Magnetic liquid sliding bearing test bed

Abstract

The utility model belongs to the technical field of bearing testing, and particularly relates to a magnetic liquid sliding bearing test bed which comprises a test table board, a main shaft driving assembly, a supporting assembly, a tested magnetic liquid sliding bearing, a radial loading assembly and a detection assembly. Wherein the main shaft driving assembly comprises a servo motor and a main shaft; the supporting assembly comprises a mounted bearing; the tested magnetic liquid sliding bearing comprises a tile-shaped permanent magnet, a permanent magnet matching ring, a bearing seat and a replaceable bushing. The radial loading assembly comprises a jack for providing loading force for the main shaft; the detection assembly is fused in the above assemblies and is used for detecting various parameters of the tested magnetic liquid sliding bearing in operation; the utility model provides a test bed convenient for detecting lubricating performance parameters such as oil film pressure, oil film temperature and the like for the tested magnetic liquid sliding bearing, the whole device is simple in structure, the parameter acquisition mode is convenient and reliable, and the test bed has far-reaching significance on development of the magnetic liquid sliding bearing.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing testing, and particularly relates to a magnetic fluid sliding bearing test bench. Background Art

[0002] Compared with traditional sliding bearings, magnetic fluid sliding bearings utilize the adjustable characteristics of spatial position and viscosity of magnetic fluid under an external magnetic field, and can provide good lubrication effects under extreme conditions such as heavy loads and high speeds, reducing friction and wear.

[0003] However, there are few reports on magnetic fluid sliding bearing test benches in the existing public materials; the design and construction of magnetic fluid sliding bearing test benches play an important role in deeply researching, evaluating, and developing magnetic fluid sliding bearings, optimizing the load-bearing capacity, load stability ability, and friction characteristics of magnetic fluid sliding bearings, etc., which helps to improve the feasibility and reliability of magnetic fluid sliding bearings in practical applications, and further expands the development and application of magnetic fluid sliding bearings. Summary of the Utility Model

[0004] In view of this, the present application provides a magnetic fluid sliding bearing test bench, aiming to provide a test bench for magnetic fluid sliding bearings that is convenient for detecting the load limit and speed limit data that they can withstand, which has an important role in optimizing the load-bearing capacity, load stability ability, and friction characteristics of magnetic fluid sliding bearings in the later stage, and has a profound impact on the development of magnetic fluid sliding bearings.

[0005] The technical solution of the utility model is as follows:

[0006] A magnetic fluid sliding bearing test bench, comprising:

[0007] A test tabletop;

[0008] A main shaft drive assembly, including a servo motor disposed above a bearing plate through a motor bracket, and an output end of the servo motor is connected to one end of the main shaft through a coupling;

[0009] A support assembly, including a pedestal bearing installed above the bearing plate, and the pedestal bearing is disposed on the main shaft for supporting the main shaft;

[0010] A tested magnetic fluid sliding bearing, including a tile-shaped permanent magnet, a permanent magnet mating ring, and a bushing sleeved on the journal of the main shaft, wherein the tile-shaped permanent magnet and the permanent magnet mating ring jointly form an annular structure covering the circumferential outer surface of the bushing. Among them, the tile-shaped permanent magnet is located directly below the main shaft, and there is a lubrication gap between the bushing and the main shaft, and a lubricating oil film formed by magnetic fluid is provided in the lubrication gap;

[0011] The tested magnetic fluid sliding bearing further includes a bearing housing, which includes a first housing body and a second housing body. After the first housing body and the second housing body are cooperated with each other, they are covered on the outer surfaces of the tile-shaped permanent magnet and the permanent magnet mating ring. In addition, the bearing housing further includes a first end cover provided on one side of the first housing body, and a second end cover provided on one side of the second housing body;

[0012] The radial loading assembly includes an arch-shaped mounting frame provided above the bearing plate, and the mounting frame is located at the end of the main shaft. A support frame is horizontally provided inside the mounting frame, and a jack is fixedly provided on the support frame. The output end of the jack is provided with a first loading bearing sleeve, and the stroke direction of the jack is vertically downward. In addition, the first loading bearing sleeve is also provided with a second loading sleeve through bolts. A loading bearing is provided between the first loading bearing sleeve and the second loading bearing sleeve. The loading bearing is sleeved on the end of the main shaft, and the loading bearing is in interference fit with the main shaft. Thus, the jack provides a radial load for the main shaft under the combined action of the first loading bearing sleeve, the second loading bearing sleeve and the loading bearing;

