Heating lamp and heating lamp set for preheating 3D printing powder

Abstract

A heating lamp for preheating 3D printing powder comprises a lamp tube (10), a gold plating layer (20) and a lampshade (30). The lamp tube can emit heat radiation light when powered on. The gold plating layer is formed on the back side of the lamp tube along the first direction (D1). The first direction is perpendicular to the length direction (L) of the lamp tube. The gold plating layer can reflect heat radiation light emitted by the lamp tube. The lampshade is of an integrated structure made of transparent materials and is provided with an inner cavity (31). The lamp tube is arranged in the inner cavity. An air outlet pipe (32) and an air inlet pipe (33) which are communicated with the inner cavity are arranged at the two ends of the lampshade in the length direction respectively. Cooling air flow can enter the inner cavity from the air inlet pipe and flow out from the air outlet pipe to cool the gold-plated layer. The lamp tube is provided with a wiring cable. The wiring cable extends out of the lampshade to be connected with an external power supply circuit. The heating lamp can effectively cool the gold-plated layer, is beneficial to improving the temperature distribution uniformity, has an integrated structure, and is simple in manufacturing process and low in production cost. The utility model further provides a heating lamp set.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a heating lamp for preheating 3D printing powder and a heating lamp group comprising the heating lamp. Background Art

[0002] SLS (Selective Laser Sintering) technology uses infrared laser as energy source and powder material as modeling material. During the processing, the powder is first preheated to a temperature slightly lower than its melting point, and then the powder is flattened under the action of the powder scraping mechanism. Then the laser beam selectively sintered according to the layered cross-section information under computer control. After each layer is sintered, the bottom of the barrel will drop a distance of the powder layer thickness, and then a new powder layer will be laid on the bottom of the barrel for sintering. After all sintering is completed, remove the excess powder to get a sintered part.

[0003] Before laser sintering powder, industrial-grade SLS 3D printers need to preheat the powder spread on the work platform using the thermal radiation emitted by a heating lamp to obtain better sintering quality and shorter molding time.

[0004] The powder preheating stage requires a temperature field with uniform temperature distribution to control the temperature of the printing area. The temperature distribution is determined by three factors: the power and wavelength of the heating lamp and the reflection angle of the gold-plated layer. Among these three factors, the power and wavelength of the heating lamp are relatively stable, while the gold-plated layer on the outside of the heating lamp tube is easily detached due to long-term high-temperature oxidation, external foreign matter adsorption, and human damage, which changes the reflection angle of the gold-plated layer and causes uneven temperature distribution. Summary of the invention

[0005] The purpose of the utility model is to provide a heating lamp for preheating 3D printing powder, which is beneficial to prevent the gold plating layer from falling off, so as to improve the uniformity of temperature distribution during the process of preheating 3D printing powder.

[0006] Another object of the utility model is to provide a heating lamp group including the above-mentioned heating lamp, which is helpful to prevent the gold plating layer from falling off, so as to improve the uniformity of temperature distribution during the process of preheating 3D printing powder.

[0007] The utility model provides a heating lamp for preheating 3D printing powder, comprising a lamp tube, a gold-plated layer and a lampshade. The lamp tube can emit heat radiation light when powered on. The gold-plated layer is formed on the back side of the lamp tube along a first direction, and the first direction is perpendicular to the length direction of the lamp tube. The gold-plated layer can reflect the heat radiation light emitted by the lamp tube. The lampshade is an integrated structure made of a transparent material and has an inner cavity. The lamp tube is arranged in the inner cavity. An air outlet pipe and an air inlet pipe connected to the inner cavity are respectively provided at both ends of the lampshade along the length direction. A cooling airflow can enter the inner cavity from the air inlet pipe and flow out from the air outlet pipe to cool the gold-plated layer. The lamp tube has a wiring cable. The wiring cable extends out of the lampshade to connect to an external power supply circuit.

[0008] The heating lamp is obtained by configuring the lampshade as an integrated structure and arranging the lamp tube in the inner cavity of the lampshade. A cooling airflow is introduced from the air inlet pipe and discharged from the air outlet pipe to cool the gold-plated layer. The heating lamp can effectively cool the gold-plated layer. The lampshade can also prevent the gold-plated layer from being adsorbed by external foreign matter and damaged by human collision, which is beneficial to prevent the gold-plated layer from falling off, so as to improve the uniformity of temperature distribution during the preheating process of 3D printing powder. At the same time, it has an integrated structure, a simple manufacturing process, a small number of parts required and a low production cost.

