CN223381444U - Stirring structure - Google Patents
Stirring structureInfo
- Publication number
- CN223381444U CN223381444U CN202422833162.5U CN202422833162U CN223381444U CN 223381444 U CN223381444 U CN 223381444U CN 202422833162 U CN202422833162 U CN 202422833162U CN 223381444 U CN223381444 U CN 223381444U
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- transmission shaft
- reaction kettle
- glass reaction
- assembly
- stirring
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Abstract
The utility model relates to the technical field of glass reaction kettles and discloses a stirring structure, which comprises a glass reaction kettle, a stirring assembly and a disassembly and assembly, wherein the stirring assembly is arranged on the outer side of a second transmission shaft and can enable reactants in the glass reaction kettle to be fully mixed after preheating, and the disassembly and assembly is arranged at the edge of the bottom of a sealing top cover and is convenient to butt joint with the glass reaction kettle. The stirring assembly is driven by the driving assembly to rotate in the opposite direction to the scraping plate assembly, so that the flow direction of reactants in the glass reaction kettle can be disturbed, the reactants are mixed more fully, the stirring assembly is matched with the heating assembly to stir the reactants in the glass reaction kettle, the reactants in all positions in the glass reaction kettle are heated uniformly, the quality of a final product is improved, the reactants adhered to the inner wall of the glass reaction kettle can be scraped by the scraping plate assembly, the reactants are participated in the stirring process again, and the mixing effect of the reactants is further improved.
Description
Technical Field
The utility model relates to the technical field of glass reaction kettles, in particular to a stirring structure.
Background
The glass reaction kettle is laboratory equipment for chemical reaction and material synthesis, has the characteristics of high transparency, high temperature resistance, corrosion resistance, no pollution and the like, can perform stirring reaction under the set constant temperature condition and normal pressure or negative pressure condition, can control the reflux and evaporation of solution, and is generally provided with a stirring structure inside so as to ensure that reactants are fully mixed, thereby improving the efficiency of chemical reaction and the quality of products.
When the stirring structure is used, the stirring paddle board cannot be in direct contact with the inner wall of the kettle body, so that a part of reactants are inevitably adhered to the inner wall of the kettle body, the mixing efficiency and the mixing effect of the reactants are reduced, meanwhile, the kettle body can control the temperature of the reactants in the kettle body by circulating a heat source medium in an external interlayer, the temperature of the reactants in the center of the kettle body is inconsistent with the temperature of the reactants in the inner wall of the kettle body in an external-to-internal heating mode, and the inconsistent reaction progress between the inner layer and the outer layer of the kettle body is formed, so that the quality of a final product is affected to a certain extent.
Disclosure of utility model
The present utility model is directed to a stirring structure for solving the above-mentioned problems.
In order to achieve the purpose, the utility model provides the technical scheme that the stirring structure comprises a glass reaction kettle, and further comprises a sealing top cover matched with the glass reaction kettle, wherein a supporting machine table is coaxially arranged at the top of the sealing top cover, a second transmission shaft is rotatably connected to the bottom of an inner cavity of the supporting machine table, and the second transmission shaft is of a hollow design and further comprises:
The stirring assembly is arranged outside the second transmission shaft and can fully mix reactants in the glass reaction kettle after preheating, a third transmission shaft is rotatably connected in the second transmission shaft, a scraping plate assembly for preventing the reactants from adhering to the inner wall of the glass reaction kettle is arranged at the bottom end of the third transmission shaft, and a driving assembly capable of enabling the stirring assembly and the scraping plate assembly to reversely rotate is arranged at the top end of the second transmission shaft;
The device is characterized in that the device is arranged at the edge of the bottom of the sealing top cover and is convenient to dock with a glass reaction kettle, a heating component for improving the temperature of reactants is arranged on the outer side of the glass reaction kettle, a feed inlet is arranged at the top of one side of the sealing top cover, a discharge outlet is arranged at the bottom of an inner cavity of the glass reaction kettle, and an electromagnetic valve is arranged in the discharge outlet.
