High-temperature repeated rotation wear testing machine for rocker arm shaft and bushing

Abstract

The utility model provides a rockshaft and bushing high-temperature repeated rotation wear testing machine, which comprises a rack, a test assembly is arranged on the rack, the test assembly comprises rockshaft clamping devices for clamping rockshafts, a resistance type square high-temperature furnace heating device is arranged between the rockshaft clamping devices, and the resistance type square high-temperature furnace heating device is connected with the rockshaft clamping devices. The rocker arm shaft right clamp is provided with a flange plate cooling water circulation system and is matched with a coupler to be connected with a torque sensor, the torque sensor and a support are connected and installed on a middle-layer plate, friction torque between a rocker arm shaft and a lining is recorded in real time, and a power motor is arranged on a bottom plate. The power motor is connected with the variable-eccentric-distance cam device through the coupler, the variable-eccentric-distance cam device drives the loading assembly to complete up-and-down reciprocating motion and drives the rocker arm shaft to achieve reciprocating motion within a fixed angle, and the force application device is loaded on the lining and connected with the rack to adjust spring force so as to achieve preset torque.

Description

Technical Field

[0001] This utility model proposes a high-temperature repeated rotation wear test machine for rocker arm shaft and bushing, specifically relating to the field of mechanical design. Background Technology

[0002] A turbine is a device that converts the energy of a fluid (such as gas, steam, or liquid) into mechanical energy, and is widely used in energy, power, aviation, and shipbuilding industries. Inside a turbine, the rocker arm shaft supports the rocker arm, ensuring its stable rotation and transmitting motion and force to control the turbine's operation. Its installation position ensures the rocker arm swings along a predetermined trajectory. The bushing, mounted on the rocker arm shaft, reduces friction and wear, improves motion accuracy, absorbs vibration and shock, and facilitates installation and maintenance. It is easy to replace when worn, reducing maintenance costs. When the rocker arm shaft and bushing operate within the turbine, the rocker arm shaft rotates due to the internal torque of the turbine. The bushing, fixed in the bearing housing by interference fit or press-fit, provides radial support to the rocker arm shaft, ensuring its stability during high-speed rotation or repetitive motion. Therefore, a certain amount of wear occurs between the rocker arm shaft and the bushing during rotation. The development of a rocker arm shaft and bushing wear testing device stems from a profound understanding of the complexity and harshness of the working conditions of the rocker arm shaft and bushing within a turbine. As a precise and critical friction pair inside the turbine, its performance directly affects the overall operating efficiency and reliability of the turbine. During turbine operation, the rocker arm shaft and bushing are subjected to alternating loads and friction over long periods. These complex stress conditions make the working conditions of the rocker arm shaft and bushing extremely harsh, easily leading to abnormal wear due to lubrication failure or material fatigue. This, in turn, reduces equipment efficiency and lifespan (e.g., diesel engine bushing wear causing interruption of whole-machine testing). This places extremely high demands on the materials, structure, and manufacturing processes of the rocker arm shaft and bushing, necessitating optimization of lubrication design and material selection through wear testing. However, despite these stringent working conditions, existing testing technologies for testing the wear performance of the rocker arm shaft and bushing have significant shortcomings. Traditional rocker arm shaft and bushing wear testing machines suffer from inconvenient grinding block replacement, resulting in low testing efficiency. This limitation prevents current technology from comprehensively and accurately assessing the wear life and reliability of the rocker arm shaft and bushing. Utility Model Content

[0003] To overcome this technical challenge, this invention presents a high-temperature repeated rotation wear testing machine for rocker arm shafts and bushings. This machine can more accurately simulate the stress conditions of rocker arm shafts and bushings during actual operation. By simulating the stress conditions of rocker arm shafts and bushings in a real working environment, the machine can repeatedly test the wear performance of rocker arm shafts and bushings, thereby more accurately evaluating their wear life and reliability.

[0004] The purpose of this invention is to provide a high-temperature repeated rotation wear test machine for rocker arm shaft and bushing, which can simulate the wear of rocker arm shaft and bushing during actual operation of a turbine.

