CN218196993U - Protective door of high temperature 3D printer - Google Patents

Abstract

The utility model provides a guard gate of high temperature 3D printer, high temperature 3D printer includes printer shell and heat preservation cabin, the heat preservation cabin is located in the printer shell, the guard gate with printer shell is articulated, the guard gate includes outer door, the transparent and elastic component of second, the transparent of second is located the relative more being close to of outer door one side in heat preservation cabin, the elastic component is located outer door with between the transparent of second, elastic component one end with outer door butt, the other end of elastic component with the transparent butt of second. The utility model provides a guard gate can provide the pretightning force for the transparent piece of second through setting up the elastic component for the relative outer door of transparent piece of second floats and sets up, can support the transparent piece of second tightly in the sealing washer of door frame when closing guard gate, satisfies the sealed requirement of high temperature 3D printer.

Description

Protective door of high temperature 3D printer

Technical Field

The utility model relates to a 3D printer, in particular to guard gate structure of FDM type 3D printer suitable for high temperature is printed.

Background

When a high-melting-point material (such as a polyetheretherketone PEEK material) is printed in an FDM type printer, the temperature of a heat-preservation cabin of the FDM type printer is generally required to be above 250 ℃, and under the high temperature, the sealing requirement cannot be realized by a common protective door. How to design a protective door suitable for high-temperature printing to meet the sealing requirement is a problem to be improved.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides a guard gate of high temperature 3D printer is favorable to satisfying sealed requirement.

The utility model adopts the following technical scheme:

the utility model provides a guard gate of high temperature 3D printer, high temperature 3D printer includes printer shell and heat preservation cabin, the heat preservation cabin is located in the printer shell, the guard gate with the printer shell is articulated, its characterized in that: the protective door comprises an outer door, a second transparent part and an elastic part, wherein the second transparent part is positioned on one side, relatively closer to the heat preservation cabin, of the outer door, the elastic part is positioned between the outer door and the second transparent part, one end of the elastic part is abutted to the outer door, and the other end of the elastic part is abutted to the second transparent part.

Compared with the prior art, the utility model has the advantages of it is following: the utility model provides a guard gate can provide the pretightning force for the transparent piece of second through setting up the elastic component for the relative outer door of transparent piece of second floats and sets up, can support the transparent piece of second tightly in the sealing washer of door frame when closing guard gate, satisfies the sealed requirement of high temperature 3D printer.

Drawings

FIG. 1 is a perspective view of a first embodiment of a high temperature 3D printer;

FIG. 2 is a front view of the high temperature 3D printer of FIG. 1 with the printer housing hidden (print head and print platform not shown);

FIG. 3 is a side view of the high temperature 3D printer of FIG. 1 with the printer housing, drying chamber door hidden (print head and print platform not shown);

FIG. 4 is a cross-sectional view taken along section C-C of FIG. 3, including a drying chamber door (print head, print platform, consumable items shown for illustrative purposes);

FIG. 5 is a view showing the installation structure of the first centrifugal fan and the third centrifugal fan with respect to the thermal insulation chamber;

FIG. 6 is an exploded view of the guard door and the door frame;

FIG. 7 is a perspective view of an angle of the doorframe of FIG. 6;

FIG. 8 is a schematic perspective view of another angle of the doorframe of FIG. 7;

FIG. 9 isbase:Sub>A cross-sectional view taken along section A-A of FIG. 2 (the printhead and the print deck not shown);

FIG. 10 is an enlarged partial view of FIG. 9;

FIG. 11 is a cross-sectional view taken along section B-B of FIG. 2 (print head and print platform not shown);

FIG. 12 is an enlarged partial view of FIG. 11;

fig. 13 is a perspective view of the guard door.

