Open type high-temperature 3D printing guarantee device

Abstract

The utility model relates to and discloses an open type high temperature 3D printing guarantee device, including 3D printer, hot air module, air supply duct and L-shaped exhaust plate, hot air module is installed in the front side end face of support plate in 3D printer, air supply duct is connected with the air outlet of hot air module, L-shaped exhaust plate is installed in the periphery of printing nozzle in 3D printer, and the L-shaped exhaust plate is connected with the air outlet of hot air module. The printing nozzle is fixedly connected with the supporting plate and is connected with an air outlet of the air supply pipeline; according to the open type high-temperature 3D printing guarantee device, through a series of hot air generation and transmission of the hot air module, the air supply pipeline and the L-shaped exhaust plate, temperature difference compensation is synchronously carried out along with the printing spray head, and local heating and heat preservation can be carried out on a deposition area on the printing platform in an open type environment; on the one hand, local heating and heat preservation can avoid the problem of excessive loss and waste of energy, on the other hand, the design structure is simple, the manufacturing cost is low, the device is not limited by the size of a printing structural part during working, and large objects or parts with larger sizes can be printed.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to an open high-temperature 3D printing protection device. Background Art

[0002] In recent years, 3D printing forming devices with different printing principles have emerged with the 3D printing technology as the core. Among them, the Fused Deposition Modeling (FDM) device has become a common choice for current 3D printing due to its simple structure and convenient operation. Its hardware core is a hot melt printing nozzle, and the printing material is mostly hot melt plastic. Under the control of the main control board, the feeding mechanism pushes the hot melt plastic to the printing nozzle, and then it is melted and extruded to form. With the increasing demand for high melting point polymers (such as PEEK, ULTEM, etc.) in the industrial, medical and other fields, the market demand for FDM devices that can process these materials is also growing. The existing fused deposition modeling provides a closed printing chamber with high temperature applied, which can effectively improve the temperature difference gradient, thereby reducing the shrinkage of the extruded filament, and this can reduce the internal stress generated during the curing process of the workpiece.

[0003] For example, the invention patent with the application number 2019100665436 discloses a constant temperature 3D printer. If the temperature of the entire space is raised to too high a level, the excessive space heating will not only cause energy loss, but also make each part expand due to heat, and will affect the equipment accuracy, putting higher requirements on the equipment. Another example is a 3D printing constant temperature forming cavity disclosed in the invention patent with the application number 201610250731, which includes a forming cavity module and a forming platform module, and can effectively avoid the phenomenon that the upper and lower layers of the material model shrink inconsistently during the printing process. However, the printing area of this printer is too small to print large objects or parts, which will limit the production capacity and flexibility, and the parts are too delicate and the manufacturing cost is high.

[0004] As can be seen from the above, in the prior art, the open 3D printer heats the entire space, which not only causes too high energy consumption, but also makes each part expand due to heat, and there is also the problem that the closed 3D printer in the prior art cannot print large objects or parts. For this reason, this article proposes an open high-temperature 3D printing protection device, which mainly uses the hot air end to move synchronously with the printing nozzle to ensure that the hot air output is always accurately aligned with the deposition area, so as to reduce the temperature gradient in the forming range near the printing nozzle, thereby reducing the thermal stress problem caused by too large a temperature difference to meet the use requirements. Through this open device, the cooperative shrinkage of the extruded filament can be guaranteed, thereby improving the warping deformation problem, and the requirements for printing large objects and saving energy can also be realized. Content of the Utility Model

[0005] The object of the present utility model is to solve the problems in the prior art that the open 3D printer heats the entire space, which not only causes excessive energy loss, but also makes each part expand due to heat, and that the closed 3D printer in the prior art cannot print large objects or parts, and a proposed open high-temperature 3D printing protection device is provided.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] An open high-temperature 3D printing protection device, including a 3D printer, further including:

[0008] A hot air module, installed on the front end face of the support plate in the 3D printer;

[0009] An air supply duct, connected to the air outlet of the hot air module;

[0010] An L-shaped exhaust plate, installed around the printing nozzle in the 3D printer and connected to the air outlet of the air supply duct, and the printing nozzle is fixedly connected to the support plate.

[0011] Preferably, the hot air module includes a square box, a fan blade, a motor, a plurality of heating elements, a nozzle, and a gas collecting hood. The gas collecting hood is fitted and installed in the square box, and the lower end of the gas collecting hood is hermetically and fittingly connected to the inner bottom surface of the square box. The top end of the nozzle is fixedly connected to the lower bottom surface of the square box and communicates with the inner cavity of the gas collecting hood. The heating elements are fixedly and fittingly installed on the inner wall of the lower end of the gas collecting hood. The motor is fixedly connected to the inner cavity of the top end of the gas collecting hood, and the output shaft of the motor is fixedly connected to the fan blade.

