Replacing device and replacing method for bending and stringing roller hydraulic cylinder of four-high rolling mill

Abstract

The invention discloses a device and method for replacing a roll bending and stringing hydraulic cylinder of a four-roll mill. The device comprises a tackle, a lifting frame assembly, a sliding seat capable of moving back and forth on a roll replacing guide rail and an adapter plate assembly used for being detachably connected to the roll bending and stringing hydraulic cylinder. The tackle is movably assembled on the sliding seat so as to ensure that the tackle can move back and forth between the inlet side and the outlet side of the sliding seat; and the hoisting frame assembly is assembled on the tackle in a liftable manner and is used for hooking the adapter plate assembly, so that the bending and stringing roller hydraulic cylinder can be quickly, stably and conveniently replaced, the manpower is saved, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical steel rolling, and in particular to a device and method for replacing a bending roller hydraulic cylinder of a four-roller rolling mill. Background Art

[0002] The hydraulic cylinder for bending and shifting the work rolls is one of the core actuators in a strip mill. It integrates the functions of bending (bending) and axial shifting (roll shifting) the work rolls to achieve two crucial rolling objectives: plate shape control and uniform roll wear. Therefore, the performance of the hydraulic cylinder directly affects the mill's product quality (plate shape), production efficiency (such as roll consumption and roll change time), and operational stability.

[0003] The bending roller hydraulic cylinder works in a high temperature, high load, and high impact steel rolling environment, and is prone to functional failure. Therefore, the bending roller hydraulic cylinder needs to be replaced in time to ensure rapid resumption of production. However, there are many problems in the disassembly process of the bending roller hydraulic cylinder:

[0004] 1. The hydraulic cylinder of the bending roller is installed in the window of the rolling mill arch and has a large deadweight. The internal space of the rolling mill limits the use of lifting equipment. It is often necessary to use a small overhead crane (travel crane) in conjunction with a hand hoist, hydraulic jack, etc. for fine tuning, which is inefficient and high-risk.

[0005] 2. When dismantling an old cylinder or installing a new one, it is generally difficult to keep the cylinder stable because the stress point is on the side. Especially when installing a new cylinder, the cylinder weighing several tons needs to be precisely aligned with the pin hole on the archway, which is extremely difficult to operate. Summary of the Invention

[0006] To this end, in order to solve the above problems, the present invention provides a device and method for replacing the bending roller hydraulic cylinder of a four-roll rolling mill, which can quickly, stably and conveniently replace the bending roller hydraulic cylinder to save manpower and improve maintenance efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] The present invention provides a device for replacing a bending roller hydraulic cylinder of a four-roll rolling mill, comprising a pulley, a lifting frame assembly, a slide that can move back and forth on a roll-changing guide rail, and an adapter plate assembly for detachably connecting to the bending roller hydraulic cylinder; the pulley is movably assembled on the slide to ensure that the pulley can move back and forth between the inlet side and the outlet side of the slide; the lifting frame assembly is liftably assembled on the pulley and is used to hook the adapter plate assembly.

[0009] Furthermore, a mounting groove cooperating with the pulley is provided in the slide seat, and two opposite groove walls of the mounting groove are respectively provided with track grooves, and the pulley is movably assembled in the track grooves.

[0010] Further, the sliding seat is provided with a wear plate for ensuring smooth sliding of the sliding seat on the roll changing guide rail.

[0011] Further, the outer wall of the sliding seat is provided with a connecting pin for connecting the pin hole of the roll changing trolley.

[0012] Further, the trolley, the lifting frame assembly and the sliding seat are respectively provided with lifting lugs.

[0013] Further, the trolley comprises a trolley frame, a top seat detachably assembled at the top end of the trolley frame and a first support wheel set assembled at the bottom of the trolley frame; the first support wheel set is movably assembled in the track groove; the opposite inner walls of the trolley frame are provided with a second support wheel set for ensuring the stability of the lifting frame assembly in the trolley frame in up and down movement.

[0014] Further, the lifting frame assembly comprises a hook and a liftable lifting frame, the hook is assembled to the lifting frame for hooking the adapter plate assembly; the opposite outer walls of the lifting frame are respectively provided with guide rail grooves extending upward and downward, and the second support wheel set is movably assembled in the guide rail grooves.

[0015] Further, the lifting frame is provided with a through hole away from the top center of the sliding seat for the chain of the hand chain block to pass through; the opposite inner walls of the lifting frame are provided with limit blocks symmetrically distributed in the center near the bottom side of the sliding seat for limiting the transverse movement of the adapter plate assembly.

