CN215702782U

CN215702782U - Intermittent asphalt concrete mixing plant

Info

Publication number: CN215702782U
Application number: CN202122068555.8U
Authority: CN
Inventors: 张裕豪
Original assignee: Ziyang Guangwei Intelligent Equipment Co ltd
Current assignee: Ziyang Guangwei Intelligent Equipment Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-01
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses an intermittent asphalt concrete mixing plant which comprises an aggregate feeding device, a powder feeding device, an asphalt feeding device, a drying device, a first transfer device, a screening device, a premixing device, a second transfer device and a mixing and stirring device, wherein the aggregate feeding device, the drying device, the first transfer device and the screening device are sequentially connected, the discharge end of the screening device and the discharge end of the powder feeding device are both connected with the feed end of the premixing device, the premixing device is used for pre-mixing hot aggregate and normal-temperature powder to achieve thermal balance, and the discharge end of the premixing device is connected with the mixing and stirring device through the second transfer device. The hot aggregate and the normal-temperature powder are accurately measured and then premixed by the premixing device to reach thermal balance, and then are put into the stirring and mixing device together with the asphalt to obtain the asphalt concrete, so that the temperature of the hot aggregate can be effectively reduced, and the problem of asphalt green smoke generated after the local high temperature of the hot aggregate is mixed with the asphalt is solved.

Description

Intermittent asphalt concrete mixing plant

Technical Field

The utility model relates to the technical field of construction equipment, in particular to an intermittent asphalt concrete mixing plant.

Background

The concrete is called concrete (t xi ng) for short, which is a general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term "asphalt concrete" generally refers to asphalt as a cementing material and sand and stone as aggregate; mixing with water (optionally containing additive and admixture) in a certain proportion, and stirring to obtain the asphalt concrete. Because the concrete has the characteristics of rich raw materials, low price and simple production process, the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and the characteristics ensure that the application range of the concrete is very wide.

The existing asphalt concrete has a plurality of problems in the production process, such as:

(1) because the aggregate drying cylinder is provided with the air draft device, mineral powder cannot enter the drying cylinder for heating, the drying temperature of other raw materials is usually higher than the temperature of a finished product material by 15-20 ℃, so that the mineral powder with lower temperature is heated during stirring, the time for the raw materials to enter the stirrer is random, and the raw materials enter in a non-uniform manner, so that the temperature of local aggregate is too high and is close to the asphalt carbonization temperature, and asphalt green smoke is easily generated when the raw materials are mixed with asphalt, thereby causing environmental pollution and simultaneously influencing the production quality of asphalt concrete.

(2) The whole construction height of the mixing plant is higher, and the construction and maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an intermittent asphalt concrete mixing plant, which solves the problems that in the prior art, the local hot aggregate is too high in temperature, so that asphalt green smoke is easily generated when the local hot aggregate is mixed with asphalt, the environment pollution is caused, and the production quality of the asphalt concrete is influenced.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides an intermittent type formula asphalt concrete mixing plant, includes aggregate feedway, powder feedway, pitch feedway, drying device, first transfer device, screening plant, pre-mixing arrangement, second transfer device and stirring mixing arrangement, aggregate feedway, drying device, first transfer device and screening plant connect gradually, screening plant's discharge end and powder feedway's discharge end all with pre-mixing arrangement's feed end is connected, pre-mixing arrangement be used for with the hot aggregate of screening plant discharge end and the normal atmospheric temperature powder of powder feedway discharge end stir in advance and mix and make it reach thermal balance, pre-mixing arrangement's discharge end passes through second transfer device is connected with stirring mixing arrangement, pitch feedway with stirring mixing arrangement connects.

As an alternative scheme of the utility model, the screening device comprises a vibrating screen, a plurality of thermal aggregate buffering bins are arranged at the discharge end of the vibrating screen, thermal aggregate reduction weighing hoppers are arranged in the thermal aggregate buffering bins, and each thermal aggregate reduction weighing hopper is connected with the feed end of the premixing device.

As an alternative of the utility model, the hot aggregate buffer storage bin is provided with a water cooling circulation device.

