JP3548609B2 - Asphalt plant - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an asphalt plant for producing an asphalt mixture as a road pavement material, and more particularly to an asphalt plant for producing a special asphalt mixture such as a drainage asphalt mixture.
[0002]
[Prior art]
Asphalt mixtures manufactured in asphalt plants are increasingly being manufactured specially according to their intended use, for example, to prevent rainwater or other water from collecting on the surface of paved roads, such as on highways. In addition, a drainable asphalt mixture has been produced that allows the water to penetrate the pavement while draining the water from the lower subgrade.
[0003]
As the aggregate used for the drainage asphalt mixture, two types of aggregates, that is, an aggregate having a particle size of 5 to 13 mm (80 to 85% by weight) and sand (15 to 20% by weight) are exclusively used. When producing a drainage asphalt mixture, a predetermined amount of crushed stone (aggregate equivalent to a particle size of 5 to 13 mm) and sand stored in a storage hopper are simultaneously dispensed and supplied to a dryer, and the bone heated by the dryer is supplied. The aggregate is supplied to the vibrating sieve of the plant body, sieved according to particle size, and stored in the aggregate storage bin.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned aggregate storage bin partitions the inside of the bin, and usually stores sand of 2.5 mm or less, aggregate of 2.5 to 5 mm, 5 to 13 mm, 13 mm to 20 mm, and aggregate of 20 mm or more according to particle size. Although it is divided into 5 compartments, as mentioned above, if only two types of aggregates of No. 6 crushed stone and sand are supplied, they are stored in compartments of 2.5 mm or less and 5-13 mm compartments in the aggregate storage bin. However, when trying to manufacture and ship asphalt mixture in these two bins, the storage capacity of the 5 to 13 mm compartment is too small to pay out aggregates, and it is necessary to wait for weighing. There are drawbacks such as causing
[0005]
No. 6 crushed stone (aggregate equivalent to 5 to 13 mm particle size) is supplied, but most of it is stored in a 5 to 13 mm compartment because it is passed through a vibrating screen and sieved. However, some smaller aggregates will be stored in 2.5-5 mm compartments and some larger aggregates will be stored in 13-20 mm compartments. . As described above, aggregates having uneven particle diameters are stored in the compartments of 2.5 to 5 mm and 13 to 20 mm. Therefore, when such aggregates are used without being removed at the next production of the ordinary asphalt mixture. It has problems that hinder product quality.
[0006]
In view of the above, the present invention has an aggregate storage bin structure that can increase the storage amount of a specific aggregate when manufacturing a special mixture using only a specific type of aggregate, and furthermore, in an unused compartment. It is an object of the present invention to provide an asphalt plant that is suitable for producing a special mixture that can be subjected to aggregate storage management, such as preventing aggregates having uneven particle sizes from being stored.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a vibrating sieve for sieving aggregates heated and dried by a dryer according to particle size, and an aggregate storage bin for storing aggregates sieved by the vibrating sieve in compartments according to particle size. In an asphalt plant in which an aggregate weighing tank, a mixer, and the like are arranged below the aggregate storage bin, a flow path change that changes the flow path of the aggregate flowing down from the vibrating sieve to each of the compartments at the top of the compartment. A damper is provided, and an opening / closing gate is provided at an inlet opening of an overflow chute provided above the compartment.
[0008]
In addition, an aggregate inlet for allowing the inflow of aggregate from an adjacent compartment is formed in a lower portion of the partition wall that partitions the compartment, and an opening and closing portion that controls opening and closing of the aggregate inlet is provided. It is characterized by having a lid.
[0009]
[Action]
According to the present invention, when producing an asphalt mixture using a specific type of aggregate such as a drainable asphalt mixture, after sieving by the operation of the flow path change damper disposed above the compartment of the aggregate storage bin. A specific type of aggregate can be stored in a specific compartment by appropriately changing the flow path of the aggregate. In addition, the entrance opening of the overflow chute of the compartment to be charged and stored is closed by the opening / closing gate so that the overflowing aggregate flows to the adjacent compartment side, and the same type of aggregate is stored in the two compartments. Its storage capacity can be increased.
[0010]
In addition, when the same type of aggregate is stored in the two compartments, if the opening and closing lid for the inflow of aggregate disposed at the lower part of the partition wall separating the specific compartment and the adjacent compartment is opened, the adjacent compartment is opened. The aggregate introduced into the room is discharged while flowing toward the specific compartment. Therefore, the aggregate stored in the two rooms can be dispensed by controlling the opening and closing of one gate, and the dispensing control becomes convenient.
