Multi-layer hot press device

Abstract

A multi-layer hot pressing device includes a base, a lifting seat, an upper heating plate, multiple lower heating plates, multiple trays, and a dragging mechanism. The multiple lower heating plates are positioned between the base and the upper heating plate and arranged vertically. The lifting seat drives the multiple lower heating plates to move vertically to a first position and a second position. A support assembly is provided on the top of the base, comprising multiple support units corresponding one-to-one with the lower heating plates. Each support unit includes two support portions located on either side of the lower heating plate. When the lower heating plate is in the first position, the support portions are higher than the upper surface of the lower heating plate; when the lower heating plate is in the second position, the support portions are lower than the upper surface of the lower heating plate. The dragging mechanism drives the multiple trays to move back and forth, so that when the multiple lower heating plates are in the first position, the multiple trays slide along the multiple support units and are placed above the multiple lower heating plates. This invention can simultaneously hot press multiple workpieces, improving the pressing quality of the workpieces, reducing equipment maintenance costs, and increasing production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hot extrusion processing technology, specifically to a multi-layer hot pressing device. Background Technology

[0002] Hot extrusion equipment is a commonly used processing device that heats workpieces to a certain temperature and then extrudes them. To improve the hot extrusion efficiency of workpieces, multi-layer hot extrusion presses are widely used in hot extrusion processing of workpieces, especially for hot extrusion of metal workpieces. Current multi-layer metal hot extrusion equipment typically includes an upper heating plate, multiple lower heating plates, and multiple trays. The multiple lower heating plates are stacked below the upper heating plate, and the multiple trays correspond one-to-one with the multiple lower heating plates. Multiple metal workpieces to be extruded are placed on the multiple trays respectively. The trays are pushed onto the lower heating plates corresponding to the trays by a dragging mechanism. Finally, the upper heating plate and the multiple lower heating plates are closed, and the metal workpieces on all the trays are extruded simultaneously. The dragging mechanism places the metal workpiece with a tray from the edge of the lower heating plate onto the upper heating plate. The bottom surface of the tray comes into frictional contact with the upper surface of the upper heating plate. After working for a long time, the tray will cause a certain degree of wear on the upper surface of the lower heating plate, resulting in a reduction in the flatness of the upper surface of the lower heating plate. This affects the pressing quality of the metal workpiece, causing uneven material pressing and making it easy to form defects such as bubbles and voids inside the pressed metal workpiece. Utility Model Content

[0003] The main purpose of this invention is to propose a multi-layer hot pressing device to solve the problem of wear on the lower heating plate caused by long-term use of existing multi-layer hot pressing devices, thereby improving the hot pressing quality of the workpiece.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The multi-layer hot press device includes a base, a lifting seat, an upper heating plate, multiple lower heating plates, multiple trays, and a dragging mechanism;

[0006] The upper heating plate is located above the base, and multiple lower heating plates are placed between the base and the upper heating plate and arranged in the vertical direction. Each lower heating plate has a degree of freedom of movement relative to the base in the vertical direction.

[0007] The lifting seat is installed on the base and is used to drive multiple lower heating plates to move in the vertical direction at the first and second positions. When the multiple lower heating plates are in the first position, the two adjacent lower heating plates are separated and the top lower heating plate is separated from the top heating plate. When the multiple lower heating plates are in the second position, the two adjacent lower heating plates are closed and the top lower heating plate is closed.

[0008] The base is provided with a support assembly on top. The support assembly includes multiple support units that correspond one-to-one with multiple lower heating plates. Each support unit includes two support parts located on both sides of the lower heating plate. When the lower heating plate is in the first position, the support parts are higher than the upper surface of the lower heating plate. When the lower heating plate is in the second position, the support parts are lower than the upper surface of the lower heating plate.

[0009] The dragging mechanism is used to move multiple trays back and forth, so that when the multiple lower heating plates are in the first position, the multiple trays slide along the multiple support units and are placed on top of the multiple lower heating plates respectively.

[0010] Preferably, the support assembly includes two brackets located on both sides of the plurality of lower heating plates. The support portion is disposed on the brackets and extends in the front-to-back direction. A linear guide pair is disposed on the base. Both brackets are mounted on the linear guide pair so that the brackets can move relative to the base in the left-to-right direction.

