CN105223056A - A kind of swing type contracting device - Google Patents
A kind of swing type contracting device Download PDFInfo
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- CN105223056A CN105223056A CN201510695451.6A CN201510695451A CN105223056A CN 105223056 A CN105223056 A CN 105223056A CN 201510695451 A CN201510695451 A CN 201510695451A CN 105223056 A CN105223056 A CN 105223056A
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- diversion trench
- swinging block
- eccentric wheel
- swing type
- contracting device
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Abstract
The invention discloses a kind of swing type contracting device, comprise installing plate, drive unit, reduction device and charging box, installing plate is arranged on the charging aperture place, upper end of charging box, reduction device comprises diversion trench, eccentric wheel, coupling shaft and swinging block, eccentric wheel is provided with mounting hole, mounting hole is connected with the driving shaft of drive unit, eccentric wheel disc is also provided with connecting hole, the centre position of swinging block is provided with the slotted hole of vertical direction, one end of coupling shaft is fixedly connected with connecting hole, its other end is slidably connected with slotted hole, diversion trench is vertically arranged on the two ends of swinging block in pairs, the opening of every a pair diversion trench is relative, the bottom land of every a pair diversion trench is connected with swinging block and installing plate simultaneously rotationally, drive diversion trench to do periodic reverse together by swinging block to swing, the lower end of diversion trench extends in the inner chamber of charging box.The present invention drives diversion trench to swing by the combination of eccentric wheel, coupling shaft and swinging block, makes the even division of coal dust, the coal dust noresidue of division, nothing mixing.
Description
Technical field
The present invention relates to coal sample making technology field, particularly relate to a kind of swing type contracting device.
Background technology
Along with the development of power construction cause, constantly go into operation and run in coal-burning power plant, its operation and management level also improves thereupon, ature of coal sample detecting workload increases, mechanical sampling equipment progressively instead of artificial sample, its complexity is also more and more higher, is sampled develop into multistage sampling by initial single-stage.In mechanical sampling sample preparation, division is the key procedure of sample preparation, and object is to reduce sample size.Contracting device is the division preparation being mainly used in coal or other granule materials samples.
The coal dust contracting device overwhelming majority in the market utilizes the structure of centrifugal force division.It formed primarily of chute 24, support plate 25, upside fagging 26 and downside fagging 27 under chute 23, second division under division cavity 13, belt 14, driving pulley 15, passive belt wheel 16, rotary feeding bucket 17, the bearing collar 18, deep groove ball bearing 19, motor fixing plate 20, reducing motor 21, division baffle plate 22, first division.
As depicted in figs. 1 and 2, reducing motor 21 is arranged on motor fixing plate 20, and driving pulley 15 is inserted in motor shaft fixing, then is connected with passive belt wheel 16 by belt 14.Passive belt wheel 16 is fixedly linked with rotary feeding bucket 17, and passive belt wheel 16 is arranged on the bearing collar 18, and is bearing on support plate 25 by deep groove ball bearing 19.Support plate 25 is arranged on division cavity 13 upper end.Division baffle plate 22 is arranged on by the coal feed point of chute 24 under chute 23 and the second division under the first division, in order to adjust coal dust division amount.Last entirety is fixed by upside fagging 26 and downside fagging 37.
The principle of work of this contracting device is: reducing motor 21 drives driving pulley 15 to rotate, and driving pulley 15 recycles belt 14 and drives passive belt wheel 16 to rotate, and then the rotary feeding bucket 17 be fixed on passive belt wheel 16 is together rotated.Coal dust enters in rotary feeding bucket 17, has certain centrifugal force, outwards shed in exit by rotary motion.When rotary feeding bucket 17 outlet rotates to the coal powder entrance of chute 24 under chute 23 and the second division under the first division, a certain amount of coal dust is shed to be entered under the first division under chute 23 and the second division in chute 24, reaches the object of division.Adjustment division baffle plate 22 blocks the coal powder entrance size of chute 24 under chute 23 and the second division under the first division to adjust division amount.
