Auxiliary combustion device applied to photosensitive resin wax mold shell

Abstract

The utility model discloses an auxiliary combustion device applied to a photosensitive resin wax mould shell, which comprises a box-type roasting furnace and the photosensitive resin wax mould shell, a plurality of bases are arranged on the bottom wall of the box-type roasting furnace, a reserved ventilation opening and a pouring cup are arranged on the photosensitive resin wax mould shell, the photosensitive resin wax mould shell is sleeved on the bases through the pouring cup, and the photosensitive resin wax mould shell is arranged on the box-type roasting furnace. An air inlet head and a combustion head are arranged on the base, an air inlet head and a combustion head are also arranged on the peripheral wall of the box-type roasting furnace, the air inlet head is connected with an air blower through an air inlet pipe, and the combustion head is connected with a gas bottle through a gas pipe. According to the utility model, the base is arranged on the bottom wall of the box-type roasting furnace, and the photosensitive resin wax mold shell is conveniently sleeved on the base through the pouring cup; the air inlet head and the combustion head are arranged on the base, the inner cavity of the photosensitive resin fired mold shell can be heated and combusted, and the temperature of the photosensitive resin fired mold shell and the ceramic mold shell can be synchronously increased, so that crystal lattices in the inner cavity are softened preferentially, the skin can be reversely extruded towards the crystal lattices in the inner cavity after being heated, and the risk that the ceramic mold shell is expanded and cracked is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of baking of photosensitive resin wax mold shells, and specifically relates to an auxiliary combustion device applied to photosensitive resin wax mold shells. Background Art

[0002] The photosensitive resin wax mold shell is composed of a mold shell prepared from ceramic materials and a wax mold prepared from photosensitive resin. The wax mold includes a skin and a lattice. The skin adheres to the inner wall of the mold shell, and the lattice fills the inner cavity of the mold shell. The main component of the photosensitive resin is epoxy resin, and the wax mold is obtained by 3D printing. The existing photosensitive resin wax mold shells need to be baked by ordinary resistance furnaces and natural gas furnaces, so that the photosensitive resin undergoes two reactions of thermal cracking gasification and combustion upon encountering oxygen at high temperatures.

[0003] However, whether it is the existing resistance furnace or natural gas furnace, the heat sources are arranged on the surrounding furnace walls. The heat is generally conducted to the photosensitive resin investment mold through the mold shell made of ceramic materials, that is, the mold shell is heated first, then the skin of the photosensitive resin wax mold is heated, and finally the lattice of the photosensitive resin wax mold is heated. Since the thermal expansion coefficient of the photosensitive resin is one order of magnitude larger than that of the ceramic material mold shell; therefore, during the heat transfer process, the skin of the photosensitive resin expands after being heated, but since the lattice in the inner cavity of the mold shell has not been heated and the unheated lattice has not been softened by heat and has high strength; therefore, the expanded skin will cause the ceramic mold shell to crack. In addition, during the baking process of the existing photosensitive resin wax mold shells, due to the relatively insufficient oxygen inside the mold shell, an insufficient combustion environment is easily generated, resulting in a large amount of unburned black dust of the photosensitive resin, exceeding the processing capacity of the environmental protection equipment and causing serious air pollution problems. Summary of the Utility Model

[0004] The purpose of the utility model is to improve and innovate in view of the deficiencies and problems in the background art, and provide an auxiliary combustion device applied to photosensitive resin wax mold shells.

[0005] An auxiliary combustion device applied to photosensitive resin wax mold shells includes a box-type baking furnace and a photosensitive resin wax mold shell. A plurality of bases are installed on the bottom wall of the box-type baking furnace. The photosensitive resin wax mold shell is provided with a reserved ventilation port and a sprue cup. The photosensitive resin wax mold shell is sleeved on the base through the sprue cup. An air inlet head and a combustion head are arranged on the base, and an air inlet head and a combustion head are also arranged on the peripheral wall of the box-type baking furnace. The air inlet head is connected to a blower through an air inlet pipe, and the combustion head is connected to a gas cylinder through a gas pipe.

[0006] Further, the box-type baking furnace is sequentially connected with a suction machine, a secondary combustion device and a flue gas purification device through pipelines.

[0007] A further solution is that a heat exchanger is arranged between the secondary combustion device and the flue gas purification device, and the heat exchanger is used for heat exchange between the high-temperature flue gas discharged from the secondary combustion device and the low-temperature air blown in by the blower.

