Length inspection tool for battery box frame

Abstract

The application discloses a length inspection tool for a battery box frame, and relates to the technical field of length inspection, comprising: a feeding module for storing and outputting the battery box frame to be inspected; a double-track conveying module, the input end of which is connected to the output end of the feeding module, for conveying the battery box frame forward; a clamping mechanism, one set of which is installed on each mounting frame, for clamping and fixing the battery box frame conveyed to the front end from both sides; and a length inspection module installed on the fixing frame, for measuring the length of the battery box frame after the angle is adjusted by the turning mechanism. The length inspection tool for the battery box frame adopts a step-by-step clamping structure, which not only solves the interference problem between clamping and detection, realizes non-shielding accurate detection, and guarantees the stability and reliability of the workpiece, but also adapts to various specifications, realizes omnibearing detection inside and outside, and has high universality, high precision and high automation degree.

Description

Technical Field

[0001] This invention relates to the field of length inspection technology, specifically to a tooling for inspecting the length of a battery box frame. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the battery box, as the core load-bearing component of the battery module, directly determines the assembly stability and overall vehicle safety through its structural precision. The length of the battery box frame serves as a critical assembly benchmark, decisively influencing assembly clearances, sealing performance, and structural strength. Therefore, high-precision and high-efficiency length inspection is required to meet the full inspection needs of mass production. Currently, battery box frames are mostly made of lightweight materials such as aluminum alloys, resulting in complex structures and diverse specifications. With the iterative upgrades of new energy vehicle models, the length, width, and internal structure of frames vary significantly across different models, placing higher demands on the adaptability and versatility of inspection tooling. Traditional inspection methods are no longer sufficient to keep pace with the industry's development.

[0003] Current battery box frame length inspection methods rely heavily on manual inspection or simple tooling, which has many drawbacks. For example, manual inspection is inefficient, requiring a long time to inspect each frame, and is highly subjective, with inconsistent operating standards among different inspectors, leading to missed or false inspections. This makes it difficult to meet the full inspection requirements of mass production. In addition, labor costs are high, and continuous operation is not possible. Simple tooling is mostly a fixed structure with an unreasonable clamping mechanism design. The use of a single clamping method can easily lead to interference between clamping and inspection. Either the inspection area is obstructed to ensure clamping stability, preventing the inspection from proceeding smoothly, or clamping stability is sacrificed to reserve inspection space, causing the frame to loosen or shift during inspection, affecting the inspection accuracy.

[0004] Therefore, we propose a tooling for inspecting the length of the battery box frame to solve the problems mentioned above. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve: The purpose of this invention is to provide a tooling for inspecting the length of a battery box frame, in order to solve the problems currently found in the market as described in the background.

[0006] 2. Technical Solution: To achieve the above objectives, the present invention provides the following technical solution: a tooling for inspecting the length of a battery box frame, comprising: The feeding module is used to store and output the battery box frame to be inspected; The dual-track conveyor module has its input end connected to the output end of the feeding module, and is used to convey the battery box frame forward. Two sets of mounting brackets are respectively fixed to the left and right sides of the front end of the dual-rail conveyor module frame; Clamping mechanism: Each set of mounting brackets is equipped with a clamping mechanism, which is used to clamp and fix the battery box frame conveyed to the front end from both sides; A steering mechanism is disposed between the two sets of mounting brackets and located at the front center of the dual-rail conveyor module frame. The steering mechanism is used to support the clamped battery box frame and drive it to rotate and adjust the angle. The fixing frame is installed on the front right side of the dual-rail conveyor module; A length inspection module, installed on the fixed frame, is used to measure the length of the battery box frame after the angle has been adjusted by the steering mechanism. The clamping mechanism includes a first clamping plate, a second clamping plate, a third clamping plate, and a fourth clamping plate. The first clamping plate and the third clamping plate cooperate to form a first clamping position, and the second clamping plate and the fourth clamping plate cooperate to form a second clamping position, so as to adapt to battery box frames of different specifications or different clamping stages.