[0009] In another exemplary embodiment of a heating lamp for preheating 3D printing powder, the lampshade is made of quartz glass. The lampshade includes a first end, a middle section and a second end. The first end, the middle section and the second end are sintered into an integrated structure. The body of the lamp tube is made of quartz glass. The first end and the second end are respectively fixed to the two ends of the body of the lamp tube by sintering. The wiring cable passes through the lampshade from the first end. The lampshade is made by segmented molding and then sintering, which is simple and easy to operate with low cost, and it is easy to obtain a lampshade with an integrated structure.

[0010] In another schematic embodiment of a heating lamp for preheating 3D printing powder, the first end is provided with a first support wall and a second support wall arranged at intervals along the length direction. The first support wall and the second support wall are respectively provided with through holes, and one end of the tube body of the lamp tube passes through the through holes provided on the second support wall and the first support wall in the opposite direction of the length direction. The second end is provided with a groove, and the other end of the tube body of the lamp tube is inserted into the groove along the length direction, and the first support wall and the second support wall are sintered into an integral structure with one end of the tube body of the lamp tube. The second end and the other end of the tube body of the lamp tube are sintered into an integral structure to form an inner cavity that only exhausts air from the exhaust pipe. The wiring cable passes through the lampshade from the through hole provided on the first support wall. In this way, the tube body of the lamp tube and the lampshade form an integral structure to close the gap between the two, so that the obtained inner cavity has high airtightness during operation.

[0011] In another exemplary embodiment of a heating lamp for preheating 3D printing powder, the lamp tube includes a first light-emitting tube and a second light-emitting tube arranged side by side, and the arrangement direction is perpendicular to the length direction. This facilitates flexible adjustment of the temperature field provided by the heating lamp and helps expand the application range of the heating lamp.

[0012] In another exemplary embodiment of a heating lamp for preheating 3D printing powder, the air inlet pipe and the air outlet pipe are respectively located on both sides of the inner cavity along a direction perpendicular to the length direction, thereby facilitating the cooling airflow to fill the entire inner cavity.

[0013] In another exemplary embodiment of a heating lamp for preheating 3D printing powder, the gold-plated layer wraps around the lamp tube in a cross section perpendicular to the length direction at an angle of 175° to 180° along a circumferential direction perpendicular to the length direction, so that the heat radiation light is emitted from the front side of the lamp tube along the first direction. This helps to emit all the heat radiation light emitted by the lamp tube along the front side of the first direction, thereby improving the use efficiency of the heating lamp.

[0014] The heating lamp group provided by the utility model comprises four heating lamps as described above. The lamp tubes of the four heating lamps are arranged in a rectangular shape to preheat the 3D printing powder laid in a rectangular area in front of the heating lamps along the first direction, thereby facilitating the uniformity of temperature distribution in the rectangular area.

[0015] In another exemplary embodiment of the heating lamp group, each lamp tube includes a first light-emitting tube and a second light-emitting tube arranged side by side in a direction perpendicular to the length direction. The first light-emitting tube includes a heating wire that uniformly covers a length range along the length direction. The second light-emitting tube includes two sections of heating wire that cover both ends of the length range along the length direction and a wire connecting the two sections of heating wire. The first light-emitting tube is arranged on the inner side of the rectangle, and the second light-emitting tube is arranged on the outer side of the rectangle. This helps to further improve the uniformity of temperature distribution in the rectangular area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are only used to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0017] Figure 1 A schematic diagram of the structure of an exemplary embodiment of a heating lamp for preheating 3D printing powder.

[0018] Figure 2 for Figure 1 Cross-sectional view along II-II.

[0019] Figure 3 for Figure 1 A cross-sectional view of a heat lamp is shown.

[0020] Figure 4 is a cross-sectional view of another exemplary embodiment of a heating lamp.

[0021] Figure 5 The figure is a schematic layout diagram for illustrating an exemplary implementation of a heating lamp group.

[0022] Description of symbols

[0023] 10. Lamp

[0024] 11 Wiring Cables

[0025] 12. First light-emitting tube

[0026] 13. Second light-emitting tube

[0027] 14 Heating wire

[0028] 15 Wire

[0029] 20 Gold plating

[0030] 30 Lampshade

[0031] 31 Lumen

[0032] 32 Exhaust pipe

[0033] 33 Intake pipe

[0034] 34 First terminal

[0035] 341 First Support Wall

[0036] 342 Second support wall

[0037] 35 Middle section

[0038] 36 Second terminal

[0039] R Rectangular area

[0040] L Length direction

[0041] D1 First direction. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0043] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0044] In this article, "first", "second", etc. do not indicate their importance or order, but are only used to indicate the difference between each other for the convenience of document description.

