JPH0512323Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a dryer for an asphalt plant that manufactures asphalt mixture, which is a road paving material, and is particularly suitable for heating both new aggregate and asphalt pavement waste. This relates to a dryer that can.

[Prior art] Asphalt pavement waste material (hereinafter referred to as "waste material") dug up during road construction, etc. is being heated and regenerated and reused as asphalt composite material. It has almost the same structure as a dryer, which is generally an aggregate heating device in an asphalt plant. When recycling waste materials by heating, it is important not to heat the asphalt contained in the waste materials more than necessary. Therefore, when heating new aggregates, a countercurrent heating method is adopted in which high-temperature gas is sent in the opposite direction to the direction of movement of the aggregates, whereas when heating waste materials, the movement of the waste materials It is generally considered preferable to employ a parallel current heating method in which relatively low-temperature gas is fed in the same direction as the heating direction. As the preferred heating methods for new aggregate and waste material are different in this way, there are dryers dedicated to heating new aggregate and dryers dedicated to heating and recycling waste materials that adopt the respective heating methods, but it is not possible to use the same dryer for each. Installing it on the factory premises poses a heavy economic burden. Therefore, there is a need to develop a dryer that can heat both materials with a single dryer. As an example of such a dryer, as described in Japanese Utility Model Application Publication No. 193109/1988, which was previously filed by the present applicant, a single drum is horizontally supported so as to be rotatable in forward and reverse directions, and one end of the drum on the burner side is A waste material input chute is installed at the end of the drum on the opposite side of the burner, and a new aggregate input section is installed at the other end of the drum on the opposite side of the burner.When the drum rotates forward, the new aggregate is heated in a countercurrent manner, and when the drum rotates in the reverse direction, the waste material is heated in a countercurrent manner. There is a hair dryer that can be heated.

[Problem to be solved by the invention] However, in the dryer, it is impossible to heat both new aggregate and waste material at the same time, and only one of the materials can be heated. .

Therefore, in consideration of the above points, the present invention has been devised so that new aggregate can be heated in a counter-current manner and waste materials can be heated in a parallel-current manner using a single dryer. The purpose of this invention is to propose a dryer that can also heat the air.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a cold hopper having a flue at one end of a rotatably horizontally supported drum. Two rows of through holes are drilled at appropriate intervals along the hopper side, and each of the through holes is surrounded from the outer periphery by a cover body, and a new aggregate input section is installed at the top of the cover body located on the hot hopper side. The raking blades are installed around the inner circumference of the drum and are located on the cold hopper side. A waste material input section is provided at the top of the cover body, and scraping blades are provided around the inner circumference of the drum, slanting in a direction that allows the input waste material to proceed to the waste material discharge section located at the bottom of the cold hopper. The present invention provides a dryer for asphalt plants.

[Operation] According to the present invention, high-temperature gas generated by a burner disposed on the hot hopper side at one end of the drum is sent into the drum and led to the exhaust flue disposed on the cold hopper at the other end. On the other hand, new aggregate is introduced from a new aggregate inlet provided on the hot hopper side of a cover body that surrounds two rows of through holes at appropriate intervals along the peripheral wall near the center of the drum from the outer periphery. When the new aggregate is fed into the drum, the new aggregate is scraped up by the raking blades arranged on the inner circumference of the drum and inclined at an appropriate angle toward the hot hopper, and rolls down toward the new aggregate discharge port arranged in the hot hopper. During this time, it is heated to a predetermined temperature. Further, when waste material is inputted from the waste material inputting part provided on the cold hopper side of the cover body, the waste material is raked up by the raking blades provided on the inner circumference of the drum and inclined at an appropriate angle toward the cold hopper side. It is heated to a predetermined temperature while rolling and flowing down toward the waste material discharge port provided on the side. Therefore, even in a single drum, it is possible to simultaneously heat new aggregate using a countercurrent heating method and waste material using a cocurrent heating method using hot air at a reduced temperature, and it is also possible to heat only one of the materials. be.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a dryer for heating new aggregate and waste materials, in which a cylindrical drum 2 is rotatably supported horizontally by a support roller 4 on a machine base 3, and a predetermined temperature is controlled by a drive device (not shown). rotating at speed. 5
is a burner installed at one end of the drum 2, which sends high-temperature gas into the drum 2 via a hot hopper 6, and is installed at the end of an exhaust flue 8 connected to a cold hopper 7 at the other end of the drum 2. A hot gas flow is maintained through the drum 2 by suctioning the gas by an exhaust fan (not shown). Reference numeral 9 denotes through holes bored at appropriate intervals in the peripheral wall of the drum 2 near the center thereof, and the through holes 9 are surrounded by a cover body 10 which is fixed and separated from the drum 2 from the outer periphery. A new aggregate feeding chute 11 is disposed at the upper part of the cover body 10, passing through the cover body 10 and having its tip facing the through hole 9. 12a-12c
is an aggregate hopper that stores new aggregate according to various particle sizes, and the feeder 1 is cut from the aggregate hopper 12.
3a to 13c cut out a predetermined amount of new aggregate, convey it to the new aggregate inputting chute 11 via the conveyor 14, and input the waste material into the drum 2 through the through hole 9 bored in the rotating drum 2. . The new aggregate introduced into the drum 2 is raked up by the raking blades 15 which are inclined to advance the new aggregate in the direction of the hot hopper 6 on the inner peripheral wall of the drum 2 while moving inside the drum 2 toward the hot hopper 6 side. While rolling and flowing down, the aggregate is heated to a predetermined temperature and discharged from the new aggregate discharge port 16 at the bottom of the hot hopper 6. On the other hand, reference numerals 17 denote through holes which are similarly bored at appropriate intervals in the peripheral wall of the drum 2 at an appropriate distance on the cold hopper 7 side from the through holes 9 which are bored at appropriate intervals in the peripheral wall near the center of the drum 2. and the through hole 17
is surrounded by a cover body 18 which is separated from the drum 2 from the outer periphery and fixed. A waste material inputting chute 19 is disposed at the upper part of the cover body 18, passing through the cover body 18 and having its tip facing the through hole 17. 20a and 20b are waste material hoppers that store waste materials according to various particle sizes;
A predetermined amount of waste material is cut out from the cutting feeder 20b by the cutting feeders 21a and 21b, and conveyed to the waste material inputting chute 19 via the conveyor 22.
Put it inside. The input waste material is rolled down inside the drum 2 toward the cold hopper 6 side while being scraped up by scraping blades 23 which are inclined on the inner peripheral wall of the drum 2 so as to advance the waste materials in the direction of the cold hopper 7. The waste material is heated to a predetermined temperature and discharged from the waste material discharge port 24 at the bottom of the cold hopper 7.

