JPH0333562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is a method for automatically transferring a molten material such as asphalt emulsion, which is a high-temperature, high-viscosity liquid, to a container such as a drum through a syringe connected to a molten material supply source through piping. The present invention relates to an automatic filling device for melt filling.

``Prior art'' Conventionally, as a device for filling drums with asphalt emulsion, a valve piston that opens and closes the nozzle from the inside is slid up and down in a single vertical injection cylinder with a nozzle installed at the bottom end using a valve rod. 1 fitted in a movable manner
A syringe is installed on the support, and the drum is conveyed to the bottom of the syringe so that its melt inlet/outlet is aligned with the nozzle of the injection cylinder.Then, the valve piston is raised to open the nozzle, and the asphalt emulsion is poured into the drum. It is known to inject the melt into it from outside the melt inlet/outlet.

``Problems to be Solved by the Invention'' However, according to this method, it is difficult to control the flow rate of asphalt emulsion to adjust the injection flow rate at any time.

An object of the present invention is to enable such control to be performed easily.

"Means for Solving the Problems" A feature of the present invention is that two large and small injection cylinders 1a and 2a having nozzles 1b and 2b at their lower ends are vertically arranged side by side, and these injection cylinders 1a and 2a are Connected to the common supply main pipe 4, large and small valve pistons 5 and 6 for opening and closing the nozzles 1b and 2b from the inside are fitted into these injection cylinders 1a and 2a, respectively, so as to be able to slide vertically. The piston rods 9a, 10b of the cylinder devices 9, 10 corresponding to the injection cylinders 1a, 2a, respectively, and the large and small valve pistons 5, 6 are connected via valve rods 7, 8, respectively. Air passages 11 and 12 are provided for injecting air from the lower end surfaces of the valve pistons 5 and 6.

"Operation" Now, if the injection flow rate by the large injection tube 1a is A, and the injection flow rate by the small injection tube 1b is B, then the overall result when the nozzle 1b of the large injection tube 1a is opened and the nozzle 2b of the small injection tube 2a is closed. The injection flow rate is A. Conversely, when the nozzle 1b of the large injection barrel 1a is closed and the nozzle 2b of the small syringe 2a is opened, the total injection flow rate is B.
When both the nozzles 1b and 2b of the large and small injection cylinders 1a and 2a are open, the total injection flow rate is A+B, and the injection flow rate can be adjusted in three large steps. Moreover, the molten material remaining on the nozzles 1b and 2b can be blown off by air injection in the large and small injection tubes 1a and 2a, respectively.

``Example'' An example of the present invention will be described in detail below with reference to the drawings.

This automatic filling device uses two large and small syringes 1 and 2 as shown in FIGS. 1 to 3 to fill asphalt emulsion into a drum can 3 as shown in FIGS. 4 to 9. These syringes 1 and 2 are installed perpendicularly to a support (not shown), and are supplied with asphalt latex from an asphalt latex supply source through a supply main pipe 4.

The two large and small syringes 1 and 2 are arranged side by side with the outer peripheral surfaces of their injection cylinders 1a and 2a having different diameters touching each other, and valve pistons 5 and 6 are installed in the respective injection cylinders 1a and 2a. It is fitted so that it can slide up and down.
The combined size of the two large and small injection cylinders 1a and 2a is such that it can be inserted into the melt inlet/outlet 3a of the drum can 3. Two large and small valve pistons 5, 6 are connected to piston rods 9a, 10 of a pair of cylinder devices 9, 10 via valve rods 7, 8, respectively.
The nozzles 1b, 2 at the lower end are connected to the cylinders 1a, 2a and individually slid up and down by the respective cylinder devices 9, 10, respectively.
b can be opened and closed individually. The valve stem 7 and the valve piston 5 are provided with an air passage 11 extending from the upper end of the valve stem 7 to the center of the lower surface of the valve piston 5.
An air passage 12 is provided from the upper end to the center of the lower surface of the valve piston 6. These air passages 1
Air is fed into the valve pistons 1 and 12 from external air hoses 13 and 14, and the air can be injected from the center of the lower surface of the valve pistons 5 and 6.

The injection barrel 1a of the large syringe 1 is connected at its midpoint to the tip of the main supply pipe 4, whereas the small syringe 2
The injection cylinder 2a is connected at its midpoint to the tip of a bypass 4a branched from the tip of the main supply pipe 4, and this connection forms inlets 1c and 2c at their midpoints, respectively. An electromagnetic flow rate adjustment valve 15 is provided midway through the main supply pipe 4, and the asphalt emulsion is supplied to both the injectors 1 and 2 via this flow rate adjustment valve 15.

Below these large and small syringes 1 and 2, there is a fourth
As shown in the figure, a lifter (for example, a table lifter) 17 is installed, which moves up and down while placing the drum can 3 conveyed by the carry-in conveyor 16. A roller conveyor 18 is provided on the lifter 17, as well as a stopper for positioning the drum can 3 and a known load cell for measuring the weight of the drum can 3, although not shown.

The drum 3 is filled with asphalt emulsion as follows.

