CN112844554A - Ore crushing and screening machine - Google Patents
Ore crushing and screening machine Download PDFInfo
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- CN112844554A CN112844554A CN202011561011.9A CN202011561011A CN112844554A CN 112844554 A CN112844554 A CN 112844554A CN 202011561011 A CN202011561011 A CN 202011561011A CN 112844554 A CN112844554 A CN 112844554A
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- rotating cylinder
- wave
- crushing
- sliding groove
- machine body
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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
- B02C2/10—Crushing or disintegrating by gyratory or cone crushers concentrically moved; Bell crushers
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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
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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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
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
- B02C7/08—Crushing or disintegrating by disc mills with coaxial discs with vertical axis
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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
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
- B02C7/12—Shape or construction of discs
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention discloses an ore crushing and screening machine, and particularly relates to the technical field of ore processing, which comprises a machine body, wherein a rotating mechanism is arranged in the middle of the machine body, the rotating mechanism comprises an outer rotating cylinder, an inner wave-shaped sliding groove is formed in the inner side wall of the outer rotating cylinder, an inner rotating cylinder is arranged in the middle of the inner side of the outer rotating cylinder, an outer wave-shaped sliding groove is formed in the outer side wall of the inner rotating cylinder, a U-shaped frame is arranged between the outer rotating cylinder and the inner rotating cylinder, and sliding sleeves are movably sleeved on two sides of the U-shaped frame. According to the invention, through the arrangement of the machine body, the rotating mechanism, the crushing cone, the lower shearing disc, the upper shearing disc, the sieve plate and the motor, in the rotating process of the outer rotating drum, the inner rotating drum, the crushing cone and the upper shearing disc, larger ores can be sheared, the crushing difficulty is reduced, the ores can be crushed twice, the crushing effect is improved, and meanwhile, the sieve plate is driven to move up and down through the sliding sleeve and the connecting rod, so that the sieving of the ores can be accelerated, and the efficiency is improved.
Description
Technical Field
The invention relates to the technical field of ore processing, in particular to an ore crushing and screening machine.
Background
The ore is a process of breaking large ore blocks by overcoming internal intermolecular force and breaking the ore blocks by the action of the external force of a breaker and gradually reducing the granularity of the ore blocks.
However, the existing ore crushing and screening machine has the defects of insufficient crushing, difficulty in crushing due to overlarge stone materials, repeated crushing treatment for completion and easiness in damaging equipment.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the above defects in the prior art, an embodiment of the present invention provides an ore crushing and screening machine, and the technical problems to be solved by the present invention are: the existing ore crushing and screening machine has the defects of insufficient crushing, difficulty in crushing due to overlarge stone materials, repeated crushing treatment for completing the crushing, and easiness in damaging equipment.
In order to achieve the purpose, the invention provides the following technical scheme: an ore crushing and screening machine comprises a machine body, wherein a rotating mechanism is arranged in the middle of the machine body and comprises an outer rotating cylinder, an inner corrugated sliding groove is formed in the inner side wall of the outer rotating cylinder, an inner rotating cylinder is arranged in the middle of the inner side of the outer rotating cylinder, an outer corrugated sliding groove is formed in the outer side wall of the inner rotating cylinder, a U-shaped frame is arranged between the outer rotating cylinder and the inner rotating cylinder, sliding sleeves are movably sleeved on two sides of the U-shaped frame, two ends of each sliding sleeve respectively extend to the inner sides of the inner corrugated sliding groove and the outer corrugated sliding groove and respectively slide on the inner sides of the inner corrugated sliding groove and the outer corrugated sliding groove, connecting rods are fixedly connected to the bottom ends of the two sliding sleeves, a solid shaft is fixedly connected to the middle of the inner rotating cylinder, a hollow shaft is movably sleeved on the outer side of the upper portion of the solid shaft, the front end and the rear end of the support are fixedly connected with the inner side wall of the machine body, the middle part of the bottom end of the U-shaped frame is fixedly inserted in the middle part of the support, the upper end of the outer rotary drum is fixedly connected with a crushing cone, a first crushing cavity is arranged between the machine body and the crushing cone, and a second crushing cavity is arranged between the machine body and the outer rotary drum;
the top of broken awl is equipped with down and cuts the dish, cut dish and organism fixed connection down, the middle part of cutting the dish down rotates with the upper end of hollow shaft to be connected, the top of cutting the dish down is equipped with cuts the dish, the middle part and the solid axle fixed connection of cutting the dish on, the upper surface of cutting the dish down and the lower surface laminating of last shearing dish, cut the dish down and cut the hole under and cut the hole with last on cutting the dish respectively with last, the below slope of U-shaped frame is provided with the sieve, the lateral wall of sieve and the inside wall laminating of organism, two the bottom of connecting rod is pegged graft with the both sides of sieve are fixed respectively, the upper end fixed mounting of organism has the motor, the output shaft of motor and the upper end fixed connection of solid axle, the discharge gate has been seted up to one side of organism bottom.
