A life test axial loading device

Abstract

The utility model discloses a life test axial loading device, including frame, the inside fixed connection of frame has the step motor, the top fixed connection of step motor output shaft has workstation, the inside fixed connection of workstation has two servo motors, the top of two servo motor output shafts all is fixedly connected with conical main shaft, the top of two conical main shafts all is fixedly covered and is equipped with angular contact ball bearing body, the top fixed connection of frame has the pneumatic cylinder, the bottom fixed connection of pneumatic cylinder output end has the upper push board, the bottom fixed connection of upper push board has four struts. The utility model discloses through step motor drive workstation and carries out one hundred and eighty degrees reciprocating rotation, realizes another station synchronous to carry out the preparation of dismounting when a station test, can switch fast after testing, eliminates the waiting time of traditional single station equipment, realizes the uninterrupted continuous test, improves the equipment utilization and test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of angular contact ball bearing technology, and in particular to an axial loading device for life testing. Background Technology

[0002] Angular contact ball bearings are rolling bearings that can simultaneously withstand radial loads and unidirectional axial loads. Their rolling elements and inner and outer ring raceways form a certain contact angle at the contact point, thereby achieving high rigidity and high speed performance through axial component force during rotation. They are widely used in machine tool spindles, motors, gearboxes, and other applications. Since their performance is highly dependent on the axial preload and the actual axial load condition during operation, it is necessary to test the axial load capacity of angular contact ball bearings.

[0003] In existing axial loading life tests of angular contact ball bearings, a single-station structure is commonly used. During the test, the machine needs to be stopped to disassemble, replace, and readjust the bearing, resulting in low test efficiency and difficulty in meeting the needs of batch verification. The loading method mostly relies on rigid pressure heads or threaded locking mechanisms, which cannot be quickly adapted to bearings with different inner ring diameters. Replacing the loading head requires tools for disassembly and assembly, which is time-consuming and easily damages the bearing end face. Therefore, we propose an axial loading device for life testing to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an axial loading device for life testing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An axial loading device for life testing includes a frame, a stepper motor fixedly connected inside the frame, a worktable fixedly connected to the top of the output shaft of the stepper motor, two servo motors fixedly connected inside the worktable, a tapered spindle fixedly connected to the top of the output shaft of each of the two servo motors, an angular contact ball bearing body fixedly sleeved on the top of each of the two tapered spindles, a cylinder fixedly connected to the top of the frame, an upper push plate fixedly connected to the bottom of the output end of the cylinder, four pillars fixedly connected to the bottom of the upper push plate, a common lower push plate fixedly connected to the bottom of the four pillars, and an axial loading assembly provided on the outer wall of the lower push plate.

[0007] Preferably, the axial loading assembly includes a T-shaped column, an oil-free bushing is fixedly embedded in the outer wall of the push plate, the inner wall of the oil-free bushing is rotatably connected to the outer wall of the T-shaped column, a T-shaped inner tube is fixedly connected to the bottom of the T-shaped column, a magnetic ring is fixedly embedded in the outer wall of the T-shaped inner tube, and an axial pressing tube is magnetically connected to the bottom of the magnetic ring. The axial loading assembly can perform axial loading on inner rings of different diameters.

[0008] Preferably, the top of the frame has a circular hole, and the inner wall of the circular hole is rotatably connected to the outer wall of the stepper motor output shaft.

[0009] Preferably, the top of the worktable has two through holes, and the inner walls of the two through holes are rotatably connected to the outer walls of the output shafts of the two servo motors, respectively.

[0010] Preferably, the outer wall of the frame is provided with a sliding hole, and the inner wall of the sliding hole is slidably connected to the outer wall of the cylinder output end.

[0011] Preferably, the inner wall of the axially pressing tube is in contact with the outer wall of the T-shaped inner tube, and the T-shaped inner tube assists the rotation and support of the axially pressing tube.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This solution uses a stepper motor to drive the worktable to rotate 180 degrees back and forth, so that while one workstation is being tested, another workstation can be prepared for assembly and disassembly simultaneously. After the test is completed, the workstation can be quickly switched, eliminating the waiting time of traditional single-workstation equipment, realizing uninterrupted continuous testing, and improving equipment utilization and testing efficiency.

