A heating device and a 3D printing apparatus comprising the same

Abstract

The utility model relates to 3D printing equipment technical field, especially a kind of heating device and containing its 3D printing equipment, including heating plate, external heater and circulation control pipeline, heating plate is located in the inside of printing set machine and is connected with base plate, external heater is used to pass into heat conducting oil and heat heat conducting oil to form constant-temperature oil, circulation control pipeline controls constant-temperature oil circulation flow between external heater and heating plate. Constant-temperature oil is circulated by the constant-temperature oil and circulation control pipeline generated by external heater to realize constant-temperature heating to heating plate, heating plate is used to heat base plate by heat exchange, ensure that heat is continuously and uniformly transferred from external heater to base plate, replace the existing resistance wire and thermocouple heating mode, avoid the uneven stress release of printing piece caused by local overheating, solve the problem that the uneven stress release of printing piece caused by temperature feedback delay of the heating mode of existing printing equipment affects the quality of production product.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing equipment technology, and in particular to a heating device and a 3D printing equipment containing the same. Background Technology

[0002] 3D printing technology, as a rapid prototyping technology, builds three-dimensional solids by stacking materials layer by layer. It is widely used in industrial manufacturing, aerospace, medical and other fields. Its printing accuracy and product quality are closely related to the heating control of the substrate.

[0003] The existing heating method of 3D printers generally uses resistance wire heating, which has obvious defects: poor temperature control accuracy, easy to have uneven temperature and excessive temperature; and because there is a time interval in the temperature feedback of thermocouples, the actual temperature is often more than 20 degrees higher than the design value, resulting in uneven stress release of 3D printed parts, which in turn leads to poor product quality.

[0004] Therefore, there is an urgent need to design a heating device that can improve the quality of products produced by 3D printing equipment. Utility Model Content

[0005] In view of this, the present invention provides a heating device and a 3D printing equipment containing the same, to solve the problem of poor product quality produced by existing 3D printing equipment.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is to provide a heating device, the heating device comprising: A heating plate, which is disposed inside the printer and connected to the substrate; An external heater, wherein the external heater is used to introduce heat transfer oil and heat the heat transfer oil to form a constant-temperature oil; and A circulation control pipeline is provided, which is connected to the external heater and the heating plate respectively, and controls the constant temperature oil to circulate between the external heater and the heating plate so that the heat transfer oil heats the heating plate.

[0007] As an embodiment of this utility model, the external heater includes a heating wire, and a receiving cavity is provided inside the external heater. The receiving cavity is used to introduce the heat-conducting oil, and the heating wire is disposed in the receiving cavity and heats the introduced heat-conducting oil to form the constant temperature oil.

[0008] As an embodiment of this utility model, the circulation control pipeline includes an oil inlet pipeline, an oil return pipeline, and a circulation pump. The oil inlet pipeline is connected to the receiving cavity and the heating plate, the oil return pipeline is connected to the heating plate and the circulation pump, and the circulation pump is connected to the oil return pipeline and the receiving cavity, so that the constant temperature oil circulates between the receiving cavity and the heating plate.

[0009] As an embodiment of this utility model, the heating device further includes an oil inlet valve and an oil return valve. The oil inlet valve is located in the oil inlet pipe, and the oil return valve is located in the oil return pipe and between the heating plate and the circulating pump.

[0010] As an embodiment of this utility model, the external heater further includes a temperature control device, which is electrically connected to the heating wire and controls the heating temperature of the heating wire.

[0011] As an embodiment of this utility model, the external heater further includes a detection device, which is disposed in the oil inlet pipe and located between the oil inlet valve and the receiving cavity. The detection device is used to detect the temperature of the constant temperature oil in the oil inlet pipe and send a temperature signal to the temperature control device.

[0012] As an embodiment of the present invention, the heating device further includes a draining device, which is connected to the receiving cavity and is used to drain impurities or aged waste oil deposited inside the receiving cavity.

[0013] As an embodiment of the present invention, the heating device further includes an oil tank and a refueling device. The oil tank is used to store the heat transfer oil, and the refueling device is connected to the oil tank and the receiving cavity respectively, so that the heat transfer oil can be introduced from the oil tank into the receiving cavity.

[0014] As an embodiment of the present invention, the heating device further includes an exhaust device, which is disposed in the oil inlet pipe and is used to exhaust the air remaining in the oil inlet pipe.

