Tool and method for disassembling and assembling screw-down bolt of cold rolling temper mill

Abstract

The invention discloses a cold rolling temper mill screw-down bolt disassembling and assembling tool which comprises a machine base, a motor, a rotating piece, a first guide sleeve, a movable plate and a driving rod. The motor is fixedly installed on the machine base, the rotating piece is rotatably installed on the machine base, and an output shaft of the motor is connected with the rotating piece through the middle transmission part. A plurality of first guide sleeves are arranged; the number of the driving rods is multiple, each driving rod is vertically arranged, the upper end of each driving rod is fixedly installed on the movable plate, the lower end of each driving rod extends into one first guide sleeve and is in clearance fit with the first guide sleeve, and all the driving rods are distributed around a reference center line; a connecting hole is formed in the movable plate, so that the movable plate and the pressing bolt are fixed together after a connecting bolt penetrates through the connecting hole, and a distance exists between the center line of the connecting hole and the reference center line. The device can realize automatic and accurate control of the disassembly and assembly process of the screw-down bolt, the disassembly and assembly process is safe, rapid and labor-saving, and the disassembly and assembly efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of cold rolling leveling machines, and more specifically, relates to tools and methods for disassembling and assembling bolts in cold rolling leveling machines. Background Technology

[0002] The cold rolling leveling mill is the core equipment in a strip steel finishing production line. Its main function is to improve the strip shape, flatness, and surface properties through rolling pressure. At the top of the leveling mill frame, the pressing device, as a key load-bearing mechanism for controlling the roll gap and adjusting the rolling force, bears enormous static loads and dynamic impacts through its internal pressing bolts. Because the pressing bolts are subjected to heavy loads, vibrations, and high-frequency adjustments for extended periods, wear and fatigue of their threaded pairs are inevitable. Therefore, regularly disassembling, inspecting, or replacing the pressing bolts is a necessary maintenance measure to ensure the normal operation of the leveling mill.

[0003] In current engineering practice, due to the high frame of the leveling machine (usually over 5 meters) and the complex hydraulic pipelines, sensors, and drive shafts arranged on top, the working space for pressing down bolts is extremely small and high. Current assembly and disassembly work mainly relies on a primitive combination of manual labor, overhead cranes, and chain hoists. Pressing down bolts are heavy, high-precision components, with individual parts often weighing hundreds of kilograms or even more.

[0004] Traditional maintenance methods require repair personnel to work on temporary scaffolding or narrow platforms atop machine frames, often requiring multiple people to operate the chain hoist while others manually turn the bolts. During this process, the constant shifting of the center of gravity and uneven stress on the chain hoist can cause the bolts, weighing hundreds of kilograms, to sway violently or slip due to sling slippage, leading to accidental tipping. In the confined space, this poses a significant risk of crushing, scraping, or even serious falls. Furthermore, manually turning heavy bolts requires enormous torque, often necessitating the use of extended-arm wrenches for repeated operations. In the harsh environment of high temperatures, oil contamination, and height, this intense physical exertion results in extremely low maintenance efficiency; the removal and installation of a single bolt can often take hours or even longer, severely hindering the overall maintenance progress of the production line and reducing equipment utilization.

[0005] Furthermore, during installation, maintenance personnel need to use an overhead crane for hoisting and manually straighten the bolts in mid-air, attempting to align the first thread at the top with the nut hole on the presser frame. Due to the lack of precise mechanical guidance, this type of cable hoisting is prone to axial tilting. If the threads are not properly aligned and forced in, thread seizure can easily occur, causing permanent damage to the expensive presser bolts and threaded holes. Summary of the Invention

[0006] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a tool and method for disassembling and assembling the pressing bolts of a cold rolling leveling machine, which is safe, fast and labor-saving, and has high disassembly and assembly efficiency.

[0007] To achieve the above objectives, according to one aspect of the present invention, a tool for removing and assembling the pressing bolts of a cold rolling mill is provided, comprising a base, a motor, a rotating component, a first guide sleeve, a moving plate, and a drive rod, wherein: The base is provided with lifting holes; The motor is fixedly mounted on the base, the rotating component is rotatably mounted on the base, and the output shaft of the motor is connected to the rotating component through an intermediate transmission component to drive the rotating component to rotate. Multiple first guide sleeves are provided, and the center line of each first guide sleeve is vertically arranged, and each first guide sleeve is fixedly installed on the rotating component; There are multiple drive rods, each of which is vertically arranged. The upper end of each drive rod is fixedly mounted on the moving plate, and the lower end of each drive rod extends into a first guide sleeve and is clearance-fitted with the first guide sleeve so that the drive rod can move up and down along the axial direction of the first guide sleeve. All the drive rods are distributed around a reference center line, wherein the reference center line is coaxial with the center line of the press-down bolt to be disassembled. The movable plate is provided with a connecting hole so that the connecting bolt passes through the connecting hole and fixes the movable plate and the pressing bolt together. There is a gap between the center line of the connecting hole and the reference center line.

[0008] Preferably, the base includes a fixed frame, a receiving cylinder, and a plurality of lifting lugs. The receiving cylinder is fixedly installed on the fixed frame to receive the pressing bolts, and each lifting lug is provided with a lifting hole.

[0009] Preferably, the base includes a fixed base and a second guide sleeve, the second guide sleeve being vertically arranged and the lower end of the second guide sleeve being fixedly mounted on the fixed base; A central guide rod is installed on the moving plate, and the lower end of the central guide rod extends into the second guide sleeve. The central guide rod and the second guide sleeve are in clearance fit. The centerline of the second guide sleeve is the reference centerline.

[0010] Preferably, the central guide rod includes a main rod body and a piston mounted on the main rod body, the piston being in clearance fit with the second guide sleeve.

[0011] Preferably, the second guide sleeve includes an upper sleeve, a middle sleeve, and a lower sleeve arranged coaxially from top to bottom. There is a gap between the upper sleeve and the middle sleeve. The upper sleeve is connected to the middle sleeve by multiple connecting rods. The upper end of the lower sleeve is fixedly installed on the middle sleeve. The middle sleeve is fixed together with a support frame installed on the fixed base.

[0012] Preferably, an elastic limiting pad capable of elastic deformation is installed on the fixed base, and the elastic limiting pad is located inside the second guide sleeve so that after the bottom of the central guide rod descends and presses the elastic limiting pad, it generates elastic deformation and supports the bottom of the central guide rod. The lower sleeve is also provided with an observation window on its side wall to observe the real-time position of the bottom of the central guide rod inside the second guide sleeve.

