JP2001059206A - Asphalt plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asphalt plant capable of flexibly corresponding to manufacture of various kinds of diversified special asphalt mixtures so as to enable the grain size of aggregate to change the top size and under size thereof. SOLUTION: Special mixture sieves 6a, 6b and 6c are so arranged that they are inserted in specific positions among sieves 5a, 5b, 5c and 5d of standard meshes arranged in a plurality of stages. Channel changing dampers 8a and 8b for changing channels of aggregate flowing down to partition rooms from a vibration sieve 2 are arranged to the upper parts of the partition rooms 7a, 7b, 7c, 7d and 7e. When a special asphalt mixture is manufactured, the aggregate sieved out at every grain size by the vibration sieve 2 is separated into the aggregates having the grain size necessary for manufacturing a required special asphalt mixture by operating the channel changing dampers 8a and 8b and is stored in the partition rooms 7a, 7b, 7c, 7d and 7e, and it is properly moved to a mixer 10 and is adjustably mixed with stone powder, asphalt or the like to manufacture the special asphalt mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt plant for producing an asphalt mixture as a road paving material.

[0002]

2. Description of the Related Art Asphalt mixtures manufactured in an asphalt plant are often manufactured in a special mixture depending on the intended use. For example, rainwater is prevented from collecting on the surface of a pavement road on an expressway or the like. In order to
Drainable asphalt mixtures have been produced that allow water to penetrate the paved roads while draining the water from the lower subgrade.

[0003] This drainage asphalt mixture contains 13
Aggregate with a particle size of ~ 5mm (80-85% by weight) and 2.5mm
Two types of aggregates are used exclusively with sand (15 to 20% by weight) having a particle size of less than or equal to the particle size. At the time of producing a drainable asphalt mixture, crushed stone 6 (13 to 5 m) stored in an aggregate hopper is used.
a predetermined amount of aggregate at the same time) and sand are supplied to a dryer and heated, and the heated aggregate is supplied to a vibrating sieve at the top of the main body of the plant and sieved according to particle size. It is stored in a storage bin, and the stored two types of aggregate having a particle size of 13 to 5 mm and sand are measured in a predetermined amount in an aggregate measuring tank below the aggregate storage bin, and are dispensed to a mixer. To adjust the mixing to produce a desired drainage asphalt mixture.

[0004] The drainage asphalt mixture has an excellent drainage function because the porosity of the pavement itself is higher than that of a normal asphalt mixture and water penetration is promoted. It also has a low noise function of suppressing noise when the vehicle is running in order to slow down the propagation of sound inside the pavement due to the many voids it has.

As described above, the drainage asphalt mixture has both a drainage function and a low noise function. For example, in order to increase the specific gravity of the drainage function, the undersize of the aggregate particle size is slightly increased from 5 mm. To increase the size to 6 mm or to increase the specific gravity of the low noise function, set the top size of the aggregate particle size slightly smaller than 13 mm to 10 m.
It has been considered that the diameter should be set to m or 8 mm, and in the future, when such a special mixture is to be produced, there is a possibility that the top size and the undersize of the aggregate particle size can be flexibly changed.

[0006]

However, in the conventional vibrating sieve of an asphalt plant, aggregate is usually 25 mm or more (oversize), 25 to 13 mm,
It is general to sieve into five kinds of particle diameters of 3 to 5 mm, 5 to 2.5 mm, and 2.5 mm or less. In this case, a 30-mm square hole (mesh size) is provided on the uppermost aggregate input side. Or a round hole) sieve mesh, the lower stage of which has a mesh size of 16 mm, the lower stage of which has a mesh size of 6 mm, and the lower stage of which has a mesh size of 3 mm. Asphalt plant equipped with a vibrating sieve employing a sieve mesh of the above cannot cope with the production of special asphalt mixtures with an aggregate undersize of 6 mm or a top size of 10 mm or 8 mm. .

[0007] In view of the above, an object of the present invention is to provide an asphalt plant capable of flexibly coping with the production of a wide variety of special asphalt mixtures by changing the top size and undersize of the aggregate particle size. I do.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vibrating sieve for sieving aggregates heated and dried by a dryer through a sieve mesh arranged in a plurality of stages vertically, Aggregate storage bins for storing aggregates sieved by a vibrating sieve in the compartments according to particle size, and an asphalt plant in which an aggregate measuring tank, a mixer, and the like are arranged below the aggregate storage bins are arranged in a plurality of stages. In addition to inserting and arranging a sieve for a special mixture at a predetermined position between sieves of the standard mesh, a flow path changing means for changing a flow path of aggregate flowing down from the vibrating sieve to each of the compartments at the upper part of the compartment. It is characterized by being arranged.

[0009]

DETAILED DESCRIPTION OF THE INVENTION According to the asphalt plant of the present invention, an aggregate having a particle size suitable for producing a desired special asphalt mixture is sieved between standard mesh screens arranged in a plurality of stages on a vibrating screen. A sieve for a special mixture having a mesh size that can be accommodated is inserted and arranged in advance.

