CN110142086B - Material crushing and grinding machine and using method thereof - Google Patents
Material crushing and grinding machine and using method thereof Download PDFInfo
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- CN110142086B CN110142086B CN201910434195.3A CN201910434195A CN110142086B CN 110142086 B CN110142086 B CN 110142086B CN 201910434195 A CN201910434195 A CN 201910434195A CN 110142086 B CN110142086 B CN 110142086B
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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
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
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Abstract
The invention relates to a material crushing and grinding machine and a using method thereof, and the material crushing and grinding machine comprises a bottom plate, a variable speed driving module, a fixed outer pipe, two U-shaped frames, two rotating shafts, two circular plates and a built-in grinding roller, wherein the fixed outer pipe is installed at the upper end of the bottom plate, the two rotating shafts are installed at the left end and the right end of the fixed outer pipe through bearings, the inner ends of the rotating shafts are installed on the circular plates, the outer ends of the rotating shafts are installed on the U-shaped frames through bearings, the U-shaped frames are installed on the bottom plate, the built-in grinding roller is evenly installed between the. The invention can solve the problems that materials with different volumes can be mixed together to form a material layer in the existing grinding process, the materials with larger volumes can be buried at deeper positions in the grinding process, the fine materials on the upper surface of the material layer play a role in reducing the impact force on the falling grinding body in the falling and smashing process of the grinding body, the grinding body has weight, the surface of a grinding cavity can be smashed to be concave in the falling process, and the like.
Description
Technical Field
The invention relates to the field of grinding mills, in particular to a material grinding mill and a using method thereof.
Background
The grinding machine is a device for crushing materials, is usually used in the production industries of cement, refractory materials, chemical fertilizers, black and non-ferrous metal ore dressing, glass ceramics and the like due to higher crushing rate, and the existing grinding machine generally puts the materials into a grinding cavity and crushes the materials by a grinding body, but the following problems can occur in the grinding process:
1. materials with different volumes can be mixed together to form a material layer, when the materials with larger volumes are ground, the materials with larger volumes can be buried at deeper positions, in the falling and crushing process of the grinding body, the fine and broken materials on the upper surface of the material layer play a role in reducing the impact force on the falling grinding body, and the grinding body is difficult to substantially crush the materials buried at the deep positions; 2. the grinding body has certain weight, and the surface of the grinding cavity can be smashed to be sunken when falling, so that the service life of the grinding cavity is shortened.
Disclosure of Invention
Technical problem to be solved
The invention can solve the problems that materials with different volumes can be mixed together to form a material layer in the existing grinding process, the materials with larger volumes can be buried in deeper positions in the grinding process, the fine crushed materials on the upper surface of the material layer play a role in reducing the impact force on the falling grinding body in the falling and crushing process of the grinding body, the grinding body is difficult to substantially crush the materials buried in the depth, the grinding body has certain weight, the surface of a grinding cavity can be crushed to be sunken in the falling process, the service life of the grinding cavity is shortened, and the like.
(II) technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a material crushing grinds machine, includes bottom plate, variable speed drive module, fixed outer tube, two U type framves, two pivots, two plectanes and built-in grinding roller, the upper end of bottom plate install fixed outer tube, two pivots are installed through the bearing in both ends about fixed outer tube, the inner of pivot is installed on the plectane, the outer end of pivot is passed through the bearing and is installed on U type frame, U type frame is installed on the bottom plate, evenly installs built-in grinding roller through the round pin axle between two plectanes, variable speed drive module is installed to the left end of bottom plate.
The variable speed driving module comprises a main motor, a main gear and an auxiliary gear, wherein the main motor is installed on the bottom plate through a base, the main gear is installed on an output shaft of the main motor, the main gear is meshed with the auxiliary gear, the auxiliary gear is installed on a rotating shaft located at the left end of the built-in grinding roller, the diameter of the main gear is larger than that of the auxiliary gear, the main motor drives the main gear to rotate during specific work, and the auxiliary gear drives the two circular plates to move at a high speed due to the fact that the specifications of the main gear and the auxiliary gear are different.
