CN213709044U

CN213709044U - Mixing equipment for plant-mixed hot recycled asphalt mixture

Info

Publication number: CN213709044U
Application number: CN202021996824.6U
Authority: CN
Inventors: 郑志刚; 刘涛; 王涛; 张�浩; 赖鸿生; 黄炳冲; 陈志福
Original assignee: Shenzhen Yuetong Construction Engineering Co ltd
Current assignee: Shenzhen Yuetong Construction Engineering Co ltd
Priority date: 2020-09-12
Filing date: 2020-09-12
Publication date: 2021-07-16
Anticipated expiration: 2030-09-12

Abstract

The utility model relates to a hot regeneration asphalt mixture's of plantmix stirring system equipment, it includes the mount, the mount is used for setting up the transport side of conveyer belt, the feed side of conveyer belt is provided with cold feed bin, the mount deviates from one side of cold feed bin is provided with the drying roller, just the drying roller orientation one side of mount is provided with the feed inlet, the fixed support that is provided with in top of mount, the support internal rotation is provided with the fixed axle, fixed cover is equipped with and is used for scraping on the fixed axle the scraper of the reclaimed materials on conveyer belt surface, just the scraper set up in drying roller's feed inlet one side, be provided with on the support and be used for the drive fixed axle pivoted actuating mechanism. This application has the effect that does benefit to the reclaimed materials of collecting the conveyer belt surface and heat in to the stoving cylinder of rolling.

Description

Mixing equipment for plant-mixed hot recycled asphalt mixture

Technical Field

The application relates to the technical field of recycled asphalt stirring equipment, in particular to mixing equipment for hot recycled asphalt mixture of plants.

Background

The hot regenerating apparatus for asphalt plant is to dig old asphalt road surface and transport it back to mixing plant, crush it, design it according to the quality requirement of different levels of road surface, determine the proportion of old asphalt mixture, mix new asphalt material and new aggregate into new mixture in mixing plant according to a certain proportion, so as to obtain excellent regenerated asphalt concrete, and pave it into regenerated asphalt road surface.

The utility model discloses a hot regeneration system of plantmix of bituminous mixture, including reclaimed material supply equipment, new material supply equipment, mixer, reclaimed material supply equipment includes cold feed bin, drying roller, hoisting device, transition storehouse, first conveyor, second conveyor and third conveyor for the current plantmix hot regeneration bituminous mixture's stirring equipment, authorization notice is CN 207244394U. First conveyor sets up between the output of cold storage bin and the input of drying drum for send into the reclaimed materials in the cold storage bin drying drum and dry the heating, it is specific, first conveyor is the first belt transport mechanism who sets up between cold storage bin and drying drum.

To the above-mentioned correlation technique, because the reclaimed materials in the cold storage storehouse is generally the powdered granule, but the reclaimed materials is easy to adhere to the surface of belt, and then drops to subaerial, causes the waste of reclaimed materials.

SUMMERY OF THE UTILITY MODEL

The application provides a hot reclaimed asphalt mixture's of plantmix stirring equipment is favorable to collecting the reclaimed materials on conveyer belt surface and heating in the stoving cylinder of rolling.

The application provides a mixing equipment of hot reclaimed asphalt mixture of plantmix adopts following technical scheme:

the utility model provides a hot regeneration asphalt mixture's of plantmix stirring equipment, includes the mount, the mount is used for setting up the transport side in the conveyer belt, the feeding side of conveyer belt is provided with cold feed bin, the mount deviates from one side of cold feed bin is provided with drying roller, just drying roller moves towards one side of mount is provided with the feed inlet, the fixed support that is provided with in top of mount, the support internal rotation is provided with the fixed axle, fixed cover is equipped with on the fixed axle and is used for scraping the spatula of the reclaimed material on conveyer belt surface, just the spatula set up in drying roller's feed inlet one side, be provided with on the support and be used for the drive fixed axle pivoted actuating mechanism.