As an alternative scheme of the utility model, the plurality of thermal aggregate caching bins comprise a sand caching bin and a plurality of stone caching bins, the plurality of thermal aggregate decrement measuring hoppers comprise a sand decrement measuring hopper and a stone decrement measuring hopper, the sand decrement measuring hopper is arranged at the bottom of the sand caching bin, the stone decrement measuring hopper is arranged at the bottom of the stone caching bin, and the sand decrement measuring hopper and the stone decrement measuring hopper are connected with the feeding end of the premixing device through a first conveying device.

As an alternative scheme of the utility model, the powder feeding device comprises a powder storage bin and a fine sand storage bin, the bottoms of the powder storage bin and the fine sand storage bin are respectively provided with a powder decrement metering hopper and a fine sand decrement metering hopper, and the powder decrement metering hopper and the fine sand decrement metering hopper are connected with the feeding end of the premixing device through a second conveying device.

As an alternative of the utility model, the first transfer device and the second transfer device are both hoists.

As an alternative of the utility model, the aggregate feeding device comprises a plurality of cold aggregate storage bins, the cold aggregate storage bins are provided with cold aggregate decrement weighing hoppers, and each cold aggregate decrement weighing hopper is connected with the feeding end of the drying device through a third conveying device.

As an alternative of the utility model, the plurality of cold aggregate storage bins comprise a sand storage bin and a plurality of stone storage bins, the plurality of cold aggregate decrement weighing hoppers comprise a sand weighing hopper and a stone weighing hopper, the sand weighing hopper is arranged at the bottom of the sand storage bin, the stone weighing hopper is arranged at the bottom of the stone storage bin, and the sand weighing hopper and the stone weighing hopper are connected with the feeding end of the drying device through the third conveying device.

As an alternative of the utility model, the stirring and mixing device comprises a mixer body, the mixer body is connected with a middle storage hopper and a finished product bin, and the middle storage hopper is connected with the second transfer device.

As an alternative of the utility model, the asphalt feeding device comprises an asphalt measuring hopper, the asphalt measuring hopper is connected with a mixer body, and the mixer body is connected with a water measuring hopper and an additive measuring hopper.

The utility model has the beneficial effects that:

1. the utility model provides an intermittent asphalt concrete mixing plant, which is characterized in that an aggregate feeding device, a drying device, a first transfer device and a screening device are sequentially connected, the discharge end of the screening device and the discharge end of a powder feeding device are both connected with the feed end of a premixing device, the drying device heats aggregates to obtain hot aggregates, the hot aggregates are pre-stirred and mixed with normal-temperature powder through the premixing device after being screened and measured to reach thermal balance, and then the hot aggregates are mixed with asphalt to obtain asphalt concrete. In the process of uniformly mixing the hot aggregate and the normal-temperature powder by the premixing device, the hot aggregate heats the normal-temperature powder through heat transfer, the temperature of the hot aggregate can be effectively reduced, the hot aggregate and the normal-temperature powder are thermally balanced, the energy consumption is saved, the problem that the local hot aggregate is too high in temperature and close to the asphalt carbonization temperature, and the asphalt is easily subjected to asphalt smoke generation when being mixed with asphalt, so that the environmental pollution is caused, and the production quality of asphalt concrete is also influenced.

2. According to the utility model, the cold aggregate reduction metering hopper, the hot aggregate reduction metering hopper, the powder reduction metering hopper and the fine sand reduction metering hopper are arranged, the required aggregates and powder are metered before stirring, the cold aggregates continuously discharged from the cold aggregate storage bin are heated and transferred to the hot aggregate storage bin, and the hot aggregates in the hot aggregate storage bin and the powder of the powder feeding device required by the asphalt concrete for one stirring period are fed into the premixing device for uniformly mixing every time, so that the accuracy of supplying the aggregates and the powder can be greatly improved, and the stirred asphalt concrete can meet the design requirement. According to the utility model, the hot aggregate and the normal-temperature powder are accurately measured and then premixed through the premixing device to reach thermal balance, and then are put into the stirring and mixing device together with the asphalt to be stirred to obtain the asphalt concrete, so that the temperature of the hot aggregate can be effectively reduced, and the problem of asphalt green smoke generated after the local hot aggregate is mixed with the asphalt at high temperature is avoided.

