Distance-adjustable partial discharge sensor probe clamping device and partial discharge detector

Abstract

The invention provides a distance-adjustable partial discharge sensor probe clamping device and a partial discharge detector, and belongs to the technical field of partial discharge detection. Comprising an outer shell, an inner shell, a displacement table, a clamping back plate, an operation assembly and universal wheels. The outer surface of the shell is provided with universal wheel fixing supporting foot structures extending outwards and used for being connected with universal wheels, the upper side is provided with a distance observation window, and the outer surface of the rear side is provided with a connecting disc structure and an angle limiting baffle structure. The operating assembly is movably connected with the connecting disc structure; the displacement table is mounted on the inner surface of the shell; the inner shell is fixedly connected with a sliding block in the displacement table; the clamping back plate is fixedly connected with the upper side wall of the inner shell and is provided with a clamping buckle with a spring mechanism; and the probe of the partial discharge sensor is fixed under the elastic action of the clamping buckle. Each movable end of the universal wheel and a contact on the surface of the shell of the tested equipment are positioned on the same plane; the operating assembly drives the device to stably move on the surface of the tested equipment under the action of external force, and the displacement table can adjust the distance between the probe and the tested equipment.

Description

Technical Field

[0001] The invention relates to the technical field of partial discharge detection, and in particular to a partial discharge sensor probe clamping device with adjustable distance and a partial discharge detector. Background Art

[0002] Many high-voltage electrical cabinets, such as control cabinets, distribution cabinets, switch cabinets, etc., need to use a detector sensor probe to scan the vertical surface of the cabinet to detect the cabinet status information, such as partial discharge detectors, etc. The traditional detection method is to hold the sensor probe in hand, or fix it on the head of an insulating rod, close to the cabinet for detection.

[0003] The handheld sensor probe detection method is dangerous when detecting high-voltage electrical cabinets. If the equipment discharges abnormally, it may cause safety hazards to people. The method of fixing the detection method on the insulating rod head is cumbersome and rough. It has the same problem as the handheld probe. The angle and distance between the sensor probe and the cabinet are not fixed. There is great instability during the movement, which affects the precision and accuracy of the detection results. Summary of the invention

[0004] In view of this, the present invention provides a partial discharge sensor probe clamping device with adjustable distance and a partial discharge detector, so that the sensor probe can maintain a fixed angle and distance with the cabinet during the detection process and is always parallel to the cabinet surface, thereby improving the probe movement stability and improving the precision and accuracy of the detection results.

[0005] The technical solution adopted by the embodiment of the present invention to solve the technical problem is: A partial discharge sensor probe clamping device with adjustable distance is used for carrying a partial discharge sensor and moving it on a plane parallel to the surface of a shell of a device under test. The device comprises: an outer shell (1), an inner shell (2), a displacement platform (3), a clamping back plate (4), an operating assembly and a set of universal wheels (5); The outer shell (1) is open at the front side, and the outer surfaces of the left and right side panels have a universal wheel fixing foot structure (11) extending outward, the upper side panel is provided with a distance observation window (12), and the outer surface of the rear side panel is provided with a connecting plate structure (13) and an angle limit baffle structure (14); the rear side panel is provided with a knob through hole (15); the outer edge of the distance observation window (12) has a scale line; the distance observation window (12) of the outer shell (1) is a long strip structure, and the opening direction is parallel to the movement direction of the inner shell (2); The fixed end of the universal wheel (5) is fixedly connected in the universal wheel fixed support foot structure (11), and each movable end and the contact point on the surface of the housing of the device under test are located in the same plane; The operating assembly is composed of a connecting shaft (61), a rod head connecting piece (62) and an electrically insulating operating rod (63); the front end of the rod head connecting piece is movably connected to the connecting plate structure (13) through the connecting shaft, and the rear end is fixedly connected to the electrically insulating operating rod; the angle limiting baffle structure (14) is used to limit the rotation range of the rod head connecting piece; The displacement stage (3) is mounted on the inner surface of the right side plate of the outer shell (1); the right side plate of the inner shell (2) is fixedly connected to a slider in the displacement stage (3); an adjustment knob of the displacement stage (3) extends from a knob through hole (15) to the outside of the outer shell (1); and the inner shell (2) reciprocates in a direction perpendicular to the surface of the shell of the device under test; The front side of the inner shell (2) is open, a wire through hole (21) is provided on the left side wall, and the outer surface of the upper side plate has a reference line structure (22); The clamping back plate (4) is an L-shaped plate composed of a bottom plate (41) and a side baffle (42), wherein the outer wall of the bottom plate (41) is fixedly connected to the inner surface of the upper side wall of the inner shell (2), and a clamping buckle (43) with a spring mechanism is installed on the bottom plate (41); under the elastic force of the clamping buckle (43), the clamping buckle (43) and the side baffle (42) jointly clamp the probe of the partial discharge sensor; and the output wire of the partial discharge sensor passes through the wire through hole (21).

