A flow-drill screw torque testing device for electric vehicles

Abstract

The application discloses a kind of flow drill screw torque testing devices for electric vehicle, the device includes base, fixed mechanism and screw rotation mechanism, fixed mechanism is located on base, can be automatically clamped and fixed to the plate material to be measured, and be equipped with adjustable vertical clamping arm to adapt complex three-dimensional parts clamping, screw rotation mechanism can clamp flow drill screw and realize positive and negative rotation tightening and loosening action, built-in torque sensor real-time acquisition torque data, fixed mechanism uses multiple cylinder drive, can drive the plate material to be measured automatic displacement, cooperate screw rotation mechanism to realize the cyclic torque test of multiple tightening, loosening, again tightening, device is equipped with tension test component simultaneously, can detect torque load and axial tension load simultaneously, real simulation combined stress state under actual working condition.The application is high in degree of automation, clamping is stable, test data is comprehensive, effectively improves flow drill screw detection efficiency and result accuracy, suitable for the batch performance test of plane plate and three-dimensional structural parts.

Description

Technical Field

[0001] This application relates to the field of electric vehicle component performance testing technology, and more specifically, to a flow drill screw torque testing device for electric vehicles. Background Technology

[0002] Flow drill screw connection technology, with its advantages of high connection strength, no need for pre-drilling, and adaptability to multi-layer sheet metal connections, has been widely used in the assembly of lightweight structures such as electric vehicle bodies, battery packs, and chassis. The tightening torque, cyclic locking stability, and combined load bearing capacity of flow drill screws directly determine the assembly reliability and driving safety of the entire electric vehicle.

[0003] Existing flow drill screw torque testing devices generally suffer from the following defects: 1. The clamping mechanism is mostly a manually adjustable clamping plate, which can only clamp a single plane plate at a time. It cannot meet the fixing requirements of complex three-dimensional structural parts of electric vehicles. The clamping efficiency is low and cannot meet the requirements of batch continuous testing. 2. It can only detect the tightening torque of a single tightening operation, making it difficult to assess the locking stability of the screw under repeated disassembly and alternating loads. The test data is limited and cannot fully reflect the actual performance of the screw. 3. Most of them can only test the tightening torque alone, and cannot simultaneously apply and test the axial tensile load. They cannot simulate the combined stress state of torque and tension on the flow drill screw in actual working conditions. The test results deviate greatly from the actual working conditions, and the test data cannot be mutually verified. 4. Low level of automation, the testing process relies on manual operation, the data collection accuracy is insufficient, and it is difficult to adapt to the standardized and batch testing needs of the electric vehicle industry.

[0004] To address the shortcomings of the existing technologies, this invention proposes a highly automated, multi-cycle torque testing device that can simultaneously detect torque-tension combined loads and is adaptable to both flat plates and complex three-dimensional parts. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a flow drill screw torque testing device for electric vehicles, which realizes automated clamping of multiple cylinders, automatic displacement of the test part, and multi-cycle tightening test of flow drill screws, while simultaneously detecting torque load and axial tensile load, realistically simulating actual assembly conditions, taking into account the fixing test requirements of planar plates and complex three-dimensional parts, and greatly improving test efficiency and data accuracy.

[0006] The objective of this application is achieved through the following technical solution: A torque testing device for a flow drill screw used in electric vehicles includes a base, a fixing mechanism, and a screw rotating mechanism. The fixing mechanism is mounted on the base and is used to fix the plate to be tested. The fixing mechanism is equipped with a vertical clamping arm for fixing the three-dimensional object. The screw rotating mechanism is used to clamp the flow drill screw and realize forward and reverse tightening and loosening actions. The screw rotating mechanism has a built-in torque sensor that can detect and collect the torque value during the tightening process in real time. The fixing mechanism adopts multi-cylinder automatic clamping, which can drive the plate to be tested to automatically move. With the cyclic forward and reverse rotation of the screw rotating mechanism, the device realizes cyclic torque testing of the flow drill screw through multiple tightening, loosening, and re-tightening, and simultaneously detects torque load and tensile load.

