Fault bearing test platform

Abstract

A fault bearing test platform disclosed by the present invention comprises a signal acquisition device which comprises a bottom plate, and a force application driver, a bearing installation seat and a rotation driver which are sequentially arranged on the bottom plate, the bearing installation seat comprises an outer ring seat and an inner ring seat which are coaxially sleeved from outside to inside, and a fault bearing is installed between the outer ring seat and the inner ring seat; the outer ring seat is rotatably arranged, the driving end of the rotary driver is connected with the outer ring seat and is used for driving the outer ring seat to rotate, the driving end of the force application driver is coaxially connected with the inner ring seat and is used for applying an axial load to a fault bearing, and a sensor is arranged in the inner ring seat. The fault bearing test platform can simulate the real use condition of a fault bearing, can provide effective data support for a bearing diagnosis algorithm, and also can verify the reliability of a sensor and a cable thereof under the real use condition.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and more specifically, to a fault bearing test platform. Background Art

[0002] Bearing faults are key factors affecting the lifespan of mechanical rotating components. During long-term rotational motion of bearings, faults may occur in the inner ring, outer ring, rollers, and cage. In the early stage of the fault, the impact may be small and difficult to detect. However, once it develops to the middle and late stages of the fault, it will seriously affect the safety of mechanical rotating components. Therefore, generally, sensors are installed on the fixed parts of the bearings to monitor their vibration, shock, and temperature signals, and the health of the bearings is monitored through diagnostic algorithms.

[0003] To obtain the signal characteristics of bearings in different health states, signal acquisition devices are generally used for analog acquisition. That is, the fault bearing is installed on the signal acquisition device, and the signal acquisition device drives the inner ring of the fault bearing to rotate to simulate the bearing usage conditions, and the sensors are installed on the fixed parts of the bearing outer ring to obtain the vibration, shock, and temperature signals of the fault bearing to provide effective data support for the bearing diagnostic algorithm.

[0004] In the process of implementing the present invention, the inventor found that the existing signal acquisition devices have at least the following problems:

[0005] First, most existing signal acquisition devices use the method of inner ring rotation and non-rotation of the outer ring. Although it is convenient for laboratory use, it cannot achieve the fixed inner ring and rotating outer ring of the bearing, which is different from the actual usage conditions of the bearing.

[0006] Second, when the fault bearing is working in reality, it will be subjected to a large axial load in the axial direction. The existing signal acquisition devices cannot simulate the application of the axial load on the bearing, which is different from the actual usage conditions of the bearing.

[0007] Third, in some cases, when the bearing is working in reality, the bearing will undergo axial movement. It is not difficult to understand that when the sensor is installed on the bearing fixed part, the axial movement of the bearing will drive the movement of the sensor and its cable. The existing signal acquisition devices cannot simulate the axial movement of the bearing, which is different from the actual usage conditions of the bearing.

[0008] In summary, the existing signal acquisition devices cannot simulate the actual usage conditions of the fault bearing, and thus cannot provide effective data support for the bearing diagnostic algorithm, nor can they verify the reliability of the sensor and its cable under actual usage conditions.

[0009] Therefore, how to simulate the actual usage conditions of the fault bearing is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0010] In view of this, the object of the present invention is to provide a faulty bearing test platform, which can simulate the actual working conditions of a faulty bearing, provide effective data support for bearing diagnosis algorithms, and also verify the reliability of sensors and their cables under actual working conditions.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A faulty bearing test platform includes a signal acquisition device. The signal acquisition device includes a bottom plate, and a force application driver, a bearing mounting seat, and a rotation driver sequentially arranged on the bottom plate. Among them, the bearing mounting seat includes an outer ring seat and an inner ring seat coaxially sleeved from the outside to the inside. A faulty bearing is installed between the two, and the outer ring seat is rotatably arranged. The driving end of the rotation driver is connected to the outer ring seat to drive the outer ring seat to rotate. The driving end of the force application driver is coaxially connected to the inner ring seat to apply an axial load to the faulty bearing. A sensor is arranged inside the inner ring seat to collect data during the operation of the faulty bearing and transmit it to a monitoring device through a cable.

[0013] Preferably, a slide rail is arranged on the bottom plate between the force application driver and the bearing mounting seat. The slide rail is provided with a dovetail groove extending along the axial direction of the bearing mounting seat. A dovetail groove slider that can slide along it is arranged in the dovetail groove, and the dovetail groove slider is connected to the driving end of the force application driver and the inner ring seat.

