Ceramic dewaxing kiln

Abstract

The utility model discloses a ceramic dewaxing kiln. The kiln main body is used for forming a processing channel for dewaxing and firing a ceramic green body; the suction pipeline I is arranged on the kiln main body and is respectively communicated with a feeding end and a discharging end of the processing channel; the first suction part is arranged on the first suction pipeline and used for sucking gas in the discharging end of the machining channel into the feeding end through the first suction pipeline, and the opening and closing assembly is connected with the kiln body and used for closing the discharging end of the machining channel or opening the discharging end of the machining channel during discharging. The kiln body, the first suction pipeline, the first suction part and the opening and closing assembly cooperate to complete dewaxing firing of a ceramic green body, compared with the prior art, waste heat of waste gas is fully utilized, the waste gas is prevented from being discharged to the outside, the energy utilization rate in the machining operation process is high, and the kiln is environmentally friendly, high in practicability and suitable for wide application and popularization.

Description

Technical Field

[0001] This utility model relates to the field of ceramic processing equipment technology, and in particular, to a ceramic wax removal kiln. Background Technology

[0002] A kiln is a piece of equipment made of refractory materials used to fire products; it is an essential facility in ceramic art forming. In the new electronic ceramics manufacturing process, the removal of wax and the large-scale sintering of ceramics both require the use of kilns.

[0003] For example, Chinese utility model patent CN215413164U discloses a sintering and wax removal kiln, including a sintering furnace unit and a wax removal furnace unit located to the side of the sintering furnace unit. The sintering furnace unit is connected to the wax removal furnace unit and discharges high-temperature sintering waste heat to the wax removal furnace unit for wax removal. The sintering furnace unit is equipped with a natural gas combustion heating device for providing high-temperature sintering. The sintering furnace unit and / or the wax removal furnace unit are equipped with a temperature control device for adjusting the temperature gradient inside the furnace by controlling the amount of high-temperature airflow drawn outward from the furnace. This allows for real-time monitoring and control of the temperature gradient within the sintering furnace unit and / or the wax removal furnace unit, thereby ensuring that the temperature gradient during the sintering and / or wax removal processes meets product requirements and ensuring the quality of the obtained ceramic products.

[0004] However, since the core function of a kiln is to vaporize or burn wax in a high-temperature environment, ceramics will generate a large amount of waste gas with residual heat during the wax removal process. Although current kilns use methods to extract waste gas from the kiln insulation zone to the kiln preheating zone in order to utilize the residual heat of the waste gas to preheat the ceramic body and minimize the discharge of waste gas outside the kiln, because the kiln outlet is open and the internal cavity of the kiln is connected to the outside, some waste gas will always be discharged to the outside, causing environmental pollution and energy waste. Utility Model Content

[0005] This utility model provides a ceramic wax removal kiln to solve the technical problem that the waste gas generated during the wax removal process of existing kilns is emitted into the outside world, causing environmental pollution and energy waste.

[0006] According to one aspect of the present invention, a ceramic dewaxing kiln is provided, comprising a kiln body for forming a processing channel for dewaxing and firing ceramic blanks, a suction pipe arranged on the kiln body and respectively connected to the feed end and discharge end of the processing channel, a suction component arranged on the suction pipe for drawing gas from the discharge end of the processing channel to the feed end through the suction pipe, and an opening and closing component connected to the kiln body for closing the discharge end of the processing channel or opening the discharge end of the processing channel during unloading.

[0007] As a further improvement to the above technical solution:

[0008] Furthermore, the opening and closing assembly includes a fixed shell connected to the kiln body and a valve movably arranged on the fixed shell. The inner cavity of the fixed shell is connected to the discharge end of the processing channel, and the valve is used to open or close the inner cavity of the fixed shell.

[0009] Furthermore, the valve is equipped with push-pull handles.

[0010] Furthermore, the processing channel is arranged in sequence along the material conveying direction with a preheating zone, a wax removal zone, a firing zone, and a heat preservation zone. The preheating zone is connected to the air outlet of the first suction pipe, and the heat preservation zone is connected to the air inlet of the first suction pipe.

[0011] Furthermore, the preheating zone is vertically arranged with a combustion preheating layer and a preheating material conveying layer, and the combustion preheating layer is connected to the gas outlet of the suction pipe.

