Torque calibration device based on closed-loop feedback

Abstract

The invention discloses a torque calibration device based on closed-loop feedback, and belongs to the field of precision measurement, and the torque calibration device comprises a base, a side plate is fixedly installed on one side of the base, a supporting frame is installed at the top of the base, a connecting rod is rotatably connected to the interior of the supporting frame, spline shafts are coaxially and fixedly installed at the two ends of the connecting rod, and the spline shafts are connected with the side plate. A plurality of spline teeth are axially distributed at the end part of the spline shaft; a supporting block is fixedly installed at the top end of the connecting rod, the top end of the supporting block is rotationally connected with a rod end knuckle bearing assembly, the other end of the rod end knuckle bearing assembly is rotationally connected with an installation base, and the installation base is fixed to the supporting frame. By adopting the bearing and the pressure sensor, the test torque is compared with the motor torque, the torque is controlled, and the influence of manual operation on the product quality is avoided.

Description

Technical Field

[0001] This invention relates to the field of precision measurement, and more specifically, to a torque calibration device based on closed-loop feedback. Background Technology

[0002] In the field of torque calibration, existing technologies often rely on manual operation of mechanical loading devices, such as manually tightening bolts. This is easily affected by the operator's skill level and the consistency of force applied, resulting in low calibration accuracy and poor repeatability. Furthermore, the lack of a closed-loop feedback mechanism prevents real-time monitoring and adjustment, leading to insufficient calibration reliability. For example, in automobile manufacturing, traditional calibration devices require repeated manual calibration of the torque of automotive parts, which is inefficient and prone to error accumulation due to operational mistakes and mechanical drift, affecting product quality. Therefore, this invention proposes a torque calibration device based on closed-loop feedback. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a torque calibration device based on closed-loop feedback. By employing a bearing and pressure sensor, the test torque is compared with the motor torque to control the torque magnitude and avoid the impact of manual operation on product quality.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] A torque calibration device based on closed-loop feedback includes a base, a side plate fixedly installed on one side of the base, a support frame installed on the top of the base, a connecting rod rotatably connected inside the support frame, and a spline shaft coaxially fixedly installed at both ends of the connecting rod, with multiple spline teeth axially arranged at the ends of the spline shaft.

[0006] A support block is fixedly installed at the top of the connecting rod, and a rod end joint bearing assembly is rotatably connected to the top of the support block. The other end of the rod end joint bearing assembly is rotatably connected to a mounting seat, and the mounting seat is fixed on the support frame.

[0007] A pressure sensor is installed at the center of the rod end joint bearing assembly;

[0008] When the splined shaft drives the connecting rod to rotate, it will cause the support block to rotate, which will cause the pressure sensor to be squeezed and output an electrical signal.

[0009] Furthermore, at least four sets of robotic arm grippers are installed on the side plate, and the four sets of robotic arm grippers clamp and fix the four corners of the support frame respectively.

[0010] Furthermore, both ends of the connecting rod are rotatably connected to the support frame via bearings, and flanges are fixedly installed on the side wall of the support frame, with the flanges and bearings arranged coaxially.

[0011] Furthermore, at least one set of motors is installed at the end of the spline shaft. The spline shaft is connected to the output end of the motors through the spline teeth. Starting the motors drives the spline shaft to rotate.

[0012] Furthermore, the cross-section of the support block is rectangular, and a rectangular groove adapted to the support block is provided on the side wall of the connecting rod for installing and fixing the support block.

[0013] Furthermore, the rod end joint bearing assembly includes two rod end joint bearings rotatably connected to the connecting rod and the mounting base, respectively, and the pressure sensor is installed between the two rod end joint bearings.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. High-precision torque transmission: The motor is connected to the spline shaft through spline teeth to ensure stable torque transmission, avoid slippage or loosening, and improve torque transmission accuracy.

[0016] 2. Enhanced structural stability: The rectangular support block and the rectangular groove on the connecting rod cooperate to increase the contact area, prevent the support block from shifting radially, and enhance the stability of the mechanical structure.

[0017] 3. Precise force measurement and feedback: The rod end spherical bearing assembly allows for a certain degree of floating between the support block and the mounting base. In conjunction with a pressure sensor, the mechanical force is converted into an electrical signal, enabling precise force measurement. The floating structure also eliminates the effects of installation errors or thermal expansion, improving the system's accuracy and applicability.

[0018] 4. Good structural stability and anti-interference ability: The mechanical arm gripper fixed support frame on the side plate and the flange limit the bearing, which work together to ensure the stability of the device during operation, resist external interference or vibration, and lay the foundation for high-precision calibration.

[0019] 5. Dynamic adjustment and feedback mechanism: The closed-loop feedback mechanism, combined with the motor's dynamic adjustment function, monitors and corrects the deviation between the actual torque and the set value in real time, ensuring high repeatability and accuracy of the calibration process. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a three-dimensional schematic diagram of the support frame structure of the present invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of the connecting rod structure of the present invention.

[0023] Explanation of the labels in the diagram:

[0024] 1. Base; 2. Side plate; 3. Support frame; 4. Connecting rod; 5. Splined shaft; 6. Splined teeth; 7. Support block; 8. Rod end spherical bearing assembly; 9. Mounting seat; 10. Pressure sensor; 11. Flange; 12. Robotic arm gripper. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 3 A torque calibration device based on closed-loop feedback includes a base 1, a side plate 2 fixedly installed on one side of the base 1, a support frame 3 installed on the top of the base 1, a connecting rod 4 rotatably connected inside the support frame 3, and a spline shaft 5 coaxially fixedly installed at both ends of the connecting rod 4, with multiple spline teeth 6 axially arranged at the end of the spline shaft 5.

