Detection table for rotary friction vibration detection

Abstract

The utility model relates to a detection table for rotary friction vibration detection. The detection table for rotary friction vibration detection comprises a base, a sliding block moving in the left-right direction is installed on the base in a sliding mode, a driving mechanism for driving an installation base to move is arranged on the sliding block, a fixing piece is arranged on the upper side of the sliding block, and the front side and the rear side of the fixing piece are each provided with a carbon brush connecting piece used for installing a friction sample. A gear motor is arranged on the base, a rotating shaft is fixedly connected to the end of an output shaft of the gear motor, the axis of the rotating shaft extends in the left-right direction, the rotating shaft penetrates through the connecting piece, the two carbon brush connecting pieces are symmetrically arranged on the two sides of the rotating shaft, and conductive sliding rings and friction disc fixing pieces are arranged on the rotating shaft at intervals in the axial direction. Compared with the prior art, the detection table for rotary friction vibration detection can adjust the normal load between the friction sample and the friction disc sample, and is wider in application range and higher in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of friction vibration detection, and particularly relates to a detection platform for rotating friction vibration detection. Background Technique

[0002] Friction is a very common phenomenon in daily life and engineering fields. For example, in actual applications such as machine tool processing systems, vehicle braking systems, and robot connecting joint systems, there are components that are in contact with each other and move relatively. The contact surfaces of these components will generate friction, exhibit different interfacial tribological behaviors, and undergo friction self-excited vibration. Strong friction self-excited vibration will exacerbate the wear of components, reduce the accuracy and reliability of mechanical equipment, lead to a significant shortening of the service life, seriously affect the normal operation of the equipment, and even cause serious safety accidents. Therefore, the friction self-excited vibration phenomenon existing in mechanical equipment has always been taken seriously by relevant researchers. In addition, effective exploration of the interfacial tribological behavior can also provide useful references for the preparation and structural design of friction pair materials. Generally speaking, building a tribological behavior simulation detection platform to simulate tribological behavior and using different experimental conditions and characterization analysis methods to study the influencing factors of the interfacial tribological behavior of mechanical systems is a research method widely welcomed by scholars for engineering applications at the present stage.

[0003] Most of the existing friction vibration detection platforms can achieve reciprocating motion and are used to simulate tribological behavior under linear reciprocating motion. However, in some existing engineering applications, such as the wheel-rail contact and disc braking of vehicles, the contact methods of friction pairs belong to rotational contact, which are quite different from the linear reciprocating friction contact method and interfacial tribological behavior, and cannot be simulated on a linear reciprocating friction vibration detection platform.

[0004] When the existing friction vibration detection platform simulates tribological behavior, the vibration signals generated during the operation of power components such as the driving motor will be transmitted to the friction interface through the rigid connection structure of the detection platform, causing the superposition of friction interface vibration signals. In addition, the vibration signals of the friction interface are transmitted to the support components of the detection platform through the rigid connection structure, which is very likely to cause resonance of the rigid connection structure of the detection platform, and the resonance signal can return to the friction interface through the rigid connection structure of the detection platform, masking the vibration characteristics of the friction interface. In short, the resonance signals of the rigid structure of the detection platform and the vibration signals of the driving components themselves, etc., which are non-friction interface vibration signals, can be classified as interference signals that affect the test accuracy. The existence of interference signals is not conducive to accurately studying the interfacial tribological behavior of friction pairs.

[0005] The Chinese invention patent application with the publication number of CN111307437A discloses a rotary tribological behavior simulation test bench for realizing vibration decoupling. The test bench includes a test bench base, a lower friction specimen is arranged on the test bench base, an upper friction specimen is arranged above the lower friction specimen, a rotation system is arranged between the lower friction specimen and the test bench base, the upper friction specimen is connected with a loading system, and an acceleration sensor and a three-axis force sensor are arranged on the loading system. However, when the test bench is used, the normal load of the friction specimen cannot be adjusted, which has certain limitations in use. Utility Model Content

[0006] In order to solve the above technical problems, the present utility model provides a test bench for rotary friction vibration detection.

