A horizontal cylindrical furnace

Abstract

The invention relates to a horizontal cylindrical furnace, which comprises a furnace body arranged horizontally, an inner cover body arranged inside the furnace body and capable of accommodating coils, a supporting mechanism capable of supporting the inner cover body and the coils, a heater for providing heat for heating the atmosphere in the inner cover body cavity, a heat equalization system, a cooling system, a vacuum pumping device, and a nitrogen charging device. The furnace body comprises a furnace body, a sealing plate fixedly sealed at one end of the furnace body in the length direction, and a furnace door sealed at the other end of the furnace body in the length direction and separable from the furnace body. The horizontal cylindrical furnace of the invention has an excellent airtight structure design, so that it can perform heat treatment on metals that are easy to oxidize, decarburize, and carburize, thereby solving the problem in the prior art that box-type furnaces cannot meet the airtightness requirements when heat treating metals with extremely high airtightness requirements, and also improves the application scope of the cylindrical furnace of the invention.

Description

Technical Field

[0001] The invention relates to the field of industrial heat treatment, and in particular to a horizontal cylindrical furnace. Background Art

[0002] Existing high-end metal coiled materials are mostly heat treated with bell-type furnaces or box-type furnaces with protective atmosphere. Although the bell-type furnace has good sealing, the operation process of loading and unloading is complicated. Although the operation of loading and unloading of the box-type furnace is relatively simple, its sealing is not as good as that of the bell-type furnace, and the structure is not compact; when the bell-type furnace anneals the coils, since the incoming materials (coils) are all placed vertically, in order to adapt to the circular space structure and flow field distribution of the inner cover, the coils need to be placed on the turning machine before loading, and the coils need to be turned to a horizontal state before being placed in the bell-type furnace. The heating cover also needs to be lifted during the loading process. In addition, a cooling cover needs to be taken for cooling the furnace charge; the entire heat treatment process of the bell-type furnace frequently requires manual operation, the process is complicated, and the level of automation is low. When the box-type furnace is heat treated, although it does not need to turn the coils, it does not need to hoist the heating cover and cooling cover. However, the cubic structure of the box-type furnace wastes a lot of space when loading cylindrical coils, and its poor airtightness is a major defect, resulting in a large consumption of energy and protective gas for the box-type furnace and high heat treatment costs. In addition, for metals that are easily oxidized, decarburized, and carburized during heat treatment (such as copper and copper alloys with high airtightness requirements), the box-type furnace cannot meet the extremely high requirements for airtightness during the heat treatment process, making its scope of application relatively narrow. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a horizontal cylindrical furnace.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A horizontal cylindrical furnace, the cylindrical furnace comprises a furnace body arranged horizontally, an inner cover body arranged inside the furnace body and capable of accommodating coils, a supporting mechanism capable of supporting the inner cover body and the coils, a heater for providing heat for heating the atmosphere in the inner cover body cavity, a heat equalization system for uniformly distributing the hot atmosphere in the inner cover body cavity, a cooling system for cooling the atmosphere in the inner cover body cavity, a vacuuming device for vacuuming the inner cover body and the cooling system, and a nitrogen filling device for filling nitrogen into the inner cover body cavity. The furnace body comprises a furnace body, a sealing plate fixedly sealed at one end of the furnace body in the length direction, and a furnace door sealed at the other end of the furnace body in the length direction and separable from the furnace body, one end of the inner cover body in the length direction is fixed to the sealing plate, and the other end of the inner cover body in the length direction can be sealed with the furnace door.

[0006] Preferably, the furnace body is cylindrical and the inner cover is cylindrical.

[0007] Preferably, the inner cover body extends entirely or partially in a corrugated shape in its length direction.

[0008] Preferably, the heater is arranged on the inner circumference of the furnace body, and the heat distribution system is used to evenly transfer the heat transferred from the heater to the inner cover body to the coil.

