JPH01235705A - Dryer for asphalt plant - Google Patents

Abstract

PURPOSE:To contemplate simplification of a device structure and saving of an installation space, by heating fresh aggregates and spent aggregates together in only one drying drum. CONSTITUTION:A drum 3 is provided at one end with a hot hopper 6 having a burner 7 for heating aggregates, and at the other end with a cold hopper 10 having a flue gas duct 11. Two rows of through-holes 15 and 16 are formed on the drum 3 circumferentially along and in the vicinity of a lateral center thereof, and surrounded and closed with cover members 18, respectively. A feed inlet 19 for fresh aggregates is provided on the cover member 18 disposed on the hot hopper side, while an outlet 8 for the fresh aggregates is formed on the lower part of the hot hopper 6. On the other hand, spent material is fed through an inlet 25 of the cold hopper 10 into the drum and discharged through an outlet 30 formed on the lower part of the cover member on the cold hopper side. Moreover, in a dryer apparatus 1 for an asphalt plant, an inner tube member 9 is disposed within the drum 3 to branch the hot air supplied from the hot hopper.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a dryer that is an aggregate heating device for an asphalt plant that produces asphalt mixture that is a path paving material, and particularly relates to a dryer that is an aggregate heating device for an asphalt plant that produces asphalt mixture that is a path paving material. The present invention relates to a dryer that can be heated.

[Prior art] Asphalt pavement waste materials (hereinafter referred to as "waste materials") dug up during road construction, etc. are being heated and regenerated and reused as asphalt mixture, and devices for heating this waste material are - For sterilization, a device with almost the same structure as a dryer, a new aggregate heating device for asphalt plants, is used. The dryer for heating waste materials is often installed alongside the dryer of an asphalt plant.

[Problem to be solved by the invention] However, if a dryer for heating new aggregates and a dryer for heating waste materials are installed together on the same factory premises, the configuration and arrangement of the equipment will become complicated, making it difficult to use the site area effectively. Can not.

Therefore, in view of the above points, the present invention aims to propose a dryer that can heat both new aggregate and waste materials with a single drum.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a hot hopper having an aggregate heating burner at one end and a cold hopper having an exhaust flue at the other end. Then, two rows of through holes are bored at appropriate intervals along the circumferential wall of the drum, which is rotatably supported in an inclined manner, at an appropriate interval. A new aggregate input section is installed at the top of the cover body located on the burner side, and a new aggregate discharge section is installed at the bottom of the hot hopper. An asphalt plant characterized in that a waste material discharge port having a discharge gate is disposed in the lower part of the cover body located on the side, and a cylindrical body for passing hot air in a divided manner is inserted in the front half of the drum near the burner. dryer.

[Function] According to the present invention, when new aggregate and waste material are heated simultaneously, the discharge gate at the lower part of the cover body located on the cold hopper side near the center of the drum is opened, and one end of the drum is heated. High-temperature hot air generated by the aggregate heating burner installed at the drum is sent into the drum and led out to the exhaust flue installed at the cold hopper at the other end, while the hot air at the hot hopper side near the center of the drum is New aggregate is supplied into the drum from the new aggregate supply section on the upper part of the cover body, and while flowing down the front half of the drum near the burner, it is heated to the desired temperature by exchanging heat with hot air, and is heated to the desired temperature at the bottom of the hot hopper. Discharge from the new aggregate discharge port. In addition, while the waste material is supplied into the drum from the cold press machine side and transferred down the rear half of the drum, the hot air passing through the cylindrical body inserted into the front half of the drum and the outside of the cylindrical body The waste material is heated to the desired temperature by the heated air, which has been adjusted to a temperature that does not heat the waste material more than necessary, by mixing it with hot air that has lowered its temperature by exchanging heat with the new aggregate. through the waste material outlet at the bottom of the cover body.

