CN115369353A - Workpiece carburizing production line with quenching and slow cooling functions and workpiece heat treatment method - Google Patents
Workpiece carburizing production line with quenching and slow cooling functions and workpiece heat treatment method Download PDFInfo
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- 238000010583 slow cooling Methods 0.000 title claims abstract description 363
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- 238000005255 carburizing Methods 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 74
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 225
- 238000007599 discharging Methods 0.000 claims abstract description 127
- 230000008569 process Effects 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims description 67
- 238000007789 sealing Methods 0.000 claims description 43
- 238000001816 cooling Methods 0.000 claims description 36
- 230000001681 protective effect Effects 0.000 claims description 36
- 238000004880 explosion Methods 0.000 claims description 22
- 239000002912 waste gas Substances 0.000 claims description 22
- 230000000670 limiting effect Effects 0.000 claims description 19
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- 239000012528 membrane Substances 0.000 description 3
- 208000012260 Accidental injury Diseases 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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Abstract
A work piece carburization production line and work piece heat treatment method with quenching and slow cooling function concurrently, wherein the work piece carburization production line includes push away the disc carburizing furnace, quenching chamber and push away the disc type slow cooling furnace sealingly connected sequentially, the discharging mechanism of carburizing furnace can push the work piece after the carburization treatment to the sealed antechamber of the quenching chamber selectively or push away to the slow cooling furnace of push away the disc type through the sealed antechamber, so that the work piece quenches the moving mechanism and drives the work piece to carry on the quenching operation from the sealed antechamber to the quenching tank, then export the work piece through the discharging chamber again, or make the guide chain moving mechanism step-wise drive several work pieces to carry on the slow cooling operation in the slow cooling space of the slow cooling furnace of push away disc type, then push away the work piece after the slow cooling into the slow cooling and discharge air exchange chamber and export the work piece by the discharging mechanism of the slow cooling furnace; the quenching or slow cooling operation is operated in the environment of isolating air and controlling the carburizing atmosphere, so that the selective operation of the quenching or slow cooling process of the workpiece after carburization can be realized, and the mass continuous production of the slow cooling process can be realized.
Description
Technical Field
The invention relates to the technical field of workpiece heat treatment, in particular to a workpiece carburizing production line with quenching and slow cooling functions and a workpiece heat treatment method.
Background
At present, the heat treatment carburization and subsequent slow cooling process of a workpiece are generally realized by directly connecting a periodic furnace with a single-chamber slow cooling chamber, and the process comprises the steps of firstly using the periodic furnace to perform protective atmosphere carburization on the workpiece and then feeding the workpiece into the single-chamber slow cooling chamber to perform slow cooling. The single-chamber slow cooling chamber has the advantages that the space size of the slow cooling chamber is small, even a small amount of air enters the slow cooling chamber, the slow cooling chamber can be directly ignited by the mixture of open fire of a high-temperature workpiece and the entering combustible atmosphere, and explosion can not be generated generally. However, the single-chamber slow cooling chamber can only perform slow cooling operation on one workpiece every time, and the slow cooling process period is long, so that the overall production efficiency of workpiece carburization and slow cooling is very low, and the mass production of workpieces cannot be realized. In addition, as the demands of users on the heat treatment process of the workpiece are more and more diversified, and part of users require that the workpiece is subjected to the quenching process immediately after the carburizing process, in order to meet the diversified demands of the users and ensure the safe implementation and process quality of the process (air is required to be prevented from entering in the slow cooling or quenching process), two production lines are usually required for realizing the carburizing and slow cooling or quenching process of the workpiece, one production line is a periodic furnace directly connected with a single-chamber slow cooling chamber to realize the carburizing and slow cooling process of the workpiece, and the other production line is a periodic furnace directly connected with a quenching chamber to realize the carburizing and quenching process of the workpiece, so that the cost investment of production equipment is high, the production equipment occupies a large production field, and the production lines cannot realize the mass production of the workpiece, so that the production efficiency of the production lines is very low.
Therefore, how to develop a heat treatment production line which has relatively low equipment cost investment, can save production land, and can realize workpiece carburization and subsequent process mass production is one of the technical problems to be solved in the field.
Disclosure of Invention
The technical problem to be solved by the technical scheme is how to enable the heat treatment carburization production line of the workpiece to simultaneously meet the requirements of subsequent processes of quenching and slow cooling, and the whole production line can realize mass production of the workpiece.
In order to solve the technical problem, the technical scheme provides a workpiece carburizing production line with quenching and slow cooling functions, and the workpiece carburizing production line comprises a push disc carburizing furnace, a quenching chamber and a push disc type slow cooling furnace; wherein, a discharge port of the carburizing furnace of the push-plate carburizing furnace is communicated with one side of a sealing front chamber of the quenching chamber, a sealing furnace door is arranged at the discharge port of the carburizing furnace, and a discharging mechanism of the carburizing furnace is arranged on the side wall of the push-plate carburizing furnace opposite to the discharge port of the carburizing furnace; the quenching chamber comprises a sealed front chamber, a discharge chamber, a quenching tank and a workpiece quenching moving mechanism, the sealed front chamber and the discharge chamber are positioned above the quenching tank, the lower parts of the sealed front chamber and the discharge chamber are communicated with the quenching tank, and the workpiece quenching moving mechanism is arranged in the sealed front chamber, the discharge chamber and the quenching tank; the push-tray slow cooling furnace comprises a furnace body, a guide chain moving mechanism, a gas circulating mechanism, a heat preservation mechanism, a cooling mechanism, a slow cooling discharge air exchange chamber, a waste gas discharge mechanism, a protective gas inlet mechanism and a slow cooling furnace discharge mechanism, wherein a slow cooling space is formed in the furnace body, the side walls at two ends of the furnace body are respectively provided with a slow cooling feed inlet and a slow cooling discharge outlet which are communicated with the slow cooling space and are provided with a sealed furnace door, the guide chain moving mechanism and the gas circulating mechanism are respectively arranged in the furnace body and are respectively positioned at the bottom and the top of the slow cooling space, the heat preservation mechanism and the cooling mechanism are respectively arranged in the furnace body and are respectively positioned at one section of the adjacent slow cooling feed inlet in the slow cooling space and one section of the adjacent slow cooling discharge outlet, the slow cooling discharge air exchange chamber is arranged at the outer side of the slow cooling discharge outlet, the waste gas discharge mechanism and the protective gas inlet mechanism are respectively arranged on the side wall of the furnace body close to the slow cooling feed inlet and the top of the slow cooling discharge chamber and are respectively arranged on the side wall of the slow cooling chamber and the slow cooling discharge outlet and are respectively communicated with the inner side of the slow cooling chamber and the slow cooling chamber at the other side of the front chamber, the slow cooling discharge outlet of the furnace body, the slow cooling furnace body, and the slow cooling furnace body are respectively arranged on the side wall of the furnace body, and connected with the front chamber; the discharging mechanism of the carburizing furnace can selectively push the workpieces processed by the push-disk carburizing furnace to the workpiece quenching moving mechanism in the sealed front chamber or the guide chain moving mechanism in the push-disk slow cooling furnace, so that the workpiece quenching moving mechanism drives the workpieces to carry out quenching operation from the sealed front chamber to the quenching tank, and then the workpieces are output through the discharging chamber, or the guide chain moving mechanism drives a plurality of workpieces to carry out slow cooling operation in a slow cooling space in a stepping manner, and then the workpieces after slow cooling are pushed into the slow cooling discharging ventilating chamber by the slow cooling furnace discharging mechanism to be output. According to the workpiece carburizing production line, the push disc carburizing furnace, the quenching chamber and the push disc type slow cooling furnace are sequentially and hermetically connected according to the workpiece heat treatment process flow, the sealed front chamber of the quenching chamber is used as a 'transfer platform', the workpiece carburized by the push disc carburizing furnace can be pushed to the sealed front chamber by the carburizing furnace discharging mechanism to implement a quenching process, and can also be pushed to the slow cooling space of the push disc type slow cooling furnace by the carburizing furnace discharging mechanism through the sealed front chamber to implement a slow cooling process, and the workpiece carburizing production line can simultaneously meet various process procedures through the selective operation, so that the cost investment of production equipment is reduced, and the production land is saved; moreover, the push-plate type slow cooling furnace can simultaneously meet the slow cooling operation of a plurality of workpieces in the slow cooling space, and the conveying structure of the plurality of workpieces which are close to each other can also reduce the volume of the closed space in the slow cooling space, therefore, the mass production of the workpieces can be realized, the production efficiency of the workpiece carburizing production line is improved, and the risk of explosion can be reduced. In addition, before the quenching process and in the slow cooling process, the workpiece is required to be incapable of high-temperature oxidation, and in the process of transferring the workpiece to a sealed front chamber or a slow cooling space, the carburizing atmosphere in the push disc carburizing furnace inevitably enters the quenching chamber and the push disc type slow cooling furnace, because the carburizing atmosphere contains a large amount of hydrogen and carbon monoxide atmosphere, and the temperature in the push disc type slow cooling furnace is reduced from about 900 ℃ to about 100 ℃ in the slow cooling process, the temperature is gradually lower than the explosion safety temperature of 750 ℃, and because the slow cooling operation of a plurality of workpieces is simultaneously carried out in the push disc type slow cooling furnace, the size of the sealed space is larger, and sparks are inevitably generated in the transfer process of the workpieces, therefore, in order to prevent the carburized workpieces from being oxidized in the subsequent process, the explosion danger caused by the fact that a small amount of air enters the push disc type slow cooling furnace is further prevented, the quenching chamber of the technical scheme is characterized in that the sealed front chamber and the discharge chamber are arranged at the upper part of the quenching tank, and are physically isolated from the sealed medium by the quenching medium, so as to effectively prevent the air from entering the production line of the workpiece in the carburizing chamber; the slow cooling discharge air exchange chamber arranged outside the slow cooling discharge port of the push-disc slow cooling furnace can also effectively prevent air from entering a workpiece carburizing production line through the discharge end of the push-disc slow cooling furnace; furthermore, the waste gas discharge mechanism and the protective gas inlet mechanism are respectively arranged on the side wall of the furnace body close to the slow cooling feed port and the slow cooling discharge port, so that protective gas (generally nitrogen) can flow from the slow cooling discharge port to the slow cooling feed port, namely, the protective gas flows from the low-temperature section to the high-temperature section (the low-temperature section has greater explosion danger due to the temperature being lower than the explosion safety temperature of 750 ℃), thereby effectively avoiding the explosion danger of the push-plate slow cooling furnace, and further maintaining the furnace pressure in the push-plate slow cooling furnace.
