Heating device and three-dimensional object forming device

Abstract

The utility model discloses a heating device and a three-dimensional object forming device, and the heating device comprises a heating device main body which is internally provided with a first heating part, a second heating part, a third heating part and a fourth heating part; the heating units are arranged in the first heating part, the second heating part, the third heating part and the fourth heating part; the energy density of the heating unit in the first heating part is greater than that of the heating unit in the second heating part, and / or the energy density of the heating unit in the first heating part is greater than that of the heating unit in the third heating part; and / or the energy density of the heating unit in the first heating part is greater than that of the heating unit in the fourth heating part. The energy density of the heating unit in the first heating part is larger than that of the heating unit in the second heating part and / or the third heating part and / or the fourth heating part, so that the influence of an airflow path on the temperature of a forming area is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a heating device and a three-dimensional object forming device. Background Art

[0002] The main process of the three-dimensional object forming method is to obtain a digital model of the three-dimensional object, slice and layer the digital model, and process and convert the data of each slice layer to obtain the printing data of each slice layer. The printing device prints layer by layer according to the slice layer printing data and stacks them to produce a three-dimensional object.

[0003] Existing three-dimensional object forming methods include inkjet printing technology and a technology combining powder and inkjet printing. The technology combining powder and inkjet printing is that the print head selectively sprays liquid material on the powder layer according to the layer printing data of the three-dimensional object to form a slice layer, which is stacked layer by layer to form a three-dimensional object. Among them, during the forming process, the heating device outputs energy to heat the powder layer, but the temperature in the powder layer and the forming chamber is prone to fluctuations. In order to ensure that the forming chamber is maintained at a stable ambient temperature, it is necessary to introduce airflow into the forming chamber for cooling. However, the cooling process may cause the temperature field of the powder layer to be unevenly distributed. If the temperature field gradient is too large, the material volume shrinkage is inconsistent, which can easily cause the three-dimensional object to deform, warp and crack, etc., seriously affecting the forming quality of the three-dimensional object. Utility Model Content

[0004] The utility model aims to provide a heating device and a three-dimensional object forming device to solve the problem of uneven temperature field of a powder layer caused by introducing airflow cooling into a forming chamber.

[0005] In a first aspect, the utility model provides a heating device for applying heat to a forming area of ​​a three-dimensional object forming device, wherein the three-dimensional object forming device comprises an air flow inlet and an air flow outlet, and an air flow path flowing from the air flow inlet to the air flow outlet is at least located on a first side of the forming area, and the heating device comprises:

[0006] A heating device body, wherein a first heating portion corresponding to a first side of the molding area, a second heating portion corresponding to a second side of the molding area, a third heating portion corresponding to a third side of the molding area, and a fourth heating portion corresponding to a fourth side of the molding area are disposed in the heating device body;

[0007] A heating unit, comprising at least one heating element, wherein the first heating part, the second heating part, the third heating part and the fourth heating part are all provided with the heating unit;

[0008] The energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the second heating section, and / or the energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the third heating section, and / or the energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the fourth heating section.

[0009] A heating device as described above, wherein preferably, the heating unit comprises at least two heating elements, the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the second heating portion, and / or the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the third heating portion, and / or the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the fourth heating portion;

[0010] and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the second heating section, and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the third heating section, and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the fourth heating section;

[0011] and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the second heating section, and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the third heating section, and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the fourth heating section;

[0012] And / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the second heating section and the molding area, and / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the third heating section and the molding area, and / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the fourth heating section and the molding area.

[0013] A heating device as described above, wherein preferably, the air flow path flowing in through the air flow inlet to flowing out of the air flow outlet is also located on the fourth side of the molding area, the energy density of the heating unit in the fourth heating section is greater than the energy density of the heating unit in the second heating section, and / or the energy density of the heating unit in the fourth heating section is greater than the energy density of the heating unit in the third heating section.

[0014] A heating device as described above, wherein preferably, the heating element comprises at least one of a first heating element and a second heating element, and the maximum power of the first heating element is less than the maximum power of the second heating element.

