Crushing hammer screw has influence on the whole machine life

The common screws on the crushing hammer are the whole body bolts, splint bolts, high pressure pack fastening screws, external displacement valve fixing screws and so on. The importance of screws is no less than the key parts of the machine, because of this, the Komatsu and Carter excavators in the construction machinery are all their own screws in the manufacturing of the whole car, with special marks, you can pay attention to it. This article will talk about the importance of screws to the crusher.

First, let's learn about the various strengths of screws. Screws are generally divided into 4.4 levels, 8.8 levels, 10.9 levels.12.9 levels, each level of screws has a standard, and the higher the level of tensile and vibration resistance, the higher the level. However, if the corresponding material is not used to make the same grade of screws, the higher the grade, the easier it is to break, because its mechanical properties cannot meet this standard. Let's analyze the damage caused by screw loosening and damage to the crusher in various places.

1, the whole body screws, generally produced with 12.9 grade alloy structural steel, the whole body screws are an important part of the upper and lower cylinder block of the fixed crushing hammer, if the screws are loose or broken, it will cause the piston and the cylinder when the heart is different and pull the cylinder, generally speaking, the whole body screws are made of high-performance alloy structural steel. Whether it is elongation or yield strength can reach the standard that carbon steel can not reach, so that even in a high-intensity working environment can still maintain a high toughness and strength, and now on the market in order to pursue maximum benefits, many new hammer assembly manufacturers use carbon steel modulating or non-adjustable production of screws to assemble the hammer. The harm of doing so is that the torque of the screw is reached, but as long as the vibration is generated by the work, it will soon be loose, especially in the place where the work intensity is relatively large in the mine, it will be tight again for a few hours, and it is a vicious cycle, and the extension rate reaches the limit after repeated tight several times, and the screw produced by the regular factory is tightened once it reaches the standard value. It will not be loose, and it is generally checked once a month. The most serious consequence of the loosening of the whole body bolt is the strain of the cylinder block.

2, splint screws, generally produced with 10.9 grade alloy structural steel, splint screws are an important part of the fixed hammer shell and movement, if loose after not timely tightening will cause the shell aperture and the shell liner due to large force caused by early wear, this wear will become more and more serious and finally scrap the shell, especially in the mine, Therefore, some mines that purchase cheap crushing hammer screws often see drivers with sledgehammers smashing screws before working every day.

3, the accumulator screws and external displacement valve screws, because this place is more special, generally with high temperature resistance and toughness of the material to do, the strength is generally relatively high, basically 12.9 level screws. Although the screw in this place like the accumulator base is relatively small, it has the largest effect, because the weight of a single accumulator is 30-40 kilograms, and the vibration generated during work is even greater than this force, but there are only 4 fastening screws, so the strength level requirements of the screws can be imagined.

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