CN109282927B - A shaft torque measurement system and measurement method - Google Patents

Abstract

The invention discloses a shaft torque measurement system and a measurement method, which include a first magnetic grid, a second magnetic grid, a first sensing component, a second sensing component and a processor, the first magnetic grid and the second magnetic grid It is arranged at intervals on the surface of the shaft to be measured, and has a first seam and a second seam respectively. The first sensing component includes two first sensing parts facing the first magnetic grid along the radial direction of the shaft to be measured. , the second sensing assembly includes two second sensing parts facing the second magnetic grid along the radial direction of the axis to be measured, the two first sensing parts and the two first sensing parts respectively sense the The first magnetic grid and the second magnetic grid to be measured shaft rotation, and respectively generate the first sensing signal and the second sensing signal, the processor receives and processes the first sensing signal and the second sensing signal, to obtain the Measure shaft torque. The shaft torque measurement system and measurement method of the present invention can not only measure the torque of shafts to be measured with different diameters, but also have high resolution and high accuracy of measurement results.

Description

A shaft torque measurement system and measurement method

technical field

The invention relates to the field of shaft torque measurement, in particular to a shaft torque measurement system and a measurement method.

Background technique

In the mechanical transmission system, torque is one of the most typical mechanical quantities that reflect the performance of the production equipment system. The measurement and analysis of torque is also an important means to ensure the normal operation of various production equipment and auxiliary equipment, reduce energy consumption and improve efficiency. Therefore Improving the accuracy of torque measurement, the real-time performance of torque monitoring and control, and the reliability of torque anomaly analysis will certainly reduce the occurrence of accidents and improve the utilization rate of production equipment. In other words, the on-line monitoring of torque is of great significance to the reduction of unplanned maintenance time and the reduction of accident rate, the efficiency of analyzing the cause of accidents or failures, and the improvement of production efficiency and economic benefits.

With the advancement of science and technology and the development of production, torque measurement technology has more and more broad application prospects. Modern mechanical products are developing in the direction of high power, high speed, and miniaturization. It is particularly important to monitor the operating status of various power machinery and identify and predict faults, especially large, critical, and unreserved mechanical equipment. For example, heavy-duty long-distance trucks, high-power underwater structures, main shafts of ships, etc. When the corresponding frequency of the control system is close to or equal to the natural frequency of the transmission shaft system, it will cause electromechanical coupling and resonance, and the current oscillation will have a serious impact on the operation of mechanical equipment, thereby delaying the operation plan and causing losses.

For example, with the development of large-scale, high-speed and automatic ships, the rapidity, high efficiency, and economy of ships have become important indicators for shipbuilding. As an important means of calculating conversion efficiency, the shaft power Measurement is the main parameter for shipyards and shipowners to accept new ships. The operating conditions of the ship are very complicated. The matching of ship-engine-propeller has a great influence on the performance of the main engine. Power operation, resulting in overload use of the host, greatly shortening the service life. The shaft power and torque measurement system of the ship, through the measurement of the shaft power of the main engine under different working conditions, can understand and detect the matching between the hull-main engine-propeller, and monitor the operating status of the hull in real time. It can also diagnose the working status and faults of the old ship-engine-propeller. As one of the most important performance parameters of the main engine of a ship, the shaft power is generally calculated through indirect measurement of torque and speed, and then the output power is compared with the fuel consumption to avoid excessive use of the engine. In this way, not only can the ship maintain or A reasonable increase in speed can also save a lot of fuel and reduce emissions of carbon dioxide and nitrogen oxides.

As for the measurement of shaft power, its development trend is from static test to dynamic test, from contact measurement to non-contact measurement. The direction of intelligence and real-time monitoring is developing. At the same time, the requirements for measurement accuracy, accuracy and resolution are constantly improving with market demand.

With the most widely used shaft power measurement system "KONGSBERG shaft power meter The photoelectric non-contact rotating shaft torque measurement system represented by "system" is a shaft power measurement system based on phase difference. The system mainly uses photoelectric switch sensors, including photoelectric switches, photoelectric encoders, controllers, computers and related circuits. , the code wheel is fixedly installed on the rotating shaft, the notch of the photoelectric switch is facing the code wheel, and is fixed on the edge of the code wheel, when the code wheel rotates with the measured shaft, the photoelectric switch between the photodetector and the light-emitting diode The optical path between them is periodically opened or closed, the photoelectric switch outputs pulses with the same period of opening and closing, and the controller processes the electrical signal transmitted by the photoelectric switch to obtain a real phase difference signal and store the phase difference signal in In the data unit, it is then transmitted to the single-chip microcomputer, and the single-chip microcomputer calculates the torque and shaft power of the rotating shaft based on the measured speed value, and then the computer performs mathematical statistics and data analysis on the values in the controller, and displays them in the form of charts.

At present, the shaft torque measurement system based on photoelectric technology depends on the accurate installation of the reading head to a certain extent, so the installation requirements are high when it is used. The installer needs to have sufficient experience, and the installation is quite difficult. , at the same time, its performance in terms of resolution and sensitivity is gradually unable to meet the actual use requirements.

Contents of the invention

Embodiments of the present invention provide a shaft torque measurement system and a measurement method to solve the problems of low resolution, low sensitivity and high installation difficulty of the existing shaft torque measurement system.

