CN102589293B - Control device for cover of electric induction furnace - Google Patents
Control device for cover of electric induction furnace Download PDFInfo
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- CN102589293B CN102589293B CN 201210054020 CN201210054020A CN102589293B CN 102589293 B CN102589293 B CN 102589293B CN 201210054020 CN201210054020 CN 201210054020 CN 201210054020 A CN201210054020 A CN 201210054020A CN 102589293 B CN102589293 B CN 102589293B
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Abstract
The invention relates to a control device for a cover of an electric induction furnace. A framework with a vertical shaft in the middle is arranged on one side of a furnace body, a sleeve is installed outside the vertical shaft through a bearing in sleeve mode, a connection rod is installed at the upper end of the sleeve through a connecting rod I and a pin shaft I, a lifting cylinder is installed between the sleeve and the connection rod, and the connection rod is further connected with a big furnace cover. Two limiting contact blocks of a limiting switch X2 are further installed between a lifting cylinder tube body and the connection rod, a rotary cylinder is further installed on the framework, a piston rod of the rotary cylinder is connected with the sleeve through a pin shaft III and a connecting rod V, and two limiting contact blocks of a limiting switch X1 are further installed between the rotary cylinder tube body and the sleeve. A high-pressure air pump is respectively communicated with the lifting cylinder and a front air chamber and a rear air chamber of the rotary cylinder through a solenoid directional valve DTI and a solenoid directional valve DTII, and a 220-volt alternate current power source is respectively electrically connected a first return circuit, a second return circuit, a third return circuit, a fourth return circuit, a fifth return circuit and a sixth return circuit through an L connection point and an N connection point. The control device for the cover of the electric induction furnace can open and close the furnace cover safely and conveniently, can greatly reduce loss of heat energy and greatly reduces casting cost.
Description
Technical field
The present invention relates to a kind of control device, particularly a kind of control device of electric induction furnace bell of foundary industry fusing molten iron.
Background technology
The heating furnace of foundary industry fusing molten iron is categorized as furnace cupola and electric furnace two big classes with thermal source, and electric furnace is most widely used general with medium-frequency induction furnace again.Homemade electric induction furnace also is furnished with bell, but because of relatively heavier, mobile inconvenient, a lot of electric furnaces have bell and do not use.The bell of import electric induction furnace moves (contain and promote and spinning movement) with uncapping and closing lid of a cover hydraulic jack control bell.Electric induction furnace is except the reinforced time, and temperature can reach more than the 1600oC in the stove in fusing molten iron process, is dispersed into the space as not covering its heat of bell from the fire door that opens wide, and heat energy loss is very big.
An importance of the development plan of country's " 12 " casting industry is exactly green casting, energy-saving and emission-reduction, and the expert who has proposes " will open pot cover scarcely cooks ".Because have 75% from fire door, to lose in the heat loss of electric induction furnace, so on homemade electric induction furnace, it is very important that the control method of transformation bell can conveniently be used bell.
Summary of the invention
The control device that the purpose of this invention is to provide a kind of electric induction furnace bell.This control device can open bell fool proof, easily and cut out bell.Can greatly reduce heat energy loss, greatly save the casting cost.
Technical scheme of the present invention is: a kind of control device of electric induction furnace bell.Side installation frame at body of heater.In frame mid portion vertical shaft is housed.Sleeve of the outside suit of vertical shaft.Between vertical shaft and the sleeve bearing is installed, sleeve can rotate around vertical shaft by bearing.Be welded with the connecting rod I in the sleeve upper end, connecting rod I top flexibly connects by bearing pin I and connecting rod.Connecting rod one end is the inclination brace, fixedlys connected with big bell in inclination brace end.The connecting rod other end is tranverse connecting rod.
Fixedly connected with sleeve in the lower end of lift cylinder, lift cylinder can rotate with the rotation of sleeve.The lift cylinder piston rod top of lift cylinder flexibly connects by bearing pin II and connecting rod II.Fixedly connected with the tranverse connecting rod end in connecting rod II upper end.Be connected with the connecting rod III on the lift cylinder cylindrical shell, there is the spacing contact block I of limit switch X2 connecting rod III end, and the tranverse connecting rod end is connected with the connecting rod IV, and there is the spacing contact block II of limit switch X2 connecting rod IV end.In the middle of spacing contact block I and the spacing contact block II gap is arranged, spacing contact block I and spacing contact block II are touched mutually and are made limit switch X2 conducting when the lift cylinder piston rod is all withdrawn.Spacing contact block I and spacing contact block II are electrically connected by the coil of lead with L contact and contactor IV respectively.Rotary cylinder also is housed on the framework.
