Axial thrust-torque composite calibration standard device

Abstract

The invention relates to an axial thrust-torque composite calibration standard device which comprises an axial thrust-torque loading host and a high-precision hydraulic load servo control system. The axial thrust and torque loading host is used for installing a calibrated sensor and applying a thrust load and a torque load to the calibrated sensor; the high-precision hydraulic load servo control system is composed of a reference standard instrument, a calibrated piece collecting instrument, a servo hydraulic control system and a control computer, and the servo hydraulic control system is connected with an axial thrust torque loading host. The control computer is respectively connected with a standard force sensor and a standard torque sensor which are arranged on the axial thrust torque loading host through a reference standard instrument, is connected with a calibrated sensor through a calibrated piece acquisition instrument, and is also connected with a high-precision hydraulic load servo control system. The device can simultaneously realize single-component independent calibration and double-component composite calibration, has the advantages of accurate load feedback control and the like, and meets increasingly complicated high-precision engineering measurement requirements.

Description

Technical Field

[0001] The invention relates to a device and a method for calibrating an axial thrust and torque dual-component measuring instrument, and in particular to an axial thrust-torque composite calibration standard device and a calibration method thereof. Background Art

[0002] In the field of engineering measurement, the demand for calibration of axial thrust and torque dual-component measuring instruments is growing. Existing calibration devices have some limitations, such as low accuracy due to the mutual coupling between axial thrust and torque, single function (unable to simultaneously realize single-component independent calibration and dual-component composite calibration), and inaccurate load feedback control, which cannot meet the increasingly complex high-precision engineering measurement needs. For example, patent publication number CN216050441U discloses a thrust torque dynamic calibration device based on push-torsion composite load, in which the drive motor is connected to the measured object through a coupling, and the measured object is connected to the load motor through a high-precision standard torque sensor. A steady-state component is connected between the measured object and the high-precision standard torque sensor, and the steady-state component ensures the stability of the axial force under dynamic conditions; the connecting shafts at both ends of the steady-state component are respectively connected to weight hanging plates, and standard weights are stacked on the weight hanging plates to realize force loading of the measured object through standard weights. Constant torque output is achieved through the braking control of the load motor, and a certain damping is applied to the measured object. Force loading is achieved through high-precision weights, and a steady-state component is used to ensure the stability of the thrust of the device during dynamic rotation. The connection with the high-precision standard torque sensor adopts a rolling spline pair, which can reduce the influence of axial force on torque and realize the torque calibration of the measured part under dynamic conditions. Therefore, it is necessary to invent an axial thrust-torque composite calibration standard device to solve the above problems existing in the prior art. Summary of the invention

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

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: an axial thrust-torque composite calibration standard device, including 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 calibrated sensor and apply thrust load and torque load to the calibrated sensor; the high-precision hydraulic load servo control system is composed of a reference standard instrument, a calibrated component acquisition instrument, a servo hydraulic control system and a control computer. The pressure servo control system is connected to the axial thrust torque loading host, and the control computer is respectively connected to the standard force sensor and the standard torque sensor set on the axial thrust torque loading host through the reference standard instrument and connected to the calibrated sensor through 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 main machine 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 on the upper part, and the torque loading mechanism is installed on the lower part.

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

[0007] Furthermore, the torque loading mechanism is composed 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 center beam of the frame through the deep groove ball bearing and the thrust ball bearing.

[0008] Furthermore, the axial thrust loading mechanism is composed of a hydraulic cylinder, a standard force sensor, a connecting ball seat, a pressure connecting plate, and a linear guide pair. The pressure 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 pressure connecting plate through the connecting ball seat. The hydraulic cylinder is installed on the upper beam of the frame.

[0009] Furthermore, the installation and positioning mechanism is composed of an upper connecting tool and a lower connecting tool. The upper connecting tool is installed on the pressing connecting plate, and the lower connecting tool is installed on the rotating pressing plate. The calibrated sensor is installed between the upper connecting tool and the lower connecting tool.

