A rapid heating and cooling aluminum alloy annealing furnace

Abstract

This application relates to the field of heat treatment equipment, and particularly to a rapid heating and cooling aluminum alloy annealing furnace, which includes an annealing furnace body, a circulation pipeline and a cooling system. Both ends of the circulation pipeline are communicated with the inside of the annealing furnace body. The cooling system is installed on the circulation pipeline and is used for heat exchange with the gas in the circulation pipeline. A circulation fan for driving the gas flow in the circulation pipeline is also provided on the circulation pipeline. This application has the effect of reducing the comprehensive cost in the product treatment process.

Description

Technical Field

[0001] The present application relates to the technical field of heat treatment equipment, and particularly relates to a rapid heating and cooling aluminum alloy annealing furnace. Background Art

[0002] In the processing of metal materials, annealing treatment is an important process for eliminating residual stress inside the material, improving the mechanical properties and processing performance of the material.

[0003] During the cooling process of a conventional annealing furnace, heat dissipation inside the furnace is usually achieved by opening the furnace door, or by stopping heating to allow natural cooling. The natural cooling cycle is relatively long, which is not conducive to improving production efficiency. The utility model patent with the publication number CN201121202Y discloses a cooling device for a bell-type annealing furnace, which mainly sets multiple axial flow fans at the top of the furnace body to improve the gas exchange inside and outside the furnace.

[0004] In the related art, the annealing efficiency of the annealing furnace is improved through axial flow fans, but it is not applicable to the annealing process of some special products (products not convenient for contact with oxygen). This is mainly because nitrogen is mostly filled in the annealing furnace during the annealing process of special products. The above-mentioned annealing furnace cooling device discharges the nitrogen inside the furnace into the air, resulting in a large consumption of nitrogen and being not conducive to reducing production costs. Summary of the Invention

[0005] In order to reduce the cost during the annealing process of products, the present application provides a rapid heating and cooling aluminum alloy annealing furnace.

[0006] The rapid heating and cooling aluminum alloy annealing furnace provided by the present application adopts the following technical solutions:

[0007] A rapid heating and cooling aluminum alloy annealing furnace includes an annealing furnace body, a circulation pipeline, and a cooling system. Both ends of the circulation pipeline are communicated with the inside of the annealing furnace body. The cooling system is installed on the circulation pipeline and is used for heat exchange with the gas in the circulation pipeline. A circulation fan for driving the gas flow in the circulation pipeline is also provided on the circulation pipeline.

[0008] By adopting the above technical solutions, during the cooling process of the annealing furnace body, the circulation fan drives the gas in the annealing furnace body to flow into the circulation pipeline, and then the gas is cooled by the cooling system. Subsequently, the cooled gas enters the annealing furnace body again, and the cycle is repeated to achieve rapid cooling of the furnace body. At the same time, a closed circulation of the gas inside the annealing furnace body is realized, reducing the consumption of the gas inside the annealing furnace body and lowering the annealing cost of products.

[0009] Optionally, the cooling system includes a heat exchanger and a cooling water tower. The heat exchanger is connected to the circulation pipeline and is used for heat exchange with the gas inside the circulation pipeline. The cooling water tower is connected to the heat exchanger and is used for cooling the heat exchanger.

[0010] By adopting the above technical solution, heat exchange is carried out between the heat exchanger and the gas inside the circulation pipeline to cool the gas. Subsequently, the cooling water tower cools the heat exchanger, so that the heat exchanger can continuously cool the gas in the circulation pipeline.

[0011] Optionally, a mode control device is provided on the circulation pipeline. The mode control device includes a temperature detection component and a voltage control component. The circulation fan includes a housing, blades rotatably connected inside the housing, and a driving member fixed outside the housing for driving the blades to rotate. The change in the voltage at both ends of the driving member can cause a change in the rotation speed of the blades. The voltage control component is used to control the voltage at both ends of the driving member, and the temperature detection component is used to detect the temperature of the gas inside the circulation pipeline.

[0012] By adopting the above technical solution, during the gas circulation process in the annealing furnace body, the temperature in the circulation pipeline can reflect the temperature in the annealing furnace body. According to the temperature in the annealing furnace body, the rotation speed of the circulation fan is controlled to adjust the cooling rate in the annealing furnace body, and the cooling rate of the annealing furnace body is controlled according to different products and the temperature in the annealing furnace body, thereby improving the annealing effect of the products.

