A micro torque measurement device based on torque sensor

Abstract

The invention discloses a micro-torque measuring device based on a torque sensor, comprising a cubic case consisting of an upper panel, a lower panel, a left panel, a right panel, a front panel and a rear panel, wherein a pressure gauge and an air pressure regulating valve hole are arranged on the front panel, an air pressure quick connector and an aviation plug are arranged on the right panel, a measuring platform is arranged in the middle of the upper panel, and the measuring platform is used to fix the output shaft of a motor to be measured; a level bubble is also arranged on the upper surface of the upper panel, a sleeve is installed on the lower surface of the upper panel, an air static pressure bearing, a coupling, a torque sensor and a locking fixture are arranged in the sleeve from top to bottom in sequence, the top end of the air static pressure bearing is connected to the measuring platform, the air static pressure bearing and the torque sensor are connected to each other through a coupling, a top screw for fixing the torque sensor is arranged in the locking fixture, and the bottom of the locking fixture is fixedly connected to the bottom of the sleeve.

Description

Technical Field

[0001] The invention belongs to the field of torque measurement, in particular to a micro torque measurement device based on a torque sensor. Background Art

[0002] Dynamic performance parameters such as the reaction torque of the gyroscope motor, the motor interference torque, and the ripple torque are important indicators for measuring the performance of the motor. At present, the traditional micro-torque measurement device is mainly based on the force balance measurement method and the strain measurement method. The force balance measurement method is that the measured torque is loaded on the transmission shaft, and the torque meter applies the counter torque to the transmission shaft according to the angle change generated by the angle sensor to balance it. The measured torque can be obtained by measuring the driving current; the strain measurement method is that the measured torque is loaded on the measurement shaft of the torque sensor, and the measurement shaft is equipped with a strain gauge, which forms a measuring bridge. The shear strain or shear stress generated by the torque is measured by the corresponding system, so as to obtain the change of the bridge output voltage. The measured torque can be measured by collecting the sensor output voltage. This method is simple and intuitive, but the measurement accuracy mainly depends on the measurement accuracy of the sensor. There is a risk of overload damage during use. At the same time, it is necessary to ensure that the transmission shaft and the measuring shaft have a high coaxiality. The processing and installation are difficult, the anti-interference ability is poor, and there are great limitations when using it. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a micro-torque measuring device based on a torque sensor, which is used to measure the reaction torque of the gyroscope motor, the motor interference torque, and the ripple torque, and can measure the torque in the x, y, and z directions. In order to improve the torque measurement accuracy, a design scheme of fixing one end of the torque sensor is adopted, and a design invention is made for the structure of the shaft at one end of the locking sensor; the measuring table is equipped with a self-calibrating lever arm to simplify the calibration process of the torque measurement; an air static pressure bearing is used to reduce the influence of external interference on the torque measurement, and improve the measurement accuracy and system stability; the design solves the problems of the existing traditional torque sensor measuring device being difficult to install, easy to be damaged by overload, and low measurement accuracy, and provides a high-precision, low-cost, easy-to-operate micro-torque measuring device, which can be promoted for a variety of motor micro-torque measurement occasions.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A micro torque measuring device based on a torque sensor comprises a cubic case consisting of an upper panel, a lower panel, a left panel, a right panel, a front panel and a rear panel, wherein a pressure gauge and an air pressure regulating valve hole are arranged on the front panel, an air pressure quick connector and an aviation plug are arranged on the right panel, a measuring platform is arranged in the middle of the upper panel, and the measuring platform is used to fix the output shaft of the motor to be measured; a level bubble is also arranged on the upper surface of the upper panel, a sleeve is installed on the lower surface of the upper panel, and an air static pressure bearing, a coupling, a torque sensor and a locking fixture are arranged in the sleeve from top to bottom in sequence, the top of the air static pressure bearing is connected to the measuring platform, the air static pressure bearing and the torque sensor are connected to each other through the coupling, a top screw for fixing the torque sensor is arranged in the locking fixture, and the bottom of the locking fixture is fixedly connected to the bottom of the sleeve; the air static pressure bearing is connected to an external air source through the air pressure quick connector, the torque sensor is connected to an electric control case located outside the case through a cable and the aviation plug, and the electric control case is connected to a computer.

