The coal firmness coefficient includes the firmness coefficient, crushing index, strength index, and bonding index. These are important parameters for determining the physical and mechanical properties of coal, making the measurement of the coal firmness coefficient crucial. To study the coal firmness coefficient, we first use a grinder to obtain samples of the same specifications as much as possible to measure the firmness coefficient, crushing index, strength index, and bonding index. Specifically, the firmness coefficient is measured using a thermal adsorption instrument; the crushing index is measured using a crushing instrument; the strength index is measured using the sand drop rate test stone compression method; and the bonding index is measured using a bonding test block.
MJC Coal Firmness Coefficient Testing Device Product Introduction: Used to measure the physical and mechanical properties (strength f) of coal, which is one of the important indicators for determining the risk of outbursts in coal mining areas. It meets the requirements of MT49-1987 "Method for Determining the Firmness Coefficient of Coal." MJC Coal Firmness Coefficient Testing Device Operating Environment: Operating temperature (°C): -5 to 35; Operating relative humidity (%): ≤90; Atmospheric pressure (kPa): 80 to 110. The firmness coefficient measurement for lignite, bituminous coal, and anthracite is conducted in an environment free from damaging metal insulation.

MJC Coal Firmness Coefficient Tester Performance Features
According to the "Standard Method for Determining the Firmness Coefficient of Coal" MT 49-1987, a limit device is set for the tamping hammer operating height of 600mm, reducing the lifting height error during experiments and improving testing accuracy; the product is entirely processed from alloy steel, with an exquisite appearance, sturdy and durable; the scale is made of copper material, ensuring smooth operation without mechanical resistance, and scientifically accurate test results;

MJC Coal Firmness Coefficient Tester Technical Parameters
Testing time: <1h
Tamping cylinder
Hammer operating height: 600mm, inner diameter φ76
Limit device error: ≤2mm
Electronic balance
Maximum range: 1000g, sensitivity 0.5g,
Stabilization time <3S, power 5W;
Standard hammer
Cylinder height: 90mm, diameter: 66mm
Weight: 2.4Kg
Lifting rope material: stainless steel wire rope
Measuring cylinder
Inner diameter: φ23mm
Piston scale length: 160mm
Piston scale accuracy: 1mm
Sample sieve and funnel
Round hole diameters: 20mm, 30mm, with base,
Round hole, square hole diameters: 1mm (square hole), 3mm (round hole), with base; square hole diameter: 0.5mm, with base; the funnel quickly loads coal samples with a particle size of less than 0.5mm into the measuring cylinder
Container: Can hold 50g of coal samples with a particle size of 20mm to 30mm

Zhengzhou Aidi produces MJC Coal Firmness Coefficient Testers, supplying coal drill cuttings desorption instruments, deep hole sampling devices, pressure testers, geological exploration desorption instruments, borehole flow meters, mine extraction and outburst prevention equipment, coal true density testers, gas content testers, automatic initial gas emission rate testers, diffusion rate testers, coal extraction pipeline gas parameter instruments, borehole coal powder circulation devices