[0006] Preferably, the distance observation window (12) of the outer shell (1) is a long strip structure, and its opening direction is parallel to the movement direction of the inner shell (2); The connecting disk structure (13) is composed of a pair of connecting disks arranged in parallel, and a connecting shaft mounting hole is provided on the connecting disks; a limiting groove is provided on the rear side plate of the housing (1), and the two connecting disks are located on the upper and lower sides of the limiting groove, and two angle limiting baffle structures (14) are located on the left and right sides of the limiting groove; In the operating assembly, the front end outer edge of the rod head connecting member (62) is arc-shaped, the front end structural width matches the width of the limiting groove, and the front end of the rod head connecting member (62) is inserted into the limiting groove; the front end of the rod head connecting member (62) is provided with a connecting shaft through hole, the connecting shaft (61) is installed in the connecting shaft installation hole of the connecting disk structure (13) and the connecting shaft through hole of the rod head connecting member (62), and the rod head connecting member (62) and the connecting disk structure (13) are both rotatably connected to the connecting shaft (61); when the rod head connecting member (62) rotates left and right, the angle limiting baffle structures (14) located on the left and right sides limit the rotation angle of the rod head connecting member (62); A mounting groove is axially provided at the rear end of the rod head connecting piece (62), and the electrical insulating operating rod (63) is inserted into the mounting groove. The electrical insulating operating rod (63) and the rod head connecting piece (62) are fixedly connected by bolts; A universal wheel fixing foot structure (11) is respectively arranged on the upper and lower parts of the outer surface of the left side plate of the housing (1), and a universal wheel fixing foot structure (11) is respectively arranged on the upper and lower parts of the outer surface of the right side plate of the housing (1), and the left and right sides are symmetrically arranged so that the four universal wheels (5) are located together and parallel to the shell surface of the device under test and are evenly distributed.

[0007] Preferably, with the plane where the housing surface of the device under test is located as a reference, the rotation angle of the rod head connecting member (62) is 30° to 150°; Assuming that the overall height of the device from the bottom of the universal wheel to the axis of the connecting shaft is H, the fixed axis spacing of the universal wheel is L, and the minimum value of the limiting angle between the limit baffle and the rod head connecting member (62) is A, then: H / sI < L / 2.

[0008] Preferably, the displacement platform (3) comprises a back plate (31), two fixing members (32), two supporting columns (33), an adjusting screw rod (34), a displacement slider (35), and an adjusting knob (36), wherein: The outer surface of the back plate (31) is fixedly mounted on the inner surface of the right side wall of the housing (1); two fixing members (32) are fixedly mounted on the inner surface of the back plate (31) and are located at the front and rear ends of the back plate (31); The displacement slider (35) is placed between the front fixing member (321) and the rear fixing member (322); two support column through holes and one screw rod through hole are provided on the displacement slider (35); the screw rod through hole is located between the two support column through holes, and the displacement slider (35) and the adjusting screw rod (34) are in a threaded connection relationship; a support column (33) is inserted into the support column through hole, and the displacement slider (35) and the support column (33) are in a sliding connection relationship; One end of the adjusting screw rod (34) is rotatably connected to the screw rod placement groove of the front fixing member (321), and the other end passes through the displacement slider (35) and the rear fixing member (322) in sequence and is fixedly connected to the adjusting knob (36), and the adjusting screw rod (34) and the screw rod through hole of the rear fixing member (322) are in a rotatable connection relationship; Two ends of the support column (33) are fixedly connected to the front fixing member (321) and the rear fixing member (322); The adjusting knob (36) rotates under the action of an external force, and the adjusting screw rod (34) drives the displacement slider (35) as well as the inner shell (2) and the clamping back plate (4) to move back and forth in the front-back direction, thereby achieving fine adjustment of the distance between the partial discharge sensor probe and the device under test. In addition, during the adjustment process, the actual distance between the partial discharge sensor probe and the bottom plane is determined using the distance observation window (12) and the reference line structure (22).

[0009] A pair of U-shaped grooves are formed at the end of the bottom plate (41) for clamping the back plate (4), and a guide groove is formed at the bottom of the U-shaped groove along a direction perpendicular to the side baffle (42); The clamping buckle (43) is composed of two L-shaped rods and a pull rod arranged in parallel, the end of the cross rod of the L-shaped rod is fixedly connected to the bottom of the guide groove, the cross rod of the L-shaped rod is provided with an elastic mechanism, the two ends of the pull rod are fixedly connected to the end of the vertical rod of the L-shaped rod, and the surface of the pull rod has a protective layer structure; The clamping buckle (43) moves in the direction of the cross bar of the L-shaped rod away from the side baffle (42) under the action of external force. After the probe is installed on the bottom plate (41), the elastic mechanism causes the clamping buckle (43) to rebound under force, thereby clamping and fixing the probe.

