A method for track change of a rolling mill servo cylinder in a metal rolling plant

Abstract

The present application relates to the technical field of metal rolling equipment maintenance, in particular to a track type replacement method for a rolling mill servo oil cylinder in a metal rolling equipment, which adopts a replacement device to perform the following steps: hoisting the replacement device to a rolling mill roll changing track, making the walking wheels cooperate with the roll changing track, and connecting the power supply and hydraulic pipeline of the hydraulic drive unit; controlling the piston rod of the jacking oil cylinder to extend, making the hoisting rod member descend to a low position, inserting the anti-unhooking pin shaft into the pin hole of the hoisting rod member and locking the anti-unhooking, then hanging the to-be-replaced pressing servo oil cylinder on both ends of the hoisting rod member through the steel wire rope and buckle, or removing the steel wire rope and anti-unhooking pin shaft to release the hanging; controlling the piston rod of the jacking oil cylinder to retract, making the hoisting rod member and the pressing servo oil cylinder ascend to a safe height. The track type replacement device is used to transfer the pressing servo oil cylinder along the rolling mill roll changing track, realizing the mechanized operation of the installation and dismounting of the pressing servo oil cylinder, which is simple to operate and reduces the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of metal rolling equipment maintenance technology, specifically to a rail-type replacement method for rolling mill servo cylinders in metal rolling equipment. Background Technology

[0002] The press-fit servo cylinder is the core actuator of the hydraulic automatic thickness control (AGC) system in modern precision rolling equipment such as strip mills. Its performance directly determines the overall thickness accuracy of the strip. The press-fit servo cylinder is typically installed at the bottom of the mill stand window, with its bottom bearing surface in close contact with the machined surface at the bottom of the stand window. During production, if the press-fit servo cylinder experiences internal leakage or requires seal replacement, the cylinder must be disassembled and removed from the mill stand for repair or replacement.

[0003] Currently, existing press-fit servo cylinder disassembly devices can only easily disassemble the press-fit servo cylinder on the operating side. When the press-fit servo cylinder on the transmission side needs to be disassembled, the operating side cylinder must be disassembled first, then the transmission side cylinder, and finally the operating side cylinder must be reinstalled. The entire process is time-consuming, labor-intensive, and inefficient. Therefore, there is an urgent need to invent a method for efficiently and conveniently disassembling and assembling press-fit servo cylinders, especially a method that allows for the separate disassembly and replacement of the transmission side press-fit servo cylinder without first disassembling the operating side cylinder. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a track-type replacement method for rolling mill servo cylinders in metal rolling equipment. The track-type replacement device is used to transfer the pressing servo cylinder along the rolling mill roll changing track, realizing the mechanized operation of the installation and disassembly of the pressing servo cylinder. The operation is simple, the intensity of manual labor is reduced, and the problems in the background technology can be effectively solved.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a track-type replacement method for a rolling mill servo cylinder in a metal rolling equipment, comprising the following steps performed using a replacement device: The replacement device is hoisted onto the rolling mill roll changing track, so that the traveling wheels mate with the roll changing track, and the power supply and hydraulic lines of the hydraulic drive unit are connected. Extend the piston rod of the lifting cylinder to lower the hoisting rod to the lowest position. Insert the anti-detachment pin into the pin hole of the hoisting rod and lock it to prevent detachment. Then, attach the replacement pressing servo cylinder to both ends of the hoisting rod using wire rope and buckle, or remove the wire rope and anti-detachment pin to release the attachment. The piston rod of the lifting cylinder is retracted to raise the hoisting rod and the pressing servo cylinder to a safe height, or to raise the hoisting rod to disengage from the pressing servo cylinder. The support frame is pushed along the roll changing track of the rolling mill, and the press servo cylinder is transferred between the lower stop surface of the rolling mill stand and the outer side of the stand; Control the lifting cylinder to lower the pressing servo cylinder to the lower stop surface of the archway to complete the installation, or lower it to the ground to complete the disassembly.