[0013] The detection assembly includes:

[0014] A torque sensor is provided on the coupling for detecting the torque provided by the servo motor for the main shaft;

[0015] A temperature sensor is provided inside the tested magnetic fluid sliding bearing through a plurality of first mounting holes for detecting the temperature of the lubricating oil film when the main shaft is rotating and being loaded;

[0016] A pressure sensor is provided on the first end cover for detecting the pressure of the lubricating oil film in the tested magnetic fluid sliding bearing when the main shaft is rotating and being loaded;

[0017] A displacement sensor is provided on the first end cover through a connecting member for detecting the displacement of the main shaft jumping in the radial direction when the main shaft is rotating and being loaded;

[0018] A loading force sensor is provided on the first loading bearing sleeve for detecting the magnitude of the load applied by the jack to the main shaft.

[0019] Preferably, the test tabletop includes a bearing plate and a base arranged in a stepped manner from top to bottom. Both the bearing plate and the base are made of steel plates, and a plurality of rib plates are provided between the bearing plate and the base. In addition, a plurality of through holes and threaded holes are preset on the bearing plate for accurately positioning and installing the main shaft driving assembly, the support assembly, the tested magnetic fluid sliding bearing and the radial loading assembly.

[0020] Preferably, the support assembly is located in the middle of the bearing plate. At the same time, in the overall structure formed by the cooperation of the main shaft drive assembly, the support assembly, the tested magnetic fluid sliding bearing, and the radial loading assembly, the support assembly is also located in the middle of this overall structure.

[0021] Furthermore, in the tested magnetic fluid sliding bearing, the permanent magnet mating ring is limit-connected to the first seat body through a connecting key, and the bushing is also limit-connected to the permanent magnet mating ring through a connecting key;

[0022] In addition, the axial ends of the tile-shaped permanent magnet and the permanent magnet mating ring are aligned with the axial ends of the bushing, and first sealing rings are provided on the axial end faces of the bushing to prevent magnetic fluid from leaking out from the joints between the axial ends of the bushing and the first seat body and the second seat body respectively.

[0023] Even further, in the bearing housing, the first seat body and the second seat body are each provided with an oil seal at the small-diameter end face close to the main shaft. In addition, on the first seat body and the second seat body, an oil collecting groove is provided on one side of the oil seal. In the axial direction of the main shaft, the two oil collecting grooves are located between the two oil seals for collecting overflow oil.

[0024] Preferably, in the bearing housing, an oil injection port and an oil discharge port are further provided on the second end cover, and the oil injection port is located above the main shaft and the oil discharge port is located below the main shaft. The oil injection port is connected to the gap between the bushing and the main shaft through a first oil passage to add magnetic fluid to the lubrication gap; the oil discharge port is connected to the two oil collecting grooves through a second oil passage for discharging the overflow oil before the bushing is disassembled; the oil injection port and the oil discharge port are each provided with a plug.

[0025] Preferably, the first oil passage starts from the oil injection port and successively penetrates through the second end cover, the second seat body, and the bushing, and then is connected to the lubrication gap between the bushing and the main shaft. On this basis, second sealing rings are provided at the positions where the first oil passage passes through the two contact surfaces at the contact surface between the second end cover and the second seat body and the contact surface between the second seat body and the bushing to prevent magnetic fluid from leaking out between the second end cover and the second seat body and between the second seat body and the bushing when adding magnetic fluid through the oil injection port and when the main shaft is running normally;

[0026] The second oil passage starts from the oil drain port and sequentially passes through the second end cap, the second housing, the bushing, and the first housing, and then communicates with the two oil collecting grooves. On this basis, at the contact surfaces of the second end cap and the second housing, the second housing and the bushing, and the first housing and the first end cap, third sealing rings are provided at the positions where the second oil passage passes through the three contact surfaces, so as to prevent magnetic fluid from leaking out between the second end cap and the second housing, between the second housing and the bushing, and between the first housing and the first end cap when the main shaft operates normally and the overflow oil is discharged through the oil drain port.

