Torque loading and leveling device with double hydraulic cylinders

Abstract

The invention belongs to the technical field of torque measurement calibration detection, and particularly relates to a double-hydraulic-cylinder torque loading and leveling device. The device comprises a first hydraulic cylinder (8) controlled by a first servo valve (6) and a second hydraulic cylinder (9) controlled by a second servo valve (7), the first hydraulic cylinder (8) is connected to the first end of a lever, the second hydraulic cylinder (9) is connected to the second end of the lever, the output end of the first hydraulic cylinder (8) is provided with a load sensor (11), and the output end of the second hydraulic cylinder (9) is provided with a displacement sensor (10). A swing angle sensor (13) is arranged on the lever, the first hydraulic cylinder (8) adopts a load closed-loop control mode to continuously output standard torque, and the second hydraulic cylinder (9) adopts a displacement closed-loop control mode to keep the lever horizontal all the time. The double-hydraulic-cylinder leveling device can quickly and accurately level the double hydraulic cylinders.

Description

Technical Field

[0001] The present application belongs to the technical field of torque measurement, calibration and detection, and in particular relates to a dual hydraulic cylinder torque loading and leveling device. Background Art

[0002] In principle, torque standard devices can be divided into two types: deadweight type and reference type.

[0003] The static weight torque standard device uses levers and weights as the source of standard torque values, and has the advantages of high accuracy and good stability. However, the weight of the entire machine is affected by the weights. The entire machine with a large range is heavy and occupies a huge space. The test can only be carried out by selecting the available discrete loading points according to the weight combination.

[0004] The reference torque standard device uses a standard torque sensor as the source of the standard torque value. The reference torque standard device occupies a small space, is light in weight, and can achieve continuous loading, but its uncertainty is limited by the standard torque sensor used, and there is a problem of difficulty in system leveling. Summary of the invention

[0005] In order to solve the above problems, the present application provides a dual hydraulic cylinder torque loading and leveling device, which uses a load sensor and a lever arm to perform standard torque loading and calibration.

[0006] The dual hydraulic cylinder torque loading and leveling device provided in the present application mainly includes a first hydraulic cylinder controlled by a first servo valve and a second hydraulic cylinder controlled by a second servo valve. The first hydraulic cylinder is connected to the first end of the lever, and the second hydraulic cylinder is connected to the second end of the lever. A load sensor is provided at the output end of the first hydraulic cylinder, a displacement sensor is provided at the output end of the second hydraulic cylinder, and a swing angle sensor is provided on the lever. The first hydraulic cylinder adopts a load closed-loop control mode to continuously output a standard torque, and the second hydraulic cylinder adopts a displacement closed-loop control mode to keep the lever always level.

[0007] Preferably, the first servo valve and the second servo valve are both driven by a motor and a hydraulic pump, and the motor drives the hydraulic pump to operate so as to provide hydraulic energy to the first servo valve and the second servo valve.

[0008] Preferably, the hydraulic pump is also connected to a safety valve.

[0009] Preferably, the first servo valve and the second servo valve are both connected to a controller, and the controller is also connected to a displacement sensor, a load sensor and a swing angle sensor.

[0010] Preferably, the controller is also connected to a host computer.

[0011] Preferably, the controller is configured to control the first hydraulic cylinder according to a first PID algorithm and to control the second hydraulic cylinder according to a second PID algorithm;

[0012] The first PID algorithm includes first calculating a set output force according to the torque N required to be provided by the torque calibration platform and the distance L between the first hydraulic cylinder and the lever support point, and then performing closed-loop control on the first hydraulic cylinder based on the set output force F and the load F1 fed back by the load sensor;

[0013] The second PID algorithm includes first calculating the displacement x required for the lever to reach a horizontal position according to the swing angle sensor, and then performing closed-loop control on the second hydraulic cylinder based on the displacement x and the displacement x1 fed back by the displacement sensor.

[0014] The application can quickly and accurately level the double hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a preferred embodiment of the dual hydraulic cylinder torque loading and leveling device of the present application.

[0016] Figure 2 This is a schematic diagram of the closed-loop control of the dual hydraulic cylinders in this application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0018] The present application provides a dual hydraulic cylinder torque loading and leveling device, such as Figure 1As shown, it mainly includes a first hydraulic cylinder 8 controlled by a first servo valve 6 and a second hydraulic cylinder 9 controlled by a second servo valve 7. The first hydraulic cylinder 8 is connected to the first end of the lever, and the second hydraulic cylinder 9 is connected to the second end of the lever. A load sensor 11 is arranged at the output end of the first hydraulic cylinder 8, and a displacement sensor 10 is arranged at the output end of the second hydraulic cylinder 9. A swing angle sensor 13 is arranged on the lever. The first hydraulic cylinder 8 adopts a load closed-loop control mode to continuously output a standard torque, and the second hydraulic cylinder 9 adopts a displacement closed-loop control mode to keep the lever always horizontal.

[0019] The present application adopts the method of load sensor and lever arm to load and calibrate the standard torque. The first servo valve 6 controls the output force of the first hydraulic cylinder 8 with high precision, and calculates the standard torque value according to the lever arm; and according to the lever angle detected by the swing angle sensor 13, the displacement of the second hydraulic cylinder 9 is controlled in a closed loop in cooperation with the displacement sensor 10, so that the lever always maintains a horizontal position.