[0011] Preferably, the bracket includes multiple mounting plates arranged in a vertical direction, connecting columns that fix the multiple mounting plates together, and a support portion disposed on the mounting plates.

[0012] Preferably, the mounting plate is pivotally connected to a plurality of rollers arranged in the front-to-back direction, and the tops of the plurality of rollers together form a support portion.

[0013] Preferably, the mounting plate is provided with a connecting seat, which includes a fixing plate fixed to the mounting plate, a connecting plate bent upward from the inner side of the fixing plate, and multiple rollers detachably mounted on the connecting plate by bolts passing through the connecting plate.

[0014] Preferably, the mounting plate is provided with a rigid support strip extending in the front-rear direction, the top of the rigid support strip forms a support part, and the rigid support strip is fixed to the mounting plate in a detachable manner.

[0015] Preferably, a recess is provided on each side of the lower heating plate to avoid the two supports. The distance between the inner end faces of the two recesses is D1, and the width of the tray is D2, where D1 < D2, so that when the tray is above the lower heating plate, its two sides protrude from the sides of the lower heating plate. The portions of the tray that protrude from the sides of the lower heating plate are supported by the two support parts of the support unit.

[0016] Preferably, the base is provided with a storage groove extending downward from its top, and the lifting seat is embedded in the storage groove. The cross-section of the storage groove is the same as the cross-sectional shape of the lifting seat so as to guide the up and down movement of the lifting seat through the storage groove. The upper heating plate is fixedly engaged with the base, and the top of the lifting seat is fixedly connected to the bottom of the lower heating plate.

[0017] Preferably, the top of the base is provided with multiple upwardly extending fixing posts, the tops of which are fixedly connected to the upper heating plate. The lower heating plate is provided with through holes for the fixing posts to pass through. The fixing posts are provided with multiple limiting flanges, which are respectively provided below the multiple lower heating plates. When the lower heating plate is in the first position, the limiting flange abuts against the lower surface of the corresponding lower heating plate.

[0018] Preferably, it also includes a carrier return line mechanism, which has a loading station and a base located at the loading station. A towing mechanism drives the pallet to move back and forth so that the pallet can move between the loading station and the base.

[0019] This utility model's multi-layer hot pressing device can simultaneously hot press multiple workpieces. During the process of feeding and removing workpieces into and from the hot pressing device using a tray, the tray is supported by a support assembly. As the tray moves back and forth, it does not come into contact with the surface of the lower heating plate located below it, thus preventing wear on the lower heating plate. This ensures a high degree of flatness on the upper surface of the lower heating plate, improving the pressing quality of the workpieces and avoiding uneven pressing, air bubbles, voids, and other abnormalities. Furthermore, since the lower heating plate is protected by the support assembly, frequent replacement of the lower heating plate is unnecessary, extending the equipment maintenance cycle, reducing equipment maintenance costs, improving production efficiency, and preventing debris generated from friction between the tray and the lower heating plate from affecting the pressing environment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is an installation diagram of the present invention;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure of the central support component;

[0024] Figure 4 for Figure 1 AA section view;

[0025] Figure 5 for Figure 4 Enlarged view at point B;

[0026] Figure 6 This is a schematic diagram of the material feeding state of this utility model;

[0027] Figure 7 for Figure 6 CC section view;

[0028] Figure 8-9 This is a schematic diagram of the pressing process of this utility model.