[0012] Preferably, the L-shaped exhaust plate includes an upper wind plate and a rear wind plate connected perpendicularly to each other. The rear wind plate is fixedly connected to the support plate. A plurality of vertical micropores I are arranged on the lower surface of the upper wind plate, and a plurality of micropores II are arranged on the front end face of the rear wind plate. A through hole communicates the plurality of vertical micropores I and the plurality of micropores II, and the end of the air supply duct is fixedly communicated with the through hole.

[0013] Preferably, the air supply duct is successively sleeved and composed of a hot air duct, a heat insulation sleeve, and an outer sleeve from the inside to the outside.

[0014] Preferably, a connecting sleeve is fixedly connected between the motor and the inner wall of the gas collecting hood, and the nozzle is fixedly connected to the support plate through a support frame.

[0015] Preferably, a filter screen is fixedly connected to the top end of the gas collecting hood.

[0016] Compared with the prior art, the present utility model provides an open high-temperature 3D printing protection device, having the following beneficial effects:

[0017] The open high-temperature 3D printing protection device generates and transfers a series of hot air through the hot air module, air supply duct, and L-shaped exhaust plate, and synchronously follows the printing nozzle for temperature difference compensation. It can locally heat and insulate the deposition area on the printing platform in an open environment. Local heating and insulation can avoid excessive energy loss and waste, reduce the temperature gradient in the forming range near the printing nozzle, and reduce the thermal stress problem caused by excessive temperature difference. Furthermore, it reduces the shrinkage phenomenon between the newly deposited layer and the adjacent deposited layer. On the one hand, it is convenient to keep the temperature difference between the material being processed and the processed material within an acceptable range, thus avoiding warping and delamination caused by inconsistent shrinkage of the upper and lower layers of the material model during the 3D printing process, and better solving the problem of uneven cooling rates of each layer. On the other hand, this design has a simple structure, low manufacturing cost, and is not limited by the size of the printing structural parts during operation. Compared with a closed 3D printer, it can print larger-sized large objects or parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic structural diagram of an open high-temperature 3D printing protection device proposed by the present utility model;

[0019] Figure 2 FIG. 2 is a schematic structural diagram of the air supply duct in an open high-temperature 3D printing protection device proposed by the present utility model;

[0020] Figure 3 FIG. 3 is a cross-sectional view of the hot air module in an open high-temperature 3D printing protection device proposed by the present utility model;

[0021] Figure 4 FIG. 4 is a perspective view of the L-shaped exhaust plate in an open high-temperature 3D printing protection device proposed by the present utility model;

[0022] Figure 5 FIG. 5 is a cross-sectional view of the L-shaped exhaust plate in an open high-temperature 3D printing protection device proposed by the present utility model; Figure 1 ;

[0023] Figure 6 FIG. 6 is a cross-sectional view of the L-shaped exhaust plate in an open high-temperature 3D printing protection device proposed by the present utility model; Figure 2 .

[0024] In the figure: 1. Hot air module; 100. Square box; 101. Fan blade; 102. Motor; 103. Heating element; 104. Support frame; 105. Air nozzle; 106. Filter screen; 107. Air collecting hood; 108. Connecting sleeve; 2. Air supply duct; 200. Outer sleeve; 201. Heat insulation sleeve; 202. Hot air duct; 3. L-shaped exhaust plate; 301. Upper air plate; 302. Rear air plate; 303. Through hole; 304. First vertical micro hole; 305. Second micro hole; 4. 3D printer; 400. Support plate; 401. Support pillar; 402. Printing platform; 403. Printing nozzle. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] Referring to the attached Figures 1-6 , an open-type high-temperature 3D printing protection device includes a 3D printer 4. The 3D printer 4 includes support pillars 401, a printing platform 402, and a support plate 400. The printing platform 402 is placed horizontally and is automatically moved and installed below the support pillars 401 through two electric lead screw numerical control modules arranged in a cross shape in the prior art, mainly used to automatically move the printing platform 402 in the X-axis and Y-axis directions at the lower end of the support pillars 401. The support plate 400 is placed vertically and is automatically vertically moved and installed above the support pillars 401 through an electric lead screw numerical control module in the prior art. A printing nozzle 403 is fixedly installed on the front end face of the support plate 400.

