A replacement device for a hydraulic jacking cylinder and its installation and disassembly method.

Abstract

A replacement device for a hydraulic jacking cylinder includes: a main frame; a traction cylinder disposed on the upper part of the main frame; a traction part, one end of which is connected to the free end of the piston rod of the traction cylinder, and the other end of which is provided with a clamping part for clamping the hydraulic jacking cylinder; and a tilting device for adjusting the posture of the hydraulic jacking cylinder clamped by the clamping part. The tilting device includes a tilting cylinder disposed on the main frame and a tilting part connected to the free end of the piston rod of the tilting cylinder. The tilting part is located below the clamping part, and the piston rod of the tilting cylinder can move in the vertical direction. This replacement device uses a tilting device to reduce the height of the hydraulic jacking cylinder during transportation within the main frame of the leveling machine. By using a movable pulley, a lifting chain, and a fixed pulley disposed on the piston rod of the traction cylinder, the overall length of the replacement device is reduced, thereby enabling the transportation of the hydraulic jacking cylinder within the main frame of the leveling machine using only this replacement device.

Description

Technical Field

[0001] This invention relates to the field of cold rolling of steel, and in particular to a hydraulic top cylinder replacement device for a leveling machine and its installation and disassembly method. Background Technology

[0002] In the cold rolling section of the steel industry, strip steel after recrystallization annealing and galvanizing often requires finishing to give it the necessary properties and surface quality to meet the requirements of subsequent processing. Therefore, hot-dip galvanizing and continuous annealing units in the cold rolling section are generally equipped with leveling machines at the exit section. Leveling is essentially a small-reduction rolling deformation. This device is generally a 4-roll single-stand structure, similar to a small-reduction rolling mill. The hydraulic jacking cylinders are located on both sides at the bottom of the main frame, providing rolling force to the leveling machine, and are a key core piece of equipment. The main body of the hydraulic jacking cylinder is a large-tonnage hydraulic cylinder with a lifting capacity of over 1,000 tons and a weight of over 6 tons. The cylinder body is 1100mm high, and a 600mm stroke measuring rod is located below the cylinder; disassembly and assembly are not permitted on-site. This hydraulic jacking cylinder operates continuously for extended periods and requires periodic replacement.

[0003] Because the hydraulic jacking cylinder is located in a confined space within the main frame, it cannot be directly hoisted using an overhead crane. The original method required suspending multiple chain hoists on the superstructure for auxiliary lifting. However, this method has significant drawbacks: firstly, hoisting the hoists involves working at height and near the edge, which is dangerous, and hoist lifting is labor-intensive and inefficient; secondly, the device has a small clearance with the surrounding structure, and even a slight tilt can easily cause jamming, but with multiple hoists, it is difficult to ensure that the device does not tilt, resulting in repeated adjustments and extremely low efficiency. Furthermore, there is a stroke measuring rod below the cylinder, and its overall height exceeds the height of the operating space within the frame. To remove the cylinder from the frame, it must be rotated at a certain angle to reduce its vertical height, making rotation inconvenient. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a simple-to-operate replacement device for the hydraulic top cylinder of a leveling machine.

[0005] This invention proposes a replacement device for a hydraulic jacking cylinder, comprising: a main frame; a traction cylinder disposed on the upper part of the main frame; a traction part, one end of which is connected to the free end of the piston rod of the traction cylinder, and the other end of which is provided with a clamping part for clamping the hydraulic jacking cylinder; a tilting device for adjusting the posture of the hydraulic jacking cylinder clamped by the clamping part, the tilting device comprising a tilting cylinder disposed on the main frame and a tilting part connected to the free end of the piston rod of the tilting cylinder, the tilting part being located below the clamping part and the piston rod of the tilting cylinder being movable in the vertical direction; and a traveling mechanism located on the lower part of the main frame for driving the main frame to travel.

[0006] Preferably, the traction unit includes a lifting chain, a fixed gear disposed at one end of the main frame, and a moving gear disposed on the piston rod of the traction cylinder; one end of the lifting chain is fixed to the main frame, passes around the moving gear and the fixed gear in sequence, and the other end is connected to the clamping unit.

[0007] Preferably, the clamping part includes a balance hanger and a plurality of lifting chains for connecting the hydraulic jacking cylinder; one side of the balance hanger is connected to the lifting chain, and the lifting chains are evenly distributed on the other side of the balance hanger.