[0029] The components are as follows: 10. Base; 11. Fixed column; 111. Limiting flange; 20. Lifting seat; 30. Upper heating plate; 40. Lower heating plate; 41. Connecting block; 42. Through hole; 43. Recess; 50. Tray; 60. Support assembly; 61. Bracket; 611. Mounting plate; 612. Connecting column; 62. Connecting seat; 621. Fixed plate; 622. Connecting plate; 63. Roller; 70. Linear guide pair; 71. Guide rail; 72. Slider.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0034] like Figure 1 , 2As shown in Figures 3, 4, and 5, this utility model provides a multi-layer hot pressing device, particularly a multi-layer hot pressing device suitable for metal workpieces. It includes a base 10, a lifting seat 20, an upper heating plate 30, multiple lower heating plates 40, multiple trays 50, and a dragging mechanism (not shown in the figure). The base 10 is the foundation of the entire device. The top of the base 10 is a plane. The upper heating plate 30 is located above the base 10 and is spaced a certain distance from the top of the base 10. Multiple lower heating plates 40 are arranged between the top of the base 10 and the upper heating plate 30, and the multiple lower heating plates 40 are arranged in the vertical direction. Each lower heating plate 40 has a degree of freedom of movement in the vertical direction, that is, the lower heating plate 40 can move relative to the base 10 in the vertical direction. The lifting seat 20 is installed on the base 10. The lifting seat 20 drives multiple lower heating plates 40 to move vertically relative to the base 10, causing the multiple lower heating plates 40 to move between a first low position and a second high position. When the multiple lower heating plates 40 are in the first position, adjacent lower heating plates 40 are separated from each other, and the topmost lower heating plate 40 is separated from the upper heating plate 30. That is, in the first position, the multiple lower heating plates 40 and the upper heating plate 30 are arranged in the height direction, and are all spaced a relatively large distance from each other, so that... The tray 50 containing the metal workpiece can enter between adjacent lower heating plates 40, and between the lower heating plate 40 and the upper heating plate 30. When the multiple lower heating plates 40 are in the second position, the two adjacent lower heating plates 40 are in a closed state, and the topmost lower heating plate 40 and the upper heating plate 30 are in a closed state. That is, in the second position, the multiple lower heating plates 40 and the upper heating plate 30 are spaced apart by a relatively small gap, so as to perform thermal extrusion on the metal workpieces located between adjacent lower heating plates 40 and the metal workpieces located between the lower heating plates 40 and the upper heating plate 30. A support assembly 60 is provided on the top of the base 10. The support assembly 60 includes support units that correspond one-to-one with a plurality of lower heating plates 40. Each support unit includes two support parts located on both sides of the lower heating plate 40. When the lower heating plate 40 is in the first position, the support parts on the support unit are higher than the upper surface of the lower heating plate 40. That is, the two support parts of the support unit are located above the left and right sides of the lower heating plate 40 respectively. When the lower heating plate 40 is in the second position, the support parts are lower than the upper surface of the lower heating plate 40.The dragging mechanism is used to move the tray 50 back and forth, so that the tray 50 can enter from front to back between two adjacent lower heating plates 40, and between the lower heating plate 40 and the upper heating plate 30. When the dragging mechanism pushes the tray 50 from front to back, the multiple lower heating plates 40 are in the first position, and the two sides of the tray 50 are supported by the support parts, so that the tray 50 slides along the support unit and is placed above the lower heating plates 40. The multiple trays 50 are pushed by the dragging mechanism at the same time, so that the multiple trays 50 move from front to back along the multiple support units and are placed above the multiple lower heating plates 40 respectively.

[0035] In a preferred embodiment, the support assembly 60 includes two brackets 61, which are located on the left and right sides of the plurality of lower heating plates 40, respectively. The brackets 61 are mounted on the base 10. The support portions on the support assembly 60 located on the same side of the plurality of lower heating plates 40 are all set on the corresponding side brackets 61, and the support portions extend in the front-to-back direction so that when the support portions support the side of the tray 50, the tray 50 can move smoothly from front to back. A linear guide pair 70 is provided on the base 10, and the two brackets 61 are both mounted on the linear guide pair 70, so that the brackets 61 can move relative to the base 10 in the left-to-right direction. Specifically, linear guide pairs 70 are provided on both sides of the plurality of lower heating plates 40 on the base 10. The linear guide pair 70 includes a guide rail 71 and a slider 72. The bottom of the two brackets 61 is fixedly connected to the slider 72 of the linear guide pair 70 located on both sides. The bracket 61 includes multiple mounting plates 611 arranged in the vertical direction and a connecting column 612 that fixes the multiple mounting plates 611 together. Multiple support parts arranged in the vertical direction are correspondingly provided on the multiple mounting plates 611. Multiple rollers 63 arranged in the front-back direction are pivotally connected to the mounting plates 611. The tops of the multiple rollers 63 together form a support part extending in the front-back direction.

