A press main shaft deflection test rack device and a measuring method thereof

Abstract

The application relates to a press machine main shaft deflection test rack setting device and a measuring method thereof, and relates to the technical field of press machine equipment detection. The deflection test rack setting device comprises a positioning setting component, a rotating speed acquisition component, a displacement acquisition component, an upper control component and a switching power supply component. The device is quickly fixed through a magnetic seat support, and an orthogonal positioning jig ensures accurate orthogonal arrangement of a laser displacement meter, thereby solving the problems of no special setting structure and low positioning accuracy in the existing test, and the device is convenient to disassemble and assemble and is suitable for stamping machine site working conditions. Through the mode of collecting orthogonal displacement signals from the side of the main shaft, the problems of limited installation space and signal interference in the conventional axial direction detection are avoided, the actual operation state of the main shaft is closer, and the authenticity of the deflection measurement is improved.

Description

Technical Field

[0001] This application relates to the field of press equipment testing technology, and in particular to a press spindle runout testing setup device and its measurement method. Background Technology

[0002] The flywheel of a press is a key energy storage component in stamping equipment. It balances energy output by storing and releasing kinetic energy, ensuring a stable and efficient stamping process. During press operation, the motor continuously drives the flywheel to rotate, storing energy during off-peak hours. When stamping occurs, the flywheel rapidly releases energy, assisting the motor in overcoming short-term peak loads, thus achieving a high-force stamping action. This design not only reduces the power requirements of the motor but also effectively smooths speed fluctuations, improving the stability of equipment operation. The core functions of the flywheel include: Energy regulation and buffering: Energy is stored during the idle stroke and released at the moment of impact, making the power output more uniform; Stable rotational speed: Utilizing its large moment of inertia reduces spindle speed fluctuations and ensures stamping accuracy; Reduce motor load: Avoid configuring excessively powerful motors to cope with peak loads, thereby improving energy efficiency and economy; Assistance in overcoming dead points: Helps mechanical systems smoothly overcome resistance points during operation and maintain continuous operation.

[0003] The flywheel spindle (i.e., the press spindle) is the core component for transmitting kinetic energy. Its runout during operation directly affects the stability of flywheel energy storage and the stamping accuracy. It is a key indicator for measuring the operating status of the press. Accurate detection of the spindle runout is of great significance for the research and development, debugging, factory testing, operation and maintenance of the press.

[0004] A real-time detection device and method for a high-speed rotating spindle have been disclosed. The device includes a measuring target point on the axial end face of the spindle, a laser emitter, an image data acquisition unit, a signal converter, a data storage device, and a spatial three-dimensional coordinate system display system. The detection method involves the image data acquisition unit receiving laser light reflected from the measuring target point on the axial end face of the spindle in real time. The image data acquisition unit then uses the signal converter to determine the three-dimensional coordinates of the received laser interference fringes in the three-dimensional coordinate system. The three-dimensional coordinates are then used for model calculations to obtain the average value. Vibration analysis and fault diagnosis are performed based on the numerical values. This invention solves the synchronization problem of various sensor detection data in the prior art, enabling real-time and synchronous detection of the spindle's radial vibration, axial displacement, real-time rotational speed, and the specific values ​​of the rotational direction.

[0005] The existing technical solutions described above have the following drawbacks: 1. Existing press spindle runout testing lacks a dedicated setup device, and most tests use general-purpose parts to temporarily construct the test structure, resulting in low positioning accuracy, poor on-site adaptability, and cumbersome setup. 2. Conventional testing methods often obtain the motion trajectory from the flywheel axis to deduce the spindle state. However, the installation space is limited and the signal is easily interfered with. It is impossible to achieve synchronous and accurate acquisition of the displacement signals in the radial and perpendicular directions of the spindle, resulting in low accuracy of runout measurement. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this application provides a runout testing setup and measurement method for a press spindle. The device achieves rapid fixation via a magnetic support bracket, and an orthogonal positioning fixture ensures precise orthogonal placement of the laser displacement gauge. This solves the problems of existing testing methods lacking dedicated setup structures and having low positioning accuracy. The device is easy to assemble and disassemble, and adaptable to the on-site working conditions of the press. By acquiring orthogonal displacement signals from the side of the spindle, it avoids the limitations of installation space and signal interference issues associated with conventional axial direction detection, more closely reflecting the actual operating state of the spindle and improving the accuracy of runout measurements.

