阅读说明：本技术 一种全悬挂四点啮合式特大型转炉安装方法 (Mounting method of full-suspension four-point meshing type super-large converter ) 是由 王敏 杨俊� 石席龙 程权民 于 2020-03-31 设计创作，主要内容包括：本发明涉及大型冶金设备的安装领域,具体是一种全悬挂四点啮合式特大型转炉安装方法；其特征是；包括转炉轴承支座垫板安装；炉前操作平台结构框架主梁安装完毕；轴承支座安装；托圈耳轴轴承及轴承座装配；托圈吊装；炉壳吊装；倾动装置传动机构装入耳轴；转炉整体滑移；完成炉体安装；切向键装配；用切割机进行打磨,确认端盖与键的间隙为零。本发明在原有大型转炉设备顶推安装法上进行了优化改进,优点是减少传统特大型转炉“顶推安装法”中上、下炉壳“翻身”过程中出现的安全、质量隐患,使转炉安装更科学、更安全、更经济。(The invention relates to the field of installation of large metallurgical equipment, in particular to a method for installing a full-suspension four-point meshing type super-large converter; it is characterized in that; mounting a converter bearing support base plate; finishing the installation of the main beam of the structural frame of the operation platform in front of the furnace; mounting a bearing support; assembling a trunnion bearing and a bearing seat of the trunnion ring; hoisting a backing ring; hoisting a furnace shell; the transmission mechanism of the tilting device is arranged in the trunnion; the converter integrally slides; the furnace body installation is completed; assembling a tangential key; and (5) polishing by using a cutting machine, and confirming that the gap between the end cover and the key is zero. The invention is optimized and improved on the original pushing installation method of large-scale converter equipment, and has the advantages of reducing the potential safety and quality hazards in the process of turning over the upper and lower furnace shells in the traditional 'pushing installation method' of the oversize converter, and ensuring that the converter is installed more scientifically, safely and economically.)

1. A mounting method of a full-suspension four-point meshing type super-huge converter is characterized in that; comprises that

Step 1, early preparation;

step 1.1, basic handover acceptance, center target plate and elevation datum point burying and measuring;

step 1.2, checking and retesting the center distance, the verticality and the elevation of the foundation bolt;

step 1.3, mounting a converter bearing support base plate;

step 1.4, the special inspection and acceptance of the charging cross 450/80t metallurgical bridge crane are completed, and the plant is closed;

step 1.5, dismantling a charging cross 450/80t metallurgical bridge crane hook, and designing and manufacturing a support;

step 1.6, finishing the installation of a main beam of a structural frame of a furnace front operation platform with a charging span of +11.35 m;

step 2, mounting a bearing support;

step 2.1, hoisting the bearing support to a converter foundation by using a truck crane, and adjusting the elevation of the upper surface of the equipment base, the longitudinal and transverse center line A, B, the levelness D, E, the support intervals L1 and L2 and the deviation of the diagonals L3 and L4 of the two bases according to the requirements of installation specifications so as to enable the bearing support to meet the installation requirements;

step 2.2, 11.35m furnace front platform installation and sliding beam support foundation construction

The main beam of the structural frame of the operating platform in front of the furnace with the charging span of +11.35m is completely installed, and partial secondary beams and structures are not installed first, and no area is installed; the converter integrally moves on the sliding beam in a traversing way, the supporting structure for installing the sliding beam has strong stability, the stand column is arranged to increase the rigidity of the beam, the design of civil engineering and steel structure of a platform in front of the converter is combined to carry out individual deepened design and optimization, the civil engineering cushion cap foundation widening and thickening measures and the steel structure are utilized to increase the sliding beam sliding stand column, and the sliding tracks are arranged at the driving end and the moving end, so that the integral sliding of the converter is ensured; throwing parallel lines of a longitudinal central line and a transverse central line of the converter on the sliding beam by using a theodolite;

step 2.3, assembling a trunnion bearing and a bearing seat of the backing ring: assembling by heating the bearing;

the principle is that the diameter of a bearing hole is expanded to a certain value by heating the bearing, and the bearing is arranged in a trunnion matched with the bearing hole;

