JPH08260415A - Drier for reproducing asphalt-pavement waste material - Google Patents

Abstract

PURPOSE: To prevent the adhesion of a waste material on the internal surface of a drum extremely by heating a drum wall from the outside and elevating the temperature of the drum wall. CONSTITUTION: Electric heaters 13 for heating are provided around the outer circumferential wall of a drum 2. A trolley wire 15 as a power supply path is surrounded circumferentially around the electric heaters 13 and fixed onto the drum 2, and the electric heaters 13 and the trolley wire 15 are connected by conductors. A feeding trolley 17 supplying power is disposed slidably to the trolley wire 15. The electric heaters 13 on the drum 2 turned by the feeding trolley 17 is supplied with power by the feeding trolley 17, and a drum wall is heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for recycling waste asphalt pavement, which heats and recycles waste pavement material.

[0002]

2. Description of the Related Art A dryer having almost the same structure as that of a new aggregate heating dryer of an asphalt plant is used for recycling asphalt pavement waste materials (hereinafter referred to as "waste materials") dug up by road construction or the like. This regeneration dryer rotatably supports a cylindrical drum, and the hot air sent from the burner while rolling down the waste material while scraping up the scrap material with a large number of scraping blades installed around the inner circumference of the drum. The waste material is regenerated by heating it to a desired temperature.

When the waste material is heated and regenerated by the dryer, the asphalt adhering to the surface of the waste material is melted while the waste material is rolling down in the drum while being heated, so that the waste material becomes adhesive. This adhesive waste material may gradually adhere to and grow on the scraping blades and the inner circumference of the drum, and eventually impair the function of the scraping blades.As a preventive measure, for example, a chain loosened on the scraping blades may be used. You can also see that there is a movable scraping blade to prevent the sticking by giving a shock to the scraping blade and the inner peripheral wall of the drum when the drum rotates.

[0004]

However, when the asphalt component melts and tries to adhere to it, the adhesive force of the waste material is quite strong, and the impact of a chain or the like is often applied to a specific location, so that it is not directly ejected. Adhesive deposits may occur at the location. Once attached and deposited, it becomes difficult to separate them by the impact force of a chain or the like.

Therefore, in order to remove the adhered and deposited waste material, an operator enters into a narrow drum to carry out a shaving operation, which causes a problem in maintenance.

In view of the above points, the present invention prevents the waste material from adhering and depositing in the drum as much as possible, and even if the adhering and depositing occurs, the waste material can be easily removed from the outside of the drum. The purpose is to provide a dryer for use.

[0007]

In order to achieve the above object, the present invention provides a dryer for asphalt pavement waste material recycling according to claim 1, wherein a cylindrical drum is rotatably supported in an inclined manner, and hot air is blown into the drum. In addition to supplying asphalt pavement waste material and heating and recycling the waste material, in a dryer for asphalt pavement waste material regeneration, a heater for heating is provided around the outer peripheral wall of the drum along the circumferential direction, and the heater for heating is surrounded. A power supply path for power supply is provided around and fixed to the drum, and while the heater for heating and the power supply path are connected by an electric conductor, power is supplied while abutting on the power supply path and sliding in the vicinity of the power supply path. It is characterized by arranging a power supply body for supplying.

The drier for reclaiming asphalt pavement waste material according to claim 2 is a asphalt pavement waste material in which a cylindrical drum is rotatably supported in an inclined manner, and asphalt pavement waste material is supplied together with hot air into the drum and the waste material is heated and regenerated. In the regeneration dryer, a heater for heating is provided around the outer peripheral wall of the drum along the circumferential direction, and a power supply path for supplying power is provided so as to surround the heater for heating. Is characterized in that a current collector for collecting electric power while abutting on the power supply path and sliding is arranged.

[0009]

According to the dryer for recycling asphalt pavement waste material according to the first aspect of the present invention, the drum 2 is rotated while the drum 2 is rotated by supplying electric power to the power feeding path provided along the outer peripheral wall of the drum through the power feeding body. The drum 2 can be heated by an electric heater provided along the outer peripheral wall of 2, thereby heating the waste material to be deposited and deposited to further melt the asphalt content and reduce its viscosity,
The adhesive strength of the waste material is weakened to prevent adhesion and deposition, and the temperature of the drum wall is raised to prevent asphalt from adhering to the drum.