[0007] Furthermore, the feeding module includes a support frame, a linear motion module, a movable frame, and several storage partitions; The support frame is sleeved and installed on the outer rear end of the dual-rail conveyor module; The linear motion module is mounted vertically on the support frame; The movable frame is fixedly connected to the output end of the linear motion module; Several storage partitions are installed at equal intervals on the inner walls of the left and right sides of the movable frame, and the storage partitions on the left and right sides are arranged one-to-one to support the battery box frame.

[0008] The above technical solution allows several battery box frames to be vertically layered and stored on a movable frame. As the linear motion module moves, they are sequentially placed onto the dual-track conveyor module, achieving orderly feeding.

[0009] Furthermore, the clamping mechanism also includes a drive motor, a transmission component, three guide gears, and four slide bars; The drive motor is mounted on the mounting bracket; All three guide gears are mounted on the mounting bracket via bearings, and the three guide gears are spaced apart along the front-to-back direction; The input end of the transmission component is connected to the output end of the drive motor, and the output end of the transmission component is connected to the guide gear located in the middle. All four slide bars are slidably mounted on the mounting frame, and the four slide bars and three guide gears are staggered. The ends of the four slide bars near the center of the dual-rail conveying module are fixedly connected to the first clamping plate, the second clamping plate, the third clamping plate and the fourth clamping plate from back to front.

[0010] The above technical solution enables the drive motor to rotate the guide gear located in the middle by means of the transmission components after the drive motor is started.

[0011] Furthermore, the transmission component includes a worm and a worm wheel, both of which are mounted on the mounting bracket via bearings. The worm is connected to the output end of the drive motor, and the worm wheel is coaxially and fixedly connected to the guide gear located in the middle position. The worm and the worm wheel mesh with each other.

[0012] The above technical solution improves the self-locking performance by using the transmission components that are configured with worm gear and worm wheel, thus preventing the workpiece from loosening during the testing process.

[0013] Furthermore, each of the four slide bars is equipped with a rack on the side wall near the guide gear. The rack meshes with the corresponding guide gear, so that when the guide gear rotates, it drives the four slide bars to move synchronously in opposite directions.

[0014] The above technical solution enables the four sliders to move synchronously when the guide gear of the final press rotates, and the two adjacent sliders move in opposite directions.

[0015] Furthermore, the steering mechanism includes a hydraulic cylinder mounted on the dual-rail conveyor module frame. A base plate is fixed to the output end of the hydraulic cylinder. A control motor is mounted on the upper end of the base plate. A base plate is mounted on the output end of the control motor. The base plate is used to lift and drive the clamped battery box frame to rotate.

[0016] The above technical solution enables the hydraulic cylinder to move the frame up and down, while simultaneously allowing the control motor to rotate it.

[0017] Furthermore, the length inspection module includes a moving module, an adjusting component, and a detection mechanism; The mobile module is mounted on the fixed frame; The adjusting component is installed at the output end of the moving module; The detection mechanism includes two detection rods, both of which are mounted on the output end of the adjusting member. The adjusting member is used to adjust the distance between the two detection rods.

[0018] The above technical solution enables the detection mechanism to be moved spatially using the movable module and adjustment components.

[0019] Furthermore, the moving module includes an X-axis motion module mounted on the fixed frame, and a Z-axis motion module is mounted on the output end of the X-axis motion module. The output end of the Z-axis motion module is connected to the adjusting member.

[0020] The above technical solution enables the adjusting component to move along the X and Z axes.

[0021] Furthermore, the adjusting component includes a crossbeam fixedly connected to the output end of the Z-axis motion module. A stepper motor is mounted on the crossbeam, and a bidirectional threaded rod is keyed to the output end of the stepper motor. The two ends of the bidirectional threaded rod are respectively threaded to two detection rods, and the detection rods are slidably connected to the inner wall of the crossbeam.

[0022] The above technical solution enables the two detection rods to move relative to each other and adjust their spacing when the stepper motor is started.

[0023] Furthermore, a rotary cylinder is installed at the lower end of the detection rod, and a detection support rod is connected to the output end of each rotary cylinder; One of the detection rods is equipped with a distance sensor 1 at its upper end, and the two detection rods are equipped with a distance sensor 2 and a distance sensor 3 at their lower ends, respectively. The distance sensors are used to measure the length of the battery box frame.

