A method for installing a mill off-line assembled monolithic slip vertical descent

Abstract

The present application relates to a kind of mill offline assembly integral sliding vertical installation method, including mill offline assembly step, mill integral sliding step and mill vertical installation step;The mill integral sliding step and mill vertical installation step are all used gantry hoisting system;The gantry hoisting system is set on horizontal sliding system, and is composed of combined lifting tower and climbing hydraulic jacking device.The present application uses horizontal sliding system and gantry hoisting system to realize the integral sliding and lifting of mill, and the gantry hoisting system uses modular design, and the structure is simple and compact, small, assembly flexible, site adaptability is good;The method described in the present application is particularly suitable for the replacement, reconstruction, installation engineering of large mill stand, especially suitable for mill reconstruction in short time, the condition that needs integral update mill, it can also be used for the piece type installation of super large mill stand.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rolling mill installation, in particular to a kind of installation method of rolling mill offline assembly integral slip vertical descent. BACKGROUND

[0002] At present, the single hoisting weight of large rolling mill housing has exceeded 500 tons, and the height has exceeded 16 meters, which is super high and super heavy for the crane in the workshop where the rolling mill is located, so other lifting equipment must be used to hoist and slide into position before installation. The lifting equipment is usually combined with gantry and hydraulic lifting device.

[0003] A Chinese invention patent with authorized announcement number CN 106517009 B discloses a "hoisting tool for large housing and its construction method", which includes frame support, bearing beam and lifting module. The top of the frame support is provided with a horizontal bearing beam. The lifting module includes lifting oil cylinder, lifting appliance and steel cable. The lifting oil cylinder is connected with the lifting appliance by steel cable. The lifting appliance includes upper lifting frame, connecting plate, rotating frame and upper rotating shaft. The lifting hydraulic oil cylinder of the lifting module is vertically fixed on the bearing beam. The rotating frame is provided with rotating support between the connecting beam. The technology combines steel cable hydraulic synchronous lifting device and rotating balance, integrating pushing, lifting and rotating.

[0004] Chinese patent application publication number CN115924707A discloses a "large-scale rolling mill frame hoisting method," comprising: 1) installing a ground-level sliding device and a hydraulic lifting and sliding device; 2) hoisting the transmission-side frame onto the ground-level sliding device, installing a hoisting fixture and a center-of-gravity adjustment device; 3) hoisting the transmission-side frame above the installation location using the hydraulic lifting and sliding device as the primary lifting mechanism, with the workshop crane assisting with the tail lift; 4) completing the installation of the transmission-side frame; 5) installing the operating-side frame onto the rolling mill base in the same manner as steps 2) to 4); and 6) installing the rolling mill crossbeam. This method is suitable for working conditions where the workshop crane cannot meet the lifting capacity and lifting height requirements. It utilizes a "ground-level sliding + vertical lifting followed by aerial sliding + aerial flipping" method to achieve horizontal transportation and vertical hoisting of the rolling mill frame. The hydraulic lifting and sliding device it adopts is composed of an operating side column, a transmission side column, a main sliding track beam, a main sliding beam, a main sliding hydraulic jacking device, a transverse support beam, a longitudinal support beam and a hydraulic lifting device; the two main sliding track beams are arranged in parallel, and the two ends of each main sliding track beam are supported by a transmission side column and an operating side column respectively. The transmission side column is correspondingly arranged on the transmission side of the rolling mill, and the operating side column is correspondingly arranged on the operating side of the rolling mill; the top of the main sliding track beam is respectively provided with a main sliding beam, and the main sliding beam can move along the main sliding track beam under the drive of the main sliding hydraulic jacking device; the two transverse support beams and the two longitudinal support beams are staggered in a crisscross shape on the top of the main sliding beam, and a group of hydraulic lifting devices are respectively provided in the middle of the two longitudinal support beams, and a rigging is provided at the bottom end of the steel hinge wire in the hydraulic lifting device.

[0005] While lifting equipment combining a gantry and hydraulic lift can meet the needs of hoisting large rolling mill arches, it suffers from large dimensions and difficult transportation. Most equipment is fabricated and installed on-site, making it difficult to reuse the equipment after mill installation. This results in low equipment turnover and high construction costs. Furthermore, the lifting equipment's relatively fixed dimensions make it difficult to adapt to different mill models. Summary of the Invention

