CN213377118U - Stirring formula air current grinds broken sieve powder device - Google Patents

Abstract

The utility model relates to a sieve powder technical field, in particular to stirring formula air current grinds broken sieve powder device, including fixed body frame, fixed body frame is including first body frame, second body frame and third body frame, first body frame, second body frame and third body frame turn right from a left side and set gradually according to the order, be provided with the corase grind device on the first body frame, be provided with the air current and grind the device on the second body frame, be provided with stirring sieve powder device on the third body frame, be provided with first passage and second passage between corase grind device and the air current and grind the device, be provided with between air current and grind device and the stirring sieve powder device respectively, third body frame below is provided with the collecting box. The utility model relates to a novelty, it is rational in infrastructure, have the dual crocus mode of mechanical mill and jet mill, sieve whitewashed device still has agitating unit simultaneously, the result of use is better.

Description

Stirring formula air current grinds broken sieve powder device

Technical Field

The utility model relates to a sieve powder technical field, in particular to stirring formula air current grinds sieve powder device that breaks up.

Background

The sieve powder device that uses at present only reaches the purpose of sieve powder through the vibrator vibration, but powder efficiency is slower under this kind of sieve powder device, also pile up the jam very easily, still need find corresponding milling equipment specially and carry out the crocus when meetting some unqualified likepowder objects moreover, make it reach the certified products through regrinding, this kind of independent operation work efficiency is lower, it is consuming time longer through a milling equipment when meetting a large amount of unqualified products, customer's user demand can not be satisfied. Therefore, a stirring type airflow mill crushing and screening device is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rational in infrastructure, convenient to use's a stirring formula air current grinds broken sieve powder device to prior art's defect and not enough.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

The utility model relates to an agitating type airflow grinding crushing and powder sieving device, which comprises a fixing main frame, wherein the fixing main frame comprises a first main frame, a second main frame and a third main frame, the first main frame, the second main frame and the third main frame are sequentially arranged from left to right, a coarse grinding device is arranged on the first main frame, the coarse grinding device comprises a coarse grinding box body, the top of the coarse grinding box body is provided with a first feed hopper, the right side wall of the coarse grinding box body is provided with a discharge hole, the inner cavity of the coarse grinding box body is transversely provided with a baffle plate and divides the inner space of the coarse grinding box body into an upper grinding cavity and a lower placing cavity by taking the baffle plate as a boundary, the upper end of the inner cavity of the upper grinding cavity is provided with a guide ring seat, the lower part of the guide ring seat is provided with a central shaft, the outer side of the central shaft is sleeved with a rotor disc, the outer side of the rotor disc is provided, the second main frame is provided with an airflow grinding device, the airflow grinding device comprises a barrel body, the top of the barrel body is provided with a turbine classifier, one side of the turbine classifier is provided with a discharging pipe, one side of the middle of the barrel body is provided with a first feeding pipe, a compressed air inlet pipe is arranged below the first feeding pipe, a modifier injection atomizing nozzle is arranged below the compressed air inlet pipe, an opposite impact type crushing nozzle is arranged below the modifier injection atomizing nozzle, the bottom of the barrel body is provided with an annular pipe seat, the inner side and the outer side of the annular pipe seat are respectively provided with a crushing nozzle and a pressure air source quick connector, the third main frame is provided with a stirring and powder screening device, the stirring and powder screening device comprises a stirring box and a classification collecting box, the center of the top of the stirring box is provided with a stirring device, one side of the stirring device is provided with a second feeding pipe, and one side, the inside first rack that is provided with of agitator tank, and first rack below is provided with the second rack, be provided with the material discharge pipe on the categorised collecting box lateral wall, categorised collecting box embeds there is the screen cloth of putting to one side, and puts the screen cloth below to one side and be provided with the flat net seat of putting, be provided with first passage and second passage between corase grind device and the air current mill device, between air current mill device and the stirring sieve powder device respectively, third body frame below is provided with the collecting box.

Further, first body frame, second body frame and third body frame design for integrated into one piece, first body frame, second body frame and third body frame height turn right from a left side and reduce in proper order, all be provided with respectively with the installation hole site of air current mill device and stirring sieve powder device looks adaptation on second body frame and the third body frame.

