Box-type quenching and tempering furnace for heat treatment

Abstract

The invention discloses a box-type hardening and tempering furnace for heat treatment, and relates to the field of heat treatment, the box-type hardening and tempering furnace comprises a supporting table, the top of the supporting table is fixedly connected with a hardening and tempering furnace box shell, the front face of the hardening and tempering furnace box shell is rotatably connected with a first rotating door, and the inner wall of the hardening and tempering furnace box shell is fixedly connected with a first heating device; the first heating device is located at the bottom of the hardening and tempering furnace box shell, a control panel is fixedly connected to the side, close to the first rotating door, of the hardening and tempering furnace box shell, a hot air circulation unit is fixedly connected to the outer surface of the hardening and tempering furnace box shell, and a protective gas unit is fixedly connected to the side, away from the hot air circulation unit, of the hardening and tempering furnace box shell. A post-treatment unit is fixedly connected to the back face of the hardening and tempering furnace box shell, a heat treatment unit is fixedly connected to the inner wall of the hardening and tempering furnace box shell, the hot air circulation unit can increase air circulation of the hardening and tempering furnace box shell, the shielding gas unit can transmit inert gas, and finally after heat treatment, the post-treatment unit can wash metal plate parts.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, in particular to a box-type tempering furnace for heat treatment. Background Art

[0002] As a key equipment in the heat treatment process, the tempering furnace plays an indispensable role in industrial production. It is a professional equipment for tempering various metal parts. It is mainly composed of furnace body, heating system, temperature control system, ventilation system and furnace door. The furnace body is made of high-quality insulation materials, which can effectively reduce heat loss and ensure the stability of the temperature in the furnace.

[0003] During the heat treatment process of parts, the temperature in the furnace will be different, which will cause temperature differences in different parts of the parts, resulting in inconsistent properties such as hardness and metallographic structure, affecting product quality. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention adopts the following technical solution to solve the technical problems: a box-type tempering furnace for heat treatment described in the present invention comprises a support platform, a tempering furnace box shell is fixedly connected to the top of the support platform, a revolving door 1 is rotatably connected to the front of the tempering furnace box shell, a heating device 1 is fixedly connected to the inner wall of the tempering furnace box shell, the heating device 1 is located at the bottom of the tempering furnace box shell, a control panel is fixedly connected to the side of the tempering furnace box shell close to the revolving door 1, a hot air circulation unit is fixedly connected to the outer surface of the tempering furnace box shell, a protective gas unit is fixedly connected to the side of the tempering furnace box shell away from the hot air circulation unit, a post-processing unit is fixedly connected to the back of the tempering furnace box shell, and a heat treatment unit is fixedly connected to the inner wall of the tempering furnace box shell; The hot air circulation unit includes a circular tube, one end of the circular tube away from the tempering furnace box shell is fixedly connected to a processing shell, the side of the processing shell away from the circular tube is fixedly connected to an isolation plate, the outer surface of the processing shell is fixedly connected to a liquid guide port, the inner wall of the processing shell is fixedly connected to an inner partition, the top of the inner partition is fixedly connected to a servo motor 1, the output end of the servo motor 1 is fixedly connected to a rotating shaft 1, the outer surface of the rotating shaft 1 is fixedly connected to fan blades, the bottom of the inner partition is fixedly connected to an exhaust device 1, the outer surface of the exhaust device 1 is fixedly connected to an air inlet pipe, the bottom of the exhaust device 1 is fixedly connected to an air outlet pipe, and an alkaline solution of sodium dithionite is placed in the processing shell.

[0005] Preferably, one end of the circular tube is fixedly connected to the outer surface of the tempering furnace box shell, the air inlet pipe is located above the page of the sodium dithionite alkaline solution, and the air outlet pipe is located below the page of the sodium dithionite alkaline solution.

