A multi-span multi-functional comprehensive experimental platform and method for a faulty rotor system

Abstract

The present invention relates to a multi-span multi-functional fault rotor system comprehensive test bench and method, which includes a base. A channel steel base one and a channel steel base two are fixed on the base. A dovetail groove guide rail is installed on the channel steel base one. A rectangular positioning groove is provided on the dovetail groove guide rail. A lead screw transmission mechanism is slidably connected through a positioning slider. A gasket is arranged between the lead screw transmission mechanism and the dovetail groove guide rail. A chuck type bearing seat assembly is threadedly connected to each lead screw transmission mechanism. A rubbing support mechanism is arranged between every two adjacent chuck type bearing assemblies. A rotating shaft sequentially passes through the chuck type bearing seat assembly and the rubbing support mechanism and is connected and fixed through a bearing sleeve, a bearing and a bearing snap ring. A vibration sensor is installed on the bearing sleeve. The present invention can simulate a comprehensive test bench for rotor misalignment, imbalance, rubbing and their compound faults, and has positive significance for the fault experiment simulation and later research of rotating machinery.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotating machinery fault diagnosis, and particularly relates to a multi-span multi-functional fault rotor system comprehensive test bench and method. Background Art

[0002] The multi-span multi-functional fault rotor system comprehensive test bench takes the discs and rolling bearings connected to the rotating shaft as the main research objects. The experimental test system uses testing and sensor technologies to collect, record, and analyze various experimental vibration phenomena of the rotor system, and finally obtains experimental results to verify the correctness of theoretical calculations. Designing a fault rotor system test bench is an important means for qualitatively and quantitatively analyzing the influence of faults in the rotor system and is also a necessary method for studying the fault action mechanism. To simulate the structure of a complex rotor system, it is necessary to design a fault rotor system with multiple spans and multiple fault categories so that it can simulate various fault forms in a complex rotor system. In the development of the research and innovation of rotor test benches in recent years, domestic researchers have made some innovations in the structure and function design of the test benches. However, since the designed functions of these rotor test benches are mainly for teaching purposes and the simulated fault forms are single, the experimental functions of the test benches are limited and it is difficult to meet the requirements of various vibration experiments. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a multi-span multi-functional fault rotor system comprehensive test bench and method. This test bench is a comprehensive test bench that can simulate rotor misalignment, imbalance, rub-impact, and their combined faults, and has positive significance for the fault experiment simulation and subsequent research of rotating machinery.

[0004] A multi-span multi-functional fault rotor system comprehensive test bench, including a base, on which a channel steel base one and a channel steel base two are fixed. A dovetail groove guide rail is installed on the upper part of the channel steel base one. A dovetail groove is provided on the dovetail groove guide rail, and a dovetail slider is slidably connected in the dovetail groove; a rectangular positioning groove for centering and positioning is provided on the dovetail groove guide rail, and a plurality of lead screw drive mechanisms for lateral displacement adjustment are slidably connected to the rectangular positioning groove through positioning sliders. The plurality of lead screw drive mechanisms are arranged side by side along the sliding direction of the rectangular positioning groove, and the lead screw drive mechanism is fixed to the dovetail slider; a gasket for adjusting longitudinal displacement is provided between the lead screw drive mechanism and the dovetail groove guide rail; a chuck type bearing seat assembly is threadedly connected to each lead screw drive mechanism; a rubbing support mechanism for adjusting the rubbing amount is provided between every two adjacent chuck type bearing assemblies, and the rubbing support mechanism is fixed to the dovetail slider in the dovetail groove track through screws; a rotating shaft sequentially passes through the chuck type bearing seat assembly on the lead screw drive mechanism and the rubbing support mechanism and is connected and fixed through a bearing sleeve, a bearing and a bearing snap ring. A vibration sensor is installed on the bearing sleeve and is electrically connected to the vibration data acquisition device of the rotor system; a motor base is installed on the channel steel base two, a motor and a frequency converter connected to the motor are fixed on the motor base, and the rotating shaft is connected to the output end of the motor through a coupling one.

[0005] The upper surface of the dovetail slider is lower than the upper surface of the dovetail groove guide rail.

[0006] A threaded hole one is provided on the dovetail slider, a bolt hole is provided on the lead screw drive mechanism, and the lead screw drive mechanism and the dovetail slider are fixed by inserting screws into the bolt hole and the threaded hole one.