[0007] Preferably, the fixing mechanism includes a first clamping plate, a second clamping plate, a third clamping plate, a clamping block, and a cylinder assembly. The first clamping plate has a groove, the clamping block is placed in the groove, the clamping block has a first opening, and a first fastening bolt is installed on the clamping block. The width of the groove is greater than the width of the clamping block. The first clamping plate and the second clamping plate are fixedly connected by a second fastening bolt. The first clamping plate has several guide holes arranged perpendicular to the groove, the guide holes penetrating the first clamping plate and extending into the groove. The second clamping plate has a first cylinder, the output shaft of the first cylinder is fixed with several telescopic rods, the telescopic rods cooperate with the guide holes, and the ends of the telescopic rods are connected to the clamping block. In conjunction with this, the third clamping plate is provided with a first slide rail opened along the groove direction, the second clamping plate is slidably engaged with the third clamping plate, the third clamping plate is provided with a second cylinder, the output shaft of the second cylinder is fixedly connected to one side of the second clamping plate, one side of the third clamping plate is provided with a fixing plate, the fixing plate is provided with a third opening, the first fastening bolt passes through the third opening and is fixedly connected to the first nut, the base is provided with a second slide rail, the third clamping plate is slidably engaged with the base, the base is provided with a third cylinder, the output shaft of the third cylinder is fixedly connected to the third clamping plate, one side of the first clamping plate is provided with a fourth cylinder, the output shaft of the fourth cylinder is provided with a push rod, the push rod is engaged with the plate to be tested.

[0008] Preferably, the screw rotating mechanism is located above the fixing mechanism and includes a rotating motor, a torque sensor, and a screw clamping assembly. The output end of the rotating motor is connected to the torque sensor, and the output end of the torque sensor is connected to the screw clamping assembly. The screw clamping assembly is used to clamp the flow drill screw.

[0009] Preferably, the first clamping plate is provided with a vertical clamping arm, the bottom of which is rotatably engaged with the first clamping plate. The vertical clamping arm includes a telescopic connecting rod and a horizontal clamping arm. The telescopic connecting rod uses a sleeve with internal and external threads to engage with a fastening nut, which can adjust the clamping height.

[0010] Preferably, the clamping block has a first opening, a first fastening bolt is installed on the clamping block, and a second opening perpendicular to the length direction of the groove is opened on the groove. The first fastening bolt passes through the first opening, the second opening, and the third opening in sequence and is connected to the first nut.

[0011] Preferably, the second clamping plate has a longitudinal opening, and a second nut is provided in the longitudinal opening, and the second fastening bolt is fixedly connected to the second nut.

[0012] Preferably, the screw rotation mechanism is further provided with a lifting slide, which drives the rotation motor, torque sensor and screw clamping assembly to move up and down along the Z-axis. The lifting slide is driven by a cylinder or a motor screw.

[0013] Preferably, the base has a through hole in the center, and the device further includes a tensile testing component located below the fixing mechanism. The tensile testing component includes a tensile sensor and a tensile connector. The tensile connector extends into the through hole and is connected to the tail of the drill screw to be tested, which can simultaneously test the performance of the screw under the combined action of torsional load and tensile load.

[0014] Preferably, the end of the horizontal clamping arm is provided with a suction cup, and the horizontal clamping arm is telescopic.

[0015] Preferably, the device is further provided with a control unit, which is electrically connected to the rotating motor, torque sensor, each cylinder and tensile testing component, and can control the screw to tighten in forward and reverse cycles, and record the torque data and tensile data each time.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a multi-cylinder linkage automated clamping mechanism to replace the traditional manual clamping plate adjustment, which can quickly complete the clamping and loosening of the test piece, and perform multiple tests in the length and width directions of the test plate, adapting to batch continuous testing, greatly improving testing efficiency, and the clamping force is uniform and stable, avoiding human operation errors.

[0017] (2) It can realize multi-cycle torque testing of screw tightening-loosening-re-tightening. Combined with the automatic displacement function of the plate under test, it can comprehensively evaluate the torque stability of the screw under repeated tightening conditions. The test data is more comprehensive and more in line with the actual use scenario.