Through adopting above-mentioned technical scheme, the mount is used for setting up the transport side in the conveyer belt, fixed cover is equipped with the spatula that is used for scraping the reclaimed material on conveyer belt surface on the fixed axle, and the spatula sets up in drying roller's feed inlet one side, be provided with on the support and be used for driving fixed axle pivoted actuating mechanism, when the reclaimed material on conveyer belt surface is collected to needs, the staff passes through actuating mechanism drive fixed axle and rotates, the fixed axle drives the spatula swing, the reclaimed material on conveyer belt surface is scraped to the spatula this moment, and fall into drying roller's feed inlet through the spatula, and then be favorable to collecting the reclaimed material on conveyer belt surface and heat in drying roller heat section of thick bamboo.

Optionally, the drive assembly includes the ratchet and is used for driving ratchet pivoted drive assembly, the one end of fixed axle passes the support and extends to outside the support, the ratchet is fixed to be located the fixed axle extends to the one end outside the support, drive assembly set up in on the support.

Through adopting above-mentioned technical scheme, the fixed cover of ratchet is located the one end that the fixed axle extends to outside the support, and drive assembly sets up on the support, and when drive assembly drive ratchet rotated, the ratchet drove the fixed axle and rotates, and the fixed axle drives the scraper swing, and the scraper scrapes the reclaimed materials on conveyer belt surface this moment to fall into the feed inlet of drying drum through the scraper, and then be favorable to collecting the reclaimed materials on conveyer belt surface and heat in the drying drum.

Optionally, the driving assembly comprises a swing rod, an active pawl and a non-return pawl, the support faces towards one side of the ratchet wheel, a swing shaft which is horizontally arranged is fixedly arranged on one side of the ratchet wheel, the swing rod is rotatably arranged at one end, close to the ratchet wheel, of the swing shaft, the ratchet wheel is provided with active teeth and non-return teeth, the active pawl and the non-return pawl are respectively rotatably arranged at one side, facing towards the ratchet wheel, of the swing rod, the active pawl is arranged below the non-return pawl, the active pawl is meshed with the active teeth, the non-return pawl is meshed with the non-return teeth, and the active pawl and the non-return pawl are reset and swing through an elastic piece.

Through adopting above-mentioned technical scheme, the ratchet is provided with drive tooth and non return tooth, drive pawl and non return pawl rotate respectively and set up in one side of pendulum rod towards the ratchet, drive pawl and drive tooth intermeshing, non return pawl and non return tooth intermeshing, drive pawl and non return pawl carry out the swing that resets through an elastic component, when the staff swings the pendulum rod, the pendulum rod drives drive pawl and non return pawl swing, drive pawl drives the ratchet through the drive tooth and rotates, the ratchet drives the fixed axle and rotates, the fixed axle drives the spatula swing, drive pawl and non return pawl reset and respectively with drive tooth and non return tooth intermeshing under the effect of elastic component this moment, and then be favorable to improving the stability of spatula swing.

Optionally, the elastic component is an adjusting spring, the adjusting spring is arranged on one side of the oscillating bar, the ratchet wheel faces the ratchet wheel, the driving pawl faces one side of the support and is provided with a fixed block, the non-return pawl faces one side of the support and is provided with a connecting block, one end of the adjusting spring is connected with the fixed block, the other end of the adjusting spring is connected with the connecting block, and when the adjusting spring is in a natural state, the driving pawl is meshed with the driving teeth, and the non-return pawl is meshed with the non-return teeth.

Through adopting above-mentioned technical scheme, adjusting spring's one end is connected with the fixed block, and adjusting spring's the other end is connected with the connecting block, and when the staff swung the pendulum rod, the pendulum rod drove the swing of initiative pawl, and the initiative pawl drove the ratchet through the initiative tooth and rotates, and the mutual extension adjusting spring of initiative pawl and non return pawl this moment to under adjusting spring's effect, make initiative pawl and non return pawl respectively with initiative tooth and non return tooth intermeshing, and then be favorable to improving ratchet pivoted stability.

Optionally, the spatula includes guide part and connecting portion, the fixed cover of guide part is located the fixed axle, connecting portion fixed set up in the guide part is kept away from one side of fixed axle, the guide part is located drying roller's feed inlet side.

