An aluminum strip coater that automatically adjusts the spray range and position

Abstract

An aluminum strip coating machine capable of automatically adjusting the coating range and position, comprising a pair of extrusion coating rollers and guide rollers, a detection mechanism above the guide rollers for detecting the width and position of the aluminum strip, two nozzle supports above the extrusion coating rollers and longitudinally distributed along the extrusion coating rollers, a plurality of coating nozzles on each nozzle support and spaced along the length of the nozzle support, the position between the two outermost coating nozzles on the two nozzle supports forming the coating spraying range, the two nozzle supports being able to be linked with the detection mechanism and being able to adjust the position of the two nozzle supports along the longitudinal direction of the extrusion coating rollers and the staggered amplitude between the two nozzle supports according to the width and position of the aluminum strip detected by the detection mechanism, so that the width and position of the coating spraying range are consistent with the aluminum strip. The present application can improve the color difference problem of aluminum strip printing and dyeing, and automatically adjust the coating spraying range, so that the coating spraying range is self-adaptive to the width and position of the feeding aluminum strip.

Description

Technical Field

[0001] This invention relates to the field of automatic coating feeding for metal sheet / strip coating machines, specifically an aluminum strip coating machine that automatically adjusts the spraying range and position. Background Technology

[0002] Existing aluminum strip coating machines typically consist of two paired extrusion coating rollers and multiple guide rollers located in front of them. The gap between the two extrusion coating rollers forms an extrusion coating channel. After the aluminum strip is fed into the extrusion channel by the guide rollers, the coating is distributed onto the surface of the aluminum strip by the extrusion coating rollers. The conventional method for feeding coating into these machines is as follows: a feed pump directly delivers liquid coating to the extrusion coating rollers, where the coating is distributed onto the surface of the rollers by the pressure of the two rollers. The pressure from the rollers then forces the coating into contact with the aluminum strip for printing and coloring.

[0003] The existing aluminum strip coating machines and coating supply methods have the following problems: the coating is directly pumped onto a localized area of ​​the coating roller, easily resulting in uneven coating distribution and inconsistent coating thickness, directly causing color differences on the surface of the strip and sheet. To solve this technical problem, the applicant improved the coating supply method by installing multiple coating nozzles above the extrusion coating roller. The spacing between two nozzles on the end corresponds to the width of the aluminum strip. The coating is evenly sprayed onto the extrusion coating roller or aluminum strip through the nozzles. After being squeezed by the extrusion coating roller, the aluminum strip is printed and colored evenly, and the color difference is significantly reduced. However, in actual production, the same aluminum strip coating machine often needs to process aluminum strips of different widths. Although the aluminum strip is required to be fed in a centered manner relative to the extrusion coating roller and guide roller, in actual operation, the aluminum strip often deviates from the center of the extrusion coating roller and guide roller. As a result, the fixedly set coating nozzles cannot adapt to the coating needs of aluminum strips of different widths and positions. Summary of the Invention

[0004] The present invention aims to provide an aluminum strip coating machine that automatically adjusts the spraying range and position. Compared with the feeding method of directly conveying liquid coating to the extrusion coating roller through a feed pump, it can improve the color difference problem of aluminum strip printing and dyeing, and can automatically adjust the coating spraying range so that the coating spraying range adapts to the width and position of the feeding aluminum strip.

[0005] To solve the above technical problems, the specific solution adopted by the present invention is as follows: an aluminum strip coating machine that automatically adjusts the spraying range and position, comprising paired extrusion coating rollers and several guide rollers located in front of the extrusion coating rollers. A detection mechanism for detecting the width and position of the aluminum strip is provided above the guide rollers. Two nozzle supports are provided above the extrusion coating rollers, which are distributed longitudinally along the extrusion coating rollers. Multiple coating nozzles are spaced apart along their own length on each nozzle support. The position between the two outermost coating nozzles on the two nozzle supports forms the coating spraying range. The two nozzle supports can be linked with the detection mechanism and can adjust the position of the two nozzles along the longitudinal direction of the extrusion coating rollers and the staggered amplitude between the two nozzle supports according to the width and position of the aluminum strip measured by the detection mechanism, so that the width and position of the coating spraying range are consistent with the aluminum strip.