[0006] Preferably, the heat treatment unit includes a transmission mechanism, the outer surface of the transmission mechanism is fixedly connected to a support plate 1, the inner wall of the support plate 1 is symmetrically provided with telescopic rods, the output end of the telescopic rod is fixedly connected to a placement mechanism, the inner wall of the tempering furnace box shell is fixedly connected to a rack, the outer surface of the support plate 1 is fixedly connected to an air pipe 1, the end of the support plate 1 close to the air pipe 1 is fixedly connected to a winding rod, and the outer surface of the support plate 1 is fixedly connected to an air outlet device.

[0007] Preferably, the transmission mechanism includes an outer frame, the inner wall of the outer frame is fixedly connected to servo motor 2, the output end of servo motor 2 is fixedly connected to a screw rod, the outer surface of the screw rod is threadedly connected to a moving block, the outer surface of the moving block is rotatably connected to a rotating rod, and the end of the rotating rod away from the moving block is fixedly connected to a gear.

[0008] Preferably, the placement mechanism includes a placement plate, an outer surface of the placement plate is provided with a vent hole, side plates are symmetrically provided at both ends of the placement plate, the outer surface of the side plate is fixedly connected to a telescopic spring, one end of the telescopic spring is fixedly connected to a limiting plate, the inner wall of the placement plate is fixedly connected to a placement groove, the outer surface of the placement plate is slidably connected to the outer surface of the placement groove, the inner wall of the placement plate is symmetrically provided with sliding rods, the end of the sliding rod close to the telescopic spring is fixedly connected to a baffle, the outer surface of the sliding rod is fixedly connected to a movable plate, the bottom of the movable plate is fixedly connected to a rubber scraper plate, the outer surface of the air outlet device is fixedly connected to air pipe 2, and the end of air pipe 2 away from the air outlet device is fixedly connected to an air outlet.

[0009] Preferably, the outer surface of the outer frame is fixedly connected to the inner wall of the tempering furnace box shell, the outer surface of the placement plate is fixedly connected to the output end of the telescopic rod, and the outer surface of the air outlet is fixedly connected to the inner wall of the placement plate.

[0010] Preferably, the protective gas unit comprises an outer box, the bottom of the outer box is evenly provided with access ports, the top of the access port is fixedly connected to the bottom of the outer box, the bottom of the access port is provided with an inert gas pipe, the bottom of the inner wall of the outer box is fixedly connected with an outlet port, the inner wall of the outer box is fixedly connected with a second heating device, the outer surface of the second heating device is fixedly connected with a heating column, and the side of the outer box close to the tempering furnace shell is fixedly connected with a second exhaust device.

[0011] Preferably, one end of the air pipe 1 away from the support plate 1 is fixedly connected to the outer surface of the exhaust device 2, and the outer surface of the outer box is fixedly connected to the outer surface of the tempering furnace box shell.

[0012] Preferably, the post-processing unit includes a processing box, a side of the processing box is fixedly connected to a pumping device, an outer surface of the pumping device is fixedly connected to a water pipe, a side of the pumping device away from the water pipe is fixedly connected to a top plate, high-pressure nozzles are evenly arranged on the bottom of the top plate, the top of the high-pressure nozzles is fixedly connected to the bottom of the top plate, a side of the processing box close to the tempering furnace box shell is fixedly connected to a thermal insulation curtain, and a side of the processing box away from the tempering furnace box shell is rotatably connected to a revolving door 2.

[0013] Preferably, the outer surface of the processing box is fixedly connected to the outer surface of the tempering furnace box shell.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention sets a hot air circulation unit, and the servo motor drives the rotating shaft and the fan blades to rotate, thereby absorbing the outside air into the tempering furnace box shell, so that the hot air is forced to circulate in the tempering furnace box shell, promoting heat transfer and reducing temperature gradient.

