A muffle tank structure for carburizing furnace and its process

Abstract

The present invention discloses a muffle structure for a carburizing furnace and a process thereof, relating to the field of muffle structures. The present invention comprises a carburizing furnace body, a gas introduction assembly disposed within the carburizing furnace body, a cooling sealing assembly, and a top sealing assembly. The central cavity of the carburizing furnace body forms a furnace chamber and a sealed chamber, respectively, with the furnace chamber located above the sealed chamber. A muffle is disposed within the furnace chamber, and a furnace table is disposed below the muffle. The gas introduction assembly is in communication with the furnace chamber and the sealed chamber, respectively. The cooling sealing assembly is disposed within the sealed chamber, and the top sealing assembly is disposed on the muffle. By controlling a three-way valve, a gas source is connected to the sealed chamber, and cooling water in the sealed chamber is squeezed into the muffle, forming a bottom sealing structure of a sealing ring, cooling water, and gas. This improves sealing quality, effectively blocks heat loss between the muffle and the furnace table, and enhances the efficiency and quality of heat treatment.

Description

Technical Field

[0001] The invention relates to the field of muffle tank structures, in particular to a muffle tank structure for a carburizing furnace and a process thereof. Background Art

[0002] Carburizing is a type of metal surface treatment. Carburizing is mostly used for low-carbon steel or low-alloy steel. The specific method is to place the workpiece in an active carburizing medium, heat it to a single-phase austenite zone of 900-950 degrees Celsius, and keep it warm for a sufficient time so that the activated carbon atoms decomposed in the carburizing medium penetrate into the surface of the steel part, thereby obtaining high carbon on the surface while the core still retains the original composition.

[0003] The muffle tank is a combustion device that completely encloses the heat transfer process of fuel and combustion products into the furnace within the "muffle tube".

[0004] During the operation of the muffle tank in the carburizing furnace, there are the following problems:

[0005] In the carburizing furnace, the lower part of the side wall of the furnace support and the annular sealing groove wall form a sealing groove. However, for the sealing ring used here, long-term work will lead to low safety and reliability, low sealing quality, lack of flexibility, and difficulty in maintenance.

[0006] After the carburizing furnace is completed, the temperature of the carburizing furnace is often high, and in a well-sealed state, loading and unloading is not convenient, and a lot of heat is lost. Summary of the Invention

[0007] The purpose of the present invention is to provide a muffle tank structure for a carburizing furnace and a process thereof, and to provide a muffle tank structure which can improve the flexibility of a sealing ring, has better sealing, is convenient for loading and unloading, and improves the sealing quality.

[0008] The present invention relates to a muffle tank structure for a carburizing furnace, comprising a carburizing furnace body, a gas introduction assembly arranged inside the carburizing furnace body, a cooling sealing assembly, and a top sealing assembly;

[0009] The middle cavity of the carburizing furnace body forms a furnace and a sealed chamber respectively, and the furnace is located above the sealed chamber;

[0010] A muffle tank is arranged inside the furnace, and a furnace platform is arranged below the muffle tank.

[0011] The gas introduction assembly is communicated with the furnace and the sealed chamber respectively, the cooling sealing assembly is arranged in the sealed chamber, and the top sealing assembly is arranged on the muffle tank.

[0012] The gas introduction assembly includes an air pump, a gas input pipe, a gas output pipe and a three-way valve. The air pump is arranged on the carburizing furnace body, the gas input pipe is arranged at the input end of the air pump, and the gas output pipe is arranged at the output end of the air pump. The gas output pipe is a T-shaped pipe, and the gas output pipe is provided with two output pipe openings, one of which is connected to the furnace, and the other is connected to the sealed chamber. The three-way valve is arranged at the intersection of the gas output pipes;

[0013] Among them, the gas input pipe is connected to the gas source, and the air pump is responsible for inputting the gas from the gas source into the carburizing furnace body through the gas output pipe. The three-way valve can control the connection between the gas input pipe and the two output pipe ports respectively, and the two output pipe ports can also be connected to each other.