[0008] A further solution is that a plurality of heat exchange tubes are arranged inside the heat exchanger, the high-temperature flue gas flows inside the tubes of the heat exchange tubes, and the low-temperature air flows on the shell side of the heat exchanger.

[0009] A further solution is that the pedestals are arranged in an array on the bottom wall of the box-type roasting furnace.

[0010] A further solution is that it further includes a bypass pipe, and the bypass pipe is used to connect the air outlet end of the blower and the air outlet end of the heat exchanger.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: by arranging pedestals on the bottom wall of the box-type roasting furnace, the photosensitive resin wax mold shell can be conveniently sleeved on the pedestals through the pouring cup; and the pedestals are provided with air inlet heads and combustion heads, which can heat up and burn the inner cavity of the photosensitive resin investment mold shell, and synchronously heat up with the ceramic mold shell. Therefore, the inner cavity lattice softens preferentially, so that the skin will be squeezed reversely towards the lattice of the inner cavity after being heated, thus reducing the risk of the ceramic mold shell being cracked; the air inlet heads on the pedestals ensure that there is sufficient oxygen in the inner cavity of the mold shell for full combustion, further reducing the generation of black dust caused by incomplete combustion; the high-temperature gas carrying soot generated by roasting enters the secondary combustion device through the pipeline, and the unburned black dust is completely removed after secondary combustion; after the roasting of the photosensitive resin wax mold shell is completed, the air blown by the blower enters the inner cavity of the photosensitive resin wax mold shell through the bypass pipe, realizing the rapid cooling of the photosensitive resin wax mold shell. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic structural diagram of an auxiliary combustion device applied to a photosensitive resin wax mold shell provided by an embodiment of the present utility model;

[0014] Figure 2 It is a schematic structural diagram of a heat exchanger provided by an embodiment of the present utility model.

[0015] Reference numerals: box-type roasting furnace 1, gas cylinder 2, suction machine 3, secondary combustion equipment 4, blower 5, heat exchanger 6, heat exchange tube 61, flue gas purification equipment 7, photosensitive resin wax mold shell 8, reserved ventilation opening 81, sprue cup 82, base 9, air inlet pipe 10, gas pipe 11, air inlet head 12, combustion head 13, bypass pipe 14. Detailed implementation manners

[0016] To make the objectives, features, and advantages of the present utility model more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present utility model with reference to the accompanying drawings.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific implementation manners and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0019] Please refer to Figure 1 - Figure 2 , the present utility model provides an auxiliary combustion device applied to a photosensitive resin wax mold shell, including a box-type roasting furnace 1 and a photosensitive resin wax mold shell 8. A plurality of bases 9 are installed on the bottom wall of the box-type roasting furnace 1; preferably, the bases 9 are arranged in an array on the bottom wall of the box-type roasting furnace 1. The photosensitive resin wax mold shell 8 is provided with a reserved ventilation opening 81 and a sprue cup 82. The photosensitive resin wax mold shell 8 is sleeved on the base 9 through the sprue cup 82, and the inner cavity of the photosensitive resin wax mold shell 8 is communicated with the external environment through the reserved ventilation opening 81. An air inlet head 12 and a combustion head 13 are provided on the base 9, and an air inlet head 12 and a combustion head 13 are also provided on the peripheral wall of the box-type roasting furnace 1. The air inlet head 12 is connected to the blower 5 through an air inlet pipe 10, and the combustion head 13 is connected to the gas cylinder 2 through a gas pipe 11.

[0020] The ignition switch ignites the natural gas ejected from the burner head 13, causing the burner head 13 to eject a high-temperature flame. At the same time, the air intake head 13 on the base 9 ejects air. The burner head 13 on the base 9 directly heats the inner cavity of the mold shell, and the burner head 13 on the side wall of the box-type roasting furnace 1 heats the surface of the mold shell, enabling the lattice in the inner cavity of the mold shell to synchronously heat up with the ceramic material mold shell. Therefore, after the inner cavity lattice softens first, when the skin expands when heated and encounters the mold shell, it will be squeezed back towards the inner cavity, thus reducing the risk of the ceramic mold shell being cracked. In addition, the air intake head 12 on the base 9 ensures that there is sufficient oxygen in the inner cavity of the photosensitive resin wax mold shell 8 for full combustion, thereby reducing the generation of black dust caused by incomplete combustion.