[0006] The present invention provides an installation method for the offline assembly of a rolling mill with overall sliding and vertical descent, wherein a horizontal sliding system is coordinated with a gantry lifting system to realize the overall sliding and lifting of the rolling mill. The gantry lifting system adopts a modular design with a simple and compact structure, small space occupation, flexible assembly, and good site adaptability. The method of the present invention is particularly suitable for the replacement, modification, and installation projects of large rolling mill frames, and is particularly suitable for the modification of rolling mills in a short period of time and the situation where the rolling mills need to be updated as a whole. It can also be used for the segmented installation of extra-large rolling mill frames.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The application discloses a mill off-line assembly integral sliding vertical descending installation method, which comprises a mill off-line assembly step, a mill integral sliding step and a mill vertical descending installation step; the mill integral sliding step and the mill vertical descending installation step adopt a portal crane system; the portal crane system is arranged on a horizontal sliding system and is composed of a combined lifting tower and a climbing hydraulic jacking device; the combined lifting tower is provided with four stand columns; each stand column is provided with a group of climbing hydraulic jacking devices; the climbing hydraulic jacking device is composed of a lower telescopic locking mechanism, a hydraulic cylinder and an upper telescopic locking mechanism which are sequentially connected; the lower telescopic locking mechanism and the upper telescopic locking mechanism are respectively provided with transversely telescopic clamping claws; two longitudinal lifting beams are arranged in parallel, and the two ends of the longitudinal lifting beams are respectively connected with the upper telescopic locking mechanisms of the corresponding climbing hydraulic jacking devices; a transverse lifting beam is horizontally arranged between the two longitudinal lifting beams.

[0009] After the mill is assembled at the off-line assembly position, the mill is transported to a hoisting position by the horizontal sliding system; before hoisting, the climbing hydraulic jacking device is located at a starting hoisting height; after the mill enters the inside of the combined lifting tower, the transverse lifting beam is connected with the longitudinal lifting beams after penetrating below the mill beam; when the mill is hoisted, the climbing hydraulic jacking device is first supported at the bottom by the lower telescopic locking mechanism, then the cylinder rod of the hydraulic cylinder is extended upwards to move the upper telescopic locking mechanism upwards, and then the upper telescopic locking mechanism is supported at the top by the clamping claws extended to the corresponding height; after the clamping claws of the lower telescopic locking mechanism are retracted, the cylinder rod of the hydraulic cylinder is retracted to drive the lower telescopic locking mechanism to move upwards, and then the clamping claws of the lower telescopic locking mechanism are extended to the corresponding height to support the mill at the bottom again; the above steps are repeated to realize the climbing of the climbing hydraulic jacking device, and the mill is lifted stably by the synchronous control of the hydraulic cylinder; after the mill is hoisted, the mill is moved to a mill installation position along the sliding track by the portal crane system; then the climbing hydraulic jacking device is lowered vertically by adopting a process opposite to the climbing process, and the mill is installed in the mill foundation pit.

[0010] Further, the off-line assembly position of the mill is arranged at a mill main drive span, the assembled mill is first slid along a longitudinal horizontal sliding track parallel to a rolling center line to a mill installation position, and then is slid along a transverse horizontal sliding track parallel to a mill row center line to an integral lifting sliding track; the center line of the integral lifting sliding track and the rolling center line are located in the same vertical plane; the longitudinal horizontal sliding track, the transverse horizontal sliding track and the integral lifting sliding track are respectively provided with horizontal sliding systems; the portal crane system is arranged on the horizontal sliding system of the integral lifting sliding track.

[0011] Further, the horizontal sliding system is composed of sliding rail beams, sliding rails, sliding beams, sliding hydraulic thrust devices and connecting rods; the sliding rail beams are arranged side by side, the sliding rails are arranged on the two sliding rail beams respectively, the two sliding beams are arranged on the two sliding rails in parallel, the two sliding beams are connected by the connecting rods, one of the sliding beams is connected with the sliding hydraulic thrust device; when the rolling mill is carried by the horizontal sliding system to slide, the bottom sides are respectively provided with cushion beams to be leveled; the combined lifting tower is installed on the four sliding beams.

[0012] Further, the lower telescopic locking mechanism and the upper telescopic locking mechanism have the same structure, and are both composed of a bottom plate, a center support, a top plate, a telescopic hydraulic cylinder and a claw; the center support is connected between the bottom plate and the top plate, the telescopic hydraulic cylinders are arranged on the two sides of the center support, the telescopic hydraulic cylinders are arranged in the gap between the bottom plate and the top plate, and the extension end of the telescopic hydraulic cylinder is connected with the claw.

[0013] Further, the four columns of the combined lifting tower are connected by circumferentially arranged support structures; the support structure comprises a top connecting beam, an upper support, a lower support and an inclined support, and the inclined support is arranged between the upper support and the lower support; the upper support, the lower support and the inclined support are all telescopic structures.

[0014] Further, the columns of the combined lifting tower are all composed of multiple column modules assembled in the vertical direction; a vertical through groove is formed on one side of the column module, a tooth-shaped limiting claw groove is arranged at the bottom of the vertical through groove, and the vertical through grooves on the column modules in the same column form a climbing channel.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1) The main transmission span is used to complete the rolling mill offline assembly, the rolling mill offline assembly is synchronized with the rolling mill foundation construction, and the rolling line downtime reconstruction time is greatly shortened;

[0017] 2) The gantry crane system adopts a modular design, has a simple structure, flexible assembly, the climbing hydraulic jacking device is arranged in the column of the combined lifting tower, has better guiding performance, is not easy to be disturbed by the outside, has better operation reliability, improves the stress structure of the tower, greatly reduces the lifting and hoisting risk, has good site adaptability, compact structure and small space occupation;

[0018] 3) The present application is suitable for the replacement, reconstruction and installation of large rolling mill racks, especially suitable for the short-term rolling mill reconstruction, the integral update of the rolling mill, and can also be used for the installation of extra-large rolling mill in a piece. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the moving path diagram of the rolling mill offline assembly integral sliding of the present application.

