Anti-oxidation continuous heat treatment furnace

Abstract

The invention relates to the field of heat treatment furnaces, and discloses an anti-oxidation continuous heat treatment furnace which comprises a furnace body outer wall, a furnace top is fixed to the top face of the furnace body outer wall, a plurality of electric heaters are arranged on the inner bottom face of the furnace body outer wall, inlets and outlets are formed in the two sides of the furnace body outer wall, and a conveying belt is arranged in the furnace body outer wall. The two ends of the conveying belt are close to the two inlets and outlets correspondingly, baffles are rotationally arranged in the inlets and outlets, the two sides of the baffles are hinged to the two sides of the interiors of the inlets and outlets correspondingly, attaching grooves are formed in the bottom faces of the interiors of the inlets and outlets, the attaching grooves are attached to the bottom ends of the baffles, and a soaking net is arranged in the outer wall of the furnace body. And the soaking net is positioned above the electric heater. According to the invention, the baffle plate can swing inside and outside the furnace body by taking the hinged part as an axis, and can recover to a vertical position in time when in a static state, so that external air continuously entering the furnace is reduced as much as possible, and oxidation of a workpiece is slowed down.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment furnaces, in particular to an anti-oxidation continuous heat treatment furnace. Background Art

[0002] Heat treatment furnace is a common device in the process of heat treatment of metal materials. Commonly used heat treatment furnaces include box-type resistance furnaces, pit-type resistance furnaces, gas carburizing furnaces and salt bath furnaces. Continuous furnaces are usually used in factories, that is, workpieces are continuously loaded from the loading door, passed through the furnace, and continuously unloaded from the discharge door. The workpieces are usually transported in the furnace by placing them on heat-resistant steel guide rails and moving them with stepping moving beams or push rods.

[0003] In the prior art, for this type of continuous large-scale heat treatment furnace commonly used in factories, if outside air enters the furnace, the oxygen in the air will chemically react with the metal elements on the surface of the workpiece, causing rapid oxidation of the workpiece surface. This oxidation will not only affect the surface quality of the workpiece, but may also change its physical and chemical properties, thereby affecting the performance and service life of the workpiece. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-oxidation continuous heat treatment furnace to solve the problem that oxidation not only affects the surface quality of a workpiece, but may also change its physical and chemical properties, thereby affecting the performance and service life of the workpiece.

[0005] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical scheme: an anti-oxidation continuous heat treatment furnace, comprising an outer wall of a furnace body, a furnace top is fixed on the top surface of the outer wall of the furnace body, a plurality of electric heaters are arranged on the inner bottom surface of the outer wall of the furnace body, inlets and outlets are opened on both sides of the outer wall of the furnace body, a conveyor belt is arranged inside the inner wall of the furnace body, and the two ends of the conveyor belt are respectively close to the two inlets and outlets, a baffle is rotatably arranged inside the inlet and outlet, and the two sides of the baffle are respectively hinged to the inner sides of the inlet and outlet, a fitting groove is opened on the inner bottom surface of the inlet and outlet, and the fitting groove is fitted with the bottom end of the baffle, and a heat equalizing network is arranged inside the outer wall of the furnace body, and the heat equalizing network is located above the electric heater.

[0006] Preferably, a furnace body is arranged inside the outer wall of the furnace body, a heat-resistant thermal insulation layer is arranged inside the furnace body, and a glass fiber layer is arranged inside the heat-resistant thermal insulation layer.

[0007] Preferably, an air supply box is provided on one side of the outer wall of the furnace body, an air supply pipe is fixedly inserted on one side of the air supply box, a first fan is fixed to one end of the air supply pipe, a connecting pipe is fixed to one end of the air outlet pipe of the first fan, and a supporting arc plate is fixed to the inner side of the furnace body wall, and the supporting arc plate supports one end of the connecting pipe upward.

[0008] Preferably, a plurality of diversion holes are opened on the surface of the connecting pipe, and a diversion pipe is fixedly inserted inside the diversion hole.

[0009] Preferably, the top surface of the furnace roof is fixedly connected with a circulation pipe, one end of the circulation pipe is detachably provided with a threaded barrel, the internal thread of the threaded barrel is connected with a mounting barrel, one end of the mounting barrel is fixedly connected with a return pipe, a second fan is provided on the return pipe, the return pipe is fixedly connected with the air supply pipe, an mounting groove is provided inside the mounting barrel, a filter ring is slidably provided inside the mounting groove, and a filter net is fixed inside the filter ring.