As another implementation of the technical scheme, the workpiece quenching moving mechanism comprises a quenching lifter, a transfer platform, a transfer push chain, a discharging lifter and a discharging lifter; the quenching lifter is arranged on the outer side surface of the top wall of the sealed front chamber, and the lifting driving end of the quenching lifter vertically penetrates through the top wall of the sealed front chamber downwards and is positioned in the sealed front chamber; the quenching lifting platform can be vertically moved and is arranged in the sealed front chamber and consists of a quenching platform and a frame body which is arranged on the upper part of the quenching platform in a surrounding way, the quenching platform is flush with the bottom of the sealed front chamber in the initial state, and the lifting driving end of the quenching lifting machine is fixedly connected with the top of the frame body of the quenching lifting platform; the transfer platform is horizontally arranged in the quenching tank and is provided with a tank position corresponding to the quenching lifting platform and the discharging lifting platform; the transfer push chain is composed of an L-shaped chain guide plate, a chain, a driving motor and a driving wheel, wherein the L-shaped chain guide plate is arranged outside the sealing front chamber, the vertical section of the L-shaped chain guide plate penetrates into the quenching tank, the horizontal section of the L-shaped chain guide plate abuts against the upper side face of the transfer platform, the chain is movably embedded in the L-shaped chain guide plate, the driving motor is arranged above the quenching tank and positioned beside the L-shaped chain guide plate, and the driving wheel is arranged at the driving end of the driving motor and is in meshed driving connection with the chain; the discharging lifter is arranged on the outer side surface of the top wall of the discharging chamber, and the lifting driving end of the discharging lifter vertically penetrates through the top wall of the discharging chamber downwards and is positioned in the discharging chamber; the discharging lifting platform can be vertically moved and is arranged in the discharging chamber and consists of a discharging platform and a frame body which is arranged on the upper part of the discharging platform in a surrounding manner, and a lifting driving end of the discharging lifting machine is fixedly connected with the top of the frame body of the discharging lifting platform; the carburizing furnace discharging mechanism pushes the workpiece to the quenching platform, the quenching platform is driven by the quenching lifter to descend to the corresponding slot position of the transfer platform, the quenching platform is aligned with the upper side surface of the transfer platform, then the driving motor of the transfer push chain drives the chain to push the workpiece to the discharging platform of the discharging lifter descending to the corresponding slot position of the transfer platform, and the discharging lifter is driven by the discharging lifter to lift the discharging lifter to the discharging chamber to output the workpiece. Therefore, the sealed front chamber and the discharge chamber can be physically separated through the quenching medium, air can be effectively prevented from entering the sealed front chamber from the discharge end, and the loss of quenching steam generated after the workpiece is quenched can be prevented.
As another implementation of the technical scheme, the quenching chamber further comprises a gas baffle, an isolating door lifting mechanism, a waste gas discharge port and a protective gas inlet; the gas barrier is vertically arranged at the upper part in the quenching tank and positioned between the sealed front chamber and the discharging chamber, and the lower end part of the gas barrier is inserted below the liquid level of the quenching medium in the quenching tank so as to isolate the upper part of the liquid level of the quenching medium in the quenching tank; the isolating door lifting mechanism comprises an isolating door, a lifting motor and an isolating plate, the isolating door is vertically arranged on the quenching tank between the sealed front chamber and the discharging chamber and can move up and down, the lifting motor is arranged above the quenching tank, is positioned beside the isolating door and is in driving connection with the isolating door, the isolating plate is vertically arranged below the transfer platform corresponding to the position of the isolating door, and the lifting motor can drive the isolating door to move down to abut against the transfer platform so as to enable the isolating door and the isolating plate to separate the quenching tank into a quenching area and a discharging area; the exhaust gas outlet and the shielding gas inlet are both arranged in the sealing front chamber. Therefore, the arrangement of the air isolation plate and the isolation door lifting mechanism can further prevent the outside air from entering the sealed front chamber from the discharging chamber and prevent the quenching steam from streaming to the discharging chamber from the sealed front chamber; and the arrangement of the waste gas discharge port and the protective gas inlet can effectively reduce the influence of the carburizing atmosphere on the subsequent process.
As another implementation of the technical solution, the push-plate carburizing furnace, the quenching chamber and the push-plate type slow cooling furnace are all provided with two parallel guide rails connected with each other so as to facilitate the pushing and transferring of the workpiece between the devices of the workpiece carburizing production line, wherein the guide rails in the push-plate carburizing furnace are generally composed of silicon carbide guide rails or heat-resistant steel guide rails, and the guide rails in the quenching chamber and the push-plate type slow cooling furnace are composed of heat-resistant steel guide rails; the guide chain moving mechanism is arranged between two parallel guide rails at the bottom of a slow cooling space along the direction from a slow cooling feed port to a slow cooling discharge port, and comprises C-shaped groove rails formed by assembling a plurality of sections of groove rails according to a sequence, a plurality of fixed grooves, a guide chain, a material pulling head and a reciprocating drive motor, wherein each groove rail is formed by oppositely jointing two channel steel grooves at intervals, the C-shaped groove rails are arranged between the two parallel guide rails at the bottom of the slow cooling space, the fixed grooves are fixedly arranged on the inner sides of the C-shaped groove rails at the same intervals corresponding to the plurality of sections of groove rails, the groove rails are respectively and fixedly embedded in the grooves of the fixed grooves, the guide chain is movably embedded in the C-shaped groove rails, the material pulling head is fixedly combined on the upper side face of the guide chain close to the slow cooling feed port and is exposed on the upper side of the C-shaped groove rails, the reciprocating drive motor is arranged at the bottom of the furnace body, and the drive end of the reciprocating drive motor is in meshed drive connection with the guide chain through a chain wheel. Therefore, the structural strength of the guide chain moving mechanism can be effectively enhanced through the coating support structure of the guide chain by the C-shaped groove rail and the fixed groove, so that the carrying capacity of the guide chain moving mechanism is improved; because the height difference exists between the guide rail at the bottom in the slow cooling space and the guide chain moving mechanism, the workpiece pushed into the slow cooling space is placed on the guide rail, and the guide chain in the C-shaped groove rail is driven by the reciprocating driving motor to drive the material pulling head to move in a reciprocating mode, so that the workpiece fed through the slow cooling feed port is pushed by the material pulling head and abuts against the workpiece in front to move, a plurality of workpieces in the slow cooling space move towards the slow cooling discharge port in a stepping moving mode along the guide rail one by one, and the conveying structure with the plurality of workpieces close to each other can effectively reduce the size of a spacious closed space in the slow cooling space, thereby effectively reducing the possibility of deflagration or explosion of the push-plate type slow cooling furnace; in addition, the conveying mechanism for the workpieces in the furnace, which mainly comprises the C-shaped groove rail, the guide chain and the reciprocating driving motor, can also effectively reduce the complexity of the mechanism and reduce the occupation of the bottom space of the push-disk type slow cooling furnace.
