CN218155144U - Master batch drying system - Google Patents

Abstract

The utility model discloses a master batch drying system, which comprises a tank body, the hopper, first drying device, dust collector and second drying device, the feed opening of hopper bottom is linked together with the pan feeding mouth that sets up on the jar body down, first drying device, second drying device and dust collector are linked together with jar internal portion respectively, be used for drying and removing dust the master batch that gets into jar internal, first drying device is including first drying tray, second drying tray and heat source device, first drying tray and second drying tray are conical hollow sandwich structure, first drying tray sets up directly over the second drying tray, the master batch can fall on the second drying tray along first drying tray, the second drying device is including first hot-blast ring, second hot-blast ring and hot-blast device; the utility model discloses a heat conduction formula and heat convection formula are dried, and its dry heating area is big, and the thermal efficiency is high, and is dry even, effectively reduces the master batch moisture content, has prevented the caking between the master batch.

Description

Master batch drying system

Technical Field

The utility model relates to a fill master batch production machinery, especially relate to a drying system for producing master batch.

Background

In the master batch production process, because the master batch wets easily, the master batch after wetting can take place the caking phenomenon to influence the result of use of master batch, so generally need use drying device to carry out the drying to the master batch, make master batch moisture reduce to below 0.1%, just so make things convenient for the transportation and the saving of master batch, and do not influence subsequent use. However, when the existing drying equipment is used for drying the master batches, the master batches are easy to agglomerate due to uneven drying, the production quality of the master batches is influenced, the master batches are easy to shear when the stirrer is used for stirring the master batches, the master batches are crushed, the product quality is unstable, and the working efficiency is low; meanwhile, the existing drying device has low heat energy utilization rate and high energy consumption, and the master batch is easy to overheat during drying, so that the master batch is deteriorated, and the production efficiency is seriously influenced.

The above background disclosure is only provided as an aid to understanding the concept and technical solutions of the present invention, and it does not necessarily belong to the prior art of the present patent application, and it should not be used to evaluate the novelty and inventive step of the present application in the case that there is no clear evidence that the above contents are disclosed at the filing date of the present patent application.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at overcomes the defect that above-mentioned background art exists, provides a master batch drying system.

In order to achieve the above object, the utility model provides a master batch drying system, include: the master batch drying device comprises a tank body, a blanking hopper, a first drying device and a dust removing device, wherein the blanking hopper is arranged at the top of the tank body, a blanking port at the bottom of the blanking hopper is communicated with a feeding port arranged at the center of the top of the tank body, the first drying device and the dust removing device are respectively communicated with the interior of the tank body and used for drying and removing dust of master batches entering the tank body, the first drying device comprises a first drying disc, a second drying disc and a heat source device, the first drying disc and the second drying disc are arranged in the tank body and are both in a conical hollow sandwich structure, the first drying disc is arranged right above the second drying disc, the second drying disc is arranged in an inverted mode, a leakage port is arranged at the lower part of a cone, the bottom circle radius of the first drying disc is smaller than the top circle radius of the second drying disc, so that the master batches can slide down to the inner circle of the second drying disc along the outer conical surface of the first drying disc, and the heat source device is respectively communicated with the interlayer of the first drying disc and the second drying disc through a heat conducting pipe and is used for transferring heat of the heat source device to the drying disc.

Preferably, the conical top of the first drying tray is aligned with the midpoint of the feeding port, so that the master batch entering the tank body through the feeding port can be guided by the first drying tray to uniformly slide down along the outer conical surface of the first drying tray.

Preferably, a first inlet is formed in a side wall of the lower portion of the first drying tray, a first outlet is formed in a side wall of the upper portion of the first drying tray, a second inlet is formed in a side wall of the lower portion of the second drying tray, a second outlet is formed in a side wall of the upper portion of the second drying tray, a heat medium outlet and a heat medium return port are respectively formed in the heat source device, the first inlet and the second inlet are respectively communicated with the heat medium outlet, and the first outlet and the second outlet are respectively communicated with the heat medium return port; and a first valve is arranged on a pipeline communicated with the first inlet, and a second valve is arranged on a pipeline communicated with the second inlet.

