Automatic tape threading method for preventing sewing head from scratching roller surface

Abstract

The invention provides an automatic strip threading method for preventing a sewing head from scratching a roller surface, which is used in the production process of a stretch bending and straightening unit of a strip, and comprises the following steps of: when a sewing machine of the stretch bending and straightening unit is used for sewing a coiled material, positioning a sewing area of a strip tail of a previous roll and a strip head of a next roll; setting a stitching machine pressing stitching operation instruction of the stitching machine as a stitching head identification signal; when the sewing head formed by sewing treatment enters the threading process, the threading process related machine column equipment controls the roller equipment executing the lifting action according to the sewing head identification signal, so that the roller equipment executing the lifting action automatically lifts the roller part before the sewing head passes through the position of the roller part of the roller equipment; after passing through the position, the sewing head automatically falls down and returns and is pressed on the surface of the strip again, so that roller surface damage caused by high-pressure extrusion on the sewing head is avoided; the surface of the rubber roller can be prevented from being scratched, and the strip surface quality can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of processing and manufacturing aluminum alloy strips, in particular to an automatic strip threading method for preventing a stitching head from scratching a roller surface. Background Art

[0002] During the production process of the aluminum strip bending and straightening unit, in order to ensure continuous production, the tail of the previous roll and the head of the next roll will be stitched together in the stitching machine mechanism. The stitching head will move to the coiler in a jog motion according to the machine train threading instruction. Because the bending and straightening system has multiple sets of pinch rollers and squeeze rollers, which press on the surface of the strip during the production process, the pinch rollers and squeeze rollers need to be lifted up during threading. If they are not lifted up, the sharp edges of the stitching mouth (such as Figure 1 ) may scratch the surface of the rubber roller (such as Figure 2 ), resulting in strip quality defects, and the manual operation of lifting and lowering the pinch rollers and squeeze rollers is inefficient and may result in misoperation. Summary of the invention

[0003] The present invention provides an automatic belt threading method which can avoid the stitching head from scratching the roller surface, thereby avoiding scratching the rubber roller surface and being beneficial to improving the surface quality of the belt.

[0004] The present invention adopts the following technical solutions.

[0005] An automatic tape threading method for preventing a stitching head from scratching a roller surface is used in a production process of a strip drawing, bending and straightening machine group. The method positions the stitching area of ​​the tail of the previous roll and the head of the next roll when a stitching machine of the strip drawing, bending and straightening machine group performs stitching processing on the coiled material, and sets the stitching machine downward stitching operation instruction of the stitching machine to a stitching head identification signal; when the stitching head formed by the stitching processing enters the tape threading process, the relevant machine series equipment of the tape threading process controls the roller equipment that performs the lifting action according to the stitching head identification signal, so that the roller equipment that performs the lifting action automatically lifts the roller component before the stitching head passes through its roller component position, and automatically falls back and presses on the strip surface again after the stitching head passes through its position, so as to avoid high-pressure extrusion of the stitching head with a sharp edge to cause damage to the roller surface.

[0006] During the belt threading process of the tension and bending straightening machine group, the roller equipment that performs the lifting and lowering action includes a pinch roller mechanism, a squeeze roller mechanism, and a straightening machine mechanism, and the corresponding roller components include a squeeze roller and a pinch roller.

[0007] The strip is an aluminum strip. After leaving the stitching machine A, the stitching head enters the strip cleaning process of the threading process. The strip cleaning process includes a high-pressure cleaning process, an alkali cleaning process, and a water washing process. In each strip cleaning process, a squeezing roller is used to apply pressure to the strip surface to squeeze the strip surface to avoid color difference on the strip surface.

[0008] The method comprises the following steps: Step S1: suture head identification; Step S2: Calculation of the movement stroke of the suture head; Step S3: Identify the position of the suture head in the tape threading area: Step S4: The suture head passes through the roller conveyor of the cleaning process area of ​​the machine train (such as Figure 5 ) action logic execution; Step S5: The suture head passes through the bending and straightening unit of the machine train (such as Figure 7 ) action logic execution: Step S6: The action is executed when the sewing head runs to the exit shearing area of ​​the machine train.

