Heating device of hot press

Abstract

The utility model belongs to the technical field of hot press equipment, and particularly relates to a hot press heating device which is arranged on a hot press and sequentially comprises a first protective layer, a first insulating layer, a graphene heating layer, a second insulating layer and a second protective layer. The graphene hot press is simple in structure, convenient to install, high in heat utilization rate, low in energy consumption, safe, environmentally friendly and energy-saving, and the current situations of high energy consumption, high pollution and high safety risk existing in use of the hot press can be fundamentally solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot press equipment, and particularly relates to a heating device for a hot press. Background Art

[0002] At present, the structural forms of hot presses are diverse, but their basic structure and working principle are roughly the same: they mainly consist of a hot press plate and an oil cylinder, which controls the movement of the hot press plate to achieve pressurization; a heating channel is opened in the hot press plate, and heat is usually provided to the hot press plate by thermal oil or resistance wire, heating tube, etc. However, the above methods of providing heat all have major disadvantages.

[0003] The heat source for the hot press is mainly provided by natural gas, which heats the heat transfer oil (medium) in the boiler (mold temperature controller) and is then pressurized by a circulating pump and transported to the hot press plate through a pipeline, so that the hot press plate reaches the necessary working temperature. However, my country relies on large-scale imports of natural gas, which produces a large amount of CO2 and NO when burned. S Harmful gases such as argon, argon, and coke are emitted, and the boiler (mold temperature controller) furnace body, exhaust port, circulation pump, pipeline, valve, etc. cause large heat loss, and the thermal energy utilization rate is about 45%. At the same time, a large number of safety accidents are related to it. Laboratories or small-batch production often use resistance wires and heating tubes to heat the pressing plate, which are easy to oxidize and have a short service life. During use, problems are prone to occur, delaying production and increasing costs. In addition, the thermoelectric conversion rate is relatively low and the heating speed is slow. This has also resulted in the fact that resistance wires and heating tubes are rarely used to heat the hot pressing plate in this field, and are not used in industrial production applications. Utility Model Content

[0004] In response to the current technical problems, the utility model provides a hot press heating device with a simple structure, easy installation, high heat utilization rate, low energy consumption, safety, environmental protection and energy saving. It can fundamentally solve the current situation of high energy consumption, high pollution and high safety risks in the use of hot presses.

[0005] The technical solution of the utility model is as follows:

[0006] A heating device for a hot press is provided on the hot press. The heating device sequentially comprises a first protective layer, a first insulating layer, a graphene heating layer, a second insulating layer, and a second protective layer; both ends of the graphene heating layer are connected to a control system via wires.

[0007] Preferably, a temperature measuring element is provided on the graphene heating layer, and the temperature measuring element is connected to the control system via a wire.

[0008] Preferably, the first protective layer is a polymer flexible material, and the second protective layer is a flexible heat-insulating material; the heating device is connected to the hot pressing plate of the hot press.

[0009] Further preferably, structural adhesive is applied to the edges of the first protective layer, the first insulating layer, the graphene heating layer, the second insulating layer, and the second protective layer; the bonding strength of the structural adhesive is ≥0.8 MPa, and it has insulating properties. More preferably, the thickness of the first protective layer is ≥1 mm, and the thickness of the second protective layer is ≥2 mm.

[0010] Preferably, the first protective layer is an upper metal heat conducting plate, the second protective layer is a lower metal heat conducting plate, and the thickness of the upper metal heat conducting plate and the lower metal heat conducting plate is ≥15 mm; the heating device is connected to a hot press.

[0011] Further preferably, grooves are provided on the opposing surfaces of the upper metal heat conducting plate and the lower metal heat conducting plate respectively, a first insulating layer, a graphene heating layer and a second insulating layer are provided in the grooves, and a third insulating layer is provided between the upper metal heat conducting plate, the lower metal heat conducting plate and the graphene heating layer; the upper metal heat conducting plate is connected to the lower metal heat conducting plate, and the wires connecting the graphene heating layer and the temperature measuring element pass through the third insulating layer, the upper and lower metal heat conducting plates to connect the control system.

[0012] More preferably, half through holes are respectively provided on the side walls of the grooves of the upper metal heat conducting plate and the lower metal heat conducting plate, which together constitute a through hole; the through holes can be respectively provided at both ends of the heating device to facilitate the passage of the wires.

