A closed-loop automated production line for flat baking trays

Abstract

This invention relates to an automated production line for a closed flat baking pan. The invention includes a corner-punching mechanism, comprising a lower corner-punching die and an upper corner-punching die that can move up and down relative to the lower corner-punching die. The upper and lower corner-punching dies work together to punch a rectangular blank into a first semi-finished product with four arc-shaped corners. A flanging mechanism, comprising a lower flanging die and an upper flanging die that can move up and down relative to the lower flanging die, works together to fold the circumferential edge of the first semi-finished product, forming a second semi-finished product. A pre-forming mechanism is used to bend the folded edges of the second semi-finished product inwards to form folded edges, forming a third semi-finished product. A flattening mechanism, comprising a lower flattening die and an upper flattening die that can move up and down relative to the lower flattening die, works together to flatten the circumferential folded edges of the third semi-finished product, obtaining a shaped baking pan. This invention eliminates the need for welding and polishing in the production of closed flat baking pans, thus improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of baking pan manufacturing technology, and in particular to an automated production line for a closed flat baking pan. Background Technology

[0002] The main production process of existing closed flat baking trays includes: punching the four corners of the body (Figure 1), and pre-forming by bending the four sides of the body (Figure 1). Figure 1a ), body stamping ( Figures 1b-1c Iron square bars need to be inserted to assist in shaping, and then the iron square bars are removed after shaping. (Four corners are cut off.) Figure 1d ), four-corner forming ( Figure 1e ), body and four corners combined welding and polishing ( Figure 1f Although this process requires less investment in molds, it has the following problems: low production efficiency, high equipment and labor costs; long turnaround time and large turnaround space; friction from inserting and removing iron bars can easily damage the baking pan; welding is prone to rust and is not environmentally friendly; product strength, flatness is poor and it is easy to deform. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides an automated production line for a closed flat baking pan, which improves production efficiency and eliminates the need for welding and polishing of the produced closed flat baking pans, resulting in a significant improvement in overall flatness and strength.

[0004] Therefore, the present invention provides an automated production line for a closed flat baking pan, comprising:

[0005] The corner punching mechanism includes a lower corner punching die and an upper corner punching die that can move up and down relative to the lower corner punching die. The upper corner punching die and the lower corner punching die work together to punch a rectangular blank into a first semi-finished product with four arc corners.

[0006] The flanging mechanism includes a lower flanging die and an upper flanging die that can move up and down relative to the lower flanging die. The upper flanging die and the lower flanging die work together to fold the circumferential edge of the first molded part to form a second semi-molded part.

[0007] A preforming mechanism is used to bend the flanges around the second semi-molded product inward to form a folded edge, thereby forming a third semi-molded product.

[0008] The flattening mechanism includes a flattening lower mold and a flattening upper mold that can move up and down relative to the flattening lower mold. The flattening lower mold and the flattening upper mold cooperate to flatten the circumferential fold of the third molded product to obtain a molded baking tray.

[0009] The production line further includes a feeding mechanism for feeding the blank to the corner-punching mechanism, a first transfer mechanism for transferring the first molded part from the corner-punching mechanism to the flanging mechanism, a second transfer mechanism for transferring the second molded part from the flanging mechanism to the pre-forming mechanism, a third transfer mechanism for transferring the third molded part from the pre-forming mechanism to the flattening mechanism, and a feeding mechanism for unloading the molding baking tray.

[0010] In one embodiment of the present invention, the corner punching mechanism includes a corner punching frame, a corner punching guide post connected to the corner punching frame, a corner punching cylinder disposed on the corner punching frame, and a corner punching plate connected to the driving end of the corner punching cylinder and slidably connected to the corner punching guide post. The upper corner punching die is connected to the corner punching plate, and the lower corner punching die is disposed on the corner punching frame. The lower corner punching die includes a lower template and a material support plate disposed at the four corners of the lower template. The upper corner punching die includes four punches correspondingly disposed above the material support plate.

[0011] In one embodiment of the present invention, the flanging mechanism includes a flanging frame, a pressure platform connected to the flanging frame, a flanging guide post connected to the pressure platform, a flanging cylinder disposed on the punching frame, and a flanging plate connected to the driving end of the flanging cylinder and slidably connected to the flanging guide post. The lower flanging die is disposed on the pressure platform. The upper flanging die includes an upper die body, an upper spring, and a flanging pressure plate floating within the upper die body via the upper spring. The lower flanging die includes a lower die body, a lower spring, and a flanging top plate floating within the lower die body via the lower spring. The flanging pressure plate is disposed relative to the flanging top plate. When the flanging top plate is subjected to downward pressure, its lower end can contact the pressure platform. The upper die body can enter the lower die body along with the flanging top plate when it moves downward.

