A torsional vibration test platform for a flexible coupling

Abstract

The present application relates to a kind of torsional vibration test platform for elastic coupling, comprising: the power input shaft and resistance input shaft capable of being connected respectively at the both ends of elastic coupling;The power input shaft is driven by motor;The resistance input shaft is limited by brake;Fixed disc is sleeved on the power input shaft, and distance sensor is installed on the fixed disc;Detection disc is sleeved on the resistance input shaft;The surface of the detection disc towards distance sensor has circular ring.The torsional vibration test platform for elastic coupling provided by the present application, the displacement between fixed disc and circular ring is monitored in real time by distance sensor, and then the angular displacement difference is obtained, compared with the traditional use of Hall sensor to monitor angular displacement, this monitoring mode has higher precision.Further, by adjustable platform, offset working condition can be simulated, and quantitative eccentric load is provided by load mechanism, so as to realize the multi-working condition test of elastic coupling.

Description

Technical Field

[0001] This invention relates to a torsional vibration testing platform for flexible couplings, belonging to the field of torsional vibration testing technology. Background Technology

[0002] Flexible couplings are assembled from two claw-shaped bushings and an elastic body. Due to their large axial, radial, and angular compensation capabilities, flexible couplings are often used in electric motors and diesel generator sets to connect the main shafts of the diesel engine and generator. However, when transmitting torque, torsional vibration can easily occur at both ends of the flexible coupling due to imbalances between the two shafts, deformation of the elastic body, system rotational inertia, installation errors, and torque fluctuations. Torsional vibration is extremely destructive. At best, it changes the torsional stress acting on the shaft, increasing shaft fatigue damage and reducing service life. Severe torsional vibration can lead to damage or breakage of the generator set's shaft system, affecting the safe and reliable operation of the unit. Furthermore, torsional vibration can also affect the power generation quality of the diesel generator set, causing unstable voltage and degrading electrical quality.

[0003] Currently, coupling testing platforms exist. For example, patent 201420506649.6 discloses a coupling testing device. Using this device to test couplings, the two ends of the coupling are respectively installed between the input flange and the output flange, preventing relative offset between the two connected shafts and failing to effectively simulate the actual working state of the coupling. Another example is patent 201110230470.3, which discloses a coupling testing platform where a linkage mechanism swings at a certain angle to simulate the coupling's operating conditions. However, this testing machine can only simulate angular offset of the two connected shaft axes in the horizontal plane and cannot simulate other offset conditions.

[0004] Currently, coupling test benches on the market use Hall effect angular displacement sensors, which have low accuracy in detecting the angular displacement difference between the two bushings at the two ends of the coupling and cannot meet the test requirements. Furthermore, existing coupling test benches can only simulate relatively simple working conditions and cannot simulate working conditions such as unbalanced loads on the coupling sample and misalignment between the two connected shafts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technologies and provide a high-precision torsional vibration testing platform for flexible couplings.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is: a torsional vibration testing platform for flexible couplings, comprising: a power input shaft and a resistance input shaft that can be respectively connected to both ends of the flexible 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 mounted on the fixed disk; a detection disk is sleeved on the resistance input shaft; the detection disk has a ring on its surface facing the distance sensor, and the distance sensor can measure the distance between itself and a point on the 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 ring;

[0007] The ring has undulations. Taking a certain point on the ring as 0 degrees, the undulations of the ring can satisfy the condition 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 also changes at a constant speed.

[0008] Within the range of 60 degrees to 120 degrees and 240 to 300 degrees, the undulation of the ring can satisfy the condition that when the angular 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 at a constant acceleration.

[0009] Within the range of 160 to 200 degrees, the undulation of the ring can ensure that the distance measured by the distance sensor remains unchanged when the angular deviation between the power input shaft and the resistance input shaft changes at a constant speed.

[0010] A further improvement to 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.

[0011] A further improvement to the above scheme is that the resistance input shaft is equipped with a load mechanism; the load mechanism is capable of generating rotational load and eccentricity.

[0012] A further improvement to the above solution is that the load mechanism includes 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 first fixed block via a connecting rod; the relative position of the first fixed block and the load block is adjustable.

[0013] A further improvement to the above solution is that the motor drives the power input shaft via a clutch; and a torque sensor is also installed on the power input shaft.

