CN208071763U - A kind of heat-treatment furnace that can realize rapid quenching - Google Patents
A kind of heat-treatment furnace that can realize rapid quenching Download PDFInfo
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- CN208071763U CN208071763U CN201820493455.5U CN201820493455U CN208071763U CN 208071763 U CN208071763 U CN 208071763U CN 201820493455 U CN201820493455 U CN 201820493455U CN 208071763 U CN208071763 U CN 208071763U
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Abstract
The utility model discloses a kind of heat-treatment furnaces that can realize rapid quenching, belong to the heat treatment equipment of rapid quenching, purpose is that solving existing metallic heat treating furnace will be vertically down in cooling chamber by water cooling lifting shaft by heating alloy, and import gas and alloy is cooled down, the problem of this limits heat-treatment quenching speed to a certain extent.Meanwhile the heat-treatment furnace of the utility model has uniform, controllable and accurate heat treatment temperature field, can realize the rapid quenching processing of sample, and whole process will not destroy vacuum in heat-treatment furnace.Further, structure-based improvement, the utility model can realize the multiple batches of quenching treatment of Multi-example.In addition, the utility model can also quickly and efficiently realize the purpose for heat treatment material rapid quenching using different hardening medias.The utility model is skillfully constructed, reasonable design, easy to operate, safe and reliable, for realizing the rapid quenching of material, has important application value.
Description
Technical field
The utility model is related to metal material Field of Heat-treatment, in particular for the heat treatment equipment of rapid quenching,
Specially a kind of heat-treatment furnace that can realize rapid quenching.The utility model is designed reasonably is skillfully constructed, and can effectively simplify
The structure of equipment, and realize the rapid quenching of use, the promotion for material property has important progress meaning.
Background technology
Heat treatment be metal material is heated to predetermined temperature in the solid state, and keep a period of time at such a temperature, then
A kind of cooling heat processing technique is carried out with certain speed.The purpose of heat treatment is to change the interior tissue knot of metal material
Structure, to improve its performance.By carrying out heat treatment process appropriate to material（I.e. to including the heat treatments such as temperature, cooling velocity
The control of condition）, various defects caused by the heat processing techniques such as casting, forging, weld can be eliminated in metal material, and crystal grain thinning disappears
Except segregation, internal stress is reduced, keeps the tissue of metal material and mechanical property more uniform.Wherein, cooling velocity significantly affects heat
The organization and performance of metal material after processing.For example, when steel is cooled down from austenitic state, because of cooling velocity difference, will turn respectively
Become the tissues such as pearlite, bainite and martensite.
Because most metals are needed during heat treatment in high vacuum or inert gas environment, to prevent block, this
Make subsequent quenching process, especially rapid quenching processes, realization become difficult.Currently, commonly quenching mode is main
It is quenched with air including vacuum chamber quenching.Wherein, vacuum chamber quenching apparatus generally has high vacuum heating and thermal insulation room and low vacuum
Quenching chamber is equipped with partition board valve in high vacuum heating and thermal insulation room, low vacuum quenching chamber.This kind of equipment can realize automation behaviour
Make, but equipment is difficult to realize rapid quenching at present.
Chinese invention patent CN102460052B discloses a kind of metallic heat treating furnace, and heating room passes through true with cooling chamber
Empty gate valve separation.The metallic heat treating furnace will be vertically down in cooling chamber by water cooling lifting shaft by heating alloy, and closed
After gate valve, gas is imported, alloy is cooled down, heat treatable alloy can be made to obtain larger cooling velocity.However, the device
In, lifting shaft stroke is larger, extends the alloy quenching time.In addition, structure-based limitation, which cannot achieve multiple conjunctions
Golden sample quenches in batches, and service efficiency is not high.In addition, the device can only use gas as unique hardening media, this is one
Determine to limit quenching velocity in degree, also limits the application range of the device to a certain extent.
And mode is quenched for air, although equipment is simple, temperature accuracy control is not high, and when quenching need to destroy vacuum,
So that the cool time extends, quenching velocity reduces.In addition, quenching mode using air, staff can be exposed to hot environment
In, or contact hot environment, there are larger security risks.