[0008] Preferably, a fine-tuning screw is installed between the balance bracket and each of the lifting chains to adjust the height of the free end of the lifting chain.

[0009] Preferably, the replacement device further includes a movable support frame located below the clamping part, and the support frame is provided with a receiving hole for accommodating the stroke measuring rod below the hydraulic jack cylinder through which it passes.

[0010] Preferably, the replacement device further includes a counterweight; the counterweight is located on the main frame and at one end away from the traction unit.

[0011] Preferably, the walking mechanism includes a roller located at the lower end of the main frame and a drive motor for driving the roller to roll.

[0012] Preferably, a fixed pulley is provided on the main frame, and the flipping part is connected to the piston rod of the flipping cylinder through a connecting part, which bypasses the fixed pulley.

[0013] This invention also proposes a method for disassembling a hydraulic jacking cylinder, comprising the following steps:

[0014] S1. Transport the replacement device to the lower track of the leveling machine, start the walking mechanism, and drive the replacement device to walk into the main frame of the leveling machine until the clamping part is directly above the hydraulic top cylinder.

[0015] S2. Operate the traction cylinder, extend the piston rod, fix the clamping part to the hydraulic top cylinder, and disconnect the hydraulic top cylinder from the leveling machine;

[0016] S3. Drive the tilting cylinder, the tilting part pushes the hydraulic top cylinder to tilt, drives the walking mechanism, and the changing device carries the hydraulic top cylinder to move out of the leveling machine frame.

[0017] The present invention also provides a method for installing a hydraulic jacking cylinder, comprising the following steps:

[0018] S1. Transport the replacement device to the lower track of the leveling machine, place the hydraulic top cylinder to be installed on the flipping part, and use the clamping part to fix the hydraulic top cylinder.

[0019] S2. Start the tilting cylinder, drive the tilting part to push the hydraulic top cylinder to tilt until the highest height of the hydraulic top cylinder is lower than the bending roller device;

[0020] S3. Start the walking mechanism to drive the replacement device to the position to be installed on the hydraulic top cylinder.

[0021] As described above, the hydraulic jacking cylinder replacement device of the present invention has the following beneficial effects:

[0022] The hydraulic jacking cylinder replacement device uses a tilting mechanism to reduce the height of the hydraulic jacking cylinder during transportation within the main frame of the leveling machine. By utilizing the movable pulley, lifting chain, and fixed pulley installed on the piston rod of the traction cylinder, the overall length of the replacement device is reduced, and the connection space between the traveling crane and the replacement device is expanded. This allows the hydraulic jacking cylinder to be transported within the main frame of the leveling machine using only this replacement device, avoiding the situation where the replacement device has a small fit clearance with the main frame of the leveling machine, which can easily cause jamming during movement. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the hydraulic top cylinder replacement device of the present invention working inside a leveling machine.

[0024] Figure 2 This is a schematic diagram of a hydraulic jacking cylinder replacement device of the present invention when a hydraulic jacking cylinder is suspended.

[0025] Figure 3 This is a schematic diagram of a hydraulic top cylinder replacement device according to the present invention.

[0026] Figure 4 This is another schematic diagram of a hydraulic top cylinder replacement device according to the present invention.

[0027] Figure 5 This is a schematic diagram of the tilting device in a hydraulic top cylinder replacement device of the present invention.

[0028] Figure 6 This is a partial schematic diagram of the traction cylinder and traction unit in a hydraulic jacking cylinder replacement device of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Main frame; 200. Traction cylinder; 300. Traction unit; 301. Lifting chain; 302. Fixed gear; 303. Moving gear; 310. Clamping unit; 311. Balance hanger; 312. Lifting chain; 313. Fine-tuning screw; 400. Tilting device; 410. Tilting cylinder; 420. Tilting unit; 430. Fixed pulley; 440. Connecting part; 500. Support frame; 510. Receiving hole; 520. Support beam; 600. Counterweight; 700. Drive motor; 710. Roller; 800. Main frame of leveling machine; 810. Lower track; 820. Bending roller device; 830. Hydraulic top cylinder. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0032] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0033] like Figures 1 to 4As shown, in one embodiment of the present invention, a replacement device for a hydraulic top-mounted cylinder is provided, comprising: a main frame 100, a traction cylinder 200, a traction part 300, a tilting device 400, and a traveling mechanism; the traction cylinder 200 is disposed on the upper part of the main frame 100; one end of the traction part 300 is connected to the free end of the piston rod of the traction cylinder 200, and the other end of the traction part 300 is provided with a clamping part 310 for clamping the hydraulic top-mounted cylinder 830; the tilting device 400 is used to adjust the posture of the hydraulic top-mounted cylinder 830 clamped by the clamping part 310, and the tilting device 400 includes a tilting cylinder 410 disposed on the main frame 100 and a tilting part 420 connected to the free end of the piston rod of the tilting cylinder 410, the tilting part 420 being located below the clamping part 310 and the piston rod of the tilting cylinder 410 being movable in the vertical direction; the traveling mechanism is located on the lower part of the main frame 100 and drives the main frame 100 to travel.

