Damping mounting bracket for a rotating electrical machine monitoring device

Abstract

The utility model relates to a kind of damping mounting bracket of rotating electric machine monitoring device, belong to the technical field of electric power related equipment, it includes fixed support main part and elastic damping component;Fixed support main body is L-shaped pedestal, the vertical surface of L-shaped pedestal is equipped with mounting hole, and fixed support main body is fixed in the preset position of generator housing close to ground brush by bolt;The horizontal surface of L-shaped pedestal is equipped with the rectangular recess matched with the bottom of monitoring device box, and elastic damping component is embedded in rectangular recess, and elastic damping component includes upper and lower two layers of elastic rubber pad and the steel plate clamped between two layers of elastic rubber pad;The bottom of monitoring device box is fixed on steel plate by screw, and the nut of screw is completely embedded in steel plate and flush with steel plate surface.This utility model is combined by L-shaped pedestal and elastic damping component, effectively absorbs generator vibration energy, reduces the vibration impact of monitoring device internal electronic component, improves signal acquisition stability and equipment life.

Description

Technical Field

[0001] This utility model belongs to the technical field of power equipment installation equipment, specifically relating to a shock-absorbing mounting bracket for a rotating motor monitoring device used for monitoring the shaft voltage and current at both ends of a generator bearing. Background Technology

[0002] In power plants, steam turbines drive generators to produce electricity. Monitoring devices are installed at the generator bearing ends or shaft extension ends to collect and monitor shaft voltage and current signals. In the field of rotating electrical machine shaft voltage and current monitoring, the installation stability of the monitoring device directly affects the accuracy of the measurement data and the equipment's lifespan. In existing technologies, monitoring devices are typically fixed directly to the generator casing using rigid supports. However, due to the high-frequency vibrations generated during generator operation, rigid supports are unable to effectively attenuate vibration energy, leading to long-term vibration impact on the internal electronic components of the monitoring device, which can easily cause fatigue damage or signal acquisition distortion. Furthermore, loosening or displacement of signal lines caused by vibration can further exacerbate electromagnetic interference, especially when using shielded twisted-pair cables to transmit weak electrical signals. Such interference can lead to increased measurement errors in the effective and peak values ​​of shaft voltage and current.

[0003] Traditional mounting brackets lack flexibility in adjusting their installation position, typically relying on a single fixed hole position. This makes it difficult to adapt to the installation requirements of different generator housing models, especially when space is limited near the grounding brush. Repeated customization of the bracket structure is necessary, increasing installation complexity and cost. Furthermore, the existing grounding copper busbars and the grounding terminals of the monitoring device have poor positional matching. The length and routing of the grounding conductors between them lack optimization, easily introducing additional noise due to uneven grounding loop impedance, and even forming grounding loops, affecting the anti-interference performance of the monitoring device.

[0004] To address the aforementioned issues, designing a support structure that effectively reduces vibration, adapts to various installation scenarios, and optimizes signal line and grounding paths has become a pressing challenge in this field. Existing technologies often encounter problems when using elastic materials for vibration damping, such as unstable damping effects due to improper control of material compression, or plastic deformation after prolonged pressure. Adding auxiliary support structures, on the other hand, presents issues like excessive space requirements and interference with the generator casing. Furthermore, the lack of coordinated design for signal line fixing and grounding further limits the reliability of monitoring devices in complex industrial environments. Utility Model Content

[0005] One objective of this invention is to provide a vibration-damping mounting bracket for a rotating electric motor monitoring device, thereby addressing the technical problem that existing monitoring devices suffer damage to internal electronic components and signal distortion due to generator vibration, necessitating a vibration-damping structure to absorb vibration energy and stably mount the monitoring device.

[0006] To achieve these objectives and other advantages of this utility model, the present utility model provides a shock-absorbing mounting bracket for a rotating motor monitoring device, comprising a fixed bracket body and an elastic shock-absorbing component.

[0007] The main body of the fixed bracket is an L-shaped base. The vertical surface of the L-shaped base is provided with several symmetrically distributed mounting holes, which are used to fix the main body of the fixed bracket to a preset position near the grounding brush of the generator casing by bolts.

[0008] The horizontal surface of the L-shaped base is provided with a rectangular groove that matches the bottom of the monitoring device box. An elastic shock-absorbing component is embedded in the rectangular groove. The elastic shock-absorbing component includes two layers of elastic rubber pads and a steel plate sandwiched between the two layers of elastic rubber pads.

[0009] The bottom of the monitoring device housing is fixed to a steel plate with screws, and the screw nuts are fully embedded in the steel plate and flush with the surface of the steel plate.

[0010] Preferably, the shock-absorbing mounting bracket of the rotating motor monitoring device of this utility model also includes a signal line fixing structure, which includes a U-shaped slot set at the edge of the horizontal plane of the L-shaped base and a nylon cable tie passing through the U-shaped slot. The opening direction of the U-shaped slot is consistent with the signal line lead-out direction of the monitoring device housing.

