A reed type coupling test bench

Abstract

The present application relates to a kind of reed coupling test test bench, including driving end mechanism, driven end mechanism and installation mesa;The driving end mechanism includes servo motor, speed reducer, driving end brake and driving shaft, one end of the driving shaft is connected with the speed reducer, the other end of the driving shaft is connected with one end of reed coupling;The driven end mechanism includes driven shaft and driven end brake, one end of the driven shaft is connected with the driven end brake, the other end of the driven shaft is connected with the other end of reed coupling;The driving shaft and the driven shaft are also respectively provided with driving end encoder and driven end encoder, the driving end encoder and the driven end encoder can measure the rotational speed signal of driving shaft and the driven shaft respectively, the real-time torsion angle signal of reed coupling can be obtained by the peak value of the difference between two end encoders.

Description

Technical Field

[0001] This invention relates to the field of coupling testing technology, specifically to a test bench for testing the torsional dynamic stiffness and shaft torsional modes of reed couplings. Background Technology

[0002] Torsional vibration is quite common in the drivetrain systems of tracked vehicles. For example, during vehicle braking or starting, the sudden opening or closing of the throttle and the rapid engagement of the system clutch can generate torsional vibration responses. Torsional vibration responses may cause wear on the components between the drivetrain shafts, generate unpleasant noise, and may also cause vertical and longitudinal vibrations of the vehicle body.

[0003] Reed sensors exhibit dynamic stiffness and dynamic damping, where stiffness and damping change with rotational speed. They are widely used in the shafting of large diesel engines in military tracked vehicles and ships due to their high power density, adjustable stiffness and damping, and good vibration reduction performance. However, the following problems still exist in the use of reed sensors:

[0004] 1. Existing torsion angle testing methods cannot accurately measure and extract data on the torsion angle when torsion occurs on both sides of a shaft segment. Most methods can only measure the rotational speed information of a certain node.

[0005] 2. Most current testing platforms can only measure the static stiffness of couplings, and cannot effectively and accurately measure the dynamic stiffness of couplings.

[0006] 3. Existing testing platforms rarely involve testing the torsional vibration modes of shaft systems, and mostly focus on the modal measurement of bending vibration modes of shaft systems.

[0007] Therefore, it is necessary to provide a test bench for testing the torsional dynamic stiffness of reed couplings and the torsional modal characteristics of shaft systems to solve the above-mentioned technical problems. Summary of the Invention

[0008] The purpose of this invention is to provide a test bench for reed couplings for testing the torsional dynamic stiffness and shaft torsional modes of reed couplings.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A test bench for reed couplings includes a driving end mechanism, a driven end mechanism, and a mounting platform;

[0011] The active end mechanism includes a servo motor, a reducer, an active end brake, and a drive shaft. The servo motor and the drive shaft are fixedly mounted to the mounting platform via a motor base and a rotating bearing seat, respectively. The servo motor is driven by the reducer. One end of the drive shaft is connected to the reducer via an active end rigid coupling, and the other end of the drive shaft is connected to one end of a reed coupling. The active end brake is connected to the drive shaft and can brake the drive shaft.

[0012] The driven end mechanism includes a driven shaft and a driven end brake. The driven shaft is fixedly installed on the mounting platform through a rotating bearing seat, and the driven shaft is coaxial with the driving shaft. One end of the driven shaft is connected to the driven end brake through a driven end rigid coupling, and the other end of the driven shaft is connected to the other end of a reed coupling.

[0013] The drive shaft and the driven shaft are also respectively equipped with a drive end encoder and a driven end encoder, which can respectively measure the rotational speed signals of the drive shaft and the driven shaft.

[0014] In one embodiment, the reed coupling test bench performs the following procedure to obtain the real-time torsion angle of the reed coupling:

[0015] The servo motor drives the rotation of the entire shaft system. When the shaft system rotates stably, the active end brake brakes the active shaft, and at the same time, the driven end brake applies a reverse torque to the driven shaft. The difference between the active end encoder and the driven end encoder shows an instantaneous peak value. This peak value is the instantaneous torsion angle.

[0016] In one embodiment, the torsional dynamic stiffness of the reed coupling is obtained through the following process on the reed coupling test bench:

[0017] While the active end brake is braking the active shaft, the transient torque signal of the servo motor at this moment is read. The instantaneous torque is divided by the instantaneous torsional angle difference to obtain the dynamic stiffness of the reed coupling.