[0014] The cooling seal assembly includes a sealing ring, a first reset portion, a cooling water pipe and a water-cooling sealing groove, wherein the sealing ring is arranged between the muffle tank and the furnace table, the sealing ring is an annular structure, the first reset portion is arranged between the muffle tank and the sealing ring, the water-cooling sealing groove is arranged in the sealed chamber, one end of the cooling water pipe is connected to the water-cooling sealing groove, and the other end of the cooling water pipe is connected to the muffle tank;

[0015] Among them, the sealing ring is two-layered, the upper layer is made of fiber layer, and the lower layer is made of silicone rubber. The fiber layer has a high fire-resistant temperature and is made of refractory fiber into a fiber packing shape, which fills the gap between the muffle tank and the furnace table and can move in the gap.

[0016] The top sealing assembly includes a sealing ring, a second reset portion, a protrusion, a sealing door, a mounting seat, a rotating shaft and a rotating block. A plurality of second reset portions are provided on the inner wall of the furnace chamber. The sealing ring is connected to the second reset portion. The edge of the sealing ring is in close contact with the inner wall of the furnace chamber. The protrusion is provided on the sealing ring. The rotating shaft is movably provided on the muffle tank. The mounting seat is provided at the center of the rotating shaft. The sealing door is connected to the mounting seat. A rotating block is provided at each end of the rotating shaft. The rotating block is located above the protrusion.

[0017] Among them, the sealing ring seals the top of the muffle tank, the rotating shaft can rotate, and can also drive the sealing ring to rotate through the mounting seat. The corners of the rotating block close to the protrusion are rounded to better cooperate with the protrusion.

[0018] The first reset portion includes a first telescopic rod and a first reset spring. The bottom of the muffle tank is provided with a plurality of first mounting grooves. The first telescopic rod and the first reset spring are disposed in the first mounting grooves. The first reset spring is disposed around the first telescopic rod. The movable end of the first telescopic rod is connected to the sealing ring.

[0019] The movable end of the first telescopic rod will contract when subjected to force, and cooperate with the first return spring to reset the object at the movable end of the first telescopic rod.

[0020] The second reset portion includes a second telescopic rod, a second reset spring, and a connecting block. A plurality of second mounting grooves are provided on the inner wall of the furnace chamber. The second telescopic rod and the second reset spring are disposed in the second mounting grooves. The second reset spring is disposed around the second telescopic rod. The connecting block is disposed at the output end of the second telescopic rod and is connected to the sealing ring.

[0021] The working principle of the second reset part is the same as that of the first reset part.

[0022] The carburizing furnace body is provided with an exhaust pipe, the exhaust pipe is connected to the furnace, and the exhaust pipe is provided with an exhaust valve;

[0023] Among them, the exhaust pipe can discharge the gas in the furnace, and the exhaust valve controls the flow of the exhaust pipe.

[0024] A support is provided at the bottom of the furnace platform, and the furnace platform is arranged inside the carburizing furnace body through the support. A workpiece entrance is provided at the top of the carburizing furnace body, a furnace door is hingedly provided on one side of the top of the carburizing furnace body, and a control component is provided on the carburizing furnace body;

[0025] Among them, a square thin wall corresponding to the workpiece entrance is set on the furnace door. After the furnace door is closed, the square thin wall seals the workpiece entrance. The control component mainly controls the heat treatment stage of the carburizing furnace.

[0026] A process for using a muffle tank structure for a carburizing furnace comprises the following steps:

[0027] S1, put the workpiece in;

[0028] Open the furnace door and the sealing door, place the workpiece to be processed into the muffle tank, and support it above the furnace table;

[0029] S2, sealing;

[0030] Cooling water is introduced into the water-cooling sealing groove. After the cooling water enters the water-cooling sealing groove, the cooling water is introduced into the water inlet on the inner side of the muffle tank and overflows from the overflow port on the outer side of the muffle tank. The water inlet structure with natural overflow ensures that the cooling water level does not drop and is automatically maintained at a high level. In addition, the cooling water flows from the water inlet on the inner side of the muffle tank, passes downward through the lower end of the muffle tank, and then rises upward until it overflows from the overflow port on the outer side of the muffle tank.

[0031] S3, introducing gas;

[0032] Start the air pump, and connect it to the furnace through the gas output pipe and the three-way valve, and let the gas into the furnace. After a certain amount of gas is introduced, connect it to the sealed chamber and let the gas into the sealed chamber. The gas pressure will make the cooling water flow to the sealing ring in the muffle tank. The cooling water will press against the sealing ring, causing the sealing ring to move upwards and support the gap between the muffle tank and the furnace table.

