Life testing machine capable of simultaneously detecting swing and rotation of rod end knuckle bearing

Abstract

The invention relates to a life testing machine capable of simultaneously detecting swing and rotation of a rod end knuckle bearing, which comprises an operation mechanism, a load mechanism, a control mechanism and a bearing mechanism, and is characterized in that the operation mechanism is mounted on a rack table top and comprises a servo motor fixed on a motor seat and connected with a coupler to drive a ball screw to reciprocate; linear guide rails and sliding blocks are arranged on the two sides of the ball screw. The device is easy to use, stable in operation, adjustable in speed and adjustable in load, life tests of two different motions are achieved, the test efficiency is improved, and the test time is greatly shortened.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of joint bearing testing, and in particular to a life testing machine for simultaneously detecting the swing and rotation of rod end joint bearings. Background Art

[0002] With the continued development of the global economy and the growing population, the demand for energy is increasing. Gas turbines, as efficient and clean energy conversion equipment, are playing an increasingly important role in power generation, industrial drives, aerospace, and other fields. Rod end bearings, as one of the key components of gas turbines, are connected to the adjustable guide vane rocker arms and drive rings on both sides of the IGV / VGVs adjustable guide vane drive system. The universality of their ball joints enables the drive rings to rotate circumferentially and pull the blades in rotation. The IGV / VGVs guide vanes need to be frequently moved during unit startup, shutdown, load regulation, surge control, and other processes. At the same time, they are affected by aerodynamics and the vibrations caused by the impact of airflow while the blades maintain their angle, all of which place extremely high demands on the service life of the rod end bearings.

[0003] At the same time, rod end joint bearings are widely used and are widely used in automation equipment, automobiles, aerospace, and gas turbines. Under different operating conditions, the life conditions that rod end joint bearings used in aviation, automobiles, and gas turbines must meet are relatively harsh. Before being put into use for the first time, strict life tests are required to ensure the function of the product and verify its design life.

[0004] Currently, most of the test equipment can only perform single swing or single rotation life test, which has the disadvantages of low efficiency and long test time. Therefore, it is necessary to make a life tester that can simultaneously detect the swing and rotation of the rod end joint bearing.

[0005] The present invention relates to the field of spherical joint bearing testing technology. Currently, there are spherical joint bearing testing machines on the market that are only for single rotation, such as CN212321070U, or for single swing, such as CN210442102U. Therefore, in accordance with the test requirements, a life testing machine is invented that can simultaneously detect the swing and rotation of rod end spherical joint bearings, and test two rotating parts at the same time. The test machine can be a combination of two ordinary rod end spherical joint bearings, or a finished rod end spherical joint bearing with two spherical joint bearings assembled in one. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing.

[0007] A dynamic load life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing is characterized in that an operating mechanism, a load mechanism, a control mechanism and a bearing mechanism are provided above the frame, wherein:

[0008] The operating mechanism directly above the frame includes a screw base, with two screw support blocks located at the front and rear of the base. These support blocks are equipped with ball screws, which are connected to the ball screws by ball nuts and nut blocks. A linear guide rail is located on each side of the ball screw, which works in conjunction with the slider. A work surface is fixed above the slider, and the bearing connecting rod mounting block is fixed to the surface.

[0009] On the front left side of the carrying mechanism is the load mechanism of the present invention. The load mechanism is controlled by hydraulic pressure, can provide load stably and reliably, and is loaded by a hydraulic cylinder provided under the frame. Two friction plates are provided above the frame table. The lower friction plate is connected to the hydraulic cylinder. A friction plate cover plate matching the upper friction plate is fixed to the friction plate. A D-shaped groove is provided in the center of the friction plate cover plate, and a fixed block is embedded in it. The fixed block is fixed to the hydraulic cylinder lever head by a rotating block above the fixed block, and the bearing connecting rod is connected to the rotating block.

[0010] The control mechanism is driven by a servo motor, which is fixed to a motor base. A coupling connects the output shaft to the lead screw. A numerical control system and servo motor driver assist in controlling the lead screw's travel distance and speed. The control system drives the work surface above the ball screw. A test rod end bearing is mounted on the bearing connecting rod on the table. The rotating block on the load mechanism is also equipped with a bearing connecting rod, which also mounts a test rod end bearing. Finally, the two rod ends are secured together by a bearing connecting nut.

[0011] After the above-mentioned rod end joint bearings are connected, they are driven to reciprocate by the ball screw, causing the rod end joint bearings connected to the operating part to perform radial swinging motion, and the rod end joint bearings on the load mechanism to perform axial rotational motion. The hydraulic cylinder at the load position applies pressure, and the friction between the friction plates enables the rod end joint bearings to achieve the load conditions that need to be borne under actual working conditions during the test.