[0034] The following explanation uses the disassembly process of the hydraulic jacking cylinder 830 as an example to illustrate the operation of this replacement device. It should be noted that, as... Figure 1 As shown, the hydraulic top cylinder 830 is initially located at the bottom of the main frame 800 of the leveling machine. The lower rail of the leveling machine runs through the entire main frame, and a bending roller device 820 is also installed at approximately the center of the main frame 800. The replacement device for the hydraulic top cylinder is configured to travel along the lower rail 810 and move between the bending roller device 820 and the lower rail 810.

[0035] When disassembling the hydraulic top cylinder 830 using the replacement device for the hydraulic top cylinder of the leveling machine, the original support roller replacement trolley must first be lifted away. After verifying that all functions of the replacement device are normal, the disassembly of the hydraulic top cylinder 830 must begin. Beforehand, the shutdown conditions must be communicated, confirming that the shutdown position and other conditions of the hydraulic top cylinder 830 meet the requirements. Next, a crane is used to lift the special device onto the lower track 810 of the leveling machine. The traveling mechanism is then started, driving the replacement device to the main frame 800 of the leveling machine until the clamping part 310 is directly above the hydraulic top cylinder 830. Then, the traction cylinder 200 is operated, extending the piston rod to fix the clamping part 310 to the hydraulic top cylinder 830, thus disconnecting the hydraulic top cylinder 830 from the leveling machine. Finally, the drive tilting cylinder 410 is activated, the tilting part 420 pushes the hydraulic top cylinder 830 to tilt, drives the traveling mechanism, and the replacement device carries the hydraulic top cylinder 830 out of the leveling machine frame.

[0036] Of course, the replacement device can also be used to install the hydraulic top cylinder 830, including the following steps: S1, transport the replacement device to the lower track 810 of the leveling machine, place the hydraulic top cylinder 830 to be installed on the tilting part 420, and use the clamping part 310 to fix the hydraulic top cylinder 830; S2, start the tilting cylinder 410, drive the tilting part 420 to push the hydraulic top cylinder 830 to tilt until the highest height of the hydraulic top cylinder 830 is lower than the bending roller device 820; S3, start the traveling mechanism, drive the replacement device to travel to the position where the hydraulic top cylinder 830 is to be installed.

[0037] like Figures 2-5 As shown, the hydraulic jacking cylinder 830 can be disassembled or installed using this method, allowing it to smoothly enter and exit the main frame 800 of the leveling machine. A bending roller device 820 directly above the hydraulic jacking cylinder prevents it from being directly lifted into position. To reduce the overall height during lifting, a tilting device 400 is installed. By tilting the cylinder vertically, the vertical height of the cylinder body of the hydraulic jacking cylinder 830 is reduced, allowing the hydraulic jacking cylinder 830 to be smoothly transported out of the main frame 800 of the leveling machine. The tilting device 400 also includes a fixed pulley 430 mounted on the main frame 100. The tilting part 420 and the piston rod of the tilting cylinder 410 are connected by a connecting part 440, which bypasses the fixed pulley 430, thus enabling the tilting cylinder 410 to drive the tilting part 420 to move vertically.

[0038] The traveling mechanism includes rollers 710 located at the lower end of the main frame 100 and a drive motor 700 that drives the rollers 710 to roll. The drive motor 700 drives the rollers 710 to move within the lower track 810 of the main frame.

