Automatic screw tightening device for battery pack frame bottom guard plate

Abstract

The utility model discloses a battery pack frame bottom guard plate screw automatic tightening device which comprises a rack and a moving module, the moving module comprises a pair of sliding rails, a plurality of portal frames and a plurality of three-axis moving devices, and the battery pack frame bottom guard plate screw automatic tightening device further comprises a conveying module and a screw tightening module, the positioning module is arranged on one side of the conveying module and used for positioning and fixing the battery pack frame bottom protection plate on the conveying module; and the locking module is arranged on the three-axis moving device, and the moving module can drive the locking module to move in the horizontal direction and the vertical direction. The bottom guard plate screw locking device meets the special requirements of battery pack use scenes, greatly improves the working efficiency and the safety, is suitable for screw locking of various bottom guard plates, and meets the requirements of flexible production; meanwhile, a machining station is directly formed above the conveying module, the occupied space and the cost of a matched system are greatly saved, the complexity of the system is reduced, the reliability of the system is improved, the economic benefit is remarkable, and the use scene is wide.

Description

Technical Field

[0001] This utility model relates to the field of automatic locking technology, and in particular to an automatic tightening device for screws on the bottom guard plate of a battery pack frame. Background Technology

[0002] In recent years, the safety protection technology of new energy vehicle battery packs has faced a dual challenge. In terms of passive safety, the battery pack bottom guard plate, as the first line of defense against impacts from road debris, requires high-strength protective structures such as titanium alloy honeycomb panels or ultra-high molecular weight polyethylene composite materials. These materials typically feature over 300 sets of irregularly shaped screw holes (diameter tolerance ±0.05mm) distributed in a grid pattern, achieving stress dispersion through multi-point matrix locking. However, existing assembly processes have significant drawbacks: 1) During manual locking, operators need to output a total torque exceeding 400 N·m on a 1.2m × 2.4m work surface, with a single-station operation taking up to 45 minutes; 2) Handheld power tools cannot guarantee a torque control accuracy of 0.5 N·m, resulting in a potential risk of excessive preload dispersion for 12% of the screws.

[0003] Against the backdrop of intelligent manufacturing upgrades, traditional automation solutions have exposed multi-dimensional bottlenecks: the locking terminals mounted on mainstream six-axis robotic arms suffer from insufficient end-effector repeatability (±0.15mm), making it difficult to match battery tray structures with curved surfaces (radius of curvature R<500mm). More critically, existing vision guidance systems exhibit an error rate as high as 8.3% in recognizing deep-hole screw positions under reflective metal conditions, resulting in an actual utilization rate of less than 65% for automated locking equipment. Furthermore, the industry lacks rapid changeover solutions adapted to mixed-model production lines, with mechanical fixture adjustments taking more than 120 minutes during changeovers.

[0004] From a process quality control perspective, manual fastening has blind spots in torque attenuation monitoring: sampling tests revealed that after three months of use, 17% of the screws on the battery pack bottom cover plate showed a torque drop exceeding the design value by more than 15%, while existing online inspection systems can only cover the first and last piece sampling inspections. More seriously, the contact surfaces of dissimilar materials (such as aluminum alloy frames and carbon steel screws) are prone to fretting wear during manual assembly, leading to increased contact resistance and the risk of localized overheating. This hidden danger cannot be effectively addressed in traditional assembly processes. Utility Model Content

[0005] According to an embodiment of the present invention, an automatic screw tightening device for the bottom guard plate of a battery pack frame is provided, comprising a frame and a moving module. The moving module includes a pair of slide rails, several gantry frames, and several three-axis moving devices, and further includes:

[0006] The transfer module is used to transfer the bottom protective plate of the battery pack frame.

[0007] The positioning module is located on one side of the transmission module and is used to position and fix the bottom protective plate of the battery pack frame on the transmission module.

[0008] The locking module is mounted on the three-axis moving device, and the moving module can drive the locking module to move in the horizontal and vertical directions.

[0009] Furthermore, the transmission module includes:

[0010] Conveyor rails are used to transfer the bottom protective plate of the battery pack frame.

[0011] A guide plate is located on one side of the conveyor track and is used to roughly position the bottom protective plate of the battery pack frame as it enters the conveyor track.

