Preheating pressing method

Abstract

The invention discloses a preheating pressing method, which belongs to the field of pressing forming and comprises the following steps of: 1, softening a material to be pressed; 2, the softened materials are placed in a lower die, the upper die and the lower die are driven to be closed, and the materials are contained in a cavity defined by the upper die and the lower die; 3, applying vertical and lateral acting forces to the materials in the cavity through pressing equipment, and performing pressing forming; 4, after pressing is completed, the upper die and the lower die are locked through a locking mechanism of the die, and pressure maintaining is conducted; 5, the locked mold is moved out of the pressing equipment, so that the pressing equipment is released for follow-up operation; 6, after pressure maintaining is finished, the locking state of the locking mechanism is relieved, the upper mold and the lower mold are separated, and then core pulling is conducted to relieve lateral constraint on a formed product; and 7, a formed product is taken out of the lower die. According to the preheating pressing method, the automation level and efficiency of production can be improved.

Description

Technical Field

[0001] This invention relates to the field of compression molding, specifically a preheating compression molding method. Background Technology

[0002] In the food industry and other fields, the regularity and consistency of product shape are key indicators affecting consumer purchasing intentions and product market competitiveness during the production of solid foods such as candies, pastries, and processed agricultural products. To achieve this goal, pressing and shaping is a core process in some food production processes. It applies stable pressure to the raw materials through molds, causing the materials to form a preset shape under the constraint of the mold cavity. The pressure holding stage after pressing is an important guarantee to ensure the stability of the product shape and prevent deformation. Together, they determine the uniformity of product shape and dimensional accuracy in mass production.

[0003] Current technologies often employ in-mold softening during the pressing process. This involves directly placing the dry, hard material to be pressed into the mold cavity and softening it through the mold's built-in heating module or an external heat source. This method requires independent heating and waiting time for each pressing cycle, resulting in an excessively long softening period and reduced overall production efficiency.

[0004] Secondly, during the pressure holding stage, existing technologies rely on the continuous output pressure of the pressing equipment to maintain mold closure. This results in the pressing equipment being ineffectively occupied throughout the entire pressure holding period, unable to perform new pressing tasks. Its effective working time is significantly reduced, resulting in low unit capacity and difficulty in meeting the high efficiency demands of modern large-scale production. Summary of the Invention

[0005] The purpose of this invention is to address the above problems by providing a preheating and pressing method that can improve the level of automation and efficiency in production.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is a preheating pressing method, which includes the following steps:

[0007] 1) Soften the material to be pressed;

[0008] 2) Place the softened material in the lower mold, and then drive the upper mold and lower mold to close, so that the material is contained in the cavity formed by the upper mold and lower mold;

[0009] 3) Vertical and lateral forces are applied to the material in the cavity using a pressing device to perform pressing and molding;

[0010] 4) After pressing, the upper and lower molds are locked together using the mold's own locking mechanism to maintain pressure.

[0011] 5) Remove the locked mold from the pressing equipment to release the pressing equipment for subsequent operations;

[0012] 6) After the pressure holding is completed, release the locking mechanism, separate the upper mold and the lower mold, and then perform core pulling to release the lateral constraint on the molded product;

[0013] 7) Remove the molded product from the lower mold.

[0014] In this invention, by placing the material softening step beforehand and making it independent of the pressing process, the traditional in-mold heating method, which requires waiting for the material to slowly conduct heat within the cavity in each cycle, is avoided. This enables batch, uniform, and rapid softening of the material, fundamentally shortening the pre-processing time for a single product cycle and laying the foundation for faster overall production. Furthermore, the mold's built-in locking mechanism achieves a pressure-holding function, ensuring that the pressing equipment is only briefly occupied during the pressing phase. After pressing, the mold can be removed from the equipment for offline pressure holding, and the equipment can then be immediately put into the next round of pressing. This avoids the problem of the pressing equipment being ineffectively occupied during a long pressure holding period, thereby improving production efficiency and adapting to the needs of large-scale, high-speed production.

[0015] Furthermore, pressing, pressure holding, separation of the upper and lower molds, and release of lateral constraints on the molded product are all completed within the molding system. The molding system includes a pressing device, an upper and lower mold separation section, a core-pulling section, and matching molds. The lower mold is transferred between the pressing device and the core-pulling section via a connecting conveyor mechanism, which has a material placement area. A mold transfer mechanism is provided between the pressing device and the upper and lower mold separation section to transfer the upper mold. A pressure-holding transport section is provided between the pressing device and the upper and lower mold separation section to transfer the mold in a pressure-holding state. By integrating core processes such as pressing, pressure-holding transport, mold opening, and core pulling, along with their corresponding conveyor mechanisms, into a unified system, a fully automated closed-loop operation from material placement to product removal is achieved. Simultaneously, the connecting conveyor mechanism, pressure-holding transport section, and mold transfer mechanism ensure clear and non-interfering flow paths for the upper mold, lower mold, and the entire mold set, significantly shortening the transfer waiting time between processes, increasing production cycle time, and making the equipment layout more compact and rational.

[0016] Furthermore, when pressing spherical, conical, or products with features such as undercuts or side recesses, if only a vertical mold opening method is used, the product is easily scratched by the inner wall of the mold cavity or the protruding structure during the demolding process, which leads to surface damage, increased breakage rate, and decreased yield. Therefore, the mold includes an upper mold and a lower mold. The upper mold includes an upper mold plate and an upper mold core fixedly installed on the upper mold plate. The lower mold includes a lower mold plate and a lower mold core fixedly installed on the lower mold plate. The upper mold and the lower mold are locked together by a locking mechanism provided thereon. The lower mold also includes a lower core that mates with the lower mold core. The back of the lower core is fixedly connected to a lower mold pull rod. The lower mold pull rod is laterally slidably disposed within the lower mold plate. The upper mold also includes an upper core that mates with the upper mold core. The back of the upper core is fixedly connected to the upper mold pull rod. The upper mold pull rod is laterally slidably disposed within the upper mold plate. At least one end of the upper mold pull rod extends out of the upper mold plate, and at least one end of the lower mold pull rod extends out of the lower mold plate. The extended ends of the upper mold pull rod and the lower mold pull rod are respectively fixedly connected to a pull-out part. Before the upper and lower molds open, the upper and lower mold pull bars are first driven to slide laterally, causing the upper and lower cores to complete the lateral core-pulling movement first, so as to release the lateral covering of the molded product; then, the upper and lower molds perform a vertical separation action. This can prevent the product from being scratched or torn by the mold cavity during demolding, thereby significantly reducing the product breakage rate and improving the yield and pressing quality.