Fixed outer tube include two support frames, two connection pads, grind outer tube and two locking mechanism, two support frames are installed at the bottom plate both ends of controlling, the fixed cover in upper end of support frame is equipped with the connection pad, install the outer tube of grinding between two connection pads, the upper end of grinding the outer tube is equipped with two feed tanks, install locking mechanism in the feed tank, concrete during operation, two locking mechanism play the effect that opens and shuts to two feed tanks, during the grinding, grind the outer tube and keep motionless, grind the inside built-in grinding roller of outer tube and rotate, form the effect of grinding.
The built-in grinding roller comprises a middle column, two sleeves, a resisting plate and a contact block, wherein the two sleeves are sleeved at the left end and the right end of the middle column, the contact block is symmetrically arranged in the middle of the middle column, the resisting plate is uniformly arranged in the grinding outer pipe, when the middle column rotates, the contact block blocks the resisting plate, the middle column rotates reversely, and when the circular plate drives the built-in grinding roller to rotate integrally, each built-in grinding roller rotates irregularly, so that materials can be ground between two adjacent built-in grinding rollers.
Preferably, an inner cavity is arranged in the grinding outer tube, the inner cavity is in a cam shape, a gap between the inner cavity and the outer wall of the built-in grinding roller is gradually reduced from top to bottom, and a first grinding wheel layer is arranged on the wall of the inner cavity.
Preferably, the lower end of the grinding outer pipe is provided with a discharge port, a plugging block is arranged in the discharge port, and the upper end of the plugging block is provided with a frosted layer.
Preferably, locking mechanism include lock sleeve, lock core, locking piece and sealed push pedal, sealed push pedal links to each other with the feed chute through sliding fit's mode, the locking piece is installed to the upper end of sealed push pedal, installs the lock sleeve on grinding outer tube upper end outer wall, installs the lock core through the round pin axle on the lock sleeve.
Preferably, the lock block is provided with an open slot, the lock sleeve is internally provided with an inlet slot, and the front end of the lock core is provided with a handle.
Preferably, an annular cavity is formed between the inner wall of the sleeve and the outer wall of the middle column, and rolling steel balls are arranged in the annular cavity.
Preferably, the outer wall of the sleeve is provided with a second grinding wheel layer, the contact block is of a triangular structure, and the inclined surface of the contact block is in contact with the abutting plate.
Preferably, the contact block is arranged on the same axis with the sleeve, and the distance from the top end of the contact block to the axis is smaller than the radius of the sleeve.
In addition, the invention also provides a use method of the material crushing and grinding machine, which is characterized by comprising the following steps:
s1, feeding: conveying materials into the feeding groove;
s2, closing the sealing push plate: after all the materials enter, the sealing push plate is closed, the locking block enters the groove, and the lock cylinder is clamped into the open groove to lock the sealing push plate;
s3, motor operation: the main motor drives the main gear to rotate, and the diameter of the main gear is larger than that of the auxiliary gear, so that the rotating speed of the auxiliary gear is increased, and the auxiliary gear drives the two circular plates to move at a high speed;
s4, grinding materials: after the material falls on the upper end of the inner part of the grinding outer pipe, the circular plate drives the built-in grinding rollers to integrally rotate, the material is ground between the inner wall of the grinding outer pipe and the outer wall of the built-in grinding rollers in a rotating state, and after the volume of the material is reduced, the material can fall into a next layer from a gap between two adjacent built-in grinding rollers or between the grinding outer pipe and the built-in grinding rollers, and the material is repeatedly ground until the material completely falls on the bottom end of the inner part of the grinding outer pipe;
s5, in the grinding process: when the circular plate drives the built-in grinding rollers to integrally rotate, the rolling steel balls roll in the annular cavity in the centrifugal force direction under the influence of partial centrifugal force, and meanwhile, the rolling steel balls are influenced by partial gravity to fall back to the lower end of the annular cavity and move in the annular cavity within a small range, so that each built-in grinding roller rotates in an irregular small range;
s6, finishing grinding: open the jam piece, carry away the material after will grinding from the discharge gate, personnel use current collection frame to collect.
