Axial thrust-torque composite calibration standard device

Abstract

The present application relates to a kind of axial thrust-torque composite calibration standard devices, including axial thrust torque loading host computer and high-precision hydraulic load servo control system.Axial thrust torque loading host computer, for installing the sensor to be calibrated, and the thrust load and torque load are applied to the sensor to be calibrated;High-precision hydraulic load servo control system is composed of reference standard instrument, calibrated piece acquisition instrument, servo hydraulic control system and control computer, and servo control system is connected to axial thrust torque loading host computer, and control computer is connected with standard force sensor and standard torque sensor respectively by reference standard instrument arranged on axial thrust torque loading host computer and is connected with the sensor to be calibrated by calibrated piece acquisition instrument, and control computer is also connected with high-precision hydraulic load servo control system.The device can simultaneously realize single-component independent calibration and double-component composite calibration, with the advantages such as load feedback control precision, to meet the increasingly complex high-precision engineering measurement demand.

Description

Technical Field

[0001] This invention relates to an apparatus and method for calibrating a dual-component measuring instrument for axial thrust and torque, specifically to an axial thrust-torque composite calibration standard apparatus and its calibration method. Background Technology

[0002] In the field of engineering measurement, the demand for calibration instruments measuring both axial thrust and torque components is increasing. Existing calibration devices have limitations, such as low accuracy due to the coupling between axial thrust and torque, limited functionality (unable to simultaneously perform single-component independent calibration and dual-component composite calibration), and insufficiently precise load feedback control, failing to meet the increasingly complex high-precision engineering measurement needs. For example, patent publication CN216050441U discloses a dynamic calibration device for thrust and torque under combined thrust and torque loads. A drive motor is connected to the test piece via a coupling. The test piece is connected to a load motor via a high-precision standard torque sensor. A steady-state component connects the test piece and the high-precision standard torque sensor, ensuring the stability of the axial force under dynamic conditions. Weight pans are connected to the connecting shafts at both ends of the steady-state component, with standard weights stacked on the pans to apply force to the test piece. Constant torque output is achieved through braking control of the load motor, applying a certain amount of damping to the test piece. Force loading is achieved using high-precision weights, and a steady-state component ensures the stability of the thrust during dynamic rotation. The connection between the device and the high-precision standard torque sensor uses a rolling spline pair, which reduces the influence of axial force on torque, enabling torque calibration of the measured component under dynamic conditions. Therefore, there is a need to invent an axial thrust-torque composite calibration standard device to solve the aforementioned problems in the existing technology. Summary of the Invention

[0003] The purpose of this invention is to provide an axial thrust-torque composite calibration standard device to solve the limitations of existing calibration devices, such as low accuracy due to the coupling between axial thrust and torque, single function (unable to simultaneously achieve single-component independent calibration and dual-component composite calibration), and insufficient load feedback control, which cannot meet the increasingly complex high-precision engineering measurement needs.

[0004] To achieve the above objectives, the technical solution of the present invention is: an axial thrust-torque composite calibration standard device, comprising an axial thrust-torque loading host and a high-precision hydraulic load servo control system. The axial thrust-torque loading host is used to mount the sensor to be calibrated and to apply thrust and torque loads to the sensor. The high-precision hydraulic load servo control system consists of a reference standard instrument, a calibrated component acquisition instrument, a servo hydraulic control system, and a control computer. The servo control system is connected to the axial thrust-torque loading host. The control computer is connected to the standard force sensor and standard torque sensor mounted on the axial thrust-torque loading host via the reference standard instrument, and to the calibrated sensor via the calibrated component acquisition instrument. The control computer is also connected to the high-precision hydraulic load servo control system.

[0005] Furthermore, the axial thrust torque loading host includes a frame, a torque loading mechanism, an axial thrust loading mechanism, and a positioning and mounting mechanism. The positioning and mounting mechanism is installed in the middle of the frame, the axial thrust loading mechanism is installed at the top, and the torque loading mechanism is installed at the bottom.

[0006] Furthermore, the frame consists of an upper beam, left and right columns, positioning columns, a middle beam, a base, a lower column, and a foundation. The base is fixedly connected to the foundation via the lower column, and the middle beam and upper beam are fixedly connected to the base via the left and right columns. Positioning columns are provided next to the left and right columns.