[0033] S4, heat treatment;

[0034] The furnace starts to heat up and heat treat the workpiece inside the muffle tank;

[0035] S5, end;

[0036] S5.1. Cooling;

[0037] After the heat treatment of the workpiece is completed, the three-way valve is started to connect the furnace and the sealed chamber. The gas in the sealed chamber enters the furnace, and the cooling water in the muffle tank enters the water-cooled sealing groove. The sealing ring without cooling water moves downward, causing the cooling water pipe previously blocked by the sealing ring to leak out. The cooling water enters the muffle furnace from the cooling water pipe to cool the workpiece.

[0038] S5.2, remove the workpiece;

[0039] The gas in the sealed chamber enters the furnace, and the gas inside the furnace causes the sealing ring to move upward, and the protrusion presses against the rotating block, causing the rotating block to rotate. The rotation of the rotating block drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the sealing door to rotate, and the workpiece is taken out;

[0040] S5.3, exhaust gas;

[0041] After the workpiece is taken out, the exhaust valve is opened and the gas is discharged to the outside through the exhaust pipe. After the gas is discharged, the sealing ring is reset.

[0042] The present invention has the following beneficial effects:

[0043] The present invention starts an air pump, which draws gas from a gas source through a gas input pipe, and first controls a three-way valve to connect the gas source with the furnace, so that the furnace is filled with gas. The gas surrounds the muffle tank, forming a gas insulation layer for the muffle tank, preventing temperature loss and improving the quality of heat treatment of workpieces.

[0044] The present invention controls the three-way valve to connect the gas source with the sealed chamber, so that the cooling water in the sealed chamber is squeezed into the muffle tank and seals the sealing ring more tightly, thereby improving the sealing quality and forming a bottom sealing structure of the sealing ring-cooling water-gas, thereby improving the sealing quality and effectively blocking the heat loss between the muffle tank and the furnace table, thereby improving the efficiency and quality of the heat treatment.

[0045] The present invention allows cooling water to enter the water-cooled sealing groove and be squeezed by the introduced gas with a relatively high air pressure, so that the cooling water moves upward. The cooling water contacts and presses against the sealing ring, so that the sealing ring is tightly attached to the workpiece supporting platform in the muffle tank. The sealing ring also blocks the cooling water pipeline at this time. The sealing ring is actually connected to the workpiece supporting platform of the muffle tank, and the workpiece supporting platform is easy to disassemble, which increases the flexibility of the sealing ring and facilitates replacement and maintenance.

[0046] The present invention starts the three-way valve to connect the sealed chamber with the furnace. The air pressure difference between the sealed chamber and the furnace will cause the gas in the sealed chamber to enter the furnace. After the gas in the sealed chamber is output, the cooling water has no pressure and will return to its original position. The sealing ring is reset under the action of the first reset part, causing the cooling water pipeline to leak out, and the sealed chamber is connected with the muffle tank. At this time, cooling water is introduced again, and the cooling water will enter the muffle tank to dissipate heat for the workpiece, thereby improving the heat dissipation effect and the forming effect of the workpiece.

[0047] The present invention ensures that the pressure of the gas introduced into the furnace before operation is insufficient to lift the sealing ring above the exhaust pipe. The sealing ring mainly plays a sealing role before operation, thereby improving the sealing effect.

[0048] In the present invention, the three-way valve is started to connect the sealed chamber with the furnace. The air pressure difference between the sealed chamber and the furnace will cause the gas in the sealed chamber to enter the furnace. The air pressure will cause the sealing ring to move toward the top of the muffle tank, and the protrusion will move accordingly. When the protrusion contacts the rotating block and moves upward, it will drive the rotating block to rotate, and the rotating block drives the rotating shaft to rotate. The rotation of the rotating shaft causes the sealing door to rotate. The sealing door is opened just after the heat treatment of the workpiece is completed, which is convenient for the carburizing furnace to discharge and feed materials and reduce heat loss during loading and unloading.

[0049] The present invention allows cooling water to enter the muffle tank and can also clean the muffle tank to a certain extent, saving subsequent cleaning time of the muffle tank and improving the working efficiency of the carburizing furnace. Moreover, the cooling water can be reused, which is both energy-saving and environmentally friendly.

[0050] The present invention controls the exhaust valve to open after the workpiece is taken out, so that the gas can be discharged from the furnace. After a certain amount of gas is discharged, the sealing ring is reset and the gas is no longer discharged. At this time, the gas can play a role in heat preservation.

