Mounting and dismounting device for cylindrical bodies

A mounting and dismounting device for a cylindrical body, comprising:

• a fixing element in a semicircular shape, whose both ends extend outward a protruding part, respectively;
• wherein each of the protruding parts has a first through hole in the longitudinal direction, a horizontal groove penetrates through both sides of the fixing element, and one end of the horizontal groove has a second through hole through the horizontal groove;
• a moving element in a semicircular shape, whose both ends have a recess part inward, respectively;
• wherein the two protruding parts of the fixing element are embedded in the two recess parts, both ends of the moving element have a third through hole through the recess part, respectively, the first through hole on the protruding part is connected with the corresponding third through hole, a pivotal axis and a positioning axis go through the connected first through hole and third through hole so that a hole forms in the fixing element and the moving element for the cylindrical body to mount, and the positioning axis is inserted into or withdrawn from the first through hole and the third through hole;
• and
• a buckling element whose one end has a buckling part in the shape of a cam and having teeth around its rim and whose other end has a lifting part that lifts when urging, wherein the buckling part has a fourth through hole in the longitudinal direction and a mounting hole for an auxiliary tool to connect and to lift, the buckling part of the buckling element extends into the horizontal groove of the fixing element, the fourth through hole and the second through hole of the fixing element are connected and penetrated by another pivotal axis, and when pivotally swinging the buckling part penetrates into the hole in an appropriate depth to urge against the cylindrical body according to the diameter size thereof.