CN107340087B - An analog measurement device for high stress contact lubricating oil film friction - Google Patents

Abstract

The invention belongs to the field of high-pair contact elastohydrodynamic friction force measurement, and relates to an analog measurement device for high-stress contact lubricating oil film friction force. Adjustment device, loading rotary device and translation device, the disc drive device is fixed on the upper surface of the support platform near the front edge, the contact between the steel ball and the flat round steel disc simulates the contact between the roller and the bearing raceway, the sensor is fixed and adjusted The device is located at the front of the left and right edges of the translation table to measure the friction force between the steel ball and the disc. The loading rotary device is fixed at the middle of the rear edge of the translation table, and is controlled by adjusting the spring adjustment nut in the loading rotary device. The size of the loading force of the loading plate, its main structure is simple, the design concept is ingenious, the measurement results are accurate, the operation is simple and convenient, the principle is scientific, the use is convenient and flexible, the practicability is strong, the application environment is good, and the market prospect is broad.

Description

An analog measurement device for high stress contact lubricating oil film friction

Technical field:

The invention belongs to the field of high-pair point contact elastohydrodynamic friction force measurement, and relates to an experimental simulation device for friction force measurement, in particular to a simulation measurement device for high-stress contact lubricating oil film friction force, which can measure the friction force of a ball bearing in different motion states. The friction force under the simulation was measured.

Background technique:

A large number of components in the project are in high contact, and depending on the operating conditions, their lubrication states are mostly under elastohydrodynamic lubrication, mixed lubrication and boundary lubrication. The exploration of the lubrication mechanism under mixed lubrication and boundary conditions is the focus of research in the field of tribology. , In particular, the improvement of the surface quality of the contact pair by processing technology and the use of new lubricating materials make it necessary to re-understand the lubrication mechanism, which requires the evaluation of the friction force of the lubricating oil in the contact pair. The high-stress contact lubricating oil The oil film friction force measurement is mainly carried out by a gravitational testing machine. In the prior art, the Chinese patent with the application number CN2736771Y discloses a comprehensive performance evaluation testing machine for lubricating oil, which includes a power device, a friction pair, an oil holding device, and a loading device. , fixed shaft, the friction pair includes a rotor and a stator, the patent uses weights to load, and uses the lever principle to make the stator and the rotor at the friction point slide friction, and the final oil temperature change and friction pair wear marks are recorded through the temperature control device test. To evaluate the anti-wear performance of lubricating oil, the utility model is simple in design, easy to operate, and easy to carry. However, the patent still has the following defects. First, the accuracy of evaluating the anti-friction and anti-wear performance of lubricating oil by wear scars is not high. , There is no accurate standard to judge the size of the wear scar, and the wear scar itself is irregular. Different people have different judgments on the wear scar, which will lead to personnel errors. Second, it needs to be replaced after each test. Repairing the friction pair increases human, material and financial resources. Third, the temperature is easily affected by the external environment, which makes the accuracy of the measurement results low. Fourth, the utility model cannot obtain the test results at the first time, and needs to be calculated. Therefore, in order to overcome the technical defects of the previous measurement devices, a feasible experimental device was developed to accurately measure the friction force of the high-stress contact lubricating oil film, so as to provide data support for its research. In the process, in order to simplify the analysis, the contact between the roller and the bearing raceway is equivalent to the contact between the roller and the plane, and a simulation measurement device for the friction force of the lubricating oil film with high stress contact is designed and prepared.

Invention content:

The purpose of the present invention is to overcome the problems existing in the prior art, seek to design and provide a high-stress contact lubricating oil film friction simulation device, and use the contact between the steel ball and the flat round steel plate to simulate the contact between the roller and the bearing raceway. contact, to obtain friction data with high accuracy and good repeatability, and to provide experimental data support for the study of friction force of high-stress contact lubricating oil film.

