A partial discharge test device based on cable joint

Abstract

The application discloses a kind of partial discharge test equipment based on cable joint, it is related to cable joint technical field, including hoop piece, it is annularly arranged, the inner wall of hoop piece is equipped with installation groove, one side of installation groove is equipped with material collecting groove, the outer wall of hoop piece is equipped with circular groove being communicated with installation groove;Ultrasonic probe is slidably connected in circular groove, for detecting cable joint.The application fixes the whole equipment on the outside of cable joint by hoop piece, power assembly can drive ultrasonic probe to move along the circumference of cable joint for scanning detection, simultaneously drives cleaning assembly to clean detection area before detection and scrape off residual coupling agent after detection, this design realizes the automatic preparation and cleaning of contact surface during detection, fundamentally avoids signal crosstalk and positioning distortion problem caused by residual coupling agent, ensures the accuracy and reliability of partial discharge ultrasonic detection result.

Description

Technical Field

[0001] This invention relates to the field of cable joint technology, and in particular to a partial discharge testing device based on cable joints. Background Technology

[0002] A cable connector is a specialized connection device used to connect two cables or to connect cables to equipment (such as transformers or switchgear). Its goal is to ensure that the electrical, mechanical, and protective performance of the connector meets or exceeds the level of the cable itself, forming an "invisible" and reliable connection point.

[0003] To ensure the quality of cable joints, partial discharge tests are performed. For factory inspection of cable joints, ultrasonic testing is a highly efficient, non-contact method for quality screening and defect location. Unlike on-site diagnosis, factory inspection offers a controllable environment, clear objectives, and more standardized procedures.

[0004] Because ultrasonic waves attenuate extremely quickly in air and propagate very unstablely, this directly affects the detection sensitivity, effective distance, and signal reliability. Therefore, a special ultrasonic coupling agent (paste) is applied to ultrasonic probes during use to ensure direct and tight coupling between the probe and the equipment surface.

[0005] However, in practical applications, some problems remain unresolved. The following are some common issues with partial discharge testing equipment based on cable joints: Residual coupling agent can create an unexpected acoustic wave conduction path. For example, when you apply the probe at point B, the ultrasonic signal may be "bridged" or reflected back to the previously tested area at point A through the residual coupling agent. This causes the signal received by the instrument to not originate entirely from the current test point B, resulting in positioning errors and signal confusion, severely affecting the test results. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] In view of the problems existing in the above and / or existing partial discharge testing equipment based on cable joints, the present invention is proposed.

[0008] Therefore, the problem to be solved by this invention is how to clean the cable joint during the ultrasonic probe detection of partial discharge, so as to avoid residual coupling agent forming an unexpected sound wave conduction channel and improve detection accuracy.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a partial discharge testing device based on a cable joint, comprising: a clamping member, which is arranged in a ring shape, with an installation groove on the inner wall of the clamping member, a material collection groove on one side of the installation groove, and a circular groove communicating with the installation groove on the outer wall of the clamping member; an ultrasonic probe, which is slidably connected in the circular groove for detecting the cable joint; a cleaning component, which is slidably connected in the installation groove for cleaning the cable joint, the cleaning component including a slider slidably disposed in the installation groove, with a receiving groove on the side of the slider near the cable joint, and rotating rollers rotatably connected to both sides of the receiving groove via one-way bearings, the two rotating rollers being connected by a friction belt, and a scraper for cleaning the cable joint connected to the end of one of the rotating rollers near the receiving groove via a transmission component, and a cleaning cloth detachably connected to the slider at the position between the scraper and the installation groove; and a power component disposed on the outside of the clamping member for driving the ultrasonic probe and the cleaning component to move.

[0010] As a preferred embodiment of the partial discharge testing equipment based on cable joints described in this invention, the power assembly includes a protective cover fixedly connected to the outer wall of the clamp, a sleeve fixedly connected to the clamp inside the protective cover, a sliding groove inside the sleeve and a sliding sleeve slidably connected thereto, the ultrasonic probe fixedly connected inside the sliding sleeve, a spring member for cleaning the scraper connected to the side of the sliding sleeve near the scraper via a connecting rod one, a linear motor connecting the side of the spring member away from the scraper to the protective cover, and an adjusting member for pushing the slider to move connected to the side of the sliding sleeve away from the scraper via a connecting rod two.

