Roof Bolter Product
Overview
A roof bolter is the machine that keeps an underground mine from caving in. Behind a continuous miner, the freshly cut roof is unsupported; the bolter drills holes up into it and installs steel bolts with bearing plates that clamp the rock layers together so they span like a beam instead of falling in slabs. It is one of the most safety-critical machines underground, and the rule of work is strict: the operator stays under already-supported roof while the machine reaches forward to support the new ground.
The drilling end is the Drill Boom & Feed and Rotary Drill Head: a boom that aims the drill at the roof and a rotary head that spins the steel while a hydraulic feed pushes it up. The support end is the Temporary Roof Support — an automated temporary roof support (ATRS) that presses a canopy against the new roof to protect the work area until the permanent bolts are set.
How it works
To drill, the Drill Boom & Feed positions the Feed Frame against the roof, and the Feed Motor drives a chain that advances the Rotary Drill Head. The head's Drill Rotation Motor turns the spindle through a sealed gearbox and chuck, spinning a hollow Drill Steel & Bit tipped with a carbide bit. Cuttings are cleared through the centre of the steel — drawn off by the Dust Collector, whose vacuum fan and filter capture the respirable silica dust that is a serious health hazard when drilling dry.
Once a hole is drilled, a resin or mechanical bolt is inserted and tensioned, pinning the strata. Every cylinder on the machine — boom positioning, feed thrust, and the Temporary Roof Support props — is fed by the Hydraulic Power Pack, a motor-driven hydraulic pump and valve bank. The machine moves itself between bolting stations on the Chassis & Tramming, a low-profile carrier driven by tram motors through reduction gearing to the Wheel Assembly sets. The operator runs drilling, bolting and tramming from the Control System, a panel of valve controls, interlocks and a display, with the 12 V Battery holding up control power.
Build & assembly graph
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Bill of materials
8 top-level lines · 76 rows shown · 238 parts total · indented to 3 levels| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Drill Boom & Feed 5 parts | rb-drill-boom | 1× | 1 | 33 | assembly |
| 1.1 | Boom Structure | rb-boom-structure | 1× | 1 | — | part |
| 1.2 | Feed Frame | rb-feed-frame | 1× | 1 | — | part |
| 1.3 | Feed Chain | rb-feed-chain | 1× | 1 | — | part |
| 1.4 | Feed Motor 5 parts | rb-feed-motor | 1× | 1 | 26 | assembly |
| 1.4.1 | Stator Assembly 3 parts + deeper › | stator-assembly | 1× | 1 | 3 | assembly |
| 1.4.2 | Rotor Assembly 4 parts + deeper › | rotor-assembly | 1× | 1 | 19 | assembly |
| 1.4.3 | Motor Housing | motor-housing | 1× | 1 | — | part |
| 1.4.4 | Ball Bearing | ball-bearing | 2× | 2 | — | part |
| 1.4.5 | Oil Seal | oil-seal | 1× | 1 | — | part |
| 1.5 | Boom Cylinder 2 parts | rb-boom-cylinder | 2× | 2 | 2 | assembly |
| 1.5.1 | Cylinder Barrel & Rod | rb-cylinder-barrel | 1× | 2 | — | part |
| 1.5.2 | O-Ring Set | oring-set | 1× | 2 | — | part |
| 2 | Rotary Drill Head 5 parts | rb-drill-head | 1× | 1 | 40 | assembly |
| 2.1 | Drill Rotation Motor 6 parts | rb-drill-motor | 1× | 1 | 27 | assembly |
| 2.1.1 | Stator Assembly 3 parts + deeper › | stator-assembly | 1× | 1 | 3 | assembly |
| 2.1.2 | Rotor Assembly 4 parts + deeper › | rotor-assembly | 1× | 1 | 19 | assembly |
| 2.1.3 | Copper Winding | copper-winding | 1× | 1 | — | part |
| 2.1.4 | Motor Housing | motor-housing | 1× | 1 | — | part |
| 2.1.5 | Ball Bearing | ball-bearing | 2× | 2 | — | part |
| 2.1.6 | Oil Seal | oil-seal | 1× | 1 | — | part |
| 2.2 | Drill Head Gearbox 4 parts | rb-head-gearbox | 1× | 1 | 8 | assembly |
| 2.2.1 | Gearbox Housing | gearbox-housing | 1× | 1 | — | part |
| 2.2.2 | Helical Gear Pair | gear-pair | 2× | 2 | — | part |
| 2.2.3 | Ball Bearing | ball-bearing | 3× | 3 | — | part |
