A heat treatment mesh belt tempering furnace

Abstract

The utility model discloses a heat treatment net belt annealing furnace, including annealing furnace, the net belt transmission device for transmission workpiece of being worn in the annealing furnace, set up in the natural gas combustion device of annealing furnace to and set up in the steam generating device of annealing furnace, natural gas combustion device and steam generating device all with net belt transmission device each other corresponds. The heat treatment net belt annealing furnace workpiece can improve the rust -resistant capacity of product in the annealing production process.

Description

Technical Field

[0001] This application relates to the technical field of tempering furnace equipment, and more specifically, to a heat treatment mesh belt tempering furnace. Background Technology

[0002] Tempering is essential for steel workpieces after quenching, a crucial step to ensure their usability. Quenching creates martensite within the workpiece, resulting in high hardness but also severe brittleness and significant internal stress. This makes the workpiece prone to fracture upon impact and susceptible to cracking and deformation during storage or processing. Tempering at 160-550℃ causes the martensite to decompose into tempered martensite, troostite, or sorbite, balancing hardness and toughness as needed while releasing 60%-80% of internal stress, thus stabilizing the workpiece's microstructure and dimensions.

[0003] However, traditional tempering is mostly carried out in air or nitrogen-based protective atmospheres. This temperature range is precisely the active oxidation period of ordinary carbon steel, and a mixed Fe2O3 / FeO oxide scale is easily formed on the surface. This oxide scale has a loose structure and poor adhesion, and cannot isolate external corrosion. Instead, it will accumulate moisture and impurities through the pores, becoming a "rust source" that induces rust. At the same time, it will also reduce the dimensional accuracy of the workpiece and worsen the surface roughness.

[0004] To prevent rust, companies need to add extra processes such as shot blasting, pickling, phosphating, or oiling. Shot blasting requires the investment of equipment and steel shot consumables, pickling consumes acid and requires the treatment of acidic wastewater, and phosphating and oiling also require special agents and subsequent degreasing steps. These processes not only extend the production cycle but also increase equipment depreciation, labor, and environmental costs.

[0005] Therefore, those skilled in the art need to improve existing tempering furnaces to solve the aforementioned technical problems. Utility Model Content

[0006] The main objective of this application is to provide a heat treatment mesh belt tempering furnace that can improve the rust resistance of products during the tempering process.

[0007] To achieve the above objectives, in a first aspect, this application provides a heat treatment mesh belt tempering furnace, including a tempering furnace, a mesh belt conveyor device disposed in the tempering furnace for conveying workpieces, a natural gas combustion device disposed in the tempering furnace, and a steam generating device disposed in the tempering furnace, wherein the natural gas combustion device and the steam generating device are respectively corresponding to the mesh belt conveyor device.

[0008] Optionally, the steam generator is located on the feed inlet side of the tempering furnace, and the natural gas combustion device is located on the discharge outlet side of the tempering furnace.

[0009] Optionally, the steam generating device includes a steam pipeline for transporting water and a steam nozzle disposed on the steam pipeline.

[0010] Optionally, the natural gas combustion device includes a natural gas pipeline for transmitting natural gas, a natural gas outlet valve disposed on the natural gas pipeline, and an ignition device disposed at one end of the natural gas outlet valve.

[0011] Optionally, there are multiple steam nozzles and multiple natural gas outlet valves.

[0012] Optionally, the tempering furnace includes a tempering furnace body, a furnace chamber disposed within the tempering furnace body, a reflux channel disposed on the side wall of the tempering furnace body, an air inlet and an air outlet disposed at both ends of the reflux channel, and an air intake fan disposed on one side of the air inlet, the air intake fan being housed within the reflux channel.

[0013] Optionally, the air inlet is located at the junction of the steam generator and the natural gas combustion device, and the air outlet is located on the side of the tempering furnace body near the natural gas combustion device.

[0014] Optionally, the heat treatment mesh belt tempering furnace further includes a temperature sensor disposed inside the tempering furnace, and a control device connected to the temperature sensor and the natural gas combustion device.

[0015] Optionally, there are multiple temperature sensors, which are arranged at equal intervals inside the tempering furnace.