3. The hot aggregate caching bin is provided with the water-cooling circulating device in a matching mode, and the circulating pipeline of the water-cooling circulating device is arranged around the hot aggregate caching bin, so that the cooling treatment of the hot aggregate is realized. According to the utility model, a hot waste bin of a traditional mixing plant can be saved, the water-cooling circulation device can be added to cool the hot aggregate waste for recycling, the hot aggregate waste can be used as an aggregate source of cement concrete after being cooled by screening water, and the waste of resources and the environmental pollution are avoided.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bone material supplying device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a powder feeder according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the construction of a screening device in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural view of an agitating and mixing apparatus according to an embodiment of the present invention.

In the figure: 1-an aggregate feeding device; 11-a third conveyor; 12-a sand storage bin; 13-a stone storage bin; 14-a sand hopper; 15-a stone measuring hopper; 2-powder feeding device; 21-powder storage bin; 22-fine sand storage; 23-powder decrement weighing hopper; 24-a fine sand reduction weighing hopper; 25-a second conveyor; 3-an asphalt feeding device; 31-an asphalt weighing hopper; 32-a water measuring hopper; 33-an additive weighing hopper; 4-drying device; 5-a first transfer device; 6-screening device; 61-a vibrating screen; 62-water cooling circulation device; 63-a sand buffer bin; 64-a stone cache bin; 65-sand reduction measuring hopper; 66-a stone decrement measuring hopper; 67-a first conveyor; 7-a premixing device; 8-a second transfer device; 9-stirring and mixing device; 91-mixing body; 92-middle storage hopper; 93-finished product warehouse.

Detailed Description

Examples

As shown in fig. 1-5, the present embodiment provides an intermittent asphalt mixing plant, including but not limited to an aggregate feeding device 1, a powder feeding device 2, an asphalt feeding device 3, a drying device 4, a first transfer device 5, a screening device 6, a premixing device 7, a second transfer device 8, and a mixing and stirring device 9, where the aggregate feeding device 1 is used for providing aggregates for producing asphalt concrete for the mixing plant, the powder feeding device 2 is used for providing powders for producing asphalt concrete for the mixing plant, and the asphalt feeding device 3 is used for providing asphalt for the mixing plant.

Aggregate feedway 1, drying device 4, first transfer device 5 and screening plant 6 connect gradually, and the aggregate of aggregate feedway 1 carries out drying process through drying device 4, then transports screening plant 6 by first transfer device 5 and carries out screening process, obtains the aggregate of different footprints. As the aggregate adopted by the asphalt concrete may have a plurality of materials with different grain sizes, the materials with different grain sizes are selected for proportioning according to actual requirements after screening. The aggregate feeding device 1 can adopt a mixture or can adopt a plurality of materials with different grain sizes for proportioning. The utility model dries the cold aggregate through the drying device 4, can avoid the asphalt concrete from generating mixed smoke of asphalt green smoke and water vapor caused by the water content of the aggregate, and reduces the environmental pollution in the asphalt production process.

The discharge end of the screening device 6 and the discharge end of the powder feeding device 2 are connected with the feed end of the premixing device 7, the premixing device 7 is used for pre-stirring and mixing the hot aggregate at the discharge end of the screening device 6 and the normal-temperature powder at the discharge end of the powder feeding device 2 to enable the hot aggregate and the normal-temperature powder to reach thermal balance, the discharge end of the premixing device 7 is connected with the stirring and mixing device 9 through the second transfer device 8, and the asphalt feeding device 3 is connected with the stirring and mixing device 9. Aggregate screened by the screening device 6 and powder enter the premixing device 7 together for premixing treatment, and then are transferred to the stirring and mixing device 9 through the second transfer device 8 to be mixed with asphalt. The drying device 4 heats the aggregate to obtain hot aggregate, the hot aggregate is screened and measured, then is premixed and mixed with the normal-temperature powder through the premixing device 7 to reach thermal balance, and then is mixed with the asphalt to obtain the asphalt concrete. The premixing device 7 heats the normal-temperature powder through heat transfer in the process of uniformly mixing the hot aggregate and the normal-temperature powder, the temperature of the hot aggregate can be effectively reduced, the hot aggregate and the normal-temperature powder are thermally balanced, energy consumption is saved, and the problems that the local hot aggregate is too high in temperature and is close to the asphalt carbonization temperature, so that asphalt green smoke is easily generated when the hot aggregate and asphalt are mixed, the environment pollution is caused, and the production quality of asphalt concrete is influenced are effectively solved. In addition, as the aggregate and the powder are uniformly pre-stirred for one time through the pre-mixing device 7, the mixing uniformity of the aggregate and the powder is improved, the aggregate and the powder can be effectively prevented from being seriously separated in subsequent treatment, the workability of the asphalt concrete is enhanced, the stirring time of the stirring and mixing device 9 for the aggregate and the powder is shortened, and the working efficiency of the stirring station is improved.

