JPH09177020A - Mixing adjustment mixer for asphalt mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a thermometer, which measures the temp. of asphalt mixture for mixing adjustment, from being affected by impact of or friction with aggregate etc. SOLUTION: A thermometer accommodation chamber 7 for a radiation themometer 8 is installed in a position confronting the inside of mixer 1. The chamber 7 is provided with a temp. measuring hole 6 directed to the inside of the mixer 1, and the hole 6 is fitted with a shutter 10 as capable of being opened and closed. When a heated aggregate, molten asphalt, etc., is to be cast into the mixer 1, the shutter 10 is closed so as to block the hole 6, and thereby the thermometer 8 is protected against dust or vapor produced in the mixer 1. The shutter 10 is opened when the dust and vapor in the mixer 1 have become lean, and the temp. of the asphalt mixture is measured by the thermometer 8 contactlessly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer which is installed in an asphalt plant for producing an asphalt mixture as a road pavement material and controls mixing of the asphalt mixture.

[0002]

2. Description of the Related Art Asphalt mixtures, which are road paving materials, are generally produced by asphalt plants. This asphalt plant is composed of a dryer that heats the aggregate that is the material of the asphalt mixture and the plant body.The plant body is heated and dried by the dryer, and the aggregate lifted to the top of the plant body is sieved by particle size. An oscillating sieve for dividing is installed, and an aggregate storage bin for storing the aggregate sieved by the oscillating sieve according to the particle size is arranged below the oscillating sieve. An aggregate weighing tank for measuring a predetermined amount of aggregate discharged from the aggregate storage bin, and a stone powder measuring tank and an asphalt measuring tank for measuring a predetermined amount of stone and molten asphalt as other materials are provided below the aggregate storage bin. Has been established. Further below, a mixer for mixing and adjusting the various materials measured by the measuring tanks is provided.

[0003] When there is a request to ship the asphalt mixture, the heated aggregate, stone powder and molten asphalt are weighed based on the composition of the asphalt mixture to be shipped, put into a mixing adjustment mixer, and mixed and adjusted to obtain the desired asphalt. A mixture is manufactured.

At this time, the standard asphalt mixture is mixed and adjusted to have a temperature of about 160 ° C. Since the temperature of the asphalt mixture affects workability on site and quality after construction, It is important to control the temperature when adjusting the asphalt mixture.

Therefore, recently, a mixer in which a temperature sensor such as a thermocouple is attached to the bottom of a mixer for mixing and adjusting an asphalt mixture has come to be seen.

[0006]

However, when the temperature of the asphalt mixture is to be measured using a thermocouple or the like attached to the bottom of the mixer, it is necessary to expose the thermosensitive part of the thermocouple from the bottom of the mixer toward the inside. In addition, the exposed portion is subjected to impact or friction by the asphalt mixture aggregate or the like, and this conventional method may cause a problem that the attached thermometer is worn or damaged.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a mixer for adjusting the asphalt mixture, which can measure the temperature of the asphalt mixture without being affected by aggregates or the like during the adjustment of the asphalt mixture. I do.

[0008]

In order to achieve the above object, the present invention provides a radiation thermometer storage chamber for housing a radiation thermometer facing the inside of a mixer for mixing and adjusting an asphalt mixture. The radiation thermometer housing chamber is characterized in that a temperature measurement port opened toward the inside of the mixer is provided, and an opening / closing shutter for opening and closing the measurement port is provided at the temperature measurement port.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION According to the mixer for adjusting asphalt mixture of the present invention, when the asphalt mixture is mixed and adjusted, the temperature measuring port of the radiation thermometer housing chamber arranged at a predetermined position of the mixer is opened and closed. The shutter is opened and the temperature of the asphalt mixture during mixing adjustment is measured by the radiation thermometer stored in the radiation thermometer storage chamber.