[0036] When the multi-layer hot pressing device of this utility model is working, Figure 6 , 7 The diagram illustrates the loading state of this invention. Two supports 61 are moved inward along the linear guide 70 to positions close to the multiple lower heating plates 40. The lifting seat 20 is in a lower position. At this time, the multiple lower heating plates 40 are in the first position, meaning the upper surface of the lower heating plate 40 is lower than the top of its corresponding roller 63. The tray 50 containing the metal workpiece is moved from front to back above the front end of the lower heating plates 40 via a dragging mechanism. The two sides of the tray 50 are supported by two sets of rollers 63 on both sides of the support assembly 60, causing the tray 50 to roll along the rollers 63 from front to back. Finally, the multiple trays 50 are moved one by one above the multiple lower heating plates 40, as shown in the diagram. Figure 4 The state shown; then as Figure 8As shown, the two brackets 61 are moved outward along the linear guide pair 70 to a position away from the multiple lower heating plates 40, and the tray 50 is detached from the support assembly 60, so that the tray 50 falls on the upper surface of the lower heating plate 40; finally, as... Figure 9 As shown, the lifting seat 20 moves upward, first lifting the bottommost lower heating plate 40. After rising to a certain height, the bottommost lower heating plate 40 closes with the lower heating plate 40 above it. Thus, as the lifting seat 20 continues to rise, multiple lower heating plates 40 rise with it until the lifting seat 20 reaches its highest position, causing the topmost lower heating plate 40 to close with the upper heating plate 30, pressing the metal workpieces on multiple trays 50. During the pressing process, the lower heating plate 40 and the upper heating plate 30... The heat generated by plate 30 is transferred to the metal workpiece, causing the metal workpiece to be extruded and formed at a predetermined temperature. After the extrusion of the metal workpiece is completed, the lifting seat 20 moves down a certain distance, moving the support 61 inward so that the roller 63 is located below the side of the tray 50. Then the lifting seat 20 moves down to the lowest position, using the roller 63 to support the tray 50, so that the tray 50 is separated from the lower heating plate 40. Finally, the tray 50 is moved out using the dragging mechanism, so that the multi-layer hot pressing device is ready to perform the next hot pressing process of multiple metal workpieces.

[0037] This utility model's multi-layer hot pressing device can simultaneously hot press multiple metal workpieces. During the process of feeding and removing metal workpieces into and from the hot pressing device using the tray 50, the tray 50 is supported by the support component 60. As the tray 50 moves back and forth, it will not come into contact with the surface of the lower heating plate 40 located below it, thus preventing wear on the lower heating plate 40. This ensures a high degree of flatness on the upper surface of the lower heating plate 40, improving the pressing quality of the metal workpieces and avoiding uneven pressing, air bubbles, voids, and other abnormalities. Furthermore, since the support component 60 protects the lower heating plate 40, frequent replacement of the lower heating plate 40 is unnecessary, extending the equipment maintenance cycle, reducing equipment maintenance costs, improving production efficiency, and preventing metal debris generated by friction between the tray 50 and the lower heating plate 40 from affecting the pressing environment.

[0038] To facilitate the installation of the multiple rollers 63, a connecting seat 62 is provided on the mounting plate 611. The connecting seat 62 includes a fixing plate 621 fixed on the mounting plate 611 and a connecting plate 622 bent from the inner side line of the fixing plate 621. Specifically, the connecting seat 62 is an angle iron. The multiple rollers 63 are detachably installed on the connecting plate 622 by bolts passing through the connecting plate 622. During assembly, the multiple rollers 63 can be installed on the connecting seat 62 to form an assembly, and then the assembly can be connected to the mounting plate 611.

[0039] In other embodiments of this utility model, a metal support strip extending in the front-back direction can be provided on the mounting plate 611. The top of the metal support strip forms a support portion. The metal support strip is detachably fixed to the mounting plate 611. The top of the metal support strip supports the tray 50, allowing the tray 50 to move back and forth along the metal support strip. This prevents the tray 50 from contacting the upper surface of the lower heating plate 40 when it moves back and forth. The metal support strip is detachably fixed to the mounting plate 611. After the metal support strip wears out, a new metal support strip can be replaced. The metal support strip can be replaced by a rigid support strip made of other non-metallic materials.