[0017] Furthermore, the locking mechanism includes a fixed part and a movable part. The fixed part includes a fixed mounting part fixedly installed on the upper mold plate or the lower mold plate, and the fixed mounting part has a locking hole. A limiting part extending inward is provided on one side of the edge of the locking hole. The movable part includes a movable mounting part fixed to the corresponding lower mold pull rod or upper mold pull rod. A vertical column is provided on the movable mounting part, and an expansion part is fixedly provided at the end of the vertical column. The outer diameter of the expansion part is larger than the outer diameter of the vertical column. Moreover, the outer diameter of the expansion part is larger than the diameter of the locking hole at the limiting part, but smaller than the diameter of the locking hole at other parts. In the mold-closed state, the expansion part extends into the locking hole. Then, through the lateral movement of the movable mounting part, the expansion part and the limiting part at least partially overlap and form a mutual interlocking fit, thereby firmly locking the moving mold and the fixed mold into a whole in the mold-closing direction. This allows the moving mold and the fixed mold to become an independent pressure-holding unit after mold closing, eliminating the need for continuous mold-closing force from external pressing equipment.

[0018] Furthermore, to simultaneously lock the upper and lower dies during the pressing process, the pressing equipment includes a pressing support mechanism and a pressure plate. The pressure plate is positioned above the pressing support mechanism and can move vertically. The pressing support mechanism includes a pressing support seat, a pressing conveying section, and a die locking section, all located on the upper surface of the support platform. The pressing conveying section can move vertically. A pressing positioning mechanism is also provided on the support platform. This mechanism includes a front limiting section and a side limiting section. The front limiting section can move vertically, and when it reaches a high position, it restricts the die's position along the conveying direction. The side limiting section includes a side fixed limiting plate and a side movable limiting plate, positioned on either side of the die's conveying direction. The side movable limiting plate can move along the line connecting the side fixed limiting plate and the side movable limiting plate. The front and side limiting sections ensure that each die maintains a consistent position in each pressing cycle.

[0019] Furthermore, the core-pulling section includes a first processing table and a core-pulling plate. A vertically movable lower mold support is provided on one side of the first processing table. A core-pulling drive mechanism on the lower mold support drives the core-pulling plate to move laterally. The upper surface of the first processing table is provided with a mold-receiving conveyor and a mold-feeding conveyor with opposite conveying directions. The mold-receiving conveyor includes transversely spaced conveyor rollers that can rotate around their own axis. The mold-feeding conveyor is vertically movable and has a lower position than the upper surface of the conveyor rollers during its lifting stroke. The mold feeding conveyor is positioned above the upper surface of the conveying roller. A transition conveyor is located at the end of the mold feeding conveyor in the conveying direction, and the mold exit side of the transition conveyor is connected to the connecting conveyor mechanism. An alignment mechanism is also provided on the first processing table. The alignment mechanism includes a fixed reference plate and a movable reference plate positioned on both sides of the mold receiving conveyor in the conveying direction. The movable reference plate moves along the line connecting it to the fixed reference plate under the drive of the alignment driving mechanism. A material removal limiting mechanism is provided at the end of the mold receiving conveyor in the conveying direction to limit the mold to a preset material removal station. The core-pulling plate cooperates with the lower mold's pull-out part, driving the lower core movement by pulling the pull-out part, creating conditions for the material removal part to remove the product. During production, the lower mold is first received and positioned by the mold receiving conveyor. After positioning, the mold receiving conveyor stops operating. At this station, core pulling and product removal operations are completed sequentially. After processing is completed, the mold feeding conveyor rises to its highest position to receive the lower mold located on the mold receiving conveyor. The die delivery conveyor unit is activated, moving the lower die along its conveying direction, thus realizing the handover and direction change from the die receiving conveyor unit to the die delivery conveyor unit. Finally, the lower die is conveyed to the transition conveyor unit, and then transported to the material addition point via the connecting conveyor mechanism. This process enables automatic, continuous, and directional flow of the lower die between the core-pulling unit and the pressing equipment, greatly reducing waiting and repetitive positioning time between processes and improving the automation level of the molding system. Alignment drive mechanism and material removal limit mechanism are used to ensure that the die position remains uniform before each core pulling and material removal.

[0020] Furthermore, the upper and lower mold separation section includes a separation bearing mechanism and a mold opening mechanism. The mold opening mechanism includes an unlocking part for opening the locking mechanism. The separation bearing mechanism includes a second processing table. The upper surface of the second processing table is provided with a separation conveying mechanism, a mold opening positioning mechanism, and a lower mold clamping mechanism. The upper surface of the second processing table is provided with elongated separation guides on both sides of the conveying direction of the separation conveying mechanism. The ends of the separation guides are provided with outwardly extending opening sections. The mold opening positioning mechanism includes positioning protrusions adapted to the positioning grooves on the lower surface of the mold lower mold. The number of positioning protrusions is at least two. The positioning protrusions can move vertically to insert into the positioning grooves, thereby achieving horizontal limiting of the mold lower mold. The lower mold clamping mechanism includes a lower mold clamping part, which rotates along the vertical axis under the drive of the rotary drive mechanism. The mold opening limiting mechanism is provided on the second processing table on the transmission path of the separation conveying mechanism. An unlocking bracket that can move vertically is provided on one side of the second processing table. The unlocking drive mechanism provided on the unlocking bracket drives the unlocking part to move horizontally. By coordinating the vertical movement of the unlocking bracket with the lateral movement of the unlocking part, the unlocking part can be precisely aligned with the pull-out parts on the upper and lower mold pull strips and perform the core-pulling action, thereby completing the unlocking.

[0021] Furthermore, the pressure-holding and transporting unit includes a stacking machine and a lifting mechanism arranged at intervals along the horizontal direction. The loading point of the stacking machine is connected to the discharge point of the pressing equipment, and the discharge point of the lifting mechanism is connected to the upper and lower mold separation section. A mold transfer mechanism is provided between the stacking machine and the lifting mechanism. The lifting mechanism includes a lifting frame, on which a symmetrically arranged and synchronously moving transmission chain group is provided. The conveying direction of the transmission chain group is vertical. A carrying component is provided on the chain of the transmission chain group. The carrying component includes a carrying support and an auxiliary support arranged at intervals along the conveying direction of the transmission chain group. A first roller is rotatably provided on the carrying support, and a second roller is provided on the auxiliary support. A guard plate is provided vertically on the lifting frame. When the first roller and the second roller move to the guard plate, the first roller and the second roller abut against the guard plate. The stacking machine receives and buffers the pressure-holding molds from the pressing equipment. The lifting mechanism lowers the molds to the height where they align with the upper and lower mold separation section. The mold transfer mechanism connects the two to complete the horizontal transfer of the molds. The stacking machine and lifting mechanism optimize the production line layout, making the entire molding system more compact and efficient. The pressure-holding transport section reduces the floor space occupied by the molding system while extending the mold's movement path, allowing the mold to maintain pressure during movement. The first and second rollers maintain rolling contact with the inner surface of the guard plate, forming effective lateral restraint. This close rolling of the first roller and guard plate prevents the support from tilting when the mold is placed, ensuring the support descends vertically during mold transport and avoiding instability caused by tilting. The first and second rollers also reduce chain swaying and tilting during operation, making transport more stable and ensuring accurate positioning of the mold at its final location.