Preferably, the second outlet is communicated with the first inlet through a serial connection pipe, a third valve is arranged on the serial connection pipe, and a fourth valve is arranged on a pipeline through which the heat medium return port is communicated with the second outlet.

Preferably, a medium supplementing port is arranged on the heat medium return port, and a fifth valve is arranged on the medium supplementing port.

Preferably, the drying device further comprises a second drying device, the second drying device comprises a first hot air ring, a second hot air ring and a hot air device, a first drying area and a second drying area are arranged in the tank body, the first drying disc and the second drying disc are arranged in the first drying area, the first hot air ring and the second hot air ring are arranged in the second drying area, the hot air device is respectively communicated with the first hot air ring and the second hot air ring through hot air pipelines, the first hot air ring is arranged at the bottom of the second drying area, and the second hot air ring is arranged in the middle of the second drying area.

Preferably, dust collector is including cyclone, draught fan, dust absorption pipeline and discharge line, dust absorption pipeline one end with cyclone's tangential entry intercommunication, the other end penetrates the internal portion of jar, and be in respectively first drying zone with be equipped with the dust absorption mouth in the second drying zone, discharge line one end with cyclone's export is linked together, the other end with the entry of draught fan is linked together.

Preferably, the hot air device comprises a filter, a blower, a heat exchanger and a heater, wherein an inlet of the filter is communicated with the outside atmosphere, an outlet of the filter is communicated with an inlet of the blower, an outlet of the blower is communicated with the heat exchanger, the heat exchanger is communicated with the heater, an outlet of the induced draft fan is communicated to the heat exchanger through a heat recovery pipe, and the heater is respectively communicated with the first air blowing ring and the second air blowing ring through the hot air pipeline.

Preferably, a sixth valve is arranged on the hot air pipeline communicated with the first blowing ring, and a seventh valve is arranged on the hot air pipeline communicated with the second blowing ring.

Preferably, the bottom of the second drying disc is provided with a separating disc, the middle of the separating disc is provided with a material through hole, the material through hole is communicated with the material leakage hole, and the separating disc is further provided with a plurality of through holes.

The beneficial effects of the utility model include: the master batches entering the tank body are subjected to heat conduction type pre-drying by adopting the first drying device, so that the heating area is large, the heat efficiency is high, stirring is not required in the drying process, no power consumption is caused, the master batches are dried by uniformly sliding while the integrity of the master batches is ensured, the production quality of the master batches is effectively improved, and the energy consumption of equipment is reduced; the first drying disk and the second drying disk can be connected in series or in parallel through the series connection pipe, circulation of the heat-conducting medium can be adjusted according to field production conditions to heat, and the heat utilization rate is further improved; the second drying device is adopted for carrying out heat convection type drying, and dry hot air is blown to the master batches from bottom to top, so that the master batches are in a boiling state, caking among the master batches is effectively prevented, overheating is not easy to occur during drying, the crystallinity of the master batches is improved, and the water content of the master batches is further reduced to be below a target water content; the dust generated during the drying of the first drying device and the second drying device is removed through the dust removing device, so that the product quality is improved; the heat in the damp and hot tail gas generated when the first drying device and the second drying device are dried is recycled through the heat recovery pipe and the heat exchanger, and the energy consumption of the equipment is further reduced.

Drawings

Fig. 1 is an overall schematic diagram of a drying system in an embodiment of the present invention.

Fig. 2 is a schematic sectional view of a part of the tank in the embodiment of the present invention.

Fig. 3 is a schematic view of a first drying device in an embodiment of the present invention.

Fig. 4 is a schematic view of a second drying device and a dust removing device in an embodiment of the present invention.

Reference numerals:

1, a tank body; 101, a feeding port; 102 a discharge hole; 103 a discharge control valve; 2, feeding a hopper; 201, a feed opening; 202 a blanking control valve; 3 a first drying device; 301 a first drying tray; 3011 a first portal; 3012 a first outlet; 3013 a first valve; 302 a second drying pan; 3021 a second inlet; 3022 a second outlet; 3023 a second valve; 3024 a fourth valve; 303 a heat source device; 3031 a thermal medium outlet; 3032 a heat medium reflux port; 3033 a media replenishment port; 3034 a fifth valve; 4, a dust removal device; 401 a cyclone separator; 4011 a discharge outlet; 4012 a discharge control valve; 4013 a tangential inlet; 4014 an exhaust port; 402. An induced draft fan; 403 a dust suction duct; 404 a discharge conduit; 405 a dust suction port; 406 heat recovery tubes; 5 a second drying device; 501 a first hot air ring; 502 second hot air ring; 503 hot air pipes; 504 hot air devices; a 5041 filter; 5042 an air blower; 5043 a heat exchanger; 5044 a heater; 505 a sixth valve; 506 a seventh valve; 6 separating the disc; 601 a plurality of through holes; 602 is communicated with a material opening.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the embodiment of the present invention will solve more clearly understand, the following combines the drawings and embodiment, and goes forward the further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixing function or a circuit connection function.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

As shown in fig. 1 to 4, the present embodiment discloses a master batch drying system, including: the master batch drying device comprises a tank body 1, a discharging hopper 2, a first drying device 3 and a dust removing device 4, wherein the discharging hopper 2 is arranged at the top of the tank body 1, a discharging opening 201 at the bottom of the discharging hopper 2 is communicated with a feeding opening 101 arranged at the center of the top of the tank body 1, a discharging control valve 202 is arranged at the discharging opening 201, the discharging control valve 202 can control the on-off and the entering amount of master batches entering the tank body 1, and the discharging control valve 202 adopts an electromagnetic valve or a pneumatic valve and the like; the first drying device 3 and the dust removing device 4 are respectively communicated with the inside of the tank body 1 and are used for drying and removing dust of master batches entering the tank body 1, the first drying device 3 comprises a first drying disc 301, a second drying disc 302 and a heat source device 303, the first drying disc 301 and the second drying disc 302 are arranged in the tank body 1 and are of a conical hollow sandwich structure, for example, a sandwich layer is arranged on the side wall of a conical funnel, the first drying disc 301 is arranged right above the second drying disc 302, the second drying disc 302 is arranged in an inverted mode, a material leakage hole 304 is formed in the lower portion of the cone, the radius of the bottom circle of the first drying disc 301 is smaller than that of the top circle of the second drying disc 302, so that the master batches can uniformly slide onto the inner conical surface of the second drying disc 302 along the conical surface of the outer circle of the first drying disc 301 to increase the heating area and prolong the heating time, and then flow out through the material leakage hole 304 of the second drying disc 302, and the first drying disc 301 and the second drying disc 302 can be arranged in groups to be arranged up and down alternately; the heat source device 303 is respectively communicated with the interlayers of the first drying disk 301 and the second drying disk 302 through a heat conduction pipeline 305, and is used for transferring heat of the heat source device 303 to the first drying disk 301 and the second drying disk 302 through a heat conduction medium, wherein the heat conduction medium comprises heat conduction oil, hot water, hot air, saturated steam, high-temperature molten salt and the like, the heat source device 303 heats the heat conduction medium and then heats the first drying disk 301 and the second drying disk 302 through the heat conduction medium, and the first drying disk 301 and the second drying disk 302 indirectly heat the master batches passing through the heat conduction medium, so that the moisture of the master batches overflows; carry out heat-conduction formula heating and drying through continuous operation, the heated area is big, is heated evenly, and the thermal efficiency is high, and the drying process need not the stirring, and no power consumption reduces the equipment energy consumption when guaranteeing the master batch integrity.

The vertex of a cone (summit) of first drying disc 301 is aligned (aimed at) with the mid point of pan feeding mouth 101 for get into the internal master batch of jar through pan feeding mouth 101 and can be evenly to landing downwards all around along first drying disc 301's outer circular conical surface by first drying disc 301's the vertex of a cone water conservancy diversion, it is many that an rim charge can not appear, a rim charge causes the jam less, makes the master batch evenly slide and carries out the drying, and dry heating is even, effectively improves master batch stability of quality.

