A vibration measurement fixture for bearing assemblies

Abstract

This utility model relates to the field of vibration measurement technology, specifically to a vibration measurement fixture for bearing assemblies, including a bracket, a support platform, a vacuum chamber, and a vibration measurement component. The bracket includes four columns and eight crossbeams. The columns are vertically arranged and distributed in a ring. Each group of four crossbeams forms a rectangular frame. Two groups of crossbeams are located at the top and bottom of the columns. The four columns and eight crossbeams form a cuboid frame structure. The cuboid frame structure of the bracket facilitates inverting or laying flat after assembling the workpiece to be measured, simulating the operating conditions of a bearing in its upright, inverted, and flat positions, thus improving the accuracy of the test. Simultaneously, the external laser detection head prevents vibration-induced loosening, further enhancing the accuracy of the vibration measurement.

Description

Technical Field

[0001] This utility model relates to the field of vibration measurement technology, specifically to a vibration measurement fixture for bearing assemblies. Background Technology

[0002] Vibration measurement of bearing assemblies is a crucial method for equipment condition monitoring and fault diagnosis. Analyzing vibration signals can promptly detect problems such as bearing wear, fatigue, and misalignment. One of the key technologies for obtaining long-life, high-performance inertial actuators in spacecraft attitude control systems is acquiring a bearing unit rotation support system with low friction and wear and reliable operation. For bearing assemblies, vibration effectively reflects the comprehensive characteristics of bearing unit operation. Vibration is highly sensitive to early, minute defects in bearing units. Therefore, without disassembling or stopping the bearing unit, vibration testing can be used to understand relevant parameters, monitor the operating status of the bearing unit, determine whether it is functioning correctly as a whole or in parts, and detect early defects.

[0003] In the prior art, such as the Chinese patent with publication number CN215811633U entitled "A Vibration Testing Device for a Bearing Unit," the disclosed technical solution describes that an inner ring support shaft is provided on a fixed plate, and an outer ring support frame is sleeved on the outside of the inner ring support shaft. A bearing unit is installed between the inner ring support shaft and the outer ring support frame. The bearing unit includes two bearings used in pairs. Each bearing includes an inner ring and an outer ring. An inner spacer is provided between the two inner rings of the bearings, and an outer spacer is provided between the two outer rings of the bearings. The inner rings and inner spacers of the two bearings are correspondingly fixedly fitted on the inner ring support shaft to achieve pre-tight fixed assembly. The outer rings and outer spacers of the two bearings are correspondingly fixedly installed on the outer ring support frame. An outer rotor motor is sleeved on the outer ring support frame. The stator of the outer rotor motor and the inner ring support shaft are fixedly connected to the fixed plate by bolts. The motor rotor and the outer ring support frame are bolted together. A rigid connecting piece is fixedly installed on the top of the inner ring support shaft. The upper end of the rigid connecting piece is connected to a vibration sensor by a thread. The vibration sensor is a triaxial vibration sensor. After installation, the vacuum chamber is covered to form a sealed space, and the air inside is extracted using a vacuum suction device to create a vacuum. During testing, the external rotor motor is started, and the vibration sensor data is converted by an A / D converter and transmitted to the host computer. The A / D converter converts the vibration signals collected by the triaxial vibration sensor into digital signals, and the host computer uses signal processing methods to extract vibration information parameters. However, the vibration sensors at the upper end of the rigid connector are connected by threads. Vibration during testing may cause the vibration sensors to loosen, thus affecting the accuracy of the test results, which has certain limitations. Utility Model Content

[0004] This invention provides a vibration measuring fixture for bearing assemblies to solve the above-mentioned problems.

[0005] The present invention adopts the following technical solution: a bearing assembly vibration measuring fixture, comprising a bracket, a support platform, a vacuum shroud, and a vibration measuring component;

[0006] The support structure consists of four uprights and eight crossbeams. The uprights are vertically arranged and distributed in a ring. The eight crossbeams are arranged in groups of four, with each group forming a rectangular frame. Two groups of crossbeams are located at the top and bottom of the uprights. The four uprights and eight crossbeams form a cuboid frame structure. The uprights and adjacent crossbeams are fixedly connected.