[0040] To make the overall structure of the hot pressing device more compact, recesses 43 are provided on both sides of the lower heating plate 40 to avoid the two supports 61. The distance between the inner end faces of the two recesses 43 is D1, and the width of the tray 50 is D2, where D1 < D2. Thus, when the tray 50 is moved above the lower heating plate 40, the left and right sides of the tray 50 protrude from the sides of the lower heating plate 40, that is, in the left and right direction, the two sides of the tray 50 protrude from the inner end faces of the two recesses 43. When the supports 61 are moved along a straight guide... When the rail 70 moves to a position close to the lower heating plate 40, the two support parts of the support unit are respectively supported under the portions of the tray 50 that protrude from the sides of the lower heating plate 40. That is, the two rows of rollers 63 on the left and right sides of the support unit can be supported under the tray 50 in the position inside the recess 43. The recess 43 provides space for the left and right movement of the bracket 61, and prevents the support component 60 from protruding from the sides of the lower heating plate 40, so that both the lower heating plate 40 and the support component 60 are within the coverage area of ​​the upper heating plate 30.

[0041] The base 10 has a storage groove extending downwards from its top. The lifting seat 20 is embedded in the storage groove. A drive mechanism is located at the bottom of the storage groove inside the base 10, which drives the lifting seat 20 to move up and down. The drive mechanism can be a hydraulic cylinder. The cross-section of the lifting seat 20 is the same as the cross-section of the storage groove, thus guiding the up and down movement of the lifting seat 20 and preventing it from swaying during the movement, thereby improving the accuracy of metal hot pressing. The upper heating plate 30 is fixedly fitted to the base 10, and the top of the lifting seat 20 is fixedly connected to the bottom of the lower heating plate 40.

[0042] The base 10 has multiple upwardly extending fixing posts 11 at its top. Specifically, a fixing post 11 is provided at each of the four corners of the top of the base 10, and the tops of the four fixing posts 11 are fixedly connected to the four corners of the upper heating plate 30. A through hole 42 is provided at each of the four corners of the lower heating plate 40. Specifically, based on the recess 43 on the lower heating plate 40, a protruding connecting block 41 is formed at each corner of the lower heating plate 40, and the through hole 42 is provided on the connecting block 41. Multiple limiting flanges 111 are provided on the fixing posts 11, and the multiple limiting flanges 111 are respectively located at the lower corners of the multiple lower heating plates 40. When the lower heating plate 40 is in the first position, that is, when the lower heating plate 40 is not lifted by the lifting seat 20, the multiple limiting flanges 111 abut against the lower surface of the connecting blocks 41 on the multiple lower heating plates 40, so that the two adjacent lower heating plates 40 are spaced apart by a certain distance, and the uppermost lower heating plate 40 and the upper heating plate 30 are spaced apart by a certain distance. The distance between them is greater than the total thickness of the tray 50 and the metal workpiece, thereby ensuring that the tray 50 and the metal workpiece on the tray 50 can enter between the adjacent lower heating plates 40 and between the uppermost lower heating plate 40 and the upper heating plate 30.

[0043] To achieve continuous operation, the hot pressing device of this utility model also includes a carrier return line mechanism, which is used to transport the pallet 50. A loading station is set at a specific position on the pallet 50, and a base 10 is set at the loading station. A towing mechanism is used to drive the pallet 50 to move back and forth, so that the pallet 50 can move between the loading station of the carrier return line mechanism and above the base 10. During operation, the pallet 50 with the metal workpiece is moved to the loading station with the carrier return line mechanism. The towing mechanism pushes the pallet 50 upwards towards the base 10, so that the pallet 50 is finally supported by the support assembly 60 and located above the lower heating plate 40. After the hot pressing of the metal workpiece is completed, the towing mechanism moves the pallet 50 from the support assembly 60 to the carrier return line mechanism.