[0007] A lock washer is provided at the bottom of the dovetail slider.

[0008] Three lead screw drive mechanisms are slidably connected to the rectangular positioning groove.

[0009] The chuck type bearing seat assembly includes a chuck connection frame, a central hole is provided in the middle of the chuck connection frame, and a groove is provided at the bottom of the chuck connection base corresponding to the center position of its central hole; a three-jaw chuck is connected to the side of the chuck connection frame, the bearing sleeve, the bearing and the bearing snap ring are clamped on the three-jaw chuck from the outside to the inside, and the rotating shaft is fixed in the bearing snap ring; the chuck connection frame is threadedly connected to the lead screw drive mechanism.

[0010] The lead screw drive mechanism includes a servo motor, a coupling II, a lead screw, a chuck connection base, and a measurement knob. The lead screw is connected to the output end of the servo motor through the coupling II, and the measurement knob is connected to the other end of the lead screw. The chuck connection frame is threadedly connected to the lead screw. A dovetail-shaped convex block is arranged at the bottom of the chuck connection frame in a direction parallel to the lead screw and is matched with the dovetail-shaped groove on the chuck connection base to achieve the sliding connection between the chuck connection frame and the chuck connection base. The sliding direction of the chuck connection frame relative to the chuck connection base is parallel to the axial direction of the lead screw and perpendicular to the sliding direction of the dovetail slider.

[0011] The method for conducting experiments on the above-mentioned multi-span multi-functional faulty rotor system comprehensive test bench specifically includes the following steps:

[0012] (1) Rotor misalignment fault experiment

[0013] Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the coupling II, bearing snap ring, and disc snap ring connected to the motor, and take off the rotating shaft, bearing, bearing snap ring, and bearing sleeve.

[0014] Step 2: Connect the chuck connection base to the rectangular groove on the dovetail groove guide through the positioning slider to achieve the positioning of the alignment state.

[0015] Step 3: Install the bearing sleeve, bearing, and bearing snap ring in each chuck-type bearing assembly on the rotating shaft in sequence and tighten the fixed disc snap ring and bearing snap ring. After aligning and connecting the rotating shaft and the motor, tighten the coupling I. According to the experimental requirements, slide the position of the dovetail slider to determine the axial position of the chuck-type bearing assembly.

[0016] Step 4: Turn on the servo motor, adjust the required lateral offset through the lead screw and the measurement knob, and then add gaskets with different thicknesses at the connection between the chuck connection frame and the chuck connection base to set the required longitudinal offset. Finally, tighten the chuck connection base and the dovetail slider with screws; then run the motor and adjust the motor speed through the frequency converter according to the experimental requirements to conduct the experiment.

[0017] (2) Rotor imbalance fault experiment

[0018] Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the coupling II, bearing snap ring, and disc snap ring connected to the motor, and take off the rotating shaft, bearing, bearing snap ring, and bearing sleeve.

[0019] Step 2: Connect the chuck connection base to the rectangular groove on the dovetail groove guide through the positioning slider to achieve the positioning of the alignment state.

[0020] Step 3: Install the bearing sleeves, bearings, bearing snap rings in each chuck-type bearing assembly and the rubbing support mechanism between the chuck-type bearing assemblies on the shaft in sequence, tighten the fixed disc snap ring and the bearing snap ring, align and connect the rotating shaft with the motor, then tighten the first coupling, and slide the position of the dovetail slider according to the experimental requirements to determine the axial position of the chuck-type bearing assembly;

[0021] Step 4: Determine the number of counterweight screws according to the unbalance amount required for the experiment, install the required counterweight screws at the threaded hole positions of the disc in the rubbing support mechanism to adjust the rotor unbalance amount, then run the motor, and adjust the motor speed according to the experimental requirements through the frequency converter to conduct the experiment;

[0022] (3) Rubbing experiment

[0023] Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the second coupling, bearing snap ring and disc snap ring connected to the motor, and take off the rotating shaft, bearing, bearing snap ring and bearing sleeve;

[0024] Step 2: Connect the chuck connection base with the rectangular groove on the dovetail groove guide through the positioning slider to realize the positioning of the centering state;

[0025] Step 3: Install the bearing sleeves, bearings, bearing snap rings in each chuck-type bearing assembly and the rubbing support mechanism between the chuck-type bearing assemblies in sequence, tighten the fixed disc snap ring, bearing snap ring and the first coupling, and slide the position of the dovetail slider according to the experimental requirements to determine the axial position of the chuck-type bearing assembly;

