A tunnel furnace

Abstract

This application discloses a tunnel furnace, including: a track, a transmission assembly, a conveyor mounted on the transmission assembly, and a furnace body inverted on the transmission assembly. The inverted area of ​​the furnace body is sequentially divided into a preheating zone, a high-temperature zone, a high-temperature partition zone, and a cooling zone along the length of the track. The conveyor sequentially enters the preheating zone, the high-temperature zone, the high-temperature partition zone, and the cooling zone. A first movable door capable of opening and closing to block heat transfer is provided between the high-temperature zone and the high-temperature partition zone, and a second movable door capable of opening and closing to block heat transfer is provided between the high-temperature partition zone and the cooling zone. Several sets of flame-throwing devices are provided in the high-temperature zone. A heat recovery device connected to the high-temperature zone is provided at the upper end of the high-temperature partition zone. This application can improve the efficiency of heat utilization, reduce energy consumption, and achieve energy saving. The isolation between the high-temperature and cooling zones improves the controllability of cooling and enhances product quality. Overall, it achieves improved quality and efficiency, energy saving, and cost reduction.

Description

Technical Field

[0001] This invention relates to heat treatment equipment, and more particularly to a tunnel furnace. Background Technology

[0002] As a highly efficient and stable heat treatment equipment, tunnel furnaces play a crucial role in modern industrial production lines. However, despite their excellent performance in many aspects, tunnel furnaces still have some shortcomings that limit their performance and application scope. These shortcomings include: (1) High energy loss. In addition to using part of the heat generated by the tunnel furnace to heat the object, part of the heat energy is wasted by entering the air; (2) Large temperature difference in the heating environment of the object. The object is usually directly introduced into the natural cooling environment of the air after being heated at high temperature, which causes the temperature of the object to drop sharply from high temperature to low temperature, resulting in high-temperature deformation and incomplete low-temperature porcelainization; (3) Low level of intelligence. Although tunnel furnaces have been widely used in automated production lines, their level of intelligence still needs to be improved. Traditional tunnel furnaces lack intelligent control systems and sensor technology, making it impossible to achieve real-time monitoring and automatic adjustment, resulting in certain fluctuations in production efficiency and product quality. Summary of the Invention

[0003] This application provides a tunnel furnace, the main purpose of which is to solve: (1) the problem of low thermal energy utilization efficiency of existing tunnel furnaces; (2) the defects of high-temperature deformation and incomplete low-temperature porcelainization of heated materials due to excessive temperature difference in the tunnel furnace.

[0004] The technical solution of this application is as follows:

[0005] A tunnel furnace includes: a track, a transmission assembly disposed on the track, a conveyor disposed on the transmission assembly, and a furnace body inverted on the transmission assembly. The area of ​​the furnace body inverted is divided into a preheating zone, a high-temperature zone, a high-temperature dividing zone, and a cooling zone along the length of the track.

[0006] The conveyor, powered by the transmission components, sequentially enters the preheating zone, high-temperature zone, high-temperature dividing zone, and cooling zone along the track. A first movable door that can be opened and closed to block heat transfer is installed between the high-temperature zone and the high-temperature dividing zone, and a second movable door that can be opened and closed to block heat transfer is installed between the high-temperature dividing zone and the cooling zone. Several sets of flame-spraying devices are installed in the high-temperature zone. A heat recovery device connected to the high-temperature zone is installed at the upper end of the high-temperature dividing zone.

[0007] Several sets of flame-spraying devices heat the high-temperature zone, and a portion of the heat energy flows to the preheating zone. The first and second movable doors are closed, and the object to be heated enters from the preheating zone. After being preheated by the conveying mechanism, the object is then conveyed to the high-temperature zone for heating. The first movable door opens, and the object is then conveyed to the high-temperature dividing zone. The second movable door opens, and the first movable door closes. After being cooled in the high-temperature dividing zone, the heated object enters the natural cooling zone. A portion of the heat transferred from the high-temperature zone to the high-temperature dividing zone is returned to the high-temperature zone by the heat recovery device.

