Multi-connecting-rod device for measuring torque and measuring method of multi-connecting-rod device

Abstract

The invention relates to a multi-connecting-rod device for measuring torque and a measuring method thereof. The multi-connecting-rod device for measuring torque comprises a driving motor, a brake and a measuring assembly. The measuring assembly comprises a first flange plate, a second flange plate and a three-connecting-rod assembly, the first flange plate is connected with the second flange plate through the three-connecting-rod assembly, the side, away from the three-connecting-rod assembly, of the first flange plate is connected with the driving motor through a driving shaft, and the side, away from the three-connecting-rod assembly, of the second flange plate is connected with the brake through a driven shaft. The measuring process comprises the steps of measuring a strain value, calculating a stress value and calculating the torque of the driving shaft. Compared with a traditional torque measuring method, the three-connecting-rod assembly can only transmit torque, influences of other bending moments except the torque are eliminated, and therefore the measuring precision is improved; in addition, the three-connecting-rod assembly averages the torque, increases the measuring range, and can measure large torque.

Description

Technical Field

[0001] The present invention relates to the technical field of torque measurement, and in particular to a multi-link device for measuring torque and a measuring method thereof. Background Art

[0002] At present, torque is an important measurement in the field of mechanics. Accurate torque measurement can provide scientific data for mechanical design. The principle of torque measurement device is usually to install a sensor device on the rotating device to measure the change of relevant physical quantities, so as to obtain the torque of the rotating mechanism.

[0003] In wind turbines, the measurement of main shaft torque is crucial for studying the operating conditions and dynamic responses of wind turbines. At the same time, the torque of the transmission system of high-megawatt units is as high as MN·m level, and the dynamic characteristics are complex. The traditional torque measurement method has a limited range and cannot measure extremely large torques. It is also easily affected by other bending moments besides torque, resulting in low measurement accuracy. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a multi-link device for measuring torque and a measuring method thereof, which has the advantage of being able to measure large torques and at the same time improve the measurement accuracy.

[0005] The above-mentioned inventive object of the present invention is achieved through the following technical solutions: on the one hand, the present invention provides a multi-link device for measuring torque, including a drive motor, a brake and a measuring component; the measuring component includes a first flange, a second flange and a three-link assembly, the first flange is connected to the second flange through the three-link assembly, the side of the first flange away from the three-link assembly is connected to the drive motor through a driving shaft, and the side of the second flange away from the three-link assembly is connected to the brake through a passive shaft; the drive motor is used to apply torque to the driving shaft; the brake is used to provide resistance.

[0006] Preferably, in the multi-link device for measuring torque provided by the present invention, the three-link assembly includes three link units, the first ends of the three link units are connected to the first flange, the second ends of the three link units are connected to the second flange, and each adjacent two link units are spaced a preset distance apart.

[0007] Preferably, in the multi-link device for measuring torque provided by the present invention, a first preset angle is provided between the first ends of every two adjacent link units, and the range of the first preset angle is 110°-130°.

[0008] Preferably, in the multi-link device for measuring torque provided by the present invention, a second preset angle is provided between the second ends of every two adjacent link units, and the range of the second preset angle is 110°-130°.

[0009] Preferably, in the multi-link device for measuring torque provided by the present invention, the link unit includes a connecting rod and a torque sensor, the outer wall of the connecting rod facing the first flange and the outer wall of the connecting rod facing the second flange are both provided with grooves, strain gauges are placed in both grooves, the torque sensor is arranged on the outer side wall of the connecting rod, and the two strain gauges are connected to the torque sensor via wires.

[0010] Preferably, in the multi-link device for measuring torque provided by the present invention, a through hole is provided on the inner side wall of each of the grooves, one end of the wire is connected to the torque sensor, and the other end of the wire passes through the through hole and is connected to the strain gauge.

[0011] Preferably, in the multi-link device for measuring torque provided by the present invention, the torque sensor is powered by a battery.

[0012] Preferably, in the multi-link device for measuring torque provided by the present invention, the first end of the link unit is connected to the first flange by bolts, and the second end of the link unit is connected to the second flange by bolts.

[0013] Preferably, in the multi-link device for measuring torque provided by the present invention, the end of the active shaft away from the drive motor is connected to the first flange by bolts, and the end of the passive shaft away from the brake is connected to the second flange by bolts.