(III) advantageous effects
1. According to the material crushing grinder, materials are ground layer by adopting a design concept of stepped screening, and materials with different volumes are ground at different positions in the grinding outer tube, so that the condition that part of the materials with larger volumes are buried in the material layer to a depth and are difficult to grind is avoided, and the grinding rate is improved;
2. according to the material crushing and grinding machine, the built-in grinding rollers rotate inside the grinding outer pipe, the condition that the inner surface of the grinding outer pipe is damaged is avoided, the service life of the grinding outer pipe is prolonged, and the single built-in grinding roller rotates irregularly in a small range, so that materials can be ground by the adjacent built-in grinding rollers.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the present invention between the rotating shaft, circular plate, middle column, sleeve and contact block;
FIG. 3 is a cross-sectional view A-A of FIG. 1 of the present invention;
FIG. 4 is a cross-sectional view B-B of FIG. 1 of the present invention;
FIG. 5 is a schematic diagram of the operation of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. In this process, the width of the lines or the size of the components in the drawings may be exaggerated for clarity and convenience of description.
The following terms are defined based on the functions of the present invention, and may be different depending on the intention of the user or the operator or the convention. Therefore, these terms are defined based on the entire contents of the present specification.
As shown in fig. 1 to 5, a material crushing grinder comprises a bottom plate 1, a variable speed driving module 2, a fixed outer tube 3, two U-shaped frames 4, two rotating shafts 5, two circular plates 6 and a built-in grinding roller 7, wherein the fixed outer tube 3 is installed at the upper end of the bottom plate 1, the two rotating shafts 5 are installed at the left end and the right end of the fixed outer tube 3 through bearings, the inner ends of the rotating shafts 5 are installed on the circular plates 6, the outer ends of the rotating shafts 5 are installed on the U-shaped frames 4 through bearings, the U-shaped frames 4 are installed on the bottom plate 1, the built-in grinding roller 7 is evenly installed between the two circular plates 6 through pin shafts, and the variable speed driving module 2.
Fixed outer tube 3 include two support frames 31, two connection pads 32, grind outer tube 33 and two locking mechanism 34, both ends about bottom plate 1 are installed to two support frames 31, the fixed cover in upper end of support frame 31 is equipped with connection pad 32, install between two connection pads 32 and grind outer tube 33, the upper end of grinding outer tube 33 is equipped with two feed chutes, install locking mechanism 34 in the feed chute, concrete during operation, two locking mechanism 34 play the effect that opens and shuts to two feed chutes, during the grinding, grind outer tube 33 and keep motionless, grind the inside built-in grinding roller 7 of outer tube 33 and rotate, form the effect of grinding.
Grinding outer tube 33 in be equipped with the inner chamber, the inner chamber is the cam shape, the clearance of inner chamber and built-in grinding roller 7 outer wall down reduces gradually from last for great material gets into the back from the feed chute, grinds the back for a period, the volume diminishes the back, carries downwards, and great bulky material remains in this aspect, presents the cascaded grinding effect of having guaranteed the material that sets up, is equipped with a emery wheel layer on the inner chamber wall, has increased frictional force, has improved the effect.
The lower extreme of grinding outer tube 33 be equipped with the discharge gate, be equipped with the jam piece in the discharge gate, the material after the grinding can be carried away from the discharge gate, the upper end of jam piece is equipped with the dull polish layer, avoids not producing the effect of grinding between the up end of built-in grinding roller 7 and jam piece.
The locking mechanism 34 include lock sleeve 341, lock core 342, locking piece 343 and sealed push pedal 344, sealed push pedal 344 links to each other with the feed chute through sliding fit's mode, the locking piece 343 is installed to the upper end of sealed push pedal 344, install lock sleeve 341 on the outer wall of grinding outer tube 33 upper end, install lock core 342 through the round pin axle on the lock sleeve 341, during specific work, the material is whole to get into the back, closes sealed push pedal 344, the locking piece 343 gets into lock sleeve 341, lock core 342 card is gone into locking piece 343 and is locked.