Due to centrifugal action, coal dust is patted in division cavity, make in cavity, to there is a large amount of residual coal dusts, along with the carrying out detecting coal dust, residual coal dust accumulation increases, and the coal dust of detection easily produces with residual coal dust and mixes, data are inaccurate, meanwhile, after rotational speed is too high, detected coal dust can lose moisture.
Summary of the invention
The object of the invention is to overcome above-mentioned technical deficiency, a kind of swing type contracting device is provided, this contracting device uses the combination of eccentric wheel, coupling shaft and swinging block to drive diversion trench periodic reverse to swing, simultaneously, coal dust is only subject to Action of Gravity Field and does not additionally produce acceleration, thus make the even division of coal dust, and the coal dust noresidue of division, without mixing.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of swing type contracting device, comprise installing plate, drive unit, reduction device and charging box, described installing plate is arranged on the charging aperture place, upper end of described charging box;
Described reduction device comprises diversion trench, eccentric wheel, coupling shaft and swinging block, described eccentric wheel is provided with mounting hole, described mounting hole is connected with the driving shaft of described drive unit, described eccentric wheel disc is also provided with connecting hole, the centre position of described swinging block is provided with the slotted hole of vertical direction, one end of described coupling shaft is fixedly connected with described connecting hole, its other end is slidably connected with described slotted hole, described diversion trench is vertically arranged on the two ends of described swinging block in pairs, described in every a pair, the opening of diversion trench is relative, the bottom land of every a pair diversion trench is connected with described swinging block and described installing plate simultaneously rotationally, drive described diversion trench to do periodic reverse together by described swinging block to swing, the lower end of described diversion trench extends in the inner chamber of described charging box.
Wherein, described connecting hole is waist-shaped hole, one end of described waist-shaped hole to the other end gradually away from the center of circle of described mounting hole.
Wherein, one end that described coupling shaft is connected with the slotted hole on described swinging block is provided with rolling bearing, and inner ring and the described coupling shaft of described rolling bearing are rotationally connected, and the slotted hole on the outer ring of described rolling bearing and described swinging block is slidably connected.
Wherein, the bottom land of described diversion trench is provided with the first rotating shaft and the second rotating shaft that level is fixedly installed, the upper end of described bottom land is located in described first rotating shaft, described second rotating shaft is arranged on the below of described first rotating shaft, the two ends of described first rotating shaft are rotationally connected by revolving member and described swinging block, and the two ends of described second rotating shaft are rotationally connected by revolving member and described installing plate.
Wherein, described revolving member is rolling bearing, and described rolling bearing is arranged in corresponding bearing seat.
Wherein, described drive unit is reducing motor, and described reducing motor is fixedly connected with described installing plate by motor cabinet.
Wherein, the motor shaft of described reducing motor is fixedly connected with described eccentric mounting hole.
Wherein, be provided with packing plate in described charging box, described charging box is divided into multiple cavity by described packing plate, and described in each, the bottom of cavity is provided with discharging opening.
Compared with prior art, the present invention has following beneficial effect:
A kind of swing type contracting device provided by the invention, drive motor is used to drive eccentric wheel to rotate, eccentric wheel is by coupling shaft assemblage zone movable pendulum motion block reciprocally swinging, and swinging block is connected with diversion trench, and then drives diversion trench to do identical swings equally, smooth surface in contracting device, without any concaveconvex structure, and coal dust is only subject to Action of Gravity Field and does not additionally produce acceleration, and direction of motion is basic consistent with Impact direction, therefore, there is not the phenomenons such as coal dust is residual, accumulation, leakage coal in this contracting device.
Accompanying drawing explanation
Fig. 1 is the Sidelong portion schematic diagram of the contracting device of prior art;
The schematic top plan view of the contracting device of Fig. 2 prior art;
Fig. 3 is the Sidelong portion schematic diagram of swing type contracting device provided by the invention;
Fig. 4 is the side tangent plane schematic diagram of swing type contracting device provided by the invention;
Fig. 5 is eccentric front elevational schematic provided by the invention;
Fig. 6 is eccentric side provided by the invention tangent plane schematic diagram;
Fig. 7 is the Sidelong portion schematic diagram of diversion trench provided by the invention;
Fig. 8 is the schematic side view of diversion trench provided by the invention.