Through adopting above-mentioned technical scheme, the fixed axle is located to the fixed cover of guide part, connecting portion are fixed to be set up in one side that the fixed axle was kept away from to the guide part, the guide part is located the inlet side of drying cylinder, when the fixed axle rotates, the fixed axle drives the guide part swing, the guide part drives the connecting portion swing, and when the scraper scraped the reclaimed material on conveyer belt surface, the reclaimed material dropped the guide part through connecting portion, the feed inlet that drops the drying cylinder through the guide part again, and then be favorable to collecting the reclaimed material on conveyer belt surface and heat in the drying cylinder.

Optionally, a scraping blade for scraping the reclaimed materials on the surface of the conveyor belt is arranged on one side, away from the guide portion, of the connecting portion.

Through adopting above-mentioned technical scheme, connecting portion deviate from guide part one side and are provided with the scraping that is used for scraping the reclaimed materials on conveyer belt surface, are favorable to improving the scraper and scrape the stability of the reclaimed materials on conveyer belt surface.

Optionally, baffles are arranged on two sides of the guide part.

Through adopting above-mentioned technical scheme, the both sides of guide part are provided with the baffle, are favorable to improving the stability in the reclaimed materials landing entering drying roller's that drops on the guide part feed inlet.

Optionally, one side of the drying roller, which is away from the fixing frame, is provided with an air outlet, and the air outlet of the drying roller is communicated with a filtering component used for filtering hot air generated by the drying roller.

Through adopting above-mentioned technical scheme, drying roller's gas vent intercommunication is provided with the filter assembly who is used for filtering drying roller's steam that produces, and drying roller's steam that produces filters through filter assembly and discharges outdoor again, is favorable to reducing environmental pollution.

Optionally, the filtering component is including being used for the extraction draught fan and the sack cleaner of steam in the drying drum, the sack cleaner set up in one side of drying drum, the draught fan set up in the top of sack cleaner, the gas vent of drying drum through a blast pipe with the air intake of draught fan is linked together, the air outlet of draught fan through an outlet duct with the sack cleaner is linked together.

Through adopting above-mentioned technical scheme, the gas vent of drying drum is linked together through the air intake of a blast pipe with the draught fan, and the air outlet of draught fan is linked together through an outlet duct and sack cleaner, and the draught fan passes through the blast pipe with the steam in the drying drum and takes out, and it filters to circulate to remove dust in the sack cleaner through the outlet duct again, and then is favorable to reducing environmental pollution.

In summary, the present application includes at least one of the following beneficial technical effects:

when the reclaimed materials on the surface of the conveying belt need to be collected, a worker drives the fixed shaft to rotate through the driving mechanism, the fixed shaft drives the scraping blade to swing, the scraping blade scrapes the reclaimed materials on the surface of the conveying belt at the moment, the reclaimed materials fall into the feeding hole of the drying roller through the scraping blade, and the reclaimed materials on the surface of the conveying belt are favorably collected and heated in the drying roller.

Drawings

Fig. 1 is a schematic diagram of the overall mechanism of the hot mix plant recycled asphalt mixing apparatus of the present application.

FIG. 2 is a front view of the mixing apparatus for plant heat recovery reclaimed asphalt of the present application.

Fig. 3 is a partial structural schematic view of the stent of the present application.

Fig. 4 is an enlarged view of a portion a of fig. 3.

Description of reference numerals: 1. a cold storage bin; 11. a conveyor belt; 12. drying the roller; 2. a fixed mount; 3. a support; 31. a fixed shaft; 32. a support rod; 4. scraping; 41. a guide portion; 42. a connecting portion; 43. scraping a blade; 44. a baffle plate; 5. a ratchet wheel; 51. a non-return tooth; 52. a driving tooth; 6. a swing rod; 61. a connecting rod; 62. a swing shaft; 63. a rotating shaft; 7. an active pawl; 71. a non-return pawl; 72. a fixed block; 73. connecting blocks; 8. adjusting the spring; 9. an induced draft fan; 91. an exhaust pipe; 92. an air outlet pipe; 93. a bag-type dust collector.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Example (b):

referring to fig. 1 and 2, the mixing equipment for the plant-mixed hot recycled asphalt mixture comprises a fixed frame 2, wherein the fixed frame 2 is used for being erected on the conveying side of a conveying belt 11. The opposite side of drive belt is the feed side, and the feed side is provided with cold feed bin 1, and 11 delivery sides of conveyer belt are provided with drying drum 12, and drying drum 12 erects in subaerial, and drying drum 12 is located one side that mount 2 deviates from cold feed bin 1. Drying drum 12 is provided with the feed inlet, and cold feed bin 1 erects subaerially, and cold feed bin 1 is used for the storage aggregate of regenerating, and the bottom of cold feed bin 1 is provided with the discharge gate, and the aggregate of regenerating drops conveyer belt 11 through the discharge gate, and the stoving heating is carried to drying drum 12 with the aggregate of regenerating again through conveyer belt 11.

