Torque measuring device

Abstract

The invention relates to the technical field of torque measurement, in particular to a torque measuring device. The device comprises a device body, the device body comprises a connecting body which is hollow in the axial direction, the first end of the connecting body is used for being connected with a power shaft of a driving part, and the second end of the connecting body is used for being connected with a load shaft to be measured; a hollow mounting opening is formed in the position, close to the first end, of the connecting body; a strain beam is arranged at the mounting opening, the two ends of the strain beam are connected to the side walls of the two sides of the mounting opening, and a resistance strain gauge is mounted in the middle of the strain beam and used for being connected to a strain bridge; the resistance strain gauge is also used for stress deformation so as to generate voltage variation on the strain bridge; the voltage variable quantity is used for corresponding to the torque loading force on the connecting body. According to the invention, a strain bridge is formed through the resistance strain gauges so as to measure the torque at the connection body; in order to more sensitively measure the torque, the resistance strain gauge is installed on the strain beam, and the strain beam is located at the hollowed-out installation opening.

Description

Technical Field

[0001] The present invention relates to the technical field of torque measurement, in particular to a torque measuring device. Background Art

[0002] Torque is a key operating parameter of power machinery. It's a crucial indicator of the on-site transmission condition of power equipment. Measuring torque signals is crucial for verifying the equipment's operating condition coefficient and actual load. For rotating equipment, developing systems to digitize the total torque generated by actual loads is an effective means of monitoring the health of the equipment. Long-term monitoring can also provide data support for fault prediction and diagnosis.

[0003] In practice, the torque on a rotating shaft often changes dynamically, such as during the operation of mechanical equipment. However, existing torque measurement devices often cannot accurately measure and output dynamic torque in real time. Traditional torque measurement devices typically use technologies such as strain gauges and resistance strain gauges, which have certain limitations in dynamic measurement. For example, on a rotating shaft, the deformation of the strain gauge is small, resulting in a limited change in the strain gauge's resistance. This results in poor sensitivity in torque measurement and can easily lead to inaccurate measurement results. Summary of the Invention

[0004] The present invention provides a torque measuring device, which can overcome certain defects of the prior art.

[0005] A torque measuring device according to the present invention includes a device body, the device body including a connector hollowed out along the axial direction, a first end of the connector being connected to a power shaft of a driving unit, and a second end of the connector being connected to a load shaft to be measured;

[0006] A hollow mounting opening is formed near the first end of the connector; a strain beam is provided at the mounting opening, with both ends of the strain beam connected to the side walls of the mounting opening; a resistance strain gauge is installed in the middle of the strain beam, and the resistance strain gauge is used to connect to the strain bridge; the resistance strain gauge is also used to deform under force to generate a voltage change on the strain bridge; the voltage change is used to correspond to the torque load force on the connector.

[0007] When the device body of the present invention is in use, the first end and the second end of the connector are first connected to the power shaft of the driving part and the load shaft to be measured respectively; that is, the connector itself can play a role similar to a coupling to realize transmission between the power shaft and the load shaft.

[0008] At the same time, the connector and the load shaft can rotate synchronously under the drive of the drive unit, and the torque at the connector can effectively reflect the torque of the load shaft. Furthermore, the present invention uses resistance strain gauges to form a strain bridge to measure the torque at the connector. To achieve more sensitive torque measurement, the resistance strain gauges are mounted on a strain beam located at the hollowed-out mounting opening.

[0009] Compared to the solid portion, the hollowed-out mounting area experiences a relatively greater rotational deformation during rotation, causing the strain gauge to also deform significantly. The change in resistance of the strain gauge also increases with the deformation, which in turn increases the voltage change across the strain bridge. This acts like an amplification mechanism, making the observation of rotational torque more sensitive and enabling the measured torque load to be accurately reflected through changes in the electrical signal.

[0010] In addition, the two ends of the strain beam are directly connected to the side walls of the mounting opening, so that the deformation sensitivity of the strain beam gradually increases from the two ends to the middle, and the middle part is more likely to deform; therefore, in the present invention, the resistance strain gauge is chosen to be arranged in the middle of the strain beam to improve the measurement sensitivity and accuracy.

