Flameproof Electric Cable Bolt Tensioner
Grid Power for High-Capacity Faces
Large mines and tunnel projects with reliable grid access need tensioning that keeps pace with the bolting cycle. The Flameproof Electric Cable Bolt Tensioner pairs a mining-specific explosion-proof motor with an electric hydraulic pump rated at 3.0 L/min, converting electrical energy into high-pressure hydraulic output at a constant rated flow. The setup is aimed at high-capacity faces where bolting cycle time sets the advance rate.
Explosion Protection and Flow
Feature 1: The motor carries an ExdI Mb explosion-proof rating. The motor housing is designed to contain internal explosion pressure and prevent flame propagation, allowing use in gassy mechanized chambers and main haulage roadways. [Certification standard to be stated, e.g. GB 3836 series / IEC 60079.]
Feature 2: Rated flow is 3.0 L/min, compared with 1.5 L/min for the standard pneumatic pump used in the same class of tool. The higher flow shortens each tensioning cycle compared with lower-flow pumps.
Feature 3: For export projects, motor and control components can be configured for 220 V, 380 V, 400 V, 415 V or 440 V at 50 Hz or 60 Hz, alongside the standard 660 V / 1140 V mining configuration.
Product Specifications
|
Parameter |
Specification |
|
Pump Model |
DYB-3.0/63 |
|
Rated Flow Rate |
3.0 L/min |
|
Motor Explosion-Proof Grade |
ExdI Mb |
|
Applicable Voltage |
660 V / 1140 V (standard); 220–440 V, 50/60 Hz (export, customizable) |
|
Rated Hydraulic Pressure |
63 MPa |
|
Motor Power |
3 kW |
|
Oil Tank Capacity |
15 L (customizable: 10 L / 20 L / 30 L) |
|
Pump Noise |
≤85 dB |
|
Pump Weight |
58 kg |
|
Applicable Cable Diameter |
15.24 mm – 35 mm |
|
Rated Tensioning Force |
200 kN – 700 kN (varies by model) |
Jack models available (MD series): MD15-200/63 (200 kN, 15 kg), MD18-300/63 and MD19-300/63 (300 kN, 18 kg), MD22-400/63 (400 kN, 20 kg), MD22-500/63 (500 kN, 24 kg), MD29-600/63 and MD32-600/63 (600 kN, 26 kg), MD35-700/63 (700 kN, 29 kg).
Typical Work Environments
In large coal mines with extensive power networks, the unit handles high volumes of tensioning across main production faces. Subway and highway tunnel projects with grid power at the portals use it for rapid initial support. Underground powerhouses at hydropower stations deploy it for heavy prestressed anchor cables requiring long, high-frequency tensioning.
Contamination Resistance, Testing and Delivery
The plunger pump uses a dedicated fluid distribution structure intended to limit the effect of abrasive dust; pump noise is ≤85 dB. Every unit is full-load and linkage tested (test pressure, duration and linkage items to be confirmed) before dispatch. Standard models ship from stock within one to two days with a full inspection report. Units are packed in solid wood crates with quick-release buckles, components individually bubble-wrapped.
Procurement Inquiries
Q1: What power supply is needed underground?
A2: The site must provide AC power matching the motor nameplate (e.g. 660 V or 1140 V), with flameproof cables and junction boxes to match. Confirm reliable grounding before operation and never disconnect wiring while the circuit is live.
Q2: How are voltage differences handled on export orders?
A2r: Tell us the destination country's voltage and frequency at the time of ordering. Motor and control components are then configured to the local grid standard.
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