Heat treatment furnace for micro-channel aluminum flat tube production

Abstract

The utility model relates to the technical field of micro-channel aluminum flat tube production, and discloses a heat treatment furnace for micro-channel aluminum flat tube production, which comprises a support, an annealing furnace main body fixed at the top of the support and a motor, the output end of the motor is in transmission connection with a feeding part, and the inner side of the feeding part is in transmission connection with a cleaning assembly; the feeding part is assembled to drive the aluminum flat pipe blank to move by utilizing the power of a motor; the cleaning assembly is arranged on the heat treatment line to conduct chemical cleaning on the surface of the aluminum flat pipe blank, the cleaning cloth is driven by power of a motor to move in the direction opposite to the moving direction of the aluminum flat pipe blank to wipe the surface of the aluminum flat pipe blank, and meanwhile, compounds generated by chemical cleaning through a cleaning agent are accumulated; according to the aluminum flat pipe blank cleaning device, the aluminum flat pipe blank is cleaned in three steps through the cleaning assembly, uneven temperature or material performance defects caused by local pollution during heat treatment are avoided, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of microchannel aluminum flat tube production technology, specifically a heat treatment furnace for microchannel aluminum flat tube production. Background Technology

[0002] The heat treatment furnace for microchannel aluminum flat tube production is a core piece of equipment, playing a crucial role in key aspects such as material performance optimization, processing defect control, and subsequent processing adaptation. First, through precisely temperature-controlled annealing or solution treatment (480-550℃), residual stress generated during hot extrusion of the aluminum flat tube is eliminated, preventing deformation during subsequent processing. Simultaneously, the grain structure is refined to improve the material's ductility and mechanical properties (e.g., the hardness of 6061-T6 alloy can reach HB95 or higher). Second, the heat treatment furnace integrates an inert gas (nitrogen / argon) protection system to prevent high-temperature oxidation of the aluminum material. A rapid cooling process (≥100℃ / min) suppresses the precipitation of coarse second phases from supersaturated solid solutions, ensuring the dimensional stability (tolerance ≤ ±0.03mm) of the microchannel thin-walled structure (wall thickness ≤0.13mm). In addition, the heat treatment furnace, as a pre-processing step before surface treatment, activates the surface of the aluminum tube through pre-cleaning and temperature homogenization treatment (preheating at 300-400℃), providing a high-adhesion substrate for the zinc spray anti-corrosion layer, meeting the requirements for salt spray corrosion resistance (such as 3A12 alloy) and burst pressure (>30MPa). Modern equipment adopts a continuous roller hearth furnace design, which is linked with the extruder and zinc spraying equipment through a PLC system to achieve fully automated production. This eliminates the risk of manual intervention while improving efficiency (annual capacity can reach 30,000 tons), and integrates electromagnetic induction heating and waste gas recovery technology to reduce energy consumption by more than 30%.

[0003] Existing heat treatment furnaces for microchannel aluminum flat tube production have significant limitations in surface impurity treatment. Because aluminum flat tubes are produced using a continuous extrusion-heat treatment integrated process, current mainstream equipment generally lacks integrated online cleaning components. This makes it difficult to effectively address the issues of surface grease, oxides, and extrusion lubricant residues. First, the pretreatment stage relies on offline chemical cleaning, requiring manual material transfer during production line interruption, which conflicts with the automated production mode of continuous annealing furnaces. During manual online cleaning, operators must come into contact with high-temperature aluminum tubes (300-500℃) and corrosive cleaning agents (such as phosphoric acid-nitric acid mixtures), posing a risk of burns and chemical burns. Second, offline cleaning results in a capacity loss of approximately 15%-20%, and secondary loading into the furnace can easily cause scratches or deformation on the aluminum tube surface (especially noticeable in thin-walled tubes with a wall thickness ≤0.13mm). Furthermore, residual lubricant volatilizes at high temperatures within the heat treatment furnace, potentially generating VOC emissions, while the waste liquid (containing heavy metal ions) generated from offline cleaning requires additional treatment. Utility Model Content