Further, according to the dryer for reclaiming asphalt pavement waste material according to the second aspect of the present invention, the electric power is supplied to the power feeding path provided around the outer peripheral wall of the drum to thereby collect the current collected in the heating heater. Electric power can be supplied to the electric heater through the body, the peripheral wall of the drum can be heated while rotating the drum, and the waste material to be deposited and deposited can be heated to melt the asphalt further in the same manner as described above. Its viscosity is reduced and the adhesive force of the waste material is weakened to prevent adhesion and deposition.

[0011]

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

Reference numeral 1 denotes a waste material recycling dryer which heats and recycles waste material, in which a cylindrical drum 2 is rotatably supported by a supporting roller 4 on a machine base 3 in a tilted manner, and is driven by a driving device (not shown) to a predetermined position. Rotating at speed.

Reference numeral 5 is a burner for generating hot air arranged below the drum 2, and a combustion chamber 6 for forming a flame is arranged in front of the burner 5. A hot air passage 7 is provided in the combustion chamber 6.
And the hot air passage 7 is raised upward,
The hot hopper 8 arranged at one end of the drum 2 has its tip end opened so that the hot air generated by the burner 5 is sent into the drum 2.

The hot air passing through the inside of the drum 2 is connected to a cold hopper 9 arranged at the other end of the drum 2 so that the exhaust flue 1
The exhaust gas is discharged from the drum 2, and the exhaust gas is sucked by an exhaust fan (not shown) arranged at the end of the exhaust flue 10 to maintain the gas flow passing through the drum 2. 2 is passed through a dust collector (not shown) disposed downstream of the nozzle 2 and released into the atmosphere.

Reference numeral 11 denotes a waste material charging chute for charging the waste material into the drum 2. The waste material charged into the drum 2 from the waste material charging chute 11 passes through the drum 2 while rolling down in the drum 2. It comes into contact with the hot air that is generated, is heated to a desired temperature, and is discharged from the waste material discharge port 12 below the cold hopper 9.

Reference numeral 13 denotes an electric heater for heating, which is circumferentially wound around the outer peripheral wall of the drum 2 near the non-return blade on the material input side of the drum 2, and dissipates heat to the outside of the drum 2 during heating. It is covered with a heat insulating material 14 in order to prevent the heat.

The material input side of the drum 2 is an example in which an electric heater is attached to this area in order to hinder the material supply when waste material adheres and deposits. The mounting position of the electric heater 13 may be properly mounted not only in this region but also in a position where waste material is easily attached.

The electric heater 13 is provided around the electric heater 13.
A trolley wire 15 serving as a power supply path is provided so as to surround the trolley wire. The trolley wire 15 is formed by annularly forming a copper rod or the like serving as an electric conductor and attached to the drum 2 by a heat resistant insulator 16. The electric heater 13 and the trolley wire 15 are connected by an electric wire which is an electric conductor.

Further, the trolley wire 15 is provided with a power feeding trolley 17 which is a power feeding body, and the power feeding trolley 17 is in contact with the trolley wire 15 and slides 18 for feeding electric power while sliding. The sliding portion 18 is composed of a power feeding arm 19 which is swingable so as to bring the sliding portion 18 into contact with the trolley wire 15 with an appropriate force. The sliding portion 18 is connected with a power feeding line 20 connected to a power source. Then, the electric power sent from the sliding portion 18 is sent to the electric heater 13 via the trolley wire 15.

Reference numeral 21 denotes a power controller for connecting and disconnecting the power inserted in the power supply line 20, and supplies it to the electric heater 13 based on, for example, the surface temperature of the peripheral portion of the electric heater 13 or the temperature inside the drum. The power is intermittent and the temperature is controlled.

FIG. 3 shows another embodiment of the present invention. A trolley wire 15 'serving as a power feeding path is provided around the electric heater 13' so as to surround the electric heater 13 '. The trolley wire 15 'is formed by forming a copper rod or the like, which is an electric conductor, in an annular shape, and providing a power line connecting terminal for connecting an end of a power line connected to a power source at an appropriate position.

Further, the electric heater 13 'has an electric heater 1
A current collecting trolley 22 which is a current collector for collecting electric power is provided in 3 ', and the current collecting trolley 22 has a sliding portion for collecting electric power while sliding on the trolley wire 15' at one end thereof. 23 and a current collecting arm 2 which is swingable so that the sliding portion 23 is brought into contact with the trolley wire 15 'with an appropriate force.
4 and the electric power taken in from the sliding portion 23 is connected by an electric wire which is an electric conductor mounted between the sliding portion 23 and the electric heater 13 '. Then, the trolley wire 15 'is connected to a power supply line 20' connected to a power source. In addition, the power supply line 20 'is provided with a power controller 21' for connecting and disconnecting the power and controlling the temperature.

