A metal coil plate width setting slitting machine based on servo drive

Abstract

A kind of metal coiled plate fixed-width slitting machine based on servo drive belongs to the field of battery cabinet, to solve the problem that plate is immediately coiled after cutting, there is no secondary processing link, bubble is laminated after coiling with plate, permanent wrinkle or damage is formed, separation of film and base material is intensified, meanwhile, water, dust and corrosive medium are easily penetrated into the gap between bubbles, causing metal base material to rust, metal at incision is directly exposed due to film protection failure, corrosion and aging are accelerated, service life of coated metal plate is greatly shortened, and product qualification rate is reduced, a kind of metal coiled plate fixed-width slitting machine based on servo drive, including base, discharging roller fixedly connected on one side of base, cold air is used first to cool the bubble heated and expanded after cutting, and thermal expansion stress is eliminated;Then hot air is used to soften film body, and bubble is smoothly flattened and pasted under the premise of stable form, so that the effects of preventing bubble rebound and film surface wrinkle after pressing, and ensuring that the incision is coated flat and beautiful are achieved.

Description

Technical Field

[0001] This invention relates to the field of metal coil slitting machines, and particularly to a servo-driven metal coil fixed-width slitting machine. Background Technology

[0002] In the metal processing field, coated metal sheets are widely used in industries such as home appliances, construction, and packaging due to their combination of the high strength of the metal substrate and the decorative and corrosion-resistant properties of the PVC film on the surface. To meet dimensional requirements, coated metal coils need to be longitudinally slit using a fixed-width slitting machine. Currently, the mainstream equipment in industry is a servo-driven fixed-width slitting machine for metal coils. This equipment uses a servo motor for high-precision control to achieve synchronized control of the cutter shaft speed, feed speed, and winding speed, ensuring cutting accuracy. Its working principle is to pull the coil to the cutting area, where a servo motor drives a circular cutter to rotate at high speed for shearing, and then a winding device completes the processing loop.

[0003] However, this equipment faces key technical challenges when cutting coated metal sheets: the high-speed rotation of the circular blade causes intense friction between the metal substrate and the PVC film, and the plastic deformation of the metal during shearing generates a large amount of heat, forming localized high temperatures that are difficult to dissipate. The PVC film has poor heat resistance; once the temperature reaches its softening point, the air between the film and the substrate expands due to heat and cannot escape, causing the softened PVC film to rise and form bubbles, mainly distributed near the cut.

[0004] Because servo slitting machines operate continuously at high speeds, the cut sheets are immediately rolled up without secondary processing. Air bubbles are compressed as the sheets are rolled up, forming permanent wrinkles or damage, exacerbating the separation of the film from the substrate. Simultaneously, moisture, dust, and corrosive media can easily seep into the gaps between the air bubbles, causing corrosion of the metal substrate. The metal at the cut edges is also directly exposed due to the failure of the film protection, accelerating corrosion and aging, significantly shortening the service life of the coated metal sheets, and reducing the product yield.

[0005] Currently, the industry lacks an effective solution: while reducing cutting speed can decrease heat generation, it significantly reduces production efficiency; water or air cooling for circular cutters only targets the cutter body and cannot effectively reduce the high temperature on the PVC film surface, and the cooling water easily contaminates the film surface. Therefore, solving the problem of PVC film blistering caused by high temperatures during circular cutter cutting, which affects the service life of metal sheets, has become a pressing technical challenge for the industry, hindering the high-quality development of the coated metal sheet processing industry. Summary of the Invention

[0006] The purpose of this invention is to provide a servo-driven metal coil slitting machine for fixed width, which solves the problems of immediate coiling after cutting without secondary processing, resulting in air bubbles being compressed during coiling, forming permanent wrinkles or damage, and exacerbating the separation of the film from the substrate. Simultaneously, moisture, dust, and corrosive media can easily seep into the gaps between air bubbles, causing corrosion of the metal substrate. Furthermore, the metal at the cut edge is directly exposed due to the failure of the film protection, accelerating corrosion and aging, significantly shortening the service life of the coated metal sheet, and reducing the product qualification rate.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a servo-driven metal coil slitting machine with fixed width, comprising a base, a feeding roller fixedly connected to one side of the base, a receiving roller fixedly connected to the other side of the base, and a circular cutter disposed between the feeding roller and the receiving roller. A pushing mechanism is disposed between the receiving roller and the circular cutter. Two sets of pushing mechanisms are symmetrically arranged about the central axis of the base. An industrial hot air blower is disposed above the pushing mechanism, and a first push rod is disposed below the pushing mechanism. An extrusion mechanism is disposed on the side of the first push rod near the base. The pushing mechanism is used to drive the extrusion mechanism to move back and forth along the direction of movement of the coated metal sheet. The industrial hot air blower is used to alternately output cold air and hot air. First, the cold air is used to cool the bubbles that have expanded due to heat after cutting, eliminating thermal expansion stress. Then, the hot air is used to soften the film, flatten the bubbles, and prevent the bubbles from rebounding and wrinkling the film surface after pressing.

