High-speed bag making machine

Abstract

The present invention discloses a high-speed bag-making machine, which includes a frame. A unwinding device, a winding device, a heat-sealing device and a cutting device located between the unwinding device and the winding device are provided on the frame. The heat-sealing device includes heat-sealing shafts rotatably installed oppositely on both sides of a plastic bag. A heat knife is provided on one of the heat-sealing shafts, and a heat-sealing pad for hot pressing by the heat knife is provided on the other heat-sealing shaft. The two heat-sealing shafts are connected to a heat-sealing driving device; the cutting device includes cutting shafts rotatably installed oppositely on both sides of the plastic bag. A cutting knife is provided on one of the cutting shafts, and a cutting pad for stabbing by the cutting knife is provided on the other cutting shaft. The two cutting shafts are connected to a cutting driving device; an out-bag control device is provided on the frame downstream of the heat-sealing device and the cutting device, and an in-bag control device is provided on the frame upstream of the heat-sealing device and the cutting device; a buffer assembly is provided on the bag-removing side of the in-bag control device on the frame. The heat-sealing and cutting efficiency of the present invention is high, and the overall bag-making efficiency is high.

Description

Technical Field

[0001] The present invention relates to a bag making machine. Background Art

[0002] Bag making machines are mainly used for continuous heat sealing and intermittent production of plastic bags. Their structure mainly includes a unwind device, a heat sealing device, an intermittent device, a winding device, etc. Among them, the heat sealing device and the intermittent device are the core parts of the bag making machine. At present, the above heat sealing and intermittent devices mostly adopt a vertical reciprocating structure to achieve. That is, when heat sealing or intermittent cutting, the heat knife or the intermittent cutting knife is driven to quickly act on the corresponding backing plate to achieve heat sealing or intermittent cutting; after heat sealing or intermittent cutting is completed, the heat knife or the intermittent cutting knife is quickly retracted, and the above actions are cycled in this way. In actual use, it is found that the efficiency of such heat sealing devices and intermittent devices is generally 220 - 230 times / min. For those with better performance tuning, the maximum can only reach 280 - 300 times / min. Limited by this efficiency, the bag making efficiency of existing bag making machines encounters a bottleneck and it is difficult to achieve further improvement.

[0003] After careful research on existing bag making machines by the inventor, it is found that the main reasons for the inability to improve the efficiency of existing heat sealing devices and intermittent devices are as follows: The heat knife or the intermittent cutting knife is driven to the corresponding backing plate for heat sealing or intermittent cutting. At the moment of heat sealing or intermittent cutting, the conveying of the plastic bag must have a short pause to ensure the quality of heat sealing or intermittent cutting; to improve the efficiency of heat sealing or intermittent cutting, existing bag making machines can only be achieved by increasing the conveying speed of the plastic bag between adjacent pauses; and increasing the conveying speed of the plastic bag means that the interval time between adjacent heat sealings or intermittent cuttings becomes shorter, that is, the action frequency of heat sealing or intermittent cutting becomes higher, but the reciprocating action ability of the guiding components (such as guide rods and guide sleeves, guide rails and slide seats) and the driving components (such as cylinders) in the reciprocating structure is limited, which restricts the realization of high-frequency heat sealing or intermittent cutting actions. Thus, existing bag making machines are affected by the pause of plastic bag conveying during heat sealing or intermittent cutting and the limitation of the reciprocating action ability of components in the reciprocating structure, making it impossible to further improve their efficiency.

[0004] In view of the above situation, the inventor has proposed a structure that can significantly improve the heat sealing and intermittent cutting efficiency, and at the same time has made adaptive improvements to other structures on the bag making machine to ultimately achieve the high-speed operation of the entire bag making machine, and thus the present invention is created. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-speed bag making machine with high heat sealing and intermittent cutting efficiency and high overall bag making efficiency.

[0006] To solve the above technical problems, the technical solution of the present invention is as follows: A high-speed bag-making machine, including a frame, on which a unwinding device, a winding device, a heat-sealing device and a perforating device located between the unwinding device and the winding device are provided. The heat-sealing device includes heat-sealing shafts rotatably installed oppositely on both sides of the plastic bag. A heat knife is provided on one of the heat-sealing shafts, and a heat-sealing pad for hot pressing the heat knife is provided on the other heat-sealing shaft. The two heat-sealing shafts are connected to a heat-sealing driving device; the perforating device includes perforating shafts rotatably installed oppositely on both sides of the plastic bag. A perforating knife is provided on one of the perforating shafts, and a perforating pad for stabbing the perforating knife is provided on the other perforating shaft. The two perforating shafts are connected to a perforating driving device; an out-bag control device is provided on the frame downstream of the heat-sealing device and the perforating device, and an in-bag control device is provided on the frame upstream of the heat-sealing device and the perforating device; a buffer assembly is provided on the bag-removing side of the in-bag control device on the frame.

