CN111649853A - A micro-torque measurement device based on torque sensor - Google Patents

Abstract

The invention discloses a micro-torque measurement 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, and the front panel is provided with a pressure gauge and an air pressure regulating valve hole , the right panel is provided with air pressure quick connectors and aviation plugs, the middle of the upper panel is provided with a measuring table, which is used to fix the output shaft of the motor to be tested; the upper surface of the upper panel is also provided with a horizontal bubble, and the lower surface of the upper panel is installed with a Sleeve, aerostatic bearing, coupling, torque sensor and locking device are arranged in sequence from top to bottom in the sleeve. The top of the aerostatic bearing is connected with the measuring table, and between the aerostatic bearing and the torque sensor They are connected to each other through couplings, a top wire for fixing the torque sensor is arranged in the locking fixing device, and the bottom of the locking fixing device is fixedly connected with the bottom of the sleeve.

Description

A micro-torque measurement device based on torque sensor

technical field

The invention belongs to the field of torque measurement, in particular to a micro-torque measurement device based on a torque sensor.

Background technique

Dynamic performance parameters such as gyroscope motor reaction torque, motor disturbance torque, and fluctuating torque are important indicators to measure motor performance. At present, traditional micro-torque measurement devices are mainly based on force balance measurement method and strain measurement method. The force balance measurement method is that the measured torque is loaded on the transmission shaft, the torque device applies a counter torque to the transmission shaft according to the angle change generated by the angle sensor to make it balanced, and the measured torque can be obtained by measuring the driving current; The measuring torque is loaded on the measuring shaft of the torque sensor, and the measuring shaft is equipped with a strain gauge. The strain gauge constitutes a measuring bridge. The shear strain or shear stress generated by the torque is measured by the corresponding system, so as to obtain the output voltage change of the bridge and collect the output voltage of the sensor. The measured torque can be measured. This method is simple and intuitive, but the measurement accuracy mainly depends on the measurement accuracy of the sensor. There is a danger of overload damage during use. At the same time, it is necessary to ensure that the installation drive shaft and the measurement shaft have high coaxiality. The processing and installation are difficult, the anti-interference ability is poor, and there are great limitations in use.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a micro-torque measurement device based on a torque sensor, which is used to realize the measurement of the reaction torque of the gyroscope motor, the interference torque of the motor, and the fluctuation torque, and can realize x, y, Moment measurement in the z direction. In order to improve the torque measurement accuracy, the design scheme of fixing one end of the torque sensor is adopted, and a design invention is made for the structure of one end of the shaft of the locked sensor; the measuring table is equipped with a self-calibrating force arm, which simplifies the calibration process of torque measurement; air The hydrostatic bearing reduces the influence of external interference on the torque measurement, improves the measurement accuracy and the stability of the system; through the design, it solves the problems of the existing traditional torque sensor measurement device, which is difficult to install, easy to overload and damage, and the measurement accuracy is low. A high-precision, low-cost, and easy-to-operate micro-torque measuring device, which can be applied to various motor micro-torque measurement occasions.

The purpose of this invention is to realize through the following technical solutions:

A micro-torque measurement 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, 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 arranged in the middle of the upper panel, and the measuring table is used to fix the output shaft of the motor to be measured; the upper surface of the upper panel is also provided with a horizontal bubble, A sleeve is installed on the lower surface of the upper panel, and an aerostatic bearing, a coupling, a torque sensor and a locking fixing device are sequentially arranged in the sleeve from top to bottom. The measuring table is connected, and the aerostatic bearing and the torque sensor are connected to each other through a coupling. The locking fixing device is provided with a jack wire for fixing the torque sensor, and the bottom of the locking fixing device is connected to the sleeve. The bottom is fixedly connected; the air static pressure bearing is connected to the external air source through the air pressure quick connector, and the torque sensor is connected to the electric control case outside the case through the cable and the aviation plug, and the electric control case is connected to the electric control case. computer connection.

Further, 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.

Further, 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.

Further, the measuring platform is movably connected with a self-calibration force arm for calibrating the micro-torque measuring device.

Further, the aerostatic bearing is provided with a flange connected to the lower surface of the upper panel.

Further, a pressure regulator is provided in the chassis, and the air pressure regulating valve adopts a knob-type structure to extend out of the air pressure regulating valve hole, so as to control the air pressure of the air static pressure bearing from the outside.

Further, handles are also provided on the left panel and the right panel.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention are:

1. The micro-torque measuring device of the present invention can be used to realize the measurement of the reaction torque of the gyroscope motor, the interference torque of the motor, and the fluctuation torque, and can realize the torque measurement in the x, y, and z directions. A single torque meter can complete the radial and axial torque measurement of different types of motors.