step 2.3.1, calculating the heating temperature of the bearing: after the trunnion and the bearing reach the site, firstly measuring the interference magnitude of the trunnion and the bearing, wherein in order to ensure that the hot-charging operation is convenient and reliable, the heating temperature is required to ensure that the expansion magnitude of the hole reaches about 2-3 times of the actually measured interference magnitude or the interference magnitude is added with a gap of 0.2-0.4 mm, and the highest temperature of the heating oil is not more than 110 ℃;

heating calculation formula:

in the formula: t- -heating temperature; i-actually measuring interference magnitude mm; k- -coefficient of expansion of the heating material 1/deg.C; d-the matching diameter is mm; t0- -ambient temperature

Step 2.3.2, assembling the bearing and the trunnion: before heating the bearing, firstly installing components such as a bearing spacer ring, a dust ring, a sealing gasket and the like on the inner side of the trunnion, carefully checking a drawing, confirming the qualification and heating the bearing after no leakage exists; respectively manufacturing a tool for hot-mounting a bearing on a transmission side and a bearing on a non-transmission side by using [14 channel steel, clamping and fixing the bearing, taking the heated bearing out of an oil tank by using an 450/80t bridge crane, turning the bearing by 90 degrees by using a manual hoist to enable the end surface of the bearing to be vertical to the ground, then stably moving the 450/80t bridge crane to enable an inner hole of the bearing to be aligned with a trunnion, respectively mounting the bearing on the trunnion on the rotation side and the trunnion on the free side, mounting a spacer ring, a sealing gasket and a dust ring on the inner side of the trunnion before mounting the bearing, and finally assembling a bearing support, a sealing ring, a sealing cover, a spacer ring and a bearing fixer;

step 2.4, lifting the backing ring

(1) After the trunnion ring is on site, placing the trunnion ring on a ground steel pier, and assembling the trunnion bearing;

(2) assembling bearing seats on the transmission side and the non-transmission side in place on the ground;

(3) hoisting the trunnion ring with the installed bearing seat to the sliding beam;

(4) turning the backing ring for 180 degrees, and installing the hanging device on the backing ring according to the correct installation position;

(5) welding and fixing the trunnion ring and the bearing seat by using an auxiliary support measure so as to prevent the trunnion ring from tipping;

hoisting the steel wire rope by using 4 fiber core steel wire rope lifting lugs with the diameter of phi 90mm (6 x 37), wherein the tensile strength is 1770 MPa, and the length is 16 m;

step 2.5, hoisting the furnace shell

(1) Dismantling a plate hook of a 480t/80t heavy metallurgy bridge crane, and installing a converter shell hoisting support on a balance beam shaft sleeve of the 480t/80t heavy metallurgy bridge crane;

(2) the other end of the converter shell hoisting support is fixed at a water-cooled furnace mouth of the converter shell by using an M80 large hexagon bolt;

(3) a balancing beam shaft sleeve of a 480t/80t heavy metallurgy bridge crane is matched with a hoisting support, and the converter is integrally sleeved in a backing ring;

step 2.6, the tilting device transmission mechanism is installed into the trunnion

The hoisting steel wire rope adopts a phi 90mm (6 x 37) fiber core steel wire rope, the tensile strength is 1770 MPa, the hoisting is carried out at 4 points, and the length is 8 m;

2.7, sliding the converter integrally;

(1) the furnace body slides, two sliding beams are respectively provided with an electric hydraulic jack push top and a chain block traction bearing seat, and the two bearing seats synchronously and stably slide in the sliding process;

(2) after the furnace body slides in place, arranging hydraulic jacks on two sides of the two bearing supports respectively, synchronously jacking the two bearing supports, stably lifting the whole furnace body, removing the sliding plate, cleaning the joint surface of the bearing supports and the bearing supports, installing a positioning pin, synchronously and stably descending the jacks, aligning the assembly marks of the bearing supports and the bearing supports, checking the installation quality, fastening a connecting bolt, and finishing the installation of the furnace body;

step 2.8, assembling the tangential key; the sizes of two key groove wide edges B are measured and checked by an inside micrometer and a dial indicator and a gauge stand respectively, and it is confirmed that B2 and B1 are equal, namely, the working surfaces of the hole grooves are parallel, and the non-parallel holes can cause the variation of interference; the processed movable key and the inclined plane of the static key are subjected to painting inspection outside the hole again to prevent the inclined plane of the movable key from being scratched in the processing and cutting process, otherwise, the movable key and the inclined plane of the static key are subjected to coping;

and hoisting the tangential key by a crane, loading the key into the key groove, impacting by a heavy traveling hammer of about 0.2t, cutting off redundant parts at a specified position, polishing by a cutting machine, and confirming that the gap between the end cover and the key is zero.

