A kind of hot pressing bag equipment for packaging bags

Abstract

The present invention discloses a hot pressing bag device for packaging bags, which relates to packaging bag production and aims to solve the problem of the lack of a device for directly processing plastic bag films in the prior art. The key points of the technical solution are: a hot pressing bag device for packaging bags, including a feeding device, a stripping device, a punching mechanism, a cutting mechanism, a traction mechanism, a hot pressing cutting device and a feeding mechanism; the stripping device includes an upward guide frame, a guide roller, a material pulling mechanism and a cutting and rolling mechanism; the cutting mechanism includes a cutting support roller, a toothed blade disc and a cutting motor; the hot pressing cutting device includes a heat sealing mechanism, a cutting mechanism, a crankshaft transmission mechanism and an AC motor. The hot pressing bag device for packaging bags of the present invention has the functions of stripping, punching, cutting and heat sealing and cutting, so that a single device can produce the technical effect of the packaging bags disclosed in the background technology, and effectively improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to packaging bag production, and more particularly to a hot pressing bag device for packaging bags. Background Art

[0002] Packaging bags are containers for placing items, such as Fig.13 , Fig.14 The figure shows a packaging bag widely used in American supermarkets for packaging bulk fruits, which includes a middle strip 91 and bag bodies 92 arranged on both sides of the middle strip 91. The two bag bodies 92 have openings 93. One side of the opening 93 is connected to the middle strip 91 and is provided with a tear mark 94. The opening 93 is also provided with a sealing strip 95. The middle strip 91 is also provided with three through holes 96.

[0003] When the above-mentioned packaging bags are actually used in supermarkets, a rack is set up in the supermarket to hang the bag body by inserting it into the through hole 96. At the same time, multiple packaging bags are stacked in sequence from bottom to top. The opening of the bag body 92 at the top is not connected to one side of the middle strip 91. It is naturally drooping due to the effect of gravity, so that the opening 93 of the bag body 92 is partially opened, thereby providing convenience for customers to place items.

[0004] The production process of plastic packaging bags in the prior art generally includes: film blowing, that is, using a film blowing machine to make the hot-melt plastic masterbatch into a film to be processed for packaging bags; heat sealing, that is, using a hot pressing device to heat-press the film to be processed for packaging bags to form independent packaging bag bodies; cutting, that is, using a cutter to cut and separate the independent bag bodies after completing the heat sealing.

[0005] like Fig.15 , Fig.16 The plastic bag film 97 after film blowing is shown. To facilitate the subsequent process of loading, the plastic bag film 97 is generally wound around the material tray 13 (marked at Figure 1 ) above; the prior art lacks a hot pressing bag device that can directly process the plastic bag film 97 to produce the above-mentioned packaging bag, and requires multiple devices to work together, which leads to the need for repeated loading and unloading, affecting production efficiency; therefore, it is necessary to propose a new solution to solve this problem. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a hot pressing bag equipment for packaging bags, which is equipped with waste strips, punching, cutting and heat sealing, so that a single device can produce the technical effect of the packaging bags disclosed in the background technology, effectively improving production efficiency.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a hot pressing bag equipment for packaging bags, including a feeding device, a stripping device, a punching mechanism, a cutting mechanism, a traction mechanism, a hot pressing cutting device and a feeding mechanism; the stripping device includes an upper guide frame, a plurality of guide rollers rotatably connected to the upper guide frame, a pulling mechanism arranged on the upper guide frame, and a cutting and rolling mechanism arranged on the upper guide frame, the pulling mechanism includes a pulling roller rotatably connected to the upper guide frame, a pulling pressure roller with a gap fitted with the pulling roller, and a pulling motor for driving the pulling roller, The roll cutting mechanism includes a roll cutting arm, a cutter that is gap-matched with a guide roller, a coiling disc that is detachably and rotatably connected to the roll cutting arm, and a coiling motor for driving the coiling disc; the hot pressing bag equipment also includes a main frame, and the cutting mechanism includes a cutting support roller that is rotatably connected to the main frame, two toothed blade discs that are tangential to the cutting support rollers, and two cutting motors that are respectively used to drive the toothed blade discs; the hot pressing cutting device includes a heat sealing mechanism and a cutting mechanism that move longitudinally, a crankshaft transmission mechanism arranged between the heat sealing mechanism and the cutting mechanism, and an AC motor for driving the crankshaft transmission mechanism.

[0008] By adopting the above technical scheme, the present invention releases the plastic bag film at a uniform speed from the feeding device during normal operation, and the released plastic bag film enters the stripping device, and the pulling motor drives the pulling roller and cooperates with the pulling pressure roller to pull the plastic bag film, forcing it to move forward along the guide track formed by multiple guide rollers. When it moves to the cutting and rolling mechanism, the winding motor drives the winding disc to rotate, thereby generating a pulling force on the waste material to be cut off, and cooperates with the advancement of the main body of the plastic bag film. After the plastic bag film is cut by the cutter, the technical effect of cutting the waste material from the main body of the plastic bag film is achieved; after the waste material is cut off, the plastic bag film is pulled forward by the traction force of the traction mechanism and passes through the punching mechanism and the cutting mechanism in turn. In the process of the plastic bag film passing through the punching mechanism, the punching mechanism completes the punching of the through hole on the middle strip, and in the process of the plastic bag film passing through the cutting mechanism, the cutting motor drives the toothed blade disc to rotate, and the toothed blade The cutter disc cooperates with the cutting support roller during rotation to cut two long tooth-shaped cutting marks on the plastic bag film, that is, the tear marks after bag making are completed; after the setting of the cutting marks is completed, the plastic bag film is sent to the hot pressing and cutting device by the traction mechanism, and the plastic bag film entering the hot pressing and cutting device begins to be transported by the unloading mechanism. During the transportation process, the AC motor is driven by the crankshaft transmission mechanism to drive the heat sealing mechanism and the cutting mechanism to perform reciprocating longitudinal motion, so that the heat sealing mechanism completes the side sealing of the packaging bag, and the cutting mechanism completes the cutting after the side sealing is completed, so that the packaging bag is separated from the plastic bag film, and finally the unloading mechanism transports the packaging bag to the unloading end, and the worker can take the packaging bag off; in summary, the present invention simultaneously has waste stripping, punching, cutting and heat sealing and cutting, so that a single device can produce the technical effect of the packaging bag disclosed in the background technology, and effectively improves production efficiency.