2. In order to improve the torque measurement accuracy, the torque sensor adopts the design scheme of fixing one end, and designs and invents a locking fixing device, and makes a lockable design for the structure of the shaft at one end of the torque sensor through the locking fixing device.

3. The measuring table is equipped with a designed and invented self-calibration force arm. When the equipment is calibrated, the self-calibration force arm is suspended. After the calibration, the self-calibration force arm is removed without increasing the moment of inertia during the torque measurement process. It reduces the influence on the accuracy of the torque measuring device, makes the measurement more accurate, and greatly simplifies the calibration process of the torque device.

4. Using aerostatic bearing, the torque generated by the motor is transmitted through the aerostatic bearing, which greatly reduces the influence of interference torque such as external friction, and improves the measurement accuracy and the stability of the system.

5. In order to avoid the installation error of coaxiality in the process of coupling the torque sensor and the aerostatic bearing, which will cause the equipment to fail to return to the zero point and the deviation of the measured value is too large, an elastic coupling and a locking device are used. The design that the torque sensor bracket is all fixed on the sleeve reduces the installation difficulty of the coaxiality of the micro-torque measurement device, and the installation coaxiality can be debugged only by adjusting the position of either end. The elastic coupling can compensate radial, axial deviation and angular displacement, which is convenient for the guarantee of coaxiality.

6. The micro-torque measurement device based on the torque sensor is designed by fixing one end of the torque sensor, and the aerostatic bearing, elastic coupling and the designed and invented locking device are all fixed on the sleeve, which greatly improves the measurement accuracy of the system. and stability, the measurement accuracy of the selected torque sensor has been greatly improved from 1.5 × 10 ^-5 N·m to 2 × 10 ^{- 6} N·m, which is an order of magnitude improved, and the measurement accuracy of the torque sensor used in the field is improved. .

7. The locking fixture adopts interference fit and top wire design. The top wire is calculated and designed by the top fixing torque. When an overload torque is applied, the top wire fails, and the torque sensor is protected from overload damage; compared with the traditional measuring device, it is difficult to install , easy overload damage, low measurement accuracy and other problems, the torque measurement device of the present invention has the advantages of high precision, low cost, easy operation, safety and reliability.

Description of drawings

FIG. 1 is an assembly diagram of the micro-torque measuring device of the present invention.

FIG. 2 is a schematic diagram of the internal structure of the micro-torque measuring device of the present invention.

FIG. 3 is a schematic diagram of the connection state of the micro-torque measuring device of the present invention.

4 is a schematic structural diagram of the measuring table and the self-calibrating force arm of the micro-torque measuring device of the present invention.

FIG. 5 is a schematic structural diagram of the locking and fixing device in the micro-torque measuring device of the present invention.

Detailed ways

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

As shown in FIG. 1 , the present invention provides a micro-torque measurement device based on a torque sensor, including a cubic case 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. The measuring table 6 is installed in the middle of the panel 1, and the gyroscope motor to be tested is inserted into the measuring table 6 using the extension shaft tooling, and the tooling is fixed on the measuring table by tightening screws, and the self-calibration force arm 29 can be suspended in and out of the measuring table 6. Calibration of the moment measuring device; upper panel 1, lower panel 2, left panel 3, right panel 4 are fixed by countersunk head screws 13, front panel 5 and rear panel are installed by sliding in, simplifying installation unrelated to measurement; upper panel A leveling bubble 12 is installed on the 1, which is convenient to adjust the level of the measuring device; the handles 8 on the left panel and the right panel are fixed by the fastening screws on the inner side of the panel; the front panel 5 is fixed with a pressure gauge shell 7 by screws, and the pressure gauge is installed in the On the pressure gauge shell 7; the internal air static pressure bearing 14 is connected to the external air source 26 by the air-filled joint 15 and the air pressure quick joint 10, the chassis has a built-in pressure regulator, and the air pressure regulating valve 9 in the chassis adopts a protruding knob structure. The external control of the air pressure of the aerostatic bearing is realized; the signal of the torque sensor 20 is transmitted to the computer through the cable through the aviation plug 11 installed on the right panel 4, and each part is checked for reliable fixing. After inflating the aerostatic bearing 14, start Measurement.

Specifically, in this embodiment, the sleeve is designed as a cylinder, and the side of the cylinder has a cut surface window treatment, which is semi-open, which ensures the strength and also ensures that the inside of the sleeve can be adjusted and observed. The connecting pipe connecting the air static pressure bearing with the external air source 26 is inserted through a window located on the side of the sleeve. The front panel 5 is provided with an air pressure regulating valve hole, and the air pressure is adjusted through the air pressure regulating valve 9 extending out of the air pressure regulating valve hole. adjust.