[0051] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 This is a schematic diagram of the three-dimensional structure of a muffle tank structure for a carburizing furnace according to the present invention;

[0054] Figure 2 This is a front view structural schematic diagram of a muffle tank structure for a carburizing furnace according to the present invention;

[0055] Figure 3 This is a schematic top view of a muffle tank structure for a carburizing furnace according to the present invention;

[0056] Figure 4 For the present invention Figure 3 Cross-sectional view at AA in the middle;

[0057] Figure 5 For the present invention Figure 2 Cross-sectional view at the middle BB;

[0058] Figure 6 For the present invention Figure 4 A partial enlarged view of point C in the middle;

[0059] Figure 7 For the present invention Figure 4 A partial enlarged view of point D in the middle;

[0060] Figure 8 For the present invention Figure 4 A partial enlarged view of point E in the middle;

[0061] Figure 9 For the present invention Figure 5 A partial enlarged view of point F in the middle;

[0062] Figure 10 For the present invention Figure 4 A partial enlarged view of point G in the middle;

[0063] Figure 11 For the present invention Figure 4 A partial enlarged view of point H in the middle.

[0064] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0065] 110, carburizing furnace body; 120, gas introduction assembly; 1201, air pump; 1202, gas input pipe; 1203, gas output pipe; 1204, three-way valve; 1205, output pipe outlet; 130, cooling seal assembly; 1301, sealing ring; 1302, first return portion; 13021, first telescopic rod; 13022, first return spring; 1303, cooling water pipe; 1304, water-cooling seal groove; 140, top sealing assembly; 1401, sealing ring; 1402, second return part; 14021, second telescopic rod; 14022, second return spring; 14023, connecting block; 1403, protrusion; 1404, sealing door; 1405, mounting seat; 1406, rotating shaft; 1407, rotating block; 150, exhaust pipe; 160, exhaust valve; 170, control component; 210, furnace chamber; 220, sealing chamber; 230, muffle tank; 240, furnace table; 250, support member; 260, workpiece entrance; 270, furnace door. DETAILED DESCRIPTION

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0067] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0068] like Figure 1-11 As shown, this embodiment provides a muffle tank structure for a carburizing furnace, comprising a carburizing furnace body 110, a gas introduction assembly 120 disposed inside the carburizing furnace body 110, a cooling sealing assembly 130, and a top sealing assembly 140;

[0069] The middle cavity of the carburizing furnace body 110 forms a furnace chamber 210 and a sealed chamber 220 , respectively. The furnace chamber 210 is located above the sealed chamber 220 .

[0070] A muffle tank 230 is provided inside the furnace 210 , and a furnace platform 240 is provided below the muffle tank 230 .

[0071] The gas introduction assembly 120 is communicated with the furnace 210 and the sealed chamber 220 respectively. The cooling sealing assembly 130 is disposed in the sealed chamber 220 . The top sealing assembly 140 is disposed on the muffle tank 230 .

[0072] The gas introduction assembly 120 includes an air pump 1201, a gas input pipe 1202, a gas output pipe 1203, and a three-way valve 1204. The air pump 1201 is arranged on the carburizing furnace body 110, the gas input pipe 1202 is arranged at the input end of the air pump 1201, and the gas output pipe 1203 is arranged at the output end of the air pump 1201. The gas output pipe 1203 is a T-shaped pipe and has two output pipe openings 1205, one of which is in communication with the furnace 210, and the other is in communication with the sealed chamber 220. The three-way valve 1204 is arranged at the intersection of the gas output pipes 1203.

[0073] Among them, the gas input pipe 1202 is connected to the gas source, the air pump 1201 is responsible for inputting the gas from the gas source into the carburizing furnace body 110 through the gas output pipe 1203, and the three-way valve 1204 can respectively control the gas input pipe 1202 to be connected with the two output pipe openings 1205, and the two output pipe openings 1205 can also be connected to each other.

[0074] In this embodiment, during operation, the air pump 1201 is started, and the air pump 1201 draws gas from the gas source through the gas input pipe 1202. The three-way valve 1204 is first controlled to connect the gas source with the furnace 210, so that the gas fills the furnace 210. The gas surrounds the muffle tank 230, forming a gas insulation layer for the muffle tank 230, preventing temperature loss and improving the quality of heat treatment of the workpiece. Then, the three-way valve 1204 is controlled to connect the gas source with the sealed chamber 220, and the cooling water in the sealed chamber 220 is squeezed into the muffle tank 230 and toward the sealing ring 1301, making it seal more tightly, improving the sealing quality, and forming a bottom sealing structure of the sealing ring 1301-cooling water-gas, thereby improving the sealing quality and effectively blocking the heat loss between the muffle tank 230 and the furnace table 240, thereby improving the efficiency and quality of the heat treatment.

