New energy automobile battery aluminum shell stretching equipment

Abstract

The present application relates to a kind of new energy automobile battery aluminum shell stretching equipment, including hollow base frame with circular pedestal in top, several forming cavities are arrayed around its axis on circular pedestal, the four sides of each forming cavity top opening are shaped as slope face;Lowering mechanism is provided above circular pedestal, and the lowering mechanism includes several annular array distribution upper die body;Coaxial shaft is provided on circular pedestal and can be rotated and axially lifted, and clamping mechanism for clamping transfer workpiece is provided on shaft;When upper die body goes down to limit position, slope face, forming cavity inner wall, middle shell product top end surface and upper die body outer wall form oil storage gap A between them;When middle shell product goes up alone, oil storage gap B is formed between its outer wall and slope face. Oil storage gap is formed by the slope face structure of forming cavity and upper die body, middle shell product respectively, and the physical constraint oil flow path is limited in the contact surface area of the required lubricated mould and workpiece, to realize infiltration type oiling.

Description

Technical Field

[0001] This invention relates to the field of battery casing processing technology, specifically to a stretching device for aluminum casings of new energy vehicle batteries. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the requirements for forming precision, surface quality, and production efficiency of power battery aluminum casings are continuously increasing. Battery aluminum casings are generally formed using a multi-stage cold drawing process. During the drawing process, the inner and outer walls of the intermediate casing need to be lubricated to reduce flow resistance, suppress cracking and wrinkling defects, and ensure dimensional accuracy and appearance quality of the casing. Currently, the industry mainly uses two lubrication methods: external nozzle oiling and brush oiling.

[0003] When using a spray nozzle for oil application, the oil diffusion range is not effectively constrained during the spraying process. Lubricating oil easily splashes and spreads to the machine frame, transmission mechanism, and surrounding equipment surfaces. Long-term accumulation will cause serious oil pollution, which not only increases the cost of equipment cleaning and maintenance but also easily seeps into electrical components, causing potential malfunctions. At the same time, the oil utilization rate is low, resulting in serious waste of consumables. When using a brush for oil application, the oil film thickness on the shell surface is inconsistent due to brush bristle wear and uneven contact pressure. Localized oil shortages can easily lead to tensile scratches and excessive wall thickness reduction, which will directly affect the yield of finished products.

[0004] In addition, traditional multi-stage stretching equipment mostly adopts a linear workstation layout, which occupies a large space in the length direction, resulting in low factory space utilization and is not conducive to layout in small spaces. Summary of the Invention

[0005] Based on this, this application provides a stretching device for aluminum shells of new energy vehicle batteries, which solves the technical problems of oil splashing pollution and low utilization rate caused by the lack of oil flow path constraint in the oil injection process in the prior art. It has the beneficial effects of suppressing oil pollution, improving oil utilization rate and lubrication uniformity.

[0006] This application provides a new energy vehicle battery aluminum shell stretching device, which includes a hollow base frame with a circular platform on top. Several forming cavities are arrayed around the axis on a circular platform, and the four sides of the top opening of each forming cavity are formed into sloping surfaces. A pressing mechanism is provided above the circular frame. The pressing mechanism includes several upper mold bodies arranged in a ring array. The number and position of the upper mold bodies correspond one-to-one with the forming cavities. A shaft is coaxially mounted on the circular platform. The shaft can rotate around its own axis and move up and down along its own axis. The shaft is evenly distributed with several clamping mechanisms spaced apart around its axis, used to clamp and transfer workpieces; When the upper mold body descends to its limit position, an oil-retaining gap A is formed between the slope surface, the inner side wall of the molding cavity, the top surface of the intermediate shell product, and the outer wall of the upper mold body. When the intermediate shell product moves upwards alone, an oil-storing gap B is formed between its outer wall and the slope surface.

[0007] In one implementation, the bottom of the circular frame has several lower mold bases arranged in a ring around its axis, and each lower mold base and the hollow base frame together form a forming cavity. Each molding cavity is equipped with a sliding pusher seat; Each lower mold base has a through hole at its bottom, and a guide rod A is vertically and slidably installed through each through hole; The top of guide rod A is fixed to the bottom of the corresponding push seat; Spring A is fitted on the outside of each guide rod A. The top end of spring A is fixed to the bottom of the push seat, and the bottom end is fixed to the bottom wall of the forming cavity.

[0008] In one implementation, when the pusher seat moves upward and resets to its limit state, the height of its top surface is lower than the height of the slope surface.

[0009] In one implementation, each lower mold base is provided with a Z-shaped retaining member on the side facing the axis of the circular frame, and a lower pressing arm that presses against the Z-shaped retaining member is fixed on the shaft at the position corresponding to the position of each Z-shaped retaining member. The first state is defined as when the shaft moves upward to its limit position, the second state is defined as when the shaft moves downward to its limit position, and the third state is defined as when the compression between the lower pressure arm and the Z-shaped clamping member completely disappears. In the second state, the lower pressure arm pushes the corresponding Z-shaped clamping component to feed radially along the circular frame. The Z-shaped clamping component can abut against the top end face of the middle shell product to prevent the middle shell product from moving upward synchronously with the upper mold body. In the third state, the Z-shaped retainer automatically resets to remove its obstruction to the middle housing product; When the pusher seat moves to its limit position, the difference between the height of the clamping mechanism in the third state and its height in the first state is greater than the height difference between the top surface of the pusher seat and the upper surface of the circular support.