[0012] Furthermore, the positioning module includes:

[0013] The longitudinal positioning module is mounted on the frame and is used for positioning and fixing along the moving direction of the bottom protective plate of the battery pack frame.

[0014] The lateral positioning module is mounted on the frame and is used for positioning and fixing in a direction perpendicular to the moving direction of the bottom protective plate of the battery pack frame.

[0015] Furthermore, the longitudinal positioning module includes:

[0016] A pair of material-stopping cylinders are mounted on the frame;

[0017] The lifting and horizontal pushing cylinder assembly is mounted on the frame, located below the conveying module. The area between the baffle cylinder and the lifting and horizontal pushing cylinder assembly is the processing station for the bottom guard plate of the battery pack frame. The lifting and horizontal pushing cylinder assembly pushes the bottom guard plate of the battery pack frame to the baffle cylinder to complete positioning and fixing.

[0018] Furthermore, the longitudinal positioning module also includes a pair of position sensors, which are respectively set on one side of a pair of baffle cylinders to sense whether the bottom guard plate of the battery pack frame is in place.

[0019] Furthermore, the lifting and horizontal push cylinder assembly includes an electric push rod and a horizontal push cylinder. The horizontal push cylinder is positioned above the electric push rod, which can push the horizontal push cylinder above the conveying module. The horizontal push cylinder can push the bottom guard plate of the battery pack frame towards the baffle cylinder.

[0020] Furthermore, the lateral positioning module includes a pair of side-push cylinders and a pair of stops that are configured in a one-to-one correspondence; the side-push cylinders push the side of the bottom guard plate of the battery pack frame to the stops to complete the positioning and fixation.

[0021] Furthermore, the positioning module also includes a lifting and locking module, which is mounted on the frame and located below the conveying module. It is used to lift and fix the bottom guard plate of the battery pack frame, so that it is detached from the conveying module.

[0022] Furthermore, the lifting and locking edge module consists of a pair of lifting and clamping assemblies respectively located on both sides of the conveying module. The lifting and clamping assemblies include:

[0023] The lifting plate is located below the conveyor module.

[0024] A pair of clamping cylinders are mounted on the lifting plate to clamp the edges of the bottom protective plate of the battery pack frame;

[0025] A positioning post is set on the lifting plate, and it corresponds to the positioning hole on the bottom protective plate of the battery pack frame.

[0026] A pair of lifting cylinders are positioned below a pair of clamping cylinders, under the lifting plate. The pair of lifting cylinders lifts the lifting plate, the pair of clamping cylinders, and the positioning column, and drives the bottom guard plate of the battery pack frame to detach from the conveying module.

[0027] Furthermore, the locking module includes an electric screwdriver and a pair of V-blocks. The three-axis moving device drives the pair of V-blocks to clamp the top of the screw and straighten it. The electric screwdriver is used to tighten the screw.

[0028] The automatic screw tightening device for the bottom guard plate of the battery pack frame according to the present utility model meets the special requirements of the battery pack usage scenario, greatly improves work efficiency and safety, and is adaptable to screw tightening of various bottom guard plates, meeting the requirements of flexible production; at the same time, a processing station is directly formed above the conveying module, which greatly saves the space occupied and the cost of supporting systems, reduces the complexity of the system, increases the reliability of the system, has significant economic benefits, and has a wide range of applications.

[0029] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0030] Figure 1 This is one of the structural schematic diagrams of the automatic screw tightening device for the bottom guard plate of the battery pack frame according to an embodiment of the present utility model;

[0031] Figure 2 This is a second schematic diagram of the automatic screw tightening device for the bottom guard plate of the battery pack frame according to an embodiment of the present utility model;

[0032] Figure 3 This is the third structural schematic diagram of the automatic screw tightening device for the bottom guard plate of the battery pack frame according to an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram showing the arrangement and positional relationship of the baffle cylinder, side push cylinder, and lifting and locking module of the automatic tightening device for the bottom guard plate screws of the battery pack frame according to an embodiment of this utility model.