[0013] Preferably, the moving plate is provided with a central spline hole, the center line of the central spline hole is the reference center line, the upper end of the central guide rod is provided with a spline, the spline of the central guide rod is engaged with the central spline hole on the moving plate, and the lower end of the central guide rod is supported by the base. The connecting holes on the moving plate are divided into multiple groups of connecting holes, and the multiple connecting holes in each group are distributed on the same circle. Different groups of connecting holes are distributed on different circles to accommodate various sizes of press-down bolts.

[0014] Preferably, the top surface of the moving plate is provided with a plurality of ultrasonic transducers arranged in a ring, which are used to vibrate the pressing bolt by activating the ultrasonic transducers in the initial stage of pressing bolt disassembly, so as to loosen the pressing bolt.

[0015] Preferably, the rotating component includes a driven gear, which is rotatably mounted on the machine base, and the intermediate transmission component includes a driving gear; The output shaft of the motor is vertically arranged, and the drive gear is fixedly mounted on the output shaft of the motor; The driven gear is mounted on the machine base via bearings. The center line of the driven gear is vertically arranged, and the driven gear meshes with the driving gear. All the first guide sleeves are mounted on the driven gear.

[0016] According to another aspect of the present invention, a method for disassembling and assembling press bolts using the aforementioned cold rolling mill press bolt disassembly and assembly tool is also provided, comprising the following steps: 1) The process of removing the bolt is as follows: 1.1) The bottom surface of the press-down bolt to be removed is fixedly connected to the moving plate by connecting bolts, wherein the moving plate is located above all the first guide sleeves and there is a gap between it and each of the first guide sleeves; 1.2) Start the motor, the motor drives the rotating part to rotate, the rotating part drives the moving plate to rotate in the first direction through the first guide sleeve and the drive rod, so that the pressing bolt gradually unscrews out of the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt unscrews out, the pressing bolt and the moving plate gradually descend. 1.3) After the pressing bolts are completely unscrewed from the bolt holes of the cold rolling leveling machine, the motor stops rotating, and the overhead crane moves the pressing bolt removal and installation tools and the pressing bolts as a whole out of the work area. (2) The installation process of pressing down the bolts is as follows: 2.1) Fix the pressing bolts to be installed to the moving plate with connecting bolts, and let all the first guide sleeves support the moving plate together. Use an overhead crane to lift the pressing bolt disassembly and assembly tools and the pressing bolts to be installed to the installation position, and align the top of the pressing bolts with the bolt holes of the cold rolling mill. 2.2) Start the motor. The motor drives the rotating part to rotate. The rotating part drives the moving plate to rotate in a second direction opposite to the first direction through the first guide sleeve and the drive rod. As the moving plate rotates, the pressing bolt is gradually screwed into the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt is screwed in, the pressing bolt and the moving plate gradually rise. 2.3) After the pressing bolts are screwed in, remove the connecting bolts used to connect the moving plate and the bottom of the pressing bolts, and the overhead crane will move the pressing bolt removal and installation tools of the cold rolling leveling machine out of the work area.

[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1) The cold rolling mill pressing bolt removal and installation tool of the present invention is driven by a motor, guided by a first sleeve, and driven by a drive rod to transmit torque and allow axial movement of the pressing bolt, establishing an automated removal and installation cycle. Only the forward and reverse rotation of the motor is required to complete the heavy rotating work that previously required multiple people and several hours. This leap from manual to mechanical automation shortens the operation time for a single pressing bolt and significantly improves the maintenance efficiency of the production line.

[0018] The heavy torque output and load support are handled by the mechanical structure. Maintenance personnel no longer need to handle rotating heavy bolts at close range on a narrow platform, avoiding the risk of crushing or crushing injuries caused by tool slippage, exhaustion of force, or bolt wobbling. The stable structure of the tool itself replaces the unstable temporary support solution, providing a safety guarantee for the maintenance of the cold rolling leveling machine.

[0019] 2) The cold rolling mill bolt removal and installation tool of the present invention features a clearance fit between the first guide sleeve and the drive rod. This structure allows the drive rod to slide freely up and down within the sleeve while rotating with the first guide sleeve. This solves the interference problem between the rotational power input and the axial displacement output, enabling the tool to adapt to the natural helical lead of the bolt without the need for additional external lifting or pulling force.

[0020] 3) The cold rolling mill pressing bolt disassembly and assembly tool of this invention is equipped with multiple first guide sleeves and multiple drive rods, which are distributed around the reference center line (co-linear with the pressing bolt center line), realizing multi-point symmetrical transmission of torque. Compared with single-point drive, multiple drive rods share the rotational resistance, greatly reducing the stress concentration phenomenon of a single connecting rod. This circumferentially uniform force design prevents the moving plate from generating tilting torque during rotation, ensuring that the pressing bolt is always in a state of force balance, and avoiding the bolt from getting stuck or seizing with the nut hole due to lateral load.

[0021] 4) The cold rolling leveling machine bolt removal and installation tool of the present invention has a clearance fit between the drive rod and the first guide sleeve, which provides a certain radial tolerance for the system. In actual operation, considering the possible slight deformation or installation error of the leveling machine frame, this clearance can play a buffer role for automatic centering, absorb the mechanical stress caused by the incomplete alignment of the axes, and thus protect the precision drive mechanism from being damaged.

[0022] 5) The cold rolling mill press bolt removal and installation tool of the present invention has a drive rod distributed around a reference center line coaxial with the center line of the press bolt to be removed or installed. This coaxial design ensures high-precision removal and installation. It guarantees that the rotation center of the tool coincides with the thread center of the press bolt, eliminating radial runout caused by eccentric rotation, thereby ensuring that the first thread of the press bolt can be accurately aligned when it enters the bolt hole of the cold rolling mill, effectively avoiding permanent damage caused by thread misalignment.