[0013] More preferably, when the through hole is only provided at one end of the heating device, half grooves are respectively provided on the side walls of the grooves of the upper metal heat conducting plate and the lower metal heat conducting plate, which together constitute a preset wire groove, in which the wires connected to the graphene heating layer or the temperature measuring element are provided, and the preset wire groove is connected to the through hole.

[0014] Further preferably, the gap between the upper metal heat conducting plate and the lower metal heat conducting plate is sealed with sealant.

[0015] Graphene heating materials have excellent thermal conductivity. At room temperature, graphene's charge carrier (conductive ion) mobility is 15,000 cm / (V·s), ten times higher than that of silicon and more than twice that of indium antimonide (nSb), the material with the highest known charge carrier mobility. Graphene heating requires electricity. When current is applied to the electrodes at both ends of the graphene heating layer, the carbon molecules in the heating layer generate phonons, ions, and electrons in the resistor. The resulting carbon clusters rub and collide with each other, generating heat energy, also known as Brownian motion. The heat energy generated by these collisions is then uniformly radiated in a planar manner through far-infrared light with a wavelength of 5-14 microns. The graphene material's total effective electrothermal energy conversion rate exceeds 99.5%, and its superconductivity ensures stable heating performance. In the present invention, electrical energy is converted into thermal energy through the instantaneous heating characteristics of the graphene heating layer, avoiding the problems of high energy consumption, high risk, low heat conversion efficiency, high cost, and environmental pollution in traditional heat-providing methods such as thermal oil. It also avoids the problems of short service life, easy failure, slow heating, low heat conversion efficiency, and high cost in traditional heat-providing methods such as resistance wire and heating tube.

[0016] The utility model provides a heating device for a hot press, which uses graphene material to generate electricity and heat instead of the traditional heating method, thus avoiding the generation of CO, CO2, NO S the utility model can save more than 35% of costs; since no boiler, pressure pipe and natural gas are used, safety hazards are eliminated and the risk factor is reduced; compared with traditional heat transfer oil, resistance wire, heating tube and other heat supply methods, the utility model improves the heating speed, improves the heat conversion efficiency, reduces the cost, increases the service life, improves the production efficiency, avoids the occurrence of safety accidents and improves the safety factor; the heating device can be manufactured in different specifications (such as 4×8 feet, 4×9 feet, 5×8 feet) according to needs; the heating device used in the hot press has been tested for 3000 hours continuously and the equipment operates normally and has a long service life.

[0017] The utility model provides a hot press heating device with a simple structure, easy installation, high heat utilization rate, low energy consumption, safety, energy saving and environmental protection, instantaneous power generation, effectively improving production efficiency and capacity, and a long service life. It can fundamentally solve the current situation of high energy consumption and high safety risks caused by the use of hot presses and is suitable for industrial production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the heating device of the hot press of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a double-sided heating device;

[0020] Figure 3 A schematic structural diagram of the second protective layer when only one through hole is provided for the double-sided heating device;

[0021] Figure 4 It is a structural diagram of the combined heating device on both sides;

[0022] Figure 5 This is a schematic diagram of the structure after the single-sided heating device is assembled;

[0023] Figure 6 This is a schematic diagram of the structure of the double-sided heating device installed in the hot press;

[0024] Figure 7 This is a schematic diagram of the structure of the single-sided heating device installed in the hot press;

[0025] In the figure, 1 is the first protective layer, 2 is the first insulating layer, 3 is the graphene heating layer, 4 is the second insulating layer, 5 is the second protective layer, 6 is the groove, 7 is the preset wire groove, 7-1 is the half groove A, 7-2 is the half groove B, 8 is the through hole, 8-1 is the half through hole A, 8-2 is the half through hole B, 9 is the heating device, 10 is the frame, 11 is the lifting device, 12 is the original hot pressing plate, and 13 is the structural adhesive. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, a hot press heating device, the heating device 9 is arranged on the hot press, and the heating device 9 comprises a first protective layer 1, a first insulating layer 2, a graphene heating layer 3, a second insulating layer 4, and a second protective layer 5 in sequence; both ends of the graphene heating layer 3 are connected to the control system through wires; the graphene heating layer 3 is composed of graphene crystals or graphene filaments, with a density of 100 to 300 g / m 2 Setting; the first insulating layer 2, the second insulating layer 4 are made of insulating glue, the insulation resistance is 0.5MΩ / kV ~ 1MΩ / kV, high temperature above 300 ℃, 100 ~ 300g / m 2 set up.

