Film connecting control method for packaging machine, film connecting system and storage medium

Abstract

The invention relates to a film connecting control method and system for a packaging machine and a storage medium, and the method comprises the steps that when a first film in a first film roll is emptied, the first height of a floating roller at a first preset position and the second height of the floating roller at a second preset position are recorded; receiving a first color code signal provided by a color code sensor after a first film in the first film roll is emptied; the position of a roller shaft of the power roller when the first color code signal is received serves as a reference position, and a first moving distance is determined based on the difference value between the first height and the second height and the first length of the first film between the clamping roller and the last color code on the first film of the first film roll when the clamping roller is located at the first preset position; action time of the air cylinder is obtained; and continuing the second film to the first film based on the first movement distance and the operation time.

Description

Technical Field

[0001] The present invention relates to the field of packaging machines, and more specifically, to a film receiving control method, a film receiving system, and a storage medium for a packaging machine. Background Art

[0002] A packaging machine is a mechanical device specifically used to encapsulate products in specific packaging materials, and is widely used in multiple industries such as food, medicine, cosmetics, and electronic products. They can automatically or semi-automatically complete a series of packaging processes, from filling, sealing, forming to labeling and packing, greatly improving the efficiency and consistency of packaging operations, while also reducing labor costs and potential human errors.

[0003] Ultra-high-speed packaging machines usually have a packaging speed of over 1000 packs per minute, and according to the different lengths of product bags, the linear speed can reach 120 - 150 meters per minute. In order to ensure the continuity of high-speed production, automatic roll change control is required for the roll materials (i.e., film rolls) used for packaging. During the roll change process, the running speed of the packaging machine should be considered. If the roll change speed is too slow or the control of the new roll input is not good, situations such as film breakage may occur, seriously affecting production efficiency. In addition, for the printed patterns of packaging, it is necessary to ensure that the color marks between the old and new films can be accurately aligned and spliced as much as possible. If the color marks of the old and new rolls are misaligned, it may take more time to correct the deviation, resulting in more waste film.

[0004] For traditional low-speed machines, the replacement of film rolls mainly relies on empirical parameters. The operator judges the error of multiple film receptions according to different speeds and the action time of the pinch rollers, and inputs the approximate number of color marks and the remaining length on the human-machine interface to perform film reception. This control method has unstable effects in the case of high-speed material receiving, resulting in more waste film and being difficult to meet the requirements of accurate film reception and high-speed production. Summary of the Invention

[0005] In view of the situation and deficiencies of the prior art, the purpose of the present invention is to provide a film receiving control method, a film receiving system, and a storage medium for a packaging machine, which take the first color mark signal after the film is emptied as a reference, consider the influence of the floating roller movement and the action time of the pinch roller cylinder of the packaging machine, obtain an accurate film receiving timing, thereby improving the film receiving accuracy, reducing the generation of waste film, and ensuring the production efficiency of the packaging machine.

[0006] According to an embodiment of the present invention, a film splicing control method for a packaging machine is provided, the packaging machine comprising: a first reel, which is sleeved with a first film roll used for packaging; a second reel, which is arranged opposite to the first reel in a horizontal direction, and a second film roll identical to the first film roll is sleeved on the second reel; a clamping roller, which is arranged below the middle of a line connecting the first reel to the second reel, the clamping roller having two rollers arranged opposite to each other, and a first film from the first film roll passes through a gap between the two rollers; a floating roller, which comprises a movable roller shaft and a fixed roller shaft corresponding to the movable roller shaft, the floating roller being arranged below the clamping roller and being able to move up and down within a predetermined position range in a vertical direction, and the first film passing through the gap of the clamping roller is wound around the movable roller shaft and the fixed roller shaft of the floating roller; a power roller, which is configured to be able to drive the first film wound around the floating roller to move; and a color mark sensor, which is arranged downstream of the power roller, and is configured to detect a color mark on the first film moved by the power roller and provide a color mark signal, wherein the distance between two adjacent color marks on the first film is equal, the method comprising: determining the first film in the first film roll Whether it has been emptied, when it is determined that the first film in the first film roll is emptied, record a first height of the floating roller at a first predetermined position within the predetermined position range and a second height of the floating roller at a second predetermined position within the predetermined position range, wherein the first predetermined position is the position of the floating roller within the predetermined position range when the first film is emptied, and the second predetermined position is the lowest position within the predetermined position range to which the floating roller moves downward after the first film is emptied; receive a first color mark signal provided by the color mark sensor after the first film in the first film roll is emptied; take the position of the roller shaft of the power roller when the first color mark signal is received as the reference position, determine a first moving distance based on the difference between the first height and the second height and the first length of the first film between the clamping roller and the last color mark on the first film of the first film roll when the floating roller is at the first predetermined position; obtain the action time for actuating the clamping roller; and based on the first moving distance and the action time, feed the second film of the second film roll into the gap of the clamping roller, actuate the clamping roller to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

[0007] In the above manner, taking the first color mark signal after the film is emptied as a reference, considering the influence of the movement of the floating roller and the action time of the clamping roller of the packaging machine, the accurate film splicing timing is obtained, thereby improving the film splicing accuracy, reducing the generation of waste film, and ensuring the production efficiency of the packaging machine.