[0023] 6) The bolt removal and installation tool for the cold rolling leveling machine of the present invention has its guide sleeve, drive rod, and other components arranged vertically, making the entire tool a vertically slender geometric body. This compact shape greatly reduces the radial dimension of the tool, allowing it to easily penetrate into the dense network of hydraulic lines and sensors on the top of the leveling machine, directly reaching the working point of the bolt, thus solving the problem of deploying large equipment in a limited space. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional view of the receiving cylinder in this invention; Figure 3This is a three-dimensional schematic diagram of the drive rod and the central guide rod mounted on the moving plate of the present invention; Figure 4 This is a three-dimensional schematic diagram of the second guide sleeve in this invention; Figure 5 This is a three-dimensional schematic diagram of the first guide sleeve installed on the driven gear in this invention; Figure 6 This is a three-dimensional diagram of the motor mounted on the base; In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Lifting lug; 2. Receiving cylinder; 3. Moving plate; 4. Drive rod; 5. Central guide rod; 6. Piston; 7. Upper sleeve; 8. Connecting rod; 9. Middle sleeve; 10. Lower sleeve; 11. First guide sleeve; 12. Driven gear; 13. Fixing frame; 14. Motor; 15. Support frame; 16. Fixed base; 17. Drive gear; 18. Connecting hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Reference Figures 1-6 The tool for removing and assembling the bolts of the cold rolling leveling machine includes a base, a motor 14, a rotating component, a first guide sleeve 11, a moving plate 3, and a drive rod 4, wherein: The base is provided with lifting holes; The motor 14 is fixedly mounted on the base, and the rotating component is rotatably mounted on the base. The output shaft of the motor 14 is connected to the rotating component through an intermediate transmission component to drive the rotating component to rotate. The intermediate transmission component can be an existing transmission component, such as a gear transmission component or a chain transmission component.

[0027] Multiple first guide sleeves 11 are provided, which can be used to cooperate to support the moving plate 3. The center line of each first guide sleeve 11 is vertically arranged, and each first guide sleeve 11 is fixedly installed on the rotating component. After the pressing bolt is completely unscrewed, the moving plate 3 rests on the first guide sleeve 11, and these first guide sleeves 11 can support the moving plate 3. Alternatively, when it is necessary to install the pressing bolt into the bolt hole of the cold rolling leveling machine, the moving plate 3 can also be pre-placed on the first guide sleeve 11, and the first guide sleeve 11 supports the moving plate 3 and the pressing bolt connected to the moving plate 3.

[0028] There are multiple drive rods 4, each of which is vertically arranged. The upper end of each drive rod 4 is fixedly mounted on the moving plate 3, and the lower end of each drive rod 4 extends into a first guide sleeve 11 and is clearance-fitted with the first guide sleeve 11 so that the drive rod 4 can move up and down along the axial direction of the first guide sleeve 11. All drive rods 4 are distributed around a reference center line, wherein the reference center line is coaxial with the center line of the press-down bolt to be disassembled. The movable plate 3 is provided with a connecting hole 18 so that the connecting bolt passes through the connecting hole 18 to fix the movable plate 3 and the pressing bolt together. There is a gap between the center line of the connecting hole 18 and the reference center line. Therefore, the connecting hole 18, the drive rod, etc. are all eccentrically arranged relative to the pressing bolt.

[0029] This invention uses motor 14 as the prime mover, providing a continuous and stable torque. When handling large-diameter, heavy-load parts such as the pressing bolts of a cold rolling mill, this constant torque output ensures that the disassembly and assembly process is free from mechanical impact due to fluctuations in human force, effectively protecting the threaded pairs of the pressing bolts from damage by instantaneous shear forces. The intermediate transmission component not only serves as the power connection but also achieves precise speed ratio control during motion conversion. This allows the rotational speed of the rotating parts to be kept within a very low, controllable range, providing a basis for fine-tuning the pressing bolts' insertion or removal, greatly improving the precision of the operation. Both motor 14 and the rotating parts are mounted on a robust base. The base, as the basic structure, effectively absorbs the vibration generated by the operation of motor 14 and the reaction torque generated when the pressing bolts rotate, ensuring the dynamic balance performance of the entire power system and extending the tool's service life.

[0030] The lifting holes on the base allow the tool to connect to an overhead crane inside the factory. During dismantling, the tool not only serves as a rotational drive source but also acts as a temporary lifting container after the bolts are disengaged from the bolt holes. During installation, the overhead crane assists in spatial positioning by attaching the tool through the lifting holes. This integrated drive and carrier design greatly simplifies the work process.

[0031] The cold rolling mill press bolt disassembly and assembly tool, with its multi-point rotational guide structure, decoupled axial and radial degrees of freedom design, and high-precision coaxial power transmission system, technically solves the technical pain points of difficult, inaccurate, and risky disassembly and assembly of heavy press bolts in extremely confined, high-altitude environments. The components are not simply mechanically stacked, but rather deeply coupled through kinematics and dynamics, achieving precise control over the entire press bolt disassembly and assembly process. This encompasses multiple dimensions, including dynamic stability, structural rigidity, motion coordination, spatial adaptability, and operational safety, providing strong equipment support for the continuous and stable production of the cold rolling mill.

[0032] Furthermore, the base includes a fixed frame 13, a receiving cylinder 2, and a plurality of lifting lugs 1. The receiving cylinder 2 is fixedly installed on the fixed frame 13 to accommodate the pressing bolts, and each of the lifting lugs 1 is provided with a lifting hole.

[0033] The receiving cylinder 2, as the core load-bearing and space-limiting component of the machine base, has an inner diameter slightly larger than the outer diameter of the pressing bolt, and an axial length generally smaller than the overall length of the pressing bolt. This enclosed design provides a boundary for the pressing bolt to gradually unscrew and descend during disassembly. Through the shielding effect of the receiving cylinder 2, the pressing bolt, weighing hundreds of kilograms, is confined within the preset axial space, effectively preventing radial swaying or tilting of the pressing bolt with a large length-to-diameter ratio after it loses the constraint of the threaded pair.

[0034] This invention constructs a multi-point support hoisting system by setting multiple lifting lugs 1 on the base and equipping each lug 1 with an independent lifting hole. During overall hoisting using an overhead crane, the lifting force is evenly distributed along the circumference of the base via the multiple lifting lugs 1, greatly reducing the potential for localized stress concentration caused by single-point stress and enhancing the fatigue strength and reliability of the hoisting operation. It is important to note that after the multiple lifting lugs 1 are connected to the multiple lifting cables on the overhead crane, the lifting cables must not interfere with the pressing bolt; that is, the lifting cables must not affect the space above the pressing bolt for the disassembly / assembly tool. Preferably, two lifting lugs 1 are provided, symmetrically arranged at 180°. The lifting cables on the overhead crane, after being suspended from the lifting lugs 1, can be inclined rather than vertical, which increases the space between the lifting cables, preventing interference with the pressing bolt and facilitating the overhead crane to hoist the disassembly / assembly tool directly below the pressing bolt.

