Anti-curvature flattening device in reel paperboard unwinding and slitting process and control system of anti-curvature flattening device

Abstract

The invention provides an inflection flattening device in the reel paperboard unwinding and slitting process and a control system of the inflection flattening device, and relates to the technical field of printing, the device comprises an unwinding mechanism and a transverse cutting mechanism, and an inflection flattening mechanism and a paper curling angle detection mechanism are arranged between the unwinding mechanism and the transverse cutting mechanism; the control system comprises an adjusting unit (16), a detection unit (17) and a control feedback unit (18). The control feedback unit (18) carries out calculation and comparison according to the detection condition of the detection unit (17), judges whether the adjusting unit (16) needs to carry out shape righting or not and the shape righting direction and degree, and then sends out an instruction; then the unwound paper is subjected to shape righting adjustment according to the instruction requirement; then the paper is rechecked, and whether correction continues or not is determined; according to the invention, online real-time detection can be realized, a result can be quickly fed back, shape correction is controlled, and stable quality of a product is ensured.

Description

Technical Field

[0001] This invention relates to the field of printing technology, specifically to a flattening device and its control system for the unwinding and slitting process of roll paper. Background Technology

[0002] The outer packaging of general industrial products mainly uses various types of cardboard. After printing, the roll of cardboard needs to be rewound and slit or cut into individual sheets. Under normal circumstances, because cardboard is relatively thick, it can quickly spring back after a short period of bending deformation. However, after processes such as printing and hot stamping, the paper absorbs moisture and solvents on one side and is rolled into a coil. After a long period of rolling, the paper will undergo plastic deformation. The individual sheets obtained after slitting will be curved, affecting the paper feeding accuracy during die-cutting, and may even cause paper jams and equipment downtime. It will also seriously affect subsequent processing steps such as transfer and packaging.

[0003] To address the problem of paper curling during the unwinding and slitting process of packaging paper, especially cardboard rolls, existing solutions can be divided into two categories. One category is chemical solutions, which employ a back-coating process. This involves modifying a color unit on the printing press, adjusting the paper feeding method so that the reverse side of the cardboard becomes the printing surface, and applying an anti-curling back coating liquid to this printing surface. After drying, the back coating liquid acts on the paper to correct its curling deformation. This method is very effective in eliminating paper curling, as the back coating liquid acts to absorb moisture on the back side and correct paper deformation. It also has a wide range of applications. However, this method requires specialized equipment modifications, resulting in a large investment. Furthermore, a single back coating liquid cannot meet the requirements of multiple cardboard types, and the requirements for the back coating liquid are high.

[0004] Another method is physical means, namely, using a special mechanism to reverse the curling direction of the cardboard to correct the paper curvature. For example, CN201420322379.3 provides a paper curl correction device for printing presses, including a rewinding device and a coating device. The coating device includes an ink supply mechanism, a printing mechanism, and a drying mechanism. By using the rewinding device to perform a primary correction of the paper by rewinding and a secondary correction by applying backing ink, it can effectively correct the curling deformation of printing paper such as cardboard and ensure printing quality. However, the rewinding device described in the solution is based on the batch of paper products that have been unwound and slit, and the next batch of paper is adjusted according to the curling condition, which has a certain lag. Furthermore, when adjusting the rewinding device, there is no clear data support, and it is all based on the operator's experience and intuition, which cannot be adjusted quickly and will produce a lot of unnecessary non-standard paper. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a reel paper unwinding and slitting device and its control system. By setting up a device to detect the degree of curling after the paper is cut into individual sheets, and linking it in real time with the straightening device, it can respond quickly and implement rapid control over the straightening state and degree of the paper, achieving standardization of the flatness parameters of the paper after slitting. Furthermore, it provides a complete set of rapid paper curling detection standards and a control system that is compatible with other straightening and flattening devices, based on the characteristics of the paper.

[0006] One of the objectives of this invention is to provide a flattening device for the reverse curvature during the unwinding and slitting process of roll paper, which adopts the following technical solution: A reverse curvature flattening device for the unwinding and slitting process of roll paper is characterized in that it is installed on a device for the secondary unwinding and slitting of paper that has been printed and rolled into a roll, and includes an unwinding mechanism and a transverse cutting mechanism, wherein a reverse curvature flattening mechanism and a paper curling angle detection mechanism are provided between the unwinding mechanism and the transverse cutting mechanism.

[0007] The unwinding mechanism includes an unwinding roller 1, an infrared probe for detecting the radius of the unwinding roll, a motor for controlling the unwinding tension, and a brake.

