CN112718061B - Single-cylinder cone crusher vibration reduction adjusting method based on stepless adjustment of eccentric block - Google Patents
Single-cylinder cone crusher vibration reduction adjusting method based on stepless adjustment of eccentric block Download PDFInfo
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- CN112718061B CN112718061B CN202011321978.XA CN202011321978A CN112718061B CN 112718061 B CN112718061 B CN 112718061B CN 202011321978 A CN202011321978 A CN 202011321978A CN 112718061 B CN112718061 B CN 112718061B
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- eccentric
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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
- B02C2/00—Crushing or disintegrating by gyratory or cone crushers
- B02C2/02—Crushing or disintegrating by gyratory or cone crushers eccentrically moved
- B02C2/04—Crushing or disintegrating by gyratory or cone crushers eccentrically moved with vertical axis
- B02C2/042—Moved by an eccentric weight
Abstract
The invention discloses a vibration reduction adjusting method of a single-cylinder cone crusher based on stepless adjustment of an eccentric block, wherein an adjustable eccentric block is arranged on an eccentric assembly, the eccentric force of a main shaft assembly is balanced by adjusting the position of the eccentric block, the eccentric copper sleeve scales and the eccentric steel sleeve scales pointing to the circle center are processed at the thin edges of the upper end surfaces of an eccentric copper sleeve and an eccentric steel sleeve, when the eccentric copper sleeve and the eccentric steel sleeve are combined at different angles, an included angle can be formed by the eccentric copper sleeve scales and the eccentric steel sleeve scales, the central line of the included angle points to the eccentric direction of equipment, the specific installation position of the eccentric block can be determined according to the included angle, the fact that the eccentric force generated by the eccentric block is in collinear reversal with the eccentric force generated by the main shaft assembly is guaranteed, and the optimal vibration reduction effect is achieved. The eccentric block can be adjusted to balance the eccentric force of the spindle assembly, so that the vibration of the equipment is weakened, the damage of the equipment to parts such as an installation foundation, a motor, an external pipeline and the like is reduced, and the utilization rate of energy is improved.
Description
Technical Field
The invention relates to the technical field of single-cylinder cone crushers, in particular to a vibration reduction adjusting method of a single-cylinder cone crusher based on stepless adjustment of an eccentric block.
Background
The single-cylinder hydraulic cone crusher can be widely applied to the industrial fields of black, non-ferrous and non-metallic mines, sandstone materials and the like. The characteristics of large crushing force, high production efficiency, lamination crushing, uniform grain shape of a finished product, less consumption of consumable parts, low operation cost and the like enable the single-cylinder hydraulic cone crusher to play an indispensable important role in the crushing industry. The principle is that a pair of meshed gears drives an eccentric assembly to rotate, a main shaft assembly is driven by the eccentric assembly to do pendulous motion, and materials in a crushing cavity are crushed in an extruding mode.
Just because of the high-speed rotation of the eccentric structure, the gravity centers of the eccentric assembly and the main shaft assembly are not coincident with the high-speed rotation axis, so the rotating states of the eccentric assembly and the main shaft assembly are not in a balanced state, and a larger centrifugal force is generated at the position of the gravity center, which is the main reason that the working state of the single-cylinder cone crusher can generate high frequency and large vibration.
The hazards posed by the overall vibration of the equipment are manifold. Firstly, the equipment installation foundation brings periodic fatigue due to long-term vibration participation, the strength of the structure is reduced, and the service life is greatly reduced. And secondly, a driving motor is directly connected with the equipment, the bearing at the output end of the motor is unevenly stressed, and the output of the motor is unstable. The mechanical part and hydraulic pressure station and electrical system need use oil pipe, power cord, signal line connection, and equipment vibration can transmit the pipeline on the circuit, leads to the sealed effect of kneck to weaken, can the looks mutual friction between cable and the pipeline, also can produce the friction between cable and oil pipe and the basis, leads to cable and pipeline wearing and tearing, and light then equipment damage is shut down, and heavy then electric leakage hinders the people. Meanwhile, the equipment vibrates, noise pollution is increased, hearing damage is directly caused to field workers, and the overall evaluation level of the equipment is influenced. Finally, from the viewpoint of energy conservation, the main energy source of the equipment is electric energy, most of the energy is converted into crushing energy for crushing materials through a mechanical structure, one part of the energy is converted into heat energy generated by friction when the mechanical structure operates, and the other part of the energy is converted into kinetic energy generated by integral vibration of the equipment.
