A drive shaft torque measuring device

Abstract

The application relates to a transmission shaft torque measuring device, which comprises a transmission shaft, a strain gauge, a wire, an induction coil, a support, an additional magnetic field, a receiving circuit, a shell, a bearing, a measuring controller, the transmission shaft is installed in the shell through the bearing, the strain gauge is pasted on the outer surface of the transmission shaft, the induction coil is fixed on the transmission shaft through the support, the strain gauge and the induction coil are connected into a closed loop circuit through the wire, the additional magnetic field and the receiving circuit are fixed in the shell, the measuring controller is located outside the shell, and the measuring controller is connected with the receiving circuit. When the transmission shaft is subjected to the action of torque, the strain gauge is deformed, the resistance changes, under the action of the additional magnetic field, the current in the closed loop circuit also changes, the induction coil transmits the current change to the receiving circuit, so that the measurement of the transmission shaft torque is realized. The technical scheme provided by the application is compact in size and can realize non-contact torque measurement.

Description

Technical Field

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

[0002] Shaft transmission is widely used in various industrial fields such as transportation, shipping, aerospace, and energy. Torque is the basic load form of the drive shaft and is also the weight indicator of the drive shaft's power output. Monitoring torque can obtain the power, transmission efficiency, and motion status of the shaft system, which is very necessary to improve the overall reliability of the shaft transmission and ensure work safety.

[0003] At present, the most widely used torque monitoring device is the strain gauge on the surface of the drive shaft, which uses a conductive slip ring to transmit the measurement signal output by the strain gauge. This method of transmitting the measurement signal is more suitable for occasions where the drive shaft speed is not high. For drive shafts with higher speeds, a static torque measurement device plus a dedicated high-speed slip ring can generally be used for measurement. Some scholars have also proposed non-contact measurement methods such as photoelectric and magnetoelectric methods, but these measurement methods often have problems such as high cost, complex measurement device structure, large size, and the need for dedicated instruments to be used.

[0004] Therefore, for drive shafts with higher speeds, it is necessary to develop a torque measuring device that is simple and compact in structure, does not require special instruments, and has high reliability and low cost. Summary of the Invention

[0005] To solve the above problems, the present invention provides a transmission shaft torque measurement device, which converts the resistance change of the strain gauge into current change by utilizing an additional magnetic field, and then uses an induction coil to transmit the current change to a receiving circuit. The receiving circuit undergoes analog-to-digital conversion and signal processing, and then transmits the signal to a measurement controller, thereby realizing the measurement of the transmission shaft torque.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A transmission shaft torque measuring device includes a transmission shaft, a strain gauge, a wire, an induction coil, a bracket, an additional magnetic field, a receiving circuit, a housing, a bearing, and a measurement controller. The transmission shaft is mounted in the housing via the bearing, the strain gauge is adhered to the outer surface of the transmission shaft, the induction coil is fixed to the transmission shaft via the bracket, the strain gauge and the induction coil are connected to form a closed-loop circuit via a wire, the additional magnetic field and the receiving circuit are both fixed in the housing, and the measurement controller is located outside the housing and is connected to the receiving circuit.

[0008] Furthermore, an end cover and a sealing ring are provided on one side of the housing to seal the transmission shaft.

[0009] Furthermore, an electrical interface is provided on the surface of the housing for measuring signal transmission and power supply between the controller and the receiving circuit.

[0010] Furthermore, the strain gauge is a rectangular gauge, and the long side of the strain gauge forms an angle of 45° with the axis of the transmission shaft.

[0011] Furthermore, the strain gauge is away from the bracket, and the additional magnetic field only covers the area where the strain gauge is located, so as to ensure that a part of the closed circuit cuts the magnetic field and generates current.

[0012] Furthermore, the bracket is fixed to the transmission shaft by screws, and a clamp is provided on the surface of the bracket to fix the induction coil.

[0013] Furthermore, the receiving circuit includes a receiving coil, an analog-to-digital conversion module, a signal processing module, and a power supply module. The receiving coil is connected to the signal processing module through the analog-to-digital conversion module, and the power supply module is connected to the analog-to-digital conversion module and the signal processing module.

[0014] Furthermore, the position of the receiving coil corresponds to the induction coil, so as to achieve coupling between the receiving coil and the induction coil.

[0015] The beneficial effects of the present invention are as follows: fewer measuring components are fixed on the transmission shaft, which has little impact on the operation of the transmission shaft; mutual induction technology is used between the passive closed-loop circuit composed of strain gauges, induction coils and wires and the receiving circuit to realize the transmission of current signals and wire-free connection, thereby avoiding the problem of wire entanglement when the transmission shaft rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the transmission shaft torque measuring device of the present invention;

[0017] Figure 2 Schematic diagram of the torque measurement signal transmission process;

[0018] In the figure, 1. transmission shaft; 2. strain gauge; 3. wire; 4. induction coil; 5. bracket; 6. additional magnetic field; 7. receiving circuit; 8. housing; 9. bearing; 10. measurement controller; 501. screw; 502. clamp; 701. receiving coil; 702. analog-to-digital conversion module; 703. signal processing module; 704. power supply module; 801. electrical interface; 802. end cover; 803. sealing ring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Reference Figure 1 , as shown in 2, a transmission shaft torque measuring device is located at the end of the transmission shaft, including a transmission shaft 1, a strain gauge 2, a wire 3, an induction coil 4, a bracket 5, an additional magnetic field 6, a receiving circuit 7, a housing 8, a bearing 9 and a measurement controller 10.