[0007] This was achieved using the following technical solutions: In a first aspect, this application provides a test setup for testing the runout of a press spindle, comprising: The positioning and mounting assembly is mounted on the press body and is used for orthogonally positioning the radial direction of the press spindle; The positioning and mounting components include a magnetic base bracket and a right-angle orthogonal positioning fixture; The magnetic base bracket is disassembled and then magnetically attached to the press body; A right-angle orthogonal positioning fixture is set on a magnetic base bracket, including two mounting positions, and the included angle between the center lines of the mounting positions is 90 degrees, which is used to install the displacement acquisition component.

[0008] The speed acquisition components are respectively installed on the rotating end face of the press spindle and the positioning bracket assembly, and are used to monitor the operating status of the press spindle and acquire the spindle speed signal; The rotational speed acquisition component includes a tachometer, highly reflective stickers, and shielded cables; High-reflective stickers are affixed to the rotating end face of the press spindle. The tachometer is fixed to the magnetic base bracket and located in front of the press spindle, aligned with the highly reflective sticker, to detect the light signal reflected by the highly reflective sticker and convert it into a spindle speed signal; The displacement acquisition component, mounted on the positioning frame, is used to detect the radial running trajectory of the press spindle and acquire radial displacement signals. The displacement acquisition component includes two sets of displacement gauges and a signal acquisition card; The displacement gauge, fixed to the mounting position of the right-angle orthogonal positioning fixture, is used to detect the radial position change of the press spindle and convert it into a radial displacement signal; The signal acquisition card, connected to the displacement gauge, includes several signal channels for receiving and transmitting radial displacement signals to the upper control component. Shielded cable, used to transmit spindle speed signal to upper control component; The upper-level control component is connected to the speed acquisition component and the displacement acquisition component respectively. It is used to configure the operating mode and filtering parameters of the signal channel, and to receive and analyze the spindle speed signal and radial displacement signal, and to draw the spindle runout trajectory diagram of the press. A power supply adapter is connected to the above-mentioned components and is used to supply power and transfer signals to the above-mentioned components. The power supply adapter assembly includes a bit adapter plate and a shielded connector; The adapter board is connected to the displacement gauge and the signal acquisition card respectively to achieve stable transfer of displacement signals; The shielded connector, in conjunction with the shielded cable, is used to suppress electromagnetic interference on site, while also supplying power to the displacement gauge and tachometer.

[0009] By adopting the above technical solution, using magnetic support for adsorption positioning and orthogonal layout of displacement gauges and photoelectric tachometers, non-contact high-precision synchronous acquisition of spindle radial displacement and speed signals is achieved. After analysis and trajectory drawing by upper-level components, the comprehensiveness, accuracy and safety of press operation status monitoring are significantly improved.

[0010] This application further specifies that the host control component includes a signal acquisition module, a control module, and an interactive display module; The signal acquisition module is connected to the signal acquisition card and the shielded cable, respectively, and is used to receive the spindle speed signal and the radial displacement signal and transmit them to the control module. The control module is used to configure the working mode of the signal acquisition card, the operating mode and signal filtering parameters of the signal channel, receive and process the spindle speed signal and radial displacement signal, calculate the spindle runout, and transmit it to the interactive display module. The interactive display module is used to establish a coordinate system based on the radial axis and, in conjunction with the spindle runout, generate a spindle runout trajectory diagram of the press.

[0011] By adopting the above technical solution, the signal acquisition module synchronously receives speed and displacement signals, the control module dynamically configures channel parameters and calculates spindle runout, and the interactive display module generates runout trajectory diagram in real time based on radial coordinate system, realizing integrated monitoring and precise visualization of the press spindle operating status, significantly improving monitoring efficiency and diagnostic intuitiveness.

[0012] This application further specifies that the control module includes: The parameter configuration unit is used to set the working mode of the signal acquisition card to AC coupling mode, and to configure the operating mode of the signal channel to pulse signal acquisition mode and voltage signal acquisition mode respectively, and to determine the signal filtering parameters. The signal processing unit is used to filter the radial displacement signal according to the signal filtering parameters and the spindle speed signal, and convert the radial displacement signal according to the preset sensitivity to obtain the actual radial displacement. The drawing and display unit is used to perform fusion calculations on the actual radial displacement based on the radial type to obtain the spindle runout, and then, in conjunction with the radial fusion coordinate system, generate a spindle runout trajectory diagram of the press.

