CN-118989888-B - Assembly method of driven shaft device of main transmission mechanism of seamless steel tube cold rolling mill

CN118989888BCN 118989888 BCN118989888 BCN 118989888BCN-118989888-B

Abstract

The invention discloses an assembly method of a driven shaft device of a main transmission mechanism of a seamless steel tube cold rolling mill, which comprises the following steps of 1) operation preparation, 2) rolling bearing precision correction, 3) precision assembly of a left eccentric gear and a right eccentric wheel, 4) flat key precision measurement assembly and 5) assembly precision inspection. The fixture disclosed by the invention has the advantages of reasonable design, convenience in use, high eccentric gear installation precision, reasonable detection and configuration method, convenience in operation, accurate and reliable working clearance of the rolling bearing, and meets the technical requirements of cold-rolled tubulation of high-alloy element and high-strength new steel seamless steel pipes on the basis of ensuring the precise assembly of a driven shaft device, and the fixture is practical, efficient, safe, reliable and controlled and stable in quality.

Inventors

CHEN TAO
CAI BIN
LI XIAODONG

Assignees

宝武特种冶金有限公司

Dates

Publication Date: 20260508
Application Date: 20230519

Claims (7)

1. The assembly method of the driven shaft device of the main transmission mechanism of the seamless steel tube cold rolling mill is characterized by comprising the following steps of: (1) Preparing materials, preparing a bevel gear precision correction measuring scale and modifying a main shaft key slot; (2) The precision correction of the rolling bearing comprises taking out the bearing supporting ring of the rolling bearing, correcting the state of the rolling bearing, obtaining the mating thickness of the bearing supporting ring, mating and directionally assembling the bearing supporting ring to make the working play of the rolling bearing qualified, The rolling bearing accuracy correction further includes: (2.1) preparation of bearing measurement, namely vertically placing the rolling bearing on an operation platform, taking out a bearing support ring between an upper inner ring and a lower inner ring of the rolling bearing, and correcting the verticality of an outer ring of the rolling bearing; (2.2) measuring and recording the actual distance between the upper inner ring and the lower inner ring of the rolling bearing, manually rotating the outer ring of the rolling bearing, and measuring and recording the actual distance between the upper inner ring and the lower inner ring of the rolling bearing again; (2.3) determining the mating thickness of the bearing support ring, namely calculating the mating thickness of the bearing support ring according to the actual distance between the upper inner ring and the lower inner ring of the rolling bearing and the use precision requirement of the rolling bearing; (2.4) checking and confirming working clearance of the rolling bearing, namely assembling a bearing support ring after matched grinding between an upper inner ring and a lower inner ring of the rolling bearing, manually rotating the outer ring of the rolling bearing, measuring and recording the clearance between the rolling body and the outer ring on the upper inner ring of the rolling bearing, calculating the actual working clearance of the rolling bearing, and if the actual working clearance is within the working clearance equivalent of the rolling bearing, checking the working clearance of the rolling bearing to be qualified; (2.5) repeating the procedures to finish the precision correction of the two sets of rolling bearings; (3) The precision assembly of the left eccentric gear and the right eccentric gear adopts a temperature difference method to directionally assemble the left eccentric gear on one side of the closed key slot of the main shaft, sequentially and directionally assemble the parts between the left eccentric gear and the right eccentric gear of the driven shaft device, then adopts a temperature difference method to directionally assemble the right eccentric gear, and quickly corrects the synchronism of the right eccentric gear and the left eccentric gear, The left eccentric gear and right eccentric wheel precision assembly further comprises: (3.1) installing a flat key and a left eccentric gear on one side of the main shaft, namely installing the flat key in a closed key groove of the main shaft in a directional manner, and adopting a temperature difference method to install the left eccentric gear on one side of the closed key groove of the main shaft in a directional manner, so that the end face of the left eccentric gear is flush with the end face of the main shaft; (3.2) repositioning the main shaft, namely turning the main shaft assembled with the left eccentric gear upside down, enabling one side of an open type through key slot of the main shaft to be upwards, and vertically placing the main shaft on an operation station; (3.3) installing the components on the main shaft, namely installing the positioning element, the left rolling bearing, the positioning sleeve, the right rolling bearing and the positioning element on the main shaft in sequence and orientation; (3.4) assembling the right eccentric wheel, namely heating the right eccentric wheel by adopting a temperature difference method, directionally assembling an axle hole key slot of the right eccentric wheel and an alignment port of an opening type through key slot of the main shaft, and rapidly correcting the synchronism of the right eccentric wheel and the left eccentric wheel; (4) Measuring the offset of a shaft hole key slot of a right eccentric gear and an open type through key slot on a