In the figure, 100-high temperature 3D printer, 1-thermal insulation cabin, 11-thermal insulator, 12-thermal insulation cabin inner container, 120-thermal insulation cavity, 121-first side wall, 122-first bottom plate, 123-air inlet, 13-thermal insulation cabin outer container, 131-second side wall, 1311-second air vent, 132-second bottom plate, 1321-first through hole, 1322-second through hole, 133-opening, 14-heating element, 15-supporting piece, 16-second centrifugal fan, 161-second driving motor, 1611-motor shaft, 170-air duct, 17-air duct plate, 2-printing head, 21-nozzle, 22-driving part, 3-printing platform, 4-printer shell, 41-second through hole, 51-first centrifugal fan, 511-a first driving motor, 52-a first air supply pipeline, 61-a drying chamber, 611-a drying chamber door, 612-a fixed shaft, 613-a limit baffle, 614-a third through hole, 615-an air guide member, 6151-a mounting groove, 616-a third filter screen, 62-a third centrifugal fan, 63-a second air supply pipeline, 64-a wire feeding mechanism, 7-a protective door, 71-a first transparent member, 72-a second transparent member, 73-an elastic member, 74-a door outer frame, 741-a limiting member, 7411-a connecting part, 7412-a limiting part, 742-a concave part, 75-a handle, 8-a door frame, 81-a main body part, 810-a door hole, 82-a first flange part, 83-a second flange part, 831-a first air vent, 84-handle, 85-sealing ring installation groove, 210-consumable reel, 220-consumable.

Detailed Description

In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments. In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "longitudinal", "lateral", "horizontal", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly to each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Referring to fig. 1 to 11, a high temperature 3D printer 100 of the present embodiment is suitable for printing high melting point materials, such as PEEK materials. The high-temperature 3D printer 100 comprises an insulation cabin 1, a printing head 2, a printing platform 3 and a printer shell 4, wherein the insulation cabin 1, the printing head 2 and the printing platform 3 are positioned in the printer shell 4, the printing platform 3 and a nozzle 21 of the printing head 2 are positioned in the insulation cabin 1, because the temperature in the insulation cabin 1 is too high, in order to prolong the service life and the precision of electronic elements, a driving part 22 of the printing head 2, such as a motor, can be arranged outside the insulation cabin 1, the top of the insulation cabin 1 is a deformable insulator 11, the driving part 22 and the nozzle 21 of the printing head 2 are isolated through the insulator 11, the insulator 11 can be deformed to facilitate the movement of the printing head 2 along the XY axis direction, the printing head 3 can move up and down along the Z axis direction, a lifting driving mechanism (not shown) of the printing platform 3 is positioned outside the insulation cabin 1, and the nozzle 21 of the printing head 2 is melted and extruded with printing material and formed on the printing platform 3. The high temperature 3D printer refers in particular to a printer with a high printing melting point, such as a thermal insulation cabin which needs to be arranged at 300-500 ℃, and a printer without the thermal insulation cabin is not included in the high temperature 3D printer.

The heat preservation cabin 1 comprises a heat preservation cabin inner container 12, a heat preservation cabin outer container 13 and a heating element 14, the heat preservation cabin inner container 12 is located inside the heat preservation cabin outer container 13, the heat preservation cabin inner container 12 is approximately in an open rectangle and comprises 4 first side walls 121 and a first bottom plate 122, the heat insulation body 11 is hermetically connected with the heat preservation cabin inner container 12, and the first bottom plate 122, the first side walls 121 and the heat insulation body 11 at the top are enclosed to form a heat preservation cavity 120. The thermal insulation cabin outer container 13 is also substantially in an open rectangular shape, and includes 4 second side walls 131 and a second bottom plate 132, and the second bottom plate 132 and the second side walls 131 enclose to form an open rectangular structure. It is understood that the inner container 12 and the outer container 13 of the thermal insulation cabin may also be in other shapes such as a cylinder shape, which is not limited herein, and the shapes of the corresponding first side wall, second side wall, first bottom plate and second bottom plate may be adjusted. The first side wall 121 and the second side wall 131 are oppositely arranged and have a certain distance, the first bottom plate 122 and the second bottom plate 132 also have a certain distance, a supporting member 15 with an I-shaped cross section is arranged between the first bottom plate 122 and the second bottom plate 132, one end face of the supporting member 15 is contacted with the first bottom plate 122, the other end face of the supporting member 15 is contacted with the second bottom plate 132, and the distance arrangement between the first bottom plate 122 and the second bottom plate 132 is realized through the supporting member 15.

