Bidirectional shaft rigidity calibration equipment for aerospace high-precision shaft system

Abstract

An aerospace high-precision shafting bidirectional shaft rigidity calibration device comprises a measuring platform, the measuring platform is provided with a loading mechanism capable of applying bidirectional axial load to one end of a to-be-measured shafting in a loading state, and the loading mechanism is provided with an inner positioning loading end capable of penetrating through the hollow position of the to-be-measured shafting. The inner positioning loading end is detachably connected with a measuring tool, and the loading mechanism is provided with a bidirectional force sensor for detecting the magnitude of an applied axial load; the measuring platform is detachably connected with a measuring base, and the measuring base is matched with the measuring tool and can be fixed to the two ends of a shafting to be measured respectively. The calibration equipment can realize automatic detection, and human errors are reduced; the positioning speed of the shafting is high, the positioning is accurate, the bidirectional calibration of the shafting can be carried out without replacing the tool on the premise of ensuring the measurement accuracy, and the efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of shaft system measurement technology, specifically to a two-way shaft stiffness calibration device for high-precision aerospace shaft systems. Background Technology

[0002] Currently, in the rotary spindles used in the aerospace shafting components produced by our company, the shafting components are the core points in the overall machine assembly. In order to detect the assembly accuracy of the shafting components and ensure the mechanical performance of the whole machine, the axial stiffness of the shafting components needs to be calibrated after assembly to determine the consistency and reliability of the shafting components.

[0003] Existing methods for measuring shaft components involve manual calibration. The shaft component is fixed on an optical plate, and a spring scale is used to apply axial force to both sides of the rotating end of the shaft. This is used to detect the minute displacement changes exhibited by the shaft under load, and the displacement changes and shaft stiffness values ​​are manually recorded. This process involves excessive human intervention and is prone to accumulating human error. Each shaft component stiffness calibration takes approximately 0.5-1 hour. For bidirectional shaft stiffness calibration, the measuring fixture needs to be installed and disassembled multiple times during the calibration process. The disassembly process requires frequent repositioning of the shaft, which is inefficient and increases measurement error.

[0004] To address this, we propose a two-way shaft stiffness calibration device for high-precision aerospace shaft systems. Utility Model Content

[0005] The purpose of this invention is to propose a two-way shaft stiffness calibration device for high-precision aerospace shaft systems, which automatically detects and reduces human error; the shaft system has fast positioning speed and accurate positioning; and can perform two-way calibration of the shaft system without changing tooling while ensuring measurement accuracy, thus improving efficiency.

[0006] The technical solution adopted by this utility model is: a high-precision aerospace shaft system bidirectional shaft stiffness calibration device, including a measuring platform, a loading mechanism that can apply bidirectional axial load to one end of the shaft system to be measured when under load, the loading mechanism has an inner positioning loading end that can pass through the hollow position of the shaft system to be measured, the inner positioning loading end is detachably connected to a measuring fixture, and the loading mechanism is equipped with a bidirectional force sensor to detect the magnitude of the applied axial load.

[0007] The measuring platform is detachably connected to a measuring base, which, together with the measuring fixture, can be fixed to both ends of the shaft system to be measured.

[0008] The measuring platform is also equipped with a displacement sensor that can fit the measuring fixture to detect the axial displacement of the shaft system under test. The positioning center lines of the measuring base, the inner positioning loading end, the measuring fixture, and the displacement sensor are coincident.

[0009] As a preferred embodiment, the measuring platform is equipped with a clamping mechanism located outside the shaft system to be measured, which can position the measuring base.

[0010] As a preferred embodiment, the clamping mechanism includes no fewer than three servo motors arranged around the positioning center line on the measuring platform, and the output shaft of each servo motor is connected to a positioning rod via a swing arm;

[0011] The outer wall of the measuring base has a positioning outer circular surface that serves as the positioning reference for the positioning rod.

[0012] As a preferred embodiment, the inner diameter of the inner positioning loading end is adapted to the inner diameter of the corresponding connection end of the shaft system to be tested.