In figure, 1: installing plate; 2: drive motor; 3: charging box; 4: diversion trench; 5: eccentric wheel; 6: coupling shaft; 7: swinging block; 8: the first rotating shafts; 9: the second rotating shafts; 10: motor cabinet; 11: packing plate; 12: bearing seat; 13: division cavity; 14: belt; 15: driving pulley; 16: passive belt wheel; 17: rotary feeding bucket; 18: the bearing collar; 19: deep groove ball bearing; 20: motor fixing plate; 21: reducing motor; 22: division baffle plate; Chute under 23: the first divisions; Chute under 24: the second divisions; 25: support plate; 26: upside fagging; 27: downside fagging; 51: mounting hole; 52: connecting hole.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
In describing the invention, it will be appreciated that, term " on ", D score, "left", "right", " interior ", " outward ", " level ", the orientation of the instruction such as " vertically " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
As shown in Figure 3 and Figure 4, be a kind of swing type contracting device provided by the invention, comprise installing plate 1, drive unit 2, reduction device and charging box 3, installing plate 1 is arranged on the charging aperture place, upper end of charging box 3, reduction device comprises diversion trench 4, eccentric wheel 5, coupling shaft 6 and swinging block 7, eccentric wheel 5 is provided with mounting hole 51, mounting hole 51 is connected with the driving shaft of drive unit 2, the wheel disc of eccentric wheel 5 is also provided with connecting hole 52, the centre position of swinging block 7 is provided with the slotted hole of vertical direction, one end of coupling shaft 6 is fixedly connected with connecting hole 52, its other end is slidably connected with slotted hole, diversion trench 4 is vertically arranged on the two ends of swinging block 7 in pairs, described in every a pair, the opening of diversion trench 4 is relative, the bottom land of every a pair diversion trench is connected with swinging block 7 and described installing plate 1 simultaneously rotationally, drive diversion trench 4 to do periodic reverse together by swinging block 7 to swing, the lower end of diversion trench 4 extends in the inner chamber of charging box 3, this contracting device drives eccentric wheel 5 to rotate by using drive unit 2, eccentric wheel 5 is again by coupling shaft 6 assemblage zone movable pendulum motion block 7 reciprocally swinging, because swinging block 7 is connected with diversion trench 4, therefore, diversion trench 4 does identical swings too, when coal dust falls, by the reciprocally swinging of diversion trench 4, coal dust is made to enter charging box 3, reach the object of the average division of coal dust.
Preferably, connecting hole 52 is waist-shaped hole, one end of waist-shaped hole to the other end gradually away from the center of circle of mounting hole 51, as shown in Figure 6, mounting hole 51 is preferably placed at the center of eccentric wheel 5, and be provided with annular dome at center position, therefore the center of eccentric wheel 5 and center of gravity be not in same level, and then realize the reciprocally swinging of rotating band movable pendulum motion block 7 of eccentric wheel 5; As shown in Figure 5, eccentric wheel 5 is preferably provided with two waist-shaped holes, each waist-shaped hole is vortex-like wire, so that the radius that adjustment eccentric wheel 5 drives coupling shaft 6 to rotate, and then controls the amplitude of fluctuation of diversion trench 4.
Preferably, one end that coupling shaft 6 is connected with the slotted hole on swinging block 7 is provided with rolling bearing, inner ring and the coupling shaft 6 of rolling bearing are rotationally connected, slotted hole on the outer ring of rolling bearing and swinging block 7 is slidably connected, and rolling bearing preferably uses deep groove ball bearing, and deep groove ball bearing is comparatively common, structure is simple, can bear radial load and axial load, its friction factor is less simultaneously, and rotating speed is also higher; Coupling shaft 6 is fixed with the inner ring axial locking of deep groove ball bearing, and be inserted in the slotted hole on swinging block 7, when eccentric wheel 5 drives coupling shaft 6 to rotate, the other end of coupling shaft 6 slides up and down in slotted hole, thus swinging block 7 is swung, because swinging block 7 is connected with diversion trench 4, therefore, diversion trench 4 does identical swings too.