[0009] The present invention is further configured as follows: the loading device includes a loading rack, two connecting flanges connected to the loading rack for relative rotation, a material tray detachably and coaxially fixed to the connecting flanges, and a loading motor for driving one of the connecting flanges to rotate, and material tray flanges are respectively provided at the centers of both ends of the material tray, and the connecting flanges are provided with semicircular support arcs for supporting the material tray flanges.

[0010] By adopting the above technical solution, the material tray can be detachably and rotatably installed on the loading rack through the cooperation of two material tray flanges and the connecting flange, and the loading motor is used to drive one of the material tray flanges to realize the driving of the material tray; a semicircular support arc is added on the connecting flange to pre-support the material tray before connecting the fixed material tray flange and the connecting flange, thereby providing convenience for connecting the fixed connecting flange and the material tray flange.

[0011] The present invention is further configured as follows: the upward guide frame is provided with a pressure roller adjustment groove, and the two ends of the material pulling pressure roller are respectively provided with adjustment sliders that slide with the pressure roller adjustment groove; the pressure roller adjustment groove is rotatably connected with an adjustment screw, and the adjustment screw is threadedly matched with the adjustment slider.

[0012] By adopting the above technical solution, when it is necessary to adjust the distance between the material pulling pressure roller and the material pulling rotating roller, the adjusting screw can be rotated in different directions, and the threaded propulsion force generated between the adjusting screw and the adjusting slider can be utilized to drive the material pulling pressure roller closer to or away from the material pulling rotating roller, thereby facilitating the adjustment of the distance between the material pulling pressure roller and the material pulling rotating roller, thereby improving the adaptability to plastic bag films of different thicknesses.

[0013] The present invention is further configured as follows: the cutting and rolling mechanism also includes a mounting shaft for mounting a cutter, the cutter is fixedly mounted at the midpoint of the mounting shaft, and the mounting shaft is coaxially rotatably connected with cutting rollers on both sides of the cutter.

[0014] By adopting the above technical solution, an additional mounting shaft is provided to provide an installation position for the cutter, and a cutting pressure roller is arranged on the mounting shaft, so that the cutting pressure roller applies pressure to the uncut portion of the plastic bag film, forcing the portion to be close to the guide roller, thereby reducing the pulling force on the plastic bag film when cutting waste.

[0015] The present invention is further configured such that the cutting end of the cutter is embedded with a blade and reinforced with bolts.

[0016] By adopting the above technical solution, the detachable installation of the blade and the cutter is achieved while ensuring the installation stability of the blade. Therefore, after the blade is worn, only the blade needs to be replaced, effectively reducing the production cost waste caused by cutter wear.

[0017] The present invention is further configured as follows: the cutting mechanism also includes two distance adjustment grooves respectively fixed on both sides of the main frame, and a distance adjustment shaft sliding between the two distance adjustment grooves, two ends of the distance adjustment shaft are respectively threadedly fitted with two clamping nuts, the two clamping nuts cooperate to clamp the distance adjustment grooves, and the distance adjustment shaft is provided with a motor mounting shell for installing the cutting motor.

[0018] By adopting the above technical scheme, when it is necessary to adjust the cutting depth of the plastic bag film, the two clamping nuts at both ends of the distance adjustment shaft are loosened, and the distance adjustment shaft is slid along the distance adjustment groove to adjust the distance between the toothed blade disc and the cutting support roller, and the cutting depth can be adjusted. Finally, the clamping nut is tightened, and the friction between the clamping nut and the distance adjustment groove is used to fix the distance adjustment shaft. In summary, the distance adjustment shaft and the motor mounting shell are added to install the cutting motor, and the distance adjustment groove and the distance adjustment shaft are used to cooperate to adjust the distance between the toothed blade disc and the cutting support roller, thereby achieving adjustable cutting depth for the plastic bag film.

[0019] The present invention is further configured as follows: the distance adjustment shaft sliding sleeve is connected to two position adjustment parts, the two position adjustment parts are threadedly matched with locking bolts, the two motor mounting shells are rotatably connected to the position adjustment parts, and a torsion spring is arranged between the position adjustment parts and the motor mounting shells.

[0020] By adopting the above technical solution, when it is necessary to adjust the position of the two tear marks, the locking bolt is loosened and the position adjustment piece is slid along the distance adjustment shaft to adjust the position of the two toothed blade discs. Finally, the locking bolt is tightened to utilize the friction between the locking bolt and the distance adjustment shaft to effectively prevent the position adjustment piece from sliding abnormally. The motor mounting shell is rotatably connected to the position adjustment piece and a torsion spring is added, so that the elastic potential energy of the torsion spring is utilized to apply a thrust to the motor mounting shell, thereby forcing the circumferential surface of the toothed blade disc to always be tangential to and pressed against the plastic bag film.

[0021] The present invention is further configured as follows: an opening plate is provided between the cutting mechanism and the traction mechanism on the main frame, and the two sides of the opening plate are inserted into the openings of the bag bodies on both sides; a pressing mechanism is also provided behind the opening plate, and the pressing mechanism includes a pressing arch frame, a pressing cylinder fixed to the pressing arch frame, and a pressing plate fixed to the piston rod end of the pressing cylinder.

[0022] By adopting the above technical solution, when the plastic bag film passes through the opening plate, the opening plate applies a thrust to the sealing strip to force it to separate, so that after the bag making is completed, the openings of the two bag bodies of the packaging bag are in an open state, thereby providing convenience for users to use the packaging bag; after the sealing strip is split, the plastic bag film passes through the edge pressing mechanism. During this process, the edge pressing cylinder drives the edge pressing plate to rise and fall cyclically, and applies pressure to the plastic bag film at a certain time interval, forcing the sealing strip of the plastic bag film to reconnect at a specific spacing, which is equal to the width of each packaging bag, thereby effectively avoiding the problem of the two parts of the sealing strip not being aligned after the subsequent hot pressing cut due to the disassembly of the sealing strip.

[0023] The present invention is further configured as follows: the traction mechanism includes a traction roller rotatably connected to the main frame, a traction pressure roller gap-matched with the traction roller, and a traction motor for driving the traction roller, and the corresponding sealing strips of the traction roller and the traction pressure roller are provided with avoidance ring grooves.