[0013] As a preferred embodiment, the loading mechanism is a cylinder, with the inner positioning loading end located at the end of the cylinder's telescopic arm. When the cylinder is in the loading state, it is in the middle position of its stroke. When the cylinder enters the loading state, it can drive the inner positioning loading end to rise or fall.

[0014] As a preferred embodiment, the measuring platform is provided with a positioning stop for centering the measuring base.

[0015] As a preferred embodiment, the measurement platform is equipped with a micrometer mechanism that is connected to and capable of adjusting the spatial position of the displacement sensor.

[0016] As a preferred embodiment, the micrometer mechanism includes a sensor fine-tuning screw and a sensor locking screw.

[0017] As a preferred embodiment, a host computer electrically connected to the displacement sensor is also included.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Automatic centering and positioning enable rapid clamping and accurate positioning of shaft components, thereby reducing workload, improving work efficiency, reducing human error, and ensuring the accuracy of measurement results.

[0020] 2. When the cylinder is in the middle of its stroke under load, the bidirectional shaft stiffness of the shaft system can be calibrated by using the bidirectional movable inner positioning loading end without changing the tooling.

[0021] The use of tooling is greatly reduced, and displacement measurement and force transmission are achieved with only one measuring tool, making operation more convenient and saving tooling costs.

[0022] 3. The internal positioning loading end, together with the positioning stop pin and clamping mechanism, centers the shaft system from both the inside and outside, improving the speed and accuracy of centering.

[0023] 4. The measured shaft system's displacement and applied load values ​​are collected and fed back in real time through a host computer. The stiffness value is then calculated by the computer, resulting in more reliable results and higher repeatability accuracy.

[0024] By adjusting the applied load, the shaft stiffness curve can be plotted based on the change in loading force, making the stiffness change of the shaft system under a certain span load clear at a glance, realizing multiple functions in one machine. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view schematic diagram of the present invention with partial cross-section;

[0027] Figure 2 This is a top view of the present invention.

[0028] Reference numerals: 1. Measuring platform; 2. Loading mechanism; 201. Internal positioning loading end; 3. Measuring fixture; 4. Bidirectional force sensor; 5. Measuring base; 501. Positioning outer circular surface; 6. Shaft to be measured; 7. Displacement sensor; 8. Clamping mechanism; 801. Servo motor; 802. Swing arm; 803. Positioning rod; 9. Positioning stop pin; 10. Micrometer mechanism; 11. Sensor fine-tuning screw; 12. Sensor locking screw; 13. Host computer; 14. Pneumatic unit. Detailed Implementation

[0029] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "a," "an," or "the," etc., used in this utility model patent application specification and claims do not express a quantity limitation, but rather indicate the presence of at least one; the terms "first," "second," and "third," as used herein, should not be considered as a limitation on the order of components, but are merely for distinguishing different components; the terms "comprising" or "including," etc., indicate that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0031] To more clearly describe the specific structural composition of this aerospace high-precision shaft system bidirectional shaft stiffness calibration device, in conjunction with the attached... Figure 1-2 This embodiment is described as follows:

[0032] like Figure 1 and Figure 2 As shown, a high-precision aerospace shaft system bidirectional shaft stiffness calibration device includes a measurement platform 1. The measurement platform 1 is equipped with a loading mechanism 2 that can apply bidirectional axial loads to one end of the shaft system 6 under test when under load. The loading mechanism 2 has an inner positioning loading end 201 that can pass through the hollow position of the shaft system under test. The inner positioning loading end 201 is detachably connected to a measuring fixture 3. The loading mechanism 2 is equipped with a bidirectional force sensor 4 for detecting the magnitude of the applied axial load. A measurement base 5 is detachably connected to the measurement platform 1. The measurement base 5, together with the measuring fixture 3, can be fixed to both ends of the shaft system 6 under test. The measurement platform 1 is also equipped with a displacement sensor 7 that can fit against the measuring fixture 3 to detect the axial displacement of the shaft system 6 under test. The positioning center lines of the measuring base 5, the inner positioning loading end 201, the measuring fixture 3, and the displacement sensor 7 coincide.