[0035] Because the lifting holes are directly integrated into the machine base, maintenance personnel can quickly lift the tool with pre-installed pressing bolts to the installation position using an overhead crane. This design, which integrates the power source and the load-bearing body, allows the removed pressing bolts to be moved out with the tool as a whole, and the tool can be positioned as a whole during installation. This eliminates the time lost from multiple lifting and secondary clamping, significantly shortening the downtime maintenance cycle.

[0036] Furthermore, the base includes a fixed base 16 and a second guide sleeve, the second guide sleeve being vertically arranged and the lower end of the second guide sleeve being fixedly installed on the fixed base 16.

[0037] A central guide rod 5 is installed on the moving plate 3. The lower end of the central guide rod 5 extends into the second guide sleeve, and the central guide rod 5 is clearance-fitted with the second guide sleeve.

[0038] The centerline of the second guide sleeve is the reference centerline.

[0039] Initially, during the removal of the pressing bolt, there is a gap between the lower end of the central guide rod 5 and the fixed base 16. The fixed base 16 should not affect the descent of the central guide rod 5 and the moving plate 3. After the pressing bolt is completely unscrewed, the lower end of the central guide rod 5 can be supported by the fixed base 16, thus supporting the moving plate 3. Alternatively, when it is necessary to install the pressing bolt onto the bolt hole of the cold rolling mill, the lower end of the central guide rod 5 can be pre-placed on the fixed base 16, which supports the moving plate 3 and the pressing bolt connected to it.

[0040] Therefore, the moving plate 3 can be supported by the central guide rod 5 and the fixed base 16, and / or by all the first guide sleeves 11.

[0041] The centerline of the second guide sleeve is aligned with the reference centerline (i.e., the centerline of the press-down bolt). This high degree of axial coincidence ensures that the geometric center of the moving plate 3 remains stable during rotation. Through the rigid constraint of the second guide sleeve, the central guide rod 5 will not exhibit any radial wobble when performing axial displacement. This is crucial for the installation of the press-down bolt, ensuring precise thread alignment during the first turn and preventing damage to the threaded pair due to axial tilt.

[0042] The vertically positioned second guide sleeve is fixedly mounted on the fixed base 16, providing a vertically upward reference system for the entire tool. When the moving plate 3 drives the pressing bolt in a helical motion, the vertical sliding of the central guide rod 5 within the second guide sleeve is strictly limited, ensuring the purity of the motion trajectory and effectively reducing vibration.

[0043] The central guide rod 5 and the second guide sleeve are fitted with a clearance fit. This design not only ensures that the central guide rod 5 can move freely up and down within the sleeve, but also allows for a very small elastic deformation compensation margin in the system. In the complex and temperature-varying environment of the cold rolling mill maintenance, an appropriate clearance fit can effectively prevent mechanical jamming caused by thermal expansion and contraction or deformation under stress, ensuring the continuity of disassembly and assembly operations.

[0044] This invention, by introducing a fixed base 16, a second guide sleeve, a central guide rod 5, and their specific coaxial alignment, provides the tool with strong centripetal force and vertical guiding capability at the underlying structure level. This not only solves the problem of axial instability of heavy parts during rotational displacement, but also significantly improves the reliability and safety of the mechanical system through scientific load distribution, providing hardware support for the efficient maintenance of cold rolling leveling machines.

[0045] Furthermore, the central guide rod 5 includes a main rod body and a piston 6 mounted on the main rod body. The piston 6 is in clearance fit with the second guide sleeve, and the piston 6 is preferably mounted at the lower end of the main rod body.

[0046] The central guide rod 5, by adding a piston 6 to the main rod body, increases the effective contact area of ​​the sliding pair. This design allows the axial and radial loads to be more evenly distributed on the inner wall of the second guide sleeve when the moving plate 3 is helically moving under the weight of a bolt weighing hundreds of kilograms. The piston 6, with its specific geometric length, forms a long guiding fit with the second guide sleeve, thus strongly restraining the tilting tendency of the main rod body. This structure ensures that the moving plate 3 maintains extremely high verticality during the descent or ascent of the bolt, avoiding eccentric vibration of the moving plate 3 caused by torque fluctuations.

[0047] The clearance fit design between piston 6 and the second guide sleeve provides the necessary freedom for the vertical movement of the central guide rod 5 while ensuring guiding accuracy. This fit effectively reduces frictional resistance during movement, ensuring that the torque output by motor 14 can be more efficiently converted into the rotational power of the pressing bolt, rather than being wasted on overcoming excessive friction in the guide components. In the complex temperature difference environment of the cold rolling workshop, the clearance fit allows for the thermal expansion and contraction of different components. This ensures that the central guide rod 5 can still move smoothly within the second guide sleeve under the temperature rise caused by continuous high-intensity operation, eliminating the risk of mechanical jamming due to excessive tightness. The combination of piston 6 and the main rod body enhances the bending section modulus of the central guide rod 5. When the pressing bolt encounters slight resistance and generates axial impact in the initial screwing stage, piston 6 can play a stabilizing and buffering role within the second guide sleeve, protecting the upper moving plate 3 and drive mechanism from damage.

[0048] Furthermore, the second guide sleeve includes an upper sleeve 7, a middle sleeve 9, and a lower sleeve 10 arranged coaxially from top to bottom. There is a gap between the upper sleeve 7 and the middle sleeve 9. The upper sleeve 7 is connected to the middle sleeve 9 by multiple connecting rods 8. The upper end of the lower sleeve 10 is fixedly installed on the middle sleeve 9. The middle sleeve 9 is fixed together with the support frame 15 installed on the fixed base 16.

[0049] The second guide sleeve is divided into an upper sleeve 7, a middle sleeve 9, and a lower sleeve 10, thus decomposing the long guide stroke into multiple functional areas. This design effectively avoids the overall bending deformation that a single ultra-long sleeve is prone to under stress, and ensures the axial stability of the central guide rod 5 throughout its entire stroke by arranging multiple segments coaxially.

[0050] The central sleeve 9, serving as the core connecting the upper and lower structures, is fixed together with the support frame 15 mounted on the fixed base 16. This design, which places the main load-bearing point in the middle of the structure, shortens the force arm and greatly enhances the vibration resistance of the tool when bearing the weight of the pressed bolt and the rotational torque, ensuring the stability of the reference frame.