A first inlet 3011 is arranged on the lower side wall of the first drying tray 301, a first outlet 3012 is arranged on the upper side wall of the first drying tray 301, a second inlet 3021 is arranged on the lower side wall of the second drying tray 302, a second outlet 3022 is arranged on the upper side wall of the second drying tray 302, a heat medium outlet 3031 and a heat medium return port 3032 are arranged on the heat source device 303, the first inlet 3011 and the second inlet 3021 are respectively communicated with the heat medium outlet 3031, the first outlet 3012 and the second outlet 3022 are respectively communicated with the heat medium return port 3032, and the heat medium enters and exits from the drying tray so that the drying tray can be heated quickly and uniformly; a first valve 3013 is arranged on a pipeline where the heat medium outlet 3031 is communicated with the first inlet 3011, a second valve 3023 is arranged on a pipeline where the heat medium outlet 3031 is communicated with the second inlet 3021, the first valve 3013 and the second valve 3023 are regulating valves, which can regulate the flow rate of the heat medium to control the temperature of the first drying tray 301 and the second drying tray 302 respectively, and temperature sensors can be arranged on the first drying tray 301 and the second drying tray 302 to detect the temperature of the heating plates to perform feedback regulation on the opening degrees of the first valve 3013 and the second valve 3023, for example, PID regulation control.

The second outlet port 3022 and the first inlet port 3011 are communicated through a series connection pipe 306, a third valve 3061 is arranged on the series connection pipe 306, a fourth valve 3024 is arranged on a pipeline through which the hot medium return port 3032 is communicated with the second outlet port 3022, and the third valve 306 and the fourth valve 3024 are stop valves; through the serial connection pipe 306, the fourth valve 3024 is closed, the third valve 3061 is opened, the first drying tray 301 and the second drying tray 302 are connected in series, so as to correspond to different temperature control requirements on site, for example, when the temperature requirement of the first drying tray 301 is lower than that of the second drying tray 302, the serial connection mode can be adopted, the heat utilization rate of the heat medium is improved, when the temperature of the first drying tray 301 is required to be the same, the connection mode can be switched to be parallel connection, and the connection mode is flexible.

The heat medium return port 3032 is provided with a medium supplement port 3033, the medium supplement port 3033 is provided with a fifth valve 3034, and when the heat medium is insufficient, the fifth valve 3034 is opened, so that the heat medium can be supplemented through the medium supplement port 3033, and the heat medium is ensured to be sufficient, so that the heating efficiency is not influenced.

The drying device comprises a tank body 1, a first drying area 104 and a second drying area 105 are arranged in the tank body 1, a discharge hole 102 is formed in the bottom of the tank body 1, a discharge control valve 103 is arranged at the discharge hole 102, dried master batches are discharged from the discharge hole 102, a cooling device can be arranged at the discharge hole 102, and the dried master batches are immediately cooled after being discharged from the discharge hole 102 and then packaged for storage; the first drying disc 301 and the second drying disc 302 are arranged in the first drying area 104, the first hot air ring 501 and the second hot air ring 502 are arranged in the second drying area 105, the hot air device 504 is respectively communicated with the first hot air ring 501 and the second hot air ring 502 through a hot air pipeline 503, the first hot air ring 501 is arranged at the bottom of the second drying area 105, the second hot air ring 502 is arranged in the middle of the second drying area 105, the pre-drying is carried out through the first drying disc 301 and the second drying disc 302 in the first drying area 104, then the pre-drying is carried out in the second drying area 105, and the dry hot air is blown to the master batches from bottom to top through the first hot air ring 501 and the second hot air ring 502, so that the master batches are boiled from bottom to top, the agglomeration among the master batches is effectively prevented, the moisture content of the master batches is not easy to overheat during drying, the crystallinity of the master batches is improved, and the moisture content of the master batches is further reduced to be below a target; the first hot air ring 501, the second hot air ring 502 and the hot air pipeline 503 are preferably connected in a horizontal orthogonal manner, the hot air port on the first hot air ring 501 is vertically upward and the hot air port on the second hot air ring 502 is horizontally inward, so that the master batches form a turbulent operation mode, and the internal hot air is more fully contacted with the master batches.

The dust removing device 4 comprises a cyclone separator 401, an induced draft fan 402, a dust suction pipeline 403 and a discharge pipeline 404, one end of the dust suction pipeline 403 is communicated with a tangential inlet 4013 of the cyclone separator 401, the other end of the dust suction pipeline penetrates into the tank body 1, dust suction ports 405 are respectively arranged in the first drying area 104 and the second drying area 105, and the dust suction ports 405 are preferably respectively arranged above the first drying disc 301, above the second drying disc 302 and above the separating disc 6; discharge tube 404 one end is linked together with cyclone 401's discharge port 4014, and the other end is linked together with draught fan 402 entry, and cyclone 401 bottom is equipped with bin outlet 4011, is equipped with row material control valve 4012 on the bin outlet 4011, gets rid of the dust that the drying process produced through bin outlet 4011, improves the quality of master batch product.

