CN114383843A - Double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load - Google Patents
Double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Abstract
A double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load belongs to the technical field of dynamic pressure sliding bearing overall performance measurement. The dynamic pressure slide bearing experiment table comprises a platform, an experiment bearing system, a supporting bearing system and an experiment shaft rotating system, wherein the experiment bearing system, the supporting bearing system and the experiment shaft rotating system are arranged on the platform, the platform is provided with a plurality of T-shaped grooves, the experiment bearing system comprises a first sliding bearing block, an experiment bearing is arranged in the first sliding bearing block, the supporting bearing system comprises a rolling bearing seat and a supporting bearing arranged inside the rolling bearing seat, the experiment shaft rotating system comprises a first servo motor and a main shaft connected with the first servo motor, and the main shaft penetrates through the experiment bearing and the supporting bearing. The dynamic pressure sliding bearing experiment table capable of applying dynamic load in the double-span mode is small in size, simple in lubrication, stable in loading process, fast in response, clean and convenient, and realizes coupling test of unbalanced and dynamic loads through different installation modes.
Description
Technical Field
The invention relates to the technical field of dynamic pressure sliding bearing overall performance measurement, in particular to a double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load.
Background
Fluid lubricated sliding bearings are classified into dynamic pressure sliding bearings, static pressure sliding bearings, and dynamic and static pressure sliding bearings according to the lubrication mechanism. The dynamic pressure sliding bearing has the advantages of low cost, long service life, simple lubrication, high radial positioning precision, good running stability, low noise, capability of better absorbing external vibration and low power consumption, and is mostly applied to mechanical equipment with high rotating speed and high precision.
The study of sliding bearings has been regarded as important. At present, most of experiment tables for dynamic pressure sliding bearing research are used for researching specific dynamic pressure sliding bearing parameters, and a large-scale hydraulic device is needed by a traditional sliding bearing experiment table to provide lubrication and apply load for the experiment table, so that the experiment table is large in size and complex to use. For example, patent No. CN 200510097339.9-multifunctional sliding bearing test stand, patent No. CN 201920993699.4-a test device for measuring and researching sliding bearings, the mentioned test stand can not test the bearing characteristics under the condition of unbalance of sliding bearings; the patent with application number CN 201910398600.0-an adjustable eccentric sliding bearing test device, such test table can only change single variables, such as eccentric amount, rotation speed, load, etc., and cannot satisfy the research on the influence of coupling multiple experimental variables on the bearing rotor system; the patent with application number CN 201320646200.5-oil film bearing test bed has a single measured result, and the influence of bearing parameter change on the system is mostly studied for one result. The dynamic load performance test bed of patent No. CN 200410052708.8-oil-containing bearing, the horizontal sliding bearing test bed of patent No. CN201710667792.1, the horizontal sliding bearing performance test bed of patent No. CN201811112159.7, the high-speed large-load horizontal sliding bearing performance test bed and the sliding bearing test bed of patent No. CN201922054176.6 for applying any regular variable load can not ensure the loading stability because the used hydraulic station provides the lubricating and loading modes.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load, which is small in size, simple in lubrication, stable in loading process, quick in response, clean and convenient, and realizes coupling test of unbalanced and dynamic load through different installation modes.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load comprises a platform, an experiment bearing system, a supporting bearing system and an experiment shaft rotating system, wherein the experiment bearing system, the supporting bearing system and the experiment shaft rotating system are arranged on the platform;
the platform is provided with a plurality of T-shaped grooves for mounting an experimental bearing system, a supporting bearing system and an experimental shaft rotating system;
the experimental bearing system comprises a first sliding bearing seat sizing block, and an experimental bearing is arranged in the first sliding bearing seat sizing block;
the support bearing system comprises a rolling bearing seat and a support bearing arranged in the rolling bearing seat;
the experiment shaft rotating system comprises a first servo motor and a main shaft connected with the first servo motor, and the main shaft penetrates through the experiment bearing and the supporting bearing.
Furthermore, the double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load further comprises a load applying system, wherein the load applying system comprises a second servo motor and a servo electric cylinder connected with the second servo motor, and the servo electric cylinder is connected with the experiment bearing or the support bearing through a spring shock absorber.
