Mainly based on drilling blasting method, the main processes include drilling blasting work, rock loading and lifting work, well support work, and auxiliary work such as ventilation, drainage and measurement.
Drilling blasting work accounts for about 20% to 30% of the total cycle time.
Most of the boreholes are pneumatic rock drills , such as the YT-23 light rock drill , and the YGZ-70 rail heavy duty rock drill. The latter needs to be drilled with an umbrella-shaped drill stand, and the depth of the eye is generally 3~5m.
The blasting work includes the selection of blasting equipment , the determination of blasting parameters and the preparation of blasting charts.
(1) Blasting equipment
In the construction of vertical shafts, water-resistant explosives are required. Commonly used water-resistant explosives are water-resistant rock ammonium nitrate explosives, water-gel explosives and nitrifying sweeteners. Water gel explosives are widely used.
Detonation equipment usually uses domestic second detonator, millisecond delay detonator and detonating cord.
When there is danger of explosion of methane and coal dust explosion wellbore or wellbore through the coal seam, the coal mine safety must be no more than an extension of explosives and electric detonators millisecond delay of 130ms.
The power of the shooting gun is mostly AC power supply or special detonator. When using AC power, the voltage should not exceed 380V.
(2) Blasting parameters
Including the depth of the blasthole, the number of blastholes, the consumption of explosives, and so on.
When using artificial hand-held drills, it is suitable for 1.5~2.0m; when using umbrella drills, it is suitable for 3.0~5.0m.
(3) Blasting chart
The blasting chart includes: blasting raw conditions, blasting parameters, blasthole layout and expected blasting effects.
Fiber Coupled LED
375nm to 940nm Multimode wavelength LED are designed for microscopy and other applications that require multiple color channels.The LED current of each channel can be adjusted independently or modulated via an external voltage.The multi-wavelength LED system offer a compact housing with a backlit, easy-to-read LCD display. They are operated via the buttons on the front panel.
â– UV, Visible, and NIR Versions (from 375nm to 1550nm)
â– The SMA connector is ideal for multimode fiber.
â– Multi-wavelength fiber coupled LED available.
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Data Sheet for Single Wavelength LED
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Model
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Color
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Nominal Wavelength (nm)
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Bandwidth FWHM (nm)
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Typical Φ600um Core Fiber Output Power SMA (mW)
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Maximum Current CW (mA)
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Forward Voltage (V)
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Typical Lifetime (h)
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LFM375
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UV
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375
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9
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3.0
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1400
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3.6
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~10000
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LFM395
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UV
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395
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16
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1.0
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500
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4.5
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~10000
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LFM405
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UV
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405
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12
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4.2
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1400
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3.45
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~10000
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LFM430
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Violet
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430
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15
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1.0
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500
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3.8
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~10000
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LFM460
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Royal Blue
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460
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25
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6.0
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1000
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3.6
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~10000
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LFM470
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Blue
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470
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25
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3.2
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1000
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3.2
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~10000
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LFM500
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Cyan
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500
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30
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2.2
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1000
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3.3
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~10000
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LFM530
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Green
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530
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33
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3.0
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1000
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3.2
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~10000
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LFM565
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Lime
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565
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104
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3.0
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1000
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3.1
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~10000
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LFM600
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Amber
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600
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15
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1.2
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1000
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2.6
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~10000
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LFM620
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Red
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620
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18
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5.5
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1000
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2.2
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~10000
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LFM625
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Red
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625
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17
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3.0
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1000
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2.2
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~10000
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LFM660
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Deep Red
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660
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20
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4.0
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1200
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2.6
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~10000
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LFM730
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Far Red
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730
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37
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1.5
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1000
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2.3
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~10000
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LFM808
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IR
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808
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25
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2.5
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500
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3.6
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~10000
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LFM850
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IR
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850
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30
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3.0
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1500
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3.85
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~10000
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LFM880
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IR
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880
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50
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1.0
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1000
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1.7
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~10000
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LFM940
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IR
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940
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37
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3.0
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1000
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2.75
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~10000
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LFM1050
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IR
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1050
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37
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2.0
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600
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1.4
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~10000
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LFM1550
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IR
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1550
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102
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1.0
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700
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1.1
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~10000
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Note:
1. The above testing data are only for reference, the actual spectrum of LED may change since the temperature or other parameters are different when operating the current.
2.The above data was tested by 600μm core diameter, 0.22 NA multimode fibers. Other core diameter fibers are available on request.
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Laser Head
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Power Supply
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64 (L) ×46.5 (W) ×30 (H) mm3
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114 (L) ×78 (W) ×71 (H) mm3
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Data Sheet for Multi-wavelength LED
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Parameters
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Indicators
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Available wavelength (nm)
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375-940
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Output mode
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Fiber output
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Fiber core diameter (μm)
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400, 600, 800, 1000
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Fiber connector
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SMA905
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Output power (mW)
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Related to fiber
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Power stability (rms, over 4 hours)
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<3%, <5%
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Operating mode
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CW, TTL or Analog on request
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Operating temperature (°C)
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10~35
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Dimensions
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192(L)*241(w)*139.9(H)mm3
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Input power
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12VDC 7A
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Cooling method
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By air
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Storage temperature (°C)
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-20~80
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Lifetime (hours)
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10000
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Fiber Specs
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Fiber Coupled Led,Fiber Coupled Blue Led,Fiber Coupled Led 1550,Single Mode Fiber Coupled Led
Changchun New Industries Optoelectronics Technology Co., Ltd. , https://www.cnioptics.com