As another implementation of this technical scheme, this gas circulation mechanism is by several circulating fan, wind-guiding roof and two wind-guiding curb plates constitute, wherein, this several circulating fan sets up in the top in slow cooling space along the direction interval looks equidistance of slow cooling feed inlet to slow cooling discharge gate, the wind-guiding roof has seted up several fan hole corresponding to several circulating fan, the wind-guiding roof level to set up in the top in slow cooling space and make the fan hole correspond the cover and establish circulating fan, these two wind-guiding curb plates vertical set up in slow cooling space and lie in the both sides of two parallel guide rails, and the upper edge of these two wind-guiding curb plates combines fixedly with the both sides edge of wind-guiding roof respectively. The air flow generated by the circulating fan is guided by the air guide top plate and the air guide side plate, so that the air flow flows orderly and rapidly in a fixed direction, the slow cooling uniformity of a workpiece is ensured, and the quality of a product is improved.
As another implementation of the technical scheme, the heat preservation mechanism is composed of a plurality of heating elements, and the plurality of heating elements are arranged at one section of the slow cooling space adjacent to the slow cooling feed port and are respectively positioned between two side walls of the furnace body and the two air guide side plates; the cooling mechanism is composed of a plurality of snakelike array tubes and a plurality of radiating fins sleeved on the snakelike array tubes, and the snakelike array tubes are arranged at one section of the slow cooling space adjacent to the slow cooling discharge port and are respectively positioned between two side walls of the furnace body and the two air guide side plates; the heat preservation mechanism and the cooling mechanism divide the slow cooling space into a heat preservation section and a cooling section. Therefore, the work piece is enabled to perform slow cooling operation according to the process requirement of slow cooling in the moving process of the slow cooling space.
As another kind of implementation of this technical scheme, this work piece carburization production line still includes two explosion-proof pressure relief device, every explosion-proof pressure relief device all is by the flange, the rupture membrane, heat preservation and guard plate constitute, wherein, the rupture membrane sets up in the flange hole of flange, the heat preservation sets up in the bottom of flange, the guard plate sets up in the top of flange, and explosion-proof pressure release mouth has all been seted up at the top of furnace body and the top of slow cooling ejection of compact scavenge chamber, these two explosion-proof pressure relief device install respectively with the flange is fixed on the explosion-proof pressure release mouth of furnace body and slow cooling ejection of compact scavenge chamber. The explosion-proof pressure relief device can be used as a safety device for emergency pressure relief of the push-disk type slow cooling furnace under the condition of extreme uncontrollable condition, such as the condition that air enters the push-disk type slow cooling furnace and is mixed with the atmosphere in the furnace to generate local deflagration, wherein the arrangement of the protection plate can effectively prevent objects in the furnace from flying out to cause accidental injury.
As another implementation of the technical scheme, the carburizing furnace discharging mechanism and the slow cooling furnace discharging mechanism are both coil chain pushing structures consisting of coil chain rails, chains, driving motors, chain wheels and pushing heads. Therefore, the occupied space of the discharging mechanism can be saved.
As another implementation of the present solution, the workpiece carburizing production line further includes: a plurality of thermocouples, a workpiece limiting mechanism and a central control unit; the plurality of thermocouples are arranged in the slow cooling space; the workpiece limiting mechanism is composed of a limiting rod, an elastic reset piece and a travel switch, the limiting rod is movably arranged on the side wall of the furnace body opposite to the slow cooling feed inlet, the elastic reset piece is arranged on the limiting rod, and the travel switch is arranged on the outer side of the furnace body and can be movably contacted with the limiting rod; the central control unit is respectively electrically connected with the plurality of thermocouples, the travel switch, a sealing furnace door of a discharge port of the carburizing furnace, a discharging mechanism of the carburizing furnace, a workpiece quenching moving mechanism, a sealing furnace door of a slow cooling feed port and a slow cooling discharge port, a guide chain moving mechanism, a gas circulation mechanism, a heat preservation mechanism, a cooling mechanism, a slow cooling discharge scavenging chamber, a waste gas discharge mechanism, a protective gas inlet mechanism and a slow cooling furnace discharging mechanism. Therefore, the full-automatic operation of the workpiece carburizing production line can be realized, and the labor cost is saved.
In order to solve the technical problem, the technical scheme also provides a workpiece heat treatment method, which comprises the following steps:
carburizing operation: carrying out carburizing treatment on a plurality of workpieces in a push disc carburizing furnace;
selective operation of subsequent processes: according to the subsequent process requirements, the carburization furnace discharge mechanism of the push-disk carburization furnace pushes the carburized workpieces one by one to a sealed front chamber of a quenching chamber hermetically connected with a discharge port of the carburization furnace of the push-disk carburization furnace for quenching operation, or pushes the carburized workpieces one by one through the sealed front chamber to a workpiece feed position of the push-disk slow cooling furnace hermetically connected with the sealed front chamber for slow cooling operation, or selectively pushes the carburized workpieces to the sealed front chamber or the workpiece feed position for crossed quenching operation or slow cooling operation;
quenching operation: the workpiece positioned in the sealing front chamber is driven by the workpiece quenching moving mechanism to descend into the quenching tank for quenching, and then is driven by the workpiece quenching moving mechanism to ascend to a discharge chamber hermetically isolated from the sealing front chamber for outputting the workpiece;
slow cooling operation: the workpiece on the workpiece feeding level is driven by the guide chain moving mechanism to leave the workpiece feeding level and move in a stepping mode towards the slow cooling discharge hole, meanwhile, the workpiece feeding level is pushed into the next workpiece to be slowly cooled, protective gas is injected into the push disc type slow cooling furnace through the protective gas inlet mechanism arranged close to the slow cooling discharge hole, the flowing direction of the protective gas is opposite to the moving direction of the workpiece, so that the protective gas dilutes the carburizing atmosphere at the workpiece feeding level and is discharged out of the push disc type slow cooling furnace through the waste gas discharge mechanism arranged close to the slow cooling feed hole, and the workpiece is firstly insulated by the heat insulation mechanism in the moving process, then is cooled by the cooling mechanism and then is pushed to the slow cooling discharge scavenging chamber through the slow cooling furnace discharge mechanism to output the workpiece.
Therefore, the workpiece heat treatment method can implement selective quenching or slow cooling process operation on the carburized workpiece, and realize mass production of the slow cooling process of the workpiece in a safe atmosphere environment for preventing air from entering, thereby improving the heat treatment efficiency and quality of the workpiece.
Drawings
FIG. 1 is a top view of one embodiment of a workpiece carburizing production line of the present invention;
FIG. 2 is a schematic view of a push-plate carburizing furnace, a sealing front chamber and a push-plate slow cooling furnace according to the present invention, which are connected in sequence;
FIG. 3 is a side sectional view of a push-plate type slow cooling furnace according to the present invention;
FIG. 4 is a top sectional view of the push-plate type slow cooling furnace of the present invention;
FIG. 5 is a sectional view of the heat retaining section of the push-plate type slow cooling furnace according to the present invention;
FIG. 6 is a sectional view of the cooling zone of the push-plate type slow cooling furnace according to the present invention;
FIG. 7 is a front cross-sectional view of a quenching chamber in the invention;
FIG. 8 is a schematic view of the chain guide moving mechanism of the present invention;
FIG. 9 is a cross-sectional view of the chain guide moving mechanism of the present invention;
fig. 10 is a schematic view of a cooling mechanism in the present invention.
Symbolic illustration in the drawings:
1. a workpiece carburizing production line; 10. a push-disk carburizing furnace; 11. a discharge hole of the carburizing furnace; 12. sealing the furnace door; 13. a discharging mechanism of the carburizing furnace; 20. a quenching chamber; 21. sealing the front chamber; 22. a discharge chamber; 23. a quenching tank; 24. a quenching elevator; 25. a quenching lifting platform; 251. a quenching platform; 252. a frame body; 26. a transfer platform; 27. transferring a push chain; 28. a discharge elevator; 29 a discharge lifting platform; 291 a discharge platform; 292. a frame body; 201. a gas barrier; 202. an isolation door lifting mechanism; 30. a push-plate type slow cooling furnace; 31. a furnace body; 311. a slow cooling space; 312. slowly cooling the feed inlet; 313. slowly cooling the discharge hole; 32. a guide chain moving mechanism; 321 A C-shaped groove rail; 3211. a groove rail; 322. a fixing groove; 323. guiding a chain; 324. pulling the stub bar; 325. a reciprocating drive motor; 33. a gas circulation mechanism; 331. a circulation fan; 332. a wind guide top plate; 333. a wind guide side plate; 34. a heat preservation mechanism; 35. a cooling mechanism; 351. a serpentine tube array; 352. a heat dissipating fin; 36. a slow cooling discharge air exchange chamber; 37. an exhaust gas discharge mechanism; 38. a shielding gas inlet mechanism; 39. a slow cooling furnace discharging mechanism; 301. an explosion-proof pressure relief device; and A, workpiece.