Further, the servo electric cylinder is connected with the experiment bearing through a spring damper and is specifically set as follows: the servo electric cylinder is arranged on the platform through a first servo electric cylinder sizing block, the front end of the servo electric cylinder is connected with a first lifting lug, the first lifting lug is connected with a first connecting ring at one end of a spring shock absorber, a second connecting ring at the other end of the spring shock absorber is connected with a second lifting lug on a spoke type pressure sensor, and the spoke type pressure sensor is arranged on a first sliding bearing seat sizing block;
the servo electric cylinder is connected with the supporting bearing through the spring shock absorber and is specifically set as follows: the servo electric cylinder is arranged on the platform through a servo electric cylinder sizing block II, a first lifting lug is connected to the front end of the servo electric cylinder, the first lifting lug is connected with a first connecting ring at one end of a spring damper, a second connecting ring at the other end of the spring damper is connected with a second lifting lug on a spoke type pressure sensor, and the spoke type pressure sensor is arranged on a second rolling bearing seat sizing block.
Furthermore, a fine thread threaded hole is formed in the upper portion of the experimental bearing and used for being connected with an oil injection end of a hydraulic pump; and a coarse thread threaded hole is formed in the side part of the experimental bearing and used for mounting a temperature sensor.
Furthermore, the double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load further comprises a control system, wherein the control system comprises a computer, and a controller and a signal acquisition card which are connected with the computer;
the controller is respectively connected with the first servo motor and the second servo motor and is used for controlling the first servo motor and the second servo motor to work;
the signal acquisition card is respectively connected with the first eddy current sensor, the second eddy current sensor, the spoke type pressure sensor and the temperature sensor, and the first eddy current sensor and the second eddy current sensor acquire main shaft linear displacement or experimental bearing linear displacement data and send the data to a computer for displaying, recording and storing; the spoke type pressure sensor collects tension data applied by the servo electric cylinder and sends the tension data to a computer for displaying, recording and storing; the temperature sensor collects temperature data of the experimental bearing and sends the temperature data to the computer for displaying, recording and storing.
Furthermore, the lower part of the first sliding bearing seat sizing block is arranged on the platform sequentially through a second sliding bearing seat sizing block, a sliding block and a sliding rail, or the lower part of the first sliding bearing seat sizing block is arranged on the platform through a third sliding bearing seat sizing block.
Furthermore, the lower part of the rolling bearing seat is arranged on the platform through a first rolling bearing seat sizing block, or the lower part of the rolling bearing seat is arranged on the platform through a second rolling bearing seat sizing block, a sliding block and a sliding rail in sequence.
Furthermore, the first eddy current sensor and the second eddy current sensor are supported by a sensor support, and the sensor support is arranged on the platform through an aluminum profile support.
Furthermore, a lower surface of the sliding bearing seat sizing block is designed in a sealing mode.
Further, the main shaft is provided with an unbalance amount experiment disc.
The invention has the beneficial effects that:
1) the invention provides a small high-speed dynamic-pressure sliding bearing experiment table with flexible loading and various functions, which provides a loading mode with more convenience and rapidness in response, uses a servo electric cylinder and a damping system for loading, can ensure that the loading process is stable, quick in response, clean and convenient, and uses the servo electric cylinder to replace a traditional hydraulic system to apply load and dynamic load, the load response is rapid, the size is small, the complexity of using the hydraulic system is avoided, and the servo electric cylinder is more suitable for applying load and dynamic load to the small bearing experiment table;
2) the main shaft is fixed in a double-span fixing mode, namely two supporting bearings and one experimental bearing are simultaneously arranged on the main shaft, the main shaft is supported by the bearings at two ends, and the bearing in the middle applies load or dynamic load;
3) according to the invention, a spring damping element is added between the servo electric cylinder and the sensor, so that the influence of the vibration of the test system on the servo electric cylinder during the test is reduced, and the stability of the applied load and the dynamic load is ensured, so that the data accuracy of the loaded test is ensured;
4) the invention adopts a modularized design, is easy to adjust, can adjust the position of the module according to the test requirement to carry out the test of basic parameters of the bearing under dynamic load (comprising different eccentric quantities, rotating speeds, bearing length-diameter ratio, load, multiphase flow and the like), and can also couple the change of the basic parameters of the bearing and the influence caused by typical faults of a rotor (comprising misalignment, unbalance and dynamic load) together to analyze the change rule of the axis track, temperature rise and rigidity damping of the bearing;
5) the bearing for applying the load is fixed by adopting the linear optical axis slide rail slide block, so that the displacement in the direction of applying the load is ensured, the freedom degrees in other directions are limited, and the freedom degrees in all directions can be limited by the locking nut arranged on the locking slide block;
