A tilting pad sliding bearing test box, test bench and test method

Abstract

The invention discloses a tilting pad sliding bearing test box, a test bench and a test method, comprising a bearing test box, the bearing test box comprising a box body, a hollow input shaft supported on the box body, a sliding bearing seat fixed in the box body by a fixed steel cable, a tilting pad sliding bearing mounted on the sliding bearing seat and sleeved outside the hollow input shaft, a hydraulic loader for applying a load to the sliding bearing seat, a strain gauge film embedded in the outer circular wall of the hollow input shaft, a wireless strain node fixed in the hollow input shaft and connected to the strain gauge film by a wire, and an oil injection device for injecting lubricating oil into the sliding bearing seat. The test bench comprises a hydraulic controller, a high-frequency collector, a speed measuring device, a frequency converter, a test computer, and a driving motor, a torque meter, a speed increaser and a bearing test box that are sequentially connected in transmission. The test platform can realize the transient pressure and distribution of the oil film of the tilting pad sliding bearing under different speeds and load conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of test benches, and in particular relates to a tilting pad sliding bearing test box, a test bench and a test method. Background Art

[0002] Sliding bearing test benches can be divided into two types based on the installation method: upright type and inverted type.

[0003] The upright test bench uses the experimental bearings as the bearings at both ends of the main shaft, and the auxiliary rolling bearings as the loading bearings in the middle. The purpose of the upright test of the experimental bearing is to simulate the actual engineering environment to test the vibration response characteristics of the experimental bearings, and to further test the vibration reduction performance of the experimental bearings by comparing with ordinary round bearings. First, a stable rotating spindle working environment is built, and then the loading device is used to control the relative movement of the experimental bearings to the main shaft to achieve the generation of oil film bearing capacity, and then the load and speed are controlled to meet the requirements of different experimental working conditions, and then the performance of the experimental bearings such as oil film temperature rise, oil film pressure, stiffness coefficient and damping coefficient are studied.

[0004] The inverted test bench uses the experimental bearing as the loading bearing, and the auxiliary rolling bearings as the supporting bearings at both ends of the main shaft. The purpose of the inverted test is to test the basic performance of the experimental bearings: load factor, temperature rise, eccentricity, stiffness coefficient and damping coefficient, etc. The test bench simulates the large-scale rotating mechanical structure in industry to build a floating support rotor system, and then controls the rolling loading bearing to load the main shaft to achieve the generation of load-bearing capacity, and then controls the load and speed to meet the requirements of different experimental working conditions, and then studies and detects the dynamic characteristics of the rotor system and the vibration reduction performance of the two experimental bearings.

[0005] The above two test benches are currently common sliding bearing test benches. The main difference between them is whether the experimental bearing is installed at both ends or in the middle loading position. At present, the two types of test benches are similar in the way of installing pressure sensors, both of which are installed on the tiles of the sliding bearing. For fixed-type sliding bearings, this method can meet the test requirements. However, there are some problems when applied to tilting pad sliding bearings. Since the tiles of the tilting pad sliding bearing are floating, the pressure sensor signal line will affect the movement state of the tiles, causing the oil film thickness to change, thereby causing interference to the tested oil film pressure. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a tilting pad sliding bearing test box, a test bench and a test method for measuring the transient pressure and distribution of the tilting pad sliding bearing oil film under different speeds and load conditions.

[0007] The technical solution adopted by the present invention is as follows: a tilting pad sliding bearing test box, including a bearing test box, wherein the bearing test box includes a box body, a hollow input shaft supported on the box body, a sliding bearing seat fixed in the box body by a fixed steel cable, a tilting pad sliding bearing installed on the sliding bearing seat and sleeved outside the hollow input shaft, a hydraulic loader for applying a load to the sliding bearing seat, a strain gauge film embedded in the outer cylindrical wall of the hollow input shaft, a wireless strain node fixed in the hollow input shaft and connected to the strain gauge film by a wire, and an oil injection device for injecting lubricating oil into the sliding bearing seat.

[0008] Furthermore, the base of the hydraulic loader is fixed on the box body, and the loading end of the hydraulic loader is fixedly connected to the top of the sliding bearing seat.

