CN114000723A - Large-scale continuous casting ladle slewing table slewing bearing replacement bracket and replacement method - Google Patents
Large-scale continuous casting ladle slewing table slewing bearing replacement bracket and replacement method Download PDFInfo
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- CN114000723A CN114000723A CN202111263167.3A CN202111263167A CN114000723A CN 114000723 A CN114000723 A CN 114000723A CN 202111263167 A CN202111263167 A CN 202111263167A CN 114000723 A CN114000723 A CN 114000723A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000009749 continuous casting Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
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- 230000008569 process Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 4
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- 230000005611 electricity Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
- B22D41/13—Ladle turrets
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
- E04G23/065—Lifting of buildings
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Abstract
The invention discloses a replacement bracket and a replacement method for a slewing bearing of a large continuous casting ladle turret, which comprises a rectangular support bracket body and a jacking mechanism; the support frame body comprises four bottom plates, four support upright posts, a horizontal support, an inclined support and a base plate; the bottom plate is arranged above the concrete foundation, a support upright post is fixedly arranged above the bottom plate, horizontal supports are transversely arranged at the upper end and the lower end between the support upright posts below the two fork arms of the revolving arm, and an inclined support is arranged in the middle of the horizontal supports; the top of the supporting upright post is welded with a steel plate with the same section size, and a jacking mechanism and a plurality of backing plates are longitudinally arranged above the steel plate and used for backing up the slewing bearing structure. The invention mainly adopts a supporting system, the upper structure of the slewing bearing is jacked to a certain height in situ, then the slewing bearing is horizontally moved out, and the traveling crane is adopted for hoisting and moving, so that the utilization rate of the traveling crane is effectively improved. The 4 jacks are adopted for synchronous vertical jacking, position alignment is not needed during reinstalling and positioning, the installation difficulty is reduced, and the safety risk during structure displacement is reduced.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a replacement bracket and a replacement method for a slewing bearing of a large continuous casting ladle turret.
Background
Ladle turrets, also known as ladle turrets in some steelworks, are commonly positioned between the molten steel receiving bay and the array of pouring bays for carrying ladles across the bay and supporting the ladles for casting equipment. The ladle A is rotated 180 degrees after the molten steel is poured, so that the ladle B filled with the molten steel at the other end is continuously poured, and the ladle A is hoisted and rotated away to be changed into the next ladle C filled with the molten steel to occupy the position of the ladle A. The continuous pouring of the molten steel is realized by reciprocating in the way. The ladle turret acts as a slewing support.
The ladle turret is one of the key devices of a continuous casting machine and plays an important role in connecting an upper process and a lower process. The slewing bearing is a key component of the ladle turret and mainly comprises a bearing inner ring, an outer ring, balls and the like, wherein the bearing outer ring is connected with the slewing part through high-strength bolts, the bearing inner ring is connected with a lower cylinder body of the fixed part through high strength, and the slewing bearing is a connecting piece of the static part and the rotating part of the turret and can bear and transmit vertical load, horizontal load and tilting moment from the rotating part above the slewing base.
Slewing bearing is bulky, and weight is heavier, receives equipment and factory building space influence simultaneously, and the replacement method that mainly adopts at present has two kinds:
1. a disassembly and lifting method: and (3) dismantling the crossed arm at the upper part of the rotary table, manufacturing a special lifting appliance, adjusting away the upper structure of the slewing bearing by adopting a receiving span and pouring span traveling crane, and then replacing the slewing bearing by adopting a 10t electric hoist.
2, integral hoisting method: and hoisting the cross arm by adopting a pouring span and a receiving span crane, integrally hoisting and moving the upper structure of the slewing bearing to the upper surface of a tool manufactured in advance, and then replacing the slewing bearing by adopting a 10t electric hoist.
The construction processes of the two replacement operations all need to consume a large amount of manpower and material resources, the two straddle type traveling cranes are different in specification and model, the lifting equipment is lifted and moved, the construction difficulty is high, the safety risk is high, the lifting time of the two straddle type traveling cranes is long, the production of other continuous casting machines is severely restricted, and the production requirements of fast pace and high strength are more and more difficult to meet.