[0015] In the above-mentioned heating device, preferably, a first heating zone and a second heating zone are provided in the main body of the heating device, wherein:

[0016] The first heating zone corresponds to the position of the molding zone, the heating unit is arranged in the first heating zone, and the second heating zone corresponds to the position outside the molding zone;

[0017] The first heating part, the second heating part, the third heating part and the fourth heating part are all arranged in the second heating zone.

[0018] In the heating device as described above, preferably, the energy density of the heating units in the first heating zone is smaller than the energy density of the heating units in the second heating zone.

[0019] A heating device as described above, wherein, preferably, the first heating zone includes at least two first heating elements, and the at least two first heating elements are arranged at intervals; the second heating zone includes at least two first heating elements and at least four second heating elements, and the first heating element is arranged between two adjacent second heating elements.

[0020] A heating device as described above, wherein preferably, six first heating elements are provided in the first heating zone, four second heating elements are provided in the second heating zone, the four second heating elements are evenly distributed in the second heating zone, and at least one first heating element is provided between adjacent second heating elements.

[0021] The heating device as described above, preferably, further comprises a temperature sensor, wherein the temperature sensor is arranged in the first heating zone.

[0022] The heating device as described above, preferably, further comprises a controller, wherein the controller is used to control the power of the heating unit.

[0023] In a second aspect, the utility model provides a three-dimensional object forming device, comprising the aforementioned heating device.

[0024] Compared with the prior art, the utility model makes the energy density of the heating unit in the first heating part on the first side of the corresponding forming area greater than the energy density of the heating unit in the second heating part and / or the third heating part and / or the fourth heating part, so that the energy density received by the first side of the forming area close to the airflow path is greater than the energy density of the remaining sides of the forming area away from the airflow path, which is beneficial to reduce the impact of the airflow path on the temperature of the forming area, ensure uniform temperature distribution of the powder layer, and thus ensure the forming quality of the three-dimensional object. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a three-dimensional object forming device provided by an embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a heating device provided in an embodiment of the utility model;

[0027] Figure 3a-3b It is a schematic diagram of at least a portion of the structure of the main body of the heating device provided by one embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the main body of the heating device provided by one embodiment of the utility model;

[0029] Figure 5 It is a structural schematic diagram of a heating device body provided by another embodiment of the utility model;

[0030] Figure 6 It is a structural schematic diagram of a three-dimensional object forming device provided in an embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 100-heating device, 110-heating device body, 120-first heating zone, 130-second heating zone, 131-first heating part, 132-second heating part, 133-third heating part, 134-fourth heating part, 140-first heating element, 150-second heating element, 160-air flow inlet, 170-temperature sensor, 180-air flow outlet, 190-air flow path;

[0033] 200-three-dimensional object forming device, 210-forming chamber, 220-forming area, 221-first side of the forming area, 222-second side of the forming area, 223-third side of the forming area, 224-fourth side of the forming area, 230-powder supply mechanism, 231-powder spreader, 232-lifting part, 233-support plate, 234-powder storage chamber, 240-lifting mechanism, 250-control mechanism;

[0034] 300-Powder material. DETAILED DESCRIPTION

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] First, refer to Figure 1-Figure 2 As shown, the utility model provides a heating device 100, which is used to apply heat to a molding area 220 of a three-dimensional object molding device 200. The three-dimensional object molding device 200 includes an air flow inlet 160 and an air flow outlet 180. The molding area has a first side 221, a second side 222, a third side 223, and a fourth side 224. The air flow path 190 flowing in through the air flow inlet 160 to the air flow outlet 180 is at least located on the first side 221 of the molding area. The air flow cools the interior of the molding chamber 210. The heating device 100 includes a heating device body 110 and a heating unit, wherein:

[0037] Reference Figures 1 to 4 As shown, the heating device body 110 is provided with a first heating unit 131 corresponding to the first side 221 of the molding area, a second heating unit 132 corresponding to the second side 222 of the molding area, a third heating unit 133 corresponding to the third side 223 of the molding area, and a fourth heating unit 134 corresponding to the fourth side 224 of the molding area. Figure 3a , Figure 3b As shown, the first heating unit 131 is disposed on the first side of the heating device body 110 (see Figure 3a The second heating unit 132 and the third heating unit 133 are respectively disposed on the second side and the third side of the heating device body 110 (see Figure 3b The second side and the third side are arranged opposite to each other and are respectively connected to the first side. The fourth heating unit 134 is arranged on the fourth side of the heating device body 110 (refer to Figure 3a The fourth side is arranged opposite to the first side, and there may be a partial overlapping area between two adjacent heating parts.

[0038] The heating unit includes at least one heating element, and the first heating part 131, the second heating part 132, the third heating part 133, and the fourth heating part 134 are all provided with heating units. The first heating part 131, the second heating part 132, the third heating part 133, and the fourth heating part 134 all generate heat through the heating unit, thereby providing energy to the three-dimensional object forming device 200.

[0039] When the cooling airflow cools the molding chamber 210, it will affect the temperature of the powder layer. The temperature of the area close to the cooling airflow will be lower than the temperature of the area far away from the cooling airflow, which will cause uneven distribution of the temperature field of the powder layer. Therefore, it is necessary to set the energy density of the heating part corresponding to the area close to the cooling airflow to be greater than the energy density of the heating part in the area far away from the cooling airflow to ensure uniform temperature distribution of the powder layer. Technicians in this field should know that energy density refers to the amount of energy that can be radiated in a certain space.

[0040] Energy density is affected by many factors, including the arrangement of heating lamps, power of heating lamps, wavelength, propagation distance, etc. In a feasible embodiment, the heating unit includes at least two heating elements, and the distance between adjacent heating elements in the first heating part 131 is smaller than the distance between adjacent heating elements in the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134. When the energy that can be radiated by the heating element is not regulated, the corresponding energy density can be increased by reducing the distance between adjacent heating elements. Since the first side 221 of the first heating part 131 corresponding to the molding area is closer to the cooling airflow, the distance between adjacent heating elements in the first heating part 131 is set to be smaller than the distance between adjacent heating elements in the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134, so that the energy density of the first heating part 131 is greater than that of the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134, thereby reducing the influence of the cooling airflow on the powder layer, which is conducive to ensuring uniform temperature distribution of the powder layer.

[0041] In a feasible embodiment, under the above-mentioned arrangement, the power of the heating element can be further regulated so that the power of the heating unit in the first heating part 131 is greater than the power of the heating unit in the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134; in other embodiments, other arrangements can be adopted. By regulating the power of the heating unit, the corresponding energy density can be adjusted. Since the first side 221 of the molding area corresponding to the first heating part 131 is closer to the cooling airflow, the power of the heating unit in the first heating part 131 is adjusted to be greater than the power of the heating unit in the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134, so that the energy density of the first heating part 131 is greater than that of the second heating part 132 and / or the third heating part 133 and / or the fourth heating part 134, thereby reducing the influence of the cooling airflow on the powder layer, which is conducive to ensuring uniform temperature distribution of the powder layer.

[0042] In a feasible embodiment, heating elements with different wavelengths can be selected so that the wavelength of at least one heating element of the heating unit in the first heating section 131 is smaller than the wavelength of at least one heating element of the heating unit in the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134. By selecting heating elements with different wavelengths, the corresponding energy density can be adjusted. Since the first side 221 of the molding area corresponding to the first heating section 131 is closer to the cooling airflow, the wavelength of at least one heating element of the heating unit in the first heating section 131 is selected to be smaller than the wavelength of at least one heating element of the heating unit in the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134, so that the energy density of the first heating section 131 is greater than that of the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134, thereby reducing the influence of the cooling airflow on the powder layer, which is beneficial to ensure uniform temperature distribution of the powder layer.