[0024] The above technical solution enables the detection support rod to rotate via a rotary cylinder, thereby adjusting the detection angle and expanding the detection range.

[0025] 3. Beneficial effects: Compared with the prior art, the battery box frame length inspection fixture of this invention adopts a step-by-step clamping structure, which not only solves the problem of interference between clamping and detection, achieving unobstructed and accurate detection, but also ensures the stability and reliability of the workpiece; the multi-axis adjustable detection module is compatible with various specifications, can perform omnidirectional internal and external detection, and has strong versatility, high precision, and high degree of automation. Its specific details are as follows: (1) When the frame reaches the designated position, the clamping mechanism on both sides starts to work. The drive motor drives the central guide gear to rotate through the worm gear transmission component, thereby driving the meshing rack and slide bar around the perimeter to move, thereby driving the four clamping plates to move synchronously towards each other. According to the specifications or process requirements of the frame, the system can control the clamping plate to be first positioned and clamped by the first clamping plate and the third clamping plate to form the first clamping position. At this time, the area of ​​the second clamping plate is in an open state, providing an unobstructed detection window for the length inspection module. The distance sensor can directly and without obstacles complete the length detection, which structurally solves the technical contradiction of mutual interference between clamping and detection. When it is necessary to perform length detection on the part of the first clamping position, the second clamping plate and the fourth clamping plate will perform a second positioning and clamping to form the second clamping position, and supplement the inspection of the part of the first clamping position or other parts that need to be inspected. At the same time, the self-locking performance is good under the action of the transmission component, preventing the workpiece from loosening during the inspection process. (2) During the clamping and inspection process, the steering mechanism can adjust the posture of the frame. The hydraulic cylinder drives the base plate to move up and down to lift and adjust the height of the frame. At the same time, it controls the motor to drive the base plate to rotate, which drives the frame to rotate to the set angle. This satisfies the detection of the length and key dimensions of the battery box frame at different sides, angles and positions, and significantly improves the detection range and applicability of the tooling. (3) The length inspection module is equipped with an X-axis motion module, a Z-axis motion module and an adjustment component driven by a bidirectional threaded rod. It can flexibly adjust the spatial position and inspection spacing of the inspection mechanism, adapt to battery box frames of different lengths, widths and models, and has strong versatility and convenient specification switching, reducing equipment modification costs. At the same time, it is equipped with a rotatable inspection support rod, which can be inserted into the battery box frame for inspection, realizing all-round inspection of external dimensions and internal length, further expanding the inspection range and improving the integrity and applicability of inspection. (4) The vertically layered material feeding module is adopted. Through the linear motion module and multi-layer storage partitions, batch storage and automatic orderly feeding can be achieved without frequent manual feeding, reducing manual intervention and improving the continuous operation capability and overall testing efficiency of the production line. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the feeding module of the present invention. Figure 3 This is a side view of the mounting bracket structure of the present invention; Figure 4 This is a schematic diagram of the clamping mechanism of the present invention; Figure 5 This is a top view of the guide gear structure of the present invention; Figure 6 This is a schematic diagram of the steering mechanism structure of the present invention; Figure 7 This is a schematic diagram of the mobile module structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the movable frame of the present invention.

