An on-line method and system for measuring the wear resistance of floating friction plates

Abstract

The present application relates to the field of testing the wear resistance of solid materials with mechanical stress, and particularly relates to an online measurement method and system for the wear resistance of a floating friction plate, the method comprising the following steps: installing the floating friction plate on a measurement shaft, driving the measurement shaft to accelerate to a rotating speed by a servo motor through a clutch, applying a preset pressure on the floating friction plate by a loading device through a counter-abrasive piece, at a preset measurement node, the loading device is first unloaded, then the clutch is disconnected, a data acquisition system records a complete rotating speed-time curve of the free deceleration of the measurement shaft under the action of its own resistance torque, calculates the average angular acceleration of the measurement shaft in the process, and further calculates the mass wear amount of the floating friction plate between two measurements. The embodiment of the present application measures the angular acceleration of the floating friction plate when the floating friction plate freely decelerates under the action of the constant resistance torque of the measurement shaft, calculates the wear amount of the floating friction plate through the change of the moment of inertia of the floating friction plate, and realizes online measurement.

Description

Technical Field

[0001] The invention relates to the field of testing the anti-wear performance of solid materials by using mechanical stress, and in particular to an online measurement method and system for the anti-wear performance of a floating friction plate. Background Art

[0002] Conventional methods for measuring the wear of floating friction plates include weighing after disassembly and measuring thickness after disassembly. Although the results of these two methods are accurate, the operations are cumbersome, time-consuming and labor-intensive, and they destroy the original assembly state of the components, affecting the efficiency and accuracy of subsequent wear measurements. Summary of the Invention

[0003] The object of the present invention is to provide an online measurement method and system for the anti-wear performance of a floating friction plate, which aims to measure the wear amount of the floating friction plate online without removing the floating friction plate from a test bench.

[0004] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0005] An online measurement method for the wear resistance of a floating friction plate comprises the following steps:

[0006] Installation and wear: The floating friction plate is installed on the measuring shaft. The servo motor drives the measuring shaft to accelerate to the speed n1 through the clutch. The loading device applies a preset pressure to the floating friction plate through the wear piece, and the friction and wear test of the specified period begins.

[0007] Decoupling: At a preset measurement node, the loading device is first unloaded to completely separate the counter-wear member from the floating friction plate, and then the clutch is disengaged;

[0008] Acquisition: The data acquisition system records the resistance torque M of the measuring axis. R The complete speed-time curve of free deceleration under the action of the brake, until it stops or reaches the preset cut-off speed n2;

[0009] Calculation: According to the speed-time curve, calculate the average angular acceleration α of the measuring axis during this process n , and then calculate the mass wear Δm of the floating friction plate between two measurements:

[0010] ;

[0011] in, is the resistance torque of the measuring shaft when it is idling, α n The average angular acceleration of the measuring axis is obtained for the nth acquisition, r1 is the outer radius of the friction plate, and r2 is the inner radius of the friction plate.

[0012] Furthermore, it also includes measuring the resistance torque M when the measuring shaft is idling R Steps:

[0013] Startup: Without installing the floating friction plate, the drive system drives the measuring shaft to accelerate to a speed n1 through the clutch;

[0014] Decoupling: the clutch is quickly disconnected to separate the drive system from the measuring shaft;

[0015] Acquisition: The data acquisition system records the resistance torque M of the measuring axis. R The complete speed-time curve of free deceleration under the action of the brake, until it stops or reaches the preset cut-off speed n2;

[0016] Calculation: Based on the speed-time curve, calculate the average angular acceleration α1 during this process, and then calculate the constant resistance torque of the measuring axis .

[0017] Furthermore, it also includes measuring the resistance torque M when the measuring shaft is idling R Steps:

[0018] A torque sensor is used to connect the drive system and the measuring shaft. Without installing the floating friction plate, the drive system accelerates the measuring shaft to a speed n1 through the clutch and the torque sensor. At this time, the reading of the torque sensor is the constant resistance torque on the measuring shaft. .

[0019] An online measurement system for the wear resistance of a floating friction plate, the online measurement system being used to perform an online measurement method, the online measurement system comprising a test bench and a drive system, a clutch, a rotating table, a loading device, and a data acquisition and processing system mounted thereon;

[0020] The drive system is used to drive the floating friction plate to rotate, the clutch connects the drive system and the floating friction plate, the turntable is used to carry the floating friction plate and constrain its rotation axis, the loading device is used to drive the wear member to apply positive pressure to the floating friction plate to simulate friction and wear under actual working conditions, and the data acquisition and processing system is used to monitor the speed and angular displacement of the measuring shaft in real time after the drive system is decoupled from the floating friction plate through the clutch, record the speed-time data of the deceleration process, and calculate the angular acceleration, moment of inertia and final wear amount based on the built-in algorithm.