[0021] One end of the transmission shaft 1 is fixed in the housing 8 through a bearing 9, the strain gauge 2 is adhered to the outer surface of the transmission shaft 1, the induction coil 4 is fixed to the transmission shaft 1 through a bracket 5, the strain gauge 2 and the induction coil 4 are connected to form a closed loop circuit through a wire 3, the additional magnetic field 6 and the receiving circuit 7 are both fixed in the housing 8, the measurement controller 10 is located outside the housing 8, and an electrical interface 801 is provided on the surface of the housing for signal transmission and power supply between the measurement controller 10 and the receiving circuit 7.

[0022] In the optimized solution, the housing 8 is provided with an end cover 802 and a sealing ring 803 to seal with the transmission shaft 1 .

[0023] In the optimized solution, the strain gauge 2 is a rectangular gauge, and the long side of the strain gauge 2 forms an angle of 45° with the axis of the transmission shaft 1.

[0024] In the optimized solution, the strain gauge 2 is away from the bracket 5, and the additional magnetic field 6 only covers the area where the strain gauge 2 is located, so as to ensure that part of the closed circuit cuts the magnetic field and generates current.

[0025] In the optimized solution, the bracket 5 is provided with screws 501 to be fixed to the transmission shaft 1 , and a clamp 502 is provided on the surface of the bracket 5 to fix the induction coil 4 .

[0026] In the optimized solution, the receiving circuit 7 includes a receiving coil 701, an analog-to-digital conversion module 702, a signal processing module 703, and a power supply module 704. The receiving coil 701 is connected to the signal processing module 703 via the analog-to-digital conversion module 702, and the power supply module 704 is connected to the analog-to-digital conversion module 702 and the signal processing module 703.

[0027] In an optimized solution, the position of the receiving coil 701 corresponds to the induction coil 4 , so as to achieve coupling between the receiving coil 701 and the induction coil 4 .

[0028] The working principle of the present invention is as follows: the strain gauge 2 and the induction coil 4 are connected to form a passive closed-loop circuit, and a part of the passive closed circuit is placed in an additional magnetic field 6. During the rotation of the transmission shaft 1, a part of the closed circuit cuts the magnetic flux lines, and the closed circuit generates current. The torque of the transmission shaft causes the resistance of the strain gauge 2 and the current of the closed circuit to change. The induction coil 4 transmits the current change to the receiving circuit 7. The receiving circuit 7 undergoes analog-to-digital conversion and signal processing, and then transmits the signal to the measurement controller 10 to realize the measurement of the transmission shaft torque.

[0029] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A transmission shaft torque measuring device, characterized in that: It includes a transmission shaft, a strain gauge, a wire, an induction coil, a bracket, an additional magnetic field, a receiving circuit, a housing, a bearing, and a measurement controller. The transmission shaft is installed in the housing through the bearing, the strain gauge is adhered to the outer surface of the transmission shaft, the induction coil is fixed to the transmission shaft through the bracket, the strain gauge and the induction coil are connected to form a closed-loop circuit through a wire, the additional magnetic field and the receiving circuit are both fixed in the housing, the measurement controller is located outside the housing, and the measurement controller is connected to the receiving circuit; the strain gauge is away from the bracket, and the additional magnetic field only covers the area where the strain gauge is located to ensure that a part of the closed circuit cuts the magnetic field and generates current; the receiving circuit includes a receiving coil, an analog-to-digital conversion module, a signal processing module, and a power supply module. The receiving coil is connected to the signal processing module through the analog-to-digital conversion module, and the power supply module is connected to the analog-to-digital conversion module and the signal processing module.

2. The transmission shaft torque measuring device according to claim 1, characterized in that: An end cover and a sealing ring are provided on one side of the shell to seal the transmission shaft.

3. The transmission shaft torque measuring device according to claim 1, characterized in that: An electrical interface is provided on the surface of the housing for measuring signal transmission and power supply between the controller and the receiving circuit.

4. The transmission shaft torque measuring device according to claim 1, characterized in that: The strain gauge is a rectangular gauge, and the long side of the strain gauge forms an angle of 45° with the axis of the transmission shaft.

5. The transmission shaft torque measuring device according to claim 1, characterized in that: The bracket is fixed to the transmission shaft by screws, and a clamp is provided on the surface of the bracket to fix the induction coil.

6. The transmission shaft torque measuring device according to claim 1, characterized in that: The position of the receiving coil corresponds to the induction coil, so as to achieve coupling between the receiving coil and the induction coil.

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