[0008] The recurved flattening mechanism is located on the side of the guide roller 2, which is movable up and down, at the exit end of the unwinding roller 1. It includes a recurved roller assembly 3 parallel to the axis of the guide roller 2, and a track disk 4. The recurved roller assembly 3 consists of two straight rollers with contacting surfaces and their respective rotating shafts 3-1. The rotating shafts 3-1 are connected to the track disks 4 at both ends. The track disks 4 have two concentric, non-penetrating annular tracks 4-1 with different radii. The ends of the rotating shafts 3-1 are engaged with the non-penetrating annular tracks 4-1. The two straight rollers of group 3 are connected as a whole by their respective rotating shafts 3-1 and rotate concentrically along their respective non-penetrating annular tracks 4-1. At the same time, the two straight rollers can rotate independently along their respective rotating shafts 3-1. The initial installation position of the inverted roller group 3 is higher than or equal to the horizontal plane where the guide roller 2 is located. In addition, a detection device for detecting the position and angle of the inverted roller group 3 on the non-penetrating annular track 4-1 and a power device for adjusting the angle of the inverted roller group 3 are provided on the outside of the two track discs 4.

[0009] The transverse cutting mechanism includes a support base and a cutting device. The support base is provided with a raw material rotary conveyor 5 and a single-sheet finished paper rotary conveyor 6 respectively according to the paper travel direction. The two are on the same horizontal plane and operate in the same direction. In addition, a cutting base plate 7 is provided between the raw material rotary conveyor 5 and the single-sheet finished paper rotary conveyor 6 through a bracket. A cutting opening is provided in the middle of the cutting base plate 7. A roller-shaped cutting knife 8 is provided above the cutting opening, and a strip-shaped cutting knife 9 is provided below the cutting opening. The roller-shaped cutting knife 8 and the strip-shaped cutting knife 9 cooperate with each other to cut the unwound paper to a standard length.

[0010] The paper curling angle detection mechanism is located behind the transverse cutting mechanism and includes a detection platform 11 parallel to the finished paper conveyor belt 10, and an ejection mechanism 11-5 opposite to the entrance of the detection platform 11 and located on the other side of the finished paper conveyor belt 10. The cut finished paper can be detected one by one, at intervals, or randomly. The detection platform 11 includes a longitudinal conveying platform 11-1 perpendicular to the direction of the finished paper conveyor belt 10, an upper clamping platform 11-2 and a lower clamping platform 11-3 installed at the rear of the detection platform 11, and a laser rangefinder 11-4 installed on the top of the detection platform 11 facing downwards and a corresponding control device. The upper clamping platform 11-2 and the lower clamping platform 11-3 are arranged opposite to each other, and both can be raised and lowered and can contact each other at a specific height in the middle. The longitudinal length of the upper clamping platform 11-2 and the lower clamping platform 11-3 is greater than the length of the finished paper, and the width is equal to 1 / 4 to 1 / 3 of the width of the flattened paper. The position of the laser rangefinder 11-4 is fixed, and the distance L between it and the end faces of the upper clamping platform 11-2 and the lower clamping platform 11-3, as well as the distance H between it and the contact surfaces of the two, are constant.

[0011] Preferably, the power unit for adjusting the angle of the inverted roller group 3, located outside the two track discs 4, includes a power motor 12, a transmission shaft 13, a transmission disc 14, and a transmission frame 15. The two power units have identical structures and are symmetrically installed with the center line of the inverted roller group 3 as the axis of symmetry. The power motor 12 is installed at the center of the outer side of the track disc 4, and its output shaft is connected to the transmission shaft 13 and extends to the center point of the track disc 4. The transmission disc 14 is mounted on the transmission shaft 13, and two transmission frames 15 are installed on the transmission disc 14. The transmission frames 15 extend upward, and their ends are connected from the outside to the rotating shafts 3-1 of the two inverted roller groups 3. The power motor 12 rotates, drives the transmission frames 15, and drives the rotating shafts 3-1 to rotate within the non-through-loop track 4-1, thereby realizing the inverted roller group 3 pulling the paper to complete a specific range of forward or reverse correction.

[0012] Preferably, the detection device located on the outside of the track disk 4 uses an angle encoder or a laser probe for detection, and is installed on the output shaft of the power motor 12 connected to the center of the track disk 4.

[0013] Preferably, the roller-shaped cutting blade 8 adopts a structure in which the outer elastic blade and the inner air expansion shaft cooperate. The inner air expansion shaft is inflated and deflated at a certain frequency to lift and contract the outer elastic blade. The strip-shaped cutting blade 9 is driven by a pneumatic component to lift and drop it upwards. The blades of the two blades come into contact and cut the paper.

