A six-part adaptive balance control bending load test system

Abstract

The application discloses a kind of six-form self-adapting balanced control's bending loading test system, it is related to the field of automobile test, including body-in-white restraint support device, servo motor loading device and self-adapting balanced control loading device, body-in-white restraint support device is used to set in the body-in-white to be measured below, to support the body-in-white to be measured;Servo motor loading device includes multiple for being set in the body-in-white to be measured both sides, and under the driving of servo motor vertically up and down movement to form loading force connecting rod;Self-adapting balanced control loading device includes multiple through the body-in-white to be measured and with the loading block being set on the bottom plate of body-in-white to be measured connected square beam, the both ends of square beam are connected with the top end of connecting rod, to form loading force between the loading point between loading block and the bottom plate of body-in-white.The application can effectively improve work efficiency, reduce personnel load, improve test precision, ensure the accuracy of test data and the consistency of result.

Description

Technical Field

[0001] This invention relates to the field of automotive testing, and more specifically to a bending load testing system with a six-part adaptive balance control. Background Technology

[0002] The development of automotive design technology is inseparable from the advancement of automotive testing technology. In the development of body-in-white products, stiffness results are related to a series of performance characteristics such as vehicle safety, handling stability, NVH (Noise, Vibration, Harshness) performance, and comfort. Among them, static stiffness includes the bending and torsion of the body-in-white. Due to the influence of actual manufacturing processes, static stiffness testing is necessary to obtain a more accurate static stiffness value of the body-in-white for the development of each model. Therefore, improving the accuracy and confidence level of static stiffness testing is of paramount importance.

[0003] A typical bending test system includes the following components: a constraint device, a loading device, a loading system, and a data processing system. The constraint devices are largely similar, and the actual constraint methods and results are not significantly different. However, the loading methods and devices differ. If multi-point servo motors are used for loading, the loading force may become eccentric due to the vehicle body not being level and the servo motors not being synchronized, leading to increased accuracy and error in the results.

[0004] Currently, most static stiffness testing systems for body-in-white are designed with loading and constraint devices in mind, only considering the constraints and loading devices. This leads to the following problems:

[0005] 1. In the preparation stage of the body-in-white bending test, depending on the weight and size of the body-in-white, hoisting is often used to assist in installation and fixation. Using traditional mechanical methods to center and level the body-in-white and adjust the axis of the measuring device with a plumb bob is technically difficult, labor-intensive, inefficient, and prone to misalignment. If the body-in-white is horizontal, it can easily cause the left and right servo motors to become eccentric in their load distribution to the center. Figure 1 As shown, the accuracy of the test results is not ideal due to the influence of the constraint device structure.

[0006] 2. In the body-in-white bending test, the internal clearance force caused by the constraint device during the body-in-white installation process will result in static error due to the internal clearance force, which will lead to poor consistency of the test and insufficient accuracy of the test results.

[0007] 3. During the loading process of the body-in-white bending test, the loading force is required to be constantly changing, with the force value gradually increasing and the direction remaining unchanged. However, in reality, during the loading process of the servo motor, the loading force is a spatial vector whose magnitude and direction are constantly changing. Due to the eccentricity of the force, the loading force at one end will be greater than that at the other end at the same time. There will also be differences in the force values ​​of the servo motors before and after loading. The loading process generates dynamic errors. The existence of dynamic errors will lead to large differences in the data of the left and right measuring points of the body-in-white in the test results, resulting in inaccurate data. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a bending load testing system with six-part adaptive balance control, which can effectively improve work efficiency, reduce personnel workload, improve test accuracy, and ensure the accuracy and consistency of test data and results.

[0009] To achieve the above objectives, the present invention provides a bending loading test system with six-part adaptive equilibrium control, comprising:

[0010] The body-in-white constraint support device is used to be installed under the body-in-white to support the body-in-white under test;

[0011] A servo motor loading device includes multiple connecting rods that are installed on both sides of the body-in-white to be tested and can move vertically up and down under the drive of a servo motor to generate a loading force.

[0012] An adaptive balance control loading device includes multiple square beams that pass through the body-in-white to be tested and are connected to loading blocks installed on the bottom plate of the body-in-white. The two ends of the square beams are connected to the top of the connecting rods to generate a loading force between the loading blocks and the bottom plate of the body-in-white.