[0010] Preferably, the partial discharge sensor probe clamping device pulls the partial discharge sensor to perform partial discharge detection so that the partial discharge sensor probe is kept parallel to the surface of the shell of the device under test and the distance therebetween remains unchanged.

[0011] Preferably, the displacement platform (3) is made of alloy material; the protective layer structure on the surface of the pull rod is a plastic protective layer; The elastic mechanism of the clamping buckle (43) is located at the end of the cross bar of the L-shaped rod and is a spring, and the two ends of the spring are connected to the bottom of the guide groove and the end of the rod; or, the elastic mechanism of the clamping buckle (43) is located in the middle of the cross bar of the L-shaped rod, and a spring is used to connect the two ends of the cross bar.

[0012] Preferably, the insulating operating rod is an electrician's link rod.

[0013] Preferably, the outer shell (1), the inner shell (2), the displacement platform (3), the clamping back plate (4), and the operating assembly are manufactured by 3D printing.

[0014] The present invention provides a partial discharge detector for detecting the position of partial discharge on the surface of a device under test, comprising a partial discharge sensor and the aforementioned adjustable-distance partial discharge sensor probe clamping device.

[0015] It can be seen from the above technical scheme that the embodiment of the present invention provides an adjustable distance partial discharge sensor probe clamping device and a partial discharge detector. The device consists of an outer shell, an inner shell, a displacement platform, a clamping back plate, an operating assembly and a universal wheel; the outer surface of the outer shell has a universal wheel fixed support structure extending outward for connecting the universal wheel, a distance observation window is provided on the upper side, and the outer surface of the rear side has a connecting plate structure and an angle limit baffle structure; the operating assembly is movably connected to the connecting plate structure; the displacement platform is installed on the inner surface of the outer shell; the inner shell is fixedly connected to the slider in the displacement platform; the clamping back plate is fixedly connected to the upper side wall of the inner shell, and has a clamping buckle with a spring mechanism; the probe of the partial discharge sensor is fixed under the action of the clamping buckle elastic force. The movable ends of the universal wheel and the contacts on the surface of the shell of the device under test are located in the same plane; the operating assembly drives the device to move smoothly on the surface of the device under test under the action of external force, and the displacement platform can adjust the distance between the probe and the device under test. The device of the present invention fixes and drives the sensor probe to move, so that the angle and distance between the sensor probe and the cabinet are kept fixed during the detection process, and the sensor probe is always parallel to the cabinet surface, which effectively improves the stability of the probe movement and improves the precision and accuracy of the detection results. The operator holds the insulating operating rod to operate, and can perform detection at a safe distance to ensure the safety of operation; during the detection, the sensor probe is kept parallel to the cabinet surface, and the distance from the cabinet surface can be accurately adjusted. The distance is kept unchanged during the detection process, and the sensor probe is smoothly moved up, down, left, and right on the cabinet surface, which is convenient for all-round detection of different parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a partial discharge sensor probe clamping device with adjustable distance.

[0017] Figure 2 This is a schematic diagram of the main components of the overall structure.

[0018] Figure 3 Schematic diagram of the shell structure.

[0019] Figure 4 Schematic diagram of the inner shell structure.

[0020] Figure 5 Schematic diagram of the clamping back plate structure.

[0021] Figure 6 Schematic diagram of the translation stage structure.

[0022] Figure 7 It is a schematic diagram of the rod head connecting part structure.

[0023] Figure 8 Schematic diagram of the connecting shaft structure and dimensions.

[0024] Fig. 9 Provide a schematic diagram with dimensions for the device.

[0025] In the figure: an outer shell (1), an inner shell (2), a displacement platform (3), a clamping back plate (4), an operating assembly, a universal wheel (5), a universal wheel fixing foot structure (11), a distance observation window (12), a connecting plate structure (13), an angle limit baffle structure (14), a knob through hole (15), a wire through opening (16), a wire through hole (21), a reference line structure (22), a back plate (31), a fixing member (32), a front fixing member (321), a rear fixing member (322), a support column (33), an adjustment screw rod (34), a displacement slider (35), an adjustment knob (36), a bottom plate (41), a side baffle (42), a clamping buckle (43), a connecting shaft (61), a rod head connecting member (62), an electrical insulation operating rod (63), a universal wheel mounting nut (7), a sensor probe (8), and a surface of a measured object (9). DETAILED DESCRIPTION

[0026] The technical scheme and technical effects of the present invention are further elaborated in detail below in conjunction with the accompanying drawings of the present invention.

[0027] refer to Figure 1-9 As shown, the present invention provides a partial discharge sensor probe clamping device with adjustable distance, which is used to carry the partial discharge sensor and move on a plane parallel to the surface of the shell of the device under test, so as to achieve a stable limiting effect.