The heating element 14 is disposed between the thermal insulation cabin inner container 12 and the thermal insulation cabin outer container 13, preferably, a plurality of heating elements 14 are tightly attached to the outer sides of at least two first side walls 121 (where the outer side refers to the side relatively close to the second side wall 131, and the inner side refers to the side located in the thermal insulation cavity 120), and when the heating elements 14 are disposed on only two first side walls 131, preferably, the two first side walls 131 are two side walls which are relatively parallel to each other, so as to heat the thermal insulation cabin 1 at multiple angles. The high-temperature 3D printer 100 further includes at least 2 second centrifugal fans 16, each second centrifugal fan includes a second driving motor 161 and a second impeller (not shown in the drawings), the second driving motor 161 is in transmission connection with the second impeller, the second impeller is located between the heat-preservation cabin inner container 12 and the heat-preservation cabin outer container 13 and is located below the corresponding heating element 14, a main body of the second driving motor 161 is located outside the heat-preservation cabin outer container 13, a motor shaft 1611 portion of the second driving motor 161 extends between the heat-preservation cabin inner container 12 and the heat-preservation cabin outer container 13 and is in transmission connection with the second impeller, and an air inlet of the second centrifugal fan 16 is communicated with the heat-preservation cavity 120. The high-temperature 3D printer 100 further includes an air duct plate 17, the air duct plate 17 is located between the first side wall 121 and the second side wall 131, the air duct plate 17 is connected and fixed with the first side wall 121 and encloses to form an air duct 170, one end of the air duct 170 is communicated with an air outlet of the second centrifugal fan 16, the air duct 170 axially extends upwards to the upper portion of the inner container 12 of the thermal insulation cabin, the upper portion of the inner container 12 of the thermal insulation cabin is provided with an air inlet 123, an outlet at the other end of the air duct 170 is communicated with the air inlet 123, the heating element 14 is located in the air duct 170, air in the thermal insulation cavity 120 is sucked out by the second centrifugal fan 16 and blown to the thermal insulation cavity 120 from the air inlet 123 after passing through the heating element 14, heat generated by the heating element 14 can be brought to the thermal insulation cavity 120, hot air flows downwards from the upper portion of the thermal insulation cavity 120, and the two air inlets 123 are arranged oppositely, so that hot air circulation in the thermal insulation cabin 1 is realized. It will be understood that the insulating outdoor cabinet 13 does not have to be regular rectangular, but in this embodiment, the two sides where the heating elements 14 are provided with raised side walls, which are also part of the second side wall 131 of the insulating outdoor cabinet 13, and are designed for material saving and for accommodating the air duct 170 and the heating elements 14. In addition, can also set up first filter screen at air intake 123, prevent that the part from falling into the heat preservation chamber 120 in to influence and print.

The high-temperature 3D printer 100 further comprises a thermal insulation cabin cooling system, the thermal insulation cabin cooling system comprises a first centrifugal fan 51 and a first air supply pipeline 52, the first centrifugal fan 51 comprises a first driving motor 511 and a first impeller (not shown in the drawings), the first driving motor 511 is in transmission connection with the first impeller, a first through hole 1321 is formed in the middle of the second bottom plate 132, the first through hole 1321 is communicated with the space inside and outside the thermal insulation cabin outer liner 13, the first centrifugal fan 51 is installed outside the second bottom plate 132, an air inlet of the first centrifugal fan 51 is communicated with the first through hole 1321, an air outlet of the first centrifugal fan 51 is communicated with one end of the first air supply pipeline 52, a second through hole 41 is formed in the side wall of the printer housing 4, and the first air supply pipeline 52 can penetrate through the second through hole 41 or an outlet of the first air supply pipeline 52 is communicated with the second through hole 41 in an aligned mode so as to be communicated with the outside atmosphere. The second through hole 41 may also be provided with a second filter. The first centrifugal fan 51 is preferably a sirocco fan, and the sirocco fan can quickly discharge air having a relatively high temperature between the inside container 12 and the outside container 13 of the thermal insulation compartment to the outside atmosphere through the first air supply duct 52.