[0009] The specific method of step S1 is as follows: during the production process, the tail of the previous roll of aluminum sheet strip and the head of the next roll are synchronously moved in the winding direction. When the tail of the previous roll and the head of the next roll reach the position of the stitching machine, the stitching machine is operated to perform the stitching action. The stitching machine (such as Figure 3 ) The upper and lower hydraulic cylinders move towards each other, pushing the pressure plate and the cutter. When the pressure plate contacts the strip, the spring contracts and the upper and lower cutters squeeze alternately, so that the tail strip and the head strip are interlaced and hinged together to form a stitching head; When the sewing machine is operating to perform the sewing action, the sewing machine press-down sewing operation instruction is set as the sewing head identification signal, and the background of the A area on the device HMI is green, indicating that the sewing head identification is successful (the sewing machine press-down action is executed once, and the sewing head signal M150.0 is set to 1). The logic is as follows Figure 4 .

[0010] The specific method of step S2 is: the sewing head runs toward the direction of the winder according to the machine train threading instruction, and when the machine train threading speed is greater than 0 (threading speed is 20 meters per minute) and the sewing signal is 1, the time accumulation begins; the accumulated value is X; In order to calculate more accurately, the 100mS clock in the PLC of the machine control module is used for accumulation, and the sewing head signal M150.0 is 1 and the threading speed is greater than 0. A counter is used to send an accumulation signal to the accumulated value X every 100mS, and the time t=X / 10 is used for calculation; Suture head running speed v = V / 60v is the unit threading running speed, unit m / min, V is the sewing head running speed, unit m / s; The actual running stroke of the suture head is L=v*t, where L is in m.

[0011] In step S3, the area from the stitching machine to the exit shear position of the machine train is defined as the threading interval. In this interval, if the distance between a certain squeeze roller and the stitching machine in the strip travel route is L1, then the position N meters before and after L1 (each area is defined according to the actual situation) belongs to the squeeze roller area. When the running stroke of the strip stitching head L>L1-N meters and L<L1+N meters, it is determined that the stitching head runs to the position of the squeeze roller area. The threading interval is divided into 15 small intervals of AP. When the suture head falls within any interval of AP, the background board of the HMI display turns green. Taking the 2# squeeze roller area as an example, the 2# squeeze roller is located along the strip travel route at a distance of L1 from the stitching machine position. The position 2 meters before and after L1 (each area defines the front and rear range based on actual conditions) belongs to the 2# squeeze roller area. When the strip stitching head travels L>L1-2 meters and L<L1+2 meters, the 2# squeeze roller area E area is displayed in green on the HMI background panel of the operation screen to prompt the operator.

[0012] Step S4: The logic of the action related to the sewing head entering the cleaning roller is specifically executed as follows: if the sewing head is in a certain squeeze roller area, and the position of a certain squeeze roller in the strip travel route is L1 away from the position of the sewing machine, the program determines that the running stroke L of the sewing head is within a distance range of greater than or equal to L1-N and less than or equal to L1+N. At this time, the deflection roller under the strip rotates with the strip threading speed, and the cylinder solenoid valve loses power to lift the squeeze roller to avoid the sharp edge of the sewing head from being squeezed between the squeeze roller and the deflection roller. When the running stroke L of the strip is greater than L1+N meters, it is determined that the sewing head has walked out of the squeeze roller area, the cylinder solenoid valve is energized, and the squeeze roller is pressed down; Use the sewing head in the 2# squeeze roller area (such as Figure 6 ) as an example, the program determines that the running stroke L of the sewing head is in the range of (L1-2, L1+2). At this time, the deflector roller under the strip still rotates with the strip threading speed, the cylinder solenoid valve loses power, and the squeeze roller is lifted to prevent the sharp edge of the sewing head from being squeezed between the squeeze roller and the deflector roller. When the running stroke L of the strip is greater than L1+2 meters, that is, it goes out of this area, the cylinder solenoid valve is energized and the squeeze roller is pressed down.