[0006] Furthermore, during installation, the pressing servo cylinder is attached to both ends of the hoisting rod on the outside of the archway. After the lifting cylinder is retracted and raised to a safe height, the support frame is pushed to the top of the lower stop surface of the archway. Then, the lifting cylinder is extended and lowered to the lower stop surface of the archway. After manual fine-tuning and installation, the wire rope, buckle, and anti-detachment pin are removed.

[0007] Furthermore, during disassembly, the support frame is pushed above the pressing servo cylinder to be disassembled, the lifting cylinder is extended to lower the hoisting rod, the pressing servo cylinder is attached to the anti-detachment pin that has been inserted and locked on the hoisting rod by a wire rope, the lifting cylinder is retracted to disengage the pressing servo cylinder from the archway stop surface, the support frame is pulled out to the outside of the archway, and the lifting cylinder is retracted to lower the pressing servo cylinder to the ground.

[0008] Furthermore, when attaching the servo cylinder, first insert the anti-detachment pin into the pin hole at the end of the hoisting rod and lock it in place. Then, use wire rope and buckles to attach the servo cylinder to the outside of the small end of the anti-detachment pin at both ends of the hoisting rod.

[0009] Furthermore, the safety height is the height of the bottom surface of the pressing servo cylinder above the locating surface of the mill stand; when pushing the support frame, the center line of the support frame is aligned with the center line of the lower locating surface of the mill stand.

[0010] Furthermore, the replacement device includes a support frame, with a traveling wheel rotatably mounted on the bottom side surface of the support frame, and a cylinder support fixedly mounted on the upper surface of the support frame. A lifting cylinder is vertically mounted on the cylinder support, and the piston rod of the lifting cylinder passes through a corresponding through hole on the cylinder support and is connected to the lifting rod.

[0011] Furthermore, a screw hole is provided in the middle of the upper surface of the hoisting rod, and the piston rod of the lifting cylinder is threadedly connected to the screw hole. Two pin holes are symmetrically provided on the two end side surfaces of the hoisting rod. The axis of the pin hole is perpendicular to the axis of the screw hole. The anti-detachment pin is connected to the hoisting rod through the pin hole.

[0012] Furthermore, the anti-detachment pin is a stepped shaft with a handle on the large end face, a pin hole for inserting into the small end face, and an anti-detachment hole at the small end tail, into which a small pin is inserted.

[0013] Furthermore, the maximum outline dimension of the support frame is smaller than the size of the rolling mill roll changing track window, and the internal space dimension of the support frame is not smaller than the maximum outline dimension of the pressing servo cylinder.

[0014] Furthermore, the support frame is also equipped with a hydraulic drive unit, which includes a hydraulic pump station, an oil tank, a motor, a control valve group, and connecting pipelines.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The method of the present invention utilizes a track-type changing device to transfer the pressing servo cylinder along the rolling mill roll changing track, thereby realizing the mechanized operation of installing and disassembling the pressing servo cylinder, which is simple to operate and reduces the intensity of manual labor.

[0016] 2. The maximum outline dimension of the support frame of the present invention is smaller than the size of the rolling mill roll changing track window, and the internal space dimension is not smaller than the maximum outline dimension of the pressing servo cylinder. Moreover, the center line of the support frame is consistent with the center line of the lower stop of the archway, ensuring that the replacement device can freely enter and exit the inner window of the rolling mill archway and be accurately aligned, thereby improving the disassembly and assembly efficiency and safety.

[0017] 3. The method of the present invention enables the separate disassembly of the servo cylinder on the transmission side without first removing the cylinder on the operating side, thus shortening maintenance time and reducing enterprise production and maintenance costs.

[0018] 4. The design of the traveling wheel and the roller changing track, as well as the anti-detachment structure of the anti-detachment pin shaft, ensure the stability and safety of the changing device during operation, and avoid the risk of wheel derailment and cylinder slippage during hoisting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the support frame of the present invention; Figure 3 This is a schematic diagram of the lifting rod of the present invention; Figure 4 This is a schematic diagram of the anti-detachment pin shaft of the present invention.

