CN219129419U - Double-layer crushing device and superfine crushing impact mill capable of realizing coarse and fine two-stage crushing - Google Patents
Double-layer crushing device and superfine crushing impact mill capable of realizing coarse and fine two-stage crushing Download PDFInfo
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- CN219129419U CN219129419U CN202320190502.XU CN202320190502U CN219129419U CN 219129419 U CN219129419 U CN 219129419U CN 202320190502 U CN202320190502 U CN 202320190502U CN 219129419 U CN219129419 U CN 219129419U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The utility model discloses a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing, comprising a coarse crushing millstone and a fine crushing millstone; the coarse grinding millstone and the fine grinding millstone are coaxially sleeved on the shafting part in sequence from top to bottom; the coarse crushing millstone is provided with a coarse crushing hammer head, and the fine grinding millstone is provided with a fine grinding hammer head; a coarse crushing gear ring is coaxially arranged outside the coarse crushing millstone, and a fine grinding gear ring is coaxially arranged outside the fine grinding millstone; the coarse grinding hammer head and the coarse grinding gear ring are used for coarse grinding, and the fine grinding hammer head and the fine grinding gear ring are used for fine grinding; and a gap is reserved between the coarse crushing gear ring and the coarse crushing millstone. By adopting the scheme, the material is crushed by the coarse crushing millstone firstly through the special double-layer crushing device, and falls to the fine grinding millstone for secondary crushing after reaching a certain fineness, so that the required fineness is achieved, the crushing efficiency is higher, and the yield is higher.
Description
Technical Field
The utility model relates to the technical field of powder preparation, in particular to a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing.
Background
The impact mill is a high-efficiency modern fine mill device, is a key device widely used in the corn, potato and starch industries, and is an ideal device for replacing diamond sanding or conical small steel mill still adopted by a plurality of domestic factories.
However, the existing superfine grinding impact mill has the defects that the grinding disc grinding device is a single-layer disc, materials are directly fed to the single-layer grinding disc, the impact times of the materials and hammer heads are small, the grinding efficiency of equipment is low, and the unit energy consumption is increased.
Disclosure of Invention
The utility model aims to solve the defects of the prior art and provides a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing.
The utility model is realized by the following technical scheme:
a double-layer crushing device, which comprises a coarse crushing millstone and a fine crushing millstone;
the coarse grinding millstone and the fine grinding millstone are coaxially sleeved on the shafting part in sequence from top to bottom;
the coarse crushing millstone is provided with a coarse crushing hammer head, and the fine grinding millstone is provided with a fine grinding hammer head; a coarse crushing gear ring is coaxially arranged outside the coarse crushing millstone, and a fine grinding gear ring is coaxially arranged outside the fine grinding millstone;
the coarse grinding hammer head and the coarse grinding gear ring are used for coarse grinding, and the fine grinding hammer head and the fine grinding gear ring are used for fine grinding; and a gap is reserved between the coarse crushing gear ring and the coarse crushing millstone.
Compared with the prior art, the superfine grinding impact mill has the advantages that the grinding disc grinding device is a single-layer disc, materials are directly fed to the single-layer grinding disc, the impact times of the materials and hammer heads are small, the grinding efficiency of equipment is low, and the unit energy consumption is increased. The coarse grinding millstone and the fine grinding millstone synchronously rotate, and compared with the coarse grinding millstone, the fine grinding millstone has larger diameter and higher linear speed; the rough grinding gear ring is coaxially and fixedly arranged outside the rough grinding millstone, the fine grinding gear ring is coaxially and fixedly arranged outside the fine grinding millstone, wherein the rough grinding hammer head, the rough grinding millstone, the rough grinding gear ring, the fine grinding hammer head and the fine grinding millstone are all made of high-hardness wear-resistant materials, the fine grinding gear ring is made of common materials, the inner side surface of the fine grinding gear ring is provided with a tooth surface with a specific angle, the inner side surface of the fine grinding gear ring is provided with wear-resistant alloy sheets, and the wear-resistant alloy sheets are made of high-hardness wear-resistant materials; in the actual operation process, the materials fall on the coarse crushing millstone from the upper part, the coarse crushing millstone rotates and is thrown between the coarse crushing hammer head and the coarse crushing gear ring under the action of centrifugal force, and shearing force is generated between the coarse crushing hammer head and the coarse crushing gear ring in the high-speed rotation process, so that coarse crushing is performed; when the material reaches a certain fineness, the material falls on the fine grinding disc through a gap between the coarse grinding disc and the coarse grinding gear ring, and is thrown between the fine grinding hammer head and the fine grinding gear ring under the action of centrifugal force, so that shearing force is generated between the fine grinding hammer head and the fine grinding gear ring, and secondary grinding is performed to reach the required fineness.