[0015] 2. The present invention sets a hot air circulation unit, and the exhaust device sucks air through the air inlet pipe and flows out through the air outlet pipe below the sodium dithionite alkaline solution page. The outflowing air will react chemically with the sodium dithionite alkaline solution to reduce oxygen, thereby achieving the purpose of removing oxygen in the air. At the same time, the gas will leave dust impurities in the liquid after passing through the liquid, and these dusts will not enter the tempering furnace box shell and adhere to the parts.

[0016] 3. The present invention sets a transmission mechanism, and the mutual meshing of the gear and the rack causes the rotating rod to rotate, thereby causing the placement mechanism and the metal plate parts to rotate, so that the metal plate parts are more in contact with the hot air in the tempering furnace shell, thereby achieving a better heat treatment effect. Since the heating device is located at the bottom of the tempering furnace shell, a large temperature difference between the top and bottom of the metal plate parts is avoided.

[0017] 4. The present invention sets a placement mechanism. During the rotation of the placement plate, the elastic force of the telescopic spring will fix the metal plate parts. At the same time, as the placement plate rotates, the movable plate will slide along the sliding rod, thereby driving the rubber scraping plate to scratch the fragile oxide scale and dust impurities on the surface of the metal plate parts. At the same time, the protective gas unit will introduce inert gas and blow the surface of the metal plate parts through the air pipe 2 and the air outlet, so that a small amount of oxygen cannot produce an oxidation reaction with the parts, thereby minimizing the generation of oxide scale.

[0018] 5. The present invention sets a post-processing unit. After the heat treatment, the telescopic rod will push the overall placement mechanism into the processing box. Then the pumping device will transfer the extracted cooling water to the top plate and spray it out from the high-pressure nozzle to rinse the overall metal plate parts and the rubber scraper, so that the dust and impurities attached to the rubber scraper are washed off. At the same time, the flushing of water will quickly cool down the metal plate parts. Through rapid cooling, the austenite structure in the steel will be transformed into the martensite structure. Martensite has the characteristics of high hardness and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural cross-sectional view of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the hot air circulation unit of the present invention.

[0022] Figure 4 It is a structural sectional view of the hot air circulation unit of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the heat treatment unit of the present invention.

[0024] Figure 6 It is a structural schematic diagram of the transmission mechanism of the present invention.

[0025] Figure 7 It is a structural schematic diagram of the placement mechanism of the present invention.

[0026] Figure 8 yes Figure 7 Enlarged view of point A in the middle.

[0027] Fig. 9 It is a partial structural schematic diagram of the placement mechanism of the present invention.

[0028] Fig.10 It is a schematic structural diagram of the protective gas unit of the present invention.

[0029] Fig.11 It is a structural schematic diagram of the post-processing unit of the present invention.

[0030] In the figure: 1. support table; 2. tempering furnace box shell; 3. revolving door 1; 4. heating device 1; 5. control panel; 6. hot air circulation unit; 61. round tube; 62. processing shell; 63. isolation plate; 64. liquid guide port; 65. inner partition; 66. servo motor 1; 67. rotating shaft 1; 68. fan blade; 69. exhaust device 1; 610. air inlet pipe; 611. air outlet pipe; 7. protective gas unit; 71. outer box; 72. access port; 73. inert gas pipe; 74. air outlet port; 75. heating device 2; 76. heating column; 77. exhaust device 2; 8. heat treatment unit; 81. transmission mechanism; 811. servo motor 2; 812. screw rod; 813. outer frame ;814, moving block;815, rotating rod;816, gear;82, support plate one;83, placement mechanism;831, placement plate;832, vent;833, side plate;834, telescopic spring;835, limit plate;836, placement slot;837, sliding rod;838, baffle;839, moving plate;8310, rubber scraper;8311, air outlet;8312, air pipe two;84, rack;85, air pipe one;86, winding rod;87, air outlet device;88, telescopic rod;9, post-processing unit;91, processing box;92, pumping device;93, water pipe;94, top plate;95, high-pressure nozzle;96, thermal insulation curtain;97, revolving door two. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0032] Example 1, using Figure 1-Figure 11 A box-type tempering furnace for heat treatment according to one embodiment of the present invention is described below.

