Rotor torsion testing device

Abstract

The utility model relates to the technical field of torque measuring devices, in particular to a rotor torsion testing device which comprises a shell and a rotating shaft, and a strain gauge and a slip ring are arranged on the rotating shaft. The rotating shaft comprises an input shaft, an elastic shaft and an output shaft, the input shaft, the elastic shaft and the output shaft are provided with central channels, and the elastic shaft is provided with adsorption channels used for improving the combination effect of the strain gauges and the elastic shaft at the bottoms of the strain gauges. By reducing the diameter of the elastic rod, the centrifugal force on the strain gauges during high-speed rotation of the rotor is reduced. The problem that the combination effect of the strain gauges and the elastic rods is reduced after the rotor rotates is avoided. Meanwhile, through the arrangement of the adsorption channel, the negative pressure below the strain gauge can be improved, so that the strain gauge is more attached to the elastic rod. The torque measuring device has the advantages of high measuring precision and stable structure, and can be widely applied to torque measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of torque measuring devices, and specifically relates to a rotor torque testing device. Background Art

[0002] A torque measuring device is a device used to measure the torque (moment) generated by an object during rotation or torsion. It usually consists of a sensor, a data processing system, etc., and can monitor and record the magnitude and direction of torque in real time. Torque measuring devices are mainly used to evaluate the torque exerted by mechanical equipment, tools or components during rotation or torsion, ensure that the equipment operates normally within the designed torque range, and help with the quality control and maintenance of mechanical components.

[0003] Torque measuring devices have various categories, including: 1. Mechanical torque measuring devices, which measure torque by using the deformation of a lever system or a spring sheet. This device has a simple structure and low cost, but low precision and limited measurement range. 2. Magnetoelectric torque measuring devices, which measure the change in voltage using the change in magnetic field to calculate torque. They have high measurement precision, fast response speed, and are suitable for dynamic measurement, but are costly and complex to install. 3. Resistive torque measuring devices, which convert torque into resistance change using the deformation of a resistance strain gauge. They have high precision and good stability and are suitable for high-precision measurement. However, the strain gauge is fixed on the elastic shaft by means of glue bonding, so the measurement data is easily affected by the bonding effect. In addition, for a high-speed rotating rotor, the strain gauge bonded to the elastic shaft will bear a large centrifugal force, resulting in a reduced bonding effect between the strain gauge and the elastic shaft. Summary of the Utility Model

[0004] The utility model aims to provide a rotor torque testing device to solve the problems of poor bonding effect of the strain gauge and large influence of centrifugal force in the existing resistive torque measuring device, and at the same time optimize the structural design to improve the measurement precision and stability.

[0005] To solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0006] A rotor torque testing device includes a housing and a rotating shaft. The rotating shaft is connected to the housing through a bearing. A strain gauge and a slip ring are provided on the rotating shaft. A signal processing component and a data interface are provided on the housing. The rotating shaft includes an input shaft, an elastic shaft and an output shaft. The two ends of the elastic shaft are respectively connected to the input shaft and the output shaft. The strain gauge is provided on the elastic shaft.

[0007] Central channels are provided on the input shaft, the elastic shaft and the output shaft. The two ends of the central channel extend to the side parts of the input shaft and the output shaft. The elastic shaft is provided with an adsorption channel at the bottom of the strain gauge for increasing the bonding effect between the strain gauge and the elastic shaft.

[0008] A wire is provided between the strain gauge and the slip ring. The wire passes through the central channel, and a second wire connected to the signal processing component is provided on the top of the slip ring.

[0009] The slip ring is provided on the output shaft, and the diameter of the output shaft is greater than that of the input shaft, which is greater than that of the elastic shaft.

[0010] Optionally, a placement groove is provided on the elastic shaft, the strain gauge is provided in the placement groove, the top of the adsorption channel is provided at the center of the placement groove, and a support net is provided at the top to prevent the strain gauge from entering the placement groove.

[0011] Optionally, a joint placement groove is provided on one side of the placement groove. The joint placement groove is used to place the joint of the strain gauge. The joint is used to connect the strain gauge and the wire. A through hole communicating with the central channel is provided at the bottom of the joint placement groove, and the wire penetrates into the central channel from the through hole.

