CN109201174B - Coal crushing detection method, coal crushing adjustment method and coal crusher - Google Patents
Coal crushing detection method, coal crushing adjustment method and coal crusher Download PDFInfo
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- CN109201174B CN109201174B CN201811077789.5A CN201811077789A CN109201174B CN 109201174 B CN109201174 B CN 109201174B CN 201811077789 A CN201811077789 A CN 201811077789A CN 109201174 B CN109201174 B CN 109201174B
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- 239000003245 coal Substances 0.000 title claims abstract description 84
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 68
- 238000010298 pulverizing process Methods 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 description 15
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention provides a coal crushing detection method, an adjusting method and a coal crusher, wherein the detection method comprises the following steps of S100: generating an air flow passing over the winch from top to bottom or from bottom to top and circulating said air flow through the cylinder in which the winch is located; step S200: acquiring a gas flow rate value of the gas flow at any position of a path along which the gas flow circulates; and step S300: and determining whether the coal is uniformly crushed according to the comparison result of the gas flow velocity value and a preset value segment, and determining that the coal is uniformly crushed when the gas flow velocity value is larger than the lower limit value of the preset value segment and smaller than the upper limit value of the preset value segment, otherwise determining that the coal is not uniformly or excessively uniformly crushed.
Description
Technical Field
The invention relates to the technical field of coal mine mechanical equipment, in particular to a coal crushing detection method, an adjusting method and a coal crusher.
Background
A pulverizer is a machine that pulverizes a large-sized solid raw material to a desired size. The crusher consists of crushing, fine crushing, wind conveying and other devices, and the purpose of the crusher is achieved in a high-speed impact mode. The coal pulverizer is used for pulverizing coal, for example, patent application with publication number CN108393135A discloses a coal pulverizer, which comprises a barrel, a feeding port, a discharging port, a first pulverizing mechanism, a second pulverizing mechanism and a lifting mechanism, wherein the first pulverizing mechanism is fixedly arranged at the upper part in the barrel, the second pulverizing mechanism is arranged at the lower part in the barrel through the lifting mechanism, the feeding port is arranged at the upper end of the barrel, and the discharging port is arranged at the lower end of the barrel. In fact, whether the coal is crushed uniformly affects the coal quality. However, the coal pulverizer disclosed in the above patent application can only pulverize coals with different particle sizes, but cannot directly judge whether the coals are pulverized uniformly, and needs to depend on the experience of workers.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coal crushing detection method, an adjusting method and a coal crusher, so that coal is crushed uniformly.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal pulverizing detection method comprises
Step S100: generating an air flow passing over the winch from top to bottom or from bottom to top and circulating said air flow through the cylinder in which the winch is located;
step S200: acquiring a gas flow rate value of the gas flow at any position of a path along which the gas flow circulates;
step S300: and determining whether the coal is uniformly crushed according to the comparison result of the gas flow velocity value and a preset value segment, and determining that the coal is uniformly crushed when the gas flow velocity value is larger than the lower limit value of the preset value segment and smaller than the upper limit value of the preset value segment, otherwise determining that the coal is not uniformly or excessively uniformly crushed.
As an implementation manner, in the step S100, an air flow passing through the winch from top to bottom is generated, and the air flow is made to form an air flow circulation passing through the cylinder where the winch is located.
Correspondingly, the invention also provides the following technical scheme:
the coal crushing adjusting method comprises the detection method and the detection method
Step S400: and regulating the rotation speed of the winch according to the comparison result of the gas flow rate value and the preset value section, controlling the winch to decelerate when the gas flow rate value is smaller than the upper limit value of the preset value section, and controlling the winch to brake when the gas flow rate value is smaller than the lower limit value of the preset value section.
As an implementation manner, in the step S400, the turning direction of the winch is further adjusted according to the comparison result of the gas flow rate value and the preset value segment, and the winch is controlled to be periodically reversed when the gas flow rate value is smaller than the upper limit value of the preset value segment.
As an implementation manner, in the step S400, the rotation speed value of the winch and the gas flow rate value are inversely related.
