CN102266881B - Stretching-straightening device for online heating-straightening process of magnesium alloy extrusion material - Google Patents
Stretching-straightening device for online heating-straightening process of magnesium alloy extrusion material Download PDFInfo
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- CN102266881B CN102266881B CN 201110194347 CN201110194347A CN102266881B CN 102266881 B CN102266881 B CN 102266881B CN 201110194347 CN201110194347 CN 201110194347 CN 201110194347 A CN201110194347 A CN 201110194347A CN 102266881 B CN102266881 B CN 102266881B
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Abstract
The invention discloses a stretching-straightening device for an online heating-straightening process of a magnesium alloy extrusion material, comprising a stretching-straightening device and a heating device. The stretching-straightening mechanism comprises a bracket, a stretching drive mechanism and a clamping drive mechanism. Double rails are arranged on the bracket. The rail is provided with a chuck I and a chuck II which are matched with the surfaces of the rails in a sliding manner. At least one chuck is capable of sliding forward and backward along the rail direction with the action of the stretching drive device. The chuck I and the chuck II are used for generating clamping forces via the clamping drive mechanism respectively. The heating device comprises a lifting mechanism and a heating mechanism. The heating mechanism comprises a positive clamping electrode, a negative clamping electrode and a transformer. The lifting mechanism is arranged under the double rails. The heating device of the stretching-straightening device is capable of guaranteeing that the extrusion material is expanded freely during heating without generating heat stress. The bending phenomenon caused by the heat stress and the instability phenomenon caused by the combined action of the heat stress and the self gravity are avoided via effective support during heating.
Description
Technical field
The present invention relates to material processing field, particularly a kind of stretching-straightening device for magnesium alloy extrusion on-line heating straightening process.
Background technology
The aligning of magnesium alloy extrusion generally adopts seven-roll Abramsen machine to carry out stretcher leveling.But magnesium alloy at normal temperatures plastic deformation ability is poor, and when squeeze wood original curved degree was larger, the room temperature tensile aligning easily caused the squeeze wood fracture.Equipment for straightening and the technique of magnesium alloy extrusion mainly contain two large classes at present:
Wherein a class is at first squeeze wood to be put into heating furnace to be heated to predetermined temperature, and the magnesium alloy extrusion after will heating is again transferred to seven-roll Abramsen machine and aligned.The technical problem underlying that this technique exists is: squeeze wood length is subject to the heating furnace length restriction; Transfer to the process of seven-roll Abramsen machine after heating furnace takes out, the drop in temperature of magnesium alloy extrusion is large, increases energy resource consumption; Operation is various, increases production cost.
Equations of The Second Kind is at the two ends of seven-roll Abramsen machine anchor clamps positive and negative electrode to be installed, and the other end of this positive and negative electrode links to each other with the transformer that adds.At first with anchor clamps squeeze wood to be aligned is clamped during aligning, the positive and negative electrode and the squeeze wood that are installed in this moment on the anchor clamps pass through the anchor clamps close contact, and form closed circuit by transformer, then switch on and force cooling after squeeze wood is heated to temperature required tension straingtening.The technical problem underlying that this technique exists is: because squeeze wood is clamped by anchor clamps at two ends when heating, when heating, because temperature raises, thermal expansion can occur in squeeze wood, but the clamp weight that connects together with traveling dolly with hydraulic system is larger, the Free Thermal expansion of squeeze wood is restricted, produces thermal stress, cause squeeze wood further crooked; In the straightening temperature scope, unstability to longer bar, under the effect of thermal stress and deadweight, occurs in the magnesium alloy poor rigidity when heating, cause squeeze wood that irregular curved distortion occurs.
In view of this, be necessary to design a kind of stretching-straightening device for magnesium alloy extrusion on-line heating straightening process, bending and the unstable phenomenon that can avoid prior art to cause.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of stretching-straightening device for magnesium alloy extrusion on-line heating straightening process, effectively solved the unstable phenomenon that bending that existing In Situ Heating straightening technology causes because of thermal stress and thermal stress and deadweight acting in conjunction cause.