In addition, when heating only new aggregate, close the discharge gate at the bottom of the cover near the center of the drum to prevent aggregate from flowing out from the waste material discharge port, while heating one end of the drum. While the aggregate heating burner sends high-temperature hot air into the drum, new aggregate is supplied from the cold hopper side, and some of the aggregate that falls through the hole drilled near the center of the drum is transferred to the lower part of the cover body. The heated aggregate is heated to a desired temperature while being stored in the drum and flowing down the drum, and the heated aggregate is discharged from the new aggregate discharge port at the bottom of the hot hopper.

[Example] Embodiments of the present invention will be described below based on the drawings.

■ is a dryer that heats new aggregate and waste materials, and is a cylindrical drum 3 with a large number of scraping blades 2 installed around it.
is tilted and rotatably supported by support rollers 5 on a machine stand 4, and is rotated at a predetermined speed by a drive device (not shown). Reference numeral 6 denotes a hot hopper disposed at one end of the drum, and the hot hopper 6 is equipped with an aggregate heating burner 7 that sends hot air into the drum 3, and the lower part of the hot hopper 6 is equipped with heated new bone. A new aggregate discharge port 8 for discharging aggregate material is formed. A cylindrical body 9 of an appropriate diameter is inserted into the front half of the drum 3 near the burner 7 to separate the hot air generated by the burner 7 and allow a part of the hot air to pass through the rear half of the drum 3 while maintaining a high temperature. It is set up.

A cold hopper 10 is arranged at the other end of the drum 3,
An exhaust flue 11 is connected to the cold hopper 10 for discharging the exhaust gas that has passed through the drum 3, and downstream of the exhaust flue 11 there is a dust collector 12 for catching scattered dust, and a dust collector 12 for collecting the scattered dust. An exhaust fan 13 is provided.

A weir 1 of an appropriate height is installed on the inner wall near the center of the drum 3.
4 are provided around the drum 3, and two rows of through holes 15 and 16 are bored at appropriate intervals along the peripheral wall of the drum 3 sandwiching the weir 14,
Each of the through holes 15 and 16 is surrounded by a cover body 17 and 18 that is fixed and separated from the drum 3 from the outer periphery. Reference numeral 19 denotes a chute for introducing new aggregate arranged at the upper part of the cover body 17, and its tip passes through the cover body 17 and faces the through hole 15 drilled in the drum 3, so that the new aggregate is introduced through the chute. The new aggregate is fed into the drum 3 through the hole 15, and a guide chute 20 is attached to the through hole 15 so that the new aggregate can be fed smoothly into the drum 3. 21a-21
d is an aggregate hopper that stores new aggregate on the side of various particle sizes, and feeders 22a to 22d cut out a predetermined amount of new aggregate from the aggregate hopper and input the new aggregate via conveyors 23 and 24. The liquid is supplied to a chute 19 for use. 25a to 25b are waste material hoppers that store waste materials on the side of various particle sizes, and the waste material hoppers 25a to 25
A predetermined amount of waste material is cut out from the feeders 26a and 26b from the waste material 26a and 26b, and is fed into the drum 3 via a conveyor 27 and a conveyor 28.

In addition, when only new aggregates stored in the aggregate hoppers 21a to 21d are heated, the amount of aggregate supplied into the drum 3 increases, so in order to heat efficiently, it is necessary to supply the aggregate from the cold hopper lO side. Another conveyor (not shown) is interposed between the conveyor 22 and the conveyor 27 as shown by a dotted line. A waste material discharge port 30 having a discharge gate 29 for discharging waste material supplied into the drum 3 and heated to a desired temperature to the outside is formed in the lower part of the cover body 18 near the center of the drum 3.