[0007] As a preferred technical solution, the perforating shaft provided with the perforating knife is the main perforating shaft, and the perforating shaft provided with the perforating pad is the auxiliary perforating shaft; the perforating knife is radially slidably installed on the main perforating shaft, and a striker for perforating the perforating knife by hitting the perforating knife is installed on the frame. The striker is connected to a striking control device, and the perforating knife is connected to a retracting force applicator.

[0008] As a preferred technical solution, the striker includes a striking rotating shaft rotatably installed on the frame, a radially arranged striking rod is fixedly provided on the striking rotating shaft, and a striking portion capable of hitting the perforating knife is provided on the striking rod.

[0009] As a preferred technical solution, the striking control device includes a striking control disk fixedly provided on the main perforating shaft, a radially arranged striking transmission rod is fixedly provided on the striking rotating shaft, a striking reaction portion pressed against the outer peripheral surface of the striking control disk is provided on the striking transmission rod, and the striking transmission rod is connected to a pressing force applicator; a pulling bow slope for lifting the striking rod is provided on the outer peripheral surface of the striking control disk, and a hammer dropping break platform is provided at the end of the pulling bow slope.

[0010] As a preferred technical solution, the main perforating shaft also serves as the heat-sealing shaft provided with the heat knife, and the perforating pad also serves as the heat-sealing pad.

[0011] As a preferred technical solution, the unwinding device includes an unwinding frame swingably installed on the frame. Two bag roll support platforms for respectively supporting both ends of the plastic bag roll are provided on the unwinding frame. An unwinding driving roller for the plastic bag roll to abut against is provided on the frame, and the unwinding driving roller is connected to an unwinding driver; a swing angle control cylinder is provided between the unwinding frame and the frame.

[0012] As a preferred technical solution, a pay-off support table is fixedly arranged on the control end of the swing angle control cylinder, an elastic holder is arranged on the pay-off support table, and a holding part located at the holding end of the elastic holder is arranged on the pay-off rack.

[0013] As a preferred technical solution, a bag roll positioning rack is arranged on the bag roll support table, and bag roll positioning gears which are constantly meshed with the corresponding bag roll positioning racks are respectively fixedly arranged at both ends of the reel of the plastic bag roll.

[0014] As a preferred technical solution, a bag feeding deviation adjusting device and a bag feeding buffer device are arranged on the machine frame between the pay-off device and the bag feeding control device.

[0015] As a preferred technical solution, a bag discharging buffer device and a bag discharging deviation adjusting device are arranged on the machine frame between the bag discharging control device and the rewinding device.

[0016] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0017] (1) The present invention replaces the existing vertical reciprocating mode with a rotating mode. When the hot knife and the perforating knife rotate to near the point together with the corresponding pad, there is a linear velocity in the same direction as the conveying of the plastic bag. The plastic bag can realize the heat sealing and perforating actions without pausing. And the above-mentioned linear velocity brought by rotation is easy to match the continuous conveying of the plastic bag to achieve the purpose of high-speed operation. Therefore, the present invention can eliminate the influence of pauses during heat sealing or perforating and the limitation of the action ability of components, and significantly improve the heat sealing and perforating efficiency.

[0018] (2) A bag discharging control device with active output is arranged downstream of the heat sealing and perforating, and a bag feeding control device with active input is arranged upstream of the heat sealing and perforating, so that the heat sealing and perforating processes form relatively independent action segments, and the influence of the pay-off and rewinding on their action efficiency is reduced. In addition, the buffer assembly also avoids the situation of pulling the plastic bag between the two, and the heat sealing and perforating can be smoothly and efficiently operated, which can easily cooperate with the high speed of the pay-off and rewinding, and significantly improve the overall bag-making efficiency of the bag-making machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0020] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0021] Figure 2 is Figure 1 the enlarged structural schematic diagram at the perforating device in the middle point;

