CN209810660U - Coal ash rolling screening machine - Google Patents

Coal ash rolling screening machine Download PDF

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Publication number
CN209810660U
CN209810660U CN201920228148.9U CN201920228148U CN209810660U CN 209810660 U CN209810660 U CN 209810660U CN 201920228148 U CN201920228148 U CN 201920228148U CN 209810660 U CN209810660 U CN 209810660U
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China
Prior art keywords
screen
screening
fly ash
machine
frame
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CN201920228148.9U
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Chinese (zh)
Inventor
杨小阔
吕书彬
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Jinzhou Fulong Building Materials Co Ltd
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Jinzhou Fulong Building Materials Co Ltd
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Abstract

The utility model discloses a coal ash rolling screening machine, which relates to the technical field of coal ash processing, and adopts the technical scheme that the machine comprises a frame and a rolling screen body rotationally connected on the frame, wherein the rolling screen body is connected with a driving motor, the two ends of the rolling screen body are respectively a feeding end and a slag discharging end, a collecting hopper is arranged below the rolling screen body, and the outer wall of the collecting hopper is provided with a vibration motor; the collecting hopper is connected with a secondary screening mechanism; second grade screening mechanism includes casing and first screening subassembly, and first screening subassembly includes first screen cloth and first fixed frame, and acute angle contained angle slope setting is personally submitted with the level to first screen cloth, and the lower one end that lies in first screen cloth on the casing is equipped with first discharge gate, and the bottom of casing is uncovered. The utility model provides a poor problem that influences follow-up utilization of present fly ash screening back granularity concentration, through at roll screen discharge gate position installation second grade screening mechanism, with the fly ash screening into different mesh numbers, improve the granularity concentration of fly ash.

Description

Coal ash rolling screening machine
Technical Field
The utility model relates to a fly ash processing technology field, more specifically the saying so, it relates to a fly ash roll screening machine.
Background
In the process of treating the fly ash, the fly ash needs to be primarily screened, and the large materials in the fly ash are screened out to obtain the fly ash with required fineness for producing concrete or other purposes.
The utility model discloses a prior art refers to utility model patent that grant publication number is CN207756459U, and it discloses a fly ash roll screening machine, including base, roll screen frame, rotary driving motor, funnel, band conveyer and chute feeder, still include swing drive frame and articulated support frame, swing drive frame and articulated support frame set up respectively at the base both ends, the roll screen frame includes the pivot and fixes the sieve section of thick bamboo on the circumference is outer in the pivot, pivot one end is connected with swing drive frame, and the other end is connected with articulated support frame, rotary driving motor is connected with the other end of pivot, the funnel is fixed on the base and is located sieve section of thick bamboo below, band conveyer fixes and is located the funnel below on the base, chute feeder detachably sets up on the base and is located swing drive frame top. The utility model discloses an utilize swing drive frame and articulated support frame and roll screen connection, realize the luffing motion of roll screen, can obtain more screening effect in carrying out the fly ash screening process. However, the utility model has the following disadvantages: as the mesh size of the screen cylinder is fixed, the fly ash with the particle size smaller than the diameter of the mesh can pass through the screen cylinder, and the particle size concentration of the screened fly ash is poor, so that the subsequent use is influenced.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a fly ash roll screening machine, through at roll screen discharge gate position installation second grade screening mechanism, fall into different mesh with the fly ash sieve, improve the granularity concentration degree of fly ash.
In order to achieve the above purpose, the utility model provides a following technical scheme: a coal ash rolling screening machine comprises a rack and a rolling screen body rotationally connected to the rack, wherein the rolling screen body is connected with a driving motor for driving the rolling screen body to rotate; the collecting hopper is connected with a secondary screening mechanism; the second grade screening mechanism includes the casing of being connected with the collecting hopper and sets up the first screening subassembly in the casing, and first screening subassembly includes first screen cloth and first fixed frame, and acute angle contained angle slope setting is personally submitted with the level to first screen cloth, lies in the lower one end of first screen cloth on the casing and is equipped with first discharge gate, and the bottom of casing is uncovered.