[0015] To solve the above-mentioned technical problems, this utility model also provides a 3D printing device, which includes the heating device and printer mentioned above. The printer has a substrate inside for supporting the printed object, and the heating plate is attached to the substrate.

[0016] Compared with the prior art, the heating device and 3D printing equipment containing the present invention provided have the following advantages: 1. The heating device provided by this utility model produces constant-temperature oil through an external heater. The constant-temperature oil circulates through a circulation control pipeline to heat the heating plate at a constant temperature. The heating plate then heats the substrate inside the printer through heat exchange, ensuring that heat is continuously and evenly transferred from the external heater to the substrate. This replaces the existing resistance wire and thermocouple heating methods, avoiding uneven stress release in 3D printed parts due to local overheating. It solves the problem that the temperature feedback delay in the heating method of existing 3D printing equipment leads to uneven stress release in printed parts, which affects the quality of the produced products.

[0017] 2. In the heating device provided by this utility model, a cavity is provided to store and heat the heat transfer oil, so that the heating wire directly heats the heat transfer oil in the cavity, replacing the existing method of indirect heating of the heating plate by resistance wire. This can improve the heat transfer efficiency and precisely adjust the heating temperature, providing a basis for the temperature stability of the constant temperature oil. In addition, the cavity can also prevent medium leakage or external impurities from entering, ensuring the purity of the heating medium and extending the service life of the device.

[0018] 3. In the heating device provided by this utility model, by setting up a bidirectional path of oil inlet pipe and oil return pipe, and setting up a circulation pump to provide circulation power, the circulation pump drives the medium to flow rapidly, which can reduce the heat loss of constant temperature oil in the pipe, ensure that the heat of constant temperature oil generated by the external heater is transferred to the heating plate to the maximum extent, reduce energy waste, avoid local overheating caused by slow medium flow rate, and at the same time ensure that the constant temperature oil flows without dead angles between the heating plate and the external heater, avoiding hot spots or cold spots on the heating plate due to medium stagnation. Therefore, it solves the problems of uneven temperature and discontinuous heat transfer in existing resistance wire heating.

[0019] 4. In the heating device provided by this utility model, the path of the constant temperature oil entering the heating plate is controlled by the oil inlet valve, and the path of the constant temperature oil flowing back from the heating plate to the circulation pump is controlled by the oil return valve. This increases the on / off control function of the circulation pipeline. When it is necessary to clean the pipeline, replace the constant temperature oil, or repair the heating plate and external heater, the flow of constant temperature oil can be cut off by closing the oil inlet valve and the oil return valve, which reduces the difficulty and cost of maintenance. It also allows the valve to be quickly closed to cut off the circulation if there is an abnormality in the circulation pipeline, such as leakage or blockage, to prevent the accident from escalating and improve the safety of the heating device.

[0020] 5. In the heating device provided by this utility model, the heating wire power can be adjusted according to the preset temperature through the temperature control device to prevent the heat transfer oil from being overheated, thus solving the defect of temperature control lag in the prior art. It can also flexibly control the temperature of the constant temperature oil to meet the temperature requirements of substrates of different materials and improve the versatility of the heating device.

[0021] 6. In the heating device provided by this utility model, a detection device is installed between the oil inlet valve and the receiving cavity. It can collect the actual temperature of the constant temperature oil in the oil inlet pipe in real time and ensure that the monitored constant temperature oil temperature is just output from the external heater. The data is closer to the actual heating temperature of the heating plate. The temperature signal is fed back to the temperature control device, so that the temperature control device can dynamically adjust the heating wire power according to the actual temperature, avoiding blind adjustment. Even if the external ambient temperature changes, such as the temperature difference in the workshop, the temperature of the constant temperature oil can be maintained by real-time adjustment, avoiding temperature fluctuations from affecting the printing quality and improving the temperature control stability of the heating device.

[0022] 7. In the heating device provided by this utility model, the drain device is directly connected to the receiving cavity, which can regularly discharge the impurities or aged waste oil deposited inside the receiving cavity, avoid the blockage of the circulation pipe by impurities, which would cause poor flow of constant temperature oil and abnormal local temperature of the heating plate, ensure the long-term stable operation of the heating device, and also extend the replacement cycle of the heat transfer oil and reduce the cost of consumables.

