| 摘要 |
<p>The disclosure is directed to structural features of piercing and reeling mills to facilitate and expedite the changing of mill rolls, as is necessary from time to time for accommodation of new work sizes and/or for refurbishing of the rolls. The new mill construction includes a cap member which is removably secured to the upright members of the mill frame structure and forms, in effect, an integral part of the mill structure during normal operation. To effect changing of the mill rolls, provision is made for moving the cap to a laterally offset position, while still supported on the basic mill structure, to permit access to the mill rolls by means of an overhead crane. In the new mill structure, provisions for releasing and lateral offset movement of the mill cap is self-contained within the mill structure, so that the plant crane is not required to be utilized in removing the mill cap, as heretofore. In one form, the cap is supported on horizontal flanges or tracks and is moved by self-contained hydraulic actuators. In another form the mill cap incorporates combined clamps and wheel supports which, in one position, secure the cap to the mill uprights and, in another condition, provide mobile supports for the cap, permitting it to be rolled out of the way to provide overhead access.</p> |