In order to solve the above technical problems, the present invention provides a shaft torque measurement system, which includes a first magnetic grid, a second magnetic grid, a first sensing component, a second sensing component and a processor, the first magnetic grid and the second The magnetic grating is arranged on the surface of the shaft to be measured at intervals, and has a first joint and a second joint respectively, and the first sensing component and the second sensing component respectively have two first sensing parts and two second sensing parts. Sensing parts, two first sensing parts are arranged at intervals, and respectively face the first magnetic grid along the radial direction of the shaft to be measured, and the two first sensing parts sense the first magnetic grid that rotates with the shaft to be measured. grid to generate the first sensing signal, the two second sensing parts are arranged at intervals, and respectively face the second magnetic grid along the radial direction of the axis to be measured, the two second sensing parts sense the The second magnetic grating rotates to generate a second sensing signal, and the processor receives and processes the first sensing signal and the second sensing signal to obtain the torque of the shaft to be measured.

According to an embodiment of the present invention, the two first sensing parts and the two second sensing parts respectively have magnetic heads, the magnetic head of each first sensing part faces the first magnetic grid, and each second sensing part The second magnetic grid of the magnetic head.

According to an embodiment of the present invention, the thickness of the first magnetic grid and the second magnetic grid is between 1.0 mm and 1.5 mm, and the air gap between the first sensing part and the first magnetic grid and the second sensing part The air gap between the measuring part and the second magnetic grid is between 0.5mm and 1.5mm.

According to an embodiment of the present invention, each of the above-mentioned first sensing parts and each of the second sensing parts respectively has an MR sensor and two Hall sensors, and the two Hall sensors are symmetrically arranged on both sides of the MR sensor, and The MR sensor of the first sensing part and the two Hall sensors are arranged along the radial direction of the axis to be measured and facing the first magnetic grid, and the MR sensor of each second sensing part and the two Hall sensors are arranged along the radial direction of the axis to be measured. The radial direction of the measurement axis is arranged and faces the second magnetic grid, wherein the first sensing component receives the two first sensing parts alternately through the first analog signal generated by the two Hall sensors of each first sensing part The first sensing signal generated by one of the MR sensors, wherein the second sensing component alternately receives two second sensing components through the second analog signal generated by the two Hall sensors of each second sensing part The second sensing signal generated by the MR sensor of one of the parts.

According to an embodiment of the present invention, the above-mentioned processor integrates the first sensing signals generated by the MR sensors of the two first sensing parts alternately received as the first sensing signal, and the processor integrates the two alternately received The second sensing signal generated by the MR sensor of the second sensing part is the second sensing signal, and the processor obtains the torque of the shaft to be measured according to the first sensing signal and the second sensing signal.

According to an embodiment of the present invention, the distance between the Hall sensor and the MR sensor in the two first sensing parts is greater than the magnetic pole pitch of the first magnetic grid, and the Hall sensor and the MR sensor in each second sensing part The distance between the MR sensors is greater than the magnetic pole pitch of the second magnetic grid.

According to an embodiment of the present invention, it also includes a display module, the processor obtains the measurement result according to the first sensing signal and the second sensing signal, and generates a display signal according to the measurement result, and transmits the display signal to the display module, and the display module according to The display signal shows the torque of the shaft to be measured.

According to an embodiment of the present invention, a magnetic grid protective layer is further included, and the magnetic grid protective layer is disposed on surfaces of the first magnetic grid and the second magnetic grid away from the axis to be measured.

A shaft torque measurement method using the above-mentioned shaft torque measurement system, which includes the steps of: installing a first magnetic grid and a second magnetic grid on the surface of the shaft to be measured, and installing a first magnetic grid corresponding to the first magnetic grid and the second magnetic grid. The sensing component and the second sensing component drive the shaft to be measured to rotate. The first sensing component and the second sensing component respectively induce the first magnetic grid and the second magnetic grid that rotate with the shaft to be measured, and generate the first magnetic grid respectively. A sensing signal and a second sensing signal. The processor processes the first sensing signal and the second sensing signal to obtain the torque of the shaft to be measured.

According to an embodiment of the present invention, in the step of respectively sensing the first magnetic grating rotating with the axis to be measured by the two first sensing parts and generating the first sensing signal, one of the two first sensing parts is selected Or, the MR sensor of the selected first sensing part senses the first magnetic grating rotating with the axis to be measured, and generates a first sensing signal; the Hall sensor of the selected first sensing part senses The first joint produces a discontinuous first analog signal, and the MR sensor switched to another first sensing part senses the first magnetic grating rotating with the axis to be measured, and generates another first sensing signal, the two second sensing parts respectively sense the second magnetic grating rotating with the shaft to be measured and generate the second sensing signal, one of the two second sensing parts is selected, and the selected second The MR sensor of the sensing part senses the second magnetic grating rotating with the shaft to be measured, and generates a second sensing signal; the Hall sensor of the selected second sensing part senses the second seam and generates a different The continuous second analog signal is switched to the MR sensor of another second sensing part to sense the second magnetic grating rotating with the axis to be measured, and generate another second sensing signal.