[0020] Figure 2 is the schematic diagram of the horizontal sliding system and temporary assembly platform of the present application.

[0021] Figure 2a is the side view of Figure 2

[0022] Figure 3 is the schematic diagram of the off-line assembly of the rolling mill of the present application.

[0023] Figure 3a is the side view of Figure 3

[0024] Figure 4 is the schematic diagram of the combined lifting tower of the present application.

[0025] Figure 4a is the side view of Figure 4

[0026] Figure 4b is the schematic diagram of the climbing hydraulic lifting device of the present application.

[0027] Figure 4c is the schematic diagram of the vertical column of the combined lifting tower of the present application.

[0028] Figure 5 is the schematic diagram of the whole lifting of the rolling mill of the present application.

[0029] Figure 6 is the schematic diagram of the horizontal sliding of the rolling mill after the whole lifting of the present application.

[0030] Figure 7 is the schematic diagram of the vertical descending installation of the rolling mill of the present application.

[0031] Figure 8 is the schematic diagram of the installation of the rolling mill to the position of the present application.

[0032] Figure 8a is the side view of Figure 8

[0033] In the figure: A1. Off-line assembly position A2. Longitudinal horizontal sliding track A3. Transverse horizontal sliding track A4. Rolling mill row center line A5. Whole lifting sliding track A6. Rolling center line

[0034] ​​​​1. horizontal sliding system 101. sliding rail beam 102. sliding rail 103. sliding beam 104. sliding hydraulic pushing device 105. cushion beam 106. connecting rod 2. rolling mill 201. rolling mill beam 3. combined lifting tower 301. stand 301-1. stand module 301-2. vertical through slot 301-3. tooth-shaped limiting clamping groove 302. longitudinal lifting beam 303. transverse lifting beam 304. support structure 4. climbing hydraulic jacking device 401. hydraulic cylinder 402. lower telescopic locking mechanism 403. upper telescopic locking mechanism 404. clamping jaw DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described below in combination with the drawings:

[0036] The rolling mill off-line assembly integral sliding vertical descending installation method provided by the present application comprises a rolling mill off-line assembly step, a rolling mill integral sliding step and a rolling mill vertical descending installation step; the rolling mill integral sliding step and the rolling mill vertical descending installation step both adopt a gantry hoisting system; as shown in Figure 4 , Figure 4a The gantry hoisting system is arranged on the horizontal sliding system 1 and is composed of a combined lifting tower 3 and a climbing hydraulic jacking device 4; the combined lifting tower 3 is provided with four stands 301; each stand 301 is provided with a set of climbing hydraulic jacking devices 4; as shown in Figure 4b The climbing hydraulic jacking device 4 is composed of a lower telescopic locking mechanism 402, a hydraulic cylinder 401 and an upper telescopic locking mechanism 403 connected in sequence; the lower telescopic locking mechanism 402 and the upper telescopic locking mechanism 403 are respectively provided with clamping jaws 404 that can be transversely telescoped; two longitudinal lifting beams 302 are arranged in parallel, and the two ends of the longitudinal lifting beams 302 are respectively connected with the upper telescopic locking mechanisms 403 in the corresponding climbing hydraulic jacking devices 4; a transverse lifting beam 303 is transversely arranged between the two longitudinal lifting beams 302;

[0037] After the rolling mill 2 is assembled at the off-line assembly position A1, it is transported to the hoisting position (as shown in Figure 3 , Figure 3a Before hoisting starts, the climbing hydraulic jacking device 4 is at the starting hoisting height; after the rolling mill 2 enters the inside of the combined lifting tower 3, the transverse lifting beam 303 is connected with the longitudinal lifting beams 302 after passing below the rolling mill beam 201; when the rolling mill 2 is hoisted, the climbing hydraulic jacking device 4 first extends the clamping jaws 404 from the lower telescopic locking mechanism 402 to the corresponding position tooth-shaped limiting clamping groove 301-3 on the stand 301 (as shown in Figure 4cThe bottom support is realized in the embodiment of the present invention, and the cylinder rod of the hydraulic cylinder 401 is extended upward to make the upper telescopic locking mechanism 403 move upward, and then the upper telescopic locking mechanism 403 extends the claw 404 to the toothed limiting slot 301-3 of the corresponding height to realize top support; after the claw 404 of the lower telescopic locking mechanism 402 retracts, the cylinder rod of the hydraulic cylinder 401 retracts to drive the lower telescopic locking mechanism 402 to move upward, and after moving into place, the claw 404 of the lower telescopic locking mechanism 402 extends to the toothed limiting slot 301-3 of the corresponding height to realize bottom support again; such reciprocating action realizes the climbing of the climbing hydraulic jacking device 4, and the rolling mill 2 is lifted stably as a whole through the synchronous control of the hydraulic cylinder 401 (as shown in FIG. Figure 5 After the rolling mill 2 is lifted, the gantry crane system carries the rolling mill 2 and moves it along the sliding track to the rolling mill installation position (as shown in FIG. Figure 6 Then the climbing hydraulic jacking device 4 is moved vertically downward by the opposite process to the climbing process (as shown); Figure 7 As shown), the rolling mill 2 is dropped into the rolling mill foundation pit and installed in place (as shown Figure 8 、 Figure 8a shown).