[0026] Step 4: Adjust the feed amount of the friction screw of the rubbing support according to the experimental requirements, that is, set the rubbing amount of the rotor system, then run the motor, and adjust the motor speed according to the experimental requirements through the frequency converter to conduct the experiment;

[0027] (4) Compound faults composed of any two or three of misalignment, unbalance and rubbing faults

[0028] According to the different fault components in the actual experimental requirements, set the misalignment amount, unbalance amount and rubbing state amount respectively according to the method steps described in the above (1) - (3), then run the motor, and adjust the motor speed according to the experimental requirements through the frequency converter to conduct the experiment.

[0029] The beneficial effects of the present invention are:

[0030] The present invention is a horizontal multi-span multi-functional fault rotor system comprehensive test bench with a changeable structural form, adjustable size, and stepless adjustment of the radial displacement at any position on the rotating shaft. By changing the size and type of ball bearings, the size of the rotating shaft, the radial offset of the bearings on the rotating shaft, the feed of the friction screws on the rubbing support, and the number of counterweight screws on the disc, the linear and non-linear responses of the rotor system under various faults can be simulated, greatly improving the reliability of relevant research on rotor dynamics and the feasibility of relevant simulation experiments. For adjustable parameters including the tiny displacement in both the axial and radial directions of the bearings, the system operation state information corresponding to the fault category is obtained, which is of great significance for accurately identifying the fault category and location and maintaining the normal operation of the equipment.

[0031] The present invention can simulate various fault forms in complex rotor systems, especially the fault forms related to misalignment. On this basis, the function of the test bench is better improved, and the bearing clamping hole realizes stepless adjustment, thus omitting the machining of bearing seats with different hole diameters, which is also of great significance for the utilization of economic resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the multi-span multi-functional fault rotor system comprehensive test bench of the present invention;

[0033] Figure 2 is a schematic structural diagram of the chuck-type bearing seat assembly in the present invention;

[0034] Figure 3 is a schematic structural diagram of the lead screw drive mechanism in the present invention;

[0035] Figure 4 is a schematic structural diagram of the disc and rubbing support assembly in the present invention;

[0036] Figure 5 is a top view of a part of the laboratory channel steel base using the test bench of the present invention;

[0037] Among them,

[0038] 1 - Base, 2 - Channel steel base one, 3 - Channel steel base two, 4 - Motor base, 5 - Frequency converter, 6 - Motor, 7 - Dovetail groove guide rail, 8 - Lead screw drive mechanism, 9 - Chuck-type bearing assembly, 10 - Rubbing support mechanism, 11 - Coupling one, 12 - Rotating shaft, 13 - Chuck connection frame, 14 - Three-jaw chuck, 15 - Bearing sleeve, 16 - Bearing, 17 - Bearing snap ring, 19 - Servo motor, 20 - Coupling two, 21 - Lead screw, 22 - Chuck connection base, 23 - Measuring knob, 24 - Rectangular positioning groove, 25 - Positioning slider, 26 - Dovetail slider, 27 - Threaded hole one, 28 - Rubbing support, 29 - Friction screw, 30 - Disc, 31 - Disc snap ring, 32 - Threaded hole, 33 - Vibration sensor. Detailed implementation mode

[0039] For better explaining the present invention for easy understanding, the technical solutions and effects of the present invention will be described in detail below in conjunction with the accompanying drawings through specific implementation modes.