[0011] Preferably, in the shock-absorbing mounting bracket of the rotary motor monitoring device of this utility model, the U-shaped slot is provided with an arc-shaped limiting surface that matches the outer diameter of the shielded twisted pair cable, and a rubber anti-slip layer is bonded to the surface of the arc-shaped limiting surface.

[0012] Preferably, in the vibration damping mounting bracket of the rotating motor monitoring device of this utility model, an auxiliary support plate is welded to the outer side of the vertical surface of the L-shaped base. A gap of 10mm to 15mm is reserved between the auxiliary support plate and the generator housing. The end of the auxiliary support plate is provided with a bent part extending towards the generator grounding brush. A through hole is opened at the end of the bent part and the grounding copper busbar is fixed by bolts. The grounding copper busbar is connected to the grounding terminal of the monitoring device box through a copper wire.

[0013] Preferably, in the vibration damping mounting bracket of the rotating motor monitoring device of this utility model, the upper and lower layers of elastic rubber pads of the elastic damping component have a thickness of 10mm to 15mm in the uncompressed state, and each layer of elastic rubber pads is provided with a polyurethane damping layer between it and the steel plate; the thickness of the polyurethane damping layer is 2mm to 3mm, and its surface is uniformly distributed with hemispherical protrusions with a diameter of 1mm to 2mm; the four corners of the steel plate are provided with through holes, and pre-tightening bolts are inserted into the through holes. The nuts of the pre-tightening bolts are embedded in the surface of the steel plate, and axial pressure is applied by the nuts to control the compression of the elastic rubber pads to 8mm to 12mm; the compression direction of the elastic rubber pads is consistent with the gravity direction of the monitoring device housing, and a continuous contact surface is formed between the compressed elastic rubber pads and the polyurethane damping layer.

[0014] Preferably, in the vibration damping mounting bracket of the rotating motor monitoring device of this utility model, the vertical surface of the L-shaped base is provided with three sets of mounting holes along its length. Each set of mounting holes includes two symmetrically distributed mounting holes, and the center distance between adjacent sets of mounting holes is 50mm to 80mm. The diameter of each mounting hole in the mounting hole set is 12mm to 14mm, and a stainless steel bushing is pre-embedded in the hole. The outer wall of the stainless steel bushing is interference-fitted with the mounting hole, and the inner wall is provided with threads matching M10 bolts. The horizontal plane of the L-shaped base is perpendicular to the vertical plane. A triangular reinforcing rib is welded at the joint of the surfaces. The thickness of the reinforcing rib is 5mm to 8mm, and its right-angled sides are respectively attached to the horizontal and vertical surfaces. A T-shaped groove is provided on the outer side of the vertical surface of the L-shaped base. A movable slider is embedded in the T-shaped groove. The slider is fixed in a preset position by locking bolts. An auxiliary support plate is welded to the end of the slider. A through hole is opened at the free end of the auxiliary support plate and a grounding copper busbar is fixed by bolts. The installation position of the grounding copper busbar is on the same horizontal plane as the grounding terminal of the monitoring device box.

[0015] This utility model has at least the following beneficial effects:

[0016] 1. This utility model effectively absorbs generator vibration energy through the combination design of L-shaped base and elastic shock absorption components, reduces vibration impact on internal electronic components of the monitoring device, and improves signal acquisition stability and equipment lifespan.

[0017] 2. To address the issue of electromagnetic interference caused by the loosening of shielded twisted-pair cables due to vibration or displacement of signal lines, and the need to optimize cable fixing methods to reduce signal transmission noise, this utility model uses a U-shaped slot and nylon cable ties to fix the direction of the shielded twisted-pair cable, reducing electromagnetic interference caused by cable displacement and ensuring the transmission accuracy of shaft voltage / current signals.

[0018] 3. To address the issue that shielded twisted-pair cables are prone to sliding or wear within the slot, requiring additional limiting and anti-slip designs to improve cable fixation reliability, this utility model combines an arc-shaped limiting surface with a rubber anti-slip layer to prevent shielded twisted-pair cables from sliding or wearing within the slot, thereby improving cable fixation reliability and vibration resistance.

[0019] 4. To address the uneven grounding circuit impedance caused by the positional deviation between the grounding copper busbar and the grounding terminal of the monitoring device, an auxiliary support plate is needed to adjust the grounding path and ensure grounding coordination. This invention optimizes the grounding circuit path through the coordinated design of the auxiliary support plate and the grounding copper busbar, reducing noise interference caused by uneven grounding impedance and enhancing the anti-interference capability of the monitoring device.