The hot air device 504 comprises a filter 5041, a blower 5042, a heat exchanger 5043 and a heater 5044, wherein an inlet of the filter 5041 is communicated with outside air, the filter 5041 can dehumidify and filter the air entering from the outside air to form dry air, an outlet of the filter 5041 is communicated with an inlet of the blower 5042, an outlet of the blower 5042 is communicated with the heat exchanger 5043, the heat exchanger 5043 is communicated with the heater 5044, an outlet of the induced draft fan 402 is communicated with the heat exchanger 5043 through a heat recovery pipe 406, the heater 5044 is respectively communicated with the first hot air ring 501 and the second hot air ring 502 through a hot air pipeline 503, the dry air is blown into the heat exchanger 5043 through the blower 5042 to exchange heat for preheating, then is heated through the heater 5044 to form dry hot air, the hot air is introduced into the tank body 1 to carry out heat convection with the master batches in the tank body 1 to heat, heat in wet and hot tail gas is recycled through the heat recovery pipe 406, and energy consumption of equipment is further reduced.

A sixth valve 505 is arranged on the hot air pipe 503 communicated with the first hot air ring 501, a seventh valve 506 is arranged on the hot air pipe 503 communicated with the second hot air ring 502, and the sixth valve 505 and the seventh valve 506 adopt regulating valves, so that the flow of hot air entering the tank body 1 can be regulated.

The bottom of the second drying disc 302 is provided with a separating disc 6, the middle of the separating disc 6 is provided with a material through port 602, the material through port 602 is communicated with the material leaking port 304, so that the material separating disc 6 in the material leaking port 304 is provided with a plurality of through holes 601, dust generated by blowing dried master batches through the first hot air ring 501 and the second hot air ring 502 enters the upper part of the separating disc 6 through the through holes 601, the master batches are blocked below for separation, and then the dust is sucked to the cyclone separator 401 through the dust suction port 405 on the dust suction pipeline 403 for separation, so that the dust and the master batches are prevented from being mixed together.

The utility model discloses a theory of operation and use flow: the master batches enter the tank body 1 from the lower hopper 2 and fall to the top of a first drying disc 301 arranged in the first drying area 104, are guided by the top of the first drying disc 301 to uniformly diffuse and slide along the first drying disc 301 all around, fall onto the inner side wall of a second drying disc 302, then slide down along the side wall to the center and fall into the second drying area 105, before the master batches enter the first drying area 104, a heat source device 303 heats the first drying disc 301 and the second drying disc 302 through a heat-conducting medium, and when the master batches pass through the first drying disc 301 and the second drying disc 302, the master batches are indirectly heated for heat-conduction drying; after the master batches enter the second drying area 105, a hot air device 504 in the second drying area 105 heats the dried air, and the air is respectively guided into a first hot air ring 501 and a second hot air ring 502 through a hot air pipeline 503 to be blown out to carry out heat convection type drying with the master batches; the hot and humid air and dust generated during drying are sucked by the cyclone 401 through the dust suction pipe 403 for treatment, and the tail gas with a certain temperature is introduced into the heat exchanger 5043 through the heat recovery pipe 406 to exchange heat with the dry cold air and then is discharged to the outside atmosphere.

The background section of the present invention may contain background information related to the problems or the environment of the present invention and is not necessarily descriptive of the prior art. Accordingly, the inclusion in the background section is not an admission of prior art by the applicant.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific/preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. For those skilled in the art to which the invention pertains, a plurality of alternatives or modifications can be made to the described embodiments without departing from the concept of the invention, and these alternatives or modifications should be considered as belonging to the protection scope of the invention. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Those skilled in the art will be able to combine and combine features of different embodiments or examples and features of different embodiments or examples described in this specification without contradiction. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the claims.