[0022] Figure 3 is Figure 2Schematic diagram of the A-A structure;

[0023] Figure 4 is Figure 3 Schematic diagram of the B-B structure;

[0024] Figure 5 is Figure 3 Schematic diagram of the C-direction structure;

[0025] Figure 6 is Figure 1 Enlarged schematic diagram of the structure at the unwinding device;

[0026] Figure 7 is Figure 6 Non-sectional schematic diagram;

[0027] Figure 8 is Figure 7 Enlarged schematic diagram of the structure at position D in

[0028] In the figure: 1 - Frame;

[0029] 2 - Unwinding device; 21 - Unwinding rack; 22 - Bag roll support table; 221 - Bag roll positioning rack; 222 - Bag roll positioning gear; 23 - Unwinding driving roller; 24 - Swing angle control cylinder; 25 - Unwinding support table; 26 - Elastic support; 261 - Telescopic rod; 262 - Support spring; 263 - Support part; 27 - Anti-detachment bar;

[0030] 3 - Heat-sealing device; 31 - Heat knife;

[0031] 4 - Perforating device; 41 - Perforating shaft; 411 - Perforating main shaft; 412 - Perforating auxiliary shaft; 42 - Perforating knife; 43 - Perforating pressure plate; 44 - Perforating pad; 45 - Slide bar; 451 - Impact part; 46 - Impact device; 461 - Impact rotating shaft; 462 - Impact rod; 463 - Impact part; 47 - Impact control device; 471 - Impact control disc; 472 - Impact transmission rod; 473 - Impact reaction part; 474 - Pressing force applicator; 475 - Drawbow slope; 476 - Hammer-breaking platform; 48 - Knife-retracting force applicator; 49 - Counterweight;

[0032] 5 - Rewinding device;

[0033] 61 - Bag-out control device; 62 - Bag-in control device; 63 - Buffer assembly; 631 - Hanging bag space; 632 - Bag support table; 633 - Bag guiding device;

[0034] 71 - Bag-in deviation adjustment device; 72 - Bag-in buffer device; 73 - Bag tail fixing device; 74 - Heat-sealing connection device;

[0035] 81 - Bag-out deviation adjustment device; 82 - Bag-out buffer device;

[0036] 9 - Plastic bag; 91 - Roll of plastic bags. Detailed implementation mode

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only the exemplary embodiments of the present invention are described by way of illustration. It goes without saying that those of ordinary skill in the art can recognize that, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the accompanying drawings and the description are illustrative in nature and are not used to limit the scope of protection of the claims.

[0038] As Figures 1 to 8 As commonly shown, a high - speed bag - making machine includes a frame 1. A unwind device 2, a winding device 5, a heat - sealing device 3 and a perforating device 4 are provided on the frame 1 between the unwind device 2 and the winding device 5. Among them, the winding device 5 is used to wind the plastic bags 9 after heat - sealing and perforating into a core - type or core - less finished bag roll with a fixed number of plastic bags 9. Its structural principle is well - known to those skilled in the art and will not be elaborated here.

[0039] The unwind device 2 is used to continuously unwind the plastic bags 9 from a large roll of plastic bag roll 91 for use. The unwind device 2 includes an unwind frame 21 swing - mounted on the frame 1. Two bag - roll support platforms 22 for respectively supporting both ends of the reel of the plastic bag roll 91 are provided on the unwind frame 21. A unwind driving roller 23 for the plastic bag roll 91 to abut against is provided on the frame 1, and the unwind driving roller 23 is connected with an unwind driver; A swing - angle control cylinder 24 is provided between the unwind frame 21 and the frame 1.

[0040] By driving the unwind frame 21 to swing through the swing - angle control cylinder 24, a certain slope is formed on the bag - roll support platform 22. This slope enables the plastic bag roll 91 to automatically abut against the unwind driving roller 23. Relying on the rotation of the unwind driving roller 23, the plastic bag roll 91 is driven to rotate, realizing the continuous unwinding of the plastic bags 9 in the plastic bag roll 91. As the plastic bags 9 are continuously unwound, the diameter of the plastic bag roll 91 becomes smaller and smaller. The plastic bag roll 91 can still roll by itself relying on the slope of the bag - roll support platform 22 to always maintain the state of being in contact with the unwind driving roller 23, ensuring the continuous and effective unwinding of the plastic bags 9.