Preferably, the stirring assembly comprises a first stirring paddle board arranged inside the glass reaction kettle, the first stirring paddle board is provided with at least two stirring paddle boards, one end of the first stirring paddle board is connected with the second transmission shaft, an electric heating wire is fixedly arranged inside the first stirring paddle board, an electric conduction slip ring is arranged at the bottom of an inner cavity of the supporting machine, an electric conduction slip ring stator is connected with the bottom surface of the supporting machine through a bolt, an electric conduction slip ring rotor is connected with the second transmission shaft, the electric heating wire is connected with an electric conduction slip ring output end through a wire, and a temperature controller is fixedly arranged on one side of the supporting machine and connected with the input end of the electric conduction slip ring through the wire.
Preferably, the scraper assembly comprises a first reinforcing sleeve arranged below the second transmission shaft, the first reinforcing sleeve is fixedly arranged outside the third transmission shaft, L-shaped rods are fixedly connected to two sides of the first reinforcing sleeve, a plurality of second stirring paddles are symmetrically arranged on one side of each L-shaped rod towards the second transmission shaft, scraping strips are fixedly connected to the other side of each L-shaped rod, and the outer sides of the scraping strips are in contact with the inner wall of the glass reaction kettle.
Preferably, the fixing seat is fixedly connected to the outer side of the second transmission shaft, the second reinforcing sleeve is rotationally connected to the outer side of the fixing seat, the connecting rod is vertically installed at the top end of the L-shaped rod, and one end of the connecting rod is connected with the second reinforcing sleeve.
Preferably, the driving assembly comprises a motor fixed at the top of the supporting machine, the top end of the second transmission shaft penetrates through the supporting machine to be connected with the output end of the motor, a driving bevel gear is fixedly connected to the outer side of the second transmission shaft, a driven bevel gear is fixedly connected to the outer side of the third transmission shaft, a transmission bevel gear is arranged between the driven bevel gear and the driving bevel gear, a first transmission shaft is fixedly connected to one side of the transmission bevel gear, one end of the first transmission shaft is rotatably connected with the supporting machine, and the transmission bevel gear is meshed with the driving bevel gear and the driven bevel gear respectively.
Preferably, the dismouting subassembly is including being fixed in the first butt joint flange of sealed top cap bottom, glass reation kettle top fixedly connected with second butt joint flange, the mounting groove has all been seted up to second butt joint flange top, first butt joint flange bottom, the inside sealing washer that is equipped with of mounting groove, link to each other through the bolt between first butt joint flange and the second butt joint flange.
Preferably, the heating component comprises a hollow interlayer arranged on the outer side of the glass reaction kettle, a heat source medium inlet is formed in the top of one side of the hollow interlayer, and a heat source medium outlet is formed in the bottom of the hollow interlayer.
Compared with the prior art, the utility model has the following beneficial effects:
The stirring assembly is driven by the driving assembly to rotate in the opposite direction to the scraping plate assembly, so that the flow direction of reactants in the glass reaction kettle can be disturbed, the reactants are mixed more fully, the stirring assembly is matched with the heating assembly to stir the reactants in the glass reaction kettle, the reactants in all positions in the glass reaction kettle are heated uniformly, the quality of a final product is improved, the reactants adhered to the inner wall of the glass reaction kettle can be scraped by the scraping plate assembly, the reactants are participated in the stirring process again, and the mixing effect of the reactants is further improved.
Drawings
FIG. 1 is a schematic structural view of a stirring structure provided by the utility model;
FIG. 2 is a schematic view of a stirring assembly according to the present utility model;
FIG. 3 is an enlarged schematic view of the structure of FIG. 2A;
FIG. 4 is an enlarged schematic view of the structure of FIG. 2B;
FIG. 5 is a schematic view of a scraper assembly according to the present utility model;
Fig. 6 is a schematic diagram of a specific structure of an electric heating wire provided by the utility model.