[0018] In one embodiment, the active brake is an electromagnetic brake, and the driven brake is a magnetic powder brake.

[0019] In one embodiment, at least one measuring gear is fixedly mounted on the driving shaft and the driven shaft respectively, and a torsional modal measuring striking rod is fixedly mounted on the side of the measuring gear.

[0020] In one embodiment, the reed coupling test bench further includes three acceleration sensors and a data acquisition system. The three acceleration sensors are fixed to the circumferential tangent of the measuring gear plate, and the three acceleration sensors are signal-connected to the data acquisition system.

[0021] In one embodiment, the reed coupling test bench obtains the peak frequency of the shaft torsional mode of the drive shaft through the following process:

[0022] When measuring the mode of the fixed boundary condition at the end of the drive shaft, the servo motor is turned off and the drive shaft is fixed by braking with the drive shaft brake. The data acquisition system collects the peak data of the three acceleration sensors on the drive shaft by striking one side of the torsional mode measuring striking bar on the measuring gear plate of the drive shaft with a force hammer. The peak data is the peak frequency of the shaft system torsional mode of the drive shaft.

[0023] In one embodiment, the reed coupling test bench obtains the peak frequency of the shaft system torsional mode of the driven shaft through the following process:

[0024] When measuring the mode of the driven shaft end with fixed boundary conditions, the servo motor is turned off and the driven end brake is used to fix the driven shaft. The torsional mode measuring striking bar on the measuring gear plate of the driven shaft is struck by a force hammer, and the data acquisition system collects the peak data of the three acceleration sensors on the driven end. The peak data is the peak frequency of the shaft system torsional mode of the driven shaft.

[0025] In one embodiment, the reed coupling test bench obtains the peak frequencies of the shaft torsional modes of the driving and driven shafts through the following process:

[0026] When measuring the modes of the fixed boundary conditions at the ends of the drive shaft and driven shaft, the servo motor is turned off, and both the drive end brake and the driven end brake are engaged to fix the drive shaft and driven shaft. The torsional mode measuring striking bar on the measuring gear plate of the drive shaft and driven shaft is struck by a force hammer. The peak data of the three acceleration sensors corresponding to the drive shaft and driven shaft collected by the data acquisition system are the peak frequencies of the shaft system torsional modes of the drive shaft and driven shaft.

[0027] In one embodiment, a striking rod mounting hole is provided on the side wall of the measuring gear disk, and the torsional modal measuring striking rod is fixed to the side of the measuring gear disk by mounting bolts and the striking rod mounting hole.

[0028] The beneficial effects of the reed coupling test bench provided by this invention are:

[0029] 1. This test bench for reed couplings has a driving end encoder and a driven end encoder at both ends of the reed coupling. The two encoders can measure the speed signals at both ends of the reed coupling. By calculating the peak value of the difference between the driving end encoder and the driven end encoder, the real-time torsion angle signal of the reed coupling can be obtained, which solves the technical problem that the existing platform cannot accurately measure the shaft torsion angle signal.

[0030] 2. By obtaining the precise torsion angle signal of the reed coupling node, the real-time change of the torsion angle amplitude can be obtained. Then, by reading the torque signal of the drive end based on the torque sensor built into the servo motor, the dynamic stiffness of the coupling can be obtained through the real-time torque amplitude and the node torsion angle amplitude, thus solving the technical problem that the existing platform cannot accurately measure the dynamic stiffness of the coupling.

[0031] 3. By striking one side of the torsional mode measuring rod with a force hammer, and through the data acquisition system and three acceleration sensors, the torsional mode frequency of the shaft system can be obtained, thus obtaining the test results of the shaft system torsional vibration mode, which solves the technical problem that the existing platform cannot measure the torsional vibration mode. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a preferred embodiment of the test bench for testing the torsional dynamic stiffness of a reed coupling and the torsional modal characteristics of a shaft system provided by the present invention.

[0033] Figure 2 This is a front view of the test bench of the present invention.

[0034] Figure 3 This is a partial view of the present invention in the torsional dynamic stiffness test.

[0035] Figure 4 This is a partial view of the shaft system modal testing according to the present invention.