[0020] In the diagram: 1. Traveling wheel, 2. Support frame, 3. Lifting rod, 4. Cylinder support, 5. Lifting cylinder, 6. Hydraulic drive unit, 7. Anti-detachment pin. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-4 The present invention provides a technical solution: a track-type replacement method for a rolling mill servo cylinder in a metal rolling equipment. The replacement device mainly includes a support frame 2, a traveling wheel 1, a lifting cylinder 5, a hoisting rod 3, an anti-detachment pin 7, and a hydraulic drive unit 6.

[0023] Please see Figure 1 and Figure 2 The support frame 2 is a frame structure welded from structural steel, possessing sufficient strength and rigidity to withstand a weight of up to 5 tons without deformation. Rotating wheels 1 are mounted on the bottom side surface of the support frame 2. These wheels are adapted to the rolling mill roll changing track, with the convex edge of the wheels overlapping and having a gap with the inner side of the track, ensuring that the wheels 1 do not detach from the track during the transport and pressing of the support frame 2 onto the servo cylinder. The maximum outline dimension of the support frame 2 is smaller than the window size of the rolling mill roll changing track, ensuring that the support frame 2 and the wheels 1 can freely enter and exit the inner window of the rolling mill archway. The internal space dimensions of the support frame 2 are not less than the maximum outline dimension of the pressing servo cylinder. This ensures that after the piston rod of the lifting cylinder 5 is fully retracted, the upper edge of the hoisting rod 3 does not touch the upper internal edge of the support frame 2, and the maximum outline dimension of the pressing servo cylinder does not touch the internal outline of the support frame 2. Furthermore, the bottom surface of the servo cylinder is higher than the upper surface of the operating side servo cylinder, ensuring that when the operating side pressing servo cylinder is in place, the replacement device's transport transmission side pressing servo cylinder can smoothly enter and exit. The centerline of the support frame 2 is aligned with the centerline of the lower stop of the rolling mill stand to ensure alignment accuracy during subsequent installation.

[0024] A cylinder support 4 is fixedly installed on the upper surface of the support frame 2. The cylinder support 4 has a through hole for the piston rod of the lifting cylinder 5 to pass through. The lifting cylinder 5 is vertically installed on the cylinder support 4, with its piston rod passing downward through the through hole.

[0025] Please see Figure 3 The hoisting rod 3 is a long, rod-shaped structure with a threaded hole in the middle of its upper surface. This threaded hole mates with the external thread on the piston rod head at the bottom of the lifting cylinder 5, forming a threaded connection between the hoisting rod 3 and the piston rod of the lifting cylinder 5. Two pin holes are symmetrically located on the side surfaces at both ends of the hoisting rod 3. The axes of the two pin holes are perpendicular to the axis of the central threaded hole, and the two pin holes are symmetrically distributed about the center of the threaded hole.

[0026] Please see Figure 4 The anti-detachment pin 7 is a stepped shaft with a handle on its large end face for easy gripping and insertion / removal by the operator. The small end face of the anti-detachment pin 7 is used to insert into the pin hole of the lifting rod 3, and an anti-detachment hole is provided at the tail of the small end. In this embodiment, a small pin is inserted into the anti-detachment hole to prevent the anti-detachment pin 7 from slipping out of the pin hole of the lifting rod 3 under stress.

[0027] The support frame 2 is also equipped with a hydraulic drive unit 6, which is connected to the lifting cylinder 5 via hydraulic lines to control the lifting and lowering movement of the piston rod of the lifting cylinder 5. The hydraulic drive unit 6 includes a hydraulic pump station, oil tank, motor, control valve group, and connecting pipelines, and can be a standard model such as a DBD type electric hydraulic pump station or a SYB type manual hydraulic pump station. The lifting cylinder 5 can be a standard engineering hydraulic cylinder such as the HSG series. Both the hydraulic drive unit 6 and the lifting cylinder 5 are existing technologies.

[0028] The method of the present invention specifically includes the installation process and the disassembly process of the press-on servo cylinder, which are described below.

[0029] The installation process of the press-on servo cylinder includes the following steps: The replacement device used in this invention is lifted by a crane onto the roll changing track of the rolling mill, so that the traveling wheel 1 is properly engaged with the roll changing track, and the power supply and hydraulic lines of the hydraulic drive unit 6 are connected. The pressing servo cylinder to be installed is placed in advance beside the roll changing track.