[0010] In one implementation, the lower mold base is fixed with guide rods B extending radially along the circular frame on the side facing the axis of the circular frame, and the vertical part of the Z-shaped retainer is correspondingly slidably fitted onto the guide rods B; A spring B is sleeved on the outside of the guide rod B. One end of the spring B is fixed to the side wall of the lower mold base, and the other end is fixed to the side surface of the Z-shaped retainer facing the lower mold base. The outer wall of the lower mold base is provided with an insert groove that communicates with the molding cavity; The upper horizontal part of the Z-shaped retainer serves as the retaining part, which is slidably installed in the mounting slot. The lower horizontal part of the Z-shaped retainer has an inclined surface A. The end of the lower pressure arm has a bevel B, which is pressed together with the bevel A.

[0011] In one implementation, a vertically downward extending guide column is fixed at the bottom of the circular platform, and a lifting seat is slidably fitted on the guide column. A telescopic cylinder is vertically fixed at the bottom of the hollow base frame, and the telescopic end of the telescopic cylinder is fixedly connected to the lifting seat; The bottom end of the shaft extends through to the bottom of the circular frame and is rotatably mounted on the lifting seat via a bearing. A drive motor is fixed on the lifting platform, and the output shaft of the drive motor is fixedly connected to the bottom end of the shaft through a coupling.

[0012] In one implementation, the clamping mechanism includes a T-shaped frame, a bidirectional screw, a pair of nut seats, and a pair of clamping plates; A fixing disc is fixedly mounted on the shaft; The T-shaped frame is hollow, and its ends are fixed to the upper surface of the fixed plate; The bidirectional screw is rotatably mounted inside the cavity of the T-shaped frame; Two nut seats are symmetrically and slidingly installed in the cavity of the T-shaped frame, and are respectively threaded and fitted on both sides of the bidirectional screw. The two clamps are fixed to the ends of the two nut seats in a corresponding manner; The shaft is also equipped with a drive mechanism to drive each bidirectional screw to rotate synchronously.

[0013] In one implementation, the drive mechanism includes a drive motor, a main gear, a driven gear ring, and a bevel gear ring; A support is fixed to the top of the shaft, and the drive motor is fixed to the support; The main gear is fixed on the output shaft of the drive motor, and the driven gear ring is rotatably mounted on the shaft and meshes with the main gear. The bevel gear ring is rotatably mounted on the shaft, and the bevel gear ring and the driven gear ring are coaxially and fixedly connected. Each T-shaped frame has a rotating shaft that extends radially along the shaft. Each rotating shaft has a bevel gear A fixed at one end facing the shaft rod, and each bevel gear A meshes with a bevel gear ring. Each rotating shaft has a bevel gear B fixed at the end furthest from the shaft, and a bevel gear C is fixedly fitted in the middle of each bidirectional screw. The bevel gear C meshes with the bevel gear B in a one-to-one correspondence.

[0014] In one implementation, the pressing mechanism also includes a top frame, a lifting platform, and a power hydraulic cylinder; The top of the circular platform is evenly distributed with vertical rods, and the lifting platform is slidably fitted onto the vertical rods; A top frame is fixed to the top of each vertical rod, and a power hydraulic cylinder is vertically fixed to the top frame; The telescopic end of the power hydraulic cylinder extends through to the bottom of the top frame and is fixedly connected to the lifting platform. The lower surface of the lifting platform is fixed with connecting arms extending downwards at the corresponding positions of each molding cavity, and the upper mold body is fixed to the bottom end of the connecting arms one by one.

[0015] In one implementation, each molding cavity has an oil injection hole on one side of its slope, and each oil injection hole is equipped with a one-way valve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: During the stretching process, the sloping surface of the top opening of the molding cavity, the outer wall of the upper mold, and the surface of the intermediate shell product respectively form oil-retaining gaps A and B. Both oil-retaining gaps are semi-enclosed spaces. After the lubricating oil is directly injected into oil-retaining gap A through the oil injection hole, the upper part of the gap is limited by the outer wall of the upper mold and the sloping surface, while the lower part is closed by the top surface of the intermediate shell product. Therefore, the oil is forcibly confined within the gap area and cannot splash outward, but can only be applied along the outer wall surface of the upper mold. After the upper mold moves upward, the lubricating oil remains on the sloping surface. As the intermediate shell product moves upward, oil-retaining gap B is formed by the outer wall of the intermediate shell product and the sloping surface. The oil on the sloping surface is again confined within the gap and can only be applied along the outer wall of the intermediate shell product.

[0017] By physically constraining the oil flow channel through the oil-retaining gap, the oil flows and wets only in the gap area that contacts the mold and the workpiece. This eliminates the path for oil to splash and spread to the outside of the mold cavity, suppressing oil pollution to the equipment and the environment. At the same time, the oil is confined to the contact area that requires lubrication, avoiding oil waste caused by ineffective splashing and improving oil utilization. Furthermore, the oil makes full contact with the workpiece and mold surface within the semi-enclosed gap, ensuring that the outer wall of the upper mold, the inner and outer walls of the intermediate shell product, and the inner wall of the molding cavity are all uniformly wetted.

[0018] The workpiece is transferred in a ring array multi-station manner by driving the clamping mechanism through the shaft. The forming cavities are arranged along the circumference of the equipment, which effectively shortens the space occupied in the straight direction. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a partial structure above the platform in this invention; Figure 3 This is a schematic diagram of a partial structure at the bottom of the platform in this invention; Figure 4 This is a schematic diagram of a partial internal structure of the molding cavity in this invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of a partial structure on the shaft in this invention; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B; Figure 8 This is a schematic diagram of the clamping mechanism in the present invention; Figure 9 This is a schematic diagram of the pressing mechanism in this invention; Figure 10 This is a schematic diagram showing the structural formation of the oil storage gap A; Figure 11 This is a schematic diagram of the structure when the upper mold body is completely detached from the molding cavity; Figure 12 This is a schematic diagram of the structure of the oil storage gap B.

