JP4871227B2 - Asphalt feeder - Google Patents

Description

  The present invention relates to an asphalt supply apparatus for supplying asphalt when producing an asphalt mixture.

An asphalt mixture that is a road paving material is manufactured by measuring asphalt, aggregate, stone powder, and the like based on a blending design in an asphalt plant and then kneading the mixture with a mixer or the like.
FIG. 5 is a schematic view showing an asphalt mixture manufacturing apparatus according to a conventional asphalt plant. A conventional asphalt mixture manufacturing apparatus 120 is provided with a plurality of asphalt tanks 101 to 103, an aggregate tank 121 and a stone powder tank 122, and further an asphalt measurement tank 104 and an aggregate measurement tank for measuring each material. 123, a stone powder measuring tank 124 is provided. The asphalt measuring tank 104, the aggregate measuring tank 123, and the stone powder measuring tank 124 are connected to the mixer 125 via a pipe (not shown). The mixer 125 is provided with an additive tank 126 in which an additive is stored via a flow meter 127 in order to mix the additive and the like into the asphalt mixture.

  The asphalt mixture is manufactured by kneading each measured material with the mixer 125 in the asphalt mixture manufacturing apparatus 120 having such a configuration. In recent years, asphalt mixture needs are diversified from the viewpoint of environmental problems and high functionality, so that different types of asphalt are stored in asphalt tanks 101 to 103, and these different types of asphalt are used to meet the needs. It is practiced to produce asphalt mixtures.

Here, the asphalt supply apparatus 130 according to the asphalt mixture manufacturing apparatus 120 will be described in detail.
The asphalt supply device 130 includes, for example, asphalt tanks 101 to 103 in which three types of asphalt P, asphalt Q, and asphalt R are stored; Asphalt supply pipe 131, a pump 132 capable of forward / reverse operation installed in a part of the asphalt supply pipe 131, an asphalt return pipe 133 for circulating each asphalt, and a plurality of direction switching installed in the branch of each pipe And a valve 134. The asphalt supply pipe 131 includes a main pipe 131 a having one end connected to the asphalt measuring tank 104, and a plurality of sub pipes 131 b that connect the main pipe 131 a and the asphalt tanks 101 to 103.

For example, when asphalt P is supplied to the asphalt metering tank 104, the direction switching valve 134 is appropriately switched, and then the pump 132 is normally operated to supply the asphalt P in the asphalt tank 101 to the asphalt metering tank 104.
When metering the asphalt P, for example, the direction switching valve 134 closest to the asphalt metering tank 104 is switched to allow the asphalt P to flow into the asphalt return pipe 133 so that the asphalt P is circulated. Good.

Here, when the asphalt Q is continuously supplied after the asphalt P is supplied, first, the pump 132 is reversely rotated to collect the asphalt P remaining in the asphalt supply pipe 131 in the asphalt tank 101. . If the asphalt P remains in the asphalt return pipe 133, the direction switching valve 134 is switched and the pump 132 is rotated in the reverse direction to collect the asphalt P in the asphalt tank 101.
Then, when the asphalt P is no longer in the asphalt supply pipe 131, the direction switching valve 134 is switched to supply the asphalt Q from the asphalt tank 102. Thereby, since the asphalt P remaining in the asphalt supply pipe 131 and the asphalt Q to be weighed are not mixed, accurate weighing can be performed.

Japanese Patent Laying-Open No. 2004-225251 (FIG. 1)

  As described above, according to the asphalt supply device 130, when continuously supplying different types of asphalt, the asphalt remaining in the asphalt supply pipe 131 is recovered in the original asphalt tank each time, The desired asphalt had to be supplied. For this reason, the work is complicated and the time cost is increased.

  Further, for example, when a new pipe is installed in an existing asphalt tank, the asphalt stored in the existing asphalt tank has to be once discharged to the outside, and the installation work is complicated.