[0009] Furthermore, the oil injection device is a hydraulic pump, and the hydraulic pump injects lubricating oil into the sliding bearing seat through an oil pipe.

[0010] Furthermore, it also includes a rotation speed measuring device for detecting the rotation speed of the hollow input shaft.

[0011] Furthermore, the rotation speed measuring device includes a gear and a Hall sensor for sensing the rotation speed of the gear, and the gear is installed at the rear end of the hollow input shaft.

[0012] The second object of the present invention is to provide a tilting pad sliding bearing test bench, comprising a hydraulic controller, a high-frequency collector, a speed measuring device, a frequency converter, a test computer, and a drive motor, a torque meter, a speed increaser and a bearing test box which are sequentially connected in transmission. The bearing test box is the above-mentioned tilting pad sliding bearing test box, the hydraulic controller is connected to the hydraulic loader, the high-frequency collector is respectively connected to the torque meter and the speed measuring device, the frequency converter is connected to the drive motor, the hydraulic controller, the high-frequency collector and the frequency converter are all connected to the test computer, and the wireless strain node and the test computer are connected via wireless signals.

[0013] Furthermore, the speed increaser includes a speed increaser body, an input shaft, a first large gear, a first small gear, a first rotating shaft, a second large gear, a second small gear, a second rotating shaft, a third small gear, and an output shaft; the input shaft, the first rotating shaft, the second rotating shaft and the output shaft are all supported on the speed increaser body, the input shaft and the output shaft are coaxially arranged, the first large gear is fixedly mounted on the input shaft, the first small gear and the second large gear are both fixedly mounted on the first rotating shaft, the second small gear is sleeved on the second rotating shaft, the third small gear is fixedly mounted on the output shaft, the first large gear and the first small gear are meshed for transmission, and the second large gear, the second small gear and the third small gear are meshed for transmission in sequence.

[0014] Furthermore, the driving motor and the torque meter are connected via a first coupling, the torque meter and the speed increasing box are connected via a second coupling, and the hollow input shaft and the speed increasing box are connected via a third coupling.

[0015] Furthermore, the rotation speed measuring device includes a gear and a Hall sensor for sensing the rotation speed of the gear, and the gear is installed at the rear end of the hollow input shaft.

[0016] A third object of the present invention is to provide a method for testing a tilting pad sliding bearing test bench, which is implemented in the above-mentioned test bench and comprises the following steps:

[0017] (1) The test computer controls the speed of the drive motor through the frequency converter. The power of the drive motor is successively input into the hollow input shaft of the bearing test box through the torque meter and the speed increaser.

[0018] (2) The torque meter collects the output torque data of the drive motor in real time, and the speed measuring device collects the real-time speed data of the hollow input shaft in real time. The torque meter and the speed measuring device transmit the collected data to the high-frequency collector, and the high-frequency collector transmits the data to the test computer; the wireless strain node collects the oil film pressure data through the strain gauge film and transmits the data to the test computer via wireless;

[0019] (3) The test computer controls the hydraulic loader through the hydraulic controller, and the hydraulic loader applies a load to the sliding bearing seat, thereby realizing the transient pressure and distribution of the oil film of the tilting pad sliding bearing under different speeds and load conditions.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Since the pads of the tilting pad sliding bearing are in a floating state, it is not conducive to the installation of the pressure sensor. In the present invention, a strain gauge film is embedded in the outer cylindrical wall of the hollow input shaft. The strain gauge film is connected to the wireless strain node through a wire, and then the wireless strain node is implanted into the hollow input shaft. The strain data generated by the oil film pressure is transmitted to the test computer through a wireless signal, and the transient pressure value and pressure distribution state of the oil film are tested after calibration and conversion.

[0022] 2. The present invention utilizes a speed increaser design to increase the speed of the drive motor to the high speed required for the test, utilizes a torque meter, gears and Hall sensors to monitor the output torque of the drive motor and the real-time speed value of the hollow input shaft, and utilizes a hydraulic controller and a hydraulic loader to achieve precise load loading. The above design achieves different speed and load conditions.