[0020] In the diagram: 01. Intermediate shell product; 02. Oil storage gap A; 03. Oil storage gap B; 1. Hollowed-out base frame; 11. Circular support platform; 111. Guide pillar; 12. Lower mold base; 13. Molding cavity; 14. Sloping surface; 15. Oil injection hole; 2. Shaft; 201. Fixed plate; 21. Lifting seat; 22. Drive motor; 23. Telescopic cylinder; 3. Clamping mechanism; 31. T-shaped frame; 32. Bidirectional screw; 33. Nut seat; 34. Clamping plate; 4. Drive motor; 401. Support; 41. Main gear; 4 2. Driven gear ring; 43. Bevel gear ring; 44. Rotating shaft; 45. Bevel gear A; 46. Bevel gear B; 47. Bevel gear C; 5. Pressing mechanism; 501. Vertical rod; 51. Upper mold body; 52. Top frame; 53. Lifting platform; 54. Power hydraulic cylinder; 55. Connecting arm; 6. Push seat; 61. Guide rod A; 62. Spring A; 7. Z-shaped retaining element; 701. Guide rod B; 702. Insertion slot; 71. Retaining part; 72. Inclined surface A; 73. Spring B; 8. Pressing arm; 81. Inclined surface B. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that in the description of the embodiments of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "radial," and "axial," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. In the drawings, "radial" refers to the diameter or radius direction of the circular platform 11, and "axial" refers to the direction of the central axis of the circular platform 11. These terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Please see Figures 1 to 9 This application provides a stretching device for aluminum shells of new energy vehicle batteries. The stretching device includes a hollow base frame 1, a circular frame 11, a forming cavity 13, a ramp surface 14, a pressing mechanism 5, an upper mold body 51, a shaft 2, and a clamping mechanism 3.

[0024] Specifically, the top of the hollow base frame 1 has a circular platform 11, and several forming cavities 13 are arranged in a ring around its central axis on the circular platform 11. The four sides of the top opening of each forming cavity 13 are formed into a sloping surface 14, that is, the entire top opening edge of the forming cavity 13 is designed as an outwardly inclined sloping structure.

[0025] A pressing mechanism 5 is provided above the circular support platform 11. The pressing mechanism 5 includes several upper mold bodies 51 arranged in a ring array. The number and position of the upper mold bodies 51 correspond one-to-one with the forming cavities 13 on the lower circular support platform 11. A shaft 2 is coaxially arranged on the circular support platform 11. The shaft 2 can be driven to rotate around its own axis and can also move up and down along its own axis. Several clamping mechanisms 3 are evenly arranged on the shaft 2 and spaced around its axis. The clamping mechanisms 3 are used to clamp and transfer the intermediate shell product 01, which serves as the workpiece.

[0026] During the workpiece stretching and lubrication process, when the pressing mechanism 5 drives the upper mold body 51 to descend to the limit position, such as Figure 10 As shown, the outer wall of the intermediate shell product 01 is tightly attached to the inner wall of the molding cavity 13, and the outer wall of the upper mold body 51 is tightly attached to the inner wall of the intermediate shell product 01. The inner slope of the ramp surface 14, the inner wall of the molding cavity 13, the top surface of the intermediate shell product 01, and the outer wall of the upper mold body 51 together form an annular and semi-closed gap space, which is defined as the oil storage gap A02. When the intermediate shell product 01 is pushed upwards alone, as... Figure 12 As shown, the outer wall of the intermediate shell product 01 is tightly attached to the inner wall of the molding cavity 13. A semi-closed gap space is formed between the outer wall of the intermediate shell product 01 and the inner side wall of the slope surface 14. This gap space is defined as the oil storage gap B03.

[0027] According to this embodiment, the stretching device constructs oil-retaining gaps A02 and B03 by setting a ramp surface 14 at the top opening of the forming cavity 13, which works in conjunction with the upper mold body 51 and the intermediate shell product 01 under specific motion states. These two gaps serve as physical constraint channels for the flow of lubricating oil, forcibly confining the lubricating oil to the contact surface area between the mold and the workpiece that requires lubrication. This eliminates the unconstrained splashing path of oil in traditional spray lubrication, thereby solving the problems of oil spillage, equipment contamination, and serious waste. At the same time, it ensures that the oil fully and uniformly wets the inner wall of the forming cavity 13, the inner and outer walls of the intermediate shell product 01, and the outer wall of the upper mold body 51.

[0028] Furthermore, in practical applications, the equipment drives the clamping mechanism 3 to perform circular transfer of the workpiece to be processed between the forming cavities 13 of each station through the rotation and lifting of the shaft 2. After the workpiece completes one stretching in a certain forming cavity 13, it will be transferred to the next forming cavity 13 with a gradually changing size for the next stretching, thus forming a circular production line.

[0029] In one embodiment, such as Figure 2 , Figure 3 and Figure 4 As shown, a further exemplary description is provided regarding the support, elastic cushioning, and demolding structure of the workpiece in the forming cavity 13.