6) the dynamic pressure sliding bearing test data obtained by the invention is coupled with the basic parameters and typical fault influences of the bearing, can effectively ensure that the performance parameters such as the axis track, the temperature rise, the rigidity, the damping and the like are close to reality in the experimental process, provides guiding experimental data for engineering application, can easily change the influences of the basic parameters and the typical fault of the bearing in the experiment, and can couple the two influences for simultaneous experiment; the experiment table is flexible and adjustable, the positions of the experiment bearing and the supporting bearing can be exchanged, and experimental parts can be installed according to requirements, so that the experimental study on the performance of the bearing can be carried out, and the experimental study on the characteristics of the bearing under the coupling of a rotor system can also be developed;
7) the invention provides a dynamic pressure sliding bearing experiment table which can change bearing parameters and apply typical faults to a sliding bearing by combining with the actual requirements of the bearing according to the conditions of the stress mode and the like of the dynamic pressure sliding bearing during operation.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a schematic perspective view of a double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load according to an embodiment of the present invention;
fig. 2 is a top view of a double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load according to an embodiment of the present invention;
FIG. 3 is a sectional view A-A of FIG. 2 (a partial sectional view of the sliding bearing housing shim-an internal hydrodynamic plain bearing installation);
FIG. 4 is a cross-sectional view B-B of FIG. 2 (a side view of a first eddy current sensor and a second eddy current sensor);
FIG. 5 is a cross-sectional view C-C of FIG. 2 (cross-sectional view of rolling bearing chock block one);
fig. 6 is a schematic perspective view of a double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load according to a second embodiment of the present invention;
fig. 7 is a schematic perspective view of a double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load according to a third embodiment of the present invention;
fig. 8 is a schematic diagram of the nut special for the T-shaped groove provided by the invention matched with the T-shaped groove.
Reference numerals in the drawings of the specification include:
1. a platform; 2. a first servo electric cylinder sizing block; 3. a servo motor II; 4. a servo electric cylinder; 5. a first lifting lug; 6. a connecting ring I; 7. a spring damper; 8. an aluminum section bracket; 9. an oil retaining shell; 10. a sliding bearing seat sizing block I; 11. sliding a bearing seat sizing block II; 12. a slide rail; 13. a main shaft; 14. a rolling bearing seat; 15. a first rolling bearing seat sizing block; 16. a motor bracket; 17. a first servo motor; 18. a quincuncial coupler; 19. a spoke-type pressure sensor; 20. hydrodynamic plain bearings; 21. a sensor holder; 22. sliding bearing seat sizing blocks III; 23. an unbalance amount experiment disc; 24. a second rolling bearing seat sizing block; 25. a deep groove ball bearing; 26. a second lifting lug; 27. a connecting ring II; 28. a first eddy current sensor; 29. a nut special for a T-shaped groove; 30. a tensioning sleeve; 31. a second servo electric cylinder sizing block; 32. fine thread holes; 33. an oil outlet hole; 34. coarse thread threaded holes; 35. and a second eddy current sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "a," "an," "two," and "three" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 8, the invention provides a double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load, which comprises a platform 1, an experiment bearing system, a supporting bearing system and an experiment shaft rotating system, wherein the experiment bearing system, the supporting bearing system and the experiment shaft rotating system are arranged on the platform 1;
the platform 1 is provided with a plurality of T-shaped grooves;
the experimental bearing system comprises a first sliding bearing block sizing block 10, and an experimental bearing is arranged in the first sliding bearing block sizing block 10;
the support bearing system comprises a rolling bearing seat 14 and a support bearing arranged inside the rolling bearing seat 14;
the experiment shaft rotating system comprises a servo motor I17 and a main shaft 13 connected with the servo motor I17, and the main shaft 13 penetrates through an experiment bearing and a supporting bearing.
The invention provides a laboratory bench for researching basic characteristics and typical fault influences of a dynamic pressure sliding bearing 20, wherein a base is a platform 1 for processing a T-shaped groove, a servo motor I17 is fixed on the platform 1 through a motor support 16, and a linear optical axis is connected with the servo motor I17 through a plum coupling 18; the two ends of the linear optical axis are provided with supporting bearings, and the experimental bearing is arranged in the middle of the optical axis; the support bearing is arranged in the rolling bearing seat 14 and is fixed on the platform 1 through a rolling bearing seat sizing block I15; the dynamic pressure sliding bearing 20 is fixed on the platform 1 through a sliding bearing seat sizing block I10 and a sliding rail 12, a spoke type pressure sensor 19 is installed at the tail end of the sliding bearing seat sizing block I10 through a bolt, the spoke type pressure sensor 19 is connected with the servo electric cylinder 4 through a lifting lug and a spring shock absorber 7, and the servo electric cylinder 4 is driven by a servo motor II 3 fixed at the tail end; an opening at the upper end of the dynamic pressure sliding bearing 20 is connected with an oil filling end of a hydraulic oil supply device, and lubricating oil is discharged through an oil outlet of the sliding bearing seat sizing block I10. The experiment table can respectively aim at the basic characteristics and typical fault comparison of the bearing and the actual service condition by flexibly changing the positions of the supporting bearing and the experimental bearing, and couple the typical fault influence and the bearing basic condition parameter change to the system influence together to provide more accurate experiment data.