For this purpose, there is an urgent need to a kind of new devices, to solve the above problems.
Utility model content
The goal of the invention of the utility model is：It will be closed by heating by water cooling lifting shaft for existing metallic heat treating furnace
Gold is vertically down in cooling chamber, and is imported gas and cooled down to alloy, this limits heat-treatment quenching speed to a certain extent
The problem of spending provides a kind of heat-treatment furnace that can realize rapid quenching.The utility model can effectively solve the problem that existing metal fever
The problem that quenching velocity present in treatment furnace is limited, promotes quenching velocity, to realize rapid quenching.Meanwhile this practicality is new
The heat-treatment furnace of type has uniform, controllable and accurate heat treatment temperature field, can realize the rapid quenching processing of sample, and whole
A process will not destroy vacuum in heat-treatment furnace.Further, structure-based improvement, the utility model can realize that Multi-example is more
The quenching treatment of batch.In addition, the utility model can also be realized quickly and efficiently using different hardening medias for heat treatment
The purpose of material rapid quenching.The utility model is skillfully constructed, reasonable design, easy to operate, safe and reliable, for realizing material
The rapid quenching of material has important application value.
To achieve the goals above, the utility model adopts the following technical solution：
A kind of heat-treatment furnace that can realize rapid quenching, including heating furnace body, external furnace body, for being provided very for external furnace body
The vacuum unit of Altitude, tilt clapboard, heating unit, tilter, adapter cavity, the quenching chamber being arranged in heating furnace body, every
Disconnected switch unit, hardening media unit, the heating furnace body are arranged in outer furnace interior, and the vacuum unit is connected with external furnace body
And vacuum unit can will be evacuated to vacuum inside external furnace body；
The tilt clapboard is arranged in heating furnace body, and the angle between the tilt clapboard and horizontal plane is 5 ~ 85 °, institute
It states and forms hot processing chamber between tilt clapboard and heating furnace body, the heating unit is arranged in hot processing chamber and heating unit energy
Sample in hot processing chamber is heated, the tilter is arranged in hot processing chamber and tilter is rotated relative to hot processing chamber
When sample thereon can fall under the effect of gravity；
The hot processing chamber, adapter cavity, quenching chamber are vertically sequentially connected under upper and thermally treated chamber is handled
Sample can be entered in quenching chamber from adapter cavity through gravity, the cutoff switch unit, which is connected and is separated with adapter cavity, to be opened
The switch of adapter cavity can be realized by closing unit；
The cutoff switch unit includes upper gate valve, underthrust plate valve, and the upper gate valve, underthrust plate valve are vertically
It is successively set on adapter cavity from top to bottom；
The hardening media unit includes liquid flowing valve, inlet tube, at least one nozzle, the liquid flowing valve setting into
In liquid pipe, the nozzle is arranged in quenching chamber, and the inlet tube is connected with nozzle and hardening media can be successively through inlet tube, spray
Mouth enters in quenching chamber.
The heating furnace body is cuboid.
The section of the tilt clapboard vertically is in horn-like and greatly opening up.
The heating unit is arranged on the top of heating furnace body inner wall and/or side wall and heating unit can be to hot processing chamber
Interior sample is heated.
It further include the pedestal for providing support for external furnace body.
The nozzle is at least two, and the inlet tube is connected with nozzle respectively by annular liquid pipe.
Switch to quenching chamber can be realized by being provided with quenching fire door on the quenching chamber and quenching fire door.
Further include drain unit, the drain unit includes outlet tube, the liquid valve door that is arranged on outlet tube, it is described go out
Liquid pipe, which is connected with quenching chamber lower end and quenches indoor hardening media, to be exported through outlet tube.
Further include recovering tray, the recovering tray is arranged below outlet tube and the hardening media flowed out through outlet tube can enter
In recovering tray.
Further include setting quench indoor filter plate and the indoor hardening media of quenching can successively through filter plate, go out
Liquid pipe is output and then enter in recovering tray.
Further include the horizontal baffle being arranged in heating furnace body, the horizontal baffle be located at below tilt clapboard and it is horizontal every
Plate can separate space and the heat of hot processing chamber and quenching chamber.