[0075] The cooling seal assembly 130 includes a sealing ring 1301, a first reset portion 1302, a cooling water pipe 1303, and a water-cooled sealing groove 1304. The sealing ring 1301 is disposed between the muffle tank 230 and the furnace table 240. The sealing ring 1301 has an annular structure. The first reset portion 1302 is disposed between the muffle tank 230 and the sealing ring 1301. The water-cooled sealing groove 1304 is disposed in the sealed chamber 220. One end of the cooling water pipe 1303 is in communication with the water-cooled sealing groove 1304, and the other end of the cooling water pipe 1303 is in communication with the muffle tank 230.

[0076] The sealing ring 1301 is composed of two layers, the upper layer is made of fiber and the lower layer is made of silicone rubber. The fiber layer has a high refractory temperature and is made of refractory fiber into a fiber packing shape, filling the gap between the muffle tank 230 and the furnace table 240 and being able to move in the gap.

[0077] In this embodiment, before operation, the sealing ring 1301 stretches the first reset portion 1302 due to gravity, and the sealing ring 1301 is not close to the muffle tank 230. During operation, since the cooling water enters the water-cooled sealing groove 1304 and is squeezed by the introduced gas and the air pressure is relatively large, it will move upward. The cooling water contacts and presses against the sealing ring 1301, so that the sealing ring 1301 is close to the workpiece supporting platform in the muffle tank 230. At this time, the sealing ring 1301 also blocks the cooling water pipe 1303, making it completely sealed. The sealing ring 1301 is actually connected to the workpiece supporting platform of the muffle tank 230, and the workpiece supporting platform is easy to disassemble, which increases the flexibility of the sealing ring 1301. Active, easy to replace and repair, after the heat treatment of the workpiece is completed, start the three-way valve 1204 to connect the sealed chamber 220 with the furnace 210, the air pressure difference between the sealed chamber 220 and the furnace 210 will cause the gas in the sealed chamber 220 to enter the furnace 210, after the gas in the sealed chamber 220 is output, the cooling water has no pressure and will return to its original position, the sealing ring 1301 is reset under the action of the first reset part 1302, causing the cooling water pipe 1303 to leak out, and the sealed chamber 220 is connected with the muffle tank 230, at this time, cooling water is introduced again, and the cooling water will enter the muffle tank 230 to dissipate heat to the workpiece, thereby improving the heat dissipation effect and the forming effect of the workpiece.

[0078] The cooling water will enter the muffle tank 230 and can also clean the muffle tank 230 to a certain extent, saving the subsequent cleaning time of the muffle tank 230 and improving the working efficiency of the carburizing furnace. Moreover, the cooling water can be reused, which is both energy-saving and environmentally friendly.

[0079] The top sealing assembly 140 includes a sealing ring 1401, a second reset portion 1402, a protrusion 1403, a sealing door 1404, a mounting seat 1405, a rotating shaft 1406, and a rotating block 1407. A plurality of second reset portions 1402 are provided on the inner wall of the furnace 210. The sealing ring 1401 is connected to the second reset portion 1402. The edge of the sealing ring 1401 is in close contact with the inner wall of the furnace 210. The protrusion 1403 is provided on the sealing ring 1401. The rotating shaft 1406 is movably provided on the muffle tank 230. The mounting seat 1405 is provided at the center of the rotating shaft 1406. The sealing door 1404 is connected to the mounting seat 1405. A rotating block 1407 is provided at each end of the rotating shaft 1406. The rotating block 1407 is located above the protrusion 1403.

[0080] Among them, the sealing ring 1401 seals the top of the muffle tank 230, the rotating shaft 1406 can rotate, and can also drive the sealing ring 1401 to rotate through the mounting seat 1405. The corners of the rotating block 1407 close to the protrusion 1403 are rounded to better cooperate with the protrusion 1403.