[0014] Preferably, an outer ring cover plate is arranged at one end of the outer ring seat facing the rotation driver, and a convex shaft coaxial with the outer ring seat is arranged on the end face of the outer ring cover plate facing away from the outer ring seat. The convex shaft is rotatably fixed on a first bracket on the bottom plate through an auxiliary bearing.

[0015] Preferably, the force application driver is arranged on the bottom plate through a second bracket, and a pull plate is arranged between the first bracket and the second bracket.

[0016] Preferably, the driving end of the rotation driver is connected to the convex shaft through a universal joint.

[0017] Preferably, the rotation driver is a speed control motor, and the speed control motor is connected to a frequency modulation device.

[0018] Preferably, one end of the inner ring seat facing away from the rotation driver is connected to a platform located outside the outer ring seat.

[0019] Preferably, one end of the platform facing away from the inner ring seat is connected to a convex platform, and an opening is arranged on the convex platform. An atomizing nozzle for communicating with a lubricating oil supply device is inserted into the opening.

[0020] Preferably, an axial driving device is further included, wherein the axial driving device includes a displacement driver, and the driving end of the displacement driver is coaxially connected to the force driver for driving the faulty bearing to perform axial reciprocating motion.

[0021] Preferably, the axial drive device also includes a first support member, a pull rod head and a straight rod assembly, the first support member and the base plate can be slidably arranged on a guide rail extending axially along the bearing mounting seat in turn, the pull rod head is arranged at the top end of the first support member, and one end of the pull rod head is connected to the force driver through the straight rod assembly, and the other end of the pull rod head is connected to the driving end of the displacement driver.

[0022] Preferably, the guide rail is also provided with a second support member that can slide along it, the second support member is located between the first support member and the force driver and is connected to the straight rod assembly, and the straight rod assembly is provided with a wiring channel, and the cable connected to the sensor is fixed to the drag chain on the first support member through the wiring channel.

[0023] Preferably, the displacement driver is a linear motor, the linear motor is transmission-connected to a rack, the rack and the straight rod assembly are coaxially arranged, one end of the rack is provided with a lifting ring extending into the interior of the pull rod head, and the bolt passes through the top end of the first support member, the bottom end of the pull rod head, the lifting ring and the top end of the pull rod head in sequence and is fixed by a locking nut.

[0024] When the faulty bearing test platform provided by the present invention is used, the faulty bearing is installed between the outer ring seat and the inner ring seat, and the rotary driver drives the outer ring seat to rotate, which can simulate the actual use condition of the faulty bearing with the inner ring fixed and the outer ring moving. At the same time, the driving end of the force driver moves toward the inner ring seat, and the inner ring seat will have an axial movement trend. The outer ring seat can only be rotatably set on the bottom plate and will not move axially. The axial load of the force driver acts on the faulty bearing, which can simulate the actual use condition that the faulty bearing will be subjected to the axial load. In addition, the driving end of the displacement driver pushes the force driver in the axial direction to drive the bottom plate to reciprocate. Since the bearing mounting seat for mounting the faulty bearing is set on the bottom plate, and the force driver and the bearing mounting seat (inner ring seat and outer ring seat) are coaxial, the faulty bearing can be driven to reciprocate axially, simulating the actual use condition of the faulty bearing with axial movement. Moreover, the sensor is installed on the inner ring seat, and the inner ring seat moves axially with the faulty bearing, which can verify the reliability of the sensor and its cable under the actual use condition.

[0025] In summary, the fault bearing test platform provided by the present invention can simulate the actual working conditions of a fault bearing, that is, it can achieve the working conditions such as fixing the inner ring of the fault bearing, rotating the outer ring, applying axial load to the bearing, and reciprocating axial movement. The overall working conditions are closer to the actual working conditions, effectively improving the accuracy of sensor signal acquisition, providing effective data support for the bearing diagnosis algorithm, and also verifying the reliability of the sensor and its cable under actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0027] Figure 1 is a schematic structural diagram of a fault bearing test platform provided by the present invention;

[0028] Figure 2 is an exploded view of the bearing mounting seat provided by the present invention;

[0029] Figure 3 is a schematic structural diagram of the bearing mounting seat provided by the present invention;

[0030] Figure 4 is a schematic structural diagram of the signal acquisition device provided by the present invention;

[0031] Figure 5 is a partial schematic structural diagram of the axial drive device provided by the present invention.