[0034] Figure 5 for Figures 2-3 Schematic diagram of the central lifting and transverse thrust cylinder assembly;

[0035] Figure 6 This is a schematic diagram showing the arrangement and positional relationship of the lifting and horizontal pushing cylinder assembly of the automatic tightening device for the bottom guard plate screws of the battery pack frame according to an embodiment of the present utility model;

[0036] Figure 7 This is a schematic diagram of the locking module of the automatic screw tightening device for the bottom guard plate of the battery pack frame according to an embodiment of the present utility model;

[0037] Figure 8 for Figure 7 A magnified view of a portion of the image;

[0038] Figure 9 This is a schematic diagram of the lifting and locking module of the automatic tightening device for the bottom guard plate screws of the battery pack frame according to an embodiment of the present invention. Detailed Implementation

[0039] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0040] First, combine Figures 1-9 The present invention describes an automatic screw tightening device for the bottom guard plate of a battery pack frame, which is used for the assembly of the battery pack frame and has a wide range of applications.

[0041] like Figures 1-3 As shown, the automatic screw tightening device for the bottom guard plate of the battery pack frame according to this embodiment of the present invention has a frame 1 and a moving module 2. The moving module 2 has a pair of slide rails 21, several gantry frames 22, and several three-axis moving devices 23, and also has a conveying module 3, a positioning module, and a locking module 5. The conveying module 3 is used to transport the bottom guard plate 6 of the battery pack frame. The positioning module is located on one side of the conveying module 3 to position and fix the bottom guard plate 6 of the battery pack frame on the conveying module 3. The locking module 5 is located on the three-axis moving device 23, and the moving module 2 can drive the locking module 5 to move along the horizontal (X, Y axis) and vertical (Z axis) directions. In this embodiment, each three-axis moving device 23 is provided with a locking module 5, which can realize the simultaneous operation of multiple locking modules 5, and can also freely arrange the locking modules 5 participating in the locking as needed, greatly improving work efficiency and adapting to various types of bottom guard plates of the battery pack frame.

[0042] Specifically, such as Figure 1 As shown, the conveying module 3 has a conveying track 31 and a guide plate 32. The conveying track 31 is used to transfer the battery pack frame bottom protective plate 6, and the guide plate 32 is disposed on one side of the conveying track 31 to provide coarse positioning for the battery pack frame bottom protective plate 6 entering the conveying track 31. In this embodiment, the conveying track 31 uses several parallel conveying rollers.

[0043] Specifically, such as Figures 1-6 As shown, the positioning module has a longitudinal positioning module 41 and a transverse positioning module 42. The longitudinal positioning module 41 is mounted on the frame 1 and positions and fixes the bottom protective plate 6 of the battery pack frame along its moving direction. The transverse positioning module 42 is mounted on the frame 1 and positions and fixes the bottom protective plate 6 of the battery pack frame in a direction perpendicular to its moving direction.

[0044] Furthermore, such as Figures 1-6 As shown, the longitudinal positioning module 41 has a pair of blocking cylinders 411 and a lifting and pushing cylinder assembly 412. The pair of blocking cylinders 411 are mounted on the frame 1, and the lifting and pushing cylinder assembly 412 is mounted on the frame 1, located below the conveying module 3. The area between the blocking cylinders 411 and the lifting and pushing cylinder assembly 412 is the processing station for the bottom protective plate 6 of the battery pack frame. The lifting and pushing cylinder assembly 412 pushes the bottom protective plate 6 of the battery pack frame to the blocking cylinders 411 to complete the positioning and fixing.

[0045] Furthermore, such as Figure 3 , 5 As shown in Figure 6, the lifting and horizontal pushing cylinder assembly 412 has an electric push rod 4121 and a horizontal pushing cylinder 4122. The horizontal pushing cylinder 4122 is located above the electric push rod 4121. The electric push rod 4121 can push the horizontal pushing cylinder 4122 to the top of the conveying module 3. The horizontal pushing cylinder 4122 can push the bottom guard plate 6 of the battery pack frame towards the baffle cylinder 411.

[0046] Furthermore, such as Figure 4 As shown, the longitudinal positioning module 41 also has a pair of position sensors 413, which are respectively set on one side of a pair of baffle cylinders 411 to sense whether the bottom guard plate 6 of the battery pack frame is in place.