[0027] In the diagram: 1. Feeding module; 11. Support frame; 12. Linear motion module; 13. Movable frame; 14. Storage partition; 2. Dual-rail conveyor module; 3. Mounting frame; 4. Clamping mechanism; 41. Drive motor; 42. Transmission component; 421. Worm gear; 422. Worm wheel; 43. Guide gear; 44. Sliding bar; 45. Rack; 46. First clamping plate; 47. Second clamping plate; 48. Third clamping plate; 49. Fourth clamping plate; 5. Steering mechanism. Mechanism; 51. Hydraulic cylinder; 52. Base plate; 53. Control motor; 54. Base plate; 6. Fixing frame; 7. Moving module; 71. X-axis motion module; 72. Z-axis motion module; 8. Adjusting component; 81. Cross frame; 82. Stepper motor; 83. Bidirectional threaded rod; 9. Detection mechanism; 91. Detection rod; 92. Distance sensor one; 93. Rotary cylinder; 94. Detection support rod; 95. Distance sensor two; 96. Distance sensor three. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0029] Please see Figure 1-8 This invention provides a technical solution: a length inspection fixture for a battery box frame, comprising: a feeding module 1 for storing and outputting the battery box frame to be inspected; a dual-rail conveying module 2, the input end of which is connected to the output end of the feeding module 1 for conveying the battery box frame forward; the feeding module 1 includes a support frame 11, a linear motion module 12, a movable frame 13, and several storage partitions 14; the support frame 11 is sleeved and installed on the outer rear end of the dual-rail conveying module 2; the linear motion module 12 is vertically installed on the support frame 11; the movable frame 13 is fixedly connected to the output end of the linear motion module 12; several storage partitions 14 are equally spaced and installed on the inner walls of the left and right sides of the movable frame 13, and the storage partitions 14 on the left and right sides are arranged one-to-one to support the battery box frame; Multiple battery box frames to be inspected are neatly stacked by manual labor or a robotic arm on storage partitions 14 on both sides of the movable frame 13. After the dual-rail conveyor module 2 completes the conveying of the previous frame and returns to the standby position, the control system issues a feeding command. The linear motion module 12 starts and drives the movable frame 13 to descend precisely vertically along the guide rail of the support frame 11 until the bottom surface of the bottom battery box frame is exactly flush with the track plane of the dual-rail conveyor module 2. Then it descends again, causing the battery box frame to separate from the corresponding storage partition 14. The dual-rail conveyor module 2 starts and uses friction to pull the frame smoothly out from between the storage partitions 14 on the left and right sides. After completing a single discharge, the linear motion module 12 starts again. This cycle repeats until all frames on the movable frame 13 have been conveyed. This allows for batch storage and automatic orderly feeding without frequent manual feeding, reducing manual intervention and improving the continuous operation capability and overall inspection efficiency of the production line. Two sets of mounting brackets 3 are fixed to the left and right sides of the front end of the double-rail conveying module 2 frame, respectively. Each set of mounting brackets 3 is equipped with a clamping mechanism 4, which clamps and fixes the battery box frame conveyed to the front end from both sides. The clamping mechanism 4 includes a first clamping plate 46, a second clamping plate 47, a third clamping plate 48, and a fourth clamping plate 49. The first clamping plate 46 and the third clamping plate 48 cooperate to form a first clamping position, and the second clamping plate 47 and the fourth clamping plate 49 cooperate to form a second clamping position, adapting to battery box frames of different specifications or clamping stages. The clamping mechanism 4 also includes a drive motor 41, a transmission component 42, three guide gears 43, and four slide bars 44. The drive motor 41 is mounted on the mounting bracket 3. The three guide gears 43 are all mounted on the mounting bracket 3 via bearings, and the three guide gears 43 are spaced apart along the front-rear direction. The input end of the transmission component 42 is connected to the output end of the drive motor 41. The output end of the transmission component 42 is connected to the guide gear 43 located in the middle; four slide bars 44 are all slidably mounted on the mounting bracket 3, and the four slide bars 44 and three guide gears 43 are staggered. The ends of the four slide bars 44 near the center of the dual-rail conveying module 2 are fixedly connected to the first clamping plate 46, the second clamping plate 47, the third clamping plate 48 and the fourth clamping plate 49 from back to front; the transmission component 42 includes a worm gear 421 and a worm wheel 422. Both the worm gear 421 and the worm wheel 422 are mounted on the mounting bracket 3 via bearings, and the worm 421 is connected to the output end of the drive motor 41. The worm wheel 422 is coaxially and fixedly connected to the guide gear 43 located in the middle position, and the worm 421 and the worm wheel 422 mesh with each other. Each of the four slide bars 44 has a rack 45 installed on its side wall near the guide gear 43. The rack 45 meshes with the corresponding guide gear 43, so that when the guide gear 43 rotates, it drives the four slide bars 44 to move synchronously in opposite directions or in opposite directions. Once the battery box frame arrives at the designated front-end station via the dual-rail conveyor module 2, the clamping mechanism 4 on the two side mounting frames 3 is activated. The drive motor 41 outputs power to rotate the worm gear 421. Through the meshing transmission of the worm gear 421 and worm wheel 422, the power is transmitted to the coaxially fixed central guide gear 43. The linkage of the gear system then drives the surrounding racks 45 meshing with it to move. Since the four slide bars 44 are fixedly connected to the racks 45 and staggered between the three guide gears 43, the rotation of the gears forces the four slide bars 44 to move synchronously and precisely towards each other along the mounting