[0030] The bottom of the circular frame 11 has several lower mold bases 12 arranged in a ring around its axis. Each lower mold base 12 and the hollow base frame 1 are formed together with the aforementioned forming cavity 13. A pusher seat 6 is slidably installed inside each forming cavity 13. At least one through hole is opened at the bottom of each lower mold base 12, and a guide rod A61 is vertically inserted and slidably installed in each through hole.

[0031] The top end of the guide rod A61 is fixedly connected to the bottom of the corresponding push seat 6 by means of thread or welding; a spring A62 is sleeved on the outside of each guide rod A61, the top end of the spring A62 is fixed to the bottom of the push seat 6, and the bottom end is fixed to the inner bottom wall of the forming cavity 13.

[0032] In addition, a stop block (not shown in the figure) is fixed on the inner side wall of each molding cavity 13 and near its inner bottom wall. This stop block is used to limit the downward limit position of the pusher 6 to assist in the bottom molding of the intermediate shell product 01.

[0033] As the upper mold body 51 moves downward and presses the workpiece into the molding cavity 13, the workpiece and the pusher seat 6 are subjected to force and move downward synchronously. The guide rod A61 slides downward along the through hole. At this time, the spring A62 is compressed and accumulates elastic potential energy. When the stretching process is completed and the upper mold body 51 moves upward and leaves, the pressure applied to the pusher seat 6 disappears. Using the elastic force accumulated by the spring A62, the pusher seat 6 can be pushed upward to reset, thereby pushing the formed intermediate shell product 01 upward and realizing the automatic demolding of the intermediate shell product 01 from the molding cavity 13.

[0034] This elastic reset structure automates the demolding process. It is simple in structure and reliable in operation, eliminating the need for an additional independent ejection drive source, thus reducing equipment complexity and cost.

[0035] Furthermore, in this embodiment, when the pusher seat 6 returns to its limit state under the elastic force of the spring A62, the height of its top surface is limited to be lower than the lowest point of the ramp surface 14. The advantage of this design is that it ensures that the pusher seat 6 will not detach from the molding cavity 13 when fully reset, thereby preventing any lubricating oil that may adhere to it from splashing or leaking outside the molding cavity 13 due to impact during rapid reset, further suppressing oil contamination.

[0036] In one embodiment, such as Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, an exemplary description is provided of the mechanism for reliably separating the intermediate shell product 01 from the upper mold body 51 and for subsequent lifting and transfer.

[0037] Each lower die base 12 is provided with a Z-shaped retaining member 7 on one side facing the central axis of the circular frame 11. Correspondingly, a lower pressure arm 8 is fixedly installed on the shaft 2 at the position corresponding to each Z-shaped retaining member 7 for pressing and engaging with the Z-shaped retaining member 7.

[0038] To facilitate the description of the entire action process, the state when the shaft 2 moves upward to its limit position is defined as the first state, the state when the shaft 2 moves downward to its limit position is defined as the second state, and the state at the moment when the squeezing action of the pressure arm 8 and the Z-shaped clamping member 7 completely disappears is defined as the third state.

[0039] In the second state, such as Figure 11 As shown, the lower pressure arm 8 pushes the corresponding Z-shaped retainer 7 to feed towards the molding cavity 13 along the radial direction of the circular frame 11. The end of the Z-shaped retainer 7 can form an abutment fit with the top end face of the intermediate shell product 01, thereby preventing the intermediate shell product 01 from moving upward synchronously with the upper mold body 51.

[0040] In the third state, such as Figure 12 As shown, the Z-shaped retainer 7 automatically resets to remove its obstruction of the intermediate housing product 01; in addition, the difference between the height of the clamping mechanism 3 in the third state and its height in the first state is designed to be greater than the height difference between the top surface of the push base 6 and the upper surface of the circular frame 11.

[0041] The specific working process of the mechanism is as follows: the shaft 2 is initially in the highest first state, and then drives the lower pressure arm 8 to move down to the second state. The lower pressure arm 8 pushes the Z-shaped clamping piece 7 to move and block the top of the intermediate shell product 01, thereby preventing the intermediate shell product 01 from moving up due to oil adhesion or vacuum when the upper mold body 51 moves up, thus realizing the forced separation of the intermediate shell product 01 from the upper mold body 51.

[0042] Subsequently, shaft 2 begins to move upward to the third state, and the squeezing of the lower pressure arm 8 and the Z-shaped retainer 7 gradually weakens until it disappears. The Z-shaped retainer 7 automatically resets, removing the obstruction to the intermediate shell product 01. At this time, the intermediate shell product 01 moves upward from the molding cavity 13 under the pushing action of the pusher seat 6, realizing the separation of the intermediate shell product 01 from the molding cavity 13.

[0043] When the pusher seat 6 moves to its limit position, its top surface is lower than the upper surface of the circular frame 11, causing the bottom surface of the demolded intermediate shell product 01 to be lower than the upper surface of the circular frame 11. If it is directly rotated horizontally for transfer, the bottom of the intermediate shell product 01 will cause structural interference with the opening of the molding cavity 13 or the circular frame 11. At this time, the clamping mechanism 3 first clamps the intermediate shell product 01, and then the shaft 2 continues to move upward from the third state to return the equipment to the first state. During this process, the intermediate shell product 01 is raised from the lower demolding position to a predetermined safe height, ensuring that the bottom height of the intermediate shell product 01 is higher than the upper surface of the circular frame 11, thereby ensuring that the intermediate shell product 01 can be smoothly transferred horizontally from above the previous molding cavity 13 to above the next molding cavity 13 to be processed.