[0045] Figure 1 Schematic diagram of a schematic embodiment of a heating lamp for preheating 3D printing powder. In the schematic embodiment, see Figure 1 The heating lamp includes a lamp tube 10, a gold-plated layer 20 and a lampshade 30. The lamp tube 10 is as shown in FIG. Figure 1 As shown by the middle dotted line, the lamp tube 10 can emit heat radiation light when powered on. The gold-plated layer 20 is a layer of gold-plated film, which is formed on the back side of the lamp tube 10 along a first direction D1, and the first direction D1 is perpendicular to the length direction L of the lamp tube 10. The gold-plated layer 20 is formed by a coating process well known to those skilled in the art, such as chemical plating and evaporation. The thickness of the gold-plated layer 20 is, for example, 1 to 10 microns, which can reflect the heat radiation light emitted by the lamp tube 10, so that the heat radiation light is emitted from the front side along the first direction D1 to the 3D printing powder to be preheated.

[0046] The lampshade 30 is an integrated structure made of a transparent material and has an inner cavity 31. The transparent material may be quartz glass. The manufacturing method of the lampshade 30 may include manufacturing the components of the lampshade in sections, and then sintering the components into an integrated structure. The specific manufacturing method of the lampshade 30 will be described later and will not be repeated here.

[0047] The lamp tube 10 is arranged in the inner cavity 31. An air outlet pipe 32 and an air inlet pipe 33 connected to the inner cavity 31 are respectively provided at both ends of the lampshade 30 along the length direction L. The cooling airflow can enter the inner cavity 31 from the air inlet pipe 33 and flow out from the air outlet pipe 32 to cool the gold-plated layer 20. The cooling gas can be nitrogen, inert gas, air, carbon dioxide or other gases at room temperature, or refrigerated nitrogen, inert gas, air, carbon dioxide or other gases. The cooling gas can pass through a flow meter to control the gas flow rate. In the application scenario where the preheating temperature is not high, the operator can also block the air outlet pipe 32 and the air inlet pipe 33 to prevent pollutants such as dust from entering the inner cavity 31, thereby protecting the gold-plated layer 20.

[0048] The lamp tube 10 has a connection cable 11 , one end of which is connected to the internal circuit of the lamp tube 10 , and the other end of which extends out of the lamp housing 30 to be connected to an external power supply circuit.

[0049] The heating lamp is obtained by configuring the lampshade as an integrated structure and arranging the lamp tube in the inner cavity of the lampshade. A cooling airflow is introduced from the air inlet pipe and discharged from the air outlet pipe to cool the gold-plated layer. The heating lamp can effectively cool the gold-plated layer. The lampshade can also prevent the gold-plated layer from being adsorbed by external foreign matter and damaged by human collision, which is beneficial to prevent the gold-plated layer from falling off, so as to improve the uniformity of temperature distribution during the preheating process of 3D printing powder. At the same time, it has an integrated structure, a simple manufacturing process, a small number of parts required and a low production cost.

[0050] Figure 2Used to explain the production process of the lampshade, Figure 2 for Figure 1 A cross-sectional view along II-II. In an exemplary embodiment, the lampshade 30 is made of quartz glass. The lampshade 30 includes a first end 34, a middle section 35 and a second end 36. Figure 2 In the figure, the portion between the two dot-dash lines is the middle section 35, the left portion of the left dot-dash line is the first terminal 34, and the right portion of the right dot-dash line is the second terminal 36. The raw materials are sintered to obtain the first terminal 34, the middle section 35, and the second terminal 36.