frame 3, thereby displacing the corresponding clamping plates. During this process, the system adjusts the movement according to the frame specifications or process. The requirement is to implement a step-by-step clamping strategy. First, the first clamping plate 46 and the third clamping plate 48 make priority contact with the frame to form the first clamping position, achieving initial positioning and reserving an unobstructed detection window in the area of ​​the second clamping plate 47 for the length inspection module to operate. After the external inspection is completed, the clamping action continues or is restarted a second time, with the second clamping plate 47 and the fourth clamping plate 49 clamping the frame to form the second clamping position, locking the frame, and supplementing the inspection of the first clamping position or other parts that need to be inspected. This solves the problem of spatial interference between clamping fixation and internal inspection, and the self-locking transmission based on the single motor driven worm gear 422 and worm 421 ensures the safety of power failure self-locking. The steering mechanism 5 is located between the two sets of mounting frames 3 and at the front center of the double-rail conveying module 2 frame. The steering mechanism 5 is used to support the clamped battery box frame and drive it to rotate and adjust the angle. The steering mechanism 5 includes a hydraulic cylinder 51 mounted on the double-rail conveying module 2 frame. The output end of the hydraulic cylinder 51 is fixed with a base plate 52. The upper end of the base plate 52 is equipped with a control motor 53. The output end of the control motor 53 is equipped with a base plate 54. The base plate 54 is used to lift and drive the clamped battery box frame to rotate. After the length inspection on one side is completed, the steering mechanism 5 located in the middle of the front end of the dual-rail conveyor module 2 immediately engages. First, the hydraulic cylinder 51 starts and extends the piston rod, driving the base plate 52 to rise smoothly in the vertical direction. Then, the control motor 53 installed on the base plate 52 starts and drives the base plate 54 and the battery box frame above it to rotate precisely around the vertical axis through the output shaft, thereby adjusting the inspection surface or processing surface of the frame to the optimal working position, realizing seamless angle switching of the frame between multiple workstations, and providing a flexible and stable posture basis for subsequent dimensional inspection or processing procedures. A fixed frame 6 is installed on the front right side of the dual-rail conveyor module 2; a length inspection module is installed on the fixed frame 6 and is used to measure the length of the battery box frame after the angle is adjusted by the steering mechanism 5; the length inspection module includes a moving module 7, an adjusting component 8, and a detection mechanism 9; the moving module 7 is installed on the fixed frame 6; the adjusting component 8 is installed on the output end of the moving module 7; the detection mechanism 9 includes two detection rods 91, both of which are installed on the output end of the adjusting component 8, and the adjusting component 8 is used to adjust the distance between the two detection rods 91; the moving module 7 includes an X-axis motion module 71 installed on the fixed frame 6, and a Z-axis motion module 72 is installed on the output end of the X-axis motion module 71, the output of the Z-axis motion module 72... The end is connected to the adjusting component 8; the adjusting component 8 includes a crossbeam 81 fixedly connected to the output end of the Z-axis motion module 72, a stepper motor 82 is mounted on the crossbeam 81, the output end of the stepper motor 82 is keyed to a bidirectional threaded rod 83, the two ends of the bidirectional threaded rod 83 are respectively threaded to two detection rods 91, the detection rods 91 are slidably connected to the inner wall of the crossbeam 81; a rotary cylinder 93 is mounted on the lower end of the detection rod 91, and a detection support rod 94 is connected to the output end of each rotary cylinder 93; a distance sensor 1 92 is mounted on the upper end of one of the detection rods 91, and a distance sensor 2 95 and a distance sensor 3 96 are respectively mounted on the lower ends of the two detection support rods 94. The distance sensors are used to measure the length of the battery box frame. After the battery box frame to be inspected is fixed, the length inspection module on the mounting bracket 6 immediately starts the comprehensive measurement program. First, the moving module 7 works in coordination, with the X-axis motion module 71 driving the overall mechanism to approach the side of the frame horizontally. Then, the Z-axis motion module 72 drives the adjusting component 8 to rise and fall vertically, adjusting the two detection rods 91 to the optimal height flush with the upper and lower edges of the frame or a specific measurement reference surface. Next, the stepper motor 82 in the adjusting component 8 drives the bidirectional threaded rod 83 to rotate at high speed, using its bidirectional thread characteristics to force the two detection rods 91 to slide synchronously towards or away from each other, automatically adapting to frame widths and preset the initial measurement span. Simultaneously, the rotary cylinder 93 installed at the lower end of the detection rod 91 is activated, driving the detection support rod 94 to rotate, thereby facilitating the inspection of the internal cavity length of the battery box frame. Finally, the system enters the high-precision data acquisition stage. The distance sensor 1 92 located above monitors the reference distance in real time, while the distance sensor 2 95 and distance sensor 3 96, which are deep inside or attached to the end face, respectively collect displacement data of the two ends or key points inside and outside the frame and upload the data to the system to complete the verification of the total external length and internal clearance length of the frame, eliminating the spatial blind spots of traditional fixed detection and ensuring the integrity and high reliability of the battery box frame size data.

