CN101134991A - Linear type heat treatment furnace - Google Patents
Linear type heat treatment furnace Download PDFInfo
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- CN101134991A CN101134991A CNA2007100593219A CN200710059321A CN101134991A CN 101134991 A CN101134991 A CN 101134991A CN A2007100593219 A CNA2007100593219 A CN A2007100593219A CN 200710059321 A CN200710059321 A CN 200710059321A CN 101134991 A CN101134991 A CN 101134991A
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Abstract
The linear heat treatment furnace includes one workpiece preheating chamber, one workpiece carbonizing heat treatment chamber, and one workpiece quenching chamber. It has rollers and circulating fans inside the sealed chambers, electric heaters inside the heat treatment chamber and the quenching chamber, gas burner inside the preheating chamber, motors, chains and rollers separately inside the chambers, and two crossed photoelectric sensors. It can regulate the workpiece moving speeds in different chambers and control the atmospheres, circulating time, etc in different chambers, so as to obtain high quality product with homogeneous carbonization and homogeneous micro structure and to increase the service life of the rollers.
Description
Technical field
The invention belongs to the used for metal thermal treatment stove, particularly relate to and a kind ofly constituting by preheating chamber, thermal chamber, quenching chamber, each chamber is equipped with independently motor and forwards rotates under motor, chain drive or workpiece arrives when specifying station at each station, and the certain hour of whenever being separated by rotates one group of roller and two cross light electric transducers of 180 ° forward or backward.The speed of carrying out of workpiece is controlled according to thermal treatment process, can control atmosphere gas and cycling time, the temperature etc. of each chamber respectively, prevents the atmosphere fluctuation, makes workpiece metal organize metallographic even, to obtain the more linear type heat treatment furnace of quality products.
Background technology
The discovery of metal has considerable influence power to the development of human civilization, and human use's metal has been made a variety of instruments.Human development simultaneously also utilizes the technology of metal, wherein the most important thing is to utilize the character of metal to do heat treatment process.
Heat treating method is in order to obtain the needed performance of user in the heat treated workpiece of needs, and the tissue that makes metal after heating becomes the recrystallize state, make above-mentioned tissue and use form satisfactory sclerosis, quenching or annealed process this moment after metal inside is infiltrated the tissue that multiple composition obtains needing.
In heat treatment process in order to obtain the fine product, the coolant temperature that other compositions such as carbon containing gas are penetrated into the martensitic transformation (diffusionless transformation) that occurs in the work-piece cools process after the thermal chamber of metal structure inside and thermal treatment finish and chilling is adjusted into little high austempering phase transformation (diffusion phase transformation) etc. of required time before phase transformation finishes.And in heat treatment of workpieces technology, use the isothermal annealing technology, this is the suitable processibility in order to ensure steel.Originally workpiece slowly cooling in stove is improved to the technology of keeping this temperature certain hour after the certain temperature (beginning between the nasal portion of TTT curve from the A1 transformation temperature) that is quenched to.
Using this isothermal phase change technology is the method for cooling that is quenched to certain temperature than continuity, can obtain uniform quality and just often use.Particularly austempering except the steady quality of product, obtains the particular tissues bainite that is difficult to obtain in addition in cooling off continuously.This bainite is trickle pearlitic a kind of, and the transformation as martensitic transformation can not take place, so be out of shape for a short time, can obtain simultaneously and be only second to martensitic high rigidity, so purposes also increased.This bainite is to distinguish bainite of obtaining on top after phase transformation more than 350 ℃ and the bainite of obtaining in the bottom.The hardness of top bainite is low, therefore but have good elasticity, (as clip, spring washer,, clasp etc.) uses in the accessory of elasticity of demand, the bottom bainite is not only to have kept elasticity but also hardness is also very high, therefore use the power that often is hit and the weather resistance product in.
In all thermal treatment process workpiece being heated to certain temperature is in order to form a kind of means of perfect recrystallized structure, and the process of keeping this state is very important.