The present invention has been made to solve such a problem, and is capable of performing work efficiently when continuously measuring a plurality of types of asphalt in an asphalt measuring tank, and is an existing asphalt supply device. However, it is an object to provide an asphalt supply device that can be easily installed.

  In order to solve such problems, the present invention provides a plurality of asphalt tanks for storing asphalt, an asphalt measuring tank for measuring the asphalt, a first main pipe connected to the asphalt measuring tank, A first asphalt supply pipe having a plurality of first sub pipes connecting the asphalt tank and the first main pipe, a pump installed in the first main pipe and capable of forward / reverse operation, and the first A direction switching valve installed in each branch of the asphalt supply pipe, and an asphalt supply device having a second main pipe connected to the asphalt measuring tank, the individual first sub pipes and the second main pipes. A second asphalt supply pipe provided with a plurality of second sub-pipings, a pump installed in the second main pipe and capable of forward / reverse operation, and the second asphalt supply It characterized by having a a direction switching valve installed in each branch.

According to this configuration, immediately after one asphalt is supplied using the first asphalt supply pipe, another asphalt can be supplied by the second asphalt supply pipe, so that the one remaining in the first asphalt supply pipe. Asphalt can be continuously weighed without waiting for the recovery work. Thereby, the work time concerning supply of asphalt can be shortened.
In addition, since the second asphalt supply pipe is connected to the first auxiliary pipe, for example, when installed in an existing asphalt supply device, the asphalt stored in the asphalt tank can be easily discharged without being discharged to the outside. Can be installed.

  In the present invention, the asphalt measuring tank may be provided with a stirrer. According to such a configuration, different types of asphalt can be agitated at the stage before kneading with aggregate, stone powder, etc., so that the unevenness of different types of asphalt can be eliminated and the quality of the asphalt mixture can be improved.

  Further, the present invention includes an additive tank including an additive mixed in the asphalt, and the asphalt measuring tank and the additive tank may be connected via an additive pipe including a flow meter. Good.

For example, as described above, when an additive is mixed during kneading with a mixer, the additive is biased, the effect of the additive is not sufficiently exhibited, and the quality of the product may be lowered. In other words, since the aggregate that is much larger in volume and weight than the additive is fed into the mixer, the additive may not be uniformly dispersed.
However, according to the configuration of the present invention, the molten asphalt and the additive can be uniformly kneaded, so that the quality of the product can be improved.
Additives include regenerative additives that restore the properties of reclaimed asphalt, modifiers that improve fluid resistance, anti-peeling agents that suppress delamination of asphalt and aggregates, and warming agents for the purpose of warming. Say.

  The present invention may also include a second asphalt return pipe that connects the asphalt tank with a position of the second asphalt supply pipe that is close to the asphalt metering tank.

  According to this configuration, since the asphalt can be circulated by the second asphalt return pipe, it is possible to prevent the asphalt remaining in the second asphalt supply pipe from being hardened when the asphalt is being measured.

  According to the asphalt supply apparatus according to the present invention, it is possible to efficiently perform work when measuring multiple types of asphalt continuously in an asphalt measuring tank, and also easily to an existing asphalt supply apparatus. Can be installed.

The best embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing an asphalt supply apparatus in the present embodiment. FIG. 2 is a schematic view showing a first unit of the asphalt supply apparatus in the present embodiment. FIG. 3 is a schematic view showing a second unit of the asphalt supply device in the present embodiment. FIG. 4 is an overall schematic view showing the asphalt supply apparatus in the present embodiment. In addition, the arrow in a figure shows the flow direction of asphalt, and let the asphalt tank side be upstream and the asphalt measurement tank side be downstream.