[0018] (3) It integrates torque detection and tensile force detection functions, and can simultaneously collect the tightening torque and axial tensile force of the flow drill screw, and truly simulate the combined stress conditions in actual assembly. This solves the problem of single load detection and large data deviation in the existing device, and the detection results are more accurate and reliable.

[0019] (4) It is equipped with a rotatable and telescopic adjustable vertical clamping arm, which, together with the adjustable fixing structure on the base, can not only complete the testing of flat plate materials, but also stably clamp complex three-dimensional structural parts, adapting to the diverse test requirements of electric vehicles and having a wider range of applications.

[0020] (5) Full-process automated control, which can automatically complete the entire process of clamping, testing, data acquisition and release, reducing the intensity of manual operation, and the test data is traceable and comparable, fully meeting the standardized testing requirements of the electric vehicle industry. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of a flow drill screw torque testing device for electric vehicles is provided for some embodiments of this application; Figure 2 A schematic diagram of the overall structure of the fixing mechanism in a flow drill screw torque testing device for electric vehicles is provided for some embodiments of this application; Figure 3 for Figure 2 Top view; Figure 4 This is a schematic diagram of a fixed mechanism from another perspective; Figure 5 for Figure 4 Top view; Figure 6 for Figure 5 Sectional view at point AA; Figure 7 This is a structural schematic diagram of the fixed mechanism from another perspective; Figure 8 This is a schematic diagram of the specific structure of the telescopic connecting rod.

[0022] Icons: 1. Base; 2. Fixing mechanism; 21. First clamping plate; 211. Groove; 212. Guide hole; 213. Second opening; 22. Second clamping plate; 221. Longitudinal opening; 23. Third clamping plate; 231. First slide rail; 24. Clamping block; 241. First opening; 25. First cylinder; 251. Telescopic rod; 26. Second cylinder; 27. Third cylinder; 28. Fourth cylinder; 281. Push rod; 29. ​​Fixing plate; 291. Third opening; 3. Screw turning mechanism; 4. Vertical clamping arm; 41. Telescopic connecting rod; 42. Horizontal clamping arm; 43. Suction cup; 5. First fastening bolt; 6. Second fastening bolt; 7. Second slide rail. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0024] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0025] See appendix Figure 1-8 The present application proposes a torque testing device for a flow drill screw for electric vehicles, including a base 1, a fixing mechanism 2 and a screw rotation mechanism 3. The fixing mechanism 2 is disposed on the base 1, and is used to fix the plate to be tested, so as to ensure that the plate does not shift, shake or loosen during the test, and to ensure that the torque test data is true and accurate.

[0026] The fixing mechanism 2 is equipped with a vertical clamping arm 4, which can assist in fixing complex three-dimensional structural parts commonly found in the electric vehicle field from multiple angles and positions. This effectively improves the clamping stability of irregular parts, shell parts, and bracket-type three-dimensional objects, making the device suitable for both conventional planar plate testing and the testing needs of diverse three-dimensional parts in actual production.

[0027] The screw rotation mechanism 3 is used to clamp the flow drill screw and realize forward and reverse tightening and loosening actions, completing multiple rounds of tightening tests through continuous forward and reverse rotation. The screw rotation mechanism 3 has a built-in torque sensor, which can detect and collect the torque value in real time during the tightening process, providing reliable data support for the performance evaluation of the flow drill screw.

[0028] The fixing mechanism 2 adopts a multi-cylinder automatic clamping system, replacing the traditional manual adjustment structure. This allows for rapid clamping, positioning, and loosening of the workpiece under test, significantly improving testing efficiency and clamping consistency. It can automatically displace the workpiece under test, moving not only along the length of the groove 211 but also along its width. Combined with the cyclic forward and reverse rotation of the screw rotation mechanism 3, it enables repeated tightening, loosening, and re-tightening of the flow drill screw, thus comprehensively reflecting the screw's torque stability, friction characteristics, and connection reliability under repeated tightening conditions. The device can also simultaneously collect torque load and axial tensile load, completing combined load detection in the same test process. This more closely reflects the actual stress state of the flow drill screw during actual assembly and use, improving the accuracy and reference value of the test results.