[0008] Preferably, the pushing mechanism includes a first support plate fixedly connected to the upper and lower sides of the base. An electric push rod is fixedly connected to one side of the top surface of the first support plate. A plurality of third push rods are fixedly connected to the output end of the electric push rod. A plurality of second support plates are fixedly connected to the other side of the top surface of the first support plate. A guide groove is provided on the side of the second support plate near the third push rod. A guide rod is provided on the inner side of the guide groove and is vertically slidably connected to the third push rod. The guide rod is fixedly connected to the first push rod. An air inlet pipe is fixedly connected to the side of the first push rod away from the receiving roller. The upper end of the air inlet pipe is connected to a flexible hose connected to the output end of an industrial hot air blower. The electric push rod is used to drive the third push rod and the guide rod to slide along the guide groove, thereby driving the first push rod and the extrusion mechanism to achieve horizontal and vertical movement.

[0009] Preferably, the guide groove has a downwardly inclined guide section at the end near the circular cutter, an upwardly inclined guide section at the end away from the circular cutter, and a horizontal straight section in the middle. When the guide rod slides along the guide groove, it drives the first push rod and the extrusion mechanism to move horizontally and simultaneously lift and lower, so that the extrusion mechanism descends to contact the surface of the coated metal plate after cutting, and rises and resets after processing.

[0010] Preferably, the feeding speed of the feeding roller is the same as the receiving speed of the receiving roller, and the speed at which the electric push rod moves toward the receiving roller is the same as the feeding speed of the feeding roller. This is to enable the extrusion mechanism to move synchronously with the cut coated metal sheet, avoid machine downtime, and improve production efficiency.

[0011] Preferably, the extrusion mechanism includes an outer pressure shell connected to the end of the air inlet pipe near the base, a first air guide plate is fixedly connected to the inner side of the outer pressure shell, a baffle is fixedly connected to the side of the outer pressure shell near the circular cutter and the side near the base, and an air guide pipe is fixed to the side of the outer pressure shell above the base near the receiving roller. The outer pressure shell is used to bond with the PVC film on the surface of the coated metal plate after descent to form an air cavity.

[0012] Preferably, the two ends of the first air guide plate along the feeding direction of the feeding roller are attached to the inner side of the outer pressure shell, and the width of the first air guide plate is smaller than the inner width of the outer pressure shell. The first air guide plate is used to split the airflow entering from the air inlet pipe into two streams, which are directed to the inner walls on both sides of the cut of the coated metal plate. After the two airflows collide at the cut, they form an airflow towards the receiving roller, which blows away the impurities at the cut.

[0013] Preferably, the width of the baffle is the same as the width of the circular cutter, and when the side of the outer pressure shell close to the base contacts the film-coated metal plate, the baffles on the upper and lower sides contact each other to restrict the airflow direction, so that the airflow can only move towards the inner wall of the cutting area and the receiving roller, concentrate the airflow energy, efficiently clean impurities and directionally push the film to bond.

[0014] Preferably, the central axis of the air guide duct is inclined to the lower surface of the outer pressure shell, and the lower end face of the air guide duct is closer to the receiving roller than the end face of the outer pressure shell that is closer to the receiving roller, so that the exhaust air is directed downward and blown away, reducing the re-contamination of the cleaned coated metal sheet.

[0015] Preferably, the industrial hot air blower outputs cold air when cleaning impurities, and the cold air cools the bubbles that have expanded due to heat after cutting, eliminates thermal expansion stress, and restores the warped film edge to a stiff and stable state. After the impurities are removed, the industrial hot air blower switches to hot air output. The hot air moves along the same path to soften the PVC film on the coated metal sheet and pushes the softened PVC film evenly towards the inner wall of the cut, so that the PVC film protrudes evenly and adheres to the outer side of the coated metal sheet, reducing the direct exposure of the coated metal sheet and improving its service life.

[0016] Preferably, PVC film protrusions are evenly distributed between the PVC films. The PVC film protrusions are used to fill the PVC film defects caused by the circular cutter under the push of hot air, and to compensate for the cutting defects by using the reserved amount.

[0017] 1. Compared with the prior art, the beneficial effects of the present invention are: the outer pressure shell and the first air guide plate are driven to move towards the cutting point by the symmetrically arranged pushing mechanism, the cold air is diverted and guided to the inner wall of the cutting point by the first air guide plate, and the two air streams collide at the cutting point to form an airflow towards the take-up roller, which blows away the impurities, thereby reducing the wear of the PVC film on the outer side of the coated metal plate by the impurities at the cutting point during the subsequent winding process.

