Tamping Machine Guide Offset for Switch Tamping
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Solution Overview
Problem
Existing track tamping machines face limitations in achieving sufficient transverse displacement and rigidity, leading to oscillating behavior and increased maintenance, particularly when tamping switches, which require two separate operations to complete the task effectively.
Innovation Solution
The design incorporates two guides per side with offset heights and longitudinal positions for tamping units, allowing independent transverse displacement of both units, enhanced by a slewing ring for rotational stability and longer adjustment paths, enabling simultaneous tamping of main and branching lines within a switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common sliding guide with horizontal guides is used for tamping units, then the structure is simple, but the bending stiffness is low leading to vibrational behavior and increased fatigue bending stress
Solution Approach 1:
The guide structure is changed from horizontal guides to vertical guides. This dimensional change fundamentally improves the bending stiffness and rigidity of the guide system, eliminating the vibrational behavior that occurred with horizontal guides while maintaining structural simplicity.
2Area of stationary object
If the lateral displacement travel is limited within the machine frame, then the structure remains compact, but the inner tamping unit cannot reach sufficient displacement to tamp the diverging track in a single pass
Solution Approach 1:
The guide system is designed to allow dynamic adjustment of the tamping units' positions. The vertical guides enable the inner tamping unit to achieve greater lateral displacement by combining the lateral movement of the outer unit with independent movement along the vertical guides, allowing turnout tamping in a single pass while maintaining a compact machine frame.
3Adaptability or versatility
If a pivoting support with longitudinal displacement and rotation is used for the outer tamping unit, then the unit can adapt to inclined sleepers in the turnout, but the design becomes mechanically complex and causes oscillation during insertion and tamping
Solution Approach 1:
The adaptation function is segmented into two independent parts: the outer tamping unit handles lateral positioning while the inner tamping unit, guided by vertical guides, handles the adaptation to inclined sleepers through its independent vertical guide movement. This segmentation eliminates the need for complex pivoting and rotation mechanisms while achieving the same adaptability.
4Length of moving object
If the inner tamping unit is mounted on the same guides as the outer unit, then both units can move independently with sufficient displacement, but the vertical stiffness and torsional stiffness must be significantly increased
Solution Approach 1:
The guide orientation is changed from horizontal to vertical. This dimensional change simultaneously provides the necessary independent displacement capability for both tamping units and inherently increases the vertical stiffness and torsional stiffness of the guide system, eliminating the need for additional reinforcement.
Data Source
Figure 1~4
Figure 2
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AI summary
The invention relates to a tamping machine (22) for compacting the ballast bed of a track, said machine comprising at least two tamping units (37, 38, 41) for each side of the tamping machine, which units can be displaced transversely relative to the longitudinal direction of the tamping machine by means of a transversal displacement device. At least two guides, in particular motion bars or sliding tubes (2, 3) are associated with both tamping units (37, 38) of each side of the tamping machine, said guides being offset in relation to one another with respect to their height and in the longitudinal direction of the tamping machine. Each outer tamping unit (37) and its associated guides can be displaced transversely to the longitudinal direction of the tamping machine using an adjusting drive (21) and the inner tamping unit (38) can be displaced on the same guides, independently of the outer tamping unit (37), transversely to the longitudinal direction of the tamping machine using an adjusting drive (21).