A measuring brush holder structure for generator shaft voltage monitoring

Abstract

The utility model relates to a kind of measurement brush holder structures for generator shaft voltage monitoring, belong to the technical field of power generation equipment condition monitoring, to solve the problem of existing measurement brush holder height adjustment inconvenience, installation complex and difficult to ensure copper braid and stable reliable contact with rotating shaft.This structure includes the insulating baffle fixed on the generator end cover, its outside is equipped with T type vertical slide rail;Measurement brush holder contains adjustable support with T type vertical sliding slot, sliding slot and slide rail sliding fit realize the vertical sliding adjustment of support;Screw hole is opened on support and is screwed into locking screw, screw end portion can be tightly closed insulating baffle to fix support height;Clamping member fixed on support clamps copper braid, gap is equipped between clamping member and rotating shaft surface, and the sagging section outside copper braid is naturally sagging by gravity and overlaps rotating shaft surface to collect shaft voltage signal to be clamped.This structure is mainly used for conveniently and reliably collecting shaft voltage signal of generator rotating shaft 11 to monitor.

Description

Technical Field

[0001] This utility model relates to the field of power generation equipment condition monitoring technology, and in particular to a measuring brush holder structure for generator shaft voltage monitoring. Background Technology

[0002] In the field of generator operation status monitoring, accurate measurement of shaft voltage is crucial for preventing bearing galvanic corrosion and ensuring equipment safety. However, the following technical challenges exist in the installation and use of the measuring brush holder: First, brush holder height adjustment is inconvenient. The relative position of the generator shaft and end cover varies depending on the equipment model or installation tolerances, requiring the copper braid clamping position of the brush holder to be vertically adjustable. Existing structures often use fixing bolt holes drilled in the insulating base to install the brush holder, and adjustment relies on stacking shims or re-drilling holes. This adjustment method is cumbersome, requiring repeated bolt removal and removal, and it is difficult to accurately control the adjustment amount within the narrow space of the generator end cover. More importantly, the reliability of the tightening after adjustment is easily affected by human factors, posing a risk of loosening. Therefore, it is crucial that the brush holder can quickly adapt to different installation heights and ensure that the drooping section of the copper braid maintains the optimal contact distance with the shaft surface.

[0003] Secondly, the downward posture of the copper braid lacks effective control. The copper braid's natural downward descent, relying on gravity to connect with the rotating shaft, is determined by its working principle. However, its flexible nature makes the downward section susceptible to interference from factors such as airflow from the rotating shaft and equipment vibration, potentially leading to excessive upward movement, lateral deviation, or insufficient contact with the shaft. Existing designs typically rely solely on clamping points to fix the upper end of the copper braid, lacking any guiding or restraining devices for the downward section. When the copper braid rises, it can cause poor contact with the shaft or even complete detachment, interrupting signal acquisition; lateral deviation can cause the copper braid to accidentally collide with adjacent components (such as bearing housings), posing a risk of short circuits or wear. The lack of active restraint on the downward posture of the copper braid is a major bottleneck affecting measurement stability and long-term reliability.

[0004] Third, the copper braid is prone to circumferential oscillation. When the generator shaft rotates at high speed, the oil film adhering to its surface, minute vibrations, and air eddies act on the naturally drooping copper braid. The copper braid, composed of multiple strands of fine copper wire, has considerable flexibility and freedom, making it highly susceptible to uncontrolled left-right oscillation in the circumferential direction (i.e., the direction around the shaft). This oscillation exacerbates the uncertainty of the contact point between the copper braid and the shaft, leading to fluctuations or distortions in the acquired shaft voltage signal. Furthermore, continuous oscillation accelerates fatigue wear at the ends of the copper braid, shortening its service life. Existing structures generally lack measures to suppress circumferential oscillation, making it difficult to guarantee the accuracy of measurement results and the long-term reliability of the equipment. Utility Model Content

[0005] This utility model addresses the following problems: Traditional generator shaft voltage measurement brush holders suffer from difficulties in height adjustment. Installation requires repeated bolt removal and shim adjustments to accommodate the shaft position, making the process cumbersome and difficult to control precisely in confined spaces. Furthermore, the copper braid, hanging solely under gravity, is susceptible to airflow vibrations, leading to poor contact or misalignment, thus affecting signal acquisition stability. Existing structures cannot simultaneously meet the requirements of convenient adjustment and reliable contact.