In the embodiment of the present invention, in the shaft torque measurement system and measurement method of the present invention, the first magnetic grating with the first seam and the second magnetic grating with the second seam are spaced apart on the surface of the shaft to be measured , the shaft to be measured rotates and drives the first magnetic grid and the second magnetic grid, the first sensing component senses the rotating first magnetic grid and outputs the first sensing signal, and the second sensing component senses the rotating The second magnetic grid performs sensing and outputs a second sensing signal, and then the processor receives and processes the first sensing signal and the second sensing signal to obtain the torque of the shaft to be measured. Torque measurement of the shaft to be measured can also improve the accuracy of torque measurement and obtain measurement results with higher reliability.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiment of the present invention and its description are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the block diagram of shaft torque measurement system of the present invention;

Fig. 2 is the installation schematic diagram of shaft torque measuring system of the present invention;

3 is a block diagram of the first sensing assembly of the shaft torque measurement system of the present invention;

Fig. 4 is a schematic diagram of sensing the first magnetic grid by the first sensing component of the shaft torque measurement system of the present invention;

FIG. 5 is an enlarged view of area A in FIG. 4 .

Detailed ways

The technical solutions in this embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in this embodiment of the present invention. Obviously, the described embodiment is an embodiment of the present invention, not all of the present invention. implementation. Based on this implementation manner in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Please refer to FIG. 1 and FIG. 2, which are respectively a block diagram and an installation diagram of the shaft torque measurement system of the present invention. As shown in the figure, the shaft torque measurement system 1 provided by this embodiment includes a first magnetic grid 10, a second magnetic grid 11, a first sensing component 12, a second sensing component 13 and a processor 14, wherein the first A magnetic grid 10 and a second magnetic grid 11 are arranged on the surface of the shaft 2 to be measured at intervals, the first magnetic grid 10 and the second magnetic grid 11 surround the shaft 2 to be measured respectively, and there is a gap between the two ends of the first magnetic grid 10 . There is a second seam 111 between the two ends of the first seam 101 and the second magnetic grid 11. The width of the first seam 101 and the second seam 111 is based on the circumference of the shaft 2 to be measured and the first magnetic grid 10. and the length of the second magnetic grid 11, that is, the width of the first joint 101 and the second joint 111 is the circumference length of the shaft 2 to be measured and subtracted from the first magnetic grid 10 and the second magnetic grid 11 respectively.

The first sensing assembly 12 has two first sensing parts 120, and the two first sensing parts 120 are arranged at intervals along the radial direction of the shaft 2 to be measured, and their sensing directions are respectively along the radial direction of the shaft 2 to be measured. The radial direction is towards the first magnetic grid 10 . The second sensing assembly 13 has two second sensing parts 130, and the two second sensing parts 130 are arranged at intervals along the radial direction of the shaft 2 to be measured, and their sensing directions are respectively along the radial direction of the shaft 2 to be measured. The radial direction is towards the second magnetic grid 11 . The first sensing component 12 and the second sensing component 13 are electrically connected to the processor 14 respectively.

When the shaft 2 to be measured rotates, it drives the first magnetic grid 10 and the second magnetic grid 11 to rotate, and the two first sensing parts 120 of the first sensor assembly 12 respectively sense the rotating first magnetic grid 1 to generate first sensing signal. At the same time, the two second sensing parts 130 of the second sensing assembly 13 respectively sense the rotating second magnetic grid 11 to generate a second sensing signal. The first sensing component 12 and the second sensing component 13 respectively transmit the first sensing signal and the second sensing signal to the processor 14, and the processor 14 processes the received first sensing signal and the second sensing signal , and obtain the torque of shaft 2 to be measured.

Please continue to refer to FIG. 3 , which is a block diagram of the first sensing component of the shaft torque measurement system of the present invention. As shown in the figure, in this embodiment, each first sensing part 120 of the first sensing component 12 has an MR sensor and two Hall sensors, and the two Hall sensors are symmetrically arranged on both sides of the MR sensor. Each first sensing part 120 has a magnetic head, and the magnetic head of each first sensing part 120 faces the first magnetic grating 10 respectively, so as to sense the first magnetic grating 10, and each Hall sensor and the MR sensor The distance is greater than one magnetic pole pitch of the first magnetic grid 10 . The sensing direction of the MR sensor and the two Hall sensors of each first sensing portion 120 is toward the first magnetic grid 10 along the radial direction of the axis 2 to be measured, and each MR sensor and Hall sensor are electrically connected Connected to processor 14.

When the shaft torque measurement system 1 of the present invention performs torque measurement, the MR sensor of each first sensing part 120 generates a first sensing signal, and the MR sensor outputs the first sensing signal to the processor 14, and each first The Hall sensor of the sensing part 120 generates a first analog signal when corresponding to the first magnetic grid 10, and the Hall sensor outputs the first analog signal to the processor 14, while the Hall sensor of the first sensing part 120 corresponds to the first contact When the seam 101 is formed, the Hall sensor does not generate the first analog signal, and interrupts the output of the first analog signal until the first seam 101 turns out of the sensing range of the Hall sensor during rotation, and the Hall sensor continues to generate and output the first analog signal. An analog signal, that is, a discontinuous first analog signal generated by the Hall sensor. The processor 13 selects to receive one of the first sensing signals output by the two MR sensors according to whether the first analog signal output by the Hall sensor is continuous or not.

Please also refer to FIG. 4 , which is a schematic diagram of sensing the first magnetic grid by the first sensing component of the shaft torque measurement system of the present invention. As shown in the figure, in this embodiment, the rotation direction of the shaft 2 to be measured is clockwise, and the first seam 101 gradually approaches the sensing range of the first sensing part 120 on the right side of the figure. Before entering the sensing range of the Hall sensor of the first sensing part 120 on the right in the figure, the processor 14 receives the first sensing signal output by the MR sensor of the first sensing part 120 on the right in the figure.