[0040] As Figure 1 shown, a multi-span multi-functional fault rotor system comprehensive test bench includes a base 1 for positioning and installing basic components. A channel steel base one 2 for placing a dovetail groove guide rail 7 and a channel steel base two 3 for placing a motor base 4 are fixed on the base 1. In this embodiment, the channel steel base one 2 is made of 20a equal-edge channel steel, and the channel steel base two 3 is made of 32a equal-edge channel steel, both of which are fixed on the base 1 by screws (the screws are not shown). The dovetail groove guide rail 7 is installed on the upper part of the channel steel base one 2. The dovetail groove guide rail 7 is provided with a dovetail groove, and a dovetail slider 26 is slidably connected in the dovetail groove. The upper surface of the dovetail slider 26 is lower than the upper surface of the dovetail groove guide rail 7. A threaded hole one 27 is provided on the dovetail slider 26 for freely moving and positioning on the dovetail groove guide rail 7. A rectangular positioning groove 24 for centering and positioning is provided on the dovetail groove guide rail 7. A plurality of lead screw drive mechanisms 8 for lateral displacement adjustment are slidably connected to the rectangular positioning groove 24 through positioning sliders 25. The plurality of lead screw drive mechanisms 8 are arranged in parallel along the sliding direction of the rectangular positioning groove 24. Bolt holes are provided on the lead screw drive mechanisms 8. The lead screw drive mechanisms 8 and the dovetail slider 26 are fixed by inserting screws into the bolt holes and the threaded hole one 27 (the screws are not shown); A gasket for adjusting the longitudinal displacement is provided between the lead screw drive mechanism 8 and the dovetail groove guide rail 7; A chuck type bearing seat assembly is threadedly connected to each lead screw drive mechanism 8 for freely moving and positioning on the lead screw drive mechanism 8; In this embodiment, three lead screw drive mechanisms 8 are slidably connected to the rectangular positioning groove 24; A rubbing support mechanism 10 for adjusting the rubbing amount is provided between every two adjacent chuck type bearing assemblies 9. The rubbing support mechanism 10 is fixed on the dovetail slider 26 in the dovetail groove track by screws; The installation direction of the rotating shaft 12 is consistent with the sliding direction of the rectangular positioning groove 24. The rotating shaft 12 sequentially passes through the chuck type bearing seat assemblies on the lead screw drive mechanism 8 and the rubbing support mechanism 10 and is connected and fixed through a bearing sleeve 15, a bearing 16 and a bearing snap ring 17. The bearing 16 is a ball bearing. The motor base 4 is installed on the channel steel base two 3. A motor 6 and a frequency converter 5 connected to the motor 6 are fixed on the motor base 4. The rotating shaft 12 is connected to the output end of the motor 6 through a coupling one 11.

[0041] As Figure 2As shown in the figure, the chuck-type bearing seat assembly includes a chuck connecting frame 13. A central hole is provided in the middle of the chuck connecting frame 13. A groove is provided at the bottom of the chuck connecting base 22 corresponding to the center position of its central hole for placing a positioning slider 25 to achieve centering and positioning. A three-jaw chuck 14 is connected to the side of the chuck connecting frame 13. A bearing sleeve 15, a bearing 16, and a bearing snap ring 17 are clamped on the three-jaw chuck 14 from the outside to the inside. A rotating shaft 12 is fixed inside the bearing snap ring 17. In this embodiment, the three-jaw chuck 14 is fixed to the chuck connecting frame 13 by screws (the screws are not shown). The size of the chuck is adjusted through the square hole on the three-jaw chuck 14 to change the diameter of the clamping hole, and then the required bearing 16 for the experiment is selected, the bearing sleeve 15 is installed, and it is placed within the clamping range of the three-jaw chuck 14 until it is clamped. The chuck connecting frame 13 is threadedly connected to the lead screw drive mechanism 8. The lead screw drive is used to achieve the lateral movement of the chuck connecting frame 13 and the three-jaw chuck 14 to drive the rotating shaft 12, so as to adjust the lateral offset of the rotor.

[0042] While protecting the bearing 16, a vibration sensor 33 is installed on the upper part of the bearing sleeve 15 and is electrically connected to the vibration data acquisition device of the rotor system.

[0043] The lead screw drive mechanism 8 includes a servo motor 19, a coupling two 20, a lead screw 21, a chuck connecting base 22, and a measuring knob 23. The lead screw 21 is connected to the output end of the servo motor 19 through the coupling two 20. The measuring knob 23 is connected to the other end of the lead screw 21. The chuck connecting frame 13 is threadedly connected to the lead screw 21. A dovetail-shaped convex block is provided at the bottom of the chuck connecting frame 13 in a direction parallel to the lead screw 21, which is matched with the dovetail-shaped groove on the chuck connecting base 22 to achieve the sliding connection between the chuck connecting frame 13 and the chuck connecting base 22. The sliding direction of the chuck connecting frame 13 relative to the chuck connecting base 22 is parallel to the axial direction of the lead screw 21 and perpendicular to the sliding direction of the dovetail slider 26 at the same time.

[0044] A lock washer is provided at the bottom of the dovetail slider 26 to prevent the dovetail slider 26 from moving along the dovetail groove guide 7 after the chuck-type connection assembly or the rubbing support mechanism 10 is connected to the dovetail slider 26 by screws.