[0036] The following are the labeling elements in the diagram: 1. Servo motor; 2. Motor base; 3. Reducer; 4. Rigid coupling at the driving end; 5. Electromagnetic brake; 6. Drive shaft; 7. Rotary bearing housing; 8. Driving end measuring gear disc; 9. Driving end encoder; 10. Reed coupling; 1001. Coupling mounting flange; 11. Driven end encoder; 12. Driven end measuring gear disc; 1201. Striking rod mounting hole; 1202. Mounting bolt; 1203. Torsional modal measuring striking rod; 1204. Gear disc body; 1205. Gear disc teeth; 13. Driven shaft; 14. Rigid coupling at the driven end; 15. Magnetic powder brake; 1501. Brake mounting base; 16. Mounting platform. Detailed Implementation

[0037] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0038] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0039] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0040] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0041] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0042] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0043] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] like Figures 1-4 As shown, this embodiment provides a test bench for reed couplings to test the torsional dynamic stiffness and shaft torsional modes of reed couplings. The test bench includes a driving end mechanism and a driven end mechanism connected to the reed coupling 10, both of which are fixedly mounted on the mounting surface 16.

[0046] The active end mechanism includes a servo motor 1, a reducer 3, an active end rigid coupling 4, an active end brake 5, and a drive shaft 6. The servo motor 1 is fixedly mounted on the mounting platform 16 via a motor base 2. The servo motor 1 is driven by the reducer 3. The drive shaft 6 is fixedly mounted on the mounting platform 16 via a rotating bearing seat 7. One end of the drive shaft 6 is connected to the reducer 3 via the active end rigid coupling 4, and the other end of the drive shaft 6 is connected to one end of a reed coupling 10 via a coupling mounting flange 1001. This allows the servo motor 1 to drive the drive shaft 6 to rotate at a set speed, thereby driving the reed coupling 10 to rotate. An active end brake 5 is also provided on the drive shaft 6 to brake it. In this embodiment, the active end brake 5 is an electromagnetic brake.

[0047] The driven end mechanism includes a driven shaft 13, a driven end rigid coupling 14, and a driven end brake 15. The driven shaft 13 is also fixedly mounted on the mounting platform 16 via a rotating bearing seat 7, and is coaxially arranged with the drive shaft 6. One end of the driven shaft 13 is connected to the driven end brake 15 via the driven end rigid coupling 14, and the other end of the driven shaft 13 is connected to the other end of a reed coupling 10, so that the rotation of the drive shaft 6 can be transmitted to the driven shaft 13 through the reed coupling 10, allowing the driven shaft 13 to rotate synchronously with the drive shaft 6. In this embodiment, the driven end brake 15 is a magnetic powder brake.

[0048] The reed coupling 10 has a driving encoder 9 and a driven encoder 11 installed at both ends corresponding to the driving shaft 6 and driven shaft 13, respectively. These two encoders can measure the rotational speed signals at both ends of the reed coupling 10. The driving encoder 9 and driven encoder 11 are connected to the corresponding driving shaft 6 and driven shaft 13 to measure their respective rotational speeds. The driving encoder 9 and driven encoder 11 can be incremental or absolute encoders. Incremental encoders convert displacement into periodic electrical signals, then convert these signals into counting pulses, using the number of pulses to represent the magnitude of the displacement. Absolute encoders assign a unique digital code to each position; therefore, their reading depends only on the starting and ending positions of the measurement, and is independent of the intermediate measurement process. In this embodiment, the active encoder 9 and the driven encoder 11 are encoders of the same specification. The shafts of the active encoder 9 and the driven encoder 11 are fixed to the corresponding active shaft 6 and driven shaft 13 by screws or keys, so as to measure the rotational speed signals of the active shaft 6 and the driven shaft 13 respectively.

[0049] The encoder of the reed coupling 10 obtains the real-time torsion angle signal of the reed coupling 10 by "subtracting the signals from both ends," which solves the technical problem that existing platforms cannot accurately measure the shaft torsion angle signal. Simultaneously, by obtaining the precise torsion angle signal of the reed coupling 10 nodes, the real-time change in the torsion angle amplitude can be obtained. Furthermore, based on the torque sensor integrated into the servo motor 1, the torque signal at the drive end can be read. Through the real-time torque amplitude and the node torsion angle amplitude, the dynamic stiffness of the coupling can be obtained, thus solving the technical problem that existing platforms cannot accurately measure the dynamic stiffness of couplings.

[0050] Specifically, when measuring the dynamic stiffness of the coupling, the servo motor 1 drives the rotation of the entire shaft system through the reducer 3 and the active end rigid coupling 4. First, it rotates in the forward direction. When the shaft system rotates stably, the active end brake at the servo motor end suddenly starts to brake. At the same time, the driven end brake 15 also applies a reverse torque to the driven shaft 13, causing the difference between the two encoders to have an instantaneous peak value. This peak value is the instantaneous torsion angle. By using the transient signal of the torque read by the servo motor 1 at this moment, the instantaneous torque is divided by the instantaneous torsion angle difference to obtain the dynamic stiffness of the reed coupling 10.