[0028] In another embodiment, a temperature measuring element is provided on the graphene heating layer 3 (the temperature measuring element is not shown in the figure), and the temperature measuring element is connected to the control system through a wire.

[0029] The control system adopts a PLC control system, the specific equipment is a control cabinet, and the control system is electrically connected to the alarm device. First, the appropriate temperature is set in the control system. The temperature measuring element transmits the monitored temperature to the control system. If the system detects that the temperature has not reached the preset temperature, the control system controls the switch to open and starts to energize the graphene heating layer 3. When the temperature reaches the set temperature, the temperature measuring element transmits the monitored temperature to the control system. If the system detects that the temperature has reached the preset temperature, the control system controls the switch to close and stop energizing the graphene heating layer 3. The temperature measuring element transmits the monitored temperature to the control system. If the temperature is too high or too low for a long time and exceeds a certain limit, the control system will control the alarm device to send an alarm signal, which can effectively verify whether the monitoring device is operating normally and effectively prevent the occurrence of safety accidents.

[0030] Another embodiment, such as Figure 1 、 Figure 5 As shown, the first protective layer 1 is a polymer flexible material with a thickness of ≥1mm, such as polystyrene, silicon tetrachloride, high temperature resistance ≥300℃, insulation resistance of 0.5MΩ / kV~1MΩ / kV, pressure ≥85kg / cm 2 The second protective layer 5 is a flexible thermal insulation material, such as hollow silicon, tetrafluoroethylene rubber film, using a polymer flexible high temperature resistant film with a thickness of ≥2mm, a thermal conductivity of ≤0.3 (w / m·k), and a pressure of ≥85kg / cm 2 Structural adhesive 13 is set on the edges of the first protective layer 1, the first insulating layer 2, the graphene heating layer 3, the second insulating layer 4, and the second protective layer 5. The bonding strength of the structural adhesive 13 is ≥0.8Mpa, and the structural adhesive 13 has insulation properties. The wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element pass through the structural adhesive 13 to connect to the control system.

[0031] The heating device 9 is connected to the bottom or top surface of the original hot pressing plate 12 of the hot pressing machine, such as Figure 7 As shown, the heating device 9 can be connected to the original hot pressing plate 12 by the commonly used clamping method in the prior art, or other connection methods can be used. The second protective layer 5 of the heating device 9 contacts the original hot pressing plate 12. The heating device 9 can be connected to the original hot pressing plate 12 in a simple manner, and there is no need to improve the original hot pressing plate 12 on the original hot press. The device is suitable for single-sided heating and is suitable for a hot press with two layers of hot pressing plates. The heating device 9 is suitable for the preparation process of veneered artificial boards, and melamine-impregnated film paper is pasted on multi-layer boards and blockboards through the above-mentioned hot press.

[0032] In another embodiment, the first protective layer 1 is a polystyrene with a thickness of 1 mm and an insulation resistance of 0.5 MΩ / kV, the second protective layer 5 is a polytetrafluoroethylene film with a thickness of 2 mm, and the graphene heating layer 3 is a graphene crystal with a particle size of ≤3 microns and a purity of ≥98% evenly coated on the insulating layer at a temperature of 150 g / m 2 Uniform coating; the first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV, high temperature resistance above 300℃, and 150g / m 2 Evenly apply; 3 temperature measuring elements are set.

[0033] Another embodiment, such as Figure 2 、 Figure 4 As shown, the first protective layer 1 is an upper metal heat conducting plate, and the second protective layer 5 is a lower metal heat conducting plate. The thickness of the upper metal heat conducting plate and the lower metal heat conducting plate are both ≥15mm manganese steel or carbon steel; the upper metal heat conducting plate and the lower metal heat conducting plate are respectively provided with grooves 6 on the facing surfaces, and the first insulating layer 2, the graphene heating layer 3 and the second insulating layer 4 are provided in the grooves 6. A third insulating layer (not shown in the figure) is provided between the upper metal heat conducting plate, the lower metal heat conducting plate and the graphene heating layer 3, that is, the graphene heating layer 3 is covered by the first insulating layer 2, the third insulating layer 3 and the graphene heating layer 4. The second insulating layer 4 and the third insulating layer are surrounded by it. The insulating glue used in the third insulating layer is the same as that used in the first insulating layer. The wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element pass through the third insulating layer, the upper and lower metal heat conducting plates (through hole 8) to connect to the control system; a groove 6 with a depth of ≤8mm is milled at a distance of ≥20mm from the edges of the upper and lower metal heat conducting plates; a semi-through hole A8-1 and a semi-through hole B 8-2 are respectively provided on the side walls of the groove 6 of the upper and lower metal heat conducting plates, which together constitute a through hole 8. A total of two through holes 8 are provided, which are respectively provided at both ends of the heating device 9 (i.e., the two ends of the upper and lower metal heat conducting plates). The through holes are for the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element to pass through; wire holes are drilled on the edges of the upper and lower metal heat conducting plates, the upper metal heat conducting plate is covered on the lower metal heat conducting plate, and then fixed with high-strength bolts.

