JPH0355602Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sealing device for an asphalt mixture storage container for storing an asphalt mixture which is a road paving material.

[Prior Art] Asphalt mixtures tend to undergo oxidative deterioration when exposed to air. Therefore, when storing asphalt mixtures in storage containers for long periods of time, it is necessary to prevent air from entering the container. Maintaining the airtightness of the discharge gate is an important issue, and various airtight mechanisms have been adopted. For example, the simplest method is to use an elastic body such as a rubber gasket to seal the material outlet.

[Problems to be solved by the invention] However, although the seal structure using rubber gaskets is relatively inexpensive and simple in structure,
As the sealing material deteriorates over time, the airtightness may be compromised and air may be sucked in. In addition, damaged parts of the airtightness are difficult to detect, making it difficult to confirm whether air is being sucked in or not, so it is time for maintenance. It is difficult to judge.

[Means for Solving the Problems] In view of the above-mentioned points, the present invention is designed to solve the above-mentioned problems by providing an asphalt mixture storage with a heating and heat-retaining structure having an input port at the top and a discharge port at the bottom. In the container, an airtight chamber is formed surrounding the material discharge port, a flange is provided around the lower end of the lower material discharge port of the airtight chamber, and two strips of sealing material are provided in parallel on the lower surface of the flange. An inert gas supply port is formed by drilling a through hole at an appropriate position in the flange portion sandwiched between two sealing materials, and a hole is provided below the material discharge port in the vertical direction toward the material discharge port. A cutoff gate that is movable and horizontally movable is provided, and a supply pipe from an inert gas supply source is attached to an inert gas supply port formed in the flange of the material discharge port. The present invention provides a sealing device for an asphalt mixture storage container having the following characteristics.

[Function] According to the present invention, when sealing the material discharge port,
After horizontally moving the cut-off gate below the material discharge port to the closed position, the top surface of the cut-off gate was pushed up, and the gates were placed in parallel at appropriate intervals on the lower surface of the flange provided around the lower end of the material discharge port. Adhere to the two strips of sealant from below. Thereafter, an inert gas supply port is provided in an annular sealing passage formed by the lower surface of the flange, the two sealing material strips, and the cutoff gate, penetrating between the two sealing material strips from the flange top surface. This system supplies inert gas at a predetermined pressure, and even if a gap occurs due to damage to the outer sealing material, the inert gas will flow out through the gap and prevent air from entering. By checking the supply amount, it can be determined whether the sealing material is damaged, and defective sealing material can be quickly replaced.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 is an asphalt mixture storage container body;
The peripheral wall of the storage container main body 1 is provided with a heating and heat-retaining structure to prevent the asphalt mixture, which is the stored material, from hardening due to a drop in temperature. A material discharge port 2 is formed in the lower part of the storage container body 1, and a pair of butterfly-shaped gates 3, which are effective for discharge control, are connected to a pivot shaft 4.
The piston rod 6 of the fluid cylinder 5 expands and contracts to open the material discharge port 2.
Opening and closing are performed. Although the butterfly gate 3 is effective for controlling the release, it is difficult to form an airtight seal for the material discharge port 2. Therefore, the material discharge port 2 is surrounded by a cover body 7 to form an airtight chamber 8. A cylindrical material discharge port 9 is provided at the bottom of the material discharge port 8, and a flange portion 10 is provided around the lower end of the material discharge port 9. Two strips of sealing material 11 made of an elastic material are arranged side by side at appropriate intervals, and through holes are bored at appropriate positions in the flange portion 10 sandwiched between the two strips of sealing material 11 to form an inert gas supply port. 12 is formed. A cutoff gate 1 is provided below the material discharge port 9.
3 is disposed, and the cutoff gate 13 is connected to the fluid cylinder 1.
An air cylinder 17 is movable forward and backward by the expansion and contraction of the piston rod 15 of No. 4, and is connected to an air source (not shown) via an air hose 16.
This allows the blocking plate 13a to be moved up and down. Further, it is preferable to attach a rubber plate 18 to the portion of the shielding plate 13a that comes into contact with the sealing material 11, if necessary.

Reference numeral 19 denotes a gas cylinder for storing inert gas, and a supply pipe 20 of the gas cylinder is provided with a solenoid valve 21 for controlling the supply and stop of the inert gas, and a flow meter 22, and the supply pipe 20 further has a branch. One supply pipe 20a is connected to the airtight chamber 8 via a manual valve 23.
The other supply pipe 20b is connected to the inert gas supply port 12 formed in the flange portion 10 via a manual valve 24.