[0004] The purpose of this invention is to provide a heat treatment furnace for the production of microchannel aluminum flat tubes, which can effectively solve the technical problem of difficulty in cleaning surface grease, oxides and extrusion lubricant residues online.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heat treatment furnace for producing microchannel aluminum flat tubes, comprising a support, an annealing furnace body fixed to the top of the support, and a motor. The output end of the motor is driven by a feeding component, and the inner side of the feeding component is driven by a cleaning component. The feeding component is assembled to move the aluminum flat tube blank using the power of the motor. The cleaning component is set on the heat treatment line to chemically clean the surface of the aluminum flat tube blank. It uses the power of the motor to drive a cleaning cloth to move in the opposite direction to the movement of the aluminum flat tube blank to wipe the surface of the aluminum flat tube blank. At the same time, the compounds generated by the chemical cleaning with the cleaning agent are removed from the surface of the aluminum flat tube blank by a spray nozzle that rinses the impurities on the surface of the aluminum flat tube blank.

[0006] Furthermore, the motor is fixed to the inside of the bracket, a heat dissipation device is fixed to the top of one end of the bracket, the annealing furnace body is fixed to the top of the bracket, a preheating device is fixed to the top of the bracket, the annealing furnace body is located on the side close to the preheating device and the heat dissipation device, and the inner sides of the annealing furnace body, the preheating device and the heat dissipation device are connected.

[0007] Furthermore, the feeding component includes two support plates, which are fixed to the inside of the brackets. Multiple sets of transmission rollers are rotatably connected to the inside of the two brackets, with two transmission rollers forming a set. The aluminum flat tube blank is located on the side of each set of transmission rollers that is close to each other.

[0008] Furthermore, a large gear is fixed to one end of each transmission roller, and two large gears fixedly connected to the same set of transmission rollers mesh together, with each pair of transmission rollers connected by a transmission component.

[0009] Furthermore, the cleaning assembly includes two pinions and two drive shafts. The two drive shafts are rotatably connected to the inner sides of two support plates. The two pinions are respectively fixedly connected to one end of the two drive shafts near the large gear. The pinion located at the top of the aluminum flat tube blank meshes with the large gear located at the top of the aluminum flat tube blank, and the two pinions mesh.

[0010] Furthermore, the cleaning assembly also includes two cleaning cloths, and two driven shafts are rotatably connected to the inner sides of the two support plates. The two cleaning cloths are respectively fitted onto the outer sides of the driving shaft and the driven shaft located on the same plane.

[0011] Furthermore, the cleaning assembly also includes a water pipe and a cleaning pipe. The water pipe is fixedly connected to the inner side of the two support plates, the nozzle is fixedly connected to the bottom of the water pipe, the cleaning pipe is fixedly connected to the inner side of the two support plates, and the atomizing nozzle is fixedly connected to one side of the cleaning pipe. The spraying direction of the atomizing nozzle forms a 45-degree angle with the surface of the aluminum flat tube blank.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model integrates the cleaning component into the heat treatment line for aluminum flat tube production. It can not only perform three-step cleaning on the aluminum flat tube blank to ensure that the surface of the aluminum flat tube blank is clean and remove impurities such as surface grease and oxides, but also avoid uneven temperature or material performance defects caused by local contamination during heat treatment, thereby improving product quality. At the same time, the cleaning component can also be linked with the extruder and annealing furnace, so that the aluminum flat tube can complete the entire process of cleaning-heat treatment without interruption, thereby improving production efficiency.

[0014] 2. In this utility model, when the aluminum flat tube blank enters the inner side of two cleaning cloths, the two cleaning cloths wipe away the dirt, cleaning agent compounds, squeezed residual lubricant, and water stains on the surface of the aluminum flat tube blank. By moving in the opposite direction to the moving direction of the aluminum flat tube blank, the dirt, cleaning agent compounds, squeezed residual lubricant, and water stains on the surface of the aluminum flat tube blank are squeezed to the side close to the water pipe. The water sprayed from the water pipe and nozzle is used to rinse the surface of the aluminum flat tube blank, thus completing the cleaning of the dirt on the surface of the aluminum flat tube blank. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the feeding component of this utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A;

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

[0019] Figure 5 This is a schematic diagram of the cleaning component structure of this utility model.