By adopting the technical scheme, the driving motor works to drive the rolling screen body to rotate, the fly ash raw material is put into the rolling screen body from the feeding end, and the fly ash with larger particles or caking moves to the slag discharging end in the rotating process of the rolling screen body; fine fly ash sees through the rolling screen frame and drops in the collecting hopper of below, and the fly ash of screening falls on first screen cloth, because shock dynamo's effect, first screen cloth vibrations and sieve fly ash once more, see through the fly ash of first screen cloth and discharge from the casing bottom, and fly ash on the first screen cloth is discharged from first discharge gate to make the concentration of fly ash higher.
The utility model discloses further set up to: the casing is provided with a socket matched with the first fixing frame, and the first screening assembly is connected with the casing in an inserting mode.
Through adopting above-mentioned technical scheme, first screen assembly can be followed and is pulled out in the socket, when damage appears in first screen cloth of first screen assembly, can maintain first screen assembly, prolongs the life of whole equipment.
The utility model discloses further set up to: the first screen is detachably connected with the first fixing frame.
By adopting the technical scheme, the first screen with different meshes can be replaced, so that the fly ash on the first screen is concentrated in the required mesh range, and different requirements are met.
The utility model discloses further set up to: a second screen assembly is arranged below the first screen assembly in the shell and comprises a second screen and a second fixing frame, and the second screen and the horizontal plane form an acute included angle in an inclined mode; the lower one end of casing lateral wall position second screen cloth is equipped with the second discharge gate.
By adopting the technical scheme, the fly ash is screened twice, the mesh number of the fly ash between the first screen and the second screen is more concentrated, the fly ash can be divided into three batches, and the particle size concentration of the unbatched fly ash is improved.
The utility model discloses further set up to: the casing is provided with an opening matched with the second fixing frame, and the second screening assembly is connected with the casing in an inserting mode.
Through adopting above-mentioned technical scheme, when damage appears in the second screen cloth on the second sieve powder subassembly, can maintain second sieve subassembly, prolong the life of whole equipment.
The utility model discloses further set up to: the second screen is detachably connected with the second fixing frame.
Through adopting above-mentioned technical scheme, as required, can change the second screen cloth of different mesh numbers for the cooperation of second screen cloth and first screen cloth is so that sieve out the fly ash of required mesh number concentration, and the granularity concentration of fly ash is convenient for control.
The utility model discloses further set up to: a dust cover is arranged outside the rolling screen body and fixedly connected with the rack, and the dust cover is rotatably connected with the rolling screen body through a bearing; the bottom of the dust cover is communicated with the aggregate bin.
Through adopting above-mentioned technical scheme, the dust cover prevents effectively that the roll screen body from rotating in-process fly ash rotatory the escaping to the outside air, plays good dustproof effect, keeps the air cleanness of work area.
The utility model discloses further set up to: the slag discharge end is connected with a crushing mechanism, the crushing mechanism comprises a shell and two grinding rollers which are mutually abutted and horizontally and rotatably connected to the shell, and one end of each grinding roller is connected with a power assembly which drives the two grinding rollers to rotate oppositely; a conveying mechanism is connected between the bottom of the machine shell and the feeding end.
By adopting the technical scheme, the fly ash raw material is put into the rolling screen body from the feeding end, the driving motor works to drive the rolling screen body to rotate, and the fly ash with larger particles or caking moves to the slag discharging end in the rotating process of the rolling screen body. Large particles or agglomerated fly ash falling from the slag discharge end enters the crushing mechanism, the power assembly works to drive the two grinding rollers to oppositely abut against and rotate, the grinding rollers grind the agglomerated fly ash, and the ground fly ash is conveyed to the feed end of the rolling screen body under the action of the conveying mechanism to participate in screening again, so that the utilization rate of the fly ash is improved.
The utility model discloses further set up to: conveying mechanism is including connecting in the conveying pipeline of chassis bottom and feed end intercommunication and installing at the fan that the conveying pipeline is close to casing one end, and the air current that the fan insufflated the conveying pipeline flows towards the feed end.
By adopting the technical scheme, the fan blows high-speed airflow into the conveying pipe, the high-speed airflow blows powdery fly ash into the rolling screen body to participate in secondary screening, and the conveying mechanism is simple in structure and convenient to install and maintain.
