A large-range transmission shaft torque calibration tool driven by hydraulic pressure

Abstract

The utility model discloses a kind of large range transmission shaft torque calibration tool of hydraulic drive, comprising: fixed support, vertically fixed with connecting seat on the fixed support;Transmission shaft, one end of the transmission shaft is fixedly connected with connecting seat, and strain gauge detection module is provided on the transmission shaft;Hydraulic drive mechanism, its top end movably connected with calibration lever, the hydraulic drive mechanism is used to drive calibration lever swing, and the other end of the transmission shaft is fixedly connected with calibration lever.The utility model when carrying out torque calibration, does not need torque sensor, equipment cost is low, uses hydraulic drive mechanism to load, and calibration process is stable, impact is small, the moment of force that can load is big, under the condition of large range torque calibration, investment cost is low, and torque calibration operation in positive and negative direction can be carried out in a position, and overall volume is small.

Description

Technical Field

[0001] This utility model relates to the field of torque calibration tooling technology, and in particular to a hydraulically driven large-range transmission shaft torque calibration tooling. Background Technology

[0002] Before using strain gauges to test the torque of a drive shaft, it is necessary to calibrate the relationship between the strain signal and torque data of the drive shaft to determine the correspondence between the voltage signal collected from the strain gauge and the torque of the drive shaft.

[0003] Existing torque calibration methods use calibration levers and standard weights. If a power-driven torque sensor method is used, such as the one authorized in publication number CN102032967B, titled "Loader Driveshaft Torque Calibration Test Bench," it requires a drive power mechanism, gearbox, and torque sensor, resulting in a complex structure and high cost, especially for large-range torque sensors, which significantly increase equipment costs. Furthermore, during testing, rotational deviations in the driveshaft being calibrated cannot be visually represented, affecting calibration accuracy.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to overcome the limitations of existing technologies that require a drive power mechanism, gearbox, and torque sensor for torque calibration of drive shafts. These technologies are complex, costly, and especially expensive for large-range torque sensors. Furthermore, when the drive shaft to be calibrated experiences rotational deviation during testing, it cannot be visually represented, affecting the accuracy of the calibration. This invention provides a hydraulically driven, large-range drive shaft torque calibration fixture that eliminates the need for a torque sensor during torque calibration, resulting in lower equipment costs. It uses a hydraulic drive mechanism for loading, ensuring a stable calibration process with minimal impact and allowing for the application of large torques. In the case of large-range torque calibration, the investment cost is low, and torque calibration operations in both forward and reverse directions can be performed from a single location. The overall size is also compact.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model discloses a hydraulically driven, large-range transmission shaft torque calibration fixture, comprising:

[0008] A fixed support, on which a connecting seat is vertically fixed; a transmission shaft, one end of which is fixedly connected to the connecting seat, and a strain gauge detection module is provided on the transmission shaft; a hydraulic drive mechanism, the top end of which is movably connected to a calibration lever, the hydraulic drive mechanism being used to drive the calibration lever to swing, and the other end of the transmission shaft being fixedly connected to the calibration lever.

[0009] During calibration, the fixed support is secured, and an upward thrust or downward pull is applied to the calibration lever via a hydraulic drive mechanism. Specifically, the direction of the loading force is switched by adjusting the oil inlet and outlet direction of the hydraulic drive mechanism, completing the torque calibration in both directions. This method offers high calibration efficiency. The pressure value of the hydraulic drive mechanism and the voltage signal of the strain gauge detection module on the drive shaft are recorded. After applying multiple different loads, a set of hydraulic pressure and strain signal curves are obtained. Based on the cross-sectional area of ​​the hydraulic cylinder and the test pressure, the magnitude of the loading force of the hydraulic cylinder is calculated. Multiplying the loading force by the length of the calibration lever yields a set of torque data. Thus, a set of calibration torque and corresponding strain output signal data is obtained. Using a data fitting method, the relationship between the strain signal and the drive shaft torque value can be obtained.

[0010] By using a hydraulic drive mechanism as the input for calibration force, the loading force of the hydraulic cylinder is calculated based on the inner diameter and pressure of the hydraulic drive mechanism. This force is then multiplied by the length of the calibration lever and converted into the calibration torque. No torque sensor is required, resulting in low equipment cost. The calibration process is stable and has minimal impact due to the use of a hydraulic drive mechanism for loading. It can handle large torque loads and has low investment costs for large-range torque calibration. Furthermore, torque calibration operations in both directions can be performed at a single location, and the overall size is compact.

