A synchronous drive apparatus and method for non-connected shafting measurement

Abstract

The application belongs to the field of aero-engine shaft system measurement, and particularly relates to a synchronous driving device and method for non-connected shaft system measurement, comprising a first shaft and a second shaft installed on a platform; the first shaft and the second shaft are respectively provided with a laser alignment instrument for measurement; the first shaft and the second shaft are respectively connected to a driving motor synchronous pulley of a driving motor through a synchronous pulley and a synchronous belt; the driving motors of the first shaft and the second shaft are simultaneously connected to a controller, the controller controls synchronous rotation of the driving motors of the first shaft and the second shaft; the laser alignment instrument is connected to the controller; the application can realize continuous scanning and multi-point measurement of the laser alignment instrument without connecting the first shaft and the second shaft.

Description

Technical Field

[0001] This application belongs to the field of aero-engine shaft system measurement, and specifically relates to a synchronous drive device and method for measuring non-connected shaft systems. Background Technology

[0002] Laser alignment instruments are modern measuring devices used for aligning shaft systems in rotating machinery. They typically employ 635–670 nm wavelength semiconductor red lasers, with measuring devices capable of sending and receiving laser beams mounted on the first and second axes, and connected to the main equipment via wired or wireless means.

[0003] A laser beam is emitted from the transmitter and received by the receiver. When the beam falls on the photoelectric array CCD of the receiver, a very small illumination area is formed. The main unit calculates and determines the energy center point of this illumination area with high precision. As the axis rotates, the energy center points of each beam also shift on the CCD acquisition surface of the other receiver. The laser alignment instrument then calculates the axial and angular deviations of the measured device based on these displacements.

[0004] According to the device feature descriptions published by major manufacturers, laser alignment instruments have different measurement modes, including continuous scanning and multi-point measurement. Continuous scanning mode collects data points densely, gathering hundreds or even thousands of data sets during a complete measurement cycle. Through data processing, the deviations of the first and second axes are obtained, resulting in accurate and highly repeatable results. While multi-point mode only requires collecting three data sets to calculate the measurement result, the calculation results have larger errors and lower repeatability.

[0005] According to the measurement principle of laser alignment instruments, regardless of the measurement mode, the first and second axes must rotate through the same angle when passing through each data acquisition point. Currently, continuous scanning measurement modes often require mechanical connection of the first and second axes to ensure synchronous rotation, followed by data acquisition by rotating the instrument. Multi-point measurement modes typically involve manual synchronous rotation of the two axes. During measurement, the operator must first rotate one axis and try to fix it before completing one data acquisition. Then, the other axis is rotated by the same angle, ensuring that this angle is consistent with the rotation angle of the first axis. Once the rotation angle is confirmed to be the same, a set of data is acquired. Subsequently, the same steps are followed to acquire other data until all data acquisition is completed.

[0006] The disadvantages of existing technology are:

[0007] 1) Obviously, before using the laser alignment instrument, the first and second shafts are misaligned. Forcibly connecting them to ensure synchronous rotation will generate assembly stress inside the shaft system. The deformation and changes in bearing clearance caused by the stress will affect the accuracy of the measurement results. If the initial misalignment is large, forcibly connecting them may even damage the coupling or the shaft system.

[0008] 2) If there is a spacer between the first and second axes, and the two axes are connected by the spacer, in addition to the above-mentioned problems, the stress and deformation caused by the weight of the spacer itself will also affect the accuracy of the measurement results.

[0009] 3) If manual synchronous rotation is used, there is no need to mechanically connect the first and second axes, thus avoiding the aforementioned problems. However, as described in the previous measurement method, this method relies too heavily on manual operation, which can easily introduce operational errors and lead to inaccurate measurement results.