The objective of the invention is to be achieved through the following technical solutions:
The stretching-straightening device of magnesium alloy extrusion on-line heating straightening process be should be used for, stretching-straightening device and heater comprised;
Described tension straingtening mechanism comprises frame, stretching driving mechanism and clamping drive mechanism, be provided with double track on the described frame, be provided with the chuck I and the chuck II that are slidingly matched with raceway surface on the described track, under the effect of tensile driving device, slide in the front and back of at least one chuck generation direction along ng a path; Described chuck I and chuck II produce clamping force by clamping drive mechanism respectively;
Described heater comprises lifting mechanism and heating arrangements, described heating arrangements comprises positive and negative holding electrode and transformer, two lead-out terminals of described transformer are connected respectively positive and negative holding electrode, described lifting mechanism be arranged on double track under, be used for magnesium alloy profiles that heating is finished and be lifted to superjacent air space between the double track from the lower side space between the frame double track, finish clamping to section bar by chuck I and chuck II;
Described heater also comprises be used to the insulation carrying roller of putting section bar to be processed, the quantity of described insulation carrying roller is at least two and be arranged between the below or double track of double track with mode correspondence arranged side by side along the length direction of double track, when the insulation carrying roller is arranged on the below of double track, its plane, place and double track place plane parallel; When the insulation carrying roller was arranged between the double track, its plane, place and double track were in same plane.
A kind of set-up mode as the insulation carrying roller, further, described insulation carrying roller is arranged on the below of double track, lifting mechanism is according to the lifting equilibrium relation, be arranged between the adjacent insulation carrying roller, the quantity of lifting mechanism is at least one, each lifting mechanism include one vertically up and down pass through motor or hydraulically powered lifting arm, the spill that adapts with squeeze wood shape to be aligned, size can be arranged in the top that described lifting arm contacts with squeeze wood to be aligned.
Another kind of set-up mode as the insulation carrying roller, further, described insulation carrying roller is arranged between the double track, its mounting means is to be respectively arranged with along its length horizontally extending guide groove at the relative medial surface of double track, the two ends of described insulation carrying roller embed respectively guide groove inner realize fixing, described have at least offer the breach that at least one carrying roller that is used for insulating is packed into or shifted out on the side guidance;
Described lifting mechanism comprises two lifting carrying rollers, and described lifting carrying roller adopts the mode parallel with the insulated holding roll axis to be installed in termination, the two ends edge of two side guidances and all insulate carrying roller all between two lifting carrying rollers; Described lifting carrying roller comprises rotating shaft, the two ends of described rotating shaft are separately fixed between two guide rails, the middle part of described rotating shaft is fixed with a support bar perpendicular to rotating shaft, the front end of described support bar is equipped with a roller, be provided with the ring-type bracket concentric with roller on the wheel face of described roller, from the center of lifting carrying roller to the ultimate range of eccentric wheel bracket more than or equal to from the center of lifting carrying roller to the distance of the lower surface of its corresponding chuck I or II.
Further, the rotating shaft of described lifting carrying roller drives by drive motors, and the lift height of described lifting carrying roller detects by position sensor;
Further, described tensile driving device is the hydraulic tensioning oil cylinder, and described hydraulic tensioning oil cylinder is arranged on the tip position of corresponding double track one end on the frame, and the stretching bar of hydraulic tensioning oil cylinder is fixedly connected with near chuck;
Further, an end of described frame is provided with gripper shoe, and the cylinder body of described hydraulic tensioning oil cylinder is fixedly connected with gripper shoe;
Further, described driving clamping device is clamping cylinder I and clamping cylinder II, described clamping cylinder I and clamping cylinder II arrange respectively with chuck I and chuck II on;
Further, described heater also comprises for the temperature meter of measuring the section bar temperature;
Further, described device also comprises the master control unit, and the control end of described stretching driving mechanism, clamping drive mechanism and transformer all links with the master control unit and realizes centralized Control by the master control unit;
Further, described device also comprises the master control unit, and the rotary drive motor of described stretching driving mechanism, clamping drive mechanism, transformer, lifting carrying roller and the control end of lift height position sensor all link with the master control unit and realize centralized Control by the master control unit.