High temperature because of heat treatment furnace inside, being installed in the inner roller of transferring workpiece of heat treatment furnace is the high heat resistance material, mustn't be out of shape under high heat resistance and the high temperature, workpiece being advanced by thermal treatment process or keep aspect roller such as this position in stove is very important accessory.The roller of preheating chamber, thermal chamber, quenching chamber inside that constitutes heat treatment furnace in other words is with single motor rotating method simultaneously, but this method and thermal treatment process are irrelevant, utilize certain speed to advance and by all technologies, irrelevant with the size of workpiece, rotating speed is identical, atmosphere gas to furnace interior changes and can't adapt to, and also just becomes the reason that produces the bad product of quality.
Fig. 1 is the linear type heat treatment furnace structural representation of prior art.As shown in the figure, the linear type heat treatment furnace of prior art is made of preheating chamber 10, thermal chamber 20, quenching chamber 30.Preheating chamber is to cut apart door by entrance door 11 and first 12 to form seal cavity, and a motor 100 is housed in the preheating chamber, and driven by motor chain 16 and roller 14 turn round, and makes in addition that internal temperature is even, the uniform air-circulating fan 15 of atmosphere gas.
Thermal chamber is cut apart door 12 and second by first and is cut apart door and 32 forms seal cavity, and thermal chamber is provided with a motor 100, driven by motor chain 26 and all rollers 24 turn round.Same air-circulating fan 25 in addition.
Quenching chamber cuts apart door 32 by second and outlet portal 31 forms seal cavity, drives chain 36 and roller 34 runnings by a motor 100.Be provided with air-circulating fan 35.
Therefore develop into as described in Figure 1 preheating chamber, thermal chamber, quenching chamber, each chamber is equipped with single motor respectively.But in order to satisfy indivedual conditions of each chamber, standby time and the time instability of advancing mobile, distortion such as sinking because of high temperature reason generation roller, irrelevant with the bracket size that workpiece is housed, often be to be forward travel state at the whole roller of regular hour startup simultaneously, therefore produce a lot of problems, only control heat treated workpiece and rest on heat treatment furnace inside, the handover speed of workpiece in the uncontrollable stove, and the lost hours during because of the circulation change is elongated, and can not obtain the quality of expection, so will produce the bad product of quality in the workpiece.
The linear type heat treatment furnace of prior art, workpiece need clean earlier and remove greasy dirt and enter preheating chamber again, have increased matting and cleaning equipment like this, the cost height.
Summary of the invention
The present invention provides a kind of gas burner that is provided with for solving the technical problem that exists in the known technology in preheating chamber; Preheating chamber, thermal chamber, each chamber of quenching chamber are equipped with independently motor and forwards rotate under motor, chain drive or workpiece arrives when specifying station at each station in addition, and the certain hour of whenever being separated by rotates 180 ° the one group of roller and the photo-sensor of two intersections forward or backward.Can control the gait of march of workpiece according to thermal treatment process; Can control simultaneously atmosphere gas and cycling time, the temperature etc. of each chamber respectively; Prevent that atmosphere fluctuation and carburizing are even, metallographic is quality products more uniformly.And the minimizing matting, the linear type heat treatment furnace that has prolonged roller work-ing life.
The present invention for the technical scheme that solves the technical problem that exists in the known technology and take is: linear type heat treatment furnace of the present invention comprises: the thermal chamber of handling for the preheating chamber of workpiece preheating, for workpiece carbonization, be the quenching chamber of workpiece quench hardening processing; Preheating chamber is cut apart a formation seal cavity with entrance door and first; Roller, air-circulating fan are installed in the preheating chamber; Thermal chamber is cut apart door and second with first and is cut apart a formation seal cavity, and thermal chamber is equipped with roller, air-circulating fan, electric heater; Quenching chamber cuts apart door with second and outlet portal forms seal cavity, and quenching chamber is equipped with roller, air-circulating fan, electric heater; Gas burner also is installed in its preheating chamber; Preheating chamber, thermal chamber, each chamber of quenching chamber are equipped with independently motor and forwards rotate under motor, chain drive or workpiece arrives when specifying station at each station in addition, and the certain hour of whenever being separated by rotates 180 ° the one group of roller and the photo-sensor of two intersections forward or backward.
