cable in the soil is installed inside the bottom of the vertical rod.

[0015] Preferably: An internal worm wheel is fixedly installed at the position of the top end of the vertical rod inside the top shaft frame plate, and the internal worm wheel meshes with an internal worm, and the internal worm is integrally fixed with a driving rod;

[0016] A spur gear is integrally fixed at the end of the driving rod away from the internal worm, and one side of the spur gear is exposed outside the top shaft frame plate and meshes with a vertical toothed plate fixedly assembled inside the vertical adjustment frame.

[0017] Preferably: The infrared thermal imaging structure includes a limiting frame fixedly installed on the outer side wall of the detection moving frame, and a reciprocating lead screw is rotatably installed inside one end of the limiting frame. Both ends of the reciprocating lead screw rotatably penetrate outside the limiting frame and are fixedly installed with hand wheels;

[0018] An adjusting vertical frame with a spiral drive sleeved on the reciprocating lead screw is movably arranged on the limiting frame, and a telescopic pipe is penetrated through the bottom of the adjusting vertical frame. The bottom end of the telescopic pipe is hermetically connected with a water suction pipe;

[0019] An electric cylinder is installed between the water suction pipe and the adjusting vertical frame, and the telescopic pipe can adjust the height position of the water suction pipe from the ground through the electric cylinder.

[0020] Preferably: The top end of the telescopic pipe is hermetically connected with a drainage pump fixedly installed on the adjusting vertical frame, and the drainage end of the drainage pump is connected with a drainage pipe. The end of the drainage pipe far from the drainage pump is connected with a valve body pipe.

[0021] Preferably: A clamping frame for clamping and positioning the valve body pipe is fixedly assembled on the outer wall of the adjusting vertical frame;

[0022] A vertical groove is opened on the inner wall of the adjusting vertical frame, and a load-bearing cross plate is movably arranged inside the vertical groove. An inner lead screw is rotatably installed inside the vertical groove. The top end of the inner lead screw rotatably penetrates outside the vertical groove and is integrally fixed with a cross-shaped hand lever.

[0023] Preferably: An infrared thermal imaging device is detachably assembled at one end of the adjusting load-bearing cross plate far from the adjusting vertical frame.

[0024] Preferably: A handle is integrally fixed on one side of the detection moving frame, and a controller is installed on the handle;

[0025] The controller includes a control device, and the control device is connected with an operation screen assembled on the handle. The control device is internally provided with a GPS positioning module, and a temperature compensation module for compensating the temperature when the temperature detector detects the temperature of the underground cable is also arranged in the control device;

[0026] The control device is internally provided with a moving record module for recording the detection moving track when the detection moving frame moves;

[0027] A storage battery is installed inside the middle part of the mobile detection moving frame, and tool boxes are arranged on both sides of the storage battery and installed on both sides inside the detection moving frame;

[0028] The control device is internally provided with a network module and a cloud service terminal wirelessly connected to the network module.

[0029] Preferably: The following operation steps are included:

[0030] Step 1: Cleaning of debris on the soil surface of the buried cable;

[0031] Start the servo motor to clean the debris on the soil surface of the buried cable, rotate the driving shaft rod to drive the cleaning auger to rotate, move the debris to the outside of the detection moving frame, and enable the cleaning auger to clean the debris on the soil surface of the buried cable;

[0032] Step 2: Temperature compensation method between the buried cable and the soil;

[0033] When the heat of the buried cable is transferred in the soil, a three-dimensional steady-state heat conduction model is constructed;

[0034] When a fault occurs in the buried cable, a specific amount of heat will be generated at the fault point, causing the cable temperature to rise, the resistance of the fault part to increase accordingly, and the heat generated when the current passes through to increase significantly, making the temperature of the fault point significantly higher than that of the normal part, thus facilitating the detection of abnormal fault points of the buried cable;

[0035] Step 3: Cleaning of water pits on the soil surface of the buried cable;

[0036] The infrared thermal imaging device is equipped with a drainage pump to effectively drain the accumulated water and reduce the detection error;

[0037] The position of the drainage pump can be adjusted horizontally. By rotating the handwheel to drive the reciprocating lead screw, the position of the vertical frame is adjusted to clean the soil water pit and reduce the interference of infrared thermal imaging shooting;

[0038] Step 4: Infrared thermal imaging height adjustment setting;

[0039] The shooting range of the height position of the infrared thermal imaging device can be adjusted by manually operating the cross handle. Rotating the cross handle will drive the inner screw rod to rotate, causing the load-bearing cross plate to rotate accordingly, and adjusting the height position of the infrared thermal imaging device.