[0023] 3. The present invention utilizes a fixed steel cable to install the sliding bearing seat in the bearing test box. Since the steel cable has good flexibility, it can eliminate the high-frequency vibration generated by the transmission system and avoid the change of the sliding bearing oil film thickness caused by vibration, thereby ensuring the accuracy of the oil film pressure test.

[0024] 4. The present invention collects the signals of the frequency converter, high-frequency acquisition instrument and hydraulic controller on a test computer, which is convenient for processing the information of the drive motor, hydraulic loader, torque meter, Hall sensor and wireless strain node on the same platform to ensure the consistency of information. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a bearing test box;

[0026] Figure 2 It is a schematic diagram of the installation of wireless strain nodes;

[0027] Figure 3 It is a structural schematic diagram of the test bench of the present invention;

[0028] Figure 4 It is the structure diagram of the speed increaser;

[0029] In the figure: drive motor 1, first coupling 2, torque meter 3, second coupling 4, speed increaser 5, third coupling 6, hollow input shaft 7, hydraulic loader 8, fixed steel cable 9, wireless strain node 10, gear 11, Hall sensor 12, tilting pad sliding bearing 13, sliding bearing seat 14, bearing test box 15, hydraulic pump 16, hydraulic controller 17, high-frequency collector 18, test computer 19, inverter 20; input shaft 21, first large gear 22, first small gear 23, first rotating shaft 24, second large gear 25, second small gear 26, second rotating shaft 27, third small gear 28, output shaft 29, strain gauge film 30, lubricating oil 31, wire 32. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. In the following description and drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the attached claims. The various embodiments of this specification are described in a progressive manner.

[0031] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] Embodiment 1:

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a tilting pad sliding bearing test box, including a bearing test box 15, wherein the bearing test box 15 includes a box body, a hollow input shaft 7 supported on the box body, a sliding bearing seat 14 fixed in the box body by a fixing steel cable 9, a tilting pad sliding bearing 13 installed on the sliding bearing seat 14 and sleeved outside the hollow input shaft 7, a hydraulic loader 8 for applying a load to the sliding bearing seat 14, a strain gauge film 30 embedded in the outer cylindrical wall of the hollow input shaft 7, a wireless strain node 10 fixed in the hollow input shaft 7 and connected to the strain gauge film 30 through a wire 32, and an oil injection device for injecting lubricating oil 31 into the sliding bearing seat 14.

[0035] Since the fixing steel cable 9 has good flexibility, the high-frequency vibration generated by the transmission system can be eliminated, and the change of the oil film thickness of the tilting pad sliding bearing 13 caused by the vibration can be avoided, thereby ensuring the accuracy of the oil film pressure test.

[0036] The strain gauge film 30 is embedded in the outer circumferential wall of the hollow input shaft 7 (i.e., a groove is first machined on the outer circumferential wall of the hollow input shaft 7, a hole is opened in the groove, the hole passes through the side wall of the hollow input shaft 7 for the wire 32 to pass through, and then the strain gauge film 30 is pasted in the groove), which is conducive to measuring the oil film pressure distribution around the tilting pad sliding bearing 13 through the strain gauge film 30.

[0037] The wireless strain node 10 is fixed in the hollow input shaft 7 and connected to the strain gauge film 30 through the wire 32. This method is conducive to transmitting the signal of the strain gauge film 30 to the test computer 19 by wireless mode when the hollow input shaft 7 rotates at a high speed. The wireless strain node 10 can adopt the SG403 / SG404 wireless strain node of Beijing BiChuang Technology Co., Ltd., but is not limited thereto.

[0038] In the embodiment of the present application, the base of the hydraulic loader 8 is fixed on the box body, the hydraulic loader 8 is integrated with a hydraulic pump and a hydraulic cylinder, the loading end of the hydraulic loader 8 is fixedly connected to the top of the sliding bearing seat 14, and the loading of the sliding bearing seat 14 is achieved through the hydraulic loader 8.

[0039] In the embodiment of the present application, the oil injection device is a hydraulic pump 16 , and the hydraulic pump 16 injects lubricating oil 31 into the sliding bearing seat 14 through an oil pipe.

[0040] In the embodiment of the present application, a speed measuring device for detecting the speed of the hollow input shaft 7 is also included. Further, the speed measuring device includes a gear 11 and a Hall sensor 12 for sensing the speed of the gear, and the gear 11 is installed at the rear end of the hollow input shaft 7.