The printer housing 4 is also provided with a plurality of vents which can communicate with the outside and the air inside the printer housing 4. The space between the insulated cabinet inner container 12 and the insulated cabinet outer container 13 communicates with the inside of the printer case 4 through a vent hole or another passage different from the first air supply duct 52. Specifically, the top of the insulating cabin outer liner 13 is open, and an air vent is formed through the open design, so that external air can enter the space between the insulating cabin outer liner 13 and the insulating cabin inner liner 12 through the opening 133. When the higher air of temperature between heat preservation cabin inner bag 12 and the heat preservation cabin outer bag 13 is carried to outside atmosphere by first centrifugal fan 51, whole printer 100 is in the negative pressure state, outside normal atmospheric air can enter into between heat preservation cabin inner bag 12 and the heat preservation cabin outer bag 13 through the vent of printer shell 4, the uncovered 133 department in heat preservation cabin outer bag 13 upper portion under the pressure differential effect, thereby cool down heat preservation cabin outer bag 13 and printer shell 4, make printer shell 4 temperature accord with the design requirement.

Since printing consumables (such as Peek material) are susceptible to moisture and affect printing effect, an independent consumable drying box is generally required to be used for drying the printing consumables, and extra energy, equipment and space are required to be consumed. The utility model discloses a high temperature 3D printer 100 still includes consumptive material drying system, consumptive material drying system includes drying chamber 61, third centrifugal fan 62, second supply-air duct 63. The second bottom plate 132 further has a second through hole 1322, the third centrifugal fan 62 is installed outside the second bottom plate 132, an air inlet of the third centrifugal fan 62 is communicated with the second through hole 1322, an air outlet of the third centrifugal fan 62 is communicated with one end of the second air supply duct 63, the bottom of the self-insulation cabin outer liner 13 of the second air supply duct 63 extends upwards towards the side wall thereof, and the other end of the second air supply duct 63 is communicated with the drying chamber 61. The drying chamber 61 is fixed on the surface of the side wall of the heat-preservation cabin outer liner 13, which is relatively far away from the heat-preservation cabin inner liner 12, the drying chamber 61 comprises a hinged drying chamber door 611, a fixing shaft 612 is arranged in the drying chamber 61, the fixing shaft 612 is fixed on the side wall which is arranged opposite to the drying chamber door 611, and the fixing shaft 612 is used for placing the consumable reel 210 for winding the consumable 220.

The drying chamber 61 further comprises a limit baffle 613 with an adjustable angle, the limit baffle 613 limits the consumable winding drum 210, and the limit baffle 613 is adjustable in angle and compatible with consumable winding drums with different specifications. The fixing shaft 612 is close to the drying chamber door 611 or slightly protruded from the drying chamber door 611 when the drying chamber door 611 is closed, so that the consumable roll 210 can be prevented from being separated from the fixing shaft 612. In addition, the bottom of the drying chamber 61 is provided with a third through hole 614, and the third through hole 614 is communicated with the second blowing duct 63. The drying chamber 61 further comprises a wind guide 615 with a flared shape, and the wind guide 615 is fixed to the bottom of the drying chamber 61 and aligned with the third through hole 614. The opening part of wind guide 615 is equipped with mounting groove 6151, the notch direction of mounting groove 6151 is parallel with the air supply direction of second supply air duct 63, the depth direction of mounting groove 6151 is perpendicular with the air supply direction of second supply air duct 63, drying chamber 61 still includes third filter screen 616, third filter screen 616 can insert and support in mounting groove 6151 from the mounting groove 6151 notch, the last side cell wall of mounting groove 6151 plays limiting displacement to third filter screen 616 position, partly below that is located this upside cell wall of third filter screen 616, can prevent that third filter screen 616 from being blown away by the wind that second supply air duct 63 carried, third filter screen 616 plays and filters and blocks outside spare part effect. The utility model discloses the heat of rational utilization high temperature 3D printer 100 self blows the hot-air that the temperature is higher relatively between heat preservation cabin inner bag 12 and the heat preservation extravehicular container 13 to drying chamber 61, utilizes the heat stoving printing consumables 220 of hot-air, has practiced thrift energy and certain space.

In addition, the consumable drying system further comprises a wire feeding mechanism 64, a part of the wire feeding mechanism 64 is located in the drying chamber 61, the wire feeding mechanism 64 is communicated with the drying chamber 61, the consumables 220 in the drying chamber 61 can be led to the outside of the drying chamber 61 through the wire feeding mechanism 64, and enter the printing head 2 at the top of the heat preservation cabin 1, the consumables are heated and melted through a heating module in the printing head 2 and are extruded out of the printing platform 3 for forming, 3D printing is carried out, the automation degree is high, the step of placing the consumables into the drying box for drying and then printing through a high-temperature 3D printer is omitted, and the printing flow is simplified.