[0008] In a film splicing control method for a packaging machine according to an embodiment of the present invention, before determining whether the first film in the first film roll has been emptied, the method further includes: determining whether the diameter of the first film roll has reached a predetermined diameter, and when it is determined that the diameter of the first film roll has reached the predetermined diameter, moving the floating roller downward to a first predetermined position in a predetermined position range, wherein the predetermined diameter indicates that the first film in the first film roll is about to be emptied.

[0009] By adopting the above-mentioned method, it is avoided that when the film roll is emptied, the floating roller falls from a higher position to generate a large impact force, thereby preventing safety problems.

[0010] In a film splicing control method for a packaging machine according to an embodiment of the present invention, taking the position of the roller shaft of the power roller when receiving the first color mark signal as the reference position, determining the first moving distance based on the difference between the first height and the second height and the first length of the first film between the clamping roller and the last color mark on the first film of the first film roll when the floating roller is at the first predetermined position includes: recording the position of the roller shaft as the first position when the first film in the first film roll is emptied and the floating roller is at the first predetermined position; and obtaining the first length of the first film when the roller shaft is at the first position; recording the position of the roller shaft as the second position when receiving the first color mark signal; and calculating the moving length of the first film moved by the power roller when rotating from the first position to the second position based on the first position and the second position, assuming that the first length is L1, the moving length is L0, and the difference between the first height and the second height is Δx, then the first moving distance D1=L1-L0-nΔx, where n is a positive integer related to the number of movable roller shafts and fixed roller shafts of the floating roller.

[0011] Through the above method, a specific expression of the first moving distance is provided.

[0012] In a film splicing control method for a packaging machine according to an embodiment of the present invention, based on a first moving distance and an action time, the second film of the second film roll is fed into a gap between the clamping rollers, and the clamping rollers are actuated to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film, including: calculating a predetermined length of movement of the first film within the action time according to the action time and the speed at which the powered roller moves the first film; subtracting the predetermined length from the first moving distance to obtain a second moving distance; when the powered roller moves the first film the second moving distance, feeding the second film of the second film roll into the gap between the clamping rollers, and actuating the clamping rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

[0013] Through the above method, a specific method for obtaining the second moving distance is provided.

[0014] In the film splicing control method for a packaging machine according to an embodiment of the present invention, let the distance between adjacent color marks on the first film be Lp, L = L1 - L0, the number of color mark intervals of the first film in the length L be k, and the remaining length of the first film in the length L except for the k color mark intervals be b. Then the first moving distance D1 = k×Lp + b - nΔx. Let the second moving distance be D2 and the predetermined length be L2. Then the second moving distance D2 = D1 - L2 = k×Lp + b - nΔx - L2. Among them, when the first film is moved by the second moving distance by the driving roller, the second film of the second film roll is fed into the gap between the pinch rollers, and the pinch rollers are actuated to reduce the gap to clamp the first film and the second film. And splicing the second film to the first film includes: taking the time when the roller shaft is in the second position as a reference, obtaining the number k0 of the color mark signals detected by the color mark sensor; if Lp > nΔx, after k0 = k - 1, making the driving roller move the first film by a distance of Lp + b - nΔx - L2 again, feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, so as to splice the second film to the first film; and if Lp < nΔx, after k0 = k - 2, making the driving roller move the first film by a distance of 2Lp + b - nΔx - L2 again, feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, so as to splice the second film to the first film.

[0015] Expressing the second moving distance in units of color mark intervals provides a more accurate way to control the film splicing timing.

[0016] According to another embodiment of the present invention, a film splicing system is provided, comprising: a packaging machine, the packaging machine comprising: a first reel, which is sleeved with a first film roll used for packaging; a second reel, which is arranged opposite to the first reel in a horizontal direction, and a second film roll identical to the first film roll is sleeved on the second reel; a clamping roller, which is arranged below the middle of a line connecting the first reel to the second reel, and the clamping roller has two rollers arranged opposite to each other, and a first film from the first film roll passes through a gap between the two rollers; a floating roller, which includes a movable roller shaft and a fixed roller shaft corresponding to the movable roller shaft, and the floating roller is arranged below the clamping roller and can move up and down within a predetermined position range in a vertical direction, and the first film passing through the gap of the clamping roller is wound around the movable roller shaft and the fixed roller shaft of the floating roller; a power roller, which is configured to drive the first film wound around the movable roller shaft and the fixed roller shaft of the floating roller to move; and a color mark sensor, which is arranged downstream of the power roller and is configured to detect a color mark on the first film moved by the power roller and provide a color mark signal when the color mark is detected, wherein the distance between two adjacent color marks on the first film is equal, and a control system, which is connected to the packaging machine for communication. The control system is configured to: determine whether the first film in the first film roll has been emptied, and when it is determined that the first film in the first film roll is emptied, record a first height of the floating roller at a first predetermined position within the predetermined position range and a second height of the floating roller at a second predetermined position within the predetermined position range, wherein the first predetermined position is the position of the floating roller within the predetermined position range when the first film is emptied, and the second predetermined position is the lowest position within the predetermined position range to which the floating roller moves downward after the first film is emptied; receive a first color mark signal provided by a color mark sensor after the first film in the first film roll is emptied; determine a first moving distance based on the difference between the first height and the second height and a first length of the first film between the clamping roller and the last color mark on the first film of the first film roll when the floating roller is at the first predetermined position, taking the position of the roller shaft of the power roller when the first color mark signal is received as a reference position; obtain an action time for actuating the clamping roller; and based on the first moving distance and the action time, feed the second film of the second film roll into the gap of the clamping roller, actuate the clamping roller to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

[0017] In the above manner, taking the first color mark signal after the film is emptied as a reference, considering the influence of the movement of the floating roller and the action time of the clamping roller of the packaging machine, the accurate film splicing timing is obtained, thereby improving the film splicing accuracy, reducing the generation of waste film, and ensuring the production efficiency of the packaging machine.