[0007] The support platform is located between the four columns; the support platform and the columns are fixedly connected by bolts; an I-beam bracket is fixed at the center of the support platform.

[0008] The vacuum hood is fitted onto the outside of the I-beam bracket with its opening facing downwards, and its lower end is sealed and abuts against the support platform;

[0009] The vibration measurement assembly consists of three components, each including a mounting plate. Two of the mounting plates are fixed to adjacent columns, while the remaining mounting plate is fixed to the upper crossbeam via a connecting plate. The mounting plates have arc-shaped placement holes containing laser detection heads. Laser light is emitted from these holes onto the object being measured. Two bolts are threaded onto the mounting plates, securing the laser detection heads within the placement holes for centering and stability. The laser detection heads of the three vibration measurement components correspond to the x, y, and z directions of the orthogonal coordinate axes, respectively. The support frame has a rectangular shape, allowing the assembly to be inverted or laid flat after the workpiece is assembled, simulating the operation of a bearing in its upright, inverted, and flat positions, thus improving measurement accuracy. Simultaneously, the externally mounted laser detection heads prevent vibration-induced loosening, further enhancing vibration measurement accuracy.

[0010] Furthermore, the columns and adjacent crossbeams are fixedly connected by screws for easy disassembly; each end of the column has two sets of mounting holes; each set contains two mounting holes; the two sets of mounting holes are located on the adjacent vertical sidewalls of the column; the two sets of mounting holes are staggered vertically, and their axes are perpendicular; each end of the crossbeam has two sets of threaded holes on its vertical endwalls; each set contains two threaded holes; the two sets of threaded holes are staggered vertically, and their axes are parallel; the staggered mounting holes and mating holes facilitate assembly by simply aligning any column and any crossbeam and screwing in the bolts from the corresponding mounting holes, avoiding the installation complexity caused by inconsistent specifications, enabling blind selection installation and improving assembly efficiency.

[0011] Furthermore, the I-beam bracket and the support platform are positioned using pins and holes to ensure installation accuracy; an external rotor motor is mounted on the I-beam bracket; the stator of the external rotor motor is fixed to the I-beam bracket, and an inner ring support shaft is fixed to the stator; an outer ring support cylinder is sleeved on the outside of the inner ring support shaft; the outer ring support cylinder and the rotor of the external rotor motor are fixedly connected; the bearing to be tested is installed between the inner ring support shaft and the outer ring support cylinder; the inner ring of the bearing is fixedly connected to the inner ring support shaft, and the outer ring of the bearing is fixedly connected to the outer ring support cylinder; a laser vibration measurement head is fixed to the upper end of the inner ring support shaft.

[0012] Furthermore, the mounting plate installed on the crossbeam is threadedly connected to the mounting plate by long bolts that pass through the crossbeam and the connecting plate from top to bottom; so that when the vacuum hood is disassembled later, only the long bolts at the top need to be turned, without having to insert a screwdriver between the vacuum hood and the connecting plate for disassembly, thus facilitating the removal of the upper connecting plate.

[0013] Furthermore, a vacuum suction port is provided below the vacuum hood; the vacuum suction port is located on the support platform.

[0014] Furthermore, a sealing valve and a vacuum pressure gauge are installed on the lower end face of the support platform.

[0015] Furthermore, the sealing valve selected is the KF25 baffle valve.

[0016] The beneficial effects are:

[0017] 1. The support frame has a rectangular shape, which allows the entire assembly of the workpiece to be inverted or laid flat after assembly to simulate the working conditions of a bearing during operation, making the test more accurate. At the same time, the external laser detection head prevents vibration from loosening, improving vibration measurement accuracy.

[0018] 2. The staggered distribution of mounting holes and mating holes makes assembly convenient. Simply align any column and any beam, and screw the bolts in through the corresponding mounting holes. This avoids the problem of complicated installation caused by inconsistent specifications, enables blind selection installation, and improves assembly efficiency.

[0019] 3. The mounting plate installed on the crossbeam is connected to the mounting plate by long bolts that pass through the crossbeam and the connecting plate from top to bottom; so that when the vacuum hood is disassembled later, only the long bolts at the top need to be turned, without having to insert a screwdriver between the vacuum hood and the connecting plate for disassembly, thus facilitating the removal of the upper connecting plate.