The lock block 343 is provided with an open slot, the lock sleeve 341 is internally provided with an inlet slot, the front end of the lock cylinder 342 is provided with a handle, after the sealing push plate 344 is closed, the lock block 343 enters the inlet slot, and the lock cylinder 342 is clamped into the open slot to lock the sealing push plate 344.
The speed change driving module 2 comprises a main motor 21, a main gear 22 and an auxiliary gear 23, wherein the main motor 21 is installed on the bottom plate 1 through a base, the main gear 22 is installed on an output shaft of the main motor 21, the auxiliary gear 23 is meshed with the main gear 22, the auxiliary gear 23 is installed on a rotating shaft 5 located at the left end of the built-in grinding roller 7, the diameter of the main gear 22 is larger than that of the auxiliary gear 23, the structural characteristics, the working principle and the control method of the main motor 21 are the prior art, during specific work, the main motor 21 drives the main gear 22 to rotate, and the auxiliary gear 23 drives the two circular plates 6 to move at high speed due to the fact that the specifications of the main gear 22 and the auxiliary gear 23 are different.
The built-in grinding rollers 7 comprise a middle column 71, two sleeves 72, a resisting plate 74 and a contact block 75, the two sleeves 72 are sleeved at the left end and the right end of the middle column 71, the contact block 75 is symmetrically arranged in the middle of the middle column 71, the resisting plate 74 is uniformly arranged in the grinding outer tube 33, when the built-in grinding rollers work in detail, when the middle column 71 rotates, after the contact block 75 blocks the resisting plate 74, the middle column 71 rotates reversely, so that when the circular plate 6 drives the built-in grinding rollers 7 to rotate integrally, each built-in grinding roller 7 rotates irregularly, and materials can be ground between two adjacent built-in grinding rollers 7.
An annular cavity is formed between the inner wall of the sleeve 72 and the outer wall of the intermediate column 71, rolling steel balls are arranged in the annular cavity, after the circular plate 6 drives the built-in grinding rollers 7 to integrally rotate, the rolling steel balls roll outwards in the annular cavity under the influence of partial centrifugal force to drive the independent built-in grinding rollers 7 to rotate in a small range, meanwhile, the rolling steel balls fall back to the lower end of the annular cavity under the influence of partial gravity, and each built-in grinding roller 7 rotates in an irregular small range.
The outer wall of the sleeve 72 is provided with a second grinding wheel layer, materials are ground between the outer wall of the sleeve 72 and the inner wall of the grinding outer tube 33, the contact block 75 is of a triangular structure, the inclined surface of the contact block 75 is in contact with the abutting plate 74, and difficulty in reverse rotation after the sleeve 72 is blocked is reduced.
The contact blocks 75 and the sleeve 72 are arranged on the same axis, and the distance from the top ends of the contact blocks 75 to the axis is smaller than the radius of the sleeve 72, so that the condition that two adjacent contact blocks 75 collide when two adjacent built-in grinding rollers 7 rotate is avoided.