[0010] Preferably, two limit strips are fixed on the inner wall surface of the mounting groove, and two limit grooves are provided on the surface of the filter ring. The limit strips and the limit grooves are slidably arranged. A fixing hole is provided at one end of the inner part of the threaded barrel, and a sealing ring is fixed at one end of the inner part of the threaded barrel. The sealing ring is fixedly inserted into the fixing hole, and two extrusion columns are fixed on one side of the sealing ring. The sealing ring has an interference fit with the circulation pipe.

[0011] Preferably, a cover plate is rotatably provided on the top surface of the air supply box, a plurality of hinges are provided on one side of the air supply box, the air supply box and the cover plate are rotatably provided by the hinges, a bottom plate is fixed to the bottom surface of the cover plate, an elastic plate is fixed to the bottom surface of the bottom plate, and the elastic plate is interference fit with the air supply box.

[0012] Preferably, support columns are fixed at four corners of the bottom surface of the outer wall of the furnace body, and a stabilizing plate is fixed at the bottom end of the support column.

[0013] Compared with the prior art, an anti-oxidation continuous heat treatment furnace using the above technical solution has the following beneficial effects:

[0014] 1. The outer wall of the furnace body is made of asbestos, the heat-resistant insulation layer is made of aluminum silicate refractory fiber, and the glass fiber layer. The main function of the glass fiber layer is to efficiently reflect the heat in the furnace. In addition, the furnace top is an upper arch structure, which can reflect the heat radiated to the upper part of the furnace to the workpiece at the lower part. The characteristic of the arch structure is that it is more concentrated when reflecting heat, which can ensure that the heat is reflected to the part where the workpiece is located, which can greatly improve the utilization rate of heat and reduce energy consumption. The electric heater is in working state. At this time, the heat generated by the electric heater is evenly distributed using a heat spreader, so that the temperature distribution in the furnace is more uniform, so as not to affect the quality of heat treatment. At the same time, the mesh heat spreader The net will not have too much impact on the passage of heat, but can increase the temperature inside the outer wall of the furnace body. Then the staff will place the workpieces one by one on the top of the conveyor belt. The conveyor belt is made of heat-resistant steel wire and is used to realize continuous loading and unloading of workpieces. When the workpiece is placed on the top of the conveyor belt from the inlet and outlet on one side, it will be subjected to high-temperature treatment on the inner wall of the outer wall of the furnace body, and then removed from the inlet and outlet on the other side of the outer wall of the furnace body. In this process, the baffle is hinged inside the inlet and outlet, so the baffle will swing inside and outside the furnace body with the hinged part as the axis, and will return to the vertical position in time when it is in a stationary state, so as to minimize the continuous entry of external air into the furnace and slow down the oxidation of the workpiece.

[0015] Second, the staff can put dry ice (solid carbon dioxide) inside the gas supply box. The dry ice put on the gas supply box will be gasified into a large amount of carbon dioxide. The carbon dioxide in the gas supply box will be extracted by the first fan and enter the connecting pipe through the gas supply pipe. Finally, the carbon dioxide in the connecting pipe will enter the furnace through the shunt pipe, and the oxygen in the furnace can be discharged from the inlet and outlet 5, and the space in the furnace will form a positive pressure, so that the entry of external oxygen can be reduced when the baffle is active, accelerating the oxidation and decarburization of the workpiece. In addition, the carbon dioxide will decompose a part of the activated carbon at high temperature, which can inhibit the surface decarburization of the workpiece.

[0016] 3. When the second fan is working, the air in the furnace will be drawn into the inside of the circulation pipe, and enter the inside of the threaded cylinder and the installation cylinder along the circulation pipe, and finally flow back to the inside of the gas supply pipe through the return pipe. When the gas in the furnace enters the inside of the installation cylinder, the gas will pass through the filter net, and the smoke and dust in the gas can be filtered and purified in Chengdu, thereby improving the environment of the workshop. When the filter net has been used for too long, the staff will rotate the threaded cylinder, remove the threaded cylinder from the installation cylinder, and then remove the filter ring from the installation cylinder and replace the new filter ring and filter net, thereby increasing the convenience of replacing the filter net for the staff;

[0017] 4. After the dry ice is put into the gas supply box, the staff will buckle the cover plate on the top surface of the gas supply box, so that the elastic plate is interference fit into the interior of the gas supply box, and the top surface of the gas supply box is fit with the bottom surface of the bottom plate, which can increase the sealing between the gas supply box and the cover plate to prevent the leakage of carbon dioxide inside the gas supply box. When the heat treatment furnace is placed on the ground, the heat treatment furnace will be supported upward by the support column and the stabilizing plate will be used to increase the contact area between the support column and the ground, thereby increasing the friction between the stabilizing plate and the ground, thereby increasing the stability of the heat treatment furnace on the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment.

