JPH072648Y2 - Sieving and storage equipment for aggregates in asphalt plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a sieving storage device for an asphalt plant, which stores heat-dried aggregate by sieving according to particle size.

[Prior Art] In a conventional asphalt plant, as shown in FIG. 2, aggregate dried by heating in a dryer is sifted by a vibrating sieve 1 into an aggregate storage bin 2 having a section arranged below the vibrating sieve 1. It is temporarily stored for each grain size. Then, the discharge gates 3a, 3b, 3c, 3d arranged at the bottom of the aggregate storage bin 2 are opened according to the composition of the asphalt mixture to be produced, the desired aggregates are discharged, and the weighing hopper 4 performs cumulative measurement. It is put in the mixer 5, molten asphalt, stone powder, etc. are added and mixed and adjusted to produce an asphalt mixture.

By the way, in the asphalt plant, the aggregate is 25mm or more (oversize), 25-13mm, 13
It is common to sieve to 5 kinds of grain size of ~ 5mm, 5-2.5mm, 2.5mm or less, and in this case, the square hole (or round hole) of mesh size 30 on the top aggregate loading side. The sieve mesh 6a, the sieve mesh 6b having a mesh size of 15 mm are arranged in the lower stage, the sieve mesh 6c having a mesh size of 6 mm is arranged in the lower stage, and the sieve mesh 6d having a mesh size of 3 mm is arranged in the lower stage. When the aggregate is sieved by the vibrating sieve 1 having the sieve mesh arranged as described above, the sand bottle of the aggregate storage bin 2
In 2a, the one having a particle size of 2.5 mm or less that has passed through the lowermost screen 6d of the vibrating screen 1 is stored. Then, what is stored in this sand bottle 2a is used as a sand component in the production of the asphalt mixture.

In this way, since there is only one sand bottle in the aggregate storage bin of the conventional asphalt plant, it is supplied to the plant main unit despite being stocked separately from fine sand and coarse sand on the supply side. Fine sand and coarse sand are stored together in a sand bottle and are treated as aggregate of 2.5 mm or less.

[Problems to be solved by the invention] Therefore, when producing a special asphalt mixture, for example, a fine-gap gap asphalt mixture or an open-grain asphalt mixture, sand of a particle size corresponding to fine sand is required, so that the sand bottle is The stored sand and coarse sand are temporarily extracted and the fine sand is supplied and stored again in the sand bottle, or a separate bottle is prepared, which is very troublesome. Was there.

In view of the above points, the present invention makes it possible to screen the sand in the aggregate into two types, and divides the sand bottle into two chambers to separate the coarse and fine particles of sand separately. The purpose is to make it possible to cope with the production of high-quality, high-mixture asphalt mixture by making the structure capable of storing.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention stores a vibrating sieve that screens aggregate dried by heating with a dryer according to particle size, and an aggregate sieve screened by the vibrating screen according to particle size. In an aggregate sieving storage device in an asphalt plant consisting of aggregate storage bins provided with compartments, a guide chute that is inclined substantially parallel to the sieve mesh is arranged below the lowermost sieve mesh of the vibrating sieve, An auxiliary vibrating screen having a vibrating screen that is slanted in the opposite direction to the vibrating screen is disposed below the guide chute, and a partition wall that is orthogonal to the aggregate flow direction of the vibrating screen is installed inside the sand bin of the aggregate storage bin. An apparatus for sieving and storing aggregates in an asphalt plant, which is arranged so as to face a material discharge end of a screen of an auxiliary vibrating screen so as to divide the sand bottle into two chambers. .

[Operation] In the apparatus for sieving and storing aggregate in the asphalt plant according to the present invention, when the aggregate heated and dried by the dryer is put into the vibrating sieve, it is sieved one after another by the sieve mesh and stored according to the particle size. Will be done. Then, the fine-grained sand in the aggregate passes through the bottommost screen of the vibrating screen and falls onto the guide chute. The sand dropped on the guide chute slides down on the chute and falls from its tip onto the screen of the auxiliary vibrating screen, and the screen of the auxiliary vibrating screen is slanted in the opposite direction to the screen of the vibrating screen. It is sieved while flowing down, divided into fine-grained sand and coarse-grained sand, and stored in a sand bottle.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawing of FIG.

Reference numeral 11 is a vibrating sieve that sifts the heated aggregate fed from the feeding sheet 12 according to the particle size by the vibration generated by the vibrating body 13, and a sieve mesh of several stages is arranged inside thereof. The mesh size and arrangement of this screen are the same as those of the conventional ones.
At the position facing the charging chute 12 at the top of 11 is a sieve mesh 11a with a mesh size of 30 mm (or a round hole), followed by a sieve mesh 11b with a mesh size of 15 mm, and a mesh size of 6 at the bottom.
mm mesh screen 11c, and further below it with a mesh size of 3 mm
I have placed d. A guide chute 14 that closes the lower surface of the vibrating screen 11 by inclining it substantially parallel to the screen is disposed below the lowermost screen 11d of the vibrating screen 11 and passes through the lowermost screen. The sand slides down on the guide chute 14 and vibrates the sieve 11.
Reach the end of.

Below the vibrating screen 11, an auxiliary vibrating screen 16 having a vibrating body 15 is arranged. The auxiliary vibrating screen 16 is provided with a one-stage screen 16a inclined in the opposite direction to the screen of the vibrating screen 11 and has a finer mesh size of 1.5 mm than the lowermost screen 11d of the vibrating screen 11. It is arranged. This auxiliary vibrating screen 16 screens the sand that has passed through the lowermost stage of the vibrating screen 11, and aggregates that have passed through the mesh of the screen 16a pass through the screen of the screen 16a as fine sand particles of 1.18 mm or less. The missing aggregate is stored as 1.18-2.36 mm of coarse sand.