[0007] Furthermore, the torque loading mechanism consists of a swing cylinder, a standard torque sensor, a coupling, a rotating pressure plate, a deep groove ball bearing, and a thrust ball bearing. The swing cylinder is installed under the base of the frame and is connected to the rotating pressure plate through the standard torque sensor and the coupling. The shaft of the rotating pressure plate is connected to the middle beam of the frame through the deep groove ball bearing and the thrust ball bearing.

[0008] Furthermore, the axial thrust loading mechanism consists of a hydraulic cylinder, a standard force sensor, a connecting ball seat, a pressing connecting plate, and a linear guide pair. The pressing connecting plate is connected to the left and right columns of the frame through the linear guide pair. The standard force sensor and the hydraulic cylinder are connected to the pressing connecting plate through the connecting ball seat. The hydraulic cylinder is mounted on the upper beam of the frame.

[0009] Furthermore, the installation and positioning mechanism consists of an upper connecting fixture and a lower connecting fixture. The upper connecting fixture is installed on the pressing connecting plate, and the lower connecting fixture is installed on the rotating pressure plate. The sensor to be calibrated is installed between the upper connecting fixture and the lower connecting fixture.

[0010] Furthermore, both the upper and lower connecting fixtures are equipped with "cross" bosses, which are connected to the "cross" grooves pressing against the connecting plate and the middle beam, respectively, for the accurate installation of the sensor to be calibrated.

[0011] Furthermore, during operation, the hydraulic servo control system inputs hydraulic oil into the axial thrust hydraulic cylinder and the swing cylinder respectively, causing the hydraulic cylinder and the swing cylinder to generate thrust load and torque load respectively. The signals generated by the standard force sensor and the standard torque sensor are transmitted to the reference standard instrument and then to the control computer. The control computer analyzes the deviation between the applied load and the target load, and controls the hydraulic servo control system to control the amount and speed of hydraulic oil input into the axial thrust hydraulic cylinder and the swing cylinder, thereby achieving precise control of the applied thrust load and torque load.

[0012] Furthermore, when axial thrust is applied, the axial force generated by the hydraulic cylinder is transmitted to the sensor under calibration through the standard force sensor, connecting ball seat, pressing connecting plate, and upper connecting fixture. Then, it is transmitted downward to the lower connecting fixture and rotating pressure plate. Under the action of the rotating pressure plate and the thrust ball bearing and deep groove ball bearing, the axial thrust is completely transmitted to the middle beam and frame, so that the axial thrust is not applied to the torque standard sensor, thereby realizing the mechanical decoupling of the torque standard sensor and the axial thrust.

[0013] Furthermore, during torque loading, the torque generated by the swing cylinder is sequentially transmitted upwards to the standard torque sensor, coupling, rotating pressure plate, lower connecting fixture, and the sensor being calibrated. The torque continues to be transmitted upwards to the upper connecting fixture and the pressing connecting plate. The interaction between the pressing connecting plate and the column of the frame generates a reverse torque. Since the standard force sensor and the pressing connecting plate are directly connected by a ball seat, the torque cannot be transmitted to the standard force sensor. The torque is completely transmitted to the column of the frame, thus ensuring that the standard force sensor is not affected by the torque and achieving mechanical decoupling between the standard force sensor and the torque.

[0014] The beneficial effects of this invention are:

[0015] (1) The axial thrust-torque composite calibration standard device of the present invention can simultaneously realize single-component independent calibration and dual-component composite calibration, and has the advantages of accurate load feedback control, which meets the increasingly complex high-precision engineering measurement needs.

[0016] (2) The axial thrust-torque composite calibration standard device of the present invention mainly consists of an axial thrust-torque loading host and a high-precision hydraulic load servo control system. Through a special structural design, mechanical decoupling of axial thrust and torque is achieved, effectively avoiding the low accuracy problem caused by mutual coupling between axial thrust and torque. This device... Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the axial thrust-torque composite calibration standard device of the present invention;

[0018] Figure 2 This is a three-dimensional schematic diagram of the main structure for axial thrust torque loading;

[0019] Figure 3 This is a cross-sectional view of the main structure under axial thrust and torque loading.