[0027] Preferably, in the detection assembly:

[0028] A plurality of the first mounting holes are all deep holes and are uniformly distributed on the top and both sides of the first housing. After the bottoms of the plurality of first mounting holes penetrate through the permanent magnet mating ring, they are located at positions close to the main shaft inside the bushing. On this basis, a temperature sensor is arranged in each of the first mounting holes;

[0029] On the first end cap, a plurality of pressure sensors are uniformly arranged along its circumferential direction, and each pressure sensor is provided with a third oil passage. The third oil passage starts from the end face of the first end cap and sequentially passes through the first end cap, the first housing, and the bushing, and then communicates with the lubricating oil film between the bushing and the main shaft. Each pressure sensor represents the pressure of the lubricating oil film in the tested magnetic fluid sliding bearing by detecting the pressure of the magnetic fluid in the corresponding third oil passage;

[0030] On the first end cap, two displacement sensors are provided, and they are arranged in a 90° angle with each other through connecting pieces in the same radial plane;

[0031] In addition, the detection assembly further includes a support platform for supporting the torque sensor, and the support platform is installed on the bearing plate.

[0032] Furthermore, the detection assembly further includes a paperless recorder, and the paperless recorder is electrically connected to the torque sensor, the temperature sensor, the pressure sensor, the displacement sensor, and the loading force sensor, and is used for displaying and recording the detection results of each sensor.

[0033] Furthermore, at the contact surfaces of the first end cap and the first housing, and the first housing and the bushing, fourth sealing rings are provided at the positions where the third oil passage passes through the two contact surfaces, so as to prevent magnetic fluid from leaking out between the first end cap and the first housing, and between the first housing and the bushing when the main shaft operates normally.

[0034] The beneficial effects of the present utility model are as follows:

[0035] Generally speaking, in the present utility model, each device component used in the test process is sequentially installed on the test tabletop. Specifically, the spindle driving component provides rotational speed and torque for the spindle, and the radial loading component provides radial load for the spindle. On this basis, the detection component is used to perform real-time testing on the lubrication performance of the tested magnetic fluid sliding bearing under working conditions such as adjusted rotational speed and load, which has important guiding significance for the design and optimization of the magnetic fluid sliding bearing.

[0036] Specifically, on the premise that the motor and the radial loading component respectively simulate different rotational speed conditions and different load conditions for the spindle, the cooperation of multiple first mounting holes and multiple temperature sensors is used to detect the temperature of the lubricating oil film; the pressure sensor is also used to detect the pressure of the lubricating oil film; the displacement sensor is used to detect the displacement of the spindle jumping in the radial direction; thereby obtaining the lubrication performance parameters such as the oil film pressure and oil film temperature at different positions inside the bearing, such as: under specific working conditions of the tested magnetic fluid sliding bearing; and also such as the spindle motion state parameters such as the radial loading force, rotational speed, and spindle radial displacement amount; the entire device has a simple structure, and the method of obtaining parameters is convenient and reliable, which has a profound impact on the development of the magnetic fluid sliding bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic diagram of the overall structure of the test bench in the present utility model;

[0039] Figure 2 It is a schematic diagram of the overall structure of the tested magnetic fluid sliding bearing in the present utility model;

[0040] Figure 3 It is a schematic diagram of the overall structure of the tested magnetic fluid sliding bearing from another angle in the present utility model;

[0041] Figure 4 It is a schematic diagram of the partial sectional structure of the tested magnetic fluid sliding bearing in the present utility model;

[0042] Figure 5 It is a schematic diagram of the partial sectional structure of the tested magnetic fluid sliding bearing from another angle in the present utility model;

[0043] Figure 6 It is a schematic diagram of the cooperation structure of the tile-shaped permanent magnet, the permanent magnet mating ring and the bushing in the present utility model;

[0044] Figure 7 This is a schematic cross-sectional view of the bushing in the present utility model;

[0045] Figure 8 This is a schematic structural diagram of the radial loading component in the present utility model. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0047] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] Next, the technical solutions provided by the present utility model will be described in detail in conjunction with the accompanying drawings.

[0049] In this technical solution, as Figure 1 shown, a magnetic fluid sliding bearing test bench includes: a test bench surface 1, a main shaft drive assembly 2, a support assembly 3, a tested magnetic fluid sliding bearing 4, a radial loading assembly 5, and a detection assembly 6.

[0050] Among them, as Figure 1As shown in the figure, the test tabletop 1 includes a bearing plate 101 and a base 102 arranged in a stepped manner from top to bottom. Both the bearing plate 101 and the base 102 are made of steel plates, and several rib plates 103 are provided between the bearing plate 101 and the base 102. In addition, several through holes and threaded holes are preset on the bearing plate 101 for accurately positioning and installing the spindle drive assembly 2, the support assembly 3, the tested magnetic fluid sliding bearing 4, and the radial loading assembly 5.