In the figure, 1, a glass reaction kettle; 2, a sealing top cover, 3, a dismounting assembly, 31, a first butt flange, 32, a sealing gasket, 33, a mounting groove, 34, a second butt flange, 4, a feed inlet, 5, a discharge outlet, 6, a heating assembly, 61, a hollow interlayer, 62, a heat source medium inlet, 63, a heat source medium outlet, 7, a supporting machine table, 8, a driving assembly, 81, a motor, 82, a first transmission shaft, 83, a driving bevel gear, 84, a driven bevel gear, 85, a transmission bevel gear, 9, a second transmission shaft, 10, a third transmission shaft, 11, a stirring assembly, 111, a first stirring paddle board, 112, an electric heating wire, 113, a conductive slip ring, 114, a temperature controller, 12, a scraping plate assembly, 121, a first reinforcing sleeve, 122, an L-shaped rod, 123, a scraping strip, 124, a second stirring paddle board, 13, a connecting rod, 14, a fixed seat, 15 and a second reinforcing sleeve.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to FIGS. 1-6, the stirring structure comprises a glass reaction kettle 1, a sealing top cover 2 matched with the glass reaction kettle 1 is arranged at the top of the glass reaction kettle 1, a supporting machine table 7 is coaxially arranged at the top of the sealing top cover 2, a second transmission shaft 9 is rotatably connected to the bottom of an inner cavity of the supporting machine table 7, the second transmission shaft 9 is of a hollow design, and the stirring structure further comprises a stirring assembly 11 which is arranged outside the second transmission shaft 9 and can enable reactants in the glass reaction kettle 1 to be fully mixed after being preheated, and the stirring assembly 11 is arranged, so that on one hand, the reactants in the glass reaction kettle 1 can be fully mixed, and on the other hand, the reactants can be heated outwards from the inside of the glass reaction kettle 1 to promote reaction; the second transmission shaft 9 is internally and rotatably connected with a third transmission shaft 10, the bottom end of the third transmission shaft 10 is provided with a scraping plate component 12 for preventing reactants from adhering to the inner wall of the glass reaction kettle 1, the reactants adhering to the inner wall of the glass reaction kettle 1 can be scraped by arranging the scraping plate component 12, and can be participated in the stirring process again, so that the mixing effect of the reactants is improved, the top end of the second transmission shaft 9 is provided with a driving component 8 which can enable the stirring component 11 and the scraping plate component 12 to reversely rotate, the driving component 8 can drive the stirring component 11 and the scraping plate component 12 to rotate in the opposite direction, the flow direction of the reactants in the glass reaction kettle 1 can be disturbed, the mixing between the reactants is more sufficient, so that the mixing effect of the reactants is further improved, the dismounting component 3 which is arranged at the bottom edge of the sealing top cover 2 and is convenient to butt joint with the glass reaction kettle 1 is convenient for splitting and assembling the glass reaction kettle 1 and the sealing top cover 2 by arranging the dismounting component 3, the glass reaction kettle 1 is convenient to clean, maintain and overhaul, and has high practicability, the heating component 6 for improving the temperature of reactants is arranged on the outer side of the glass reaction kettle 1, the temperature of the reactants in the glass reaction kettle 1 is controlled by using a circulating heat source medium through arranging the heating component 6, so that the optimal reaction environment can be provided according to the actual condition of the reactants, the top of one side of the sealing top cover 2 is provided with the feed inlet 4, the bottom of the inner cavity of the glass reaction kettle 1 is provided with the discharge outlet 5, and the electromagnetic valve is arranged in the discharge outlet 5.
