Piston compressor crosshead
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What to do if the crosshead connection bolts are too tight to remove? The wrench handle has slipped; is there any solution?
Two methods are provided for reference first; one is grilling with a flame (gas cutting torch)； Second, use a angle grinder to grind the diagonal surfaces of the bolts. You might as well give it a try.
Consult the manufacturer; there should be specialized tools available
It must have all the hydraulic tools! Ask the manufacturer
Do you replace the crosshead and piston rings, or the packing gland? There are generally two types of connections for the crosshead in reciprocating compressors: one type uses only one nut, along with a lock washer and a spare nut; the other type requires a specialized hydraulic tool to loosen it easily!
What size nut? There are two possible reasons for slippage: either the gap between the wrench and the nut is too large, or the threads are stripped. 1. The nut’s edges have slipped, so a single wrench definitely won’t work; in that case, use two wrenches stacked together as a special tool. Shape the handles of the two wrenches into a star shape as shown in the diagram, cut open the ends of the handles, weld ears to both sides of them, drill holes in those ears, insert bolts through the holes, and secure them onto the nut that needs to be removed. Wrap a thick tube around the wrench handle, and have several people work together to lift it upward. Meanwhile, another person should use a sledgehammer to strike the wrench handle from above. Before doing this, steam the nut (make sure to take care not to let water get into the fuel tank). 2. Find a thick round steel bar 50 centimeters long; one end of the bar should be pressed against the nut in the direction of the thread tangent. One or two people should hold the bar steady, while another person uses a hammer to strike the other end of the bar. Be sure to pay attention to safety to avoid hitting anyone. 3. If it still cannot be removed, it may be because the fit is too tight, causing the threads of the nut to lock tightly with those of the bolt. If there is a spare nut available, one can use a angle grinder to grind the nut open, or use a hydraulic nut splitter to break it apart directly. 4. If a hydraulic wrench is available, use it for removal; ensure that the gap between the hydraulic wrench and the nut is not too large. 5. Contact the manufacturer to obtain a set of special tools for disassembling hydraulic nuts using hydraulic interference fitting.
It was likely gas welding and cutting; otherwise, the impact wrench would have been welded to the nut, and the axis’s bending degree would need to be checked again after it was removed
It is hydraulic, with a dedicated pressure pump and pressure chamber. The units were all brought along as a set
Is there such an operation too? Try it later
Go to the warehouse and look; there should be a compression head available. Screws with threads can almost certainly be compressed