[0009] Preferably, the heat equalization system includes a guide tube arranged in the inner cover body cavity, the guide tube has an air inlet and an air outlet located at corresponding two ends of its axial direction, a guide heating channel is formed between the guide tube and the inner cover body, and the coil is located inside the guide tube and between the air inlet and the air outlet; the heat equalization system also includes a circulating fan for circulating the gas inside the guide tube and the guide heating channel.

[0010] Preferably, the circulation fan is arranged outside the guide tube, and the air outlet of the guide tube is arranged corresponding to the suction port of the circulation fan.

[0011] Preferably, the air outlet of the guide tube is located in the radial middle of the guide tube, and the air outlet of the guide tube corresponds to the radial middle of the coil.

[0012] Preferably, the cooling system includes a heat exchanger connected to the inner cover cavity through an air inlet pipe and an air outlet pipe, a guide fan, and valves arranged on the air inlet pipe and the air outlet pipe.

[0013] Preferably, the supporting mechanism includes a supporting assembly fixedly docked with the furnace body, a sliding frame slidably arranged relative to the supporting assembly along the length direction of the furnace body, one end of the sliding frame is fixedly connected to the furnace door, and the coil is supported on the sliding frame; the sliding frame has a first station and a second station, when the sliding frame is located at the first station, the furnace door is away from the furnace body along the length direction of the furnace body, and the coil can be placed on the sliding frame; when the sliding frame is located at the second station, the furnace door and the furnace body are close to each other, the sliding frame and the coil thereon are in the cavity of the inner cover body, and the cavity of the inner cover body is closed, and the coil can undergo heat treatment.

[0014] Preferably, the support assembly includes support rails located on both sides of the inner cover body cavity and extending along the length direction of the furnace body, and support columns fixedly connected to the furnace body and providing support for the support rails; the sliding frame includes a base frame with a pulley rotatably arranged at the bottom, and vertical blocks sequentially arranged on the base frame in the length direction of the furnace body, one end of the base frame is fixedly connected to the furnace door, and the coil is laid on the vertical blocks on both sides through a cross beam; the cylindrical furnace also includes a trolley for driving the furnace door to move and thereby driving the sliding frame to move.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] The horizontal cylindrical furnace of the present invention is also provided with an inner cover body inside the furnace body, which provides an excellent enclosed space for the heat treatment of coils, and provides atmosphere protection for the heat treatment of coils in the enclosed space through the coordinated design of a vacuum pumping device, a nitrogen filling device, etc.; in addition, through the design of a heat equalization system and a cooling system, a solid quality guarantee is provided for the heat treatment of coil products by the cylindrical furnace of the present invention; the horizontal cylindrical furnace of the present invention is designed with an excellent airtight structure, so that it can perform heat treatment on metals that are easy to oxidize, decarburize, and carburize, which solves the problem that the box-type furnace cannot meet the airtightness requirements when heat treating metals with extremely high airtightness requirements in the prior art, and also improves the scope of application of the cylindrical furnace of the present invention; in addition, the present invention changes the vertical design of the traditional heating furnace, places the furnace body horizontally, and through a new design of a support mechanism coordinated with the furnace door, the cylindrical furnace of the present invention does not need to turn the coil to a horizontal state when loading, eliminating the work of hoisting and turning the material, and loading is more convenient; there is no work of replacing the cover body during cooling, and the atmosphere in the furnace is directly cooled by the cooling system, which greatly improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the side view of the cylindrical furnace of the present invention (the sliding frame is in the second working position);

[0018] Figure 2 It is a schematic diagram of the side view of the cylindrical furnace of the present invention (the sliding frame is in the first working position);

[0019] Figure 3 for Figure 1 Middle AA section view;

