A far-infrared hot-melt overlapping plastic box assembly device

Abstract

This invention relates to the field of molding and joining equipment for plastic sheets, specifically to a far-infrared hot-melt overlapping plastic box forming device, comprising a frame, a lower pressure mold fixedly connected to the frame, and a pressing mechanism. The pressing mechanism is disposed above the lower pressure mold and can move in a direction perpendicular to the surface of the lower pressure mold to press the joint of the sheet. A first clamping mechanism and a second clamping mechanism are respectively disposed on both sides of the lower pressure mold, which are used to clamp the two sections of the sheet to be joined. This invention, by fixing the first clamping mechanism and rotatably disposing of the second clamping mechanism, uses a rotating shaft to drive the second clamping mechanism to rotate around the axis, so that the sheet held by the second clamping mechanism automatically changes its spatial posture during the rotation, and drives the unconstrained sheet to move synchronously, thereby automatically converting the sheet from the initial enclosed state to a flat enclosed state that is easy for hot-melt pressing.

Description

Technical Field

[0001] This invention relates to the field of molding and joining equipment for plastic sheets, and specifically to a far-infrared hot melt overlapping plastic box forming device. Background Technology

[0002] Hollow plastic sheets are widely used in logistics packaging and turnover boxes due to their excellent properties such as light weight, moisture resistance, and corrosion resistance. These plastic boxes are typically made from a single piece of plastic sheet, cut and stamped to form a creased shape, such as... Figure 8 As shown, the board has four sides. The junctions of the other sides have been automatically formed by stamping and cutting, but two sides, A1 and A2, still need to be joined together after being enclosed.

[0003] In existing technology, the joining of A1 and A2 panels is usually accomplished using a hot-melt pressing method. During operation, the worker needs to manually adjust the panels from a three-dimensional unfolded, enclosed state to a flat, enclosed state, so that the A1 and A2 panels are roughly horizontally aligned with the lower pressing mold. Then, the edges to be joined are inserted into the narrow space below the pressing mechanism for positioning and clamping. This process presents the following problems:

[0004] First, when the boards are enclosed, the space between the boards to be joined is narrow. Workers need to accurately align the two boards and insert them into the clamping mechanism within this small space. The operating space is limited and the line of sight is obstructed. This not only makes the operation cumbersome and labor-intensive, but also makes it difficult to ensure positioning accuracy, and problems such as misalignment of the joining edges and uneven overlap are likely to occur.

[0005] Secondly, since the positioning of the panels to be joined depends entirely on manual experience, the different operating techniques and skill levels of different workers result in poor product consistency, high defect rate, and difficulty in improving production efficiency.

[0006] Furthermore, in the existing device, during the hot melting process, the edges to be joined often directly contact the lower pressure mold, which can easily lead to poor welding due to uneven heat transfer; during pressing, the edges of the two plates are pressed at the same time, lacking buffer transition, resulting in large joint impact and affecting the final joint quality. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a far-infrared hot-melt overlapping plastic box assembly device, which overcomes the deficiencies of existing technologies. It has a reasonable design and compact structure, and solves technical problems such as cumbersome manual operation, inaccurate positioning, and poor joining quality. It realizes automated, precise, and high-quality production of plastic boxes.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A far-infrared hot-melt overlapping plastic box forming device includes a frame, a lower pressing mold table fixedly connected to the frame, and a pressing mechanism. The pressing mechanism is disposed above the lower pressing mold table and can move in a direction perpendicular to the surface of the lower pressing mold table to press the joints of the sheet metal.

[0010] The lower pressing mold table is provided with a first clamping plate mechanism and a second clamping plate mechanism on both sides, and the first clamping plate mechanism and the second clamping plate mechanism are respectively used to clamp the two sections of the plate to be joined.

[0011] The first clamping plate mechanism is fixedly mounted on the frame, and the second clamping plate mechanism is rotatably mounted on the frame via a rotating shaft;

[0012] The first clamping mechanism includes at least a first base plate for supporting the plate below the plate surface. The first base plate is inclined and its side closer to the lower pressing mold is higher. The central axis of the rotating shaft is at the same horizontal height as the lower edge of the first base plate.