[0045] Determine the quantity and position of the required chuck-type bearing block assemblies according to the experimental requirements, adjust the position of the dovetail slider 26, and connect the chuck connecting frame 13 together with the chuck connecting base 22 to the dovetail slider 26, so as to adjust and determine the position of the bearing 16 on the rotating shaft 12. The axial position selection and fixation of the rotor are realized. The servo motor 19 drives the lead screw 21 to rotate, and through the lead screw transmission, the chuck connecting frame 13 slides in the chute on the chuck connecting base 22, that is, the stepless adjustment of the lateral offset of the rotor is realized; a scale is provided along the circumference on the measuring knob 23, and the size of the offset, that is, the misalignment amount, is visualized through the scale of the measuring knob 23, and at the same time, the effect of reverse self-locking is achieved, providing a stable guarantee for the vibration influence generated during the experiment. The gasket is arranged between the chuck connecting base 22 and the dovetail groove guide 7 and is used to adjust the longitudinal displacement of the chuck connecting frame 13, so as to realize the adjustment of the longitudinal offset of the rotor. The adjustment of the radial offset including the lateral offset and longitudinal offset of the rotor is realized through the lead screw 21 and the gasket.

[0046] As Figure 4 shown, the rubbing support mechanism 10 includes a disc 30, a rubbing support 28, a friction screw 29, and a disc snap ring 31. The rubbing support 28 is erected on the dovetail groove guide 7, and bolt holes are provided on the rubbing support 28 and are fixed in the dovetail slider 26 through screws to realize the fixation of the rubbing support 28; the top of the disc 30 is fixed on the rubbing support 28 through the friction screw 29, and the disc snap ring 31 is placed in the central hole of the disc 30 to fix the rotating shaft 12. A plurality of circles of threaded holes 32 are evenly distributed along the circumference on the disc 30 and are used to connect the counterweight screws. In this embodiment, a circle of threaded holes 32 is provided on the disc 30, and the unbalance amount of the rotor is adjusted by adjusting the position and quantity of the counterweight screws. The feed amount of the rubbing screw is determined according to the experimental requirements, and at the same time, the feed amount is set by the distance that the rubbing screw is screwed into the disc 30 to realize the adjustment of the rubbing amount of the system. During the experiment, the specific position of the rubbing support mechanism 10 is determined according to the experimental requirements.

[0047] In the rotor system composed of the above-mentioned rotating shaft 12, bearing 16, bearing sleeve 15, and bearing snap ring 17, these parameters including the diameter and length of the rotating shaft 12 and the size and type of the bearing 16 can be changed according to specific experimental needs, and this experimental bench can meet the usage requirements.

[0048] Using the above comprehensive experimental bench, various fault experiments can be carried out: (1) Steplessly adjust within the movable range provided by the lead screw 21 to simulate rotor misalignment faults of different degrees; (2) Simulate rubbing faults between moving and stationary parts of different degrees; (3) Simulate rotor mass imbalance faults of different degrees; (4) Simulate composite faults composed of any two or three of rotor misalignment, imbalance, and rubbing faults of different degrees.

[0049] Embodiment 1

[0050] A method for conducting a rotor misalignment fault experiment using the above-mentioned multi-span multi-functional fault rotor system comprehensive test bench specifically includes the following steps:

[0051] In this experiment, by adjusting the lead screw drive mechanism 8, the chuck connection frame 13 is slid on the chuck connection base 22, thereby realizing stepless adjustment of the rotor lateral offset. By setting gaskets between the chuck connection base 22 and the chuck connection frame 13, stepless adjustment of the rotor longitudinal offset is realized, thereby realizing controllable adjustment of the radial displacement of the bearing 16 on the rotating shaft 12 and simulating the fault of misalignment between the position of the rotating shaft 12 and the motor shaft. The specific steps are as follows:

[0052] Step 1: As Figures 3 - 5 shown, release the fixation of the parts on the rotating shaft 12, that is, remove the coupling two 20, bearing snap ring 17 and disc snap ring 31 connected to the motor 6, and remove the rotating shaft 12, bearing 16, bearing snap ring 17 and bearing sleeve 15;

[0053] Step 2: Connect the chuck connection base 22 to the rectangular groove on the dovetail groove guide 7 through the positioning slider 25 to realize the positioning of the alignment state;