  Asphalt supply apparatus 1 according to the present embodiment, as shown in FIG. 1, a plurality of asphalt tanks A1 to A3, an asphalt measuring tank 2 for measuring asphalt, and each asphalt tank and asphalt measuring tank 2 are connected to each other. One asphalt supply pipe 10 and a first asphalt return pipe 20 for circulating the asphalt are provided. Moreover, the asphalt supply apparatus 1 has the 2nd asphalt supply pipe 30 which connects a part of 1st asphalt supply pipe | tube 10 and the asphalt measurement tank 2, and the 2nd asphalt return pipe 40 for circulating asphalt. Direction switching valves H1 to H16 are installed at the branches of the pipes.

  Furthermore, the asphalt supply apparatus 1 includes an additive tank B that stores the additive S to be added to the asphalt, and an additive pipe 50 that connects the additive tank B and the asphalt measuring tank 2. In addition, pumps N1 to N3 are respectively installed in part of the first asphalt supply pipe 10, the second asphalt supply pipe 30, and the additive pipe 50.

  Here, the configuration of the pipe including the first asphalt supply pipe 10 and the second asphalt return pipe 20 is also referred to as a first unit X hereinafter. The configuration of the piping provided with the second asphalt supply pipe 30 and the second asphalt return pipe 40 is also referred to as a second unit Y hereinafter.

  A mixer (not shown) is disposed below the asphalt measuring tank 2, and aggregates supplied from an aggregate measuring tank (not shown) and stone powder and asphalt supplied from a stone powder measuring tank are kneaded by the mixer. As a result, an asphalt mixture is produced (see FIG. 5).

Asphalt tanks A1 to A3, as shown in FIG. 1, are composed of three tanks in the present embodiment, and store different types of liquid asphalt. Asphalt tanks A1 to A3 are tanks having a storage amount of about 20 t, for example. Examples of stored asphalt include straight asphalt 40-60, straight asphalt 60-80, polymer-modified asphalt II type, polymer-modified asphalt H type, semi-blown asphalt (AC100), asphalt for recycled materials, and other polymers. Examples include modified asphalt. By appropriately blending these different types of asphalts, it is possible to produce asphalt mixtures that meet various needs.
In the present embodiment, it is assumed that asphalt P is stored in the asphalt tank A1, asphalt Q is stored in the asphalt tank A2, and asphalt R is stored in the asphalt tank A3.

  The asphalt measuring tank 2 measures asphalt and supplies appropriately measured asphalt to a mixer (not shown). The asphalt measuring tank 2 according to the present embodiment uses a known asphalt measuring tank. In addition, in the asphalt measuring tank 2 which concerns on this embodiment, the stirrer F is provided in the inside of the asphalt measuring tank 2. FIG.

Here, the first unit X will be described with reference to FIG.
The first asphalt supply pipe 10 is a pipe that connects the asphalt tanks A <b> 1 to A <b> 3 and the asphalt measuring tank 2 to supply each stored asphalt to the asphalt measuring tank 2. The first asphalt supply pipe 10 includes a first main pipe 11 connected to the asphalt measuring tank 2 and a first sub pipe 12 that connects each of the asphalt tanks A <b> 1 to A <b> 3 and the first main pipe 11. The first auxiliary pipe 12 is connected to the asphalt tanks A1 to A3. For example, the first auxiliary pipe 12a for A1 connects the asphalt tank A1 and the first main pipe 11. The A2 first sub pipe 12b connects the asphalt tank A2 and the first main pipe 11. The A3 first sub pipe 12c connects the asphalt tank A3 and the first main pipe 11.

  A direction switching valve H1 is installed at a branch between the first main pipe 11 and the A2 first sub pipe 12b. In addition, a direction switching valve H2 is installed at a branch between the first main pipe 11 and the A3 first sub pipe 12c. In this embodiment, the direction switching valve H is a three-way valve and is connected to a control device (not shown). The direction of the three-way valve is appropriately switched by the operation of the control device.