[0006] This addresses the issue of uncontrolled drooping of copper braids. Unrestrained copper braids are prone to rising and detaching from the pivot or veering to the side and touching other components, causing signal interruption or short circuit risks. Traditional designs lack active guidance devices, making it difficult to maintain the copper braid's flat position without affecting its natural overlap, leading to decreased measurement reliability.

[0007] Further solutions are needed to address the circumferential oscillation problem of the copper braid. During shaft rotation, oil film and airflow induce left-right oscillation of the copper braid, leading to contact point fluctuations, signal distortion, and accelerated wear. Conventional structures lack specific limiting measures, making it difficult to suppress oscillation and affecting measurement accuracy and the lifespan of the copper braid.

[0008] To address the risk of uncontrolled travel of the limit block. During adjustment, the insulating block may extend excessively or detach from the channel, leading to failure of the limit function or damage to components. Existing sliding structures lack a travel constraint mechanism, resulting in uncertainties in installation and maintenance.

[0009] Optimize the copper braid clamping method. Traditional fixing structures (such as welding or bolt crimping) are not convenient for replacing copper braids, and the clamping force is not easy to control evenly, which may damage the copper wire or increase the contact resistance, affecting the signal transmission efficiency.

[0010] Improve the reliability of the contact between the copper braid and the shaft. Single-point contact is susceptible to signal interruption due to surface oil or localized oxidation; traditional integral copper braids cannot disperse contact risks and are difficult to adapt to the microscopic unevenness of the shaft surface.

[0011] Solve the problem of connection efficiency at the signal output end. Traditional wiring requires tools to tighten or solder, which is cumbersome to disassemble and easily damages the interface. It is not conducive to frequent measurement or maintenance and increases downtime costs.

[0012] To achieve the above objectives, this utility model provides a measuring brush holder structure for generator shaft voltage monitoring, comprising: An insulating baffle is fixedly installed on the generator end cover by support bolts, and a T-shaped vertical slide rail is provided on the outer side of the insulating baffle; Measuring brush holder, which includes: The adjustable bracket has a T-shaped vertical slide groove (6) adapted to the T-shaped vertical slide rail on the side facing the insulating baffle. The T-shaped vertical slide groove slides in conjunction with the T-shaped vertical slide rail to realize the sliding adjustment of the adjustable bracket in the vertical direction. The adjustable bracket has a screw hole that passes through its body. The locking screw is screwed into the screw hole, and the end of the locking screw can press against the insulating baffle, thereby fixing the adjustable bracket at a set height position. A clamping element, which is fixed to the adjustable bracket; The copper braid is clamped and fixed by a clamping component and has a hanging section. A gap of 1-5mm is provided between the clamping component and the surface of the generator shaft. The hanging section of the copper braid, excluding the clamped section, hangs down naturally under its own weight and overlaps the surface of the generator shaft to collect the generator shaft voltage signal.

[0013] Preferably, it also includes an adjustable limit block; the adjustable limit block includes: An insulating block, the bottom surface of which is a smooth insulating plane or arc surface; Adjusting screw; The adjustable bracket has a channel fixedly installed on its side. The channel is composed of a top plate and two side plates. The top is closed and the bottom forms a slot facing the generator shaft. The insulating block is slidably fitted into the channel, and its two sides are in sliding contact with the side plate. A through threaded hole is provided on the top plate, and a threaded hole is provided at the corresponding position on the top of the insulating block; the adjusting screw is screwed into the through threaded hole and the threaded hole in sequence, and the insulating block is driven to move away from or closer to the generator shaft along the channel by rotating the adjusting screw; The bottom surface of the insulating block is suspended above the drooping section of the copper braid; by adjusting the position of the insulating block, a gap or contact is maintained between its bottom surface and the copper braid, thus restricting the copper braid to a flat state and naturally overlapping the surface of the generator shaft.