[0040] Technical effects and advantages of the present invention:

[0041] In the present invention, the ground cleaning structure can remove the debris and accumulated water in the soil above and around the buried cable, avoid the interference of debris on heat conduction and the acceleration of heat dissipation by accumulated water, enable the heat of the cable to be transferred to the soil surface more smoothly, significantly improve the accuracy of infrared thermal imaging detection, help to more accurately locate the cable fault point. The ground cleaning structure cleans the debris on the soil of the buried cable at the bottom of the detection moving frame to one side, and this cleaning method further reduces the influence of debris on heat conduction, and improves the accuracy rate of infrared thermal imaging during cable fault detection from the side, ensuring that the detection result is more reliable.

[0042] In the process of cleaning the soil around the buried cable, the underground temperature detection component can, under the drive of the servo motor, insert the temperature detector into the soil around the buried cable to detect the soil temperature in real time. By combining the soil temperature and the cable thermal imaging detection data for temperature compensation, the interference of environmental factors on temperature measurement can be effectively eliminated, further improving the accuracy of cable thermal imaging detection and making the detection results more capable of reflecting the true condition of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic structural diagram of a cable fault detector provided by the present application;

[0044] Figure 2 is a schematic front structural diagram of a cable fault detector provided by the present application;

[0045] Figure 3 is a schematic structural diagram of the assembly bottom groove of a cable fault detector provided by the present application;

[0046] Figure 4 is a schematic disassembled structural diagram of a cable fault detector provided by the present application;

[0047] Figure 5 is a schematic structural diagram of the toolbox of a cable fault detector provided by the present application;

[0048] Figure 6 is a schematic structural diagram of the ground cleaning structure of a cable fault detector provided by the present application;

[0049] Figure 7 is a schematic top view structural diagram of the cleaning auger of a cable fault detector provided by the present application;

[0050] Figure 8 is a schematic structural diagram of the underground temperature detection component of a cable fault detector provided by the present application;

[0051] Figure 9 is a schematic structural diagram of the top shaft support plate of a cable fault detector provided by the present application;

[0052] Figure 10 is a schematic structural diagram of the spur gear of a cable fault detector provided by the present application;

[0053] Figure 11 is a cable fault detector provided by the present application Figure 10 schematic structural diagram at position A;

[0054] Figure 12 is a schematic structural diagram of the infrared thermal imaging structure of a cable fault detector provided by the present application;

[0055] Figure 13 It is a schematic structural diagram of an infrared thermal imaging device in a cable fault detector provided by this application;

[0056] Figure 14 It is a schematic structural diagram of a fine-tuning moving structure in a cable fault detector provided by this application;

[0057] Figure 15 It is a schematic structural diagram of a support plate in a cable fault detector provided by this application;

[0058] Figure 16 It is a schematic structural diagram of a pitch adjustment component in a cable fault detector provided by this application;

[0059] Figure 17 It is a schematic structural diagram of an adjustment limiting frame in a cable fault detector provided by this application;

[0060] Figure 18 It is a cable fault detector provided by this application Figure 17 The schematic structural diagram at position A in it.

[0061] In the figure:

[0062] 1. Detection moving frame;

[0063] 2. Ground cleaning structure; 201. Cleaning auger; 202. Worm gear 1; 203. Worm 1; 204. Driving shaft rod; 205. Servo motor; 206. Pulley 1;

[0064] 21. Underground temperature detection component; 2101. Test assembly frame; 2102. Vertical adjustment frame; 2103. Driven shaft rod; 2104. Pulley 2; 2105. Belt body; 2106. Worm body; 2107. Adjusting screw; 2108. Worm gear body; 2109. Top shaft frame plate; 2110. Vertical rod; 2111. Bottom cone rod; 2112. Temperature detector; 2113. Vertical tooth plate; 2114. Inner worm gear; 2115. Inner worm; 2116. Driving rod; 2117. Straight gear;

[0065] 3. Infrared thermal imaging structure; 301. Limiting frame; 302. Adjusting vertical frame; 303. Reciprocating lead screw; 304. Handwheel; 305. Telescopic tube; 306. Water suction pipe; 307. Electric cylinder; 308. Drainage pump; 309. Drainage pipe; 310. Valve body pipe; 311. Clamping frame; 312. Vertical groove; 313. Inner screw; 314. Load-bearing cross plate; 315. Infrared thermal imaging device;

[0066] 4. Fine-tuning moving structure; 401. Assembly shaft; 402. Support plate; 403. Moving wheel; 404. Tensile plate;