[0013] In step S5, when the sewing head passes through the stretching and straightening unit, in the belt threading mode, the elongation tension roller group is not put into the tension roller group inlet and the tension roller group outlet to prevent the sewing head from strangling the roller surface of the elongation tension roller group; when the sewing head passes through the stretching and straightening unit, the upper groups of roller straightening systems are lifted up to avoid contact with the sewing head and to avoid scratching the straightening rollers of the roller straightening system.

[0014] In step S6, when the sewing head runs to the exit cutting area, the machine is stopped to cut the sewing head, and the sewing head signal is reset (M150.0 is 0) to complete the tracking of the sewing head of the roll.

[0015] The present invention increases the tracking of the stitching head signal and realizes the automatic lifting and lowering of the pressing roller, squeezing roller, straightening machine and other mechanisms after recognizing the stitching head signal through programming, which can protect the roller surface safety of the equipment, avoid manual operation and improve production efficiency. It has been well applied on site.

[0016] The present invention prevents the roller surface of the equipment from being damaged by the sewing head by allowing the pressing roller, the squeezing roller and the straightening machine to automatically avoid the sewing head. Therefore, the roller surface of the pressing roller, the squeezing roller and the straightening machine can perform better process processing on the strip during the pressing, squeezing and straightening processes, thereby improving the quality of the strip and also being beneficial to the service life of the roller surface of the pressing roller, the squeezing roller and the straightening machine.

[0017] The purpose of the present invention is to provide a method for automatically threading aluminum strips, by positioning and tracking the stitching head, automatically lifting the stitching head before it enters the positions of a squeeze roller, a pinch roller, etc.; and automatically dropping the stitching head after it passes the positions of a squeeze roller, a pinch roller, etc., to avoid the roller surface squeezing the stitching head and causing damage to the roller surface, thereby improving equipment safety and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 is a schematic diagram of a suture head sample; Attached Figure 2 It is a schematic diagram of the roller surface scratch; Attached Figure 3 It is a schematic diagram of automatic tracking of strips in the machine train (the corresponding relationship of the letters in the table in the figure is A: stitching machine B: flattening roller; C: tensioning roller; D: 1# squeeze roller; E: 2# squeeze roller; F: 4# squeeze roller; G: 6# squeeze roller; H: 8# squeeze roller; I: 10# squeeze roller; J: double deviation correction roller; K: tension roller group entrance; L: straightening unit; M: tension roller group exit; N: pinch roller; O: exit shear; P: exit guide roller); Attached Figure 4 It is a schematic diagram of a stitching machine in the machine train; Attached Figure 5 It is a flow logic diagram of the suture head identification process; Attached Figure 6 This is a schematic diagram of the roller conveyor in the cleaning area of ​​the machine train (for Figure 3 ); Attached Figure 7 It is a schematic diagram of the squeeze roller in the machine train; Attached Figure 8 This is a schematic diagram of the bending and straightening unit in the machine train (for Figure 3 ). DETAILED DESCRIPTION

[0019] This example adopts the following technical solutions: 1. Sewing head identification signal. When the sewing machine sews the tail of the previous roll and the head of the next roll, the sewing machine presses down the sewing operation instruction and sets the sewing head identification signal at the same time. The signal is always in the set state during the threading process. When the sewing head runs to the exit shear for cutting, the sewing head identification signal is reset.

[0020] Automatic tracking of the suture head is achieved through programming, and the position of the suture head is displayed on the operating screen HMI. When there are downward pressing mechanisms such as pinch rollers, squeeze rollers, and straighteners in the area where the suture head is located, such mechanisms are automatically lifted up. When the suture head completely passes through the downward pressing mechanisms such as pinch rollers, squeeze rollers, and straighteners, such mechanisms are automatically pressed down.

[0021] As shown in the figure, an automatic tape threading method for avoiding scratches on the roller surface by the sewing head is used in the production process of the strip drawing, bending and straightening machine unit. The method locates the sewing area of ​​the tail of the previous roll and the head of the next roll when the sewing machine of the stretching, bending and straightening machine unit is sewing the coiled material, and sets the sewing machine downward sewing operation instruction of the sewing machine to the sewing head identification signal; when the sewing head formed by the sewing process enters the tape threading process, the relevant machine series equipment of the tape threading process controls the roller equipment that performs the lifting action according to the sewing head identification signal, so that the roller equipment that performs the lifting action automatically lifts the roller component before the sewing head passes through its roller component position, and automatically falls back and presses on the strip surface again after the sewing head passes through its position, so as to avoid high-pressure extrusion of the sewing head with sharp edges to cause damage to the roller surface.