[0006] Furthermore, the upper panel, the lower panel, the left panel and the right panel are fixed by screws, and the front panel and the rear panel are installed in a sliding manner to form the chassis.

[0007] Furthermore, the torque sensor is fixed by a sensor bracket, and the bottom of the sensor bracket is fixedly connected to the bottom of the sleeve.

[0008] Furthermore, the measuring platform is movably connected with a self-calibration lever arm for calibrating the micro-torque measuring device.

[0009] Furthermore, the air static pressure bearing is provided with a flange connected to the lower surface of the upper panel.

[0010] Furthermore, a pressure regulator is provided in the chassis, and the air pressure regulating valve extends out of the air pressure regulating valve hole using an extending knob structure, so as to control the air pressure of the air static pressure bearing from the outside.

[0011] Furthermore, the left panel and the right panel are provided with handles.

[0012] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0013] 1. The micro torque measuring device of the present invention can be used to measure the reaction torque of the gyroscope motor, the interference torque of the motor, and the ripple torque, and can measure the torque in the x, y, and z directions. One torque meter can complete the radial and axial torque measurement of motors of different models.

[0014] 2. In order to improve the torque measurement accuracy, the torque sensor is designed with one end fixed, and a locking fixture is designed and invented. The structure of the shaft at one end of the torque sensor is made to be lockable through the locking fixture.

[0015] 3. The measuring table is equipped with a self-calibration lever arm designed and invented. When calibrating the equipment, the self-calibration lever arm is suspended in and removed after the calibration. The moment of inertia during the torque measurement process is not increased, the influence on the accuracy of the torque measurement device is reduced, the measurement is more accurate, and the calibration process of the torque device is greatly simplified.

[0016] 4. The air static pressure bearing is used to transmit the torque generated by the motor through the air static pressure bearing, which greatly reduces the influence of interference torque such as external friction and improves the measurement accuracy and system stability.

[0017] 5. In order to avoid the coaxiality installation error in the process of connecting the torque sensor and the air static pressure bearing through the coupling, which causes the equipment to be unable to return to the zero point and the measurement value deviation to be too large, the design of fixing the elastic coupling, the locking fixture and the torque sensor bracket on the sleeve reduces the difficulty of installing the coaxiality of the micro-torque measuring device, and the installation coaxiality can be debugged by adjusting the position of any end. The elastic coupling can compensate for radial, axial deviation and angular displacement, which is convenient for ensuring coaxiality.

[0018] 6. The micro torque measurement device based on the torque sensor is designed to fix one end of the torque sensor, and the air static pressure bearing, elastic coupling and the invented locking fixture are all fixed on the sleeve, which greatly improves the measurement accuracy and stability of the system, and increases the measurement accuracy of the selected torque sensor from 1.5×10 -5 N·m has been greatly improved to 2×10 - 6 N·m, which is an order of magnitude higher and improves the micro-torque measurement accuracy of torque sensors in the field.

[0019] 7. The locking fixing device adopts interference fit and top screw design. The top screw is designed through top fixing torque calculation. When overload torque is applied, the top screw fails, thus protecting the torque sensor from overload damage. Compared with traditional measuring devices that are difficult to install, easy to be damaged by overload, and have low measurement accuracy, the torque measuring device of the present invention has the advantages of high precision, low cost, easy operation, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an assembly drawing of the micro-torque measuring device of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the micro-torque measurement device of the present invention.

[0022] Figure 3 It is a schematic diagram of the connection state of the micro-torque measuring device of the present invention.

[0023] Figure 4 The present invention is a schematic diagram of the structure of a measuring platform and a self-calibrating lever arm of a micro-torque measuring device.