[0006] Preferably, the detection mechanism includes a detection slide bar distributed longitudinally along the guide roller, two positioning sensors slidably disposed on the detection slide bar, and a first driving member for driving the positioning sensors to slide along the detection slide bar;

[0007] The nozzle bracket is slidably mounted on the nozzle slide plate distributed along the longitudinal direction of the extrusion coating roller, and the nozzle slide plate is provided with a second driving component for driving the nozzle bracket to slide along the nozzle slide plate.

[0008] Preferably, the positioning sensor, the first driving component, and the second driving component are all signal-connected to the controller. The controller is used to control the two positioning sensors to move from the guide roller end towards the center of the aluminum strip through the first driving component, and after receiving the signal from the positioning sensor that the aluminum strip edge is detected, it controls the two nozzle supports to move respectively through the second driving component, so as to adjust the position of the two nozzle supports along the longitudinal direction of the extrusion coating roller and the stagger between the two nozzle supports, so that the width and position of the coating spraying range are consistent with the aluminum strip.

[0009] Preferably, a lead screw nut is fixed on both the positioning sensor and the nozzle bracket. The first driving component is a first lead screw that is installed in conjunction with the corresponding lead screw nut and a first motor for driving the first lead screw to rotate. The second driving component is a second lead screw that is installed in conjunction with the corresponding lead screw nut and a second motor for driving the second lead screw to rotate.

[0010] Preferably, the two outermost paint nozzles correspond to the two positioning sensors along the transverse direction of the paint extrusion roller and the guide roller. Nuts are fixed on both the positioning sensors and the nozzle brackets. The first driving component includes a first lead screw that is installed in cooperation with the corresponding nut, and the second driving component includes a second lead screw that is installed in cooperation with the corresponding nut. A set of first and second lead screws on the same side are connected to the same third motor, and the moving direction and speed of the nozzle brackets and positioning sensors on the same side driven by the third motor through the first and second lead screws are the same.

[0011] Preferably, each nozzle bracket has a paint tube connected to a paint nozzle within the same nozzle bracket. The two nozzle brackets are staggered. On the front nozzle bracket, near the center of the extrusion paint roller, multiple paint nozzles and their corresponding paint tubes are equipped with switching valves. Each switching valve includes a valve housing and a valve core rotatably disposed within the valve housing. The valve housing has a first channel connected to the paint tube and a second channel connected to the corresponding paint nozzle. The valve core has an internal channel that connects the first and second channels. A valve stem is also fixedly connected to the valve core. The valve stem extends from the front nozzle bracket and is fixedly connected to a drive plate. The drive plate is located on the movement trajectory of the rear nozzle bracket and can be touched and rotated by the rear nozzle bracket to close the connection between the first and second channels. A return torsion spring is also provided between the valve stem and the nozzle bracket. The return torsion spring is used to control the valve core to reset after the rear nozzle bracket is moved away, so as to reconnect the first and second channels.

[0012] Preferably, the valve body is cylindrical, the valve core is cylindrical, and the internal channel is T-shaped.

[0013] Preferably, the paint nozzles on the two nozzle supports are equidistantly distributed. The positional relationship of the two paint nozzles on the outer nozzle support and the inner nozzle support that are closest to the middle of the extrusion paint roller is set such that, during the staggered movement of the two nozzle supports, after the rear nozzle support closes the paint nozzle on the front nozzle support that is closest to the middle of the extrusion paint roller, the paint nozzle on the rear nozzle support that is closest to the middle of the extrusion paint roller coincides with the closed paint nozzle.

[0014] This invention uses multiple paint nozzles to evenly spray paint onto an aluminum strip or an extrusion paint roller, so that the aluminum strip is ignited and colored evenly after being squeezed by the extrusion paint roller, which greatly improves the color difference problem.