The stirring assembly 11 comprises a first stirring paddle board 111 arranged in the glass reaction kettle 1, at least two first stirring paddle boards 111 are arranged, one end of each first stirring paddle board 111 is connected with the second transmission shaft 9, an electric heating wire 112 is fixedly arranged in each first stirring paddle board 111, a conductive slip ring 113 is arranged at the bottom of an inner cavity of each supporting machine 7, a stator of each conductive slip ring 113 is connected with the bottom surface of each supporting machine 7 through bolts, a rotor of each conductive slip ring 113 is connected with the second transmission shaft 9, each electric heating wire 112 is connected with the output end of each conductive slip ring 113 through a wire, each conductive slip ring 113 is arranged, the electric heating wire 112 is provided with stable electric power, wires at two ends of each electric heating wire 112 can rotate together with each conductive slip ring 113, so that wire twisting caused by rotation of the second transmission shaft 9 is avoided, the rationality of the structure is improved, a temperature controller 114 is fixedly arranged on one side of each supporting machine 7, the temperature controller 114 is connected with the input end of each conductive slip ring 113 through the wires, and during the period, the temperature controller 114 is used for fully mixing reactants, as shown in fig. 2 and 6, the temperature of each first paddle board 111 outside the second transmission shaft 9 can be used for heating the electric heating wire 112, and the reactants are controlled and the inside the glass reaction kettle 1, so that the reaction is heated.
The scraper assembly 12 comprises a first reinforcing sleeve 121 arranged below the second transmission shaft 9, the first reinforcing sleeve 121 is fixedly arranged on the outer side of the third transmission shaft 10, two sides of the first reinforcing sleeve 121 are fixedly connected with L-shaped rods 122, a plurality of second stirring paddles 124 are symmetrically arranged on one side of each L-shaped rod 122, which faces the second transmission shaft 9, of each L-shaped rod 122, scraping strips 123 are fixedly connected on the other side of each L-shaped rod 122, the outer sides of the scraping strips 123 are contacted with the inner wall of the glass reaction kettle 1, as shown in fig. 2 and 5, the first reinforcing sleeve 121 is driven to rotate by the aid of the third transmission shaft 10, the first reinforcing sleeve 121 drives the L-shaped rods 122 to rotate through the L-shaped rods 122, at the moment, the second stirring paddles 124 on one side of each L-shaped rod 122 are matched with the first stirring paddles 111 to uniformly mix reactants, the mixing effect of the reactants is improved, the scraping strips 123 on the other side of each L-shaped rod 122 scrape the reactants adhered on the inner wall of the glass reaction kettle 1, the reactants are participated in the stirring process again, and the mixing effect of the reactants is further improved.
The fixing base 14 is fixedly connected to the outer side of the second transmission shaft 9, the second reinforcing sleeve 15 is rotationally connected to the outer side of the fixing base 14, the connecting rod 13 is vertically arranged at the top end of the L-shaped rod 122, one end of the connecting rod 13 is connected with the second reinforcing sleeve 15, and the second reinforcing sleeve 15 and the connecting rod 13 are arranged to support the second stirring paddle board 124 and the scraping strip 123 from the top end of the L-shaped rod 122, so that the second stirring paddle board 124 and the scraping strip 123 work more stably, and the stability of the whole structure is improved.
The driving assembly 8 comprises a motor 81 fixed at the top of the supporting machine 7, the top end of a second transmission shaft 9 penetrates through the supporting machine 7 and is connected with the output end of the motor 81, a driving bevel gear 83 is fixedly connected to the outer side of the second transmission shaft 9, a driven bevel gear 84 is fixedly connected to the outer side of a third transmission shaft 10, a transmission bevel gear 85 is arranged between the driven bevel gear 84 and the driving bevel gear 83, a first transmission shaft 82 is fixedly connected to one side of the transmission bevel gear 85, one end of the first transmission shaft 82 is rotatably connected with the supporting machine 7, the transmission bevel gear 85 is respectively meshed with the driving bevel gear 83 and the driven bevel gear 84, as shown in fig. 2 and 3, the driving bevel gear 83 is driven to rotate by the motor 81, and the driven bevel gear 84 is driven by the transmission bevel gear 85 to rotate the outer side of the third transmission shaft 10, so that the stirring assembly 11 and the scraping assembly 12 rotate in opposite directions, the flow direction of reactants inside the glass reaction kettle 1 can be disturbed, and the mixing between the reactants can be more sufficient.