[0013] It also includes a driving component, which is used to drive the second clamping mechanism to rotate around the axis of the rotation shaft, so that the lower boundary of the arc trajectory swept by the edge of the plate segment held by the second clamping mechanism during the rotation intersects with the edge of the plate segment held by the first clamping mechanism; and during the rotation of the second clamping mechanism, the unconstrained plate surface of the plate to be joined moves with the plate segment held by the second clamping mechanism.

[0014] Preferably, the driving component includes a linkage block, a main cylinder, a U-shaped frame, and rollers;

[0015] The linkage block has a through groove between its upper and lower surfaces, and its sidewall has a sliding groove that communicates with the through groove.

[0016] The tail end of the main cylinder is pivotally connected to the frame, and the end of its telescopic rod is fixedly connected to the U-shaped frame.

[0017] The roller passes through the slide groove, with its two ends located inside the through groove and outside the linkage block, respectively, and rotates with the two ends of the U-shaped frame. The roller rolls and slides along the slide groove when the main cylinder extends and retracts.

[0018] The second clamping mechanism includes a second base plate, a second fixing frame, a second cylinder, and a second pressure plate;

[0019] The second base plate and the second fixing frame are both fixedly connected to the linkage block. The second fixing frame extends from the side above the linkage block, and its extension direction is parallel to the second base plate.

[0020] The second cylinder is fixedly installed on the second fixed frame, and the second pressure plate is fixedly connected to the telescopic rod of the second cylinder, and can press and fix the plate to the second base plate under the drive of the second cylinder.

[0021] Preferably, the first clamping mechanism further includes a first fixed frame, a first pressure plate arranged parallel to the first base plate, and a first cylinder. The first fixed frame and the first base plate are fixedly connected to the frame, the first cylinder is fixedly connected to the first fixed frame, and the first pressure plate is fixedly connected to the telescopic rod of the first cylinder, and can press and fix the plate to the first base plate under the drive of the first cylinder.

[0022] Preferably, the tilt angle of the first base plate is no higher than 5°.

[0023] Preferably, it further includes a hot-melt mechanism, which is disposed on the same side of the lower pressure mold table as the first clamping plate mechanism; the hot-melt mechanism includes a third fixed frame fixedly connected to the frame, a third cylinder fixedly installed on the third fixed frame, a movable plate fixedly connected to the end of the telescopic rod of the third cylinder, and an infrared heating tube. The movable plate has a groove on one edge facing the part to be joined for accommodating the infrared heating tube. The infrared heating tube is arranged parallel to the edge of the plate to be joined and can move closer to and further away from the part to be joined as the third cylinder extends and retracts.

[0024] Preferably, guide rails are symmetrically fixedly connected to the third fixed frame, and the two side edges of the movable plate are slidably connected to the guide rails.

[0025] Preferably, the movable plate is inclined, and the side containing the groove is lower.

[0026] Preferably, a support plate is fixedly connected below the frame, and the support plate is configured to pre-support an unconstrained surface of the plates to be joined.

[0027] Preferably, the pressing mechanism includes a main fixed frame fixedly connected to the machine frame, a main hydraulic cylinder fixedly connected to the main fixed frame, and an upper pressing die fixedly connected to the end of the telescopic rod of the main hydraulic cylinder. The upper pressing die can press the part of the plate to be joined onto the lower pressing die table as the main hydraulic cylinder extends and retracts.

[0028] Preferably, it further includes an edge positioning mechanism, which includes a fourth fixed frame fixedly connected to the frame, a fourth cylinder fixedly installed on the fourth fixed frame, and an inclined plate fixedly connected to the end of the telescopic rod of the fourth cylinder. The lower end of the inclined plate is bent to form a horizontal section, which extends and retracts with the fourth cylinder and presses against the edge of the plate segment held by the second clamping mechanism at the end of its stroke.

[0029] Preferably, the horizontal section has its side bent upwards to form a vertical section, and the edge of the upper die moves vertically close to the vertical section.