[0012] In one embodiment of the present invention, the preforming mechanism includes a preforming frame and a limiting frame, a primary preforming device, and a secondary preforming device respectively disposed on the preforming frame. The limiting frame is provided with a top plate that can float up and down. The top plate is used to place the second semi-molded product. The primary preforming device includes a driving device, a guide plate that is driven by the driving device to move up and down along the limiting frame, and a pressing device disposed on the guide plate. The pressing device includes edge pressing units disposed on the inner side of the flange at the four sides of the second semi-molded product and corner pressing units disposed on the inner side of the flange at the four corners of the second semi-molded product. Each edge pressing unit and each corner pressing unit can move up and down and horizontally along the limiting frame. The secondary preforming device includes edge pushing units disposed on the outer side of the flange at the four sides of the second semi-molded product and corner pushing units disposed on the outer side of the flange at the four corners of the second semi-molded product. Each edge pushing unit and each corner pushing unit can move horizontally along the limiting frame.

[0013] In one embodiment of the present invention, the edge pressing unit and / or the corner pressing unit includes a bracket connected to the lower end face of the guide plate, a slider slidably connected to the bracket, a drive motor connected to the bracket, a pressing cylinder connected to the slider, and a pressing block connected to the driving end of the pressing cylinder. The pressing cylinder is driven by the drive motor to slide horizontally along the lower end face of the guide plate.

[0014] In one embodiment of the present invention, the side pressing unit and / or the corner pressing unit includes a pressing cylinder and a pressing block connected to the driving end of the pressing cylinder. The pressing block is driven by the pressing cylinder to slide horizontally along the upper surface of the limiting frame.

[0015] In one embodiment of the present invention, a side clamping unit is provided on the upper inner side of each of the four sides of the limiting frame, and a corner clamping unit is provided on the upper inner side of each of the four corners of the limiting frame. The clamping blocks in the four side clamping units and the clamping blocks in the four corner clamping units can form a tight clamping frame at a predetermined position.

[0016] In one embodiment of the present invention, the clamping block in the edge clamping unit is elongated and has a strip-shaped protrusion along the inner side of its side facing the limiting frame; the clamping block in the corner clamping unit is block-shaped and has an arc-shaped protrusion along the inner side of its corner facing the limiting frame; the pushing block in the edge pushing unit is elongated and has a strip-shaped pressing edge along the outer side of its side facing the limiting frame; the pushing block in the corner pushing unit is L-shaped and has an arc-shaped pressing edge along the outer side of its corner facing the limiting frame.

[0017] In one embodiment of the present invention, an elastic element is provided between the top plate and the bottom of the limiting frame. In the initial state, the elastic element applies an upward force to the top plate so that the upper surface of the top plate is flush with the limiting frame.

[0018] In one embodiment of the present invention, the flattening mechanism includes a flattening frame, a flattening guide post connected to the flattening frame, a flattening cylinder disposed on the punching frame, and a pressing plate connected to the driving end of the flattening cylinder and slidably connected to the flattening guide post. The upper flattening die is connected to the pressing plate, and the lower flattening die is disposed on the flattening frame. The upper flattening die includes a flattening die body, a flattening spring, and a floating plate floating within the flattening die body via the flattening spring. The flattening die body has a pressing groove in the circumferential direction of the floating plate that is in close contact with the folded edge of the third semi-molded product. The lower flattening die has a placement groove for placing the third semi-molded product.

[0019] The technical solution of the present invention has the following advantages compared with the prior art:

[0020] The automated production line for enclosed flat baking trays described in this invention requires only two workers for feeding and receiving materials. The remaining work is automated through various mechanisms along the entire production line, saving manpower, equipment resources, turnaround time, and space. From raw materials to flattening and forming, the entire process is automated. For different specifications of enclosed flat baking trays, only the specifications of the corresponding components in the corner punching mechanism, flanging mechanism, pre-forming mechanism, and flattening mechanism need to be changed. This invention changes the original splicing production process of enclosed flat baking trays, avoiding welding and polishing, while improving the flatness and strength of the enclosed flat baking trays. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1a This is a schematic diagram of the four corners of the main body after being punched in the production of an existing closed flat baking pan.

[0023] Figure 1bThis is a schematic diagram of the four sides of the main body after being bent during the production of an existing closed flat baking pan.

[0024] Figure 1c This is a schematic diagram of the closed-body molding process in the production of existing closed flat baking trays.

[0025] Figure 1d This is a schematic diagram of the process of blanking material from the four corners of a punch press in the production of existing closed flat baking trays.

[0026] Figure 1e This is a schematic diagram of the four corners being formed by a punch press in the production of existing closed flat baking trays.

