Tool and method for disassembling and assembling cross balance cylinder of back-up roll of hot rolling PC rolling mill

Abstract

The invention discloses a hot rolling PC rolling mill supporting roller cross balance cylinder disassembling and assembling tool and method. The tool comprises a press-fitting plate, an upper connecting plate, a lower connecting plate and a balance weight disc. A front round groove and a back round groove are formed in the two faces of the press-fitting plate, a left positioning face and a right positioning face are arranged on the two sides of the back round groove, and a balance weight screw hole and a positioning through hole are formed in the bottom face of the front round groove. Notches are formed in the top face and the bottom face of the press-fitting plate, and the upper connecting plate and the lower connecting plate are arranged in the notches correspondingly. Jacking screw holes are formed in the two sides of the press-fitting plate, and guide through holes are formed in the inner sides of the jacking screw holes. The counterweight disc is arranged in the counterweight screw hole through a screw, and the screw is screwed with an adjusting nut on the outer side of the counterweight disc. According to the method, the cross balance cylinder is arranged in the circular groove in the back face of the press-fitting plate in a sleeving mode for positioning, and the cross balance cylinder is moved out of a rolling mill housing by screwing jacking bolts into the jacking screw holes; and the cross balance cylinder is pressed into a rolling mill housing by screwing a nut into the guide screw, so that the disassembly and assembly operation is realized. According to the tool and method, the disassembly and assembly efficiency is improved, and damage to the cross balance cylinder in the disassembly and assembly process is avoided.

Description

Technical Field

[0001] This invention relates to the field of electromechanical equipment installation technology, and in particular to a tooling and method for disassembling and assembling a cross balance cylinder for a hot-rolled PC mill support roll. Background Technology

[0002] The PC (Paircross) mill for hot-rolled strip is called a paired roll cross mill. There is one pair of upper and lower work rolls and one pair of support rolls. The axes of the work rolls and support rolls are kept parallel. The upper and lower pairs of rolls can cross at a very small angle, which is used for online dynamic control of strip crown.

[0003] The cross balance cylinder of the support roll plays an important role in hot rolling PC mills. The cross balance cylinder is installed on the gate on the entrance side of the mill. Its function is to adjust the cross angle of the rolls to control the crown of the strip when the rolling process requires dynamic adjustment. When the work roll is offset relative to the support roll towards the exit side, the roll bearing seat is always pressed against the cross mechanism of the mill on the exit side by the cross balance cylinder to maintain the stability of the rolling state.

[0004] When hot-rolled strip mills dynamically adjust the strip crown and control the roll cross angle, the piston and grease plunger of the cross balance cylinder move frequently. Wear of the piston and cylinder rod and failure of the seal can lead to equipment failures such as oil leakage, oil cross-flow, and copper hinge breakage. In such cases, emergency repairs are required immediately.

[0005] like Figure 1 and Figure 2 As shown, the top and bottom surfaces of the cross balance cylinder 1 end face are respectively provided with a rod-side flange connection surface 11 and a rodless-side flange connection surface 12, and the sides are respectively provided with a left positioning surface 13 and a right positioning surface 14. Furthermore, the upper right and lower left sides of the end face are respectively provided with an upper lifting lug screw hole 15 and a lower lifting lug screw hole 16. The cross balance cylinder 1 is embedded in the rolling mill stand 2 and positioned within the rolling mill stand 2 by the left positioning surface 13 and the right positioning surface 14. The two sides of the end face of the cross balance cylinder 1 are fixed to the rolling mill stand 2 by positioning pressure plates 21 and mounting bolts 22. The piston of the cross balance cylinder is connected to the roll bearing seat. The extension or retraction of the piston allows the roll to rotate horizontally and change within a 15-degree angle to the rolling line, achieving the effect of cross rolling.