[0011] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, the elastic component includes a spring cylinder fixedly connected to the output shaft of the linear motor, the side wall of the spring cylinder being fixedly connected to the connecting rod, a push rod being connected inside the spring cylinder via a support spring, and an insert plate for cleaning the scraper being fixedly connected to one end of the push rod extending out of the spring cylinder, and a slot for the insert plate to pass through being provided on the outer wall of the clamp near the material collection trough.

[0012] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, the adjusting component includes an adjusting block fixedly connected to the slider. A track groove is formed on the side of the adjusting block away from the slider along the length direction of the adjusting block. A roller is rotatably connected in the track groove. A pressure rod is rotatably connected to one side of the roller. The side of the pressure rod away from the slider is fixedly connected to the connecting rod.

[0013] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, the width of the adjusting block gradually increases on the side away from the scraper, so that the adjusting block forms an arc-shaped part with a gradually changing width.

[0014] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, wherein: a storage box for storing coupling agent is fixedly connected to the side of the sleeve away from the clamp, a discharge port is opened in the storage box corresponding to the position of the slide groove, a cylinder is rotatably connected to the outer wall of the storage box, a threaded sleeve is rotatably connected to the middle of the cylinder through a one-way bearing, a screw is threadedly connected to the threaded sleeve, and a piston for extruding material is fixedly connected to one end of the screw located in the storage box.

[0015] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, the outer wall of the cylinder is machined with a spiral groove, a slip ring is slidably connected to the outer wall of the cylinder near the spiral groove, the inner wall of the slip ring contacts the spiral groove through a ball, and the outer wall of the slip ring is fixedly connected to the output shaft of the linear motor through a connecting rod.

[0016] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, wherein: a circular hole is provided through one side of the sliding sleeve, a one-way valve is fixedly connected to the side of the circular hole near the storage box, and a flow channel for extruding coupling agent is provided between the side of the sleeve away from the storage box and the clamping member, and the outlet of the flow channel is located on the side of the circular groove near the mounting groove.

[0017] As a preferred embodiment of the partial discharge test device based on cable joint described in this invention, a limiting ring is fixedly connected to the middle of the sliding sleeve, one side of the limiting ring is fixedly connected to the second connecting rod, a guide groove is provided on the side of the limiting ring away from the second connecting rod, and the first connecting rod is slidably connected in the guide groove.

[0018] As a preferred embodiment of the partial discharge testing device based on cable joints described in this invention, the transmission component includes two pulleys, one of which is fixedly connected to the rotating roller, and the other pulley is rotatably connected to the scraper via a rotating shaft. The two pulleys are connected by a toothed belt.

[0019] The beneficial effects of this invention are as follows: the device is fixed to the outside of the cable joint by the clamp, the power component can drive the ultrasonic probe to move around the circumference of the cable joint for scanning and detection, and at the same time drive the cleaning component to clean the detection area before detection and scrape off the residual coupling agent after detection. This design realizes automatic preparation and cleaning of the contact surface during the detection process, fundamentally avoiding the signal crosstalk and positioning distortion problems caused by coupling agent residue, and ensuring the accuracy and reliability of the partial discharge ultrasonic detection results. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a scene diagram of a partial discharge testing device based on a cable connector.

[0022] Figure 2 This is a structural diagram of a partial discharge testing device based on a cable connector.

[0023] Figure 3 This is a schematic diagram of the internal structure of a partial discharge testing device based on a cable connector.

[0024] Figure 4 This is a schematic diagram of the internal structure of the sleeve in a partial discharge testing device based on a cable connector.

[0025] Figure 5 This is an exploded view of the cleaning components in a partial discharge testing device based on a cable connector.

[0026] Figure 6 This is a schematic diagram of the adjusting component in a partial discharge testing device based on a cable connector.

[0027] Figure 7 This is a schematic diagram of the elastic element in a partial discharge testing device based on a cable connector.

[0028] Figure 8 This is a schematic diagram of the storage box in a partial discharge testing device based on a cable connector.