[0020] Among them: 10, furnace body; 101, flange; 102, sealing ring; 11, sealing plate; 12, furnace door; 13, inner cover; 20, circulating fan; 21, guide tube; 211, air inlet; 212, air outlet; 300, pulley; 301, base frame; 302, vertical block; 303, support column; 304, support rail; 41, bracket; 42, frame; 43, drive motor; 50, heater; 60, heat exchanger; 61, air inlet pipe; 62, air outlet pipe; 70, vacuum device; 80, nitrogen filling device; 1000, coil; 1001, crossbeam. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figures 1 to 3As shown, a horizontal cylindrical furnace comprises a furnace body arranged horizontally, an inner cover body 13 (the inner cover body 13 is cylindrical) arranged inside the furnace body and capable of accommodating a coil 1000, a supporting mechanism capable of supporting the inner cover body 13 and the coil 1000, a heater 50 for providing heat for heating the atmosphere in the cavity of the inner cover body 13, a heat equalization system for uniformly distributing the hot atmosphere in the cavity of the inner cover body 13, a cooling system for cooling the atmosphere in the cavity of the inner cover body 13, a vacuuming device 70 for vacuuming the inner cover body 13 and the cooling system, and a nitrogen filling device 80 for filling nitrogen into the cavity of the inner cover body 13. The furnace body includes a furnace body 10 (the furnace body 10 is cylindrical), a sealing plate 11 fixedly sealed at one end of the furnace body 10 in the length direction, and a furnace door 12 sealed at the other end of the furnace body 10 in the length direction and separable from the furnace body 10. One end of an inner cover body 13 in the length direction is fixed to the sealing plate 11, and the other end of the inner cover body 13 in the length direction can be sealed with the furnace door 12. A flange 101 is provided on one end of the furnace body 10 and the inner cover body 13 close to the furnace door 12, and a sealing ring 102 is provided on the flange 101. When the furnace door 12, the furnace body 10 and the inner cover body 13 are close to each other, the furnace door 12 and the flange 101 are sealed by the sealing ring 102.

[0023] In this example, the heater 50 is arranged on the inner circumference of the furnace body 10, and the heat of the heater 50 is transferred to the inner cover 13, and the inner cover 13 is entirely or partially extended in a corrugated shape in the length direction. The corrugated structure can effectively eliminate the thermal expansion of the inner cover 13, and can also greatly increase the heat exchange area of ​​the inner cover, improve the heat exchange efficiency, so that the heat generated by the heater 50 can be effectively received;

[0024] The heat distribution system is used to evenly transfer the heat transferred from the heater 50 to the inner cover 13 to the coil 1000;

[0025] Specifically, the heat equalization system includes a guide tube 21 and a circulation fan 20 arranged in the cavity of the inner cover body 13. The guide tube 21 has an air inlet 211 and an air outlet 212 located at corresponding ends of its axial direction. A guide heating channel is formed between the guide tube 21 and the inner cover body 13. The coil 1000 is located inside the guide tube 21 and between the air inlet 211 and the air outlet 212; the circulation fan 20 is used to circulate the gas inside the guide tube 21 and the guide heating channel. The circulation fan 20 (a centrifugal fan) is arranged outside the guide tube 21, and the air outlet 212 of the guide tube 21 is arranged corresponding to the suction port of the fan.

[0026] The air in the guide tube 21 is sucked into the circulation fan 20 through the air outlet 212 of the guide tube 21 by the suction port of the circulation fan 20 and discharged from the discharge port of the circulation fan 20 to the guide heating channel. When the air passes through the guide heating channel, it exchanges heat with the heat around the inner cover 13. After being heated, the air enters the guide tube 21 through the air inlet 211 of the guide tube 21 and uniformly heats the coil 1000 inside the guide tube 21.

[0027] In addition, the air outlet 212 of the guide tube 21 (the air outlet 212 is circular) is smaller than the air inlet 211 of the guide tube 21 (the air inlet 211 is circular, and the diameter of the air outlet 212 is equal to the inner diameter of the guide tube 21), and the air outlet 212 of the guide tube 21 is located in the radial middle of the guide tube 21, and the air outlet 212 of the guide tube 21 corresponds to the radial middle of the coil 1000; through the position design of the air inlet 211 and the air outlet 212, and the relative position design of the two and the coil 1000, the hot air entering the interior of the guide tube 21 from the air inlet 211 will not gather and pass through one place, but a part of it will be dispersed and pass through the outer periphery of the coil 1000, and the other part will be dispersed and pass through the inner periphery of the coil 1000, so that the coil 1000 is heated very evenly, thereby improving the heat treatment efficiency of the coil 1000.