[0014] Preferably, the ejection mechanism 11-5 uses compressed gas to drive a baffle to push the paper or a mechanical energy storage component to push the paper.

[0015] The second objective of this invention is to provide a control system for a flattening device for reverse curvature during the unwinding and slitting process of roll paper. The system comprises an adjustment unit 16, a detection unit 17, and a control feedback unit 18. The control feedback unit 18 calculates and compares the detection data to determine whether the paper needs to be straightened after unwinding and before cutting, and the direction and extent of the straightening, and then issues a command. The adjustment unit 16 receives the command and straightens the unwinding paper according to the command requirements. Afterwards, the detection unit 17 detects the straightened and cut paper again, and the control feedback unit 18 determines whether the adjustment unit 16 should be reset based on the detection data. The adjustment unit 16 includes a motor start / stop control module 16-1, a motor shaft position holding control module 16-2, and an angle information feedback module 16-3; the detection unit 17 includes a paper clamping mechanism position control module 17-1 and a power control module 17-2, a laser emitting module 17-3, a laser receiving module 17-4, and a data calculation and conversion module 17-5; the control feedback unit 18 includes a processor module 18-1, a signal receiving module 18-2, and a signal transmitting module 18-3, with the signal receiving module 18-2 and the signal transmitting module 18-3 respectively connected to the processor module 18-1; the motor start / stop control module 16-1, the motor shaft position holding control module 16-2, and the position control module 17-1 are connected to the signal transmitting module 18-3, while the angle information feedback module 16-3, the laser emitting module 17-3, the laser receiving module 17-4, and the data calculation and conversion module 17-5 are connected to the signal receiving module 18-2.

[0016] The horizontal plane mentioned in this application refers to the horizontal plane at the point of contact between the paper and the component supporting the paper as the paper passes through.

[0017] The control system achieves control according to the following steps: ① The upper clamping platform 11-2 and the lower clamping platform 11-3 in the detection unit 17 are in a separated state and are aligned with the plane on their respective sides. The cut finished paper is conveyed backward by the conveyor belt at a specific frequency. When the paper to be inspected reaches the ejection mechanism 11-5 opposite to the entrance of the detection platform 11, the ejection mechanism 11-5 works to quickly push the paper to be inspected to the adjacent detection platform 11. ②After the paper to be inspected is ejected onto the inspection platform 11, it is pushed by the longitudinal conveyor 11-1 to the baffle on the back of the lower clamping platform 11-3 and aligned with it; ③The upper clamping platform 11-2 descends and contacts the lower clamping platform 11-3 to fix the paper to be inspected. Then, the two platforms carry the paper to be inspected to a preset specific height. ④ The laser rangefinder 11-4 operates to measure the distance h between the detection point on the paper and the laser rangefinder 11-4; ⑤ The signal receiving module 18-2 in the control feedback unit 18 transmits the data to the processor module 18-1 for calculation and judgment. If the paper is not curled or only slightly curled, the distance h is equal to or close to the distance H between the laser rangefinder 11-4 and the contact surfaces of the upper clamping table 11-2 and the lower clamping table 11-3. Within the allowable error range, it can be determined that the paper to be inspected is not curled. The signal sending module 18-3 sends a signal to the motor start-stop control module 16-1, the motor shaft position holding control module 16-2 and the position control module 17-1 in the adjustment unit 16. The adjustment unit 16 maintains the initial state, and the paper is unwound and cut normally. If the distance h is greater than or less than H and exceeds the allowable range, the processor module 18-1 determines that the paper being inspected is bent in the forward or reverse direction. Based on the constant distance L and the actual detection distance h, and combined with trigonometric functions, the angle of the paper being inspected can be calculated. The signal sending module 18-3 sends a signal to the corresponding module, which performs forward or reverse correction of the corresponding intensity according to the direction and degree of the curl. If forward correction is performed, the motor shaft position holding control module 16-2 and the position control module 17-1 control the reverse roller group 3 in the third and fourth quadrants mentioned above; otherwise, it is controlled in the first and second quadrants. ⑥ The detection unit 17 re-inspects the corrected paper using steps ①-④, and adjusts the working status of the relevant modules of the adjustment unit 16 accordingly based on the detection results; this cycle is repeated to achieve online real-time detection, real-time correction, and real-time adjustment.

[0018] The beneficial effects of this invention are: The flattening device and its control system described in this invention can detect paper online in real time at a certain frequency and quickly provide feedback on the results. It can also control the straightening device to perform corresponding straightening in a timely manner. The detection speed is fast, the straightening range is wide, the control accuracy is high, and the paper curling problem is handled in a timely and rapid manner, which can ensure the quality stability of the same batch of products to the greatest extent. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the flattening device described in this application.