[0043] In a feasible embodiment, the distance between the heating element and the molding area 220 can be adjusted so that the distance between the heating unit in the first heating section 131 and the molding area 220 is smaller than the distance between the heating unit in the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134 and the molding area 220. By adjusting the distance between the heating element and the molding area 220, the corresponding energy density can be adjusted. Since the first side 221 of the molding area corresponding to the first heating section 131 is closer to the cooling airflow, the distance between the heating unit in the first heating section 131 and the molding area 220 is adjusted to be smaller than the distance between the heating unit in the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134 and the molding area 220, so that the energy density of the first heating section 131 is greater than that of the second heating section 132 and / or the third heating section 133 and / or the fourth heating section 134, thereby reducing the influence of the cooling airflow on the powder layer, which is beneficial to ensure uniform temperature distribution of the powder layer.

[0044] In a feasible implementation, the airflow path 190 flowing in through the airflow inlet 160 and out of the airflow outlet 180 is also located at the fourth side 224 of the molding area, and the energy density of the heating unit in the fourth heating part 134 is greater than the energy density of the heating unit in the second heating part 132, and / or, the energy density of the heating unit in the fourth heating part 134 is greater than the energy density of the heating unit in the third heating part 133. The energy density can be adjusted by adjusting the distance between the heating elements, the power of the heating unit, the wavelength of the heating element, the distance between the heating unit and the molding area, etc., which will not be repeated here.

[0045] In a feasible implementation, the airflow path 190 flowing in through the airflow inlet 160 and out of the airflow outlet 180 may be located at the second side 222 of the molding area, the energy density of the heating unit in the second heating part 132 is greater than the energy density of the heating unit in the third heating part 133, and / or the energy density of the heating unit in the second heating part 132 is greater than the energy density of the heating unit in the fourth heating part 134. The energy density can be adjusted by adjusting the distance between the heating elements, the power of the heating unit, the wavelength of the heating element, the distance between the heating unit and the molding area, etc., which will not be repeated here.

[0046] In a feasible implementation, the airflow path 190 flowing in through the airflow inlet 160 and out of the airflow outlet 180 may be located at the third side 223 of the molding area, and the energy density of the heating unit in the third heating part 133 is greater than the energy density of the heating unit in the second heating part 132, and / or the energy density of the heating unit in the third heating part 133 is greater than the energy density of the heating unit in the fourth heating part 134. The energy density can be adjusted by adjusting the distance between the heating elements, the power of the heating unit, the wavelength of the heating element, the distance between the heating unit and the molding area, etc., which will not be repeated here.

[0047] In a feasible embodiment, the heating element includes at least one of a first heating element 140 and a second heating element 150, and the maximum power of the first heating element 140 is less than the maximum power of the second heating element 150. When two types of heating elements with different powers are used, a corresponding number of first heating elements 140 and second heating elements 150 can be selected for arrangement and distribution according to the final energy demand, so that the energy finally output by the heating device 100 can reach the powder layer evenly.

[0048] Preferably, the heating element is a heating lamp, and the first heating element 140 and the second heating element 150 are heating lamps with different maximum powers. The heat generated by the heating lamp can provide energy for the powder layer. On the one hand, the heat generated is stable, and on the other hand, when heating lamps with different powers are arranged, it is easy to operate. The heating lamp can be selected from at least one of a self-luminous diode (LED), a monochromatic lamp, an ultraviolet lamp, an infrared lamp, and a microwave transmitter. The selection of the heating lamp is related to the type of liquid material. When the liquid material undergoes a photopolymerization reaction, ultraviolet radiation can be used to provide radiation energy, and the ultraviolet radiation can be used to induce the liquid material to undergo a photopolymerization reaction; when the liquid material undergoes a thermal polymerization reaction, an infrared lamp can be used to provide thermal energy, and the thermal energy can be used to induce the liquid material to undergo a thermal polymerization reaction.

[0049] In the embodiment provided in the present application, a first heating zone 120 and a second heating zone 130 are provided in a heating device body 110, wherein: the first heating zone 120 corresponds to the position of the molding area 220, a heating unit is provided in the first heating zone 120, and the second heating zone 130 corresponds to a position outside the molding area 220; the first heating part 131, the second heating part 132, the third heating part 133 and the fourth heating part 134 are all provided in the second heating zone 130.