[0010] Furthermore, both the upper connecting tooling and the lower connecting tooling are provided with a "cross" boss, and the cross bosses of the upper connecting tooling and the lower connecting tooling are respectively connected with the "cross" grooves of the pressing connecting plate and the middle beam for accurate installation of the calibrated sensor.

[0011] Furthermore, during operation, the hydraulic servo control system inputs hydraulic oil to the axial thrust hydraulic cylinder and the swing cylinder respectively, so that the hydraulic cylinder and the swing cylinder 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 transmitted to the control computer. The control computer controls the hydraulic servo control system to control the amount and speed of the hydraulic oil input to the axial thrust hydraulic cylinder and the swing cylinder by analyzing the deviation between the applied load and the target load, thereby achieving precise control of the applied thrust load and torque load.

[0012] Furthermore, when axial thrust is loaded, the axial force generated by the hydraulic cylinder is transmitted to the calibrated sensor through the standard force sensor, the connecting ball seat, the pressure connecting plate, and the upper connecting tooling, and then transmitted downward to the lower connecting tooling and the rotating pressure plate. Under the connection between the rotating pressure plate and the thrust ball bearing and the deep groove ball bearing, the axial thrust is completely transmitted to the center beam and the frame, so that the axial thrust will not be applied to the torque standard sensor, thereby realizing the mechanical decoupling of the torque standard sensor and the axial thrust.

[0013] Furthermore, when torque is loaded, the torque generated by the swing cylinder is transmitted upward to the standard torque sensor, the coupling, the rotating pressure plate, the lower connecting tooling and the calibrated sensor in sequence, and then the torque continues to be transmitted upward to the upper connecting tooling and the pressure connecting plate, where the pressure connecting plate interacts with the column of the frame to generate a reverse torque, and the standard force sensor and the pressure connecting plate directly use a connecting ball seat to prevent the torque from being transmitted to the standard force sensor. The torque is completely transmitted to the column of the frame, so that the standard force sensor is not affected by the torque, thereby realizing mechanical decoupling of the standard force sensor and the torque.

[0014] The beneficial effects of the present 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 precise load feedback control, etc., meeting the increasingly complex high-precision engineering measurement needs.

[0016] (2) The axial thrust-torque composite calibration standard device of the present invention is mainly composed of an axial thrust-torque loading host and a high-precision hydraulic load servo control system. The mechanical decoupling of axial thrust and torque is achieved through a special structural design, which can effectively avoid the low precision problem caused by the mutual coupling between axial thrust and torque. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a three-dimensional schematic diagram of the mainframe structure loaded with axial thrust torque;

[0019] Figure 3 It is a cross-sectional view of the mainframe structure loaded with axial thrust torque;

[0020] Figure 4 It is the connection tooling and connection diagram of the device to be calibrated;

[0021] Figure 5 It is a schematic diagram of the connection tooling;

[0022] In the figure: 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 base seat, 3-standard force sensor, 4-connecting ball seat, 5-pressure connecting plate, 6-upper connecting tooling, 7-linear guide pair, 8-calibrated sensor, 9-lower connecting tooling, 10-rotating pressure plate, 11-deep groove ball bearing, 12-thrust ball bearing, 13-coupling, 14-standard torque sensor, 15-swinging cylinder, 16-reference standard instrument, 17-calibrated component collection instrument, 18-servo hydraulic control system, 19-control computer, 20-positioning installation mechanism. DETAILED DESCRIPTION

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

[0024] like Figures 1 to 5 As shown, 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 install the calibrated sensor and apply thrust load and torque load to the calibrated 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 pressure servo control system is connected to the axial thrust torque loading host, and the control computer is respectively connected to the standard force sensor and the standard torque sensor set on the axial thrust torque loading host through the reference standard instrument, and is connected to the calibrated sensor through 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 main machine comprises 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 on the upper part, and the torque loading mechanism is installed on the lower part.

[0026] The frame 2 is composed of an upper beam 2-1, left and right columns 2-2, a positioning column 2-3, a middle beam 2-4, a base 2-5, a lower column 2-6, a base 2-7, etc. The base 2-7 is fixedly connected to the base 2-5 through the lower column 2-6, and the base 2-5 is fixedly connected to the middle beam 2-4 and the upper beam 2-1 through the left and right columns 2-2. Positioning columns 2-3 are arranged beside the left and right columns 2-2. Each connection can be connected by thread or welding. The frame is used to bear the torque and thrust during the test, and provide an installation position for the thrust-torque measuring device to be calibrated.