[0038] Further, such as Figure 1 As shown, the off-line assembly position A1 of the rolling mill 2 is set in the main transmission span of the rolling mill. The assembled rolling mill 2 first slides along the longitudinal horizontal sliding rail A2 parallel to the rolling center line A6 toward the rolling mill installation position, and then slides along the transverse horizontal sliding rail A3 parallel to the rolling mill train center line A4 toward the integral lifting sliding rail A5; the center line of the integral lifting sliding rail A5 and the rolling center line A6 are located in the same vertical plane; the horizontal sliding system 1 is respectively installed on the longitudinal horizontal sliding rail A2, the transverse horizontal sliding rail A3 and the integral lifting sliding rail A5; the gantry lifting system is arranged on the horizontal sliding system 1 of the integral lifting sliding rail A5.

[0039] Further, such as Figure 2 、 Figure 2a As shown, the horizontal sliding system 1 is composed of a sliding track beam 101, a sliding track 102, a sliding beam 103, a sliding hydraulic jacking device 104 and a connecting rod 106; the sliding track beams 101 are arranged in two side by side, and the two sliding track beams 101 are respectively provided with sliding tracks 102, and the two sliding beams 103 are arranged side by side and span the two sliding tracks 102, and the two sliding beams 103 are connected by a connecting rod 106; one of the sliding beams 103 is connected to the sliding hydraulic jacking device 104; when the rolling mill 2 is carried by the horizontal sliding system 1 for sliding, cushion beams 105 are respectively provided on both sides of the bottom for leveling; the combined lifting tower 3 is installed on the four sliding beams 103.

[0040] Further, the lower telescopic locking mechanism 402 and the upper telescopic locking mechanism 403 have the same structure, and are both composed of a bottom plate, a center support, a top plate, a telescopic hydraulic cylinder and a claw 404; the center support is connected between the bottom plate and the top plate, telescopic hydraulic cylinders are arranged on both sides of the center support, the telescopic hydraulic cylinders are located in the gap between the bottom plate and the top plate, and the extension end of the telescopic hydraulic cylinder is connected with the claw 404.

[0041] Further, the four columns 301 of the combined lifting tower 3 are connected through the circumferentially arranged support structure 304; the support structure 304 includes a top connecting beam, an upper support, a lower support and an inclined support, and the inclined support is arranged between the upper support and the lower support. The upper support, the lower support and the inclined support all adopt a telescopic structure, and flange short sections are arranged between the telescopic sections to facilitate adjustment of different lengths during combination.

[0042] Further, the columns 301 of the combined lifting tower 3 are all composed of a plurality of column modules 301-1 in the height direction; a vertical through groove 301-2 is formed on one side of the column module 301-1, a tooth-shaped limiting clamping groove 301-3 is arranged at the bottom of the vertical through groove 301-2, and the vertical through grooves 301-2 on the column modules 301-1 in the same column 301 form a climbing channel.

[0043] In order to more intuitively embody the present application, the embodiments of the present application are further described in combination with examples. The following examples are only preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can obtain the technical solutions within the technical range disclosed by the present application, including simple changes or equivalent replacements, which are all within the protection scope of the present application.

[0044]

Example

[0045] In this embodiment, the modernization of a large rolling mill is taken as an example. The rolling mill reconstruction project has the characteristics of tight construction period, limited space, great hoisting difficulty, high assembly precision requirement and the like, and the traditional rolling mill rack dismounting and mounting method cannot meet the construction requirements. It is decided to adopt the method of offline assembly and integral sliding and vertical installation, which has short rolling line downtime, convenient installation operation, strong adaptability, safety and reliability, and can greatly shorten the rolling line downtime reconstruction time. It has the following advantages:

[0046] 1) The rolling mill offline assembly is completed in the rolling mill main drive span, the assembly conditions are greatly improved, the offline assembly precision of the rolling mill can be greatly improved, the offline assembly and integral sliding process greatly shorten the installation time, reduce the on-site construction interference and downtime, and through the offline assembly and integral sliding, the demand for complex installation work in the high-risk site is reduced, the construction safety is improved, and the occurrence of safety accidents is reduced.

[0047] 2) After the rolling mill is assembled, a horizontal sliding track is laid, and the rolling mill is slid to above the rolling center line by using a horizontal sliding system. The rolling mill is slid horizontally, and the transportation is more stable.

[0048] 3) A whole lifting sliding track is arranged above the target installation position of the rolling mill and parallel to the rolling center line. A gantry crane system is arranged on the whole lifting sliding track. The rolling mill is lifted, slid and installed in place by using the gantry crane system.