[0020] Figure 2 This is a schematic diagram of the structure of the inverted flattening mechanism.

[0021] Figure 3 yes Figure 2 A partial exploded view.

[0022] Figure 4 This is a partially enlarged view of the transverse cutting mechanism.

[0023] Figure 5 This is a top view of the paper curling angle detection mechanism.

[0024] Figure 6 This is a schematic diagram of the testing platform.

[0025] Figure 7 This is Figure A, showing the working status of the detection platform.

[0026] Figure 8 This is Figure B, showing the working status of the detection platform.

[0027] Figure 9 This is a structural block diagram of the control system of the flattening device described in this application.

[0028] In the diagram, the components are: 1. Unwinding roller; 2. Guide roller; 3. Reverse roller assembly; 3-1. Rotating shaft; 4. Track disc; 4-1. Non-through circular track; 5. Raw material rotary conveyor; 6. Sheet-wound finished paper rotary conveyor; 7. Cutting base plate; 8. Roller-shaped cutter; 9. Strip-shaped cutter; 10. Finished paper conveyor belt; 11. Detection platform; 11-1. Longitudinal conveyor; 11-2. Upper clamping platform; 11-3. Lower clamping platform; 11-4. Laser rangefinder; 11-5. Ejection mechanism; 12. Power motor; 13. Transmission shaft; 14. Drive disc. 14. Transmission frame; 15. Adjustment unit; 16. Motor start / stop control module; 16-1. Motor shaft position holding control module; 16-2. Angle information feedback module; 16-3. Detection unit; 17. Position control module; 17-1. Power control module; 17-2. Laser emission module; 17-3. Laser receiving module; 17-4. Data calculation and conversion module; 17-5. Control feedback unit; 18. Processor module; 18-1. Signal receiving module; 18-2. Signal sending module; 18-3. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 , 4 As shown in Figures 5 and 6, the flattening device and control system are used to unroll and cut the outer paper roll of the printed and hot-stamped cigarette pack. After cutting, the subsequent die-cutting and packaging processes can be carried out.

[0031] Because this reel is part of cigarette packaging, it involves many design factors, complex pattern combinations, a large printing area, and numerous processes. Furthermore, the cardboard itself is heavy, resulting in a large weight after the reel is rolled up. This causes significant stress during stacking, making it prone to deformation. Additionally, there may be squeezing and collisions during transport. Therefore, the probability of curling on the entire reel is high, and there are many curled areas, with variations in the direction and degree of curling in each area. If the traditional method is used, visually inspecting the individual sheets cut at the end of the process to determine the curling condition, and then adjusting the guide rollers during unwinding, is too inefficient, has slow feedback, and results in significant lag between steps.

[0032] The flattening device and control system described in this embodiment are installed on the corresponding unwinding and cutting equipment. The original unwinding mechanism and cutting mechanism are retained, and a reverse-curving flattening mechanism and a paper curling angle detection mechanism are added between the unwinding mechanism and the transverse cutting mechanism.

[0033] The recurved flattening mechanism is located on the side of the guide roller 2, which can move up and down at the exit end of the unwinding roller 1. It includes a recurved roller group 3 parallel to the axis of the guide roller 2. The recurved roller group 3 consists of two straight rollers with their roller surfaces in contact and their respective rotating shafts 3-1. The rotating shafts 3-1 are respectively connected to the track disks 4 at both ends. The track disks 4 are provided with two concentric non-penetrating annular tracks 4-1 with different radii. The ends of the rotating shafts 3-1 are clamped on the non-penetrating annular tracks 4-1. The two straight rollers of the recurved roller group 3 are connected as a whole through their respective rotating shafts 3-1 and rotate concentrically along their respective non-penetrating annular tracks 4-1. At the same time, the two straight rollers can rotate independently along their respective rotating shafts 3-1. In addition, a detection device and a power device are set on the outer side of the two track discs 4 to adjust the angle of the inverted roller group 3. There are two sets of power devices with identical structures, which are symmetrically installed with the center line of the inverted roller group 3 as the axis of symmetry. The power devices include a power motor 12, a transmission shaft 13, a transmission disc 14, and a transmission frame 15. The power motor 12 is installed at the center of the outer side of the track disc 4. Its output shaft is connected to the transmission shaft 13 and extends to the center point of the track disc 4. The transmission disc 14 is mounted on the transmission shaft 13. Two transmission frames 15 are installed on the transmission disc 14. The transmission frames 15 extend upward and their ends are connected to the rotating shafts 3-1 of the two inverted roller groups 3 from the outside. The power motor 12 rotates, drives the transmission frames 15, and drives the rotating shafts 3-1 to rotate in the non-through annular track 4-1, thereby realizing the inverted roller group 3 pulling the paper to complete the forward or reverse correction within a specific range. The detection device set on the outer side of the track disc 4 uses an angle encoder or a laser probe for detection. Both are installed on the output shaft of the power motor 12 connected to the center of the track disc 4.