As described above, by measuring the temperature of the asphalt mixture at the time of mixing adjustment with the radiation thermometer, the temperature can be measured without directly contacting the asphalt mixture to be mixed and adjusted with the thermometer. It is possible to solve problems such as wear and breakage due to impact and friction of aggregate, as in the case of measurement with an equivalent temperature sensor.

[0011]

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

In the figure, reference numeral 1 denotes a mixer for mixing and adjusting an asphalt mixture. Two mixer shafts 3 are arranged in parallel in a mixing tank 2 of the mixer 1 and are radially attached to the mixer shaft 3. Attaching the mixing blades 4 to the large number of arms,
The various materials of the asphalt mixture put into the mixing tank 2 are mixed and adjusted by the rotation of.

In the figure, reference numeral 5 denotes a cover provided so as to cover the upper part of the mixing tank 2. A temperature measuring port 6 is formed in a side wall of the cover 5 at a position where the inside of the mixer 1 can be seen. I have. A radiation thermometer storage chamber 7 is attached to the temperature measurement port 6, and a radiation thermometer 8 is stored therein. The temperature measuring port 6 is provided with an opening / closing shutter 10 having an upper end portion having a hinge structure and being rotatable by a cylinder 9.

When the asphalt mixture is mixed and adjusted by the mixer 1, the kneading shaft 3 is rotated to start feeding the measured heated aggregate, stone powder and molten asphalt. At this time, since dust and water vapor are generated from the input material in the mixer 1, the opening / closing shutter 10 is closed and the temperature measurement port 6 is closed.

Then, various materials are charged and mixing adjustment is started, and the cylinder 9 is operated while observing the time when dust and water vapor in the mixer 1 are sucked out of the mixer 1 by a deaerator (not shown), The opening / closing shutter 10 is opened to open the temperature measurement port 6.

In this way, the temperature of the asphalt mixture being mixed and adjusted through the temperature measuring port 6 opened from the radiation thermometer housing chamber 7 by the radiation thermometer 8 with the dust and water vapor in the mixer 1 reduced. Measure without contact. When the temperature measurement is completed, the cylinder 9 is operated again to close the open / close shutter 10 and the temperature measurement port 6 is closed.
To protect the radiation thermometer 8 by preventing dust and water vapor from entering the radiation thermometer storage chamber 7.

[0017]

As described above, in the mixer for adjusting mixing of asphalt mixture according to the present invention, the radiation thermometer storage chamber 7 in which the radiation thermometer 8 is stored in the mixer 1 for mixing adjustment.
Since the opening and closing shutter 10 is provided at the temperature measuring port 6 of the radiation thermometer housing chamber 7 that is open toward the inside of the mixer 1, the temperature of the asphalt mixture to be mixed and adjusted by the mixer 1 is directly applied to the asphalt mixture. The measurement can be performed without contact, and unlike the conventional temperature measurement method using a thermocouple or the like, there is no impact or friction due to the aggregate or the like, and problems such as wear and damage can be solved.

For dust and water vapor generated in the mixer 1, the radiation thermometer housing chamber 7 can be separated from the inside of the mixer 1 by closing the opening / closing shutter 10, and the radiation thermometer 8 can be provided. It protects from dust and water vapor, keeps the operating environment of the radiation thermometer in good condition, and enables stable temperature measurement.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of one embodiment of a mixer for adjusting mixing of an asphalt mixture according to the present invention, which is partially cut away.

[Explanation of symbols]

 1 ... Mixer 6 ... Temperature measuring port 7 ... Radiation thermometer storage room 8 ... Radiation thermometer 9 ... Cylinder 10 ... Opening / closing shutter

Claims (1)

[Claims] 1. A radiation thermometer housing chamber for housing a radiation thermometer is provided facing the inside of a mixer for mixing and adjusting an asphalt mixture, and a temperature opened toward the inside of the mixer is provided in the radiation thermometer housing chamber. A mixer for adjusting mixing of an asphalt mixture, comprising a measurement port and an opening / closing shutter for opening / closing the measurement port at the temperature measurement port.