[0005] A high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing includes a frame, on which a testing assembly is provided. The testing assembly includes a rocker arm shaft clamping device for clamping the rocker arm shaft, and a resistance-type square high-temperature furnace heating device is arranged between the rocker arm shaft clamping devices.

[0006] Furthermore, the rocker arm shaft clamping device includes a left rocker arm shaft clamp that is connected to the frame with a bearing and a right rocker arm shaft clamp that is connected to the torque sensor with a coupling. The right rocker arm shaft clamp is formed by connecting a flange cooling water circulation system and a special clamp. The bearing axis connected to the left rocker arm shaft clamp is coaxial with the torque sensor.

[0007] Furthermore, the frame is provided with a base plate, and a middle plate and a top plate are installed on the base plate in sequence via large and small columns. The rocker arm shaft clamping device, the resistance-type square high-temperature furnace heating device and the torque sensor are installed on the middle plate, and the bottom plate is provided with horizontally adjustable support casters.

[0008] Furthermore, the middle layer plate is provided with positioning holes that connect to the top plate. The positioning holes are connected to the middle layer plate and the top plate by small columns and bolts. Both the middle layer plate and the top plate are provided with force application devices.

[0009] Furthermore, the middle layer plate is connected to the base plate via large columns and bolts. A power motor is installed on the base plate. The power motor is connected to a variable eccentricity cam device via a coupling, and drives the loading component to complete the up-and-down repetitive movement through the variable eccentricity cam device.

[0010] Furthermore, the loading assembly includes a Scottish yoke and circular flange linear bearings respectively mounted on the bottom plate, the middle plate, and the top plate, wherein the Scottish yoke is connected to a torque sensor via a coupling.

[0011] Furthermore, the force-applying device includes a spring connector, a tension / compression spring, a bushing connector, a pressure sensor, a locking nut, and a straight rod with partial threads. The tension / compression spring is fixedly mounted on the frame by bolts through the spring connector, and the force-applying device controls the magnitude of the spring force through the tail nut.

[0012] Furthermore, the force-applying device is connected to the bushing via a bushing connector and transmits the required torque; the cam device includes a cam support and a cam, the left side of the cam is connected to the motor rotating shaft via a coupling, and the right side is connected to the cam support.

[0013] Furthermore, the cam device includes a cam support and a cam. The left side of the cam is connected to the motor rotating shaft via a coupling, and the right side is connected to the cam support. The cam device can change the eccentricity by replacing the cam, and by changing the eccentricity, it drives the Scottish yoke to move up and down linearly during movement, realizing the repeated rotation of the rocker arm shaft within a certain angle. To more intuitively demonstrate the magnitude and distribution of stress generated by the bushing under the applied force during the operation of the testing machine, numerical simulation software was used to perform corresponding stress analysis on the stress state of the bushing. Through finite element numerical simulation technology, the stress field distribution of the bushing under different load conditions can be calculated and visualized in combination with structural characteristics.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This utility model is reasonably designed and can realize wear tests on rocker arm shafts and bushings in high-temperature environments, simulating the state of rocker arm shafts and bushings in actual operation, which is more in line with the actual working conditions of turbines. It is helpful for the study of wear life of rocker arm shafts and bushings. Furthermore, the cam uses a simple structure to achieve precise control of eccentricity. During operation, the frictional torque of rocker arm shafts and bushings is recorded in real time, which is highly reliable, accurate in loading and low in cost. Attached Figure Description

[0016] Figure 1 This is an overall structural view of the present invention;

[0017] Figure 2 This is a schematic diagram of the working process of this utility model;

[0018] Figure 3 This is a front view of the present invention;

[0019] Figure 4 This is a cross-sectional view of the force-applying device of this utility model;

[0020] Figure 5 This is an axial view of the clamping device of this utility model;

[0021] Figure 6 This is a schematic diagram of the Scottish yoke of this utility model;

[0022] Figure 7 This is a schematic diagram of the sample to be tested according to this utility model;

[0023] Figure 8 This is a schematic diagram of stress simulation in a half-section view of this utility model.