[0020] 5. To address the issue of uncontrollable compression of the elastic rubber pad leading to unstable damping performance, it is necessary to adjust the compression amount using pre-tightening bolts to improve damping consistency. This invention precisely controls the compression amount of the elastic rubber pad using pre-tightening bolts, combined with the raised structure of the polyurethane damping layer, to stabilize the damping effect and prevent plastic deformation of the material after long-term pressure.

[0021] 6. Traditional L-shaped bases have only one set of mounting holes, making it difficult to adapt to different generator housings. Multiple sets of mounting holes and sliding groove structures are needed to improve installation flexibility. This invention, through multiple sets of mounting holes, T-shaped sliding grooves, and an adjustable slider structure, adapts to the installation needs of different generator housings, reducing the processing cost and installation complexity of customized brackets.

[0022] 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

[0023] Figure 1 This is a schematic diagram of the installation location structure of the monitoring device of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the shock-absorbing mounting bracket described in this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the elastic shock absorption component described in this utility model;

[0026] Figure 4 This is a schematic diagram of the auxiliary support plate described in this utility model.

[0027] Among them, there is a steam turbine 40, a generator 30, a monitoring device 20, a vibration damping mounting bracket 10, an L-shaped base 101, a vertical surface 102, a horizontal surface 103, an elastic vibration damping component 104, a steel plate 1041, an elastic rubber pad 1042, a damping layer 1043, a hemispherical protrusion 1044, a screw 105, a rectangular groove 106, a mounting hole 107, a U-shaped slot 108, a nylon cable tie 109, a rubber anti-slip layer 110, an auxiliary support plate 111, a bending part 112, a grounding copper busbar 113, a T-shaped slide 112, a reinforcing rib 113, a slider 114, a through channel 115, and a locking bolt 116. Detailed Implementation

[0028] 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.

[0029] As shown in Figures 1-4, in a power plant, a steam turbine 40 drives a generator 30 to rotate. Monitoring devices need to be installed at both ends of the generator 30 shaft for monitoring. The present invention provides a vibration damping mounting bracket 10 for a rotating motor monitoring device 20, which includes a fixed bracket body and an elastic vibration damping component.

[0030] The main body of the fixed bracket is an L-shaped base 101. The vertical surface 102 of the L-shaped base 101 is provided with several symmetrically distributed mounting holes 107, which are used to fix the main body of the fixed bracket to a preset position near the grounding brush of the generator 30 housing by bolts.

[0031] The horizontal surface 103 of the L-shaped base 101 is provided with a rectangular groove 106 that matches the bottom of the monitoring device 20 box. An elastic shock-absorbing component 104 is embedded in the rectangular groove 106. The elastic shock-absorbing component 104 includes two layers of elastic rubber pads 1042 and a steel plate 1041 sandwiched between the two layers of elastic rubber pads 1042.

[0032] The bottom of the monitoring device 20 housing is fixed to the steel plate 1041 by screws 105. The nuts of the screws 105 are fully embedded in the steel plate 1041 and flush with its surface. The steel plate 1041 is connected to the bottom of the rectangular groove 106 by bolts. The bolts pass through the pre-drilled holes at the bottom of the groove and apply axial pressure, ensuring that the elastic damping component 104 fits tightly against the bottom surface of the groove, preventing the component from detaching during vibration. In this embodiment, the elastic damping component 104 achieves a fixed fit with the rectangular groove 106 through an embedded structure, pre-tightened bolts, and rigid connection, ensuring both damping effect and preventing signal line loosening or measurement inaccuracy caused by component displacement due to vibration.

[0033] The L-shaped base 101 can be formed by bending Q235 carbon steel plate with a thickness of 5mm to 8mm. Its vertical surface 102 has at least two sets of symmetrically distributed mounting hole groups, each group containing two mounting holes 107 with a diameter of 12mm to 14mm and a center-to-center distance of 60mm to 80mm. A stainless steel bushing with an outer diameter of 14mm and an inner diameter of 10mm can be pre-embedded in the mounting hole 107. The stainless steel bushing is interference-fitted with the mounting hole 107 and has an M10 thread machined on its inner wall. The vertical surface 102 of the L-shaped base 101 is fixed to the generator 30 housing at a preset position near the grounding brush by M10 bolts. The bolt length is selected from 50mm to 80mm according to the thickness of the generator 30 housing.

[0034] The elastic damping component 104 is embedded in a rectangular groove 106 on the horizontal surface 103 of the L-shaped base 101. The depth of the rectangular groove 106 is 20mm to 25mm, and its width matches the bottom of the monitoring device 20 housing. The elastic damping component 104 includes two 12mm thick nitrile rubber pads, and a 3mm thick A3 steel plate 1041 sandwiched between the two rubber pads. The nitrile rubber pads have a Shore hardness of 60HA to 70HA and a temperature resistance range of -30℃ to 100℃. The steel plate 1041 has 8mm diameter through holes at its four corners, with the center of the through holes 15mm to 20mm from the edge of the steel plate 1041.