[0020] 4. The bolts press the laser detection head into the placement hole, which serves to center and stabilize it. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of a bearing assembly vibration measuring fixture according to the present invention;

[0023] Figure 2 This is a front view of an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of removing the vacuum cover according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the mounting plate and laser detection head according to an embodiment of the present invention.

[0026] In the diagram: 100, column; 200, beam; 300, support platform; 400, I-beam bracket; 500, vacuum hood; 600, sealing valve; 710, mounting plate; 720, laser detection head; 730, laser vibration irradiation head; 740, outer ring support cylinder. Detailed Implementation

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. All electrical components mentioned in this document are electrically connected to an external main controller and 220V AC mains power, and the main controller can be a conventionally known device such as a computer that provides control.

[0028] An embodiment of the bearing assembly vibration measuring fixture of this utility model is as follows: Figures 1 to 4 As shown, it includes a bracket, a support platform, a vacuum chamber, and a vibration measurement assembly;

[0029] The support frame consists of four uprights and eight crossbeams. The uprights are vertically arranged in a ring. Each group of four crossbeams forms a rectangular frame. Two groups of crossbeams are located at the top and bottom of each upright. The four uprights and eight crossbeams form a cuboid frame structure. The uprights and adjacent crossbeams are fixedly connected by screws for easy disassembly. Each upright has two sets of mounting holes at both ends, each set containing two holes. These two sets of mounting holes are located on adjacent vertical sidewalls of the uprights. The two sets of mounting holes are staggered vertically and perpendicular to each other. Each crossbeam also has two sets of threaded holes on its vertical endwalls, each set containing two holes. These threaded holes are staggered vertically and parallel to each other. This staggered arrangement of mounting holes and mating holes facilitates assembly by simply aligning any upright and any crossbeam and screwing in the corresponding mounting hole, avoiding installation complexities caused by inconsistent specifications, enabling blind installation and improving assembly efficiency.

[0030] The support platform is positioned between four columns; the support platform and columns are fixedly connected by bolts; an I-beam bracket is fixed at the center of the support platform; the I-beam bracket and support platform are positioned by pins and holes to ensure installation accuracy; an external rotor motor (not shown in the figure) is mounted on the I-beam bracket; the stator of the external rotor motor is fixed to the I-beam bracket, and an inner ring support shaft is fixed to the stator; an outer ring support cylinder is fitted around the outer side of the inner ring support shaft; the outer ring support cylinder is fixedly connected to the rotor of the external rotor motor; the bearing to be tested is installed between the inner ring support shaft and the outer ring support cylinder; the inner ring of the bearing is fixedly connected to the inner ring support shaft, and the outer ring of the bearing is fixedly connected to the outer ring support cylinder; a laser vibration measuring head is fixed to the upper end of the inner ring support shaft.

[0031] The vacuum hood is fitted with its opening facing downwards on the outside of the I-beam bracket, with its lower end sealing against the support platform; a vacuum suction port is provided below the vacuum hood; the vacuum suction port is located on the support platform; a sealing valve and a vacuum pressure gauge are installed on the lower end face of the support platform; the sealing valve is a KF25 baffle valve.

[0032] The vibration measurement assembly consists of three components, each including a mounting plate. Two of the mounting plates are fixed to adjacent columns, while the remaining mounting plate is fixed to the upper crossbeam via a connecting plate. The mounting plate has arc-shaped placement holes containing laser detection heads. Laser light is emitted from these holes onto the target object. Two bolts are threaded onto the mounting plate, pressing the laser detection head into the placement holes for centering and stability. The laser detection heads of the three vibration measurement components correspond to the x, y, and z directions of the orthogonal coordinate axes being measured. The mounting plate on the crossbeam is threadedly connected to the mounting plate via long bolts that pass through the crossbeam and connecting plate from top to bottom. This allows for easy removal of the upper connecting plate during subsequent disassembly of the vacuum chamber by simply turning the long bolts at the top, eliminating the need to insert a screwdriver between the vacuum chamber and the connecting plate. The support has a rectangular frame structure, allowing the entire assembly to be inverted or laid flat after the workpiece is assembled, simulating the operating conditions of a bearing in its upright, inverted, and flat positions, thus improving testing accuracy. Meanwhile, the external laser detection head avoids vibration and loosening, improving the accuracy of vibration measurement.