[0029] In the diagram: 1. Clamp; 2. Ultrasonic probe; 3. Cleaning assembly; 31. Slider; 32. Rotary roller; 33. Friction belt; 34. Transmission component; 341. Pulley; 342. Toothed belt; 35. Scraper; 36. Cleaning cloth; 4. Power assembly; 41. Protective cover; 42. Sleeve; 43. Sliding sleeve; 44. Linkage rod one; 45. Elastic component; 451. Spring cylinder; 452. Support spring; 453. Push rod; 454. Insert plate; 46. Linear motor; 47. Linkage rod two; 4 8. Adjusting component; 481. Adjusting block; 482. Roller; 483. Pressure rod; 5. Mounting groove; 6. Collection trough; 7. Circular groove; 8. Receiving groove; 9. Slide groove; 10. Slot; 11. Track groove; 12. Storage box; 13. Discharge port; 14. Cylinder; 15. Threaded sleeve; 16. Screw; 17. Piston; 18. Spiral groove; 19. Slip ring; 20. Ball bearing; 21. Connecting rod three; 22. Circular hole; 23. Check valve; 24. Flow channel; 25. Limiting ring; 26. Guide groove. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, referring to Figures 1 to 8 This is the first embodiment of the present invention, which provides a partial discharge testing device based on a cable joint. The device includes a clamp 1, an ultrasonic probe 2, a cleaning component 3, and a power component 4. The clamp 1 secures the entire device to the outside of the cable joint. The power component 4 drives the ultrasonic probe 2 to move circumferentially along the cable joint for scanning and detection. Simultaneously, it drives the cleaning component 3 to clean the detection area before detection and scrape off residual coupling agent after detection. This design achieves automatic preparation and cleaning of the contact surface during the detection process, fundamentally avoiding signal crosstalk and positioning distortion caused by coupling agent residue, and ensuring the accuracy and reliability of the partial discharge ultrasonic detection results.

[0034] Specifically, the clamp 1 is arranged in a ring shape and is used to openably and close to clamp the cable joint. The inner wall of the clamp 1 has an installation groove 5, and one side of the installation groove 5 has a material collection groove 6 for collecting scraped waste. The outer wall of the clamp 1 has a circular groove 7 that communicates with the installation groove 5, providing a channel for the movement of the ultrasonic probe 2.

[0035] The ultrasonic probe 2 is slidably connected in the circular groove 7 and is used to detect ultrasonic signals generated by partial discharge of the cable joint.

[0036] The cleaning component 3, slidably connected within the mounting groove 5, is used to clean the surface of the cable connector after ultrasonic probe 2 detection. The cleaning component 3 includes a slider 31 slidably disposed within the mounting groove 5. A receiving groove 8 is formed on the side of the slider 31 near the cable connector. Two rotating rollers 32 are rotatably connected to both sides of the receiving groove 8 via one-way bearings. The two rotating rollers 32 are connected by a friction belt 33. The outer surface of the friction belt 33 has a high coefficient of friction, allowing it to contact the surface of the cable connector. One end of the rotating roller 32 near the receiving groove 8 is connected to a scraper 35 for cleaning the cable connector via a transmission component 34. When the friction belt 33 is driven by the friction of the cable connector, causing the rotating roller 32 to rotate unidirectionally, the transmission component 34 can rotate the scraper 35, causing its blade to press tightly against the surface of the cable connector. A cleaning cloth 36 is connected to the slider 31 at the position between the scraper 35 and the mounting groove 5, used for final wiping after the scraper 35 removes the coupling agent, ensuring the surface of the detection point is clean.

[0037] The transmission component 34 includes two pulleys 341. One pulley 341 is fixedly connected to the aforementioned roller 32, and the other pulley 341 is rotatably connected to the root of the scraper 35 via a rotating shaft. The two pulleys 341 are connected by a toothed belt 342, which can accurately convert the unidirectional rotation of the roller 32 into the fixed-axis oscillation of the scraper 35, ensuring that the angle of the scraper 35 is controllable during operation.

[0038] To ensure the cleaning effect of the coupling agent, the cleaning cloth 36 needs to be soaked in electronic contact cleaning agent during use. As the cleaning cloth 36 is used, it will gradually become dirty, affecting the subsequent cleaning effect. Therefore, the cleaning cloth 36 is detachably connected to the slider 31 by means of buckles and threads to ensure that the cleaning cloth 36 can be flexibly replaced and to ensure the cleaning effect of the cable connector surface.

[0039] The power assembly 4, which is located on the outside of the clamp 1, is used to drive the ultrasonic probe 2 and the cleaning assembly 3 to move in a coordinated manner in the circumferential direction of the clamp 1.