[0032] Reference numerals:

[0033] 1 - guide rail;

[0034] 2 - signal acquisition device; 21 - bottom plate; 211 - first slider; 22 - force application driver; 23 - bearing mounting seat; 231 - outer ring seat; 232 - inner ring seat; 233 - outer ring cover plate; 234 - convex shaft; 235 - auxiliary bearing; 24 - rotation driver; 25 - sensor; 251 - axial composite sensor; 252 - radial composite sensor; 26 - dovetail groove slider; 27 - first bracket; 28 - second bracket; 29 - pull plate; 210 - universal joint; 212 - mounting seat; 213 - platform; 214 - opening;

[0035] 3 - Axial drive device; 31 - Displacement driver; 32 - First support; 321 - Second slider; 33 - Tie rod head; 34 - Straight rod assembly; 341 - Joystick; 342 - Tie rod; 35 - Second support; 351 - Third slider; 36 - Rack; 361 - Hoop; 37 - Bolt; 38 - Locking nut; 39 - Drag chain; 310 - Mounting bracket;

[0036] 4 - Faulty bearing. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The core of the present invention is to provide a faulty bearing test platform, which can simulate the actual working conditions of faulty bearings, provide effective data support for bearing diagnosis algorithms, and also verify the reliability of sensors and their cables under actual working conditions.

[0039] It should be noted that in this embodiment, the orientation or positional relationship indicated by "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0040] Please refer to Figure 1 , the present invention provides a faulty bearing test platform, including a signal acquisition device 2. The signal acquisition device 2 includes a bottom plate 21, and a force application driver 22, a bearing mounting seat 23, and a rotation driver 24 sequentially arranged on the bottom plate 21. Among them, the bearing mounting seat 23 includes an outer ring seat 231 and an inner ring seat 232 coaxially sleeved from the outside to the inside. A faulty bearing 4 is installed between them, and the outer ring seat 231 is rotatably arranged. The driving end of the rotation driver 24 is connected to the outer ring seat 231 to drive the outer ring seat 231 to rotate. The driving end of the force application driver 22 is coaxially connected to the inner ring seat 232 to apply an axial load to the faulty bearing 4. A sensor 25 is arranged inside the inner ring seat 232 to collect data during the operation of the faulty bearing 4 and transmit it to the monitoring device through a cable.

[0041] Specifically, asFigures 2 to 4 As shown, the force application driver 22, the bearing mounting seat 23, and the rotation driver 24 can be arranged in sequence along the length direction of the bottom plate 21. The bearing mounting seat 23 is used for fixedly mounting the faulty bearing 4, which includes an outer ring seat 231 and an inner ring seat 232. The outer ring seat 231 is rotatably fixed on the bottom plate 21. The inner ring seat 232 is sleeved into the outer ring seat 231 and is coaxial with the outer ring seat 231. And there is a radial gap between the inner ring seat 232 and the outer ring seat 231. The faulty bearing 4 is placed in this gap and is interference-fitted with the outer ring seat 231 and the inner ring seat 232 to tightly hold it, thus completing the assembly of the faulty bearing 4.

[0042] The driving end of the rotation driver 24 is connected to one end of the outer ring seat 231 facing away from the force application driver 22. Starting the rotation driver 24 can drive the outer ring seat 231 to rotate, and further realize the working condition of the outer ring of the bearing moving and the inner ring fixed. Preferably, the driving end of the rotation driver 24 is coaxial with the outer ring seat 231, which can enhance the transmission efficiency, reduce wear, and improve the operation stability.

[0043] The driving end of the force application driver 22 is connected to one end of the inner ring seat 232 facing away from the rotation driver 24. Starting the force application driver 22, its driving end can move towards the inner ring seat 232. The inner ring seat 232 will have an axial movement tendency. Since the outer ring seat 231 is only rotatably arranged on the bottom plate 21 and will not have axial movement, the axial load of the force application driver 22 acts on the faulty bearing 4, which can simulate the real working condition in which the faulty bearing 4 will be subjected to axial load.