The number of diversion trench 4 is preferably a pair, be symmetricly set on the two ends of swinging block 7 respectively, the opening of two diversion trenchs 4 is relative, the number of diversion trench 4 also can be set to multipair by the coal dust amount according to division, when coal dust free-falling, the opening of every a pair diversion trench 4 is set to relative position, when diversion trench 4 swings simultaneously, can effective division coal dust, raise the efficiency, reduce discarded coal dust amount.
Preferably, the bottom land of diversion trench 4 is provided with the first rotating shaft 8 and the second rotating shaft 9 that level is fixedly installed, the upper end of bottom land is located in first rotating shaft 8, second rotating shaft 9 is arranged on the below of the first rotating shaft 8, the two ends of the first rotating shaft 8 are rotationally connected by revolving member and swinging block 7, the two ends of the second rotating shaft 9 are rotationally connected by revolving member and installing plate 1, as shown in Figure 7 and Figure 8, because the opening of two diversion trenchs 4 is oppositely arranged, therefore, first rotating shaft 8 and the second rotating shaft 9 level are fixedly installed on the bottom land of diversion trench 4, and be connected with swinging block 7 and installing plate 1 respectively, when swinging block 7 swings at vertical direction, so that make diversion trench 4 can follow swinging block 7 together in the vertical direction swing.
Preferably, revolving member is rolling bearing, rolling bearing is arranged in corresponding bearing seat, rolling bearing is preferably deep groove ball bearing equally, first rotating shaft 8 and the second rotating shaft 9 all adopt deep groove ball bearing to support, install rationally, smooth running, noiselessness and without airborne dust when ensureing to run, ensures that there is good stability in mechanism.
Preferably, drive unit 2 is reducing motor, reducing motor is fixedly connected with installing plate 1 by motor cabinet 10, the motor shaft of reducing motor is fixedly connected with the mounting hole 51 of eccentric wheel 5, as shown in Figure 4, reducing motor is arranged on motor cabinet 10, fixed by screw lock, same, motor cabinet 10 is fixedly mounted on the correspondence position of installing plate 1 by screw, is inserted into by the turning axle of reducing motor in the mounting hole 51 of eccentric wheel 5, adjusted position postpone, fix by screw lock, reducing motor band movable eccentric wheel 5 is rotated, and then drive diversion trench 4 to swing.
Preferably, packing plate 11 is provided with in charging box 3, charging box 3 is divided into multiple cavity by packing plate 11, the bottom of each cavity is provided with discharging opening, as shown in Figure 3, charging box 3 is divided into three cavitys, and described cavity bottom is provided with successively and looks into sample mouth, abandons sample mouth and sample leaving opening, the division coal dust obtained is substantially equal, and the amount of intercepting meets randomness and homogeny; The upper end of charging box 3 is provided with charging aperture, and wherein the drop-off positions of coal dust is between the opening of two diversion trenchs 4, so that the average division coal dust of diversion trench 4.
Principle of work of the present invention: coupling shaft 6 is fixed on eccentric wheel 5 connecting hole 52, reducing motor band movable eccentric wheel 5 rotates, coupling shaft 6 moves in a circle around reducing motor axle, when eccentric wheel 5 rotates clockwise 90 °, coupling shaft 6 in the slotted hole of swinging block 7 is from top slide downward, swinging block 7 swings to the right simultaneously, because swinging block 7 is connected with diversion trench 4, therefore, swinging block 7 drives diversion trench 4 to be also tilted to the right, and realizes swinging, in like manner, when swinging block 7 rotates clockwise successively, principle of work is same as described above; When falling behind under coal dust, being swung by diversion trench 4, making coal dust enter three cavitys, reach the object of division; The division coal dust amount entering different cavity can be realized by the position of the connecting hole 52 of adjustment coupling shaft 6 on eccentric wheel 5.
