Teacher's Day aims to recognize the contributions that teachers make to the field of education.

Through the passage of history, some marks have been eroded by wind and rain, while some memories are destined to be remembered for a lifetime. Today, September 3, 2020, is the 75th anniversary of the victory of the Chinese People's War of Resistance Against Japanese Aggression and the World Anti-Fascist War, a day worth remembering for every Chinese person!

Dickens said, "It was the best of times; it was the age of wisdom." The development of the modern internet is so wonderful that by writing a few short articles, I was able to reconnect with friends I hadn't heard from in a long time, as well as make many new friends; I am grateful for this era that brings us together in the same village; I am thankful for this era where information flows so freely.

With the rapid development of our country's economy, large-scale projects such as high-speed railways, highways, hydropower, and mining are continuously being constructed, among which the volume of tunnel excavation work is increasing, posing new demands on the progress, quality, and safety of tunnel construction. Currently, tunnel excavation in the world generally employs the drilling and blasting method and the TBM (Tunnel Boring Machine) method. TBM is a new and advanced tunnel construction machinery that excavates using rotating tools while breaking the surrounding rock and advancing, forming the entire tunnel cross-section. The prominent feature of this construction method is its high safety; however, the high cost of full-face tunnel boring machines, their large operating power, and maintenance costs are significant challenges.

The hydraulic rock drill is a type of rock drilling equipment that has multiple functions such as impact, rotation, advancement, and flushing, used for the construction of blast holes or anchor holes. The hydraulic rock drill includes an impact mechanism, a rotation part, a water supply and dust removal mechanism, a buffering mechanism, a lubrication and dust prevention mechanism, and a reverse impact mechanism.

Colorful butterflies dance gracefully, silently, only because of their love for flowers; white clouds guard quietly, silently, only because of their affection for the sky; soldiers have no regrets, steadfastly holding their ground, only because of their loyalty to the motherland. On Army Day, we salute the soldiers!

Four-sided sleeve

Large gear