[0051] The gap between the upper sleeve 7 and the middle sleeve 9, along with the hollow connection of multiple connecting rods 8, provides an observation window for the operation process. This allows maintenance personnel to visually confirm the forward movement of the central guide rod 5 inside without disassembling the sleeves, improving the controllability of the operation.

[0052] The upper end of the lower sleeve 10 is fixedly mounted on the middle sleeve 9, forming a closed or semi-closed guide cavity at the bottom. This stepped fixing mode allows the lower sleeve 10 to be specifically designed to limit and protect the end stroke of the piston 6, while the middle sleeve 9 focuses on the load connection with the fixed base 16, thus achieving decoupling of the functions of each component.

[0053] When long-term operation causes wear on the inner wall of a certain section, the three-section structure allows for targeted inspection or replacement of only the damaged upper sleeve 7, middle sleeve 9, or lower sleeve 10, without having to discard the entire guide system.

[0054] Furthermore, an elastic limiting pad capable of elastic deformation is installed on the fixed base 16, and the elastic limiting pad is located inside the second guide sleeve so that it can generate elastic deformation and support the central guide rod 5 after the central guide rod 5 descends and presses against the elastic limiting pad.

[0055] The lower sleeve 10 is also provided with an observation window on its side wall, so that the operator can observe the real-time height position of the central guide rod 5 within the second guide sleeve. If there is a piston on the central guide rod 5, the real-time height position of the piston can be observed directly.

[0056] During the disassembly of the pressing bolt, the central guide rod 5 descends synchronously with the pressing bolt as it unscrews from the bolt hole of the cold rolling leveling machine. Since the pressing bolt is a heavy component, it accumulates significant kinetic energy during its descent. The elastic limiting pad allows the lower end of the central guide rod 5 to convert this kinetic energy into elastic potential energy and dissipate it through the elastic deformation of the pad when it reaches the end of its stroke. This design prevents a rigid collision between the lower end of the central guide rod 5 and the fixed base 16, protecting the central guide rod 5 and the entire machine base structure from mechanical impact damage.

[0057] The flexible support provided by the elastic limiting pad effectively reduces stress concentration caused by the momentary pause at the end of the disassembly process. This not only protects the sealing or mating surface of piston 6, but also reduces the reverse impact force transmitted to drive rod 4 and moving plate 3, ensuring the structural integrity and reliability of the cold rolling leveling machine's bolt removal and assembly tool under long-term, high-frequency operation.

[0058] The longitudinal observation window provides operators with an intuitive visual reference. In the complex and space-constrained environment of the top of a cold rolling mill, operators can use the longitudinal observation window to observe the precise height position of the piston 6 within the lower sleeve 10 in real time. This real-time position feedback is crucial for determining whether the pressing bolt has completely disengaged from the bolt hole, greatly improving the predictability of the operation.

[0059] By observing the changes in the scale or position of the central guide rod 5 relative to the longitudinal observation window, maintenance personnel can more accurately control the start and stop timing of the motor 14. During installation, the observation window can be used to confirm the rising height of the piston 6, which helps determine the depth to which the bolt enters the nut hole, ensuring the standardization and precision of the installation work. This effectively prevents secondary adjustments due to over-screwing or insufficient displacement, significantly improving maintenance efficiency.

[0060] The longitudinal observation window and the elastic limiting pad together form a dual safety mechanism of visual warning and buffer protection. When the operator observes that the piston 6 is approaching the bottom of the lower sleeve 10 (i.e., approaching the elastic limiting pad), they can take deceleration or stop operations in advance. This predictive operational logic greatly reduces the risk of mechanical accidents caused by misoperation and ensures inherent safety in confined, high-altitude working environments.

[0061] Furthermore, the moving plate 3 is provided with a central spline hole, the center line of the central spline hole is the reference center line, the upper end of the central guide rod 5 is provided with a spline, the spline of the central guide rod 5 is engaged with the central spline hole on the moving plate 3, and the lower end of the central guide rod 5 is supported by the machine base. The connecting holes 18 on the moving plate 3 are divided into multiple groups of connecting holes, and the multiple connecting holes 18 in each group of connecting holes are distributed on the same circle. Different groups of connecting holes are distributed on different circles to accommodate various sizes of press-down bolts.

[0062] The spline and center spline hole connection significantly increases the effective contact area compared to a single-key connection, as multiple tooth surfaces participate in torque transmission. When the bolt removal and installation tools on the cold rolling mill are in operation, this design significantly reduces the contact stress per unit area, preventing plastic deformation or shear failure at the connection point under high torque output. Furthermore, the spline can work in conjunction with the drive rod 4 to drive the rotating plate 3 to tighten the bolt, preventing the drive rod 4, which is eccentrically positioned relative to the bolt, from bending laterally.

[0063] The spline structure has a natural self-centering function, ensuring that the geometric center of the moving plate 3 remains highly aligned with the axis of the central guide rod 5 during rotation. This high-precision coaxiality effectively eliminates radial runout during rotation, thus ensuring that the movement trajectory of the pressing bolt is precisely controllable during screwing in or out.

[0064] The spline fit allows the moving plate 3 to rotate synchronously with the central guide rod 5 (or driven by the drive rod 4) while maintaining smooth sliding freedom in the axial direction. When dealing with the vertical displacement of the pressing bolt caused by the thread lead, the spline fit ensures that the power transmission is not interfered with by changes in axial position, maintaining the continuity of the system's motion.

[0065] By arranging connecting hole groups of different diameters on the moving plate 3, this tool achieves compatibility with various specifications of press-down bolts. In actual production, the fixing dimensions of the bottom of the press-down bolts often differ between different models of cold rolling leveling machines. This design eliminates the need for maintenance personnel to develop special molds for each type of bolt; they can simply select the corresponding connecting hole group to complete the locking process. Multiple connecting holes 18 within each connecting hole group are symmetrically distributed on the same circumference, ensuring that the tensile and shear forces borne by the connecting bolts are balanced circumferentially after the moving plate 3 is fixed to the press-down bolt. This symmetrical distribution effectively prevents the moving plate 3 from deflecting due to uneven force distribution, protecting the overall structural safety of the cold rolling leveling machine press-down bolt disassembly and assembly tool.