Further, first feeder hopper and bin outlet one end are linked together with corase grind box inner chamber respectively, center pin one end sets up in the rotor dish top and is provided with the spacer ring cover, and the other end runs through the rotor dish and puts the chamber roof under and with grinding motor's output fixed connection, be provided with the rotor shaft in the rotor dish, it is epaxial to grind hammer one end fixed connection rotor, on grind and be provided with the limit backplate on the intracavity wall, and equidistant counterattack welt that is provided with on the limit backplate, adjacent two sets of all be provided with the grid section between the counterattack welt, on grind the intracavity wall and be provided with elementary screen cloth with the corresponding department in bin outlet position.

Furthermore, the top of the barrel is connected with the lower end of a turbine classifier through a flange and a bolt, a turbine cavity of the turbine classifier is communicated with an inner cavity of the barrel, the discharge pipe is fixed on the lateral part of the turbine classifier through welding, the discharge pipe is communicated with an output port of the turbine classifier, the first feed pipe is fixed with the barrel through welding and communicated with the inner cavity of the barrel, the modifier injection atomizing nozzle and the hedging type crushing nozzle are arranged on the outer wall of the barrel at equal intervals in a surrounding mode, one end of the modifier injection atomizing nozzle penetrates through the outer wall of the barrel and extends to the inner cavity of the barrel, the modifier injection atomizing nozzle is arranged at a position close to the upper part of the hedging type crushing nozzle, the compressed air inlet pipe is fixedly connected with a plurality of hedging type crushing nozzles through branch pipes respectively, the annular pipe seat is fixed on the outer side of the bottom of the barrel through welding, the other end of the pressure air source quick connector is communicated with the inner cavity of the annular tube seat, and the pressure air source quick connector is in threaded connection with the annular tube seat and is communicated with the inner cavity of the annular tube seat.

Further, the agitator tank is a tapered cavity with a large upper part and a small lower part, one end of the second inlet pipe is communicated with the inner cavity of the agitator tank, the stirring device comprises a stirring motor, a stirring shaft and a stirring plate, one end of the stirring shaft is positioned at the bottom of the second net rack and is rotationally connected with the bottom of the second net rack, the other end of the stirring shaft penetrates through the second net rack, the first net rack and the top cover of the agitator tank and is fixedly connected with the output end of the stirring motor arranged on the top cover of the agitator tank, the stirring plate is sleeved on the stirring shaft and is respectively positioned above the first net rack and the second net rack, the diameter of the first net rack is larger than that of the second net rack, one end of the material discharge pipe is communicated with the inner cavity of the classification collection box and corresponds to the inclined screen, the inclined screen is an inverted V-shaped screen and is provided with two, the horizontal screen mesh is arranged in the horizontal screen mesh seat, and the bottom of the horizontal screen mesh seat is provided with a conical discharging pipe.

Further, the aperture of the sieve pores on the inclined sieve mesh is gradually reduced from top to bottom in sequence, and the aperture of the horizontally arranged sieve mesh is smaller than that of the inclined sieve mesh.

Further, first passage one end is connected with the bin outlet, and the other end is connected with first inlet pipe.

Furthermore, second passage one end is connected with the discharging pipe, and the other end is connected with the second inlet pipe, be provided with cyclone and dust remover between second passage and the discharging pipe.

The utility model discloses beneficial effect does:

(1) the utility model relates to a novelty, it is rational in infrastructure, solved the problem that the customer proposed, improved work efficiency.

(2) Compare with traditional device, this device has set up agitating unit on the basis of vibrator, reduces the material through setting up dual stirring and piles up the jam that causes and improve sieve powder efficiency, and the result of use is better.

(3) Compared with the traditional device, this device has set up corase grind device and air current and has ground the device, and corase grind device, air current grind device and stirring sieve powder device design as an organic whole, reduce the time that the process butt joint was walked around of making a round trip, improve work efficiency, and this device collects mechanical mill and air current simultaneously and grinds as an organic wholely, and two mills design crocus quality is better, has also reduced single milling equipment work load, improves production efficiency.