[0013] The servo motor loading device uses a distributed loading control method to control the loading force. Below the connecting rod is a six-point force measuring structure for obtaining the loading force value of each loading point during the loading process, so as to ensure that the loading force value and loading speed of each loading point change synchronously.

[0014] Based on the above technical solution, the body-in-white constraint support device includes:

[0015] The T-shaped bracket is used to support the two front suspension mounting points located on the front side of the bottom of the body-in-white to be tested.

[0016] Two vertical supports are provided to support the rear suspension support fixing point located at the bottom rear side of the body-in-white under test. The vertical supports can be adjusted up and down to adapt to the height of the T-shaped support so that the body-in-white under test is in a horizontal state.

[0017] Based on the above technical solution, the servo motor loading device includes multiple sets of loading components, and each set of loading components includes two loading units respectively set on both sides of the body-in-white to be tested. The loading unit includes a connecting rod that can move vertically up and down to form a loading force. One loading unit in the loading component is set on one side of the body-in-white to be tested, and the other loading unit is set on the other side of the body-in-white to be tested.

[0018] Based on the above technical solution, the servo motor is located at the bottom of the connecting rod, and the loading unit also includes a worm gear for being driven by the servo motor to rise and fall, thereby driving the connecting rod to descend and form a loading force. A six-part force measuring structure is provided between the connecting rod and the worm gear.

[0019] Based on the above technical solution, each square beam corresponds to a set of loading components, and one end of the square beam is connected to the top end of the connecting rod of a loading unit in the corresponding loading component, and the other end is connected to the top end of the connecting rod of another loading unit in the corresponding loading component.

[0020] Based on the above technical solution, the loading components are in two sets, the square beams are two, and the two square beams are parallel to each other and pass through the body-in-white to be tested at intervals. The square beams are perpendicular to the length direction of the body-in-white to be tested, and each square beam has two loading blocks in the middle, which are located between the square beam and the bottom plate of the body-in-white to be tested.

[0021] Based on the above technical solution, the six-point force measuring structure includes three load sensors in the Z-axis direction, one load sensor in the X-axis direction, and two load sensors in the Y-axis direction.

[0022] Based on the above technical solution, the signal measured by the load sensor in the six-point force measuring structure is acquired, amplified, and converted. Then, it is transmitted to the host computer via a wired connection through the output board. The host computer calculates the force value of the six-point force measuring structure, thereby obtaining the loading force value of the loading point.

[0023] Based on the above technical solution, when applying force to the loading point:

[0024] The servo motor loading device is connected to the computer control unit via a control signal line. The computer control unit controls the movement of the connecting rod to apply a loading force to the loading point. The force value measured by the six-point force measuring structure is used as a closed-loop feedback signal to the computer control unit to form PID control. The distributed loading control method is adopted to control the loading force value and loading speed of each loading point to change synchronously.

[0025] Based on the above technical solutions, in distributed loading:

[0026] The gradient value of the dynamic loading force is set, and a point-weighted equilibrium method is adopted. When loading the next gradient loading force value, the ideal incremental force value change of all loading points is weighted to determine the increment value of the next gradient loading force value of the current loading point.

[0027] Compared with the prior art, the advantages of the present invention are: the use of dynamic distributed loading to eliminate static errors and internal gap forces during test preparation; the use of PID regulation during bending loading and point-weighted balancing to reduce test errors caused by imbalance and asynchrony of loading forces; and the simple control logic of the loading method, which can effectively improve work efficiency, reduce personnel load, improve test accuracy, and ensure the accuracy of test data and the consistency of results. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram illustrating the loading of an eccentric load;

[0030] Figure 2 This is a schematic diagram of the bending loading test system with six-part adaptive balance control in this invention;

[0031] Figure 3 This is a schematic diagram of the loading unit structure;

[0032] Figure 4 This is a schematic diagram of a six-part force-measuring structure;

[0033] Figure 5 This is a schematic diagram of the force measurement analysis for a six-part force measurement structure;

[0034] Figure 6 This is a schematic diagram illustrating the application of the loading force.