[0015] This invention includes a detection mechanism and two movable nozzle supports. The two nozzle supports can adjust their positions according to the width and position of the aluminum strip on the guide roller measured by the detection mechanism, so that the paint spraying range formed between the two paint nozzles on the outermost side of the two nozzle supports corresponds to the width and position of the aluminum strip. This ensures that the paint spraying range precisely covers the aluminum strip, avoiding waste caused by excessive spraying, or situations where the paint spraying range is too small or the paint spraying range and the position of the aluminum strip are misaligned, resulting in localized areas of the aluminum strip that cannot be properly printed and colored.

[0016] In a preferred embodiment of the present invention, the detection mechanism and the two nozzle supports located on the same side are driven by the same motor. On the one hand, this makes the structure of the present invention simple, easy to implement and maintain. On the other hand, it enables the detection mechanism and the nozzle supports to move synchronously, at the same speed and in the same direction, so that the nozzle supports are in place in a timely manner and ensure that the nozzle supports are accurately moved into place.

[0017] In a further preferred embodiment of the present invention, during the staggered movement of the two nozzle supports, the portion of the paint nozzles located on the front nozzle support and overlapping with the rear nozzle support can be automatically closed by the rear nozzle support, and paint is sprayed only through the overlapping portion of the paint nozzles on the rear nozzle support. This avoids uneven paint distribution and color difference caused by excessive spraying of the overlapping portion of the two nozzle supports, and also avoids paint waste caused by repeated spraying. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure and initial state of an aluminum strip coating machine that automatically adjusts the spraying range and position according to Embodiment 1 of the present invention;

[0019] Figure 2 for Figure 1 A top view of the structure after the nozzle slide plate has been removed;

[0020] Figure 3 This is a top view of the two nozzle support sections in Example 1;

[0021] Figure 4 for Figure 3 Sectional view along line AA in the middle;

[0022] Figure 5 for Figure 4 A schematic diagram showing the state of the two nozzle supports after they have been moved relative to each other by one distance.

[0023] Figure 6 for Figure 4 A schematic diagram of the right-side side view structure;

[0024] Figure 7 Figure 2 The diagram shown illustrates the state of aluminum strip coating production in Example 1.

[0025] Figure 8 This is a top view of an aluminum strip coating machine that automatically adjusts the spraying range and position according to Embodiment 2 of the present invention.

[0026] The diagram shows the following markings: 1. Extrusion roller, 2. Nozzle bracket, 3. Second lead screw, 4. Nozzle slide plate, 5. Sensor bracket, 6. First lead screw, 7. Detection slide bar, 8. Position sensor, 9. Aluminum strip, 10. Guide roller, 11. Paint nozzle, 12. Second motor, 13. First motor, 14. Bearing housing, 15. First driven pulley, 16. Transmission belt, 17. Third motor, 18. Drive pulley, 19. Second driven pulley, 20. Switch valve, 2001. Valve core, 2002. Valve housing, 2003. Drive plate, 2004. Valve stem, 2005. Return torsion spring, 2006. First channel, 2007. Second channel, 2008. Internal channel, 21. Paint tube. Detailed Implementation

[0027] The technical solution of the present invention will be described below through two embodiments:

[0028] Example 1

[0029] Combination Figure 1 and Figure 2 As shown in this embodiment, an aluminum strip coating machine for automatically adjusting the spraying range and position has two extrusion coating rollers 1 and multiple guide rollers 10 arranged in front of the extrusion coating rollers 1. The extrusion coating rollers 1 and the guide rollers 10 are distributed horizontally and arranged parallel to each other. The two extrusion coating rollers 1 are arranged in pairs, one above the other, with a small gap forming an extrusion channel. The aluminum sheet is coated along the guide rollers 10 with the assistance of the guide rollers 10. Figure 1 After entering the extrusion channel from right to left, the coating on the aluminum strip 9 is flattened and evenly colored by the extrusion coating roller 1, completing the coating process of the aluminum strip 9. Unlike the existing coating method of spraying coating onto the extrusion coating roller 1, this embodiment uses a coating nozzle 11 to spray coating onto the aluminum strip 9. The coating spraying range formed by the coating nozzle 11 can be quickly adjusted according to the actual width and position of the aluminum strip 9 on the guide roller 10. This ensures that the aluminum strip 9 can be completely coated and avoids coating waste caused by spraying beyond the width of the aluminum strip 9.