[0014] On the other hand, the present invention provides a method for measuring torque using the multi-link device as described above, comprising the following steps:

[0015] Static calibration is performed on the three connecting rods in the three-link assembly, the driving motor drives the driving shaft to rotate, the driving shaft drives the first flange to rotate, the first flange applies force to the three-link assembly, so that the three-link assembly generates torque, so as to measure the strain value of each connecting rod in the three-link assembly;

[0016] Obtaining a force value of the connecting rod according to the calibrated data of the connecting rod and the strain value of the connecting rod;

[0017] A torque value is obtained according to the force value of the connecting rod and the distance from the connecting rod to the center of the first flange and / or the second flange, and the sum of the three torque values ​​is taken as the torque of the driving shaft.

[0018] In summary, the beneficial technical effects of the present invention are as follows: the multi-link device for measuring torque and the measuring method thereof provided in the present application, wherein the multi-link device for measuring torque comprises a drive motor, a brake and a measuring assembly; the measuring assembly comprises a first flange, a second flange and a three-link assembly, the first flange is connected to the second flange through the three-link assembly, the side of the first flange away from the three-link assembly is connected to the drive motor through the active shaft, and the side of the second flange away from the three-link assembly is connected to the brake through the passive shaft; the drive motor is used to apply torque to the active shaft; the brake is used to provide resistance; the measurement process is: measuring strain value-calculating force value-calculating the torque of the active shaft; compared with the traditional torque measurement method, the three-link assembly can only transmit torque, eliminating the influence of other bending moments except torque, thereby improving the measurement accuracy; in addition, the three-link assembly averages the torque, improves the measuring range, and can measure large torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a multi-link device for measuring torque provided in an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the connection structure of the first flange, the second flange and the three-link assembly in the multi-link device for measuring torque provided in an embodiment of the present invention.

[0021] Figure 3 It is a side view of the connection structure of the first flange, the second flange and the three-link assembly in the multi-link device for measuring torque provided by an embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a second flange in a multi-link device for measuring torque provided in an embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the connection structure between the first flange and the three-link assembly in the multi-link device for measuring torque provided in an embodiment of the present invention.

[0024] Figure 6 It is a schematic structural diagram of a connecting rod unit in a multi-link device for measuring torque provided in an embodiment of the present invention.

[0025] Figure 7 It is a side view of a connecting rod unit in a multi-link device for measuring torque provided in an embodiment of the present invention.

[0026] Figure 8 It is a flow chart of a method for measuring torque using a multi-link device provided by another embodiment of the present invention.

[0027] In the figure, 1, multi-link device; 10, driving motor; 20, brake; 30, measuring component; 31, first flange; 311, first threaded hole; 312, second threaded hole; 313, second fastening bolt; 32, second flange; 321, third threaded hole; 322, fourth threaded hole; 323, fourth fastening bolt; 33, three-link assembly; 331, connecting rod unit; 3311, connecting rod; 3312, strain gauge; 3313, through hole; 40, active shaft; 50, passive shaft. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] Reference Figures 1 to 5 , a multi-link device 1 for measuring torque disclosed in the present invention, includes a driving motor 10, a brake 20 and a measuring assembly 30; the measuring assembly 30 includes a first flange 31, a second flange 32 and a three-link assembly 33, the first flange 31 is connected to the second flange 32 through the three-link assembly 33, the side of the first flange 31 away from the three-link assembly 33 is connected to the driving motor 10 through a driving shaft 40, and the side of the second flange 32 away from the three-link assembly 33 is connected to the brake 20 through a passive shaft 50; the driving motor 10 is used to apply torque to the driving shaft 40; the brake 20 is used to provide resistance; with such an arrangement, compared with the traditional torque measurement method, the three-link assembly 33 can only transmit torque, eliminating the influence of other bending moments except torque, thereby improving the measurement accuracy; in addition, the three-link assembly 33 averages the torque, improves the range, and can measure large torque.

[0030] By providing the three-link assembly 33, the passive shaft 50 and the active shaft 40 are flexibly connected, which can buffer the impact between the active shaft 40 and the passive shaft 50, effectively reduce noise and vibration, and improve the accuracy of measurement.