[0018] 2. This invention keeps the feeding speed of the feeding roller, the receiving speed of the receiving roller, and the movement speed of the electric push rod toward the receiving roller consistent, so that the outer pressure shell and the first air guide plate can move synchronously with the film-coated metal plate being cut, thereby avoiding the stopping operation of the feeding roller, the receiving roller, and the circular cutter, and improving production efficiency.

[0019] 3. After cleaning impurities, the present invention uses an industrial hot air blower to heat the air. The hot air moves along the same path to soften the coated metal plate and evenly pushes the softened PVC film towards the inner wall of the cut, so that the PVC film protrudes and evenly adheres to the outer side of the coated metal plate, thereby reducing the direct exposure of the coated metal plate and improving its service life.

[0020] 4. The present invention uses PVC film protrusions evenly distributed between the PVC films. Under the push of hot air, the protrusions can fill the defects caused by the circular cutter taking away part of the PVC film, thereby achieving the effect of compensating for cutting defects by using the reserved amount.

[0021] 5. This invention first uses cold air to cool the bubbles that have expanded due to heat after cutting, eliminating thermal expansion stress and restoring the raised film edge to its stiffness and stability, thus avoiding wrinkling and curling. Then, hot air is used to soften the film, and the bubbles are smoothly pressed and flattened under the premise of stable shape. This achieves the effect of preventing the bubbles from rebounding and the film surface from wrinkling after pressing, and ensuring that the film covering at the cut is flat and beautiful.

[0022] 6. This invention achieves the effect of reducing impurities being covered inside the PVC film and increasing the service life of the PVC film on the inner wall of the cut area by first cleaning the impurities on the inner wall of the cut area and then covering the inner wall of the cut area with PVC film.

[0023] 7. The present invention uses an inclined downward air duct to guide the exhaust air downward, thereby reducing the re-contamination of the cleaned coated metal plate.

[0024] 8. In this invention, when the outer pressure shell comes into contact with the coated metal plate, the upper and lower baffles come into contact with each other and together with the first air guide plate, restrict the direction of airflow, so that the air can only move towards the inner wall of the cutting area and the direction of the receiving roller, thereby achieving the effects of concentrating airflow energy, efficiently cleaning impurities, and directionally promoting film bonding. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the first support plate of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the front cross-sectional structure of the flexible tube of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the left-side cross-sectional structure of the first air guide plate of the present invention; Figure 7 This is a schematic diagram of the front cross-sectional structure of the guide groove of the present invention.

[0026] In the diagram: 1. Base; 2. Feeding roller; 3. Receiving roller; 4. Circular cutter; 5. Pushing mechanism; 6. Industrial hot air blower; 7. First push rod; 8. Extrusion mechanism; 51. First support plate; 52. Electric push rod; 53. Third push rod; 54. Second support plate; 55. Guide groove; 56. Guide rod; 58. Air inlet pipe; 59. Hose; 510. Connecting plate; 81. Outer pressure shell; 82. First air guide plate; 83. Baffle; 84. Air guide pipe; 85. Coated metal plate; 86. PVC film; 87. PVC film protrusion. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-7 The present invention provides the following technical solutions: It should be noted that in this document, relational terms such as "first" and "second" refer only to the slitting machine body structure: The equipment includes a base 1 serving as the mounting base. A feed roller 2 is fixedly connected to the feed end of the base 1 for carrying and unwinding the coated metal sheet 85 into a roll. A take-up roller 3 is fixedly connected to the discharge end (right side) of the base 1 for rewinding the multiple narrow strips of sheet metal after slitting into a coil. A rotary circular cutter 4 is disposed between the feed roller 2 and the take-up roller 3. This cutter typically consists of a pair of upper and lower cutter shafts and a disc blade, used for longitudinal rolling slitting along the length of the sheet metal.

[0029] To ensure cutting accuracy and high-speed stable operation, this equipment adopts a full servo drive control scheme.

[0030] The feeding roller 2, the receiving roller 3, and the circular cutter 4 are each driven by an independent servo motor. The system uses a central controller to collect the speed, torque, and position feedback signals of each axis in real time and executes an electronic gear synchronization algorithm. Specifically, the linear velocity of the circular cutter 4 serves as the master axis command, while the servo motors of the feeding roller 2 and the receiving roller 3 act as slave axes, precisely following the linear velocity of the cutter according to a preset transmission ratio, forming a speed synchronization following system.