[0008] In some embodiments, the furnace body is in the shape of an inverted U-shape and includes three layers from the inside out: an inner layer of high-temperature reflective material and refractory material, a middle layer of heat insulation material, and an outer layer of infrared reflective material.

[0009] In some embodiments, the refractory material is refractory brick or mullite brick; the thermal insulation material is high-alumina cotton or aerogel.

[0010] In some embodiments, the tunnel furnace is also connected to an electrical control cabinet.

[0011] In some embodiments, the tunnel furnace is also connected to an intelligent control cabinet and software.

[0012] In some embodiments, the heat recovery device includes an exhaust fan and a recovery pipe connected together.

[0013] In some embodiments, the heat recovery device includes an exhaust fan and a recovery pipe connected together.

[0014] The technical effects of this application are as follows: (1) Since a high-temperature dividing zone is set between the high-temperature zone and the natural cooling zone of the tunnel furnace, the heated material is cooled in the high-temperature dividing zone after being heated in the high-temperature environment, and then cooled in the natural cooling zone, so as to achieve a gradual decrease in temperature and overcome the defects of high-temperature deformation and low-temperature porcelainization of the heated material; (2) Each flame-spraying device is connected to a temperature controller and a power controller, so that the temperature and power of the natural gas sprayed by each flame-spraying device are precisely controlled, and the heating quality is improved; (3) At the top outside of the high-temperature dividing zone of the furnace body, the waste heat in the high-temperature dividing zone is returned to the high-temperature zone for reuse through the exhaust device, reducing the waste of heat energy; (4) The intelligent control cabinet is responsible for monitoring and adjusting the temperature, transmission speed of the conveyor belt assembly and other parameters in the tunnel furnace, and the real-time opening and closing of the first and second movable doors, so as to ensure the normal operation of the equipment and the stability of the processing process; (5) The electrical control cabinet is used to monitor the operating status of the tunnel furnace. Once an abnormality is found, the corresponding protection measures are immediately activated to ensure the safety of the equipment and personnel. Attached Figure Description

[0015] Figure 1 This is a top view of the tunnel furnace;

[0016] Figure 2 This is the front view of the tunnel furnace;

[0017] Figure 3 This is a left-side view of the tunnel furnace.

[0018] Figure 4 for Figure 2 Enlarged view of point A;

[0019] Figure 5 for Figure 2 Enlarged view of point B. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] refer to Figures 1-5 A tunnel furnace, comprising: a tunnel furnace characterized in that it includes: a track, a transmission assembly 10 disposed on the track, a conveyor 153 disposed on the transmission assembly, and a furnace body 20 inverted on the transmission assembly. The inverted area of ​​the furnace body 20 is sequentially divided into a preheating zone, a high-temperature zone, a high-temperature dividing zone, and a cooling zone along the length of the track (exemplarily from right to left in this application). The furnace body 20 has a roughly inverted "U" shape and is inverted on the upper surface of the transmission belt assembly 10.

[0023] The conveyor 153 carries the heated object sequentially into the preheating zone, high temperature zone, high temperature dividing zone, and cooling zone along the track using the power provided by the transmission component 10. A first movable door 30 that can be opened and closed to block the transfer of heat energy is provided between the high temperature zone and the high temperature dividing zone, and a second movable door 40 that can be opened and closed to block the transfer of heat energy is provided between the high temperature dividing zone and the cooling zone. Several sets of flame-spraying devices 50 are provided in the high temperature zone. At the upper end of the high temperature dividing zone, a heat recovery device connected to the high temperature zone is provided. The heat recovery device consists of an exhaust device 60 and a recovery pipe 61.

