阅读说明：本技术 更换钢包回转台上曲柄内侧关节轴承及销轴的施工方法 (Construction method for replacing joint bearing and pin shaft on inner side of crank on ladle turret ) 是由 张伟红 张立杰 陈树锋 于 2020-11-10 设计创作，主要内容包括：一种更换钢包回转台上曲柄内侧关节轴承及销轴的施工方法,属于炼钢连铸机钢包回转台部件更换技术领域。施工步骤包括：停机前制作好工装,停机后拆除隔热板,对钢包回转台的1#2#叉臂和上曲柄进行封固,在更换关节轴承及销轴的位置安装临时操作平台,在上曲柄和支座之间制作安装安全联锁机构,更换关节轴承和销轴。优点在于,解决了炼钢连铸机钢包回转台更换上曲柄内侧关节轴承及销轴时需要使用上料和浇铸两跨的桥式起重机、施工时间长、占用场地大、施工成本高、对生产影响大的问题。为施工的顺利进行提供了时间上的保证,大大降低了施工成本,缩短了施工时间,减少了对生产的影响。(A construction method for replacing a joint bearing and a pin shaft on the inner side of a crank on a ladle turret belongs to the technical field of replacement of components of the ladle turret of a steelmaking continuous casting machine. The construction steps comprise: the tool is manufactured before the machine is stopped, the heat insulation plate is removed after the machine is stopped, the No. 1 No. 2 fork arm and the upper crank of the ladle turret are sealed, a temporary operating platform is installed at the position where the joint bearing and the pin shaft are replaced, a safety interlocking mechanism is manufactured and installed between the upper crank and the support, and the joint bearing and the pin shaft are replaced. The steel ladle rotary table has the advantages that the problems that a bridge crane with two spans of feeding and casting is needed when the upper crank inner side knuckle bearing and the pin shaft are replaced on the steel ladle rotary table of the steelmaking continuous casting machine, the construction time is long, the occupied space is large, the construction cost is high, and the production influence is large are solved. The method provides a guarantee in time for the smooth construction, greatly reduces the construction cost, shortens the construction time and reduces the influence on the production.)

1. A construction method for replacing a joint bearing and a pin shaft on the inner side of a crank on a ladle turret is characterized by comprising the following specific process steps and technical parameters of control:

1) tooling manufacturing

The used tool comprises a fork arm supporting upright post (1), a self-locking mechanism (2), a cross top shaft frame (3), a fixed pile (4) and an inner side lead screw (5), wherein an outer side lead screw (6) and a top sliding door type frame (8) are manufactured before shutdown maintenance; during manufacturing, lofting and material marking are carried out according to the size of a design drawing in a ratio of 1: 1; the cutting of the steel plate adopts a semi-automatic cutting machine, and the cutting of the section bar adopts gas cutting, so that the cut material is ensured not to be distorted and deformed; the assembly sequence of the tool is that all parts of the tool are stuck together in a spot welding mode, full welding is carried out on all connecting parts, when hidden welding seams are met, welding is carried out firstly, and the next procedure can be carried out after the hidden welding seams are inspected to be qualified; welding of the components is carried out strictly according to a welding operation instruction, and welding stress and welding deformation are reduced by reasonably arranging a welding sequence and adopting a rigid fixing method; the inner lead screw (5) and the outer lead screw (6) are processed according to a design drawing, and Q275 high-quality carbon steel is used as a material;

2) the first heat insulation protective plate (9) and the second heat insulation plate (18) are removed

The method comprises the steps that a ladle cover (10) is detached after the machine is stopped, a ladle (11) is hoisted away, a No. 1 fork arm (13) of a ladle rotary table (12) is rotated and stopped at a casting position, a pouring bridge-spanning type crane (14) is used for cooperatively detaching a first heat insulation protection plate (9) on the No. 1 fork arm (13) and an upper crank (15), the ladle rotary table (12) is rotated 180 degrees, and a second heat insulation protection plate (18) on a No. 2 fork arm (16) and an upper crank (17) are detached in the same method;

3) fixing of 1# fork arm (13), 2# fork arm (16), upper crank I (15) and upper crank II (17)

The ladle turret (12) rotates and stops at a waiting position, and the No. 1 fork arm (13) and the No. 2 fork arm (16) are lifted to the horizontal position by using the ladle lifting hydraulic cylinder I (19) and the ladle lifting hydraulic cylinder II (20); firstly, supporting and fixing an upper crank I (15) and an upper crank II (17) of a ladle turret (12) by using ejector rods (21) of the upper crank I (15) and the upper crank II (17), then supporting and fixing a 1# fork arm (13) and a 2# fork arm (16) by using four supporting upright columns (1) and four 100t jacks (22), in order to ensure construction safety, supporting and fixing a position between the upper crank I (15) and the upper crank II (17) and a turntable support (23) and a position between a lower connecting rod (24) and a turntable (25) by using a fixed pile (4), in the installation process of the fixed pile (4), using two inclined sizing blocks (26) for compaction, using the four 100 jacks (22) for finely adjusting the upper and lower positions of the 1# fork arm (13) and the 2# fork arm (16) when a pin shaft (27) is dismounted and installed, and driving a fine adjustment pin hole of the upper crank I (15) and the upper crank II (17), the assembly and disassembly of the pin shaft (27) are smoother;