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 is a mixing tower of an asphalt plant, on the top of which a vibrating screen 2 is mounted. A heated aggregate heated and dried by a dryer (not shown) is supplied to the vibrating sieve 2 from a charging chute 3, and the aggregate generated is sieved according to the particle size by the vibration generated by the vibrating body 4.
[0013]
Inside the vibrating sieve 2, several stages of sieve meshes are arranged. For example, at the position facing the uppermost stage feeding chute 3, a sieve mesh 5 a having a square hole (or round hole) with a mesh size of 25 mm, A sieve mesh 5b having a mesh size of 15 mm is arranged at the lower stage, a sieve mesh 5c having a mesh size of 6 mm is arranged at the lower stage, and a sieve mesh 5d having a mesh size of 3 mm is arranged at the lowermost stage.
[0014]
An aggregate storage bin 6 is disposed below the vibrating sieve 2, and the aggregate storage bin 6 appropriately partitions the inside of the bin to form compartments 6 a, 6 b, 6 c, 6 d, 6 e. Sand of 2.5 mm or less and aggregate of 2.5 to 5 mm, 5 to 13 mm, 13 to 20 mm, and 20 mm or more, which have been sieved, are stored in the respective compartments.
[0015]
Aggregate inlets 8 and 8 'are formed in the lower part of the partition wall 7 between the partition 6b and the partition 6c and the lower part of the partition wall 7' between the partition 6c and the partition 6d. Opening / closing lids 9 and 9 ′ that can be opened and closed from the compartments 6 c and 6 d are disposed at the aggregate inlets 8 and 8 ′ so that the compartments 6 b and 6 c can be opened and closed. Aggregate flows into the compartment 6d from the 6c side, so that the aggregate in the compartment 6b can be discharged from the compartment 6c and the aggregate in the compartment 6c can be discharged from the compartment 6d. I have to.
[0016]
At the upper part of the compartments 6b, 6c, 6d and 6e, rotatable passage changing dampers 10b and 10c, and 11c, 11c ', 11d and 11e, which are rotatably mounted at one end, are arranged, and a vibrating sieve is provided. The flow path of the aggregate flowing down from the end of the second can be changed.
[0017]
Each compartment is provided with overflow chutes 12a, 12b, 12c, 12d, and 12e for leading aggregates excessively supplied to the outside of the compartment. Opening and closing gates 12c 'and 12d' for controlling the discharge of the aggregate are attached to the inlet openings of the overflow chutes 12c and 12d.
[0018]
Further, aggregate gates 13a, 13b, 13c, 13d, and 13e for dispensing the aggregate are provided below the compartments 6a, 6b, 6c, 6d, and 6e, and the aggregate gates 13a, 13b, and 13c are provided. , 13d, and 13e, the desired aggregate is sequentially dispensed to the lower aggregate measuring tank 14 by accumulating and weighing the aggregate, and the measured aggregate is put into the mixer 15 and mixed with stone powder, asphalt and the like, and the mixture is adjusted. A desired asphalt mixture is manufactured.
[0019]
Next, the turning operation of the flow path change dampers 10b, 10c and 11c, 11c ', 11d, 11e and the opening / closing operation of the opening / closing lids 9, 9' of the aggregate inlets 8, 8 'of the partition wall 7 will be described.
[0020]
When manufacturing a normal asphalt mixture, as shown in FIG. 2, the opening / closing lids 9 and 9 'are fully closed to make each compartment independent, and the flow path change dampers 10b, 10c and 11c, 11c', 11d and 11e are rotated to positions where the aggregate sieved by the vibrating sieve 2 can be put into the corresponding compartments. This is indicated by the damper position number in FIG. 3, where the damper 10b is at the position (2), the damper 10c is at the position (3), the damper 11c is at the position (4), and the damper 11c 'is at the position (7). The damper 11d is turned to the position (5) and the damper 11e is turned to the position (9), and a predetermined aggregate and sand are stored in each compartment as before to produce an asphalt mixture.
[0021]
Next, the lids 9, 9 'and the flow path change dampers 10b, 10c and 11c, 11c', 11d, 11e for producing a special mixture mainly composed of No. 6 crushed stone or sand such as a drainage asphalt mixture. The position states of the open / close gates 12c 'and 12d' of the overflow chute will be described with reference to FIGS.
[0022]
First, a case will be described in which aggregate having a particle size of 5 to 13 mm corresponding to No. 6 crushed stone is stored in the compartments 6b and 6c to increase the storage amount.