[0041] A bag - roll positioning rack 221 is provided on the bag - roll support platform 22 in this embodiment. Bag - roll positioning gears 222 that are constantly engaged with the corresponding bag - roll positioning racks 221 are respectively fixed at both ends of the reel of the plastic bag roll 91. Through the meshing action of the gears and racks at both ends, the reel of the plastic bag roll 91 is always kept parallel to the unwind driving roller 23, thereby avoiding the influence of the deviation of the plastic bag roll 91 and other factors on the attitude of the output plastic bags 9.

[0042] Preferably, a unwind support table 25 is fixedly provided on the control end of the swing angle control cylinder 24. An elastic holder 26 is provided on the unwind support table 25, and a holding part 263 located at the holding end of the elastic holder 26 is provided on the unwind rack 21. After the plastic bag rolls 91 are placed on the two bag roll support tables 22, due to the gravity of the plastic bag rolls 91, the elastic holder 26 is compressed by a large length. As the plastic bag 9 is continuously unwound, the plastic bag rolls 91 also become lighter in weight. The elastic holder 26 can slowly lift the plastic bag rolls 91 with decreasing weight. During the slow lifting process, the unwind rack 21 simultaneously makes a movement with an increasingly larger swing angle, and the slope of the bag roll support table 22 thereon also gradually increases. Thus, without adjusting the swing angle control cylinder 24, the bag roll support table 22 can utilize the gradually increasing slope to keep the pressing component force of the gravity of the plastic bag rolls 91 towards the unwind driving roller 23 relatively stable, thereby further ensuring that the plastic bag 9 can be continuously and effectively unwound.

[0043] The elastic holder 26 in this embodiment includes a telescopic rod 261 provided on the unwind support table 25. A holding spring 262 is sleeved outside the telescopic rod 261. Guided by the telescopic rod 261, the effective holding of the elastic holder 26 is ensured, and then the elastic holding force is provided by the holding spring 262. Although this embodiment is illustrated with a compression spring structure, in actual application, it can be equivalently transformed into a tension spring or the like. In addition, an anti - detachment stop strip 27 is provided on the unwind rack 21 at one end of the bag roll support table 22 close to the unwind driving roller 23 to prevent the reel end of the plastic bag rolls 91 from detaching from the bag roll support table 22. Especially when the slope of the bag roll support table 22 is getting larger and larger, this anti - detachment effect is particularly significant.

[0044] The heat - sealing device 3 in this embodiment includes heat - sealing shafts rotatably installed opposite to each other on both sides of the plastic bag 9. A heat - sealing knife 31 is provided on one of the heat - sealing shafts, and a heat - sealing pad for hot - pressing the heat - sealing knife 31 is provided on the other heat - sealing shaft. The two heat - sealing shafts are connected with a heat - sealing driving device. When the heat - sealing knife 31 and the heat - sealing pad rotate to the nearest point, the heat - sealing knife 31 hot - presses onto the heat - sealing pad to complete the heat - sealing action. Among them, the above - mentioned nearest point is the position where the heat - sealing knife 31 and the heat - sealing pad are both on the center line of the two heat - sealing shafts and between the two heat - sealing shafts at the same time. To ensure that the heat - sealing knife 31 and the heat - sealing pad can rotate to the nearest point simultaneously, the two heat - sealing shafts can be driven to rotate with the same angular velocity relatively through a toothed belt or a gear drive, that is, the heat - sealing driving device includes a heat - sealing driving motor cooperating with a toothed - belt or gear - drive structure.

[0045] The described perforating device 4 includes perforating shafts 41 rotatably installed oppositely on both sides of the plastic bag 9. A perforating knife 42 is provided on one of the perforating shafts 41, and a perforating pad 44 for the perforating knife 42 to pierce is provided on the other perforating shaft 41. The two perforating shafts 41 are connected to a perforating driving device. When the perforating knife 42 and the perforating pad 44 rotate to the proximity point, the piercing of the perforating knife 42 into the perforating pad 44 can complete the perforating action. Similarly, the perforating driving device can also adopt a method including a perforating driving motor cooperating with a toothed belt or gear transmission to achieve the same angular velocity rotation of the two perforating shafts 41 relative to each other. Here, in this embodiment, the toothed belt transmission is used for illustration. Conventionally, the perforating pad 44 is provided with perforating avoidance grooves corresponding to the cutting edges of the perforating knife 42.