[0027] The torque loading mechanism is composed of a swing cylinder 15, a standard torque sensor 14, a coupling 13, a rotating platen 10, a deep groove ball bearing 11, a thrust ball bearing 12, etc. The swing cylinder 15 is installed under the base of the frame 2, and is connected to the rotating platen 10 through the standard torque sensor 14 and the coupling 13. The shaft of the rotating platen 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 pressure connecting plate 5, and a linear guide pair 7. The pressure connecting plate 5 is connected to the left and right columns of the frame 2 through the linear guide pair 7, and the standard force sensor 3 and the hydraulic cylinder 1 are connected to the pressure connecting plate 5 through the connecting ball seat 4. The hydraulic cylinder 1 is installed on the upper beam of the frame 2.

[0029] The installation and positioning mechanism is composed of an upper connecting tool 6 and a lower connecting tool 9. The upper connecting tool 6 is installed on the pressing connecting plate 5, and the lower connecting tool 9 is installed on the rotating pressing plate 10. The calibrated sensor 8 is installed between the upper connecting tool 6 and the lower connecting tool 9.

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

[0031] When the axial thrust-torque composite calibration standard device is working, 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 in the device. Since there are "cross" bosses on the upper connecting fixture 6 and the lower connecting fixture 9, after being placed in the device, the cross bosses of the upper connecting fixture 6 and the lower connecting fixture 9 fall into the "cross" grooves pressed against the connecting plate 5 and the middle beam respectively. This ensures the accurate installation of the device to be calibrated.

[0032] When the axial thrust is loaded, the axial thrust is generated by the hydraulic cylinder 1. The axial force is respectively transmitted to the standard force sensor 3, the connecting ball seat 4, the pressure connecting plate 5, the upper connecting fixture 6, and finally to the sensor to be calibrated 8. Then, it is transmitted downward to the lower connecting fixture 9 and the rotating pressure plate 10. Since the rotating pressure plate 10 is connected to the thrust ball bearing 12 and the deep groove ball bearing 11, the force is completely transmitted to the center beam and the frame 2. Therefore, in this process, the thrust will not be applied to the torque standard sensor 14. Therefore, the torque standard sensor 14 will not be affected by the axial thrust, and the mechanical decoupling of the torque standard sensor 14 and the axial thrust is realized.

[0033] When torque is loaded, torque is generated by the swing cylinder 15. The torque generated by the swing cylinder 15 is transmitted upward to the standard torque sensor 14, the coupling 13, the rotating pressure plate 10, the lower connecting tool 9 and the calibrated sensor 8 in sequence. Then, the torque continues to be transmitted upward to the upper connecting tool 6 and the pressure-directed connecting plate 5. Since the pressure-directed connecting plate 5 interacts with the column to generate a reverse torque, and the standard force sensor 3 and the pressure-directed connecting plate 5 directly use the connecting ball seat 4, the torque cannot be transmitted to the standard force sensor 3, and the torque is completely transmitted to the column. Therefore, the standard force sensor 3 will not be affected by the torque, and the mechanical decoupling of the standard force sensor 3 and the torque is achieved.

[0034] The axial thrust hydraulic cylinder 1 and the swing cylinder 15 are respectively connected to the hydraulic servo control system through oil pipes. The standard force sensor 3 and the standard torque sensor 14 are respectively connected to the reference standard instrument 16. In this case, it is an implementation example, in which the axial thrust applied by the hydraulic cylinder is 200kN and the torque applied by the swing cylinder is 200kNm. By adopting the axial thrust-torque composite calibration standard device of the present invention, the rated output maximum force value of the axial thrust-torque composite calibration standard device can be achieved to be 200kN, the force value repeatability ≤0.1%, the load fluctuation / 30min≤0.03%, and the force value stable holding time ≥30min, and the rated output maximum torque value is 200kNm, the torque repeatability ≤00.1%, the torque fluctuation / 30min≤0.03%, and the torque value stable 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 to be calibrated and apply thrust load and torque load to the sensor to be calibrated; The high-precision hydraulic load servo control system consists of a reference standard instrument, a calibrated part collection instrument, a servo hydraulic control system and a control computer. The pressure servo control system is connected to the axial thrust torque loading host, and the control computer is connected to the standard force sensor and the standard torque sensor arranged on the axial thrust torque loading host through the reference standard instrument and is connected to the calibrated sensor through the calibrated part collection instrument. The control computer is also connected to the high-precision hydraulic load servo control system.