[0020] In some optional embodiments, the first servo valve 6 and the second servo valve 7 are both driven by a motor 1 and a hydraulic pump 2 , and the motor 1 drives the hydraulic pump 2 to operate so as to provide hydraulic energy to the first servo valve 6 and the second servo valve 7 .

[0021] In some optional implementations, the hydraulic pump 2 is also connected to a safety valve 3 .

[0022] In some optional implementations, the first servo valve 6 and the second servo valve 7 are both connected to a controller 5 , and the controller 5 is further connected to a displacement sensor 10 , a load sensor 11 and a swing angle sensor 13 .

[0023] In some optional implementations, the controller 5 is further connected to a host computer 4. In this embodiment, the host computer 4 can display system operation data in real time.

[0024] In some optional embodiments, the controller 5 is configured to control the first hydraulic cylinder 8 according to a first PID algorithm and control the second hydraulic cylinder 9 according to a second PID algorithm;

[0025] The first PID algorithm includes first calculating the set output force F according to the torque N required to be provided by the torque calibration platform and the distance L between the first hydraulic cylinder 8 and the lever support point, and then performing closed-loop control on the first hydraulic cylinder 8 based on the set output force F and the load F1 fed back by the load sensor 11;

[0026] The second PID algorithm includes first calculating the displacement x required for the lever to reach the horizontal position according to the swing angle sensor 13 , and then performing closed-loop control on the second hydraulic cylinder 9 based on the displacement x and the displacement x1 fed back by the displacement sensor 10 .

[0027] like Figure 1 As shown, the force arm of the first hydraulic cylinder 8 is L. If the torque calibration platform needs to provide a torque of N, the output force F of the first hydraulic cylinder 8 is:

[0028] F=N / L.

[0029] The first hydraulic cylinder 8 adopts load closed-loop control, and the power source composed of the motor 1 and the hydraulic pump 2 provides hydraulic energy. The load sensor 11 detects the output force F1 of the first hydraulic cylinder 8 and feeds it back to the controller 5. The controller adopts the first PID algorithm according to the set output force F and the fed-back load F1, and outputs the control signal U1 of the first servo valve 6, so that the output force of the first hydraulic cylinder 8 is N / L.

[0030] The second hydraulic cylinder 9 is controlled by a closed-loop displacement control. According to the lever swing angle θ detected by the swing angle sensor 13, the displacement x required for the lever to reach the horizontal position is calculated. The displacement calculation formula is x=L*tanθ. The controller 5 uses the second PID algorithm according to the feedback displacement signal x1 of the displacement sensor 10 and the calculated displacement signal x to output the control signal U2 of the second servo valve 7, and controls the displacement of the second hydraulic cylinder 9 in a closed-loop manner, so that the lever always maintains a horizontal position. The control process is as follows: Figure 2 shown.

[0031] When the lever always maintains a horizontal position under the closed-loop displacement control of the second hydraulic cylinder 9, the force arms of the two hydraulic rods are L1=L2=L. At this time, the output forces of the second hydraulic cylinder 9 and the first hydraulic cylinder 8 are equal to F, satisfying F·L1=F·L2=N.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A dual hydraulic cylinder torque loading and leveling device, characterized in that: The invention comprises a first hydraulic cylinder (8) controlled by a first servo valve (6) and a second hydraulic cylinder (9) controlled by a second servo valve (7). The first hydraulic cylinder (8) is connected to a first end of a lever, and the second hydraulic cylinder (9) is connected to a second end of the lever. A load sensor (11) is arranged at the output end of the first hydraulic cylinder (8), and a displacement sensor (10) is arranged at the output end of the second hydraulic cylinder (9). A swing angle sensor (13) is arranged on the lever. The first hydraulic cylinder (8) adopts a load closed-loop control mode to continuously output a standard torque, and the second hydraulic cylinder (9) adopts a displacement closed-loop control mode to keep the lever always horizontal.

2. The dual hydraulic cylinder torque loading and leveling device according to claim 1, characterized in that: The first servo valve (6) and the second servo valve (7) are both driven by a motor (1) and a hydraulic pump (2), and the motor (1) drives the hydraulic pump (2) to operate so as to provide hydraulic energy to the first servo valve (6) and the second servo valve (7).

3. The dual hydraulic cylinder torque loading and leveling device according to claim 2, characterized in that: The hydraulic pump (2) is also connected to a safety valve (3).

4. The dual hydraulic cylinder torque loading and leveling device according to claim 1, characterized in that: The first servo valve (6) and the second servo valve (7) are both connected to a controller (5), and the controller (5) is also connected to a displacement sensor (10), a load sensor (11) and a swing angle sensor (13).

5. The dual hydraulic cylinder torque loading and leveling device according to claim 4, characterized in that: The controller (5) is also connected to a host computer (4).

6. The dual hydraulic cylinder torque loading and leveling device according to claim 5, characterized in that: The controller (5) is configured to control the first hydraulic cylinder (8) according to a first PID algorithm, and to control the second hydraulic cylinder (9) according to a second PID algorithm; The first PID algorithm comprises first calculating a set output force according to the torque N required to be provided by the torque calibration platform and the distance L between the first hydraulic cylinder (8) and the lever support point, and then performing closed-loop control on the first hydraulic cylinder (8) based on the set output force F and the load F1 fed back by the load sensor (11); The second PID algorithm comprises first calculating the displacement x required for the lever to reach a horizontal position according to a swing angle sensor (13), and then performing closed-loop control on the second hydraulic cylinder (9) based on the displacement x and the displacement x1 fed back by the displacement sensor (10).

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