Further preferably, the diameter of the fine grinding disc is larger than the diameter of the coarse grinding disc; for increasing the refining efficiency.
Further preferably, the coarse grinding millstone and the coarse grinding hammer head and the fine grinding millstone and the fine grinding hammer head are connected through a plurality of bolts; for effecting a detachable connection.
Further optimizing, the superfine grinding impact mill capable of realizing coarse and fine two-stage grinding comprises a shell, wherein the double-layer grinding device is positioned in the shell; an upper plate and a lower plate are sequentially arranged in the shell from top to bottom, and the coarse crushing gear ring and the fine crushing gear ring are both fixed between the upper plate and the lower plate; is used for fixing the double-layer crushing device.
Further optimized, the device also comprises a bracket, wherein the shell is arranged on the bracket, and a driving motor is further arranged on the bracket and is in transmission connection with the shafting part through a transmission system; for driving and adjusting the rotational speed of the coarse grinding disc and the fine grinding disc.
Further preferably, the shell comprises an upper shell and a lower shell, and the lower end of the upper shell is detachably connected with the upper end of the lower shell through the upper plate; a raw material inlet channel is arranged in the upper shell and is communicated with the upper end of the coarse crushing millstone through an upper plate; is convenient to disassemble and assemble.
Further optimized, the raw material inlet channel is an internal channel of an air-isolation cone hopper, and the lower end of the air-isolation cone hopper is connected with the upper plate in a sealing way; for separating the inner and outer channels.
Further optimizing, an air inlet channel is arranged on the side wall of the lower shell below the lower plate, a gas channel is arranged in the double-layer crushing device, a material gas ascending channel is arranged on the outer side of the gas separation cone hopper, and the air inlet channel, the gas channel and the material gas ascending channel are sequentially communicated; the upper end of the material gas ascending channel at the outer side of the gas separation cone hopper is provided with a material gas outlet; for collecting the crushed material.
Further preferably, a sorting system is arranged above the upper shell, and the sorting system is communicated with the material gas ascending channel through a material gas outlet; screening is carried out through a sorting system, and qualified particle size materials are collected intensively through an air outlet above the sorting system.
Further preferably, the upper end of the coarse crushing gear ring is provided with a flange, and the flange is connected with the upper plate through a plurality of bolts; the outer side surface of the fine grinding gear ring is connected with the side wall of the lower shell through a plurality of bolts; for effecting a detachable connection.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
1. the utility model provides a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing.
2. The utility model provides a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing. The utility model has the advantages of higher crushing efficiency, higher yield, longer service life of vulnerable parts, simple structure, convenient disassembly and assembly and simple operation.
3. The utility model provides a double-layer crushing device and an ultrafine crushing impact mill capable of realizing coarse and fine two-stage crushing.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model. In the drawings:
FIG. 1 is a schematic diagram of a structure provided by the present utility model;
fig. 2 is a schematic structural diagram of the air separation system according to the present utility model.
In the drawings, the reference numerals and corresponding part names:
the device comprises a 1-gas-isolation cone hopper, a 2-upper shell, a 3-connecting bolt, a 4-coarse crushing gear ring, a 5-coarse crushing hammer head, a 6-coarse crushing grinding disc, a 7-wear-resistant metal sheet, an 8-fine grinding gear ring, a 9-fine grinding hammer head, a 10-fine grinding disc, a 11-shafting part, a 12-lower shell, a 13-bracket, a 14-transmission system, a 15-driving motor, a 16-feeding device and a 17-sorting system.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
Example 1
The present embodiment 1 provides a double-layered crushing apparatus, as shown in fig. 1-2, comprising a coarse crushing disc 6 and a fine crushing disc 10;
the coarse grinding millstone 6 and the fine grinding millstone 10 are coaxially sleeved on the shafting part 11 sequentially from top to bottom;
the coarse crushing millstone 6 is provided with a coarse crushing hammer 5, and the fine grinding millstone 10 is provided with a fine grinding hammer 9; the coarse crushing gear ring 4 is coaxially arranged outside the coarse crushing millstone 6, and the fine grinding gear ring 8 is coaxially arranged outside the fine grinding millstone 10;
the coarse crushing hammer 5 and the coarse crushing gear ring 4 are used for coarse crushing, and the fine crushing hammer 9 and the fine crushing gear ring 8 are used for fine crushing; a gap is reserved between the coarse crushing gear ring 4 and the coarse crushing millstone 6.