Detailed Description
The following detailed description and technical contents of the present invention are described with reference to the drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.
Fig. 1 to 6 are schematic diagrams of an embodiment of a workpiece carburizing production line with quenching and slow cooling functions according to the present invention. The workpiece carburizing production line 1 (hereinafter referred to as workpiece carburizing production line 1) with both quenching and slow cooling functions comprises a push-disk carburizing furnace 10, a quenching chamber 20 and a push-disk slow cooling furnace 30. Wherein, a discharging port 11 of the carburizing furnace 10 of the push-plate carburizing furnace is communicated with one side of a sealing front chamber 21 of the quenching chamber 20, the discharging port 11 of the carburizing furnace is provided with a sealing furnace door 12, and a discharging mechanism 13 of the carburizing furnace is arranged on the side wall of the push-plate carburizing furnace 10 opposite to the discharging port 11 of the carburizing furnace. As shown in fig. 7, the quenching chamber 20 in the workpiece carburizing production line 1 of the present invention is a quenching chamber with a special structure, the quenching chamber 20 mainly includes a sealed front chamber 21, a discharge chamber 22, a quenching tank 23 and a workpiece quenching moving mechanism, wherein the sealed front chamber 21 and the discharge chamber 22 are arranged above the quenching tank 23 side by side, the lower parts of the sealed front chamber 21 and the discharge chamber 22 are both communicated with the quenching tank 23, a quenching medium is contained in the quenching tank 23, the quenching medium can be quenching oil or quenching salt, etc., the sealed front chamber 21 is isolated from the discharge chamber 22 by the quenching medium in the quenching tank 23, and the workpiece quenching moving mechanism of the quenching chamber 20 is arranged in the sealed front chamber 21, the discharge chamber 22 and the quenching tank 23. As shown in fig. 3 to 6, the push-plate slow cooling furnace 30 includes a furnace body 31, a guide chain moving mechanism 32, a gas circulating mechanism 33, a heat insulating mechanism 34, a cooling mechanism 35, a slow cooling discharge scavenging chamber 36, a waste gas discharging mechanism 37, a shielding gas inlet mechanism 38, and a slow cooling furnace discharge mechanism 39. The furnace body 31 is composed of a furnace shell (not shown) and a heat-insulating furnace lining (not shown), a slow cooling space 311 is formed inside the furnace body 31, the side walls at the two ends of the furnace body 31 are respectively provided with a slow cooling feed port 312 and a slow cooling discharge port 313 which are communicated with the slow cooling space 311 and are provided with a sealed furnace door (not shown), the guide chain moving mechanism 32 and the gas circulating mechanism 33 are both arranged in the furnace body 31 and are respectively positioned at the bottom and the top of the slow cooling space 311, the heat-insulating mechanism 34 and the cooling mechanism 35 are also both arranged in the furnace body 31 and are respectively positioned at one section of the slow cooling space 311 adjacent to the slow cooling feed port 312 and one section of the adjacent slow cooling discharge port 313, the slow cooling discharge air-exchange chamber 36 is arranged outside the slow cooling discharge port 313, the waste gas discharge mechanism 37 is arranged on the side wall of the furnace body 31 adjacent to the slow cooling feed port 312 and at the top of the slow cooling discharge air-exchange chamber 36, the protective gas intake mechanism 38 is arranged on the side wall of the furnace body 31 adjacent to the slow cooling discharge port 313 and is arranged at the lower part of the side wall of the slow cooling discharge chamber 36, the slow cooling furnace body 31 opposite to the slow cooling discharge port 313, the slow cooling discharge mechanism 39 is arranged on the side wall of the furnace body 31 opposite to the slow cooling discharge port 313, and the slow cooling discharge chamber 21 is communicated with the slow cooling chamber 21 connected with the slow cooling chamber 21 of the slow cooling chamber. In this embodiment, the push-plate carburizing furnace 10, the quenching chamber 20 and the push-plate slow cooling furnace 30 are all connected by seal welding, and all external connecting members on the above devices are connected by using seal structures, so as to ensure that the internal operating environment of the workpiece carburizing production line 1 does not contact with the outside air. The discharging mechanism 13 of the carburizing furnace and the discharging mechanism 39 of the slow cooling furnace can be a coiled chain pushing structure consisting of a coiled chain track, a chain, a driving motor, a chain wheel and a pushing head, so that the occupied space of the discharging mechanism can be saved. As shown in fig. 1 to 7, the discharging mechanism 13 of the carburizing furnace can selectively push the workpiece a processed by the push-disk carburizing furnace 10 to the workpiece quenching moving mechanism in the sealed front chamber 21 or the chain guide moving mechanism 32 in the push-disk slow cooling furnace 30, so that the workpiece quenching moving mechanism drives the workpiece a to perform quenching operation from the sealed front chamber 21 to the quenching tank 23, and then outputs the workpiece a through the discharging chamber 22, or the chain guide moving mechanism 32 drives a plurality of workpieces a stepwise in the slow cooling space 311 to perform slow cooling operation, and then the slow cooling furnace discharging mechanism 39 pushes the slowly cooled workpiece a into the slow cooling discharging ventilating chamber 36 to output the workpiece a.
Slow cooling ejection of compact scavenge chamber 36 in this embodiment is prior art, and it is very extensive to use in the work piece thermal treatment field, this slow cooling ejection of compact scavenge chamber 36 has the space of taking a breath of relative seal, discharge mechanism and still be provided with the fire curtain under the discharge gate usually and be used for the entering of isolated outside air, this slow cooling ejection of compact scavenge chamber can prevent effectively that outside air from getting into push away dish formula slow cooling stove through exhaust emission mechanism and protective gas air intake mechanism's coordinated operation in the slow cooling ejection of compact scavenge chamber ejection of compact in-process, consequently, the security of push away dish formula slow cooling stove discharge end has greatly been ensured. The sealing oven doors installed on the carburizing oven discharge port 11, the slow cooling feed port 312 and the slow cooling discharge port 313 in the embodiment are lifting sealing oven doors which are composed of a lifting motor, a gear, a rack, a chain, a guide channel steel and a guide bearing, and the sealing oven doors are sealed by pressing packing. In addition, in the embodiment, the air intake mode of the air intake pipeline of the protective air intake mechanism 38 is divided into a constant mode and a large flow mode, the constant mode is used for maintaining the positive pressure in the furnace, and the large flow mode is used for quickly diluting the carburizing atmosphere entering the push-disk slow cooling furnace when the sealing furnace door is closed or quickly replacing the air entering the slow cooling discharge ventilation chamber. And the outside discharge pipe way of exhaust emission mechanism 37 then has the pressure retaining valve of taking the counter weight, so that the waste gas in push away the interior of dish formula slow cooling stove and slow cooling ejection of compact scavenging needs just can outwards discharge according to the stove pressure of setting for, and the pressure retaining valve is one-way structure, reverse unable opening, thereby make outside air can't be inside via the pressure retaining valve access device, the discharge port of outside discharge pipe way still has the ignition nozzle of taking combustion-supporting atmosphere simultaneously, in order to light the processing to the combustible atmosphere who discharges out, thereby the waste gas that makes the emission reaches the environmental protection requirement.