The double-span dynamic pressure sliding bearing 20 experiment table capable of applying dynamic load further comprises a load applying system, wherein the load applying system comprises a second servo motor 3 and a servo electric cylinder 4 connected with the second servo motor 3, and the servo electric cylinder 4 is connected with an experiment bearing or a supporting bearing through a spring shock absorber 7.
Further, the servo electric cylinder 4 is connected with the experiment bearing through a spring damper 7, and the concrete setting is as follows: the servo electric cylinder 4 is arranged on the platform 1 through a servo electric cylinder sizing block I2, the front end of the servo electric cylinder 4 is connected with a lifting lug I5, the lifting lug I5 is connected with a connecting ring I6 at one end of a spring shock absorber 7, a connecting ring II 27 at the other end of the spring shock absorber 7 is connected with a lifting lug II 26 on a spoke type pressure sensor 19, and the spoke type pressure sensor 19 is arranged on a sliding bearing base sizing block I10;
the servo electric cylinder 4 is connected with the supporting bearing through a spring damper 7, and the concrete setting is as follows: the servo electric cylinder 4 is arranged on the platform 1 through a servo electric cylinder sizing block II 31, the front end of the servo electric cylinder 4 is connected with a lifting lug I5, the lifting lug I5 is connected with a connecting ring I6 at one end of the spring shock absorber 7, a connecting ring II 27 at the other end of the spring shock absorber 7 is connected with a lifting lug II 26 on the spoke type pressure sensor 19, and the spoke type pressure sensor 19 is installed on a rolling bearing base sizing block II 24.
In the invention, the characteristics and faults of the dynamic pressure sliding bearing 20 are influenced by the bearing parameters and typical faults in actual work, so in order to ensure that experimental data are closer to the actual data, the sliding bearing parameters and the typical faults are coupled together for research on the bearing characteristics. The load end is connected with the servo electric cylinder 4 by using the servo motor II 3 to apply load, not only can static load be applied, but also different types of impact can be applied on the basis of applying the static load. Compared with a traditional mode of applying load by using a hydraulic station in an experiment, the servo electric cylinder 4 is controlled by the servo motor II 3 to apply load more accurately, the load frequency is higher, and the high-frequency load testing device is suitable for a middle-size and small-size dynamic pressure sliding bearing 20 high-frequency load test. The load end is connected with the experimental part through the spring damper 7, so that the influence of the vibration of the experimental bearing part on the accuracy of applied load and experimental data is reduced. The spoke type pressure sensor 19 connected between the bearing seat and the servo electric cylinder 4 can not only record data, but also reversely verify the accuracy of the applied dynamic load.
As shown in fig. 3, a fine thread threaded hole 32 is formed in the upper part of the experimental bearing and used for connecting an oil injection end of a hydraulic pump; the side part of the experimental bearing is provided with a coarse thread threaded hole 34 for mounting a temperature sensor.
In the invention, a fine thread hole 32 is formed in the upper part of the dynamic pressure sliding bearing 20, the fine thread hole 32 is connected with an oil injection end of a hydraulic pump through a nylon oil pipe to provide lubricating oil for the dynamic pressure sliding bearing 20, the lubricating oil flowing out of the dynamic pressure sliding bearing 20 flows into the sliding bearing seat sizing block I10, the lubricating oil is discharged out of the sliding bearing seat sizing block I10 through an oil outlet hole 33 in the front end of the sliding bearing seat sizing block I10 and is convenient to recover, and an oil blocking shell 9 is arranged at the top of the sliding bearing seat sizing block I10 to prevent oil leakage. The dynamic pressure sliding bearing 20 is provided with a coarse thread threaded hole 34 at the side part, the coarse thread threaded hole 34 is machined into a bearing bushing, a temperature sensor is installed, and data such as oil film temperature rise and the like are obtained through heat conduction on the premise that a bushing material is known.
