Hydraulic breaking hammer (commonly known as hydraulic hammer) is a unique four column hydraulic machine. It integrates pressure regulating valve, electric actuator, accumulator and other hydraulic parts into one. The pressure regulating valve and the electric actuator feedback control each other. The linear movement of the piston rod is fully automatic, and the working pressure energy of the liquid is converted into the impact performance of the piston rod. The reciprocating fitness movement of the piston rod of the hydraulic hammer in the sales market is all carried out by the interaction force of the hydraulic press, while the stroke fitness movement of the piston rod can be divided into nitrogen explosion hammer, full hydraulic hammer and liquid hammer according to the source of the interaction force during the stroke.
In recent years, China's demand for large and medium-sized hydraulic hammers has been improved due to the necessity of capital construction and the continuous increase of server tonnage. The inherent basic theoretical defects of hydraulic hammer are gradually presented with the improvement of impact force of hydraulic hammer. Large and medium-sized crushing hammers of hydraulic hammer manufacturers have global bottleneck problems. The mating surface of piston rod and engine cylinder block is easy to be bruised and has a short life (600-2500h of damage for many times), which leads to a lot of luxury and waste of resources and delays the construction period. Therefore, it is urgent to explore this new design.
Because the piston rod and the engine cylinder block are sealed by the gap, the piston rod in the whole process of linear movement is very easy to bruise the surface of the fitness exercise pair (contusion usually means that the sliding friction between the piston rod and the engine cylinder wall is too large, resulting in the problem that the surface of each other is not smooth). After contusion, the hydraulic hammer can not work normally. In this case, the engine block must Grind the internal thread that matches with the piston rod again, and the piston rod will be charged.
Cutting the engine block again will cause the following problems:
(1) In order to ensure the mutual matching gap, the piston rod and framework must be added for sealing (the sealing ring can not be applied with standard parts and is not universal, which will increase the cost of work).
(2) Cause the engine block to be charged (because the high carbon steel raw material selected for the engine cylinder block must be nitrided to improve the surface strength. After contusion, carry out cutting again to make the nitriding layer soft or reduce the strength. If the mutual matching surface does not have sufficient strength, the engine cylinder body will be charged).
The contusion of engine cylinder block is the key reason for the large and medium-sized hydraulic hammer to report the cost. It is the defect of large and medium-sized hydraulic hammer, which damages the environment and increases the construction cost.
To explore the technical specifications for the negative pressure support plate and moistening structure of the piston rod of the hydraulic crushing hammer will greatly increase the service life (in basic theory, never pull the cylinder), it will certainly change the global market competition layout of the product, which is a subversive attack on the manufacturing industry. Only China has a total sales market of 10 billion yuan over the years, and the development prospect of large and medium-sized hydraulic hammers is broad.
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