Specifically, as shown in fig. 7, the workpiece quenching moving mechanism includes a quenching lifter 24, a quenching lifter 25, a transfer table 26, a transfer chain 27, a discharge lifter 28, and a discharge lifter 29. Wherein, the quenching lifter 25 is arranged on the outer side surface of the top wall of the sealing front chamber 21, and the lifting driving end thereof vertically penetrates through the top wall of the sealing front chamber 21 downwards and is positioned in the sealing front chamber 21. The quenching lifting platform 25 is arranged in the sealed front chamber 21 and can move up and down, the quenching lifting platform 25 consists of a quenching platform 251 and a frame body 252 arranged on the upper part of the quenching platform 251 in a surrounding way, the quenching platform 251 is flush with the bottom of the sealed front chamber 21 in an initial state, and the lifting driving end of the quenching lifting machine 24 is fixedly connected with the top of the frame body 252 of the quenching lifting platform 25. The transfer platform 26 is horizontally disposed in the quenching tank 23, and corresponding slots (not shown) are disposed corresponding to the quenching lifting platform 25 and the discharging lifting platform 29. The transfer push chain 27 is composed of an L-shaped chain guide plate, a chain, a driving motor and a driving wheel, the L-shaped chain guide plate is installed outside the sealing front chamber 21, the vertical section of the L-shaped chain guide plate penetrates through the quenching tank 23, the horizontal section of the L-shaped chain guide plate abuts against the upper side face of the transfer platform 26, the chain is movably embedded in the L-shaped chain guide plate, the driving motor is installed above the quenching tank 23 and located beside the L-shaped chain guide plate, and the driving wheel is installed at the driving end of the driving motor and is in meshed driving connection with the chain. The discharging elevator 28 is installed on the outer side surface of the top wall of the discharging chamber 22, and the elevating driving end of the discharging elevator vertically penetrates through the top wall of the discharging chamber 22 downwards and is located in the discharging chamber 22. The discharging lifting platform 29 is arranged in the discharging chamber 22 and can move up and down, the discharging lifting platform 29 is composed of a discharging platform 291 and a frame 292 arranged on the discharging platform 291 in an enclosing mode, and the lifting driving end of the discharging lifting machine 28 is fixedly connected with the top of the frame 292 of the discharging lifting platform 29. After the discharging mechanism 13 of the carburizing furnace pushes the workpiece a to the quenching platform 251, the quenching lifting platform 25 is driven by the quenching lifter 24 to descend to the slot position corresponding to the transfer platform 26 and the quenching platform 251 is flush with the upper side surface of the transfer platform 26, at this time, the workpiece a performs quenching operation in the quenching medium, after the quenching of the workpiece a is completed, the workpiece a is pushed to the discharging platform 291 of the discharging lifting platform 29 which descends to the slot position corresponding to the transfer platform 26 by the driving motor driving chain of the transfer push chain 27, and then the discharging lifting platform 29 is driven by the discharging lifter 28 to be lifted to the discharging chamber 22 to output the workpiece a. The quenching chamber 20 physically isolates the sealed front chamber 21 from the discharge chamber 22 through a quenching medium, so that air is effectively prevented from entering the sealed front chamber 21 from the discharge end, quenching steam generated after quenching of the workpiece A can be prevented from being diffused to the outside of the quenching chamber 20 through the discharge chamber 22 to cause loss of the quenching medium and environmental pollution, therefore, the special structure of the quenching chamber 20 can prevent the carburization atmosphere and the air from being mixed to cause explosion, the running safety of the quenching chamber 20 is improved, the workpiece A can be prevented from being oxidized by oxygen in the air, the quenching quality of the workpiece A is ensured, the loss of the quenching steam can be prevented, and the investment of material cost is reduced.
In addition, as shown in fig. 7, the quenching chamber 20 may further include a gas barrier 201, a partition door lifting mechanism 202, an exhaust gas outlet (not shown), and a shielding gas inlet (not shown). The gas barrier 201 is vertically arranged at the upper part in the quenching tank 23 and is positioned between the sealing front chamber 21 and the discharging chamber 22, and the lower end part of the gas barrier 201 is inserted below the liquid level of the quenching medium in the quenching tank 23 so as to isolate the upper part of the liquid level of the quenching medium in the quenching tank 23. The isolating door lifting mechanism 202 comprises an isolating door, a lifting motor and an isolating plate, the isolating door is vertical to the quenching tank 23 which is arranged between the sealed front chamber 21 and the discharge chamber 22 and can move up and down, the lifting motor is arranged above the quenching tank 23 and is positioned beside the isolating door and is in driving connection with the isolating door, the isolating plate is vertical to the position corresponding to the isolating door and is arranged below the transfer platform 26, the lifting motor can drive the isolating door to move down and abut against the transfer platform 26, so that the isolating door and the isolating plate separate the quenching tank 23 into a quenching area and a discharge area. The exhaust gas outlet and the shielding gas inlet are provided in the seal front chamber 21. The arrangement of the air baffle 201 and the isolation door lifting mechanism 202 can further prevent the outside air from entering the sealed antechamber 21 from the discharging chamber 22, and can prevent the quenching steam from streaming to the discharging chamber 22 from the sealed antechamber 21; and the arrangement of the waste gas discharge port and the protective gas inlet can effectively reduce the influence of the carburizing atmosphere on the subsequent process.
Further, as shown in fig. 4, the push-pan carburizing furnace 10, the quenching chamber 20 and the push-pan type slow cooling furnace 30 are all provided with two parallel guide rails (not shown and only shown) connected to each other for facilitating the pushing and transferring of the workpiece a between the devices of the workpiece carburizing line 1, wherein the guide rails in the push-pan carburizing furnace 10 are generally made of silicon carbide guide rails or heat-resistant steel guide rails, and the guide rails in the quenching chamber 20 and the push-pan type slow cooling furnace 30 are made of heat-resistant steel guide rails. The guide rails of the quenching chamber 20 are arranged on the quenching platform and the discharging platform.
In this embodiment, as shown in fig. 8 and 9, the chain guiding mechanism 32 is disposed between two parallel guide rails at the bottom of the slow cooling space 311 along the direction from the slow cooling inlet 312 to the slow cooling outlet 313. The guide chain moving mechanism 32 includes a plurality of C-shaped groove rails 321, a plurality of fixing grooves 322, a guide chain 323, a material pulling head 324 and a reciprocating driving motor 325, which are sequentially assembled and formed by a plurality of groove rails 3211, wherein the plurality of groove rails 3211 include a plurality of linear groove rails (not shown in the figure, the partial groove rails are located at positions parallel to the bottom of the slow cooling space 311) and a plurality of arc groove rails (not shown in the figure, the partial groove rails are located at the turning positions of the C-shaped groove rails 321). As shown in fig. 9, each of the groove rails 3211 is formed by two channel steels that are opposite to each other in the notch and are spaced apart from each other, and the C-shaped groove rail 321 is disposed between two parallel guide rails at the bottom of the slow cooling space 311. The plurality of fixing grooves 322 are fixedly disposed at the inner side of the C-shaped groove rail 321 at the same interval corresponding to the plurality of groove rails 3211, and each groove rail 3211 is fixedly embedded in the notch of each fixing groove 322. The guide chain 323 is movably embedded in the C-shaped groove rail 321. The pulling head 324 is fixedly combined on the upper side of the guide chain 323 adjacent to the slow cooling feed inlet 312 and exposed out of the upper side of the C-shaped groove rail 321. The reciprocating driving motor 325 is installed at the bottom of the furnace body 31 and the driving end thereof is engaged and driven with the guide chain 323 through a sprocket. The structure strength of the guide chain moving mechanism 32 can be effectively enhanced through the coating support structure of the guide chain 323 by the C-shaped groove rail 321 and the fixing groove 322, so that the carrying capacity of the guide chain moving mechanism 32 is improved; because the height difference exists between the guide rail at the bottom in the slow cooling space 311 and the guide chain moving mechanism 32, the workpiece a pushed into the slow cooling space 311 is placed on the guide rail, and the reciprocating driving motor 325 drives the guide chain 323 in the C-shaped groove rail 321 to drive the material pulling head 324 to move in a reciprocating manner, so that the workpiece a fed through the slow cooling feed port 312 is pushed by the material pulling head 324 to move against the workpiece a in front, and therefore, a plurality of workpieces a in the slow cooling space 311 move in a stepping moving manner along the guide rail one by one to the direction of the slow cooling discharge port 313, and the conveying structure with the workpieces a being close to each other can effectively reduce the size of an open closed space in the slow cooling space 311, thereby effectively reducing the possibility of explosion or explosion of the push tray type slow cooling furnace 30; in addition, the in-furnace workpiece conveying mechanism mainly composed of the C-shaped groove rail 321, the guide chain 323 and the reciprocating drive motor 325 can also effectively reduce the complexity of the mechanism and reduce the occupation of the bottom space of the push-plate type slow cooling furnace 30.
In the present embodiment, as shown in fig. 3, 5 and 6, the air circulation mechanism 33 is composed of a plurality of circulation fans 331, an air guide top plate 332 and two air guide side plates 333. The plurality of circulation fans 331 are disposed at the top of the slow cooling space 311 along the direction from the slow cooling inlet 312 to the slow cooling outlet 313 at equal intervals. The top air guide plate 332 is provided with a plurality of fan holes (not shown) corresponding to the plurality of circulating fans 331, and the top air guide plate 332 is horizontally disposed on the top of the slow cooling space 311 and the fan holes are correspondingly sleeved on the circulating fans 331. The two air guide side plates 333 are vertically arranged in the slow cooling space 311 and located at two sides of the two parallel guide rails, and upper side edges of the two air guide side plates 333 are respectively combined and fixed with two side edges of the air guide top plate 332. The air flow generated by the circulating fan 331 is guided by the air guide top plate 332 and the air guide side plate 333 to flow orderly and rapidly in a fixed direction, so that the slow cooling uniformity of the workpiece is ensured, and the quality of the product is improved.