As the shaft 2 to be measured continues to rotate, the first seam 101 enters the sensing range of the Hall sensor located on the right side of the MR sensor of the first sensing part 120 on the right side of the figure, that is, the first sensor on the right side of the figure. When the sensing direction of the Hall sensor on the right side of the MR sensor of the sensing part 120 faces the surface of the shaft 2 to be measured in the first seam 101, the first sensing part 120 on the right side of the figure in the MR sensor The Hall sensor on the right cannot generate the first analog signal. At this time, the Hall sensor on the right side of the MR sensor of the first sensing part 120 on the right in the figure interrupts the output of the first analog signal, that is, the right side in the figure The first analog signal output by the Hall sensor on the right side of the MR sensor of the first sensing part 120 is discontinuous. When the first analog signal received by the processor 14 is discontinuous, it determines that The MR sensor of a sensing part 120 is close to the first seam 101, that is, the MR sensor of the first sensing part 120 on the right side of the figure is close to the first seam 101, based on the first sensing part 120 on the right side of the figure When the MR sensor is close to the judgment of the first seam 101, the processor 14 interrupts receiving the first sensing signal output by the MR sensor of the first sensing part 120 on the right side of the figure, and switches to receive the first sensing signal of another first sensing part 120. The first sensing signal output by the MR sensor, that is, the processor 14 receives the first sensing signal output by the MR sensor of the first sensing part 120 on the left in the figure at this time.

The shaft 2 to be measured continues to drive the first magnetic grid 10 to rotate. When the first seam 101 enters the sensing range of the Hall sensor located on the right side of the MR sensor of the first sensing part 120 on the left side of the figure, the left side of the figure The sensing direction of the Hall sensor on the right side of the MR sensor of the first sensing part 120 faces the surface of the shaft 2 to be measured in the first seam 101, which cannot generate the first analog signal. At this time, in the figure The Hall sensor on the right side of the MR sensor of the first sensing part 120 on the left interrupts the output of the first analog signal, that is, the output of the Hall sensor on the right side of the MR sensor of the first sensing part 120 on the left in the figure The first analog signal is discontinuous. When the first analog signal received by the processor 14 is discontinuous, it judges that the MR sensor of the first sensing part 120 on the left side of the figure is close to the first seam 101, that is, the judgment diagram The MR sensor of the first sensing part 120 on the upper left is close to the first seam 101. Based on the judgment that the MR sensor of the first sensing part 120 on the left is close to the first seam 101, the processor 14 interrupts the reception of the figure. The first sensing signal output by the MR sensor of the first sensing part 120 on the upper left, and switched to receive the first sensing signal output by the MR sensor of the other first sensing part 120, that is, the processor 14 receives The first sensing signal output by the MR sensor of the first sensing unit 120 on the right side of the figure.

When the rotating first seam 101 enters the sensing range of the Hall sensor of the first sensing part 120 on the right side of the figure again, the processor 14 switches the received first sensing signal again, and switches in this way, the processor 14 Continuously receiving the first sensing signals output by the two first sensing parts 120 of the first sensing component 12, and receiving the first sensing signals output by the two first sensing parts 120 of the first sensing component 12. The sensing signal is integrated into a first sensing signal.

Similarly, if the rotation direction of the shaft 2 to be measured is counterclockwise, the processor 14 first receives the first sensing signal output by the MR sensor of the first sensing part 120 on the left in the figure, and when the rotation direction of the shaft 2 counterclockwise is A seam 101 enters the sensing range of the Hall sensor of the first sensing part 120 on the left in the figure, and the processor 14 interrupts the first sensing that receives the output of the MR sensor of the first sensing part 120 on the left in the figure. signal, and switch to receive the first sensing signal output by the MR sensor of the first sensing part 120 on the right in the figure, when the first seam 101 that continues to rotate enters the first sensing part 120 on the right The sensing range of the Hall sensor, the processor 14 interrupts receiving the first sensing signal output by the MR sensor of the first sensing part 120 on the right, and switches to receiving the MR sensor of the first sensing part 120 on the left in the figure. The first sensing signal output by the sensor. In this way, the cyclic switching is continued, and the processor 14 continues to receive the first sensing signals output by the two first sensing parts 120 of the first sensing component 12, and the received two first sensing signals of the first sensing component 12 The first sensing signal output by the sensing unit 120 is integrated into a first sensing signal.