[0020] Figure 4 This is a diagram showing the connection fixtures and connections for the calibration device;

[0021] Figure 5 This is a schematic diagram of the connecting fixture;

[0022] In the diagram: 1-Hydraulic cylinder, 2-Frame, 2-1-Upper beam, 2-2-Left and right columns, 2-3-Positioning column, 2-4-Middle beam, 2-5-Base, 2-6-Lower column, 2-7 Foundation base, 3-Standard force sensor, 4-Connecting ball seat, 5-Pressure connecting plate, 6-Upper connecting fixture, 7-Linear guide pair, 8-Sensor under calibration, 9-Lower connecting fixture, 10-Rotating pressure plate, 11-Deep groove ball bearing, 12-Thrust ball bearing, 13-Coupling, 14-Standard torque sensor, 15-Swing cylinder, 16-Reference standard instrument, 17-Acquisition instrument for calibrated part, 18-Servo hydraulic control system, 19-Control computer, 20-Positioning installation mechanism. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown in the figure, an axial thrust-torque composite calibration standard device provided by an embodiment of the present invention includes an axial thrust-torque loading host and a high-precision hydraulic load servo control system. The axial thrust-torque loading host is used to mount the sensor to be calibrated and apply thrust and torque loads to the sensor. The high-precision hydraulic load servo control system consists of a reference standard instrument, a calibrated component acquisition instrument, a servo hydraulic control system, and a control computer. The servo control system is connected to the axial thrust-torque loading host. The control computer is connected to the standard force sensor and standard torque sensor mounted on the axial thrust-torque loading host via the reference standard instrument, and to the calibrated sensor via the calibrated component acquisition instrument. The control computer is also connected to the high-precision hydraulic load servo control system.

[0025] The axial thrust torque loading host includes a frame 2, a torque loading mechanism, an axial thrust loading mechanism, and a positioning and mounting mechanism 20. The positioning and mounting mechanism 20 is installed in the middle of the frame 2, the axial thrust loading mechanism is installed at the top, and the torque loading mechanism is installed at the bottom.

[0026] The frame 2 consists of an upper beam 2-1, left and right uprights 2-2, positioning uprights 2-3, a middle beam 2-4, a base 2-5, a lower upright 2-6, and a foundation 2-7. The base 2-7 is fixedly connected to the base 2-5 via the lower uprights 2-6. The base 2-5 is fixedly connected to the middle beam 2-4 and the upper beam 2-1 via the left and right uprights 2-2. Positioning uprights 2-3 are located beside the left and right uprights 2-2. All connections can be made by thread or welding. The frame is used to bear the torque and thrust during testing and provides an installation position for the thrust-torque measuring device being calibrated.

[0027] The torque loading mechanism consists of a swing cylinder 15, a standard torque sensor 14, a coupling 13, a rotating pressure plate 10, a deep groove ball bearing 11, and a thrust ball bearing 12. The swing cylinder 15 is installed under the base of the frame 2 and is connected to the rotating pressure plate 10 through the standard torque sensor 14 and the coupling 13. The shaft of the rotating pressure plate 10 is connected to the middle beam of the frame 2 through the deep groove ball bearing 11 and the thrust ball bearing 12.

[0028] The axial thrust loading mechanism consists of a hydraulic cylinder 1, a standard force sensor 3, a connecting ball seat 4, a pressing connecting plate 5, and a linear guide pair 7. The pressing connecting plate 5 is connected to the left and right columns of the frame 2 via the linear guide pair 7. The standard force sensor 3 and the hydraulic cylinder 1 are connected to the pressing connecting plate 5 via the connecting ball seat 4. The hydraulic cylinder 1 is mounted on the upper beam of the frame 2.

[0029] The mounting and positioning mechanism consists of an upper connecting fixture 6 and a lower connecting fixture 9. The upper connecting fixture 6 is mounted on the pressing connecting plate 5, and the lower connecting fixture 9 is mounted on the rotating pressure plate 10. The sensor to be calibrated 8 is installed between the upper connecting fixture 6 and the lower connecting fixture 9.