[0011] Preferably, the connector includes a main shaft, with a first connecting groove and a second connecting groove formed at both ends of the main shaft respectively. The first connecting groove and the second connecting groove respectively form the first end and the second end of the connector, and are respectively used to connect the power shaft and the load shaft.

[0012] Preferably, a first flat notch for connecting to and transmitting with the driving unit power shaft is provided on the inner wall of the first connecting groove, and a second flat notch for connecting to and transmitting with the load shaft is provided on the inner wall of the second connecting groove.

[0013] Preferably, a mounting ring is coaxially expanded outwardly at a position near the first end of the main shaft, and a mounting opening is formed through the mounting ring; a plurality of mounting openings are provided and distributed in a circular pattern along the circumference of the mounting ring.

[0014] Preferably, a plate is formed at a position of the mounting ring above the strain beam, and a plurality of first threaded holes are formed at both ends of the plate; and a plurality of second threaded holes are also formed at both ends of the strain beam.

[0015] Preferably, the first threaded hole and the second threaded hole correspond to each other one by one and are spaced apart along the circumference of the mounting ring; the first threaded hole and the second threaded hole are used to screw in adjustment bolts to adjust the tightness of the connection between the strain beam and the plate body.

[0016] Preferably, the device body also includes a cylindrical fixed shell coaxial with the connecting body, and the main shaft can be located in the fixed shell; the two ends of the fixed shell are respectively connected to a first end plate and a second end plate in a circular shape; a plurality of first screw holes for inserting positioning bolts are formed at the first end plate, and the first end plate is used to be fixedly connected to the driving part; a bearing is provided in the middle of the second end plate, and the bearing is used to install the second end of the main shaft.

[0017] Preferably, a first annular mounting seat is provided at a side wall of the first end plate near the strain beam, and the first mounting seat is coaxially arranged with the main shaft; an outer ring plate is provided at the first mounting seat; a second mounting seat is coaxially formed at the main shaft, and an inner ring plate is provided at a side wall of the second mounting seat near the first mounting seat; the inner ring plate is used to power the strain bridge and transmit the signal generated by the voltage change to the outer ring plate, and the outer ring plate is used to output the received signal to an external circuit.

[0018] Preferably, a code disk for counting is provided on a side wall of the second mounting seat on a side far from the first mounting seat.

[0019] Preferably, a first coil is provided on the inner wall of the fixed shell, the first coil is connected to electricity and is used to power the outer ring plate; a second coil is coaxially arranged at the main shaft, and the position of the second coil corresponds to that of the first coil; the second coil is coupled to the first coil and is used to power the inner ring plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a principle block diagram of the detection module in Example 1.

[0021] Figure 2 This is the circuit schematic diagram of the AC-DC conversion circuit in the inner loop circuit unit.

[0022] Figure 3 This is a circuit schematic diagram of the first DC-DC conversion circuit and the DC-AC conversion circuit in the outer loop circuit unit.

[0023] Figure 4 This is the circuit schematic diagram of the front-end amplifier circuit in the inner loop circuit unit.

[0024] Figure 5 This is the circuit schematic diagram of the V / F conversion circuit and infrared emission circuit in the inner loop circuit unit.

[0025] Figure 6 This is the circuit schematic diagram of the infrared receiving circuit in the outer loop circuit unit.

[0026] Figure 7 This is the circuit schematic diagram of the frequency output circuit in the outer loop circuit unit.