[0024] By adopting the above technical solution, the traction mechanism presses the plastic bag film through the traction pressure roller, forcing it to tightly fit the traction roller, and drives the traction roller to rotate through the traction motor, thereby utilizing the friction between the traction roller and the plastic bag film to achieve traction of the plastic bag film; it should be noted that an avoidance ring groove is added on the traction roller and the traction pressure roller to avoid reconnection of the two separated sealing strips.

[0025] The present invention is further configured as follows: the unloading mechanism includes an unloading frame, two conveyor belt rollers rotatably connected to the unloading frame, a conveyor belt wound around the two conveyor belt rollers, and an unloading motor for driving one of the conveyor belt rollers.

[0026] By adopting the above technical solution, the unloading mechanism utilizes the unloading motor to drive the conveyor belt rollers to rotate. During the rotation of the conveyor belt rollers, the conveyor belt is driven to circulate around the two conveyor belt rollers, thereby utilizing the friction force on the upper surface of the conveyor belt, which can not only realize the unloading of the packaging bag after bag making is completed, but also pull the plastic bag film to force it to fully unfold in the length direction.

[0027] The present invention is further configured as follows: heat sealing sleeves are respectively arranged on both sides of the unloading frame, the heat sealing mechanism includes two heat sealing sliding columns that slide with the heat sealing sliding sleeves, a heat sealing beam whose two ends are respectively fixed to the heat sealing sliding columns, a heat pressing seat that is longitudinally slidably connected to the heat sealing beam, and a PTC heating strip arranged on the heat pressing seat, the heat pressing seat sliding column is connected to a limiting pressure plate, and the limiting pressure plate is provided with a long groove for the PTC heating strip to pass through.

[0028] By adopting the above technical solution, when the plastic bag film is pulled to the heat sealing mechanism, the heat sealing beam slides downward along the track defined by the heat sealing sliding column and the heat sealing sliding sleeve. During the sliding process, the limiting pressure plate first presses on the plastic bag film, and the heat sealing beam continues to move downward. At this time, the heat pressing seat gradually approaches the limiting pressure plate until the heat pressing seat fits on the upper surface of the limiting pressure plate. At this time, the PTC heating strip passes through the long groove of the limiting pressure plate and is pressed tightly on the plastic bag film, so that the heat generated by the PTC heating strip forces the plastic bag film to partially melt, and the process is completed after cooling and re-solidification. The side of the plastic bag film is heat-sealed; after the heat sealing is completed, the heat-sealing beam moves up and resets. At this time, the heat pressing seat and the PTC heating strip first move up until the PTC heating strip is separated from the limiting pressure plate, and then the limiting pressure plate starts to move up until it is reset to a predetermined height; in summary, the heat-sealing mechanism heats the plastic bag film by the PTC heating strip to achieve its side heat sealing, and an additional limiting pressure plate is provided to press the plastic bag film, which ensures that the two sides of the plastic bag film are fully fitted to improve the heat sealing effect on the one hand, and prevents the PTC heating strip from pulling the plastic bag film to bulge upward when moving up on the other hand.

[0029] The present invention is further configured as follows: cutting sleeves are respectively arranged on both sides of the unloading machine frame, and the cutting mechanism includes two cutting sliding columns slidingly matched with the cutting sliding sleeves, a cutting beam whose two ends are respectively fixed to the cutting sliding columns, a hot cutting seat longitudinally adjustably installed on the cutting beam, and a tungsten steel hot cutting knife arranged on the hot cutting seat.

[0030] By adopting the above technical solution, the cutting mechanism conducts heat to the tungsten steel hot cutter through the hot cutting seat. When it is necessary to cut the plastic bag film to form an independent packaging bag, the cutting beam moves downward along the sliding track defined by the cutting sliding column and the cutting sliding sleeve until the tungsten steel hot cutter cuts the plastic bag film, so that the independent packaging bag is accelerated forward and separated from the plastic bag film under the conveyance of the unloading mechanism, thereby completing bag making and unloading. In summary, the cutting mechanism uses the heated tungsten steel hot cutter to cut the plastic bag film, which improves the cutting effect on the one hand, and realizes the secondary heat sealing of the plastic bag film on the other hand, effectively ensuring the heat sealing effect on both sides of the packaging bag.

[0031] The present invention is further configured as follows: the crankshaft transmission mechanism includes a connecting frame that simultaneously fixes two heat-sealing sliding columns and two cutting sliding columns, a shaft rod hinged to the connecting frame, and a crankshaft driven by an AC motor, and the bottom end of the shaft rod is rotatably sleeved with the crankshaft.

[0032] By adopting the above technical scheme, when the hot pressing cutting device is working normally, the crankshaft is driven by the AC motor to rotate continuously, and the crankshaft cyclically pulls and pushes the shaft rod during rotation, thereby cyclically pulling and pushing the connecting frame after the transmission of the shaft rod, and then synchronously driving the heat sealing mechanism and the cutting mechanism to perform lifting movements through the connecting frame; in summary, the connecting frame is used to connect the two heat sealing sliding columns and the two cutting sliding columns, so as to achieve the technical effect of synchronously driving the cutting mechanism and the heat sealing mechanism through the crankshaft transmission mechanism, and effectively improve the coordination between the two.