[0006] The traditional method for disassembling the cross balance cylinder involves using a lifting lug to attach the cross balance cylinder and then using a hand-operated hoist to hold it in place. Because the cross balance cylinder is embedded in the archway and has no process holes on the back, it can only be slowly pried out with a pry bar, which is not only time-consuming and laborious but also prone to damaging the cross balance cylinder. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a tooling and method for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill. The tooling and method overcome the defects of traditional cross balance cylinder disassembly operations. The tooling is easy to process and manufacture, has low cost, wide applicability, and convenient disassembly and assembly operations, thereby improving the efficiency of disassembly and assembly operations and avoiding damage to the cross balance cylinder during the disassembly and assembly process.

[0008] To solve the above-mentioned technical problems, the present invention provides a tooling for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill, comprising a pressure plate, an upper connecting plate, a lower connecting plate, and a counterweight disc; The pressing plate has a circular groove centered on the front and back sides, with the diameter of the circular groove on the back being larger than that of the circular groove on the front. A left positioning surface and a right positioning surface are located on either side of the circular groove on the back. The bottom surface of the circular groove on the front has counterweight screw holes spaced vertically at the center, and positioning through holes are located at the upper left and lower right. The top and bottom surfaces of the pressing plate each have a centrally located slot. The upper and lower connecting plates are bolted to the slots on the top and bottom surfaces of the pressing plate. The pressing plate has symmetrically spaced lifting screw holes on both sides from top to bottom, with guide through holes spaced apart inside the lifting screw holes. The counterweight disc has through holes spaced symmetrically along the radial direction, and a screw is inserted into the screw hole of the counterweight. An adjusting nut is screwed onto the outside of the counterweight disc.

[0009] Furthermore, the circular groove on the back of the press plate protrudes from the back of the press plate to form a stepped structure.

[0010] Furthermore, the top surface of the press plate is symmetrically provided with lifting lugs on both sides of the groove.

[0011] A method for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill based on the above-mentioned disassembly and assembly tooling includes the following steps: Step 1: When disassembling the cross balance cylinder, remove the flanges of the rod chamber and rodless chamber of the cross balance cylinder, as well as the dry oil pipe, and remove the positioning pressure plates on both sides of the end face of the cross balance cylinder. Step 2: From the outside in, fit the press plate into the cross balance cylinder. The circular groove on the back fits onto the outer cylindrical surface of the end face of the cross balance cylinder. The left and right positioning surfaces on both sides of the circular groove on the back contact the left and right positioning surfaces of the cross balance cylinder, respectively, to lock the cross balance cylinder and prevent it from rotating. Step 3: Use pre-positioning bolts to pass through the upper left and lower right positioning through holes of the press plate and screw them into the upper and lower lifting lug holes of the cross balance cylinder to achieve the positioning connection between the cross balance cylinder and the press plate. Step 4: Use guide screws to pass through the guide through holes on both sides of the press plate and screw them into the positioning pressure plate mounting screw holes of the rolling mill stand. The guide screws play a guiding role in the movement of the press plate, preventing the cross balance cylinder from tilting or falling due to gravity during disassembly. Step 5: Connect the upper connecting plate and the lower connecting plate to the rod-side flange connection surface and the rodless-side flange connection surface of the cross balance cylinder with bolts. The upper connecting plate and the lower connecting plate connect the press plate and the cross balance cylinder into a whole, which serves as a force-bearing element. Step 6: Screw the lifting bolts into the lifting screw holes on both sides of the pressure plate and press them against the mill stand. Pre-level the pressure plate and symmetrically screw in the lifting bolts on both sides of the pressure plate until the cross balance cylinder is gradually removed from the mill stand. Step 7: Use a hand-operated hoist to connect the pressing plate, remove the cross balance cylinder, and complete the disassembly operation; Step 8: When installing the cross balance cylinder, perform steps 2, 3, 4 and 5 in sequence; Step 9: Install the counterweight disc onto the outside of the circular groove on the front of the press plate using screws. Use the counterweight screw holes arranged above and below and the adjusting nut to make the axis of the cross balance cylinder perpendicular to the mill stand. Step 10: Screw nuts into the guide screws on both sides of the press plate and tighten them symmetrically to gradually press the cross balance cylinder into the mounting hole of the rolling mill stand. After the cross balance cylinder is in place, install the positioning pressure plate, rod chamber and rodless chamber flanges and dry oil pipe on both sides of the end face to complete the installation of the cross balance cylinder.

