Rotating Drum Safety Cable for Drilling Machine Carriage
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Solution Overview
Problem
Existing drilling machines lack an effective and removable fall prevention system for head-carrying carriages, as known safety devices become inoperable once activated and cannot be easily reset without repairing the driving system, posing risks of equipment damage and injury.
Innovation Solution
A fall prevention safety device featuring a safety cable wound around a rotating drum connected to the translation motor, maintaining tension and synchronizing with the driving cable, and an elastic compensator to ensure pre-tensioning and adjust for deviations, preventing the carriage from falling in case of driving cable breakage or coupling device faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety device with wedges constrained to the driving chain or cable is used to prevent carriage fall, then the carriage and head are protected from falling, but the safety device cannot be removed or reset once activated, requiring full repair of the driving system
Solution Approach 1:
The safety device transitions from a static locked state to a dynamic resettable state through the introduction of a rotating drum mechanism. The drum can rotate to wind or unwind the safety cable, allowing the carriage to be moved vertically during repair operations and then reset to its normal position, converting an irreversible safety lock into a controllable dynamic system
Solution Approach 2:
The rotating drum acts as an intermediary mechanism between the safety cable and the carriage. It provides a controlled interface that allows the safety cable to maintain tension while enabling the carriage to be moved for repairs, and subsequently reset to its original position once repairs are complete
2Reliability
If the driving chain or cable breaks or detaches, then the carriage and head fall causing equipment damage and safety risks, but traditional safety devices become inoperable after activation and cannot facilitate repair operations
Solution Approach 1:
The rotating drum mechanism enables dynamic control of the safety cable tension, allowing the carriage to be moved to accessible positions during repair operations while maintaining safety. The drum can be rotated to release tension temporarily for repair access, then re-tensioned to secure the carriage
Solution Approach 2:
The safety device itself facilitates the repair process by providing controlled movement capability. The rotating drum allows operators to manually or mechanically move the carriage to repair positions and then reset it, making the safety system self-sufficient for both protection and repair facilitation
3Reliability
If the drum is mechanically connected to the translation motor and rotates according to carriage translation, then the safety cable remains constantly tight and synchronized with driving cable movement, but the device complexity increases
Solution Approach 1:
The drum is merged with the existing translation motor assembly, sharing the same rotational axis and mechanical connection. This integration allows the safety cable tension to be maintained through the existing motor's rotational movement, eliminating the need for a separate dedicated motor or power source for the safety mechanism
Solution Approach 2:
The translation motor serves dual functions: it drives the driving cable for normal carriage operation and simultaneously rotates the drum to maintain safety cable tension. This multi-functionality reduces the need for additional components and simplifies the overall system architecture
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 safety device effectively prevents the head-carrying carriage from falling by maintaining tension in the safety cable, allowing for synchronized movement and facilitating emergency and repair operations by enabling carriage translation during system failures.
Implementation Method 1
said drum is mechanically connected to said motor of the drilling machine, so that it rotates according to the translation of said head-carrying carriage, in such a way as to maintain said safety cable constantly tight
Implementation Method 2
said safety cable is furthermore constrained to said head-carrying carriage through at least one elastic means, hereinafter referred to as compensator, which is suited to compensate for any deviations in the drum-pinion synchrony
Implementation Method 3
When the driving cable is no longer tight for any reason, for example due to the breakage of the main driving chain or cable itself or due to faults/anomalies on the coupling device, said safety cable remains tight and holds the head-carrying carriage, thus preventing it from falling down
Data Source
Figure 1a~1
Figure 2~3
Figure 4~5
AI summary
Fall prevention safety device (D) for the head-carrying carriage (C) of drilling machines, comprising a safety cable (F) constrained between said carriage (C) and a rotating drum (T) suitable for winding said safety cable (F). Said drum (T) rotates according to the translation of said head-carrying carriage (C) in such a way as to maintain said safety cable (F) constantly tight, so that when said drive chain is no longer tight said safety cable (F) holds said carriage (C) and prevents it from falling down.