[0028] The device comprises: an outer shell (1), an inner shell (2), a displacement platform (3), a clamping back plate (4), an operating component and a group of universal wheels (5); each structure is reliably bolted and installed.

[0029] The integral shell is mainly responsible for structural support, installation of the translation platform, universal wheels, connecting rods, etc. Figure 3 As shown, the front side of the outer shell (1) is open, the outer surfaces of the left and right side panels have a universal wheel fixing foot structure (11) extending outward, the upper side panel is provided with a distance observation window (12), and the outer surface of the rear side panel is provided with a connecting plate structure (13) and an angle limit baffle structure (14); a knob through hole (15) is provided on the rear side panel; the distance observation window (12) of the outer shell (1) is a long strip structure, and the opening direction is parallel to the movement direction of the inner shell (2); the outer edge of the distance observation window (12) has a scale line, and when in use, the actual distance between the probe and the device attachment plane can be observed by observing the corresponding relationship between the scale indicator mark reserved on the inner shell and the scale of the observation window; a wire through opening (16) is provided on the shell body, so that the wire moves with the distance when the inner shell is raised or lowered; refer to Figure 2As shown, a universal wheel fixed foot structure (11) is provided on the upper and lower parts of the outer surface of the left side plate of the housing (1), an M6 through hole is reserved on the universal wheel fixed foot structure (11), and an M4 through hole for installing the displacement stage is reserved on the back. A universal wheel fixed foot structure (11) is provided on the upper and lower parts of the outer surface of the right side plate of the housing (1), and the left and right sides are symmetrically arranged so that the four universal wheels (5) are located parallel to the surface of the shell of the device under test and are evenly distributed. The fixed end of the universal wheel (5) is fixedly connected in the universal wheel fixed foot structure (11), and the contact points of each movable end and the surface of the shell of the device under test are located in the same plane; The connecting plate structure (13) is composed of a pair of connecting plates arranged in parallel, and a connecting shaft mounting hole is provided on the connecting plates; a limiting groove is provided on the rear side plate of the housing (1), and the two connecting plates are located on the upper and lower sides of the limiting groove, and the two angle limiting baffle structures (14) are located on the left and right sides of the limiting groove; The operating assembly is composed of a connecting shaft (61), a rod head connecting piece (62) and an electrically insulating operating rod (63): The rod head connecting piece is mainly responsible for connecting the rod body and the shell. The front end of the rod head connecting piece is movably connected to the connecting disk structure (13) through a connecting shaft, and the rear end is fixedly connected to the electrical insulation operating rod; the front end outer edge of the rod head connecting piece (62) is arc-shaped, the front end structure width matches the width of the limit groove, and the front end of the rod head connecting piece (62) is inserted into the limit groove; the front end of the rod head connecting piece (62) is provided with a connecting shaft through hole, and the connecting shaft (61) is installed in the connecting shaft installation hole of the connecting disk structure (13) and the connecting shaft through hole of the rod head connecting piece (62). The rod head connecting piece (62) and the connecting disk structure (13) are both rotatably connected with the connecting shaft (61) to realize the single-plane rotation of the rod shaft around the axis. The surface of the rod head connecting piece (62) and the inner surface of the connecting disk structure (13) are in contact and are in a sliding connection relationship. The connecting disk structure (13) is used to limit the rod head connecting piece (62) to prevent it from sliding up and down during the left and right rotation process; the structure and size of the connecting shaft (61) are as shown in FIG. Figure 8 As shown, when in use, the shaft connection is directly penetrated, and the top opening can be fixed with an electrical cable tie, which is convenient for installation and disassembly; The angle limiting baffle structure (14) is used to limit the rotation range of the rod head connecting member. Figure 2 As shown, a triangular structure can be used, with the plane where the shell surface of the device under test is located as the reference, and the angle of the limit baffle structure (14) on both sides is 30°, so as to limit the rotation angle of the rod head connecting member (62) to 30°~150°, so as to prevent the moment parallel to the surface under test from being too long due to the angle being too small, and avoid the shell flipping when pushing; The rear end of the rod head connector (62) is axially provided with an installation groove, and the electrical insulating operating rod (63) is inserted into the installation groove. The electrical insulating operating rod (63) and the rod head connector (62) are fixedly connected by bolts (M4 bolts are common); the insulating operating rod adopts an electrician's linchpin, which is an insulating tool used for operating live equipment for a short time. In actual application, different specifications of linchpins can be replaced according to different needs, and different specifications correspond to different insulation levels. The rod head connector is installed on the top to facilitate connection with the shell.