[0012] Furthermore, the suction pipe includes a main suction pipe connected to the suction component and communicating with the insulation zone, and multiple suction branch pipes connected to the main suction pipe and communicating with the combustion preheating layer. The multiple suction branch pipes are arranged sequentially along the material conveying direction.

[0013] Furthermore, the ceramic wax-removing kiln also includes a secondary combustion zone located above the kiln body and connected to the wax-removing zone, a second suction pipe connected to the secondary combustion zone and the heat preservation zone respectively, and a second suction component installed on the second suction pipe for drawing gas from the secondary combustion zone to the heat preservation zone through the second suction pipe.

[0014] Furthermore, the main body of the kiln is provided with multiple ventilation holes that connect the secondary combustion zone and the wax removal zone, and the multiple ventilation holes are arranged at intervals along the material conveying direction.

[0015] Furthermore, the upper wall of the secondary combustion zone is inclined upward along the material conveying direction, and the air inlet of the second suction pipe is connected to the uppermost end of the secondary combustion zone.

[0016] Furthermore, at least one of the following locations is provided with a heat-resistant plate at the top: between the preheating zone and the wax removal zone, between the wax removal zone and the firing zone, and between the firing zone and the heat preservation zone. This plate is designed to block heat within the zone and stabilize the temperature within the zone by utilizing the principle of hot air rising.

[0017] This utility model has the following beneficial effects:

[0018] This utility model relates to a ceramic wax-removing kiln. The kiln body forms a processing channel for wax removal and firing of ceramic blanks. During the wax removal process, a large amount of waste gas with residual heat is generated within the processing channel. At this time, the suction component operates to draw the gas, including the waste gas, from the discharge end of the processing channel to the feed end. Because the opening and closing assembly closes the discharge end of the processing channel, a vacuum negative pressure is generated at the discharge end, causing the feed end of the processing channel to draw in external gas and drive the waste gas to move along the conveying direction within the processing channel, thus achieving the desired waste gas removal. The circulating flow fully utilizes the preheating of waste gas, avoiding energy waste while achieving zero waste gas emission and preventing environmental pollution. After the ceramic wax removal is completed, the opening and closing components open the discharge end of the processing channel to unload the finished ceramic product. This solution completes the wax removal and firing of the ceramic blank through the coordinated operation of the kiln body, suction pipe 1, suction component 1, and opening and closing components. Compared with existing technologies, it makes full use of the waste heat of waste gas and prevents waste gas from being emitted to the outside. The energy utilization rate during the processing is high, and it is green and environmentally friendly. It is highly practical and suitable for widespread promotion and application.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a ceramic wax-removing kiln according to a preferred embodiment of the present invention;

[0022] Figure 2 This is a first cross-sectional schematic diagram of a ceramic wax-removing kiln according to a preferred embodiment of the present invention;

[0023] Figure 3 This is a second cross-sectional schematic diagram of a ceramic wax-removing kiln according to a preferred embodiment of the present invention.

[0024] Legend:

[0025] 100. Kiln body; 110. Preheating zone; 120. Wax removal zone; 130. Firing zone; 140. Insulation zone; 150. Temperature barrier plate; 200. Suction pipe one; 210. Main suction pipe; 220. Suction branch pipe; 300. Suction component one; 400. Opening and closing assembly; 410. Fixed shell; 420. Valve; 421. Push-pull handle; 510. Secondary combustion zone; 520. Suction pipe two; 530. Suction component two; 540. Vent hole. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] like Figure 1 and Figure 2 As shown, the ceramic dewaxing kiln of this embodiment includes a kiln body 100 for forming a processing channel for dewaxing and firing ceramic blanks, a suction pipe 200 arranged on the kiln body 100 and connected to the feed end and discharge end of the processing channel respectively, a suction component 300 arranged on the suction pipe 200 for drawing gas from the discharge end of the processing channel to the feed end through the suction pipe 200, and an opening and closing component 400 connected to the kiln body 100 for closing the discharge end of the processing channel during operation or opening the discharge end of the processing channel during unloading.