[0031] During the cutting process, to ensure the flatness of the sheet material and prevent deviation or stretching deformation caused by tension fluctuations, the servo motor of the take-up roller 3 operates in torque control mode. Based on parameters such as the damping of the feed roller 2, the width and thickness of the sheet material, the system calculates and applies a reverse torque in real time, thereby establishing and maintaining constant sheet material tension between the feed roller 2 and the take-up roller 3. After the circular cutter 4 cuts the sheet material into narrow strips with smaller widths, the servo motor of the take-up roller 3 automatically fine-tunes the rotation speed of each take-up shaft according to the principle of total cross-sectional area conservation (i.e., inlet width × thickness = sum of outlet width × thickness) to ensure balanced tension in each narrow strip.

[0032] The circular cutter 4's blade axis servo motor features high-precision positioning. It can electronically adjust the axial position of the upper and lower blade axes precisely according to the preset cutting width of the sheet material, achieving one-button width adjustment and avoiding the cumbersome operation of changing shims using traditional machinery. Simultaneously, the drive system can perform real-time position feedforward compensation to address positional errors caused by blade wear or uneven sheet material during cutting, ensuring clean, burr-free cut edges.

[0033] While the aforementioned servo drive system synchronously controls the high-speed operation of the feeding roller 2, circular cutter 4, and receiving roller 3, the pushing mechanism 5, industrial hot air blower 6, and extrusion mechanism 8, added in this invention, can then begin to operate. The specific collaborative relationships are as follows: By setting the servo drive system, the linear speeds of the feeding roller 2, the circular cutter 4, the receiving roller 3, and the electric push rod 52 moving towards the receiving roller 3 are kept consistent. This allows the extrusion mechanism 8 to remain relatively stationary with the sheet material being cut, completing the entire cooling-cleaning-heating-pressing process at the cutting position of the same section of sheet material without stopping the machine, achieving online real-time processing.

[0034] The servo drive system can send the real-time position and speed signals of the circular cutter 4 to the controller of the industrial hot air blower 6 and the electric push rod 52. For example, when the circular cutter 4 is detected to have completed a cut and reached the preset end point of the stroke, the system automatically starts the push mechanism 5 to descend and begins to output cold air; when the cooling cycle is completed, it automatically switches to hot air output.

[0035] Based on this, in order to solve the problem of PVC film bubbling caused by high temperature during cutting, the improved structure of the present invention is as follows: A first support plate 51 is fixedly connected to the base 1. An electric push rod 52 is fixedly connected to one side of the top surface of the first support plate 51, and multiple second support plates 54 are fixedly connected to the other side. A guide groove 55 is provided on the second support plate 54, and a guide rod 56 is slidably connected in the guide groove 55. The guide rod 56 is fixedly connected to the first push rod 7. An air inlet pipe 58 is fixedly connected to the side of the first push rod 7 away from the receiving roller 3. The upper end of the air inlet pipe 58 is connected to the output end of the industrial hot air blower 6 through a hose 59. A pressing mechanism 8 is provided on the side of the first push rod 7 near the base 1.

[0036] When cutting the coated metal sheet 85, the servo motor corresponding to the feeding roller 2 is first started to feed the sheet, the servo motor corresponding to the circular cutter 4 is started to cut the coated metal sheet 85, and the servo motor corresponding to the receiving roller 3 is started to collect the cut coated metal sheet 85. To ensure that the subsequent processing mechanism can follow the movement of the sheet without stopping, the servo drive system sets the feeding linear speed of the feeding roller 2 and the receiving linear speed of the receiving roller 3 to achieve precise synchronization, so as to maintain constant tension on the coated metal sheet 85. Considering that the width of the sheet decreases after cutting but the volume of the metal substrate remains unchanged, in order to ensure that the linear speed matches the feeding side, the linear speed of the receiving roller 3 is finely adjusted in real time by the servo system according to the ratio of the actual sheet width to the sheet width before cutting. Meanwhile, the linear velocity of the electric push rod 52 moving towards the take-up roller 3 is consistent with the linear velocity of the feed roller 2. In this way, the outer pressure shell 81 and the first air guide plate 82 can move synchronously with the cut coated metal plate 85, avoiding the stopping of the feed roller 2, take-up roller 3 and circular cutter 4, thereby improving production efficiency.