[0034] The first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV to 1MΩ / kV, high temperature resistance above 300℃, and a strength of 100 to 300g / m 2 set up.

[0035] When the upper and lower metal heat conducting plates are combined, they form a cavity structure. The cavity structure contains the first insulating layer 2, the second insulating layer 4, the graphene heating layer 3, and the third insulating layer. A through hole 8 connects to the cavity structure. The wires connected to the graphene heating layer 3 and the temperature measuring element pass through the third insulating layer and through hole 8 before connecting to the control system. Two through holes 8 can be provided, one at each end of the heating device 9, to facilitate wire passage.

[0036] When one through hole 8 is provided, the through hole 8 is provided only at one end of the heating device 9, and a half groove A 7-1 and a half groove B 7-1 are provided on the side walls of the groove 6 of the upper metal heat conducting plate and the lower metal heat conducting plate, respectively. Figure 3 As shown, they together constitute a preset wire groove 7, in which the graphene heating layer 3 connecting wires and the temperature measuring element connecting wires are set. The preset wire groove 7 is connected with the through hole 8, and the end of the wire away from the through hole 8 can go around the preset wire groove 7 and pass through the through hole 8, which can facilitate the connection of the control system and effectively avoid accidents.

[0037] The gap between the upper metal heat conducting plate and the lower metal heat conducting plate is sealed with sealant.

[0038] The heating device 9 can generate heat on both sides. The heating device 9 can replace the original hot pressing plate 12 on the hot pressing machine. Figure 6 As shown, the heating device 9 provided by the present invention is used as the hot pressing plate of the hot press. During actual installation, the original hot pressing plate 12 on the hot press can be removed and the heating device 9 can be installed. The installation method is the same as the installation method of the original hot pressing plate 12. The top heating device 9 is fixedly connected to the frame 10. The two ends of the heating devices 9 at other positions are movably connected to the frame 10 of the hot press to ensure that the heating device 9 can move up and down. The bottom heating device 9 is connected to the lifting device 11 (such as a cylinder). The specific frame 10 is provided with a number of slots. The two ends of the heating device 9 are set in the slots. The two ends of each layer of heating device 9 move up and down in the slots. The heating device 9 relies on the lifting device 11 to rise. When the lifting device 11 is lowered, the heating device 9 relies on gravity to move down to the bottom position of the slot. Since the heating device 9 can heat on both sides, it is suitable for hot presses with multi-layer hot pressing plates and can be applied to the hot pressing molding process of artificial boards.

[0039] In another embodiment, the first protective layer 1 is an upper metal heat conducting plate, and the second protective layer 5 is a lower metal heat conducting plate. The thickness of the upper and lower metal heat conducting plates is 15 mm, the width is 1400 mm, and the length is 2600 mm. Carbon steel is used. A groove 6 with a depth of 5 is milled 20 mm away from the edges of the upper and lower metal heat conducting plates. The graphene heating layer 3 is a graphene crystal with a particle size of ≤3 microns and a purity of ≥98% evenly coated on the insulating layer at a rate of 100 g / m 2Uniform coating; the first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV, high temperature resistance above 300℃, and 100g / m 2 The third insulating glue is evenly coated and is the same as the insulating glue used in the first insulating layer; three temperature measuring elements are set, and through holes 8 are set at both ends of the heating device 9.