[0024] Several sets of flame-spraying devices 50 heat the high-temperature zone, and a portion of the heat energy flows to the preheating zone. The first movable door 30 and the second movable door 40 are closed, and the object to be heated enters from the preheating zone. The object to be heated is transported to the preheating zone by the conveyor 153 and preheated. It is then transported to the high-temperature zone for heating. The first movable door 30 is opened, and the object is then transported to the high-temperature dividing zone. The second movable door 40 is opened, and the first movable door 30 is closed. After being cooled in the high-temperature dividing zone, the heated object enters the natural cooling zone. A portion of the heat transferred from the high-temperature zone to the high-temperature dividing zone is returned to the high-temperature zone by the heat recovery device.

[0025] Each set of flame-emitting devices is controlled by a temperature controller (not shown) and a power controller (not shown) to regulate its flame temperature and flame power.

[0026] First, several sets of flame-spraying devices 50 are used to heat the high-temperature zone. Since the high-temperature zone and the preheating zone are connected, the preheating zone will also heat up, but the temperature will not be as high as that of the high-temperature zone. During the heating process of the high-temperature zone, the first movable door 30 and the second movable door 40 are closed to reduce the flow of heat from the high-temperature zone to the high-temperature partition zone, and to reduce the flow of heat from the high-temperature partition zone to the natural cooling zone.

[0027] The object to be heated is transported from the rightmost position to the preheating zone via a conveyor 153 mounted on the conveyor belt assembly 20. The first movable door 30 opens, and the object is heated upon entering the high-temperature zone. The first movable door 30 then closes. Next, the second movable door 40 opens, and the object is conveyed to the high-temperature separation zone via the conveyor belt assembly 10. The second movable door 40 then closes. Because some of the heat transferred from the high-temperature zone when the first movable door 30 was opened exists in the high-temperature separation zone, its temperature is lower than that of the high-temperature zone but higher than that of the natural cooling zone (air). The remaining heat in the high-temperature separation zone is recovered to the high-temperature zone via a heat recovery device consisting of an exhaust fan 60 and a recovery pipe 61, achieving heat recovery and reuse, thus improving thermal energy efficiency and achieving energy conservation.

[0028] After the heated object enters the high-temperature dividing zone from the high-temperature zone, it then enters the natural cooling zone, where it slowly transitions from the high-temperature environment to the atmospheric temperature. This avoids the deformation of the heated object's shape and the defect of not being fully vitrified that would occur if it directly enters the natural cooling zone (atmosphere) from the high-temperature zone.

[0029] Meanwhile, since the temperature controller (not shown) and power controller (not shown) control the flame temperature and flame power of the flame-spraying device, the heated object will not be overheated or underheated.

[0030] The inner layer consists of a high-temperature reflective material and a fire-resistant material layer, the middle layer is a heat-insulating material layer, and the outer layer is an infrared reflective layer.

[0031] refer to Figure 3 In some embodiments, the furnace body 20 comprises three layers: an inner refractory material layer 21, a middle insulating material layer 22, and an outer infrared reflective layer (not shown). The refractory material layer 21 can be made of common refractory materials, such as alumina. Alternatively, the refractory material can be selected from high-alumina raw materials, silica raw materials, aluminosilicate raw materials, or magnesia refractory materials. The insulating material layer 22 can be selected from one of the following: asbestos, glass fiber, rock wool, silicates, expanded perlite, polystyrene foam, and polyurethane foam.

[0032] In some embodiments, both the first movable door 30 and the second movable door 40 are double doors opening to the left and right. A first belt 31 is connected to the bottom end of the first movable door 30, and the first belt 31 is sleeved on the first motor 32. A second belt 41 is connected to the bottom end of the second movable door 40, and the second belt 41 is sleeved on the second motor 42. When the first motor 32 is started, the first belt 31 drives the first movable door 30 to close or open; when the second motor 42 is started, the second belt 41 drives the second movable door 40 to close or open.