[0030] This invention provides a far-infrared hot-melt overlapping plastic box assembly device. It has the following beneficial effects:

[0031] 1. This invention, by fixing a first clamping mechanism and rotatably configurable a second clamping mechanism, uses a rotating shaft to drive the second clamping mechanism to rotate around an axis. This causes the A2 plate held by the second clamping mechanism to automatically change its spatial orientation during rotation, simultaneously moving the unconstrained A3 and A4 plate surfaces. This automatically transforms the plates from an initial enclosed state to a flat, enclosed state suitable for heat-sealing. In this process, workers only need to roughly place the plates on the pallet and clamping mechanism initially, eliminating the need for precise alignment in a confined space. Subsequent precise positioning is entirely automated by mechanical rotation, significantly reducing operational difficulty and labor intensity, and substantially improving production efficiency.

[0032] 2. This invention precisely controls the rotation angle of the second clamping plate mechanism through a driving component, ensuring that the lower boundary of the arc trajectory swept by the edge of plate A2 during rotation precisely intersects with the edge of plate A1. This transforms the original manual positioning process into a deterministic motion trajectory guaranteed by a mechanical structure. Simultaneously, by defining the angle θ between the second base plate and the first base plate, parameterized and precise control of the rotation endpoint position is achieved. This ensures that the relative height of plates A1 and A2 is consistent before each joining, completely eliminating the positioning uncertainty caused by manual operation and effectively avoiding quality defects such as misalignment and uneven overlap at the joining edges.

[0033] 3. The invention utilizes a slightly inclined structure design on the first base plate, suspending the parts of the plates to be joined above the lower pressure mold during heat melting. This avoids uneven heating caused by heat transfer from the lower pressure mold, ensuring consistent welding quality. Simultaneously, during pressing, the upper pressure mold sequentially contacts the edges of plates A2 and A1, utilizing the elastic deformation of the plates themselves to allow the edges to gradually transition and adhere to the lower pressure mold, avoiding rigid impact and resulting in a smoother, more uniform joint. The edge positioning mechanism vertically presses the A2 plate before heat melting and pressing, ensuring the plates do not shift during pressing, resulting in a high-strength, smooth-surfaced final product. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0035] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention;

[0036] Figure 3This is a schematic diagram of the connection between the first clamping plate mechanism, the hot-melt mechanism, and the frame in this invention;

[0037] Figure 4 This is a schematic diagram of the structure of the second clamping plate mechanism and the plate in this invention;

[0038] Figure 5 for Figure 1 A frontal perspective view of the medium-sized sheet metal in its final flattened, enclosed state;

[0039] Figure 6 for Figure 5 Enlarged view of part B in the middle section;

[0040] Figure 7 This is a front perspective view of the present invention in its initial enclosed state;

[0041] Figure 8 This is a structural diagram of the board material;

[0042] In the picture:

[0043] 1. Frame; 2. Lower pressing mold table; 3. Pressing mechanism; 301. Main fixed frame; 302. Main hydraulic cylinder; 303. Upper pressing mold; 4. First clamping plate mechanism; 401. First fixed frame; 402. First base plate; 403. First pressure plate; 404. First cylinder; 5. Second clamping plate mechanism; 501. Linkage block; 5011. Through groove; 5012. Slide groove; 502. Second base plate; 503. Second fixed frame; 504. Main cylinder; 505 506. U-shaped frame; 507. Roller; 508. Second cylinder; 509. Second pressure plate; 6000. Hot melt mechanism; 601. Third fixed frame; 602. Third cylinder; 603. Movable plate; 6031. Groove; 604. Infrared heating tube; 605. Guide rail; 7. Support plate; 806. Edge positioning mechanism; 801. Fourth fixed frame; 802. Fourth cylinder; 803. Inclined plate; 8031. Horizontal section; 8032. Vertical section; 9. Rotating shaft. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] This invention provides a far-infrared hot-melt overlapping plastic box forming device, mainly used for welding and forming plastic sheets. The plastic sheet is formed from a single piece of plastic through cutting and stamping to create a crease shape. Overall, it has four facets: A1, A2, A3, and A4, where A1 and A3 are opposite each other, and A2 and A4 are opposite each other. The junctions of the other facets are automatically formed through stamping and cutting, while facets A1 and A2 need to be hot-melt joined by this device. The device mainly includes a frame 1, a lower pressure mold 2 fixedly connected to the frame 1, and a pressing mechanism 3. The pressing mechanism 3 is located above the lower pressure mold 2 and can move in a direction perpendicular to the surface of the lower pressure mold 2, used to press and shape the joints of the heated and softened sheet.

