Additive injection device for paving machines

On a paving machine having a spreader and a compacting screed for forming a mat of aggregate material as the machine is moved along a path, a device for injecting an additive into the aggregate material prior to formation of the mat, comprising:

• a hopper for receiving the aggregate material;
• a mixing conveyor including a pair of augers arranged to convey the aggregate material from the hopper to the spreader and to mix the aggregate material as the aggregate material is being conveyed;
• and
• a conduit mounted within the hopper and being disposed generally adjacent the mixing conveyor and extending along a length thereof, the conduit being in flow communication with an additive source, the conduit being adapted to communicate additive from the additive source to the aggregate material.

On a machine for forming a mat of aggregate material as the machine is moved along a path, a system for injecting a liquid additive into the aggregate material prior to formation of the mat, comprising:

• a hopper for storing the aggregate material;
• a spreader disposed in front of a compacting screed;
• a mixing conveyor for conveying the aggregate material from the hopper to the spreader and for mixing the aggregate material substantially along the length of the conveyor;
• and
• injecting means for injecting the liquid additive into the aggregate material, the injecting means being adapted to inject the liquid additive substantially along a length of the mixing conveyor, the injecting means further including a plurality of injection nozzles disposed within the hopper and being located generally adjacent to the mixing conveyor.

A paving machine having a system for injecting a liquid additive into an aggregate material, comprising:

• a hopper for storing the aggregate material;
• a spreader for distributing the aggregate material generally transversely relative to a path of the machine;
• a compacting screed for compacting the aggregate material into a mat;
• a mixing conveyor adapted to convey the aggregate material from the hopper to the spreader and to mix the aggregate material as the aggregate material is being conveyed;
• and
• means disposed in the hopper generally adjacent to the mixing conveyor and extending substantially along a length of the mixing conveyor for injecting the liquid additive into the aggregate material, whereby the liquid additive may be mixed with the aggregate material by the mixing conveyor.

A device for applying a mat of aggregate material having an entrained additive as the device is moved along a path, comprising:

• a hopper for receiving the aggregate material;
• a spreader for spreading the aggregate material generally transversely relative to the path;
• a compacting screed for compacting the aggregate material into the mat;
• a mixing conveyor arranged to convey the aggregate material from the hopper to the spreader and to mix the aggregate material along the length of the conveyor;
• a conduit in flow communication with an additive source, the conduit having a plurality of nozzles and being disposed to span a portion of the hopper to communicate the additive from the additive source to the aggregate material;
• a pair of elongated members spanning the hopper and being disposed over the conveyor, the conduit being mounted between the elongated members by a plurality of transverse mounting brackets.

On a paving machine having a spreader and a compacting screed for forming a mat of aggregate material as the machine is moved along a path, a device for injecting an additive into the aggregate material prior to formation of the mat, comprising:

• a hopper for receiving the aggregate material;
• a mixing conveyor arranged to convey the aggregate material from the hopper to the spreader and to mix the aggregate material as the aggregate material is being conveyed;
• a pair of elongated members spanning the hopper and being disposed over the conveyor;
• a conduit mounted between the elongated members by a plurality of mounting brackets and being disposed adjacent the mixing conveyor, the conduit being in flow communication with an additive source, the conduit being adapted to communicate additive from the additive source to the aggregate material.

On a machine for forming a mat of aggregate material as the machine is moved along a path, a system for injecting a liquid additive into the aggregate material prior to formation of the mat, comprising:

• a hopper for storing the aggregate material;
• a spreader disposed in front of a compacting screed;
• a mixing conveyor for conveying the aggregate material from the hopper to the spreader and for mixing the aggregate material substantially along the length of the conveyor;
• a pair of elongated members spanning the hopper and being disposed over the conveyor;
• and
• injecting means for injecting the liquid additive into the aggregate material, the injecting means being supported by the elongated members.