main shaft, and preparing and assembling a flat key; (5) The assembly accuracy test is to test the synchronicity of the left eccentric gear and the right eccentric gear of the driven shaft device, the working clearance of the rolling bearing and the axial clearance, The assembly accuracy test further comprises: The synchronicity of the left eccentric gear and the right eccentric gear is detected, the offset of the inner side angle of the helical teeth and the outer side angle of the helical teeth is obtained, and the offset is compared with the helical tooth assembly standard of the driven shaft device to judge whether the offset is qualified or not; Checking working clearance of the rolling bearings, namely respectively comparing gaps between two outer rings of the rolling bearings on the main shaft and rolling bodies on the inner side of the upper inner ring of the rolling bearings with working clearance standards of the rolling bearings of the driven shaft device, and judging whether the gaps are qualified; and (5.3) checking the axial clearance of the driven shaft device, and detecting the joint of all parts assembled on the main shaft of the driven shaft device by using a feeler gauge to ensure that the clearance of the joint of all the parts is 0.
2. The method of assembling a driven shaft device of a main transmission mechanism of a seamless steel pipe cold rolling mill according to claim 1, wherein in the step (1), the operation preparation comprises the steps of safety technology engagement, site safety precaution implementation, preparation of tooling equipment and spare parts materials, cleaning of the spare parts materials, checking of drawings, preparation of a bevel gear precision correction measuring scale and modification of a main shaft key groove of the driven shaft device.
3. The assembly method of the driven shaft device of the main transmission mechanism of the seamless steel pipe cold rolling mill according to claim 2, wherein the bevel gear precision correction measuring ruler is of a curved ruler structure and is formed by welding round steel and a rectangular ruler, one end of the round steel is formed by centering welding with one end of the rectangular ruler, the welding angle is consistent with the inclination of an eccentric gear of the driven shaft device, and the surface roughness of the bevel gear precision correction measuring ruler is not lower than R a 1.6.6.
4. The method for assembling a driven shaft device of a main transmission mechanism of a seamless steel pipe cold rolling mill according to claim 2, wherein in the key groove of the main shaft of the reformed driven shaft device, the closed key groove on either side of the main shaft is reformed into an open type through key groove, and the open side of the open type through key groove is communicated with the end face of the main shaft.
5. The method for assembling a driven shaft device of a main transmission mechanism of a seamless steel pipe cold rolling mill according to claim 1, wherein in the steps (2.2) and (2.4): Measuring data of at least three points when measuring the actual distance between the upper inner ring and the lower inner ring of the rolling bearing, and/or At least three rotations when rotating the outer ring of the rolling bearing, and/or When the outer ring of the rotary rolling bearing is rotated, a weight with the mass not lower than 10kg is placed at the fixed end of the upper inner ring of the rotary rolling bearing.
6. The method for assembling a driven shaft device of a main transmission mechanism of a seamless steel pipe cold rolling mill according to claim 1, wherein in the step (3.4), the quick correction of the synchronism of the right eccentric gear and the left eccentric gear comprises: the round steel section of the bevel gear precision correction measuring tape is directionally placed in a tooth slot of a right eccentric gear, a rectangular ruler of the bevel gear precision correction measuring tape is freely and vertically directed to a left eccentric gear at the bottom, at the moment, offset of the outer side angle and the inner side angle of the right eccentric gear and the left eccentric gear is immediately measured, and the right eccentric gear is knocked to rotate slightly to realize correction; continuously measuring for three times, wherein the measuring comprises at least a near-shaft hole key groove part of a right eccentric gear and a near-connecting rod pin part; the total time of the correction process is not more than 5min.
7. The method for assembling the driven shaft device of the main transmission mechanism of the seamless steel pipe cold rolling mill according to claim 1, wherein the method comprises the following steps: In the step (5.1), when the offset of the inner side angle of the helical teeth and the offset of the outer side angle of the helical teeth meet the helical teeth assembly standard of the driven shaft device, the synchronicity of the left eccentric gear and the right eccentric gear is qualified, otherwise, the left eccentric gear and the right eccentric gear are disassembled and reworked for disposal, and/or In the step (5.2), when the clearance between the two rolling bearing outer rings and the upper inner ring rolling bodies at the inner sides of the two rolling bearing outer rings meet the working clearance standard of the rolling bearing of the driven shaft device, the working clearance of the rolling bearing is qualified, otherwise, the rolling bearing is disassembled and reworked for disposal, and/or In the step (5.3), when one gap at the joint of each component assembled on the main shaft of the driven shaft device is not 0, the gap is eliminated by axial compression, so that the gap at the joint of each component is 0.