[0051] Based on the above embodiments, the test bench provided by the present application is stably supported by the test tabletop 1. The bearing plate 101 and the base 102 are both formed by welding steel plates, meeting the requirements of strength and stiffness, and providing a structural basis for the stable experiment of the test bench.

[0052] In this technical solution, as Figure 1 shown in the figure, the spindle drive assembly 2 includes a servo motor 202 disposed above the bearing plate 101 through a motor bracket 201. The output end of the servo motor 202 is connected to one end of the spindle 7 through a coupling 203.

[0053] Thus, through the cooperation of the coupling 203 and the servo motor 202, the spindle 7 obtains rotational power and torque.

[0054] As Figure 1 shown in the figure, the support assembly 3 includes a pedestal bearing 302 installed above the bearing plate 101 through a support seat 301. The pedestal bearing 302 is disposed on the spindle 7 for supporting the spindle 7. The pedestal bearing 302 and the spindle 7 are in interference fit. In addition, the support assembly 3 is located in the middle of the bearing plate 101. At the same time, in the overall structure formed by the mutual cooperation of the spindle drive assembly 2, the support assembly 3, the tested magnetic fluid sliding bearing 4, and the radial loading assembly 5, the support assembly 3 is also located in the middle of the overall structure, making the overall structure more stable during the working state.

[0055] More importantly, in order to improve the practicability of the test bench provided by the present application, the bushing 405 in the tested magnetic fluid sliding bearing 4 is set to be replaceable. In order to represent the integrity and accuracy of the simulation of the working conditions of the magnetic fluid sliding bearing by this test bench, a common magnetic fluid sliding bearing is provided in this embodiment to describe the overall implementation structure of this test bench in detail.

[0056] As Figures 2-7 shown in the figure, the tested magnetic fluid sliding bearing 4 includes a bearing housing 402, a tile-shaped permanent magnet 403, a permanent magnet mating ring 404, and a bushing 405 sleeved on the journal of the spindle 7.

[0057] The tile-shaped permanent magnet 403 and the permanent magnet mating ring 404 together form an annular structure covering the outer circumferential surface of the bushing 405. The axial ends of the tile-shaped permanent magnet 403 and the permanent magnet mating ring 404 are aligned with the axial ends of the bushing 405. The bushing 405 is limitedly connected to the permanent magnet mating ring 404 through a connection key. In addition, the tile-shaped permanent magnet 403 is located directly below the main shaft 7; there is a lubrication gap between the bushing 405 and the main shaft 7, and a lubricating oil film 8 formed by magnetic fluid is provided in the lubrication gap.

[0058] The bearing housing 402 includes a first housing body 406 and a second housing body 407. After the first housing body 406 and the second housing body 407 cooperate with each other, they are covered and arranged on the outer surfaces of the tile-shaped permanent magnet 403 and the permanent magnet mating ring 404. Among them, the permanent magnet mating ring 404 is also limitedly connected to the first housing body 406 through a connection key. In addition, an oil seal 414 is provided at the small-diameter end face of both the first housing body 406 and the second housing body 407 close to the main shaft 7. On the first housing body 406 and the second housing body 407, an oil sump 415 is further provided on one side of the oil seal 414. In the axial direction of the main shaft 7, the two oil sumps 415 are located between the two oil seals 414 for collecting overflow oil; on this basis, the bearing housing 402 further includes a first end cover 408 provided on one side of the first housing body 406, and a second end cover 409 provided on one side of the second housing body 407. The first end cover 408 and the second end cover 409 are respectively connected to the first housing body 406 and the second housing body 407 through screws.

[0059] So far, the preliminary structural assembly of the tested magnetic fluid sliding bearing 4 and the bearing housing 402 is completed. In the specific use of the magnetic fluid sliding bearing, it is necessary to inject magnetic fluid into the lubrication gap between the bushing 405 and the main shaft 7 to form the lubricating oil film 8.

[0060] Based on the above embodiments, as Figures 4-5 shown, in the bearing housing 402, an oil injection port 410 and an oil discharge port 411 are further provided on the second end cover 409. The oil injection port 410 is located above the main shaft 7, and the oil discharge port 411 is located below the main shaft 7. Plug heads 416 are provided for both the oil injection port 410 and the oil discharge port 411.