As shown in fig. 4, specifically, the screening device 6 includes a vibrating screen 61, a discharge end of the vibrating screen 61 is provided with a plurality of thermal aggregate buffer bins, the thermal aggregate buffer bins are provided with thermal aggregate reduction weighing hoppers, and each thermal aggregate reduction weighing hopper is connected to a feed end of the premixing device 7. The vibrating screen 61 subdivides the hot aggregate into a plurality of gradations, so that the proportion of the aggregate is finer, and the quality of the asphalt concrete is further ensured. Every hot aggregate buffer storage storehouse all is equipped with hot aggregate decrement weighing hopper, through subtraction measurement control discharge, very big improvement unloading precision and row material are even.

In this embodiment, the hot aggregate buffer storage bin is provided with a water-cooling circulation device 62, and a circulation pipeline of the water-cooling circulation device 62 is arranged around the hot aggregate buffer storage bin, so as to realize the cooling treatment of the hot aggregate. The water-cooling circulation device 62 is added to cool the hot aggregate waste, and then the hot aggregate waste can be reused, and the hot aggregate waste can be used as an aggregate source of cement concrete after being cooled by water, so that resource waste and environmental pollution are avoided.

Further, a plurality of hot aggregate buffering storehouses include sand buffering storehouse 63 and a plurality of stone buffering storehouse 64, and the quantity of sand buffering storehouse 63 and stone buffering storehouse 64 sets up according to actual need, and in this embodiment, sand buffering storehouse 63 has one, and stone buffering storehouse 64 has four, and four stone buffering storehouses 64 have the stone of different footprints. The thermal aggregate decrement measuring hoppers comprise a sand decrement measuring hopper 65 and a stone decrement measuring hopper 66, the sand decrement measuring hopper 65 is arranged at the bottom of the sand cache bin 63, the stone decrement measuring hopper 66 is arranged at the bottom of the stone cache bin 64, and the sand decrement measuring hopper 65 and the stone decrement measuring hopper 66 are connected with the feeding end of the premixing device 7 through a first conveying device 67. The first conveying device 67 adopts a screw conveyor (fine material) and a self-falling material (coarse aggregate), the screw conveyor is arranged at the bottom of the sand reduction measuring hopper 65 and the stone reduction measuring hopper 66, and after the sand buffer bins 63 and the stone buffer bins 64 are well proportioned, the sand and the stones are conveyed to the premixing device 7 through the screw conveyor and then are uniformly mixed with the powder.

As shown in fig. 2, the aggregate feeding device 1 includes a plurality of cold aggregate storage bins, the cold aggregate storage bins are provided with cold aggregate decrement weighing hoppers, and each cold aggregate decrement weighing hopper is connected with the feeding end of the drying device 4 through a third conveying device 11. The third conveying device 11 adopts a belt conveyor, a plurality of cold aggregate storage bins store aggregates with different grain sizes, and a proper amount of aggregates are selected and conveyed to the drying device 4 through the belt conveyor according to the required proportion of the asphalt concrete.