Drawings

FIG. 1 is a schematic structural view of an agitating type airflow grinding and pulverizing sieve device of the present invention;

FIG. 2 is a schematic structural view of a rough grinding device in an agitated air flow mill crushing and screening device of the present invention;

FIG. 3 is a schematic structural view of an air mill device in an agitating type air mill crushing and sieving device according to the present invention;

fig. 4 is a schematic structural view of a stirring sieve powder device in the stirring type airflow mill crushing sieve powder device of the utility model.

In FIGS. 1-4: 1. fixing the main frame; 2. a first main frame; 3. a second main frame; 4. a third main frame; 5. a rough grinding device; 51. coarsely grinding a box body; 52. a first feed hopper; 53. a discharge outlet; 54. an upper grinding chamber; 55. a lower placing cavity; 56. a material guiding ring seat; 57. a central shaft; 58. a rotor disk; 59. grinding a hammer; 510. grinding the motor; 6. an air-jet mill device; 61. a barrel; 62. a turbine classifier; 63. a discharge pipe; 64. a first feed tube; 65. a compressed air inlet pipe; 66. the modifier is used for ejecting the atomizing nozzle; 67. a counter-impact type crushing nozzle; 68. an annular tube seat; 69. a pulverizing nozzle; 610. a pressure gas source quick connector; 7. a powder stirring and screening device; 71. a stirring box; 72. a classification collecting box; 73. a stirring device; 74. a second feed tube; 75. a vibration motor; 76. a first net frame; 77. a second net rack; 78. a material discharge pipe; 79. obliquely arranging a screen; 710. horizontally placing a net seat; 8. a first material guide pipe; 9. a second material guide pipe; 10 collecting box.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the stirring type airflow grinding crushing sieving device of the present invention comprises a fixing main frame 1, the fixing main frame 1 comprises a first main frame 2, a second main frame 3 and a third main frame 4, the first main frame 2, the second main frame 3 and the third main frame 4 are sequentially arranged from left to right, a rough grinding device 5 is arranged on the first main frame 2, the rough grinding device 5 comprises a rough grinding box body 51, a first feeding hopper 52 is arranged on the top of the rough grinding box body 51, a discharging opening 53 is arranged on the right side wall of the rough grinding box body 51, a partition board is transversely arranged in the inner cavity of the rough grinding box body 51 and divides the inner space of the rough grinding box body 51 into an upper grinding cavity 54 and a lower placing cavity 55 by taking the partition board as a boundary, a material guiding ring seat 56 is arranged on the upper end of the inner cavity of the upper grinding cavity 54, a central shaft 57 is arranged below the guiding ring seat 56, a rotor disc 58 is arranged outside the central shaft 57, and a grinding hammer, the lower placing cavity 55 is internally provided with a grinding motor 510, the second main frame 3 is provided with an airflow grinding device 6, the airflow grinding device 6 comprises a cylinder body 61, the top of the cylinder body 61 is provided with a turbine classifier 62, one side of the turbine classifier 62 is provided with a discharge pipe 63, one side of the middle part of the cylinder body 61 is provided with a first feed pipe 64, a compressed air inlet pipe 65 is arranged below the first feed pipe 64, a modifier injection atomizing nozzle 66 is arranged below the compressed air inlet pipe 65, a hedging type crushing nozzle 67 is arranged below the modifier injection atomizing nozzle 66, the bottom of the cylinder body 61 is provided with an annular pipe seat 68, the inner side and the outer side of the annular pipe seat 68 are respectively provided with a crushing nozzle 69 and a pressure air source quick connector 610, the third main frame 4 is provided with a stirring and powder sieving device 7, the stirring and powder sieving device 7 comprises a stirring box 71 and a classification collecting box 72, the center of, a second feeding pipe 74 is arranged on one side of the stirring device 73, a vibrating motor 75 is arranged on one side of the stirring box 71, a first net rack 76 is arranged in the stirring box 71, a second net rack 77 is arranged below the first net rack 76, a material discharging pipe 78 is arranged on the outer side wall of the classification collecting box 72, an inclined screen 79 is arranged in the classification collecting box 72, a flat screen seat 710 is arranged below the inclined screen 79, a first material guiding pipe 8 and a second material guiding pipe 9 are respectively arranged between the coarse grinding device 5 and the airflow grinding device 6 and between the airflow grinding device 6 and the stirring powder screening device 7, and a collecting box 10 is arranged below the third main frame 4.