[0030] To achieve the above technical effects, this embodiment includes a detection mechanism for online detection of the width of the aluminum strip 9 and two nozzle supports 2. The two nozzles are parallel to the extrusion coating roller 1 and are staggered. Each coating roller has multiple coating nozzles 11 evenly spaced along its length. The coating nozzles 11 are vertically downwards and used to spray coating onto the aluminum strip 9. It should be noted that... Figure 2 In the top view, no paint nozzles 11 should appear due to obstruction; however, to clearly show the paint spraying area, they are specifically shown in [the image / view]. Figure 2 The projections of the two outermost paint nozzles 11 are labeled. Figure 2The paint spraying area is formed between the two outermost paint nozzles 11. The width and position of this paint spraying area can be adjusted by a detection mechanism and by driving the two nozzle supports 2 to correspond to the width and position of the aluminum strip 9. Specifically:

[0031] The detection mechanism mainly includes two positioning sensors 8 for detecting the positions of the two sides of the aluminum strip 9 in the width direction. The two positioning sensors 8 are respectively fixed on corresponding sensor brackets 5. A horizontally distributed detection slide rod 7, which is slidably engaged with the sensor bracket 5, is provided between the two guide rollers 10. A first lead screw 6, driven by a first motor 13, is provided on both sides of the detection slide rod 7. One end of the first lead screw 6 is connected to the first motor 13, and the other end is provided with rotational support by a bearing seat 14 located in the middle of the detection slide rod 7. The lead screw part is fitted with a nut on the sensor bracket 5, so that the two first motors 13 can drive the corresponding positioning sensors 8 along the width direction. Figure 2 Slide left and right in the middle.

[0032] like Figure 1 As shown, the detection direction of the position sensor 8 is distributed vertically downwards. It should be noted that: Figure 2 Position sensor 8 should not appear in the top view, but to clearly show the specific location of position sensor 8, it is shown here. Figure 2 The projection of the positioning sensor 8 is marked. In the initial state, the two positioning sensors 8 are located on the end sides of the guide roller 10, and correspond one-to-one with the positions of the two outermost paint nozzles 11 in the initial state. At this time, the detection range of the positioning sensor 8 is within the gap between the two guide rollers 10, and no positioning information is generated due to the lack of obstruction. When a detection task is required, the two first motors 13 drive the corresponding positioning sensor 8 to move towards the middle of the guide roller 10. When it moves to the side of the corresponding aluminum strip 9, the aluminum strip 9 creates an obstruction and the positioning sensor 8 generates a positioning signal. Thus, after both positioning sensors 8 generate positioning signals, the width and position information of the aluminum strip 9 can be determined.

[0033] In this embodiment, the positioning sensor 8 is a conventional infrared sensor used in the field of automation control. In other embodiments, sensors with similar functions, such as proximity switches and infrared rangefinders, can also be used to achieve the same technical effect. In this embodiment, the two positioning sensors 8 are initially symmetrically distributed on the end sides of the guide roller 10. During the detection process, the positioning sensors 8 are moved by two first motors 13. The two positioning sensors 8 detect corresponding sides of the aluminum strip 9 without interfering with each other, thus adapting to... Figure 2 The diagram shows a common production situation where the aluminum strip 9 is not centered on the guide roller 10.