4) manufacturing and installation of temporary operating platform (28) for disassembling and installing pin shaft (27)

The length of a temporary operating platform (28) for dismounting and mounting the pin shaft (27) is 1800mm, the width of the temporary operating platform is 1400mm, the temporary operating platform is connected with the ladle turret (12) by bolts as much as possible, important positions are avoided when welding is necessary, a frame of the temporary operating platform (28) uses 10# I-steel, the bottom surface of the temporary operating platform uses a pattern steel plate with the thickness of 3mm, rails use welded steel pipes of DN20, and the height of the rails is not less than 1200 mm;

5) installation of self-locking mechanism (2)

The left and right sides of the cross bar of an upper crank I (15) and an upper crank II (17) of which the joint bearing I (29), the joint bearing II (30) and the pin shaft (27) are required to be replaced and the turntable support (23) are welded with the self-locking mechanisms (2), and the total number of the four groups is four; when the self-locking mechanism (2) is designed, 5mm regulating quantities are respectively arranged in four directions of an upper crank I (15) and an upper crank II (17) after the self-locking mechanism (2) is installed;

6) the dismounting method comprises the following steps of dismounting a connecting bolt (35) of a bearing end cover I (31), a bearing end cover II (32), a bearing bush I (33), a bearing bush II (34), a joint bearing I (29), a joint bearing II (30) and a pin shaft (27), dismounting the bearing end cover I (31) and the bearing bush I (33), mounting an inner lead screw (5), an outer lead screw (6), a cross top shaft frame (3) and a 50t hydraulic jack (7), and sequentially jacking and dismounting the bearing bush I (33), the joint bearing I (29) and the pin shaft (27) by utilizing the 50t hydraulic jack (7) between the two cross top shaft frames (3). If a large flaw is worn between the pin shaft (27) and the contact surfaces of the first joint bearing (29) and the second joint bearing (30), when the first joint bearing (29) and the pin shaft (27) cannot be removed by traction through the jacking force of the 50t hydraulic jack (7), firstly removing the second bearing end cover (32) and the second bearing bushing (34) by the method, then installing the prefabricated top-pull door-shaped frame (8) on the rotary table support (23) on the side of the first bearing end cover (31), aligning the center of the pin shaft (27) when the top-pull door-shaped frame (8) is installed, finally erecting a 200t hydraulic jack (37), and ejecting the pin shaft (27) through the top-pull door-shaped frame (8) by using the 200t hydraulic jack (37);

7) replacing knuckle bearing I (29) and knuckle bearing II (30)

After the pin shaft (27) is removed, the inner lead screw (5), the outer lead screw (6) and the cross top shaft frame (3) and the 50t hydraulic jack (7) are used for removing the joint bearing II (30), because the joint bearing I (29) and the joint bearing II (30) of the steel ladle rotary table (12) are spherical bearings, the inner and outer rings of the joint bearing I (29) and the joint bearing II (30) move freely, and a small external force can cause the inner rings of the joint bearing I (29) and the joint bearing II (30) to swing greatly, great difficulty is brought to the installation of the pin shaft (27), therefore, a welding stop block is adopted to fix the inner rings of the joint bearing I (29) and the joint bearing II (30) before the new joint bearing I (29) and the joint bearing II (30) are installed again, the joint bearing I (29) and the joint bearing II (30) are prevented from swinging freely when the pin shaft (27) is installed again, and the inner lead screw (5) and the outer lead screw are used after the bearing positions of the joint bearing I (29) and the joint bearing II (30) The side screw (6), the cross top shaft frame (3) and the 50t hydraulic jack (7) press the joint bearing I (29) and the joint bearing II (30) into the bearing position;

8) pin shaft (27), bearing bush I (33), bearing bush II (34), bearing end cover I (31) and bearing end cover II (32) are installed again

The first bearing end cover (31), the second bearing end cover (32), the first bearing bush (33), the second bearing bush (34) and the pin shaft are installed and removed in reverse order, when the pin shaft (27) is installed again, the two bearing holes of the first joint bearing (29) and the second joint bearing (30) are aligned with the four holes of the first bearing bush (33) and the second bearing bush (34) on the turntable support (23), and the pin shaft (27) is pressed into the holes in a mode opposite to the removal; centering and aligning the pin shaft (27) based on two bushing holes of the bearing bushing I (33) and the bearing bushing II (34), and aligning the bearing bushing I (33) and the bearing bushing II (34) and the bearing end cover I (31) and the bearing end cover II (32) by a method opposite to the dismounting method.

2. The construction method for replacing the crank inner side joint bearing and the pin shaft on the ladle turret according to claim 1, wherein the fork arm support upright post (1), the self-locking mechanism (2), the cross top shaft bracket (3), the fixing pile (4), the inner side lead screw (5), the outer side lead screw (6) and the top sliding door type frame (8) are manufactured before shutdown and maintenance.

3. The construction method for replacing the knuckle bearing and the pin shaft on the inner side of the crank on the ladle turret according to claim 1, wherein the upper crank I (15) and the upper crank II (17) in the step 3) are supported by fixing piles (4) between the turntable support (23) and between the lower connecting rod (24) and the turntable rotator (25).

