Automatic Rail Drill Drive Train With Sprag Gear Retraction
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Solution Overview
Problem
Railroad track rail drills require manual operation for advancing and retracting the drill spindle, consuming user effort and time, and are often powered by hydraulic systems or combustion engines, which are inefficient in remote locations.
Innovation Solution
A railroad track rail drill with a single drive motor that rotates the drill spindle and advances/retracts it automatically, using a drive train with a common gear and a sprag gear to control direction changes, and a control circuit for fully automatic drilling cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single drive motor with automatic feed mechanism is used, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of spindle rotation and drill feed advancement into a single drive motor system. The motor's rotational output is transmitted through a drive train that simultaneously controls both the rotation of the drill spindle and the axial movement of the feed mechanism, eliminating the need for separate motors for each function.
Solution Approach 2:
The patent introduces a drive train as an intermediary mechanism between the single drive motor and the drill spindle/feed system. This drive train includes gear trains and feed mechanisms that convert the motor's rotational motion into both rotational motion of the spindle and axial motion of the feed, mediating the complex motion requirements from a single motor source.
2Adaptability or versatility
If rechargeable batteries are used instead of hydraulic power or combustion engines, then adaptability to remote locations is improved, but use of energy increases due to battery limitations
Solution Approach 1:
The patent employs periodic action by implementing an automatic drilling cycle that alternates between drilling forward motion and retracting motion. The single drive motor reverses direction periodically to first advance the drill spindle through the rail and then retract it, creating an efficient cyclic operation that optimizes battery power usage by eliminating idle periods and continuous one-directional operation.
3Device complexity
If manual operation is used for advancing and retracting drill spindle, then device complexity is reduced, but productivity decreases
Solution Approach 1:
The patent applies dynamics by making the drive train and feed mechanism movable and adjustable during operation. The feed mechanism can dynamically advance and retract the drill spindle automatically, and the drive train can adapt its gear ratios and transmission paths to optimize the drilling and retracting speeds, transforming a static manual system into a dynamic automatic system that improves productivity.
Data Source
AI summary
A rail drill drive train can include a common drive end between a single drive motor and a common gear. A speed train end can extend from the common gear to rotate the drill spindle. A feed train end can independently extend from the common gear to advance and retract the drill spindle. The speed train end can include a sprag gear so that, without unmeshing any gears, the drill spindle is not unnecessarily rotated in the reverse direction when the drive motor is reversed to retract the drill spindle. A rail drill control circuit and related sensors can enable automatic operation throughout the complete drilling cycle without any manual input from the user other than starting the cycle. Such a fully automatic drilling cycle can minimize overall cycle time to preserve battery life and can free the user to perform other tasks between drill moving and clamping operations.