[0013] The radial fusion coordinate system is as follows: the X-axis displacement is used as the horizontal coordinate, and the Y-axis displacement is used as the vertical coordinate.

[0014] By adopting the above technical solution, configuring AC coupling and pulse acquisition mode, combining filtering and sensitivity conversion to obtain the actual radial displacement, and fusing to generate the spindle runout trajectory diagram in the XY coordinate system, high-precision and visual monitoring of the press spindle's operating status is achieved, significantly improving diagnostic intuitiveness and configuration flexibility.

[0015] Secondly, this application also provides a measurement method for a yaw test setup device, employing the following technical solution: A measurement method for a yaw test setup device includes: The magnetic base bracket is erected and fixed to the press body, and is located within the safe distance range of the press spindle. Two sets of displacement gauges are installed on the mounting position of the right-angle orthogonal positioning fixture. The measuring distance of the displacement gauge is adjusted to the midpoint of its measuring range, so that the measuring optical axis of the displacement gauge is aligned with the spindle radially from the press spindle, and the two measuring optical axes are kept at 90° orthogonal. Adhere a highly reflective sticker to the rotating end face of the press spindle, align the tachometer with the reflective sticker, and fix the tachometer bracket on the magnetic base bracket. Turn on the power to all components and rotate the press spindle one revolution to confirm that the displacement gauge, tachometer and press spindle are not in contact or interfere with each other, and that all components are securely connected and that there are no abnormalities in signal transmission. Open the parameter configuration unit of the host computer, set the working mode of the signal acquisition card to AC coupling mode, configure the operating mode of the first and second signal channels of the signal acquisition card to voltage signal acquisition mode, and configure the sensitivity of the third signal channel to pulse signal acquisition mode according to the displacement meter model, and determine the signal filtering parameters. The press is started, and the spindle reaches the stable speed to be detected. The displacement gauges in the X and Y directions and the tachometer in the Y direction are activated to simultaneously collect the dynamic displacement signals and speed signals of the press spindle in the X and Y directions. All signals are then transmitted to the signal processing unit via the signal acquisition module. The signal processing unit converts the dynamic displacement signals in the X and Y directions into actual radial displacements according to a preset sensitivity, and combines them with the rotational speed signal to filter the signals according to the signal filtering parameters to obtain real-time displacement data in the X and Y directions, and calculates the spindle runout. Using the X-axis displacement as the abscissa and the Y-axis displacement as the ordinate, a radial fusion coordinate system is constructed, and plotted according to the spindle runout to generate the spindle runout trajectory diagram of the press. The spindle runout test is then completed.

[0016] By adopting the above technical solution, the orthogonal displacement meter and photoelectric tachometer are non-contactly installed on the radial direction of the press spindle using a magnetic bracket. AC coupling and pulse acquisition mode are configured to synchronously acquire X and Y displacement and speed signals. After sensitivity conversion and filtering, the actual radial displacement is obtained, and the spindle runout trajectory diagram is generated based on the radial fusion coordinate system. This achieves high-precision, real-time, and visual monitoring of the press's operating status, significantly improving testing efficiency and diagnostic intuitiveness.

[0017] In summary, the beneficial technical effects of this application are as follows: By using magnetic support for adsorption positioning and orthogonal arrangement of displacement gauges and photoelectric tachometers, non-contact high-precision synchronous acquisition of spindle radial displacement and speed signals is achieved. After analysis and trajectory drawing by upper-level components, the comprehensiveness, accuracy and safety of press operation status monitoring are significantly improved. By synchronously receiving speed and displacement signals through the signal acquisition module, the control module dynamically configures channel parameters and calculates the spindle runout, and the interactive display module generates a runout trajectory diagram in real time based on the radial coordinate system, the integrated monitoring and precise visualization of the press spindle's operating status are realized, significantly improving monitoring efficiency and diagnostic intuitiveness. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the yaw test setup device in this application; Figure 2 This is a physical schematic diagram of the positioning and mounting components in this application; Figure 3 This is a schematic diagram of the control module in this application; Figure 4 This is a flowchart illustrating the measurement method based on the yaw test setup device in this application; Figure 5 This is an example data graph of the spindle yaw rate in this application; Figure 6This is a diagram of the spindle runout trajectory of the press in this application. Detailed Implementation

[0019] The present application will be further described in detail below with reference to the accompanying drawings.