[0014] Preferably, the bottom surface of the insulating block is an arc surface, and the distance between the arc surface and the surface of the generator shaft gradually decreases, so that the copper braid gradually approaches the surface of the shaft under the action of gravity. Furthermore, the middle area of ​​the arc surface forms a concave structure, which restricts the drooping section of the copper braid inside, preventing the copper braid from swinging left and right in the circumferential direction of the rotating shaft.

[0015] Preferably, a limit post is fixedly installed on the inner side of the channel; An insulating block has a through-hole limiting groove, the length of which is parallel to the opening of the groove. When the insulating block is fitted into the channel, the limiting post penetrates the limiting groove, and the outer wall of the limiting post slides into the inner wall of the limiting groove; when the insulating block slides along the channel, its movement is constrained within the length range of the limiting groove, and the maximum movement is equal to the length of the limiting groove.

[0016] Preferably, the clamping element is a clamping plate; the side of the adjustable bracket is provided with an installation plane; the clamping plate is passed through its body by at least one screw and screwed into the threaded hole of the installation plane; a copper braid clamping space (23) is formed between the clamping plate and the installation plane; the end of the copper braid passes through the copper braid clamping space; by turning the screw, the clamping plate is driven to move towards the installation plane, thereby pressing and fixing the copper braid.

[0017] Preferably, the copper braid is composed of multiple strands of forked silver-plated copper wire; the end of the drooping section that naturally overlaps the surface of the generator shaft is fan-shaped, and the contact points between the end of each fork and the surface of the generator shaft are distributed along the shaft axis.

[0018] Preferably, the lead-out end of the copper braid is fixedly connected to a quick-release interface; the quick-release interface is quickly plugged into and unplugged from an external measuring cable to transmit the acquired shaft voltage signal to the monitoring equipment.

[0019] This utility model has at least the following beneficial effects: 1. Stepless height adjustment is achieved through the cooperation of T-shaped slide rails and slide grooves. The bracket can be slidable by loosening the locking screw with one hand, significantly simplifying the installation process. The locking screw directly presses against the insulating baffle, providing a stable mechanical lock and avoiding the loosening risk of traditional shim adjustments. The gap design ensures that the copper braid naturally overlaps the shaft by gravity alone, eliminating frictional losses caused by mechanical pressure, while preventing detachment caused by airflow disturbances, ensuring continuous signal acquisition. The overall structure is compact and adaptable to the narrow space of the generator end cover.

[0020] 2. The adjustable limit block achieves precise position control via a screw drive, allowing its bottom surface to be precisely suspended above the copper braid. By adjusting the distance between the bottom surface and the copper braid, or even just making slight contact, it effectively prevents the copper braid from tilting upwards or sideways, forcibly maintaining a flat position without hindering gravity's downward descent. The channel structure provides stable sliding guidance, ensuring the limit block is always on the correct working plane. This design fundamentally solves the contact problem caused by copper braid instability, improving measurement reliability.

[0021] 3. The curved surface design guides the copper braid to smoothly transition to the shaft surface, avoiding localized bending. The concave structure forms a circumferential physical barrier, confining the copper braid within a predetermined width range and completely eliminating lateral swaying induced by high-speed rotation. The copper braid maintains axial freedom within the confined space, ensuring full contact between the bifurcation ends and the shaft. This dual design significantly reduces signal fluctuations and copper braid wear, extending component lifespan.

[0022] 4. The sliding fit between the limiting post and the limiting groove creates a rigid travel constraint, completely eliminating the risk of the insulating block coming out of the groove or overextending. The length of the limiting groove is precisely controlled within the maximum adjustment range, avoiding structural interference caused by misoperation. The sliding process is smooth and without jamming, significantly improving maintenance safety.

[0023] 5. The clamping space formed by the clamping plate and the mounting surface, combined with the screw tightening mechanism, ensures uniform force distribution and fixation at the end of the copper braid. The clamping force can be precisely controlled by the screw insertion depth to avoid damaging the copper wire. Disassembly only requires loosening the screws to replace the copper braid, significantly improving maintenance convenience.