[0030] During operation, the hydraulic servo control system inputs hydraulic oil into the axial thrust hydraulic cylinder 1 and the swing cylinder 15, causing them to generate thrust load and torque load, respectively. Signals generated by the standard force sensor 3 and the standard torque sensor 14 are transmitted to the reference standard instrument 16 and then to the control computer 19. The control computer 19 analyzes the deviation between the applied load and the target load, and controls the hydraulic servo control system to control the quantity and speed of the hydraulic oil input into the axial thrust hydraulic cylinder 1 and the swing cylinder 15, thereby achieving precise control of the applied thrust load and torque load.

[0031] When the axial thrust-torque composite calibration standard device is in operation, the sensor 8 to be calibrated is connected to the upper connecting fixture 6 and the lower connecting fixture 9 respectively. Then, it is placed into the device. Since both the upper connecting fixture 6 and the lower connecting fixture 9 have "cross" protrusions, after placement into the device, the cross protrusions of the upper connecting fixture 6 and the lower connecting fixture 9 fall into the "cross" grooves pressing against the connecting plate 5 and the middle beam, respectively. This ensures the accurate installation of the device being calibrated.

[0032] When axial thrust is applied, the axial thrust is generated by hydraulic cylinder 1. This axial force is transmitted to the standard force sensor 3, connecting ball seat 4, pressing connecting plate 5, upper connecting fixture 6, and finally to the sensor being calibrated 8. Then, it is transmitted downwards to the lower connecting fixture 9 and rotating pressure plate 10. Since the rotating pressure plate 10 is connected to the thrust ball bearing 12 and deep groove ball bearing 11, the force is completely transmitted to the middle beam and frame 2. Therefore, during this process, the thrust is not applied to the torque standard sensor 14. Thus, the torque standard sensor 14 is not affected by the axial thrust, achieving mechanical decoupling between the torque standard sensor 14 and the axial thrust.

[0033] During torque loading, torque is generated through the swing cylinder 15. The torque generated by the swing cylinder 15 is sequentially transmitted upwards to the standard torque sensor 14, coupling 13, rotating pressure plate 10, lower connecting fixture 9, and the sensor under calibration 8. Then, the torque continues to be transmitted upwards to the upper connecting fixture 6 and the pressing connecting plate 5. Because the pressing connecting plate 5 interacts with the column to generate a reverse torque, and the standard force sensor 3 is directly connected to the pressing connecting plate 5 via the connecting ball seat 4, the torque cannot be transmitted to the standard force sensor 3; the torque is completely transmitted to the column. Therefore, the standard force sensor 3 is not affected by the torque, achieving mechanical decoupling between the standard force sensor 3 and the torque.

[0034] The axial thrust hydraulic cylinder 1 and the swing cylinder 15 are connected to the hydraulic servo control system via oil pipes. The standard force sensor 3 and the standard torque sensor 14 are connected to the reference standard instrument 16. In this example, which is a specific embodiment, the axial thrust applied by the hydraulic cylinder is 200kN and the torque applied by the swing cylinder is 200kNm. By employing the axial thrust-torque composite calibration standard device of the present invention, the rated maximum output force of the axial thrust-torque composite calibration standard device can be 200kN, the force repeatability ≤0.1%, the load fluctuation / 30min ≤0.03%, and the force stability holding time ≥30min; the rated maximum output torque can be 200kNm, the torque repeatability ≤0.1%, the torque fluctuation / 30min ≤0.03%, and the torque stability holding time ≥30min.

