Bolt Mixer
Also known as: Bolt mixing sleeve, drive socket; a supporting tool for mining roof bolt support, manufactured according to standard mining drilling tool processes.
- Product Introduction
Also known as: Bolt mixing sleeve, drive socket; a supporting tool for mining roof bolt support, manufactured according to standard mining drilling tool processes. Material: primarily 40Cr / 42CrMo alloy steel, integrally forged, quenched and tempered, with a black oxide anti-rust finish.
Compatible equipment: Pneumatic roof bolters, hydraulic roof bolters, on-board drilling boxes of bolter-miners; common drive interfaces: B19 and B22 hexagons.
Function: Engages the bolt tail, transmits drill torque, and mixes resin cartridges; simultaneously drives the nut for tightening upon completion of mixing, enabling one-pass bolt installation.
Applications
Used for installing metal resin bolts in coal roadways, semi-coal/rock roadways, and rock roadways in underground coal mines.
1. Standard short type: Suitable when there is no obstruction at the borehole collar - trays, steel straps, and metal mesh do not interfere.
2. Extended-length type: Used when steel straps, metal mesh, or thick trays obstruct the collar, preventing the drill head from reaching the bolt.
⚠️ Note: Standard bolt mixers must not be used on fiberglass bolts. Fiberglass bolts require dedicated fiberglass bolt mixing sockets.
Structure
Drive hexagonal end
B19/B22 external hexagon with a pin hole; inserts into the drill output shaft and uses a retaining pin to transmit torque.
Barrel
Standard barrel / extended barrel (70–120mm extension); side walls have overflow/observation holes to discharge excess resin slurry and prevent internal clogging.
Internal cavity
Hexagonal socket that fits over the hexagonal head of the bolt tail, grips the bolt shank, and can drive the nut for rotation and pre-tensioning.
Common Specifications
| Model | Drive Interface | Compatible Bolt Diameter | Version |
| HSJBG‑16 | B19/B22 | Φ16 | Standard / Extended‑L |
| HSJBG‑18 | B19/B22 | Φ18 | Standard / Extended‑L |
| HSJBG‑20 | B19/B22 | Φ20 | Standard / Extended‑L |
Suffix "‑L" indicates extended-length type; suffix "‑J" indicates heavy-duty on-board type for roadheaders.
Standard vs. Extended-Length vs. Roadheader-Mounted Types
| Item | Standard Bolt Mixer | Extended-Length Bolt Mixer | Roadheader-Mounted Bolt Mixer |
| Barrel length | Standard short barrel | Extended by 70–120mm | Standard / Extended with thicker wall |
| Supporting equipment | Hand-held pneumatic roof bolter | Hand-held pneumatic roof bolter | Bolter-miner hydraulic drilling box |
| Application conditions | No mesh/strap interference | Steel straps, mesh, large trays interference | On-board high-torque continuous operation |
| Torsional performance | Conventional | Reduced due to longer cantilever | Highest strength, withstands high torque |
Advantages
Integral forged and tempered construction transmits mixing torque; resin mixing and nut pre-tensioning are completed in one operation for high efficiency.
Overflow holes prevent resin from jamming the socket; easy to install and remove.
Universal interface allows direct interchangeability with B19/B22 underground drills.
Extended-length models resolve interference from support components, ensuring the bolt is mixed to the proper depth.
Precautions
For metal bolts only - prohibited for use on fiberglass bolts. Fiberglass bolts have low thread strength; gripping the nut will crack the bolt tail.
Size selection must match the hexagonal flats of the bolt tail. Mismatching causes slipping or damage to the bolt.
For extended-length types, choose the shortest extension that can clear obstructions to reduce the risk of torsional fracture.
Mixing time: 20–35 seconds for standard resin. Keep the drill pressed forward during mixing. After mixing, wait for the resin to reach initial set before reversing to remove the mixer. Premature reversal is strictly prohibited as it causes anchorage failure.
For on-board bolter-miner equipment, always use the ‑J heavy-duty type. Standard hand-held mixers cannot withstand the high torque of hydraulic drilling boxes and are prone to fracture.
Pre-operation inspection: check for barrel cracks, hexagonal wear/rounding, and internal cavity scoring. Discard immediately if any damage is found.
Bolt Mixer vs. Cable Mixer
| Item | Bolt Mixer | Cable Mixer |
| Gripping object | Hexagonal head of bolt tail | Cable anchor (ring/barrel) |
| Applicable item | Rebar bolts | Steel strand cables |
| Internal cavity shape | Hexagonal | Shaped cavity for anchor profile |
| Interchangeability | Not interchangeable | Not interchangeable |
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