[0033] like Figure 1-Figure 2As shown, a box-type tempering furnace for heat treatment of the present invention comprises a support platform 1, a tempering furnace box shell 2 is fixedly connected to the top of the support platform 1, a revolving door 3 is rotatably connected to the front of the tempering furnace box shell 2, a heating device 4 is fixedly connected to the inner wall of the tempering furnace box shell 2, the heating device 4 is located at the bottom of the tempering furnace box shell 2, a control panel 5 is fixedly connected to the side of the tempering furnace box shell 2 close to the revolving door 3, a hot air circulation unit 6 is fixedly connected to the outer surface of the tempering furnace box shell 2, a protective gas unit 7 is fixedly connected to the side of the tempering furnace box shell 2 away from the hot air circulation unit 6, a post-processing unit 9 is fixedly connected to the back of the tempering furnace box shell 2, and a heat treatment unit 8 is fixedly connected to the inner wall of the tempering furnace box shell 2; When the present invention is working, first, the metal plate parts that need heat treatment need to be placed in the heat treatment unit 8, and then the heating device 4 will heat the air in the tempering furnace box shell 2, the hot air circulation unit 6 will increase the air circulation of the tempering furnace box shell 2, and the protective gas unit 7 will transmit inert gas. Finally, after the heat treatment, the post-treatment unit 9 will flush the metal plate parts.

[0034] like Figure 3-Figure 4 As shown, the hot air circulation unit 6 includes a circular tube 61, one end of the circular tube 61 away from the tempering furnace box shell 2 is fixedly connected to a processing shell 62, the side of the processing shell 62 away from the circular tube 61 is fixedly connected to an isolation plate 63, the outer surface of the processing shell 62 is fixedly connected to a liquid guide port 64, the inner wall of the processing shell 62 is fixedly connected to an inner partition 65, the top of the inner partition 65 is fixedly connected to a servo motor 66, the output end of the servo motor 66 is fixedly connected to a rotating shaft 67, the outer surface of the rotating shaft 67 is fixedly connected to a fan blade 68, the bottom of the inner partition 65 is fixedly connected to an exhaust device 69, the outer surface of the exhaust device 69 is fixedly connected to an air inlet pipe 610, the bottom of the exhaust device 69 is fixedly connected to an air outlet pipe 611, and an alkaline solution of sodium dithionite is placed in the processing shell 62.

[0035] When heat treating the metal parts, the temperature of each part in the tempering furnace box shell 2 is different, so that the temperature of different parts of the parts is different, resulting in inconsistent hardness, metallographic structure and other properties, affecting product quality. The servo motor will drive the shaft 67 and the fan blade 68 to rotate, thereby absorbing the outside air into the tempering furnace box shell 2, so that the hot air is forced to circulate in the tempering furnace box shell 2, promoting heat transfer and reducing temperature gradients. However, during the high-temperature heating process, the surface of the part reacts chemically with oxygen to form an oxide scale, and the carbon element The elements escape from the surface of the parts, resulting in a decrease in the surface hardness, affecting the wear resistance and fatigue strength of the parts. Therefore, when the outside air is introduced, the exhaust device 69 will inhale air through the air inlet pipe 610 and flow out through the air outlet pipe 611 below the sodium dithionite alkaline solution page. The outflowing air will react chemically with the sodium dithionite alkaline solution to reduce the oxygen, thereby achieving the purpose of removing oxygen from the air. At the same time, the gas will leave dust impurities in the liquid after passing through the liquid, and these dust will not enter the tempering furnace box shell 2 and adhere to the parts.

[0036] One end of the circular tube 61 is fixedly connected to the outer surface of the tempering furnace shell 2, the air inlet pipe 610 is located above the surface of the sodium dithionite alkaline solution, and the air outlet pipe 611 is located below the surface of the sodium dithionite alkaline solution.