[0037] When cutting the coated metal sheet 85, the motor corresponding to the feeding roller 2 is first started to feed the material, the motor corresponding to the circular cutter 4 is started to cut the coated metal sheet 85, and the motor corresponding to the receiving roller 3 is started to collect the cut coated metal sheet 85. In order to ensure that the subsequent processing mechanism can follow the movement of the sheet without stopping, the feeding linear speed of the feeding roller 2 and the receiving linear speed of the receiving roller 3 are set to be synchronously controlled by the servo drive system to maintain constant tension on the coated metal sheet 85. Considering that the width of the sheet decreases after cutting but the volume of the metal substrate remains unchanged, the linear speed of the receiving roller can be finely adjusted according to the ratio of the actual sheet width to the sheet width before cutting. At the same time, the speed at which the electric push rod 52 moves towards the receiving roller 3 is consistent with the feeding linear speed of the feeding roller 2. In this way, the outer pressure shell 81 and the first air guide plate 82 can move synchronously with the coated metal sheet 85 being cut, avoiding the stopping operation of the feeding roller 2, the receiving roller 3 and the circular cutter 4, thereby improving production efficiency.

[0038] Next, the electric push rod 52 in the push mechanism 5 is activated. The electric push rod 52 is fixedly connected to one side of the top surface of the first support plate 51. The first support plate 51 is fixedly connected to the upper and lower sides of the base 1. The output end of the electric push rod 52 is fixedly connected to the connecting plate 510. Multiple third push rods 53 are fixedly connected to the connecting plate 510. The multiple third push rods 53 achieve synchronous movement through the connecting plate. The third push rod 53 has a vertical waist-shaped hole, and the guide rod 56 is slidably fitted in the vertical waist-shaped hole. The guide rod 56 is opened inside the guide groove 55 on the side of the second support plate 54 near the third push rod 53. The second support plate 54 is fixedly connected to the other side of the top surface of the first support plate 51. The guide rod 56 is fixedly connected to the first push rod 7. The side of the first push rod 7 away from the receiving roller 3 is fixedly connected to the air inlet pipe 58. The upper end of the air inlet pipe 58 is connected to the output end of the industrial hot air blower 6 through the hose 59. When the electric push rod 52 pushes the third push rod 53 and the guide rod 56 to move along the guide groove 55 towards the circular cutter 4, the guide rod 56 drives the first push rod 7, the air inlet pipe 58, the outer pressure shell 81 and the first air guide plate 82 to move together towards the side of the circular cutter 4.

[0039] The specific trajectory of the guide groove 55 is as follows: point a is set on the outer side of the end near the circular cutter 4, and point b is set on the inner side; point c is set on the outer side of the end away from the circular cutter 4, and point d is set on the inner side. The horizontal height of point a is lower than that of point b, and the horizontal height of point c is higher than that of point d. The upper and lower ends of the middle of the guide groove 55 are horizontal straight lines, and the inclination angle of the inclined section is 5° to 30°. The length of the horizontal section is set according to the cutting length of the coated metal plate 85. When the guide rod 56 moves to the position of point a, since point a is lower than point b, the guide rod 56 is guided to the lower inner side of the guide groove 55, so that the first push rod 7, the air inlet pipe 58, the outer pressure shell 81 and the first air guide plate 82 descend towards the side of the just-cut coated metal plate 85. At this time, all surfaces of the lower surface of the outer pressure shell 81 are on the same surface, so the outer pressure shell 81 can be tightly attached to the outer side of the PVC film 86 on the surface of the coated metal plate 85.

[0040] During the bonding process, the industrial hot air blower 6 starts working, but its inner heating wire does not heat the film. Therefore, the air entering the air inlet pipe 58 from the hose 59 is cooling air at a temperature 20-30°C lower than the softening point of the PVC film, for example, 10-30°C. The PVC film thickness is typically 0.1-0.3mm, with a small heat conduction time constant (approximately 0.1 seconds). Combined with a 10-20cm long air-cooling section, it can fully cool the air bubbles under the film during continuous movement, causing the air volume inside the bubbles to shrink and the internal pressure to decrease. After the cold air enters the air inlet pipe 58, it encounters the first air guide plate 82. The first air guide plate 82 is fixedly connected to the inner side of the outer pressure shell 81, and its external structure is rectangular, with its central axis aligned with the air inlet pipe 58. With the central axes parallel, the two end faces of the first air guide plate 82 along the feeding direction of the feeding roller 2 are attached to the inner side of the outer pressure shell 81, and the width of the first air guide plate 82 is smaller than the inner width of the outer pressure shell 81. Therefore, the cold air is diverted by the first air guide plate 82 and moves from the two side gaps between the first air guide plate 82 and the outer pressure shell 81 to the PVC film 86. By designing the distance between the first air guide plate 82 and the outer pressure shell 81 to be greater than the distance between the first air guide plate 82 and the film-coated metal plate 85, when the airflow enters the distance from the first air guide plate 82 to the film-coated metal plate 85, the air pressure can fill this space, and bubbles can be formed in the hot air because the cold air is diverted by the first air guide plate 82.