[0027] Figure 1f This is a schematic diagram of the welding and polishing of the main body and four corners in the production of existing closed flat baking pans.

[0028] Figure 2a This is a schematic diagram of the first semi-finished product in this invention.

[0029] Figure 2b This is a schematic diagram of the second semi-molded article in this invention.

[0030] Figure 2c This is a schematic diagram of the first preformed product in this invention.

[0031] Figure 2d This is a schematic diagram of the second preformed product in this invention.

[0032] Figure 2e This is a schematic diagram of the forming baking tray in this invention.

[0033] Figure 3 This is a schematic diagram of the automated production line structure of the present invention.

[0034] Figure 4a This is a schematic diagram of the punching mechanism of the present invention.

[0035] Figure 4b This is a schematic diagram of the structure of the upper punching die and the lower punching die of the present invention.

[0036] Figure 5a This is a schematic diagram of the flange mechanism of the present invention.

[0037] Figure 5b This is a schematic diagram of the structure of the upper and lower flange molds of the present invention.

[0038] Figure 6a This is a schematic diagram of the preforming mechanism structure of the present invention.

[0039] Figure 6b This is a schematic diagram of the main structure of the preforming mechanism of the present invention.

[0040] Figure 6cThis is a schematic diagram of the pressing device of the present invention.

[0041] Figure 6d This is a bottom view of the pressing device of the present invention.

[0042] Figure 6e This is a schematic diagram of the secondary preforming device of the present invention.

[0043] Figure 6f This is a bottom view of the secondary preforming device of the present invention.

[0044] Figure 6g This is a schematic diagram of the preforming step (downward movement step) of the present invention.

[0045] Figure 6h This is a schematic diagram of the preforming step (outward movement step) of the present invention.

[0046] Figure 6i This is a schematic diagram of the preforming step (pressing step) of the present invention.

[0047] Figure 6j This is a schematic diagram of the preforming step (pushing step) of the present invention.

[0048] Figure 7a This is a schematic diagram of the flattening mechanism of the present invention.

[0049] Figure 7b This is a first-view structural diagram of the flattening upper mold and flattening lower mold of the present invention.

[0050] Figure 7c This is a second-view structural diagram of the flattening upper mold and flattening lower mold of the present invention.

[0051] Explanation of reference numerals in the instruction manual:

[0052] 110. First semi-finished product; 120. Second semi-finished product; 130. Third semi-finished product; 131. First pre-formed product; 132. Second pre-formed product; 140. Forming baking tray;

[0053] 1. Corner punching mechanism; 11. Lower corner punching die; 111. Lower template; 112. Material support plate; 12. Upper corner punching die; 13. Corner punching frame; 14. Corner punching guide post; 15. Corner punching plate; 16. Corner punching cylinder;

[0054] 2. Flanging mechanism; 21. Lower flanging die; 211. Lower die body; 212. Flanging top plate; 22. Upper flanging die; 221. Upper die body; 222. Flanging pressure plate; 23. Flanging frame; 24. Pressure platform; 25. Flanging guide post; 26. Flanging cylinder; 27. Flanging plate;

[0055] 3. Preforming mechanism; 30. Preforming frame; 31. Limiting frame; 311. Elastic element; 32. Top plate; 33. Drive device; 331. Linear guide post; 332. Drive cylinder; 34. Guide plate; 35a. Edge clamping unit; 35b. Corner clamping unit; 351. Bracket; 352. Slider; 353. Drive motor; 354. Clamping cylinder; 355. Clamping block; 356. Strip boss; 357. Arc boss; 36a. Edge pushing unit; 36b. Corner pushing unit; 361. Pushing cylinder; 362. Pushing block; 363. Strip edge pressing; 364. Arc edge pressing;

[0056] 4. Flattening mechanism; 41. Lower flattening mold; 411. Placement groove; 42. Upper flattening mold; 421. Flattening mold body; 422. Floating plate; 423. Pressing groove; 43. Flattening frame; 44. Flattening guide post; 45. Flattening cylinder; 46. Pressing plate;

[0057] 5. Feeding mechanism;

[0058] 6. First transfer agency;

[0059] 7. Second transfer agency;

[0060] 8. Third-party transfer agency;

[0061] 9. Feeding mechanism. Detailed Implementation

[0062] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0063] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0064] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0065] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0066] Reference Figure 3 As shown, an automated production line for a closed flat baking pan according to the present invention includes:

[0067] The corner punching mechanism 1 includes a lower corner punching die 11 and an upper corner punching die 12 that can move up and down relative to the lower corner punching die 11. The upper corner punching die 12 and the lower corner punching die 11 cooperate to punch a rectangular blank into a first semi-finished product 110 with four arc corners.