Claims (10)

1. A master batch drying system, comprising: the master batch drying device comprises a tank body, a blanking hopper, a first drying device and a dust removing device, wherein the blanking hopper is arranged at the top of the tank body, a blanking port at the bottom of the blanking hopper is communicated with a feeding port arranged at the center of the top of the tank body, the first drying device and the dust removing device are respectively communicated with the interior of the tank body and used for drying and removing dust of master batches entering the tank body, the first drying device comprises a first drying disc, a second drying disc and a heat source device, the first drying disc and the second drying disc are arranged in the tank body and are both in a conical hollow sandwich structure, the first drying disc is arranged right above the second drying disc, the second drying disc is arranged in an inverted mode, a leakage port is arranged at the lower part of a cone, the bottom circle radius of the first drying disc is smaller than the top circle radius of the second drying disc, so that the master batches can slide down to the inner circle of the second drying disc along the outer conical surface of the first drying disc, and the heat source device is respectively communicated with the interlayer of the first drying disc and the second drying disc through a heat conducting pipe and is used for transferring heat of the heat source device to the drying disc.

2. The drying system of claim 1, wherein: the conical top of the first drying disc is aligned with the middle point of the feeding port, so that the master batch entering the tank body through the feeding port can be guided by the first drying disc to uniformly slide downwards along the outer conical surface of the first drying disc.

3. The drying system of claim 2, wherein: the side wall of the lower part of the first drying tray is provided with a first inlet, the side wall of the upper part of the first drying tray is provided with a first outlet, the side wall of the lower part of the second drying tray is provided with a second inlet, the side wall of the upper part of the second drying tray is provided with a second outlet, the heat source device is respectively provided with a heat medium outlet and a heat medium return port, the first inlet and the second inlet are respectively communicated with the heat medium outlet, and the first outlet and the second outlet are respectively communicated with the heat medium return port; and a first valve is arranged on a pipeline communicated with the first inlet of the heat medium outlet, and a second valve is arranged on a pipeline communicated with the second inlet of the heat medium outlet.

4. The drying system of claim 3, wherein: the second outlet is communicated with the first inlet through a serial connection pipe, a third valve is arranged on the serial connection pipe, and a fourth valve is arranged on a pipeline through which the heat medium return port is communicated with the second outlet.

5. The drying system of claim 4, wherein: the heat medium return port is provided with a medium supplement port, and the medium supplement port is provided with a fifth valve.

6. The drying system of claim 5, wherein: still include the second drying device, the second drying device is including first hot-blast ring, second hot-blast ring and hot-blast apparatus, internal portion of jar is equipped with first drying area and second drying area, first drying tray with the setting of second drying tray is in the first drying area, first hot-blast ring with the setting of second hot-blast ring is in the second drying area, hot-blast apparatus pass through hot-blast pipeline respectively with first hot-blast ring with the hot-blast ring of second is linked together, first hot-blast ring sets up second drying area bottom, the setting of second hot-blast ring is in second drying area middle part.

7. The drying system of claim 6, wherein: dust collector is including cyclone, draught fan, dust absorption pipeline and discharge line, dust absorption pipeline one end with cyclone's tangential entry intercommunication, the other end penetrates jar internal portion, and be in respectively first drying zone with be equipped with in the second drying zone and seted up the dust absorption mouth, discharge line one end with cyclone's export is linked together, the other end with the entry of draught fan is linked together.

8. The drying system of claim 7, wherein: the hot air device comprises a filter, an air blower, a heat exchanger and a heater, wherein an inlet of the filter is communicated with the outside atmosphere, an outlet of the filter is communicated with an inlet of the air blower, an outlet of the air blower is communicated with the heat exchanger, the heat exchanger is communicated with the heater, an outlet of the induced draft fan is communicated to the heat exchanger through a heat recovery pipe, and the heater is respectively communicated with the first air blowing ring and the second air blowing ring through the hot air pipeline.

9. The drying system of claim 8, wherein: a sixth valve is arranged on the hot air pipeline communicated with the first air blowing ring, and a seventh valve is arranged on the hot air pipeline communicated with the second air blowing ring.

10. The drying system of claim 9, wherein: the bottom of the second drying disc is provided with a separating disc, the middle of the separating disc is provided with a material through hole, the material through hole is communicated with the material leakage hole, and the separating disc is further provided with a plurality of through holes.

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