[0012] Furthermore, in step seven, the lifting lugs on the top surface of the pressure plate connected to the hand chain hoist remove the cross balance cylinder.

[0013] The present invention, a fixture and method for disassembling and assembling the cross balance cylinder of the hot-rolled PC mill support roll, adopts the above-mentioned technical solution. Specifically, the fixture includes a pressure plate, upper and lower connecting plates, and a counterweight disc. The pressure plate has a front circular groove and a back circular groove on both sides. The back circular groove has left and right positioning surfaces on both sides. The bottom surface of the front circular groove has a counterweight screw hole and a positioning through hole. The top and bottom surfaces of the pressure plate have slots, and the upper and lower connecting plates are respectively located in the slots. The pressure plate has lifting screw holes on both sides, and guide through holes are provided inside the lifting screw holes. The counterweight disc is located in the counterweight screw hole via a screw rod, and an adjusting nut is screwed onto the outside of the counterweight disc. This method involves fitting the back circular groove of the pressure plate into the cross balance cylinder for positioning, screwing in a lifting bolt through the lifting screw hole to move the cross balance cylinder out of the mill stand, and then pressing the cross balance cylinder back into the mill stand by screwing a nut onto the guide screw rod, thus achieving the disassembly and assembly operation. This tooling and method overcomes the shortcomings of traditional cross balance cylinder disassembly operations. The tooling is easy to process and manufacture, has low cost, wide applicability, and is convenient to disassemble and assemble, improving the efficiency of disassembly and assembly operations and avoiding damage to the cross balance cylinder during the disassembly and assembly process. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the end face of the cross balance cylinder; Figure 2 This is a schematic diagram showing the installation location of the cross balance cylinder; Figure 3 This is a schematic diagram of the disassembly and assembly tooling structure of the cross balance cylinder for the support rolls of the hot-rolled PC mill of the present invention; Figure 4 This is a schematic diagram of the front of the pressure plate in this disassembly and assembly tooling; Figure 5 This is a schematic diagram of the back of the pressure plate in this disassembly and assembly tooling; Figure 6 This is a schematic diagram of the pressure plate and upper and lower connecting plates in this disassembly and assembly tooling; Figure 7 This is a schematic diagram of the disassembly of the cross balance cylinder in this method; Figure 8 This is a schematic diagram of the installation of the cross balance cylinder in this method. Detailed Implementation

[0015] Implementation, for example Figures 3 to 6 As shown, the hot-rolled PC mill support roll cross balance cylinder disassembly and assembly tooling of the present invention includes a pressure plate 3, an upper connecting plate 4, a lower connecting plate 5, and a counterweight disc 6; The pressing plate 3 has a circular groove 31 on the front and a circular groove 32 on the back, respectively, with the diameter of the circular groove 32 on the back being larger than that of the circular groove 31 on the front. The circular groove 32 on the back has a left positioning surface 33 and a right positioning surface 34 on both sides. The circular groove 31 on the front has counterweight screw holes 35 spaced vertically at the center on the bottom, and positioning through holes 36 at the upper left and lower right. The pressing plate 3 has slots 37 at the center on the top and bottom surfaces, and the upper connecting plate 4 and the lower connecting plate 5 are respectively bolted to the slots 37 on the top and bottom surfaces of the pressing plate 3. The pressing plate 3 has lifting screw holes 38 symmetrically spaced from top to bottom on both sides, and guide through holes 39 spaced on the inner side of the lifting screw holes 38. The counterweight disc 6 is provided with through holes 61 symmetrically spaced in the radial direction, and a screw 62 is inserted and screwed into the counterweight screw hole 35. An adjusting nut 63 is screwed onto the outside of the counterweight disc 6.