[0013] Optionally, the temperature detection component includes a detection ring, a thermal driving member, and a movable ring. The inside of the detection ring is hollow and is in communication with the inside of the circulation pipeline. The movable ring is slidably connected inside the detection ring. The thermal driving member is installed inside the detection ring and is connected to the movable ring. The thermal driving member can drive the movable ring to move when it absorbs heat.

[0014] By adopting the above technical solution, the thermal driving member drives the sliding ring to move as the temperature changes, and the temperature inside the circulation pipeline is judged by the stroke of the movable ring to realize the detection of the temperature of the gas inside the circulation pipeline.

[0015] Optionally, the temperature detection component further includes a driving ring. The driving ring is rotatably arranged in the detection ring. The movable ring is threadedly sleeved on the driving ring. The thermal driving member is connected to the driving ring and can drive the driving ring to rotate.

[0016] By adopting the above technical solution, the driving ring is driven to rotate by the thermal driving member, and then the movable ring is driven in cooperation with the thread. The self-locking property of the thread can improve the stability of the movable ring itself and make the force on the movable ring more uniform.

[0017] Optionally, the voltage control component includes a resistance rod and two electrical connection members made of conductive materials. The two electrical connection members are arranged at intervals on the resistance rod, and at least one of the electrical connection members can slide along the length direction of the resistance rod. The two electrical connection members are connected in series to the driving circuit of the driving member.

[0018] By adopting the above technical solution, two electrical connectors are connected in series in the circuit, and the resistance rod between the two electrical connectors is connected in series in the circuit. By adjusting the position between the two electrical connectors, the length of the resistance rod connected in series to the circuit can be changed, so as to control the voltage across the driving member.

[0019] Optionally, the length direction of the resistance rod is parallel to the sliding direction of the movable ring. The movable ring is connected to the electrical connector slidably connected to the resistance rod, and the movement of the movable ring can drive the electrical connector to move.

[0020] By adopting the above technical solution, by connecting the movable plate and the electrical connector, the circulation fan can react according to the temperature inside the annealing furnace body. In this connection mode, it can be shown that when the temperature inside the annealing furnace body is relatively high, the length of the resistance rod inserted into the driving circuit of the driving member is shorter. At this time, the voltage across the driving member is larger, so that the blade speed is higher and the cooling speed is faster. As the temperature continuously decreases, the cooling rate decreases gently, which is convenient for the staff to control the temperature change curve inside the annealing furnace body.

[0021] Optionally, the resistance rod can slide along the direction parallel to the sliding direction of the movable ring, and a timing module for driving the resistance rod to move at a constant speed is arranged on the circulation pipeline.

[0022] By adopting the above technical solution, during the actual annealing process, assuming that the rotation speeds of the two blades remain unchanged, the cooling rate inside the annealing furnace body remains unchanged. Through the moving resistance rod, the relative rest between the movable ring and the resistance rod can be achieved, so as to provide another cooling mode for the staff, that is, uniform cooling. The staff can control the operation of the timing module according to the actual product during the actual production process, and select different cooling modes, so as to broaden the application range of the annealing furnace body.

[0023] Optionally, the timing module includes a cylinder, a piston and a cover plate. The piston is slidably matched in the cylinder. The resistance rod is connected to the piston. The cover plate seals one end of the cylinder away from the resistance rod. An exhaust micropore is opened on the cover plate, and an elastic member for continuously applying a force to the piston is arranged on the cylinder.

[0024] By adopting the above technical solution, under the action of the elastic member, the piston maintains a tendency to move in one direction. At the same time, the exhaust micropores on the cover plate are used to control the flow rate of air entering or discharging from the air cylinder, providing damping for the movement of the piston, making the movement of the piston tend to be uniform, and realizing the uniform movement of the resistance rod. During the annealing process of the annealing furnace body, when selecting the mode of uniform temperature reduction, first slide the resistance rod to adjust the movement of the resistance rod to change the distance between the two electrical connectors, thereby realizing the manual intervention of the blade rotation speed. Subsequently, the reset member drives the piston to move, realizing the drive of the resistance rod. During this process, too fast or too slow temperature reduction will cause changes in the distance between the two electrical connectors, thereby automatically adjusting the rotation speed of the blade, so that the temperature in the annealing furnace can tend to change uniformly.