[0014] The axial pressing tube is magnetically connected to the T-shaped inner tube via a magnetic ring, allowing for quick replacement of the press head for bearings of different inner diameters without the need for tools. The constant pressure provided by the cylinder ensures that the axial load is applied evenly to the bearing end face, avoiding damage that may be caused by rigid pressing. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of an axial loading device for life testing proposed in this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of an axial loading device for life testing proposed in this utility model;

[0018] Figure 3 This utility model proposes an axial loading device for life testing. Figure 2 A magnified structural diagram of part A in the diagram;

[0019] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of an axial loading device for life testing proposed in this utility model.

[0020] In the diagram: 1. Frame; 2. Stepper motor; 3. Worktable; 4. Servo motor; 5. Tapered spindle; 6. Angular contact ball bearing body; 7. Cylinder; 8. Upper push plate; 9. Support column; 10. Lower push plate; 11. T-shaped column; 12. Oil-free bushing; 13. T-shaped inner tube; 14. Magnetic ring; 15. Axial downward pressure tube. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Depend on Figures 1-4 As shown, an axial loading device for life testing is disclosed, comprising a frame 1, a stepper motor 2 fixedly connected inside the frame 1, multiple heat dissipation holes and a maintenance door on the outer wall of the frame 1, a circular hole on the top of the frame 1, the inner wall of the circular hole being rotatably connected to the outer wall of the output shaft of the stepper motor 2, a worktable 3 fixedly connected to the top of the output shaft of the stepper motor 2, the output shaft of the stepper motor 2 driving the worktable 3 to rotate 180° to achieve alternating switching between two workstations, and existing encoders are installed on the outer walls of the output shafts of both the stepper motor 2 and the servo motor 4 for detecting the angular velocity and angular position of the output shaft.

[0023] The worktable 3 has two servo motors 4 fixedly connected inside. The top of the worktable 3 has two through holes. The inner walls of the two through holes are rotatably connected to the outer walls of the output shafts of the two servo motors 4 respectively. The tops of the output shafts of the two servo motors 4 are fixedly connected to tapered spindles 5 by existing countersunk bolts. The tops of the two tapered spindles 5 are fixedly fitted with angular contact ball bearing bodies 6. The tapered structure of each tapered spindle 5 can realize the self-centering positioning of the inner ring of the bearing, ensuring the coaxiality of the angular contact ball bearing body 6 and the spindle.

[0024] A cylinder 7 is fixedly connected to the top of the frame 1. A sliding hole is opened on the outer wall of the frame 1. The inner wall of the sliding hole is slidably connected to the outer wall of the output end of the cylinder 7. An upper push plate 8 is fixedly connected to the bottom of the output end of the cylinder 7. An existing pressure sensor (LFSQ-60T) can be added at the connection between the output end of the cylinder 7 and the upper push plate 8. The detection end of the pressure sensor (LFSQ-60T) is fixedly connected to the top of the upper push plate 8, and the top of the pressure sensor (LFSQ-60T) is fixedly connected to the bottom of the output end of the cylinder 7. The pressure sensor detects the magnitude of the downward pressure. Four support columns 9 are fixedly connected to the bottom of the upper push plate 8. The bottom of the four support columns 9 is fixedly connected to the same lower push plate 10. The flat surface of the upper push plate 8 ensures that the four support columns 9 are evenly stressed, and smoothly transmits the axial force of the cylinder 7 to the lower push plate 10, avoiding uneven load during loading and ensuring that the bearing is evenly stressed.

[0025] The outer wall of the push plate 10 is provided with an axial loading assembly, which includes a T-shaped column 11. An oil-free bushing 12 is fixedly embedded in the outer wall of the push plate 10. The inner wall of the oil-free bushing 12 is rotatably connected to the outer wall of the T-shaped column 11. The top limit function of the T-shaped structure of the T-shaped column 11 prevents the T-shaped inner tube 13 from falling off, while ensuring rotation and ensuring continuous and reliable loading process. The cooperation between the T-shaped column 11 and the oil-free bushing 12 makes the rotation smooth and reduces the influence of frictional resistance on the loading force.

[0026] The bottom of the T-shaped column 11 is fixedly connected to a T-shaped inner tube 13. A magnetic ring 14 is fixedly embedded in the outer wall of the T-shaped inner tube 13. The bottom of the magnetic ring 14 is magnetically connected to an axial pressing tube 15. The axial pressing tube 15 is fixed by magnetic adsorption, which realizes the quick installation and replacement of the fixed axial pressing tube 15. The fixed axial pressing tube 15 does not directly contact the magnetic ring 14, and there is a certain gap to avoid damage to the magnetic ring 14. The inner wall of the axial pressing tube 15 is in contact with the outer wall of the T-shaped inner tube 13. The T-shaped inner tube 13 assists the rotation and supports the axial pressing tube 15.