[0020] Reference Figures 1-2 This application discloses a test setup for testing the runout of a press spindle, comprising: The positioning and mounting assembly is mounted on the press body and is used for orthogonally positioning the radial direction of the press spindle; The positioning and mounting components include a magnetic base bracket and a right-angle orthogonal positioning fixture; The magnetic base bracket is disassembled and then magnetically attached to the press body; A right-angle orthogonal positioning fixture is set on a magnetic base bracket, including two mounting positions, and the included angle between the center lines of the mounting positions is 90 degrees, which is used to install the displacement acquisition component.

[0021] The speed acquisition components are respectively installed on the rotating end face of the press spindle and the positioning bracket assembly, and are used to monitor the operating status of the press spindle and acquire the spindle speed signal; The rotational speed acquisition component includes a tachometer, highly reflective stickers, and shielded cables; High-reflective stickers are affixed to the rotating end face of the press spindle. The tachometer is fixed to the magnetic base bracket and located in front of the press spindle, aligned with the highly reflective sticker, to detect the light signal reflected by the highly reflective sticker and convert it into a spindle speed signal; Shielded cable, used to transmit spindle speed signal to upper control component; The displacement acquisition component, mounted on the positioning frame, is used to detect the radial running trajectory of the press spindle and acquire radial displacement signals. It includes two sets of displacement gauges and a signal acquisition card. The displacement gauge, fixed to the mounting position of the right-angle orthogonal positioning fixture, is used to detect the radial position change of the press spindle and convert it into a radial displacement signal; The signal acquisition card, connected to the displacement gauge, includes several signal channels for receiving and transmitting radial displacement signals to the upper control component. The upper-level control component is connected to the speed acquisition component and the displacement acquisition component respectively. It is used to configure the operating mode and filtering parameters of the signal channel, and to receive and analyze the spindle speed signal and radial displacement signal, and to draw the spindle runout trajectory diagram of the press. A power supply adapter assembly, connected to the above-mentioned components, is used to supply power and signal transfer to the above-mentioned components, including a bit adapter board and a shielded connector; The adapter board is connected to the displacement gauge and the signal acquisition card respectively to achieve stable transfer of displacement signals; The shielded connector, in conjunction with the shielded cable, is used to suppress electromagnetic interference on site, while also supplying power to the displacement gauge and tachometer.

[0022] In this embodiment, the positioning and mounting assembly is the core of the device, including a magnetic base bracket and a 90° orthogonal positioning fixture. The magnetic base bracket can be adsorbed and fixed onto the press body, enabling rapid positioning and fixation of the device. The 90° orthogonal positioning fixture is mounted on the magnetic base bracket, and the fixture has two displacement gauge mounting positions, with the center line connecting the two mounting positions forming a 90° angle. This is used to mount the laser displacement gauge, ensuring that the measuring optical axis of the displacement gauge is aligned with the main shaft from the side (radial) of the main shaft, guaranteeing that the measuring optical axis of the laser displacement gauge is strictly orthogonal, and accurately acquiring the displacement signals of the press main shaft (flywheel main shaft) in the radial X and Y directions, which are perpendicular to each other.

[0023] Displacement acquisition components include two laser displacement gauges (such as Keyence IL030) (eddy current displacement gauges can also be used here; any non-contact sensor capable of measuring displacement can be used), an NI acquisition chassis (NI9171 / 9174 chassis optional), and an NI9234 acquisition card. The two laser displacement gauges are installed one-to-one on the mounting positions of the orthogonal positioning fixture, respectively for detecting the X and Y displacements of the spindle. The NI9234 acquisition card is adapted to the NI acquisition chassis and has three signal channels: CH0, CH1, and CH2. CH0 and CH1 are connected to the two laser displacement gauges respectively, enabling synchronous acquisition of X and Y displacement signals. The NI acquisition chassis communicates with the host computer via USB to complete signal transmission.

