CN216137344U - Cracking and powder removing device for organic matters in crushed aggregates - Google Patents
Cracking and powder removing device for organic matters in crushed aggregates Download PDFInfo
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- CN216137344U CN216137344U CN202022758023.2U CN202022758023U CN216137344U CN 216137344 U CN216137344 U CN 216137344U CN 202022758023 U CN202022758023 U CN 202022758023U CN 216137344 U CN216137344 U CN 216137344U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The utility model provides a cracking and powder removing device for organic matters in crushed aggregates, which comprises a cylinder body and a heating device positioned at one end of the cylinder body, wherein the heating device heats the interior of the cylinder body; the barrel comprises an inner barrel screen and an outer barrel which are sequentially coaxially nested from inside to outside, an annular cavity is formed between the inner barrel screen and the outer barrel, a feed inlet and a discharge outlet are respectively formed in two ends of the outer barrel, and crushed materials enter from the feed inlet, fall into the annular cavity through meshes of the inner barrel screen and are discharged from the discharge outlet. The cracking and powder removing device provided by the utility model is mainly used for cracking and crushing organic matters in crushed materials after crushing of waste lithium ion batteries, and has the advantages of simple structure, stable operation, low noise, high reliability, convenience in maintenance, capability of preventing blockage, high separation efficiency and the like.
Description
Technical Field
The utility model belongs to the technical field of crushing equipment, and particularly relates to a cracking and powder removing device for organic matters in crushed aggregates.
Background
Organic impurities in the electrode material after the lithium ion battery is crushed are mainly electrolyte, binder and diaphragm which are added in the battery manufacturing process. The battery electrolyte functions to achieve ionic conduction, and common electrolytes are DMC (dimethyl carbonate) and LiPF6 (lithium hexafluorophosphate). The binder is added to ensure the uniformity and safety of the material in pulping, plays a role in binding active material particles, binds the active material on a current collector and is beneficial to forming an SEI film on the surface of a carbon material; commonly used binders are: polyvinyl alcohol (PVA), Polytetrafluoroethylene (PTFE), sodium carboxymethylcellulose (CMC), polyolefins, and the like. At present, commercial lithium ion battery separator materials mainly comprise single-layer Polyethylene (PE), polypropylene (PP) microporous films and polypropylene/polyethylene/polypropylene (PP/PE/PP) three-layer microporous composite films.
Electrolyte among the old and useless lithium ion battery retrieves the degree of difficulty greatly, with high costs, does not have the retrieval value in the industry, and how to do not have the pollution treatment is the problem that must solve in the industry simultaneously, because the binder that adds has stronger viscidity, the electrode material after the breakage bonds on the mass flow body, if do not handle the binder, is unfavorable for the sorting recovery of later stage material. The doping of the fiber membrane also influences the processes of sorting, leaching, extraction and the like in the later period, so that an efficient and environment-friendly device needs to be developed for removing organic matters in crushed materials.
CN207398307U discloses a treatment system for waste lithium ion batteries. The system comprises a crushing device, a low-temperature gasification cracking furnace, a combustion device, a flue gas purification device, a fine crushing and screening device, a metal recovery device, an acid leaching device and a positive electrode material precursor preparation device, wherein the crushing device is used for crushing the electric core of the waste lithium ion battery; the low-temperature gasification cracking furnace is used for carrying out low-temperature gasification cracking on the crushed battery materials to obtain cracking gas and solid residues; the air inlet of the combustion device is respectively connected with the pyrolysis gas outlet and the volatile organic compound outlet; the flue gas purification device comprises a purification furnace, a lime milk injection device and a dust remover; the metal recovery device is used for recovering iron, aluminum and copper in the metal sheet; the acid leaching device is used for performing acid leaching on the powder to obtain filtrate; the anode material precursor preparation device is used for preparing a precursor material by using the filtrate.
CN107959076A discloses a method for treating waste lithium ion batteries. The method comprises the following steps: s1, crushing the battery cell to obtain battery cell crushed materials and volatile organic compounds; s2, carrying out low-temperature gasification cracking on the crushed battery cell to obtain cracked gas and solid residues; s3, burning the pyrolysis gas and the volatile organic compounds to obtain flue gas; s4, spraying lime milk into the flue gas for deacidification reaction so as to convert the phosphorus-containing acid gas in the flue gas into calcium phosphate and convert the fluorine-containing acid gas into calcium fluoride; dedusting and discharging the flue gas after reaction; s5, finely crushing and screening the solid residues to obtain powder and metal sheets; s6, recovering iron, aluminum and copper in the metal sheet; s7, performing acid leaching on the powder, and filtering to obtain a filtrate; and preparing a precursor material by using the filtrate.
