Tunnel furnace

Abstract

The tunnel furnace comprises a furnace body, a drying device, a negative pressure fan, an exhaust pipe and a conveying device, the conveying device penetrates through the furnace body, an inner cavity of the furnace body is sequentially divided into a preheating section, a sintering section and a cooling section, a heating cavity is formed in the bottom of the sintering section, and a cooling cavity is formed in the bottom of the cooling section. The drying device is arranged in the heating cavity in the direction of the furnace body, a heat conduction pipeline is arranged in the side wall of the sintering section, the sintering section is communicated with the heating cavity through the heat conduction pipeline, and a through hole is formed in the side, facing the inner cavity of the furnace body, of the heat conduction pipeline. The ceramic body drying device has the advantages that air in the cooling section is pumped out through the negative pressure fan and introduced into the heating cavity, the air flow speed of the cooling section is increased, and the ceramic body drying efficiency in the cooling section is improved; and the drying device heats air in the heating cavity, and the hot air passes through the through holes in the vertical direction of the heat conduction pipeline to dry the multilayer ceramic green body, so that the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of ceramic production equipment technology, and in particular to a tunnel furnace. Background Technology

[0002] A tunnel oven is a tunnel-type mechanical device that uses heat conduction, convection, and radiation to bake materials. The baking chamber is a long and narrow tunnel, typically 80cm to 140cm wide, with a continuously operating conveyor system inside.

[0003] For example, a pusher-type energy-saving tunnel furnace for sintering ceramic products, disclosed in CN210532998U, heats a single layer of ceramic blanks with a single heating rod, which not only reduces energy consumption but also ensures temperature uniformity within the furnace, thus ensuring the consistency of the technical specifications of the fired ceramic products.

[0004] However, the aforementioned tunnel furnace only achieves the drying effect by continuously passing a single layer of ceramic blank through the tunnel furnace, resulting in low production efficiency. Furthermore, the ceramic blank is cooled by natural heat dissipation after passing through the tunnel furnace, further reducing production efficiency. Utility Model Content

[0005] In view of the above-mentioned prior art, the present invention provides a tunnel furnace, which mainly solves the technical problems existing in the background art.

[0006] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:

[0007] A tunnel furnace includes a furnace body, a drying device, a negative pressure fan, an exhaust pipe, and a conveying device. The conveying device passes through the furnace body. The furnace body has an inlet and an outlet at both ends. The furnace interior is divided into a sintering section and a cooling section. A heating chamber is located at the bottom of the sintering section. The drying device is positioned within the heating chamber along the direction of the furnace body. A heat-conducting pipe is located within the side wall of the sintering section, connecting the sintering section to the heating chamber via the heat-conducting pipe. The heat-conducting pipe has several through holes along its vertical direction on the side facing the furnace interior. The negative pressure fan is located at the bottom of the cooling section, and is connected to the heating chamber via the exhaust pipe.

[0008] Preferably, the drying device is a heating rod.

[0009] Preferably, the transport device includes a track and a transport trolley, with the transport trolley mounted on the track.

[0010] Preferably, a first filter screen is provided at the connection between the exhaust pipe and the heating chamber.

[0011] Preferably, the outer surface of the sintering section is provided with a heat insulation layer.

[0012] Preferably, the sintering section is provided with a preheating section near the discharge port, and the top of the preheating section is provided with a waste heat return pipeline. The waste heat return pipeline includes an exhaust pipe and an exhaust fan. The exhaust fan is located at the top of the sintering section, and the preheating section is connected to the exhaust fan through the exhaust pipe.

[0013] Preferably, the exhaust pipe is provided with a second filter screen.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. By drawing air out of the cooling section and introducing it into the heating chamber through a negative pressure fan, the air flow rate in the cooling section is accelerated, thereby improving the drying efficiency of the ceramic blank in the cooling section.

[0016] 2. The drying device heats the air in the heating chamber and then dries the multi-layer ceramic blanks through heat conduction pipes, thereby improving production efficiency.

[0017] 3. The hot air ejected from the vertical through-holes in the heat conduction pipes ensures temperature uniformity within the sintering section, thereby improving product quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a tunnel furnace according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the side structure of a tunnel furnace according to an embodiment of this application.

[0020] Explanation of icon numbers:

[0021] 1. Furnace body; 2. Negative pressure fan; 3. Exhaust pipe; 4. Feed inlet; 5. Discharge outlet; 6. Preheating section; 7. Sintering section; 8. Cooling section; 9. Heating chamber; 10. Heat conduction pipe; 11. Through hole; 12. Heating rod; 13. Track; 14. Transport trolley; 15. First filter screen; 16. Exhaust pipe; 17. Exhaust fan; 18. Second filter screen. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in this specification of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0023] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Example 1

[0025] Please refer to the attached document. Figure 1-2 This application provides a tunnel furnace, including a furnace body 1, a drying device, a negative pressure fan 2, an exhaust pipe 3, and a conveying device. The conveying device passes through the furnace body 1. The furnace body 1 has a feed inlet 4 and a discharge outlet 5 at both ends. The inner cavity of the furnace body 1 is divided into a sintering section 7 and a cooling section 8. The bottom of the sintering section 7 is provided with a heating chamber 9. The drying device is located in the heating chamber 9 along the direction of the furnace body 1. The side wall of the sintering section 7 is provided with a heat-conducting pipe 10. The sintering section 7 is connected to the heating chamber 9 through the heat-conducting pipe 10. The heat-conducting pipe 10 has several through holes 11 on the side facing the inner cavity of the furnace body 1 in the vertical direction. The bottom of the cooling section 8 is provided with the negative pressure fan 2. The negative pressure fan 2 is connected to the heating chamber 9 through the exhaust pipe 3.