The rotary cylinder piston rod end of rotary cylinder flexibly connects by bearing pin III and connecting rod V, and the connecting rod V other end is connected by the outer ring of glue chain I and sleeve.Be connected with the connecting rod VI on the rotary cylinder cylindrical shell, there is the spacing contact block III of limit switch X1 connecting rod VI end, and sleeve is connected with the connecting rod VII by glue chain II, and there is the spacing contact block IV of limit switch X1 connecting rod VII end.In the middle of spacing contact block III and the spacing contact block IV gap is arranged, spacing contact block III and spacing contact block IV are touched mutually and are made limit switch X1 conducting when the rotary cylinder piston rod is all withdrawn.Spacing contact block III and spacing contact block IV are electrically connected by the coil of lead with L contact and contactor III respectively.
As shown in Figure 3: high-pressure pump links to each other with solenoid directional control valve DT II with the solenoid directional control valve DT I of being controlled respectively by two electromagnet by pipeline respectively and communicates.Solenoid directional control valve DT I links to each other by the lift cylinder rear gas chamber of air chamber and lift cylinder before the lift cylinder of two pipelines and lift cylinder respectively again and communicates.Solenoid directional control valve DT II links to each other by the rotary cylinder rear gas chamber of air chamber and rotary cylinder before the rotary cylinder of two pipelines and rotary cylinder respectively again and communicates.
Circuit diagram as shown in Figure 4 is as follows: L contact and N contact connect live wire and the zero line of 220V AC power respectively.The L contact is electrically connected with loop one, loop two, loop three, loop four, loop five and loop six respectively with the N contact.
The L contact is electrically connected with the lid bell button A1 in loop one.The other end of lid bell button A1 is electrically connected with the coil of contactor J1.The two ends of lid bell button A1 are connected in parallel to the normally opened contact J1-1 of the contactor J1 of being connected in series and the normally-closed contact J2-1 of contactor J2.The other end of the coil of contactor J1 is electrically connected with the N contact.
The L contact is electrically connected with the blow-on lid button A2 in loop two.The other end of blow-on lid button A2 is electrically connected with the coil of contactor J2.The two ends of blow-on lid button A2 are connected in parallel to the normally opened contact J2-2 of the contactor J2 of being connected in series and the normally-closed contact J1-2 of contactor J1.The other end of the coil of contactor J2 is electrically connected with the N contact.
The L contact is electrically connected with the spacing contact X1 in loop three.The other end of spacing contact X1 is electrically connected with the coil of contactor J3.The other end of the coil of contactor J3 is electrically connected with the N contact.
The L contact is electrically connected with the spacing contact X2 in loop four.Spacing contact X2 is electrically connected with the coil of contactor J4.The other end of the coil of contactor J4 is electrically connected with the N contact.
The L contact is electrically connected with the normally opened contact J3-1 of the contactor J3 in loop five.The other end of the normally opened contact J3-1 of contactor J3 is electrically connected with the normally-closed contact J2-3 of contactor J2.The other end of the normally-closed contact J2-3 of contactor J2 is electrically connected with solenoid directional control valve DT I, and the other end of solenoid directional control valve DT I is electrically connected with the N contact.
The L contact is electrically connected with the normally opened contact J1-3 of the contactor J1 in loop six.The be connected in parallel normally-closed contact J4-1 of contactor J4 of the two ends of the normally opened contact J1-3 of contactor J1.The other end of the normally opened contact J1-3 of contactor J1 is electrically connected with solenoid directional control valve DT II.The other end of solenoid directional control valve DT II is electrically connected with the N contact.
At ordinary times, two bell button A1, the equal no power of A2, the electromagnet DT I of two solenoid directional control valves, DT II do not have yet.High-pressure pump is not also to two cylinder air feed.Operating personnel can manual blow-on lid or pass bell.