[0035] The bottom of the monitoring device 20 enclosure is secured to the steel plate 1041 by four sets of M8 countersunk screws 105. The screws 105 are 25mm to 30mm long, with nuts of 14mm diameter. The mounting holes for the countersunk screws 105 are located at the corresponding positions of the through holes at the four corners of the steel plate 1041, with a hole diameter of 8.5mm and a countersunk depth of 1mm to 5mm. During installation, the screw nuts 105 are fully embedded in the countersunk holes, ensuring they are flush with the surface of the steel plate 1041 to prevent protrusion and tilting of the enclosure.

[0036] In this embodiment, the L-shaped base 101, through the stainless steel bushing and M10 bolts, enhances the wear resistance of the mounting hole 107, adapts to different generator 30 housing thicknesses (10mm to 30mm), and reduces the risk of deformation of the mounting hole 107; the Shore hardness and temperature range of the nitrile rubber pad match the requirements of industrial environments, and combined with the rigid support of the steel plate 1041, achieves a vibration energy absorption rate of ≥40%, reducing the vibration acceleration of the internal electronic components of the monitoring device 20 to below 0.5g; the flush installation of the countersunk screws 105 avoids uneven stress on the housing, ensuring that the levelness error of the monitoring device 20 is ≤0.5mm / m, and improving the stability of signal acquisition.

[0037] Furthermore, in another embodiment, the shock-absorbing mounting bracket 10 of the rotary motor monitoring device 20 of this utility model also includes a signal line fixing structure, which includes a U-shaped slot 108 disposed at the edge of the horizontal plane 103 of the L-shaped base 101 and a nylon cable tie 109 passing through the U-shaped slot 108. The opening direction of the U-shaped slot 108 is consistent with the signal line lead-out direction of the monitoring device 20 housing.

[0038] The U-shaped slot 108 can be formed from an aluminum alloy profile with a width of 20mm to 25mm and a depth of 10mm to 15mm, and its opening direction is parallel to the signal line lead-out direction of the monitoring device 20 housing. The U-shaped slot 108 is located at the edge of the horizontal plane 103 of the L-shaped base 101. The inner surface of the slot can be coated with an insulating coating with a thickness of 0.1mm to 0.2mm. The coating material is epoxy resin with a voltage withstand rating of ≥3kV.

[0039] The nylon cable tie 109 can be a standard model with a width of 15mm and a length of 300mm, and its tensile strength is ≥200N. The nylon cable tie 109 passes through the reserved holes of the U-shaped slot 108, with a hole diameter of 6mm to 8mm and a hole spacing of 50mm to 80mm. The two ends of the nylon cable tie 109 are secured by self-locking buckles. During installation, the signal cable, such as a shielded twisted pair cable, is pressed between the arc-shaped bottom surface of the U-shaped slot 108 and the nylon cable tie 109, with the clamping force controlled between 5N and 10N.

[0040] The signal cable, such as shielded twisted-pair cable, has an outer diameter of 8mm to 12mm. Its outer shielding layer can be made of copper braided mesh with a coverage rate of ≥90%. After the signal cable is led out from the monitoring device 20 enclosure, it is laid along the arc-shaped limiting surface of the U-shaped slot 108. The shielding layer contacts the metal surface of the U-shaped slot 108 through a grounding terminal, with a grounding resistance ≤0.1Ω.

[0041] In this embodiment, the aluminum alloy material of the U-shaped slot 108, combined with the insulating coating, ensures structural strength and avoids parasitic capacitance between the signal line and the metal slot, reducing high-frequency interference. The compression of the nylon cable tie 109 ensures that the displacement of the shielded twisted pair cable is ≤1mm under vibration, reducing the signal transmission fluctuation rate to below 2%. The shielding layer is grounded through the slot, forming a continuous shielding loop, which attenuates the common-mode interference of the shaft voltage signal by ≥20dB, improving measurement accuracy.

[0042] Furthermore, in another embodiment, in the shock-absorbing mounting bracket 10 of the rotary motor monitoring device 20 of this utility model, the U-shaped slot 108 is provided with an arc-shaped limiting surface that matches the outer diameter of the shielded twisted pair, and a rubber anti-slip layer 110 is bonded to the surface of the arc-shaped limiting surface.

[0043] Specifically, the radius of curvature of the arc-shaped limiting surface can be designed to be 15mm to 20mm, matching the outer diameter (8mm to 12mm) of the signal line, such as shielded twisted-pair cable. The limiting surface is machined by CNC milling, with a surface roughness Ra≤3.2μm.

[0044] The rubber anti-slip layer 110 can be made of styrene-butadiene rubber sheet with a thickness of 2mm to 3mm. Its surface is vulcanized with diamond-shaped anti-slip patterns, with a pattern depth of 0.5mm to 1mm. The back of the rubber anti-slip layer 110 is coated with epoxy resin adhesive with a bonding strength ≥5MPa, and it is bonded to the arc-shaped limiting surface. After bonding, the edge of the rubber anti-slip layer 110 extends 2mm to 3mm beyond the boundary of the limiting surface to prevent direct contact between the signal cable and the metal tank.