Technical Field

The invention belongs to the technical field of replacement of components of a ladle turret of a steelmaking continuous casting machine, and particularly relates to a construction method for replacing a crank inner side joint bearing and a pin shaft on a ladle turret, namely a construction method for replacing the crank inner side joint bearing and the pin shaft on the ladle turret by a sealing fine adjustment method, which is suitable for construction projects of replacement of the crank inner side joint bearing and the pin shaft of the ladle turret of the steelmaking continuous casting machine with complicated construction environments, large construction condition limitation and high disassembly and hoisting difficulty.

Background

The steel ladle rotary table of the steelmaking continuous casting machine is provided with two sets of steel ladle lifting mechanisms, each steel ladle lifting mechanism consists of an upper crank, a fork arm, a lower connecting rod, a rotary table revolving body and a fork arm oil cylinder, the four parts of the upper crank, the fork arm, the lower connecting rod and the rotary table revolving body are connected into a four-connecting-rod mechanism through joint bearings and pin shafts, and the four-connecting-rod mechanism lifts the upper crank through the fork arm oil cylinder to realize horizontal lifting of a steel ladle. The upper crank is located at the uppermost part of the ladle turret, the weight of the single body is 45t, the pin shaft of the inner side joint bearing is simultaneously connected with the joint bearing at the inner side of the other upper crank, namely the inner side joint bearing at one side of the two upper cranks is connected with the turret support through a common pin shaft, when one upper crank inner side joint bearing and the pin shaft are replaced, the joint bearing at the inner side of the other upper crank corresponding to the upper crank inner side joint bearing and the pin shaft needs to be replaced together, therefore, the replacement of the upper crank inner side joint bearing and the pin shaft is a construction project with the largest difficulty, the longest time and the highest risk in the replacement construction of all joint bearings and pin shafts of the ladle turret, and the progress, the.

The ladle turret is mainly used for turning a heavy ladle for casting from a feeding straddle casting position to a casting straddle casting position, and turning an empty ladle from the casting straddle casting position to the feeding straddle casting position after casting. The weight of the ladle turret is 276.5t, and the ladle turret is arranged right below a common track beam of a feeding and casting two-span bridge crane on a +12860mm platform, so that the hoisting operation of overhauling, dismounting and mounting of each part of the ladle turret is not within the operation range of the feeding and casting two-span bridge crane; the height of the top elevation of the ladle turret when the fork arm is lowered to the lowest point after the ladle turret is installed is +23076mm, the height of the bottom elevation of the two-span public bridge crane beam is +25030mm, the distance between the top surface of the equipment and the bottom surface of the bridge crane track beam is only 1954mm, and the hoisting operation difficulty during construction and installation is large.

The traditional construction method is that the joint bearing and the pin shaft on the inner side of the crank on the ladle turret are replaced by an integral sealing and top-down double-vehicle lifting and hoisting dismounting method: firstly, manufacturing a 12000mm long shoulder pole beam; secondly, dismantling the heat insulation guard plate; thirdly, sealing and fixing a fork arm, a lower connecting rod and an upper crank of the ladle turret so as to enable the fork arm, the lower connecting rod and the upper crank to be immovable; fourthly, manufacturing and installing a temporary operating platform at the position of replacing the joint bearing and the pin shaft; fifthly, using two bridge cranes with two spans of feeding and casting to lift and lift the handles on the No. 1 and No. 2 fork arms through the carrying pole beam, and replacing the joint bearing and the pin shaft; and sixthly, the crank and the heat insulation protective plate are installed back in the reverse order of the disassembly to complete the replacement. This approach has three difficulties: firstly, the method needs to occupy one bridge crane of two spans for long time during construction, which can seriously affect the production rhythm of the two spans and cause immeasurable loss to production; secondly, because the weight of each part of the ladle turret is large, a single upper crank weighs 45t, and the distance between the top surface of the equipment and the bottom surface of the track beam of the bridge crane is small, the difficulty of dismounting and hoisting operation is large, the construction period is long, and the safety risk is large; thirdly, the target joint bearing and the pin shaft can be replaced only after two upper cranks, eight sets of pin shafts and corresponding joint bearings are disassembled and installed, the engineering quantity is large, the construction difficulty is high, and the occupied space is large.

In order to save the construction time to the utmost extent under the prerequisite of guaranteeing safety and quality, reduce construction cost, decide to adopt and seal the inboard joint bearing of crank and round pin axle on the ladle turret to change by the fine setting method: firstly, manufacturing a tool before stopping the machine; secondly, detaching the heat insulation plate after stopping the machine; thirdly, sealing a No. 1 and No. 2 fork arm and an upper crank of the ladle turret; fourthly, mounting a temporary operating platform at the position of replacing the joint bearing and the pin shaft; fifthly, manufacturing and installing a safety interlocking mechanism between the upper crank and the support; and sixthly, replacing the joint bearing and the pin shaft. The method fully utilizes the existing construction conditions, completes the construction task more efficiently and quickly, and solves various problems of the traditional construction method.