To sum up, the utility model discloses compare and have following beneficial effect in prior art:
1. the fly ash raw material is put into the rolling screen body from the feeding end, and the fly ash with larger particles or caking moves to the slag discharging end in the rotating process of the rolling screen body; fine fly ash falls into a collecting hopper below through the rolling screen body, the screened fly ash falls onto the first screen, the first screen vibrates and screens the fly ash again under the action of the vibration motor, the fly ash penetrating through the first screen is discharged from the bottom of the shell, and the fly ash on the first screen is discharged from the first discharge hole, so that the concentration of the fly ash is higher;
2. the second screen with different meshes can be replaced, so that the second screen is matched with the first screen to screen the fly ash with the required mesh concentration, and the particle size concentration of the fly ash is convenient to control;
3. the dust cover effectively prevents that the rotation of roll screen body in-process fly ash from overflowing to the outside air in, plays good dustproof effect, keeps the air cleanness in work area, the environmental protection.
Drawings
FIG. 1 is a schematic view of the overall structure of the embodiment;
FIG. 2 is a sectional view in the direction A-A in FIG. 1 showing the internal structure of the primary screening mechanism and the secondary screening mechanism;
FIG. 3 is a partial cross-sectional view taken along line B-B of FIG. 2;
figure 4 is an exploded view showing the construction of a first screen assembly.
Reference numerals: 1. a frame; 2. a dust cover; 21. a material guide pipe; 22. a collection hopper; 23. vibrating a motor; 3. a primary screening mechanism; 31. a drive motor; 32. screening gears; 33. rolling the screen body; 331. a ring gear; 4. a crushing mechanism; 41. a housing; 411. a discharge pipe; 412. a baffle; 42. a grinding motor; 43. a first grinding roller; 44. a second grinding roller; 45. a brush; 5. a conveying mechanism; 51. a fan; 52. a delivery pipe; 521. a slag collection hopper; 522. a slag receiving box; 523. a wind deflector; 6. a secondary screening mechanism; 61. a housing; 611. a first discharge port; 612. a second discharge port; 62. a first screen assembly; 621. a first fixed frame; 6211. a stopper; 6212. a handle; 622. a first screen; 63. a second screen assembly; 7. an ultra-fine powder box; 8. a coarse powder box; 9. a fine powder box.
Detailed Description
Example (b): a coal ash rolling screening machine is shown in figures 1 and 2 and comprises a frame 1 and a primary screening mechanism 3 arranged on the frame 1, wherein a dust cover 2 fixed on the frame 1 is arranged outside the primary screening mechanism 3, and the primary screening mechanism 3 comprises a cylindrical rolling screen body 33 rotationally connected to the inside of the dust cover 2 and a driving motor 31 driving the rolling screen body 33 to rotate; a funnel-shaped collecting hopper 22 is arranged at the bottom of the dust cover 2 close to the ground, one end of the rolling screen body 33 is a feeding end, and the other end of the rolling screen body is a slag discharging end; the slag discharging end is connected with a crushing mechanism 4 through a material guide pipe 21, and a conveying mechanism 5 is connected between the crushing mechanism 4 and the feeding end; the bottom of the collecting hopper 22 is connected with a secondary screening mechanism 6. The fly ash raw material is fed from the feeding end of the rolling screen body 33, the driving motor 31 drives the rolling screen body 33 to rotate and screen the fly ash raw material, fine fly ash falls into the collecting hopper 22 through the rolling screen body 33, and the fly ash in the collecting hopper 22 enters the secondary screening mechanism 6 for further screening under the action of gravity; the agglomerated or large-particle fly ash is left on the rolling screen body 33 and moves to the slag discharge end along with the rotation of the rolling screen body 33, then the agglomerated or large-particle fly ash enters the crushing mechanism 4 along the material guide pipe 21, and the crushed fly ash enters the feeding end again through the conveying mechanism 5 to participate in screening, so that the utilization rate of the fly ash is improved.
Referring to fig. 1 and 2, the dust cover 2 is cylindrical, can be made of stainless steel, has high strength, is not easy to deform, and has a prolonged service life. The two ends of the dust cover 2 are fixedly supported by the frame 1.