Same as the first sensing component 12, each second sensing portion 130 of the second sensing component 13 also has an MR sensor and two Hall sensors, and the two Hall sensors are symmetrically arranged on both sides of the MR sensor, each Each second sensing part 130 has a magnetic head, and the magnetic head of each second sensing part 130 faces the second magnetic grid 11 respectively, so as to sense the second magnetic grid 11, and each Hall sensor and the MR sensor The distance is greater than one magnetic pole pitch of the second magnetic grid 11 . The MR sensor and the two Hall sensors of each second sensing part 130 face the second magnetic grid 11 along the radial direction of the axis to be measured 2, and each MR sensor and Hall sensor are respectively electrically connected to the processor 14. The MR sensor of each second sensing part 130 generates a second sensing signal, and the MR sensor outputs the second sensing signal to the processor 13 . The Hall sensor of each second sensing part 130 generates a second analog signal when corresponding to the second magnetic grid 11, and the Hall sensor outputs the second analog signal to the processor 14, while the Hall sensor of the second sensing part 130 When corresponding to the second seam 111, the Hall sensor does not generate the second analog signal, and interrupts the output of the second analog signal until the second seam 111 rotates out of the sensing range of the Hall sensor, and the Hall sensor continues Generate and output a second analog signal. The processor 14 alternately receives one of the second sensing signals output by the two MR sensors according to whether the second analog signal output by the Hall sensor is continuous or not. In other words, the principle of sensing the first magnetic grid 10 by the first sensing component 12 is the same, the two second sensing parts 130 of the second sensing component 13 respectively output the second sensing signals, and the processor 14 According to the interruption of the second analog signal output by the Hall sensor of one of the second sensing parts 130, the second sensing signal output by the MR sensor of the other second sensing part 130 is selected and received, and the cycle is based on this principle switch to receive the second sensing signals output by the MR sensors of the two second sensing parts 130, and then integrate the received second sensing signals output by the MR sensors of the two second sensing parts 130 into a second sensing signal to complete the sensing of the second magnetic grid 11 .

It should be noted that the first sensing signal generated by the MR sensors of the two first sensing parts 120 sensing the first magnetic grating 10 and the MR sensors of the two second sensing parts 130 sensing the second magnetic grating 11 The second sensing signal generated by sensing is a pulse signal, and the pulse signals output by the MR sensors of the two first sensing parts 120 can be used to calculate the points on the axis 2 to be measured corresponding to the two first sensing parts 120. For the position angle, the position angle of the points corresponding to the two second sensing parts 130 on the axis 2 to be measured can be calculated through the pulse signals output by the MR sensors of the two second sensing parts 130 . In other words, the processor 14 can calculate the position angle of the points corresponding to the two first sensing parts 120 on the axis to be measured 2 through the first sensing signal, and can also calculate the angle of the axis to be measured through the second sensing signal. 2 is the position angle of the points corresponding to the two second sensing parts 130 . When using the shaft torque measurement system 1 of the present invention, the first sensing component 12 can take the first joint 101 as the zero point, and the second sensing component 13 can use the second joint 111 as the zero point, when the first magnetic grid 10 The first analog signal and the second analog signal output by the Hall sensors of the first sensing component 12 and the second sensing component 13 can capture the corresponding zero point , and then start to output the absolute position angle of the axis 2 to be measured. In other words, the combination of the first magnetic grid 10 and the first sensing component 12 and the combination of the second magnetic grid 11 and the second sensing component 13 at this time are equivalent to two sets of incremental encoders, the first magnetic grid 10 and the second magnetic grid 11 rotate one revolution along with the shaft 2 to be measured, that is, the preset zero point can be found through the first analog signal and the second analog signal.

The following explains in detail how the processor 14 calculates the torque of the shaft 2 to be measured. When the shaft 2 to be measured rotates along its axis, the maximum stress of the shaft 2 to be measured is distributed on its surface, and the stress expression is:

In the formula:

M _x —torque on the cross-section of the shaft 2 to be measured;

ρ—the distance from any point to the center of the circle;

I _P —polar moment of inertia.

In the formula, D is the radius of the axis 2 to be measured.

The expressions of the stress and strain of axis 2 to be measured are:

τ=G·r

In the formula:

G—shear modulus of elasticity, the general steel G is 80GPa,

In the formula:

μ-Poisson's ratio

When the shaft 2 to be measured rotates along its axis, the strain becomes:

In the formula:

That is, when G=80GPa, or /> In the formula, l is the distance between two points on the axis 2 to be measured.

In this way, by measuring the amount of deformation between two points on the shaft 2 to be measured, the magnitude of the torque on the shaft 2 to be measured can be calculated. In other words, the magnitude of the torque on the shaft 2 to be measured can be calculated by measuring the angle change between two points on the shaft 2 to be measured. In this way, after the first magnetic grid 10 and the second magnetic grid 11 are installed on the surface of the shaft 2 to be measured, and the first sensor assembly 12 and the second sensor assembly 12 are installed corresponding to the first magnetic grid 10 and the second magnetic grid 11 component 13, and then measure the distance between two points on the shaft 2 to be measured, and drive the shaft 2 to be measured to rotate. A magnetic grid 10 and a second magnetic grid 11 generate a first sensing signal and a second sensing signal respectively, and when the processor 14 receives the first sensing signal and the second sensing signal, it first integrates and receives the first sensing signal and the second sensing signal respectively. The first sensing signal and the second sensing signal are obtained to obtain the first sensing signal corresponding to the first sensing signal and the second sensing signal corresponding to the second sensing signal, and according to the first sensing signal, The second sensing signal and the distance between two points on the shaft 2 to be measured can be used to obtain the instant torque of the shaft 2 to be measured through the above calculation method. And the precision of its torque measurement is inversely proportional to the size of the distance between the first sensing part 120 and the second sensing part 130 along the axial direction of the shaft 2 to be measured. When installing, as long as the first magnetic grid 10 and the second The larger the installation distance between the two magnetic grids 11 is set, the higher the accuracy of the torque measurement result of the shaft torque measurement system 1 to be measured 2 is.