[0067] 41. Spacing adjustment component; 4101. Adjustment limiting frame; 4102. Bidirectional screw; 4103. Adjustment worm gear; 4104. Adjustment worm; 4105. Synchronous motor; 4106. Screw cylinder body;

[0068] 5. Handle; 6. Controller; 7. Toolbox; 8. Tool drawer; 9. Assembly bottom groove; 10. Side groove; 11. Storage battery. Specific embodiments

[0069] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The examples of the present invention are given for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles of the present invention and its practical applications, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0070] Example 1, please refer to Figures 1 to 5 , in this embodiment, a cable fault detector is provided, including: a detection support frame 1; an assembly bottom groove 9 is opened inside the lower end of the detection support frame 1, and side grooves 10 are provided on both sides of the assembly bottom groove 9 and are opened on the inner wall of the detection support frame 1;

[0071] A ground cleaning structure 2 for cleaning the soil on the surface of the buried cable is assembled inside the assembly bottom groove 9 of the detection support frame 1; the ground cleaning structure 2 is used to clean the soil on the surface of the buried cable to one side, which is beneficial to reducing interference during the detection of the fault point of the buried cable;

[0072] An infrared thermal imaging structure 3 for performing thermal imaging fault detection on the buried cable is assembled on the detection support frame 1; the infrared thermal imaging structure 3 is used to perform infrared thermal imaging detection on the fault point of the buried cable after being cleaned by the ground cleaning structure 2.

[0073] A handle 5 is integrally fixed on one side of the detection support frame 1, and a controller 6 is installed on the handle 5;

[0074] The controller 6 includes a control device, and the control device is connected to an operation screen assembled on the handle 5. The control device is internally provided with a GPS positioning module, and the control device is also provided with a temperature compensation module for compensating the temperature when detecting the temperature of the buried cable in cooperation with the temperature detector 2112;

[0075] When the heat of the buried cable is transferred in the soil, a three-dimensional steady-state heat conduction model is constructed. The cable is a cylindrical heat source, and the surrounding soil is a uniform medium with a thermal conductivity of λ;

[0076] Establish a coordinate system with the cable axis as the origin, and the temperature distribution T(x, y, z) is in the form of heat conduction;

[0077] First, the case of a cable in a steady state without internal heat sources:

[0078] Second, the case where current passes through the cable to generate heat:

[0079] Introduce an internal heat source term Q (heat generation rate per unit volume), combine geometric parameters such as the cable radius r and the assumed depth h, and boundary conditions (the ground temperature T 0， The temperature is constant at infinity) for this equation to obtain the temperature distribution function T(x, y, z) in the soil and detect the temperature compensation of the cable heat transfer;

[0080] The control device is built-in with a movement recording module that records the detection movement trajectory when detecting the movement of the support 1; this movement recording module can be mutually verified with the drawing of the buried cable, which is beneficial for detecting the area range of the buried cable.

[0081] A storage battery 11 is installed inside the middle part of the mobile detection support 1, and toolboxes 7 are installed on both sides of the storage battery 11 and on both sides inside the detection support 1; several tool drawers 8 for storing tools or devices for cable fault detection are arranged inside the toolbox 7;

[0082] The control device is built-in with a network module and a cloud service terminal wirelessly connected to the network module. The network module is provided with a SIM card module and a WiFi module. The SIM card module can be connected to the mobile network of the operator to achieve network connection, and the WiFi module can be connected to the WiFi hotspot near the device to connect to the network;

[0083] The mobile phone APP can be connected to the cloud service terminal to remotely view the data of the ground cable detection;

[0084] The detection support 1 is symmetrically provided with fine-tuning movement structures 4 along the middle part, and the two groups of fine-tuning movement structures 4 are respectively assembled on the outer wall of the detection support 1.

[0085] Example 2, please refer to Figures 6 to 11 , in this embodiment, a cable fault detector is provided;

[0086] The ground cleaning structure 2 includes three cleaning augers 201 rotatably arranged inside the assembly bottom groove 9 and its side groove 10. At both ends of the outer wall of the side groove 10 where the three cleaning augers 201 are located, a first worm gear 202 is fixedly assembled. The first worm gear 202 meshes with a first worm 203. The first worm 203 is fixedly assembled with a driving shaft 204. One end of the driving shaft 204 is connected to a servo motor 205. The servo motor 205 cooperates with the meshing of the first worm 203 and the first worm gear 202 to actively drive the three cleaning augers 201, and clean the surface of the buried cable to one side of the detection moving frame 1. The common rotation of the three cleaning augers 201 facilitates the efficient cleaning of the sundries affecting the infrared thermal imaging detection on the surface of the buried cable to one side of the detection moving frame 1.