| 2.2.4 | Oil Seal | oil-seal | 2× | 2 | — | part |
| 2.3 | Drill Chuck | rb-drill-chuck | 1× | 1 | — | part |
| 2.4 | Drill Steel & Bit | rb-drill-steel | 1× | 1 | — | part |
| 2.5 | Ball Bearing | ball-bearing | 3× | 3 | — | part |
| 3 | Hydraulic Power Pack 5 parts | rb-power-pack | 1× | 1 | 33 | assembly |
| 3.1 | Pump Drive Motor 5 parts | rb-pump-motor | 1× | 1 | 26 | assembly |
| 3.1.1 | Stator Assembly 3 parts + deeper › | stator-assembly | 1× | 1 | 3 | assembly |
| 3.1.2 | Rotor Assembly 4 parts + deeper › | rotor-assembly | 1× | 1 | 19 | assembly |
| 3.1.3 | Motor Housing | motor-housing | 1× | 1 | — | part |
| 3.1.4 | Ball Bearing | ball-bearing | 2× | 2 | — | part |
| 3.1.5 | Oil Seal | oil-seal | 1× | 1 | — | part |
| 3.2 | Hydraulic Pump | rb-hydraulic-pump | 1× | 1 | — | part |
| 3.3 | Valve Bank | rb-valve-bank | 1× | 1 | — | part |
| 3.4 | Hydraulic Reservoir | rb-hydraulic-tank | 1× | 1 | — | part |
| 3.5 | Relay | relay | 4× | 4 | — | part |
| 4 | Temporary Roof Support 3 parts | rb-temporary-support | 1× | 1 | 7 | assembly |
| 4.1 | Support Canopy | rb-support-canopy | 1× | 1 | — | part |
| 4.2 | Boom Cylinder 2 parts | rb-boom-cylinder | 2× | 2 | 2 | assembly |
| 4.2.1 | Cylinder Barrel & Rod | rb-cylinder-barrel | 1× | 2 | — | part |
| 4.2.2 | O-Ring Set | oring-set | 1× | 2 | — | part |
| 4.3 | Roof Contact Pad | rb-support-pad | 2× | 2 | — | part |
| 5 | Chassis & Tramming 4 parts | rb-chassis | 1× | 1 | 103 | assembly |
| 5.1 | Main Frame | rb-main-frame | 1× | 1 | — | part |
| 5.2 | Feed Motor 5 parts | rb-feed-motor | 2× | 2 | 26 | assembly |
| 5.2.1 | Stator Assembly 3 parts + deeper › | stator-assembly | 1× | 2 | 3 | assembly |
| 5.2.2 | Rotor Assembly 4 parts + deeper › | rotor-assembly | 1× | 2 | 19 | assembly |
| 5.2.3 | Motor Housing | motor-housing | 1× | 2 | — | part |
| 5.2.4 | Ball Bearing | ball-bearing | 2× | 4 | — | part |
| 5.2.5 | Oil Seal | oil-seal | 1× | 2 | — | part |
| 5.3 | Tram Gearbox 4 parts | rb-tram-gearbox | 2× | 2 | 7 | assembly |
| 5.3.1 | Gearbox Housing | gearbox-housing | 1× | 2 | — | part |
| 5.3.2 | Helical Gear Pair | gear-pair | 2× | 4 | — | part |
| 5.3.3 | Ball Bearing | ball-bearing | 3× | 6 | — | part |
| 5.3.4 | Oil Seal | oil-seal | 1× | 2 | — | part |
| 5.4 | Wheel Assembly 5 parts | wheel-assembly | 4× | 4 | 9 | assembly |
| 5.4.1 | Alloy Wheel | alloy-wheel | 1× | 4 | — | part |
| 5.4.2 | Tire | tire | 1× | 4 | — | part |
| 5.4.3 | TPMS Sensor | tpms-sensor | 1× | 4 | — | part |
| 5.4.4 | Lug Nut | lug-nut | 5× | 20 | — | part |
| 5.4.5 | Valve Stem | valve-stem | 1× | 4 | — | part |
| 6 | Dust Collector 3 parts | rb-dust-collector | 1× | 1 | 3 | assembly |
| 6.1 | Vacuum Fan | rb-dust-fan | 1× | 1 | — | part |
| 6.2 | Filter Cartridge | rb-dust-filter | 1× | 1 | — | part |
| 6.3 | Dust Canister | rb-dust-canister | 1× | 1 | — | part |
| 7 | Control System 5 parts | rb-control-system | 1× | 1 | 18 | assembly |
| 7.1 | Bare PCB | pcb-bare | 2× | 2 | — | part |
| 7.2 | Microcontroller | mcu | 1× | 1 | — | part |
| 7.3 | LCD Panel | lcd-panel | 1× | 1 | — | part |
| 7.4 | Relay | relay | 6× | 6 | — | part |
| 7.5 | Connector | connector | 8× | 8 | — | part |
| 8 | 12 V Battery | lv-battery | 1× | 1 | — | part |
Sourcing — likely vendors
Companies that make this · indicative price $200k–$5M · MOQ & lead are typical| Vendor | HQ | Specialty | MOQ | Lead time |
|---|---|---|---|---|
| caterpillar.com ↗ | Irving, US | Construction & mining equipment | made to order | 20–36 wks |
| 🇯🇵Komatsu komatsu.com ↗ | Tokyo, JP | Construction & mining equipment | made to order | 20–36 wks |
| 🇸🇪Sandvik rocktechnology.sandvik ↗ | Stockholm, SE | Mining & rock technology | made to order | 20–36 wks |
| 🇸🇪Epiroc epiroc.com ↗ | Stockholm, SE | Mining & drilling equipment | made to order | 20–36 wks |
| 🇫🇮Metso metso.com ↗ | Helsinki, FI | Crushing & minerals processing | made to order | 20–36 wks |
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