[0046] The lower pressure die 2 is provided with a first clamping mechanism 4 and a second clamping mechanism 5 on both sides. The first clamping mechanism 4 is used to clamp one section of the plate surface A1 to be joined, and the second clamping mechanism 5 is used to clamp the other section of the plate surface A2 to be joined.

[0047] Specifically, the first clamping mechanism 4 is fixedly mounted on the frame 1. In a preferred embodiment, such as... Figure 1 and Figure 3 As shown, the first clamping mechanism 4 includes a first fixed frame 401, a first base plate 402, a first pressure plate 403, and a first cylinder 404. The first fixed frame 401 and the first base plate 402 are both directly fixed to the frame 1, with the first base plate 402 serving as the support reference surface for the sheet metal. The first cylinder 404 is fixedly connected to the first fixed frame 401, and the first pressure plate 403 is arranged parallel to the first base plate 402 and fixedly connected to the telescopic rod of the first cylinder 404. When the telescopic rod of the first cylinder 404 extends, the first pressure plate 403 presses and fixes the edge of the A1 surface of the sheet metal onto the first base plate 402.

[0048] Please see Figure 5 , 6The first base plate 402 is preferably inclined, with the side closer to the lower pressure mold 2 being higher, and its inclination angle α with the horizontal plane not exceeding 5°, preferably set to 3°. This slightly inclined design has multiple functions: First, when the worker places the sheet material on the first base plate 402, the part of the sheet material above the lower pressure mold 2 will be slightly raised, avoiding scratching with the lower pressure mold 2 during insertion, facilitating the loading operation; Second, during the subsequent hot melting process, the part of the sheet material to be joined is suspended above the lower pressure mold 2 due to the inclination, and does not directly contact the lower pressure mold 2, which can effectively prevent uneven heating of the joined part caused by heat transfer from the lower pressure mold 2; Third, during pressing, the upper pressure mold 303 will first contact the edge of the A2 sheet surface during the pressing process, and then press down the edges of the A2 and A1 sheets surface in sequence. Since the sheet material itself has a certain elastic deformation capacity, the raised part will be bent and gradually adhere to the lower pressure mold 2, so that a slow transition contact process is formed between the edges of the two sheets surface, and the joint is more gentle and uniform.

[0049] Please see Figure 4-6 The second clamping mechanism 5 is rotatably mounted on the frame 1 via a rotating shaft 9, one end of which is fixedly connected to the frame 1. This mechanism is used to clamp the other section A2 of the sheet metal. Figure 4 As shown, the driving component includes a linkage block 501, a main cylinder 504, a U-shaped frame 505, and rollers 506; the second clamping mechanism 5 includes a second base plate 502, a second fixing frame 503, a second cylinder 507, and a second pressure plate 508. The linkage block 501 has a through groove 5011 between its upper and lower surfaces, and a sliding groove 5012 communicating with the through groove 5011 is formed on its side wall. The tail end of the main cylinder 504 is pivotally connected to the frame 1, and the end of its telescopic rod is fixedly connected to the U-shaped frame 505. The rollers 506 pass through the sliding groove 5012, with their two ends located inside the through groove 5011 and outside the linkage block 501, respectively, and rotatably engaged with the two ends of the U-shaped frame 505. The second base plate 502 and the second fixing frame 503 are both fixedly connected to the linkage block 501. The second fixing frame 503 extends from the upper side of the linkage block 501, and its extension direction is parallel to the second base plate 502. The second cylinder 507 is fixedly installed on the second fixed frame 503, and the second pressure plate 508 is fixedly connected to the telescopic rod of the second cylinder 507, which is used to press and fix the plate to the second base plate 502.

[0050] With the above structure, when the main cylinder 504 extends or retracts, its extension rod pushes the U-shaped frame 505 to move, thereby causing the roller 506 to roll in the slide groove 5012 and slide along the slide groove 5012, thus driving the linkage block 501 and its components such as the second base plate 502 and the second fixed frame 503 to rotate together around the axis of the rotation shaft 9. This process allows the lower boundary of the arc trajectory swept by the edge of the A2 plate held by the second clamping mechanism 5 during rotation to intersect with the edge of the A1 plate held by the first clamping mechanism 4, achieving preliminary alignment of the two edges to be joined. At the same time, during this rotation, the unconstrained plate surfaces A3 and A4 of the plates to be joined will move together with the A2 plate surface held by the second clamping mechanism 5, thereby achieving the following... Figure 7 The initial enclosed state shown transforms into the following: Figure 5 The flat, enclosed shape shown facilitates pressing.