Wherein, the first main frame 2, the second main frame 3 and the third main frame 4 are designed as an integrated body, the heights of the first main frame 2, the second main frame 3 and the third main frame 4 are sequentially reduced from left to right, the second main frame 3 and the third main frame 4 are respectively provided with an installation hole site which is respectively matched with the air flow grinding device 6 and the stirring powder sieving device 7, one end of the first feed hopper 52 and one end of the discharge port 53 are respectively communicated with the inner cavity of the rough grinding box body 51, one end of the central shaft 57 is arranged above the rotor disc 58 and is provided with a spacer ring sleeve, the other end penetrates through the top walls of the rotor disc 58 and the lower placement cavity 55 and is fixedly connected with the output end of the grinding motor 510, the rotor disc 58 is internally provided with a rotor shaft, one end of the grinding hammer 59 is fixedly connected with the rotor shaft, the inner wall of the upper grinding cavity 54 is provided with an edge protection plate, the edge protection plates are equidistantly provided with counterattack, the inner wall of the upper grinding cavity 54 is provided with a primary screen at a position corresponding to the position of the discharge port 53, the top of the cylinder 61 is connected with the lower end of the turbine classifier 62 through a flange and a bolt, the turbine cavity of the turbine classifier 62 is communicated with the inner cavity of the cylinder 61, a discharge pipe 63 is fixed on the side part of the turbine classifier 62 through welding, the discharge pipe 63 is communicated with the output port of the turbine classifier 62, a first feed pipe 64 is fixed with the cylinder 61 through welding and communicated with the inner cavity of the cylinder 61, modifier injection atomizing nozzles 66 and opposite impact type crushing nozzles 67 are arranged on the outer wall of the cylinder 61 at equal intervals, one end of the modifier injection atomizing nozzles penetrates through the outer wall of the cylinder 61 and extends to the inner cavity of the cylinder 61, the modifier injection atomizing nozzles 66 are arranged at a position close to the upper part of the opposite impact type crushing nozzles 67, a compressed air inlet pipe 65 is respectively fixedly connected with a plurality, the crushing nozzles 69 are in multiple groups, one end of each crushing nozzle is communicated with the inner cavity of the cylinder 61, the other end of each crushing nozzle is communicated with the inner cavity of the annular tube seat 68, the pressure air source quick connector 610 is in threaded connection with the annular tube seat 68 and is communicated with the inner cavity of the annular tube seat 68, the stirring box 71 is a tapered cavity with a large upper part and a small lower part, one end of the second feeding tube 74 is communicated with the inner cavity of the stirring box 71, the stirring device 73 comprises a stirring motor, a stirring shaft and a stirring plate, one end of the stirring shaft is positioned at the bottom of the second net rack 77 and is rotationally connected with the bottom of the second net rack 77, the other end of the stirring shaft penetrates through the second net rack 77, the first net rack 76 and the top cover of the stirring box 71 and is fixedly connected with the output end of the stirring motor arranged on the top cover of the stirring box 71, the stirring plate is sleeved on the stirring shaft and is respectively positioned above, the inclined screen mesh 79 is an inverted V-shaped screen mesh and is provided with at least two groups, the inclined screen mesh 79 is equal in number to the material discharge pipe 78 and communicated with the material discharge pipe, a flat screen mesh is arranged inside the flat screen seat 710, a conical discharge pipe is arranged at the bottom of the flat screen seat 710, the aperture of screen holes on the inclined screen mesh 79 is sequentially and gradually reduced from top to bottom, the aperture of the flat screen mesh is smaller than that of the inclined screen mesh 79, one end of the first material guide pipe 8 is connected with the discharge port 53, the other end of the first material guide pipe is connected with the first material feed pipe 64, one end of the second material guide pipe 9 is connected with the material discharge pipe 63, the other end of the second material guide pipe 9 is connected with the second material feed pipe 74.