[0029] The base 1 has a through hole in the center. The device also includes a tensile testing component, which is located below the fixing mechanism 2. The tensile testing component includes a tensile sensor and a tensile connector. The tensile connector extends into the through hole and is connected to the tail of the flow drill screw to be tested. The connection is reliable. The axial tensile force is collected simultaneously when the screw is tightened, realizing the synchronous detection of torque load and tensile load, and more realistically reflecting the combined force performance of the flow drill screw in actual use.

[0030] Specifically, the fixing mechanism 2 includes a first clamping plate 21, a second clamping plate 22, a third clamping plate 23, a clamping block 24, and a cylinder assembly. The first clamping plate 21 has a groove 211, and the clamping block 24 is placed in the groove 211. The clamping block 24 is movably disposed inside the groove 211. The clamping block 24 has a first opening 241, and a first fastening bolt 5 is installed on the clamping block 24. The width of the groove 211 is greater than the width of the clamping block 24, providing a reasonable gap and guiding space for the movement of the clamping block 24. In addition to moving along the length direction of the groove 211, it can also move along the width direction of the groove 211. The first clamping plate 21 and the second clamping plate 22 are fixedly connected by the second fastening bolt 6, which facilitates the adjustment of the assembly gap according to the thickness and structure of the plate to be measured.

[0031] The first clamping plate 21 is provided with several guide holes 212 arranged vertically along the groove 211. The guide holes 212 pass through the first clamping plate 21 and extend into the groove 211. The second clamping plate 22 is provided with a first cylinder 25. The output shaft of the first cylinder 25 is fixed with several telescopic rods 251. The telescopic rods 251 cooperate with the guide holes 212. The ends of the telescopic rods 251 cooperate with the clamping blocks 24. The telescopic rods 251 and the guide holes 212 are in one-to-one correspondence and can move smoothly within the guide holes 212. The ends of the telescopic rods 251 abut against the clamping blocks 24, so that the clamping and releasing actions are directly driven by the extension and retraction of the first cylinder 25.

[0032] The third clamping plate 23 is provided with a first slide rail 231 opened along the direction of the groove 211. The second clamping plate 22 is slidably engaged with the third clamping plate 23, so that the second clamping plate 22 can move freely along the direction of the first slide rail 231. The third clamping plate 23 is provided with a second cylinder 26. The output shaft of the second cylinder 26 is fixedly connected to one side of the second clamping plate 22 and is used to drive the second clamping plate 22 to achieve lateral position adjustment to meet the testing needs of different positions of the plate. A fixing plate 29 is provided on one side of the third clamping plate 23. The fixing plate 29 is provided with a third opening 291. A first nut is provided below the third opening 291. The third opening 291 has a certain length and width, giving the first fastening bolt 5 a degree of freedom to install and facilitating the adjustment of the first clamping plate 21. The first fastening bolt 5 passes through the third opening 291 and is fixedly connected to the first nut to achieve positioning and fixing of related components and improve the overall structural rigidity.

[0033] The base 1 is provided with a second slide rail 7, and the third clamping plate 23 is slidably engaged with the base 1. The base 1 is fixedly connected with a third cylinder 27, and the output shaft of the third cylinder 27 is fixedly connected with the third clamping plate 23. It is used to drive the third clamping plate 23 to achieve the position adjustment in the front and back directions. The third cylinder 27 drives the test plate to move left and right, and performs multiple torque tests on the test plate along the vertical direction of the groove. The first clamping plate 21 is provided with a fourth cylinder 28 on one side. The fourth cylinder 28 is fixedly connected with the base 1. The output shaft of the fourth cylinder 28 is provided with a push rod 281. The push rod 281 cooperates with the test plate and can directly act on the test plate. The push rod 281 is located on both sides of the test plate and is used to fix the test plate from the side to maintain accurate and firm clamping.