[0024] 6. Multi-strand, forked, silver-plated copper wire provides redundant contact paths; damage to a single strand does not affect overall functionality. The fan-shaped, spreading ends distribute contact points axially, effectively avoiding contact failures caused by local defects or oil film on the shaft. The silver plating reduces contact resistance and improves signal sensitivity. The axially distributed contact points more accurately reflect the shaft voltage gradient.

[0025] 7. The quick-release interface allows for manual insertion and removal of measurement cables without tools, significantly reducing equipment connection time. The standardized interface is compatible with various monitoring instruments, enhancing system flexibility. A reliable mechanical locking structure ensures stable connection under vibration conditions, preventing signal interruptions. This design is particularly suitable for frequent testing scenarios, reducing unit downtime.

[0026] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the installation position of the measuring brush holder structure for monitoring generator shaft voltage according to this utility model; Figure 2 This is a front view of the measuring brush holder structure for generator shaft voltage monitoring described in this utility model. Figure 3 This is a schematic diagram of the adjustable bracket described in this utility model; Figure 4 This is a schematic diagram of the adjustable limiting block described in this utility model; Figure 5 This is a schematic diagram of the disassembled structure of the adjustable limiting block described in this utility model; Figure 6 This is a schematic diagram of the structure of the insulating block described in this utility model.

[0028] The components include: generator end cover 10, generator shaft 101, insulating baffle 20, mounting plane 22, clamping space 23, quick-release interface 24, T-shaped vertical slide rail 201, support bolt 202, measuring brush holder 3, adjustable bracket 30, middle plate 301, side plate 302, T-shaped vertical slide groove 303, locking screw 31, clamping piece 32, gap space 320, copper braid 33, adjustable limit block 34, channel 35, top plate 351, through threaded hole 3510, side plate 352, slot 353, limit post 354, adjusting screw 355, insulating block 356, arc surface 357, threaded hole 358, limit groove 359, and concave structure 3571. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0030] As shown in Figures 1-6, a measuring brush holder structure for generator shaft voltage monitoring includes an insulating baffle 20 and a measuring brush holder 3. The measuring brush holder 3 includes an adjustable bracket 30, a locking screw 31, a clamping member 32, and a copper braid 33.

[0031] The insulating baffle 20 can be made of 12mm thick epoxy resin board, preferably semi-circular in shape, with a Φ10.5mm through hole for inserting M10 support bolts 202, the support bolts 202 being 40mm long. A 20mm wide and 8mm deep T-shaped vertical slide rail 201 is fixed to the outer side of the insulating baffle 20, the centerline of which points parallel to the generator shaft 101. The adjustable bracket 30 can be made of aluminum alloy or steel, and a 20.2mm wide and 10mm deep T-shaped vertical groove 303 is fixed to its side facing the insulating baffle 20. The T-shaped vertical groove 303 and the T-shaped vertical slide rail 201 are clearance-fitted, with a clearance of 0.05-0.1mm. Preferably, in the illustration, the adjustable bracket 30 includes a middle plate 301 and two side plates 302. A T-shaped vertical slide groove 303 is provided on the middle plate 301, and clamping parts 32 can be installed on the side plates 302 respectively to achieve multi-point measurement. The adjustable bracket 30 has M6 through screw holes, into which M6×25 locking screws 31 are screwed. The ends of the screws 31 can abut against the planes of the baffles 20 on both sides of the slide rail 201. The clamping parts 32 can be selected from L-shaped 304 stainless steel plates or flat plates, and are vertically fixed to the top of the adjustable bracket 30 by two M4 screws. The copper braid 33 can be made of 5mm² cross-section. 2 The 36 strands of tin-plated copper wire, each 180mm in length, are clamped and fixed at their ends by clamping member 32. After installation, the gap between the bottom of clamping member 32 and the surface of rotating shaft 101, 320, is calibrated to approximately 3mm using a feeler gauge, with an actual selectable range of 1-5mm. The drooping section of the copper braid 33 hangs naturally, with its end forming a 20°-25° contact angle with the surface of rotating shaft 101.