[0061] The oil injection port 410 is connected to the lubrication gap between the bushing 405 and the main shaft 7 through a first oil passage 412 to add magnetic fluid to the lubrication gap. Among them, the first oil passage 412 starts from the oil injection port 410, sequentially penetrates through the second end cover 409, the second housing body 407, and the bushing 405, and then is connected to the lubrication gap between the bushing 405 and the main shaft 7.

[0062] The oil drain port 411 is connected to two oil collecting tanks 415 through the second oil passage 413, which is used to drain the overflow oil before the bushing 405 is disassembled. The second oil passage 413 starts from the oil drain port 411 and sequentially passes through the second end cover 409, the second housing 407, the bushing 405, and the first housing 406, and then is connected to the two oil collecting tanks 415.

[0063] In this technical solution, in addition to the oil injection port 410, the first oil passage 412, the oil drain port 411, and the second oil passage 413 that enable the tested magnetic fluid sliding bearing 4 to work properly in the tested magnetic fluid sliding bearing 4, the problem of magnetic fluid leakage through the above devices also needs to be considered.

[0064] Therefore, in this application, as Figures 4-5 shown, first sealing rings 417 are provided on both axial end faces of the bushing 405 to prevent magnetic fluid from leaking out from the joints between the two axial ends of the bushing 405 and the first housing 406 and the second housing 407 respectively.

[0065] In addition, second sealing rings 418 are provided at the positions where the first oil passage 412 passes through the contact surfaces between the second end cover 409 and the second housing 407 and between the second housing 407 and the bushing 405, which are used to prevent magnetic fluid from seeping out between the second end cover 409 and the second housing 407 and between the second housing 407 and the bushing 405 when adding magnetic fluid through the oil injection port 410 and when the main shaft 7 is running normally.

[0066] Third sealing rings 419 are provided at the positions where the second oil passage 413 passes through the contact surfaces between the second end cover 409 and the second housing 407, between the second housing 407 and the bushing 405, and between the first housing 406 and the first end cover 408, which are used to prevent magnetic fluid from seeping out between the second end cover 409 and the second housing 407, between the second housing 407 and the bushing 405, and between the first housing 406 and the first end cover 408 when the main shaft 7 is running normally and when draining the overflow oil through the oil drain port 411.

[0067] So far, the specific structure of the tested magnetic fluid sliding bearing 4 is assembled. Since one of the test variables of the test bench provided by the present utility model for the tested magnetic fluid sliding bearing 4 is the rotational speed, which can be provided by the above-mentioned main shaft drive assembly 2, and the other is the load, which is provided by the radial loading assembly 5, the radial loading assembly 5 will be described in detail next.

[0068] As Figure 8As shown in the figure, the radial loading component 5 includes an arch-shaped mounting bracket 501 disposed above the bearing plate 101, and the mounting bracket 501 is located at the end of the main shaft 7. A support bracket 502 is horizontally disposed inside the mounting bracket 501. A jack 503 is fixedly disposed on the support bracket 502. The output end of the jack 503 is provided with a first loading bearing sleeve 504, and the stroke direction of the jack 503 is vertically downward. In addition, the first loading bearing sleeve 504 is further provided with a second loading sleeve 505 through bolt cooperation. A loading bearing 506 is disposed between the first loading bearing sleeve 504 and the second loading bearing sleeve 505. The loading bearing 506 is sleeved on the end of the main shaft 7, and the loading bearing 506 is in interference fit with the main shaft 7.

[0069] Based on the above embodiment, the jack 503 provides a radial load for the main shaft 7 under the combined action of the first loading bearing sleeve 504, the second loading bearing sleeve 505 and the loading bearing 506.

[0070] Thus, the test bench provided by the present application can simulate the motion of the main shaft 7 and the tested magnetic fluid sliding bearing 4 under the above structural basis. Specifically, for the detection of various motion parameters of the tested magnetic fluid sliding bearing 4 and the main shaft 7, the detection component 6 is required.

[0071] In the present technical solution, the detection component 6 needs to be incorporated into the main shaft drive component 2, the tested magnetic fluid sliding bearing 4 and the radial loading component 5. The detection component 6 includes: a torque sensor 601, a temperature sensor 602, a pressure sensor 603, a displacement sensor 604, a loading force sensor 605 and a paperless recorder.

[0072] As Figure 1 shown, the torque sensor 601 is mounted on the bearing plate 101 through the support platform 609.