[0087] The ground cleaning structure 2 includes an underground temperature detection component 21 assembled at the four corners of the detection moving frame 1. The underground temperature detection component 21 includes a test assembly frame 2101 fixedly installed inside the detection moving frame 1. At both ends of the test assembly frame 2101, a vertical adjustment frame 2102 located inside the detection moving frame 1 is integrally fixed. The number of the test assembly frames 2101 is two in total. The vertical adjustment frames 2102 assembled on the two test assembly frames 2101 are located inside the detection moving frame 1. The number of the vertical adjustment frames 2102 is four, and they are installed corresponding to the four corners of the detection moving frame 1.

[0088] A driven shaft 2103 is rotatably assembled inside the test assembly frame 2101. On the outer wall of the driven shaft 2103, two worm bodies 2106 and a second pulley 2104 are fixed. The two worm bodies 2106 are respectively fixedly installed on the outer walls at both ends of the driven shaft 2103. The worm bodies 2106 are integrally fixed with the driven shaft 2103 in the same direction. When the driven shaft 2103 rotates, the two worm bodies 2106 will be driven to rotate integrally.

[0089] A belt body 2105 is wound around the outside of the second pulley 2104. A first pulley 206 is wound around the bottom of the belt body 2105. The first pulley 206 is integrally fixed on the outer wall of the driving shaft 204. The driving shaft 204 and the driven shaft 2103 are friction-driven to rotate through the belt body 2105 between the first pulley 206 and the second pulley 2104, so that the driving shaft 204 and the driven shaft 2103 rotate synchronously.

[0090] An adjusting screw rod 2107 is rotatably installed inside the vertical adjusting frame 2102, and a worm gear body 2108 meshing with the worm body 2106 is fixedly installed on the outer wall of the bottom end of the adjusting screw rod 2107. The top end of the adjusting screw rod 2107 is rotatably assembled with a top shaft frame plate 2109, and the top shaft frame plate 2109 is vertically movably arranged inside the vertical adjusting frame 2102. The driving of the driven shaft rod 2103 can drive the adjusting screw rod 2107 to rotate through the meshing of the worm body 2106 with the worm gear body 2108.

[0091] A vertical rod 2110 is rotatably installed inside one end of the top shaft frame plate 2109 away from the adjusting screw rod 2107. A bottom cone rod 2111 is integrally fixed at the bottom end of the vertical rod 2110. A temperature detector 2112 for detecting the temperature of the soil inside the underground cable is installed inside the bottom of the vertical rod 2110. The bottom end of the vertical rod 2110 can be inserted into the soil of the underground cable through the bottom cone rod 2111, and the temperature detector 2112 can be inserted deep into the soil through the bottom cone rod 2111, so as to detect the temperature of the soil at different depths of the underground cable in real time, which is beneficial to testing the thermal conductivity of the soil around the cable, understanding the heat conduction characteristics of the soil. The thermal conductivities of different types of soil are different, and the thermal conductivity data can be used to correct the infrared thermal imaging detection results and improve the accuracy of judging the heating condition of the cable.

[0092] An internal worm gear 2114 is fixedly installed at a position inside the top shaft frame plate 2109 where the top end of the vertical rod 2110 is located. The internal worm gear 2114 meshes with an internal worm 2115, and a driving rod 2116 is integrally fixed to the internal worm 2115. When the driving rod 2116 rotates, it can drive the vertical rod 2110 to rotate synchronously through the meshing transmission of the internal worm 2115 and the internal worm gear 2115. The outer part of the vertical rod 2110 has a threaded groove, which is beneficial to the vertical rod 2110 to rotate and penetrate deep into the soil of the underground cable through the threaded groove.

[0093] A straight gear 2117 is integrally fixed at one end of the driving rod 2116 away from the internal worm 2115. One side of the straight gear 2117 is exposed outside the top shaft frame plate 2109 and meshes with a vertical tooth plate 2113 fixedly assembled inside the vertical adjusting frame 2102. When the top shaft frame plate 2109 moves inside the vertical adjusting frame 2102, the straight gear 2117 will mesh with the vertical tooth plate 2113, and the rotating straight gear 2117 will drive the driving rod 2116 to rotate inside the top shaft frame plate 2109.

[0094] Embodiment 3, please refer to Figures 12 to 13 , in this embodiment, a cable fault detector is provided with;

[0095] The infrared thermal imaging structure 3 includes a limiting frame 301 fixedly installed on the outer wall of the detection moving frame 1. One end of the limiting frame 301 is rotatably installed with a reciprocating lead screw 303. Both ends of the reciprocating lead screw 303 rotatably penetrate outside the limiting frame 301 and are fixedly installed with handwheels 304.