[0034] refer to Figure 2 , 3 In practical applications, the initial installation position of the recurved roller group 3 is slightly higher than the horizontal plane of the guide roller 2. This means that the paper passing through will undergo a slight reverse correction. This is because most printed paper has an ink layer on the printed surface, which shrinks after drying. The paper tends to curl towards the side with the printed pattern. During normal unwinding and slitting, the paper can be flattened by undergoing a slight correction towards the back side. The initial installation position of the upper recurved roller described in this application is based on this characteristic.

[0035] The recurved roller assembly 3, under the action of the power unit, can rotate along the annular track within a certain angle range. In the side view, in the four-quadrant coordinate system formed with the center of the track disk 4 as the origin, the recurved roller assembly 3 is located in the first and second quadrants, and the paper is shaped in the reverse direction towards the side of the printed pattern; the recurved roller assembly 3 is located in the third and fourth quadrants, and the paper is shaped in the forward direction towards the back of the printed pattern. Since the non-penetrating annular track 4-1 on the track disk 4 is provided with at least one non-penetrating structure with a connection point, the recurved roller assembly 3, in conjunction with the guide roller 2 that can move up and down, can pull the paper to complete forward and reverse shaping within a range of less than 360°. Compared with the traditional traction roller, which can only move up and down to drive the paper to perform limited shaping, the shaping range and shaping accuracy of the paper are greatly improved.

[0036] Furthermore, as mentioned earlier, most printed paper has an ink layer added to the printed surface, which shrinks after drying. Therefore, the paper tends to curl towards the side where the printed pattern is set. Only in a few cases will the printed paper curl towards the back. Therefore, under normal circumstances, the reverse roller group 3 rotates and adjusts in the first and second quadrants most of the time to correct the paper in the reverse direction, and rarely corrects the paper in the forward direction.

[0037] The paper curling angle detection mechanism is located behind the transverse cutting mechanism and includes a detection platform 11 parallel to the finished paper conveyor belt 10, and an ejection mechanism 11-5 opposite to the entrance of the detection platform 11 and located on the other side of the finished paper conveyor belt 10. For the cut finished paper, individual, interval, or random detection can be performed. The detection platform 11 includes a longitudinal conveying table 11-1 perpendicular to the direction of the finished paper conveyor belt 10, and an upper clamping table 11-2 and a lower clamping table 11-3 installed at the rear of the detection platform 11. It also includes a mechanism installed on the inspection... The measuring platform 11 includes a laser ranging device 11-4 facing downwards at the top and a corresponding control device; the upper clamping platform 11-2 and the lower clamping platform 11-3 are arranged opposite each other, both of which can be raised and lowered and can contact each other at a specific height in the middle. The longitudinal length of the upper clamping platform 11-2 and the lower clamping platform 11-3 is greater than the length of the finished paper, and the width is equal to 1 / 4 to 1 / 3 of the width of the flattened paper; the position of the laser ranging device 11-4 is fixed, and the distance L between it and the end faces of the upper clamping platform 11-2 and the lower clamping platform 11-3, as well as the distance H between it and the contact surface of the two platforms, are constant.

[0038] refer to Figure 9The control system includes an adjustment unit 16, a detection unit 17, and a control feedback unit 18. The control feedback unit 18 calculates and compares the detection data to determine whether the paper needs to be corrected after unwinding and before cutting, and the direction and degree of correction, then issues a command. The adjustment unit 16 receives the command and adjusts the paper after unwinding according to the command requirements. Afterwards, the detection unit 17 detects the paper again after correction and cutting, and the control feedback unit 18 determines whether the adjustment unit 16 should be reset based on the detection data. The adjustment unit 16 includes a motor start / stop control module 16-1, a motor shaft position holding control module 16-2, and an angle information feedback module 16-3. The detection unit 17 includes a paper clamping mechanism. The system includes a position control module 17-1, a power control module 17-2, a laser emission and reception module, and a data calculation and conversion module 17-5. The control feedback unit 18 includes a processor module 18-1, a signal reception module 18-2, and a signal transmission module 18-3, with the signal reception module 18-2 and the signal transmission module 18-3 respectively connected to the processor module 18-1. The motor start / stop control module 16-1, the motor shaft position holding control module 16-2, and the position control module 17-1 are connected to the signal transmission module 18-3. The angle information feedback module 16-3, the position control module 17-1 of the paper clamping mechanism, the laser emission and reception module, and the data calculation and conversion module 17-5 are connected to the signal reception module 18-2.