The rolling screen body 33 and the dust cover 2 can be coaxially arranged, and the rolling screen body 33 and the two ends of the dust cover 2 are rotatably connected through bearings. According to the requirement, the axis of the rolling screen body 33 and the horizontal plane form an included angle which can be 3 degrees to 5 degrees, and the axis inclines downwards from the feeding end to the slag discharging end, so that the rolling screen is beneficial to caking or the large-particle fly ash moves to the slag discharging end.
The outer wall of the rolling screen body 33 close to the feeding end is coaxially and fixedly provided with a gear ring 331, the driving motor 31 can be mounted on the dust cover 2 through bolts, the output shaft of the driving motor 31 is fixedly provided with a screening gear 32, and the screening gear 32 is meshed with the gear ring 331.
Referring to fig. 1 and 2, the crushing mechanism 4 includes a housing 41, a first crushing roller 43 and a second crushing roller 44 horizontally rotatably connected in the housing 41, a crushing motor 42 installed outside the housing 41 and connected to an end of the first crushing roller 43, and ends of the first crushing roller 43 and the second crushing roller 44 are gear-connected; an opening communicated with the material guide pipe 21 is formed at the top of the machine case 41 corresponding to the space between the first rolling roller 43 and the second rolling roller 44, and a material discharge pipe 411 is formed at the bottom of the machine case 41. The crushing motor 42 operates to drive the first roller 43 to rotate, the second roller 44 in transmission connection with the first roller 43 correspondingly rotates, the agglomerated or large-particle fly ash entering between the first roller 43 and the second roller 44 is crushed, and the crushed fly ash falls down from the discharge pipe 411.
In order to ensure that the fly ash falling from the material guiding pipe 21 accurately enters between the first grinding roller 43 and the second grinding roller 44, flow guiding plates 412 are fixedly arranged at two sides of the opening, the two flow guiding plates 412 are arranged in a V shape, and the bottom ends of the flow guiding plates 412 extend to the upper part of the joint of the two grinding rollers. A brush 45 is fixedly installed on the inner side wall of the casing 41, and the ends of the brush 45 respectively abut against the surfaces of the first grinding roller 43 and the second grinding roller 44, so as to sweep away the fly ash remaining on the surfaces of the first grinding roller 43 and the second grinding roller 44.
Referring to fig. 1 and 2, the conveying mechanism 5 includes a conveying pipe 52 communicating with the discharge pipe 411, one end of the conveying pipe 52 is connected with a fan 51, and the other end of the conveying pipe 52 extends to the feeding end. The material conveying pipe 52 and the material discharging pipe 411 are arranged in a T shape. After the pulverized fly ash enters the conveying pipe 52 from the discharge pipe 411, the wind blown by the fan 51 blows the fly ash along the conveying pipe 52 into the rolling screen 33 for secondary screening.
The feeding pipe 52 is provided with a vertical section near the feeding end, the bottom of the vertical section is provided with a slag collecting hopper 521, and the bottom of the slag collecting hopper 521 is inserted with a baffle (not shown in the figure). A slag receiving box 522 is arranged below the slag collecting hopper 521. A small amount of larger-particle fly ash or heavier impurities still exist after the agglomerated fly ash is crushed, the fine fly ash enters the rolling sieve body along the vertical section along with the airflow, the residual larger-particle fly ash or impurities fall into the slag collecting hopper under the action of gravity, and the baffle is opened periodically as required to be discharged, so that the purity of the fly ash is improved.
Referring to fig. 3, in order to prevent the flow of the air blown by the fan 51 along the discharge pipe 411 from affecting the falling of the fly ash, a wind deflector 523 is fixed on the bottom end of the feed delivery pipe 52 at a side close to the fan 51, the wind deflector 523 is arranged obliquely downwards from one end close to the fan 51 to the other end, and the outline of the wind deflector 523 is larger than the cross-sectional area of the discharge pipe 411.
Referring to fig. 1 and 2, a vibration motor 23 is installed on the outer side wall of the collecting hopper 22, and the vibration motor 23 works to vibrate the collecting hopper 22, so as to prevent the fly ash from accumulating and blocking in the collecting hopper 22, and facilitate the falling of the fly ash.
