Torsional vibration test platform for elastic coupling

Abstract

The torsional vibration test platform comprises a power input shaft and a resistance input shaft which can be connected to the two ends of the elastic coupling respectively; the power input shaft is driven by a motor; the resistance input shaft is limited by a brake; the power input shaft is sleeved with a fixing disc, and a distance sensor is installed on the fixing disc. The resistance input shaft is sleeved with a detection disc. The surface, facing the distance sensor, of the detection disc is provided with a circular ring. According to the torsional vibration test platform for the elastic coupling, displacement between the fixing disc and the circular ring is monitored in real time through the distance sensor, then the angular displacement difference is obtained, and compared with a traditional mode that angular displacement is monitored through a Hall sensor, the monitoring mode has higher precision. Furthermore, the offset working condition can be simulated through the adjustable platform, and quantitative eccentric load is provided through the load mechanism, so that the multi-working-condition test of the elastic coupling is realized.

Description

Technical Field

[0001] The invention relates to a torsional vibration test platform for an elastic coupling, belonging to the technical field of torsional vibration testing. Background Art

[0002] The elastic coupling is assembled from two claw-shaped sleeves and an elastomer. Due to its large axial, radial and angular compensation capabilities, the elastic coupling is often used to connect the main shaft of the diesel engine and the generator in electric motors and diesel generator sets. However, when transmitting torque, due to the imbalance of the two connected shafts, the deformation of the elastic body, the system's moment of inertia, installation errors, and torque fluctuations, torsional vibrations are easily generated at both ends of the elastic coupling. Torsional vibration is extremely destructive. In mild cases, it changes the torsional stress acting on the shaft, increases fatigue damage to the shaft, and reduces its service life. Severe torsional vibrations can cause damage or breakage of the unit's shaft system, affecting the safe and reliable operation of the unit. In addition, torsional vibrations can also affect the power generation quality of the diesel generator set, making the power generation voltage unstable and reducing the electrical quality.

[0003] Currently, there are coupling test platforms, such as Patent 201420506649.6, which discloses a coupling test device. The coupling test is performed using the device. The two ends of the coupling are respectively installed between the input flange and the output flange. The two coupled shafts cannot be offset relative to each other, and the actual working state of the coupling cannot be effectively simulated. For example, Patent 201110230470.3 discloses a coupling test platform, in which the linkage mechanism swings at a certain angle to simulate the operating condition of the coupling. However, the test machine can only simulate the angular offset of the axes of the two coupled shafts in the horizontal plane, and cannot simulate other offset conditions.

[0004] The coupling test bench currently used in the market uses Hall angular displacement sensors, which have low accuracy when detecting the angular displacement difference of the shaft sleeves at both ends of the coupling and cannot meet the test requirements. Furthermore, the existing coupling test bench can only simulate a single working condition, and cannot simulate working conditions such as unbalanced load of the coupling specimen and misalignment of the two coupled shafts. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to overcome the disadvantages of the above-mentioned technology and to provide a torsional vibration test platform of an elastic coupling with high precision.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is: a torsional vibration test platform for an elastic coupling, comprising: a power input shaft and a resistance input shaft that can be respectively connected to the two ends of the elastic coupling; the power input shaft is driven by a motor; the resistance input shaft is limited by a brake; a fixed disk is sleeved on the power input shaft, and a distance sensor is installed on the fixed disk; a detection disk is sleeved on the resistance input shaft; a circular ring is provided on the surface of the detection disk facing the distance sensor, and the distance sensor can measure the distance between the detection disk and a certain point on the circular ring; as the angular deviation between the power input shaft and the resistance input shaft changes, the point detected by the distance sensor moves along the circular ring; The circular ring has ups and downs, and a certain point on the circular ring is taken as 0 degrees. Then, in the intervals of 0 to 60 degrees, 120 to 160 degrees, 200 to 240 degrees, and 300 to 360 degrees, the ups and downs of the circular ring can satisfy that when the angle deviation between the power input shaft and the resistance input shaft changes at a uniform speed, the distance change measured by the distance sensor is also at a uniform speed; In the range of 60 degrees, 120 degrees, and 240 to 300 degrees, the fluctuation of the ring can satisfy that when the angle deviation between the power input shaft and the resistance input shaft changes at a constant speed, the distance change measured by the distance sensor is uniform acceleration; In the range of 160 degrees to 200 degrees, the fluctuation of the circular ring can satisfy the requirement that when the angular deviation between the power input shaft and the resistance input shaft changes at a constant speed, the distance measured by the distance sensor does not change.

[0007] A further improvement of the above scheme is that: the brake is supported by an adjustable platform; the adjustable platform can adjust the pitch, position and rotation angle of the brake.

[0008] A further improvement of the above scheme is that: the resistance input shaft is equipped with a load mechanism; the load mechanism can generate a rotational load and an eccentricity.

[0009] A further improvement of the above scheme is that: the load mechanism includes a first fixed block and a second fixed block mounted on the resistance input shaft; a load block is connected between the first fixed block and the second fixed block via a connecting rod; and the relative position of the first fixed block and the load block is adjustable.