[0025] Optionally, the cover plate can slide in a direction parallel to the sliding direction of the piston, and a reset member for applying a force to the cover plate to make the cover plate approach the air cylinder is further provided on the air cylinder.

[0026] By adopting the above technical solution, during the process of manually sliding the piston, the piston approaches the cover plate, and under the action of the pressure in the air cylinder, it can overcome the elastic force of the elastic member, making the cover plate away from the air cylinder, so that the air in the air cylinder can be quickly discharged, facilitating the staff to quickly adjust the distance between the two electrical connectors. Brief Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the first embodiment of the present application.

[0028] Figure 2 is the structural schematic diagram of the temperature reduction device of the first embodiment of the present application.

[0029] Figure 3 is the overall structural schematic diagram of the mode control device of the second embodiment of the present application.

[0030] Figure 4 is the structural schematic diagram of the temperature detection component of the second embodiment of the present application at the first angle.

[0031] Figure 5 is the structural schematic diagram of the temperature detection component of the second embodiment of the present application at the second angle.

[0032] Figure 6 is the structural schematic diagram of the voltage control component of the second embodiment of the present application when the piston is away from the initial position.

[0033] Figure 7 is the structural schematic diagram of the voltage control component of the second embodiment of the present application when the piston is at the initial position.

[0034] Figure 8 is the structural schematic diagram of the cover plate of the second embodiment of the present application.

[0035] Reference numerals: 1, annealing furnace body; 2, temperature reduction device; 21, circulation pipeline; 211, air outlet pipe; 2111, main pipeline; 2112, branch pipeline; 212, air inlet pipe; 2121, primary pipeline; 2122, secondary pipeline; 22, cooling system; 221, heat exchanger; 222, cooling water tower; 23, circulation fan; 3, mode control device; 31, temperature detection component; 32, detection ring; 33, sliding cavity; 34, driving ring; 35, thermal driving member; 351, fixed end; 352, free end; 36, indicating rod; 37, movable ring; 4, voltage control component; 41, resistance rod; 42, electrical connection member; 421, movable electrode; 422, fixed electrode; 5, timing module; 51, air cylinder; 52, piston; 53, elastic member; 54, cover plate; 55, exhaust micropores; 56, protective cover; 57, large displacement air holes; 58, reset member; 6, valve. Detailed implementation manners

[0036] The following further elaborates on this application Figures 1-7 in conjunction with the attached drawings.

[0037] An embodiment of this application discloses a rapid heating and cooling aluminum alloy annealing furnace.

[0038] Referring to Figure 1 and Figure 2 , a rapid heating and cooling aluminum alloy annealing furnace includes an annealing furnace body 1 and a temperature reduction device 2. The temperature reduction device 2 includes a circulation pipeline 21 and a cooling system 22. The circulation pipeline 21 includes an air outlet pipe 211 and an air inlet pipe 212. Both the air outlet pipe 211 and the air inlet pipe 212 are in communication with the interior of the annealing furnace, and the air outlet pipe 211 and the air inlet pipe 212 are in communication with each other. The cooling system 22 is arranged between the air inlet pipe 212 and the air outlet pipe 211 and is used for cooling the gas flowing through the cooling system 22. A circulation fan 23 is arranged between the air outlet pipe 211 and the cooling system 22. The circulation fan 23 is used to promote the flow of air towards the cooling system 22. The gas cooled by the cooling system 22 re-enters the furnace body through the air inlet pipe 212, thereby realizing the closed circulation of the gas in the furnace, and rapidly cooling the interior of the furnace body by cooling the gas through the temperature reduction device 2.

[0039] Referring to Figure 1 and Figure 2, the cooling system 22 includes a heat exchanger 221 which is used to exchange heat between the air in the circulation pipe and the external environment. In this embodiment, the heat exchanger 221 is a shell and tube heat exchanger 221. One end of the air outlet pipe 211 far from the annealing furnace body 1 is communicated with the air inlet of the shell and tube heat exchanger 221, and one end of the air inlet pipe 212 far from the annealing furnace body 1 is communicated with the air outlet of the shell and tube heat exchanger 221. When the air in the circulation pipeline 21 flows through the shell and tube heat exchanger 221, it can exchange heat with the coolant in the shell of the shell and tube heat exchanger 221 to achieve the cooling of the gas.