Disclosure of Invention
Due to the defects in the prior art, the invention provides a replacement bracket and a replacement method for a slewing bearing of a large-scale continuous casting ladle turret, and aims to solve the problems of difficulty, high risk and manpower and material resource consumption in the replacement construction of the conventional slewing bearing.
In order to achieve the purpose, the invention provides the following technical scheme:
the large-scale continuous casting ladle turret slewing bearing replacing support comprises a rectangular support frame body and a jacking mechanism; the support frame body comprises four bottom plates, four support upright posts, a horizontal support, an inclined support and a base plate; the bottom plate is arranged above the concrete foundation, a support upright post is fixedly arranged above the bottom plate, horizontal supports are transversely arranged at the upper end and the lower end between the support upright posts below the two fork arms of the revolving arm, and an inclined support is arranged in the middle of the horizontal supports; the top of the supporting upright post is welded with a steel plate with the same section size, and a jacking mechanism and a plurality of backing plates are longitudinally arranged above the steel plate and used for backing up the slewing bearing structure.
The support post includes two not H shaped steel of co-altitude, and the pterygoid lamina of two H shaped steel pastes the tight welding together, and the lower extreme parallel and level welds on the bottom plate, and highly short shaped steel is located the inboard of supporting the support body, and the steel sheet with cross-sectional dimension all welds in the upper end of two H shaped steel.
And a reinforcing rib plate is welded between the steel plates at the upper ends of the two H-shaped steels and the H-shaped steel.
The quick jacking and replacing method for the slewing bearing of the large continuous casting ladle turret comprises the following steps:
and 8, mounting the slewing bearing, and removing and replacing the support and the supporting platform.
The specific operation method of the step 2 is as follows:
2.1, respectively placing 4 bottom plates on a concrete foundation vertically below 4 arms of the rotary arm, wherein the center distance of steel plates on the same side is consistent with the center distance of fork arms of the rotary arm;
2.2, manufacturing 4 groups of supporting upright columns by adopting H-shaped steel, wherein two H-shaped steel are arranged in a group with one high and one low, and the height difference is determined according to the height of a hydraulic jack adopted on site;
2.3, two H-shaped steel wing plates are tightly welded into a whole, steel plates with the same section size as the section steel are welded at the tops of the two H-shaped steel wing plates and used for placing a hydraulic jack and a base plate, reinforcing rib plates are welded between the steel plates and the H-shaped steel, and the bottoms of the 4 groups of supporting upright columns are welded on corresponding steel plate bases;
and 2.4, connecting a horizontal support and an inclined support between the support upright posts below the two fork arms of the rotary arm.
And 2.4, the horizontal support in the step 2.4 adopts 12# channel steel, the upper part and the lower part between the two groups of support columns are respectively connected with one horizontal support, and the middle part is connected with an inclined support in a cross bracing mode.
The specific operation of step 6 is as follows:
firstly, synchronously and slowly jacking 4 hydraulic jacks, placing a base plate on the top of a support upright column every jacking distance until the upper structure of the slewing bearing is jacked to a target position, compacting the base plate and keeping the hydraulic jacks in a pressure maintaining state;
then marking the S point of the inner and outer rings of the slewing bearing at the corresponding position of the lower cylinder body, and sliding the slewing bearing from the lower cylinder body to a supporting platform;
and finally, hoisting the old slewing bearing away by adopting a travelling crane, hoisting the new slewing bearing to the supporting platform, sliding the new slewing bearing to the mounting position of the lower barrel, and adjusting the new slewing bearing in place according to the corresponding mark.
The specific operation of step 7 is as follows:
7.1, synchronously jacking 4 hydraulic jacks, and removing the uppermost backing plate;
7.2, slowly releasing pressure, so that the stroke is reduced for a certain distance, and then removing a base plate;
7.3, repeating the step 7.2 until all the base plates are removed;
and 7.4, stably mounting the upper structure on the slewing bearing.