[0033] The measuring platform 1 can be made of QT600 cast iron, which has good rigidity and good shock absorption performance, providing a foundation for subsequent measurements; the measuring base 3 is used to replace and adapt shaft system components of different specifications and sizes to avoid damage to the shaft system under test during testing.

[0034] See Figure 1In the above embodiment, a clamping mechanism 8 is provided on the measuring platform 1, located outside the shaft system 6 to be measured, and capable of positioning the measuring base 5. The clamping mechanism 8 includes no fewer than three servo motors 801 arranged around the positioning center line on the measuring platform 1. The output shaft of each servo motor 801 is connected to a positioning rod 803 via a swing arm 802. The outer wall of the measuring base 5 has a positioning outer circular surface 501 that serves as the positioning reference for the positioning rod 803. The multiple servo motors 801 work simultaneously, and the positioning rod 803 clamps the positioning outer circular surface 501 to achieve positioning and clamping of the measuring base 5 and the shaft system 6 to be measured.

[0035] The inner positioning loading end 201 centers the shaft system to be measured from the inside, improving the speed and accuracy of centering. Specifically, it makes the inner positioning loading end 201 match the inner diameter of the corresponding connection end of the shaft system to be measured 6.

[0036] The loading mechanism 2 is a cylinder. The measuring platform 1 is equipped with a pneumatic unit 14 that supplies power to the cylinder. The inner positioning loading end 201 is located at the end of the cylinder's telescopic arm. When the cylinder is in the loading state, it is in the middle position of its stroke. When the cylinder enters the loading state, it can drive the inner positioning loading end 201 to rise or fall. Thus, with one end of the shaft system 6 to be measured fixed, it drives the other end to move, thereby detecting the deformation of the shaft system 6 to be measured.

[0037] Furthermore, the measuring platform 1 is provided with a positioning pin 9 for centering the measuring base 5, so as to realize the rapid centering of the measuring base.

[0038] The measuring platform 1 is equipped with a micrometer mechanism 10 that connects to and can adjust the spatial position of the displacement sensor 7. The micrometer mechanism 10 has a sensor fine-tuning screw 11 and a sensor locking screw 12. The displacement sensor 7 is located on the micrometer mechanism 10. During adjustment, first loosen the sensor locking screw 12, adjust the displacement sensor 7 to a suitable position in the Z-axis direction (vertical) using the sensor fine-tuning screw 11, and then tighten the sensor locking screw 12 to ensure that the displacement sensor 7 can make stable and effective contact with the measuring fixture 3.

[0039] It also includes a host computer 13 electrically connected to the displacement sensor 7. The host computer 13 can collect data and select the push or pull direction according to the measurement requirements, using the current sensor reading and the change in sensor reading after being subjected to push or pull loads. The computer calculates the bidirectional shaft stiffness based on the parameters and outputs the calculation results on the software interface.

[0040] The specific usage process is as follows:

[0041] Before measurement, one end of the shaft system 6 to be measured needs to be connected and fixed to the measuring base 5 as a whole. Then, it is pushed into the measuring platform 1 so that the inner positioning loading end 201, which is in the middle of the stroke, passes through the hollow cavity of the shaft system 6 to be measured. The measuring base 5 and the shaft system 6 to be measured are centered using the positioning stop pin 13. The clamping mechanism 8 is controlled by the host computer 12 to clamp the measuring base 5, thus completing the centering and positioning of the shaft system 6 to be measured. Then, the measuring fixture 3 is placed on the rotating end of the shaft system 6 to be measured. The outer hole of the measuring fixture 3 is connected to the rotating end by bolts, and the inner hole of the measuring fixture 3 is connected to the inner positioning loading end 201 by bolts.