[0014] The torsional vibration testing platform for flexible couplings provided by this invention monitors the displacement between the fixed disc and the ring in real time using a distance sensor, thereby obtaining the angular displacement difference. Compared with the traditional method of using Hall sensors to monitor angular displacement, this monitoring method has higher accuracy. Furthermore, the adjustable platform can simulate offset conditions, and a quantitative eccentric load can be provided through a load mechanism, thereby realizing multi-condition testing of the flexible coupling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure of the first fixed block.

[0017] Figure 3 yes Figure 1 A schematic diagram of the detection disk in the image.

[0018] Figure 4 This is a preferred embodiment of the invention showing the trajectory of the detection point of the distance sensor moving along a circular ring. Implementation

[0019] Example: The torsional vibration testing platform for flexible couplings in this example, such as... Figure 1 As shown, it includes: a power input shaft 5 and a resistance input shaft 6; a 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 the power input shaft 5 is supported by a bearing housing 18.

[0020] 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; the torque difference is generated by the action of the motor 3 and the electromagnetic brake 10.

[0021] A fixed disk 11 is fitted onto the power input shaft 5, and a laser distance sensor 13 is mounted on the fixed disk 11; a detection disk 12 is fitted onto the resistance input shaft 6. The laser distance sensor 13 and the detection disk 12 are opposite each other. The edge of the detection disk 12 protrudes towards the sensor 13, forming an undulating ring, and the detection point of the laser distance sensor 13 falls on the ring.

[0022] 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 mounted on the resistance output shaft via expansion sleeves. The load blocks 803 are connected to the first fixed block 801 and the second fixed block 802 via connecting rods, the connecting rods forming a quadrilateral shape. Figure 2 As shown, the first fixed block 801 includes a main body 801a, a lead screw 801c, and a movable block 801b. The first fixed block 801 is hollow and is used to accommodate the expansion sleeve 804. The movable block 801b is mounted on the side of the main body 801a via the lead screw 801c, and the surface of the movable block 801b has a threaded hole for connecting the connecting rod. In this way, the lead screw 801c can drive the movable block 801b to move axially along the resistance input shaft 6, thereby adjusting the shape of the quadrilateral formed by the connecting rod, that is, changing the rotation axis length of the load block 803; thus realizing the adjustment of eccentricity and moment of inertia. To meet a wider range of adjustments, the load block 803 can use various different weights, which can be selected according to the test requirements.

[0023] The formula for calculating the moment of inertia of the load mechanism is:

[0024] In the formula: - The straight-line distance between the far end face of a load block and the axis of the resistance input shaft. - The straight-line distance between the near end face of a load block and the axis of the resistance input shaft. - The straight-line distance between the far end face of the other load block and the axis of the resistance input shaft. - The straight-line distance between the near end face of the other load block and the axis of the resistance input shaft, M - the mass of the load block (both load blocks have the same weight).

[0025] Detection disc 12 Figure 3 As shown, a point on the ring is taken as 0 degrees. In the intervals of 0 degrees to 60 degrees, 120 degrees to 160 degrees, 200 degrees to 240 degrees, and 300 degrees to 360 degrees, the undulation of the ring can satisfy the condition that when the angular deviation between the power input shaft 5 and the resistance input shaft 6 changes at a constant speed, the distance change measured by the laser distance sensor 13 is also at a constant speed. These four intervals are defined as constant speed intervals.

[0026] In the ranges of 60 degrees to 120 degrees and 240 to 300 degrees, the undulation of the ring can satisfy the condition that when the angular deviation between the power input shaft 5 and the resistance input shaft 6 changes at a constant speed, the distance change measured by the laser distance sensor 13 is at constant acceleration. These two ranges are defined as the constant acceleration ranges.

[0027] Within the range of 160 to 200 degrees, the undulation of the ring can satisfy the condition that when the angular 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. This range is defined as the stationary range.

[0028] like Figure 4As shown, the curve of the ring on the detection disk 12 is divided into 7 intervals. In the constant speed interval, the distance measured by the laser distance sensor 13 and the angle on the ring have a first power relationship; in the constant acceleration interval, the relationship is a second power relationship; and in the stationary interval, the relationship is a constant.