The hydraulic jack stops after descending for a certain distance each time, and a certain safety clearance is always ensured to exist between the bottom of the rotary arm and the base plate.
The safety clearance is not less than 5 mm.
Compared with the prior art, the invention has the following advantages or beneficial effects:
1. the invention mainly adopts a supporting system to lift the upper structure of the slewing bearing to a certain height in situ, then horizontally move out of the slewing bearing, and adopt traveling crane hoisting movement, thereby occupying very short traveling crane time and effectively improving the utilization rate of traveling cranes.
2. The 4 jacks are adopted for synchronous vertical jacking, and when the slewing bearing upper structure is reassembled and positioned, the position alignment is not needed, so that the mounting difficulty is reduced, and the safety risk during structure displacement is reduced.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a side view in the casting direction showing the tool change installation of the present invention.
FIG. 2 is a front elevation view of the casting strand with the replacement tool installed in accordance with the present invention.
Wherein, 1-concrete foundation; 2-a bottom plate; 3-supporting the upright column; 4-a backing plate; 5-a hydraulic jack; 6-reinforcing plate; 7-upper horizontal support; 8-lower horizontal support; 9-inclined strut; 10-a sliding support platform; 11-a swivel arm; 12-a rotary lifting hydraulic cylinder; 13-a slewing bearing; 14-a slewing bearing connection; 15-cardan shaft; 16-a locking device; 17-electro-hydraulic slip ring.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and specific examples, but the present invention is not limited thereto.
In the prior art, a travelling crane is mainly adopted to lift and shift the upper structure of a slewing bearing, and then an electric hoist is adopted to replace the slewing bearing, so that the method mainly utilizes a pouring straddle crane and a receiving straddle crane to be matched for use, the travelling crane time is long, and the travelling crane possibly influences the operation of other construction projects or the production of other continuous casting machines; meanwhile, as the models of the two-span traveling vehicles are different, the lifting speed and the displacement speed of the steel wire rope are different, a high-level crane worker and a traveling worker are required to be matched during lifting and displacement, and a certain degree of safety risk exists; when the superstructure is turned around, the positioning difficulty is high.
According to the weight of the ladle turret and the height of the fork-shaped arm from the base in the horizontal state, a jacking component is manufactured in advance, after the ladle turret is shut down, a connecting bolt of the slewing bearing and the upper structure is removed, the jacking component is connected to the base of the turret, the fork-shaped arm is jacked up by a hydraulic jack to jack the upper structure of the turret, then the connecting bolt of the slewing bearing and the lower barrel body and other accessories are removed, and the slewing bearing is moved out of the ladle turret in a sliding mode to be replaced.
The invention mainly adopts a supporting system, the upper structure of the slewing bearing is jacked to a certain height in situ, then the slewing bearing is horizontally moved out, and the traveling crane is adopted for hoisting and moving, so that the occupied traveling crane time is very short, and the traveling crane utilization rate is effectively improved; the 4 jacks are adopted for synchronous vertical jacking, and when the slewing bearing upper structure is reassembled and positioned, the position alignment is not needed, so that the mounting difficulty is reduced, and the safety risk during structure displacement is reduced.
The large-scale continuous casting ladle turret slewing bearing replacing support comprises a rectangular support frame body and a jacking mechanism; the support frame body comprises four bottom plates, four support upright posts, a horizontal support, an inclined support and a base plate; the bottom plate is arranged above the concrete foundation, a support upright post is fixedly arranged above the bottom plate, horizontal supports are transversely arranged at the upper end and the lower end between the support upright posts below the two fork arms of the revolving arm, and an inclined support is arranged in the middle of the horizontal supports; the top of the supporting upright post is welded with a steel plate with the same section size, and a jacking mechanism and a plurality of backing plates are longitudinally arranged above the steel plate and used for backing up the slewing bearing structure.
The support post includes two not H shaped steel of co-altitude, and the pterygoid lamina of two H shaped steel pastes the tight welding together, and the lower extreme parallel and level welds on the bottom plate, and highly short shaped steel is located the inboard of supporting the support body, and the steel sheet with cross-sectional dimension all welds in the upper end of two H shaped steel.