[0040] Referring to Figure 1 and Figure 2 , the cooling system 22 further includes a cooling water tower 222 which is connected to the coolant outlet of the shell and tube heat exchanger 221 and is used to cool the coolant and inject the cooled coolant into the shell of the shell and tube heat exchanger 221 again.

[0041] Referring to Figure 1 and Figure 2 , the air outlet pipe 211 includes a main pipe 2111 and branch pipes 2112. The main pipe 2111 is arranged outside the annealing furnace body 1. A plurality of branch pipes 2112 are arranged along the length direction of the main pipe 2111 and are located above the annealing furnace body 1. One end of the branch pipe 2112 is communicated with the main pipe 2111, and the other end is inserted into the annealing furnace body 1 to achieve the communication between the inside of the annealing furnace body 1 and the main pipe 2111. At the same time, the arrangement of a plurality of branch pipes 2112 can improve the efficiency and uniformity of the discharge of high-temperature gas inside the annealing furnace body 1 and reduce the uneven temperature in the furnace.

[0042] Referring to Figure 1 and Figure 2 , the air inlet pipe 212 includes a primary pipe 2121 and a plurality of secondary pipes 2122. The primary pipe 2121 is connected to the air outlet of the shell and tube heat exchanger 221. The secondary pipes 2122 are arranged in two groups, and the two secondary pipes 2122 are respectively arranged at positions close to two mutually parallel inner side walls of the annealing furnace body 1 to facilitate the uniform injection of air into the furnace and reduce the temperature uniformity in the annealing furnace body 1 during the heating or cooling process.

[0043] The implementation principle of a rapid heating and cooling aluminum alloy annealing furnace in an embodiment of this application is as follows: The high-temperature gas in the annealing furnace body 1 is driven by the circulation fan 23 to enter the cooling system 22, and the gas cooled by the cooling system 22 enters the annealing furnace body 1 to actively cool the annealing furnace body 1. On the one hand, the cooling rate of the annealing furnace body 1 is increased. On the other hand, the gas in the annealing furnace body 1 is recycled, reducing the waste of gas in the furnace and lowering the annealing cost of the product.

[0044] Embodiment 2

[0045] Referring to Figure 3 and Figure 4 , the difference between this embodiment and Embodiment 1 is that in this application, a mode control device 3 for detecting the temperature of the annealing furnace body 1 and controlling the operation of the circulation fan 23 is provided on the air outlet pipe 211. In this application, the circulation fan 23 includes a housing and an impeller rotatably connected inside the housing, and an air inlet and an air outlet are provided on the housing. A driving member for driving the impeller to rotate is provided outside the housing. In this embodiment, the driving member is a DC motor, and its speed can be adjusted according to the voltage across its two ends.

[0046] Referring to Figure 4 and Figure 5 , the mode control device 3 includes a temperature detection component 31 and a voltage control component 4. The temperature detection component 31 is arranged inside the air outlet pipe 211 for detecting the temperature inside the annealing furnace body 1. The voltage control component 4 is used to control the voltage across the driving member, thereby controlling the rate of air circulation inside and outside the annealing furnace body 1, and further controlling the cooling rate of the annealing furnace body 1. In this embodiment, the annealing furnace body 1 does not need to cooperate with the cooling system 22 during use. Specifically, the circulation of the gas inside the annealing furnace body 1 is an open circulation, that is, in the form that a large amount of external cold air enters the annealing furnace body 1 as the air inside the annealing furnace body 1 is extracted. When the mode control device 3 in this embodiment is used in cooperation with the cooling system 22, it is necessary to ensure the cooling effect of the cooling system 22 on the gas in the circulation pipeline 21.