The tilter be it is at least one, the tilter include vert plate body, the plate body that verts can be driven with respect to heating furnace
The driving device that body relatively rotates.
The tilter is at least two and tilter is uniformly arranged in hot processing chamber.
The furnace wall of the heating furnace body is followed successively by steel jacket layer, alumina fibre insulating layer, high-temperature oxydation from outside to inside
Aluminized coating.
For foregoing problems, the utility model provides a kind of heat-treatment furnace that can realize rapid quenching.In the structure, outside
Ordinary steel glue bladder type furnace body can be used in furnace body, and heating furnace body uses the multilayered structure square furnace with incubation and thermal insulation function.
Meanwhile the rodlike or plate heating element for Elema material can be used in heating unit.In addition, in the application, tilter can be with
For that can be rotated down 90 degree of smooth surface alumina plate, and bottom tilter places quenched metal sample at first, upwards in turn
Place follow-up sample to be quenched.In the utility model, cutoff switch unit includes upper gate valve, the lower plugboard for capableing of fast advance and retreat
Valve；Quenching chamber has independent sealed space, and is equipped with quenching fire door and filter plate, and filter plate can be with multiple filter hole
Alumina plate, filter hole can select different size and size according to actual heat treatment test button size；Recovering tray is used for back
Pass through hardening media derived from outlet tube after receiving rapid quenching.
Meanwhile tilt clapboard and horizontal baffle are provided in the utility model, tilt clapboard, which can ensure that, to be fallen on the partition board
Heat treatment sample slid again to underthrust plate valve, and the setting of horizontal baffle can be further spaced from heating furnace body and quenching chamber
Space and temperature.
In the utility model, upper gate valve is designed as keeping it turned on during heat treatment, and after sample is fallen
Energy quick-make, is quickly opened again after underthrust plate valve re-closes.In the utility model, underthrust plate valve is designed as must be upper
Gate valve could be opened quickly after being closed.Further, the hardening media unit of the utility model can be realized including water, oil, liquid
The hardening medias such as gas pass in and out quenching chamber.
Based on above-mentioned design scheme, the course of work of the device is as follows.Under the door opened state of external furnace body, by different materials
The test button of matter and batch is positioned on the tilter of horizontality；After closing the fire door of external furnace body, upper gate valve is being kept
It opens, in the state of the closing of underthrust plate valve and quenching fire door closing, furnace body is vacuumized, after the vacuum condition for reaching requirement,
Power supply is opened, and sample is heat-treated by heating unit.After heat treatment, according to actual requirement, filled by driving
Setting makes bottom or whole tilter vert downwards, after sample falls on underthrust plate valve upper end, upper gate valve quick-make, later under
Gate valve completes quickly to open and closing course, sample are fallen on the indoor filter plate of quenching, and opening liquid flowing valve makes quenching be situated between
Matter enters quenching chamber, and completes spray quenching process.After furnace body to be heated cooling, open liquid valve door hardening media made to pass through
Liquid pipe is exported to recovering tray, and test button continues to stay on filter plate, is opened quenching fire door, is taken out sample.
In the utility model, the design of the heating unit and two layers of partition board of upper end and both sides distribution can ensure heating furnace
Internal uniform, controllable and accurate heat treatment temperature field.The tilter design of vertical multi-layer is picked and placeed convenient for sample, it can be achieved that multiple
Sample simultaneously or successively quenching treatment.Upper and lower gate valve design can be effectively isolated the heating furnace body and quenching chamber of vacuum environment,
It does not destroy in entire hot processing chamber under the premise of vacuum state, realizes quenching process；Coordinated operation between gate valve and tilter,
It can guarantee that sample drops down onto quenching chamber within the time short as possible.The design of inlet tube, outlet tube can realize a variety of hardening medias
Transmission and export.In addition, the utility model is compact-sized, all components are installed in the same external furnace body, need not be outside
More devices are designed in furnace body lower end, and quenching process is easy to operate, safe, can realize rapid quenching after efficiently and effectively heat treatment,
And the danger in high temperature is exposed to without anyone.
Description of the drawings
Fig. 1 is the structural schematic diagram of device in embodiment 1.