The working principle is as follows: when the device is used, when unqualified powder objects need to be ground again, firstly, the unqualified powder objects are put into the coarse grinding device 5, the unqualified powder objects enter the coarse grinding device 5 to be ground through the impact of the grinding hammer 59 rotating at high speed, the ground raw materials obtain kinetic energy from the hammer head and impact the impact lining plate and the grate on the inner wall of the grinding cavity 54 at high speed to be ground again, then the unqualified powder objects smaller than the gaps of the grate are discharged from the gaps, filtered by the primary screen and then discharged out of the discharge outlet 53, the unqualified powder objects enter the air flow grinding device 6 through the first material guide pipe 8, the unqualified powder objects (when being ground and modified, the modifier is simultaneously sprayed by the modifier injection atomizing nozzles 66) are ground through the gas sprayed by the multiple groups of opposite impact type grinding nozzles 67 and the multiple groups of grinding nozzles 69, and the smashed unqualified powder objects enter the turbine classifier 62 under the action of the gas, then the powder is discharged from the discharging pipe 63, and the powder after being ground by the rough grinding device 5 and the airflow grinding device 6 is changed into qualified product, enters the stirring and sieving device 7 through the second material guiding pipe 9, and is classified and collected for use through the inclined screen 79 and the flat screen under the action of the stirring device 73 and the vibrating motor 75.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims (8)

1. The utility model provides an agitating type air current grinds broken sieve powder device, includes fixed body frame (1), its characterized in that: the fixed main frame (1) comprises a first main frame (2), a second main frame (3) and a third main frame (4), the first main frame (2), the second main frame (3) and the third main frame (4) are sequentially arranged from left to right, a rough grinding device (5) is arranged on the first main frame (2), the rough grinding device (5) comprises a rough grinding box body (51), a first feed hopper (52) is arranged at the top of the rough grinding box body (51), a discharge opening (53) is arranged on the right side wall of the rough grinding box body (51), a partition board is transversely arranged in the inner cavity of the rough grinding box body (51) and divides the inner space of the rough grinding box body (51) into an upper grinding cavity (54) and a lower placing cavity (55) by taking the partition board as a boundary, a guide ring seat (56) is arranged at the upper end of the inner cavity of the upper grinding cavity (54), and a central shaft (57) is arranged below the guide ring seat (56), a rotor disc (58) is sleeved on the outer side of the central shaft (57), a grinding hammer (59) is arranged on the outer side of the rotor disc (58), a grinding motor (510) is arranged in the lower placing cavity (55), an airflow grinding device (6) is arranged on the second main frame (3), the airflow grinding device (6) comprises a cylinder body (61), a turbine classifier (62) is arranged at the top of the cylinder body (61), a discharge pipe (63) is arranged on one side of the turbine classifier (62), a first feed pipe (64) is arranged on one side of the middle of the cylinder body (61), a compressed air inlet pipe (65) is arranged below the first feed pipe (64), a modifier injection and atomization nozzle (66) is arranged below the compressed air inlet pipe (65), a hedging type crushing nozzle (67) is arranged below the modifier injection and atomization nozzle (66), and an annular pipe seat (68) is arranged at the bottom of the cylinder body (61), and the inner side and the outer side of the annular tube seat (68) are respectively provided with a crushing nozzle (69) and a pressure air source quick connector (610), the third main frame (4) is provided with a stirring and powder screening device (7), the stirring and powder screening device (7) comprises a stirring box (71) and a classification collecting box (72), the center of the top of the stirring box (71) is provided with a stirring device (73), one side of the stirring device (73) is provided with a second feeding pipe (74), one side of the stirring box (71) is provided with a vibrating motor (75), a first net rack (76) is arranged in the stirring box (71), a second net rack (77) is arranged below the first net rack (76), the outer side wall of the classification collecting box (72) is provided with a material discharge pipe (78), the classification collecting box (72) is internally provided with an inclined screen (79), and a flat net rack (710) is arranged below the inclined screen (79), a first material guide pipe (8) and a second material guide pipe (9) are respectively arranged between the coarse grinding device (5) and the airflow grinding device (6) and between the airflow grinding device (6) and the stirring powder sieving device (7), and a collecting box (10) is arranged below the third main frame (4).