An eccentric counterweight structure of an inertia cone crusher CN201320297960.X proposes a scheme for damping the inertia cone crusher: the upper part of a transmission shaft of the inertia cone crusher is provided with an eccentric block which is opposite to the equipment with the same weight direction as the eccentric block of the equipment, so that the vibration of the whole equipment is weakened. This scheme is only applicable to the inherent design of inertia circular cone structurally, and single cylinder hydraulic cone crusher principle and structure are all different with it, do not have fixed eccentric block to produce the vibration, and the installation direction of transmission shaft is parallel with the vibration direction, can't implement this scheme, and the adjustment of its balancing weight direction is comparatively complicated and inconvenient.
In cone crusher 200420085121.2, the purpose of increasing eccentric force is achieved by installing a counterweight on a rack gear, but the vibration amplitude of the equipment is increased, the crushing effect is improved, and the overall stability of the equipment is adversely affected.
Disclosure of Invention
In order to weaken the vibration of the whole equipment under the condition of maintaining the eccentric swing of a main shaft assembly, the invention discloses a vibration reduction adjusting method of a single-cylinder cone crusher based on stepless adjustment of an eccentric block.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a single cylinder cone crusher damping adjustment method based on eccentric block infinitely variable control, installs adjustable eccentric block on eccentric assembly, comes the eccentric power of balanced main shaft assembly through the position of adjusting eccentric block to realize the whole damping of equipment and adjust.
Specifically, the eccentric assembly comprises an eccentric steel sleeve, an eccentric copper sleeve, a large gear rack and an eccentric block; the large gear rack is provided with a plurality of eccentric block fixing bolt holes, the eccentric block is provided with a plurality of waist-shaped holes, and the eccentric block fixing bolt holes and the waist-shaped holes are connected through a plurality of bolts so that the eccentric block is fixed on the large gear rack; the eccentric copper bush penetrates into the eccentric steel bush, the outer ring of the eccentric steel bush is matched with the inner ring of the large gear rack, and the eccentric copper bush, the large gear rack and the large gear rack are fixed in pairs by using keys; the eccentric steel sleeve is in a cylindrical shape with the central axes of the outer ring and the inner ring not coincident, the wall thickness is changed along the circumferential direction and the axial direction, a key groove is processed on the inner ring, a key groove is processed on the top of the outer ring, and the part of the thinnest wall of the upper end surface is processed with an eccentric steel sleeve scale pointing to the circle center; the eccentric copper bush is in a cylindrical shape with the central axes of the outer ring and the inner ring not coincident, the wall thickness is changed along the circumferential direction and the axial direction, the outer ring is processed with a plurality of key grooves, and the thinnest wall of the upper end surface is processed with eccentric copper bush scales pointing to the circle center; the upper end face is provided with an eccentric block scale pointing to the circle center; when the single-cylinder cone crusher is installed, under different working conditions, when the eccentric copper sleeve and the eccentric steel bushing are combined at different angles, the scales of the eccentric copper sleeve and the scales of the eccentric steel bushing form an included angle, the center line of the included angle points to the eccentric direction of the equipment, the scale line of the eccentric block is aligned to the changed line, the collinear reversal of the centrifugal force generated by the eccentric block and the eccentric force of the spindle assembly can be ensured, and the optimal vibration reduction effect is realized.
Furthermore, the large gear carrier is a circular ring with a step-shaped cross section, a plurality of threaded holes are machined in the step surface of the upper part of the large gear carrier, and a key groove is machined in the inner ring of the large gear carrier; the eccentric block is in a fan shape with a thick outer side and a thin inner side, and a multi-section fan-shaped waist-shaped hole is processed on the thin surface of the eccentric block.