[0051] The tube body of the lamp tube 10 is made of quartz glass. Figure 2 , Figure 2 The dotted line outlines the contour of the contact portion between the tube body of the lamp tube 10 and the lampshade 30 before sintering. The first end 34 is provided with a first support wall 341 and a second support wall 342 arranged at intervals along the length direction L. The first support wall 341 and the second support wall 342 are respectively provided with through holes, and one end of the tube body of the lamp tube 10 passes through the through holes provided on the second support wall 342 and the first support wall 341 in the opposite direction of the length direction L. The second end 36 is provided with a groove, and the other end of the tube body of the lamp tube 10 is inserted into the groove along the length direction L. The first support wall 341 and the second support wall 342 are sintered with one end of the tube body of the lamp tube 10 into an integral structure. The second end 36 and the other end of the tube body of the lamp tube 10 are sintered into an integral structure, and at the same time, the first end 34, the middle section 35 and the second end 36 are also sintered into an integral structure. At this time, an inner cavity 31 is formed between the tube body of the lamp tube 10 and the lampshade 30, and gas is only discharged from the gas outlet pipe 32. The connection cable 11 passes through the lampshade 30 from the through hole provided on the first supporting wall 341 along one end of the tube body of the lamp tube 10. Thus, the three parts of the lampshade 30 are sintered into an integrated structure, and the lampshade 30 and the tube body of the lamp tube 10 are sintered into an integrated structure, so that the formed inner cavity 31 has high airtightness during operation, and the high airtightness prevents cooling gas from escaping from the inner cavity during the preheating process of the 3D printing powder, which affects the stability of the temperature field and further affects the preheating effect of the 3D printing powder.

[0052] exist Figure 2 In the illustrated exemplary embodiment, the air inlet pipe 33 and the air outlet pipe 32 are respectively located on both sides of the inner cavity 31 along a direction perpendicular to the length direction L. This helps the cooling air flow to fill the entire inner cavity.

[0053] Figure 3 for Figure 1 The cross-sectional view of the heating lamp shown is perpendicular to the length direction L. Figure 4 is a cross-sectional view of another exemplary embodiment of a heating lamp. Figure 3The lamp tube 10 shown includes a first light-emitting tube 12 and a second light-emitting tube 13 arranged side by side, and the arrangement direction is perpendicular to the length direction L. The tube body of the first light-emitting tube 12 and the tube body of the second light-emitting tube 13 are sintered into an integral structure. In other exemplary embodiments, the tube body of the first light-emitting tube 12 and the tube body of the second light-emitting tube 13 can also be separated from each other. Figure 4 The lamp tube 10 shown includes only one light emitting tube. Figure 3 and Figure 4 The gold-plated layer wraps around the lamp tube 10 at a circumferential angle perpendicular to the length direction L in a cross section perpendicular to the length direction L, and the wrapping angle is 175° to 180°. At this wrapping angle, almost all the heat radiation light can be emitted from the front side of the lamp tube 10 along the first direction D1 to preheat the 3D printing powder, thereby facilitating that almost all the heat radiation light emitted by the lamp tube is emitted from the front side along the first direction D1, thereby improving the use efficiency of the heating lamp.

[0054] Figure 5 FIG. 1 is a schematic diagram of a layout of a heating lamp group for illustrating an exemplary embodiment. In the exemplary embodiment, the heating lamp group includes four heating lamps as described above. Figure 5 The lamp tubes 10 of the heating lamps are used to indicate their relative positions. Figure 5 The lamp tubes 10 of the four heating lamps are arranged in a rectangular shape and the first direction D1 of the four heating lamps is the same, so as to preheat the 3D printing powder laid in a rectangular area R in front of them along the first direction D1. Each heating lamp corresponds to one side of the rectangular area R, thereby facilitating the uniformity of temperature distribution in the rectangular area.

[0055] like Figure 5 As shown, each lamp tube 10 includes a first light-emitting tube 12 and a second light-emitting tube 13 arranged side by side in a direction perpendicular to the length direction L. The first light-emitting tube 12 includes a heating wire 14 that uniformly covers a length range along the length direction L. The second light-emitting tube 13 includes two sections of heating wire 14 covering both ends of the length range along the length direction L and a wire 15 connecting the two sections of heating wire 14. The first light-emitting tube 12 is arranged on the inner side of the rectangle, and the second light-emitting tube 13 is arranged on the outer side of the rectangle.

[0056] When preheating the 3D printing powder in a rectangular area R laid in front of it along the first direction D1, the temperature field provided only by the first light-emitting tube 12 is likely to cause the temperature at the four vertices of the rectangular area R to be significantly lower than the rest of the area. The temperature field provided by the first light-emitting tube 12 and the second light-emitting tube 13 can make the temperature of the four vertices of the rectangular area R close to that of the rest of the area, and the temperature distribution of the entire rectangular area is more uniform. Therefore, setting the first light-emitting tube 12 on the inside of the rectangle and the second light-emitting tube 13 on the outside of the rectangle is conducive to further improving the uniformity of the temperature distribution in the rectangular area.