In this embodiment, a range finder is used to measure the distance between two points on the axis 2 to be measured, since the magnetic head of the MR sensor of the first sensing part 120 and the magnetic head of the MR sensor of the second sensing part 130 are along the axis to be measured The radial direction of the axis 2 faces the first magnetic grating 10 and the second magnetic grating 11 respectively, that is, the magnetic head of the MR sensor of the first sensing part 120 and the magnetic head of the MR sensor of the second sensing part 130 are along the axis to be measured The radial directions of 2 are respectively towards two points on the axis 2 to be measured, so the position of one point on the axis 2 to be measured corresponds to the position of the first magnetic grating 10 towards which the magnetic head of the MR sensor of the first sensing part 120 is directed. The position of another point on the measurement axis 2 corresponds to the position of the second magnetic grating 11 towards which the magnetic head of the MR sensor of the second sensing part 130 is directed. In other words, the distance between two points on the axis 2 to be measured is equal to Measure the position of the first magnetic grating 10 corresponding to the magnetic head of the MR sensor of the first sensing part 120 and the position of the second magnetic grating 11 corresponding to the magnetic head of the MR sensor of the second sensing part 130 along the axis to be measured 2 The distance in the axial direction, where the rangefinder can use a laser rangefinder, an ultrasonic rangefinder or other rangefinders that can achieve precise distance measurement.

In this way, although the shaft torque measurement system 1 of the present invention adopts the first magnetic grid 10 with the first seam 101 and the second magnetic grid 11 with the second seam 111, the shaft torque measurement system 1 of the present invention uses the above-mentioned The shaft torque measurement method of the shaft torque measurement method for the shaft 2 to be measured can avoid the influence of the first joint 101 and the second joint 111, and the processor 14 can respectively integrate the first sensing signal and the second sensing signal to obtain the first sensing signal. The sensing signal and the second sensing signal, and then calculate the torque of the shaft 2 to be measured according to the distance between the first sensing signal, the second sensing signal and two points on the shaft 2 to be measured.

Further, the processor 14 can also obtain the position angle of the axis to be measured 2 and the position angle difference between two points of the axis to be measured 2 through the first sensing signal and the second sensing signal, and can also obtain the position angle of the axis to be measured at the same time. 2, so, using the shaft torque measurement system 1 of the present invention to measure the shaft 2 to be measured can selectively measure the position angle of the shaft 2 to be measured and the position angle difference between two points of the shaft 2 to be measured according to actual needs , the torque or rotational speed of the shaft 2 to be measured.

The installation of the shaft torque measurement system of the present invention will be described in detail below, please refer to FIG. 2 again. The first magnetic grid 10 and the second magnetic grid 11 of the present invention are strip-shaped magnetic grids without a metal backing. When installing, they can be tightly adhered to the surface of the shaft 2 to be measured by adhesives. , the strip-shaped first magnetic grating 10 and the second magnetic grating 11 circle the shaft 2 to be measured along the radial direction of the shaft 2 to be measured, and form a first seam 101 and a second seam 111 at the interface respectively. In this way, through the strip-shaped first magnetic grid 10 and the second magnetic grid 11, the shaft torque measurement system 1 of the present invention can be used to measure the torque of the shafts of different mechanical equipment, and for shafts 2 of different sizes to be measured, It is only necessary to select the first magnetic grid 10 and the second magnetic grid 11 of appropriate length according to the circumference of the shaft 2 to be measured, and there is no need to specially design or customize a ring-shaped closed magnetic grid corresponding to the circumference of the shaft 2 to be measured.

Moreover, the thickness of the first magnetic grid 10 and the second magnetic grid 11 is between 1.0 mm and 1.5 mm. In this embodiment, the thickness is 1.0 mm. It can be more easily adhered to the surface of the shaft 2 to be measured during installation.

Please also refer to FIG. 5 , which is an enlarged view of area A in FIG. 4 . As shown in the figure, in this embodiment, there is also a magnetic grid protection layer 15 , and the magnetic grid protection layer 15 is disposed on the surface of the first magnetic grid 10 away from the shaft 2 to be measured. In this embodiment, the magnetic grid protective layer 15 is a thin stainless steel strip with a thickness of 0.2mm. After the first magnetic grid 10 is installed, the magnetic grid protective layer 15 is covered and fixed on the surface of the first magnetic grid 10 to protect the first magnetic grid. The magnetic grid 10 plays a protective role. Similarly, in order to protect the second magnetic grid 11 , after the second magnetic grid 11 is installed, the magnetic grid protection layer 15 is also covered on the surface of the second magnetic grid 11 and fixed.

Next, install the first sensing component 12 and the second sensing component 13, please refer to FIG. 2 and FIG. 5 together. When installing the two first sensing parts 120 of the first sensing component 12 or the two second sensing parts 130 of the second sensing component 13, the distance between the two first sensing parts 120 is greater than the first seam 101, the distance between the two second sensing parts 130 is greater than the width of the second seam 111, so as to prevent the first seam 101 from simultaneously entering the sensing range of the MR sensors of the two first sensing parts 120 or otherwise The second seam 111 enters the sensing ranges of the MR sensors of the two second sensing parts 130 at the same time, so as to avoid affecting the output of the first sensing signal and the second sensing signal at the same time.