[0022] Furthermore, to facilitate the movement of the mold at different processing positions, the mold transfer mechanism includes a transverse frame. Two sliding seats are spaced apart on the transverse frame along the arrangement direction of the pressing equipment and the upper and lower mold separation parts. A transition platform is provided below the transverse frame between the pressing equipment and the upper and lower mold separation parts. Each sliding seat is equipped with a mold opening gripping mechanism. The mold opening gripping mechanism includes a mold opening lifting part that moves in the vertical direction, and a gripping execution unit is provided on the mold opening lifting part.

[0023] Furthermore, to enable the lower die to move between different workstations and optimize the production line layout, the connecting conveyor mechanism includes a transfer table and a reversing table. The upper surface of the transfer table is equipped with a transfer conveyor mechanism, and the upper surface of the reversing table is equipped with a lower die conveyor mechanism and a reversing conveyor mechanism. The lower die conveyor mechanism and the transfer conveyor mechanism are arranged in the same direction, and a stop is provided at the end of the conveying direction of the lower die conveyor mechanism. The conveying direction of the reversing conveyor mechanism is different from that of the lower die conveyor mechanism, and the reversing conveyor mechanism can move in the vertical direction.

[0024] The beneficial effects of this invention are as follows: By placing the material softening step beforehand, making it independent of the pressing process, it avoids the process of waiting for the material to slowly conduct heat within the cavity in each cycle, as is required in traditional mold-heating methods. This allows for batch, uniform, and rapid softening of the material, fundamentally shortening the pre-processing time for a single product cycle and laying the foundation for faster overall production. The pressure-holding function is achieved through the mold's built-in locking mechanism, ensuring that the pressing equipment is only briefly occupied during the pressing phase. After pressing, the mold can be removed from the equipment for offline pressure holding, and the equipment can then be put into the next round of pressing. This avoids the problem of the pressing equipment being ineffectively occupied during the long pressure holding period, thereby improving production efficiency and adapting to the needs of large-scale, high-speed production. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 This is a top view of the structure of the present invention.

[0027] Figure 3 This is a schematic diagram of the mold in the closed state.

[0028] Figure 4 This is a schematic diagram of the exploded structure of the mold.

[0029] Figure 5 This is a schematic diagram of the upper mold forming surface.

[0030] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0031] Figure 7 This is a schematic diagram of the structure of the lower mold forming surface.

[0032] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point B in the middle.

[0033] Figure 9 This is a schematic diagram of the fit between the upper mold plate and the upper mold tie rod.

[0034] Figure 10 This is a three-dimensional structural diagram of the fixed part and the movable part (in the unlocked state).

[0035] Figure 11 This is a side view structural diagram of the fixed part and the movable part.

[0036] Figure 12 This is a schematic diagram showing the fixed part and the movable part in a locked state.

[0037] Figure 13This is a three-dimensional structural diagram of the feed side of the pressing equipment.

[0038] Figure 14 This is a three-dimensional structural diagram of the discharge side of the pressing equipment.

[0039] Figure 15 This is a schematic diagram of the material discharge side of the pressing equipment.

[0040] Figure 16 This is a schematic diagram of the installation structure for the locking push plate and the side movable limit plate.

[0041] Figure 17 This is a structural diagram of the pressing equipment and the upper and lower mold separation section.

[0042] Figure 18 This is a schematic diagram of the three-dimensional installation structure of the mold-opening gripping mechanism.

[0043] Figure 19 This is a side view of the installation structure of the mold opening and gripping mechanism.

[0044] Figure 20 This is a three-dimensional structural diagram of the upper and lower mold separation section.

[0045] Figure 21 for Figure 20 A magnified schematic diagram of the structure at point C.

[0046] Figure 22 This is a three-dimensional structural diagram of the mold input side of the upper and lower mold separation section.

[0047] Figure 23 This is a schematic diagram of the main structure of the mold input side of the upper and lower mold separation section.

[0048] Figure 24 This is a three-dimensional structural diagram of the second processing table.

[0049] Figure 25 This is a top view of the second processing table (the arrow indicates the direction of mold feeding).

[0050] Figure 26 This is a three-dimensional structural diagram of the first processing table.

[0051] Figure 27 This is a top view of the structure of the first processing table.

[0052] Figure 28 This is a side view of the first processing table.

[0053] Figure 29 This is a three-dimensional structural diagram of the pressure-maintaining transportation department.

[0054] Figure 30 This is a schematic diagram of the main structure of the pressure-holding and transportation department.

[0055] Figure 31 This is a three-dimensional structural diagram of the lifting mechanism.

[0056] Figure 32 for Figure 31 A magnified schematic diagram of the structure at point D in the middle.

[0057] Figure 33 for Figure 31 A magnified schematic diagram of the structure at point E in the middle.

[0058] Figure 34 This is a top view of the lifting mechanism.

[0059] Figure 35 for Figure 34 A magnified schematic diagram of the structure at point F in the middle.

[0060] Figure 36 This is a schematic diagram of the assembly structure connecting the conveying mechanism and the pressing equipment.

[0061] Figure 37 This is a top view of the structure connecting the conveying mechanism and the pressing equipment.

[0062] Figure 38 This is a schematic diagram of the three-dimensional structure of the reversing stage.

[0063] The text labels in the diagram represent: 1. Pressing equipment; 101. Press plate; 102. Supporting platform; 103. Pressing support seat; 104. Pressing conveyor; 105. Core push plate; 106. Front limit part; 107. Side fixed limit plate; 108. Side movable limit plate; 109. Pressing frame; 110. Lateral drive part; 111. Sliding column; 2. Upper and lower mold separation part; 201. Unlocking part; 202. Mold opening lifting part; 203. Second processing table; 204. Separation conveying mechanism; 205. Positioning protrusion; 206. 207. Lower mold clamping part; 208. Separation guide part; 209. Opening section; 210. Rotary drive mechanism; 211. Mold opening limit mechanism; 212. Unlocking bracket; 213. Unlocking drive mechanism; 214. Vertical drive mechanism; 3. Core pulling part; 301. First processing table; 302. Core pulling plate; 303. Lower mold opening bracket; 304. Core pulling drive mechanism; 305. Mold receiving conveyor part; 306. Mold feeding conveyor part; 307. Transition conveyor part; 309. Fixed reference plate; 310. Movable reference plate; 311. Alignment drive mechanism 312. Material Picking Limiting Mechanism; 4. Upper Mold; 401. Upper Mold Sleeve Plate; 402. Upper Mold Core; 403. Upper Core; 404. Upper Mold Tie Rod; 405. Upper Mounting Slot; 406. Upper Mold Base Plate; 5. Lower Mold; 501. Lower Mold Sleeve Plate; 502. Lower Mold Core; 503. Lower Core; 504. Lower Mold Tie Rod; 505. Lower Mounting Slot; 506. Lower Mold Base Plate; 6. Fixed Mounting Part; 601. Locking Hole; 602. Restricting Part; 7. Movable Mounting Part; 701. Vertical Column; 702. Expansion Part; 8. Pull-out Part; 9. 10. Horizontal frame; 11. Sliding seat; 12. Transition platform; 13. Connecting conveyor mechanism; 14. Transfer platform; 15. Reversing platform; 16. Transfer conveyor mechanism; 17. Lower mold conveyor mechanism; 18. Reversing conveyor mechanism; 19. Stop; 20. Stacking machine; 21. Lifting mechanism; 22. Lifting frame; 23. Chain; 24. Load support; 25. Auxiliary support; 26. First roller; 27. Second roller; 28. Guard plate; 29. ​​Groove; 20. Gripping part; 21. Gripping drive mechanism. Detailed Implementation