[0007] The technical solution of a test bench for rotary friction vibration detection of the present utility model is as follows:

[0008] A test bench for rotary friction vibration detection includes a base, a slider that is slidably installed on the base and moves in the left-right direction is provided on the base, a driving mechanism for driving the mounting seat to move is provided on the slider, a fixing member is provided on the upper side of the slider, carbon brush connecting members for installing friction specimens are respectively provided on the front and rear sides of the fixing member, a reduction motor is provided on the base, the end of the output shaft of the reduction motor is fixedly connected with a rotating shaft, the axis of the rotating shaft extends in the left-right direction, the rotating shaft passes through the connecting member, and the two carbon brush connecting members are symmetrically arranged on both sides of the rotating shaft. An electrically conductive slip ring and a friction disc fixing member are axially and spacedly arranged on the rotating shaft.

[0009] Further, the driving mechanism includes a driving motor and a lead screw. The lead screw is rotatably installed on the base. A slide rail matching the slider is provided on the base. The slider has a threaded hole matching the lead screw. The driving motor is fixedly connected to the base, and the output shaft of the driving motor is fixedly connected with the lead screw.

[0010] Further, the fixing member has an inverted U-shaped structure. The lower ends of the two vertical parts of the fixing member are fixedly connected to the upper end of the slider. The rotating shaft is located in the central hole of the fixing member. The two carbon brush connecting members are respectively fixedly connected to the outer side surfaces of the two vertical parts of the fixing member.

[0011] Further, the electrically conductive slip ring is fixedly connected to the end of the rotating shaft far from the reduction motor, and the friction disc fixing member is arranged at the end of the rotating shaft close to the reduction motor.

[0012] Further, the friction disc fixing member includes a connecting sleeve sleeved on the rotating shaft. A fixing bolt fixed to the rotating shaft is provided on the outer wall of the connecting sleeve. The connecting sleeve is key-connected with the output shaft of the reduction motor, and the connecting sleeve is fixedly connected with the output shaft of the reduction motor through a setscrew.

[0013] Furthermore, one end of the connecting sleeve away from the reduction motor is provided with a connecting flange coaxially arranged with the connecting sleeve, and the connecting flange is fixedly connected with the friction disc specimen through a bolt assembly.

[0014] The utility model provides a test bench for rotary friction vibration detection. Compared with the prior art, its beneficial effects are as follows:

[0015] When the test bench for rotary friction vibration detection of the utility model is in use, the friction specimen is fixed on the carbon brush connecting piece, and the friction disc specimen is fixed on the friction disc fixing piece. The driving motor controls the slider to move left and right along the lead screw and the slide rail, and the normal preload between the friction specimen and the friction disc specimen is adjusted by the distance of the slide table movement to ensure that there is an appropriate normal preload at the beginning of the measurement. Compared with the prior art, the test bench for rotary friction vibration detection of the utility model can adjust the normal load between the friction specimen and the friction disc specimen, has a wider application range and stronger adaptability. Description of the Drawings

[0016] Figure 1 is the structural schematic diagram of the test bench for rotary friction vibration detection of the utility model Figure 1 ;

[0017] Figure 2 is the structural schematic diagram of the test for rotary friction vibration detection of the utility model Figure 2 ;

[0018] Figure 3 is a partial structural schematic diagram of the test bench for rotary friction vibration detection of the utility model;

[0019] In the figure: 1, cross beam; 2, longitudinal beam; 3, vertical beam; 4, corner code; 5, slide rail; 6, slider; 7, lead screw; 8, fixing piece; 9, carbon brush connecting piece; 10, rotating shaft; 11, reduction motor; 12, connecting sleeve; 13, connecting flange; 14, friction disc specimen; 15, conductive slip ring. Specific Embodiments

[0020] The following further describes the utility model in detail with reference to the drawings and specific embodiments:

