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CN-119104306-B - Dynamic friction coefficient measuring device and measuring method for semi-floating ring bearing

CN119104306BCN 119104306 BCN119104306 BCN 119104306BCN-119104306-B

Abstract

The invention discloses a dynamic friction coefficient measuring device and a measuring method for a semi-floating ring bearing, which belong to the technical field of friction coefficient measurement and comprise a shafting component, a power driving mechanism and a tension sensor, wherein the shafting component comprises a sliding optical axis, a semi-floating ring bearing base component and a sliding optical axis supporting component which are correspondingly sleeved on the sliding optical axis, and the semi-floating ring bearing base component and the sliding optical axis supporting component are correspondingly and fixedly supported on a bench base; the power driving mechanism is correspondingly arranged at one end of the shafting component and is in transmission connection with the sliding optical axis through a synchronous belt, and the tension sensor is correspondingly arranged at one end of the semi-floating ring bearing base component and is in transmission connection with the semi-floating ring bearing base component through a traction wire and is used for detecting tangential tension in the rotating process of the sliding optical axis. The dynamic friction coefficient measuring device can meet the dynamic friction coefficient measurement of the semi-floating ring bearing, and can efficiently and accurately measure the dynamic friction coefficient.

Inventors

  • ZHU JUNCHAO
  • ZONG CHEN
  • SHEN HUA
  • YUE PENG
  • LIU QIAN

Assignees

  • 江苏科技大学

Dates

Publication Date
20260508
Application Date
20241107

Claims (7)