At the same time, considering that the shaft 2 to be measured will fluctuate due to its accuracy problem when it rotates, especially when the diameter of the shaft 2 to be measured is relatively large, it may make the first magnetic grid 10 and the first sensor Friction occurs between the two first sensing parts 120 of the component 12 or the second magnetic grid 11 and the two second sensing parts 130 of the second sensing component 13, damaging the first magnetic grid 10 and the second magnetic grid 11 1. The first sensing part 120 or the second sensing part 130, in order to avoid accidental damage, when installing, ensure the distance air gap between the first sensing part 120 and the first magnetic grid 101 and the distance between the second sensing part 130 and the second sensing part 130. The air gap between the second magnetic grid 111 is between 0.5 mm and 1.5 mm. In this embodiment, the air gap between the first sensing part 120 and the first magnetic grid 101 and the second sensing part 130 The air gap with the second magnetic grid 111 is 1.5mm. Based on this, the magnetic pole distance between the first magnetic grid 10 and the second magnetic grid 11 is relatively large. In this embodiment, the magnetic pole distance between the first magnetic grid 10 and the second magnetic grid 11 is 5mm, that is, the first sensing The distance between the MR sensor and the Hall sensor of the part 120 and the distance between the MR sensor and the Hall sensor of the second sensing part 130 are greater than 5 mm.

In order to make it easier for the first sensing assembly 12 and the second sensing assembly 13 to meet the above-mentioned distance installation requirements, the shaft torque measurement system 1 of the present invention also includes a mounting bracket (not shown in the figure), on the first sensing part After adjusting the installation distance of 120 or the second sensing part 130 , use screws to pass through the first mounting hole 1201 or the second mounting hole 1301 to fix the first sensing part 120 or the second sensing part 130 on the mounting bracket. The first sensing part 120 and the second sensing part 130 have MR sensors respectively, and the MR sensors use the magnetoresistance effect to sense the rotating first magnetic grid 10 and the second magnetic grid 11. The first magnetic grid in this embodiment 10 and the second magnetic grid 11 respectively have multiple pairs of magnetic poles, the first magnetic grid 10 and the second magnetic grid 11 rotate one revolution with the shaft 2 to be measured, the pulses output by the first sensing part 120 and the second sensing part 130 The number of signals is twice the number of magnetic pole pairs of the first magnetic grid 10 and the second magnetic grid 11, that is, the more magnetic pole pairs the first magnetic grid 10 and the second magnetic grid 11 have, the shaft torque measurement system of the present invention The higher the resolution of 1, the higher the measurement accuracy of the torque of the shaft 2 to be measured, especially when using the shaft torque measurement system 1 of the present invention to measure the torque of the shaft 2 to be measured with a relatively large shaft radius, its resolution Relatively higher, the measurement accuracy is relatively greater. In this way, the shaft torque measurement system 1 of the present invention adopts the first magnetic grid 10 with the first joint 101 and the second magnetic grid 11 with the second joint 111, which not only makes the shaft torque measurement system 1 of the present invention suitable for Torque measurement is performed on shafts 2 to be measured with different diameters, and also has high-resolution and high-precision measurement results. Further, each first sensing part 120 also has a first wiring port 1202, each second sensing part 130 also has a second wiring port 1302, the MR sensor and Hall sensor of each first sensing part 120 Connect to the processor 14 with a signal connection line through the first connection port 1202, and connect the MR sensor and the Hall sensor of each second sensing part 130 to the processor 14 through the second connection port 1302 with a signal connection line, and the processor 14 Continuously receive the first analog signal, the first sensing signal, the second analog signal and the second sensing signal, and make corresponding judgments, switch to receive the first sensing signal or the second sensing signal, and integrate to form a first The sensing signal and the second sensing signal are finally processed to obtain the magnitude of the torque of the rotating shaft 2 to be measured.

Furthermore, the shaft torque measurement system 1 of this embodiment further includes an output module 16 and a display module 17 , and the processor 14 is electrically connected to the display module 17 through the output module 16 . When the processor 14 continuously receives the first sensing signal and the second sensing signal, and according to the first sensing signal and the second sensing signal formed by integrating the first sensing signal and the second sensing signal and the axis to be measured The distance between the two points on 2 obtains the torque measurement result of the shaft 2 to be measured, and then generates a display signal according to the measurement result, and then transmits the display signal to the display module 17 through the output module 16, and the display module 17 converts the display signal into a torque amount , and then can intuitively display the torque of the shaft 2 to be measured according to the display signal. At the same time, the position angle of the shaft 2 to be measured, the position angle difference or the rotational speed between two points of the shaft 2 to be measured can also be output, so that the shaft torque measurement system 1 of the present invention has multiple measurement functions.

In this embodiment, a calculator is used to continuously receive the first sensing signal and the second sensing signal, and write the distance between two points on the axis 2 to be measured measured by the range finder into the running program, and calculate in real time The torque of the rotating shaft 2 to be measured is displayed, and the torque of the shaft 2 to be measured is displayed as a computer monitor. It should be noted that this embodiment is only an embodiment of the shaft torque measurement system 1 of the present invention, and should not be limited thereto.

To sum up, the present invention provides a shaft torque measurement system and measurement method, which installs the first magnetic grating with the first seam and the second magnetic grating with the second seam at intervals on the shaft to be measured On the surface, make the first magnetic grid and the second magnetic grid rotate along with the axis to be measured, and use the first sensing part of the first sensing component to sense the rotating first magnetic grid to generate a first sensing signal, The second sensing part of the second sensing component is used to sense the rotating second magnetic grid to generate a second sensing signal, and then the processor compares the first sensing signal output by the first sensing component with the second sensing signal. The second sensing signal output by the sensing component is processed to obtain the torque of the shaft to be measured. The shaft torque measurement system of the present invention is simple to install, and can be applied to torque measurement of shafts to be measured with different shaft diameters, and the resolution is, With high measurement accuracy, it can effectively monitor the shaft power of mechanical equipment in real time, and then adjust its output power reasonably while controlling the normal operation of mechanical equipment to improve work efficiency. At the same time, it can also be used to detect mechanical equipment failures Make quick diagnosis and improve maintenance efficiency.