In this embodiment, as shown in fig. 5, the heat-insulating mechanism 34 is composed of a plurality of heating elements, and the plurality of heating elements are disposed in a section of the slow cooling space 311 adjacent to the slow cooling feed port 312 and respectively located between two sidewalls of the furnace body 31 and the two air guiding side plates 333. As shown in fig. 6 and 10, the cooling mechanism 35 is composed of a plurality of serpentine tubes 351 and a plurality of heat dissipation fins 352 sleeved on the serpentine tubes 351, the serpentine tubes 351 are disposed at a section of the slow cooling space 311 adjacent to the slow cooling discharge port 313 and are respectively located between the two side walls of the furnace body 31 and the two air guide side plates 333, and the cooling circulation medium flowing in the cooling mechanism 35 is liquid high-efficiency cooling oil, which has a higher vaporization temperature than cooling water, so that the problem of cooling tube bursting caused by liquid vaporization in an abnormal situation can be reduced. In this embodiment, the circulation of cooling oil adopts closed circulation among the cooling body, and the circulation system has the oil supplementing barrel, and oil circulation leans on two different circulating oil pumps of size, and big oil pump is used for the work piece to cool off fast, and the little oil pump is used for even cooling. The heat-preserving mechanism 34 and the cooling mechanism 35 divide the slow cooling space 311 into a heat-preserving section and a cooling section, so that the slow cooling operation is performed according to the process requirement of slow cooling (firstly heating, preserving heat, and then cooling) when the workpiece a moves in the slow cooling space 311.
In this embodiment, the workpiece carburizing production line 1 further includes two explosion-proof pressure relief devices 301, and each explosion-proof pressure relief device 301 is composed of a flange, an explosion-proof film, a heat insulation layer and a protection plate. The explosion-proof membrane is arranged in a flange hole of the flange, the heat-insulating layer is arranged at the bottom of the flange, and the protection plate is arranged at the top of the flange. The top of the furnace body 31 and the top of the slow cooling discharge ventilation chamber 36 are both provided with explosion-proof pressure relief ports (not shown), and the two explosion-proof pressure relief devices 301 are respectively fixed on the explosion-proof pressure relief ports of the furnace body 31 and the slow cooling discharge ventilation chamber 36 by flanges. This explosion-proof pressure relief device 301 can regard as under the extreme uncontrollable condition, if the air gets into in the push disk slow cooling stove with under the circumstances that the atmosphere mixes and produces local detonation, carries out the safety device of urgent pressure relief to push disk slow cooling stove, and wherein the setting of this guard plate can effectively prevent that the interior object departure of stove from causing accidental injury. In addition, an access door (not shown) which is communicated with the slow cooling space 311 and is provided with an observation window is further arranged on the furnace body of the push-plate type slow cooling furnace 30, so that an operator can maintain the push-plate type slow cooling furnace during the stop of the workpiece carburizing production line.
The workpiece carburizing production line of the invention also has another embodiment, not shown, the device structure in the other embodiment is the same as the above embodiment, but the difference is that the workpiece carburizing production line can also comprise a plurality of thermocouples, a workpiece limiting mechanism and a central control unit. Wherein, the plurality of thermocouples are arranged in the slow cooling space. The workpiece limiting mechanism is composed of a limiting rod, an elastic reset piece and a travel switch, the limiting rod is movably arranged on the side wall of the furnace body opposite to the slow cooling feed port, the elastic reset piece is arranged on the limiting rod, and the travel switch is arranged on the outer side of the furnace body and can be contacted by the limiting rod in a moving mode. The central control unit is respectively electrically connected with the thermocouples, the travel switch, the sealed furnace door of the discharge port of the carburizing furnace, the discharging mechanism of the carburizing furnace, the quenching moving mechanism of the workpiece, the sealed furnace doors of the slow cooling feed port and the slow cooling discharge port, the guide chain moving mechanism, the gas circulation mechanism, the heat preservation mechanism, the cooling mechanism, the slow cooling discharge scavenging chamber, the waste gas discharge mechanism, the protective gas inlet mechanism and the slow cooling furnace discharging mechanism. The workpiece limiting mechanism can ensure that the carburized workpiece is accurately pushed to the workpiece feeding position (namely the specified position of the guide rail) in the push disc type slow cooling furnace by the discharging mechanism of the carburizing furnace. The central control unit may be composed of a programmable logic control circuit (PLC) or a centralized control circuit, and in view of the fact that the conventional programmable logic control circuit or centralized control circuit is used to control the operation states of the devices (such as the push-plate carburizing furnace, the quenching chamber and the push-plate type slow cooling furnace) according to the detection data and/or the set process implementation steps of the related sensors (such as the thermocouple, the furnace pressure detector, the travel switch and the like), the present invention is a very widely and generally applied control method in the field of automatic control, which is the conventional control technology, and therefore, the operation process of the central control unit used in the present invention for controlling the above components is not described again. Therefore, through the centralized control of the central control unit, the full-automatic operation of the workpiece carburizing production line can be realized, and the investment of labor cost is saved. In addition, in order to improve the production safety, a furnace pressure detector electrically connected with the central control unit can be arranged in the push-plate type slow cooling furnace and the slow cooling discharge air exchange chamber, so that the protective gas inlet mechanism is controlled to supplement protective gas when the furnace pressure is reduced, and the positive pressure in the furnace is maintained.
In addition, the invention also provides a workpiece heat treatment method, which comprises the following steps:
carburizing operation: carrying out carburizing treatment on a plurality of workpieces in a push disc carburizing furnace;
selective operation of subsequent processes: according to the subsequent process requirements, the carburizing furnace discharge mechanism of the push disc carburizing furnace pushes the carburized workpieces to a sealed front chamber of a quenching chamber hermetically connected with a discharge port of the carburizing furnace of the push disc carburizing furnace one by one for quenching operation, or pushes the carburized workpieces to a workpiece feeding position of a push disc type slow cooling furnace hermetically connected with the sealed front chamber through the sealed front chamber one by one for slow cooling operation, or selectively pushes the carburized workpieces to the sealed front chamber or the workpiece feeding position for crossed quenching operation or slow cooling operation;
quenching operation: the workpiece positioned in the sealing front chamber is driven by the workpiece quenching moving mechanism to descend into the quenching tank for quenching, and then is driven by the workpiece quenching moving mechanism to ascend to a discharge chamber hermetically isolated from the sealing front chamber for outputting the workpiece;
slow cooling operation: the workpiece on the workpiece feeding level is driven by the guide chain moving mechanism to leave the workpiece feeding level and move in a stepping mode towards the slow cooling discharge hole, meanwhile, the workpiece feeding level is pushed into the next workpiece to be slowly cooled, protective gas is injected into the push disc type slow cooling furnace through the protective gas inlet mechanism arranged close to the slow cooling discharge hole, the flowing direction of the protective gas is opposite to the moving direction of the workpiece, so that the protective gas dilutes the carburizing atmosphere at the workpiece feeding level and is discharged out of the push disc type slow cooling furnace through the waste gas discharge mechanism arranged close to the slow cooling feed hole, and the workpiece is firstly insulated by the heat insulation mechanism in the moving process, then is cooled by the cooling mechanism and then is pushed to the slow cooling discharge scavenging chamber through the slow cooling furnace discharge mechanism to output the workpiece.
By the workpiece heat treatment method, the workpiece after carburization can be subjected to selective quenching or slow cooling process operation, and mass production of the workpiece slow cooling process is realized in a safe atmosphere environment for preventing air from entering, so that the heat treatment efficiency and quality of the workpiece are improved.
Accordingly, the operation process of the workpiece carburizing production line of the invention is roughly as follows: a sealed furnace door at a discharge port of the carburizing furnace is opened, a discharging mechanism of the carburizing furnace pushes a workpiece after carburizing treatment out of the pusher-tray carburizing furnace along a guide rail according to the setting of a process flow, when the process flow is set as a quenching process, the discharging mechanism of the carburizing furnace pushes the workpiece after carburizing treatment into a sealed front chamber of a quenching chamber, the discharging mechanism of the carburizing furnace retracts, the sealed furnace door at the discharge port of the carburizing furnace is closed, the workpiece quenching moving mechanism drives the workpiece to descend into a quenching medium in a quenching tank for quenching, then the workpiece is transferred to a discharging platform, and a discharging lifter drives the discharging platform to ascend to the discharging chamber to output the workpiece after quenching; when the process flow is set as a slow cooling process, a carburizing furnace discharging mechanism pushes a workpiece after carburization treatment to a sealed front chamber of a quenching chamber, a sealed furnace door of a slow cooling feed port of a push-plate type slow cooling furnace is opened, the carburizing furnace discharging mechanism continues to push the workpiece to a workpiece feeding position in a slow cooling space, then the carburizing furnace discharging mechanism is retracted, a sealed furnace door of the carburizing furnace discharge port and the slow cooling feed port is closed, a guide chain moving mechanism drives the workpiece to move step by step in the slow cooling space, and when a workpiece position moves towards the slow cooling discharge port, the workpiece feeding position is fed with a workpiece to be slowly cooled, the workpiece is firstly kept warm by a heat preservation section heat preservation mechanism and then cooled by a cooling section cooling mechanism, in the whole workpiece slow cooling process, a gas circulation mechanism ensures the circulation of the atmosphere in the slow cooling space, a protective gas intake mechanism and a waste gas exhaust mechanism maintain the slow cooling atmosphere (dilute and remove positive pressure), when the workpiece moves to the slow cooling discharge port, the sealed furnace discharge port is opened, the slow cooling furnace discharging mechanism pushes the workpiece after the slow cooling treatment to the slow cooling furnace discharge port, and then the workpiece is pushed into the sealed slow cooling furnace discharge chamber to be closed, and the workpiece is discharged. In addition, the workpieces are placed on the charging trays to move on the guide rails of each device, and the arrangement number of the charging trays in the workpiece carburizing production line is determined according to the process requirement, the slow cooling speed and the whole production line discharging period.