[0016] Preferably, the circular groove 32 on the back of the pressing plate 3 protrudes from the back of the pressing plate 3 to form a stepped structure.

[0017] Preferably, the top surface of the press plate 3 is provided with lifting lugs 30 symmetrically on both sides of the groove 37.

[0018] In this tooling, the front of the pressure plate 3 is machined with a circular groove 31 for storing the counterweight disc 6. The bottom surface of the circular groove 31 is machined with a counterweight screw hole 35 for connecting the counterweight disc 6, and upper left and lower right positioning through holes 36 for connecting the upper lifting lug screw hole 15 and the lower lifting lug screw hole 16 of the cross balance cylinder 1.

[0019] The back of the press plate 3 is machined with a circular groove 32 on the back, which has left and right positioning surfaces 33 and 34 for matching with the outer contour of the end face of the cross balance cylinder 1. When disassembling the cross balance cylinder, the pressure plate 3 is fitted into the cross balance cylinder 1 through the circular groove 32 on the back and fixed by the left and right positioning surfaces 33 and 34 to prevent the cross balance cylinder 1 from rotating and to achieve precise positioning. The upper left and lower right positioning through holes 36 of the pressure plate 3 are used to insert bolts and screw them into the upper lifting lug screw hole 15 and the lower lifting lug screw hole 16 of the cross balance cylinder 1, which serves to position the pressure plate 3 and the cross balance cylinder 1. However, since the diameter of the bolt is too small, it cannot be used as the main stress point for disassembling and assembling the cross balance cylinder.

[0020] The guide through holes 39 of the press plate 3 are used to position the press plate 3 on the mill stand 2. Their number, size and dimensions are consistent with the through holes on the positioning pressure plate 21 of the fixed cross balance cylinder 1. Before disassembly and assembly, the positioning pressure plate 21 is removed, and the guide screw 7 is screwed into the screw hole of the mill stand 2, which serves to guide, support and press the press plate 3 into the cross balance cylinder 1.

[0021] The pressure plate 3 has lifting screw holes 38 on both sides, which are symmetrically distributed. When disassembling the cross balance cylinder 1, the lifting screw holes 38 are screwed into the lifting bolts 8. The lifting bolts 8, which are symmetrically distributed, act on the mill stand 2, causing the pressure plate 3 and the cross balance cylinder 1 to detach together from the mill stand 2.

[0022] The top surface of the press plate 3 is milled to form a slot 37 for mounting the upper connecting plate 4. The slot 37 has screw holes for mounting the upper connecting plate 4. The upper connecting plate 4 is used to connect the press plate 3 and the cross balance cylinder 1, serving as a connecting part for fixing the cross balance cylinder 1 and the press plate 3, and also acting as a force-bearing element when disassembling the cross balance cylinder 1.

[0023] The bottom surface of the press plate 3 is milled by a milling machine to form a groove 37 for mounting the lower connecting plate 5. The groove 37 is machined with screw holes for mounting the lower connecting plate 5. The lower connecting plate 5 is used to connect the press plate 3 and the cross balance cylinder 1, serving as a connecting part for fixing the cross balance cylinder 1 and the press plate 3, and also acting as a force-bearing element when disassembling the cross balance cylinder 1.