Furthermore, the processing quantity of the threaded holes in the rack gear is more than that of the mounting holes in the eccentric blocks, so that the positions of the eccentric blocks can be conveniently adjusted, the direction of centrifugal force generated by the eccentric blocks can be changed, and the centrifugal force in different directions can be balanced.
Furthermore, the position of the threaded hole on the big gear rack is processed on the upper step surface of the big gear rack and is closer to the rotation center, and according to Newton's second law:
F＝m*a＝m*ω2*r
the mass m of the threaded hole to be machined and removed is constant, the closer to the rotation center, the smaller r is, the smaller centrifugal force F generated by the mass is, and the smaller influence of the machining and removal on the rotation of the large gear rack is.
Furthermore, the eccentric block is in a fan shape with a thick outer side and a thin inner side, a multi-section fan-shaped waist-shaped hole is formed in the thin surface of the inner side of the eccentric block, the eccentric block is matched with a plurality of threaded holes in the rack gear to realize stepless adjustment of the direction so as to adapt to the change of the centrifugal force direction when the thickness of the eccentric copper sleeve is matched with that of the eccentric steel sleeve, and the center of the upper end surface is provided with an eccentric block scale pointing to the center of a circle, so that the installation position of the eccentric block can be conveniently confirmed.
Furthermore, the processing position of the waist-shaped hole is a surface which is close to the rotation center of the large gear rack and has smaller thickness. The same principle is based on F m a omega2And r, the smaller the thickness m of the kidney-shaped hole is removed, the smaller the thickness m is, the closer the bull gear frame is to the self-transmission center r, and the less centrifugal force generated during the working of the eccentric block is reduced by removing the part by machining.
Furthermore, the eccentric block is made of a material with high density, so that the eccentric block can generate enough eccentric force in a limited installation space.
Further, the whole width of the eccentric block can be selectively assembled according to different centrifugal forces.
The invention has the beneficial effects that: the eccentric block is in a fan shape with thick outer side and thin inner side, a multi-section fan-shaped waist-shaped hole is processed on the thin surface of the inner side of the eccentric block, the direction can be adjusted in a stepless mode by matching with a plurality of threaded holes in the rack gear, the change of the centrifugal force direction when the thickness of the eccentric copper sleeve and the thickness of the eccentric steel sleeve are matched is adapted, the eccentric block scale pointing to the circle center is processed in the center of the upper end face, and the installation position of the eccentric block can be conveniently confirmed. The eccentric copper sleeve scales and the eccentric steel sleeve scales pointing to the circle center are processed at the thin edges of the upper end faces of the eccentric copper sleeve and the eccentric steel sleeve, when the eccentric copper sleeve and the eccentric steel sleeve are combined at different angles, an included angle can be formed by the eccentric copper sleeve scales and the eccentric steel sleeve scales, the center line of the included angle points to the eccentric direction of the equipment, the specific installation position of the eccentric block can be determined according to the included angle, the collinear reversal of the eccentric force generated by the eccentric block and the eccentric force generated by the spindle assembly is ensured, and the optimal vibration reduction effect is realized.
Drawings
FIG. 1 is a schematic view of a bull gear rack configuration;
FIG. 2 is a schematic view of an eccentric mass;
FIG. 3 is a schematic view of the eccentric assembly in operation;
FIG. 4 is a cross-sectional view of the eccentric assembly;
FIG. 5 is a top view of the eccentric assembly.