[0027] Figure 8 This is a schematic structural diagram of the device body in Example 2;

[0028] Figure 9 for Figure 8 Schematic diagram of the structure without the fixed shell;

[0029] Figure 10 for Figure 9 Schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 11 for Figure 9 Structural diagram from another perspective;

[0031] Figure 12 Schematic diagram of the structure of the first end plate, the first mounting seat and the outer ring plate in Example 2;

[0032] Figure 13 This is a schematic structural diagram of the main shaft, second mounting seat, inner ring plate and other structures in Example 2;

[0033] Figure 14 This is a schematic structural diagram of the fixed housing in Example 2;

[0034] Figure 15 The measurement result when the torque interval of the input torque is 2 in Example 3;

[0035] Figure 16 This is the measurement result when the torque interval of the input torque in Example 3 is 5. DETAILED DESCRIPTION

[0036] In order to further understand the content of the present invention, the present invention is described in detail with reference to the embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] Combine Figure 1-Figure 7 This embodiment provides a torque measurement system, which includes a detection device and a detection module mounted on the detection device; the detection device has a fixed housing 520, and a connector 510 is rotatably disposed within the fixed housing 520; the connector 510 is used to connect the power shaft and the load shaft, and the power shaft and the load shaft together constitute a rotating shaft to be detected;

[0039] The detection module includes an inner ring circuit unit provided at the connector 510 and an outer ring circuit unit provided at the fixed housing 520, and the inner ring circuit unit and the outer ring circuit unit are independently arranged from each other; the inner ring circuit unit is used to detect the torque load force at the rotating shaft to be detected to generate an optical signal, and the outer ring circuit unit is used to detect the optical signal to generate a detection signal.

[0040] Specifically, when the measurement system of this embodiment is in use, a power shaft (driving unit) is connected to a load shaft (load shaft) via a connector to form a connected transmission. An inner ring circuit unit is then positioned within the connector and rotates therewith. During rotation, the torque load force of the rotating shaft to be detected (power shaft and output shaft) is measured and transmitted via an optical signal to an outer ring circuit unit fixed to the fixed housing. This effectively achieves contactless signal transmission between the dynamically rotating connector and the fixed housing, effectively ensuring the real-time and accuracy of the relationship between the generated optical signal and the measured torque load force.

[0041] The entire torque measurement system can operate stably during use and solves the problem of signal transmission during the rotation of the connecting body.

[0042] In this embodiment, the outer loop circuit unit has a DC-AC conversion circuit, and the inner loop circuit unit has a DC-AC conversion circuit; the DC-AC conversion circuit has a first coil 1110, and the AC-DC conversion circuit has a second coil 680; the DC-AC conversion circuit is used to convert the first DC power supply voltage received into a first AC power supply voltage and couple it to the second coil 680 via the first coil 1110, and the AC-DC conversion circuit is used to convert the coupling voltage at the second coil 680 into a second DC power supply voltage for powering the inner loop circuit unit.

[0043] Understandably, since the connector is in a rotating state, the inner ring circuit unit provided at the connector is difficult to be directly connected to the external power supply, and the installation cost of the electric slip ring is relatively high. In this embodiment, the fixed housing and outer ring circuit unit that need to be provided are combined with the DC-AC conversion circuit and the DC-AC conversion circuit to better solve the power supply problem of the inner ring circuit unit.

[0044] In this embodiment, the AC-DC conversion circuit includes a first terminal, a full-bridge rectifier circuit and a first voltage stabilizing circuit connected in sequence. The first terminal is used to connect to the second coil 680, and the second DC supply voltage is +5V.

[0045] Specifically, combined Figure 2 The AC-DC conversion circuit in this embodiment can stably convert the coupling voltage at the second coil into a second linear power supply voltage.

[0046] In this embodiment, the outer ring circuit unit has a first DC-DC conversion circuit, the first DC-DC conversion circuit includes a second voltage stabilizing circuit, the second voltage stabilizing circuit is used to convert the first DC supply voltage into a third DC supply voltage of +12V, and the third DC supply voltage is used to power the outer ring circuit unit.

[0047] In this embodiment, the DC-AC conversion circuit includes an operational amplifier circuit and a MOS transistor. The operational amplifier circuit is used to generate a square wave drive signal for driving the MOS transistor. The MOS transistor is used to convert a first DC supply voltage into a first AC supply voltage and output it. The first DC supply voltage is +24V, and the effective value of the first AC supply voltage is approximately 20V.