[0047] Furthermore, such as Figures 1-4 As shown, the lateral positioning module 42 has a pair of side-push cylinders 421 and a pair of stops 422 that are arranged in a one-to-one correspondence. The side-push cylinders 421 push the side of the bottom guard plate 6 of the battery pack frame to the stops 422 to complete the positioning and fixing.

[0048] Furthermore, such as Figure 3 , 4As shown in Figure 9, the positioning module also has a lifting and locking edge module 43, which is set on the frame 1 and located below the conveying module 3. It lifts and fixes the bottom guard plate 6 of the battery pack frame so that it is separated from the conveying module 3. No additional workstation is required. A temporary processing workstation can be built directly in the area of ​​the conveying module 3. No other subsystems are required. The system complexity is greatly reduced and the reliability is greatly increased. It not only improves work efficiency but also reduces the floor space and equipment investment costs, resulting in significant economic benefits.

[0049] Furthermore, such as Figure 9 As shown, the lifting and locking edge module 43 consists of a pair of lifting and pressing assemblies 431 respectively located on both sides of the conveying module 3. Each assembly includes a lifting plate 4311, a pair of pressing cylinders 4312, a positioning post 4313, and a pair of lifting cylinders 4314. The lifting plate 4311 is located below the conveying module 3. The pair of pressing cylinders 4312 are mounted on the lifting plate 4311 to press the edge of the battery pack frame bottom guard plate 6. The positioning post 4313 is mounted on the lifting plate 4311 and corresponds to the positioning holes on the battery pack frame bottom guard plate 6. The pair of lifting cylinders 4314 are positioned below the pair of pressing cylinders 4312, below the lifting plate 4311. They lift the lifting plate 4311, the pair of pressing cylinders 4312, and the positioning post 4313, thus lifting the battery pack frame bottom guard plate 6 away from the conveying module 3.

[0050] Specifically, such as Figures 7-8 As shown, the locking module 5 has an electric screwdriver 52 and a pair of V-blocks 51. The three-axis moving device 23 drives the pair of V-blocks 51 to clamp the top of the screw and straighten the screw 7, which improves the success rate of screw 7 tightening, increases work efficiency, adapts to the screw 7 locking of various bottom plates, and meets the requirements of flexible production.

[0051] During operation, the battery pack frame bottom guard plate 6 is conveyed to the conveyor track 31 and continues to be conveyed forward via the conveyor track 31. When it is conveyed to the proximity position sensor 413, after either position sensor 413 detects that the battery pack frame bottom guard plate 6 is in place, the lifting and pushing cylinder assembly 412 works to further push the battery pack frame bottom guard plate 6 into place until both position sensors 413 detect the battery pack frame bottom guard plate 6, completing the X-axis positioning. The side pushing cylinder 421 pushes the battery pack frame bottom guard plate 6 to the stop block 422 on the other side. When the magnetic switch of the side pushing cylinder 421 senses that the battery pack frame bottom guard plate 6 is in place, the Y-axis positioning is completed.

[0052] Each of the three-axis moving devices 23 drives the locking module 5 on it to the corresponding screw hole on the bottom guard plate 6 of the battery pack frame. Since the worker only puts the screw 7 into the screw hole first, the V-block 51 is used to precisely position the screw 7 and clamp and straighten it. Then the electric screwdriver 52 completes the cap recognition process, that is, the end sleeve of the electric screwdriver 52 puts on the screw 7 cap, rotates slightly, and completes the docking and recognition with the screw 7 cap before tightening, ensuring that the locking process meets the special requirements of the battery pack usage scenario.

[0053] Above, refer to Figures 1-9 The present invention describes an automatic tightening device for the screws 7 of the bottom guard plate of the battery pack frame according to an embodiment of the present invention. It meets the special requirements of the battery pack usage scenario, greatly improves work efficiency and safety, and is adaptable to the screws 7 of various bottom guard plates, meeting the requirements of flexible production. At the same time, a processing station is directly formed above the conveying module, which greatly saves the floor space and the cost of supporting systems, reduces the complexity of the system, increases the reliability of the system, has significant economic benefits, and has a wide range of applications.