[0030] The inner shell (2) is mainly responsible for the fixed connection with the slider of the translation stage and the fixed connection with the mounting back plate. The structural schematic diagram thereof is shown in FIG. Figure 4 As shown: the front side of the inner shell (2) is open, a wire through hole (21) is provided on the left side wall, and the outer surface of the upper side plate has a reference line structure (22); the shell scale indicator mark is used to compare the distance of the probe from the outer shell to the observation window, and the side is reserved for the wire through hole (21) to facilitate the wire entry and exit of the sensor.

[0031] The displacement stage is made of alloy material, mainly including two fixed ends and two supporting columns. There are bearings and adjustment screws in the middle of the two fixed ends. By adjusting the top adjustment knob and rotating the adjustment screw, the relative movement of the displacement slider can be achieved to complete the precise adjustment of the distance. The structure is referenced Figure 6 As shown in the figure: the displacement platform (3) comprises a back plate (31), two fixing members (32), two supporting columns (33), an adjusting screw rod (34), a displacement slider (35), and an adjusting knob (36); the outer surface of the back plate (31) is fixedly mounted on the inner surface of the right side wall of the housing (1); the two fixing members (32) are fixedly mounted on the inner surface of the back plate (31) and are located at the front and rear ends of the back plate (31); the displacement slider (35) is placed between the front fixing member (321) and the rear fixing member (322); two supporting column through holes and one screw rod through hole are provided on the displacement slider (35); the screw rod through hole is located between the two supporting column through holes, and the displacement slider (35) is provided with a screw rod through hole. The block (35) and the adjusting screw rod (34) are in a threaded connection relationship; the supporting column through hole is provided with a supporting column (33); the displacement slider (35) and the supporting column (33) are in a sliding connection relationship; one end of the adjusting screw rod (34) is rotatably connected to the screw rod placement groove of the front fixing member (321), and the other end passes through the displacement slider (35) and the rear fixing member (322) in sequence and is fixedly connected to the adjusting knob (36); the adjusting screw rod (34) and the screw rod through hole of the rear fixing member (322) are in a rotatable connection relationship; the two ends of the supporting column (33) are fixedly connected to the front fixing member (321) and the rear fixing member (322); The displacement stage (3) is mounted on the inner surface of the right side plate of the outer shell (1). During installation, the displacement stage is mounted inside the outer shell of the device through the fixed ends at both ends. The right side plate of the inner shell (2) is fixedly connected to the slider in the displacement stage (3). The adjustment knob of the displacement stage (3) extends from the knob through hole (15) to the outside of the outer shell (1). The inner shell (2) reciprocates in a direction perpendicular to the shell surface of the device under test.

[0032] The adjusting knob (36) rotates under the action of external force, and the adjusting screw (34) drives the displacement slider (35) and the inner shell (2) and the clamping back plate (4) to move back and forth in the front-back direction, so as to achieve fine adjustment of the distance between the partial discharge sensor probe and the device under test, and during the adjustment process, the actual distance between the partial discharge sensor probe and the bottom plane is determined by using the distance observation window (12) and the reference line structure (22). (The bottom plane refers to the shell surface of the device under test) The schematic diagram of the clamping back plate structure is as follows Figure 5 As shown, the clamping back plate (4) is an L-shaped plate composed of a bottom plate (41) and a side baffle (42), wherein the outer wall of the bottom plate (41) is fixedly connected to the inner surface of the upper side wall of the inner shell (2), the clamping back plate is bolted to the inner shell by screws, and a clamping buckle (43) with a spring mechanism is installed on the bottom plate (41); under the elastic force of the clamping buckle (43), the clamping buckle (43) and the side baffle (42) jointly clamp the probe of the partial discharge sensor; the output wire of the partial discharge sensor passes through the wire through hole (21).

[0033] A pair of U-shaped grooves are provided at the end of the bottom plate (41) of the clamping back plate (4), and a guide groove is provided at the bottom of the U-shaped groove in a direction perpendicular to the side baffle (42); the clamping buckle (43) is composed of two L-shaped rods and a pull rod arranged in parallel, the end of the cross bar of the L-shaped rod is fixedly connected to the bottom of the guide groove, the cross bar of the L-shaped rod has an elastic mechanism, the two ends of the pull rod are fixedly connected to the end of the vertical rod of the L-shaped rod, and the surface of the pull rod has a protective layer structure; the clamping buckle (43) moves away from the side baffle (42) along the direction of the cross bar of the L-shaped rod under the action of an external force, and after the probe is installed on the bottom plate (41), the elastic mechanism causes the clamping buckle (43) to rebound under force, thereby clamping and fixing the probe. When installing the probe, it is only necessary to move the buckle to one side, put in the probe, and after releasing the buckle, the spring will pull the buckle back to its original position, thereby clamping and fixing the probe.

[0034] The elastic mechanism of the clamping buckle (43) is located at the end of the cross bar of the L-shaped rod and is a spring, and the two ends of the spring are connected to the bottom of the guide groove and the end of the rod; or, the elastic mechanism of the clamping buckle (43) is located in the middle of the cross bar of the L-shaped rod, and the two ends of the cross bar are connected by a spring.