[0031] Specifically, the center line of the active shaft 40 is arranged parallel to the center line of the passive shaft 50. In some feasible embodiments, the center line of the active shaft 40 is arranged colinearly with the center line of the passive shaft 50. When rotating, there will be a certain gap between the axes of the active shaft 40 and the passive shaft 50.

[0032] The end of the driving shaft 40 away from the first flange 31 is connected to the driving motor 10 through a first coupling, and the end of the driven shaft 50 away from the second flange 32 is connected to the brake 20 through a second coupling.

[0033] Furthermore, in this embodiment, the three-link assembly 33 includes three link units 331, the first ends of the three link units 331 are connected to the first flange 31, the second ends of the three link units 331 are connected to the second flange 32, and each adjacent two link units 331 are spaced a preset distance apart.

[0034] During use, the driving motor 10 drives the active shaft 40 to rotate, and the rotation of the active shaft 40 drives the first flange 31 to rotate. The rotation of the first flange 31 applies force to the three connecting rod units 331, so that the torque generated by the three connecting rod units 331 is transmitted to the passive shaft 50 through the three connecting rod units 331, and the energy generated by the resistance consumption of the adjusting brake 20 is consumed. At this time, there is only axial force on the three connecting rod units 331, and the torque of the active shaft 40 can be obtained by measuring the force of the three connecting rod units 331.

[0035] Furthermore, in this embodiment, a first preset angle is disposed between the first ends of every two adjacent connecting rod units 331 , and the range of the first preset angle is 110°-130°.

[0036] like Figure 5 As shown, in this embodiment, the first preset angle is 120°.

[0037] Furthermore, in this embodiment, a second preset angle is disposed between the second ends of every two adjacent connecting rod units 331 , and the range of the second preset angle is 110°-130°.

[0038] like Figure 5 As shown, in this embodiment, the second preset angle is 120°.

[0039] Continue to refer to Figures 5 to 7 In this embodiment, the connecting rod unit 331 includes a connecting rod 3311 and a torque sensor. The outer wall of the connecting rod 3311 facing the first flange 31 and the outer wall of the connecting rod 3311 facing the second flange 32 are both provided with grooves, and strain gauges 3312 are placed in the two grooves. The torque sensor is arranged on the outer wall of the connecting rod 3311, and the two strain gauges 3312 are connected to the torque sensor through wires.

[0040] Specifically, the torque sensor's built-in wireless system collects and transmits data. The torque sensor is powered by a battery, which avoids complex wiring, reduces the space required for installation, and solves the problem of difficult installation of large torque measurements.

[0041] Specifically, the strain gauge 3312 is connected to the external data receiving device through the torque sensor. During the torque measurement process, the shape of the strain gauge 3312 changes, the torque sensor collects the corresponding change value, and transmits the data to the external data receiving device. The external data receiving device calculates the strain value based on the received data.

[0042] During use, when torque occurs on the shaft, the connecting rod 3311 is strained by force. The average value of the strain gauges 3312 on both sides is taken as the strain value to eliminate the influence of the bending moment on the connecting rod 3311. Static calibration is performed on the connecting rod 3311 in advance, and the force on the connecting rod 3311 is obtained through the calibration data and the measured strain value of the connecting rod 3311, and then the torque value is calculated from the distance from the connecting rod 3311 to the center of the first flange 31 or the second flange 32.

[0043] The measurement process of the multi-link device 1 for measuring torque provided in this embodiment is as follows: static calibration is performed on the three connecting rods 3311, the driving motor 10 drives the active shaft 40 to rotate, the active shaft 40 drives the first flange 31 to rotate, and the first flange 31 applies force to the three-link assembly 33, so that the three-link assembly 33 generates torque to measure the strain value of each connecting rod 3311; the force value of the connecting rod 3311 is obtained according to the calibration data of the connecting rod 3311 and the strain value of the connecting rod 3311; the torque value is obtained according to the force value of the connecting rod 3311 and the distance from the connecting rod 3311 to the center of the first flange 31 and / or the second flange 32, and the sum of the three torque values ​​is taken as the torque of the active shaft 40.