[0044] The inner ring seat 232 does not make rotational movement. The sensor 25 is arranged inside the inner ring seat 232, which can effectively improve the stability and reliability of the sensor 25 and its cable. The sensor 25 includes an axial composite sensor 251 and a radial composite sensor 252. The axial composite sensor 251 is used to collect the vibration, impact, and temperature data in the axial direction of the faulty bearing 4, and the radial composite sensor 252 is used to collect the vibration, impact, and temperature data in the radial direction of the faulty bearing 4 to ensure the accuracy of the data collection of the faulty bearing 4. In addition, it should be noted that the sensor 25 is connected with a cable, and the cable can transmit the data signal collected by the sensor 25 to the monitoring device for processing and analysis.

[0045] In summary, the faulty bearing test platform provided by the present invention can simulate the real working condition of the faulty bearing 4, that is, realize the working conditions such as the inner ring of the faulty bearing 4 being fixed, the outer ring rotating, and the axial load of the bearing. The overall working condition is closer to the real working condition, effectively improving the accuracy of the signal collection of the sensor 25, providing effective data support for the bearing diagnosis algorithm, and also verifying the reliability of the sensor 25 and its cable under the real working condition.

[0046] In addition, it should be noted that the fault bearing test platform provided by the present invention can not only collect vibration, impact, and temperature data during the operation of the known fault bearing 4, providing effective data support for the bearing fault diagnosis algorithm, but also collect data of the unknown fault bearing 4, disassemble the bearing after diagnosing the fault type, and verify the accuracy of the bearing fault diagnosis algorithm.

[0047] Considering the specific connection method between the force application driver 22 and the inner ring seat 232, on the basis of the above embodiment, please refer to Figure 4 , a slide rail is provided on the bottom plate 21 between the force application driver 22 and the bearing mounting seat 23. The slide rail is provided with a dovetail groove extending along the axial direction of the bearing mounting seat 23. A dovetail groove slider 26 that can slide along it is provided in the dovetail groove, and the dovetail groove slider 26 connects the driving end of the force application driver 22 and the inner ring seat 232.

[0048] Specifically, the slide rail is provided on the bottom plate 21 and is located between the force application driver 22 and the bearing mounting seat 23. A dovetail groove is provided on the slide rail, and a slidable dovetail groove slider 26 is inserted in the dovetail groove. The dovetail groove extends along the axial direction of the axial mounting seat 212, enabling the dovetail groove slider 26 to move axially along the inner ring seat 232. One end of the dovetail groove slider 26 is connected to the driving end of the force application driver 22, and the other end is connected to the inner ring seat 232. In this way, the driving end of the force application driver 22 pushes the dovetail groove slider 26 to move axially towards the inner ring seat 232 along the inner ring seat 232, and the inner ring seat 232 has an axial movement tendency, realizing the application of axial load to the fault bearing 4. The design of the above-mentioned sliding fit guide rail 1 and dovetail groove slider 26 has the characteristics of being able to bear greater loads, smooth sliding, and accurate positioning. Therefore, the force application driver 22 can accurately and smoothly apply axial load to the inner ring seat 232 through the dovetail groove slider 26.

[0049] In a specific embodiment, the force application driver 22 is a cylinder. A screw hole is provided at one end of the dovetail groove slider 26 adjacent to the cylinder, and the piston rod of the cylinder is connected to the screw hole to realize the connection between the cylinder and the dovetail groove slider 26. In this way, when high-pressure gas is input into the cylinder, the piston rod pushes the dovetail groove slider 26 to move towards the inner ring seat 232, and the application of axial load to the fault bearing 4 can be realized. Of course, the force application driver 22 can also adopt a hydraulic cylinder or other thrust elements to achieve the above functions.

[0050] Considering the specific setting of the outer ring seat 231 on the bottom plate 21, on the basis of the above embodiment, please refer to Figure 2 and Figure 4 , an outer ring cover plate 233 is provided at one end of the outer ring seat 231 facing the rotation driver 24, and a convex shaft 234 coaxial with the outer ring seat 231 is provided on the end face of the outer ring cover plate 233 facing away from the outer ring seat 231. The convex shaft 234 is rotatably fixed on the first bracket 27 on the bottom plate 21 through an auxiliary bearing 235.