The dismouting subassembly 3 is including being fixed in the first butt joint flange 31 of sealed top cap 2 bottom, glass reation kettle 1 top fixedly connected with second butt joint flange 34, mounting groove 33 has all been seted up to second butt joint flange 34 top, first butt joint flange 31 bottom, the inside sealing washer 32 that is equipped with of mounting groove 33, link to each other through the bolt between first butt joint flange 31 and the second butt joint flange 34, as shown in fig. 2, fig. 4, through setting up first butt joint flange 31, second butt joint flange 34, be convenient for carry out the split equipment to glass reation kettle 1, sealed top cap 2, the convenience is to stirring subassembly 11, scraper blade subassembly 12 is clean maintenance.
The heating component 6 comprises a hollow interlayer 61 arranged on the outer side of the glass reaction kettle 1, a heat source medium inlet 62 is arranged at the top of one side of the hollow interlayer 61, a heat source medium outlet 63 is arranged at the bottom of the hollow interlayer 61, and the heating component is connected with an external heat source medium pipeline through the heat source medium inlet 62 and the heat source medium outlet 63 as shown in fig. 2, so that the temperature of reactants in the glass reaction kettle 1 is controlled, and the optimal reaction environment can be provided according to the actual conditions of the reactants.
The working principle is that firstly, a worker adds reactants into the glass reaction kettle 1 through the feed inlet 4, then drives the stirring assembly 11 to rotate in the opposite direction to the scraping plate assembly 12 through the driving assembly 8, so that the flow direction of the reactants in the glass reaction kettle 1 can be disturbed, the reactants are mixed more fully, during the period, the stirring assembly 11 is matched with the heating assembly 6 to stir the reactants in the glass reaction kettle 1, on the one hand, the reactants in all positions in the glass reaction kettle 1 are heated uniformly, the quality of a final product is improved, and then the reactants adhered to the inner wall of the glass reaction kettle 1 can be scraped through the scraping plate assembly 12, so that the reactants are participated in the stirring process again, and the mixing effect of the reactants is further improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The stirring structure comprises a glass reaction kettle (1), and is characterized by further comprising a sealing top cover (2) matched with the glass reaction kettle (1), a supporting machine table (7) is coaxially arranged at the top of the sealing top cover (2), a second transmission shaft (9) is rotatably connected to the bottom of an inner cavity of the supporting machine table (7), and the second transmission shaft (9) is of a hollow design and further comprises:
The stirring assembly (11) is arranged outside the second transmission shaft (9) and can fully mix reactants in the glass reaction kettle (1) after preheating, a third transmission shaft (10) is rotatably connected in the second transmission shaft (9), a scraping plate assembly (12) for preventing the reactants from adhering to the inner wall of the glass reaction kettle (1) is arranged at the bottom end of the third transmission shaft (10), and a driving assembly (8) capable of enabling the stirring assembly (11) and the scraping plate assembly (12) to reversely rotate is arranged at the top end of the second transmission shaft (9);
The device is characterized in that the device is arranged at the edge of the bottom of the sealing top cover (2) and is convenient to assemble and disassemble the assembly (3) in butt joint with the glass reaction kettle (1), a heating assembly (6) for improving the temperature of reactants is arranged outside the glass reaction kettle (1), a feed inlet (4) is formed in the top of one side of the sealing top cover (2), a discharge opening (5) is formed in the bottom of an inner cavity of the glass reaction kettle (1), and an electromagnetic valve is arranged in the discharge opening (5).
2. The stirring structure of claim 1, wherein the stirring assembly (11) comprises a first stirring paddle board (111) arranged in the glass reaction kettle (1), the first stirring paddle board (111) is provided with at least two stirring paddle boards, one end of the first stirring paddle board (111) is connected with the second transmission shaft (9), an electric heating wire (112) is fixedly arranged in the first stirring paddle board (111), an electric slip ring (113) is arranged at the bottom of an inner cavity of the supporting machine (7), a stator of the electric slip ring (113) is connected with the bottom surface of the supporting machine (7) through bolts, a rotor of the electric slip ring (113) is connected with the second transmission shaft (9), the electric heating wire (112) is connected with the output end of the electric slip ring (113) through a wire, a temperature controller (114) is fixedly arranged on one side of the supporting machine (7), and the temperature controller (114) is connected with the input end of the electric slip ring (113) through a wire.