  1. 1. A dynamic friction coefficient measuring device for a semi-floating ring bearing, characterized in that the measuring device (100) comprises: The shafting assembly (2), the shafting assembly (2) comprises a sliding optical axis (14), and a semi-floating ring bearing base assembly (15) and a sliding optical axis supporting assembly (16) which are correspondingly sleeved on the sliding optical axis (14), the semi-floating ring bearing base assembly (15) and the sliding optical axis supporting assembly (16) are correspondingly and fixedly supported on the bench base (1), the semi-floating ring bearing base assembly (15) comprises a bearing base outer frame (151) and a floating inner frame (152) which is vertically and slidingly connected in the bearing base outer frame (151), and two ends of the floating inner frame (152) are respectively buckled with a first transparent oil storage tank (154) and a second transparent oil storage tank (158); The bottom of the inner side of the bearing base outer frame (151) is positioned at the lower side of the floating inner frame (152) and is correspondingly provided with a pressure sensor (18), the outer sides of the two sides of the bearing base outer frame (151) are longitudinally provided with guide baffles (153), and the guide baffles (153) limit the floating inner frame (152) in the bearing base outer frame (151); The floating inner frame (152) is internally and fixedly provided with a deep groove ball bearing (159) and an oil supply outer copper sleeve (156) sleeved on the inner ring of the deep groove ball bearing (159), and two ends of the oil supply outer copper sleeve (156) are connected with oil supply outer copper sleeve check rings in a sealing manner; a semi-floating ring bearing (1512) is arranged in the oil supply outer copper sleeve (156) along the axial direction of the oil supply outer copper sleeve, and two ends of the semi-floating ring bearing (1512) are limited in the oil supply outer copper sleeve (156) through bearing retainer rings (1511); The sliding optical axis supporting assembly (16) comprises a sliding bearing base (161) fixedly connected to the rack base (1), a sliding bearing (162) for a sliding optical axis (14) to pass through is arranged in the sliding bearing base (161), a third transparent oil storage groove (163) is correspondingly arranged at two ends of the sliding bearing (162), and an oil outlet is arranged at the lower end of the third transparent oil storage groove (163); the power driving mechanism (4) is correspondingly arranged at one end of the shafting assembly (2) and is in transmission connection with the sliding optical axis (14) through the synchronous belt (3), the counterweight disc assembly (17) is correspondingly sleeved at two ends of the sliding optical axis (14), the counterweight disc assembly (17) comprises a counterweight disc (171) which is sleeved on the sliding optical axis (14) in a sliding mode, a wheel disc clamping jaw (172) sleeved on the sliding optical axis (14) is fixedly connected to one side of the counterweight disc (171), a locking sleeve (173) is connected to one end of the wheel disc clamping jaw (172) away from the counterweight disc (171) in a threaded mode, and the wheel disc clamping jaw (172) can be locked on the sliding optical axis (14) through rotation of one side, close to the counterweight disc (171), of the rotating locking sleeve (173). The tension sensor (9) is correspondingly arranged at one end of the semi-floating ring bearing base assembly (15), and is in transmission connection with the semi-floating ring bearing base assembly (15) through a traction wire (13) and used for detecting tangential tension in the rotating process of the sliding optical axis (14).
  2. 2. A dynamic friction coefficient measuring device for a semi-floating ring bearing according to claim 1, characterized in that the pressure sensor (18) comprises a second sensor base (181) and a pressure probe (182) fixedly arranged on the second sensor base (181), the pressure probe (182) being electrically connected to a control system.
  3. 3. The dynamic friction coefficient measuring device for the semi-floating ring bearing according to claim 2, wherein the tension sensor (9) comprises a first sensor base (91) and a tension test shaft (92) fixedly arranged at the upper end of the first sensor base, the tension test shaft (92) is arranged in parallel with the sliding optical axis (14), a connecting hole (93) is formed in the front end of the tension test shaft (92), the connecting hole (93) is fixedly connected with one end of a traction wire (13), the other end of the traction wire (13) penetrates through a second transparent oil storage groove (158) to be fixedly connected with a limit screw (1510), and the traction wire (13) is vertically arranged with the tension test shaft (92) and the sliding optical axis (14).
  4. 4. The dynamic friction coefficient measuring device for the semi-floating ring bearing according to claim 1, wherein a plurality of oil storage grooves (10) are arranged on the disc surface of the bench base (1) in a communicating mode, and an oil storage disc (7) with a U-shaped structure is arranged on the bench base (1) corresponding to the first transparent oil storage groove (154), the second transparent oil storage groove (158) and the third transparent oil storage groove (163).
  5. 5. The dynamic friction coefficient measuring device for a semi-floating ring bearing according to claim 1, wherein the shafting assembly (2) further comprises a driving pulley assembly (11) correspondingly arranged at one end of the sliding optical axis (14), the driving pulley assembly (11) comprises two groups of rolling bearing bases (112) correspondingly arranged, the rolling bearing bases (112) comprise base frames (1121) fixedly arranged on the bench base (1) and rolling bearings (1122) arranged in the base frames (1121), the inner rings of the two groups of rolling bearings (1122) are fixedly connected with a pulley shaft (111), one end of the pulley shaft (111) is fixedly connected with one end of the sliding optical axis (14) through a diaphragm coupling (12), and a second synchronous pulley (113) is fixedly connected to the pulley shaft (111).
  6. 6. The dynamic friction coefficient measuring device for a semi-floating ring bearing according to claim 5, wherein the power driving mechanism (4) comprises a motor base (6) and a driving motor (5) fixedly arranged on the motor base, a first synchronous pulley (8) is arranged at the power shaft end of the driving motor (5), and the first synchronous pulley (8) and a second synchronous pulley (113) are in transmission connection through a synchronous belt (3).
  7. 7. A dynamic friction coefficient measuring method, characterized in that the measuring device according to claim 6 is used, the measuring method comprising: Step 1, after the measuring device (100) is assembled, the measuring device is installed on the ground of a specific area; Step 2, starting a driving motor (5) according to a preset program, wherein the driving motor (5) drives a first synchronous pulley (8) to rotate in a variable frequency manner, the first synchronous pulley (8) drives a pulley shaft (111) to rotate through a synchronous belt (3) and a second synchronous pulley (113), the pulley shaft (111) drives a sliding optical axis (14) to synchronously rotate through a diaphragm coupling (12), lubricating oil in a gap of a semi-floating ring bearing (1512) is driven to flow in the rotating process of the sliding optical axis (14), oil film force for balancing load force is generated by the lubricating oil based on dynamic pressure effect, and a journal of the sliding optical axis (14) is jacked up, so that the journal of the sliding optical axis (14) is separated from the inner surface of the semi-floating ring bearing (1512), and a floating inner frame (152) for fixing the semi-floating ring bearing (1512) moves up and down relatively along a bearing base outer frame (151), and in the process, a pressure sensor (18) records the sum of the pressure load force, the floating inner frame (152) and the gravity of parts in the floating inner frame (152) and the parts in the process, and the known weight of the floating inner frame (152) and the parts in the sliding optical axis can obtain radial load W generated in the rotating process of the sliding optical axis (14); In the rotating process of the sliding optical axis (14), friction force generated by shearing stress on the journal surface of the sliding optical axis (14) by lubricating oil enables the semi-floating ring bearing (1512) to generate a pulling force which is balanced with the friction force and horizontally faces to the opposite direction, and as the semi-floating ring bearing (1512) is tightly attached to the oil supply outer copper sleeve (156), the pulling force is transmitted to the oil supply outer copper sleeve (156) to enable the oil supply outer copper sleeve to generate rotation tendency or rotate, the pulling force is transmitted to the tension sensor (9) through the traction wire (13) wound on the limit screw (1510), and the tension sensor (9) records a pulling force value in the process, namely a dynamic friction force f; and 4, obtaining the friction factor mu of dynamic friction through a friction factor calculation formula mu=f/W.