And a reinforcing rib plate is welded between the steel plates at the upper ends of the two H-shaped steels and the H-shaped steel.
The quick jacking and replacing method for the slewing bearing of the large continuous casting ladle turret comprises the following steps:
and 8, mounting the slewing bearing, and removing and replacing the support and the supporting platform.
Specific embodiment, as shown in figures 1 and 2,
the large-scale continuous casting ladle turret slewing bearing replacing support comprises a rectangular support frame body and a jacking mechanism; the support frame body comprises four bottom plates 2, four support upright posts 3, a horizontal support, an inclined support and a base plate 4; the concrete foundation comprises a concrete foundation 1, a bottom plate, a rotary arm 11, a support upright post, an inclined strut 9 and a supporting upright post, wherein the bottom plate is arranged above the concrete foundation 1, the support upright post is fixedly arranged above the bottom plate, horizontal struts are transversely arranged at the upper end and the lower end of the support upright post 3 below two fork arms of the rotary arm 11 respectively, each horizontal strut comprises an upper horizontal strut 7 and a lower horizontal strut 8, and the inclined strut 9 is arranged in the middle of the horizontal strut; the top of the supporting upright post 3 is welded with a steel plate with the same section size, and a jacking mechanism and a plurality of backing plates 4 are longitudinally arranged above the steel plate and used for backing up a slewing bearing 13 structure. The jacking mechanism of this embodiment is a hydraulic jack 5.
The support post 3 includes two not H shaped steel of co-altitude, is first H shaped steel and second H shaped steel respectively, and wherein first H shaped steel is a relatively high one, and second H shaped steel is a relatively short one, and the pterygoid lamina of two H shaped steel pastes tight welding together, and the lower extreme parallel and level welds on bottom plate 2, and first H shaped steel is located the outside of supporting the support body, and second H shaped steel is located the inboard of supporting the support body, and the steel sheet with cross sectional dimension all welds in the upper end of two H shaped steel.
And a reinforcing rib plate 6 is welded between the steel plates at the upper ends of the two H-shaped steels and the H-shaped steel.
The specific method for replacing the slewing bearing by adopting the slewing bearing replacing bracket of the large continuous casting ladle slewing table comprises the following steps:
2.1, respectively placing 4 bottom plates on a concrete foundation 1 vertically below 4 arms of a rotary arm 11, wherein the center distance of steel plates on the same side is consistent with the center distance of fork arms of the rotary arm; 4 steel sheet bases are processed in the field, and the specific size is as follows: 1000mm 40mm, is used for giving the supporting system as the bottom plate, increase the supporting system and contact surface of the concrete foundation, improve the holding power;
2.2, manufacturing 4 groups of supporting upright columns by adopting H-shaped steel, wherein two H-shaped steel are arranged in a group with one high and one low, and the height difference is determined according to the height of a hydraulic jack adopted on site;
2.3, two H-shaped steel wing plates are tightly welded into a whole, steel plates with the same section size as the section steel are welded at the tops of the two H-shaped steel wing plates and used for placing a hydraulic jack and a base plate, reinforcing rib plates are welded between the steel plates and the H-shaped steel, and the bottoms of the 4 groups of supporting upright columns are welded on corresponding steel plate bases; in the embodiment, a steel plate with the thickness of 40mm and the same section size as the section steel is welded at the top of the H-shaped steel and is used for placing a hydraulic jack and a base plate;
and 2.4, in order to ensure that the support system is stable, connecting a horizontal support and an inclined support between the support columns below the two fork arms of the rotary arm, wherein the horizontal support adopts a 12# channel steel, the upper part and the lower part between the two groups of support columns are respectively connected with one horizontal support, and the middle part of the horizontal support is connected with the inclined support in a cross-bracing manner.
The specification of the H-shaped steel is 400 × 13 × 21.