The internal structure of the micro-torque measuring device in this embodiment is shown in Figures 2 to 5. The measuring table 6 is connected to the upper end face of the aerostatic bearing 14 by tightening screws; The fixing screw 16 fixes the flange plate and the lower end face of the upper panel 1; the lower end of the aerostatic bearing 14 is connected with the shaft of the torque sensor 20 through the elastic coupling 17, and the elastic coupling 17 compensates the radial, angular and Axial deviation; the torque sensor 20 is fixed on the sensor bracket 21 by the tightening screw 22, and the sensor bracket 21 is connected with the lower end of the sleeve 18, and the influence of gravity of the torque sensor 14 itself is decomposed on the bottom screw 25 to reduce the influence on the torque measurement. The lower shaft of the torque sensor 20 is inserted into the lower end locking fixing device 23, and the two adopt interference fit to ensure the coaxiality and at the same time make the lower shaft of the torque sensor 20 inconvenient for relative rotation. It is convenient for the sensor to measure the strain; the locking fixture 23 is fixed on the lower end of the sleeve 18 by the tightening screw 25; the sleeve 18 is fixed on the lower end surface of the upper panel 1 by the tightening screw 19; 15; At this point, the torque measuring device is installed.

The connection diagram of the micro-measurement device in this embodiment is shown in Figure 3. The cable is used to connect the device to the electric control box 27, and the electric control box 27 is connected to the upper computer 28. After checking that each part is fixed and reliable, use the external air source 26 to connect the air After the hydrostatic bearing 14 is inflated, the measurement is started. The torque sensor is connected to the electronic control box 27 through the cable and the aviation plug, and the electronic control box 27 is connected to the computer 28. After checking that each part is fixed and reliable, use the external air source 26 to inflate the air static pressure bearing 14, and start the measurement.

For the micro-torque measurement 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 deviation and angular displacement, which is convenient to ensure the coaxiality; the locking fixing device 23 and the sensor bracket 21 is all fixed on the sleeve 18. The sleeve 18 is installed on the lower end face of the upper panel 1, which reduces the installation difficulty of the coaxiality of the torque measuring device. It cooperates with the elastic coupling 17 and can only be adjusted by adjusting the position of either end. Realize the debugging of the coaxiality of the installation; the locking fixture 23 is designed with interference fit and the top wire 24. The top wire 24 is calculated and designed by the top fixing torque. When an overload torque is applied, the top wire 24 fails, and the torque sensor 20 is protected from overload. Compared with the traditional measuring device, which is difficult to install, easy to overload and damage, and low in measurement accuracy, a high-precision, low-cost, easy-to-operate, safe and reliable micro-torque measuring device is provided.

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 solutions of the present invention, and the above-mentioned specific embodiments are only illustrative and not restrictive. Without departing from the spirit of the present invention and the protection scope of the claims, those of ordinary skill in the art can also make many specific transformations under the inspiration of the present invention, which all fall within the protection scope of the present invention.

Claims (7)

1. A micro-torque measuring device based on a torque sensor is characterized by 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 the front panel is provided with a pressure gauge and an air pressure adjusting valve hole, the right panel is provided with an air pressure quick joint and an aviation plug, the middle part of the upper panel is provided with a measuring table, and the measuring table is used for fixing an output shaft of a motor to be measured; the upper surface of the upper panel is also provided with a horizontal bubble, the lower surface of the upper panel is provided with a sleeve, the sleeve is internally provided with an air hydrostatic bearing, a coupler, a torque sensor and a locking fixing device which are sequentially connected, the top end of the air hydrostatic bearing is connected with a measuring table, the air hydrostatic bearing and the torque sensor are mutually connected through the coupler, the locking fixing device is internally provided with a jackscrew for fixing the torque sensor, and the bottom of the locking fixing device is fixedly connected with the bottom of the sleeve; the air hydrostatic bearing is connected with an external air source through the air pressure quick connector, the torque sensor is connected with an electric control case outside the case through a cable and the aviation plug, and the electric control case is connected with a computer.

2. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein the upper panel and the lower panel are fixed with the left panel and the right panel by screws, and the front panel and the rear panel are installed in a sliding manner to form the case.

3. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein the torque sensor is fixed by a sensor bracket, and the bottom of the sensor bracket is fixedly connected with the bottom of the sleeve.

4. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein the measurement platform is movably connected with a self-calibration arm lever for calibrating the micro-torque measurement device.

5. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein the aerostatic bearing is provided with a flange connected to a lower surface of the upper panel.

6. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein a pressure regulator is arranged in the case, and the air pressure regulating valve extends out of the air pressure regulating valve hole by adopting a knob extending structure, so that the air pressure of the air hydrostatic bearing is controlled from the outside.

7. The micro-torque measurement device based on the torque sensor as claimed in claim 1, wherein the left and right panels are further provided with handles.

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