Below the vibrating screen 11 and the auxiliary vibrating screen 16, an aggregate storage bin 17 provided with compartments is arranged so that the sieved aggregate can be stored according to the particle size. Further, a partition wall 18 is disposed inside the sand bottle located below the auxiliary vibrating screen 16 at a position orthogonal to the aggregate flow direction of the vibrating screen 11 and facing the material discharge end of the screen 16a of the auxiliary vibrating screen 16. The sand bottle is divided into two chambers, a sand bottle 17a for storing coarse sand and a sand bottle 17b for storing fine sand.
And are formed. Aggregates with a larger grain size than the sand stored in the sand bottles 17a, 17b are sequentially stored in the aggregate bins 17c, 17d, 17e. 18a, 18b, 18c, 18d and 18e are discharge gates provided at the bottom of each bin.

A sand measuring hopper 19 dedicated to sand is arranged below the sand bottles 17a and 17b of the aggregate storage bin 17 so as to measure the amount of sand more precisely. An aggregate weighing hopper 20 similar to the conventional one is disposed below the aggregate bins 17c, 17d, 17e. 21 is a mixer for mixing materials.

Then, when the aggregate heated and dried by the dryer of the asphalt plant is lifted to the upper part of the mixing tower and charged into the vibrating screen 11 from the charging chute 12, the screens 11a to 1a-1
Sieved one after another by 1d. Fine-grained sand in the aggregate passes through the mesh of the sieve mesh one after another, and the mesh size at the bottom is 3 m.
It also reaches the guide chute 14 after passing through the m mesh screen 11d. The sand reaching the guide chute 14 slides down on the chute 14 and reaches the end of the vibrating screen 11. Then, the sand reaching the end of the vibrating screen 11 drops from the lower end of the guide chute 14 and transfers onto the screen 16a of the auxiliary vibrating screen 16, and the screen 16a is inclined in the opposite direction to the screen of the vibrating screen 11. The sand with a small particle size (1.18 mm or less) is passed through the mesh of the sieve mesh 16a and stored in the sand bottle 17b while the sand with a coarse particle size (1.18 to 2.36 mm) is It falls from the material discharge end of the sieve net 16a and is stored in the sand bottle 17a.

As described above, the sand that has passed through the mesh of the sieve net 11d is received by the guide chute 14, slide on the guide chute 14 and drop all the sand onto the upper end of the sieve net 16a of the auxiliary vibrating screen 16 to vibrate. It is made to flow down on the sieve net 16a of the auxiliary vibrating sieve 16 arranged in the opposite direction to the sieve net of the sieve 11 because it is difficult to sieve fine-grained sand, so the entire length of the sieve net 16a is effective. This is because it is used to efficiently screen the sand.

Then, when producing an asphalt mixture, a predetermined amount of coarse sand is dispensed from the sand bottle 17a according to the composition of the asphalt mixture, and a predetermined amount of fine sand is dispensed from the sand bottle 17b, and accumulated in the sand weighing hopper 19. Weigh. Further, a predetermined amount of aggregate is dispensed from the aggregate bins 17c, 17d, 17e, weighed by the aggregate weighing hopper 20 and dispensed to the mixer 21, and the asphalt is sprayed and mixed.

The auxiliary vibrating screen 16 is shown as a vibrating screen 11 provided separately from the vibrating screen 11, but a vibrating screen dedicated to sand is used to provide vibration suitable for screening fine sand. It is a separate unit for use and transportation.
The vibrating screen 11a is provided with a screen 16a under the guide chute 14 of
The auxiliary vibrating screen 16 may be integrated.

[Advantages of the Invention] In the aggregate sieving / storing device in the asphalt plant according to the present invention, the sand in the aggregate is sieved and stored into coarse-grained sand and fine-grained sand, and therefore the sand particle size control is performed. It is possible to quickly handle the production of a wide variety of asphalt mixtures, including the ability to rapidly produce dense-grained gap asphalt mixtures and open-grained asphalt mixtures that require fine-grained sand. it can. Further, the quality of the asphalt mixture can be improved by carefully controlling the grain size of the sand.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view in which a part of a sieving and storing apparatus for aggregate according to the present invention is longitudinally cut, and FIG. 2 is a schematic explanatory view in which a part of a conventional sieving and storing apparatus for aggregate is longitudinally cut. is there. 11 …… Vibration sieve, 12 …… Injection chute, 11a, 11b, 11c, 1
1d ...... sieve screen, 14 ... guide chute, 16 ... auxiliary vibrating screen,
16a ... sieve mesh, 17 ... aggregate storage bin, 17a, 17b ... sand bin, 17c, 17d, 17e ... aggregate bin, 18 ... bulkhead, 19 ...
Sand weighing hopper, 20 …… Aggregate weighing hopper, 21 …… Mixer

Claims (1)

[Scope of utility model registration request] 1. A bone in an asphalt plant, comprising: a vibrating sieve for sieving aggregate dried by drying with a dryer, and an aggregate storage bin provided with compartments for storing the aggregate sieved by the oscillating sieve according to grain size. In a material sieving storage device, a guide chute that is tilted substantially parallel to the screen is disposed below the lowermost screen of the vibrating screen, and the guide chute is tilted in the direction opposite to that of the vibrating screen below the guide chute. An auxiliary vibrating screen having a sieve screen is installed, and a partition wall, which is orthogonal to the aggregate flow direction of the vibrating screen, is placed inside the sand bin of the aggregate storage bin so as to face the material discharge end of the screen of the auxiliary vibrating screen. Set up 2 inside the sand bottle
An apparatus for sieving and storing aggregate in an asphalt plant, which is characterized in that it is divided into chambers.