[0054] It should be noted that, in this specification, the terms "comprising," "having," or any other variations thereof are intended to cover a non-exclusive "having," 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. Unless otherwise specified, an element defined by the phrase "having..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0055] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A battery pack frame bottom shield screw automatic tightening device, comprising a rack and a moving module, the moving module comprising a pair of slide rails and a plurality of gantries and a plurality of three-axis moving devices, characterized in that, Also includes: The conveying module is used to transfer the bottom protective plate of the battery pack frame; A positioning module is disposed on one side of the transmission module and is used to position and fix the bottom protective plate of the battery pack frame on the transmission module; A locking module is mounted on the three-axis moving device, and the moving module can drive the locking module to move in the horizontal and vertical directions.

2. The battery pack frame bottom shield screw automatic tightening device of claim 1, wherein, The transmission module includes: A transfer track for transferring the bottom protective plate of the battery pack frame; A guide plate is disposed on one side of the conveying track, and the guide plate is used to coarsely position the bottom protective plate of the battery pack frame as it enters the conveying track.

3. The battery pack frame bottom shield screw automatic tightening device of claim 1, wherein, The positioning module includes: A longitudinal positioning module is mounted on the frame and is used to position and fix the battery pack frame bottom guard plate along the moving direction. A lateral positioning module is mounted on the frame and is used for positioning and fixing in a direction perpendicular to the moving direction of the bottom protective plate of the battery pack frame.

4. The battery pack frame bottom shield screw automatic tightening device of claim 3, wherein, The longitudinal positioning module includes: A pair of material-stopping cylinders, the pair of material-stopping cylinders being mounted on the frame; The lifting and pushing cylinder assembly is mounted on the frame and located below the conveying module. The area between the material blocking cylinder and the lifting and pushing cylinder assembly is the processing station for the bottom guard plate of the battery pack frame. The lifting and pushing cylinder assembly pushes the bottom guard plate of the battery pack frame to the material blocking cylinder to complete positioning and fixing.

5. The battery pack frame bottom shield screw automatic tightening device of claim 4, wherein, The longitudinal positioning module also includes a pair of position sensors, which are respectively disposed on one side of the pair of baffle cylinders to sense whether the bottom guard plate of the battery pack frame is in place.

6. The battery pack frame bottom shield screw automatic tightening device according to claim 4 or 5, characterized in that, The lifting and horizontal pushing cylinder assembly includes an electric push rod and a horizontal pushing cylinder. The horizontal pushing cylinder is located above the electric push rod. The electric push rod can push the horizontal pushing cylinder above the conveying module. The horizontal pushing cylinder can push the bottom guard plate of the battery pack frame towards the material blocking cylinder.

7. The battery pack frame bottom shield screw automatic tightening device of claim 3, wherein, The lateral positioning module includes a pair of side-push cylinders and a pair of stops that are arranged in a one-to-one correspondence; the side-push cylinders push the side of the bottom guard plate of the battery pack frame to the stops to complete the positioning and fixation.

8. The battery pack frame bottom shield screw automatic tightening device of claim 3, wherein, The positioning module further includes a lifting and locking module, which is mounted on the frame and located below the conveying module. The lifting and locking module is used to lift and fix the bottom protective plate of the battery pack frame, so that it is detached from the conveying module.

9. The battery pack frame bottom shield screw automatic tightening device of claim 8, wherein, The lifting and locking edge module is a pair of lifting and pressing assemblies respectively disposed on both sides of the conveying module, and the lifting and pressing assembly includes: A lifting plate, located below the conveying module; A pair of clamping cylinders, which are disposed on the lifting plate, are used to clamp the edge of the bottom protective plate of the battery pack frame; A positioning post is provided on the lifting plate and corresponds to the positioning hole on the bottom protective plate of the battery pack frame. A pair of lifting cylinders are arranged one-to-one below the pair of pressing cylinders, located under the lifting plate. The pair of lifting cylinders lift the lifting plate, the pair of pressing cylinders and the positioning column, and drive the bottom guard plate of the battery pack frame to detach from the conveying module.

10. The battery pack frame bottom shield screw automatic tightening device of claim 1, wherein, The locking module includes an electric screwdriver and a pair of V-blocks. The three-axis moving device drives the pair of V-blocks to clamp the top of the screw and straighten the screw. The electric screwdriver is used to tighten the screw.

Images