[0033] Based on the above embodiments, the working principle and process of this utility model are as follows: the outer ring support cylinder and the rotor of the outer rotor motor are fixedly connected; the bearing to be tested is installed between the inner ring support shaft and the outer ring support cylinder; the inner ring of the bearing and the inner ring support shaft are fixedly connected, and the outer ring of the bearing and the outer ring support cylinder are fixedly connected; as needed, after assembling the workpiece to be tested, the whole assembly is inverted or laid flat to simulate the working conditions of the bearing during operation in upright, inverted, and flat positions, making the test more accurate. When disassembling the vacuum cover later, only the long bolt at the top needs to be turned; there is no need to insert a screwdriver between the vacuum cover and the connecting plate for disassembly, thus facilitating the removal of the upper connecting plate.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearing assembly vibration measurement tool, characterized by: Includes brackets, support platforms, vacuum chambers, and vibration measurement components; The support structure consists of four uprights and eight crossbeams. The uprights are vertically arranged and distributed in a ring. The eight crossbeams are arranged in groups of four, with each group forming a rectangular frame. Two groups of crossbeams are located at the top and bottom of the uprights. The four uprights and eight crossbeams form a cuboid frame structure. The uprights and adjacent crossbeams are fixedly connected. The support platform is located between the four columns; the support platform and the columns are fixedly connected; an I-beam bracket is fixed at the center of the support platform. The vacuum hood is fitted onto the outside of the I-beam bracket with its opening facing downwards, and its lower end is sealed and abuts against the support platform; There are three vibration measurement components; each vibration measurement component includes a mounting plate; the mounting plates of two vibration measurement components are fixed to adjacent columns, and the mounting plate of the remaining vibration measurement component is fixed to the upper crossbeam through a connecting plate; the mounting plate has an arc-shaped placement hole; a laser detection head is installed in the placement hole; two bolts are threadedly connected to the mounting plate; the bolts press the laser detection head into the placement hole.

2. The bearing assembly vibration measurement tool of claim 1, wherein: The column and the adjacent crossbeam are fixedly connected by screws; each end of the column has two sets of mounting holes; each set contains two mounting holes; the two sets of mounting holes are opened on the adjacent vertical sidewalls of the column; the two sets of mounting holes are staggered vertically and the axes of the two sets of mounting holes are perpendicular; each end of the crossbeam has two sets of threaded holes on the vertical endwalls; each set contains two threaded holes; the two sets of threaded holes are staggered vertically and the axes of the two sets of threaded holes are parallel.

3. The bearing assembly vibration measurement tool of claim 1, wherein: The I-beam support and the support platform are positioned by pins and holes; an outer rotor motor is mounted on the I-beam support; the stator of the outer rotor motor is fixed on the I-beam support, and an inner ring support shaft is fixed on the stator; an outer ring support cylinder is sleeved on the outside of the inner ring support shaft; the outer ring support cylinder and the rotor of the outer rotor motor are fixedly connected; the bearing to be tested is installed between the inner ring support shaft and the outer ring support cylinder; the inner ring of the bearing is fixedly connected to the inner ring support shaft, and the outer ring of the bearing is fixedly connected to the outer ring support cylinder; a laser vibration measurement head is fixed at the upper end of the inner ring support shaft.

4. The bearing assembly vibration measurement tool of claim 1, wherein: The mounting plate, which is installed on the crossbeam, is connected to the mounting plate by long bolts that run from top to bottom through the crossbeam and the connecting plate.

5. The bearing assembly vibration measurement tool of claim 1, wherein: A vacuum suction port is located below the vacuum hood; the vacuum suction port is located on the support platform.

6. The bearing assembly vibration measurement tool of claim 5, wherein: A sealing valve and a vacuum gauge are installed on the lower end face of the support platform.

7. The bearing assembly vibration measurement tool of claim 6, wherein: The sealing valve is a KF25 baffle valve.

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