[0023] 8. In the heating device provided by this utility model, an oil tank is provided to provide a spare storage space for heat transfer oil, and a refueling device is provided to connect the oil tank with the external heater cavity. When the liquid level of the heat transfer oil in the cavity is insufficient due to evaporation and loss, it can be quickly replenished from the oil tank through the refueling device, so as to avoid heating interruption due to insufficient medium, improve the continuous working capacity of the equipment, and the dedicated refueling device reduces the mixing of impurities during the replenishment process, ensuring that the heat transfer oil is always kept clean and avoiding the impact of medium contamination on heating accuracy or blockage of pipes.

[0024] 9. In the heating device provided by this utility model, the residual air in the oil inlet pipe is discharged through the exhaust device, so as to avoid the air forming air resistance in the pipe and causing the constant temperature oil to flow poorly in the oil inlet pipe, thereby preventing the heating plate from obtaining enough constant temperature oil in some areas, thus improving the circulation heating efficiency of the heating device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] in: Figure 1 A schematic diagram of the heating device provided in Embodiment 1 of this utility model is shown; Figure 2 This diagram illustrates the application scenario structure of the heating device provided in Embodiment 1 of this utility model. Figure 3A schematic diagram of the structure of the 3D printing equipment provided in Embodiment 2 of this utility model is shown.

[0027] Explanation of reference numerals in the attached diagram: 1. Heating device; 11. Heating plate; 12. External heater; 121. Heating wire; 122. Detection device; 13. Circulation control pipeline; 131. Oil inlet pipeline; 132. Oil return pipeline; 133. Circulation pump; 134. Oil inlet valve; 135. Oil return valve; 14. Sewage discharge device; 15. Oil tank; 16. Refueling device; 17. Exhaust device; 2. 3D printing equipment; 21. Printer; 22. Substrate. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that terms such as “comprising,” “including,” or “having” specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0031] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of this invention and its embodiments and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0032] Furthermore, the terms "set up," "equipped with," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0033] Example 1 Please combine Figure 1 and Figure 2 As shown in the figure, an embodiment of the present invention discloses a heating device 1, which includes a heating plate 11, an external heater 12, and a circulation control pipe 13. The heating plate 11 is disposed inside the printer and connected to the substrate 22. The external heater 12 is used to introduce heat transfer oil and heat the heat transfer oil to form a constant temperature oil. The circulation control pipe 13 is connected to the external heater 12 and the heating plate 11 respectively, and controls the constant temperature oil to circulate between the external heater 12 and the heating plate 11 so that the heat transfer oil heats the heating plate 11.

[0034] It is understood that this utility model produces constant-temperature oil through an external heater 12, and achieves constant-temperature oil circulation through a circulation control pipe 13 to heat the heating plate 11 at a constant temperature. The heating plate 11 then heats the substrate 22 inside the printer 21 through heat exchange, ensuring that heat is continuously and evenly transferred from the external heater 12 to the substrate 22. This replaces the existing resistance wire and thermocouple heating methods, avoids uneven stress release of 3D printed parts due to local overheating, and solves the problem that the heating method of existing printing equipment has a temperature feedback delay that leads to uneven stress release of printed parts, which affects the quality of the produced products.

[0035] Specifically, the heating plate 11 has a water-cooled plate-like structure with a serpentine channel inside for holding constant temperature oil, which can increase the contact area between the constant temperature oil and the heating plate 11, ensuring uniform heat transfer. The heating plate 11 is fixed inside the printer 21 and its upper surface is in close contact with the substrate 22 of the printing equipment, transferring heat to the substrate 22 through surface contact to ensure heat conduction efficiency.

[0036] Specifically, the external heater 12 is a constant temperature oil bath heater with a closed cavity inside to store heat transfer oil. The external heater 12 can stably control the temperature of the heat transfer oil within a range of ±0.1℃ by heating the heat transfer oil, thus forming a constant temperature oil that meets the heating requirements of the substrate 22.

[0037] Specifically, the circulation control pipe 13 is a high-temperature resistant sealed pipe that can adapt to the working temperature of the constant temperature oil and prevent leakage. Its two ends are connected to the oil outlet and oil return port of the external heater 12 and the inlet and outlet of the serpentine channel of the heating plate 11 through sealed interfaces, thereby forming a closed circulation path between the external heater 12 and the heating plate 11. The circulation control pipe 13 can control the constant temperature oil to continuously circulate along the path of the external heater 12, the heating plate 11, and the external heater 12, so that the constant temperature oil can uniformly heat the heating plate 11 through heat conduction.

[0038] Furthermore, the external heater 12 includes a heating wire 121, and the external heater 12 has a receiving cavity inside, the receiving cavity is used to introduce the heat-conducting oil, the heating wire 121 is disposed in the receiving cavity and heats the introduced heat-conducting oil to form the constant temperature oil.