[0022] During the belt threading process of the tension and bending straightening machine group, the roller equipment that performs the lifting and lowering action includes a pinch roller mechanism, a squeeze roller mechanism, and a straightening machine mechanism, and the corresponding roller components include a squeeze roller and a pinch roller.

[0023] The strip is an aluminum strip. After leaving the stitching machine A, the stitching head enters the strip cleaning process of the threading process. The strip cleaning process includes a high-pressure cleaning process, an alkali cleaning process, and a water washing process. In each strip cleaning process, a squeezing roller is used to apply pressure to the strip surface to squeeze the strip surface to avoid color difference on the strip surface.

[0024] The method comprises the following steps: Step S1: suture head identification; Step S2: Calculation of the movement stroke of the suture head; Step S3: Identify the position of the suture head in the tape threading area: Step S4: The suture head passes through the roller conveyor of the cleaning process area of ​​the machine train (such as Figure 5 ) action logic execution; Step S5: The suture head passes through the bending and straightening unit of the machine train (such as Figure 7 ) action logic execution: Step S6: The action is executed when the sewing head runs to the exit shearing area of ​​the machine train.

[0025] The specific method of step S1 is as follows: during the production process, the tail of the previous roll of aluminum sheet strip and the head of the next roll are synchronously moved in the winding direction. When the tail of the previous roll and the head of the next roll reach the position of the stitching machine, the stitching machine is operated to perform the stitching action. The stitching machine (such as Figure 3 ) The upper and lower hydraulic cylinders move towards each other, pushing the pressure plate and the cutter. When the pressure plate contacts the strip, the spring contracts and the upper and lower cutters squeeze alternately, so that the tail strip and the head strip are interlaced and hinged together to form a stitching head; When the sewing machine is operating to perform the sewing action, the sewing machine press-down sewing operation instruction is set as the sewing head identification signal, and the background of the A area on the device HMI is green, indicating that the sewing head identification is successful (the sewing machine press-down action is executed once, and the sewing head signal M150.0 is set to 1). The logic is as follows Figure 4 .

[0026] The specific method of step S2 is: the sewing head runs toward the direction of the winder according to the machine train threading instruction, and when the machine train threading speed is greater than 0 (threading speed is 20 meters per minute) and the sewing signal is 1, the time accumulation begins; the accumulated value is X; In order to calculate more accurately, the 100mS clock in the PLC of the machine control module is used for accumulation, and the sewing head signal M150.0 is 1 and the threading speed is greater than 0. A counter is used to send an accumulation signal to the accumulated value X every 100mS, and the time t=X / 10 is used for calculation; Suture head running speed v = V / 60v is the unit threading running speed, unit m / min, V is the sewing head running speed, unit m / s; The actual running stroke of the suture head is L=v*t, where L is in m.

[0027] In step S3, the area from the stitching machine to the exit shear position of the machine train is defined as the threading interval. In this interval, if the distance between a certain squeeze roller and the stitching machine in the strip travel route is L1, then the position N meters before and after L1 (each area is defined according to the actual situation) belongs to the squeeze roller area. When the running stroke of the strip stitching head L>L1-N meters and L<L1+N meters, it is determined that the stitching head runs to the position of the squeeze roller area. The threading interval is divided into 15 small intervals of AP. When the suture head falls within any interval of AP, the background board of the HMI display turns green. Taking the 2# squeeze roller area as an example, the 2# squeeze roller is located along the strip travel route at a distance of L1 from the stitching machine position. The position 2 meters before and after L1 (each area defines the front and rear range based on actual conditions) belongs to the 2# squeeze roller area. When the strip stitching head travels L>L1-2 meters and L<L1+2 meters, the 2# squeeze roller area E area is displayed in green on the HMI background panel of the operation screen to prompt the operator.