[0041] Two streams of cold air blow simultaneously onto the surface of the PVC film 86. Since there is equal force of airflow on both the upper and lower sides of the coated metal plate 85, the cold air can only move along the coated metal plate 85 towards the cut. The two streams of air collide at the cut point of the coated metal plate 85. At this time, a baffle 83 is fixedly connected to the side of the outer pressure shell 81 near the circular cutter 4 and the side near the base 1. The width of the baffle 83 is the same as the width of the circular cutter 4. When the outer pressure shell 81 contacts the coated metal plate 85, a small gap of 0.1–0.5 mm is maintained between the upper and lower baffles 83, or they are in contact but the baffles are made of flexible, wear-resistant materials such as polytetrafluoroethylene (PTFE). Made of heat-resistant rubber, the edges that contact the cut surface of the coated metal plate are rounded or chamfered. At the same time, the pushing mechanism 5 is symmetrically arranged in two sets about the central axis of the base 1. These structures together restrict the airflow direction: the upward direction is limited by the first air guide plate 82, and the lateral directions are blocked by the baffles 83. Therefore, the airflow after the collision can only move towards the inner wall of the cut of the coated metal plate 85, and finally can only move towards the direction close to the take-up roller 3. In this way, a wind is formed on the inner wall of the cut that moves towards the take-up roller 3, blowing away the impurities on the inner wall of the cut, reducing the risk of impurities falling and abrading the PVC film 86 during the subsequent winding process.

[0042] An air guide pipe 84 is fixed on the side of the outer pressure shell 81 above the base 1 near the take-up roller 3. The central axis of the air guide pipe 84 is inclined to the lower surface of the outer pressure shell 81, and the lower end face of the air guide pipe 84 is closer to the take-up roller 3 than the end face of the outer pressure shell 81 near the take-up roller 3. This allows the excess airflow discharged from the air cavity after the PVC film 86 has been pushed to be guided in an oblique downward direction, avoiding turbulence that disturbs the treated area and continuing to push the softened PVC film to be laminated.

[0043] After the impurities at the cut of the coated metal plate 85 are cleaned, the heating wire inside the industrial hot air blower 6 heats the air to a temperature slightly above the softening point, such as 70-90°C. The hot air temperature, wind speed, and action time are set according to the fluidity of the PVC film material, typically with a wind speed of 5-15 m / s and an action time of 1-3 seconds. Under these parameters, the softened PVC film has moderate fluidity and will not scatter or tear, allowing the hot air to move along the same path as the cold air. The hot air softens the PVC film 86 and evenly pushes the softened PVC film 86 towards the cut. Since the airflow direction is limited by the above structure, the hot air can only move towards the inner wall of the cut, thereby causing the softened PVC film 86 to adhere to the inner wall of the cut, so that the PVC film 86 evenly covers the outer side of the cut of the coated metal plate 85. This device reduces the direct exposure of the coated metal plate 85, thus improving its service life. Because impurities are cleaned before the PVC film is applied, the risk of impurities being trapped inside the film is reduced, further extending the service life of the PVC film 86 on the inner wall of the cut. This device addresses the issues of uneven PVC film coverage and the inability of the PVC film 86 to completely cover the coated metal plate 85. Even though the cooling-to-reheating process is extremely uneconomical in terms of energy utilization, and the cyclic heating-cooling may lead to thermal fatigue and accelerated aging of the PVC film, uneven PVC film coverage and the inability of the PVC film 86 to completely cover the coated metal plate 85 will only make the PVC film 86 more prone to warping and shortening its service life. The coated metal plate 85 will be more likely to come into contact with impurities, leading to faster rusting and a shorter service life.

[0044] Furthermore, when the coated metal plate 85 is cut, not only will it generate bubbles due to thermal expansion, but the circular cutter 4 will also remove part of the PVC film 86. Even if the normal bubbles are smoothed out, some defects will remain. This invention first uses cold air to contact the PVC film 86 to cool the bubbles that have expanded due to heat after cutting, so that the surface temperature of the PVC film drops rapidly below the softening point. The air volume inside the bubbles shrinks, the internal pressure decreases, and the film returns to a glassy and stiff state, avoiding wrinkling and curling of the film layer due to overheating and excessive softening. Then, hot air is used to soften the film edge, which can smoothly press and flatten the bubbles under the premise of stable film shape, effectively preventing the bubbles from rebounding and the film surface from wrinkling after pressing, ensuring that the coating at the cut is flat and beautiful. At the same time, the PVC film 86 is a specially produced coating material with tiny PVC film protrusions 87 continuously or equidistantly distributed along the length direction on its surface. The height of the protrusions is 0.05 to 0.2 mm, and the width is 1 to 1.5 times the thickness of the cutter. Because the extrusion mechanism 8 moves synchronously with the sheet material, and the hot air acts continuously along the entire cutting length, the softened PVC film protrusions 87 flow along the cutting surface under the influence of the airflow and evenly cover the defective area, eliminating the need for precise alignment between the protrusions and defects. These protrusions act as a reserve, filling the PVC film defects caused by the circular cutter 4 under the push of the hot air, ensuring that the cut coated metal sheet 85 can be completely covered, further improving its service life.