[0019] Figure 2 It is an exploded perspective schematic diagram of an embodiment.

[0020] Figure 3 It is a schematic diagram of the explosion of the heat equalizing network and the inlet and outlet in the embodiment.

[0021] Figure 4 It is a schematic diagram of the explosion of the cover plate and the bottom plate in the embodiment.

[0022] Figure 5 It is a schematic diagram of the explosion between the connecting pipe and the supporting arc plate in the embodiment.

[0023] Figure 6 It is an exploded schematic diagram of the threaded cylinder and the mounting cylinder in the embodiment.

[0024] Figure 7 for Figure 3 A schematic diagram of the enlarged local structure in the middle.

[0025] In the figure: 1. outer wall of furnace body; 2. furnace top; 3. electric heater; 4. conveyor belt; 5. inlet and outlet; 6. fitting groove; 7. baffle; 8. heat-saturating net; 9. furnace body; 10. heat-resistant insulation layer; 11. glass fiber layer; 12. air supply box; 13. air supply pipe; 14. first fan; 15. connecting pipe; 16. supporting arc plate; 17. diversion hole; 18. diversion pipe; 19. circulation pipe; 20. threaded cylinder; 21. return pipe; 22. second fan; 23. cover plate; 24. bottom plate; 25. elastic plate; 26. mounting cylinder; 27. mounting groove; 28. filter ring; 29. ​​filter net; 30. limit strip; 31. limit groove; 32. fixing hole; 33. sealing ring; 34. extrusion column; 35. support column; 36. stabilizing plate. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, an anti-oxidation continuous heat treatment furnace comprises an outer wall 1 of a furnace body, a furnace top 2 is fixed on the top surface of the outer wall 1 of the furnace body, a plurality of electric heaters 3 are arranged on the inner bottom surface of the outer wall 1 of the furnace body, inlets and outlets 5 are provided on both sides of the outer wall 1 of the furnace body, a conveyor belt 4 is arranged inside the outer wall 1 of the furnace body, and the two ends of the conveyor belt 4 are respectively close to the two inlets and outlets 5, baffles 7 are rotatably arranged inside the inlet and outlet 5, and the two sides of the baffle 7 are respectively hinged to the inner sides of the inlet and outlet 5, a fitting groove 6 is arranged on the inner bottom surface of the inlet and outlet 5, and the fitting groove 6 is fitted with the bottom end of the baffle 7, a heat-saturating net 8 is arranged inside the outer wall 1 of the furnace body, and the heat-saturating net 8 is above the electric heater 3, a furnace body 9 is arranged inside the outer wall 1 of the furnace body, a heat-resistant thermal insulation layer 10 is arranged inside the furnace body 9, and a glass fiber layer 11 is arranged inside the heat-resistant thermal insulation layer 10.

[0028] In use, the outer wall 1 of the furnace body made of asbestos, the heat-resistant insulation layer 10 made of aluminum silicate refractory fiber and the like, and the glass fiber layer 11 are used. The main function of the glass fiber layer 11 is to efficiently reflect the heat in the furnace. In addition, the furnace top 2 is an upper arch structure, so the heat radiated to the upper part of the furnace can be reflected again to the workpiece at the lower part. The characteristic of the arch structure is that it is more concentrated when reflecting heat, which can ensure that the heat is reflected to the part where the workpiece is located, which can greatly improve the utilization rate of heat and reduce energy consumption. The electric heater 3 is in a working state. At this time, the heat generated by the electric heater 3 is evenly distributed by the heat-scaling net 8, so that the temperature distribution in the furnace is more uniform, so as not to affect the quality of heat treatment. At the same time, the mesh heat-scaling net 8 will not cause too much influence on the passage of heat, and can increase the temperature inside the outer wall 1 of the furnace body. Then the staff will place the workpieces one by one on the top surface of the conveyor belt 4. The conveyor belt 4 is made of heat-resistant steel wire. The conveyor belt 4 is used to realize continuous loading and unloading of the workpieces. When the workpiece is placed on the top surface of the conveyor belt 4 from the inlet and outlet 5 on one side, it is subjected to high-temperature treatment on the inner wall of the outer wall 1 of the furnace body, and then removed from the inlet and outlet 5 on the other side of the furnace body 1. In this process, the baffle 7 is hinged inside the inlet and outlet 5, so the baffle 7 will swing inside and outside the furnace body 9 with the hinged part as the axis, and the baffle 7 will return to the vertical position in time when it is in a stationary state, so as to minimize the continuous entry of external air into the furnace and slow down the oxidation of the workpiece.