[0064] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0065] Example 1, as Figures 1 to 38As shown, this embodiment provides a preheating pressing method, wherein pressing, pressure holding, separation of the upper and lower molds, and release of lateral constraints on the molded product are all completed within the molding system. The molding system includes a pressing device 1, an upper and lower mold separation section 2, a core pulling section 3, and matching molds. The lower mold is transferred between the pressing device 1 and the core pulling section 3 via a connecting conveying mechanism 12, which has a material placement area. A mold transfer mechanism is provided between the pressing device 1 and the upper and lower mold separation section 2 to transfer the upper mold. A pressure holding and transport section is provided between the pressing device 1 and the upper and lower mold separation section 2 to transfer the mold in the pressure holding state. Figure 2 The solid arrows in the diagram indicate the direction of mold movement in the closed state, the double dashed arrows indicate the direction of upper mold movement, and the single dashed arrow indicates the direction of lower mold movement. Figure 25 Arrow C in the diagram indicates the direction of mold movement; Figure 27 Arrows A and B in the diagram indicate the direction of movement of the lower mold.

[0066] The mold includes an upper mold 4 and a lower mold 5. The upper mold 4 includes an upper mold plate 401. The front side of the upper mold plate 401 is machined with an upper mounting groove 405 for embedding and mounting the upper mold core 402 and the upper mold core 403. The dimension of the upper mounting groove 405 along the sliding direction of the upper mold core 403 is greater than the total dimension of the upper mold core 402 and the upper mold core 403 in that direction when the mold is closed, thereby providing the necessary space for the sliding of the upper mold core 403. In this application, the side with the cavity is considered the front side, and its reverse side is considered the back side. The cavity surfaces of the upper mold core 402 and the upper mold core 403 together constitute a complete upper mold cavity. A transverse sliding groove is machined on the back side of the upper mold plate 401 by milling or other methods, and the upper mold pull bar 404 is slidably disposed in the sliding groove. An upper extension is fixedly provided on the back of the upper core 403. The upper extension and the upper core 403 can be fixed by bolts or integrally formed. The upper extension is fixedly connected to the upper mold pull rod 404 by bolts, so that the upper mold pull rod 404 can drive the upper core 403 to move. In order to connect the upper mold pull rod 404 and the upper extension together, and to leave sliding space for the upper extension, the back of the upper mounting groove 405 is connected to the sliding groove through a connecting hole. The size of the connecting hole is set to allow the upper extension to connect with the upper mold pull rod and move. The back of the upper mold sleeve plate 401 is closed by a detachable upper mold base plate 406. The upper mold base plate 406 is fixedly connected to the upper mold sleeve plate 401 by bolts or other fasteners.

[0067] The lower mold 5 is adapted to the upper mold 4. The lower mold 5 includes a lower mold sleeve plate 501, with a lower mounting groove 505 on the front for mounting the lower mold core 502 and the lower mold core 503. The cavity surfaces of the lower mold core 502 and the lower mold core 503 together form a complete lower mold cavity. The dimension of the lower mounting groove 505 along the sliding direction of the lower mold core 503 is greater than the total dimension of the lower mold core 502 and the lower mold core 503 in that direction when the mold is closed, thereby providing the necessary space for the sliding of the lower mold core 503. The back of the lower mold sleeve plate 501 is also provided with a sliding groove, and the lower mold pull bar 504 is slidably disposed in the sliding groove of the lower mold sleeve plate 501.

[0068] Both the upper mold pull bar 404 and the lower mold pull bar 504 have at least one protruding end extending out of the corresponding sleeve plate, and are respectively fixedly connected to a pull-out part 8. In this embodiment, for ease of description, the part connected to the upper mold pull bar 404 is named the upper mold pull-out part, and the part connected to the lower mold pull bar 504 is named the lower mold pull-out part. The back of the lower mold sleeve plate 501 is closed by the lower mold base plate 506. The lower mold base plate 506 and the lower mold sleeve plate 501 are coaxially arranged, but the outer diameter of the lower mold base plate 506 is larger than that of the lower mold sleeve plate 501. The lower extension on the lower core 503 is fixedly connected to the lower mold pull bar 504 by bolts, etc., so that the lower mold pull bar 504 can drive the lower core 503 to move. In order to connect the lower mold pull bar 504 and the lower extension, and at the same time leave sliding space for the lower extension, the back of the lower mounting groove 505 is connected to the sliding groove through a connecting hole. The size of the connecting hole is set to allow the lower extension to connect with the lower mold pull bar 504 and move. The upper and lower molds are locked together by a locking mechanism provided thereon.

[0069] The locking mechanism can be a bolt connecting the upper and lower molds, and the locking part and unlocking part 201 of the mold can be an electric screwdriver. In this embodiment, the locking mechanism includes a fixed part and a movable part. The fixed part includes a fixed mounting part 6 fixedly installed on the upper mold sleeve plate 401 or the lower mold sleeve plate 501. The fixed mounting part 6 has a locking hole 601, and a limiting part 602 extending inward is provided on one side of the edge of the locking hole 601. The movable part includes a movable mounting part 7 fixedly installed on the corresponding lower mold pull bar 504 or the upper mold pull bar 404. A vertical column 701 is provided on the movable mounting part 7. An expansion part 702 is fixedly provided at the end of the vertical column 701. The outer diameter of the expansion part 702 is larger than the outer diameter of the vertical column 701. Furthermore, the outer diameter of the expansion part 702 is larger than the diameter of the locking hole 601 at the limiting part 602, but smaller than the diameter of other parts of the locking hole 601. In this embodiment, the fixed mounting part 6 is installed on the lower mold sleeve plate 501 for explanation, and the corresponding movable mounting part 7 is fixed on the upper mold pull rod. The fixed mounting part 6 and the movable mounting part 7 are respectively installed in the upper and lower mounting grooves. The mold core is not installed in the upper and lower mounting grooves of the fixed mounting part 6 and the movable mounting part 7, and the size of the connecting hole on the back of the upper mounting groove 405 is set to allow the movable mounting part 7 to connect with the upper mold pull rod and move.

[0070] The pressing device 1 includes a pressing support mechanism, a pressure plate 101, and a pressing positioning mechanism. The pressure plate 101 is disposed above the pressing support mechanism and can be driven by a pressing drive mechanism such as a cylinder or hydraulic cylinder. The cylinder body of the pressing drive mechanism is fixedly installed on the pressing frame 109. The pressing support mechanism is used to support the mold, and the pressing positioning mechanism is used to fix the position of the mold below the pressure plate 101.