[0034] The screw rotation mechanism 3 is located above the fixing mechanism 2 and includes a rotation motor, a torque sensor and a screw clamping assembly. The output end of the rotation motor is connected to the torque sensor to provide stable power for screw tightening. The output end of the torque sensor is connected to the screw clamping assembly to transmit torque signals in real time. The screw clamping assembly is used to clamp the flow drill screw, which can firmly clamp the screw and transmit the tightening torque synchronously to ensure the stability and reliability of the test process.

[0035] The first clamping plate 21 is provided with a vertical clamping arm 4. The bottom of the vertical clamping arm 4 is rotatably engaged with the first clamping plate 21. The clamping angle can be freely adjusted according to the shape of the three-dimensional part. The vertical clamping arm 4 includes a telescopic connecting rod 41 and a horizontal clamping arm 42. The telescopic connecting rod 41 uses a sleeve with internal and external threads to cooperate with a fastening nut. It can continuously adjust the clamping height within a certain range and can be locked by the nut after adjustment to ensure clamping strength and positioning stability.

[0036] The clamping block 24 is provided with a first opening 241 and a first fastening bolt 5 is installed on the clamping block 24. A second opening 213 perpendicular to the length direction of the groove 211 is opened on the groove 211. The first fastening bolt 5 passes through the first opening 241, the second opening 213, and the third opening 291 in sequence and is connected to the first nut. After the telescopic rod 251 is adjusted, the clamping block 24 can be fixed by the first fastening bolt 5. It is suitable for multiple measurements of plates of the same width, so that the clamping block 24 maintains good guidance and limit during the movement, and avoids problems such as skewing and movement.

[0037] The second clamping plate 22 has a longitudinal opening 221, and a second nut is provided in the longitudinal opening 221. The second fastening bolt 6 is fixed to the second nut. By adjusting the position of the bolt in the longitudinal opening 221, the relative distance between the first clamping plate 21 and the second clamping plate 22 can be flexibly adjusted to adapt to test plates of different widths and thicknesses, thereby improving the versatility of the device. Under the drive of the third cylinder 27, the extension distance of the first clamping plate 21 is fixed. The second fastening bolt 6 can further adjust the distance of the first clamping plate 21 on this basis to meet the fixing of plates with a larger width.

[0038] The screw rotation mechanism 3 is also equipped with a lifting slide. The lifting slide drives the rotation motor, torque sensor, and screw clamping assembly to move up and down along the Z-axis to realize actions such as screw tightening feed, test reset, and component replacement avoidance. The lifting slide can be driven by a cylinder or a motor screw, ensuring smooth movement and precise positioning to meet the needs of different test cycles.

[0039] The end of the horizontal clamping arm 42 is equipped with a suction cup 43. The suction cup 43 can be made of a flexible and non-slip material, which can flexibly adsorb and fix the surface of the three-dimensional part, avoiding scratching the workpiece. At the same time, the horizontal clamping arm 42 itself is a telescopic structure, which can flexibly adjust the extension length according to the shape and size of the part, further improving the adaptability to clamping complex three-dimensional structures.

[0040] The device also includes a control unit, which is electrically connected to the rotary motor, torque sensor, cylinders, and tensile testing components. This control unit controls the screw's forward and reverse rotation for cyclic tightening and records torque and tensile data for each cycle. It can automatically control the screw's forward and reverse rotation, the number of tightening cycles, the cylinder action sequence, and the start and stop of the test according to a preset program. Simultaneously, it collects, stores, and displays torque and tensile data for each test in real time, facilitating subsequent comparative analysis and quality assessment, and significantly improving the automation level and data traceability of the test.

[0041] When this electric vehicle flow drill screw torque testing device is in operation, the flat plate or complex three-dimensional part to be tested is first placed between the clamping blocks 24 of the first clamping plate 21 of the fixing mechanism 2. The clamping structure is pre-adjusted according to the size of the part to be tested. By tightening or loosening the second fastening bolt 6, the relative distance between the first clamping plate 21 and the second clamping plate 22 is adjusted within the longitudinal opening 221 of the second clamping plate 22 to adapt to parts to be tested with different thicknesses and widths. At the same time, the height of the horizontal clamping arm 42 can be adjusted by rotating the telescopic connecting rod 41 of the vertical clamping arm 4, and the three-dimensional part is flexibly adsorbed and fixed by the end suction cup 43 to ensure the stability of the clamping of three-dimensional structures such as irregular parts and shell parts.