In order to achieve the above purpose, the main structure of the high-stress contact lubricating oil film friction simulation device of the present invention includes: a support platform, a disc drive device, a steel ball fixing device, a sensor fixing and adjusting device, a loading rotary device and a translation device device; the supporting platform is a four-legged support structure at the bottom, and the upper ends of the four supporting legs are respectively fixedly connected with the four corners of the table top; the disc drive device is fixedly placed on the upper surface of the supporting platform near the front edge, and its main structure includes: Round steel disk, fixing device, driven pulley, driven shaft, disk drive motor support, disk drive motor, synchronous pulley, fixed disk and sleeve; the round steel disk is fixed on the upper end of the driven shaft, the said The upper end of the round steel plate is provided with a circular fixing device for fixing the round steel plate, the lower end of the driven shaft passes through the fixed through hole on the translation device, and the lower end of the driven shaft is fixed with a driven pulley for The power of the synchronous pulley is transmitted to drive the driven shaft to rotate. The lower end of the driven shaft is close to the upper side of the driven pulley and is covered with a cylindrical hollow sleeve. The upper end of the sleeve is fixedly connected with a fixed plate. It can freely rotate around the chamber in the middle of the sleeve, and bolt holes are opened at the corresponding positions of the peripheral edge of the fixed plate and the fixed through hole to fix the fixed plate on the table and to fix the disk drive device; I-shaped The disk drive motor support of the structure is fixed at the back of the right edge of the table, the notch of the disk drive motor support faces inward, and a disk drive motor for providing power is fixed in the notch. The output shaft is connected with the synchronous pulley through the lower side plate of the disk drive motor support to drive the synchronous pulley to rotate.

The steel ball fixing device is located on the upper side of the round steel plate, and its main structure includes: a steel ball bearing, a steel ball sleeve, a tension wire nut and a steel ball; The outer end of the loading plate in the loading rotary device is connected to transmit the force loaded by the loading rotary device to the steel ball bearing. The lower end of the steel ball bearing is threadedly connected to the cylindrical steel ball sleeve. There are two tension wire nuts disposed on the top, and the included angle between the two tension wire nuts on the steel ball sleeve is 180°; the tension wire is connected with the pressure sensor in the sensor fixing and adjusting device; The lower end of the steel ball sleeve is sleeved with a steel ball, and the lower end of the steel ball is in contact with the round steel disc as a high-stress contact pair, and a pressure sensor is used to observe the change process of the friction force of the contact pair.

The sensor fixing and adjusting device is located at the front of the left and right edges of the translation platform, and its main structure includes: a one-dimensional translation platform, a support foot, a support screw, a sensor connecting plate and a tension pressure sensor; the one-dimensional translation platform and the translation platform It is movably connected and can only move left and right along the translation stage. The upper surface of the one-dimensional translation stage is fixed with a support foot of an L-shaped structure, and the middle of the upper side of the support foot is connected with the lower end of the support screw. The sensor connecting plate is an L-shaped bent plate structure, the lower end is a vertical flat plate structure, and the upper end is a short horizontal plate structure bent to the outside. A tension pressure sensor is fixed in the middle of the inner side of the vertical plate structure, the tension pressure sensor is connected with the tension line nut through a tension wire, and the upper side of the support screw is connected with the short horizontal plate structure of the sensor connection plate, through the tension wire. Adjust the support screw to adjust the height of the sensor connection plate, and further adjust the height of the pressure sensor.

The loading rotary device is fixed at the middle of the rear edge of the translation table, and its main structure includes: a loading plate, a spring adjusting nut, a spring, a spring seat, a supporting side plate, a thrust shaft, a bearing seat and a thrust ball bearing; a hollow cylindrical structure The bearing seat is fixed on the translation table, and a thrust ball bearing is disposed in the intermediate cavity. The thrust ball bearing is connected with the lower end bearing of the thrust shaft. The thrust shaft can rotate freely in the horizontal direction around the thrust ball bearing. The upper side of the thrust shaft is a cuboid plate-like structure, and the middle of the thrust shaft is connected with the spring seat of the plate-like structure, the upper end of the thrust shaft is rotatably connected with one end of the supporting side plate, and the supporting side plate can rotate up and down around the thrust shaft; The other end of the supporting side plate is connected with one end of the loading plate, and the other end of the loading plate is connected with the steel ball bearing for loading the steel ball fixing device; the upper side of the spring seat is fixed with a spring Adjusting nut, the upper end of the spring adjusting nut is provided with a spring, and the upper end of the spring is connected with the bottom of the end of the loading plate close to the supporting side plate, so as to control the magnitude of the loading force of the loading plate by adjusting the spring adjusting nut.