[0034] Two nozzle supports 2 are slidably mounted at the bottom of a nozzle slide plate 4 via a dovetail-shaped groove-slider structure. One is the rear nozzle support 2 near the extrusion paint roller 1, and the other is the front nozzle support 2 near the guide roller 10. Each nozzle support 2 has a paint pipe 21 connecting all paint nozzles 11 within the same nozzle support 2. The paint pipe 21 is also connected to a paint tank via a paint pump, thus distributing paint to each paint nozzle 11 through the paint pipe 21 under the action of the paint pump, and then uniformly spraying the paint onto the aluminum strip 9 through the paint nozzles 11. Similar to the aforementioned sensor support 5, the nozzle support 2 also has a lead screw nut, which is installed in conjunction with a second lead screw 3. The second lead screw 3 is driven to rotate by a second motor 12, thereby enabling the second motor 12 to drive the nozzle support 2 along... Figure 2 The nozzle moves left and right, thereby adjusting the width and position of the paint spraying area by driving the two nozzle supports 2 to move a specific distance.

[0035] In this embodiment, the second motor 12, the aforementioned position sensor 8, and the first motor 13 are all signal-connected to the same controller. The controller's function is to calculate the moving distance of the two position sensors 8 after the first motor 13 drives the position sensor 8 to move from the end of the guide roller 10 towards the center, until the position sensor 8 detects the side of the aluminum strip 9. Then, it controls the second motor 12 to drive the two nozzle supports 2 to move the same distance as the position sensors 8 on the same side, thus ensuring that the nozzle supports 2 and the paint nozzles 11 on them are in the correct position. Figure 7 As shown, this allows for adjustment of the width and position of the paint spraying area between the two outermost paint nozzles 11, ensuring consistency with the width and position of the aluminum strip 9.

[0036] During the adjustment of the paint spraying range, the two spraying supports often overlap and intersect. To avoid paint waste and color difference caused by overspraying of the two sets of paint nozzles 11 at the overlapping positions on the two nozzle supports 2, in this embodiment, during the movement of the two nozzle supports 2, the rear nozzle support 2 automatically closes part of the paint nozzles 11 at the corresponding overlapping positions on the front nozzle support 2. Specifically:

[0037] Combination Figure 3 , 4As shown in Figures 6 and 7, the nozzle support 2 in this embodiment is a long rectangular box. All paint nozzles 11 located between the rear nozzles are directly connected to the paint pipe 21, and paint is sprayed only through the paint pump controller. A switching valve 20 is provided between all or near the left end of the paint nozzles 11 located in the front nozzle support 2 and the paint pipe 21. Even when the paint pump is on, the switching valve 20 must be opened for paint spraying. The switching valve 20 includes a cylindrical valve housing 2002 and a cylindrical valve core 2001 rotatably disposed within the valve housing 2002. Both ends of the valve housing 2002 are closed and fixedly connected to the front and rear side walls of the nozzle support 2. A first channel 2006 for connecting to the paint pipe 21 is opened on the side of the valve housing 2002, and a second channel 2007 for connecting to the corresponding paint nozzle 11 is opened at the bottom of the valve housing 2002. Figure 4 As shown, the valve core 2001 has an internal channel 2008 with a T-shaped cross-section. The side of the internal channel 2008 is used to connect to the first channel 2006, and the bottom is used to connect to the second channel 2007, thereby maintaining the normal flow between the corresponding paint nozzle 11 and the paint pipe 21. A valve stem 2004 is fixedly mounted on the back side of the valve core 2001. The valve stem 2004 extends through the rear side wall of the rear nozzle bracket 2 and is fixed with a vertically distributed drive plate 2003, such as... Figure 6 As shown, the drive plate 2003 is located on the moving trajectory of the rear nozzle bracket 2 under the drive of the second motor 12. Therefore, during the aforementioned adjustment of the paint spraying range, when the two nozzle brackets 2 move relative to each other, the rear nozzle bracket 2 can push the drive plate 2003 to rotate to about 90°, and drive the valve core 2001 to rotate by the corresponding angle via the valve rod 2004, so that the switch valve 20 of the overlapping part of the two nozzle brackets 2 is in a position... Figure 5 In the state shown, the two switch valves 20 of the overlapping part of the front nozzle bracket 2 are closed, and the two corresponding paint nozzles 11 cannot spray paint; while the paint nozzles 11 of the overlapping part of the rear nozzle bracket 2 still spray paint normally, and the two sets of nozzles can also be completely overlapped due to their setting position, so that all paint nozzles 11 that can spray paint are still evenly spaced along the longitudinal direction of the extrusion paint roller 1, which is conducive to maintaining the low color difference technical effect of this embodiment.