[0021] Furthermore, the rotating table includes a first bearing seat and a measuring shaft. The first bearing seat is fixedly connected to the test table. The measuring shaft and the first bearing seat form a rotating pair. The measuring shaft is used to install the floating friction plate.

[0022] Furthermore, the driving system includes a servo motor, a first elastic coupling and a driving shaft connected in sequence, and the driving shaft is connected to the measuring shaft through the clutch.

[0023] Furthermore, the data acquisition and processing system includes a photoelectric encoder, a second elastic coupling, a synchronization shaft, and an industrial computer connected to the photoelectric encoder, which are sequentially connected. The synchronization shaft is coaxially connected to the measuring shaft.

[0024] Furthermore, a flange is formed at one end of the measuring shaft, and the flange is connected to the floating friction plate and the synchronization shaft by bolts.

[0025] Furthermore, the clutch includes a friction master disc, a friction male disc, a second bearing seat and a cylinder, wherein the friction master disc is a tapered hole formed at the end of the measuring shaft, and the friction male disc is a tapered head formed at the end of the driving shaft, and the inner wall of the tapered hole and the outer wall of the tapered head are preset with anti-slip grooves. The driving shaft is connected to the actuator of the cylinder through the second bearing seat, and the cylinder is fixedly connected to the test bench. The cylinder is used to drive the second bearing seat to move along the axial direction of the driving shaft so that the friction master disc and the friction male disc are in contact or separation.

[0026] Furthermore, the drive system further includes a torque sensor, which is connected to the drive system and the clutch.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] Provided are an online measurement method and system for the anti-wear performance of a floating friction plate. By measuring the angular acceleration of the floating friction plate during free deceleration under the action of a constant resistance torque of a measuring shaft, the wear amount of the floating friction plate is calculated based on the change in the moment of inertia of the floating friction plate, thereby achieving online measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0030] Figure 1 This is a block diagram of the overall structure of an embodiment of the present invention;

[0031] Figure 2 A three-dimensional diagram of a driving mechanism for a floating friction plate according to an embodiment of the present invention;

[0032] Figure 3 A front view of a driving mechanism of a floating friction plate according to an embodiment of the present invention;

[0033] Figure 4 for Figure 3 Cross-sectional view in the AA direction;

[0034] The numbers in the figure represent the following:

[0035] 1-Floating friction plate; 2-Drive system; 21-Servo motor; 22-First elastic coupling; 23-Drive shaft; 3-Clutch; 31-Friction mother disc; 32-Friction male disc; 33-Second bearing seat; 34-Cylinder; 4-Turntable; 41-First bearing seat; 42-Measuring axis; 5-Loading device; 51-Wearing part; 6-Data acquisition and processing system; 61-Photoelectric encoder; 62-Second elastic coupling; 63-Synchronous axis. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Conventional methods for measuring the wear of the floating friction plate 1 (such as weighing or measuring thickness after disassembly) produce accurate results, but are cumbersome, time-consuming, and labor-intensive, and may damage the original assembly state of the components.

[0038] To solve this problem, this solution proposes an online measurement method for the anti-wear performance of the floating friction plate 1. This method accurately measures the rotational dynamic parameters of the floating friction plate 1 during free deceleration, calculates the change in its moment of inertia in real time, and thus infers its mass wear in a non-contact and highly efficient manner.

[0039] The core principle of the online measurement method is that the wear of the floating friction plate 1 directly leads to a decrease in its mass m, which in turn reduces its own moment of inertia I P The wear amount of mass Δm and the change of moment of inertia ΔI decrease P In a linearly proportional relationship, the moment of inertia of the floating friction plate 1 The change will be reflected in the change of the angular acceleration α of the floating friction plate 1. Through calibration and continuous monitoring, the change of the angular acceleration α can be accurately converted into the wear amount Δm of the floating friction plate 1.

[0040] Based on this, the present invention proposes an online measurement system for measuring the change in the moment of inertia of a floating friction plate during free deceleration.

[0041] refer to Figure 1 The online measurement system includes a test bench and a drive system 2, a clutch 3, a rotating table 4, a loading device 5 and a data acquisition and processing system 6 installed thereon.