[0028] Step S4: The logic of the action related to the sewing head entering the cleaning roller is specifically executed as follows: if the sewing head is in a certain squeeze roller area, and the position of a certain squeeze roller in the strip travel route is L1 away from the position of the sewing machine, the program determines that the running stroke L of the sewing head is within a distance range of greater than or equal to L1-N and less than or equal to L1+N. At this time, the deflection roller under the strip rotates with the strip threading speed, and the cylinder solenoid valve loses power to lift the squeeze roller to avoid the sharp edge of the sewing head from being squeezed between the squeeze roller and the deflection roller. When the running stroke L of the strip is greater than L1+N meters, it is determined that the sewing head has walked out of the squeeze roller area, the cylinder solenoid valve is energized, and the squeeze roller is pressed down; Use the sewing head in the 2# squeeze roller area (such as Figure 6 ) as an example, the program determines that the running stroke L of the sewing head is in the range of (L1-2, L1+2). At this time, the deflector roller under the strip still rotates with the strip threading speed, the cylinder solenoid valve loses power, and the squeeze roller is lifted to prevent the sharp edge of the sewing head from being squeezed between the squeeze roller and the deflector roller. When the running stroke L of the strip is greater than L1+2 meters, that is, it goes out of this area, the cylinder solenoid valve is energized and the squeeze roller is pressed down.

[0029] In step S5, when the sewing head passes through the stretching, bending and straightening unit, in the belt threading mode, no elongation is applied to the inlet and outlet of the tension roller group, and the strip has no large tensile force, that is, the elongation tension roller group is not applied to avoid the sewing head from strangling the roller surface of the elongation tension roller group; at the same time, when the sewing head passes through the stretching, bending and straightening unit, the upper groups of roller straightening systems are lifted to avoid contact with the sewing head and scratching the straightening rollers.

[0030] The stretch and straightening unit is one of the core components of the stretch and straightening machine. It consists of 8 tension rollers and 5 groups of roller levelers to achieve strip stretching and straightening. During the normal startup process, this section needs to put the 4 rollers at the inlet of the elongation tension roller group into use to exert force in the unwinding direction and the 4 rollers at the outlet into use to exert force in the winding direction, and the strip is subjected to a large tensile force.

[0031] In step S6, when the sewing head runs to the exit cutting area, the machine is stopped to cut the sewing head, and the sewing head signal is reset (M150.0 is 0) to complete the tracking of the sewing head of the roll.

[0032] This embodiment adds suture head signal tracking to the tension and bending straightening, and realizes automatic lifting and lowering of the pressing roller, squeezing roller, straightening machine and other mechanisms after recognizing the suture head signal through programming, thereby protecting the roller surface of the equipment, avoiding manual operation and improving production efficiency. It has been well applied on site.

[0033] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An automatic belt threading method to avoid scratches on the roller surface caused by the stitching head, used in the production process of the belt bending and straightening unit, characterized in that: The method locates the stitching area of ​​the tail of the previous roll and the head of the next roll when the stitching machine of the stretching and bending straightening machine group stitches the coiled material, and sets the stitching machine downward pressing stitching operation instruction of the stitching machine as the stitching head identification signal; when the stitching head formed by the stitching process enters the threading process, the machine series equipment related to the threading process controls the roller equipment that performs the lifting action according to the stitching head identification signal, so that the roller equipment that performs the lifting action automatically lifts the roller component before the stitching head passes through the position of its roller component, and automatically falls back and presses on the surface of the strip after the stitching head passes through its position, so as to avoid high-pressure extrusion of the stitching head and cause damage to the roller surface.

2. The automatic threading method for preventing the sewing head from scratching the roller surface according to claim 1, characterized in that: During the belt threading process of the tension and bending straightening machine group, the roller equipment that performs the lifting and lowering action includes a pinch roller mechanism, a squeeze roller mechanism, and a straightening machine mechanism, and the corresponding roller components include a squeeze roller and a pinch roller.