Reference numeral 25 denotes an inlet for asphalt mixture, and an inlet gate 27 is opened and closed by a fluid cylinder 26. 28 is a small diameter exhaust port provided at the top of the storage container body 1, and is a small diameter exhaust port provided at the top of the storage container body 1.
This is to gradually exhaust the gas accumulated in the tank 9 to the outside. When the asphalt mixture is discharged from the material discharge port 2, a partial vacuum tends to be formed in the storage container, and simply sucking in outside air through the exhaust port 29 is not sufficient to eliminate this vacuum. A suction port 30 opened at the top is disposed at the top, and a suction gate 32 is opened and closed by a fluid cylinder 31.

Therefore, when sealing the material outlet 9 at the bottom of the airtight chamber 8, the shutoff gate 13 below the material outlet 9 is moved to the closed position by extending the piston rod 15 of the fluid cylinder 14, and the air source (not shown) is moved to the closed position. Air is fed into the air cylinder 17 through the air hose 16, and the blocking plate 13a of the blocking gate 13 is pushed up to make it come into close contact with the two strips of sealing material 11 arranged in parallel to the flange portion 10 of the material discharge port 9 located at the top. This operation brings about a sealed state, but in addition, the inert gas supply port 1 provided in the flange portion 10
2 supplies inert gas to the annular sealing passage 33 formed by the lower surface of the flange portion 10, the two sealing materials, and the blocking plate 13a, thereby reducing the internal pressure in the annular sealing passage 33 to the airtight chamber 8 side and the atmosphere. It is made higher than each of the sides to prevent air from flowing in even if the airtightness of the outer sealing material 11 is impaired. Further, whether or not the airtightness is damaged due to deterioration of the two sealing material 11 due to aging can be determined by closing the manual valve 23 and checking the flow meter 22.

When discharging the mixture in the storage container, after removing the air in the air cylinder 17 and pulling down the blocking plate 13a, the piston rod 15 of the fluid cylinder 14 is contracted and the blocking gate 13 is moved to the open position, and the material discharge port 2 is The talking gate 3 is opened and closed by the expansion and contraction of the piston rod 6 of the fluid cylinder 5 disposed in the cylinder 5, thereby discharging the mixture. At this time, the airtight chamber 8 and the flange part 10
Since the amount of inert gas supplied to the inert gas is small, it may be continued to be supplied, or if necessary, the solenoid valve 31 may be closed to stop the supply.

[Effect of the invention] As described above, in the present invention, the material discharge port 9
Since the sealing material 11 of the flange portion 10 is made into two strips and an inert gas is supplied to the annular sealing passage 33 formed when the sealing gate 13 is sealed,
Even if the airtightness of the sealing material 11 is impaired, air inflow can be prevented, and by checking for leakage by the movement of the flowmeter 22, the airtightness can be prevented due to the airtightness of the sealing material or deterioration due to aging. This has the advantage that it can be easily determined whether the seal is sealed or not, and a reliable sealing structure can be obtained even with a gum seal.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a portion of the present invention. 1... Asphalt mixture storage container body, 2...
...Discharge port, 8...Airtight chamber, 9...Material discharge port, 1
0...Flange part, 11...Sealing material, 12...
Inert gas supply port, 13... Cutoff gate, 13a
...Shutoff plate, 17...Air cylinder, 19...Inert gas cylinder, 22...Flow meter.

Claims (1)

[Scope of utility model registration request] In an asphalt mixture storage container that has an input port at the top and a discharge port at the bottom and has a heating and insulation structure, an airtight chamber is formed surrounding the material discharge port, and the area around the lower end of the bottom material discharge port of the airtight chamber is A flange is provided around the flange along the flange, two strips of sealing material are arranged in parallel on the lower surface of the flange, and through holes are bored at appropriate positions in the flange sandwiched between the two strips of sealing material to inject an inert gas. Forming a supply port, below the material discharge port,
A cutoff gate that can move vertically and horizontally toward the material discharge port is installed, and an inert gas supply port formed in the flange of the material discharge port is connected to the inert gas supply source. A sealing device for an asphalt mixture storage container, characterized in that a supply pipe is attached.