Method and apparatus for flushing asphalt feeding devices
First Claim
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1. For use by a wheeled unit for repairing roadway surfaces with a heated repair material, delivered from a storage tank through a first valve at an output of the storage tank, a feed line and at least a second multi-position valve to a mixing and dispensing head, a method for clearing and flushing the feed line, comprising:
- a) moving the first valve to a first position coupling the feed line to the storage tank;
b) moving the second valve to a blowout position to couple a pressurized air line to the feed line, causing the heated repair material in the feed line to return to the storage tank;
c) moving the first valve to a second position decoupling the storage tank from the feed line and coupling the feed line to a flush tank containing a cleaning agent under pressure; and
d) moving the second valve to a flush position decoupling the air line from the feed line and coupling the feed line to a recovery tank, whereby cleaning agent from the flush tank flushes the feed line and is collected in the recovery tank for return to the flush tank.
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Accused Products
Abstract
A vehicle mounted patching system for patching potholes and the like and incorporating method and apparatus for removing and flushing asphalt emulsion from the feed lines of the patcher which completely recycles the cleaning agent used to flush the feed lines, as well as eliminating any external discharge of potentially toxic materials.
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Citations
28 Claims
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1. For use by a wheeled unit for repairing roadway surfaces with a heated repair material, delivered from a storage tank through a first valve at an output of the storage tank, a feed line and at least a second multi-position valve to a mixing and dispensing head, a method for clearing and flushing the feed line, comprising:
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a) moving the first valve to a first position coupling the feed line to the storage tank; b) moving the second valve to a blowout position to couple a pressurized air line to the feed line, causing the heated repair material in the feed line to return to the storage tank; c) moving the first valve to a second position decoupling the storage tank from the feed line and coupling the feed line to a flush tank containing a cleaning agent under pressure; and d) moving the second valve to a flush position decoupling the air line from the feed line and coupling the feed line to a recovery tank, whereby cleaning agent from the flush tank flushes the feed line and is collected in the recovery tank for return to the flush tank. - View Dependent Claims (2, 3, 4)
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5. For use by a wheeled unit for repairing roadway surfaces with a heated repair material, delivered from a storage tank through a first valve at an output of the storage tank, a feed line containing a flow rate valve and at least a second multi-position valve selectively coupled to a mixing and dispensing head, a method, comprising:
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a) closing the flow rate valve; b) moving the first valve to a first position decoupling the storage tank from the feed line and coupling the feed line to an air pressure line; c) moving the second multi-position valve to a patching position to couple the feed line to the mixing head; d) opening the flow rate valve to enable air pressure from the air pressure line to clear the feed line, second multi-position valve and mixing head preparatory to a repair operation; e) closing the flow rate valve and moving the first valve to a second position coupling the storage tank to the feed line and decoupling the air line from the feed line; and f) opening the flow rate valve, causing the heated repair material to flow into the mixing head.
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6. A method for flushing a feed line which feeds asphalt from a source of asphalt to a dispensing device, comprising:
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disconnecting the feed line from the dispensing device; blowing air into a downstream end of the feed line to return asphalt in the feed line to said source; feeding a cleaning agent from a pressurized flush tank into the upstream end of the feed line; and collecting the cleaning agent leaving the feed line in a recovery tank for subsequent reuse by the flush tank and to thereby prevent external discharge of the cleaning agent. - View Dependent Claims (7, 8)
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9. Apparatus for flushing a feed line which feeds asphalt from a source of asphalt to a dispensing device, comprising:
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a first valve for disconnecting the feed line from the dispensing device and connecting the feed line to a recovery tank; a second valve for decoupling the feed line from said source of asphalt and connecting the feed line to a flush tank containing a cleaning agent under pressure, whereby the cleaning agent flushes the feed line and is collected in a recovery tank, thereby fully recycling the cleaning agent.