  The first asphalt return pipe 20 is a pipe for connecting the first main pipe 11 and the asphalt tanks A1 to A3 to circulate the asphalt. The first asphalt return pipe 20 is a first return main pipe 21 connected to a position downstream of the first pump N1 and close to the asphalt measuring tank 2 in the first main pipe 11, and a first return. It has the 1st return subpipe 22 which connects main pipe 21 and asphalt tanks A1-A3, respectively. The first return sub-pipe 22 is connected to each of the asphalt tanks A1 to A3. For example, the first return sub-pipe 22a for A1 connects the asphalt tank A1 and the first return main pipe 21. The first return sub-pipe 22b for A2 connects the asphalt tank A2 and the first return main pipe 21. The first return sub-pipe 22c for A3 connects the asphalt tank A3 and the first return main pipe 21.

  At the branch between the first main pipe 11 and the first return main pipe 21, a direction switching valve H3 is installed. In addition, a direction switching valve H4 is installed at the branch of the first return main pipe 21 and the A2 first return sub pipe 22a. In addition, a direction switching valve H5 is installed at a branch between the first return main pipe 21 and the A3 first return sub pipe 22c.

  The first pump N1 is a power source that causes the asphalt in the asphalt tanks A1 to A3 to flow into the asphalt metering tank 2, and a pump capable of forward / reverse operation is used in this embodiment. The first pump N1 is installed in the first main pipe 11 between the direction switching valve H2 and the direction switching valve H3.

Next, the second unit Y will be described with reference to FIG.
The second asphalt supply pipe 30 is a pipe that connects the first sub pipe 12 and the asphalt measuring tank 2 and supplies each asphalt to the asphalt measuring tank 2. The second asphalt supply pipe 30 includes a second main pipe 31 connected to the asphalt measuring tank 2 and a second sub pipe 32 that connects each first sub pipe 12 and the second main pipe 31. The second sub pipe 32 is connected to each of the first sub pipes 12a to 12c. For example, the A1 second sub pipe 32a connects the A1 first sub pipe 12a and the second main pipe 31 to each other. The A2 second auxiliary pipe 32b connects the A2 first auxiliary pipe 12b and the second main pipe 31 together. The A3 second auxiliary pipe 32c connects the A3 first auxiliary pipe 12c and the second main pipe 31 together.

A direction switching valve H6 is installed at a branch between the A1 first sub pipe 12a and the A1 second sub pipe 32a. In addition, a direction switching valve H7 is installed at a branch between the A2 first sub pipe 12b and the A2 second sub pipe 32b. In addition, a direction switching valve H8 is installed at a branch between the A3 first sub pipe 12c and the A3 second sub pipe 32c.
In addition, a direction switching valve H9 is installed at a branch between the second main pipe 31 and the A2 second sub pipe 32b. In addition, a direction switching valve H10 is installed at a branch between the second main pipe 31 and the A3 second sub pipe 32c.

  The second asphalt return pipe 40 is a pipe for connecting the second main pipe 31 and each first return sub pipe 22 to circulate the asphalt. The second asphalt return pipe 40 is a second return main pipe 41 connected to a position downstream of the second pump N2 and close to the asphalt measuring tank 2 in the second main pipe 31, and each first A second return sub-pipe 42 that connects the return sub-pipe 22 and the second return main pipe 41 is provided. The second return sub-pipe 42 is connected to each of the first return sub-pipes 22a to 22c. For example, the second return sub-pipe 42a for A1 includes the first return sub-pipe 22a for A1 and the second return main pipe 41. And The second return sub-pipe 42b for A2 connects the first return sub-pipe 22b for A2 and the second return main pipe 41. The second return sub-pipe 42c for A3 connects the first return sub-pipe 22c for A3 and the second return main pipe 41.

  A direction switching valve H11 is installed at a branch between the second return main pipe 41 and the A2 second return sub pipe 42b. In addition, a direction switching valve H12 is installed at a branch between the second return main pipe 41 and the A3 second return sub pipe 42c. In addition, a direction switching valve H13 is installed at a branch between the second main pipe 31 and the second return main pipe 41.

