Degumming and sintering integrated furnace

Abstract

The degumming and sintering integrated furnace comprises a heating body, a furnace body, a furnace pipe and a double-layer degumming sleeve, the heating body is supported in the furnace pipe through an insulating support, the double-layer degumming sleeve is installed under the heating body, and the double-layer degumming sleeve penetrates through the furnace pipe, a heat preservation layer and the furnace body and is communicated with a dewaxing pipeline; the double-layer rubber discharging sleeve is divided into an inner dewaxing pipe and an outer dewaxing pipe, the outer dewaxing pipe is a tubular body, the diameter of the outer dewaxing pipe is larger than that of the inner dewaxing pipe, a protruding part is arranged on the edge of one end, close to the heating body, of the outer dewaxing pipe and clamped on an inner shell of the furnace pipe, the inner dewaxing pipe is the same as the outer dewaxing pipe in tubular body, and the length of the inner dewaxing pipe is smaller than that of the outer dewaxing pipe. And the convex part is clamped above the outer dewaxing pipe.

Description

Technical Field

[0001] This utility model relates to the field of degumming sintering furnaces, and in particular to an integrated degumming sintering furnace. Background Technology

[0002] The degumming and sintering integrated furnace is a high-temperature processing equipment specifically designed for powder forming products such as ceramics and cemented carbide. It can complete both degumming and sintering processes in the same furnace. This type of equipment typically features high temperature control precision and uniformity, ensuring the quality of materials during debinding and sintering. Powder molding products require the addition of binders to enhance powder cohesion for easier molding and subsequent processing. Therefore, a debinding step is necessary before firing the powder molded products. This involves holding the product at a specific temperature (e.g., 500℃) for a period to decompose and remove the binder, preventing residual organic matter from affecting product quality during sintering. Previously, vacuum sintering furnaces only required small-batch debinding and sintering of powder molded products. However, with advancements in technology and increased demands for processing efficiency in ceramic processing plants, large-scale sintering and debinding are now required in vacuum sintering furnaces. Currently, the debinding channels in vacuum sintering furnaces are relatively narrow. Condensation of the debinding gas as it passes through these channels gradually narrows them, preventing timely removal of the colloid and even causing blockages. This necessitates replacing the debinding pipes, which are directly connected to the furnace shell, making replacement inconvenient. Therefore, improvements are essential.

[0003] A search revealed no technical solutions identical to this utility model; only some relevant comparative technical documents were found, mainly the following:

[0004] 1. Patent application number 201120123779.8 discloses an integrated vacuum furnace for degumming and sintering. The furnace body of this patent has a hydrogen inlet, and inside the furnace body is a heating element separated from the furnace body by an insulation layer. One end of the glue discharge pipe has an ignition pipe, and the other end is connected to the furnace body through a glue collection tank. This patent does not solve the technical problem of blockage in the glue discharge channel due to condensation caused by the passing glue discharge gas.

[0005] 2. Patent application number 201820432333.5 relates to the field of vacuum heating furnace technology, and in particular to a glue removal device for a vacuum furnace used in reaction sintering of silicon carbide materials. It includes a graphite air duct, a water-cooled flange, a water-cooled tee, a pneumatic ball valve, a glue removal pipeline, and an exhaust fan. The water-cooled flange is fixed to the furnace body connecting pipe. One end of the water-cooled tee is connected to the water-cooled flange. The pneumatic ball valve is placed between the water-cooled tee and the glue removal pipeline. The exhaust fan is fixed at the end of the glue removal pipeline. The graphite air duct is fixed to the side wall of the heating chamber inside the vacuum furnace and connected to the water-cooled flange. A cleaning cover is provided on the third end of the water-cooled tee. This patent uses circulating cooling water to keep the wall of the water-cooled tee at a low temperature. However, glue vapor condenses on the inner wall of the water-cooled tee upon cooling, and over time, this accumulation reduces the pipe diameter, affecting the glue removal speed.

[0006] 3. Patent application number 202222750926.5 discloses a vacuum furnace body and vacuum equipment. The vacuum furnace body includes an outer furnace shell, an inner furnace shell, a furnace shell connecting ring, a furnace tail flange, a furnace door flange, and a vacuum extraction pipe. The outer furnace shell is open at both ends. The outer wall of the inner furnace shell is spaced apart from the inner wall of the outer furnace shell to define a cooling channel with both ends open. The cooling channel has a cooling outlet and a cooling inlet. The furnace shell connecting ring is welded to one end of the outer furnace shell and the inner furnace shell, and is used to close one end of the cooling channel. The furnace tail flange is welded to the furnace shell connecting ring and is located on the side of the furnace shell connecting ring away from the outer furnace shell. The furnace door flange is welded to the other end of the outer furnace shell and the inner furnace shell, and is used to close the other end of the cooling channel. One end of the vacuum extraction pipe passes through and is welded to the outer furnace shell and the inner furnace shell. This patent does not solve the technical problem of blockage in the glue discharge channel due to condensation caused by the passing of glue discharge gas.