[0023]
In this case, as shown in FIG. 4, the opening / closing gate 12c 'of the overflow chute provided in the compartment 6c is closed, and the opening / closing cover 9 provided on the partition wall 7 of the aggregate storage bin 6 is opened. Keep it. Further, the flow path changing damper 10b is at the position (1) in FIG. 3, 10c is at the position (3), 11c is at the position (4), 11c 'is at the position (7), and 11d is (4). At the position of ▼, 11e is rotated to the position of ８.
[0024]
By operating each gate and damper in this way, when the No. 6 crushed stone and sand are supplied to the vibrating sieve 2, the supplied aggregate is sieved by the vibrating sieve 2 and the particle size passed through the sieve mesh 5d. Is stored in the compartment 6a as sand.
[0025]
Since the aggregate having a particle size of 2.5 to 5 mm that does not pass through the sieve mesh 5c but does not pass through the sieve mesh 5d is not used for the drainage asphalt mixture produced this time, it is guided to the overflow chute 12b by the damper 10b to the outside. And discharge.
[0026]
The aggregate having a particle diameter of 5 to 13 mm flows into the compartment 6c first, and even when the compartment 6c is full, the opening / closing gate 12c 'of the overflow chute is closed, so that the aggregate does not overflow outside and passes over the compartment wall 7. And flows into the compartment 6b. Thus, the aggregate having a particle diameter of 5 to 13 mm is stored in the compartments 6b and 6c.
[0027]
When the aggregate is paid out from the aggregate gate 13c of the compartment 6c and used, the aggregate having a particle diameter of 5 to 13 mm stored in the compartment 6b can flow into the compartment 6c through the aggregate inflow port 8. It is possible to operate with an increased storage of aggregates of 粒径 13 mm particle size.
[0028]
FIG. 5 shows an example in which the size of the crushed stone of No. 6 is sufficiently controlled, and the oversized aggregate exceeding 5 to 13 mm in diameter that does not pass through the sieve mesh 5b is used as the crushed stone of No. 6. In FIG. 4, 11c and 11d of the flow path change dampers are rotated to the position of {circle around (5)} in FIG. 3 to move the oversized aggregate toward the compartments 6b and 6c. We can make it available.
[0029]
Further, a case will be described in which aggregate having a particle size of 5 to 13 mm corresponding to No. 6 crushed stone is stored in the compartments 6c and 6d to increase the storage amount.
[0030]
In this case, as shown in FIG. 6, the opening / closing gate 12c 'of the overflow chute provided in the compartment 6c is opened, and the opening / closing gate 12d' of the overflow chute provided in the compartment 6d is closed. Then, the open / close lid 9 provided on the partition wall 7 of the aggregate storage bin 6 is closed, and the open / close lid 9 'provided on the partition wall 7' is opened. Further, both the flow path change dampers 10b and 10c are located at the position (2) in FIG. 3, 11c and 11d are both located at the position (4), 11c 'is located at the position (6), and 11e is located at the position (8) in FIG. Rotating operation.
[0031]
By operating each gate and damper in this way, the aggregate having a particle diameter of 5 to 13 mm flows into the compartment 6d first, and even if the compartment 6d is full, the opening / closing gate 12d 'of the overflow chute is closed. As a result, it does not overflow to the outside and flows into the compartment 6c beyond the partition wall 7 '. Thus, the aggregate having a particle diameter of 5 to 13 mm is stored in the compartments 6c and 6d.
[0032]
When the aggregate is paid out from the aggregate gate 13d of the compartment 6d and used, the aggregate having a particle diameter of 5 to 13 mm stored in the compartment 6c can flow into the compartment 6d through the aggregate inlet 8 '. It can be operated with an increased storage of aggregates of 5-13 mm particle size.
[0033]
FIGS. 7 and 8 show another example of use in the case where aggregate having a particle size of 5 to 13 mm is stored and used in the compartment 6c and the compartment 6d.
FIG. 7 shows a state in which the flow path change damper 11d is rotated to the position (5) in FIG. 3 with respect to FIG. In this example, an oversized aggregate exceeding the diameter is used as the crushed stone No. 6, so that the oversized aggregate is also charged into the compartments 6d and 6c.
[0034]
Further, in FIG. 8, the flow path change damper 11e is rotated to the position of {circle over (9)} in FIG. 6 with respect to FIG. This shows an example in which the No. 5 crushed stone is charged into the compartment 6e for use in adjusting the particle size.