[0028] Furthermore, the supporting mechanism includes a supporting assembly fixedly docked with the furnace body 10, a sliding frame slidably arranged relative to the supporting assembly along the length direction of the furnace body 10, one end of the sliding frame is fixedly connected to the furnace door 12, and the coil 1000 is supported on the sliding frame; the sliding frame has a first station and a second station, when the sliding frame is located at the first station, the furnace door 12 is away from the furnace body 10 along the length direction of the furnace body 10, and the coil 1000 can be placed on the sliding frame; when the sliding frame is located at the second station, the furnace door 12 is close to the furnace body 10, the sliding frame and the coil 1000 thereon are in the cavity of the inner cover body 13, and the cavity of the inner cover body 13 is closed, and the coil 1000 can be subjected to heat treatment operations. Specifically, the support assembly includes support rails 304 located on both lateral sides of the cavity of the inner cover body 13 and extending along the length direction of the furnace body 10, and support columns 303 fixedly connected to the furnace body 10 and providing support for the support rails 304. There are multiple support columns 303. In this example, the upper ends of the multiple support columns 303 are fixedly connected to the support rails 304, and the lower ends downwardly pass through the guide tube 21, the inner cover body 13, and the furnace body 10 to the bottom of the furnace body 10, and can be supported on the ground. The support rails 304, the guide tube 21, the inner cover body 13, and the furnace body 10 can all be fixedly connected to the support columns 303.

[0029] The sliding frame includes a base frame 301 with a pulley 300 rotatably arranged at the bottom, and blocks 302 arranged on the base frame 301 in sequence in the length direction of the furnace body 10. One end of the base frame 301 is fixedly connected to the furnace door 12, and the coil 1000 is placed on the blocks 302 on both sides through the crossbeam 1001; in this example, two or three rolls, or more rolls of products can be placed in the furnace for heat treatment. When two rolls of products are placed on a crossbeam 1001, three blocks 302 need to be set, and then the crossbeam 1001 is placed on the blocks 302, two blocks 302 are located at both ends of the crossbeam 1001, and one block 302 is located in the middle of the crossbeam 1001 (between the two rolls of products). When three rolls of products are placed in the furnace, four blocks 302 can be arranged in sequence, and so on.

[0030] In addition, the cylindrical furnace also includes a trolley for driving the furnace door 12 to move and then drive the sliding frame to move. The trolley includes a bracket 41 fixedly connected to the furnace door 12, a frame 42 with wheels installed, and a driving motor 43 for driving the wheels to rotate.

[0031] The trolley drives the furnace door 12 to move by driving the motor 43. When the coil 1000 needs to be loaded or the heat-treated coil 1000 needs to be taken out, the trolley drives the furnace door 12 away from the furnace body 10 and the inner cover 13 and pulls the sliding frame out of the furnace until the sliding frame moves to the first station. At this time, the end of the sliding frame away from the furnace door 12 is still placed on the support rail 304, and the operator can perform loading or unloading operations; when the loading is completed and the coil product needs to be heat-treated, the trolley will drive the furnace door 12 to move closer to the end of the furnace body 10 and the inner cover 13 and push the sliding frame and the coil 1000 thereon into the furnace until the sliding frame moves to the second station. At this time, the furnace door 12 is completely closed (the furnace door 12 is pressed by the clamping mechanism), and the coil 1000 is also placed in a suitable position in the furnace, and the coil 1000 can be heat-treated.