[0035] Figure 7 This is a flowchart for a bending load test.

[0036] In the diagram: 1-Body white to be tested, 2-Connecting rod, 3-Loading block, 4-Square beam, 5-T-type support, 6-Vertical support, 7-, 8-Loading unit, 9-Six-part force measuring structure, 10-Worm gear, 11-Load sensor. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] This invention provides a six-part adaptive balance control bending load testing system. Addressing the issues of eliminating internal clearances during body-in-white loading and dynamic errors during the loading process, it employs a more effective loading control method, thereby more accurately and efficiently solving loading problems and improving test precision, increasing the confidence and consistency of test results.

[0039] See Figure 2 As shown in the figure, an embodiment of the present invention provides a bending load testing system with six-part adaptive balance control, including a body-in-white constraint support device, a servo motor loading device, and an adaptive balance control loading device.

[0040] In this invention, a body-in-white constraint support device is installed below the body-in-white 1 to support it. Specifically, the body-in-white constraint support device includes a T-shaped support 5 and two vertical supports 6. The T-shaped support 5 supports the two front suspension mounting points located on the front side of the bottom of the body-in-white 1; the vertical supports 6 support the rear suspension support mounting points located on the rear side of the bottom of the body-in-white 1, and the vertical supports 6 are adjustable up and down to accommodate the height of the T-shaped support 5, so that the body-in-white 1 is in a horizontal state.

[0041] Specifically, the front of the body-in-white 1 under test is supported by a T-shaped bracket 5, which is connected to the front suspension mounting point; the rear of the body-in-white 1 under test is supported by a vertical bracket 6, which is connected to the rear suspension support mounting point. The vertical bracket 6 is adjustable up and down to accommodate the height of the front of the body-in-white 1 under test, thus ensuring that the body-in-white 1 under test is kept in a horizontal position and effectively guaranteeing the accuracy of the bending load test.

[0042] In this invention, the servo motor loading device includes multiple connecting rods 2 that are disposed on both sides of the body-in-white 1 to be tested and can move vertically up and down under the drive of the servo motor to generate a loading force. Specifically, the servo motor loading device includes multiple sets of loading components, and each set of loading components includes two loading units 8 respectively disposed on both sides of the body-in-white 1 to be tested. Each loading unit 8 includes a connecting rod 2 that can move vertically up and down to generate a loading force. One loading unit 8 of the loading component is disposed on one side of the body-in-white 1 to be tested, and the other loading unit 8 is disposed on the other side of the body-in-white 1 to be tested. Figure 3 As shown, the servo motor is located at the bottom of the connecting rod 2. The loading unit 8 also includes a worm gear 10 for being driven by the servo motor to rise and fall, thereby driving the connecting rod 2 to fall and form a loading force. A six-part force measuring structure 9 is provided between the connecting rod 2 and the worm gear 10, that is, a six-part force measuring structure 9 is provided between the connecting rod 2 and the worm gear 10 of each loading unit 8.

[0043] In this invention, the adaptive balance control loading device includes multiple square beams 4 that pass through the body-in-white 1 to be tested and are connected to loading blocks 3 set on the bottom plate of the body-in-white 1. The two ends of the square beams 4 are connected to the top of the connecting rod 2 to form a loading force between the loading points of the loading blocks 3 and the bottom plate of the body-in-white. The servo motor loading device uses a distributed loading control method to control the loading force. A six-point force measuring structure 9 is provided below the connecting rod 2 to obtain the loading force value of each loading point during the loading process, so as to ensure that the loading force value and loading speed of each loading point change synchronously, so as to achieve the purpose of not causing eccentricity.

[0044] Each square beam 4 corresponds to a set of loading components, and one end of the square beam 4 is connected to the top end of the connecting rod 2 of a loading unit 8 in the corresponding loading component, and the other end is connected to the top end of the connecting rod 2 of another loading unit 8 in the corresponding loading component.