[0050] The first heating zone 120 corresponds to the forming area 220 of the three-dimensional object forming device 200, and mainly provides energy to the forming area 220, and the second heating zone 130 provides heat to the area outside the forming area 220. In the process of energy transmission, due to heat loss caused by conduction, convection and radiation, when the temperature of the external environment is lower than the temperature of the forming area 220, the powder material 300 near the edge of the forming area 220 will produce higher heat loss. Compared with the first heating zone 120, the energy density of the second heating zone 130 needs to be set greater than the energy density of the first heating zone 120 to compensate for the possible heat loss of the powder material 300 at the edge of the forming area 220.

[0051] In a feasible implementation, the energy density of the heating unit in the first heating zone 120 is less than the energy density of the heating unit in the second heating zone 130. The energy density can be adjusted by adjusting the distance between the heating elements, the power of the heating unit, the wavelength of the heating element, the distance between the heating unit and the molding area, etc., so that the energy density of the second heating zone 130 is greater than the energy density of the first heating zone 120, thereby achieving the second heating zone 130 to compensate for the heat loss of the edge area of ​​the first heating zone 120.

[0052] Preferably, refer to Figure 4 As shown, the first heating zone 120 includes at least two first heating elements 140, and the at least two first heating elements 140 are arranged at intervals; the second heating zone 130 includes at least two first heating elements 140 and at least four second heating elements 150, and the first heating element 140 is arranged between two adjacent second heating elements 150. Since the maximum power of the first heating element 140 is less than the maximum power of the second heating element 150, by setting the number of heating elements in the second heating zone 130 to be greater than the number of heating elements in the first heating zone 120, it is further ensured that the energy density of the second heating zone 130 is greater than the energy density of the first heating zone 120.

[0053] In a feasible implementation mode, referring to Figure 5 As shown, six first heating elements 140 are arranged in the first heating zone 120, and four second heating elements 150 are arranged in the second heating zone 130. The four heating elements are arranged at the boundary intersection of the second heating zone 130, and at least one first heating element 140 is arranged between two adjacent second heating elements 150. In other embodiments, the number of the first heating elements 140 in the first heating zone 120 can be set according to actual needs, and the number and arrangement of the first heating elements 140 and the second heating elements 150 in the second heating zone 130 can also be set according to actual needs. It is only necessary to ensure that the energy density of the first heating portion 131 in the second heating zone 130 is greater than the energy density of the second heating portion 132 and / or the third heating portion 133 and / or the fourth heating portion 134, and no limitation is made here.

[0054] The heating effect of the heating device 100 can be determined by detecting the temperature of the molding area 220. Therefore, a temperature sensor 170 is also provided in the heating device 100. The temperature sensor 170 is provided in the first heating zone 120, and is located at the center of the first heating zone 120, corresponding to the molding area 220. The temperature sensor 170 is used to monitor the temperature of the molding area 220. Through the monitoring of the temperature sensor 170, the temperature condition of the molding area 220 can be understood in time, so as to facilitate corresponding operations according to the monitored temperature.

[0055] In the embodiment provided in the present application, the arrangement of the heating units in the first heating section 131 is the same as that in the fourth heating section 134; and / or, the arrangement of the heating units in the second heating section 132 is the same as that in the third heating section 133. Two adjacent heating sections may include the same heating element. In order to ensure that the energy of the heating device 100 can reach the molding area 220 evenly, the first heating section 131 is arranged in the same manner as the fourth heating section 134, the second heating section 132 is arranged in the same manner as the third heating section 133, and the energy density of the first heating section 131 is greater than that of the second heating section 132, the third heating section 133 and / or the fourth heating section 134, thereby achieving the effect of uniform distribution of the temperature of the powder layer.

[0056] In a feasible embodiment, the heating device 100 further includes a controller, which is used to control the power of the heating unit. The controller can control the power of the heating unit according to the temperature of the molding area 220, and then control the energy output of the heating device 100, so that each heating part of the heating device 100 can output energy with a uniform temperature.