[0012] A counting induction switch is provided on the left side of the operating part workbench, and a counter is also provided on the frame table opposite the induction switch. The ball screw moves back and forth, and the counter records the corresponding number of times. After reaching the rated number of times, the rod end joint bearing is disassembled and the wear of its inner and outer rings is measured to confirm its service life.

[0013] Compared with the existing technology, the advantages of this invention are:

[0014] The present invention is simple to use, has stable operation, is speed-adjustable, and has adjustable load, thereby realizing life tests of two different motions, speeding up the test efficiency, and greatly shortening the test time.

[0015] The present invention relates to a life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing. The present invention comprises an operating mechanism, a load mechanism, a control mechanism, and a bearing mechanism. The operating mechanism comprises a servo motor, a motor seat, a ball screw, a ball nut, a nut seat, a screw support seat, a guide rail, a slider, a coupling, and the like. The load mechanism comprises a hydraulic cylinder, a friction plate, a friction plate cover, a fixed block, a rotating block, and the like. The control mechanism comprises a numerical control system, a servo motor driver, a counter, a counting induction switch, and the like. The bearing mechanism comprises a bearing connecting rod, a bearing connecting nut, a work surface, a frame surface, a bearing connecting rod mounting seat, and a screw base, and the like.

[0016] Compared with existing testing machines such as CN212321070U and CN210442102U, which can only perform single rotation or single swing and cannot freely increase the load, the present invention can meet the requirements of swing and rotation life tests of rod end joint bearings at the same time. It is controlled by a numerical control system, which is simpler to operate. The transmission under the ball screw and linear guide rail will make the operation more stable. The motor drive can be adjusted in speed. The load mechanism can increase the load through the hydraulic cylinder to better fit the actual use of the product and meet the life test of the product under normal use conditions. The calculation and analysis of the actual wear condition of the bearing through the counter can make the results more accurate. The test performed simultaneously in swing and rotation can better improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the appearance of a specific embodiment of the present invention

[0018] Figure 2 Schematic diagram of the operating mechanism of the present invention

[0019] Figure 3 Schematic diagram of the load mechanism of the present invention

[0020] Figure 4 Schematic diagram of the motion of the present invention

[0021] The accompanying drawings are:

[0022] 10-carrying mechanism, 11-bearing connecting rod, 12-bearing connecting nut, 13-working table, 14-frame table, 15-bearing connecting rod mounting seat, 16-screw base

[0023] 20-operating mechanism, 21-linear guide, 22-slider, 23-screw support seat, 24-motor seat, 25-motor, 26-ball screw, 27-ball nut, 28-nut seat, 29-coupling

[0024] 30-Load mechanism, 31-Hydraulic cylinder, 32-Fixed block, 33-Friction plate cover, 34-Friction plate, 35-Rotating block

[0025] 40-control mechanism, 41-servo motor driver, 42-CNC system, 43-counter, 44-counting induction switch, 45-temperature sensor DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0027] according to Figure 1 The present invention is shown as being divided into 10 - a bearing mechanism, 20 - a running mechanism, and 30 - a loading mechanism.

[0028] according to Figure 2 As shown, the operating mechanism 20 is located above the frame table 14 and is fixed to the screw base 16 by bolts. There are positioning grooves for installing linear guides 21 on the left and right sides of the screw base 16. The linear guides 21 are fixed to the screw base 16 by bolts. Each of the left and right linear guides 21 is installed with a matching slider 22. The central part of the screw base 16 is installed on the screw support seat 23 in front and behind the screw base 16 by a ball screw 26 and a matching ball nut 27. The ball nut 27 is equipped with a nut seat 28 to fix it. The installation plane height of the nut seat 28 is flush with the working surface height of the slider 22. The work table 13 is then fixed to the slider 22 and the nut seat 28 by bolts. A bearing connecting rod mounting seat 15 is provided above the work table 13. The bearing connecting rod mounting seat 15 has a mounting threaded hole, which mates with the mounting thread of the bearing connecting rod 11. The bearing connecting rod 11 is used to fix the rod end joint bearing for testing.

[0029] The control mechanism 40 is located behind the frame table 14. The servo motor 25 and its matching motor base 24 are fixed on the frame table 14. The output shaft of the servo motor 25 cooperates with the coupling 29. The output shaft is locked using the bolts on the coupling 29, and a key is used to achieve power transmission. The other end of the coupling 29 is locked with the input shaft end of the ball screw 26, and a key is also used to achieve power transmission.