[0020] In the diagram: 1. Support frame; 2. Feeding component; 22. Support plate; 23. Drive roller; 24. Transmission component; 25. Large gear; 3. Preheating device; 4. Annealing furnace body; 5. Heat dissipation device; 6. Cleaning component; 61. Small gear; 62. Drive shaft; 63. Driven shaft; 64. Cleaning cloth; 65. Water pipe; 66. Cleaning pipe; 67. Nozzle; 68. Atomizing nozzle; 7. Aluminum flat tube blank; 8. Motor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 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, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1 - Figure 5 A heat treatment furnace for producing microchannel aluminum flat tubes includes a support 1, an annealing furnace main body 4 fixed to the top of the support 1, and a motor 8. The output end of the motor 8 is connected to a feeding component 2, and the inner side of the feeding component 2 is connected to a cleaning component 6. The feeding component 2 is assembled to move an aluminum flat tube blank 7 using the power of the motor 8. The cleaning component 6 is located on the heat treatment line to chemically clean the surface of the aluminum flat tube blank 7. It uses the power of the motor 8 to move a cleaning cloth 64 in the opposite direction to the movement of the aluminum flat tube blank 7. The surface of material 7 is wiped, and the compounds generated by chemical cleaning using cleaning agents are removed from the surface of aluminum flat tube blank 7 by spray nozzle 67 which washes away impurities. Motor 8 is fixed to the inside of bracket 1. A heat dissipation device 5 is fixed to the top of one end of bracket 1. Annealing furnace body 4 is fixed to the top of bracket 1. Preheating device 3 is fixed to the top of bracket 1. Annealing furnace body 4 is located on the side close to preheating device 3 and heat dissipation device 5, and the inner sides of annealing furnace body 4, preheating device 3 and heat dissipation device 5 are connected.

[0025] In this embodiment, the aluminum flat tube billet 7 enters the preheating device 3 for preheating. Before entering the continuous annealing furnace body 4, the heater (such as infrared heating lamps or heating plates) preheats the aluminum flat tube billet 7 to 300-400℃ to eliminate some residual stress after extrusion molding, avoid heat treatment deformation, and ensure uniform heating of the material by zoned temperature control (temperature difference ≤ ±5℃). Then, it enters the annealing furnace body 4 for annealing (the annealing furnace body 4 is usually a continuous roller hearth furnace or a multi-temperature zone tunnel furnace, which eliminates residual stress after extrusion molding of aluminum flat tube billet 7 by precise temperature control heating at 480-550℃ and gradient cooling process, and can also be linked with the extruder and cooling device through PLC system to realize fully automated production). Finally, it enters the heat dissipation device 5 for air cooling.

[0026] Specifically, the feeding component 2 includes two support plates 22, which are fixed to the inner side of the bracket 1. Multiple sets of transmission rollers 23 are rotatably connected to the inner side of the two brackets 1, and the two transmission rollers 23 form a group. The aluminum flat tube blank 7 is located on the side close to each group of transmission rollers 23. A large gear 25 is fixed at one end of each transmission roller 23, and the two large gears 25 fixedly connected to the same group of transmission rollers 23 mesh. Every two groups of transmission rollers 23 are connected by transmission component 24.

[0027] In this embodiment, the transmission component 24 can be two gears and a toothed chain, or two belts and pulleys, or other structures capable of transmission. After the aluminum flat tube billet 7 is output from the extruder, it enters the feeding component 2. The operator starts the motor 8. The output end of the motor 8 transmits power to the transmission roller 23 connected to the output end of the motor 8 through two pulleys and a belt. The transmission rollers 23 in the same group rotate in opposite directions through the meshing action of two large gears 25. Under the action of multiple sets of transmission rollers 23, the aluminum flat tube billet 7 moves towards the side closer to the preheating device 3.