[0024] Rotational speed acquisition component: includes a tachometer, a highly reflective sticker, and a BNC shielded cable. The highly reflective sticker is affixed to the rotating end face of the flywheel spindle. The tachometer is fixed to the magnetic base bracket via a bracket, aligned with the reflective sticker, and used to acquire the real-time rotational speed signal of the flywheel spindle. The tachometer output signal is connected to the CH2 channel of the NI9234 acquisition card via the BNC shielded cable for synchronous acquisition with the displacement signal.

[0025] Power supply adapter assembly: includes a laser displacement gauge adapter board, a BNC shielded connector, and a shielded cable. The adapter board connects to the laser displacement gauge and the NI9234 data acquisition card to achieve stable transfer of displacement signals; the BNC shielded connector and the shielded cable work together to reduce electromagnetic interference on site, while providing power support for the laser displacement gauge and tachometer.

[0026] In this embodiment, during the dynamic spindle runout test of a precision forging press for connecting rods of an automobile engine, the tester first disassembled and attached the magnetic seat bracket in the positioning frame assembly to the upper side wall of the press body, ensuring that the center line connecting the two mounting positions of the right-angle orthogonal positioning fixture forms a 90-degree angle and is aligned with the X and Y directions of the spindle radial direction, respectively; the two sets of laser displacement sensors in the displacement acquisition assembly are respectively locked to the two mounting positions by precision threads, so that their laser beams are orthogonally pointed to the spindle surface; the high-reflectivity sticker in the speed acquisition assembly is affixed to the rotating end face of the spindle, and the tachometer is fixed to the front of the spindle by the magnetic seat bracket and precisely aligned with the sticker.

[0027] The power supply adapter provides stable power and signal transmission to all sensors through shielded connectors and shielded cables. The signal acquisition card synchronously receives radial displacement and spindle speed signals at a sampling rate of 1 kHz per channel. After the press is started and runs under simulated conditions at 40 times per minute, the upper control component performs Kalman filtering and zero drift correction on the signal according to the pre-configured filtering parameters, plots the spindle runout trajectory in the XY plane in real time, and calculates the maximum runout amplitude of 0.023 mm and the runout phase angle. The test results are judged to be qualified after being compared with the equipment's factory standard (runout ≤ 0.05 mm), providing a quantitative basis for the spindle's operating status for subsequent precision forging processes.

[0028] Preferably, the host control component includes a signal acquisition module, a control module, and an interactive display module; The signal acquisition module is connected to the signal acquisition card and the shielded cable, respectively, and is used to receive the spindle speed signal and the radial displacement signal and transmit them to the control module. The control module is used to configure the working mode of the signal acquisition card, the operating mode and signal filtering parameters of the signal channel, receive and process the spindle speed signal and radial displacement signal, calculate the spindle runout, and transmit it to the interactive display module. The interactive display module is used to establish a coordinate system based on the radial axis and, in conjunction with the spindle runout, generate a spindle runout trajectory diagram of the press.

[0029] In this embodiment, the signal acquisition module receives radial position changes from two sets of laser displacement sensors in real time at a sampling rate of 1 kHz per channel via a high-speed synchronous acquisition card. This data is converted into radial displacement signals and rotational speed pulse signals from the photoelectric tachometer, and then synchronously transmitted to the control module. The control module first configures the signal acquisition card to differential input mode and enables anti-aliasing filtering (cutoff frequency set to 20 kHz). Then, it performs frequency multiplication on the spindle speed signal to extract 1024 equally spaced sampling points per revolution. Simultaneously, it performs zero-drift correction and moving average filtering on the radial displacement signal (window width of 5 sampling points). Based on the orthogonal decomposition algorithm, it calculates the spindle yaw amplitude and phase angle per revolution in the XY plane. The interactive display module establishes a polar coordinate system with the spindle's static center as the origin. It overlays the yaw data from 200 consecutive revolutions to create a spindle yaw trajectory diagram, and marks the maximum yaw amount (e.g., 0.023 mm) and its corresponding phase on the interface. Simultaneously, it compares this with a preset qualified threshold (yaw amount ≤ 0.05 mm) to generate a test report for on-site engineers to determine the spindle's operating status.