Specifically, a plurality of cold aggregate storage storehouse include that the storehouse 12 is stored to the grit and a plurality of stone is stored the storehouse 13, and the grit is stored the storehouse 12 and the quantity that the storehouse 13 was stored to the stone and is set up according to actual demand, and in this embodiment, the storehouse 12 is stored to the grit has one, and the storehouse 13 is stored to the stone has four, and four stones store the storehouse 13 and have the stone of different footprints. The cold aggregate decrement weighing hoppers comprise a sand weighing hopper 14 and a stone weighing hopper 15, the sand weighing hopper 14 is arranged at the bottom of the sand storage bin 12, the stone weighing hopper 15 is arranged at the bottom of the stone storage bin 13, and the sand weighing hopper 14 and the stone weighing hopper 15 are connected with the feeding end of the drying device 4 through the third conveying device 11. The sand measuring hopper 14 and the stone measuring hopper 15 adopt a decrement measuring mode to feed, so that the proportioning precision is improved, and the quality of the asphalt concrete is better.

As shown in fig. 2, in the present embodiment, the powder supply device 2 includes a powder storage bin 21 and a fine sand storage bin 22, a powder amount reducing hopper 23 and a fine sand amount reducing hopper 24 are respectively disposed at the bottoms of the powder storage bin 21 and the fine sand storage bin 22, and the powder amount reducing hopper 23 and the fine sand amount reducing hopper 24 are connected to the feed end of the premixing device 7 through a second conveying device 25. The second conveying device 25 adopts a conveying screw machine, the powder storage bin 21 and the fine sand storage bin 22 respectively store fine powder and fine sand, the powder decrement measuring hopper 23 and the fine sand decrement measuring hopper 24 adopt subtraction measurement to control the proportion of the fine powder and the fine sand, and the fine powder and the fine sand are conveyed to the premixing device 7 through the conveying screw machine to be premixed with aggregate.

The whole construction height of the existing asphalt concrete mixing plant is higher, and the construction and maintenance cost is increased. In this embodiment, the first transfer device 5 and the second transfer device 8 are both hoists. According to the utility model, the aggregate is lifted by one lifting machine, and the aggregate and powder are conveyed to the stirring and mixing device 9 by the other lifting machine, the overall height of the stirring station is about 15 meters, the overall height of the stirring station is greatly reduced, and the equipment investment and the environment-friendly investment cost are reduced.

As shown in fig. 5, in this embodiment, the stirring and mixing device 9 includes a mixer body 91, the mixer body 91 is connected with a middle storage hopper 92 and a finished product bin 93, and the middle storage hopper 92 is connected with the second transfer device 8. Well hopper 92 sets up in the top of mixer body 91, and well hopper 92 is used for keeping in the powder and the aggregate of mixing, and finished product storehouse 93 sets up in the below of mixer body 91, and finished product storehouse 93 keeps in the asphalt concrete that the mixture was accomplished.

The asphalt feeding device 3 comprises an asphalt metering hopper 31, the asphalt metering hopper 31 is connected with a mixer body 91, the mixer body 91 is connected with a water metering hopper 32 and an additive metering hopper 33, the water metering hopper 32 is used for processing and cooling the cooled aggregate, and the mixing station is switched to an intermittent cement concrete working mode at the moment.

According to the utility model, the hot aggregate reduction weighing hopper, the powder reduction weighing hopper 23 and the fine sand reduction weighing hopper 24 are arranged, so that the required hot aggregate and powder are weighed before each stirring, the hot aggregate and powder for one batching period are uniformly fed into the premixing device 7 for uniformly mixing at one time, the accuracy of aggregate and powder supply can be greatly improved, and the stirred asphalt concrete can meet the design requirement. According to the utility model, the hot aggregate and the normal-temperature powder are accurately measured and then premixed by the premixing device 7, and are put into the stirring and mixing device 9 together with the asphalt after reaching the thermal balance to be stirred to obtain the asphalt concrete, so that the temperature of the hot aggregate can be effectively reduced, and the problem of asphalt green smoke generated after the local hot aggregate is mixed with the asphalt due to high temperature is avoided.

In a specific implementation process, a flash outlet is arranged at the position of a feed inlet of each hot aggregate buffer bin in the embodiment, and each flash outlet is connected with a receiving container, so that the phenomenon that hot aggregates overflow from the hot aggregate buffer bins to cause raw material waste can be avoided.