[0016] The present invention provides a heat treatment mesh belt tempering furnace, which has the following advantages compared with the prior art: Firstly, the heat treatment mesh belt tempering furnace is equipped with a natural gas combustion device and a steam generation device. During the processing of the workpiece in the tempering furnace, the steam generation device sprays water vapor on the surface of the workpiece, and the natural gas combustion device heats the workpiece, thereby causing an oxidation reaction on the surface of the workpiece to form iron tetroxide, thus improving the rust prevention effect of the product.

[0017] Secondly, the reflux channel in the tempering furnace is located inside the side wall of the main body of the tempering furnace. One end of the reflux channel is the air inlet, and the other end is the air outlet. The air inlet and the air outlet connect the reflux channel to the furnace chamber. The air inlet is located at the junction of the steam generator and the natural gas combustion device. The air outlet transmits air to one side of the natural gas combustion device. The natural gas combustion device itself is the core area that continuously generates high temperatures. It not only provides sufficient temperature for the complete combustion of natural gas and carbon monoxide, but also continuously introduces air into this area during combustion, providing sufficient oxygen to ensure that incompletely burned natural gas and carbon monoxide are fully burned again here, thereby improving fuel utilization efficiency and reducing pollutant emissions. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 Yes: A schematic diagram of the tempering furnace with a heat treatment mesh belt; Figure 2 Yes: A schematic cross-sectional view of the tempering furnace with mesh belt in this heat treatment process; Figure 3 Yes: A cross-sectional structural schematic diagram of the tempering furnace with a mesh belt in this heat treatment process from another perspective; The components include: 1. Tempering furnace; 11. Tempering furnace body; 12. Furnace chamber; 13. Reflux channel; 14. Air inlet; 15. Air outlet; 16. Air inlet fan; 2. Mesh belt conveyor; 3. Natural gas combustion device; 31. Natural gas pipeline; 32. Natural gas outlet valve; 33. Ignition device; 4. Steam generator; 41. Water pipe; 42. Steam nozzle; 5. Temperature sensor. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain circumstances to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] In addition, the term "multiple" should mean two or more.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1-3 As shown, a heat treatment mesh belt tempering furnace includes a tempering furnace 1, a mesh belt conveyor 2 passing through the tempering furnace 1 for conveying workpieces, a natural gas combustion device 3 installed in the tempering furnace 1, a steam generator 4 installed in the tempering furnace 1, a temperature sensor 5 installed in the tempering furnace 1, and a control device (not shown) connected to the temperature sensor 5 and the natural gas combustion device 3.

[0026] The tempering furnace 1 includes a tempering furnace body 11, a furnace chamber 12 disposed within the tempering furnace body 11, a reflux channel 13 disposed on the side wall of the tempering furnace body 11, an air inlet 14 and an air outlet 15 disposed at both ends of the reflux channel 13, and an air intake fan 16 disposed on one side of the air inlet 14.

[0027] In this embodiment, the tempering furnace body 11 is a box-type tempering furnace. The tempering furnace body 11 is welded from high-temperature resistant steel plates. The inner wall of the furnace chamber 12 is lined with multiple layers of composite insulation material to reduce heat loss from the furnace. This reduces energy consumption and prevents the outer shell temperature of the tempering furnace body 11 from becoming too high, ensuring operational safety. The internal dimensions of the furnace chamber 12 are matched with the conveying width and workpiece stacking height of the mesh belt conveyor 2 to ensure sufficient thermal circulation space after the workpiece enters the furnace, avoiding uneven heating caused by local obstruction. The tempering furnace body 11 is a prior art and will not be described in detail here.

[0028] The furnace chamber 12 is the heating cavity inside the tempering furnace body 11. The workpiece is transferred to the furnace chamber 12 for tempering. The furnace chamber 12 is a prior art and will not be described in detail here.

[0029] The reflux channel 13 is located inside the side wall of the tempering furnace body 11. One end of the reflux channel 13 is the air inlet 14 and the other end is the air outlet 15. The air inlet 14 and the air outlet 15 connect the reflux channel 13 to the furnace chamber 12, and the reflux channel 13 realizes the air circulation in the furnace chamber 12.