Technical Field

The invention relates to the field of installation of large metallurgical equipment, in particular to a method for installing a full-suspension four-point meshing type super-large converter.

Background

In-process, reinforced metallurgical bridge crane strides hoists alone to the trunnion ring in to last furnace shell, set up anti-tilt device, recycle reinforced metallurgical bridge crane strides and carries out whole 180 stands up to trunnion ring and last furnace shell, it is fixed, at last the lower stove outer covering of hoist and mount again, group is right on the trunnion ring, the alignment is upper, lower stove outer covering, control welding seam misalignment deviation, utilize sliding beam and synchronous hydraulic jack to carry out the whole slip to the trunnion ring at last, the stove outer covering, tilting device, whole process of sliding, the operation is fairly simple, but also has the shortcoming: 1. the whole furnace shell turning process is relatively complex, and the furnace shell turning process is frequently used for a charging cross-metallurgy bridge crane; 2. the upper furnace shell and the lower furnace shell are assembled in the high altitude, and a temporary safety measure platform is required to be built to ensure the safe welding of the furnace shells; 3. in the aspect of quality, the upper furnace shell and the lower furnace shell are assembled at high altitude, the deviation of the staggered joints is difficult to control, and the welding quality of the furnace shells is higher in requirement and needs 100% detection by an air gouging back chipping and an ultrasonic pen, so that the assembling and welding quality of the high altitude furnace shells is difficult to control.

Disclosure of Invention

The invention aims to overcome the defects and provide a safe, reliable and efficient mounting method of a full-suspension four-point meshing type super-large converter.

In order to achieve the above object, the present invention is realized by:

a method for installing a full-suspension four-point meshing type super-large converter comprises

Step 1, early preparation;

step 1.1, basic handover acceptance, center target plate and elevation datum point burying and measuring;

step 1.2, checking and retesting the center distance, the verticality and the elevation of the foundation bolt;

step 1.3, mounting a converter bearing support base plate;

step 1.4, the special inspection and acceptance of the charging cross 450/80t metallurgical bridge crane are completed, and the plant is closed;

step 1.5, dismantling a charging cross 450/80t metallurgical bridge crane hook, and designing and manufacturing a support;

step 1.6, finishing the installation of a main beam of a structural frame of a furnace front operation platform with a charging span of +11.35 m;

step 2, mounting a bearing support;

step 2.1, hoisting the bearing support to a converter foundation by using a truck crane, and adjusting the elevation of the upper surface of the equipment base, the longitudinal and transverse center line A, B, the levelness D, E, the support intervals L1 and L2 and the deviation of the diagonals L3 and L4 of the two bases according to the requirements of installation specifications so as to enable the bearing support to meet the installation requirements;

step 2.2, 11.35m furnace front platform installation and sliding beam support foundation construction

The main beam of the structural frame of the operating platform in front of the furnace with the charging span of +11.35m is completely installed, and partial secondary beams and structures are not installed first, and no area is installed; the converter integrally moves on the sliding beam in a traversing way, the supporting structure for installing the sliding beam has strong stability, the stand column is arranged to increase the rigidity of the beam, the design of civil engineering and steel structure of a platform in front of the converter is combined to carry out individual deepened design and optimization, the civil engineering cushion cap foundation widening and thickening measures and the steel structure are utilized to increase the sliding beam sliding stand column, and the sliding tracks are arranged at the driving end and the moving end, so that the integral sliding of the converter is ensured; throwing parallel lines of a longitudinal central line and a transverse central line of the converter on the sliding beam by using a theodolite;

step 2.3, assembling a trunnion bearing and a bearing seat of the backing ring: the assembly is carried out by heating the bearing. The principle is that the diameter of the bearing hole is expanded to a certain value by heating the bearing, and the bearing is installed in a trunnion matched with the bearing hole.