[0040] The cable connectors are cable accessories that have passed factory testing; their surfaces are smooth and free of dust and dirt, which could affect the testing. The ultrasonic probe 2 is existing technology, and the working principles described in this section are all existing technologies, which are clearly understood by those skilled in the art and will not be elaborated upon here.

[0041] Example 2, refer to Figures 3-7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0042] Specifically, the power assembly 4 includes a protective cover 41 fixedly connected to the outer wall of the clamp 1. Inside the protective cover 41, there is a sleeve 42 fixedly connected to the clamp 1. The sleeve 42 has a sliding groove 9 and a sliding sleeve 43 is slidably connected thereto. An ultrasonic probe 2 is fixedly connected inside the sliding sleeve 43. The side of the sliding sleeve 43 closest to the scraper 35 is connected to a spring member 45 for cleaning the scraper 35 via a first connecting rod 44. The side of the spring member 45 away from the scraper 35 is connected to the protective cover 41 via a linear motor 46. The side of the sliding sleeve 43 away from the scraper 35 is connected to an adjusting member 48 for pushing the slider 31 to move via a second connecting rod 47.

[0043] A limiting ring 25 is fixedly connected to the middle of the sliding sleeve 43. One side of the limiting ring 25 is fixedly connected to the second connecting rod 47. A guide groove 26 is provided on the side of the limiting ring 25 away from the second connecting rod 47. The first connecting rod 44 is slidably connected in the guide groove 26.

[0044] The output shaft of the linear motor 46 extends and retracts, driving the elastic element 45 to move as a whole. When the elastic element 45 moves, it first slides within the guide groove 26 of the limiting ring 25 via the connecting rod 44. During this stage, power is not transmitted to the limiting ring 25, so the sliding sleeve 43 and the ultrasonic probe 2 remain stationary. This design makes the output action of the power assembly 4 sequential: it prioritizes driving the cleaning-related components, and then drives the detection components.

[0045] The elastic component 45 includes a spring cylinder 451 fixedly connected to the output shaft of the linear motor 46. The side wall of the spring cylinder 451 is fixedly connected to the connecting rod 44, so that the movement of the spring cylinder 451 can drive the connecting rod 44. A push rod 453 is connected inside the spring cylinder 451 via a support spring 452. One end of the push rod 453 extending out of the spring cylinder 451 is fixedly connected to an insert plate 454 for cleaning the scraper 35. A slot 10 for the insert plate 454 to pass through is provided on the outer wall of the clamp 1 near the collection trough 6. When the insert plate 454 is pushed through the slot 10 by the push rod 453, it can scrape against the cutting edge of the scraper 35 that has retracted to the vicinity of the collection trough 6, thereby removing the coupling agent residue adhering to the scraper 35, preventing its accumulation from affecting the next scraping effect, and also guiding the residue into the collection trough 6.

[0046] The adjusting component 48 includes an adjusting block 481 fixedly connected to the slider 31. A track groove 11 is formed along the length of the adjusting block 481 on the side away from the slider 31. A roller 482 is rotatably connected within the track groove 11. A pressure rod 483 is rotatably connected to one side of the roller 482. The side of the pressure rod 483 away from the slider 31 is fixedly connected to a connecting rod 47. When the connecting rod 47 moves with the limiting ring 25, force is applied to the track groove 11 of the adjusting block 481 through the pressure rod 483 and the roller 482. Because the width of the adjusting block 481 gradually increases on the side away from the scraper 35, the adjusting block 481 forms a gradually wide arc shape. When the roller 482 rolls within the track groove 11 and applies lateral pressure, it drives the adjusting block 481 and the entire slider 31 to slide along the mounting groove 5. Meanwhile, since there is an angle between the moving direction of slider 31 and the force direction of roller 482, a tangential torque will be generated on clamp 1 according to the principle of mechanical decomposition. If static friction is generated between friction belt 33 and cable joint surface due to one-way bearing lock, this torque will drive the entire clamp 1 to rotate slightly around the cable joint, so that the detection point of ultrasonic probe 2 can avoid the wet and slippery area that has just been cleaned and may still be interfering, and move to the next clean detection starting position.