[0007] Analysis of the aforementioned patents reveals that current vacuum sintering furnaces do not consider large-scale sintering and binder removal within the furnace. Furthermore, the binder removal port of the heating element is narrow and frequently blocked by condensation caused by the passing binder removal gas. Therefore, the aforementioned problems persist, necessitating improvements. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide an integrated degumming and sintering furnace, which effectively solves the technical problem that the current vacuum sintering furnace has a narrow discharge port channel for the heating element, which is often blocked by the condensation phenomenon generated by the discharge gas, and is inconvenient to replace.

[0009] The technical solution proposed by this utility model is as follows: a degumming and sintering integrated furnace, comprising a heating element, a furnace body, a furnace liner, and a double-layer degumming sleeve. The heating element is supported inside the furnace liner by an insulating support. The double-layer degumming sleeve is installed directly below the heating element and passes through the furnace liner, the insulation layer, and the furnace body, connecting with the dewaxing pipe. The double-layer degumming sleeve is divided into an inner dewaxing pipe and an outer dewaxing pipe. The outer dewaxing pipe is a tubular body with a diameter larger than that of the inner dewaxing pipe, and has a protruding part at one end near the heating element. The protruding part is stuck on the inner shell of the furnace liner. The inner dewaxing pipe is a tubular body similar to that of the outer dewaxing pipe. The inner dewaxing pipe is installed in the inlet section of the outer dewaxing pipe and has a length shorter than that of the outer dewaxing pipe. The protruding part is stuck above the outer dewaxing pipe.

[0010] Furthermore, the inner dewaxing tube and the outer dewaxing tube are in a movable fit with a gap, and are disposable items. The inner diameter of the inner tube is smaller than that of the outer dewaxing tube. After the glue-containing gas condenses, it is easy to block the inner dewaxing tube. After the double-layer glue discharge sleeve is blocked, the blockage can be relieved by removing the inner dewaxing tube.

[0011] Furthermore, there is a gap of 0.1-1.5mm between the sidewall of the outer dewaxing tube and the sidewall of the inner dewaxing tube, which facilitates the removal of the inner dewaxing tube.

[0012] Furthermore, the distance by which the inner dewaxing tube extends into the outer dewaxing tube is 150-200mm.

[0013] Furthermore, the inner and outer dewaxing tubes of the double-layer dewaxing sleeve are made of the same material: graphite, C / C, or boron nitride.

[0014] Furthermore, a dewaxing pipe is connected to the bottom of the double-layer glue-discharging sleeve via a tee. The diameter of the outer dewaxing pipe is smaller than that of the dewaxing pipe, making it easier to insert into the dewaxing pipe and preventing glue from overflowing.

[0015] Furthermore, one end of the dewaxing pipe is connected to the furnace body, and the other end is located outside the furnace body, connecting to the outside air.

[0016] The beneficial effects of this utility model are: by setting a disposable inner dewaxing tube above the outer dewaxing tube, a double-layer glue discharge sleeve structure is formed. When the inner dewaxing tube is not discharging glue smoothly or is about to be blocked, it can be removed from the outer dewaxing tube and replaced with a new inner dewaxing tube. Alternatively, the inner dewaxing tube can be replaced after each furnace operation. This can effectively solve the technical problem of the glue discharge port being narrow and often blocked by the condensation phenomenon generated by the passing glue discharge gas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the glue discharge port of the heating element of the vacuum sintering furnace provided in this embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the structure of a double-layer rubber discharge sleeve and a dewaxing pipe.

[0019] Figure 3 This is a schematic diagram of the structural gap between the inner and outer dewaxing tubes.

[0020] Explanation of reference numerals in the attached drawings: 1. Inner dewaxing tube; 2. Outer dewaxing tube; 3. Dewaxing pipe; 4. Furnace body; 5. Furnace liner; 6. Heating element; 7. Double-layer glue removal sleeve; 8. Insulation layer. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] like Figure 1As shown, a degumming and sintering integrated furnace includes a heating element 6, a furnace body 4, a furnace liner 5, and a double-layer degumming sleeve 7. The heating element 6 is supported inside the furnace liner 5 by an insulating support. The double-layer degumming sleeve 7 is installed directly below the heating element 6 and passes through the furnace liner 5, the insulation layer 8, and the furnace body 4, connecting with the dewaxing pipe 3. The double-layer degumming sleeve 7 is divided into an inner dewaxing pipe 1 and an outer dewaxing pipe 2. The outer dewaxing pipe 2 is a tubular body with a diameter larger than that of the inner dewaxing pipe 1. It has a protruding part at one end near the heating element 6, which is stuck on the inner shell of the furnace liner 5. The inner dewaxing pipe 1 is a tubular body similar to that of the outer dewaxing pipe 2 and is installed in the inlet section of the outer dewaxing pipe. The length of the inner dewaxing pipe 1 is shorter than that of the outer dewaxing pipe 2, and the protruding part is stuck above the outer dewaxing pipe 2.

[0025] Furthermore, the inner dewaxing tube 1 and the outer dewaxing tube are in a movable fit with a gap. They are disposable items, and their inner diameter is smaller than that of the outer dewaxing tube 2. After the glue-containing gas condenses, it is easy to block the inner dewaxing tube 1. After the double-layer glue discharge sleeve 7 is blocked, the inner dewaxing tube 1 can be removed to relieve the blockage.