[0068] The flanging mechanism 2 includes a lower flanging die 21 and an upper flanging die 22 that can move up and down relative to the lower flanging die 21. The upper flanging die 22 and the lower flanging die 21 cooperate to fold the circumferential edge of the first molded part to form a second semi-molded product 120.

[0069] The preforming mechanism 3 is used to bend the flanges around the second semi-molded product 120 inward to form a folded edge, thereby forming the third semi-molded product 130.

[0070] The flattening mechanism 4 includes a flattening lower mold 41 and a flattening upper mold 42 that can move up and down relative to the flattening lower mold 41. The flattening lower mold 41 and the flattening upper mold 42 cooperate to flatten the circumferential fold of the third molded product to obtain the molding baking tray 140.

[0071] The production line also includes a feeding mechanism 5 for feeding the blank to the corner-punching mechanism 1, a first transfer mechanism 6 for transferring the first molded part from the corner-punching mechanism 1 to the flanging mechanism 2, a second transfer mechanism 7 for transferring the second molded part from the flanging mechanism 2 to the pre-forming mechanism 3, a third transfer mechanism 8 for transferring the third molded part from the pre-forming mechanism 3 to the flattening mechanism 4, and a feeding mechanism 9 for unloading the forming baking tray 140. A control console is provided to control the various mechanisms of the entire production line to perform automated production and conveying.

[0072] In this embodiment, both the feeding mechanism 5 and the unloading mechanism 9 include a conveyor belt and a robotic arm located beside the conveyor belt; the first transfer mechanism 6, the second transfer mechanism 7, and the third transfer mechanism 8 are robotic arms. The production line of this invention requires only two workers for feeding and receiving materials; all other work is automated through a control console, which controls the various mechanisms of the entire production line, saving manpower, equipment resources, turnaround time, and space. From raw materials to flattening and forming, the entire process is automated, pre-set, debugged, and controlled via a control console. For different specifications of closed flat baking trays, only the corresponding component specifications in the corner-punching mechanism 1, the flanging mechanism 2, the pre-forming mechanism 3, and the flattening mechanism 4 need to be changed; the original splicing production process of the closed flat baking tray (such as...) has been changed. Figures 2a-2e This avoids welding and polishing, while improving the flatness and strength of the enclosed flat baking pan.

[0073] Reference Figure 4a , Figure 4b As shown, the corner punching mechanism 1 includes a corner punching frame 13, a corner punching guide post 14 connected to the corner punching frame 13, a corner punching cylinder 16 disposed on the corner punching frame 13, and a corner punching plate 15 connected to the driving end of the corner punching cylinder 16 and slidably connected to the corner punching guide post 14. The upper corner punching die 12 is connected to the corner punching plate 15, and the lower corner punching die 11 is disposed on the corner punching frame 13. The lower corner punching die 11 includes a lower template 111 and material support plates 112 disposed at the four corners of the lower template 111. The upper corner punching die 12 includes four punches correspondingly disposed above the material support plates 112.

[0074] The working process of the corner punching mechanism 1 is as follows: the raw material (blank) is placed in the lower corner punching die 11 in the corner punching mechanism 1; the corner punching cylinder 16 moves down, driving the upper corner punching die 12 connected to the corner punching plate 15 to punch the raw material, and the corner punching waste is lifted out by the material support plates 112 at the four corners of the lower die plate 111. After the corner punching is completed, the corner punching cylinder 16 moves up to return to its original position, and the first semi-finished product 110 is obtained, and the corner punching process ends.

[0075] Reference Figure 5a , Figure 5bAs shown, the flanging mechanism 2 includes a flanging frame 23, a pressure platform 24 connected to the flanging frame 23, a flanging guide post 25 connected to the pressure platform 24, a flanging cylinder 26 disposed on the punching frame 13, and a flanging plate 27 connected to the driving end of the flanging cylinder 26 and slidably connected to the flanging guide post 25. The lower flanging die 21 is disposed on the pressure platform 24, and the upper flanging die 22 includes an upper die body 221, an upper spring, and a plate floating on the upper die body 221 via the upper spring. The flanged pressure plate 222 is located inside the mold body 221. The lower flanged mold 21 includes a lower mold body 211, a lower spring, and a flanged top plate 212 that is floating inside the lower mold body 211 via the lower spring. The flanged pressure plate 222 is positioned relative to the flanged top plate 212. When the flanged top plate 212 is subjected to downward pressure, its lower end can contact the pressure plate 24. The upper mold body 221 can enter the lower mold body 211 along with the flanged top plate 212 when it moves downward.