[0018] In a film splicing system according to another embodiment of the present invention, taking the position of the roller shaft of the driving roller when the first color mark signal is received as the reference position, based on the difference between the first height and the second height and the first length of the first film between the pinch roller and the last color mark on the first film of the first film roll when the floating roller is in the first predetermined position, determining the first moving distance includes: when the first film in the first film roll is emptied and the floating roller is in the first predetermined position, recording the position of the roller shaft of the driving roller as the first position; and obtaining the first length of the first film when the roller shaft of the driving roller is at the first position; when the first color mark signal is received, recording the position of the roller shaft of the driving roller as the second position; and based on the first position and the second position, calculating the moving length of the first film moved by the driving roller when rotating from the first position to the second position; setting the first length as L1, the moving length as L0, and the difference between the first height and the second height as Δx, then the first moving distance D1 = L1 - L0 - nΔx, where n is a positive integer related to the number of movable roller shafts and fixed roller shafts of the floating roller.

[0019] In the above manner, a specific expression of the first moving distance is provided.

[0020] In a film splicing system according to another embodiment of the present invention, based on the first moving distance and the action time, feeding the second film of the second film roll into the gap of the pinch roller, actuating the pinch roller to reduce the gap to clamp the first film and the second film, thereby splicing the second film to the first film includes: calculating the predetermined length of the first film moved within the action time according to the action time and the speed of the driving roller moving the first film; subtracting the predetermined length from the first moving distance to obtain the second moving distance; when the driving roller moves the first film by the second moving distance, feeding the second film of the second film roll into the gap of the pinch roller, actuating the pinch roller to reduce the gap to clamp the first film and the second film, thereby splicing the second film to the first film.

[0021] In the above manner, a specific method for obtaining the second moving distance is provided.

[0022] In a film splicing system according to another embodiment of the present invention, let the distance between adjacent color marks on the first film be Lp, L = L1 - L0, the number of color mark intervals on the first film in the length L be k, and the remaining length of the first film in the length L except for the k color mark intervals be b. Then the first moving distance D1 = k×Lp + b - nΔx. Let the second moving distance be D2 and the predetermined length be L2. Then the second moving distance D2 = D1 - L2 = k×Lp + b - nΔx - L2. Among them, when the first film is moved by the driving roller by the second moving distance, the second film of the second film roll is fed into the gap between the pinch rollers, and the pinch rollers are actuated to reduce the gap to clamp the first film and the second film, so as to splice the second film to the first film, including: taking the position where the roller shaft of the driving roller is located at the second position as a reference, obtaining the number k0 of color mark signals detected by the color mark sensor; if Lp > nΔx, after k0 = k - 1, the driving roller is made to move the first film by a distance of Lp + b - nΔx - L2 again, then the second film of the second film roll is fed into the gap between the pinch rollers, and the pinch rollers are actuated to reduce the gap to clamp the first film and the second film, so as to splice the second film to the first film; and if Lp < nΔx, after k0 = k - 2, the driving roller is made to move the first film by a distance of 2Lp + b - nΔx - L2 again, then the second film of the second film roll is fed into the gap between the pinch rollers, and the pinch rollers are actuated to reduce the gap to clamp the first film and the second film, so as to splice the second film to the first film.

[0023] Expressing the second moving distance in units of color mark intervals provides a more accurate way to control the film splicing timing.

[0024] According to another embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, it causes the control system to execute the film splicing control method for the packaging machine according to the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 A partial schematic diagram related to film splicing control of the packaging machine is shown.

[0027] Figure 2 A flowchart of the film splicing control method for the packaging machine according to an embodiment of the present invention is shown.

[0028] Figure 3 A schematic diagram of the length of the film between the first film roll and the color mark sensor at the moment when the film is emptied is shown.

[0029] Figure 4Shows a schematic diagram of the length of the film between the first film roll and the color mark sensor when the first color mark signal is detected.

[0030] Figure 5 Shows a block diagram of a film splicing system according to another embodiment of the present invention.

[0031] Among them, the reference numerals are as follows:

[0032] 1: Packaging machine

[0033] 101: First reel

[0034] 103: Second reel

[0035] 105: Pinch roller

[0036] 107: Floating roller

[0037] 109: Driving roller

[0038] 111: First reel diameter detector

[0039] 113: Second reel diameter detector

[0040] 115: First film emptying detection switch

[0041] 117: Second film emptying detection switch

[0042] 119: Color mark sensor

[0043] 1011: First film roll

[0044] 1031: Second film roll

[0045] 1051, 1053: Two opposite rollers of the pinch roller

[0046] S1 - S5: Steps

[0047] C: Color mark

[0048] C1: Last color mark

[0049] xa: First predetermined position

[0050] xb: Second predetermined position

[0051] 2: Film splicing system

[0052] 3: Control system. Detailed implementation mode

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] To better understand the present invention, before describing the film receiving control method for a packaging machine of the present invention, the structure of the packaging machine related to film receiving control will be first introduced below.