[0035]
As described above, by operating the flow path change dampers 10b, 10c, and 11c, 11c ', 11d, and 11e provided at the upper part of the compartment and the opening / closing gates 12c' and 12d 'of the overflow chute, the adjacent compartments are operated. The same kind of aggregate can be stored, and the storage amount can be increased.
[0036]
Further, by changing the flow path of the aggregate by rotating the flow path change dampers 10b, 10c, and 11c, 11c ', 11d, 11e, 10d, and 10e, the desired aggregate can be put into the desired compartment. Further, unnecessary aggregates can be discharged to the outside according to the state of controlling the particle size of the aggregates, so that the aggregates can be easily stored and managed, and a plant suitable for manufacturing a special mixture can be provided.
[0037]
Furthermore, if the opening / closing lids 9 and 9 'for closing the aggregate inflow ports 8 and 8' formed in the partition walls 7 and 7 'between the compartments are opened, the aggregate stored in the two compartments is reduced. Dispensing can be performed from one aggregate gate, and dispensing control is convenient.
[0038]
【The invention's effect】
As described above, in the asphalt plant according to the present invention, the vibration sieve 2 is moved from the vibrating sieve 2 to each compartment by rotating the flow path change dampers 10b, 10c and 11c, 11c ', 11d, and 11e disposed in the upper portion of the compartment. The opening and closing gates 12c 'and 12d' are arranged at the entrance opening of the overflow chute arranged at the upper part of the compartment so that the flow path of the aggregate to be sieved and charged can be changed. The same type of aggregate can be stored in the compartment, and a plant suitable for producing a special mixture can be provided.
[0039]
In addition, opening / closing lids 9 for perforating the aggregate inflow ports 8 and 8 ′ for allowing the inflow of aggregate between the compartments adjacent to the compartment walls 7 and 7 ′ of the compartment, and closing the aggregate inflow port, By opening 9 ', the aggregate stored in the two chambers is discharged while flowing into one compartment, so that the aggregate stored in the two chambers is paid out by controlling the opening and closing of one gate. Payout control becomes convenient.
[Brief description of the drawings]
FIG. 1 is a partially cut-away schematic front view of an embodiment of an asphalt plant of the present invention.
FIG. 2 is a view showing a state of a damper position at the time of producing a normal mixture according to the first embodiment.
FIG. 3 is a diagram illustrating a damper position state according to the embodiment.
FIG. 4 is a view showing a damper position state when the compartments 6b and 6c are used for No. 6 crushed stone at the time of producing the special mixture.
FIG. 5 is a view showing another damper position state when the compartments 6b and 6c are used for No. 6 crushed stone at the time of producing the special mixture.
FIG. 6 is a view showing a damper position state when the compartments 6c and 6d are used for No. 6 crushed stone at the time of producing the special mixture.
FIG. 7 is a view showing another damper position state when the compartments 6c and 6d are used for No. 6 crushed stone at the time of producing the special mixture.
FIG. 8 is a diagram showing another damper position state when the compartments 6c and 6d are used for No. 6 crushed stone during the production of the special mixture.
[Explanation of symbols]
2: Vibrating sieve 6: Aggregate storage bins 6a, 6b, 6c, 6d, 6e: Compartment chamber 7, 7 '... Compartment wall 8, 8' ... Aggregate inlet 9, 9 '... Opening / closing lid 10b, 10c ... Flow Road change dampers 11c, 11c ', 11d, 11e ... flow change dampers 12a, 12b, 12c, 12d, 12e ... overflow chutes 12c', 12d '... opening and closing gates

Claims (2)

A vibrating sieve for sieving aggregates heated and dried by a dryer according to particle size, an aggregate storage bin for storing aggregates sieved by the vibrating sieve in a compartment according to particle size, and an aggregate weighing below the aggregate storage bins In an asphalt plant in which a tank, a mixer, and the like are arranged, a flow path change damper that changes a flow path of aggregate flowing down from the vibrating sieve to each of the compartments is provided at an upper portion of the compartment, and an upper portion of the compartment is provided. An asphalt plant, characterized in that an opening / closing gate is provided at an inlet opening of an overflow chute provided in the plant. At the lower part of the partition wall that partitions the compartment, an aggregate inlet that allows the inflow of aggregate from the adjacent compartment is formed, and an opening / closing lid that controls opening and closing of the opening is provided at the aggregate inlet. The asphalt plant according to claim 1, wherein the asphalt plant is provided.

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