[0010] A further improvement of the above scheme is that: the motor drives the power input shaft through a clutch; and a torque sensor is also installed on the power input shaft.

[0011] The torsional vibration test platform for the elastic coupling provided by the present invention monitors the displacement between the fixed disk and the ring in real time through a distance sensor, thereby obtaining the angular displacement difference. Compared with the traditional monitoring of angular displacement using a Hall sensor, this monitoring method has higher accuracy. Furthermore, the adjustable platform can simulate the offset working condition, and the load mechanism provides a quantitative eccentric load, thereby realizing multi-condition testing of the elastic coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure of the first fixed block in FIG.

[0014] Figure 3 yes Figure 1 Schematic diagram of the structure of the detection disk.

[0015] Figure 4 It is a trajectory diagram of the detection point of the distance sensor moving along a circle in a preferred embodiment of the present invention. Implementation

[0016] Embodiment: The torsional vibration test platform for elastic coupling of this embodiment is as follows: Figure 1 As shown, it includes: a power input shaft 5 and a resistance input shaft 6; the motor 3 is connected to the power input shaft 5 through a magnetic powder clutch 4 and a coupling 14 and drives the power input shaft 5 to rotate; a torque sensor 9 is also installed on the power input shaft 5, and at the same time, the power input shaft 5 is supported by a bearing seat 18.

[0017] The resistance input shaft 6 is limited by the electromagnetic brake 10 ; the power input shaft 5 and the resistance input shaft 6 are respectively connected to the two ends of the elastic coupling 7 to be tested; and a torque difference is generated through the action of the motor 3 and the electromagnetic brake 10 .

[0018] A fixed disk 11 is sleeved on the power input shaft 5, and a laser distance sensor 13 is installed on the fixed disk 11; a detection disk 12 is sleeved on the resistance input shaft 6. The laser distance sensor 13 and the detection disk 12 are opposite. The edge of the detection disk 12 protrudes toward the sensor 13 to form an undulating ring, and the detection point of the laser distance sensor 13 falls on the ring.

[0019] The resistance input shaft 6 is equipped with a load mechanism; the load mechanism can generate rotational load and eccentricity. The load mechanism consists of a first fixed block 801, a second fixed block 802 and two load blocks 803. The first fixed block 801 and the second fixed block 802 are installed on the resistance output shaft through expansion sleeves. The first fixed block 801 and the second fixed block 802 are connected to the load block 803 through a connecting rod, and the connecting rod forms a quadrilateral. Figure 2 As shown, the first fixed block 801 includes a main body 801a, a screw rod 801c and a movable block 801b; the first fixed block 801 is hollow for accommodating an expansion sleeve 804; the movable block 801b is installed on the side of the main body 801a through the screw rod 801c, and the surface of the movable block 801b has a threaded hole for connecting a connecting rod; in this way, the movable block 801b can be driven to move along the axial direction of the resistance input shaft 6 through the screw rod 801c, thereby adjusting the shape of the quadrilateral formed by the connecting rod, that is, changing the length of the rotation axis of the load block 803; thereby achieving the adjustment of the eccentricity and the moment of inertia. In order to meet a wider range of adjustments, the load block 803 can use a variety of different weights, which can be selected according to the test requirements.

[0020] The calculation formula of the moment of inertia of the load mechanism is: ; Where: - the linear distance between the distal end of a load block and the axis of the resistance input shaft, - The linear distance between the proximal end face of a load block and the axis of the resistance input shaft, - the linear distance between the distal end of the other load block and the axis of the resistance input shaft, -The straight-line distance between the proximal end of the other load block and the axis of the resistance input shaft, M-the mass of the load block (the weights of the two load blocks are the same).

[0021] Detection plate 12 as Figure 3 As shown, a certain point on the circular ring is taken as 0 degrees, then in the intervals of 0 to 60 degrees, 120 to 160 degrees, 200 to 240 degrees, and 300 to 360 degrees, the fluctuation of the circular ring can satisfy that when the angle deviation between the power input shaft 5 and the resistance input shaft 6 changes at a uniform speed, the distance change measured by the laser distance sensor 13 is also at a uniform speed, and these four intervals are defined as constant speed intervals.

[0022] In the intervals of 60 degrees, 120 degrees, and 240 to 300 degrees, the fluctuation of the ring can satisfy that when the angle deviation between the power input shaft 5 and the resistance input shaft 6 changes at a uniform speed, the distance change measured by the laser distance sensor 13 is constant acceleration, and these two intervals are defined as constant acceleration intervals.

[0023] In the interval from 160 degrees to 200 degrees, the fluctuation of the ring can satisfy that when the angle deviation between the power input shaft 5 and the resistance input shaft 6 changes at a constant speed, the distance measured by the laser distance sensor 13 does not change, and this interval is defined as a static interval.

[0024] like Figure 4As shown, the curve of the ring on the detection disk 12 is unfolded, with a total of 7 intervals, among which the distance measured by the laser distance sensor 13 and the angle on the ring in the constant speed interval are in a first-power relationship; the constant acceleration interval is in a second-power relationship, and the static interval is a constant.