[0051] As a preferred embodiment, such as Figure 5 As shown, when the second base plate 502 rotates upward to the forming end, the included angle θ between the second base plate 502 and the first base plate 402 is not less than 160° and less than 180°. Under the condition that the structure allows, the larger this included angle θ is, the better, so that the surfaces of plates A1 and A2 are closer to a coplanar state at the end of the rotation, thereby reducing the elastic deformation required in the subsequent pressing process and improving the bonding quality. Meanwhile, as... Figure 5 As shown by the horizontal dashed line, the central axis of the rotating shaft 9 is set at the same horizontal height as the lower edge of the first base plate 402 (i.e. the side away from the lower pressure mold table 2), which further ensures the precise alignment of the two edges to be joined at the end of the rotation.

[0052] When the second clamping mechanism 5 rotates until the A2 plate surface it holds and the A1 plate surface held by the first clamping mechanism 4 form a flat, enclosed state that facilitates pressing, the main cylinder 504 stops. At this time, since the lower pressing platform 2 is located inside the enclosed shape, the A1 and A2 plate surfaces are not completely horizontal, but rather at a slight angle. The edges to be joined on both plates are located above the lower pressing platform 2 and close to each other. During the subsequent pressing process, the plates rely on their own elastic deformation ability to allow the edges to bend elastically and fit tightly against the surface of the lower pressing platform 2, thereby achieving a good welding effect.

[0053] This device also includes a heat-melting mechanism 6. For example... Figure 3 , 5As shown, the hot-melt mechanism 6 and the first clamping plate mechanism 4 are located on the same side of the lower pressing mold table 2. The hot-melt mechanism 6 includes a third fixed frame 601 fixedly connected to the frame 1, a third cylinder 602 fixedly installed on the third fixed frame 601, a movable plate 603 fixedly connected to the end of the telescopic rod of the third cylinder 602, and an infrared heating tube 604. The infrared heating tube 604 used in this invention is preferably a far-infrared carbon fiber heating tube with an operating voltage of 380V, an outer diameter of 10-15mm, and an effective heating length of not less than 600mm, covering the joint positions of the plate surfaces A1 and A2. A groove 6031 for accommodating the infrared heating tube 604 is opened on the edge of the movable plate 603 facing the joint portion, and the infrared heating tube 604 is arranged parallel to the joint edge of the plate. When the third cylinder 602 extends and retracts, it can drive the movable plate 603 and the infrared heating tube 604 closer to or further away from the joint portion of the plate. To ensure smooth movement, guide rails 605 are symmetrically fixedly connected to the third fixed frame 601, and the two side edges of the movable plate 603 are slidably connected within the guide rails 605. In addition, the movable plate 603 is preferably inclined, and the side where the groove 6031 is located is lower, which helps the infrared heating tube 604 to concentrate heat on the edges to be joined when heating.

[0054] To facilitate material loading by workers, a pallet 7 is fixedly connected to the bottom of the frame 1. During initial loading, the second clamping mechanism 5 is in its initial rotation position driven by the main cylinder 504. In the initial position, its clamping surface is at a right angle or obtuse angle relative to the horizontal plane. The worker first places the sheet material on the pallet 7, using the pallet 7 to provide pre-support. Then, based on the positions of the first clamping mechanism 4 and the second clamping mechanism 5, the worker appropriately adjusts the angles of the A1 and A2 sheet surfaces to align them with the first base plate 402 and the second base plate 502, respectively. After adjustment, the sheet material is pushed inward, so that the A1 sheet surface is placed on the first base plate 402, the A2 sheet surface is placed on the second base plate 502, and the unclamped sheet surface A3 is naturally supported by the pallet 7. The entire loading process is made more convenient by the auxiliary support of the pallet 7, eliminating the need for the worker to hold the entire sheet material for alignment, thus reducing the difficulty of operation.