[0046] In this embodiment, the perforating shaft 41 of the perforating knife 42 is set as the main perforating shaft 411, and the perforating shaft 41 of the perforating pad 44 is set as the auxiliary perforating shaft 412. Preferably, the main perforating shaft 411 also serves as the heat-sealing shaft for setting the heat knife 31, and the perforating pad 44 also serves as the heat-sealing pad, that is, the auxiliary perforating shaft 412 is also set as the heat-sealing shaft for setting the heat-sealing pad. In this way, it is equivalent to integrally setting the heat-sealing device 3 and the perforating device 4, and the heat-sealing and perforating actions can be synchronously completed during rotation. Of course, in actual setting, the heat-sealing device 3 and the perforating device 4 can also be separately set, and when separately set, the sequence is not limited.

[0047] Preferably, the perforating knife 42 is radially slidably installed on the main perforating shaft 411. A striker 46 for perforating the perforating knife 42 by striking is installed on the frame 1. The striker 46 is connected to a striking control device 47, and the perforating knife 42 is connected to a retracting force applicator 48. Among them, the sliding installation of the perforating knife 42 in this embodiment is achieved by opening a sliding hole on the main perforating shaft 411 and connecting a sliding rod 45 passing through the sliding hole on the perforating knife 42.

[0048] When the perforating knife 42 and the perforating pad 44 rotate to the proximity point, the striking control device 47 controls the striker 46 to strike the perforating knife 42, causing the perforating knife 42 to instantaneously pierce into the perforating pad 44 to achieve perforation. After perforation, the retracting force applicator 48 drives the perforating knife 42 to retract to quickly avoid the plastic bag 9 and does not affect the continuous conveyance of the plastic bag 9. Among them, on the main perforating shaft 411 in this embodiment, perforating pressure plates 43 are respectively fixedly provided on both sides of the perforating knife 42 to, during perforation, press both sides of the position of the plastic bag 9 to be perforated onto the perforating pad 44 to further ensure effective perforation.

[0049] The striker 46 includes a striking rotating shaft 461 rotatably mounted on the frame 1. A radially arranged striking rod 462 is fixedly provided on the striking rotating shaft 461. A striking portion 463 capable of striking the break-off knife 42 is provided on the striking rod 462. Of course, a struck portion 451 corresponding to the striking portion 463 is provided on the break-off knife 42. The struck portion 451 can be the body of the break-off knife 42 or a structure fixedly provided on the break-off knife 42. In this embodiment, since the break-off knife 42 is slidably mounted by a slide rod 45 penetrating the break-off main shaft 411, the other end of the slide rod 45 extending out of the break-off main shaft 411 serves as the struck portion 451, which facilitates striking at a position far from the break-off main shaft 411 and avoids structural interference. Preferably, the striking portion 463 is implemented by a rotatable structure such as a roller or a bearing, which can avoid generating resistance to the break-off main shaft 411 during the striking process. In this embodiment, the struck portion 451 can be implemented by a plastic structure to reduce the striking noise. Of course, a rotatable structure such as a roller or a bearing can also be used. Similarly, due to the slide rod 45 sliding structure of the break-off knife 42, in this embodiment, the retracting force applicator 48 includes a retracting spring sleeved on the part of the slide rod 45 extending out of the break-off main shaft 411.

[0050] The striking control device 47 includes a striking control disc 471 fixedly provided on the break-off main shaft 411. A radially arranged striking transmission rod 472 is fixedly provided on the striking rotating shaft 461. A striking reaction portion 473 pressing against the outer peripheral surface of the striking control disc 471 is provided on the striking transmission rod 472. The striking transmission rod 472 is connected with a pressing force applicator 474. A bow-pulling slope 475 for propping up the striking rod 462 is provided on the outer peripheral surface of the striking control disc 471. A hammer-drop break platform 476 is provided at the end of the bow-pulling slope 475.

[0051] When the striking control disc 471 rotates with the break-off main shaft 411, the striking reaction portion 473 always presses against the outer peripheral surface of the striking control disc 471. Before the break-off knife 42 rotates to the near point, the striking reaction portion 473 begins to press against the bow-pulling slope 475 to lift the striking portion 463. When the break-off knife 42 rotates to the near point, under the action of the pressing force applicator 474, the striking reaction portion 473 instantaneously drops from the hammer-drop break platform 476, and the striking portion 463 that has been lifted to a certain height simultaneously strikes the struck portion 451. After the break-off main shaft 411 continues to rotate, the struck portion 451 leaves the striking portion 463, and the retracting force applicator 48 drives the break-off knife 42 to quickly retract, and the quick break-off action is completed.