[0049] 4) The gantry crane system is designed in a modular manner. The structure is simple, the assembly is flexible, the lifting and hoisting risk can be greatly reduced, the site adaptability is good, the structure is compact, and the occupied space is small.

[0050] The principle of the rolling mill offline assembly, whole sliding and vertical installation method is as follows:

[0051] 1) A rolling mill assembly site is arranged in a hot rolling main drive span. A temporary assembly rack is arranged. The rolling mill is offline assembled. The whole horizontal sliding condition of the rolling mill is met.

[0052] 2) A longitudinal horizontal sliding track is arranged along the direction parallel to the rolling line. A transverse horizontal sliding track is arranged along the direction parallel to the rolling mill column center line. A horizontal sliding system is arranged. The assembled rolling mill is slid horizontally to the rolling center line by using the horizontal sliding system.

[0053] 3) A whole lifting sliding track is arranged along the rolling center line. A horizontal sliding system and a gantry crane system are arranged on the whole lifting sliding track. The rolling mill is lifted by using the gantry crane system. Then, the rolling mill is slid along the rolling center line to above the target installation position of the rolling mill by using the horizontal sliding system. The rolling mill is lowered to the installation position by the gantry crane system. The rolling mill is installed. The installation of the rolling mill is completed.

[0054] In the embodiment, as shown in Figure 4 , Figure 4aAs shown, the gantry crane system adopts a new multifunctional combined gantry crane system, including a combined lifting tower 3 and a climbing hydraulic jacking device 4; the combined lifting tower 3 is composed of 4 vertical columns 301, 2 longitudinal lifting beams 302, 1 transverse lifting beam 303 and a support structure; the cross section of the combined lifting tower 3 is rectangular, and the 4 vertical columns 301 are arranged at the four corner points of the rectangle; the vertical column 301 is composed of multiple vertical column modules 301-1 assembled along the height direction; on the longitudinal two sides of the combined lifting tower 3, the two vertical columns 301 on the same side are connected through a longitudinal support structure; on the transverse two sides of the combined lifting tower 3, the two vertical columns 301 on the same side are connected through a transverse support structure; a vertical through groove 301-2 is formed on one side of the vertical column module 301-1, a tooth-shaped limiting groove 301-3 is arranged at the bottom of the vertical through groove 301-2, and the vertical through grooves 301-2 on the vertical column modules 301-1 in the same vertical column 301 form a climbing channel; the climbing channels of the two vertical columns 301 on the longitudinal same side of the combined lifting tower 3 are oppositely arranged, and the climbing hydraulic jacking device 4 is movably installed in the corresponding climbing channel; the climbing hydraulic jacking device 4 is composed of a hydraulic cylinder 401, a lower telescopic locking mechanism 402 and an upper telescopic locking mechanism 403; the hydraulic cylinder 401 is vertically arranged, the lower end of the hydraulic cylinder 401 is connected with the lower telescopic locking mechanism 402, and the upper end of the hydraulic cylinder 401 is connected with the upper telescopic locking mechanism 403; the lower telescopic locking mechanism 402 and the upper telescopic locking mechanism 403 are respectively provided with a horizontally telescopic claw 404, and the claw 404 is used for cooperating with the tooth-shaped limiting groove 301-3 for positioning; the longitudinal lifting beam 302 is arranged between the two vertical columns 301 on the longitudinal same side of the combined lifting tower 3, and the two ends of the longitudinal lifting beam 302 are respectively connected with the upper telescopic locking mechanisms 403 of the two corresponding climbing hydraulic jacking devices 4; the transverse lifting beam 303 spans between the two longitudinal lifting beams 302.

[0055] The lower telescopic locking mechanism 402 and the upper telescopic locking mechanism 403 have the same structure and are both composed of a bottom plate, a center support, a top plate, a telescopic hydraulic cylinder and a claw 404; the bottom plate and the top plate are connected through the center support, the telescopic hydraulic cylinder is arranged in the gap between the bottom plate and the top plate, and the extension end of the telescopic hydraulic cylinder is connected with the claw 404.

[0056] The support structure 304 comprises longitudinal support structures and transverse support structures. The longitudinal support structures comprise longitudinal top connecting beams, upper longitudinal supports, lower longitudinal supports and longitudinal inclined supports; the longitudinal top connecting beams are arranged at the top of corresponding two columns 301; the lengths of the upper longitudinal supports, the lower longitudinal supports and the longitudinal inclined supports are all capable of telescopic adjustment; the longitudinal inclined supports are arranged between the upper longitudinal supports and the lower longitudinal supports. The transverse support structures comprise transverse top connecting beams, upper transverse supports, lower transverse supports and transverse inclined supports; the lengths of the upper transverse supports, the lower transverse supports and the transverse inclined supports are all capable of telescopic adjustment, and the transverse inclined supports are arranged between the upper transverse supports and the lower transverse supports.b

[0057] In this embodiment, as shown in Figure 2 、 Figure 2a Fig. 1, the horizontal sliding system 1 is composed of sliding track beams 101, sliding tracks 102, sliding beams 103, sliding hydraulic thrust devices 104 and connecting rods 106; the sliding track beams 101 are arranged side by side, the sliding tracks 102 are arranged on the two sliding track beams 101 respectively, the two sliding beams 103 are arranged across the two sliding tracks 102, and the two sliding beams 103 are connected by the connecting rod 106; one sliding beam 103 is connected with the sliding hydraulic thrust device 104; the combined lifting tower 3 is installed on the four sliding beams 103.