[0055] Figure 1 A partial schematic diagram of the packaging machine related to film receiving control is shown.

[0056] As Figure 1 shown, the packaging machine 1 includes a first reel 101, a second reel 103, a pinch roller 105, a floating roller 107, a power roller 109, a first reel diameter detector 111, a second reel diameter detector 113, a first film emptying detection switch 115, a second film emptying detection switch 117, and a color mark sensor 119.

[0057] A first film roll 1011 for packaging can be sleeved on the first reel 101. The first film roll 1011 is an annular roll formed by winding a packaging film with a through hole in the middle. The first film roll 1011 is sleeved on the first reel 101 through the through hole. Marks with special colors or patterns, that is, color marks, are printed on the packaging film at a certain repetition period. By identifying the color marks, continuous pattern, position control, and waste minimization in the automated packaging process can be achieved. It should be noted here that the distance between two adjacent color marks on the first film is equal.

[0058] For clarity, in the following text, the film in the first film roll 1011 will be referred to as the "first film".

[0059] The second reel 103 is disposed opposite to the first reel 101 in the horizontal direction. A second film roll 1031 can be sleeved on the second reel 103. Here, the second film roll 1031 is exactly the same as the first film roll 1011 and serves as a spare film roll for the first film roll 1011.

[0060] For clarity, in the following text, the film in the second film roll 1013 will be referred to as the "second film", and the second film is exactly the same as the first film.

[0061] The pinch roller 105 is arranged below the middle of the line connecting the first reel 101 and the second reel 103. The pinch roller 105 has two relatively arranged rollers 1051 and 1053, and the first film from the first film roll 1011 passes through the gap between the two rollers 1051 and 1053. When the packaging machine is running normally, the gap between the two rollers 1051 and 1053 is open for the moving film to pass through the gap. When it is necessary to connect the second film to the tail of the first film, the two rollers 1051 and 1053 reduce the gap between them according to the control signal, and clamp the first film and the second film clamped in the gap, so as to connect the second film to the tail of the first film.

[0062] The floating roller 107 is arranged below the pinch roller 105, including a movable roller shaft and a fixed roller shaft corresponding to the movable roller shaft. The movable roller shaft can move up and down within a predetermined position range in the vertical direction, and the first film passing through the gap of the pinch roller 105 can be wound around the movable roller shaft and the fixed roller shaft of the floating roller 107. During the conveying process of the film, if there is no appropriate tension, situations such as slack, wrinkles or breakage may occur. The floating roller ensures that the film is always under a certain tension by floating up and down within a predetermined position range, so as to maintain the stability and straightness of the film. When the packaging machine is running normally, the floating roller is usually located at the middle position within a predetermined position range in the vertical direction.

[0063] According to the structure of the packaging machine, the floating roller can have, for example, 2 movable roller shafts and 2 corresponding fixed roller shafts, and the film passing through the gap of the pinch roller is wound around the movable roller shaft and the corresponding fixed roller shaft, so that the floating roller has the functions of storing film and adjusting film tension.

[0064] The power roller 109 is configured to be able to drive the first film wound around the movable roller shaft and the fixed roller shaft of the floating roller 107 to move. The power roller is usually directly or indirectly driven by a motor or other power source, and controls the moving speed and direction of the film through friction or a special clamping mechanism.

[0065] The color mark sensor 119 is arranged downstream of the power roller 109 and is configured to detect the color mark on the first film moved by the power roller 109 and provide a color mark signal to the control system ( Figure 1 not shown in the figure). In this article, the control system can be a programmable logic controller (PLC).

[0066] The first diameter detector 111 can detect the diameter of the first film roll 1011 and transmit the detection result to the control system.

[0067] The second diameter detector 113 can detect the diameter of the second film roll 1031 and transmit the detection result to the control system

[0068] The first film emptying detection switch 115 is arranged near the first film roll 1011 and can be triggered when the film on the first film roll 1011 is emptied, generating a film emptying signal and transmitting the film emptying signal to the control system. In this article, "emptying" means the state where all the film in the film roll has been used up and there is no available film on the film roll.

[0069] The second film emptying detection switch 117 is arranged near the second film roll 1031 and can be triggered when the film on the second film roll 1031 is emptied, generating a film emptying signal and transmitting the film emptying signal to the control system.

[0070] The first film emptying detection switch 115 and the second film emptying detection switch 117 can be, for example, photoelectric detection switches.

[0071] The actuation of the pinch roller 105 can be carried out by the pinch roller cylinder according to the control signal received from the control system.

[0072] Figure 2 The flowchart of the film receiving control method for a packaging machine according to an embodiment of the present invention is shown. Figure 3 The schematic diagram of the length of the film between the first film roll and the color mark sensor at the moment of film emptying is shown. Figure 4 The schematic diagram of the length of the film between the first film roll and the color mark sensor when the first color mark signal is detected is shown. Next, in conjunction with Figures 1 to 4 , the film receiving control method for a packaging machine according to an embodiment of the present invention will be described.