In the figure: 1. a main shaft assembly; 2. an eccentric assembly; 3. an eccentric assembly rotation central shaft; 4. a spindle assembly axis; 21. a key; 22. a large gear rack; 23. a hexagon socket head cap screw; 24. a bull gear; 25. pressing a ring; 26. a bolt; 27. an eccentric block; 28. an eccentric copper bush; 29. a key; 210, eccentric steel sleeve; 27. an eccentric block; 271. the scale of the eccentric block; 28. an eccentric copper bush; 281. eccentric copper bush scales; 210. an eccentric sleeve; 2101. and (5) graduations of the eccentric steel sleeve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1-4, in order to realize the vibration damping adjustment of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block, the eccentric assembly of the single-cylinder cone crusher comprises a key 21, a large gear rack 22, an inner hexagon bolt 23, a large gear 24, a pressing ring 25, a bolt 26, an eccentric block 27, an eccentric copper sleeve 28, a key 29 and an eccentric steel sleeve 210; the inner ring of the large gear frame 22 is matched with the outer ring of the eccentric steel sleeve 210 and is circumferentially fixed through a key 21, the large gear 24 is fixed below the large gear frame 22 through an inner hexagon bolt 23 to transmit torque, the eccentric block 27 is fixed on the upper portion of the large gear frame 22 through a bolt 26, the outer ring of the eccentric copper sleeve 28 is matched with the inner ring of the eccentric steel sleeve 210 and is fixed through a key 29, and the large gear frame 22, the eccentric copper sleeve 28 and the eccentric steel sleeve 210 are circumferentially fixed through a pressing ring 25. The main shaft assembly 1 penetrates through the inner ring of the eccentric copper sleeve 28, and the rotation central shaft 3 of the eccentric assembly and the axis 4 of the main shaft assembly form an included angle.
The central axes of the outer ring and the inner ring of the eccentric steel sleeve 210 and the eccentric copper sleeve 28 are not overlapped, and the outer ring of the eccentric copper sleeve 28 is provided with a plurality of key groove selection installation keys 29, so that the size and the direction of an included angle generated by the eccentric assembly rotation central shaft 3 and the main shaft assembly axis 4 are changed, and the reason of generating eccentric force in the working state of the main shaft assembly 1 is changed.
The eccentric steel bushing scale 2101 and the eccentric copper bush scale 281 pointing to the circle center are processed at the thin edges of the upper end faces of the eccentric steel bushing 210 and the eccentric copper bush 28, when the eccentric steel bushing 210 and the eccentric copper bush 28 are combined according to actual requirements of equipment, an included angle is formed between the eccentric steel bushing scale 2101 and the eccentric copper bush scale 281, the center line of the included angle at the thin edge is collinear with the direction of the eccentric force of the spindle assembly 1, and at the moment, the eccentric block scale line 271 of the eccentric block 27 is aligned with the changed line to be mounted, so that the collinear reversal of the centrifugal force generated by the eccentric block 27 and the eccentric force of the spindle assembly 1 can be ensured, and the optimal vibration reduction effect is achieved.
The bull gear rack 22 is a circular ring with a step-shaped cross section, and a plurality of bolt holes are formed in the step surface of the upper portion of the bull gear rack, so that the installation position of the eccentric block 27 can be adjusted to change the direction of centrifugal force generated by the eccentric block 27 in the working process.
The machining position of the threaded hole of the large carrier 22 is located inside the eccentric assembly rotation center shaft 3, and the machining position has an effect of reducing the influence of the threaded hole on the rotation of the large carrier 22.
The eccentric block 27 is shaped like a fan with a thick outer side and a thin inner side, a plurality of mounting holes are formed in the thin inner side, and different widths are selected according to the included angle formed between the eccentric assembly rotation central shaft 3 and the spindle assembly axis 4.
The mounting hole of the eccentric block 27 is a fan-shaped waist-shaped hole, and the eccentric block 27 has the effects that when the mounting angle of the eccentric block 27 is adjusted, stepless adjustment can be achieved, the centrifugal force generated by the eccentric block and the centrifugal force generated by the main shaft assembly are in the same straight line in the opposite directions, and the effects of reducing the whole vibration amplitude of equipment and even neutralizing the equipment are achieved.
The mounting hole of the eccentric block 27 is processed on the thin surface at the inner side, so that the centrifugal force of the opening on the eccentric block can be reduced as much as possible.
The eccentric block 27 is made of a material with a high density, so that the mass of the eccentric block is large enough, and the centrifugal force generated by the eccentric block in a limited installation space is large enough.