The secondary screening mechanism 6 comprises a shell 61 fixedly installed with the collecting hopper 22, and the shell 61 can also be fixed on the frame 1 according to requirements; housing 61 has first screen assembly 62 and second screen assembly 63 mounted therein, first screen assembly 62 and second screen assembly 63 are flat and are positioned in an inclined configuration, the direction of inclination of first screen assembly 62 is opposite to that of second screen assembly 63; a first discharge port 611 is formed in the side wall of housing 61 corresponding to the bottom of first screen assembly 62, and a second discharge port 612 is formed in the side wall of housing 61 corresponding to the bottom of second screen assembly 63; the bottom of the case 61 is open.
Referring to FIGS. 2 and 4, housing 61 is provided with a receptacle for insertion of first screen assembly 62 and second screen assembly 63, respectively, so that first screen assembly 62 or second screen assembly 63 can be removed from the receptacle for replacement and maintenance, extending the useful life of the entire apparatus.
The first screen assembly 62 includes a rectangular first fixed frame 621 and a first screen 622 mounted to the first fixed frame 621 by screws, the first screen 622 may be a nylon screen. Because the first screen 622 is detachably connected with the first fixing frame 621 through the screws, the first screen 622 can be replaced after the first screen 622 is worn, and the screening effect of the whole device is prolonged. A stop block 6211 is fixedly arranged at one end of the first fixing frame 621 close to the insertion opening, the stop block 6211 can prevent the first screening component 62 from falling into the shell 61, and the insertion opening is blocked by the stop block 6211. A handle 6212 is mounted to stop 6211 to facilitate manual insertion and removal of first screen assembly 62.
Second screen assembly 63 is identical in construction to first screen assembly 62 and includes a removable second screen and a second frame for ease of manufacture and maintenance. The mesh sizes of the first screen and the second screen can be adjusted as required to screen out the fly ash with the required particle size concentration.
Referring to fig. 2, a superfine powder tank 7 is arranged below the bottom opening of the shell 61, a coarse powder tank 8 is arranged below the first discharge port 611, and a fine powder tank 9 is arranged below the second discharge port 612. After falling down, the fly ash in the collecting hopper 22 is sieved by the first sieving assembly 62, and the fly ash remained on the first sieving assembly 62 is discharged into the coarse powder box 8 from the first discharge port 611; the fly ash passing through the first screen assembly 62 is subjected to secondary screening by the second screen assembly 63, and the fly ash remaining in the second screen assembly 63 is discharged from the second discharge port 612 to the fine powder box 9; the fly ash passing through the second screening component 63 falls into the superfine powder box 7, so that classification of different particle size concentration ratios of the fly ash is realized.
The working principle of the coal ash rolling screening machine is as follows:
the fly ash raw material is fed from the feeding end of the rolling screen body 33, the driving motor 31 drives the rolling screen body 33 to rotate and screen the fly ash raw material, and fine fly ash falls into the collecting hopper 22 through the rolling screen body 33; the agglomerated or large-particle fly ash is left on the rolling screen body 33 and moves to the slag discharge end along with the rotation of the rolling screen body 33, then the agglomerated or large-particle fly ash enters the crushing mechanism 4 along the material guide pipe 21, and the crushed fly ash enters the feeding end again through the conveying mechanism 5 to participate in screening, so that the utilization rate of the fly ash is improved.
After falling down, the fly ash in the collecting hopper 22 is sieved by the first sieving assembly 62, and the fly ash remained on the first sieving assembly 62 is discharged into the coarse powder box 8 from the first discharge port 611; the fly ash passing through the first screen assembly 62 is subjected to secondary screening by the second screen assembly 63, and the fly ash remaining in the second screen assembly 63 is discharged from the second discharge port 612 to the fine powder box 9; the fly ash passing through the second screening component 63 falls into the superfine powder box 7, so that classification of different particle size concentration ratios of the fly ash is realized.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a fly ash roll screening machine, includes frame (1) and rotates roll screen frame (33) of connecting in frame (1), roll screen frame (33) are connected with and drive its pivoted driving motor (31), and the both ends of roll screen frame (33) are the feed end respectively and arrange sediment end, its characterized in that: a material collecting hopper (22) is arranged below the rolling screen body (33), and a vibration motor (23) is arranged on the outer wall of the material collecting hopper (22); the collecting hopper (22) is connected with a secondary screening mechanism (6); second grade screening mechanism (6) are including casing (61) be connected with collecting hopper (22) and set up first screening subassembly (62) in casing (61), and first screening subassembly (62) are including first screen cloth (622) and first fixed frame (621), and acute angle contained angle slope setting is personally submitted with the level in first screen cloth (622), and the lower one end that lies in first screen cloth (622) on casing (61) is equipped with first discharge gate (611), and the bottom of casing (61) is uncovered.