In conclusion, in the workpiece carburizing production line, the push-disk carburizing furnace, the quenching chamber and the push-disk type slow cooling furnace are sequentially and hermetically connected according to the workpiece heat treatment process flow, the sealed front chamber of the quenching chamber is used as a 'transfer platform', a workpiece carburized by the push-disk carburizing furnace can be pushed to the sealed front chamber by the carburizing furnace discharge mechanism to implement a quenching process, and can also be pushed to the slow cooling space of the push-disk type slow cooling furnace by the carburizing furnace discharge mechanism through the sealed front chamber to implement a slow cooling process, and the workpiece carburizing production line can simultaneously meet various process procedures by the selective operation, so that the cost investment of production equipment is reduced, and the production land is saved; and push away the operation of the slow cooling of dish formula slow cooling stove can satisfy several work pieces in the slow cooling space simultaneously, and the transport structure that several work pieces are closely close to still can reduce the volume of airtight space in the slow cooling space to this mass production that not only can realize the work piece improves the production efficiency of work piece carburization production line, still can reduce the risk of exploding. In addition, before the quenching process is implemented and in the slow cooling process, the workpiece is required to be incapable of high-temperature oxidation, and in the process of transferring the workpiece to a sealed front chamber or a slow cooling space, the carburizing atmosphere in the push disc carburizing furnace inevitably enters the quenching chamber and the push disc slow cooling furnace, because the carburizing atmosphere contains a large amount of hydrogen and carbon monoxide atmosphere, and the temperature in the push disc slow cooling furnace is reduced from about 900 ℃ to about 100 ℃ in the slow cooling process, the temperature is gradually lower than the explosion safety temperature of 750 ℃, and because the slow cooling operation of a plurality of workpieces is simultaneously implemented in the push disc slow cooling furnace, the size of the sealed space is larger, and sparks are inevitably generated in the transfer process of the workpiece, therefore, in order to prevent the carburized workpiece from being oxidized in the subsequent process, the explosion danger caused by the fact that a small amount of air enters the push disc slow cooling furnace is further prevented, the quenching chamber of the technical scheme is provided with the sealed front chamber and the discharge chamber arranged at the upper part of the quenching tank, and the sealed medium is physically isolated from the discharge chamber by the quenching chamber, so as to effectively prevent the air from entering the production line of the workpiece; the slow cooling discharge air exchange chamber arranged outside the slow cooling discharge port of the push-disc slow cooling furnace can also effectively prevent air from entering a workpiece carburizing production line through the discharge end of the push-disc slow cooling furnace; furthermore, the waste gas discharge mechanism and the protective gas inlet mechanism are respectively arranged on the side wall of the furnace body close to the slow cooling feed port and the slow cooling discharge port, so that protective gas (generally nitrogen) can flow from the slow cooling discharge port to the slow cooling feed port, namely, the protective gas flows from the low-temperature section to the high-temperature section (the low-temperature section has greater explosion danger due to the temperature being lower than the explosion safety temperature of 750 ℃), thereby effectively avoiding the explosion danger of the push-plate slow cooling furnace, and further maintaining the furnace pressure in the push-plate slow cooling furnace.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalent changes made by applying the patent concepts of the present invention should fall within the scope of the present invention.
Claims (10)
1. A workpiece carburizing production line with quenching and slow cooling functions comprises: a push-disk carburizing furnace and a quenching chamber; a discharge port of the carburizing furnace of the push-plate carburizing furnace is communicated with one side of a sealing front chamber of the quenching chamber, a sealing furnace door is arranged at the discharge port of the carburizing furnace, and a discharging mechanism of the carburizing furnace is arranged on the side wall of the push-plate carburizing furnace opposite to the discharge port of the carburizing furnace; the quenching chamber includes: the sealing front chamber, the discharging chamber, the quenching tank and the workpiece quenching moving mechanism are arranged above the quenching tank and are communicated with the quenching tank, and the workpiece quenching moving mechanism is arranged in the sealing front chamber, the discharging chamber and the quenching tank; it is characterized by also comprising: push away disk slow cooling furnace, push away disk slow cooling furnace includes: the furnace comprises a furnace body, a guide chain moving mechanism, a gas circulating mechanism, a heat insulating mechanism, a cooling mechanism, a slow cooling discharge scavenging chamber, a waste gas discharge mechanism, a protective gas inlet mechanism and a slow cooling furnace discharge mechanism, wherein a slow cooling space is formed inside the furnace body, the side walls at two ends of the furnace body are respectively provided with a slow cooling feed inlet and a slow cooling discharge outlet which are communicated with the slow cooling space and are provided with a sealed furnace door, the guide chain moving mechanism and the gas circulating mechanism are arranged in the furnace body and are respectively positioned at the bottom and the top of the slow cooling space, the heat insulating mechanism and the cooling mechanism are both arranged in the furnace body and are respectively positioned at one section adjacent to the slow cooling feed inlet in the slow cooling space and one section adjacent to the slow cooling discharge outlet, the slow cooling discharge scavenging chamber is arranged outside the slow cooling discharge outlet, the waste gas discharge mechanism and the protective gas inlet mechanism are respectively arranged on the side wall of the furnace body close to the slow cooling discharge inlet and the slow cooling discharge chamber and are respectively communicated with the slow cooling space and the slow cooling discharge chamber, the slow cooling discharge outlet is arranged on the side wall of the slow cooling furnace body, and is connected with the slow cooling discharge outlet of the slow cooling furnace body, and the side wall of the slow cooling furnace body; the carburizing furnace discharging mechanism can selectively push the workpiece processed by the push-disk carburizing furnace to the workpiece quenching moving mechanism in the sealed front chamber or the guide chain moving mechanism in the push-disk slow cooling furnace, so that the workpiece quenching moving mechanism drives the workpiece to be quenched from the sealed front chamber to the quenching tank, and then the workpiece is output through the discharging chamber, or the guide chain moving mechanism drives a plurality of workpieces to be slowly cooled in the slow cooling space in a stepping mode, and then the slowly cooled workpiece is pushed into the slow cooling discharging ventilation chamber by the slow cooling furnace discharging mechanism to be output.
2. The workpiece carburizing production line according to claim 1, characterized in that the workpiece quenching moving mechanism includes: the device comprises a quenching lifter, a transfer platform, a transfer push chain, a discharging lifter and a discharging lifter; the quenching lifter is arranged on the outer side surface of the top wall of the sealed front chamber, and the lifting driving end of the quenching lifter vertically penetrates through the top wall of the sealed front chamber downwards and is positioned in the sealed front chamber; the quenching lifting platform can be vertically moved and is arranged in the sealed front chamber and consists of a quenching platform and a frame body which is arranged on the upper part of the quenching platform in a surrounding way, the quenching platform is flush with the bottom of the sealed front chamber in the initial state, and the lifting driving end of the quenching lifting machine is fixedly connected with the top of the frame body of the quenching lifting platform; the transfer platform is horizontally arranged in the quenching tank and is provided with a tank position corresponding to the quenching lifting platform and the discharging lifting platform; the transfer push chain is composed of an L-shaped chain guide plate, a chain, a driving motor and a driving wheel, the L-shaped chain guide plate is arranged outside the sealing front chamber, a vertical section of the L-shaped chain guide plate penetrates into the quenching groove, a horizontal section of the L-shaped chain guide plate abuts against the upper side face of the transfer platform, the chain is movably embedded in the L-shaped chain guide plate, the driving motor is arranged above the quenching groove and located at the side of the L-shaped chain guide plate, and the driving wheel is arranged at the driving end of the driving motor and is in meshed driving connection with the chain; the discharging lifter is arranged on the outer side surface of the top wall of the discharging chamber, and the lifting driving end of the discharging lifter vertically penetrates through the top wall of the discharging chamber downwards and is positioned in the discharging chamber; the discharging lifting platform can be vertically moved and is arranged in the discharging chamber, the discharging lifting platform consists of a discharging platform and a frame body which is arranged on the upper part of the discharging platform in a surrounding manner, and a lifting driving end of the discharging lifting machine is fixedly connected with the top of the frame body of the discharging lifting platform; the work piece is pushed to the quenching platform by the discharging mechanism of the carburizing furnace, the quenching lifting platform is driven by the quenching lifting machine to descend to the groove position corresponding to the transfer platform, the quenching platform is flush with the upper side surface of the transfer platform, then the work piece is pushed to the discharging platform of the discharging lifting platform descending to the groove position corresponding to the transfer platform by the driving motor of the transfer push chain, and then the discharging lifting platform is driven by the discharging lifting machine to be lifted to the discharging chamber to output the work piece.