Description

Dynamic friction coefficient measuring device and measuring method for semi-floating ring bearing Technical Field The invention relates to the technical field of friction coefficient measurement, in particular to a dynamic friction coefficient measurement device and a dynamic friction coefficient measurement method for a semi-floating ring bearing. Background In the field of engineering and scientific research, the measurement of friction coefficients generally depends on a series of conventional methods and devices. One common method is to use a friction tester that measures the coefficient of friction by applying a force between two test objects and measuring their resistance to relative movement. However, this method is complex to operate, requires expensive instruments and cumbersome data analysis procedures, and these requirements not only increase the cost of the experiment, but also raise the technical threshold. Another common method is a tilted plane test, in which test objects are placed on a tilted plane, and the coefficient of friction is calculated by measuring their sliding speed and tilt angle on the tilted plane. While this approach is relatively simple, there are some limitations, firstly, it requires high accuracy and repeatability of the coefficient of friction, requires precise measurement equipment and instrument calibration, and secondly, inclined plane tests may not be applicable for certain special situations, such as requiring measurement of very low coefficient of friction materials or processing of non-uniform surface materials, and accuracy and repeatability of the results may be affected by skill and experience levels of the operator, which may lead to inconsistent test results. In addition, some dynamic coefficient of friction measurement devices use standard coefficient of friction standards that are measured by applying the standard to a test surface and measuring the force required. Conventional methods of measuring the coefficient of friction are very useful in some situations, but are difficult to apply in the measurement of the coefficient of friction for a particular structure in part. The semi-floating ring bearing is used as a dynamic pressure bearing, a wedge-shaped gap is arranged between a bearing bush and a journal, and a main shaft rotates to drive lubricating oil to flow to form a pressure oil film, so that lubrication and bearing effects are realized. However, in the running process of the semi-floating ring bearing, the oil film pressure dynamically changes along with the speed, the load and the lubrication condition, and the wedge-shaped gap between the bearing bush and the journal is very tiny and extremely sensitive to the flow and the pressure distribution of the lubricating oil, so that the dynamic friction coefficient of the semi-floating ring bearing is extremely difficult to measure. Currently, the conventional dynamic friction coefficient measuring device mainly adopts boundary friction, translational friction and other modes to measure the dynamic friction coefficient, and is difficult to be applied to dynamic friction coefficient measurement of high-speed rotating machinery such as a semi-floating ring bearing. Disclosure of Invention The invention provides a dynamic friction coefficient measuring device and a dynamic friction coefficient measuring method for a semi-floating ring bearing, which can efficiently and accurately measure the dynamic friction coefficient of the semi-floating ring bearing. The invention relates to a dynamic friction coefficient measuring device for a semi-floating ring bearing, which comprises: The shafting assembly comprises a sliding optical axis, a semi-floating ring bearing base assembly and a sliding optical axis supporting assembly which are correspondingly sleeved on the sliding optical axis, and the semi-floating ring bearing base assembly and the sliding optical axis supporting assembly are correspondingly and fixedly supported on the bench base; The power driving mechanism is correspondingly arranged at one end of the shafting assembly and is in transmission connection with the sliding optical axis through a synchronous belt; The tension sensor is correspondingly arranged at one end of the semi-floating ring bearing base assembly and is in transmission connection with the semi-floating ring bearing base assembly through a traction wire, and the tension sensor is used for detecting tangential tension in the sliding optical axis rotating process. Preferably, the semi-floating ring bearing base assembly comprises a bearing base outer frame and a floating inner frame vertically connected in a sliding manner in the bearing base outer frame, and a first transparent oil storage tank and a second transparent oil storage tank are respectively buckled at two ends of the floating inner frame; The bottom of the inner side of the outer frame of the bearing base is positioned at the lower side of the floating inner frame and is