[0057] In a second aspect, the present invention provides a three-dimensional object forming device 200, comprising the aforementioned heating device 100. Figure 6 As shown, the three-dimensional object forming device 200 includes a forming platform (not shown in the figure), a heating device 100, a powder supply mechanism 230, a lifting mechanism 240, a material distribution mechanism (not shown in the figure), a preheating mechanism (not shown in the figure) and a control mechanism 250, wherein:

[0058] A forming area 220 is provided on the forming platform, and the forming area 220 is the location where the three-dimensional object is formed.

[0059] The heating device 100 applies heat to the forming area 220 so that the heat generated by the heating device 100 can evenly reach the powder layer, thereby ensuring the forming quality of the three-dimensional object.

[0060] The powder supply mechanism 230 includes a powder spreader 231, a lifting part 232, a powder storage chamber 234 and a support plate 233. The powder storage chamber 234 is used to store powder material 300. The support plate 233 is movably arranged in the powder storage chamber 234. The lifting part 232 is connected to the support plate 233. The lifting part 232 can drive the support plate 233 to rise and fall in the powder storage chamber 234. The powder spreader 231 spreads the powder material 300 in the powder storage chamber 234 into the molding area 220 to form a layer of powder material 300. The powder spreader 231 can use a powder spreading stick or a scraper. The powder supply mechanism 230 can also include a hopper and a material dropping structure. After the powder in the hopper falls to one side of the molding area 220 through the material dropping structure, the powder spreader 231 moves above the molding area 220 to spread the powder on the molding area 220.

[0061] In the embodiment provided in the present application, a single powder storage chamber 234 is used to store the powder material 300, which can reduce the volume of the device, but can only supply powder in a single direction. The user can set the number of powder storage chambers 234 according to actual needs, which is not limited here.

[0062] In a feasible implementation, a powder storage chamber 234 is provided on each side of the molding platform to realize two-way powder supply, which is beneficial to improve molding efficiency. The powder storage chamber 234 can also be provided in other positions as long as it can supply powder to the molding platform.

[0063] The lifting mechanism 240 is connected to the platform of the molding area 220 and is used to drive the lifting of the platform of the molding area 220 .

[0064] The material dispensing mechanism is an inkjet print head, which can be a single-channel print head or a multi-channel print head. The number of print heads depends on the type of liquid material used and the amount of liquid material to be applied. For example, when the liquid material includes functional materials of different colors, liquid materials of different colors are sprayed through different print heads or different channels of the same print head. When the amount of liquid material to be applied is large and the volume of a single ink droplet is insufficient to meet the demand, in order to improve printing efficiency, multiple print heads or multiple channels can be used simultaneously to spray the same type of material.

[0065] The preheating mechanism may be disposed above the molding platform to provide radiation energy or heat energy to preheat the molding area 220, thereby facilitating the solidification of the liquid material in the molding area 220 and the powder material 300 in contact with the liquid material to form a slice layer of a three-dimensional object. The preheating mechanism may be selected from at least one of an ultraviolet lamp, an infrared lamp, a microwave transmitter, a heating wire, a heating sheet, and a heating plate. The selection of the preheating mechanism is related to the type of the liquid material and / or the powder material 300. When the liquid material and / or the powder material 300 undergoes a photopolymerization reaction, ultraviolet radiation may be used to provide radiation energy, and the liquid material and / or the powder material 300 may be induced to undergo a photopolymerization reaction by ultraviolet radiation; when the liquid material and / or the powder material 300 undergoes a thermal polymerization reaction, a component that provides thermal energy, such as an infrared lamp, a microwave, a heating wire, a heating sheet, and a heating plate may be used to induce the liquid material and / or the powder material 300 to undergo a thermal polymerization reaction by thermal energy.