[0030] Working principle: When using this fixture to inspect the length of the battery box frame, such as... Figure 1-8As shown, the frames to be tested are first stacked on the storage partition 14. The linear motion module 12 drives the movable frame 13 to descend, making the bottom frame flush with and separate from the double-rail conveyor module 2, and then pulled out by the double-rail conveyor module 2. After the frame arrives at the front end, the clamping mechanism 4 is activated. The drive motor 41 drives the central guide gear 43 to rotate via the worm gear 421 and worm wheel 422. The linkage rack 45 drives the four slide bars 44 and the clamping plates to move synchronously in opposite directions. First, the first clamping plate 46 and the third clamping plate 48 form the first clamping position reserved detection window. Then, the length inspection module is activated, and the moving module 7 and the adjusting component 8 adjust the position of the detection mechanism 9. The distance sensor is used to complete the size verification. At the same time, the detection support rod 94 can be rotated to perform length inspection on the inside of the frame. After the inspection, the second clamping plate 47 and the fourth clamping plate 49 form the second clamping position and lock it, and a supplementary inspection is performed. Subsequently, the hydraulic cylinder 51 of the steering mechanism 5 lifts the base plate 52, and the control motor 53 drives the base plate 54 to rotate the frame to the angle to be measured, thereby widening the detection range.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tooling for inspecting the length of a battery box frame, characterized in that, include: The feeding module (1) is used to store and output the battery box frame to be inspected; The dual-track conveying module (2) has its input end connected to the output end of the feeding module (1) and is used to convey the battery box frame forward. Two sets of mounting brackets (3) are fixed to the left and right sides of the front end of the frame of the dual-rail conveying module (2); Clamping mechanism (4), each set of mounting brackets (3) is equipped with a clamping mechanism (4), the clamping mechanism (4) is used to clamp and fix the battery box frame conveyed to the front end from both sides; The steering mechanism (5) is located between the two sets of mounting brackets (3) and at the front center of the double-rail conveying module (2) frame. The steering mechanism (5) is used to support the clamped battery box frame and drive it to rotate to adjust the angle. A fixing frame (6) is installed on the right side of the front end of the dual-rail conveyor module (2); The length inspection module is installed on the fixed frame (6) and is used to measure the length of the battery box frame after the angle is adjusted by the steering mechanism (5); The clamping mechanism (4) includes a first clamping plate (46), a second clamping plate (47), a third clamping plate (48), and a fourth clamping plate (49). The first clamping plate (46) and the third clamping plate (48) cooperate to form a first clamping position, and the second clamping plate (47) and the fourth clamping plate (49) cooperate to form a second clamping position, so as to adapt to battery box frames of different specifications or different clamping stages.