[0037] The specific workflow is as follows: During operation, after the metal plate parts are placed into the heat treatment unit 8, the heating device 4 will start to work to increase the temperature of the tempering furnace box shell 2. At the same time, the servo motor will drive the rotating shaft 67 and the fan blades 68 to rotate, thereby absorbing the outside air into the tempering furnace box shell 2, so that the hot air is forced to circulate in the inner tempering furnace box shell 2, promoting heat transfer and reducing the temperature gradient. However, during the high-temperature heating process, the surface of the parts reacts chemically with oxygen to form an oxide scale. When the outside air is introduced, the exhaust device 69 will inhale air through the air inlet pipe 610 and flow out through the air outlet pipe 611 below the sodium dithionite alkaline solution page. The outflowing air will react chemically with the sodium dithionite alkaline solution to reduce the oxygen, thereby achieving the purpose of removing oxygen from the air. At the same time, the gas will leave dust impurities in the liquid after passing through the liquid.

[0038] Example 2, using Figure 1-Figure 11 A box-type tempering furnace for heat treatment according to one embodiment of the present invention is described below.

[0039] like Figure 5As shown, a box-type tempering furnace for heat treatment of the present invention is based on the first embodiment, and the heat treatment unit 8 includes a transmission mechanism 81, the outer surface of the transmission mechanism 81 is fixedly connected to a support plate 82, the inner wall of the support plate 82 is symmetrically provided with telescopic rods 88, the output end of the telescopic rod 88 is fixedly connected to a placement mechanism 83, the inner wall of the tempering furnace box shell 2 is fixedly connected to a rack 84, the outer surface of the support plate 82 is fixedly connected to an air pipe 85, the end of the support plate 82 close to the air pipe 85 is fixedly connected to a winding rod 86, and the outer surface of the support plate 82 is fixedly connected to an exhaust device 87.

[0040] The gas in the protective gas unit 7 will enter the support plate 82 through the gas pipe 85 and then enter the gas outlet device 87.

[0041] like Figure 6 As shown, the transmission mechanism 81 includes an outer frame 813, the inner wall of the outer frame 813 is fixedly connected to a servo motor 811, the output end of the servo motor 811 is fixedly connected to a screw rod 812, the outer surface of the screw rod 812 is threadedly connected to a moving block 814, the outer surface of the moving block 814 is rotatably connected to a rotating rod 815, and the end of the rotating rod 815 away from the moving block 814 is fixedly connected to a gear 816.

[0042] After the metal part plate is placed in the placement mechanism 83, the servo motor 811 will drive the screw 812 to rotate, and then the moving block 814 will move. As the moving block 814 moves, the rotating rod 815 will be driven to move. The mutual engagement of the gear 816 and the rack 84 will cause the rotating rod 815 to rotate, and then the placement mechanism 83 and the metal plate part will rotate, so that the metal plate part will have more contact with the hot air in the tempering furnace box shell 2, so as to achieve a better heat treatment effect. Since the heating device is at the bottom of the tempering furnace box shell 2, a large temperature difference between the top and bottom of the metal plate part is avoided.

[0043] like Figure 7-Figure 9As shown, the placement mechanism 83 includes a placement plate 831, the outer surface of the placement plate 831 is provided with a vent hole 832, side plates 833 are symmetrically provided at both ends of the placement plate 831, the outer surface of the side plate 833 is fixedly connected with a telescopic spring 834, one end of the telescopic spring 834 is fixedly connected with a limiting plate 835, the inner wall of the placement plate 831 is fixedly connected with a placement groove 836, the outer surface of the placement plate 831 is slidably connected with the outer surface of the placement groove 836, the inner wall of the placement plate 831 is symmetrically provided with sliding rods 837, the end of the sliding rod 837 close to the telescopic spring 834 is fixedly connected with a baffle 838, the outer surface of the sliding rod 837 is fixedly connected with a moving plate 839, the bottom of the moving plate 839 is fixedly connected with a rubber scraper plate 8310, the outer surface of the air outlet device 87 is fixedly connected with an air pipe 8312, and the end of the air pipe 8312 away from the air outlet device 87 is fixedly connected with an air outlet 8311.