[0045] When laying signal cables such as shielded twisted-pair cables, the center axis of the cable should be aligned with the center of the arc-shaped limiting surface, with a deviation of ≤1mm. After installation, the lateral displacement of the cable within the U-shaped slot 108 is verified by a tensile test, and the displacement is ≤0.5mm when a horizontal tensile force of 10N is applied.

[0046] In this embodiment, the radius of curvature of the arc-shaped limiting surface matches the outer diameter of the cable, reducing the bending stress of the cable; the diamond-pattern design of the rubber anti-slip layer 110 increases the static friction between the signal cable and the slot to ≥8N, suppressing cable slippage caused by vibration; the bonding ensures that the rubber anti-slip layer 110 is tightly bonded to the limiting surface, and the peel strength remains ≥3MPa after long-term use, extending the life of the anti-slip structure.

[0047] Furthermore, in another embodiment, preferably, in the shock-absorbing mounting bracket 10 of the rotating motor monitoring device 20 of this utility model, an auxiliary support plate 111 is welded to the outer side of the vertical surface 102 of the L-shaped base 101. A gap of 10mm to 15mm is reserved between the auxiliary support plate 111 and the outer casing of the generator 30. The end of the auxiliary support plate 111 is provided with a bent portion 112 extending towards the grounding brush of the generator 30. A through hole is opened at the end of the bent portion 112 and the grounding copper busbar 113 is fixed by bolts. The grounding copper busbar 113 is connected to the grounding terminal of the monitoring device 20 housing by a copper wire.

[0048] The auxiliary support plate 111 can be made of Q235 steel plate with a thickness of 4mm to 6mm, a width of 50mm to 80mm, and a length of 200mm to 300mm depending on the height of the vertical surface 102 of the L-shaped base 101. The auxiliary support plate 111 is welded to the outside of the vertical surface 102 of the L-shaped base 101 by continuous welds, with a weld height of 3mm to 5mm and a weld spacing of 100mm to 150mm. A 12mm gap is reserved between the auxiliary support plate 111 and the generator 30 housing, with the gap tolerance controlled within ±1mm, to avoid interference with the housing during installation.

[0049] The auxiliary support plate 111 has a bent portion 112 extending towards the grounding brush of the generator 30 at its end, with a bending angle of 90° to 120° and a bending radius of 10mm to 15mm. Two through holes with a diameter of 8mm are opened at the end of the bent portion 112, with a center distance of 20mm to 30mm. A T2 copper grounding busbar 113 with a cross-sectional area of ​​30mm × 4mm is fixed by M8 stainless steel bolts. The bolt torque is controlled between 10N·m and 12N·m, and spring washers are added to prevent loosening.

[0050] The grounding copper busbar 113 is connected to the grounding terminal of the monitoring device 20 enclosure via a soft copper stranded wire with a cross-sectional area of ​​6 mm². OT terminals are crimped to both ends of the copper stranded wire, with a terminal hole diameter of 8 mm. The grounding copper busbar 113 is installed at the same horizontal plane as the grounding terminal of the monitoring device 20, with a height deviation ≤ 2 mm. The grounding loop resistance is ≤ 0.05 Ω, verified by a grounding resistance tester.

[0051] In this embodiment, the thickness of the auxiliary support plate 111 ensures structural rigidity, and the 12mm gap avoids deformation interference caused by the thermal expansion of the generator 30 casing; the angle of the bending part 112 and the bolt fixing method are adapted to different grounding brush positions, and the horizontal deviation of the grounding copper busbar 113 is ≤1mm, reducing the risk of uneven grounding impedance; the 6mm² soft copper stranded wire connection method with the OT terminal ensures that the grounding loop resistance fluctuation rate is ≤5%, effectively suppressing the influence of common mode interference on shaft voltage measurement.

[0052] Furthermore, in another embodiment, preferably, in the vibration damping mounting bracket 10 of the rotary motor monitoring device 20 of this utility model, the upper and lower layers of elastic rubber pads 1042 of the elastic damping component 104 have a thickness of 10mm to 15mm in the uncompressed state, and a damping layer 1043 is provided between each layer of elastic rubber pad 1042 and the steel plate 1041; the thickness of the damping layer 1043 is 2mm to 3mm, and its surface is uniformly distributed with hemispherical protrusions 1044 with a diameter of 1mm to 2mm; the four corners of the steel plate 1041 are provided with through holes, and pre-tightening bolts are inserted into the through holes. The nuts of the pre-tightening bolts are embedded in the surface of the steel plate 1041, and axial pressure is applied by the nuts to control the compression of the elastic rubber pad 1042 to 8mm to 12mm; the compression direction of the elastic rubber pad 1042 is consistent with the gravity direction of the monitoring device 20 housing, and a continuous contact surface is formed between the compressed elastic rubber pad 1042 and the damping layer 1043.