The double-span dynamic pressure sliding bearing 20 experiment table capable of applying dynamic load also comprises a control system, wherein the control system comprises a computer, a controller and a signal acquisition card which are connected with the computer;
the controller is respectively connected with the first servo motor 17 and the second servo motor 3 and is used for controlling the first servo motor 17 and the second servo motor 3 to work;
the signal acquisition card is respectively connected with the first eddy current sensor 28, the second eddy current sensor 35, the spoke type pressure sensor 19 and the temperature sensor, and the first eddy current sensor 28 and the second eddy current sensor 35 acquire linear displacement of the main shaft 13 or experimental bearing line data and send the linear displacement or experimental bearing line data to a computer for displaying, recording and storing; the spoke type pressure sensor 19 collects tension data applied by the servo electric cylinder 4 and sends the tension data to a computer for displaying, recording and storing; the temperature sensor collects temperature data of the experimental bearing and sends the temperature data to the computer for displaying, recording and storing.
According to the invention, a controller adopts a PLC (programmable logic controller), a first servo motor 17 is used as a driving motor, the first servo motor 17 is arranged on a platform 1 through a motor support 16, the controller is connected with a control end of the first servo motor 17, and the requirements of different rotating speeds, forward and reverse rotation and acceleration and deceleration of an experiment are met through the control of the controller; the servo motor II 3 is used as a control motor, the controller and the control end of the servo motor II 3 are connected with the control end of the servo motor II 3 and are connected with a computer for control, and the displacement, speed, positive and negative rotation and displacement speed curves of the motor are controlled through the PLC, so that the requirement that the servo electric cylinder 4 applies load or dynamic load to the experimental system is met; the spoke type pressure sensor 19 is arranged on the side face of the experimental bearing or the side face of the supporting bearing, the signal end of the spoke type pressure sensor 19 is connected with a signal acquisition card, a pressure signal acquired by the spoke type pressure sensor 19 is sent to a computer through the signal acquisition card, the computer displays, records and stores the pressure signal, and meanwhile, the accuracy of data display of the data reverse correction instrument can be recorded through the computer. The first eddy current sensor 28 is arranged at the top of the experimental bearing and used for acquiring linear displacement data of the main shaft 13 or the experimental bearing in the vertical direction; the second eddy current sensor 35 is arranged on the side face of the experimental bearing and used for acquiring linear displacement data of the main shaft 13 or the experimental bearing in the horizontal direction.
The lower part of the first sliding bearing seat sizing block 10 is arranged on the platform 1 sequentially through the second sliding bearing seat sizing block 11, the sliding block and the sliding rail 12, or the lower part of the first sliding bearing seat sizing block 10 is arranged on the platform 1 through the third sliding bearing seat sizing block 22.
According to the invention, a sliding rail 12 is fixed in the middle of the right side of a platform 1, the sliding rail 12 is provided with two sliding blocks, the sliding blocks are connected with a sliding bearing seat sizing block I10 through a sliding bearing seat sizing block II 11, a dynamic pressure sliding bearing 20 is installed in the sliding bearing seat sizing block I10 to serve as an experimental bearing, the sliding blocks on the sliding rail 12 can be locked through an adjusting wrench, and the effect of displacement of a fixed bearing along the direction of the sliding rail 12 is achieved when no load is applied so as to meet different experimental requirements.
The lower part of the rolling bearing seat 14 is installed on the platform 1 through a first rolling bearing seat sizing block 15, or the lower part of the rolling bearing seat 14 is installed on the platform 1 through a second rolling bearing seat sizing block 24, a sliding block and a sliding rail 12 in sequence.
As shown in fig. 4, the first eddy current sensor 28 and the second eddy current sensor 35 are supported by the sensor support 21, and the sensor support 21 is disposed on the platform 1 through the aluminum profile support 8.
In the invention, a sensor bracket 21 is arranged at the tail end of an aluminum section bracket 8 through an angle bracket, a first eddy current sensor 28 and a second eddy current sensor 35 are both arranged on the sensor bracket 21, the first eddy current sensor 28 is responsible for measuring the vertical displacement of a main shaft 13, and the second eddy current sensor 35 is responsible for measuring the horizontal displacement of the main shaft 13, so that data such as the axis track of the main shaft 13 can be obtained.
In the invention, the lower surface of the sliding bearing seat sizing block I10 is in a sealing design, specifically, a connecting part for connecting with a sliding bearing seat sizing block II 11 through bolts is arranged on the side surface of the sliding bearing seat sizing block I10, and is connected with the sliding bearing seat sizing block II 11 through bolt holes on the periphery, so that the contact surface of the sliding bearing seat sizing block I10 and the sliding bearing seat sizing block II 11 is sealed, and oil leakage caused by poor bolt sealing is prevented by mounting on a slide rail 12.