Step 2.3.1, calculating the heating temperature of the bearing: after the trunnion and the bearing reach the site, firstly measuring the interference magnitude of the trunnion and the bearing, wherein in order to ensure that the hot-charging operation is convenient and reliable, the heating temperature is required to ensure that the expansion magnitude of the hole reaches about 2-3 times of the actually measured interference magnitude or the interference magnitude is added with a gap of 0.2-0.4 mm, and the highest temperature of the heating oil is not more than 110 ℃;

heating calculation formula:

in the formula: t- -heating temperature; i-actually measuring interference magnitude mm; k- -coefficient of expansion of the heating material 1/deg.C; d-the matching diameter is mm; t0- -ambient temperature

Step 2.3.2, assembling the bearing and the trunnion: before heating the bearing, firstly installing components such as a bearing spacer ring, a dust ring, a sealing gasket and the like on the inner side of the trunnion, carefully checking a drawing, confirming the qualification and heating the bearing after no leakage exists; respectively manufacturing a tool for hot-mounting a bearing on a transmission side and a bearing on a non-transmission side by using [14 channel steel, clamping and fixing the bearing, taking the heated bearing out of an oil tank by using an 450/80t bridge crane, turning the bearing by 90 degrees by using a manual hoist to enable the end surface of the bearing to be vertical to the ground, then stably moving the 450/80t bridge crane to enable an inner hole of the bearing to be aligned with a trunnion, respectively mounting the bearing on the trunnion on the rotation side and the trunnion on the free side, mounting a spacer ring, a sealing gasket and a dust ring on the inner side of the trunnion before mounting the bearing, and finally assembling a bearing support, a sealing ring, a sealing cover, a spacer ring and a bearing fixer;

step 2.4, lifting the backing ring

(1) After the trunnion ring is on site, placing the trunnion ring on a ground steel pier, and assembling the trunnion bearing;

(2) assembling bearing seats on the transmission side and the non-transmission side in place on the ground;

(3) hoisting the trunnion ring with the installed bearing seat to the sliding beam;

(4) turning the backing ring for 180 degrees, and installing the hanging device on the backing ring according to the correct installation position;

(5) welding and fixing the trunnion ring and the bearing seat by using an auxiliary support measure so as to prevent the trunnion ring from tipping;

hoisting the steel wire rope by using 4 fiber core steel wire rope lifting lugs with the diameter of phi 90mm (6 x 37), wherein the tensile strength is 1770 MPa, and the length is 16 m;

step 2.5, hoisting the furnace shell

(1) Dismantling a plate hook of a 480t/80t heavy metallurgy bridge crane, and installing a converter shell hoisting support on a balance beam shaft sleeve of the 480t/80t heavy metallurgy bridge crane;

(2) the other end of the converter shell hoisting support is fixed at a water-cooled furnace mouth of the converter shell by using an M80 large hexagon bolt;

(3) a balancing beam shaft sleeve of a 480t/80t heavy metallurgy bridge crane is matched with a hoisting support, and the converter is integrally sleeved in a backing ring;

step 2.6, the tilting device transmission mechanism is installed into the trunnion

The hoisting steel wire rope adopts a phi 90mm (6 x 37) fiber core steel wire rope, the tensile strength is 1770 MPa, the hoisting is carried out at 4 points, and the length is 8 m;

2.7, sliding the converter integrally;

(1) the furnace body slides, two sliding beams are respectively provided with an electric hydraulic jack push top and a chain block traction bearing seat, and the two bearing seats synchronously and stably slide in the sliding process;