The translation device includes: a table top, a slider, a guide rail, a translation plate, a threaded front seat, a threaded rear seat, a translation screw rod and a fixed through hole; a fixed through hole is opened near the front edge of the table top, and a translation plate is placed on the upper side of the table top , the lower surface of the translation plate is provided with a threaded front seat, the upper surface of the table is provided with a threaded rear seat, the threaded front seat and the threaded rear seat are connected by a translation screw, and the rotation of the translation screw can realize the horizontal movement of the translation plate, and the table The upper surface of the slide plate is provided with a linear guide rail and a slider structure extending along the front and rear directions of the table, and the lower surface of the translation plate is provided with a groove matching the guide rail and the slider, and the slider can slide in the groove to reduce The friction resistance during the movement of the translation plate is eliminated, and the steel ball fixing device, the sensor fixing and adjusting device and the loading rotary device are moved forward and backward through the forward and backward movement of the translation plate to adjust the radius of gyration of the round steel plate.

When the present invention measures the friction force of the high-stress contact lubricating oil film, the specific measurement steps are as follows:

1. Adjustment of radius of gyration and loading force:

First adjust the translation screw to adjust the front and rear position of the translation plate, adjust the radius of gyration of the steel ball through the movement of the table surface, adjust the spring adjustment nut according to the required loading force, and then place the corresponding weight on the loading plate. for accurate loading;

2. Adjustment of the position of the pull pressure sensor:

First adjust the support screw to adjust the height of the sensor connecting plate, so that the tension pressure sensor can reach the required height. After the adjustment, fix the support screw, and then move the one-dimensional translation stage to adjust the required tension force. After the adjustment, fix it. one-dimensional translation stage;

3, the acquisition of friction:

Start the disc drive motor, the disc drive motor drives the driven pulley to rotate through the synchronous pulley, and transmits the power to the driven shaft to drive the circular steel disc to rotate. The circular steel disc and the steel ball together form a high-stress contact pair. The sensor is connected to the loading plate through the tension line in the way of tension. The two tension and pressure sensors are connected to the translation stage. The tension line is tensioned by moving the translation stage. The loading plate is not tightly constrained by the two tension and pressure sensors. , can freely rotate around the loading rotary device; and when the loading plate is constrained by the two tension pressure sensors, the loading plate will have a rotating trend under the action of the contact pair friction, and this trend will be transmitted to the tension pressure sensor. to obtain friction;

4. Online measurement and storage of friction force:

The friction force between the round steel disc and the steel ball is measured by the pull pressure sensor, which is captured by the USB of the data acquisition card and transmitted to the PC side. The PC side converts the analog signal into a digital signal. Program design, realize the combination of LabVIEW and ordinary data acquisition card USB, and then realize the acquisition, processing and data storage of signals, directly read the friction force through the acquisition interface, and complete the online measurement and storage of the friction force;

5. Calibration of measuring equipment:

Using two tension and pressure sensors to calibrate the system error in the measurement process can be achieved. Since the rotation of the loading plate needs to be supported by the thrust ball bearing, if the steel ball is caused to move or move, it must overcome the thrust bearing itself. Rolling friction force, in order to ensure the accuracy of friction force measurement, the friction torque in the thrust ball bearing must be calibrated, using the sensor designed by Chen Jun and others to pull the test, the value measured by the pull pressure sensor is corrected, assuming that the steel ball is hindered The friction torque of the movement is M, and the two tension and pressure sensors are named sensor 1 and sensor 2 to distinguish them. When sensor 1 is fixed and sensor 2 moves at a constant speed, sensor 1 obtains the tension value F ₁ , and sensor 2 obtains F ₂ . Have:

F ₂ X ₂ =F ₁ X ₁ +M (1)

则有In the above formula

then there are

F ₂ =b+F ₁ k (2)

Among them, X ₁ and X ₂ represent the distances from sensor 1 and sensor 2 to the center of rotation, respectively. It should be noted that although the ball-disk in the pull experiment is not in contact, F ₂ in the experiment can be equivalent to the friction force in the system. The actual frictional force exerted by the lubricating oil film on the steel ball after the ball-disk contact, therefore, in order to eliminate the influence of the friction torque in the thrust ball bearing, it is only necessary to read the value _of the sensor F1, the actual frictional force applied by the lubricating oil film to the steel ball F ₂ is calculated by the fitting formula.