The main shaft 13 is provided with an unbalance amount experiment disc 23, and the unbalance amount experiment disc 23 adopts the prior art in the invention.
As a preferred embodiment, the T-shaped groove is fitted with a nut 29 and bolt dedicated to the T-shaped groove, as shown in fig. 8, for fixing the part on the platform 1. Platform 1 is cast iron platform 1, and the T type groove of a plurality of parallel is seted up at 1 top of platform, and the part that needs to fix on platform 1 in the laboratory bench all passes through special nut 29 of T type groove and bolt fastening on platform 1, and as preferred, pass through the bolt fastening between the part that each needs to link firmly in the laboratory bench and the part.
The experiment table can analyze the influence of basic parameters of the bearing on data such as axis track, temperature rise, acceleration and the like by aiming at the dynamic pressure sliding bearing 20 as a research object; the experimental bearing can also be arranged at the position of the supporting bearing, the running condition of the bearing is simulated, and the influence of typical fault misalignment, unbalance and impact collision dynamic load on the system is analyzed. The mounting positions of the rolling bearing seat sizing block I15, the plum blossom coupling 18 and the servo motor I17 are finely adjusted under the working condition of dynamic load to exert the influence of misalignment, an unbalance experiment disc 23 is mounted through a tensioning sleeve 30 and fixed to the tail end, far away from the servo motor I17, of the main shaft 13 to exert the unbalance, and meanwhile the influence of various typical faults on an experiment system is analyzed.
Example one
The influence of the misalignment of the main shaft 13 on the hydrodynamic plain bearing 20 is studied:
as shown in fig. 1 to 5, the middle part of the right side of the platform 1 is fixed with a slide rail 12 with two sliding blocks by a special nut 29 for a T-shaped groove; the sliding block is connected with a second sliding bearing block sizing block 11 through an inner hexagon bolt; the sliding bearing seat sizing block II 11 is connected with the sliding bearing seat sizing block I10 through an inner hexagon bolt; the dynamic pressure slide bearing 20 is installed as the experiment bearing through the hexagon socket head cap screw in the sliding bearing seat sizing block 10, and the upper portion of the dynamic pressure slide bearing 20 is perforated for connecting the oil injection end of the hydraulic pump, providing lubricating oil for the dynamic pressure slide bearing 20, and the lubricating oil flowing out from the dynamic pressure slide bearing 20 flows into the sliding bearing seat sizing block 10, and is recovered through the oil outlet 33 at the front end of the sliding bearing seat sizing block 10.
The two sides of the aluminum profile support 8 are both fixedly provided with a first rolling bearing block washer 15, the first rolling bearing block washer 15 is installed on the platform 1 through a T-shaped groove special nut 29, a first rolling bearing block washer 15 is provided with a rolling bearing seat 14 through a hexagon socket head cap screw, and a deep groove ball bearing 25 is installed inside the rolling bearing seat 14 and serves as a supporting bearing.
A motor support 16 is fixed on one side of a rolling bearing seat sizing block I15, the motor support 16 is installed on the platform 1 through a T-shaped groove special nut 29, and a servo motor I17 is installed on the motor support 16 and serves as a driving motor for rotation of an experimental shaft (namely a main shaft 13 and a linear optical axis); the first servo motor 17 is connected with the main shaft 13 through a plum coupling 18, and the main shaft 13 penetrates through the two supporting bearings and the middle experimental bearing.
The servo electric cylinder sizing block I2 is fixed on one side of the platform 1 through a T-shaped groove special nut 29, the servo electric cylinder 4 is fixed on the servo electric cylinder sizing block I2 through an inner hexagonal bolt, the tail end of the servo electric cylinder 4 is connected with a servo motor II 3, the servo motor II 3 serves as a driving motor for applying load, a lifting lug I5 is connected to the front end of the servo electric cylinder 4, the lifting lug I5 is connected with a connecting ring I6 at one end of a spring damper 7, a connecting ring II 27 at the other end of the spring damper 7 is connected with a lifting lug II 26 mounted in the middle of the spoke type pressure sensor 19, the spoke type pressure sensor 19 is mounted at the tail end of a sliding bearing sizing block I10 through the inner hexagonal bolt, the spring damper 7 is connected between a load applying system and an experimental bearing system, and the influence of vibration of the experimental bearing system on the applied load and dynamic load is reduced through a spring damping adding mode.