When electric induction furnace need be opened bell because of need of work, connect power supply and high-pressure pump source of the gas.Press blow-on lid button A2 in the loop two.Contactor J2 coil electricity.The normally-closed contact J2-1 of contactor J2 disconnects in the loop one.The normally-closed contact J2-3 of contactor J2 in the loop five disconnects, and solenoid directional control valve DT I is cut off the power supply but air supply channel keeps unimpeded.High pressure gas is by the preceding air chamber confession gases at high pressure of solenoid directional control valve DT I to lift cylinder, and gases at high pressure make the withdrawal of lift cylinder piston rod.Lift cylinder piston rod pulling tranverse connecting rod, because leverage, the inclination brace drives the bell rising and leaves the electric induction furnace fire door.When the lift cylinder piston rod all was retracted in the lift cylinder, bell rose to the extreme higher position, and spacing contact block I and spacing contact block II were touched and made limit switch X2 connection and contactor J4 coil is got this moment.Contactor J4 coil gets the electric normally-closed contact J4-1 that makes the contactor J4 in the loop six and disconnects and make solenoid directional control valve DT II dead electricity, and solenoid directional control valve DT II keeps to rotary cylinder rear gas chamber for gases at high pressure.The gases at high pressure of rotary cylinder rear gas chamber stretch out the rotary cylinder piston rod.Promoting the sleeve rotation when rotary cylinder piston rod stretches out makes the bell rotation that links to each other with sleeve leave electric induction furnace fire door top position.Bell is opened.Spacing contact block I and spacing contact block II also disengage and make limit switch X2 disconnection and make contactor J4 outage during the bell rotation.
When electric induction furnace need cut out bell because of need of work, connect power supply and high-pressure pump source of the gas.Press loop one middle cover bell button A1, contactor J1 energising.The normally-closed contact J1-2 of contactor J1 opens outage and makes contactor J2 outage in the loop two, and contactor J2 outage makes the normally-closed contact J2-3 closure of contactor J2 in the loop five.The normally opened contact J1-3 closure of contactor J1 makes solenoid directional control valve DT II get electric and makes solenoid directional control valve commutation in the loop six, solenoid directional control valve DT II commutation back gases at high pressure enter the preceding air chamber of rotary cylinder, gases at high pressure make the withdrawal of rotary cylinder piston rod, the rotation of rotary cylinder piston rod when withdrawal pulling sleeve, sleeve rotation drivening rod also drives bell and moves and make bell move to induction furnace fire door top.Spacing contact block III and spacing contact block IV were touched and are made limit switch X1 connection in the loop three when piston rod was all withdrawn.Limit switch X1 connects contactor J3 is got.Contactor J3 gets the electric normally opened contact J3-1 closure that makes in the loop five.The normally opened contact J3-1 closure of contactor J3 makes solenoid directional control valve DT I get electric and makes the solenoid directional control valve commutation.Solenoid directional control valve commutation back gases at high pressure enter lift cylinder rear gas chamber.Gases at high pressure are released the lift cylinder piston rod, by leverage bell are moved down when the lift cylinder piston rod stretches out and cover on the fire door of body of heater.So just finished the work of closing bell.The lift cylinder piston rod stretches out put in place time limit position contact block III and spacing contact block IV and disengages limit switch X1 is disconnected, contactor J3 outage, and solenoid directional control valve DT I is also cut off the power supply.
Advantage of the present invention has provided a kind of air control unit of electric induction furnace bell.This control device can open bell fool proof, easily and cut out bell.Can greatly reduce heat energy loss, greatly save the casting cost.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is pneumatic structure schematic diagram of the present invention.
Fig. 4 is electrical schematic diagram of the present invention.
Among the figure: A1 is for covering the bell button, and A2 is blow-on lid button, and X1 is limit switch, and X2 is limit switch, and J1 is the contactor I, and J2 is the contactor II, and J3 is the contactor III, and J4 is the contactor IV, and the DT I is solenoid directional control valve, and the DT II is solenoid directional control valve.
Specific implementation method
As follows as each embodiment shown in the drawings: a kind of air control unit of electric induction furnace bell.
