JPH0523602Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to an aggregate particle size mixing device suitable for use in a continuous asphalt plant mixing device.

(Prior art) Conventionally, continuous asphalt plant mixing equipment produces various materials for the surface layer, middle layer, lower layer, etc. Fine sand, coarse sand, No. 7 crushed stone, Select several types of aggregates such as No. 6 crushed stone and No. 5 crushed stone from the aggregate silo or aggregate supply hopper, and set the feed rate of the selected aggregates to create a uniform mixture. was producing. At this time, the asphalt mixture was produced assuming that the aggregate silo or aggregate supply hopper contained aggregates classified by particle size without fail.

(Problems to be solved by the invention) However, in the current sand and crushed stone production factories, fine sand, coarse sand, No. 7 crushed stone, No. 6 crushed stone, No. It is shipped after being divided into granule sizes such as aggregates. There are many cases where different types of sand, crushed stone, large crushed stones, or other foreign substances are mixed into the granulated aggregate.

The present invention was developed in view of the current situation, and even if aggregate other than the specified particle size is mixed into the aggregate silo or aggregate hopper, or foreign matter is mixed in, it will be possible to reliably use aggregate of the specified particle size. It is an object of the present invention to provide an aggregate particle size mixing device for an asphalt plant that can produce a stable asphalt mixture because only the asphalt can be sent out through a vibrating sieve.

[Structure of the invention] (Means for solving the problem) The structure of the invention to achieve the above object is to feed several types of aggregate into several aggregate supply hoppers or aggregate silos, An aggregate belt feeder is provided in which the material falls onto a collection conveyor while maintaining a predetermined grain size, and aggregate of a predetermined grain size is provided between the collection conveyor and the aggregate belt feeder on the aggregate supply hopper or aggregate silo side. It is characterized by the provision of a vibrating sieve that supplies the aggregate onto the collecting conveyor and removes aggregates other than the specified ones to a vibrating discharge chute.

(Function) With the above configuration, aggregates with various grain sizes supplied from a plurality of aggregate supply hoppers through respective aggregate belt feeders are passed through a vibrating sieve, so that they are maintained at a predetermined grain size and aggregated. It falls onto a conveyor, where it can provide aggregate suitable for various composite materials such as for surface layer, middle layer, and lower layer.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

1 and 2, several (five in this example) aggregate supply hoppers 1 contain aggregates of fine sand, coarse sand, No. 7 crushed stone, No. 6 crushed stone, and No. 5 crushed stone (not shown). (omitted) are stored respectively. The lower opening of each supply hopper 1 receives and conveys the falling aggregate, and the aggregate is transferred to the collection conveyor 2.
An aggregate belt feeder 3 is provided for dropping onto the aggregate.

Three stages of vibrating screens and a vibrating discharge chute are arranged between the collecting conveyor 2 and the aggregate belt feeder 3. That is, the first vibrating sieve 4 is located at the top level and slopes downward, has the largest mesh size, and has the longest overall length, and the first vibrating screen 4 is located at the middle level, slopes downward, has medium coarseness, and has the longest overall length. A second vibrating sieve 5, which is in the middle, and a third vibrating discharge chute 6, which is located at the lowest stage, is inclined downward, and has the shortest overall length are disposed.

In the figure, 7 indicates an oversize discharge chute, 8 indicates an undersize discharge chute, and 9 indicates an oversize or undersize discharge port.

Therefore, the aggregate falling from the lower opening of the supply hopper 1 is conveyed by the aggregate belt feeder 3 and falls onto the first vibrating sieve 4. Since the first vibrating sieve 4 has the coarsest mesh, aggregates having a predetermined particle size and undersized aggregates fall onto the second vibrating sieve 5. That is, the oversized aggregate remains on the first vibrating sieve 4, falls along the slope of the first vibrating sieve 4, and is discharged from the oversized discharge chute 7.

On the other hand, for aggregates with a predetermined particle size and undersized aggregates that have fallen into the second vibrating sieve 5, since the mesh coarseness of the second vibrating sieve 5 is medium, the aggregate with a predetermined particle size remains on the second vibrating screen 5 and the undersized aggregate falls onto the third vibrating discharge chute 6. The aggregate remaining on the second vibrating sieve 5 having a predetermined particle size descends along the slope of the second vibrating sieve 5 and falls onto the collection conveyor 2.

Further, the undersized aggregate that has fallen onto the third vibration discharge chute 6 remains on the third vibration discharge chute 6 and is also removed from the third vibration discharge chute 6.
and is discharged from the undersize discharge chute 8.

In this way, by using three stages of vibrating screens and vibrating discharge chute, such as the first, second, and third vibrating screens and vibrating discharge chute, both oversized aggregate and undersized aggregate can be removed. ,
Only aggregates of a predetermined particle size are allowed to fall onto the collecting conveyor 2. In other words, when it is conveyed to the dryer in the next process and mixed with asphalt, aggregates suitable for the surface layer, middle layer, lower layer, etc. are supplied, so an asphalt mixture with stable quality can be obtained. It will be.

In some cases, it may be necessary to supply aggregate of a predetermined grain size and remove only oversized aggregate, or conversely, it may be necessary to supply aggregate of a predetermined grain size and remove only undersized aggregate. There are times when you want to do so.

In such a case, the three-stage vibrating sieve and vibrating discharge chute may be replaced with one or two stages. That is, by installing only the first vibrating sieve 4 and removing the second vibrating sieve 5, third vibrating discharge chute 6, and undersize discharge chute 8, aggregate of a predetermined particle size and undersize bones can be obtained. The material passes through the openings of the first vibrating sieve 4 and falls onto the collecting conveyor 2, where it is supplied to the next process. At this time, the oversized aggregate falls on the first vibrating sieve 4 along the slope and is discharged through the oversized discharge chute 7.

In addition, only the second vibrating sieve 5 is installed, the first vibrating sieve 4 and the oversize discharge chute 7 are removed, and the undersize discharge chute or the vibration discharge chute is installed over the entire area below the second vibrating sieve 5. , aggregates of a predetermined particle size and oversized aggregates descend over the second vibrating sieve 5 along its inclination and fall onto the collecting conveyor 2. At this time, the undersized aggregate is discharged through the above-mentioned undersized discharge chute.

[Effects of the invention] As described above, according to the invention, since the vibrating screen and the vibration discharge chute are disposed between the collecting conveyor and the aggregate belt feeder, the particle size of aggregate that is not suitable can be removed by the vibration discharge chute. The aggregates with the appropriate particle size are mixed with asphalt, and it is possible to obtain an asphalt mixture of stable quality for the surface layer, middle layer, lower layer, etc.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a front view and FIG. 2 being a side view. 1... Aggregate supply hopper and aggregate silo, 2...
... Collection conveyor, 3 ... Aggregate belt feeder, 4
...First vibrating sieve, 5... Second vibrating sieve, 6...
Third vibration discharge chute, 7... Oversize discharge chute, 8... Undersize discharge chute.

Claims (1)

[Scope of utility model registration request] An aggregate belt feeder 3 is provided in which several types of aggregates are fed into several aggregate supply hoppers 1 or aggregate silos, and the aggregates fall onto a collection conveyor 2 while maintaining a predetermined particle size. and the aggregate supply hopper 1 or the aggregate belt feeder 3 on the aggregate silo side.
Aggregate with a predetermined particle size is fed onto the collection conveyor 2 between the
1. An aggregate particle size mixing device for an asphalt plant, characterized in that vibrating screens 4, 5, and 6 are installed to remove aggregate particles.