Compared with the prior art, the present invention adopts the structure in which the steel ball and the round steel plate cooperate as the high-stress contact pair, and obtains the changing process of the friction force of the contact pair by pulling the pressure sensor from time to time, thereby improving the accuracy and repeatability of the measurement data. , The translation plate can move back and forth along the front and back of the table to adjust the radius of gyration, which has good practicability. The loading rotary device can precisely control the magnitude of the loading force as needed to ensure the accuracy of the measurement results and improve the operation flexibility of the equipment. Its main structure Simple, ingenious design concept, accurate measurement results, simple and convenient operation, scientific principle, convenient and flexible use, strong practicability, good application environment, and broad market prospects.

Description of drawings:

FIG. 1 is a schematic diagram of the main structure principle of the present invention.

FIG. 2 is a schematic diagram of the main structure principle of the disk drive device according to the present invention.

FIG. 3 is a schematic diagram of the main structure principle of the steel ball fixing device involved in the present invention.

FIG. 4 is a schematic diagram of the main structure principle of the sensor fixing and adjusting device according to the present invention.

FIG. 5 is a schematic diagram showing the principle of the main structure of the loading rotary device according to the present invention.

FIG. 6 is a schematic diagram of the longitudinal cross-sectional structural principle of the bearing seat according to the present invention.

FIG. 7 is a schematic diagram of the main structure principle of the translation device involved in the present invention.

Detailed ways:

The present invention will be further described below through embodiments and in conjunction with the accompanying drawings.

Example:

The main structure of the high-stress contact lubricating oil film friction simulation device involved in this embodiment includes: a support platform 1, a disk drive device 2, a steel ball fixing device 3, a sensor fixing and adjusting device 4, a loading and rotating device 5 and The translation device 6; the support platform 1 is a four-legged support structure at the bottom, and the upper ends of the four support legs are respectively fixedly connected with the four corners of the table top 61; the disk drive device 2 is fixed on the upper surface of the support platform 1 and is close to the front edge. , its main structure includes: round steel disc 21, fixing device 22, driven pulley 23, driven shaft 24, disc drive motor support 25, disc drive motor 26, timing pulley 27, fixed disc 28 and sleeve 29 The round steel plate 21 is fixed on the upper end of the driven shaft 24, the upper end of the round steel plate 21 is provided with a circular fixing device 22 for fixing the round steel plate 21, and the lower end of the driven shaft 24 passes through the translation device The fixed through hole 68 on the 6, and the driven pulley 23 is fixed at the lower end of the driven shaft 24 to transmit the power of the synchronous pulley 27 to drive the driven shaft 24 to rotate, and the lower end of the driven shaft 24 is close to the driven belt. The upper side of the wheel 23 is movably sleeved with a cylindrical hollow sleeve 29, the upper end of the sleeve 29 is fixedly connected with a fixed disk 28, the driven shaft 24 can freely rotate around the chamber in the middle of the sleeve 29, and the fixed disk 28 Bolt holes are provided at positions corresponding to the peripheral edge of the fixed through hole 68 to fix the fixed disk 28 on the table top 61 and to fix the disk drive device 2; the disk drive motor support 25 of the I-shaped structure is fixed on the table top At the rear of the right edge of 61, the notch of the disk drive motor support 25 faces inward, and a disk drive motor 26 for providing power is fixed in the notch, and the output shaft of the disk drive motor 26 passes through the disk drive. The lower side plate of the motor support 25 is connected with the synchronous pulley 27 to drive the synchronous pulley 27 to rotate.

The steel ball fixing device 3 is located on the upper side of the round steel plate 21, and its main structure includes: a steel ball support 31, a steel ball sleeve 32, a tension wire nut 33 and a steel ball 34; the steel ball support 31 is a round The rod-shaped structure, the upper end of which is connected with the outer end of the loading plate 51 in the loading rotary device 5, to transmit the force loaded by the loading rotary device 5 to the steel ball bearing 31, and the lower end of the steel ball bearing 31 is threadedly connected to the cylindrical shape. Steel ball sleeve 32, two tension wire nuts 33 are disposed on the outer side of the steel ball sleeve 32, and the included angle between the two tension wire nuts 33 on the steel ball sleeve 32 is 180° ; Connect with the pressure sensor 45 in the sensor fixing and adjusting device 4 through the tension line; the lower end of the steel ball sleeve 32 is covered with a steel ball 34, and the lower end of the steel ball 34 is in contact with the round steel disc 21 as a high-stress contact pair, and the change process of the friction force of the contact pair is observed through the pressure sensor 45 .