[0053] The elastic rubber pad 1042 can be made of nitrile rubber material with a thickness of 12mm in its uncompressed state, having a Shore hardness of 65HA to 70HA and a temperature resistance range of -20℃ to 100℃. A damping layer 1043 with a thickness of 2.5mm is provided between each layer of elastic rubber pad 1042 and the steel plate 1041. This layer is made of polyurethane material with a density of 1.1g / cm³ to 1.3g / cm³, and its surface is uniformly distributed with hemispherical protrusions 1044 with a diameter of 1.5mm and a spacing of 3mm to 5mm. The damping layer 1043 is bonded to the steel plate 1041 and the elastic rubber pad 1042 with epoxy resin adhesive, with a bonding strength ≥6MPa.

[0054] Through holes with a diameter of 10mm are made at the four corners of steel plate 1041, with the center of each hole 15mm to 20mm from the edge of steel plate 1041. M12 preload bolts are used, with a length of 50mm to 60mm and a nut diameter of 20mm. The nuts are embedded in countersunk holes on the surface of steel plate 1041, with a countersunk hole depth of 5mm to 6mm. Axial pressure is applied by the nuts to control the compression of the elastic rubber pad 1042 to 10mm, with the compression direction consistent with the direction of gravity of the monitoring device 20 housing. During installation, a torque wrench is used to control the nut torque to 25N·m to 30N·m to ensure uniform compression.

[0055] The compressed elastic rubber pad 1042 and the damping layer 1043 form a continuous contact surface with a contact area of ​​≥95%. The hemispherical protrusions 1044 of the damping layer 1043 are embedded in the surface of the elastic rubber pad 1042 after compression, forming a mechanical interlock and suppressing vibration transmission.

[0056] In this embodiment, the hardness of the nitrile rubber pad and the damping layer 1043 are matched, which increases the vibration energy absorption rate to ≥45% and reduces the internal vibration acceleration of the monitoring device 20 to below 0.3g; the torque control and compression design of the pre-tightening bolts ensure that the plastic deformation of the elastic damping component 104 is ≤1mm after long-term use, thus extending the service life of the damping structure; the mechanical interlocking design between the hemispherical protrusion 1044 structure and the elastic rubber pad 1042 increases the high-frequency vibration attenuation rate by ≥15% and reduces transient interference during signal acquisition.

[0057] Furthermore, in another embodiment, preferably, in the vibration damping mounting bracket 10 of the rotating motor monitoring device 20 of this utility model, the vertical surface 102 of the L-shaped base 101 is provided with three sets of mounting holes along its length, each set of mounting holes includes two symmetrically distributed mounting holes 107, and the center distance between adjacent mounting hole sets is 50mm to 80mm; the diameter of each mounting hole 107 in the mounting hole set is 12mm to 14mm, and a stainless steel bushing is pre-embedded in the hole, the outer wall of the stainless steel bushing is interference-fitted with the mounting hole 107, and the inner wall is provided with threads matching M10 bolts; a triangular reinforcing rib plate 113 is welded at the connection between the horizontal surface 103 and the vertical surface 102 of the L-shaped base 101, the thickness of the triangular reinforcing rib plate 113 is 5mm to 8mm, and its right-angled sides are respectively attached to the horizontal surface 103 and the vertical surface 102; a T-shaped reinforcing rib plate is provided on the outer side of the vertical surface 102 of the L-shaped base 101. The T-shaped slide 112 has a movable slider 114 embedded in it. The slider 114 is fixed in a preset position by locking bolts 116. A through channel 115 is opened at the corresponding position on the vertical surface 102 of the L-shaped base 101. An auxiliary support plate 111 is welded to the end of the slider 114. A through hole is opened at the free end of the auxiliary support plate 111 and a grounding copper busbar 113 is fixed by bolts. The installation position of the grounding copper busbar 113 is at the same horizontal plane as the grounding terminal of the monitoring device 20 box.

[0058] The L-shaped base 101 has three sets of mounting holes along its length on its vertical surface 102. Each set contains two symmetrically distributed mounting holes 107, with a center-to-center distance of 60mm to 70mm between adjacent mounting hole sets. The mounting hole 107 has a diameter of 13mm, and a stainless steel bushing with an outer diameter of 14mm and an inner diameter of 10.5mm is pre-embedded inside the hole. The bushing is made of 304 stainless steel, and the outer wall of the bushing has an interference fit tolerance of H7 / p6 with the mounting hole 107. The inner wall is machined with M10×1.5 threads. The mounting hole sets are fixed to the generator 30 housing at predetermined positions using M10 bolts. The bolt length is selected from 50mm to 70mm depending on the housing thickness.