The profile steel support is convenient to disassemble and assemble, and the height of the top of the profile steel support, which is 100-200 mm away from the bottom surface of the revolving arm, is reserved;
firstly, synchronously and slowly jacking 4 hydraulic jacks, placing a cushion plate with the thickness of 30mm on the top of a support upright column every time the hydraulic jacks are jacked with the distance of 30mm, circulating the process until the upper structure of the slewing bearing is jacked to 300mm, tamping the cushion plate and keeping the hydraulic jacks in a pressure maintaining state;
then marking the S point of the inner and outer rings of the slewing bearing at the corresponding position of the lower cylinder body, and sliding the slewing bearing from the lower cylinder body to a supporting platform;
and finally, hoisting the old slewing bearing away by adopting a travelling crane, hoisting the new slewing bearing to the supporting platform, sliding the new slewing bearing to the mounting position of the lower barrel, and adjusting the new slewing bearing in place according to the corresponding mark.
7.1, synchronously jacking 4 hydraulic jacks for 5mm, and removing the uppermost cushion plate;
7.2, slowly relieving pressure to enable the stroke to be reduced by 30mm, and then removing a base plate;
7.3, repeating the step 7.2 until all the base plates are removed;
and 7.4, stably mounting the upper structure on the slewing bearing.
The hydraulic jack stops after descending for a certain distance each time, and the bottom of the rotary arm is always ensured to have a safety clearance which is not less than 5mm away from the base plate.
And 8, installing a connecting bolt of the slewing bearing and the ladle turret, installing an electro-hydraulic slip ring and an upper structure connecting universal shaft, recovering hydraulic pressure, electricity, lubricating grease and other auxiliary facilities.
The best method for implementing the invention is to determine the type selection of the hydraulic jack according to the weight of the upper structure of the rotary support of the ladle turret before construction, and then measure the distance between the horizontal reloading arm and the concrete foundation. Preparing and blanking section steel materials in advance according to drawings and site practice, and assembling and welding part of section steel in advance; preparing the materials to the site before construction; after the machine is stopped, the rotary table is rotated to the vertical direction of the casting flow, and then the construction can be carried out. This is a well-established method for practicing the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. Support is changed to large-scale continuous casting ladle turret slewing bearing, its characterized in that: comprises a rectangular support frame body and a jacking mechanism; the support frame body comprises four bottom plates, four support upright posts, a horizontal support, an inclined support and a base plate; the bottom plate is arranged above the concrete foundation, a support upright post is fixedly arranged above the bottom plate, horizontal supports are transversely arranged at the upper end and the lower end between the support upright posts below the two fork arms of the revolving arm, and an inclined support is arranged in the middle of the horizontal supports; the top of the supporting upright post is welded with a steel plate with the same section size, and a jacking mechanism and a plurality of backing plates are longitudinally arranged above the steel plate and used for backing up the slewing bearing structure.
2. The large scale continuous casting ladle turret slewing bearing replacing support according to claim 1, characterized in that: the support post includes two not H shaped steel of co-altitude, and the pterygoid lamina of two H shaped steel pastes the tight welding together, and the lower extreme parallel and level welds on the bottom plate, and highly short shaped steel is located the inboard of supporting the support body, and the steel sheet with cross-sectional dimension all welds in the upper end of two H shaped steel.
3. The large scale continuous casting ladle turret slewing bearing replacing support according to claim 2, characterized in that: and a reinforcing rib plate is welded between the steel plates at the upper ends of the two H-shaped steels and the H-shaped steel.