[0032] During assembly, attach the insulating baffle 20 to the inspection port of the generator end cover 10, and screw the support bolt 202 through the hole in the baffle 20 into the pre-set threaded hole in the generator end cover 10 for fastening; align the T-shaped vertical slide groove 303 of the adjustable bracket 30 with the T-shaped vertical slide rail 201 and install it from top to bottom, so that the initial position of the adjustable bracket 30 is higher than the center line of the rotating shaft 101; loosen the locking screw 31 and move the adjustable bracket 30 down along the T-shaped vertical slide rail 201 until the drooping section of the copper braid 33 is close to the surface of the rotating shaft 101; use a feeler gauge to measure the gap between the bottom of the clamping part 32 and the rotating shaft 101, and fine-tune the height of the adjustable bracket 30 to make the gap about 3mm, and tighten the locking screw 31 until the insulating baffle 20 is tightly closed; place the upper end of the copper braid 33 into the pressing surface of the clamping part 32, and tighten the clamping screw to complete the fixation.

[0033] During operation, the generator shaft 101 rotates at its rated speed. The drooping section of the copper braid 33 naturally overlaps the surface of the shaft 101 under gravity, slightly undulating with the shaft 101 without losing contact. The shaft voltage signal is transmitted to the lead-out terminal via the copper braid 33, which is then connected to the generator shaft voltage monitoring device. When maintenance, replacement, or adjustment of the measuring position is required, simply loosen the locking screw 31, slide the bracket 30 up and down along the slide rail 201 to the new height, and then tighten it again.

[0034] This implementation scheme achieves rapid and precise adjustment through stepless sliding of the slide rail 201 / slide groove 303 and direct tightening with the screw 31; the 3mm gap ensures pure gravity contact of the copper braid 33, avoiding additional friction and reducing wear. Its height adjustment is convenient and quick, improving contact resistance stability and reducing signal acquisition distortion.

[0035] Furthermore, in another embodiment, an adjustable limiting block 34 is also included, comprising an insulating block 356 and an adjusting screw 355. The insulating block 356 is made of nylon, and taking a size of 40mm (length) × 30mm (width) × 25mm (height) as an example, the bottom surface is machined into an arc surface 357 with an radius of 50mm. The channel 35 is welded from a 3mm thick 304 stainless steel plate or aluminum plate. The top plate 351 is 50mm × 40mm in size, and the side plate 352 is 15mm high. The top plate 351 and the side plate 352 are vertically fixed to the side of the adjustable bracket 30 by welding or screws. In the illustration, the channel 35 is set on the side plate 302 of the adjustable bracket 30, and both the left and right side plates 302 are provided with the channel 35. An M6 through threaded hole 3510 is opened in the center of the top plate 351. An M6 insert is pre-embedded at the center of the top surface of the insulating block 356 to form a threaded hole 358. The adjusting screw 355 is an M6×60 stainless steel screw, which is screwed into the through threaded hole 3510 and the threaded hole 358 in sequence. Preferably, the middle area of ​​the arc surface 357 of the insulating block 356 is provided with a concave structure 3571 with a width of 8mm and a depth of 3mm. Preferably, a limiting post 354 is also provided, which is vertically welded to the side plate 302 of the adjustable bracket 30 and located in the channel 35; the insulating block 356 has a 6.2mm×20mm limiting groove 359, which is clearance-fitted with the limiting post 354.

[0036] During assembly, the channel 35 is fixed to the side plate 302 of the adjustable bracket 30, with the slot opening 353 facing the center line of the rotating shaft 101; the insulating block 356 is inserted into the channel 35 through the slot opening 353, so that the limiting post 354 passes through the limiting groove 359; the adjusting screw 355 is screwed in until it engages with the threaded hole 358. In the initial position, rotating the adjusting screw 355 causes the insulating block 356 to retract to the highest point, where the upper end of the limiting groove 359 contacts the limiting post 354. At this time, the lowest point of the arc surface 357 is 8mm away from the surface of the rotating shaft 101; during adjustment, rotating the adjusting screw 355 clockwise drives the block 356 to move downward, gradually pressing the copper braid 33 flat through the arc surface 357 until the lower edge of the arc surface 357 is about 1-3mm away from the surface of the rotating shaft 101.