As shown in Figure 1 and Figure 2: at a side installation frame 20 of body of heater 19.At framework 20 middle parts vertical shaft 15 is housed.Sleeve 14 of vertical shaft 15 outside suits.Between vertical shaft 15 and the sleeve 14 bearing 16 is installed, sleeve 14 can be by bearing 16 around vertical shaft 15 rotations.Be welded with connecting rod I 13 in sleeve 14 upper ends, connecting rod I 13 tops flexibly connect by bearing pin I 12 and connecting rod 12.Connecting rod 12 1 ends are inclination brace 17, fixedly connected with big bell 18 in inclination brace 17 ends.Connecting rod 12 other ends are tranverse connecting rod 8.Fixedly connected with sleeve 14 in the lower end of lift cylinder 2, lift cylinder 2 can rotate with the rotation of sleeve 14.Lift cylinder piston rod 5 tops of lift cylinder 2 flexibly connect by bearing pin II 9 and connecting rod II 10.Fixedly connected with tranverse connecting rod 8 ends in connecting rod II 10 upper ends.Be connected with connecting rod III 3 on lift cylinder 2 cylindrical shells, there is the spacing contact block I 4 of limit switch X2 connecting rod III 3 ends, and tranverse connecting rod 8 ends are connected with connecting rod IV 7, and there is the spacing contact block II 6 of limit switch X2 connecting rod IV 7 ends.In the middle of spacing contact block I 4 and the spacing contact block II 6 gap is arranged, spacing contact block I 4 and spacing contact block II 6 are touched mutually and are made limit switch X2 conducting when the lift cylinder piston rod is all withdrawn.Spacing contact block I 4 and spacing contact block II 6 are electrically connected by the coil of lead with L contact and contactor IV respectively.
As shown in Figure 3: high-pressure pump 30 links to each other and communicates with two solenoid directional control valve DT I 31, solenoid directional control valve DT II 34 by two magnet control by pipeline respectively.Solenoid directional control valve DT I 31 links to each other by the lift cylinder rear gas chamber 32 of air chamber 33 and lift cylinder 2 before the lift cylinder of two pipelines and lift cylinder 2 respectively again and communicates.Solenoid directional control valve DT II 34 links to each other by the rotary cylinder rear gas chamber 35 of air chamber 36 and rotary cylinder 1 before the rotary cylinder of two pipelines and rotary cylinder 1 respectively again and communicates.
Circuit diagram as shown in Figure 4 is as follows, and L contact and N contact connect live wire and the zero line of 220V AC power respectively.The L contact is electrically connected with loop 1, loop 2 38, loop 3 39, loop 4 40, loop 5 41 and loop 6 42 respectively with the N contact.
The L contact is electrically connected with the lid bell button A1 in loop 1.The other end of lid bell button A1 is electrically connected with the coil of contactor J2.The two ends of lid bell button A1 are connected in parallel to the normally opened contact J1-1 of the contactor J1 of being connected in series and the normally-closed contact J2-1 of contactor J2.The other end of the coil of contactor J1 is electrically connected with the N contact.
The L contact is electrically connected with the blow-on lid button A2 in loop 2 38.The other end of blow-on lid button A2 is electrically connected with the coil of contactor J2.The two ends of blow-on lid button A2 are connected in parallel to the normally opened contact J2-2 of the contactor J2 of being connected in series and the normally-closed contact J1-2 of contactor J1.The other end of the coil of contactor J2 is electrically connected with the N contact.
The L contact is electrically connected with the spacing contact X1 in loop 3 39.The other end of spacing contact X1 is electrically connected with the coil of contactor J3.The other end of the coil of contactor J3 is electrically connected with the N contact.
The L contact is electrically connected with the spacing contact X2 in loop 4 40.Spacing contact X2 is electrically connected with the coil of contactor J4.The other end of the coil of contactor J4 is electrically connected with the N contact.
The L contact is electrically connected with the normally opened contact J3-1 of the contactor J3 in loop 5 41.The other end of the normally opened contact J3-1 of contactor J3 is electrically connected with the normally-closed contact J2-3 of contactor J2.The other end of the normally-closed contact J2-3 of contactor J2 is electrically connected with solenoid directional control valve DT I, and the other end of solenoid directional control valve DT I is electrically connected with the N contact.
The L contact is electrically connected with the normally opened contact J1-3 of the contactor J1 in loop 6 42.The be connected in parallel normally-closed contact J4-1 of contactor J4 of the two ends of the normally opened contact J1-3 of contactor J1.The other end of the normally opened contact J1-3 of contactor J1 is electrically connected with solenoid directional control valve DT II.The other end of solenoid directional control valve DT II is electrically connected with the N contact.
