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Expansive Agent, Carbon Dioxide Blasting, Hydraulic Splitting Machine, Rock Splitter And Other Engineering Methods Introduced May 07, 2018

When explosives cannot be used for blasting in mining and construction earthworks, a large number of hard rocks must be broken. Either using large “breakers” for direct chiseling or using “rock expansion agents” for static blasting, the efficiency is somewhat low. And the construction cost is higher. In the case where blasting is not allowed, how can we effectively crush the rock and reduce the cost as much as possible? In the whole world, there are actually many units or individuals who are studying these technologies and equipment. Here are the seven domestic methods and equipment. .


1. Explosive breakers: also known as silent expansion agents, static breakers, are the method used for static blasting for a long time, domestic use is very extensive, the purchase cost is not too high, but there must be empty surface before construction, conventional drilling The hole diameter is about 4 cm (about 8 cm in size), the interval is generally tens of centimeters, and the maximum number of constructions is 2 to 3 rows (1 meter wide) at one time. The reaction time ranges from a few hours to 10 hours (temperature There is a difference between the levels, and the temperature is too low to be unresponsive.) Stones are hard to guarantee, and there is no rain, and not all rock formations are suitable. However, it has to be admitted that this method is the most common and most stable and mature method used in China except for direct hammering with a breaker. Many manufacturers, although some high-performance products, but there is no major breakthrough. In short, it's okay to go small and small, but it's difficult to complete the generous amount. The mine will not be considered for basic use. The reason is slow and inefficient. Although it is not expensive to calculate the expansion agent alone, the final calculation of the lost operation cost is not low.

hydraulic rock splitter

2. Carbon dioxide gas explosion: also called carbon dioxide cracker, the country has basically been stopped, into the supervision of civilian explosive equipment. Since it cannot be approved for blasting, this method has not been expected to be approved and illegal activities cannot be done. Therefore, there is no need to study carbon dioxide blasting equipment.


3. Roulette saw cutting machine:


3.1 Small-sized single-blade cutter: The Leshan cutter has been widely used in the Sichuan-Yunnan region since the 8/90s. It cuts sandstone to sell the stone, and the cutting depth is usually about 50 centimeters. The earthwork site cannot be demolished. Also use this method to construct.


3.2 Large-sized double-blade cutter: This kind of equipment has also undergone changes and upgrades. Some stone material yards are mined with large double-blade disc saws, large ones can be cut to more than 2 meters deep, and earthwork sites are broken in this way. rock. Disadvantages are the long time for laying the track, the trouble of moving the position and so on.


3.3 Digging machine with hydraulic sawing machine: In the past few years, manufacturers have also put out a hydraulic saw that can be installed on the excavator. The hydraulic pressure of the excavator is used to drive the wheel. According to the purpose of turning to cut the stone, single blade and double blade All have. The idea is very good, and it is also convenient to install it on a digging machine. But has such low-cost and convenient equipment not been popularized for many years? The most convenient and cost-effective single-blade small-cutting machine in the Sichuan-Chongqing area is definitely a reason. It is nothing more than the lack of mature products and technologies and high failure rates.


The advantage of the roulette saw cutting machine is that for sites that are not tight on schedule and have good stone materials, they can subsidize the point cost by cutting and selling stones. However, for the rock crushing construction, these three types of cutting machines still have the problems of low construction efficiency, high utility costs, and high unit price for construction. There are many rock types in the country that are not suitable for such equipment and methods.


4. Surface miners: There are mainly foreign "land level kings" and "crushed rock diamonds". However, they are very rare in China. It is estimated that there are not many choices for working conditions and the cost of consumables. It will naturally be more and more if such equipment can reduce the unit price of construction for the majority of domestic rock construction effects and production.


5. Small hydraulic rock splitter: also called hydraulic splitting machine, small rock splitter equipped with several hand-held hydraulic guns, more convenient. In the 1980s, Germans began to use the wedge group principle to manufacture such equipment. The early domestic imports were used for rescue. It was a hydraulic demolition equipment. It was good for the splitting of individual rocks and the destruction of concrete. Large-scale rock splitting appeared to be a force. Limited, domestic 10 years ago began to refer to production, basically all in the drilling diameter of 5 cm or less, although many domestic manufacturers, technology is relatively mature, but the application of rock mining is basically no, small and small amount of It is rarely used in the project.

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6. Airborne hydraulic rock splitter: also called large-scale airborne splitter, this is also applied to the wedge principle (an intermediate wedge and two reverse wedges) inserted into the hole, the middle wedge acting on the hydraulic pressure The forward movement between the two opposing wedges releases a large amount of energy from inside to outside, destroying the structure from inside the rock and splitting the rock in a predetermined direction.