[0039] like Figure 2 , Figure 3 and Figure 6As shown, the traction unit 300 includes a lifting chain 301, a fixed gear 302 located at one end of the main frame, and a moving gear 303 located on the piston rod of the traction cylinder 200. One end of the lifting chain 301 is fixed to the main frame, passes around the moving gear 303 and the fixed gear 302 in sequence, and the other end is connected to a clamping part 310. Since the lower track 810 of the leveling machine is 6 meters long, with 3 meters located inside the leveling machine, when replacing the hydraulic jacking cylinder 830, the replacement device must completely drive the hydraulic jacking cylinder 830 out of the leveling machine frame with sufficient space to meet the needs of the overhead crane connection. Therefore, the length of the main frame extending along the lower track 810 must be minimized. Since the length of the main frame is determined by the length of the traction cylinder 200, the moving gear 303 is used in conjunction with the lifting chain 301. At this time, the extension or retraction length of the piston rod of the traction cylinder 200 is half the length by which the clamping part 310 of the chain descends or rises. While maintaining the same range of motion of the clamping part 310, the length of the traction cylinder 200 can be shortened, thereby expanding the docking space of the vehicle. The structure of the moving gear 303 is similar to that of the moving pulley, and the structure of the fixed gear 302 is similar to that of the fixed pulley.

[0040] like Figure 3 and Figure 4As shown, the clamping part 310 includes a balance frame 311 and several lifting chains 312 for connecting the hydraulic jacking cylinder 830. One side of the balance frame 311 is connected to the lifting chain 301, and the other side of the balance frame 311 is evenly distributed with lifting chains 312. A fine-tuning screw 313 is installed between the balance frame 311 and each lifting chain 312 to adjust the height of the free end of the lifting chain 312. During the lifting process, the bending roller device 820 will not be removed, so the overall height of the replacement device must be lower than that of the bending roller device 820. The bending roller device 820 is not far from the lower track 810, while the hydraulic jacking cylinder 830 is 1.7 meters high. The hydraulic jacking cylinder 830 always moves up and down within the main frame 800 of the leveling machine, which results in a very limited lifting space for the hydraulic jacking cylinder 830. To this end, a balance hanger 311 is set up to connect the lifting chain 301 and the hydraulic jacking cylinder 830. The distance between the balance hanger 311 and the hydraulic jacking cylinder 830 during lifting is adjusted by the fine-tuning screw 313 to shorten the overall length of the sling. In order to further ensure that the balance hanger 311 and the hydraulic jacking cylinder 830 do not interfere with the main frame 800 of the leveling machine during the lifting process, a form is adopted in which one end of several connecting chains is connected to the hydraulic jacking cylinder 830 and the other end is connected to the balance hanger 311. During lifting, the free ends of several lifting chains 312 are connected to the periphery of the hydraulic jacking cylinder 830 and the other end is connected to the balance hanger 311. Since the balance hanger 311 is already positioned within the gap of the bending roller device 820, its width must be smaller than the gap. However, the width between the lifting lugs of the hydraulic jacking cylinder is greater than the gap. Therefore, the connection between the load-bearing chain and the balance hanger 311 is designed as a hinge, so that the shape formed by the lifting chain 312 during lifting presents a spatial form that is smaller at the top and larger at the bottom, thus adapting to various constraints. Simultaneously, since the height of the free end of each lifting chain 312 can be adjusted using a fine-tuning screw 313, it ensures that the hydraulic jacking cylinder 830 remains balanced during the lifting process. This allows for precise adjustment of the hydraulic jacking cylinder 830's posture during lifting, preventing it from jamming against the leveling machine's main frame 800 during the lifting process.