[0028] In this embodiment, a hot air module 1, an air supply duct 2, and an L-shaped exhaust plate 3 are installed on the front end face of the support plate 400 in the 3D printer 4. The air supply duct 2 is connected to the air outlet of the hot air module 1, and the L-shaped exhaust plate 3 is connected to the air outlet of the air supply duct 2;

[0029] The hot air module 1 includes a square box 100, a fan blade 101, a motor 102, two heating elements 103, a support frame 104, a nozzle 105, a filter screen 106, and an air collecting hood 107. The outer ring of the filter screen 106 is fixedly and hermetically installed in the inner ring of the air collecting hood 107. The filter screen 106 is mainly used to filter dust in the air. The fan blade 101 and the motor 102 are arranged at the upper end of the air collecting hood 107. The housing of the motor 102 is fixedly connected to the inner wall of the square box 100 through a connecting sleeve 108, and the output shaft of the motor 102 is coaxially and fixedly connected to the fan blade 101. The two heating elements 103 are arranged below the motor 102 and are respectively fixedly and symmetrically installed on the inner side of the lower end of the air collecting hood 107. The top end of the nozzle 105 is fixedly communicated with the lower bottom surface of the square box 100. The hot air module 1 generates a stable air flow by means of the heating elements 103 provided, and then the fan blade 101 is driven by the output shaft of the motor 102;

[0030] The air collecting hood 107 is fitted and installed in the square box 100, and the outer wall of the top end of the air collecting hood 107 is hermetically and fittingly connected to the inner wall of the square box 100. The inner bottom surface of the square box 100 is hermetically and fittingly connected to the lower bottom surface of the air collecting hood 107, so that the nozzle 105 and the air collecting hood 107 are communicated with each other. The nozzle 105 at the bottom conveys the hot air to the air supply duct 2. Threaded holes are provided on both sides of the support frame 104 in the hot air module 1, and the support frame 104 is fixedly connected to the support plate 400 by threads. Through the support frame 104, the effect of fixed cooperation between the hot air module 1 and the support plate 400 can be achieved. The power of the hot air module 1 can be adjusted according to conditions such as distance and material.

[0031] In this embodiment, the first end of the air supply duct 2 is fixedly communicated with the hot air module 1. The air supply duct 2 is sequentially sleeved and formed by a hot air pipe 202, a heat insulation sleeve 201, and an outer sleeve 200 from the inside to the outside. The end of the air supply duct 2 is fixedly connected to the L-shaped exhaust plate 3. The heat insulation sleeve 201 is made of heat insulation cotton material, such as mineral wool or ceramic fiber cotton. By setting the heat insulation sleeve 201 to be made of heat insulation cotton material in this application, the heat insulation performance of the air supply duct 2 can be improved, the temperature drop on the surface of the air supply duct 2 can be reduced, so as to accurately control the temperature and reduce heat loss.

[0032] In this embodiment, the above-mentioned air supply duct 2 is mainly used to convey the hot air flow to the L-shaped exhaust plate 3 above and behind the printing platform 402. A through hole 303 adapted to the air supply duct 2 is provided on the side surface of the L-shaped exhaust plate 3. The L-shaped exhaust plate 3 and the printing platform 402 do not interfere with each other. The support plate 400 is fixedly connected to the L-shaped exhaust plate 3, and the support plate 400 is fixedly connected to the printing nozzle 403 and keeps the relative position unchanged, so that the hot air output by the L-shaped exhaust plate 3 also moves synchronously with the printing nozzle 403.

[0033] In this embodiment, the L-shaped exhaust plate 3 includes an upper wind plate 301 and a rear wind plate 302. The through hole 303 is provided on one side of the upper wind plate 301. The upper wind plate 301 is horizontally arranged, the rear wind plate 302 is vertically arranged, the upper wind plate 301 and the rear wind plate 302 are perpendicularly connected. The upper wind plate 301 is fixedly engaged with the support plate 400 where the printing nozzle 403 is located. The upper end of the rear wind plate 302 is fixedly connected to the upper wind plate 301 and the interiors of the two are interconnected. The L-shaped exhaust plate 3 can be alternatively configured, and the L-shaped exhaust plate 3 with different air outlet ranges can be replaced according to the melting points of various printing materials;

[0034] Below the upper wind plate 301, a number of vertically arranged micro holes 304 are densely and evenly distributed. The air outlet of the vertical micro holes 304 faces vertically downward. On the front side surface of the rear wind plate 302, a number of micro holes 305 are densely and evenly distributed and are inclined downward or in a horizontal state. The through hole 303 is respectively interconnected with a number of vertical micro holes 304 and a number of micro holes 305. The bottom end of the rear wind plate 302 is slightly higher than the printing nozzle 403 so as not to interfere with the printing platform 402 during synchronous following. Both the upper wind plate 301 and the rear wind plate 302 are made of ceramic fiber heat insulation materials;

[0035] The shape design of the L-shaped exhaust plate 3 enables the hot air flow to act precisely on the gap extruded by the nozzle, which can reduce the temperature difference between layers of materials. Moreover, this design reduces the volume of the L-shaped exhaust plate 3, avoiding interference between the exhaust plate and the platform, and the actual use effect is relatively excellent. In this application, by setting the L-shaped exhaust plate 3 to be made of ceramic fiber heat insulation materials, due to its excellent heat insulation performance, the ceramic fiber helps to reduce energy consumption, and the relatively low density of the ceramic fiber helps to reduce the overall weight of the equipment, and at the same time is convenient for installation and operation.