The sensor fixing and adjusting device 4 is located at the front of the left and right edges of the translation stage 64, and its main structure includes: a one-dimensional translation stage 41, a support foot 42, a support screw 43, a sensor connection plate 44 and a tension pressure sensor 45; The one-dimensional translation stage 41 is movably connected to the translation stage 64 and can only move left and right along the translation stage 64 . The upper surface of the one-dimensional translation stage 41 is fixedly provided with the L-shaped support feet 42 . The middle of the upper side is connected to the lower end of the support screw 43. The sensor connecting plate 44 is an L-shaped bent plate structure, the lower end is a vertical flat plate structure, and the upper end is a short horizontal plate structure that is bent to the outside. The outer side of the flat plate structure is close to the inner side of the support feet 42, and a tension pressure sensor 45 is fixed in the middle of the inner side of the vertical plate structure. The upper side of the support screw 43 is connected to the short horizontal plate structure of the sensor connection plate 44 , and the height of the sensor connection plate 44 is adjusted by adjusting the support screw 43 , and the height of the pressure sensor 45 is further adjusted.

The loading and rotating device 5 is fixed at the middle of the rear edge of the translation table 64, and its main structure includes: a loading plate 51, a spring adjusting nut 52, a spring 53, a spring seat 54, a supporting side plate 55, thrust shafts 56, 57, The bearing seat 58 and the thrust ball bearing 59; the bearing seat 58 of the hollow cylindrical structure is fixed on the translation table 64, and the thrust ball bearing 59 is disposed in the intermediate cavity, and the thrust ball bearing 59 is connected with the lower end bearing of the thrust shaft 56, The thrust shaft 56 can rotate freely in the horizontal direction around the thrust ball bearing 59. The upper side of the thrust shaft 56 is a rectangular parallelepiped plate-like structure, and the middle of the thrust shaft 56 is connected with the spring seat 54 of the plate-like structure. The upper end of 56 is rotatably connected with one end of the supporting side plate 55, and the supporting side plate 55 can rotate up and down around the thrust shaft 56; the other end of the supporting side plate 55 is connected with one end of the loading plate 51, and the other end of the loading plate 51 is connected. One end is connected with the steel ball support 31 for loading the steel ball fixing device 3; the upper side of the spring seat 54 is fixedly provided with a spring adjusting nut 52, the upper end of the spring adjusting nut 52 is provided with a spring 53, and the upper end of the spring It is connected with the bottom of the end of the loading plate 51 close to the supporting side plate 55 , and is used to control the magnitude of the loading force of the loading plate 51 by adjusting the spring adjusting nut 52 .

The translation device 6 includes: a table 61, a slider 62, a guide rail 63, a translation plate 64, a threaded front seat 65, a threaded rear seat 66, a translation screw 67 and a fixed through hole 68; a fixed through hole is opened near the front edge of the table 61. Hole 68, a translation plate 64 is placed on the upper side of the table 61, a threaded front seat 65 is placed on the lower surface of the translation plate 64, a threaded rear seat 66 is placed on the upper surface of the table 61, the threaded front seat 65 and the threaded rear seat The seat 66 is connected by a translation screw 67. The rotation of the translation screw 67 can realize the horizontal movement of the translation plate 64. The upper surface of the table 61 is provided with a linear guide 63 and a slider 62 extending along the front and rear directions of the table 61. The lower surface is provided with a groove for matching with the guide rail 63 and the slider 62. The slider 62 can slide in the groove to reduce the frictional resistance during the movement of the translation plate 64, and is driven by the translation plate 64 moving back and forth. The steel ball fixing device 3 , the sensor fixing and adjusting device 4 and the loading and rotating device 5 move back and forth to adjust the turning radius of the round steel disc 21 .