The fixed support 3 that is provided with in top of mount 2, support 3 include two landing legs, and two landing legs are vertical setting, and two landing legs are fixed to be set up in the top of mount 2, and one side that two landing legs are relative rotates and is provided with fixed axle 31, and fixed cover is equipped with the spatula 4 that is used for scraping the reclaimed materials on 11 surfaces of conveyer belt on the fixed axle 31, and spatula 4 sets up in the top of the feed inlet of drying drum 12. The supporting legs are provided with a driving mechanism for driving the fixed shaft 31 to rotate.

In particular, referring to fig. 3 and 4, the drive mechanism includes a ratchet 5 and a drive assembly for driving the ratchet 5 in rotation. One end of the fixed shaft 31 penetrates through the supporting leg and extends out of the side wall of the supporting leg, and the ratchet wheel 5 is coaxially fixed and sleeved at one end of the fixed shaft 31 extending out of the side wall of the supporting leg. The drive assembly is disposed on one of the legs adjacent the ratchet 5.

Referring to fig. 3 and 4, the driving assembly includes a swing link 6, an active pawl 7, and a check pawl 71. The ratchet wheel 5 is provided with non-return teeth 51 on the outside and drive teeth 52 on the inside of the ratchet wheel 5. A connecting rod 61 is fixedly arranged at the top of the supporting leg close to the ratchet wheel 5, a swinging shaft 62 is fixedly arranged at one side of the connecting rod 61 facing the ratchet wheel 5, the swinging shaft 62 is horizontally arranged, and the swinging rod 6 is rotatably arranged at one end of the swinging shaft 62 facing the ratchet wheel 5. The driving pawl 7 and the non-return pawl 71 are respectively rotatably arranged on one side of the swing rod 6 facing the ratchet 5 through a rotating shaft 63, the driving pawl 7 is positioned below the non-return pawl 71, the driving pawl 7 is meshed with the driving teeth 52, and the non-return pawl 71 is meshed with the non-return teeth 51.

In order to improve the stability of the engagement between the driving pawl 7 and the non-return pawl 71 and the driving tooth 52 and the non-return tooth 51, respectively, the driving pawl 7 and the non-return pawl 71 are reset and swung by an elastic member, which is an adjusting spring 8. One side of the driving pawl 7 facing the support 3 is provided with a fixed block 72, one side of the non-return pawl 71 facing the support 3 is provided with a connecting block 73, one end of the adjusting spring 8 is fixedly connected with the fixed block 72, the other end of the adjusting spring 8 is fixedly connected with the connecting block 73, when a worker swings the swing rod 6, the swing rod 6 drives the driving pawl 7 and the non-return pawl 71 to swing, the driving pawl 7 drives the ratchet wheel 5 to rotate through the driving tooth 52, the ratchet wheel 5 drives the fixed shaft 31 to rotate, the fixed shaft 31 drives the spatula 4 to swing, the non-return pawl 71 swings on the non-return tooth 51 at the moment, and the driving pawl 7 and the non-return pawl. When the operator resets the rocker 6, the adjusting spring 8 returns to its natural state and simultaneously engages the driving pawl 7 and the non-return pawl 71 with the driving tooth 52 and the non-return tooth 51, respectively.