[0026] Furthermore, there is a gap H between the side wall of the outer dewaxing tube 2 and the side wall of the inner dewaxing tube 1, with the gap H being 0.1-1.5mm, to facilitate the removal of the inner dewaxing tube 1.

[0027] Furthermore, the distance by which the inner dewaxing tube 1 extends into the outer dewaxing tube 2 is 100-200mm.

[0028] Furthermore, the inner dewaxing tube 1 and the outer dewaxing tube of the double-layer dewaxing sleeve 7 are made of the same material, namely graphite, C / C, or boron nitride.

[0029] Furthermore, a dewaxing pipe 3 with a tee is connected to the bottom of the double-layer glue-discharging sleeve 7. The diameter of the outer dewaxing pipe 2 is smaller than that of the dewaxing pipe 3, which makes it easier to insert into the dewaxing pipe 3 and prevent the glue from overflowing.

[0030] Furthermore, one end of the dewaxing pipe 3 is connected to the furnace body 4, and the other end is located outside the furnace body 4, connecting to the outside air.

[0031] In this embodiment, the adhesive dispensing process is as follows: when the heating element 6 of the vacuum sintering furnace fires the ceramic, the previously added adhesive evaporates into the hot air. When the hot air flows out through the double-layer adhesive dispensing sleeve 7, it cools down. Because the inner dewaxing tube 1 is above the outer dewaxing tube 2, and the inner diameter of the inner dewaxing tube 1 is smaller than that of the outer dewaxing tube 2, the adhesive in the hot air will only block the inner dewaxing tube 1 after condensation. After the blockage, the inner dewaxing tube 1 can be removed to solve the blockage problem and keep the adhesive dispensing channel unobstructed.

[0032] The beneficial effects of this utility model are: by setting a disposable inner dewaxing tube 1 above the outer dewaxing tube 2, a double-layer glue discharge sleeve 7 structure is formed. After the inner dewaxing tube 1 is blocked, it is removed from the outer dewaxing tube 2, which can effectively solve the technical problem that the glue discharge port is narrow and often blocked by the condensation phenomenon generated by the passing of glue discharge gas.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A degumming and sintering integrated furnace, characterized in that: The furnace includes a heating element (6), a furnace body (4), a furnace shell (5), and a double-layer dewaxing sleeve (7). The heating element (6) is supported by an insulating support inside the furnace shell (5). The double-layer dewaxing sleeve (7) is installed directly below the heating element (6). The double-layer dewaxing sleeve (7) passes through the furnace shell (5), the insulation layer (8), and the furnace body (4) and is connected to the dewaxing pipe (3). The double-layer dewaxing sleeve (7) is divided into an inner dewaxing pipe (1) and an outer dewaxing pipe (2). The outer dewaxing pipe (2) is a tubular body with a diameter larger than that of the inner dewaxing pipe (1). There is a protruding part at one end near the heating element (6). The protruding part is stuck on the inner shell of the furnace shell (5). The inner dewaxing pipe (1) is a tubular body with the same shape as the outer dewaxing pipe (2). It is installed in the inlet section of the outer dewaxing pipe. The length of the inner dewaxing pipe (1) is shorter than that of the outer dewaxing pipe (2). The protruding part is stuck above the outer dewaxing pipe (2).

2. The degumming and sintering integrated furnace according to claim 1, characterized in that: The inner dewaxing tube (1) and the outer dewaxing tube are in a movable fit with a gap. It is a disposable product. Its inner diameter is smaller than that of the outer dewaxing tube (2). After the glue-containing gas condenses, it is easy to block the inner dewaxing tube (1). After the double-layer glue-removing sleeve (7) is blocked, the inner dewaxing tube (1) can be removed to relieve the blockage.

3. The degumming and sintering integrated furnace according to claim 2, characterized in that: There is a gap H between the side wall of the outer dewaxing tube (2) and the side wall of the inner dewaxing tube (1), and the gap H is 0.1-1.5mm, which facilitates the removal of the inner dewaxing tube (1).

4. The degumming and sintering integrated furnace according to claim 2, characterized in that: The distance from which the inner dewaxing tube (1) extends into the outer dewaxing tube (2) is 100~200mm.

5. The degumming and sintering integrated furnace according to claim 1, characterized in that: The inner and outer dewaxing tubes of the double-layer dewaxing sleeve (7) are made of the same material: graphite, C / C, or boron nitride.

6. The degumming and sintering integrated furnace according to claim 1, characterized in that: The lower part of the double-layer glue-discharging sleeve (7) is connected to the dewaxing pipe (3) of the tee. The diameter of the outer dewaxing pipe (2) is smaller than that of the dewaxing pipe (3), which makes it easier to insert into the dewaxing pipe (3) and prevent the glue from overflowing.

7. The degumming and sintering integrated furnace according to claim 6, characterized in that: One end of the dewaxing pipe (3) is connected to the furnace body (4), and the other end is located outside the furnace body (4) and connected to the outside air.

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