(2) after the furnace body slides in place, arranging hydraulic jacks on two sides of the two bearing supports respectively, synchronously jacking the two bearing supports, stably lifting the whole furnace body, removing the sliding plate, cleaning the joint surface of the bearing supports and the bearing supports, installing a positioning pin, synchronously and stably descending the jacks, aligning the assembly marks of the bearing supports and the bearing supports, checking the installation quality, fastening a connecting bolt, and finishing the installation of the furnace body;

step 2.8, assembling the tangential key; the sizes of two key groove wide edges B are measured and checked by an inside micrometer and a dial indicator and a gauge stand respectively, and it is confirmed that B2 and B1 are equal, namely, the working surfaces of the hole grooves are parallel, and the non-parallel holes can cause the variation of interference; the processed movable key and the inclined plane of the static key are subjected to painting inspection outside the hole again to prevent the inclined plane of the movable key from being scratched in the processing and cutting process, otherwise, the movable key and the inclined plane of the static key are subjected to coping. And hoisting the tangential key by a crane, loading the key into the key groove, impacting by a heavy traveling hammer of about 0.2t, cutting off redundant parts at a specified position, polishing by a cutting machine, and confirming that the gap between the end cover and the key is zero.

The invention is optimized and improved on the original pushing installation method of large-scale converter equipment, and has the advantages of reducing the potential safety and quality hazards in the process of turning over the upper and lower furnace shells in the traditional 'pushing installation method' of the oversize converter, and ensuring that the converter is installed more scientifically, safely and economically.

Detailed Description

The invention is further illustrated by the following specific examples.

A method for installing a full-suspension four-point meshing type super-large converter comprises

Step 1, early preparation;

step 1.1, basic handover acceptance, center target plate and elevation datum point burying and measuring;

step 1.2, checking and retesting the center distance, the verticality and the elevation of the foundation bolt;

step 1.3, mounting a converter bearing support base plate;

step 1.4, the special inspection and acceptance of the charging cross 450/80t metallurgical bridge crane are completed, and the plant is closed;

step 1.5, dismantling a charging cross 450/80t metallurgical bridge crane hook, and designing and manufacturing a support;

step 1.6, finishing the installation of a main beam of a structural frame of a furnace front operation platform with a charging span of +11.35 m;

step 2, mounting a bearing support;

step 2.1, hoisting the bearing support to a converter foundation by using a truck crane, and adjusting the elevation of the upper surface of the equipment base, the longitudinal and transverse center line A, B, the levelness D, E, the support intervals L1 and L2 and the deviation of the diagonals L3 and L4 of the two bases according to the requirements of installation specifications so as to enable the bearing support to meet the installation requirements;

step 2.2, 11.35m furnace front platform installation and sliding beam support foundation construction

The main beam of the structural frame of the operating platform in front of the furnace with the charging span of +11.35m is completely installed, and partial secondary beams and structures are not installed first, and no area is installed; the converter integrally moves on the sliding beam in a traversing way, the supporting structure for installing the sliding beam has strong stability, the stand column is arranged to increase the rigidity of the beam, the design of civil engineering and steel structure of a platform in front of the converter is combined to carry out individual deepened design and optimization, the civil engineering cushion cap foundation widening and thickening measures and the steel structure are utilized to increase the sliding beam sliding stand column, and the sliding tracks are arranged at the driving end and the moving end, so that the integral sliding of the converter is ensured; throwing parallel lines of a longitudinal central line and a transverse central line of the converter on the sliding beam by using a theodolite;

step 2.3, assembling a trunnion bearing and a bearing seat of the backing ring: the assembly is carried out by heating the bearing. The principle is that the diameter of the bearing hole is expanded to a certain value by heating the bearing, and the bearing is installed in a trunnion matched with the bearing hole.

Step 2.3.1, calculating the heating temperature of the bearing: after the trunnion and the bearing reach the site, firstly measuring the interference magnitude of the trunnion and the bearing, wherein in order to ensure that the hot-charging operation is convenient and reliable, the heating temperature is required to ensure that the expansion magnitude of the hole reaches about 2-3 times of the actually measured interference magnitude or the interference magnitude is added with a gap of 0.2-0.4 mm, and the highest temperature of the heating oil is not more than 110 ℃;

heating calculation formula:

in the formula: t- -heating temperature; i-actually measuring interference magnitude mm; k- -coefficient of expansion of the heating material 1/deg.C; d-the matching diameter is mm; t0- -ambient temperature