[0076] The working process of the flanging mechanism 2 is as follows: The first semi-finished product 110 is placed in the lower flanging mold 21 of the flanging mechanism 2; the flanging cylinder 26 moves downward, driving the flanging pressure plate 222 in the upper flanging mold 22 connected to the flanging plate 27 to press down on the first semi-finished product 110. Under the action of the upper spring, the flanging pressure plate 222 presses down on the semi-finished product, and the upper flanging mold 22 continues to move downward and presses against the first semi-finished product 110. Subsequently, the upper flanging mold 22, the first semi-finished product 110, and the flanging plate press down on the semi-finished product. The top plate 212 enters the lower flanging mold 21 together until the flanging top plate 212 is in contact with the pressure table 24 to obtain the second half-molded product 120. After the flanging is completed, the flanging cylinder 26 moves upward. Under the action of the lower spring, the flanging top plate 212, the second half-molded product 120, the flanging upper mold 22, and the flanging pressure plate 222 move upward together. The second half-molded product 120 remains on the flanging top plate 212 under the action of the flanging pressure plate 222 and the flanging top plate 212. At this point, the flanging process is over.

[0077] Reference Figures 6a-6f As shown, the preforming mechanism 3 includes a preforming frame 30, and the preforming frame 30 is provided with:

[0078] The limiting frame 31 has a top plate 32 that can float up and down inside. The top plate 32 is used to place the second semi-molded product 120, which is rectangular and has a flange in the circumference.

[0079] A preforming device includes a driving device 33, a guide plate 34 driven by the driving device 33 to move up and down along the limiting frame 31, and a pressing device disposed on the guide plate 34. The pressing device includes edge pressing units 35a disposed on the inner side of the flange at the four sides of the second semi-molded product 120 and corner pressing units 35b disposed on the inner side of the flange at the four corners of the second semi-molded product 120. Each edge pressing unit 35a and each corner pressing unit 35b can move up and down and horizontally along the limiting frame 31.

[0080] The secondary preforming device includes edge pressing units 36a located on the outer side of the flange at the four sides of the second semi-molded product 120 and corner pressing units 36b located on the outer side of the flange at the four corners of the second semi-molded product 120. Each edge pressing unit 36a and each corner pressing unit 36b can move horizontally along the limiting frame 31.

[0081] Specifically, an elastic element 311 is provided between the bottom of the top plate 32 and the bottom of the limiting frame 31. In the initial state, the elastic element 311 applies an upward force to the top plate 32, making the upper surface of the top plate 32 flush with the limiting frame 31. In this embodiment, the elastic element 311 is a spring.

[0082] Specifically, the preforming frame 30 is equipped with a worktable, and the driving device 33 includes linear guide posts 331 mounted on the worktable and driving cylinders 332 mounted on the preforming frame 30. The guide plate 34 is slidably connected to the linear guide posts 331, and the driving end of the driving cylinder 332 is connected to the upper surface of the guide plate 34. In this embodiment, four linear guide posts 331 are provided, and two large-diameter heavy-duty cylinders are used for the driving cylinders 332, ensuring the stability and smoothness of the guide plate 34 and the pressing device on the guide plate 34 during the downward and upward processes.

[0083] Specifically, the edge clamping unit 35a and / or the corner clamping unit 35b includes a bracket 351 connected to the lower end face of the guide plate 34, a slider 352 slidably connected to the bracket 351, a drive motor 353 connected to the bracket 351, a clamping cylinder 354 connected to the slider 352, and a clamping block 355 connected to the drive end of the clamping cylinder 354. The clamping cylinder 354 is driven by the drive motor 353 to slide horizontally along the lower end face of the guide plate 34. In this embodiment, the drive motor 353 is a stepper motor.

[0084] In this embodiment, the pressing block 355 in the edge pressing unit 35a is elongated and has a strip-shaped protrusion 356 along the inner side of its side facing the limiting frame 31. The pressing block 355 in the corner pressing unit 35b is block-shaped and has an arc-shaped protrusion 357 along the inner side of its corner facing the limiting frame 31. With the above arrangement, the pressing block 355 can be better fitted to the inner side of the flange at the four sides or four corners of the second semi-molded product 120. To prevent the pressing block 355 from shaking when it moves up or down, the pressing cylinder 354 is a dual-axis pressing cylinder 354.

[0085] Specifically, each of the four sides of the limiting frame 31 is provided with a side pressing unit 35a on the upper inner side, and each of the four corners of the limiting frame 31 is provided with a corner pressing unit 35b on the upper inner side.

[0086] Specifically, the side pushing unit 36a and / or the corner pushing unit 36b includes a pushing cylinder 361 and a pushing block 362 connected to the driving end of the pushing cylinder 361. The pushing block 362 is driven by the pushing cylinder 361 to slide horizontally along the upper surface of the limiting frame 31.