Correspondingly, the invention also provides the following technical scheme:
a coal pulverizer comprises a barrel, a first transmission winch and a second transmission winch, wherein the first transmission winch and the second transmission winch are arranged in the barrel;
the air inlet flange pipe is arranged on the cylinder body, and the air outlet flange pipe is arranged on the air inlet flange pipe; the air hood, the pipeline fan, the gas flowmeter, the gas outlet flange pipe, the gas inlet flange pipe and the cylinder are sequentially connected to form a gas path for gas circulation passing through the first transmission winch and the second transmission winch;
the gas flow rate control device further comprises a driving device in transmission connection with the first transmission winch and the second transmission winch, the driving device is further connected with the gas flow meter, the driving device adjusts the rotating speeds of the first transmission winch and the second transmission winch according to the comparison result of the gas flow rate value and a preset value section, the first transmission winch and the second transmission winch are controlled to reduce the speed when the gas flow rate value is smaller than the upper limit value of the preset value section, and the first transmission winch and the second transmission winch are controlled to brake when the gas flow rate value is smaller than the lower limit value of the preset value section.
As an embodiment, the driving device further adjusts the turning direction of the first transmission winch and the second transmission winch according to the comparison result of the gas flow rate value and the preset value section, and controls the first transmission winch and the second transmission winch to reverse in a stepwise manner when the gas flow rate value is smaller than an upper limit value of the preset value section.
As an embodiment, the rotation speed values of the first transmission winch and the second transmission winch are inversely related to the gas flow rate value.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a coal crushing detection method, an adjusting method and a coal crusher, which can uniformly crush coal. By generating a gas flow through the winch from top to bottom or from bottom to top and taking the corresponding gas flow rate values, it is determined whether the coal is pulverized uniformly, i.e. the size of the gaps between the individual coal particles. And therefore no human judgment is required.
Drawings
FIG. 1 is a cross-sectional view of a coal pulverizer provided by an embodiment of the present invention;
FIG. 2 is a front view of a coal pulverizer provided by an embodiment of the present invention;
FIG. 3 is a perspective view of a coal pulverizer provided by an embodiment of the present invention;
FIG. 4 is a perspective view of a cartridge provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a coal pulverization detection method according to an embodiment of the present invention;
fig. 6 is a flowchart of a coal pulverization adjustment method according to an embodiment of the present invention.
In the figure: 1. a barrel; 101. a side seat; 102. a side plate; 2. a first drive capstan; 201. a first gear; 202. a long axis; 203. a first capstan; 3. a second drive capstan; 301. a second gear; 302. a minor axis; 303. a second capstan; 4. a fan housing; 5. a pipeline fan; 6. a gas flow meter; 7. an air outlet flange pipe; 8. an air inlet flange pipe; 9. a drive device; 901. a speed-regulating motor; 902. a speed reducer; 10. a first bracket; 11. a second support.
Detailed Description
The above and further features and advantages of the present invention will be apparent from the following, complete description of the invention, taken in conjunction with the accompanying drawings, wherein the described embodiments are merely some, but not all embodiments of the invention.
In one embodiment, as shown in fig. 1 and 2. The coal pulverizer provided by the embodiment comprises a cylinder body 1, a first transmission winch 2 and a second transmission winch 3 which are arranged in the cylinder body 1, and a fan cover 4 which is arranged in the cylinder body 1 and is positioned below the first transmission winch 2 and the second transmission winch 3; the fan cover 4 is funnel-shaped; the air-conditioning system also comprises a pipeline fan 5, a gas flowmeter 6, an air outlet flange pipe 7 and an air inlet flange pipe 8, wherein the pipeline fan 5, the gas flowmeter 6 and the air outlet flange pipe 7 are sequentially arranged on the fan cover 4; the air outlet flange pipe 7 is used for connecting the air inlet flange pipe 8, so that the pipeline fan 5, the gas flowmeter 6, the air outlet flange pipe 7, the air inlet flange pipe 8, the cylinder 1 and the fan cover 4 form a circulating air path; the gas flow meter is characterized by further comprising a driving device 9 in transmission connection with the first transmission winch 2 and the second transmission winch 3, wherein the driving device 9 is also connected with the gas flow meter 6, and the rotating speeds of the first transmission winch 2 and the second transmission winch 3 are adjusted according to the gas flow rate measured by the gas flow meter 6.
In the present embodiment, an air flow passing through the first driving winch 2 and the second driving winch 3 from top to bottom is generated by the duct fan 5, and a gas flow rate value of the air flow is acquired by the gas flow meter 6. The coal particles are large at the initial stage of crushing, and the obtained gas flow velocity value is large; and at the last stage of crushing, the coal particles are small, and the obtained gas flow rate value is small. In fact, if the coal particles are too large, the pulverization is not uniform, and if the coal particles are too small, the pulverization is too uniform, both are not good. Therefore, the present embodiment determines whether coal is pulverized uniformly by detecting the gas flow rate value. And the rotating speeds of the first transmission winch 2 and the second transmission winch 3 are adjusted according to the comparison result of the gas flow rate value and the preset value section, specifically, when the gas flow rate value is smaller than the upper limit value of the preset value section, the first transmission winch 2 and the second transmission winch 3 are controlled to be decelerated, and when the gas flow rate value is smaller than the lower limit value of the preset value section, the first transmission winch 2 and the second transmission winch 3 are controlled to be braked. Thereby allowing the coal pulverizer to operate for a reasonable amount of time.