[0021] A specific embodiment of the test bench for rotary friction vibration detection of the utility model is as Figures 1 to 3As shown in the figure, it includes a base. The base includes two cross beams 1, three longitudinal beams 2, and two vertical beams 3. The three longitudinal beams 2 are fixedly connected to the upper sides of the left ends of the two cross beams 1 through angle codes 4. The two vertical beams 3 are connected to the front ends of the longitudinal beams 2 through angle codes 4. The lower end surfaces of the longitudinal beams 2 and the lower end surfaces of the cross beams 1 are coplanar. The cross beams 1 extend in the left-right direction, and the longitudinal beams 2 extend in the front-back direction. There are two slide rails 5 extending in the left-right direction between the two cross beams 1. The cross section of the slide rails 5 is T-shaped. Two sliders 6 are slidably mounted on the two slide rails 5. The sliders 6 are provided with two chutes matching the slide rails 5. A driving mechanism for driving the sliders 6 to move along the slide rails 5 is installed on the base. The driving mechanism includes a driving motor and a lead screw 7.

[0022] The lead screw 7 is arranged between the two slide rails 5. The lead screw 7 is parallel to the slide rails 5. The two ends of the lead screw 7 are rotatably mounted on the base through bearings. The driving motor is fixedly connected between the two slide rails 5. The output shaft of the driving motor is fixedly connected to the end of the lead screw 7. The sliders 6 are provided with threaded holes matching the lead screw 7. When the driving motor drives the lead screw 7 to rotate, the lead screw 7 drives the sliders 6 to slide along the slide rails 5.

[0023] A fixing member 8 is provided on the upper side of the slider 6. Carbon brush connecting members 9 for installing friction specimens are respectively provided on the front and rear sides of the fixing member 8. A reduction motor 11 is installed on the base. The end of the output shaft of the reduction motor 11 is fixedly connected with a rotating shaft 10. The axis of the rotating shaft 10 extends in the left-right direction. The rotating shaft 10 passes through the connecting member. The two carbon brush connecting members 9 are symmetrically arranged on both sides of the rotating shaft 10. Conductive slip rings 15 and a friction disc fixing member 8 are axially spaced on the rotating shaft 10. The fixing member 8 has an inverted U-shaped structure. The lower ends of the two vertical portions of the fixing member 8 are fixedly connected to the upper end of the slider 6. The rotating shaft 10 is located in the central hole of the fixing member 8. The two carbon brush connecting members 8 are respectively fixedly connected to the outer side surfaces of the two vertical portions of the fixing member 8.

[0024] The conductive slip ring 6 is fixedly connected to the end of the rotating shaft 10 away from the reduction motor 11. The friction disc fixing member 8 is arranged at the end of the rotating shaft 10 close to the reduction motor 11. The friction disc fixing member 8 includes a connecting sleeve 12 sleeved on the rotating shaft 10. Fixing bolts fixed to the rotating shaft 10 are provided on the outer wall of the connecting sleeve 12. The connecting sleeve 12 is key-connected to the output shaft of the reduction motor 11. The connecting sleeve 12 is fixedly connected to the output shaft of the reduction motor 11 through a setscrew. A connecting flange 13 coaxial with the connecting sleeve 12 is provided at the end of the connecting sleeve 12 away from the reduction motor 11. The connecting flange 13 is fixedly connected to the friction disc specimen through a bolt assembly.

[0025] When the testing platform for rotational friction vibration detection of the present utility model is in use, the friction specimen is fixed on the carbon brush connecting member 9, and the friction disc specimen is fixed on the friction disc fixing member 8. The slider 6 is controlled by the driving motor to move left and right along the lead screw 7 and the slide rail 5, and the magnitude of the normal preload between the friction specimen and the friction disc specimen is adjusted by the distance of the slide table movement to ensure that there is an appropriate normal preload at the beginning of the measurement. Compared with the prior art, the testing platform for rotational friction vibration detection of the present utility model can adjust the normal load between the friction specimen and the friction disc specimen, has a wider range of use and stronger adaptability.