[0087] Specifically, the pushing block 362 in the edge pressing unit 36a is elongated and has a strip-shaped pressing edge 363 along its outer side facing the limiting frame 31. The pushing block 362 in the corner pressing unit 36b is L-shaped and has an arc-shaped pressing edge 364 along its outer side facing the limiting frame 31. During the secondary pre-forming action, the strip-shaped pressing edge 363 is positioned opposite to the boss on the pressing block 355 in the edge pressing unit 35a, and the arc-shaped pressing edge 364 is positioned opposite to the arc-shaped boss 357 on the pressing block 355 in the corner pressing unit 35b.

[0088] Specifically, each of the four sides of the limiting frame 31 is provided with a side pushing unit 36a on its horizontal outer side, and each of the four corners of the limiting frame 31 is provided with a corner pushing unit 36b on its horizontal outer side.

[0089] Furthermore, to ensure that the clamping blocks 355 in the edge clamping unit 35a and the corner clamping unit 35b form a tight clamping frame after reaching the predetermined position (i.e., moving outwards to conform to the inner side of the flange of the second semi-molded product 120), the position of the clamping blocks 355 in the corner clamping unit 35b is higher than that of the clamping blocks 355 in the corner clamping unit 35b. Moreover, during downward and upward movement, the clamping blocks 355 in the edge clamping unit 35a only begin to operate after the clamping blocks 355 in the corner clamping unit 35b have reached the position. Similarly, the pushing blocks 362 in the edge pushing unit 36a and the pushing blocks 362 in the corner pushing unit 36b also form a tight clamping frame after reaching the predetermined position (i.e., moving inwards to conform to the outer side of the flange of the second semi-molded product 120).

[0090] The tight-fitting frame formed in the two preforming processes ensures that the inner and outer sides of the four sides and four corners of the second semi-molded product 120 are in a molded state without gaps during the two preforming processes, thus avoiding mold marks or deformation caused by gaps between the clamping blocks 355 or between the pushing blocks 362 during the molding process.

[0091] By forming a two-stage pressure structure through the drive device 33 and the clamping device in the pre-forming device, the segmented clamping and forming of the second semi-molded product 120 can be ensured. In order to avoid friction between the clamping blocks 355 at the four corners and four sides of the clamping device and the second semi-molded product 120 when they move to the predetermined position, the device stops 1-3 mm away from the surface of the second semi-molded product 120 during movement and is then driven by a stepper motor to move to the predetermined position in a suspended state.

[0092] Reference Figure 6g-6j As shown, the working process of the preforming mechanism 3 is as follows:

[0093] The second half-molded product 120 after being flanged is placed into the limiting frame 31 of the preforming frame 30. The limiting frame 31 contains a top plate 32, which is flush with the limiting frame 31 under the action of the elastic element 311.

[0094] The clamping blocks 355 in the four corner clamping units 35b of the clamping device descend and stop 1-3 mm away from the surface of the second semi-molded product 120. Then, under the action of the drive motor 353, the clamping blocks 355 in the four corner clamping units 35b are pushed towards the four corners of the second semi-molded product 120 to the predetermined positions. Then, the clamping blocks 355 in the four side clamping units 35a of the clamping device descend and stop 1-3 mm away from the second semi-molded product 120. Then, under the action of the drive motor 353, the clamping blocks 355 in the four side clamping units 35a are pushed towards the four sides of the second semi-molded product 120 to the predetermined positions.

[0095] Under the action of the drive device 33, the guide plate 34 moves down and drives the pressing device to press the second half-molded product 120. When it continues to press down, the second half-molded product 120 and the top plate 32 are pressed into the limiting frame 31 until they are attached to the mold. The first pre-molding is completed, and the first pre-molded product 131 is obtained.

[0096] Subsequently, the pressing cylinders 361 in the secondary preforming device act simultaneously, pushing the pressing blocks 362 in the four side pressing units 36a and the pressing blocks 362 in the four corner pressing units 36b to push and bend the flanges around the first preformed product 131 inward to form the second preformed product 132 (i.e. the third semi-molded product 130), and the secondary preforming action is completed.

[0097] After the preforming action is completed, the secondary preforming device is reset, the second preformed product 132 is released, the guide plate 34 moves upward, and during the upward movement, the top plate 32, under the action of the spring, causes the second preformed product 132 to move upward with the guide plate 34, gradually rising along the limiting frame 31. When the top plate 32 drives the second preformed product 132 to a position level with the height of the limiting frame 31, the clamping blocks 355 of the clamping device retract under the drive of the drive motor 353, and then rise and reset under the action of the clamping cylinder 354. After the clamping blocks 355 in the side clamping unit 35a return to their positions, the clamping blocks 355 in the corner clamping unit 35b are retracted under the drive of the drive motor 353, and then rise and reset under the action of the clamping cylinder 354. At this point, the two preforming processes are completed, and the third semi-molded product 130 is placed flat on the limiting frame 31 and the top plate 32.