[0071] The pressing bearing mechanism includes a pressing bearing seat 103, a pressing conveying part 104, and a mold locking part disposed on the upper surface of the bearing platform 102. The pressing conveying part 104 can move vertically under the drive of a cylinder or the like installed in the bearing platform 102.

[0072] The pressing and positioning mechanism includes a front limiting part 106 and a side limiting part. The front limiting part 106 can move vertically. When the front limiting part 106 moves to a high position, it can restrict the position of the mold along the conveying direction. The front limiting part 106 can be a blocking cylinder or the like. The side limiting part includes a side fixed limiting plate 107 and a side movable limiting plate 108 respectively placed on both sides of the mold conveying direction. The side movable limiting plate 108 can move along the line connecting the side fixed limiting plate 107 and the side movable limiting plate 108.

[0073] The upper and lower mold separation section 2 includes a separation bearing mechanism, a mold opening mechanism, and an upper mold gripping mechanism. The separation bearing mechanism includes a second processing table 203, the upper surface of which is provided with a separation conveying mechanism 204, a mold opening positioning mechanism, and a lower mold clamping mechanism. The separation conveying mechanism 204 can be an existing conveying device such as a belt conveyor. On both sides of the upper surface of the second processing table 203 in the conveying direction of the separation conveying mechanism 204, elongated separation guide sections 207 are provided, and the ends of the separation guide sections 207 are provided with outwardly extending opening sections 208. The mold opening and positioning mechanism includes a positioning protrusion 205 adapted to the positioning groove on the lower surface of the lower mold. There are at least two positioning protrusions 205. The positioning protrusions 205 can move vertically to insert into the positioning groove, thereby achieving horizontal positioning of the lower mold. The lower mold clamping mechanism includes a lower mold clamping part 206. The lower mold clamping part 206 rotates along the vertical axis under the drive of the rotary drive mechanism 209. The second processing table 203 is provided with a mold opening limiting mechanism 210 on the transmission path of the separation conveying mechanism 204 for accurately positioning the mold at the preset mold opening position. The mold opening limiting mechanism 210 can be a blocking cylinder or the like that that moves vertically.

[0074] The supporting platform 102 is also provided with a core push plate 105 for driving the upper mold pull strip and the lower mold pull strip. The core push plate 105 serves as a mold locking part and moves laterally under the push of a cylinder, hydraulic cylinder, etc., thereby pushing the pull-out part to move towards the mold side. To drive the core push plate 105 and the side movable limiting plate 108 to move, the core push plate 105 and the side movable limiting plate 108 are both installed on the side wall of the transverse driving part 110. The core push plate 105 is located above the side movable limiting plate 108. The side movable limiting plate 108 can contact the lower mold base plate 506, while the core push plate 105 can contact the outer side wall of the pull-out part. The transverse driving part 110 can move laterally. To install the side movable limiting plate 108, the transverse driving part 110 has a sliding groove, and a sliding column is slidably arranged in the sliding groove. The sliding column can slide in the sliding groove. A limiting plate is provided at the end of the sliding column 111 to restrict the sliding column from sliding out of the sliding groove. One end of the sliding column 111 is fixedly connected to the side movable limiting plate 108. An elastic member sleeved on the outside of the sliding column 111 is provided between the side of the side movable limiting plate 108 and the side of the transverse driving part 110. In this embodiment, the elastic member is a spring. The elastic member can make the side movable limiting plate 108 automatically reset, while leaving dimensional redundancy.

[0075] The mold opening mechanism includes an unlocking part 201 for opening the locking mechanism. In this embodiment, an unlocking bracket 211 that can move vertically is provided on one side of the second processing table 203. The unlocking driving mechanism 212 provided on the unlocking bracket 211 drives the unlocking part 201 to move horizontally. In this embodiment, the unlocking part 201 is a plate-shaped structure with a protrusion on the lower surface.

[0076] The upper mold gripping mechanism includes a mold opening lifting part 202 that moves vertically. The mold opening lifting part 202 is provided with a gripping execution unit for gripping the upper mold. The gripping execution unit can be a robotic arm or the like. In this embodiment, the upper mold sleeve plate 401 and the lower mold sleeve plate 501 are both provided with grooves 20 that cooperate with the gripping execution unit. The gripping execution unit includes a gripping part 21 and a gripping drive mechanism 22 for driving the gripping part to move. There are at least two gripping parts 21, which are placed on both sides of the mold. The gripping drive mechanism 22 can be a hydraulic cylinder, an electric push rod, or the like. The piston rod of the gripping drive mechanism 22 moves laterally, so that the gripping part 21 can be engaged in the groove 20.

[0077] The core-pulling section 3 includes a first processing table 301 and a core-pulling plate 302, wherein the first processing table 301 is located below the material-taking section. The upper surface of the first processing table 301 is provided with a mold-receiving conveyor section 305 and a mold-feeding conveyor section 306 with opposite conveying directions. In this embodiment, in a top view, the conveying direction of the mold-receiving conveyor section 305 is perpendicular to the conveying direction of the mold-feeding conveyor section 306. The mold-receiving conveyor section 305 includes conveyor rollers spaced laterally and rotatable around their own axis. At least one conveyor roller is actively rotating. In this embodiment, all conveyor rollers are driven uniformly, such as by a single motor driving all conveyor rollers to rotate synchronously via a sprocket and chain mechanism or a synchronous belt mechanism.

[0078] A material picking limit mechanism 312 is provided at the end of the conveying direction of the mold receiving conveyor section 305. The material picking limit mechanism 312 can be a rigid block fixedly installed on the first processing table 301, or a liftable baffle driven by a cylinder or electric push rod, or a blocking cylinder, etc. Its function is to block and accurately position the mold running to that location, ensuring that it stops at the preset handover position.

[0079] An alignment mechanism is provided on the first processing table 301. The alignment mechanism includes a fixed reference plate 309 fixedly installed on the first processing table 301 and a movable reference plate 310 disposed opposite to it. The upper edges of both the fixed reference plate 309 and the movable reference plate 310 are higher than the upper surface of the conveyor roller, but they do not support the mold; instead, they are located on either side of the mold's travel path. Figure 26 In the indicated state, the fixed reference plate 309 and the movable reference plate 310 are positioned on the left and right sides of the first processing table 301, respectively. The movable reference plate 310 is connected to the output end of the alignment drive mechanism 311, which can be a hydraulic cylinder, an electric push rod, or the like. Driven by the alignment drive mechanism 311, the movable reference plate 310 can move along the axial direction of the conveyor roller, thereby cooperating with the fixed reference plate 309 to clamp and correct the posture of the lower die located between the two.