The mounting positions of the two rolling bearing seat sizing blocks I15, the plum blossom-shaped coupler 18 and the servo motor I17 are finely adjusted to change experimental parameters, and the influence of the misalignment condition of the main shaft 13 on the dynamic pressure sliding bearing 20 is researched to be closer to the use of the bearing in the actual working condition.
During the experiment, the locking nut on the sliding block of the sliding rail 12 is locked by adjusting the wrench to fix the sliding block and the sliding rail 12, so that no relative displacement exists between the sliding rail 12 and the sliding block.
Example two
The influence of the unbalance applied to the main shaft 13 on the sliding bearing rotor system formed by coupling the dynamic pressure sliding bearing 20 and the main shaft 13 is studied:
as shown in fig. 6, on the basis of the experiment table structure of the first embodiment, the bolt connection between the spoke type pressure sensor 19 and the sliding bearing seat sizing block i 10 is disconnected, the support bearing system far away from the servo motor i 17 is removed, the experiment bearing system is moved to the position far away from the servo motor i 17, the sliding bearing seat sizing block i 11, the sliding block and the sliding rail 12 are removed, the experiment bearing system is installed on the sliding bearing seat sizing block i 22 through bolts, and the sliding bearing seat sizing block i 22 is installed on the platform 1 through the special nut 29 for the T-shaped groove. The experimental bearing system is arranged at the position of the support bearing, is closer to the working condition of the dynamic pressure sliding bearing 20 in actual work, and more accurately analyzes the data of the whole system.
Two unbalance experiment discs 23 are arranged in the middle of the main shaft 13 through a tensioning sleeve 30, experiment parameters are changed by changing the installation positions and the number of bolts of the unbalance experiment discs 23, and the influence of the unbalance on a sliding bearing rotor system under different conditions is analyzed.
EXAMPLE III
The influence of dynamic load applied to the rolling bearing on the sliding bearing rotor system formed by coupling the dynamic pressure sliding bearing 20 and the main shaft 13 was studied:
as shown in fig. 7, on the basis of the experimental bench structure of the first embodiment, the bolt connection between the spoke type pressure sensor 19 and the sliding bearing pedestal sizing block one 10 is disconnected, and the position of the supporting bearing system far away from the servo motor one 17 is exchanged with the position of the experimental bearing system; the experimental bearing system is provided with a second sliding bearing seat sizing block 11, a sliding block and a sliding rail 12 which are removed, and is arranged on the platform 1 through a third sliding bearing seat sizing block 22 by using a T-shaped groove special nut 29; and the support bearing system far away from the servo motor I17 is provided with a first rolling bearing seat sizing block 15 which is then connected to a sliding block of the sliding rail 12 through a second rolling bearing seat sizing block 24, and the sliding rail 12 is arranged on the platform 1 through a T-shaped groove special nut 29.
All parts between the spoke type pressure sensor 19 and the servo motor II 3 are translated to the side face of the support bearing system on the sliding rail 12, and a servo electric cylinder sizing block I2 below the servo electric cylinder 4 is replaced by a servo electric cylinder sizing block II 31 for being matched with the height of the support bearing system; the spoke type pressure sensor 19 is connected with the second rolling bearing seat sizing block 24 through the inner hexagon bolt, and the influence of applied load or dynamic load is researched by controlling the change of experimental parameters through the second servo motor 3.
In the basic parameters of the experimental bearing, the rotating speed can be realized by controlling the first servo motor 17 through the controller, the length-diameter ratio, the eccentricity and the offset can be changed by replacing different dynamic pressure sliding bearings 20 and adding gaskets, the load and the dynamic load can be applied through the second servo motor 3, and the experiments of the kinematic viscosity, multiphase flow, particulate matters and the like of the lubricating oil can be realized by changing the brand of the lubricating oil, adding the particulate matters and the like.