[0058] In this embodiment, the installation process of the rolling mill offline assembled whole sliding vertical descending is as follows:

[0059] I. Construction preparation

[0060] 1. Technical preparation: including preparation of hoisting scheme, calculation of all force-bearing components such as horizontal sliding device, gantry hoisting system, body of equipment and lifting lug, lifting appliance and rigging.

[0061] 2. Machine preparation: including configuration of sliding device, configuration of gantry hoisting system, preparation of lifting appliance and rigging, preparation of installation tools.

[0062] 3. Personnel preparation: including training of personnel participating in hoisting operation, making each operation personnel clearly understand the hoisting scheme, understand the responsibilities of their own post, and ensuring that all operation personnel have the ability to complete their own responsible work tasks.

[0063] 4. Site preparation: including arrangement and confirmation of rolling mill temporary assembly site, tool box arrangement, lifting sliding support foundation, equipment placement site, rolling mill whole sliding route, etc.

[0064] II. Erection of temporary assembly stand

[0065] 1. Slippage route selection: construction site closed management, layout of assembly site, measurement of slippage path, good marking, horizontal slippage path is divided into two sections, one section is longitudinal horizontal slippage section parallel to the rolling center line, and the other section is transverse horizontal slippage section parallel to the rolling mill row center line; the rolling mill whole slippage path is shown in Figure 1 .

[0066] 2. Installation of temporary assembly stand: according to the rolling mill slippage path, the installation position of the temporary assembly stand is determined, the slippage beam is arranged on the slippage track, the cushion beam for supporting the rolling mill base is arranged on the slippage beam, the rolling mill temporary assembly stand is composed (as shown in Figure 3 , Figure 3a ), after the rolling mill off-line assembly is completed, the rolling mill is slippage together with the rolling mill temporary assembly stand. The center line deviation of the slippage track is not more than 2mm, the track gauge allows deviation of 2mm, and the track elevation allows deviation of ±3mm. The elevation and levelness of the cushion beam 105 are adjusted according to the size of the rolling mill base to meet the rolling mill slippage space requirements, and the levelness error is 2mm / 1000mm.

[0067] 3. Rolling mill off-line assembly;

[0068] 1) Rolling mill base installation: pad iron is arranged above the cushion beam, pad iron level is adjusted, rolling mill base is hoisted by workshop travelling crane, the elevation, center line and levelness of the rolling mill base are measured, and the levelness error is 0.05mm / 1000mm. The levelness of the base can be adjusted by using a pair of inclined pad irons.

[0069] 2) Rolling mill rack installation: rolling mill rack is hoisted and installed in place by using workshop travelling crane in cooperation with flat beam, and then upper cross beam and lower cross beam of the rolling mill are installed, the contact surfaces of the upper cross beam, the lower cross beam and the rolling mill rack are tightly closed, and the connecting bolts are fastened. The contact clearance of the plane and side surface of the combination of the rolling mill rack and the rolling mill base, the clearance of the joint surface of the rolling mill cross beam and the rolling mill rack, the perpendicularity and levelness of the rolling mill rack, etc. are checked, and the rolling mill is qualified if the requirements of the specification are met.

[0070] 3) Installation of hydraulic adjustment device and rolling mill body pipe fitting and other rolling mill accessories: after the rolling mill rack is accepted, the hydraulic adjustment device and other equipment are installed, the rolling mill body adopts integrated pipe fitting system, after the pipe fitting is completed, the integrated pipe fitting system is directly installed on the rolling mill rack, the cleanliness of the pipeline is paid attention to during the installation of the rolling mill pipe fitting system, dustproof measures are taken for the pipe opening, the special lifting appliance for the rolling mill is connected with the base, and the preparation for the horizontal slippage of the rolling mill is completed.

[0071] 4. Old rolling mill disassembly and rolling mill foundation treatment;

[0072] The old rolling mill is disassembled by using the rolling mill disassembly technology, setting the lifting point, disassembling the rolling mill in blocks, and removing the shell first, then the upper beam, the frame and the base in the order from top to bottom. The frame can be cut in the middle to reduce the single lifting weight and meet the space requirements for lifting. After the old rolling mill is disassembled, the site is cleaned and the rolling mill foundation is processed.

[0073] 5. The center marker plate and the installation reference point are buried;

[0074] After the foundation is accepted, the rolling mill installation center marker plate and the permanent reference point are buried according to the civil construction line, and the measurement results are recorded.

[0075] 6. Installation of the pad plate;

[0076] The rolling mill base pad plate is installed by using the grouting pad plate method.