[0042] The drive system 2 is used to drive the floating friction plate 1 to rotate; the clutch 3 connects the drive system 2 and the floating friction plate 1, and is used to achieve rapid and reliable decoupling and engagement of the drive system 2 and the floating friction plate 1; the turntable 4 is used to carry the floating friction plate 1 and ensure its rotation accuracy; the loading device 5 is used to drive the wear member 51 to apply a controllable positive pressure to the floating friction plate 1 to simulate the friction and wear under actual working conditions; the data acquisition and processing system 6 is used to monitor the speed and angular displacement of the measuring shaft 42 in real time after the drive system 2 is decoupled from the floating friction plate 1 through the clutch 3, record the speed-time data of the deceleration process, and calculate the angular acceleration, moment of inertia and final wear amount based on the built-in algorithm.

[0043] Furthermore, the rotating table 4 includes a first bearing seat 41 and a measuring shaft 42. The first bearing seat 41 is fixedly connected to the test bench. The measuring shaft 42 and the first bearing seat 41 form a rotating pair. The measuring shaft 42 is used to install the floating friction plate 1. The measuring shaft 42 is designed to be lightweight to reduce its own rotational inertia, thereby improving the measurement sensitivity of the change in the rotational inertia of the floating friction plate 1.

[0044] The online measurement method includes the following steps:

[0045] Step 1a, system calibration:

[0046] Step 1a1, starting: without installing the floating friction plate 1, the driving system 2 drives the measuring shaft 42 to rotate to a preset stable speed n1 through the clutch 3.

[0047] Step 1a2, decoupling: the clutch 3 is quickly disconnected to separate the drive system 2 from the measuring shaft 42.

[0048] Step 1a3, acquisition: the data acquisition system records the complete speed-time curve of the measuring shaft 42 as it decelerates freely under the action of the resistance torque until it stops or reaches the preset cut-off speed n2.

[0049] Step 1a4, calculation: Calculate the average angular acceleration α1 during this process based on the speed-time curve.

[0050] At this time, the rotational inertia of the system is only the rotational inertia I1 of the measuring shaft 42 itself. Therefore, the constant resistance torque on the measuring shaft 42 is for:

[0051] ;

[0052] On the other hand, a simpler approach can be used for system calibration:

[0053] Step 1b: Use a torque sensor to connect the drive system 2 and the measuring shaft 42. Without installing the floating friction plate 1, the drive system 2 drives the measuring shaft 42 to rotate to a preset stable speed n1 through the clutch 3 and the torque sensor. At this time, the reading of the torque sensor is the constant resistance torque on the measuring shaft 42. .

[0054] Step 2, wear and online measurement:

[0055] Step 2.1, installation and wear: install the floating friction plate 1 on the measuring shaft 42, the servo motor 21 accelerates the measuring shaft 42 to the same stable speed n1 as step 1, the loading device 5 applies a preset pressure to the floating friction plate 1, and starts the friction and wear test of the specified period.

[0056] Step 2.2, decoupling: At a preset measurement node (such as reaching a specified time or number of revolutions), the loading device 5 is first unloaded to completely separate the wear member 51 from the floating friction plate 1, and then the clutch 3 is disconnected.

[0057] Step 2.3, acquisition: The data acquisition system records the complete speed-time curve of the measuring shaft 42 as it decelerates freely under the action of the resistance torque until it stops or reaches the preset cut-off speed n2.

[0058] Step 2.4, calculation: Based on the speed-time curve, calculate the average angular acceleration α of the measuring shaft 42 during this process, and then calculate the mass wear Δm of the floating friction plate 1. The specific calculation process is as follows.

[0059] For a floating friction plate 1 with a shape similar to a ring, its moment of inertia I P The relationship with mass m is:

[0060] ;

[0061] m is the mass of the friction plate, r1 is the outer radius of the friction plate, and r2 is the inner radius of the friction plate.

[0062] The wear of the friction plate directly leads to a decrease in its mass m, which in turn causes its own moment of inertia I PThe wear amount of mass Δm and the change of moment of inertia ΔI decrease P There is a linear proportional relationship:

[0063] ;

[0064] Moment of inertia of friction plate The change will be reflected in the change of the angular acceleration α of the friction plate. Through calibration and continuous monitoring, the change of angular acceleration α can be accurately converted into the change of the moment of inertia of the friction plate. , the specific calculation process is as follows:

[0065] ;

[0066] is the moment of inertia of the measuring shaft 42 and the floating friction plate 1 obtained by the n+1th measurement, is the moment of inertia of the measuring shaft 42 and the floating friction plate 1 obtained by the n+2th measurement, is the difference in the moment of inertia of the floating friction plate 1 obtained from the two measurements.