[0028] like Figure 1 and Figure 2 As shown, specifically, the ceramic wax-removing kiln of this utility model forms a processing channel for wax removal and firing of ceramic blanks through the kiln body 100. During the wax removal process of the ceramic blanks, a large amount of waste gas with residual heat is generated in the processing channel. At this time, the suction component 300 operates to draw the gas, including the waste gas, from the discharge end of the processing channel to the feed end of the processing channel. Since the opening and closing component 400 closes the discharge end of the processing channel, a vacuum negative pressure is generated at the discharge end of the processing channel, causing the feed end of the processing channel to draw in external gas and drive the waste gas to move along the conveying direction in the processing channel, thereby realizing the removal of waste gas. The circulating flow fully utilizes the preheating of waste gas, avoiding energy waste while achieving the effect of no waste gas emission and preventing environmental pollution. After the ceramic wax removal is completed, the opening and closing component 400 opens the discharge end of the processing channel to unload the finished ceramic product. This solution completes the wax removal and firing of the ceramic blank through the coordinated operation of the kiln body 100, suction pipe 200, suction component 300 and opening and closing component 400. Compared with the existing technology, it makes full use of the waste heat of waste gas and prevents waste gas from being emitted to the outside. The energy utilization rate during the processing is high, and it is green and environmentally friendly. It is practical and suitable for widespread promotion and application.

[0029] It should be understood that in this embodiment, the discharge end of the processing channel is closed by the opening and closing component 400, and the suction component 300 is used to make the feed end of the processing channel self-suction to replenish the air volume balance, so as to achieve no waste gas emission during the processing.

[0030] Optionally, the suction component 300 is a fan.

[0031] It should be understood that the waste gas generated during the wax removal process of ceramic blanks can often be combusted again to release heat. By circulating the waste gas, it can be fully combusted, maximizing energy utilization and avoiding energy waste.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, the opening and closing assembly 400 includes a fixed housing 410 connected to the kiln body 100 and a valve 420 movably arranged on the fixed housing 410. The inner cavity of the fixed housing 410 is connected to the discharge end of the processing channel, and the valve 420 is used to open or close the inner cavity of the fixed housing 410. Specifically, the valve 420 is arranged vertically and can be pushed and pulled open horizontally. When the ceramic wax removal kiln is working, the valve 420 closes the inner cavity of the fixed housing 410, and together with the fixed housing 410, seals the discharge end of the processing channel. At this time, the waste gas generated during the ceramic wax removal process is blocked by the fixed housing 410 and the valve 420 and cannot flow to the outside. Under the suction action of the suction component 300, it flows to the feed end of the processing channel through the suction pipe 200, realizing the circulation of waste gas. When the ceramic wax removal kiln stops working, the valve 420 opens the inner cavity of the fixed housing 410, and the finished ceramic product can be taken out from the inner cavity of the fixed housing 410.

[0033] Optionally, a sealing structure is provided between the valve 420 and the fixed housing 410 to prevent exhaust gas from flowing out from the gap between the valve 420 and the fixed housing 410.

[0034] Optionally, a sealing structure is provided between the valve 420 and the kiln body 100 to prevent exhaust gas from flowing out from the gap between the valve 420 and the kiln body 100.

[0035] Optionally, the sealing structure is one of high-temperature adhesive or O-ring.

[0036] Optionally, the kiln shell is provided with a horizontally arranged slide rail that slides in cooperation with the door 420.

[0037] It should be understood that the discharge end of a closed processing channel refers to preventing waste gas from flowing to the outside through the discharge end of the processing channel.

[0038] like Figure 1 As shown, in this embodiment, the valve 420 is provided with a push-pull handle 421. Specifically, the push-pull handle 421 facilitates the operator to push and pull with force.

[0039] like Figure 2As shown, in this embodiment, the processing channel is sequentially arranged with a preheating zone 110, a wax removal zone 120, a firing zone 130, and a heat preservation zone 140 along the material conveying direction. The preheating zone 110 is connected to the outlet end of the suction pipe 200, and the heat preservation zone 140 is connected to the inlet end of the suction pipe 200. Specifically, the preheating zone 110 is used to form a preheating temperature gradient to preheat the ceramic blank, the wax removal zone 120 is used to form a preheating wax removal gradient to remove wax from the ceramic blank, the firing zone 130 is used to fire the ceramic blank at high temperature into a finished ceramic product, and the heat preservation zone 140 is used to keep the finished ceramic product warm. When the ceramic wax removal kiln is working, the suction unit 300 works to draw air from the heat preservation zone 140 and then draw it into the preheating zone 110 through the suction pipe 200, and realize the circulation of waste gas under negative pressure. Optionally, the depth length of each area can be designed, and the dwell time of the material can be adjusted in combination with the material's travel speed, thereby adjusting the temperature gradient for material wax removal.