[0054] Step 3: Install the bearing sleeve 15, bearing 16 and bearing snap ring 17 in each chuck-type bearing assembly 9 on the rotating shaft 12 in sequence, tighten and fix the disc snap ring 31 and bearing snap ring 17. After adjusting the alignment between the rotating shaft 12 and the motor 6 and then tightening the coupling one 11, slide the position of the dovetail slider 26 according to the experimental requirements to determine the axial position of the chuck-type bearing assembly 9;

[0055] Step 4: Turn on the servo motor 19, adjust the required lateral offset through the lead screw 21 and the measurement knob 23, and then add gaskets with different thicknesses at the connection between the chuck connection frame 13 and the chuck connection base 22 to set the required longitudinal offset. Finally, tighten the chuck connection base 22 and the dovetail slider 26 with screws (the screws are not shown); then run the motor 6 and adjust the motor 6 speed through the frequency converter 5 according to the experimental requirements for the experiment.

[0056] Example 2

[0057] A method for conducting a rotor imbalance fault experiment using the above-mentioned multi-span multi-functional fault rotor system comprehensive test bench specifically includes the following steps:

[0058] When conducting an imbalance experiment using the above-mentioned comprehensive test bench, screws of the same specification are needed to configure the imbalance component. By setting the position and quantity of the counterweight screws on the disc 30 in the rubbing support mechanism 10, the adjustment of the system imbalance amount is realized, so as to meet the experimental requirements. The specific steps are as follows:

[0059] Step 1: As Figures 4 - 5 shown, release the fixation of the parts on the rotating shaft 12, that is, remove the coupling two 20, bearing snap ring 17 and disc snap ring 31 connected to the motor 6, and take off the rotating shaft 12, bearing 16, bearing snap ring 17 and bearing sleeve 15;

[0060] Step 2: Connect the chuck connection base 22 with the rectangular groove on the dovetail groove guide rail 7 through the positioning slider 25 to realize the positioning of the centering state;

[0061] Step 3: Install the bearing sleeve 15, bearing 16 and bearing snap ring 17 in each chuck type bearing assembly 9 and the rubbing support mechanism 10 between the chuck type bearing assemblies 9 on the shaft in sequence, and tighten and fix the disc snap ring 31 and bearing snap ring 17. After adjusting the centering connection between the rotating shaft 12 and the motor 6, tighten the coupling one 11, and slide the position of the dovetail slider 26 according to the experimental requirements to determine the axial position of the chuck type bearing assembly 9;

[0062] Step 4: Determine the number of counterweight screws according to the unbalance amount required for the experiment, install the required counterweight screws at the threaded hole 32 position of the disc 30 in the rubbing support mechanism 10 to realize the adjustment of the rotor unbalance amount, and then run the motor 6, and adjust the motor 6 speed to run the experiment through the frequency converter 5 according to the experimental requirements.

[0063] Example 3

[0064] A method for conducting a rubbing experiment using the above multi-span multi-functional fault rotor system comprehensive test bench specifically includes the following steps:

[0065] When conducting a rubbing experiment using the above comprehensive test bench, by setting the feed amount of the friction screw 29 on the rubbing support 28, different degrees of rubbing faults are simulated to meet the experimental requirements. The specific steps are as follows:

[0066] Step 1: As Figures 4 - 5 shown, release the fixation of the parts on the rotating shaft 12, that is, remove the coupling two 20, bearing snap ring 17 and disc snap ring 31 connected to the motor 6, and take off the rotating shaft 12, bearing 16, bearing snap ring 17 and bearing sleeve 15;

[0067] Step 2: Connect the chuck connection base 22 with the rectangular groove on the dovetail groove guide rail 7 through the positioning slider 25 to realize the positioning of the centering state;

[0068] Step 3: Install the bearing sleeve 15, bearing 16 and bearing snap ring 17 in each chuck type bearing assembly 9 and the rubbing support mechanism 10 between the chuck type bearing assemblies 9 in sequence, and tighten and fix the disc snap ring 31, bearing snap ring 17 and coupling one 11, and slide the position of the dovetail slider 26 according to the experimental requirements to determine the axial position of the chuck type bearing assembly 9;

[0069] Step 4: Adjust the feed of the friction screw 29 of the rub-impact bracket 28 according to the experimental requirements, that is, set the rub-impact amount of the rotor system, and then run the motor 6. Adjust the rotational speed of the motor 6 through the frequency converter 5 according to the experimental requirements to conduct the experiment.