When measuring the friction force of the high-stress contact lubricating oil film in this embodiment, the specific measurement steps are as follows:

(1) Adjustment of radius of gyration and loading force:

First adjust the translation screw 67 to adjust the front and rear positions of the translation plate 64, adjust the radius of gyration of the steel ball 34 by moving the position of the table 61, adjust the spring adjustment nut 52 according to the required loading force, and then adjust the corresponding weight Put it on the loading plate 51 for accurate loading;

(2) Adjustment of the position of the pull pressure sensor:

First, adjust the support screw 43 to adjust the height of the sensor connecting plate 44 so that the tension pressure sensor 45 reaches the required height. After the adjustment, fix the support screw 43, and then move the one-dimensional translation stage 41 to adjust the required tension force. , and fix the one-dimensional translation stage 41 after the adjustment;

(3) Acquisition of friction force:

Start the disk drive motor 26, the disk drive motor 26 drives the driven pulley 23 to rotate through the synchronous pulley 27, and transmits the power to the driven shaft 24 to drive the round steel disk 21 to rotate. The round steel disk 21 and the steel ball 34 together form a high For the stress contact pair, the two tension and pressure sensors 45 are connected to the loading plate 51 through tensioning wires in a pairwise manner, and the two tensioning and pressure sensors 45 are connected to the translation stage 64. By moving the translation stage 64, the tensioning wire is tensioned and the loading plate 51 can freely rotate around the loading rotary device 5 without being tightly constrained by the two tension pressure sensors 45; and when the loading plate 51 is constrained by the two tension pressure sensors 45, the contact friction of the loading plate 51 is Under the action of the force, a turning trend will be generated, and the trend will be transmitted to the tension pressure sensor 45, thereby obtaining the friction force;

(4) Online measurement and storage of friction force:

The friction force between the round steel disc 21 and the steel ball 34 is measured by the pull pressure sensor 45, which is captured by the data acquisition card USB5935 and transmitted to the PC side. The PC side converts the analog signal into a digital signal. By calling the dynamic link library, the data acquisition The LabVIEW program is designed to realize the combination of LabVIEW and the common data acquisition card USB5935, and then realize the acquisition, processing and data storage of the signal, and the friction force can be directly read through the acquisition interface to complete the online measurement and storage of the friction force;

(5) Calibration of measuring equipment:

Using two tension and pressure sensors 45 to calibrate the system error in the measurement process can be achieved. Since the rotation of the loading plate 51 needs to be supported by the thrust ball bearing 59, if the steel ball (roller) produces movement or movement trend , the rolling friction force of the thrust ball bearing 59 itself must be overcome. In order to ensure the accuracy of the friction force measurement, the friction torque in the thrust ball bearing 59 must be calibrated. The measured value is corrected. Assuming that the friction torque that hinders the movement of the steel ball 34 is M, the two tension and pressure sensors 45 are named sensor 1 and sensor 2 to distinguish them. When sensor 1 is fixed and sensor 2 moves at a uniform speed, the sensor 1 gets the tension value F ₁ , sensor 2 gets F ₂ , there are:

F ₂ X ₂ =F ₁ X ₁ +M (1)

则有In the above formula

then there are

F ₂ =b+F ₁ k (2)

Among them, X ₁ and X ₂ represent the distances from sensor 1 and sensor 2 to the center of rotation, respectively. It should be noted that although the ball-disk in the pull experiment is not in contact, F ₂ in the experiment can be equivalent to the friction force in the system. The actual friction force exerted by the lubricating oil film on the steel ball after the ball-disk contact, therefore, in order to eliminate the influence of the friction torque in the bearing, this embodiment only needs to read the value _of the sensor F1, and the actual friction applied by the lubricating oil film to the steel ball The force F ₂ is then calculated by the fitting formula.

Claims (3)