[0047] Example 3, referring to Figure 4 and Figure 8 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0048] Specifically, a storage box 12 for storing coupling agent is fixedly connected to the side of the sleeve 42 away from the clamp 1. A discharge port 13 is provided inside the storage box 12 corresponding to the position of the slide groove 9 for replenishing coupling agent into the slide groove 9. A cylinder 14 is rotatably connected to the outer wall of the storage box 12, and a threaded sleeve 15 is rotatably connected to the middle of the cylinder 14 via a one-way bearing. A screw 16 is threadedly connected to the threaded sleeve 15, and a piston 17 for extrusion is fixedly connected to one end of the screw 16 located in the storage box 12. When the one-way bearing is locked, the rotation of the threaded sleeve 15 drives the screw 16 and piston 17 to move linearly, thereby extruding the coupling agent from the storage box 12.

[0049] The outer wall of cylinder 14 is machined with a helical groove 18, and a slip ring 19 is slidably connected to the outer wall of cylinder 14 near the helical groove 18. The inner wall of slip ring 19 contacts the helical groove 18 through balls 20, and the outer wall of slip ring 19 is fixedly connected to the output shaft of linear motor 46 through connecting rod 21. When the output shaft of linear motor 46 reciprocates, it drives slip ring 19 to move linearly through connecting rod 21, and the balls 20 roll in the helical groove 18, thereby converting the linear motion of slip ring 19 into the forward and reverse rotation of cylinder 14. Since cylinder 14 and threaded sleeve 15 are connected by a one-way bearing, the one-way bearing is set to lock only when cylinder 14 rotates in a specific direction (i.e., driving threaded sleeve 15 to rotate), and disengage when rotating in the opposite direction. Therefore, one reciprocating motion of the output shaft of linear motor 46 corresponds to one forward and one reverse rotation of cylinder 14. When the output shaft of the linear motor 46 extends, the cylinder 14 rotates forward, and the one-way bearing unlocks, so that the coupling agent will not be squeezed out during this rotation; when the output shaft of the linear motor 46 retracts, the cylinder 14 rotates in reverse, and the one-way bearing locks the drive threaded sleeve 15 and piston 17 to perform one extrusion stroke, thus realizing the one-way transmission of power and quantitative supply.

[0050] A circular hole 22 is provided through one side of the sliding sleeve 43. A one-way valve 23 is fixedly connected to the side of the circular hole 22 near the storage box 12, allowing fluid to flow in only one direction within the chute 9. A flow channel 24 for extruding coupling agent is provided between the side of the sleeve 42 away from the storage box 12 and the clamp 1. The outlet of the flow channel 24 is located on the side of the circular groove 7 near the mounting groove 5. When the sliding sleeve 43 slides towards the clamp 1 within the chute 9, it squeezes the coupling agent at its front, forcing the coupling agent to be extruded from the outlet through the flow channel 24 and pre-coated onto the surface of the cable connector to be inspected.

[0051] In use, first install the cable connector to be tested in the middle of the sample cable, and then connect the sample cable to the partial discharge test circuit. Then, open clamp 1, slip it over the cable connector, and lock it in place, completing the installation and test preparation of the equipment.

[0052] The pulse current method detection system is activated to apply a test voltage to the cable joint, and the linear motor 46 is started simultaneously. The linear motor 46 first moves the elastic element 45. At this time, the connecting rod 44 slides within the guide groove 26 of the limiting ring 25, while the sliding sleeve 43 and ultrasonic probe 2 remain stationary. Until the insert plate 454 passes through the slot 10 and contacts the scraper 35, the connecting rod 44 moves to the end of the guide groove 26. The thrust output by the linear motor 46 then acts on the limiting ring 25 through the connecting rod 44, thereby causing the sliding sleeve 43 and ultrasonic probe 2 to begin moving along the slide groove 9 towards the cable joint. As the insert plate 454 continues to move forward after contacting the scraper 35, the spring cylinder 451 compresses the internal support spring 452 to store energy.

[0053] As the limiting ring 25 begins to move, the connecting rod 47 fixed to it pushes the pressure rod 483 and the roller 482, pressing the track groove 11 of the adjusting block 481. Since the rotating roller 32 of the cleaning component 3 is locked by the one-way bearing at this time, static friction is generated between the friction belt 33 and the surface of the cable joint. The arc-shaped inclined surface of the adjusting block 481 converts part of the axial thrust into a torque that causes the clamp 1 to rotate around the cable joint, thereby causing the entire device (including the ultrasonic probe 2) to rotate by a small angle, ensuring that the ultrasonic probe 2 avoids the cleaning component 3.