Claims (1)
1. the control device of an electric induction furnace bell, it is characterized in that: at a side installation frame of body of heater, in frame mid portion vertical shaft is housed, sleeve of the outside suit of vertical shaft is equipped with bearing between vertical shaft and the sleeve, sleeve can rotate around vertical shaft by bearing, be welded with the connecting rod I in the sleeve upper end, connecting rod I top flexibly connects by bearing pin I and connecting rod, and connecting rod one end is the inclination brace, fixedly connected with big bell in inclination brace end, the connecting rod other end is tranverse connecting rod;
Fixedly connected with sleeve in the lower end of lift cylinder, lift cylinder can rotate with the rotation of sleeve, the lift cylinder piston rod top of lift cylinder flexibly connects by bearing pin II and connecting rod II, fixedly connected with the tranverse connecting rod end in connecting rod II upper end, be connected with the connecting rod III on the lift cylinder cylindrical shell, there is the spacing contact block I of limit switch X2 connecting rod III end, the tranverse connecting rod end is connected with the connecting rod IV, there is the spacing contact block II of limit switch X2 connecting rod IV end, one gap is arranged in the middle of spacing contact block I and the spacing contact block II, spacing contact block I and spacing contact block II are touched mutually and are made limit switch X2 conducting when the lift cylinder piston rod is all withdrawn, and spacing contact block I and spacing contact block II are electrically connected by the coil of lead with L contact and contactor IV respectively;
Rotary cylinder also is housed on the framework, the rotary cylinder piston rod end of rotary cylinder flexibly connects by bearing pin III and connecting rod V, the connecting rod V other end is connected by the outer ring of hinge I and sleeve, be connected with the connecting rod VI on the rotary cylinder cylindrical shell, there is the spacing contact block III of limit switch X1 connecting rod VI end, sleeve is connected with the connecting rod VII by the hinge II, there is the spacing contact block IV of limit switch X1 connecting rod VII end, one gap is arranged in the middle of spacing contact block III and the spacing contact block IV, spacing contact block III and spacing contact block IV are touched mutually and are made limit switch X1 conducting when the rotary cylinder piston rod is all withdrawn, and spacing contact block III and spacing contact block IV are electrically connected by the coil of lead with L contact and contactor III respectively;
High-pressure pump links to each other with solenoid directional control valve DT II with the solenoid directional control valve DT I of being controlled respectively by two electromagnet by pipeline respectively and communicates, solenoid directional control valve DT I links to each other by the lift cylinder rear gas chamber of air chamber and lift cylinder before the lift cylinder of two pipelines and lift cylinder respectively again and communicates, and solenoid directional control valve DT II links to each other by the rotary cylinder rear gas chamber of air chamber and rotary cylinder before the rotary cylinder of two pipelines and rotary cylinder respectively again and communicates;
Circuit diagram is as follows: L contact and N contact connect live wire and the zero line of 220V AC power respectively, and the L contact is electrically connected with loop one, loop two, loop three, loop four, loop five and loop six respectively with the N contact;
The L contact is electrically connected with the lid bell button A1 in loop one, the other end of lid bell button A1 is electrically connected with the coil of contactor J1, the two ends of lid bell button A1 are connected in parallel to the normally opened contact J1-1 of the contactor J1 of being connected in series and the normally-closed contact J2-1 of contactor J2, and the other end of the coil of contactor J1 is electrically connected with the N contact;
The L contact is electrically connected with the blow-on lid button A2 in loop two, the other end of blow-on lid button A2 is electrically connected with the coil of contactor J2, the two ends of blow-on lid button A2 are connected in parallel to the normally opened contact J2-2 of the contactor J2 of being connected in series and the normally-closed contact J1-2 of contactor J1, and the other end of the coil of contactor J2 is electrically connected with the N contact;
