Tunnel projects are most likely to encounter hard rock sections. Drilling and blasting cannot be used, mechanical excavation is sluggish, and the milling excavator makes a clicking sound when it hits hard rock, with the teeth worn out, and the progress is like that of a snail. The client is frustrated and jumps with anger, the more frustrated, the more mistakes are made. To address this frustrating situation, Anneng has launched the XRailway tunnel impact milling excavator - blending "drilling" and "milling" together. The high-frequency impact first loosens the rock layer, and then the rotating cutter head cuts it. Hard rock instantly turns into "crispy cake". It directly replaces the excavator bucket, and with a hydraulic connection, it can start working. The single-cycle advance rate is more than 30% faster, the tool life doubles, and the return on investment far exceeds expectations.
What's this machine all about? In simple terms, it's a milling head with high-frequency impact installed on an excavator. The eccentric block generates impact force, cracking the internal rock layer, and then the milling cutter peels off. It's not like Drilling Rigs that need to drill a row of holes first and then have the gunners load explosives one by one; nor is it like blasting, which is full of anxiety. Many tunnel teams have encountered this infuriating situation: the Down-The-Hole Drilling Rigs just finished drilling the hole, but the blasting approval was not passed, and the entire team sat in the tunnel smoking. With this milling excavator, it's mechanical crushing, straightforward, and no longer dependent on others' moods. 
Some construction sites have tried Excavator Converted Drilling Rigs. That's converting a Drilling Rig onto an excavator. The impact stroke is short, and it is basically scratching the itch in hard rock. But this is a structure specifically designed for tunnel conditions. The frame is thicker, the shock absorption and buffering are better, and the operator won't feel the vibration for two hours. Compared with Drilling And Splitting Machines, that machine is suitable for handling large isolated rocks and is indeed less efficient on the working face. This model can operate continuously. Whether it's a highway tunnel, a railway tunnel, or a water diversion tunnel, when encountering granite or quartz sandstone, it can still handle it. You might say, use Ultra-high pressure Rock Splitters, but that machine still needs to drill a hole first and then install a high-pressure pipe. The process is complicated. Meanwhile, this milling excavator has already cleared half a truckload of debris. Even in the common mining conditions, it works well in tunnels. This one machine can be used for multiple purposes, saving money on maintenance costs.
In terms of usage, it can not only dig the working face, but also excavate the arch of the tunnel, form the water ditch and cable trough, and shape the outline. It can do everything. Some bosses even use it to mill old road surfaces, which is much smoother than a crushing hammer. The equipment is equipped with automatic flow compensation, and the vibration speed of the excavator does not affect the impact frequency, making the work stable.
Product features:
1.High-frequency impact + rotational cutting dual action, the efficiency of hard rock is 40% higher than that of ordinary milling excavators.
2.Direct replacement of excavator attachments, a connection can be completed in 30 minutes, no welding or modification required.
3.The cutter teeth are wear-resistant, if they break, they can be replaced individually, and the entire tool will not be scrapped.
Tips:
1.Maintain stable feed pressure during milling. Don't force it. Let the impact head "drill" itself in. The effort is equivalent to wearing the cutter.
2.At the end of each shift, use high-pressure water to rinse the milling head to prevent mud from solidifying and clogging the bearing. This habit can extend the service life by half a year.
In summary, Anneng's XRailway tunnel impact milling excavator is a relief for us tunnel workers. The construction period is shortened, and money is made. If you need it, bring a rock sample, and we will directly test it for you.
Jiangsu Aneng Drilling Equipment Technology Co., Ltd.