[0077] 7. Rolling mill overall horizontal sliding;

[0078] 1) Rolling mill overall sliding preparation: from the temporary assembly platform to the first segment horizontal sliding end, the sliding track is laid parallel to the sliding center line, the horizontal sliding device is positioned after the pipeline is connected, the sliding hydraulic thrust device is tested under no load, and after confirming that the action is correct, the sliding can be performed;

[0079] 2) Installation of the gantry crane system: the components of the gantry crane system are lifted by the workshop crane, and when the assembly of the gantry crane system is completed, a passage is reserved on the side of the rolling mill horizontal sliding.

[0080] 3) Rolling mill overall horizontal sliding: start the horizontal sliding system and begin the rolling mill overall sliding, monitor the stability of the rolling mill and the synchronization of the sliding during the sliding process, and the end of the first longitudinal horizontal sliding is located at the rolling mill row center line. After the rolling mill is slid to the rolling mill row center line, the rolling mill is turned once, and then the rolling mill is slid along the rolling mill row center line to the lifting position during the second transverse horizontal sliding.

[0081] 8. Rolling mill overall lifting, sliding and vertical descending installation;

[0082] After the rolling mill is horizontally slid to the rolling center line, the transverse lifting beam is installed through the rolling mill window, and then the longitudinal support structure is installed. The gantry crane system carries the rolling mill through the transverse lifting beam, and the overall lifting preparation is completed.

[0083] Lifting process control points:

[0084] 1) Synchronous lifting point setting: A set of displacement synchronization sensors is arranged at each climbing hydraulic lifting device to measure the lifting displacement synchronization of each climbing hydraulic lifting device during lifting. The main control computer forms a closed loop system of "sensor-computer-pump control valve-lifter control valve-hydraulic cylinder" according to the displacement detection signals of all sensors and the difference value thereof, to control the synchronization of the whole lifting process.

[0085] 2) Lifting oil pressure equalization: The climbing hydraulic lifting device at each lifting point is applied with constant oil pressure in the formal lifting stage, to ensure that all lifting points are lifted upward with constant driving force.

[0086] 3) Lifting step loading: The lifting process is carried out in a trial manner, the state of the rolling mill and the climbing hydraulic lifting device is observed and monitored, and it is confirmed that the conditions meet the simulation condition calculation and design conditions, to ensure the safety of the lifting process.

[0087] 4) Lifting step loading: During the trial lifting, the step loading is carried out according to the counterforce value of each lifting point calculated in advance, the hydraulic cylinder pressure at each lifting point should be slowly increased in steps, and the total loading value is 20%, 40%, 60%, 80% in turn; under the condition that no abnormality is found in each part, it can be continued to 90%, 95%, 100%, until the rolling mill is lifted to the height completely separated from the sliding device.

[0088] 5) Equipment off-ground inspection: After the rolling mill is lifted to 100 mm above the temporary assembly stand, the position is locked by the climbing hydraulic lifting device, and the bottom is additionally provided with a pad and other protective measures, then a comprehensive inspection is carried out (including the lifting point structure, temporary support structure and climbing hydraulic lifting device, etc.), and the inspection results are recorded in writing, and only when all the inspections are correct, the formal lifting can be carried out.

[0089] 6) Posture detection and adjustment: The distance from the ground of each lifting point is detected by measuring instruments, and the relative height difference of each lifting point is calculated. The height of each lifting point is adjusted by the climbing hydraulic lifting device, so that the rolling mill reaches the lifting requirement.

[0090] 7) Overall synchronous lifting: The height of each lifting point after adjustment is taken as the new lifting starting position, and each displacement sensor is reset. During the lifting process of the rolling mill, the posture of the rolling mill is maintained until it is lifted to the vicinity of the set height.

[0091] 9) Fine adjustment of the lifting process: During the lifting and positioning process of the rolling mill, fine adjustment of the height is needed when the aerial posture is adjusted. Before the fine adjustment starts, the computer synchronization control system is switched from automatic mode to manual mode. According to the needs, the hydraulic cylinders of all lifting points are synchronously operated (up or down), or a single hydraulic cylinder is adjusted in a fine manner (fine adjustment, the adjustment accuracy can reach millimeter level), to meet the accuracy requirements of installation.

[0092] 9. Mill lifting and sliding;

[0093] The mill is slid to the target installation position, the mill is vertically lowered to the position by the gantry crane system (as shown in Figure 8 、 Figure 8a ), the gantry crane system and the horizontal sliding system are removed after installation, and the site is cleaned. Meanwhile, the position of the installed mill is adjusted and fixed, mainly the height level and the longitudinal and transverse center lines of the mill are adjusted, then the anchor bolts are fastened, and after the adjustment and acceptance are qualified, the secondary grouting of the base is performed. Then the installation of the energy medium pipeline, the backup roll and the work roll and other accessories is performed, and finally the single unit debugging, linkage test run and load test run are performed.