[0042] The measurement includes the following steps:

[0043] Step 1: Adjust the micrometer mechanism 10 so that the probe of the displacement sensor 7 contacts the measuring fixture 3. The computer collects data from the displacement sensor 7 in real time. At this time, the current displacement value is displayed in the software of the host computer 13. This displacement value is the measurement baseline value. The subsequent bidirectional shaft stiffness measurement and calculation are all based on the change of this baseline value. According to operating habits, the micrometer mechanism 10 should be adjusted to return the displacement value to 0 so that the personnel can observe it during the measurement.

[0044] Step 2: Click "Thrust Loading" on the host computer software interface. The cylinder applies thrust under the control of the pneumatic unit 14, and the inner positioning loading end 201 descends. At this time, the thrust magnitude is controlled by the pneumatic unit regulating valve, while the bidirectional force sensor 4 provides real-time feedback on the current thrust magnitude.

[0045] Step 3: Click "Pull Force Loading" on the host computer software interface. The cylinder applies pull force under the control of the pneumatic unit 14, and the inner positioning loading end 201 rises. At this time, the magnitude of the pull force is controlled by the pneumatic unit regulating valve, while the bidirectional force sensor 4 provides real-time feedback on the current pull force magnitude.

[0046] Step 4: Through the above adjustments, the bidirectional shaft stiffness calibration of the shaft system can be performed. The computer collects the current displacement value and the push and pull force values ​​in real time to calculate the stiffness and output the stiffness calibration results. In the output results, the "+" value represents the thrust axial stiffness value, the "-" value represents the pull axial stiffness value, and the "+-" value represents the different directions of the applied force.

[0047] The parts not described in detail in the above embodiments are existing technologies.

[0048] It should be noted that although the present invention has been described through the above embodiments, there may be other various embodiments of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A two-way shaft stiffness calibration device for high-precision aerospace shaft systems, characterized in that: The system includes a measuring platform (1), which is equipped with a loading mechanism (2) that can apply a bidirectional axial load to one end of the shaft system (6) under load. The loading mechanism (2) has an inner positioning loading end (201) that can pass through the hollow position of the shaft system under load. The inner positioning loading end (201) is detachably connected to a measuring fixture (3). The loading mechanism (2) is equipped with a bidirectional force sensor (4) that detects the magnitude of the applied axial load. A measuring base (5) is detachably connected to the measuring platform (1). The measuring base (5) and the measuring fixture (3) can be fixed to both ends of the shaft system (6) to be measured. The measuring platform (1) is also equipped with a displacement sensor (7) that can fit the measuring fixture (3) to detect the axial displacement of the shaft system (6) to be measured. The positioning center lines of the measuring base (5), the inner positioning loading end (201), the measuring fixture (3), and the displacement sensor (7) coincide.

2. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: The measuring platform (1) is provided with a clamping mechanism (8) located outside the shaft system to be measured (6) and capable of positioning the measuring base (5).

3. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 2, characterized in that: The clamping mechanism (8) includes no less than three servo motors (801) arranged around the positioning center line on the measuring platform (1), and the output shaft of each servo motor (801) is connected to a positioning rod (803) through a swing arm (802). The outer wall of the measuring base (5) has a positioning outer circular surface (501) that serves as the positioning reference for the positioning rod (803).

4. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: The inner diameter of the inner positioning loading end (201) is adapted to the inner diameter of the corresponding connection end of the shaft system (6) to be measured.

5. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: The loading mechanism (2) is a cylinder. The inner positioning loading end (201) is located at the end of the telescopic arm of the cylinder. When the cylinder is in the loading state, it is in the middle position of the stroke. When the cylinder enters the loading state, it can drive the inner positioning loading end (201) to rise or fall.

6. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: The measuring platform (1) is provided with a positioning pin (9) for centering the measuring base (5).

7. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: The measuring platform (1) is equipped with a micrometer mechanism (10) that is connected to and can adjust the spatial position of the displacement sensor (7).

8. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 7, characterized in that: The micrometer mechanism (10) has a sensor fine-tuning screw (11) and a sensor locking screw (12).

9. The aerospace high-precision shaft system bidirectional shaft stiffness calibration device according to claim 1, characterized in that: It also includes a host computer (13) that is electrically connected to the displacement sensor (7).

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