[0098] Reference Figure 7a , Figure 7b , Figure 7c As shown, the flattening mechanism 4 includes a flattening frame 43, a flattening guide post 44 connected to the flattening frame 43, a flattening cylinder 45 disposed on the punching frame 13, and a pressing plate 46 connected to the driving end of the flattening cylinder 45 and slidably connected to the flattening guide post 44. The upper flattening die 42 is connected to the pressing plate 46, and the lower flattening die 41 is disposed on the flattening frame 43. The upper flattening die 42 includes a flattening die body 421, a flattening spring, and a floating plate 422 floating within the flattening die body 421 via the flattening spring. The flattening die body 421 has a pressing groove 423 in the circumferential direction of the floating plate 422 that is pressed and engaged with the circumferential folded edge of the third semi-molded product 130. The lower flattening die 41 has a placement groove 411 for placing the third semi-molded product 130.

[0099] The working process of the flattening mechanism 4 is as follows: The third molded product is placed in the flattening lower mold 41 in the flattening mechanism 4; the flattening mechanism moves downward, driving the floating plate 422 connected to the flattening plate 46 to press the semi-finished product; under the action of the flattening spring, the floating plate 422 presses the third molded product, and the flattening upper mold 42 continues to move downward until it is in contact with the flattening lower mold 41. The bent edges of the third molded product are flattened to obtain the forming baking tray 140; after the flattening is completed, the flattening cylinder 45 moves upward, the flattening upper mold 42 disengages from the flattening lower mold 41, and the floating plate 422 presses the forming baking tray 140 under the action of the flattening spring to prevent the forming baking tray 140 from falling down after moving upward with the flattening upper mold 42. The flattening process ends here.

[0100] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A closed-loop automated production line for flat baking trays, characterized in that, include: The corner punching mechanism (1) includes a lower corner punching die (11) and an upper corner punching die (12) that can move up and down relative to the lower corner punching die (11). The upper corner punching die (12) and the lower corner punching die (11) work together to punch a rectangular blank into a first semi-finished product (110) with four arc corners. The flanging mechanism (2) includes a lower flanging die (21) and an upper flanging die (22) that can move up and down relative to the lower flanging die (21). The upper flanging die (22) and the lower flanging die (21) work together to fold the circumferential edge of the first semi-molded product (110) to form a second semi-molded product (120). The preforming mechanism (3) is used to bend the flanges around the second semi-molded product (120) inward to form a folded edge, thereby forming the third semi-molded product (130). The flattening mechanism (4) includes a flattening lower mold (41) and a flattening upper mold (42) that can move up and down relative to the flattening lower mold (41). The flattening lower mold (41) and the flattening upper mold (42) cooperate to flatten the circumferential fold of the third semi-molded product (130) to obtain a molding baking tray (140). The production line further includes a feeding mechanism (5) for feeding the blank to the corner punching mechanism (1), a first transfer mechanism (6) for transferring the first semi-molded product (110) from the corner punching mechanism (1) to the flanging mechanism (2), a second transfer mechanism (7) for transferring the second semi-molded product (120) from the flanging mechanism (2) to the preforming mechanism (3), a third transfer mechanism (8) for transferring the third semi-molded product (130) from the preforming mechanism (3) to the flattening mechanism (4), and a feeding mechanism (9) for unloading the forming baking tray (140). The preforming mechanism (3) includes a preforming frame (30) and a limiting frame (31), a primary preforming device, and a secondary preforming device respectively disposed on the preforming frame (30). The limiting frame (31) is provided with a top plate (32) that can float up and down. The top plate (32) is used to place the second semi-molded product (120). The primary preforming device includes a driving device (33), a guide plate (34) that is driven by the driving device (33) to move up and down along the limiting frame (31), and a pressing device disposed on the guide plate (34). The pressing device includes edge pressing devices disposed on the inner side of the flange at the four sides of the second semi-molded product (120). The unit (35a) and the corner pressing unit (35b) located on the inner side of the flange at the four corners of the second semi-molded product (120) are provided. Each of the edge pressing units (35a) and each of the corner pressing units (35b) can move up and down and horizontally along the limiting frame (31). The secondary preforming device includes the edge pressing unit (36a) located on the outer side of the flange at the four sides of the second semi-molded product (120) and the corner pressing unit (36b) located on the outer side of the flange at the four corners of the second semi-molded product (120). Each of the edge pressing units (36a) and each of the corner pressing units (36b) can move horizontally along the limiting frame (31). The edge clamping unit (35a) and / or the corner clamping unit (35b) include a bracket (351) connected to the lower end face of the guide plate (34), a slider (352) slidably connected to the bracket (351), a drive motor (353) connected to the bracket (351), a clamping cylinder (354) connected to the slider (352), and a clamping block (355) connected to the drive end of the clamping cylinder (354). The clamping cylinder (354) is driven by the drive motor (353) to slide horizontally along the lower end face of the guide plate (34). The side pressing unit (36a) and / or the corner pressing unit (36b) include a pressing cylinder (361) and a pressing block (362) connected to the driving end of the pressing cylinder (361). The pressing block (362) is driven by the pressing cylinder (361) to slide horizontally along the upper surface of the limiting frame (31). Each of the four sides of the limiting frame (31) is provided with an inner upper side edge clamping unit (35a), and each of the four corners of the limiting frame (31) is provided with a corner clamping unit (35b). The clamping blocks (355) in the four edge clamping units (35a) and the clamping blocks (355) in the four corner clamping units (35b) can form a tight clamping frame at a predetermined position.

