Method of disassembling a cold head and lifting-up jig
AssigneeSumitomo Heavy Industries, Ltd.
InventorsTatsuki Nishio, Shuntaro Adachi
Life of this patent
Estimating the term…
Abstract
Provided is a method of disassembling a cold head provided with a displacer that extends in an axial direction, a cylinder that accommodates the displacer, and a displacer drive unit that is fastened to the cylinder and is connected to the displacer such that the displacer is driven in the axial direction, the method including mounting a lifting-up jig onto the displacer drive unit, unfastening the displacer drive unit and the cylinder from each other, and operating the lifting-up jig such that the displacer drive unit is lifted up from the cylinder together with the displacer.
Claims8
A method of disassembling a cold head provided with a displacer that extends in an axial direction, a cylinder that accommodates the displacer, and a displacer drive unit that is fastened to the cylinder and is connected to the displacer such that the displacer is driven in the axial direction, the method comprising:
- mounting a lifting-up jig onto the displacer drive unit;
- unfastening the displacer drive unit from the cylinder;
- and
- operating the lifting-up jig such that the displacer drive unit is lifted up from the cylinder together with the displacer,
- wherein the lifting-up jig is provided with a lifting-up jig main body that includes a lifting-up bolt hole and a lifting-up bolt that is screwed into the lifting-up bolt hole,
- wherein the mounting of the lifting-up jig includes attaching the lifting-up jig main body to the displacer drive unit such that the lifting-up bolt is disposed to be parallel to the axial direction of the cold head, and
- wherein the operating of the lifting-up jig includes rotating the lifting-up bolt relative to the lifting-up jig main body with the lifting-up bolt not moving in the axial direction.
A method of disassembling a cold head provided with a displacer that extends in an axial direction, a cylinder that accommodates the displacer, and a displacer drive unit that is fastened to the cylinder and is connected to the displacer such that the displacer is driven in the axial direction, the method comprising:
- mounting a lifting-up jig onto the displacer drive unit;
- unfastening the displacer drive unit from the cylinder;
- operating the lifting-up jig such that the displacer drive unit is lifted up from the cylinder together with the displacer;
- and
- detaching the displacer drive unit from the displacer together with the lifting-up jig.
A method of disassembling a cold head provided with a displacer that extends in an axial direction, a cylinder that accommodates the displacer, and a displacer drive unit that is fastened to the cylinder and is connected to the displacer such that the displacer is driven in the axial direction, the method comprising:
- mounting a lifting-up jig onto the displacer drive unit;
- unfastening the displacer drive unit from the cylinder;
- operating the lifting-up jig such that the displacer drive unit is lifted up from the cylinder together with the displacer;
- mounting a displacer extraction jig onto the displacer;
- and
- raising the displacer extraction jig together with the displacer such that the displacer is extracted from the cylinder.
Dependencies are inferred from the claim text.