4. A quick jacking replacement method for a large-scale continuous casting ladle turret slewing bearing is characterized by comprising the following steps: the method comprises the following steps:
step 1, rotating a ladle revolving arm to a position where a casting flow is vertical, adjusting a revolving arm lifting hydraulic cylinder to enable the bottom of the revolving arm to be in a horizontal state, and welding and connecting the revolving arm and a main cylinder by adopting a steel plate to ensure that the revolving arm is in the horizontal state;
step 2, arranging the replacement bracket of the slewing bearing of the large-scale continuous casting ladle slewing table in the claim 1, 2 or 3 on the concrete foundation below the slewing arm, and reserving a certain height from the bottom surface of the slewing arm at the top of the bracket;
step 3, arranging 4 hydraulic jacks and a base plate at the top end of the support upright column, and tamping the space between the top of the support upright column and the rotary arm by using the base plate;
step 4, removing the bolts, the locking devices and the auxiliary facilities of the connection of the electro-hydraulic slip ring and the upper structure, wherein the bolts, the locking devices and the electro-hydraulic slip ring are connected with the rotary table of the ladle;
step 5, building a slewing bearing sliding support platform on the outer side of the slewing table in the casting direction;
step 6, controlling a hydraulic jack to jack the upper structure of the slewing bearing to a target position, dismantling the slewing bearing, sliding the slewing bearing to a support platform to move out, transferring a new slewing bearing to the mounting position of the lower barrel through the support platform, and adjusting;
step 7, controlling the hydraulic jack to stably descend the upper structure of the slewing bearing to the position of the slewing bearing;
and 8, mounting the slewing bearing, and removing and replacing the support and the supporting platform.
5. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 4, wherein the method comprises the following steps: the specific operation method of the step 2 is as follows:
2.1, respectively placing 4 bottom plates on a concrete foundation vertically below 4 arms of the rotary arm, wherein the center distance of steel plates on the same side is consistent with the center distance of fork arms of the rotary arm;
2.2, manufacturing 4 groups of supporting upright columns by adopting H-shaped steel, wherein two H-shaped steel are arranged in a group with one high and one low, and the height difference is determined according to the height of a hydraulic jack adopted on site;
2.3, two H-shaped steel wing plates are tightly welded into a whole, steel plates with the same section size as the section steel are welded at the tops of the two H-shaped steel wing plates and used for placing a hydraulic jack and a base plate, reinforcing rib plates are welded between the steel plates and the H-shaped steel, and the bottoms of the 4 groups of supporting upright columns are welded on corresponding steel plate bases;
and 2.4, connecting a horizontal support and an inclined support between the support upright posts below the two fork arms of the rotary arm.
6. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 5, wherein the method comprises the following steps: and 2.4, the horizontal support in the step 2.4 adopts 12# channel steel, the upper part and the lower part between the two groups of support columns are respectively connected with one horizontal support, and the middle part is connected with an inclined support in a cross bracing mode.
7. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 4, wherein the method comprises the following steps: the specific operation of step 6 is as follows:
firstly, synchronously and slowly jacking 4 hydraulic jacks, placing a base plate on the top of a support upright column every jacking distance until the upper structure of the slewing bearing is jacked to a target position, compacting the base plate and keeping the hydraulic jacks in a pressure maintaining state;
then marking the S point of the inner and outer rings of the slewing bearing at the corresponding position of the lower cylinder body, and sliding the slewing bearing from the lower cylinder body to a supporting platform;
and finally, hoisting the old slewing bearing away by adopting a travelling crane, hoisting the new slewing bearing to the supporting platform, sliding the new slewing bearing to the mounting position of the lower barrel, and adjusting the new slewing bearing in place according to the corresponding mark.
8. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 4, wherein the method comprises the following steps: the specific operation of step 7 is as follows:
7.1, synchronously jacking 4 hydraulic jacks, and removing the uppermost backing plate;
7.2, slowly releasing pressure, so that the stroke is reduced for a certain distance, and then removing a base plate;
7.3, repeating the step 7.2 until all the base plates are removed;
and 7.4, stably mounting the upper structure on the slewing bearing.
9. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 8, wherein the method comprises the following steps: the hydraulic jack stops after descending for a certain distance each time, and a certain safety clearance is always ensured to exist between the bottom of the rotary arm and the base plate.
10. The method for quickly jacking and replacing the slewing bearing of the large-scale continuous casting ladle turret according to claim 9, wherein the method comprises the following steps: the safety clearance is not less than 5 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116765371A (en) * | 2023-08-10 | 2023-09-19 | 重庆钢铁股份有限公司 | A method for replacing the slewing bearing of the ladle slewing table |
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| CN116765371A (en) * | 2023-08-10 | 2023-09-19 | 重庆钢铁股份有限公司 | A method for replacing the slewing bearing of the ladle slewing table |
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