[0044] The above actions, through the coordinated operation of the lifting and lowering of shaft 2 and clamping mechanism 3, complete the separation, demolding, lifting and transfer preparation of the product, with a compact and ingenious structural design.

[0045] As one specific implementation of this embodiment, such as Figure 3 and Figure 5As shown, guide rods B701 extending radially along the circular frame 11 are fixedly connected to one side of the lower mold base 12 facing the axis of the circular frame 11. The vertical part of the Z-shaped retaining member 7 is correspondingly slidably fitted onto the guide rods B701. A spring B73 is sleeved on the outside of the guide rods B701. One end of the spring B73 is fixed to the side wall of the lower mold base 12, and the other end is fixed to the side surface of the Z-shaped retaining member 7 facing the lower mold base 12.

[0046] The outer wall of the lower mold base 12 is provided with an insert groove 702 that communicates with the interior of the molding cavity 13. The upper horizontal part of the Z-shaped retainer 7 serves as a retaining part 71, which is slidably installed in the insert groove 702. The lower horizontal part of the Z-shaped retainer 7 has an inclined surface A72. Correspondingly, the end of the lower pressure arm 8 has an inclined surface B81 that matches the inclined surface A72. The inclined surface B81 and the inclined surface A72 form a corresponding inclined surface extrusion fit.

[0047] When the shaft 2 moves from the first state to the second state, the lower pressure arm 8 engages with the inclined surface A72 on the Z-shaped clamping member 7 through the inclined surface B81 on it, which converts the vertical downward movement of the shaft 2 into the horizontal movement of the Z-shaped clamping member 7 along the radial feed of the circular frame 11, thereby pushing the clamping part 71 into the molding cavity 13; during this process, the spring B73 is compressed and stores force.

[0048] When the upper mold body 51 completes stretching and begins to move upward, the end face of the extended retaining part 71 can slide and fit against the outer wall of the upper mold body 51, and its upper surface forms a blocking fit with the top surface of the intermediate shell product 01, thereby reliably preventing the intermediate shell product 01 from moving upward synchronously with the upper mold body 51. When the shaft 2 moves upward from the second state to the third state, the compression of the inclined surface B81 and the inclined surface A72 is completely separated, the compressed spring B73 releases its elastic force, and pushes the Z-shaped retaining part 7 to slide back along the guide rod B701, so that the retaining part 71 is completely retracted into the insert slot 702, completely eliminating the blocking restriction on the intermediate shell product 01, which facilitates the next step of the pusher seat 6 to push the intermediate shell product 01 upward for demolding.

[0049] The vertical motion is converted into horizontal feed by using a sloped extrusion method. The structure is simple, the action is transmitted directly, and it has self-locking properties, which ensures the stability of the block.

[0050] In one embodiment, such as Figure 3 As shown, the mechanism by which the drive shaft 2 achieves rotation and lifting is described in detail.

[0051] At least one vertically downward-extending guide post 111 is fixedly connected to the bottom of the circular frame 11, and a lifting seat 21 is slidably fitted on the guide post 111. A telescopic cylinder 23 is vertically fixedly installed at the inner bottom of the hollow base frame 1. The telescopic cylinder 23 can be a hydraulic cylinder or a pneumatic cylinder, with its telescopic end facing upward and fixedly connected to the lifting seat 21. The bottom end of the shaft 2 passes through the circular frame 11 and extends to the bottom of the circular frame 11, and is rotatably mounted on the lifting seat 21 by bearings; a drive motor 22 is also fixedly installed on the lifting seat 21, and the output shaft of the drive motor 22 is fixedly connected to the bottom end of the shaft 2 by a coupling.

[0052] When the telescopic cylinder 23 extends or retracts, it drives the lifting seat 21 to rise and fall vertically along the guide column 111, thereby causing the shaft 2 to move axially. When the drive motor 22 rotates, it can directly drive the shaft 2 to rotate around its own axis. This design, which integrates both the rotation and lifting drive sources on the lifting seat 21, makes the motion control of the shaft 2 more independent and centralized, simplifying the transmission chain.

[0053] In one embodiment, such as Figure 6 , Figure 7 and Figure 8 As shown, the specific structure of the clamping mechanism 3 and its driving mechanism are described in detail.

[0054] The clamping mechanism 3 includes a T-shaped frame 31, a bidirectional screw 32, a pair of nut seats 33, and a pair of clamping plates 34. A fixed plate 201 is fixedly mounted on the shaft 2. The T-shaped frame 31 is a hollow shell structure, and its end is fixedly connected to the upper surface of the fixed plate 201. The bidirectional screw 32 is rotatably mounted inside the cavity of the T-shaped frame 31 through bearings. The two nut seats 33 are symmetrically limited and slidably mounted inside the cavity of the T-shaped frame 31, and are respectively threadedly matched onto the two opposite threads on the bidirectional screw 32. The two clamping plates 34 are fixed to the ends of the two nut seats 33 one to one.

[0055] In addition, a drive mechanism is provided on the shaft 2 to drive all the bidirectional screws 32 to rotate synchronously. When the drive mechanism drives the bidirectional screws 32 to rotate, it will cause the two nut seats 33 on them to move closer or further apart along the axial direction under the cavity limit of the T-shaped frame 31, thereby causing the two clamping plates 34 to clamp or loosen.

[0056] Specifically, when the two clamping plates 34 move closer to each other, they can firmly hold the intermediate shell product 01 located between them. When it is necessary to transfer the workpiece, the shaft 2 rotates by a preset angle corresponding to one station, so that the clamped intermediate shell product 01 is accurately transferred from the position aligned with the previous forming cavity 13 to the position aligned with the next forming cavity 13, thereby realizing the precise transfer of the workpiece between multi-stage stretching processes.

