Hydraulic cultivator
Hydraulic attachment milling machines, or concrete milling machines for short, belong to the group of hydraulically operated attachments , as do hydraulic hammers , pulverizers, demolition cutters and many other tools.
In general, a milling cutter is understood to be a rotating tool equipped with knives or chisels , including a drive for material-removing machining of various materials. Metal and woodworking are their main areas of application. Hydraulic milling machines are mainly used in tunnel, sewer, road and mining as well as in building demolition. The devices can also be found in the iron and steel industry, earthworks and forestry. Cultivators with an excavator or a comparable vehicle as a carrier device are suitable for peeling off soil and rock material as well as wood, masonry, bituminous surfaces, concrete and even reinforced concrete . Even underwater use is possible.
Hydraulic add-on milling machines essentially consist of a bevel planetary gear and a cutting or milling head equipped with staggered round shank bits . A hydraulic motor with a constant displacement usually takes over the drive . The milling machine is mounted on the carrier device via a rigid or rotatable mounting bracket. The carrier hydraulics supply the milling machine's hydraulic motor. The oil pressure provided by the carrier controls both the cutting torque and the speed of the cutting head. Hydraulic add-on milling machines are available as single milling machines or milling machines with a longitudinal cutting head and as milling machines with a pair of milling drums, also known as milling machines with a cross cutting head. These in turn have been further developed by the KEMROC company over the years with a milling chain running between the cutting heads. As a result, this device achieves around 40% more material discharge in the same time than a comparable model from other manufacturers. The milling head advance results from the contact pressure that the carrier device provides. The material to be milled determines the type of chisel. There is a large range of different cutting heads and chisels for modern milling machines so that the devices can be adapted to different operating conditions.
Hydraulic mounted milling machines have their origins in electro-mechanically driven roadheading machines, which were first developed and used around 1910 for driving and extracting hard material in mining . In the mid-1960s, the British manufacturer Webster launched the first hydraulically or hydrostatically driven roadheaders for the British coal mining industry as a low-noise and low-vibration alternative to hydraulic chisels and rock breakers. In the 1980s, the first hydraulic milling machines were offered as attachments for hydraulic excavators and were used for the first time outside of the mining and tunnel construction sector in a wide variety of construction applications.
Today the world market for hydraulic milling machines is mainly shared by the following companies: The market leaders are the German manufacturers KEMROC Spezialmaschinen GmbH from Leimbach in Thuringia, as well as ERKAT Spezialmaschinen und Service GmbH in Tiefenort in East Germany. Milling machines from the South African manufacturer Boart Longyear and the Italian company SIMEX are also on the market .