When the asphalt mixture is produced, the aggregate is supplied to the vibrating sieve and finely sieved by a standard sieve and a special mixture sieve according to the particle size. By appropriately changing the flow path of the aggregate by the arranged flow path changing means, it is possible to store aggregate having a particle size suitable for production of a desired special asphalt mixture in the compartment under the flow of the aggregate. The desired special asphalt mixture can be obtained by paying out the sand to the mixer and adjusting the mixing with the molten asphalt and the like.

As described above, the special mixture sieve mesh is inserted at a predetermined position of the standard mesh, and the flow path of the sieved aggregate is appropriately changed by the aggregate flow path changing means. It is possible to obtain not only a particle size but also an aggregate having a special particle size, and it can cope with the production of a special asphalt mixture. In addition, if a plurality of sieve meshes for a special mixture to be inserted and prepared are prepared, the types of special asphalt mixtures that can be manufactured can be easily increased.

[0012]

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

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a plant main body of an asphalt plant, and a vibrating sieve 2 is mounted on the top of the main body. A heated aggregate heated and dried by a dryer (not shown) is supplied to the vibrating sieve 2 from an input port 3, and the aggregate generated is sieved by the vibration generated by the vibrator 4.

The vibrating sieve 2 is provided with several stages of sieve meshes, and the mesh size of the sieve mesh is the uppermost stage of the vibrating sieve 1 having a square (or round) sieve having a mesh size of 30 mm. A mesh 5a, a sieve mesh 5b having a mesh size of 16 mm in the lower stage, and a sieve mesh 6a for a special mixture having a mesh size of 12 mm in the lower stage, a sieve mesh 6b for a special mixture having a mesh size of 10 mm in the lower stage, and a lower stage thereof Is provided with a sieve mesh 6c for a special mixture having a mesh size of 7 mm, and a sieve mesh 5c having a standard mesh size of 6 mm is further arranged thereunder, and a sieve mesh 5d having a mesh size of 3 mm is arranged therebelow. By these sieve nets, oversize of 25 mm or more, 25 to 13 mm, 13 to 10 mm,
10-8mm, 8-6mm, 6-5mm, 5-2.5m
m, and is sieved into aggregate having a particle size of 2.5 mm or less.

The mesh size of these sieve meshes is a general one and is not particularly limited. The mesh size of the sieve mesh for a special mixture is an aggregate having a particle size suitable for a desired special asphalt mixture. Should be appropriately changed to a size that can be sieved. Further, in the examples, three sieves for the special mixture are arranged, but are not particularly limited,
If necessary, the number of screens may be increased or decreased to provide an arrangement suitable for producing a desired special asphalt mixture.

An aggregate storage bin 7 is disposed below the vibrating sieve 2, and the aggregate storage bin 7 partitions the inside of the bin appropriately to form compartments 7a, 7b, 7c, 7d, 7e. Vibrating sieve 2
The sand sieved and the aggregate of each particle size are stored in respective compartments. In addition, compartment 7
b, 7c, and 7d, a flow path changing damper 8a serving as a flow path changing means of an aggregate which is rotatably mounted at one end on the one end thereof,
8b, the flow path of the aggregate flowing down from the end of the vibrating sieve 2 can be changed.

Further, desired aggregates are sequentially dispensed to an aggregate measuring tank 9 below each of the compartments 7a, 7b, 7c, and 7d and are cumulatively weighed. Add asphalt, mix and adjust,
It is intended to produce the desired asphalt mixture.

When a special asphalt mixture, for example, a special asphalt mixture having an aggregate particle size of top size 10 mm, is manufactured, the flow path changing damper 8a is set to B
After rotating the flow path change damper 8b to the position of E at the position of, a predetermined aggregate, for example, quarry No. 6 (equivalent to a particle size of 13 to 5 mm) is supplied from an aggregate hopper (not shown). Aggregate) and sand are cut out, heated and dried by a dryer (not shown), lifted up to the top of the plant body 1 and put into the vibrating sieve 2 through the input chute 3.

The introduced aggregate is a standard sieve mesh 5a, 5b,
13c to 10mm, 10 to 8mm, 8 to 6mm, 6 to 5c, 5d and sieve screens 6a, 6b, 6c for special mixtures
Aggregates having a particle size of 5 mm and sand having a particle size of 2.5 mm or less are once finely sieved.

When the sieved aggregates having the respective particle sizes flow down to the compartments below the respective sieve nets, the flow passage changing dampers 8a and 8b are used to reduce the size to 10 to 8 mm and 8 to 6 m.
The aggregates having the respective particle diameters of m and 6 to 5 mm are collected again and stored in the compartment 7c as the aggregate having the particle diameter of 10 to 5 mm. In addition, in each of the compartments 7a and 7d, sand having a size of 2.5 mm or less and aggregate having a particle size of 13 to 10 mm are separately stored.
A predetermined amount of the aggregate having a particle size of 10 to 5 mm and sand is dispensed, and the mixture is adjusted by mixing with stone powder, molten asphalt, or the like by the mixer 10 so that the top size of the aggregate particle size is 1.
A special asphalt mixture having a specific gravity with a low noise function of 0 mm can be produced.