[0081] In this embodiment, before operation, the pressure of the gas introduced into the furnace 210 is not enough to raise the sealing ring 1401 above the exhaust pipe 150. The sealing ring 1401 mainly plays a sealing role before operation, thereby improving the sealing effect. After the heat treatment of the workpiece is completed, the three-way valve 1204 is started to connect the sealing chamber 220 with the furnace 210. The air pressure difference between the sealing chamber 220 and the furnace 210 will cause the gas in the sealing chamber 220 to enter the furnace 210. The air pressure will cause the sealing ring 1401 to move toward the top of the muffle tank 230, and the protrusion 1403 will also move accordingly. When the protrusion 1403 contacts the rotating block 1407 and then moves upward, it will drive the rotating block 1407 to rotate, and the rotating block 1407 drives the rotating shaft 1406 to rotate. The rotation of the rotating shaft 1406 causes the sealing door 1404 to rotate. The sealing door 1404 is opened just after the heat treatment of the workpiece is completed, which is convenient for the carburizing furnace to discharge and feed materials and reduce heat loss during loading and unloading.

[0082] The first return portion 1302 includes a first telescopic rod 13021 and a first return spring 13022. The bottom of the muffle tank 230 is provided with a plurality of first mounting grooves. The first telescopic rod 13021 and the first return spring 13022 are disposed in the first mounting grooves. The first return spring 13022 is disposed around the first telescopic rod 13021. The movable end of the first telescopic rod 13021 is connected to the sealing ring 1301.

[0083] The moving end of the first telescopic rod 13021 will contract when subjected to force, and cooperate with the first return spring 13022 to restore the object at the moving end of the first telescopic rod 13021.

[0084] The second return portion 1402 includes a second telescopic rod 14021, a second return spring 14022, and a connecting block 14023. A plurality of second mounting grooves are provided on the inner wall of the furnace chamber 210. The second telescopic rod 14021 and the second return spring 14022 are disposed in the second mounting grooves. The second return spring 14022 is disposed around the second telescopic rod 14021. The connecting block 14023 is disposed at the output end of the second telescopic rod 14021 and is connected to the sealing ring 1401.

[0085] The working principle of the second reset unit 1402 is the same as that of the first reset unit 1302 .

[0086] The carburizing furnace body 110 is provided with an exhaust pipe 150 , which is in communication with the furnace 210 , and an exhaust valve 160 is provided on the exhaust pipe 150 ;

[0087] The exhaust pipe 150 can discharge the gas in the furnace 210 , and the exhaust valve 160 controls the flow of the exhaust pipe 150 .

[0088] In this embodiment, after the workpiece is taken out, the exhaust valve 160 is controlled to open, and the gas can be discharged from the furnace 210. After a certain amount of gas is discharged, the sealing ring 1401 is reset and the gas is no longer discharged. At this time, the gas can play a role in heat preservation.

[0089] A support member 250 is provided at the bottom of the furnace platform 240. The furnace platform 240 is arranged inside the carburizing furnace body 110 through the support member 250. A workpiece entrance 260 is provided at the top of the carburizing furnace body 110. A furnace door 270 is hingedly provided on one side of the top of the carburizing furnace body 110. A control component 170 is provided on the carburizing furnace body 110.

[0090] The furnace door 270 is provided with a square thin wall corresponding to the workpiece inlet 260. After the furnace door 270 is closed, the square thin wall seals the workpiece inlet 260. The control component 170 mainly controls the heat treatment stage of the carburizing furnace.

[0091] A process for using a muffle tank structure for a carburizing furnace comprises the following steps:

[0092] S1, put the workpiece in;

[0093] Open the furnace door 270 and the sealing door 1404, place the workpiece to be processed into the muffle tank 230, and support it above the furnace table 240;

[0094] S2, sealing;

[0095] Cooling water is introduced into the water-cooling sealing groove 1304. After entering the water-cooling sealing groove 1304, the cooling water is introduced into the water inlet on the inner side of the muffle tank 230 and overflows from the overflow outlet on the outer side of the muffle tank 230. This naturally overflowing water inlet structure ensures that the cooling water level does not drop and is automatically maintained at a high level. In addition, the cooling water flows from the water inlet on the inner side of the muffle tank 230, downwardly passes through the lower end of the muffle tank 230, and then rises upward until it overflows from the overflow outlet on the outer side of the muffle tank 230.

