Construction machine, as well as method for milling off and transporting away a milled-off stream of material of a construction machine

Patent metadata

Field	Value
Publication number	US-10337155-B2
Application number	US-201715830052-A
Country	US
Kind code	B2
Filing date	Dec 4, 2017
Priority date	Dec 20, 2013
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

In a self-propelled construction machine, in particular cold milling machine, recycler or surface miner, for working ground surfaces, comprising a milling drum supported at a machine frame and a conveying device arranged at the machine frame which accepts the milled-off material from the milling drum during the working operation and, on a continuously revolving first transport belt, unloads it, in conveying direction, onto a point of discharge at a discharge end along a parabolic trajectory, it is provided for the following features to be achieved: as a minimum, the last section of the conveying device as seen in conveying direction comprises no less than one continuously revolving cover belt arranged above the transport belt, said cover belt extending essentially parallel to the transport belt and resting against the milled-off material on the transport belt at least in a partial section of the length of the transport belt.

First claim

What is claimed is:

1. A cold milling machine for working ground surfaces, comprising:
a machine frame;
a milling drum supported from the machine frame;
a plurality of wheels or tracks supporting the machine frame from the ground surface so that the cold milling machine is a self-propelled mobile cold milling machine having a direction of travel during working operation;
a conveyor system arranged to accept milled-off material from the milling drum during working operation, and to unload the milled-off material in a conveying direction from a discharge end of the conveyor system along a parabolic trajectory onto a discharge point, the conveyor system including:
at least one continuously revolving transport belt having a length and having a transport belt discharge end, the at least one continuously revolving transport belt including a transport belt frame; and
at least one continuously revolving cover belt arranged above at least a last section of the transport belt in the conveying direction adjacent the transport belt discharge end, the cover belt extending essentially parallel to the length of the transport belt, the cover belt being configured to rest against milled-off material carried by the transport belt in at least a portion of the length of the transport belt to aid in controlling the parabolic trajectory of the milled-off material to the discharge point during working operation of the self-propelled mobile cold milling machine, the at least one continuously revolving cover belt including a cover belt frame, the cover belt frame being adjustable in height relative to the transport belt frame;
wherein at least a portion of the conveyor system is arranged to pivot relative to the machine frame such that both an inclination of the conveyor system and a lateral alignment of the conveyor system relative to the machine frame are adjustable.

2. The cold milling machine of claim 1 , wherein:
the cover belt is pre-tensioned toward the transport belt.

3. The cold milling machine of claim 1 , wherein:
the at least one continuously revolving cover belt comprises two successive cover belts arranged above the transport belt.

4. The cold milling machine of claim 1 , wherein:
the transport belt is foldable, and the transport belt includes the last section and another section, the last section being pivotable downwards relative to the other section to a transport position; and
the cover belt covers at least the last section of the transport belt.

5. The cold milling machine of claim 1 , wherein:
the transport belt includes an upper strand and a lower strand, and support rollers for the upper strand, the support rollers supporting the upper strand such as to form a transport channel having a concave cross-section on the upper strand of the transport belt.

6. The cold milling machine of claim 5 , wherein:
the support rollers for the upper strand of the transport belt each comprise multiple roller segments coupled to one another in an articulated fashion.

7. The cold milling machine of claim 1 , wherein:
the at least one cover belt includes an upper strand and a lower strand, and support rollers for the lower strand, the support rollers allowing a flexible adjustment of a cross-sectional shape of the lower strand of the cover belt so that the lower strand contacts a quantity of milled-off material present on the transport belt.

8. The cold milling machine of claim 7 , wherein:
the support rollers for the lower strand of the cover belt have an articulated connection to a side frame of the conveyor system, and the support rollers are resiliently pre-tensioned toward the transport belt.

9. The cold milling machine of claim 7 , wherein:
the support rollers for the lower strand of the cover belt each comprise multiple roller segments coupled to one another in an articulated fashion.

10. The cold milling machine of claim 1 , wherein:
the cover belt has an inlet end and an outlet end;
the outlet end of the cover belt diverges from the transport belt in a conveying direction; and
the inlet end of the cover belt converges toward the transport belt in the conveying direction.

11. The cold milling machine of claim 1 , wherein:
the transport belt includes a last transport belt deflection roller in the conveying direction;
the at least one cover belt includes a last cover belt deflection roller in the conveying direction; and
one of the last transport belt deflection roller and the last cover belt deflection roller is pivotable relative to the other.

12. A method of operating a self-propelled cold milling machine including a milling drum, the method comprising:
(a) milling off material from a ground surface with the milling drum as the cold milling machine moves across the ground surface;
(b) accepting milled-off material from the milling drum on a conveyor as the cold milling machine moves across the ground surface;
(c) transporting the milled-off material between a lower transport belt and an upper cover belt of the conveyor along at least a part of a length of the lower transport belt to a discharge end of the conveyor as the cold milling machine moves across the ground surface;
(d) discharging the milled-off material from the discharge end of the conveyor along a parabolic trajectory to a point of discharge as the cold milling machine moves across the ground surface;
(e) pivoting the conveyor relative to the machine frame such that both an inclination of the conveyor and a lateral alignment of the conveyor relative to the machine frame are adjusted; and
(f) adjusting a height of a cover belt frame of the upper cover belt relative to a transport belt frame of the lower transport belt.

13. The method of claim 12 , further comprising:
resiliently pre-tensioning at least a part of the cover belt towards the transport belt such that the cover belt contacts the milled-off material on the transport belt along at least part of the transport belt.

14. The method of claim 12 , further comprising:
folding a front section of the conveyor to a transport position and locking the front section of the conveyor in the transport position.

15. The method of claim 12 , wherein:
in step (c), the lower transport belt defines a transport channel carrying the milled-off material, and a lower strand of the upper cover belt is pressed against the milled-off material on the lower transport belt so that a cross-sectional shape of the lower strand of the upper cover belt varies from a convex to a concave shape depending on a quantity of milled-off material carried on the lower transport belt.

Assignees

• Wirtgen Gmbh

Inventors

• Berning Christian
• Barimani Cyrus
• Hörnig Martin

Classifications

• E01C23/127

  rotary, e.g. rotary hammers · CPC title

• B65G15/16

  between an auxiliary belt and a main belt · CPC title

• E01C23/088 Primary

  Rotary tools, e.g. milling drums {(for forming recesses to receive marking materials E01C23/0946)} · CPC title