Advantage and positively effect that the present invention has are:
Linear type heat treatment furnace of the present invention is the linear type heat treatment furnace that is made of each sealing area of preheating chamber, thermal chamber and quenching chamber.Each chamber is equipped with independently motor and forwards rotates under motor, chain drive or workpiece arrives when specifying station at each station, and the certain hour of whenever being separated by rotates 180 ° the one group of roller and the photo-sensor of two intersections forward or backward.Can control the gait of march of adjusting workpiece according to thermal treatment process like this; Waiting time in the time of can shortening the circulation change, opposite with original push-down, the sky carriage of can avoiding packing into.And can control atmosphere gas and cycling time, the temperature etc. of each chamber respectively.Prevent the atmosphere fluctuation, make carburizing even, the metallographic of metal structure is even, can not only obtain better quality products, and is new, a practical invention.
Distortion such as sinking do not take place in roller in the pyritous heat treatment furnace simultaneously, have prolonged the work-ing life of roller.
In addition, be provided with gas burner in the preheating chamber, workpiece needn't clean before entering preheating chamber, and by gas burner the greasy dirt on the workpiece has been burnt, and has saved matting and cleaning equipment.Reduced cost.
Description of drawings
Fig. 1 is the linear type heat treatment furnace structural representation of prior art;
Fig. 2 is a linear type heat treatment furnace structural representation of the present invention;
Fig. 3 is motor, chain, the roller transmission system synoptic diagram of a station of the present invention;
Fig. 4 be among Fig. 3 A to view;
Fig. 5 implements thermal treatment unit structural representation of the present invention;
Fig. 6 is a linear type heat treatment furnace workflow diagram of the present invention;
Fig. 7 is a linear type heat treatment furnace electrical component of the present invention installation position synoptic diagram;
Fig. 8 is a linear type heat treatment furnace pilot circuit block diagram of the present invention;
Fig. 9 is the programmable logic controller functional block diagram.
The nomenclature of major parts in the accompanying drawing:
10: preheating chamber. 11: entrance door
Cut apart door 13 in 12: the 1: gas burner
20: thermal chamber 25: air-circulating fan
30: quenching chamber. 31: outlet portal.
Cut apart door 23,33 in 32: the 2: well heater
14,24,34: roller 15,35: air-circulating fan
16,26,36: chain 37: stirrer
38: cylinder 39: photo-sensor
40: quenching mortise 41: driven sprocket
42: drive sprocket 43: clutch coupling
50: workpiece 60: the workpiece charging apparatus
70: workpiece caterpillar 100: motor
TB: operation box TB ': controlling box
SV: magnetic valve PH: photo-sensor
NSW: contact switch LS: limit switch
M: motor
Embodiment
It is following that the present invention will be described in detail with reference to drawings and Examples.
Parts same as the prior art have used identical symbol in the accompanying drawing.
Linear type heat treatment furnace of the present invention such as Fig. 2 are to shown in Figure 5, and Fig. 2 is a linear type heat treatment furnace structural representation of the present invention.As shown in Figure 2, the present invention is by preheating chamber 10, thermal chamber 20, the linear type heat treatment furnace that quenching chamber 30 constitutes.At first explanation a bit: each station of each chamber is to represent with the square box that long and short dash line surrounds in Fig. 2, Fig. 5.
Preheating chamber 10 the 1st is cut apart door 12 and is formed a sealed space by what the loading port of the workpiece 50 of packing into and outside entrance door 11 that cuts off and thermal chamber 20 separated.Inside is provided with gas burner 13 heating internal temperatures, and removes the greasy dirt on the workpiece.Transfer workpiece 50 and finish, and finish warm at this by roller 14.Preheating chamber has a station, several rollers of a station are one group, and one group of roller of this station is equipped with independently motor 100, and this group roller forwards rotates under driving at motor 100, chain 16, after workpiece arrived this station, this group roller certain hour of being separated by rotated 180 ° forward or backward.This station is equipped with the photo-sensor 39 of two intersections.Workpiece enters the appointment station, and photo-sensor sends signal, and this group roller stops forwards to rotate, and workpiece rests on this station, and the roller certain hour that begins to be separated by rotates 180 ° forward or backward, shifts out after workpiece temperature reaches 890 ℃-910 ℃.
The mixture combustion that the Sweet natural gas that has air that air compressor machine sends here and pipeline in the gas burner forms.
Be equipped with in the preheating chamber upper inside and make in the stove temperature and the uniform air-circulating fan 15 of atmosphere gas and in order to discharge the relief outlet of furnace atmosphere gas.