[0096] S3, introducing gas;

[0097] Start the air pump 1201, and first connect it to the furnace 210 through the gas output pipe 1203 and the three-way valve 1204, and pass the gas into the furnace 210. After a certain amount of gas is passed, connect it to the sealed chamber 220, and pass the gas into the sealed chamber 220. The gas pressure will cause the cooling water to flow toward the sealing ring 1301 in the muffle tank 230. The cooling water will press against the sealing ring 1301, causing the sealing ring 1301 to move upward, thus supporting the gap between the muffle tank 230 and the furnace table 240.

[0098] S4, heat treatment;

[0099] The furnace 240 starts heating to heat the workpiece inside the muffle tank 230;

[0100] S5, end;

[0101] S5.1. Cooling;

[0102] After the workpiece heat treatment is completed, the three-way valve 1204 is started to connect the furnace 210 with the sealed chamber 220, and the gas in the sealed chamber 220 enters the furnace 210. The cooling water in the muffle tank 230 enters the water-cooled sealing groove 1304. The sealing ring 1301, which is not supported by the cooling water, moves downward, causing the cooling water pipe 1303 previously blocked by the sealing ring 1301 to leak. The cooling water enters the muffle tank 230 from the cooling water pipe 1303 to cool the workpiece.

[0103] S5.2, remove the workpiece;

[0104] The gas in the sealed chamber 220 enters the furnace 210. The gas inside the furnace 210 causes the sealing ring 1401 to move upward, and the protrusion 1403 presses against the rotating block 1407, causing the rotating block 1407 to rotate. The rotation of the rotating block 1407 drives the rotating shaft 1406 to rotate, and the rotation of the rotating shaft 1406 drives the sealing door 1404 to rotate, thereby removing the workpiece.

[0105] S5.3, exhaust gas;

[0106] After the workpiece is taken out, the exhaust valve 160 is opened and the gas is discharged to the outside through the exhaust pipe 150. After the gas is discharged, the sealing ring 1401 is reset.

[0107] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A muffle tank structure for a carburizing furnace, characterized in that: It comprises a carburizing furnace body (110), a gas introduction assembly (120) arranged inside the carburizing furnace body (110), a cooling sealing assembly (130), and a top sealing assembly (140); The middle cavity of the carburizing furnace body (110) forms a furnace (210) and a sealed chamber (220), respectively, and the furnace (210) is located above the sealed chamber (220); A muffle tank (230) is provided inside the furnace (210), and a furnace platform (240) is provided below the muffle tank (230); The gas introduction assembly (120) is respectively in communication with the furnace (210) and the sealed chamber (220); the cooling sealing assembly (130) is disposed in the sealed chamber (220); and the top sealing assembly (140) is disposed on the muffle tank (230); The gas introduction component (120) includes an air pump (1201), a gas input pipe (1202), a gas output pipe (1203) and a three-way valve (1204), wherein the air pump (1201) is arranged on the carburizing furnace body (110), the gas input pipe (1202) is arranged at the input end of the air pump (1201), and the gas output pipe (1203) is arranged at the output end of the air pump (1201), the gas output pipe (1203) is a T-shaped pipe, and the gas output pipe (1203) is provided with two output pipe openings (1205), wherein one of the output pipe openings (1205) is communicated with the furnace (210), and the other output pipe opening (1205) is communicated with the sealed chamber (220), and the three-way valve (1204) is arranged at the intersection of the gas output pipes (1203); The cooling sealing assembly (130) comprises a sealing ring (1301), a first reset portion (1302), a cooling water pipe (1303), and a water-cooling sealing groove (1304). The sealing ring (1301) is arranged between the muffle tank (230) and the furnace table (240). The sealing ring (1301) is an annular structure. The first reset portion (1302) is arranged between the muffle tank (230) and the sealing ring (1301), the water-cooling sealing groove (1304) is arranged in the sealing chamber (220), one end of the cooling water pipe (1303) is connected to the water-cooling sealing groove (1304), and the other end of the cooling water pipe (1303) is connected to the muffle tank (230); The top sealing assembly (140) includes a sealing ring (1401), a second reset portion (1402), a protrusion (1403), a sealing door (1404), a mounting seat (1405), a rotating shaft (1406) and a rotating block (1407). A plurality of second reset portions (1402) are provided on the inner wall of the furnace (210). The sealing ring (1401) is connected to the second reset portion (1402). The edge of the sealing ring (1401) is in close contact with the furnace (210). 10) inner wall, the protrusion (1403) is provided on the sealing ring (1401), the rotating shaft (1406) is movably provided on the muffle tank (230), the mounting seat (1405) is provided at the center of the rotating shaft (1406), the sealing door (1404) is connected to the mounting seat (1405), and a rotating block (1407) is provided at each end of the rotating shaft (1406), and the rotating block (1407) is located above the protrusion (1403); The first return portion (1302) includes a first telescopic rod (13021) and a first return spring (13022); a plurality of first mounting grooves are provided at the bottom of the muffle tank (230); the first telescopic rod (13021) and the first return spring (13022) are provided in the first mounting grooves; the first return spring (13022) is provided around the first telescopic rod (13021); and the movable end of the first telescopic rod (13021) is connected to the sealing ring (1301); The second reset portion (1402) comprises a second telescopic rod (14021), a second reset spring (14022) and a connecting block (14023); a plurality of second mounting grooves are provided on the inner wall of the furnace (210); the second telescopic rod (14021) and the second reset spring (14022) are arranged in the second mounting grooves; the second reset spring (14022) is arranged around the second telescopic rod (14021); the connecting block (14023) is provided at the output end of the second telescopic rod (14021); and the connecting block (14023) is connected to the sealing ring (1401).

