Work Machine Cable Oscillation Damping via Contact Pressure
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Solution Overview
Problem
Cable oscillations during the lowering of a work element in construction machines can lead to untidy winding on the winding drum, causing damage and increased wear, as existing guide means are often overloaded or bypassed, reducing the service life and maximum bearing load of the support cable.
Innovation Solution
A cable contact pressure means with adjustable contact pressure elements, controlled by a unit, applies a defined force to the support cable when the work element strikes the base surface, counteracting oscillations and maintaining cable tension, thereby preventing propagation of oscillations to the winding drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the work element is lowered quickly by unwinding the support cable, then the productivity is improved, but cable oscillations occur when the work element strikes the base surface
Solution Approach 1:
A cable contact pressure means with at least one contact pressure element is introduced as an intermediary between the support cable and the winding drum. This mediator applies a defined contact pressure force to the cable when oscillations occur, dampening the oscillations without interfering with normal cable operation or the quick lowering function.
Solution Approach 2:
The cable contact pressure means is positioned and configured to act preemptively on the support cable before oscillations can propagate to the winding drum. By applying contact pressure at the optimal location and timing, the system prevents harmful oscillations from developing during quick lowering operations.
2Speed
If cable oscillations occur during lowering, then the work element can reach the base surface quickly, but the cable winding on the winding drum becomes untidy and damaged
Solution Approach 1:
The cable contact pressure means serves as a protective intermediary that absorbs and dampens cable oscillations before they can reach the winding drum. This prevents the untidy winding and damage that would otherwise occur during quick lowering operations.
Solution Approach 2:
The contact pressure element is positioned to provide cushioning protection to the support cable in advance of where oscillations would cause damage. This beforehand cushioning prevents the propagation of oscillations to the winding drum, ensuring reliable cable winding even during high-speed operations.
3Manufacturing precision
If guide means are provided on the winding drum to guide the support cable, then the cable winding is improved, but the guide means are overloaded and damaged by cable oscillations
Solution Approach 1:
The cable contact pressure means acts as a protective intermediary that dampens cable oscillations before they can reach and overload the guide means on the winding drum. This preserves the durability of the guide means while maintaining proper cable winding quality.
4Productivity
If the support cable is subjected to cable oscillations, then the lowering operation can proceed quickly, but the service life and maximum bearing load of the support cable are reduced
Solution Approach 1:
The cable contact pressure means serves as a protective intermediary that dampens oscillations during quick lowering operations, preventing the reduction of support cable service life and maximum bearing load that would otherwise result from repeated oscillation exposure.
Solution Approach 2:
The contact pressure element provides beforehand cushioning to the support cable, protecting it from the damaging effects of oscillations during high-speed lowering operations. This extends the service life and maintains the maximum bearing load capacity of the cable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses cable oscillations, reducing wear and friction, and ensures proper winding on the drum, extending the service life and maintaining the maximum bearing load of the support cable, especially in freefall modes where high impact momentum is intended.
Implementation Method 1
a cable contact pressure means with at least one contact pressure element is provided, which means can be adjusted into a contact pressure position by a control unit, by means of an actuating member, in order to counteract a cable oscillation of the support cable when the work element strikes the base surface, in which contact pressure position the contact pressure element rests on the support cable at a contact pressure force
Implementation Method 2
a cable contact pressure means with at least one contact pressure element is provided, which means can be adjusted into a contact pressure position by a control unit, by means of an actuating member
Data Source
AI summary
The invention relates to a work machine, comprising a mast having a mast head, a support cable which is guided along the mast, over the mast head, a cable winch comprising a rotatably mounted winding drum to which the support cable is attached for winding up and unwinding, a work element which is arranged on the support cable for vertical movement, and a control unit, by means of which the cable winch can be operated in an unwinding mode, for unwinding the support cable from the winding drum, in which mode the work element is lowered, on the support cable, as far as a base surface. According to the invention, a cable contact pressure means comprising at least one contact pressure element is provided, which element can be adjusted into a contact pressure position by the control unit, by means of an actuating member, in order to counteract a cable oscillation of the support cable when the base surface is struck, in which contact pressure position the contact pressure element rests on the support cable at a contact pressure force.