[0024] like Figure 7 and Figure 8 As shown, a method for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill based on the above-mentioned disassembly and assembly tooling includes the following steps: Step 1: When disassembling the cross balance cylinder 1, remove the flanges of the rod chamber and rodless chamber of the cross balance cylinder 1, as well as the dry oil pipe, and remove the positioning pressure plates on both sides of the end face of the cross balance cylinder 1. Step 2: From the outside in, insert the press plate 3 into the cross balance cylinder 1. The circular groove 32 on the back is fitted onto the outer cylindrical surface of the end face of the cross balance cylinder 1. The left positioning surface 33 and the right positioning surface 34 on both sides of the circular groove 32 on the back contact the left positioning surface and the right positioning surface of the cross balance cylinder 1 respectively, locking the cross balance cylinder 1 to prevent rotation. Step 3: Use pre-positioning bolts 9 to pass through the upper left and lower right positioning through holes 36 of the press plate 3 and screw them into the upper and lower lifting lug holes of the cross balance cylinder 1 to achieve the positioning connection between the cross balance cylinder 1 and the press plate 3. Step 4: Pass the guide screw 7 through the guide through holes 39 on both sides of the pressure plate 3 and screw it into the positioning pressure plate mounting screw hole of the rolling mill stand 2. The guide screw 7 plays a guiding role in the movement of the pressure plate 3, and prevents the cross balance cylinder 1 from tilting or falling due to gravity during the disassembly process. Step 5: Connect the upper connecting plate 4 and the lower connecting plate 5 to the rod-side flange connection surface and the rodless-side flange connection surface of the cross balance cylinder 1 with bolts. The upper connecting plate 4 and the lower connecting plate 5 connect the press plate 3 and the cross balance cylinder 1 into a whole, which serves as a force-bearing element. Step 6: Screw the lifting bolts 8 into the lifting screw holes 38 on both sides of the pressure plate 3 and press them against the mill stand 2. Pre-level the pressure plate 3 and symmetrically screw in the lifting bolts 8 on both sides of the pressure plate 3 until the cross balance cylinder 1 is gradually disengaged from the mill stand 2. Step 7: Use a hand-operated hoist to connect the pressing plate 3 and remove the cross balance cylinder 1 to complete the disassembly operation; Step 8: When installing the cross balance cylinder 1, perform steps 2, 3, 4 and 5 in sequence; Step 9: Install the counterweight disc 6 on the outside of the circular groove 31 on the front of the pressure plate 3 through the screw 62, and make the axis of the cross balance cylinder 1 perpendicular to the mill stand 2 through the counterweight screw holes 35 arranged above and below and the adjusting nut 63. Step 10: Screw nuts 71 into the guide screws 7 on both sides of the press plate 3 and tighten them symmetrically to gradually press the cross balance cylinder 1 into the mounting hole of the mill stand 2. After the cross balance cylinder 1 is in place, install the positioning pressure plate, rod chamber and rodless chamber flange and dry oil pipe on both sides of the end face to complete the installation of the cross balance cylinder 1.

[0025] Preferably, in step seven, the lifting lug 30 on the top surface of the hand-operated hoist connecting the pressure plate 3 moves the cross balance cylinder out.

[0026] This tooling and method utilizes a pressure plate and upper and lower connecting plates to withstand the tensile force during the disassembly and assembly of the cross balance cylinder, avoiding the defect of the original cross balance cylinder's upper and lower lifting lug bolt holes being roughened and damaged. During disassembly and assembly, the upper and lower connecting plates are subjected to force simultaneously, meaning that only two lifting lug bolt holes or jacks are needed to prevent the cross balance cylinder from tilting and getting stuck in the rolling mill stand's mounting hole. During installation, a counterweight disc is used to adjust the level, ensuring that the cross balance cylinder is perpendicular to the rolling mill stand during installation, avoiding the uncertainty of manual adjustment.

[0027] This tooling is easy to manufacture, inexpensive, and widely applicable. This method is particularly suitable for the disassembly and assembly of the cross balance cylinder of the support roller, and can also be used for the disassembly and assembly of the cross balance cylinder of the work roller, effectively improving the efficiency of disassembly and assembly.