[0035] In order to protect the sensor probe, the protective layer structure on the surface of the pull rod is a plastic protective layer; to prevent the probe from being scratched during the clamping process, the side baffle is mainly used to limit the probe to the central area of ​​the inner shell. After the probe is placed, its level will be located near the center of the entire device, which is convenient for detection. There are many grooves on the back of the installation backplane, which is mainly used to reduce the actual material volume of the backplane to reduce the overall weight of the device.

[0036] For sensor probes of different sizes, clamping can be achieved by changing the clamping back plate and the clamping buckle size, or adding a pad.

[0037] The partial discharge sensor probe clamping device pulls the partial discharge sensor to perform partial discharge detection, so that the partial discharge sensor probe is kept parallel to the surface of the shell of the device under test and the distance remains unchanged. Assuming that the overall height of the device from the bottom of the universal wheel to the axis of the connecting shaft is H, the fixed axis spacing of the universal wheel is L, and the minimum value of the limiting angle between the limit baffle and the rod head connecting member (62) is A, the three should satisfy the relationship: H / sI < L / 2 It can be seen from the formula that there are two ways to prevent flipping, one is to increase the limit angle, and the other is to reduce the overall height of the device to make the device more "flat". Similarly, the invention opens a hole in the shell and makes the shell connection plate sinking, which is also for the purpose of reducing the height.

[0038] The main functions that can be achieved by the device of the present invention are: Probe clamping: When in use, place the ultrasonic partial discharge detector probe (hereinafter referred to as the probe) into the inner shell and fix it using the clamping buckle on the clamping back plate. The inner and outer shells have reserved openings for passing the probe wire.

[0039] Distance adjustment: By adjusting the height knob, the displacement slider of the translation stage can be moved to move the inner shell up and down relative to the outer shell, thereby adjusting the height of the probe from the bottom plane, and the actual distance between the current probe and the bottom plane can be observed through the height observation window on the side of the shell.

[0040] Rod shaft reversing: The operating rod can be connected to the outer shell connection plate using the rod head connector and the connecting shaft. When the bottom of the outer shell is attached to the plane to be inspected, the push rod head can rotate forward and backward (up and down) in a single plane relative to the outer shell to smoothly achieve different angles required at different heights. The left and right rotation is limited to ensure that there will be no angle deflection when pushing the device. The left and right translation can directly push the rod body left and right, and the reversing is achieved through the universal wheel at the bottom.

[0041] Furthermore, the present invention provides a partial discharge detector for detecting the position of partial discharge on the surface of a device under test, comprising a partial discharge sensor and the aforementioned adjustable distance partial discharge sensor probe clamping device. Figure 1 In the structure shown, the probe of the partial discharge sensor is fixed on the clamping back plate (4), and the circuit of the partial discharge sensor passes through the side.

[0042] The partial discharge detector of the present invention has the following characteristics: 1. Use the solution of inner shell clamping and outer shell support to fix the sensor probe on an adjustable plane. Compare the inner and outer shell markings to complete the plane distance observation and adjustment. During the detection process, the probe and the surface of the cabinet to be tested can be kept parallel and at a fixed distance. The distance can be adjusted in advance to improve the measurement accuracy and stability.

[0043] 2. Through the up and down rotation of the shell connection plate and the direction-changing function of the universal wheel, the device can achieve multi-directional smooth movement on the vertical plane and detect different positions and heights.

[0044] 3. Through the left and right limit of the shell connection plate, the angle limit baffle limits the angle between the rod body and the device, the height of the connecting shaft through hole, and the length of the universal wheel support foot, the stability of the device when it is attached to the vertical surface is maintained, preventing it from rotating freely and flipping under the influence of gravity, and losing stability and being unable to fit reliably.

[0045] 4. The main parts such as the inner shell, outer shell, clamping back plate, etc. can be made in an integrated manner by 3D printing, which is light and easy to assemble.

[0046] 5. The back of the housing is connected to the rod head without a universal shaft, but a connecting plate structure (13) is designed to be integrated with the housing. The connecting plate has a limiting function for the device body to ensure that the direction and angle of the device must be controlled by the force of the handheld rod during movement.

[0047] 6. To prevent overturning, firstly, limit baffles are designed on the upper and lower sides of the connection plate, which can limit the minimum angle between the rod and the bottom surface of the device during the up and down adjustment process. Secondly, by extending the length of the universal wheel support foot, it is ensured that when the rod is pushed, its torque acts within the upper and lower intervals of the device support foot, rather than outside. The thrust of the rod always becomes the force that presses the device onto the surface of the cabinet to be tested, so as to prevent the device from overturning.