[0066] The control mechanism 250 is used to control the operation of at least one of the heating device 100, the powder supply mechanism 230, the material distribution mechanism, the temperature sensor 170, and the preheating mechanism. In a feasible implementation, the temperature sensor 170 feeds back the monitored temperature to the control mechanism 250, and the control mechanism 250 controls the amount of energy provided by the heating device 100 according to the information fed back by the temperature sensor 170. The control mechanism 250 can be an electronic device such as a computer, a server, or a workstation, or a processing device set in the three-dimensional printing device, such as a CPU, MCU, SOC, or other processor.

[0067] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above are only preferred embodiments of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A heating device for applying heat to a forming area of ​​a three-dimensional object forming device, wherein the three-dimensional object forming device comprises an air flow inlet and an air flow outlet, wherein an air flow path from the air flow inlet to the air flow outlet is at least located on a first side of the forming area, and the heating device comprises: A heating device body, wherein a first heating portion corresponding to a first side of the molding area, a second heating portion corresponding to a second side of the molding area, a third heating portion corresponding to a third side of the molding area, and a fourth heating portion corresponding to a fourth side of the molding area are disposed in the heating device body; A heating unit, comprising at least one heating element, wherein the first heating part, the second heating part, the third heating part and the fourth heating part are all provided with the heating unit; Features: The energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the second heating section, and / or the energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the third heating section, and / or the energy density of the heating unit in the first heating section is greater than the energy density of the heating unit in the fourth heating section.

2. The heating device according to claim 1, characterized in that The heating unit comprises at least two heating elements, the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the second heating portion, and / or the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the third heating portion, and / or the distance between adjacent heating elements in the first heating portion is smaller than the distance between adjacent heating elements in the fourth heating portion; and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the second heating section, and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the third heating section, and / or, the power of the heating unit in the first heating section is greater than the power of the heating unit in the fourth heating section; and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the second heating section, and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the third heating section, and / or, the wavelength of at least one heating element of the heating unit in the first heating section is smaller than the wavelength of at least one heating element of the heating unit in the fourth heating section; And / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the second heating section and the molding area, and / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the third heating section and the molding area, and / or, the distance between the heating unit in the first heating section and the molding area is smaller than the distance between the heating unit in the fourth heating section and the molding area.

3. The heating device according to claim 1, characterized in that: The air flow path flowing in through the air flow inlet and out through the air flow outlet is also located on the fourth side of the molding area, the energy density of the heating unit in the fourth heating section is greater than the energy density of the heating unit in the second heating section, and / or the energy density of the heating unit in the fourth heating section is greater than the energy density of the heating unit in the third heating section.

4. The heating device according to claim 1, characterized in that The heating element includes at least one of a first heating element and a second heating element, and a maximum power of the first heating element is less than a maximum power of the second heating element.

5. The heating device according to claim 4, characterized in that: The heating device body is provided with a first heating zone and a second heating zone, wherein: The first heating zone corresponds to the position of the molding zone, the heating unit is arranged in the first heating zone, and the second heating zone corresponds to the position outside the molding zone; The first heating part, the second heating part, the third heating part and the fourth heating part are all arranged in the second heating zone.

6. The heating device according to claim 5, characterized in that: The energy density of the heating units in the first heating zone is less than the energy density of the heating units in the second heating zone.

7. The heating device according to claim 6, characterized in that: The first heating zone includes at least two first heating elements, and the at least two first heating elements are arranged at intervals; The second heating zone includes at least two first heating elements and at least four second heating elements, and the first heating element is disposed between two adjacent second heating elements.

8. The heating device according to claim 7, characterized in that: Six first heating elements are arranged in the first heating zone, four second heating elements are arranged in the second heating zone, the four second heating elements are evenly distributed in the second heating zone, and at least one first heating element is arranged between adjacent second heating elements.

9. The heating device according to claim 5, characterized in that: It also includes a temperature sensor, which is arranged in the first heating zone.

10. The heating device according to claim 9, characterized in that A controller is also included, and the controller is used to control the power of the heating unit.

11. A three-dimensional object forming device, characterized in that: A heating device comprising any one of claims 1 to 10.

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