Claims

1. An axial thrust-torque composite calibration standard device, characterized in that: It includes an axial thrust torque loading host and a high-precision hydraulic load servo control system; the axial thrust torque loading host is used to install the sensor under calibration and apply thrust load and torque load to the sensor under calibration; The high-precision hydraulic load servo control system consists of a reference standard instrument, a calibration component acquisition instrument, a servo hydraulic control system, and a control computer. The servo control system is connected to the axial thrust torque loading host. The control computer is connected to the standard force sensor and standard torque sensor mounted on the axial thrust torque loading host via the reference standard instrument, and to the calibration sensor via the calibration component acquisition instrument. The control computer is also connected to the high-precision hydraulic load servo control system. The axial thrust torque loading host includes a frame, a torque loading mechanism, an axial thrust loading mechanism, and a positioning and mounting mechanism. The positioning and mounting mechanism is mounted in the middle of the frame, the axial thrust loading mechanism is mounted at the top, and the torque loading mechanism is mounted at the bottom. The mounting and positioning mechanism consists of an upper connecting fixture and a lower connecting fixture. The upper connecting fixture is mounted on the pressure connecting plate, and the lower connecting fixture is mounted on the rotating pressure plate. The calibration sensor is installed between the upper and lower connecting fixtures. Both the upper and lower connecting fixtures have "cross" bosses, which mate with the "cross" grooves of the pressure connecting plate and the middle beam, respectively, for accurate installation of the calibration sensor.

2. The axial thrust-torque composite calibration standard device according to claim 1, characterized in that: The frame consists of an upper beam, left and right columns, positioning columns, a middle beam, a base, a lower column, and a foundation. The base is fixedly connected to the foundation via the lower column, and the middle beam and upper beam are fixedly connected to the base via the left and right columns. Positioning columns are located next to the left and right columns.

3. The axial thrust-torque composite calibration standard device according to claim 1, characterized in that: The torque loading mechanism consists of a swing cylinder, a standard torque sensor, a coupling, a rotating pressure plate, a deep groove ball bearing, and a thrust ball bearing. The swing cylinder is installed under the base of the frame and is connected to the rotating pressure plate through the standard torque sensor and the coupling. The shaft of the rotating pressure plate is connected to the middle beam of the frame through the deep groove ball bearing and the thrust ball bearing.

4. The axial thrust-torque composite calibration standard device according to claim 1, characterized in that: The axial thrust loading mechanism consists of a hydraulic cylinder, a standard force sensor, a connecting ball seat, a pressing connecting plate, and a linear guide pair. The pressing connecting plate is connected to the left and right columns of the frame through the linear guide pair. The standard force sensor and the hydraulic cylinder are connected to the pressing connecting plate through the connecting ball seat. The hydraulic cylinder is mounted on the upper beam of the frame.

5. The axial thrust-torque composite calibration standard device according to claim 1, characterized in that: During operation, the hydraulic servo control system inputs hydraulic oil into the axial thrust hydraulic cylinder and the swing cylinder respectively, causing the hydraulic cylinder and the swing cylinder to generate thrust load and torque load respectively. The signals generated by the standard force sensor and the standard torque sensor are transmitted to the reference standard instrument and then to the control computer. The control computer analyzes the deviation between the applied load and the target load, and controls the hydraulic servo control system to control the amount and speed of hydraulic oil input into the axial thrust hydraulic cylinder and the swing cylinder, thereby achieving precise control of the applied thrust load and torque load.

6. The axial thrust-torque composite calibration standard device according to claim 5, characterized in that: When axial thrust is applied, the axial force generated by the hydraulic cylinder is transmitted to the sensor under calibration through the standard force sensor, connecting ball seat, pressing connecting plate, and upper connecting fixture. Then, it is transmitted downward to the lower connecting fixture and rotating pressure plate. Under the action of the rotating pressure plate and the thrust ball bearing and deep groove ball bearing, the axial thrust is completely transmitted to the middle beam and frame, so that the axial thrust is not applied to the torque standard sensor, thereby realizing the mechanical decoupling of the torque standard sensor and the axial thrust.

7. The axial thrust-torque composite calibration standard device according to claim 5, characterized in that: When torque is applied, the torque generated by the swing cylinder is sequentially transmitted upwards to the standard torque sensor, coupling, rotating pressure plate, lower connecting fixture, and the sensor being calibrated. The torque continues to be transmitted upwards to the upper connecting fixture and the pressing connecting plate. The interaction between the pressing connecting plate and the column of the frame generates a reverse torque. Since the standard force sensor and the pressing connecting plate are directly connected by a ball seat, the torque cannot be transmitted to the standard force sensor. The torque is completely transmitted to the column of the frame, thus the standard force sensor is not affected by the torque, achieving mechanical decoupling between the standard force sensor and the torque.

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