Two feed conveyors and two spreader augers are independently driven, each by its own drive motor. The control means for each feed conveyor includes a sensor at the discharge end of the feed conveyor and means responsive to changes in the level of the paving material at the sensor for proportionally increasing the drive speed of the conveyor as the level drops and proportionally decreasing the drive speed of the conveyor as the level rises. The control means for each auger includes a sensor adjacent the discharge end of the auger and means responsive to changes in the level of the paving material at the sensor for proportionally increasing the drive speed of the auger as the level drops and proportionally decreasing the drive speed of the auger as the level rises.
A paving machine for zero or minimum clearance applications includes a tractor for moving a pan assembly in a desired direction of travel on a roadway to be paved in order to form a quantity of concrete mud into a slab of desired width and elevation. The pan assembly has a pan that extends laterally substantially the full desired width and rearwardly from a leading edge portion of the pan to a trailing edge portion of the pan. Components are provided for mounting the pan assembly on the tractor so that the leading edge portion of the pan is disposed rearwardly of at least one of the left and right tracks. Multiple sensors may be included for independent elevation control of the pan along with mounting components for lateral adjustment of the pan assembly and dual screeds for better control of the concrete mud.
The invention is directed to automated controls of an asphalt paver wherein the speed of the conveyor is automatically controlled at a rate proportional and responsive to the speed of the auger and the conveyer is free from having a material sensor and speed control responsive thereto.
In apparatus for injecting and mixing a ground stabilization agent into the material of the earth during the operation of an earth drill, a device is provided for generating signals indicative of the upward movement of the earth drill as the drill is withdrawn and while the stabilization agent is being introduced, and a weighing device is provided for constantly weighing the remaining supply of ground stabilization agent and for thereby measuring the weight of stabilization agent delivered to the ground, and a recorder is connected to receive signals from both of the devices for providing a graphic record of the stabilization agent delivered versus the upward travel of the earth drill.
A unitary flight chain assembly for a paver is illustrated as having mounting structure for removably positioning same upon a support structure carried beneath the hopper of the paver, and removable covers are provided to facilitate lifting the flight chain assembly out of the paver and for replacement thereof.
The finding produces a self-propelled vibratory finishing machine for asphalting road surfaces comprising a frame which supports a storage device and distribution of the bitumen to be deposited on the surfaces comprising a pair of screw feeders moved by a transmission unit and a pressing device the deposited bitumen aggregate set behind the screw feeders. Connected to the transmission unit and next to the screw feeders there is a flow divider device having surfaces symmetrically shaped to create at least one cutting edge suited to aid the flow of bitumen towards the screw feeders.