2. The stirring type airflow grinding, crushing and powder screening device of claim 1, is characterized in that the first main frame (2), the second main frame (3) and the third main frame (4) are designed to be integrally formed, the heights of the first main frame (2), the second main frame (3) and the third main frame (4) are sequentially reduced from left to right, and mounting hole positions respectively matched with the airflow grinding device (6) and the stirring and powder screening device (7) are respectively arranged on the second main frame (3) and the third main frame (4).

3. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: first feeder hopper (52) and bin outlet (53) one end are linked together with corase grind box (51) inner chamber respectively, center pin (57) one end sets up in rotor dish (58) top and is provided with the spacer ring cover, and the other end runs through rotor dish (58) and puts down chamber (55) roof and with the output fixed connection of grinding motor (510), be provided with the rotor shaft in rotor dish (58), grind on hammer (59) one end fixed connection rotor shaft, it is provided with the limit backplate on grinding chamber (54) inner wall, and the equidistant counterattack welt that is provided with on the limit backplate, adjacent two sets of all be provided with the grid section between the counterattack welt, it is provided with elementary screen cloth with bin outlet (53) corresponding department in position to go up grinding chamber (54) inner wall.

4. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: the top of barrel (61) is connected with the lower extreme of turbine classifier (62) through flange and bolt, the turbine chamber and barrel (61) inner chamber of turbine classifier (62) are linked together, lateral part in turbine classifier (62) is passed through welded fastening in discharging pipe (63), discharging pipe (63) are linked together with the delivery outlet of turbine classifier (62), first inlet pipe (64) and barrel (61) welded fastening and are linked together with barrel (61) inner chamber, modifier injection atomizing nozzle (66) and hedging formula crushing nozzle (67) equidistance encircle to set up on barrel (61) outer wall and one end runs through barrel (61) outer wall and extend to barrel (61) inner chamber, modifier injection atomizing nozzle (66) set up in the position of hedging formula crushing nozzle (67) upper portion next-door neighbour, compressed air intake pipe (65) are through the branch pipe respectively with multiunit hedging formula crushing nozzle (67) fixed connection, annular tube socket (68) welded fastening is in barrel (61) bottom outside, smash nozzle (69) and be the multiunit and wherein one end is linked together with barrel (61) inner chamber, and the other end is linked together with annular tube socket (68) inner chamber, pressurized air source quick-operation joint (610) and annular tube socket (68) threaded connection and be linked together with annular tube socket (68) inner chamber.

5. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: agitator tank (71) is big-end-up's taper cavity, second inlet pipe (74) one end is linked together with agitator tank (71) inner chamber, agitating unit (73) are including agitator motor, (mixing) shaft and stirring board, (mixing) shaft one end is located second rack (77) bottom and rotates with second rack (77) bottom to be connected, and the other end runs through second rack (77), first rack (76) and agitator tank (71) top cap and with the output fixed connection who sets up agitator motor on agitator tank (71) top cap, the stirring board cover is established on the (mixing) shaft and is located first rack (76) and second rack (77) top respectively, first rack (76) diameter size is greater than second rack (77) diameter size, material discharge pipe (78) one end is linked together with categorised collecting box (72) inner chamber and is put screen cloth (79) position corresponding to one side, the inclined screens (79) are inverted V-shaped screens and are at least provided with two groups, the inclined screens (79) are equal in number to the material discharge pipes (78) and communicated with the material discharge pipes, the horizontal screens are arranged in the horizontal screen seat (710), and a conical discharge pipe is arranged at the bottom of the horizontal screen seat (710).

6. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: the mesh apertures on the inclined screen (79) are sequentially and gradually reduced from top to bottom, and the aperture of the horizontally arranged screen is smaller than that of the inclined screen (79).

7. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: one end of the first material guide pipe (8) is connected with the discharge opening (53), and the other end of the first material guide pipe is connected with the first feeding pipe (64).

8. The agitator type air flow mill pulverizer mill apparatus according to claim 1, wherein: one end of the second material guiding pipe (9) is connected with the material discharging pipe (63), the other end of the second material guiding pipe is connected with the second material feeding pipe (74), and a cyclone separator and a dust remover are arranged between the second material guiding pipe (9) and the material discharging pipe (63).

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