[0052] In this embodiment, the striking control disk 471 is disposed on the point breaking spindle 411, and the striking control disk 471 can rotate at the same angular velocity as the point breaking spindle 411, so that it is easy to coordinate the rotation position of the point breaking knife 42 to set the position of the bow drawing slope 475 and the hammer breaking platform 476. Of course, the striking control disk 471 can also be disposed on other rotating shafts that are transmission-connected to the point breaking spindle 411 to perform point breaking control.

[0053] In addition, in actual use, the point breaking main shaft 411 is fixedly provided with a counterweight 49 on the opposite side of the point breaking knife 42 and the hot knife 31, and the point breaking secondary shaft 412 is fixedly provided with a counterweight 49 on the opposite side of the point breaking pad 44 to reduce rotational vibration and ensure smooth and rapid rotation. Of course, in this embodiment, two groups of point breaking knives 42 and hot knives 31 can be centrally symmetrically provided on the point breaking main shaft 411, and two point breaking pads 44 can be centrally symmetrically provided on the point breaking secondary shaft 412, so that one rotation of the point breaking shaft 41 is equivalent to two heat sealing and point breaking operations, so that it is easy to cooperate with a faster conveying speed of the plastic bag 9 to perform heat sealing and point breaking operations.

[0054] A bag-discharging control device 61 is provided on the frame 1 downstream of the heat-sealing device 3 and the point-breaking device 4, and a bag-feeding control device 62 is provided on the frame 1 upstream of the heat-sealing device 3 and the point-breaking device 4. By setting the bag-discharging control device 61 and the bag-feeding control device 62, the heat-sealing device 3 and the point-breaking device 4 in this embodiment can form relatively independent action sections, and the influence of unwinding and rewinding on their action efficiency is reduced, and heat sealing and point-breaking can easily and stably achieve efficient operation. Among them, the bag-discharging control device 61 and the bag-feeding control device 62 can be realized by a pair of rollers and a motor.

[0055] A buffer assembly 63 is provided on the bagging frame 1 on the bag-removing side of the bagging control device 62. The buffer assembly 63 can prevent the plastic bag 9 from being pulled between the bag-out control device 61 and the bagging control device 62, further ensuring the smooth and efficient operation of heat sealing and cutting. In this embodiment, the buffer assembly 63 includes a hanging bag space 631 provided on the bag-removing side of the bagging control device 62. A hanging bag sensor is provided at the hanging bag space 631. A bag supporting table 632 is provided on the bagging frame 1 on the bag-removing side of the hanging bag space 631. A bag smoothing device 633 that is flexibly pressed against the plastic bag 9 is provided on the bag supporting table 632. A certain length of the plastic bag 9 naturally hangs down through the hanging bag space 631 to prevent the plastic bag 9 from being pulled between the bagging control device 62 and the bag-out control device 61, so as to avoid the situation of pulling open the plastic bag 9. Before the hanging plastic bag 9 enters heat sealing and cutting, it is smoothed on the bag supporting table 632 by the bag smoothing device 633 to ensure the smooth and reliable progress of heat sealing and cutting. In this embodiment, the bag smoothing device 633 can be realized by a horizontally placed spring, or some flexible sheet materials, flexible curtains, etc.

[0056] An in-bag deviation adjusting device 71 and an in-bag buffer device 72 are provided on the bagging frame 1 between the unwinding device 2 and the bagging control device 62. The in-bag deviation adjusting device 71 is used to enable the plastic bag 9 to reach the cutting device 4 and the heat sealing device 3 in the correct posture, ensuring the quality of cutting and heat sealing; its structural principle is well known to those skilled in the art and will not be elaborated here. The in-bag buffer device 72 is used to buffer the entry of the plastic bag 9. Conventionally, it forms an S-shaped walking path for the plastic bag 9 by arranging a plurality of buffer moving rollers on a floating frame and a plurality of buffer fixed rollers on the bagging frame 1, and realizes the buffering of the plastic bag 9 through the floating and sinking of the floating frame. This is a conventional technology and will not be elaborated here.