Disclosure of Invention

The invention aims to provide a construction method for replacing a joint bearing and a pin shaft on the inner side of a crank on a ladle turret by a sealing fine adjustment method. The problems that a bridge crane with two spans of feeding and casting is needed when the steel ladle rotary table of the steelmaking continuous casting machine is used for replacing the knuckle bearing and the pin shaft on the inner side of the upper crank, the construction time is long, the occupied area is large, the construction cost is high, and the production influence is large are solved. The invention provides a guarantee on time for the smooth construction, greatly reduces the construction cost, shortens the construction time and reduces the influence on the production. The specific process steps and the controlled technical parameters are as follows:

1) manufacturing of tool

The used tool comprises a fork arm supporting upright post 1, a self-locking mechanism 2, a cross top shaft frame 3, a fixed pile 4 and an inner side lead screw 5, wherein an outer side lead screw 6 and a top sliding door type frame 7 need to be manufactured before shutdown maintenance; during manufacturing, lofting and material marking are carried out according to the size of a design drawing in a ratio of 1: 1; the cutting of the steel plate adopts a semi-automatic cutting machine, and the cutting of the section bar adopts gas cutting, so that the cut material is ensured not to be distorted and deformed; the assembly sequence of the tool is determined according to the structural form and the welding method of manual carbon dioxide arc welding, all parts of the tool are stuck together in a spot welding mode, full welding is carried out on all connecting parts, when hidden welding seams exist, welding is carried out firstly, and the next procedure can be carried out after the hidden welding seams are inspected to be qualified; the welding of the components is carried out strictly according to the welding operation instruction, and welding stress and welding deformation are reduced by reasonably arranging the welding sequence and adopting a rigid fixing method. The inner lead screw 5 and the outer lead screw 6 are processed strictly according to the design drawing, and Q275 high-quality carbon steel is used as the material;

2) the first heat insulation protection plate 9 and the second heat insulation plate 18 are removed

And (3) removing the ladle cover 10 after the machine is stopped, hoisting the ladle 11 away, rotating the No. 1 fork arm 13 of the ladle turret 12 to stop at a casting position, removing the first heat-insulation guard plate 9 on the No. 1 fork arm 13 and the first upper crank 15 by using a pouring bridge-type crane 14 in a matching manner, rotating the ladle turret 12 by 180 degrees, and removing the second heat-insulation guard plate 18 on the No. 2 fork arm 16 and the second upper crank 17 by using the same method.

3)1# yoke 13, 2# yoke 16 and the fixing of the upper crank I15 and the upper crank II 17

The ladle turret 12 is rotated and stopped at a waiting position, and the No. 1 fork arm 13 and the No. 2 fork arm 16 are lifted to a horizontal position by using the first ladle lifting hydraulic cylinder 19 and the second ladle lifting hydraulic cylinder 20. Firstly, the first upper crank 15 and the second upper crank 17 of the ladle turret 12 are supported and fixed by the first upper crank 15 and the second upper crank 17 through the ejector rods 21 of the first upper crank 15 and the second upper crank 17, then the 1# fork arm 13 and the 2# fork arm 16 are supported and fixed by four supporting upright posts 1 and four 100t jacks 22, in order to ensure the construction safety, the space between the first upper crank 15 and the second upper crank 17 and a turntable support 23 and the space between the lower connecting rod 24 and a turntable rotator 25 are supported and fixed by fixing piles 4, the fixing piles 4 are firmly found by two inclined sizing blocks 26 during installation, and the inclined sizing blocks 26 are tapped by a hand hammer until the inclined sizing blocks cannot shake manually. The four 100 jacks 22 are used for finely adjusting the upper and lower positions of the 1# fork arm 13 and the 2# fork arm 16 when the pin 27 is removed and installed, so that the upper crank I15 and the upper crank II 17 are driven to finely adjust pin shaft holes, and the pin 27 is more smoothly removed and installed.

4) The pin shaft 27 is disassembled and assembled to manufacture and install the temporary operating platform 28

The temporary operating platform 28 for dismounting and mounting the pin shaft 27 is 1800mm long and 1400mm wide, the manufacturing and mounting principles are that the temporary operating platform is connected with the ladle turret 12 through bolts as far as possible, important positions need to be avoided during welding, 10# I-shaped steel is used as a frame of the temporary operating platform 28, a pattern steel plate with the thickness of 3mm is used as a bottom surface, a welded steel pipe of DN20 is used as a railing, and the height of the railing is not less than 1200 mm.

5) Self-locking mechanism 2 mounting

In order to ensure that the position variation of the first upper crank 15 and the second upper crank 17 is less than 1mm after the pin shaft 27 is removed, the self-locking mechanisms 2 are welded and installed between the left and right sides of the cross rods of the first upper crank 15 and the second upper crank 17 and the turntable support 23, which need to replace the first knuckle bearing 29 and the second knuckle bearing 30 and the pin shaft 27, and four groups. When the self-locking mechanism 2 is designed, the first upper crank 15 and the second upper crank 17 are required to have 5mm regulating quantity in four directions, namely the upper direction, the lower direction, the left direction and the right direction after the self-locking mechanism 2 is installed.