[0033] In summary, the present invention has the following beneficial effects: it is equipped with waste strips, punching holes, cut marks and heat-sealed cutting, so that a single device can produce the technical effect of the packaging bags disclosed in the background technology, effectively improving production efficiency; a semicircular support arc is added on the connecting flange, so that before connecting the fixed material tray flange and the connecting flange, the material tray is pre-supported, thereby facilitating the connection of the fixed connecting flange and the material tray flange; by rotating the adjusting screw in different directions, the threaded propulsion force generated between the adjusting screw and the adjusting slider can be used to drive the material pulling roller to approach or move away from the material pulling roller, thereby facilitating the adjustment of the spacing between the material pulling roller and the material pulling roller; the non-uniformity of the plastic bag film by the cutting roller Pressure is applied to the cutting part, forcing the part to be close to the guide roller, thereby reducing the pulling force on the plastic bag film when cutting waste; after the blade is worn, only the blade needs to be replaced, effectively reducing the production cost waste caused by the wear of the cutter; a distance adjustment shaft and a motor mounting shell are added to install the cutting motor, and the distance adjustment groove and the distance adjustment shaft are used to adjust the distance between the toothed blade disc and the cutting support roller, thereby achieving adjustable cutting depth for the plastic bag film; the motor mounting shell is rotatably connected to the position adjustment member and a torsion spring is added, so that the elastic potential energy of the torsion spring is used to apply thrust to the motor mounting shell, thereby forcing the circumferential surface of the toothed blade disc to always be tangential to the plastic bag film; The opening plate applies a thrust to the sealing strip to force it to separate, so that after the bag making is completed, the openings of the two bag bodies of the packaging bag are in an open state, thereby providing convenience for users to use the packaging bag; pressure is applied to the plastic bag film at a certain time interval to force the sealing strip of the plastic bag film to reconnect at a specific interval, thereby effectively avoiding the problem of the two parts of the sealing strip not being aligned after the subsequent hot pressing cut due to the disassembly of the sealing strip; an avoidance ring groove is added on the traction roller and the traction pressure roller to avoid the reconnection of the two separated parts of the sealing strip; the friction force on the upper surface of the conveyor belt roller can not only realize the unloading of the packaging bag after the bag making is completed, but also pull the plastic bag film to force its length direction; the heat-sealing mechanism heats the plastic bag film by the PTC heating strip to achieve heat sealing on its side, and an additional limiting pressure plate is provided to press the plastic bag film, which ensures that the two sides of the plastic bag film are fully fitted to improve the heat-sealing effect on the one hand, and prevents the PTC heating strip from pulling the plastic bag film to bulge upward when moving upward on the other hand; the cutting mechanism uses a heated tungsten steel hot cutter to cut the plastic bag film, which improves the cutting effect on the one hand, and achieves secondary heat sealing of the plastic bag film on the other hand, effectively ensuring the heat-sealing effect on both sides of the packaging bag; a connecting frame is used to connect the two heat-sealing sliding columns and the two cutting sliding columns, thereby achieving the technical effect of synchronously driving the cutting mechanism and the heat-sealing mechanism via the crankshaft transmission mechanism, and effectively improving the coordination between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the overall structure diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of the feeding device and the stripping device of the present invention;

[0036] Figure 3 for Figure 2 A schematic diagram of the structure from another perspective;

[0037] Figure 4 It is a schematic diagram of the structure of the cutter of the present invention;

[0038] Figure 5 It is a schematic diagram of the structures of the punching mechanism, the cutting mechanism and the pulling mechanism of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the punching mechanism of the present invention;

[0040] Figure 7 It is a structural schematic diagram of the cutting mechanism of the present invention;

[0041] Figure 8 It is a structural schematic diagram of the opening plate and the edge pressing mechanism of the present invention;

[0042] Fig. 9 This is a diagram showing the relationship between the opening plate and the plastic bag film of the present invention, and for the convenience of showing, both sides of the plastic bag film are cut off;

[0043] Fig.10 It is a structural schematic diagram of the traction mechanism of the present invention;

[0044] Fig.11 It is a structural schematic diagram of the hot pressing cutting device and the material feeding mechanism of the present invention;

[0045] Fig.12 It is a structural schematic diagram of the hot pressing cutting device of the present invention;

[0046] Fig.13 It is a schematic diagram of the structure of the packaging bag;

[0047] Fig.14 This is a cross-sectional view of a packaging bag, which is cut off for the sake of convenience;

[0048] Fig.15 It is a schematic diagram of the structure of a plastic bag film;

[0049] Fig.16 for Fig.15 The enlarged schematic diagram of part A mainly shows the sealing strip on the plastic bag film.

[0050] Description of the drawings: 11, loading rack; 12, connecting flange; 13, material tray; 14, loading motor; 15, material tray flange; 16, semicircular support arc; 21, upward guide frame; 22, guide roller; 23, material pulling roller; 24, material pulling pressure roller; 241, pressure roller adjustment slot; 242, adjustment slider; 243, adjustment screw; 25, material pulling motor; 26, cutting arm; 27, cutting knife; 271, installation shaft; 272, cutting material Pressing roller; 273, blade; 28, coiling disc; 29, coiling motor; 3, main frame; 31, notching support roller; 32, toothed blade disc; 33, notching motor; 34, distance adjustment slot; 35, distance adjustment shaft; 36, clamping nut; 37, motor mounting shell; 38, position adjustment member; 381, torsion spring; 39, locking bolt; 41, opening plate; 42, edge pressing arch frame; 43, edge pressing cylinder; 44, edge pressing plate; 45 , traction roller; 46, traction roller; 47, traction motor; 48, avoidance ring groove; 491, punching arch; 492, punching cylinder; 493, punching module; 494, punching base; 495, punching cylinder; 496, waste channel; 51, heat sealing sleeve; 52, heat sealing sliding column; 53, heat sealing beam; 54, hot pressing seat; 55, PTC heating strip; 56, limiting pressure plate; 57, long groove; 58, cutting sleeve ; 591, cutting sliding column; 592, cutting beam; 593, hot cutting seat; 594, tungsten steel hot cutting knife; 595, connecting frame; 596, shaft; 597, crankshaft; 598, AC motor; 61, unloading frame; 62, conveyor belt roller; 63, conveyor belt; 64, unloading motor; 91, middle strip; 92, bag body; 93, opening; 94, tear mark; 95, sealing strip; 96, through hole; 97, plastic bag film. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0052] A heat pressing bag equipment for packaging bags, such as Figure 1As shown, it includes a feeding device, a stripping device, a punching mechanism, a cutting mechanism, a traction mechanism, a hot pressing cutting device and a feeding mechanism; the stripping device includes an upward guide frame 21, a plurality of guide rollers 22 rotatably connected to the upward guide frame 21, a pulling mechanism arranged on the upward guide frame 21, and a cutting mechanism arranged on the upward guide frame 21, the pulling mechanism includes a pulling roller 23 rotatably connected to the upward guide frame 21, a pulling pressure roller 24 gap-matched with the pulling roller 23, and a pulling motor 25 for driving the pulling roller 23, the cutting mechanism includes a cutting arm 26, a cutting knife 27 gap-matched with one of the guide rollers 22, a coiling disc 28 detachably rotatably connected to the cutting arm 26, and a coiling motor 29 for driving the coiling disc 28; the hot pressing bag equipment also includes a main frame 3, the cutting mechanism includes a cutting support roller 31 rotatably connected to the main frame 3, two toothed blade discs 32 tangent to the cutting support roller 31 (marked on Figure 7 ), and two cutting motors 33 for driving the toothed blade disc 32 respectively; the hot pressing and cutting device includes a longitudinally moving heat sealing mechanism and a cutting mechanism, a crankshaft transmission mechanism arranged between the heat sealing mechanism and the cutting mechanism, and an AC motor 598 for driving the crankshaft transmission mechanism.