[0038] In addition, such as Figure 3 and 6As shown, a torsion spring is also sleeved on the valve stem 2004 between the drive plate 2003 and the rear side wall of the nozzle bracket 2. In its natural state, the torsion spring maintains the drive plate 2003 on the moving trajectory of the rear nozzle bracket 2, and deforms during the rotation of the drive plate 2003 by the rear nozzle bracket 2. After the coating production of a batch of aluminum strip 9 is completed, the reset position sensor 8 and the two nozzle brackets 2 are reset to their initial positions, and then the reset torsion spring 2005 drives the valve core 2001 to rotate, resetting the closed switch valve 20 to its initial normally open state.

[0039] Example 2

[0040] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 lies only in the linkage method of the detection mechanism and the two nozzle supports 2. Compared with the linkage method of Embodiment 1, which is based on the detection mechanism recording, calculating, and controlling the movement of the two nozzle supports 2 through a controller, the structure of this embodiment is simpler, more efficient, faster, more accurate, and more stable.

[0041] In this embodiment, the first lead screw 6 and the second lead screw 3 have the same specifications, and the nuts on the sensor bracket 5 and the nozzle bracket 2 are also the same. The first lead screw 6 and the second lead screw 3 are respectively equipped with identical first driven pulleys 15 and 19. The first driven pulleys 15 and 19, located on the same side, are respectively connected to the driving pulley 18 on the output shaft of a third motor 17 via a transmission belt 16. Through the above linkage connection, in Figure 8 In the indicated state, as the two position sensors 8 are driven by the third motor 17 to move from the guide shaft end towards the center, the nozzle bracket 2 on the same side as the position sensors 8 also moves synchronously. When the position sensor 8 detects the side of the aluminum strip 9, the controller stops the third motor 17 from continuing to output, and the nozzle bracket 2 on the same side also stops moving synchronously. At this time, the moving distance of the nozzle bracket 2 and the position sensor 8 is consistent, and the width and position of the paint spraying formed between the two outermost paint nozzles 11 are exactly consistent with the width and position of the aluminum strip 9, that is, the paint spraying operation can begin.

Claims

1. An aluminum strip coating machine that automatically adjusts the spraying range and position, comprising paired extrusion coating rollers (1) and a plurality of guide rollers (10) located in front of the extrusion coating rollers (1), characterized in that: A detection mechanism for detecting the width and position of aluminum strip (9) is provided above the guide roller (10). Two nozzle supports (2) are provided above the extrusion coating roller (1) along the longitudinal direction of the extrusion coating roller (1). Multiple coating nozzles (11) are spaced apart on each nozzle support (2) along its own length direction. The position between the two outermost coating nozzles (11) on the two nozzle supports (2) forms the coating spraying range. The two nozzle supports (2) can be linked with the detection mechanism and can adjust the position of the two nozzle supports (2) along the longitudinal direction of the extrusion coating roller (1) and the staggered amplitude between the two nozzle supports (2) according to the width and position of aluminum strip (9) measured by the detection mechanism, so that the width and position of the coating spraying range are consistent with the aluminum strip (9). Each nozzle bracket (2) is provided with a paint tube (21) connecting a paint nozzle (11) within the same nozzle bracket (2). The two nozzle brackets (2) are staggered. On the nozzle bracket (2) located on the front side, multiple paint nozzles (11) near the middle of the extrusion paint roller (1) are provided with a switch valve (20) between them and the corresponding paint tube (21). The switch valve (20) includes a valve housing (2002) and a valve core (2001) rotatably disposed in the valve housing (2002). The valve housing (2002) is provided with a first channel (2006) connected to the paint tube (21) and a second channel (2007) connected to the corresponding paint nozzle (11). The valve core (2001) is provided with a valve core (2006) that can connect the first channel (2006) and the second channel (2007). The internal channel (2008) of 07) has a valve stem (2004) fixedly connected to the valve core (2001). The valve stem (2004) passes through the front nozzle bracket (2) and is fixedly connected to the drive plate (2003). The drive plate (2003) is located on the movement trajectory of the rear nozzle bracket (2) and can be touched and rotated by the rear nozzle bracket (2) to close the connection between the first channel (2006) and the second channel (2007). A reset torsion spring (2005) is also provided between the valve stem (2004) and the nozzle bracket (2). The reset torsion spring (2005) is used to control the valve core (2001) to reset after the rear nozzle bracket (2) is moved away so as to reconnect the first channel (2006) and the second channel (2007).