[0030] The servo motor 25 is controlled by a control structure, including a numerical control system 42 and a servo motor driver 41, which set parameters to achieve reciprocating motion of the work surface 13. A counting sensor switch 44 is located on the left side of the work surface 13, and a counter 43 is also located on the frame surface 14 opposite the counting sensor switch 44. The counter 43 records the reciprocating motion of the ball screw 26. A temperature sensor 45 is installed at the rod end joint bearing, with a safety temperature set at 150°C. When the sensor temperature exceeds 150°C, the equipment automatically alarms and stops the test. Different temperature control protections can be activated according to different working conditions and specific needs, ensuring that the results are more in line with actual usage.

[0031] according to Figure 3The load mechanism 30 is located on the upper left side of the frame table 14 and is hydraulically driven. It applies the load during operation via the friction plate 34. A hydraulic cylinder 31 is mounted below the frame table 14. Its piston rod must penetrate components mounted above, including the friction plate 34 above the frame table 14. The lower friction plate is bolted to the frame table 14, while the upper friction plate is fixed to it by a friction plate cover 33. The friction plate cover 33 has a D-shaped groove in the center, into which a fixed block 32 fits. The upper friction plate 34 is rotated by a rotating block 35 mounted above. Simultaneously, the hydraulic cylinder 31 applies pressure to the piston rod above the rotating block 35. After the hydraulic cylinder 31 is pressurized, a tension sensor is connected to the work table 13. The tension sensor is driven by the motor 25, pushing and pulling the sensor back and forth to measure the required load tension. After the hydraulic cylinder 31 maintains pressure, the test rod end joint bearing is installed. Depending on the load, the hydraulic cylinder 31 can be set to different pressures to increase the force between the friction plates 34, thereby adjusting the load.

[0032] according to Figure 4 As shown, the rod end joint bearing driven by the ball screw 26 serves as the thrust part, and its bearing connecting rod 11 is placed horizontally. The ball screw 26 is driven by the motor to make reciprocating motion, and the inner and outer rings of the rod end joint bearing placed on the work surface 13 make left and right swing motions as shown in FIG. Figure 4 As shown in (1), the rod end joint bearing at the load mechanism 30 has a vertical bearing connecting rod 11. Secondly, since the rotating block 35 uses the piston rod of the hydraulic cylinder 31 as the rotation center, the inner and outer rings of the rod end joint bearing at the load mechanism 30 rotate horizontally as shown in Figure 4 (2) shown.

[0033] According to the above description, the present invention can confirm the service life of the spherical plain bearing by observing the wear of the inner and outer rings of the product after the number of times the equipment has been run has reached the rated life.

[0034] Although the invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing, characterized by: It includes an operating mechanism, a load mechanism, a control mechanism and a bearing mechanism, wherein the operating mechanism is installed on the frame table. The operating mechanism includes a servo motor fixed to the motor base and connected through a coupling to drive the ball screw to perform reciprocating motion. Linear guide rails and sliders are provided on both sides of the ball screw.

2. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 1, characterized in that: The upper portion of the operating mechanism is connected to a working table in the bearing mechanism. A bearing connecting rod mounting seat is provided above the table. The bearing connecting rod mounting seat is provided with a bearing connecting rod.

3. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 2, characterized in that: The load mechanism is structured such that a hydraulic cylinder is installed below the frame table, the frame table is connected to the hydraulic cylinder head via the inner hole of the friction plate, a friction plate cover is provided above the friction plate, the cover is connected to the fixed block, a rotating block is provided above the fixed block, the rotating block is connected to the bearing connecting rod, and a joint bearing is fixed above the bearing connecting rod.

4. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 3, characterized in that: The rod end joint bearing is connected to another rod end joint bearing and the bearing connecting rod described in claim 2 through a bearing connecting nut to form a connecting rod.

5. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 4, characterized in that: The control mechanism is controlled by the numerical control system and the servo motor driver to control the travel distance of the lead screw, and then the counting induction switch is installed on the left side of the work table. A counter is provided on the frame table, and the counter detection head is facing the counting induction switch.

6. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 5, characterized in that: The operating mechanism is driven by a motor to drive the ball screw to perform reciprocating motion, the joint bearing is driven by the screw to perform radial swinging motion, and the rod end joint bearing is driven by the bearing connecting nut to perform axial rotational motion.

7. A life testing machine for simultaneously detecting the swing and rotation of a rod end joint bearing according to claim 6, characterized in that: The number of swings or rotations is used as a life standard. After the counter reaches a final target number, the rod end joint bearing is disassembled to detect actual wear and tear to confirm its service life.

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