[0024] Figure 5 It is a structural schematic diagram of the locking and fixing device in the micro-torque measuring device of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] like Figure 1 As shown, the present invention provides a micro torque measuring device based on a torque sensor, comprising a cubic chassis consisting of an upper panel 1, a lower panel 2, a left panel 3, a right panel 4, a front panel 5 and a rear panel, a measuring table 6 is installed in the middle of the upper panel 1, and the gyroscope motor to be measured is inserted into the measuring table 6 using an extended shaft tooling, the tooling is fixed on the measuring table by fastening screws, and a self-calibration force arm rod 29 can be suspended in and out of the measuring table 6 to realize calibration of the torque measuring device; the upper panel 1, the lower panel 2 and the left panel 3 and the right panel 4 are fixed by countersunk screws 13, and the front panel 5 and the rear panel are installed in a sliding manner to simplify the installation that is not related to the measurement; a level bubble 12 is installed on the upper panel 1, It is convenient to adjust the level of the measuring device; the handles 8 on the left and right panels are fixed by the fastening screws on the inside of the panels; the pressure gauge housing 7 is fixed to the front panel 5 by screws, and the pressure gauge is installed on the pressure gauge housing 7; the internal air static pressure bearing 14 is connected to the external air source 26 by an inflation joint 15 and an air pressure quick joint 10, and the chassis has a built-in pressure regulator. The air pressure regulating valve 9 in the chassis adopts an extended knob structure to control the air pressure of the air static pressure bearing from the outside; the torque sensor 20 signal is transmitted to the computer for processing via a cable through the aviation plug 11 installed on the right panel 4, and each part is checked to be reliably fixed. After the air static pressure bearing 14 is inflated, the measurement is started.

[0027] Specifically, in this embodiment, the sleeve is designed as a cylinder, and the side of the cylinder has a cut-out window treatment, which is semi-open, ensuring strength while ensuring adjustment and observation inside the sleeve. The connecting pipe connecting the air static pressure bearing and the external air source 26 is inserted from a window located on the side of the sleeve, and an air pressure regulating valve hole is provided on the front panel 5, and the air pressure is adjusted by an air pressure regulating valve 9 extending out of the air pressure regulating valve hole.

[0028] The internal structure of the micro-torque measurement device in this embodiment is as follows: Figures 2 to 5As shown, the measuring platform 6 is connected to the upper end surface of the air static pressure bearing 14 by fastening screws; a flange is installed on the air static pressure bearing 14, and the flange is fixed to the lower end surface of the upper panel 1 by fastening screws 16; the lower end of the air static pressure bearing 14 is connected to the axis of the torque sensor 20 through an elastic coupling 17, and the elastic coupling 17 elastically compensates for radial, angular and axial deviations; the torque sensor 20 is fixed to the sensor bracket 21 by fastening screws 22, and the sensor bracket 21 is connected to the lower end of the sleeve 18, so as to decompose the influence of the gravity of the torque sensor 14 itself into the bottom screw The lower shaft of the torque sensor 20 is inserted into the lower end locking fixture 23, and the two are fitted with interference fit to ensure coaxiality while preventing the lower shaft of the torque sensor 20 from relative rotation. The lower shaft of the torque sensor 20 is fixed by the top screw 24 to facilitate the sensor to measure strain; the locking fixture 23 is fixed to the lower end of the sleeve 18 by the fastening screw 25; the sleeve 18 is fixed to the lower end surface of the upper panel 1 by the fastening screw 19; the air pipe is inserted into the air static pressure bearing inflation joint 15; at this time, the torque measurement device is installed.

[0029] The connection diagram of the micro-measurement device in this embodiment is as follows Figure 3 As shown, the cable connection device is connected to the electric control box 27, the electric control box 27 is connected to the host computer 28, and after checking that each part is fixed reliably, the air static pressure bearing 14 is inflated using the external air source 26, and then the measurement is started. The torque sensor is connected to the electric control box 27 through a cable and an aviation plug, and the electric control box 27 is connected to the computer 28. After checking that each part is fixed reliably, the air static pressure bearing 14 is inflated using the external air source 26, and then the measurement is started.