[0051] In the above structure, the outer ring cover plate 233 is rotatably arranged on the auxiliary bearing 235 on the first bracket 27 through the convex shaft 234, and the outer ring seat 231 is connected to the outer ring cover plate 233, so that the outer ring seat 231 is rotatably arranged on the bottom plate 21. In addition, when the inner ring seat 232 has an axial movement tendency under the action of the cylinder thrust, since the outer ring seat 231 is connected to the outer ring cover plate 233 and the outer ring cover plate 233 is installed on the first bracket 27, the first bracket 27 can block the axial displacement of the outer ring seat 231 through the outer ring cover plate 233. Therefore, the cylinder thrust can act on the faulty bearing 4 to realize the application of the axial load on the faulty bearing 4.

[0052] It should be noted that since the force application driver 22 applies a large axial load to the faulty bearing 4, when the strength of the bottom plate 21 is insufficient, deformation problems may occur, which will affect the experimental accuracy. In severe cases, it may lead to fracture and cause safety problems.

[0053] To avoid the above problems, on the basis of the above embodiments, please refer to Figure 4 , the force application driver 22 is arranged on the bottom plate 21 through the second bracket 28, and a tension plate 29 is arranged between the first bracket 27 and the second bracket 28.

[0054] Specifically, both the first bracket 27 and the second bracket 28 are fixed on the bottom plate 21 by bolts, and they are arranged at intervals along the axial direction of the inner ring seat 232 (that is, along the axial direction of the outer ring seat 231 and the driving end of the force application driver 22). The force application driver 22 is installed on the second bracket 28, and the bearing mounting seat 23 is installed on the first bracket 27. The tension plate 29 is connected between the two sides of the first bracket 27 and the second bracket 28. In this way, the tension plate 29 can share the force on the bottom plate 21, ensure that the overall force deformation of the signal acquisition device 2 is controllable, and does not affect the experimental results. Of course, when the strength of the bottom plate 21 is sufficient and there is no deformation, the tension plate 29 can be not used.

[0055] To simulate the operating conditions of the bearing at different speeds, on the basis of the above embodiments, the rotation driver 24 is a speed-regulating motor, and the speed-regulating motor is connected to a frequency modulator.

[0056] Specifically, the rotation driver 24 is a driving component for the movement of the faulty bearing 4. The rotation driver 24 can adopt adjustable-speed motor types such as three-phase motors or variable-frequency motors. The frequency modulator is used to adjust the speed of the speed-regulating motor, so as to realize the adjustment of the speed of the faulty bearing 4 and simulate the operating conditions of the bearing at different speeds.

[0057] In a specific embodiment, a speed sensor is arranged on the first bracket 27 to monitor the speed of the faulty bearing 4 in real time and transmit the signal to the monitoring device, so that the monitoring device can accurately control the speed of the rotation driver 24 (that is, the speed of the faulty bearing 4) according to the acquired signal.

[0058] To solve the problem of concentric error between the output shaft of the speed control motor and the rotating shaft of the outer ring seat 231 caused by assembly, on the basis of the above embodiment, the output shaft of the speed control motor is connected to the convex shaft 234 through the universal joint 210.

[0059] Optionally, the speed control motor is arranged on the bottom plate 21 through the mounting seat 212. On the one hand, it can increase the mounting height of the speed control motor to ensure the coaxial connection between the speed control motor and the convex shaft 234. On the other hand, it provides stable support for the speed control motor to ensure its stable operation under various working conditions.

[0060] On the basis of the above embodiment, please refer to Figure 4 , one end of the inner ring seat 232 facing away from the rotary drive 24 is connected to the platform 213 located outside the outer ring seat 231, and other types of sensors can be pre-installed on the platform 213.

[0061] When the bearing is working in reality, it will be lubricated with oil. To simulate this working condition, on the basis of the above embodiment, please refer to Figure 4 , one end of the platform 213 facing away from the inner ring seat 232 is connected to a convex platform, and an opening 214 is provided on the convex platform. The opening 214 is inserted with an atomizing nozzle for communicating with the lubricating oil supply device. It should be noted that the convex platform, the platform 213 and the interior of the inner ring seat 232 are sequentially connected. In this way, the atomizing nozzle is connected to the liquid outlet end of the external lubricating oil supply device through a pipeline. The atomizing nozzle atomizes the lubricating oil to form a very small diameter liquid mist, and then sprays it into the inner ring seat 232, and then lubricates the faulty bearing 4.

[0062] To simulate the influence on the faulty bearing 4 during the reciprocating motion and commutation process, on the basis of any of the above embodiments, the present invention further includes an axial driving device 3. The axial driving device 3 includes a displacement driver 31, and the driving end of the displacement driver 31 is coaxially connected to the force application driver 22 for driving the faulty bearing 4 to perform axial reciprocating motion.

