Plate vacuum thermal transfer printing apparatus

Abstract

Disclosed is a plate vacuum thermal transfer printing apparatus, comprising a frame (1), a vacuum pump device (2), a heat-conducting box (3), and a transfer printing assembly (9) covering the heat-conducting box, wherein the frame is provided with a lifting driving mechanism (4), a conveying mechanism (6), a first heating mechanism (51), and a second heating mechanism (52); a heat-conducting conveyor belt (62) of the conveying mechanism is in contact with a heating surface of the second heating mechanism; the heat-conducting box is located on the heat-conducting conveyor belt, and a plate (8) to be processed is provided between the heat-conducting box and the heat-conducting conveyor belt; and the lifting driving mechanism is connected to the first heating mechanism, and the heat-conducting box is connected to the vacuum pump device (2). The transfer printing apparatus enables transfer printing of images on multiple surfaces of the plate to be processed.

Description

A vacuum heat transfer printing device for sheet metal

[0001] This application claims priority to Chinese Patent Application No. 202520445421.9, filed on March 14, 2025, entitled "A Vacuum Heat Transfer Printing Equipment for Sheet Metal", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a vacuum heat transfer printing device for sheet metal. Background Technology

[0003] Heat transfer printing is a technique for decorating the surface of stone slabs, which can give the stone slabs personalized patterns and textures. It is done by using heat transfer printing equipment to heat and apply pressure to transfer paper or transfer film with a pattern, so that it adheres to the quartz stone surface to form a decorative pattern.

[0004] Typical heat transfer printing equipment usually consists of a heating device, a pressure device, and a control system. The heating device includes an upper heating plate and a lower heating plate. During operation, transfer paper or transfer film with a pattern or design is placed on the upper surface of a quartz slab. Then, the upper heating plate presses down on the quartz slab located on the lower heating plate. Based on the heat and pressure, the transfer paper or transfer film adheres to the upper surface of the quartz slab, forming a decorative pattern or design. However, as users' requirements become increasingly demanding, the single-sided patterns or designs produced by the above-mentioned equipment can no longer meet their needs. Therefore, there is an urgent need for heat transfer printing equipment that can achieve multi-sided heat transfer of patterns or designs onto quartz slabs. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a vacuum heat transfer printing device for sheet metal, which can realize the transfer of images or patterns on multiple sides of the sheet metal to be processed, resulting in a beautiful sheet metal and meeting the increasingly demanding product requirements of users.

[0006] To address the aforementioned technical problems, this application provides a vacuum heat transfer printing device for sheet metal, comprising a frame, a vacuum pump, a heat-conducting box, and a transfer assembly. The frame is equipped with a lifting drive mechanism, a heating mechanism, and a conveying mechanism. The heating mechanism includes a first heating mechanism and a second heating mechanism. The first heating mechanism is located above the heat-conducting conveyor belt of the conveying mechanism, and the heat-conducting conveyor belt of the conveying mechanism is in contact with the heating surface of the second heating mechanism located below it. The heat-conducting box is located on the heat-conducting conveyor belt, and the transfer assembly is covered on the heat-conducting box, forming a sealed heating cavity between the two. The sealed heating cavity contains a sheet metal to be processed that is lifted up, and the transfer element in the transfer assembly is located above the sheet metal to be processed. The lifting drive mechanism is connected to the first heating mechanism and is used to drive the first heating mechanism to move and abut against the transfer assembly. At least one side of the heat-conducting box is provided with an exhaust pipe connected to the sealed heating cavity, and the exhaust pipe is connected to the vacuum pump through a pipe.

[0007] As an improvement to the above solution, the transfer assembly includes a heat-conducting pressure plate and a transfer element. The heat-conducting pressure plate covers the heat-conducting box, and the two enclose each other to form the sealed heating cavity. The transfer element is located in the sealed heating cavity and laid on the material to be processed. The horizontal dimension of the transfer element is larger than the horizontal dimension of the material to be processed.