[0044] Since there is still a certain amount of air in the tempering furnace box shell 2, the dust in the air will still be attached to the metal plate parts and even oxide scale will be produced during the heat treatment process. The metal plate parts will be placed in the placement groove 836 of the placement plate 831. During the rotation of the placement plate 831, the elastic force of the telescopic spring 834 will fix the metal plate parts. At the same time, as the placement plate 831 rotates, the movable plate 839 will slide along the sliding rod 837, thereby driving the rubber scraping plate 8310 to scratch the fragile oxide scale and dust impurities on the surface of the metal plate parts. At the same time, the protective gas unit 7 will introduce inert gas and blow the surface of the metal plate parts through the air pipe 8312 and the air outlet 8311, so that a small amount of oxygen cannot produce an oxidation reaction with the parts, thereby minimizing the production of oxide scale.

[0045] The outer surface of the outer frame 813 is fixedly connected to the inner wall of the tempering furnace box shell 2 , the outer surface of the placement plate 831 is fixedly connected to the output end of the telescopic rod 88 , and the outer surface of the air outlet 8311 is fixedly connected to the inner wall of the placement plate 831 .

[0046] like Fig.10 As shown, the protective gas unit 7 includes an outer box 71, the bottom of the outer box 71 is evenly provided with access ports 72, the top of the access port 72 is fixedly connected to the bottom of the outer box 71, the bottom of the access port 72 is provided with an inert gas pipe 73, the bottom of the inner wall of the outer box 71 is fixedly connected with an outlet port 74, the inner wall of the outer box 71 is fixedly connected with a heating device 2 75, the outer surface of the heating device 2 75 is fixedly connected with a heating column 76, and the side of the outer box 71 close to the tempering furnace box shell 2 is fixedly connected with an exhaust device 2 77.

[0047] The second heating device 75 heats the inert gas through the heating column 76 and transmits it to the gas pipe 1 85 through the second exhaust device 77 .

[0048] One end of the air pipe 85 away from the support plate 82 is fixedly connected to the outer surface of the exhaust device 77 , and the outer surface of the outer box 71 is fixedly connected to the outer surface of the tempering furnace box shell 2 .

[0049] like Fig.11 As shown, the post-processing unit 9 includes a processing box 91, a pumping device 92 is fixedly connected to the side of the processing box 91, a water pipe 93 is fixedly connected to the outer surface of the pumping device 92, a top plate 94 is fixedly connected to the side of the pumping device 92 away from the water pipe 93, high-pressure nozzles 95 are evenly arranged on the bottom of the top plate 94, the top of the high-pressure nozzle 95 is fixedly connected to the bottom of the top plate 94, a thermal insulation curtain 96 is fixedly connected to the side of the processing box 91 close to the tempering furnace box shell 2, and a revolving door 2 97 is rotatably connected to the side of the processing box 91 away from the tempering furnace box shell 2.

[0050] After the heat treatment, the telescopic rod 88 will push the overall placement mechanism 83 into the processing box 91, and then the pumping device 92 will transfer the extracted cooling water to the top plate 94 and spray it out from the high-pressure nozzle 95 to rinse the overall metal plate parts and the rubber scraper, so that the dust and impurities attached to the rubber scraper are washed off. At the same time, the flushing of water will cause the metal plate parts to cool down rapidly. Through rapid cooling, the austenite structure in the steel will be transformed into the martensite structure. Martensite has the characteristics of high hardness and high strength.

[0051] The outer surface of the processing box 91 is fixedly connected to the outer surface of the tempering furnace box shell 2.