The working process of the mixing station provided by the embodiment of the utility model comprises the following steps:

during stirring, obtaining corresponding sand and stones from the sand storage bin 12 and the stone storage bin 13 according to a ratio, conveying the sand and the stones to the drying device 4 for heating and drying, lifting the heated and dried sand and stones to the vibrating screen 61 through the lifting machine, screening the sand and the stones by the vibrating screen 61, and then respectively storing the screened sand and stones in the sand buffer bin 63 and the stone buffer bin 64, wherein the sand and the stones have certain temperatures; according to actual proportioning requirements, corresponding sand, stones, fine powder and fine sand are obtained from the sand buffering bin 63, the stone buffering bin 64, the powder storage bin 21 and the fine sand storage bin 22 respectively, then the sand, the stones, the fine powder and the fine sand are conveyed to the premixing device 7 for premixing, in the premixing process, heat of the sand and the stones is transferred to the fine powder and the fine sand, the stones, the fine powder and the fine sand reach thermal balance, and the mixing uniformity of the aggregate and the powder is improved after the sand, the stones, the fine powder and the fine sand are premixed, so that the aggregate and the powder can be effectively prevented from being seriously separated in subsequent treatment, the workability of asphalt concrete is enhanced, the stirring time of a stirring and mixing device for the aggregate and the powder is shortened, and the working efficiency of a stirring station is improved; after the premixing is finished, conveying the sand, the pebbles, the fine powder and the fine sand to a middle storage hopper 92 through a hoisting machine, and adding the materials in the middle storage hopper 92 into the mixing machine body 91; then, a proper amount of asphalt and an additive (if the additive is needed, a proper amount of the additive is added according to the mixture ratio) are added into the mixer body 91 according to the mixture ratio, stirring and mixing are carried out, a finished product asphalt concrete is obtained after stirring and mixing are finished, and the finished product asphalt concrete is temporarily stored in a finished product bin 93.

During the process of stirring the finished product asphalt concrete, premixing the sand, the pebbles, the fine powder and the fine sand in the next stirring period, then conveying the mixture to the middle storage hopper 92 for temporary storage, after the finished product asphalt concrete in the period is stirred and conveyed to the finished product bin 93, adding the materials in the middle storage hopper 54 into the mixer body 92, and simultaneously adding asphalt and an additive (if necessary, the additive can be added) for stirring and mixing; then, sand, stones, fine powder and fine sand in the next period are premixed and conveyed to the middle storage hopper 92 for temporary storage, and the operation is repeated in this way, so that the working efficiency is improved.

The utility model designs the sand decrement measuring hopper 65, the stone decrement measuring hopper 66, the powder decrement measuring hopper 23 and the fine sand decrement measuring hopper 24, before each stirring, sand, stone, fine powder and fine sand in a batching period are metered, and the quantitative supply of the sand, the stone, the fine powder and the fine sand is realized through the sand decrement measuring hopper 65, the stone decrement measuring hopper 66, the powder decrement measuring hopper 23 and the fine sand decrement measuring hopper 24, so that the accuracy of the supply of the sand, the stone, the fine powder and the fine sand can be greatly improved, the stirred asphalt concrete can meet the design requirement, and meanwhile, certain raw material cost can be saved.

In the description of the present invention, the terms "mounted," "connected," "fixed," and the like are to be understood broadly and may be fixedly connected, detachably connected, or integrated; may be a mechanical or electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. Those skilled in the art will understand the specific meaning of the above terms in the present invention. Furthermore, the particular features, structures, etc. described in the examples can be included in at least one implementation and can be combined by one skilled in the art without conflicting therewith. The protection scope of the present invention is not limited to the above specific examples, and embodiments that can be imagined by those skilled in the art without creative efforts based on the basic technical concept of the present invention belong to the protection scope of the present invention. Particularly, under the influence of the concept of premixing normal-temperature powder and hot aggregate and then adding asphalt for stirring, the scheme that the hot aggregate and the normal-temperature powder which are metered in the traditional station are mixed to reach thermal balance and then are put into the asphalt for stirring also belongs to the protection scope of the utility model.

