CN-117463792-B - Method for replacing crankshaft of hot-rolled SSP (solid state processing) width-fixing machine

Abstract

The invention discloses a method for replacing a crankshaft of a hot rolling SSP (self-leveling machine) fixed-width machine, which comprises the steps of firstly removing an inner block frame, loosening connecting pins between balance cylinders, removing cutworms and sliding rails in the inner block frame, transversely moving and hanging the inner block frame away, removing an outer block frame, adopting a chain block to hold a crank, removing a crank hook head, loosening connecting pins between the balance cylinders, removing a worm drive universal shaft, moving the outer block frame, hanging the outer block frame out of a frame window by utilizing a crane, removing a crank mechanism, removing a catch bolt of the crankshaft, adopting a V-shaped bracket to fix a crank bearing seat, installing stool legs and adjusting a head bolt to prop against the crankshaft, removing a half-half fixing frame for fixing the crank bearing seat, removing an operation side girder support, hanging the crankshaft by adopting a crane, and sequentially returning the crankshaft, the outer block frame and the inner block frame after cleaning a rolling mill housing. The method improves the operation efficiency, reduces the operation time, saves the operation cost, and ensures the normal maintenance and the production operation of the hot rolling production line.

Inventors

• CAO YEFEI
• CHEN WEI
• DAI GUANGCHEN

Assignees

• 宝武装备智能科技有限公司

Dates

Publication Date

20260505

Application Date

20220722

Claims (4)

1. 1. A method for replacing a crankshaft of a hot rolling SSP width-fixing machine is characterized by comprising the following steps: Step one, dismantling an inner block frame, mounting a transition lining plate at the top of the inner block frame, dismantling an oil pipe and a water pipe connected in the inner block frame, loosening a connecting pin between balance cylinders in the inner block frame, dismantling a cutworm and a sliding rail in the inner block frame, and transversely moving and hanging the inner block frame away; Step two, dismantling an outer block frame, mounting an excessive lining plate on the top of the outer block frame, adopting a chain block to hold a crank, dismantling a crank hook head, dismantling an oil pipe and a water pipe connected in the outer block frame, loosening a connecting pin between balance cylinders in the outer block frame, dismantling a worm transmission universal shaft of a width adjusting mechanism, adopting the chain block to move the outer block frame and pass through the center side, and hoisting the outer block frame out of a window of a frame of the width fixing machine by utilizing a crane; step three, manufacturing an overhaul platform, a V-shaped bracket and stool legs, wherein the overhaul platform is formed by arranging rails and stairs by steel plates, and the stool legs are propped against a crankshaft through a support bolt; Step four, dismantling a crankshaft, hoisting an overhaul platform at the position of a crankshaft assembly, installing a fence, dismantling a crank mechanism of the crankshaft assembly and oil pipes and water pipes affecting hoisting of the crankshaft, dismantling a catch bolt of the crankshaft, hoisting a V-shaped bracket to be fixed on a crank bearing seat, installing stool feet and adjusting a support bolt to prop against the crankshaft, dismantling a half-half fixing frame for fixing the crank bearing seat, dismantling a girder support at the operation side of a width fixing machine, and hoisting the crankshaft by adopting a crane; step five, cleaning a mill housing, and sequentially reinstalling a crankshaft, an outer block frame and an inner block frame; and step six, measuring and adjusting the synchronous position of the crankshaft, the arc-shaped plate and the sector-shaped tooth gap.
2. 2. The method for replacing a crankshaft of a hot-rolled SSP (solid state machine) fixed-width machine according to claim 1, wherein during crankshaft reinstallation, the contact surface between a crankshaft bearing seat and a half-half fixing frame is cleaned, so that burrs are avoided on the contact surface, a 0.02mm clearance gauge is adopted for the contact surface after installation, the bolt fastening torque of a crank mechanism is 6654NM, the heating rotation angle is 95 degrees, the bolt fastening torque of the crankshaft bearing seat is 13111NM, and the heating rotation angle is 122 degrees.
3. 3. The method for replacing a hot rolled SSP constant width machine crankshaft as claimed in claim 1, wherein the adjustment range of the sector backlash is 0.355-0.888 mm, and the eccentric synchronization error of the crankshaft is less than or equal to 2 degrees.
4. 4. The method for replacing a hot rolled SSP stator crankshaft as claimed in claim 3, wherein the fan-shaped tooth gap is adjusted to 0.622mm.