[0080] The mold feeding conveyor 306 can move vertically. It can employ existing linear conveying mechanisms such as belt conveyors or chain conveyors, and can be driven by hydraulic cylinders or electric push rods. When the mold feeding conveyor 306 is at its low stroke position, its upper surface is lower than the upper surface of the conveyor roller, allowing the mold to be normally conveyed by the conveyor roller without interference. When the mold feeding conveyor 306 is at its high stroke position, its upper surface is higher than the upper surface of the conveyor roller, thus lifting the mold that has stopped on the mold receiving conveyor 305 and disengaging it from the conveyor roller.

[0081] A transition conveyor 307 is provided at the end of the mold feeding conveyor 306 in the conveying direction. This transition conveyor 307 can be a conveying roller arranged axially along the conveyor rollers, with its installation height flush with the upper surface of the mold feeding conveyor 306 when it is in a high position. It is used to receive the mold transferred from the mold feeding conveyor 306 and continue conveying it to the subsequent connecting conveyor mechanism 12; the connecting conveyor mechanism 12 is connected to the feed side of the pressing device 1. The connecting conveyor mechanism 12 optimizes the movement path of the lower mold.

[0082] The first processing table 301 has a mold opening support 303 that can move vertically on one side, and the core pulling drive mechanism 304 on the mold opening support 303 drives the core pulling plate 302 to move horizontally.

[0083] The connecting conveyor mechanism 12 includes a transfer platform 121 and a reversing platform 122. A transfer conveyor mechanism 123 is provided on the upper surface of the transfer platform 121. The transfer conveyor mechanism 123 can be an existing belt conveyor, chain conveyor, etc. The conveying direction of the transfer conveyor mechanism 123 is parallel to the conveying direction of the mold feeding conveyor 306. A lower mold conveyor mechanism 124 and a reversing conveyor mechanism 125 are provided on the upper surface of the reversing platform 122. The lower mold conveyor mechanism 124 is arranged in the same direction as the transfer conveyor mechanism 123, and a stop 126 is provided at the end of the conveying direction of the lower mold conveyor mechanism 124. The stop 126 can be a blocking cylinder, etc. The conveying direction of the reversing conveyor mechanism 125 is parallel to the conveying direction of the mold receiving conveyor 305. The reversing conveyor mechanism 125 can move in the vertical direction. The structure and installation method of the lower mold conveying mechanism 124 can be the same as or similar to the mold receiving conveying part 305; the structure and installation method of the reversing conveying mechanism 125 can be the same as or similar to the mold feeding conveying part 306.

[0084] The pressure-holding and transporting section includes a stacking machine 13 and a lifting mechanism 14 arranged at intervals along the horizontal direction. The stacking machine 13 can be an existing stacking equipment. The loading point of the stacking machine 13 is connected to the discharge point of the pressing equipment 1. The discharge point of the lifting mechanism 14 is connected to the upper and lower mold separation section 2. A mold transfer mechanism is provided between the stacking machine 13 and the lifting mechanism 14.

[0085] The lifting mechanism 14 includes a lifting frame 141, on which symmetrically arranged and synchronously moving transmission chain groups are provided. The conveying direction of the transmission chain groups is vertical. Loading components are provided on the chains 142 of the transmission chain groups. The loading components include loading supports 143 and auxiliary supports 144 spaced apart along the conveying direction of the transmission chain groups. In this embodiment, four chains 142 are symmetrically arranged on the lifting frame 141, belonging to two transmission chain groups, and the installation positions of the four chains 142 are rectangularly distributed. This rectangular distribution corresponds to the contour of the mold, allowing each of the four corners of the mold to be supported by a loading support 143, thereby achieving stable and balanced support for the mold during lifting. When the loading assembly carries the mold, the loading support 143 is located below the auxiliary support 144. The loading support 143 has first rollers 145 spaced vertically along its upper edge, and the auxiliary support 144 has second rollers 146 spaced vertically along its upper edge. Both the first rollers 145 and the second rollers 146 are rotatable. The lifting frame 141 has a guard plate 147 vertically arranged along its upper edge; the guard plate 147 can be L-shaped. The chain 142 drives the loading assembly and the mold to move downwards. The loading support 143 and the auxiliary support 144, fixed to the chain 142, move accordingly. Since the chain 142 is not absolutely rigid, the mold may have a slight tendency to sway laterally under the influence of gravity and starting inertia. At this time, the first roller 145 and the second roller 146 installed on the load support 143 and the auxiliary support 144 contact and roll with the fixed vertical guard plate 147. This effectively constrains and guides the mold using the guard plate 147, tightening the chain between the first roller 145 and the second roller 146, reducing chain swaying and tilting during operation, making transportation more stable, and ensuring accurate positioning of the mold at the corresponding location. It also prevents the end of the load support 143 from tilting downwards. The mold transfer mechanism within the pressure-holding and transportation section, and the mold transfer mechanism connecting the pressing equipment 1 and the upper and lower mold separation section 2, are two spatially and functionally independent mechanisms. For ease of description, the mold transfer mechanism of the pressing equipment 1 and the upper and lower mold separation section 2 is named Mold Transfer Mechanism No. 1, and the one within the pressure-holding and transportation section is Mold Transfer Mechanism No. 2.

[0086] The mold transfer mechanism includes a horizontal frame 9. Two sliding seats 10 are spaced apart on the horizontal frame 9 along the arrangement direction of the pressing equipment and the upper and lower mold separation part 2. The sliding seats 10 can be driven by existing driving mechanisms such as linear modules to slide on the horizontal frame 9. A transition platform 11 is provided below the horizontal frame 9 between the pressing equipment 1 and the upper and lower mold separation part 2. Each sliding seat 10 is provided with a mold opening gripping mechanism. The mold opening gripping mechanism includes a mold opening lifting part 202 that moves in the vertical direction. The mold opening lifting part 202 is provided with a gripping execution unit. In this embodiment, the sliding seat 10 is provided with a vertical driving mechanism 213 for driving the mold opening lifting part 202 to move in the vertical direction.

[0087] The specific working process is as follows: The softened material, processed by steaming, is automatically fed into the cavity of the lower mold 5 located on the reversing table 122, either by an automatic feeding mechanism or manually. At this time, the reversing conveyor 125 is positioned at a low point in its movement path and does not contact the lower mold. Subsequently, the reversing conveyor 125 rises and starts, conveying the lower mold 5 carrying the material to the pressing conveyor section 104 of the pressing equipment 1. The pressing conveyor section 104 conveys the lower mold 5 to the front limit section 106, which rises to block and initially position it. After positioning, the pressing conveyor section 104 descends, allowing the lower mold 5 to be supported by the pressing support seat 103. Next, the side movable limit plate 108 moves laterally towards the mold, pushing the lower mold 5 as a whole towards the side fixed limit plate 107 until the lower mold 5 is securely clamped between the side movable limit plate 108 and the side fixed limit plate 107, thereby completing the precise positioning of the lower mold.