6) The first bearing end cover 31, the second bearing end cover 32, the first bearing bush 33, the second bearing bush 34, the first joint bearing 29, the second joint bearing 30 and the pin shaft 27 are removed

And removing the connecting bolts 35 of the first bearing end cover 31 and the first bearing bush 33, installing the inner lead screw 5, the outer lead screw 6, the cross top shaft frames 3 and the 50t hydraulic jacks 7, and sequentially lifting and removing the first bearing bush 33, the first joint bearing 29 and the pin shaft 27 by using the 50t hydraulic jacks 7 between the two cross top shaft frames 3. If a large flaw is worn between the pin shaft 27 and the contact surfaces of the first knuckle bearing 29 and the second knuckle bearing 30, when the jacking force of the 50t hydraulic jack 7 cannot pull and remove the first knuckle bearing 29 and the pin shaft 27, the second bearing end cover 32 and the second bearing bush 34 are removed by the method, the prefabricated sliding door frame 8 is installed on the turntable support 23 on the side of the first bearing end cover 31, the center of the pin shaft 27 needs to be aligned when the sliding door frame 8 is installed, finally the 200t hydraulic jack 37 is erected, and the pin shaft 27 is ejected out through the sliding door frame 8 by the 200t hydraulic jack 37.

7) The first replacement joint bearing 29 and the second replacement joint bearing 30

After the pin shaft 27 is removed, the inner lead screw 5, the outer lead screw 6 and the cross top shaft frame 3 and 50t hydraulic jack 7 are used for removing the second oscillating bearing 30, because the first oscillating bearing 29 and the second oscillating bearing 30 of the steel ladle rotary table 12 are spherical bearings, the inner ring and the outer ring of the first oscillating bearing 29 and the second oscillating bearing 30 move freely, the inner ring of the first oscillating bearing 29 and the second oscillating bearing 30 can swing greatly due to small external force, and great difficulty is brought to the installation of the pin shaft 27, therefore, before the new first oscillating bearing 29 and the second oscillating bearing 30 are reinstalled, the inner rings of the first oscillating bearing 29 and the second oscillating bearing 30 are fixed by adopting a method of welding a stop block so as to prevent the first oscillating bearing 29 and the second oscillating bearing 30 from freely swinging when the pin shaft 27 is reinstalled, after the bearing positions of the first knuckle bearing 29 and the second knuckle bearing 30 are aligned, the first knuckle bearing 29 and the second knuckle bearing 30 are pressed into the bearing positions by the inner lead screw 5, the outer lead screw 6 and the cross top shaft frame 3 and 50t hydraulic jacks 7.

8) The pin shaft 27, the first bearing bush 33, the second bearing bush 34, the first bearing end cover 31 and the second bearing end cover 32 are installed again

The first bearing end cover 31, the second bearing end cover 32, the second bearing bush 34, the first bearing end cover 31 and the pin shaft 27 are installed back and removed in reverse order, when the pin shaft 27 is installed back, the two bearing holes of the first joint bearing 29 and the second joint bearing 30 are aligned with the four holes of the first bearing bush 33 and the two bush holes of the second bearing bush 34 on the turntable support 23, and then the pin shaft 27 is pressed into the holes in a mode opposite to the removal mode. Centering the pin 27 based on the two bushing holes of the first bearing bushing 33 and the second bearing bushing 34, and using the method opposite to the dismounting to align the first bearing bushing 33 and the second bearing bushing 34 with the first bearing end cover 31 and the second bearing end cover 32.

The fork arm supporting upright post 1, the self-locking mechanism 2, the cross top shaft frame 3, the fixing pile 4, the inner side lead screw 5, the outer side lead screw 6 and the top sliding door type frame 8 in the step 1) are required to be manufactured before shutdown and maintenance, and time guarantee is provided for production.

And (3) supporting the upper crank I15, the upper crank II 17 and the rotary table support 23 and the lower connecting rod 24 and the rotary table revolving body 25 by using the fixing piles 4, thereby providing double safety guarantee for the whole construction.

And 3) supporting and fixing the 1# fork arm 13 and the 2# fork arm 16 by using four supporting columns 1 and four 100t jacks 22, wherein the four 100 jacks 22 are used for finely adjusting the positions of the 1# fork arm 13 and the 2# fork arm 16 above and below when the pin shaft 27 is dismounted and mounted, so that the fine adjustment pin shaft holes of the first crank 15 and the second crank 17 are driven, and the pin shaft 27 is more smoothly dismounted.

And (3) in the step 5), the self-locking mechanism 2 is welded and installed between the left and right sides of the cross rods of the first knuckle bearing 29, the second knuckle bearing 30, the first upper crank 15 and the second upper crank 17 of the pin shaft 27 to be replaced and the turntable support 23, so that the upper crank cannot be turned over greatly under the action of self gravity after the pin shaft is detached, and the safety risk and the construction difficulty are reduced.

The inner lead screw 5, the outer lead screw 6 and the cross top shaft frame 3 and the 50t hydraulic jack 7 are installed in the step 6), the conditions and the current situation of the equipment are fully utilized, the parent body of the equipment is not damaged, and the operation is simple, safe and reliable.

And step 6), mounting the prefabricated top-pull door type frame 8 on the turntable support 23 on the side of the first bearing end cover 30, and ejecting the pin shaft 27 through the top-pull door type frame 8 by using a 200t hydraulic jack 37. The construction reliability is increased for the standby scheme, and the smooth completion of the construction is ensured.