[0041] Embodiment 2:

[0042] like Figure 3 As shown, the present invention also provides a tilting pad sliding bearing 13 test bench, including a hydraulic controller 17, a high-frequency collector 18, a speed measuring device, a frequency converter 20, a test computer 19, and a drive motor 1, a torque meter 3, a speed increaser 5 and a bearing test box 15 which are sequentially connected in transmission. The bearing test box 15 is the tilting pad sliding bearing 13 test box of Example 1, the hydraulic controller 17 is connected to the hydraulic loader 8, the high-frequency collector 18 is respectively connected to the torque meter 3 and the speed measuring device, the frequency converter 20 is connected to the drive motor 1, the hydraulic controller 17, the high-frequency collector 18 and the frequency converter 20 are all connected to the test computer 19, and the wireless strain node 10 and the test computer 19 are connected via wireless signals.

[0043] In the embodiment of the present application, the speed increasing box 5 is designed to increase the speed of the driving motor 1 to the high speed required for the test, such as Figure 4 As shown, the speed increaser 5 includes a speed increaser 5 body, an input shaft 21, a first large gear 22, a first pinion 23, a first rotating shaft 24, a second large gear 25, a second pinion 26, a second rotating shaft 27, a third pinion 28, and an output shaft 29; the input shaft 21, the first rotating shaft 24, the second rotating shaft 27 and the output shaft 29 are all supported on the speed increaser 5 body, the input shaft 21 and the output shaft 29 are coaxially arranged, the first large gear 22 is fixedly mounted on the input shaft 21, the first pinion 23 and the second large gear 25 are both fixedly mounted on the first rotating shaft 24, the second pinion 26 is sleeved on the second rotating shaft 27, the third pinion 28 is fixedly mounted on the output shaft 29, the first large gear 22 and the first pinion 23 are meshed for transmission, and the second large gear 25, the second pinion 26 and the third pinion 28 are meshed for transmission in sequence.

[0044] In the embodiment of the present application, the drive motor 1 and the torque meter 3 are connected through the first coupling 2, the torque meter 3 and the speed increaser 5 are connected through the second coupling 4, and the hollow input shaft 7 and the speed increaser 5 are connected through the third coupling 6. This method facilitates equipment installation, debugging and maintenance.

[0045] In the embodiment of the present application, the rotation speed measuring device includes a gear and a Hall sensor 12 for sensing the rotation speed of the gear, and the gear is installed at the rear end of the hollow input shaft 7.

[0046] The present invention also provides a testing method for a tilting pad sliding bearing 13 testing bench, which is implemented in the above-mentioned test bench and comprises the following steps:

[0047] (1) The test computer 19 controls the speed of the drive motor 1 through the frequency converter 20. The power of the drive motor 1 is successively input into the hollow input shaft 7 of the bearing test box 15 through the torque meter 3 and the speed increaser 5;

[0048] (2) The torque meter 3 collects the output torque data of the drive motor 1 in real time, and the speed measuring device collects the real-time speed data of the hollow input shaft 7 in real time. The torque meter 3 and the speed measuring device transmit the collected data to the high-frequency collector 18, and the high-frequency collector 18 transmits the data to the test computer 19; the wireless strain node 10 collects the oil film pressure data through the strain gauge film 30, and transmits the data to the test computer 19 via wireless;

[0049] (3) The test computer 19 controls the hydraulic loader 8 through the hydraulic controller 17, and the hydraulic loader 8 applies a precise load to the sliding bearing seat 14, thereby realizing the transient pressure and distribution of the oil film of the tilting pad sliding bearing 13 under different speeds and load conditions.