[0044] It should be noted that the multi-layer hot pressing device of this utility model is not only applicable to the hot extrusion of metal workpieces, but also to the hot extrusion of some non-metallic materials.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-layer hot pressing device, characterized in that, Includes a base, lifting seat, upper heating plate, multiple lower heating plates, multiple trays, and a dragging mechanism; The upper heating plate is located above the base, and multiple lower heating plates are placed between the base and the upper heating plate and arranged in the vertical direction. Each lower heating plate has a degree of freedom of movement relative to the base in the vertical direction. The lifting seat is installed on the base and is used to drive multiple lower heating plates to move in the vertical direction at the first and second positions. When the multiple lower heating plates are in the first position, the two adjacent lower heating plates are separated and the top lower heating plate is separated from the top heating plate. When the multiple lower heating plates are in the second position, the two adjacent lower heating plates are closed and the top lower heating plate is closed. The base is provided with a support assembly on top. The support assembly includes multiple support units that correspond one-to-one with multiple lower heating plates. Each support unit includes two support parts located on both sides of the lower heating plate. When the lower heating plate is in the first position, the support parts are higher than the upper surface of the lower heating plate. When the lower heating plate is in the second position, the support parts are lower than the upper surface of the lower heating plate. The dragging mechanism is used to move multiple trays back and forth, so that when the multiple lower heating plates are in the first position, the multiple trays slide along the multiple support units and are placed on top of the multiple lower heating plates respectively.

2. The multi-layer hot pressing device as described in claim 1, characterized in that, The support assembly includes two brackets located on both sides of multiple lower heating plates. The support part is mounted on the brackets and extends in the front-to-back direction. A linear guide pair is provided on the base. Both brackets are mounted on the linear guide pair so that the brackets can move relative to the base in the left-to-right direction.

3. The multi-layer hot pressing device as described in claim 2, characterized in that, The bracket includes multiple mounting plates arranged vertically, connecting columns that fix the multiple mounting plates together, and a support portion set on the mounting plates.

4. The multi-layer hot pressing device as described in claim 3, characterized in that, The mounting plate is pivotally connected to multiple rollers arranged in the front-to-back direction, and the tops of the multiple rollers together form a support.

5. The multi-layer hot pressing device as described in claim 4, characterized in that, The mounting plate is provided with a connecting seat, which includes a fixing plate fixed to the mounting plate, a connecting plate bent upward from the inside of the fixing plate, and multiple rollers detachably mounted on the connecting plate by bolts passing through the connecting plate.

6. The multi-layer hot pressing device as described in claim 3, characterized in that, The mounting plate is provided with a rigid support bar extending in the front-to-back direction. The top of the rigid support bar forms a support part, and the rigid support bar is fixed to the mounting plate in a detachable manner.

7. The multi-layer hot pressing device as described in claim 2, characterized in that, The lower heating plate has a recess on each side to avoid the two supports. The distance between the inner end faces of the two recesses is D1, and the width of the tray is D2, where D1 < D2, so that when the tray is above the lower heating plate, the two sides protrude from the sides of the lower heating plate respectively. The parts of the tray that protrude from the sides of the lower heating plate are supported by the two support parts of the support unit respectively.

8. The multi-layer hot pressing device as described in claim 1, characterized in that, The base is provided with a storage groove extending downward from its top. The lifting seat is embedded in the storage groove. The cross-section of the storage groove is the same as the cross-section of the lifting seat so as to guide the up and down movement of the lifting seat through the storage groove. The upper heating plate is fixedly fitted with the base, and the top of the lifting seat is fixedly connected to the bottom of the lower heating plate.

9. The multi-layer hot pressing device as described in claim 1, characterized in that, The base has multiple upward-extending fixing posts at its top, and the tops of the fixing posts are fixedly connected to the upper heating plate. The lower heating plate has through holes for the fixing posts to pass through. The fixing posts have multiple limiting flanges, which are positioned below the lower heating plates. When the lower heating plate is in the first position, the limiting flanges abut against the lower surface of the corresponding lower heating plate.

10. The multi-layer hot pressing device as described in claim 1, characterized in that, It also includes a carrier return line mechanism, which has a loading station and a base located at the loading station. A towing mechanism drives the pallet to move back and forth so that the pallet can move between the loading station and the base.

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