CN111895422A discloses pyrolysis oven is used in lithium cell recovery, including heating tank and well bull stick, well bull stick movable mounting is in the inboard intermediate position of heating tank, the inside of heating tank is close to the upper end fixed mounting who puts the bull stick in, the outer fixed surface of one side of putting the bull stick has first rotatory frame, and the opposite side outer fixed surface of putting the bull stick in installs the rotatory frame of second, the equal movable mounting of the inboard intermediate position of first rotatory frame and the rotatory frame of second has the hob, the surface of putting the bull stick in is close to, the fixed cover in the upper portion that the surface of hob is close to first rotatory frame and the rotatory frame of second has connect first fluted disc.
The traditional method is that organic matters and PVDF in materials are firstly removed through modes such as pyrolysis and cracking, and then powder and copper and aluminum are separated through a crushing and screening mode.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a cracking and powder removing device for organic matters in crushed aggregates. The cracking and powder removing device provided by the utility model is mainly used for cracking and crushing organic matters in crushed materials after crushing of waste lithium ion batteries, and has the advantages of simple structure, stable operation, low noise, high reliability, convenience in maintenance, capability of preventing blockage, high separation efficiency and the like.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a cracking and powder removing device for organic matters in crushed aggregates, which comprises a cylinder body and a heating device positioned at one end of the cylinder body, wherein the heating device heats the inside of the cylinder body.
The barrel comprises an inner barrel screen and an outer barrel which are sequentially coaxially nested from inside to outside, an annular cavity is formed between the inner barrel screen and the outer barrel, a feed inlet and a discharge outlet are respectively formed in two ends of the outer barrel, and crushed materials enter from the feed inlet, fall into the annular cavity through meshes of the inner barrel screen and are discharged from the discharge outlet.
The cracking and de-powdering device provided by the utility model is mainly used for cracking and crushing organic matters in crushed materials of waste lithium ion batteries, hot atmosphere generated by the heating device enters the inner cylinder and contacts with the crushed materials of the batteries so as to pyrolyze the organic matters in the crushed materials, and the crushed materials of the batteries subjected to pyrolysis crushing pass through the annular cavity after being screened by the screen of the inner cylinder and are discharged by the outer cylinder.
As a preferable technical scheme, the inner cylinder screen is in transmission connection with a driving module, and the driving module is used for driving the inner cylinder screen to rotate.
The driving module comprises a driving motor and a driving connecting rod, one end of the driving connecting rod is in transmission connection with an output shaft of the driving motor, and the other end of the driving connecting rod is fixed with one end of the inner cylinder screen.
The utility model drives the cylinder body to rotate by arranging the driving module, along with the rotation of the cylinder body, crushed materials (including powder and pyrolyzed organic matter fragments) in the inner cylinder pass through the screen of the inner cylinder to enter the annular cavity and are discharged from the discharge hole through the annular cavity, tail gas generated in the pyrolyzing process passes through the screen of the inner cylinder and is discharged from the annular cavity through the tail gas discharging device,
as a preferable technical scheme of the utility model, the inner cylinder screen is filled with an ore grinding medium.
As a preferable technical scheme of the utility model, the ore grinding medium comprises steel balls or zirconia balls.
The diameter of the grinding medium is 2 to 15cm, for example, 2cm, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm or 15cm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
According to the utility model, an ore grinding medium is filled in the inner cylinder, in the rotation process of the inner cylinder, the battery crushed aggregates are in contact friction with the ore grinding medium, the pole piece is refined under the friction action of the ore grinding medium, and powder on the surface of the pole piece falls off from the surface of the pole piece.
As a preferable technical scheme of the utility model, the cylinder body is obliquely arranged, and the heating device is positioned at the high-position end of the cylinder body.
The feed inlet is positioned at one end of the outer barrel close to the heating device, and the discharge outlet is positioned at one end of the outer barrel far away from the heating device.