For the quenching chamber 30 of the character phase transformation that makes the heat treated part 50 in the above-mentioned thermal chamber 20 is to be distributed in the 2nd of thermal chamber 20 to cut apart between door 32 and the outlet portal 31, constitute independently seal cavity.In order to keep condition of high temperature design and installation has been arranged in this quenching chamber 30 electric heater 33 and transfer the roller 34 of workpiece 50.Several rollers of a station are one group, and one group of roller of each station is equipped with separately independently motor 100, and every group of roller forwards rotates under driving at motor, chain 36; Or workpiece is when arrive specifying station, and every group of roller certain hour of being separated by rotates 180 ° forward or backward.Each station is equipped with the photo-sensor 39 of two intersections.And install for uniform hardening chamber 30 internal temperatures and the uniform air-circulating fan 35 of atmosphere gas in the quenching chamber upper inside, the retained austenite amount is minimized, it is darker that carburized depth becomes.
Fig. 3 is motor, chain, the roller transmission system synoptic diagram of a station of the present invention; Fig. 4 be among Fig. 3 A to view.As shown in Figure 3, the individual motor 100 of each station is connecting clutch coupling 43 and drive sprocket 42, and drive sprocket 42 is rotated by each driven sprocket 41 that chain 16 drives on 14 of one group of rollers.
Fig. 4 be A to view, be to be the synoptic diagram of a station of one group among the figure with four rollers, other sprocket wheels can also be installed as tightening pulley or guide deflection sheave between drive sprocket and driven sprocket.By Fig. 2, Fig. 3, Fig. 4 as can be known, every group of roller all is equipped with separately independently motor 100, driven by motor drive sprocket, chain, driven sprocket and one group of roller turn, and one group of roller forwards rotates sometimes, and workpiece advances; Sometimes stop operating, workpiece is arrived specify station.
The material of linear type heat treatment furnace middle roller of the present invention requires: work in 24 hours in 930 ℃ of high temperature, distortion such as sinking do not take place for roller, the present invention is equipped with independently motor with one group of roller of each station, roller is except forwards rotating, and for working face (heating surface) conversion in turn that makes roller, whenever the certain hour of being separated by rotates 180 ° forward or backward, be below roller one side up forwards to, be separated by behind the certain hour, above one side down forwards to, the working face of roller is heated by turns like this, makes roller that distortion such as sinking not take place, and has prolonged the work-ing life of roller.
Fig. 5 implements thermal treatment unit structural representation of the present invention.As shown in Figure 5, the original workpiece charging apparatus 60 consistent with entrance door 11 is installed in preheating chamber of the present invention 10 fronts, need put into preheating chamber 10 inside by heat treated workpiece 50, and quenching chamber 30 rears are quenching tanks 40 of chilling workpiece, used cylinder 38 when there are quenching tank 40 cooling medium vortex blender 37 and workpiece 50 dippings in inside, the rear is equipped with the caterpillar 70 of workpiece, and the workpiece 50 that thermal treatment is finished is drawn out to the outside.
Fig. 6 is a linear type heat treatment furnace workflow diagram of the present invention.As shown in Figure 6, the workflow that is designed to Equipment for Heating Processing as above underdraws as follows, utilize the present invention that workpiece 50 is heat-treated, the entrance door 11 of at first opening preheating chamber 10 will need heat treated workpiece 50 to utilize workpiece charging apparatus 60 to be transplanted on preheating chamber 10 inside, close entrance door.At this moment one group of roller 14 of station is the individual motor 100 of basis oneself in the preheating chamber 10, forwards rotates under driving at motor, chain 16.When workpiece 50 is transplanted on the interior location of preheating chamber 10, start the air-circulating fan 15 uniform diffusion temperature inside that upside is installed simultaneously.The photo-sensor of two intersections is also worked simultaneously in the preheating chamber.
Preheating chamber is heated by gas burner.The mixture combustion that the Sweet natural gas that has air that air compressor machine sends here and pipeline in the gas burner forms.
Roller turn is delivered to the appointment station with workpiece, and this group roller certain hour of being separated by rotates 180 ° forward or backward and shifts out after workpiece temperature reaches 890 ℃-910 ℃.