After the eccentric assembly is processed in the manner, the vibration reduction adjusting method of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block comprises the following specific steps of processing the eccentric copper bush 28 and the eccentric steel bush 210; the large gear frame 22 is assembled in the single-cylinder cone crusher in the manner described above, after the device is tested, an included angle is formed by the eccentric steel sleeve scale 2101 and the eccentric copper sleeve scale 281, the center line of the included angle at the thin edge is collinear with the direction of the eccentric force of the main shaft assembly 1, and at the moment, the eccentric block scale line 271 of the eccentric block 27 is aligned with the changed line to be installed, so that the collinear reversal of the centrifugal force generated by the eccentric block 27 and the eccentric force of the main shaft assembly 1 can be ensured (the eccentric block scale line 271 is aligned with the center line of the included angle and installed on the side close to the thin edge). The adjustment is completed by locking the eccentric mass 27 to the bull gear rack 22 by means of bolts. When the mobile equipment is installed again, the eccentric block 27 is firstly disassembled, then the equipment is reinstalled and the test operation is carried out again, the included angle between the eccentric steel sleeve scale 2101 and the eccentric copper sleeve scale 281 is determined, then the eccentric block scale mark 271 of the eccentric block 27 is aligned to the changed line for installation, and the collinear reversal of the centrifugal force generated by the eccentric block 27 and the eccentric force of the main shaft assembly 1 can be ensured, and the installation of the eccentric assembly is completed.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A vibration reduction adjusting method of a single-cylinder cone crusher based on stepless adjustment of eccentric blocks is characterized by comprising the following steps: an adjustable eccentric block is arranged on the eccentric assembly, and the eccentric force of the main shaft assembly is balanced by adjusting the position of the eccentric block, so that the whole vibration reduction adjustment of the equipment is realized; the eccentric assembly comprises an eccentric steel sleeve, an eccentric copper sleeve, a large gear carrier and an eccentric block; the large gear rack is provided with a plurality of eccentric block fixing bolt holes, the eccentric block is provided with a plurality of waist-shaped holes, and the eccentric block fixing bolt holes and the waist-shaped holes are connected through a plurality of bolts so that the eccentric block is fixed on the large gear rack; the eccentric copper bush penetrates into the eccentric steel bush, the outer ring of the eccentric steel bush is matched with the inner ring of the large gear rack, and the eccentric copper bush, the large gear rack and the large gear rack are fixed in pairs by using keys; the eccentric steel sleeve is in a cylindrical shape with the central axes of the outer ring and the inner ring not coincident, the wall thickness is changed along the circumferential direction and the axial direction, a key groove is processed on the inner ring, a key groove is processed on the top of the outer ring, and the part of the thinnest wall of the upper end surface is processed with an eccentric steel sleeve scale pointing to the circle center; the eccentric copper bush is in a cylindrical shape with the central axes of the outer ring and the inner ring not coincident, the wall thickness is changed along the circumferential direction and the axial direction, the outer ring is processed with a plurality of key grooves, and the thinnest wall of the upper end surface is processed with eccentric copper bush scales pointing to the circle center; the upper end face is provided with an eccentric block scale pointing to the circle center; when the single cylinder cone crusher is installed, under different working conditions, when the eccentric copper sleeve and the eccentric steel bushing are combined at different angles, the eccentric copper sleeve scales and the eccentric steel bushing scales can form an included angle, the included angle center line points to the eccentric direction of the equipment, the eccentric block scale mark of the eccentric block is aligned to the eccentric direction of the included angle center line, the collinear reversal of the centrifugal force generated by the eccentric block and the eccentric force of the main shaft assembly can be ensured, and the optimal vibration reduction effect is realized.
2. The method for adjusting the vibration reduction of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block as claimed in claim 1, wherein the method comprises the following steps: the large gear carrier is a circular ring with a step-shaped cross section, a plurality of threaded holes are formed in the step surface of the upper part of the large gear carrier, and a key groove is formed in the inner ring of the large gear carrier; the eccentric block is in a fan shape with a thick outer side and a thin inner side, and a multi-section fan-shaped waist-shaped hole is processed on the thin surface of the eccentric block.