[0008] As an improvement to the above solution, the transfer assembly includes a heat-conducting hollow frame and a transfer element. The transfer element is laid on the heat-conducting box, and the horizontal dimension of the transfer element is greater than or equal to the dimension of the heat-conducting box. The heat-conducting hollow frame presses the transfer element onto the heat-conducting box to enclose and form the sealed heating cavity.

[0009] As an improvement to the above solution, a protrusion array is provided on the bottom surface of the heat-conducting box, which is used to lift the plate to be processed; the protrusion array includes multiple protrusions arranged in an array.

[0010] As an improvement to the above solution, multiple air extraction pipes are provided at intervals on one or both sides of the heat conduction box.

[0011] As an improvement to the above solution, the upper part of the heat-conducting box is provided with at least one sealing mounting groove surrounding its opening, and a sealing ring is provided in the sealing mounting groove.

[0012] As an improvement to the above solution, the transfer material is a PVC film, PET film, or PETG film with a pattern or design; the board to be processed is a flat plate or a flat plate with a hollow structure.

[0013] As an improvement to the above solution, the conveying mechanism is used to transport the fed heat-conducting box to the designated processing position and to transport the heat-conducting box after heat transfer outward. The conveying mechanism includes a conveying frame, a conveying drive device, a drive roller, a driven roller, and a heat-conducting conveyor belt. The conveying frame is installed on both sides of the machine frame, and the drive roller and driven roller are respectively installed on the conveying frame on both sides. The drive roller is drivenly connected to the driven roller through the heat-conducting conveyor belt, and the conveying drive device is drivenly connected to the drive roller. The second heating mechanism is provided in the area enclosed by the heat-conducting conveyor belt, and the heating surface of the second heating mechanism is in contact with the heat-conducting conveyor belt.

[0014] As an improvement to the above solution, multiple lifting drive mechanisms are respectively arranged around the frame. Each lifting drive mechanism includes a lifting drive device, which is mounted on the frame. The drive rod of the lifting drive device is connected to the first heating mechanism. The first heating mechanism includes an upper heat-conducting frame connected to the drive rod of the lifting drive mechanism. A heat-conducting layer is provided at the lower part of the upper heat-conducting frame. A heating installation area is formed between the upper heat-conducting frame and the heat-conducting layer. A first heat-insulating plate and a first electric heat-conducting plate are provided in the heating installation area. The two ends of the first electric heat-conducting plate abut against the first heat-insulating plate and the heat-conducting layer, respectively.

[0015] As an improvement to the above solution, the second heating mechanism includes a lower heat-conducting frame mounted on the frame, on which a second heat-insulating layer and a second electric heat-conducting plate are mounted. The two ends of the second electric heat-conducting plate abut against the second heat-insulating layer and the upper heat-conducting conveyor belt, respectively.

[0016] The beneficial effects of implementing this application are as follows:

[0017] This application utilizes a heat-conducting box and a heat-conducting component to form a sealed heating chamber. A lifting drive mechanism and a first heating mechanism apply pressure to the heat-conducting component, improving the sealing connection between the heat-conducting box and the component and preventing air leakage from affecting the stable operation of the vacuum heat transfer process. Through the combined action of the first heating mechanism, the second heating mechanism, and the vacuum pump, the sealed heating chamber is kept in a vacuum high-temperature operating state, improving heat transfer efficiency. In this environment, the transfer material shrinks due to heat and adheres to the upper surface and multiple sides of the lifted material to be processed, thus achieving image or pattern transfer on multiple sides of the material, improving its aesthetics and meeting the increasingly demanding product requirements of users, demonstrating excellent practicality. Furthermore, a conveying mechanism transports the externally fed heat-conducting box to the designated processing position and then transports the heat-transferred heat-conducting box to the next workstation. The entire material movement process requires no manual handling, effectively improving personnel safety and thus enhancing the operational safety of the heat transfer equipment. Attached Figure Description

[0018] Figure 1 is a structural schematic diagram of the first embodiment of the vacuum heat transfer printing equipment for sheet metal of this application;

[0019] Figure 2 is a schematic diagram of the transfer assembly and heat-conducting box in Figure 1;

[0020] Figure 3 is an enlarged structural diagram of part A in Figure 2;

[0021] Figure 4 is a three-dimensional structural diagram of the vacuum heat transfer printing equipment for the sheet metal shown in Figure 1.