2. A muffle tank structure for a carburizing furnace according to claim 1, characterized in that: An exhaust pipe (150) is provided on the carburizing furnace body (110), the exhaust pipe (150) is in communication with the furnace (210), and an exhaust valve (160) is provided on the exhaust pipe (150).

3. A muffle tank structure for a carburizing furnace according to claim 2, characterized in that: A support member (250) is provided at the bottom of the furnace table (240), and the furnace table (240) is arranged inside the carburizing furnace body (110) through the support member (250). A workpiece entrance (260) is provided at the top of the carburizing furnace body (110), and a furnace door (270) is hingedly provided on one side of the top of the carburizing furnace body (110). A control component (170) is provided on the carburizing furnace body (110).

4. The process for using the muffle structure for a carburizing furnace according to claim 3, wherein: The following steps are involved: S1, put the workpiece in; Open the furnace door (270) and the sealing door (1404), place the workpiece to be processed into the muffle tank (230), and support it above the furnace table (240); S2, sealing; Cooling water is introduced into the water-cooling sealing groove (1304). After the cooling water enters the water-cooling sealing groove (1304), the cooling water is introduced into the water inlet on the inner side of the muffle tank (230) and overflows from the overflow outlet on the outer side of the muffle tank (230). The cooling water flows from the water inlet on the inner side of the muffle tank (230), passes downward through the lowermost end of the muffle tank (230), and then rises upward until it overflows from the overflow outlet on the outer side of the muffle tank (230). S3, introducing gas; Start the air pump (1201), and first connect it to the furnace (210) through the gas output pipe (1203) and the three-way valve (1204), and pass the gas into the furnace (210). After a certain amount of gas is passed, connect it to the sealed chamber (220), and pass the gas into the sealed chamber (220). The gas pressure will cause the cooling water to flow toward the sealing ring (1301) in the muffle tank (230). The cooling water will press against the sealing ring (1301), causing the sealing ring (1301) to move upward, and press against the gap between the muffle tank (230) and the furnace table (240); S4, heat treatment; The furnace (240) starts heating to heat the workpiece inside the muffle tank (230); S5, end; S5.

1. Cooling; After the heat treatment of the workpiece is completed, the three-way valve (1204) is started to connect the furnace (210) with the sealed chamber (220), the gas in the sealed chamber (220) enters the furnace (210), the cooling water in the muffle tank (230) enters the water-cooled sealing groove (1304), the sealing ring (1301) without cooling water moves downward, causing the cooling water pipe (1303) previously blocked by the sealing ring (1301) to leak out, and the cooling water enters the muffle tank (230) from the cooling water pipe (1303) to cool the workpiece; S5.2, remove the workpiece; The gas in the sealing chamber (220) enters the interior of the furnace (210), and the gas inside the furnace (210) causes the sealing ring (1401) to move upward, and the protrusion (1403) presses against the rotating block (1407), causing the rotating block (1407) to rotate, and the rotation of the rotating block (1407) drives the rotating shaft (1406) to rotate, and the rotation of the rotating shaft (1406) drives the sealing door (1404) to rotate, thereby removing the workpiece; S5.3, exhaust gas; After the workpiece is taken out, the exhaust valve (160) is opened, and the gas is discharged to the outside through the exhaust pipe (150). After the gas is discharged, the sealing ring (1401) is reset.

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