[0039] Specifically, the external heater 12 has a closed cavity inside to prevent leakage of the heat transfer oil. The cavity is used to store a sufficient amount of heat transfer oil, which can be a special heat transfer medium with excellent thermal stability to avoid high-temperature aging. The heating wire 121 is a high-temperature resistant alloy heating wire 121, which is fixed on the inner wall of the cavity and can directly contact the heat transfer oil to reduce heat loss to the outside. The distribution density of the heating wire 121 is adapted to the shape of the cavity to ensure that the heat transfer oil is heated evenly. The heating wire 121 heats the heat transfer oil introduced into the cavity by being energized, so that the temperature of the heat transfer oil is stabilized within a preset range and a constant temperature oil is formed. The heating power of the heating wire 121 can be adjusted by a subsequent temperature control device.

[0040] Furthermore, the circulation control pipeline 13 includes an oil inlet pipeline 131, an oil return pipeline 132, and a circulation pump 133. The oil inlet pipeline 131 is connected to the receiving cavity and the heating plate 11, respectively. The oil return pipeline 132 is connected to the heating plate 11 and the circulation pump 133, respectively. The circulation pump 133 is connected to the oil return pipeline 132 and the receiving cavity, so that the constant temperature oil circulates between the receiving cavity and the heating plate 11.

[0041] Specifically, both the return oil pipe 132 and the inlet oil pipe 131 can be flexible high-temperature resistant hoses to facilitate equipment assembly and maintenance. One end of the inlet oil pipe 131 is connected to the oil outlet of the receiving cavity through a sealing joint, and the other end is connected to the inlet of the serpentine channel of the heating plate 11 through a sealing joint, for transporting the constant-temperature oil generated by the external heater 12 to the heating plate 11. One end of the return oil pipe 132 is connected to the outlet of the serpentine channel of the heating plate 11, and the other end is connected to the inlet of the high-temperature resistant circulating pump 133. The outlet of the high-temperature resistant circulating pump 133 is connected to the return oil port of the receiving cavity through a sealing joint, and the power of the circulating pump 133 is adapted to the inner diameter of the circulating pipe and the viscosity of the constant-temperature oil, so as to provide stable power to drive the constant-temperature oil to flow along the closed-loop path of the receiving cavity, the inlet oil pipe 131, the serpentine channel, the return oil pipe 132, the circulating pump 133, and the receiving cavity, thereby improving the circulation stability of the heating device 1.

[0042] Furthermore, the heating device 1 also includes an oil inlet valve 134 and an oil return valve 135. The oil inlet valve 134 is located in the oil inlet pipe 131, and the oil return valve 135 is located in the oil return pipe 132 and between the heating plate 11 and the circulating pump 133.

[0043] Specifically, both the inlet valve 134 and the return valve 135 can be selected as manual shut-off valves or electromagnetic shut-off valves to adapt to different operating requirements. The inlet valve 134 is located near the oil outlet of the receiving cavity in the inlet pipe 131 and is used to control the opening and closing of the inlet pipe 131. The return valve 135 is located in the return pipe 132 and between the serpentine channel outlet of the heating plate 11 and the circulation pump 133, and is used to control the opening and closing of the return pipe 132. The inner walls of the valve bodies of both the inlet valve 134 and the return valve 135 are equipped with high-temperature resistant sealing gaskets to prevent leakage of the constant temperature oil. The valve diameter matches the inner diameter of the corresponding pipe to avoid obstruction of constant temperature oil flow due to valve throttling. When maintenance is required, such as cleaning the pipe or replacing the heating plate 11, closing the inlet valve 134 and the return valve 135 can cut off the constant temperature oil circulation, improving the convenience of maintenance of the heating device 1.

[0044] Furthermore, the external heater 12 also includes a temperature control device, which is electrically connected to the heating wire 121 and controls the heating temperature of the heating wire 121.

[0045] Specifically, the temperature control device is electrically connected to the heating wire 121 via a wire. The temperature control device can preset multiple target temperatures to adapt to the temperature requirements of the substrate 22 of different 3D printing materials. Based on the preset temperature or the actual temperature signal fed back by the detection device 122, the device dynamically adjusts the current and heating power of the heating wire 121. For example, when the temperature of the constant temperature oil is detected to be lower than the preset value, the power of the heating wire 121 is increased; when the temperature is higher than the preset value, the power of the heating wire 121 is reduced or cut off to avoid overheating of the heat transfer oil.