[0022] Figure 5 is a side view of the vacuum heat transfer equipment for the sheet metal shown in Figure 1.

[0023] Figure 6 is a cross-sectional view of the vacuum heat transfer printing equipment for the sheet metal shown in Figure 1.

[0024] Figure 7 is an enlarged structural diagram of part A in Figure 4;

[0025] Figure 8 is an enlarged structural diagram of part A in Figure 6;

[0026] Figure 9 is a schematic diagram of the connection structure of the universal joint of this application;

[0027] Figure 10 is a structural schematic diagram of the second embodiment of the vacuum heat transfer printing equipment for sheet metal of this application;

[0028] Figure 11 is a schematic diagram of the transfer assembly and heat-conducting box in Figure 10. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings.

[0030] As shown in Figures 1 and 2, this application provides a structural schematic diagram of a first embodiment of a vacuum heat transfer printing device for sheet metal, including a frame 1, a vacuum pump device 2, a heat-conducting box 3, and a transfer assembly 9. The frame 1 is provided with a lifting drive mechanism 4, a heating mechanism 5, and a conveying mechanism 6. The heating mechanism 5 includes a first heating mechanism 51 and a second heating mechanism 52. The first heating mechanism 51 is located above the heat-conducting conveyor belt 65 of the conveying mechanism 6, and the heat-conducting conveyor belt 65 of the conveying mechanism 6 contacts the heating surface of the second heating mechanism 52 located below it to achieve heat conduction. The heat-conducting box 3 is located on the heat-conducting conveyor belt 65, and the transfer assembly 9 covers the heat-conducting box 3, forming a sealed heating cavity 35 between the two. The sealed heating cavity 35 contains a sheet metal to be processed that is lifted up, and the transfer element 92 in the transfer assembly 9 is located above the sheet metal to be processed. A gap is left between the lifted sheet metal to be processed and the bottom surface inside the heat-conducting box 3 to provide space for the transfer element 92 to shrink and be adsorbed.

[0031] The transfer assembly 9 includes a heat-conducting pressure plate 91 and a transfer element 92. The heat-conducting pressure plate 91 covers the heat-conducting box, and the two together form the sealed heating cavity 35. The transfer element 92 is located in the sealed heating cavity 35 and is laid on the material to be processed. The horizontal dimension of the transfer element 92 is larger than the horizontal dimension of the material to be processed. The horizontal dimension of the transfer element 92 is larger than the horizontal dimension of the material to be processed to facilitate the transfer of patterns or designs on the sides of the material to be processed.

[0032] The lifting drive mechanism 4 is connected to the first heating mechanism 51 and is used to drive the first heating mechanism 51 to move and abut against the heat-conducting pressure plate 91. By applying pressure to the heat-conducting pressure plate 91, the sealing connection strength between the heat-conducting pressure plate 91 and the heat-conducting box 3 can be strengthened, thereby improving the sealing effect of the sealed heating cavity 35 and preventing air leakage from affecting the stable operation of the vacuum heat transfer process. The heating surface of the first heating mechanism 51 faces the heat-conducting pressure plate 91 to transfer heat to the heat-conducting box, thereby increasing the working temperature in the sealed heating cavity 35. The heat-conducting box 3 has an exhaust pipe 32 on at least one side that is connected to the sealed heating cavity 35. The exhaust pipe 32 is connected to the vacuum pump device 2 through a pipe, thereby allowing the vacuum pump device 2 to perform vacuum treatment on the heat-conducting box 3.