[0066] Furthermore, the top surface of the moving plate 3 is equipped with multiple ultrasonic transducers arranged in a ring. These transducers are used to vibrate the bolt during the initial stage of bolt removal by activating the ultrasonic transducers, thereby loosening the bolt. The ultrasonic transducers can be powered by a built-in DC power supply on the moving plate 3, or they can be connected to a slip ring mounted on the moving plate 3, which is powered by an external power source.

[0067] The gap between the threads of the press-down bolt is often filled with dried grease, scale, and rust products. High-frequency alternating stress waves generated by the ultrasonic transducer are transmitted to the press-down bolt via the moving plate 3. Due to the significant difference in acoustic impedance between the metal press-down bolt and the brittle fouling layer, the vibration waves generate strong shear and tensile forces at the contact interface, causing micro-cracks in the fouling layer and its rapid fragmentation. This "loosening" effect creates tiny physical gaps in the threaded pair, which was originally in a "cold-welded" or "locked" state. According to the vibration softening theory of tribology, high-frequency vibration can significantly reduce the static friction of the contact surface. Under the action of ultrasound, the frictional characteristics of the contact surface change from pure sliding friction to composite friction modulated by high-frequency micro-amplitude vibration. This significantly reduces the starting torque required by the motor 14 at startup, avoiding mechanical shock caused by torque overload.

[0068] The large diameter of the press-down bolt means that single-point vibration causes energy to attenuate rapidly during propagation, creating a "vibration dead zone." A symmetrical annular distribution ensures that ultrasonic energy is uniformly coupled into the bolt body from the bottom circumference. This all-around mechanical wave coverage guarantees that the threaded pair formed by the press-down bolt and the bolt hole of the cold rolling mill achieves a simultaneous loosening effect within a 360° range, effectively preventing lateral seizing caused by unilateral loosening. Multiple ultrasonic transducers operate synchronously, and their emitted coherent waves create a superposition effect near the centerline of the press-down bolt (which is also the reference centerline). This interference enhancement allows vibration energy to penetrate deeper into the bolt's high length-to-radial ratio, ensuring that even deep threads far from the bottom receive vibration amplification.

[0069] Under heavy load conditions, the forceful, head-on rotation can easily cause molecular-level adhesion between the metal surfaces of bolts and nuts, resulting in thread seizure. Ultrasonic vibration, by disrupting the continuity of microscopic contact points, eliminates this potential adhesion risk before rotational motion occurs, greatly protecting the surface integrity of the expensive threaded pair. Because the ultrasonic waves pre-loosen the connection, the motor 14 and intermediate transmission and rotating components are under a stable load during operation. This smooth operating curve avoids axial runout caused by sudden torque changes, thereby extending the service life of bearings and gears.

[0070] Ultrasonic transducers generate high-frequency, low-amplitude vibrations, typically operating between 20kHz and 100kHz, with amplitudes only on the micrometer scale. The alternating stress generated by ultrasound is far below the yield strength of the material used in cold-rolled flattening bolts. This vibration is insufficient to cause permanent displacement of the metal lattice or macroscopic cracks in the bolt. The dirt layer (dried grease, scale, or rust) in the thread gaps can also cause damage. Due to the difference in acoustic impedance between the dirt layer and the high-strength steel, vibration generates shear force at the interface, causing the brittle dirt to break off. With proper ultrasonic transducer parameter design, ultrasonic vibration can prevent damage to the threaded pair and loosen the bolt. Traditional methods of unscrewing bolts involve forcibly rotating with a chain hoist, pulling with an overhead crane, or even striking with a sledgehammer. This macroscopic impact force easily causes localized plastic deformation or seizing (cold welding) of the threads. This invention uses ultrasound to "loosen" the resistance source, reducing the initial torque during motor startup. This means that the bolt rotates with less frictional resistance, greatly reducing the probability of the bolt threads seizing.

[0071] Furthermore, the rotating component includes a driven gear 12, which is rotatably mounted on the base, and the intermediate transmission component includes a driving gear 17; The output shaft of the motor 14 is vertically arranged, and the drive gear 17 is fixedly installed on the output shaft of the motor 14; The driven gear 12 is mounted on the machine base via bearings. The center line of the driven gear 12 is vertically arranged, and the driven gear 12 meshes with the driving gear 17. All the first guide sleeves 11 are mounted on the driven gear 12.

[0072] This invention establishes a non-slip, rigid power transmission chain by configuring the intermediate transmission component to include a driving gear 17 that directly meshes with the driven gear 12, which is a rotating component. This gear transmission method ensures that the power output from the motor 14 is transmitted to the rotating component at a constant transmission ratio, avoiding slippage or lag that may occur in belt or chain drives. This is crucial for the disassembly and assembly of press-down bolts, which require precise control of the rotation angle. The diameter difference between the driving gear 17 and the driven gear 12 can be optimized according to the torque requirements during the maintenance of the cold rolling mill. Through the reduction effect of the gear pair, the high-speed rotation of the motor 14 can be converted into the low-speed, high-torque output required by the rotating component. This mechanical gain ensures that the tool can easily overcome the huge initial friction between the heavy press-down bolt and the machine frame threads, guaranteeing the smoothness of the disassembly and assembly operation.

[0073] The driven gear 12 is mounted on the base via bearings, significantly reducing mechanical resistance during rotation. The precise positioning of the bearings ensures that the driven gear 12 maintains extremely high coaxiality even under high-speed or heavy-load conditions, preventing power loss and noise caused by radial runout. The output shaft of the motor 14 is vertically positioned, and the centerline of the driven gear 12 is also vertically positioned. This completely parallel vertical shaft system design ensures that the gravity vector of the entire power transmission system is aligned with the axis of motion. This effectively eliminates the uneven wear on the gear meshing surface caused by cantilever loads that may occur in traditional horizontal arrangements, greatly extending the service life of the gear pair and bearings.

[0074] All drive rods 4 are mounted on driven gears 12, meaning that driven gears 12 are not only transmission components but also power distribution discs. When driven gear 12 rotates under the influence of drive gear 17, the multiple drive rods 4 distributed on it can synchronously obtain rotational torque. This multi-point symmetrical mounting structure ensures that the thrust acting on the moving plate 3 is completely uniform in the circumferential direction. During the gradual unscrewing or screwing of the pressing bolt, the synchronously moving drive rods 4 effectively prevent the moving plate 3 from lateral deflection. This high degree of motion synchronization is the technical basis for ensuring that the centerline of the pressing bolt always coincides with the centerline of the bolt hole of the cold rolling mill, effectively avoiding the risk of thread seizure.