[0055] Please see Figure 2 , 5 The pressing mechanism 3 includes a main fixing frame 301 fixedly connected to the frame 1, a main hydraulic cylinder 302 fixedly connected to the main fixing frame 301, and an upper pressing mold 303 fixedly connected to the end of the telescopic rod of the main hydraulic cylinder 302. When the edge of the sheet is softened by heat melting, the main hydraulic cylinder 302 drives the upper pressing mold 303 to press down, pressing the part of the sheet to be joined onto the lower pressing mold 2, thus completing the welding and forming.

[0056] To accurately position the A2 plate held by the second clamping mechanism 5 before pressing, and to prevent displacement due to heat or force during hot melting and pressing, this device preferably also includes an edge positioning mechanism 8. Figure 5 , 6 As shown, the edge positioning mechanism 8 includes a fourth fixed frame 801 fixedly connected to the frame 1, a fourth cylinder 802 fixedly installed on the fourth fixed frame 801, and an inclined plate 803 fixedly connected to the end of the telescopic rod of the fourth cylinder 802. The lower end of the inclined plate 803 is bent to form a horizontal section 8031. When the telescopic rod of the fourth cylinder 802 extends to the end of its stroke, the horizontal section 8031 ​​presses against the edge of the plate segment A2 held by the second clamping mechanism 5, achieving vertical positioning. Furthermore, the side of the horizontal section 8031 ​​is bent upward to form a vertical section 8032. When the edge of the upper die 303 moves up and down, it is close to the vertical section 8032, thus also playing a guiding and limiting role in the horizontal direction, ensuring pressing accuracy.

[0057] The far-infrared hot-melt overlapping plastic box forming device proposed in this invention includes multiple stages in its overall working process:

[0058] 1. Initial loading stage: The first cylinder 404 of the first clamping mechanism 4 and the second cylinder 507 of the second clamping mechanism 5 are both in the retracted state, and the first pressure plate 403 and the second pressure plate 508 are respectively away from the first base plate 402 and the second base plate 502. The main hydraulic cylinder 302 of the pressing mechanism 3 retracts, and the upper pressure mold 303 is in a high position. The third cylinder 602 of the hot melt mechanism 6 retracts, and the infrared heating tube 604 is away from the lower pressure mold table 2. The fourth cylinder 802 of the edge positioning mechanism 8 retracts. At this time, the second clamping mechanism 5 is in the initial rotation position under the drive of the main cylinder 504. The worker places the plastic box panels to be joined onto the pallet 7, using the pallet 7 for pre-support. Then, the angles of the A1 and A2 panels are adjusted to align with the first base plate 402 and the second base plate 502, respectively. The panels are then pushed inwards, placing the A1 panel on the first base plate 402 and the A2 panel on the second base plate 502. The unclamped panel A3 rests naturally on the pallet 7. Subsequently, the first cylinder 404 and the second cylinder 507 drive the first pressure plate 403 and the second pressure plate 508 to extend, firmly fixing the A1 and A2 panels. During this process, because the first fixing frame 401 and the first base plate 402 are directly fixed to the frame 1, the structure is more stable, providing precise and stable reference support for the panels. At this time, the panels are in a position as follows: Figure 7 The enclosed state shown is an unfolded arrangement.

[0059] 2. Posture Adjustment Stage: The main cylinder 504 extends, its telescopic rod pushing the U-shaped frame 505. The U-shaped frame 505 drives the roller 506 to move within the slide groove 5012, thereby driving the linkage block 501 to rotate clockwise around the axis of the rotating shaft 9. During this process, the A2 plate surface held by the second clamping plate mechanism 5 and the A3 plate surface connected to it rotate accordingly. Simultaneously, the A4 plate surface connected to the A3 plate surface also moves due to the linkage of the plates. Figure 5 As shown, when the second clamping plate mechanism 5 rotates until the A2 plate surface it clamps and the A1 plate surface clamped by the first clamping plate mechanism 4 form a flat, enclosed state that facilitates pressing, the main cylinder 504 stops. At this time, since the lower pressing mold 2 is located inside the enclosed shape, the A1 and A2 plate surfaces are not completely horizontal, but rather at a slight angle. The edges to be joined on both plates are located above the lower pressing mold 2 and close to each other. At the same time, the angle θ between the second base plate 502 and the first base plate 402 reaches the preset maximum value.