[0033] During heat transfer printing, the heat-conducting pressure plate 91 abuts against the first heating mechanism 51. The first heating mechanism 51 conducts heat to the heat-conducting box 3 via the heat-conducting pressure plate 91, thereby increasing the working temperature in the sealed heating cavity 35. Furthermore, the heat-conducting box 3 abuts against the heat-conducting conveyor belt 65, and the heat from the second heating mechanism 52 is conducted to the heat-conducting box 3 via the heat-conducting conveyor belt 65, also contributing to heat conduction. This further accelerates the heating efficiency in the sealed heating cavity 35 and increases its working temperature. Simultaneously, during operation, the vacuum pump device 2 evacuates the sealed heating cavity 35, placing it in a high-temperature vacuum state, thereby improving the shrinkage and adsorption effect of the transfer piece 92. When the transfer piece 92 is vacuumed and heated to shrink, its middle part will shrink downward and adhere tightly to the upper surface of the plate 8 to be processed, while its periphery will shrink downward and move to adhere tightly to the four sides or the four sides and part of the bottom surface of the plate 8 to be processed. Then, as the temperature rises, the image or pattern layer on the transfer piece 92 will be transferred onto the high-temperature plate, thereby producing plates with patterns or designs on multiple surfaces (such as quartz plates), improving the aesthetics of the plates, meeting the increasingly higher product demands of users, and having excellent practicality.

[0034] Secondly, the conveying mechanism 6 is used to transport the fed heat-conducting box 3 to the designated processing position and to transport the heat-conducting box 3 after heat transfer outward. The entire board movement process does not require manual handling, which effectively improves the work safety of personnel and thus improves the safety of using the heat transfer equipment.

[0035] As shown in Figure 2, in order to lift the sheet material 8 to be processed, a raised array 31 is provided on the bottom surface of the heat-conducting box 3. The raised array 31 is used to lift the sheet material 8 to provide a space for movement, so that the edges of the transfer piece 92 can be fitted and moved along the shape of the sheet material during shrinkage and adsorption, thereby realizing the transfer and edge-wrapping function of the four sides of the transfer piece 92. The raised array 31 includes a plurality of raised parts 311 arranged in an array.

[0036] For example, in order to achieve uniform vacuuming of the heat-conducting box 3, multiple air extraction pipes 32 are provided at intervals on both sides of the heat-conducting box 3. Vacuuming is performed on different positions of the heat-conducting box 3 through multiple air extraction pipes 32 to improve the uniformity of vacuuming and ensure that the transfer parts 92 at different positions can initially shrink uniformly and be adsorbed onto the board.

[0037] To improve the sealing effect of the heat-conducting box 3, as shown in Figures 2 and 3, the upper part of the heat-conducting box 3 is provided with at least one sealing mounting groove 33 surrounding its opening, and a sealing ring 34 is provided in the sealing mounting groove 33. When the heat transfer is in operation, the heating surface of the first heating mechanism 51 will press the sealing ring 34 and abut against the heat-conducting box 3. The sealing ring 34 further improves the sealing effect of the heat-conducting box 3, preventing air from entering the sealed heating cavity 35 and affecting the heat transfer effect.

[0038] For example, in order to improve the multi-sided transfer effect of the board 8 to be processed, the transfer part 92 is a PVC film, PET film or PETG film with good thermoplasticity, but it is not limited to this. The transfer part 92 with good thermoplasticity can better adsorb and transfer the pattern or design onto the surface of each side of the board 8 to be processed, thereby improving the multi-sided heat transfer effect of the board.

[0039] For example, as shown in Figure 2, the material to be processed 8 is a flat plate with a hollow structure. When the sealed heating chamber 35 is evacuated and heated, the central area of ​​the transfer piece 92 will shrink downward and move to the movable space, adhering to the four inner sides of the hollow opening 81 of the material, or the four inner sides and part of the bottom surface. The pattern or design on the transfer piece 92 is gradually transferred to the hollow structure under high temperature, further improving the multi-faceted heat transfer effect and the aesthetics of the material. In other embodiments, the material to be processed 8 may also be a flat plate.