[0094] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art, according to the technical scheme and the inventive concept of the present application, within the technical range disclosed by the present application, makes equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A method for offline assembly of a rolling mill with overall sliding and vertical descent, comprising an offline assembly step of the rolling mill, an overall sliding step of the rolling mill, and a vertical descent installation step of the rolling mill; characterized in that: The overall sliding step of the rolling mill and the vertical lowering and installation step of the rolling mill both adopt a gantry lifting system; the gantry lifting system is arranged on the horizontal sliding system and consists of a combined lifting tower and a climbing hydraulic jacking device; the combined lifting tower is provided with 4 columns; each column is provided with a set of climbing hydraulic jacking devices; the climbing hydraulic jacking device is composed of a lower telescopic locking mechanism, a hydraulic cylinder and an upper telescopic locking mechanism connected in sequence; the lower telescopic locking mechanism and the upper telescopic locking mechanism are respectively provided with a laterally retractable claw; two longitudinal lifting beams are arranged in parallel, and the two ends of the longitudinal lifting beams are respectively connected to the upper telescopic locking mechanism of the corresponding climbing hydraulic jacking device; the transverse hanging beam spans between the two longitudinal lifting beams; The offline assembly position of the rolling mill is set in the main transmission span of the rolling mill. After assembly, the rolling mill first slides along the longitudinal horizontal sliding track parallel to the rolling center line toward the rolling mill installation position, and then slides along the transverse horizontal sliding track parallel to the center line of the rolling mill train toward the integral lifting sliding track. The center line of the integral lifting sliding track and the rolling center line are located in the same vertical plane. The horizontal sliding system is installed on the longitudinal horizontal sliding track, the transverse horizontal sliding track and the integral lifting sliding track respectively. The gantry crane system is installed on the horizontal sliding system of the integral lifting sliding track. The lower telescopic locking mechanism has the same structure as the upper telescopic locking mechanism, and is composed of a bottom plate, a central pillar, a top plate, a telescopic hydraulic cylinder, and a clamping claw. The bottom plate and the top plate are connected by the central pillar, and telescopic hydraulic cylinders are respectively provided on both sides of the central pillar. The telescopic hydraulic cylinders are located in the gap between the bottom plate and the top plate, and the protruding ends of the telescopic hydraulic cylinders are connected to the clamping claws. After the rolling mill is assembled at the offline assembly position, it is transported to the lifting position by the horizontal sliding system; before the lifting begins, the climbing hydraulic jacking device is located at the starting lifting height; after the rolling mill enters the combined lifting tower, the transverse lifting beam is passed under the rolling mill beam and then connected to the longitudinal lifting beam; when the rolling mill is lifted, the climbing hydraulic jacking device first extends the claws of the lower telescopic locking mechanism to the toothed limit slots on the corresponding position columns to achieve bottom support, and then the cylinder rod of the hydraulic cylinder extends upward to move the upper telescopic locking mechanism upward, and then the upper telescopic locking mechanism extends the claws to the toothed limit slots at the corresponding height to achieve top support After the claws of the lower telescopic locking mechanism retract, the cylinder rod of the hydraulic cylinder retracts to drive the lower telescopic locking mechanism to move upward. After moving into place, the claws of the lower telescopic locking mechanism extend into the toothed limit slot of the corresponding height to realize the bottom support again. Such reciprocating action realizes the climbing of the climbing hydraulic jacking device, and the rolling mill is lifted steadily as a whole through the synchronous control of the hydraulic cylinder. After the rolling mill is lifted, the gantry crane system carries the rolling mill along the sliding track to the rolling mill installation position. Then the climbing hydraulic jacking device adopts the opposite process of climbing to move vertically downward, and drops the rolling mill into the rolling mill foundation pit for installation.

2. The method for installing a rolling mill offline assembly with overall sliding and vertical descent according to claim 1, characterized in that: The horizontal sliding system consists of a sliding track beam, a sliding track, a sliding beam, a sliding hydraulic jacking device and a connecting rod; the sliding track beams are arranged in two side by side, and the two sliding track beams are respectively provided with sliding tracks. The two sliding beams are arranged side by side and span the two sliding tracks, and the two sliding beams are connected by a connecting rod; one of the sliding beams is connected to the sliding hydraulic jacking device; when the rolling mill is carried by the horizontal sliding system for sliding, pad beams are provided on both sides of the bottom for leveling; the combined lifting tower is installed on the four sliding beams.

3. The method for installing a rolling mill offline by sliding and vertically descending as a whole according to claim 1, characterized in that: The four columns of the combined lifting tower are connected by a circumferentially arranged support structure; the support structure includes a top connecting beam, an upper support, a lower support and an inclined support, and the inclined support is arranged between the upper support and the lower support; The upper support, the lower support and the oblique support are all retractable structures.

4. The method for installing a rolling mill offline by sliding and vertically descending as a whole according to claim 1 or 3, characterized in that: The columns of the combined lifting tower are assembled in the height direction by combining multiple column modules; a vertical through groove is opened on one side of the column module, and a tooth-shaped limit slot is set at the bottom of the vertical through groove. The vertical through grooves on each column module in the same column form a climbing channel.

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