Excuse me, where is the production of large-caliber winding pipe thread connection cutting machine in China? 5 I have seen such a machine,The principle is to cut the outer wall of one end of the pipe to half the wall thickness,Left thread and inner wall,Processed into an external thread form,Cut the inner wall of the other end of the pipe to half the wall thickness,Left thread and outer wall,Processed into an internal thread form,So,The principle of forming screws and nuts.During construction,Connect, rotate and tighten the two pipes,Sealing strips or welded joints can be used to seal.This method can save expensive electric melting belts,Greatly reduce the cost of connection construction,The connection is stronger and stronger.This equipment is produced in Shandong.

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My electric sewing machine can't hang the bottom line. who will repair it? The first step is to change the needle.The second step is to move the needle down for a 2mm try,If it's OK,Just remove the panel,Move the needle stick down to 2mm.If not, step 3,See if the shuttle is very convinced,Is very convinced,Then see if the tip of the swing shuttle below is rubbing the top of the needle eye,If the shuttle is sharp and close to the needle,It should be above the needle to hook the line,Try it again.Very simple,First of all, be sure to install the needle!Slowly turn the pulley when the needle is about to reach the lowest point, at this time the shuttle's Threading Needle happens to reach the groove above the needle eye of the machine needle!The shuttle needle is next to the machine needle, but don't touch the machine needle.If the above conditions are not met, make corresponding adjustments.Note that,If the shuttle's pick needle is seriously worn and deformed, it will jump.You first see if the tip of the shuttle i