[0048] Combine Figure 3 In this embodiment, the first DC power supply voltage can, on the one hand, power the outer loop circuit unit after passing through the first DC-DC conversion circuit, and on the other hand, can generate a first AC power supply voltage for coil coupling through the DC-AC conversion circuit.

[0049] In this embodiment, the inner ring circuit unit has a strain detection bridge circuit, a front-end amplifier circuit, a V / F conversion circuit and an infrared emission circuit connected in sequence; the strain detection bridge circuit is used to detect the torque load force at the detected rotating shaft, the front-end amplifier circuit is used to amplify the signal generated by the strain detection bridge circuit, the V / F conversion circuit is used to convert the electrical signal amplified by the front-end amplifier circuit into a frequency signal, and the infrared emission circuit is used to generate a flashing light signal under the drive of the frequency signal.

[0050] Specifically, after the measurement system in this embodiment solves the power supply problem of the inner loop circuit unit through the DC-AC conversion circuit and the AC-DC conversion circuit, it can further measure the torque load force to be detected in real time through the strain detection bridge circuit, front-end amplifier circuit, V / F conversion circuit and infrared transmission circuit connected in sequence, and transmit it contactlessly through the optical signal of the infrared transmission circuit.

[0051] In this embodiment, the infrared emitting circuit includes an infrared diode driving circuit and a plurality of infrared diodes connected in parallel.

[0052] In this embodiment, the outer loop circuit unit has an infrared receiving circuit and a frequency output circuit connected in sequence. The infrared receiving circuit is used to detect the flashing light signal generated by the infrared transmitting circuit and output it to the frequency output circuit. The frequency output circuit is used to process the signal sent by the infrared receiving circuit to generate a detection signal, which is a frequency signal.

[0053] Combine Figure 6 and Figure 7 In this embodiment, the infrared receiving circuit and the frequency output circuit can stably receive and output the optical signal corresponding to the measured torque load force, so as to facilitate subsequent external circuit processing.

[0054] In this embodiment, the detection signal is a frequency signal, and the detection signal is output through an external circuit.

[0055] In this embodiment, the external circuit includes an F / V conversion circuit, which is used to convert the detection signal into a voltage signal and output the voltage signal.

[0056] Example 2

[0057] The same as Example 1, except that the detection device in this embodiment includes a device body 500, which includes a connector 510 hollowed out along the axial direction. The first end of the connector 510 is used to connect to the power shaft of the driving unit, and the second end of the connector 510 is used to connect to the load shaft to be measured.

[0058] A hollow mounting opening 610 is formed near the first end of the connector 510; a strain beam 620 is provided at the mounting opening 610, and the two ends of the strain beam 620 are connected to the side walls of the mounting opening 610. A resistance strain gauge 630 is installed in the middle of the strain beam 620, and the resistance strain gauge 630 is used to connect to the strain bridge; the resistance strain gauge 630 is also used to deform under force to generate a voltage change on the strain bridge; the voltage change is used to correspond to the torque load force on the connector 510.

[0059] Specifically, when the device body 500 in this embodiment is in use, the first end and the second end of the connecting body 510 are first connected to the power shaft of the driving part and the load shaft to be measured respectively; that is, the connecting body 510 itself can play a role similar to a coupling to realize transmission between the driving part and the load shaft.

[0060] At the same time, the connector 510 and the load shaft can rotate synchronously under the drive of the driver, and the torque at the connector 510 can effectively reflect the torque of the load shaft. Furthermore, in this embodiment, a strain gauge 630 is used to form a strain bridge to measure the torque at the connector 510. To achieve more sensitive torque measurement, the strain gauge 630 is mounted on a strain beam 620, which is located at the hollow mounting opening 610.

[0061] Compared to the solid portion, the hollowed-out mounting opening 610 area experiences a relatively greater rotational deformation during rotation, causing the strain gauge 630 to also deform significantly. The change in resistance of the strain gauge 630 also increases with the deformation, simultaneously increasing the voltage change across the strain bridge. This acts like an amplification mechanism, making the observation of rotational torque more sensitive and enabling the detected torque load to be more accurately reflected through changes in the electrical signal.