[0057] In a more specific embodiment of the aforementioned drive mechanism, such as Figure 7 and Figure 8 As shown, the drive mechanism includes a drive motor 4, a main gear 41, a driven gear ring 42, and a bevel gear ring 43.

[0058] A support 401 is fixed to the top of the shaft 2, and the drive motor 4 is fixedly mounted on the support 401. The main gear 41 is fixed to the output shaft of the drive motor 4, and the driven gear ring 42 is rotatably mounted on the shaft 2 through a bearing and meshes with the main gear 41. The bevel gear ring 43 is also rotatably mounted on the shaft 2 through a bearing and is coaxially fixedly connected to the driven gear ring 42 to form a whole.

[0059] Inside each T-shaped frame 31, a rotating shaft 44 extending radially along the shaft 2 is rotatably mounted via bearings. A bevel gear A45 is fixed at one end of each rotating shaft 44 facing the axis of the shaft 2, and these bevel gears A45 are engaged with the bevel gear ring 43. A bevel gear B46 is fixed at the end of each rotating shaft 44 away from the shaft 2. A bevel gear C47 is fixedly fitted at the middle position of each bidirectional screw 32, and the bevel gear C47 meshes with the corresponding bevel gear B46 in a one-to-one correspondence.

[0060] When the drive motor 4 starts, the main gear 41 on its output shaft meshes and drives the driven gear ring 42 and the bevel gear ring 43 fixedly connected to it to rotate. The rotation of the bevel gear ring 43 will synchronously drive all the bevel gears A45 that mesh with it to rotate, which in turn drives the rotating shaft 44 and the bevel gear B46 to rotate synchronously. The rotating bevel gear B46 meshes and drives the bevel gear C47 and the bidirectional screw 32 to rotate, which can eventually drive all the bidirectional screws 32 to rotate synchronously, so as to realize the synchronous clamping or loosening of the clamping plates 34 of all clamping mechanisms 3.

[0061] A drive motor 4 is used in conjunction with a gear and bevel gear transmission system to synchronously control the movements of all clamping mechanisms 3, ensuring high consistency and synchronicity of clamping actions at each station, as well as high transmission accuracy and compact structure.

[0062] In one embodiment, such as Figure 1 and Figure 9 As shown, the specific structure of the pressing mechanism 5 is explained in detail. The pressing mechanism 5 also includes a top frame 52, a lifting platform 53, and a power hydraulic cylinder 54.

[0063] The top of the circular platform 11 has multiple vertical rods 501 evenly distributed and fixed, and the lifting platform 53 is slidably mounted on the vertical rods 501. A top frame 52 is fixedly installed on the top of the vertical rods 501. A power hydraulic cylinder 54 is vertically fixedly installed on the top frame 52, and its telescopic end extends downward through to the bottom of the top frame 52 and is fixedly connected to the lifting platform 53.

[0064] On the lower surface of the lifting platform 53, at positions corresponding to the molding cavities 13 below, there are downwardly extending connecting arms 55, and the aforementioned upper mold body 51 is fixedly installed on the bottom end of the connecting arms 55 in a corresponding manner.

[0065] When the hydraulic cylinder 54 extends and drives the lifting platform 53 to move downward along the vertical rod 501, it can drive all the upper mold bodies 51 to move downward synchronously through the connecting arm 55, so as to simultaneously punch and stretch the workpieces at each station. When the hydraulic cylinder 54 retracts and drives the lifting platform 53 to move upward, it can drive the upper mold bodies 51 to move upward synchronously to reset.

[0066] In one embodiment, such as Figure 4 As shown, to achieve precise control of the lubricating oil supply, an oil injection hole 15 is provided on one side of the slope surface 14 of each molding cavity 13. This oil injection hole 15 is connected to an external oil supply device (e.g., a metering pump and an oil tank) through a pipe to achieve timed and metered supply of lubricating oil. Each oil injection hole 15 is equipped with a one-way valve, which only allows lubricating oil to flow from the external oil supply device into the molding cavity 13, preventing backflow of oil from the molding cavity 13 and thus preventing contamination of the oil supply pipeline.

[0067] In one embodiment, such as Figure 2 , Figure 4 , Figure 10 , Figure 11 and Figure 12 As shown, the working principle of how the entire device achieves multi-stage stretching and self-constrained impregnation lubrication is comprehensively explained. The shapes of each forming cavity 13 are different, and their internal dimensions and shapes gradually change according to the sequence of the stretching process. Similarly, the shape of each upper mold body 51 is adapted to the internal shape of its corresponding forming cavity 13, thereby enabling the workpiece to be gradually stretched and deformed from a shallower, larger shape into the desired final size and shape of the battery aluminum shell.

[0068] In a complete single-station stretching and lubrication cycle, the process is as follows: First, the upper mold 51 presses the workpiece to be stretched into the forming cavity 13. When the upper mold 51 descends to its limit position, the workpiece is stretched and formed into an intermediate shell product 01. The top height of the intermediate shell product 01 is lower than the height of the holding part 71 of the Z-shaped holding member 7. At this time, an oil storage gap A02 is formed between the ramp surface 14, the inner wall of the forming cavity 13, the top surface of the intermediate shell product 01, and the outer wall of the upper mold 51. Then, the external oil supply device injects a certain amount of lubricating oil into the oil storage gap A02 through the oil injection hole 15. Subsequently, the shaft 2 moves from the first state to the second state, driving the pressing arm 8 to push the holding part 71 radially forward, blocking the top of the intermediate shell product 01.