[0030] The intake fan 16 is a negative pressure fan, and the intake fan 16 is housed in the return channel 13. The intake fan 16 is located at one end of the return channel 13 near the air inlet 14. The air inlet 14 is located at the junction of the steam generator 2 and the natural gas combustion device 3. Since the steam generator 2 and the natural gas combustion device 3 are in continuous contact with steam at the junction, and the cooling effect of the steam will make it difficult for the temperature in this area to maintain the critical temperature required for the complete combustion of natural gas, this junction will produce incompletely burned natural gas and incompletely burned intermediate product carbon monoxide.

[0031] The intake fan 16 draws unburned natural gas and carbon monoxide from the furnace 12 into the return channel 13 through the air inlet 14, and transmits them to the side of the natural gas combustion device 3 through the air outlet 15. The natural gas combustion device 3 itself is a core area that continuously generates high temperatures. It not only provides sufficient temperature for the complete combustion of natural gas and carbon monoxide, but also continuously introduces air into this area during the combustion process, providing sufficient oxygen to ensure that the unburned natural gas and carbon monoxide are completely burned again here, thereby improving fuel utilization efficiency and reducing pollutant emissions.

[0032] The mesh belt conveyor 2 is a mechanical device that continuously transports materials via a mesh belt. It is mainly used for material handling and production line automation. Its working principle is that the motor drives the reducer to rotate the active roller shaft. The active roller shaft and the driven roller shaft cooperate to tension the mesh belt, so that the mesh belt moves at a constant speed along a preset trajectory, thereby realizing continuous and stable material handling and avoiding the production line efficiency loss caused by intermittent conveying. The mesh belt is made of metal material to avoid damage to the mesh belt in high-temperature environments. The mesh belt conveyor 2 is a prior art and will not be described in detail here.

[0033] The natural gas combustion device 3 includes a natural gas pipeline 31, a natural gas outlet valve 32 installed on the natural gas pipeline 31, and an ignition device 33 installed at one end of the natural gas outlet valve 32.

[0034] The natural gas pipeline 31 is used to connect to the natural gas supply pipeline (not shown) to realize the transmission of natural gas and then supply gas to the natural gas outlet valve 32. The connection structure between the natural gas pipeline 31 and the supply pipeline (not shown) is a prior art and will not be described in detail here.

[0035] The natural gas outlet valve 32 is interconnected with the natural gas pipeline 31 to supply gas from the natural gas pipeline 31 to the natural gas outlet valve 32. The connection structure between the natural gas outlet valve 32 and the natural gas pipeline 31 is a prior art. The natural gas outlet valve 32 can adjust the gas output ratio of the natural gas outlet valve 32 through the signal of the control device (not shown). The control method between the natural gas outlet valve 32 and the control device (not shown) is a prior art and will not be described in detail here.

[0036] The ignition device 33 is used to ignite the natural gas at the outlet of the natural gas outlet valve 32, specifically by generating a high-voltage electric spark to contact the natural gas and trigger a combustion reaction. The ignition device 33 is a prior art, and common types include high-voltage ignition needles and pulse igniters. Its structure and working principle have been widely used in gas heating equipment, burners, and other scenarios, so it will not be described in detail here.

[0037] The steam generating device 4 includes a water pipe 41 for conveying water and a steam nozzle 42 disposed on the water pipe 41.

[0038] The water pipe 41, serving as a water delivery channel, is typically made of high-temperature resistant and corrosion-resistant metal. One end is connected to an external water source, and the other end is sealed to the steam nozzle 42. To ensure stable water delivery, the water pipe 41 is often equipped with auxiliary components such as a shut-off valve, a flow meter, and a miniature water pump. The shut-off valve is used to manually control the water flow, the flow meter monitors the water flow rate in real time to match the steam production demand, and the water pump provides stable water pressure to ensure that water is continuously and evenly delivered to the steam nozzle 42. The steam nozzle 42 is a key component for realizing the water-to-steam conversion. The steam nozzle 42 is a built-in heating nozzle, integrating an electric heating element. When water flows through the nozzle, it is directly heated to the boiling point, instantly converting into saturated steam or superheated steam. The resulting steam is then transported to the workpiece on the mesh belt conveyor 1. The water pipe 41 and the steam nozzle 42 are both existing technologies and will not be described in detail here.