[0063] Specifically, as Figure 1 shown, the driving end of the displacement driver 31 is coaxially connected to the force application driver 22. The driving end of the displacement driver 31 can drive the force application driver 22 to reciprocate axially through telescopic motion. Since the displacement driver 31 and the bearing mounting seat 23 are both installed on the bottom plate 21, and the force application driver 22 and the bearing mounting seat 23 (inner ring seat 232 and outer ring seat 231) are coaxial, the faulty bearing 4 can be driven to perform axial reciprocating motion, simulating the special actual use condition of the helicopter tail rotor control rod driving the faulty bearing to perform reciprocating motion. Moreover, the sensor 25 is installed in the inner ring seat 232, and the inner ring seat 232 reciprocates axially with the faulty bearing 4, which can verify the reliability of the sensor 25 and its cable under the actual use condition.

[0064] To improve the accuracy and stability of the axial reciprocating motion of the faulty bearing 4, based on the above embodiments, please refer to Figure 1 and Figure 5 , the axial drive device 3 further includes a first support member 32, a pull rod head 33 and a straight rod assembly 34. The first support member 32 and the bottom plate 21 are sequentially slidably disposed on the guide rail 1 extending along the axis of the bearing mounting seat 23. The pull rod head 33 is disposed at the top end of the first support member 32, and one end of the pull rod head 33 is connected to the force application driver 22 through the straight rod assembly 34, and the other end of the pull rod head 33 is connected to the drive end of the displacement driver 31.

[0065] Specifically, a first slider 211 is provided at the bottom end of the bottom plate 21, and the first slider 211 is slidably mounted on the guide rail 1. A second slider 321 is provided at the bottom end of the first support member 32, and the second slider 321 is mounted on the guide rail 1, so that the bottom plate 21 and the first support member 32 are slidably mounted on the guide rail 1. The guide rail 1 is arranged along the axis of the bearing mounting seat 23. Since the guide rail 1 has the characteristics of high load-bearing capacity, low friction and high-precision positioning, the accuracy and stability of the axial reciprocating motion of the faulty bearing 4 can be improved. In addition, a pull rod head 33 is provided at the top end of the first support member 32, and the displacement driver 31 is disposed on one side of the end of the guide rail 1. The drive end of the displacement driver 31 is connected to the force application driver 22 through the straight rod assembly 34. Since the displacement driver 31 is coaxial with the bearing mounting seat 23, it is not difficult to imagine that the straight line assembly is arranged along the axis of the bearing mounting seat 23. The straight line assembly can not only accurately control the bottom plate 21 to move linearly along the axis of the bearing mounting seat 23, but also bear a large thrust to stably and reliably push the signal acquisition device 2 to perform axial reciprocating motion, further improving the accuracy and stability of the axial reciprocating motion of the faulty bearing 4.

[0066] Preferably, the guide rail 1 is provided with two guide rails, and the two guide rails 1 are arranged at intervals and in parallel, which can better improve the accuracy and stability of the axial reciprocating motion of the faulty bearing 4.

[0067] Furthermore, please refer to Figure 1 and Figure 5 , a second support member 35 slidable along the guide rail 1 is further provided on the guide rail 1. The second support member 35 is located between the first support member 32 and the force application driver 22 and is connected to the straight rod assembly 34, and the straight rod assembly 34 is provided with a wire routing channel. The cable connected to the sensor 25 is fixed on the drag chain 39 on the first support member 32 through the wire routing channel.

[0068] It is understandable that the straight rod assembly 34 is used to connect the displacement driver 31 and the force driver 22. It has a relatively long length. Adding a second support member 35 to support the straight rod assembly 34 can enhance the structural stability of the straight rod assembly 34, which is beneficial to improving the smooth linear reciprocating movement of the signal acquisition device 2. Furthermore, the straight rod assembly 34 has a relatively long length, and the internal space of the straight rod assembly 34 can be used as a wiring channel, so that the cable connected to the sensor 25 is fixed to the drag chain 39 on the first support member 32 through the wiring channel, and the cable can be hidden, making the line layout beautiful and saving space. Of course, the cable connected to the sensor 25 can also adopt other routing methods, such as using a clamp to fix the cable to the straight rod assembly 34. The routing method is not unique and can be performed according to actual working conditions.