  In addition, a direction switching valve H14 is installed at the branch between the first return sub-pipe 22a for A1 and the second return sub-pipe 42a for A2. A direction switching valve H15 is installed at the branch between the A2 first return sub-pipe 22b and the A2 second return sub-pipe 42b. In addition, a direction switching valve H16 is installed at a branch between the A3 first return sub-pipe 22c and the A3 second return sub-pipe 42c.

  The second pump N2 is a power source that causes the asphalt in the asphalt tanks A1 to A3 to flow into the asphalt metering tank 2, and a pump capable of forward / reverse operation is used in this embodiment. The second pump N2 is installed between the direction switching valves H10 and H13 in the second main pipe 31.

As shown in FIG. 1, the additive tank B is a tank that stores the additive S that is mixed when the asphalt mixture is manufactured. Examples of the additive S include, for example, a regenerative additive that restores the properties of regenerated asphalt, a modifier that improves flow resistance, a delamination inhibitor that suppresses delamination of asphalt and aggregate, and a warming agent for the purpose of warming. Etc.
The additive tank B and the asphalt measuring tank 2 are connected via an additive pipe 50. The additive pipe 50 is provided with a flow meter T that measures the flow rate of the additive S and a third pump N3 that is a power source that causes the additive S to flow.
In addition, the configuration including the additive tank B, the additive pipe 50, the flow meter T, and the third pump N3 is hereinafter also referred to as an additive unit Z.

Next, the operation of the asphalt supply device 1 according to the present embodiment will be described.
First, the operation when weighing the asphalt P stored in the asphalt tank A1 will be described with reference to FIG.

<Weighing only asphalt P>
An operator operates the direction switching valves H1, H2, H3, and H6 by a control device (not shown) to connect the first main pipe 11 and the A1 first sub pipe 12a. Then, asphalt P is caused to flow into the asphalt metering tank 2 by causing the first pump N1 to operate normally. When a predetermined amount is introduced, measurement is performed in the asphalt measuring tank 2. At this time, it is preferable to stir the asphalt P by operating the stirrer F provided in the asphalt measuring tank 2.

  When the measurement of the asphalt P is completed and the asphalt P remaining in the first asphalt supply pipe 10 is recovered, the first pump N1 is reversely operated. Thereby, the asphalt P remaining in the first main pipe 11 and the first auxiliary pipe 12a for A1 can be collected in the asphalt tank A1.

Here, when the supply of asphalt P is once stopped and then supplied again, the asphalt P is prevented so that the asphalt P remaining in the first main pipe 11 and the first auxiliary pipe 12a for A1 does not harden. Is preferably circulated.
That is, as shown in FIG. 2, the direction switching valve H3 is operated to connect the first main pipe 11 and the first return main pipe 21. Further, the direction switching valves H4, H5, and H14 are operated to connect the first asphalt return pipe 21. Then, by operating the first pump N1, the asphalt P remaining in the first main pipe 11 and the like circulates, so that the asphalt P can be prevented from hardening.

In the case of circulating asphalt P using the first asphalt return pipe 20,
When collecting the asphalt P, the asphalt P remaining in the first asphalt supply pipe 10 and the first asphalt return pipe 20 can be collected in the asphalt tank A1 by rotating the first pump N1 in the reverse direction.

  As shown in FIG. 1, the additive S can be mixed into the asphalt P by operating the third pump N3 related to the additive unit Z. Since the flowmeter T is installed in the additive pipe 50, a desired amount of the additive S can be mixed.

<Weighing asphalt Q continuously after weighing asphalt P>
Next, immediately after the asphalt P is measured, the operation when the asphalt Q is continuously measured will be described with reference to FIG.
As described above, after the supply of asphalt P is temporarily stopped, a control device (not shown) is operated to supply asphalt Q stored in the asphalt tank A2 to the asphalt metering tank 2. That is, the A2 second auxiliary pipe 32b and the second main pipe 31 are communicated with each other by the direction switching valves H7, H9, H10, and H13 by the control device. Then, the asphalt Q is supplied to the asphalt measuring tank 2 by operating the second pump N2 in the normal direction.