[0051] The reed coupling 10 is further equipped with a driving end measuring gear 8 and a driven end measuring gear 12 at both ends corresponding to the driving shaft 6 and driven shaft 13, respectively. The number and size of the driving end measuring gear 8 and driven end measuring gear 12 can be changed according to actual needs. See also Figure 1 and Figure 2In this embodiment, the drive shaft 6 is equipped with two drive-end measuring gears 8, and the driven shaft 13 is equipped with three driven-end measuring gears 12. The outer diameter of the gear in the middle position of the three driven-end measuring gears 12 is larger than the outer diameter of the other two gears. Since the drive-end measuring gears 8 and the driven-end measuring gears 12 are the same, this embodiment uses the driven-end measuring gear 12 as an example for explanation. See also Figure 4 The driven end measuring gear 12 includes a circular gear body 1204. Multiple gear teeth 1205 are arranged on the circumferential edge of the gear body 1204. The center of the gear body 1204 is fixedly connected to the driven shaft 13, allowing the gear body 1204 to rotate with the driven shaft 13. A striking rod mounting hole 1201 is provided on the side wall of the gear body 1204. A torsional modal measuring striking rod 1203 is fixed to the side of the gear body 1204 by mounting bolts 1202 and the striking rod mounting hole 1201. The driving end measuring gear 8 is also fixedly mounted with a torsional modal measuring striking rod in the same manner. By striking one side of the torsional modal measuring striking rod 1203 with a force hammer, and obtaining the torsional modal frequency of the shaft system through a data acquisition system (such as a Siemens data acquisition system recorder) and three acceleration sensors, the test results of the shaft system torsional vibration mode can be obtained, which solves the technical problem that the existing platform cannot measure the torsional vibration mode.

[0052] Specifically, when measuring the torsional mode of the shaft system, servo motor 1 is turned off. When it is necessary to measure the mode with fixed boundary conditions at the end of the drive shaft 6, simply energize the electromagnetic brake. At this time, the end of the drive shaft 6 is fixed. Arrange the three-phase accelerometer in the tangential direction of the gear plate, and use a hammer to strike one side of the torsional mode measuring striking bar on the drive end measuring gear plate 8 to obtain the mode of the shaft system with fixed boundary conditions at the end of the drive shaft 6. Similarly, when it is necessary to measure the mode with fixed boundary conditions at the end of the driven shaft 13, simply energize the magnetic powder brake to fix the end of the driven shaft 13. When it is necessary to measure the modes with fixed boundary conditions at the ends of both the drive shaft 6 and the driven shaft 13 simultaneously, simply energize both the electromagnetic brake and the magnetic powder brake to fix the ends of both the driven shaft 13 and the drive shaft 6. The modal measurement methods for the above three working conditions are consistent. They all use three-phase accelerometers, in conjunction with a hammer and a data acquisition system to acquire signals and obtain the peak frequency of the mode.

[0053] The three-axis accelerometer mentioned here refers to a sensor that senses motion in three directions in space. It can detect the acceleration of an object in the X, Y, and Z directions, thereby determining the object's motion state. A three-axis accelerometer typically consists of three single-axis accelerometers. Each single-axis accelerometer basically consists of four main parts: a vibration system, a mass, a sensitive element, and an integrated electronic chip. The vibration system and the mass work together to detect acceleration, the sensitive element converts mechanical vibration into an electrical signal, and the integrated electronic chip converts the electrical signal into a digital signal. The working principle of the three-axis accelerometer is that the three single-axis accelerometers cooperate to detect the object's motion state. When an object accelerates in the X direction, the X-axis single-axis sensor is affected by the acceleration and outputs a corresponding electrical signal. The measurements in the other two directions are similar. By combining the acceleration signals in the three directions, the object's motion state can be determined. The data acquisition system collects the output electrical signals of the three-axis accelerometer to read the peak frequency of the torsional mode of the shaft system, thus obtaining the test results of the shaft system's torsional vibration mode.