Mode is heated to the workpiece 50 of certain temperature from preheating chamber 10 according to this, with the roller 24 of each self-starting workpiece 50 is transplanted on thermal chamber 20 according to individual motor separately when the 1st cuts apart door 12 and open.Close the 1st and cut apart door.Thermal chamber is heated by electric heater, makes workpiece temperature reach 910 ℃-930 ℃.Enter into the workpiece 50 of thermal chamber 20 carburizings, thermal treatment process according to workpiece, individual motor separately 100 according to each station of thermal chamber 20, rotate with starting roller 24 by working direction separately, workpiece is delivered to the appointment station, every group of roller certain hour of being separated by rotates 180 ° forward or backward, and 910 ℃-930 ℃ of temperature are till the carburizing of workpiece 50 is finished.
The workpiece 50 that above-mentioned thermal treatment finishes is cut apart door 32 when opening when the 2nd, according to each individual motor 100, every group of roller forwards rotates, and workpiece is transplanted on quenching chamber 30 one by one in order, cut apart door 32 with the 2nd subsequently and close, make cementation process reach more stable effect.The workpiece 50 that enters into quenching chamber 30 according to aforesaid method forms new tissue in quenching chamber 30 inner sustain transformation temperatures, and quenching chamber is heated by electric heater, makes workpiece temperature at 830 ℃-860 ℃.
This moment, the roller 34 of quenching chamber 30 inside was according to each independently motor 100 rotation forwards under motor, chain 36 drive; Or every group of roller specifying the station certain hour of being separated by to rotate 180 ° forward or backward.Up to workpiece temperature is 830 ℃-860 ℃, reaches the residence time.Therefore workpiece 50 rests on quenching chamber 30 effectively, forms stable tissue.
After above-mentioned state workpiece 50 new tissues were finished the cooling operation, after quenching chamber 30 stayed for a while, outlet portal 31 was opened, and roller 34 startups simultaneously are transplanted on quenching tank 40 with workpiece 50, close outlet portal.With oil or salt flushing or dipping and chilling in quenching tank 40.The mode of 40 li dippings of quenching tank this moment is to start cylinder 38, the next workpiece 50 of quenching chamber 30 handovers is impregnated into quenching tank 40 inner backs takes out.The stirrer 37 that meanwhile starts quenching tank 40 evenly cools off medium, and the cooling medium are with uniform temperature cooling workpiece 50.
After being pulled out to the outside with the workpiece 50 usefulness workpiece caterpillars 70 of chilling, quenching tank 40 promptly finished heat treatment operation.
More than each indoorly all is equipped with the temperature that temperature sensor (not shown) is measured each chamber.
Below linear type heat treatment furnace circuit part of the present invention is described.
Fig. 7 is a linear type heat treatment furnace electrical component of the present invention installation position synoptic diagram; Fig. 8 is a linear type heat treatment furnace pilot circuit block diagram; Fig. 9 is the programmable logic controller functional block diagram.
As Fig. 7, Fig. 8, shown in Figure 9, circuit part of the present invention comprises: the power supply box that is connected in city's electrical network; Be connected with power supply box, inside is provided with the controlling box TB ' of PLC programmable logic controller; Be installed on the operation box TB that the heat treatment furnace outside is connected with controlling box; Be installed on the heat treatment furnace outside, the terminal box that programmable logic controller is connected with linear type heat treatment furnace; One end is connected with controlling box, the heating container that the other end is connected with temperature sensor in the heat treatment furnace; The linear type heat treatment furnace that is connected with terminal box, heating container, operation box.
Its controlling box PLC programmable logic controller is made of GOT touch input, the display screen of CPU central authorities microprocessing unit, storage part, input part, efferent and front panel setting.Program and photoelectricity, temperature sensor feedback signal by the input part input and be stored in the storage part, make linear type heat treatment furnace by programming and photoelectricity, the running of temperature sensor feedback signal.Its operation box is provided with various push button switches, adjusts knob and Dial of instrument formation, operation box can be converted to manual operation when needing.Its linear type heat treatment furnace furnace wall is provided with heating tube, transfer roller motor M that bottom outside is provided with to be connected with controlling box is provided with fan and the fan electromotor that is connected with controlling box with contact switch NSW, furnace roof portion, each switch door is provided with the magnetic valve SV that is connected by limit switch LS with controlling box, operation box, each parts setting of above-mentioned linear type heat treatment furnace as shown in Figure 7, each parts of linear type heat treatment furnace are all by programming or operation box manual operation running, action, its running, course of action such as flow process shown in Figure 6 and above corresponding character narrate part.