2. The aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 1, characterized in that: The detection mechanism includes a detection slide bar (7) distributed longitudinally along the guide roller (10), two position sensors (8) slidably disposed on the detection slide bar (7), and a first driving member for driving the position sensors (8) to slide along the detection slide bar (7); The nozzle bracket (2) is slidably mounted on the nozzle slide plate (4) which is distributed longitudinally along the extrusion coating roller (1). The nozzle slide plate (4) is provided with a second driving member for driving the nozzle bracket (2) to slide along the nozzle slide plate (4).

3. The aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 2, characterized in that: The position sensor (8), the first drive unit, and the second drive unit are all connected to the controller. The controller is used to control the two position sensors (8) to move from the end of the guide roller (10) toward the middle of the aluminum strip (9) through the first drive unit. After receiving the signal from the position sensor (8) that the edge of the aluminum strip (9) is detected, the controller controls the two nozzle supports (2) to move respectively through the second drive unit to adjust the position of the two nozzle supports (2) along the longitudinal direction of the extrusion coating roller (1) and the staggered amplitude between the two nozzle supports (2), so that the width and position of the coating spraying range are consistent with the aluminum strip (9).

4. The aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 3, characterized in that: Both the positioning sensor (8) and the nozzle bracket (2) are fixed with a screw nut. The first driving component is a first screw (6) that is installed in cooperation with the corresponding screw nut and a first motor (13) for driving the first screw (6) to rotate. The second driving component is a second screw (3) that is installed in cooperation with the corresponding screw nut and a second motor (12) for driving the second screw (3) to rotate.

5. An aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 2, characterized in that: The two outermost paint nozzles (11) correspond to the two position sensors (8) along the transverse direction of the extrusion paint roller (1) and the guide roller (10). The position sensors (8) and the nozzle bracket (2) are both fixed with nuts. The first driving component includes a first screw (6) that is installed in cooperation with the corresponding nut. The second driving component includes a second screw (3) that is installed in cooperation with the corresponding nut. A set of first screws (6) and second screws (3) on the same side are connected to the same third motor (17). The nozzle bracket (2) and the position sensor (8) on the same side driven by the third motor (17) via the first screws (6) and the second screws (3) have the same moving direction and speed.

6. The aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 1, characterized in that: The valve body (2002) is cylindrical, the valve core (2001) is cylindrical, and the internal channel (2008) is T-shaped.

7. The aluminum strip coating machine for automatically adjusting the spraying range and position as described in claim 1, characterized in that: The paint nozzles (11) on the two nozzle supports (2) are evenly distributed. The positional relationship of the two paint nozzles (11) on the outer nozzle support (2) and the inner nozzle support (2) that are closest to the middle of the extrusion paint roller (1) is set such that when the two nozzle supports (2) move alternately, after the rear nozzle support (2) closes the paint nozzle (11) on the front nozzle support (2) that is closest to the middle of the extrusion paint roller (1), the paint nozzle (11) on the rear nozzle support (2) that is closest to the middle of the extrusion paint roller (1) coincides with the closed paint nozzle (11).

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