[0046] Furthermore, the external heater 12 also includes a detection device 122, which is disposed in the oil inlet pipe 131 and located between the oil inlet valve 134 and the receiving cavity. The detection device 122 is used to detect the temperature of the constant temperature oil in the oil inlet pipe 131 and send a temperature signal to the temperature control device.

[0047] Specifically, the detection device 122 can be a high-precision platinum resistance temperature sensor with a temperature measurement accuracy of ±0.05℃. The temperature sensor is fixed to the oil inlet pipe 131 via a threaded interface or clamp and is located between the oil inlet valve 134 and the receiving cavity. This ensures that the temperature of the constant-temperature oil just output from the external heater 12 is detected, and the data is closer to the actual heating temperature of the heating plate 11. The signal output terminal of the temperature sensor is connected to the signal input terminal of the temperature control device via a shielded wire. This allows for real-time acquisition of the temperature data of the constant-temperature oil in the oil inlet pipe 131 and the conversion of the temperature signal into an electrical signal, which is then transmitted to the temperature control device. After receiving the signal, the temperature control device compares it with the preset temperature and then adjusts the power of the heating wire 121.

[0048] Furthermore, the heating device 1 also includes a drain device 14, which is connected to the receiving cavity and is used to drain impurities or aged waste oil deposited inside the receiving cavity.

[0049] Specifically, the drain device 14 can be a drain port assembly with a shut-off valve. The drain port is located at the bottom of the receiving cavity of the external heater 12 and is connected to the inside of the receiving cavity through a short pipe. The shut-off valve is made of high-temperature resistant stainless steel and has a sealing gasket on its inner wall to ensure the sealing of the receiving cavity when closed. After long-term use of the equipment, the oil inlet valve 134 and the oil return valve 135 can be closed, and the drain device 14 can be opened to discharge the impurities deposited at the bottom of the receiving cavity, such as residues or aged waste oil produced by the aging of heat transfer oil. After the drain is completed, the drain device 14 is closed and new heat transfer oil is added through the subsequent oiling device 16 to avoid impurities clogging the circulation pipes or affecting the heating accuracy, thus extending the service life of the equipment.

[0050] Furthermore, the heating device 1 also includes an oil tank 15 and a refueling device 16. The oil tank 15 is used to store the heat transfer oil, and the refueling device 16 is connected to the oil tank 15 and the receiving cavity respectively, so that the heat transfer oil flows from the oil tank 15 into the receiving cavity.

[0051] Specifically, the oil tank 15 is a sealed oil storage container used to provide backup heat transfer oil. The outer wall of the oil tank 15 is provided with a transparent liquid level observation window, which allows for easy and intuitive viewing of the remaining oil level. The top of the oil tank 15 is provided with a vent valve to balance the air pressure inside and outside the oil tank 15 and prevent negative pressure from forming during refueling. The refueling device 16 includes a refueling pipe with a one-way valve and a sealing cap. One end of the refueling pipe is connected to the oil outlet of the oil tank 15 through a sealing joint, and the other end is connected to the top refueling port of the external heater 12's receiving cavity through a sealing joint. The one-way valve directs the flow from the oil tank 15 to the receiving cavity, preventing the constant temperature oil in the receiving cavity from flowing back into the oil tank 15. The sealing cap is threaded, ensuring the sealing of the refueling port when closed. When the liquid level of the heat transfer oil in the receiving cavity is insufficient due to evaporation, sewage discharge, etc., the vent valve of the oil tank 15 and the control switch on the refueling pipe are opened, and the heat transfer oil can flow from the oil tank 15 into the receiving cavity under the action of gravity, which can improve the continuity of the heating device 1's operation.

[0052] Furthermore, the heating device 1 also includes an exhaust device 17, which is located in the oil inlet pipe 131 and is used to exhaust the air remaining in the oil inlet pipe 131.

[0053] Specifically, the exhaust device 17 is an exhaust port with a one-way valve. The exhaust port is connected to the oil inlet pipe 131 near the oil outlet of the receiving cavity via a short pipe. The oil inlet pipe 131 is the starting point of the constant temperature oil flow, which can prevent air from accumulating here. The exhaust direction of the one-way valve is from the inside of the pipe to the outside, which can prevent outside air from entering the oil inlet pipe 131. When the equipment is first filled with oil or restarted after maintenance, air may remain in the oil inlet pipe 131 and the receiving cavity, which will cause the constant temperature oil circulation to be blocked, resulting in air resistance or uneven local temperature of the heating plate 11. By opening the exhaust valve and starting the circulation pump 133, the air in the pipe can flow with the constant temperature oil to the exhaust port and be discharged. When the constant temperature oil continues to flow out of the exhaust port and there are no air bubbles, the exhaust device 17 is closed, which can ensure that there is no air residue in the oil inlet pipe 131, and ensure that the constant temperature oil flows smoothly so that the heating plate 11 is heated evenly.