[0044] Furthermore, in this embodiment, a through hole 3313 is provided on the inner wall of each groove, one end of the wire is connected to the torque sensor, and the other end of the wire passes through the through hole 3313 and is connected to the strain gauge 3312 .

[0045] In this embodiment, the first end of the connecting rod unit 331 is connected to the first flange 31 by bolts, and the second end of the connecting rod unit 331 is connected to the second flange 32 by bolts; such an arrangement facilitates disassembly.

[0046] Specifically, the first ends of the three connecting rods 3311 are connected to the first flange 31 by bolts, and the second ends of the three connecting rods 3311 are connected to the second flange 32 by bolts.

[0047] The end of the driving shaft 40 away from the driving motor 10 is connected to the first flange 31 by bolts, and the end of the driven shaft 50 away from the brake 20 is connected to the second flange 32 by bolts.

[0048] Furthermore, in this embodiment, n first threaded holes 311 and m second threaded holes 312 are provided on the first flange 31, the n first threaded holes 311 are evenly distributed on the inner ring of the first flange 31, and the m second threaded holes 312 are evenly distributed on the outer ring of the first flange 31; n third threaded holes 321 and m fourth threaded holes 322 are provided on the second flange 32, the n third threaded holes 321 are evenly distributed on the inner ring of the second flange 32, and the m fourth threaded holes 322 are evenly distributed on the outer ring of the second flange 32.

[0049] During use, the end of the driving shaft 40 facing away from the driving motor 10 is connected to the first flange 31 through n first fastening bolts, and the n first fastening bolts are arranged in a one-to-one correspondence with the n first threaded holes 311, and the first fastening bolts are adapted to the first threaded holes 311; the first ends of the three connecting rods 3311 are respectively connected to the first flange 31 through three second fastening bolts 313, and the second fastening bolts 313 are adapted to the second threaded holes 312. One end of the passive shaft 50 facing away from the brake 20 is connected to the second flange 32 through n third fastening bolts, and the n third fastening bolts are arranged in a one-to-one correspondence with the n third threaded holes 321, and the third fastening bolts are adapted to the third threaded holes 321; the second ends of the three connecting rods 3311 are respectively connected to the second flange 32 through three fourth fastening bolts 323, and the fourth fastening bolts 323 are adapted to the fourth threaded holes 322; after the measurement is completed, the three-link assembly 33 can be removed from the active shaft 40 by loosening the second fastening bolts 313 and the fourth fastening bolts 323.

[0050] like Figure 2 As shown, in this embodiment, n is 6 and m is 24; of course, n can also be 7 or 8, and m can also be 26 or 28, and this embodiment does not limit this.

[0051] Continue to refer to Figure 8 Another embodiment provides a method for measuring torque using the multi-link device 1 as described above, comprising the following steps:

[0052] S101. Static calibration is performed on the three connecting rods 3311 in the three-link assembly 33. The driving motor 10 drives the active shaft 40 to rotate. The active shaft 40 drives the first flange 31 to rotate. The first flange 31 applies force to the three-link assembly 33, so that the three-link assembly 33 generates torque to measure the strain value of each connecting rod 3311 in the three-link assembly 33.

[0053] S102 , obtaining a force value of the connecting rod 3311 according to the calibration data of the connecting rod 3311 and the strain value of the connecting rod 3311 .

[0054] Specifically, the force value of each connecting rod 3311 is obtained according to the calibration data of the connecting rod 3311 and the strain value of the connecting rod 3311 .

[0055] S103 , obtaining a torque value according to the force value of the connecting rod 3311 and the distance from the connecting rod 3311 to the center of the first flange 31 and / or the second flange 32 , and taking the sum of the three torque values ​​as the torque of the driving shaft 40 .

[0056] Specifically, static calibration is performed on the three connecting rods 3311. The driving motor 10 drives the active shaft 40 to rotate, and the active shaft 40 drives the first flange 31 to rotate. The first flange 31 applies force to the three-link assembly 33, so that the three-link assembly 33 generates torque. The strain gauge 3312 on the connecting rod 3311 changes shape, and the torque sensor collects the corresponding change value and transmits the data to an external data receiving device. The external data receiving device calculates the strain value of each connecting rod 3311 based on the received data.

