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.
Claims5
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.
A lifting-up jig used to disassemble a cold head, the lifting-up jig comprising:
- 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 lifting-up jig main body is mountable onto a displacer drive unit of the cold head such that the lifting-up bolt is disposed to be parallel to an axial direction of the cold head, and
- wherein, when the lifting-up jig main body is mounted onto the displacer drive unit, the lifting-up bolt is rotatable relative to the lifting-up jig main body with the lifting-up bolt not moving in the axial direction.
Dependencies are inferred from the claim text.