[0011] A deflection detection mechanism is also provided on the outer side of the calibration lever. This mechanism fits against the end of the drive shaft and displays the rotation of the drive shaft. By setting up the deflection detection mechanism, when the drive shaft deflects during torque calibration, the operator can visually detect it, preventing calibration errors.

[0012] Preferably, the hydraulic drive mechanism includes a hydraulic telescopic rod, with a connector fixed to its top end. The connector is rotatably connected to one end of a calibration lever via a rotating shaft. A pressure sensor for measuring the pressure value of the hydraulic telescopic rod is installed on the hydraulic telescopic rod. The hydraulic telescopic rod drives the calibration lever to rotate via the connector and the rotating shaft.

[0013] Preferably, the bottom end of the hydraulic telescopic rod is fixed with a connecting piece, and a support base is rotatably connected to the connecting piece.

[0014] Preferably, the deflection detection mechanism includes a side frame fixed to the outside of the calibration lever, a slide block slidably mounted on the side frame via a guide rail, a detection disk rotatably connected to the slide block, the detection disk being in contact with the outside of the end of the transmission shaft, an indicator mark being provided on the detection disk, and an indicator arrow being fixed on the slide block.

[0015] Preferably, a tension spring is connected between the slide and the side frame, and the elastic force of the tension spring is used to drive the detection disc to move towards the drive shaft.

[0016] Specifically, the side frame has a guide rail, and a slide block is slidably mounted in the guide rail. The slide block can slide and adjust on the guide rail. A tension spring connects the slide block and the side frame, ensuring that the detection disc connected to the slide block is in close contact with the outside of the drive shaft. When the drive shaft rotates, it synchronously drives the detection disc to rotate. At this time, the position of the indicator arrow and the indicator mark deviates, thus indicating when the drive shaft rotates and preventing calibration errors. The detection disc is installed through the guide rail and the slide block, and the slide block is driven by the tension spring. The detection disc can be adjusted by sliding the slide block, thus enabling the detection of deflection of drive shafts of different specifications, making it more convenient to use.

[0017] Preferably, the fixed support has fixing screw holes at each of its four corner positions for auxiliary fixing. The fixed support is fixed by fixing screws through the fixing screw holes.

[0018] Compared with the prior art, this utility model has the following advantages: This hydraulically driven large-range transmission shaft torque calibration fixture uses a hydraulic drive mechanism as the input of calibration force. Based on the inner diameter and pressure of the hydraulic drive mechanism, the loading force of the hydraulic cylinder is calculated, and then multiplied by the length of the calibration lever to convert it into calibration torque. It does not require a torque sensor, so the equipment cost is low. Using a hydraulic drive mechanism for loading, the calibration process is stable with little impact and can handle a large torque. In the case of large-range torque calibration, the investment cost is low. Furthermore, torque calibration operations in both directions can be performed at one location, and the overall size is small.

[0019] By setting up a deflection detection mechanism, when the drive shaft deflects during torque calibration, the operator can visually detect it, preventing calibration errors. The detection plate is installed through a guide rail and a slide, and the slide is driven by a tension spring. The detection plate can be adjusted by sliding the slide, enabling deflection detection of drive shafts of different specifications, making it more convenient to use. Attached Figure Description

[0020] Figure 1 This utility model provides an overall structural schematic diagram of a hydraulically driven large-range transmission shaft torque calibration fixture.

[0021] Figure 2 This utility model provides a schematic diagram of another angle of the structure of a hydraulically driven, large-range transmission shaft torque calibration fixture.

[0022] Figure 3 A front view of a hydraulically driven, large-range transmission shaft torque calibration fixture provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the deflection detection mechanism in this utility model.