Compared with the prior art, the superfine grinding impact mill has the advantages that the grinding disc grinding device is a single-layer disc, materials are directly fed to the single-layer grinding disc, the impact times of the materials and hammer heads are small, the grinding efficiency of equipment is low, and the unit energy consumption is increased; the coarse grinding millstone 6 and the fine grinding millstone 10 rotate synchronously, and the fine grinding millstone 10 has larger diameter and higher linear speed compared with the coarse grinding millstone 6; the rough grinding gear ring 4 is coaxially and fixedly arranged outside the rough grinding millstone 6, the fine grinding gear ring 8 is coaxially and fixedly arranged outside the fine grinding millstone 10, wherein the rough grinding hammer head 5, the rough grinding millstone 6, the rough grinding gear ring 4, the fine grinding hammer head 9 and the fine grinding millstone 10 are all made of high-hardness wear-resistant materials, the fine grinding gear ring 8 is made of common materials, the inner side surface is provided with a tooth surface with a specific angle, the inner side surface is provided with wear-resistant alloy sheets, and the wear-resistant alloy sheets are made of high-hardness wear-resistant materials; in the actual operation process, the materials fall on the coarse crushing millstone 6 from above, the coarse crushing millstone 6 rotates and is thrown between the coarse crushing hammer 5 and the coarse crushing gear ring 4 under the action of centrifugal force, and shearing force is generated between the coarse crushing hammer 5 and the coarse crushing gear ring 4 in the high-speed rotation process, so that coarse crushing is performed; when the material reaches a certain fineness, the material falls on the fine grinding disc 10 through a gap between the coarse grinding disc 6 and the coarse grinding gear ring 4, and is thrown between the fine grinding hammer 9 and the fine grinding gear ring 8 under the action of centrifugal force, and a shearing force is generated between the fine grinding hammer 9 and the fine grinding gear ring 8, so that secondary grinding is performed, and the required fineness is achieved.
In this embodiment, the diameter of the refining disc 10 is larger than the diameter of the coarse grinding disc 6; because the diameter of the fine grinding disc 10 is larger, the linear speed is faster, the formed shearing force is larger, and the material crushing fineness is finer, thereby increasing the fine grinding efficiency.
As a redundancy scheme of detachable connection, in the embodiment, the coarse grinding millstone 6 and the coarse grinding hammer head 5 and the fine grinding millstone 10 and the fine grinding hammer head 9 are connected through a plurality of bolts; a plurality of threaded holes are uniformly distributed on the circumferential surface of the rough grinding disc 6, a plurality of countersunk bolt holes are matched with the end surface of the rough grinding hammer head 5, and the two are detachably connected through a plurality of connecting bolts 3; the circumference of the fine grinding disc 10 is uniformly provided with a plurality of threaded holes, the end face of the fine grinding hammer 9 is matched with a countersunk bolt hole, and the two are detachably connected through a plurality of connecting bolts 3.
Example 2
This example 2 was further optimized on the basis of example 1, and provided an ultra-fine pulverizing impact mill capable of achieving two-stage coarse and fine pulverization.
Referring to fig. 1, as an embodiment of the fixed double-layer pulverizing apparatus, it is provided that: the double-layer crushing device is positioned in the shell; an upper plate and a lower plate are sequentially arranged in the shell from top to bottom, and the coarse crushing gear ring 4 and the fine grinding gear ring 8 are both fixed between the upper plate and the lower plate; in this embodiment, it will be appreciated that the upper and lower plates are fixed in the housing and are parallel to each other, and the shafting portion 11 is connected to the double-layered crushing apparatus through the lower plate, and the double-layered crushing apparatus is clamped inside by the upper and lower plates, so that the internal structure is compactly arranged.
As a redundant scheme of power driving, the device also comprises a bracket 13, wherein the shell is arranged on the bracket 13, the bracket 13 is also provided with a driving motor 15, and the driving motor 15 is in transmission connection with the shafting part 11 through a transmission system 14; the coarse grinding disc 6 and the fine grinding disc 10 are driven to rotate by the driving motor 15, and the rotation speeds of the fine grinding disc 10 and the coarse grinding disc 6 are adjusted by adjusting the frequency of the driving motor 15.