High temperature 3D printer 100 still includes guard gate 7 and door frame 8, and guard gate 7 is connected with printer housing 4 is articulated, sets up guard gate 7 and has the printed product of being convenient for take, maintains, insulates against heat, observe functions such as printing the process. As shown in fig. 7 and 8, the door frame 8 is substantially square, the door frame 8 includes a main body 81, a first flange 82 and a second flange 83, the main body 81 has a door opening 810, the first flange 82 and the second flange 83 are fixedly connected to or integrally formed with the main body 81, the first flange 82 and the second flange 83 are arranged in parallel and spaced apart by a certain distance, the first flange 82 and the second flange 83 are respectively arranged on the left side, the right side and the bottom side of the main body 81, the first flange 82 and the second flange 83 extend from the main body 81 to a certain width in a direction away from the center of the main body 81, and a mounting portion is formed between the first flange 82 and the second flange 83. The side walls of the heat preservation cabin inner container 12 and the heat preservation cabin outer container 13 are provided with door openings corresponding to the door frames, the part of the first side wall 121 with the door openings and the part of the second side wall 131 with the door openings are located in the installation parts, the first side wall 121 is fixedly connected with the first flange parts 82 in a welding mode and the like, and the second side wall 131 is fixedly connected with the second flange parts 83 in a welding mode and the like. The second flange 83 has a plurality of first vents 831, and a second vent 1311 is disposed at a position of the second sidewall 131 opposite to the second flange 83, and the first vents 831 are connected to the second vent 1311. When the air with higher temperature between the insulated cabin inner container 12 and the insulated cabin outer container 13 is delivered to the outside atmosphere by the first centrifugal fan 51, the outside low-temperature air can enter the door frame 8 through the first and second ventilation holes 831 and 1311 to cool the door frame 8. This embodiment can make full use of current heat preservation cabin cooling system carry out the door frame cooling through to door frame structural design, is favorable to saving cooling arrangement and installation space.

The guard door 7 includes an outer door including a first transparent member 71, and a door outer frame 74, a second transparent member 72, and an elastic member 73. The first transparent member 71 is located inside the door frame 74, the first transparent member 71 is fixedly connected to the door frame 74, the first transparent member 71 may be made of organic glass or common inorganic glass, preferably organic glass in view of weight, and the second transparent member 72 is made of high temperature resistant inorganic glass because it is close to the insulating chamber 120. The second transparent member 72 is located on one side (i.e. the inner side) of the first transparent member 71/the outer layer door, which is relatively closer to the thermal insulation compartment 1, the inner side of the door outer frame 74 has a plurality of limiting members 741, the elastic member 73 is located between the door outer frame 74 and the second transparent member 72, the door outer frame 74 is provided with a recess 742 for mounting the limiting elastic member 73, one end of the elastic member 73 is located in the recess 742 and abuts against the door outer frame 74, the other end of the elastic member 73 abuts against the second transparent member 72, the outer edge of the second transparent member 72 is limited by the plurality of limiting members 741, in this embodiment, the number of limiting members is 4, the 4 limiting members 741 are respectively located at 4 corners of the second transparent member 72, and specifically, the elastic member 73 may be a compression spring. The limiting member 741 is L-shaped, the limiting member 741 includes a connecting portion 7411 and a limiting portion 7412, the connecting portion 7411 is perpendicular to the door outer frame 74, one end of the connecting portion 7411 is fixedly connected to the door outer frame 74, the other end of the connecting portion 7411 is connected to the limiting portion 7412, and the limiting portion 7412 extends a certain length toward the center of the second transparent member 72, so as to limit the second transparent member 72. The second transparent member 72 is disposed opposite to the first transparent member 71 and has a gap adjustable with the degree of compression of the elastic member 73 within a certain range. The protective door 7 further comprises a handle 75, the door frame 8 is fixed with a handle seat 84, the handle 75 is fixed on the door outer frame 74, and the handle seat 84 and the handle 75 are matched with each other and can be buckled.