[0096] The reciprocating lead screw 303 can be manually driven to rotate by rotating the handwheel 304.

[0097] An adjusting vertical frame 302 is movably arranged on the limiting frame 301 and is sleeved on the reciprocating lead screw 303 through screw transmission. The bottom of the adjusting vertical frame 302 is provided with a telescopic tube 305 in a penetrating manner, and the bottom end of the telescopic tube 305 is hermetically connected with a water suction pipe 306.

[0098] An electric cylinder 307 is installed between the water suction pipe 306 and the adjusting vertical frame 302, and the height position of the water suction pipe 306 from the ground can be adjusted through the electric cylinder 307 for the telescopic tube 305.

[0099] The position of the water suction pipe 306 can be adjusted through the screw transmission cooperation between the adjusting vertical frame 302 and the reciprocating lead screw 303, which is beneficial to adjusting the horizontal distance position of the water suction pipe 306 relative to the detection moving frame 1.

[0100] The top end of the telescopic tube 305 is hermetically connected with a drainage pump 308 fixedly installed on the adjusting vertical frame 302. The drainage end of the drainage pump 308 is connected with a drainage pipe 309, and one end of the drainage pipe 309 far from the drainage pump 308 is connected with a valve body pipe 310.

[0101] The drainage pump 308 and the water suction pipe 306 cooperate to pump out the water source that affects the infrared thermal imaging detection in the puddle on the soil surface of the buried cable area to be detected and discharge it through the valve body pipe 310, reducing the heat dissipation accelerated by the accumulated water and affecting the accuracy of the infrared thermal imaging. It can make the heat of the cable transfer to the soil surface more smoothly and improve the detection accuracy.

[0102] A clamping frame 311 for clamping and positioning the valve body pipe 310 is fixedly assembled on the outer wall of the adjusting vertical frame 302.

[0103] The valve body pipe 310 can be placed on the clamping frame 311 through the drainage pipe 309.

[0104] A vertical groove 312 is opened on the inner wall of the adjusting vertical frame 302. A load-bearing cross plate 314 is movably arranged inside the vertical groove 312. An inner lead screw 313 is rotatably installed inside the vertical groove 312. The top end of the inner lead screw 313 rotatably penetrates outside the vertical groove 312 and is integrally fixed with a cross-shaped hand lever.

[0105] There is a screw drive relationship between the load-bearing cross plate 314 and the inner screw rod 313. When the inner screw rod 313 rotates through the cross handle rod, the load-bearing cross plate 314 will move along the vertical groove 312 of the adjustment vertical frame 302 through the screw drive of the inner screw rod 313 to adjust the height position of the load-bearing cross plate 314.

[0106] One end of the adjusted load-bearing cross plate 314 away from the adjustment vertical frame 302 is detachably assembled with an infrared thermal imaging device 315.

[0107] When the underground cable is operating normally, since there is resistance when current passes through the conductor, according to Joule's law (Q = I 2 RT, where Q is heat, I is current, R is resistance, and T is time), a certain amount of heat will be generated, causing the cable temperature to rise. When the cable fails, such as local short circuit, poor contact, insulation aging, etc., the resistance at the fault location will increase, and the heat generated when current passes through will increase significantly, resulting in the temperature at the fault point being significantly higher than that at the normal part, which is conducive to detecting abnormal fault points of the underground cable.

[0108] Embodiment 4, please refer to Figures 14 to 18 , in this embodiment, a component in a cable fault detector is provided;

[0109] The fine-tuning movement structure 4 includes an assembly shaft 401 fixedly installed on the outer wall of the detection moving frame 1, and a support plate 402 is rotatably installed outside the assembly shaft 401. A moving wheel 403 that can move on the ground is rotatably installed at one end of the support plate 402 away from the assembly shaft 401;

[0110] There are two groups of the support plates 402, and a stretching plate 404 is rotatably installed on each of the two groups of support plates 402;

[0111] A spacing adjustment component 41 is provided between the two stretching plates 404. The spacing adjustment component 41 includes an adjustment limiting frame 4101 movably arranged inside the two stretching plates 404. A bidirectional screw rod 4102 is rotatably installed inside the adjustment limiting frame 4101, and screw cylinders 4106 are sleeved on the outer sides of both ends of the bidirectional screw rod 4102 through screw drive. The screw cylinders 4106 are fixedly installed inside the stretching plates 404;

[0112] An adjustment worm gear 4103 is fixedly installed in the middle of the bidirectional screw rod 4102. The adjustment worm gear 4103 meshes with an adjustment worm 4104, and the adjustment worm 4104 is connected with a synchronous motor 4105. The synchronous motor 4105 is fixedly installed in the inner side wall of the adjustment limiting frame 4101.