This rock splitter machine is equivalent to making the hand-held splitting rifle bigger. It is hung on the excavator and connected to the hydraulic system of the digging machine as the driving force. This device had two companies (military and civilian) in Japan for several decades, and it had entered the country 10 years ago. This is the true meaning of rock hydraulic equipment used in mining and earth-rock construction. The diameter is 11 and 14 centimeters (this diameter can be very great at that time), but soon the device is also facing the problem of deformation of the wedge block, telescopic failure, and the short break of the hard rock.


With the application of this equipment in Japan, after 2010, many domestic manufacturers have begun to sprung up, Guangdong, Shanghai, Hebei, Hunan, Shandong, Shanxi...


In this process, there are also some evolutions, such as drilling and splitting (Japan has also been out), and some manufacturers are equipped with a small hydraulic power station separately. There is an independent hydraulic drive source without connecting the hydraulic pipe of the excavator. The overall mobility is so bad that it can be connected to power or electricity. However, these two kinds of airborne splitters, splitters, or mountain lifters use pressures of only a few tens of MPa (single cylinder power and limited effect).


Japanese companies have made little effort to delve into this equipment for decades, but there is always a fatal flaw: even if wedges are made of good steel in the country, they will be deformed or even deformed if they encounter hard stones. Fracture (domestic can not hold on for many days), so the replacement of the wearing parts, the cost is always down, and eventually led to the disappearance of this product.


It has been proved that the wedge-type principle is very stable and durable on the Germany's small split-shotgun. However, the durability of large-scale airborne mountain-opening equipment is always a bottleneck, but it has to be admitted that the ratio of domestic and foreign-made has so far Japan's two products are considered to be the top in the world, and their technology maturity and stability are much better than domestic ones. Japan's steel quality and industrial technology should be compared with China. Whoever believes better that everyone has a certain number of minds. Japanese steel products are still difficult to guarantee long-term use of products, and it is even more difficult for domestic companies to make them durable.


7. Piston rock splitter/hydraulic rock splitter: also known as hydraulic rock splitter, rock splitter/hydraulic splitting bar, consists of two parts: hydraulic pump station and splitter bar (one pump station can be equipped with 6 Root splitting rod) The ultra-high pressure oil driven cylinder output by the pumping station generates a huge driving force, and after the hydraulic piston is extended, the rock can be opened in a predetermined direction, and the compressive strength of the rock is utilized to greatly increase the physical and mechanical properties of the tensile strength.

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South Korea produced and used it in the 1990s. It was introduced in Hong Kong, Macau, and Guangdong around 2010. The diameter of hydraulic rods in Korea was very large at that time. The borehole diameter was generally about 10.5 centimeters, and the degree of automation and stability were quite similar. High, this was later difficult for domestic manufacturers to achieve. (The larger the diameter of the hydraulic rod, the stronger the technical strength, because it is not as simple as making iron large enough to meet the pressure of the system and the rapid increase in pressure while ensuring The stability of the entire system is a world-class problem.


The rock cracks that can be formed at the same time by putting six hydraulic rods Which must be better than the wedge type <6> above. This is a very good understanding. At that time, each hydraulic rod was about several tens of pounds and could be put into and extracted from the rock hole by hand. This was as convenient as the splitting gun <5>, but the plunger-type hydraulic rod made the diameter larger and the strength increased. And the effect is also getting better, which forms an important factor that the plunger type <7> can surpass the wedge type <6>. In addition, this technical principle is more stable, and there is no defect that the wedge group is easily deformed or broken.


In a few short years, many domestic companies are producing such equipment. The diameter of boreholes in ramming bars is usually about 9 cm or 11 cm. It is difficult for them to exceed the strength of Korea in both strength and quality (domestic defects are easy to leak and damage. Or the effect is too bad. Until 2014, the company developed a hydraulic splitting rod with a drilling diameter of 18 cm. The strength and effect have been surpassed. (The increase in diameter and diameter of the hydraulic rod is a major technical breakthrough.) Because of the increase in the number of hydraulic rods, the entire pressure system can be matched. It is remarkable that hydraulic high pressure can be used to support large diameter hydraulic rods.


In 2015, the “static explosion brand super rock splitter” revolutionized the technical standards in this field. The drill hole diameter reached 25 cm, and the weight of a single hydraulic splitting bar was 450-1000 kg. In and out), with a pressure of more than 150 MPa and a splitting force of over 10,000 tons, this large-scale rock splitter/hydraulic splitter has changed the output of hydraulic ripper/aircraft splitter construction at any time. The view is an innovative product with independent intellectual property rights.