[0052] The specific workflow is as follows: During operation, the servo motor 811 drives the screw 812 to rotate, thereby moving the moving block 814. As the moving block 814 moves, the rotating rod 815 is driven to move. The mutual engagement of the gear 816 and the rack 84 causes the rotating rod 815 to rotate, thereby causing the placement mechanism 83 and the metal plate parts to rotate. During the rotation of the placement plate 831, the elastic force of the telescopic spring 834 fixes the metal plate parts. At the same time, as the placement plate 831 rotates, the moving plate 839 slides along the sliding rod 837, thereby driving the rubber scraping plate 8310 to scratch the fragile oxide scale and dust impurities on the surface of the metal plate parts. At the same time, the protective gas unit 7 introduces inert gas and blows the surface of the metal plate parts through the air pipe 8312 and the air outlet 8311, so that a small amount of oxygen cannot produce an oxidation reaction with the parts, thereby minimizing the generation of oxide scale.

[0053] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A box-type tempering furnace for heat treatment, comprising a support table (1), characterized in that: The top of the support platform (1) is fixedly connected to a tempering furnace box shell (2); the front of the tempering furnace box shell (2) is rotatably connected to a revolving door (3); the inner wall of the tempering furnace box shell (2) is fixedly connected to a heating device (4); the heating device (4) is located at the bottom of the tempering furnace box shell (2); a control panel (5) is fixedly connected to a side of the tempering furnace box shell (2) close to the revolving door (3); a hot air circulation unit (6) is fixedly connected to the outer surface of the tempering furnace box shell (2); a protective gas unit (7) is fixedly connected to a side of the tempering furnace box shell (2) away from the hot air circulation unit (6); a post-processing unit (9) is fixedly connected to the back of the tempering furnace box shell (2); and a heat treatment unit (8) is fixedly connected to the inner wall of the tempering furnace box shell (2); The hot air circulation unit (6) comprises a circular tube (61), one end of the circular tube (61) away from the tempering furnace box shell (2) is fixedly connected to a processing shell (62), a side of the processing shell (62) away from the circular tube (61) is fixedly connected to an isolation plate (63), an outer surface of the processing shell (62) is fixedly connected to a liquid guide port (64), an inner wall of the processing shell (62) is fixedly connected to an inner partition (65), and a top of the inner partition (65) is fixedly connected to a servo motor (61). 66), the output end of the servo motor 1 (66) is fixedly connected to a rotating shaft 1 (67), the outer surface of the rotating shaft 1 (67) is fixedly connected to a fan blade (68), the bottom of the inner partition (65) is fixedly connected to an exhaust device 1 (69), the outer surface of the exhaust device 1 (69) is fixedly connected to an air inlet pipe (610), the bottom of the exhaust device 1 (69) is fixedly connected to an air outlet pipe (611), and an alkaline solution of sodium dithionite is placed in the processing shell (62).

2. The box-type tempering furnace for heat treatment according to claim 1, characterized in that: One end of the circular tube (61) is fixedly connected to the outer surface of the tempering furnace box shell (2); the air inlet pipe (610) is located above the surface of the sodium dithionite alkaline solution; and the air outlet pipe (611) is located below the surface of the sodium dithionite alkaline solution.

3. The box-type tempering furnace for heat treatment according to claim 1, characterized in that: The heat treatment unit (8) comprises a transmission mechanism (81), the outer surface of the transmission mechanism (81) is fixedly connected to a support plate 1 (82), the inner wall of the support plate 1 (82) is symmetrically provided with telescopic rods (88), the output end of the telescopic rod (88) is fixedly connected to a placement mechanism (83), the inner wall of the tempering furnace box shell (2) is fixedly connected to a rack (84), the outer surface of the support plate 1 (82) is fixedly connected to an air pipe 1 (85), one end of the support plate 1 (82) close to the air pipe 1 (85) is fixedly connected to a winding rod (86), and the outer surface of the support plate 1 (82) is fixedly connected to an air outlet device (87).