[0040] To achieve the conveying of the sheet metal, as shown in Figures 1, 4, 5, and 7, the conveying mechanism 6 includes a conveying frame 61, a conveying drive device 62, a drive roller 63, a driven roller 64, and a heat-conducting conveyor belt 65. The conveying frame 61 is installed on both sides of the frame 1, and the drive roller 63 and driven roller 64 are respectively installed on the conveying frame 61 on both sides. The drive roller 63 is connected to the driven roller 64 via the heat-conducting conveyor belt 65. A second heating mechanism 52 is provided in the area enclosed by the heat-conducting conveyor belt 65. The heating surface of the second heating mechanism 52 is in contact with the heat-conducting conveyor belt 65 above to heat the heat-conducting boxes 3 on the heat-conducting conveyor belt 65. The conveying drive device 62 is installed on one side of the conveying frame 61 and is connected to the drive roller 63 to drive the drive roller 63 to rotate, thereby driving the heat-conducting conveyor belt 65 and the driven roller 64 to rotate, and then driving the heat-conducting boxes located on the heat-conducting conveyor belt 65 to move, thus realizing the conveying of the sheet metal.

[0041] For example, the conveying drive device 62 includes a drive motor 621, a reducer 622, and a coupling 623 connected in sequence. The two ends of the drive roller 63 are fixed on the conveying frame 61 by bearing seats 631. The coupling 623 is connected to one end of the drive roller 63 through the bearing portion on the bearing seat 631. When the drive motor 621 is working, it can drive the drive roller 63 to rotate, thereby realizing the conveying operation of the conveying mechanism 6.

[0042] To improve the conveying stability of the heat-conducting conveyor belt 65, the conveying mechanism 6 further includes a tension adjustment assembly 66, which is respectively disposed on both ends of the conveying frame 61 at the driven roller 64. The tension adjustment assembly 66 includes a conveying connecting frame 661, a guide rail sliding plate 662, and an adjusting screw 663. The conveying connecting frame 661 is installed on one end of the conveying frame 61. The conveying connecting frame 661 is provided with guide rail sliding plates 662 arranged vertically. A sliding bearing 664 is provided between the upper and lower guide rail sliding plates 662 and is slidably connected to the sliding bearing 664. An adjusting screw 663 is provided at one end of the sliding bearing 664. One end of the adjusting screw 663 passes through the conveying connecting frame 661 and is threadedly connected to the connecting part of the conveying connecting frame 661. The bearing part of the sliding bearing 664 is connected to the driven roller 64. When the adjusting screws 663 on both sides are adjusted, the sliding bearing 664 can be driven to move along the guide rail direction of the guide rail sliding plate 662 to adjust the position of the driven roller 64, thereby adjusting the tension of the heat-conducting conveyor belt 65, so that the heat-conducting conveyor belt 65 is kept evenly taut, ensuring the smooth flow of the stone slab during the conveying process, and improving the transmission efficiency of the heat-conducting conveyor belt 65 and extending its service life.

[0043] To achieve stable lifting and lowering movement, as shown in Figures 1-2 and 4-5, multiple lifting drive mechanisms 4 are respectively arranged around the frame 1. Each lifting drive mechanism 4 includes a lifting drive device 41 and a guide rod 42. The lifting drive device 41 is mounted on the frame 1, and one end of the guide rod 42 passes through the guide sleeve of the frame 1 and connects to the first heating mechanism 51. The drive rod 411 of the lifting drive device 41 is connected to the first heating mechanism 51. When the four lifting drive devices 41 drive the first heating mechanism 51 to move up and down, the guide rod 42 plays a guiding role, ensuring that the first heating mechanism 51 moves up and down stably. This allows the heating surface of the first heating mechanism 51 to tightly abut against the heat-conducting pressure plate 91, forming a stronger sealing effect for the sealed heating cavity 35 and also conducting heat to the heat-conducting box 3 and the sealed heating cavity 35, thereby improving heating efficiency.