[0047] Referring to Figure 4 and Figure 5 , the temperature detection component 31 includes a detection ring 32. The detection ring 32 is of an annular structure. The main pipeline 2111 is divided into two parts along its own length, and the detection ring 32 is arranged between the two parts of the main pipeline 2111. The two end faces of the detection ring 32 are welded to the two parts of the detection ring 32 respectively. The inner side wall of the detection ring 32 is flush with the inner side wall of the main pipeline 2111 to form a complete channel for gas to pass through. The inside of the detection ring 32 is hollow to form an annular sliding cavity 33. An activity ring 37 is slidably arranged in the sliding cavity 33 along a direction parallel to its own length. The outer side wall of the activity ring 37 is attached to the side wall of the sliding cavity 33 parallel to its own length. To realize the sliding connection of the activity ring 37 in the direction parallel to the length of the detection ring 32.

[0048] Referring to Figure 4 and Figure 5, the temperature detection component 31 further includes a driving ring 34, and the driving ring 34 is of a cylindrical structure. In this embodiment, the detection ring 32 is of an annular structure, and the driving ring 34 is correspondingly arranged as an annular structure. The driving ring 34 is coaxially arranged in the sliding cavity 33, the inner side wall of the driving ring 34 is attached to the inner side wall of the driving cavity, and the driving ring 34 can rotate around its own axis. Thread grooves are formed on the outer side wall of the driving ring 34, and the movable ring 37 is threadedly sleeved on the driving ring 34. Rotating the driving ring 34 can drive the movable ring 37 to move.

[0049] Referring to Figure 4 and Figure 5 , the thermal drive 35 is used to drive the driving ring 34 to rotate. In this embodiment, the thermal drive 35 is a bimetallic strip. The bimetallic strip is in a scroll-like structure at room temperature (25°C - 30°C). Define the two ends of the bimetallic strip as the fixed end 351 and the free end 352 respectively. In this embodiment, the fixed end 351 is the end of the bimetallic strip away from the inside of the main pipe 2111, and it is welded to the side wall of the accommodating cavity, and the other end is welded to the driving ring 34. The bimetallic strip is formed by compounding two materials with different coefficients of thermal expansion. When the ambient temperature it is in changes, it can deform, enabling its free end 352 to drive the driving ring 34 to rotate, and further driving the movable ring 37 to move. The position of the movable ring 37 can reflect the high or low temperature inside the annealing furnace body 1.

[0050] Referring to Figure 4 and Figure 5 , in this embodiment, the temperature range of the annealing furnace body 1 is 0°C - 500°C. Define the number of turns of the trajectory coil of the bimetallic strip at room temperature as X, and the number of turns that the free end 352 rotates relative to the fixed end 351 within the temperature change range of 0°C - 500°C as Y. So that during the temperature change process, the relationship between the rotation angle of the free end 352 and the temperature change tends to be linearly changed. Y ≤ 1 / 10X, and Y ≥ 4.

[0051] Referring to Figure 4 and Figure 5 , the temperature detection component 31 further includes an indicating rod 36. The indicating rod 36 is arranged along the sliding direction of the movable ring 37, and one end is welded to the side of the movable ring 37 facing away from the liquid cavity, and the other end extends outside the detection ring 32 for the convenience of the staff to observe.

[0052] Referring to Figure 6 and Figure 7, the voltage control component 4 includes a resistance rod 41 and two electrical connectors 42 made of conductive metal materials. The two electrical connectors 42 are defined as a movable electrode 421 and a fixed electrode 422 respectively. Among them, the fixed electrode 422 is fixed on the resistance rod 41 by screws. The resistance rod 41 is made of a conductive material with a relatively large resistance, such as manganese copper alloy, iron chromium aluminum alloy, etc. The movable electrode 421 is slidably connected to the resistance rod 41. Sliding the movable electrode 421 can increase or decrease the distance between the two electrical connectors 42. The two electrical connectors 42 are connected in series in the drive circuit of the drive member. By sliding the movable electrode 421, the size of the resistance inserted into the circuit is controlled, so as to realize the control of the voltage across the drive member, and further realize the control of the rotation speed of the DC motor.