Claims (1)
1. linear type heat treatment furnace comprises: the thermal chamber of handling for the preheating chamber (10) of workpiece preheating, for workpiece carbonization (20), be the quenching chamber (30) of workpiece quench hardening processing; Preheating chamber is cut apart door (12) with entrance door (11) and first and is formed seal cavity; Roller (14), air-circulating fan (15) are installed in the preheating chamber; Thermal chamber is cut apart door (12) and second with first and is cut apart door (32) formation seal cavity, and thermal chamber is equipped with roller (24), air-circulating fan (25), electric heater (23); Quenching chamber cuts apart door (32) with second and outlet portal (31) forms seal cavity, and quenching chamber is equipped with roller (34), air-circulating fan (35), electric heater (33); It is characterized in that also being equipped with in the preheating chamber gas burner (13); Preheating chamber, thermal chamber, each chamber of quenching chamber are equipped with independently motor (100) and drive in motor, chain (16), (26), (36) at each station and forwards rotate down or workpiece when arriving the appointment station in addition, and the certain hour of whenever being separated by rotates 180 ° the one group of roller and the photo-sensor (39) of two intersections forward or backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100593219A CN100513594C (en) | 2007-08-27 | 2007-08-27 | Linear type heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100593219A CN100513594C (en) | 2007-08-27 | 2007-08-27 | Linear type heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101134991A true CN101134991A (en) | 2008-03-05 |
| CN100513594C CN100513594C (en) | 2009-07-15 |
Family
ID=39159315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100593219A Active CN100513594C (en) | 2007-08-27 | 2007-08-27 | Linear type heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100513594C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787291A (en) * | 2011-05-16 | 2012-11-21 | 钱佼佼 | Preheating zone improvement structure of heat treatment carburization furnace |
| CN117144108A (en) * | 2023-10-30 | 2023-12-01 | 山西铱倍力科技有限公司 | Heat treatment furnace for titanium anode production |
-
2007
- 2007-08-27 CN CNB2007100593219A patent/CN100513594C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787291A (en) * | 2011-05-16 | 2012-11-21 | 钱佼佼 | Preheating zone improvement structure of heat treatment carburization furnace |
| CN117144108A (en) * | 2023-10-30 | 2023-12-01 | 山西铱倍力科技有限公司 | Heat treatment furnace for titanium anode production |
| CN117144108B (en) * | 2023-10-30 | 2024-01-23 | 山西铱倍力科技有限公司 | Heat treatment furnace for titanium anode production |
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| Publication number | Publication date |
|---|---|
| CN100513594C (en) | 2009-07-15 |
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Owner name: DONGWOO DONGAM (TIANJIN) HEAT TREATMENT SYSTEMS CO Free format text: FORMER NAME: DONGAM (TIANJIN) METAL CO., LTD. |
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Address after: 300409 No. 12, Xin Wen Industrial Park, Beichen science and Technology Park, Tianjin Patentee after: Dongyu Dongan (Tianjin) Heat Treatment System Co.,Ltd. Address before: 300190 No. 12, Xin Wen Industrial Park, Beichen science and Technology Park, Tianjin Patentee before: Dong'an (Tianjin) Metal Co.,Ltd. |
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Effective date of registration: 20161017 Address after: 214174 Jiangsu Province, Wuxi city Huishan District Chang Hui Lu 6-8, No. 6-9 Patentee after: Dong an East (Wuxi) heat treatment Co.,Ltd. Address before: 300409 No. 12, Xin Wen Industrial Park, Beichen science and Technology Park, Tianjin Patentee before: Dongyu Dongan (Tianjin) Heat Treatment System Co.,Ltd. |
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Address after: 214000 no.6-8, 6-9, Changhui Road, Huishan District, Wuxi City, Jiangsu Province Patentee after: Dongyu Dong'an (Wuxi) Technology Co.,Ltd. Address before: 214174 no.6-8, 6-9, Changhui Road, Huishan District, Wuxi City, Jiangsu Province Patentee before: Dong an East (Wuxi) heat treatment Co.,Ltd. |