Specifically, referring to fig. 3, in order to improve the stable collection of the reclaimed materials scraped off by the scraper 4 into the feed opening of the drying drum 12, the scraper 4 assembly includes a guide portion 41 and a connecting portion 42. One side of the guiding part 41 is fixedly sleeved on the fixed shaft 31, and the guiding part 41 is close to the feeding hole of the drying roller 12. The connecting portion 42 is fixedly connected with one side of the guiding portion 41 far away from the fixing shaft 31, and a scraping blade 43 is fixedly arranged at one end of the connecting portion 42 far away from the fixing shaft 31, when the fixing shaft 31 rotates, the fixing shaft 31 drives the guiding portion 41 to swing towards the direction close to the drying roller 12, the guiding portion 41 drives the connecting portion 42 to swing towards the direction close to the drying roller 12, the connecting portion 42 drives the scraping blade 43 to swing towards the direction close to the drying roller 12, at this time, the scraping blade 43 abuts against the surface of the conveyor belt 11, further, the scraping blade 43 scrapes the reclaimed materials on the surface of the conveyor belt 11, at this time, the reclaimed materials drop to the guiding portion 41 through the connecting portion 42, and.

It should be noted that, referring to fig. 3, the baffles 44 are fixedly disposed on both sides of the guide portion 41, which is beneficial to reduce the falling of the reclaimed materials from both sides of the guide portion 41, and is further beneficial to improve the stability of the reclaimed materials scraped to the guide portion 41 sliding into the feed inlet of the drying drum 12. The two inner sides of the supporting legs are fixedly provided with the supporting rods 32, the supporting rods 32 are horizontally arranged, when the guide part 41 swings towards the direction of the drying roller 12, one side of the guide part 41 abuts against the supporting rods 32, and the stability of the swing of the guide part 41 is improved.

Specifically, referring to fig. 1 and 2, since the drying drum 12 generates a large amount of hot air during operation, the hot air contains polluted gas, an exhaust port is disposed on one side of the drying drum 12 away from the fixing frame 2, and the exhaust port of the drying drum 12 is communicated with a filter layer assembly for filtering the hot air generated by the drying drum 12. The filtering component comprises an induced draft fan 9 and a bag-type dust collector 93, the bag-type dust collector 93 is fixedly arranged on one side of the drying drum 12, and the induced draft fan 9 is arranged at the top of the bag-type dust collector 93. An exhaust pipe 91 is communicated with an exhaust port of the drying roller 12, and the other end of the exhaust pipe 91 is communicated with an air inlet of the induced draft fan 9. An air outlet pipe 92 is communicated with an air outlet of the induced draft fan 9, and the other end of the air outlet pipe 92 is communicated with a bag-type dust collector 93. When hot gas is required to be filtered, the worker starts the induced draft fan 9, and the induced draft fan 9 filters the hot gas in the bag-type dust collector 93 through the exhaust pipe 91 and the air outlet pipe 92, so that the emission of the hot gas and the pollution to the environment are reduced.

The working principle of the mixing equipment for the plant-mixed hot recycled asphalt mixture is as follows:

when the reclaimed materials on the surface of the conveyor belt 11 need to be collected, a worker firstly swings the swing rod 6, the swing rod 6 drives the driving pawl 7 and the non-return pawl 71 to swing, the driving pawl 7 drives the ratchet wheel 5 to rotate through the driving tooth 52, the ratchet wheel 5 drives the fixed shaft 31 to rotate, the fixed shaft 31 drives the spatula 4 to swing, at the moment, the non-return pawl 71 swings on the non-return tooth 51, and the driving pawl 7 and the non-return pawl 71 mutually stretch the adjusting spring 8. The ratchet wheel 5 drives the fixed shaft 31 to rotate, the fixed shaft 31 drives the guide part 41 to swing, the guide part 41 drives the connecting part 42 to swing, the connecting part 42 drives the scraping blade 43 to swing, and the scraping blade 43 abuts against the surface of the conveyor belt 11 at the moment.

When the worker resets the swing rod 6, the adjusting spring 8 is restored to the natural state, the driving pawl 7 and the non-return pawl 71 are respectively meshed with the driving tooth 52 and the non-return tooth 51, and the spatula 4 is fixed at the current position due to the fact that the driving pawl 7, the non-return pawl 71 and the ratchet wheel 5 have unidirectionality.