[0045] It is understandable that the loading unit 8 is equipped with a servo motor. When performing a bending load test, the servo motor drives the rolling screw pair of the worm gear 10 to rise and fall. The falling of the rolling screw pair is linked to the falling of the rigid connecting rod 2. The loading end is the square beam 4 located at the top of the connecting rod 2 and the loading block 3 installed on the body-in-white 1 to be tested. The falling of the connecting rod 2 can generate a loading force between the loading block 3 and the loading point between the loading block 3 and the body-in-white floor, thus completing the bending load test.

[0046] In one possible implementation, the loading assembly consists of two sets of square beams 4, which are parallel to each other and pass through the body-in-white 1 under test at intervals. The square beams 4 are perpendicular to the length direction of the body-in-white 1, and each square beam 4 has two loading blocks 3 located in its middle, between the square beam 4 and the bottom plate of the body-in-white 1. The descent of the connecting rod 2 of the loading unit 8 in one set of loading assemblies causes one square beam 4 to descend, creating a loading force at the loading point between the loading block 3 and the bottom plate of the body-in-white, thus achieving bending recording.

[0047] In this invention, see Figure 4 As shown, the six-axis force measurement structure 9 includes three load sensors 11 along the Z-axis, one load sensor 11 along the X-axis, and two load sensors 11 along the Y-axis. The signals measured by the load sensors 11 in the six-axis force measurement structure 9 are acquired, amplified, and converted. Then, they are transmitted to the host computer via a wired connection through the output board. The host computer calculates the force value of the six-axis force measurement structure 9, thereby obtaining the loading force value at the loading point. The six-axis force measurement structure 9 is a multi-channel data acquisition system, containing six load sensors 11 and corresponding independent measurement channels.

[0048] See Figure 5 As shown, based on the arrangement of the load sensor 11, we can obtain:

[0049]

[0050]

[0051] An eccentric force is generated, resulting in:

[0052]

[0053] In this system, the vehicle's direction of travel is the X-axis, left and right are the Y-axis, and up and down are the Z-axis. F represents the force value measured by the six-part force-measuring structure 9, and M represents the torque measured by the six-part force-measuring structure 9. X F Y F Z M represents the force values ​​in the X, Y, and Z directions measured by the six-point force measuring structure 9. X M Y M Z F1, F2, F3, F4, F5, and F6 represent the torques in the X, Y, and Z directions measured by the six-point force measuring structure 9, respectively. F1, F2, F3, F4, F5, and F6 represent the force values ​​measured by the 1st, 2nd, 3rd, 4th, 5th, and 6th load sensors 11 in the six-point force measuring structure 9, respectively. See Figure 5 As shown, L1, L2, L3, H1, and H2 represent the distances between the load sensor 11 and the X, Y, and Z axes in the coordinate system.

[0054] In this invention, when applying force to the loading point: the servo motor loading device is connected to the computer control unit via a control signal line. The computer control unit controls the movement of the connecting rod 2 to apply force to the loading point. The force value measured by the six-point force measuring structure 9 is used as a closed-loop feedback signal to the computer control unit, forming PID (proportional, integral, and derivative) control. A distributed loading control method is adopted to control the synchronous change of the loading force value and loading speed at each loading point. In distributed loading:

[0055] The gradient value of the dynamic loading force is set, and a point-weighted equilibrium method is adopted. When loading the next gradient loading force value, the ideal incremental force value change of all loading points is weighted to determine the increment value of the next gradient loading force value of the current loading point.

[0056] The system centers on a computer control unit. A servo motor loading device is connected to the computer control unit via control signal lines. The servo motor applies the loading force, and the force measured by the six-point force measuring structure 9 is fed back to the computer control unit in a closed loop, forming PID control. Simultaneously, a distributed loading control method is used to synchronize the changes in loading force and loading speed at each loading point. Figure 6 As shown, this better ensures the smoothness of force application at the bending loading point and keeps the body-in-white as level as possible during loading.