[0044] For example, in this embodiment, the lifting drive device 41 is a hydraulic cylinder, but it is not limited thereto. In other embodiments, a hydraulic cylinder or a pneumatic cylinder may also be used.

[0045] As shown in Figures 4 to 6 and Figures 8 to 9, the first heating mechanism 51 includes an upper heat-conducting frame 511 connected to the drive rod 411 of the lifting drive mechanism 4. A heat-conducting layer 512 is provided at the lower part of the upper heat-conducting frame 511. A heating mounting area 515 is formed between the upper heat-conducting frame 511 and the heat-conducting layer 512. A first heat-insulating plate 513 and a first electrically conductive plate 514 are provided within the heating mounting area 515. The upper and lower ends of the first electrically conductive plate 514 abut against the first heat-insulating plate 513 and the heat-conducting layer 512, respectively. The first heat-insulating plate 513 reduces the heat dissipation performance of the first electrically conductive plate 514 in other directions, allowing more heat to be conducted to the heat-conducting box via the heat-conducting layer 512 and the heat-conducting pressure plate, thereby improving heating efficiency and heat transfer effect.

[0046] For example, multiple universal joints 516 are spaced apart at both ends of the first electric heat-conducting plate 514. Each universal joint 516 has a screw 517 installed at both ends. The two ends of each universal joint 516 are connected to the upper heat-conducting frame 511 and the first electric heat-conducting plate 514 respectively via the screw 517, thus achieving a fixed connection between the upper heat-conducting frame 511 and the first electric heat-conducting plate 514. The connection method of the universal joints 516 is less susceptible to changes in the mounting hole positions due to the thermal expansion and contraction characteristics of the first electric heat-conducting plate 514, improving the connection strength of the first electric heat-conducting plate 514, avoiding interference with the normal operation of the first electric heat-conducting plate 514, thereby reducing the impact on equipment operation and ensuring safe equipment operation.

[0047] The second heating mechanism 52 includes a lower heat-conducting frame 521 disposed in the area enclosed by the heat-conducting conveyor belt 65. The lower heat-conducting frame 521 is mounted on the frame, a second insulation layer 522, and a second electrically conductive heat-conducting plate 523. The second insulation layer 522 and the second electrically conductive heat-conducting plate 523 are mounted on the lower heat-conducting frame 521. The two ends of the second electrically conductive heat-conducting plate 523 abut against the second insulation layer 522 and the heat-conducting conveyor belt 65 above, respectively. The second insulation layer 522 reduces the heat dissipation performance of the second electrically conductive heat-conducting plate 523 in other directions, allowing more heat to be conducted to the heat-conducting box 3 via the heat-conducting conveyor belt 65, thereby improving the heating efficiency and heat transfer effect.

[0048] For example, multiple universal joints 516 are also provided at intervals at both ends of the second electric heat-conducting plate 523. Each universal joint 516 is equipped with a screw 517 at both ends. The two ends of the universal joint 516 are respectively connected to the lower heat-conducting frame 521 and the second electric heat-conducting plate 523 through the screw 517 to achieve a fixed connection between the lower heat-conducting frame 521 and the second electric heat-conducting plate 523. The connection method of the universal joints 516 is not easily affected by the thermal expansion and contraction characteristics of the second electric heat-conducting plate 523, which improves the connection firmness of the second electric heat-conducting plate 523, avoids affecting the normal operation of the second electric heat-conducting plate 523, thereby reducing the impact on equipment operation and ensuring safe operation of the equipment.

[0049] The first and second electric heat-conducting plates 514 and 523 are equipped with insulating protection plates 53 at the electrical connection points on both sides to provide protection. Using electric heating improves thermal conductivity and insulation performance, is environmentally friendly and pollution-free, offers excellent intelligent temperature control, and saves production costs.

[0050] For example, both the thermally conductive layer 512 and the thermally conductive conveyor belt 65 are thermally conductive belts, but this is not a limitation.