4. The box-type tempering furnace for heat treatment according to claim 3, characterized in that: The transmission mechanism (81) comprises an outer frame (813), the inner wall of the outer frame (813) is fixedly connected to a servo motor 2 (811), the output end of the servo motor 2 (811) is fixedly connected to a lead screw (812), the outer surface of the lead screw (812) is threadedly connected to a moving block (814), the outer surface of the moving block (814) is rotatably connected to a rotating rod (815), and one end of the rotating rod (815) away from the moving block (814) is fixedly connected to a gear (816).

5. The box-type tempering furnace for heat treatment according to claim 4, characterized in that: The placement mechanism (83) comprises a placement plate (831), the outer surface of the placement plate (831) is provided with a vent hole (832), side plates (833) are symmetrically provided at both ends of the placement plate (831), the outer surface of the side plate (833) is fixedly connected to a telescopic spring (834), one end of the telescopic spring (834) is fixedly connected to a limit plate (835), the inner wall of the placement plate (831) is fixedly connected to a placement groove (836), and the outer surface of the placement plate (831) is slidably connected to the outer surface of the placement groove (836). The inner wall of the placement plate (831) is symmetrically provided with sliding rods (837), one end of the sliding rod (837) close to the telescopic spring (834) is fixedly connected to a baffle (838), the outer surface of the sliding rod (837) is fixedly connected to a movable plate (839), the bottom of the movable plate (839) is fixedly connected to a rubber scraper plate (8310), the outer surface of the air outlet device (87) is fixedly connected to an air pipe 2 (8312), and the end of the air pipe 2 (8312) away from the air outlet device (87) is fixedly connected to an air outlet (8311).

6. The box-type tempering furnace for heat treatment according to claim 5, characterized in that: The outer surface of the outer frame (813) is fixedly connected to the inner wall of the tempering furnace box shell (2), the outer surface of the placement plate (831) is fixedly connected to the output end of the telescopic rod (88), and the outer surface of the air outlet (8311) is fixedly connected to the inner wall of the placement plate (831).

7. The box-type tempering furnace for heat treatment according to claim 3, characterized in that: The protective gas unit (7) comprises an outer box (71), the bottom of the outer box (71) is evenly provided with access ports (72), the top of the access port (72) is fixedly connected to the bottom of the outer box (71), the bottom of the access port (72) is provided with an inert gas pipe (73), the bottom of the inner wall of the outer box (71) is fixedly connected to a gas outlet port (74), the inner wall of the outer box (71) is fixedly connected to a second heating device (75), the outer surface of the second heating device (75) is fixedly connected to a heating column (76), and a side of the outer box (71) close to the tempering furnace box shell (2) is fixedly connected to a second exhaust device (77).

8. The box-type tempering furnace for heat treatment according to claim 7, characterized in that: One end of the gas pipe 1 (85) away from the support plate 1 (82) is fixedly connected to the outer surface of the second exhaust device (77), and the outer surface of the outer box (71) is fixedly connected to the outer surface of the tempering furnace box shell (2).

9. The box-type tempering furnace for heat treatment according to claim 1, characterized in that: The post-processing unit (9) comprises a processing box (91), a side of the processing box (91) is fixedly connected to a pumping device (92), an outer surface of the pumping device (92) is fixedly connected to a water pipe (93), a side of the pumping device (92) away from the water pipe (93) is fixedly connected to a top plate (94), a bottom of the top plate (94) is evenly provided with high-pressure nozzles (95), the top of the high-pressure nozzles (95) is fixedly connected to the bottom of the top plate (94), a side of the processing box (91) close to the tempering furnace box shell (2) is fixedly connected to a thermal insulation curtain (96), and a side of the processing box (91) away from the tempering furnace box shell (2) is rotatably connected to a second revolving door (97).

10. The box-type tempering furnace for heat treatment according to claim 9, characterized in that: The outer surface of the processing box (91) is fixedly connected to the outer surface of the tempering furnace box shell (2).

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