[0039] refer to Figure 7 , 8 The control system achieves control by following these steps: The upper clamping platform 11-2 and the lower clamping platform 11-3 in the detection unit 17 are in a separated state and are aligned with the plane on their respective sides. The cut finished paper is conveyed backward by the conveyor belt at a specific frequency. When the paper to be inspected reaches the ejection mechanism 11-5 opposite to the entrance of the detection platform 11, the ejection mechanism 11-5 works to quickly push the paper to be inspected to the adjacent detection platform 11. After the paper to be inspected is ejected onto the inspection platform 11, it is pushed by the longitudinal conveyor 11-1 to the baffle on the back of the lower clamping platform 11-3 and aligned with it. The upper clamping stage 11-2 descends and contacts the lower clamping stage 11-3 to fix the paper to be inspected. Then, the two stages carry the paper to be inspected and rise to a preset specific height. The laser rangefinder 11-4 operates to measure the distance h between the detection point on the paper and the laser rangefinder 11-4; The signal receiving module 18-2 in the control feedback unit 18 transmits data to the processor module 18-1 for calculation and judgment. a. If the paper is not curled or only slightly curled, then the distance h is equal to or close to the distance H between the laser rangefinder 11-4 and the contact surfaces of the upper clamping platform 11-2 and the lower clamping platform 11-3. Within the allowable error range, it can be determined that the paper to be inspected is not curled. The signal sending module 18-3 sends a signal to the motor start / stop control module 16-1, the motor shaft position holding control module 16-2 and the position control module 17-1 in the adjustment unit 16. The adjustment unit 16 maintains the initial state, and the paper is unwound and cut normally. B. If the measured distance h is greater than or less than H and exceeds the allowable range, the processor module 18-1 determines that the paper being inspected is bent in the forward or reverse direction. Based on the constant distance L and the actual detection distance h, and combined with trigonometric functions, the angle of the paper being inspected can be calculated. The signal sending module 18-3 sends a signal to the corresponding module, which performs forward or reverse correction of the corresponding intensity according to the direction and degree of the curl. If forward correction is performed, the motor shaft position holding control module 16-2 and the position control module 17-1 control the reverse roller group 3 in the third and fourth quadrants mentioned above; otherwise, it is controlled in the first and second quadrants. c. The corrected paper will be re-inspected when it is sent to the detection unit 17. If the requirements are met, the signal sending module 18-3 sends a signal to the motor start / stop control module 16-1, the motor shaft position holding control module 16-2 and the position control module 17-1 in the adjustment unit 16, and the adjustment unit 16 returns to the initial state, and the paper is unwound and cut normally. If the same curling as in the initial test still exists and does not meet the requirements, a signal is issued based on the test results to adjust the working status of the relevant modules of the adjustment unit 16 accordingly, control the motor shaft position to keep the control module 16-2 and the position control module 17-1 rotating, increase the degree of correction, until the tested paper meets the requirements; This process is repeated in real time, involving online detection, real-time correction, real-time feedback, and real-time adjustment.