[0040] It should be understood that the feed end of the processing channel is located in the preheating zone 110, and the discharge end of the processing channel is located in the heat preservation zone 140.

[0041] like Figure 2 As shown, in this embodiment, the preheating zone 110 is vertically arranged with a combustion preheating layer and a preheating conveying layer, and the combustion preheating layer is connected to the outlet end of the suction pipe 200. Specifically, when the ceramic wax removal kiln is working, the combustion preheating layer burns to provide heat for preheating the ceramic blank. The ceramic blank moves within the preheating conveying layer. The suction unit 300 operates, and the waste gas flows into the combustion preheating layer through the suction pipe 200, where it burns to provide heat, thereby reducing the energy consumed by the combustion preheating layer. The waste gas then flows back into the preheating conveying layer to circulate after drawing in external gas in the processing channel. Optionally, the kiln body 100 is provided with air guide holes connecting the combustion preheating layer and the preheating conveying layer.

[0042] like Figure 2 As shown, in this embodiment, the suction pipe 200 includes a main suction pipe 210 connected to the suction component 300 and communicating with the insulation zone 140, and multiple suction branch pipes 220 connected to the main suction pipe 210 and communicating with the combustion preheating layer. The multiple suction branch pipes 220 are arranged sequentially along the material conveying direction. Specifically, since the multiple suction branch pipes 220 are arranged sequentially along the material conveying direction, and the gas in the main suction pipe 210 is in the opposite direction to the material conveying direction, the air intake of the multiple suction branch pipes 220 increases along the material conveying direction, and the heating effect on the preheating zone 110 also increases along the material conveying direction, so that the actual preheating temperature gradient of the preheating zone 110 matches the preheating temperature gradient required by the design, thereby improving the quality of ceramic wax removal.

[0043] like Figure 3As shown, in this embodiment, the ceramic wax-removing kiln further includes a secondary combustion zone 510 disposed above the kiln body 100 and connected to the wax-removing zone 120, a second suction pipe 520 connected to both the secondary combustion zone 510 and the insulation zone 140, and a second suction component 530 disposed on the second suction pipe 520 for drawing gas from the secondary combustion zone 510 to the insulation zone 140 via the second suction pipe 520. Specifically, the temperature of the exhaust gas generated during the ceramic wax removal process gradually increases along the conveying direction, and after flowing through the wax-removing zone 120, it flows to the secondary combustion zone 510, causing the low-temperature exhaust gas and high-temperature exhaust gas to mix and undergo secondary combustion. At the same time, the second suction component 530 operates to draw gas from the secondary combustion zone 510 to the insulation zone 140 via the second suction pipe 520, thereby insulating the ceramic finished product in the insulation zone 140 and improving energy utilization.

[0044] Optionally, the dewaxing temperature gradient within the dewaxing zone 120 is 150℃-700℃.

[0045] It should be understood that the waste gas generated during the ceramic dewaxing process cannot be fully combusted below 300℃.

[0046] Optionally, suction component 2530 can be a fan.

[0047] like Figure 3 As shown, in this embodiment, the kiln body 100 has multiple vents 540 connecting the secondary combustion zone 510 and the wax discharge zone 120. The multiple vents 540 are arranged sequentially at intervals along the material conveying direction. Specifically, the multiple vents 540 allow the waste gas flowing through the wax discharge zone 120 and the waste gas generated in the wax discharge zone 120 to flow into the secondary combustion zone 510, so that waste gases of different temperatures merge and undergo secondary combustion in the secondary combustion zone 510.

[0048] like Figure 3 As shown, in this embodiment, the upper wall of the secondary combustion zone 510 is inclined upwards along the material conveying direction, and the air inlet of the second suction pipe 520 is connected to the uppermost end of the secondary combustion zone 510. Specifically, since the upper wall of the secondary combustion zone 510 is inclined upwards along the material conveying direction, the gas entering the secondary combustion zone 510 also flows inclined upwards along the material conveying direction, thereby allowing the low-temperature gas and high-temperature gas to merge and burn completely. Then, the gas flows to the heat preservation zone 140 through the second suction pipe 520, making full use of the waste heat of the exhaust gas and improving energy utilization.