[0113] According to the above embodiments, the working principle of the present invention is:

[0114] The detection support 1 can move along the path of the buried cable through the fine-tuning movement structure 4, and perform thermal imaging fault point detection on the buried cable through the infrared thermal imaging structure 3;

[0115] When the infrared thermal imaging structure 3 detects the buried cable, due to sundries and accumulated water in the soil above and around the cable, the sundries will interfere with heat conduction, and the accumulated water will accelerate heat dissipation, affecting the accuracy of infrared thermal imaging. The ground cleaning structure 2 can clean the area of the buried cable to be detected. After cleaning, the heat of the cable can be transferred to the soil surface more smoothly, improving the detection accuracy;

[0116] When cleaning, the sundries on the soil of the buried cable at the bottom of the detection support 1 are cleaned to one side of the detection support 1 through the ground cleaning structure 2, which is beneficial to increasing the accuracy rate of infrared thermal imaging in fault detection of the cable;

[0117] While cleaning the soil of the buried cable, the underground temperature detection component 21 can cooperate with the drive of the servo motor 205 to insert the temperature detector 2112 in the underground temperature detection component 21 into the soil of the buried cable, so as to detect the temperature of the soil near the buried cable, which is beneficial to temperature compensation according to the temperature of the soil and the thermal imaging detection temperature of the cable, and is beneficial to increasing the accuracy of cable thermal imaging detection;

[0118] When cleaning the sundries on the surface of the soil of the buried cable, it is easy to have a large difference in the height distance between the sundries in the soil of the buried cable and the detection support 1. The fine-tuning movement structure 4 can solve the distance between the ground cleaning structure 2 and the surface soil of the buried cable. On the other hand, the fine-tuning movement structure 4 can also cooperate with the infrared thermal imaging device 315 in the infrared thermal imaging structure 3 for secondary height adjustment;

[0119] When the ground cleaning structure 2 cleans the sundries on the soil of the buried cable from the detection support 1, the servo motor 205 is started. After the servo motor 205 is started, it drives the driving shaft rod 204 to rotate. The driving shaft rod 204 can drive the first worm 203 to rotate through the drive of the servo motor 205. Through the meshing of the first worm 203 with the first worm gear 202, the three cleaning augers 201 rotate inside the assembly bottom groove 9, and can helically agitate the sundries on the surface soil of the buried cable to the outside of the detection support 1;

[0120] When the driving shaft rod 204 rotates, the first pulley 206 rotates synchronously. Through the rotation of the first pulley 206, the belt body 2105 moves. The belt body 2105 rotates the second pulley 2104. Through the second pulley 2104, the driven shaft rod 2103 is driven to rotate. Through the rotation of the driven shaft rod 2103, the worm bodies 2106 at both ends can rotate. The rotating worm bodies 2106 meshingly drive the worm wheel body 2108. Through the worm wheel body 2108, the adjusting screw rod 2107 fixed thereon rotates. When the adjusting screw rod 2107 rotates, it can perform screw drive on the top shaft support plate 2109, so that the top shaft support plate 2109 moves downward along the adjusting screw rod 2107 inside the vertical adjusting frame 2102. When the top shaft support plate 2109 moves, the spur gear 2117 inside will mesh along the vertical tooth plate 2113. Through the meshing of the spur gear 2113 moving along the vertical tooth plate 2117, the spur gear 2117 drives the driving rod 2116 to rotate. Through the rotation of the driving rod 2116, the internal worm 2115 fixed thereon rotates. The rotating internal worm 2115 meshingly drives the internal worm wheel 2114, so that the vertical rod 2110 rotates synchronously with the internal worm wheel 2114. When the vertical rod 2110 descends, it can generate self-rotation, and the temperature detector 2112 assembled at the lower end of the vertical rod 2110 can be inserted into the soil of the buried cable. While the temperature detector 2112 detects the temperature of the buried cable, after the vertical rod 2110 is inserted into the soil in the area of the buried cable, it can also fix the cleaning auger 201 on the ground when cleaning the ground debris for the detection moving support 1;

[0121] The infrared thermal imaging structure 3 is provided with a drainage pump 308 and its components, which can extract and discharge the water source in the puddle on the soil of the buried cable in front of the detection moving support 1, reducing the error during the thermal imaging detection of the buried cable by the water source;