[0030] Preferably, refer to Figure 3 The control module includes: The parameter configuration unit is used to set the working mode of the signal acquisition card to AC coupling mode, and to configure the operating mode of the signal channel to pulse signal acquisition mode and voltage signal acquisition mode respectively, and to determine the signal filtering parameters. The signal processing unit is used to filter the radial displacement signal according to the signal filtering parameters and the spindle speed signal, and convert the radial displacement signal according to the preset sensitivity to obtain the actual radial displacement. The drawing and display unit is used to perform fusion calculations on the actual radial displacement based on the radial type to obtain the spindle runout, and then, in conjunction with the radial fusion coordinate system, generate a spindle runout trajectory diagram of the press.

[0031] The radial fusion coordinate system is as follows: X-axis displacement is used as the horizontal coordinate, and Y-axis displacement is used as the vertical coordinate.

[0032] In this embodiment, the parameter configuration unit of the control module first sets the signal acquisition card's working mode to AC coupling mode to filter out DC component interference, and configures one signal channel as pulse signal acquisition mode, while configuring the other two channels as pulse signal acquisition mode. Simultaneously, it sets the bandpass filtering parameters (in this embodiment, the spindle speed is 4.6 Hz, and the passband frequency is 4.6 ± 0.5 Hz) to extract the effective spindle vibration components. The signal processing unit synchronously filters the speed pulse signal and radial displacement signal according to these filtering parameters, and, combined with the pre-calibrated sensitivity (0.2 μm / mV) of the laser displacement sensor, converts the original voltage signal into actual radial displacement. It then calculates the real-time displacement values ​​in the X and Y directions through orthogonal decomposition. The drawing and display unit constructs a radial fusion coordinate system with the spindle static center as the origin, X-axis displacement as the abscissa, and Y-axis displacement as the ordinate. It performs trajectory fusion calculations on the actual radial displacement within 200 consecutive rotation cycles to generate a spindle yaw trajectory diagram, and automatically labels the maximum yaw amplitude (e.g., 0.023 mm) and its corresponding phase angle on the interface, compared to the device's allowable 0.05°. After comparing the mm threshold, the qualified judgment result is output, which provides a quantitative basis for the spindle operation status for subsequent precision forging processes.

[0033] Reference Figure 4 A measurement method for a yaw test setup device, comprising: The magnetic base bracket is erected and fixed to the press body, and is located within the safe distance range of the press spindle. Two sets of displacement gauges are installed on the mounting position of the right-angle orthogonal positioning fixture. The measuring distance of the displacement gauge is adjusted to the midpoint of its measuring range, so that the measuring optical axis of the displacement gauge is aligned with the spindle radially from the press spindle, and the two measuring optical axes are kept at 90° orthogonal. Adhere a highly reflective sticker to the rotating end face of the press spindle, align the tachometer with the reflective sticker, and fix the tachometer bracket on the magnetic base bracket. Turn on the power to all components and rotate the press spindle one revolution to confirm that the displacement gauge, tachometer and press spindle are not in contact or interfere with each other, and that all components are securely connected and that there are no abnormalities in signal transmission. Open the parameter configuration unit of the host computer, set the working mode of the signal acquisition card to AC coupling mode, configure the operating mode of the first and second signal channels of the signal acquisition card to voltage signal acquisition mode, and configure the sensitivity of the third signal channel to pulse signal acquisition mode according to the displacement meter model, and determine the signal filtering parameters. The press is started, and the spindle reaches the stable speed to be detected. The displacement gauges in the X and Y directions and the tachometer in the Y direction are activated to simultaneously collect the dynamic displacement signals and speed signals of the press spindle in the X and Y directions. All signals are then transmitted to the signal processing unit via the signal acquisition module. The signal processing unit converts the dynamic displacement signals in the X and Y directions into actual radial displacements according to a preset sensitivity, and combines them with the rotational speed signal to filter the signals according to the signal filtering parameters to obtain real-time displacement data in the X and Y directions, and calculates the spindle runout. Construct a radially fused coordinate system using the X-axis displacement as the abscissa and the Y-axis displacement as the ordinate, and then adjust the coordinates according to the principal axis yaw (refer to...). Figure 5 (See the data marked in yellow) to draw and generate the spindle runout trajectory diagram of the press (refer to...). Figure 6 The spindle runout test is now complete.