Claims

1. A device for flattening the curvature during the unwinding and slitting process of roll paper, characterized in that, The equipment is set up to perform secondary unwinding and slitting of printed and rolled paper, including an unwinding mechanism and a transverse cutting mechanism. A reverse flattening mechanism and a paper curling angle detection mechanism are set between the unwinding mechanism and the transverse cutting mechanism. The unwinding mechanism includes an unwinding roller (1), an infrared probe for detecting the radius of the unwinding disc, a motor for controlling the unwinding tension, and a brake. The anti-curve flattening mechanism is located on the side of the guide roller (2) that can move up and down at the exit end of the unwinding roller (1), including an anti-curve roller group (3) parallel to the axis of the guide roller (2) and a track disk (4); the anti-curve roller group (3) consists of two straight rollers with their roller surfaces in contact and their respective rotating shafts (3-1), the rotating shafts (3-1) are respectively connected to the track disks (4) at both ends, and the track disks (4) are provided with two concentric non-penetrating ring tracks (4-1) with different radii, and the ends of the rotating shafts (3-1) are clamped on the non-penetrating ring tracks (4-1); The two straight rollers of the inverted roller assembly (3) are connected as a whole by their respective rotating shafts (3-1) and rotate concentrically along their respective non-penetrating annular tracks (4-1). At the same time, the two straight rollers can rotate independently along their respective rotating shafts (3-1). The initial installation position of the inverted roller assembly (3) is higher than or equal to the horizontal plane where the guide roller (2) is located. In addition, a detection device for detecting the position and angle of the inverted roller assembly (3) on the non-penetrating annular track (4-1) and a power device for adjusting the angle of the inverted roller assembly (3) are provided on the outside of the two track discs (4). The transverse cutting mechanism includes a support base and a cutting device. The support base is provided with a raw material rotary conveyor (5) and a single sheet finished paper rotary conveyor (6) respectively according to the paper travel direction. The two are on the same horizontal plane and have the same operating direction. In addition, a cutting base plate (7) is provided between the raw material rotary conveyor (5) and the single sheet finished paper rotary conveyor (6) through a bracket. A cutting opening is provided in the middle of the cutting base plate (7). A roller-shaped cutting knife (8) is provided above the cutting opening, and a strip-shaped cutting knife (9) is provided below the cutting opening. The roller-shaped cutting knife (8) and the strip-shaped cutting knife (9) cooperate with each other to cut the unwound paper to a standard length. The paper curling angle detection mechanism is located behind the transverse cutting mechanism, including a detection platform (11) parallel to the finished paper conveyor belt (10), and an ejection mechanism (11-5) opposite to the entrance of the detection platform (11) and located on the other side of the finished paper conveyor belt (10); the cut finished paper can be detected one by one, at intervals or randomly. The detection platform (11) includes a longitudinal conveying platform (11-1) perpendicular to the direction of the finished paper conveyor belt (10), an upper clamping platform (11-2) and a lower clamping platform (11-3) installed at the rear of the detection platform (11), and a laser rangefinder (11-4) installed on the top of the detection platform (11) and facing downwards, and a corresponding control device; the upper clamping platform (11-2) and the lower clamping platform (11-3) are arranged opposite to each other, and both can be raised and lowered and can contact each other at a specific height in the middle. The longitudinal length of the upper clamping platform (11-2) and the lower clamping platform (11-3) is greater than the length of the finished paper, and the width is equal to 1 / 4 to 1 / 3 of the width of the flattened paper; the position of the laser rangefinder (11-4) is fixed, and the distance L between it and the end face of the upper clamping platform (11-2) and the lower clamping platform (11-3), as well as the distance H between it and the contact surface of the two, are constant.

2. The anti-curvature flattening device in the unwinding and slitting process of a roll paper as described in claim 1, characterized in that, The power unit set outside the two track discs (4) for adjusting the angle of the inverted roller group (3) includes a power motor (12), a transmission shaft (13), a transmission disc (14), and a transmission frame (15). The two sets of power units have the same structure and are symmetrically installed with the center line of the inverted roller group (3) as the axis of symmetry. The power motor (12) is installed at the center of the outside of the track disc (4). Its output shaft is connected to the transmission shaft (13) and extends to the center point of the track disc (4). The transmission disc (14) is mounted on the transmission shaft (13). Two transmission frames (15) are installed on the transmission disc (14). The transmission frames (15) extend upward and their ends are connected from the outside to the rotating shafts (3-1) of the two inverted roller groups (3). The power motor (12) rotates, drives the transmission frame (15), and drives the rotating shaft (3-1) to rotate in the non-through ring track (4-1), thereby realizing that the inverted roller group (3) pulls the paper to complete the forward or reverse correction within a specific range.

3. A reel paper unwinding and slitting device for flattening the curvature during the paper roll unwinding and slitting process according to claim 1 or 2, characterized in that, The detection device set on the outside of the track disk (4) uses an angle encoder or a laser probe for detection, and is installed on the output shaft of the power motor (12) connected to the center of the track disk (4).

4. A reel paper unwinding and slitting device for flattening the curvature during the paper roll unwinding and slitting process according to claim 1 or 2, characterized in that, The roller-shaped cutting blade (8) adopts a structure in which the outer elastic blade and the inner air expansion shaft cooperate. The inner air expansion shaft is inflated and deflated at a certain frequency to lift and contract the outer elastic blade. The strip-shaped cutting blade (9) is driven by a pneumatic component to lift and drop it upwards. The blades of the two contact each other to cut the paper.