[0073] As Figure 2 shown, the film receiving control method for a packaging machine according to an embodiment of the present invention includes steps S1 to S5.

[0074] Before step S1, it can be first determined whether the diameter of the first film roll reaches a predetermined diameter. When the diameter of the first film roll reaches the predetermined diameter, the floating roller is moved downward to the first predetermined position within a predetermined position range, where the predetermined diameter indicates that the first film in the first film roll is about to be emptied.

[0075] Specifically, the first roll diameter detector 111 detects the diameter of the first film roll 1011 in real time and sends the detection result to the PLC control system. The PLC control system determines whether the diameter of the first film roll 1011 reaches the predetermined diameter. Here, the "predetermined diameter" indicates that the first film in the first film roll is about to be emptied, and this predetermined diameter can be set according to the packaging speed of the packaging machine, the diameter of the first reel, etc.

[0076] When it is determined that the diameter of the first film roll 1011 reaches a predetermined diameter, the PLC control system instructs the floating roller 107 to move down from the normal working position to the first predetermined position within a predetermined position range. In this article, the distance from the first predetermined position to the lowest position within the predetermined position range is less than the distance from the normal working position to the lowest position. This avoids a large impact force generated when the floating roller falls from a higher position when the film roll is emptied, thus preventing safety problems.

[0077] In step S1, it is determined whether the first film in the first film roll has been emptied. When it is determined that the first film in the first film roll is emptied, the first height of the floating roller at the first predetermined position and the second height of the floating roller at the second predetermined position are recorded. Here, the second predetermined position is the lowest position within the predetermined position range to which the floating roller moves down after the first film is emptied.

[0078] After the first film in the first film roll is emptied, the floating roller will move down from the first predetermined position to the second predetermined position. When the PLC control system receives a film empty signal from the first film empty detection switch 115, it is determined that the first film in the first film roll 1011 has been emptied. When the first film in the first film roll 1011 is emptied, the PLC control system records the first height of the floating roller 107 at the first predetermined position and the second height of the floating roller 107 at the second predetermined position. For example, in Figure 1 , the first height of the floating roller 107 at the first predetermined position is xa, and the second height of the floating roller 107 at the second predetermined position is xb. Thus, the height difference between the first height and the second height is Δx = xa - xb.

[0079] In step S2, the first color mark signal provided by the color mark sensor after the first film in the first film roll is emptied is received.

[0080] In step S3, taking the position of the roller shaft of the power roller when the first color mark signal is received as the reference position, based on the difference between the first height and the second height and the first length of the first film between the pinch roller and the last color mark on the first film of the first film roll when the floating roller is at the first predetermined position, the first moving distance is determined.

[0081] Specifically, when the first film in the first film roll 1011 is emptied and the floating roller 107 is at the first predetermined position xa, the PLC control system records the position of the roller shaft of the power roller 109 as the first position. It should be noted here that the position of the roller shaft is characterized by the rotation angle of the roller shaft, and the rotation angle of the roller shaft from the first position to the second position can be converted into the moving length of the film driven by the rotation of the roller shaft by using the relationship between the rotation angle of the roller shaft from the first position to the second position and the radius of the roller shaft and the corresponding arc length of the roller shaft rotation.

[0082] In addition, when the first film in the first film roll 1011 is emptied and the floating roller 107 is at the first predetermined position xa, the PLC control system obtains the first length L1 of the first film between the pinch roller 105 and the last color mark on the first film of the first film roll 1011 when the roller shaft of the power roller 109 is at the first position. In fact, there is usually a certain length of trailing film (with a fixed length) after the last color mark of the first film. However, when splicing the films, the second film is spliced at the position of the last color mark of the first film. Therefore, the first length of the first film can be obtained by subtracting the length of the trailing film from the distance between the pinch roller 105 and the first film roll 1011. It should be noted here that for a packaging machine, the distance between its pinch roller and the first film roll is fixed and known.

[0083] As Figure 3 shown, when the first film in the first film roll 1011 is emptied and the floating roller 107 is at the first predetermined position xa, the color mark sensor 119 is not aligned with the color mark C on the first film, that is, the color mark sensor 119 does not detect a color mark signal. At this time, the length of the first film between the pinch roller 105 and the last color mark C1 on the first film of the first film roll 1011 is the first length L1.

[0084] The color mark sensor 119 detects the color marks on the first film moved by the power roller 109 in real time and provides a color mark signal to the control system when a color mark is detected. After the first film in the first film roll 1011 is emptied, the color mark sensor 119 detects the first color mark signal on the first film after the time point when the first film in the first film roll 1011 is emptied, and transmits the first color mark signal to the PLC control system. When the PLC control system receives the first color mark signal, it records the second position of the roller shaft of the power roller 109 and uses this second position as the reference position for starting the film splicing operation. Thus, according to the first position and the second position of the roller shaft of the power roller 109, the moving length L0 of the first film moved by the power roller when rotating from the first position to the second position can be calculated.