[0057] During distributed loading, the gradient values ​​of dynamic loading are set to correspond to the corresponding sequence as f. k =1, 2, 3...n, using point-weighted equilibrium, for f k Entering the next gradient f k+1 The loading speed is controlled, that is, based on the force values ​​at other loading points, the loading speed is adjusted accordingly. Figure 2 The ideal incremental force value change at the loading point is weighted to determine the increment value for the next stage of the loading point. When there are two groups of loading components, taking the servo motor of a certain loading unit 8 as an example, the increment value is determined by f. k Entering the next gradient f k+1 The force components of the other three loading units 8 relative to this loading unit 8 affect the gradient change of the loading force value of this loading unit 8. The influencing factor is through the relationship between the component force and the gradient f. k The ratio of the applied force is determined, with positive values ​​for the same direction and negative values ​​for the opposite direction. Based on the point weighting, the applied gradient force of the servo motor of the loading unit 8 is balanced according to the weighting. The next applied force gradient f k+1 The required loading force value and f k F below Z Equalization is achieved to ensure the synchronous loading of the servo motors in the four loading units (8), guaranteeing that the overall loading value reaches the next gradient value and achieving smooth loading and vehicle stability during the loading process.

[0058] The following combination Figure 7 The bending load test process of the six-part adaptive balance control of the present invention will be described in detail.

[0059] S1: Hoist the body-in-white 1 to be tested, then move to S2;

[0060] S2: Connect the body-in-white 1 to the body-in-white constraint support device, then proceed to S3;

[0061] S3: Install the adaptive balance control loading device, then proceed to S4;

[0062] S4: Based on Figure 6 As shown, apply the gradient force and proceed to S5;

[0063] S5: Bending load begins, proceed to S6;

[0064] S6: Based on PID control, control the loading unit 8 to apply the loading force. E1, E2, E3 and E4 represent loading unit 8. Proceed to S7.

[0065] S7: Start recording, then proceed to S8;

[0066] S8: Obtain the force and torque values ​​measured by the six-point force measurement structure 9, thereby obtaining the force and torque values ​​at each loading point, and then proceed to S9;

[0067] S9: Determine whether the applied force has reached the required loading force. If yes, the bending loading ends; otherwise, proceed to S10.

[0068] S10: Determine whether the loading forces at each loading point are balanced. If yes, proceed to S6; otherwise, proceed to S11.

[0069] S11: Continue to synchronously load the loading force at each loading point, then proceed to S4.

[0070] The six-part adaptive balance control bending loading test system of this invention provides an economical, practical, and more efficient load application method and control approach to eliminate test errors caused by installation gaps and loading eccentricity, resulting in more accurate test results. To improve the accuracy and consistency of the test system, the system has the following characteristics:

[0071] (1) Research methods to reduce measurement error. Dynamic step-by-step gradient loading is adopted to eliminate static error. The test system is mainly loaded by loading servo motor. Relying on the PID adjustment of the test system, the point-weighted balance method is applied to reduce the test error caused by the unbalanced and asynchronous loading force.

[0072] (2) This system can eliminate the slight difference between the centering of the test bench and the adjustment of the body-in-white posture to be level with the ground during the hoisting process of the body-in-white, and avoid the result deviation and abnormality caused by the installation and fixing.

[0073] (3) The control loading method of this system has a simple control logic, which can effectively improve work efficiency, reduce personnel load, improve test accuracy, and ensure the accuracy of test data and the consistency of results.

[0074] The six-part adaptive balance control bending loading test system of this invention adopts a dynamic distributed loading method to eliminate static errors and internal gap forces during the test preparation process. During the bending loading process, it relies on PID regulation and applies point-position weighted balancing to reduce test errors caused by the imbalance and asynchrony of loading forces. The loading method control logic is simple, which can effectively improve work efficiency, reduce personnel load, improve test accuracy, and ensure the accuracy of test data and the consistency of results.

[0075] In one possible implementation, the present invention also provides a non-transitory computer-readable storage medium located in a PLC (Programmable Logic Controller) controller. The computer program stored on the storage medium is executed by a processor to control the loading force of each loading unit (8) and the distributed loading method.

[0076] Storage media may be any combination of one or more computer-readable media. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0077] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wireline, optical fiber, RF, etc., or any suitable combination thereof.