The invention has the advantages that: the method is simple and easy to implement, a feeding bridge-spanning crane is not used, and the production and construction cost is reduced; large disassembly construction is not adopted, so that the occupied time of casting the bridge-crossing crane is reduced, and the construction site is saved; the sealing fine adjustment shortens the construction time and reduces the influence on production; and the safety guarantee is provided by adopting double safety facilities of partial sealing and safety piles.

Drawings

Fig. 1 is a drawing for making a support pillar. Wherein the upright 1 is supported.

Fig. 2 is a manufacturing diagram of the self-locking mechanism. Wherein, the self-locking mechanism 2.

Fig. 3 is a cross top shaft bracket manufacturing diagram. Wherein, the cross top shaft bracket 3.

Fig. 4 is a manufacturing view of the fixing pile. Wherein the piles 4 are fixed.

Fig. 5 is a drawing for producing an inner lead screw. Wherein the inner lead screw 5.

Fig. 6 is a drawing of an outer lead screw. Wherein, the outer lead screw 6.

Fig. 7 is a drawing of a top sliding door frame. Wherein the door frame 8 is pulled upwards.

FIG. 8 is a drawing showing the ladle turret casting station being disassembled and assembled. The steel ladle comprises a first heat insulation protection plate 9, a steel ladle cover 10, a steel ladle 11, a steel ladle rotating platform 12, a No. 1 fork arm 13, a casting bridge crane 14, a first upper crank 15, a No. 2 fork arm 16, a second upper crank 17 and a second heat insulation protection plate 18.

Fig. 9 is a ladle turret waiting position sealing diagram. The device comprises a support upright post 1, a fixing pile 4, a first ladle lifting hydraulic cylinder 19, a second ladle lifting hydraulic cylinder 20, a mandril 21, a 100t hydraulic jack 22, a turntable support 23, a lower connecting rod 24, a revolving body 25 and a temporary operating platform 28.

Fig. 10 is a mounting view of the spud. Wherein the fixed pile 4 and the inclined sizing block 26.

FIG. 11 is a cross-sectional view of a spherical plain bearing and a pin. The turntable support 23, the pin shaft 27, the first joint bearing 29, the second joint bearing 30, the first bearing end cover 31, the second bearing end cover 32, the first bearing bush 33, the second bearing bush 34 and the connecting bolt 35 are arranged on the turntable support

FIG. 12 is a view of the joint bearing bushing removed. The hydraulic lifting device comprises a cross top shaft frame 3, an inner lead screw 5, an outer lead screw 6, a 50t hydraulic jack 7, a first bearing bush 33 and a nut 36.

Fig. 13 is a view of the knuckle bearing removed. The cross top shaft frame 3, the inner side lead screw 5, the outer side lead screw 6, the 50t hydraulic jack 7, the first joint bearing 29 and the nut 36.

Fig. 14 is a pin removal view one. The cross top shaft frame 3, the inner lead screw 5, the outer lead screw 6, the 50t hydraulic jack 7, the pin shaft 27 and the nut 36.

Fig. 15 is a pin shaft removal view two. The device comprises a top-pull door type frame 8, a pin shaft 27, a first knuckle bearing 29, a second knuckle bearing 30 and a 200t hydraulic jack 37.

Detailed Description

Example 1

The ladle turret of a 1# slab caster in a steelmaking operation area, which is a steelmaking operation area of a first steel share qian steel company, is used in a normal working environment for nearly 11 years, and it is found that the inside knuckle bearing on the right side of an upper crank (also called an L arm) gives out abnormal sound when a 2# fork arm of a 1# ladle turret rises and falls under the condition of sitting on a heavy ladle, and the direct reason for the abnormal sound is analyzed to be that the inside knuckle bearing or a pin shaft on the right side of the upper crank of the 2# fork arm is worn, and the unsmooth sliding contact surface formed by the knuckle bearing or the pin shaft of the worn 2# fork arm when the heavy ladle rises and falls produces the abnormal sound when the 2# fork arm makes relative motion. To prevent further expansion of the situation and possible future serious consequences to the production, a steelmaking operation area requires replacement of the inboard knuckle bearing and pin on the 2# yoke right of the crank with downtime. The pin shaft connected with the inner joint bearing on the right side of the crank on the No. 2 yoke is simultaneously connected with the inner joint bearing on the left side of the crank on the No. 1 yoke, namely the inner joint bearing on the right side of the crank on the No. 2 yoke and the inner joint bearing on the left side of the crank on the No. 1 yoke share a pin shaft (also called a common pin shaft), so that the inner joint bearing on the right side of the crank on the No. 2 yoke and the inner joint bearing on the left side of the crank on the No. 1 yoke and the common pin shaft need to be replaced together when the inner joint bearing and the pin shaft on the crank on the.

The ladle turret of the steelmaking slab caster is mainly used for revolving a heavy ladle for casting from a feeding straddle position to a casting straddle position, and then revolving an empty ladle from the casting straddle position to the feeding straddle position after casting. The weight of the ladle turret is 276.5t, and the ladle turret is arranged right below a common track beam of a feeding and casting two-span bridge crane on a +12860mm platform, so that the hoisting operation of overhauling, dismounting and mounting of each part of the ladle turret is not within the operation range of the feeding and casting two-span bridge crane; the height of the top elevation of the ladle turret when the fork arm is lowered to the lowest point after the ladle turret is installed is +23076mm, the height of the bottom elevation of the two-span public bridge crane beam is +25030mm, the distance between the top surface of the equipment and the bottom surface of the bridge crane track beam is only 1954mm, and the hoisting operation difficulty during construction and installation is large.