[0073] As Figures 2-5 shown, a plurality of temperature sensors 602 are provided, and are disposed inside the tested magnetic fluid sliding bearing 4 through a plurality of first mounting holes 606. Among them, the plurality of first mounting holes 606 are all deep holes, and are uniformly distributed on the top and both sides of the first seat body 406. After the bottoms of the plurality of first mounting holes 606 penetrate through the permanent magnet mating ring 404, they are located at a position inside the bushing 405 close to the main shaft 7; on this basis, a temperature sensor 602 is disposed in each first mounting hole 606.

[0074] Based on the above embodiment, each first mounting hole 606 is located inside the bushing 405 or at a position close to the bushing 405. By detecting the temperature of the bushing 405, it is approximately considered as the temperature of the lubricating oil film 8 when the tested magnetic fluid sliding bearing 4 rotates and is loaded, and the detected temperature result is transmitted to the paperless recorder.

[0075] As Figure 2 , Figure 5 shown, there are also multiple pressure sensors 603, which are arranged circumferentially on the first end cover 408. Each pressure sensor 603 is equipped with a third oil passage 608. The third oil passage 608 starts from the end face of the first end cover 408, sequentially penetrates the first end cover 408, the first housing 406, and the bushing 405, and then communicates with the lubricating oil film 8 between the bushing 405 and the main shaft 7.

[0076] Based on the above embodiments, each pressure sensor 603 detects the pressure of the magnetic fluid in the corresponding third oil passage 608 to represent the pressure of the lubricating oil film 8 in the tested magnetic fluid bearing 4 of the main shaft 7 when the main shaft 7 is rotating and under load, and transmits the detected pressure result to the paperless recorder.

[0077] In addition, the present application also sets a fourth sealing ring 610 at the contact surface between the first end cover 408 and the first housing 406, at the contact surface between the first housing 406 and the bushing 405, and at the position where the third oil passage 608 passes through these two contact surfaces, to prevent the magnetic fluid from leaking out between the first end cover 408 and the first housing 406 and between the first housing 406 and the bushing 405 when the main shaft 7 is running normally.

[0078] As Figure 2 shown, two displacement sensors 604 are provided, both of which are arranged on the first end cover 408 through a connecting member 611, and the two displacement sensors 604 are arranged at a 90° angle to each other in the same radial plane. Any one of the displacement sensors 604 is used to detect the horizontal displacement of the main shaft 7, and the other displacement sensor 604 is used to detect the vertical displacement of the main shaft 7.

[0079] Based on the above embodiments, the horizontal displacement and the vertical displacement of the main shaft 7 in a vertical diametral plane are respectively detected by the two displacement sensors 604, the displacement of the main shaft 7 jumping in any radial direction when rotating and under load is obtained, and the detected displacement result is transmitted to the paperless recorder.

[0080] As Figure 8 shown, the loading force sensor 605 is arranged on the first loading bearing sleeve 504 to detect the magnitude of the load applied by the jack 503 to the main shaft 7, and transmits the detected load result to the paperless recorder.

[0081] The paperless recorder is electrically connected to the torque sensor 601, the temperature sensor 602, the pressure sensor 603, the displacement sensor 604, and the loading force sensor 605, and is used to display and record the detection results of each sensor. The paperless recorder is not shown in the figure.

[0082] So far, the above test bench can conduct specific test experiments on the tested magnetic fluid sliding bearing 4.

[0083] Specifically, when using the above test bench to test the tested magnetic fluid sliding bearing 4:

[0084] First, the main shaft drive assembly 2, the support assembly 3, the tested magnetic fluid sliding bearing 4, and the radial loading assembly 5 are sequentially arranged on the test table 1. Among them, with the installation of the tested magnetic fluid sliding bearing 4 as the core, the main shaft drive assembly 2, the support assembly 3, and the radial loading assembly 5 are all arranged in cooperation with the tested magnetic fluid sliding bearing 4; in the tested magnetic fluid sliding bearing 4, with the installation of the tested magnetic fluid sliding bearing 4 as the core, the bearing housing 402 is arranged in cooperation with the tested magnetic fluid sliding bearing 4; and the oil injection method, pipeline design, and sealing design in the tested magnetic fluid sliding bearing 4 are all designed as required according to the type of the tested magnetic fluid sliding bearing 4 in a conventional setting method.

[0085] Then, the detection assembly 6 needs to be integrated into the main shaft drive assembly 2, the tested magnetic fluid sliding bearing 4, and the radial loading assembly 5. Install each sensor at the corresponding installation test point and connect it to the paperless recorder for the final device calibration.