[0069] In a specific embodiment, please refer to Figure 1 The straight rod assembly 34 includes an operating rod 341 and a pull rod 342, both of which are cylindrical structures. One end of the operating rod 341 is screwed into the pull rod head 33 and threadedly matched therewith. The other end of the operating rod 341 is fixed to one end of the second support member 35 by bolts. One end of the pull rod 342 is fixed to the other end of the second support member 35 by bolts. The other end of the pull rod 342 is fixed to the force driver 22 by bolts, thereby connecting the straight rod assembly 34 between the pull rod head 33 and the force driver 22. The above-mentioned straight rod assembly 34 is composed of a split operating rod and a pull rod 342, which is convenient for manufacturing, processing and disassembly.

[0070] Considering the specific connection mode between the driving end of the displacement driver 31 and the pull rod head 33, based on the above embodiment, please refer to Figure 5 The displacement driver 31 is a linear motor, which is connected to the rack 36 through transmission. The rack 36 and the straight rod assembly 34 are coaxially arranged. One end of the rack 36 is provided with a ring 361 extending into the interior of the tie rod head 33. The bolt 37 passes through the top of the first support member 32, the bottom of the tie rod head 33, the ring 361 and the top of the tie rod head 33 in sequence and is fixed by a locking nut 38. In this way, the linear motor directly generates linear motion to realize power transmission, and does not need to be converted into linear motion through traditional rotational motion. The straight rod assembly 34 is pushed back and forth in the axial direction by connecting the tie rod head 33 through the rack 36, which has a more compact structure and higher efficiency.

[0071] Since the length of the rack 36 and the guide rail 1 is limited, in order to prevent the sliders on the rack 36 and the guide rail 1 from falling off, on the basis of the above embodiment, the workbench is provided with a position sensor at the limit position corresponding to the joystick 341. When the second slider 321 on the first support member 32 hits the position sensor, the position sensor excitation signal is fed back to the electric control box or monitoring equipment to control the commutation of the linear motor. Of course, the commutation can also be controlled by a program, and the commutation time can be set.

[0072] Optionally, a speed governor is also connected to the linear motor, and the speed governor controls its speed by adjusting the voltage of the linear motor.

[0073] To facilitate the operator to operate the test platform, on the basis of the above embodiments, the present invention further includes a workbench. The guide rail 1 is arranged on the workbench along the axial direction of the bearing mounting seat 23, and the displacement driver 31 is arranged on the workbench through the mounting bracket 310 to ensure that the rack 36 and the straight rod assembly 34 are coaxial.

[0074] In summary, the fault bearing test platform provided by the present invention has the following functions:

[0075] First, the vibration, impact, and temperature data during the operation of the fault bearing 4 are accurately collected by the sensor 25, providing effective data support for the bearing diagnosis algorithm.

[0076] Second, by adjusting the thrust of the force application driver 22 (i.e., the cylinder pressure), the axial operating conditions of the fault bearing 4 under different axial loads can be simulated.

[0077] Third, by adjusting the rotational speed of the rotation driver 24, the operating conditions of the fault bearing 4 at different rotational speeds can be simulated.

[0078] Fourth, the straight rod assembly 34 is driven by the displacement driver 31 to perform axial reciprocating motion, simulating the special operating condition that the helicopter tail rotor control rod drives the fault bearing 4 to perform reciprocating motion, and can simultaneously verify the reliability of the sensor 25 and its cable under the real operating conditions.

[0079] Therefore, the present invention can simulate the real usage conditions of the fault bearing 4 and the sensor in a laboratory environment. The finally obtained data is closer to the real operating data. By replacing the bearings with different faults and collecting the data of various fault bearings 4, it can provide effective data support for the bearing diagnosis algorithm, and the axial driving device 3 is introduced to simulate the influence on the fault bearing 4 during the reciprocating motion and the commutation process, and simultaneously verify the reliability of the sensor and its cable at the real operating condition end.

[0080] It should be noted that in this specification, "first", "second", "third", and "fourth" are only used to describe the effects and cannot be understood as indicating or implying relative importance.