The invention has the beneficial effects as follows:
1. the heater of this device can guarantee that squeeze wood is in heating free wxpansion, do not produce thermal stress, when heating by effective clamping, can free wxpansion, thus the unstable phenomenon of avoiding the buckling phenomenon that causes because of thermal stress and thermal stress and deadweight acting in conjunction to cause;
2. support section bar by nonconducting ganoid carrying roller, thereby increase the rigidity of squeeze wood, guarantee that further unstability does not occur for it when heating, and then improve section quality;
3. can make the squeeze wood that is heated to predetermined temperature be elevated to suitable height by lifting mechanism, and pass through the anchor clamps clamping of stretching-straightening device, then lifting mechanism drops to original position, simplifies the operation thereby reach, the purpose of avoiding personnel to scald;
4. original the sort of on-line heating system, because the effect of thermal stress, cause the material unstability, the amount of deflection of material changes, thereby can not automation align, and by adopting device of the present invention, owing to avoided the generation of thermal stress, increased again rigidity, thus can unstability, and the amount of deflection of material can change in heating process hardly, therefore when aligning, the original amount of deflection take squeeze wood to be processed determined of stretching displacement as foundation, can be determined the aligning stretching displacement by program in advance, carry out the automation aligning.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain from the practice of the present invention instruction.Target of the present invention and other advantages can realize and obtain by following specification and claims.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the side-looking structural representation of embodiments of the invention one;
Fig. 2 is the plan structure schematic diagram of embodiments of the invention one;
Fig. 3 is the guide rail structure sketch of embodiments of the invention two;
Fig. 4 is the roller structure schematic diagram of the lifting carrying roller of embodiment two;
Fig. 5 is for adopting the schematic diagram of eccentric wheel structure;
Fig. 6 is that Fig. 5 is along A to schematic diagram.
The specific embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
Embodiment one
As shown in Figure 1, 2, the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process of the present invention comprises stretching-straightening device and heater;
Tension straingtening mechanism comprises frame 1, stretching driving mechanism 2 and clamping drive mechanism, is provided with double track 4 on the frame, is provided with the chuck I 5 and the chuck II 6 that are slidingly matched with raceway surface on the track.
In the present embodiment, tensile driving device 2 is the hydraulic tensioning oil cylinder, and the hydraulic tensioning oil cylinder is arranged on the tip position of corresponding double track one end on the frame 1, and the stretching bar of stretching oil cylinder is fixedly connected with chuck I 5.Under the effect of tensile driving device 2, the front and back of direction along ng a path occur and slide in chuck I 5; One end of frame 1 is provided with gripper shoe 13, and the cylinder body of hydraulic tensioning oil cylinder is fixedly connected with gripper shoe to be realized fixing.In order to guarantee range of stretch, in tension straingtening mechanism, also be provided with stay wire displacement sensor, be used for the stretching displacement upper limit is set, draw speed can be controlled by the motor of stretching oil cylinder.
Chuck I 5 and chuck II 6 produce clamping force by clamping drive mechanism respectively; In the present embodiment, driving clamping device is clamping cylinder I 7 and clamping cylinder II 8, clamping cylinder I and clamping cylinder II arrange respectively with chuck I and chuck II on.In the present embodiment, chuck I and chuck II adopt common copper electrode material to make, and can certainly adopt other special substances, but volume to be done little, thereby alleviate its weight.
Heater comprises lifting mechanism 9 and heating arrangements, heating arrangements comprises positive holding electrode 10, negative holding electrode 11 and transformer 12, two lead-out terminals of transformer 12 are connected respectively positive and negative holding electrode, and described positive and negative holding electrode is used for being connected to the two ends of squeeze wood to be processed; Lifting mechanism 9 be arranged on double track under, be used for magnesium alloy profiles that heating is finished and be lifted to superjacent air space between the double track from the lower side space between the frame double track, finish clamping to section bar by chuck I and chuck II.