In FIG. 4A, when the drum 3 transported by the carry-in conveyor 16 is placed on the lifter 17 in the lower position, the lifter 17 rises and lifts the drum 3, and the melt inlet/outlet 3a is lifted. Both injection cylinders 1a and 2a enter into the area. At this time, both valve pistons 5 and 6 descend to open the nozzles 1b and 1b.
2b are closed, and when the lifter 17 rises to a predetermined height, the cylinder devices 9 and 10 are activated, and both valve pistons 5 and 6 are raised above the inlets 1c and 2c, and then stopped in the state shown in A. do. In this state, the flow rate adjustment valve 15 is opened approximately half way as shown in FIG. Ru.

When the required amount of asphalt emulsion (for example, about 1/4 of the specified weight) is injected into the drum can 3 (for example, a timer operates for a set time), the lifter 17 is lowered to the intermediate position as shown in FIG. 5A. , and the flow rate adjustment valve 15 is fully opened as shown in FIG.
Both injection cylinders 1a and 2a are slightly connected to the melt inlet/outlet 3a.
In this state, asphalt emulsion is injected into the drum 3 at a large flow rate through both injection cylinders 1a and 2a. At the same time, weighing of the drum can 3 by the load cell on the lifter 17 is started.

For example, if the amount of asphalt emulsion to be injected is the specified weight.
When the load cell reaches approximately 90% and a pulse representing the detection is output from the load cell, the cylinder device 9 on the large injector 1 side is operated to return, and the valve piston 5 moves into the large injector 1.
Descending while pushing out the asphalt emulsion in a,
At the lower limit position, the nozzle 1b of the large injection cylinder 1a is closed as shown in FIG. 6A, and at the same time, the flow rate regulating valve 15 is closed to 2/3 as shown in FIG. 6B. Therefore, the asphalt emulsion is poured into the small injection tube 2a.
The liquid is injected into the drum 3 at a flow rate lower than that at the beginning of injection.

When the amount of asphalt emulsion to be injected reaches the specified weight and a pulse representing this is output from the load cell, the cylinder device 10 on the small syringe 2 side operates to return and the valve piston 6 injects the asphalt emulsion in the small injection cylinder 2a. descends while pushing out the 7th position at the lower limit position.
As shown in Figure A, the nozzle 2b of the small injection cylinder 2a is closed, and at the same time, the flow rate regulating valve 15 is completely closed as shown in Figure B, and the injection of the asphalt emulsion is stopped. Therefore, the transition of the injection flow rate from the start of injection of asphalt emulsion to the end of injection is as shown in FIG.

After this, as shown in FIGS. 8A and 8B, the flow rate adjustment valve 15 is closed, and the nozzles 1 of both injection tubes 1a and 2a are closed.
b, 2b remain closed by the valve pistons 5, 6, air is injected from the center of the lower surface of the valve pistons 5, 6 through the air passages 11, 12 of both valve rods 7, 8. As a result, the remaining asphalt latex attached to the lower surfaces of the valve pistons 5 and 6 and the nozzles 1b and 2b are blown away and enter the drum can 3, so that the remaining asphalt latex is fed into the next stage. It will not fall onto the outside of the drum and contaminate it.

When the drum 3 is filled with a specified weight of asphalt emulsion in this way, the lifter 17 is lowered and both injection cylinders 1a and 2a are pulled out from the melt inlet/outlet 3a as shown in FIG. , the drum can 3 is transferred onto a conveyor 19 for carrying out and carried out.

"Effects of the Invention" As described above, the present invention has the following effects.

The injection flow rate can be adjusted in three stages by opening and closing the nozzles of the large and small injection barrels, allowing accurate measurement of the filling amount and reducing filling unevenness.

The molten material remaining on the nozzle can be blown off by air injection in the large and small injection tubes.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and the first, second, third
The figures are longitudinal sectional views, side views, and cross sectional views of large and small syringes, and Figs. 4 to 9 are explanatory diagrams showing the asphalt emulsion filling operation in order of operation. In each figure, A indicates a drum and a large syringe. Relationship with small injection cylinder, B
indicates the open/closed state of the flow rate adjustment valve. Moreover, FIG. 10 is a graph showing the transition of the injection flow rate. 1a, 2a...Large and small injection cylinders, 1b, 2b...
Nozzle, 4... Main supply pipe, 5, 6... Large/small valve piston, 7, 8... Valve rod, 9, 10... Cylinder device, 9a, 10a... Piston rod, 11,
12...Air passage.

Claims (1)

[Claims] 1 Two large and small injection cylinders 1a and 2a having nozzles 1b and 2b at their lower ends are arranged vertically side by side,
These injection cylinders 1a, 2a are connected to a common supply main pipe 4, and inside these injection cylinders 1a, 2a, large and small valve pistons 5, 6 that open and close the nozzles 1b, 2b from the inside are slid up and down, respectively. The piston rods 9a, 10b of the cylinder devices 9, 10 corresponding to the injection cylinders 1a, 2a, respectively, and the large and small valve pistons 5, 6 are fitted into the valve rods 7, 6, respectively.
An automatic melt filling device characterized in that the valve rods 7 and 8 are provided with air passages 11 and 12 for injecting air from the lower end surfaces of the valve pistons 5 and 6.