[0053] Refer to Figure 6 and Figure 7 , one end of the indicating rod 36 away from the movable plate is fixed on the movable electrode 421, and the fixed electrode 422 is located on the side of the movable electrode 421 away from the movable ring 37. When the thermal drive member 35 is heated, it can drive the indicating rod 36 to move towards the direction close to the fixed electrode 422, thereby reducing the resistance inserted into the drive circuit of the DC motor and increasing the rotation speed of the DC motor. On the contrary, when the temperature gradually decreases, the indicating rod 36 gradually moves away from the fixed electrode 422, so that the rotation speed of the DC motor gradually decreases until it stops rotating, realizing the automatic power-off of the circulation fan 23. In this mode, the rotation speed of the DC motor gradually decreases, the speed of the gas circulation in the annealing furnace body 1 gradually decreases, and the speed of its temperature decrease also gradually decreases. In this mode, the temperature change curve in the annealing furnace body 1 shows rapid cooling first, and then slow cooling.

[0054] Refer to Figure 6 and Figure 7 , the resistance rod 41 is slidably connected to the main pipe 2111 along the direction parallel to the sliding direction of the indicating rod 36. By sliding the resistance rod 41, the resistance rod 41 can operate synchronously with the indicating rod 36, so that the rotation speed of the circulation fan 23 remains unchanged. In this mode, the temperature in the annealing furnace body 1 can drop uniformly.

[0055] Refer to Figure 6 and Figure 7, the voltage control component 4 further includes a timing module 5, and the timing module 5 is used to drive the resistance rod 41 to move at a uniform speed. The timing module 5 includes a cylinder 51, a piston 52, and an elastic member 53. The cylinder 51 is a housing structure with openings at both ends, and the cylinder 51 is arranged parallel to the resistance rod 41 and welded to the main pipeline 2111. The piston 52 is slidably fitted in the cylinder 51 along the length direction of the cylinder 51, and one end of the resistance rod 41 is fixed to the piston 52, realizing the sliding connection between the resistance rod 41 and the main pipeline 2111. A cover plate 54 is provided on the end surface of the cylinder 51 far from the resistance rod 41, and the cover plate 54 is used to block one end of the cylinder 51 far from the resistance rod 41. An exhaust micropore 55 is opened on the cover plate 54, and the exhaust micropore 55 penetrates through the cover plate 54. The elastic member 53 is arranged inside the cylinder 51 to apply a force to the piston 52 to make the piston 52 move in the direction close to the detection ring 32. In this embodiment, the elastic member 53 is a spring, one end of the spring is fixedly connected to the piston 52, and the other end is fixed to the cylinder 51. Under the action of the elastic member 53, the piston 52 can maintain the tendency to move in the direction close to the detection ring 32, and at the same time, the damping force brought by the exhaust micropore 55 can make the movement of the piston 52 tend to be uniform.

[0056] Referring to Figure 6 and Figure 7 , define the limit position close to the detection ring 32 of the movement trajectory of the piston 52 as the initial position of the piston 52. Without the action of external force, the piston 52 is stable at the initial position. During the actual cooling process of the annealing furnace body 1, according to the characteristics of the products in the furnace, the piston 52 can be first slid to make the piston 52 move away from the initial position. During the movement of the piston 52, the resistance rod 41 is driven to move, so that the distance between the two electrical connectors 42 is increased, the rotation speed of the circulation fan 23 is reduced, and the rotation speed of the circulation fan 23 is manually intervened to avoid damage to the products caused by too fast cooling. For example, for glass products, if their cooling is too fast, it will cause excessive elongation of the crystal grains and weakening of the grain boundaries.

[0057] Referring to Figure 6 and Figure 7 , after the position adjustment of the piston 52 is completed, under the action of the elastic member 53, the resistance rod 41 moves uniformly in the direction close to the detection ring 32. The indicating rod 36 changes with the change of the temperature inside the annealing furnace body 1. When the temperature of the annealing furnace body 1 changes too fast, the indicating rod 36 drives the movable electrode 421 to move relatively away from the fixed electrode 422, so that the rotation speed of the circulation fan 23 is automatically reduced. Similarly, when the temperature of the annealing furnace body 1 drops too slowly, the indicating rod 36 drives the movable electrode 421 to approach the fixed electrode 422, increasing the rotation speed of the circulation fan 23, so that the cooling speed of the temperature inside the annealing furnace body 1 tends to be uniform and the quality of the products is improved.

[0058] Referring to Figure 6 and Figure 7, the time for the piston 52 to move from the extreme position of the principle initial position to the initial position is 1 h. During the actual use of the annealing furnace body 1, the size of the exhaust micropores 55 can be determined according to the cooling rate required by the specific product, so as to adjust the time required for the entire movement stroke of the piston 52, and further adjust the cooling rate.