[0039] During use, the steam generator 4 sprays steam onto the workpiece. The iron in the workpiece reacts with the water vapor at high temperature, resulting in an oxidation reaction that forms magnetite (Fe3O4) on the workpiece surface, improving its rust resistance. While iron reacts with water vapor to form magnetite, hydrogen is also generated. Hydrogen is a typical reducing gas, and the combustion products of natural gas, carbon dioxide and incompletely burned carbon monoxide, can react with hydrogen, inhibiting its reduction reaction and maintaining the stability of the magnetite on the workpiece surface. Specifically, during combustion, carbon monoxide and carbon dioxide are generated. Carbon dioxide consumes the byproduct hydrogen through a reverse water-gas reaction, while carbon monoxide adsorbs and decomposes on the film surface, achieving self-repair and oxygen replenishment. Furthermore, the water in the steam further replenishes the oxygen lattice of the magnetite and blocks oxygen vacancy diffusion. These three elements work together to maintain the oxygen-hydrogen partial pressure ratio, inhibiting the reduction of magnetite.

[0040] Multiple temperature sensors 5 are arranged at equal intervals inside the tempering furnace 1 to detect the temperature in different areas of the furnace 1. These temperatures are transmitted to the control device to obtain an average temperature, which is then compared with a set temperature. When the average temperature is lower than the set temperature, the control device increases the gas supply to the natural gas outlet valve 32, raising the temperature inside the tempering furnace 1. When the average temperature is higher than the set temperature, the control device decreases the gas supply to the natural gas outlet valve 32, lowering the temperature inside the tempering furnace 1. The control device is a PLC, and its method of adjusting the gas supply to the natural gas combustion device 3 based on the detected temperatures of the temperature sensors 5 does not involve any technical improvements and will not be elaborated upon here.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat treatment mesh belt tempering furnace, characterized in that: It includes a tempering furnace, a mesh belt conveyor installed in the tempering furnace for transporting workpieces, a natural gas combustion device installed in the tempering furnace, and a steam generator installed in the tempering furnace, wherein the natural gas combustion device and the steam generator are respectively corresponding to the mesh belt conveyor.

2. The heat treatment mesh belt tempering furnace as described in claim 1, characterized in that: The steam generator is located on the feed inlet side of the tempering furnace, and the natural gas combustion device is located on the discharge outlet side of the tempering furnace.

3. The heat treatment mesh belt tempering furnace as described in claim 1, characterized in that: The steam generating device includes a steam pipeline for transporting water and a steam nozzle disposed on the steam pipeline.

4. The heat treatment mesh belt tempering furnace as described in claim 3, characterized in that: The natural gas combustion device includes a natural gas pipeline for transmitting natural gas, a natural gas outlet valve installed on the natural gas pipeline, and an ignition device installed at one end of the natural gas outlet valve.

5. A heat treatment mesh belt tempering furnace as described in claim 4, characterized in that: There are multiple steam nozzles and multiple natural gas outlet valves.

6. The heat treatment mesh belt tempering furnace as described in claim 1, characterized in that: The tempering furnace includes a tempering furnace body, a furnace chamber disposed within the tempering furnace body, a reflux channel disposed on the side wall of the tempering furnace body, an air inlet and an air outlet disposed at both ends of the reflux channel, and an air intake fan disposed on one side of the air inlet, the air intake fan being housed within the reflux channel.

7. A heat treatment mesh belt tempering furnace as described in claim 6, characterized in that: The air inlet is located at the junction of the steam generator and the natural gas combustion device, and the air outlet is located on the side of the tempering furnace body near the natural gas combustion device.

8. The heat treatment mesh belt tempering furnace as described in claim 1, characterized in that: The heat treatment mesh belt tempering furnace also includes a temperature sensor installed inside the tempering furnace, and a control device connected to the temperature sensor and the natural gas combustion device.

9. A heat treatment mesh belt tempering furnace as described in claim 8, characterized in that: There are multiple temperature sensors, which are arranged at equal intervals inside the tempering furnace.

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