[0040] Graphene heating materials have excellent thermal conductivity. At room temperature, graphene's charge carriers (conductive ions) are 15,000 cm / (V·s), ten times higher than those of silicon and more than twice that of indium antimonide (nSb), the material with the highest known charge carrier mobility. Graphene heating requires electricity. When electricity is applied to the electrodes at both ends of the graphene heating layer 3, the carbon molecules in the heating layer generate phonons, ions, and electrons in the resistor. The resulting carbon molecular clusters rub and collide with each other, generating heat energy, also known as Brownian motion. The heat energy generated by these collisions is then uniformly radiated in a planar manner through far-infrared light with a wavelength of 5-14 microns. The graphene material's total effective electrothermal energy conversion rate exceeds 99.5%, and its superconductivity ensures stable heating performance. In the present invention, electrical energy is converted into thermal energy through the instantaneous heating characteristics of the graphene heating layer 3, avoiding the problems of high energy consumption, high risk, low heat conversion efficiency, high cost, and environmental pollution in traditional heat-providing methods such as thermal oil. It also avoids the problems of short service life, easy failure, slow heating, low heat conversion efficiency, and high cost in traditional heat-providing methods such as resistance wire and heating tube.

[0041] The utility model provides a heating device for a hot press. The heating device 9 uses graphene material to generate heat instead of the traditional heating method, avoiding the generation of CO, CO2, NO S the utility model can save more than 35% of costs; since no boiler, pressure pipe and natural gas are used, safety hazards are eliminated and the risk factor is reduced; compared with the traditional heat supply method of heat transfer oil, resistance wire and heating tube, the heat supply speed is increased, the heat conversion efficiency is improved, the cost is reduced, the service life is increased, the production efficiency is improved, the occurrence of safety accidents is avoided and the safety factor is increased; the heating device 9 can be manufactured in different specifications (such as 4×8 feet, 4×9 feet and 5×8 feet) as needed; the heating device 9 used in the hot press has been tested for 3000 hours continuously and the equipment operates normally and has a long service life.

[0042] The utility model provides a hot press heating device with a simple structure, easy installation, high heat utilization rate, low energy consumption, safety, energy saving and environmental protection, instantaneous power generation, effectively improving production efficiency and capacity, and a long service life. It can fundamentally solve the current situation of high energy consumption and high safety risks caused by the use of hot presses and is suitable for industrial production and application.

Claims

1. A heating device for a hot press, wherein the heating device (9) is arranged on the hot press, characterized in that: The heating device (9) comprises, in sequence, a first protective layer (1), a first insulating layer (2), a graphene heating layer (3), a second insulating layer (4), and a second protective layer (5); both ends of the graphene heating layer (3) are connected to a control system via wires.

2. A hot press heating device according to claim 1, characterized in that: A temperature measuring element is provided on the graphene heating layer (3), and the temperature measuring element is connected to a control system via a wire.

3. A hot press heating device according to claim 1, characterized in that: The first protective layer (1) is a polymer flexible material, and the second protective layer (5) is a flexible heat-insulating material; the heating device (9) is connected to the hot pressing plate of the hot press.

4. A hot press heating device according to claim 3, characterized in that: Structural adhesive (13) is provided on the edges of the first protective layer (1), the first insulating layer (2), the graphene heating layer (3), the second insulating layer (4), and the second protective layer (5).

5. A hot press heating device according to claim 3, characterized in that: The thickness of the first protective layer (1) is ≥1 mm, and the thickness of the second protective layer (5) is ≥2 mm.

6. A hot press heating device according to claim 1, characterized in that: The first protective layer (1) is an upper metal heat conducting plate, and the second protective layer (5) is a lower metal heat conducting plate.

7. A hot press heating device according to claim 6, characterized in that: The thickness of the upper metal heat conducting plate and the lower metal heat conducting plate are both ≥15 mm; and the heating device (9) is connected to a hot press.

8. A hot press heating device according to claim 7, characterized in that: The upper metal heat conducting plate and the lower metal heat conducting plate are respectively provided with grooves (6) on their facing surfaces, a first insulating layer (2), a graphene heating layer (3) and a second insulating layer (4) are provided in the grooves (6), and a third insulating layer is provided between the upper metal heat conducting plate, the lower metal heat conducting plate and the graphene heating layer (3); the upper metal heat conducting plate is connected to the lower metal heat conducting plate.

9. A hot press heating device according to claim 8, characterized in that: Semi-through holes are respectively provided on the side walls of the grooves (6) of the upper metal heat conducting plate and the lower metal heat conducting plate, and together they form a through hole (8).

10. A hot press heating device according to claim 9, characterized in that: When the through hole (8) is only provided at one end of the heating device (9), half grooves are respectively provided on the side walls of the grooves (6) of the upper metal heat conducting plate and the lower metal heat conducting plate, together forming a preset wire groove (7), and the preset wire groove (7) is communicated with the through hole (8).

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