[0032] Furthermore, the cooling system includes a heat exchanger 60 connected to the inner cavity of the inner cover 13 through an air inlet pipe 61 and an air outlet pipe 62, a guide fan (not shown in the figure), and valves arranged on the air inlet pipe 61 and the air outlet pipe 62. When the coil 1000 is cooled, there is no need to replace the cover, and the atmosphere in the furnace is directly cooled by the cooling system, which reduces the operation steps and further improves the work efficiency.

[0033] Furthermore, the vacuum device 70 is used to evacuate the furnace after the loading is completed and before the heating treatment is carried out, and then the protective gas (nitrogen) is filled into the furnace through the nitrogen filling device 80. The vacuuming provides a process environment with little oxygen (or nearly oxygen-free) for the heat treatment process; by further backfilling with neutral or inert gas after vacuuming, a cleaner protective atmosphere environment under different pressures is achieved. After vacuuming, since the partial pressure content of oxygen in the atmosphere is lower than the decomposition pressure of the oxide on the surface of the heated metal, the oxidation effect is suppressed, so the brightness of the surface of the treated metal product can remain unchanged to a large extent compared with the original surface.

[0034] In addition, before the coil 1000 is cooled after being heated, the inner cavity of the heat exchanger 60 needs to be evacuated by the vacuum device 70 to prevent the impurities in the inner cavity of the heat exchanger 60 from entering the furnace when the product is cooled, thereby ensuring the heat treatment quality of the product.

[0035] In summary, the horizontal cylindrical furnace of the present invention is further provided with an inner cover body inside the furnace body, which provides an excellent enclosed space for the heat treatment of coils, and provides atmosphere protection for the heat treatment of coils in the enclosed space through the coordinated design of a vacuum pumping device, a nitrogen filling device, etc.; in addition, through the design of a heat-saturating system and a cooling system, a solid quality guarantee is provided for the heat treatment of coil products by the cylindrical furnace of the present invention; the horizontal cylindrical furnace of the present invention is designed with an excellent airtight structure, so that it can perform heat treatment on metals that are easy to oxidize, decarburize, and carburize, which solves the problem in the prior art that the box-type furnace cannot meet the airtightness requirements when heat treating metals with extremely high airtightness requirements, and also The application scope of the cylindrical furnace of the present invention is improved; in addition, the present invention changes the vertical design of the traditional heating furnace, places the furnace body horizontally, and through the new design of the support mechanism cooperating with the furnace door, the cylindrical furnace of the present invention does not need to turn the coil to a horizontal state when loading, eliminating the work of hoisting and turning the material, and loading is more convenient; when the furnace door is opened, the coil product in the furnace is also pulled out synchronously, and when the furnace door is closed, the coil product is also pushed into the furnace synchronously, and the coil product can be put in and taken out by opening and closing the furnace door. The operation steps are simple, the operation is convenient, and the work efficiency is improved. There is no need to replace the cover during cooling, and the atmosphere in the furnace is directly cooled by the cooling system, which further improves the work efficiency.