Description

Assembly method of driven shaft device of main transmission mechanism of seamless steel tube cold rolling mill Technical Field The invention relates to cold rolling production equipment for producing seamless steel pipes in metallurgical and mechanical industries, in particular to an assembly method of a driven shaft device of a main transmission mechanism of a seamless steel pipe cold rolling mill, which is particularly suitable for precision assembly operation of the driven shaft device adopting a crank connecting rod structure under an off-line working condition. Background The seamless steel tube is a common metallurgical metal product, and the cold rolling technology of the seamless steel tube has become a main mode of manufacturing and processing the seamless steel tube at present due to the characteristics of high rolling precision, high speed, high productivity, high yield, easy adjustment of production organization and process technology and the like. The seamless steel tube cold rolling production equipment is divided into a two-roller type cold rolling mill and a multi-roller type cold rolling mill according to the number of rollers, wherein the two-roller periodic cold rolling mill is the most widely applied seamless steel tube cold rolling mill due to the characteristics of compact structure, large rolling force, high productivity and the like. The two-roller cold pilger mill is generally composed of a main transmission mechanism, a feeding and turning mechanism, a rolling mechanism, a rotary chuck mechanism, a lathe bed mechanism, a feeding (blanking) mechanism, a lubricating mechanism, a hydraulic mechanism, an electric control system and the like. The main transmission mechanism mainly comprises a machine base, a belt wheel device, a speed reducing device, a driving shaft device, a driven shaft device, a connecting rod and other parts, and is structurally characterized in that the machine base is integrally arranged in a concrete foundation pit, and the main transmission mechanism can be divided into a front type form or a rear type form according to the installation position of the machine base. The front-mounted layout is that the stand of the main transmission mechanism is arranged on the front side of the rolling mechanism, the rear-mounted layout is that the stand is arranged on the rear side of the rolling mechanism, and the front-mounted layout and the rear-mounted layout can meet the requirements of seamless steel tube transmission, and are different in that the rear-mounted layout is arranged according to the requirements of equipment installation stations. The belt wheel device is arranged on one side of the machine base and is connected with the main motor through a coupler, the speed reducing device is arranged between the belt wheel device and the machine base and is respectively connected with the belt wheel device and the driving shaft device, the driving shaft device is arranged on the machine base (at the outer side) and is connected with the speed reducing device through the coupler, and the driven shaft device is arranged on the machine base (at the inner side and is close to the rolling mechanism) and is connected with a working frame of the rolling mechanism through connecting rods arranged on eccentric gears at two sides of the driven shaft device. The driven shaft device is therefore the only power take-off component of the main transmission, in other words the final function of the main transmission, i.e. the driven shaft, drives the working frame to operate effectively. When the seamless steel tube is cold-rolled, the main motor outputs power to drive the belt wheel device to rotate, the belt wheel device transmits the rotating power to the speed reducing device, the speed reducing device is used for reducing the speed and then transmitting the rotating power to the driving shaft device through the coupler, the driving shaft device is meshed with the driven shaft device through the gears of the driving shaft device to drive the driven shaft device to rotate in the stand, at the moment, the connecting rods arranged on the eccentric gears on two sides of the driven shaft device do rotary motion (namely autorotation) around the connecting rod pins on one hand, and do rotary motion (namely revolution) around the driven shaft main shaft under the rotary action of the driven shaft on the other hand, the autorotation and revolution rotate together for one circle, so that the working stand can be driven to complete the circular horizontal reciprocating motion in the stand of the rolling mechanism, and the driven shaft device can continuously rotate for a plurality of times, namely the power required by the seamless steel tube cold-rolled. Therefore, the running accuracy and stability of the driven shaft not only influence the running quality of the main transmission mechanism, but also influence the efficiency of the whole cold rolling pipe making, so that the running accura