Referring to fig. 1, as a specific embodiment that is convenient for disassembly and assembly, it is set as follows: the shell comprises an upper shell 2 and a lower shell 12, wherein the lower end of the upper shell 2 is detachably connected with the upper end of the lower shell 12 through an upper plate; a raw material inlet channel is arranged in the upper shell 2 and is communicated with the upper end of the coarse grinding disc 6 through an upper plate; it can be understood that in this embodiment, the housing is divided into an upper housing 2 and a lower housing 12, wherein the upper plate is located at the lower end of the upper housing 2, and is connected with the upper end of the lower housing 12 through a bolt, so that the disassembly and assembly can be realized; the upper shell 2 is internally provided with a raw material inlet channel, the raw material inlet channel is connected with the feeding device 16 and is communicated with the coarse grinding disc 6 through the upper plate, and materials can enter the raw material inlet channel from the feeding device 16 and finally enter the coarse grinding disc 6.
As a specific embodiment of the airtight seal, it is provided that: the raw material inlet channel is an internal channel of the gas-barrier cone hopper 1, and the lower end of the gas-barrier cone hopper 1 is connected with the upper plate in a sealing way; in the embodiment, the materials can be intensively placed in the coarse crushing millstone 6 by arranging the air-isolation cone hopper 1 with a large upper part and a small lower part; in addition, the air separation cone hopper 1 is in sealing connection with the upper plate and is used for separating the inner channel from the outer channel, so that materials are prevented from directly entering the outer channel.
As an embodiment for collecting crushed material, there is provided: an air inlet channel is formed in the side wall of the lower shell 12 below the lower plate, a gas channel is arranged in the double-layer crushing device, a material gas rising channel is arranged outside the gas-isolation cone hopper 1, and the air inlet channel, the gas channel and the material gas rising channel are sequentially communicated; the upper end of the material gas ascending channel at the outer side of the gas separation cone hopper 1 is provided with a material gas outlet; it can be understood that in this embodiment, the fan is arranged outside the shell, and after a certain fineness is reached, the qualified material can be collected by the external device through the material gas rising channel and the material gas outlet under the negative pressure of the system fan under the negative pressure driving of the channel; the cone hopper with a specific angle can ensure that materials smoothly enter the crushing area and simultaneously has a smooth material gas ascending channel.
Referring to fig. 2, as a redundant scheme of screening, a sorting system 17 is arranged above the upper casing 2, and the sorting system 17 is communicated with a feed gas rising channel through a feed gas outlet; in this embodiment, the sorting system 17 is used for sorting, and qualified materials with particle sizes are collected intensively through an air outlet above the sorting system 17.
As a redundancy scheme of detachable connection, in the embodiment, the upper end of the coarse crushing gear ring 4 is provided with a flange, and the flange is connected with an upper plate through a plurality of bolts; a plurality of threaded holes are uniformly distributed on the circumferential surface of the upper end of the flange surface, and the flange surface is detachably connected to the upper plate through a plurality of connecting bolts 3.
As a redundancy scheme for the detachable connection, in this embodiment, the outer side surface of the finish grinding gear ring 8 and the side wall of the lower housing 12 are connected by a plurality of bolts; a plurality of threaded holes are uniformly distributed on the circumferential direction of the outer side surface of the fine grinding gear ring 8, and the fine grinding gear ring is detachably connected with the side wall of the lower shell 12 through a plurality of connecting bolts 3.
Working principle: the materials pass through the feeding device 16 at constant feeding rate and enter the channel through the raw materials, fall on the rough grinding disc 6, are thrown between the rough grinding hammer head 5 and the rough grinding gear ring 4 under the action of centrifugal force to carry out rough grinding, and fall on the fine grinding disc 10 through the gap between the rough grinding disc 6 and the rough grinding gear ring 4 after reaching a certain fineness, and are thrown between the fine grinding hammer head 9 and the fine grinding gear ring 8 under the action of centrifugal force to carry out secondary grinding. After reaching a certain fineness, under the action of negative pressure of a system fan, passing the qualified materials through a material gas ascending channel, sorting through a sorting system 17, collecting the qualified materials with particle sizes in a concentrated way through an air outlet above the sorting system 17, and entering a next procedure; thereby achieving the purpose of superfine grinding of the materials.