[0048] The present invention provides a partial discharge detector for detecting the position of partial discharge on the surface of the equipment under test, including a partial discharge sensor and the aforementioned adjustable partial discharge sensor probe clamping device. The partial discharge detector can keep the sensor probe at a fixed angle and distance with the cabinet during the detection process, and always be parallel to the cabinet surface, thereby improving the stability of the probe movement and the precision and accuracy of the detection results. The operator performs detection through an insulating operating rod, and can perform detection at a safe distance to ensure operational safety. During detection, the sensor probe is kept parallel to the cabinet surface, and the distance from the cabinet surface can be accurately adjusted. The distance is kept unchanged during the detection process, and the sensor probe is smoothly moved up, down, left, and right on the cabinet surface, which is convenient for all-round detection of different parts.

[0049] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A partial discharge sensor probe clamping device with adjustable distance, characterized in that: Used to carry a partial discharge sensor and move it on a plane parallel to the surface of the shell of the device under test, the device comprises: an outer shell (1), an inner shell (2), a displacement platform (3), a clamping back plate (4), an operating assembly and a set of universal wheels (5); The front side of the housing (1) is open, the outer surfaces of the left and right side panels are provided with universal wheel fixing support legs (11) extending outward, the upper side panel is provided with a distance observation window (12), the outer surface of the rear side panel is provided with a connecting plate structure (13) and an angle limiting baffle structure (14); the rear side panel is provided with a knob through hole (15); and the outer edge of the distance observation window (12) is provided with a scale line; The fixed end of the universal wheel (5) is fixedly connected in the universal wheel fixed support foot structure (11), and each movable end and the contact point on the surface of the housing of the device under test are located in the same plane; The operating assembly is composed of a connecting shaft (61), a rod head connecting piece (62) and an electrically insulating operating rod (63); the front end of the rod head connecting piece is movably connected to the connecting plate structure (13) through the connecting shaft, and the rear end is fixedly connected to the electrically insulating operating rod; the angle limiting baffle structure (14) is used to limit the rotation range of the rod head connecting piece; The displacement stage (3) is mounted on the inner surface of the right side plate of the outer shell (1); the right side plate of the inner shell (2) is fixedly connected to a slider in the displacement stage (3); an adjustment knob of the displacement stage (3) extends from a knob through hole (15) to the outside of the outer shell (1); and the inner shell (2) reciprocates in a direction perpendicular to the surface of the shell of the device under test; The front side of the inner shell (2) is open, a wire through hole (21) is provided on the left side wall, and the outer surface of the upper side plate has a reference line structure (22); The clamping back plate (4) is an L-shaped plate composed of a bottom plate (41) and a side baffle (42), wherein the outer wall of the bottom plate (41) is fixedly connected to the inner surface of the upper side wall of the inner shell (2), and a clamping buckle (43) with a spring mechanism is installed on the bottom plate (41); under the elastic force of the clamping buckle (43), the clamping buckle (43) and the side baffle (42) jointly clamp the probe of the partial discharge sensor; and the output wire of the partial discharge sensor passes through the wire through hole (21).

2. The adjustable distance partial discharge sensor probe clamping device according to claim 1, characterized in that: The distance observation window (12) of the outer shell (1) is a long strip structure, and its opening direction is parallel to the movement direction of the inner shell (2); The connecting disk structure (13) is composed of a pair of connecting disks arranged in parallel, and a connecting shaft mounting hole is provided on the connecting disks; a limiting groove is provided on the rear side plate of the housing (1), and the two connecting disks are located on the upper and lower sides of the limiting groove, and two angle limiting baffle structures (14) are located on the left and right sides of the limiting groove; In the operating assembly, the front end outer edge of the rod head connecting member (62) is arc-shaped, the front end structural width matches the width of the limiting groove, and the front end of the rod head connecting member (62) is inserted into the limiting groove; the front end of the rod head connecting member (62) is provided with a connecting shaft through hole, the connecting shaft (61) is installed in the connecting shaft installation hole of the connecting disk structure (13) and the connecting shaft through hole of the rod head connecting member (62), and the rod head connecting member (62) and the connecting disk structure (13) are both rotatably connected to the connecting shaft (61); when the rod head connecting member (62) rotates left and right, the angle limiting baffle structures (14) located on the left and right sides limit the rotation angle of the rod head connecting member (62); A mounting groove is axially provided at the rear end of the rod head connecting piece (62), and the electrical insulating operating rod (63) is inserted into the mounting groove. The electrical insulating operating rod (63) and the rod head connecting piece (62) are fixedly connected by bolts; A universal wheel fixing foot structure (11) is respectively arranged on the upper and lower parts of the outer surface of the left side plate of the housing (1), and a universal wheel fixing foot structure (11) is respectively arranged on the upper and lower parts of the outer surface of the right side plate of the housing (1), and the left and right sides are symmetrically arranged so that the four universal wheels (5) are located together and parallel to the shell surface of the device under test and are evenly distributed.