[0030] Extend the piston rod of the lifting cylinder 5 to lower the hoisting rod 3 to its lowest position. Insert the anti-detachment pin 7 into the pin hole at the end of the hoisting rod 3 and lock it in place. Then, use wire ropes and clips to attach the pressing servo cylinder to be installed to the outside of the small end of the anti-detachment pin 7 at both ends of the hoisting rod 3, so that the pressing servo cylinder is stably suspended below the hoisting rod 3. At this time, ensure that the bottom surface of the pressing servo cylinder can safely pass through the archway stop during subsequent movement.

[0031] The piston rod of the lifting cylinder 5 is retracted, causing the hoisting rod 3 and the pressing servo cylinder to rise to a safe height. The safe height is the height at which the bottom surface of the pressing servo cylinder is higher than the archway stop surface, ensuring that the pressing servo cylinder will not interfere with the archway stop or other structures during horizontal movement.

[0032] The support frame 2 is manually pushed along the mill roll changing track until it is directly above the lower stop face of the mill stand. During the pushing process, the centerline of the support frame 2 is aligned with the centerline of the lower stop face of the mill stand. Since the maximum outline dimension of the support frame 2 is smaller than the window size of the mill roll changing track, and the centerline of the support frame 2 is consistent with the centerline of the lower stop face of the mill stand, the support frame 2 can smoothly enter the inside of the mill stand and accurately enter its position.

[0033] Extend the piston rod of the lifting cylinder 5 (i.e., control the movement of the lifting cylinder 5), causing the hoisting rod 3 and the pressing servo cylinder to slowly descend, ensuring the stop surface of the pressing servo cylinder smoothly lands on the lower stop surface of the archway. Manually adjust the pressing servo cylinder to ensure it is properly installed. Finally, remove the wire rope, clips, and anti-detachment pin 7, and move the replacement device out, completing the installation.

[0034] II. The disassembly process of the press-on servo cylinder is the reverse of the installation process described above, and includes the following steps: The replacement device used in this invention is pushed along the mill roll changing track to below the pressing servo cylinder to be disassembled, so that the support frame 2 is located directly below the pressing servo cylinder to be disassembled.

[0035] Extend the piston rod of the lifting cylinder 5 to lower the hoisting rod 3. Insert the anti-detachment pin 7 into the pin hole at the end of the hoisting rod 3 and lock it in place. Then, use wire rope and buckles to attach the pressing servo cylinder to be disassembled to the outside of the small end of the anti-detachment pin 7 at the through grooves at both ends of the hoisting rod 3.

[0036] The piston rod of the lifting cylinder 5 is retracted, causing the hoisting rod 3 to rise, which in turn drives the pressing servo cylinder to disengage from the archway stop surface.

[0037] Pull the support frame 2 out to the outside of the archway along the rolling mill roll changing track.

[0038] Extend the piston rod of the lifting cylinder 5 to lower the hoisting rod 3 and the pressing servo cylinder to the ground, remove the wire rope, buckle and anti-detachment pin 7 to complete the disassembly.

[0039] Since the internal space of the support frame 2 is not less than the maximum outline size of the pressing servo cylinder, and the piston rod of the lifting cylinder 5 can extend to the bottom to lower the hoisting rod 3 to a sufficiently low position, both the operating side and the transmission side of the pressing servo cylinder can be smoothly attached and removed, realizing the separate disassembly of the transmission side pressing servo cylinder without first removing the operating side cylinder.

[0040] The specific connection methods mentioned in this application, such as fixed connections or settings, include but are not limited to conventional connection methods such as integral molding, welding, bolt connection, riveting, and adhesive bonding.