[0059] Referring to Figure 7 and Figure 8 , the timing module 5 further includes a protective cover 56. The protective cover 56 is a housing structure with an opening on one side. It covers the outside of the cover plate 54 and is welded to the air cylinder 51. The side wall of the cover plate 54 fits against the inner side wall of the protective cover 56 and is slidably fitted in the protective cover 56 along the length direction of the air cylinder 51. A large-displacement air hole 57 is provided on the side wall of the protective cover 56, and the large-displacement air hole 57 communicates with the inside of the protective cover 56. Sliding the cover plate 54 can make the cover plate 54 move away from the air cylinder 51, so that the inside of the air cylinder 51 communicates with the inside of the protective cover 56, and then the gas in the air cylinder 51 can be quickly discharged from the large-displacement air hole 57, which is convenient for the staff to move the piston 52 in the direction away from the detection ring 32.

[0060] Referring to Figure 7 and Figure 8 , the timing module 5 further includes a reset member 58. The reset member 58 is arranged inside the protective cover 56 and is used to keep the cover plate 54 in a tendency to move towards the air cylinder 51. In this embodiment, the reset member 58 is a spring. Under the action of the spring, the cover plate 54 can drive the cover plate 54 to automatically approach the air cylinder 51 and block one end of the air cylinder 51 away from the detection ring 32, so that when the piston 52 moves towards the detection ring 32, air can only enter from the exhaust micropores 55. When the staff applies a force to the piston 52 to make it move away from the detection ring 32, the air pressure inside the air cylinder 51 can overcome the elastic force of the reset member 58 to make it move away from the air cylinder 51, so that the air can be quickly discharged from the large-displacement air hole 57.

[0061] Referring to Figure 3 and Figure 6 , a valve 6 can be arranged between the temperature detection component 31 and the annealing furnace body 1 to block the spread of the furnace temperature to the temperature detection component 31 during the heating or heat preservation process of the annealing furnace body 1, so as to improve the heat preservation effect of the annealing furnace body 1. In addition, when the valve 6 is opened, the temperature spreads to the temperature detection component 31, so that the indicating rod 36 drives the movable electrode 421 to approach the fixed electrode 422, realizing the automatic start of the circulation fan 23. Of course, for special products, the staff needs to slide the piston 52 to adjust the position of the piston 52 after opening the valve 6.

[0062] The implementation principle of a rapid heating and cooling aluminum alloy annealing furnace in an embodiment of the present application is as follows: The temperature detection component 31 detects the temperature inside the annealing furnace body 1, and adjusts the rotation speed of the circulation fan 23 according to the temperature inside the annealing furnace body 1, thereby realizing the control of the cooling rate of the annealing furnace body 1, facilitating the manufacturer to set different temperature change curves for different products and improving the product quality.