1. The utility model provides a simulation measuring device of high stress contact lubricating oil film frictional force which characterized in that its major structure includes: the device comprises a supporting platform, a disc driving device, a steel ball fixing device, a sensor fixing and adjusting device, a loading rotary device and a translation device; the bottom of the supporting platform is a four-leg supporting structure, and the upper ends of the four supporting legs are respectively fixedly connected with four corners of the table board; the fixed supporting platform upper surface of arranging in of disc drive unit is close to leading edge department, and its major structure includes: the device comprises a round steel disc, a fixing device, a driven belt wheel, a driven shaft, a disc drive motor support, a disc drive motor, a synchronous belt wheel, a fixed disc and a sleeve; the circular steel disc is fixedly arranged at the upper end of the driven shaft, a circular fixing device for fixing the circular steel disc is arranged at the upper end of the circular steel disc, the lower end of the driven shaft penetrates through a fixing through hole in the translation device, a driven belt pulley is fixedly arranged at the lower end of the driven shaft and used for transmitting the power of the synchronous belt pulley to drive the driven shaft to rotate, a cylindrical hollow sleeve is movably sleeved at the upper side, close to the driven belt pulley, of the lower end of the driven shaft, the upper end of the sleeve is fixedly connected with a fixed disc, the driven shaft can freely rotate around a cavity in the middle of the sleeve, bolt holes are formed in the corresponding positions of the circumferential edges of the fixed disc and the fixing through; the disk drive motor support with the I-shaped structure is fixed at the back of the right edge of the table board, the notch of the disk drive motor support faces inwards, a disk drive motor for providing power is fixedly arranged in the notch, and the output shaft of the disk drive motor penetrates through the lower side plate of the disk drive motor support to be connected with the synchronous belt pulley for driving the synchronous belt pulley to rotate; the steel ball fixing device is located the upside of circle steel disc, and its major structure includes: the steel ball support, the steel ball sleeve, the tensioning wire nut and the steel ball; the steel ball support is of a round rod-shaped structure, the upper end of the steel ball support is connected with the outer end of a loading plate in the loading slewing device and used for transmitting the force loaded by the loading slewing device to the steel ball support, the lower end of the steel ball support is in threaded connection with a cylindrical steel ball sleeve, two tensioning wire nuts are arranged on the outer side surface of the steel ball sleeve close to the upper part, the included angle between the two tensioning wire nuts on the steel ball sleeve is 180 degrees, and the steel ball support is connected with a pressure sensor in the sensor fixing and adjusting device through a tensioning wire; the lower end of the steel ball sleeve is sleeved with a steel ball, the lower end of the steel ball is in contact with the round steel disc to serve as a high-stress contact pair, and the friction force change process of the contact pair is observed through a pressure sensor; the sensor is fixed and adjusting device is located the translation device, and its major structure includes: the device comprises a one-dimensional translation table, a support foot, a support screw, a sensor connecting plate and a tension pressure sensor; the upper surface of the one-dimensional translation table is fixedly provided with a support foot with an L-shaped structure, the middle of the upper side of the support foot is connected with the lower end of a support screw, the sensor connecting plate is of an L-shaped bent plate structure, the lower end of the sensor connecting plate is of a vertical flat plate structure, the upper end of the support foot is of a short transverse plate structure bent outwards, the outer side of the vertical flat plate structure is tightly attached to the inner side of the support foot, the middle of the inner side of the vertical flat plate structure is fixedly provided with a pull pressure sensor, the pull pressure sensor is connected with a tension line nut through a tension line, the upper side of the support screw is connected with the short transverse plate structure of the sensor connecting plate, the height of the sensor connecting plate is adjusted through adjusting; the loading rotary device is fixedly arranged in the middle of the rear edge of the translation device, and the main structure of the loading rotary device comprises: the device comprises a loading plate, a spring adjusting nut, a spring seat, a supporting side plate, a thrust shaft, a bearing seat and a thrust ball bearing; a thrust ball bearing is arranged in a middle cavity of the hollow cylindrical structure, the thrust ball bearing is connected with a lower end bearing of a thrust shaft, the thrust shaft can freely rotate around the thrust ball bearing in the horizontal direction, the upper side of the thrust shaft is of a cuboid plate-shaped structure, the middle of the thrust shaft is connected with a spring seat of a plate-shaped structure, the upper end of the thrust shaft is rotatably connected with one end of a supporting side plate, and the supporting side plate can rotate up and down around the thrust shaft; the other end of the supporting side plate is connected with one end of a loading plate, and the other end of the loading plate is connected with a steel ball support and used for loading the steel ball fixing device; a spring adjusting nut is fixedly arranged on the upper side of the spring seat, a spring is arranged at the upper end of the spring adjusting nut, and the upper end of the spring is connected with the bottom of one end, close to the supporting side plate, of the loading plate so as to control the loading force of the loading plate by adjusting the spring adjusting nut; the translation device includes: the table comprises a table top, a sliding block, a guide rail, a translation plate, a threaded front seat, a threaded rear seat, a translation screw and a fixing through hole; the sliding device comprises a table top, a sliding plate, a linear guide rail, a sliding block structure, a steel ball fixing device, a sensor fixing and adjusting device and a loading rotary device, wherein a fixing through hole is formed in the position, close to the front edge of the table top, a translation plate is arranged on the upper side of the table top, a threaded front seat is arranged on the lower surface of the translation plate, a threaded rear seat is arranged on the upper surface of the table top, the threaded front seat and the threaded rear seat are connected through a translation screw rod, the translation screw rod rotates to realize horizontal movement of the translation plate, the linear guide rail and the sliding block structure which extend in the front-back direction of the table top are arranged on the upper surface of the table top, a groove matched with the guide rail and the sliding block is formed in the lower surface of the translation plate, the sliding block can slide.