As a preferred technical solution of the present invention, the inner cylinder screen is detachably fixed inside the outer cylinder, and the gap between the inner cylinder screen and the outer cylinder is adjusted by replacing the outer cylinders with different diameters.
In a preferred embodiment of the present invention, the distance between the inner wall of the outer cylinder and the outer wall of the screen of the inner cylinder is 3 to 15cm, and may be, for example, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm or 15cm, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the mesh number of the inner screen is 10 to 60 mesh, and may be, for example, 10 mesh, 15 mesh, 20 mesh, 25 mesh, 30 mesh, 35 mesh, 40 mesh, 45 mesh, 50 mesh, 55 mesh or 60 mesh, but is not limited to the above numerical values, and other numerical values not listed in the numerical value range are also applicable.
As a preferable technical scheme, one end of the lower position of the cylinder body is also provided with a tail gas discharge device, and tail gas generated in the cracking and powder removing process passes through the screen of the inner cylinder and is discharged out of the tail gas discharge device through the annular cavity.
As a preferable technical solution of the present invention, the heating device is an electric heater or a gas heater.
Illustratively, the working principle of the cracking and powder removing device provided by the utility model is as follows:
this equipment is at the during operation, adds furnace from the crushed aggregates after the feed inlet is broken with old and useless lithium ion battery, utilizes combustion assembly to produce hot atmosphere in the combustion chamber, thereby hot atmosphere can get into furnace and crushed aggregates contact and make crushed aggregates pyrolysis, and the flue gas that produces during the pyrolysis passes through the exhanst gas outlet and discharges, and the material and the medium after the heating mix, carry out the pyrolysis and smash, and kibbling material gets into the intermediate layer from the inner tube screen cloth, discharges through the discharge gate. Because the hot atmosphere can fully and evenly contact with the crushed aggregates in the hearth, the pyrolysis efficiency, the pyrolysis uniformity and the pyrolysis sufficiency of organic matters in the crushed aggregates can be greatly improved, and in the pyrolysis process, PVDF is eliminated, the pole pieces are refined under the action of a medium, and meanwhile, the powder pole pieces fall off and enter the interlayer through the screen mesh. In addition, the crushed aggregates are treated in the hearth of the furnace body, so that the heat loss can be reduced, and the heat utilization rate is improved.
Compared with the prior art, the utility model has the beneficial effects that:
the cracking and de-powdering device provided by the utility model is mainly used for cracking and crushing organic matters in crushed materials of waste lithium ion batteries, hot atmosphere generated by the heating device enters the inner cylinder and contacts with the crushed materials of the batteries so as to pyrolyze the organic matters in the crushed materials, and the crushed materials of the batteries subjected to pyrolysis crushing pass through the annular cavity after being screened by the screen of the inner cylinder and are discharged by the outer cylinder.
Drawings
Fig. 1 is a schematic structural diagram of an organic matter cracking and powder removing device according to an embodiment of the present invention.
Wherein, 1-a heating device; 2-a cylinder body; 3-outer cylinder; 4-an annular cavity; 5-inner cylinder screen mesh; 6-grinding the ore medium; 7-a tail gas discharge device; 8-a feed inlet; 9-discharge port.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the present invention provides a cracking and de-powdering device for organic matters in crushed aggregates, which comprises a cylinder 2 and a heating device 1 positioned at one end of the cylinder 2, wherein the heating device 1 can be selected from an electric heater and a gas heater, and the heating device 1 heats the inside of the cylinder 2.
The cylinder body 2 comprises an inner cylinder screen 5 and an outer cylinder 3 which are coaxially nested from inside to outside in sequence, and an annular cavity 4 is formed between the inner cylinder screen 5 and the outer cylinder 3. The mesh number of the inner cylinder screen 5 is 10-60 meshes. The inner cylinder screen cloth 5 can be dismantled and be fixed in 3 insides of urceolus, realizes the clearance adjustment between inner cylinder screen cloth 5 and urceolus 3 through changing the urceolus 3 of different diameters, 3 inner walls of urceolus and the inner cylinder screen cloth 5 outer wall between the distance be 3 ~ 15 cm.
The inner cylinder screen 5 is in transmission connection with a driving module, and the driving module is used for driving the inner cylinder screen 5 to rotate. Specifically, the driving module comprises a driving motor and a driving connecting rod, one end of the driving connecting rod is in transmission connection with an output shaft of the driving motor, and the other end of the driving connecting rod is fixed with one end of the cylinder 2.