[0053] The present invention releases the plastic bag film 97 at a uniform speed from the feeding device during normal operation, and the released plastic bag film 97 enters the stripping device, and the pulling motor 25 drives the pulling roller 23 and cooperates with the pulling pressure roller 24 to pull the plastic bag film 97, forcing it to move forward along the guide track formed by multiple guide rollers 22. When it moves to the cutting and rolling mechanism, the winding motor 29 drives the winding disc 28 to rotate, thereby generating a pulling force on the waste material to be cut off, and cooperates with the advancement of the main body of the plastic bag film 97, so that the plastic bag film 97 is cut by the cutter 27, and the technical effect of cutting the waste material from the main body of the plastic bag film 97 is achieved; after the waste material is cut off, the plastic bag film 97 is pulled forward by the traction force of the traction mechanism and passes through the punching mechanism and the cutting mechanism in sequence. In the process of the plastic bag film 97 passing through the punching mechanism, the punching mechanism completes the punching forming of the through hole 96 on the middle strip 91, and in the process of the plastic bag film 97 passing through the cutting mechanism, the cutting motor 33 drives the toothed blade knife The disc 32 rotates, and the toothed blade disc 32 cooperates with the cutting support roller 31 during the rotation process to cut two tooth-shaped long cutting marks on the plastic bag film 97, that is, the tear mark 94 after the bag making is completed; after the setting of the cut marks is completed, the plastic bag film 97 is sent to the hot pressing cutting device by the traction mechanism, and the plastic bag film 97 entering the hot pressing cutting device begins to be transported by the unloading mechanism. During the transportation process, the AC motor 598 is driven by the crankshaft transmission mechanism to drive the heat sealing mechanism and the cutting mechanism to perform reciprocating longitudinal motion, so that the heat sealing mechanism completes the side sealing of the packaging bag, and the cutting mechanism completes the cutting after the side sealing is completed, so that the packaging bag is separated from the plastic bag film 97, and finally the unloading mechanism transports the packaging bag to the unloading end, and the worker can take the packaging bag off; in summary, the present invention simultaneously has waste stripping, punching, cutting and heat sealing and cutting, so that a single device can produce the technical effect of the packaging bag disclosed in the background technology, and effectively improve the production efficiency.

[0054] The specific structure of the feeding device is as follows: Figure 2 , Figure 3As shown, the feeding device includes a feeding frame 11, two connecting flanges 12 connected to the feeding frame 11 for relative rotation, a material tray 13 whose two ends are detachably and coaxially fixed to the connecting flanges 12, and a feeding motor 14 for driving one of the connecting flanges 12 to rotate. The centers of the two ends of the material tray 13 are respectively provided with material tray flanges 15, so that the material tray 13 is detachably and rotatably installed on the feeding frame 11 through the cooperation of the two material tray flanges 15 and the connecting flange 12, and the feeding motor 14 is used to drive one of the material tray flanges 15 to realize the driving of the material tray 13; in actual use, it is found that before the connecting flange 12 is connected and fixed with the material tray flange 15, it is necessary to continuously support the material tray 13, which is inconvenient. For this reason, the connecting flange 12 is processed and formed with a semicircular support arc 16 for supporting the material tray flange 15, so that before the fixing material tray flange 15 and the connecting flange 12 are connected, the semicircular support arc 16 pre-supports the material tray 13, thereby providing convenience for connecting the fixing connecting flange 12 and the material tray flange 15.

[0055] In order to improve the adaptability of the pulling mechanism to plastic bag films 97 of different thicknesses, Figure 2 As shown, the upward guide frame 21 is provided with a pressure roller adjustment groove 241, and adjustment sliders 242 that slide and cooperate with the pressure roller adjustment groove 241 are fixedly installed at both ends of the material pulling pressure roller 24, and the pressure roller adjustment groove 241 is rotatably connected to an adjustment screw 243, and the adjustment screw 243 is threadedly cooperated with the adjustment slider 242; when it is necessary to adjust the distance between the material pulling pressure roller 24 and the material pulling rotating roller 23, the adjustment screw 243 is rotated in different directions, and the threaded propulsion force generated between the adjustment screw 243 and the adjustment slider 242 can be utilized to push the material pulling pressure roller 24 closer to or away from the material pulling rotating roller 23, thereby providing convenience for adjusting the distance between the material pulling pressure roller 24 and the material pulling rotating roller 23, thereby improving the adaptability of the material pulling mechanism to plastic bag films 97 of different thicknesses.

[0056] In actual use, it is found that when the cutter 27 cuts the plastic bag film, it may pull the plastic bag film 97 to close in the width direction, thereby causing the problem of changing the cutting position. Figure 3 , Figure 4 As shown, the cutting and rolling mechanism also includes a mounting shaft 271 for mounting the cutter 27. The cutter 27 is fixedly mounted at the midpoint of the mounting shaft 271. The mounting shaft 271 is coaxially rotatably connected to cutting pressure rollers 272 on both sides of the cutter 27. The mounting shaft 271 is additionally provided to provide a mounting position for the cutter 27, and a cutting pressure roller 272 is arranged on the mounting shaft 271, so that the cutting pressure roller 272 applies pressure to the uncut portion of the plastic bag film 97, forcing the portion to be close to the guide roller 22, thereby reducing the pulling force on the plastic bag film 97 when cutting waste.

[0057] In order to ensure the cutting effect, the sharpness of the cutter 27 is required to be high, which causes the blade of the cutter 27 to be easily worn. Replacing the entire cutter 27 after wear is a problem of wasting production costs. Figure 4 As shown, the cutting end of the cutter 27 is embedded with a blade 273 and reinforced with bolts, so that the blade 273 and the cutter 27 can be detachably installed while ensuring the installation stability of the blade 273. After the blade 273 is worn, only the blade 273 needs to be replaced, effectively reducing the production cost waste caused by the wear of the cutter 27.

