Gear Backlash Adjustment Mechanism for Drill Rigs
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Solution Overview
Problem
Blasthole drill rigs face inefficiencies due to wear in the toothed surfaces and gap plates of the driving mechanism, leading to gear backlash and reduced contact between the drill pipe and drill tower, which compromises the drilling process.
Innovation Solution
An adjustment mechanism with rollers and torque arms is introduced, allowing for simultaneous movement of the rollers to maintain contact between the rack and pinions, preventing gear backlash and ensuring continuous engagement by adjusting the position of the rollers relative to the pinions, thereby maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill rig operates continuously, then productivity increases, but wear in the toothed surfaces and gap plates leads to gear backlash
Solution Approach 1:
The adjustment mechanism allows dynamic adjustment of the gap plate position to compensate for wear. The gap plate can be moved axially along the rack to maintain proper engagement with the pinion, transforming a static component into a dynamically adjustable one that adapts to wear over time while maintaining reliable gear engagement.
Solution Approach 2:
The invention changes the position parameter of the gap plate along the rack axis. By adjusting the axial position of the gap plate relative to the pinion, the system compensates for wear-induced backlash while maintaining continuous operation and productivity.
2Reliability
If the gap between pinions and rack is increased to accommodate wear, then reliability improves, but gear backlash increases and contact is lost
Solution Approach 1:
The gap plate is designed with dynamic adjustment capability, allowing its position to be modified as wear occurs. This prevents the need to initially design with excessive clearance, as the system can adapt to maintain optimal engagement without generating backlash.
Solution Approach 2:
The adjustment mechanism enables the system to self-correct for wear by allowing operators to reposition the gap plate and rollers, maintaining proper gear engagement without requiring replacement of worn components or complete system disassembly.
3Manufacturing precision
If separate adjustment mechanisms are used for each pinion, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The invention merges multiple adjustment functions into a single integrated mechanism. The coupling member connects multiple torque arms and rollers, allowing simultaneous adjustment of multiple pinions through a single operation, thereby reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The coupling member serves multiple functions: it connects torque arms, transmits adjustment force to multiple rollers, and enables coordinated movement of multiple pinions. This multi-functional component reduces the overall number of parts needed while achieving precise individual pinion alignment.
4Reliability
If the adjustment mechanism is added, then gear backlash is prevented, but device complexity increases
Solution Approach 1:
The adjustment mechanism introduces dynamic adjustability to an otherwise static gear system. By allowing movement of the gap plate and rollers along the rack, the system can compensate for wear and maintain reliable engagement without requiring a complete redesign of the driving mechanism.
Solution Approach 2:
The gap plate acts as an intermediary component between the pinions and the rack. It mediates the engagement relationship, allowing for adjustment and compensation of wear while maintaining the primary rack-and-pinion driving mechanism intact.
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 adjustment mechanism effectively maintains a tight contact between the toothed surfaces, enhancing the drilling efficiency by preventing gear backlash and allowing for fine-tuning of the roller position, reducing downtime and maintaining performance despite wear.
Implementation Method 1
a first threaded rod extending from the coupling member on one side of the coupling member, a second threaded rod extending from the coupling member on an opposite side of the coupling member
Implementation Method 2
a first eccentric shaft coupled to the first torque arm, a second eccentric shaft coupled to the second torque arm
Data Source
AI summary
A drill rig includes a base, a drill tower extending from the base, a drill pipe coupled to and supported by the drill tower, and a driving mechanism coupled to the drill tower that moves the drill pipe relative to the drill tower. The driving mechanism includes a rack and a plurality of pinions that engage the rack. The drill rig also includes an adjustment mechanism coupled to the driving mechanism, the adjustment mechanism including a plurality of rollers and an adjustment component that moves the plurality of rollers simultaneously toward the pinions to contact the rack.