When manufacturing a special asphalt mixture having a specific gravity by a drainage function having an aggregate particle size of top size 13 mm and undersize 6 mm, the flow path change damper 8 a is set to the position A and the flow path change damper is set. If 8b is rotated to the position of D respectively, the crushed stone 6 (aggregate equivalent to 13 to 5 mm particle size) and sand are cut out from the aggregate hopper in the same manner as described above, and heated and dried. After sieving to each particle size in the same manner as above, the flow path changing damper 8
a, 8b guides each ward, and 1
Aggregate of 3-6 mm particle size is stored.

The aggregate and sand having a particle size of 13 to 6 mm are mixed and adjusted in the mixer 10 in the same manner as described above, so that the aggregate has a top size of 13 mm and an undersize of 6 m.
m, it is possible to produce a special asphalt mixture having a specific gravity due to its drainage function.

Further, when a standard asphalt mixture is manufactured, the flow path change damper 8a is rotated to the position A and the flow path change damper 8b is rotated to the position E, and then the aggregate hopper is moved. When the aggregate and sand as usual are cut out and heat-dried, are put into the vibrating sieve 2, the compartments 7a, 7b, 7 are changed by the flow path changing dampers 8a, 8b.
c, 7d and 7e each have a sand of 2.5 mm or less,
~ 2.5mm, 13-5mm, 25-13mm, 25m
The aggregate of each particle size of m or more is stored as usual, and a conventional standard asphalt mixture can be produced.

Thus, the standard mesh size sieve mesh 5
a, 5b, 5c, 5d, a sieve mesh 6a for the special mixture,
6b, 6c are inserted and arranged, and the aggregate is sieved finer according to the particle size, and the aggregate is separated into the compartments 7a, 7b,
Flow path change damper 8 when flowing down to 7c, 7d, 7e
By appropriately adjusting the positions of a and 8b, it is possible to easily obtain an aggregate having a different top size or undersize of the aggregate particle size from the standard, and to quickly respond to the production of a wide variety of special asphalt mixtures. Can be.

The sieve meshes 6a, 6b, 6c for special mixtures
If the size of the mesh is appropriately changed, an aggregate having a particle diameter different from the above can be obtained, and it can be used for production of any special asphalt mixture. In addition, if the number of the sieves for the special mixture is increased or decreased as necessary, it is possible to flexibly cope with the production of various kinds of special asphalt mixtures easily without replacing the sieves each time.

Further, the passage changing dampers 8a and 8b which are rotatable on the discharge side of the vibrating sieve 2 are arranged to change the passage of the aggregate, but the passage changing means is not limited to this. Instead, for example, an appropriate guide corresponding to the flow path change dampers 8a, 8b is provided on a discharge chute body connecting the discharge side of the vibrating screen 2 and the upper portions of the compartments 7b, 7c, 7d, 7e of the storage bin 7. It is also possible to prepare several types with the partitioning plate attached thereto, and change the flow path of the aggregate by changing the discharge chute as necessary.

[0027]

As described above, according to the asphalt plant of the present invention, a vibrating sieve for sieving aggregates heated and dried by a dryer by a sieve mesh arranged in a plurality of stages up and down, and a vibrating sieve Storage bins for storing aggregates sieved according to particle size in compartments, and an asphalt plant in which an aggregate weighing tank, a mixer, and the like are arranged below the aggregate storage bins, a plurality of standard meshes are arranged. A sieve mesh for a special mixture is inserted and arranged at a predetermined position between the sieve meshes, and a flow path changing means for changing a flow path of an aggregate flowing down from the vibrating sieve to each of the compartments is provided at the upper part of the compartment. Therefore, by operating the flow path changing means, it is possible to easily obtain an aggregate having a different top size or undersize of the aggregate particle size from the standard, and to quickly and easily produce a wide variety of special asphalt mixtures. Correspondence Rukoto can.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic front view of an embodiment of an asphalt plant according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plant main body 2 ... Vibrating sieve 5a, 5b, 5c, 5d ... Sieve mesh 6a, 6b, 6c ...
Sieve mesh for special mixture 7 ... Aggregate storage bottles 7a, 7b, 7c,
7d, 7e: Compartment chamber 8a, 8b: Channel change damper (channel change means) 9: Aggregate measuring tank 10: Mixer

Claims (1)

[Claims] 1. A vibrating sieve for sieving aggregates heated and dried by a dryer by a plurality of sieves arranged vertically, and a vibrating sieve stores the aggregates sieved by the vibrating sieve in a compartment according to particle size. In an asphalt plant in which an aggregate storage bin and an aggregate weighing tank, a mixer and the like are arranged below the aggregate storage bin, a sieve mesh for a special mixture is inserted at a predetermined position between sieve meshes arranged in a plurality of standard meshes. An asphalt plant, wherein a flow path changing means for changing a flow path of the aggregate flowing down from the vibrating sieve to each of the compartments is provided at an upper portion of the compartment.