[0122] The position of the drainage pump 308 can be horizontally adjusted according to the position of the detection moving support 1. During the adjustment, by manually rotating the handwheel 304, the handwheel 304 drives the reciprocating lead screw 303 to rotate. The rotation of the reciprocating lead screw 303 can adjust the position of the adjusting vertical frame 302 in the horizontal position on the limiting frame 301;

[0123] The height position of the water suction pipe 306 from the puddle can be extended by the electric cylinder 307, so that the water suction pipe 306 extends into the puddle on the ground. The started drainage pump 308 discharges the water source in the puddle through the water suction pipe 306 through the valve body pipe 310 connected to the drain pipe 309 outside the detection moving support 1, which is beneficial to cleaning the water source in the puddle before the thermal imaging detection of the ground cable for the fault point;

[0124] The height position shooting range of the infrared thermal imaging device 315 can be adjusted by manually rotating the cross bar, causing the inner screw rod 313 to rotate with the cross bar. After the inner screw rod 313 rotates, it rotates the load-bearing cross plate 314, and the load-bearing cross plate 314 can drive the height position of the infrared thermal imaging device 315 to be adjusted.

[0125] When the fine-tuning moving structure 4 cooperates with the ground cleaning structure 2 to adjust the height position of the cleaning auger 201 from the ground, after starting the synchronous motor 4105, the synchronous motor 4105 rotates the adjusting worm 4104 after starting. The rotating adjusting worm 4104 meshes with the adjusting worm wheel 4103 to rotate. The rotation of the adjusting worm wheel 4103 synchronously drives the bidirectional screw rod 4102 to rotate. The rotating bidirectional screw rod 4102 is helically driven inside the screw cylinder 4106, causing the adjusting limit frame 4101 to move to the inside of the screw cylinder 4106. The support plate 402 can be rotated circumferentially along the assembly shaft 401, and the moving wheel 403 can be adjusted in terms of inclination, which is beneficial for adjusting the distance between the ground cleaning structure 2 and the soil surface of the buried cable, and for the secondary height adjustment of the infrared thermal imaging device 315 in the infrared thermal imaging structure 3.

[0126] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A cable fault detector, characterized in that: include: Detection moving frame; a mounting bottom groove is provided inside the lower end of the detection moving frame, and side grooves are provided on both sides of the mounting bottom groove and are provided on the inner wall of the detection moving frame; The inner side of the assembly bottom groove of the detection moving frame is equipped with a ground cleaning structure for cleaning the soil on the surface of the buried cable; The ground cleaning structure includes three groups of cleaning augers rotatably arranged on the inner sides of the assembly bottom groove and its side grooves, and the three groups of cleaning augers are fixedly equipped with a worm gear 1 on the outer walls of both ends of the side grooves, the worm gear 1 is meshed with a worm, the worm gear 1 is fixedly equipped with an active shaft, and one end of the active shaft is connected to a servo motor, and the servo motor cooperates with the meshing of the worm gear 1 and the worm gear 1 to actively drive the three groups of cleaning augers to clean the surface of the buried cable to the side of the detection moving frame; The detection moving frame is equipped with an infrared thermal imaging structure for performing thermal imaging fault detection on the buried cable.

2. A cable fault detector according to claim 1, characterized in that: The ground cleaning structure includes underground temperature detection components installed at the four corners of the detection moving frame, and the underground temperature detection component includes a test assembly frame fixedly installed on the inner side of the detection moving frame, and both ends of the test assembly frame are integrally fixed with a vertical adjustment frame located on the inner side of the detection moving frame; A driven shaft is rotatably mounted inside the test assembly frame, and two groups of worm bodies and a second pulley are fixed on the outer wall of the driven shaft. The two groups of worm bodies are respectively fixedly mounted on the outer walls at both ends of the driven shaft.

3. A cable fault detector according to claim 2, characterized in that: A belt body is wound around the outer side of the second belt pulley, and a belt pulley is wound around the bottom of the belt body. The first belt pulley is integrally fixed to the outer wall of the driving shaft.

4. A cable fault detector according to claim 2, characterized in that: An adjusting screw is rotatably mounted inside the vertical adjusting frame, and a worm wheel body meshing with the worm body is fixedly mounted on the outer wall of the bottom end of the adjusting screw, and a top shaft frame plate is rotatably mounted on the top end of the adjusting screw, and the top shaft frame plate is vertically movably arranged inside the vertical adjusting frame; A vertical rod is rotatably mounted on the inner side of one end of the top shaft frame plate away from the adjusting screw rod, a bottom cone rod is integrally fixed to the bottom end of the vertical rod, and a temperature detector for detecting the temperature in the soil of the buried cable is mounted on the inner side of the bottom of the vertical rod.