[0078] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0079] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0080] It should be noted that in this application, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A bending loading test system with six-part adaptive equilibrium control, characterized in that, include: The body-in-white constraint support device is used to be installed under the body-in-white (1) to support the body-in-white (1) to be tested; The servo motor loading device includes multiple connecting rods (2) that are set on both sides of the white body to be tested (1) and move vertically up and down under the drive of the servo motor to form a loading force. An adaptive balance control loading device includes multiple square beams (4) that pass through the body-in-white (1) to be tested and are connected to loading blocks (3) set on the bottom plate of the body-in-white (1). The two ends of the square beams (4) are connected to the top of the connecting rod (2) to form a loading force on the loading point between the loading block (3) and the bottom plate of the body-in-white. The servo motor loading device uses a distributed loading control method to control the loading force. The connecting rod (2) is provided with a six-point force measuring structure (9) below it to obtain the loading force value of each loading point during the loading process, so as to ensure that the loading force value and loading speed of each loading point change synchronously. The servo motor loading device includes multiple loading components, and each loading component includes two loading units (8) respectively set on both sides of the body-in-white (1) to be tested. The loading unit (8) includes a connecting rod (2) that can move vertically up and down to form a loading force. The square beam (4) is perpendicular to the length direction of the body-in-white (1) to be tested, and each square beam (4) has two loading blocks (3) in the middle. Specifically, when applying force to the loading point: The servo motor loading device is connected to the computer control unit through the control signal line. The computer control unit controls the movement of the connecting rod (2) to apply loading force to the loading point. The force value of the six-point force measuring structure (9) is used as a signal to provide closed-loop feedback to the computer control unit, forming PID control. The distributed loading control method is adopted to control the loading force value and loading speed of each loading point to change synchronously. In distributed loading: The gradient value of the dynamic loading force is set, and a point-weighted equilibrium method is adopted. When loading the next gradient loading force value, the ideal incremental force value change of all loading points is weighted to determine the increment value of the next gradient loading force value of the current loading point.

2. The bending loading test system with six-part adaptive balance control as described in claim 1, characterized in that, The body-in-white constraint support device includes: T-shaped bracket (5), the T-shaped bracket (5) is used to support the two front suspension mounting points set on the bottom front side of the body-in-white (1) to be tested: Two vertical supports (6) are used to support the rear suspension support fixing point set at the bottom rear side of the body-in-white (1) to be tested. The vertical supports (6) can be adjusted up and down to adapt to the height of the T-shaped support (5) so that the body-in-white (1) to be tested is in a horizontal state.

3. The bending loading test system with six-part adaptive balance control as described in claim 1, characterized in that: One of the loading units (8) in the loading assembly is located on one side of the body-in-white (1) to be tested, and the other loading unit (8) is located on the other side of the body-in-white (1) to be tested.

4. The bending loading test system with six-part adaptive balance control as described in claim 3, characterized in that: The servo motor is located at the bottom of the connecting rod (2). The loading unit (8) also includes a worm gear (10) for being driven by the servo motor to rise and fall, thereby driving the connecting rod (2) to fall and form a loading force. A six-part force measuring structure (9) is provided between the connecting rod (2) and the worm gear (10).

5. The bending loading test system with six-part adaptive balance control as described in claim 4, characterized in that: Each square beam (4) corresponds to a set of loading components, and one end of the square beam (4) is connected to the top end of the connecting rod (2) of a loading unit (8) in the corresponding loading component, and the other end is connected to the top end of the connecting rod (2) of another loading unit (8) in the corresponding loading component.

6. The bending loading test system with six-part adaptive balance control as described in claim 5, characterized in that: The loading components consist of two sets, the square beams (4) are two pieces, and the two square beams (4) are parallel to each other and pass through the body-in-white (1) to be tested at intervals. The loading block (3) is located between the square beams (4) and the bottom plate of the body-in-white (1) to be tested.

7. The bending loading test system with six-part adaptive balance control as described in claim 1, characterized in that: The six-part force measurement structure (9) includes three load sensors (11) in the Z-axis direction, one load sensor (11) in the X-axis direction, and two load sensors (11) in the Y-axis direction.

8. The bending loading test system with six-part adaptive balance control as described in claim 7, characterized in that: The signal measured by the load sensor (11) in the six-point force measuring structure (9) is collected, amplified, and converted. Then, it is transmitted to the host computer via wired means through the output board. The host computer calculates the force value of the six-point force measuring structure (9) and thus obtains the loading force value of the loading point.

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