[0070] Embodiment 4

[0071] When using the above comprehensive test bench to conduct simulation experiments on any two or three of the compound faults composed of misalignment, unbalance and rub-impact faults at the same time, according to the different fault components in the actual experimental requirements, set the misalignment amount, unbalance amount and rub-impact state amount respectively according to the method steps of Embodiments 1-3, and then run the motor 6. Adjust the rotational speed of the motor 6 through the frequency converter 5 according to the experimental requirements to conduct the experiment.

[0072] The overall structure of the multi-span multi-functional fault rotor system test bench provided by the present invention is simple, and it is convenient to move, fix, install and debug. The present invention is used to simulate various fault forms in a complex rotor system, realize the stepless adjustment of the clamping hole of the bearing 16 and the lateral stepless adjustment of the misalignment offset, greatly improving the reliability of the research related to rotor dynamics and the feasibility of related simulation experiments.

Claims

1. A multi-span multi-functional comprehensive experimental platform for a faulty rotor system, characterized in that: It includes a base, on which a channel steel base one and a channel steel base two are fixed. A dovetail groove guide rail is installed on the upper part of the channel steel base one. A dovetail groove is provided on the dovetail groove guide rail, and a dovetail slider is slidably connected in the dovetail groove. A rectangular positioning groove for centering and positioning is provided on the dovetail groove guide rail. A plurality of lead screw drive mechanisms for lateral displacement adjustment are slidably connected to the rectangular positioning groove through positioning sliders. The plurality of lead screw drive mechanisms are arranged side by side along the sliding direction of the rectangular positioning groove, and the lead screw drive mechanism is fixed to the dovetail slider. A gasket for adjusting longitudinal displacement is provided between the lead screw drive mechanism and the dovetail groove guide rail. A chuck type bearing seat assembly is threadedly connected to each lead screw drive mechanism. A rubbing support mechanism for adjusting the rubbing amount is provided between every two adjacent chuck type bearing assemblies. The rubbing support mechanism is fixed to the dovetail slider in the dovetail groove track by screws. The rotating shaft sequentially passes through the chuck type bearing seat assemblies on the lead screw drive mechanism and the rubbing support mechanism and is connected and fixed through a bearing sleeve, a bearing and a bearing snap ring. A vibration sensor is installed on the bearing sleeve and is electrically connected to the vibration data acquisition device of the rotor system. The motor base is installed on the channel steel base two, and a motor and a frequency converter connected to the motor are fixed on the motor base. The rotating shaft is connected to the output end of the motor through a coupling one. A lock washer is provided at the bottom of the dovetail slider. The chuck type bearing seat assembly includes a chuck connection frame, a central hole is provided in the middle of the chuck connection frame, and a groove is provided at the bottom of the chuck connection base corresponding to the center position of its central hole. A three-jaw chuck is connected to the side of the chuck connection frame. The bearing sleeve, the bearing and the bearing snap ring are clamped on the three-jaw chuck from the outside to the inside, and the rotating shaft is fixed in the bearing snap ring. The chuck connection frame is threadedly connected to the lead screw drive mechanism. The rubbing support mechanism includes a disc, a rubbing support, a friction screw and a disc snap ring. The rubbing support is erected on the dovetail groove guide rail. A bolt hole is provided on the rubbing support and is fixed to the dovetail slider by screws to realize the fixation of the rubbing support. The top of the disc is fixed to the rubbing support by a friction screw, and the disc snap ring is placed in the central hole of the disc to fix the rotating shaft. A plurality of circumferentially evenly distributed threaded holes are provided on the disc for connecting counterweight screws.

2. The integrated experimental bench for a multi-span multi-functional faulty rotor system according to claim 1, characterized in that: The upper surface of the dovetail slider is lower than the upper surface of the dovetail groove guide rail.

3. The comprehensive experimental platform for a multi-span and multi-functional faulty rotor system according to claim 2, characterized in that: A threaded hole one is provided on the dovetail slider, a bolt hole is provided on the lead screw drive mechanism, and the lead screw drive mechanism and the dovetail slider are fixed by inserting screws into the bolt hole and the threaded hole one.

4. A comprehensive experimental platform for a multi-span and multi-functional faulty rotor system according to claim 1, characterized in that: Three lead screw drive mechanisms are slidably connected to the rectangular positioning groove.