[0042] After the device is started, the control unit issues a command, and the third cylinder 27 drives the third clamping plate 23 to move along the second slide rail 7 on the base 1, causing the first clamping plate 21 to move closer to the side of the plate to be tested, achieving initial positioning and lateral clamping. The first cylinder 25 is activated, pushing the telescopic rod 251 to extend along the guide hole 212 of the first clamping plate 21, pushing the clamping block 24 to move in the groove 211, further clamping and fixing the plate to be tested. After the position of the clamping block 24 is adjusted to the correct position, the first fastening bolt 5 passes through the first opening 241 of the clamping block 24, the second opening 213 of the groove 211 and the third opening 291 of the fixing plate 29 in sequence and is locked with the first nut, so that the clamping block 24 is kept in a fixed state, which facilitates continuous batch testing of plates of the same specification.

[0043] After the workpiece is fixed, the screw rotation mechanism 3 moves downward along the Z-axis under the drive of the lifting slide. The screw clamping assembly clamps the flow drill screw to be tested, aligns it with the preset installation position on the plate, and then the rotating motor starts and rotates in the forward direction. The torque sensor drives the screw clamping assembly and the flow drill screw to rotate synchronously, completing the tightening operation. During this process, the torque sensor collects the dynamic torque value in real time during the tightening process. The tensile testing assembly under the base 1 is connected to the tail of the flow drill screw through the tensile connector, and synchronously collects the axial tensile force on the screw, realizing the synchronous detection of torque load and tensile load, and realistically simulating the combined force conditions in actual assembly.

[0044] After a single tightening test is completed, the rotating motor rotates in the opposite direction, causing the flow drill screw to loosen and retract. The fourth cylinder 28 and the second cylinder 26 push the test plate to move along the length of the groove 211, automatically switching to the next test point. The third cylinder 27 drives the test plate to move left and right, performing multiple torque tests on the test plate along the vertical direction of the groove. Then, the lifting slide descends again, and the rotating motor repeats the forward tightening action, thus realizing the cyclic torque test of the flow drill screw through multiple tightening, loosening, and tightening. After the test is completed, the first cylinder 25 drives the telescopic rod 251 to retract, loosening the first fastening bolt 5. The clamping block 24 releases the test piece, allowing the plate or three-dimensional part to be removed, completing a complete flow drill screw torque and combined load test.

[0045] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0046] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] 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.