The L contact is electrically connected with the spacing contact X1 in loop three, and the other end of spacing contact X1 is electrically connected with the coil of contactor J3, and the other end of the coil of contactor J3 is electrically connected with the N contact;
The L contact is electrically connected with the spacing contact X2 in loop four, and spacing contact X2 is electrically connected with the coil of contactor J4, and the other end of the coil of contactor J4 is electrically connected with the N contact;
The L contact is electrically connected with the normally opened contact J3-1 of the contactor J3 in loop five, the other end of the normally opened contact J3-1 of contactor J3 is electrically connected with the normally-closed contact J2-3 of contactor J2, the other end of the normally-closed contact J2-3 of contactor J2 is electrically connected with solenoid directional control valve DT I, and the other end of solenoid directional control valve DT I is electrically connected with the N contact;
The L contact is electrically connected with the normally opened contact J1-3 of the contactor J1 in loop six, the be connected in parallel normally-closed contact J4-1 of contactor J4 of the two ends of the normally opened contact J1-3 of contactor J1, the other end of the normally opened contact J1-3 of contactor J1 is electrically connected with solenoid directional control valve DT II, and the other end of solenoid directional control valve DT II is electrically connected with the N contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210054020 CN102589293B (en) | 2012-03-04 | 2012-03-04 | Control device for cover of electric induction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210054020 CN102589293B (en) | 2012-03-04 | 2012-03-04 | Control device for cover of electric induction furnace |
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| Publication Number | Publication Date |
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| CN102589293A CN102589293A (en) | 2012-07-18 |
| CN102589293B true CN102589293B (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210054020 Expired - Fee Related CN102589293B (en) | 2012-03-04 | 2012-03-04 | Control device for cover of electric induction furnace |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103882213B (en) * | 2014-03-04 | 2017-05-03 | 安徽海纳电缆集团有限公司 | Cable annealing device with adjustable uncovering angle |
| CN103882215A (en) * | 2014-03-04 | 2014-06-25 | 安徽海纳电缆集团有限公司 | Automatic case-opening process for annealing of wires and cables |
| CN105066692B (en) * | 2015-09-08 | 2017-03-22 | 河南省天利工业炉有限公司 | Smoke evacuation and feeding device of induction heating furnace |
| CN110000357A (en) * | 2019-05-05 | 2019-07-12 | 安徽宝裕金属科技有限公司 | A kind of machinery die casting manipulator |
| CN111947466A (en) * | 2019-05-17 | 2020-11-17 | 科华控股股份有限公司 | Furnace cover device of small-sized induction furnace |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1315701B1 (en) * | 2000-05-31 | 2003-03-18 | Borli Engineering Spa | AUTOMATIC DOOR FOR MOLDED METAL MAINTENANCE OVEN |
| CN2692608Y (en) * | 2004-02-04 | 2005-04-13 | 北新建材(集团)有限公司 | Stove lid opening and closing device |
| JP5157482B2 (en) * | 2008-01-29 | 2013-03-06 | Ｊｆｅスチール株式会社 | Coke oven hearth automatic removal method and furnace lid desorption device |
| CN201723527U (en) * | 2010-05-18 | 2011-01-26 | 无锡尚德太阳能电力有限公司 | Air cylinder emergency-stop control system and oxidation furnace door control system with the same |
| CN102049465B (en) * | 2010-12-31 | 2012-09-05 | 溧阳市科华机械制造有限公司 | Sand mixer sand unloading door with auto-lock function |
| CN202470765U (en) * | 2012-03-04 | 2012-10-03 | 溧阳市科华机械制造有限公司 | Control device for furnace cover of electric induction furnace |
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Owner name: KEHUA HOLDING CO., LTD. Free format text: FORMER NAME: LIYANG KEHUA MACHINE MANUFACTURE CO., LTD. Owner name: KEHUA HOLDINGS CO., LTD. Free format text: FORMER NAME: KEHUA HOLDING CO., LTD. |
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Address after: 213354 Jiangsu city of Changzhou province Liyang Zhuze Zhen Yu Qiao Town Patentee after: KEHUA HOLDINGS Co.,Ltd. Address before: 213354 Jiangsu city of Changzhou province Liyang Zhuze Zhen Yu Qiao Town Patentee before: KELONG Holdings Ltd. Address after: 213354 Jiangsu city of Changzhou province Liyang Zhuze Zhen Yu Qiao Town Patentee after: KELONG Holdings Ltd. Address before: 213354 Jiangsu city of Changzhou province Liyang Zhuze Zhen Yu Qiao Town Patentee before: Liyang Kehua Machinary Manufacture Co.,Ltd. |
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