[0058] The specific structure of the punching mechanism is as follows: Figure 5 , Figure 6 As shown, the punching mechanism includes a punching arch frame 491, a punching cylinder 492 fixedly mounted on the punching arch frame 491, a punching module 493 arranged at the piston rod end of the punching cylinder 492, and a punching base 494 located directly below the punching module 493. The lower surface of the punching module 493 is provided with punching cylinders 495 corresponding to three through holes 96 respectively. The punching base 494 is penetrated by a waste channel 496 for inserting the punching cylinder 495. The plastic bag film 97 In the process of passing through the punching mechanism, the punching cylinder 492 pulls and pushes the punching module 493 to perform a cyclic lifting movement. When descending, the punching module 493 uses the shear cooperation between the punching cylinder 495 and the opening channel wall of the waste channel 496 to punch holes in the plastic bag film to form through holes 96. The waste that is impacted and separated is temporarily accumulated in the waste channel 496. When a certain amount is accumulated, the waste below is pushed by the waste above and discharged through the lower opening of the waste channel 496.

[0059] The function of the cutting mechanism is to cut a cut on the plastic bag film 97, and the cut serves as the tear mark 94 of the packaging bag. Therefore, the depth of the cut cut by the cutting mechanism has a relatively strict requirement. Figure 5 , Figure 7As shown, the cutting mechanism also includes two distance adjustment slots 34 respectively fixed on both sides of the main frame 3, and a distance adjustment shaft 35 sliding between the two distance adjustment slots 34, two ends of the distance adjustment shaft 35 are respectively threadedly matched with two clamping nuts 36, the two clamping nuts 36 are matched with the distance adjustment slots 34, and the distance adjustment shaft 35 is provided with a motor mounting shell 37 for mounting the cutting motor 33; when it is necessary to adjust the cutting depth of the plastic bag film 97, the two clamping nuts 36 at both ends of the distance adjustment shaft 35 are loosened, and the distance adjustment shaft 35 is slid along the distance adjustment slot 34. The section shaft 35 is used to adjust the distance between the toothed blade disc 32 and the cutting support roller 31, so as to adjust the cutting depth. Finally, the clamping nut 36 is tightened, and the friction between the clamping nut 36 and the distance adjustment shaft 35 is used to fix the distance adjustment shaft 35. In summary, the distance adjustment shaft 35 and the motor mounting shell 37 are added to install the cutting motor 33, and the distance adjustment groove 34 and the distance adjustment shaft 35 are used to cooperate to achieve the distance adjustment between the toothed blade disc 32 and the cutting support roller 31, thereby achieving adjustable cutting depth for the plastic bag film 97.

[0060] The motor mounting housing 37 is mounted on the distance adjustment shaft 35 in the following manner: Figure 7 As shown, the distance adjustment shaft 35 is slidably sleeved with two position adjustment members 38, and the two position adjustment members 38 are both threadedly matched with locking bolts 39, and the two motor mounting shells 37 are both rotatably connected to the position adjustment members 38, and a torsion spring 381 is arranged between the position adjustment members 38 and the motor mounting shells 37; when it is necessary to adjust the position of the two tear marks 94, the locking bolt 39 is loosened and the position adjustment member 38 is slid along the distance adjustment shaft 35 to adjust the position of the two toothed blade discs 32, and finally the locking bolt 39 is tightened to utilize the friction between the locking bolt 39 and the distance adjustment shaft 35 to effectively prevent the position adjustment member 38 from sliding abnormally. It should also be noted that since a torsion spring 381 is arranged between the position adjustment member 38 and the motor mounting shell 37, the elastic potential energy of the torsion spring 381 can be used to apply a thrust to the motor mounting shell 37, thereby forcing the circumferential surface of the toothed blade disc 32 to always be tangential to and pressed against the plastic bag film 97.

[0061] In order to facilitate bagging for customers, the supermarket requires that the openings 93 of the bag body 92 on both sides of the packaging bag are in an open state, that is, the two sealing strips 95 are in a separated state. In order to meet this requirement of the supermarket, the applicant hired labor to manually pull the bag body 92 one by one after completing the bag making to force the sealing strips 95 to separate. However, it was found in actual production that this method not only wasted labor, but also had the problem of damaging the packaging bag. Figure 5 , Figure 8 , Fig. 9As shown, the main frame 3 is fixedly installed with an opening plate 41 between the cutting mechanism and the traction mechanism, and the two sides of the opening plate 41 are inserted into the two sealing strips 95 of the plastic bag film 97; so that when the plastic bag film 97 passes through the opening plate 41, the opening plate 41 applies a thrust to the sealing strip to force it to separate, so that after the bag making is completed, the openings 93 of the two bag bodies 92 of the packaging bag are both in an open state, and there is no need to hire labor to manually disassemble the sealing strip 95, effectively reducing the production cost.

[0062] After the opening plate 41 is added, it is found that the two parts of the sealing strip 95 are separated, which may cause the opening 93 of the packaging bag to be misaligned, thereby causing the two parts of the sealing strip 95 to be misaligned. Figure 5 , Figure 8 As shown, a pressing mechanism is further provided behind the opening plate 41, and the pressing mechanism includes a pressing arch frame 42, a pressing cylinder 43 fixed to the pressing arch frame 42, and a pressing plate 44 fixed to the piston rod end of the pressing cylinder 43; when the sealing strip 95 is disassembled, the plastic bag film 97 passes through the pressing mechanism. During this process, the pressing cylinder 43 drives the pressing plate 44 to rise and fall cyclically, and applies pressure to the plastic bag film 97 at a certain time interval, forcing the sealing strip 95 of the plastic bag film 97 to be reconnected at a specific interval, which is equal to the width of each packaging bag, thereby effectively avoiding the problem of the two parts of the sealing strip 95 not being aligned after the subsequent hot pressing and cutting due to the sealing strip 95 being completely disassembled.