Claims

1. The utility model provides an intermittent type formula asphalt concrete mixing plant, its characterized in that, including aggregate feedway (1), powder feedway (2), pitch feedway (3), drying device (4), first transfer device (5), screening plant (6), premixing device (7), second transfer device (8) and stirring mixing arrangement (9), aggregate feedway (1), drying device (4), first transfer device (5) and screening plant (6) connect gradually, the discharge end of screening plant (6) and the discharge end of powder feedway (2) all with the feed end of premixing device (7) is connected, premixing device (7) be used for with the hot aggregate of screening plant (6) discharge end and the normal atmospheric temperature powder of powder feedway (2) discharge end stir in advance and mix and make it reach thermal balance, the discharge end of premixing device (7) passes through second transfer device (8) and stirring mixing arrangement (9) ) And the asphalt feeding device (3) is connected with the stirring and mixing device (9).

2. A batch-type asphalt mixing plant according to claim 1, wherein the screening device (6) comprises a vibrating screen (61), a plurality of hot aggregate buffer bins are arranged at the discharge end of the vibrating screen (61), hot aggregate reduction weighing hoppers are arranged below the hot aggregate buffer bins, and each hot aggregate reduction weighing hopper is connected with the feed end of the premixing device (7).

3. A batch asphalt mixing plant according to claim 2, characterized in that said hot aggregate buffer bin is provided with a water-cooled circulation device (62).

4. A batch-type asphalt mixing plant according to claim 2, wherein the thermal aggregate buffer bins comprise a sand buffer bin (63) and a plurality of stone buffer bins (64), the thermal aggregate reduction weighing hoppers comprise a sand reduction weighing hopper (65) and a stone reduction weighing hopper (66), the sand reduction weighing hopper (65) is arranged at the bottom of the sand buffer bin (63), the stone reduction weighing hopper (66) is arranged at the bottom of the stone buffer bin (64), and the sand reduction weighing hopper (65) and the stone reduction weighing hopper (66) are connected with the feeding end of the premixing device (7) through a first conveying device (67).

5. An intermittent asphalt mixing plant according to claim 1, wherein said powder feeder (2) comprises a powder storage bin (21) and a fine sand storage bin (22), the bottoms of said powder storage bin (21) and said fine sand storage bin (22) are respectively provided with a powder decrement measuring hopper (23) and a fine sand decrement measuring hopper (24), and said powder decrement measuring hopper (23) and said fine sand decrement measuring hopper (24) are connected with the feeding end of said premixing device (7) through a second conveyor (25).

6. A batch asphalt mixing plant according to claim 1, wherein said first transfer device (5) and said second transfer device (8) are both hoists.

7. A batch asphalt mixing plant according to claim 1, wherein said aggregate feeding means (1) comprises a plurality of cold aggregate storage bins, and cold aggregate reduction weighing hoppers are provided below said cold aggregate storage bins, each cold aggregate reduction weighing hopper being connected to the feed end of said drying means (4) by a third conveyor means (11).

8. The batch asphalt mixing plant according to claim 7, wherein the plurality of cold aggregate storage bins comprise a sand storage bin (12) and a plurality of stone storage bins (13), the plurality of cold aggregate reduction weighing hoppers comprise a sand weighing hopper (14) and a stone weighing hopper (15), the sand weighing hopper (14) is arranged at the bottom of the sand storage bin (12), the stone weighing hopper (15) is arranged at the bottom of the stone storage bin (13), and the sand weighing hopper (14) and the stone weighing hopper (15) are connected with the feeding end of the drying device (4) through the third conveying device (11).

9. A batch asphalt mixing plant according to claim 1, characterized in that said mixing and mixing device (9) comprises a mixer body (91), said mixer body (91) being connected with a medium hopper (92) and a finished product bin (93), said medium hopper (92) being connected with a second transfer device (8).

10. A batch asphalt mixing plant according to claim 9, characterized in that said asphalt feeding means (3) comprises an asphalt measuring hopper (31), said asphalt measuring hopper (31) being connected to a mixer body (91), said mixer body (91) being connected to a water measuring hopper (32) and an admixture measuring hopper (33).