[0016] Further, the adapter plate assembly comprises an adapter plate, a first pad, a second pad, a third pad and a detachable screw for fastening the adapter plate to the bent string roll hydraulic cylinder, the adapter plate is provided with a plurality of process holes; the first pad and the second pad are respectively arranged at the upper and lower ends of one side of the adapter plate, and the third pad is arranged at the other side of the adapter plate; the first pad and the hook cooperate to ensure that the adapter plate is hung on the lifting frame; the second pad and the limit block cooperate to limit the transverse movement of the adapter plate; the third pad has a boss for supporting the bent string roll hydraulic cylinder; the first pad, the second pad and the third pad are respectively installed in multiple positions through the process holes to adapt to the corresponding side replacement requirements of the hydraulic cylinder.

[0017] The present invention provides a replacement method for the bending roller hydraulic cylinder replacement device of the above-mentioned four-roll rolling mill, comprising the following steps: S1, hoisting the bending roller hydraulic cylinder replacement device to the operating side of the four-roll rolling mill, and placing the slide on the roll-changing guide rail; S2, hoisting the adapter plate assembly to the lifting frame assembly, and locating it on the inlet side or outlet side of the slide; S3, connecting the roll-changing trolley to the bending roller hydraulic cylinder replacement device, and pushing the bending roller hydraulic cylinder replacement device to the position of the bending roller hydraulic cylinder that needs to be replaced; S4, adjusting the orientation of the adapter plate assembly by adjusting the position of the slide and the lifting frame assembly, until the process hole of the adapter plate assembly is aligned with the preset hole on the bending roller hydraulic cylinder to be disassembled, and then locking the position of the slide and the lifting frame assembly to ensure that the adapter plate assembly The position of the parts is locked; S5, move the pulley to the entrance or exit side of the slide, so that the adapter plate assembly slowly approaches the bending roller hydraulic cylinder to be disassembled until the two fit together, and fasten the adapter plate assembly to the bending roller hydraulic cylinder by removing the screws, and then remove the connecting screws between the bending roller hydraulic cylinder and the rolling mill arch from the process holes reserved on the adapter plate assembly; S6, lift the lifting frame assembly slightly, and then move the pulley to the exit or entrance side of the slide to separate the bending roller hydraulic cylinder from the rolling mill arch; S7, then pull the roll changing trolley to drive the bending roller hydraulic cylinder replacement device to move accordingly together with the bending roller hydraulic cylinder, and pull it out of the rolling mill arch, and disconnect the connection between the bending roller hydraulic cylinder replacement device and the bending roller hydraulic cylinder by hoisting on the roll changing track.

[0018] The technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention designs a bending roller hydraulic cylinder replacement device with small size, simple structure, comprehensive functions and convenient operation, and can quickly, stably and conveniently replace the bending roller hydraulic cylinder to save manpower and improve maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a hydraulic cylinder replacement device for a four-high rolling mill in an inlet-side mode according to an embodiment;

[0021] Figure 2 The figure shows a cross-sectional view of the bending roller hydraulic cylinder during disassembly and assembly in the embodiment;

[0022] Figure 3 The figure shows the schematic diagram of the disassembly and assembly of the bending roller hydraulic cylinder in the embodiment;

[0023] Figure 4 Shown is a schematic diagram of the slide in the embodiment;

[0024] Figure 5 Shown is a schematic diagram of a pulley in an embodiment;

[0025] Figure 6 Shown is a schematic diagram of a lifting frame assembly in an embodiment;

[0026] Figure 7 Shown are schematic diagrams of the front and back sides of the adapter plate assembly in the embodiment;

[0027] Figure 8 Shown is a schematic diagram of a bending roll hydraulic cylinder replacement device of a four-high rolling mill in the outlet side mode in an embodiment. DETAILED DESCRIPTION

[0028] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figures 1 to 7 This embodiment provides a bending roller hydraulic cylinder replacement device for a four-roll mill (hereinafter referred to as the bending roller hydraulic cylinder replacement device 100), which is suitable for disassembly and replacement of the bending roller hydraulic cylinder of a four-roll mill in the field of metallurgical steel rolling.

[0031] like Figures 1 to 3 As shown, the bending roller hydraulic cylinder replacement device 100 of this embodiment includes a pulley 2, a lifting frame assembly 3, a slide 1 that can move back and forth on the roll-changing guide rails, and an adapter plate assembly 4 for removably connecting to the bending roller hydraulic cylinder 5. This ensures that the entire bending roller hydraulic cylinder replacement device 100 is small enough to easily enter the rolling mill arch without being restricted by the space therein. Of course, the roll-changing guide rails extend parallel to the forward and backward directions, and the roll-changing trolley also moves in the forward and backward directions.