[0063] The specific structure of the traction mechanism is as follows: Figure 5 , Fig.10 As shown, the traction mechanism includes a traction roller 45 rotatably connected to the main frame 3, a traction pressure roller 46 with a gap fitted with the traction roller 45, and a traction motor 47 for driving the traction roller 45, so that the traction mechanism presses the plastic bag film 97 through the traction pressure roller 46 to force it to tightly fit the traction roller 45, and drives the traction roller 45 to rotate through the traction motor 47, so as to utilize the friction between the traction roller 45 and the plastic bag film 97 to achieve traction of the plastic bag film 97; in order to avoid the sealing strip 95 on the plastic bag film 97 being completely reconnected due to the distance between the traction pressure roller 46 and the traction roller 45, the traction roller 45 and the traction pressure roller 46 are both provided with an avoidance annular groove 48 corresponding to the sealing strip 95, so as to avoid the two parts of the separated sealing strip 95 from being reconnected.

[0064] The specific structure of the material cutting mechanism is as follows: Fig.11As shown, the unloading mechanism includes an unloading frame 61, two conveyor belt rollers 62 rotatably connected to the unloading frame 61, a conveyor belt 63 wound around the two conveyor belt rollers 62, and an unloading motor 64 for driving one of the conveyor belt rollers 62; the unloading mechanism utilizes the unloading motor 64 to drive the conveyor belt rollers 62 to rotate, and during the rotation of the conveyor belt rollers 62, the conveyor belt 63 is driven to circulate around the two conveyor belt rollers 62, thereby utilizing the friction force on the upper surface of the conveyor belt 63, which can not only realize the unloading of the packaging bag after the bag making is completed, but also can pull the plastic bag film 97 to force it to fully unfold in the length direction.

[0065] The specific structure of the heat sealing mechanism is as follows: Fig.11 , Fig.12 As shown, heat-sealing sleeves 51 are welded and fixed on both sides of the unloading frame 61, and the heat-sealing mechanism includes two heat-sealing sliding columns 52 that slide with the heat-sealing sliding columns 51, heat-sealing crossbeams 53 that are respectively fixed to the heat-sealing sliding columns 52 at both ends, a heat-pressing seat 54 that is longitudinally adjustably connected to the heat-sealing crossbeams 53, and a PTC heating strip 55 fixedly installed on the heat-pressing seat 54, and the sliding column of the heat-pressing seat 54 is connected to a limiting plate 56, and the limiting plate 56 is provided with a long groove 57 for the PTC heating strip 55 to pass through; when the plastic bag film 97 is pulled to the heat-sealing mechanism, the heat-sealing crossbeam 53 slides downward along the trajectory defined by the heat-sealing sliding column 52 and the heat-sealing sliding sleeve 51, and during the sliding process, the limiting plate 56 first presses on the plastic bag film 97, and the heat-sealing crossbeam 53 continues to move downward, at this time, the heat-pressing seat 54 gradually approaches the limiting plate 56 until the heat-pressing seat 54 is attached to the upper surface of the limiting plate 56, at this time, The PTC heating strip 55 passes through the long groove 57 of the limiting pressure plate 56 and is pressed against the plastic bag film 97, so that the heat generated by the PTC heating strip 55 forces the plastic bag film 97 to partially melt, and the side heat sealing of the plastic bag film 97 can be completed after cooling and re-solidification; after the heat sealing is completed, the heat sealing beam 53 moves up and resets, at this time, the hot pressing seat 54 and the PTC heating strip 55 first move up until the PTC heating strip 55 is separated from the limiting pressure plate 56, and then the limiting pressure plate 56 starts to move up until it is reset to a predetermined height; in summary, the heat sealing mechanism heats the plastic bag film 97 by the PTC heating strip 55 to achieve its side heat sealing, and an additional limiting pressure plate 56 is provided to press the plastic bag film 97, which ensures that the two sides of the plastic bag film 97 are fully fitted to improve the heat sealing effect on the one hand, and prevents the PTC heating strip 55 from pulling the plastic bag film 97 upward due to viscosity when moving up.

[0066] The specific structure of the cutting mechanism is as follows: Fig.11 , Fig.12As shown, a cutting sleeve 58 is provided on both sides of the unloading frame 61, and the cutting mechanism includes two cutting sliding columns 591 that slide with the cutting sliding columns 58, a cutting beam 592 that is fixed to the cutting sliding columns 591 at both ends, a heat cutting seat 593 that is longitudinally adjustable and mounted on the cutting beam 592, and a tungsten steel heat cutting knife 594 that is fixedly mounted on the heat cutting seat 593; the cutting mechanism conducts heat to the tungsten steel heat cutting knife 594 through the heat cutting seat 593, and when it is necessary to cut the plastic bag film 97 independent packaging bag, the cutting beam 592 is fixed to the heat cutting seat 593. The beam 592 moves downward along the sliding track defined by the cutting sliding column 591 and the cutting sliding sleeve 58 until the tungsten steel hot cutting knife 594 cuts the plastic bag film 97, so that the independent packaging bags are accelerated forward and separated from the plastic bag film 97 under the transportation of the unloading mechanism, thereby completing the bag making and unloading; in summary, the cutting mechanism uses the heated tungsten steel hot cutting knife 594 to cut the plastic bag film 97, which on the one hand improves the cutting effect, and on the other hand realizes the secondary heat sealing of the plastic bag film 97, effectively ensuring the heat sealing effect on both sides of the packaging bag.

[0067] The specific structure of the crankshaft transmission mechanism is as follows: Fig.11 , Fig.12 As shown, the crankshaft transmission mechanism includes a connecting frame 595 for fixing two heat-sealing sliding columns 52 and two cutting sliding columns 591 at the same time, a shaft 596 hinged to the connecting frame 595, and a crankshaft 597 driven by an AC motor 598, and the bottom end of the shaft 596 is rotatably sleeved with the crankshaft 597; when the hot pressing and cutting device is working normally, the crankshaft 597 is driven by the AC motor 598 to rotate continuously, and the crankshaft 597 cyclically pulls and pushes the shaft 596 during the rotation process, so that after being driven by the shaft 596, the connecting frame 595 is cyclically pulled and pushed, and then the heat-sealing mechanism and the cutting mechanism are synchronously driven to perform lifting movements through the connecting frame 595, thereby achieving the technical effect that under the transmission of the crankshaft transmission mechanism, the heat-sealing mechanism and the cutting mechanism can be driven simultaneously by one AC motor 598, and the coordination between the two is effectively improved.