[0045] After cleaning and bonding are completed, the electric push rod 52 drives the guide rod 56 to move in the opposite direction along the guide groove 55. When the guide rod 56 moves to point c, since the horizontal height of point c is higher than that of point d, the guide rod 56 is guided to rise and reset, which drives the first push rod 7 and the extrusion mechanism 8 to detach from the surface of the coated metal plate 85. Then the electric push rod 52 moves towards the feeding roller 2 at a speed faster than the feeding speed, ready for the next round of processing, thereby realizing continuous operation.

[0046] The term "comprising" is used to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between those entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A servo-driven metal coil slitting machine for fixed width, comprising a base (1), a feeding roller (2) fixedly connected to one side of the base (1), a receiving roller (3) fixedly connected to the other side of the base (1), and a circular cutter (4) disposed between the feeding roller (2) and the receiving roller (3), characterized in that, A pushing mechanism (5) is provided between the receiving roller (3) and the circular cutter (4). Two sets of the pushing mechanism (5) are symmetrically arranged about the central axis of the base (1). An industrial hot air blower (6) is provided above the pushing mechanism (5). A first push rod (7) is provided below the pushing mechanism (5). An extrusion mechanism (8) is provided on the side of the first push rod (7) near the base (1). The first push rod (7) is fixedly connected to an air inlet pipe (58) on the side away from the receiving roller (3), and the upper end of the air inlet pipe (58) is connected to a hose (59) that is connected to the output end of the industrial hot air blower (6). The extrusion mechanism (8) includes an outer pressure shell (81) connected to the end of the air inlet pipe (58) near the base (1). A first air guide plate (82) is fixedly connected to the inner side of the outer pressure shell (81). A baffle (83) is fixedly connected to the side of the outer pressure shell (81) near the circular cutter (4) and the side of the outer pressure shell (81) near the base (1). An air guide pipe (84) is fixed to the side of the outer pressure shell (81) above the base (1) near the receiving roller (3). The outer pressure shell (81) is used to adhere to the PVC film (86) on the surface of the coated metal plate (85) after descent to form an air cavity; The pushing mechanism (5) is used to drive the extrusion mechanism (8) to move back and forth along the direction of movement of the coated metal plate (85). The industrial hot air blower (6) is used to alternately output cold air and hot air. First, the cold air is used to cool the bubbles that have expanded after cutting and eliminate thermal expansion stress. Then, the hot air is used to soften the film and flatten the bubbles to prevent the bubbles from rebounding and wrinkling the film surface after pressing.

2. The servo-driven metal coil slitting machine according to claim 1, characterized in that, The pushing mechanism (5) includes a first support plate (51) fixedly connected to the upper and lower sides of the base (1). An electric push rod (52) is fixedly connected to one side of the top surface of the first support plate (51). A connecting plate (510) is fixedly connected to the output end of the electric push rod (52). A plurality of third push rods (53) are fixedly connected to the connecting plate (510). A plurality of second support plates (54) are fixedly connected to the other side of the top surface of the first support plate (51). A guide groove (55) is provided on one side of the second support plate (54) near the third push rod (53). A guide rod (56) is provided on the inner side of the guide groove (55) and is vertically slidably connected to the third push rod (53). A sliding groove is provided on the third push rod (53). The guide rod (56) is inserted into the sliding groove and can slide up and down along the sliding groove. The guide rod (56) is fixedly connected to the first push rod (7). The electric push rod (52) is used to drive the third push rod (53) and the guide rod (56) to slide along the guide groove (55), thereby driving the first push rod (7) and the extrusion mechanism (8) to achieve horizontal movement and lifting motion.

3. A servo-driven metal coil slitting machine for fixed width as described in claim 2, characterized in that, The guide groove (55) has a downwardly inclined guide section at one end near the circular cutter (4) and an upwardly inclined guide section at the other end away from the circular cutter (4). The middle section is a horizontal straight line. The inclination angle of the inclined section of the guide groove (55) is 5° to 30°. The length of the horizontal section is set according to the cutting length of the coated metal plate (85). The total stroke of the guide groove (55) and the length of the inclined section are matched with the thickness of the coated metal plate and the cutting position size. When the guide rod (56) slides along the guide groove (55), it drives the first push rod (7) and the extrusion mechanism (8) to move horizontally and simultaneously lift and lower, so that the extrusion mechanism (8) descends to contact the surface of the coated metal plate (85) after cutting and rises and resets after processing.