[0027] A support block 7 is fixedly installed at the top of the connecting rod 4. A rod end joint bearing assembly 8 is rotatably connected to the top of the support block 7. A mounting seat 9 is rotatably connected to the other end of the rod end joint bearing assembly 8, and the mounting seat 9 is fixed on the support frame 3.

[0028] A pressure sensor 10 is installed at the center of the rod end joint bearing assembly 8;

[0029] When the spline shaft 5 drives the connecting rod 4 to rotate, it will drive the support block 7 to rotate, thereby causing the pressure sensor 10 to be squeezed and output an electrical signal.

[0030] Regarding the technical solution of this embodiment, at least four sets of robotic arm grippers 12 are installed on the side plate 2. The four sets of robotic arm grippers 12 clamp and fix the four corners of the support frame 3 respectively. Compared with traditional bolt fixing, the robotic arm grippers 12 can quickly adjust the position or posture of the support frame 3, improve the operational flexibility, and are compatible with industrial robots and other automated equipment to achieve a higher degree of automated operation and improve production efficiency.

[0031] In this embodiment, both ends of the connecting rod 4 are rotatably connected to the support frame 3 via bearings, and a flange 11 is fixedly installed on the side wall of the support frame 3. The flange 11 is coaxially arranged with the bearing and is used to limit the bearing. The coaxial arrangement of the flange 11 and the bearing ensures the alignment of the connecting rod 4 and the support frame 3 and reduces vibration or eccentricity problems.

[0032] In the technical solution of this embodiment, at least one set of motors is installed at the end of the spline shaft 5. The spline shaft 5 is connected to the output end of the motor through the set spline teeth 6. The motor is started to drive the spline shaft 5 to rotate. The motor provides precise and uniform power, which, together with the precise torque transmission of the spline teeth 6, ensures that the system outputs high-precision torque and reduces error accumulation.

[0033] Regarding the technical solution of this embodiment, the cross-section of the support block 7 is set to rectangular, and a rectangular groove adapted to the support block 7 is provided on the side wall of the connecting rod 4 for installing and fixing the support block 7. The rectangular cross-section can provide a larger moment of inertia, enhance bending and torsional resistance, and improve mechanical strength and stability. Secondly, the rectangular groove is closely matched with the support block 7, which can reduce stress concentration and local deformation, and enhance structural durability.

[0034] Regarding the technical solution of this embodiment, the rod end joint bearing assembly 8 includes two rod end joint bearings that are rotatably connected to the connecting rod and the mounting base, respectively, and the pressure sensor 10 is installed between the two rod end joint bearings.

[0035] It should be noted that the spline shafts 5 at both ends are connected by bearings and connecting rods 4. The motors at both ends output simultaneously and can also be used for calibration testing to determine whether the left and right ends are coaxial.

[0036] The principle and process of using this invention:

[0037] When torque calibration is required, the servo motor is started to drive the spline shaft 5 to rotate. The spline shaft 5 drives the connecting rod 4 to rotate through the spline teeth 6. When the connecting rod 4 rotates, the support block 7 fixed at its top rotates accordingly. Through the floating action of the rod end joint bearing, the force is transmitted to the pressure sensor 10, causing it to be squeezed and generate an electrical signal. The signal is compared with the data of the shaft pressure sensor 10. If they match, it means that the output torque is not a problem. When the motor output torque matches the sensor detection value, the torque calibration is completed. The whole process relies on a closed-loop feedback mechanism to ensure high accuracy and high efficiency of calibration.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another element, it may be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A torque calibration device based on closed-loop feedback, characterized in that, Includes a base (1), a side plate (2) is fixedly installed on one side of the base (1), a support frame (3) is installed on the top of the base (1), a connecting rod (4) is rotatably connected inside the support frame (3), and a spline shaft (5) is coaxially fixedly installed at both ends of the connecting rod (4), and multiple spline teeth (6) are axially arranged at the end of the spline shaft (5). A support block (7) is fixedly installed at the top of the connecting rod (4), and a rod end joint bearing assembly (8) is rotatably connected to the top of the support block (7). A mounting seat (9) is rotatably connected to the other end of the rod end joint bearing assembly (8), and the mounting seat (9) is fixed on the support frame (3). A pressure sensor (10) is installed at the center of the rod end joint bearing assembly (8); When the spline shaft (5) drives the connecting rod (4) to rotate, it will drive the support block (7) to rotate, thereby causing the pressure sensor (10) to be squeezed and output an electrical signal.

2. The torque calibration device based on closed-loop feedback according to claim 1, characterized in that: At least four sets of robotic arm grippers (12) are installed on the side plate (2), and the four sets of robotic arm grippers (12) clamp and fix the four corners of the support frame (3) respectively.

3. The torque calibration device based on closed-loop feedback according to claim 2, characterized in that: Both ends of the connecting rod (4) are rotatably connected to the support frame (3) through bearings, and a flange (11) is fixedly installed on the side wall of the support frame (3), with the flange (11) and the bearing arranged coaxially.

4. The torque calibration device based on closed-loop feedback according to claim 2, characterized in that: At least one set of motors is installed at the end of the spline shaft (5). The spline shaft (5) is connected to the output end of the motor through the set spline teeth (6). The motor is started to drive the spline shaft (5) to rotate.

5. The torque calibration device based on closed-loop feedback according to claim 4, characterized in that: The cross-section of the support block (7) is rectangular, and a rectangular groove adapted to the support block (7) is provided on the side wall of the connecting rod (4) for installing and fixing the support block (7).

6. The torque calibration device based on closed-loop feedback according to claim 5, characterized in that: The rod end bearing assembly (8) includes two rod end bearings that are rotatably connected to the connecting rod (4) and the mounting base (9), respectively, and a pressure sensor (10) is installed between the two rod end bearings.

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