It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, device comprising a series of elements not only includes those elements, but also includes Including other elements not expressly listed, or also including elements inherent in such process, method, article or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the present invention, without departing from the gist of the present invention and the protection scope of the claims, many forms can also be made, all of which belong to the protection of the present invention.

Claims (7)

1. A shaft torque measurement system, comprising:

a first magnetic grid having a first joint and arranged on the surface of the shaft to be measured;

A second magnetic grating having a second joint and disposed on the surface of the shaft to be measured and spaced apart from the first magnetic grating;

the first sensing assembly comprises two first sensing parts, wherein the two first sensing parts are arranged at intervals and respectively face the first magnetic grids along the radial direction of the shaft to be measured, and the two first sensing parts are used for sensing the first magnetic grids rotating along with the shaft to be measured so as to generate first sensing signals;

the second sensing assembly comprises two second sensing parts, wherein the two second sensing parts are arranged at intervals and respectively face the second magnetic grids along the radial direction of the shaft to be measured, and the two second sensing parts are used for sensing the second magnetic grids rotating along with the shaft to be measured so as to generate second sensing signals;

a processor that receives the first and second sensing signals and that processes the first and second sensing signals to obtain a torque of the shaft to be measured;

the interval distance between the two first sensing parts is larger than the width of the first joint, and the interval distance between the two second sensing parts is larger than the width of the second joint;

Each first sensing part and each second sensing part are respectively provided with an MR sensor and two Hall sensors, the two Hall sensors are symmetrically arranged on two sides of the MR sensor, the MR sensor and the two Hall sensors of each first sensing part are arranged along the radial direction of the shaft to be measured and face the first magnetic grid, and the MR sensor and the two Hall sensors of each second sensing part are arranged along the radial direction of the shaft to be measured and face the second magnetic grid; wherein the first sensing assembly alternately receives the first sensing signals generated by the MR sensor of one of the two first sensing parts through first analog signals generated by the two hall sensors of each of the first sensing parts; wherein the second sensing assembly alternately receives the second sensing signals generated by the MR sensor of one of the two second sensing parts through the second analog signals generated by the two hall sensors of each of the second sensing parts;

the processor integrates the first sensing signals generated by the MR sensors of the two first sensing parts which are received alternately into a first sensing signal, the processor integrates the second sensing signals generated by the MR sensors of the two second sensing parts which are received alternately into a second sensing signal, and the processor obtains the torque of the shaft to be measured according to the first sensing signals and the second sensing signals.

2. The axle torque measurement system of claim 1, wherein the first and second magnetic gratings each have a thickness of between 1.0mm and 1.5mm, and wherein an air gap between the first and second sensing portions and the second magnetic grating is between 0.5mm and 1.5 mm.

3. The axle torque measurement system of claim 1, wherein a distance between the hall sensor and the MR sensor in each of the first sensing portions is greater than a pole pitch of the first magnetic grid; the distance between the hall sensor and the MR sensor in each of the second sensing portions is greater than the magnetic pole pitch of the second magnetic grid.

4. The axle torque measurement system of claim 3, further comprising a display module, wherein the processor obtains a measurement result based on the first and second sensor signals, generates a display signal based on the measurement result, and transmits the display signal to the display module, wherein the display module displays the torque of the axle to be measured based on the display signal.

5. The shaft torque measurement system of claim 1, further comprising a magnetic grating protective layer disposed on surfaces of the first magnetic grating and the second magnetic grating distal from the shaft to be measured.

6. A shaft torque measurement method using the shaft torque measurement system of claim 1, comprising the steps of:

the first magnetic grid and the second magnetic grid are arranged on the surface of the shaft to be measured, and the first sensing component and the second sensing component are respectively arranged corresponding to the first magnetic grid and the second magnetic grid;

the first sensing component and the second sensing component respectively sense the first magnetic grid and the second magnetic grid which rotate along with the shaft to be measured, and respectively generate the first sensing signal and the second sensing signal;

the processor processes the first and second sensing signals to obtain the torque of the shaft to be measured.

7. The shaft torque measurement method according to claim 6, wherein in the step of respectively sensing the first magnetic gratings which rotate with the shaft to be measured and generating first sensing signals, one of the two first sensing portions is selected, and the MR sensor of the selected first sensing portion senses the first magnetic gratings which rotate with the shaft to be measured and generates the first sensing signals; the first seam is sensed by the Hall sensor of the first sensing part to generate a discontinuous first analog signal, the MR sensor of the other first sensing part is switched to sense the first magnetic grid rotating along with the shaft to be measured, and the other first sensing signal is generated; in the step of respectively sensing the second magnetic gratings rotating along with the shaft to be measured and generating second sensing signals, selecting one of the two second sensing parts, and the MR sensor of the selected second sensing part senses the first magnetic gratings rotating along with the shaft to be measured and generates the second sensing signals; the hall sensor of the selected second sensing part senses the second joint to generate a discontinuous second analog signal, and the MR sensor of the other second sensing part senses the second magnetic grid rotating along with the shaft to be measured and generates the other second sensing signal.