Mankind has always striven to create universal tools of creation, but rarely have these aspirations been crowned with success. But the creation of universal tools of destruction was much better. The hydraulic hammer is one such destructive invention, put to the service of good.
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It is called a hydraulic hammer because it is driven by the standard hydraulics of the mechanism and does not require any additional energy sources. It is a quick-release nozzle for excavators, loaders, pile drivers, manipulators, and other boom construction equipment used for dismantling.
The main parameter of the effectiveness of a hydraulic hammer is the impact force measured in J. Depending on its indicator, the equipment is divided into three categories:
Attached equipment designed for dismantling works in cramped conditions, and not requiring a lot of power applied effort.
Hydrohammers of this class are used for:
Among the leaders are the products of the conglomerate of manufacturers Atlas Copco AB and Krupp Berco Bautechnik.The range of niche equipment weighing from 35 to 415 kg is indicated by the letters SB. The advantage of the line is that the equipment can be mounted on excavators and loaders weighing from 500 kg.
The most common models:
Weight - 55 kg suitable for use on carriers weighing from 0.5 tons
Weight 520 kg, for mechanisms weighing from 5 tons.
In this segment, the products of the Japanese company Furukawa Rock Drill Co. deserve attention. Ltd, trademark of FRD.
Lightweight and easy to operate are the main features of this company's hydraulic hammers. Hammers in the weight range of 67 - 283 kg are equipped with internal damping elements, L-shaped side plates, an insulated mounting plate, providing noise and vibration damping. Equipped with a hydraulic control valve to synchronize the oil pressure of the attachment and carrier mechanism.
Hammer weight: 67 kg, impact energy: 160 J, impact frequency: 1250 beats/min, nozzle diameter: 36 mm, oil consumption: 20 l/min.
The most common type of this type of equipment, popularity provides versatility, fairly compact size, and the ability to perform the vast majority of dismantling work. Hydrohammers of this class are available for all types of work performed by the previous and additionally:
There are restrictions in work on objects with a high building density, in terms of the power of the equipment used: no more than 2,500 J.
Among the variety of mechanisms in this category, the products of Nippon Pneumatic, a Japanese company that appeared on the attachment market in 1961 and operates under the NPK trademark, attract attention.
Improvement in the design of the diaphragm hydraulic accumulator allowed the company to organize the production of a new GH line of middle-class hammers with an increase in impact force by 30% with the same product weight.
Weight 1900 kg, impact energy 4000 J.
Another representative of the family, manufactured by another Japanese company, Furukawa Rock Drill Co. Ltd. (FRD). Its mechanisms compare favorably with the presence of a hydraulic system control valve that allows you to synchronize the parameters of the hammer and the mechanism.
Weight: 1260 kg, impact energy 3579 J, oil consumption: 155 l/min.
Hydrohammers of this class are designed to perform work that was previously carried out with the help of undermining.
Used in production:
Due to the large diameter of the fragments and vibration, the use of heavy-duty breakers requires additional precautions.
The undisputed leader of the segment is HM 4000CS Krupp. In the production of its products, the company applies the principle of stepped sealing, which can significantly extend the life of the shock piston.
The heavy class has tremendous energy, which allows it to be used to solve other tasks that are not characteristic of younger brothers:
The principle of operation of this type of hammer is the mechanical impact on the head of the pile, leading to its immersion in the soil.
Adjustment of the impact force allows you to select the required deepening power and avoid destruction or deformation of the head of the submerged element.
Such equipment of all categories is produced by the Finnish company Junttan, a world leader in the development of technologies and equipment for pile work.
It is intended for immersion of reinforced concrete piles. Equipped with a side-mounted rotor for "leading" drilling, facilitating penetration in dense soils. L=16m, section 300x300; 350x350; 400x400, weight 6400 kg.
Hydraulic vibrators are designed to compact the soil to the required characteristics by driving piles. In the presence of replaceable nozzles, they successfully cope with reinforced concrete and wooden piles, sheet piles, shell piles, plastic and composite options.
The principle of operation of the mechanism: under the pressure of hydraulic fluid, a group of eccentrics creates vibration and, through the pile holder, transmits it to the immersed element.The thixotropic properties of the soil change its characteristics in the vertical and horizontal plane of contact with the pile body, reducing the friction force and ensuring the immersion of the pile element under the influence of its own weight and the mass of the vibrator.
Differs in high speed of immersion. The small dimensions of the mechanism allow the use of piles of maximum dimensions. A set of holder nozzles allows you to work on immersion of sheet piles, I-beams, channels, pipes, and in combination with a side grip, extract them.
Before choosing a hydraulic hammer, you need to learn the following rules, failure to comply with which can lead to premature failure of the mechanism, or an emergency during work.
Hydraulic hammers of all categories, in addition to the listed advantages, have one more thing: replaceable nozzles, which make it possible to significantly expand the range of work performed and increase their efficiency.
Nozzle types:
They are a metal rod made of wear-resistant steel. It is used for dismantling, crushing and grinding structures; Depending on the task, they differ in the type of tip: a chisel, a chisel are subdivided:
For this reason, nozzle manufacturers have developed new models of picks, giving the tip, instead of a cone, the shape of a three or four-sided pyramid. Longitudinal cracks are formed on the traverse of the faces, increasing the destructive effect and minimizing the possibility of jamming.
When splitting individual dimensional fragments, even a durable mineral, a tip in the form of a chisel has proven itself well. Two perpendicular faces create longitudinal cracks, accelerating the crushing of the rock.
In the development and loosening of frozen soils, the construction of faces, the nozzle with a tip in the form of a wedge is most effective.
Since the pike is a working element of a hydraulic hammer, the surface of the tip is subject to accelerated wear from interaction with dense minerals. The loss of the original configuration leads to a decrease in the efficiency of the mechanism and an increase in the load on the drive. The quality of the material from which the nozzles are made is of paramount importance.
Best Replacement Destruction Nozzle Manufacturer: Delta is a company with a proven track record for superior product quality. The nozzles offered by the company are made of high-strength, wear-resistant steel Hardox, produced by the Swedish concern SAAB and have an enviable service life.
Nozzles for soil compaction are designed and manufactured to give the mechanism universal use, but during operation it turned out that this method of compaction is much more efficient than previously existing and allows you to achieve density coefficients that are inaccessible to other methods.
Hammer compactor allows you to increase and stabilize the bearing capacity of loose, loose soils and quicksand to acceptable levels, eliminating the need for removal, replacement and other measures to replace unstable soil layers.
The hydraulic hammer market segment is saturated with manufacturers with various price offers and a range of products. This allows you to pick up attachments for equipment already in the fleet without resorting to expensive purchases.