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The modular design of single-arm and double-curve-arm rock drilling rigs enhances maintenance convenience.
Release time:
2026-10-02
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Summary:
As a core piece of equipment for tunneling and mining excavation, rock‑drilling rigs operate continuously under harsh conditions—exposure to dust, vibration, and high humidity—making wear and failure of components inevitable. In conventional monolithic designs, when a single component requires maintenance, the entire machine often has to be disassembled or extensively dismantled, resulting in lengthy repair times and high costs. By contrast, modular design divides the machine into several functionally independent modules, significantly enhancing the ease of maintenance.
I. Module Division: The Foundation of Maintenance Through Decomposition into Smaller Parts
The core of modular design lies in decomposing the entire vehicle into several independent, easily assembled and disassembled module units based on function. The CMJ‑17 rock‑drilling rig adopts a modular architecture, allowing it to be broken down into four separate modules: the undercarriage, the left and right drilling booms, the power unit, and the rock‑drilling mechanism, thereby facilitating convenient assembly and disassembly. Similarly, the Blue Ocean Intelligent CYTJ45 single‑boom rock‑drilling rig employs a full‑machine modular design, enabling rapid disassembly into four functional modules. After disassembly, the largest module measures 1,960 mm in length, 1,300 mm in width, and 1,980 mm in height, meeting the dimensional constraints of cage‑based underground transport in mines and supporting quick assembly and disassembly for underground relocation.
This modular design enables maintenance personnel to quickly isolate the faulty module without having to systematically inspect every component of the entire vehicle. When a rock‑drilling mechanism malfunctions, technicians can address only the drill‑unit module, without needing to intervene in the undercarriage or the powertrain—and vice versa. The clear physical boundaries between modules and their well‑defined functional assignments fundamentally reduce the complexity of fault diagnosis.
In the design of its rock‑drilling rigs, China Railway Construction Heavy Industry has further adopted a modular architecture, eliminating centralized overhangs at the front end and significantly reducing the machine’s overall length and turning radius. This modular arrangement not only optimizes the machine’s layout but also provides ample access space for each module, enabling maintenance personnel to more easily reach components requiring servicing.
II. On-site Repair: Enhanced Efficiency Without the Need to Transport the Entire Unit
The most immediate maintenance advantage of modular design is the ability to perform “on‑site repairs.” In conventional monolithic structures, when a component inside the rear body requires servicing, the entire machine often has to be moved to a repair shop or extensively disassembled, which is both time‑consuming and labor‑intensive. The rear-body structure developed by Wuxin Tunnel Equipment divides the exterior panels into several detachable sections—front panel, roof panel, left side panel, right side panel, and rear panel. When a specific component within the rear body needs repair, only the corresponding panel needs to be removed, enabling on‑site servicing without requiring the entire machine to be relocated. This design significantly reduces the workload and duration of maintenance, accelerates construction schedules, and lowers costs.
In confined construction environments such as underground mines or tunnels, relocating the entire machine often requires coordinating transport equipment, occupying transportation corridors, and disrupting other work processes, resulting in high costs. The ability to perform on-site maintenance enables most repair tasks to be completed directly at the working face, eliminating the time and expense associated with transporting equipment back and forth, which is of practical significance for ensuring project progress.
III. Quick-Change Interface: Reduced Module Replacement Time
Modular design not only facilitates maintenance but also enables “whole‑module replacement.” When it becomes necessary to replace a rock‑drilling boom or critical working components, the modular interface significantly simplifies the replacement process. In one design of a three‑boom rock‑drilling rig that is easy to service, all three booms can be rapidly detached and reinstalled when a replacement is required, allowing for swift component changes. The replaceable rock‑drilling work unit on a single boom assembly can be swapped in under 10 minutes, with no need to recalibrate parameters afterward.
The core value of the quick‑change interface lies in transforming “repair” into “replacement”: when a module suffers a severe failure, maintenance personnel can simply remove the faulty unit and install a spare, restoring equipment operation while the failed module is repaired at leisure in the workshop. This approach reduces equipment downtime from several days to just a few tens of minutes, which is especially critical for tunneling and mining projects with tight schedules.
Sandvik’s tunnel drilling rig rock‑drilling‑machine upgrade solution likewise embodies a modular approach: each upgrade kit includes a brand‑new RD‑series drill and all the necessary ancillary components, with the drill mounted to the chassis using just six bolts. Thanks to a new design philosophy that minimizes pressurized joints between functional modules, reliability has been enhanced, and maintenance intervals have been extended to 750 hours of impact‑drilling operation. Excellent serviceability is achieved through a modular architecture and visual wear indicators; these indicators on critical components enable operators to readily assess machine condition during operation, determining wear levels without disassembly.
IV. Modular Configuration: Rapid Adaptation to Diverse Operating Conditions
Modular design not only facilitates maintenance but also enables rapid transitions between different construction conditions. CRRC Heavy Industry’s modular drilling rig chassis system allows users to select and combine six distinct machine models based on specific operational requirements, offering exceptional versatility. This modular approach makes it even easier to switch between different chassis configurations. The Blue Ocean Intelligent CYTJ45 single-arm drilling rig features both local and wireless remote‑control operation; when the wireless signal is weak, the remote automatically hops frequencies to avoid interference. Meanwhile, the small‑section tunneling rig’s chassis adopts a modular design, enabling disassembly above ground and assembly underground, with convenient loading and unloading via cage systems.
In the field of automated control systems for rock‑drilling rigs, modular hardware and software design, distributed control, and three‑dimensional graphical visualization have emerged as key directions for future development. Modular design enables the control system to flexibly configure functional modules according to specific requirements, and during maintenance, only the corresponding control module needs to be replaced to restore system functionality.
V. Comprehensive Demonstration of Economic Benefits
The enhanced maintainability afforded by modular design ultimately translates into economic benefits. On the one hand, reduced maintenance time directly mitigates production losses caused by equipment downtime; on the other, on-site repairs cut transportation and coordination costs associated with relocating equipment. Furthermore, modular design enables more precise spare-parts management—requiring only key modules rather than complete units, thereby keeping inventory costs under control.
The ZYS123AG-FL fully computerized three-boom rock‑drilling rig from China Railway Construction Heavy Industry has demonstrated a low equipment failure rate in plateau railway construction, achieving an excavation advance of over 3.2 meters per shift and completing drilling operations in approximately 2.5 hours. The combination of this low failure rate and the rapid maintenance capabilities enabled by its modular design ensures the rig’s sustained operational performance even under harsh working conditions.
The modular design of single-arm and double-curve‑arm rock drilling rigs enhances maintenance convenience across multiple dimensions—through functional module partitioning, on‑site serviceability, quick‑change interface design, and flexible module configuration. This design philosophy shifts the rigs from a “whole‑unit repair” approach to a “module‑replacement” paradigm, thereby reducing downtime caused by failures, lowering maintenance costs, and providing reliable equipment support for continuous tunneling and mining operations.
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