Fig. 2 is the alumina filter plate schematic diagram with filter opening.
Fig. 3 is rectangular internally heated oven body protecting wall structure schematic diagram.
It is marked in figure：1, external furnace body, 2, heating furnace body, 3, vacuum unit, 4, pedestal, 5, tilter, 6, upper gate valve, 7,
Underthrust plate valve, 8, tilt clapboard, 9, horizontal baffle, 10, quenching chamber, 11, filter plate, 12, nozzle, 13, quenching fire door, 14, into
Liquid pipe, 15, liquid flowing valve, 16, liquid valve door, 17, outlet tube, 18, recovering tray, 19, heating unit, 20, adapter cavity, 30, steel
Jacket layer processed, 40, alumina fibre insulating layer, 50, high-temperature oxydation aluminized coating.
Specific implementation mode
Below in conjunction with the accompanying drawings, the utility model is described in detail.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Embodiment 1
As shown, the present embodiment can realize the heat-treatment furnace of rapid quenching include heating furnace body, pedestal, external furnace body,
Vacuum unit, tilt clapboard, horizontal baffle, heating unit, tilter, adapter cavity, quenching chamber, cutoff switch unit, quenching are situated between
Matter unit, drain unit, recovering tray.Wherein, external furnace body is set on the base, and is used to provide support for external furnace body.Vacuum list
Member is connected with external furnace body, is used to provide vacuum environment for external furnace body.When vacuum unit works, it can will be evacuated to inside external furnace body
Vacuum, to provide vacuum or inert gas environment for metal heat treatmet process.
Meanwhile heating furnace body setting, in outer furnace interior, quenching chamber is arranged in heating furnace body.Meanwhile it being set on quenching chamber
It is equipped with quenching fire door, quenching fire door can realize the switch to quenching chamber, and sample picks and places after being quenched with realization.The present embodiment
In, heating furnace body is cuboid.Tilt clapboard is inclined in heating furnace body, and heat is formed between tilt clapboard and heating furnace body
Processing chamber.Meanwhile horizontal baffle is arranged in heating furnace body and below tilt clapboard.In the present embodiment, horizontal baffle energy
Space and the heat for separating hot processing chamber and quenching chamber, to better ensure that the progress of quenching process.Tilter is arranged in heat
In processing chamber, heating unit is distributed on the top and side wall of heating furnace body inner wall.In the present embodiment, tilter includes the plate that verts
Body can drive the plate body that verts with respect to the driving device that heating furnace body relatively rotates, and tilter is configured according to the quantity of sample,
It can be uniformly arranged in hot processing chamber for multiple and tilter, such as two to 20.
Based on the structure, the section of tilt clapboard vertically is and big opening up in horn-like；Sample, which is placed in, to incline
On flap body, driving device drives plate body rotation of verting so that and the sample for the plate body sample that verts quickly is fallen under the effect of gravity, and
Horn-like tilt clapboard can make it fall into the adapter cavity of lower section to being oriented to sample.Meanwhile heating unit is distributed in
On the top and side wall of heating furnace body inner wall, to accurately be heated for the sample in hot processing chamber.
Meanwhile hot processing chamber, adapter cavity, quenching chamber are vertically sequentially connected under upper, cutoff switch unit with
Adapter cavity is connected.In the present embodiment, cutoff switch unit includes upper gate valve, underthrust plate valve, and upper gate valve, underthrust plate valve are along perpendicular
Histogram to being successively set on adapter cavity from top to bottom.In the device, the sample of thermally treated chamber processing under the effect of gravity, soon
Speed is entered from adapter cavity in quenching chamber, and the switch of adapter cavity can be realized by cutoff switch unit.
Structure-based improvement, without corresponding lifting shaft in the utility model so that sample enters after heat treatment
The time of quenching chamber is greatly shortened, and can realize the rapid quenching demand of sample.
Further, in the present embodiment, the furnace wall of heating furnace body is followed successively by steel jacket layer from outside to inside, alumina fibre is protected
Warm layer, high-temperature oxydation aluminized coating.Based on the structure, the furnace wall of heating furnace body has better heat insulation effect.