In a preferred embodiment, the outer side walls of the crushing cone and the outer rotor are fixedly connected with protrusions.
In a preferred embodiment, bearings are installed at two ends of the sliding sleeve, and the two ends of the sliding sleeve respectively slide inside the inner wave-shaped sliding groove and the outer wave-shaped sliding groove through the bearings.
In a preferred embodiment, the inner and outer wave shaped chutes have the same number of peaks and valleys and equal amplitudes.
In a preferred embodiment, the lower and upper shear discs are both concave.
In a preferred embodiment, the solid shaft and the hollow shaft are movable through the upper end of the crushing cone.
In a preferred embodiment, a guide plate is fixedly installed on the inner side of the bottom of the machine body.
In a preferred embodiment, a spiral material lifting machine is fixedly mounted on the outer side of the machine body, a feed port at the bottom end of the spiral material lifting machine is communicated with the inner side of the bottom of the machine body, and a discharge port at the upper end of the spiral material lifting machine is communicated with the inside of the first crushing cavity.
The invention has the technical effects and advantages that:
1. according to the invention, through the arrangement of the machine body, the rotating mechanism, the crushing cone, the lower shearing disc, the upper shearing disc, the sieve plate and the motor, in the rotating process of the outer rotating drum, the inner rotating drum, the crushing cone and the upper shearing disc, not only can relatively large ores be sheared and the crushing difficulty be reduced, but also the ores can be crushed twice, so that the crushing effect is improved, and meanwhile, the sieve plate is driven to move up and down through the sliding sleeve and the connecting rod, so that the sieving of the ores can be accelerated, and the efficiency is improved;
2. according to the invention, through shearing and twice crushing of the ore, the crushing is more thorough, and the larger ore is sheared into small blocks before the crushing, so that the crushing efficiency can be improved, and the equipment is prevented from being greatly damaged.
Drawings
Fig. 1 is a schematic view of the external structure of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic structural diagram of the rotating mechanism of the present invention.
Fig. 4 is a schematic structural view of the outer rotary drum of the present invention.
FIG. 5 is a schematic view of the structure of the inner drum of the present invention.
FIG. 6 is a schematic view of the U-shaped frame of the present invention.
Fig. 7 is a schematic view of the construction of the lower shear disk and the upper shear disk of the present invention.