[0021] The box-type roasting furnace 1 is sequentially connected with a suction machine 3, a secondary combustion device 4, and a flue gas purification device 7 through pipelines. Under the extraction action of the suction machine 3, the flue gas discharged from the box-type roasting furnace 1 sequentially passes through the secondary combustion device 4 and the flue gas purification device 7. After passing through the secondary combustion device 4, the soot is basically burned, and the flue gas purification device 7 mainly removes carbon dioxide in the flue gas.

[0022] Preferably, a heat exchanger 6 is arranged between the secondary combustion device 4 and the flue gas purification device 7. The heat exchanger 6 is used for heat exchange between the high-temperature flue gas discharged from the secondary combustion device 4 and the low-temperature air blown in by the blower 5, thereby improving the thermal energy utilization efficiency of the flue gas. Among them, a number of heat exchange tubes 61 are arranged in the heat exchanger 6. The high-temperature flue gas passes through the inside of the heat exchange tubes 61, and the low-temperature air passes through the shell side of the heat exchanger 6. Using the heat exchange tubes 61 as the medium for heat transfer to achieve heat exchange between the two.

[0023] Preferably, the air outlet end of the blower 5 is also connected with a bypass pipe 14. The bypass pipe 14 is used to connect the air outlet end of the blower 5 and the air outlet end of the heat exchanger 6. Cut-off valves are arranged at one end of the bypass pipe 14 and the air inlet pipe 10 close to the blower 5. The on-off of the cut-off valve controls the air outlet of the blower 5 to enter the bypass pipe 14 or the air inlet pipe 10. During the roasting process, the air outlet of the blower 5 enters the air inlet pipe 10 and is used for combustion support after being heated by heat exchange with the flue gas in the heat exchanger 6. After the roasting is completed, the air outlet of the blower 5 enters the bypass pipe 14, bypasses the heat exchanger 6 and directly enters the inner cavities of the box-type roasting furnace 1 and the photosensitive resin wax mold shell 8 to achieve rapid cooling of the photosensitive resin wax mold shell 8.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the utility model.

[0025] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0026] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Mentioning "embodiment" in this article means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application. Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An auxiliary combustion device for a photosensitive resin wax mold shell, comprising a box-type baking furnace (1) and a photosensitive resin wax mold shell (8), characterized in that: The bottom wall of the box-type roasting furnace (1) is provided with a plurality of bases (9); the photosensitive resin wax mold shell (8) is provided with a reserved ventilation hole (81) and a pouring cup (82); the photosensitive resin wax mold shell (8) is sleeved on the base (9) through the pouring cup (82); the base (9) is provided with an air intake head (12) and a combustion head (13); the peripheral wall of the box-type roasting furnace (1) is also provided with an air intake head (12) and a combustion head (13); the air intake head (12) is connected to the blower (5) through an air intake pipe (10); and the combustion head (13) is connected to the gas bottle (2) through a gas pipe (11).

2. The auxiliary combustion device for photosensitive resin wax mold shell according to claim 1, characterized in that: The box-type roasting furnace (1) is connected in sequence to a suction machine (3), a secondary combustion device (4) and a flue gas purification device (7) via pipelines.

3. The auxiliary combustion device for photosensitive resin wax mold shell according to claim 2, characterized in that: A heat exchanger (6) is provided between the secondary combustion device (4) and the flue gas purification device (7), and the heat exchanger (6) is used for heat exchange between the high-temperature flue gas discharged from the secondary combustion device (4) and the low-temperature air blown in by the blower (5).

4. The auxiliary combustion device for photosensitive resin wax mold shell according to claim 3, characterized in that: A plurality of heat exchange tubes (61) are arranged in the heat exchanger (6), the high-temperature flue gas flows through the heat exchange tubes (61), and the low-temperature air flows through the shell side of the heat exchanger (6).

5. The auxiliary combustion device for photosensitive resin wax mold shell according to claim 1, characterized in that: The bases (9) are distributed in an array on the bottom wall of the box-type roasting furnace (1).

6. The auxiliary combustion device for photosensitive resin wax mold shell according to claim 3, characterized in that: It also includes a bypass pipe (14), wherein the bypass pipe (14) is used to connect the air outlet end of the blower (5) and the air outlet end of the heat exchanger (6).

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