[0032] The pulley 2 is movably assembled on the slide 1 to ensure that the pulley 2 can move back and forth in the left and right directions between the inlet side 11 and the outlet side 12 of the slide 1, and the lifting frame assembly 3 is liftably assembled on the pulley 2 and is used to hook the adapter plate assembly 4.

[0033] In this embodiment, Figure 4 As shown, a mounting groove 13 for matching the pulley 2 is provided in the slide 1, and two front and rear opposite groove walls of the mounting groove 13 are respectively provided with track grooves 14, and the extension direction of the track grooves 14 is parallel to the left and right directions.

[0034] like Figure 5As shown, the pulley 2 includes a pulley frame 21, a top seat 22 detachably mounted on the top of the pulley frame 21, and a first support wheel group 23 mounted on the bottom of the pulley frame 21. The first support wheel group 23 is movably mounted on the track groove 14. At this time, the track groove 14 serves as the left and right running tracks of the first support wheel group 23, that is, the pulley 2 can move left and right between the entrance side 11 and the exit side 12.

[0035] like Figure 6 As shown, the lifting frame assembly 3 includes a hook 31 and a liftable lifting frame 32, and the lifting frame 32 is installed in the pulley frame 21 through the opening at the top of the pulley frame 21, and then the top seat 22 is installed in the top opening of the pulley frame 21, and the hook 31 is assembled on the lifting frame 32 to hook the adapter plate assembly 4.

[0036] More specifically, Figure 1 and Figure 4 As shown, the rear end outer wall of the slide 1 is provided with a connecting pin 16 for connecting to the pin hole of the roll changing trolley. When the connecting pin 16 is installed in the pin hole of the roll changing trolley, it can ensure that the bending roll hydraulic cylinder replacement device 100 can enter and exit the rolling mill arch under the push of the roll changing trolley.

[0037] like Figure 5 As shown, the two front and rear opposite inner walls of the pulley frame 21 are provided with a second supporting wheel group 24, and the two front and rear opposite outer walls of the lifting frame 32 are respectively provided with guide rail grooves 321 extending up and down. The second supporting wheel group 24 is movably assembled in the corresponding guide rail grooves 321, and the lifting frame 32 and the hook 31 are driven to rise and fall synchronously by the driving force of the hand hoist 7, and the guide rail grooves 321 and the second supporting wheel group 24 cooperate to ensure that the lifting frame assembly 3 always remains stable when moving up and down.

[0038] like Figure 6 As shown, a through hole 322 is opened at the top center of the lifting frame 32 away from the slide 1 for the chain of the hand hoist 7 to pass through and be connected to the lifting frame 32.

[0039] In this specific embodiment, Figure 7 As shown, the adapter plate assembly 4 includes an adapter plate 41 and a plurality of first pads 42 , second pads 43 , third pads 44 and disassembly screws 45 , and the disassembly screws 45 are used to fasten the adapter plate 41 to the bending roller hydraulic cylinder 5 .

[0040] The adapter plate 41 is provided with a plurality of process holes 46 , and the first cushion block 42 and the second cushion block 43 are respectively installed at the upper and lower ends of one side of the adapter plate 41 through the process holes 46 .

[0041] like Figure 6As shown, two front and rear opposite inner walls of the hoisting frame 32 are respectively provided with limit blocks 323 which are centrally symmetrically distributed and close to the bottom side of the sliding base 1.

[0042] The first pad 42 and the hook 31 are cooperated to ensure that the adapter plate 41 is hung on the hoisting frame 32, and the second pad 43 and the limit block 323 are cooperated to limit the transverse movement of the adapter plate assembly 4 in the front and rear directions.

[0043] The third pad 44 is installed on the other side of the adapter plate 41 through the process hole 46, and the third pad 44 has a boss for supporting the bending string roller hydraulic cylinder 5.

[0044] Therefore, the first pad 42, the second pad 43 and the third pad 44 are respectively installed in multiple positions through the process hole 46 to adapt to the corresponding side replacement requirements of the hydraulic cylinder, so as to solve the adaptability problem caused by the large number of bending string roller hydraulic cylinders 5 of the single-stand rolling mill and the different relative positions of the hole positions used for dismounting and mounting of different hydraulic cylinders.