5. A cable fault detector according to claim 4, characterized in that: An inner worm wheel is fixedly installed at the top of the vertical rod at a position inside the top shaft frame plate, and the inner worm wheel is meshed with an inner worm, and the inner worm is integrally fixed with a driving rod; A spur gear is integrally fixed to one end of the driving rod away from the inner worm, and one side of the spur gear is exposed outside the top shaft frame plate and meshed with a vertical tooth plate fixedly assembled on the inner side of the vertical adjustment frame.

6. A cable fault detector according to claim 1, characterized in that: The infrared thermal imaging structure includes a limiting frame fixedly mounted on the outer side wall of the detection frame, and a reciprocating screw rod is rotatably mounted on the inner side of one end of the limiting frame, and both ends of the reciprocating screw rod are rotatably passed through the outside of the limiting frame and fixedly mounted with a hand wheel; The limiting frame is movably provided with an adjusting vertical frame with a spiral transmission sleeve arranged outside the reciprocating screw rod, and a telescopic tube is provided through the bottom of the adjusting vertical frame, and a water pumping pipe is sealed and connected to the bottom end of the telescopic tube; An electric cylinder is installed between the water pumping pipe and the adjusting vertical frame, and the telescopic pipe can adjust the height position of the water pumping pipe from the ground through the electric cylinder; A handle is integrally fixed to one side of the detection and moving frame, and a controller is installed on the handle; The controller includes a control device, and the control device is connected to a control screen mounted on the handle, the control device has a built-in GPS positioning module, and the control device is also provided with a temperature compensation module that cooperates with the temperature detector to perform temperature compensation when detecting the temperature of the buried cable; The control device has a built-in movement recording module for recording the movement trajectory of the detection rack when it moves; A battery is installed inside the middle of the mobile detection frame, and tool boxes are installed on both sides of the battery. The control device has a built-in network module, and a cloud service terminal wirelessly connected to the network module.

7. A cable fault detector according to claim 6, characterized in that: The top end of the telescopic tube is sealed and connected to a drainage pump fixedly mounted on the adjustment vertical frame, and the drainage end of the drainage pump is connected to a drainage pipe, and the end of the drainage pipe away from the drainage pump is connected to a valve body pipe.

8. A cable fault detector according to claim 6, characterized in that: The outer wall of the adjusting vertical frame is fixedly equipped with a clamping frame for clamping and positioning the valve body tube; A vertical groove is opened on the inner wall of the adjusting vertical frame, and a load-bearing horizontal plate is movably arranged inside the vertical groove, and an inner screw is rotatably installed inside the vertical groove, and the top end of the inner screw rotates and passes through the outside of the vertical groove, and a cross hand rod is fixed to the whole.

9. A cable fault detector according to claim 8, characterized in that: An infrared thermal imaging device is detachably mounted on one end of the adjustable load-bearing horizontal plate away from the adjustable vertical frame.

10. A working method using a cable fault detector according to claims 1 to 9, characterized in that: The following steps are involved: Step 1: Clean the debris on the soil surface of the buried cable; Start the servo motor to clean the debris on the soil surface of the buried cable, let the active shaft rotate to drive the cleaning auger to rotate, move the debris to the outside of the detection moving frame, and make the cleaning auger clean the debris on the soil surface of the buried cable; Step 2: Temperature compensation method between underground cable and soil; When the heat of the buried cable is transferred in the soil, a three-dimensional steady-state heat conduction model is constructed; When a buried cable fails, a specific amount of heat will be generated at the fault point, causing the cable temperature to rise. The resistance of the faulty part will increase accordingly, and the heat generated when the current passes through will increase significantly, making the temperature of the faulty part significantly higher than that of the normal part, thus facilitating the detection of abnormal faulty points of buried cables. Step 3: Clean the puddles on the soil surface of the buried cable; The infrared thermal imaging device is equipped with a drainage pump to effectively drain the accumulated water and reduce detection errors; The position of the drainage pump can be adjusted laterally, and the reciprocating screw rod can be driven by rotating the hand wheel to adjust the vertical frame position, clean up soil puddles, and reduce interference with infrared thermal imaging shooting; Step 4: Infrared thermal imaging height adjustment setting; The height position shooting range of the infrared thermal imaging device can be adjusted by manually operating the cross handle. Turning the cross handle will drive the inner screw to rotate, causing the load-bearing cross plate to rotate accordingly, thereby adjusting the height position of the infrared thermal imaging device.

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