[0054] As the sliding sleeve 43 moves, the couplant pre-stored in its front groove 9 is squeezed out through the flow channel 24 from the outlet of the circular groove 7 and coated on the surface of the cable joint. When the ultrasonic probe 2 extends out of the circular groove 7 and contacts the cable joint, its front end face evenly presses the couplant apart, forming a good sound wave conduction channel. Subsequently, partial discharge ultrasonic signal detection is performed at this point, thereby effectively improving the signal-to-noise ratio and detection accuracy.

[0055] After the detection at this point is completed, the linear motor 46 runs in reverse, pulling the elastic element 45 to reset. In the initial stage, the connecting rod 44 slides in reverse within the guide groove 26, and the limiting ring 25 and the sliding sleeve 43 do not move temporarily. At this time, the previously compressed support spring 452 is released, pushing the push rod 453 and the insert plate 454 to quickly reset. After the connecting rod 44 slides to the other end of the guide groove 26, the force of the linear motor 46 continues to pull the limiting ring 25, the sliding sleeve 43, and the ultrasonic probe 2 to reset.

[0056] As the sliding sleeve 43 and ultrasonic probe 2 reset, connecting rod 47 pulls back the adjusting block 481 and cleaning assembly 3 via pressure rod 483 and roller 482. During this reset stroke, the friction between friction belt 33 and the cable joint surface drives roller 32 to rotate over the resistance of one-way bearing (at this time, the one-way bearing is in a rotatable state). The rotation of roller 32 drives scraper 35 to flip through transmission component 34 composed of pulley 341 and toothed belt 342, so that its sharp edge is in close contact with the surface of cable joint. As cleaning assembly 3 moves, scraper 35 scrapes off the coupling agent remaining on the surface of the detection point, followed by wiping with cleaning cloth 36 to ensure surface cleanliness and completely eliminate the risk of signal crosstalk. Finally, cleaning assembly 3 is fully reset, and the cutting edge of scraper 35 just abuts against the acute angle formed by the intersection of the side wall of collection trough 6 and the inner wall of clamp 1, guiding the scraped coupling agent residue into collection trough 6 for centralized storage.

[0057] During the entire retraction of the output shaft of the linear motor 46, the slip ring 19 moves via the connecting rod 21, the ball bearing 20 rolls along the spiral groove 18, driving the cylinder 14 to reverse. At this time, the one-way bearing locks, causing the threaded sleeve 15 to rotate, which in turn pushes the screw 16 and piston 17 forward, quantitatively squeezing the fresh coupling agent in the storage box 12 into the front cavity of the chute 9 through the discharge port 13, preparing for the next coupling agent coating test. At the same time, when the slip sleeve 43 extends again, it squeezes out this part of the coupling agent through the flow channel 24, while the inside of the slip sleeve 43 is replenished with coupling agent from the rear end of the chute 9 through the one-way valve 23, realizing the cyclic replenishment and precise supply of coupling agent.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A partial discharge testing device based on a cable joint, characterized in that: include, The clamp (1) is arranged in a ring shape and is used to clamp the cable joint in an openable manner. The inner wall of the clamp (1) is provided with an installation groove (5), and a material collection groove (6) is provided on one side of the installation groove (5). The outer wall of the clamp (1) is provided with a circular groove (7) that communicates with the installation groove (5). An ultrasonic probe (2) is slidably connected in a circular groove (7) for detecting cable joints; The cleaning component (3) is slidably connected in the mounting groove (5) for cleaning cable connectors. The cleaning component (3) includes a slider (31) slidably disposed in the mounting groove (5). A receiving groove (8) is provided on the side of the slider (31) near the cable connector. Rollers (32) are rotatably connected to both sides of the receiving groove (8) through one-way bearings. The two rollers (32) are connected by a friction belt (33). The end of one of the rollers (32) near the receiving groove (8) is connected to a scraper (35) for cleaning cable connectors through a transmission component (34). A cleaning cloth (36) is detachably connected to the slider (31) at the position between the scraper (35) and the mounting groove (5). The power assembly (4), located on the outside of the clamp (1), is used to drive the ultrasonic probe (2) and the cleaning assembly (3) to move. The power assembly (4) includes a protective cover (41) fixedly connected to the outer wall of the clamp (1). Inside the protective cover (41) is a sliding sleeve (43) connected by a linear motor (46). The sliding sleeve (43) is connected by a connecting rod (47) to an adjusting member (48) for pushing the slider (31) to move. The adjusting component (48) includes an adjusting block (481) fixedly connected to the slider (31). A track groove (11) is provided on the side of the adjusting block (481) away from the slider (31) along the length direction of the adjusting block (481). A roller (482) is rotatably connected in the track groove (11). A pressure rod (483) is rotatably connected on one side of the roller (482). The side of the pressure rod (483) away from the slider (31) is fixedly connected to the connecting rod (47). The width of the adjusting block (481) gradually increases on the side away from the scraper (35), so that the adjusting block (481) forms an arc-shaped part with a gradually changing width.