[0068] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A hot pressing bag equipment for packaging bags, characterized in that: It includes a feeding device, a stripping device, a punching mechanism, a notching mechanism, a traction mechanism, a hot pressing cutting device and a feeding mechanism; The stripping device comprises an upward guide frame (21), a plurality of guide rollers (22) rotatably connected to the upward guide frame (21), a material pulling mechanism arranged on the upward guide frame (21), and a cutting and rolling mechanism arranged on the upward guide frame (21); the material pulling mechanism comprises a material pulling roller (23) rotatably connected to the upward guide frame (21), a material pulling pressure roller (24) gap-matched with the material pulling roller (23), and a material pulling motor (25) for driving the material pulling roller (23); the cutting and rolling mechanism comprises a cutting arm (26), a cutting knife (27) gap-matched with one of the guide rollers (22), a winding disc (28) detachably rotatably connected to the cutting arm (26), and a winding motor (29) for driving the winding disc (28); The hot pressing bag device also includes a main frame (3), and the cutting mechanism includes a cutting support roller (31) rotatably connected to the main frame (3), two toothed blade discs (32) tangential to the cutting support roller (31), and two cutting motors (33) respectively used to drive the toothed blade discs (32); The hot pressing and cutting device comprises a heat sealing mechanism and a cutting mechanism that move longitudinally, a crankshaft transmission mechanism disposed between the heat sealing mechanism and the cutting mechanism, and an AC motor (598) for driving the crankshaft transmission mechanism; The upward guide frame (21) is provided with a pressure roller adjustment groove (241), and both ends of the material pulling pressure roller (24) are respectively provided with adjustment sliders (242) that are slidably matched with the pressure roller adjustment groove (241), and the pressure roller adjustment groove (241) is rotatably connected to an adjustment screw (243), and the adjustment screw (243) is threadedly matched with the adjustment slider (242); The notching mechanism further comprises two distance adjustment slots (34) respectively fixed to two sides of the main frame (3), and a distance adjustment shaft (35) sliding between the two distance adjustment slots (34); two ends of the distance adjustment shaft (35) are respectively threadedly engaged with two clamping nuts (36); the two clamping nuts (36) are engaged with the distance adjustment slots (34) to clamp; the distance adjustment shaft (35) is provided with a motor mounting shell (37) for mounting a notching motor (33); The distance adjustment shaft (35) is slidably sleeved with two position adjustment members (38), the two position adjustment members (38) are threadedly matched with locking bolts (39), the two motor mounting shells (37) are rotatably connected to the position adjustment members (38), and a torsion spring (381) is provided between the position adjustment members (38) and the motor mounting shells (37); The main frame (3) is provided with an opening plate (41) between the notching mechanism and the traction mechanism, and the two sides of the opening plate (41) are inserted into the openings (93) of the bag bodies (92) on both sides; a pressing mechanism is also provided behind the opening plate (41), and the pressing mechanism comprises a pressing arch frame (42), a pressing cylinder (43) fixed to the pressing arch frame (42), and a pressing plate (44) fixed to the piston rod end of the pressing cylinder (43); The traction mechanism comprises a traction roller (45) rotatably connected to the main frame (3), a traction pressure roller (46) clearance-matched with the traction roller (45), and a traction motor (47) for driving the traction roller (45). The traction roller (45) and the traction pressure roller (46) are both provided with avoidance ring grooves (48) corresponding to the sealing strips (95).

2. The hot pressing bag equipment for packaging bags according to claim 1, characterized in that: The feeding device comprises a feeding frame (11), two connecting flanges (12) connected to the feeding frame (11) for relative rotation, a material tray (13) detachably and coaxially fixed to the connecting flanges (12), and a feeding motor (14) for driving one of the connecting flanges (12) to rotate, wherein the centers of both ends of the material tray (13) are respectively provided with material tray flanges (15), and the connecting flange (12) is provided with a semicircular support arc (16) for supporting the material tray flange (15).

3. The hot pressing bag equipment for packaging bags according to claim 1, characterized in that: The cutting and rolling mechanism further comprises a mounting shaft (271) for mounting a cutting knife (27); the cutting knife (27) is fixedly mounted at the midpoint of the mounting shaft (271); and the mounting shaft (271) is coaxially rotatably connected to cutting rollers (272) on both sides of the cutting knife (27).

4. The hot pressing bag equipment for packaging bags according to claim 1, characterized in that: The cutting end of the cutter (27) is embedded and bolted with a blade (273).

5. The hot pressing bag equipment for packaging bags according to claim 1, characterized in that: The unloading mechanism comprises an unloading frame (61), two conveyor belt rollers (62) rotatably connected to the unloading frame (61), a conveyor belt (63) wound around the two conveyor belt rollers (62), and an unloading motor (64) for driving one of the conveyor belt rollers (62).

6. The hot pressing bag equipment for packaging bags according to claim 5, characterized in that: Heat-sealing sleeves (51) are respectively arranged on both sides of the unloading frame (61); the heat-sealing mechanism comprises two heat-sealing sliding columns (52) that are slidably matched with the heat-sealing sliding sleeves (51); a heat-sealing crossbeam (53) that is respectively fixed to the heat-sealing sliding columns (52) at both ends; a heat-pressing seat (54) that is longitudinally slidably connected to the heat-sealing crossbeam (53); and a PTC heating strip (55) that is arranged on the heat-pressing seat (54); the heat-pressing seat (54) has a limiting pressing plate (56) connected to the sliding column, and the limiting pressing plate (56) has a long groove (57) for the PTC heating strip (55) to pass through.

7. The hot pressing bag equipment for packaging bags according to claim 6, characterized in that: A cutting sleeve (58) is provided on both sides of the unloading frame (61), and the cutting mechanism comprises two cutting slide columns (591) slidably matched with the cutting slide columns (58), a cutting beam (592) fixed to the cutting slide columns (591) at both ends, a hot cutting seat (593) longitudinally adjustably mounted on the cutting beam (592), and a tungsten steel hot cutting knife (594) arranged on the hot cutting seat (593).

8. The hot pressing bag equipment for packaging bags according to claim 7, characterized in that: The crankshaft transmission mechanism comprises a connecting frame (595) for simultaneously fixing two heat-sealing sliding columns (52) and two cutting sliding columns (591), a shaft (596) hinged to the connecting frame (595), and a crankshaft (597) driven by an AC motor (598), wherein the bottom end of the shaft (596) is rotatably sleeved with the crankshaft (597).

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