[0041] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for track-type replacement of servo cylinders in metal rolling equipment, characterized in that, The following steps are performed using a replacement device: The replacement device is hoisted onto the rolling mill roll changing track, so that the traveling wheel (1) is engaged with the roll changing track, and the power supply and hydraulic pipeline of the hydraulic drive unit (6) are connected. Extend the piston rod of the lifting cylinder (5) to lower the hoisting rod (3) to a low position. Insert the anti-detachment pin (7) into the pin hole of the hoisting rod (3) and lock it to prevent detachment. Then, attach the replacement pressing servo cylinder to both ends of the hoisting rod (3) with wire rope and buckle, or remove the wire rope and anti-detachment pin (7) to release the attachment. The piston rod of the lifting cylinder (5) is retracted to raise the hoisting rod (3) and the pressing servo cylinder to a safe height, or to raise the hoisting rod (3) to disengage from the pressing servo cylinder. Push the support frame (2) along the rolling mill roll changing track and move the press servo cylinder between the lower stop surface of the rolling mill stand and the outside of the stand; Control the lifting cylinder (5) to lower the pressing servo cylinder to the lower stop surface of the archway to complete the installation, or lower it to the ground to complete the disassembly.

2. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 1, characterized in that: During installation, the pressing servo cylinder is attached to both ends of the hoisting rod (3) on the outside of the archway. After the lifting cylinder (5) is retracted and raised to a safe height, the supporting frame (2) is pushed to the top of the lower stop surface of the archway. Then, the lifting cylinder (5) is extended and lowered to the lower stop surface of the archway. After manual fine-tuning and installation, the wire rope, buckle and anti-detachment pin (7) are removed.

3. The method for track-type replacement of servo cylinders in metal rolling equipment according to claim 1, characterized in that: During disassembly, push the support frame (2) above the pressing servo cylinder to be disassembled, control the lifting cylinder (5) to extend so that the hoisting rod (3) is lowered, and hang the pressing servo cylinder on the anti-detachment pin (7) that has been inserted and locked on the hoisting rod (3) by steel wire rope. Then control the lifting cylinder (5) to retract so that the pressing servo cylinder is removed from the archway stop surface. After pulling the support frame (2) out to the outside of the archway, control the lifting cylinder (5) to retract so that the pressing servo cylinder is lowered to the ground.

4. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 1, characterized in that: When attaching the press-up servo cylinder, first insert the anti-detachment pin (7) into the pin hole at the end of the hoisting rod (3) and lock it to prevent detachment. Then, use wire rope and buckle to attach the press-up servo cylinder to the outside of the small end of the anti-detachment pin (7) at the through groove at both ends of the hoisting rod (3).

5. The rail-type replacement method for the servo cylinder of a rolling mill in a metal rolling equipment according to claim 1, characterized in that: The safety height is the height of the bottom surface of the press-up servo cylinder above the locating surface of the mill stand; when pushing the support frame (2), the center line of the support frame (2) is aligned with the center line of the lower locating surface of the mill stand.

6. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 1, characterized in that: The replacement device includes a support frame (2), a traveling wheel (1) is rotatably provided on the bottom side surface of the support frame (2), a cylinder support (4) is fixedly provided on the upper surface of the support frame (2), a lifting cylinder (5) is vertically installed on the cylinder support (4), and the piston rod of the lifting cylinder (5) passes through the corresponding through hole on the cylinder support (4) and is connected to the hoisting rod (3).

7. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 6, characterized in that: The hoisting rod (3) has a screw hole in the middle of its upper surface. The piston rod of the lifting cylinder (5) is threaded to the screw hole. Two pin holes are symmetrically opened on the two side surfaces of the hoisting rod (3). The axis of the pin hole is perpendicular to the axis of the screw hole. The anti-detachment pin (7) is connected to the hoisting rod (3) through the pin hole.

8. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 7, characterized in that: The anti-detachment pin (7) is a stepped shaft with a handle on the large end face and a pin hole on the small end face. The small end tail is provided with an anti-detachment hole, and a small pin is inserted into the anti-detachment hole.

9. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 6, characterized in that: The maximum outline dimension of the support frame (2) is smaller than the size of the rolling mill roll changing track window, and the internal space dimension of the support frame (2) is not smaller than the maximum outline dimension of the pressing servo cylinder.

10. The method for track-type replacement of rolling mill servo cylinders in metal rolling equipment according to claim 6, characterized in that: The support frame (2) is also equipped with a hydraulic drive unit (6), which includes a hydraulic pump station, an oil tank, a motor, a control valve group and connecting pipelines.

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