Claims

1. A torque testing device for a flow drill screw used in electric vehicles, comprising a base (1), a fixing mechanism (2), and a screw rotation mechanism (3), characterized in that, The fixing mechanism (2) is mounted on the base (1). The fixing mechanism (2) is used to fix the plate to be tested. The fixing mechanism (2) is equipped with a vertical clamping arm (4). The vertical clamping arm (4) is used to fix the three-dimensional object. The screw rotating mechanism (3) is used to clamp the flow drill screw and realize forward and reverse tightening and loosening actions. The screw rotating mechanism (3) has a built-in torque sensor, which can detect and collect the torque value during the tightening process in real time. The fixing mechanism (2) adopts multi-cylinder automatic clamping, which can drive the plate to be tested to move automatically. With the cyclic forward and reverse rotation of the screw rotating mechanism (3), the cyclic torque test of the flow drill screw is realized by tightening, loosening and tightening multiple times, and the torque load and tensile load are detected simultaneously. The fixing mechanism (2) includes a first clamping plate (21), a second clamping plate (22), a third clamping plate (23), a clamping block (24), and a cylinder assembly. The first clamping plate (21) has a groove (211), and the clamping block (24) is placed in the groove (211). The clamping block (24) has a first opening (241), and a first fastening bolt (5) is installed on the clamping block (24). The width of the groove (211) is greater than the width of the clamping block (24). The first clamping plate (21) and the second clamping plate (22) are fixedly connected by a second fastening bolt (6). The first clamping plate (21) has a plurality of guide holes (212) arranged vertically along the groove (211). 212) Penetrates through the first clamping plate (21) and extends into the groove (211). The second clamping plate (22) is provided with a first cylinder (25). The output shaft of the first cylinder (25) is fixed with several telescopic rods (251). The telescopic rods (251) cooperate with the guide hole (212). The end of the telescopic rods (251) cooperates with the clamping block (24). The third clamping plate (23) is provided with a first slide rail (231) opened along the direction of the groove (211). The second clamping plate (22) and the third clamping plate (23) are slidably cooperated. The third clamping plate (23) is provided with a second cylinder (26). The output shaft of the second cylinder (26) is fixedly connected to one side of the second clamping plate (22). The third clamping plate (23) A fixing plate (29) is provided on one side of the first clamping plate (23). The fixing plate (29) has a third opening (291). The first fastening bolt (5) passes through the third opening (291) and is fixedly connected to the first nut. A second slide rail (7) is provided on the base (1). The third clamping plate (23) is slidably engaged with the base (1). A third cylinder (27) is provided on the base (1). The output shaft of the third cylinder (27) is fixedly connected to the third clamping plate (23). A fourth cylinder (28) is provided on one side of the first clamping plate (21). The output shaft of the fourth cylinder (28) is provided with a push rod (281). The push rod (281) is engaged with the plate to be tested. A vertical clamping arm (4) is provided on the first clamping plate (21).The bottom of the vertical clamping arm (4) is rotatably engaged with the first clamping plate (21). The vertical clamping arm (4) includes a telescopic connecting rod (41) and a horizontal clamping arm (42). The telescopic connecting rod (41) uses a sleeve with internal and external threads to engage with a fastening nut, allowing for adjustable clamping height.

2. The torque testing device for a flow drill screw for an electric vehicle according to claim 1, characterized in that, The screw rotation mechanism (3) is located above the fixing mechanism (2) and includes a rotation motor, a torque sensor and a screw clamping assembly. The output end of the rotation motor is connected to the torque sensor, and the output end of the torque sensor is connected to the screw clamping assembly. The screw clamping assembly is used to clamp the flow drill screw.

3. The torque testing device for a flow drill screw for an electric vehicle according to claim 1, characterized in that, The groove (211) has a second opening (213) perpendicular to the length direction of the groove (211). The first fastening bolt (5) passes through the first opening (241), the second opening (213), and the third opening (291) in sequence and is connected to the first nut.

4. The torque testing device for a flow drill screw for an electric vehicle according to claim 1, characterized in that, The second clamping plate (22) has a longitudinal opening (221), and a second nut is provided in the longitudinal opening (221). The second fastening bolt (6) is fixedly connected to the second nut.

5. The torque testing device for a flow drill screw for an electric vehicle according to claim 2, characterized in that, The screw rotation mechanism (3) is also provided with a lifting slide. The lifting slide drives the rotating motor, torque sensor and screw clamping assembly to move up and down along the Z-axis. The lifting slide is driven by a cylinder or a motor screw.

6. The torque testing device for a flow drill screw for an electric vehicle according to claim 1, characterized in that, The base (1) has a through hole in the center. The device also includes a tensile testing component. The tensile testing component is located below the fixing mechanism (2). The tensile testing component includes a tensile sensor and a tensile connector. The tensile connector extends into the through hole and is connected to the tail of the flow drill screw to be tested. The mechanical properties of the screw can be detected simultaneously under the combined action of torque load and axial tensile load.

7. The torque testing device for a flow drill screw for an electric vehicle according to claim 1, characterized in that, The horizontal clamping arm (42) is equipped with a suction cup (43) at its end, and the horizontal clamping arm (42) is telescopic.

8. The torque testing device for a flow drill screw for an electric vehicle according to claim 2, characterized in that, The device is also equipped with a control unit, which is electrically connected to the rotating motor, torque sensor, each cylinder and tensile testing component, and can control the screw to tighten in both forward and reverse cycles, and record the torque and tensile data for each cycle.

Images