In the present embodiment, hardening media unit includes liquid flowing valve, inlet tube, several nozzles, and liquid flowing valve setting exists
On inlet tube, nozzle setting is distributed in quenching chamber, and inlet tube is connected by annular liquid pipe with nozzle.When the device works, into
Fluid valve is opened, and corresponding hardening media enters through inlet tube, annular liquid pipe, nozzle in quenching chamber successively, to realize to certainly
The quenching treatment for the sample that adapter cavity is fallen.
The liquid valve door that in the present embodiment, drain unit includes outlet tube, is arranged on outlet tube.Filter plate setting is being quenched
Below fiery chamber interior, outlet tube is connected with quenching chamber lower end, and quenching indoor hardening media can export through outlet tube.Meanwhile it returning
Closing quotation is arranged below outlet tube, and the hardening media through outlet tube outflow can enter in recovering tray.In the present embodiment, in quenching chamber
Hardening media successively through filter plate, outlet tube output after, into recovering tray.
It is that two different metal samples successively carry out rapid quenching in the present embodiment.
According to quenching sequencing, two pieces test button is positioned in heating furnace body on the tilter of horizontality,
In preferentially quench Sample A and be placed in lowest level, the rear sample B that quenches is placed in last layer.The fire door for closing external furnace body, gate valve in holding
It opens, underthrust plate valve is closed, and quenching fire door is closed；Then, furnace body is vacuumized by vacuum unit 3, reaches the vacuum of requirement
After degree, power supply is opened, and by heating unit heating, heat preservation, be heat-treated to sample.After, driving device dips down
Turn bottom tilter, after Sample A falls on underthrust plate valve upper end, upper gate valve quick-make；Then, underthrust plate valve is completed quick
Unlatching and closing course, above gate valve is quickly opened again later.Sample is fallen on the indoor filter plate of quenching, opens liquid feed valve
Door makes hardening media pass through inlet tube, annular liquid pipe and nozzle and enters quenching chamber, and completes the spray quenching process of Sample A.It waits for
Sample B complete heat treatment after, where tilter vert downwards, so that it is fallen on underthrust plate valve, later the stream of repeat sample A
Journey carries out rapid quenching.All sample quenchings terminate, and after furnace body cooling to be heated, open liquid valve door, hardening media is made to pass through
Outlet tube is exported into recovering tray, and Sample A and B continue to stay on filter plate；Quenching fire door is opened, all samples are taken out.
The utility model proposes heat-treatment furnace, avoid the use of elevating lever；And structure-based improvement, it can realize
For the rapid quenching of heat treatment sample；Meanwhile the utility model can realize uniformly accurate heat treatment temperature field, it can be achieved that
More samples, multiple batches of quenching treatment.The utility model can guarantee while not destroying in entire heat-treatment furnace under vacuum state
Sample is completed to quench within a very short time.The utility model is compact-sized, and component is installed in the same big furnace body, is not needed
In the more devices of external furnace body peripheral hardware meter, and it can realize and complete quenching using a variety of hardening medias.Whole process safety easy to operate,
It is effective and rapid, eliminate personnel's exposure or the danger of contact high temperature.
The foregoing is merely the preferred embodiment of the utility model, the scope of protection of the utility model is not limited in above-mentioned reality
Example is applied, the design and technical solution under all thinkings using the utility model belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, several changes under the premise of not departing from the utility model design principle
It should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of heat-treatment furnace that can realize rapid quenching, which is characterized in that including heating furnace body, external furnace body, for being outer
Furnace body provides the vacuum unit of vacuum environment, tilt clapboard, heating unit, tilter, adapter cavity, is arranged in heating furnace body
Quenching chamber, cutoff switch unit, hardening media unit, heating furnace body setting in outer furnace interior, the vacuum unit with
External furnace body is connected and vacuum unit can will be evacuated to vacuum inside external furnace body；
The tilt clapboard is arranged in heating furnace body, and the angle between the tilt clapboard and horizontal plane is 5 ~ 85 °, described to incline
Hot processing chamber is formed between inclined clapboard and heating furnace body, the heating unit is arranged in hot processing chamber and heating unit can be to warm
Sample in processing chamber is heated, tilter setting in hot processing chamber and when tilter is rotated relative to hot processing chamber its
On sample can fall under the effect of gravity；
The sample that the hot processing chamber, adapter cavity, quenching chamber are vertically sequentially connected under upper and thermally treated chamber is handled
Product can be entered from adapter cavity in quenching chamber through gravity, and the cutoff switch unit is connected with adapter cavity and cutoff switch list
Member can realize the switch of adapter cavity；
The cutoff switch unit includes upper gate valve, underthrust plate valve, and the upper gate valve, underthrust plate valve are vertically from upper
It is successively set on adapter cavity under；
The hardening media unit includes liquid flowing valve, inlet tube, at least one nozzle, and the liquid flowing valve is arranged in inlet tube
On, the nozzle is arranged in quenching chamber, the inlet tube be connected with nozzle and hardening media can successively through inlet tube, nozzle into
Enter in quenching chamber.