[0034] In this embodiment, the magnetic base bracket of the positioning and mounting assembly is adsorbed and fixed on the press body near the main shaft. Two sets of laser displacement gauges are installed on the mounting position of the 90° orthogonal positioning fixture. The measuring distance of the laser displacement gauge is adjusted to the midpoint of its range so that the measuring optical axis of the laser displacement gauge is aligned radially with the side of the press main shaft (flywheel main shaft), and the two optical axes are kept at 90° orthogonal. A highly reflective sticker is pasted on the rotating end face of the flywheel main shaft, the tachometer is aligned with the reflective sticker, and the tachometer bracket is fixed on the magnetic base bracket.

[0035] Connect the X-axis laser displacement meter to the CH0 channel of the NI9234 acquisition card via the adapter board of the power supply component and the BNC shielded cable, connect the Y-axis laser displacement meter to the CH1 channel, and connect the tachometer to the CH2 channel; connect the NI acquisition chassis to the host computer via USB and turn on the power to all components; manually rotate the press spindle one revolution to confirm that the laser displacement meter, tachometer and spindle are not in contact or interfered with, and that all components are securely connected and that there are no abnormalities in signal transmission.

[0036] Open the signal processing software developed based on LabVIEW on the host computer, configure the NI9234 acquisition card to AC coupling mode, set the sensitivity of the X and Y displacement signal channels according to the selected laser displacement meter model (e.g., 200mV / mm for Keyence IL030), configure the rotation speed channel to pulse signal acquisition mode, set the filtering parameters, and complete the parameter matching of signal acquisition and physical quantity conversion.

[0037] Start the press and bring the spindle to the stable speed to be tested. Click the acquisition button on the host computer software. The displacement acquisition component and the speed acquisition component will synchronously acquire the dynamic displacement signal and speed signal of the spindle in the X and Y directions and transmit the signal to the host computer.

[0038] The host computer software converts the collected signals into actual displacement physical quantities (mm level) according to the preset sensitivity, and filters the displacement signals in combination with the rotation speed signal to filter out environmental interference; it calculates the spindle runout through the real-time displacement data in the X and Y directions, and at the same time plots the runout trajectory of the press spindle in real time with the X-direction displacement as the horizontal axis and the Y-direction displacement as the vertical axis to complete the spindle runout test.

[0039] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A press main shaft runout test fixture apparatus, characterized by, include: The positioning and mounting assembly is mounted on the press body and is used for orthogonally positioning the radial direction of the press spindle; The speed acquisition component is installed on the rotating end face of the press spindle and the positioning bracket assembly to monitor the operating status of the press spindle and acquire the spindle speed signal; A displacement acquisition component, mounted on the positioning frame component, is used to detect the radial running trajectory of the press spindle and acquire radial displacement signals. The upper-level control component is connected to the speed acquisition component and the displacement acquisition component respectively. It is used to configure the operating mode and filtering parameters of the signal channel, and to receive and analyze the spindle speed signal and the radial displacement signal to draw the spindle runout trajectory diagram of the press. The power supply adapter is connected to the above-mentioned components and is used to supply power and transfer signals to the above-mentioned components.

2. The press spindle runout test set-up of claim 1, wherein: The positioning frame assembly includes a magnetic base bracket and a right-angle orthogonal positioning fixture; The magnetic base bracket is detached and attached to the press body; The right-angle orthogonal positioning fixture is set on the magnetic base bracket and includes two mounting positions, with the included angle of the center line connecting the mounting positions being 90 degrees, for mounting the displacement acquisition component.

3. The press spindle runout test fixture of claim 1 wherein: The rotation speed acquisition component includes a tachometer, a highly reflective sticker, and a shielded cable; The highly reflective sticker is affixed to the rotating end face of the press spindle. The tachometer is fixed to the magnetic base bracket and located in front of the press spindle, and aligned with the highly reflective sticker. It is used to detect the light signal reflected by the highly reflective sticker and convert it into a spindle speed signal. The shielded cable is used to transmit the spindle speed signal to the upper control component.