The barrel 2 is obliquely arranged, the heating device 1 is positioned at the high-position end of the barrel 2, the feeding hole 8 is positioned at one end of the outer barrel 3 close to the heating device 1, and the discharging hole 9 is positioned at one end of the outer barrel 3 far away from the heating device 1. And a tail gas discharge device 7 is further arranged at the lower end of the barrel 2, and tail gas generated in the cracking and powder removing process passes through the inner barrel screen 5 and is discharged outside from the tail gas discharge device 7 through the annular cavity 4.
A feed inlet 8 and a discharge outlet 9 are respectively arranged at two ends of the outer cylinder 3, and crushed aggregates enter from the feed inlet 8, fall into the annular cavity 4 through meshes of the inner cylinder screen 5 and are discharged from the discharge outlet 9. An ore grinding medium 6 is filled in the inner cylinder screen 5, the ore grinding medium 6 comprises steel balls or zirconia balls, and the diameter of the ore grinding medium 6 is 2-15 cm.
In another embodiment, the utility model provides a method for cracking and de-powdering crushed materials of waste lithium ion batteries by using the cracking and de-powdering device, wherein the method comprises the following steps:
crushed materials of the waste lithium ion battery are fed into the inner cylinder through the feeding hole 8; starting the driving module, enabling the inner cylinder screen 5 to rotate under the driving of the driving module, and introducing protective gas into the cylinder 2; heating the interior of the cylinder body 2 by a heating device 1, wherein the mesh number of the screen 5 of the inner cylinder is 30 meshes, pyrolyzing and crushing organic matters in the crushed materials in a high-temperature environment, refining the pole piece under the action of an ore grinding medium 6 and dropping powder on the surface of the pole piece; along with the rotation of the cylinder body 2, the crushed materials (including powder and pyrolyzed organic matter fragments) in the inner cylinder pass through the inner cylinder screen 5 to enter the annular cavity 4 and are discharged from the discharge hole 9 through the annular cavity 4, and tail gas generated in the pyrolysis process passes through the inner cylinder screen 5 and is discharged from the annular cavity 4 through the tail gas discharge device 7.
Example 1
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, which is based on a specific implementation mode, wherein the mesh number of an inner cylinder screen 5 is 10 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 3cm, an ore grinding medium 6 is a steel ball, and the diameter of the ore grinding medium 6 is 2 cm.
Example 2
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, and is based on the cracking and de-powdering device provided by a specific embodiment, wherein the mesh number of an inner cylinder screen 5 is 20 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 6cm, an ore grinding medium 6 is a zirconia ball, and the diameter of the ore grinding medium 6 is 5 cm.
Example 3
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, which is based on a specific implementation mode, wherein the mesh number of an inner cylinder screen 5 is 30 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 8cm, an ore grinding medium 6 is a steel ball, and the diameter of the ore grinding medium 6 is 8 cm.
Example 4
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, and is based on a specific implementation mode, wherein the mesh number of an inner cylinder screen 5 is 40 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 10cm, an ore grinding medium 6 is a zirconia ball, and the diameter of the ore grinding medium 6 is 10 cm.
Example 5
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, and is based on a specific implementation mode, wherein the mesh number of an inner cylinder screen 5 is 50 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 13cm, an ore grinding medium 6 comprises steel balls or zirconia balls, and the diameter of the ore grinding medium 6 is 13 cm.
Example 6
The embodiment provides a cracking and de-powdering device for organic matters in crushed aggregates, and is based on a specific implementation mode, wherein the mesh number of an inner cylinder screen 5 is 60 meshes, the distance between the inner wall of an outer cylinder 3 and the outer wall of the inner cylinder screen 5 is 15cm, an ore grinding medium 6 comprises steel balls or zirconia balls, and the diameter of the ore grinding medium 6 is 15 cm.