2. The closed-loop flat baking tray automated production line according to claim 1, characterized in that, The corner punching mechanism (1) includes a corner punching frame (13), a corner punching guide post (14) connected to the corner punching frame (13), a corner punching cylinder (16) provided on the corner punching frame (13), and a corner punching plate (15) connected to the driving end of the corner punching cylinder (16) and slidably connected to the corner punching guide post (14). The upper corner punching die (12) is connected to the corner punching plate (15). The lower corner punching die (11) is provided on the corner punching frame (13). The lower corner punching die (11) includes a lower template (111) and a material support plate (112) provided at the four corners of the lower template (111). The upper corner punching die (12) includes four punches corresponding to the material support plate (112) above it.

3. The closed-loop automated production line for flat baking trays according to claim 2, characterized in that, The flanging mechanism (2) includes a flanging frame (23), a pressure plate (24) connected to the flanging frame (23), a flanging guide post (25) connected to the pressure plate (24), a flanging cylinder (26) provided on the punching frame (13), and a flanging plate (27) connected to the driving end of the flanging cylinder (26) and slidably connected to the flanging guide post (25). The lower flanging die (21) is provided on the pressure plate (24), and the upper flanging die (22) includes an upper die body (221), an upper spring, and a plate floating on the upper die body via the upper spring. The flanged pressure plate (222) is located inside the mold body (221). The flanged lower mold (21) includes a lower mold body (211), a lower spring, and a flanged top plate (212) that is floating inside the lower mold body (211) via the lower spring. The flanged pressure plate (222) is positioned relative to the flanged top plate (212). When the flanged top plate (212) is subjected to downward pressure, its lower end can contact the pressure plate (24). The upper mold body (221) can enter the lower mold body (211) along with the flanged top plate (212) when it moves downward.

4. The closed-loop automated production line for flat baking trays according to claim 1, characterized in that, The clamping block (355) in the edge clamping unit (35a) is elongated and has a strip-shaped protrusion (356) on the inner side of its side facing the limiting frame (31). The clamping block (355) in the corner clamping unit (35b) is block-shaped and has an arc-shaped protrusion (357) on the inner side of its corner facing the limiting frame (31). The pushing block (362) in the edge pushing unit (36a) is elongated and has a strip-shaped pressing edge (363) on the outer side of its side facing the limiting frame (31). The pushing block (362) in the corner pushing unit (36b) is L-shaped and has an arc-shaped pressing edge (364) on the outer side of its corner facing the limiting frame (31).

5. The closed-loop flat baking tray automated production line according to claim 4, characterized in that, An elastic element (311) is provided between the bottom of the top plate (32) and the bottom of the limiting frame (31). In the initial state, the elastic element (311) applies an upward force to the top plate (32) so that the upper surface of the top plate (32) is flush with the limiting frame (31).

6. The closed-loop automated production line for flat baking trays according to claim 2, characterized in that, The flattening mechanism (4) includes a flattening frame (43), a flattening guide post (44) connected to the flattening frame (43), a flattening cylinder (45) disposed on the punching frame (13), and a pressing plate (46) connected to the driving end of the flattening cylinder (45) and slidably connected to the flattening guide post (44). The upper flattening die (42) is connected to the pressing plate (46), and the lower flattening die (41) is disposed on the flattening frame (43). The flat upper mold (42) includes a flattening mold body (421), a flattening spring, and a floating plate (422) floating inside the flattening mold body (421) via the flattening spring. The flattening mold body (421) has a pressing groove (423) in the circumference of the floating plate (422) that is in close contact with the circumferential folding edge of the third semi-molded product (130). The flattening lower mold (41) has a placement groove (411) for placing the third semi-molded product (130).

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