3. The method for adjusting the vibration reduction of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block as claimed in claim 1, wherein the method comprises the following steps: the processing quantity of the threaded holes in the rack gear is more than that of the mounting holes in the eccentric blocks, so that the positions of the eccentric blocks can be adjusted conveniently, the direction of centrifugal force generated by the eccentric blocks can be changed, and the centrifugal force in different directions can be balanced.
4. The method for adjusting the vibration reduction of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block as claimed in claim 1, wherein the method comprises the following steps: the position of the threaded hole on the big gear frame is processed on the step surface on the upper part of the big gear frame and is closer to the rotation center.
5. The method for adjusting the vibration reduction of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block as claimed in claim 1, wherein the method comprises the following steps: the waist-shaped hole is processed at a position close to the rotation center of the large gear rack and is a surface with smaller thickness.
6. The method for adjusting the vibration reduction of the single-cylinder cone crusher based on the stepless adjustment of the eccentric block as claimed in claim 1, wherein the method comprises the following steps: after the eccentric copper sleeve and the eccentric sleeve are combined, an included angle is formed between the scales of the eccentric steel sleeve and the scales of the eccentric copper sleeve, and the scales of the eccentric block are aligned to the center line of the included angle and are arranged on one side close to the thin edge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011321978.XA CN112718061B (en) | 2020-11-23 | 2020-11-23 | Single-cylinder cone crusher vibration reduction adjusting method based on stepless adjustment of eccentric block |
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| CN202011321978.XA CN112718061B (en) | 2020-11-23 | 2020-11-23 | Single-cylinder cone crusher vibration reduction adjusting method based on stepless adjustment of eccentric block |
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| CN112718061B true CN112718061B (en) | 2022-03-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2714149Y (en) * | 2004-08-10 | 2005-08-03 | 张春 | Cone crusher |
| CN203264773U (en) * | 2013-05-28 | 2013-11-06 | 成都大宏立机器股份有限公司 | Centrifugal force adjustment device |
| CN203264772U (en) * | 2013-05-28 | 2013-11-06 | 成都大宏立机器股份有限公司 | Inertia cone crusher eccentric balancing structure |
| CN111774132A (en) * | 2020-07-28 | 2020-10-16 | 南昌矿山机械有限公司 | Eccentric assembly of multi-cylinder hydraulic cone crusher |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201023973A (en) * | 2009-12-30 | 2010-07-01 | Gong-Qi Fan | Shock-type conical crusher |
| US9238228B2 (en) * | 2011-04-13 | 2016-01-19 | Metso Minerals, Inc. | Cone crusher and processing plant for mineral material |
| KR101191267B1 (en) * | 2011-04-14 | 2012-10-16 | 하용간 | Cone type crusher |
-
2020
- 2020-11-23 CN CN202011321978.XA patent/CN112718061B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2714149Y (en) * | 2004-08-10 | 2005-08-03 | 张春 | Cone crusher |
| CN203264773U (en) * | 2013-05-28 | 2013-11-06 | 成都大宏立机器股份有限公司 | Centrifugal force adjustment device |
| CN203264772U (en) * | 2013-05-28 | 2013-11-06 | 成都大宏立机器股份有限公司 | Inertia cone crusher eccentric balancing structure |
| CN111774132A (en) * | 2020-07-28 | 2020-10-16 | 南昌矿山机械有限公司 | Eccentric assembly of multi-cylinder hydraulic cone crusher |
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Address after: 330004 No. 300, Hongwan Avenue, Wanli District, Nanchang City, Jiangxi Province Patentee after: Nanchang Mining Machinery Group Co.,Ltd. Address before: 330004 No. 300, Hongwan Avenue, Wanli District, Nanchang City, Jiangxi Province Patentee before: NANCHANG MINERAL SYSTEMS Co.,Ltd. |
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