[0057] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0058] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present utility model. They are not intended to limit the scope of protection of the present utility model. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the present utility model, such as combination, division or repetition of features, should be included in the scope of protection of the present utility model.

Claims

1. A heating lamp for preheating 3D printing powder, characterized in that: include: A lamp tube (10) capable of emitting heat radiation light when powered on; a gold-plated layer (20) formed on the back side of the lamp tube (10) along a first direction (D1), the first direction being perpendicular to a length direction (L) of the lamp tube (10), the gold-plated layer (20) being capable of reflecting heat radiation light emitted by the lamp tube (10); as well as A lampshade (30) is an integrated structure made of a transparent material and has an inner cavity (31). The lamp tube (10) is arranged in the inner cavity (31). An air outlet pipe (32) and an air inlet pipe (33) connected to the inner cavity (31) are respectively provided at two ends of the lampshade (30) along the length direction (L). A cooling airflow can enter the inner cavity (31) from the air inlet pipe (33) and flow out from the air outlet pipe (32) to cool the gold-plated layer (20). The lamp tube (10) has a wiring cable (11). The wiring cable (11) extends out of the lampshade (30) to connect to an external power supply circuit.

2. The heating lamp according to claim 1, characterized in that The lampshade (30) is made of quartz glass, and comprises a first end (34), a middle section (35) and a second end (36); the first end (34), the middle section (35) and the second end (36) are sintered into an integrated structure; the body of the lamp tube (10) is made of quartz glass, and the first end (34) and the second end (36) are respectively fixed to the two ends of the body of the lamp tube (10) by sintering; the wiring cable (11) passes through the lampshade (30) from the first end (34).

3. The heating lamp according to claim 2, characterized in that The first end (34) is provided with a first supporting wall (341) and a second supporting wall (342) arranged at intervals along the length direction (L); the first supporting wall (341) and the second supporting wall (342) are respectively provided with through holes; one end of the tube body of the lamp tube (10) passes through the through holes provided on the second supporting wall (342) and the first supporting wall (341) in sequence along the opposite direction of the length direction (L); the second end (36) is provided with a groove; the lamp tube (10) The other end of the tube body of the lamp tube (10) is inserted into the groove along the length direction (L), the first support wall (341) and the second support wall (342) are sintered with one end of the tube body of the lamp tube (10) to form an integral structure, and the second end head (36) is sintered with the other end of the tube body of the lamp tube (10) to form an integral structure to form an inner cavity (31) that only exhausts gas from the gas outlet pipe (32), and the wiring cable (11) passes through the lampshade (30) from the through hole opened on the first support wall (341).

4. The heating lamp according to claim 1, characterized in that The lamp tube (10) comprises a first light-emitting tube (12) and a second light-emitting tube (13) which are arranged side by side, and the arrangement direction is perpendicular to the length direction (L).

5. The heating lamp according to claim 1, characterized in that The air inlet pipe (33) and the air outlet pipe (32) are respectively located on two sides of the inner cavity (31) along a direction perpendicular to the length direction (L).

6. The heating lamp according to claim 1, characterized in that The gold-plated layer (20) wraps the lamp tube (10) at a wrapping angle of 175° to 180° along a circumferential direction perpendicular to the length direction (L) in a cross section perpendicular to the length direction (L), so that heat radiation light is emitted from the front side of the lamp tube (10) along the first direction (D1).

7. A heating lamp assembly, characterized in that: Comprising four heating lamps as claimed in any one of claims 1 to 6, the lamp tubes (10) of the four heating lamps are arranged in a rectangular shape to preheat 3D printing powder laid in a rectangular area in front of the heating lamps along the first direction (D1).

8. The heating lamp assembly according to claim 7, characterized in that: Each of the lamp tubes (10) comprises a first light-emitting tube (12) and a second light-emitting tube (13) arranged side by side in a direction perpendicular to the length direction (L); the first light-emitting tube (12) comprises a heating wire (14) uniformly covering a length range along the length direction (L); the second light-emitting tube (13) comprises two sections of heating wire (14) covering two ends of the length range along the length direction (L) and a wire (15) connecting the two sections of the heating wire (14); the first light-emitting tube (12) is arranged on the inner side of the rectangle, and the second light-emitting tube (13) is arranged on the outer side of the rectangle.

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