4. The press spindle runout test fixture of claim 1 wherein: The displacement acquisition component includes a displacement gauge and a signal acquisition card; The displacement gauge is fixed to the mounting position of the right-angle orthogonal positioning fixture and is used to detect the radial position change of the press spindle and convert it into a radial displacement signal. The signal acquisition card is connected to the displacement gauge and includes several signal channels for receiving and transmitting the radial displacement signal to the upper control component through the signal channels.

5. The press ram shaft runout test fixture of claim 1 wherein, The upper-level control component includes a signal acquisition module, a control module, and an interactive display module; The signal acquisition module is connected to the signal acquisition card and shielded cable, and is used to receive spindle speed signals and radial displacement signals, and transmit them to the control module. The control module is used to configure the working mode of the signal acquisition card, configure the operating mode and signal filtering parameters of the signal channel, receive and process the spindle speed signal and the radial displacement signal, calculate the spindle runout, and transmit it to the interactive display module. The interactive display module is used to establish a coordinate system based on the radial axis and, in conjunction with the spindle runout, generate a spindle runout trajectory diagram of the press.

6. The press ram runout test fixture of claim 5 wherein, The control module includes: The parameter configuration unit is used to set the working mode of the signal acquisition card to AC coupling mode, and to configure the operating mode of the signal channel to pulse signal acquisition mode and voltage signal acquisition mode respectively, and to determine the signal filtering parameters. The signal processing unit is used to filter the radial displacement signal according to the signal filtering parameters and the spindle speed signal, and to convert the radial displacement signal according to the preset sensitivity to obtain the actual radial displacement. A drawing and display unit is used to perform a fusion calculation on the actual radial displacement based on the radial type to obtain the spindle runout, and to generate a spindle runout trajectory diagram of the press machine by combining it with the radial fusion coordinate system.

7. The test setup for the runout of a press spindle according to claim 6, characterized in that, The radial fusion coordinate system is as follows: the X-axis displacement is used as the horizontal coordinate, and the Y-axis displacement is used as the vertical coordinate.

8. The test setup for the runout of a press spindle according to claim 1, characterized in that, The power supply adapter assembly includes a bit adapter plate and a shielded connector; The adapter board is connected to the displacement gauge and the signal acquisition card respectively, and is used to realize the stable transfer of displacement signals; The shielded connector works in conjunction with the shielded cable to suppress electromagnetic interference on site, while also supplying power to the displacement gauge and tachometer.

9. A measuring method for a yaw test rigging device, applied to the device according to any one of claims 1-8, characterized in that, include: The magnetic base bracket is erected and fixed to the press body, and is located within the safe distance range of the press spindle. Two sets of displacement gauges are installed on the mounting position of the right-angle orthogonal positioning fixture. The measuring distance of the displacement gauge is adjusted to the midpoint of its measuring range, so that the measuring optical axis of the displacement gauge is aligned with the spindle radially from the press spindle, and the two measuring optical axes are kept at 90° orthogonal. Adhere a highly reflective sticker to the rotating end face of the press spindle, align the tachometer with the reflective sticker, and fix the tachometer bracket on the magnetic base bracket. Turn on the power to all components and rotate the press spindle one revolution to confirm that the displacement gauge, tachometer and press spindle are not in contact or interfere with each other, and that all components are securely connected and that there are no abnormalities in signal transmission. Open the parameter configuration unit of the host computer, set the working mode of the signal acquisition card to AC coupling mode, configure the operating mode of the first and second signal channels of the signal acquisition card to voltage signal acquisition mode, and configure the sensitivity of the third signal channel to pulse signal acquisition mode according to the displacement meter model, and determine the signal filtering parameters. The press is started, and the spindle reaches the stable speed to be detected. The displacement gauges in the X and Y directions and the tachometer in the Y direction are activated to simultaneously collect the dynamic displacement signals and speed signals of the press spindle in the X and Y directions. All signals are then transmitted to the signal processing unit via the signal acquisition module. The signal processing unit converts the dynamic displacement signals in the X and Y directions into actual radial displacements according to a preset sensitivity, and combines them with the rotational speed signal to filter the signals according to the signal filtering parameters to obtain real-time displacement data in the X and Y directions, and calculates the spindle runout. Using the X-axis displacement as the abscissa and the Y-axis displacement as the ordinate, a radial fusion coordinate system is constructed, and plotted according to the spindle runout to generate the spindle runout trajectory diagram of the press. The spindle runout test is then completed.

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