[0029] like Figure 2 , Figure 3 and Figure 5As shown, an air supply box 12 is provided on one side of the outer wall 1 of the furnace body, an air supply pipe 13 is fixedly inserted on one side of the air supply box 12, a first fan 14 is fixed on one end of the air supply pipe 13, a connecting pipe 15 is fixed on one end of the air outlet pipe of the first fan 14, a supporting arc plate 16 is fixed on one side of the inner side of the furnace body wall 1, the supporting arc plate 16 supports one end of the connecting pipe 15 upwards, a plurality of diversion holes 17 are opened on the surface of the connecting pipe 15, and a diversion pipe 18 is fixedly inserted inside the diversion hole 17.

[0030] During use, the staff can put dry ice (solid carbon dioxide) inside the air supply box 12. The dry ice put on the air supply box 12 will vaporize into a large amount of carbon dioxide. The carbon dioxide in the air supply box 12 will be extracted by the first fan 14 and enter the connecting pipe 15 through the air supply pipe 13. Finally, the carbon dioxide in the connecting pipe 15 will enter the furnace through the diversion pipe 18, and the oxygen in the furnace can be discharged from the inlet and outlet 5, and a positive pressure can be formed in the space inside the furnace, thereby reducing the entry of external oxygen when the baffle 7 is active, accelerating the oxidation and decarburization of the workpiece. In addition, the carbon dioxide will decompose a part of the activated carbon at high temperature, which can inhibit the surface decarburization of the workpiece.

[0031] like Figure 2 , Figure 3 and Figure 6 As shown, the top surface of the furnace top 2 is fixedly connected with a circulation pipe 19, one end of the circulation pipe 19 is detachably provided with a threaded barrel 20, the internal thread of the threaded barrel 20 is connected with a mounting barrel 26, one end of the mounting barrel 26 is fixedly connected with a return pipe 21, the return pipe 21 is provided with a second fan 22, the return pipe 21 is fixedly connected with the air supply pipe 13, a mounting groove 27 is provided inside the mounting barrel 26, a filter ring 28 is slidably provided inside the mounting groove 27, a filter screen 29 is fixed inside the filter ring 28, two limit bars 30 are fixed on the inner wall surface of the mounting groove 27, two limit grooves 31 are provided on the surface of the filter ring 28, the limit bars 30 and the limit grooves 31 are slidably arranged, a fixing hole 32 is provided at one end of the threaded barrel 20, a sealing ring 33 is fixed at one end of the threaded barrel 20, the sealing ring 33 is fixedly inserted in the fixing hole 32, two extrusion columns 34 are fixed on one side of the sealing ring 33, and the sealing ring 33 has an interference fit with the circulation pipe 19.

[0032] During use, the air in the furnace will be drawn into the interior of the circulation pipe 19 when the second fan 22 is working, and enter the interior of the threaded cylinder 20 and the mounting cylinder 26 along the circulation pipe 19, and finally flow back to the interior of the gas supply pipe 13 through the return pipe 21. When the gas in the furnace enters the interior of the mounting cylinder 26, the gas will pass through the filter 29, and the smoke and dust in the gas can be filtered and purified, thereby improving the environment of the workshop. When the filter 29 has been used for too long, the staff will rotate the threaded cylinder 20, that is, remove the threaded cylinder 20 from the mounting cylinder 26, and then remove the filter ring 28 from the mounting cylinder 26 and replace it with a new filter ring 28 and filter 29, thereby increasing the convenience of the staff in replacing the filter 29.

[0033] like Figure 2 and Figure 4 As shown, a cover plate 23 is rotatably provided on the top surface of the air supply box 12, and a plurality of hinges are provided on one side of the air supply box 12. The air supply box 12 and the cover plate 23 are rotatably provided by the hinges. A bottom plate 24 is fixed to the bottom surface of the cover plate 23, and an elastic plate 25 is fixed to the bottom surface of the bottom plate 24. The elastic plate 25 and the air supply box 12 are interference fit. Support columns 35 are respectively fixed at the four corners of the bottom surface of the outer wall 1 of the furnace body, and a stabilizing plate 36 is fixed to the bottom end of the support column 35.