The reference signs are:
the crushing device comprises a machine body 1, a first crushing cavity 11, a second crushing cavity 12, a rotating mechanism 2, an outer rotary drum 21, an inner corrugated sliding groove 211, an inner rotary drum 22, an outer corrugated sliding groove 221, a U-shaped frame 23, a sliding sleeve 24, a connecting rod 25, a solid shaft 26, a hollow shaft 27, a bearing 28, a support 3, a crushing cone 4, a lower shearing disc 5, a lower shearing hole 51, an upper shearing disc 52, an upper shearing hole 53, a sieve plate 6, a motor 7, a discharge hole 8, a guide plate 9 and a spiral material lifting machine 100.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The invention provides an ore crushing and screening machine, which comprises a machine body 1, wherein a rotating mechanism 2 is arranged in the middle of the machine body 1, the rotating mechanism 2 comprises an outer rotary drum 21, an inner wave-shaped sliding groove 211 is formed in the inner side wall of the outer rotary drum 21, an inner rotary drum 22 is arranged in the middle of the inner side of the outer rotary drum 21, an outer wave-shaped sliding groove 221 is formed in the outer side wall of the inner rotary drum 22, a U-shaped frame 23 is arranged between the outer rotary drum 21 and the inner rotary drum 22, sliding sleeves 24 are movably sleeved on two sides of the U-shaped frame 23, two ends of each sliding sleeve 24 respectively extend to the inner sides of the inner wave-shaped sliding groove 211 and the outer wave-shaped sliding groove 221 and respectively slide on the inner sides of the inner wave-shaped sliding groove 211 and the outer wave-shaped sliding groove 221, connecting rods 25 are fixedly connected to the bottom ends of the two sliding sleeves 24, a, the bottom end of the hollow shaft 27 is rotatably connected with the upper end of the outer rotating cylinder 21, a support 3 is arranged below the U-shaped frame 23, the front end and the rear end of the support 3 are fixedly connected with the inner side wall of the machine body 1, the middle part of the bottom end of the U-shaped frame 23 is fixedly inserted in the middle of the support 3, the upper end of the outer rotating cylinder 21 is fixedly connected with a crushing cone 4, a first crushing cavity 11 is arranged between the machine body 1 and the crushing cone 4, and a second crushing cavity 12 is arranged between the machine body 1 and the outer rotating cylinder 21;
a lower shearing disc 5 is arranged above the crushing cone 4, the lower shearing disc 5 is fixedly connected with the machine body 1, the middle part of the lower shearing disc 5 is rotationally connected with the upper end of the hollow shaft 27, an upper shearing disc 52 is arranged above the lower shearing disc 5, the middle part of the upper shearing disc 52 is fixedly connected with the solid shaft 26, the upper surface of the lower shearing disc 5 is attached to the lower surface of the upper shearing disc 52, the lower shearing disc 5 and the upper shearing disc 52 are respectively provided with a plurality of lower shearing holes 51 and upper shearing holes 53, the sieve plate 6 is obliquely arranged below the U-shaped frame 23, the side wall of the sieve plate 6 is attached to the inner side wall of the machine body 1, the bottom ends of the two connecting rods 25 are fixedly inserted with the two sides of the sieve plate 6 respectively, the upper end of the machine body 1 is fixedly provided with a motor 7, an output shaft of the motor 7 is fixedly connected with the upper end of the solid shaft 26, and one side of the bottom end of the machine body 1 is provided with a discharge hole 8.
The outer side walls of the crushing cone 4 and the outer rotary drum 21 are both fixedly connected with bulges.
The inner and outer wave shaped chutes 211 and 221 have the same number of peaks and valleys and have the same amplitude.
Both the lower shear disc 5 and the upper shear disc 52 are concave.
The solid shaft 26 and the hollow shaft 27 are movably passed through the upper end of the crushing cone 4.
A guide plate 9 is fixedly arranged on the inner side of the bottom of the machine body 1.
The outside fixed mounting of organism 1 has spiral material lifting machine 100, the feed inlet of spiral material lifting machine 100 bottom communicates with the inboard of organism 1 bottom, the discharge gate of spiral material lifting machine 100 upper end and the inside intercommunication in first broken chamber 11.