[0054] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A reed coupling test bench, characterized in that, The device comprises a driving end mechanism, a driven end mechanism and a mounting platform; The driving end mechanism comprises a servo motor, a speed reducer, a driving end brake and a driving shaft, the servo motor and the driving shaft are fixedly installed to the mounting platform through a motor base and a rotating bearing base respectively, the servo motor is drivingly connected with the speed reducer, one end of the driving shaft is connected with the speed reducer through a driving end rigid coupling, the other end of the driving shaft is connected with one end of a reed coupling, the driving end brake is connected with the driving shaft and can brake the driving shaft; The driven end mechanism comprises a driven shaft and a driven end brake, the driven shaft is fixedly installed to the mounting platform through a rotating bearing base, and the driven shaft is coaxially arranged with the driving shaft, one end of the driven shaft is connected with the driven end brake through a driven end rigid coupling, the other end of the driven shaft is connected with the other end of the reed coupling; The driving shaft and the driven shaft are further respectively provided with a driving end encoder and a driven end encoder, the driving end encoder and the driven end encoder can respectively measure the rotating speed signals of the driving shaft and the driven shaft.

2. The reed coupling test bench of claim 1, wherein, The reed coupling test bench executes the following process to obtain the real-time torsion angle of the reed coupling: The servo motor drives the rotation of the whole shafting, when the rotation of the shafting is stable, the driving end brake brakes the driving shaft, at the same time, the driven end brake also applies a reverse torque to the driven shaft, the difference between the driving end encoder and the driven end encoder appears a transient peak value, and the peak value of the difference is the transient torsion angle.

3. The reed coupling test bench of claim 2, wherein, The reed coupling test bench obtains the torsion dynamic stiffness of the reed coupling through the following process: The transient torque signal of the servo motor at this moment is read while the driving end brake brakes the driving shaft, and the dynamic stiffness of the reed coupling is obtained by dividing the transient torque by the transient torsion angle difference.

4. The reed coupling test bench of claim 1, wherein, The driving end brake is an electromagnetic brake, and the driven end brake is a magnetic powder brake.

5. The reed coupling test bench of claim 1, wherein, The driving shaft and the driven shaft are respectively fixedly installed with at least one measuring gear, and the side surface of the measuring gear is fixedly installed with a torsion modal measurement knocking rod.

6. The reed coupling test bench of claim 5, wherein, The reed coupling test bench further comprises three acceleration sensors and a data acquisition system, the three acceleration sensors are fixed to the circumferential section of the measuring gear, and the three acceleration sensors are signal connected with the data acquisition system.

7. The reed coupling test bench of claim 6, wherein, The reed coupling test bench obtains the shafting torsion modal peak frequency of the driving shaft through the following process: When the modal of the fixed boundary condition at the end of the driving shaft is measured, the servo motor is closed, the driving end brake brakes to fix the driving shaft, one side of the torsion modal measurement knocking rod on the measuring gear of the driving shaft is knocked by a force hammer, and the peak value data of the three acceleration sensors on the driving end are collected by the data acquisition system, and the peak value data is the shafting torsion modal peak frequency of the driving shaft.

8. The reed coupling test bench of claim 6, wherein, The reed coupling test bench obtains the shafting torsion modal peak frequency of the driven shaft through the following process: When measuring the modal of the fixed boundary condition of the driven shaft end, the servo motor is closed, and the driven end brake brakes to fix the driven shaft, the side of the knock rod is measured by the force hammer knocking the torsional modal of the measurement tooth disc of the driven shaft, and the peak data of the three acceleration sensors on the driven end are collected by the data acquisition system, and the peak frequency of the shaft system torsional modal of the driven shaft is obtained.

9. The reed coupling test bench of claim 6, wherein, The spring plate type coupling test bench obtains the peak frequency of the shaft system torsional modal of the driving shaft and the driven shaft through the following process: When measuring the modal of the fixed boundary condition of the driving shaft and the driven shaft end, the servo motor is closed, and the driving end brake and the driven end brake are braked to fix the driving shaft and the driven shaft, the side of the knock rod is measured by the force hammer knocking the torsional modal of the measurement tooth disc of the driving shaft and the driven shaft, and the peak data of the three acceleration sensors corresponding to the driving shaft and the driven shaft are collected by the data acquisition system, and the peak frequency of the shaft system torsional modal of the driving shaft and the driven shaft is obtained.

10. The reed coupling test bench of claim 5, wherein, The disc body side wall of the measurement tooth disc is provided with a knock rod mounting hole, and the torsional modal measurement knock rod is fixed to the side of the measurement tooth disc through the mounting bolt and the knock rod mounting hole.

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