In one embodiment, the values of the rotational speeds of the first and second drive winches 2 and 3 are inversely related to the value of the gas flow rate measured by the gas flow meter 6. In the embodiment, when the gas flow rate value measured by the gas flow meter 6 is larger, the rotating speed values of the first transmission winch 2 and the second transmission winch 3 are smaller, so that the coal particles can be controlled conveniently.
In one embodiment, as shown in fig. 1 and 2. The coal pulverizer provided by the embodiment further comprises a first bracket 10 and a second bracket 11; the first bracket 10 and the second bracket 11 are arranged side by side; the first support 10 is used for installing the cylinder 1, the first transmission winch 2, the second transmission winch 3, the fan cover 4, the pipeline fan 5, the gas flowmeter 6, the gas outlet flange pipe 7 and the gas inlet flange pipe 8; the second bracket 11 provides mounting for the drive means 9. In this embodiment, the split bracket structure, i.e., the first bracket 10 and the second bracket 11, can facilitate the assembly of the coal pulverizer.
In one embodiment, as shown in FIG. 3. The driving device 9 provided in this embodiment includes a speed-regulating motor 901 and a speed reducer 902; the speed regulating motor 901 is in transmission connection with the speed reducer 902 through a belt pulley; the speed regulating motor 901 is also connected with a gas flow meter 6, and the speed reducer 902 is also connected with a first transmission winch 2 and a second transmission winch 3; the governor motor 901 adjusts the rotational speed of the speed reducer 902 according to the gas flow rate measured by the gas flow meter 6 to thereby adjust the rotational speeds of the first transmission winch 2 and the second transmission winch 3.
In one embodiment, as shown in FIG. 4. The first transmission winch 2 comprises a first gear 201, a long shaft 202 and a first winch 203; the long shaft 202 penetrates through the barrel body 1, the first gear 201 is sleeved on the long shaft 202 and is positioned on the outer side of the barrel body 1, and the first winch 203 is sleeved on the long shaft 202 and is positioned on the inner side of the barrel body 1; the second transmission winch 3 comprises a second gear 301, a stub shaft 302, and a second winch 303; a short shaft 302 penetrates through the barrel body 1, a second gear 301 is sleeved on the short shaft 302 and located on the outer side of the barrel body 1, and a second winch 303 is sleeved on the short shaft 302 and located on the inner side of the barrel body 1; the first gear 201 and the second gear 301 are engaged, and the long shaft 202 is connected with the driving device 9. In this embodiment, the long shaft 202 is driven by the speed reducer 902 to rotate the first gear 201 and the first capstan 203 thereon, and the second gear 301 rotates under the engagement of the first gear 201 to rotate the short shaft 302 and the second capstan 303 thereon. It is the first capstan 203 and the second capstan 303 that rotate in opposite directions that pulverize the coal particles. Furthermore, controlling the coal particle size requires controlling not only the distance between the major axis 202 and the minor axis 302, but also the rotational speeds of the first capstan 203 and the second capstan 303.
In one embodiment, as shown in FIG. 4. The cylinder 1 comprises a side seat 101 and a side plate 102; the lateral seat 101 provides a major axis 202 and a minor axis 302 therethrough; the side plates 102 are provided on both sides of the side base 101.
Based on the coal pulverizer provided in the above embodiment, a detection method of coal pulverization and an adjustment method of coal pulverization can be obtained, which are described below one by one.