[0028] Specifically, the cleaning assembly 6 includes two pinions 61 and two drive shafts 62. The two drive shafts 62 are rotatably connected to the inner sides of two support plates 22. The two pinions 61 are respectively fixedly connected to one end of the two drive shafts 62 near the large gear 25. The pinion 61 located at the top of the aluminum flat tube blank 7 meshes with the large gear 25 located at the top of the aluminum flat tube blank 7. The cleaning assembly 6 also includes two cleaning cloths 64, and the inner sides of the two support plates 22 are rotatably connected to... Two driven shafts 63 and two cleaning cloths 64 are respectively fitted on the outside of the driving shaft 62 and driven shaft 63 located on the same plane. The cleaning assembly 6 also includes a water pipe 65 and a cleaning pipe 66. The water pipe 65 is fixedly connected to the inside of the two support plates 22. The nozzle 67 is fixedly connected to the bottom of the water pipe 65. The cleaning pipe 66 is fixedly connected to the inside of the two support plates 22. The atomizing nozzle 68 is fixedly connected to one side of the cleaning pipe 66. The spray direction of the atomizing nozzle 68 forms a 45-degree angle with the surface of the aluminum flat tube blank 7.

[0029] In this embodiment, the staff places the wastewater recycling equipment at the bottom of the cleaning component 6 according to the actual working conditions to recycle and treat the wastewater. Then, a pre-prepared cleaning agent (a mixture of cold-removing agent, alkaline degreasing agent, etc., with added stabilizers to prevent stratification or sedimentation) is connected to the input end of the cleaning pipe 66 via a water pump and pipeline. A water source is also connected to the input end of the cleaning pipe 66 via a water pump, preparing for subsequent cleaning work. Multiple sets of atomizing nozzles 68 and spray heads 67 are provided. When the aluminum flat tube blank 7 moves to the inside of the cleaning pipe 66, the cleaning agent, under pressure, passes through the inside of the cleaning pipe 66 and is sprayed from the atomizing nozzles 68 onto the top and bottom of the aluminum flat tube blank 7. The cleaning agent chemically reacts with the dirt (surface grease, wax deposits) on the top and bottom of the aluminum flat tube blank 7, removing the dirt. When the dirt, cleaning agent compounds, and aluminum flat tube blank 7 move to the water pipe 65, water is sprayed under pressure through the water pipe 65 and nozzle 67 onto the top and bottom of the aluminum flat tube blank 7, rinsing the dirt, cleaning agent compounds, and residual lubricant on the surface of the aluminum flat tube blank 7. Then, the aluminum flat tube blank 7 enters the inside of two cleaning cloths 64. The two cleaning cloths 64 wipe the dirt, cleaning agent compounds, residual lubricant, and water stains remaining on the surface of the aluminum flat tube blank 7, and squeeze the dirt, cleaning agent compounds, residual lubricant, and water stains on the surface of the aluminum flat tube blank 7 to the side close to the water pipe 65. The water sprayed out through the water pipe 65 and nozzle 67 completes the cleaning of the dirt on the surface of the aluminum flat tube blank 7. Then, the aluminum flat tube blank 7 enters the preheating device 3 for preheating.

[0030] Working principle: Before using the device, check whether there are any problems that may affect its use. According to the actual working conditions, the staff will connect the pre-prepared cleaning agent to the input end of the cleaning pipe 66 through the water pump and pipeline, and then connect the water source to the input end of the cleaning pipe 66 through the water pump. After the aluminum flat tube billet 7 is output from the extruder, it enters the feeding part 2. The staff starts the motor 8. Under the action of multiple sets of transmission rollers 23, the aluminum flat tube billet 7 moves to the side closer to the preheating device 3, so that the aluminum flat tube billet 7 enters the preheating device 3 for preheating, then enters the annealing furnace body 4 for annealing, and finally enters the heat dissipation device 5 for air cooling.