[0024] Reference numerals in the attached drawings: 1. Fixed support; 11. Fixed screw hole; 2. Connecting seat; 3. Drive shaft; 31. Strain gauge detection module; 4. Calibration lever; 41. Rotating shaft; 42. Connecting head; 5. Hydraulic telescopic rod; 51. Connecting piece; 52. Support base; 53. Pressure sensor; 6. Deflection detection mechanism; 61. Side frame; 62. Guide rail; 63. Slide; 64. Detection plate; 65. Tension spring; 66. Indicator mark; 67. Indicator arrow. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This invention further illustrates the specific implementation of a hydraulically driven, large-range drive shaft torque calibration fixture, overcoming the limitations of existing technologies that require a drive power mechanism, gearbox, and torque sensor for torque calibration of drive shafts. These technologies are complex and costly, especially large-range torque sensors, which are extremely expensive. Furthermore, during testing, rotational deviations in the drive shaft cannot be visually represented, affecting calibration accuracy. This invention provides a hydraulically driven, large-range drive shaft torque calibration fixture that eliminates the need for a torque sensor, reducing equipment cost. It uses a hydraulic drive mechanism for loading, resulting in a stable calibration process with minimal impact and the ability to apply large torques. For large-range torque calibration, the investment cost is low, and torque calibration operations in both forward and reverse directions can be performed from a single location. The overall size is also compact. This invention's hydraulically driven, large-range drive shaft torque calibration fixture is not limited to the description in the following embodiments.

[0026] Please see Figure 1 - Figure 4 A hydraulically driven, large-range drive shaft torque calibration fixture, comprising:

[0027] A fixed support 1 is provided, with fixing screw holes 11 at each of its four corners for auxiliary fixation. The fixed support 1 is fixed by fixing screws 11 and fixing studs. A connecting seat 2 is vertically fixed on the fixed support 1. A transmission shaft 3 is fixedly connected to the connecting seat 2 at one end and a strain gauge detection module 31 is provided on the transmission shaft 3. A hydraulic drive mechanism is provided, with a calibration lever 4 movably connected to its top end. The hydraulic drive mechanism is used to drive the calibration lever 4 to swing. The other end of the transmission shaft 3 is fixedly connected to the calibration lever 4.

[0028] During calibration, the fixed support 1 is fixed, and an upward thrust is applied to the calibration lever 4 via the hydraulic drive mechanism to calibrate the counterclockwise torque, or a downward pull is applied to calibrate the clockwise torque. Specifically, by adjusting the oil inlet and outlet direction of the hydraulic drive mechanism, the direction of the loading force is switched, completing the torque calibration in both directions. The calibration efficiency is high. The pressure value of the hydraulic drive mechanism and the voltage signal of the strain gauge detection module 31 on the transmission shaft 3 are tested and recorded. After loading multiple different loads, a set of hydraulic pressure and strain signal curves are obtained. Based on the cross-sectional area of ​​the hydraulic cylinder and the test pressure, the magnitude of the loading force of the hydraulic cylinder is calculated. The loading force is multiplied by the length of the calibration lever 4 to obtain a set of torque data. Thus, a set of calibration torque and corresponding strain output signal data is obtained. Using a data fitting method, the relationship between the strain signal and the transmission shaft torque value can be obtained.

[0029] By using a hydraulic drive mechanism as the input for calibration force, the loading force of the hydraulic cylinder is calculated based on the inner diameter and pressure of the hydraulic drive mechanism. This force is then multiplied by the length of the calibration lever 4 and converted into the calibration torque. No torque sensor is required, resulting in low equipment cost. The calibration process is stable and has minimal impact due to the use of a hydraulic drive mechanism for loading. It can handle large torque loads and has low investment costs for large-range torque calibration. Furthermore, torque calibration operations in both directions can be performed at a single location, and the overall size is small.

[0030] A deflection detection mechanism 6 is also provided on the outer side of the calibration lever 4. The deflection detection mechanism 6 is attached to the end of the transmission shaft 3 and realizes the detection and display of the rotation of the transmission shaft 3. By setting up the deflection detection mechanism 6, when the transmission shaft 3 rotates during torque calibration, the staff can visually detect it and prevent calibration errors.

[0031] The hydraulic drive mechanism includes a hydraulic telescopic rod 5, with a connector 42 fixed to its top end. The connector 42 is rotatably connected to one end of a calibration lever 4 via a rotating shaft 41. A pressure sensor 53 for measuring the pressure value of the hydraulic telescopic rod 5 is installed on the hydraulic telescopic rod 5. The hydraulic telescopic rod 5 drives the calibration lever 4 to rotate via the connector 42 and the rotating shaft 41.