4. A servo-driven metal coil slitting machine for fixed width as described in claim 2, characterized in that, The feeding roller (2), the receiving roller (3), and the circular cutter (4) are each equipped with an independent servo motor; The slitting machine adopts a servo drive system. The servo drive system uses the linear speed of the circular cutter (4) as the main shaft command. The servo motors of the feeding roller (2) and the receiving roller (3) accurately follow the linear speed of the circular cutter (4) according to the preset transmission ratio, so as to realize the synchronous speed of the feeding roller (2), the receiving roller (3) and the circular cutter (4). The servo drive system collects the speed, torque and position feedback signals of each axis in real time through the central controller; The servo motor of the receiving roller (3) adopts torque control mode, which can output reverse torque in real time according to the plate parameters to maintain constant tension of the plate, and can automatically adjust its own speed according to the principle of total cross-sectional area conservation; the servo motor of the circular cutter (4) can electronically adjust the axial position of the cutter shaft and can realize real-time position feedforward compensation. The feeding linear speed of the feeding roller (2), the receiving linear speed of the receiving roller (3), the linear speed of the circular cutter (4), and the linear speed of the electric push rod (52) moving toward the receiving roller (3) are kept consistent. The linear speed of the receiving roller (3) can be finely adjusted according to the width ratio of the plate before and after cutting in order to maintain constant tension; The servo drive system collects the real-time position and speed signals of the circular cutter (4) and transmits these signals to the controllers of the industrial hot air blower (6) and the electric push rod (52) to achieve the linkage control of the whole machine.

5. A servo-driven metal coil width-fixed slitting machine according to claim 1, characterized in that, The two ends of the first air guide plate (82) along the feeding direction of the feeding roller (2) are in contact with the inner side of the outer pressure shell (81), and the width of the first air guide plate (82) is smaller than the inner width of the outer pressure shell (81); The first air guide plate (82) is used to split the airflow entering from the air inlet pipe (58) into two streams, which are respectively guided to the inner walls on both sides of the cut of the coated metal plate (85). After the two streams collide at the cut, they form an airflow towards the receiving roller (3) to blow away the impurities at the cut.

6. A servo-driven metal coil slitting machine for fixed width as described in claim 1, characterized in that, The width of the baffle (83) is the same as the width of the circular cutter (4). When the side of the outer pressure shell (81) close to the base (1) contacts the film-coated metal plate (85), a small gap of 0.1 to 0.5 mm is maintained between the baffles (83) on the upper and lower sides, or they are in contact with each other but the baffles are made of flexible wear-resistant material and the edges that contact the cutting surface of the film-coated metal plate are rounded to restrict the direction of airflow, so that the airflow can only move towards the inner wall of the cutting area and the receiving roller (3), concentrate the airflow energy, efficiently clean impurities and directionally push the film to adhere.

7. A servo-driven metal coil width-fixed slitting machine according to claim 1, characterized in that, The central axis of the air guide duct (84) is inclined to the lower surface of the outer pressure shell (81), and the lower end face of the air guide duct (84) is closer to the receiving roller (3) than the end face of the outer pressure shell (81) that is closer to the receiving roller (3). This is to guide the excess airflow discharged from the air cavity to the downward direction, so as to avoid turbulence disturbing the processed area, while the main airflow still flows horizontally along the cutting surface towards the receiving roller, continuing to push the softened PVC film to bond.

8. A servo-driven metal coil slitting machine for fixed width as described in claim 1, characterized in that, The industrial hot air blower (6) outputs cooling air at a temperature 20-30°C lower than the softening point of the PVC film when cleaning impurities. The cold air rapidly cools the bubbles that have expanded due to heat after cutting, causing the surface temperature of the PVC film to drop rapidly below the softening point. The air volume inside the bubbles shrinks, the internal pressure decreases, and the film returns to its glassy and stiff state. After the impurities are cleaned, the industrial hot air blower (6) switches to hot air output slightly above the softening point. The hot air moves along the same path to soften the PVC film (86) of the coated metal plate (85) and pushes the softened PVC film evenly toward the inner wall of the cut, so that the softened PVC film is evenly attached to the outer side of the coated metal plate (85).

9. A servo-driven metal coil slitting machine for fixed width as described in claim 8, characterized in that, The PVC film (86) is a special coating material produced by customization. Its surface has tiny PVC film protrusions (87) continuously or equidistantly distributed along the length direction. The height of the protrusions is 0.05 to 0.2 mm, and the width is 1 to 1.5 times the thickness of the cutter.

Images