[0036] Reference Figure 2 , when the hot air module 1 is started, the motor 102 inside converts electrical energy into mechanical energy, driving the fan blade 101 to generate an air flow. Two heating elements 103 are arranged inside the hot air module 1, usually heating wires made of nickel-chromium alloy. When an electric current acts on the heating wires, the heating elements 103 are heated up. The air flow generated by the fan blade passes through the heating elements 103 before passing through the air outlet nozzle 104, thus forming a hot air flow. This hot air flow flows out of the air outlet nozzle 104, passes through the air outlet pipe 2, enters the L-shaped exhaust plate 3, and is applied with hot air from above and behind the printing nozzle 403 through a number of vertical micro holes 304 and a number of micro holes 305 in the L-shaped exhaust plate 3. The temperature of the deposition area of the molten material on the printing platform 402 is maintained within a good range within the hot air coverage area of the L-shaped exhaust plate 3. The material layers outside the hot air coverage area have already achieved preliminary shrinkage and bonding and no longer require hot air following. The above-mentioned hot air coverage area is set above the deposition area and the hot air coverage area moves following the printing nozzle 403.

[0037] It should be noted that the motor 102, the heating element 103, and the 3D printer are all connected to an external power source through wires.

[0038] In this utility model, by providing the hot air blower module 100, more precise cooling control can be achieved in an open environment, reducing the non-uniformity of temperature difference of the material during the printing process, thereby reducing the risk of warping and deformation. By providing the air supply duct 2, the hot air can be more effectively guided to the L-shaped exhaust plate 3 to avoid heat loss. By providing the L-shaped exhaust plate 3, the coverage of the hot air output to a specific area can be achieved, keeping the material deposition within an appropriate temperature range during cooling, which helps to avoid premature curing or overheating. By providing the support plate 400, the hot air module 1 and the L-shaped exhaust plate 3 can always move synchronously with the print head 403, ensuring that the hot air output always acts precisely within the local forming range near the print head 403.

[0039] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An open high-temperature 3D printing protection device, including a 3D printer (4), characterized in that, It further includes: A hot air module (1), installed on the front end face of the support plate (400) in the 3D printer (4); An air supply duct (2), connected to the air outlet of the hot air module (1); An L-shaped exhaust plate (3), installed around the print head (403) in the 3D printer (4) and connected to the air outlet of the air supply duct (2), and the print head (403) is fixedly connected to the support plate (400).

2. The open-type high-temperature 3D printing guarantee device according to claim 1, wherein: The hot air module (1) includes a square box (100), a fan blade (101), a motor (102), several heating elements (103), a nozzle (105), and a gas collecting hood (107). The gas collecting hood (107) is fitted and installed in the square box (100), and the lower end of the gas collecting hood (107) is hermetically and adhesively connected to the inner bottom surface of the square box (100). The top end of the nozzle (105) is fixedly connected to the lower bottom surface of the square box (100) and is in communication with the inner cavity of the gas collecting hood (107). The heating elements (103) are fixedly and adhesively installed on the inner wall of the lower end of the gas collecting hood (107). The motor (102) is fixedly connected to the inner cavity at the top of the gas collecting hood (107), and the output shaft of the motor (102) is fixedly connected to the fan blade (101).

3. The open high-temperature 3D printing guarantee device according to claim 1, characterized in that: The L-shaped exhaust plate (3) includes an upper wind plate (301) and a rear wind plate (302) connected perpendicularly to each other. The rear wind plate (302) is fixedly connected to the support plate (400). A number of vertical micro-holes one (304) are provided on the lower surface of the upper wind plate (301). A number of micro-holes two (305) are provided on the front end face of the rear wind plate (302), and a through hole (303) communicates with the number of vertical micro-holes one (304) and the number of micro-holes two (305). The end of the air supply duct (2) is fixedly communicated with the through hole (303).

4. The open high-temperature 3D printing protection device according to claim 1, wherein: The air supply duct (2) is successively sleeved and formed by a hot air duct (202), a heat insulation sleeve (201), and an outer sleeve (200) from the inside to the outside.

5. The open high-temperature 3D printing guarantee device according to claim 2, characterized in that: A connecting sleeve (108) is fixedly connected between the motor (102) and the inner wall of the gas collecting hood (107), and the nozzle (105) is fixedly connected to the support plate (400) through a support frame (104).

6. The open high-temperature 3D printing guarantee device according to claim 2, characterized in that: A filter screen (106) is fixedly connected to the top end of the gas collecting hood (107).

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