In conclusion, the scraper 4 scrapes the reclaimed materials on the surface of the conveyor belt 11 and the reclaimed materials fall into the feeding hole of the drying roller 12 through the scraper 4, so that the reclaimed materials on the surface of the conveyor belt 11 can be collected and heated in the drying roller.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The mixing equipment for the plant-mixed hot recycled asphalt mixture is characterized by comprising the following steps of: comprises a fixed frame (2), the fixed frame (2) is used for being arranged on the conveying side of a conveying belt (11), a cold storage bin (1) is arranged at the feeding side of the conveyor belt (11), a drying roller (12) is arranged at one side of the fixing frame (2) deviating from the cold storage bin (1), and one side of the drying roller (12) facing the fixed frame (2) is provided with a feeding hole, the top of the fixed frame (2) is fixedly provided with a bracket (3), the bracket (3) is rotatably provided with a fixed shaft (31), a scraping shovel (4) for scraping the reclaimed materials on the surface of the conveyor belt (11) is fixedly sleeved on the fixed shaft (31), and the scraping shovel (4) is arranged on one side of the feed inlet of the drying roller (12), and a driving mechanism for driving the fixed shaft (31) to rotate is arranged on the bracket (3).

2. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 1, characterized in that: the driving mechanism comprises a ratchet wheel (5) and a driving assembly used for driving the ratchet wheel (5) to rotate, one end of a fixing shaft (31) penetrates through the support (3) and extends to the outside of the support (3), the ratchet wheel (5) is fixedly sleeved at one end of the fixing shaft (31) extending to the outside of the support (3), and the driving assembly is arranged on the support (3).

3. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 2, characterized in that: the driving component comprises a swing rod (6), an active pawl (7) and a non-return pawl (71), a swing shaft (62) which is horizontally arranged is fixedly arranged on one side of the bracket (3) facing the ratchet wheel (5), the swing rod (6) is rotatably arranged at one end of the swing shaft (62) close to the ratchet wheel (5), the ratchet wheel (5) is provided with a driving tooth (52) and a non-return tooth (51), the driving pawl (7) and the non-return pawl (71) are respectively and rotatably arranged on one side of the swing rod (6) facing the ratchet wheel (5), and the active pawl (7) is arranged below the non-return pawl (71), and the driving pawl (7) is meshed with the driving tooth (52), the non-return pawl (71) is meshed with the non-return tooth (51), the active pawl (7) and the non-return pawl (71) are subjected to reset oscillation through an elastic piece.

4. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 3, characterized in that: the elastic component is adjusting spring (8), adjusting spring (8) set up in ratchet (5) orientation one side of pendulum rod (6), initiative pawl (7) orientation one side of support (3) is provided with fixed block (72), non return pawl (71) orientation one side of support (3) is provided with connecting block (73), just the one end of adjusting spring (8) with fixed block (72) fixed connection, the other end of adjusting spring (8) with connecting block (73) fixed connection, work as when adjusting spring (8) is in the natural state, initiative pawl (7) with initiative tooth (52) intermeshing, non return pawl (71) with non return tooth (51) intermeshing.

5. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 1, characterized in that: spatula (4) include guide part (41) and connecting portion (42), guide part (41) are fixed to be located fixed axle (31), connecting portion (42) are fixed set up in guide part (41) are kept away from one side of fixed axle (31), guide part (41) are located the feed inlet side of drying roller (12).

6. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 5, wherein: and a scraping blade (43) for scraping the reclaimed materials on the surface of the conveyor belt (11) is arranged on one side of the connecting part (42) departing from the guide part (41).

7. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 6, wherein: baffles (44) are arranged on two sides of the guide part (41).

8. The plant-mixed hot recycled asphalt mixture mixing equipment according to claim 5, wherein: one side of the drying roller (12) departing from the fixing frame (2) is provided with an air outlet, and the air outlet of the drying roller (12) is communicated with a filtering component used for filtering hot air generated by the drying roller (12).

9. The plant-mixed hot recycled asphalt mixing plant according to claim 8, wherein: the filtering component is including being used for the extraction draught fan (9) and sack cleaner (93) of the steam in drying drum (12), sack cleaner (93) set up in one side of drying drum (12), draught fan (9) set up in the top of sack cleaner (93), the gas vent of drying drum (12) through a blast pipe (91) with the air intake of draught fan (9) is linked together, the air outlet of draught fan (9) through an outlet duct (92) with sack cleaner (93) are linked together.