[0037] During operation, when the generator is running, the drooping section of the copper braid 33 is confined to the bottom surface of the insulating block 356. The arc surface 357 of the bottom surface guides the copper braid 33 to naturally transition to the surface of the rotating shaft 101, preventing bending. When the copper braid wears and needs compensation, the insulating block is lifted 0.5-1mm by rotating the adjusting screw 355 counterclockwise to restore contact pressure.

[0038] In another embodiment, the bottom surface of the insulating block 356 is an arc surface 357, and the distance between the arc surface 357 and the surface of the generator shaft 101 gradually decreases, so that the copper braid 33 gradually approaches the surface of the shaft under the action of gravity; and the middle area of ​​the arc surface 357 forms a concave structure 3571, which restricts the drooping section of the copper braid 33 inside it, preventing the copper braid 33 from swinging left and right in the circumferential direction of the shaft.

[0039] The distance between the lowest point of the arc surface 357 on the bottom surface of the insulating block 356 and the surface of the rotating shaft 101 is set to 1-3 mm. A concave arc structure 3571, 10 mm wide and 2.5 mm deep, is milled into the middle area of ​​the arc surface 357. The distance between the two side walls of the concave structure 3571 is approximately 8 mm, which is about 0.2 mm wider than the copper braid 33. Wear-resistant nylon is preferably used for the insulating block. Preferably, the curvature of the arc surface 357 decreases at a slope of 0.8 mm / 10 mm from a position 5 mm from the rotating shaft surface, ensuring that the copper braid 33 smoothly adheres to the rotating shaft surface under gravity.

[0040] During operation, as the shaft 101 rotates, the copper braid 33 floats freely within the concave structure 3571, but its circumferential oscillation is limited to within ±0.2mm. The curved surface 357 guides the copper braid 33 to naturally transition to the shaft surface at a 15° angle, avoiding bending stress. When the copper braid wears 0.5mm, the adjusting screw 355 moves the insulating block 356 down by approximately 0.5mm to compensate for the gap.

[0041] Furthermore, in another embodiment, a limiting post 354 is fixed inside the channel 35; a through limiting groove 359 is provided on the insulating block 356, the length direction of which is parallel to the groove opening 353 of the channel 35; when the insulating block 356 is fitted into the channel 35, the limiting post 354 penetrates the limiting groove 359, and the outer wall of the limiting post 354 slides in fit with the inner wall of the limiting groove 359; when the insulating block 356 slides along the channel 35, its movement stroke is constrained within the length range of the limiting groove 359, and the maximum movement stroke is equal to the length of the limiting groove 359.

[0042] Specifically, a limiting post 354 is vertically fixed to the inner side of the channel 35. In a preferred embodiment, two limiting posts are used. Each limiting post 354 is a solid 304 stainless steel bar with a diameter of 6mm and a length of 20mm, and is fixed to the side plate 302 of the adjustable bracket 30 by welding or threaded connection. The insulating block 356 is machined with a through limiting groove 359, which is a rectangular through groove with a length of 20mm and a width of 6.2mm, and its length direction is parallel to the groove opening 353 of the channel 35. The limiting post 354 and the limiting groove 359 are fitted with a clearance of 0.1mm on each side to ensure that the insulating block 356 slides without jamming. Preferably, in the illustration, the limiting grooves 359 are arranged in pairs corresponding to the limiting posts 354, and the bottom of the groove is 8mm from the bottom surface of the insulating block 356. The stroke is precisely limited to 20mm by the length of the limiting groove 359, and the preferred value is set according to the channel depth and adjustment requirements.

[0043] During assembly, the slot 35 is first fixed to the outside of the side plate 302 of the adjustable bracket 30 with screws or welding, with the slot opening 353 facing the generator shaft 101. The insulating block 356 is pushed in from the slot opening 353 along the bottom of the slot 35, so that the limiting post 354 is embedded in the limiting groove 359. At this time, the insulating block 356 can slide along the slot 35, but its movement range is limited to 0-20mm due to the length of the limiting groove 359. During adjustment, rotating the adjusting screw 355 drives the insulating block 356 to move: when the insulating block 356 slides to the point where one end of the limiting groove 359 contacts the limiting post 354, it is the starting point of the stroke; when it slides to the other end, it is the ending point. This hard limiting design prevents the risk of derailment or collision with the shaft 101 caused by the insulating block 356 extending too far.