  When the measurement of the asphalt Q is completed and the asphalt Q remaining in the second asphalt supply pipe 10 is recovered, the second pump N2 is reversely operated. Thereby, the asphalt Q remaining in the second main pipe 31 and the second auxiliary pipe 32b for A2 can be recovered in the asphalt tank A2.

Here, after the supply of asphalt Q is once stopped, when asphalt Q is continuously measured, the asphalt Q is prevented from hardening in the second main pipe 31 and the second sub pipe 32b for A2. It is preferable to circulate Q.
That is, as shown in FIG. 4, the direction switching valve H13 is operated to connect the second main pipe 31 and the second return main pipe 41. Furthermore, the direction switching valves H11, H12, and H15 are operated to connect the second asphalt return pipe 40. Then, by operating the second pump N2, asphalt Q remaining in the second main pipe 31 and the A2 second sub pipe 32b circulates, so that the asphalt P can be prevented from hardening.

  In the case where the asphalt Q is circulated using the second asphalt return pipe 40, when the asphalt Q is recovered, the second pump N2 is reversely rotated to reversely rotate the second return main pipe 31 and the second for A2. Asphalt Q remaining in the return sub-pipe 42b and the like can be collected in the asphalt tank A2.

<Measurement of asphalt R continuously after measuring asphalt P and asphalt Q>
A case where the asphalt R is continuously weighed after the asphalt Q is weighed will be described. The asphalt distribution direction is not specifically shown, but will be described with reference to FIG.
First, as a previous step, asphalt Q is supplied as described above, all asphalt P remaining in the first unit X is collected in the asphalt tank A1.
Then, after the supply of asphalt Q is temporarily stopped as described above, the control device is operated to supply asphalt R stored in the asphalt tank A3 to the asphalt measuring tank 2. That is, the control device causes the first auxiliary pipe 12c for A3 and the first main pipe 11 to communicate with each other by the direction switching valves H2, H3, and H8. Then, the asphalt R is supplied to the asphalt metering tank 2 by causing the first pump N1 to operate normally.
The method for collecting the asphalt R and the method for circulating the asphalt R are substantially the same as the other return pipes, and thus the description thereof is omitted.

  According to the asphalt supply apparatus 1 as described above, asphalt Q can be continuously supplied after asphalt P is supplied. That is, as shown in FIG. 5, according to the conventional asphalt supply device 130, since there is only one asphalt supply system, when asphalt Q is continuously supplied after asphalt P is supplied, the asphalt supply pipe After asphalt P remaining in 131 was recovered, asphalt Q had to be supplied. According to such a configuration, since it is necessary to wait for the recovery of the remaining asphalt, the time cost is increased. In addition, when there are many types of asphalt to be kneaded, the supply operation and the recovery operation must be performed one by one, which is complicated.

  However, according to the present embodiment, since the second unit Y is provided in addition to the first unit X, the asphalt Q is continuously supplied after the asphalt P is supplied without waiting for the asphalt P to be collected. can do. In addition, asphalt P remaining in the piping of the first unit X can be removed while the asphalt Q is being supplied by the second unit Y, immediately after the asphalt Q is supplied, the asphalt R is continuously removed. Can be supplied. That is, according to such a configuration, different types of asphalt can be continuously supplied without waiting for the time for collecting the asphalt, so that work efficiency can be improved. Moreover, since two units are provided, different types of asphalt are not mixed, and measurement can be performed with high accuracy.