[0057] After the measurement is completed, the second fastening bolt 313 and the fourth fastening bolt 323 are loosened to remove the three-link assembly 33 from the driving shaft 40 and the driven shaft 50 .

[0058] The present application provides a multi-link device 1 for measuring torque and a measuring method thereof, wherein the multi-link device 1 for measuring torque comprises a drive motor 10, a brake 20 and a measuring assembly 30; the measuring assembly 30 comprises a first flange 31, a second flange 32 and a three-link assembly 33, the first flange 31 is connected to the second flange 32 through the three-link assembly 33, the side of the first flange 31 away from the three-link assembly 33 is connected to the drive motor 10 through a driving shaft 40, and the side of the second flange 32 away from the three-link assembly 33 is connected to the brake 20 through a passive shaft 50; the drive motor 10 is used to apply torque to the driving shaft 40; the brake 20 is used to provide resistance; the measuring process is: measuring strain value-calculating force value-calculating torque of the driving shaft 40; compared with the traditional torque measurement method, the three-link assembly 33 can only transmit torque, eliminating the influence of other bending moments except torque, thereby improving the measurement accuracy; in addition, the three-link assembly 33 averages the torque, improves the range, and can measure large torque.

[0059] The multi-link device 1 for measuring torque provided by the present invention has the following advantages: the device has a simple structure, is easy to manufacture, and is convenient to operate.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0061] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A multi-link device for measuring torque, characterized in that: Including drive motor, brake and measurement components; The measuring assembly comprises a first flange, a second flange and a three-link assembly, wherein the first flange is connected to the second flange through the three-link assembly, a side of the first flange facing away from the three-link assembly is connected to the driving motor through a driving shaft, and a side of the second flange facing away from the three-link assembly is connected to the brake through a driven shaft; The driving motor is used to apply torque to the driving shaft; The brake is used to provide resistance.

2. The multi-link device for measuring torque according to claim 1, characterized in that: The three-link assembly includes three link units, the first ends of the three link units are connected to the first flange, the second ends of the three link units are connected to the second flange, and each two adjacent link units are spaced a preset distance apart.

3. The multi-link device for measuring torque according to claim 2, characterized in that: A first preset angle is disposed between the first ends of each two adjacent connecting rod units, and the range of the first preset angle is 110°-130°.

4. The multi-link device for measuring torque according to claim 3, characterized in that: A second preset angle is disposed between the second ends of each two adjacent connecting rod units, and the range of the second preset angle is 110°-130°.

5. The multi-link device for measuring torque according to claim 4, characterized in that: The connecting rod unit includes a connecting rod and a torque sensor. A groove is provided on the side of the connecting rod facing the first flange and the side of the connecting rod facing the second flange. Strain gauges are placed in the two grooves. The torque sensor is arranged on the outer wall of the connecting rod. The two strain gauges are connected to the torque sensor through wires.

6. The multi-link device for measuring torque according to claim 5, characterized in that: A through hole is formed on the inner side wall of each groove, one end of the wire is connected to the torque sensor, and the other end of the wire passes through the through hole and is connected to the strain gauge.

7. The multi-link device for measuring torque according to claim 6, characterized in that: The torque sensor is powered by a battery.

8. The multi-link device for measuring torque according to claim 2, characterized in that: The first end of the connecting rod unit is connected to the first flange by bolts, and the second end of the connecting rod unit is connected to the second flange by bolts.

9. The multi-link device for measuring torque according to claim 1, characterized in that: One end of the driving shaft away from the driving motor is connected to the first flange by bolts, and one end of the driven shaft away from the brake is connected to the second flange by bolts.

10. A method for measuring a multi-link device for measuring torque according to any one of claims 1 to 9, characterized in that: The steps include: Static calibration is performed on the three connecting rods in the three-link assembly, the driving motor drives the driving shaft to rotate, the driving shaft drives the first flange to rotate, the first flange applies force to the three-link assembly, so that the three-link assembly generates torque, so as to measure the strain value of each connecting rod in the three-link assembly; Obtaining a force value of the connecting rod according to the calibrated data of the connecting rod and the strain value of the connecting rod; A torque value is obtained according to the force value of the connecting rod and the distance from the connecting rod to the center of the first flange and / or the second flange, and the sum of the three torque values ​​is taken as the torque of the driving shaft.

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