5. The integrated experimental platform for a multi-span multi-functional faulty rotor system according to claim 1, characterized in that: The lead screw drive mechanism includes a servo motor, a coupling two, a lead screw, a chuck connection base and a measuring knob. The lead screw is connected to the output end of the servo motor through the coupling two, and the measuring knob is connected to the other end of the lead screw. The chuck connection frame is threadedly connected to the lead screw. A dovetail convex block is provided at the bottom of the chuck connection frame in the direction parallel to the lead screw, and is matched with the dovetail groove on the chuck connection base to realize the sliding connection between the chuck connection frame and the chuck connection base. The sliding direction of the chuck connection frame relative to the chuck connection base is parallel to the axial direction of the lead screw and perpendicular to the sliding direction of the dovetail slider at the same time.

6. A method for conducting experiments using a multi-span multi-functional fault rotor system comprehensive test bench according to any one of claims 1-5, characterized in that Specifically, it includes the following steps: (1) Rotor misalignment fault experiment Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the coupling II, bearing snap rings and disc snap rings connected to the motor, and take off the rotating shaft, bearings, bearing snap rings and bearing sleeves; Step 2: Connect the chuck connection base to the rectangular groove on the dovetail groove guide through the positioning slider to realize the positioning of the alignment state; Step 3: Install the bearing sleeves, bearings and bearing snap rings in each chuck-type bearing assembly on the rotating shaft in sequence, tighten the fixed disc snap ring and bearing snap ring, adjust the alignment of the rotating shaft and the motor and then tighten coupling I. Slide the position of the dovetail slider according to the experimental requirements to determine the axial position of the chuck-type bearing assembly; Step 4: Turn on the servo motor, adjust the required lateral offset through the lead screw and measurement knob, and then add gaskets of different thicknesses at the connection between the chuck connection frame and the chuck connection base to set the required longitudinal offset for the experiment. Finally, tighten the chuck connection base and the dovetail slider with screws; then run the motor and adjust the motor speed through the frequency converter according to the experimental requirements to conduct the experiment; (2) Rotor unbalance fault experiment Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the coupling II, bearing snap rings and disc snap rings connected to the motor, and take off the rotating shaft, bearings, bearing snap rings and bearing sleeves; Step 2: Connect the chuck connection base to the rectangular groove on the dovetail groove guide through the positioning slider to realize the positioning of the alignment state; Step 3: Install the bearing sleeves, bearings and bearing snap rings in each chuck-type bearing assembly on the shaft in sequence, and install the rubbing support mechanism between the chuck-type bearing assemblies, and tighten the fixed disc snap ring and bearing snap ring. Adjust the alignment of the rotating shaft and the motor and then tighten coupling I. Slide the position of the dovetail slider according to the experimental requirements to determine the axial position of the chuck-type bearing assembly; Step 4: Determine the number of counterweight screws according to the required unbalance amount of the experiment, install the required counterweight screws at the threaded hole positions of the disc in the rubbing support mechanism to adjust the rotor unbalance amount, and then run the motor and adjust the motor speed through the frequency converter according to the experimental requirements to conduct the experiment; (3) Rubbing experiment Step 1: Remove the fixation of the parts on the rotating shaft, that is, remove the coupling II, bearing snap rings and disc snap rings connected to the motor, and take off the rotating shaft, bearings, bearing snap rings and bearing sleeves; Step 2: Connect the chuck connection base to the rectangular groove on the dovetail groove guide through the positioning slider to realize the positioning of the alignment state; Step 3: Install the bearing sleeves, bearings and bearing snap rings in each chuck-type bearing assembly in sequence, and install the rubbing support mechanism between the chuck-type bearing assemblies, and tighten the fixed disc snap ring, bearing snap ring and coupling I. Slide the position of the dovetail slider according to the experimental requirements to determine the axial position of the chuck-type bearing assembly; Step 4: Adjust the feed amount of the friction screw of the rubbing support according to the experimental requirements, that is, set the rubbing amount of the rotor system, and then run the motor and adjust the motor speed through the frequency converter according to the experimental requirements to conduct the experiment; (4) Compound faults composed of any two or three of misalignment, unbalance and rubbing faults According to different fault components in the actual requirements of the experiment, set the misalignment amount, unbalance amount and rub-impact state amount respectively according to the method steps described in the above (1) to (3), and then run the motor. Adjust the motor speed through the frequency converter according to the experimental requirements to conduct the experiment.

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