[0057] An out-bag buffer device 82 and an out-bag deviation adjusting device 81 are provided on the bagging frame 1 between the bag-out control device 61 and the winding device 5. An out-bag buffer device 82 and an out-bag deviation adjusting device 81 are provided on the bagging frame 1 between the bag-out control device 61 and the winding device 5. The out-bag buffer device 82 and the out-bag deviation adjusting device 81 are used to cooperate with the plastic bag 9 output by heat sealing and cutting so that it can be smoothly wound by the winding device 5. The structural principles of both are similar to those of the in-bag deviation adjusting device 71 and the in-bag buffer device 72, and are also well known to those skilled in the art and will not be elaborated here.

[0058] In this embodiment, both heat sealing and intermittent cutting are achieved in a rotational manner. Compared with the existing vertical reciprocating manner, when the heat knife 31, the intermittent cutting knife 42, and the intermittent cutting pad 44 rotate to the vicinity of the point, all three have a linear velocity in the same direction as the conveyance of the plastic bag 9. The plastic bag 9 can complete the heat sealing and intermittent cutting actions without pausing. Moreover, the above-mentioned linear velocity brought by rotation is easily matched with the continuous conveyance of the plastic bag 9 to achieve the purpose of high-speed operation. Therefore, this embodiment can eliminate the influence of pauses during heat sealing or intermittent cutting and the limitation of the movement ability of components, significantly improving the efficiency of heat sealing and intermittent cutting.

[0059] In this embodiment, through the striking setting at the moment of intermittent cutting, firstly, effective intermittent cutting can be achieved to ensure the quality of intermittent cutting; secondly, the intermittent cutting knife 42 can be prevented from tearing the plastic bag 9; thirdly, the rapid forward and backward movement of intermittent cutting can be realized without affecting the continuous conveyance of the plastic bag 9. Moreover, the structures of the striker 46 and the striking control device 47 in this embodiment are easily adapted to the high-speed operation of heat sealing and intermittent cutting for use, without performance limitation problems. Therefore, while effectively ensuring the improvement of the efficiency of heat sealing and intermittent cutting in this embodiment, beneficial effects such as good quality of intermittent cutting are also achieved.

[0060] This embodiment relies on the bag discharging control device 61 and the bag feeding control device 62 to separate the heat sealing and intermittent cutting processes into relatively independent action segments, reducing the influence of unwinding and winding on their action efficiency. In addition, the buffer assembly 63 also avoids the situation of pulling the plastic bag 9 between the two. Heat sealing and intermittent cutting can be smoothly and efficiently carried out, which can easily cooperate with the high speed of unwinding and winding, significantly improving the overall bag-making efficiency of the bag-making machine.

[0061] In summary, in this embodiment, through the unwind device 2 with optimized structure, it is ensured that the plastic bag 9 is continuously and effectively discharged. During the bag feeding and discharging of heat sealing and intermittent cutting, through bag feeding buffering, it is ensured that heat sealing and intermittent cutting are carried out smoothly and at high speed, and the plastic bag 9 is smoothly output after heat sealing and intermittent cutting. Before bag feeding and after bag discharging, through deviation adjustment and buffering, the unwind device 2 and the winding device 5 are respectively connected in series, enabling this embodiment to form a high-speed bag-making operation of continuous unwinding, continuous heat sealing and intermittent cutting, and continuous winding, with an operation efficiency of up to 400 bags / min.

[0062] In addition to the above-mentioned continuous high-speed operation, when a plastic bag roll 91 has finished unwinding, in order to improve the good connection between the tail of the used plastic bag roll 91 and the head of the new plastic bag roll 91, a tail fixing device 73 and a heat-sealing connection device 74 are added in this embodiment. Among them, the tail fixing device 73 is used to fix the tail of the used plastic bag roll 91 to avoid the situation that the plastic bag 9 in the whole production line is too loose due to the lack of traction of the unwinding device 2. Preferably, the tail fixing device 73 is arranged on the incoming bag side of the incoming bag buffer device 72, that is, the tail fixing device 73 is provided on the incoming bag side of the incoming bag buffer device 72; in this way, when the head of the new plastic bag roll 91 is connected to the tail of the used plastic bag roll 91, it is no longer necessary to wind around the S path at the incoming bag buffer device 72 in a cumbersome way, which is beneficial to improving the replacement efficiency of the plastic bag roll 91. The tail fixing device 73 can be realized by pressing against one of the guide rollers of the plastic bag 9, and the start of its pressing action can be realized by sensing the released plastic bag 9 at the unwinding device 2.