In the principle, the high-speed rotation is driven by the driving motor 15, the transmission system 14 and the shafting part 11, and a shearing force is formed between the coarse grinding gear ring 4 and the fine grinding gear ring 8, so that the purpose of material grinding is achieved. Because the material passes through the coarse crushing area before entering the fine grinding area, the diameter of the fine grinding millstone 10 is larger, the linear speed is faster, the formed shearing force is larger, the material crushing fineness is finer, the fine grinding efficiency is improved, the raw material entering channel and the material gas ascending channel are separated by the gas-isolation hopper, the gas paths are smooth and mutually noninterfere, the excessive crushing of the material is avoided, the stable running of the equipment is ensured, and the current of the driving motor 15 is stable.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. A double-layer crushing device, which is characterized by comprising a coarse crushing millstone (6) and a fine crushing millstone (10);
the coarse grinding millstone (6) and the fine grinding millstone (10) are coaxially sleeved on the shafting part (11) in sequence from top to bottom;
the coarse grinding millstone (6) is provided with a coarse grinding hammer head (5), and the fine grinding millstone (10) is provided with a fine grinding hammer head (9); a coarse crushing gear ring (4) is coaxially arranged outside the coarse crushing millstone (6), and a fine grinding gear ring (8) is coaxially arranged outside the fine grinding millstone (10);
the coarse grinding hammer head (5) and the coarse grinding gear ring (4) are used for coarse grinding, and the fine grinding hammer head (9) and the fine grinding gear ring (8) are used for fine grinding; a gap is reserved between the coarse crushing gear ring (4) and the coarse crushing millstone (6).
2. A double-deck grinding device according to claim 1, characterized in that the diameter of the fine grinding disc (10) is larger than the diameter of the coarse grinding disc (6).
3. A double-deck grinding device according to claim 1, characterized in that the coarse grinding disc (6) and the coarse grinding hammer (5) and the fine grinding disc (10) and the fine grinding hammer (9) are connected by means of bolts.
4. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding is characterized by comprising a shell, wherein the double-layer grinding device is positioned in the shell; an upper plate and a lower plate are sequentially arranged in the shell from top to bottom, and the double-layer crushing device is arranged between the upper plate and the lower plate; the double-layer pulverizing apparatus according to any one of claims 1 to 3.
5. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 4, further comprising a bracket (13), wherein the shell is arranged on the bracket (13), a driving motor (15) is further arranged on the bracket (13), and the driving motor (15) is in transmission connection with the shafting part (11) through a transmission system (14).
6. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 4, wherein the housing comprises an upper housing (2) and a lower housing (12), and the lower end of the upper housing (2) is detachably connected with the upper end of the lower housing (12) through an upper plate; the upper shell (2) is internally provided with a raw material inlet channel, and the raw material inlet channel is communicated with the upper end of the coarse crushing millstone (6) through an upper plate.
7. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 6, wherein the raw material inlet channel is an internal channel of an air-isolation cone hopper (1), and the lower end of the air-isolation cone hopper (1) is in sealing connection with the upper plate.
8. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 7, wherein an air inlet channel is arranged on the side wall of a lower shell (12) below the lower plate, a gas channel is arranged in the double-layer grinding device, a material gas rising channel is arranged outside the gas-isolation cone hopper (1), and the air inlet channel, the gas channel and the material gas rising channel are sequentially communicated; the upper end of the material gas ascending channel at the outer side of the gas separation cone hopper (1) is provided with a material gas outlet.
9. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 8, wherein a sorting system (17) is arranged above the upper shell (2), and the sorting system (17) is communicated with the material gas ascending channel through a material gas outlet.
10. The superfine grinding impact mill capable of realizing coarse and fine two-stage grinding according to claim 6, wherein the upper end of the coarse grinding gear ring (4) is provided with a flange, and the flange is connected with an upper plate through a plurality of bolts; the outer side surface of the fine grinding gear ring (8) is connected with the side wall of the lower shell (12) through a plurality of bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320190502.XU CN219129419U (en) | 2023-01-31 | 2023-01-31 | Double-layer crushing device and superfine crushing impact mill capable of realizing coarse and fine two-stage crushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320190502.XU CN219129419U (en) | 2023-01-31 | 2023-01-31 | Double-layer crushing device and superfine crushing impact mill capable of realizing coarse and fine two-stage crushing |
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| Publication Number | Publication Date |
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| CN219129419U true CN219129419U (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320190502.XU Active CN219129419U (en) | 2023-01-31 | 2023-01-31 | Double-layer crushing device and superfine crushing impact mill capable of realizing coarse and fine two-stage crushing |
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| CN (1) | CN219129419U (en) |
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Address after: No. 31, East Section of Dapeng Road, Gaoxin District, Jiangyou City, Mianyang City, Sichuan Province, 621000 Patentee after: Mianyang Jiufang Intelligent Equipment Technology Co.,Ltd. Country or region after: China Address before: No. 31, East Section of Dapeng Road, Gaoxin District, Jiangyou City, Mianyang City, Sichuan Province, 621000 Patentee before: MIANYANG ELITELEAGUE ENVIRONMENTAL PROTECTION AND ENERGY SAVING TECHNOLOGY CO.,LTD. Country or region before: China |