Claims

1. A tooling for disassembling and assembling a cross balance cylinder for a hot-rolled PC mill support roll, characterized in that: Includes a press plate, an upper connecting plate, a lower connecting plate, and a counterweight disc; The pressing plate has a circular groove centered on the front and back sides, with the diameter of the circular groove on the back being larger than that of the circular groove on the front. A left positioning surface and a right positioning surface are located on either side of the circular groove on the back. The bottom surface of the circular groove on the front has counterweight screw holes spaced vertically at the center, and positioning through holes are located at the upper left and lower right. The top and bottom surfaces of the pressing plate each have a centrally located slot. The upper and lower connecting plates are bolted to the slots on the top and bottom surfaces of the pressing plate. The pressing plate has symmetrically spaced lifting screw holes on both sides from top to bottom, with guide through holes spaced apart inside the lifting screw holes. The counterweight disc has through holes spaced symmetrically along the radial direction, and a screw is inserted into the screw hole of the counterweight. An adjusting nut is screwed onto the outside of the counterweight disc.

2. The tooling for disassembling and assembling the cross balance cylinder of the hot-rolled PC mill support rolls according to claim 1, characterized in that: The circular groove on the back of the press plate protrudes from the back of the press plate to form a stepped structure.

3. The tooling for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill according to claim 1 or 2, characterized in that: The top surface of the press plate is symmetrically provided with lifting lugs on both sides of the groove.

4. A method for disassembling and assembling the cross balance cylinder of the support roll of a hot-rolled PC mill based on the disassembly and assembly tooling described in any one of claims 1 to 3, characterized in that... Includes the following steps: Step 1: When disassembling the cross balance cylinder, remove the flanges of the rod chamber and rodless chamber of the cross balance cylinder, as well as the dry oil pipe, and remove the positioning pressure plates on both sides of the end face of the cross balance cylinder. Step 2: From the outside in, fit the press plate into the cross balance cylinder. The circular groove on the back fits onto the outer cylindrical surface of the end face of the cross balance cylinder. The left and right positioning surfaces on both sides of the circular groove on the back contact the left and right positioning surfaces of the cross balance cylinder, respectively, to lock the cross balance cylinder and prevent it from rotating. Step 3: Use pre-positioning bolts to pass through the upper left and lower right positioning through holes of the press plate and screw them into the upper and lower lifting lug holes of the cross balance cylinder to achieve the positioning connection between the cross balance cylinder and the press plate. Step 4: Use guide screws to pass through the guide through holes on both sides of the press plate and screw them into the positioning pressure plate mounting screw holes of the rolling mill stand. The guide screws play a guiding role in the movement of the press plate, preventing the cross balance cylinder from tilting or falling due to gravity during disassembly. Step 5: Connect the upper connecting plate and the lower connecting plate to the rod-side flange connection surface and the rodless-side flange connection surface of the cross balance cylinder with bolts. The upper connecting plate and the lower connecting plate connect the press plate and the cross balance cylinder into a whole, which serves as a force-bearing element. Step 6: Screw the lifting bolts into the lifting screw holes on both sides of the pressure plate and press them against the mill stand. Pre-level the pressure plate and symmetrically screw in the lifting bolts on both sides of the pressure plate until the cross balance cylinder is gradually removed from the mill stand. Step 7: Use a hand-operated hoist to connect the pressing plate, remove the cross balance cylinder, and complete the disassembly operation; Step 8: When installing the cross balance cylinder, perform steps 2, 3, 4 and 5 in sequence; Step 9: Install the counterweight disc onto the outside of the circular groove on the front of the press plate using screws. Use the counterweight screw holes arranged above and below and the adjusting nut to make the axis of the cross balance cylinder perpendicular to the mill stand. Step 10: Screw nuts into the guide screws on both sides of the press plate and tighten them symmetrically to gradually press the cross balance cylinder into the mounting hole of the rolling mill stand. After the cross balance cylinder is in place, install the positioning pressure plate, rod chamber and rodless chamber flanges and dry oil pipe on both sides of the end face to complete the installation of the cross balance cylinder.

5. The method for disassembling and assembling the cross balance cylinder of the support roll in a hot-rolled PC mill according to claim 4, characterized in that: In step seven, the hand-operated hoist connects to the lifting lug on the top surface of the pressing plate to move the cross balance cylinder out.

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