[0012] Optionally, a rotary cover is provided on the elastic shaft. A threaded portion is provided at the distal end of the joint placement groove. An internal thread matching the threaded portion is provided inside the rotary cover. A limiting block is provided on the side of the joint placement groove close to the placement groove.

[0013] After the rotary cover moves, the joint is pressed in the joint placement groove.

[0014] Optionally, connecting portions are provided at corresponding positions at both ends of the elastic shaft and the input shaft and the output shaft. Assembly holes are provided on the connecting portions. The connecting portions on the elastic shaft, the input shaft and the output shaft are connected and fixed by screws provided on the assembly holes.

[0015] Optionally, an arc-shaped transition portion is provided between the connecting portion and the elastic shaft.

[0016] Optionally, bearing seats are provided on the input shaft and the output shaft, and key grooves are provided at the ends of the input shaft and the output shaft.

[0017] Optionally, the slip ring includes a stationary ring and a rotating ring. The rotating ring rotates synchronously with the output shaft. The stationary ring is sleeved outside the rotating ring and is electrically connected to the corresponding rotating ring through a contact piece.

[0018] The rotating ring is electrically connected to the strain gauge through a wire.

[0019] Optionally, the signal processing component is provided inside the housing, and the data interface is provided on the top of the housing.

[0020] The advantages of the present utility model are as follows:

[0021] 1. The utility model reduces the diameter of the elastic rod to reduce the centrifugal force on the strain gauge when the rotor rotates at high speed, thus avoiding the problem of the reduced bonding effect between the strain gauge and the elastic rod after the rotor rotates. At the same time, the utility model improves the negative pressure below the strain gauge by providing an adsorption channel, so that the strain gauge fits more closely to the elastic rod.

[0022] 2. The connection part and the elastic shaft of the utility model adopt an arc-shaped transition part design, which can effectively disperse the local stress, prevent the elastic shaft from breaking due to stress concentration, and extend the service life of the device. The diameter of the output shaft of the utility model is larger than that of the input shaft, which can optimize the air flow direction in the central channel. While providing negative pressure for the adsorption channel, the air can also take out the heat generated by the friction of the slip ring, avoiding the problem that the high temperature at the slip ring affects the service life of the device and the measurement accuracy of the strain gauge. Brief Description of the Drawings

[0023] Figure 1 It is a structural diagram of a rotor torque testing device in Embodiment 1.

[0024] Figure 2 It is a structural diagram inside a rotor torque testing device in Embodiment 1.

[0025] Figure 3 It is a structural diagram of the central channel in a rotor torque testing device in Embodiment 1.

[0026] Figure 4 It is a structural diagram of the rotating shaft in a rotor torque testing device in Embodiment 1.

[0027] Figure 5 It is an exploded view of the rotating shaft in a rotor torque testing device in Embodiment 1.

[0028] Figure 6 It is a structural diagram of the elastic shaft in a rotor torque testing device in Embodiment 1.

[0029] Figure 7 It is a structural diagram of the adsorption channel in a rotor torque testing device in Embodiment 1.

[0030] Figure 8 It is a structural diagram of the connection part in a rotor torque testing device in Embodiment 1.

[0031] Figure 9 It is a structural diagram of the slip ring in a rotor torque testing device in Embodiment 1.

[0032] Labels in the figure:

[0033] 1 - housing, 11 - signal processing component, 12 - data interface; 2 - rotating shaft, 21 - input shaft, 22 - elastic shaft, 221 - placement groove, 222 - support mesh, 223 - connector placement groove, 224 - through hole, 225 - threaded portion, 226 - limit block, 23 - output shaft, 24 - central channel, 241 - opening, 25 - adsorption channel, 26 - screw cap, 27 - transition portion; 3 - bearing; 4 - strain gauge, 41 - connector; 5 - slip ring, 51 - second wire, 52 - stationary ring, 53 - rotating ring, 54 - contact piece; 6 - wire; 7 - connecting portion, 71 - assembly hole; 8 - bearing seat; 9 - keyway. Detailed implementation mode

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0035] Embodiment 1

[0036] This embodiment discloses a rotor torque testing device, as Figure 1 and Figure 2 shown, which includes a housing 1 and a rotating shaft 2. The rotating shaft 2 is connected to the housing 1 through a bearing 3. A strain gauge 4 and a slip ring 5 are provided on the rotating shaft 2, and a signal processing component 11 and a data interface 12 are provided on the housing 1.