[0010] 4) As mentioned earlier, manual synchronous rotation is not suitable for continuous scanning measurement modes that require collecting a large number of data points. In multi-point measurement mode, obtaining a relatively stable and accurate measurement result typically requires at least 8 to 12 data points. This means that the single-point measurement operation needs to be repeated multiple times, which, as described in the single-point measurement method, is extremely cumbersome. Furthermore, completing shaft alignment requires multiple adjustments and measurements, making the entire alignment process very inefficient. Summary of the Invention

[0011] To address the problem of not being able to use a laser alignment instrument for continuous scanning measurement in the non-connected state of the first and second axes; to eliminate the influence of assembly stress caused by the mechanical connection of the first and second axes in the initial misalignment state on measurement accuracy; to eliminate the influence of the gravity of the interval axis on measurement accuracy; to eliminate the influence of human operation error on measurement accuracy; and to solve the problem of low measurement efficiency in multi-point measurement mode, this application provides a synchronous drive device for non-connected shaft system measurement, comprising:

[0012] The first and second axes are installed on the platform;

[0013] The first and second axes are each equipped with a laser alignment instrument for measurement;

[0014] The first shaft is connected to the drive motor's synchronous pulley via a synchronous pulley and a synchronous belt; the second shaft is connected to the drive motor's synchronous pulley via a synchronous pulley and a synchronous belt.

[0015] The drive motors of the first axis and the second axis are simultaneously connected to the controller, which controls the drive motors of the first axis and the second axis to rotate synchronously; the laser alignment instrument is connected to the controller.

[0016] Preferably, the drive motor includes a servo motor or a stepper motor.

[0017] Preferably, the basic parameters input to the controller include: continuous rotation, step-by-step rotation, manual control, rotation step length, number of rotation steps, or rotation angle of each drive motor.

[0018] Preferably, the controller is connected to the laser alignment instrument via wired or wireless means. The controller outputs a start measurement command to the laser alignment instrument, receives measurement data from the laser alignment instrument, and outputs a stop measurement command to the laser alignment instrument.

[0019] Preferably, the drive motor is equipped with a synchronous belt tensioning mechanism, which is used to adjust the tension of the synchronous belt.

[0020] Preferably, both the first axis and the second axis are equipped with angular displacement sensors, and the angular displacement sensors are connected to the controller.

[0021] Preferably, the controller controls the drive motor of the first axis via electrical pulses, the angular displacement sensor of the first axis feeds back an angular displacement signal to the controller, and the controller controls the drive motor of the second axis to be configured such that the angular displacement signal fed back by the angular displacement sensor of the second axis is equal to the angular displacement signal fed back by the angular displacement sensor of the first axis.

[0022] A method for measuring non-connected shaft systems, employing the aforementioned synchronous drive device for measuring non-connected shaft systems.

[0023] The laser alignment instrument and the drive motors of the first and second axes are activated by the controller.

[0024] The controller controls the rotation of the drive motors of the first and second axes, and the controller also controls the frequency of data acquisition by the laser alignment instrument.

[0025] Based on the data collected by the laser alignment instrument, the controller calculates and displays the measurement results, and then stops the laser alignment instrument and the drive motors of the first and second axes.

[0026] Preferably, the controller controls the rotation of the drive motors of the first and second axes in the following ways: continuous rotation and periodic step-by-step rotation.

[0027] Preferably, when the drive motor rotates continuously, the controller controls the frequency of data acquisition by the laser alignment instrument based on the speed of the drive motor;

[0028] When the drive motor rotates in stages, the controller controls the data acquisition cycle of the laser alignment instrument and the acquisition frequency of one cycle based on the cycle of the drive motor's rotation.

[0029] The advantages of this application include:

[0030] 1) It can achieve continuous scanning and multi-point measurement of the laser alignment instrument without connecting the first and second axes.

[0031] 2) It can eliminate inaccurate measurement results caused by assembly stress.

[0032] 3) It can eliminate inaccurate measurement results caused by the gravity of the spacer axis.

[0033] 4) It can eliminate inaccurate measurement results caused by operational errors.

[0034] 5) It can improve the working efficiency of multi-point measurement mode.

[0035] 6) By connecting the device to a laser alignment instrument, automatic or semi-automatic measurement can be achieved, further improving measurement efficiency.