[0045] In addition, the trolley 2, the hoisting frame assembly 3 and the sliding base 1 are respectively provided with lifting lugs 6. Specifically, the two front and rear opposite outer walls of the trolley frame 21 are also provided with lifting ring screws 211, which are used for cooperation between the hand-operated hoist 7 and the lifting lug 6 of the sliding base 1. The lower end of the top base 22 is provided with a lifting lug 6, which is used as a lifting point of the hand-operated hoist 7. The bottom of the hoisting frame 32 is also provided with a lifting lug 6, which is cooperated with the lifting lug 6 of the top base 22, the shackle 324 and the hand-operated hoist 7 to drive the hoisting frame 32 to move up and down. The outer wall of the sliding base 1 is also provided with symmetrically distributed lifting lugs 6, which are used for cooperation between the lifting ring screw 211 and the hand-operated hoist 7 to pull the trolley 2 to move left and right.

[0046] Further preferably, as shown in Figure 1 and Figure 4 As shown, the bottom of the sliding base 1 is provided with a wear plate 15, which is used to ensure smooth sliding of the sliding base 1 on the roll changing guide rail.

[0047] The bending string roller hydraulic cylinder replacement device 100 is adopted in the embodiment, and the bending string roller hydraulic cylinder 5 is dismounted and reinstalled and replaced in the entry side mode as shown in Figures 1 to 3 The specific replacement method includes the following steps:

[0048] Step S1, hoist the bending string roller hydraulic cylinder replacement device 100 to the operation side of the four-roller rolling mill, and accurately place the sliding base 1 on the roll changing guide rail.

[0049] Step S2, the adapter plate assembly 4 in the entry side mode is hoisted on the hook 31 of the lifting frame assembly 3 by the workshop crane, so as to be close to the trolley 2 without falling, and located at the entry side 11 of the sliding seat 1.

[0050] Step S3, the roll changing trolley is connected with the bending string roll hydraulic cylinder replacement device 100, and the bending string roll hydraulic cylinder replacement device 100 is pushed to the position of the bending string roll hydraulic cylinder 5 to be replaced.

[0051] Step S4, the orientation of the adapter plate assembly 4 is adjusted by adjusting the positions of the sliding seat 1 and the lifting frame assembly 3, until the process hole 46 of the adapter plate 41 is aligned with the preset hole on the bending string roll hydraulic cylinder 5 to be removed, and then the positions of the sliding seat 1 and the lifting frame assembly 3 are locked, so as to lock the position of the adapter plate assembly 4, which is convenient for quick alignment and reduces the operation difficulty.

[0052] Step S5, the trolley 2 is continuously moved to the entry side 11 of the sliding seat 1, so that the adapter plate assembly 4 slowly approaches the bending string roll hydraulic cylinder 5 to be removed, until the two are attached, and the adapter plate assembly 4 is fastened to the bending string roll hydraulic cylinder 5 by the disassembly screw 45, and then the connecting screw between the bending string roll hydraulic cylinder 5 and the rolling mill housing is removed from the process hole 46 reserved on the adapter plate assembly 4.

[0053] Step S6, the lifting frame assembly 3 is slightly lifted, and then the trolley 2 is moved to the exit side 12 of the sliding seat 1, so as to separate the bending string roll hydraulic cylinder 5 from the rolling mill housing.

[0054] Step S7, then pull the roll changing trolley to drive the bending string roll hydraulic cylinder replacement device 100 and the bending string roll hydraulic cylinder 5 to move correspondingly, and pull them out of the rolling mill housing, and disconnect the connection between the bending string roll hydraulic cylinder replacement device 100 and the bending string roll hydraulic cylinder 5 on the roll changing track by hoisting, so as to complete the disassembly of the old bending string roll hydraulic cylinder 5.

[0055] In addition, the installation steps of the new bending string roll hydraulic cylinder 5 are performed in the reverse order of the above disassembly steps, so that the installation of the new bending string roll hydraulic cylinder 5 is completed, which will not be described in detail here.

[0056] In summary, the embodiment designs a bending string roll hydraulic cylinder replacement device 100 which is small in size, simple in structure, comprehensive in function and convenient to operate, and can quickly, stably and conveniently replace the bending string roll hydraulic cylinder 5, so as to save manpower and improve the maintenance efficiency.

[0057] Of course, in other embodiments, as shown in Figure 8 If the exit side mode is switched, the adapter plate assembly 4 needs to be reassembled before the bending string roll hydraulic cylinder 5 is disassembled and replaced, so as to correspond to the exit side mode, and the subsequent operation steps are similar to the entry side mode, which will not be described in detail here.

[0058] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A device for replacing a bending roller hydraulic cylinder of a four-high rolling mill, characterized in that: It includes a pulley, a lifting frame assembly, a slide that can move back and forth on the roller changing guide rail, and an adapter plate assembly for detachably connecting to the bending roller hydraulic cylinder; The pulley is movably mounted on the slide to ensure that the pulley can move back and forth between the inlet side and the outlet side of the slide; the lifting frame assembly is liftably mounted on the pulley and is used to hook the adapter plate assembly.

2. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 1, characterized in that: The slide seat is provided with a mounting groove matching the pulley, and two opposite groove walls of the mounting groove are respectively provided with track grooves, and the pulley is movably assembled in the track grooves.

3. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 2, characterized in that: The slide is provided with a wear-resistant plate, and the wear-resistant plate is used to ensure that the slide slides smoothly on the roller-changing guide rail.

4. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 2, characterized in that: The outer wall of the slide is provided with a connecting pin for connecting to the pin hole of the roller changing trolley.

5. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 1, characterized in that: The pulley, the lifting frame assembly and the sliding seat are respectively provided with lifting eyes.

6. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to any one of claims 1 to 5, characterized in that: The pulley includes a pulley frame, a top seat detachably mounted on the top of the pulley frame, and a first supporting wheel group mounted on the bottom of the pulley frame; the first supporting wheel group is movably mounted in the track groove; a second supporting wheel group is provided on the relative inner wall of the pulley frame to ensure the stability of the lifting frame assembly moving up and down in the pulley frame.

7. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 6, characterized in that: The lifting frame assembly includes a hook and a liftable lifting frame, the hook is assembled on the lifting frame to hook the adapter plate assembly; the relative outer walls of the lifting frame are respectively provided with guide rail grooves extending upward and downward, and the second support wheel group is movably assembled on the guide rail grooves.

8. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 7, characterized in that: A through hole is provided in the top center of the lifting frame away from the slide for the chain of the hand hoist to pass through; the relative inner wall of the lifting frame is provided with a centrally symmetrically distributed limit block near the bottom side of the slide to limit the lateral movement of the adapter plate assembly.

9. The device for replacing the bending roller hydraulic cylinder of a four-high rolling mill according to claim 8, characterized in that: The adapter plate assembly includes an adapter plate, a first pad, a second pad, a third pad and a disassembly screw for fastening the adapter plate to the bending roller hydraulic cylinder, and the adapter plate is provided with a plurality of process holes; the first pad and the second pad are respectively arranged at the upper and lower ends of one side of the adapter plate, and the third pad is arranged on the other side of the adapter plate; the first pad and the hook cooperate together to ensure that the adapter plate is hung on the lifting frame; the second pad and the limit block cooperate together to limit the lateral movement of the adapter plate; the third pad has a boss for supporting the bending roller hydraulic cylinder; the first pad, the second pad and the third pad are respectively installed in multiple positions through the process holes to respectively adapt to the replacement requirements of the corresponding sides of the hydraulic cylinder.

10. A method for replacing a bending roller hydraulic cylinder of a four-high rolling mill using the device for replacing bending rollers according to any one of claims 1 to 9, characterized in that: The steps include: S1: Hoist the bending roller hydraulic cylinder replacement device to the operating side of the four-high rolling mill and place the slide on the roll changing guide rail; S2, hoisting the adapter plate assembly onto the lifting frame assembly and positioning it on the inlet or outlet side of the slide; S3, connecting the roller changing trolley to the bending roller hydraulic cylinder replacing device, and pushing the bending roller hydraulic cylinder replacing device to the position where the bending roller hydraulic cylinder that needs to be replaced is located; S4, by adjusting the position of the slide and the lifting frame assembly, the orientation of the adapter plate assembly is adjusted until the process hole of the adapter plate assembly is aligned with the preset hole on the bending roller hydraulic cylinder to be removed, and then the position of the slide and the lifting frame assembly is locked, thereby ensuring that the position of the adapter plate assembly is locked; S5, move the pulley toward the inlet or outlet side of the slide, so that the adapter plate assembly slowly approaches the bending roller hydraulic cylinder to be removed until the two are in contact, and fasten the adapter plate assembly to the bending roller hydraulic cylinder by removing the screws. Then, remove the connecting screws between the bending roller hydraulic cylinder and the rolling mill arch from the process holes reserved on the adapter plate assembly; S6, slightly lift the lifting frame assembly, and then move the pulley to the exit side or entrance side of the slide to separate the bending roller hydraulic cylinder from the rolling mill arch; S7, then pull the roll changing trolley to drive the bending roll hydraulic cylinder changing device and the bending roll hydraulic cylinder to move accordingly, and pull it out of the rolling mill arch, and disconnect the connection between the bending roll hydraulic cylinder changing device and the bending roll hydraulic cylinder by hoisting on the roll changing track.

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