In the present embodiment, heater also comprises be used to the insulation carrying roller 14 of putting section bar to be processed, the insulation carrying roller adopts the minimum smooth insulation carrying roller of coefficient of friction, the quantity of insulation carrying roller 14 is at least two and be arranged at the below of double track, insulation carrying roller plane, 14 place and double track place plane parallel along the length direction of double track with mode correspondence arranged side by side; Lifting mechanism 9 is arranged between the adjacent insulation carrying roller according to the lifting equilibrium relation.As further improvement, this insulation carrying roller can also be designed to the structure that can rotate around fixed axis, and two of fixed axis is fixed on the support, thereby is convenient to the movement of material.
Generally speaking, the setting of lifting mechanism is the length according to material to be aligned, about 1/2 the position that is arranged on the length of material to be aligned gets final product, the quantity of lifting mechanism determines as required, for keeping the balance of material to be aligned in lifting process, can be set to the notch plate that material shape to be aligned, size adapt with material contact portion to be aligned on the lifting mechanism, when two above lifting mechanisms are arranged, the driving mechanism of these two lifting mechanisms can be with one, thereby keeps the uniformity of its action.In the present embodiment, lifting mechanism adopts two hydraulic mechanisms, each hydraulic mechanism to include vertically up and down a hydraulic lifting bar, and two hydraulic lifting bars lay respectively between two insulation carrying rollers of two insulation carrying rollers of head end and tail ends.
As further improvement, in order to guarantee straightening temperature in 150 ℃-300 ℃ scope, heater also comprises for the temperature meter of measuring the section bar temperature.
In order to realize centralized Control, improve the automaticity of whole table apparatus, as improvement, this device also comprises the master control unit, and the control end of described stretching driving mechanism, clamping drive mechanism and transformer all links with the master control unit and realizes centralized Control by the master control unit.
Embodiment two
Shown in Fig. 3,4, the difference of present embodiment and embodiment one is: the insulation carrying roller is arranged between the double track, its mounting means is to be respectively arranged with along its length horizontally extending guide groove 15 at the relative medial surface of double track, the two ends of insulation carrying roller embed respectively inner realization of guide groove and fix, and have at least to offer the breach 16 that at least one is packed into or shift out for the carrying roller that will insulate on the side guidance; By such structure, carrying roller can take off very easily, set up, and can be according to the packing density of the length specification adjustment of material to be aligned insulation carrying roller.
Lifting mechanism comprises two lifting carrying rollers 17, and lifting carrying roller 17 adopts the mode parallel with the insulated holding roll axis to be installed in termination, the two ends edge of two side guidances and all insulate carrying roller all between two lifting carrying rollers; The lifting carrying roller comprises rotating shaft 18, the two ends of rotating shaft 18 are separately fixed between two guide rails, the middle part of rotating shaft is fixed with a support bar 19 perpendicular to rotating shaft, the front end of described support bar is equipped with the roller 20 of an insulation, be provided with the ring-type bracket 21 concentric with roller on the wheel face of roller 20, from the center of lifting carrying roller to the ultimate range of eccentric wheel bracket more than or equal to from the center of lifting carrying roller to the distance of the lower surface of its corresponding chuck I or II (the present embodiment, this position relationship is taken as equal), this ring-type bracket can arrange semicircle according to the shape of material to be aligned, shape or size that rectangle etc. and material to be aligned adapt.
The rotating shaft of lifting carrying roller drives by drive motors 22, and the lift height of lifting carrying roller detects by position sensor.During use, rotating shaft rotates in driven by motor, its ring-type bracket 21 contacts with squeeze wood to be processed and squeeze wood is held up, when the surface of roller 20 rotates to the contour plane of chuck, motor stops operating, live to be aligned paper material clamping with chuck this moment, and this moment, motor rotated again, made roller 20 get back to original position.
Certainly, the design of this support bar, roller and ring-type bracket can also develop into other shapes, and the eccentric wheel structure shown in Fig. 5,6 etc. only otherwise break away from protection scope of the present invention, all belong within the category that is equal to replacement.