[0081] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0082] The above has introduced in detail a fault bearing test platform provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A fault bearing testing platform, characterized in that: The invention comprises a signal acquisition device (2), wherein the signal acquisition device (2) comprises a base plate (21) and a force driver (22), a bearing mounting seat (23) and a rotation driver (24) which are sequentially arranged on the base plate (21), wherein the bearing mounting seat (23) comprises an outer ring seat (231) and an inner ring seat (232) which are coaxially sleeved from the outside to the inside, and a faulty bearing (4) is mounted therebetween, and the outer ring seat (231) is rotatably arranged, a driving end of the rotation driver (24) is connected to the outer ring seat (231) and is used to drive the outer ring seat (231) to rotate, a driving end of the force driver (22) is coaxially connected to the inner ring seat (232) and is used to apply an axial load to the faulty bearing (4), and a sensor (25) is arranged inside the inner ring seat (232) and is used to collect data during the operation of the faulty bearing (4) and transmit the data to a monitoring device via a cable.

2. The fault bearing testing platform according to claim 1, characterized in that: The base plate (21) is provided with a slide rail located between the force driver (22) and the bearing mounting seat (23), the slide rail is provided with a dovetail groove extending along the axial direction of the bearing mounting seat (23), the dovetail groove is provided with a dovetail groove slider (26) that can slide along the dovetail groove, and the dovetail groove slider (26) connects the driving end of the force driver (22) and the inner ring seat (232).

3. The fault bearing testing platform according to claim 1, characterized in that: An outer ring cover plate (233) is provided at one end of the outer ring seat (231) facing the rotary drive (24), and a convex shaft (234) coaxial with the outer ring seat (231) is provided on the end surface of the outer ring cover plate (233) facing away from the outer ring seat (231), and the convex shaft (234) is rotatably fixed to a first bracket (27) on the base plate (21) via an auxiliary bearing (235).

4. The fault bearing testing platform according to claim 2, characterized in that: The force-applying driver (22) is arranged on the bottom plate (21) via a second bracket (28), and a pulling plate (29) is arranged between the first bracket (27) and the second bracket (28).

5. The fault bearing testing platform according to claim 3, characterized in that: The driving end of the rotary driver (24) is connected to the convex shaft (234) via a universal joint (210).

6. The fault bearing testing platform according to claim 1, characterized in that: The rotary driver (24) is a speed regulating motor, and the speed regulating motor is connected to a frequency regulator.

7. The fault bearing testing platform according to claim 1, characterized in that: One end of the inner ring seat (232) facing away from the rotary drive (24) is connected to a platform (213) located outside the outer ring seat (231).

8. The faulty bearing testing platform according to claim 7, characterized in that: One end of the platform (213) facing away from the inner ring seat (232) is connected to a boss, an opening (214) is provided on the boss, and an atomizing nozzle for communicating with a lubricating oil supply device is inserted into the opening (214).

9. The fault bearing testing platform according to any one of claims 1 to 8, characterized in that: It also includes an axial drive device (3), the axial drive device (3) including a displacement driver (31), and the drive end of the displacement driver (31) is coaxially connected to the force driver (22) for driving the faulty bearing (4) to perform axial reciprocating motion.

10. The faulty bearing testing platform according to claim 9, characterized in that: The axial drive device (3) further comprises a first support member (32), a pull rod head (33) and a straight rod assembly (34); the first support member (32) and the base plate (21) are slidably arranged in turn on a guide rail (1) extending axially along the bearing mounting seat (23); the pull rod head (33) is arranged at the top end of the first support member (32), and one end of the pull rod head (33) is connected to the force driver (22) via the straight rod assembly (34), and the other end of the pull rod head (33) is connected to the driving end of the displacement driver (31).

11. The faulty bearing testing platform according to claim 10, characterized in that: The guide rail (1) is also provided with a second support member (35) that can slide along the guide rail, the second support member (35) is located between the first support member (32) and the force driver (22) and is connected to the straight rod assembly (34), and the straight rod assembly (34) is provided with a wiring channel, and the cable connected to the sensor (25) is fixed to the drag chain (39) on the first support member (32) through the wiring channel.

12. The faulty bearing testing platform according to claim 10, characterized in that: The displacement driver (31) is a linear motor, which is connected to a rack (36) for transmission. The rack (36) and the straight rod assembly (34) are coaxially arranged. One end of the rack (36) is provided with a lifting ring (361) extending into the interior of the pull rod head (33). The bolt (37) passes through the top end of the first support member (32), the bottom end of the pull rod head (33), the lifting ring (361) and the top end of the pull rod head (33) in sequence and is fixed by a locking nut (38).

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