[0067] According to the formula:

[0068] ;

[0069] To measure the resistance torque on the shaft 42, is the total moment of inertia of the measuring shaft 42 and the floating friction plate 1 during the nth measurement, α n The average angular acceleration of the measuring shaft 42 and the floating friction plate 1 is obtained for the nth measurement.

[0070] We can get:

[0071] ;

[0072] Finally, the mass wear Δm of the floating friction plate 1 between two wear cycles can be obtained:

[0073] ;

[0074] For further reference, Figure 2 、 Figure 3 and Figure 4 .

[0075] The drive system 2 includes a servo motor 21, a first elastic coupling 22 and a drive shaft 23 connected in sequence. The drive shaft 23 is connected to the measuring shaft 42 through the clutch 3. The data acquisition and processing system 6 includes a photoelectric encoder 61, a second elastic coupling 62, a synchronization shaft 63 connected in sequence, and an industrial computer (not shown) connected to the photoelectric encoder 61. The synchronization shaft 63 is coaxially connected to the measuring shaft 42.

[0076] The servo motor 21 provides stable and controllable torque, the photoelectric encoder 61 monitors the rotational speed and angular displacement of the measuring shaft 42 in real time, and the first elastic coupling 22 and the second elastic coupling 62 are used to absorb vibration and compensate for centering errors.

[0077] One end of the measuring shaft 42 forms a flange, and the flange is connected to the floating friction plate 1 and the synchronization shaft 63 by bolts.

[0078] Optionally, the drive system 2 further includes a torque sensor (not shown), which is connected to the drive shaft 23 and the clutch 3 .

[0079] Furthermore, in order to reduce the influence of the clutch 3 on the moment of inertia of the measuring shaft 42 as much as possible, a part of the clutch 3 is designed to be integrated with the measuring shaft 42. Figure 4 .

[0080] The clutch 3 includes a friction master disc 31, a friction male disc 32, a second bearing seat 33 and a cylinder 34, wherein the friction master disc 31 is a tapered hole formed at the end of the measuring shaft 42, and the friction male disc 32 is a tapered head formed at the end of the drive shaft 23. The inner wall of the tapered hole and the outer wall of the tapered head are preset with anti-slip grooves. The drive shaft 23 is connected to the actuator of the cylinder 34 through the second bearing seat 33. The cylinder 34 is fixedly connected to the test bench. The cylinder 34 is used to drive the second bearing seat 33 to move along the axial direction of the drive shaft 23 so that the friction master disc 31 and the friction male disc 32 are in contact or separation.

[0081] When the friction master plate 31 and the friction male plate 32 are in contact, the drive shaft 23 outputs torque to the measuring shaft 42 through the friction master plate 31 and the friction male plate 32. When the friction master plate 31 and the friction male plate 32 are separated, the measuring shaft 42 and the friction master plate 31 idle. This design can further reduce the overall rotational inertia of the measuring shaft 42 when it is idling, and reduce the influence of the weight of the measuring shaft 42 itself on the angular acceleration α of the floating friction plate 1.

[0082] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the embodiments of the present invention.

Claims

1. An online measurement method for the wear resistance of a floating friction plate, characterized in that: The following steps are involved: System calibration: Measure the drag torque of the measuring shaft (42) when it is idling ; Installation and wear: The floating friction plate (1) is installed on the measuring shaft (42), the servo motor (21) drives the measuring shaft (42) through the clutch (3) to accelerate to the speed n1, the loading device (5) applies a preset pressure to the floating friction plate (1) through the wear piece (51), and the friction and wear test of the specified period is started; Decoupling: at a preset measurement node, the loading device (5) is first unloaded, so that the counter-wearing member (51) is completely separated from the floating friction plate (1), and then the clutch (3) is disconnected; Acquisition: The data acquisition system records the resistance torque of the measuring shaft (42) The complete speed-time curve of free deceleration under the action of the brake, until it stops or reaches the preset cut-off speed n2; Calculation: According to the speed-time curve, calculate the average angular acceleration α of the measuring shaft (42) during this process n , and then calculate the mass wear Δm of the floating friction plate (1) between two measurements: ； in, is the resistance torque of the measuring shaft (42) when idling, α n The average angular acceleration of the measuring shaft (42) is obtained for the nth acquisition, r1 is the outer radius of the friction plate, and r2 is the inner radius of the friction plate.