[0060] 3. Hot Melting Stage: The fourth cylinder 802 of the edge positioning mechanism 8 extends, and the horizontal section 8031 ​​at the lower end of the inclined plate 803 moves downward, pressing against the upper surface edge of the A2 board for final positioning. Subsequently, the third cylinder 602 of the hot melting mechanism 6 extends, driving the movable plate 603 to move along the guide rail 605, causing the infrared heating tube 604 installed in the groove 6031 to move between or directly above the edges of A1 and A2 to be joined. The infrared heating tube 604 is energized to heat and soften the edge of the board. After a predetermined heating time of approximately 10 seconds, the infrared heating tube 604 is de-energized, the third cylinder 602 retracts, and the infrared heating tube 604 is removed.

[0061] 4. Pressing and Shaping Stage: The main hydraulic cylinder 302 of the pressing mechanism 3 extends, driving the upper pressing mold 303 to move downwards. During the movement, the upper pressing mold 303 first contacts the edge of the A2 plate, and then presses down the edges of the A2 and A1 plates in sequence. Due to the elastic deformation capacity of the plates themselves, the part that was slightly raised due to the inclination of the first base plate 402 is bent and gradually adheres to the lower pressing mold 2, resulting in a slow transition contact process between the edges of the two plates. The upper pressing mold 303 maintains pressure for a certain period of time until cooling and shaping.

[0062] 5. Reset Stage: After pressing is completed, the main hydraulic cylinder 302 retracts, and the upper mold 303 rises to reset. The fourth cylinder 802 of the edge positioning mechanism 8 retracts, and the horizontal section 8031 ​​releases its pressure on the A2 plate surface. The main cylinder 504 of the second clamping mechanism 5 retracts, driving the linkage block 501 to rotate in the opposite direction, so that the second clamping mechanism 5 resets to its initial tilted state. Finally, the first cylinder 404 and the second cylinder 507 of the first clamping mechanism 4 and the second clamping mechanism 5 retract respectively, releasing the formed plastic box, and the worker can then remove the finished product.

[0063] This invention fixes the first clamping mechanism 4 and rotatably mounts the second clamping mechanism 5. A driving component drives the second clamping mechanism 5 to rotate around the axis of rotation 9. During this rotation, the A2 plate held by the second clamping mechanism 5 automatically changes its spatial orientation, simultaneously moving the unconstrained A3 and A4 plates. This automatically transforms the plates from an initial enclosed state to a flat, enclosed state suitable for heat-sealing. In this process, workers only need to roughly place the plates on the support plate 7 and clamping mechanism initially, without needing to perform precise alignment in a confined space. The subsequent precise positioning is entirely automated by mechanical rotation, significantly reducing operational difficulty and labor intensity, and substantially improving production efficiency.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A far-infrared hot-melt overlapping plastic box forming device, comprising a frame, a lower pressing mold table fixedly connected to the frame, and a pressing mechanism, wherein the pressing mechanism is disposed above the lower pressing mold table and is capable of moving in a direction perpendicular to the surface of the lower pressing mold table to press the joint of the sheet metal, characterized in that, The lower pressing mold table is provided with a first clamping plate mechanism and a second clamping plate mechanism on both sides, and the first clamping plate mechanism and the second clamping plate mechanism are respectively used to clamp the two sections of the plate to be joined. The first clamping plate mechanism is fixedly mounted on the frame, and the second clamping plate mechanism is rotatably mounted on the frame via a rotating shaft; The first clamping mechanism includes at least a first base plate for supporting the plate below the plate surface. The first base plate is inclined and its side closer to the lower pressing mold is higher. The central axis of the rotating shaft is at the same horizontal height as the lower edge of the first base plate. It also includes a driving component, which is used to drive the second clamping plate mechanism to rotate around the axis of the rotation shaft, so that the lower boundary of the arc trajectory swept by the edge of the plate segment held by the second clamping plate mechanism during the rotation intersects with the edge of the plate segment held by the first clamping plate mechanism; and during the rotation of the second clamping plate mechanism, the unconstrained plate surface of the plate to be joined moves with the plate segment held by the second clamping plate mechanism. The driving component includes a linkage block, a main cylinder, a U-shaped frame, and rollers; The linkage block has a through groove between its upper and lower surfaces, and its sidewall has a sliding groove that communicates with the through groove. The tail end of the main cylinder is pivotally connected to the frame, and the end of its telescopic rod is fixedly connected to the U-shaped frame. The roller passes through the slide groove, with its two ends located inside the through groove and outside the linkage block, respectively, and rotates with the two ends of the U-shaped frame. The roller rolls and slides along the slide groove when the main cylinder extends and retracts.