[0044] Compared to existing sliding structures without travel limits (such as pure screw-driven unconstrained blocks), this implementation avoids overtravel caused by human error during adjustment, eliminating the risk of limit function failure or component damage. Its technical advantages are: mechanical hard limit ensures adjustment safety and improves maintenance controllability; the sliding process is free of wobbling, ensuring limit accuracy; the structure is simple and reliable, requiring no additional sensors or complex mechanisms.

[0045] Furthermore, in another embodiment, the clamping member 32 is made of 2mm thick 304 stainless steel plate, with dimensions of 50mm in length and 20mm in width, and a Φ3.2mm through hole machined in the middle for screw insertion. The mounting plane 22 of the adjustable bracket 30 side (specifically the side plate 352 of the channel 35 in the illustration) is a 20mm×15mm flat area milled, with an M3 threaded hole in the center. The height of the braided clamping space 23 between the clamping plate and the mounting plane 22 is adjusted by screws. In the fixed state, the height of the space can be set to 1.5-2.5mm to accommodate a cross-sectional area of ​​4-6mm². 2The copper braid 33. M3×10mm socket head cap screws can be used; tightening torque should be controlled to avoid damaging the copper wire. Preferably, both the clamping plate and the mounting surface 22 are provided with an insulating layer to provide insulation and increase the coefficient of friction, aiding in clamping and preventing slippage.

[0046] The detachable structure of this embodiment facilitates maintenance and reduces downtime; the controllable clamping force avoids mechanical damage to the copper wire. Compared with traditional welding fixation, this structure can be disassembled by simply rotating the screw in the opposite direction to loosen the clamping plate, making it easy to replace or maintain the copper braid 33.

[0047] Furthermore, in another embodiment, the copper braid 33 is made of 36 strands of silver-plated soft copper wire, each strand having a diameter of 0.2 mm and a total cross-sectional area of ​​5 mm². 2 The copper braid 33 employs a forked design within a 20mm length, evenly dividing into 6 independent branches (each branch containing 6 single wires). Each branch unfolds in a fan shape, with a branch spacing of approximately 2mm, resulting in a total coverage width of approximately 15mm. When the drooping end of the copper braid 33 naturally overlaps the surface of the generator shaft 101, the contact points at the ends of each branch are distributed along the axial direction of the shaft 101, with an adjacent contact point spacing of approximately 2.5mm.

[0048] Before assembly, the insulation sheath of the last 30mm section of the copper braid 33 is removed, and the exposed stranded wire is placed in the bifurcation mold and fixed. The copper wire is then manually divided into 6 strands and molded into a fan-shaped unfolded structure with an unfolding angle of about 15°. Subsequently, the upper end of the copper braid 33 is fixed to the adjustable bracket 30 using the clamp 32. After installation, when the drooping section naturally overlaps the rotating shaft 101, the 6 bifurcation ends are arranged in a straight line along the axis, and the height difference between adjacent ends and the center line of the rotating shaft 101 is controlled to be ≤0.1mm. When the rotating shaft 101 rotates, each bifurcation end forms an independent contact point with the surface of the rotating shaft 101, and the contact pressure is generated only by the gravity of the copper wire. Compared with the traditional integral copper braid, the bifurcation structure extends the contact area axially to a length of 10mm, dispersing the influence of oil film or surface unevenness.

[0049] Furthermore, in another embodiment, the quick-release interface 24 employs a spring-loaded pin connector. The lead-out end of the copper braid 33 is fixed to the terminal block of the quick-release interface 24 by crimping. The connector housing is made of flame-retardant nylon. The joint between the connector and the copper braid 33 is injection-molded with an epoxy resin sealing layer to prevent stress concentration that could lead to wire breakage. The quick-release interface 24 can be positioned above the clamping member 32 to avoid interference with the adjustable bracket 30. The quick-release interface 24 allows for quick plug-and-play connection with external measuring cables to transmit the acquired shaft voltage signal to the monitoring equipment. During operation, when connecting to the monitoring equipment, simply align the external cable plug axially with the quick-release interface 24 to complete the connection.

