Product Overview
The mining anchor plate is an essential component of the rock bolt support system, serving as a load-bearing metal plate installed at the exposed end of the rock bolt, pressed firmly against the rock surface. The mining anchor plate is primarily manufactured from Q235 carbon structural steel, and can also be produced from high-strength steel or ductile iron (such as QT450-10 grade) according to customer requirements. Mining anchor plates are widely used in underground roadway support in coal mines, gold mines, iron mines, and other mining operations, making them a critical component for ensuring mining safety.
Product Functions
The mining anchor plate plays a key role in load bearing and load transfer within the rock bolt support system, with specific functions as follows:
Transferring Pre-tensioning Force: Transmits the thrust generated by the tightening torque of the nut to the roof and sidewalls of the roadway, enabling the rock bolt to generate initial anchoring force and achieving active support.
Transferring Working Resistance: Transfers the pressure from the roadway roof and sidewalls to the rock bolt, jointly reinforcing the surrounding rock and effectively preventing displacement and deformation of the roadway roof and sidewalls.
Load Distribution: Evenly distributes the tensile force from the rock bolt or anchor cable over a larger area of the rock surface, preventing the nut from crushing the rock wall and avoiding bolt perforation failure caused by insufficient bearing plate strength.
Protecting the Rock Surface: Supports the wire mesh and presses firmly against the rock surface, preventing rock fall, rib spalling, and roof collapse accidents.
In an underground support system, the rock bolt and anchor cable serve as the “skeleton,” while the mining anchor plate acts as the “foundation,” “base,” and “load-bearing plate,” making it an indispensable part of the entire support structure.
Product Types
Based on shape and functional characteristics, mining anchor plates are primarily classified into the following types:
Butterfly Plate: Features a special shape design with an arch height not less than 1/3 of the base diameter. Its load-bearing capacity is superior to that of flat plates, making it the most commonly used type in mines.
Flat Plate: Simple in structure, suitable for applications with relatively low support pressure.
Square Plate: Square in shape, convenient for processing and installation.
Round Plate: Commonly used in applications requiring special support configurations.
Domed Plate: Features a spherical arched structure in the center, which better accommodates uneven rock surfaces and provides uniform stress distribution.
Additionally, based on the type of rock bolt used, mining anchor plates can be further classified into rock bolt bearing plates, anchor cable bearing plates, and W-type anchor cable bearing plates.
Manufacturing Process
Mining anchor plates are manufactured from high-quality national standard high-strength steel plates through the following process:
Material Selection: Selects national standard high-strength steel plates to ensure thickness and hardness meet underground support requirements.
Cutting and Blanking: Uses automatic cutting machines for precise dimensional accuracy.
Stamping Forming: Uses large presses for one-time stamping and forming — butterfly, square, and domed plates are all produced through this process, ensuring standard curvature and uniform stress distribution.
Deburring and Edge Trimming: Removes burrs to prevent damage to wire mesh and injury to operators.
Anti-corrosion Treatment: Applies anti-corrosion treatment suitable for the humid underground environment, extending product service life.
Inspection and Packaging: Inspects each piece, binds them into bundles, and prepares them for shipment to various mining operations.
Common Specifications
The size specifications of mining anchor plates can be customized according to customer requirements. Common specifications include (side length × side length × thickness):
Dimensions: 120×120 mm, 140×140 mm, 150×150 mm, etc.
Thickness: 6 mm, 8 mm, 10 mm, 12 mm, etc.
Material: Q235 carbon structural steel (standard), high-strength steel plate, ductile iron (QT450-10)
Applicable Standards: National standard for coal mine anchor plates and national standard for iron mine anchor plates; custom manufacturing based on non-standard drawings is also available.
Thickness tolerance ranges: 5.5–6 mm, 7.5–8 mm, 9.5–10 mm, 11.5–12 mm.
Key Performance Features
Mining anchor plates offer the following outstanding performance advantages:
High Load-Bearing Capacity: Manufactured from high-strength plate materials with load-bearing capacity matched to the strength of the rock bolt shank, preventing perforation failure due to insufficient strength.
Optimized Force Distribution: Special shape design ensures more reasonable and uniform stress distribution, with the butterfly plate offering superior load-bearing capacity compared to flat plates.
Lightweight and Easy to Install: Compact structure with moderate weight, facilitating underground transportation and installation operations.
Effective Surface Control: Effectively improves control over the surrounding rock surface, preventing rock deformation.
Good Corrosion Resistance: Anti-corrosion treatment makes the product suitable for humid and harsh underground environments, providing long service life.
Installation Key Points
To ensure optimal support performance of the mining anchor plate, the following installation points should be observed:
Drill the bolt hole according to design requirements and blow out the rock powder from the hole.
Insert the anchoring agent, stir until it solidifies, and secure the rock bolt firmly in place.
Thread the mining anchor plate onto the rock bolt shank — the plate must be firmly pressed against the rock surface, without any gap or tilt.
Tighten the nut to achieve the specified pre-tensioning force.
Conduct a final inspection — the plate must not be warped, tilted, or suspended; only then is the installation qualified.
Precautions for Use
Based on practical experience from underground operations, the following precautions must be strictly observed:
The mining anchor plate must be pressed firmly against the rock surface — gaps or padding are strictly prohibited.
Plates that are deformed, cracked, or severely corroded must never be used.
The size and thickness of the mining anchor plate must match the strength of the rock bolt or anchor cable — “a small horse pulling a large cart” is strictly prohibited.
In fractured rock zones, enlarged and thickened plates must be used together with metal wire mesh.
Nut tightening torque must be appropriate — too loose provides no support, too tight may crush the plate.
Regular underground inspections must be conducted — replace any loose or deformed plates promptly.
Main Application Areas
Mining anchor plates are widely used in the following fields:
Roof and rib support in underground coal mine roadways
Roadway support in metal mines such as gold mines and iron mines
Surrounding rock reinforcement in tunnel engineering
Support reinforcement in various underground chambers and intersections
Particularly suitable for applications with high support pressure requiring high load-bearing capacity
Supporting Products
Mining anchor plates are typically used in conjunction with the following products, collectively forming a complete underground support system: rock bolts (including round steel twist bolts, left-hand thread bolts, right-hand thread bolts, etc.), anchor cables, metal wire mesh (diamond mesh, welded wire mesh), W-straps, steel guard plates, spherical washers, anchoring agents, and mining nuts.