[0041] like Figure 4 and Figure 5As shown, because the hydraulic jacking cylinder 830 has a stroke measuring rod below it, it cannot be placed directly on the ground. Therefore, the replacement device also includes a movable support frame 500, which is located below the traction unit 300. The support frame 500 is provided with a receiving hole 510 to accommodate the stroke measuring rod below the hydraulic jacking cylinder 830, facilitating the placement of the hydraulic jacking cylinder 830 and enabling direct connection by the crane. An open structure without obstructing beams on the outer side of the main lifting chain is adopted to avoid obstruction of the rigging during crane connection. It should be noted that the bottom of the support frame 500, which supports the hydraulic jacking cylinder 830, is provided with several detachable supporting beams that form the receiving hole 510. These supporting beams support the non-stroke measuring rod area at the bottom of the hydraulic jacking cylinder 830. The size of the receiving hole 510 can be adjusted by removing some of the supporting beams. During lifting, some of the supporting beams can be removed to avoid interference between the stroke measuring rod and the receiving hole 510. However, when the hydraulic jacking cylinder 830 is transported in the main frame 800 of the leveling machine, the supporting beams can be installed as much as possible to confine the stroke measuring rod within the receiving hole 510 and stabilize the transport of the hydraulic jacking cylinder 830 within the main frame 800 of the leveling machine.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A device for replacing a hydraulic jacking cylinder, characterized in that, For replacing hydraulic jacking cylinders with stroke measuring rods; including: Main frame (100); A traction cylinder (200) is disposed on the upper part of the main frame (100); A traction unit (300) is provided, one end of which is connected to the free end of the piston rod of the traction cylinder (200), and the other end of which is provided with a clamping part (310) for clamping the hydraulic top cylinder (830); the traction unit (300) includes a lifting chain (301), a fixed gear (302) provided at one end of the main frame (100), and a moving gear (303) provided on the piston rod of the traction cylinder (200); one end of the lifting chain (301) is fixed to the main frame, passes around the moving gear (303) and the fixed gear (302) in sequence, and the other end is connected to the clamping part (310); A flipping device (400) is used to adjust the posture of the hydraulic top cylinder (830) held by the clamping part (310). The flipping device (400) includes a flipping cylinder (410) disposed on the main frame (100) and a flipping part (420) connected to the free end of the piston rod of the flipping cylinder (410). The flipping part (420) is located below the clamping part (310) and the piston rod of the flipping cylinder (410) can move in the vertical direction. A walking mechanism is located at the lower part of the main frame (100) and drives the main frame (100) to walk; The clamping part (310) includes a balance hanger (311) and a plurality of lifting chains (312) for connecting the hydraulic top cylinder (830); one side of the balance hanger (311) is connected to the lifting chain (301), and the lifting chains (312) are evenly distributed on the other side of the balance hanger (311). A fine-tuning screw (313) is installed between the balance hanger (311) and each of the lifting chains (312) for adjusting the height of the free end of the lifting chain (312); It also includes a movable support frame (500) located below the clamping part (310), and the support frame (500) is provided with a receiving hole (510) for accommodating the stroke measuring rod below the hydraulic top cylinder (830) to pass through. The main frame (100) is provided with a fixed pulley (430), and the flipping part (420) is connected to the piston rod of the flipping cylinder (410) through a connecting part (440), which passes around the fixed pulley (430).

2. The hydraulic jacking cylinder replacement device according to claim 1, characterized in that, It also includes a counterweight (600); the counterweight (600) is located on the main frame (100) and at one end away from the traction part (300).

3. The hydraulic jacking cylinder replacement device according to claim 1, characterized in that, The walking mechanism includes a roller (710) located at the lower end of the main frame (100) and a drive motor (700) for driving the roller (710) to roll.

4. A method for disassembling a hydraulic jacking cylinder, characterized in that, The replacement device according to any one of claims 1-3 includes the following steps: S1. Transport the replacement device to the lower track (810) of the leveling machine, start the walking mechanism, and drive the replacement device to walk into the main frame (800) of the leveling machine until the clamping part (310) is directly above the hydraulic top cylinder (830). S2. Operate the traction cylinder (200), extend the piston rod, fix the clamping part (310) to the hydraulic top cylinder (830), and disconnect the hydraulic top cylinder (830) from the leveling machine; S3. Start the tilting cylinder (410), drive the tilting part (420) to push the hydraulic top cylinder (830) to tilt, drive the walking mechanism, and the replacement device carries the hydraulic top cylinder (830) out of the main frame (800) of the leveling machine.

5. A method for installing a hydraulic jacking cylinder, characterized in that, The replacement device according to any one of claims 1-3 includes the following steps: S1. Transport the replacement device to the lower track (810) of the leveling machine, place the hydraulic top cylinder to be installed on the flipping part, and use the clamping part (310) to fix the hydraulic top cylinder. S2. Start the tilting cylinder (410) and drive the tilting part (420) to push the hydraulic top cylinder (830) to tilt until the highest height of the hydraulic top cylinder (830) is lower than the bending roller device (820). S3. Start the walking mechanism to drive the replacement device to the installation position of the hydraulic top cylinder (830).

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