[0050] Preferably, in the example, the left and right opposite copper braids 33 are used to collect signals, forming dual sampling points.

[0051] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be easily made by those skilled in the art.

Claims

1. A measuring brush holder structure for monitoring generator shaft voltage, characterized in that, include: An insulating baffle is fixedly installed on the generator end cover by support bolts, and a T-shaped vertical slide rail is provided on the outer side of the insulating baffle; Measuring brush holder, which includes: An adjustable bracket has a T-shaped vertical slide groove on the side facing the insulating baffle that is adapted to the T-shaped vertical slide rail. The T-shaped vertical slide groove and the T-shaped vertical slide rail slide together to realize the sliding adjustment of the adjustable bracket in the vertical direction. The adjustable bracket has a screw hole that passes through its body. The locking screw is screwed into the screw hole, and the end of the locking screw can press against the insulating baffle, thereby fixing the adjustable bracket at the set height position. The clamping element is fixed to the adjustable bracket; The copper braid is clamped and fixed by a clamping component and has a hanging section. A gap of 1-5mm is provided between the clamping component and the surface of the generator shaft. The hanging section of the copper braid, excluding the clamped section, hangs down naturally under its own weight and overlaps the surface of the generator shaft to collect the generator shaft voltage signal.

2. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 1, characterized in that, It also includes an adjustable limit block; the adjustable limit block includes: An insulating block, the bottom surface of which is a smooth insulating plane or arc surface; Adjusting screw; The adjustable bracket has a channel fixedly installed on its side. The channel is composed of a top plate and two side plates. The top is closed and the bottom forms a slot facing the generator shaft. The insulating block is slidably fitted into the channel, and its two sides are in sliding contact with the side plate. A through-threaded hole is provided on the top plate, and a threaded hole is provided at the corresponding position on the top of the insulating block; the adjusting screw is screwed into the through-threaded hole and the threaded hole in sequence, and the insulating block is driven to move away from or closer to the generator shaft along the channel by rotating the adjusting screw; The bottom surface of the insulating block is suspended above the drooping section of the copper braid; by adjusting the position of the insulating block, a gap or contact is maintained between its bottom surface and the copper braid, thus restricting the copper braid to a flat state and naturally overlapping the surface of the generator shaft.

3. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 1 or 2, characterized in that, The bottom surface of the insulating block is curved, and the distance between the curved surface and the surface of the generator shaft gradually decreases, so that the copper braid gradually gets closer to the surface of the shaft under the action of gravity. Furthermore, the middle area of ​​the arc surface forms a concave structure, which restricts the drooping section of the copper braid inside, preventing the copper braid from swinging left and right in the circumferential direction of the rotating shaft.

4. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 3, characterized in that, Limiting posts are fixedly installed on the inner side of the channel; An insulating block has a through-hole limiting groove, the length of which is parallel to the opening of the groove. When the insulating block is fitted into the channel, the limiting post penetrates the limiting groove, and the outer wall of the limiting post slides into the inner wall of the limiting groove; when the insulating block slides along the channel, its movement is constrained within the length range of the limiting groove, and the maximum movement is equal to the length of the limiting groove.

5. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 1, characterized in that, The clamping component is a clamping plate; the adjustable bracket has a mounting surface on its side; the clamping plate is passed through its body by at least one screw and screwed into the threaded hole of the mounting surface; a copper braid clamping space is formed between the clamping plate and the mounting surface; the end of the copper braid passes through the copper braid clamping space; by turning the screw, the clamping plate is driven to move towards the mounting surface, thereby pressing and fixing the copper braid.

6. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 1, characterized in that, The copper braid is composed of multiple strands of forked, silver-plated copper wire; Its naturally overlapping end of the drooping section on the generator shaft surface is fan-shaped, and the contact points between the ends of each branch and the generator shaft surface are distributed along the shaft axis.

7. The measuring brush holder structure for generator shaft voltage monitoring as described in claim 1, characterized in that, The lead-out end of the copper braid is fixedly connected to a quick-release interface; the quick-release interface is quickly plugged into and unplugged from an external measuring cable to transmit the acquired shaft voltage signal to the monitoring equipment.

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