[0075] According to another aspect of the present invention, a method for disassembling and assembling press bolts using the aforementioned cold rolling mill press bolt disassembly and assembly tool is also provided, comprising the following steps: 1) The process of removing the bolt is as follows: 1.1) The bottom surface of the press-down bolt to be removed is fixedly connected to the moving plate 3 by connecting bolts, wherein the moving plate 3 is located above all the first guide sleeves 11 and has a distance from each of the first guide sleeves 11.

[0076] Step 1.1) establishes a temporary rigid whole, ensuring that the pressing bolt will not produce radial displacement or tilting relative to the tool during subsequent rotation, thus laying the foundation for stable helical motion.

[0077] 1.2) Start the motor 14. The motor 14 drives the rotating part to rotate. The rotating part drives the moving plate 3 to rotate in the first direction through the first guide sleeve 11 and the drive rod 4, so that the pressing bolt gradually unscrews out of the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt unscrews out, the pressing bolt and the moving plate 3 gradually descend.

[0078] The rotating component is driven to rotate by starting motor 14, and the torque is precisely transmitted to moving plate 3 via first guide sleeve 11 and drive rod 4. Due to the use of multi-point power transmission, the force is completely uniform in the circumferential direction, effectively preventing tilting torque generated during rotation and ensuring that the pressing bolt is always in a state of force balance.

[0079] As the pressing bolt rotates out in the first direction, the clearance fit characteristic of the drive rod 4 sliding freely within the first guide sleeve 11 allows the moving plate 3 to gradually descend synchronously with the pressing bolt. This structure adapts to the natural helical lead of the pressing bolt, eliminating the need for external jacking or pulling forces and resolving the interference problem between rotational power input and axial displacement output.

[0080] 1.3) After the pressing bolt is completely unscrewed from the bolt hole of the cold rolling leveling machine, the moving plate 3 should just be in contact with the first guide sleeve 11, or there should be a very small gap between them. Then, the moving plate 3 should fall onto the first guide sleeve 11 to prevent the impact force of the pressing bolt and the moving plate 3 from damaging the disassembly and assembly device. The motor 14 stops rotating, and the overhead crane moves the cold rolling leveling machine pressing bolt disassembly and assembly tool and the pressing bolt as a whole out of the work area. During this process, the tool not only serves as the driving source but also acts as a temporary lifting container, greatly simplifying the logistics and turnover process.

[0081] (2) The installation process of pressing down the bolts is as follows: 2.1) The pressing bolts to be installed are fixedly connected to the moving plate 3 by connecting bolts, and all the first guide sleeves 11 are supported by the moving plate 3 (when installing the pressing bolts, the moving plate 3 is supported by the first guide sleeves 11 and contacts the first guide sleeves 11, while when disassembling the pressing bolts, there is a gap between the moving plate 3 and the first guide sleeves 11, and space needs to be reserved for the moving plate 3 to descend so that the pressing bolts can be unscrewed from the bolt holes of the cold rolling leveling machine). The pressing bolt disassembly and assembly tools of the cold rolling leveling machine and the pressing bolts to be installed are hoisted to the installation position by an overhead crane, and the top of the pressing bolts is aligned with the bolt holes of the cold rolling leveling machine.

[0082] The tool and the bolts to be installed are hoisted to the installation position using an overhead crane, with the top aligned with the bolt holes of the cold rolling leveling machine. This integrated "drive + carrier" design allows for initial spatial positioning using the rigid frame of the tool, significantly reducing the difficulty of straightening heavy-duty parts in mid-air.

[0083] 2.2) Start the motor 14. The motor 14 drives the rotating part to rotate. The rotating part drives the moving plate 3 to rotate in a second direction opposite to the first direction through the first guide sleeve 11 and the drive rod 4. As the moving plate 3 rotates, the pressing bolt is gradually screwed into the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt is screwed in, the pressing bolt and the moving plate 3 gradually rise. If the first direction is counterclockwise, then the second direction is clockwise, and vice versa.

[0084] Because the power is precisely controlled by the motor 14 and the drive rod 4 is coaxially distributed around the reference center line, it ensures that the rotation center of the tool coincides with the center of the bolt hole, eliminating eccentric runout and thus ensuring the precise alignment of the first thread.

[0085] 2.3) After the pressing bolts are screwed in, remove the connecting bolts used to connect the moving plate 3 and the bottom surface of the pressing bolts. The overhead crane will then move the pressing bolt removal and installation tools of the cold rolling leveling machine out of the work area.

[0086] After the bolts are screwed in, the tool is separated from them by removing the connecting bolts. This design allows the tool to be quickly removed from the work site and moved out by the overhead crane as a whole, achieving closed-loop management of the work process and significantly shortening the downtime maintenance cycle.

[0087] This method establishes a mechanically controlled disassembly and assembly cycle, allowing maintenance personnel to complete heavy rotational work simply by operating motor 14 in both forward and reverse directions. This leap significantly improves the maintenance efficiency of the production line, drastically reducing the operation time for a single bolt. This method delegates the heavy torque output and load-bearing support to the mechanical structure. The stable structure of the tool replaces unstable temporary support solutions, avoiding the risk of crushing or impact damage due to exhaustion of force or component wobbling. Throughout the process, the engagement between the first guide sleeve 11 and the drive rod 4 provides radial tolerance, absorbing the mechanical stress caused by incomplete axis alignment, thereby protecting the precision drive mechanism and the threaded pair of the press-down bolt from tensile or shear damage.

[0088] This invention employs a vertically slender and compact structural design, precisely adapting to the confined, high-altitude working space where bolts are pressed down on cold rolling leveling machines. This structure requires no additional support components and can directly penetrate the work area, solving the problem of poor spatial adaptability of traditional tools, optimizing personnel positioning, avoiding the risk of sprains and crush injuries caused by improper posture, and significantly improving operational safety.

[0089] This invention employs a power transmission method combining a 14-motor drive with gear transmission, replacing the traditional manual or simple lifting-assisted disassembly and assembly mode. On the one hand, it avoids the problems of heavy bolts and easy swaying and instability during conventional disassembly and lifting, ensuring a stable and controllable disassembly and assembly process; on the other hand, it eliminates the need for maintenance personnel to manually lift or rotate bolts for extended periods, making operation convenient and labor-saving, significantly shortening maintenance time and improving work efficiency.