[0062] Furthermore, the two ends of the strain beam 620 are directly connected to the side walls of the mounting opening 610 , so that the deformation sensitivity of the strain beam 620 gradually increases from the two ends to the middle, and the middle portion is more susceptible to deformation. Therefore, in this embodiment, the resistance strain gauge 630 is selected to be disposed in the middle portion of the strain beam 620 to improve the sensitivity and accuracy of the measurement.

[0063] In this embodiment, the connecting body 510 includes a main shaft 640, and a first connecting groove 641 and a second connecting groove 642 are respectively formed at both ends of the main shaft 640. The first connecting groove 641 and the second connecting groove 642 respectively form the first end and the second end of the connecting body 510, and are respectively used to connect the power shaft and the load shaft of the driving part.

[0064] In this embodiment, a first flat notch 6411 is provided on the inner wall of the first connecting groove 641 for connecting to the driving unit power shaft, and a second flat notch 6421 is provided on the inner wall of the second connecting groove 642 for connecting to the load shaft.

[0065] Specifically, the first flat notch 6411 and the second flat notch 6421 can preferably form a stable connection between the main shaft 640 and the power shaft and load shaft of the driving unit.

[0066] In this embodiment, a mounting ring 650 is coaxially expanded outwardly at a position near the first end of the main shaft 640 , and a mounting opening 610 is formed through the mounting ring 650 ; a plurality of mounting openings 610 are provided and distributed in a circular pattern along the circumference of the mounting ring 650 .

[0067] In this embodiment, a plate 710 is formed on the mounting ring 650 above the strain beam 620 . A plurality of first threaded holes 720 are formed at both ends of the plate 710 . A plurality of second threaded holes 730 are also formed at both ends of the strain beam 620 .

[0068] In this embodiment, the first threaded holes 720 and the second threaded holes 730 correspond to each other one by one and are spaced apart circumferentially along the mounting ring 650 ; the first threaded holes 720 and the second threaded holes 730 are used to screw in adjustment bolts to adjust the tightness of the connection between the strain beam 620 and the plate body 710 .

[0069] Specifically, the hollow mounting opening 610 itself can increase the sensitivity of deformation, but based on different measurement requirements, an excessively large change in the strain bridge voltage is equivalent to a larger detection range; and when applied to different loads, the torque itself is large, and after the deformation is amplified by the hollow mounting opening 610, it may cause the voltage transformation to be excessive, which in turn will lead to poor accuracy of the measurement results and low detection precision.

[0070] Therefore, in this embodiment, a plate body 710 is provided, and the first threaded hole 720 on the plate body 710 can cooperate with the second threaded hole 730 on the strain beam 620; based on the aforementioned "the two ends of the strain beam 620 are directly connected to the side walls of the mounting port 610, so that the deformation sensitivity of the strain beam 620 gradually increases from the two ends to the middle", the deformation condition of the strain beam 620 is further adjusted and refined, and by screwing adjusting bolts into the first threaded holes 720 and the second threaded holes 730 at different positions, the deformation amount at the middle of the strain beam 620 can be reduced to adapt to different measurement requirements; thereby improving the accuracy of detection.

[0071] In this embodiment, the device body 500 also includes a cylindrical fixed shell 520 coaxial with the connecting body 510, and the main shaft 640 can be located in the fixed shell 520; the two ends of the fixed shell 520 are respectively connected to a first end plate 660 and a second end plate 670 in a circular shape; a plurality of first screw holes 661 for inserting positioning bolts are formed at the first end plate 660, and the first end plate 660 is used to be fixedly connected to the driving part; a bearing is provided in the middle of the second end plate 670, and the bearing is used to install the second end of the main shaft 640.