2. The apparatus of claim 1, wherein the one-dimensional translation stage is movably coupled to the translation plate and is capable of moving only left and right along the translation plate.

3. The simulation measuring device for the friction force of the high-stress contact lubricating oil film according to claim 1, characterized in that the specific measuring method is carried out according to the following steps:

(1) adjustment of turning radius and loading force:

firstly, adjusting a translation screw to adjust the front and rear positions of a translation plate, adjusting the turning radius of a steel ball through the movement of the table top position, adjusting a spring adjusting nut according to the required loading force, and then placing a weight with corresponding weight on a loading plate for accurate loading;

(2) adjusting the position of the tension and pressure sensor:

firstly, adjusting a support screw to adjust the height of a sensor connecting plate to enable a tension pressure sensor to reach the required height, fixing the support screw after the adjustment is finished, then moving a one-dimensional translation table to adjust the required tension, and fixing the one-dimensional translation table after the adjustment is finished;

(3) acquiring friction force:

the disc driving motor is started, the disc driving motor drives the driven belt pulley to rotate through the synchronous belt pulley, power is transmitted to the driven shaft to drive the round steel disc to rotate, the round steel disc and the steel ball jointly form a high-stress contact pair, the two tension and pressure sensors are connected with the loading plate in a counter-pulling mode through the tensioning wire, the two tension and pressure sensors are connected to the translation plate, the tensioning wire is tensioned by moving the translation plate, and the loading plate can freely rotate around the loading rotating device under the condition that the loading plate is not tightly restrained by the two tension and pressure sensors; when the loading plate is pulled and restrained by the two pull pressure sensors, the loading plate generates a rotation trend under the action of the friction force of the contact pair, and the trend is transmitted to the pull pressure sensors to further acquire the friction force;

(4) on-line measurement and storage of friction:

measuring the friction force between the round steel disc and the steel ball through a pull pressure sensor, capturing and transmitting the friction force to a PC (personal computer) end through a data acquisition card USB (universal serial bus), converting an analog signal into a digital signal through the PC end, carrying out program design on LabVIEW for data acquisition by calling a dynamic link library, realizing the combination of the LabVIEW and the USB of a common data acquisition card, further realizing the acquisition, processing and data storage of the signal, directly reading out the friction force through an acquisition interface, and finishing the on-line measurement and storage of the friction force;

(5) calibrating the measuring equipment:

the calibration of system errors in the measuring process can be realized by adopting two tension and pressure sensors for opposite pulling, the rotation of a loading plate needs to be realized by supporting through a thrust ball bearing, if a steel ball generates a movement or movement trend, the rolling friction force of the thrust ball bearing needs to be overcome, in order to ensure the accuracy of friction force measurement, the friction torque in the thrust ball bearing needs to be calibrated, the numerical value measured by the tension and pressure sensors is obtained through a sensor opposite pulling experiment, the numerical value measured by the tension and pressure sensors is corrected, the two tension and pressure sensors are respectively named as a sensor 1 and a sensor 2 for distinguishing on the assumption that the friction torque obstructing the movement of the steel ball is M, when the sensor 1 is fixed and the sensor 2 moves at a constant speed, the sensor 1 obtains a tension value F₁The sensor 2 obtains the pulling force value F₂The method comprises the following steps:

F₂X₂＝F₁X₁+M (1)

let in the above formula

Then there is

F₂＝b+F₁k (2)

Wherein, X₁、X₂Respectively, sensor 1 and sensors 2 toDistance of the center of gyration, it should be noted that F in the experiment is not in contact with the ball-disk in the opposite-pull experiment₂Can be equivalent to the actual friction force exerted on the steel ball by the lubricating oil film after the ball-disc contact in the friction force system, therefore, in order to eliminate the influence of the friction torque in the thrust ball bearing, only the sensor F needs to be read₁Of the actual friction force F exerted by the lubricating film on the steel ball₂It is calculated by fitting a formula.

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