Description

Method for replacing crankshaft of hot-rolled SSP (solid state processing) width-fixing machine Technical Field The invention relates to the technical field of equipment overhaul, in particular to a method for replacing a crankshaft of a hot rolling SSP (solid state processing) width-fixing machine. Background With the rapid development of continuous casting and rolling technology, the width-fixing machine has the advantages of high production efficiency, large width reduction adjustment range and the like, and gradually replaces a heavy vertical roller mill to be widely applied to a hot rolling production line. The SSP width-fixing machine is key equipment on a hot rolling production line, and the core component of the SSP width-fixing machine consists of an inner block frame, an outer block frame and a crankshaft assembly. According to design and field maintenance experience, the three key components are required to be repaired after being used for 5-6 years, the crankshaft of the SSP width-fixing machine is required to be replaced in the repairing process, but no guiding method for replacing the crankshaft exists at present, the crankshaft (weighing about 46 tons) of the width-fixing machine is fixed on a mill housing in a horizontal mode, the half weights of the bearing seats at the two sides are about 5T and are hidden under the upper cross beam, when the equipment is installed, in order to install the bearing half with a travelling crane, the maintenance worker utilizes 15T calabash to fix and hold the crankshaft, and the calabash runs the chain during the period, causes the crankshaft to drop down and hurts the dangerous megaaccidents. Therefore, how to quickly, efficiently and safely replace the crankshaft assembly becomes a maintenance difficulty, and the normal maintenance of equipment and the production operation of a hot rolling production line are seriously affected. Disclosure of Invention The invention aims to solve the technical problem of providing a method for replacing a crankshaft of a hot rolling SSP (single pass processing) fixed-width machine, which effectively reduces the difficulty and the safety risk of crankshaft replacement operation, improves the operation efficiency, reduces the operation time, saves the operation cost and ensures the normal maintenance and the production operation of a hot rolling production line. In order to solve the technical problems, the method for replacing the crankshaft of the hot rolling SSP width fixing machine comprises the following steps: Step one, dismantling an inner block frame, mounting a transition lining plate at the top of the inner block frame, dismantling an oil pipe and a water pipe connected in the inner block frame, loosening a connecting pin between balance cylinders in the inner block frame, dismantling a cutworm and a sliding rail in the inner block frame, and transversely moving and hanging the inner block frame away; Step two, dismantling an outer block frame, mounting an excessive lining plate on the top of the outer block frame, adopting a chain block to hold a crank, dismantling a crank hook head, dismantling an oil pipe and a water pipe connected in the outer block frame, loosening a connecting pin between balance cylinders in the outer block frame, dismantling a worm transmission universal shaft of a width adjusting mechanism, adopting the chain block to move the outer block frame and pass through the center side, and hoisting the outer block frame out of a window of a frame of the width fixing machine by utilizing a crane; step three, manufacturing an overhaul platform, a V-shaped bracket and stool legs, wherein the overhaul platform is formed by arranging rails and stairs by steel plates, and the stool legs are propped against a crankshaft through a support bolt; Step four, dismantling a crankshaft, hoisting an overhaul platform at the position of a crankshaft assembly, installing a fence, dismantling a crank mechanism of the crankshaft assembly and oil pipes and water pipes affecting hoisting of the crankshaft, dismantling a catch bolt of the crankshaft, hoisting a V-shaped bracket to be fixed on a crank bearing seat, installing stool feet and adjusting a support bolt to prop against the crankshaft, dismantling a half-half fixing frame for fixing the crank bearing seat, dismantling a girder support at the operation side of a width fixing machine, and hoisting the crankshaft by adopting a crane; step five, cleaning a mill housing, and sequentially reinstalling a crankshaft, an outer block frame and an inner block frame; and step six, measuring and adjusting the synchronous position of the crankshaft, the arc-shaped plate and the sector-shaped tooth gap. Further, during crankshaft reinstallation, the contact surface of the crankshaft bearing seat and the half fixed frame is cleaned, so that burrs are not generated on the contact surface, a 0.02mm feeler gauge is adopted for the contact surface after installation, the bolt fa