The experiment table disclosed by the invention uses a large number of standard components, is simple in structure, high in strength and good in adaptability, and can replace different parts to meet different experiment requirements. A spring shock absorber 7 is arranged between the servo electric cylinder 4 and the spoke type pressure sensor 19, and the influence of the vibration of an experimental system on the servo electric cylinder 4 in an experiment is reduced by adding a spring damping mode, so that the stability of applied load or dynamic load is ensured. The servo electric cylinder 4 is used for replacing the traditional hydraulic station to apply load and dynamic load, the response is rapid, the hydraulic station is clean and sanitary, the size is small, and the complexity of using the hydraulic station is avoided. The double-span type supporting structure ensures the stability of the applied dynamic load. The basic parameters of the bearing and the effects of typical faults are coupled together, and the influence change of the experimental bearing is analyzed. The experimental data can reflect the problems of the dynamic pressure sliding bearing 20 in operation, can effectively ensure that the performance parameters such as the axis track, oil film pressure, distribution, temperature rise, rigidity and damping are close to reality in the experimental process, and provide instructive experimental data for engineering application.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A double-span dynamic pressure sliding bearing experiment table capable of applying dynamic load is characterized by comprising a platform, an experiment bearing system, a supporting bearing system and an experiment shaft rotating system, wherein the experiment bearing system, the supporting bearing system and the experiment shaft rotating system are arranged on the platform;
the platform is provided with a plurality of T-shaped grooves;
the experimental bearing system comprises a first sliding bearing seat sizing block, and an experimental bearing is arranged in the first sliding bearing seat sizing block;
the support bearing system comprises a rolling bearing seat and a support bearing arranged in the rolling bearing seat;
the experiment shaft rotating system comprises a first servo motor and a main shaft connected with the first servo motor, and the main shaft penetrates through the experiment bearing and the supporting bearing.
2. The dual-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to claim 1, further comprising a load applying system, wherein the load applying system comprises a second servo motor and a servo electric cylinder connected with the second servo motor, and the servo electric cylinder is connected with the experiment bearing or the support bearing through a spring damper.
3. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to claim 2, wherein the servo electric cylinder is connected with the experiment bearing through a spring damper and is specifically configured as follows: the servo electric cylinder is arranged on the platform through a first servo electric cylinder sizing block, the front end of the servo electric cylinder is connected with a first lifting lug, the first lifting lug is connected with a first connecting ring at one end of a spring shock absorber, a second connecting ring at the other end of the spring shock absorber is connected with a second lifting lug on a spoke type pressure sensor, and the spoke type pressure sensor is arranged on a first sliding bearing seat sizing block;
the servo electric cylinder is connected with the supporting bearing through the spring shock absorber and is specifically set as follows: the servo electric cylinder is arranged on the platform through a servo electric cylinder sizing block II, a first lifting lug is connected to the front end of the servo electric cylinder, the first lifting lug is connected with a first connecting ring at one end of a spring damper, a second connecting ring at the other end of the spring damper is connected with a second lifting lug on a spoke type pressure sensor, and the spoke type pressure sensor is arranged on a second rolling bearing seat sizing block.
4. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic load according to claim 3, wherein the upper part of the experiment bearing is provided with a fine threaded hole for connecting an oil filling end of a hydraulic pump; and a coarse thread threaded hole is formed in the side part of the experimental bearing and used for mounting a temperature sensor.
5. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to any one of claim 4, further comprising a control system, wherein the control system comprises a computer, and a controller and a signal acquisition card connected with the computer;
the controller is respectively connected with the first servo motor and the second servo motor and is used for controlling the first servo motor and the second servo motor to work;
the signal acquisition card is respectively connected with the first eddy current sensor, the second eddy current sensor, the spoke type pressure sensor and the temperature sensor, and the first eddy current sensor and the second eddy current sensor acquire main shaft linear displacement or experimental bearing linear displacement data and send the data to a computer for displaying, recording and storing; the spoke type pressure sensor collects tension data applied by the servo electric cylinder and sends the tension data to a computer for displaying, recording and storing; the temperature sensor collects temperature data of the experimental bearing and sends the temperature data to the computer for displaying, recording and storing.
6. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to any one of claims 1 to 5, wherein the lower part of the first sliding bearing pedestal sizing block is arranged on the platform sequentially through a second sliding bearing pedestal sizing block, a sliding block and a sliding rail, or the lower part of the first sliding bearing pedestal sizing block is arranged on the platform through a third sliding bearing pedestal sizing block.
7. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to any one of claims 1 to 5, wherein the lower part of the rolling bearing seat is mounted on the platform through a first rolling bearing seat sizing block, or the lower part of the rolling bearing seat is mounted on the platform through a second rolling bearing seat sizing block, a sliding block and a sliding rail in sequence.
8. The double-straddle dynamic pressure sliding bearing experiment table capable of applying dynamic loads according to claim 5, wherein the first eddy current sensor and the second eddy current sensor are supported by a sensor support, and the sensor support is arranged on the platform through an aluminum profile support.
9. The double-straddle dynamic pressure sliding bearing test bed according to any one of claims 1 to 5, wherein a lower surface of the sliding bearing chock is of a sealing design.
10. The double-straddle dynamic pressure sliding bearing test bed according to claim 1, wherein the main shaft is provided with an unbalance test disk.
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