5. The anti-curvature flattening device in the unwinding and slitting process of a roll paper as described in claim 3, characterized in that, The roller-shaped cutting blade (8) adopts a structure in which the outer elastic blade and the inner air expansion shaft cooperate. The inner air expansion shaft is inflated and deflated at a certain frequency to lift and contract the outer elastic blade. The strip-shaped cutting blade (9) is driven by a pneumatic component to lift and drop it upwards. The blades of the two contact each other to cut the paper.

6. The anti-curvature flattening device in the unwinding and slitting process of a roll paper as described in claim 1, characterized in that, The ejection mechanism (11-5) uses compressed gas to drive a baffle to push the paper or a mechanical energy storage component to push the paper.

7. A control system for a flattening device for reverse curvature during the unwinding and slitting process of a roll of paper, characterized in that, It includes an adjustment unit (16), a detection unit (17), and a control feedback unit (18); the control feedback unit (18) calculates and compares the detection results to determine whether the paper needs to be straightened after unwinding and before cutting, as well as the direction and degree of straightening, and then issues an instruction; the adjustment unit (16) accepts the instruction and straightens the paper after unwinding according to the instruction requirements; then the detection unit (17) checks the paper after straightening and cutting again, and the control feedback unit (18) decides whether the adjustment unit (16) should be reset based on the detection results; The adjustment unit (16) includes a motor start / stop control module (16-1), a motor shaft position holding control module (16-2), and an angle information feedback module (16-3); the detection unit (17) includes a paper clamping mechanism position control module (17-1) and a power control module (17-2), a laser emitting module (17-3), a laser receiving module (17-4), and a data calculation and conversion module (17-5); the control feedback unit (18) includes a processor module (18-1) and a signal receiving module (18-2). The signal receiving module (18-2) and the signal transmitting module (18-3) are respectively connected to the processor module (18-1); the motor start-stop control module (16-1), the motor shaft position holding control module (16-2), and the position control module (17-1) are connected to the signal transmitting module (18-3); the angle information feedback module (16-3), the laser emitting module (17-3), the laser receiving module (17-4), and the data calculation and conversion module (17-5) are connected to the signal receiving module (18-2).

8. The control system for the anti-curvature flattening device in the unwinding and slitting process of a roll paper as described in claim 7, characterized in that, The control system achieves control according to the following steps: ① The upper clamping platform (11-2) and the lower clamping platform (11-3) in the detection unit (17) are in a separated state and are aligned with the plane on their respective sides. The cut finished paper is conveyed backward by the conveyor belt at a specific frequency. When the paper to be inspected reaches the ejection mechanism (11-5) opposite to the entrance of the detection platform (11), the ejection mechanism (11-5) works to quickly push the paper to be inspected to the adjacent detection platform (11). ②After the paper to be inspected is ejected onto the inspection platform (11), it is pushed to the baffle on the back of the lower clamping platform (11-3) and aligned with it via the longitudinal conveyor (11-1); ③ The upper clamping platform (11-2) descends and contacts the lower clamping platform (11-3) to fix the paper to be inspected. Then the two platforms carry the paper to be inspected to a preset specific height. ④ The laser rangefinder (11-4) operates to measure the distance h between the detection point on the paper and the laser rangefinder (11-4); ⑤ The signal receiving module (18-2) in the control feedback unit (18) transmits the data to the processor module (18-1) for calculation and judgment. If the paper is not curled or slightly curled, the distance h is equal to or close to the distance H between the laser rangefinder (11-4) and the contact surfaces of the upper clamping platform (11-2) and the lower clamping platform (11-3). Within the allowable error range, it can be determined that the paper to be inspected is not curled. The signal sending module (18-3) sends a signal to the motor start-stop control module (16-1), the motor shaft position holding control module (16-2) and the position control module (17-1) in the adjustment unit (16). The adjustment unit (16) maintains the initial state, and the paper is unwound and cut normally. If the distance h is greater than or less than H and exceeds the allowable range, the processor module (18-1) determines that the paper being inspected is bent in the forward or reverse direction, and calculates the angle of the paper curling based on the constant distance L and the actual detection distance h, combined with trigonometric function knowledge; the signal sending module (18-3) sends a signal to the corresponding module, and performs forward or reverse correction of the corresponding intensity according to the direction and degree of curling; if forward correction is performed, the motor shaft position holding control module (16-2) and the position control module (17-1) control the reverse roller group (3) in the third and fourth quadrants mentioned above; otherwise, it is controlled in the first and second quadrants; ⑥ The detection unit (17) re-inspects the corrected paper using steps ①-④, and adjusts the working status of the relevant modules of the adjustment unit (16) accordingly based on the detection results; this cycle is repeated to achieve online real-time detection, real-time correction, and real-time adjustment.

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