2. The length inspection fixture for a battery box frame according to claim 1, characterized in that: The feeding module (1) includes a support frame (11), a linear motion module (12), a movable frame (13), and several storage partitions (14). The support frame (11) is sleeved and installed on the outer side of the rear end of the double-rail conveying module (2); The linear motion module (12) is mounted vertically on the support frame (11); The movable frame (13) is fixedly connected to the output end of the linear motion module (12); Several storage partitions (14) are installed at equal intervals on the inner walls of the left and right sides of the movable frame (13), and the storage partitions (14) on the left and right sides are arranged in a one-to-one correspondence to support the battery box frame.

3. The length inspection fixture for a battery box frame according to claim 1, characterized in that: The clamping mechanism (4) also includes a drive motor (41), a transmission component (42), three guide gears (43) and four slide bars (44). The drive motor (41) is mounted on the mounting bracket (3); All three guide gears (43) are mounted on the mounting bracket (3) via bearings, and the three guide gears (43) are spaced apart in the front-rear direction; The input end of the transmission component (42) is connected to the output end of the drive motor (41), and the output end of the transmission component (42) is connected to the guide gear (43) located in the middle. All four slide bars (44) are slidably mounted on the mounting frame (3), and the four slide bars (44) and the three guide gears (43) are staggered. The ends of the four slide bars (44) near the center of the double-rail conveying module (2) are fixedly connected to the first clamping plate (46), the second clamping plate (47), the third clamping plate (48) and the fourth clamping plate (49) from back to front.

4. The length inspection fixture for a battery box frame according to claim 3, characterized in that: The transmission component (42) includes a worm (421) and a worm wheel (422). The worm (421) and the worm wheel (422) are both mounted on the mounting bracket (3) by bearings. The worm (421) is connected to the output end of the drive motor (41). The worm wheel (422) is coaxially fixedly connected to the guide gear (43) located in the middle position. The worm (421) and the worm wheel (422) mesh with each other.

5. The length inspection fixture for a battery box frame according to claim 4, characterized in that: Each of the four slide bars (44) has a rack (45) installed on the side wall near the guide gear (43). The rack (45) meshes with the corresponding guide gear (43), so that when the guide gear (43) rotates, it drives the four slide bars (44) to move synchronously towards or away from each other.

6. The length inspection fixture for a battery box frame according to claim 1, characterized in that: The steering mechanism (5) includes a hydraulic cylinder (51) mounted on the frame of the double-rail conveying module (2). The output end of the hydraulic cylinder (51) is fixed with a base plate (52). A control motor (53) is mounted on the upper end of the base plate (52). A base plate (54) is mounted on the output end of the control motor (53). The base plate (54) is used to lift and drive the clamped battery box frame to rotate.

7. The length inspection fixture for a battery box frame according to claim 1, characterized in that: The length inspection module includes a moving module (7), an adjusting component (8), and a detection mechanism (9); The mobile module (7) is mounted on the fixed frame (6); The adjusting component (8) is installed on the output end of the moving module (7); The detection mechanism (9) includes two detection rods (91), both of which are mounted on the output end of the adjusting member (8). The adjusting member (8) is used to adjust the distance between the two detection rods (91).

8. The length inspection fixture for a battery box frame according to claim 7, characterized in that: The moving module (7) includes an X-axis motion module (71) mounted on the fixed frame (6), and a Z-axis motion module (72) is mounted on the output end of the X-axis motion module (71). The output end of the Z-axis motion module (72) is connected to the adjusting member (8).

9. The length inspection fixture for a battery box frame according to claim 8, characterized in that: The adjusting component (8) includes a crossbeam (81) fixedly connected to the output end of the Z-axis motion module (72). A stepper motor (82) is mounted on the crossbeam (81). A bidirectional threaded rod (83) is keyed to the output end of the stepper motor (82). The two ends of the bidirectional threaded rod (83) are respectively threaded to two detection rods (91). The detection rods (91) are slidably connected to the inner wall of the crossbeam (81).

10. The length inspection fixture for a battery box frame according to claim 9, characterized in that: A rotary cylinder (93) is installed at the lower end of the detection rod (91), and a detection support rod (94) is connected to the output end of each rotary cylinder (93). One of the detection rods (91) is equipped with a distance sensor 1 (92) at its upper end, and the two detection rods (94) are equipped with a distance sensor 2 (95) and a distance sensor 3 (96) at their lower ends, respectively. The distance sensors are used to measure the length of the battery box frame.

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