Step 2.3.2, assembling the bearing and the trunnion: before heating the bearing, firstly installing components such as a bearing spacer ring, a dust ring, a sealing gasket and the like on the inner side of the trunnion, carefully checking a drawing, confirming the qualification and heating the bearing after no leakage exists; respectively manufacturing a tool for hot-mounting a bearing on a transmission side and a bearing on a non-transmission side by using [14 channel steel, clamping and fixing the bearing, taking the heated bearing out of an oil tank by using an 450/80t bridge crane, turning the bearing by 90 degrees by using a manual hoist to enable the end surface of the bearing to be vertical to the ground, then stably moving the 450/80t bridge crane to enable an inner hole of the bearing to be aligned with a trunnion, respectively mounting the bearing on the trunnion on the rotation side and the trunnion on the free side, mounting a spacer ring, a sealing gasket and a dust ring on the inner side of the trunnion before mounting the bearing, and finally assembling a bearing support, a sealing ring, a sealing cover, a spacer ring and a bearing fixer;

step 2.4, lifting the backing ring

(1) After the trunnion ring is on site, placing the trunnion ring on a ground steel pier, and assembling the trunnion bearing;

(2) assembling bearing seats on the transmission side and the non-transmission side in place on the ground;

(3) hoisting the trunnion ring with the installed bearing seat to the sliding beam;

(4) turning the backing ring for 180 degrees, and installing the hanging device on the backing ring according to the correct installation position;

(5) welding and fixing the trunnion ring and the bearing seat by using an auxiliary support measure so as to prevent the trunnion ring from tipping;

hoisting the steel wire rope by using 4 fiber core steel wire rope lifting lugs with the diameter of phi 90mm (6 x 37), wherein the tensile strength is 1770 MPa, and the length is 16 m;

step 2.5, hoisting the furnace shell

(1) Dismantling a plate hook of a 480t/80t heavy metallurgy bridge crane, and installing a converter shell hoisting support on a balance beam shaft sleeve of the 480t/80t heavy metallurgy bridge crane;

(2) the other end of the converter shell hoisting support is fixed at a water-cooled furnace mouth of the converter shell by using an M80 large hexagon bolt;

(3) a balancing beam shaft sleeve of a 480t/80t heavy metallurgy bridge crane is matched with a hoisting support, and the converter is integrally sleeved in a backing ring;

step 2.6, the tilting device transmission mechanism is installed into the trunnion

The hoisting steel wire rope adopts a phi 90mm (6 x 37) fiber core steel wire rope, the tensile strength is 1770 MPa, the hoisting is carried out at 4 points, and the length is 8 m;

2.7, sliding the converter integrally;

(1) the furnace body slides, two sliding beams are respectively provided with an electric hydraulic jack push top and a chain block traction bearing seat, and the two bearing seats synchronously and stably slide in the sliding process;

(2) after the furnace body slides in place, arranging hydraulic jacks on two sides of the two bearing supports respectively, synchronously jacking the two bearing supports, stably lifting the whole furnace body, removing the sliding plate, cleaning the joint surface of the bearing supports and the bearing supports, installing a positioning pin, synchronously and stably descending the jacks, aligning the assembly marks of the bearing supports and the bearing supports, checking the installation quality, fastening a connecting bolt, and finishing the installation of the furnace body;

step 2.8, assembling the tangential key; the sizes of two key groove wide edges B are measured and checked by an inside micrometer and a dial indicator and a gauge stand respectively, and it is confirmed that B2 and B1 are equal, namely, the working surfaces of the hole grooves are parallel, and the non-parallel holes can cause the variation of interference; the processed movable key and the inclined plane of the static key are subjected to painting inspection outside the hole again to prevent the inclined plane of the movable key from being scratched in the processing and cutting process, otherwise, the movable key and the inclined plane of the static key are subjected to coping. And hoisting the tangential key by a crane, loading the key into the key groove, impacting by a heavy traveling hammer of about 0.2t, cutting off redundant parts at a specified position, polishing by a cutting machine, and confirming that the gap between the end cover and the key is zero.

The invention is optimized and improved on the original pushing installation method of large-scale converter equipment, and has the advantages of reducing the potential safety and quality hazards in the process of turning over the upper and lower furnace shells in the traditional 'pushing installation method' of the oversize converter, and ensuring that the converter is installed more scientifically, safely and economically.