[0024] In the diagram: 1-Horizontal adjustable support casters, 2-Integral frame, 201-Base plate, 202-Main column, 203-Middle shelf, 204-Small column, 205-Top plate

[0025] 3-Square resistance high-temperature furnace, 301-Upper and lower plate cooling device

[0026] 4-Force application device, 401-Pressure sensor, 402-Spring connector, 403-Straight rod connector, 404-Bushing connector, 405-Threaded straight rod, 406-Tension / compression spring, 407 Locking nut

[0027] 5-Rocker arm shaft-Bushing clamping device, 501-Rocker arm shaft left clamp, 502-Rocker arm shaft, 503-Bushing, 504-Flange cooling water circulation system, 505-Rocker arm shaft right clamp

[0028] 6-Small coupling, 7-Torque sensor, 8-Support, 9-Round flange linear bearing, 10-Scottish yoke, 11-Cam assembly

[0029] 12-Power assembly, 1201-Power motor, 1202-Motor support, 1203-Large coupling. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] In one embodiment of this utility model, such as Figures 1 to 7 As shown, a high-temperature repeated rotation wear test machine for rocker arm shaft and bushing includes a frame 2, on which a test assembly is provided. The test assembly includes a rocker arm shaft clamping device 5 for clamping the rocker arm shaft, and a resistance-type square high-temperature furnace heating device 3 is arranged between the rocker arm shaft clamping devices.

[0034] In one embodiment of this utility model, the frame is provided with a base plate 201, and a middle plate 203 and a top plate 205 are sequentially installed above the base plate 201 via a large column 202 and a small column 204. The rocker arm shaft clamping device 5, the resistance square high-temperature furnace heating device 3, and the torque sensor 7 are installed on the middle plate 203. A horizontally adjustable support caster 1 is provided on the lower side of the base plate 201.

[0035] In one embodiment of this utility model, the rocker arm shaft clamping device includes a left rocker arm shaft clamp 501 connected to the frame with a bearing and a right rocker arm shaft clamp 505 connected to the torque sensor 7 with a small coupling 6. The right rocker arm shaft clamp 505 is formed by connecting a flange cooling water circulation system 504 and a special clamp. The bearing axis connected to the left rocker arm shaft clamp 501 is coaxial with the torque sensor 7.

[0036] In one embodiment of this utility model, the middle layer plate 203 is provided with a positioning hole that connects to the top plate 205. The positioning hole is connected to the middle layer plate 203 and the top plate 205 by bolts through a small column 204. Both the middle layer plate 203 and the top plate 205 are provided with a force application device 4.

[0037] In one embodiment of this utility model, the middle plate 203 is connected to the base plate 201 by a large column 202 and bolts. A power motor 1201 is provided on the base plate 201. The power motor 1201 is connected to the cam device through a large coupling 1203. By changing the eccentricity of the cam, the loading component is driven to complete the up-and-down repeated movement.

[0038] In one embodiment of the present invention, the loading assembly includes a Scottish yoke 10 and circular flange linear bearings 9 respectively mounted on the bottom plate 201, the middle plate 203 and the top plate 205. The Scottish yoke 10 is connected to a torque sensor 7 via a coupling 6.

[0039] In one embodiment of this utility model, the force application device 4 includes a spring connector 402, a tension / compression spring 406, a bushing connector 404, a pressure sensor 401, a locking nut 407, and a straight rod 405 with partial threads. The tension / compression spring 406 is fixedly mounted on the frame by bolts through the spring connector 402, and the force application device 4 controls the magnitude of the spring force through the locking nut 407.

[0040] In one embodiment of this utility model, the force application device 4 is connected to the bushing 503 through the bushing connector 404 and transmits the required torque. The cam device 11 includes a cam bracket and a cam. The left side of the cam is connected to the rotating shaft of the motor 1201 through the coupling 1203, and the right side is connected to the cam bracket.

[0041] In one embodiment of this utility model, the cam device 11 can change the eccentricity by replacing the cam, and by changing the eccentricity, it drives the Scottish yoke 10 to move up and down linearly during movement, so as to realize the rocker arm shaft 502 to rotate repeatedly within a certain angle.