[0085] Furthermore, considering that after the first film in the first film roll 1011 is emptied, the floating roller 107 descends from the first height xa to the second height xb (the height difference between them is Δx), then at this time, the distance between the pinch roller 105 and the last color mark C1 on the first film of the first film roll 1011, that is, the first moving distance, can be expressed as:

[0086] D1 = L1 - L0 - nΔx

[0087] where n is a positive integer related to the number of movable roller shafts and fixed roller shafts of the floating roller.

[0088] In this article, the value of n is related to the number of movable roller shafts and fixed roller shafts of the floating roller. For example, if the number of movable roller shafts and fixed roller shafts of the floating roller is 2 each, the film is wound around the floating roller up and down twice. At this time, n = 4.

[0089] If the distance between adjacent color marks on the first film is set as Lp, L = L1 - L0, the number of color mark intervals on the first film in the length of L is k, and the remaining length of the first film in the length of L except for the k color mark intervals is b, then the first moving distance can be further expressed as:

[0090] D1 = k × Lp + b - nΔx

[0091] As Figure 4 shown, when receiving the first color mark signal, the color mark sensor 119 is aligned with the color mark C on the first film, that is, the color mark sensor 119 detects the color mark signal. The number of color mark intervals in the length of L is k, and the remaining length of the first film in the length of L except for the k color mark intervals is b. Here, since the distance between adjacent color marks is equal and known, and L1 and L0 are also known, k and b can be obtained through simple calculations.

[0092] In step S4, the action time t for actuating the pinch roller can be obtained.

[0093] The actuation of the pinch roller 105 is performed by the pinch roller cylinder. However, since it takes a certain time for the cylinder of the pinch roller to receive the signal and actuate the pinch roller after the signal is sent (this time is the action time of the cylinder), during the process of high-speed film splicing, it is necessary to consider compensating for this action time. The action time of the pinch roller cylinder can be indirectly measured by the fact that the sudden change in tension caused by clamping the film during film splicing will cause the movement of the floating roller. For a packaging machine, the action time of the pinch roller cylinder is usually a known fixed value t. The action time of this cylinder can be input by the user into the PLC control system or pre-stored in the PLC control system.

[0094] In step S5, based on the first moving distance and the action time, the second film of the second film roll is sent into the gap of the pinch roller, and the cylinder actuates the pinch roller to reduce the gap to clamp the first film and the second film, thereby splicing the second film to the first film.

[0095] Specifically, according to the action time t and the speed of the first film moved by the power roller 109 (i.e., the rotational speed of the power roller), the predetermined length L2 of the first film moved within the action time t can be easily calculated. For a packaging machine, the rotational speed of its power roller is usually known.

[0096] Subtracting the predetermined length L2 that the first film moves within the operation time t from the first moving distance calculated above, the distance that the first film needs to move after considering the operation time t of the air cylinder can be obtained, that is, the second moving distance D2. Thus, the second moving distance can be expressed as follows:

[0097] D2 = D1 - L2 = k×Lp + b - nΔx - L2

[0098] Taking the time point when the roller shaft of the power roller 109 is in the second position as a reference, that is, taking the time point when the above first color mark signal is received as the starting point, the number k0 of color mark signals detected by the color mark sensor is obtained.

[0099] If Lp > nΔx, after k0 = k - 1, when the power roller 109 moves the first film another distance of Lp + b - nΔx - L2, the second film of the second film roll is fed into the gap of the pinch rollers, and the air cylinder actuates the pinch rollers to reduce the gap to clamp the first film and the second film, so as to connect the second film to the first film.

[0100] If Lp < nΔx, after k0 = k - 2, when the power roller 109 moves the first film another distance of 2Lp + b - nΔx - L2, the second film of the second film roll is fed into the gap of the pinch rollers, and the air cylinder actuates the pinch rollers to reduce the gap to clamp the first film and the second film, so as to connect the second film to the first film.

[0101] Thus, by simply counting the number of color marks detected by the color mark sensor and the limited length of the rotation of the power roller, the film connection timing can be accurately obtained.

[0102] After the second film of the second film roll is fed into the gap of the pinch rollers, the pinch rollers clamp the first film and the second film for a predetermined time, for example, at least 0.5 seconds, to ensure that the second film is firmly connected to the first film.

[0103] According to the film connection control method for a packaging machine of the present invention, taking the first color mark signal after the film is emptied as a reference, considering the influence of the floating roller movement and the operation time of the pinch roller air cylinder of the packaging machine, the accurate film connection timing is obtained, thereby improving the film connection accuracy, reducing the generation of waste film, and ensuring the production efficiency of the packaging machine.

[0104] According to another embodiment of the present invention, a film connection system is provided. Figure 5 The block diagram of the film connection system according to another embodiment of the present invention is shown.

[0105] As Figure 5 shown, the film connection system 2 according to another embodiment of the present invention includes a packaging machine 1 and a control system 3.

[0106] The packaging machine 1 can be according to Figure 1For the wrapping machine shown in the figure, to avoid the difficulty for those skilled in the art to understand the present invention due to excessive description, the wrapping machine 1 will not be specifically described hereinafter. Reference can be made to Figure 1 and its related description to understand the wrapping machine 1 in the film receiving system 2.