[0072] In this embodiment, a first annular mounting seat 810 is provided at a side wall of the first end plate 660 near the strain beam 620, and the first mounting seat 810 is coaxially arranged with the main shaft 640; an outer ring plate 820 is provided at the first mounting seat 810; a second mounting seat 1010 is coaxially formed at the main shaft 640, and an inner ring plate 1020 is provided at a side wall of the second mounting seat 1010 near the first mounting seat 810; the inner ring plate 1020 is used to power the strain bridge and transmit the signal generated by the voltage change to the outer ring plate 820, and the outer ring plate 820 is used to output the received signal to an external circuit.

[0073] Specifically, the fixed housing 520 is fixedly connected to the drive unit to form a stator, which secures the outer ring plate 820 and facilitates connection to an external power supply. The main shaft 640 moves with the load to form a rotor, which is used to measure the load to be tested. The inner ring plate 1020 cooperates with the strain bridge to output a voltage signal, which is then output to an external circuit through the outer ring plate 820 for integrated analysis, thereby corresponding to the measured torque.

[0074] In this embodiment, a code disk 830 for counting is provided on a side wall of the second mounting seat 1010 away from the first mounting seat 810 .

[0075] In this embodiment, a first coil 1110 is provided on the inner wall of the fixed shell 520, and the first coil 1110 is connected to the power supply and is used to supply power to the outer ring plate 820; a second coil 680 is coaxially arranged at the main shaft 640, and the position of the second coil 680 corresponds to that of the first coil 1110; the second coil 680 is coupled to the first coil 1110 and is used to supply power to the inner ring plate 1020.

[0076] It can be understood that the fixed housing 520 acts as a stator, and the outer ring plate 820 is powered by the first coil 1110, and the first coil 1110 is coupled with the second coil 680 to power the second coil 680; the second coil 680 then powers the inner ring plate 1020;

[0077] Therefore, the device body 500 in this embodiment can stably realize the installation, fixation, power supply and signal transmission of the outer ring plate 820 and the inner ring plate 1020 by fixing the housing 520 (stator) and the main shaft 640 (rotor).

[0078] Example 3

[0079] This embodiment provides a test method based on the detection system in Example 1 and the detection device in Example 2. In this embodiment, a stabilized power supply is used to provide a 24V DC power supply for the entire system; the second end of the spindle 640 is fixed on a bench vise, and a manual torque wrench is used at the first end as the input torque of the drive unit; and a high-precision digital multimeter is used to measure the output voltage.

[0080] Two sets of data were measured, with the torque intervals of the two sets of data being 2 and 5 respectively. Ten experiments were conducted for each input torque, and the output voltage was recorded and filled in the table. The average value of the 10 times was taken as the final output result.

[0081] In order to explore the relationship between input torque and output voltage from the measured data, a nonlinear fitting method is used to fit the input and output data using a polynomial. In this project, a second-order polynomial is used, as shown in formula (1).

[0082]

[0083] Based on the measured data, the least squares fitting method is used and the results are:

[0084] When the interval is 2: a=3.04616868084370e-06, b=0.0171205681134474c=2.40820212494671

[0085] When the interval is 5: a=-3.41412354415450e-05, b=0.0209271148459384c=2.33573395252838

[0086] By analyzing the experimental results, we can see that the quadratic coefficient a under the two intervals is very small, so the measurement data shows that there is an approximate linear relationship between the input torque (measured torque) and the output voltage. The intuitive results are as follows: Figure 15 and 16 The figure shows the relationship curve between the actual measurement data and the relationship curve between the input and output after fitting. It can be seen intuitively from the curve that the input torque and the output voltage satisfy an approximately linear relationship; that is, the detection linearity of the detection system in this embodiment is high and the measurement accuracy is good.

[0087] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0088] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The embodiments shown in the embodiments are only part of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and, without departing from the purpose of the present invention, designs a structure and embodiment similar to the technical solution without creatively designing, they shall fall within the scope of protection of the present invention.