[0036] 7) By using an angular displacement sensor connected to the controller, the controller uses dual channels to control the two motors, which can improve the synchronization rate of the drive motors and improve the measurement accuracy;

[0037] 8) Based on the controller's control method for the drive motor, the laser alignment instrument is matched and its measurement settings are adjusted to eliminate system errors caused by the stepper motor and controller during the measurement process. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the installation of a synchronous drive device for measuring non-connected shaft systems;

[0039] Figure 2 This is a schematic diagram of the installation of a synchronous drive device and load equipment for non-connected shaft measurement. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0041] like Figures 1-2As shown, this application provides a synchronous drive device for non-connected shaft system measurement, comprising:

[0042] The first and second axes are installed on the platform;

[0043] The first and second axes are each equipped with a laser alignment instrument for measurement;

[0044] The first shaft and the second shaft are respectively connected to the drive motor synchronous pulley 3 of the drive motor via synchronous pulley 5 and synchronous belt 7. Synchronous pulley 5, synchronous belt 7 and drive motor synchronous pulley 3 adopt a standardized synchronous belt design. Synchronous belt 7 can be set with multiple length groups to adapt to different equipment. The interface between the equipment synchronous pulley 5 and the equipment can be designed with a universal connection structure, or it can be customized according to the actual shaft structure of the equipment so as to fix it on the equipment shaft during the alignment process.

[0045] The drive motors of the first axis and the second axis are simultaneously connected to the controller 11, and the controller 11 controls the drive motors of the first axis and the second axis to rotate synchronously; the laser alignment instrument is connected to the controller 11.

[0046] Furthermore, the drive motor includes a servo motor or a stepper motor.

[0047] Furthermore, the basic parameters input to the controller 11 include: continuous rotation, step-by-step rotation, manual control, rotation step length, number of rotation steps, or rotation angle of each drive motor.

[0048] Furthermore, the controller 11 connects to the laser alignment instrument via wired or wireless means, outputs a start measurement command to the laser alignment instrument, receives measurement data from the laser alignment instrument, and outputs a stop measurement command to the laser alignment instrument.

[0049] Furthermore, the drive motor is equipped with a synchronous belt tensioning mechanism, which is used to adjust the tension of the synchronous belt. The drive motor mounting bracket and the synchronous belt tensioning mechanism 9 can be customized according to the actual structure of the equipment, or a universal structure can be used to fix it on the base or non-rotating parts of the equipment. The tensioning mechanism ensures a stable connection between the synchronous belt and the pulley.

[0050] Furthermore, both the first axis and the second axis are equipped with angular displacement sensors, and the angular displacement sensors are both connected to the controller 11.

[0051] Furthermore, the controller 11 controls the drive motor of the first axis via electrical pulses, the angular displacement sensor of the first axis feeds back an angular displacement signal to the controller 11, and the controller 11 controls the drive motor of the second axis to be configured such that the angular displacement signal fed back by the angular displacement sensor of the second axis is equal to the angular displacement signal fed back by the angular displacement sensor of the first axis.

[0052] A method for measuring non-connected shaft systems, employing the aforementioned synchronous drive device for measuring non-connected shaft systems.

[0053] 1) Install the timing pulley 5 of the equipment onto the first and second shafts of the equipment.

[0054] 2) Fix the drive motor mounting bracket and the synchronous belt tensioning mechanism 9 in the predetermined position.

[0055] 3) Install the drive motor 1 and the drive motor timing pulley 3 mounted on it onto the fixed frame and the timing belt tensioning mechanism 9.

[0056] 4) Install the timing belt 7, and use the drive motor mounting bracket and timing belt tensioning mechanism 9 to adjust the timing belt tension.

[0057] 5) Connect the controller 11 to the power supply 12 and turn it on, and set the drive parameters on the controller 11.

[0058] 6) Install a laser alignment instrument.

[0059] 7) Begin measurement and adjustment. In semi-automatic mode, the operator manually operates the laser alignment instrument to collect data after the device completes single-step drive. In fully automatic mode, the device communicates and links with the laser alignment instrument, automatically rotates and collects data throughout the process.