[0107] The control system 3 is communicatively connected to the wrapping machine 1. The control system 3 can be a programmable logic controller and is configured to execute any operation in the film receiving control method for the wrapping machine according to the embodiments of the present invention described above in combination with Figures 1 to 4 To avoid the difficulty for those skilled in the art to understand the present invention due to excessive description, the operations performed by the control system 3 will not be specifically described hereinafter. Reference can be made to Figures 1 to 4 and its related description to understand the various operations of the control system 3.

[0108] According to the film receiving system of the present invention, based on the first color mark signal after the film is emptied, considering the influence of the floating roller movement and the clamping roller cylinder action time of the wrapping machine, an accurate film receiving timing is obtained, thereby improving the film receiving accuracy, reducing the generation of waste film, and ensuring the production efficiency of the wrapping machine.

[0109] According to another embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, the control system is caused to execute the film receiving control method for the wrapping machine as described above.

[0110] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A film receiving control method for a packaging machine (1), the packaging machine comprising: A first reel (101) is sleeved with a first film roll (1011) used for packaging; a second reel (103) is arranged horizontally opposite to the first reel, and a second film roll (1031) identical to the first film roll is sleeved on the second reel; a clamping roller (105) is arranged below the middle of a line connecting the first reel to the second reel, the clamping roller having two rollers (1051, 1052) arranged opposite to each other, and a first film from the first film roll passes through a gap between the two rollers; a floating roller (107) comprises a movable roller shaft and a fixed roller shaft corresponding to the movable roller shaft, the floating roller being arranged A first film passing through the gap of the nip roller and being able to move up and down in a predetermined position range in a vertical direction is wound around the movable roller shaft and the fixed roller shaft of the floating roller below the nip roller; a power roller (109) configured to drive the first film wound around the movable roller shaft and the fixed roller shaft of the floating roller to move; and a color mark sensor (119) disposed downstream of the power roller and configured to detect a color mark on the first film moved by the power roller and provide a color mark signal when a color mark is detected, wherein the distance between two adjacent color marks on the first film is equal, and the method comprises: determining whether the first film in the first film roll has been emptied, and when determining that the first film in the first film roll has been emptied, recording a first height of the floating roller at a first predetermined position (xa) within the predetermined position range and a second height of the floating roller at a second predetermined position (xb) within the predetermined position range, wherein the first predetermined position is a position of the floating roller within the predetermined position range when the first film is emptied, and the second predetermined position is a lowermost position within the predetermined position range to which the floating roller moves downward after the first film is emptied; receiving a first color mark signal provided by the color mark sensor after the first film in the first film roll is emptied; Taking the position of the roller shaft of the power roller when the first color mark signal is received as a reference position, determining a first moving distance based on the difference between the first height and the second height and a first length of the first film between the clamping roller and the last color mark (C1) on the first film of the first film roll when the dancing roller is at the first predetermined position; Obtaining the action time to actuate the nip roller; and Based on the first moving distance and the action time, the second film of the second film roll is fed into the gap of the clamping rollers, and the clamping rollers are actuated to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

2. The method according to claim 1, wherein, Before determining whether the first film in the first film roll has been emptied, the method further includes: determining whether the diameter of the first film roll has reached a predetermined diameter, and when it is determined that the diameter of the first film roll has reached the predetermined diameter, moving the floating roller downward to the first predetermined position (xa) within the predetermined position range, wherein the predetermined diameter indicates that the first film in the first film roll is about to be emptied.

3. The method according to claim 1, wherein, Taking the position of the roller shaft of the power roller when the first color mark signal is received as the reference position, based on the difference between the first height and the second height and the first length of the first film between the pinch roller and the last color mark on the first film of the first film roll when the floating roller is in the first predetermined position, determining the first moving distance includes: When the first film in the first film roll is emptied and the floating roller is in the first predetermined position, recording the position of the roller shaft as the first position; and obtaining the first length of the first film when the roller shaft of the power roller is at the first position. When the first color mark signal is received, recording the position of the roller shaft of the power roller as the second position; and based on the first position and the second position, calculating the moving length of the first film moved by the power roller when rotating from the first position to the second position. Let the first length be L1, the moving length be L0, and the difference between the first height and the second height be Δx, then the first moving distance D1 = L1 - L0 - nΔx where n is a positive integer related to the number of movable roller shafts and fixed roller shafts of the floating roller.

4. The method according to claim 3, wherein, Based on the first moving distance and the action time, feeding the second film of the second film roll into the gap between the pinch rollers, actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film includes: Calculating a predetermined length of the first film moved within the action time according to the action time and the speed at which the power roller moves the first film; Subtracting the predetermined length from the first moving distance to obtain a second moving distance; When the power roller moves the first film by the second moving distance, feeding the second film of the second film roll into the gap between the pinch rollers, actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

5. The method according to claim 4, wherein, Let the distance between adjacent color marks on the first film be Lp, L = L1 - L0, the number of color mark intervals of the first film in the L length be k, and the remaining length of the first film in the L length except for k color mark intervals be b, then the first moving distance D1 = k×Lp + b - nΔx, Let the second moving distance be D2 and the predetermined length be L2, then the second moving distance D2 = D1 - L2 = k×Lp + b - nΔx - L2 Among them, when the power roller moves the first film by the second moving distance, feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, so as to connect the second film to the first film includes: Taking the time when the roller shaft of the power roller is in the second position as a reference, obtaining the number k0 of color mark signals detected by the color mark sensor; If Lp > nΔx, after k0 = k - 1, causing the power roller to move the first film by a distance of Lp + b - nΔx - L2, then feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, so as to connect the second film to the first film; and If Lp < nΔx, after k0 = k - 2, causing the power roller to move the first film by a distance of 2Lp + b - nΔx - L2, then feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, so as to connect the second film to the first film.