2. heat-treatment furnace according to claim 1, which is characterized in that the section of the tilt clapboard vertically is in loudspeaker
Shape and greatly opening up.
3. heat-treatment furnace according to claim 1, which is characterized in that the heating unit is arranged in heating furnace body inner wall
On top and/or side wall and heating unit can heat the sample in hot processing chamber.
4. heat-treatment furnace according to claim 1, which is characterized in that be provided with quenching fire door and quenching on the quenching chamber
Fire door can realize the switch to quenching chamber.
5. heat-treatment furnace according to claim 1, which is characterized in that further include drain unit, the drain unit includes
Outlet tube, the liquid valve door being arranged on outlet tube, the outlet tube are connected with quenching chamber lower end and quench indoor quenching and be situated between
Mass-energy is exported through outlet tube.
6. heat-treatment furnace according to claim 5, which is characterized in that further include recovering tray, the recovering tray setting is going out
Below liquid pipe and the hardening media through outlet tube outflow can enter in recovering tray.
7. heat-treatment furnace according to claim 6, which is characterized in that further include that setting is quenching indoor filter plate and quenching
The indoor hardening media of fire can be output and then enter through filter plate, outlet tube in recovering tray successively.
8. heat-treatment furnace according to claim 1, which is characterized in that further include be arranged in heating furnace body it is horizontal every
Plate, the horizontal baffle is located at below tilt clapboard and horizontal baffle can separate space and the heat of hot processing chamber and quenching chamber.
9. according to claim 1 ~ 8 any one of them heat-treatment furnace, which is characterized in that the tilter is at least one, institute
State tilter include vert plate body, the plate body that verts can be driven with respect to the driving device that heating furnace body relatively rotates.
10. heat-treatment furnace according to claim 9, which is characterized in that the furnace wall of the heating furnace body is from outside to inside successively
For steel jacket layer, alumina fibre insulating layer, high-temperature oxydation aluminized coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820493455.5U CN208071763U (en) | 2018-04-09 | 2018-04-09 | A kind of heat-treatment furnace that can realize rapid quenching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820493455.5U CN208071763U (en) | 2018-04-09 | 2018-04-09 | A kind of heat-treatment furnace that can realize rapid quenching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208071763U true CN208071763U (en) | 2018-11-09 |
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ID=64040062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820493455.5U Active CN208071763U (en) | 2018-04-09 | 2018-04-09 | A kind of heat-treatment furnace that can realize rapid quenching |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004904A (en) * | 2019-12-20 | 2020-04-14 | 薄士霞 | Anti-oxidation box-type furnace capable of being heated uniformly |
| CN111793783A (en) * | 2020-06-23 | 2020-10-20 | 苏州东子云工业技术科技有限公司 | External heating vertical vacuum carburizing quenching furnace |
-
2018
- 2018-04-09 CN CN201820493455.5U patent/CN208071763U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004904A (en) * | 2019-12-20 | 2020-04-14 | 薄士霞 | Anti-oxidation box-type furnace capable of being heated uniformly |
| CN111793783A (en) * | 2020-06-23 | 2020-10-20 | 苏州东子云工业技术科技有限公司 | External heating vertical vacuum carburizing quenching furnace |
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