The development of microwave assisted machineries to break …

THE DEVELOPMENT OF MICROW A V E ASSISTED MACHINERIES TO. BREAK HARD RO CKS. Ferri Hassani and Pejman Nekoovaght. Department of Mining and Materials Engineering, McGill University, Montreal, QC ...

A novel concept for a rock-breaking machine. II. Excavation …

In concrete-breaking, no problems were encountered in breaking the concrete itself but, if present in a three-dimensional array, the reinforcing bars could cause trouble. Tests with …

What is a Rock Breaker Machine and How Does It Work?

A rock breaker machine, also known as a hydraulic hammer, is a piece of construction machinery that is attached to excavators, backhoes, skid steers, and mini excavators. It consists of an arm which is the extension, and at the end of which is the hammer, which delivers repeated force to shatter rocks/ concrete into smaller and …

Video purportedly showing North Korea's military choir

A video purportedly showing North Korea's military choir covering the song "Killing in the Name" by Rage Against the Machine has been digitally altered. Although the images do show the country ...

5. Rock Excavation Tools | Drilling and Excavation …

it to be removed with a conventional bit. These combined systems could yield a two- to fourfold increase in drilling rates ().A similar system could be used to speed up the advance rate of tunnel boring machines (TBMs; Figure 5.7).Cutting slots in the rock with a novel device weakens the rock and allows conventional cutters to break the rock into larger …

The Rock-Breaking Mechanism of Thermal Spalling-Assisted Rock …

The challenges pertaining to low rock-breaking efficiency and high drilling cost in deep hard formation and hot dry rock (HDR) are highly pronounced. A novel drilling technology, the combined thermomechanical drilling technology, has demonstrated its potential to enhance the rate of penetration. However, the rock-breaking mechanism for …

The mechanism and performance of rock breakage by …

The rock breaking specific energy consumption decreases with as the cutting thickness increases, and there is a good linear relationship (R 2 = 0.92). When …

The Rock nickname, explained: The real story behind …

In an interview with WIRED, The Rock discussed how the name came to fruition, referencing his history with WWE Hall of Famer and legend the late Pat Patterson. "I used to throw around 300-pound ...

The Complete History of the Enigma Encryption Machine: …

The name "Enigma" was inspired by a piece called "Enigma Variations" composed by Edward Elgar. Scherbius likely connected the cryptographic concept of the machine to the enigmatic nature of Elgar's music. By the late 1930s, the German military was relying heavily on the Enigma machine to secure its vital communications.

In Memory of the Rock Band Breaking Circus

grim stories about such obscure affairs. as a man-killing Zamboni and a grudge-. laden marathon runner from Zanzibar. who knifed a man after finishing sixteenth. Each tale sped from you at such anxious rate. sarcastic showtunes abject …

How Alan Turing Cracked The Enigma Code

Enigma and the Bombe. The main focus of Turing's work at Bletchley was in cracking the 'Enigma' code. The Enigma was a type of enciphering machine used by the German armed forces to send messages securely. …

(PDF) A REVIEW OF EXPLOSIVE-FREE ROCK BREAKAGE (EFRB …

Mechanical rock breakage equipment such as tunnel boring and raise boring machines, road headers, continuous miners, and longwall drum shearers have been developed to break rocks with the aim of ...

What is a Rock Breaker Machine and How Does It Work?

A rock breaker machine, also known as a hydraulic hammer, is a piece of construction machinery that is attached to excavators, backhoes, skid steers, and mini …

Free-face-Assisted Rock Breaking Method Based on the …

In order to improve the rock breaking efficiency of hard rock tunnel boring, many innovative rock breaking methods have been proposed (e.g., the water jet cutting, the high-power laser cutting, the impact-rotary drilling, and the undercutting method). However, most of the methods are not applicable to TBMs due to some structural …

Insights into the breaking mechanism and fragment pattern of soft rock

Later on, Zhang et al. [6], [29] compared the rock breaking characteristics between free face-assisted and traditional breaking approaches and found that the cutting efficiency of free face-assisted is much higher than that of conventional cutting methods, indicating that free face-assisted rock breaking can be adopted to improve tunneling ...

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Experimental study on rock breaking using a microwave

The rock-breaking state of a real cutter was simulated in the experiment. The experimental results can be applied to practical engineering. The multi-functional rock-breaking platform was composed of two parts: a hydraulic system and a mechanical cutting system. The hydraulic system enabled the cutting device to move in three directions.

Environment-Friendly Techniques of Rock Breaking

On the other hand, environmentally friendly rock breaking methods have been developed and applied for rock tunneling (Res et al., 2003), including high voltage current (Shao et al., 2010 ...

7 Types of Excavators and Their Uses on the Construction Site

As its name suggests, a long reach excavator features a lengthier arm and boom sections. The design allows for better operation in hard-to-reach locations. The excavator's extendable arm can reach over 100 feet horizontally. These excavators are best used for demolition projects like structural crumbling and breaking down walls over …

Numerical simulation and experimental studies of rock-breaking …

To improve the efficiency of tunnel boring machines (TBMs) in hard rock environment, the technology of pre-grooving-assisted disc cutters for rock breaking was studied. Firstly, considering the relative position of the pre-grooving and the disc cutter, the same trajectory (SM) and different trajectory (DM) pre-grooving-assisted rock-breaking …

Safe and Efficient Rock-Breaking Strategies for Excavators

Pecking method. Use a pecking motion instead of continuously pressing the breaker against the rock. This involves lifting the breaker after each impact, which helps to fracture the rock more effectively and prevents the tool from getting stuck. Vary the impact points. Avoid hitting the same spot repeatedly.

Numerical simulation and experimental studies of rock …

To improve the efficiency of tunnel boring machines (TBMs) in hard rock environment, the technology of pre-grooving-assisted disc cutters for rock breaking was …

Study on the Classification and Identification Methods of …

Rock mass conditions are extremely sensitive to tunnel boring machine (TBM) tunneling. Therefore, establishing a surrounding rock excavatability (SRE) classification system applicable to TBM tunnels. Accurately and intelligently identifying excavatability grades can also facilitate efficient TBM tunneling and intelligent construction.

Research on the mechanism and performance of free-surface rock …

The optimal rock breaking performance was obtained when the tip width was approximately 1 mm. Compared with the traditional rock breaking method, the preslotting method can significantly reduce the cutter load. ... Tunnel boring machines (TBMs) are representative methods of rock breakage by mechanized cutting tools that depend on …

Rock Breaker 101

It can break larger rock slabs more easily and efficiently. On the other hand, lighter heads produce less power. These are often used for breaking smaller rock pieces. Choose Rasmussen. Rasmussen Equipment has been proudly serving the Utah area since 1947. …

Numerical and experimental research on the rock-breaking …

Different force sta tus of rock under and between the disc cutter: (a) Rock debris after cutting; (b) cutting mark after the rock debris was cleaned off. Fig. 3 .

Rock Crusher History

Rock Crusher History. History tells us, it was in 1830, the first US patent was issued on a rock crushing machine. It covered a device which, in a crude way, …

Simulation of Rock-Breaking Process by Drilling Machine

The results show that the hard rock is more prone to occur brittle failure under rotary percussive cutting, the rotary percussive drilling technology can improve the stress state of the PDC cutter ...