Claims

1. A torque measuring device, characterized in that: The device comprises a device body (500), wherein the device body (500) comprises a connecting body (510) hollowed out along the axial direction, wherein a first end of the connecting body (510) is used to be connected to a power shaft of a driving part, and a second end of the connecting body (510) is used to be connected to a load shaft to be measured; A hollowed-out mounting opening (610) is formed near the first end of the connector (510); a strain beam (620) is provided at the mounting opening (610); both ends of the strain beam (620) are connected to the side walls of the mounting opening (610); a resistance strain gauge (630) is installed at the middle of the strain beam (620); the resistance strain gauge (630) is used to connect to a strain bridge; the resistance strain gauge (630) is also used to deform under force to generate a voltage variation on the strain bridge; the voltage variation is used to correspond to the torque load force on the connector (510).

2. A torque measuring device according to claim 1, characterized in that: The connecting body (510) includes a main shaft (640), and a first connecting groove (641) and a second connecting groove (642) are respectively formed at both ends of the main shaft (640). The first connecting groove (641) and the second connecting groove (642) respectively form the first end and the second end of the connecting body (510), and are respectively used to connect the driving part power shaft and the load shaft.

3. A torque measuring device according to claim 2, characterized in that: The inner wall of the first connecting groove (641) is provided with a first flat notch (6411) for connecting to the output end of the driving part for transmission, and the inner wall of the second connecting groove (642) is provided with a second flat notch (6421) for connecting to the load part for transmission.

4. A torque measuring device according to claim 2, characterized in that: A mounting ring (650) is coaxially expanded outwardly at a position near the first end of the main shaft (640), and a mounting opening (610) is formed through the mounting ring (650); a plurality of mounting openings (610) are provided and are distributed in a circular pattern along the circumference of the mounting ring (650).

5. The torque measuring device according to claim 4, characterized in that: The mounting ring (650) is formed with a plate body (710) at a position above the strain beam (620), and a plurality of first threaded holes (720) are formed at both ends of the plate body (710); and a plurality of second threaded holes (730) are also formed at both ends of the strain beam (620).

6. The torque measuring device according to claim 5, characterized in that: The first threaded hole (720) and the second threaded hole (730) correspond to each other one by one and are spaced apart along the circumference of the mounting ring (650); the first threaded hole (720) and the second threaded hole (730) are used to screw in adjustment bolts to adjust the degree of connection tightness between the strain beam (620) and the plate body (710).

7. The torque measuring device according to claim 2, characterized in that: The device body (500) further includes a cylindrical fixed housing (520) coaxial with the connecting body (510), and the main shaft (640) can be located in the fixed housing (520); the two ends of the fixed housing (520) are respectively connected to a first end plate (660) and a second end plate (670) in a circular shape; the first end plate (660) is formed with a plurality of first screw holes (661) for inserting positioning bolts, and the first end plate (660) is used to be fixedly connected to the driving part; a bearing is provided in the middle of the second end plate (670), and the bearing is used to install the second end of the main shaft (640).

8. The torque measuring device according to claim 7, characterized in that: A first annular mounting seat (810) is provided at a side wall of the first end plate (660) near the strain beam (620), and the first mounting seat (810) is coaxially arranged with the main shaft (640); an outer ring plate (820) is provided at the first mounting seat (810); a second mounting seat (1010) is coaxially formed at the main shaft (640), and an inner ring plate (1020) is provided at a side wall of the second mounting seat (1010) near the first mounting seat (810); the inner ring plate (1020) is used to supply power to the strain bridge and transmit the signal generated by the voltage change to the outer ring plate (820), and the outer ring plate (820) is used to output the received signal to an external circuit.

9. The torque measuring device according to claim 8, characterized in that: A code disk (830) for counting is provided on a side wall of the second mounting seat (1010) which is far from the first mounting seat (810).

10. The torque measuring device according to claim 8, characterized in that: A first coil (1110) is provided on the inner wall of the fixed housing (520), and the first coil (1110) is connected to electricity and used to supply power to the outer ring plate (820); a second coil (680) is coaxially provided on the main shaft (640), and the position of the second coil (680) corresponds to that of the first coil (1110); the second coil (680) is coupled to the first coil (1110) and used to supply power to the inner ring plate (1020).

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