[0030] For the micro-torque measuring device based on the torque sensor 20, the structure is relatively simple and the installation is convenient. The elastic coupling 17 can compensate for radial, axial deviations and angular displacements, which is convenient for ensuring coaxiality. The locking fixture 23 and the sensor bracket 21 are all fixed on the sleeve 18. The sleeve 18 is installed on the lower end surface of the upper panel 1, which reduces the difficulty of installing the coaxiality of the torque measuring device. In conjunction with the elastic coupling 17, the installation coaxiality can be debugged by adjusting the position of any one end. The locking fixture 23 adopts an interference fit and a top screw 24 design. The top screw 24 is designed by calculating the fixing torque. When an overload torque is applied, the top screw 24 fails, protecting the torque sensor 20 from overload damage. Compared with the traditional measuring devices that are difficult to install, easy to be damaged by overload, and have low measurement accuracy, a high-precision, low-cost, easy-to-operate, safe and reliable micro-torque measuring device is provided.

[0031] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, a person of ordinary skill in the art can also make many forms of specific changes under the guidance of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A micro torque measurement device based on a torque sensor, characterized in that: The invention comprises a cubic case consisting of an upper panel, a lower panel, a left panel, a right panel, a front panel and a rear panel, wherein the front panel is provided with a pressure gauge and an air pressure regulating valve hole, the right panel is provided with an air pressure quick connector and an aviation plug, a measuring table is provided in the middle of the upper panel, and the measuring table is used to fix the output shaft of the motor to be tested; a level bubble is also provided on the upper surface of the upper panel, a sleeve is installed on the lower surface of the upper panel, and an air static pressure bearing, a coupling, a torque sensor and a locking fixing device connected in sequence are provided in the sleeve, the top end of the air static pressure bearing is connected to the measuring table, and the air static pressure bearing and the torque sensor are connected to each other through a coupling , a top screw for fixing the torque sensor is arranged in the locking fixture, and the bottom of the locking fixture is fixedly connected to the bottom of the sleeve; the air static pressure bearing is connected to the external air source through the air pressure quick connector, the torque sensor is connected to the electric control chassis outside the chassis through the cable and the aviation plug, and the electric control chassis is connected to the computer; the measuring platform is movably connected with a self-calibration lever arm for calibrating the micro-torque measuring device, the self-calibration lever arm is suspended when calibrating the equipment, and the self-calibration lever arm is removed after the calibration is completed, which does not increase the moment of inertia during the torque measurement process, reduces the influence on the accuracy of the torque measurement device, and simplifies the calibration process; The torque measuring device can measure the reaction torque of the gyroscope motor, the motor interference torque, and the ripple torque, and can measure the torque in the x, y, and z directions. One torque meter can measure the radial and axial torque of motors of different models. The air static pressure bearing is provided with a flange connected to the lower surface of the upper panel; the torque generated by the motor is transmitted through the air static pressure bearing; The setting of the coupling and the locking fixture can realize the debugging of the installation coaxiality by adjusting the position of any end; the coupling can compensate for radial, axial deviation and angular displacement; the coupling adopts elastic coupling; The micro torque measuring device fixes one end of the torque sensor, and the air static pressure bearing, coupling and locking fixture are all fixed on the sleeve, and the measurement accuracy of the torque sensor is increased from 1.5×10 -5 N·m increased to 2×10 -6 N·m; The locking fixing device adopts interference fit and top screw design. The top screw is designed through top fixing torque calculation. When overload torque is applied, the top screw fails to protect the torque sensor from overload damage.

2. According to claim 1, a micro torque measurement device based on a torque sensor is characterized in that: The upper panel, the lower panel, the left panel and the right panel are fixed by screws, and the front panel and the rear panel are installed in a sliding manner to form the chassis.

3. According to claim 1, a micro torque measurement device based on a torque sensor is characterized in that: The torque sensor is fixed by a sensor bracket, and the bottom of the sensor bracket is fixedly connected to the bottom of the sleeve.

4. The micro torque measurement device based on a torque sensor according to claim 1, characterized in that: A pressure regulator is arranged in the chassis, and an air pressure regulating valve extends out of the air pressure regulating valve hole by adopting an extending knob structure, so as to control the air pressure of the air static pressure bearing from the outside.

5. The micro torque measuring device based on torque sensor according to claim 1, characterized in that: The left panel and the right panel are also provided with handles.

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