As shown in fig. 1 to 7, the embodiment specifically is as follows: in use, the motor 7 is started, the motor 7 drives the solid shaft 26 to rotate, the solid shaft 26 can drive the upper shearing disk 52 to rotate, the lower shearing disk 5 is kept static, meanwhile, the solid shaft 26 can drive the inner rotary drum 22 to rotate, when the inner drum 22 rotates, one end of the sliding sleeve 24 can slide along the inner side of the outer wave shaped sliding groove 221 relative to the outer wave shaped sliding groove 221, so that the sliding sleeve 24 can move up and down along the U-shaped frame 23 due to the guiding function of the U-shaped frame 23, during the process that the sliding sleeve 24 moves up and down along the U-shaped frame 23, the other end slides along the inside of the inner wave guide 211 with respect to the inner wave guide 211, thereby the outer rotary drum 21 can be driven to rotate by the inner wave-shaped chute 211, the outer rotary drum 21 can drive the crushing cone 4 to rotate, at the moment, the two sliding sleeves 24 can drive the two connecting rods 25 to move up and down, and the sieve plate 6 can be driven to move up and down through the two connecting rods 25;
that is, the motor 7 can drive the outer rotary drum 21, the inner rotary drum 22, the crushing cone 4 and the upper shearing disc 52 to rotate, and the sliding sleeve 24 and the connecting rod 25 can drive the sieve plate 6 to move up and down by moving up and down;
ore is put in from the upper end of the machine body 1, the ore falls through the upper shearing holes 53 on the upper shearing disc 52 and the lower shearing holes 51 on the lower shearing disc 5, and the lower shearing disc 5 is kept still while the upper shearing disc 52 rotates, so that the ore can be sheared through the lower shearing holes 51 and the upper shearing holes 53 in the falling process, and larger ore can be cut;
then the ore falls into the first crushing cavity 11 and continues to fall, and at the moment, the ore can be crushed for one time through the extrusion of the crushing cone 4 and the side wall of the machine body 1 and the protrusion of the outer side wall of the crushing cone 4;
then the ore falls into the second crushing cavity 12 and continues to fall, and at the moment, the ore can be secondarily crushed through the extrusion of the outer rotary drum 21 and the side wall of the machine body 1 and the protrusion of the outer side wall of the outer rotary drum 21;
then the ore falls above the sieve plate 6 for sieving, and the sieve plate 6 is driven to move up and down through the two connecting rods 25, so that the vibrating effect can be achieved, and the purpose of accelerating sieving is achieved;
finally, the screened ore flows out of a discharge port 8 through a guide plate 9;
if larger ores still exist, the ores can enter the spiral material lifting machine 100 when the sieve plate 6 moves to the lowest end, and are lifted to the inside of the first crushing cavity 11 by the spiral material lifting machine 100 to be crushed again;
through the arrangement of the machine body 1, the rotating mechanism 2, the crushing cone 4, the lower shearing disc 5, the upper shearing disc 52, the sieve plate 6 and the motor 7, in the rotating process of the outer rotating cylinder 21, the inner rotating cylinder 22, the crushing cone 4 and the upper shearing disc 52, not only can large ores be sheared to reduce the crushing difficulty, but also the ores can be crushed twice to improve the crushing effect, and meanwhile, the sieve plate 6 is driven to move up and down through the sliding sleeve 24 and the connecting rod 25, so that the sieving of the ores can be accelerated, and the efficiency is improved; through shearing and two crushing to the ore for smash comparatively thoroughly, cut into the fritter with great ore before smashing, can improve crushing efficiency, prevent to cause great harm to equipment.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. An ore crushing and screening machine, includes organism (1), its characterized in that: the middle part of the machine body (1) is provided with a rotating mechanism (2), the rotating mechanism (2) comprises an outer rotating cylinder (21), the inner side wall of the outer rotating cylinder (21) is provided with an inner wave-shaped sliding groove (211), the middle part of the inner side of the outer rotating cylinder (21) is provided with an inner rotating cylinder (22), the outer side wall of the inner rotating cylinder (22) is provided with an outer wave-shaped sliding groove (221), a U-shaped frame (23) is arranged between the outer rotating cylinder (21) and the inner rotating cylinder (22), two sides of the U-shaped frame (23) are respectively and movably sleeved with a sliding sleeve (24), two ends of the sliding sleeve (24) respectively extend to the inner sides of the inner wave-shaped sliding groove (211) and the outer wave-shaped sliding groove (221) and respectively slide on the inner sides of the inner wave-shaped sliding groove (211) and the outer wave-shaped sliding groove (221), the bottom ends of the two sliding sleeves (24), a hollow shaft (27) is movably sleeved on the outer side of the upper part of the solid shaft (26), the bottom end of the hollow shaft (27) is rotatably connected with the upper end of the outer rotating cylinder (21), a support (3) is arranged below the U-shaped frame (23), the front end and the rear end of the support (3) are fixedly connected with the inner side wall of the machine body (1), the middle part of the bottom end of the U-shaped frame (23) is fixedly inserted in the middle part of the support (3), the upper end of the outer rotating cylinder (21) is fixedly connected with a crushing cone (4), a first crushing cavity (11) is arranged between the machine body (1) and the crushing cone (4), and a second crushing cavity (12) is arranged between the machine body (1) and the outer rotating cylinder (21;
the upper portion of the crushing cone (4) is provided with a lower shearing disc (5), the lower shearing disc (5) is fixedly connected with the machine body (1), the middle portion of the lower shearing disc (5) is rotatably connected with the upper end of the hollow shaft (27), the upper portion of the lower shearing disc (5) is provided with an upper shearing disc (52), the middle portion of the upper shearing disc (52) is fixedly connected with the solid shaft (26), the upper surface of the lower shearing disc (5) is attached to the lower surface of the upper shearing disc (52), a plurality of lower shearing holes (51) and upper shearing holes (53) are respectively formed in the lower shearing disc (5) and the upper shearing disc (52), the lower portion of the U-shaped frame (23) is obliquely provided with a sieve plate (6), the side wall of the sieve plate (6) is attached to the inner side wall of the machine body (1), the bottom ends of the two connecting rods (25) are respectively fixedly connected with the two sides of the sieve plate (6), the upper end of the machine body (1) is fixedly provided with a motor (7), an output shaft of the motor (7) is fixedly connected with the upper end of the solid shaft (26), and one side of the bottom end of the machine body (1) is provided with a discharge hole (8).