2. The online measurement method for the anti-wear performance of a floating friction plate according to claim 1, characterized in that: The measuring shaft (42) measures the resistance torque when idling. The steps specifically include the following steps: Starting: Without installing the floating friction plate (1), the drive system (2) drives the measuring shaft (42) to accelerate to a speed n1 via the clutch (3); Decoupling: the clutch (3) is quickly disconnected, separating the drive system (2) from the measuring shaft (42); Acquisition: The data acquisition system records the resistance torque of the measuring shaft (42) The complete speed-time curve of free deceleration under the action of the brake, until it stops or reaches the preset cut-off speed n2; Calculation: Based on the speed-time curve, calculate the average angular acceleration α1 during this process, and then calculate the constant resistance torque on the measuring shaft (42) .

3. The online measurement method for the anti-wear performance of a floating friction plate according to claim 1, characterized in that: Also includes measuring the resistance torque of the measuring shaft (42) when it is idling Steps: A torque sensor is used to connect the drive system (2) and the measuring shaft (42). Without installing the floating friction plate (1), the drive system (2) drives the measuring shaft (42) to accelerate to a speed n1 through the clutch (3) and the torque sensor. At this time, the reading of the torque sensor is the constant resistance torque applied to the measuring shaft (42). .

4. An online measurement system for the wear resistance of a floating friction plate, characterized in that: The online measurement system is used to perform the online measurement method according to claim 1, and the online measurement system comprises a test bench and a drive system (2), a clutch (3), a rotating table (4), a loading device (5) and a data acquisition and processing system (6) installed thereon; The drive system (2) is used to drive the floating friction plate (1) to rotate, the clutch (3) connects the drive system (2) and the floating friction plate (1), the rotating table (4) is used to carry the floating friction plate (1) and constrain its rotation axis, the loading device (5) is used to drive the wear member (51) to apply positive pressure to the floating friction plate (1) to simulate friction wear under actual working conditions, and the data acquisition and processing system (6) is used to monitor the speed and angular displacement of the measuring shaft (42) in real time after the drive system (2) is decoupled from the floating friction plate (1) through the clutch (3), record the speed-time data of the deceleration process, and calculate the angular acceleration, moment of inertia and final wear amount according to the built-in algorithm.

5. The online measurement system for the anti-wear performance of a floating friction plate according to claim 4, characterized in that: The rotating table (4) comprises a first bearing seat (41) and a measuring shaft (42); the first bearing seat (41) is fixedly connected to the test table; the measuring shaft (42) and the first bearing seat (41) form a rotating pair; the measuring shaft (42) is used to install the floating friction plate (1).

6. The online measurement system for the anti-wear performance of a floating friction plate according to claim 5, characterized in that: The drive system (2) comprises a servo motor (21), a first elastic coupling (22), and a drive shaft (23) connected in sequence, and the drive shaft (23) is connected to the measuring shaft (42) via the clutch (3).

7. The online measurement system for the anti-wear performance of a floating friction plate according to claim 5, characterized in that: The data acquisition and processing system (6) includes a photoelectric encoder (61), a second elastic coupling (62), a synchronization shaft (63) connected in sequence, and an industrial computer connected to the photoelectric encoder (61), and the synchronization shaft (63) is coaxially connected to the measuring shaft (42).

8. The online measurement system for the anti-wear performance of a floating friction plate according to claim 7, characterized in that: One end of the measuring shaft (42) forms a flange, and the flange is connected to the floating friction plate (1) and the synchronization shaft (63) by bolts.

9. The online measurement system for the anti-wear performance of a floating friction plate according to claim 6, characterized in that: The clutch (3) includes a friction master disc (31), a friction male disc (32), a second bearing seat (33) and a cylinder (34), wherein the friction master disc (31) is a tapered hole formed at the end of the measuring shaft (42), the friction male disc (32) is a tapered head formed at the end of the driving shaft (23), the inner wall of the tapered hole and the outer wall of the tapered head are preset with anti-slip grooves, the driving shaft (23) is connected to the actuator of the cylinder (34) through the second bearing seat (33), the cylinder (34) is fixedly connected to the test bench, and the cylinder (34) is used to drive the second bearing seat (33) to move along the axial direction of the driving shaft (23) so that the friction master disc (31) and the friction male disc (32) are in contact with or separated from each other.

10. An online measurement system for the anti-wear performance of a floating friction plate according to any one of claims 4 to 9, characterized in that: The drive system (2) further comprises a torque sensor, which is connected to the drive system (2) and the clutch (3).

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