In sum, swing type contracting device provided by the invention, can make coal dust only be subject to Action of Gravity Field, and direction of motion is basic consistent with Impact direction, and this contracting device is not existed phenomenons such as coal dust is residual, accumulation, leakage coal; Because the present invention has outstanding combination property, therefore can integral protection, make profile more elegant in appearance.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a swing type contracting device, it is characterized in that, comprise installing plate (1), drive unit (2), reduction device and charging box (3), described installing plate (1) is arranged on the charging aperture place, upper end of described charging box (3);
Described reduction device comprises diversion trench (4), eccentric wheel (5), coupling shaft (6) and swinging block (7), described eccentric wheel (5) is provided with mounting hole (51), described mounting hole (51) is connected with the driving shaft of described drive unit (2), the wheel disc of described eccentric wheel (5) is also provided with connecting hole (52), the centre position of described swinging block (7) is provided with the slotted hole of vertical direction, one end of described coupling shaft (6) is fixedly connected with described connecting hole (52), its other end is slidably connected with described slotted hole, described diversion trench (4) is vertically arranged on the two ends of described swinging block (7) in pairs, described in every a pair, the opening of diversion trench (4) is relative, the bottom land of every a pair diversion trench is connected with described swinging block (7) and described installing plate (1) simultaneously rotationally, drive described diversion trench (4) to do periodic reverse together by described swinging block (7) to swing, the lower end of described diversion trench (4) extends in the inner chamber of described charging box (3).
2. swing type contracting device according to claim 1, is characterized in that, described connecting hole (52) is waist-shaped hole, one end of described waist-shaped hole to the other end gradually away from the center of circle of described mounting hole (51).
3. swing type contracting device according to claim 1, it is characterized in that, one end that described coupling shaft (6) is connected with the slotted hole on described swinging block (7) is provided with rolling bearing, inner ring and the described coupling shaft (6) of described rolling bearing are rotationally connected, and the slotted hole on the outer ring of described rolling bearing and described swinging block (7) is slidably connected.
4. swing type contracting device according to claim 1, it is characterized in that, the bottom land of described diversion trench (4) is provided with the first rotating shaft (8) and the second rotating shaft (9) that level is fixedly installed, described first rotating shaft (8) is located at the upper end of described bottom land, described second rotating shaft (9) is arranged on the below of described first rotating shaft (8), the two ends of described first rotating shaft (8) are rotationally connected by revolving member and described swinging block (7), and the two ends of described second rotating shaft (9) are rotationally connected by revolving member and described installing plate (1).
5. swing type contracting device according to claim 4, is characterized in that, described revolving member is rolling bearing, and described rolling bearing is arranged in corresponding bearing seat.
6. swing type contracting device according to claim 1, is characterized in that, described drive unit (2) is reducing motor, and described reducing motor is fixedly connected with described installing plate (1) by motor cabinet (10).
7. swing type contracting device according to claim 6, is characterized in that, the motor shaft of described reducing motor is fixedly connected with the mounting hole (51) of described eccentric wheel (5).