3. The adjustable distance partial discharge sensor probe clamping device according to claim 2, characterized in that: Taking the plane where the housing surface of the device under test is located as a reference, the rotation angle of the rod head connecting member (62) is 30° to 150°; Assuming that the overall height of the device from the bottom of the universal wheel to the axis of the connecting shaft is H, the fixed axis spacing of the universal wheel is L, and the minimum value of the limiting angle between the limit baffle and the rod head connecting member (62) is A, then: H / sina ＜ L / 2。 4. The adjustable distance partial discharge sensor probe clamping device according to claim 3, characterized in that: The displacement platform (3) comprises a back plate (31), two fixing members (32), two supporting columns (33), an adjusting screw rod (34), a displacement slider (35), and an adjusting knob (36), wherein: The outer surface of the back plate (31) is fixedly mounted on the inner surface of the right side wall of the housing (1); two fixing members (32) are fixedly mounted on the inner surface of the back plate (31) and are located at the front and rear ends of the back plate (31); The displacement slider (35) is placed between the front fixing member (321) and the rear fixing member (322); two support column through holes and one screw rod through hole are provided on the displacement slider (35); the screw rod through hole is located between the two support column through holes, and the displacement slider (35) and the adjusting screw rod (34) are in a threaded connection relationship; a support column (33) is inserted into the support column through hole, and the displacement slider (35) and the support column (33) are in a sliding connection relationship; One end of the adjusting screw rod (34) is rotatably connected to the screw rod placement groove of the front fixing member (321), and the other end passes through the displacement slider (35) and the rear fixing member (322) in sequence and is fixedly connected to the adjusting knob (36), and the adjusting screw rod (34) and the screw rod through hole of the rear fixing member (322) are in a rotatable connection relationship; Two ends of the support column (33) are fixedly connected to the front fixing member (321) and the rear fixing member (322); The adjusting knob (36) rotates under the action of an external force, and the adjusting screw rod (34) drives the displacement slider (35) as well as the inner shell (2) and the clamping back plate (4) to move back and forth in the front-back direction, thereby achieving fine adjustment of the distance between the partial discharge sensor probe and the device under test. In addition, during the adjustment process, the actual distance between the partial discharge sensor probe and the bottom plane is determined using the distance observation window (12) and the reference line structure (22).

5. The adjustable distance partial discharge sensor probe clamping device according to claim 4, characterized in that: A pair of U-shaped grooves are formed at the end of the bottom plate (41) for clamping the back plate (4), and a guide groove is formed at the bottom of the U-shaped groove along a direction perpendicular to the side baffle (42); The clamping buckle (43) is composed of two L-shaped rods and a pull rod arranged in parallel, the end of the cross rod of the L-shaped rod is fixedly connected to the bottom of the guide groove, the cross rod of the L-shaped rod is provided with an elastic mechanism, the two ends of the pull rod are fixedly connected to the end of the vertical rod of the L-shaped rod, and the surface of the pull rod has a protective layer structure; The clamping buckle (43) moves in the direction of the cross bar of the L-shaped rod away from the side baffle (42) under the action of external force. After the probe is installed on the bottom plate (41), the elastic mechanism causes the clamping buckle (43) to rebound under force, thereby clamping and fixing the probe.

6. The adjustable distance partial discharge sensor probe clamping device according to claim 5, characterized in that: The partial discharge sensor probe clamping device pulls the partial discharge sensor to perform partial discharge detection, so that the partial discharge sensor probe is kept parallel to the surface of the shell of the device under test and the distance between them remains unchanged.

7. The adjustable distance partial discharge sensor probe clamping device according to claim 6, characterized in that: The displacement platform (3) is made of alloy material; the protective layer structure on the surface of the pull rod is a plastic protective layer; The elastic mechanism of the clamping buckle (43) is located at the end of the cross bar of the L-shaped rod and is a spring, and the two ends of the spring are connected to the bottom of the guide groove and the end of the rod; or, the elastic mechanism of the clamping buckle (43) is located in the middle of the cross bar of the L-shaped rod, and a spring is used to connect the two ends of the cross bar.

8. The adjustable distance partial discharge sensor probe clamping device according to claim 7, characterized in that: The insulating operating rod adopts an electrician's ring rod.

9. The adjustable distance partial discharge sensor probe clamping device according to claim 8, characterized in that: The outer shell (1), the inner shell (2), the displacement platform (3), the clamping back plate (4), and the operating components are manufactured by 3D printing.

10. A partial discharge detector, characterized in that: Used for detecting the position of partial discharge on the surface of a device under test, comprising a partial discharge sensor and the partial discharge sensor probe clamping device with adjustable distance as claimed in any one of claims 1 to 9.

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