Use procedure of the present invention is as follows:
1) magnesium alloy extrusion is placed on the smooth insulation carrying roller, positive and negative holding electrode is clamped in the two ends of magnesium alloy extrusion, form the closed-loop path by transformer, wire, energising is heated to predetermined temperature, can be by regulating the large and small firing rate of regulating of electric current in the heating process;
2) start simultaneously one or more lifting mechanisms, squeeze wood is elevated to suitable height, block heating power supply, take off positive and negative electrode, with the two ends of chuck I and chuck II Quick-clamped squeeze wood, lifting mechanism is got back to the home position, aligns with stretching-straightening device;
3) after tension straingtening is finished, by air-cooled or water-cooled, make squeeze wood force to unclamp clamping behind the cool to room temperature, unload the workpiece behind the aligning, machine.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. be used for the stretching-straightening device of magnesium alloy extrusion on-line heating straightening process, it is characterized in that: described device comprises tension straingtening mechanism and heater;
Described tension straingtening mechanism comprises frame, stretching driving mechanism and clamping drive mechanism, be provided with double track on the described frame, be provided with the chuck I and the chuck II that are slidingly matched with raceway surface on the described double track, under the effect of stretching driving mechanism, slide in the front and back of at least one chuck generation direction along ng a path; Described chuck I and chuck II produce clamping force by clamping drive mechanism respectively;
Described heater comprises lifting mechanism and heating arrangements, described heating arrangements comprises positive and negative holding electrode and transformer, two lead-out terminals of described transformer are connected respectively positive and negative holding electrode, described lifting mechanism is arranged on the below of double track, be used for magnesium alloy profiles that heating is finished and be lifted to superjacent air space between the double track from the lower side space between the frame double track, finish clamping to section bar by chuck I and chuck II;
Described heater also comprises be used to the insulation carrying roller of putting section bar to be processed, the quantity of described insulation carrying roller is at least two and be arranged between the below or double track of double track with mode correspondence arranged side by side along the length direction of double track, when the insulation carrying roller is arranged on the below of double track, its plane, place and double track place plane parallel; When the insulation carrying roller was arranged between the double track, its plane, place and double track were in same plane.
2. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 1, it is characterized in that: described insulation carrying roller is arranged on the below of double track, lifting mechanism is according to the lifting equilibrium relation, be arranged between the adjacent insulation carrying roller, the quantity of lifting mechanism is at least one, each lifting mechanism include one vertically up and down pass through motor or hydraulically powered lifting arm, the spill that adapts with squeeze wood shape to be aligned, size is arranged at the top that described lifting arm contacts with squeeze wood to be aligned.
3. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 1, it is characterized in that: described insulation carrying roller is arranged between the double track, its mounting means is to be respectively arranged with along its length horizontally extending guide groove at the relative medial surface of double track, the two ends of described insulation carrying roller embed respectively inner realization of guide groove and fix, and have at least to offer the breach that at least one is packed into or shift out for the carrying roller that will insulate on the side guidance;
Described lifting mechanism comprises two lifting carrying rollers, and described lifting carrying roller adopts the mode parallel with the insulated holding roll axis to be installed in termination, the two ends edge of two side guidances and all insulate carrying roller all between two lifting carrying rollers; Described lifting carrying roller comprises rotating shaft, the two ends of described rotating shaft are separately fixed between two guide rails, the middle part of described rotating shaft is fixed with a support bar perpendicular to rotating shaft, the front end of described support bar is equipped with the roller of an insulation, be provided with the ring-type bracket concentric with roller on the wheel face of described roller, from the center of lifting carrying roller to the distance of roller bracket greater than from the center of lifting carrying roller to the distance of the lower surface of its corresponding chuck I or chuck II.
4. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 3, it is characterized in that: the rotating shaft of described lifting carrying roller drives by drive motors, and the lift height of described lifting carrying roller detects by position sensor.