[0090] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tool for disassembling and assembling bolts on a cold rolling leveling machine, characterized in that, Includes a base, motor, rotating parts, first guide sleeve, moving plate, and drive rod, wherein: The base is provided with lifting holes; The motor is fixedly mounted on the base, the rotating component is rotatably mounted on the base, and the output shaft of the motor is connected to the rotating component through an intermediate transmission component to drive the rotating component to rotate. Multiple first guide sleeves are provided, and the center line of each first guide sleeve is vertically arranged, and each first guide sleeve is fixedly installed on the rotating component; There are multiple drive rods, each of which is vertically arranged. The upper end of each drive rod is fixedly mounted on the moving plate, and the lower end of each drive rod extends into a first guide sleeve and is clearance-fitted with the first guide sleeve so that the drive rod can move up and down along the axial direction of the first guide sleeve. All the drive rods are distributed around a reference center line, wherein the reference center line is coaxial with the center line of the press-down bolt to be disassembled. The movable plate is provided with a connecting hole so that the connecting bolt passes through the connecting hole and fixes the movable plate and the pressing bolt together. There is a gap between the center line of the connecting hole and the reference center line.

2. The tool for disassembling and assembling bolts on a cold rolling mill as described in claim 1, characterized in that, The base includes a fixed frame, a receiving cylinder, and multiple lifting lugs. The receiving cylinder is fixedly installed on the fixed frame to accommodate the pressing bolts. Each lifting lug is provided with a lifting hole.

3. The tool for disassembling and assembling bolts on a cold rolling mill according to claim 1, characterized in that, The base includes a fixed base and a second guide sleeve, the second guide sleeve is vertically arranged and the lower end of the second guide sleeve is fixedly installed on the fixed base; A central guide rod is installed on the moving plate, and the lower end of the central guide rod extends into the second guide sleeve. The central guide rod and the second guide sleeve are in clearance fit. The centerline of the second guide sleeve is the reference centerline.

4. The tool for removing and assembling bolts on a cold rolling mill according to claim 3, characterized in that, The central guide rod includes a main rod body and a piston mounted on the main rod body, and the piston is in clearance fit with the second guide sleeve.

5. The tool for removing and assembling bolts on a cold rolling mill as described in claim 3, characterized in that, The second guide sleeve includes an upper sleeve, a middle sleeve, and a lower sleeve arranged coaxially from top to bottom. There is a gap between the upper sleeve and the middle sleeve. The upper sleeve is connected to the middle sleeve by multiple connecting rods. The upper end of the lower sleeve is fixedly installed on the middle sleeve. The middle sleeve is fixed together with a support frame installed on the fixed base.

6. The tool for disassembling and assembling the pressing bolts of the cold rolling leveling machine according to claim 3, characterized in that, The fixed base is equipped with an elastic limiting pad that can produce elastic deformation, and the elastic limiting pad is located inside the second guide sleeve so that after the bottom of the central guide rod descends and presses the elastic limiting pad, it produces elastic deformation and supports the bottom of the central guide rod. The lower sleeve is also provided with an observation window on its side wall to observe the real-time position of the bottom of the central guide rod inside the second guide sleeve.

7. The tool for disassembling and assembling bolts on a cold rolling mill according to claim 3, characterized in that, The moving plate is provided with a central spline hole, the center line of the central spline hole is the reference center line, the upper end of the central guide rod is provided with a spline, the spline of the central guide rod is engaged with the central spline hole on the moving plate, and the lower end of the central guide rod is supported by the machine base. The connecting holes on the moving plate are divided into multiple groups of connecting holes, and the multiple connecting holes in each group are distributed on the same circle. Different groups of connecting holes are distributed on different circles to accommodate various sizes of press-down bolts.

8. The tool for disassembling and assembling bolts on a cold rolling mill according to claim 3, characterized in that, The top surface of the moving plate is equipped with multiple ultrasonic transducers arranged in a ring. These ultrasonic transducers are used to vibrate the pressing bolt during the initial stage of bolt removal by activating the ultrasonic transducers, thereby loosening the pressing bolt.

9. The tool for disassembling and assembling bolts on a cold rolling mill according to claim 1, characterized in that, The rotating component includes a driven gear, which is rotatably mounted on the base; the intermediate transmission component includes a driving gear. The output shaft of the motor is vertically arranged, and the drive gear is fixedly mounted on the output shaft of the motor; The driven gear is mounted on the machine base via bearings. The center line of the driven gear is vertically arranged, and the driven gear meshes with the driving gear. All the first guide sleeves are mounted on the driven gear.

10. A method for disassembling and assembling press bolts using the cold rolling mill press bolt disassembly and assembly tool as described in any one of claims 1 to 9, characterized in that, Includes the following steps: 1) The process of removing the bolt is as follows: 1.1) The bottom surface of the press-down bolt to be removed is fixedly connected to the moving plate by connecting bolts, wherein the moving plate is located above all the first guide sleeves and there is a gap between it and each of the first guide sleeves; 1.2) Start the motor, the motor drives the rotating part to rotate, the rotating part drives the moving plate to rotate in the first direction through the first guide sleeve and the drive rod, so that the pressing bolt gradually unscrews out of the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt unscrews out, the pressing bolt and the moving plate gradually descend. 1.3) Once the pressing bolts have been completely unscrewed from the bolt holes of the cold rolling leveling machine, the motor stops rotating, and the overhead crane moves the pressing bolt removal and installation tools and the pressing bolts themselves out of the work area. (2) The installation process of pressing down the bolts is as follows: 2.1) Fix the pressing bolts to be installed to the moving plate with connecting bolts, and let all the first guide sleeves support the moving plate together. Use an overhead crane to lift the pressing bolt disassembly and assembly tools and the pressing bolts to be installed to the installation position, and align the top of the pressing bolts with the bolt holes of the cold rolling mill. 2.2) Start the motor. The motor drives the rotating part to rotate. The rotating part drives the moving plate to rotate in a second direction opposite to the first direction through the first guide sleeve and the drive rod. As the moving plate rotates, the pressing bolt is gradually screwed into the bolt hole of the cold rolling leveling machine. At the same time as the pressing bolt is screwed in, the pressing bolt and the moving plate gradually rise. 2.3) After the pressing bolts are screwed in, remove the connecting bolts used to connect the moving plate and the bottom of the pressing bolts, and the overhead crane will move the pressing bolt removal and installation tools of the cold rolling leveling machine out of the work area.

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