In addition, the invention also provides a use method of the material crushing and grinding machine, which is characterized by comprising the following steps:
s1, feeding: conveying materials into the feeding groove;
s2, closing the sealing push plate 344: after all the materials enter, the sealing push plate 344 is closed, the locking block 343 enters the groove, and the lock cylinder 342 is clamped into the open groove to lock the sealing push plate 344;
s3, motor operation: the main motor 21 drives the main gear 22 to rotate, and the diameter of the main gear 22 is larger than that of the auxiliary gear 23, so that the rotating speed of the auxiliary gear 23 is increased, and the auxiliary gear 23 drives the two circular plates 6 to move at a high speed;
s4, grinding materials: after the materials fall on the upper end inside the grinding outer pipe 33, the circular plate 6 drives the built-in grinding rollers 7 to integrally rotate, the materials are ground between the inner wall of the grinding outer pipe 33 and the outer wall of the built-in grinding rollers 7 in a rotating state, after the volume of the materials is reduced, the materials can fall into a next layer from the gap between two adjacent built-in grinding rollers 7 or the gap between the grinding outer pipe 33 and the built-in grinding rollers 7, and the grinding is repeated until the materials completely fall on the bottom end inside the grinding outer pipe 33;
s5, in the grinding process: when the circular plate 6 drives the built-in grinding rollers 7 to integrally rotate, the rolling steel balls roll in the annular cavity in the direction of centrifugal force due to the influence of partial centrifugal force, and meanwhile, the rolling steel balls are influenced by partial gravity to fall back to the lower end of the annular cavity and move in the annular cavity within a small range, so that each built-in grinding roller 7 rotates in an irregular small range;
s6, finishing grinding: open the jam piece, carry away the material after will grinding from the discharge gate, personnel use current collection frame to collect.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a material crushing grinds machine, includes bottom plate (1), variable speed drive module (2), fixed outer tube (3), two U type framves (4), two pivot (5), two plectanes (6) and built-in grinding roller (7), its characterized in that: the grinding device is characterized in that a fixed outer tube (3) is mounted at the upper end of the bottom plate (1), two rotating shafts (5) are mounted at the left end and the right end of the fixed outer tube (3) through bearings, the inner ends of the rotating shafts (5) are mounted on circular plates (6), the outer ends of the rotating shafts (5) are mounted on a U-shaped frame (4) through bearings, the U-shaped frame (4) is mounted on the bottom plate (1), built-in grinding rollers (7) are uniformly mounted between the two circular plates (6) through pin shafts, and a variable speed driving module (2) is mounted at the left end of the bottom plate;
the variable-speed driving module (2) comprises a main motor (21), a main gear (22) and a slave gear (23), the main motor (21) is installed on the bottom plate (1) through a base, the main gear (22) is installed on an output shaft of the main motor (21), the slave gear (23) is meshed on the main gear (22), the slave gear (23) is installed on a rotating shaft (5) located at the left end of the built-in grinding roller (7), and the diameter of the main gear (22) is larger than that of the slave gear (23);
the fixed outer tube (3) comprises two support frames (31), two connecting discs (32), a grinding outer tube (33) and two locking mechanisms (34), the two support frames (31) are installed at the left end and the right end of the bottom plate (1), the connecting discs (32) are fixedly sleeved at the upper ends of the support frames (31), the grinding outer tube (33) is installed between the two connecting discs (32), two feeding grooves are formed in the upper ends of the grinding outer tube (33), and the locking mechanisms (34) are installed in the feeding grooves;
the built-in grinding roller (7) comprises a middle column (71), two sleeves (72), a resisting plate (74) and a contact block (75), the two sleeves (72) are sleeved at the left end and the right end of the middle column (71), the contact block (75) is symmetrically arranged in the middle of the middle column (71), and the resisting plate (74) is uniformly arranged in the grinding outer tube (33);
an annular cavity is formed between the inner wall of the sleeve (72) and the outer wall of the middle column (71), and rolling steel balls are arranged in the annular cavity.
2. The material crushing mill of claim 1, wherein: an inner cavity is arranged in the grinding outer tube (33), the inner cavity is in a cam shape, the gap between the inner cavity and the outer wall of the built-in grinding roller (7) is gradually reduced from top to bottom, and a first grinding wheel layer is arranged on the wall of the inner cavity.
3. The material crushing mill of claim 1, wherein: the lower end of the grinding outer pipe (33) is provided with a discharge hole, a plugging block is arranged in the discharge hole, and the upper end of the plugging block is provided with a frosting layer.
4. A material crushing mill according to claim 3, characterized in that: locking mechanism (34) include lock sleeve (341), lock core (342), locking piece (343) and sealed push pedal (344), sealed push pedal (344) link to each other with the feed chute through sliding fit's mode, locking piece (343) are installed to the upper end of sealed push pedal (344), install lock sleeve (341) on grinding outer tube (33) upper end outer wall, install lock core (342) through the round pin axle on lock sleeve (341).
5. The material crushing mill according to claim 4, characterized in that: the lock is characterized in that an open slot is formed in the lock block (343), an inlet slot is formed in the lock sleeve (341), and a handle is arranged at the front end of the lock cylinder (342).