3. The automatic threading method for preventing the sewing head from scratching the roller surface according to claim 2, characterized in that: The strip is an aluminum strip. After leaving the stitching machine A, the stitching head enters the strip cleaning process of the threading process. The strip cleaning process includes a high-pressure cleaning process, an alkali cleaning process, and a water washing process. In each strip cleaning process, a squeezing roller is used to apply pressure to the strip surface to squeeze the strip surface to avoid color difference on the strip surface.

4. The automatic threading method for preventing the sewing head from scratching the roller surface according to claim 3, characterized in that: The method comprises the following steps: Step S1: suture head identification; Step S2: Calculation of the movement stroke of the suture head; Step S3: Identify the position of the suture head in the tape threading area: Step S4: The action logic of the suture head passing through the roller of the cleaning process area of ​​the machine train is executed; Step S5: The action logic of the sewing head passing through the bending and straightening unit of the machine train is executed: Step S6: The action is executed when the sewing head runs to the exit shearing area of ​​the machine train.

5. The automatic threading method for preventing the sewing head from scratching the roller surface according to claim 4, characterized in that: The specific method of step S1 is: during the production process, the tail of the previous roll of aluminum sheet and the head of the next roll are synchronously moved in the winding direction. When the tail of the previous roll and the head of the next roll reach the stitching machine position, the stitching machine is operated to perform the stitching action. The upper and lower groups of hydraulic cylinders of the stitching machine move toward each other to push the pressure plate and the tool. When the strip is contacted, the pressure plate retreats as the spring contracts, and the upper and lower tools are squeezed alternately, so that the tail strip and the head strip are staggered and hinged together to form a stitching head.

6. The automatic threading method for preventing the sewing head from scratching the roller surface according to claim 5, characterized in that: The specific method of step S2 is: the sewing head runs toward the winder according to the machine train threading instruction, and when the machine train threading speed is greater than 0 and there is a sewing signal, the time accumulation begins; the accumulated value is X; Suture head running speed v = V / 60v is the unit threading running speed, unit m / min, V is the sewing head running speed, unit m / s; The actual running stroke of the suture head is L=v*t, where L is in m.

7. The automatic tape threading method for preventing the sewing head from scratching the roller surface according to claim 6, characterized in that: In step S3, the area of ​​the machine train from the stitching machine to the exit shear position is defined as the belt threading interval. In this interval, if the distance between a certain squeezing roller and the stitching machine position in the belt travel route is L1, then the position N meters before and after L1 belongs to the squeezing roller area. When the running stroke of the belt stitching head L>L1-N meters and L<L1+N meters, it is determined that the stitching head has run to the position of the squeezing roller area.

8. The automatic tape threading method for preventing the sewing head from scratching the roller surface according to claim 7, characterized in that: In step S4, the logic execution of the relevant actions of the sewing head entering the cleaning roller is as follows: if the sewing head is in a certain squeezing roller area, the position of a certain squeezing roller in the strip travel route is L1 away from the position of the sewing machine, and the program determines that the running stroke L of the sewing head is within a distance range greater than or equal to L1-N and less than or equal to L1+N. At this time, the deflector roller under the strip rotates with the strip threading speed, and the cylinder solenoid valve loses power to lift the squeezing roller to avoid the sharp edge of the sewing head from being squeezed between the squeezing roller and the deflector roller. When the strip running stroke L is greater than L1+N meters, it is determined that the sewing head has walked out of the squeezing roller area, the cylinder solenoid valve is energized, and the squeezing roller is pressed down.

9. The automatic tape threading method for preventing the sewing head from scratching the roller surface according to claim 8, characterized in that: In step S5, when the sewing head passes through the stretching and straightening unit, in the belt threading mode, the elongation tension roller group is not put into the tension roller group inlet and the tension roller group outlet to prevent the sewing head from strangling the roller surface of the elongation tension roller group; when the sewing head passes through the stretching and straightening unit, the upper groups of roller straightening systems are lifted up to avoid contact with the sewing head and to avoid scratching the straightening rollers of the roller straightening system.

10. The automatic tape threading method for preventing the sewing head from scratching the roller surface according to claim 9, characterized in that: In step S6, when the sewing head runs to the exit cutting area, the sewing head is stopped and cut, and the sewing head signal is reset at the same time to complete the tracking of the sewing head of the roll.

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