[0069] Next, the upper mold body 51 begins to move upward. In the oil storage gap A02, the lubricating oil is confined in the semi-enclosed space. As the upper mold body 51 moves upward, the oil is forced to flow along the outer wall of the upper mold body 51 and wet and coat it, thus completing the fixed-point and quantitative oiling of the outer wall of the upper mold body 51.

[0070] After the upper mold body 51 is completely restored to its original position, some of the residual lubricating oil that was originally accumulated in the oil storage gap A02 and on the inner wall of the slope surface 14 will flow downward and soak into the inner wall of the intermediate shell product 01 under the action of gravity. Then, the shaft 2 moves upward to the third state, the Z-shaped retainer 7 is reset, and the obstruction to the intermediate shell product 01 is removed. The intermediate shell product 01 begins to move upward synchronously under the pushing action of the pusher seat 6. During this upward movement, an oil storage gap B03 is formed between the outer wall of the intermediate shell product 01 and the inner wall of the slope surface 14. The oil that was previously left on the slope surface 14 accumulates here and is constrained in the oil storage gap B03. As the intermediate shell product 01 moves upward, the outer wall of the intermediate shell product 01 is wetted with oil.

[0071] As the intermediate shell product 01 is pushed completely out of the molding cavity 13, the remaining oil on the inner wall of the ramp surface 14 will flow naturally down the inner wall of the molding cavity 13 through the gap between the outer wall of the pusher seat 6 and the inner wall of the molding cavity 13, thus coating the inner wall with oil. Through the above complete cycle, by utilizing the physical constraints of the oil flow channel by the oil storage gaps A02 and B03, the precise wetting and lubrication treatment of the outer wall of the upper mold body 51, the inner wall of the intermediate shell product 01, the outer wall of the intermediate shell product 01, and the inner wall of the molding cavity 13 is completed in sequence, thus achieving comprehensive lubrication of the working surfaces.

[0072] After the lubrication of the outer wall of the intermediate shell product 01 is completed, the clamping mechanism 3 clamps the intermediate shell product 01, the shaft 2 moves upward to provide a lifting action, and then rotates by one station angle to put it into the molding cavity 13 of the next process for stretching and lubrication again, and so on.

[0073] It is worth noting that when the blank is formed into the first intermediate shell product 01, the blank undergoes minimal stretching deformation, requiring no oiling or simple lubrication. Furthermore, a loading robotic arm is positioned beside the hollow base frame 1, corresponding to the first stretching station, to load the blank above the forming cavity 13 at the first stretching station. A unloading robotic arm is positioned beside the hollow base frame 1, corresponding to the last stretching station, to remove the formed product.

[0074] The control method of the present invention is automatic control through a controller. The control program of the controller can be implemented by those skilled in the art through simple programming. The power supply and circuit connection are common knowledge in the art, so the control method and circuit connection will not be explained in detail in the present invention.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stretching device for aluminum shells of new energy vehicle batteries, comprising a hollow base frame (1) with a circular platform (11) on top, characterized in that: The circular frame (11) has several forming cavities (13) arranged around its axis, and the four sides of the top opening of each forming cavity (13) are formed into sloping surfaces (14). The circular frame (11) is provided with a pressing mechanism (5). The pressing mechanism (5) includes several upper mold bodies (51) arranged in a ring array. The number and position of the upper mold bodies (51) correspond one-to-one with the forming cavity (13). The circular frame (11) is coaxially provided with a shaft (2), which can rotate around its own axis and rise and fall along its own axis. The shaft (2) is evenly distributed with several clamping mechanisms (3) spaced around its axis for clamping and transferring workpieces; When the upper mold (51) descends to the limit position, an oil-storing gap A (02) is formed between the slope surface (14), the inner wall of the molding cavity (13), the top surface of the intermediate shell product (01), and the outer wall of the upper mold (51). When the intermediate shell product (01) moves upward alone, an oil-storing gap B (03) is formed between its outer wall and the slope surface (14).

2. The battery aluminum shell stretching equipment according to claim 1, characterized in that: The bottom of the circular frame (11) has a number of lower mold bases (12) arranged in a ring around its axis, and each of the lower mold bases (12) and the hollow base frame (1) together form the forming cavity (13). Each of the molding cavities (13) is slidably installed with a pusher seat (6); Each of the lower mold bases (12) has a through hole at its bottom, and a guide rod A (61) is vertically and slidably installed in each through hole. The top end of the guide rod A (61) is fixed to the bottom of the corresponding push seat (6); Each guide rod A (61) is fitted with a spring A (62). The top end of the spring A (62) is fixed to the bottom of the push seat (6), and the bottom end is fixed to the bottom wall of the forming cavity (13).

3. The battery aluminum shell stretching equipment according to claim 2, characterized in that: When the pusher seat (6) moves upward and resets to its limit state, the height of its top surface is lower than the height of the slope surface (14).