3. The workpiece carburizing production line according to claim 2, characterized in that the quenching chamber further includes: the device comprises a gas baffle, an isolating door lifting mechanism, a waste gas discharge port and a protective gas inlet; the gas barrier is vertically arranged at the upper part in the quenching tank and positioned between the sealing front chamber and the discharging chamber, and the lower end part of the gas barrier is inserted below the liquid level of the quenching medium in the quenching tank so as to isolate the upper part of the liquid level of the quenching medium in the quenching tank; isolation door elevating system includes: the device comprises a sealing front chamber, a sealing rear chamber, a lifting motor and a partition plate, wherein the sealing front chamber and the sealing rear chamber are arranged in a sealed manner, the sealing front chamber is arranged in the sealing front chamber, the sealing rear chamber is arranged in the sealed rear chamber, the partition plate is arranged above the sealing rear chamber, is positioned beside the partition door and is in driving connection with the partition door, the partition plate is arranged below a transfer platform in a vertical direction and corresponds to the position of the partition door, and the lifting motor can drive the partition door to move downwards to abut against the transfer platform so that the partition door and the partition plate can divide the sealing rear chamber into a sealing area and a discharging area; the waste gas discharge port and the shielding gas inlet are both arranged in the sealing front chamber.
4. The workpiece carburizing production line according to claim 1, wherein the push-disk carburizing furnace, the quenching chamber and the push-disk slow cooling furnace are all provided with two parallel guide rails connected with each other; lead chain moving mechanism is along slow cooling feed inlet to the direction of slow cooling discharge gate and set up in between two parallel guide of slow cooling space bottom, just it includes to lead chain moving mechanism: the device comprises a C-shaped grooved rail, a plurality of fixing grooves, a guide chain, a material pulling head and a reciprocating drive motor, wherein the C-shaped grooved rail is formed by assembling a plurality of sections of grooved rails in sequence, each grooved rail is formed by oppositely arranging two channel steel with notches of the two channel steel at intervals, the C-shaped grooved rail is arranged between two parallel guide rails at the bottom of a slow cooling space, the plurality of fixing grooves correspond to the plurality of sections of grooved rails, the fixing grooves are fixedly arranged on the inner side of the C-shaped grooved rail at the same intervals, the grooved rails are fixedly embedded in the notches of the fixing grooves respectively, the guide chain is movably embedded in the C-shaped grooved rail, the material pulling head is fixedly combined on the upper side face of the guide chain close to the slow cooling feed port and is exposed out of the upper side of the C-shaped grooved rail, the reciprocating drive motor is arranged at the bottom of the furnace body, and the drive end of the reciprocating drive motor is in meshed drive connection with the guide chain through a chain wheel.
5. The workpiece carburizing production line according to claim 4, wherein the gas circulation mechanism is composed of a plurality of circulation fans, a wind guide top plate and two wind guide side plates, the plurality of circulation fans are arranged at the top of the slow cooling space at equal intervals along the direction from the slow cooling feed port to the slow cooling discharge port, the wind guide top plate is provided with a plurality of fan holes corresponding to the plurality of circulation fans, the wind guide top plate is horizontally arranged at the top of the slow cooling space and enables the fan holes to be correspondingly sleeved with the circulation fans, the two wind guide side plates are vertically arranged in the slow cooling space and located at two sides of the two parallel guide rails, and upper side edges of the two wind guide side plates are respectively combined and fixed with two side edges of the wind guide top plate.
6. The workpiece carburizing production line according to claim 5, wherein the heat retaining mechanism is composed of a plurality of heating elements, and the plurality of heating elements are arranged in a section of the slow cooling space adjacent to the slow cooling feed inlet and respectively located between two side walls of the furnace body and the two air guide side plates; the cooling mechanism is composed of a plurality of snakelike tubes and a plurality of radiating fins sleeved on the snakelike tubes, and the snakelike tubes are arranged in a section, adjacent to the slow cooling discharge port, in the slow cooling space and respectively located between two side walls of the furnace body and the two air guide side plates; the heat preservation mechanism and the cooling mechanism divide the slow cooling space into a heat preservation section and a cooling section.
7. The workpiece carburizing production line according to claim 1, characterized by further comprising: the anti-explosion pressure relief device comprises a flange, an anti-explosion film, a heat preservation layer and a protection plate, wherein the anti-explosion film is arranged in a flange hole of the flange, the heat preservation layer is arranged at the bottom of the flange, the protection plate is arranged at the top of the flange, anti-explosion pressure relief openings are formed in the top of the furnace body and the top of the slow cooling discharge ventilation chamber, and the two anti-explosion pressure relief devices are fixedly arranged on the anti-explosion pressure relief openings of the furnace body and the slow cooling discharge ventilation chamber through the flange.
8. The workpiece carburizing production line according to claim 1, wherein the carburizing furnace discharging mechanism and the slow cooling furnace discharging mechanism are each a coiled chain pushing structure composed of a coiled chain track, a chain, a driving motor, a chain wheel and a pushing head.
9. The workpiece carburizing production line of claim 1, further comprising: a plurality of thermocouples, a workpiece limiting mechanism and a central control unit; the thermocouples are arranged in the slow cooling space; the workpiece limiting mechanism is composed of a limiting rod, an elastic reset piece and a travel switch, the limiting rod is movably arranged on the side wall of the furnace body opposite to the slow cooling feed inlet, the elastic reset piece is arranged on the limiting rod, and the travel switch is arranged on the outer side of the furnace body and can be movably contacted with the limiting rod; the central control unit is respectively and electrically connected with the plurality of thermocouples, the travel switch, a sealing furnace door of a discharge port of the carburizing furnace, a discharging mechanism of the carburizing furnace, a workpiece quenching moving mechanism, a sealing furnace door of a slow cooling feed port and a slow cooling discharge port, a guide chain moving mechanism, a gas circulation mechanism, a heat preservation mechanism, a cooling mechanism, a slow cooling discharge scavenging chamber, a waste gas discharge mechanism, a protective gas inlet mechanism and a slow cooling furnace discharging mechanism.
10. A method of heat treating a workpiece, comprising the steps of:
carburizing operation: carrying out carburizing treatment on a plurality of workpieces in a push disc carburizing furnace;
selective operation of subsequent processes: according to the subsequent process requirements, the carburization furnace discharge mechanism of the push-disk carburization furnace pushes the carburized workpieces one by one to a sealed front chamber of a quenching chamber hermetically connected with a discharge port of the carburization furnace of the push-disk carburization furnace for quenching operation, or pushes the carburized workpieces one by one through the sealed front chamber to a workpiece feed position of a push-disk slow cooling furnace hermetically connected with the sealed front chamber for slow cooling operation, or selectively pushes the carburized workpieces to the sealed front chamber or the workpiece feed position for crossed quenching operation or slow cooling operation;
quenching operation: the workpiece positioned in the sealed front chamber is driven by the workpiece quenching moving mechanism to descend into a quenching tank for quenching, and then is driven by the workpiece quenching moving mechanism to ascend to a discharge chamber hermetically isolated from the sealed front chamber for outputting the workpiece;
slow cooling operation: the workpiece on the workpiece feeding position is driven by the guide chain moving mechanism to leave the workpiece feeding position and move in a stepping mode towards the slow cooling discharge hole, meanwhile, the workpiece feeding position is pushed into the next workpiece to be slowly cooled, the protective gas feeding mechanism arranged close to the slow cooling discharge hole injects protective gas into the push disc type slow cooling furnace, the flowing direction of the protective gas is opposite to the moving direction of the workpiece, so that the protective gas dilutes carburizing atmosphere at the workpiece feeding position and discharges the carburizing atmosphere from the push disc type slow cooling furnace through the waste gas discharge mechanism arranged close to the slow cooling feed hole, and the workpiece is firstly kept warm by the heat preservation mechanism in the moving process, then is cooled by the cooling mechanism and then is pushed to the slow cooling discharge scavenging chamber by the slow cooling furnace discharge mechanism to output the workpiece.
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| CN116970784A (en) * | 2023-09-22 | 2023-10-31 | 江苏金色工业炉股份有限公司 | Pre-chamber slow-cooling type high-temperature tempering furnace |
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