[0086] Start the servo motor 202, inject the magnetic fluid into the lubrication gap between the bushing 405 and the main shaft 7 through the oil injection port 410 according to the specified amount in the test plan, control the servo motor 202 to run at a low speed first, check the operating status of each component of the test bench to ensure that there are no abnormal conditions such as liquid leakage, abnormal noise, and shutdown; then change the speed output of the servo motor 202 and the loading force provided by the jack 503 according to the experimental plan, observe the changes of various data through the paperless recorder, and collect and record the key data such as the torque of the main shaft 7, the temperature and pressure of the lubricating oil film in real time, and at the same time observe the lubrication state of the tested magnetic fluid sliding bearing 4 during the test process.

[0087] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic fluid sliding bearing test bench, characterized in that Comprising: Test tabletop; Spindle drive assembly, including a servo motor disposed above the carrier plate through a motor bracket, and an output end of the servo motor is connected to one end of the spindle through a coupling; Support assembly, including a pedestal bearing mounted above the carrier plate, and the pedestal bearing is disposed on the spindle for supporting the spindle; Tested magnetic fluid sliding bearing, including a tile-shaped permanent magnet, a permanent magnet mating ring, and a bushing sleeved at the journal of the spindle. The tile-shaped permanent magnet and the permanent magnet mating ring together form an annular structure covering the circumferential outer surface of the bushing. Among them, the tile-shaped permanent magnet is located directly below the spindle, and there is a lubrication gap between the bushing and the spindle, and a lubricating oil film formed by magnetic fluid is provided in the lubrication gap; The tested magnetic fluid sliding bearing further includes a bearing housing, and the bearing housing includes a first housing body and a second housing body. After the first housing body and the second housing body are mutually fitted, they are covered and disposed on the outer surfaces of the tile-shaped permanent magnet and the permanent magnet mating ring. In addition, the bearing housing further includes a first end cover disposed on one side of the first housing body, and a second end cover disposed on one side of the second housing body; Radial loading assembly, including an arch-shaped mounting frame disposed above the carrier plate, and the mounting frame is located at the end of the spindle. A support frame is horizontally provided inside the mounting frame, and a jack is fixedly provided on the support frame. An output end of the jack is provided with a first loading bearing sleeve, and a stroke direction of the jack is vertically downward. In addition, the first loading bearing sleeve is further provided with a second loading shaft sleeve through bolt fitting. A loading bearing is disposed between the first loading bearing sleeve and the second loading bearing sleeve. The loading bearing is sleeved on the end of the spindle, and the loading bearing is in interference fit with the spindle. Thus, the jack provides a radial load for the spindle under the combined action of the first loading bearing sleeve, the second loading bearing sleeve and the loading bearing; Detection assembly, including: Torque sensor, disposed on the coupling for detecting the torque provided by the servo motor for the spindle; Temperature sensor, disposed inside the tested magnetic fluid sliding bearing through a plurality of first mounting holes for detecting the temperature of the lubricating oil film when the spindle rotates and is loaded; Pressure sensor, disposed on the first end cover for detecting the pressure of the lubricating oil film in the tested magnetic fluid sliding bearing when the spindle rotates and is loaded; Displacement sensor, disposed on the first end cover through a connecting member for detecting the displacement of the spindle jumping in the radial direction when the spindle rotates and is loaded; Loading force sensor, disposed on the first loading bearing sleeve for detecting the magnitude of the load applied by the jack to the spindle.

2. The magnetic fluid sliding bearing test bench according to claim 1, characterized in that: The test tabletop includes a carrier plate and a base arranged in a stepped manner from top to bottom. Both the carrier plate and the base are made of steel plates, and a plurality of rib plates are provided between the carrier plate and the base. In addition, a plurality of through holes and threaded holes are preset on the carrier plate for accurately positioning and installing the spindle drive assembly, the support assembly, the tested magnetic fluid sliding bearing and the radial loading assembly.

3. The magnetic fluid sliding bearing test bench according to claim 2, characterized in that: The support assembly is located in the middle of the bearing plate. At the same time, in the overall structure formed by the cooperation of the main shaft drive assembly, the support assembly, the tested magnetic fluid sliding bearing, and the radial loading assembly, the support assembly is also located in the middle of this overall structure.