When heating new aggregate and waste material at the same time, the drum 2 is rotated in a fixed direction while the burner 5 is combusted to send high-temperature gas into the drum 2. New aggregate is fed into the drum 2 from a new aggregate input chute 11 disposed near the drum 2, and waste material is fed into the drum 2 from a waste material input chute 19. The new aggregate rolls down the drum toward the flame of the burner 4, is heated to a predetermined temperature by a countercurrent heating method, and is discharged from the new aggregate discharge port 16. Further, the waste material tumbles down in the same direction as the gas flow, passes through the new aggregate heating area, is heated to a predetermined temperature by the cocurrent heating method by the hot air whose temperature has decreased, and is discharged from the waste material discharge port 24.

It is needless to say that the dryer of the present invention can heat either new aggregate or waste material independently.

[Effects of the invention] As described above, in the dryer of the invention, the new aggregate injection chute 1 is located approximately at the center of the drum 2.
1 and a waste material input chute 19 are installed, and the drum 2
Scraping blades 15 and 23 inclined at an appropriate angle are installed around the inner circumferential wall of the drum 2 so that the new aggregate rolls down to the hot hopper 6 side and the waste material rolls down to the cold hopper 7 side while rotating in a constant direction. , the new aggregate is heated countercurrently by a single dryer,
Waste materials can be heated efficiently using the parallel current heating method. Further, both the new aggregate and the waste material can be heated simultaneously, or each material can be heated individually.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic front view of an embodiment of the dryer of the present invention, and FIG. 2 is an enlarged sectional view taken along the line A--A in FIG. 1. 1...Dryer, 2...Drum, 5...Burner, 6...Hot hopper, 7...Cold hopper, 9...Through hole, 10...Cover body, 11...New aggregate input chute, 12a to 12c... ... Aggregate hopper, 15 ... Raking blade, 16 ... New aggregate discharge port, 17 ... Through hole, 18 ... Cover body, 19
...Waste material input chute, 20a-20b...Waste material hopper, 23...Rake-up blade.

Claims (1)

[Scope of utility model registration request] A hot hopper with a burner is installed at one end of a rotatably horizontally supported drum, and a cold hopper with an exhaust flue is installed at the other end. Two rows of holes are drilled, each of the through holes is surrounded by a cover body from the outer periphery, and a new aggregate input part is provided at the upper part of the cover body located on the hot hopper side, and the new aggregate introduced is poured into the lower part of the hot hopper. Scraping blades are provided around the inner periphery of the drum, sloping in the direction of advancing the new aggregate to the new aggregate discharge section located at the center, and a waste material input section is disposed on the upper part of the cover body located on the cold hopper side. A dryer for an asphalt plant, characterized in that scraping blades are provided around the inner periphery of the drum, the blades being inclined in the direction of advancing the input waste material to the waste material discharge port located at the bottom of the cold hopper.