[0025] In order to ensure the accuracy of measurement, two laser distance sensors are arranged on the fixed plate 11, and the connecting line of the two laser distance sensors is symmetrically arranged through the axis of the power input shaft 5. In this way, in the equal acceleration range, the distance changes measured by the two sensors are consistent in value and in opposite directions.

[0026] At the beginning of the test, the initial state is that one of the laser distance sensors is aligned with an equal acceleration interval, and this position is set as the reference zero point. The angle difference between the fixed disk 11 and the detection disk 12 is also the angle difference between the power input shaft 5 and the resistance input shaft 6, that is, the angle difference at both ends of the elastic coupling 7.

[0027] In the constant acceleration range, the angle difference between the fixed disk 11 and the detection disk 12 can be expressed by the formula Calculate, where: is the angle difference between the fixed plate 11 and the detection plate 12; and h is the distance difference measured by the laser displacement sensor. Thus, the angle difference between the two ends of the elastic coupling 7 can be obtained from the distance measured by the laser distance sensor.

[0028] Therefore, the angle difference test of torsional vibration is performed, and the angle difference between the fixed plate 11 and the detection plate 12 is calculated as follows: , where: is the angle difference between the fixed disk 11 and the detection disk 12; is the angle difference between the fixed disk 11 and the detection disk 12; is the angle difference between the fixed disk 11 and the detection disk 12 in the initial state; is the angle difference between the angular position fixing plate 11 and the detection plate 12 of the coupling after torsional vibration; correspondingly, h1 and h2 are the distance differences measured by the laser displacement sensor before and after torsional vibration.

[0029] In order to further optimize the measurement accuracy, the angle difference calculated by the two laser displacement sensors is averaged: , where: Represents the average angle difference obtained by the two sensors; is the angle difference obtained by one of the laser displacement sensors; It is the angle difference obtained by another laser displacement sensor.

[0030] The above-mentioned test platform is supported by the support platform 1. The brake 10 is supported by an adjustable platform; the adjustable platform includes a base 15 driven by a linear guide rail, which can adjust the position of the brake 10 in the horizontal plane, and also includes a rotating seat 16 driven by a worm gear, the rotating seat 16 is located on the base 17, and can adjust the rotation angle of the brake 10 in the horizontal plane; and also includes a pitch platform 17, the pitch platform 17 is located on the rotating seat 16, and can adjust the pitch angle of the brake 10. The base 15 is installed on the support platform 1, so that the entire test platform forms a whole; it is convenient to adjust its levelness, etc.

[0031] By adjusting the position, rotation and pitch of the adjustable platform, comprehensive performance testing, simulation and evaluation of the elastic coupling under a variety of different offset conditions can be achieved.

[0032] The present invention is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. A torsional vibration test platform for elastic coupling, characterized in that: include: A power input shaft and a resistance input shaft that can be connected to both ends of the elastic coupling respectively; the power input shaft is driven by a motor; the resistance input shaft is limited by a brake; a fixed disk is sleeved on the power input shaft, and a distance sensor is installed on the fixed disk; a detection disk is sleeved on the resistance input shaft; a circular ring is provided on the surface of the detection disk facing the distance sensor, and the distance sensor can measure the distance between the detection disk and a certain point on the circular ring; as the angular deviation between the power input shaft and the resistance input shaft changes, the point detected by the distance sensor moves along the circular ring; The circular ring has ups and downs, and a certain point on the circular ring is taken as 0 degrees. Then, in the intervals of 0 to 60 degrees, 120 to 160 degrees, 200 to 240 degrees, and 300 to 360 degrees, the ups and downs of the circular ring can satisfy that when the angle deviation between the power input shaft and the resistance input shaft changes at a uniform speed, the distance change measured by the distance sensor is also at a uniform speed; In the range of 60 degrees, 120 degrees, and 240 to 300 degrees, the fluctuation of the ring can satisfy that when the angle deviation between the power input shaft and the resistance input shaft changes at a constant speed, the distance change measured by the distance sensor is uniform acceleration; In the range of 160 degrees to 200 degrees, the fluctuation of the circular ring can satisfy the requirement that when the angular deviation between the power input shaft and the resistance input shaft changes at a constant speed, the distance measured by the distance sensor does not change.

2. The torsional vibration test platform for elastic coupling according to claim 1, characterized in that: The brake is supported by an adjustable platform; the adjustable platform can adjust the pitch, position and rotation angle of the brake.

3. The torsional vibration test platform for elastic coupling according to claim 1, characterized in that: The resistance input shaft is equipped with a load mechanism; the load mechanism can generate a rotational load and an eccentricity.

4. The torsional vibration test platform for elastic coupling according to claim 3, characterized in that: The load mechanism comprises a first fixed block and a second fixed block sleeved on the resistance input shaft; a load block is connected between the first fixed block and the second fixed block via a connecting rod; and the relative position of the first fixed block and the load block is adjustable.

5. The torsional vibration test platform for elastic coupling according to claim 1, characterized in that: The motor drives the power input shaft through a clutch; a torque sensor is also installed on the power input shaft.

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