[0026] Multiple layers of ceramic blanks can be stacked on a transport device according to the height of the tunnel furnace cavity. The transport device transports the ceramic blanks from the feed port 4 to the discharge port 5, passing through the sintering section 7 and the cooling section 8 in sequence. After the ceramic blanks enter the sintering section 7, the drying device in the bottom heating chamber 9 heats the air in the heating chamber 9 and dries the multiple layers of ceramic blanks through the heat conduction pipe 10, which improves production efficiency. At the same time, the hot air ejected from the through holes 11 in the vertical direction of the heat conduction pipe 10 ensures the temperature uniformity in the sintering section 7 and improves the production quality of the product. The ceramic blanks dried in the sintering section 7 are transported to the cooling section 8. The air in the cooling section 8 is extracted by the negative pressure fan 2 and introduced into the heating chamber 9 through the exhaust pipe 3, which accelerates the air flow rate in the cooling section 8 and improves the drying efficiency of the ceramic blanks in the cooling section 8.

[0027] Specifically, the drying device is a heating rod 12. The function of the heating rod 12 is to heat the air and provide a stable heat source for the ceramic body.

[0028] Specifically, the transport device includes a track 13 and a transport trolley 14, with the transport trolley 14 mounted on the track 13. Ceramic blanks can be freely stacked onto the transport trolley 14, which then transports them along the track 13 through a tunnel furnace for drying.

[0029] Specifically, a first filter screen 15 is provided at the connection between the exhaust pipe 3 and the heating chamber 9. While the negative pressure fan 2 draws air out of the cooling section 8, it also draws dust from the furnace body 1 into the ventilation pipe, achieving the effect of dust removal from the furnace body 1. The dust is intercepted by the first filter screen 15, which is beneficial for subsequent cleaning work. At the same time, it prevents dust from re-entering the furnace body 1 through the heating chamber 9 and the heat conduction pipe 10, thus avoiding increasing the difficulty of subsequent cleaning.

[0030] Specifically, the outer surface of the sintering section 7 is provided with a heat insulation layer. The function of the heat insulation layer is to reduce the temperature loss of the sintering section 7 and reduce energy consumption.

[0031] Example 2

[0032] Please refer to the attached document. Figure 1-2The difference between this embodiment and Embodiment 1 is that a preheating section 6 is provided near the discharge port 5 in the sintering section 7. A waste heat return pipeline is provided at the top of the preheating section 6, including an exhaust pipe 16 and an exhaust fan 17. The exhaust fan 17 is located at the top of the sintering section 7, and the preheating section 6 is connected to the exhaust fan 17 via the exhaust pipe 16. By setting up the preheating section 6 before the sintering section 7, hot air from the sintering section 7 is introduced into the preheating section 6 through the exhaust fan 17 and the exhaust pipe 16 to preheat the ceramic blank within the preheating section 6. This recovers and utilizes the waste heat in the sintering section 7, improving thermal energy utilization, reducing the energy consumption required for heating the ceramic blank in the sintering section 7, reducing the time the ceramic blank spends in the sintering section 7, and improving sintering efficiency.

[0033] Specifically, the exhaust pipe 16 is equipped with a second filter screen 18. The second filter screen 18 intercepts the dust drawn into the exhaust pipe 3, preventing the dust from re-entering the furnace body 1 and increasing the difficulty of subsequent cleaning of the furnace body 1.

[0034] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the protection scope of the stated claims.

Claims

1. A tunnel furnace, characterized in that, The utility model relates to a sintering device, including stove, drying device, negative pressure fan, exhaust pipe and transport device, the transport device passes through the stove, the both ends of stove are equipped with feeding port and discharge port respectively, the stove inner chamber is divided into sintering section and cooling section in proper order, the bottom of sintering section is equipped with heating cavity, drying device is located in heating cavity along the direction of stove, the sidewall of sintering section is equipped with heat conduction pipeline, sintering section is communicated with heating cavity through heat conduction pipeline, the side of heat conduction pipeline facing stove inner chamber is equipped with a plurality of through -hole along vertical direction, the bottom of cooling section is equipped with negative pressure fan, negative pressure fan is communicated with heating cavity through exhaust pipe.

2. A tunnel furnace according to claim 1, characterised in that The drying device is a heating rod.

3. A tunnel furnace according to claim 1, wherein The transport device includes a track and a transport trolley.

4. The tunnel furnace of claim 1, wherein, The exhaust pipe is connected to the heating cavity and is provided with a first filter screen.

5. The tunnel furnace of claim 1 wherein, The sintering section is provided with a heat preservation layer on the outer surface.

6. A tunnel furnace according to claim 1, wherein The sintering section is provided with a preheating section near the discharge port, the preheating section is provided with a waste heat return pipeline on the top, the waste heat return pipeline includes an exhaust pipe and an exhaust fan, the exhaust fan is arranged on the top of the sintering section, and the preheating section is communicated with the exhaust fan through the exhaust pipe.

7. A tunnel furnace according to claim 6, characterised in that The exhaust pipe is provided with a second filter screen.

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