In one embodiment, as shown in FIG. 5. The method for detecting coal pulverization according to the present embodiment includes step S100, step S200, and step S300. In step S100, an air flow passing through the capstan from top to bottom or from bottom to top is generated, and the air flow is circulated to form an air flow passing through the cylinder in which the capstan is located. In step S200, a gas flow rate value of the gas flow at an arbitrary position on the path of the gas flow circulation is acquired. In step S300, it is determined whether coal is pulverized uniformly according to a comparison result between the gas flow rate value and the preset value segment, and it is determined that coal is pulverized uniformly when the gas flow rate value is greater than a lower limit value of the preset value segment and less than an upper limit value of the preset value segment, otherwise it is determined that coal is pulverized non-uniformly or excessively uniformly. Because coal particles are large at the initial stage of crushing, the obtained gas flow velocity value is large; and at the last stage of crushing, the coal particles are small, and the obtained gas flow rate value is small. In fact, if the gas flow velocity value is larger than the lower limit value of the preset value segment and smaller than the upper limit value of the preset value segment, the coal particles are proper in size, and the coal is uniformly crushed. If the coal particles are bigger, the uniform crushing is indicated, and if the coal particles are smaller, the uniform crushing is indicated.
In one embodiment, as shown in FIG. 6. The method for adjusting coal pulverization provided in this embodiment includes step S100, step S200, step S300, and step S400; in step S100, an air flow passing through the capstan from top to bottom or from bottom to top is generated, and the air flow is circulated to form an air flow passing through the cylinder in which the capstan is located. In step S200, a gas flow rate value of the gas flow at an arbitrary position on the path of the gas flow circulation is acquired. In step S300, it is determined whether coal is pulverized uniformly according to a comparison result between the gas flow rate value and the preset value segment, and it is determined that coal is pulverized uniformly when the gas flow rate value is greater than a lower limit value of the preset value segment and less than an upper limit value of the preset value segment, otherwise it is determined that coal is pulverized non-uniformly or excessively uniformly. In step S400, the rotation speed of the winch is adjusted according to the comparison result between the gas flow rate value and the preset value segment, and the winch is controlled to decelerate when the gas flow rate value is smaller than the upper limit value of the preset value segment, and the winch is controlled to brake when the gas flow rate value is smaller than the lower limit value of the preset value segment. In the present embodiment, the first driving winch 2 and the second driving winch 3 are controlled to be decelerated when the gas flow rate value is smaller than the upper limit value of the preset value section, and the first driving winch 2 and the second driving winch 3 are controlled to be braked when the gas flow rate value is smaller than the lower limit value of the preset value section, thereby making the coal particle size suitable.
In one embodiment, the coal pulverizing adjusting method further adjusts the turning direction of the winch according to the comparison result of the gas flow rate value and the preset value section, and controls the winch to reverse periodically when the gas flow rate value is smaller than the upper limit value of the preset value section. In this embodiment, whether coal is pulverized uniformly can be verified by switching between forward rotation and reverse rotation. In the normal rotation, the first transmission winch 2 and the second transmission winch 3 crush the coal. In the reverse rotation, the coal cannot be pulverized but can be turned because of the self-construction of the first and second driving winches 2 and 3. If the coal is fully stirred, the gas flow velocity value is small and cannot be changed after the coal is turned over; otherwise, the gas flow rate value is small and changes.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (6)
1. A coal pulverization detection method is characterized by comprising
Step S100: generating an air flow passing over the winch from top to bottom or from bottom to top and circulating said air flow through the cylinder in which the winch is located;
step S200: acquiring a gas flow rate value of the gas flow at any position of a path along which the gas flow circulates;
step S300: and determining whether the coal is uniformly crushed according to the comparison result of the gas flow velocity value and a preset value segment, and determining that the coal is uniformly crushed when the gas flow velocity value is larger than the lower limit value of the preset value segment and smaller than the upper limit value of the preset value segment, otherwise determining that the coal is not uniformly or excessively uniformly crushed.
2. The coal pulverization detection method according to claim 1, wherein in step S100, an air flow passing through a winch from top to bottom is generated, and the air flow is circulated through a cylinder in which the winch is located.
3. A method of regulating coal pulverisation, characterised in that it comprises a detection method according to claim 1 or 2, and also comprises
Step S400: and regulating the rotation speed of the winch according to the comparison result of the gas flow rate value and the preset value section, controlling the winch to decelerate when the gas flow rate value is smaller than the upper limit value of the preset value section, and controlling the winch to brake when the gas flow rate value is smaller than the lower limit value of the preset value section.
4. The method of adjusting coal pulverization as claimed in claim 3, wherein in said step S400, turning of said capstan is also adjusted in accordance with a result of comparison of said gas flow rate value with said preset value section, and said capstan is controlled to be turned in stepwise reverse when said gas flow rate value is smaller than an upper limit value of said preset value section.