[0054] Example 2 The second embodiment of this utility model discloses a 3D printing device 2. Please refer to [link / reference]. Figure 3 As shown, the 3D printing equipment 2 includes the heating device 1 and the printer 21 in Embodiment 1. The printer 21 has a substrate 22 inside for supporting the printed object, and the heating plate 11 is attached to the substrate 22.

[0055] Specifically, the heating device 1 is located on the outside of the printer 21. The substrate 22 is a rectangular metal plate, which can be an aluminum alloy metal plate with good thermal conductivity. It is horizontally fixed on the worktable of the printer 21 to support the material accumulation during the 3D printing process to form the printed object. The heating plate 11 of the heating device 1 is fixed to the bottom of the substrate 22 by bolts or clips, and the upper surface of the heating plate 11 is in close contact with the lower surface of the substrate 22 to ensure that the heat is evenly transferred to the substrate 22. During operation, the heating device 1 heats the substrate 22 through constant temperature oil circulation, so that the temperature of the substrate 22 is stabilized at a preset value, which solves the problems of uneven temperature and uneven stress release of the substrate 22 in the existing resistance wire heating method, and improves the forming quality of the 3D printed parts.

[0056] The 3D printing device 2 provided in the second embodiment of this utility model has the same function as the heating device 1 provided in the first embodiment, and will not be described again here.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A heating device, characterized in that: The heating device includes A heating plate, which is disposed inside the printer and connected to the substrate; An external heater is used to introduce heat transfer oil and heat the heat transfer oil to form a constant temperature oil. as well as A circulation control pipeline is provided, which is connected to the external heater and the heating plate respectively, and controls the constant temperature oil to circulate between the external heater and the heating plate so that the heat transfer oil heats the heating plate.

2. The heating device according to claim 1, characterized in that: The external heater includes a heating wire and has a cavity inside for introducing the heat-conducting oil. The heating wire is located inside the cavity and heats the introduced heat-conducting oil to form the constant-temperature oil.

3. The heating device according to claim 2, characterized in that: The circulation control pipeline includes an oil inlet pipeline, an oil return pipeline, and a circulation pump. The oil inlet pipeline is connected to the receiving cavity and the heating plate, respectively. The oil return pipeline is connected to the heating plate and the circulation pump, respectively. The circulation pump is connected to the oil return pipeline and the receiving cavity, so that the constant temperature oil circulates between the receiving cavity and the heating plate.

4. The heating device according to claim 3, characterized in that: The heating device further includes an oil inlet valve and an oil return valve. The oil inlet valve is located in the oil inlet pipe, and the oil return valve is located in the oil return pipe and between the heating plate and the circulating pump.

5. The heating device according to claim 4, characterized in that: The external heater also includes a temperature control device, which is electrically connected to the heating wire and controls the heating temperature of the heating wire.

6. The heating device according to claim 5, characterized in that: The external heater also includes a detection device, which is located in the oil inlet pipe and between the oil inlet valve and the receiving cavity. The detection device is used to detect the temperature of the constant temperature oil in the oil inlet pipe and send a temperature signal to the temperature control device.

7. The heating device according to claim 2, characterized in that: The heating device also includes a draining device, which is connected to the receiving cavity and is used to drain impurities or aged waste oil deposited inside the receiving cavity.

8. The heating device according to claim 3, characterized in that: The heating device also includes an oil tank and a refueling device. The oil tank is used to store the heat transfer oil, and the refueling device is connected to the oil tank and the receiving cavity respectively, so that the heat transfer oil can be introduced from the oil tank into the receiving cavity.

9. The heating device according to claim 3, characterized in that: The heating device also includes an exhaust device, which is located in the oil inlet pipe and is used to expel residual air from the oil inlet pipe.

10. A 3D printing device, characterized in that: The 3D printing equipment includes a heating device and a printer as described in any one of claims 1-9, wherein the printer has a substrate inside for supporting the printed object, and the heating plate is attached to and connected to the substrate.

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