[0059] At the junction of the horizontal surface 103 and the vertical surface 102 of the L-shaped base 101, a 6mm thick Q235 steel triangular reinforcing rib plate 113 is welded. The right-angled sides of the triangular reinforcing rib plate 113 are 50mm and 80mm long, respectively, and the weld height is 4mm to 5mm. The outer side of the vertical surface 102 is machined.

[0060] A T-shaped groove 112 with a width of 12mm and a depth of 8mm is machined on the outer side of the vertical surface. The length of the groove is the same as the height of the vertical surface 102 of the base. An aluminum alloy slider 114 with a width of 10mm and a height of 15mm is embedded in the T-shaped groove 112. The slider 114 is fixed in a preset position by an M6 locking bolt 116.

[0061] A 4mm thick auxiliary support plate 111 is welded to the end of the slider 114. Two 8mm diameter through holes are opened at the free end of the auxiliary support plate 111, with a center-to-center distance of 25mm between the holes. The grounding copper busbar 113 is a 30mm x 4mm T2 copper busbar, fixed to the through holes with M8 stainless steel bolts. The height difference between the mounting plane of the grounding copper busbar 113 and the grounding terminal of the monitoring device 20 enclosure is ≤2mm. The two are connected by a 6mm² soft copper stranded wire, and the grounding loop resistance is ≤0.05Ω.

[0062] In this embodiment, multiple sets of mounting holes 107 are fitted with stainless steel bushings to accommodate different generator 30 housing thicknesses (10mm to 25mm), reducing the need for customized bracket processing and improving installation efficiency by more than 30%. The design of triangular reinforcing ribs 113 and T-shaped slides 112 increases the bending strength of the L-shaped base 101 by ≥40%, and the displacement accuracy of the slider 114 is controlled within ±1mm, meeting the need for flexible adjustment of the grounding copper busbar 113 position. The highly coordinated design of the grounding copper busbar 113 and the grounding terminal of the monitoring device 20 ensures that the grounding circuit impedance fluctuation rate is ≤3%, effectively suppressing common-mode noise in shaft voltage measurement.

[0063] One implementation process of this utility model is as follows:

[0064] Step 1: Select Q235 carbon steel plate with a thickness of 5mm to 8mm, and process it into an L-shaped base 101 using a bending machine. The bending angle between the vertical surface 102 and the horizontal surface 103 is 90°. Three sets of mounting holes 107 are machined along the length of the vertical surface 102. Each set contains two mounting holes 107 with a diameter of 13mm. 304 stainless steel bushings are pre-embedded in the holes, and M10 threads are machined on the inner wall of the bushings.

[0065] Align the vertical face 102 of the L-shaped base 101 with the preset position of the generator 30 housing near the grounding brush, and use M10 bolts to pass through the mounting holes 107. The bolt length is selected from 50mm to 70mm according to the housing thickness, and the torque is controlled from 25N・m to 30N・m.

[0066] Step 2: Embed the elastic damping component 104 in the rectangular groove 106 of the horizontal plane 103 of the L-shaped base 101. The component consists of two layers of nitrile elastic rubber pads 1042 (12mm thick, Shore hardness 65HA to 70HA) and a steel plate 1041 (3mm thick) sandwiched in the middle. A damping layer 1043 (2.5mm thick, with a 1.5mm diameter hemispherical protrusion 1044 on the surface) is bonded between the elastic rubber pads 1042 and the steel plate 1041.

[0067] M12 preloaded bolts are inserted into the four through holes of steel plate 1041, and nuts are inserted into the countersunk holes of steel plate 1041. Axial pressure is applied through the nuts to control the compression of elastic rubber pad 1042 to 10mm. The nut torque is 25N·m to 30N·m.

[0068] Step 3: Align the bottom of the monitoring device 20 housing with the steel plate 1041 and fix it with four sets of M8 countersunk screws 105. The screws 105 are 25mm to 30mm long and the countersunk holes are 4mm to 5mm deep, ensuring that the surface of the screws 105 is flush with the steel plate 1041.

[0069] Use a level to check the mounting surface of the box, and adjust the bolt pressure to ensure that the levelness error is ≤0.5mm / m.

[0070] Step 4: Set a U-shaped slot 108 at the edge of the horizontal plane 103 of the L-shaped base 101. A rubber anti-slip layer 110 (2mm thick, with a diamond-patterned surface) is bonded to the arc-shaped limiting surface inside the U-shaped slot 108. The shielded twisted-pair signal cable is laid along the arc-shaped surface of the U-shaped slot 108 with a bending radius ≥50mm, and secured with nylon cable ties 109 (15mm wide) with a clamping force of 5N to 10N.