[0031] When the aluminum flat tube blank 7 moves to the inside of the cleaning pipe 66, the cleaning agent is sprayed from the atomizing nozzle 68 onto the top and bottom of the aluminum flat tube blank 7. The cleaning agent reacts chemically with the dirt on the top and bottom of the aluminum flat tube blank 7. When the dirt and cleaning agent compound, along with the aluminum flat tube blank 7, moves to the water pipe 65, water is sprayed from the water pipe 65 and the nozzle 67 onto the top and bottom of the aluminum flat tube blank 7 to rinse the surface of the aluminum flat tube blank 7. After that, the aluminum flat tube blank 7 enters the inside of the two cleaning cloths 64 to complete the cleaning of the dirt on the surface of the aluminum flat tube blank 7. Then, the aluminum flat tube blank 7 enters the preheating device 3 for preheating.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A heat treatment furnace for producing microchannel aluminum flat tubes, comprising a support (1), an annealing furnace body (4) fixed to the top of the support (1), and a motor (8), characterized in that: The output end of the motor (8) is connected to the feeding component (2), and the inner side of the feeding component (2) is connected to the cleaning component (6). The feeding component (2) is assembled to move the aluminum flat tube blank (7) by using the power of the motor (8); The cleaning component (6) is installed on the heat treatment line to chemically clean the surface of the aluminum flat tube blank (7). It uses the power of the motor (8) to drive the cleaning cloth (64) to move in the opposite direction to the movement of the aluminum flat tube blank (7) to wipe the surface of the aluminum flat tube blank (7). At the same time, the compound generated by the chemical cleaning using the cleaning agent is removed from the surface of the aluminum flat tube blank (7) by the spray nozzle (67) that washes away the impurities on the surface of the aluminum flat tube blank (7).

2. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 1, characterized in that: The motor (8) is fixed to the inside of the bracket (1). A heat dissipation device (5) is fixed to the top of one end of the bracket (1). A preheating device (3) is fixed to the top of the bracket (1). The annealing furnace body (4) is located on the side close to the preheating device (3) and the heat dissipation device (5). The inner sides of the annealing furnace body (4), the preheating device (3) and the heat dissipation device (5) are connected.

3. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 2, characterized in that: The feeding component (2) includes two support plates (22), which are fixed to the inside of the bracket (1). Multiple sets of transmission rollers (23) are rotatably connected to the inside of the two brackets (1), and the two transmission rollers (23) form a group. The aluminum flat tube blank (7) is located on the side close to each set of transmission rollers (23).

4. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 3, characterized in that: Each of the transmission rollers (23) has a large gear (25) fixed at one end, and the two large gears (25) fixedly connected to the same group of transmission rollers (23) mesh with each other. Every two groups of transmission rollers (23) are connected by transmission components (24).

5. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 4, characterized in that: The cleaning component (6) includes two pinions (61) and two drive shafts (62). The two drive shafts (62) are rotatably connected to the inner side of two support plates (22). The two pinions (61) are respectively fixedly connected to one end of the two drive shafts (62) near the large gear (25). The pinion (61) located at the top of the aluminum flat tube blank (7) meshes with the large gear (25) located at the top of the aluminum flat tube blank (7), and the two pinions (61) mesh.

6. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 5, characterized in that: The cleaning assembly (6) also includes two cleaning cloths (64), and two driven shafts (63) are rotatably connected to the inner sides of the two support plates (22). The two cleaning cloths (64) are respectively fitted onto the outer sides of the drive shaft (62) and the driven shaft (63) located on the same plane.

7. The heat treatment furnace for producing microchannel aluminum flat tubes according to claim 6, characterized in that: The cleaning assembly (6) also includes a water pipe (65) and a cleaning pipe (66). The water pipe (65) is fixedly connected to the inside of the two support plates (22). The nozzle (67) is fixedly connected to the bottom of the water pipe (65). The cleaning pipe (66) is fixedly connected to the inside of the two support plates (22). The atomizing nozzle (68) is fixedly connected to one side of the cleaning pipe (66). The spraying direction of the atomizing nozzle (68) is at an angle of 45 degrees to the surface of the aluminum flat tube blank (7).

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