[0027] Working principle: When in use, the angular contact ball bearing body 6 is first mounted on the tapered spindle 5 at the top of the output shaft of one of the servo motors 4, and the tapered spindle 5 is used to achieve self-centering and reliable fixation of the inner ring;

[0028] Based on the inner ring diameter of the bearing to be tested, an axially pressing tube 15 with a matching inner diameter is selected. It can be quickly installed and fixed in position by magnetic adsorption between the magnetic ring 14 and the outer wall of the T-shaped inner tube 13. No threads or clips are required, making it easy to replace.

[0029] The cylinder 7 at the top of the starter frame 1 moves its output end down along the sliding hole on the outer wall of the starter frame 1, driving the upper push plate 8 and the lower push plate 10 connected by four pillars 9 to descend synchronously; the lower push plate 10 pushes the bottom T-shaped inner tube 13 closer to the angular contact ball bearing body 6 below.

[0030] The axial pressing tube 15 is pressed down together with the T-shaped inner tube 13 under the action of magnetic force. Its inner wall is attached to the outer wall of the T-shaped inner tube 13 and the axial load is applied to the inner ring end face of the angular contact ball bearing body 6. The servo motor 4 drives the inner ring of the angular contact ball bearing body 6 to rotate and start the life test. At the same time, another station is in standby state and can be assembled, disassembled and pre-adjusted.

[0031] After the current station completes the test, cylinder 7 retracts to unload, stepper motor 2 drives the worktable 3 to rotate 180° to reset, aligns the angular contact ball bearing body 6 of the other station with the loading center, and cylinder 7 presses down again to apply load, realizing continuous testing in both stations.

[0032] It should be noted that, in actual use, an existing PLC controller can be added. The PLC controller is electrically connected to the stepper motor 2, servo motor 4, cylinder 7, pressure sensor, and encoder to facilitate overall control.

[0033] All standard parts used in this utility model can be purchased from the market. Irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. Furthermore, the structure and principle of the components known to those skilled in the art can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0034] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A life test axial loading device, comprising a frame (1), characterized in that, A stepper motor (2) is fixedly connected inside the frame (1). A worktable (3) is fixedly connected to the top of the output shaft of the stepper motor (2). Two servo motors (4) are fixedly connected inside the worktable (3). A tapered spindle (5) is fixedly connected to the top of the output shaft of each of the two servo motors (4). An angular contact ball bearing body (6) is fixedly fitted on the top of each of the two tapered spindles (5). A cylinder (7) is fixedly connected to the top of the frame (1). An upper push plate (8) is fixedly connected to the bottom of the output end of the cylinder (7). Four pillars (9) are fixedly connected to the bottom of the upper push plate (8). The same lower push plate (10) is fixedly connected to the bottom of the four pillars (9). An axial loading component is provided on the outer wall of the lower push plate (10).

2. The axial loading device for life testing according to claim 1, characterized in that, The axial loading assembly includes a T-shaped column (11), an oil-free bushing (12) is fixedly embedded in the outer wall of the push plate (10), the inner wall of the oil-free bushing (12) is rotatably connected to the outer wall of the T-shaped column (11), a T-shaped inner tube (13) is fixedly connected to the bottom of the T-shaped column (11), a magnetic ring (14) is fixedly embedded in the outer wall of the T-shaped inner tube (13), and an axial pressing tube (15) is magnetically connected to the bottom of the magnetic ring (14).

3. The axial loading device for life testing according to claim 1, characterized in that, The top of the frame (1) has a circular hole, and the inner wall of the circular hole is rotatably connected to the outer wall of the output shaft of the stepper motor (2).

4. The axial loading device for life testing according to claim 1, characterized in that, The top of the workbench (3) has two through holes, and the inner walls of the two through holes are rotatably connected to the outer walls of the output shafts of the two servo motors (4).

5. The axial loading device for life testing according to claim 1, characterized in that, The outer wall of the frame (1) is provided with a sliding hole, and the inner wall of the sliding hole is slidably connected to the outer wall of the output end of the cylinder (7).

6. The axial loading device for life testing according to claim 2, characterized in that, The inner wall of the axially downward pressure tube (15) is in contact with the outer wall of the T-shaped inner tube (13).

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