[0051] As shown in Figures 10 and 11, this application also provides a structural schematic diagram of a second embodiment of a vacuum heat transfer printing device for sheet metal. This embodiment differs from the first embodiment shown in Figure 2 in that the transfer component 9 includes a heat-conducting hollow frame 93 and a transfer element 92. The transfer element 92 is laid on the heat-conducting box 3, and the horizontal dimension of the transfer element 92 is greater than or equal to the dimension of the heat-conducting box 3. The heat-conducting hollow frame 93 presses the transfer element 92 onto the heat-conducting box 3 to enclose and form the sealed heating cavity 35.

[0052] During heat transfer printing, the heat-conducting hollow frame 93 abuts against the first heating mechanism 51. The first heating mechanism 51 can conduct heat to the transfer piece 92 and the heat-conducting box 3 through the heat-conducting hollow frame 93, and the air in the heat-conducting hollow frame 93 also plays a role in heat conduction to the transfer piece 92, thereby increasing the working temperature in the sealed heating cavity 35. Moreover, the heat-conducting box 3 abuts against the heat-conducting conveyor belt 65, and the heat from the second heating mechanism is conducted to the heat-conducting box 3 through the heat-conducting conveyor belt, which also plays a role in heat conduction, thereby further accelerating the heating efficiency in the sealed heating cavity 35 and increasing the working temperature in the sealed heating cavity 35. At the same time, during the operation, the vacuum pump device will evacuate the sealed heating cavity 35 to keep it in a vacuum high-temperature working state, thereby improving the shrinkage and adsorption effect of the transfer piece 92. When the heat-conducting hollow frame 93 surrounds the transfer piece 92, it will stretch downward and adhere tightly to the upper surface of the plate 8 to be processed during vacuuming and heat shrinkage. The transfer piece 92 located in the sealed heating chamber 35 will also stretch downward and adhere tightly to the four sides or part of the bottom surface of the plate 8 to be processed. Then, as the temperature rises, the image or pattern layer on the transfer piece 92 will be transferred onto the high-temperature plate, thereby producing plates with multiple patterns or designs on multiple surfaces (such as quartz plates), improving the aesthetics of the plates, meeting the increasingly higher product requirements of users, and having excellent practicality.

[0053] In summary, this application, through the combined use of a heat-conducting box and a heat-conducting component, can enclose and form a sealed heating chamber. The lifting drive mechanism and the first heating mechanism apply pressure to the heat-conducting component, improving the sealing connection between the heat-conducting box and the component and preventing air leakage from affecting the stable operation of the vacuum heat transfer process. Through the combined action of the first heating mechanism, the second heating mechanism, and the vacuum pump, the sealed heating chamber is kept in a vacuum high-temperature working state, improving the efficiency of the heat transfer process. In this environment, the transfer piece shrinks due to heat and adheres to the upper surface and multiple other sides of the lifted material to be processed, thereby achieving image or pattern transfer on multiple sides of the material, improving the aesthetics of the material and meeting the increasingly demanding product requirements of users, demonstrating excellent practicality. Furthermore, the conveying mechanism can transport the externally fed heat-conducting box to the designated processing position and transport the heat-transferred heat-conducting box to the next workstation. The entire material movement process requires no manual handling, effectively improving the safety of personnel and thus enhancing the safety of the heat transfer equipment.

[0054] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A vacuum heat transfer printing device for sheet metal, wherein, It includes a frame, a vacuum pump device, a heat conduction box, and a transfer assembly. The frame is equipped with a lifting drive mechanism, a heating mechanism, and a conveying mechanism. The heating mechanism includes a first heating mechanism and a second heating mechanism. The first heating mechanism is located above the heat-conducting conveyor belt of the conveying mechanism, and the heat-conducting conveyor belt of the conveying mechanism is in contact with the heating surface of the second heating mechanism located below it; The heat-conducting box is located on the heat-conducting conveyor belt, and the transfer assembly covers the heat-conducting box. A sealed heating cavity is formed between the two, and a plate to be processed is provided in the sealed heating cavity. The transfer component in the transfer assembly is located above the plate to be processed. The lifting drive mechanism is connected to the first heating mechanism and is used to drive the first heating mechanism to move and abut against the transfer component. The heat-conducting box is provided with an extraction pipe on at least one side that is connected to the sealed heating chamber, and the extraction pipe is connected to the vacuum pump device through a pipe.