[0088] After the lower mold 5 is positioned, the first mold transfer mechanism places the transferred upper mold 4 onto the lower mold 5, completing the mold closing. Subsequently, the pressure plate 101 of the pressing device 1 moves downward, applying vertical pressure to the upper mold 4. At the same time, the core push plate 105 pushes the pull-out part 8, driving the upper core 403 and lower core 503 to move laterally, applying lateral pressure to the material in the cavity. Under this combined vertical and lateral pressure, the material is pressed and shaped. Meanwhile, the movement of the core push plate 105 drives the movable mounting part 7 of the locking mechanism to move laterally through the upper mold pull-out part, causing the expansion part 702 and the limiting part 602 to engage with each other in the vertical direction, thereby achieving mechanical locking of the upper mold 4 and the lower mold 5, forming an independently movable pressure-holding unit.

[0089] After pressing and locking are completed, the front limit part 106 and the side movable limit plate 108 reset, the pressing conveying part 104 rises again, and the locked mold is moved out of the pressing station and sent to the stacking machine 13 of the pressure holding and transporting part. The stacking machine 13 lifts the mold to the height of docking with the second mold transfer mechanism, and the second mold transfer mechanism transfers it to the carrying component of the lifting mechanism 14. The lifting mechanism 14 vertically transports the mold downward to the station docking with the upper and lower mold separation part 2. During the process of the mold being transferred and staying in the stacking machine 13, the second mold transfer mechanism and the lifting mechanism 14, the pressure holding is completed. At this time, the pressing equipment 1 has been released and can proceed to the next cycle of operation.

[0090] After the pressure holding period, the mold is conveyed to the upper and lower mold separation section 2 by the separation conveying mechanism 204, guided by the separation guide section 207, and finally precisely blocked at the mold opening station by the mold opening limiting mechanism 210. Subsequently, the positioning protrusion 205 rises and inserts into the positioning groove of the lower mold base plate 506 to fix the lower mold 5; at the same time, the lower mold clamping part 206 rotates to the upper mold base plate 506 to constrain the lower mold. Next, the unlocking part 201 first moves laterally to the upper mold pulling part, then descends to insert into the gap, and finally moves laterally away from the upper mold, causing the expansion part 702 of the locking mechanism to disengage from the limiting part 602, completing the unlocking.

[0091] After unlocking, the gripping part 21 on the first mold transfer mechanism extends into the groove 20 of the upper mold sleeve plate 401, and its mold opening lifting part 202 grips and lifts the upper mold 4, realizing the separation of the upper and lower molds. After separation, the positioning protrusion 205 descends, the lower mold clamping part 206 moves away, and the mold opening limiting mechanism 210 resets. Subsequently, the pressing and conveying part 104 outputs the lower mold 5 containing the product and conveys it to the core pulling part 3.

[0092] In the core-pulling section 3, the lower mold 5 is received and conveyed by the mold receiving and conveying section 305 until it is blocked by the material-removing limiting mechanism 312. The alignment drive mechanism 311 drives the movable reference plate 310 to move towards the fixed reference plate 309, pushing the lower mold 5 into position and precisely positioning it at the material-removing station. Subsequently, the lower mold opening bracket 303 drives the core-pulling plate 302 to descend and insert into the gap of the lower mold pulling section. The core-pulling drive mechanism 304 drives the core-pulling plate 302 to move laterally, driving the lower core 503 through the lower mold pulling section to complete the core-pulling process.

[0093] Workers or automated equipment remove the product from the lower mold. After the product is removed, the mold conveying unit 306 rises, lifting the empty lower mold 5 from the mold receiving conveying unit 305 and conveying it laterally to the transition conveying unit 307. Finally, the transition conveying unit 307 transfers the product to the transfer table 121 of the connecting conveying mechanism 12 to start the next round of material filling and pressing cycle.

[0094] The working process of the mold transfer mechanism is as follows: when a sliding seat carries the mold to the middle section of the transverse frame 9 and is directly above the transition platform 11, the mold opening lifting part 202 on it drives the gripping execution unit to descend and place the mold on the transition platform 11. Then the gripping part 21 retracts to release the mold, so that the mold is placed on the transition platform 11 for temporary storage. Then, the sliding seat moves away from the transition platform 11.

[0095] Next, the sliding block moves along the transverse frame 9 to directly above the transition platform 11. The upper mold gripping mechanism on it descends and grips the upper mold 4 temporarily stored there. Then the mold is moved to the processing area.

[0096] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0097] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A preheating and pressing method, characterized in that, Includes the following steps: 1) Soften the material to be pressed; 2) Place the softened material in the lower mold (5), and then drive the upper mold (4) to close with the lower mold (5) so that the material is contained in the cavity formed by the upper mold (4) and the lower mold (5); 3) Apply vertical and lateral forces to the material in the cavity through the pressing equipment (1) to perform pressing and molding; 4) After pressing, the upper mold (4) and the lower mold (5) are locked together by the locking mechanism of the mold itself to maintain pressure; 5) Remove the locked mold from the pressing device (1) to release the pressing device (1) for subsequent operations; 6) After the pressure holding is completed, release the locking state of the locking mechanism, separate the upper mold (4) and the lower mold (5), and then perform core pulling to release the lateral constraint on the molded product; 7) Remove the molded product from the lower mold; The pressing, holding, separation of the upper mold (4) and the lower mold (5), and release of the lateral constraints of the molded product are all completed within the molding system. The molding system includes a pressing device (1), an upper and lower mold separation part (2), a core pulling part (3), and matching molds. The lower mold (5) is transferred between the pressing device (1) and the core pulling part (3) through a connecting conveying mechanism (12). The connecting conveying mechanism (12) is provided with a material placement area. A mold transfer mechanism is provided between the pressing device (1) and the upper and lower mold separation part (2) to realize the transfer of the upper mold. A pressure holding and transport part is provided between the pressing device (1) and the upper and lower mold separation part (2) to realize the transfer of the mold in the pressure holding state.

2. The preheating and pressing method according to claim 1, characterized in that, The mold includes an upper mold (4) and a lower mold (5). The upper mold (4) includes an upper mold plate (401) and an upper mold core (402) fixedly installed on the upper mold plate (401). The lower mold (5) includes a lower mold plate (501) and a lower mold core (502) fixedly installed on the lower mold plate (501). The upper mold (4) and the lower mold (5) are locked together by a locking mechanism provided thereon. The lower mold (5) also includes a lower core (503) that cooperates with the lower mold core (502). The back of the lower core (503) is fixedly connected to the lower mold pull bar (504). 04) It is slidably disposed in the lower mold plate (501); the upper mold (4) also includes an upper core (403) that cooperates with the upper mold core (402), the back of the upper core (403) is fixedly connected to the upper mold pull strip (404), the upper mold pull strip (404) is slidably disposed in the upper mold plate (401); at least one end of the upper mold pull strip (404) extends out of the upper mold plate (401), at least one end of the lower mold pull strip (504) extends out of the lower mold plate (501), and the extended ends of the upper mold pull strip (404) and the lower mold pull strip (504) are respectively fixedly connected with a pull-out part (8).