5. A coal pulverizer is characterized by comprising a cylinder body (1), a first transmission winch (2) and a second transmission winch (3) which are arranged in the cylinder body (1);
the device is characterized by further comprising a fan cover (4) which is arranged in the cylinder body (1) and is positioned below the first transmission winch (2) and the second transmission winch (3), a pipeline fan (5), a gas flowmeter (6) and an air outlet flange pipe (7) which are sequentially arranged on the fan cover (4), and an air inlet flange pipe (8) which is arranged on the cylinder body (1); the air hood (4), the pipeline fan (5), the gas flowmeter (6), the gas outlet flange pipe (7), the gas inlet flange pipe (8) and the cylinder (1) are sequentially connected to form a gas path of gas flow circulation passing through the first transmission winch (2) and the second transmission winch (3);
the gas flow rate control device is characterized by further comprising a driving device (9) in transmission connection with the first transmission winch (2) and the second transmission winch (3), the driving device (9) is further connected with the gas flow meter (6), the driving device (9) adjusts the rotating speed of the first transmission winch (2) and the second transmission winch (3) according to the comparison result of the gas flow rate value and a preset value section, the first transmission winch (2) and the second transmission winch (3) are controlled to reduce the speed when the gas flow rate value is smaller than the upper limit value of the preset value section, and the first transmission winch (2) and the second transmission winch (3) are controlled to brake when the gas flow rate value is smaller than the lower limit value of the preset value section.
6. Coal pulverizer according to claim 5, characterized in that said driving means (9) also adjusts the steering of said first transmission winch (2) and said second transmission winch (3) according to the result of the comparison between said gas flow rate value and said preset value segment, and controls said first transmission winch (2) and said second transmission winch (3) to reverse in stages when said gas flow rate value is less than the upper limit value of said preset value segment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811077789.5A CN109201174B (en) | 2018-09-16 | 2018-09-16 | Coal crushing detection method, coal crushing adjustment method and coal crusher |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811077789.5A CN109201174B (en) | 2018-09-16 | 2018-09-16 | Coal crushing detection method, coal crushing adjustment method and coal crusher |
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| CN109201174A CN109201174A (en) | 2019-01-15 |
| CN109201174B true CN109201174B (en) | 2020-11-20 |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1138303B (en) * | 1961-03-23 | 1962-10-18 | Eisengiesserei A Beien | Coal crusher for mining operations |
| GB1164359A (en) * | 1966-11-29 | 1969-09-17 | Fuller Co | Surface Area Measurement of Standard Length Sample of Finely Divided Solids. |
| JP2579885B2 (en) * | 1993-10-15 | 1997-02-12 | 川崎重工業株式会社 | Pulverizing method, pulverizing device and classifier for powder material |
| DE4339834A1 (en) * | 1993-11-23 | 1995-05-24 | Rheinische Werkzeug & Maschf | Method and device for grain size analysis in the fine and fine grain range |
| CN102553670A (en) * | 2012-01-20 | 2012-07-11 | 辽宁冶金焦化工程技术有限公司 | Double-tooth roller red coke crusher |
| CN102600950B (en) * | 2012-03-28 | 2014-05-07 | 泸州百草堂中药饮片有限公司 | Traditional Chinese medicinal material grinding process |
| CN204051782U (en) * | 2014-09-01 | 2014-12-31 | 华电电力科学研究院 | A kind of can the simultaneously broken and hammer mill of dry coal sample |
| CN204396119U (en) * | 2014-12-19 | 2015-06-17 | 宁波市镇海高途日用品有限公司 | A kind of airflow milling device |
| CN204536174U (en) * | 2015-03-13 | 2015-08-05 | 西安科技大学 | Fragmented rock body compacting and seepage characteristic experimental apparatus for research |
| CN105424905B (en) * | 2015-12-18 | 2017-05-03 | 河南理工大学 | Gas abnormity desorption characteristic test device and method in coal body destruction process |
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Effective date of registration: 20201027 Address after: Room 501, unit 2, building 27, Jujiang Road, chuocheng street, Yiwu City, Jinhua City, Zhejiang Province Applicant after: Yiwu Tiancheng Technology Co.,Ltd. Address before: 031400, No. 168 East Main Street, Linfen, Shanxi, Huozhou Applicant before: Wen Liying |
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Effective date of registration: 20231018 Address after: 465200 Xinhe Group, Sungang Village, Jiangji Town, Gushi County, Xinyang City, Henan Province Patentee after: Rao Longqiang Address before: 322000 Room 501, unit 2, building 27, Houjiang Road, Houcheng street, Yiwu City, Jinhua City, Zhejiang Province Patentee before: Yiwu Tiancheng Technology Co.,Ltd. |