6. A film connecting system (2), comprising: A packaging machine (1), the packaging machine comprising: A first reel (101) sleeved with a first film roll (1011) for packaging; A second reel (103) oppositely arranged horizontally with the first reel, and a second film roll (1031) identical to the first film roll is sleeved on the second reel; Pinch rollers (105) arranged below the middle of the line connecting the first reel to the second reel, the pinch rollers having two relatively arranged rollers (1051, 1052), and the first film from the first film roll passes through the gap between the two rollers; A floating roller (107) comprising a movable roller shaft and a corresponding fixed roller shaft, the floating roller is arranged below the pinch rollers and can move up and down within a predetermined position range in the vertical direction, and the first film passing through the gap between the pinch rollers is wound around the movable roller shaft and the fixed roller shaft of the floating roller; A power roller (109) configured to be able to drive the first film wound around the movable roller shaft and the fixed roller shaft of the floating roller to move; and A color mark sensor (119) arranged downstream of the power roller, configured to detect color marks on the first film moved by the power roller and provide a color mark signal when a color mark is detected, wherein the distance between two adjacent color marks on the first film is equal, and A control system (3) communicatively connected to the packaging machine, the control system being configured to: determining whether the first film in the first film roll has been emptied, and when determining that the first film in the first film roll has been emptied, recording a first height of the floating roller at a first predetermined position (xa) within the predetermined position range and a second height of the floating roller at a second predetermined position (xb) within the predetermined position range, wherein the first predetermined position is a position of the floating roller within the predetermined position range when the first film is emptied, and the second predetermined position is a lowermost position within the predetermined position range to which the floating roller moves downward after the first film is emptied; receiving a first color mark signal provided by the color mark sensor after the first film in the first film roll is emptied; determining a first moving distance based on a position of the roller shaft of the power roller when the first color mark signal is received as a reference position, based on a difference between the first height and the second height and a first length of the first film between the clamping roller and a last color mark (C1) on the first film of the first film roll when the floating roller is at the first predetermined position; Obtaining the action time to actuate the nip roller; and Based on the first moving distance and the action time, the second film of the second film roll is fed into the gap of the clamping rollers, and the clamping rollers are actuated to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

7. The system according to claim 6, wherein, Taking the position of the roller shaft of the power roller when the first color mark signal is received as the reference position, determining the first moving distance based on the difference between the first height and the second height and the first length of the first film between the clamping roller and the last color mark on the first film of the first film roll when the dancing roller is at the first predetermined position includes: When the first film in the first film roll is emptied and the floating roller is at the first predetermined position, recording the position of the roller shaft of the power roller as the first position; and obtaining the first length of the first film when the roller shaft of the power roller is at the first position; When the first color mark signal is received, the position of the roller shaft of the power roller is recorded as the second position; and based on the first position and the second position, the moving length of the first film moved by the power roller when it rotates from the first position to the second position is calculated; Assume that the first length is L1, the moving length is L0, and the difference between the first height and the second height is Δx, then the first moving distance D1=L1-L0-nΔx Wherein, n is a positive integer related to the number of movable roller shafts and fixed roller shafts of the floating roller.

8. The system according to claim 7, wherein: Based on the first moving distance and the action time, feeding the second film of the second film roll into the gap between the clamping rollers, actuating the clamping rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film, comprises: Calculating a predetermined length of movement of the first film within the action time according to the action time and the speed at which the powered roller moves the first film; Subtract the predetermined length from the first moving distance to obtain a second moving distance; When the first film is moved by the power roller by the second moving distance, feed the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

9. The system according to claim 8, wherein Let the distance between adjacent color marks on the first film be Lp, L = L1 - L0, the number of color mark intervals of the first film in the length L be k, and the remaining length of the first film in the length L except for the k color mark intervals be b, then the first moving distance D1 = k×Lp + b - nΔx, Let the second moving distance be D2 and the predetermined length be L2, then the second moving distance D2 = D1 - L2 = k×Lp + b - nΔx - L2 wherein, when the first film is moved by the power roller by the second moving distance, feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film includes: Taking the time when the roller shaft of the power roller is in the second position as a reference, obtaining the number k0 of color mark signals detected by the color mark sensor; If Lp > nΔx, after k0 = k - 1, causing the power roller to move the first film by a further distance of Lp + b - nΔx - L2, then feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film; and If Lp < nΔx, after k0 = k - 2, causing the power roller to move the first film by a further distance of 2Lp + b - nΔx - L2, then feeding the second film of the second film roll into the gap between the pinch rollers, and actuating the pinch rollers to reduce the gap to clamp the first film and the second film, thereby connecting the second film to the first film.

10. A computer-readable storage medium having stored thereon a computer program which, when executed, causes a control system to perform the method according to any one of claims 1 to 5.

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