Application example
The cracking and de-powdering device provided by the specific embodiment is used for cracking and de-powdering crushed materials of the waste lithium ion batteries, and the treatment method comprises the following steps:
(1) the crushed battery crushed aggregates are 500kg and comprise a diaphragm, a positive plate, a negative plate and powder, the crushed battery crushed aggregates are fed into the inner cylinder from the feeding hole 8, and the feeding speed of the crushed battery crushed aggregates is controlled at 500 kg/h;
(2) starting the driving module, enabling the cylinder 2 to rotate under the driving of the driving module, and introducing protective gas into the cylinder 2; the interior of the cylinder body 2 is heated to 400-450 degrees through the heating device 1, and the mesh number of the inner cylinder screen 5 is 30 meshes;
(3) in a high-temperature environment, organic matters in the crushed aggregates are pyrolyzed and crushed, the pole pieces are refined under the action of an ore grinding medium 6 and powder on the surfaces of the pole pieces is knocked down, crushed materials (including powder and pyrolyzed organic matter fragments) in the inner cylinder pass through the inner cylinder screen 5 to enter the annular cavity 4 along with the rotation of the cylinder body 2 and are discharged from the discharge hole 9 through the annular cavity 4, and tail gas generated in the pyrolysis process passes through the inner cylinder screen 5 and is discharged from the annular cavity 4 through the tail gas discharge device 7.
After the treatment, 425kg of the crushed material is discharged from the discharge port 9, and is sieved again by a 200-mesh sieve, 321kg of undersize materials and 104kg of oversize materials are undersize materials, the undersize materials are anode and cathode powder materials, the recovery rate is 96%, the content of impurity aluminum is 0.5%, and the content of impurity copper is 0.7%.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (9)
1. The cracking and powder removing device for organic matters in crushed aggregates is characterized by comprising a cylinder and a heating device positioned at one end of the cylinder, wherein the heating device heats the inside of the cylinder;
the cylinder comprises an inner cylinder screen and an outer cylinder which are coaxially nested from inside to outside in sequence, an annular cavity is formed between the inner cylinder screen and the outer cylinder, a feed port and a discharge port are respectively formed at two ends of the outer cylinder, and crushed aggregates enter from the feed port, fall into the annular cavity through meshes of the inner cylinder screen and are discharged from the discharge port;
the cylinder body is obliquely arranged, and the heating device is positioned at the high-position end of the cylinder body;
the feed inlet is positioned at one end of the outer barrel close to the heating device, and the discharge outlet is positioned at one end of the outer barrel far away from the heating device.
2. The cracking and pollen-removing device of claim 1, wherein the inner cylinder screen is in transmission connection with a driving module, and the driving module is used for driving the inner cylinder screen to rotate;
the driving module comprises a driving motor and a driving connecting rod, one end of the driving connecting rod is in transmission connection with an output shaft of the driving motor, and the other end of the driving connecting rod is fixed with one end of the inner cylinder screen.
3. The pyrolysis powder removing device as claimed in claim 1, wherein the screen of the inner cylinder is filled with an ore grinding medium.
4. The pyrolysis powder removing device according to claim 3, wherein the ore grinding medium comprises steel balls or zirconia balls;
the diameter of the ore grinding medium is 2-15 cm.
5. The pyrolysis powder removing device as claimed in claim 1, wherein the inner cylinder screen is detachably fixed inside the outer cylinder, and the gap between the inner cylinder screen and the outer cylinder is adjusted by replacing outer cylinders with different diameters.
6. The cracking and flour-removing device of claim 1, wherein the distance between the inner wall of the outer cylinder and the outer wall of the screen of the inner cylinder is 3-15 cm.
7. The cracking and pollen-removing device of claim 1, wherein the mesh number of the inner cylinder screen is 10-60 meshes.
8. The cracking and powder removing device of claim 1, wherein a tail gas exhaust device is further arranged at the lower end of the cylinder, and tail gas generated in the cracking and powder removing process passes through the screen of the inner cylinder and is discharged outside from the tail gas exhaust device through the annular cavity.
9. The pyrolysis powder removing device as claimed in claim 1, wherein the heating device is an electric heater or a gas heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022758023.2U CN216137344U (en) | 2020-11-25 | 2020-11-25 | Cracking and powder removing device for organic matters in crushed aggregates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022758023.2U CN216137344U (en) | 2020-11-25 | 2020-11-25 | Cracking and powder removing device for organic matters in crushed aggregates |
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| CN216137344U true CN216137344U (en) | 2022-03-29 |
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| CN202022758023.2U Active CN216137344U (en) | 2020-11-25 | 2020-11-25 | Cracking and powder removing device for organic matters in crushed aggregates |
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