[0071] An auxiliary support plate 111 (Q235 steel plate, 4mm to 6mm thick) is welded to the outside of the vertical surface 102 of the L-shaped base 101. The bent part 112 at the end of the auxiliary support plate 111 is fixed with a T2 copper grounding busbar 113 by M8 bolts. The grounding busbar 113 is connected to the grounding terminal of the monitoring device 20 by a 6mm² soft copper stranded wire, and the grounding circuit resistance is ≤0.05Ω.

[0072] Step 5: Use a vibration tester to measure the vibration acceleration of the monitoring device 20 enclosure and ensure it is ≤0.3g; use an oscilloscope to test the shaft voltage signal transmitted through the shielded twisted pair cable and ensure the common-mode interference attenuation is ≥20dB; use a grounding resistance tester to verify the resistance between the grounding copper busbar 113 and the grounding terminal and ensure it is ≤0.05Ω.

[0073] 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 vibration damping mounting bracket for a rotating electric motor monitoring device, characterized in that, Includes the main body of the fixed support and the elastic shock absorption components; The main body of the fixed bracket is an L-shaped base. The vertical surface of the L-shaped base is provided with several symmetrically distributed mounting holes, which are used to fix the main body of the fixed bracket to a preset position near the grounding brush of the generator casing by bolts. The horizontal surface of the L-shaped base is provided with a rectangular groove that matches the bottom of the monitoring device box. An elastic shock-absorbing component is embedded in the rectangular groove. The elastic shock-absorbing component includes two layers of elastic rubber pads and a steel plate sandwiched between the two layers of elastic rubber pads. The bottom of the monitoring device housing is fixed to a steel plate with screws, and the screw nuts are fully embedded in the steel plate and flush with the surface of the steel plate.

2. The vibration damping mounting bracket for the rotating electric motor monitoring device as described in claim 1, characterized in that, It also includes a signal line fixing structure, which includes a U-shaped slot set at the edge of the horizontal plane of the L-shaped base and a nylon cable tie passing through the U-shaped slot. The opening direction of the U-shaped slot is consistent with the signal line lead-out direction of the monitoring device box.

3. The vibration damping mounting bracket for the rotating motor monitoring device as described in claim 2, characterized in that, The U-shaped slot has an arc-shaped limiting surface that matches the outer diameter of the shielded twisted pair cable, and a rubber anti-slip layer is bonded to the surface of the arc-shaped limiting surface.

4. The vibration damping mounting bracket for the rotating motor monitoring device as described in claim 3, characterized in that, An auxiliary support plate is welded to the outer side of the vertical surface of the L-shaped base. A 10mm-15mm gap is reserved between the auxiliary support plate and the generator housing. The end of the auxiliary support plate is provided with a bent part extending towards the generator grounding brush. A through hole is opened at the end of the bent part and the grounding copper busbar is fixed with bolts. The grounding copper busbar is connected to the grounding terminal of the monitoring device box through a copper wire.

5. The vibration damping mounting bracket for the rotating electric motor monitoring device according to claim 1, characterized in that: The upper and lower elastic rubber pads of the elastic damping component are 10mm-15mm thick when uncompressed, and each elastic rubber pad is provided with a polyurethane damping layer between it and the steel plate; the polyurethane damping layer is 2mm-3mm thick, and its surface is uniformly distributed with hemispherical protrusions with a diameter of 1mm-2mm. The steel plate has through holes at its four corners, and pre-tightening bolts are inserted into the through holes. The nuts of the pre-tightening bolts are embedded in the surface of the steel plate, and axial pressure is applied by the nuts to control the compression of the elastic rubber pad to 8mm-12mm. The compression direction of the elastic rubber pad is consistent with the gravity direction of the monitoring device housing, and a continuous contact surface is formed between the compressed elastic rubber pad and the polyurethane damping layer.

6. The vibration damping mounting bracket for the rotating electric motor monitoring device according to claim 1, characterized in that: The vertical surface of the L-shaped base is provided with three sets of mounting holes along the length direction. Each set of mounting holes contains two symmetrically distributed mounting holes, and the center-to-center distance between adjacent sets of mounting holes is 50mm-80mm. The diameter of each mounting hole in the mounting hole group is 12mm-14mm, and a stainless steel bushing is pre-embedded in the hole. The outer wall of the stainless steel bushing is interference-fitted with the mounting hole, and the inner wall is provided with threads that match the M10 bolt. A triangular reinforcing rib is welded at the connection between the horizontal and vertical surfaces of the L-shaped base. The thickness of the reinforcing rib is 5mm-8mm, and its right-angled sides are respectively attached to the horizontal and vertical surfaces. The L-shaped base has a T-shaped groove on the outer side of its vertical surface. A movable slider is embedded in the T-shaped groove and is fixed in a preset position by a locking bolt. An auxiliary support plate is welded to the end of the slider. A through hole is opened at the free end of the auxiliary support plate and a grounding copper busbar is fixed by bolts. The installation position of the grounding copper busbar is at the same level as the grounding terminal of the monitoring device box.

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