4. The magnetic fluid sliding bearing test bench according to claim 3, characterized in that: In the tested magnetic fluid sliding bearing, the permanent magnet mating ring is limitedly connected to the first seat body through a connection key, and the bushing is also limitedly connected to the permanent magnet mating ring through a connection key. In addition, the axial ends of the tile-shaped permanent magnet and the permanent magnet mating ring are aligned with the axial ends of the bushing, and first sealing rings are provided on the axial end faces of the bushing to prevent magnetic fluid from leaking out from the joints where the axial ends of the bushing are respectively in contact with the first seat body and the second seat body.

5. The magnetic fluid sliding bearing test bench according to claim 4, characterized in that: In the bearing housing, the first seat body and the second seat body are both provided with an oil seal at the small-diameter end face close to the main shaft. In addition, on the first seat body and the second seat body, an oil collecting groove is provided on one side of the oil seal. In the axial direction of the main shaft, the two oil collecting grooves are located between the two oil seals and are used to collect overflow oil.

6. The magnetic fluid sliding bearing test bench according to claim 5, characterized in that: In the bearing housing, an oil injection port and an oil drain port are further provided on the second end cover. The oil injection port is located above the main shaft, and the oil drain port is located below the main shaft. The oil injection port is connected to the gap between the bushing and the main shaft through a first oil passage to add magnetic fluid to the lubrication gap; the oil drain port is connected to the two oil collecting grooves through a second oil passage and is used to drain the overflow oil before the bushing is disassembled; the oil injection port and the oil drain port are both provided with plugs.

7. A magnetic fluid sliding bearing test bench according to claim 6, characterized in that: The first oil passage starts from the oil injection port, sequentially penetrates the second end cover, the second seat body, and the bushing, and then communicates with the lubrication gap between the bushing and the main shaft. On this basis, second sealing rings are provided at the positions where the first oil passage passes through the two contact surfaces on the contact surface between the second end cover and the second seat body and the contact surface between the second seat body and the bushing, so as to prevent magnetic fluid from seeping out between the second end cover and the second seat body and between the second seat body and the bushing when adding magnetic fluid through the oil injection port and when the main shaft is running normally. The second oil passage starts from the oil drain port, sequentially penetrates the second end cover, the second seat body, the bushing, and the first seat body, and then communicates with the two oil collecting grooves. On this basis, third sealing rings are provided at the positions where the second oil passage passes through the three contact surfaces on the contact surface between the second end cover and the second seat body, the contact surface between the second seat body and the bushing, and the contact surface between the first seat body and the first end cover, so as to prevent magnetic fluid from seeping out between the second end cover and the second seat body, between the second seat body and the bushing, and between the first seat body and the first end cover when the main shaft is running normally and when draining the overflow oil through the oil drain port.

8. A magnetic fluid sliding bearing test bench according to claim 7, characterized in that: In the detection assembly: A plurality of the first mounting holes are all deep holes and are evenly distributed on the top and both sides of the first seat body. After the bottoms of the plurality of first mounting holes penetrate the permanent magnet mating ring, they are located at positions close to the main shaft inside the bushing. On this basis, a temperature sensor is provided in each of the first mounting holes. On the first end cover, a plurality of pressure sensors are uniformly arranged along its circumferential direction, and each pressure sensor is provided with a third oil passage. The third oil passage starts from the end face of the first end cover, sequentially penetrates through the first end cover, the first housing, and the bushing, and then communicates with the lubricating oil film between the bushing and the main shaft. Each pressure sensor represents the pressure of the lubricating oil film in the tested magnetic fluid sliding bearing by detecting the pressure of the magnetic fluid in the corresponding third oil passage; On the first end cover, two displacement sensors are provided, and they are arranged in a 90° angle to each other through connectors in the same radial plane; In addition, the detection component further includes a support platform for supporting the torque sensor, and the support platform is installed on the bearing plate.

9. A magnetic fluid sliding bearing test bench according to claim 8, characterized in that: The detection component further includes a paperless recorder, which is electrically connected to the torque sensor, the temperature sensor, the pressure sensor, the displacement sensor, and the loading force sensor, and is used to display and record the detection results of each sensor.

10. A magnetic fluid sliding bearing test bench according to claim 9, characterized in that: At the contact surfaces between the first end cover and the first housing, and between the first housing and the bushing, fourth sealing rings are provided at the positions where the third oil passage passes through the two contact surfaces, so as to prevent the magnetic fluid from leaking out between the first end cover and the first housing, and between the first housing and the bushing during the normal operation of the main shaft.

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