2. The vacuum heat transfer printing equipment for sheet metal as described in claim 1, wherein, The transfer assembly includes a heat-conducting pressure plate and a transfer element. The heat-conducting pressure plate covers the heat-conducting box, and the two enclose the sealed heating cavity. The transfer piece is located in the sealed heating chamber and laid on the substrate to be processed, and the horizontal dimension of the transfer piece is larger than the horizontal dimension of the substrate to be processed.

3. The vacuum heat transfer printing equipment for sheet metal as described in claim 1, wherein, The transfer assembly includes a heat-conducting hollow frame and a transfer element. The transfer element is laid on the heat-conducting box, and the horizontal dimension of the transfer element is greater than or equal to the dimension of the heat-conducting box. The heat-conducting hollow frame presses the transfer piece onto the heat-conducting box to enclose and form the sealed heating cavity.

4. The vacuum heat transfer printing equipment for sheet metal as described in claim 1, wherein, The bottom surface of the heat-conducting box is provided with a protrusion array, which is used to lift the plate to be processed. The protrusion array includes multiple protrusions arranged in an array.

5. The vacuum heat transfer printing equipment for sheet metal as described in claim 1, wherein, The heat-conducting box is provided with multiple air extraction pipes at intervals on one or both sides.

6. The vacuum heat transfer printing equipment for sheet metal as described in claim 1, wherein, The upper part of the heat-conducting box is provided with at least one sealing mounting groove surrounding its opening, and a sealing ring is provided in the sealing mounting groove.

7. The vacuum heat transfer printing equipment for sheet metal as described in any one of claims 1 to 3, wherein, The transfer material is a PVC film, PET film, or PETG film with a pattern or design; the substrate to be processed is a flat plate or a flat plate with a hollow structure.

8. The vacuum heat transfer printing equipment for sheet metal as described in any one of claims 1 to 6, wherein, The conveying mechanism is used to transport the fed heat-conducting box to the designated processing position and to transport the heat-conducting box after heat transfer outward. The conveying mechanism includes a conveyor frame, a conveying drive device, a drive roller, a driven roller, and a heat-conducting conveyor belt. The conveyor frames are respectively installed on both sides of the frame, and the two sides of the conveyor frames are respectively equipped with a drive roller and a driven roller. The drive roller is drivenly connected to the driven roller through the heat-conducting conveyor belt, and the conveying drive device is drivenly connected to the drive roller. The area enclosed by the heat-conducting conveyor belt is provided with a second heating mechanism, and the heating surface of the second heating mechanism is in contact with the heat-conducting conveyor belt.

9. The vacuum heat transfer printing equipment for sheet metal as described in any one of claims 1 to 6, wherein, Multiple lifting drive mechanisms are respectively arranged around the frame. Each lifting drive mechanism includes a lifting drive device, which is mounted on the frame. The drive rod of the lifting drive device is connected to the first heating mechanism. The first heating mechanism includes an upper heat-conducting frame connected to the drive rod of the lifting drive mechanism. A heat-conducting layer is provided at the lower part of the upper heat-conducting frame. A heating installation area is formed between the upper heat-conducting frame and the heat-conducting layer. A first heat-insulating plate and a first electric heat-conducting plate are provided in the heating installation area. The two ends of the first electric heat-conducting plate abut against the first heat-insulating plate and the heat-conducting layer, respectively.

10. The vacuum heat transfer printing equipment for sheet metal as described in claim 8, wherein, The second heating mechanism includes a lower heat-conducting frame mounted on a frame, on which a second heat-insulating layer and a second electric heat-conducting plate are mounted. The two ends of the second electric heat-conducting plate abut against the second heat-insulating layer and the heat-conducting conveyor belt above, respectively.

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