[0034] During use, after dry ice is put into the air supply box 12, the staff will buckle the cover plate 23 on the top surface of the air supply box 12, so that the elastic plate 25 is interference fit into the interior of the air supply box 12, and the top surface of the air supply box 12 is fit with the bottom surface of the bottom plate 24, so as to increase the sealing between the air supply box 12 and the cover plate 23, and prevent the leakage of carbon dioxide inside the air supply box 12. When the heat treatment furnace is placed on the ground, the heat treatment furnace will be supported upward by the support column 35 and the stabilizing plate 36 will be used to increase the contact area between the support column 35 and the ground, thereby increasing the friction between the stabilizing plate 36 and the ground, thereby increasing the stability of the heat treatment furnace on the ground.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-oxidation continuous heat treatment furnace, comprising an outer wall (1) of a furnace body, characterized in that: A furnace top (2) is fixed to the top surface of the outer wall (1) of the furnace body, a plurality of electric heaters (3) are arranged on the inner bottom surface of the outer wall (1), inlets and outlets (5) are provided on both sides of the outer wall (1), a conveyor belt (4) is arranged inside the outer wall (1), the two ends of the conveyor belt (4) are respectively close to the two inlets and outlets (5), a baffle (7) is rotatably arranged inside the inlet and outlet (5), the two sides of the baffle (7) are respectively hinged to the inner sides of the inlet and outlet (5), a fitting groove (6) is arranged on the inner bottom surface of the inlet and outlet (5), the fitting groove (6) is fitted with the bottom end of the baffle (7), a heat-saturating net (8) is arranged inside the outer wall (1), and the heat-saturating net (8) is located above the electric heater (3).

2. The anti-oxidation continuous heat treatment furnace according to claim 1, characterized in that: A furnace body (9) is arranged inside the outer wall (1) of the furnace body, a heat-resistant thermal insulation layer (10) is arranged inside the furnace body (9), and a glass fiber layer (11) is arranged inside the heat-resistant thermal insulation layer (10).

3. The anti-oxidation continuous heat treatment furnace according to claim 1, characterized in that: An air supply box (12) is provided on one side of the outer wall (1) of the furnace body, an air supply pipe (13) is fixedly inserted on one side of the air supply box (12), a first fan (14) is fixed to one end of the air supply pipe (13), a connecting pipe (15) is fixed to one end of the air outlet pipe of the first fan (14), and a supporting arc plate (16) is fixed to one side of the inner side of the outer wall (1) of the furnace body, and the supporting arc plate (16) supports one end of the connecting pipe (15) upwards.

4. The anti-oxidation continuous heat treatment furnace according to claim 3, characterized in that: A plurality of flow diversion holes (17) are provided on the surface of the connecting pipe (15), and a flow diversion pipe (18) is fixedly inserted inside the flow diversion hole (17).

5. The anti-oxidation continuous heat treatment furnace according to claim 1, characterized in that: The top surface of the furnace top (2) is fixedly connected to a circulation pipe (19), one end of the circulation pipe (19) is detachably provided with a threaded tube (20), the internal thread of the threaded tube (20) is connected to a mounting tube (26), one end of the mounting tube (26) is fixedly connected to a return pipe (21), the return pipe (21) is provided with a second fan (22), the return pipe (21) is fixedly connected to the air supply pipe (13), a mounting groove (27) is provided inside the mounting tube (26), a filter ring (28) is slidably provided inside the mounting groove (27), and a filter net (29) is fixed inside the filter ring (28).

6. The anti-oxidation continuous heat treatment furnace according to claim 5, characterized in that: Two limiting strips (30) are fixed on the inner wall surface of the installation groove (27), and two limiting grooves (31) are provided on the surface of the filter ring (28). The limiting strips (30) and the limiting grooves (31) are slidably arranged. A fixing hole (32) is provided at one end of the inner part of the threaded tube (20). A sealing ring (33) is fixed at one end of the inner part of the threaded tube (20). The sealing ring (33) is fixedly inserted in the fixing hole (32), and two extrusion columns (34) are fixed on one side of the sealing ring (33). The sealing ring (33) is interference fit with the circulation pipe (19).

7. The anti-oxidation continuous heat treatment furnace according to claim 3, characterized in that: A cover plate (23) is rotatably provided on the top surface of the air supply box (12), and a plurality of hinges are provided on one side of the air supply box (12). The air supply box (12) and the cover plate (23) are rotatably provided via the hinges. A bottom plate (24) is fixed to the bottom surface of the cover plate (23), and an elastic plate (25) is fixed to the bottom surface of the bottom plate (24). The elastic plate (25) is interference fit with the air supply box (12).

8. The anti-oxidation continuous heat treatment furnace according to claim 1, characterized in that: Support columns (35) are respectively fixed at the four corners of the bottom surface of the outer wall (1) of the furnace body, and a stabilizing plate (36) is fixed at the bottom end of the support column (35).

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