8. swing type contracting device according to claim 1, it is characterized in that, packing plate (11) is provided with in described charging box (3), described charging box (3) is divided into multiple cavity by described packing plate (11), and described in each, the bottom of cavity is provided with discharging opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510695451.6A CN105223056B (en) | 2015-10-23 | 2015-10-23 | A kind of swing type contracting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510695451.6A CN105223056B (en) | 2015-10-23 | 2015-10-23 | A kind of swing type contracting device |
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| Publication Number | Publication Date |
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| CN105223056A true CN105223056A (en) | 2016-01-06 |
| CN105223056B CN105223056B (en) | 2018-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510695451.6A Active CN105223056B (en) | 2015-10-23 | 2015-10-23 | A kind of swing type contracting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404445A (en) * | 2016-09-30 | 2017-02-15 | 湖南万通科技股份有限公司 | Material reduction and division device |
| CN106969944A (en) * | 2017-04-28 | 2017-07-21 | 湖南三德科技股份有限公司 | A kind of spiral sampling device |
| CN107807010A (en) * | 2017-10-31 | 2018-03-16 | 华刚矿业股份有限公司 | pipeline sampler |
| CN108375494A (en) * | 2018-04-08 | 2018-08-07 | 中山市宏唯自动化科技有限公司 | A kind of reciprocating swing reduction device |
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| GB588766A (en) * | 1944-10-05 | 1947-06-03 | Allever Burton Seaborne | Improved means for automatically sampling coal, grain or like granular materials |
| DE2933291A1 (en) * | 1979-08-17 | 1981-03-26 | Klöckner-Humboldt-Deutz AG, 51063 Köln | Specimen separator for solids and/or liquids - has divider with several adjustable deflectors in circular arrangement on rotary axis for material distribution |
| US4817442A (en) * | 1984-11-07 | 1989-04-04 | Brian Christoperh Coupe | Sample splitter |
| CN104181021A (en) * | 2014-08-26 | 2014-12-03 | 长沙开元仪器股份有限公司 | Diversion-type splitter and splitting method |
| CN205120447U (en) * | 2015-10-23 | 2016-03-30 | 长沙开元仪器股份有限公司 | Oscillating division machine |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB588766A (en) * | 1944-10-05 | 1947-06-03 | Allever Burton Seaborne | Improved means for automatically sampling coal, grain or like granular materials |
| DE2933291A1 (en) * | 1979-08-17 | 1981-03-26 | Klöckner-Humboldt-Deutz AG, 51063 Köln | Specimen separator for solids and/or liquids - has divider with several adjustable deflectors in circular arrangement on rotary axis for material distribution |
| US4817442A (en) * | 1984-11-07 | 1989-04-04 | Brian Christoperh Coupe | Sample splitter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404445A (en) * | 2016-09-30 | 2017-02-15 | 湖南万通科技股份有限公司 | Material reduction and division device |
| CN106404445B (en) * | 2016-09-30 | 2023-07-07 | 湖南万通科技股份有限公司 | Material dividing device |
| CN106969944A (en) * | 2017-04-28 | 2017-07-21 | 湖南三德科技股份有限公司 | A kind of spiral sampling device |
| CN106969944B (en) * | 2017-04-28 | 2024-03-01 | 湖南三德科技股份有限公司 | Spiral sampling device |
| CN107807010A (en) * | 2017-10-31 | 2018-03-16 | 华刚矿业股份有限公司 | pipeline sampler |
| CN108375494A (en) * | 2018-04-08 | 2018-08-07 | 中山市宏唯自动化科技有限公司 | A kind of reciprocating swing reduction device |
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|---|---|
| CN105223056B (en) | 2018-01-16 |
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Effective date of registration: 20190603 Address after: 410100 Xingsha Industrial Base (Changlong Street), Changsha Economic and Technological Development Zone, Changsha City, Hunan Province, No. 1259, Liangtang East Road Patentee after: Changsha Kaiyuan Instruments Co.,Ltd. Address before: 410100 No. 172 Kaiyuan Road, Changsha economic and Technological Development Zone, Changsha, Hunan Patentee before: CHANGSHA KAIYUAN INSTRUMENTS Co.,Ltd. |
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Denomination of invention: Swing type division machine Effective date of registration: 20200615 Granted publication date: 20180116 Pledgee: Changsha Bank city branch of Limited by Share Ltd. Pledgor: CHANGSHA KAIYUAN INSTRUMENTS Co.,Ltd. Registration number: Y2020980003086 |
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Date of cancellation: 20230717 Granted publication date: 20180116 Pledgee: Changsha Bank city branch of Limited by Share Ltd. Pledgor: Changsha Kaiyuan Instruments Co.,Ltd. Registration number: Y2020980003086 |