A double-hydraulic-cylinder torque loading and leveling device

Abstract

The application belongs to the technical field of torque metering 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 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 an output end of the first hydraulic cylinder (8), and a displacement sensor (10) is arranged at an output end of the second hydraulic cylinder (9). An angular displacement 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. The application can quickly and accurately level the double hydraulic cylinders.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of torque calibration and detection, and particularly relates to a double-hydraulic-cylinder torque loading and leveling device. BACKGROUND

[0002] Torque standard devices can be divided into static weight type and reference type in principle.

[0003] The static weight type torque standard device takes a lever and a weight as a standard torque value source, has the advantages of high accuracy and good stability, but the overall weight is affected by the weight, the overall weight of a large range is large, the occupied space is huge, and only discrete loading points that can be provided are selected according to weight combination for testing.

[0004] The reference type torque standard device takes a standard torque sensor as a standard torque value source. The reference type torque standard device has small floor space and light overall weight, and can realize continuous loading, but the uncertainty is limited by the used standard torque sensor, and the system leveling has a big difficulty. SUMMARY

[0005] In order to solve the above problems, the application provides a double-hydraulic-cylinder torque loading and leveling device, which adopts a load sensor and a lever force arm to load and calibrate a standard torque.

[0006] The double-hydraulic-cylinder torque loading and leveling device provided by the application mainly comprises 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 a first end of a lever, the second hydraulic cylinder is connected to a second end of the lever, a load sensor is arranged at an output end of the first hydraulic cylinder, a displacement sensor is arranged at an output end of the second hydraulic cylinder, and an angular displacement sensor is arranged 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 horizontal.

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

[0008] Preferably, the hydraulic pump is further connected with a safety valve.

[0009] Preferably, the first servo valve and the second servo valve are connected with a controller, and the controller is further connected with the displacement sensor, the load sensor and the angular displacement sensor.

[0010] Preferably, the controller is further connected with an upper computer.

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

[0012] The first PID algorithm comprises first calculating a set output force according to a torque N required to be provided by the torque calibration platform and a 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 a load F1 fed back by the load sensor.

[0013] The second PID algorithm comprises first calculating a 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 a displacement x1 fed back by the displacement sensor.

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

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

[0016] Figure 2 is a schematic diagram of the closed-loop control of the double hydraulic cylinders of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in more detail below in combination with the drawings of the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0018] The present application provides a torque loading and leveling device of double hydraulic cylinders, such as Figure 1As shown, mainly includes the first hydraulic cylinder 8 controlled by the first servo valve 6, the second hydraulic cylinder 9 controlled by the second servo valve 7, the first hydraulic cylinder 8 is connected at the first end of the lever, the second hydraulic cylinder 9 is connected at the second end of the lever, the output end of the first hydraulic cylinder 8 is provided with a load sensor 11, the output end of the second hydraulic cylinder 9 is provided with a displacement sensor 10, the lever is provided with a swing angle sensor 13, 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 mode of load sensor and lever force 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 force arm; and according to the lever angle detected by the swing angle sensor 13, and cooperates with the displacement sensor 10 to perform displacement closed-loop control on the second hydraulic cylinder 9, so that the lever always keeps in a horizontal position.

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

[0021] In some optional embodiments, the hydraulic pump 2 is further connected with a safety valve 3.

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

[0023] In some optional embodiments, the controller 5 is further connected with an upper computer 4. In this embodiment, the system operation data can be displayed in real time through the upper computer 4.

[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 a set output force F according to a torque N required to be provided by the torque calibration table and a 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 a load F1 fed back by the load sensor 11;

[0026] The second PID algorithm includes first calculating a displacement x required for the lever to reach a 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 a displacement x1 fed back by the displacement sensor 10.

[0027] AsFigure 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, 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 feedback load F1, outputs the control signal U1 of the first servo valve 6, and makes the output force of the first hydraulic cylinder 8 be N / L.

[0030] The second hydraulic cylinder 9 adopts displacement closed-loop control, according to the lever swing angle θ detected by the swing angle sensor 13, the displacement x needed for the lever to reach the horizontal position is calculated, the displacement calculation formula is x=L*tanθ; the controller 5 adopts the second PID algorithm according to the feedback displacement signal x1 of the displacement sensor 10 and the calculation displacement signal x, outputs the control signal U2 of the second servo valve 7, and closes the loop to control the displacement of the second hydraulic cylinder 9, so that the lever always maintains the horizontal position, and the control process is as shown in Figure 2

[0031] When the lever always maintains the horizontal position under the displacement closed-loop control of the second hydraulic cylinder 9, the force arms of the two hydraulic rods are L1=L2=L, at this time, the output force of the second hydraulic cylinder 9 is equal to that of the first hydraulic cylinder 8, that is, F, which satisfies F*L1=F*L2=N.

[0032] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A dual-hydraulic-cylinder torque loading and leveling device, characterized in that, It 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 provided at the output end of the first hydraulic cylinder (8), and a displacement sensor (10) is provided at the output end of the second hydraulic cylinder (9). A swing angle sensor (13) is provided 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 always horizontal. The first servo valve (6) and the second servo valve (7) are both connected to the controller (5), and the controller (5) is also connected to the displacement sensor (10), the load sensor (11) and the swing angle sensor (13). 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 includes first calculating the set output force based on the torque N required by the torque calibration table 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 includes first calculating the displacement x required for the lever to reach the horizontal position based on the swing angle sensor (13), and then performing closed-loop control of the second hydraulic cylinder (9) based on the displacement x and the displacement x1 fed back by the displacement sensor (10).

2. The dual hydraulic cylinder torque loading and leveling device as described in claim 1, characterized in that, Both the first servo valve (6) and the second servo valve (7) are driven by a motor (1) and a hydraulic pump (2). 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 as described in 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 as described in claim 1, characterized in that, The controller (5) is also connected to a host computer (4).

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