Hydraulic rock drill is a rock hole drilling equipment, with the impact, rotation, propulsion, washing and other functions for the hole hole or bolt holes in the construction. Hydraulic rock drill structure is more complex,Road Router Crack so the parts damage reasons are also more complex. This paper analyzes the causes of damage to the main parts of hydraulic rock drill.
1. Accumulator end cover crack
Accumulator end of the cracks generated as shown in Figure 1, the crack has the following three reasons:
First, check the accumulator pressure method properly. Check the accumulator pressure can not be too frequent, it is easy to check when the accumulator airbag nitrogen leakage. Accumulator in the case of low inflation pressure to run, will result in the impact of hydraulic oil is too large. The impact force on the accumulator end cover, can lead to accumulator end cover cracks.
Second, do not replace the nitrogen filling pressure valve. Accumulator overhaul, should replace the nitrogen pressure valve. This is because the old nitrogen pressure valve through the long-term frequent open,high efficient crack router Instructions for use closed, the sealing surface will produce wear and tear. Nitrogen pressure valve sealing surface wear and tear, can cause accumulation of nitrogen in the air bag leakage, which led to the accumulator end cover cracks.
Third, the accumulator cap tightening force is too large. Failure to tighten the accumulator end cap in accordance with the specified torque can cause additional stresses in the interior of the accumulator, leading to early cracking.
2. Rinse head rupture
The rinse head is made of high-strength corrosion-resistant steel material, the role is to keep the water seal in the correct position and support stop ring. Rupture of the rinse head as shown in Figure 2, the rupture of the following three reasons:
First, manipulation errors. After a number of cases of rupture head rupture analysis concluded that the rupture caused by the main reason is the hydraulic rock drill in the absence of propulsion force to manipulate the impact of action, especially high-impact or reverse propulsion (counter-attack) Easily lead to rupture of the rinse head.
Second, the rinse head is corroded. Since the material used to make the flushing head can not be both high strength and good corrosion resistance, if the rinse water used has acid-base corrosion,advanced crack repair machine Construction process the flushing head will be corroded. This corrosion can produce cracks in the flushing head. Third, the front is corroded. The front end of the rock drill is equipped with a flushing head. If the front end is corroded, the flushing head is displaced forward. After the forward displacement of the flushing head, the recoil force generated by the rock drilling is transmitted to the connecting plate via the snap ring, causing the stress to concentrate at the hole at the front connecting plate.
Around the mouth. Because the connection plate is a component that connects the flushing head, stress concentration tends to cause rupture of the rinse head.
3. Front crack
The front end of the hydraulic rock drill is equipped with a guide sleeve and a wash head to withstand all the loads transferred from the shank. Figure 3 shows the location of the front crack, the reasons for its failure has the following three aspects:
First, operational errors. The rock drill is operated with low thrust, no propulsion or reverse thrust (backlash), and is operated for a long time. At this point impact piston impact force, through the stop ring and the rinse head to the front, can cause front-end crack.
Second, the front-end internal corrosion. If the front end of the internal corrosion, hydraulic rock drill operation in its corrosive parts will produce stress concentration, leading to the front crack. The crack will extend over time until it is completely broken. Third, rinse water corrosion. If the hydraulic rock drilling machine is using corrosive flushing water, will cause the front end of corrosion, the corrosion of parts will form a stress concentration, leading to the front crack.
4. Damage to impulse piston guide area
Impact piston The most common problem is the damage to the bearing area, causing the piston and guide sleeve stuck. Impulse piston damage to the region as shown in Figure 4, the damage caused by the following three aspects: One is the presence of pollutants. Impairment of contaminants in the impingement piston-bearing area includes: contamination of the hydraulic oil, resulting in poor contact between the impact piston and the guide sleeve; contaminants between the seal chamber and the rear end cap or impact piston guide,Environmentally friendly asphalt grinding machine market Piston on the neutral bad. The damage caused by the local surface temperature of the piston rises sharply, resulting in the impact of the piston surface has a small thermal cracking. This crack continues to expand inside the impact piston, eventually causing the impact piston to break.
Second, the bolt tightening force is not balanced. The bolts on both sides of the rock drill machine are damaged or the tightening force is unbalanced, and the tightening force of the rear end cap bolt is not balanced (the bolt is not re-tightened in the stipulated maintenance period), so the coaxial degree of each component of the rock drill can be reduced, Force is not transmitted along the straight line, and ultimately lead to impact piston guide area and the guide sleeve stuck or damaged. Third, the meshing surface corrosion. The guide sleeve and the piston meshing surface corrosion, resulting in increased impact when the piston friction, leading to the impact of piston guide area and guide sleeve premature damage.