1) Determination of construction method

The traditional construction method is that the joint bearing and the pin shaft on the inner side of the crank on the ladle turret are replaced by an integral sealing and top-down double-vehicle lifting and hoisting dismounting method: firstly, manufacturing a 12000mm long shoulder pole beam; secondly, dismantling the heat insulation guard plate; thirdly, sealing and fixing a fork arm, a lower connecting rod and an upper crank of the ladle turret so as to enable the fork arm, the lower connecting rod and the upper crank to be immovable; fourthly, manufacturing and installing a temporary operating platform at the position of replacing the joint bearing and the pin shaft; fifthly, using two bridge cranes with two spans of feeding and casting to lift and lift the handles on the No. 1 and No. 2 fork arms through the carrying pole beam, and replacing the joint bearing and the pin shaft; and sixthly, the crank and the heat insulation protective plate are installed back in the reverse order of the disassembly to complete the replacement. This approach has three difficulties: firstly, the method needs to occupy one bridge crane of two spans for long time during construction, which can seriously affect the production rhythm of the two spans and cause immeasurable loss to production; secondly, because the weight of each part of the ladle turret is large, a single upper crank weighs 45t, and the distance between the top surface of the equipment and the bottom surface of the track beam of the bridge crane is small, the difficulty of dismounting and hoisting operation is large, the construction period is long, and the safety risk is large; thirdly, the target joint bearing and the pin shaft can be replaced only after two upper cranks, eight sets of pin shafts and corresponding joint bearings are disassembled and installed, the engineering quantity is large, the construction difficulty is high, and the occupied space is large.

In order to save the construction time to the utmost extent under the prerequisite of guaranteeing safety and quality, reduce construction cost, decide to adopt and seal the inboard joint bearing of crank and round pin axle on the ladle turret to change by the fine setting method: firstly, manufacturing a tool before stopping the machine; secondly, detaching the heat insulation plate; thirdly, sealing a No. 1 and No. 2 fork arm and an upper crank of the ladle turret; fourthly, mounting a temporary operating platform at the position of replacing the joint bearing and the pin shaft; fifthly, manufacturing and installing a safety interlocking mechanism between the upper crank and the support; and sixthly, replacing the joint bearing and the pin shaft. The method fully utilizes the existing construction conditions, completes the construction task more efficiently and quickly, and solves various problems of the traditional construction method.

2) Manufacturing of tool

The used tool comprises a fork arm supporting upright post 1, a self-locking mechanism 2, a cross top shaft frame 3, a fixed pile 4 and an inner side lead screw 5, wherein an outer side lead screw 6 and a top sliding door type frame 7 need to be manufactured before shutdown maintenance; during manufacturing, lofting and material marking are carried out according to the size of a design drawing in a ratio of 1: 1; the cutting of the steel plate adopts a semi-automatic cutting machine, and the cutting of the section bar adopts gas cutting, so that the cut material is ensured not to be distorted and deformed; the assembly sequence of the tool is determined according to the structural form and the welding method of manual carbon dioxide arc welding, all parts of the tool are stuck together in a spot welding mode, full welding is carried out on all connecting parts, when hidden welding seams exist, welding is carried out firstly, and the next procedure can be carried out after the hidden welding seams are inspected to be qualified; the welding of the components is carried out strictly according to the welding operation instruction, and welding stress and welding deformation are reduced by reasonably arranging the welding sequence and adopting a rigid fixing method. The inner lead screw 5 and the outer lead screw 6 are processed strictly according to the design drawing, and Q275 high-quality carbon steel is used as the material;

3) the first heat insulation protection plate 9 and the second heat insulation plate 18 are removed

And (3) removing the ladle cover 10 after the machine is stopped, hoisting the ladle 11 away, rotating the No. 1 fork arm 13 of the ladle turret 12 to stop at a casting position, removing the first heat-insulation guard plate 9 on the No. 1 fork arm 13 and the first upper crank 15 by using a pouring bridge-type crane 14 in a matching manner, rotating the ladle turret 12 by 180 degrees, and removing the second heat-insulation guard plate 18 on the No. 2 fork arm 16 and the second upper crank 17 by using the same method.

4) 1# yoke 13, 2# yoke 16 and the fixing of the upper crank I15 and the upper crank II 17

The ladle turret 12 is rotated and stopped at a waiting position, and the No. 1 fork arm 13 and the No. 2 fork arm 16 are lifted to a horizontal position by using the first ladle lifting hydraulic cylinder 19 and the second ladle lifting hydraulic cylinder 20. Firstly, the first upper crank 15 and the second upper crank 17 of the ladle turret 12 are supported and fixed by the first upper crank 15 and the second upper crank 17 through the ejector rods 21 of the first upper crank 15 and the second upper crank 17, then the 1# fork arm 13 and the 2# fork arm 16 are supported and fixed by four supporting upright posts 1 and four 100t jacks 22, in order to ensure the construction safety, fixed piles are required to be supported between the first upper crank 15 and the second upper crank 17 and a turntable support 23 and between the lower connecting rod 24 and a turntable rotator 25, two inclined sizing blocks 26 are used for realizing the installation of the fixed piles, and the inclined sizing blocks 26 are tapped by a hand hammer until the inclined sizing blocks cannot shake manually. The four 100 jacks 22 are used for finely adjusting the upper and lower positions of the 1# fork arm 13 and the 2# fork arm 16 when the pin 27 is removed and installed, so that the upper crank I15 and the upper crank II 17 are driven to finely adjust pin shaft holes, and the pin 27 is more smoothly removed and installed.