[0042] In one embodiment of this utility model, the working method of a high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing is as follows:

[0043] Before each rocker arm shaft and bushing wear test, first check for leaks in the cooling water circulation system and for any loose connections on the frame. Once these are confirmed, clamp the test specimen. Open the resistance high-temperature furnace, remove the connecting bolts of the rocker arm shaft clamping device, and then place the test specimen into the fixture. After confirming its position, tighten the bolts to clamp the specimen, close the furnace, and lock it. Next, adjust the cam eccentricity. After calculating the required eccentricity, loosen the set screw, manually rotate the stroke bolt to adjust it to the required eccentricity, and then tighten the set screw to prevent misalignment. Then, apply torque. Adjust the force applied by the force application device to the required magnitude. After confirming that everything is correct, turn on the control computer of the testing equipment, set the required heating temperature, and wait for the temperature to reach the required level. Then, set the required speed and start the power motor and cooling water circulation system. Finally, wait for the test to end. During operation, the testing machine automatically records the number of motor rotations, and the torque sensor records the frictional torque between the rocker arm shaft and bushing in real time. When stopping the test, first wait for the high-temperature furnace to cool down to room temperature. After the high-temperature furnace reaches room temperature, turn off the cooling water circulation system, turn on the high-temperature furnace, remove the clamping device, take out the samples one by one, and record the test parameters.

[0044] In one embodiment of this utility model, the working results of a high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing are as follows: Figure 8 As shown in the half-sectional view, the stress distribution inside the bushing exhibits significant non-uniformity. The stress is mainly concentrated in the bushing edge region, especially in the area in contact with the loaded component. This indicates that the edge is the primary area of ​​stress concentration, and the stress value gradually decreases as it extends to the other side. This stress distribution characteristic reflects the stress state of the bushing under actual working loads, providing an important reference for subsequent bushing design optimization and performance improvement.

[0045] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing, characterized in that, The device includes a frame on which a test assembly is mounted. The test assembly includes a rocker arm shaft clamping device for clamping the rocker arm shaft, and a resistance-type square high-temperature furnace heating device is arranged between the rocker arm shaft clamping devices.

2. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 1, characterized in that, The rocker arm shaft clamping device includes a left rocker arm shaft clamp that is connected to the frame with a bearing and a right rocker arm shaft clamp that is connected to the torque sensor with a coupling. The right rocker arm shaft clamp is formed by connecting a flange cooling water circulation system and a special clamp. The bearing axis connected to the left rocker arm shaft clamp is coaxial with the torque sensor.

3. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 1, characterized in that, The frame is provided with a base plate. Above the base plate, a middle plate and a top plate are installed in sequence via large and small columns. The rocker arm shaft clamping device, the resistance-type square high-temperature furnace heating device, and the torque sensor are installed on the middle plate. Horizontal adjustable support casters are provided on the underside of the base plate.

4. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 3, characterized in that, The middle layer plate is provided with positioning holes that connect to the top plate. The positioning holes are connected to the middle layer plate and the top plate by small columns and bolts. Both the middle layer plate and the top plate are provided with force application devices.

5. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 4, characterized in that, The middle layer plate is connected to the base plate by large columns and bolts. A power motor is installed on the base plate. The power motor is connected to a variable eccentricity cam device through a coupling, and drives the loading component to complete the up-and-down repetitive movement through the variable eccentricity cam device.

6. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 4, characterized in that, The force-applying device includes a spring connector, a tension / compression spring, a bushing connector, a pressure sensor, a lock nut, and a straight rod with partial threads. The tension / compression spring is fixedly mounted on the frame by bolts through the spring connector.

7. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 5, characterized in that, The loading assembly includes a Scottish yoke and circular flange linear bearings mounted on the bottom plate, middle plate, and top plate, respectively. The Scottish yoke is connected to a torque sensor via a coupling.

8. The high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 5, characterized in that: The cam device includes a cam support and a cam. The left side of the cam is connected to the rotating shaft of the motor via a coupling, and the right side is connected to the cam support.

9. A high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 6, characterized in that, The force-applying device controls the magnitude of the spring force through the tail nut and transmits the required torque through the bushing connector.

10. A high-temperature repeated rotation wear testing machine for rocker arm shaft and bushing according to claim 8, characterized in that, The cam device can change the eccentricity by replacing the cam, and by changing the eccentricity, it drives the Scottish yoke to move up and down in a straight line during movement, so as to realize the rocker arm shaft to rotate repeatedly within a certain angle.

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