Moreover, since the additive unit Z is installed in the asphalt measuring tank 2, the measured asphalt and the additive S can be kneaded. That is, as shown in FIG. 5, according to the conventional asphalt mixture manufacturing apparatus 120, the additive S and the aggregate having a volume larger than that of the additive S are mixed into the mixer 125 at the same time. There was a consideration that it would not be dispersed.
However, according to this embodiment, the additive S can be mixed with liquid asphalt in the asphalt measuring tank 2. Thereby, since the bias | inclination of the additive S can be prevented, a high quality asphalt mixture can be manufactured. Moreover, in this embodiment, since the stirrer F is installed in the asphalt measuring tank 2, the quality can be further improved.

  Moreover, since the 2nd asphalt supply pipe | tube 30 is connected with the 1st subpipe 12, even if it is an existing asphalt supply apparatus, the 2nd unit Y can be installed easily. That is, for example, when the second asphalt supply pipe 30 is newly connected to the asphalt tanks A1 to A3, the work must be performed after the asphalt in the asphalt tank has to be removed once, so that the work is complicated. However, according to this embodiment, since the 2nd asphalt supply pipe 30 should just be connected to the existing 1st subpipe 12, installation work can be performed easily.

Here, when three asphalt tanks are used as in this embodiment, the asphalt tanks A1 to A3 and the asphalt measuring tank 2 are newly connected by three pipes each having a pump capable of forward and reverse. Is also possible. However, according to such a configuration, there is a problem that the number of asphalt tanks is required for the pumps and the equipment cost is increased.
However, like the asphalt supply apparatus 1 according to the present embodiment, the second main pipe 31 and the second main pipe 31 are connected to the second sub pipes 32a to 32c connected to the asphalt tanks A1 to A3. By installing a pump in a part of the pump, an increase in the number of pumps can be suppressed and equipment costs can be reduced.

  Although the embodiment according to the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the present embodiment, three asphalt tanks are used, but two may be used, or four or more. Moreover, in this embodiment, although comprised with the piping which consists of two units, you may comprise the piping which consists of three or more units according to the number of asphalt tanks.

It is the whole schematic diagram showing the asphalt supply device in this embodiment. It is the schematic which showed the 1st unit of the asphalt supply apparatus in this embodiment. It is the schematic which showed the 2nd unit of the asphalt supply apparatus in this embodiment. It is the whole schematic diagram showing the asphalt supply device in this embodiment. It is the schematic which showed the conventional asphalt supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Asphalt supply apparatus 2 Asphalt measuring tank 10 1st asphalt supply pipe 20 1st asphalt return pipe 30 2nd asphalt supply pipe 40 2nd asphalt return pipe 50 Additive piping A1-A3 Asphalt tank B Additive tank F Stirrer H1 -H16 Directional switching valve N1-N3 Pump P, Q, R Asphalt S Additive T Flow meter X First unit Y Second unit Z Additive unit

Claims (4)

A plurality of asphalt tanks for storing asphalt;
An asphalt measuring tank for measuring the asphalt;
A first main pipe connected to the asphalt measuring tank, and a first asphalt supply pipe including a plurality of first sub pipes connecting the individual asphalt tanks and the first main pipe;
A pump installed in the first main pipe and capable of forward / reverse operation;
A direction switching valve installed at each branch of the first asphalt supply pipe;
In an asphalt supply apparatus having
A second main pipe connected to the asphalt measuring tank, and a second asphalt supply pipe comprising a plurality of second sub pipes for connecting the individual first sub pipes and the second main pipes;
A pump installed in the second main pipe and capable of forward / reverse operation;
A direction switching valve installed at each branch of the second asphalt supply pipe;
An asphalt supply device comprising:   The asphalt supply device according to claim 1, wherein the asphalt measuring tank has a stirrer. Having an additive tank with additives mixed into the asphalt;
The asphalt supply apparatus according to claim 1 or 2, wherein the asphalt measuring tank and the additive tank are connected via an additive pipe having a flow meter.   The position of the second asphalt supply pipe close to the asphalt metering tank and a second asphalt return pipe for connecting the asphalt tank to the second asphalt supply pipe. The asphalt supply apparatus as described.

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