[0033] refer to Figure 2 In some embodiments, the conveyor belt assembly 10 includes a base frame 11 made of a row of square tubes welded together, a plurality of foot cups 12 connected to the lower end of the base frame, and a plurality of movable blocks 13 connected to the upper end of the base frame; the plurality of movable blocks 13 are arranged in a row, and a heat insulation material layer 22 is provided on the upper end surface of the plurality of movable blocks 13, and a refractory material layer 23 is provided on the upper end surface of the heat insulation material layer; a front drive device 15 and a rear drive device 16 are respectively provided on both sides of the base frame 11 along the long side, and the front drive device and the rear drive device are used to drive the plurality of movable blocks to move so that the object to be heated is conveyed from the preheating zone to the natural cooling zone on the refractory material layer 23.

[0034] refer to Figure 5 In some embodiments, the front drive unit 15 includes a third motor 151 and a third belt 152 mounted on the third motor. (See reference...) Figure 4 The rear drive unit 16 includes a fourth motor 161 and a fourth belt 162 mounted on the fourth motor. The third motor 151 drives the third belt 152 to move back and forth, and the fourth motor 161 drives the fourth belt 162 to move back and forth. The third belt 152 and the fourth belt 162 drive several movable blocks 13 to move to the left, so that the heated object passes through the preheating zone, the high temperature zone, the high temperature dividing zone, and the natural cooling zone in sequence.

[0035] In some embodiments, the tunnel furnace is also connected to an electrical control cabinet (not shown), which is equipped with a three-color lamp, phase sequence protector, leakage protection switch, grounding protection, emergency stop switch, etc., to ensure the safe operation of the tunnel furnace.

[0036] In some embodiments, the tunnel furnace is also connected to an intelligent control cabinet, which is used for precise control and real-time monitoring of the tunnel furnace temperature, thereby realizing intelligent control and management of the tunnel furnace.

[0037] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tunnel furnace, characterized in that, include: Track, and transmission components mounted on the track. The conveyor mounted on the transmission assembly, and the furnace body inverted on the transmission assembly, the inverted area of ​​the furnace body is divided into a preheating zone, a high temperature zone, a high temperature dividing zone and a cooling zone along the length of the track; The conveyor, powered by the transmission components, carries the heated material along the track into the preheating zone, high-temperature zone, high-temperature dividing zone, and cooling zone in sequence. A first movable door that can be opened and closed to block heat transfer is installed between the high-temperature zone and the high-temperature dividing zone, and a second movable door that can be opened and closed to block heat transfer is installed between the high-temperature dividing zone and the cooling zone. Several sets of flame-spraying devices are installed in the high-temperature zone. A heat recovery device connected to the high-temperature zone is installed at the upper end of the high-temperature dividing zone. Several sets of flame-spraying devices heat the high-temperature zone, and a portion of the heat energy flows to the preheating zone. The first and second movable doors are closed, and the object to be heated enters from the preheating zone. After being preheated by the conveying mechanism, the object is then conveyed to the high-temperature zone for heating. The first movable door opens, and the object is then conveyed to the high-temperature dividing zone. The second movable door opens, and the first movable door closes. After being cooled in the high-temperature dividing zone, the heated object enters the natural cooling zone. A portion of the heat transferred from the high-temperature zone to the high-temperature dividing zone is returned to the high-temperature zone by the heat recovery device.

2. The tunnel furnace as described in claim 1, characterized in that, The furnace body is U-shaped and consists of three layers from the inside out: the inner layer is a high-temperature reflective material and a refractory material layer, the middle layer is a heat insulation material layer, and the outer layer is an infrared reflective layer.

3. The tunnel furnace as described in claim 2, characterized in that, The refractory material is refractory brick or mullite brick; the heat insulation material is high-alumina cotton or aerogel.

4. The tunnel furnace as described in claim 1, characterized in that, The tunnel furnace is also connected to an electrical control cabinet.

5. The tunnel furnace as described in claim 1, characterized in that, The tunnel furnace is also connected to an intelligent control cabinet and software.

6. The tunnel furnace as described in claim 1, characterized in that, The heat recovery device includes an exhaust fan and a recovery pipe connected together.

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