[0063] The above are all the preferred embodiments of the present application, and are not used to limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A rapid heating and cooling aluminum alloy annealing furnace, comprising an annealing furnace body (1), characterized in that: It also includes a circulation pipeline (21) and a cooling system (22), wherein both ends of the circulation pipeline (21) are in communication with the interior of the annealing furnace body (1), the cooling system (22) is installed on the circulation pipeline (21) and is used for exchanging heat with the gas in the circulation pipeline (21), and the circulation pipeline (21) is also provided with a circulation fan (23) for driving the gas flow in the circulation pipeline (21); The circulation pipeline (21) is provided with a mode control device (3), and the mode control device (3) comprises a temperature detection component (31) and a voltage control component (4); The temperature detection assembly (31) comprises a detection ring (32), a heat drive component (35) and a movable ring (37); the detection ring (32) is hollow inside and communicates with the inside of the circulation pipe (21); the movable ring (37) is slidably connected inside the detection ring (32); the heat drive component (35) is installed inside the detection ring (32) and connected to the movable ring (37); the heat drive component (35) absorbs heat and can drive the movable ring (37) to move; The circulation pipeline (21) is provided with a timing module (5) for driving the resistance rod (41) to move at a uniform speed; The timing module (5) comprises an air cylinder (51), a piston (52) and a cover plate (54); the piston (52) is slidably fitted in the air cylinder (51); the resistance rod (41) is connected to the piston (52); the cover plate (54) is sealed at one end of the air cylinder (51) away from the resistance rod (41); an exhaust micro hole (55) is provided on the cover plate (54); and an elastic member (53) for continuously applying a force to the piston (52) is provided on the air cylinder (51); The piston is slidably fitted in the gas cylinder along the length direction of the gas cylinder, and one end of the resistance rod is fixed on the piston to realize the sliding connection between the resistance rod and the main pipeline; a cover plate is arranged on the end surface of the gas cylinder away from the resistance rod, and the cover plate is used to block the end of the gas cylinder away from the resistance rod, and exhaust micropores are opened on the cover plate, and the exhaust micropores penetrate the cover plate; The elastic member is arranged inside the gas cylinder and is used to exert a force on the piston to make the piston move in the direction close to the detection ring. The elastic member is a spring, one end of which is fixedly connected to the piston, and the other end is fixed to the gas cylinder. Under the action of the elastic member, the piston can maintain the tendency to move in the direction close to the detection ring, and at the same time, the damping force brought by the exhaust micropores can make the movement of the piston tend to uniform motion. After the position adjustment of the piston is completed, under the action of the elastic member, the resistance rod moves at a uniform speed in the direction close to the detection ring; the indicator rod changes with the temperature change in the annealing furnace body. When the temperature of the annealing furnace body changes too quickly, the indicator rod drives the movable electrode to move relatively away from the fixed electrode, so that the speed of the circulating fan is automatically reduced; when the temperature of the annealing furnace body decreases too slowly, the indicator rod drives the movable electrode to approach the fixed electrode, so that the speed of the circulating fan increases, so that the speed of temperature reduction in the annealing furnace body tends to be uniform; The timing module also includes a reset member, which is arranged inside the protective cover and is used to keep the cover plate moving in the direction close to the gas cylinder. Under the action of the reset member, the cover plate can drive the cover plate to automatically approach the gas cylinder and seal the end of the gas cylinder away from the detection ring, so that when the piston moves in the direction close to the detection ring, air can only enter from the exhaust micropores.

2. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 1, characterized in that: The cooling system (22) comprises a heat exchanger (221) and a cooling water tower (222); the heat exchanger (221) is connected to the circulation pipeline (21) and is used to exchange heat with the gas inside the circulation pipeline (21); and the cooling water tower (222) is connected to the heat exchanger (221) and is used to cool the heat exchanger (221).

3. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 1, characterized in that: The circulating fan (23) comprises a housing, blades rotatably connected to the inside of the housing, and a driving member fixed to the outside of the housing for driving the blades to rotate. A change in voltage across the driving member can cause a change in the rotation speed of the blades. The voltage control component (4) is used to control the voltage across the driving member. The temperature detection component (31) is used to detect the temperature of the gas inside the circulating pipe (21).

4. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 1, characterized in that: The temperature detection assembly (31) further comprises a drive ring (34), the drive ring (34) being rotatably disposed in the detection ring (32), the movable ring (37) being threadedly sleeved on the drive ring (34), and the heat drive member (35) being connected to the drive ring (34) and capable of driving the drive ring (34) to rotate.

5. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 3, characterized in that: The voltage control component (4) comprises a resistor rod (41) and two electrical connectors (42) made of a conductive material, the two electrical connectors (42) being arranged on the resistor rod (41) at intervals, and at least one of the electrical connectors (42) being able to slide along the length direction of the resistor rod (41), and the two electrical connectors (42) being connected in series to a drive circuit of a drive component.

6. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 5, characterized in that: The length direction of the resistance rod (41) is parallel to the sliding direction of the movable ring (37); the movable ring (37) is connected to an electrical connector (42) slidably connected to the resistance rod (41); movement of the movable ring (37) can drive movement of the electrical connector (42).

7. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 6, characterized in that: The resistance rod (41) is capable of sliding in a direction parallel to the sliding direction of the movable ring (37).

8. The rapid temperature rise and fall aluminum alloy annealing furnace according to claim 1, characterized in that: The cover plate (54) is capable of sliding in a direction parallel to the sliding direction of the piston (52), and the gas cylinder (51) is also provided with a reset member (58) for applying a force to the cover plate (54) so ​​that the cover plate (54) is close to the gas cylinder (51).

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