2. The coal ash rolling screen machine according to claim 1, characterized in that: the shell (61) is provided with a socket matched with the first fixing frame (621), and the first screening assembly (62) is connected with the shell (61) in an inserting mode.
3. The coal ash rolling screen machine according to claim 2, characterized in that: the first screen (622) is detachably connected with the first fixing frame (621).
4. The coal ash rolling screen machine according to claim 1, characterized in that: a second screen assembly (63) is arranged below the first screen assembly (62) in the shell (61), the second screen assembly (63) comprises a second screen and a second fixed frame, and the second screen and the horizontal plane form an acute included angle and are obliquely arranged; and a second discharge hole (612) is formed in one end, positioned at the lower part of the second screen, of the side wall of the shell (61).
5. The coal ash rolling screen machine according to claim 4, characterized in that: the casing (61) is provided with an opening matched with the second fixing frame, and the second screening assembly (63) is connected with the casing (61) in an inserting mode.
6. The coal ash rolling screen machine according to claim 5, characterized in that: the second screen is detachably connected with the second fixing frame.
7. The coal ash rolling screen machine according to claim 1, characterized in that: the dust cover (2) is arranged outside the rolling screen body (33), the dust cover (2) is fixedly connected with the rack (1), and the dust cover (2) is rotatably connected with the rolling screen body (33) through a bearing; the bottom of the dust cover (2) is communicated with the collecting hopper (22).
8. The coal ash rolling screen machine according to claim 4, characterized in that: the slag discharge end is connected with a crushing mechanism (4), the crushing mechanism (4) comprises a shell (41) and two grinding rollers which are mutually abutted and horizontally and rotatably connected to the shell (41), and one end of each grinding roller is connected with a power assembly which drives the two grinding rollers to rotate oppositely; a conveying mechanism (5) is connected between the bottom of the machine shell (41) and the feeding end.
9. The coal ash rolling screen machine according to claim 8, characterized in that: the conveying mechanism (5) comprises a conveying pipe (52) connected to the bottom of the machine shell (41) and communicated with the feeding end and a fan (51) installed at one end, close to the machine shell (41), of the conveying pipe (52), and airflow blown into the conveying pipe (52) by the fan (51) flows towards the feeding end.
CN201920228148.9U 2019-02-21 2019-02-21 Coal ash rolling screening machine Active CN209810660U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920228148.9U CN209810660U (en) 2019-02-21 2019-02-21 Coal ash rolling screening machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920228148.9U CN209810660U (en) 2019-02-21 2019-02-21 Coal ash rolling screening machine

Publications (1)

Publication Number Publication Date
CN209810660U true CN209810660U (en) 2019-12-20

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Application Number Title Priority Date Filing Date
CN201920228148.9U Active CN209810660U (en) 2019-02-21 2019-02-21 Coal ash rolling screening machine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112439685A (en) * 2020-11-18 2021-03-05 珠海市振业混凝土有限公司 Screening plant of building rubbish preparation recycled aggregate concrete
CN112934409A (en) * 2021-02-01 2021-06-11 安徽东方天合生物技术有限责任公司 Rumen-bypass product processing intermediate material particle progressive screening device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112439685A (en) * 2020-11-18 2021-03-05 珠海市振业混凝土有限公司 Screening plant of building rubbish preparation recycled aggregate concrete
CN112934409A (en) * 2021-02-01 2021-06-11 安徽东方天合生物技术有限责任公司 Rumen-bypass product processing intermediate material particle progressive screening device

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