6. The material crushing mill of claim 1, wherein: the outer wall of the sleeve (72) is provided with a second grinding wheel layer, the contact block (75) is of a triangular structure, and the inclined surface of the contact block (75) is in contact with the abutting plate (74).
7. The material crushing mill of claim 1, wherein: the contact block (75) and the sleeve (72) are arranged on the same axis, and the distance from the top end of the contact block (75) to the axis is smaller than the radius of the sleeve (72).
8. The method of using a pulverizer mill according to claim 5, comprising the steps of:
s1, feeding: conveying materials into the feeding groove;
s2, closing the sealing push plate (344): after all the materials enter, the sealing push plate (344) is closed, the locking block (343) enters the groove, and the lock cylinder (342) is clamped into the open groove to lock the sealing push plate (344);
s3, motor operation: the main motor (21) drives the main gear (22) to rotate, and the diameter of the main gear (22) is larger than that of the auxiliary gear (23), so that the rotating speed of the auxiliary gear (23) is increased, and the auxiliary gear (23) drives the two circular plates (6) to move at a high speed;
s4, grinding materials: after the materials fall on the upper end of the inner part of the grinding outer pipe (33), the circular plate (6) drives the built-in grinding roller (7) to integrally rotate, the materials are ground between the inner wall of the grinding outer pipe (33) and the outer wall of the built-in grinding roller (7) in a rotating state, when the volume of the materials is reduced, the materials can fall into a next layer from the gap between two adjacent built-in grinding rollers (7) or the gap between the grinding outer pipe (33) and the built-in grinding roller (7), and the materials are repeatedly ground until the materials completely fall on the bottom end of the inner part of the grinding outer pipe (33);
s5, in the grinding process: when the circular plate (6) drives the built-in grinding rollers (7) to integrally rotate, the rolling steel balls roll in the annular cavity in the centrifugal force direction under the influence of partial centrifugal force, and meanwhile, the rolling steel balls are influenced by partial gravity to fall back to the lower end of the annular cavity and move in the annular cavity within a small range, so that each built-in grinding roller (7) rotates in an irregular small range;
s6, finishing grinding: open the jam piece, carry away the material after will grinding from the discharge gate, personnel use current collection frame to collect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910434195.3A CN110142086B (en) | 2019-05-23 | 2019-05-23 | Material crushing and grinding machine and using method thereof |
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| CN201910434195.3A CN110142086B (en) | 2019-05-23 | 2019-05-23 | Material crushing and grinding machine and using method thereof |
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| CN112007718A (en) * | 2020-08-13 | 2020-12-01 | 苏州斯尔斯特新材料科技有限公司 | Crushing device for solid food detection |
| CN113600273B (en) * | 2021-08-09 | 2022-06-17 | 湖南省新化县鑫星电子陶瓷有限责任公司 | Grind machine of ceramic raw materials |
| CN117900007B (en) * | 2024-03-19 | 2024-05-28 | 山东华信工业科技有限公司 | Superfine grinding device for silicon carbide micropowder |
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| DE10016388C2 (en) * | 2000-04-01 | 2003-04-10 | Fauner Gerhard | Grinding device and method for the production of fine flour particles in the nanometer range |
| CN105665085A (en) * | 2016-01-21 | 2016-06-15 | 宁国市南方耐磨材料有限公司 | Combined grinding ball |
| CN206723625U (en) * | 2017-04-17 | 2017-12-08 | 中铁十四局集团第二工程有限公司 | A kind of vibratile Grouting Pipe mouth of pipe |
| CN108144700A (en) * | 2018-02-11 | 2018-06-12 | 江西亿丰精密铸造有限公司 | A kind of coating material production abrasive roller |
| CN208865755U (en) * | 2018-09-14 | 2019-05-17 | 惠阳 | A kind of nano ceramics manufacturing equipment of screening function |
| KR101964939B1 (en) * | 2018-10-01 | 2019-04-02 | 동부이엔티 주식회사 | a trommel of improved type |
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