3. The preheating and pressing method according to claim 2, characterized in that, The locking mechanism includes a fixed part and a movable part. The fixed part includes a fixed mounting part (6) fixedly installed on the upper mold sleeve plate (401) or the lower mold sleeve plate (501). The fixed mounting part (6) is provided with a locking hole (601). A limiting part (602) extending inward is provided on one side of the edge of the locking hole (601). The movable part includes a movable mounting part (7) fixedly installed on the corresponding lower mold pull strip (504) or upper mold pull strip (404). A vertical column (701) is provided on the movable mounting part (7). An expansion part (702) is fixedly provided at the end of the vertical column (701). The outer diameter of the expansion part (702) is larger than the outer diameter of the vertical column (701). Furthermore, the outer diameter of the expansion part (702) is larger than the diameter of the locking hole (601) at the limiting part (602), but smaller than the diameter of other parts of the locking hole (601).

4. The preheating and pressing method according to claim 3, characterized in that, The pressing device (1) includes a pressing bearing mechanism and a pressure plate (101). The pressure plate (101) is located above the pressing bearing mechanism and can move vertically. The pressing bearing mechanism includes a pressing bearing seat (103), a pressing conveying part (104), and a mold locking part located on the upper surface of the bearing platform (102). The pressing conveying part (104) can move vertically. The bearing platform (102) is also provided with a pressing positioning mechanism. The pressing positioning mechanism includes a front limiting part (106) and a side limiting part. The front limiting part (106) can move vertically. When the front limiting part (106) moves to a high position, it can restrict the position of the mold along the conveying direction. The side limiting part includes a side fixed limiting plate (107) and a side movable limiting plate (108) located on both sides of the mold conveying direction. The side movable limiting plate (108) can move along the line connecting the side fixed limiting plate (107) and the side movable limiting plate (108).

5. The preheating and pressing method according to claim 3, characterized in that, The core-pulling section (3) includes a first processing table (301) and a core-pulling plate (302). A mold-opening support (303) that can move vertically is provided on one side of the first processing table (301). A core-pulling driving mechanism (304) provided on the mold-opening support (303) drives the core-pulling plate (302) to move horizontally. A mold-receiving conveying section (305) and a mold-feeding conveying section (306) with opposite conveying directions are provided on the upper surface of the first processing table (301). The mold-receiving conveying section (305) includes conveying rollers that are spaced horizontally and can rotate around their own axis. The mold-feeding conveying section (306) can move vertically. The mold-feeding conveying section (306) has a low position below the upper surface of the conveying rollers and a high position above the upper surface of the conveying rollers in the lifting stroke. The conveying direction of the mold-feeding conveying section (306) is... The end of the first processing table (301) is provided with a transition conveying section (307), which is arranged opposite to the core-pulling plate (302). The conveying direction of the transition conveying section (307) is the same as that of the mold feeding conveying section (306). The mold exit side of the transition conveying section (307) is connected to the connecting conveying mechanism (12). The first processing table (301) is also provided with an alignment mechanism. The alignment mechanism includes a fixed reference plate (309) and a movable reference plate (310) placed on both sides of the conveying direction of the mold receiving conveying section (305). The movable reference plate (310) moves along the line connecting it and the fixed reference plate (309) under the drive of the alignment driving mechanism (311). At the end of the conveying direction of the mold receiving conveying section (305), a material picking limiting mechanism (312) for limiting the mold at the preset material picking station is provided.

6. The preheating and pressing method according to claim 3, characterized in that, The upper and lower mold separation part (2) includes a separation bearing mechanism and a mold opening mechanism. The mold opening mechanism includes an unlocking part (201) for opening the locking mechanism. The separation bearing mechanism includes a second processing table (203). The upper surface of the second processing table (203) is provided with a separation conveying mechanism (204), a mold opening positioning mechanism and a lower mold clamping mechanism. The upper surface of the second processing table (203) is provided with elongated separation guide parts (207) on both sides of the conveying direction of the separation conveying mechanism (204). The end of the separation guide part (207) is provided with an outwardly extending opening section (208). The mold opening positioning mechanism includes a positioning protrusion (205) that matches the positioning groove on the lower surface of the mold lower mold. The number of positioning protrusions (205) is at least two. The positioning protrusions (205) can move vertically to be inserted into the positioning groove, thereby achieving horizontal positioning of the lower mold. The lower mold clamping mechanism includes a lower mold clamping part (206), which rotates along the vertical axis under the drive of the rotary drive mechanism (209). The second processing table (203) is provided with an opening limiting mechanism (210) on the transmission path of the separation conveying mechanism (204). The second processing table (203) is provided with an unlocking bracket (211) that can move vertically on one side. The unlocking drive mechanism (212) provided on the unlocking bracket (211) drives the unlocking part (201) to move horizontally.

7. The preheating and pressing method according to claim 1, characterized in that, The pressure-holding and transporting section includes a stacking machine (13) and a lifting mechanism (14) arranged at intervals along the horizontal direction. The loading point of the stacking machine (13) is connected to the discharge point of the pressing equipment (1), and the discharge point of the lifting mechanism (14) is connected to the upper and lower mold separation section (2). A mold transfer mechanism is provided between the stacking machine (13) and the lifting mechanism (14). The lifting mechanism (14) includes a lifting frame (141), on which a symmetrically arranged and synchronously moving transmission chain group is provided. The conveying direction of the transmission chain group is vertical, and the chain (1) of the transmission chain group is vertical. 42) A loading assembly is provided on the frame. The loading assembly includes a loading support (143) and an auxiliary support (144) spaced apart along the conveying direction of the conveyor chain. A first roller (145) is rotatably mounted on the loading support (143). A second roller (146) is mounted on the auxiliary support (144). A guard plate (147) is vertically mounted on the lifting frame (141). When the first roller (145) and the second roller (146) move to the guard plate (147), the first roller (145) and the second roller (146) abut against the guard plate (147).

8. A preheating and pressing method according to claim 1 or 7, characterized in that, The mold transfer mechanism includes a horizontal frame (9), on which two sliding seats (10) are arranged at intervals along the arrangement direction of the pressing equipment and the upper and lower mold separation part (2). A transition platform (11) is arranged below the horizontal frame (9) between the pressing equipment (1) and the upper and lower mold separation part (2). Each sliding seat (10) is provided with a mold opening gripping mechanism. The mold opening gripping mechanism includes a mold opening lifting part (202) that moves in the vertical direction. A gripping execution unit is provided on the mold opening lifting part (202).

9. The preheating and pressing method according to claim 1, characterized in that, The connecting conveying mechanism (12) includes a transfer platform (121) and a reversing platform (122). The upper surface of the transfer platform (121) is provided with a transfer conveying mechanism (123). The upper surface of the reversing platform (122) is provided with a lower mold conveying mechanism (124) and a reversing conveying mechanism (125). The lower mold conveying mechanism (124) is arranged in the same direction as the transfer conveying mechanism (123), and a stop (126) is provided at the end of the conveying direction of the lower mold conveying mechanism (124). The conveying direction of the reversing conveying mechanism (125) is different from the conveying direction of the lower mold conveying mechanism (124). The reversing conveying mechanism (125) can move in the vertical direction.

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