[0060] The steps for the fully automatic mode are as follows:

[0061] The laser alignment instrument and the drive motors of the first and second axes are started by the controller 11;

[0062] The controller 11 controls the rotation of the drive motors of the first and second axes, and the controller 11 controls the frequency of data acquisition by the laser alignment instrument.

[0063] Based on the data collected by the laser alignment instrument, the controller 11 calculates and displays the measurement results, and stops the laser alignment instrument and the drive motors of the first and second axes.

[0064] The controller 11 controls the rotation of the drive motors of the first and second axes in the following ways: continuous rotation and periodic step-by-step rotation.

[0065] When the drive motor rotates continuously, the controller 11 controls the frequency of data acquisition by the laser alignment instrument based on the speed of the drive motor.

[0066] When the drive motor rotates in stages, the controller 11 controls the data acquisition cycle of the laser alignment instrument and the acquisition frequency of one cycle based on the cycle of the drive motor's stage rotation.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for measuring a non-connected shaft system, comprising a synchronous drive device for measuring a non-connected shaft system, characterized in that, The synchronous drive device for measuring the non-connected shaft system includes: a first shaft and a second shaft mounted on the platform; The first and second axes are each equipped with a laser alignment instrument for measurement; The first shaft is connected to the drive motor synchronous pulley via a synchronous pulley and a synchronous belt; the second shaft is connected to the drive motor synchronous pulley via a synchronous pulley and a synchronous belt. The drive motors of the first and second axes are simultaneously connected to a controller, which controls the drive motors of the first and second axes to rotate synchronously. The laser alignment instrument is connected to the controller. The controller controls the drive motor of the first axis through electrical pulses. The angular displacement sensor of the first axis feeds back an angular displacement signal to the controller. The controller controls the drive motor of the second axis to be configured such that the angular displacement signal fed back by the angular displacement sensor of the second axis is equal to the angular displacement signal fed back by the angular displacement sensor of the first axis. The measurement method includes: The measurement process of the laser alignment instrument and the drive motors of the first and second axes are started by the controller; The controller controls the rotation of the drive motors of the first and second axes, and the controller also controls the frequency of data acquisition by the laser alignment instrument. Based on the data collected by the laser alignment instrument, the controller displays the measurement results and stops the laser alignment instrument and the drive motors of the first and second axes.

2. The non-connected shaft system measurement method as described in claim 1, characterized in that, The drive motor includes a servo motor or a stepper motor.

3. The non-connected shaft system measurement method as described in claim 1, characterized in that, The basic parameters input to the controller include: continuous rotation, step-by-step rotation, manual control, rotation step length, number of rotation steps, or rotation angle of each drive motor.

4. The non-connected shaft system measurement method as described in claim 1, characterized in that, The controller connects to the laser alignment instrument via wired or wireless means. The controller outputs a start measurement command to the laser alignment instrument, receives measurement data from the laser alignment instrument, and outputs a stop measurement command to the laser alignment instrument.

5. The non-connected shaft system measurement method as described in claim 1, characterized in that, The drive motor is equipped with a synchronous belt tensioning mechanism, which is used to adjust the tension of the synchronous belt.

6. The non-connected shaft system measurement method as described in claim 1, characterized in that, Both the first axis and the second axis are equipped with angular displacement sensors, and the angular displacement sensors are connected to the controller.

7. The non-connected shaft system measurement method as described in claim 1, characterized in that, The controller controls the rotation of the drive motors of the first and second axes in the following ways: continuous rotation and periodic step-by-step rotation.

8. The non-connected shaft system measurement method as described in claim 7, characterized in that, When the drive motor rotates continuously, the controller controls the frequency of data acquisition by the laser alignment instrument based on the speed of the drive motor; When the drive motor rotates in stages, the controller controls the data acquisition cycle of the laser alignment instrument and the acquisition frequency of one cycle based on the cycle of the drive motor's rotation.

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