[0029] To ensure measurement accuracy, two laser distance sensors are installed on the fixed disk 11, with the connecting line between them symmetrically positioned along the axis of the power input shaft 5. This ensures that, within the constant acceleration range, the changes in distance measured by the two sensors are numerically identical, but in opposite directions.

[0030] At the start of the test, the initial state is that one of the laser distance sensors is aligned with a constant acceleration zone, and this position is set as the reference zero point. The angle difference between the fixed plate 11 and the detection plate 12 is also the angle difference between the power input shaft 5 and the resistance input shaft 6, which is also the angle difference between the two ends of the flexible coupling 7.

[0031] During 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: h is the angle difference between the fixed disk 11 and the detection disk 12; h is the distance difference measured by the laser displacement sensor. In this way, the angle difference between the two ends of the flexible coupling 7 can be obtained from the distance measured by the laser distance sensor.

[0032] Therefore, the angle difference between the fixed plate 11 and the detection plate 12 is calculated as follows for torsional vibration angle difference testing: In the formula: It is the angle difference between the fixed plate 11 and the detection plate 12; It is the angle difference between the fixed plate 11 and the detection plate 12; The angle difference between the fixed disk 11 and the detection disk 12 in the initial state; The angle difference between the angular positioning 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.

[0033] To further optimize measurement accuracy, the method involves averaging the angle differences calculated by the two laser displacement sensors: In the formula: This represents the average angle difference obtained from the two sensors; It is the angle difference obtained from one of the laser displacement sensors; It is the angle difference obtained from another laser displacement sensor.

[0034] The aforementioned test platform is supported by 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, capable of adjusting the position of the brake 10 in the horizontal plane; it also includes a rotating seat 16 driven by a worm gear, located on base 17, capable of adjusting the rotation angle of the brake 10 in the horizontal plane; and a pitch platform 17 located on the rotating seat 16, capable of adjusting the pitch angle of the brake 10. Base 15 is mounted on support platform 1, making the entire test platform a single unit; this facilitates adjustments to its levelness, etc.

[0035] By adjusting the position, rotation, and pitch of the adjustable platform, comprehensive performance testing, simulation, and evaluation of flexible couplings can be achieved under various offset conditions.

[0036] This invention is not limited to the embodiments described above. All technical solutions formed by equivalent substitutions fall within the scope of protection claimed by this invention.

Claims

1. A torsional vibration testing platform for a resilient coupling, characterized by, The utility model relates to a kind of elastic coupling angle deviation detection device, including: Power input shaft and resistance input shaft can be connected respectively at both ends of elastic coupling;The power input shaft is driven by motor;The resistance input shaft is limited by brake;Fixed disc is sleeved on the power input shaft, and distance sensor is installed on the fixed disc;Detection disc is sleeved on the resistance input shaft;The face of the detection disc towards distance sensor has annular, and the distance sensor can measure the distance of certain point on the annular;With the angle deviation change between the power input shaft and resistance input shaft, the point detected by the distance sensor moves along the annular; The annular has ups and downs, with certain point on the annular as 0 degree, then 0 degree to 60 degree, 120 degree to 160 degree, 200 degree to 240 degree, 300 degree to 360 degree interval, the ups and downs of the annular can meet when the angle deviation change between the power input shaft and resistance input shaft is uniform speed, then the distance change measured by the distance sensor is also uniform speed; 60 degree 120 degree, 240 to 300 degree interval, the ups and downs of the annular can meet when the angle deviation change between the power input shaft and resistance input shaft is uniform speed, then the distance change measured by the distance sensor is equal acceleration; 160 degree to 200 degree interval, the ups and downs of the annular can meet when the angle deviation change between the power input shaft and resistance input shaft is uniform speed, and the distance measured by the distance sensor does not change.

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

3. The torsional vibration testing platform for elastomeric couplings of claim 1, wherein: Resistance input shaft is equipped with load mechanism;The load mechanism can generate rotation load and eccentricity.

4. The torsional vibration testing platform for elastomeric couplings of claim 3, wherein: The load mechanism includes first fixed block and second fixed block sleeved on the resistance input shaft;First fixed block and the first fixed block are connected with load block through connecting rod;The relative position of the first fixed block and the load block is adjustable.

5. The torsional vibration testing platform for elastomeric couplings of claim 1, wherein: The motor drives the power input shaft through clutch;The power input shaft is also equipped with torsion sensor.

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