5) The pin shaft 27 is disassembled and assembled to manufacture and install the temporary operating platform 28

The temporary operating platform 28 for dismounting and mounting the pin shaft 27 is 1800mm long and 1400mm wide, the manufacturing and mounting principles are that the temporary operating platform is connected with the ladle turret 12 through bolts as far as possible, important positions need to be avoided during welding, 10# I-shaped steel is used as a frame of the temporary operating platform 28, a pattern steel plate with the thickness of 3mm is used as a bottom surface, a welded steel pipe of DN20 is used as a railing, and the height of the railing is not less than 1200 mm.

6) Self-locking mechanism 2 mounting

In order to ensure that the position variation of the first upper crank 15 and the second upper crank 17 is less than 1mm after the pin shaft 27 is removed, the self-locking mechanisms 2 are welded and installed between the left and right sides of the cross rods of the first upper crank 15 and the second upper crank 17 and the turntable support 23, which need to replace the first knuckle bearing 29 and the second knuckle bearing 30 and the pin shaft 27, and four groups. When the self-locking mechanism 2 is designed, the first upper crank 15 and the second upper crank 17 are required to have 5mm regulating quantity in four directions, namely the upper direction, the lower direction, the left direction and the right direction after the self-locking mechanism 2 is installed.

7) The first bearing end cover 31, the second bearing end cover 32, the first bearing bush 33, the second bearing bush 34, the first joint bearing 29, the second joint bearing 30 and the pin shaft 27 are removed

And removing the connecting bolts 35 of the first bearing end cover 31 and the first bearing bush 33, installing the inner lead screw 5, the outer lead screw 6, the cross top shaft frames 3 and the 50t hydraulic jacks 7, and sequentially lifting and removing the first bearing bush 33, the first joint bearing 29 and the pin shaft 27 by using the 50t hydraulic jacks 7 between the two cross top shaft frames 3. If a large flaw is worn between the pin shaft 27 and the contact surfaces of the first knuckle bearing 29 and the second knuckle bearing 30, when the jacking force of the 50t hydraulic jack 7 cannot pull and remove the first knuckle bearing 29 and the pin shaft 27, the second bearing end cover 32 and the second bearing bush 34 are removed by the method, the prefabricated sliding door frame 8 is installed on the turntable support 23 on the side of the first bearing end cover 31, the center of the pin shaft 27 needs to be aligned when the sliding door frame 8 is installed, finally the 200t hydraulic jack 37 is erected, and the pin shaft 27 is ejected out through the sliding door frame 8 by the 200t hydraulic jack 37.

8) The first replacement joint bearing 29 and the second replacement joint bearing 30

After the pin shaft 27 is removed, the inner lead screw 5, the outer lead screw 6 and the cross top shaft frame 3 and 50t hydraulic jack 7 are used for removing the second oscillating bearing 30, because the first oscillating bearing 29 and the second oscillating bearing 30 of the steel ladle rotary table 12 are spherical bearings, the inner ring and the outer ring of the first oscillating bearing 29 and the second oscillating bearing 30 move freely, the inner ring of the first oscillating bearing 29 and the second oscillating bearing 30 can swing greatly due to small external force, and great difficulty is brought to the installation of the pin shaft 27, therefore, before the new first oscillating bearing 29 and the second oscillating bearing 30 are reinstalled, the inner rings of the first oscillating bearing 29 and the second oscillating bearing 30 are fixed by adopting a method of welding a stop block so as to prevent the first oscillating bearing 29 and the second oscillating bearing 30 from freely swinging when the pin shaft 27 is reinstalled, after the bearing positions of the first knuckle bearing 29 and the second knuckle bearing 30 are aligned, the first knuckle bearing 29 and the second knuckle bearing 30 are pressed into the bearing positions by the inner lead screw 5, the outer lead screw 6 and the cross top shaft frame 3 and 50t hydraulic jacks 7.

9) The pin shaft 27, the first bearing bush 33, the second bearing bush 34, the first bearing end cover 31 and the second bearing end cover 32 are installed again

The first bearing end cover 31, the second bearing end cover 32, the second bearing bush 34, the first bearing end cover 31 and the pin shaft 27 are installed back and removed in reverse order, when the pin shaft 27 is installed back, the two bearing holes of the first joint bearing 29 and the second joint bearing 30 are aligned with the four holes of the first bearing bush 33 and the two bush holes of the second bearing bush 34 on the turntable support 23, and then the pin shaft 27 is pressed into the holes in a mode opposite to the removal mode. Centering the pin 27 based on the two bushing holes of the first bearing bushing 33 and the second bearing bushing 34, and using the method opposite to the dismounting to align the first bearing bushing 33 and the second bearing bushing 34 with the first bearing end cover 31 and the second bearing end cover 32.