When heating new aggregate and waste material at the same time, the discharge gate 29 at the bottom of the cover body 18 located on the cold hopper 1o side near the center of the drum is opened, and the burner 7 for heating the aggregate is heated inside the drum 3. Aggregate hoppers 21a to 21d store new aggregate on the side of various particle sizes while sending hot air into the
A predetermined amount of new aggregate cut out from the feeders 22a to 22d is supplied to the new aggregate input chute 19 near the center of the drum 3 via the conveyor 23, 24, and is transferred and flowed down inside the front half of the drum 3. The new aggregate is heated to a desired temperature and discharged from the new aggregate outlet 8 at the bottom of the hot hopper 6. In addition, a feeder 26 is provided for cutting out waste materials from waste material hoppers 25a and 25b that store waste materials on the side of various particle sizes.
A and 26b cut out a predetermined amount of waste material, and convey it to the drum 3 from the cold hopper side 10 via conveyors 27 and 28.
supply within. Heat is exchanged between the hot air that maintains a high temperature and passes through the cylindrical body 9 inserted into the front half of the drum 3 and the new aggregate on the outside of the cylindrical body 9. The waste material flowing down the rear half of the drum 3 is heated to a desired temperature by mixing with hot air whose temperature has been lowered and adjusted to a temperature that does not overheat the waste material more than necessary, and the waste material is then drilled along the peripheral wall of the drum 3. cover body 1 through the through hole 16
The waste material is discharged from the waste material discharge port 30 at the bottom of 8. At this time, the weir 14 provided around the inner circumferential wall near the center of the drum 3 effectively acts to ensure that the advancing waste material falls into the through hole 16.

When only new aggregate is heated, the discharge gate 29 of the waste material discharge port 30 near the center of the drum 3 is closed, and hot air is sent into the drum 3 by the aggregate heating burner 7.
Aggregate hoppers 21a to 21d that store aggregate on the side of various particle sizes
A predetermined amount of new aggregate is cut out by the cutting feeders 22a to 22d from the conveyor 23 to the conveyor 28 as shown by the dotted line, and the supply destination is switched by another conveyor (not shown) and fed to the cold hopper IO side. The supplied new aggregate flows down while being heated in the rear half of the drum 3, and when it reaches the vicinity of the center of the drum 3, a part of it flows into the cover body 18 through a through hole 16 bored in the peripheral wall of the drum 3. It falls and accumulates in the lower part of the cover body 18 and the waste material discharge port 29, but most of it passes over the weir 14tt provided around the inner circumferential wall of the drum 3 and advances to the front half of the drum 3. A part of the aggregate falls to the outside of the drum 3 through the through hole 15 bored in the peripheral wall near the center of the drum 3 and accumulates at the bottom of the cover body 17, but is scraped up by the guide chute 20. It is returned into the drum 3.

The aggregate is heated to a desired temperature while flowing down the drum 3 toward the burner 7, and is discharged from the new aggregate discharge port 8 at the bottom of the hot hopper 6.

[Effect of the Invention J As described above, in the dryer of the present invention, both new aggregate and waste materials can be heated simultaneously with a single drum, or each material can be heated individually.
In addition, since the device can be made compact, the configuration and arrangement of the device can be simplified and space can be saved.

[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... Dryer 2... Scraping blade 3... Drum 6... Hot hopper 7... Burner for heating aggregates 8... New aggregate discharge port 9... Cylindrical body 10.・
・Cold hopper 11...Exhaust flue 15.16...
・Through hole 17.18... Cover body 19... Chute for introducing new aggregate 21a to 21d... Aggregate hopper 2
5a-25b...Waste material hopper 29...Discharge gate 30...Waste material discharge port

Claims (1)

[Claims] A hot hopper with a burner for heating aggregates at one end and a cold hopper with an exhaust flue at the other end are installed along the peripheral wall of the drum near the center of the drum, which is rotatably supported at an angle. Two rows of through holes are drilled at appropriate intervals, each of the through holes is surrounded by a cover body from the outer periphery, and a new aggregate input part is placed in the upper part of the cover body located on the aggregate heating burner side, and the hot hopper is inserted into the hot hopper. A new aggregate discharge port is provided at the bottom, and a waste material supply section that can also supply new aggregate to the cold hopper is provided, while a waste material discharge port with a discharge gate is provided at the bottom of the cover body located on the cold hopper side. A dryer for an asphalt plant, characterized in that a cylindrical body is inserted into the front half of the drum near the burner to allow hot air to pass through in a divided manner.