2. The far-infrared hot-melt overlapping plastic box forming device as described in claim 1, characterized in that, The second clamping mechanism includes a second base plate, a second fixing frame, a second cylinder, and a second pressure plate; The second base plate and the second fixing frame are both fixedly connected to the linkage block. The second fixing frame extends from the side above the linkage block, and its extension direction is parallel to the second base plate. The second cylinder is fixedly installed on the second fixed frame, and the second pressure plate is fixedly connected to the telescopic rod of the second cylinder, and can press and fix the plate to the second base plate under the drive of the second cylinder.

3. The far-infrared hot-melt overlapping plastic box forming device as described in claim 1, characterized in that, The first clamping mechanism further includes a first fixed frame, a first pressure plate arranged parallel to the first base plate, and a first cylinder. The first fixed frame and the first base plate are fixedly connected to the frame. The first cylinder is fixedly connected to the first fixed frame. The first pressure plate is fixedly connected to the telescopic rod of the first cylinder and can press and fix the plate against the first base plate under the drive of the first cylinder.

4. The far-infrared hot-melt overlapping plastic box forming device as described in claim 1, characterized in that, The tilt angle of the first base plate is no higher than 5°.

5. A far-infrared hot-melt overlapping plastic box forming device as described in any one of claims 1-4, characterized in that, It also includes a hot-melt mechanism, which is located on the same side of the lower pressure mold table as the first clamping plate mechanism. The hot-melt mechanism includes a third fixed frame fixedly connected to the frame, a third cylinder fixedly installed on the third fixed frame, a movable plate fixedly connected to the end of the telescopic rod of the third cylinder, and an infrared heating tube. The movable plate has a groove on one edge facing the part to be joined to accommodate the infrared heating tube. The infrared heating tube is arranged parallel to the edge of the plate to be joined and can move closer to and further away from the part to be joined as the third cylinder extends and retracts.

6. The far-infrared hot-melt overlapping plastic box forming device as described in claim 5, characterized in that, The third fixed frame is symmetrically fixed with guide rails, and the two sides of the movable plate are slidably connected to the guide rails.

7. The far-infrared hot-melt overlapping plastic box forming device as described in claim 5, characterized in that, The movable plate is inclined, and the side containing the groove is lower.

8. The far-infrared hot-melt overlapping plastic box forming device as described in claim 1, characterized in that, A support plate is fixedly connected to the bottom of the frame, and the support plate is configured to pre-support an unconstrained plate surface of the plates to be joined.

9. The far-infrared hot-melt overlapping plastic box forming device as described in claim 1, characterized in that, The pressing mechanism includes a main fixed frame fixedly connected to the frame, a main hydraulic cylinder fixedly connected to the main fixed frame, and an upper pressing die fixedly connected to the end of the telescopic rod of the main hydraulic cylinder. The upper pressing die can press the part of the plate to be joined onto the lower pressing die table as the main hydraulic cylinder extends and retracts.

10. The far-infrared hot-melt overlapping plastic box forming device as described in claim 9, characterized in that, It also includes an edge positioning mechanism, which includes a fourth fixed frame fixedly connected to the frame, a fourth cylinder fixedly installed on the fourth fixed frame, and an inclined plate fixedly connected to the end of the telescopic rod of the fourth cylinder. The lower end of the inclined plate is bent to form a horizontal section. The horizontal section extends and retracts with the fourth cylinder and presses against the edge of the plate segment held by the second clamping plate mechanism at the end of its stroke.

11. The far-infrared hot-melt overlapping plastic box forming device as described in claim 10, characterized in that, The horizontal section bends upward to form a vertical section, and the edge of the upper die moves vertically close to the vertical section.

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