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10. Apparatus for use by a wheeled unit for repairing roadway surfaces with a heated repair material, comprising:
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a source delivering repair material through a first multi-position valve at an output of the storage tank, a feed line and at least a second multi-position valve to a mixing and dispensing head; said first multi-position valve having a first position coupling the feed line to the storage tank; said second multi-position valve having a blowout position coupling a pressurized air line to the feed line, causing repair material in the feed line to be returned to said source; said first multi-position valve having a second position decoupling the storage tank from the feed line and coupling the feed line to a flush tank containing a cleaning agent under pressure; and said second multi-position valve having a flush position decoupling the air line from the feed line and coupling the feed line to a recovery tank, whereby cleaning agent from the flush tank flushes the feed line and is collected in the recovery tank for subsequent return to the flush tank. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. Apparatus for collecting a cleaning agent used to flush a feed line for feeding asphalt from a source to a dispensing device, comprising:
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a tank having an interior wall separating the tank into a recovery compartment and a flush compartment; a flush valve coupled between said flush compartment and one end of said feed line; an air pressure line coupled to the flush compartment through an inlet pressure valve; a vent line coupled to said flush compartment by an air release valve; said recovery compartment being selectively coupled to said feed line; and a poppet valve arranged in an opening in said interior wall and having a bias member to urge said poppet valve to a closed position, whereby the flush compartment, containing cleaning agent is pressurized when said inlet pressure valve is opened and said air release valve is closed, causing said poppet valve to close said opening; and a recovery valve coupled between said recovery compartment and another end of said feed line; whereby pressurized cleaning agent in said flush compartment flows into said feed line and enters said recovery compartment when said flush valve and said recovery valve are opened, said poppet valve opening responsive to cleaning agent in the recovery compartment urging the poppet valve to open against the bias member and said air release valve is open to drain cleaning agent from the recovery compartment into the flush compartment when said vent valve is opened. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. Apparatus for collecting a cleaning agent used to flush a feed line for feeding a material from a source to a dispensing device, comprising:
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an air-tight tank having an interior wall separating the tank into a recovery compartment and a flush compartment; the flush compartment having a first opening for selective coupling to one end of the feed line; the flush compartment having a second opening for receiving air from a pressurizing source and a third opening for releasing pressure in the flush compartment; said recovery compartment having a first opening to couple the recovery compartment to another end of the feed line for recovering the cleaning agent; a poppet valve arranged in an opening in said interior wall, movable between a sealed and an unsealed position and normally biased to lightly seal said interior wall opening by a biasing member; whereby the flush compartment, containing cleaning agent, is pressurized when air is introduced into the second opening of the flush compartment and the third opening of the flush compartment is closed; the cleaning agent passing out of the flush compartment, through the feed line and collecting in the recovery compartment when the flush compartment first opening and the recovery compartment first opening are fluid-coupled to the feed line; and cleaning agent collected in the recovery tank exerts a force greater than said biasing member and returns to the flush compartment when the flush compartment is depressurized. - View Dependent Claims (26)
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27. For use by a wheeled unit for repairing roadway surfaces with a heated repair material, delivered from a storage tank through a first valve at an output of the storage tank, a feed line and second and third multi-position valves to selectively couple the feed line to first and second inputs of a mixing and dispensing head, a method for clearing and flushing the feed line, comprising:
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a) moving the first valve to a first position coupling the feed line to the storage tank; b) moving the second and third multi-position valves to a blowout position to couple a pressurized air line to the feed line, causing the heated repair material in the feed line to return to the storage tank; c) moving the first valve to a second position decoupling the storage tank from the feed line and coupling the feed line to a flush tank containing a cleaning agent under pressure; and d) moving the second and third multi-position valves to a flush position decoupling the air line from the feed line and coupling the feed line to a recovery tank, whereby cleaning agent from the flush tank flushes the feed line and the second and third multi-position valves and is collected in the recovery tank for subsequent return to the flush tank. - View Dependent Claims (28)
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Specification