Bolt drilling rig is an indispensable tool in coal mine bolt support, and the development of bolt support requires a large number of bolt hole drilling equipment to ensure.

 

Anchor drilling rig is also called anchor drilling rig in some places, which is a drilling tool in coal mine roadway bolt support work. It has outstanding advantages in improving the support effect, reducing the support cost, speeding up the speed of roadway, reducing the auxiliary transportation volume, reducing the labor intensity, and improving the utilization rate of roadway section.

 

Anchor drilling rig is the key equipment of bolt support, which affects the quality of bolt support-the location, depth, accuracy of the hole and the quality of bolt installation, but also involves the operator's personal safety, labor intensity and operating conditions.

 

Working principle of rotary jet grouting anchor drill

 

1. In the layered rock formation, the anchor rod suspends the lower unstable rock layer on the upper stable rock layer. The pulling force on the anchor rod comes from the suspended rock formation.

 

2. In the thin rock layer without stable rock layer, after installing the anchor rod in peace of mind, the clamping force of the anchor rod will increase the friction force between the layers. This friction force can prevent the rock from sliding along the layer, thus locking several thin rock layers into a thicker rock layer through the anchor rod. The maximum bending stress and strain in such a thick rock beam is inversely proportional to the square of the thickness of the beam, and the thicker the integrated rock beam, the smaller the maximum bending stress and strain. At the same time, the strength of the anchor itself also increases the overall shear resistance of the beam.

 

3, the principle of anchor combination arch, when installing prestressed anchor in the fracture zone of the surrounding rock of the shaped roadway, the compressive stress distributed in the form of a circular cone will be formed at both ends of the rod body. If the anchor rod group is arranged along the roof, the compressive stress circular cone formed by each anchor rod will be staggered and overlapped to form a pressure-bearing arch to prevent the fracture zone from spreading, which can bear the radial load applied by the broken rock on its upper part. The pre-tightening force along the axial direction of the anchor rod produces hoop stress in the combined arch, which significantly improves the stress state of the pressure-bearing arch and changes the state of the surrounding rock from uniaxial and biaxial to triaxial compression. In this way, a uniform compression continuous bearing area is formed in the surrounding rock, thus greatly improving the bearing capacity of the composite arch.

 

The products are mainly sold to Shandong, Shanxi, Inner Mongolia, Xinjiang, Shaanxi, Henan, Anhui, Guizhou, Liaoning and other major mining areas in China, and exported to Russia, Ukraine, India, Vietnam and other countries. The company has offices in all major mining areas in China, and has a professional after-sales service team, which has been well received by customers at home and abroad.