5. according to claim 1 to 4 arbitrary described stretching-straightening devices for magnesium alloy extrusion on-line heating straightening process, it is characterized in that: described stretching driving mechanism is the hydraulic tensioning oil cylinder, described hydraulic tensioning oil cylinder is arranged on the tip position of corresponding double track one end on the frame, and the stretching bar of hydraulic tensioning oil cylinder is fixedly connected with near chuck.
6. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 5, it is characterized in that: an end of described frame is provided with gripper shoe, and the cylinder body of described hydraulic tensioning oil cylinder is fixedly connected with gripper shoe.
7. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 1, it is characterized in that: described clamping drive mechanism is clamping cylinder I and clamping cylinder II, and described clamping cylinder I and clamping cylinder II are arranged at respectively on chuck I and the chuck II.
8. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 1 is characterized in that: described heater also comprises for the temperature meter of measuring the section bar temperature.
9. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 1, it is characterized in that: described stretching-straightening device also comprises the master control unit, and the control end of described stretching driving mechanism, clamping drive mechanism and transformer all links with the master control unit and realizes centralized Control by the master control unit.
10. the stretching-straightening device for magnesium alloy extrusion on-line heating straightening process according to claim 4, it is characterized in that: described stretching-straightening device also comprises the master control unit, and the rotary drive motor of described stretching driving mechanism, clamping drive mechanism, transformer, lifting carrying roller and the control end of lift height position sensor all link with the master control unit and realize centralized Control by the master control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110194347 CN102266881B (en) | 2011-07-12 | 2011-07-12 | Stretching-straightening device for online heating-straightening process of magnesium alloy extrusion material |
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| CN 201110194347 CN102266881B (en) | 2011-07-12 | 2011-07-12 | Stretching-straightening device for online heating-straightening process of magnesium alloy extrusion material |
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| CN102266881B true CN102266881B (en) | 2013-04-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102925830B (en) * | 2012-10-16 | 2014-06-11 | 西南石油大学 | Magnesium alloy rapid aging and stretcher straightening synchronous compound technology |
| CN103216573B (en) * | 2013-05-06 | 2015-09-23 | 东北大学 | A kind of method utilizing radoal heating to suppress rotor oscillation |
| CN103846325B (en) * | 2014-04-03 | 2015-06-10 | 倪海霞 | U-shaped furnace pipe bending process for carrying out heating fluid heating and carrying out ejection and material returning |
| CN104438457A (en) * | 2014-11-28 | 2015-03-25 | 广西南南铝加工有限公司 | Method for improving flatness of aluminum alloy board |
| CN104399783B (en) * | 2014-12-26 | 2016-08-31 | 辽宁忠旺机械设备制造有限公司 | A kind of seven-roll Abramsen machine and tension straingtening method |
| CN104588448A (en) * | 2015-01-12 | 2015-05-06 | 湖州华利铝业有限公司 | Aluminum section material straightening device |
| CN106944502A (en) * | 2017-02-14 | 2017-07-14 | 山东银光钰源轻金属精密成型有限公司 | A kind of magnesium alloy profiles straightening equipment and its straightening technology |
| CN107574393A (en) * | 2017-10-27 | 2018-01-12 | 山东省科学院新材料研究所 | A kind of magnesium alloy long and straight type material burning optimization on line straightener and method for aligning |
| CN107675114A (en) * | 2017-11-06 | 2018-02-09 | 山东省科学院新材料研究所 | A kind of magnesium alloy profiles heat treatment deformity control device and control method |
| CN114433653B (en) * | 2020-11-02 | 2023-04-21 | 宝钢金属有限公司 | Thermal straightening and aging integrated treatment method for magnesium alloy extruded profile |
| CN114178352B (en) * | 2021-12-10 | 2023-05-26 | 浙江海洋大学 | Correcting device for correcting steel structure |
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Effective date of registration: 20191211 Address after: Room 317, No.51 majiaao, Heishan Town, Wansheng Economic Development Zone, Chongqing 400802 Patentee after: Chongqing Yuhua New Materials Technology Co., Ltd. Address before: 400044 Shapingba District Sha Street, No. 174, Chongqing Patentee before: Chongqing University |