[0050] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A tilting pad bearing test box, characterized in that: The invention comprises a bearing test box, which comprises a box body, a hollow input shaft supported on the box body, a sliding bearing seat fixed in the box body by a fixed steel cable, a tilting pad sliding bearing installed on the sliding bearing seat and sleeved outside the hollow input shaft, a hydraulic loader for applying load to the sliding bearing seat, a strain gauge film embedded in the outer cylindrical wall of the hollow input shaft, a wireless strain node fixed in the hollow input shaft and connected to the strain gauge film by a wire, and an oil injection device for injecting lubricating oil into the sliding bearing seat; the pad of the tilting pad sliding bearing is in a floating state and needs to be embedded in the outer cylindrical wall of the hollow input shaft by a strain gauge film, the strain gauge film is connected to the wireless strain node by a wire, and then the wireless strain node is implanted in the hollow input shaft, and the strain data generated by the oil film pressure is transmitted to the test computer by a wireless signal, and the transient pressure value and pressure distribution state of the oil film are tested after calibration and conversion.

2. A tilting pad bearing test box according to claim 1, characterized in that: The base of the hydraulic loader is fixed on the box body, and the loading end of the hydraulic loader is fixedly connected to the top of the sliding bearing seat.

3. The tilting pad bearing test box according to claim 1, characterized in that: The oil injection device is a hydraulic pump.

4. The tilting pad bearing test box according to claim 1, characterized in that: The utility model also comprises a rotation speed measuring device for detecting the rotation speed of the hollow input shaft.

5. A tilting pad bearing test box according to claim 4, characterized in that: The rotation speed measuring device comprises a gear and a Hall sensor for sensing the rotation speed of the gear, and the gear is installed at the rear end of the hollow input shaft.

6. A tilting pad sliding bearing test bench, characterized in that: It includes a hydraulic controller, a high-frequency collector, a speed measuring device, a frequency converter, a test computer, and a drive motor, a torque meter, a speed increaser and a bearing test box which are sequentially connected in transmission. The bearing test box is a tilting pad sliding bearing test box as described in any one of claims 1 to 3. The hydraulic controller is connected to the hydraulic loader, the high-frequency collector is respectively connected to the torque meter and the speed measuring device, the frequency converter is connected to the drive motor, the hydraulic controller, the high-frequency collector and the frequency converter are all connected to the test computer, and the wireless strain node and the test computer are connected via wireless signals.

7. A tilting pad sliding bearing test bench according to claim 6, characterized in that: The speed increaser includes a speed increaser body, an input shaft, a first large gear, a first small gear, a first rotating shaft, a second large gear, a second small gear, a second rotating shaft, a third small gear, and an output shaft; the input shaft, the first rotating shaft, the second rotating shaft and the output shaft are all supported on the speed increaser body, the input shaft and the output shaft are coaxially arranged, the first large gear is fixedly mounted on the input shaft, the first small gear and the second large gear are both fixedly mounted on the first rotating shaft, the second small gear is sleeved on the second rotating shaft, the third small gear is fixedly mounted on the output shaft, the first large gear and the first small gear are meshed for transmission, and the second large gear, the second small gear and the third small gear are meshed for transmission in sequence.

8. The tilting pad sliding bearing test bench according to claim 6, characterized in that: The driving motor and the torque meter are connected via a first coupling, the torque meter and the speed increasing box are connected via a second coupling, and the hollow input shaft and the speed increasing box are connected via a third coupling.

9. The tilting pad sliding bearing test bench according to claim 6, characterized in that: The rotation speed measuring device comprises a gear and a Hall sensor for sensing the rotation speed of the gear, and the gear is installed at the rear end of the hollow input shaft.

10. A testing method for a tilting pad sliding bearing test bench, characterized in that: The method is implemented in the test bench described in claim 6, and the method comprises the following steps: (1) The test computer controls the speed of the drive motor through the frequency converter. The power of the drive motor is successively input into the hollow input shaft of the bearing test box through the torque meter and the speed increaser. (2) The torque meter collects the output torque data of the drive motor in real time, and the speed measuring device collects the real-time speed data of the hollow input shaft in real time. The torque meter and the speed measuring device transmit the collected data to the high-frequency collector, and the high-frequency collector transmits the data to the test computer; the wireless strain node collects the oil film pressure data through the strain gauge film and transmits the data to the test computer via wireless; (3) The test computer controls the hydraulic loader through the hydraulic controller, and the hydraulic loader applies a load to the sliding bearing seat, thereby realizing the transient pressure and distribution of the oil film of the tilting pad sliding bearing under different speeds and load conditions.

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