3. The stirring structure of claim 1, wherein the scraper assembly (12) comprises a first reinforcing sleeve (121) arranged below the second transmission shaft (9), the first reinforcing sleeve (121) is fixedly arranged on the outer side of the third transmission shaft (10), L-shaped rods (122) are fixedly connected to two sides of the first reinforcing sleeve (121), a plurality of second stirring paddles (124) are symmetrically arranged on one side, facing the second transmission shaft (9), of the L-shaped rods (122), scraping strips (123) are fixedly connected to the other side of the L-shaped rods (122), and the outer sides of the scraping strips (123) are in contact with the inner wall of the glass reaction kettle (1).
4. The stirring structure of claim 3, wherein a fixing seat (14) is fixedly connected to the outer side of the second transmission shaft (9), a second reinforcing sleeve (15) is rotatably connected to the outer side of the fixing seat (14), a connecting rod (13) is vertically arranged at the top end of the L-shaped rod (122), and one end of the connecting rod (13) is connected with the second reinforcing sleeve (15).
5. The stirring structure of claim 1, wherein the driving assembly (8) comprises a motor (81) fixed at the top of the supporting machine (7), the top end of the second transmission shaft (9) penetrates through the supporting machine (7) to be connected with the output end of the motor (81), a driving bevel gear (83) is fixedly connected to the outer side of the second transmission shaft (9), a driven bevel gear (84) is fixedly connected to the outer side of the third transmission shaft (10), a transmission bevel gear (85) is arranged between the driven bevel gear (84) and the driving bevel gear (83), a first transmission shaft (82) is fixedly connected to one side of the transmission bevel gear (85), one end of the first transmission shaft (82) is in rotary connection with the supporting machine (7), and the transmission bevel gear (85) is meshed with the driving bevel gear (83) and the driven bevel gear (84) respectively.
6. The stirring structure of claim 1, wherein the dismounting assembly (3) comprises a first butt joint flange (31) fixed at the bottom of the sealing top cover (2), a second butt joint flange (34) is fixedly connected to the top of the glass reaction kettle (1), mounting grooves (33) are formed in the top of the second butt joint flange (34) and the bottom of the first butt joint flange (31), sealing gaskets (32) are arranged in the mounting grooves (33), and the first butt joint flange (31) and the second butt joint flange (34) are connected through bolts.
7. The stirring structure of claim 1, wherein the heating component (6) comprises a hollow interlayer (61) arranged on the outer side of the glass reaction kettle (1), a heat source medium inlet (62) is formed in the top of one side of the hollow interlayer (61), and a heat source medium outlet (63) is formed in the bottom of the hollow interlayer (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422833162.5U CN223381444U (en) | 2024-11-20 | 2024-11-20 | Stirring structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422833162.5U CN223381444U (en) | 2024-11-20 | 2024-11-20 | Stirring structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223381444U true CN223381444U (en) | 2025-09-26 |
Family
ID=97131368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422833162.5U Active CN223381444U (en) | 2024-11-20 | 2024-11-20 | Stirring structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223381444U (en) |
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2024
- 2024-11-20 CN CN202422833162.5U patent/CN223381444U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 221000 Jiangsu Province Xuzhou City Xuzhou Economic and Technological Development Zone Liu Jing Road No. 1 Patentee after: Xuzhou Haotong New Material Technology Group Co., Ltd. Country or region after: China Address before: 221000 Jiangsu Province Xuzhou City Xuzhou Economic and Technological Development Zone Liu Jing Road No. 1 Patentee before: XUZHOU HOOTECH NEW MATERIALS SCIENCE & TECHNOLOGY Co.,Ltd. Country or region before: China |