4. The battery aluminum shell stretching equipment according to claim 2, characterized in that: Each of the lower mold bases (12) is provided with a Z-shaped retaining member (7) on one side facing the axis of the circular frame (11), and a lower pressing arm (8) that is pressed and engaged with the Z-shaped retaining member (7) is fixed on the shaft (2) at the position corresponding to the Z-shaped retaining member (7). The first state is defined as when the shaft (2) moves upward to the limit position, the second state is defined as when the shaft (2) moves downward to the limit position, and the third state is defined as when the compression between the lower pressure arm (8) and the Z-shaped clamp (7) completely disappears. In the second state, the lower pressure arm (8) pushes the corresponding Z-shaped clamping member (7) to feed radially along the circular frame (11). The circular frame (11) can abut against the top end face of the intermediate shell product (01) to prevent the intermediate shell product (01) from moving upward synchronously with the upper mold body (51). In the third state, the Z-shaped retainer (7) automatically resets to remove its obstruction of the intermediate housing product (01); When the pusher seat (6) moves to its limit position, the difference between the height of the clamping mechanism (3) in the third state and its height in the first state is greater than the height difference between the top surface of the pusher seat (6) and the upper surface of the circular frame (11).

5. The battery aluminum shell stretching equipment according to claim 4, characterized in that: The lower mold base (12) is fixed with guide rods B (701) extending radially along the circular frame (11) on the side facing the axis of the circular frame (11), and the vertical part of the Z-shaped clamping member (7) is correspondingly slidably fitted onto the guide rods B (701); The guide rod B (701) is fitted with a spring B (73). One end of the spring B (73) is fixed to the side wall of the lower mold base (12), and the other end is fixed to the side surface of the Z-shaped retainer (7) facing the lower mold base (12). The lower mold base (12) has an insert groove (702) on its outer wall that communicates with the molding cavity (13). The upper horizontal part of the Z-shaped retainer (7) serves as a retainer (71), which is slidably installed in the mounting slot (702), and the lower horizontal part of the Z-shaped retainer (7) has an inclined surface A (72). The end of the lower pressure arm (8) has a slope B (81), which is in a pressing fit with the slope A (72).

6. The battery aluminum shell stretching equipment according to claim 1, characterized in that: The bottom of the circular platform (11) is fixed with a vertically downward extending guide column (111), and a lifting seat (21) is slidably fitted on the guide column (111). A telescopic cylinder (23) is vertically fixed at the bottom of the hollow base frame (1), and the telescopic end of the telescopic cylinder (23) is fixedly connected to the lifting seat (21); The bottom end of the shaft (2) extends through to the bottom of the circular frame (11) and is rotatably mounted on the lifting seat (21) via a bearing; A drive motor (22) is fixed on the lifting seat (21), and the output shaft of the drive motor (22) is fixedly connected to the bottom end of the shaft (2) through a coupling.

7. The battery aluminum shell stretching equipment according to claim 1, characterized in that: The clamping mechanism (3) includes a T-shaped frame (31), a bidirectional screw (32), a pair of nut seats (33) and a pair of clamping plates (34); A fixed plate (201) is fixedly fitted on the shaft (2); The T-shaped frame (31) is a hollow body, and its end is fixed to the upper surface of the fixed plate (201); The bidirectional screw (32) is rotatably mounted in the cavity of the T-shaped frame (31); The two nut seats (33) are symmetrically and slidably installed in the cavity of the T-shaped frame (31), and are respectively threadedly fitted on both sides of the bidirectional screw (32); The two clamps (34) are fixed to the ends of the two nut seats (33) in a one-to-one correspondence; The shaft (2) is also equipped with a drive mechanism for driving each bidirectional screw (32) to rotate synchronously.

8. The battery aluminum shell stretching equipment according to claim 7, characterized in that: The drive mechanism includes a drive motor (4), a main gear (41), a driven gear ring (42), and a bevel gear ring (43). The top end of the shaft (2) is fixed with a support (401), and the drive motor (4) is fixed on the support (401); The main gear (41) is fixed on the output shaft of the drive motor (4), and the driven gear ring (42) is rotatably mounted on the shaft (2) and meshes with the main gear (41); The bevel gear ring (43) is rotatably mounted on the shaft (2), and the bevel gear ring (43) and the driven gear ring (42) are coaxially and fixedly connected. Each of the T-shaped frames (31) is rotatably mounted with a rotating shaft (44) extending radially along the shaft (2); Each of the rotating shafts (44) has a bevel gear A (45) fixed at one end facing the shaft (2), and each of the bevel gears A (45) meshes with the bevel gear ring (43); Each of the rotating shafts (44) has a bevel gear B (46) fixed at one end away from the shaft (2), and each of the bidirectional screws (32) has a bevel gear C (47) fixedly fitted at the middle, with the bevel gear C (47) meshing with the bevel gear B (46) in a one-to-one correspondence.

9. The battery aluminum shell stretching equipment according to claim 1, characterized in that: The pressing mechanism (5) also includes a top frame (52), a lifting platform (53), and a power hydraulic cylinder (54); The top of the circular frame (11) is evenly distributed with vertical rods (501), and the lifting platform (53) is slidably fitted onto the vertical rods (501); The top of the vertical rod (501) is fixed to the top frame (52), and the power hydraulic cylinder (54) is vertically fixed to the top frame (52); The telescopic end of the power hydraulic cylinder (54) extends through to the bottom of the top frame (52) and is fixedly connected to the lifting platform (53); The lower surface of the lifting platform (53) is fixed with a downwardly extending connecting arm (55) at the corresponding position of each molding cavity (13), and the upper mold body (51) is fixed to the bottom end of the connecting arm (55) in a corresponding manner.

10. The battery aluminum shell stretching equipment according to claim 1, characterized in that: Each of the molding cavities (13) has an oil injection hole (15) on one side of the slope surface (14), and each oil injection hole (15) is equipped with a one-way valve.

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