[0037] As Figure 3 , 4 , 5 shown, the rotating shaft 2 includes an input shaft 21, an elastic shaft 22 and an output shaft 23. Both ends of the elastic shaft 22 are respectively connected to the input shaft 21 and the output shaft 23; the strain gauge 4 is provided on the elastic shaft 22.

[0038] Central channels 24 are provided on the input shaft 21, the elastic shaft 22 and the output shaft 23. Both ends of the central channel 24 extend to the side parts of the input shaft 21 and the output shaft 23, and openings 241 communicating with the external atmosphere are formed on the side parts of the input shaft 21 and the output shaft 23. The elastic shaft 22 is provided with an adsorption channel 25 at the bottom of the strain gauge 4 for increasing the bonding effect between the strain gauge 4 and the elastic shaft 22.

[0039] As Figure 6 and 7 shown, the elastic shaft 22 is provided with a placement groove 221, the strain gauge 4 is provided in the placement groove 221, the top of the adsorption channel 25 is provided at the center position of the placement groove 221, and a support mesh 222 for preventing the strain gauge 4 from entering the adsorption channel 25 is provided at the top.

[0040] AsFigure 3 As shown, the diameter of the output shaft 23 is greater than that of the input shaft 21 which is greater than that of the elastic shaft 22. The diameter of the elastic shaft 22 is the smallest, making the strain gauge 4 on it bear the minimum centrifugal force at the same rotational speed. Therefore, the bonding effect between the strain gauge 4 and the placement groove 221 can be effectively improved. At the same time, since the diameter of the output shaft 23 is greater than that of the input shaft 21, the air flow rate at the opening 241 of the output shaft 23 is greater than that at the opening 241 of the input shaft 21. Therefore, the pressure at the opening 241 of the output shaft 23 is smaller. Air can enter from the opening 241 of the input shaft 21, pass through the central channel 24, and flow out from the opening 241 of the output shaft 43.

[0041] When the air flows through the adsorption channel 25 in the central channel 24, a negative pressure can be formed at the adsorption channel 25. Thereby improving the bonding effect between the strain gauge 4 and the elastic shaft 22.

[0042] As Figure 2 、 7 、9 shown, there is a wire 6 between the strain gauge 4 and the slip ring 5, and the wire 6 passes through the central channel 24. The top of the slip ring 5 is provided with a second wire 51 connected to the signal processing component 11.

[0043] As Figure 6 and Figure 7 shown, a joint placement groove 223 is provided on one side of the placement groove 221. The joint placement groove 223 is used to place the joint 41 of the strain gauge 4. The joint 41 is used to connect the strain gauge 4 and the wire 6. A through hole 224 communicating with the central channel 24 is provided at the bottom of the joint placement groove 223, and the wire 6 penetrates into the central channel 24 from the through hole 224. A seal is provided on the through hole 224 to ensure the airtightness of the central channel 24.

[0044] A screw cap 26 is provided on the elastic shaft 22. A threaded portion 225 is provided at the distal end of the joint placement groove 223. The inner part of the screw cap 26 is provided with an internal thread matching the threaded portion 225. A limiting block 226 is provided on the side of the joint placement groove 223 close to the placement groove 221; after moving the screw cap 26, the screw cap 26 moves above the joint 41 and presses the joint 41 in the joint placement groove 223.

[0045] As Figure 8 shown, connection parts 7 are provided at corresponding positions at both ends of the elastic shaft 22 and the input shaft 21 and the output shaft 23. Assembly holes 71 are provided on the connection parts 7 in a corresponding manner. The connection parts 7 on the elastic shaft 22, the input shaft 21, and the output shaft 23 are connected and fixed by screws provided on the assembly holes 71. Sealing rings are provided on the connection parts 7 at positions corresponding to the central channel 24, thereby ensuring the airtightness of the central channel.