Therefore, when the waste material is heated and regenerated by the waste material regeneration dryer 1, the drum 2 is rotated and the burner 5 is rotated.
By this, hot air is sent into the drum 2 and the power controller 21 is operated to energize the power feeding trolley 17. The power supply trolley 17 is in contact with the trolley wire 15 arranged on the outer peripheral portion of the drum 2 and is rotating.
Power is supplied to the trolley wire 15 through 7. When power is supplied to the trolley wire 15, electric power is supplied to the electric heater 13 connected to the trolley wire 15 to heat the drum 2 from the outer peripheral wall.

Next, when the supply of the waste material into the drum 2 is started, the waste material comes into contact with the hot air passing through the drum 2 while rolling down in the drum 2 while being scraped up by the scraping blades in the drum 2. Then, the temperature is raised to the desired temperature.

When the waste material is supplied into the drum 2, the asphalt content in the waste material begins to be melted in the vicinity of the material feeding section, and the adhesive strength of the asphalt content becomes considerably strong. Then, the non-return blades try to adhere and accumulate, but by heating such an area by the electric heater 13 in advance, it is possible to prevent the waste material from adhering as much as possible.

Normally, the electric heater 13 is operated without being energized, and when the waste material adheres to the scraping blades or the like, the electrothermal heater 13 is energized to heat the adhering portion to remove the asphalt content of the adhered waste material. May be melted and peeled off from a scraping blade or the like.

Further, in another embodiment of the present invention shown in FIG. 3, the power controller 21 'is operated to first energize the trolley wire 15'. The current collecting trolley 22 is in contact with the trolley wire 15 ′ and is rotating,
2, the electric power is collected from the trolley wire 15 '. Then, the electric power collected by the current collecting trolley 22 is supplied to the electric heater 13 'to heat the drum 2 from the outer peripheral wall side of the drum 2, thereby preventing the adhesion of the waste material as much as possible.

[0028]

As described above, in the dryer for reclaiming asphalt pavement waste according to the first aspect of the present invention, the electric heater 13 for heating is provided around the outer peripheral wall of the drum 2, and the electric heater 13 is heated. Trolley wire 1 which is a power supply path around the
5, the electric heater 13 and the trolley wire 15 are connected to each other by an electric conductor, and the feeding trolley 17 which is a feeding body for supplying electric power to the trolley wire 15 is slidably arranged. The drum wall can be appropriately heated to raise the temperature, and the adhesion of waste material to the inner peripheral surface of the drum can be prevented as much as possible.

Further, in the asphalt pavement waste material recycling dryer according to a second aspect of the present invention, an electric heater 13 'for heating is circumferentially provided on the outer peripheral wall of the drum 2 along the circumferential direction. A trolley wire 15 'serving as a power supply path is provided around the heater 13', and a current collecting trolley 22 serving as a current collector is provided in the electrothermal heater 13 '. Therefore, the drum wall is appropriately heated to raise the temperature. It is possible to prevent the waste material from adhering to the inner peripheral surface of the drum as much as possible.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a dryer of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dryer for recycling waste materials 2 ... Drums 13 and 13 '... (for heating) electric heaters 15 and 15' ... Trolley wire (power supply path) 17 ... Power supply trolley (power supply body) 22 ... Current collection trolley (current collector)

Claims (2)

[Claims] 1. A cylindrical drum is rotatably supported in an inclined manner,
Supply asphalt pavement waste with hot air into the drum,
In an asphalt pavement waste material recycling dryer that heats and recycles the waste material, a heater for heating is provided around the outer peripheral wall of the drum along the circumferential direction, and a power supply path for power supply is provided so as to surround the heater for heating. The heater is provided around the drum and fixed to the drum, and the heater for heating and the power feeding path are connected by an electric conductor. On the other hand, a power feeding body is provided near the power feeding path to contact the power feeding path and slide to supply power. A dryer for recycling waste asphalt pavement that is characterized by 2. A cylindrical drum is rotatably supported in an inclined manner,
Supply asphalt pavement waste with hot air into the drum,
In an asphalt pavement waste material recycling dryer that heats and recycles the waste material, a heater for heating is provided around the outer peripheral wall of the drum along the circumferential direction, and a power supply path for power supply is provided so as to surround the heater for heating. A dryer for recycling asphalt pavement waste, which is provided around the heating heater, and a current collector that collects electric power while sliding in contact with a power feeding path.