[0063] The heat-sealing connection device 74 is used to heat-seal and connect the tail of the used plastic bag roll 91 and the head of the new plastic bag roll 91, so as to quickly form a continuous plastic bag 9 between the two plastic bag rolls 91. Preferably, the heat-sealing connection device 74 is arranged on the incoming bag side of the tail fixing device 73; it can adopt a structure similar to that of the heat-sealing device 3, that is, by using the way of hot pressing the heat-sealing knife onto the heat-sealing pad to realize the heat-sealing connection. Through the setting of the tail fixing device 73 and the heat-sealing connection device 74, the replacement of the plastic bag roll 91 is also very convenient and fast, which is beneficial to cooperating with the continuous high-speed operation of bag making and forming efficient production as a whole.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. High-speed bag-making machine, comprising a frame, wherein a unwinding device, a winding device, a heat-sealing device and a perforating device located between the unwinding device and the winding device are provided on the frame, and it is characterized in that: The heat-sealing device includes heat-sealing shafts rotatably installed oppositely on two sides of the plastic bag. A heat knife is provided on one of the heat-sealing shafts, and a heat-sealing pad for hot-pressing the heat knife is provided on the other heat-sealing shaft. The two heat-sealing shafts are connected to a heat-sealing driving device; the perforating device includes perforating shafts rotatably installed oppositely on two sides of the plastic bag. A perforating knife is provided on one of the perforating shafts, and a perforating pad for stabbing the perforating knife is provided on the other perforating shaft. The two perforating shafts are connected to a perforating driving device; an out-bag control device is provided on the machine frame downstream of the heat-sealing device and the perforating device, and an in-bag control device is provided on the machine frame upstream of the heat-sealing device and the perforating device; a buffer assembly is provided on the machine frame on the bag-removing side of the in-bag control device; The perforating shaft provided with the perforating knife is the main perforating shaft, and the perforating shaft provided with the perforating pad is the secondary perforating shaft; the perforating knife is radially slidably installed on the main perforating shaft. A striker for perforating the perforating knife by striking is installed on the machine frame. The striker is connected to a striking control device, and the perforating knife is connected to a retracting force applicator; The striker includes a striking rotating shaft rotatably installed on the machine frame. A radially arranged striking rod is fixed on the striking rotating shaft, and a striking portion for striking the perforating knife is provided on the striking rod; The striking control device includes a striking control disk fixedly provided on the main perforating shaft. A radially arranged striking transmission rod is fixed on the striking rotating shaft. A striking reaction portion pressed against the outer peripheral surface of the striking control disk is provided on the striking transmission rod. The striking transmission rod is connected to a pressing force applicator; a bow-pulling slope for lifting the striking rod is provided on the outer peripheral surface of the striking control disk, and a hammer-falling break platform is provided at the end of the bow-pulling slope.

2. The high-speed bag-making machine according to claim 1, characterized in that: The main perforating shaft also serves as the heat-sealing shaft provided with the heat knife, and the perforating pad also serves as the heat-sealing pad.

3. The high-speed bag-making machine according to claim 1, wherein: The unwinding device includes an unwinding frame swingably installed on the machine frame. Two bag-roll supporting platforms for supporting both ends of the plastic bag roll are provided on the unwinding frame. An unwinding driving roller for the plastic bag roll to abut against is provided on the machine frame. The unwinding driving roller is connected to an unwinding driver; a swing angle control cylinder is provided between the unwinding frame and the machine frame.

4. The high-speed bag-making machine according to claim 3, wherein: A release support platform is fixedly provided on the control end of the swing angle control cylinder. An elastic support is provided on the release support platform. A support portion is provided on the unwinding frame at the support end of the elastic support.

5. The high-speed bag-making machine according to claim 3, characterized in that: Bag-roll positioning racks are provided on the bag-roll supporting platforms. Bag-roll positioning gears constantly meshing with the corresponding bag-roll positioning racks are respectively fixed at both ends of the reel of the plastic bag roll.

6. The high-speed bag-making machine according to claim 1, wherein: An in-bag deviation adjustment device and an in-bag buffer device are provided on the machine frame between the unwinding device and the in-bag control device.

7. The high-speed bag-making machine according to claim 1, characterized in that: An out-bag buffer device and an out-bag deviation adjustment device are provided on the machine frame between the out-bag control device and the winding device.

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