2. The partial discharge testing equipment based on cable joints as described in claim 1, characterized in that: The protective cover (41) is provided with a sleeve (42) fixedly connected to the clamp (1). A groove (9) is provided in the sleeve (42). The sliding sleeve (43) is slidably connected in the groove (9). The ultrasonic probe (2) is fixedly connected in the sliding sleeve (43). The side of the sliding sleeve (43) near the scraper (35) is connected to an elastic member (45) for cleaning the scraper (35) through a connecting rod (44). The side of the elastic member (45) away from the scraper (35) is connected to the linear motor (46).

3. The partial discharge testing equipment based on cable joints as described in claim 2, characterized in that: The elastic component (45) includes a spring cylinder (451) fixedly connected to the output shaft of the linear motor (46). The side wall of the spring cylinder (451) is fixedly connected to the connecting rod (44). A push rod (453) is connected inside the spring cylinder (451) through a support spring (452). One end of the push rod (453) extending out of the spring cylinder is fixedly connected to an insert plate (454) for cleaning the scraper (35). A slot (10) for the insert plate (454) to pass through is provided on the outer wall of the clamp component (1) near the material collection trough (6).

4. The partial discharge testing equipment based on cable joints as described in claim 2, characterized in that: The sleeve (42) is fixedly connected to a storage box (12) for storing coupling agent on the side away from the clamp (1). The storage box (12) has a discharge port (13) at the position corresponding to the slide (9). The outer wall of the storage box (12) is rotatably connected to a cylinder (14). The middle part of the cylinder (14) is rotatably connected to a threaded sleeve (15) through a one-way bearing. The threaded sleeve (15) is threadedly connected to a screw (16). The screw (16) is fixedly connected to a piston (17) for extruding material at one end of the storage box (12).

5. The partial discharge testing equipment based on cable joints as described in claim 4, characterized in that: The outer wall of the cylinder (14) is machined with a spiral groove (18). A slip ring (19) is slidably connected to the outer wall of the cylinder (14) near the spiral groove (18). The inner wall of the slip ring (19) contacts the spiral groove (18) through a ball (20). The outer wall of the slip ring (19) is fixedly connected to the output shaft of the linear motor (46) through a connecting rod (21).

6. The partial discharge testing equipment based on cable joints as described in claim 5, characterized in that: A circular hole (22) is provided through one side of the sliding sleeve (43). A one-way valve (23) is fixedly connected to the side of the circular hole (22) near the storage box (12). A flow channel (24) for extruding coupling agent is provided between the side of the sleeve (42) away from the storage box (12) and the clamp (1). The outlet of the flow channel (24) is opened on the side of the circular groove (7) near the mounting groove (5).

7. The partial discharge testing equipment based on cable joints as described in claim 2, characterized in that: A limiting ring (25) is fixedly connected to the middle of the sliding sleeve (43). One side of the limiting ring (25) is fixedly connected to the second connecting rod (47). A guide groove (26) is provided on the side of the limiting ring (25) away from the second connecting rod (47). The first connecting rod (44) is slidably connected in the guide groove (26).

8. The partial discharge testing equipment based on cable joints as described in claim 1, characterized in that: The transmission component (34) includes two pulleys (341), one of which is fixedly connected to the roller (32), and the other pulley (341) is rotatably connected to the scraper (35) via a rotating shaft. The two pulleys (341) are connected by a toothed belt (342).

Images