[0032] Furthermore, a connecting piece 51 is fixed to the bottom end of the hydraulic telescopic rod 5, and a support base 52 is rotatably connected to the connecting piece 51.

[0033] Furthermore, the deflection detection mechanism 6 includes a side frame 61 fixed to the outside of the calibration lever 4. A slide block 63 is slidably mounted on the side frame 61 via a guide rail 62. A detection disk 64 is rotatably connected to the slide block 63. The detection disk 64 is in contact with the outside of the end of the transmission shaft 3. An indicator mark 66 is provided on the detection disk 64. An indicator arrow 67 is fixed on the slide block 63.

[0034] Furthermore, a tension spring 65 is connected between the slide block 63 and the side frame 61, and the elastic force of the tension spring 65 is used to drive the detection disk 64 to move towards the transmission shaft 3.

[0035] Specifically, a guide rail 62 is formed on the side frame 61, and a slide block 63 is slidably disposed in the guide rail 62. The slide block 63 can slide and adjust on the guide rail 62. A tension spring 65 is connected between the slide block 63 and the side frame 61, so that the detection disc 64 connected on the slide block 63 keeps in contact with the outside of the drive shaft 3. When the drive shaft 3 rotates, it synchronously drives the detection disc 64 to rotate. At this time, the position of the indicator arrow 67 and the indicator mark 66 deviates, thus indicating when the drive shaft 3 rotates and preventing calibration errors. The detection disc 64 is installed through the guide rail 62 and the slide block 63. The slide block 63 is driven by the tension spring 65. The detection disc 64 can be adjusted by sliding the slide block 63, so as to realize the deflection detection of drive shafts 3 of different specifications, which is more convenient to use.

[0036] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A hydraulically driven, large-range transmission shaft torque calibration fixture, characterized in that, include: Fixed support (1), on which a connecting seat (2) is vertically fixed; A drive shaft (3) is fixedly connected at one end to a connecting seat (2), and a strain gauge detection module (31) is provided on the drive shaft (3). A hydraulic drive mechanism is provided, with a calibration lever (4) movably connected to its top end. The hydraulic drive mechanism is used to drive the calibration lever (4) to swing. The other end of the transmission shaft (3) is fixedly connected to the calibration lever (4). A deflection detection mechanism (6) is also provided on the outside of the calibration lever (4). The deflection detection mechanism (6) is attached to the end of the transmission shaft (3) and realizes the detection and display of the rotation of the transmission shaft (3).

2. The hydraulically driven large-range transmission shaft torque calibration fixture according to claim 1, characterized in that: The hydraulic drive mechanism includes a hydraulic telescopic rod (5), and a connector (42) is fixed at the top of the hydraulic telescopic rod (5). The connector (42) is rotatably connected to one end of the calibration lever (4) through a rotating shaft (41). A pressure sensor (53) for measuring the pressure value of the hydraulic telescopic rod (5) is provided on the hydraulic telescopic rod (5).

3. The hydraulically driven large-range transmission shaft torque calibration fixture according to claim 2, characterized in that: The bottom end of the hydraulic telescopic rod (5) is fixed with a connecting piece (51), and a support base (52) is rotatably connected to the connecting piece (51).

4. The hydraulically driven large-range transmission shaft torque calibration fixture according to claim 3, characterized in that: The deflection detection mechanism (6) includes a side frame (61) fixed on the outside of the calibration lever (4). A slide block (63) is slidably arranged on the side frame (61) via a guide rail (62). A detection disk (64) is rotatably connected to the slide block (63). The detection disk (64) is in contact with the outside of the end of the transmission shaft (3). An indicator mark (66) is provided on the detection disk (64). An indicator arrow (67) is fixed on the slide block (63).

5. The hydraulically driven large-range transmission shaft torque calibration fixture according to claim 4, characterized in that: A tension spring (65) is connected between the slide (63) and the side frame (61), and the elastic force of the tension spring (65) is used to drive the detection disk (64) to move towards the drive shaft (3).

6. The hydraulically driven large-range transmission shaft torque calibration fixture according to claim 1, characterized in that: The fixed support (1) has fixing screw holes (11) at each of its four corner positions for auxiliary fixing.

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