2. The axial thrust-torque composite calibration standard device according to claim 1, characterized in that: The axial thrust torque loading main machine comprises 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 on the upper part, and the torque loading mechanism is installed on the lower part.

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

4. The axial thrust-torque composite calibration standard device according to claim 2, 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 a standard torque sensor and a coupling. The shaft of the rotating pressure plate is connected to the center beam of the frame through a deep groove ball bearing and a thrust ball bearing.

5. The axial thrust-torque composite calibration standard device according to claim 2, characterized in that: The axial thrust loading mechanism consists of a hydraulic cylinder, a standard force sensor, a connecting ball seat, a pressure connecting plate, and a linear guide pair. The pressure 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 pressure connecting plate through the connecting ball seat. The hydraulic cylinder is installed on the upper beam of the frame.

6. The axial thrust-torque composite calibration standard device according to claim 2, characterized in that: The installation and positioning mechanism consists of an upper connecting tooling and a lower connecting tooling. The upper connecting tooling is installed on the pressure connecting plate, and the lower connecting tooling is installed on the rotating pressure plate. The calibrated sensor is installed between the upper connecting tooling and the lower connecting tooling.

7. The axial thrust-torque composite calibration standard device according to claim 6, characterized in that: Both the upper connecting fixture and the lower connecting fixture are provided with "cross" bosses, and the cross bosses of the upper connecting fixture and the lower connecting fixture are respectively connected with the "cross" grooves of the pressing connecting plate and the middle beam for accurate installation of the calibrated sensor.

8. The axial thrust-torque composite calibration standard device according to claim 2, characterized in that: During operation, the hydraulic servo control system inputs hydraulic oil to the axial thrust hydraulic cylinder and the swing cylinder respectively, so that the hydraulic cylinder and the swing cylinder 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 transmitted to the control computer. The control computer controls the hydraulic servo control system to control the amount and speed of the hydraulic oil input to the axial thrust hydraulic cylinder and the swing cylinder by analyzing the deviation between the applied load and the target load, thereby achieving precise control of the applied thrust load and torque load.

9. The axial thrust-torque composite calibration standard device according to claim 8, characterized in that: When axial thrust is loaded, the axial force generated by the hydraulic cylinder is transmitted to the calibrated sensor through the standard force sensor, connecting ball seat, pressure connecting plate, and upper connecting tooling, and then transmitted downward to the lower connecting tooling and the rotating pressure plate. Under the connection between the rotating pressure plate and the thrust ball bearing and the deep groove ball bearing, the axial thrust is completely transmitted to the center beam and the frame, so that the axial thrust will not be applied to the torque standard sensor, thereby realizing the mechanical decoupling of the torque standard sensor and the axial thrust.

10. The axial thrust-torque composite calibration standard device according to claim 8, characterized in that: When torque is loaded, the torque generated by the swing cylinder is transmitted upward to the standard torque sensor, coupling, rotating pressure plate, lower connecting tooling and calibrated sensor in sequence, and then the torque continues to be transmitted upward to the upper connecting tooling and the pressure connecting plate, where the pressure connecting plate interacts with the column of the frame to generate reverse torque. The standard force sensor and the pressure connecting plate directly use a connecting ball seat, so that the torque cannot be transmitted to the standard force sensor. The torque is completely transmitted to the column of the frame, so that the standard force sensor is not affected by the torque, thereby realizing mechanical decoupling of the standard force sensor and torque.

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