[0036] The above is a detailed description of the present invention, the purpose of which is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and it is not intended to limit the scope of protection of the present invention. The present invention is not limited to the above-mentioned embodiments. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A horizontal cylindrical furnace comprising: A furnace body, the furnace body is arranged horizontally, and the furnace body comprises a cylindrical furnace body, a sealing plate fixedly sealing one end of the furnace body in the length direction, and a furnace door sealed at the other end of the furnace body in the length direction and detachable from the furnace body; An inner cover body, the inner cover body is cylindrical, the inner cover body is arranged inside the furnace body and can accommodate the coil, one end of the inner cover body in the length direction is fixed to the sealing plate, and the other end of the inner cover body in the length direction can be sealed with the furnace door; A supporting mechanism, wherein the supporting mechanism is capable of supporting the inner cover and the coiled material; A heater, the heater providing heat for heating the atmosphere in the inner cover cavity; the heater is arranged on the inner circumference of the furnace body; A heat-averaging system, the heat-averaging system is used to evenly distribute the hot atmosphere in the inner cover body cavity; the heat-averaging system includes a guide tube and a circulating fan, the guide tube is arranged in the inner cover body cavity, the guide tube has an air inlet and an air outlet located at two corresponding ends of the axial direction, the air inlet and the air outlet are circular, and a guide heating channel is formed between the guide tube and the inner cover body; A cooling system, the cooling system is used to cool the atmosphere in the inner cover cavity; A vacuuming device, the vacuuming device is used to vacuum the inner cover and the cooling system; A nitrogen filling device, the nitrogen filling device is used to fill nitrogen into the inner cover body cavity; Features: The inner cover body is entirely extended in a corrugated shape in the length direction; the air outlet is smaller than the air inlet, the air outlet is located in the radial middle of the guide cylinder, and corresponds to the radial middle of the coil; the circulation fan is arranged outside the guide cylinder, and the suction port of the circulation fan is arranged corresponding to the air outlet; The suction port of the circulation fan sucks the gas inside the guide tube from the air outlet and discharges it from the exhaust port of the circulation fan to the guide heating channel. When the gas passes through the guide heating channel, it exchanges heat with the heat around the inner cover body. After being heated, the gas enters the guide tube from the air inlet. The hot air entering the guide tube from the air inlet will not gather and pass through one place, but a part of it will be dispersed to pass through the outer periphery of the coil, and the other part will be dispersed to pass through the inner periphery of the coil, so as to evenly heat the coil inside the guide tube.

2. The horizontal cylindrical furnace according to claim 1, characterized in that: The cooling system comprises a heat exchanger connected with the inner cover cavity through an air inlet pipe and an air outlet pipe, a flow guide fan, and valves arranged on the air inlet pipe and the air outlet pipe.

3. The horizontal cylindrical furnace according to claim 1, characterized in that: The support mechanism includes a support assembly fixedly docked with the furnace body, a sliding frame slidably arranged relative to the support assembly along the length direction of the furnace body, one end of the sliding frame is fixedly connected to the furnace door, and the coil is supported on the sliding frame; the sliding frame has a first station and a second station, when the sliding frame is located at the first station, the furnace door is away from the furnace body along the length direction of the furnace body, and the coil can be placed on the sliding frame; when the sliding frame is located at the second station, the furnace door is close to the furnace body, the sliding frame and the coil thereon are in the cavity of the inner cover body, and the cavity of the inner cover body is closed, and the coil can undergo heat treatment.

4. The horizontal cylindrical furnace according to claim 3, characterized in that: The support assembly includes support rails located on both sides of the inner cover cavity and extending along the length direction of the furnace body, and support columns fixedly connected to the furnace body and providing support for the support rails; the sliding frame includes a base frame with a pulley rotatably arranged at the bottom, and vertical blocks sequentially arranged on the base frame in the length direction of the furnace body, one end of the base frame is fixedly connected to the furnace door, and the coil is laid on the vertical blocks on both sides through a crossbeam; the cylindrical furnace also includes a trolley for driving the furnace door to move and thereby driving the sliding frame to move.

5. The horizontal cylindrical furnace according to claim 4, characterized in that: There are multiple support columns, and the upper ends of the multiple support columns are fixedly connected to the support rails, and the lower ends downwardly pass through the guide tube, the inner cover, and the furnace body to the bottom of the furnace body and are supported on the ground. The support rails, the guide tube, the inner cover, the furnace body and the support columns are fixedly connected.

6. The horizontal cylindrical furnace according to claim 1, characterized in that: A flange is arranged on one end of the furnace body and the inner cover body close to the furnace door, and a sealing ring is arranged on the flange. When the furnace door, the furnace body and the inner cover body are close to each other, the furnace door and the flange are sealed by the sealing ring.

7. The horizontal cylindrical furnace according to claim 3, characterized in that: The sliding frame includes a base frame with a pulley rotatably arranged at the bottom, and vertical blocks arranged on the base frame in sequence in the length direction of the furnace body. One end of the base frame is fixedly connected to the furnace door, and the coil is laid on the vertical blocks on both sides through a crossbeam.

Images