The side of the door frame 8 away from the thermal insulation cabin inner container 12 is further provided with a sealing ring installation groove 85, and a sealing ring (not shown) is fixed in the sealing ring installation groove 85. When the protective door 7 is closed, the second transparent piece 72 is positioned on the side of the door frame 8 relatively far away from the insulated cabin inner container 12, and the door opening 810 is covered and closed by the second transparent piece 72. The elastic member 73 is in a compressed state, and the second transparent member 72 abuts against the sealing ring of the door frame 8 under the pre-tightening force of the elastic member 73. In this embodiment, the insulation cabin inner container 12 and the insulation cabin outer container 13 share the second transparent member 72, but of course, a transparent member may be provided for each of the insulation cabin inner container 12 and the insulation cabin outer container 13.

When the high-temperature 3D printer 100 works, the protective door 7 needs to be closed so as not to affect the printing process, because the temperature in the heat preservation cavity 120 is too high, the sealing requirement of a common protective door cannot be realized, and the protective door 7 of the embodiment can provide a pretightening force for the second transparent part 72 by arranging the elastic part 73, so that the second transparent part 72 is arranged in a floating manner relative to the door outer frame 74, the number of the elastic parts 73 is preferably 4 or more, the elastic parts are uniformly distributed on the outer edge of the second transparent part 72, and the second transparent part 72 can be tightly abutted to the sealing ring of the door frame 8 when the protective door 7 is closed, thereby satisfying the sealing requirement of the high-temperature 3D printer. Through setting up transparent piece two-layer and above, can play better thermal-insulated effect to conveniently observe the printing process.

The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is defined by the scope defined by the claims, and a plurality of modifications and decorations made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a guard gate of high temperature 3D printer, high temperature 3D printer includes printer housing and heat preservation cabin, the heat preservation cabin is located in the printer housing, guard gate with the printer housing is articulated, its characterized in that: the protective door comprises an outer layer door, a second transparent piece and an elastic piece, wherein the second transparent piece is positioned on one side, relatively closer to the heat-preservation cabin, of the outer layer door, the elastic piece is positioned between the outer layer door and the second transparent piece, one end of the elastic piece is abutted to the outer layer door, and the other end of the elastic piece is abutted to the second transparent piece.

2. The protective door of claim 1, wherein: the outer door comprises a first transparent piece and a door outer frame, wherein the first transparent piece is fixedly connected with the door outer frame.

3. The protective door of claim 2, wherein: one side of the door outer frame, which is relatively closer to the heat preservation cabin, is provided with a plurality of limiting parts, and the outer edge of the second transparent part is limited by the limiting parts.

4. The protective door of claim 3, wherein: the number of the limiting pieces is 4 or more, and at least 4 limiting pieces are respectively positioned at 4 corners of the second transparent piece; the number of the elastic pieces is 4 or more, and the elastic pieces are uniformly distributed on the outer edge of the second transparent piece.

5. The protective door of claim 4, wherein: the locating part is "L" type, the locating part includes connecting portion and spacing portion, connecting portion with the door frame is perpendicular, the one end of connecting portion with door frame fixed connection, the other end of connecting portion with spacing portion connects, spacing portion orientation the center of second transparent extends certain length.

6. The protective door of claim 2, wherein: the high-temperature 3D printer further comprises a door frame, the door frame is fixed to the heat preservation cabin, a sealing ring is arranged on one side, away from the center of the inner cavity of the heat preservation cabin, of the door frame, when the protection door is closed, the elastic piece is compressed, and the second transparent piece covers and seals the door opening of the door frame and is abutted to the sealing ring.

7. The protective door of claim 2, wherein: the elastic piece is a compression spring, a concave part is arranged on one side, close to the heat preservation cabin, of the door outer frame, and one end of the elastic piece is located in the concave part.

8. The protective door of claim 6, wherein: the protective door further comprises a handle, the handle is fixed to the door outer frame, a handle seat is fixed to the door frame, and the handle seat and the handle are mutually matched and buckled.

9. The protective door of claim 2, wherein: the first transparent piece is organic glass or inorganic glass, and the second transparent piece is high temperature resistant inorganic glass.

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