[0049] like Figure 2As shown, in this embodiment, at least one of the following locations—between the preheating zone 110 and the wax removal zone 120, between the wax removal zone 120 and the firing zone 130, and between the firing zone 130 and the heat preservation zone 140—is equipped with a temperature-resistant plate 150. This plate is designed to block heat within the zone and stabilize the temperature within the zone by utilizing the principle of rising hot airflow. Specifically, by utilizing the principle of rising hot airflow, temperature-resistant plates 150 are arranged between each zone to lock the temperature gradient within each zone, thereby stabilizing the temperature gradient within the processing channel. Furthermore, due to different material formulations, the temperature gradient required for wax removal varies accordingly. Therefore, by adjusting the temperature-resistant plates 150, the airflow velocity and flow rate can be controlled, thereby controlling the temperature within each zone and ensuring that the temperature gradient within the processing channel matches the temperature gradient required for wax removal from the ceramic body. Optionally, the temperature-resistant plates 150 can be adjusted vertically and then fixed.

[0050] It should be understood that, Figure 2 and Figure 3 The arrows shown indicate the direction of gas flow.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ceramic dewaxing kiln characterized by, The system includes a kiln body (100) for forming a processing channel for dewaxing and firing ceramic blanks, a suction pipe (200) arranged on the kiln body (100) and connected to the feed end and discharge end of the processing channel respectively, a suction component (300) arranged on the suction pipe (200) for drawing gas from the discharge end of the processing channel to the feed end through the suction pipe (200), and an opening and closing component (400) connected to the kiln body (100) for closing the discharge end of the processing channel or opening the discharge end of the processing channel. The processing channel is provided with a preheating zone (110), a wax removal zone (120), a firing zone (130) and a heat preservation zone (140) in sequence along the material conveying direction. The preheating zone (110) is connected to the air outlet of the first suction pipe (200), and the heat preservation zone (140) is connected to the air inlet of the first suction pipe (200). The preheating zone (110) is vertically arranged with a combustion preheating layer and a preheating material conveying layer, and the combustion preheating layer is connected to the gas outlet of the suction pipe (200).

2. The ceramic dewaxing kiln of claim 1, wherein, The opening and closing assembly (400) includes a fixed housing (410) connected to the kiln body (100) and a valve (420) movably arranged on the fixed housing (410). The inner cavity of the fixed housing (410) is connected to the discharge end of the processing channel, and the valve (420) is used to open or close the inner cavity of the fixed housing (410).

3. The ceramic dewaxing kiln of claim 2, wherein, The valve (420) is equipped with a push-pull handle (421).

4. The ceramic dewaxing kiln according to any one of claims 1 to 3, characterized in that The first suction pipe (200) includes a main suction pipe (210) connected to the first suction component (300) and communicating with the insulation zone (140), and multiple suction branch pipes (220) connected to the main suction pipe (210) and communicating with the combustion preheating layer. The multiple suction branch pipes (220) are arranged sequentially along the material conveying direction.

5. The ceramic dewaxing kiln according to any one of claims 1 to 3, wherein The ceramic wax-removing kiln also includes a secondary combustion zone (510) located above the kiln body (100) and connected to the wax removal zone (120), a second suction pipe (520) connected to the secondary combustion zone (510) and the heat preservation zone (140) respectively, and a second suction component (530) installed on the second suction pipe (520) for drawing gas from the secondary combustion zone (510) to the heat preservation zone (140) through the second suction pipe (520).

6. The ceramic dewaxing kiln of claim 5, wherein, The kiln body (100) has multiple ventilation holes (540) connecting the secondary combustion zone (510) and the wax removal zone (120), and the multiple ventilation holes (540) are arranged sequentially at intervals along the material conveying direction.

7. The ceramic dewaxing kiln of claim 6, wherein, The upper wall of the secondary combustion zone (510) is inclined upward along the material conveying direction, and the air inlet of the second suction pipe (520) is connected to the uppermost end of the secondary combustion zone (510).

8. The ceramic dewaxing kiln according to any one of claims 1 to 3, wherein At least one of the following locations is provided with a heat-resistant plate (150) for blocking heat within the area to stabilize the temperature within the area based on the principle of hot air rising.

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