[0046] A transition portion 27 which is arc-shaped is provided between the connecting portion 7 and the elastic shaft 22. The transition portion 27 can avoid generating large stresses locally on the elastic shaft 22 and prevent the elastic shaft 22 from breaking.

[0047] As Figure 9 shown, the slip ring 5 is provided on the output shaft 23. The slip ring 5 includes a stationary ring 52 and a rotating ring 53. The rotating ring 53 rotates synchronously with the output shaft 23. The stationary ring 52 is sleeved outside the rotating ring 53 and is electrically connected to the corresponding rotating ring 53 through a contact piece 54. The rotating ring 53 is electrically connected to the strain gauge 4 through a wire 6.

[0048] As Figure 1 and Figure 2 shown, the signal processing component 11 is provided inside the housing 1, and the data interface 12 is provided on the top of the housing 1. Bearing seats 8 are provided on the input shaft 21 and the output shaft 23, and key grooves 9 are provided at the ends of the input shaft 21 and the output shaft 23.

[0049] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A rotor torque test device, comprising a housing and a rotating shaft, wherein the rotating shaft is connected to the housing through a bearing, a strain gauge and a slip ring are arranged on the rotating shaft, and a signal processing component and a data interface are arranged on the housing, characterized in that: The rotating shaft comprises an input shaft, an elastic shaft and an output shaft, and the two ends of the elastic shaft are respectively connected to the input shaft and the output shaft; the strain gauge is arranged on the elastic shaft; The input shaft, the elastic shaft and the output shaft are provided with a central channel, both ends of which extend to the sides of the input shaft and the output shaft, and the elastic shaft is provided with an adsorption channel at the bottom of the strain gauge for increasing the combination effect of the strain gauge and the elastic shaft; A wire is provided between the strain gauge and the slip ring, the wire passes through the central channel, and a second wire connected to the signal processing component is provided on the top of the slip ring; The slip ring is arranged on the output shaft, and the diameter of the output shaft is larger than the diameter of the input shaft and larger than the diameter of the elastic shaft.

2. A rotor torque testing device according to claim 1, characterized in that: The elastic shaft is provided with a placement groove, the strain gauge is arranged in the placement groove, the top of the adsorption channel is arranged at the center of the placement groove, and a support net is provided on the top to prevent the strain gauge from entering the adsorption channel.

3. A rotor torque testing device according to claim 2, characterized in that: A connector placement slot is provided on one side of the placement slot, and the connector placement slot is used to place a connector with a strain gauge, and the connector is used to connect the strain gauge and the wire. A through hole connected to the central channel is provided at the bottom of the connector placement slot, and the wire passes through the central channel from the through hole.

4. A rotor torque testing device according to claim 3, characterized in that: The elastic shaft is provided with a screw cap, the distal end of the joint placement slot is provided with a threaded portion, the inside of the screw cap is provided with an internal thread that matches the threaded portion, and the joint placement slot is provided with a limit block on one side close to the placement slot; After the rotary cover moves, the connector is pressed into the connector placement groove.

5. A rotor torque testing device according to claim 1, characterized in that: Connecting parts are provided at the two ends of the elastic shaft and at corresponding positions of the input shaft and the output shaft. Corresponding assembly holes are provided on the connecting parts. The connecting parts on the elastic shaft, the input shaft and the output shaft are connected and fixed by screws provided on the assembly holes.

6. A rotor torque testing device according to claim 5, characterized in that: An arc-shaped transition portion is provided between the connecting portion and the elastic shaft.

7. A rotor torque testing device according to claim 1, characterized in that: The input shaft and the output shaft are provided with bearing seats, and the ends of the input shaft and the output shaft are provided with keyways.

8. A rotor torque testing device according to claim 1, characterized in that: The slip ring includes a stationary ring and a dynamic ring, the dynamic ring rotates synchronously with the output shaft, the stationary ring is sleeved on the outside of the dynamic ring, and is electrically connected to the corresponding dynamic ring through a contact sheet; The moving ring is electrically connected to the strain gauge via a wire.

9. A rotor torque testing device according to claim 1, characterized in that: The signal processing component is arranged inside the shell, and the data interface is arranged on the top of the shell.

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