[0026] When the testing platform for rotational friction vibration detection of the present utility model is detecting, the friction specimens on the two carbon brush connecting members 9 need to be respectively connected in parallel to the circuit, and the wires connecting the two friction specimens are respectively passed through the first and second acquisition holes in the four-channel current collector. A path of constant current power supply - conductive slip ring 15 circular shaft - friction disc fixing member 8 - friction specimen - constant current power supply is formed, and the four-channel current collector can collect the magnitude of the current passing through the two friction specimens in real time. At this time, the control program turns on the acquisition function of the four-channel current collector. The rotational speed of the reduction motor 11 is precisely controlled by changing the external liquid crystal digital display speed regulator and replacing the reducers with different reduction ratios. Next, according to the real-time readings of the four-channel current collector, the current fluctuation conditions of the friction specimen at different relative speeds are recorded. The total circuit current value of the constant current power supply is changed, and the experiment is repeated multiple times. Finally, this series of detection processes are used to determine the rotational friction properties between materials under different speed conditions, providing important data for the study of rotational friction behavior. The testing platform for rotational friction vibration detection of the present utility model can detect the rotational friction situation of the friction specimen, and can obtain the current fluctuation image during the rotational friction process without expensive instruments and complex data analysis processes. Therefore, it has the following beneficial effects. Compared with some traditional rotational friction detection methods, the required instrument and equipment costs are lower, which makes the technology more economical and feasible, and the detection process is relatively simple, without complex data analysis processes or professional knowledge, which reduces the technical threshold and enables more people to carry out rotational friction detection.

[0027] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A test bench for rotational friction vibration detection, characterized in that, It includes a base, on which a slider moving in the left - right direction is slidably mounted. A driving mechanism for driving the mounting base to move is provided on the slider. A fixing member is provided on the upper side of the slider. Carbon brush connectors for mounting friction specimens are respectively provided on the front and rear sides of the fixing member. A reduction motor is provided on the base. The end of the output shaft of the reduction motor is fixedly connected to a rotating shaft, and the axis of the rotating shaft extends in the left - right direction. The rotating shaft passes through the connector, and the two carbon brush connectors are symmetrically arranged on both sides of the rotating shaft. Conductive slip rings and a friction disc fixing member are axially spaced on the rotating shaft.

2. The test bench for rotational friction vibration detection according to claim 1, characterized in that The driving mechanism includes a driving motor and a lead screw. The lead screw is rotatably mounted on the base. A slide rail matching the slider is provided on the base. The slider has a threaded hole matching the lead screw. The driving motor is fixedly connected to the base, and the output shaft of the driving motor is fixedly connected to the lead screw.

3. The test bench for rotational friction vibration detection according to claim 2, characterized in that, The fixing member has an inverted U - shaped structure. The lower ends of the two vertical parts of the fixing member are fixedly connected to the upper end of the slider. The rotating shaft is located in the central hole of the fixing member, and the two carbon brush connectors are respectively fixedly connected to the outer side surfaces of the two vertical parts of the fixing member.

4. The inspection table for rotational friction vibration detection according to claim 1, characterized in that The conductive slip ring is fixedly connected to the end of the rotating shaft far from the reduction motor, and the friction disc fixing member is arranged at the end of the rotating shaft close to the reduction motor.

5. The inspection table for rotational friction vibration detection according to claim 4, characterized in that, The friction disc fixing member includes a connecting sleeve sleeved on the rotating shaft. Fixing bolts fixed to the rotating shaft are provided on the outer wall of the connecting sleeve. The connecting sleeve is key - connected to the output shaft of the reduction motor and fixedly connected to the output shaft of the reduction motor by a setscrew.

6. The test bench for rotational friction vibration detection according to claim 5, characterized in that, A connecting flange coaxial with the connecting sleeve is provided at the end of the connecting sleeve far from the reduction motor, and the connecting flange is fixedly connected to the friction disc specimen through a bolt assembly.

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