2. An ore grinding and screening machine according to claim 1 characterised in that: the outer side walls of the crushing cone (4) and the outer rotary drum (21) are fixedly connected with bulges.
3. An ore grinding and screening machine according to claim 1 characterised in that: bearings (28) are installed at two ends of the sliding sleeve (24), and two ends of the sliding sleeve (24) respectively slide on the inner sides of the inner wave-shaped sliding groove (211) and the outer wave-shaped sliding groove (221) through the bearings (28).
4. An ore grinding and screening machine according to claim 1 characterised in that: the inner wave-shaped sliding groove (211) and the outer wave-shaped sliding groove (221) have the same number of wave crests and wave troughs and are equal in amplitude.
5. An ore grinding and screening machine according to claim 1 characterised in that: the lower shearing disc (5) and the upper shearing disc (52) are both concave.
6. An ore grinding and screening machine according to claim 1 characterised in that: the solid shaft (26) and the hollow shaft (27) movably penetrate through the upper end of the crushing cone (4).
7. An ore grinding and screening machine according to claim 1 characterised in that: a guide plate (9) is fixedly arranged on the inner side of the bottom of the machine body (1).
8. An ore grinding and screening machine according to claim 1 characterised in that: the outside fixed mounting of organism (1) has spiral material lifting machine (100), the feed inlet of spiral material lifting machine (100) bottom communicates with the inboard of organism (1) bottom, the discharge gate of spiral material lifting machine (100) upper end communicates with the inside in first broken chamber (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011561011.9A CN112844554B (en) | 2020-12-25 | 2020-12-25 | Ore crushing and screening machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561011.9A CN112844554B (en) | 2020-12-25 | 2020-12-25 | Ore crushing and screening machine |
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| CN112844554A true CN112844554A (en) | 2021-05-28 |
| CN112844554B CN112844554B (en) | 2022-05-06 |
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| CN211303344U (en) * | 2019-08-03 | 2020-08-21 | 陈美香 | Chinese-medicinal material grinder |
| CN210410878U (en) * | 2019-08-07 | 2020-04-28 | 龙游县河道疏浚砂资源开发有限公司 | Single-cylinder hydraulic cone crusher |
| CN211563084U (en) * | 2019-09-29 | 2020-09-25 | 潘光涛 | Agricultural chemical fertilizer processing is with screening grinder |
| CN211487832U (en) * | 2019-10-23 | 2020-09-15 | 鸡西哈工碳基材料科技有限公司 | Reducing mechanism is used in graphite production and processing |
| CN111054479A (en) * | 2019-12-16 | 2020-04-24 | 时守贺 | Grit crushing apparatus for building engineering |
| CN211801065U (en) * | 2019-12-23 | 2020-10-30 | 王丽水 | Chemical material grinding and screening device |
| CN111111819A (en) * | 2020-02-21 | 2020-05-08 | 广州力寄采矿设备有限公司 | Mining ore crushing and screening device |
| CN111841711A (en) * | 2020-07-29 | 2020-10-30 | 莫凤婷 | Building energy conservation and environmental protection is with effectual reducing mechanism of screening |
| CN111905862A (en) * | 2020-08-11 | 2020-11-10 | 曹利宏 | Building stones extrusion reducing mechanism that construction used |
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